LCOV - code coverage report
Current view: top level - include/linux - fs.h (source / functions) Hit Total Coverage
Test: landlock.info Lines: 269 344 78.2 %
Date: 2021-04-22 12:43:58 Functions: 30 35 85.7 %

          Line data    Source code
       1             : /* SPDX-License-Identifier: GPL-2.0 */
       2             : #ifndef _LINUX_FS_H
       3             : #define _LINUX_FS_H
       4             : 
       5             : #include <linux/linkage.h>
       6             : #include <linux/wait_bit.h>
       7             : #include <linux/kdev_t.h>
       8             : #include <linux/dcache.h>
       9             : #include <linux/path.h>
      10             : #include <linux/stat.h>
      11             : #include <linux/cache.h>
      12             : #include <linux/list.h>
      13             : #include <linux/list_lru.h>
      14             : #include <linux/llist.h>
      15             : #include <linux/radix-tree.h>
      16             : #include <linux/xarray.h>
      17             : #include <linux/rbtree.h>
      18             : #include <linux/init.h>
      19             : #include <linux/pid.h>
      20             : #include <linux/bug.h>
      21             : #include <linux/mutex.h>
      22             : #include <linux/rwsem.h>
      23             : #include <linux/mm_types.h>
      24             : #include <linux/capability.h>
      25             : #include <linux/semaphore.h>
      26             : #include <linux/fcntl.h>
      27             : #include <linux/rculist_bl.h>
      28             : #include <linux/atomic.h>
      29             : #include <linux/shrinker.h>
      30             : #include <linux/migrate_mode.h>
      31             : #include <linux/uidgid.h>
      32             : #include <linux/lockdep.h>
      33             : #include <linux/percpu-rwsem.h>
      34             : #include <linux/workqueue.h>
      35             : #include <linux/delayed_call.h>
      36             : #include <linux/uuid.h>
      37             : #include <linux/errseq.h>
      38             : #include <linux/ioprio.h>
      39             : #include <linux/fs_types.h>
      40             : #include <linux/build_bug.h>
      41             : #include <linux/stddef.h>
      42             : #include <linux/mount.h>
      43             : #include <linux/cred.h>
      44             : 
      45             : #include <asm/byteorder.h>
      46             : #include <uapi/linux/fs.h>
      47             : 
      48             : struct backing_dev_info;
      49             : struct bdi_writeback;
      50             : struct bio;
      51             : struct export_operations;
      52             : struct fiemap_extent_info;
      53             : struct hd_geometry;
      54             : struct iovec;
      55             : struct kiocb;
      56             : struct kobject;
      57             : struct pipe_inode_info;
      58             : struct poll_table_struct;
      59             : struct kstatfs;
      60             : struct vm_area_struct;
      61             : struct vfsmount;
      62             : struct cred;
      63             : struct swap_info_struct;
      64             : struct seq_file;
      65             : struct workqueue_struct;
      66             : struct iov_iter;
      67             : struct fscrypt_info;
      68             : struct fscrypt_operations;
      69             : struct fsverity_info;
      70             : struct fsverity_operations;
      71             : struct fs_context;
      72             : struct fs_parameter_spec;
      73             : 
      74             : extern void __init inode_init(void);
      75             : extern void __init inode_init_early(void);
      76             : extern void __init files_init(void);
      77             : extern void __init files_maxfiles_init(void);
      78             : 
      79             : extern struct files_stat_struct files_stat;
      80             : extern unsigned long get_max_files(void);
      81             : extern unsigned int sysctl_nr_open;
      82             : extern struct inodes_stat_t inodes_stat;
      83             : extern int leases_enable, lease_break_time;
      84             : extern int sysctl_protected_symlinks;
      85             : extern int sysctl_protected_hardlinks;
      86             : extern int sysctl_protected_fifos;
      87             : extern int sysctl_protected_regular;
      88             : 
      89             : typedef __kernel_rwf_t rwf_t;
      90             : 
      91             : struct buffer_head;
      92             : typedef int (get_block_t)(struct inode *inode, sector_t iblock,
      93             :                         struct buffer_head *bh_result, int create);
      94             : typedef int (dio_iodone_t)(struct kiocb *iocb, loff_t offset,
      95             :                         ssize_t bytes, void *private);
      96             : 
      97             : #define MAY_EXEC                0x00000001
      98             : #define MAY_WRITE               0x00000002
      99             : #define MAY_READ                0x00000004
     100             : #define MAY_APPEND              0x00000008
     101             : #define MAY_ACCESS              0x00000010
     102             : #define MAY_OPEN                0x00000020
     103             : #define MAY_CHDIR               0x00000040
     104             : /* called from RCU mode, don't block */
     105             : #define MAY_NOT_BLOCK           0x00000080
     106             : 
     107             : /*
     108             :  * flags in file.f_mode.  Note that FMODE_READ and FMODE_WRITE must correspond
     109             :  * to O_WRONLY and O_RDWR via the strange trick in do_dentry_open()
     110             :  */
     111             : 
     112             : /* file is open for reading */
     113             : #define FMODE_READ              ((__force fmode_t)0x1)
     114             : /* file is open for writing */
     115             : #define FMODE_WRITE             ((__force fmode_t)0x2)
     116             : /* file is seekable */
     117             : #define FMODE_LSEEK             ((__force fmode_t)0x4)
     118             : /* file can be accessed using pread */
     119             : #define FMODE_PREAD             ((__force fmode_t)0x8)
     120             : /* file can be accessed using pwrite */
     121             : #define FMODE_PWRITE            ((__force fmode_t)0x10)
     122             : /* File is opened for execution with sys_execve / sys_uselib */
     123             : #define FMODE_EXEC              ((__force fmode_t)0x20)
     124             : /* File is opened with O_NDELAY (only set for block devices) */
     125             : #define FMODE_NDELAY            ((__force fmode_t)0x40)
     126             : /* File is opened with O_EXCL (only set for block devices) */
     127             : #define FMODE_EXCL              ((__force fmode_t)0x80)
     128             : /* File is opened using open(.., 3, ..) and is writeable only for ioctls
     129             :    (specialy hack for floppy.c) */
     130             : #define FMODE_WRITE_IOCTL       ((__force fmode_t)0x100)
     131             : /* 32bit hashes as llseek() offset (for directories) */
     132             : #define FMODE_32BITHASH         ((__force fmode_t)0x200)
     133             : /* 64bit hashes as llseek() offset (for directories) */
     134             : #define FMODE_64BITHASH         ((__force fmode_t)0x400)
     135             : 
     136             : /*
     137             :  * Don't update ctime and mtime.
     138             :  *
     139             :  * Currently a special hack for the XFS open_by_handle ioctl, but we'll
     140             :  * hopefully graduate it to a proper O_CMTIME flag supported by open(2) soon.
     141             :  */
     142             : #define FMODE_NOCMTIME          ((__force fmode_t)0x800)
     143             : 
     144             : /* Expect random access pattern */
     145             : #define FMODE_RANDOM            ((__force fmode_t)0x1000)
     146             : 
     147             : /* File is huge (eg. /dev/kmem): treat loff_t as unsigned */
     148             : #define FMODE_UNSIGNED_OFFSET   ((__force fmode_t)0x2000)
     149             : 
     150             : /* File is opened with O_PATH; almost nothing can be done with it */
     151             : #define FMODE_PATH              ((__force fmode_t)0x4000)
     152             : 
     153             : /* File needs atomic accesses to f_pos */
     154             : #define FMODE_ATOMIC_POS        ((__force fmode_t)0x8000)
     155             : /* Write access to underlying fs */
     156             : #define FMODE_WRITER            ((__force fmode_t)0x10000)
     157             : /* Has read method(s) */
     158             : #define FMODE_CAN_READ          ((__force fmode_t)0x20000)
     159             : /* Has write method(s) */
     160             : #define FMODE_CAN_WRITE         ((__force fmode_t)0x40000)
     161             : 
     162             : #define FMODE_OPENED            ((__force fmode_t)0x80000)
     163             : #define FMODE_CREATED           ((__force fmode_t)0x100000)
     164             : 
     165             : /* File is stream-like */
     166             : #define FMODE_STREAM            ((__force fmode_t)0x200000)
     167             : 
     168             : /* File was opened by fanotify and shouldn't generate fanotify events */
     169             : #define FMODE_NONOTIFY          ((__force fmode_t)0x4000000)
     170             : 
     171             : /* File is capable of returning -EAGAIN if I/O will block */
     172             : #define FMODE_NOWAIT            ((__force fmode_t)0x8000000)
     173             : 
     174             : /* File represents mount that needs unmounting */
     175             : #define FMODE_NEED_UNMOUNT      ((__force fmode_t)0x10000000)
     176             : 
     177             : /* File does not contribute to nr_files count */
     178             : #define FMODE_NOACCOUNT         ((__force fmode_t)0x20000000)
     179             : 
     180             : /* File supports async buffered reads */
     181             : #define FMODE_BUF_RASYNC        ((__force fmode_t)0x40000000)
     182             : 
     183             : /*
     184             :  * Attribute flags.  These should be or-ed together to figure out what
     185             :  * has been changed!
     186             :  */
     187             : #define ATTR_MODE       (1 << 0)
     188             : #define ATTR_UID        (1 << 1)
     189             : #define ATTR_GID        (1 << 2)
     190             : #define ATTR_SIZE       (1 << 3)
     191             : #define ATTR_ATIME      (1 << 4)
     192             : #define ATTR_MTIME      (1 << 5)
     193             : #define ATTR_CTIME      (1 << 6)
     194             : #define ATTR_ATIME_SET  (1 << 7)
     195             : #define ATTR_MTIME_SET  (1 << 8)
     196             : #define ATTR_FORCE      (1 << 9) /* Not a change, but a change it */
     197             : #define ATTR_KILL_SUID  (1 << 11)
     198             : #define ATTR_KILL_SGID  (1 << 12)
     199             : #define ATTR_FILE       (1 << 13)
     200             : #define ATTR_KILL_PRIV  (1 << 14)
     201             : #define ATTR_OPEN       (1 << 15) /* Truncating from open(O_TRUNC) */
     202             : #define ATTR_TIMES_SET  (1 << 16)
     203             : #define ATTR_TOUCH      (1 << 17)
     204             : 
     205             : /*
     206             :  * Whiteout is represented by a char device.  The following constants define the
     207             :  * mode and device number to use.
     208             :  */
     209             : #define WHITEOUT_MODE 0
     210             : #define WHITEOUT_DEV 0
     211             : 
     212             : /*
     213             :  * This is the Inode Attributes structure, used for notify_change().  It
     214             :  * uses the above definitions as flags, to know which values have changed.
     215             :  * Also, in this manner, a Filesystem can look at only the values it cares
     216             :  * about.  Basically, these are the attributes that the VFS layer can
     217             :  * request to change from the FS layer.
     218             :  *
     219             :  * Derek Atkins <warlord@MIT.EDU> 94-10-20
     220             :  */
     221             : struct iattr {
     222             :         unsigned int    ia_valid;
     223             :         umode_t         ia_mode;
     224             :         kuid_t          ia_uid;
     225             :         kgid_t          ia_gid;
     226             :         loff_t          ia_size;
     227             :         struct timespec64 ia_atime;
     228             :         struct timespec64 ia_mtime;
     229             :         struct timespec64 ia_ctime;
     230             : 
     231             :         /*
     232             :          * Not an attribute, but an auxiliary info for filesystems wanting to
     233             :          * implement an ftruncate() like method.  NOTE: filesystem should
     234             :          * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL).
     235             :          */
     236             :         struct file     *ia_file;
     237             : };
     238             : 
     239             : /*
     240             :  * Includes for diskquotas.
     241             :  */
     242             : #include <linux/quota.h>
     243             : 
     244             : /*
     245             :  * Maximum number of layers of fs stack.  Needs to be limited to
     246             :  * prevent kernel stack overflow
     247             :  */
     248             : #define FILESYSTEM_MAX_STACK_DEPTH 2
     249             : 
     250             : /** 
     251             :  * enum positive_aop_returns - aop return codes with specific semantics
     252             :  *
     253             :  * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has
     254             :  *                          completed, that the page is still locked, and
     255             :  *                          should be considered active.  The VM uses this hint
     256             :  *                          to return the page to the active list -- it won't
     257             :  *                          be a candidate for writeback again in the near
     258             :  *                          future.  Other callers must be careful to unlock
     259             :  *                          the page if they get this return.  Returned by
     260             :  *                          writepage(); 
     261             :  *
     262             :  * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has
     263             :  *                      unlocked it and the page might have been truncated.
     264             :  *                      The caller should back up to acquiring a new page and
     265             :  *                      trying again.  The aop will be taking reasonable
     266             :  *                      precautions not to livelock.  If the caller held a page
     267             :  *                      reference, it should drop it before retrying.  Returned
     268             :  *                      by readpage().
     269             :  *
     270             :  * address_space_operation functions return these large constants to indicate
     271             :  * special semantics to the caller.  These are much larger than the bytes in a
     272             :  * page to allow for functions that return the number of bytes operated on in a
     273             :  * given page.
     274             :  */
     275             : 
     276             : enum positive_aop_returns {
     277             :         AOP_WRITEPAGE_ACTIVATE  = 0x80000,
     278             :         AOP_TRUNCATED_PAGE      = 0x80001,
     279             : };
     280             : 
     281             : #define AOP_FLAG_CONT_EXPAND            0x0001 /* called from cont_expand */
     282             : #define AOP_FLAG_NOFS                   0x0002 /* used by filesystem to direct
     283             :                                                 * helper code (eg buffer layer)
     284             :                                                 * to clear GFP_FS from alloc */
     285             : 
     286             : /*
     287             :  * oh the beauties of C type declarations.
     288             :  */
     289             : struct page;
     290             : struct address_space;
     291             : struct writeback_control;
     292             : struct readahead_control;
     293             : 
     294             : /*
     295             :  * Write life time hint values.
     296             :  * Stored in struct inode as u8.
     297             :  */
     298             : enum rw_hint {
     299             :         WRITE_LIFE_NOT_SET      = 0,
     300             :         WRITE_LIFE_NONE         = RWH_WRITE_LIFE_NONE,
     301             :         WRITE_LIFE_SHORT        = RWH_WRITE_LIFE_SHORT,
     302             :         WRITE_LIFE_MEDIUM       = RWH_WRITE_LIFE_MEDIUM,
     303             :         WRITE_LIFE_LONG         = RWH_WRITE_LIFE_LONG,
     304             :         WRITE_LIFE_EXTREME      = RWH_WRITE_LIFE_EXTREME,
     305             : };
     306             : 
     307             : /* Match RWF_* bits to IOCB bits */
     308             : #define IOCB_HIPRI              (__force int) RWF_HIPRI
     309             : #define IOCB_DSYNC              (__force int) RWF_DSYNC
     310             : #define IOCB_SYNC               (__force int) RWF_SYNC
     311             : #define IOCB_NOWAIT             (__force int) RWF_NOWAIT
     312             : #define IOCB_APPEND             (__force int) RWF_APPEND
     313             : 
     314             : /* non-RWF related bits - start at 16 */
     315             : #define IOCB_EVENTFD            (1 << 16)
     316             : #define IOCB_DIRECT             (1 << 17)
     317             : #define IOCB_WRITE              (1 << 18)
     318             : /* iocb->ki_waitq is valid */
     319             : #define IOCB_WAITQ              (1 << 19)
     320             : #define IOCB_NOIO               (1 << 20)
     321             : 
     322             : struct kiocb {
     323             :         struct file             *ki_filp;
     324             : 
     325             :         /* The 'ki_filp' pointer is shared in a union for aio */
     326             :         randomized_struct_fields_start
     327             : 
     328             :         loff_t                  ki_pos;
     329             :         void (*ki_complete)(struct kiocb *iocb, long ret, long ret2);
     330             :         void                    *private;
     331             :         int                     ki_flags;
     332             :         u16                     ki_hint;
     333             :         u16                     ki_ioprio; /* See linux/ioprio.h */
     334             :         union {
     335             :                 unsigned int            ki_cookie; /* for ->iopoll */
     336             :                 struct wait_page_queue  *ki_waitq; /* for async buffered IO */
     337             :         };
     338             : 
     339             :         randomized_struct_fields_end
     340             : };
     341             : 
     342           0 : static inline bool is_sync_kiocb(struct kiocb *kiocb)
     343             : {
     344           0 :         return kiocb->ki_complete == NULL;
     345             : }
     346             : 
     347             : /*
     348             :  * "descriptor" for what we're up to with a read.
     349             :  * This allows us to use the same read code yet
     350             :  * have multiple different users of the data that
     351             :  * we read from a file.
     352             :  *
     353             :  * The simplest case just copies the data to user
     354             :  * mode.
     355             :  */
     356             : typedef struct {
     357             :         size_t written;
     358             :         size_t count;
     359             :         union {
     360             :                 char __user *buf;
     361             :                 void *data;
     362             :         } arg;
     363             :         int error;
     364             : } read_descriptor_t;
     365             : 
     366             : typedef int (*read_actor_t)(read_descriptor_t *, struct page *,
     367             :                 unsigned long, unsigned long);
     368             : 
     369             : struct address_space_operations {
     370             :         int (*writepage)(struct page *page, struct writeback_control *wbc);
     371             :         int (*readpage)(struct file *, struct page *);
     372             : 
     373             :         /* Write back some dirty pages from this mapping. */
     374             :         int (*writepages)(struct address_space *, struct writeback_control *);
     375             : 
     376             :         /* Set a page dirty.  Return true if this dirtied it */
     377             :         int (*set_page_dirty)(struct page *page);
     378             : 
     379             :         /*
     380             :          * Reads in the requested pages. Unlike ->readpage(), this is
     381             :          * PURELY used for read-ahead!.
     382             :          */
     383             :         int (*readpages)(struct file *filp, struct address_space *mapping,
     384             :                         struct list_head *pages, unsigned nr_pages);
     385             :         void (*readahead)(struct readahead_control *);
     386             : 
     387             :         int (*write_begin)(struct file *, struct address_space *mapping,
     388             :                                 loff_t pos, unsigned len, unsigned flags,
     389             :                                 struct page **pagep, void **fsdata);
     390             :         int (*write_end)(struct file *, struct address_space *mapping,
     391             :                                 loff_t pos, unsigned len, unsigned copied,
     392             :                                 struct page *page, void *fsdata);
     393             : 
     394             :         /* Unfortunately this kludge is needed for FIBMAP. Don't use it */
     395             :         sector_t (*bmap)(struct address_space *, sector_t);
     396             :         void (*invalidatepage) (struct page *, unsigned int, unsigned int);
     397             :         int (*releasepage) (struct page *, gfp_t);
     398             :         void (*freepage)(struct page *);
     399             :         ssize_t (*direct_IO)(struct kiocb *, struct iov_iter *iter);
     400             :         /*
     401             :          * migrate the contents of a page to the specified target. If
     402             :          * migrate_mode is MIGRATE_ASYNC, it must not block.
     403             :          */
     404             :         int (*migratepage) (struct address_space *,
     405             :                         struct page *, struct page *, enum migrate_mode);
     406             :         bool (*isolate_page)(struct page *, isolate_mode_t);
     407             :         void (*putback_page)(struct page *);
     408             :         int (*launder_page) (struct page *);
     409             :         int (*is_partially_uptodate) (struct page *, unsigned long,
     410             :                                         unsigned long);
     411             :         void (*is_dirty_writeback) (struct page *, bool *, bool *);
     412             :         int (*error_remove_page)(struct address_space *, struct page *);
     413             : 
     414             :         /* swapfile support */
     415             :         int (*swap_activate)(struct swap_info_struct *sis, struct file *file,
     416             :                                 sector_t *span);
     417             :         void (*swap_deactivate)(struct file *file);
     418             : };
     419             : 
     420             : extern const struct address_space_operations empty_aops;
     421             : 
     422             : /*
     423             :  * pagecache_write_begin/pagecache_write_end must be used by general code
     424             :  * to write into the pagecache.
     425             :  */
     426             : int pagecache_write_begin(struct file *, struct address_space *mapping,
     427             :                                 loff_t pos, unsigned len, unsigned flags,
     428             :                                 struct page **pagep, void **fsdata);
     429             : 
     430             : int pagecache_write_end(struct file *, struct address_space *mapping,
     431             :                                 loff_t pos, unsigned len, unsigned copied,
     432             :                                 struct page *page, void *fsdata);
     433             : 
     434             : /**
     435             :  * struct address_space - Contents of a cacheable, mappable object.
     436             :  * @host: Owner, either the inode or the block_device.
     437             :  * @i_pages: Cached pages.
     438             :  * @gfp_mask: Memory allocation flags to use for allocating pages.
     439             :  * @i_mmap_writable: Number of VM_SHARED mappings.
     440             :  * @nr_thps: Number of THPs in the pagecache (non-shmem only).
     441             :  * @i_mmap: Tree of private and shared mappings.
     442             :  * @i_mmap_rwsem: Protects @i_mmap and @i_mmap_writable.
     443             :  * @nrpages: Number of page entries, protected by the i_pages lock.
     444             :  * @nrexceptional: Shadow or DAX entries, protected by the i_pages lock.
     445             :  * @writeback_index: Writeback starts here.
     446             :  * @a_ops: Methods.
     447             :  * @flags: Error bits and flags (AS_*).
     448             :  * @wb_err: The most recent error which has occurred.
     449             :  * @private_lock: For use by the owner of the address_space.
     450             :  * @private_list: For use by the owner of the address_space.
     451             :  * @private_data: For use by the owner of the address_space.
     452             :  */
     453             : struct address_space {
     454             :         struct inode            *host;
     455             :         struct xarray           i_pages;
     456             :         gfp_t                   gfp_mask;
     457             :         atomic_t                i_mmap_writable;
     458             : #ifdef CONFIG_READ_ONLY_THP_FOR_FS
     459             :         /* number of thp, only for non-shmem files */
     460             :         atomic_t                nr_thps;
     461             : #endif
     462             :         struct rb_root_cached   i_mmap;
     463             :         struct rw_semaphore     i_mmap_rwsem;
     464             :         unsigned long           nrpages;
     465             :         unsigned long           nrexceptional;
     466             :         pgoff_t                 writeback_index;
     467             :         const struct address_space_operations *a_ops;
     468             :         unsigned long           flags;
     469             :         errseq_t                wb_err;
     470             :         spinlock_t              private_lock;
     471             :         struct list_head        private_list;
     472             :         void                    *private_data;
     473             : } __attribute__((aligned(sizeof(long)))) __randomize_layout;
     474             :         /*
     475             :          * On most architectures that alignment is already the case; but
     476             :          * must be enforced here for CRIS, to let the least significant bit
     477             :          * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON.
     478             :          */
     479             : 
     480             : /* XArray tags, for tagging dirty and writeback pages in the pagecache. */
     481             : #define PAGECACHE_TAG_DIRTY     XA_MARK_0
     482             : #define PAGECACHE_TAG_WRITEBACK XA_MARK_1
     483             : #define PAGECACHE_TAG_TOWRITE   XA_MARK_2
     484             : 
     485             : /*
     486             :  * Returns true if any of the pages in the mapping are marked with the tag.
     487             :  */
     488        7772 : static inline bool mapping_tagged(struct address_space *mapping, xa_mark_t tag)
     489             : {
     490        7772 :         return xa_marked(&mapping->i_pages, tag);
     491             : }
     492             : 
     493      180335 : static inline void i_mmap_lock_write(struct address_space *mapping)
     494             : {
     495      180335 :         down_write(&mapping->i_mmap_rwsem);
     496       22637 : }
     497             : 
     498             : static inline int i_mmap_trylock_write(struct address_space *mapping)
     499             : {
     500             :         return down_write_trylock(&mapping->i_mmap_rwsem);
     501             : }
     502             : 
     503      180338 : static inline void i_mmap_unlock_write(struct address_space *mapping)
     504             : {
     505      180338 :         up_write(&mapping->i_mmap_rwsem);
     506      152967 : }
     507             : 
     508          68 : static inline void i_mmap_lock_read(struct address_space *mapping)
     509             : {
     510          68 :         down_read(&mapping->i_mmap_rwsem);
     511          68 : }
     512             : 
     513          68 : static inline void i_mmap_unlock_read(struct address_space *mapping)
     514             : {
     515          68 :         up_read(&mapping->i_mmap_rwsem);
     516          68 : }
     517             : 
     518             : static inline void i_mmap_assert_locked(struct address_space *mapping)
     519             : {
     520             :         lockdep_assert_held(&mapping->i_mmap_rwsem);
     521             : }
     522             : 
     523             : static inline void i_mmap_assert_write_locked(struct address_space *mapping)
     524             : {
     525             :         lockdep_assert_held_write(&mapping->i_mmap_rwsem);
     526             : }
     527             : 
     528             : /*
     529             :  * Might pages of this file be mapped into userspace?
     530             :  */
     531             : static inline int mapping_mapped(struct address_space *mapping)
     532             : {
     533             :         return  !RB_EMPTY_ROOT(&mapping->i_mmap.rb_root);
     534             : }
     535             : 
     536             : /*
     537             :  * Might pages of this file have been modified in userspace?
     538             :  * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap
     539             :  * marks vma as VM_SHARED if it is shared, and the file was opened for
     540             :  * writing i.e. vma may be mprotected writable even if now readonly.
     541             :  *
     542             :  * If i_mmap_writable is negative, no new writable mappings are allowed. You
     543             :  * can only deny writable mappings, if none exists right now.
     544             :  */
     545         187 : static inline int mapping_writably_mapped(struct address_space *mapping)
     546             : {
     547         187 :         return atomic_read(&mapping->i_mmap_writable) > 0;
     548             : }
     549             : 
     550         139 : static inline int mapping_map_writable(struct address_space *mapping)
     551             : {
     552         139 :         return atomic_inc_unless_negative(&mapping->i_mmap_writable) ?
     553         139 :                 0 : -EPERM;
     554             : }
     555             : 
     556         398 : static inline void mapping_unmap_writable(struct address_space *mapping)
     557             : {
     558         398 :         atomic_dec(&mapping->i_mmap_writable);
     559         398 : }
     560             : 
     561           0 : static inline int mapping_deny_writable(struct address_space *mapping)
     562             : {
     563           0 :         return atomic_dec_unless_positive(&mapping->i_mmap_writable) ?
     564           0 :                 0 : -EBUSY;
     565             : }
     566             : 
     567         262 : static inline void mapping_allow_writable(struct address_space *mapping)
     568             : {
     569         262 :         atomic_inc(&mapping->i_mmap_writable);
     570         262 : }
     571             : 
     572             : /*
     573             :  * Use sequence counter to get consistent i_size on 32-bit processors.
     574             :  */
     575             : #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
     576             : #include <linux/seqlock.h>
     577             : #define __NEED_I_SIZE_ORDERED
     578             : #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount)
     579             : #else
     580             : #define i_size_ordered_init(inode) do { } while (0)
     581             : #endif
     582             : 
     583             : struct posix_acl;
     584             : #define ACL_NOT_CACHED ((void *)(-1))
     585             : #define ACL_DONT_CACHE ((void *)(-3))
     586             : 
     587             : static inline struct posix_acl *
     588             : uncached_acl_sentinel(struct task_struct *task)
     589             : {
     590             :         return (void *)task + 1;
     591             : }
     592             : 
     593             : static inline bool
     594             : is_uncached_acl(struct posix_acl *acl)
     595             : {
     596             :         return (long)acl & 1;
     597             : }
     598             : 
     599             : #define IOP_FASTPERM    0x0001
     600             : #define IOP_LOOKUP      0x0002
     601             : #define IOP_NOFOLLOW    0x0004
     602             : #define IOP_XATTR       0x0008
     603             : #define IOP_DEFAULT_READLINK    0x0010
     604             : 
     605             : struct fsnotify_mark_connector;
     606             : 
     607             : /*
     608             :  * Keep mostly read-only and often accessed (especially for
     609             :  * the RCU path lookup and 'stat' data) fields at the beginning
     610             :  * of the 'struct inode'
     611             :  */
     612             : struct inode {
     613             :         umode_t                 i_mode;
     614             :         unsigned short          i_opflags;
     615             :         kuid_t                  i_uid;
     616             :         kgid_t                  i_gid;
     617             :         unsigned int            i_flags;
     618             : 
     619             : #ifdef CONFIG_FS_POSIX_ACL
     620             :         struct posix_acl        *i_acl;
     621             :         struct posix_acl        *i_default_acl;
     622             : #endif
     623             : 
     624             :         const struct inode_operations   *i_op;
     625             :         struct super_block      *i_sb;
     626             :         struct address_space    *i_mapping;
     627             : 
     628             : #ifdef CONFIG_SECURITY
     629             :         void                    *i_security;
     630             : #endif
     631             : 
     632             :         /* Stat data, not accessed from path walking */
     633             :         unsigned long           i_ino;
     634             :         /*
     635             :          * Filesystems may only read i_nlink directly.  They shall use the
     636             :          * following functions for modification:
     637             :          *
     638             :          *    (set|clear|inc|drop)_nlink
     639             :          *    inode_(inc|dec)_link_count
     640             :          */
     641             :         union {
     642             :                 const unsigned int i_nlink;
     643             :                 unsigned int __i_nlink;
     644             :         };
     645             :         dev_t                   i_rdev;
     646             :         loff_t                  i_size;
     647             :         struct timespec64       i_atime;
     648             :         struct timespec64       i_mtime;
     649             :         struct timespec64       i_ctime;
     650             :         spinlock_t              i_lock; /* i_blocks, i_bytes, maybe i_size */
     651             :         unsigned short          i_bytes;
     652             :         u8                      i_blkbits;
     653             :         u8                      i_write_hint;
     654             :         blkcnt_t                i_blocks;
     655             : 
     656             : #ifdef __NEED_I_SIZE_ORDERED
     657             :         seqcount_t              i_size_seqcount;
     658             : #endif
     659             : 
     660             :         /* Misc */
     661             :         unsigned long           i_state;
     662             :         struct rw_semaphore     i_rwsem;
     663             : 
     664             :         unsigned long           dirtied_when;   /* jiffies of first dirtying */
     665             :         unsigned long           dirtied_time_when;
     666             : 
     667             :         struct hlist_node       i_hash;
     668             :         struct list_head        i_io_list;      /* backing dev IO list */
     669             : #ifdef CONFIG_CGROUP_WRITEBACK
     670             :         struct bdi_writeback    *i_wb;          /* the associated cgroup wb */
     671             : 
     672             :         /* foreign inode detection, see wbc_detach_inode() */
     673             :         int                     i_wb_frn_winner;
     674             :         u16                     i_wb_frn_avg_time;
     675             :         u16                     i_wb_frn_history;
     676             : #endif
     677             :         struct list_head        i_lru;          /* inode LRU list */
     678             :         struct list_head        i_sb_list;
     679             :         struct list_head        i_wb_list;      /* backing dev writeback list */
     680             :         union {
     681             :                 struct hlist_head       i_dentry;
     682             :                 struct rcu_head         i_rcu;
     683             :         };
     684             :         atomic64_t              i_version;
     685             :         atomic64_t              i_sequence; /* see futex */
     686             :         atomic_t                i_count;
     687             :         atomic_t                i_dio_count;
     688             :         atomic_t                i_writecount;
     689             : #if defined(CONFIG_IMA) || defined(CONFIG_FILE_LOCKING)
     690             :         atomic_t                i_readcount; /* struct files open RO */
     691             : #endif
     692             :         union {
     693             :                 const struct file_operations    *i_fop; /* former ->i_op->default_file_ops */
     694             :                 void (*free_inode)(struct inode *);
     695             :         };
     696             :         struct file_lock_context        *i_flctx;
     697             :         struct address_space    i_data;
     698             :         struct list_head        i_devices;
     699             :         union {
     700             :                 struct pipe_inode_info  *i_pipe;
     701             :                 struct cdev             *i_cdev;
     702             :                 char                    *i_link;
     703             :                 unsigned                i_dir_seq;
     704             :         };
     705             : 
     706             :         __u32                   i_generation;
     707             : 
     708             : #ifdef CONFIG_FSNOTIFY
     709             :         __u32                   i_fsnotify_mask; /* all events this inode cares about */
     710             :         struct fsnotify_mark_connector __rcu    *i_fsnotify_marks;
     711             : #endif
     712             : 
     713             : #ifdef CONFIG_FS_ENCRYPTION
     714             :         struct fscrypt_info     *i_crypt_info;
     715             : #endif
     716             : 
     717             : #ifdef CONFIG_FS_VERITY
     718             :         struct fsverity_info    *i_verity_info;
     719             : #endif
     720             : 
     721             :         void                    *i_private; /* fs or device private pointer */
     722             : } __randomize_layout;
     723             : 
     724             : struct timespec64 timestamp_truncate(struct timespec64 t, struct inode *inode);
     725             : 
     726       49617 : static inline unsigned int i_blocksize(const struct inode *node)
     727             : {
     728       48468 :         return (1 << node->i_blkbits);
     729             : }
     730             : 
     731       10252 : static inline int inode_unhashed(struct inode *inode)
     732             : {
     733        4964 :         return hlist_unhashed(&inode->i_hash);
     734             : }
     735             : 
     736             : /*
     737             :  * __mark_inode_dirty expects inodes to be hashed.  Since we don't
     738             :  * want special inodes in the fileset inode space, we make them
     739             :  * appear hashed, but do not put on any lists.  hlist_del()
     740             :  * will work fine and require no locking.
     741             :  */
     742             : static inline void inode_fake_hash(struct inode *inode)
     743             : {
     744             :         hlist_add_fake(&inode->i_hash);
     745             : }
     746             : 
     747             : /*
     748             :  * inode->i_mutex nesting subclasses for the lock validator:
     749             :  *
     750             :  * 0: the object of the current VFS operation
     751             :  * 1: parent
     752             :  * 2: child/target
     753             :  * 3: xattr
     754             :  * 4: second non-directory
     755             :  * 5: second parent (when locking independent directories in rename)
     756             :  *
     757             :  * I_MUTEX_NONDIR2 is for certain operations (such as rename) which lock two
     758             :  * non-directories at once.
     759             :  *
     760             :  * The locking order between these classes is
     761             :  * parent[2] -> child -> grandchild -> normal -> xattr -> second non-directory
     762             :  */
     763             : enum inode_i_mutex_lock_class
     764             : {
     765             :         I_MUTEX_NORMAL,
     766             :         I_MUTEX_PARENT,
     767             :         I_MUTEX_CHILD,
     768             :         I_MUTEX_XATTR,
     769             :         I_MUTEX_NONDIR2,
     770             :         I_MUTEX_PARENT2,
     771             : };
     772             : 
     773       11690 : static inline void inode_lock(struct inode *inode)
     774             : {
     775       11690 :         down_write(&inode->i_rwsem);
     776        1385 : }
     777             : 
     778       18806 : static inline void inode_unlock(struct inode *inode)
     779             : {
     780       18806 :         up_write(&inode->i_rwsem);
     781        1774 : }
     782             : 
     783       15989 : static inline void inode_lock_shared(struct inode *inode)
     784             : {
     785       15989 :         down_read(&inode->i_rwsem);
     786        2720 : }
     787             : 
     788       17988 : static inline void inode_unlock_shared(struct inode *inode)
     789             : {
     790       17988 :         up_read(&inode->i_rwsem);
     791        4719 : }
     792             : 
     793           0 : static inline int inode_trylock(struct inode *inode)
     794             : {
     795           0 :         return down_write_trylock(&inode->i_rwsem);
     796             : }
     797             : 
     798           0 : static inline int inode_trylock_shared(struct inode *inode)
     799             : {
     800           0 :         return down_read_trylock(&inode->i_rwsem);
     801             : }
     802             : 
     803        6874 : static inline int inode_is_locked(struct inode *inode)
     804             : {
     805        6874 :         return rwsem_is_locked(&inode->i_rwsem);
     806             : }
     807             : 
     808        7115 : static inline void inode_lock_nested(struct inode *inode, unsigned subclass)
     809             : {
     810        7101 :         down_write_nested(&inode->i_rwsem, subclass);
     811         391 : }
     812             : 
     813             : static inline void inode_lock_shared_nested(struct inode *inode, unsigned subclass)
     814             : {
     815             :         down_read_nested(&inode->i_rwsem, subclass);
     816             : }
     817             : 
     818             : void lock_two_nondirectories(struct inode *, struct inode*);
     819             : void unlock_two_nondirectories(struct inode *, struct inode*);
     820             : 
     821             : /*
     822             :  * NOTE: in a 32bit arch with a preemptable kernel and
     823             :  * an UP compile the i_size_read/write must be atomic
     824             :  * with respect to the local cpu (unlike with preempt disabled),
     825             :  * but they don't need to be atomic with respect to other cpus like in
     826             :  * true SMP (so they need either to either locally disable irq around
     827             :  * the read or for example on x86 they can be still implemented as a
     828             :  * cmpxchg8b without the need of the lock prefix). For SMP compiles
     829             :  * and 64bit archs it makes no difference if preempt is enabled or not.
     830             :  */
     831      104294 : static inline loff_t i_size_read(const struct inode *inode)
     832             : {
     833             : #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
     834             :         loff_t i_size;
     835             :         unsigned int seq;
     836             : 
     837             :         do {
     838             :                 seq = read_seqcount_begin(&inode->i_size_seqcount);
     839             :                 i_size = inode->i_size;
     840             :         } while (read_seqcount_retry(&inode->i_size_seqcount, seq));
     841             :         return i_size;
     842             : #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPTION)
     843             :         loff_t i_size;
     844             : 
     845             :         preempt_disable();
     846             :         i_size = inode->i_size;
     847             :         preempt_enable();
     848             :         return i_size;
     849             : #else
     850      104290 :         return inode->i_size;
     851             : #endif
     852             : }
     853             : 
     854             : /*
     855             :  * NOTE: unlike i_size_read(), i_size_write() does need locking around it
     856             :  * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount
     857             :  * can be lost, resulting in subsequent i_size_read() calls spinning forever.
     858             :  */
     859        2742 : static inline void i_size_write(struct inode *inode, loff_t i_size)
     860             : {
     861             : #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
     862             :         preempt_disable();
     863             :         write_seqcount_begin(&inode->i_size_seqcount);
     864             :         inode->i_size = i_size;
     865             :         write_seqcount_end(&inode->i_size_seqcount);
     866             :         preempt_enable();
     867             : #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPTION)
     868             :         preempt_disable();
     869             :         inode->i_size = i_size;
     870             :         preempt_enable();
     871             : #else
     872        2029 :         inode->i_size = i_size;
     873             : #endif
     874         713 : }
     875             : 
     876         216 : static inline unsigned iminor(const struct inode *inode)
     877             : {
     878         216 :         return MINOR(inode->i_rdev);
     879             : }
     880             : 
     881           0 : static inline unsigned imajor(const struct inode *inode)
     882             : {
     883           0 :         return MAJOR(inode->i_rdev);
     884             : }
     885             : 
     886             : struct fown_struct {
     887             :         rwlock_t lock;          /* protects pid, uid, euid fields */
     888             :         struct pid *pid;        /* pid or -pgrp where SIGIO should be sent */
     889             :         enum pid_type pid_type; /* Kind of process group SIGIO should be sent to */
     890             :         kuid_t uid, euid;       /* uid/euid of process setting the owner */
     891             :         int signum;             /* posix.1b rt signal to be delivered on IO */
     892             : };
     893             : 
     894             : /*
     895             :  * Track a single file's readahead state
     896             :  */
     897             : struct file_ra_state {
     898             :         pgoff_t start;                  /* where readahead started */
     899             :         unsigned int size;              /* # of readahead pages */
     900             :         unsigned int async_size;        /* do asynchronous readahead when
     901             :                                            there are only # of pages ahead */
     902             : 
     903             :         unsigned int ra_pages;          /* Maximum readahead window */
     904             :         unsigned int mmap_miss;         /* Cache miss stat for mmap accesses */
     905             :         loff_t prev_pos;                /* Cache last read() position */
     906             : };
     907             : 
     908             : /*
     909             :  * Check if @index falls in the readahead windows.
     910             :  */
     911           0 : static inline int ra_has_index(struct file_ra_state *ra, pgoff_t index)
     912             : {
     913           0 :         return (index >= ra->start &&
     914           0 :                 index <  ra->start + ra->size);
     915             : }
     916             : 
     917             : struct file {
     918             :         union {
     919             :                 struct llist_node       fu_llist;
     920             :                 struct rcu_head         fu_rcuhead;
     921             :         } f_u;
     922             :         struct path             f_path;
     923             :         struct inode            *f_inode;       /* cached value */
     924             :         const struct file_operations    *f_op;
     925             : 
     926             :         /*
     927             :          * Protects f_ep, f_flags.
     928             :          * Must not be taken from IRQ context.
     929             :          */
     930             :         spinlock_t              f_lock;
     931             :         enum rw_hint            f_write_hint;
     932             :         atomic_long_t           f_count;
     933             :         unsigned int            f_flags;
     934             :         fmode_t                 f_mode;
     935             :         struct mutex            f_pos_lock;
     936             :         loff_t                  f_pos;
     937             :         struct fown_struct      f_owner;
     938             :         const struct cred       *f_cred;
     939             :         struct file_ra_state    f_ra;
     940             : 
     941             :         u64                     f_version;
     942             : #ifdef CONFIG_SECURITY
     943             :         void                    *f_security;
     944             : #endif
     945             :         /* needed for tty driver, and maybe others */
     946             :         void                    *private_data;
     947             : 
     948             : #ifdef CONFIG_EPOLL
     949             :         /* Used by fs/eventpoll.c to link all the hooks to this file */
     950             :         struct hlist_head       *f_ep;
     951             : #endif /* #ifdef CONFIG_EPOLL */
     952             :         struct address_space    *f_mapping;
     953             :         errseq_t                f_wb_err;
     954             :         errseq_t                f_sb_err; /* for syncfs */
     955             : } __randomize_layout
     956             :   __attribute__((aligned(4)));  /* lest something weird decides that 2 is OK */
     957             : 
     958             : struct file_handle {
     959             :         __u32 handle_bytes;
     960             :         int handle_type;
     961             :         /* file identifier */
     962             :         unsigned char f_handle[];
     963             : };
     964             : 
     965      101043 : static inline struct file *get_file(struct file *f)
     966             : {
     967      101043 :         atomic_long_inc(&f->f_count);
     968      101043 :         return f;
     969             : }
     970             : #define get_file_rcu_many(x, cnt)       \
     971             :         atomic_long_add_unless(&(x)->f_count, (cnt), 0)
     972             : #define get_file_rcu(x) get_file_rcu_many((x), 1)
     973             : #define file_count(x)   atomic_long_read(&(x)->f_count)
     974             : 
     975             : #define MAX_NON_LFS     ((1UL<<31) - 1)
     976             : 
     977             : /* Page cache limit. The filesystems should put that into their s_maxbytes 
     978             :    limits, otherwise bad things can happen in VM. */ 
     979             : #if BITS_PER_LONG==32
     980             : #define MAX_LFS_FILESIZE        ((loff_t)ULONG_MAX << PAGE_SHIFT)
     981             : #elif BITS_PER_LONG==64
     982             : #define MAX_LFS_FILESIZE        ((loff_t)LLONG_MAX)
     983             : #endif
     984             : 
     985             : #define FL_POSIX        1
     986             : #define FL_FLOCK        2
     987             : #define FL_DELEG        4       /* NFSv4 delegation */
     988             : #define FL_ACCESS       8       /* not trying to lock, just looking */
     989             : #define FL_EXISTS       16      /* when unlocking, test for existence */
     990             : #define FL_LEASE        32      /* lease held on this file */
     991             : #define FL_CLOSE        64      /* unlock on close */
     992             : #define FL_SLEEP        128     /* A blocking lock */
     993             : #define FL_DOWNGRADE_PENDING    256 /* Lease is being downgraded */
     994             : #define FL_UNLOCK_PENDING       512 /* Lease is being broken */
     995             : #define FL_OFDLCK       1024    /* lock is "owned" by struct file */
     996             : #define FL_LAYOUT       2048    /* outstanding pNFS layout */
     997             : 
     998             : #define FL_CLOSE_POSIX (FL_POSIX | FL_CLOSE)
     999             : 
    1000             : /*
    1001             :  * Special return value from posix_lock_file() and vfs_lock_file() for
    1002             :  * asynchronous locking.
    1003             :  */
    1004             : #define FILE_LOCK_DEFERRED 1
    1005             : 
    1006             : /* legacy typedef, should eventually be removed */
    1007             : typedef void *fl_owner_t;
    1008             : 
    1009             : struct file_lock;
    1010             : 
    1011             : struct file_lock_operations {
    1012             :         void (*fl_copy_lock)(struct file_lock *, struct file_lock *);
    1013             :         void (*fl_release_private)(struct file_lock *);
    1014             : };
    1015             : 
    1016             : struct lock_manager_operations {
    1017             :         fl_owner_t (*lm_get_owner)(fl_owner_t);
    1018             :         void (*lm_put_owner)(fl_owner_t);
    1019             :         void (*lm_notify)(struct file_lock *);  /* unblock callback */
    1020             :         int (*lm_grant)(struct file_lock *, int);
    1021             :         bool (*lm_break)(struct file_lock *);
    1022             :         int (*lm_change)(struct file_lock *, int, struct list_head *);
    1023             :         void (*lm_setup)(struct file_lock *, void **);
    1024             :         bool (*lm_breaker_owns_lease)(struct file_lock *);
    1025             : };
    1026             : 
    1027             : struct lock_manager {
    1028             :         struct list_head list;
    1029             :         /*
    1030             :          * NFSv4 and up also want opens blocked during the grace period;
    1031             :          * NLM doesn't care:
    1032             :          */
    1033             :         bool block_opens;
    1034             : };
    1035             : 
    1036             : struct net;
    1037             : void locks_start_grace(struct net *, struct lock_manager *);
    1038             : void locks_end_grace(struct lock_manager *);
    1039             : bool locks_in_grace(struct net *);
    1040             : bool opens_in_grace(struct net *);
    1041             : 
    1042             : /* that will die - we need it for nfs_lock_info */
    1043             : #include <linux/nfs_fs_i.h>
    1044             : 
    1045             : /*
    1046             :  * struct file_lock represents a generic "file lock". It's used to represent
    1047             :  * POSIX byte range locks, BSD (flock) locks, and leases. It's important to
    1048             :  * note that the same struct is used to represent both a request for a lock and
    1049             :  * the lock itself, but the same object is never used for both.
    1050             :  *
    1051             :  * FIXME: should we create a separate "struct lock_request" to help distinguish
    1052             :  * these two uses?
    1053             :  *
    1054             :  * The varous i_flctx lists are ordered by:
    1055             :  *
    1056             :  * 1) lock owner
    1057             :  * 2) lock range start
    1058             :  * 3) lock range end
    1059             :  *
    1060             :  * Obviously, the last two criteria only matter for POSIX locks.
    1061             :  */
    1062             : struct file_lock {
    1063             :         struct file_lock *fl_blocker;   /* The lock, that is blocking us */
    1064             :         struct list_head fl_list;       /* link into file_lock_context */
    1065             :         struct hlist_node fl_link;      /* node in global lists */
    1066             :         struct list_head fl_blocked_requests;   /* list of requests with
    1067             :                                                  * ->fl_blocker pointing here
    1068             :                                                  */
    1069             :         struct list_head fl_blocked_member;     /* node in
    1070             :                                                  * ->fl_blocker->fl_blocked_requests
    1071             :                                                  */
    1072             :         fl_owner_t fl_owner;
    1073             :         unsigned int fl_flags;
    1074             :         unsigned char fl_type;
    1075             :         unsigned int fl_pid;
    1076             :         int fl_link_cpu;                /* what cpu's list is this on? */
    1077             :         wait_queue_head_t fl_wait;
    1078             :         struct file *fl_file;
    1079             :         loff_t fl_start;
    1080             :         loff_t fl_end;
    1081             : 
    1082             :         struct fasync_struct *  fl_fasync; /* for lease break notifications */
    1083             :         /* for lease breaks: */
    1084             :         unsigned long fl_break_time;
    1085             :         unsigned long fl_downgrade_time;
    1086             : 
    1087             :         const struct file_lock_operations *fl_ops;      /* Callbacks for filesystems */
    1088             :         const struct lock_manager_operations *fl_lmops; /* Callbacks for lockmanagers */
    1089             :         union {
    1090             :                 struct nfs_lock_info    nfs_fl;
    1091             :                 struct nfs4_lock_info   nfs4_fl;
    1092             :                 struct {
    1093             :                         struct list_head link;  /* link in AFS vnode's pending_locks list */
    1094             :                         int state;              /* state of grant or error if -ve */
    1095             :                         unsigned int    debug_id;
    1096             :                 } afs;
    1097             :         } fl_u;
    1098             : } __randomize_layout;
    1099             : 
    1100             : struct file_lock_context {
    1101             :         spinlock_t              flc_lock;
    1102             :         struct list_head        flc_flock;
    1103             :         struct list_head        flc_posix;
    1104             :         struct list_head        flc_lease;
    1105             : };
    1106             : 
    1107             : /* The following constant reflects the upper bound of the file/locking space */
    1108             : #ifndef OFFSET_MAX
    1109             : #define INT_LIMIT(x)    (~((x)1 << (sizeof(x)*8 - 1)))
    1110             : #define OFFSET_MAX      INT_LIMIT(loff_t)
    1111             : #define OFFT_OFFSET_MAX INT_LIMIT(off_t)
    1112             : #endif
    1113             : 
    1114             : extern void send_sigio(struct fown_struct *fown, int fd, int band);
    1115             : 
    1116             : #define locks_inode(f) file_inode(f)
    1117             : 
    1118             : #ifdef CONFIG_FILE_LOCKING
    1119             : extern int fcntl_getlk(struct file *, unsigned int, struct flock *);
    1120             : extern int fcntl_setlk(unsigned int, struct file *, unsigned int,
    1121             :                         struct flock *);
    1122             : 
    1123             : #if BITS_PER_LONG == 32
    1124             : extern int fcntl_getlk64(struct file *, unsigned int, struct flock64 *);
    1125             : extern int fcntl_setlk64(unsigned int, struct file *, unsigned int,
    1126             :                         struct flock64 *);
    1127             : #endif
    1128             : 
    1129             : extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg);
    1130             : extern int fcntl_getlease(struct file *filp);
    1131             : 
    1132             : /* fs/locks.c */
    1133             : void locks_free_lock_context(struct inode *inode);
    1134             : void locks_free_lock(struct file_lock *fl);
    1135             : extern void locks_init_lock(struct file_lock *);
    1136             : extern struct file_lock * locks_alloc_lock(void);
    1137             : extern void locks_copy_lock(struct file_lock *, struct file_lock *);
    1138             : extern void locks_copy_conflock(struct file_lock *, struct file_lock *);
    1139             : extern void locks_remove_posix(struct file *, fl_owner_t);
    1140             : extern void locks_remove_file(struct file *);
    1141             : extern void locks_release_private(struct file_lock *);
    1142             : extern void posix_test_lock(struct file *, struct file_lock *);
    1143             : extern int posix_lock_file(struct file *, struct file_lock *, struct file_lock *);
    1144             : extern int locks_delete_block(struct file_lock *);
    1145             : extern int vfs_test_lock(struct file *, struct file_lock *);
    1146             : extern int vfs_lock_file(struct file *, unsigned int, struct file_lock *, struct file_lock *);
    1147             : extern int vfs_cancel_lock(struct file *filp, struct file_lock *fl);
    1148             : extern int locks_lock_inode_wait(struct inode *inode, struct file_lock *fl);
    1149             : extern int __break_lease(struct inode *inode, unsigned int flags, unsigned int type);
    1150             : extern void lease_get_mtime(struct inode *, struct timespec64 *time);
    1151             : extern int generic_setlease(struct file *, long, struct file_lock **, void **priv);
    1152             : extern int vfs_setlease(struct file *, long, struct file_lock **, void **);
    1153             : extern int lease_modify(struct file_lock *, int, struct list_head *);
    1154             : 
    1155             : struct notifier_block;
    1156             : extern int lease_register_notifier(struct notifier_block *);
    1157             : extern void lease_unregister_notifier(struct notifier_block *);
    1158             : 
    1159             : struct files_struct;
    1160             : extern void show_fd_locks(struct seq_file *f,
    1161             :                          struct file *filp, struct files_struct *files);
    1162             : #else /* !CONFIG_FILE_LOCKING */
    1163             : static inline int fcntl_getlk(struct file *file, unsigned int cmd,
    1164             :                               struct flock __user *user)
    1165             : {
    1166             :         return -EINVAL;
    1167             : }
    1168             : 
    1169             : static inline int fcntl_setlk(unsigned int fd, struct file *file,
    1170             :                               unsigned int cmd, struct flock __user *user)
    1171             : {
    1172             :         return -EACCES;
    1173             : }
    1174             : 
    1175             : #if BITS_PER_LONG == 32
    1176             : static inline int fcntl_getlk64(struct file *file, unsigned int cmd,
    1177             :                                 struct flock64 __user *user)
    1178             : {
    1179             :         return -EINVAL;
    1180             : }
    1181             : 
    1182             : static inline int fcntl_setlk64(unsigned int fd, struct file *file,
    1183             :                                 unsigned int cmd, struct flock64 __user *user)
    1184             : {
    1185             :         return -EACCES;
    1186             : }
    1187             : #endif
    1188             : static inline int fcntl_setlease(unsigned int fd, struct file *filp, long arg)
    1189             : {
    1190             :         return -EINVAL;
    1191             : }
    1192             : 
    1193             : static inline int fcntl_getlease(struct file *filp)
    1194             : {
    1195             :         return F_UNLCK;
    1196             : }
    1197             : 
    1198             : static inline void
    1199             : locks_free_lock_context(struct inode *inode)
    1200             : {
    1201             : }
    1202             : 
    1203             : static inline void locks_init_lock(struct file_lock *fl)
    1204             : {
    1205             :         return;
    1206             : }
    1207             : 
    1208             : static inline void locks_copy_conflock(struct file_lock *new, struct file_lock *fl)
    1209             : {
    1210             :         return;
    1211             : }
    1212             : 
    1213             : static inline void locks_copy_lock(struct file_lock *new, struct file_lock *fl)
    1214             : {
    1215             :         return;
    1216             : }
    1217             : 
    1218             : static inline void locks_remove_posix(struct file *filp, fl_owner_t owner)
    1219             : {
    1220             :         return;
    1221             : }
    1222             : 
    1223             : static inline void locks_remove_file(struct file *filp)
    1224             : {
    1225             :         return;
    1226             : }
    1227             : 
    1228             : static inline void posix_test_lock(struct file *filp, struct file_lock *fl)
    1229             : {
    1230             :         return;
    1231             : }
    1232             : 
    1233             : static inline int posix_lock_file(struct file *filp, struct file_lock *fl,
    1234             :                                   struct file_lock *conflock)
    1235             : {
    1236             :         return -ENOLCK;
    1237             : }
    1238             : 
    1239             : static inline int locks_delete_block(struct file_lock *waiter)
    1240             : {
    1241             :         return -ENOENT;
    1242             : }
    1243             : 
    1244             : static inline int vfs_test_lock(struct file *filp, struct file_lock *fl)
    1245             : {
    1246             :         return 0;
    1247             : }
    1248             : 
    1249             : static inline int vfs_lock_file(struct file *filp, unsigned int cmd,
    1250             :                                 struct file_lock *fl, struct file_lock *conf)
    1251             : {
    1252             :         return -ENOLCK;
    1253             : }
    1254             : 
    1255             : static inline int vfs_cancel_lock(struct file *filp, struct file_lock *fl)
    1256             : {
    1257             :         return 0;
    1258             : }
    1259             : 
    1260             : static inline int locks_lock_inode_wait(struct inode *inode, struct file_lock *fl)
    1261             : {
    1262             :         return -ENOLCK;
    1263             : }
    1264             : 
    1265             : static inline int __break_lease(struct inode *inode, unsigned int mode, unsigned int type)
    1266             : {
    1267             :         return 0;
    1268             : }
    1269             : 
    1270             : static inline void lease_get_mtime(struct inode *inode,
    1271             :                                    struct timespec64 *time)
    1272             : {
    1273             :         return;
    1274             : }
    1275             : 
    1276             : static inline int generic_setlease(struct file *filp, long arg,
    1277             :                                     struct file_lock **flp, void **priv)
    1278             : {
    1279             :         return -EINVAL;
    1280             : }
    1281             : 
    1282             : static inline int vfs_setlease(struct file *filp, long arg,
    1283             :                                struct file_lock **lease, void **priv)
    1284             : {
    1285             :         return -EINVAL;
    1286             : }
    1287             : 
    1288             : static inline int lease_modify(struct file_lock *fl, int arg,
    1289             :                                struct list_head *dispose)
    1290             : {
    1291             :         return -EINVAL;
    1292             : }
    1293             : 
    1294             : struct files_struct;
    1295             : static inline void show_fd_locks(struct seq_file *f,
    1296             :                         struct file *filp, struct files_struct *files) {}
    1297             : #endif /* !CONFIG_FILE_LOCKING */
    1298             : 
    1299      458429 : static inline struct inode *file_inode(const struct file *f)
    1300             : {
    1301      339848 :         return f->f_inode;
    1302             : }
    1303             : 
    1304        1629 : static inline struct dentry *file_dentry(const struct file *file)
    1305             : {
    1306        1629 :         return d_real(file->f_path.dentry, file_inode(file));
    1307             : }
    1308             : 
    1309         150 : static inline int locks_lock_file_wait(struct file *filp, struct file_lock *fl)
    1310             : {
    1311         150 :         return locks_lock_inode_wait(locks_inode(filp), fl);
    1312             : }
    1313             : 
    1314             : struct fasync_struct {
    1315             :         rwlock_t                fa_lock;
    1316             :         int                     magic;
    1317             :         int                     fa_fd;
    1318             :         struct fasync_struct    *fa_next; /* singly linked list */
    1319             :         struct file             *fa_file;
    1320             :         struct rcu_head         fa_rcu;
    1321             : };
    1322             : 
    1323             : #define FASYNC_MAGIC 0x4601
    1324             : 
    1325             : /* SMP safe fasync helpers: */
    1326             : extern int fasync_helper(int, struct file *, int, struct fasync_struct **);
    1327             : extern struct fasync_struct *fasync_insert_entry(int, struct file *, struct fasync_struct **, struct fasync_struct *);
    1328             : extern int fasync_remove_entry(struct file *, struct fasync_struct **);
    1329             : extern struct fasync_struct *fasync_alloc(void);
    1330             : extern void fasync_free(struct fasync_struct *);
    1331             : 
    1332             : /* can be called from interrupts */
    1333             : extern void kill_fasync(struct fasync_struct **, int, int);
    1334             : 
    1335             : extern void __f_setown(struct file *filp, struct pid *, enum pid_type, int force);
    1336             : extern int f_setown(struct file *filp, unsigned long arg, int force);
    1337             : extern void f_delown(struct file *filp);
    1338             : extern pid_t f_getown(struct file *filp);
    1339             : extern int send_sigurg(struct fown_struct *fown);
    1340             : 
    1341             : /*
    1342             :  * sb->s_flags.  Note that these mirror the equivalent MS_* flags where
    1343             :  * represented in both.
    1344             :  */
    1345             : #define SB_RDONLY        1      /* Mount read-only */
    1346             : #define SB_NOSUID        2      /* Ignore suid and sgid bits */
    1347             : #define SB_NODEV         4      /* Disallow access to device special files */
    1348             : #define SB_NOEXEC        8      /* Disallow program execution */
    1349             : #define SB_SYNCHRONOUS  16      /* Writes are synced at once */
    1350             : #define SB_MANDLOCK     64      /* Allow mandatory locks on an FS */
    1351             : #define SB_DIRSYNC      128     /* Directory modifications are synchronous */
    1352             : #define SB_NOATIME      1024    /* Do not update access times. */
    1353             : #define SB_NODIRATIME   2048    /* Do not update directory access times */
    1354             : #define SB_SILENT       32768
    1355             : #define SB_POSIXACL     (1<<16)   /* VFS does not apply the umask */
    1356             : #define SB_INLINECRYPT  (1<<17)   /* Use blk-crypto for encrypted files */
    1357             : #define SB_KERNMOUNT    (1<<22) /* this is a kern_mount call */
    1358             : #define SB_I_VERSION    (1<<23) /* Update inode I_version field */
    1359             : #define SB_LAZYTIME     (1<<25) /* Update the on-disk [acm]times lazily */
    1360             : 
    1361             : /* These sb flags are internal to the kernel */
    1362             : #define SB_SUBMOUNT     (1<<26)
    1363             : #define SB_FORCE        (1<<27)
    1364             : #define SB_NOSEC        (1<<28)
    1365             : #define SB_BORN         (1<<29)
    1366             : #define SB_ACTIVE       (1<<30)
    1367             : #define SB_NOUSER       (1<<31)
    1368             : 
    1369             : /* These flags relate to encoding and casefolding */
    1370             : #define SB_ENC_STRICT_MODE_FL   (1 << 0)
    1371             : 
    1372             : #define sb_has_strict_encoding(sb) \
    1373             :         (sb->s_encoding_flags & SB_ENC_STRICT_MODE_FL)
    1374             : 
    1375             : /*
    1376             :  *      Umount options
    1377             :  */
    1378             : 
    1379             : #define MNT_FORCE       0x00000001      /* Attempt to forcibily umount */
    1380             : #define MNT_DETACH      0x00000002      /* Just detach from the tree */
    1381             : #define MNT_EXPIRE      0x00000004      /* Mark for expiry */
    1382             : #define UMOUNT_NOFOLLOW 0x00000008      /* Don't follow symlink on umount */
    1383             : #define UMOUNT_UNUSED   0x80000000      /* Flag guaranteed to be unused */
    1384             : 
    1385             : /* sb->s_iflags */
    1386             : #define SB_I_CGROUPWB   0x00000001      /* cgroup-aware writeback enabled */
    1387             : #define SB_I_NOEXEC     0x00000002      /* Ignore executables on this fs */
    1388             : #define SB_I_NODEV      0x00000004      /* Ignore devices on this fs */
    1389             : #define SB_I_STABLE_WRITES 0x00000008   /* don't modify blks until WB is done */
    1390             : 
    1391             : /* sb->s_iflags to limit user namespace mounts */
    1392             : #define SB_I_USERNS_VISIBLE             0x00000010 /* fstype already mounted */
    1393             : #define SB_I_IMA_UNVERIFIABLE_SIGNATURE 0x00000020
    1394             : #define SB_I_UNTRUSTED_MOUNTER          0x00000040
    1395             : 
    1396             : #define SB_I_SKIP_SYNC  0x00000100      /* Skip superblock at global sync */
    1397             : 
    1398             : /* Possible states of 'frozen' field */
    1399             : enum {
    1400             :         SB_UNFROZEN = 0,                /* FS is unfrozen */
    1401             :         SB_FREEZE_WRITE = 1,            /* Writes, dir ops, ioctls frozen */
    1402             :         SB_FREEZE_PAGEFAULT = 2,        /* Page faults stopped as well */
    1403             :         SB_FREEZE_FS = 3,               /* For internal FS use (e.g. to stop
    1404             :                                          * internal threads if needed) */
    1405             :         SB_FREEZE_COMPLETE = 4,         /* ->freeze_fs finished successfully */
    1406             : };
    1407             : 
    1408             : #define SB_FREEZE_LEVELS (SB_FREEZE_COMPLETE - 1)
    1409             : 
    1410             : struct sb_writers {
    1411             :         int                             frozen;         /* Is sb frozen? */
    1412             :         wait_queue_head_t               wait_unfrozen;  /* wait for thaw */
    1413             :         struct percpu_rw_semaphore      rw_sem[SB_FREEZE_LEVELS];
    1414             : };
    1415             : 
    1416             : struct super_block {
    1417             :         struct list_head        s_list;         /* Keep this first */
    1418             :         dev_t                   s_dev;          /* search index; _not_ kdev_t */
    1419             :         unsigned char           s_blocksize_bits;
    1420             :         unsigned long           s_blocksize;
    1421             :         loff_t                  s_maxbytes;     /* Max file size */
    1422             :         struct file_system_type *s_type;
    1423             :         const struct super_operations   *s_op;
    1424             :         const struct dquot_operations   *dq_op;
    1425             :         const struct quotactl_ops       *s_qcop;
    1426             :         const struct export_operations *s_export_op;
    1427             :         unsigned long           s_flags;
    1428             :         unsigned long           s_iflags;       /* internal SB_I_* flags */
    1429             :         unsigned long           s_magic;
    1430             :         struct dentry           *s_root;
    1431             :         struct rw_semaphore     s_umount;
    1432             :         int                     s_count;
    1433             :         atomic_t                s_active;
    1434             : #ifdef CONFIG_SECURITY
    1435             :         void                    *s_security;
    1436             : #endif
    1437             :         const struct xattr_handler **s_xattr;
    1438             : #ifdef CONFIG_FS_ENCRYPTION
    1439             :         const struct fscrypt_operations *s_cop;
    1440             :         struct key              *s_master_keys; /* master crypto keys in use */
    1441             : #endif
    1442             : #ifdef CONFIG_FS_VERITY
    1443             :         const struct fsverity_operations *s_vop;
    1444             : #endif
    1445             : #ifdef CONFIG_UNICODE
    1446             :         struct unicode_map *s_encoding;
    1447             :         __u16 s_encoding_flags;
    1448             : #endif
    1449             :         struct hlist_bl_head    s_roots;        /* alternate root dentries for NFS */
    1450             :         struct list_head        s_mounts;       /* list of mounts; _not_ for fs use */
    1451             :         struct block_device     *s_bdev;
    1452             :         struct backing_dev_info *s_bdi;
    1453             :         struct mtd_info         *s_mtd;
    1454             :         struct hlist_node       s_instances;
    1455             :         unsigned int            s_quota_types;  /* Bitmask of supported quota types */
    1456             :         struct quota_info       s_dquot;        /* Diskquota specific options */
    1457             : 
    1458             :         struct sb_writers       s_writers;
    1459             : 
    1460             :         /*
    1461             :          * Keep s_fs_info, s_time_gran, s_fsnotify_mask, and
    1462             :          * s_fsnotify_marks together for cache efficiency. They are frequently
    1463             :          * accessed and rarely modified.
    1464             :          */
    1465             :         void                    *s_fs_info;     /* Filesystem private info */
    1466             : 
    1467             :         /* Granularity of c/m/atime in ns (cannot be worse than a second) */
    1468             :         u32                     s_time_gran;
    1469             :         /* Time limits for c/m/atime in seconds */
    1470             :         time64_t                   s_time_min;
    1471             :         time64_t                   s_time_max;
    1472             : #ifdef CONFIG_FSNOTIFY
    1473             :         __u32                   s_fsnotify_mask;
    1474             :         struct fsnotify_mark_connector __rcu    *s_fsnotify_marks;
    1475             : #endif
    1476             : 
    1477             :         char                    s_id[32];       /* Informational name */
    1478             :         uuid_t                  s_uuid;         /* UUID */
    1479             : 
    1480             :         unsigned int            s_max_links;
    1481             :         fmode_t                 s_mode;
    1482             : 
    1483             :         /*
    1484             :          * The next field is for VFS *only*. No filesystems have any business
    1485             :          * even looking at it. You had been warned.
    1486             :          */
    1487             :         struct mutex s_vfs_rename_mutex;        /* Kludge */
    1488             : 
    1489             :         /*
    1490             :          * Filesystem subtype.  If non-empty the filesystem type field
    1491             :          * in /proc/mounts will be "type.subtype"
    1492             :          */
    1493             :         const char *s_subtype;
    1494             : 
    1495             :         const struct dentry_operations *s_d_op; /* default d_op for dentries */
    1496             : 
    1497             :         /*
    1498             :          * Saved pool identifier for cleancache (-1 means none)
    1499             :          */
    1500             :         int cleancache_poolid;
    1501             : 
    1502             :         struct shrinker s_shrink;       /* per-sb shrinker handle */
    1503             : 
    1504             :         /* Number of inodes with nlink == 0 but still referenced */
    1505             :         atomic_long_t s_remove_count;
    1506             : 
    1507             :         /* Pending fsnotify inode refs */
    1508             :         atomic_long_t s_fsnotify_inode_refs;
    1509             : 
    1510             :         /* Being remounted read-only */
    1511             :         int s_readonly_remount;
    1512             : 
    1513             :         /* per-sb errseq_t for reporting writeback errors via syncfs */
    1514             :         errseq_t s_wb_err;
    1515             : 
    1516             :         /* AIO completions deferred from interrupt context */
    1517             :         struct workqueue_struct *s_dio_done_wq;
    1518             :         struct hlist_head s_pins;
    1519             : 
    1520             :         /*
    1521             :          * Owning user namespace and default context in which to
    1522             :          * interpret filesystem uids, gids, quotas, device nodes,
    1523             :          * xattrs and security labels.
    1524             :          */
    1525             :         struct user_namespace *s_user_ns;
    1526             : 
    1527             :         /*
    1528             :          * The list_lru structure is essentially just a pointer to a table
    1529             :          * of per-node lru lists, each of which has its own spinlock.
    1530             :          * There is no need to put them into separate cachelines.
    1531             :          */
    1532             :         struct list_lru         s_dentry_lru;
    1533             :         struct list_lru         s_inode_lru;
    1534             :         struct rcu_head         rcu;
    1535             :         struct work_struct      destroy_work;
    1536             : 
    1537             :         struct mutex            s_sync_lock;    /* sync serialisation lock */
    1538             : 
    1539             :         /*
    1540             :          * Indicates how deep in a filesystem stack this SB is
    1541             :          */
    1542             :         int s_stack_depth;
    1543             : 
    1544             :         /* s_inode_list_lock protects s_inodes */
    1545             :         spinlock_t              s_inode_list_lock ____cacheline_aligned_in_smp;
    1546             :         struct list_head        s_inodes;       /* all inodes */
    1547             : 
    1548             :         spinlock_t              s_inode_wblist_lock;
    1549             :         struct list_head        s_inodes_wb;    /* writeback inodes */
    1550             : } __randomize_layout;
    1551             : 
    1552             : /* Helper functions so that in most cases filesystems will
    1553             :  * not need to deal directly with kuid_t and kgid_t and can
    1554             :  * instead deal with the raw numeric values that are stored
    1555             :  * in the filesystem.
    1556             :  */
    1557       10433 : static inline uid_t i_uid_read(const struct inode *inode)
    1558             : {
    1559       10433 :         return from_kuid(inode->i_sb->s_user_ns, inode->i_uid);
    1560             : }
    1561             : 
    1562       10433 : static inline gid_t i_gid_read(const struct inode *inode)
    1563             : {
    1564       10433 :         return from_kgid(inode->i_sb->s_user_ns, inode->i_gid);
    1565             : }
    1566             : 
    1567       23564 : static inline void i_uid_write(struct inode *inode, uid_t uid)
    1568             : {
    1569       23564 :         inode->i_uid = make_kuid(inode->i_sb->s_user_ns, uid);
    1570             : }
    1571             : 
    1572       23564 : static inline void i_gid_write(struct inode *inode, gid_t gid)
    1573             : {
    1574       23564 :         inode->i_gid = make_kgid(inode->i_sb->s_user_ns, gid);
    1575           0 : }
    1576             : 
    1577      469291 : static inline kuid_t kuid_into_mnt(struct user_namespace *mnt_userns,
    1578             :                                    kuid_t kuid)
    1579             : {
    1580      469291 :         return make_kuid(mnt_userns, __kuid_val(kuid));
    1581             : }
    1582             : 
    1583      119919 : static inline kgid_t kgid_into_mnt(struct user_namespace *mnt_userns,
    1584             :                                    kgid_t kgid)
    1585             : {
    1586      119919 :         return make_kgid(mnt_userns, __kgid_val(kgid));
    1587             : }
    1588             : 
    1589      469291 : static inline kuid_t i_uid_into_mnt(struct user_namespace *mnt_userns,
    1590             :                                     const struct inode *inode)
    1591             : {
    1592      400883 :         return kuid_into_mnt(mnt_userns, inode->i_uid);
    1593             : }
    1594             : 
    1595      119919 : static inline kgid_t i_gid_into_mnt(struct user_namespace *mnt_userns,
    1596             :                                     const struct inode *inode)
    1597             : {
    1598      119919 :         return kgid_into_mnt(mnt_userns, inode->i_gid);
    1599             : }
    1600             : 
    1601        5056 : static inline kuid_t kuid_from_mnt(struct user_namespace *mnt_userns,
    1602             :                                    kuid_t kuid)
    1603             : {
    1604        5056 :         return KUIDT_INIT(from_kuid(mnt_userns, kuid));
    1605             : }
    1606             : 
    1607        5054 : static inline kgid_t kgid_from_mnt(struct user_namespace *mnt_userns,
    1608             :                                    kgid_t kgid)
    1609             : {
    1610        5054 :         return KGIDT_INIT(from_kgid(mnt_userns, kgid));
    1611             : }
    1612             : 
    1613        4862 : static inline kuid_t fsuid_into_mnt(struct user_namespace *mnt_userns)
    1614             : {
    1615        4862 :         return kuid_from_mnt(mnt_userns, current_fsuid());
    1616             : }
    1617             : 
    1618        4860 : static inline kgid_t fsgid_into_mnt(struct user_namespace *mnt_userns)
    1619             : {
    1620        4860 :         return kgid_from_mnt(mnt_userns, current_fsgid());
    1621             : }
    1622             : 
    1623             : extern struct timespec64 current_time(struct inode *inode);
    1624             : 
    1625             : /*
    1626             :  * Snapshotting support.
    1627             :  */
    1628             : 
    1629             : /*
    1630             :  * These are internal functions, please use sb_start_{write,pagefault,intwrite}
    1631             :  * instead.
    1632             :  */
    1633       22931 : static inline void __sb_end_write(struct super_block *sb, int level)
    1634             : {
    1635       22931 :         percpu_up_read(sb->s_writers.rw_sem + level-1);
    1636        1933 : }
    1637             : 
    1638       11075 : static inline void __sb_start_write(struct super_block *sb, int level)
    1639             : {
    1640       11075 :         percpu_down_read(sb->s_writers.rw_sem + level - 1);
    1641             : }
    1642             : 
    1643       11856 : static inline bool __sb_start_write_trylock(struct super_block *sb, int level)
    1644             : {
    1645       11856 :         return percpu_down_read_trylock(sb->s_writers.rw_sem + level - 1);
    1646             : }
    1647             : 
    1648             : #define __sb_writers_acquired(sb, lev)  \
    1649             :         percpu_rwsem_acquire(&(sb)->s_writers.rw_sem[(lev)-1], 1, _THIS_IP_)
    1650             : #define __sb_writers_release(sb, lev)   \
    1651             :         percpu_rwsem_release(&(sb)->s_writers.rw_sem[(lev)-1], 1, _THIS_IP_)
    1652             : 
    1653             : /**
    1654             :  * sb_end_write - drop write access to a superblock
    1655             :  * @sb: the super we wrote to
    1656             :  *
    1657             :  * Decrement number of writers to the filesystem. Wake up possible waiters
    1658             :  * wanting to freeze the filesystem.
    1659             :  */
    1660       20500 : static inline void sb_end_write(struct super_block *sb)
    1661             : {
    1662       20500 :         __sb_end_write(sb, SB_FREEZE_WRITE);
    1663        8751 : }
    1664             : 
    1665             : /**
    1666             :  * sb_end_pagefault - drop write access to a superblock from a page fault
    1667             :  * @sb: the super we wrote to
    1668             :  *
    1669             :  * Decrement number of processes handling write page fault to the filesystem.
    1670             :  * Wake up possible waiters wanting to freeze the filesystem.
    1671             :  */
    1672         304 : static inline void sb_end_pagefault(struct super_block *sb)
    1673             : {
    1674         304 :         __sb_end_write(sb, SB_FREEZE_PAGEFAULT);
    1675             : }
    1676             : 
    1677             : /**
    1678             :  * sb_end_intwrite - drop write access to a superblock for internal fs purposes
    1679             :  * @sb: the super we wrote to
    1680             :  *
    1681             :  * Decrement fs-internal number of writers to the filesystem.  Wake up possible
    1682             :  * waiters wanting to freeze the filesystem.
    1683             :  */
    1684         194 : static inline void sb_end_intwrite(struct super_block *sb)
    1685             : {
    1686         194 :         __sb_end_write(sb, SB_FREEZE_FS);
    1687         193 : }
    1688             : 
    1689             : /**
    1690             :  * sb_start_write - get write access to a superblock
    1691             :  * @sb: the super we write to
    1692             :  *
    1693             :  * When a process wants to write data or metadata to a file system (i.e. dirty
    1694             :  * a page or an inode), it should embed the operation in a sb_start_write() -
    1695             :  * sb_end_write() pair to get exclusion against file system freezing. This
    1696             :  * function increments number of writers preventing freezing. If the file
    1697             :  * system is already frozen, the function waits until the file system is
    1698             :  * thawed.
    1699             :  *
    1700             :  * Since freeze protection behaves as a lock, users have to preserve
    1701             :  * ordering of freeze protection and other filesystem locks. Generally,
    1702             :  * freeze protection should be the outermost lock. In particular, we have:
    1703             :  *
    1704             :  * sb_start_write
    1705             :  *   -> i_mutex                      (write path, truncate, directory ops, ...)
    1706             :  *   -> s_umount             (freeze_super, thaw_super)
    1707             :  */
    1708       10578 : static inline void sb_start_write(struct super_block *sb)
    1709             : {
    1710       10576 :         __sb_start_write(sb, SB_FREEZE_WRITE);
    1711        1933 : }
    1712             : 
    1713       11855 : static inline bool sb_start_write_trylock(struct super_block *sb)
    1714             : {
    1715       11855 :         return __sb_start_write_trylock(sb, SB_FREEZE_WRITE);
    1716             : }
    1717             : 
    1718             : /**
    1719             :  * sb_start_pagefault - get write access to a superblock from a page fault
    1720             :  * @sb: the super we write to
    1721             :  *
    1722             :  * When a process starts handling write page fault, it should embed the
    1723             :  * operation into sb_start_pagefault() - sb_end_pagefault() pair to get
    1724             :  * exclusion against file system freezing. This is needed since the page fault
    1725             :  * is going to dirty a page. This function increments number of running page
    1726             :  * faults preventing freezing. If the file system is already frozen, the
    1727             :  * function waits until the file system is thawed.
    1728             :  *
    1729             :  * Since page fault freeze protection behaves as a lock, users have to preserve
    1730             :  * ordering of freeze protection and other filesystem locks. It is advised to
    1731             :  * put sb_start_pagefault() close to mmap_lock in lock ordering. Page fault
    1732             :  * handling code implies lock dependency:
    1733             :  *
    1734             :  * mmap_lock
    1735             :  *   -> sb_start_pagefault
    1736             :  */
    1737         304 : static inline void sb_start_pagefault(struct super_block *sb)
    1738             : {
    1739         304 :         __sb_start_write(sb, SB_FREEZE_PAGEFAULT);
    1740             : }
    1741             : 
    1742             : /*
    1743             :  * sb_start_intwrite - get write access to a superblock for internal fs purposes
    1744             :  * @sb: the super we write to
    1745             :  *
    1746             :  * This is the third level of protection against filesystem freezing. It is
    1747             :  * free for use by a filesystem. The only requirement is that it must rank
    1748             :  * below sb_start_pagefault.
    1749             :  *
    1750             :  * For example filesystem can call sb_start_intwrite() when starting a
    1751             :  * transaction which somewhat eases handling of freezing for internal sources
    1752             :  * of filesystem changes (internal fs threads, discarding preallocation on file
    1753             :  * close, etc.).
    1754             :  */
    1755         193 : static inline void sb_start_intwrite(struct super_block *sb)
    1756             : {
    1757         193 :         __sb_start_write(sb, SB_FREEZE_FS);
    1758             : }
    1759             : 
    1760           1 : static inline bool sb_start_intwrite_trylock(struct super_block *sb)
    1761             : {
    1762           1 :         return __sb_start_write_trylock(sb, SB_FREEZE_FS);
    1763             : }
    1764             : 
    1765             : bool inode_owner_or_capable(struct user_namespace *mnt_userns,
    1766             :                             const struct inode *inode);
    1767             : 
    1768             : /*
    1769             :  * VFS helper functions..
    1770             :  */
    1771             : int vfs_create(struct user_namespace *, struct inode *,
    1772             :                struct dentry *, umode_t, bool);
    1773             : int vfs_mkdir(struct user_namespace *, struct inode *,
    1774             :               struct dentry *, umode_t);
    1775             : int vfs_mknod(struct user_namespace *, struct inode *, struct dentry *,
    1776             :               umode_t, dev_t);
    1777             : int vfs_symlink(struct user_namespace *, struct inode *,
    1778             :                 struct dentry *, const char *);
    1779             : int vfs_link(struct dentry *, struct user_namespace *, struct inode *,
    1780             :              struct dentry *, struct inode **);
    1781             : int vfs_rmdir(struct user_namespace *, struct inode *, struct dentry *);
    1782             : int vfs_unlink(struct user_namespace *, struct inode *, struct dentry *,
    1783             :                struct inode **);
    1784             : 
    1785             : struct renamedata {
    1786             :         struct user_namespace *old_mnt_userns;
    1787             :         struct inode *old_dir;
    1788             :         struct dentry *old_dentry;
    1789             :         struct user_namespace *new_mnt_userns;
    1790             :         struct inode *new_dir;
    1791             :         struct dentry *new_dentry;
    1792             :         struct inode **delegated_inode;
    1793             :         unsigned int flags;
    1794             : } __randomize_layout;
    1795             : 
    1796             : int vfs_rename(struct renamedata *);
    1797             : 
    1798           0 : static inline int vfs_whiteout(struct user_namespace *mnt_userns,
    1799             :                                struct inode *dir, struct dentry *dentry)
    1800             : {
    1801           0 :         return vfs_mknod(mnt_userns, dir, dentry, S_IFCHR | WHITEOUT_MODE,
    1802             :                          WHITEOUT_DEV);
    1803             : }
    1804             : 
    1805             : struct dentry *vfs_tmpfile(struct user_namespace *mnt_userns,
    1806             :                            struct dentry *dentry, umode_t mode, int open_flag);
    1807             : 
    1808             : int vfs_mkobj(struct dentry *, umode_t,
    1809             :                 int (*f)(struct dentry *, umode_t, void *),
    1810             :                 void *);
    1811             : 
    1812             : int vfs_fchown(struct file *file, uid_t user, gid_t group);
    1813             : int vfs_fchmod(struct file *file, umode_t mode);
    1814             : int vfs_utimes(const struct path *path, struct timespec64 *times);
    1815             : 
    1816             : extern long vfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
    1817             : 
    1818             : #ifdef CONFIG_COMPAT
    1819             : extern long compat_ptr_ioctl(struct file *file, unsigned int cmd,
    1820             :                                         unsigned long arg);
    1821             : #else
    1822             : #define compat_ptr_ioctl NULL
    1823             : #endif
    1824             : 
    1825             : /*
    1826             :  * VFS file helper functions.
    1827             :  */
    1828             : void inode_init_owner(struct user_namespace *mnt_userns, struct inode *inode,
    1829             :                       const struct inode *dir, umode_t mode);
    1830             : extern bool may_open_dev(const struct path *path);
    1831             : 
    1832             : /*
    1833             :  * This is the "filldir" function type, used by readdir() to let
    1834             :  * the kernel specify what kind of dirent layout it wants to have.
    1835             :  * This allows the kernel to read directories into kernel space or
    1836             :  * to have different dirent layouts depending on the binary type.
    1837             :  */
    1838             : struct dir_context;
    1839             : typedef int (*filldir_t)(struct dir_context *, const char *, int, loff_t, u64,
    1840             :                          unsigned);
    1841             : 
    1842             : struct dir_context {
    1843             :         filldir_t actor;
    1844             :         loff_t pos;
    1845             : };
    1846             : 
    1847             : /*
    1848             :  * These flags let !MMU mmap() govern direct device mapping vs immediate
    1849             :  * copying more easily for MAP_PRIVATE, especially for ROM filesystems.
    1850             :  *
    1851             :  * NOMMU_MAP_COPY:      Copy can be mapped (MAP_PRIVATE)
    1852             :  * NOMMU_MAP_DIRECT:    Can be mapped directly (MAP_SHARED)
    1853             :  * NOMMU_MAP_READ:      Can be mapped for reading
    1854             :  * NOMMU_MAP_WRITE:     Can be mapped for writing
    1855             :  * NOMMU_MAP_EXEC:      Can be mapped for execution
    1856             :  */
    1857             : #define NOMMU_MAP_COPY          0x00000001
    1858             : #define NOMMU_MAP_DIRECT        0x00000008
    1859             : #define NOMMU_MAP_READ          VM_MAYREAD
    1860             : #define NOMMU_MAP_WRITE         VM_MAYWRITE
    1861             : #define NOMMU_MAP_EXEC          VM_MAYEXEC
    1862             : 
    1863             : #define NOMMU_VMFLAGS \
    1864             :         (NOMMU_MAP_READ | NOMMU_MAP_WRITE | NOMMU_MAP_EXEC)
    1865             : 
    1866             : /*
    1867             :  * These flags control the behavior of the remap_file_range function pointer.
    1868             :  * If it is called with len == 0 that means "remap to end of source file".
    1869             :  * See Documentation/filesystems/vfs.rst for more details about this call.
    1870             :  *
    1871             :  * REMAP_FILE_DEDUP: only remap if contents identical (i.e. deduplicate)
    1872             :  * REMAP_FILE_CAN_SHORTEN: caller can handle a shortened request
    1873             :  */
    1874             : #define REMAP_FILE_DEDUP                (1 << 0)
    1875             : #define REMAP_FILE_CAN_SHORTEN          (1 << 1)
    1876             : 
    1877             : /*
    1878             :  * These flags signal that the caller is ok with altering various aspects of
    1879             :  * the behavior of the remap operation.  The changes must be made by the
    1880             :  * implementation; the vfs remap helper functions can take advantage of them.
    1881             :  * Flags in this category exist to preserve the quirky behavior of the hoisted
    1882             :  * btrfs clone/dedupe ioctls.
    1883             :  */
    1884             : #define REMAP_FILE_ADVISORY             (REMAP_FILE_CAN_SHORTEN)
    1885             : 
    1886             : struct iov_iter;
    1887             : 
    1888             : struct file_operations {
    1889             :         struct module *owner;
    1890             :         loff_t (*llseek) (struct file *, loff_t, int);
    1891             :         ssize_t (*read) (struct file *, char __user *, size_t, loff_t *);
    1892             :         ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *);
    1893             :         ssize_t (*read_iter) (struct kiocb *, struct iov_iter *);
    1894             :         ssize_t (*write_iter) (struct kiocb *, struct iov_iter *);
    1895             :         int (*iopoll)(struct kiocb *kiocb, bool spin);
    1896             :         int (*iterate) (struct file *, struct dir_context *);
    1897             :         int (*iterate_shared) (struct file *, struct dir_context *);
    1898             :         __poll_t (*poll) (struct file *, struct poll_table_struct *);
    1899             :         long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);
    1900             :         long (*compat_ioctl) (struct file *, unsigned int, unsigned long);
    1901             :         int (*mmap) (struct file *, struct vm_area_struct *);
    1902             :         unsigned long mmap_supported_flags;
    1903             :         int (*open) (struct inode *, struct file *);
    1904             :         int (*flush) (struct file *, fl_owner_t id);
    1905             :         int (*release) (struct inode *, struct file *);
    1906             :         int (*fsync) (struct file *, loff_t, loff_t, int datasync);
    1907             :         int (*fasync) (int, struct file *, int);
    1908             :         int (*lock) (struct file *, int, struct file_lock *);
    1909             :         ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int);
    1910             :         unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
    1911             :         int (*check_flags)(int);
    1912             :         int (*flock) (struct file *, int, struct file_lock *);
    1913             :         ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int);
    1914             :         ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int);
    1915             :         int (*setlease)(struct file *, long, struct file_lock **, void **);
    1916             :         long (*fallocate)(struct file *file, int mode, loff_t offset,
    1917             :                           loff_t len);
    1918             :         void (*show_fdinfo)(struct seq_file *m, struct file *f);
    1919             : #ifndef CONFIG_MMU
    1920             :         unsigned (*mmap_capabilities)(struct file *);
    1921             : #endif
    1922             :         ssize_t (*copy_file_range)(struct file *, loff_t, struct file *,
    1923             :                         loff_t, size_t, unsigned int);
    1924             :         loff_t (*remap_file_range)(struct file *file_in, loff_t pos_in,
    1925             :                                    struct file *file_out, loff_t pos_out,
    1926             :                                    loff_t len, unsigned int remap_flags);
    1927             :         int (*fadvise)(struct file *, loff_t, loff_t, int);
    1928             : } __randomize_layout;
    1929             : 
    1930             : struct inode_operations {
    1931             :         struct dentry * (*lookup) (struct inode *,struct dentry *, unsigned int);
    1932             :         const char * (*get_link) (struct dentry *, struct inode *, struct delayed_call *);
    1933             :         int (*permission) (struct user_namespace *, struct inode *, int);
    1934             :         struct posix_acl * (*get_acl)(struct inode *, int);
    1935             : 
    1936             :         int (*readlink) (struct dentry *, char __user *,int);
    1937             : 
    1938             :         int (*create) (struct user_namespace *, struct inode *,struct dentry *,
    1939             :                        umode_t, bool);
    1940             :         int (*link) (struct dentry *,struct inode *,struct dentry *);
    1941             :         int (*unlink) (struct inode *,struct dentry *);
    1942             :         int (*symlink) (struct user_namespace *, struct inode *,struct dentry *,
    1943             :                         const char *);
    1944             :         int (*mkdir) (struct user_namespace *, struct inode *,struct dentry *,
    1945             :                       umode_t);
    1946             :         int (*rmdir) (struct inode *,struct dentry *);
    1947             :         int (*mknod) (struct user_namespace *, struct inode *,struct dentry *,
    1948             :                       umode_t,dev_t);
    1949             :         int (*rename) (struct user_namespace *, struct inode *, struct dentry *,
    1950             :                         struct inode *, struct dentry *, unsigned int);
    1951             :         int (*setattr) (struct user_namespace *, struct dentry *,
    1952             :                         struct iattr *);
    1953             :         int (*getattr) (struct user_namespace *, const struct path *,
    1954             :                         struct kstat *, u32, unsigned int);
    1955             :         ssize_t (*listxattr) (struct dentry *, char *, size_t);
    1956             :         int (*fiemap)(struct inode *, struct fiemap_extent_info *, u64 start,
    1957             :                       u64 len);
    1958             :         int (*update_time)(struct inode *, struct timespec64 *, int);
    1959             :         int (*atomic_open)(struct inode *, struct dentry *,
    1960             :                            struct file *, unsigned open_flag,
    1961             :                            umode_t create_mode);
    1962             :         int (*tmpfile) (struct user_namespace *, struct inode *,
    1963             :                         struct dentry *, umode_t);
    1964             :         int (*set_acl)(struct user_namespace *, struct inode *,
    1965             :                        struct posix_acl *, int);
    1966             : } ____cacheline_aligned;
    1967             : 
    1968       22192 : static inline ssize_t call_read_iter(struct file *file, struct kiocb *kio,
    1969             :                                      struct iov_iter *iter)
    1970             : {
    1971       22192 :         return file->f_op->read_iter(kio, iter);
    1972             : }
    1973             : 
    1974       11634 : static inline ssize_t call_write_iter(struct file *file, struct kiocb *kio,
    1975             :                                       struct iov_iter *iter)
    1976             : {
    1977       11634 :         return file->f_op->write_iter(kio, iter);
    1978             : }
    1979             : 
    1980       22634 : static inline int call_mmap(struct file *file, struct vm_area_struct *vma)
    1981             : {
    1982       22634 :         return file->f_op->mmap(file, vma);
    1983             : }
    1984             : 
    1985             : extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *);
    1986             : extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *);
    1987             : extern ssize_t vfs_copy_file_range(struct file *, loff_t , struct file *,
    1988             :                                    loff_t, size_t, unsigned int);
    1989             : extern ssize_t generic_copy_file_range(struct file *file_in, loff_t pos_in,
    1990             :                                        struct file *file_out, loff_t pos_out,
    1991             :                                        size_t len, unsigned int flags);
    1992             : extern int generic_remap_file_range_prep(struct file *file_in, loff_t pos_in,
    1993             :                                          struct file *file_out, loff_t pos_out,
    1994             :                                          loff_t *count,
    1995             :                                          unsigned int remap_flags);
    1996             : extern loff_t do_clone_file_range(struct file *file_in, loff_t pos_in,
    1997             :                                   struct file *file_out, loff_t pos_out,
    1998             :                                   loff_t len, unsigned int remap_flags);
    1999             : extern loff_t vfs_clone_file_range(struct file *file_in, loff_t pos_in,
    2000             :                                    struct file *file_out, loff_t pos_out,
    2001             :                                    loff_t len, unsigned int remap_flags);
    2002             : extern int vfs_dedupe_file_range(struct file *file,
    2003             :                                  struct file_dedupe_range *same);
    2004             : extern loff_t vfs_dedupe_file_range_one(struct file *src_file, loff_t src_pos,
    2005             :                                         struct file *dst_file, loff_t dst_pos,
    2006             :                                         loff_t len, unsigned int remap_flags);
    2007             : 
    2008             : 
    2009             : struct super_operations {
    2010             :         struct inode *(*alloc_inode)(struct super_block *sb);
    2011             :         void (*destroy_inode)(struct inode *);
    2012             :         void (*free_inode)(struct inode *);
    2013             : 
    2014             :         void (*dirty_inode) (struct inode *, int flags);
    2015             :         int (*write_inode) (struct inode *, struct writeback_control *wbc);
    2016             :         int (*drop_inode) (struct inode *);
    2017             :         void (*evict_inode) (struct inode *);
    2018             :         void (*put_super) (struct super_block *);
    2019             :         int (*sync_fs)(struct super_block *sb, int wait);
    2020             :         int (*freeze_super) (struct super_block *);
    2021             :         int (*freeze_fs) (struct super_block *);
    2022             :         int (*thaw_super) (struct super_block *);
    2023             :         int (*unfreeze_fs) (struct super_block *);
    2024             :         int (*statfs) (struct dentry *, struct kstatfs *);
    2025             :         int (*remount_fs) (struct super_block *, int *, char *);
    2026             :         void (*umount_begin) (struct super_block *);
    2027             : 
    2028             :         int (*show_options)(struct seq_file *, struct dentry *);
    2029             :         int (*show_devname)(struct seq_file *, struct dentry *);
    2030             :         int (*show_path)(struct seq_file *, struct dentry *);
    2031             :         int (*show_stats)(struct seq_file *, struct dentry *);
    2032             : #ifdef CONFIG_QUOTA
    2033             :         ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t);
    2034             :         ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t);
    2035             :         struct dquot **(*get_dquots)(struct inode *);
    2036             : #endif
    2037             :         int (*bdev_try_to_free_page)(struct super_block*, struct page*, gfp_t);
    2038             :         long (*nr_cached_objects)(struct super_block *,
    2039             :                                   struct shrink_control *);
    2040             :         long (*free_cached_objects)(struct super_block *,
    2041             :                                     struct shrink_control *);
    2042             : };
    2043             : 
    2044             : /*
    2045             :  * Inode flags - they have no relation to superblock flags now
    2046             :  */
    2047             : #define S_SYNC          (1 << 0)  /* Writes are synced at once */
    2048             : #define S_NOATIME       (1 << 1)  /* Do not update access times */
    2049             : #define S_APPEND        (1 << 2)  /* Append-only file */
    2050             : #define S_IMMUTABLE     (1 << 3)  /* Immutable file */
    2051             : #define S_DEAD          (1 << 4)  /* removed, but still open directory */
    2052             : #define S_NOQUOTA       (1 << 5)  /* Inode is not counted to quota */
    2053             : #define S_DIRSYNC       (1 << 6)  /* Directory modifications are synchronous */
    2054             : #define S_NOCMTIME      (1 << 7)  /* Do not update file c/mtime */
    2055             : #define S_SWAPFILE      (1 << 8)  /* Do not truncate: swapon got its bmaps */
    2056             : #define S_PRIVATE       (1 << 9)  /* Inode is fs-internal */
    2057             : #define S_IMA           (1 << 10) /* Inode has an associated IMA struct */
    2058             : #define S_AUTOMOUNT     (1 << 11) /* Automount/referral quasi-directory */
    2059             : #define S_NOSEC         (1 << 12) /* no suid or xattr security attributes */
    2060             : #ifdef CONFIG_FS_DAX
    2061             : #define S_DAX           (1 << 13) /* Direct Access, avoiding the page cache */
    2062             : #else
    2063             : #define S_DAX           0         /* Make all the DAX code disappear */
    2064             : #endif
    2065             : #define S_ENCRYPTED     (1 << 14) /* Encrypted file (using fs/crypto/) */
    2066             : #define S_CASEFOLD      (1 << 15) /* Casefolded file */
    2067             : #define S_VERITY        (1 << 16) /* Verity file (using fs/verity/) */
    2068             : 
    2069             : /*
    2070             :  * Note that nosuid etc flags are inode-specific: setting some file-system
    2071             :  * flags just means all the inodes inherit those flags by default. It might be
    2072             :  * possible to override it selectively if you really wanted to with some
    2073             :  * ioctl() that is not currently implemented.
    2074             :  *
    2075             :  * Exception: SB_RDONLY is always applied to the entire file system.
    2076             :  *
    2077             :  * Unfortunately, it is possible to change a filesystems flags with it mounted
    2078             :  * with files in use.  This means that all of the inodes will not have their
    2079             :  * i_flags updated.  Hence, i_flags no longer inherit the superblock mount
    2080             :  * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
    2081             :  */
    2082             : #define __IS_FLG(inode, flg)    ((inode)->i_sb->s_flags & (flg))
    2083             : 
    2084       37137 : static inline bool sb_rdonly(const struct super_block *sb) { return sb->s_flags & SB_RDONLY; }
    2085             : #define IS_RDONLY(inode)        sb_rdonly((inode)->i_sb)
    2086             : #define IS_SYNC(inode)          (__IS_FLG(inode, SB_SYNCHRONOUS) || \
    2087             :                                         ((inode)->i_flags & S_SYNC))
    2088             : #define IS_DIRSYNC(inode)       (__IS_FLG(inode, SB_SYNCHRONOUS|SB_DIRSYNC) || \
    2089             :                                         ((inode)->i_flags & (S_SYNC|S_DIRSYNC)))
    2090             : #define IS_MANDLOCK(inode)      __IS_FLG(inode, SB_MANDLOCK)
    2091             : #define IS_NOATIME(inode)       __IS_FLG(inode, SB_RDONLY|SB_NOATIME)
    2092             : #define IS_I_VERSION(inode)     __IS_FLG(inode, SB_I_VERSION)
    2093             : 
    2094             : #define IS_NOQUOTA(inode)       ((inode)->i_flags & S_NOQUOTA)
    2095             : #define IS_APPEND(inode)        ((inode)->i_flags & S_APPEND)
    2096             : #define IS_IMMUTABLE(inode)     ((inode)->i_flags & S_IMMUTABLE)
    2097             : #define IS_POSIXACL(inode)      __IS_FLG(inode, SB_POSIXACL)
    2098             : 
    2099             : #define IS_DEADDIR(inode)       ((inode)->i_flags & S_DEAD)
    2100             : #define IS_NOCMTIME(inode)      ((inode)->i_flags & S_NOCMTIME)
    2101             : #define IS_SWAPFILE(inode)      ((inode)->i_flags & S_SWAPFILE)
    2102             : #define IS_PRIVATE(inode)       ((inode)->i_flags & S_PRIVATE)
    2103             : #define IS_IMA(inode)           ((inode)->i_flags & S_IMA)
    2104             : #define IS_AUTOMOUNT(inode)     ((inode)->i_flags & S_AUTOMOUNT)
    2105             : #define IS_NOSEC(inode)         ((inode)->i_flags & S_NOSEC)
    2106             : #define IS_DAX(inode)           ((inode)->i_flags & S_DAX)
    2107             : #define IS_ENCRYPTED(inode)     ((inode)->i_flags & S_ENCRYPTED)
    2108             : #define IS_CASEFOLDED(inode)    ((inode)->i_flags & S_CASEFOLD)
    2109             : #define IS_VERITY(inode)        ((inode)->i_flags & S_VERITY)
    2110             : 
    2111             : #define IS_WHITEOUT(inode)      (S_ISCHR(inode->i_mode) && \
    2112             :                                  (inode)->i_rdev == WHITEOUT_DEV)
    2113             : 
    2114       68477 : static inline bool HAS_UNMAPPED_ID(struct user_namespace *mnt_userns,
    2115             :                                    struct inode *inode)
    2116             : {
    2117       68477 :         return !uid_valid(i_uid_into_mnt(mnt_userns, inode)) ||
    2118       68478 :                !gid_valid(i_gid_into_mnt(mnt_userns, inode));
    2119             : }
    2120             : 
    2121       40791 : static inline enum rw_hint file_write_hint(struct file *file)
    2122             : {
    2123       40791 :         if (file->f_write_hint != WRITE_LIFE_NOT_SET)
    2124             :                 return file->f_write_hint;
    2125             : 
    2126       40791 :         return file_inode(file)->i_write_hint;
    2127             : }
    2128             : 
    2129             : static inline int iocb_flags(struct file *file);
    2130             : 
    2131       40791 : static inline u16 ki_hint_validate(enum rw_hint hint)
    2132             : {
    2133       40791 :         typeof(((struct kiocb *)0)->ki_hint) max_hint = -1;
    2134             : 
    2135       40791 :         if (hint <= max_hint)
    2136       40792 :                 return hint;
    2137             :         return 0;
    2138             : }
    2139             : 
    2140       40791 : static inline void init_sync_kiocb(struct kiocb *kiocb, struct file *filp)
    2141             : {
    2142       81582 :         *kiocb = (struct kiocb) {
    2143             :                 .ki_filp = filp,
    2144       40791 :                 .ki_flags = iocb_flags(filp),
    2145       81583 :                 .ki_hint = ki_hint_validate(file_write_hint(filp)),
    2146       40791 :                 .ki_ioprio = get_current_ioprio(),
    2147             :         };
    2148       40791 : }
    2149             : 
    2150           0 : static inline void kiocb_clone(struct kiocb *kiocb, struct kiocb *kiocb_src,
    2151             :                                struct file *filp)
    2152             : {
    2153           0 :         *kiocb = (struct kiocb) {
    2154             :                 .ki_filp = filp,
    2155           0 :                 .ki_flags = kiocb_src->ki_flags,
    2156           0 :                 .ki_hint = kiocb_src->ki_hint,
    2157           0 :                 .ki_ioprio = kiocb_src->ki_ioprio,
    2158           0 :                 .ki_pos = kiocb_src->ki_pos,
    2159             :         };
    2160             : }
    2161             : 
    2162             : /*
    2163             :  * Inode state bits.  Protected by inode->i_lock
    2164             :  *
    2165             :  * Four bits determine the dirty state of the inode: I_DIRTY_SYNC,
    2166             :  * I_DIRTY_DATASYNC, I_DIRTY_PAGES, and I_DIRTY_TIME.
    2167             :  *
    2168             :  * Four bits define the lifetime of an inode.  Initially, inodes are I_NEW,
    2169             :  * until that flag is cleared.  I_WILL_FREE, I_FREEING and I_CLEAR are set at
    2170             :  * various stages of removing an inode.
    2171             :  *
    2172             :  * Two bits are used for locking and completion notification, I_NEW and I_SYNC.
    2173             :  *
    2174             :  * I_DIRTY_SYNC         Inode is dirty, but doesn't have to be written on
    2175             :  *                      fdatasync() (unless I_DIRTY_DATASYNC is also set).
    2176             :  *                      Timestamp updates are the usual cause.
    2177             :  * I_DIRTY_DATASYNC     Data-related inode changes pending.  We keep track of
    2178             :  *                      these changes separately from I_DIRTY_SYNC so that we
    2179             :  *                      don't have to write inode on fdatasync() when only
    2180             :  *                      e.g. the timestamps have changed.
    2181             :  * I_DIRTY_PAGES        Inode has dirty pages.  Inode itself may be clean.
    2182             :  * I_DIRTY_TIME         The inode itself only has dirty timestamps, and the
    2183             :  *                      lazytime mount option is enabled.  We keep track of this
    2184             :  *                      separately from I_DIRTY_SYNC in order to implement
    2185             :  *                      lazytime.  This gets cleared if I_DIRTY_INODE
    2186             :  *                      (I_DIRTY_SYNC and/or I_DIRTY_DATASYNC) gets set.  I.e.
    2187             :  *                      either I_DIRTY_TIME *or* I_DIRTY_INODE can be set in
    2188             :  *                      i_state, but not both.  I_DIRTY_PAGES may still be set.
    2189             :  * I_NEW                Serves as both a mutex and completion notification.
    2190             :  *                      New inodes set I_NEW.  If two processes both create
    2191             :  *                      the same inode, one of them will release its inode and
    2192             :  *                      wait for I_NEW to be released before returning.
    2193             :  *                      Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can
    2194             :  *                      also cause waiting on I_NEW, without I_NEW actually
    2195             :  *                      being set.  find_inode() uses this to prevent returning
    2196             :  *                      nearly-dead inodes.
    2197             :  * I_WILL_FREE          Must be set when calling write_inode_now() if i_count
    2198             :  *                      is zero.  I_FREEING must be set when I_WILL_FREE is
    2199             :  *                      cleared.
    2200             :  * I_FREEING            Set when inode is about to be freed but still has dirty
    2201             :  *                      pages or buffers attached or the inode itself is still
    2202             :  *                      dirty.
    2203             :  * I_CLEAR              Added by clear_inode().  In this state the inode is
    2204             :  *                      clean and can be destroyed.  Inode keeps I_FREEING.
    2205             :  *
    2206             :  *                      Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are
    2207             :  *                      prohibited for many purposes.  iget() must wait for
    2208             :  *                      the inode to be completely released, then create it
    2209             :  *                      anew.  Other functions will just ignore such inodes,
    2210             :  *                      if appropriate.  I_NEW is used for waiting.
    2211             :  *
    2212             :  * I_SYNC               Writeback of inode is running. The bit is set during
    2213             :  *                      data writeback, and cleared with a wakeup on the bit
    2214             :  *                      address once it is done. The bit is also used to pin
    2215             :  *                      the inode in memory for flusher thread.
    2216             :  *
    2217             :  * I_REFERENCED         Marks the inode as recently references on the LRU list.
    2218             :  *
    2219             :  * I_DIO_WAKEUP         Never set.  Only used as a key for wait_on_bit().
    2220             :  *
    2221             :  * I_WB_SWITCH          Cgroup bdi_writeback switching in progress.  Used to
    2222             :  *                      synchronize competing switching instances and to tell
    2223             :  *                      wb stat updates to grab the i_pages lock.  See
    2224             :  *                      inode_switch_wbs_work_fn() for details.
    2225             :  *
    2226             :  * I_OVL_INUSE          Used by overlayfs to get exclusive ownership on upper
    2227             :  *                      and work dirs among overlayfs mounts.
    2228             :  *
    2229             :  * I_CREATING           New object's inode in the middle of setting up.
    2230             :  *
    2231             :  * I_DONTCACHE          Evict inode as soon as it is not used anymore.
    2232             :  *
    2233             :  * I_SYNC_QUEUED        Inode is queued in b_io or b_more_io writeback lists.
    2234             :  *                      Used to detect that mark_inode_dirty() should not move
    2235             :  *                      inode between dirty lists.
    2236             :  *
    2237             :  * Q: What is the difference between I_WILL_FREE and I_FREEING?
    2238             :  */
    2239             : #define I_DIRTY_SYNC            (1 << 0)
    2240             : #define I_DIRTY_DATASYNC        (1 << 1)
    2241             : #define I_DIRTY_PAGES           (1 << 2)
    2242             : #define __I_NEW                 3
    2243             : #define I_NEW                   (1 << __I_NEW)
    2244             : #define I_WILL_FREE             (1 << 4)
    2245             : #define I_FREEING               (1 << 5)
    2246             : #define I_CLEAR                 (1 << 6)
    2247             : #define __I_SYNC                7
    2248             : #define I_SYNC                  (1 << __I_SYNC)
    2249             : #define I_REFERENCED            (1 << 8)
    2250             : #define __I_DIO_WAKEUP          9
    2251             : #define I_DIO_WAKEUP            (1 << __I_DIO_WAKEUP)
    2252             : #define I_LINKABLE              (1 << 10)
    2253             : #define I_DIRTY_TIME            (1 << 11)
    2254             : #define I_WB_SWITCH             (1 << 13)
    2255             : #define I_OVL_INUSE             (1 << 14)
    2256             : #define I_CREATING              (1 << 15)
    2257             : #define I_DONTCACHE             (1 << 16)
    2258             : #define I_SYNC_QUEUED           (1 << 17)
    2259             : 
    2260             : #define I_DIRTY_INODE (I_DIRTY_SYNC | I_DIRTY_DATASYNC)
    2261             : #define I_DIRTY (I_DIRTY_INODE | I_DIRTY_PAGES)
    2262             : #define I_DIRTY_ALL (I_DIRTY | I_DIRTY_TIME)
    2263             : 
    2264             : extern void __mark_inode_dirty(struct inode *, int);
    2265        2991 : static inline void mark_inode_dirty(struct inode *inode)
    2266             : {
    2267        2991 :         __mark_inode_dirty(inode, I_DIRTY);
    2268        2304 : }
    2269             : 
    2270         278 : static inline void mark_inode_dirty_sync(struct inode *inode)
    2271             : {
    2272         278 :         __mark_inode_dirty(inode, I_DIRTY_SYNC);
    2273           0 : }
    2274             : 
    2275             : /*
    2276             :  * Returns true if the given inode itself only has dirty timestamps (its pages
    2277             :  * may still be dirty) and isn't currently being allocated or freed.
    2278             :  * Filesystems should call this if when writing an inode when lazytime is
    2279             :  * enabled, they want to opportunistically write the timestamps of other inodes
    2280             :  * located very nearby on-disk, e.g. in the same inode block.  This returns true
    2281             :  * if the given inode is in need of such an opportunistic update.  Requires
    2282             :  * i_lock, or at least later re-checking under i_lock.
    2283             :  */
    2284           0 : static inline bool inode_is_dirtytime_only(struct inode *inode)
    2285             : {
    2286           0 :         return (inode->i_state & (I_DIRTY_TIME | I_NEW |
    2287             :                                   I_FREEING | I_WILL_FREE)) == I_DIRTY_TIME;
    2288             : }
    2289             : 
    2290             : extern void inc_nlink(struct inode *inode);
    2291             : extern void drop_nlink(struct inode *inode);
    2292             : extern void clear_nlink(struct inode *inode);
    2293             : extern void set_nlink(struct inode *inode, unsigned int nlink);
    2294             : 
    2295             : static inline void inode_inc_link_count(struct inode *inode)
    2296             : {
    2297             :         inc_nlink(inode);
    2298             :         mark_inode_dirty(inode);
    2299             : }
    2300             : 
    2301           5 : static inline void inode_dec_link_count(struct inode *inode)
    2302             : {
    2303           5 :         drop_nlink(inode);
    2304           5 :         mark_inode_dirty(inode);
    2305           5 : }
    2306             : 
    2307             : enum file_time_flags {
    2308             :         S_ATIME = 1,
    2309             :         S_MTIME = 2,
    2310             :         S_CTIME = 4,
    2311             :         S_VERSION = 8,
    2312             : };
    2313             : 
    2314             : extern bool atime_needs_update(const struct path *, struct inode *);
    2315             : extern void touch_atime(const struct path *);
    2316       38113 : static inline void file_accessed(struct file *file)
    2317             : {
    2318       38113 :         if (!(file->f_flags & O_NOATIME))
    2319       38071 :                 touch_atime(&file->f_path);
    2320       38113 : }
    2321             : 
    2322             : extern int file_modified(struct file *file);
    2323             : 
    2324             : int sync_inode(struct inode *inode, struct writeback_control *wbc);
    2325             : int sync_inode_metadata(struct inode *inode, int wait);
    2326             : 
    2327             : struct file_system_type {
    2328             :         const char *name;
    2329             :         int fs_flags;
    2330             : #define FS_REQUIRES_DEV         1 
    2331             : #define FS_BINARY_MOUNTDATA     2
    2332             : #define FS_HAS_SUBTYPE          4
    2333             : #define FS_USERNS_MOUNT         8       /* Can be mounted by userns root */
    2334             : #define FS_DISALLOW_NOTIFY_PERM 16      /* Disable fanotify permission events */
    2335             : #define FS_ALLOW_IDMAP         32      /* FS has been updated to handle vfs idmappings. */
    2336             : #define FS_THP_SUPPORT          8192    /* Remove once all fs converted */
    2337             : #define FS_RENAME_DOES_D_MOVE   32768   /* FS will handle d_move() during rename() internally. */
    2338             :         int (*init_fs_context)(struct fs_context *);
    2339             :         const struct fs_parameter_spec *parameters;
    2340             :         struct dentry *(*mount) (struct file_system_type *, int,
    2341             :                        const char *, void *);
    2342             :         void (*kill_sb) (struct super_block *);
    2343             :         struct module *owner;
    2344             :         struct file_system_type * next;
    2345             :         struct hlist_head fs_supers;
    2346             : 
    2347             :         struct lock_class_key s_lock_key;
    2348             :         struct lock_class_key s_umount_key;
    2349             :         struct lock_class_key s_vfs_rename_key;
    2350             :         struct lock_class_key s_writers_key[SB_FREEZE_LEVELS];
    2351             : 
    2352             :         struct lock_class_key i_lock_key;
    2353             :         struct lock_class_key i_mutex_key;
    2354             :         struct lock_class_key i_mutex_dir_key;
    2355             : };
    2356             : 
    2357             : #define MODULE_ALIAS_FS(NAME) MODULE_ALIAS("fs-" NAME)
    2358             : 
    2359             : extern struct dentry *mount_bdev(struct file_system_type *fs_type,
    2360             :         int flags, const char *dev_name, void *data,
    2361             :         int (*fill_super)(struct super_block *, void *, int));
    2362             : extern struct dentry *mount_single(struct file_system_type *fs_type,
    2363             :         int flags, void *data,
    2364             :         int (*fill_super)(struct super_block *, void *, int));
    2365             : extern struct dentry *mount_nodev(struct file_system_type *fs_type,
    2366             :         int flags, void *data,
    2367             :         int (*fill_super)(struct super_block *, void *, int));
    2368             : extern struct dentry *mount_subtree(struct vfsmount *mnt, const char *path);
    2369             : void generic_shutdown_super(struct super_block *sb);
    2370             : void kill_block_super(struct super_block *sb);
    2371             : void kill_anon_super(struct super_block *sb);
    2372             : void kill_litter_super(struct super_block *sb);
    2373             : void deactivate_super(struct super_block *sb);
    2374             : void deactivate_locked_super(struct super_block *sb);
    2375             : int set_anon_super(struct super_block *s, void *data);
    2376             : int set_anon_super_fc(struct super_block *s, struct fs_context *fc);
    2377             : int get_anon_bdev(dev_t *);
    2378             : void free_anon_bdev(dev_t);
    2379             : struct super_block *sget_fc(struct fs_context *fc,
    2380             :                             int (*test)(struct super_block *, struct fs_context *),
    2381             :                             int (*set)(struct super_block *, struct fs_context *));
    2382             : struct super_block *sget(struct file_system_type *type,
    2383             :                         int (*test)(struct super_block *,void *),
    2384             :                         int (*set)(struct super_block *,void *),
    2385             :                         int flags, void *data);
    2386             : 
    2387             : /* Alas, no aliases. Too much hassle with bringing module.h everywhere */
    2388             : #define fops_get(fops) \
    2389             :         (((fops) && try_module_get((fops)->owner) ? (fops) : NULL))
    2390             : #define fops_put(fops) \
    2391             :         do { if (fops) module_put((fops)->owner); } while(0)
    2392             : /*
    2393             :  * This one is to be used *ONLY* from ->open() instances.
    2394             :  * fops must be non-NULL, pinned down *and* module dependencies
    2395             :  * should be sufficient to pin the caller down as well.
    2396             :  */
    2397             : #define replace_fops(f, fops) \
    2398             :         do {    \
    2399             :                 struct file *__file = (f); \
    2400             :                 fops_put(__file->f_op); \
    2401             :                 BUG_ON(!(__file->f_op = (fops))); \
    2402             :         } while(0)
    2403             : 
    2404             : extern int register_filesystem(struct file_system_type *);
    2405             : extern int unregister_filesystem(struct file_system_type *);
    2406             : extern struct vfsmount *kern_mount(struct file_system_type *);
    2407             : extern void kern_unmount(struct vfsmount *mnt);
    2408             : extern int may_umount_tree(struct vfsmount *);
    2409             : extern int may_umount(struct vfsmount *);
    2410             : extern long do_mount(const char *, const char __user *,
    2411             :                      const char *, unsigned long, void *);
    2412             : extern struct vfsmount *collect_mounts(const struct path *);
    2413             : extern void drop_collected_mounts(struct vfsmount *);
    2414             : extern int iterate_mounts(int (*)(struct vfsmount *, void *), void *,
    2415             :                           struct vfsmount *);
    2416             : extern int vfs_statfs(const struct path *, struct kstatfs *);
    2417             : extern int user_statfs(const char __user *, struct kstatfs *);
    2418             : extern int fd_statfs(int, struct kstatfs *);
    2419             : extern int freeze_super(struct super_block *super);
    2420             : extern int thaw_super(struct super_block *super);
    2421             : extern bool our_mnt(struct vfsmount *mnt);
    2422             : extern __printf(2, 3)
    2423             : int super_setup_bdi_name(struct super_block *sb, char *fmt, ...);
    2424             : extern int super_setup_bdi(struct super_block *sb);
    2425             : 
    2426             : extern int current_umask(void);
    2427             : 
    2428             : extern void ihold(struct inode * inode);
    2429             : extern void iput(struct inode *);
    2430             : extern int generic_update_time(struct inode *, struct timespec64 *, int);
    2431             : 
    2432             : /* /sys/fs */
    2433             : extern struct kobject *fs_kobj;
    2434             : 
    2435             : #define MAX_RW_COUNT (INT_MAX & PAGE_MASK)
    2436             : 
    2437             : #ifdef CONFIG_MANDATORY_FILE_LOCKING
    2438             : extern int locks_mandatory_locked(struct file *);
    2439             : extern int locks_mandatory_area(struct inode *, struct file *, loff_t, loff_t, unsigned char);
    2440             : 
    2441             : /*
    2442             :  * Candidates for mandatory locking have the setgid bit set
    2443             :  * but no group execute bit -  an otherwise meaningless combination.
    2444             :  */
    2445             : 
    2446             : static inline int __mandatory_lock(struct inode *ino)
    2447             : {
    2448             :         return (ino->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID;
    2449             : }
    2450             : 
    2451             : /*
    2452             :  * ... and these candidates should be on SB_MANDLOCK mounted fs,
    2453             :  * otherwise these will be advisory locks
    2454             :  */
    2455             : 
    2456             : static inline int mandatory_lock(struct inode *ino)
    2457             : {
    2458             :         return IS_MANDLOCK(ino) && __mandatory_lock(ino);
    2459             : }
    2460             : 
    2461             : static inline int locks_verify_locked(struct file *file)
    2462             : {
    2463             :         if (mandatory_lock(locks_inode(file)))
    2464             :                 return locks_mandatory_locked(file);
    2465             :         return 0;
    2466             : }
    2467             : 
    2468             : static inline int locks_verify_truncate(struct inode *inode,
    2469             :                                     struct file *f,
    2470             :                                     loff_t size)
    2471             : {
    2472             :         if (!inode->i_flctx || !mandatory_lock(inode))
    2473             :                 return 0;
    2474             : 
    2475             :         if (size < inode->i_size) {
    2476             :                 return locks_mandatory_area(inode, f, size, inode->i_size - 1,
    2477             :                                 F_WRLCK);
    2478             :         } else {
    2479             :                 return locks_mandatory_area(inode, f, inode->i_size, size - 1,
    2480             :                                 F_WRLCK);
    2481             :         }
    2482             : }
    2483             : 
    2484             : #else /* !CONFIG_MANDATORY_FILE_LOCKING */
    2485             : 
    2486             : static inline int locks_mandatory_locked(struct file *file)
    2487             : {
    2488             :         return 0;
    2489             : }
    2490             : 
    2491             : static inline int locks_mandatory_area(struct inode *inode, struct file *filp,
    2492             :                                        loff_t start, loff_t end, unsigned char type)
    2493             : {
    2494             :         return 0;
    2495             : }
    2496             : 
    2497             : static inline int __mandatory_lock(struct inode *inode)
    2498             : {
    2499             :         return 0;
    2500             : }
    2501             : 
    2502          90 : static inline int mandatory_lock(struct inode *inode)
    2503             : {
    2504          90 :         return 0;
    2505             : }
    2506             : 
    2507         229 : static inline int locks_verify_locked(struct file *file)
    2508             : {
    2509         229 :         return 0;
    2510             : }
    2511             : 
    2512          51 : static inline int locks_verify_truncate(struct inode *inode, struct file *filp,
    2513             :                                         size_t size)
    2514             : {
    2515          51 :         return 0;
    2516             : }
    2517             : 
    2518             : #endif /* CONFIG_MANDATORY_FILE_LOCKING */
    2519             : 
    2520             : 
    2521             : #ifdef CONFIG_FILE_LOCKING
    2522       15394 : static inline int break_lease(struct inode *inode, unsigned int mode)
    2523             : {
    2524             :         /*
    2525             :          * Since this check is lockless, we must ensure that any refcounts
    2526             :          * taken are done before checking i_flctx->flc_lease. Otherwise, we
    2527             :          * could end up racing with tasks trying to set a new lease on this
    2528             :          * file.
    2529             :          */
    2530       15394 :         smp_mb();
    2531       15394 :         if (inode->i_flctx && !list_empty_careful(&inode->i_flctx->flc_lease))
    2532           0 :                 return __break_lease(inode, mode, FL_LEASE);
    2533             :         return 0;
    2534             : }
    2535             : 
    2536        2323 : static inline int break_deleg(struct inode *inode, unsigned int mode)
    2537             : {
    2538             :         /*
    2539             :          * Since this check is lockless, we must ensure that any refcounts
    2540             :          * taken are done before checking i_flctx->flc_lease. Otherwise, we
    2541             :          * could end up racing with tasks trying to set a new lease on this
    2542             :          * file.
    2543             :          */
    2544        2323 :         smp_mb();
    2545        2323 :         if (inode->i_flctx && !list_empty_careful(&inode->i_flctx->flc_lease))
    2546           0 :                 return __break_lease(inode, mode, FL_DELEG);
    2547             :         return 0;
    2548             : }
    2549             : 
    2550        2323 : static inline int try_break_deleg(struct inode *inode, struct inode **delegated_inode)
    2551             : {
    2552        2323 :         int ret;
    2553             : 
    2554        2323 :         ret = break_deleg(inode, O_WRONLY|O_NONBLOCK);
    2555        2323 :         if (ret == -EWOULDBLOCK && delegated_inode) {
    2556           0 :                 *delegated_inode = inode;
    2557           0 :                 ihold(inode);
    2558             :         }
    2559        2323 :         return ret;
    2560             : }
    2561             : 
    2562           0 : static inline int break_deleg_wait(struct inode **delegated_inode)
    2563             : {
    2564           0 :         int ret;
    2565             : 
    2566           0 :         ret = break_deleg(*delegated_inode, O_WRONLY);
    2567           0 :         iput(*delegated_inode);
    2568           0 :         *delegated_inode = NULL;
    2569           0 :         return ret;
    2570             : }
    2571             : 
    2572             : static inline int break_layout(struct inode *inode, bool wait)
    2573             : {
    2574             :         smp_mb();
    2575             :         if (inode->i_flctx && !list_empty_careful(&inode->i_flctx->flc_lease))
    2576             :                 return __break_lease(inode,
    2577             :                                 wait ? O_WRONLY : O_WRONLY | O_NONBLOCK,
    2578             :                                 FL_LAYOUT);
    2579             :         return 0;
    2580             : }
    2581             : 
    2582             : #else /* !CONFIG_FILE_LOCKING */
    2583             : static inline int break_lease(struct inode *inode, unsigned int mode)
    2584             : {
    2585             :         return 0;
    2586             : }
    2587             : 
    2588             : static inline int break_deleg(struct inode *inode, unsigned int mode)
    2589             : {
    2590             :         return 0;
    2591             : }
    2592             : 
    2593             : static inline int try_break_deleg(struct inode *inode, struct inode **delegated_inode)
    2594             : {
    2595             :         return 0;
    2596             : }
    2597             : 
    2598             : static inline int break_deleg_wait(struct inode **delegated_inode)
    2599             : {
    2600             :         BUG();
    2601             :         return 0;
    2602             : }
    2603             : 
    2604             : static inline int break_layout(struct inode *inode, bool wait)
    2605             : {
    2606             :         return 0;
    2607             : }
    2608             : 
    2609             : #endif /* CONFIG_FILE_LOCKING */
    2610             : 
    2611             : /* fs/open.c */
    2612             : struct audit_names;
    2613             : struct filename {
    2614             :         const char              *name;  /* pointer to actual string */
    2615             :         const __user char       *uptr;  /* original userland pointer */
    2616             :         int                     refcnt;
    2617             :         struct audit_names      *aname;
    2618             :         const char              iname[];
    2619             : };
    2620             : static_assert(offsetof(struct filename, iname) % sizeof(long) == 0);
    2621             : 
    2622        3884 : static inline struct user_namespace *file_mnt_user_ns(struct file *file)
    2623             : {
    2624        3540 :         return mnt_user_ns(file->f_path.mnt);
    2625             : }
    2626             : extern long vfs_truncate(const struct path *, loff_t);
    2627             : int do_truncate(struct user_namespace *, struct dentry *, loff_t start,
    2628             :                 unsigned int time_attrs, struct file *filp);
    2629             : extern int vfs_fallocate(struct file *file, int mode, loff_t offset,
    2630             :                         loff_t len);
    2631             : extern long do_sys_open(int dfd, const char __user *filename, int flags,
    2632             :                         umode_t mode);
    2633             : extern struct file *file_open_name(struct filename *, int, umode_t);
    2634             : extern struct file *filp_open(const char *, int, umode_t);
    2635             : extern struct file *file_open_root(struct dentry *, struct vfsmount *,
    2636             :                                    const char *, int, umode_t);
    2637             : extern struct file * dentry_open(const struct path *, int, const struct cred *);
    2638             : extern struct file * open_with_fake_path(const struct path *, int,
    2639             :                                          struct inode*, const struct cred *);
    2640             : static inline struct file *file_clone_open(struct file *file)
    2641             : {
    2642             :         return dentry_open(&file->f_path, file->f_flags, file->f_cred);
    2643             : }
    2644             : extern int filp_close(struct file *, fl_owner_t id);
    2645             : 
    2646             : extern struct filename *getname_flags(const char __user *, int, int *);
    2647             : extern struct filename *getname(const char __user *);
    2648             : extern struct filename *getname_kernel(const char *);
    2649             : extern void putname(struct filename *name);
    2650             : 
    2651             : extern int finish_open(struct file *file, struct dentry *dentry,
    2652             :                         int (*open)(struct inode *, struct file *));
    2653             : extern int finish_no_open(struct file *file, struct dentry *dentry);
    2654             : 
    2655             : /* fs/dcache.c */
    2656             : extern void __init vfs_caches_init_early(void);
    2657             : extern void __init vfs_caches_init(void);
    2658             : 
    2659             : extern struct kmem_cache *names_cachep;
    2660             : 
    2661             : #define __getname()             kmem_cache_alloc(names_cachep, GFP_KERNEL)
    2662             : #define __putname(name)         kmem_cache_free(names_cachep, (void *)(name))
    2663             : 
    2664             : extern struct super_block *blockdev_superblock;
    2665       42258 : static inline bool sb_is_blkdev_sb(struct super_block *sb)
    2666             : {
    2667       42258 :         return IS_ENABLED(CONFIG_BLOCK) && sb == blockdev_superblock;
    2668             : }
    2669             : 
    2670             : void emergency_thaw_all(void);
    2671             : extern int sync_filesystem(struct super_block *);
    2672             : extern const struct file_operations def_blk_fops;
    2673             : extern const struct file_operations def_chr_fops;
    2674             : 
    2675             : /* fs/char_dev.c */
    2676             : #define CHRDEV_MAJOR_MAX 512
    2677             : /* Marks the bottom of the first segment of free char majors */
    2678             : #define CHRDEV_MAJOR_DYN_END 234
    2679             : /* Marks the top and bottom of the second segment of free char majors */
    2680             : #define CHRDEV_MAJOR_DYN_EXT_START 511
    2681             : #define CHRDEV_MAJOR_DYN_EXT_END 384
    2682             : 
    2683             : extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *);
    2684             : extern int register_chrdev_region(dev_t, unsigned, const char *);
    2685             : extern int __register_chrdev(unsigned int major, unsigned int baseminor,
    2686             :                              unsigned int count, const char *name,
    2687             :                              const struct file_operations *fops);
    2688             : extern void __unregister_chrdev(unsigned int major, unsigned int baseminor,
    2689             :                                 unsigned int count, const char *name);
    2690             : extern void unregister_chrdev_region(dev_t, unsigned);
    2691             : extern void chrdev_show(struct seq_file *,off_t);
    2692             : 
    2693           3 : static inline int register_chrdev(unsigned int major, const char *name,
    2694             :                                   const struct file_operations *fops)
    2695             : {
    2696           3 :         return __register_chrdev(major, 0, 256, name, fops);
    2697             : }
    2698             : 
    2699           0 : static inline void unregister_chrdev(unsigned int major, const char *name)
    2700             : {
    2701           0 :         __unregister_chrdev(major, 0, 256, name);
    2702           0 : }
    2703             : 
    2704             : extern void init_special_inode(struct inode *, umode_t, dev_t);
    2705             : 
    2706             : /* Invalid inode operations -- fs/bad_inode.c */
    2707             : extern void make_bad_inode(struct inode *);
    2708             : extern bool is_bad_inode(struct inode *);
    2709             : 
    2710             : unsigned long invalidate_mapping_pages(struct address_space *mapping,
    2711             :                                         pgoff_t start, pgoff_t end);
    2712             : 
    2713             : void invalidate_mapping_pagevec(struct address_space *mapping,
    2714             :                                 pgoff_t start, pgoff_t end,
    2715             :                                 unsigned long *nr_pagevec);
    2716             : 
    2717             : static inline void invalidate_remote_inode(struct inode *inode)
    2718             : {
    2719             :         if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
    2720             :             S_ISLNK(inode->i_mode))
    2721             :                 invalidate_mapping_pages(inode->i_mapping, 0, -1);
    2722             : }
    2723             : extern int invalidate_inode_pages2(struct address_space *mapping);
    2724             : extern int invalidate_inode_pages2_range(struct address_space *mapping,
    2725             :                                          pgoff_t start, pgoff_t end);
    2726             : extern int write_inode_now(struct inode *, int);
    2727             : extern int filemap_fdatawrite(struct address_space *);
    2728             : extern int filemap_flush(struct address_space *);
    2729             : extern int filemap_fdatawait_keep_errors(struct address_space *mapping);
    2730             : extern int filemap_fdatawait_range(struct address_space *, loff_t lstart,
    2731             :                                    loff_t lend);
    2732             : extern int filemap_fdatawait_range_keep_errors(struct address_space *mapping,
    2733             :                 loff_t start_byte, loff_t end_byte);
    2734             : 
    2735           0 : static inline int filemap_fdatawait(struct address_space *mapping)
    2736             : {
    2737           0 :         return filemap_fdatawait_range(mapping, 0, LLONG_MAX);
    2738             : }
    2739             : 
    2740             : extern bool filemap_range_has_page(struct address_space *, loff_t lstart,
    2741             :                                   loff_t lend);
    2742             : extern int filemap_write_and_wait_range(struct address_space *mapping,
    2743             :                                         loff_t lstart, loff_t lend);
    2744             : extern int __filemap_fdatawrite_range(struct address_space *mapping,
    2745             :                                 loff_t start, loff_t end, int sync_mode);
    2746             : extern int filemap_fdatawrite_range(struct address_space *mapping,
    2747             :                                 loff_t start, loff_t end);
    2748             : extern int filemap_check_errors(struct address_space *mapping);
    2749             : extern void __filemap_set_wb_err(struct address_space *mapping, int err);
    2750             : 
    2751        1975 : static inline int filemap_write_and_wait(struct address_space *mapping)
    2752             : {
    2753        1975 :         return filemap_write_and_wait_range(mapping, 0, LLONG_MAX);
    2754             : }
    2755             : 
    2756             : extern int __must_check file_fdatawait_range(struct file *file, loff_t lstart,
    2757             :                                                 loff_t lend);
    2758             : extern int __must_check file_check_and_advance_wb_err(struct file *file);
    2759             : extern int __must_check file_write_and_wait_range(struct file *file,
    2760             :                                                 loff_t start, loff_t end);
    2761             : 
    2762             : static inline int file_write_and_wait(struct file *file)
    2763             : {
    2764             :         return file_write_and_wait_range(file, 0, LLONG_MAX);
    2765             : }
    2766             : 
    2767             : /**
    2768             :  * filemap_set_wb_err - set a writeback error on an address_space
    2769             :  * @mapping: mapping in which to set writeback error
    2770             :  * @err: error to be set in mapping
    2771             :  *
    2772             :  * When writeback fails in some way, we must record that error so that
    2773             :  * userspace can be informed when fsync and the like are called.  We endeavor
    2774             :  * to report errors on any file that was open at the time of the error.  Some
    2775             :  * internal callers also need to know when writeback errors have occurred.
    2776             :  *
    2777             :  * When a writeback error occurs, most filesystems will want to call
    2778             :  * filemap_set_wb_err to record the error in the mapping so that it will be
    2779             :  * automatically reported whenever fsync is called on the file.
    2780             :  */
    2781             : static inline void filemap_set_wb_err(struct address_space *mapping, int err)
    2782             : {
    2783             :         /* Fastpath for common case of no error */
    2784             :         if (unlikely(err))
    2785             :                 __filemap_set_wb_err(mapping, err);
    2786             : }
    2787             : 
    2788             : /**
    2789             :  * filemap_check_wb_err - has an error occurred since the mark was sampled?
    2790             :  * @mapping: mapping to check for writeback errors
    2791             :  * @since: previously-sampled errseq_t
    2792             :  *
    2793             :  * Grab the errseq_t value from the mapping, and see if it has changed "since"
    2794             :  * the given value was sampled.
    2795             :  *
    2796             :  * If it has then report the latest error set, otherwise return 0.
    2797             :  */
    2798             : static inline int filemap_check_wb_err(struct address_space *mapping,
    2799             :                                         errseq_t since)
    2800             : {
    2801             :         return errseq_check(&mapping->wb_err, since);
    2802             : }
    2803             : 
    2804             : /**
    2805             :  * filemap_sample_wb_err - sample the current errseq_t to test for later errors
    2806             :  * @mapping: mapping to be sampled
    2807             :  *
    2808             :  * Writeback errors are always reported relative to a particular sample point
    2809             :  * in the past. This function provides those sample points.
    2810             :  */
    2811       47308 : static inline errseq_t filemap_sample_wb_err(struct address_space *mapping)
    2812             : {
    2813       47308 :         return errseq_sample(&mapping->wb_err);
    2814             : }
    2815             : 
    2816             : /**
    2817             :  * file_sample_sb_err - sample the current errseq_t to test for later errors
    2818             :  * @file: file pointer to be sampled
    2819             :  *
    2820             :  * Grab the most current superblock-level errseq_t value for the given
    2821             :  * struct file.
    2822             :  */
    2823       47280 : static inline errseq_t file_sample_sb_err(struct file *file)
    2824             : {
    2825       47280 :         return errseq_sample(&file->f_path.dentry->d_sb->s_wb_err);
    2826             : }
    2827             : 
    2828             : extern int vfs_fsync_range(struct file *file, loff_t start, loff_t end,
    2829             :                            int datasync);
    2830             : extern int vfs_fsync(struct file *file, int datasync);
    2831             : 
    2832             : extern int sync_file_range(struct file *file, loff_t offset, loff_t nbytes,
    2833             :                                 unsigned int flags);
    2834             : 
    2835             : /*
    2836             :  * Sync the bytes written if this was a synchronous write.  Expect ki_pos
    2837             :  * to already be updated for the write, and will return either the amount
    2838             :  * of bytes passed in, or an error if syncing the file failed.
    2839             :  */
    2840        1535 : static inline ssize_t generic_write_sync(struct kiocb *iocb, ssize_t count)
    2841             : {
    2842        1535 :         if (iocb->ki_flags & IOCB_DSYNC) {
    2843           0 :                 int ret = vfs_fsync_range(iocb->ki_filp,
    2844           0 :                                 iocb->ki_pos - count, iocb->ki_pos - 1,
    2845           0 :                                 (iocb->ki_flags & IOCB_SYNC) ? 0 : 1);
    2846           0 :                 if (ret)
    2847           0 :                         return ret;
    2848             :         }
    2849             : 
    2850             :         return count;
    2851             : }
    2852             : 
    2853             : extern void emergency_sync(void);
    2854             : extern void emergency_remount(void);
    2855             : 
    2856             : #ifdef CONFIG_BLOCK
    2857             : extern int bmap(struct inode *inode, sector_t *block);
    2858             : #else
    2859             : static inline int bmap(struct inode *inode,  sector_t *block)
    2860             : {
    2861             :         return -EINVAL;
    2862             : }
    2863             : #endif
    2864             : 
    2865             : int notify_change(struct user_namespace *, struct dentry *,
    2866             :                   struct iattr *, struct inode **);
    2867             : int inode_permission(struct user_namespace *, struct inode *, int);
    2868             : int generic_permission(struct user_namespace *, struct inode *, int);
    2869         344 : static inline int file_permission(struct file *file, int mask)
    2870             : {
    2871         344 :         return inode_permission(file_mnt_user_ns(file),
    2872             :                                 file_inode(file), mask);
    2873             : }
    2874        1937 : static inline int path_permission(const struct path *path, int mask)
    2875             : {
    2876        1937 :         return inode_permission(mnt_user_ns(path->mnt),
    2877        1937 :                                 d_inode(path->dentry), mask);
    2878             : }
    2879             : int __check_sticky(struct user_namespace *mnt_userns, struct inode *dir,
    2880             :                    struct inode *inode);
    2881             : 
    2882             : static inline bool execute_ok(struct inode *inode)
    2883             : {
    2884             :         return (inode->i_mode & S_IXUGO) || S_ISDIR(inode->i_mode);
    2885             : }
    2886             : 
    2887       11642 : static inline void file_start_write(struct file *file)
    2888             : {
    2889       11642 :         if (!S_ISREG(file_inode(file)->i_mode))
    2890             :                 return;
    2891        1933 :         sb_start_write(file_inode(file)->i_sb);
    2892             : }
    2893             : 
    2894             : static inline bool file_start_write_trylock(struct file *file)
    2895             : {
    2896             :         if (!S_ISREG(file_inode(file)->i_mode))
    2897             :                 return true;
    2898             :         return sb_start_write_trylock(file_inode(file)->i_sb);
    2899             : }
    2900             : 
    2901       11642 : static inline void file_end_write(struct file *file)
    2902             : {
    2903       11642 :         if (!S_ISREG(file_inode(file)->i_mode))
    2904             :                 return;
    2905        1933 :         __sb_end_write(file_inode(file)->i_sb, SB_FREEZE_WRITE);
    2906             : }
    2907             : 
    2908             : /*
    2909             :  * get_write_access() gets write permission for a file.
    2910             :  * put_write_access() releases this write permission.
    2911             :  * This is used for regular files.
    2912             :  * We cannot support write (and maybe mmap read-write shared) accesses and
    2913             :  * MAP_DENYWRITE mmappings simultaneously. The i_writecount field of an inode
    2914             :  * can have the following values:
    2915             :  * 0: no writers, no VM_DENYWRITE mappings
    2916             :  * < 0: (-i_writecount) vm_area_structs with VM_DENYWRITE set exist
    2917             :  * > 0: (i_writecount) users are writing to the file.
    2918             :  *
    2919             :  * Normally we operate on that counter with atomic_{inc,dec} and it's safe
    2920             :  * except for the cases where we don't hold i_writecount yet. Then we need to
    2921             :  * use {get,deny}_write_access() - these functions check the sign and refuse
    2922             :  * to do the change if sign is wrong.
    2923             :  */
    2924        1244 : static inline int get_write_access(struct inode *inode)
    2925             : {
    2926        2488 :         return atomic_inc_unless_negative(&inode->i_writecount) ? 0 : -ETXTBSY;
    2927             : }
    2928        9576 : static inline int deny_write_access(struct file *file)
    2929             : {
    2930        9576 :         struct inode *inode = file_inode(file);
    2931       19152 :         return atomic_dec_unless_positive(&inode->i_writecount) ? 0 : -ETXTBSY;
    2932             : }
    2933       21045 : static inline void put_write_access(struct inode * inode)
    2934             : {
    2935       21045 :         atomic_dec(&inode->i_writecount);
    2936       21045 : }
    2937       33124 : static inline void allow_write_access(struct file *file)
    2938             : {
    2939       33124 :         if (file)
    2940       33124 :                 atomic_inc(&file_inode(file)->i_writecount);
    2941       33124 : }
    2942         133 : static inline bool inode_is_open_for_write(const struct inode *inode)
    2943             : {
    2944         133 :         return atomic_read(&inode->i_writecount) > 0;
    2945             : }
    2946             : 
    2947             : #if defined(CONFIG_IMA) || defined(CONFIG_FILE_LOCKING)
    2948       13800 : static inline void i_readcount_dec(struct inode *inode)
    2949             : {
    2950       13800 :         BUG_ON(!atomic_read(&inode->i_readcount));
    2951       13800 :         atomic_dec(&inode->i_readcount);
    2952       13800 : }
    2953       14220 : static inline void i_readcount_inc(struct inode *inode)
    2954             : {
    2955       14220 :         atomic_inc(&inode->i_readcount);
    2956       14221 : }
    2957             : #else
    2958             : static inline void i_readcount_dec(struct inode *inode)
    2959             : {
    2960             :         return;
    2961             : }
    2962             : static inline void i_readcount_inc(struct inode *inode)
    2963             : {
    2964             :         return;
    2965             : }
    2966             : #endif
    2967             : extern int do_pipe_flags(int *, int);
    2968             : 
    2969             : extern ssize_t kernel_read(struct file *, void *, size_t, loff_t *);
    2970             : ssize_t __kernel_read(struct file *file, void *buf, size_t count, loff_t *pos);
    2971             : extern ssize_t kernel_write(struct file *, const void *, size_t, loff_t *);
    2972             : extern ssize_t __kernel_write(struct file *, const void *, size_t, loff_t *);
    2973             : extern struct file * open_exec(const char *);
    2974             :  
    2975             : /* fs/dcache.c -- generic fs support functions */
    2976             : extern bool is_subdir(struct dentry *, struct dentry *);
    2977             : extern bool path_is_under(const struct path *, const struct path *);
    2978             : 
    2979             : extern char *file_path(struct file *, char *, int);
    2980             : 
    2981             : #include <linux/err.h>
    2982             : 
    2983             : /* needed for stackable file system support */
    2984             : extern loff_t default_llseek(struct file *file, loff_t offset, int whence);
    2985             : 
    2986             : extern loff_t vfs_llseek(struct file *file, loff_t offset, int whence);
    2987             : 
    2988             : extern int inode_init_always(struct super_block *, struct inode *);
    2989             : extern void inode_init_once(struct inode *);
    2990             : extern void address_space_init_once(struct address_space *mapping);
    2991             : extern struct inode * igrab(struct inode *);
    2992             : extern ino_t iunique(struct super_block *, ino_t);
    2993             : extern int inode_needs_sync(struct inode *inode);
    2994             : extern int generic_delete_inode(struct inode *inode);
    2995        1527 : static inline int generic_drop_inode(struct inode *inode)
    2996             : {
    2997        1527 :         return !inode->i_nlink || inode_unhashed(inode);
    2998             : }
    2999             : extern void d_mark_dontcache(struct inode *inode);
    3000             : 
    3001             : extern struct inode *ilookup5_nowait(struct super_block *sb,
    3002             :                 unsigned long hashval, int (*test)(struct inode *, void *),
    3003             :                 void *data);
    3004             : extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval,
    3005             :                 int (*test)(struct inode *, void *), void *data);
    3006             : extern struct inode *ilookup(struct super_block *sb, unsigned long ino);
    3007             : 
    3008             : extern struct inode *inode_insert5(struct inode *inode, unsigned long hashval,
    3009             :                 int (*test)(struct inode *, void *),
    3010             :                 int (*set)(struct inode *, void *),
    3011             :                 void *data);
    3012             : extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *);
    3013             : extern struct inode * iget_locked(struct super_block *, unsigned long);
    3014             : extern struct inode *find_inode_nowait(struct super_block *,
    3015             :                                        unsigned long,
    3016             :                                        int (*match)(struct inode *,
    3017             :                                                     unsigned long, void *),
    3018             :                                        void *data);
    3019             : extern struct inode *find_inode_rcu(struct super_block *, unsigned long,
    3020             :                                     int (*)(struct inode *, void *), void *);
    3021             : extern struct inode *find_inode_by_ino_rcu(struct super_block *, unsigned long);
    3022             : extern int insert_inode_locked4(struct inode *, unsigned long, int (*test)(struct inode *, void *), void *);
    3023             : extern int insert_inode_locked(struct inode *);
    3024             : #ifdef CONFIG_DEBUG_LOCK_ALLOC
    3025             : extern void lockdep_annotate_inode_mutex_key(struct inode *inode);
    3026             : #else
    3027             : static inline void lockdep_annotate_inode_mutex_key(struct inode *inode) { };
    3028             : #endif
    3029             : extern void unlock_new_inode(struct inode *);
    3030             : extern void discard_new_inode(struct inode *);
    3031             : extern unsigned int get_next_ino(void);
    3032             : extern void evict_inodes(struct super_block *sb);
    3033             : 
    3034             : /*
    3035             :  * Userspace may rely on the the inode number being non-zero. For example, glibc
    3036             :  * simply ignores files with zero i_ino in unlink() and other places.
    3037             :  *
    3038             :  * As an additional complication, if userspace was compiled with
    3039             :  * _FILE_OFFSET_BITS=32 on a 64-bit kernel we'll only end up reading out the
    3040             :  * lower 32 bits, so we need to check that those aren't zero explicitly. With
    3041             :  * _FILE_OFFSET_BITS=64, this may cause some harmless false-negatives, but
    3042             :  * better safe than sorry.
    3043             :  */
    3044        1741 : static inline bool is_zero_ino(ino_t ino)
    3045             : {
    3046        1741 :         return (u32)ino == 0;
    3047             : }
    3048             : 
    3049             : extern void __iget(struct inode * inode);
    3050             : extern void iget_failed(struct inode *);
    3051             : extern void clear_inode(struct inode *);
    3052             : extern void __destroy_inode(struct inode *);
    3053             : extern struct inode *new_inode_pseudo(struct super_block *sb);
    3054             : extern struct inode *new_inode(struct super_block *sb);
    3055             : extern void free_inode_nonrcu(struct inode *inode);
    3056             : extern int should_remove_suid(struct dentry *);
    3057             : extern int file_remove_privs(struct file *);
    3058             : 
    3059             : extern void __insert_inode_hash(struct inode *, unsigned long hashval);
    3060          10 : static inline void insert_inode_hash(struct inode *inode)
    3061             : {
    3062          10 :         __insert_inode_hash(inode, inode->i_ino);
    3063             : }
    3064             : 
    3065             : extern void __remove_inode_hash(struct inode *);
    3066        5288 : static inline void remove_inode_hash(struct inode *inode)
    3067             : {
    3068        5288 :         if (!inode_unhashed(inode) && !hlist_fake(&inode->i_hash))
    3069         683 :                 __remove_inode_hash(inode);
    3070        5288 : }
    3071             : 
    3072             : extern void inode_sb_list_add(struct inode *inode);
    3073             : 
    3074             : extern int sb_set_blocksize(struct super_block *, int);
    3075             : extern int sb_min_blocksize(struct super_block *, int);
    3076             : 
    3077             : extern int generic_file_mmap(struct file *, struct vm_area_struct *);
    3078             : extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *);
    3079             : extern ssize_t generic_write_checks(struct kiocb *, struct iov_iter *);
    3080             : extern int generic_write_check_limits(struct file *file, loff_t pos,
    3081             :                 loff_t *count);
    3082             : extern int generic_file_rw_checks(struct file *file_in, struct file *file_out);
    3083             : ssize_t filemap_read(struct kiocb *iocb, struct iov_iter *to,
    3084             :                 ssize_t already_read);
    3085             : extern ssize_t generic_file_read_iter(struct kiocb *, struct iov_iter *);
    3086             : extern ssize_t __generic_file_write_iter(struct kiocb *, struct iov_iter *);
    3087             : extern ssize_t generic_file_write_iter(struct kiocb *, struct iov_iter *);
    3088             : extern ssize_t generic_file_direct_write(struct kiocb *, struct iov_iter *);
    3089             : extern ssize_t generic_perform_write(struct file *, struct iov_iter *, loff_t);
    3090             : 
    3091             : ssize_t vfs_iter_read(struct file *file, struct iov_iter *iter, loff_t *ppos,
    3092             :                 rwf_t flags);
    3093             : ssize_t vfs_iter_write(struct file *file, struct iov_iter *iter, loff_t *ppos,
    3094             :                 rwf_t flags);
    3095             : ssize_t vfs_iocb_iter_read(struct file *file, struct kiocb *iocb,
    3096             :                            struct iov_iter *iter);
    3097             : ssize_t vfs_iocb_iter_write(struct file *file, struct kiocb *iocb,
    3098             :                             struct iov_iter *iter);
    3099             : 
    3100             : /* fs/block_dev.c */
    3101             : extern ssize_t blkdev_read_iter(struct kiocb *iocb, struct iov_iter *to);
    3102             : extern ssize_t blkdev_write_iter(struct kiocb *iocb, struct iov_iter *from);
    3103             : extern int blkdev_fsync(struct file *filp, loff_t start, loff_t end,
    3104             :                         int datasync);
    3105             : extern void block_sync_page(struct page *page);
    3106             : 
    3107             : /* fs/splice.c */
    3108             : extern ssize_t generic_file_splice_read(struct file *, loff_t *,
    3109             :                 struct pipe_inode_info *, size_t, unsigned int);
    3110             : extern ssize_t iter_file_splice_write(struct pipe_inode_info *,
    3111             :                 struct file *, loff_t *, size_t, unsigned int);
    3112             : extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe,
    3113             :                 struct file *out, loff_t *, size_t len, unsigned int flags);
    3114             : extern long do_splice_direct(struct file *in, loff_t *ppos, struct file *out,
    3115             :                 loff_t *opos, size_t len, unsigned int flags);
    3116             : 
    3117             : 
    3118             : extern void
    3119             : file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping);
    3120             : extern loff_t noop_llseek(struct file *file, loff_t offset, int whence);
    3121             : extern loff_t no_llseek(struct file *file, loff_t offset, int whence);
    3122             : extern loff_t vfs_setpos(struct file *file, loff_t offset, loff_t maxsize);
    3123             : extern loff_t generic_file_llseek(struct file *file, loff_t offset, int whence);
    3124             : extern loff_t generic_file_llseek_size(struct file *file, loff_t offset,
    3125             :                 int whence, loff_t maxsize, loff_t eof);
    3126             : extern loff_t fixed_size_llseek(struct file *file, loff_t offset,
    3127             :                 int whence, loff_t size);
    3128             : extern loff_t no_seek_end_llseek_size(struct file *, loff_t, int, loff_t);
    3129             : extern loff_t no_seek_end_llseek(struct file *, loff_t, int);
    3130             : extern int generic_file_open(struct inode * inode, struct file * filp);
    3131             : extern int nonseekable_open(struct inode * inode, struct file * filp);
    3132             : extern int stream_open(struct inode * inode, struct file * filp);
    3133             : 
    3134             : #ifdef CONFIG_BLOCK
    3135             : typedef void (dio_submit_t)(struct bio *bio, struct inode *inode,
    3136             :                             loff_t file_offset);
    3137             : 
    3138             : enum {
    3139             :         /* need locking between buffered and direct access */
    3140             :         DIO_LOCKING     = 0x01,
    3141             : 
    3142             :         /* filesystem does not support filling holes */
    3143             :         DIO_SKIP_HOLES  = 0x02,
    3144             : };
    3145             : 
    3146             : ssize_t __blockdev_direct_IO(struct kiocb *iocb, struct inode *inode,
    3147             :                              struct block_device *bdev, struct iov_iter *iter,
    3148             :                              get_block_t get_block,
    3149             :                              dio_iodone_t end_io, dio_submit_t submit_io,
    3150             :                              int flags);
    3151             : 
    3152             : static inline ssize_t blockdev_direct_IO(struct kiocb *iocb,
    3153             :                                          struct inode *inode,
    3154             :                                          struct iov_iter *iter,
    3155             :                                          get_block_t get_block)
    3156             : {
    3157             :         return __blockdev_direct_IO(iocb, inode, inode->i_sb->s_bdev, iter,
    3158             :                         get_block, NULL, NULL, DIO_LOCKING | DIO_SKIP_HOLES);
    3159             : }
    3160             : #endif
    3161             : 
    3162             : void inode_dio_wait(struct inode *inode);
    3163             : 
    3164             : /*
    3165             :  * inode_dio_begin - signal start of a direct I/O requests
    3166             :  * @inode: inode the direct I/O happens on
    3167             :  *
    3168             :  * This is called once we've finished processing a direct I/O request,
    3169             :  * and is used to wake up callers waiting for direct I/O to be quiesced.
    3170             :  */
    3171           0 : static inline void inode_dio_begin(struct inode *inode)
    3172             : {
    3173           0 :         atomic_inc(&inode->i_dio_count);
    3174           0 : }
    3175             : 
    3176             : /*
    3177             :  * inode_dio_end - signal finish of a direct I/O requests
    3178             :  * @inode: inode the direct I/O happens on
    3179             :  *
    3180             :  * This is called once we've finished processing a direct I/O request,
    3181             :  * and is used to wake up callers waiting for direct I/O to be quiesced.
    3182             :  */
    3183           0 : static inline void inode_dio_end(struct inode *inode)
    3184             : {
    3185           0 :         if (atomic_dec_and_test(&inode->i_dio_count))
    3186           0 :                 wake_up_bit(&inode->i_state, __I_DIO_WAKEUP);
    3187           0 : }
    3188             : 
    3189             : /*
    3190             :  * Warn about a page cache invalidation failure diring a direct I/O write.
    3191             :  */
    3192             : void dio_warn_stale_pagecache(struct file *filp);
    3193             : 
    3194             : extern void inode_set_flags(struct inode *inode, unsigned int flags,
    3195             :                             unsigned int mask);
    3196             : 
    3197             : extern const struct file_operations generic_ro_fops;
    3198             : 
    3199             : #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))
    3200             : 
    3201             : extern int readlink_copy(char __user *, int, const char *);
    3202             : extern int page_readlink(struct dentry *, char __user *, int);
    3203             : extern const char *page_get_link(struct dentry *, struct inode *,
    3204             :                                  struct delayed_call *);
    3205             : extern void page_put_link(void *);
    3206             : extern int __page_symlink(struct inode *inode, const char *symname, int len,
    3207             :                 int nofs);
    3208             : extern int page_symlink(struct inode *inode, const char *symname, int len);
    3209             : extern const struct inode_operations page_symlink_inode_operations;
    3210             : extern void kfree_link(void *);
    3211             : void generic_fillattr(struct user_namespace *, struct inode *, struct kstat *);
    3212             : extern int vfs_getattr_nosec(const struct path *, struct kstat *, u32, unsigned int);
    3213             : extern int vfs_getattr(const struct path *, struct kstat *, u32, unsigned int);
    3214             : void __inode_add_bytes(struct inode *inode, loff_t bytes);
    3215             : void inode_add_bytes(struct inode *inode, loff_t bytes);
    3216             : void __inode_sub_bytes(struct inode *inode, loff_t bytes);
    3217             : void inode_sub_bytes(struct inode *inode, loff_t bytes);
    3218           0 : static inline loff_t __inode_get_bytes(struct inode *inode)
    3219             : {
    3220           0 :         return (((loff_t)inode->i_blocks) << 9) + inode->i_bytes;
    3221             : }
    3222             : loff_t inode_get_bytes(struct inode *inode);
    3223             : void inode_set_bytes(struct inode *inode, loff_t bytes);
    3224             : const char *simple_get_link(struct dentry *, struct inode *,
    3225             :                             struct delayed_call *);
    3226             : extern const struct inode_operations simple_symlink_inode_operations;
    3227             : 
    3228             : extern int iterate_dir(struct file *, struct dir_context *);
    3229             : 
    3230             : int vfs_fstatat(int dfd, const char __user *filename, struct kstat *stat,
    3231             :                 int flags);
    3232             : int vfs_fstat(int fd, struct kstat *stat);
    3233             : 
    3234       10962 : static inline int vfs_stat(const char __user *filename, struct kstat *stat)
    3235             : {
    3236       10962 :         return vfs_fstatat(AT_FDCWD, filename, stat, 0);
    3237             : }
    3238        1800 : static inline int vfs_lstat(const char __user *name, struct kstat *stat)
    3239             : {
    3240        1800 :         return vfs_fstatat(AT_FDCWD, name, stat, AT_SYMLINK_NOFOLLOW);
    3241             : }
    3242             : 
    3243             : extern const char *vfs_get_link(struct dentry *, struct delayed_call *);
    3244             : extern int vfs_readlink(struct dentry *, char __user *, int);
    3245             : 
    3246             : extern struct file_system_type *get_filesystem(struct file_system_type *fs);
    3247             : extern void put_filesystem(struct file_system_type *fs);
    3248             : extern struct file_system_type *get_fs_type(const char *name);
    3249             : extern struct super_block *get_super(struct block_device *);
    3250             : extern struct super_block *get_active_super(struct block_device *bdev);
    3251             : extern void drop_super(struct super_block *sb);
    3252             : extern void drop_super_exclusive(struct super_block *sb);
    3253             : extern void iterate_supers(void (*)(struct super_block *, void *), void *);
    3254             : extern void iterate_supers_type(struct file_system_type *,
    3255             :                                 void (*)(struct super_block *, void *), void *);
    3256             : 
    3257             : extern int dcache_dir_open(struct inode *, struct file *);
    3258             : extern int dcache_dir_close(struct inode *, struct file *);
    3259             : extern loff_t dcache_dir_lseek(struct file *, loff_t, int);
    3260             : extern int dcache_readdir(struct file *, struct dir_context *);
    3261             : extern int simple_setattr(struct user_namespace *, struct dentry *,
    3262             :                           struct iattr *);
    3263             : extern int simple_getattr(struct user_namespace *, const struct path *,
    3264             :                           struct kstat *, u32, unsigned int);
    3265             : extern int simple_statfs(struct dentry *, struct kstatfs *);
    3266             : extern int simple_open(struct inode *inode, struct file *file);
    3267             : extern int simple_link(struct dentry *, struct inode *, struct dentry *);
    3268             : extern int simple_unlink(struct inode *, struct dentry *);
    3269             : extern int simple_rmdir(struct inode *, struct dentry *);
    3270             : extern int simple_rename(struct user_namespace *, struct inode *,
    3271             :                          struct dentry *, struct inode *, struct dentry *,
    3272             :                          unsigned int);
    3273             : extern void simple_recursive_removal(struct dentry *,
    3274             :                               void (*callback)(struct dentry *));
    3275             : extern int noop_fsync(struct file *, loff_t, loff_t, int);
    3276             : extern int noop_set_page_dirty(struct page *page);
    3277             : extern void noop_invalidatepage(struct page *page, unsigned int offset,
    3278             :                 unsigned int length);
    3279             : extern ssize_t noop_direct_IO(struct kiocb *iocb, struct iov_iter *iter);
    3280             : extern int simple_empty(struct dentry *);
    3281             : extern int simple_readpage(struct file *file, struct page *page);
    3282             : extern int simple_write_begin(struct file *file, struct address_space *mapping,
    3283             :                         loff_t pos, unsigned len, unsigned flags,
    3284             :                         struct page **pagep, void **fsdata);
    3285             : extern int simple_write_end(struct file *file, struct address_space *mapping,
    3286             :                         loff_t pos, unsigned len, unsigned copied,
    3287             :                         struct page *page, void *fsdata);
    3288             : extern int always_delete_dentry(const struct dentry *);
    3289             : extern struct inode *alloc_anon_inode(struct super_block *);
    3290             : extern int simple_nosetlease(struct file *, long, struct file_lock **, void **);
    3291             : extern const struct dentry_operations simple_dentry_operations;
    3292             : 
    3293             : extern struct dentry *simple_lookup(struct inode *, struct dentry *, unsigned int flags);
    3294             : extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *);
    3295             : extern const struct file_operations simple_dir_operations;
    3296             : extern const struct inode_operations simple_dir_inode_operations;
    3297             : extern void make_empty_dir_inode(struct inode *inode);
    3298             : extern bool is_empty_dir_inode(struct inode *inode);
    3299             : struct tree_descr { const char *name; const struct file_operations *ops; int mode; };
    3300             : struct dentry *d_alloc_name(struct dentry *, const char *);
    3301             : extern int simple_fill_super(struct super_block *, unsigned long,
    3302             :                              const struct tree_descr *);
    3303             : extern int simple_pin_fs(struct file_system_type *, struct vfsmount **mount, int *count);
    3304             : extern void simple_release_fs(struct vfsmount **mount, int *count);
    3305             : 
    3306             : extern ssize_t simple_read_from_buffer(void __user *to, size_t count,
    3307             :                         loff_t *ppos, const void *from, size_t available);
    3308             : extern ssize_t simple_write_to_buffer(void *to, size_t available, loff_t *ppos,
    3309             :                 const void __user *from, size_t count);
    3310             : 
    3311             : extern int __generic_file_fsync(struct file *, loff_t, loff_t, int);
    3312             : extern int generic_file_fsync(struct file *, loff_t, loff_t, int);
    3313             : 
    3314             : extern int generic_check_addressable(unsigned, u64);
    3315             : 
    3316             : extern void generic_set_encrypted_ci_d_ops(struct dentry *dentry);
    3317             : 
    3318             : #ifdef CONFIG_MIGRATION
    3319             : extern int buffer_migrate_page(struct address_space *,
    3320             :                                 struct page *, struct page *,
    3321             :                                 enum migrate_mode);
    3322             : extern int buffer_migrate_page_norefs(struct address_space *,
    3323             :                                 struct page *, struct page *,
    3324             :                                 enum migrate_mode);
    3325             : #else
    3326             : #define buffer_migrate_page NULL
    3327             : #define buffer_migrate_page_norefs NULL
    3328             : #endif
    3329             : 
    3330             : int setattr_prepare(struct user_namespace *, struct dentry *, struct iattr *);
    3331             : extern int inode_newsize_ok(const struct inode *, loff_t offset);
    3332             : void setattr_copy(struct user_namespace *, struct inode *inode,
    3333             :                   const struct iattr *attr);
    3334             : 
    3335             : extern int file_update_time(struct file *file);
    3336             : 
    3337          18 : static inline bool vma_is_dax(const struct vm_area_struct *vma)
    3338             : {
    3339          18 :         return vma->vm_file && IS_DAX(vma->vm_file->f_mapping->host);
    3340             : }
    3341             : 
    3342             : static inline bool vma_is_fsdax(struct vm_area_struct *vma)
    3343             : {
    3344             :         struct inode *inode;
    3345             : 
    3346             :         if (!IS_ENABLED(CONFIG_FS_DAX) || !vma->vm_file)
    3347             :                 return false;
    3348             :         if (!vma_is_dax(vma))
    3349             :                 return false;
    3350             :         inode = file_inode(vma->vm_file);
    3351             :         if (S_ISCHR(inode->i_mode))
    3352             :                 return false; /* device-dax */
    3353             :         return true;
    3354             : }
    3355             : 
    3356       40791 : static inline int iocb_flags(struct file *file)
    3357             : {
    3358       40791 :         int res = 0;
    3359       40791 :         if (file->f_flags & O_APPEND)
    3360        8613 :                 res |= IOCB_APPEND;
    3361       40791 :         if (file->f_flags & O_DIRECT)
    3362           0 :                 res |= IOCB_DIRECT;
    3363       40791 :         if ((file->f_flags & O_DSYNC) || IS_SYNC(file->f_mapping->host))
    3364           0 :                 res |= IOCB_DSYNC;
    3365       40791 :         if (file->f_flags & __O_SYNC)
    3366           0 :                 res |= IOCB_SYNC;
    3367       40791 :         return res;
    3368             : }
    3369             : 
    3370         220 : static inline int kiocb_set_rw_flags(struct kiocb *ki, rwf_t flags)
    3371             : {
    3372         220 :         int kiocb_flags = 0;
    3373             : 
    3374             :         /* make sure there's no overlap between RWF and private IOCB flags */
    3375         220 :         BUILD_BUG_ON((__force int) RWF_SUPPORTED & IOCB_EVENTFD);
    3376             : 
    3377         220 :         if (!flags)
    3378             :                 return 0;
    3379           0 :         if (unlikely(flags & ~RWF_SUPPORTED))
    3380             :                 return -EOPNOTSUPP;
    3381             : 
    3382           0 :         if (flags & RWF_NOWAIT) {
    3383           0 :                 if (!(ki->ki_filp->f_mode & FMODE_NOWAIT))
    3384             :                         return -EOPNOTSUPP;
    3385             :                 kiocb_flags |= IOCB_NOIO;
    3386             :         }
    3387           0 :         kiocb_flags |= (__force int) (flags & RWF_SUPPORTED);
    3388           0 :         if (flags & RWF_SYNC)
    3389           0 :                 kiocb_flags |= IOCB_DSYNC;
    3390             : 
    3391           0 :         ki->ki_flags |= kiocb_flags;
    3392           0 :         return 0;
    3393             : }
    3394             : 
    3395         451 : static inline ino_t parent_ino(struct dentry *dentry)
    3396             : {
    3397         451 :         ino_t res;
    3398             : 
    3399             :         /*
    3400             :          * Don't strictly need d_lock here? If the parent ino could change
    3401             :          * then surely we'd have a deeper race in the caller?
    3402             :          */
    3403         451 :         spin_lock(&dentry->d_lock);
    3404         451 :         res = dentry->d_parent->d_inode->i_ino;
    3405         451 :         spin_unlock(&dentry->d_lock);
    3406         451 :         return res;
    3407             : }
    3408             : 
    3409             : /* Transaction based IO helpers */
    3410             : 
    3411             : /*
    3412             :  * An argresp is stored in an allocated page and holds the
    3413             :  * size of the argument or response, along with its content
    3414             :  */
    3415             : struct simple_transaction_argresp {
    3416             :         ssize_t size;
    3417             :         char data[];
    3418             : };
    3419             : 
    3420             : #define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp))
    3421             : 
    3422             : char *simple_transaction_get(struct file *file, const char __user *buf,
    3423             :                                 size_t size);
    3424             : ssize_t simple_transaction_read(struct file *file, char __user *buf,
    3425             :                                 size_t size, loff_t *pos);
    3426             : int simple_transaction_release(struct inode *inode, struct file *file);
    3427             : 
    3428             : void simple_transaction_set(struct file *file, size_t n);
    3429             : 
    3430             : /*
    3431             :  * simple attribute files
    3432             :  *
    3433             :  * These attributes behave similar to those in sysfs:
    3434             :  *
    3435             :  * Writing to an attribute immediately sets a value, an open file can be
    3436             :  * written to multiple times.
    3437             :  *
    3438             :  * Reading from an attribute creates a buffer from the value that might get
    3439             :  * read with multiple read calls. When the attribute has been read
    3440             :  * completely, no further read calls are possible until the file is opened
    3441             :  * again.
    3442             :  *
    3443             :  * All attributes contain a text representation of a numeric value
    3444             :  * that are accessed with the get() and set() functions.
    3445             :  */
    3446             : #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt)            \
    3447             : static int __fops ## _open(struct inode *inode, struct file *file)      \
    3448             : {                                                                       \
    3449             :         __simple_attr_check_format(__fmt, 0ull);                        \
    3450             :         return simple_attr_open(inode, file, __get, __set, __fmt);      \
    3451             : }                                                                       \
    3452             : static const struct file_operations __fops = {                          \
    3453             :         .owner   = THIS_MODULE,                                         \
    3454             :         .open    = __fops ## _open,                                     \
    3455             :         .release = simple_attr_release,                                 \
    3456             :         .read    = simple_attr_read,                                    \
    3457             :         .write   = simple_attr_write,                                   \
    3458             :         .llseek  = generic_file_llseek,                                 \
    3459             : }
    3460             : 
    3461             : static inline __printf(1, 2)
    3462           0 : void __simple_attr_check_format(const char *fmt, ...)
    3463             : {
    3464             :         /* don't do anything, just let the compiler check the arguments; */
    3465           0 : }
    3466             : 
    3467             : int simple_attr_open(struct inode *inode, struct file *file,
    3468             :                      int (*get)(void *, u64 *), int (*set)(void *, u64),
    3469             :                      const char *fmt);
    3470             : int simple_attr_release(struct inode *inode, struct file *file);
    3471             : ssize_t simple_attr_read(struct file *file, char __user *buf,
    3472             :                          size_t len, loff_t *ppos);
    3473             : ssize_t simple_attr_write(struct file *file, const char __user *buf,
    3474             :                           size_t len, loff_t *ppos);
    3475             : 
    3476             : struct ctl_table;
    3477             : int proc_nr_files(struct ctl_table *table, int write,
    3478             :                   void *buffer, size_t *lenp, loff_t *ppos);
    3479             : int proc_nr_dentry(struct ctl_table *table, int write,
    3480             :                   void *buffer, size_t *lenp, loff_t *ppos);
    3481             : int proc_nr_inodes(struct ctl_table *table, int write,
    3482             :                    void *buffer, size_t *lenp, loff_t *ppos);
    3483             : int __init get_filesystem_list(char *buf);
    3484             : 
    3485             : #define __FMODE_EXEC            ((__force int) FMODE_EXEC)
    3486             : #define __FMODE_NONOTIFY        ((__force int) FMODE_NONOTIFY)
    3487             : 
    3488             : #define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE])
    3489             : #define OPEN_FMODE(flag) ((__force fmode_t)(((flag + 1) & O_ACCMODE) | \
    3490             :                                             (flag & __FMODE_NONOTIFY)))
    3491             : 
    3492        1053 : static inline bool is_sxid(umode_t mode)
    3493             : {
    3494        1615 :         return (mode & S_ISUID) || ((mode & S_ISGID) && (mode & S_IXGRP));
    3495             : }
    3496             : 
    3497        2349 : static inline int check_sticky(struct user_namespace *mnt_userns,
    3498             :                                struct inode *dir, struct inode *inode)
    3499             : {
    3500        2349 :         if (!(dir->i_mode & S_ISVTX))
    3501             :                 return 0;
    3502             : 
    3503          21 :         return __check_sticky(mnt_userns, dir, inode);
    3504             : }
    3505             : 
    3506         489 : static inline void inode_has_no_xattr(struct inode *inode)
    3507             : {
    3508         978 :         if (!is_sxid(inode->i_mode) && (inode->i_sb->s_flags & SB_NOSEC))
    3509         489 :                 inode->i_flags |= S_NOSEC;
    3510         489 : }
    3511             : 
    3512             : static inline bool is_root_inode(struct inode *inode)
    3513             : {
    3514             :         return inode == inode->i_sb->s_root->d_inode;
    3515             : }
    3516             : 
    3517       13599 : static inline bool dir_emit(struct dir_context *ctx,
    3518             :                             const char *name, int namelen,
    3519             :                             u64 ino, unsigned type)
    3520             : {
    3521       13599 :         return ctx->actor(ctx, name, namelen, ctx->pos, ino, type) == 0;
    3522             : }
    3523         451 : static inline bool dir_emit_dot(struct file *file, struct dir_context *ctx)
    3524             : {
    3525         451 :         return ctx->actor(ctx, ".", 1, ctx->pos,
    3526         451 :                           file->f_path.dentry->d_inode->i_ino, DT_DIR) == 0;
    3527             : }
    3528         451 : static inline bool dir_emit_dotdot(struct file *file, struct dir_context *ctx)
    3529             : {
    3530         451 :         return ctx->actor(ctx, "..", 2, ctx->pos,
    3531         451 :                           parent_ino(file->f_path.dentry), DT_DIR) == 0;
    3532             : }
    3533         900 : static inline bool dir_emit_dots(struct file *file, struct dir_context *ctx)
    3534             : {
    3535         900 :         if (ctx->pos == 0) {
    3536         451 :                 if (!dir_emit_dot(file, ctx))
    3537             :                         return false;
    3538         451 :                 ctx->pos = 1;
    3539             :         }
    3540         900 :         if (ctx->pos == 1) {
    3541         451 :                 if (!dir_emit_dotdot(file, ctx))
    3542             :                         return false;
    3543         451 :                 ctx->pos = 2;
    3544             :         }
    3545             :         return true;
    3546             : }
    3547             : static inline bool dir_relax(struct inode *inode)
    3548             : {
    3549             :         inode_unlock(inode);
    3550             :         inode_lock(inode);
    3551             :         return !IS_DEADDIR(inode);
    3552             : }
    3553             : 
    3554           0 : static inline bool dir_relax_shared(struct inode *inode)
    3555             : {
    3556           0 :         inode_unlock_shared(inode);
    3557           0 :         inode_lock_shared(inode);
    3558           0 :         return !IS_DEADDIR(inode);
    3559             : }
    3560             : 
    3561             : extern bool path_noexec(const struct path *path);
    3562             : extern void inode_nohighmem(struct inode *inode);
    3563             : 
    3564             : /* mm/fadvise.c */
    3565             : extern int vfs_fadvise(struct file *file, loff_t offset, loff_t len,
    3566             :                        int advice);
    3567             : extern int generic_fadvise(struct file *file, loff_t offset, loff_t len,
    3568             :                            int advice);
    3569             : 
    3570             : int vfs_ioc_setflags_prepare(struct inode *inode, unsigned int oldflags,
    3571             :                              unsigned int flags);
    3572             : 
    3573             : int vfs_ioc_fssetxattr_check(struct inode *inode, const struct fsxattr *old_fa,
    3574             :                              struct fsxattr *fa);
    3575             : 
    3576           0 : static inline void simple_fill_fsxattr(struct fsxattr *fa, __u32 xflags)
    3577             : {
    3578           0 :         memset(fa, 0, sizeof(*fa));
    3579           0 :         fa->fsx_xflags = xflags;
    3580             : }
    3581             : 
    3582             : /*
    3583             :  * Flush file data before changing attributes.  Caller must hold any locks
    3584             :  * required to prevent further writes to this file until we're done setting
    3585             :  * flags.
    3586             :  */
    3587             : static inline int inode_drain_writes(struct inode *inode)
    3588             : {
    3589             :         inode_dio_wait(inode);
    3590             :         return filemap_write_and_wait(inode->i_mapping);
    3591             : }
    3592             : 
    3593             : #endif /* _LINUX_FS_H */

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