fs.h 8.2 KB

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  1. #ifndef _LINUX_FS_H
  2. #define _LINUX_FS_H
  3. /*
  4. * This file has definitions for some important file table
  5. * structures etc.
  6. */
  7. #include <linux/limits.h>
  8. #include <linux/ioctl.h>
  9. #include <linux/types.h>
  10. /*
  11. * It's silly to have NR_OPEN bigger than NR_FILE, but you can change
  12. * the file limit at runtime and only root can increase the per-process
  13. * nr_file rlimit, so it's safe to set up a ridiculously high absolute
  14. * upper limit on files-per-process.
  15. *
  16. * Some programs (notably those using select()) may have to be
  17. * recompiled to take full advantage of the new limits..
  18. */
  19. /* Fixed constants first: */
  20. #undef NR_OPEN
  21. #define INR_OPEN_CUR 1024 /* Initial setting for nfile rlimits */
  22. #define INR_OPEN_MAX 4096 /* Hard limit for nfile rlimits */
  23. #define BLOCK_SIZE_BITS 10
  24. #define BLOCK_SIZE (1<<BLOCK_SIZE_BITS)
  25. #define SEEK_SET 0 /* seek relative to beginning of file */
  26. #define SEEK_CUR 1 /* seek relative to current file position */
  27. #define SEEK_END 2 /* seek relative to end of file */
  28. #define SEEK_DATA 3 /* seek to the next data */
  29. #define SEEK_HOLE 4 /* seek to the next hole */
  30. #define SEEK_MAX SEEK_HOLE
  31. #define RENAME_NOREPLACE (1 << 0) /* Don't overwrite target */
  32. #define RENAME_EXCHANGE (1 << 1) /* Exchange source and dest */
  33. #define RENAME_WHITEOUT (1 << 2) /* Whiteout source */
  34. struct fstrim_range {
  35. __u64 start;
  36. __u64 len;
  37. __u64 minlen;
  38. };
  39. /* And dynamically-tunable limits and defaults: */
  40. struct files_stat_struct {
  41. unsigned long nr_files; /* read only */
  42. unsigned long nr_free_files; /* read only */
  43. unsigned long max_files; /* tunable */
  44. };
  45. struct inodes_stat_t {
  46. long nr_inodes;
  47. long nr_unused;
  48. long dummy[5]; /* padding for sysctl ABI compatibility */
  49. };
  50. #define NR_FILE 8192 /* this can well be larger on a larger system */
  51. /*
  52. * These are the fs-independent mount-flags: up to 32 flags are supported
  53. */
  54. #define MS_RDONLY 1 /* Mount read-only */
  55. #define MS_NOSUID 2 /* Ignore suid and sgid bits */
  56. #define MS_NODEV 4 /* Disallow access to device special files */
  57. #define MS_NOEXEC 8 /* Disallow program execution */
  58. #define MS_SYNCHRONOUS 16 /* Writes are synced at once */
  59. #define MS_REMOUNT 32 /* Alter flags of a mounted FS */
  60. #define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */
  61. #define MS_DIRSYNC 128 /* Directory modifications are synchronous */
  62. #define MS_NOATIME 1024 /* Do not update access times. */
  63. #define MS_NODIRATIME 2048 /* Do not update directory access times */
  64. #define MS_BIND 4096
  65. #define MS_MOVE 8192
  66. #define MS_REC 16384
  67. #define MS_VERBOSE 32768 /* War is peace. Verbosity is silence.
  68. MS_VERBOSE is deprecated. */
  69. #define MS_SILENT 32768
  70. #define MS_POSIXACL (1<<16) /* VFS does not apply the umask */
  71. #define MS_UNBINDABLE (1<<17) /* change to unbindable */
  72. #define MS_PRIVATE (1<<18) /* change to private */
  73. #define MS_SLAVE (1<<19) /* change to slave */
  74. #define MS_SHARED (1<<20) /* change to shared */
  75. #define MS_RELATIME (1<<21) /* Update atime relative to mtime/ctime. */
  76. #define MS_KERNMOUNT (1<<22) /* this is a kern_mount call */
  77. #define MS_I_VERSION (1<<23) /* Update inode I_version field */
  78. #define MS_STRICTATIME (1<<24) /* Always perform atime updates */
  79. #define MS_LAZYTIME (1<<25) /* Update the on-disk [acm]times lazily */
  80. /* These sb flags are internal to the kernel */
  81. #define MS_NOSEC (1<<28)
  82. #define MS_BORN (1<<29)
  83. #define MS_ACTIVE (1<<30)
  84. #define MS_NOUSER (1<<31)
  85. /*
  86. * Superblock flags that can be altered by MS_REMOUNT
  87. */
  88. #define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_I_VERSION|\
  89. MS_LAZYTIME)
  90. /*
  91. * Old magic mount flag and mask
  92. */
  93. #define MS_MGC_VAL 0xC0ED0000
  94. #define MS_MGC_MSK 0xffff0000
  95. /* the read-only stuff doesn't really belong here, but any other place is
  96. probably as bad and I don't want to create yet another include file. */
  97. #define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */
  98. #define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */
  99. #define BLKRRPART _IO(0x12,95) /* re-read partition table */
  100. #define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */
  101. #define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */
  102. #define BLKRASET _IO(0x12,98) /* set read ahead for block device */
  103. #define BLKRAGET _IO(0x12,99) /* get current read ahead setting */
  104. #define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */
  105. #define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */
  106. #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */
  107. #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */
  108. #define BLKSSZGET _IO(0x12,104)/* get block device sector size */
  109. #if 0
  110. #define BLKPG _IO(0x12,105)/* See blkpg.h */
  111. /* Some people are morons. Do not use sizeof! */
  112. #define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */
  113. #define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */
  114. /* This was here just to show that the number is taken -
  115. probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */
  116. #endif
  117. /* A jump here: 108-111 have been used for various private purposes. */
  118. #define BLKBSZGET _IOR(0x12,112,size_t)
  119. #define BLKBSZSET _IOW(0x12,113,size_t)
  120. #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
  121. #define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup)
  122. #define BLKTRACESTART _IO(0x12,116)
  123. #define BLKTRACESTOP _IO(0x12,117)
  124. #define BLKTRACETEARDOWN _IO(0x12,118)
  125. #define BLKDISCARD _IO(0x12,119)
  126. #define BLKIOMIN _IO(0x12,120)
  127. #define BLKIOOPT _IO(0x12,121)
  128. #define BLKALIGNOFF _IO(0x12,122)
  129. #define BLKPBSZGET _IO(0x12,123)
  130. #define BLKDISCARDZEROES _IO(0x12,124)
  131. #define BLKSECDISCARD _IO(0x12,125)
  132. #define BLKROTATIONAL _IO(0x12,126)
  133. #define BLKZEROOUT _IO(0x12,127)
  134. #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
  135. #define FIBMAP _IO(0x00,1) /* bmap access */
  136. #define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */
  137. #define FIFREEZE _IOWR('X', 119, int) /* Freeze */
  138. #define FITHAW _IOWR('X', 120, int) /* Thaw */
  139. #define FITRIM _IOWR('X', 121, struct fstrim_range) /* Trim */
  140. #define FS_IOC_GETFLAGS _IOR('f', 1, long)
  141. #define FS_IOC_SETFLAGS _IOW('f', 2, long)
  142. #define FS_IOC_GETVERSION _IOR('v', 1, long)
  143. #define FS_IOC_SETVERSION _IOW('v', 2, long)
  144. #define FS_IOC_FIEMAP _IOWR('f', 11, struct fiemap)
  145. #define FS_IOC32_GETFLAGS _IOR('f', 1, int)
  146. #define FS_IOC32_SETFLAGS _IOW('f', 2, int)
  147. #define FS_IOC32_GETVERSION _IOR('v', 1, int)
  148. #define FS_IOC32_SETVERSION _IOW('v', 2, int)
  149. /*
  150. * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS)
  151. */
  152. #define FS_SECRM_FL 0x00000001 /* Secure deletion */
  153. #define FS_UNRM_FL 0x00000002 /* Undelete */
  154. #define FS_COMPR_FL 0x00000004 /* Compress file */
  155. #define FS_SYNC_FL 0x00000008 /* Synchronous updates */
  156. #define FS_IMMUTABLE_FL 0x00000010 /* Immutable file */
  157. #define FS_APPEND_FL 0x00000020 /* writes to file may only append */
  158. #define FS_NODUMP_FL 0x00000040 /* do not dump file */
  159. #define FS_NOATIME_FL 0x00000080 /* do not update atime */
  160. /* Reserved for compression usage... */
  161. #define FS_DIRTY_FL 0x00000100
  162. #define FS_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
  163. #define FS_NOCOMP_FL 0x00000400 /* Don't compress */
  164. #define FS_ECOMPR_FL 0x00000800 /* Compression error */
  165. /* End compression flags --- maybe not all used */
  166. #define FS_BTREE_FL 0x00001000 /* btree format dir */
  167. #define FS_INDEX_FL 0x00001000 /* hash-indexed directory */
  168. #define FS_IMAGIC_FL 0x00002000 /* AFS directory */
  169. #define FS_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */
  170. #define FS_NOTAIL_FL 0x00008000 /* file tail should not be merged */
  171. #define FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
  172. #define FS_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
  173. #define FS_EXTENT_FL 0x00080000 /* Extents */
  174. #define FS_DIRECTIO_FL 0x00100000 /* Use direct i/o */
  175. #define FS_NOCOW_FL 0x00800000 /* Do not cow file */
  176. #define FS_PROJINHERIT_FL 0x20000000 /* Create with parents projid */
  177. #define FS_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
  178. #define FS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */
  179. #define FS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
  180. #define SYNC_FILE_RANGE_WAIT_BEFORE 1
  181. #define SYNC_FILE_RANGE_WRITE 2
  182. #define SYNC_FILE_RANGE_WAIT_AFTER 4
  183. #endif /* _LINUX_FS_H */