1 #ifndef _UAPI_LINUX_FS_H 2 #define _UAPI_LINUX_FS_H 3 4 /* 5 * This file has definitions for some important file table 6 * structures etc. 7 */ 8 9 #include <linux/limits.h> 10 #include <linux/ioctl.h> 11 #include <linux/types.h> 12 13 /* 14 * It's silly to have NR_OPEN bigger than NR_FILE, but you can change 15 * the file limit at runtime and only root can increase the per-process 16 * nr_file rlimit, so it's safe to set up a ridiculously high absolute 17 * upper limit on files-per-process. 18 * 19 * Some programs (notably those using select()) may have to be 20 * recompiled to take full advantage of the new limits.. 21 */ 22 23 /* Fixed constants first: */ 24 #undef NR_OPEN 25 #define INR_OPEN_CUR 1024 /* Initial setting for nfile rlimits */ 26 #define INR_OPEN_MAX 4096 /* Hard limit for nfile rlimits */ 27 28 #define BLOCK_SIZE_BITS 10 29 #define BLOCK_SIZE (1<<BLOCK_SIZE_BITS) 30 31 #define SEEK_SET 0 /* seek relative to beginning of file */ 32 #define SEEK_CUR 1 /* seek relative to current file position */ 33 #define SEEK_END 2 /* seek relative to end of file */ 34 #define SEEK_DATA 3 /* seek to the next data */ 35 #define SEEK_HOLE 4 /* seek to the next hole */ 36 #define SEEK_MAX SEEK_HOLE 37 38 #define RENAME_NOREPLACE (1 << 0) /* Don't overwrite target */ 39 #define RENAME_EXCHANGE (1 << 1) /* Exchange source and dest */ 40 #define RENAME_WHITEOUT (1 << 2) /* Whiteout source */ 41 42 struct file_clone_range { 43 __s64 src_fd; 44 __u64 src_offset; 45 __u64 src_length; 46 __u64 dest_offset; 47 }; 48 49 struct fstrim_range { 50 __u64 start; 51 __u64 len; 52 __u64 minlen; 53 }; 54 55 /* extent-same (dedupe) ioctls; these MUST match the btrfs ioctl definitions */ 56 #define FILE_DEDUPE_RANGE_SAME 0 57 #define FILE_DEDUPE_RANGE_DIFFERS 1 58 59 /* from struct btrfs_ioctl_file_extent_same_info */ 60 struct file_dedupe_range_info { 61 __s64 dest_fd; /* in - destination file */ 62 __u64 dest_offset; /* in - start of extent in destination */ 63 __u64 bytes_deduped; /* out - total # of bytes we were able 64 * to dedupe from this file. */ 65 /* status of this dedupe operation: 66 * < 0 for error 67 * == FILE_DEDUPE_RANGE_SAME if dedupe succeeds 68 * == FILE_DEDUPE_RANGE_DIFFERS if data differs 69 */ 70 __s32 status; /* out - see above description */ 71 __u32 reserved; /* must be zero */ 72 }; 73 74 /* from struct btrfs_ioctl_file_extent_same_args */ 75 struct file_dedupe_range { 76 __u64 src_offset; /* in - start of extent in source */ 77 __u64 src_length; /* in - length of extent */ 78 __u16 dest_count; /* in - total elements in info array */ 79 __u16 reserved1; /* must be zero */ 80 __u32 reserved2; /* must be zero */ 81 struct file_dedupe_range_info info[0]; 82 }; 83 84 /* And dynamically-tunable limits and defaults: */ 85 struct files_stat_struct { 86 unsigned long nr_files; /* read only */ 87 unsigned long nr_free_files; /* read only */ 88 unsigned long max_files; /* tunable */ 89 }; 90 91 struct inodes_stat_t { 92 long nr_inodes; 93 long nr_unused; 94 long dummy[5]; /* padding for sysctl ABI compatibility */ 95 }; 96 97 98 #define NR_FILE 8192 /* this can well be larger on a larger system */ 99 100 101 /* 102 * These are the fs-independent mount-flags: up to 32 flags are supported 103 */ 104 #define MS_RDONLY 1 /* Mount read-only */ 105 #define MS_NOSUID 2 /* Ignore suid and sgid bits */ 106 #define MS_NODEV 4 /* Disallow access to device special files */ 107 #define MS_NOEXEC 8 /* Disallow program execution */ 108 #define MS_SYNCHRONOUS 16 /* Writes are synced at once */ 109 #define MS_REMOUNT 32 /* Alter flags of a mounted FS */ 110 #define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */ 111 #define MS_DIRSYNC 128 /* Directory modifications are synchronous */ 112 #define MS_NOATIME 1024 /* Do not update access times. */ 113 #define MS_NODIRATIME 2048 /* Do not update directory access times */ 114 #define MS_BIND 4096 115 #define MS_MOVE 8192 116 #define MS_REC 16384 117 #define MS_VERBOSE 32768 /* War is peace. Verbosity is silence. 118 MS_VERBOSE is deprecated. */ 119 #define MS_SILENT 32768 120 #define MS_POSIXACL (1<<16) /* VFS does not apply the umask */ 121 #define MS_UNBINDABLE (1<<17) /* change to unbindable */ 122 #define MS_PRIVATE (1<<18) /* change to private */ 123 #define MS_SLAVE (1<<19) /* change to slave */ 124 #define MS_SHARED (1<<20) /* change to shared */ 125 #define MS_RELATIME (1<<21) /* Update atime relative to mtime/ctime. */ 126 #define MS_KERNMOUNT (1<<22) /* this is a kern_mount call */ 127 #define MS_I_VERSION (1<<23) /* Update inode I_version field */ 128 #define MS_STRICTATIME (1<<24) /* Always perform atime updates */ 129 #define MS_LAZYTIME (1<<25) /* Update the on-disk [acm]times lazily */ 130 131 /* These sb flags are internal to the kernel */ 132 #define MS_NOSEC (1<<28) 133 #define MS_BORN (1<<29) 134 #define MS_ACTIVE (1<<30) 135 #define MS_NOUSER (1<<31) 136 137 /* 138 * Superblock flags that can be altered by MS_REMOUNT 139 */ 140 #define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_I_VERSION|\ 141 MS_LAZYTIME) 142 143 /* 144 * Old magic mount flag and mask 145 */ 146 #define MS_MGC_VAL 0xC0ED0000 147 #define MS_MGC_MSK 0xffff0000 148 149 /* the read-only stuff doesn't really belong here, but any other place is 150 probably as bad and I don't want to create yet another include file. */ 151 152 #define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */ 153 #define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */ 154 #define BLKRRPART _IO(0x12,95) /* re-read partition table */ 155 #define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */ 156 #define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */ 157 #define BLKRASET _IO(0x12,98) /* set read ahead for block device */ 158 #define BLKRAGET _IO(0x12,99) /* get current read ahead setting */ 159 #define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */ 160 #define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */ 161 #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */ 162 #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */ 163 #define BLKSSZGET _IO(0x12,104)/* get block device sector size */ 164 #if 0 165 #define BLKPG _IO(0x12,105)/* See blkpg.h */ 166 167 /* Some people are morons. Do not use sizeof! */ 168 169 #define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */ 170 #define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */ 171 /* This was here just to show that the number is taken - 172 probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */ 173 #endif 174 /* A jump here: 108-111 have been used for various private purposes. */ 175 #define BLKBSZGET _IOR(0x12,112,size_t) 176 #define BLKBSZSET _IOW(0x12,113,size_t) 177 #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */ 178 #define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup) 179 #define BLKTRACESTART _IO(0x12,116) 180 #define BLKTRACESTOP _IO(0x12,117) 181 #define BLKTRACETEARDOWN _IO(0x12,118) 182 #define BLKDISCARD _IO(0x12,119) 183 #define BLKIOMIN _IO(0x12,120) 184 #define BLKIOOPT _IO(0x12,121) 185 #define BLKALIGNOFF _IO(0x12,122) 186 #define BLKPBSZGET _IO(0x12,123) 187 #define BLKDISCARDZEROES _IO(0x12,124) 188 #define BLKSECDISCARD _IO(0x12,125) 189 #define BLKROTATIONAL _IO(0x12,126) 190 #define BLKZEROOUT _IO(0x12,127) 191 #define BLKDAXSET _IO(0x12,128) 192 #define BLKDAXGET _IO(0x12,129) 193 194 #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */ 195 #define FIBMAP _IO(0x00,1) /* bmap access */ 196 #define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */ 197 #define FIFREEZE _IOWR('X', 119, int) /* Freeze */ 198 #define FITHAW _IOWR('X', 120, int) /* Thaw */ 199 #define FITRIM _IOWR('X', 121, struct fstrim_range) /* Trim */ 200 #define FICLONE _IOW(0x94, 9, int) 201 #define FICLONERANGE _IOW(0x94, 13, struct file_clone_range) 202 #define FIDEDUPERANGE _IOWR(0x94, 54, struct file_dedupe_range) 203 204 #define FS_IOC_GETFLAGS _IOR('f', 1, long) 205 #define FS_IOC_SETFLAGS _IOW('f', 2, long) 206 #define FS_IOC_GETVERSION _IOR('v', 1, long) 207 #define FS_IOC_SETVERSION _IOW('v', 2, long) 208 #define FS_IOC_FIEMAP _IOWR('f', 11, struct fiemap) 209 #define FS_IOC32_GETFLAGS _IOR('f', 1, int) 210 #define FS_IOC32_SETFLAGS _IOW('f', 2, int) 211 #define FS_IOC32_GETVERSION _IOR('v', 1, int) 212 #define FS_IOC32_SETVERSION _IOW('v', 2, int) 213 214 /* 215 * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS) 216 */ 217 #define FS_SECRM_FL 0x00000001 /* Secure deletion */ 218 #define FS_UNRM_FL 0x00000002 /* Undelete */ 219 #define FS_COMPR_FL 0x00000004 /* Compress file */ 220 #define FS_SYNC_FL 0x00000008 /* Synchronous updates */ 221 #define FS_IMMUTABLE_FL 0x00000010 /* Immutable file */ 222 #define FS_APPEND_FL 0x00000020 /* writes to file may only append */ 223 #define FS_NODUMP_FL 0x00000040 /* do not dump file */ 224 #define FS_NOATIME_FL 0x00000080 /* do not update atime */ 225 /* Reserved for compression usage... */ 226 #define FS_DIRTY_FL 0x00000100 227 #define FS_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 228 #define FS_NOCOMP_FL 0x00000400 /* Don't compress */ 229 #define FS_ECOMPR_FL 0x00000800 /* Compression error */ 230 /* End compression flags --- maybe not all used */ 231 #define FS_BTREE_FL 0x00001000 /* btree format dir */ 232 #define FS_INDEX_FL 0x00001000 /* hash-indexed directory */ 233 #define FS_IMAGIC_FL 0x00002000 /* AFS directory */ 234 #define FS_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */ 235 #define FS_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 236 #define FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 237 #define FS_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 238 #define FS_EXTENT_FL 0x00080000 /* Extents */ 239 #define FS_DIRECTIO_FL 0x00100000 /* Use direct i/o */ 240 #define FS_NOCOW_FL 0x00800000 /* Do not cow file */ 241 #define FS_PROJINHERIT_FL 0x20000000 /* Create with parents projid */ 242 #define FS_RESERVED_FL 0x80000000 /* reserved for ext2 lib */ 243 244 #define FS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */ 245 #define FS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */ 246 247 248 #define SYNC_FILE_RANGE_WAIT_BEFORE 1 249 #define SYNC_FILE_RANGE_WRITE 2 250 #define SYNC_FILE_RANGE_WAIT_AFTER 4 251 252 #endif /* _UAPI_LINUX_FS_H */ 253