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 struct fstrim_range { 39 __u64 start; 40 __u64 len; 41 __u64 minlen; 42 }; 43 44 /* And dynamically-tunable limits and defaults: */ 45 struct files_stat_struct { 46 unsigned long nr_files; /* read only */ 47 unsigned long nr_free_files; /* read only */ 48 unsigned long max_files; /* tunable */ 49 }; 50 51 struct inodes_stat_t { 52 int nr_inodes; 53 int nr_unused; 54 int dummy[5]; /* padding for sysctl ABI compatibility */ 55 }; 56 57 58 #define NR_FILE 8192 /* this can well be larger on a larger system */ 59 60 #define MAY_EXEC 0x00000001 61 #define MAY_WRITE 0x00000002 62 #define MAY_READ 0x00000004 63 #define MAY_APPEND 0x00000008 64 #define MAY_ACCESS 0x00000010 65 #define MAY_OPEN 0x00000020 66 #define MAY_CHDIR 0x00000040 67 /* called from RCU mode, don't block */ 68 #define MAY_NOT_BLOCK 0x00000080 69 70 /* 71 * flags in file.f_mode. Note that FMODE_READ and FMODE_WRITE must correspond 72 * to O_WRONLY and O_RDWR via the strange trick in __dentry_open() 73 */ 74 75 /* file is open for reading */ 76 #define FMODE_READ ((__force fmode_t)0x1) 77 /* file is open for writing */ 78 #define FMODE_WRITE ((__force fmode_t)0x2) 79 /* file is seekable */ 80 #define FMODE_LSEEK ((__force fmode_t)0x4) 81 /* file can be accessed using pread */ 82 #define FMODE_PREAD ((__force fmode_t)0x8) 83 /* file can be accessed using pwrite */ 84 #define FMODE_PWRITE ((__force fmode_t)0x10) 85 /* File is opened for execution with sys_execve / sys_uselib */ 86 #define FMODE_EXEC ((__force fmode_t)0x20) 87 /* File is opened with O_NDELAY (only set for block devices) */ 88 #define FMODE_NDELAY ((__force fmode_t)0x40) 89 /* File is opened with O_EXCL (only set for block devices) */ 90 #define FMODE_EXCL ((__force fmode_t)0x80) 91 /* File is opened using open(.., 3, ..) and is writeable only for ioctls 92 (specialy hack for floppy.c) */ 93 #define FMODE_WRITE_IOCTL ((__force fmode_t)0x100) 94 /* 32bit hashes as llseek() offset (for directories) */ 95 #define FMODE_32BITHASH ((__force fmode_t)0x200) 96 /* 64bit hashes as llseek() offset (for directories) */ 97 #define FMODE_64BITHASH ((__force fmode_t)0x400) 98 99 /* 100 * Don't update ctime and mtime. 101 * 102 * Currently a special hack for the XFS open_by_handle ioctl, but we'll 103 * hopefully graduate it to a proper O_CMTIME flag supported by open(2) soon. 104 */ 105 #define FMODE_NOCMTIME ((__force fmode_t)0x800) 106 107 /* Expect random access pattern */ 108 #define FMODE_RANDOM ((__force fmode_t)0x1000) 109 110 /* File is huge (eg. /dev/kmem): treat loff_t as unsigned */ 111 #define FMODE_UNSIGNED_OFFSET ((__force fmode_t)0x2000) 112 113 /* File is opened with O_PATH; almost nothing can be done with it */ 114 #define FMODE_PATH ((__force fmode_t)0x4000) 115 116 /* File was opened by fanotify and shouldn't generate fanotify events */ 117 #define FMODE_NONOTIFY ((__force fmode_t)0x1000000) 118 119 /* 120 * Flag for rw_copy_check_uvector and compat_rw_copy_check_uvector 121 * that indicates that they should check the contents of the iovec are 122 * valid, but not check the memory that the iovec elements 123 * points too. 124 */ 125 #define CHECK_IOVEC_ONLY -1 126 127 #define SEL_IN 1 128 #define SEL_OUT 2 129 #define SEL_EX 4 130 131 /* public flags for file_system_type */ 132 #define FS_REQUIRES_DEV 1 133 #define FS_BINARY_MOUNTDATA 2 134 #define FS_HAS_SUBTYPE 4 135 #define FS_REVAL_DOT 16384 /* Check the paths ".", ".." for staleness */ 136 #define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move() 137 * during rename() internally. 138 */ 139 140 /* 141 * These are the fs-independent mount-flags: up to 32 flags are supported 142 */ 143 #define MS_RDONLY 1 /* Mount read-only */ 144 #define MS_NOSUID 2 /* Ignore suid and sgid bits */ 145 #define MS_NODEV 4 /* Disallow access to device special files */ 146 #define MS_NOEXEC 8 /* Disallow program execution */ 147 #define MS_SYNCHRONOUS 16 /* Writes are synced at once */ 148 #define MS_REMOUNT 32 /* Alter flags of a mounted FS */ 149 #define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */ 150 #define MS_DIRSYNC 128 /* Directory modifications are synchronous */ 151 #define MS_NOATIME 1024 /* Do not update access times. */ 152 #define MS_NODIRATIME 2048 /* Do not update directory access times */ 153 #define MS_BIND 4096 154 #define MS_MOVE 8192 155 #define MS_REC 16384 156 #define MS_VERBOSE 32768 /* War is peace. Verbosity is silence. 157 MS_VERBOSE is deprecated. */ 158 #define MS_SILENT 32768 159 #define MS_POSIXACL (1<<16) /* VFS does not apply the umask */ 160 #define MS_UNBINDABLE (1<<17) /* change to unbindable */ 161 #define MS_PRIVATE (1<<18) /* change to private */ 162 #define MS_SLAVE (1<<19) /* change to slave */ 163 #define MS_SHARED (1<<20) /* change to shared */ 164 #define MS_RELATIME (1<<21) /* Update atime relative to mtime/ctime. */ 165 #define MS_KERNMOUNT (1<<22) /* this is a kern_mount call */ 166 #define MS_I_VERSION (1<<23) /* Update inode I_version field */ 167 #define MS_STRICTATIME (1<<24) /* Always perform atime updates */ 168 #define MS_NOSEC (1<<28) 169 #define MS_BORN (1<<29) 170 #define MS_ACTIVE (1<<30) 171 #define MS_NOUSER (1<<31) 172 173 /* 174 * Superblock flags that can be altered by MS_REMOUNT 175 */ 176 #define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_I_VERSION) 177 178 /* 179 * Old magic mount flag and mask 180 */ 181 #define MS_MGC_VAL 0xC0ED0000 182 #define MS_MGC_MSK 0xffff0000 183 184 /* Inode flags - they have nothing to superblock flags now */ 185 186 #define S_SYNC 1 /* Writes are synced at once */ 187 #define S_NOATIME 2 /* Do not update access times */ 188 #define S_APPEND 4 /* Append-only file */ 189 #define S_IMMUTABLE 8 /* Immutable file */ 190 #define S_DEAD 16 /* removed, but still open directory */ 191 #define S_NOQUOTA 32 /* Inode is not counted to quota */ 192 #define S_DIRSYNC 64 /* Directory modifications are synchronous */ 193 #define S_NOCMTIME 128 /* Do not update file c/mtime */ 194 #define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */ 195 #define S_PRIVATE 512 /* Inode is fs-internal */ 196 #define S_IMA 1024 /* Inode has an associated IMA struct */ 197 #define S_AUTOMOUNT 2048 /* Automount/referral quasi-directory */ 198 #define S_NOSEC 4096 /* no suid or xattr security attributes */ 199 200 /* 201 * Note that nosuid etc flags are inode-specific: setting some file-system 202 * flags just means all the inodes inherit those flags by default. It might be 203 * possible to override it selectively if you really wanted to with some 204 * ioctl() that is not currently implemented. 205 * 206 * Exception: MS_RDONLY is always applied to the entire file system. 207 * 208 * Unfortunately, it is possible to change a filesystems flags with it mounted 209 * with files in use. This means that all of the inodes will not have their 210 * i_flags updated. Hence, i_flags no longer inherit the superblock mount 211 * flags, so these have to be checked separately. -- [email protected] 212 */ 213 #define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg)) 214 215 #define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY) 216 #define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \ 217 ((inode)->i_flags & S_SYNC)) 218 #define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \ 219 ((inode)->i_flags & (S_SYNC|S_DIRSYNC))) 220 #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK) 221 #define IS_NOATIME(inode) __IS_FLG(inode, MS_RDONLY|MS_NOATIME) 222 #define IS_I_VERSION(inode) __IS_FLG(inode, MS_I_VERSION) 223 224 #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA) 225 #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND) 226 #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE) 227 #define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL) 228 229 #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD) 230 #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME) 231 #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE) 232 #define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE) 233 #define IS_IMA(inode) ((inode)->i_flags & S_IMA) 234 #define IS_AUTOMOUNT(inode) ((inode)->i_flags & S_AUTOMOUNT) 235 #define IS_NOSEC(inode) ((inode)->i_flags & S_NOSEC) 236 237 /* the read-only stuff doesn't really belong here, but any other place is 238 probably as bad and I don't want to create yet another include file. */ 239 240 #define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */ 241 #define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */ 242 #define BLKRRPART _IO(0x12,95) /* re-read partition table */ 243 #define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */ 244 #define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */ 245 #define BLKRASET _IO(0x12,98) /* set read ahead for block device */ 246 #define BLKRAGET _IO(0x12,99) /* get current read ahead setting */ 247 #define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */ 248 #define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */ 249 #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */ 250 #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */ 251 #define BLKSSZGET _IO(0x12,104)/* get block device sector size */ 252 #if 0 253 #define BLKPG _IO(0x12,105)/* See blkpg.h */ 254 255 /* Some people are morons. Do not use sizeof! */ 256 257 #define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */ 258 #define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */ 259 /* This was here just to show that the number is taken - 260 probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */ 261 #endif 262 /* A jump here: 108-111 have been used for various private purposes. */ 263 #define BLKBSZGET _IOR(0x12,112,size_t) 264 #define BLKBSZSET _IOW(0x12,113,size_t) 265 #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */ 266 #define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup) 267 #define BLKTRACESTART _IO(0x12,116) 268 #define BLKTRACESTOP _IO(0x12,117) 269 #define BLKTRACETEARDOWN _IO(0x12,118) 270 #define BLKDISCARD _IO(0x12,119) 271 #define BLKIOMIN _IO(0x12,120) 272 #define BLKIOOPT _IO(0x12,121) 273 #define BLKALIGNOFF _IO(0x12,122) 274 #define BLKPBSZGET _IO(0x12,123) 275 #define BLKDISCARDZEROES _IO(0x12,124) 276 #define BLKSECDISCARD _IO(0x12,125) 277 #define BLKROTATIONAL _IO(0x12,126) 278 #define BLKZEROOUT _IO(0x12,127) 279 280 #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */ 281 #define FIBMAP _IO(0x00,1) /* bmap access */ 282 #define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */ 283 #define FIFREEZE _IOWR('X', 119, int) /* Freeze */ 284 #define FITHAW _IOWR('X', 120, int) /* Thaw */ 285 #define FITRIM _IOWR('X', 121, struct fstrim_range) /* Trim */ 286 287 #define FS_IOC_GETFLAGS _IOR('f', 1, long) 288 #define FS_IOC_SETFLAGS _IOW('f', 2, long) 289 #define FS_IOC_GETVERSION _IOR('v', 1, long) 290 #define FS_IOC_SETVERSION _IOW('v', 2, long) 291 #define FS_IOC_FIEMAP _IOWR('f', 11, struct fiemap) 292 #define FS_IOC32_GETFLAGS _IOR('f', 1, int) 293 #define FS_IOC32_SETFLAGS _IOW('f', 2, int) 294 #define FS_IOC32_GETVERSION _IOR('v', 1, int) 295 #define FS_IOC32_SETVERSION _IOW('v', 2, int) 296 297 /* 298 * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS) 299 */ 300 #define FS_SECRM_FL 0x00000001 /* Secure deletion */ 301 #define FS_UNRM_FL 0x00000002 /* Undelete */ 302 #define FS_COMPR_FL 0x00000004 /* Compress file */ 303 #define FS_SYNC_FL 0x00000008 /* Synchronous updates */ 304 #define FS_IMMUTABLE_FL 0x00000010 /* Immutable file */ 305 #define FS_APPEND_FL 0x00000020 /* writes to file may only append */ 306 #define FS_NODUMP_FL 0x00000040 /* do not dump file */ 307 #define FS_NOATIME_FL 0x00000080 /* do not update atime */ 308 /* Reserved for compression usage... */ 309 #define FS_DIRTY_FL 0x00000100 310 #define FS_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 311 #define FS_NOCOMP_FL 0x00000400 /* Don't compress */ 312 #define FS_ECOMPR_FL 0x00000800 /* Compression error */ 313 /* End compression flags --- maybe not all used */ 314 #define FS_BTREE_FL 0x00001000 /* btree format dir */ 315 #define FS_INDEX_FL 0x00001000 /* hash-indexed directory */ 316 #define FS_IMAGIC_FL 0x00002000 /* AFS directory */ 317 #define FS_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */ 318 #define FS_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 319 #define FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 320 #define FS_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 321 #define FS_EXTENT_FL 0x00080000 /* Extents */ 322 #define FS_DIRECTIO_FL 0x00100000 /* Use direct i/o */ 323 #define FS_NOCOW_FL 0x00800000 /* Do not cow file */ 324 #define FS_RESERVED_FL 0x80000000 /* reserved for ext2 lib */ 325 326 #define FS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */ 327 #define FS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */ 328 329 330 #define SYNC_FILE_RANGE_WAIT_BEFORE 1 331 #define SYNC_FILE_RANGE_WRITE 2 332 #define SYNC_FILE_RANGE_WAIT_AFTER 4 333 334 #endif /* _UAPI_LINUX_FS_H */ 335