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 41 struct fstrim_range { 42 __u64 start; 43 __u64 len; 44 __u64 minlen; 45 }; 46 47 /* And dynamically-tunable limits and defaults: */ 48 struct files_stat_struct { 49 unsigned long nr_files; /* read only */ 50 unsigned long nr_free_files; /* read only */ 51 unsigned long max_files; /* tunable */ 52 }; 53 54 struct inodes_stat_t { 55 long nr_inodes; 56 long nr_unused; 57 long dummy[5]; /* padding for sysctl ABI compatibility */ 58 }; 59 60 61 #define NR_FILE 8192 /* this can well be larger on a larger system */ 62 63 64 /* 65 * These are the fs-independent mount-flags: up to 32 flags are supported 66 */ 67 #define MS_RDONLY 1 /* Mount read-only */ 68 #define MS_NOSUID 2 /* Ignore suid and sgid bits */ 69 #define MS_NODEV 4 /* Disallow access to device special files */ 70 #define MS_NOEXEC 8 /* Disallow program execution */ 71 #define MS_SYNCHRONOUS 16 /* Writes are synced at once */ 72 #define MS_REMOUNT 32 /* Alter flags of a mounted FS */ 73 #define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */ 74 #define MS_DIRSYNC 128 /* Directory modifications are synchronous */ 75 #define MS_NOATIME 1024 /* Do not update access times. */ 76 #define MS_NODIRATIME 2048 /* Do not update directory access times */ 77 #define MS_BIND 4096 78 #define MS_MOVE 8192 79 #define MS_REC 16384 80 #define MS_VERBOSE 32768 /* War is peace. Verbosity is silence. 81 MS_VERBOSE is deprecated. */ 82 #define MS_SILENT 32768 83 #define MS_POSIXACL (1<<16) /* VFS does not apply the umask */ 84 #define MS_UNBINDABLE (1<<17) /* change to unbindable */ 85 #define MS_PRIVATE (1<<18) /* change to private */ 86 #define MS_SLAVE (1<<19) /* change to slave */ 87 #define MS_SHARED (1<<20) /* change to shared */ 88 #define MS_RELATIME (1<<21) /* Update atime relative to mtime/ctime. */ 89 #define MS_KERNMOUNT (1<<22) /* this is a kern_mount call */ 90 #define MS_I_VERSION (1<<23) /* Update inode I_version field */ 91 #define MS_STRICTATIME (1<<24) /* Always perform atime updates */ 92 93 /* These sb flags are internal to the kernel */ 94 #define MS_NOSEC (1<<28) 95 #define MS_BORN (1<<29) 96 #define MS_ACTIVE (1<<30) 97 #define MS_NOUSER (1<<31) 98 99 /* 100 * Superblock flags that can be altered by MS_REMOUNT 101 */ 102 #define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_I_VERSION) 103 104 /* 105 * Old magic mount flag and mask 106 */ 107 #define MS_MGC_VAL 0xC0ED0000 108 #define MS_MGC_MSK 0xffff0000 109 110 /* the read-only stuff doesn't really belong here, but any other place is 111 probably as bad and I don't want to create yet another include file. */ 112 113 #define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */ 114 #define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */ 115 #define BLKRRPART _IO(0x12,95) /* re-read partition table */ 116 #define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */ 117 #define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */ 118 #define BLKRASET _IO(0x12,98) /* set read ahead for block device */ 119 #define BLKRAGET _IO(0x12,99) /* get current read ahead setting */ 120 #define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */ 121 #define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */ 122 #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */ 123 #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */ 124 #define BLKSSZGET _IO(0x12,104)/* get block device sector size */ 125 #if 0 126 #define BLKPG _IO(0x12,105)/* See blkpg.h */ 127 128 /* Some people are morons. Do not use sizeof! */ 129 130 #define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */ 131 #define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */ 132 /* This was here just to show that the number is taken - 133 probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */ 134 #endif 135 /* A jump here: 108-111 have been used for various private purposes. */ 136 #define BLKBSZGET _IOR(0x12,112,size_t) 137 #define BLKBSZSET _IOW(0x12,113,size_t) 138 #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */ 139 #define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup) 140 #define BLKTRACESTART _IO(0x12,116) 141 #define BLKTRACESTOP _IO(0x12,117) 142 #define BLKTRACETEARDOWN _IO(0x12,118) 143 #define BLKDISCARD _IO(0x12,119) 144 #define BLKIOMIN _IO(0x12,120) 145 #define BLKIOOPT _IO(0x12,121) 146 #define BLKALIGNOFF _IO(0x12,122) 147 #define BLKPBSZGET _IO(0x12,123) 148 #define BLKDISCARDZEROES _IO(0x12,124) 149 #define BLKSECDISCARD _IO(0x12,125) 150 #define BLKROTATIONAL _IO(0x12,126) 151 #define BLKZEROOUT _IO(0x12,127) 152 153 #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */ 154 #define FIBMAP _IO(0x00,1) /* bmap access */ 155 #define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */ 156 #define FIFREEZE _IOWR('X', 119, int) /* Freeze */ 157 #define FITHAW _IOWR('X', 120, int) /* Thaw */ 158 #define FITRIM _IOWR('X', 121, struct fstrim_range) /* Trim */ 159 160 #define FS_IOC_GETFLAGS _IOR('f', 1, long) 161 #define FS_IOC_SETFLAGS _IOW('f', 2, long) 162 #define FS_IOC_GETVERSION _IOR('v', 1, long) 163 #define FS_IOC_SETVERSION _IOW('v', 2, long) 164 #define FS_IOC_FIEMAP _IOWR('f', 11, struct fiemap) 165 #define FS_IOC32_GETFLAGS _IOR('f', 1, int) 166 #define FS_IOC32_SETFLAGS _IOW('f', 2, int) 167 #define FS_IOC32_GETVERSION _IOR('v', 1, int) 168 #define FS_IOC32_SETVERSION _IOW('v', 2, int) 169 170 /* 171 * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS) 172 */ 173 #define FS_SECRM_FL 0x00000001 /* Secure deletion */ 174 #define FS_UNRM_FL 0x00000002 /* Undelete */ 175 #define FS_COMPR_FL 0x00000004 /* Compress file */ 176 #define FS_SYNC_FL 0x00000008 /* Synchronous updates */ 177 #define FS_IMMUTABLE_FL 0x00000010 /* Immutable file */ 178 #define FS_APPEND_FL 0x00000020 /* writes to file may only append */ 179 #define FS_NODUMP_FL 0x00000040 /* do not dump file */ 180 #define FS_NOATIME_FL 0x00000080 /* do not update atime */ 181 /* Reserved for compression usage... */ 182 #define FS_DIRTY_FL 0x00000100 183 #define FS_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 184 #define FS_NOCOMP_FL 0x00000400 /* Don't compress */ 185 #define FS_ECOMPR_FL 0x00000800 /* Compression error */ 186 /* End compression flags --- maybe not all used */ 187 #define FS_BTREE_FL 0x00001000 /* btree format dir */ 188 #define FS_INDEX_FL 0x00001000 /* hash-indexed directory */ 189 #define FS_IMAGIC_FL 0x00002000 /* AFS directory */ 190 #define FS_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */ 191 #define FS_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 192 #define FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 193 #define FS_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 194 #define FS_EXTENT_FL 0x00080000 /* Extents */ 195 #define FS_DIRECTIO_FL 0x00100000 /* Use direct i/o */ 196 #define FS_NOCOW_FL 0x00800000 /* Do not cow file */ 197 #define FS_RESERVED_FL 0x80000000 /* reserved for ext2 lib */ 198 199 #define FS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */ 200 #define FS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */ 201 202 203 #define SYNC_FILE_RANGE_WAIT_BEFORE 1 204 #define SYNC_FILE_RANGE_WRITE 2 205 #define SYNC_FILE_RANGE_WAIT_AFTER 4 206 207 #endif /* _UAPI_LINUX_FS_H */ 208