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 12 /* 13 * It's silly to have NR_OPEN bigger than NR_FILE, but you can change 14 * the file limit at runtime and only root can increase the per-process 15 * nr_file rlimit, so it's safe to set up a ridiculously high absolute 16 * upper limit on files-per-process. 17 * 18 * Some programs (notably those using select()) may have to be 19 * recompiled to take full advantage of the new limits.. 20 */ 21 22 /* Fixed constants first: */ 23 #undef NR_OPEN 24 extern int sysctl_nr_open; 25 #define INR_OPEN 1024 /* Initial setting for nfile rlimits */ 26 27 #define BLOCK_SIZE_BITS 10 28 #define BLOCK_SIZE (1<<BLOCK_SIZE_BITS) 29 30 #define SEEK_SET 0 /* seek relative to beginning of file */ 31 #define SEEK_CUR 1 /* seek relative to current file position */ 32 #define SEEK_END 2 /* seek relative to end of file */ 33 #define SEEK_MAX SEEK_END 34 35 /* And dynamically-tunable limits and defaults: */ 36 struct files_stat_struct { 37 int nr_files; /* read only */ 38 int nr_free_files; /* read only */ 39 int max_files; /* tunable */ 40 }; 41 extern struct files_stat_struct files_stat; 42 extern int get_max_files(void); 43 44 struct inodes_stat_t { 45 int nr_inodes; 46 int nr_unused; 47 int dummy[5]; /* padding for sysctl ABI compatibility */ 48 }; 49 extern struct inodes_stat_t inodes_stat; 50 51 extern int leases_enable, lease_break_time; 52 53 #ifdef CONFIG_DNOTIFY 54 extern int dir_notify_enable; 55 #endif 56 57 #define NR_FILE 8192 /* this can well be larger on a larger system */ 58 59 #define MAY_EXEC 1 60 #define MAY_WRITE 2 61 #define MAY_READ 4 62 #define MAY_APPEND 8 63 64 #define FMODE_READ 1 65 #define FMODE_WRITE 2 66 67 /* Internal kernel extensions */ 68 #define FMODE_LSEEK 4 69 #define FMODE_PREAD 8 70 #define FMODE_PWRITE FMODE_PREAD /* These go hand in hand */ 71 72 /* File is being opened for execution. Primary users of this flag are 73 distributed filesystems that can use it to achieve correct ETXTBUSY 74 behavior for cross-node execution/opening_for_writing of files */ 75 #define FMODE_EXEC 16 76 77 #define RW_MASK 1 78 #define RWA_MASK 2 79 #define READ 0 80 #define WRITE 1 81 #define READA 2 /* read-ahead - don't block if no resources */ 82 #define SWRITE 3 /* for ll_rw_block() - wait for buffer lock */ 83 #define READ_SYNC (READ | (1 << BIO_RW_SYNC)) 84 #define READ_META (READ | (1 << BIO_RW_META)) 85 #define WRITE_SYNC (WRITE | (1 << BIO_RW_SYNC)) 86 #define SWRITE_SYNC (SWRITE | (1 << BIO_RW_SYNC)) 87 #define WRITE_BARRIER ((1 << BIO_RW) | (1 << BIO_RW_BARRIER)) 88 89 #define SEL_IN 1 90 #define SEL_OUT 2 91 #define SEL_EX 4 92 93 /* public flags for file_system_type */ 94 #define FS_REQUIRES_DEV 1 95 #define FS_BINARY_MOUNTDATA 2 96 #define FS_HAS_SUBTYPE 4 97 #define FS_REVAL_DOT 16384 /* Check the paths ".", ".." for staleness */ 98 #define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move() 99 * during rename() internally. 100 */ 101 102 /* 103 * These are the fs-independent mount-flags: up to 32 flags are supported 104 */ 105 #define MS_RDONLY 1 /* Mount read-only */ 106 #define MS_NOSUID 2 /* Ignore suid and sgid bits */ 107 #define MS_NODEV 4 /* Disallow access to device special files */ 108 #define MS_NOEXEC 8 /* Disallow program execution */ 109 #define MS_SYNCHRONOUS 16 /* Writes are synced at once */ 110 #define MS_REMOUNT 32 /* Alter flags of a mounted FS */ 111 #define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */ 112 #define MS_DIRSYNC 128 /* Directory modifications are synchronous */ 113 #define MS_NOATIME 1024 /* Do not update access times. */ 114 #define MS_NODIRATIME 2048 /* Do not update directory access times */ 115 #define MS_BIND 4096 116 #define MS_MOVE 8192 117 #define MS_REC 16384 118 #define MS_VERBOSE 32768 /* War is peace. Verbosity is silence. 119 MS_VERBOSE is deprecated. */ 120 #define MS_SILENT 32768 121 #define MS_POSIXACL (1<<16) /* VFS does not apply the umask */ 122 #define MS_UNBINDABLE (1<<17) /* change to unbindable */ 123 #define MS_PRIVATE (1<<18) /* change to private */ 124 #define MS_SLAVE (1<<19) /* change to slave */ 125 #define MS_SHARED (1<<20) /* change to shared */ 126 #define MS_RELATIME (1<<21) /* Update atime relative to mtime/ctime. */ 127 #define MS_KERNMOUNT (1<<22) /* this is a kern_mount call */ 128 #define MS_I_VERSION (1<<23) /* Update inode I_version field */ 129 #define MS_ACTIVE (1<<30) 130 #define MS_NOUSER (1<<31) 131 132 /* 133 * Superblock flags that can be altered by MS_REMOUNT 134 */ 135 #define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK) 136 137 /* 138 * Old magic mount flag and mask 139 */ 140 #define MS_MGC_VAL 0xC0ED0000 141 #define MS_MGC_MSK 0xffff0000 142 143 /* Inode flags - they have nothing to superblock flags now */ 144 145 #define S_SYNC 1 /* Writes are synced at once */ 146 #define S_NOATIME 2 /* Do not update access times */ 147 #define S_APPEND 4 /* Append-only file */ 148 #define S_IMMUTABLE 8 /* Immutable file */ 149 #define S_DEAD 16 /* removed, but still open directory */ 150 #define S_NOQUOTA 32 /* Inode is not counted to quota */ 151 #define S_DIRSYNC 64 /* Directory modifications are synchronous */ 152 #define S_NOCMTIME 128 /* Do not update file c/mtime */ 153 #define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */ 154 #define S_PRIVATE 512 /* Inode is fs-internal */ 155 156 /* 157 * Note that nosuid etc flags are inode-specific: setting some file-system 158 * flags just means all the inodes inherit those flags by default. It might be 159 * possible to override it selectively if you really wanted to with some 160 * ioctl() that is not currently implemented. 161 * 162 * Exception: MS_RDONLY is always applied to the entire file system. 163 * 164 * Unfortunately, it is possible to change a filesystems flags with it mounted 165 * with files in use. This means that all of the inodes will not have their 166 * i_flags updated. Hence, i_flags no longer inherit the superblock mount 167 * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org 168 */ 169 #define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg)) 170 171 #define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY) 172 #define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \ 173 ((inode)->i_flags & S_SYNC)) 174 #define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \ 175 ((inode)->i_flags & (S_SYNC|S_DIRSYNC))) 176 #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK) 177 #define IS_NOATIME(inode) __IS_FLG(inode, MS_RDONLY|MS_NOATIME) 178 #define IS_I_VERSION(inode) __IS_FLG(inode, MS_I_VERSION) 179 180 #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA) 181 #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND) 182 #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE) 183 #define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL) 184 185 #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD) 186 #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME) 187 #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE) 188 #define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE) 189 190 /* the read-only stuff doesn't really belong here, but any other place is 191 probably as bad and I don't want to create yet another include file. */ 192 193 #define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */ 194 #define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */ 195 #define BLKRRPART _IO(0x12,95) /* re-read partition table */ 196 #define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */ 197 #define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */ 198 #define BLKRASET _IO(0x12,98) /* set read ahead for block device */ 199 #define BLKRAGET _IO(0x12,99) /* get current read ahead setting */ 200 #define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */ 201 #define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */ 202 #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */ 203 #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */ 204 #define BLKSSZGET _IO(0x12,104)/* get block device sector size */ 205 #if 0 206 #define BLKPG _IO(0x12,105)/* See blkpg.h */ 207 208 /* Some people are morons. Do not use sizeof! */ 209 210 #define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */ 211 #define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */ 212 /* This was here just to show that the number is taken - 213 probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */ 214 #endif 215 /* A jump here: 108-111 have been used for various private purposes. */ 216 #define BLKBSZGET _IOR(0x12,112,size_t) 217 #define BLKBSZSET _IOW(0x12,113,size_t) 218 #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */ 219 #define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup) 220 #define BLKTRACESTART _IO(0x12,116) 221 #define BLKTRACESTOP _IO(0x12,117) 222 #define BLKTRACETEARDOWN _IO(0x12,118) 223 224 #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */ 225 #define FIBMAP _IO(0x00,1) /* bmap access */ 226 #define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */ 227 228 #define FS_IOC_GETFLAGS _IOR('f', 1, long) 229 #define FS_IOC_SETFLAGS _IOW('f', 2, long) 230 #define FS_IOC_GETVERSION _IOR('v', 1, long) 231 #define FS_IOC_SETVERSION _IOW('v', 2, long) 232 #define FS_IOC32_GETFLAGS _IOR('f', 1, int) 233 #define FS_IOC32_SETFLAGS _IOW('f', 2, int) 234 #define FS_IOC32_GETVERSION _IOR('v', 1, int) 235 #define FS_IOC32_SETVERSION _IOW('v', 2, int) 236 237 /* 238 * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS) 239 */ 240 #define FS_SECRM_FL 0x00000001 /* Secure deletion */ 241 #define FS_UNRM_FL 0x00000002 /* Undelete */ 242 #define FS_COMPR_FL 0x00000004 /* Compress file */ 243 #define FS_SYNC_FL 0x00000008 /* Synchronous updates */ 244 #define FS_IMMUTABLE_FL 0x00000010 /* Immutable file */ 245 #define FS_APPEND_FL 0x00000020 /* writes to file may only append */ 246 #define FS_NODUMP_FL 0x00000040 /* do not dump file */ 247 #define FS_NOATIME_FL 0x00000080 /* do not update atime */ 248 /* Reserved for compression usage... */ 249 #define FS_DIRTY_FL 0x00000100 250 #define FS_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 251 #define FS_NOCOMP_FL 0x00000400 /* Don't compress */ 252 #define FS_ECOMPR_FL 0x00000800 /* Compression error */ 253 /* End compression flags --- maybe not all used */ 254 #define FS_BTREE_FL 0x00001000 /* btree format dir */ 255 #define FS_INDEX_FL 0x00001000 /* hash-indexed directory */ 256 #define FS_IMAGIC_FL 0x00002000 /* AFS directory */ 257 #define FS_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */ 258 #define FS_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 259 #define FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 260 #define FS_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 261 #define FS_EXTENT_FL 0x00080000 /* Extents */ 262 #define FS_DIRECTIO_FL 0x00100000 /* Use direct i/o */ 263 #define FS_RESERVED_FL 0x80000000 /* reserved for ext2 lib */ 264 265 #define FS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */ 266 #define FS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */ 267 268 269 #define SYNC_FILE_RANGE_WAIT_BEFORE 1 270 #define SYNC_FILE_RANGE_WRITE 2 271 #define SYNC_FILE_RANGE_WAIT_AFTER 4 272 273 #endif /* _LINUX_FS_H */ 274