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 42struct fstrim_range { 43 __u64 start; 44 __u64 len; 45 __u64 minlen; 46}; 47 48/* And dynamically-tunable limits and defaults: */ 49struct files_stat_struct { 50 unsigned long nr_files; /* read only */ 51 unsigned long nr_free_files; /* read only */ 52 unsigned long max_files; /* tunable */ 53}; 54 55struct inodes_stat_t { 56 long nr_inodes; 57 long nr_unused; 58 long dummy[5]; /* padding for sysctl ABI compatibility */ 59}; 60 61 62#define NR_FILE 8192 /* this can well be larger on a larger system */ 63 64 65/* 66 * These are the fs-independent mount-flags: up to 32 flags are supported 67 */ 68#define MS_RDONLY 1 /* Mount read-only */ 69#define MS_NOSUID 2 /* Ignore suid and sgid bits */ 70#define MS_NODEV 4 /* Disallow access to device special files */ 71#define MS_NOEXEC 8 /* Disallow program execution */ 72#define MS_SYNCHRONOUS 16 /* Writes are synced at once */ 73#define MS_REMOUNT 32 /* Alter flags of a mounted FS */ 74#define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */ 75#define MS_DIRSYNC 128 /* Directory modifications are synchronous */ 76#define MS_NOATIME 1024 /* Do not update access times. */ 77#define MS_NODIRATIME 2048 /* Do not update directory access times */ 78#define MS_BIND 4096 79#define MS_MOVE 8192 80#define MS_REC 16384 81#define MS_VERBOSE 32768 /* War is peace. Verbosity is silence. 82 MS_VERBOSE is deprecated. */ 83#define MS_SILENT 32768 84#define MS_POSIXACL (1<<16) /* VFS does not apply the umask */ 85#define MS_UNBINDABLE (1<<17) /* change to unbindable */ 86#define MS_PRIVATE (1<<18) /* change to private */ 87#define MS_SLAVE (1<<19) /* change to slave */ 88#define MS_SHARED (1<<20) /* change to shared */ 89#define MS_RELATIME (1<<21) /* Update atime relative to mtime/ctime. */ 90#define MS_KERNMOUNT (1<<22) /* this is a kern_mount call */ 91#define MS_I_VERSION (1<<23) /* Update inode I_version field */ 92#define MS_STRICTATIME (1<<24) /* Always perform atime updates */ 93#define MS_LAZYTIME (1<<25) /* Update the on-disk [acm]times lazily */ 94 95/* These sb flags are internal to the kernel */ 96#define MS_NOSEC (1<<28) 97#define MS_BORN (1<<29) 98#define MS_ACTIVE (1<<30) 99#define MS_NOUSER (1<<31) 100 101/* 102 * Superblock flags that can be altered by MS_REMOUNT 103 */ 104#define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_I_VERSION|\ 105 MS_LAZYTIME) 106 107/* 108 * Old magic mount flag and mask 109 */ 110#define MS_MGC_VAL 0xC0ED0000 111#define MS_MGC_MSK 0xffff0000 112 113/* the read-only stuff doesn't really belong here, but any other place is 114 probably as bad and I don't want to create yet another include file. */ 115 116#define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */ 117#define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */ 118#define BLKRRPART _IO(0x12,95) /* re-read partition table */ 119#define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */ 120#define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */ 121#define BLKRASET _IO(0x12,98) /* set read ahead for block device */ 122#define BLKRAGET _IO(0x12,99) /* get current read ahead setting */ 123#define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */ 124#define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */ 125#define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */ 126#define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */ 127#define BLKSSZGET _IO(0x12,104)/* get block device sector size */ 128#if 0 129#define BLKPG _IO(0x12,105)/* See blkpg.h */ 130 131/* Some people are morons. Do not use sizeof! */ 132 133#define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */ 134#define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */ 135/* This was here just to show that the number is taken - 136 probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */ 137#endif 138/* A jump here: 108-111 have been used for various private purposes. */ 139#define BLKBSZGET _IOR(0x12,112,size_t) 140#define BLKBSZSET _IOW(0x12,113,size_t) 141#define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */ 142#define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup) 143#define BLKTRACESTART _IO(0x12,116) 144#define BLKTRACESTOP _IO(0x12,117) 145#define BLKTRACETEARDOWN _IO(0x12,118) 146#define BLKDISCARD _IO(0x12,119) 147#define BLKIOMIN _IO(0x12,120) 148#define BLKIOOPT _IO(0x12,121) 149#define BLKALIGNOFF _IO(0x12,122) 150#define BLKPBSZGET _IO(0x12,123) 151#define BLKDISCARDZEROES _IO(0x12,124) 152#define BLKSECDISCARD _IO(0x12,125) 153#define BLKROTATIONAL _IO(0x12,126) 154#define BLKZEROOUT _IO(0x12,127) 155 156#define BMAP_IOCTL 1 /* obsolete - kept for compatibility */ 157#define FIBMAP _IO(0x00,1) /* bmap access */ 158#define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */ 159#define FIFREEZE _IOWR('X', 119, int) /* Freeze */ 160#define FITHAW _IOWR('X', 120, int) /* Thaw */ 161#define FITRIM _IOWR('X', 121, struct fstrim_range) /* Trim */ 162 163#define FS_IOC_GETFLAGS _IOR('f', 1, long) 164#define FS_IOC_SETFLAGS _IOW('f', 2, long) 165#define FS_IOC_GETVERSION _IOR('v', 1, long) 166#define FS_IOC_SETVERSION _IOW('v', 2, long) 167#define FS_IOC_FIEMAP _IOWR('f', 11, struct fiemap) 168#define FS_IOC32_GETFLAGS _IOR('f', 1, int) 169#define FS_IOC32_SETFLAGS _IOW('f', 2, int) 170#define FS_IOC32_GETVERSION _IOR('v', 1, int) 171#define FS_IOC32_SETVERSION _IOW('v', 2, int) 172 173/* 174 * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS) 175 */ 176#define FS_SECRM_FL 0x00000001 /* Secure deletion */ 177#define FS_UNRM_FL 0x00000002 /* Undelete */ 178#define FS_COMPR_FL 0x00000004 /* Compress file */ 179#define FS_SYNC_FL 0x00000008 /* Synchronous updates */ 180#define FS_IMMUTABLE_FL 0x00000010 /* Immutable file */ 181#define FS_APPEND_FL 0x00000020 /* writes to file may only append */ 182#define FS_NODUMP_FL 0x00000040 /* do not dump file */ 183#define FS_NOATIME_FL 0x00000080 /* do not update atime */ 184/* Reserved for compression usage... */ 185#define FS_DIRTY_FL 0x00000100 186#define FS_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 187#define FS_NOCOMP_FL 0x00000400 /* Don't compress */ 188#define FS_ECOMPR_FL 0x00000800 /* Compression error */ 189/* End compression flags --- maybe not all used */ 190#define FS_BTREE_FL 0x00001000 /* btree format dir */ 191#define FS_INDEX_FL 0x00001000 /* hash-indexed directory */ 192#define FS_IMAGIC_FL 0x00002000 /* AFS directory */ 193#define FS_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */ 194#define FS_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 195#define FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 196#define FS_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 197#define FS_EXTENT_FL 0x00080000 /* Extents */ 198#define FS_DIRECTIO_FL 0x00100000 /* Use direct i/o */ 199#define FS_NOCOW_FL 0x00800000 /* Do not cow file */ 200#define FS_RESERVED_FL 0x80000000 /* reserved for ext2 lib */ 201 202#define FS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */ 203#define FS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */ 204 205 206#define SYNC_FILE_RANGE_WAIT_BEFORE 1 207#define SYNC_FILE_RANGE_WRITE 2 208#define SYNC_FILE_RANGE_WAIT_AFTER 4 209 210#endif /* _UAPI_LINUX_FS_H */ 211