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