Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #define INR_OPEN 1024 /* Initial setting for nfile rlimits */ |
| 25 | |
| 26 | #define BLOCK_SIZE_BITS 10 |
| 27 | #define BLOCK_SIZE (1<<BLOCK_SIZE_BITS) |
| 28 | |
David Howells | 01bf466 | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 29 | #define SEEK_SET 0 /* seek relative to beginning of file */ |
| 30 | #define SEEK_CUR 1 /* seek relative to current file position */ |
| 31 | #define SEEK_END 2 /* seek relative to end of file */ |
Chris Snook | 1ae7075 | 2007-05-08 00:24:15 -0700 | [diff] [blame] | 32 | #define SEEK_MAX SEEK_END |
David Howells | 01bf466 | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 33 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | /* And dynamically-tunable limits and defaults: */ |
| 35 | struct files_stat_struct { |
| 36 | int nr_files; /* read only */ |
| 37 | int nr_free_files; /* read only */ |
| 38 | int max_files; /* tunable */ |
| 39 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | |
| 41 | struct inodes_stat_t { |
| 42 | int nr_inodes; |
| 43 | int nr_unused; |
Stefan Richter | 9e7bf24 | 2007-07-15 23:40:25 -0700 | [diff] [blame] | 44 | int dummy[5]; /* padding for sysctl ABI compatibility */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | |
| 48 | #define NR_FILE 8192 /* this can well be larger on a larger system */ |
| 49 | |
| 50 | #define MAY_EXEC 1 |
| 51 | #define MAY_WRITE 2 |
| 52 | #define MAY_READ 4 |
| 53 | #define MAY_APPEND 8 |
Al Viro | e6305c4 | 2008-07-15 21:03:57 -0400 | [diff] [blame] | 54 | #define MAY_ACCESS 16 |
Al Viro | a110343 | 2008-07-17 09:19:08 -0400 | [diff] [blame] | 55 | #define MAY_OPEN 32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | |
Paul Turner | 55ec821 | 2009-02-18 14:48:15 -0800 | [diff] [blame] | 57 | /* |
| 58 | * flags in file.f_mode. Note that FMODE_READ and FMODE_WRITE must correspond |
| 59 | * to O_WRONLY and O_RDWR via the strange trick in __dentry_open() |
| 60 | */ |
| 61 | |
Christoph Hellwig | fc9161e | 2008-11-05 14:58:46 +0100 | [diff] [blame] | 62 | /* file is open for reading */ |
| 63 | #define FMODE_READ ((__force fmode_t)1) |
| 64 | /* file is open for writing */ |
| 65 | #define FMODE_WRITE ((__force fmode_t)2) |
| 66 | /* file is seekable */ |
| 67 | #define FMODE_LSEEK ((__force fmode_t)4) |
Paul Turner | 55ec821 | 2009-02-18 14:48:15 -0800 | [diff] [blame] | 68 | /* file can be accessed using pread */ |
Christoph Hellwig | fc9161e | 2008-11-05 14:58:46 +0100 | [diff] [blame] | 69 | #define FMODE_PREAD ((__force fmode_t)8) |
Paul Turner | 55ec821 | 2009-02-18 14:48:15 -0800 | [diff] [blame] | 70 | /* file can be accessed using pwrite */ |
| 71 | #define FMODE_PWRITE ((__force fmode_t)16) |
Christoph Hellwig | fc9161e | 2008-11-05 14:58:46 +0100 | [diff] [blame] | 72 | /* File is opened for execution with sys_execve / sys_uselib */ |
Paul Turner | 55ec821 | 2009-02-18 14:48:15 -0800 | [diff] [blame] | 73 | #define FMODE_EXEC ((__force fmode_t)32) |
Christoph Hellwig | fc9161e | 2008-11-05 14:58:46 +0100 | [diff] [blame] | 74 | /* File is opened with O_NDELAY (only set for block devices) */ |
Paul Turner | 55ec821 | 2009-02-18 14:48:15 -0800 | [diff] [blame] | 75 | #define FMODE_NDELAY ((__force fmode_t)64) |
Christoph Hellwig | fc9161e | 2008-11-05 14:58:46 +0100 | [diff] [blame] | 76 | /* File is opened with O_EXCL (only set for block devices) */ |
Paul Turner | 55ec821 | 2009-02-18 14:48:15 -0800 | [diff] [blame] | 77 | #define FMODE_EXCL ((__force fmode_t)128) |
Christoph Hellwig | fc9161e | 2008-11-05 14:58:46 +0100 | [diff] [blame] | 78 | /* File is opened using open(.., 3, ..) and is writeable only for ioctls |
| 79 | (specialy hack for floppy.c) */ |
Paul Turner | 55ec821 | 2009-02-18 14:48:15 -0800 | [diff] [blame] | 80 | #define FMODE_WRITE_IOCTL ((__force fmode_t)256) |
Oleg Drokin | b500531 | 2006-03-25 03:07:01 -0800 | [diff] [blame] | 81 | |
Christoph Hellwig | 4d4be48 | 2008-12-09 04:47:33 -0500 | [diff] [blame] | 82 | /* |
| 83 | * Don't update ctime and mtime. |
| 84 | * |
| 85 | * Currently a special hack for the XFS open_by_handle ioctl, but we'll |
| 86 | * hopefully graduate it to a proper O_CMTIME flag supported by open(2) soon. |
| 87 | */ |
| 88 | #define FMODE_NOCMTIME ((__force fmode_t)2048) |
| 89 | |
Jens Axboe | 48e70bc | 2009-04-14 08:19:27 +0200 | [diff] [blame] | 90 | /* |
| 91 | * The below are the various read and write types that we support. Some of |
| 92 | * them include behavioral modifiers that send information down to the |
| 93 | * block layer and IO scheduler. Terminology: |
| 94 | * |
| 95 | * The block layer uses device plugging to defer IO a little bit, in |
| 96 | * the hope that we will see more IO very shortly. This increases |
| 97 | * coalescing of adjacent IO and thus reduces the number of IOs we |
| 98 | * have to send to the device. It also allows for better queuing, |
| 99 | * if the IO isn't mergeable. If the caller is going to be waiting |
| 100 | * for the IO, then he must ensure that the device is unplugged so |
| 101 | * that the IO is dispatched to the driver. |
| 102 | * |
| 103 | * All IO is handled async in Linux. This is fine for background |
| 104 | * writes, but for reads or writes that someone waits for completion |
| 105 | * on, we want to notify the block layer and IO scheduler so that they |
| 106 | * know about it. That allows them to make better scheduling |
| 107 | * decisions. So when the below references 'sync' and 'async', it |
| 108 | * is referencing this priority hint. |
| 109 | * |
| 110 | * With that in mind, the available types are: |
| 111 | * |
| 112 | * READ A normal read operation. Device will be plugged. |
| 113 | * READ_SYNC A synchronous read. Device is not plugged, caller can |
| 114 | * immediately wait on this read without caring about |
| 115 | * unplugging. |
| 116 | * READA Used for read-ahead operations. Lower priority, and the |
| 117 | * block layer could (in theory) choose to ignore this |
| 118 | * request if it runs into resource problems. |
| 119 | * WRITE A normal async write. Device will be plugged. |
| 120 | * SWRITE Like WRITE, but a special case for ll_rw_block() that |
| 121 | * tells it to lock the buffer first. Normally a buffer |
| 122 | * must be locked before doing IO. |
| 123 | * WRITE_SYNC_PLUG Synchronous write. Identical to WRITE, but passes down |
| 124 | * the hint that someone will be waiting on this IO |
| 125 | * shortly. The device must still be unplugged explicitly, |
| 126 | * WRITE_SYNC_PLUG does not do this as we could be |
| 127 | * submitting more writes before we actually wait on any |
| 128 | * of them. |
| 129 | * WRITE_SYNC Like WRITE_SYNC_PLUG, but also unplugs the device |
| 130 | * immediately after submission. The write equivalent |
| 131 | * of READ_SYNC. |
| 132 | * WRITE_ODIRECT Special case write for O_DIRECT only. |
| 133 | * SWRITE_SYNC |
| 134 | * SWRITE_SYNC_PLUG Like WRITE_SYNC/WRITE_SYNC_PLUG, but locks the buffer. |
| 135 | * See SWRITE. |
| 136 | * WRITE_BARRIER Like WRITE, but tells the block layer that all |
| 137 | * previously submitted writes must be safely on storage |
| 138 | * before this one is started. Also guarantees that when |
| 139 | * this write is complete, it itself is also safely on |
| 140 | * storage. Prevents reordering of writes on both sides |
| 141 | * of this IO. |
| 142 | * |
| 143 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | #define RW_MASK 1 |
| 145 | #define RWA_MASK 2 |
| 146 | #define READ 0 |
| 147 | #define WRITE 1 |
| 148 | #define READA 2 /* read-ahead - don't block if no resources */ |
Jan Kara | a766223 | 2005-09-06 15:19:10 -0700 | [diff] [blame] | 149 | #define SWRITE 3 /* for ll_rw_block() - wait for buffer lock */ |
Jens Axboe | 93dbb39 | 2009-02-16 10:25:40 +0100 | [diff] [blame] | 150 | #define READ_SYNC (READ | (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG)) |
Jens Axboe | 5404bc7 | 2006-08-10 09:01:02 +0200 | [diff] [blame] | 151 | #define READ_META (READ | (1 << BIO_RW_META)) |
Jens Axboe | aeb6faf | 2009-04-06 14:48:07 +0200 | [diff] [blame] | 152 | #define WRITE_SYNC_PLUG (WRITE | (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_NOIDLE)) |
| 153 | #define WRITE_SYNC (WRITE_SYNC_PLUG | (1 << BIO_RW_UNPLUG)) |
| 154 | #define WRITE_ODIRECT (WRITE | (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG)) |
Jens Axboe | a1f2425 | 2009-04-06 14:48:02 +0200 | [diff] [blame] | 155 | #define SWRITE_SYNC_PLUG \ |
Jens Axboe | aeb6faf | 2009-04-06 14:48:07 +0200 | [diff] [blame] | 156 | (SWRITE | (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_NOIDLE)) |
| 157 | #define SWRITE_SYNC (SWRITE_SYNC_PLUG | (1 << BIO_RW_UNPLUG)) |
David Woodhouse | fb2dce8 | 2008-08-05 18:01:53 +0100 | [diff] [blame] | 158 | #define WRITE_BARRIER (WRITE | (1 << BIO_RW_BARRIER)) |
Jens Axboe | 48e70bc | 2009-04-14 08:19:27 +0200 | [diff] [blame] | 159 | |
| 160 | /* |
| 161 | * These aren't really reads or writes, they pass down information about |
| 162 | * parts of device that are now unused by the file system. |
| 163 | */ |
David Woodhouse | e17fc0a | 2008-08-09 16:42:20 +0100 | [diff] [blame] | 164 | #define DISCARD_NOBARRIER (1 << BIO_RW_DISCARD) |
| 165 | #define DISCARD_BARRIER ((1 << BIO_RW_DISCARD) | (1 << BIO_RW_BARRIER)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | |
| 167 | #define SEL_IN 1 |
| 168 | #define SEL_OUT 2 |
| 169 | #define SEL_EX 4 |
| 170 | |
| 171 | /* public flags for file_system_type */ |
| 172 | #define FS_REQUIRES_DEV 1 |
| 173 | #define FS_BINARY_MOUNTDATA 2 |
Miklos Szeredi | 79c0b2d | 2007-05-08 00:25:43 -0700 | [diff] [blame] | 174 | #define FS_HAS_SUBTYPE 4 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | #define FS_REVAL_DOT 16384 /* Check the paths ".", ".." for staleness */ |
Mark Fasheh | 349457c | 2006-09-08 14:22:21 -0700 | [diff] [blame] | 176 | #define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move() |
| 177 | * during rename() internally. |
| 178 | */ |
| 179 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | /* |
| 181 | * These are the fs-independent mount-flags: up to 32 flags are supported |
| 182 | */ |
| 183 | #define MS_RDONLY 1 /* Mount read-only */ |
| 184 | #define MS_NOSUID 2 /* Ignore suid and sgid bits */ |
| 185 | #define MS_NODEV 4 /* Disallow access to device special files */ |
| 186 | #define MS_NOEXEC 8 /* Disallow program execution */ |
| 187 | #define MS_SYNCHRONOUS 16 /* Writes are synced at once */ |
| 188 | #define MS_REMOUNT 32 /* Alter flags of a mounted FS */ |
| 189 | #define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */ |
| 190 | #define MS_DIRSYNC 128 /* Directory modifications are synchronous */ |
| 191 | #define MS_NOATIME 1024 /* Do not update access times. */ |
| 192 | #define MS_NODIRATIME 2048 /* Do not update directory access times */ |
| 193 | #define MS_BIND 4096 |
| 194 | #define MS_MOVE 8192 |
| 195 | #define MS_REC 16384 |
Theodore Ts'o | 9b04c99 | 2006-03-24 03:15:10 -0800 | [diff] [blame] | 196 | #define MS_VERBOSE 32768 /* War is peace. Verbosity is silence. |
| 197 | MS_VERBOSE is deprecated. */ |
| 198 | #define MS_SILENT 32768 |
Miklos Szeredi | bf066c7 | 2006-01-08 01:03:19 -0800 | [diff] [blame] | 199 | #define MS_POSIXACL (1<<16) /* VFS does not apply the umask */ |
Ram Pai | 9676f0c | 2005-11-07 17:21:20 -0500 | [diff] [blame] | 200 | #define MS_UNBINDABLE (1<<17) /* change to unbindable */ |
Ram Pai | 07b2088 | 2005-11-07 17:19:07 -0500 | [diff] [blame] | 201 | #define MS_PRIVATE (1<<18) /* change to private */ |
Ram Pai | a58b0eb | 2005-11-07 17:20:48 -0500 | [diff] [blame] | 202 | #define MS_SLAVE (1<<19) /* change to slave */ |
Ram Pai | 03e06e6 | 2005-11-07 17:19:33 -0500 | [diff] [blame] | 203 | #define MS_SHARED (1<<20) /* change to shared */ |
Valerie Henson | 47ae32d | 2006-12-13 00:34:34 -0800 | [diff] [blame] | 204 | #define MS_RELATIME (1<<21) /* Update atime relative to mtime/ctime. */ |
Pavel Emelyanov | 8bf9725 | 2007-10-18 23:40:02 -0700 | [diff] [blame] | 205 | #define MS_KERNMOUNT (1<<22) /* this is a kern_mount call */ |
Jean Noel Cordenner | 7a22422 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 206 | #define MS_I_VERSION (1<<23) /* Update inode I_version field */ |
Matthew Garrett | d0adde5 | 2009-03-26 17:49:56 +0000 | [diff] [blame] | 207 | #define MS_STRICTATIME (1<<24) /* Always perform atime updates */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | #define MS_ACTIVE (1<<30) |
| 209 | #define MS_NOUSER (1<<31) |
| 210 | |
| 211 | /* |
| 212 | * Superblock flags that can be altered by MS_REMOUNT |
| 213 | */ |
Mimi Zohar | 08b9fe6 | 2008-10-13 00:09:50 -0400 | [diff] [blame] | 214 | #define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_I_VERSION) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | |
| 216 | /* |
| 217 | * Old magic mount flag and mask |
| 218 | */ |
| 219 | #define MS_MGC_VAL 0xC0ED0000 |
| 220 | #define MS_MGC_MSK 0xffff0000 |
| 221 | |
| 222 | /* Inode flags - they have nothing to superblock flags now */ |
| 223 | |
| 224 | #define S_SYNC 1 /* Writes are synced at once */ |
| 225 | #define S_NOATIME 2 /* Do not update access times */ |
| 226 | #define S_APPEND 4 /* Append-only file */ |
| 227 | #define S_IMMUTABLE 8 /* Immutable file */ |
| 228 | #define S_DEAD 16 /* removed, but still open directory */ |
| 229 | #define S_NOQUOTA 32 /* Inode is not counted to quota */ |
| 230 | #define S_DIRSYNC 64 /* Directory modifications are synchronous */ |
| 231 | #define S_NOCMTIME 128 /* Do not update file c/mtime */ |
| 232 | #define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */ |
| 233 | #define S_PRIVATE 512 /* Inode is fs-internal */ |
| 234 | |
| 235 | /* |
| 236 | * Note that nosuid etc flags are inode-specific: setting some file-system |
| 237 | * flags just means all the inodes inherit those flags by default. It might be |
| 238 | * possible to override it selectively if you really wanted to with some |
| 239 | * ioctl() that is not currently implemented. |
| 240 | * |
| 241 | * Exception: MS_RDONLY is always applied to the entire file system. |
| 242 | * |
| 243 | * Unfortunately, it is possible to change a filesystems flags with it mounted |
| 244 | * with files in use. This means that all of the inodes will not have their |
| 245 | * i_flags updated. Hence, i_flags no longer inherit the superblock mount |
| 246 | * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org |
| 247 | */ |
| 248 | #define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg)) |
| 249 | |
| 250 | #define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY) |
| 251 | #define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \ |
| 252 | ((inode)->i_flags & S_SYNC)) |
| 253 | #define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \ |
| 254 | ((inode)->i_flags & (S_SYNC|S_DIRSYNC))) |
| 255 | #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK) |
Eric Dumazet | 37756ce | 2007-02-10 01:44:49 -0800 | [diff] [blame] | 256 | #define IS_NOATIME(inode) __IS_FLG(inode, MS_RDONLY|MS_NOATIME) |
Jean Noel Cordenner | 7a22422 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 257 | #define IS_I_VERSION(inode) __IS_FLG(inode, MS_I_VERSION) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | |
| 259 | #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA) |
| 260 | #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND) |
| 261 | #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | #define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL) |
| 263 | |
| 264 | #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD) |
| 265 | #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME) |
| 266 | #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE) |
| 267 | #define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE) |
| 268 | |
| 269 | /* the read-only stuff doesn't really belong here, but any other place is |
| 270 | probably as bad and I don't want to create yet another include file. */ |
| 271 | |
| 272 | #define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */ |
| 273 | #define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */ |
| 274 | #define BLKRRPART _IO(0x12,95) /* re-read partition table */ |
| 275 | #define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */ |
| 276 | #define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */ |
| 277 | #define BLKRASET _IO(0x12,98) /* set read ahead for block device */ |
| 278 | #define BLKRAGET _IO(0x12,99) /* get current read ahead setting */ |
| 279 | #define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */ |
| 280 | #define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */ |
| 281 | #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */ |
| 282 | #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */ |
| 283 | #define BLKSSZGET _IO(0x12,104)/* get block device sector size */ |
| 284 | #if 0 |
| 285 | #define BLKPG _IO(0x12,105)/* See blkpg.h */ |
| 286 | |
| 287 | /* Some people are morons. Do not use sizeof! */ |
| 288 | |
| 289 | #define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */ |
| 290 | #define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */ |
| 291 | /* This was here just to show that the number is taken - |
| 292 | probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */ |
| 293 | #endif |
| 294 | /* A jump here: 108-111 have been used for various private purposes. */ |
| 295 | #define BLKBSZGET _IOR(0x12,112,size_t) |
| 296 | #define BLKBSZSET _IOW(0x12,113,size_t) |
| 297 | #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */ |
Jens Axboe | 2056a78 | 2006-03-23 20:00:26 +0100 | [diff] [blame] | 298 | #define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup) |
| 299 | #define BLKTRACESTART _IO(0x12,116) |
| 300 | #define BLKTRACESTOP _IO(0x12,117) |
| 301 | #define BLKTRACETEARDOWN _IO(0x12,118) |
David Woodhouse | d30a260 | 2008-08-11 15:58:42 +0100 | [diff] [blame] | 302 | #define BLKDISCARD _IO(0x12,119) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | |
| 304 | #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */ |
| 305 | #define FIBMAP _IO(0x00,1) /* bmap access */ |
| 306 | #define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */ |
Takashi Sato | fcccf50 | 2009-01-09 16:40:59 -0800 | [diff] [blame] | 307 | #define FIFREEZE _IOWR('X', 119, int) /* Freeze */ |
| 308 | #define FITHAW _IOWR('X', 120, int) /* Thaw */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | |
David Howells | 3669567 | 2006-08-29 19:06:16 +0100 | [diff] [blame] | 310 | #define FS_IOC_GETFLAGS _IOR('f', 1, long) |
| 311 | #define FS_IOC_SETFLAGS _IOW('f', 2, long) |
| 312 | #define FS_IOC_GETVERSION _IOR('v', 1, long) |
| 313 | #define FS_IOC_SETVERSION _IOW('v', 2, long) |
Mark Fasheh | c4b929b | 2008-10-08 19:44:18 -0400 | [diff] [blame] | 314 | #define FS_IOC_FIEMAP _IOWR('f', 11, struct fiemap) |
David Howells | 3669567 | 2006-08-29 19:06:16 +0100 | [diff] [blame] | 315 | #define FS_IOC32_GETFLAGS _IOR('f', 1, int) |
| 316 | #define FS_IOC32_SETFLAGS _IOW('f', 2, int) |
| 317 | #define FS_IOC32_GETVERSION _IOR('v', 1, int) |
| 318 | #define FS_IOC32_SETVERSION _IOW('v', 2, int) |
| 319 | |
| 320 | /* |
| 321 | * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS) |
| 322 | */ |
| 323 | #define FS_SECRM_FL 0x00000001 /* Secure deletion */ |
| 324 | #define FS_UNRM_FL 0x00000002 /* Undelete */ |
| 325 | #define FS_COMPR_FL 0x00000004 /* Compress file */ |
| 326 | #define FS_SYNC_FL 0x00000008 /* Synchronous updates */ |
| 327 | #define FS_IMMUTABLE_FL 0x00000010 /* Immutable file */ |
| 328 | #define FS_APPEND_FL 0x00000020 /* writes to file may only append */ |
| 329 | #define FS_NODUMP_FL 0x00000040 /* do not dump file */ |
| 330 | #define FS_NOATIME_FL 0x00000080 /* do not update atime */ |
| 331 | /* Reserved for compression usage... */ |
| 332 | #define FS_DIRTY_FL 0x00000100 |
| 333 | #define FS_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ |
| 334 | #define FS_NOCOMP_FL 0x00000400 /* Don't compress */ |
| 335 | #define FS_ECOMPR_FL 0x00000800 /* Compression error */ |
| 336 | /* End compression flags --- maybe not all used */ |
| 337 | #define FS_BTREE_FL 0x00001000 /* btree format dir */ |
| 338 | #define FS_INDEX_FL 0x00001000 /* hash-indexed directory */ |
| 339 | #define FS_IMAGIC_FL 0x00002000 /* AFS directory */ |
| 340 | #define FS_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */ |
| 341 | #define FS_NOTAIL_FL 0x00008000 /* file tail should not be merged */ |
| 342 | #define FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ |
| 343 | #define FS_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ |
Steven Whitehouse | 128e5eb | 2006-10-02 11:24:43 -0400 | [diff] [blame] | 344 | #define FS_EXTENT_FL 0x00080000 /* Extents */ |
| 345 | #define FS_DIRECTIO_FL 0x00100000 /* Use direct i/o */ |
David Howells | 3669567 | 2006-08-29 19:06:16 +0100 | [diff] [blame] | 346 | #define FS_RESERVED_FL 0x80000000 /* reserved for ext2 lib */ |
| 347 | |
| 348 | #define FS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */ |
| 349 | #define FS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */ |
| 350 | |
| 351 | |
Andrew Morton | e46e490 | 2006-05-22 22:35:24 -0700 | [diff] [blame] | 352 | #define SYNC_FILE_RANGE_WAIT_BEFORE 1 |
| 353 | #define SYNC_FILE_RANGE_WRITE 2 |
| 354 | #define SYNC_FILE_RANGE_WAIT_AFTER 4 |
| 355 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | #ifdef __KERNEL__ |
| 357 | |
| 358 | #include <linux/linkage.h> |
| 359 | #include <linux/wait.h> |
| 360 | #include <linux/types.h> |
| 361 | #include <linux/kdev_t.h> |
| 362 | #include <linux/dcache.h> |
Al Viro | 3f8206d | 2008-07-26 03:46:43 -0400 | [diff] [blame] | 363 | #include <linux/path.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | #include <linux/stat.h> |
| 365 | #include <linux/cache.h> |
| 366 | #include <linux/kobject.h> |
| 367 | #include <linux/list.h> |
| 368 | #include <linux/radix-tree.h> |
| 369 | #include <linux/prio_tree.h> |
| 370 | #include <linux/init.h> |
Al Viro | 914e263 | 2006-10-18 13:55:46 -0400 | [diff] [blame] | 371 | #include <linux/pid.h> |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 372 | #include <linux/mutex.h> |
Satyam Sharma | 3bd858a | 2007-07-17 15:00:08 +0530 | [diff] [blame] | 373 | #include <linux/capability.h> |
Matthew Wilcox | 6188e10 | 2008-04-18 22:21:05 -0400 | [diff] [blame] | 374 | #include <linux/semaphore.h> |
Mark Fasheh | c4b929b | 2008-10-08 19:44:18 -0400 | [diff] [blame] | 375 | #include <linux/fiemap.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | |
| 377 | #include <asm/atomic.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | #include <asm/byteorder.h> |
| 379 | |
Christoph Hellwig | a569425 | 2007-07-17 04:04:28 -0700 | [diff] [blame] | 380 | struct export_operations; |
Christoph Hellwig | a885c8c | 2006-01-08 01:02:50 -0800 | [diff] [blame] | 381 | struct hd_geometry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | struct iovec; |
| 383 | struct nameidata; |
Christoph Hellwig | 92198f7 | 2005-06-23 22:00:59 -0700 | [diff] [blame] | 384 | struct kiocb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | struct pipe_inode_info; |
| 386 | struct poll_table_struct; |
| 387 | struct kstatfs; |
| 388 | struct vm_area_struct; |
| 389 | struct vfsmount; |
David Howells | 745ca24 | 2008-11-14 10:39:22 +1100 | [diff] [blame] | 390 | struct cred; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | |
Denis Cheng | 74bf17c | 2007-10-16 23:26:30 -0700 | [diff] [blame] | 392 | extern void __init inode_init(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | extern void __init inode_init_early(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | extern void __init files_init(unsigned long); |
| 395 | |
Jan Engelhardt | dded4f4 | 2008-12-01 14:34:50 -0800 | [diff] [blame] | 396 | extern struct files_stat_struct files_stat; |
| 397 | extern int get_max_files(void); |
| 398 | extern int sysctl_nr_open; |
| 399 | extern struct inodes_stat_t inodes_stat; |
| 400 | extern int leases_enable, lease_break_time; |
| 401 | #ifdef CONFIG_DNOTIFY |
| 402 | extern int dir_notify_enable; |
| 403 | #endif |
| 404 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | struct buffer_head; |
| 406 | typedef int (get_block_t)(struct inode *inode, sector_t iblock, |
| 407 | struct buffer_head *bh_result, int create); |
Christoph Hellwig | 92198f7 | 2005-06-23 22:00:59 -0700 | [diff] [blame] | 408 | typedef void (dio_iodone_t)(struct kiocb *iocb, loff_t offset, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | ssize_t bytes, void *private); |
| 410 | |
| 411 | /* |
| 412 | * Attribute flags. These should be or-ed together to figure out what |
| 413 | * has been changed! |
| 414 | */ |
Miklos Szeredi | 9767d74 | 2008-07-01 15:01:26 +0200 | [diff] [blame] | 415 | #define ATTR_MODE (1 << 0) |
| 416 | #define ATTR_UID (1 << 1) |
| 417 | #define ATTR_GID (1 << 2) |
| 418 | #define ATTR_SIZE (1 << 3) |
| 419 | #define ATTR_ATIME (1 << 4) |
| 420 | #define ATTR_MTIME (1 << 5) |
| 421 | #define ATTR_CTIME (1 << 6) |
| 422 | #define ATTR_ATIME_SET (1 << 7) |
| 423 | #define ATTR_MTIME_SET (1 << 8) |
| 424 | #define ATTR_FORCE (1 << 9) /* Not a change, but a change it */ |
| 425 | #define ATTR_ATTR_FLAG (1 << 10) |
| 426 | #define ATTR_KILL_SUID (1 << 11) |
| 427 | #define ATTR_KILL_SGID (1 << 12) |
| 428 | #define ATTR_FILE (1 << 13) |
| 429 | #define ATTR_KILL_PRIV (1 << 14) |
| 430 | #define ATTR_OPEN (1 << 15) /* Truncating from open(O_TRUNC) */ |
| 431 | #define ATTR_TIMES_SET (1 << 16) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | |
| 433 | /* |
| 434 | * This is the Inode Attributes structure, used for notify_change(). It |
| 435 | * uses the above definitions as flags, to know which values have changed. |
| 436 | * Also, in this manner, a Filesystem can look at only the values it cares |
| 437 | * about. Basically, these are the attributes that the VFS layer can |
| 438 | * request to change from the FS layer. |
| 439 | * |
| 440 | * Derek Atkins <warlord@MIT.EDU> 94-10-20 |
| 441 | */ |
| 442 | struct iattr { |
| 443 | unsigned int ia_valid; |
| 444 | umode_t ia_mode; |
| 445 | uid_t ia_uid; |
| 446 | gid_t ia_gid; |
| 447 | loff_t ia_size; |
| 448 | struct timespec ia_atime; |
| 449 | struct timespec ia_mtime; |
| 450 | struct timespec ia_ctime; |
Miklos Szeredi | cc4e69d | 2005-11-07 00:59:49 -0800 | [diff] [blame] | 451 | |
| 452 | /* |
| 453 | * Not an attribute, but an auxilary info for filesystems wanting to |
| 454 | * implement an ftruncate() like method. NOTE: filesystem should |
| 455 | * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL). |
| 456 | */ |
| 457 | struct file *ia_file; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | }; |
| 459 | |
| 460 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | * Includes for diskquotas. |
| 462 | */ |
| 463 | #include <linux/quota.h> |
| 464 | |
Zach Brown | 994fc28c | 2005-12-15 14:28:17 -0800 | [diff] [blame] | 465 | /** |
| 466 | * enum positive_aop_returns - aop return codes with specific semantics |
| 467 | * |
| 468 | * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has |
| 469 | * completed, that the page is still locked, and |
| 470 | * should be considered active. The VM uses this hint |
| 471 | * to return the page to the active list -- it won't |
| 472 | * be a candidate for writeback again in the near |
| 473 | * future. Other callers must be careful to unlock |
| 474 | * the page if they get this return. Returned by |
| 475 | * writepage(); |
| 476 | * |
| 477 | * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has |
| 478 | * unlocked it and the page might have been truncated. |
| 479 | * The caller should back up to acquiring a new page and |
| 480 | * trying again. The aop will be taking reasonable |
| 481 | * precautions not to livelock. If the caller held a page |
| 482 | * reference, it should drop it before retrying. Returned |
Nick Piggin | 5514476 | 2007-10-16 01:25:26 -0700 | [diff] [blame] | 483 | * by readpage(). |
Zach Brown | 994fc28c | 2005-12-15 14:28:17 -0800 | [diff] [blame] | 484 | * |
| 485 | * address_space_operation functions return these large constants to indicate |
| 486 | * special semantics to the caller. These are much larger than the bytes in a |
| 487 | * page to allow for functions that return the number of bytes operated on in a |
| 488 | * given page. |
| 489 | */ |
| 490 | |
| 491 | enum positive_aop_returns { |
| 492 | AOP_WRITEPAGE_ACTIVATE = 0x80000, |
| 493 | AOP_TRUNCATED_PAGE = 0x80001, |
| 494 | }; |
| 495 | |
Nick Piggin | afddba4 | 2007-10-16 01:25:01 -0700 | [diff] [blame] | 496 | #define AOP_FLAG_UNINTERRUPTIBLE 0x0001 /* will not do a short write */ |
Nick Piggin | 89e1078 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 497 | #define AOP_FLAG_CONT_EXPAND 0x0002 /* called from cont_expand */ |
Nick Piggin | 54566b2 | 2009-01-04 12:00:53 -0800 | [diff] [blame] | 498 | #define AOP_FLAG_NOFS 0x0004 /* used by filesystem to direct |
| 499 | * helper code (eg buffer layer) |
| 500 | * to clear GFP_FS from alloc */ |
Nick Piggin | afddba4 | 2007-10-16 01:25:01 -0700 | [diff] [blame] | 501 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | /* |
| 503 | * oh the beauties of C type declarations. |
| 504 | */ |
| 505 | struct page; |
| 506 | struct address_space; |
| 507 | struct writeback_control; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | |
Nick Piggin | 2f718ff | 2007-10-16 01:24:59 -0700 | [diff] [blame] | 509 | struct iov_iter { |
| 510 | const struct iovec *iov; |
| 511 | unsigned long nr_segs; |
| 512 | size_t iov_offset; |
| 513 | size_t count; |
| 514 | }; |
| 515 | |
| 516 | size_t iov_iter_copy_from_user_atomic(struct page *page, |
| 517 | struct iov_iter *i, unsigned long offset, size_t bytes); |
| 518 | size_t iov_iter_copy_from_user(struct page *page, |
| 519 | struct iov_iter *i, unsigned long offset, size_t bytes); |
| 520 | void iov_iter_advance(struct iov_iter *i, size_t bytes); |
Nick Piggin | afddba4 | 2007-10-16 01:25:01 -0700 | [diff] [blame] | 521 | int iov_iter_fault_in_readable(struct iov_iter *i, size_t bytes); |
Nick Piggin | 2f718ff | 2007-10-16 01:24:59 -0700 | [diff] [blame] | 522 | size_t iov_iter_single_seg_count(struct iov_iter *i); |
| 523 | |
| 524 | static inline void iov_iter_init(struct iov_iter *i, |
| 525 | const struct iovec *iov, unsigned long nr_segs, |
| 526 | size_t count, size_t written) |
| 527 | { |
| 528 | i->iov = iov; |
| 529 | i->nr_segs = nr_segs; |
| 530 | i->iov_offset = 0; |
| 531 | i->count = count + written; |
| 532 | |
| 533 | iov_iter_advance(i, written); |
| 534 | } |
| 535 | |
| 536 | static inline size_t iov_iter_count(struct iov_iter *i) |
| 537 | { |
| 538 | return i->count; |
| 539 | } |
| 540 | |
Hisashi Hifumi | 8ab22b9 | 2008-07-28 15:46:36 -0700 | [diff] [blame] | 541 | /* |
| 542 | * "descriptor" for what we're up to with a read. |
| 543 | * This allows us to use the same read code yet |
| 544 | * have multiple different users of the data that |
| 545 | * we read from a file. |
| 546 | * |
| 547 | * The simplest case just copies the data to user |
| 548 | * mode. |
| 549 | */ |
| 550 | typedef struct { |
| 551 | size_t written; |
| 552 | size_t count; |
| 553 | union { |
| 554 | char __user *buf; |
| 555 | void *data; |
| 556 | } arg; |
| 557 | int error; |
| 558 | } read_descriptor_t; |
| 559 | |
| 560 | typedef int (*read_actor_t)(read_descriptor_t *, struct page *, |
| 561 | unsigned long, unsigned long); |
Nick Piggin | 2f718ff | 2007-10-16 01:24:59 -0700 | [diff] [blame] | 562 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | struct address_space_operations { |
| 564 | int (*writepage)(struct page *page, struct writeback_control *wbc); |
| 565 | int (*readpage)(struct file *, struct page *); |
NeilBrown | 3978d71 | 2006-03-26 01:37:17 -0800 | [diff] [blame] | 566 | void (*sync_page)(struct page *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | |
| 568 | /* Write back some dirty pages from this mapping. */ |
| 569 | int (*writepages)(struct address_space *, struct writeback_control *); |
| 570 | |
Andrew Morton | 4741c9f | 2006-03-24 03:18:11 -0800 | [diff] [blame] | 571 | /* Set a page dirty. Return true if this dirtied it */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | int (*set_page_dirty)(struct page *page); |
| 573 | |
| 574 | int (*readpages)(struct file *filp, struct address_space *mapping, |
| 575 | struct list_head *pages, unsigned nr_pages); |
| 576 | |
Nick Piggin | afddba4 | 2007-10-16 01:25:01 -0700 | [diff] [blame] | 577 | int (*write_begin)(struct file *, struct address_space *mapping, |
| 578 | loff_t pos, unsigned len, unsigned flags, |
| 579 | struct page **pagep, void **fsdata); |
| 580 | int (*write_end)(struct file *, struct address_space *mapping, |
| 581 | loff_t pos, unsigned len, unsigned copied, |
| 582 | struct page *page, void *fsdata); |
| 583 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | /* Unfortunately this kludge is needed for FIBMAP. Don't use it */ |
| 585 | sector_t (*bmap)(struct address_space *, sector_t); |
NeilBrown | 2ff28e2 | 2006-03-26 01:37:18 -0800 | [diff] [blame] | 586 | void (*invalidatepage) (struct page *, unsigned long); |
Al Viro | 27496a8 | 2005-10-21 03:20:48 -0400 | [diff] [blame] | 587 | int (*releasepage) (struct page *, gfp_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | ssize_t (*direct_IO)(int, struct kiocb *, const struct iovec *iov, |
| 589 | loff_t offset, unsigned long nr_segs); |
Nick Piggin | 70688e4 | 2008-04-28 02:13:02 -0700 | [diff] [blame] | 590 | int (*get_xip_mem)(struct address_space *, pgoff_t, int, |
| 591 | void **, unsigned long *); |
Christoph Lameter | e965f96 | 2006-02-01 03:05:41 -0800 | [diff] [blame] | 592 | /* migrate the contents of a page to the specified target */ |
Christoph Lameter | 2d1db3b | 2006-06-23 02:03:33 -0700 | [diff] [blame] | 593 | int (*migratepage) (struct address_space *, |
| 594 | struct page *, struct page *); |
Trond Myklebust | e3db769 | 2007-01-10 23:15:39 -0800 | [diff] [blame] | 595 | int (*launder_page) (struct page *); |
Hisashi Hifumi | 8ab22b9 | 2008-07-28 15:46:36 -0700 | [diff] [blame] | 596 | int (*is_partially_uptodate) (struct page *, read_descriptor_t *, |
| 597 | unsigned long); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 598 | }; |
| 599 | |
Nick Piggin | afddba4 | 2007-10-16 01:25:01 -0700 | [diff] [blame] | 600 | /* |
| 601 | * pagecache_write_begin/pagecache_write_end must be used by general code |
| 602 | * to write into the pagecache. |
| 603 | */ |
| 604 | int pagecache_write_begin(struct file *, struct address_space *mapping, |
| 605 | loff_t pos, unsigned len, unsigned flags, |
| 606 | struct page **pagep, void **fsdata); |
| 607 | |
| 608 | int pagecache_write_end(struct file *, struct address_space *mapping, |
| 609 | loff_t pos, unsigned len, unsigned copied, |
| 610 | struct page *page, void *fsdata); |
| 611 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | struct backing_dev_info; |
| 613 | struct address_space { |
| 614 | struct inode *host; /* owner: inode, block_device */ |
| 615 | struct radix_tree_root page_tree; /* radix tree of all pages */ |
Nick Piggin | 19fd623 | 2008-07-25 19:45:32 -0700 | [diff] [blame] | 616 | spinlock_t tree_lock; /* and lock protecting it */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | unsigned int i_mmap_writable;/* count VM_SHARED mappings */ |
| 618 | struct prio_tree_root i_mmap; /* tree of private and shared mappings */ |
| 619 | struct list_head i_mmap_nonlinear;/*list VM_NONLINEAR mappings */ |
| 620 | spinlock_t i_mmap_lock; /* protect tree, count, list */ |
| 621 | unsigned int truncate_count; /* Cover race condition with truncate */ |
| 622 | unsigned long nrpages; /* number of total pages */ |
| 623 | pgoff_t writeback_index;/* writeback starts here */ |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 624 | const struct address_space_operations *a_ops; /* methods */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | unsigned long flags; /* error bits/gfp mask */ |
| 626 | struct backing_dev_info *backing_dev_info; /* device readahead, etc */ |
| 627 | spinlock_t private_lock; /* for use by the address_space */ |
| 628 | struct list_head private_list; /* ditto */ |
| 629 | struct address_space *assoc_mapping; /* ditto */ |
| 630 | } __attribute__((aligned(sizeof(long)))); |
| 631 | /* |
| 632 | * On most architectures that alignment is already the case; but |
| 633 | * must be enforced here for CRIS, to let the least signficant bit |
| 634 | * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON. |
| 635 | */ |
| 636 | |
| 637 | struct block_device { |
| 638 | dev_t bd_dev; /* not a kdev_t - it's a search key */ |
| 639 | struct inode * bd_inode; /* will die */ |
Theodore Ts'o | 87d8fe1 | 2009-01-03 09:47:09 -0500 | [diff] [blame] | 640 | struct super_block * bd_super; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | int bd_openers; |
Arjan van de Ven | c039e31 | 2006-03-23 03:00:28 -0800 | [diff] [blame] | 642 | struct mutex bd_mutex; /* open/close mutex */ |
David Chinner | f73ca1b | 2007-01-10 23:15:41 -0800 | [diff] [blame] | 643 | struct semaphore bd_mount_sem; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | struct list_head bd_inodes; |
| 645 | void * bd_holder; |
| 646 | int bd_holders; |
Jun'ichi Nomura | 641dc63 | 2006-03-27 01:17:57 -0800 | [diff] [blame] | 647 | #ifdef CONFIG_SYSFS |
| 648 | struct list_head bd_holder_list; |
| 649 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | struct block_device * bd_contains; |
| 651 | unsigned bd_block_size; |
| 652 | struct hd_struct * bd_part; |
| 653 | /* number of times partitions within this device have been opened. */ |
| 654 | unsigned bd_part_count; |
| 655 | int bd_invalidated; |
| 656 | struct gendisk * bd_disk; |
| 657 | struct list_head bd_list; |
| 658 | struct backing_dev_info *bd_inode_backing_dev_info; |
| 659 | /* |
| 660 | * Private data. You must have bd_claim'ed the block_device |
| 661 | * to use this. NOTE: bd_claim allows an owner to claim |
| 662 | * the same device multiple times, the owner must take special |
| 663 | * care to not mess up bd_private for that case. |
| 664 | */ |
| 665 | unsigned long bd_private; |
Takashi Sato | fcccf50 | 2009-01-09 16:40:59 -0800 | [diff] [blame] | 666 | |
| 667 | /* The counter of freeze processes */ |
| 668 | int bd_fsfreeze_count; |
| 669 | /* Mutex for freeze */ |
| 670 | struct mutex bd_fsfreeze_mutex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | }; |
| 672 | |
| 673 | /* |
| 674 | * Radix-tree tags, for tagging dirty and writeback pages within the pagecache |
| 675 | * radix trees |
| 676 | */ |
| 677 | #define PAGECACHE_TAG_DIRTY 0 |
| 678 | #define PAGECACHE_TAG_WRITEBACK 1 |
| 679 | |
| 680 | int mapping_tagged(struct address_space *mapping, int tag); |
| 681 | |
| 682 | /* |
| 683 | * Might pages of this file be mapped into userspace? |
| 684 | */ |
| 685 | static inline int mapping_mapped(struct address_space *mapping) |
| 686 | { |
| 687 | return !prio_tree_empty(&mapping->i_mmap) || |
| 688 | !list_empty(&mapping->i_mmap_nonlinear); |
| 689 | } |
| 690 | |
| 691 | /* |
| 692 | * Might pages of this file have been modified in userspace? |
| 693 | * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff |
| 694 | * marks vma as VM_SHARED if it is shared, and the file was opened for |
| 695 | * writing i.e. vma may be mprotected writable even if now readonly. |
| 696 | */ |
| 697 | static inline int mapping_writably_mapped(struct address_space *mapping) |
| 698 | { |
| 699 | return mapping->i_mmap_writable != 0; |
| 700 | } |
| 701 | |
| 702 | /* |
| 703 | * Use sequence counter to get consistent i_size on 32-bit processors. |
| 704 | */ |
| 705 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) |
| 706 | #include <linux/seqlock.h> |
| 707 | #define __NEED_I_SIZE_ORDERED |
| 708 | #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount) |
| 709 | #else |
| 710 | #define i_size_ordered_init(inode) do { } while (0) |
| 711 | #endif |
| 712 | |
| 713 | struct inode { |
| 714 | struct hlist_node i_hash; |
| 715 | struct list_head i_list; |
| 716 | struct list_head i_sb_list; |
| 717 | struct list_head i_dentry; |
| 718 | unsigned long i_ino; |
| 719 | atomic_t i_count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 720 | unsigned int i_nlink; |
| 721 | uid_t i_uid; |
| 722 | gid_t i_gid; |
| 723 | dev_t i_rdev; |
Jean Noel Cordenner | 7a22422 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 724 | u64 i_version; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | loff_t i_size; |
Eric Dumazet | 83b7b44 | 2006-12-06 20:38:53 -0800 | [diff] [blame] | 726 | #ifdef __NEED_I_SIZE_ORDERED |
| 727 | seqcount_t i_size_seqcount; |
| 728 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 729 | struct timespec i_atime; |
| 730 | struct timespec i_mtime; |
| 731 | struct timespec i_ctime; |
| 732 | unsigned int i_blkbits; |
Takashi Sato | a0f62ac | 2006-03-26 01:37:52 -0800 | [diff] [blame] | 733 | blkcnt_t i_blocks; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | unsigned short i_bytes; |
Arnaldo Carvalho de Melo | 12d40e4 | 2006-12-06 20:39:53 -0800 | [diff] [blame] | 735 | umode_t i_mode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */ |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 737 | struct mutex i_mutex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | struct rw_semaphore i_alloc_sem; |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 739 | const struct inode_operations *i_op; |
Arjan van de Ven | 99ac48f | 2006-03-28 01:56:41 -0800 | [diff] [blame] | 740 | const struct file_operations *i_fop; /* former ->i_op->default_file_ops */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 741 | struct super_block *i_sb; |
| 742 | struct file_lock *i_flock; |
| 743 | struct address_space *i_mapping; |
| 744 | struct address_space i_data; |
| 745 | #ifdef CONFIG_QUOTA |
| 746 | struct dquot *i_dquot[MAXQUOTAS]; |
| 747 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 748 | struct list_head i_devices; |
Theodore Ts'o | 4c15416 | 2006-09-27 01:50:47 -0700 | [diff] [blame] | 749 | union { |
| 750 | struct pipe_inode_info *i_pipe; |
Theodore Ts'o | eaf796e | 2006-09-27 01:50:48 -0700 | [diff] [blame] | 751 | struct block_device *i_bdev; |
Theodore Ts'o | 577c4eb | 2006-09-27 01:50:49 -0700 | [diff] [blame] | 752 | struct cdev *i_cdev; |
Theodore Ts'o | 4c15416 | 2006-09-27 01:50:47 -0700 | [diff] [blame] | 753 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | int i_cindex; |
| 755 | |
| 756 | __u32 i_generation; |
| 757 | |
| 758 | #ifdef CONFIG_DNOTIFY |
| 759 | unsigned long i_dnotify_mask; /* Directory notify events */ |
| 760 | struct dnotify_struct *i_dnotify; /* for directory notifications */ |
| 761 | #endif |
| 762 | |
Robert Love | 0eeca28 | 2005-07-12 17:06:03 -0400 | [diff] [blame] | 763 | #ifdef CONFIG_INOTIFY |
| 764 | struct list_head inotify_watches; /* watches on this inode */ |
Ingo Molnar | d4f9af9 | 2006-03-23 03:00:30 -0800 | [diff] [blame] | 765 | struct mutex inotify_mutex; /* protects the watches list */ |
Robert Love | 0eeca28 | 2005-07-12 17:06:03 -0400 | [diff] [blame] | 766 | #endif |
| 767 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | unsigned long i_state; |
| 769 | unsigned long dirtied_when; /* jiffies of first dirtying */ |
| 770 | |
| 771 | unsigned int i_flags; |
| 772 | |
| 773 | atomic_t i_writecount; |
Alexey Dobriyan | 5046206 | 2006-09-29 02:00:01 -0700 | [diff] [blame] | 774 | #ifdef CONFIG_SECURITY |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 775 | void *i_security; |
Alexey Dobriyan | 5046206 | 2006-09-29 02:00:01 -0700 | [diff] [blame] | 776 | #endif |
Theodore Ts'o | 8e18e29 | 2006-09-27 01:50:46 -0700 | [diff] [blame] | 777 | void *i_private; /* fs or device private pointer */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 778 | }; |
| 779 | |
| 780 | /* |
Ingo Molnar | f2eace2 | 2006-07-03 00:25:05 -0700 | [diff] [blame] | 781 | * inode->i_mutex nesting subclasses for the lock validator: |
| 782 | * |
| 783 | * 0: the object of the current VFS operation |
| 784 | * 1: parent |
| 785 | * 2: child/target |
| 786 | * 3: quota file |
| 787 | * |
| 788 | * The locking order between these classes is |
Ingo Molnar | 4df4624 | 2006-08-27 01:23:56 -0700 | [diff] [blame] | 789 | * parent -> child -> normal -> xattr -> quota |
Ingo Molnar | f2eace2 | 2006-07-03 00:25:05 -0700 | [diff] [blame] | 790 | */ |
| 791 | enum inode_i_mutex_lock_class |
| 792 | { |
| 793 | I_MUTEX_NORMAL, |
| 794 | I_MUTEX_PARENT, |
| 795 | I_MUTEX_CHILD, |
Ingo Molnar | 4df4624 | 2006-08-27 01:23:56 -0700 | [diff] [blame] | 796 | I_MUTEX_XATTR, |
Ingo Molnar | f2eace2 | 2006-07-03 00:25:05 -0700 | [diff] [blame] | 797 | I_MUTEX_QUOTA |
| 798 | }; |
| 799 | |
Mark Fasheh | 62752ee | 2006-10-17 10:31:38 +0200 | [diff] [blame] | 800 | extern void inode_double_lock(struct inode *inode1, struct inode *inode2); |
| 801 | extern void inode_double_unlock(struct inode *inode1, struct inode *inode2); |
| 802 | |
Ingo Molnar | f2eace2 | 2006-07-03 00:25:05 -0700 | [diff] [blame] | 803 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 804 | * NOTE: in a 32bit arch with a preemptable kernel and |
| 805 | * an UP compile the i_size_read/write must be atomic |
| 806 | * with respect to the local cpu (unlike with preempt disabled), |
| 807 | * but they don't need to be atomic with respect to other cpus like in |
| 808 | * true SMP (so they need either to either locally disable irq around |
| 809 | * the read or for example on x86 they can be still implemented as a |
| 810 | * cmpxchg8b without the need of the lock prefix). For SMP compiles |
| 811 | * and 64bit archs it makes no difference if preempt is enabled or not. |
| 812 | */ |
Jan Engelhardt | 48ed214 | 2006-12-06 20:35:37 -0800 | [diff] [blame] | 813 | static inline loff_t i_size_read(const struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 814 | { |
| 815 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) |
| 816 | loff_t i_size; |
| 817 | unsigned int seq; |
| 818 | |
| 819 | do { |
| 820 | seq = read_seqcount_begin(&inode->i_size_seqcount); |
| 821 | i_size = inode->i_size; |
| 822 | } while (read_seqcount_retry(&inode->i_size_seqcount, seq)); |
| 823 | return i_size; |
| 824 | #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) |
| 825 | loff_t i_size; |
| 826 | |
| 827 | preempt_disable(); |
| 828 | i_size = inode->i_size; |
| 829 | preempt_enable(); |
| 830 | return i_size; |
| 831 | #else |
| 832 | return inode->i_size; |
| 833 | #endif |
| 834 | } |
| 835 | |
Miklos Szeredi | 7762f5a | 2006-10-17 00:10:07 -0700 | [diff] [blame] | 836 | /* |
| 837 | * NOTE: unlike i_size_read(), i_size_write() does need locking around it |
| 838 | * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount |
| 839 | * can be lost, resulting in subsequent i_size_read() calls spinning forever. |
| 840 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 841 | static inline void i_size_write(struct inode *inode, loff_t i_size) |
| 842 | { |
| 843 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) |
| 844 | write_seqcount_begin(&inode->i_size_seqcount); |
| 845 | inode->i_size = i_size; |
| 846 | write_seqcount_end(&inode->i_size_seqcount); |
| 847 | #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) |
| 848 | preempt_disable(); |
| 849 | inode->i_size = i_size; |
| 850 | preempt_enable(); |
| 851 | #else |
| 852 | inode->i_size = i_size; |
| 853 | #endif |
| 854 | } |
| 855 | |
Jan Engelhardt | 48ed214 | 2006-12-06 20:35:37 -0800 | [diff] [blame] | 856 | static inline unsigned iminor(const struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 857 | { |
| 858 | return MINOR(inode->i_rdev); |
| 859 | } |
| 860 | |
Jan Engelhardt | 48ed214 | 2006-12-06 20:35:37 -0800 | [diff] [blame] | 861 | static inline unsigned imajor(const struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 862 | { |
| 863 | return MAJOR(inode->i_rdev); |
| 864 | } |
| 865 | |
| 866 | extern struct block_device *I_BDEV(struct inode *inode); |
| 867 | |
| 868 | struct fown_struct { |
| 869 | rwlock_t lock; /* protects pid, uid, euid fields */ |
Eric W. Biederman | 609d7fa | 2006-10-02 02:17:15 -0700 | [diff] [blame] | 870 | struct pid *pid; /* pid or -pgrp where SIGIO should be sent */ |
| 871 | enum pid_type pid_type; /* Kind of process group SIGIO should be sent to */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 872 | uid_t uid, euid; /* uid/euid of process setting the owner */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 873 | int signum; /* posix.1b rt signal to be delivered on IO */ |
| 874 | }; |
| 875 | |
| 876 | /* |
| 877 | * Track a single file's readahead state |
| 878 | */ |
| 879 | struct file_ra_state { |
Fengguang Wu | 937085a | 2007-10-16 01:24:31 -0700 | [diff] [blame] | 880 | pgoff_t start; /* where readahead started */ |
| 881 | unsigned int size; /* # of readahead pages */ |
| 882 | unsigned int async_size; /* do asynchronous readahead when |
Fengguang Wu | f9acc8c | 2007-07-19 01:48:08 -0700 | [diff] [blame] | 883 | there are only # of pages ahead */ |
Fengguang Wu | 5ce1110 | 2007-07-19 01:47:59 -0700 | [diff] [blame] | 884 | |
Fengguang Wu | 937085a | 2007-10-16 01:24:31 -0700 | [diff] [blame] | 885 | unsigned int ra_pages; /* Maximum readahead window */ |
Fengguang Wu | 0bb7ba6 | 2007-10-16 01:24:32 -0700 | [diff] [blame] | 886 | int mmap_miss; /* Cache miss stat for mmap accesses */ |
Fengguang Wu | f4e6b49 | 2007-10-16 01:24:33 -0700 | [diff] [blame] | 887 | loff_t prev_pos; /* Cache last read() position */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 888 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 889 | |
Fengguang Wu | 5ce1110 | 2007-07-19 01:47:59 -0700 | [diff] [blame] | 890 | /* |
Fengguang Wu | 5ce1110 | 2007-07-19 01:47:59 -0700 | [diff] [blame] | 891 | * Check if @index falls in the readahead windows. |
| 892 | */ |
| 893 | static inline int ra_has_index(struct file_ra_state *ra, pgoff_t index) |
| 894 | { |
Fengguang Wu | f9acc8c | 2007-07-19 01:48:08 -0700 | [diff] [blame] | 895 | return (index >= ra->start && |
| 896 | index < ra->start + ra->size); |
Fengguang Wu | 5ce1110 | 2007-07-19 01:47:59 -0700 | [diff] [blame] | 897 | } |
| 898 | |
Dave Hansen | ad775f5 | 2008-02-15 14:38:01 -0800 | [diff] [blame] | 899 | #define FILE_MNT_WRITE_TAKEN 1 |
| 900 | #define FILE_MNT_WRITE_RELEASED 2 |
| 901 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 902 | struct file { |
Eric Dumazet | 2f51201 | 2005-10-30 15:02:16 -0800 | [diff] [blame] | 903 | /* |
| 904 | * fu_list becomes invalid after file_free is called and queued via |
| 905 | * fu_rcuhead for RCU freeing |
| 906 | */ |
| 907 | union { |
| 908 | struct list_head fu_list; |
| 909 | struct rcu_head fu_rcuhead; |
| 910 | } f_u; |
Josef "Jeff" Sipek | 0f7fc9e | 2006-12-08 02:36:35 -0800 | [diff] [blame] | 911 | struct path f_path; |
| 912 | #define f_dentry f_path.dentry |
| 913 | #define f_vfsmnt f_path.mnt |
Arjan van de Ven | 99ac48f | 2006-03-28 01:56:41 -0800 | [diff] [blame] | 914 | const struct file_operations *f_op; |
Jonathan Corbet | 4a6a449 | 2009-03-27 12:24:31 -0600 | [diff] [blame] | 915 | spinlock_t f_lock; /* f_ep_links, f_flags, no IRQ */ |
Al Viro | 516e0cc | 2008-07-26 00:39:17 -0400 | [diff] [blame] | 916 | atomic_long_t f_count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 917 | unsigned int f_flags; |
Al Viro | aeb5d72 | 2008-09-02 15:28:45 -0400 | [diff] [blame] | 918 | fmode_t f_mode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 919 | loff_t f_pos; |
| 920 | struct fown_struct f_owner; |
David Howells | d76b0d9 | 2008-11-14 10:39:25 +1100 | [diff] [blame] | 921 | const struct cred *f_cred; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 922 | struct file_ra_state f_ra; |
| 923 | |
Mathieu Desnoyers | 2b47c36 | 2007-10-16 23:27:21 -0700 | [diff] [blame] | 924 | u64 f_version; |
Alexey Dobriyan | 5046206 | 2006-09-29 02:00:01 -0700 | [diff] [blame] | 925 | #ifdef CONFIG_SECURITY |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 926 | void *f_security; |
Alexey Dobriyan | 5046206 | 2006-09-29 02:00:01 -0700 | [diff] [blame] | 927 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 928 | /* needed for tty driver, and maybe others */ |
| 929 | void *private_data; |
| 930 | |
| 931 | #ifdef CONFIG_EPOLL |
| 932 | /* Used by fs/eventpoll.c to link all the hooks to this file */ |
| 933 | struct list_head f_ep_links; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 934 | #endif /* #ifdef CONFIG_EPOLL */ |
| 935 | struct address_space *f_mapping; |
Dave Hansen | ad775f5 | 2008-02-15 14:38:01 -0800 | [diff] [blame] | 936 | #ifdef CONFIG_DEBUG_WRITECOUNT |
| 937 | unsigned long f_mnt_write_state; |
| 938 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 939 | }; |
| 940 | extern spinlock_t files_lock; |
| 941 | #define file_list_lock() spin_lock(&files_lock); |
| 942 | #define file_list_unlock() spin_unlock(&files_lock); |
| 943 | |
Al Viro | 516e0cc | 2008-07-26 00:39:17 -0400 | [diff] [blame] | 944 | #define get_file(x) atomic_long_inc(&(x)->f_count) |
| 945 | #define file_count(x) atomic_long_read(&(x)->f_count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 946 | |
Dave Hansen | ad775f5 | 2008-02-15 14:38:01 -0800 | [diff] [blame] | 947 | #ifdef CONFIG_DEBUG_WRITECOUNT |
| 948 | static inline void file_take_write(struct file *f) |
| 949 | { |
| 950 | WARN_ON(f->f_mnt_write_state != 0); |
| 951 | f->f_mnt_write_state = FILE_MNT_WRITE_TAKEN; |
| 952 | } |
| 953 | static inline void file_release_write(struct file *f) |
| 954 | { |
| 955 | f->f_mnt_write_state |= FILE_MNT_WRITE_RELEASED; |
| 956 | } |
| 957 | static inline void file_reset_write(struct file *f) |
| 958 | { |
| 959 | f->f_mnt_write_state = 0; |
| 960 | } |
| 961 | static inline void file_check_state(struct file *f) |
| 962 | { |
| 963 | /* |
| 964 | * At this point, either both or neither of these bits |
| 965 | * should be set. |
| 966 | */ |
| 967 | WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN); |
| 968 | WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_RELEASED); |
| 969 | } |
| 970 | static inline int file_check_writeable(struct file *f) |
| 971 | { |
| 972 | if (f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN) |
| 973 | return 0; |
| 974 | printk(KERN_WARNING "writeable file with no " |
| 975 | "mnt_want_write()\n"); |
| 976 | WARN_ON(1); |
| 977 | return -EINVAL; |
| 978 | } |
| 979 | #else /* !CONFIG_DEBUG_WRITECOUNT */ |
| 980 | static inline void file_take_write(struct file *filp) {} |
| 981 | static inline void file_release_write(struct file *filp) {} |
| 982 | static inline void file_reset_write(struct file *filp) {} |
| 983 | static inline void file_check_state(struct file *filp) {} |
| 984 | static inline int file_check_writeable(struct file *filp) |
| 985 | { |
| 986 | return 0; |
| 987 | } |
| 988 | #endif /* CONFIG_DEBUG_WRITECOUNT */ |
| 989 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 990 | #define MAX_NON_LFS ((1UL<<31) - 1) |
| 991 | |
| 992 | /* Page cache limit. The filesystems should put that into their s_maxbytes |
| 993 | limits, otherwise bad things can happen in VM. */ |
| 994 | #if BITS_PER_LONG==32 |
| 995 | #define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1) |
| 996 | #elif BITS_PER_LONG==64 |
| 997 | #define MAX_LFS_FILESIZE 0x7fffffffffffffffUL |
| 998 | #endif |
| 999 | |
| 1000 | #define FL_POSIX 1 |
| 1001 | #define FL_FLOCK 2 |
| 1002 | #define FL_ACCESS 8 /* not trying to lock, just looking */ |
Trond Myklebust | f475ae9 | 2006-06-29 16:38:32 -0400 | [diff] [blame] | 1003 | #define FL_EXISTS 16 /* when unlocking, test for existence */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1004 | #define FL_LEASE 32 /* lease held on this file */ |
Miklos Szeredi | 75e1fcc | 2006-06-23 02:05:12 -0700 | [diff] [blame] | 1005 | #define FL_CLOSE 64 /* unlock on close */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1006 | #define FL_SLEEP 128 /* A blocking lock */ |
| 1007 | |
| 1008 | /* |
Miklos Szeredi | bde74e4 | 2008-07-25 01:48:57 -0700 | [diff] [blame] | 1009 | * Special return value from posix_lock_file() and vfs_lock_file() for |
| 1010 | * asynchronous locking. |
| 1011 | */ |
| 1012 | #define FILE_LOCK_DEFERRED 1 |
| 1013 | |
| 1014 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1015 | * The POSIX file lock owner is determined by |
| 1016 | * the "struct files_struct" in the thread group |
| 1017 | * (or NULL for no owner - BSD locks). |
| 1018 | * |
| 1019 | * Lockd stuffs a "host" pointer into this. |
| 1020 | */ |
| 1021 | typedef struct files_struct *fl_owner_t; |
| 1022 | |
| 1023 | struct file_lock_operations { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1024 | void (*fl_copy_lock)(struct file_lock *, struct file_lock *); |
| 1025 | void (*fl_release_private)(struct file_lock *); |
| 1026 | }; |
| 1027 | |
| 1028 | struct lock_manager_operations { |
| 1029 | int (*fl_compare_owner)(struct file_lock *, struct file_lock *); |
| 1030 | void (*fl_notify)(struct file_lock *); /* unblock callback */ |
Marc Eshel | 2beb661 | 2006-12-05 23:31:28 -0500 | [diff] [blame] | 1031 | int (*fl_grant)(struct file_lock *, struct file_lock *, int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1032 | void (*fl_copy_lock)(struct file_lock *, struct file_lock *); |
| 1033 | void (*fl_release_private)(struct file_lock *); |
| 1034 | void (*fl_break)(struct file_lock *); |
| 1035 | int (*fl_mylease)(struct file_lock *, struct file_lock *); |
| 1036 | int (*fl_change)(struct file_lock **, int); |
| 1037 | }; |
| 1038 | |
J. Bruce Fields | af558e3 | 2007-09-06 12:34:25 -0400 | [diff] [blame] | 1039 | struct lock_manager { |
| 1040 | struct list_head list; |
| 1041 | }; |
| 1042 | |
| 1043 | void locks_start_grace(struct lock_manager *); |
| 1044 | void locks_end_grace(struct lock_manager *); |
| 1045 | int locks_in_grace(void); |
| 1046 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1047 | /* that will die - we need it for nfs_lock_info */ |
| 1048 | #include <linux/nfs_fs_i.h> |
| 1049 | |
| 1050 | struct file_lock { |
| 1051 | struct file_lock *fl_next; /* singly linked list for this inode */ |
| 1052 | struct list_head fl_link; /* doubly linked list of all locks */ |
| 1053 | struct list_head fl_block; /* circular list of blocked processes */ |
| 1054 | fl_owner_t fl_owner; |
Richard Kennedy | afc1246 | 2008-07-11 17:20:49 -0700 | [diff] [blame] | 1055 | unsigned char fl_flags; |
| 1056 | unsigned char fl_type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1057 | unsigned int fl_pid; |
Vitaliy Gusev | ab1f161 | 2008-01-17 00:07:08 +0000 | [diff] [blame] | 1058 | struct pid *fl_nspid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1059 | wait_queue_head_t fl_wait; |
| 1060 | struct file *fl_file; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1061 | loff_t fl_start; |
| 1062 | loff_t fl_end; |
| 1063 | |
| 1064 | struct fasync_struct * fl_fasync; /* for lease break notifications */ |
| 1065 | unsigned long fl_break_time; /* for nonblocking lease breaks */ |
| 1066 | |
| 1067 | struct file_lock_operations *fl_ops; /* Callbacks for filesystems */ |
| 1068 | struct lock_manager_operations *fl_lmops; /* Callbacks for lockmanagers */ |
| 1069 | union { |
| 1070 | struct nfs_lock_info nfs_fl; |
Trond Myklebust | 8d0a8a9 | 2005-06-22 17:16:32 +0000 | [diff] [blame] | 1071 | struct nfs4_lock_info nfs4_fl; |
David Howells | e8d6c55 | 2007-07-15 23:40:12 -0700 | [diff] [blame] | 1072 | struct { |
| 1073 | struct list_head link; /* link in AFS vnode's pending_locks list */ |
| 1074 | int state; /* state of grant or error if -ve */ |
| 1075 | } afs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1076 | } fl_u; |
| 1077 | }; |
| 1078 | |
| 1079 | /* The following constant reflects the upper bound of the file/locking space */ |
| 1080 | #ifndef OFFSET_MAX |
| 1081 | #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1))) |
| 1082 | #define OFFSET_MAX INT_LIMIT(loff_t) |
| 1083 | #define OFFT_OFFSET_MAX INT_LIMIT(off_t) |
| 1084 | #endif |
| 1085 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1086 | #include <linux/fcntl.h> |
| 1087 | |
Thomas Petazzoni | bfcd17a | 2008-08-06 15:12:22 +0200 | [diff] [blame] | 1088 | extern void send_sigio(struct fown_struct *fown, int fd, int band); |
| 1089 | |
| 1090 | /* fs/sync.c */ |
| 1091 | extern int do_sync_mapping_range(struct address_space *mapping, loff_t offset, |
| 1092 | loff_t endbyte, unsigned int flags); |
| 1093 | |
| 1094 | #ifdef CONFIG_FILE_LOCKING |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1095 | extern int fcntl_getlk(struct file *, struct flock __user *); |
Peter Staubach | c293621 | 2005-07-27 11:45:09 -0700 | [diff] [blame] | 1096 | extern int fcntl_setlk(unsigned int, struct file *, unsigned int, |
| 1097 | struct flock __user *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1098 | |
| 1099 | #if BITS_PER_LONG == 32 |
| 1100 | extern int fcntl_getlk64(struct file *, struct flock64 __user *); |
Peter Staubach | c293621 | 2005-07-27 11:45:09 -0700 | [diff] [blame] | 1101 | extern int fcntl_setlk64(unsigned int, struct file *, unsigned int, |
| 1102 | struct flock64 __user *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1103 | #endif |
| 1104 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1105 | extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg); |
| 1106 | extern int fcntl_getlease(struct file *filp); |
| 1107 | |
| 1108 | /* fs/locks.c */ |
| 1109 | extern void locks_init_lock(struct file_lock *); |
| 1110 | extern void locks_copy_lock(struct file_lock *, struct file_lock *); |
J. Bruce Fields | 1a747ee | 2008-04-24 10:08:22 -0400 | [diff] [blame] | 1111 | extern void __locks_copy_lock(struct file_lock *, const struct file_lock *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1112 | extern void locks_remove_posix(struct file *, fl_owner_t); |
| 1113 | extern void locks_remove_flock(struct file *); |
J. Bruce Fields | 6d34ac1 | 2007-05-11 16:09:32 -0400 | [diff] [blame] | 1114 | extern void posix_test_lock(struct file *, struct file_lock *); |
Marc Eshel | 150b393 | 2007-01-18 16:15:35 -0500 | [diff] [blame] | 1115 | extern int posix_lock_file(struct file *, struct file_lock *, struct file_lock *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1116 | extern int posix_lock_file_wait(struct file *, struct file_lock *); |
J. Bruce Fields | 64a318e | 2006-01-03 09:55:46 +0100 | [diff] [blame] | 1117 | extern int posix_unblock_lock(struct file *, struct file_lock *); |
J. Bruce Fields | 3ee17ab | 2007-02-21 00:58:50 -0500 | [diff] [blame] | 1118 | extern int vfs_test_lock(struct file *, struct file_lock *); |
Marc Eshel | 150b393 | 2007-01-18 16:15:35 -0500 | [diff] [blame] | 1119 | extern int vfs_lock_file(struct file *, unsigned int, struct file_lock *, struct file_lock *); |
Marc Eshel | 9b9d2ab | 2007-01-18 17:52:58 -0500 | [diff] [blame] | 1120 | extern int vfs_cancel_lock(struct file *filp, struct file_lock *fl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1121 | extern int flock_lock_file_wait(struct file *filp, struct file_lock *fl); |
| 1122 | extern int __break_lease(struct inode *inode, unsigned int flags); |
| 1123 | extern void lease_get_mtime(struct inode *, struct timespec *time); |
Christoph Hellwig | 0af1a45 | 2007-07-31 00:39:22 -0700 | [diff] [blame] | 1124 | extern int generic_setlease(struct file *, long, struct file_lock **); |
J. Bruce Fields | a9933ce | 2007-06-07 17:09:49 -0400 | [diff] [blame] | 1125 | extern int vfs_setlease(struct file *, long, struct file_lock **); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1126 | extern int lease_modify(struct file_lock **, int); |
| 1127 | extern int lock_may_read(struct inode *, loff_t start, unsigned long count); |
| 1128 | extern int lock_may_write(struct inode *, loff_t start, unsigned long count); |
Thomas Petazzoni | bfcd17a | 2008-08-06 15:12:22 +0200 | [diff] [blame] | 1129 | #else /* !CONFIG_FILE_LOCKING */ |
Steven Whitehouse | c2aca5e | 2009-01-20 10:29:45 +0000 | [diff] [blame] | 1130 | static inline int fcntl_getlk(struct file *file, struct flock __user *user) |
| 1131 | { |
| 1132 | return -EINVAL; |
| 1133 | } |
| 1134 | |
| 1135 | static inline int fcntl_setlk(unsigned int fd, struct file *file, |
| 1136 | unsigned int cmd, struct flock __user *user) |
| 1137 | { |
| 1138 | return -EACCES; |
| 1139 | } |
| 1140 | |
Thomas Petazzoni | bfcd17a | 2008-08-06 15:12:22 +0200 | [diff] [blame] | 1141 | #if BITS_PER_LONG == 32 |
Steven Whitehouse | c2aca5e | 2009-01-20 10:29:45 +0000 | [diff] [blame] | 1142 | static inline int fcntl_getlk64(struct file *file, struct flock64 __user *user) |
| 1143 | { |
| 1144 | return -EINVAL; |
| 1145 | } |
| 1146 | |
| 1147 | static inline int fcntl_setlk64(unsigned int fd, struct file *file, |
| 1148 | unsigned int cmd, struct flock64 __user *user) |
| 1149 | { |
| 1150 | return -EACCES; |
| 1151 | } |
Thomas Petazzoni | bfcd17a | 2008-08-06 15:12:22 +0200 | [diff] [blame] | 1152 | #endif |
Steven Whitehouse | c2aca5e | 2009-01-20 10:29:45 +0000 | [diff] [blame] | 1153 | static inline int fcntl_setlease(unsigned int fd, struct file *filp, long arg) |
| 1154 | { |
| 1155 | return 0; |
| 1156 | } |
| 1157 | |
| 1158 | static inline int fcntl_getlease(struct file *filp) |
| 1159 | { |
| 1160 | return 0; |
| 1161 | } |
| 1162 | |
| 1163 | static inline void locks_init_lock(struct file_lock *fl) |
| 1164 | { |
| 1165 | return; |
| 1166 | } |
| 1167 | |
| 1168 | static inline void __locks_copy_lock(struct file_lock *new, struct file_lock *fl) |
| 1169 | { |
| 1170 | return; |
| 1171 | } |
| 1172 | |
| 1173 | static inline void locks_copy_lock(struct file_lock *new, struct file_lock *fl) |
| 1174 | { |
| 1175 | return; |
| 1176 | } |
| 1177 | |
| 1178 | static inline void locks_remove_posix(struct file *filp, fl_owner_t owner) |
| 1179 | { |
| 1180 | return; |
| 1181 | } |
| 1182 | |
| 1183 | static inline void locks_remove_flock(struct file *filp) |
| 1184 | { |
| 1185 | return; |
| 1186 | } |
| 1187 | |
| 1188 | static inline void posix_test_lock(struct file *filp, struct file_lock *fl) |
| 1189 | { |
| 1190 | return; |
| 1191 | } |
| 1192 | |
| 1193 | static inline int posix_lock_file(struct file *filp, struct file_lock *fl, |
| 1194 | struct file_lock *conflock) |
| 1195 | { |
| 1196 | return -ENOLCK; |
| 1197 | } |
| 1198 | |
| 1199 | static inline int posix_lock_file_wait(struct file *filp, struct file_lock *fl) |
| 1200 | { |
| 1201 | return -ENOLCK; |
| 1202 | } |
| 1203 | |
| 1204 | static inline int posix_unblock_lock(struct file *filp, |
| 1205 | struct file_lock *waiter) |
| 1206 | { |
| 1207 | return -ENOENT; |
| 1208 | } |
| 1209 | |
| 1210 | static inline int vfs_test_lock(struct file *filp, struct file_lock *fl) |
| 1211 | { |
| 1212 | return 0; |
| 1213 | } |
| 1214 | |
| 1215 | static inline int vfs_lock_file(struct file *filp, unsigned int cmd, |
| 1216 | struct file_lock *fl, struct file_lock *conf) |
| 1217 | { |
| 1218 | return -ENOLCK; |
| 1219 | } |
| 1220 | |
| 1221 | static inline int vfs_cancel_lock(struct file *filp, struct file_lock *fl) |
| 1222 | { |
| 1223 | return 0; |
| 1224 | } |
| 1225 | |
| 1226 | static inline int flock_lock_file_wait(struct file *filp, |
| 1227 | struct file_lock *request) |
| 1228 | { |
| 1229 | return -ENOLCK; |
| 1230 | } |
| 1231 | |
| 1232 | static inline int __break_lease(struct inode *inode, unsigned int mode) |
| 1233 | { |
| 1234 | return 0; |
| 1235 | } |
| 1236 | |
| 1237 | static inline void lease_get_mtime(struct inode *inode, struct timespec *time) |
| 1238 | { |
| 1239 | return; |
| 1240 | } |
| 1241 | |
| 1242 | static inline int generic_setlease(struct file *filp, long arg, |
| 1243 | struct file_lock **flp) |
| 1244 | { |
| 1245 | return -EINVAL; |
| 1246 | } |
| 1247 | |
| 1248 | static inline int vfs_setlease(struct file *filp, long arg, |
| 1249 | struct file_lock **lease) |
| 1250 | { |
| 1251 | return -EINVAL; |
| 1252 | } |
| 1253 | |
| 1254 | static inline int lease_modify(struct file_lock **before, int arg) |
| 1255 | { |
| 1256 | return -EINVAL; |
| 1257 | } |
| 1258 | |
| 1259 | static inline int lock_may_read(struct inode *inode, loff_t start, |
| 1260 | unsigned long len) |
| 1261 | { |
| 1262 | return 1; |
| 1263 | } |
| 1264 | |
| 1265 | static inline int lock_may_write(struct inode *inode, loff_t start, |
| 1266 | unsigned long len) |
| 1267 | { |
| 1268 | return 1; |
| 1269 | } |
| 1270 | |
Thomas Petazzoni | bfcd17a | 2008-08-06 15:12:22 +0200 | [diff] [blame] | 1271 | #endif /* !CONFIG_FILE_LOCKING */ |
| 1272 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1273 | |
| 1274 | struct fasync_struct { |
| 1275 | int magic; |
| 1276 | int fa_fd; |
| 1277 | struct fasync_struct *fa_next; /* singly linked list */ |
| 1278 | struct file *fa_file; |
| 1279 | }; |
| 1280 | |
| 1281 | #define FASYNC_MAGIC 0x4601 |
| 1282 | |
| 1283 | /* SMP safe fasync helpers: */ |
| 1284 | extern int fasync_helper(int, struct file *, int, struct fasync_struct **); |
| 1285 | /* can be called from interrupts */ |
| 1286 | extern void kill_fasync(struct fasync_struct **, int, int); |
| 1287 | /* only for net: no internal synchronization */ |
| 1288 | extern void __kill_fasync(struct fasync_struct *, int, int); |
| 1289 | |
Eric W. Biederman | 609d7fa | 2006-10-02 02:17:15 -0700 | [diff] [blame] | 1290 | extern int __f_setown(struct file *filp, struct pid *, enum pid_type, int force); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1291 | extern int f_setown(struct file *filp, unsigned long arg, int force); |
| 1292 | extern void f_delown(struct file *filp); |
Eric W. Biederman | 609d7fa | 2006-10-02 02:17:15 -0700 | [diff] [blame] | 1293 | extern pid_t f_getown(struct file *filp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1294 | extern int send_sigurg(struct fown_struct *fown); |
| 1295 | |
| 1296 | /* |
| 1297 | * Umount options |
| 1298 | */ |
| 1299 | |
| 1300 | #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */ |
| 1301 | #define MNT_DETACH 0x00000002 /* Just detach from the tree */ |
| 1302 | #define MNT_EXPIRE 0x00000004 /* Mark for expiry */ |
| 1303 | |
| 1304 | extern struct list_head super_blocks; |
| 1305 | extern spinlock_t sb_lock; |
| 1306 | |
Kentaro Makita | da3bbdd | 2008-07-23 21:27:13 -0700 | [diff] [blame] | 1307 | #define sb_entry(list) list_entry((list), struct super_block, s_list) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1308 | #define S_BIAS (1<<30) |
| 1309 | struct super_block { |
| 1310 | struct list_head s_list; /* Keep this first */ |
| 1311 | dev_t s_dev; /* search index; _not_ kdev_t */ |
| 1312 | unsigned long s_blocksize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1313 | unsigned char s_blocksize_bits; |
| 1314 | unsigned char s_dirt; |
| 1315 | unsigned long long s_maxbytes; /* Max file size */ |
| 1316 | struct file_system_type *s_type; |
Josef 'Jeff' Sipek | ee9b6d6 | 2007-02-12 00:55:41 -0800 | [diff] [blame] | 1317 | const struct super_operations *s_op; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1318 | struct dquot_operations *dq_op; |
| 1319 | struct quotactl_ops *s_qcop; |
Christoph Hellwig | 3965516 | 2007-10-21 16:42:17 -0700 | [diff] [blame] | 1320 | const struct export_operations *s_export_op; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1321 | unsigned long s_flags; |
| 1322 | unsigned long s_magic; |
| 1323 | struct dentry *s_root; |
| 1324 | struct rw_semaphore s_umount; |
Ingo Molnar | 7892f2f | 2006-01-09 15:59:25 -0800 | [diff] [blame] | 1325 | struct mutex s_lock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1326 | int s_count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1327 | int s_need_sync_fs; |
| 1328 | atomic_t s_active; |
Alexey Dobriyan | 5046206 | 2006-09-29 02:00:01 -0700 | [diff] [blame] | 1329 | #ifdef CONFIG_SECURITY |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1330 | void *s_security; |
Alexey Dobriyan | 5046206 | 2006-09-29 02:00:01 -0700 | [diff] [blame] | 1331 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1332 | struct xattr_handler **s_xattr; |
| 1333 | |
| 1334 | struct list_head s_inodes; /* all inodes */ |
| 1335 | struct list_head s_dirty; /* dirty inodes */ |
| 1336 | struct list_head s_io; /* parked for writeback */ |
Ken Chen | 0e0f4fc | 2007-10-16 23:30:38 -0700 | [diff] [blame] | 1337 | struct list_head s_more_io; /* parked for more writeback */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1338 | struct hlist_head s_anon; /* anonymous dentries for (nfs) exporting */ |
| 1339 | struct list_head s_files; |
Kentaro Makita | da3bbdd | 2008-07-23 21:27:13 -0700 | [diff] [blame] | 1340 | /* s_dentry_lru and s_nr_dentry_unused are protected by dcache_lock */ |
| 1341 | struct list_head s_dentry_lru; /* unused dentry lru */ |
| 1342 | int s_nr_dentry_unused; /* # of dentry on lru */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1343 | |
| 1344 | struct block_device *s_bdev; |
David Howells | acaebfd | 2007-05-10 22:51:50 -0700 | [diff] [blame] | 1345 | struct mtd_info *s_mtd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1346 | struct list_head s_instances; |
| 1347 | struct quota_info s_dquot; /* Diskquota specific options */ |
| 1348 | |
| 1349 | int s_frozen; |
| 1350 | wait_queue_head_t s_wait_unfrozen; |
| 1351 | |
| 1352 | char s_id[32]; /* Informational name */ |
| 1353 | |
| 1354 | void *s_fs_info; /* Filesystem private info */ |
Al Viro | 30c40d2 | 2008-02-22 19:50:45 -0500 | [diff] [blame] | 1355 | fmode_t s_mode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1356 | |
| 1357 | /* |
| 1358 | * The next field is for VFS *only*. No filesystems have any business |
| 1359 | * even looking at it. You had been warned. |
| 1360 | */ |
Arjan van de Ven | a11f3a0 | 2006-03-23 03:00:33 -0800 | [diff] [blame] | 1361 | struct mutex s_vfs_rename_mutex; /* Kludge */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1362 | |
Kalin KOZHUHAROV | 8ba8e95 | 2006-04-01 01:41:22 +0200 | [diff] [blame] | 1363 | /* Granularity of c/m/atime in ns. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1364 | Cannot be worse than a second */ |
| 1365 | u32 s_time_gran; |
Miklos Szeredi | 79c0b2d | 2007-05-08 00:25:43 -0700 | [diff] [blame] | 1366 | |
| 1367 | /* |
| 1368 | * Filesystem subtype. If non-empty the filesystem type field |
| 1369 | * in /proc/mounts will be "type.subtype" |
| 1370 | */ |
| 1371 | char *s_subtype; |
Miklos Szeredi | b3b304a | 2008-02-08 04:21:35 -0800 | [diff] [blame] | 1372 | |
| 1373 | /* |
| 1374 | * Saved mount options for lazy filesystems using |
| 1375 | * generic_show_options() |
| 1376 | */ |
| 1377 | char *s_options; |
Arjan van de Ven | efaee19 | 2009-01-06 07:20:54 -0800 | [diff] [blame] | 1378 | |
| 1379 | /* |
| 1380 | * storage for asynchronous operations |
| 1381 | */ |
| 1382 | struct list_head s_async_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1383 | }; |
| 1384 | |
| 1385 | extern struct timespec current_fs_time(struct super_block *sb); |
| 1386 | |
| 1387 | /* |
| 1388 | * Snapshotting support. |
| 1389 | */ |
| 1390 | enum { |
| 1391 | SB_UNFROZEN = 0, |
| 1392 | SB_FREEZE_WRITE = 1, |
| 1393 | SB_FREEZE_TRANS = 2, |
| 1394 | }; |
| 1395 | |
| 1396 | #define vfs_check_frozen(sb, level) \ |
| 1397 | wait_event((sb)->s_wait_unfrozen, ((sb)->s_frozen < (level))) |
| 1398 | |
Al Viro | 914e263 | 2006-10-18 13:55:46 -0400 | [diff] [blame] | 1399 | #define get_fs_excl() atomic_inc(¤t->fs_excl) |
| 1400 | #define put_fs_excl() atomic_dec(¤t->fs_excl) |
| 1401 | #define has_fs_excl() atomic_read(¤t->fs_excl) |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 1402 | |
Satyam Sharma | 3bd858a | 2007-07-17 15:00:08 +0530 | [diff] [blame] | 1403 | #define is_owner_or_cap(inode) \ |
David Howells | da9592e | 2008-11-14 10:39:05 +1100 | [diff] [blame] | 1404 | ((current_fsuid() == (inode)->i_uid) || capable(CAP_FOWNER)) |
Satyam Sharma | 3bd858a | 2007-07-17 15:00:08 +0530 | [diff] [blame] | 1405 | |
Al Viro | 914e263 | 2006-10-18 13:55:46 -0400 | [diff] [blame] | 1406 | /* not quite ready to be deprecated, but... */ |
| 1407 | extern void lock_super(struct super_block *); |
| 1408 | extern void unlock_super(struct super_block *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1409 | |
| 1410 | /* |
| 1411 | * VFS helper functions.. |
| 1412 | */ |
| 1413 | extern int vfs_create(struct inode *, struct dentry *, int, struct nameidata *); |
| 1414 | extern int vfs_mkdir(struct inode *, struct dentry *, int); |
| 1415 | extern int vfs_mknod(struct inode *, struct dentry *, int, dev_t); |
Miklos Szeredi | db2e747 | 2008-06-24 16:50:16 +0200 | [diff] [blame] | 1416 | extern int vfs_symlink(struct inode *, struct dentry *, const char *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1417 | extern int vfs_link(struct dentry *, struct inode *, struct dentry *); |
| 1418 | extern int vfs_rmdir(struct inode *, struct dentry *); |
| 1419 | extern int vfs_unlink(struct inode *, struct dentry *); |
| 1420 | extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *); |
| 1421 | |
| 1422 | /* |
| 1423 | * VFS dentry helper functions. |
| 1424 | */ |
| 1425 | extern void dentry_unhash(struct dentry *dentry); |
| 1426 | |
| 1427 | /* |
Christoph Hellwig | 8c744fb | 2005-11-08 21:35:04 -0800 | [diff] [blame] | 1428 | * VFS file helper functions. |
| 1429 | */ |
| 1430 | extern int file_permission(struct file *, int); |
| 1431 | |
| 1432 | /* |
Mark Fasheh | c4b929b | 2008-10-08 19:44:18 -0400 | [diff] [blame] | 1433 | * VFS FS_IOC_FIEMAP helper definitions. |
| 1434 | */ |
| 1435 | struct fiemap_extent_info { |
| 1436 | unsigned int fi_flags; /* Flags as passed from user */ |
| 1437 | unsigned int fi_extents_mapped; /* Number of mapped extents */ |
| 1438 | unsigned int fi_extents_max; /* Size of fiemap_extent array */ |
| 1439 | struct fiemap_extent *fi_extents_start; /* Start of fiemap_extent |
| 1440 | * array */ |
| 1441 | }; |
| 1442 | int fiemap_fill_next_extent(struct fiemap_extent_info *info, u64 logical, |
| 1443 | u64 phys, u64 len, u32 flags); |
| 1444 | int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags); |
| 1445 | |
| 1446 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1447 | * File types |
| 1448 | * |
| 1449 | * NOTE! These match bits 12..15 of stat.st_mode |
| 1450 | * (ie "(i_mode >> 12) & 15"). |
| 1451 | */ |
| 1452 | #define DT_UNKNOWN 0 |
| 1453 | #define DT_FIFO 1 |
| 1454 | #define DT_CHR 2 |
| 1455 | #define DT_DIR 4 |
| 1456 | #define DT_BLK 6 |
| 1457 | #define DT_REG 8 |
| 1458 | #define DT_LNK 10 |
| 1459 | #define DT_SOCK 12 |
| 1460 | #define DT_WHT 14 |
| 1461 | |
| 1462 | #define OSYNC_METADATA (1<<0) |
| 1463 | #define OSYNC_DATA (1<<1) |
| 1464 | #define OSYNC_INODE (1<<2) |
| 1465 | int generic_osync_inode(struct inode *, struct address_space *, int); |
| 1466 | |
| 1467 | /* |
| 1468 | * This is the "filldir" function type, used by readdir() to let |
| 1469 | * the kernel specify what kind of dirent layout it wants to have. |
| 1470 | * This allows the kernel to read directories into kernel space or |
| 1471 | * to have different dirent layouts depending on the binary type. |
| 1472 | */ |
David Howells | afefdbb | 2006-10-03 01:13:46 -0700 | [diff] [blame] | 1473 | typedef int (*filldir_t)(void *, const char *, int, loff_t, u64, unsigned); |
Al Viro | 08f8585 | 2007-10-08 13:26:20 -0400 | [diff] [blame] | 1474 | struct block_device_operations; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1475 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1476 | /* These macros are for out of kernel modules to test that |
| 1477 | * the kernel supports the unlocked_ioctl and compat_ioctl |
| 1478 | * fields in struct file_operations. */ |
| 1479 | #define HAVE_COMPAT_IOCTL 1 |
| 1480 | #define HAVE_UNLOCKED_IOCTL 1 |
| 1481 | |
| 1482 | /* |
| 1483 | * NOTE: |
| 1484 | * read, write, poll, fsync, readv, writev, unlocked_ioctl and compat_ioctl |
| 1485 | * can be called without the big kernel lock held in all filesystems. |
| 1486 | */ |
| 1487 | struct file_operations { |
| 1488 | struct module *owner; |
| 1489 | loff_t (*llseek) (struct file *, loff_t, int); |
| 1490 | ssize_t (*read) (struct file *, char __user *, size_t, loff_t *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1491 | ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *); |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 1492 | ssize_t (*aio_read) (struct kiocb *, const struct iovec *, unsigned long, loff_t); |
| 1493 | ssize_t (*aio_write) (struct kiocb *, const struct iovec *, unsigned long, loff_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1494 | int (*readdir) (struct file *, void *, filldir_t); |
| 1495 | unsigned int (*poll) (struct file *, struct poll_table_struct *); |
| 1496 | int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long); |
| 1497 | long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long); |
| 1498 | long (*compat_ioctl) (struct file *, unsigned int, unsigned long); |
| 1499 | int (*mmap) (struct file *, struct vm_area_struct *); |
| 1500 | int (*open) (struct inode *, struct file *); |
Miklos Szeredi | 75e1fcc | 2006-06-23 02:05:12 -0700 | [diff] [blame] | 1501 | int (*flush) (struct file *, fl_owner_t id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1502 | int (*release) (struct inode *, struct file *); |
| 1503 | int (*fsync) (struct file *, struct dentry *, int datasync); |
| 1504 | int (*aio_fsync) (struct kiocb *, int datasync); |
| 1505 | int (*fasync) (int, struct file *, int); |
| 1506 | int (*lock) (struct file *, int, struct file_lock *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1507 | ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int); |
| 1508 | unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); |
| 1509 | int (*check_flags)(int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1510 | int (*flock) (struct file *, int, struct file_lock *); |
Jens Axboe | cbb7e57 | 2006-04-11 14:57:50 +0200 | [diff] [blame] | 1511 | ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int); |
| 1512 | ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int); |
J. Bruce Fields | f9ffed2 | 2006-11-14 15:51:40 -0500 | [diff] [blame] | 1513 | int (*setlease)(struct file *, long, struct file_lock **); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1514 | }; |
| 1515 | |
| 1516 | struct inode_operations { |
| 1517 | int (*create) (struct inode *,struct dentry *,int, struct nameidata *); |
| 1518 | struct dentry * (*lookup) (struct inode *,struct dentry *, struct nameidata *); |
| 1519 | int (*link) (struct dentry *,struct inode *,struct dentry *); |
| 1520 | int (*unlink) (struct inode *,struct dentry *); |
| 1521 | int (*symlink) (struct inode *,struct dentry *,const char *); |
| 1522 | int (*mkdir) (struct inode *,struct dentry *,int); |
| 1523 | int (*rmdir) (struct inode *,struct dentry *); |
| 1524 | int (*mknod) (struct inode *,struct dentry *,int,dev_t); |
| 1525 | int (*rename) (struct inode *, struct dentry *, |
| 1526 | struct inode *, struct dentry *); |
| 1527 | int (*readlink) (struct dentry *, char __user *,int); |
Linus Torvalds | cc314ee | 2005-08-19 18:02:56 -0700 | [diff] [blame] | 1528 | void * (*follow_link) (struct dentry *, struct nameidata *); |
| 1529 | void (*put_link) (struct dentry *, struct nameidata *, void *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1530 | void (*truncate) (struct inode *); |
Al Viro | e6305c4 | 2008-07-15 21:03:57 -0400 | [diff] [blame] | 1531 | int (*permission) (struct inode *, int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1532 | int (*setattr) (struct dentry *, struct iattr *); |
| 1533 | int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *); |
| 1534 | int (*setxattr) (struct dentry *, const char *,const void *,size_t,int); |
| 1535 | ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t); |
| 1536 | ssize_t (*listxattr) (struct dentry *, char *, size_t); |
| 1537 | int (*removexattr) (struct dentry *, const char *); |
Badari Pulavarty | f6b3ec2 | 2006-01-06 00:10:38 -0800 | [diff] [blame] | 1538 | void (*truncate_range)(struct inode *, loff_t, loff_t); |
Amit Arora | 97ac735 | 2007-07-17 21:42:44 -0400 | [diff] [blame] | 1539 | long (*fallocate)(struct inode *inode, int mode, loff_t offset, |
| 1540 | loff_t len); |
Mark Fasheh | c4b929b | 2008-10-08 19:44:18 -0400 | [diff] [blame] | 1541 | int (*fiemap)(struct inode *, struct fiemap_extent_info *, u64 start, |
| 1542 | u64 len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1543 | }; |
| 1544 | |
| 1545 | struct seq_file; |
| 1546 | |
Badari Pulavarty | eed4e51 | 2006-09-30 23:28:49 -0700 | [diff] [blame] | 1547 | ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector, |
| 1548 | unsigned long nr_segs, unsigned long fast_segs, |
| 1549 | struct iovec *fast_pointer, |
| 1550 | struct iovec **ret_pointer); |
| 1551 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1552 | extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *); |
| 1553 | extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *); |
| 1554 | extern ssize_t vfs_readv(struct file *, const struct iovec __user *, |
| 1555 | unsigned long, loff_t *); |
| 1556 | extern ssize_t vfs_writev(struct file *, const struct iovec __user *, |
| 1557 | unsigned long, loff_t *); |
| 1558 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1559 | struct super_operations { |
| 1560 | struct inode *(*alloc_inode)(struct super_block *sb); |
| 1561 | void (*destroy_inode)(struct inode *); |
| 1562 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1563 | void (*dirty_inode) (struct inode *); |
| 1564 | int (*write_inode) (struct inode *, int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1565 | void (*drop_inode) (struct inode *); |
| 1566 | void (*delete_inode) (struct inode *); |
| 1567 | void (*put_super) (struct super_block *); |
| 1568 | void (*write_super) (struct super_block *); |
| 1569 | int (*sync_fs)(struct super_block *sb, int wait); |
Takashi Sato | c4be0c1 | 2009-01-09 16:40:58 -0800 | [diff] [blame] | 1570 | int (*freeze_fs) (struct super_block *); |
| 1571 | int (*unfreeze_fs) (struct super_block *); |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 1572 | int (*statfs) (struct dentry *, struct kstatfs *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1573 | int (*remount_fs) (struct super_block *, int *, char *); |
| 1574 | void (*clear_inode) (struct inode *); |
Al Viro | 42faad9 | 2008-04-24 07:21:56 -0400 | [diff] [blame] | 1575 | void (*umount_begin) (struct super_block *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1576 | |
| 1577 | int (*show_options)(struct seq_file *, struct vfsmount *); |
Chuck Lever | b4629fe | 2006-03-20 13:44:12 -0500 | [diff] [blame] | 1578 | int (*show_stats)(struct seq_file *, struct vfsmount *); |
Alexey Dobriyan | 0e51a72 | 2006-09-29 01:59:56 -0700 | [diff] [blame] | 1579 | #ifdef CONFIG_QUOTA |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1580 | ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t); |
| 1581 | ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t); |
Alexey Dobriyan | 0e51a72 | 2006-09-29 01:59:56 -0700 | [diff] [blame] | 1582 | #endif |
Theodore Ts'o | 87d8fe1 | 2009-01-03 09:47:09 -0500 | [diff] [blame] | 1583 | int (*bdev_try_to_free_page)(struct super_block*, struct page*, gfp_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1584 | }; |
| 1585 | |
Joern Engel | 1c0eeaf | 2007-10-16 23:30:44 -0700 | [diff] [blame] | 1586 | /* |
| 1587 | * Inode state bits. Protected by inode_lock. |
| 1588 | * |
| 1589 | * Three bits determine the dirty state of the inode, I_DIRTY_SYNC, |
| 1590 | * I_DIRTY_DATASYNC and I_DIRTY_PAGES. |
| 1591 | * |
| 1592 | * Four bits define the lifetime of an inode. Initially, inodes are I_NEW, |
| 1593 | * until that flag is cleared. I_WILL_FREE, I_FREEING and I_CLEAR are set at |
| 1594 | * various stages of removing an inode. |
| 1595 | * |
| 1596 | * Two bits are used for locking and completion notification, I_LOCK and I_SYNC. |
| 1597 | * |
Joern Engel | e7ca2d4 | 2008-02-06 01:36:59 -0800 | [diff] [blame] | 1598 | * I_DIRTY_SYNC Inode is dirty, but doesn't have to be written on |
| 1599 | * fdatasync(). i_atime is the usual cause. |
Jan Kara | 000cb48 | 2008-02-14 19:31:32 -0800 | [diff] [blame] | 1600 | * I_DIRTY_DATASYNC Data-related inode changes pending. We keep track of |
| 1601 | * these changes separately from I_DIRTY_SYNC so that we |
| 1602 | * don't have to write inode on fdatasync() when only |
| 1603 | * mtime has changed in it. |
Joern Engel | 1c0eeaf | 2007-10-16 23:30:44 -0700 | [diff] [blame] | 1604 | * I_DIRTY_PAGES Inode has dirty pages. Inode itself may be clean. |
| 1605 | * I_NEW get_new_inode() sets i_state to I_LOCK|I_NEW. Both |
| 1606 | * are cleared by unlock_new_inode(), called from iget(). |
| 1607 | * I_WILL_FREE Must be set when calling write_inode_now() if i_count |
| 1608 | * is zero. I_FREEING must be set when I_WILL_FREE is |
| 1609 | * cleared. |
| 1610 | * I_FREEING Set when inode is about to be freed but still has dirty |
| 1611 | * pages or buffers attached or the inode itself is still |
| 1612 | * dirty. |
| 1613 | * I_CLEAR Set by clear_inode(). In this state the inode is clean |
| 1614 | * and can be destroyed. |
| 1615 | * |
| 1616 | * Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are |
| 1617 | * prohibited for many purposes. iget() must wait for |
| 1618 | * the inode to be completely released, then create it |
| 1619 | * anew. Other functions will just ignore such inodes, |
| 1620 | * if appropriate. I_LOCK is used for waiting. |
| 1621 | * |
| 1622 | * I_LOCK Serves as both a mutex and completion notification. |
| 1623 | * New inodes set I_LOCK. If two processes both create |
| 1624 | * the same inode, one of them will release its inode and |
| 1625 | * wait for I_LOCK to be released before returning. |
| 1626 | * Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can |
| 1627 | * also cause waiting on I_LOCK, without I_LOCK actually |
| 1628 | * being set. find_inode() uses this to prevent returning |
| 1629 | * nearly-dead inodes. |
| 1630 | * I_SYNC Similar to I_LOCK, but limited in scope to writeback |
Joe Perches | fd3f898 | 2008-02-03 17:45:46 +0200 | [diff] [blame] | 1631 | * of inode dirty data. Having a separate lock for this |
Joern Engel | 1c0eeaf | 2007-10-16 23:30:44 -0700 | [diff] [blame] | 1632 | * purpose reduces latency and prevents some filesystem- |
| 1633 | * specific deadlocks. |
| 1634 | * |
Joern Engel | 1c0eeaf | 2007-10-16 23:30:44 -0700 | [diff] [blame] | 1635 | * Q: What is the difference between I_WILL_FREE and I_FREEING? |
| 1636 | * Q: igrab() only checks on (I_FREEING|I_WILL_FREE). Should it also check on |
| 1637 | * I_CLEAR? If not, why? |
| 1638 | */ |
| 1639 | #define I_DIRTY_SYNC 1 |
| 1640 | #define I_DIRTY_DATASYNC 2 |
| 1641 | #define I_DIRTY_PAGES 4 |
| 1642 | #define I_NEW 8 |
| 1643 | #define I_WILL_FREE 16 |
| 1644 | #define I_FREEING 32 |
| 1645 | #define I_CLEAR 64 |
| 1646 | #define __I_LOCK 7 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1647 | #define I_LOCK (1 << __I_LOCK) |
Joern Engel | 1c0eeaf | 2007-10-16 23:30:44 -0700 | [diff] [blame] | 1648 | #define __I_SYNC 8 |
| 1649 | #define I_SYNC (1 << __I_SYNC) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1650 | |
| 1651 | #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES) |
| 1652 | |
| 1653 | extern void __mark_inode_dirty(struct inode *, int); |
| 1654 | static inline void mark_inode_dirty(struct inode *inode) |
| 1655 | { |
| 1656 | __mark_inode_dirty(inode, I_DIRTY); |
| 1657 | } |
| 1658 | |
| 1659 | static inline void mark_inode_dirty_sync(struct inode *inode) |
| 1660 | { |
| 1661 | __mark_inode_dirty(inode, I_DIRTY_SYNC); |
| 1662 | } |
| 1663 | |
Dave Hansen | 71c4215 | 2007-06-23 17:16:42 -0700 | [diff] [blame] | 1664 | /** |
| 1665 | * inc_nlink - directly increment an inode's link count |
| 1666 | * @inode: inode |
| 1667 | * |
| 1668 | * This is a low-level filesystem helper to replace any |
| 1669 | * direct filesystem manipulation of i_nlink. Currently, |
| 1670 | * it is only here for parity with dec_nlink(). |
| 1671 | */ |
Dave Hansen | d8c76e6 | 2006-09-30 23:29:04 -0700 | [diff] [blame] | 1672 | static inline void inc_nlink(struct inode *inode) |
Alexey Dobriyan | 66d2173 | 2006-03-23 03:00:51 -0800 | [diff] [blame] | 1673 | { |
| 1674 | inode->i_nlink++; |
Dave Hansen | d8c76e6 | 2006-09-30 23:29:04 -0700 | [diff] [blame] | 1675 | } |
| 1676 | |
| 1677 | static inline void inode_inc_link_count(struct inode *inode) |
| 1678 | { |
| 1679 | inc_nlink(inode); |
Alexey Dobriyan | 66d2173 | 2006-03-23 03:00:51 -0800 | [diff] [blame] | 1680 | mark_inode_dirty(inode); |
| 1681 | } |
| 1682 | |
Dave Hansen | 71c4215 | 2007-06-23 17:16:42 -0700 | [diff] [blame] | 1683 | /** |
| 1684 | * drop_nlink - directly drop an inode's link count |
| 1685 | * @inode: inode |
| 1686 | * |
| 1687 | * This is a low-level filesystem helper to replace any |
| 1688 | * direct filesystem manipulation of i_nlink. In cases |
| 1689 | * where we are attempting to track writes to the |
| 1690 | * filesystem, a decrement to zero means an imminent |
| 1691 | * write when the file is truncated and actually unlinked |
| 1692 | * on the filesystem. |
| 1693 | */ |
Dave Hansen | 9a53c3a | 2006-09-30 23:29:03 -0700 | [diff] [blame] | 1694 | static inline void drop_nlink(struct inode *inode) |
Alexey Dobriyan | 66d2173 | 2006-03-23 03:00:51 -0800 | [diff] [blame] | 1695 | { |
| 1696 | inode->i_nlink--; |
Dave Hansen | 9a53c3a | 2006-09-30 23:29:03 -0700 | [diff] [blame] | 1697 | } |
| 1698 | |
Dave Hansen | 71c4215 | 2007-06-23 17:16:42 -0700 | [diff] [blame] | 1699 | /** |
| 1700 | * clear_nlink - directly zero an inode's link count |
| 1701 | * @inode: inode |
| 1702 | * |
| 1703 | * This is a low-level filesystem helper to replace any |
| 1704 | * direct filesystem manipulation of i_nlink. See |
| 1705 | * drop_nlink() for why we care about i_nlink hitting zero. |
| 1706 | */ |
Dave Hansen | ce71ec3 | 2006-09-30 23:29:06 -0700 | [diff] [blame] | 1707 | static inline void clear_nlink(struct inode *inode) |
| 1708 | { |
| 1709 | inode->i_nlink = 0; |
| 1710 | } |
| 1711 | |
Dave Hansen | 9a53c3a | 2006-09-30 23:29:03 -0700 | [diff] [blame] | 1712 | static inline void inode_dec_link_count(struct inode *inode) |
| 1713 | { |
| 1714 | drop_nlink(inode); |
Alexey Dobriyan | 66d2173 | 2006-03-23 03:00:51 -0800 | [diff] [blame] | 1715 | mark_inode_dirty(inode); |
| 1716 | } |
| 1717 | |
Jean Noel Cordenner | 25ec56b | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1718 | /** |
| 1719 | * inode_inc_iversion - increments i_version |
| 1720 | * @inode: inode that need to be updated |
| 1721 | * |
| 1722 | * Every time the inode is modified, the i_version field will be incremented. |
| 1723 | * The filesystem has to be mounted with i_version flag |
| 1724 | */ |
| 1725 | |
| 1726 | static inline void inode_inc_iversion(struct inode *inode) |
| 1727 | { |
| 1728 | spin_lock(&inode->i_lock); |
| 1729 | inode->i_version++; |
| 1730 | spin_unlock(&inode->i_lock); |
| 1731 | } |
| 1732 | |
Christoph Hellwig | 869243a | 2006-01-09 20:52:03 -0800 | [diff] [blame] | 1733 | extern void touch_atime(struct vfsmount *mnt, struct dentry *dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1734 | static inline void file_accessed(struct file *file) |
| 1735 | { |
| 1736 | if (!(file->f_flags & O_NOATIME)) |
Josef "Jeff" Sipek | 0f7fc9e | 2006-12-08 02:36:35 -0800 | [diff] [blame] | 1737 | touch_atime(file->f_path.mnt, file->f_path.dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1738 | } |
| 1739 | |
| 1740 | int sync_inode(struct inode *inode, struct writeback_control *wbc); |
| 1741 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1742 | struct file_system_type { |
| 1743 | const char *name; |
| 1744 | int fs_flags; |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 1745 | int (*get_sb) (struct file_system_type *, int, |
| 1746 | const char *, void *, struct vfsmount *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1747 | void (*kill_sb) (struct super_block *); |
| 1748 | struct module *owner; |
| 1749 | struct file_system_type * next; |
| 1750 | struct list_head fs_supers; |
Peter Zijlstra | d475fd4 | 2007-10-15 14:51:31 +0200 | [diff] [blame] | 1751 | |
Ingo Molnar | cf51624 | 2006-07-03 00:25:27 -0700 | [diff] [blame] | 1752 | struct lock_class_key s_lock_key; |
Arjan van de Ven | 897c6ff | 2006-07-03 00:25:28 -0700 | [diff] [blame] | 1753 | struct lock_class_key s_umount_key; |
Peter Zijlstra | d475fd4 | 2007-10-15 14:51:31 +0200 | [diff] [blame] | 1754 | |
| 1755 | struct lock_class_key i_lock_key; |
| 1756 | struct lock_class_key i_mutex_key; |
Peter Zijlstra | 14358e6 | 2007-10-14 01:38:33 +0200 | [diff] [blame] | 1757 | struct lock_class_key i_mutex_dir_key; |
Peter Zijlstra | d475fd4 | 2007-10-15 14:51:31 +0200 | [diff] [blame] | 1758 | struct lock_class_key i_alloc_sem_key; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1759 | }; |
| 1760 | |
Serge E. Hallyn | 909e6d9 | 2009-04-06 19:01:07 -0700 | [diff] [blame] | 1761 | extern int get_sb_ns(struct file_system_type *fs_type, int flags, void *data, |
| 1762 | int (*fill_super)(struct super_block *, void *, int), |
| 1763 | struct vfsmount *mnt); |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 1764 | extern int get_sb_bdev(struct file_system_type *fs_type, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1765 | int flags, const char *dev_name, void *data, |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 1766 | int (*fill_super)(struct super_block *, void *, int), |
| 1767 | struct vfsmount *mnt); |
| 1768 | extern int get_sb_single(struct file_system_type *fs_type, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1769 | int flags, void *data, |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 1770 | int (*fill_super)(struct super_block *, void *, int), |
| 1771 | struct vfsmount *mnt); |
| 1772 | extern int get_sb_nodev(struct file_system_type *fs_type, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1773 | int flags, void *data, |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 1774 | int (*fill_super)(struct super_block *, void *, int), |
| 1775 | struct vfsmount *mnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1776 | void generic_shutdown_super(struct super_block *sb); |
| 1777 | void kill_block_super(struct super_block *sb); |
| 1778 | void kill_anon_super(struct super_block *sb); |
| 1779 | void kill_litter_super(struct super_block *sb); |
| 1780 | void deactivate_super(struct super_block *sb); |
| 1781 | int set_anon_super(struct super_block *s, void *data); |
| 1782 | struct super_block *sget(struct file_system_type *type, |
| 1783 | int (*test)(struct super_block *,void *), |
| 1784 | int (*set)(struct super_block *,void *), |
| 1785 | void *data); |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 1786 | extern int get_sb_pseudo(struct file_system_type *, char *, |
Josef 'Jeff' Sipek | ee9b6d6 | 2007-02-12 00:55:41 -0800 | [diff] [blame] | 1787 | const struct super_operations *ops, unsigned long, |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 1788 | struct vfsmount *mnt); |
Sukadev Bhattiprolu | a3ec947 | 2009-03-04 12:06:34 -0800 | [diff] [blame] | 1789 | extern void simple_set_mnt(struct vfsmount *mnt, struct super_block *sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1790 | int __put_super_and_need_restart(struct super_block *sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1791 | |
| 1792 | /* Alas, no aliases. Too much hassle with bringing module.h everywhere */ |
| 1793 | #define fops_get(fops) \ |
| 1794 | (((fops) && try_module_get((fops)->owner) ? (fops) : NULL)) |
| 1795 | #define fops_put(fops) \ |
| 1796 | do { if (fops) module_put((fops)->owner); } while(0) |
| 1797 | |
| 1798 | extern int register_filesystem(struct file_system_type *); |
| 1799 | extern int unregister_filesystem(struct file_system_type *); |
Pavel Emelyanov | 8bf9725 | 2007-10-18 23:40:02 -0700 | [diff] [blame] | 1800 | extern struct vfsmount *kern_mount_data(struct file_system_type *, void *data); |
| 1801 | #define kern_mount(type) kern_mount_data(type, NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1802 | extern int may_umount_tree(struct vfsmount *); |
| 1803 | extern int may_umount(struct vfsmount *); |
| 1804 | extern long do_mount(char *, char *, char *, unsigned long, void *); |
Al Viro | 8aec080 | 2007-06-07 12:20:32 -0400 | [diff] [blame] | 1805 | extern struct vfsmount *collect_mounts(struct vfsmount *, struct dentry *); |
| 1806 | extern void drop_collected_mounts(struct vfsmount *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1807 | |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 1808 | extern int vfs_statfs(struct dentry *, struct kstatfs *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1809 | |
Al Viro | ce3b0f8 | 2009-03-29 19:08:22 -0400 | [diff] [blame] | 1810 | extern int current_umask(void); |
| 1811 | |
Miklos Szeredi | f87fd4c | 2006-01-16 22:14:23 -0800 | [diff] [blame] | 1812 | /* /sys/fs */ |
Greg Kroah-Hartman | 00d2666 | 2007-10-29 14:17:23 -0600 | [diff] [blame] | 1813 | extern struct kobject *fs_kobj; |
Miklos Szeredi | f87fd4c | 2006-01-16 22:14:23 -0800 | [diff] [blame] | 1814 | |
Thomas Petazzoni | bfcd17a | 2008-08-06 15:12:22 +0200 | [diff] [blame] | 1815 | extern int rw_verify_area(int, struct file *, loff_t *, size_t); |
| 1816 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1817 | #define FLOCK_VERIFY_READ 1 |
| 1818 | #define FLOCK_VERIFY_WRITE 2 |
| 1819 | |
Thomas Petazzoni | bfcd17a | 2008-08-06 15:12:22 +0200 | [diff] [blame] | 1820 | #ifdef CONFIG_FILE_LOCKING |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1821 | extern int locks_mandatory_locked(struct inode *); |
| 1822 | extern int locks_mandatory_area(int, struct inode *, struct file *, loff_t, size_t); |
| 1823 | |
| 1824 | /* |
| 1825 | * Candidates for mandatory locking have the setgid bit set |
| 1826 | * but no group execute bit - an otherwise meaningless combination. |
| 1827 | */ |
Pavel Emelyanov | a16877c | 2007-10-01 14:41:11 -0700 | [diff] [blame] | 1828 | |
| 1829 | static inline int __mandatory_lock(struct inode *ino) |
| 1830 | { |
| 1831 | return (ino->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID; |
| 1832 | } |
| 1833 | |
| 1834 | /* |
| 1835 | * ... and these candidates should be on MS_MANDLOCK mounted fs, |
| 1836 | * otherwise these will be advisory locks |
| 1837 | */ |
| 1838 | |
| 1839 | static inline int mandatory_lock(struct inode *ino) |
| 1840 | { |
| 1841 | return IS_MANDLOCK(ino) && __mandatory_lock(ino); |
| 1842 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1843 | |
| 1844 | static inline int locks_verify_locked(struct inode *inode) |
| 1845 | { |
Pavel Emelyanov | a16877c | 2007-10-01 14:41:11 -0700 | [diff] [blame] | 1846 | if (mandatory_lock(inode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1847 | return locks_mandatory_locked(inode); |
| 1848 | return 0; |
| 1849 | } |
| 1850 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1851 | static inline int locks_verify_truncate(struct inode *inode, |
| 1852 | struct file *filp, |
| 1853 | loff_t size) |
| 1854 | { |
Pavel Emelyanov | a16877c | 2007-10-01 14:41:11 -0700 | [diff] [blame] | 1855 | if (inode->i_flock && mandatory_lock(inode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1856 | return locks_mandatory_area( |
| 1857 | FLOCK_VERIFY_WRITE, inode, filp, |
| 1858 | size < inode->i_size ? size : inode->i_size, |
| 1859 | (size < inode->i_size ? inode->i_size - size |
| 1860 | : size - inode->i_size) |
| 1861 | ); |
| 1862 | return 0; |
| 1863 | } |
| 1864 | |
| 1865 | static inline int break_lease(struct inode *inode, unsigned int mode) |
| 1866 | { |
| 1867 | if (inode->i_flock) |
| 1868 | return __break_lease(inode, mode); |
| 1869 | return 0; |
| 1870 | } |
Thomas Petazzoni | bfcd17a | 2008-08-06 15:12:22 +0200 | [diff] [blame] | 1871 | #else /* !CONFIG_FILE_LOCKING */ |
Steven Whitehouse | af5df56 | 2009-01-20 10:29:46 +0000 | [diff] [blame] | 1872 | static inline int locks_mandatory_locked(struct inode *inode) |
| 1873 | { |
| 1874 | return 0; |
| 1875 | } |
| 1876 | |
| 1877 | static inline int locks_mandatory_area(int rw, struct inode *inode, |
| 1878 | struct file *filp, loff_t offset, |
| 1879 | size_t count) |
| 1880 | { |
| 1881 | return 0; |
| 1882 | } |
| 1883 | |
| 1884 | static inline int __mandatory_lock(struct inode *inode) |
| 1885 | { |
| 1886 | return 0; |
| 1887 | } |
| 1888 | |
| 1889 | static inline int mandatory_lock(struct inode *inode) |
| 1890 | { |
| 1891 | return 0; |
| 1892 | } |
| 1893 | |
| 1894 | static inline int locks_verify_locked(struct inode *inode) |
| 1895 | { |
| 1896 | return 0; |
| 1897 | } |
| 1898 | |
| 1899 | static inline int locks_verify_truncate(struct inode *inode, struct file *filp, |
| 1900 | size_t size) |
| 1901 | { |
| 1902 | return 0; |
| 1903 | } |
| 1904 | |
| 1905 | static inline int break_lease(struct inode *inode, unsigned int mode) |
| 1906 | { |
| 1907 | return 0; |
| 1908 | } |
| 1909 | |
Thomas Petazzoni | bfcd17a | 2008-08-06 15:12:22 +0200 | [diff] [blame] | 1910 | #endif /* CONFIG_FILE_LOCKING */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1911 | |
| 1912 | /* fs/open.c */ |
| 1913 | |
NeilBrown | 4a30131 | 2006-01-08 01:02:39 -0800 | [diff] [blame] | 1914 | extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs, |
| 1915 | struct file *filp); |
Jason Uhlenkott | 8e8a140 | 2007-10-20 03:16:18 +0200 | [diff] [blame] | 1916 | extern long do_sys_open(int dfd, const char __user *filename, int flags, |
Ulrich Drepper | 5590ff0 | 2006-01-18 17:43:53 -0800 | [diff] [blame] | 1917 | int mode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1918 | extern struct file *filp_open(const char *, int, int); |
David Howells | 745ca24 | 2008-11-14 10:39:22 +1100 | [diff] [blame] | 1919 | extern struct file * dentry_open(struct dentry *, struct vfsmount *, int, |
| 1920 | const struct cred *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1921 | extern int filp_close(struct file *, fl_owner_t id); |
| 1922 | extern char * getname(const char __user *); |
| 1923 | |
| 1924 | /* fs/dcache.c */ |
| 1925 | extern void __init vfs_caches_init_early(void); |
| 1926 | extern void __init vfs_caches_init(unsigned long); |
| 1927 | |
Christoph Lameter | b86c089 | 2006-12-06 20:32:57 -0800 | [diff] [blame] | 1928 | extern struct kmem_cache *names_cachep; |
| 1929 | |
Christoph Lameter | e94b176 | 2006-12-06 20:33:17 -0800 | [diff] [blame] | 1930 | #define __getname() kmem_cache_alloc(names_cachep, GFP_KERNEL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1931 | #define __putname(name) kmem_cache_free(names_cachep, (void *)(name)) |
| 1932 | #ifndef CONFIG_AUDITSYSCALL |
| 1933 | #define putname(name) __putname(name) |
| 1934 | #else |
| 1935 | extern void putname(const char *name); |
| 1936 | #endif |
| 1937 | |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 1938 | #ifdef CONFIG_BLOCK |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1939 | extern int register_blkdev(unsigned int, const char *); |
Akinobu Mita | f448024 | 2007-07-17 04:03:47 -0700 | [diff] [blame] | 1940 | extern void unregister_blkdev(unsigned int, const char *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1941 | extern struct block_device *bdget(dev_t); |
| 1942 | extern void bd_set_size(struct block_device *, loff_t size); |
| 1943 | extern void bd_forget(struct inode *inode); |
| 1944 | extern void bdput(struct block_device *); |
Al Viro | aeb5d72 | 2008-09-02 15:28:45 -0400 | [diff] [blame] | 1945 | extern struct block_device *open_by_devnum(dev_t, fmode_t); |
Nick Piggin | 585d3bc | 2009-02-25 10:44:19 +0100 | [diff] [blame] | 1946 | extern void invalidate_bdev(struct block_device *); |
| 1947 | extern int sync_blockdev(struct block_device *bdev); |
| 1948 | extern struct super_block *freeze_bdev(struct block_device *); |
Eric Sandeen | c2d7543 | 2009-03-31 15:23:46 -0700 | [diff] [blame] | 1949 | extern void emergency_thaw_all(void); |
Nick Piggin | 585d3bc | 2009-02-25 10:44:19 +0100 | [diff] [blame] | 1950 | extern int thaw_bdev(struct block_device *bdev, struct super_block *sb); |
| 1951 | extern int fsync_bdev(struct block_device *); |
| 1952 | extern int fsync_super(struct super_block *); |
| 1953 | extern int fsync_no_super(struct block_device *); |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 1954 | #else |
| 1955 | static inline void bd_forget(struct inode *inode) {} |
Al Viro | 47e4491 | 2009-04-01 07:07:16 -0400 | [diff] [blame] | 1956 | static inline int sync_blockdev(struct block_device *bdev) { return 0; } |
| 1957 | static inline void invalidate_bdev(struct block_device *bdev) {} |
| 1958 | |
| 1959 | static inline struct super_block *freeze_bdev(struct block_device *sb) |
| 1960 | { |
| 1961 | return NULL; |
| 1962 | } |
| 1963 | |
| 1964 | static inline int thaw_bdev(struct block_device *bdev, struct super_block *sb) |
| 1965 | { |
| 1966 | return 0; |
| 1967 | } |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 1968 | #endif |
| 1969 | extern const struct file_operations def_blk_fops; |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 1970 | extern const struct file_operations def_chr_fops; |
| 1971 | extern const struct file_operations bad_sock_fops; |
| 1972 | extern const struct file_operations def_fifo_fops; |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 1973 | #ifdef CONFIG_BLOCK |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1974 | extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long); |
Al Viro | 56b26ad | 2008-09-19 03:17:36 -0400 | [diff] [blame] | 1975 | extern int blkdev_ioctl(struct block_device *, fmode_t, unsigned, unsigned long); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1976 | extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long); |
Al Viro | 572c489 | 2007-10-08 13:24:05 -0400 | [diff] [blame] | 1977 | extern int blkdev_get(struct block_device *, fmode_t); |
Al Viro | 9a1c354 | 2008-02-22 20:40:24 -0500 | [diff] [blame] | 1978 | extern int blkdev_put(struct block_device *, fmode_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1979 | extern int bd_claim(struct block_device *, void *); |
| 1980 | extern void bd_release(struct block_device *); |
Jun'ichi Nomura | 641dc63 | 2006-03-27 01:17:57 -0800 | [diff] [blame] | 1981 | #ifdef CONFIG_SYSFS |
| 1982 | extern int bd_claim_by_disk(struct block_device *, void *, struct gendisk *); |
| 1983 | extern void bd_release_from_disk(struct block_device *, struct gendisk *); |
| 1984 | #else |
| 1985 | #define bd_claim_by_disk(bdev, holder, disk) bd_claim(bdev, holder) |
| 1986 | #define bd_release_from_disk(bdev, disk) bd_release(bdev) |
| 1987 | #endif |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 1988 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1989 | |
| 1990 | /* fs/char_dev.c */ |
Joe Korty | 68eef3b | 2006-03-31 02:30:32 -0800 | [diff] [blame] | 1991 | #define CHRDEV_MAJOR_HASH_SIZE 255 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1992 | extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *); |
| 1993 | extern int register_chrdev_region(dev_t, unsigned, const char *); |
| 1994 | extern int register_chrdev(unsigned int, const char *, |
Arjan van de Ven | 99ac48f | 2006-03-28 01:56:41 -0800 | [diff] [blame] | 1995 | const struct file_operations *); |
Akinobu Mita | e53252d | 2007-07-19 01:47:51 -0700 | [diff] [blame] | 1996 | extern void unregister_chrdev(unsigned int, const char *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1997 | extern void unregister_chrdev_region(dev_t, unsigned); |
Joe Korty | 68eef3b | 2006-03-31 02:30:32 -0800 | [diff] [blame] | 1998 | extern void chrdev_show(struct seq_file *,off_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1999 | |
| 2000 | /* fs/block_dev.c */ |
| 2001 | #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */ |
Tejun Heo | 1f01429 | 2008-08-25 19:47:23 +0900 | [diff] [blame] | 2002 | #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */ |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2003 | |
| 2004 | #ifdef CONFIG_BLOCK |
| 2005 | #define BLKDEV_MAJOR_HASH_SIZE 255 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2006 | extern const char *__bdevname(dev_t, char *buffer); |
| 2007 | extern const char *bdevname(struct block_device *bdev, char *buffer); |
| 2008 | extern struct block_device *lookup_bdev(const char *); |
Al Viro | 30c40d2 | 2008-02-22 19:50:45 -0500 | [diff] [blame] | 2009 | extern struct block_device *open_bdev_exclusive(const char *, fmode_t, void *); |
| 2010 | extern void close_bdev_exclusive(struct block_device *, fmode_t); |
Joe Korty | 68eef3b | 2006-03-31 02:30:32 -0800 | [diff] [blame] | 2011 | extern void blkdev_show(struct seq_file *,off_t); |
Al Viro | 30c40d2 | 2008-02-22 19:50:45 -0500 | [diff] [blame] | 2012 | |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2013 | #else |
| 2014 | #define BLKDEV_MAJOR_HASH_SIZE 0 |
| 2015 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2016 | |
| 2017 | extern void init_special_inode(struct inode *, umode_t, dev_t); |
| 2018 | |
| 2019 | /* Invalid inode operations -- fs/bad_inode.c */ |
| 2020 | extern void make_bad_inode(struct inode *); |
| 2021 | extern int is_bad_inode(struct inode *); |
| 2022 | |
Denys Vlasenko | d2d9648 | 2008-07-01 14:16:09 +0200 | [diff] [blame] | 2023 | extern const struct file_operations read_pipefifo_fops; |
| 2024 | extern const struct file_operations write_pipefifo_fops; |
| 2025 | extern const struct file_operations rdwr_pipefifo_fops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2026 | |
| 2027 | extern int fs_may_remount_ro(struct super_block *); |
| 2028 | |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2029 | #ifdef CONFIG_BLOCK |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2030 | /* |
| 2031 | * return READ, READA, or WRITE |
| 2032 | */ |
| 2033 | #define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK)) |
| 2034 | |
| 2035 | /* |
| 2036 | * return data direction, READ or WRITE |
| 2037 | */ |
| 2038 | #define bio_data_dir(bio) ((bio)->bi_rw & 1) |
| 2039 | |
Andrew Patterson | c3279d1 | 2008-09-04 14:27:25 -0600 | [diff] [blame] | 2040 | extern void check_disk_size_change(struct gendisk *disk, |
| 2041 | struct block_device *bdev); |
Andrew Patterson | 0c002c2 | 2008-09-04 14:27:20 -0600 | [diff] [blame] | 2042 | extern int revalidate_disk(struct gendisk *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2043 | extern int check_disk_change(struct block_device *); |
Christoph Hellwig | 2ef4163 | 2005-05-05 16:15:59 -0700 | [diff] [blame] | 2044 | extern int __invalidate_device(struct block_device *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2045 | extern int invalidate_partition(struct gendisk *, int); |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2046 | #endif |
| 2047 | extern int invalidate_inodes(struct super_block *); |
Andrew Morton | fc9a07e | 2007-07-15 23:38:14 -0700 | [diff] [blame] | 2048 | unsigned long __invalidate_mapping_pages(struct address_space *mapping, |
| 2049 | pgoff_t start, pgoff_t end, |
| 2050 | bool be_atomic); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2051 | unsigned long invalidate_mapping_pages(struct address_space *mapping, |
| 2052 | pgoff_t start, pgoff_t end); |
Anton Altaparmakov | 54bc485 | 2007-02-10 01:45:38 -0800 | [diff] [blame] | 2053 | |
Andrew Morton | fc0ecff | 2007-02-10 01:45:39 -0800 | [diff] [blame] | 2054 | static inline unsigned long __deprecated |
Anton Altaparmakov | 54bc485 | 2007-02-10 01:45:38 -0800 | [diff] [blame] | 2055 | invalidate_inode_pages(struct address_space *mapping) |
| 2056 | { |
| 2057 | return invalidate_mapping_pages(mapping, 0, ~0UL); |
| 2058 | } |
| 2059 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2060 | static inline void invalidate_remote_inode(struct inode *inode) |
| 2061 | { |
| 2062 | if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || |
| 2063 | S_ISLNK(inode->i_mode)) |
Andrew Morton | fc0ecff | 2007-02-10 01:45:39 -0800 | [diff] [blame] | 2064 | invalidate_mapping_pages(inode->i_mapping, 0, -1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2065 | } |
| 2066 | extern int invalidate_inode_pages2(struct address_space *mapping); |
| 2067 | extern int invalidate_inode_pages2_range(struct address_space *mapping, |
| 2068 | pgoff_t start, pgoff_t end); |
Artem Bityutskiy | 4ee6afd | 2008-05-07 21:01:30 +0300 | [diff] [blame] | 2069 | extern void generic_sync_sb_inodes(struct super_block *sb, |
| 2070 | struct writeback_control *wbc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2071 | extern int write_inode_now(struct inode *, int); |
| 2072 | extern int filemap_fdatawrite(struct address_space *); |
| 2073 | extern int filemap_flush(struct address_space *); |
| 2074 | extern int filemap_fdatawait(struct address_space *); |
| 2075 | extern int filemap_write_and_wait(struct address_space *mapping); |
| 2076 | extern int filemap_write_and_wait_range(struct address_space *mapping, |
| 2077 | loff_t lstart, loff_t lend); |
Andrew Morton | ebcf28e | 2006-03-24 03:18:04 -0800 | [diff] [blame] | 2078 | extern int wait_on_page_writeback_range(struct address_space *mapping, |
| 2079 | pgoff_t start, pgoff_t end); |
| 2080 | extern int __filemap_fdatawrite_range(struct address_space *mapping, |
| 2081 | loff_t start, loff_t end, int sync_mode); |
Jan Kara | f4c0a0f | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 2082 | extern int filemap_fdatawrite_range(struct address_space *mapping, |
| 2083 | loff_t start, loff_t end); |
Andrew Morton | ebcf28e | 2006-03-24 03:18:04 -0800 | [diff] [blame] | 2084 | |
Christoph Hellwig | 4c728ef | 2008-12-22 21:11:15 +0100 | [diff] [blame] | 2085 | extern int vfs_fsync(struct file *file, struct dentry *dentry, int datasync); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2086 | extern void sync_supers(void); |
| 2087 | extern void sync_filesystems(int wait); |
David Howells | cf9a2ae | 2006-08-29 19:05:54 +0100 | [diff] [blame] | 2088 | extern void __fsync_super(struct super_block *sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2089 | extern void emergency_sync(void); |
| 2090 | extern void emergency_remount(void); |
| 2091 | extern int do_remount_sb(struct super_block *sb, int flags, |
| 2092 | void *data, int force); |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2093 | #ifdef CONFIG_BLOCK |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2094 | extern sector_t bmap(struct inode *, sector_t); |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2095 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2096 | extern int notify_change(struct dentry *, struct iattr *); |
Al Viro | f419a2e | 2008-07-22 00:07:17 -0400 | [diff] [blame] | 2097 | extern int inode_permission(struct inode *, int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2098 | extern int generic_permission(struct inode *, int, |
| 2099 | int (*check_acl)(struct inode *, int)); |
| 2100 | |
Miklos Szeredi | f696a36 | 2008-07-31 13:41:58 +0200 | [diff] [blame] | 2101 | static inline bool execute_ok(struct inode *inode) |
| 2102 | { |
| 2103 | return (inode->i_mode & S_IXUGO) || S_ISDIR(inode->i_mode); |
| 2104 | } |
| 2105 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2106 | extern int get_write_access(struct inode *); |
| 2107 | extern int deny_write_access(struct file *); |
| 2108 | static inline void put_write_access(struct inode * inode) |
| 2109 | { |
| 2110 | atomic_dec(&inode->i_writecount); |
| 2111 | } |
| 2112 | static inline void allow_write_access(struct file *file) |
| 2113 | { |
| 2114 | if (file) |
Josef "Jeff" Sipek | 0f7fc9e | 2006-12-08 02:36:35 -0800 | [diff] [blame] | 2115 | atomic_inc(&file->f_path.dentry->d_inode->i_writecount); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2116 | } |
Ulrich Drepper | ed8cae8 | 2008-07-23 21:29:30 -0700 | [diff] [blame] | 2117 | extern int do_pipe_flags(int *, int); |
Ulrich Drepper | be61a86 | 2008-07-23 21:29:40 -0700 | [diff] [blame] | 2118 | extern struct file *create_read_pipe(struct file *f, int flags); |
| 2119 | extern struct file *create_write_pipe(int flags); |
Andi Kleen | d6cbd28 | 2006-09-30 23:29:26 -0700 | [diff] [blame] | 2120 | extern void free_write_pipe(struct file *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2121 | |
Christoph Hellwig | a70e65d | 2008-02-15 14:37:28 -0800 | [diff] [blame] | 2122 | extern struct file *do_filp_open(int dfd, const char *pathname, |
| 2123 | int open_flag, int mode); |
Christoph Hellwig | 3fb6419 | 2008-10-24 09:58:10 +0200 | [diff] [blame] | 2124 | extern int may_open(struct path *, int, int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2125 | |
| 2126 | extern int kernel_read(struct file *, unsigned long, char *, unsigned long); |
| 2127 | extern struct file * open_exec(const char *); |
| 2128 | |
| 2129 | /* fs/dcache.c -- generic fs support functions */ |
| 2130 | extern int is_subdir(struct dentry *, struct dentry *); |
| 2131 | extern ino_t find_inode_number(struct dentry *, struct qstr *); |
| 2132 | |
| 2133 | #include <linux/err.h> |
| 2134 | |
| 2135 | /* needed for stackable file system support */ |
| 2136 | extern loff_t default_llseek(struct file *file, loff_t offset, int origin); |
| 2137 | |
| 2138 | extern loff_t vfs_llseek(struct file *file, loff_t offset, int origin); |
| 2139 | |
David Chinner | 2cb1599 | 2008-10-30 17:32:23 +1100 | [diff] [blame] | 2140 | extern struct inode * inode_init_always(struct super_block *, struct inode *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2141 | extern void inode_init_once(struct inode *); |
David Chinner | 8290c35 | 2008-10-30 17:35:24 +1100 | [diff] [blame] | 2142 | extern void inode_add_to_lists(struct super_block *, struct inode *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2143 | extern void iput(struct inode *); |
| 2144 | extern struct inode * igrab(struct inode *); |
| 2145 | extern ino_t iunique(struct super_block *, ino_t); |
| 2146 | extern int inode_needs_sync(struct inode *inode); |
| 2147 | extern void generic_delete_inode(struct inode *inode); |
Mark Fasheh | cb2c023 | 2005-07-07 17:56:03 -0700 | [diff] [blame] | 2148 | extern void generic_drop_inode(struct inode *inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2149 | |
Anton Altaparmakov | 88bd512 | 2005-07-13 01:10:44 -0700 | [diff] [blame] | 2150 | extern struct inode *ilookup5_nowait(struct super_block *sb, |
| 2151 | unsigned long hashval, int (*test)(struct inode *, void *), |
| 2152 | void *data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2153 | extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval, |
| 2154 | int (*test)(struct inode *, void *), void *data); |
| 2155 | extern struct inode *ilookup(struct super_block *sb, unsigned long ino); |
| 2156 | |
| 2157 | extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *); |
| 2158 | extern struct inode * iget_locked(struct super_block *, unsigned long); |
Al Viro | 261bca8 | 2008-12-30 01:48:21 -0500 | [diff] [blame] | 2159 | extern int insert_inode_locked4(struct inode *, unsigned long, int (*test)(struct inode *, void *), void *); |
| 2160 | extern int insert_inode_locked(struct inode *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2161 | extern void unlock_new_inode(struct inode *); |
| 2162 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2163 | extern void __iget(struct inode * inode); |
David Howells | b46980f | 2008-02-07 00:15:27 -0800 | [diff] [blame] | 2164 | extern void iget_failed(struct inode *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2165 | extern void clear_inode(struct inode *); |
| 2166 | extern void destroy_inode(struct inode *); |
| 2167 | extern struct inode *new_inode(struct super_block *); |
Jens Axboe | 01de85e | 2006-10-17 19:50:36 +0200 | [diff] [blame] | 2168 | extern int should_remove_suid(struct dentry *); |
Miklos Szeredi | 2f1936b | 2008-06-24 16:50:14 +0200 | [diff] [blame] | 2169 | extern int file_remove_suid(struct file *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2170 | |
| 2171 | extern void __insert_inode_hash(struct inode *, unsigned long hashval); |
| 2172 | extern void remove_inode_hash(struct inode *); |
| 2173 | static inline void insert_inode_hash(struct inode *inode) { |
| 2174 | __insert_inode_hash(inode, inode->i_ino); |
| 2175 | } |
| 2176 | |
| 2177 | extern struct file * get_empty_filp(void); |
| 2178 | extern void file_move(struct file *f, struct list_head *list); |
| 2179 | extern void file_kill(struct file *f); |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2180 | #ifdef CONFIG_BLOCK |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2181 | struct bio; |
| 2182 | extern void submit_bio(int, struct bio *); |
| 2183 | extern int bdev_read_only(struct block_device *); |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2184 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2185 | extern int set_blocksize(struct block_device *, int); |
| 2186 | extern int sb_set_blocksize(struct super_block *, int); |
| 2187 | extern int sb_min_blocksize(struct super_block *, int); |
Fengguang Wu | 08d8e97 | 2007-10-16 23:30:39 -0700 | [diff] [blame] | 2188 | extern int sb_has_dirty_inodes(struct super_block *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2189 | |
| 2190 | extern int generic_file_mmap(struct file *, struct vm_area_struct *); |
| 2191 | extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *); |
| 2192 | extern int file_read_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2193 | int generic_write_checks(struct file *file, loff_t *pos, size_t *count, int isblk); |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 2194 | extern ssize_t generic_file_aio_read(struct kiocb *, const struct iovec *, unsigned long, loff_t); |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 2195 | extern ssize_t generic_file_aio_write(struct kiocb *, const struct iovec *, unsigned long, loff_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2196 | extern ssize_t generic_file_aio_write_nolock(struct kiocb *, const struct iovec *, |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 2197 | unsigned long, loff_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2198 | extern ssize_t generic_file_direct_write(struct kiocb *, const struct iovec *, |
| 2199 | unsigned long *, loff_t, loff_t *, size_t, size_t); |
| 2200 | extern ssize_t generic_file_buffered_write(struct kiocb *, const struct iovec *, |
| 2201 | unsigned long, loff_t, loff_t *, size_t, ssize_t); |
| 2202 | extern ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos); |
| 2203 | extern ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos); |
Dmitriy Monakhov | 0ceb331 | 2007-05-08 00:23:02 -0700 | [diff] [blame] | 2204 | extern int generic_segment_checks(const struct iovec *iov, |
| 2205 | unsigned long *nr_segs, size_t *count, int access_flags); |
Andrew Morton | 88e6fae | 2006-04-11 13:59:36 +0200 | [diff] [blame] | 2206 | |
| 2207 | /* fs/splice.c */ |
Jens Axboe | cbb7e57 | 2006-04-11 14:57:50 +0200 | [diff] [blame] | 2208 | extern ssize_t generic_file_splice_read(struct file *, loff_t *, |
Andrew Morton | 88e6fae | 2006-04-11 13:59:36 +0200 | [diff] [blame] | 2209 | struct pipe_inode_info *, size_t, unsigned int); |
| 2210 | extern ssize_t generic_file_splice_write(struct pipe_inode_info *, |
Jens Axboe | cbb7e57 | 2006-04-11 14:57:50 +0200 | [diff] [blame] | 2211 | struct file *, loff_t *, size_t, unsigned int); |
Andrew Morton | 88e6fae | 2006-04-11 13:59:36 +0200 | [diff] [blame] | 2212 | extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe, |
Jens Axboe | cbb7e57 | 2006-04-11 14:57:50 +0200 | [diff] [blame] | 2213 | struct file *out, loff_t *, size_t len, unsigned int flags); |
| 2214 | extern long do_splice_direct(struct file *in, loff_t *ppos, struct file *out, |
Andrew Morton | 88e6fae | 2006-04-11 13:59:36 +0200 | [diff] [blame] | 2215 | size_t len, unsigned int flags); |
| 2216 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2217 | extern void |
| 2218 | file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2219 | extern loff_t no_llseek(struct file *file, loff_t offset, int origin); |
| 2220 | extern loff_t generic_file_llseek(struct file *file, loff_t offset, int origin); |
Andi Kleen | 9465efc | 2008-06-27 11:05:24 +0200 | [diff] [blame] | 2221 | extern loff_t generic_file_llseek_unlocked(struct file *file, loff_t offset, |
| 2222 | int origin); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2223 | extern int generic_file_open(struct inode * inode, struct file * filp); |
| 2224 | extern int nonseekable_open(struct inode * inode, struct file * filp); |
| 2225 | |
Carsten Otte | ceffc07 | 2005-06-23 22:05:25 -0700 | [diff] [blame] | 2226 | #ifdef CONFIG_FS_XIP |
Carsten Otte | eb6fe0c | 2005-06-23 22:05:28 -0700 | [diff] [blame] | 2227 | extern ssize_t xip_file_read(struct file *filp, char __user *buf, size_t len, |
| 2228 | loff_t *ppos); |
Carsten Otte | ceffc07 | 2005-06-23 22:05:25 -0700 | [diff] [blame] | 2229 | extern int xip_file_mmap(struct file * file, struct vm_area_struct * vma); |
Carsten Otte | eb6fe0c | 2005-06-23 22:05:28 -0700 | [diff] [blame] | 2230 | extern ssize_t xip_file_write(struct file *filp, const char __user *buf, |
| 2231 | size_t len, loff_t *ppos); |
Carsten Otte | ceffc07 | 2005-06-23 22:05:25 -0700 | [diff] [blame] | 2232 | extern int xip_truncate_page(struct address_space *mapping, loff_t from); |
Carsten Otte | 6d79125 | 2005-06-23 22:05:26 -0700 | [diff] [blame] | 2233 | #else |
| 2234 | static inline int xip_truncate_page(struct address_space *mapping, loff_t from) |
| 2235 | { |
| 2236 | return 0; |
| 2237 | } |
Carsten Otte | ceffc07 | 2005-06-23 22:05:25 -0700 | [diff] [blame] | 2238 | #endif |
| 2239 | |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2240 | #ifdef CONFIG_BLOCK |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2241 | ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode, |
| 2242 | struct block_device *bdev, const struct iovec *iov, loff_t offset, |
Badari Pulavarty | 1d8fa7a | 2006-03-26 01:38:02 -0800 | [diff] [blame] | 2243 | unsigned long nr_segs, get_block_t get_block, dio_iodone_t end_io, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2244 | int lock_type); |
| 2245 | |
| 2246 | enum { |
| 2247 | DIO_LOCKING = 1, /* need locking between buffered and direct access */ |
| 2248 | DIO_NO_LOCKING, /* bdev; no locking at all between buffered/direct */ |
| 2249 | DIO_OWN_LOCKING, /* filesystem locks buffered and direct internally */ |
| 2250 | }; |
| 2251 | |
| 2252 | static inline ssize_t blockdev_direct_IO(int rw, struct kiocb *iocb, |
| 2253 | struct inode *inode, struct block_device *bdev, const struct iovec *iov, |
Badari Pulavarty | 1d8fa7a | 2006-03-26 01:38:02 -0800 | [diff] [blame] | 2254 | loff_t offset, unsigned long nr_segs, get_block_t get_block, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2255 | dio_iodone_t end_io) |
| 2256 | { |
| 2257 | return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset, |
Badari Pulavarty | 1d8fa7a | 2006-03-26 01:38:02 -0800 | [diff] [blame] | 2258 | nr_segs, get_block, end_io, DIO_LOCKING); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2259 | } |
| 2260 | |
| 2261 | static inline ssize_t blockdev_direct_IO_no_locking(int rw, struct kiocb *iocb, |
| 2262 | struct inode *inode, struct block_device *bdev, const struct iovec *iov, |
Badari Pulavarty | 1d8fa7a | 2006-03-26 01:38:02 -0800 | [diff] [blame] | 2263 | loff_t offset, unsigned long nr_segs, get_block_t get_block, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2264 | dio_iodone_t end_io) |
| 2265 | { |
| 2266 | return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset, |
Badari Pulavarty | 1d8fa7a | 2006-03-26 01:38:02 -0800 | [diff] [blame] | 2267 | nr_segs, get_block, end_io, DIO_NO_LOCKING); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2268 | } |
| 2269 | |
| 2270 | static inline ssize_t blockdev_direct_IO_own_locking(int rw, struct kiocb *iocb, |
| 2271 | struct inode *inode, struct block_device *bdev, const struct iovec *iov, |
Badari Pulavarty | 1d8fa7a | 2006-03-26 01:38:02 -0800 | [diff] [blame] | 2272 | loff_t offset, unsigned long nr_segs, get_block_t get_block, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2273 | dio_iodone_t end_io) |
| 2274 | { |
| 2275 | return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset, |
Badari Pulavarty | 1d8fa7a | 2006-03-26 01:38:02 -0800 | [diff] [blame] | 2276 | nr_segs, get_block, end_io, DIO_OWN_LOCKING); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2277 | } |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2278 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2279 | |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 2280 | extern const struct file_operations generic_ro_fops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2281 | |
| 2282 | #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m)) |
| 2283 | |
| 2284 | extern int vfs_readlink(struct dentry *, char __user *, int, const char *); |
| 2285 | extern int vfs_follow_link(struct nameidata *, const char *); |
| 2286 | extern int page_readlink(struct dentry *, char __user *, int); |
Linus Torvalds | cc314ee | 2005-08-19 18:02:56 -0700 | [diff] [blame] | 2287 | extern void *page_follow_link_light(struct dentry *, struct nameidata *); |
| 2288 | extern void page_put_link(struct dentry *, struct nameidata *, void *); |
Kirill Korotaev | 0adb25d | 2006-03-11 03:27:13 -0800 | [diff] [blame] | 2289 | extern int __page_symlink(struct inode *inode, const char *symname, int len, |
Nick Piggin | 54566b2 | 2009-01-04 12:00:53 -0800 | [diff] [blame] | 2290 | int nofs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2291 | extern int page_symlink(struct inode *inode, const char *symname, int len); |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 2292 | extern const struct inode_operations page_symlink_inode_operations; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2293 | extern int generic_readlink(struct dentry *, char __user *, int); |
| 2294 | extern void generic_fillattr(struct inode *, struct kstat *); |
| 2295 | extern int vfs_getattr(struct vfsmount *, struct dentry *, struct kstat *); |
| 2296 | void inode_add_bytes(struct inode *inode, loff_t bytes); |
| 2297 | void inode_sub_bytes(struct inode *inode, loff_t bytes); |
| 2298 | loff_t inode_get_bytes(struct inode *inode); |
| 2299 | void inode_set_bytes(struct inode *inode, loff_t bytes); |
| 2300 | |
| 2301 | extern int vfs_readdir(struct file *, filldir_t, void *); |
| 2302 | |
| 2303 | extern int vfs_stat(char __user *, struct kstat *); |
| 2304 | extern int vfs_lstat(char __user *, struct kstat *); |
Ulrich Drepper | 5590ff0 | 2006-01-18 17:43:53 -0800 | [diff] [blame] | 2305 | extern int vfs_stat_fd(int dfd, char __user *, struct kstat *); |
| 2306 | extern int vfs_lstat_fd(int dfd, char __user *, struct kstat *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2307 | extern int vfs_fstat(unsigned int, struct kstat *); |
| 2308 | |
Erez Zadok | deb21db | 2008-02-07 00:13:25 -0800 | [diff] [blame] | 2309 | extern int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd, |
| 2310 | unsigned long arg); |
Steven Whitehouse | e9079cc | 2008-10-14 14:43:29 +0100 | [diff] [blame] | 2311 | extern int __generic_block_fiemap(struct inode *inode, |
| 2312 | struct fiemap_extent_info *fieinfo, u64 start, |
| 2313 | u64 len, get_block_t *get_block); |
Josef Bacik | 68c9d70 | 2008-10-03 17:32:43 -0400 | [diff] [blame] | 2314 | extern int generic_block_fiemap(struct inode *inode, |
| 2315 | struct fiemap_extent_info *fieinfo, u64 start, |
| 2316 | u64 len, get_block_t *get_block); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2317 | |
Miklos Szeredi | c18479f | 2007-10-18 23:39:11 -0700 | [diff] [blame] | 2318 | extern void get_filesystem(struct file_system_type *fs); |
| 2319 | extern void put_filesystem(struct file_system_type *fs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2320 | extern struct file_system_type *get_fs_type(const char *name); |
| 2321 | extern struct super_block *get_super(struct block_device *); |
| 2322 | extern struct super_block *user_get_super(dev_t); |
| 2323 | extern void drop_super(struct super_block *sb); |
| 2324 | |
| 2325 | extern int dcache_dir_open(struct inode *, struct file *); |
| 2326 | extern int dcache_dir_close(struct inode *, struct file *); |
| 2327 | extern loff_t dcache_dir_lseek(struct file *, loff_t, int); |
| 2328 | extern int dcache_readdir(struct file *, void *, filldir_t); |
| 2329 | extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *); |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 2330 | extern int simple_statfs(struct dentry *, struct kstatfs *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2331 | extern int simple_link(struct dentry *, struct inode *, struct dentry *); |
| 2332 | extern int simple_unlink(struct inode *, struct dentry *); |
| 2333 | extern int simple_rmdir(struct inode *, struct dentry *); |
| 2334 | extern int simple_rename(struct inode *, struct dentry *, struct inode *, struct dentry *); |
| 2335 | extern int simple_sync_file(struct file *, struct dentry *, int); |
| 2336 | extern int simple_empty(struct dentry *); |
| 2337 | extern int simple_readpage(struct file *file, struct page *page); |
| 2338 | extern int simple_prepare_write(struct file *file, struct page *page, |
| 2339 | unsigned offset, unsigned to); |
Nick Piggin | afddba4 | 2007-10-16 01:25:01 -0700 | [diff] [blame] | 2340 | extern int simple_write_begin(struct file *file, struct address_space *mapping, |
| 2341 | loff_t pos, unsigned len, unsigned flags, |
| 2342 | struct page **pagep, void **fsdata); |
| 2343 | extern int simple_write_end(struct file *file, struct address_space *mapping, |
| 2344 | loff_t pos, unsigned len, unsigned copied, |
| 2345 | struct page *page, void *fsdata); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2346 | |
| 2347 | extern struct dentry *simple_lookup(struct inode *, struct dentry *, struct nameidata *); |
| 2348 | extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *); |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 2349 | extern const struct file_operations simple_dir_operations; |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 2350 | extern const struct inode_operations simple_dir_inode_operations; |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 2351 | struct tree_descr { char *name; const struct file_operations *ops; int mode; }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2352 | struct dentry *d_alloc_name(struct dentry *, const char *); |
| 2353 | extern int simple_fill_super(struct super_block *, int, struct tree_descr *); |
Trond Myklebust | 1f5ce9e | 2006-06-09 09:34:16 -0400 | [diff] [blame] | 2354 | extern int simple_pin_fs(struct file_system_type *, struct vfsmount **mount, int *count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2355 | extern void simple_release_fs(struct vfsmount **mount, int *count); |
| 2356 | |
Akinobu Mita | 93b0711 | 2008-06-05 22:46:21 -0700 | [diff] [blame] | 2357 | extern ssize_t simple_read_from_buffer(void __user *to, size_t count, |
| 2358 | loff_t *ppos, const void *from, size_t available); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2359 | |
Christoph Lameter | e965f96 | 2006-02-01 03:05:41 -0800 | [diff] [blame] | 2360 | #ifdef CONFIG_MIGRATION |
Christoph Lameter | 2d1db3b | 2006-06-23 02:03:33 -0700 | [diff] [blame] | 2361 | extern int buffer_migrate_page(struct address_space *, |
| 2362 | struct page *, struct page *); |
Christoph Lameter | e965f96 | 2006-02-01 03:05:41 -0800 | [diff] [blame] | 2363 | #else |
| 2364 | #define buffer_migrate_page NULL |
| 2365 | #endif |
| 2366 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2367 | extern int inode_change_ok(struct inode *, struct iattr *); |
| 2368 | extern int __must_check inode_setattr(struct inode *, struct iattr *); |
| 2369 | |
Christoph Hellwig | 870f481 | 2006-01-09 20:52:01 -0800 | [diff] [blame] | 2370 | extern void file_update_time(struct file *file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2371 | |
Miklos Szeredi | b3b304a | 2008-02-08 04:21:35 -0800 | [diff] [blame] | 2372 | extern int generic_show_options(struct seq_file *m, struct vfsmount *mnt); |
| 2373 | extern void save_mount_options(struct super_block *sb, char *options); |
| 2374 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2375 | static inline ino_t parent_ino(struct dentry *dentry) |
| 2376 | { |
| 2377 | ino_t res; |
| 2378 | |
| 2379 | spin_lock(&dentry->d_lock); |
| 2380 | res = dentry->d_parent->d_inode->i_ino; |
| 2381 | spin_unlock(&dentry->d_lock); |
| 2382 | return res; |
| 2383 | } |
| 2384 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2385 | /* Transaction based IO helpers */ |
| 2386 | |
| 2387 | /* |
| 2388 | * An argresp is stored in an allocated page and holds the |
| 2389 | * size of the argument or response, along with its content |
| 2390 | */ |
| 2391 | struct simple_transaction_argresp { |
| 2392 | ssize_t size; |
| 2393 | char data[0]; |
| 2394 | }; |
| 2395 | |
| 2396 | #define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp)) |
| 2397 | |
| 2398 | char *simple_transaction_get(struct file *file, const char __user *buf, |
| 2399 | size_t size); |
| 2400 | ssize_t simple_transaction_read(struct file *file, char __user *buf, |
| 2401 | size_t size, loff_t *pos); |
| 2402 | int simple_transaction_release(struct inode *inode, struct file *file); |
| 2403 | |
Ingo Molnar | 76791ab | 2009-03-25 16:48:35 +0100 | [diff] [blame] | 2404 | void simple_transaction_set(struct file *file, size_t n); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2405 | |
Arnd Bergmann | acaefc2 | 2005-05-18 14:40:59 +0200 | [diff] [blame] | 2406 | /* |
| 2407 | * simple attribute files |
| 2408 | * |
| 2409 | * These attributes behave similar to those in sysfs: |
| 2410 | * |
| 2411 | * Writing to an attribute immediately sets a value, an open file can be |
| 2412 | * written to multiple times. |
| 2413 | * |
| 2414 | * Reading from an attribute creates a buffer from the value that might get |
| 2415 | * read with multiple read calls. When the attribute has been read |
| 2416 | * completely, no further read calls are possible until the file is opened |
| 2417 | * again. |
| 2418 | * |
| 2419 | * All attributes contain a text representation of a numeric value |
| 2420 | * that are accessed with the get() and set() functions. |
| 2421 | */ |
| 2422 | #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \ |
| 2423 | static int __fops ## _open(struct inode *inode, struct file *file) \ |
| 2424 | { \ |
| 2425 | __simple_attr_check_format(__fmt, 0ull); \ |
| 2426 | return simple_attr_open(inode, file, __get, __set, __fmt); \ |
| 2427 | } \ |
| 2428 | static struct file_operations __fops = { \ |
| 2429 | .owner = THIS_MODULE, \ |
| 2430 | .open = __fops ## _open, \ |
Christoph Hellwig | 74bedc4 | 2008-02-08 04:20:28 -0800 | [diff] [blame] | 2431 | .release = simple_attr_release, \ |
Arnd Bergmann | acaefc2 | 2005-05-18 14:40:59 +0200 | [diff] [blame] | 2432 | .read = simple_attr_read, \ |
| 2433 | .write = simple_attr_write, \ |
| 2434 | }; |
| 2435 | |
| 2436 | static inline void __attribute__((format(printf, 1, 2))) |
| 2437 | __simple_attr_check_format(const char *fmt, ...) |
| 2438 | { |
| 2439 | /* don't do anything, just let the compiler check the arguments; */ |
| 2440 | } |
| 2441 | |
| 2442 | int simple_attr_open(struct inode *inode, struct file *file, |
Christoph Hellwig | 8b88b09 | 2008-02-08 04:20:26 -0800 | [diff] [blame] | 2443 | int (*get)(void *, u64 *), int (*set)(void *, u64), |
Arnd Bergmann | acaefc2 | 2005-05-18 14:40:59 +0200 | [diff] [blame] | 2444 | const char *fmt); |
Christoph Hellwig | 74bedc4 | 2008-02-08 04:20:28 -0800 | [diff] [blame] | 2445 | int simple_attr_release(struct inode *inode, struct file *file); |
Arnd Bergmann | acaefc2 | 2005-05-18 14:40:59 +0200 | [diff] [blame] | 2446 | ssize_t simple_attr_read(struct file *file, char __user *buf, |
| 2447 | size_t len, loff_t *ppos); |
| 2448 | ssize_t simple_attr_write(struct file *file, const char __user *buf, |
| 2449 | size_t len, loff_t *ppos); |
| 2450 | |
Alexey Dobriyan | 4be2854 | 2007-10-16 23:26:21 -0700 | [diff] [blame] | 2451 | struct ctl_table; |
| 2452 | int proc_nr_files(struct ctl_table *table, int write, struct file *filp, |
Adrian Bunk | 62239ac | 2007-07-17 04:03:45 -0700 | [diff] [blame] | 2453 | void __user *buffer, size_t *lenp, loff_t *ppos); |
| 2454 | |
Adrian Bunk | 011e3fc | 2008-02-06 01:36:47 -0800 | [diff] [blame] | 2455 | int get_filesystem_list(char * buf); |
Adrian Bunk | 62239ac | 2007-07-17 04:03:45 -0700 | [diff] [blame] | 2456 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2457 | #endif /* __KERNEL__ */ |
| 2458 | #endif /* _LINUX_FS_H */ |