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1 : // SPDX-License-Identifier: GPL-2.0 2 : /* 3 : * fs/ext4/mballoc.h 4 : * 5 : * Written by: Alex Tomas <alex@clusterfs.com> 6 : * 7 : */ 8 : #ifndef _EXT4_MBALLOC_H 9 : #define _EXT4_MBALLOC_H 10 : 11 : #include <linux/time.h> 12 : #include <linux/fs.h> 13 : #include <linux/namei.h> 14 : #include <linux/quotaops.h> 15 : #include <linux/buffer_head.h> 16 : #include <linux/module.h> 17 : #include <linux/swap.h> 18 : #include <linux/proc_fs.h> 19 : #include <linux/pagemap.h> 20 : #include <linux/seq_file.h> 21 : #include <linux/blkdev.h> 22 : #include <linux/mutex.h> 23 : #include "ext4_jbd2.h" 24 : #include "ext4.h" 25 : 26 : /* 27 : * mb_debug() dynamic printk msgs could be used to debug mballoc code. 28 : */ 29 : #ifdef CONFIG_EXT4_DEBUG 30 : #define mb_debug(sb, fmt, ...) \ 31 : pr_debug("[%s/%d] EXT4-fs (%s): (%s, %d): %s: " fmt, \ 32 : current->comm, task_pid_nr(current), sb->s_id, \ 33 : __FILE__, __LINE__, __func__, ##__VA_ARGS__) 34 : #else 35 : #define mb_debug(sb, fmt, ...) no_printk(fmt, ##__VA_ARGS__) 36 : #endif 37 : 38 : #define EXT4_MB_HISTORY_ALLOC 1 /* allocation */ 39 : #define EXT4_MB_HISTORY_PREALLOC 2 /* preallocated blocks used */ 40 : 41 : /* 42 : * How long mballoc can look for a best extent (in found extents) 43 : */ 44 : #define MB_DEFAULT_MAX_TO_SCAN 200 45 : 46 : /* 47 : * How long mballoc must look for a best extent 48 : */ 49 : #define MB_DEFAULT_MIN_TO_SCAN 10 50 : 51 : /* 52 : * with 'ext4_mb_stats' allocator will collect stats that will be 53 : * shown at umount. The collecting costs though! 54 : */ 55 : #define MB_DEFAULT_STATS 0 56 : 57 : /* 58 : * files smaller than MB_DEFAULT_STREAM_THRESHOLD are served 59 : * by the stream allocator, which purpose is to pack requests 60 : * as close each to other as possible to produce smooth I/O traffic 61 : * We use locality group prealloc space for stream request. 62 : * We can tune the same via /proc/fs/ext4/<parition>/stream_req 63 : */ 64 : #define MB_DEFAULT_STREAM_THRESHOLD 16 /* 64K */ 65 : 66 : /* 67 : * for which requests use 2^N search using buddies 68 : */ 69 : #define MB_DEFAULT_ORDER2_REQS 2 70 : 71 : /* 72 : * default group prealloc size 512 blocks 73 : */ 74 : #define MB_DEFAULT_GROUP_PREALLOC 512 75 : 76 : /* 77 : * maximum length of inode prealloc list 78 : */ 79 : #define MB_DEFAULT_MAX_INODE_PREALLOC 512 80 : 81 : struct ext4_free_data { 82 : /* this links the free block information from sb_info */ 83 : struct list_head efd_list; 84 : 85 : /* this links the free block information from group_info */ 86 : struct rb_node efd_node; 87 : 88 : /* group which free block extent belongs */ 89 : ext4_group_t efd_group; 90 : 91 : /* free block extent */ 92 : ext4_grpblk_t efd_start_cluster; 93 : ext4_grpblk_t efd_count; 94 : 95 : /* transaction which freed this extent */ 96 : tid_t efd_tid; 97 : }; 98 : 99 : struct ext4_prealloc_space { 100 : struct list_head pa_inode_list; 101 : struct list_head pa_group_list; 102 : union { 103 : struct list_head pa_tmp_list; 104 : struct rcu_head pa_rcu; 105 : } u; 106 : spinlock_t pa_lock; 107 : atomic_t pa_count; 108 : unsigned pa_deleted; 109 : ext4_fsblk_t pa_pstart; /* phys. block */ 110 : ext4_lblk_t pa_lstart; /* log. block */ 111 : ext4_grpblk_t pa_len; /* len of preallocated chunk */ 112 : ext4_grpblk_t pa_free; /* how many blocks are free */ 113 : unsigned short pa_type; /* pa type. inode or group */ 114 : spinlock_t *pa_obj_lock; 115 : struct inode *pa_inode; /* hack, for history only */ 116 : }; 117 : 118 : enum { 119 : MB_INODE_PA = 0, 120 : MB_GROUP_PA = 1 121 : }; 122 : 123 : struct ext4_free_extent { 124 : ext4_lblk_t fe_logical; 125 : ext4_grpblk_t fe_start; /* In cluster units */ 126 : ext4_group_t fe_group; 127 : ext4_grpblk_t fe_len; /* In cluster units */ 128 : }; 129 : 130 : /* 131 : * Locality group: 132 : * we try to group all related changes together 133 : * so that writeback can flush/allocate them together as well 134 : * Size of lg_prealloc_list hash is determined by MB_DEFAULT_GROUP_PREALLOC 135 : * (512). We store prealloc space into the hash based on the pa_free blocks 136 : * order value.ie, fls(pa_free)-1; 137 : */ 138 : #define PREALLOC_TB_SIZE 10 139 : struct ext4_locality_group { 140 : /* for allocator */ 141 : /* to serialize allocates */ 142 : struct mutex lg_mutex; 143 : /* list of preallocations */ 144 : struct list_head lg_prealloc_list[PREALLOC_TB_SIZE]; 145 : spinlock_t lg_prealloc_lock; 146 : }; 147 : 148 : struct ext4_allocation_context { 149 : struct inode *ac_inode; 150 : struct super_block *ac_sb; 151 : 152 : /* original request */ 153 : struct ext4_free_extent ac_o_ex; 154 : 155 : /* goal request (normalized ac_o_ex) */ 156 : struct ext4_free_extent ac_g_ex; 157 : 158 : /* the best found extent */ 159 : struct ext4_free_extent ac_b_ex; 160 : 161 : /* copy of the best found extent taken before preallocation efforts */ 162 : struct ext4_free_extent ac_f_ex; 163 : 164 : __u16 ac_groups_scanned; 165 : __u16 ac_found; 166 : __u16 ac_tail; 167 : __u16 ac_buddy; 168 : __u16 ac_flags; /* allocation hints */ 169 : __u8 ac_status; 170 : __u8 ac_criteria; 171 : __u8 ac_2order; /* if request is to allocate 2^N blocks and 172 : * N > 0, the field stores N, otherwise 0 */ 173 : __u8 ac_op; /* operation, for history only */ 174 : struct page *ac_bitmap_page; 175 : struct page *ac_buddy_page; 176 : struct ext4_prealloc_space *ac_pa; 177 : struct ext4_locality_group *ac_lg; 178 : }; 179 : 180 : #define AC_STATUS_CONTINUE 1 181 : #define AC_STATUS_FOUND 2 182 : #define AC_STATUS_BREAK 3 183 : 184 : struct ext4_buddy { 185 : struct page *bd_buddy_page; 186 : void *bd_buddy; 187 : struct page *bd_bitmap_page; 188 : void *bd_bitmap; 189 : struct ext4_group_info *bd_info; 190 : struct super_block *bd_sb; 191 : __u16 bd_blkbits; 192 : ext4_group_t bd_group; 193 : }; 194 : 195 548 : static inline ext4_fsblk_t ext4_grp_offs_to_block(struct super_block *sb, 196 : struct ext4_free_extent *fex) 197 : { 198 548 : return ext4_group_first_block_no(sb, fex->fe_group) + 199 548 : (fex->fe_start << EXT4_SB(sb)->s_cluster_bits); 200 : } 201 : 202 : typedef int (*ext4_mballoc_query_range_fn)( 203 : struct super_block *sb, 204 : ext4_group_t agno, 205 : ext4_grpblk_t start, 206 : ext4_grpblk_t len, 207 : void *priv); 208 : 209 : int 210 : ext4_mballoc_query_range( 211 : struct super_block *sb, 212 : ext4_group_t agno, 213 : ext4_grpblk_t start, 214 : ext4_grpblk_t end, 215 : ext4_mballoc_query_range_fn formatter, 216 : void *priv); 217 : 218 : #endif
