LCOV - code coverage report
Current view: top level - include/linux - kdev_t.h (source / functions) Hit Total Coverage
Test: landlock.info Lines: 10 18 55.6 %
Date: 2021-04-22 12:43:58 Functions: 0 0 -

          Line data    Source code
       1             : /* SPDX-License-Identifier: GPL-2.0 */
       2             : #ifndef _LINUX_KDEV_T_H
       3             : #define _LINUX_KDEV_T_H
       4             : 
       5             : #include <uapi/linux/kdev_t.h>
       6             : 
       7             : #define MINORBITS       20
       8             : #define MINORMASK       ((1U << MINORBITS) - 1)
       9             : 
      10             : #define MAJOR(dev)      ((unsigned int) ((dev) >> MINORBITS))
      11             : #define MINOR(dev)      ((unsigned int) ((dev) & MINORMASK))
      12             : #define MKDEV(ma,mi)    (((ma) << MINORBITS) | (mi))
      13             : 
      14             : #define print_dev_t(buffer, dev)                                        \
      15             :         sprintf((buffer), "%u:%u\n", MAJOR(dev), MINOR(dev))
      16             : 
      17             : #define format_dev_t(buffer, dev)                                       \
      18             :         ({                                                              \
      19             :                 sprintf(buffer, "%u:%u", MAJOR(dev), MINOR(dev));     \
      20             :                 buffer;                                                 \
      21             :         })
      22             : 
      23             : /* acceptable for old filesystems */
      24           0 : static __always_inline bool old_valid_dev(dev_t dev)
      25             : {
      26           0 :         return MAJOR(dev) < 256 && MINOR(dev) < 256;
      27             : }
      28             : 
      29           0 : static __always_inline u16 old_encode_dev(dev_t dev)
      30             : {
      31           0 :         return (MAJOR(dev) << 8) | MINOR(dev);
      32             : }
      33             : 
      34           1 : static __always_inline dev_t old_decode_dev(u16 val)
      35             : {
      36           1 :         return MKDEV((val >> 8) & 255, val & 255);
      37             : }
      38             : 
      39       92958 : static __always_inline u32 new_encode_dev(dev_t dev)
      40             : {
      41       92958 :         unsigned major = MAJOR(dev);
      42       92958 :         unsigned minor = MINOR(dev);
      43       92958 :         return (minor & 0xff) | (major << 8) | ((minor & ~0xff) << 12);
      44             : }
      45             : 
      46          26 : static __always_inline dev_t new_decode_dev(u32 dev)
      47             : {
      48          26 :         unsigned major = (dev & 0xfff00) >> 8;
      49          26 :         unsigned minor = (dev & 0xff) | ((dev >> 12) & 0xfff00);
      50          26 :         return MKDEV(major, minor);
      51             : }
      52             : 
      53           0 : static __always_inline u64 huge_encode_dev(dev_t dev)
      54             : {
      55           0 :         return new_encode_dev(dev);
      56             : }
      57             : 
      58           0 : static __always_inline dev_t huge_decode_dev(u64 dev)
      59             : {
      60           0 :         return new_decode_dev(dev);
      61             : }
      62             : 
      63             : static __always_inline int sysv_valid_dev(dev_t dev)
      64             : {
      65             :         return MAJOR(dev) < (1<<14) && MINOR(dev) < (1<<18);
      66             : }
      67             : 
      68             : static __always_inline u32 sysv_encode_dev(dev_t dev)
      69             : {
      70             :         return MINOR(dev) | (MAJOR(dev) << 18);
      71             : }
      72             : 
      73             : static __always_inline unsigned sysv_major(u32 dev)
      74             : {
      75             :         return (dev >> 18) & 0x3fff;
      76             : }
      77             : 
      78             : static __always_inline unsigned sysv_minor(u32 dev)
      79             : {
      80             :         return dev & 0x3ffff;
      81             : }
      82             : 
      83             : #endif

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