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> |
Tejun Heo | 7cc0158 | 2010-08-03 13:14:58 +0200 | [diff] [blame] | 11 | #include <linux/blk_types.h> |
Ingo Molnar | b31d42a | 2010-10-28 16:39:24 +0200 | [diff] [blame] | 12 | #include <linux/types.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | |
| 14 | /* |
| 15 | * It's silly to have NR_OPEN bigger than NR_FILE, but you can change |
| 16 | * the file limit at runtime and only root can increase the per-process |
| 17 | * nr_file rlimit, so it's safe to set up a ridiculously high absolute |
| 18 | * upper limit on files-per-process. |
| 19 | * |
| 20 | * Some programs (notably those using select()) may have to be |
| 21 | * recompiled to take full advantage of the new limits.. |
| 22 | */ |
| 23 | |
| 24 | /* Fixed constants first: */ |
| 25 | #undef NR_OPEN |
Tim Gardner | 0ac1ee0 | 2011-05-24 17:13:05 -0700 | [diff] [blame] | 26 | #define INR_OPEN_CUR 1024 /* Initial setting for nfile rlimits */ |
| 27 | #define INR_OPEN_MAX 4096 /* Hard limit for nfile rlimits */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | |
| 29 | #define BLOCK_SIZE_BITS 10 |
| 30 | #define BLOCK_SIZE (1<<BLOCK_SIZE_BITS) |
| 31 | |
David Howells | 01bf466 | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 32 | #define SEEK_SET 0 /* seek relative to beginning of file */ |
| 33 | #define SEEK_CUR 1 /* seek relative to current file position */ |
| 34 | #define SEEK_END 2 /* seek relative to end of file */ |
Chris Snook | 1ae7075 | 2007-05-08 00:24:15 -0700 | [diff] [blame] | 35 | #define SEEK_MAX SEEK_END |
David Howells | 01bf466 | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 36 | |
Lukas Czerner | 367a51a3 | 2010-10-27 21:30:11 -0400 | [diff] [blame] | 37 | struct fstrim_range { |
Loïc Minier | 3a3a1af | 2010-11-24 12:56:53 -0800 | [diff] [blame] | 38 | __u64 start; |
| 39 | __u64 len; |
| 40 | __u64 minlen; |
Lukas Czerner | 367a51a3 | 2010-10-27 21:30:11 -0400 | [diff] [blame] | 41 | }; |
| 42 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | /* And dynamically-tunable limits and defaults: */ |
| 44 | struct files_stat_struct { |
Eric Dumazet | 518de9b | 2010-10-26 14:22:44 -0700 | [diff] [blame] | 45 | unsigned long nr_files; /* read only */ |
| 46 | unsigned long nr_free_files; /* read only */ |
| 47 | unsigned long max_files; /* tunable */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | |
| 50 | struct inodes_stat_t { |
| 51 | int nr_inodes; |
| 52 | int nr_unused; |
Stefan Richter | 9e7bf24 | 2007-07-15 23:40:25 -0700 | [diff] [blame] | 53 | int dummy[5]; /* padding for sysctl ABI compatibility */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | |
| 57 | #define NR_FILE 8192 /* this can well be larger on a larger system */ |
| 58 | |
| 59 | #define MAY_EXEC 1 |
| 60 | #define MAY_WRITE 2 |
| 61 | #define MAY_READ 4 |
| 62 | #define MAY_APPEND 8 |
Al Viro | e6305c4 | 2008-07-15 21:03:57 -0400 | [diff] [blame] | 63 | #define MAY_ACCESS 16 |
Al Viro | a110343 | 2008-07-17 09:19:08 -0400 | [diff] [blame] | 64 | #define MAY_OPEN 32 |
Eric Paris | 9cfcac8 | 2010-07-23 11:43:51 -0400 | [diff] [blame] | 65 | #define MAY_CHDIR 64 |
Al Viro | 1fc0f78 | 2011-06-20 18:59:02 -0400 | [diff] [blame] | 66 | #define MAY_NOT_BLOCK 128 /* called from RCU mode, don't block */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | |
Paul Turner | 55ec821 | 2009-02-18 14:48:15 -0800 | [diff] [blame] | 68 | /* |
| 69 | * flags in file.f_mode. Note that FMODE_READ and FMODE_WRITE must correspond |
| 70 | * to O_WRONLY and O_RDWR via the strange trick in __dentry_open() |
| 71 | */ |
| 72 | |
Christoph Hellwig | fc9161e | 2008-11-05 14:58:46 +0100 | [diff] [blame] | 73 | /* file is open for reading */ |
Andrew Morton | 19adf9c | 2010-03-05 13:42:03 -0800 | [diff] [blame] | 74 | #define FMODE_READ ((__force fmode_t)0x1) |
Christoph Hellwig | fc9161e | 2008-11-05 14:58:46 +0100 | [diff] [blame] | 75 | /* file is open for writing */ |
Andrew Morton | 19adf9c | 2010-03-05 13:42:03 -0800 | [diff] [blame] | 76 | #define FMODE_WRITE ((__force fmode_t)0x2) |
Christoph Hellwig | fc9161e | 2008-11-05 14:58:46 +0100 | [diff] [blame] | 77 | /* file is seekable */ |
Andrew Morton | 19adf9c | 2010-03-05 13:42:03 -0800 | [diff] [blame] | 78 | #define FMODE_LSEEK ((__force fmode_t)0x4) |
Paul Turner | 55ec821 | 2009-02-18 14:48:15 -0800 | [diff] [blame] | 79 | /* file can be accessed using pread */ |
Andrew Morton | 19adf9c | 2010-03-05 13:42:03 -0800 | [diff] [blame] | 80 | #define FMODE_PREAD ((__force fmode_t)0x8) |
Paul Turner | 55ec821 | 2009-02-18 14:48:15 -0800 | [diff] [blame] | 81 | /* file can be accessed using pwrite */ |
Andrew Morton | 19adf9c | 2010-03-05 13:42:03 -0800 | [diff] [blame] | 82 | #define FMODE_PWRITE ((__force fmode_t)0x10) |
Christoph Hellwig | fc9161e | 2008-11-05 14:58:46 +0100 | [diff] [blame] | 83 | /* File is opened for execution with sys_execve / sys_uselib */ |
Andrew Morton | 19adf9c | 2010-03-05 13:42:03 -0800 | [diff] [blame] | 84 | #define FMODE_EXEC ((__force fmode_t)0x20) |
Christoph Hellwig | fc9161e | 2008-11-05 14:58:46 +0100 | [diff] [blame] | 85 | /* File is opened with O_NDELAY (only set for block devices) */ |
Andrew Morton | 19adf9c | 2010-03-05 13:42:03 -0800 | [diff] [blame] | 86 | #define FMODE_NDELAY ((__force fmode_t)0x40) |
Christoph Hellwig | fc9161e | 2008-11-05 14:58:46 +0100 | [diff] [blame] | 87 | /* File is opened with O_EXCL (only set for block devices) */ |
Andrew Morton | 19adf9c | 2010-03-05 13:42:03 -0800 | [diff] [blame] | 88 | #define FMODE_EXCL ((__force fmode_t)0x80) |
Christoph Hellwig | fc9161e | 2008-11-05 14:58:46 +0100 | [diff] [blame] | 89 | /* File is opened using open(.., 3, ..) and is writeable only for ioctls |
| 90 | (specialy hack for floppy.c) */ |
Andrew Morton | 19adf9c | 2010-03-05 13:42:03 -0800 | [diff] [blame] | 91 | #define FMODE_WRITE_IOCTL ((__force fmode_t)0x100) |
Oleg Drokin | b500531 | 2006-03-25 03:07:01 -0800 | [diff] [blame] | 92 | |
Christoph Hellwig | 4d4be48 | 2008-12-09 04:47:33 -0500 | [diff] [blame] | 93 | /* |
| 94 | * Don't update ctime and mtime. |
| 95 | * |
| 96 | * Currently a special hack for the XFS open_by_handle ioctl, but we'll |
| 97 | * hopefully graduate it to a proper O_CMTIME flag supported by open(2) soon. |
| 98 | */ |
Andrew Morton | 19adf9c | 2010-03-05 13:42:03 -0800 | [diff] [blame] | 99 | #define FMODE_NOCMTIME ((__force fmode_t)0x800) |
Christoph Hellwig | 4d4be48 | 2008-12-09 04:47:33 -0500 | [diff] [blame] | 100 | |
Wu Fengguang | 0141450 | 2010-03-05 13:42:03 -0800 | [diff] [blame] | 101 | /* Expect random access pattern */ |
Andrew Morton | 19adf9c | 2010-03-05 13:42:03 -0800 | [diff] [blame] | 102 | #define FMODE_RANDOM ((__force fmode_t)0x1000) |
Wu Fengguang | 0141450 | 2010-03-05 13:42:03 -0800 | [diff] [blame] | 103 | |
KAMEZAWA Hiroyuki | 4a3956c | 2010-10-01 14:20:22 -0700 | [diff] [blame] | 104 | /* File is huge (eg. /dev/kmem): treat loff_t as unsigned */ |
| 105 | #define FMODE_UNSIGNED_OFFSET ((__force fmode_t)0x2000) |
| 106 | |
Al Viro | 1abf0c7 | 2011-03-13 03:51:11 -0400 | [diff] [blame] | 107 | /* File is opened with O_PATH; almost nothing can be done with it */ |
| 108 | #define FMODE_PATH ((__force fmode_t)0x4000) |
| 109 | |
Eric Paris | ecf081d | 2009-12-17 21:24:25 -0500 | [diff] [blame] | 110 | /* File was opened by fanotify and shouldn't generate fanotify events */ |
Andrew Morton | 13bcbc0 | 2010-08-10 18:01:09 -0700 | [diff] [blame] | 111 | #define FMODE_NONOTIFY ((__force fmode_t)0x1000000) |
Eric Paris | ecf081d | 2009-12-17 21:24:25 -0500 | [diff] [blame] | 112 | |
Jens Axboe | 48e70bc | 2009-04-14 08:19:27 +0200 | [diff] [blame] | 113 | /* |
| 114 | * The below are the various read and write types that we support. Some of |
| 115 | * them include behavioral modifiers that send information down to the |
| 116 | * block layer and IO scheduler. Terminology: |
| 117 | * |
| 118 | * The block layer uses device plugging to defer IO a little bit, in |
| 119 | * the hope that we will see more IO very shortly. This increases |
| 120 | * coalescing of adjacent IO and thus reduces the number of IOs we |
| 121 | * have to send to the device. It also allows for better queuing, |
| 122 | * if the IO isn't mergeable. If the caller is going to be waiting |
| 123 | * for the IO, then he must ensure that the device is unplugged so |
| 124 | * that the IO is dispatched to the driver. |
| 125 | * |
| 126 | * All IO is handled async in Linux. This is fine for background |
| 127 | * writes, but for reads or writes that someone waits for completion |
| 128 | * on, we want to notify the block layer and IO scheduler so that they |
| 129 | * know about it. That allows them to make better scheduling |
| 130 | * decisions. So when the below references 'sync' and 'async', it |
| 131 | * is referencing this priority hint. |
| 132 | * |
| 133 | * With that in mind, the available types are: |
| 134 | * |
| 135 | * READ A normal read operation. Device will be plugged. |
| 136 | * READ_SYNC A synchronous read. Device is not plugged, caller can |
| 137 | * immediately wait on this read without caring about |
| 138 | * unplugging. |
| 139 | * READA Used for read-ahead operations. Lower priority, and the |
Tejun Heo | 7cc0158 | 2010-08-03 13:14:58 +0200 | [diff] [blame] | 140 | * block layer could (in theory) choose to ignore this |
Jens Axboe | 48e70bc | 2009-04-14 08:19:27 +0200 | [diff] [blame] | 141 | * request if it runs into resource problems. |
| 142 | * WRITE A normal async write. Device will be plugged. |
Jens Axboe | 721a960 | 2011-03-09 11:56:30 +0100 | [diff] [blame] | 143 | * WRITE_SYNC Synchronous write. Identical to WRITE, but passes down |
Jens Axboe | 48e70bc | 2009-04-14 08:19:27 +0200 | [diff] [blame] | 144 | * the hint that someone will be waiting on this IO |
Jens Axboe | 721a960 | 2011-03-09 11:56:30 +0100 | [diff] [blame] | 145 | * shortly. The write equivalent of READ_SYNC. |
| 146 | * WRITE_ODIRECT Special case write for O_DIRECT only. |
Tejun Heo | 4fed947 | 2010-09-03 11:56:17 +0200 | [diff] [blame] | 147 | * WRITE_FLUSH Like WRITE_SYNC but with preceding cache flush. |
| 148 | * WRITE_FUA Like WRITE_SYNC but data is guaranteed to be on |
| 149 | * non-volatile media on completion. |
| 150 | * WRITE_FLUSH_FUA Combination of WRITE_FLUSH and FUA. The IO is preceded |
| 151 | * by a cache flush and data is guaranteed to be on |
| 152 | * non-volatile media on completion. |
Jens Axboe | 48e70bc | 2009-04-14 08:19:27 +0200 | [diff] [blame] | 153 | * |
| 154 | */ |
Tejun Heo | 7cc0158 | 2010-08-03 13:14:58 +0200 | [diff] [blame] | 155 | #define RW_MASK REQ_WRITE |
| 156 | #define RWA_MASK REQ_RAHEAD |
Christoph Hellwig | 7b6d91d | 2010-08-07 18:20:39 +0200 | [diff] [blame] | 157 | |
| 158 | #define READ 0 |
Tejun Heo | 7cc0158 | 2010-08-03 13:14:58 +0200 | [diff] [blame] | 159 | #define WRITE RW_MASK |
| 160 | #define READA RWA_MASK |
Christoph Hellwig | 7b6d91d | 2010-08-07 18:20:39 +0200 | [diff] [blame] | 161 | |
Jens Axboe | 721a960 | 2011-03-09 11:56:30 +0100 | [diff] [blame] | 162 | #define READ_SYNC (READ | REQ_SYNC) |
Christoph Hellwig | 7b6d91d | 2010-08-07 18:20:39 +0200 | [diff] [blame] | 163 | #define READ_META (READ | REQ_META) |
Jens Axboe | 721a960 | 2011-03-09 11:56:30 +0100 | [diff] [blame] | 164 | #define WRITE_SYNC (WRITE | REQ_SYNC | REQ_NOIDLE) |
| 165 | #define WRITE_ODIRECT (WRITE | REQ_SYNC) |
Christoph Hellwig | 7b6d91d | 2010-08-07 18:20:39 +0200 | [diff] [blame] | 166 | #define WRITE_META (WRITE | REQ_META) |
Jens Axboe | 721a960 | 2011-03-09 11:56:30 +0100 | [diff] [blame] | 167 | #define WRITE_FLUSH (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH) |
| 168 | #define WRITE_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FUA) |
| 169 | #define WRITE_FLUSH_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH | REQ_FUA) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | |
| 171 | #define SEL_IN 1 |
| 172 | #define SEL_OUT 2 |
| 173 | #define SEL_EX 4 |
| 174 | |
| 175 | /* public flags for file_system_type */ |
| 176 | #define FS_REQUIRES_DEV 1 |
| 177 | #define FS_BINARY_MOUNTDATA 2 |
Miklos Szeredi | 79c0b2d | 2007-05-08 00:25:43 -0700 | [diff] [blame] | 178 | #define FS_HAS_SUBTYPE 4 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | #define FS_REVAL_DOT 16384 /* Check the paths ".", ".." for staleness */ |
Mark Fasheh | 349457c | 2006-09-08 14:22:21 -0700 | [diff] [blame] | 180 | #define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move() |
| 181 | * during rename() internally. |
| 182 | */ |
| 183 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | /* |
| 185 | * These are the fs-independent mount-flags: up to 32 flags are supported |
| 186 | */ |
| 187 | #define MS_RDONLY 1 /* Mount read-only */ |
| 188 | #define MS_NOSUID 2 /* Ignore suid and sgid bits */ |
| 189 | #define MS_NODEV 4 /* Disallow access to device special files */ |
| 190 | #define MS_NOEXEC 8 /* Disallow program execution */ |
| 191 | #define MS_SYNCHRONOUS 16 /* Writes are synced at once */ |
| 192 | #define MS_REMOUNT 32 /* Alter flags of a mounted FS */ |
| 193 | #define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */ |
| 194 | #define MS_DIRSYNC 128 /* Directory modifications are synchronous */ |
| 195 | #define MS_NOATIME 1024 /* Do not update access times. */ |
| 196 | #define MS_NODIRATIME 2048 /* Do not update directory access times */ |
| 197 | #define MS_BIND 4096 |
| 198 | #define MS_MOVE 8192 |
| 199 | #define MS_REC 16384 |
Theodore Ts'o | 9b04c99 | 2006-03-24 03:15:10 -0800 | [diff] [blame] | 200 | #define MS_VERBOSE 32768 /* War is peace. Verbosity is silence. |
| 201 | MS_VERBOSE is deprecated. */ |
| 202 | #define MS_SILENT 32768 |
Miklos Szeredi | bf066c7 | 2006-01-08 01:03:19 -0800 | [diff] [blame] | 203 | #define MS_POSIXACL (1<<16) /* VFS does not apply the umask */ |
Ram Pai | 9676f0c | 2005-11-07 17:21:20 -0500 | [diff] [blame] | 204 | #define MS_UNBINDABLE (1<<17) /* change to unbindable */ |
Ram Pai | 07b2088 | 2005-11-07 17:19:07 -0500 | [diff] [blame] | 205 | #define MS_PRIVATE (1<<18) /* change to private */ |
Ram Pai | a58b0eb | 2005-11-07 17:20:48 -0500 | [diff] [blame] | 206 | #define MS_SLAVE (1<<19) /* change to slave */ |
Ram Pai | 03e06e6 | 2005-11-07 17:19:33 -0500 | [diff] [blame] | 207 | #define MS_SHARED (1<<20) /* change to shared */ |
Valerie Henson | 47ae32d | 2006-12-13 00:34:34 -0800 | [diff] [blame] | 208 | #define MS_RELATIME (1<<21) /* Update atime relative to mtime/ctime. */ |
Pavel Emelyanov | 8bf9725 | 2007-10-18 23:40:02 -0700 | [diff] [blame] | 209 | #define MS_KERNMOUNT (1<<22) /* this is a kern_mount call */ |
Jean Noel Cordenner | 7a22422 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 210 | #define MS_I_VERSION (1<<23) /* Update inode I_version field */ |
Matthew Garrett | d0adde5 | 2009-03-26 17:49:56 +0000 | [diff] [blame] | 211 | #define MS_STRICTATIME (1<<24) /* Always perform atime updates */ |
Al Viro | 9e1f1de | 2011-06-03 18:24:58 -0400 | [diff] [blame] | 212 | #define MS_NOSEC (1<<28) |
Al Viro | 7a4dec5 | 2010-08-09 12:05:43 -0400 | [diff] [blame] | 213 | #define MS_BORN (1<<29) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | #define MS_ACTIVE (1<<30) |
| 215 | #define MS_NOUSER (1<<31) |
| 216 | |
| 217 | /* |
| 218 | * Superblock flags that can be altered by MS_REMOUNT |
| 219 | */ |
Mimi Zohar | 08b9fe6 | 2008-10-13 00:09:50 -0400 | [diff] [blame] | 220 | #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] | 221 | |
| 222 | /* |
| 223 | * Old magic mount flag and mask |
| 224 | */ |
| 225 | #define MS_MGC_VAL 0xC0ED0000 |
| 226 | #define MS_MGC_MSK 0xffff0000 |
| 227 | |
| 228 | /* Inode flags - they have nothing to superblock flags now */ |
| 229 | |
| 230 | #define S_SYNC 1 /* Writes are synced at once */ |
| 231 | #define S_NOATIME 2 /* Do not update access times */ |
| 232 | #define S_APPEND 4 /* Append-only file */ |
| 233 | #define S_IMMUTABLE 8 /* Immutable file */ |
| 234 | #define S_DEAD 16 /* removed, but still open directory */ |
| 235 | #define S_NOQUOTA 32 /* Inode is not counted to quota */ |
| 236 | #define S_DIRSYNC 64 /* Directory modifications are synchronous */ |
| 237 | #define S_NOCMTIME 128 /* Do not update file c/mtime */ |
| 238 | #define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */ |
| 239 | #define S_PRIVATE 512 /* Inode is fs-internal */ |
Eric Paris | 196f518 | 2010-10-25 14:42:19 -0400 | [diff] [blame] | 240 | #define S_IMA 1024 /* Inode has an associated IMA struct */ |
David Howells | 9875cf8 | 2011-01-14 18:45:21 +0000 | [diff] [blame] | 241 | #define S_AUTOMOUNT 2048 /* Automount/referral quasi-directory */ |
Andi Kleen | 69b4573 | 2011-05-28 08:25:51 -0700 | [diff] [blame] | 242 | #define S_NOSEC 4096 /* no suid or xattr security attributes */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | |
| 244 | /* |
| 245 | * Note that nosuid etc flags are inode-specific: setting some file-system |
| 246 | * flags just means all the inodes inherit those flags by default. It might be |
| 247 | * possible to override it selectively if you really wanted to with some |
| 248 | * ioctl() that is not currently implemented. |
| 249 | * |
| 250 | * Exception: MS_RDONLY is always applied to the entire file system. |
| 251 | * |
| 252 | * Unfortunately, it is possible to change a filesystems flags with it mounted |
| 253 | * with files in use. This means that all of the inodes will not have their |
| 254 | * i_flags updated. Hence, i_flags no longer inherit the superblock mount |
| 255 | * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org |
| 256 | */ |
| 257 | #define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg)) |
| 258 | |
| 259 | #define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY) |
| 260 | #define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \ |
| 261 | ((inode)->i_flags & S_SYNC)) |
| 262 | #define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \ |
| 263 | ((inode)->i_flags & (S_SYNC|S_DIRSYNC))) |
| 264 | #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK) |
Eric Dumazet | 37756ce | 2007-02-10 01:44:49 -0800 | [diff] [blame] | 265 | #define IS_NOATIME(inode) __IS_FLG(inode, MS_RDONLY|MS_NOATIME) |
Jean Noel Cordenner | 7a22422 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 266 | #define IS_I_VERSION(inode) __IS_FLG(inode, MS_I_VERSION) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | |
| 268 | #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA) |
| 269 | #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND) |
| 270 | #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | #define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL) |
| 272 | |
| 273 | #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD) |
| 274 | #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME) |
| 275 | #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE) |
| 276 | #define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE) |
Eric Paris | 196f518 | 2010-10-25 14:42:19 -0400 | [diff] [blame] | 277 | #define IS_IMA(inode) ((inode)->i_flags & S_IMA) |
David Howells | 9875cf8 | 2011-01-14 18:45:21 +0000 | [diff] [blame] | 278 | #define IS_AUTOMOUNT(inode) ((inode)->i_flags & S_AUTOMOUNT) |
Andi Kleen | 69b4573 | 2011-05-28 08:25:51 -0700 | [diff] [blame] | 279 | #define IS_NOSEC(inode) ((inode)->i_flags & S_NOSEC) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | |
| 281 | /* the read-only stuff doesn't really belong here, but any other place is |
| 282 | probably as bad and I don't want to create yet another include file. */ |
| 283 | |
| 284 | #define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */ |
| 285 | #define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */ |
| 286 | #define BLKRRPART _IO(0x12,95) /* re-read partition table */ |
| 287 | #define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */ |
| 288 | #define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */ |
| 289 | #define BLKRASET _IO(0x12,98) /* set read ahead for block device */ |
| 290 | #define BLKRAGET _IO(0x12,99) /* get current read ahead setting */ |
| 291 | #define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */ |
| 292 | #define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */ |
| 293 | #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */ |
| 294 | #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */ |
| 295 | #define BLKSSZGET _IO(0x12,104)/* get block device sector size */ |
| 296 | #if 0 |
| 297 | #define BLKPG _IO(0x12,105)/* See blkpg.h */ |
| 298 | |
| 299 | /* Some people are morons. Do not use sizeof! */ |
| 300 | |
| 301 | #define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */ |
| 302 | #define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */ |
| 303 | /* This was here just to show that the number is taken - |
| 304 | probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */ |
| 305 | #endif |
| 306 | /* A jump here: 108-111 have been used for various private purposes. */ |
| 307 | #define BLKBSZGET _IOR(0x12,112,size_t) |
| 308 | #define BLKBSZSET _IOW(0x12,113,size_t) |
| 309 | #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] | 310 | #define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup) |
| 311 | #define BLKTRACESTART _IO(0x12,116) |
| 312 | #define BLKTRACESTOP _IO(0x12,117) |
| 313 | #define BLKTRACETEARDOWN _IO(0x12,118) |
David Woodhouse | d30a260 | 2008-08-11 15:58:42 +0100 | [diff] [blame] | 314 | #define BLKDISCARD _IO(0x12,119) |
Martin K. Petersen | ac481c2 | 2009-10-03 20:52:01 +0200 | [diff] [blame] | 315 | #define BLKIOMIN _IO(0x12,120) |
| 316 | #define BLKIOOPT _IO(0x12,121) |
| 317 | #define BLKALIGNOFF _IO(0x12,122) |
| 318 | #define BLKPBSZGET _IO(0x12,123) |
Martin K. Petersen | 98262f2 | 2009-12-03 09:24:48 +0100 | [diff] [blame] | 319 | #define BLKDISCARDZEROES _IO(0x12,124) |
Adrian Hunter | 8d57a98 | 2010-08-11 14:17:49 -0700 | [diff] [blame] | 320 | #define BLKSECDISCARD _IO(0x12,125) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | |
| 322 | #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */ |
| 323 | #define FIBMAP _IO(0x00,1) /* bmap access */ |
| 324 | #define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */ |
Takashi Sato | fcccf50 | 2009-01-09 16:40:59 -0800 | [diff] [blame] | 325 | #define FIFREEZE _IOWR('X', 119, int) /* Freeze */ |
| 326 | #define FITHAW _IOWR('X', 120, int) /* Thaw */ |
Lukas Czerner | 367a51a3 | 2010-10-27 21:30:11 -0400 | [diff] [blame] | 327 | #define FITRIM _IOWR('X', 121, struct fstrim_range) /* Trim */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | |
David Howells | 3669567 | 2006-08-29 19:06:16 +0100 | [diff] [blame] | 329 | #define FS_IOC_GETFLAGS _IOR('f', 1, long) |
| 330 | #define FS_IOC_SETFLAGS _IOW('f', 2, long) |
| 331 | #define FS_IOC_GETVERSION _IOR('v', 1, long) |
| 332 | #define FS_IOC_SETVERSION _IOW('v', 2, long) |
Mark Fasheh | c4b929b | 2008-10-08 19:44:18 -0400 | [diff] [blame] | 333 | #define FS_IOC_FIEMAP _IOWR('f', 11, struct fiemap) |
David Howells | 3669567 | 2006-08-29 19:06:16 +0100 | [diff] [blame] | 334 | #define FS_IOC32_GETFLAGS _IOR('f', 1, int) |
| 335 | #define FS_IOC32_SETFLAGS _IOW('f', 2, int) |
| 336 | #define FS_IOC32_GETVERSION _IOR('v', 1, int) |
| 337 | #define FS_IOC32_SETVERSION _IOW('v', 2, int) |
| 338 | |
| 339 | /* |
| 340 | * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS) |
| 341 | */ |
| 342 | #define FS_SECRM_FL 0x00000001 /* Secure deletion */ |
| 343 | #define FS_UNRM_FL 0x00000002 /* Undelete */ |
| 344 | #define FS_COMPR_FL 0x00000004 /* Compress file */ |
| 345 | #define FS_SYNC_FL 0x00000008 /* Synchronous updates */ |
| 346 | #define FS_IMMUTABLE_FL 0x00000010 /* Immutable file */ |
| 347 | #define FS_APPEND_FL 0x00000020 /* writes to file may only append */ |
| 348 | #define FS_NODUMP_FL 0x00000040 /* do not dump file */ |
| 349 | #define FS_NOATIME_FL 0x00000080 /* do not update atime */ |
| 350 | /* Reserved for compression usage... */ |
| 351 | #define FS_DIRTY_FL 0x00000100 |
| 352 | #define FS_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ |
| 353 | #define FS_NOCOMP_FL 0x00000400 /* Don't compress */ |
| 354 | #define FS_ECOMPR_FL 0x00000800 /* Compression error */ |
| 355 | /* End compression flags --- maybe not all used */ |
| 356 | #define FS_BTREE_FL 0x00001000 /* btree format dir */ |
| 357 | #define FS_INDEX_FL 0x00001000 /* hash-indexed directory */ |
| 358 | #define FS_IMAGIC_FL 0x00002000 /* AFS directory */ |
| 359 | #define FS_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */ |
| 360 | #define FS_NOTAIL_FL 0x00008000 /* file tail should not be merged */ |
| 361 | #define FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ |
| 362 | #define FS_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ |
Steven Whitehouse | 128e5eb | 2006-10-02 11:24:43 -0400 | [diff] [blame] | 363 | #define FS_EXTENT_FL 0x00080000 /* Extents */ |
| 364 | #define FS_DIRECTIO_FL 0x00100000 /* Use direct i/o */ |
liubo | 32471f6 | 2011-03-21 08:54:27 +0000 | [diff] [blame] | 365 | #define FS_NOCOW_FL 0x00800000 /* Do not cow file */ |
David Howells | 3669567 | 2006-08-29 19:06:16 +0100 | [diff] [blame] | 366 | #define FS_RESERVED_FL 0x80000000 /* reserved for ext2 lib */ |
| 367 | |
| 368 | #define FS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */ |
| 369 | #define FS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */ |
| 370 | |
| 371 | |
Andrew Morton | e46e490 | 2006-05-22 22:35:24 -0700 | [diff] [blame] | 372 | #define SYNC_FILE_RANGE_WAIT_BEFORE 1 |
| 373 | #define SYNC_FILE_RANGE_WRITE 2 |
| 374 | #define SYNC_FILE_RANGE_WAIT_AFTER 4 |
| 375 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | #ifdef __KERNEL__ |
| 377 | |
| 378 | #include <linux/linkage.h> |
| 379 | #include <linux/wait.h> |
| 380 | #include <linux/types.h> |
| 381 | #include <linux/kdev_t.h> |
| 382 | #include <linux/dcache.h> |
Al Viro | 3f8206d | 2008-07-26 03:46:43 -0400 | [diff] [blame] | 383 | #include <linux/path.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | #include <linux/stat.h> |
| 385 | #include <linux/cache.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | #include <linux/list.h> |
| 387 | #include <linux/radix-tree.h> |
| 388 | #include <linux/prio_tree.h> |
| 389 | #include <linux/init.h> |
Al Viro | 914e263 | 2006-10-18 13:55:46 -0400 | [diff] [blame] | 390 | #include <linux/pid.h> |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 391 | #include <linux/mutex.h> |
Satyam Sharma | 3bd858a | 2007-07-17 15:00:08 +0530 | [diff] [blame] | 392 | #include <linux/capability.h> |
Matthew Wilcox | 6188e10 | 2008-04-18 22:21:05 -0400 | [diff] [blame] | 393 | #include <linux/semaphore.h> |
Mark Fasheh | c4b929b | 2008-10-08 19:44:18 -0400 | [diff] [blame] | 394 | #include <linux/fiemap.h> |
Nick Piggin | ceb5bdc | 2011-01-07 17:50:05 +1100 | [diff] [blame] | 395 | #include <linux/rculist_bl.h> |
Al Viro | 07b8ce1 | 2011-06-20 10:52:57 -0400 | [diff] [blame] | 396 | #include <linux/atomic.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | #include <asm/byteorder.h> |
| 399 | |
Christoph Hellwig | a569425 | 2007-07-17 04:04:28 -0700 | [diff] [blame] | 400 | struct export_operations; |
Christoph Hellwig | a885c8c | 2006-01-08 01:02:50 -0800 | [diff] [blame] | 401 | struct hd_geometry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | struct iovec; |
| 403 | struct nameidata; |
Christoph Hellwig | 92198f7 | 2005-06-23 22:00:59 -0700 | [diff] [blame] | 404 | struct kiocb; |
Alexey Dobriyan | 57cc721 | 2011-01-10 08:18:25 +0200 | [diff] [blame] | 405 | struct kobject; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | struct pipe_inode_info; |
| 407 | struct poll_table_struct; |
| 408 | struct kstatfs; |
| 409 | struct vm_area_struct; |
| 410 | struct vfsmount; |
David Howells | 745ca24 | 2008-11-14 10:39:22 +1100 | [diff] [blame] | 411 | struct cred; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | |
Denis Cheng | 74bf17c | 2007-10-16 23:26:30 -0700 | [diff] [blame] | 413 | extern void __init inode_init(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | extern void __init inode_init_early(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | extern void __init files_init(unsigned long); |
| 416 | |
Jan Engelhardt | dded4f4 | 2008-12-01 14:34:50 -0800 | [diff] [blame] | 417 | extern struct files_stat_struct files_stat; |
Eric Dumazet | 518de9b | 2010-10-26 14:22:44 -0700 | [diff] [blame] | 418 | extern unsigned long get_max_files(void); |
Jan Engelhardt | dded4f4 | 2008-12-01 14:34:50 -0800 | [diff] [blame] | 419 | extern int sysctl_nr_open; |
| 420 | extern struct inodes_stat_t inodes_stat; |
| 421 | extern int leases_enable, lease_break_time; |
Jan Engelhardt | dded4f4 | 2008-12-01 14:34:50 -0800 | [diff] [blame] | 422 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | struct buffer_head; |
| 424 | typedef int (get_block_t)(struct inode *inode, sector_t iblock, |
| 425 | struct buffer_head *bh_result, int create); |
Christoph Hellwig | 92198f7 | 2005-06-23 22:00:59 -0700 | [diff] [blame] | 426 | typedef void (dio_iodone_t)(struct kiocb *iocb, loff_t offset, |
Christoph Hellwig | 40e2e97 | 2010-07-18 21:17:09 +0000 | [diff] [blame] | 427 | ssize_t bytes, void *private, int ret, |
| 428 | bool is_async); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | |
| 430 | /* |
| 431 | * Attribute flags. These should be or-ed together to figure out what |
| 432 | * has been changed! |
| 433 | */ |
Miklos Szeredi | 9767d74 | 2008-07-01 15:01:26 +0200 | [diff] [blame] | 434 | #define ATTR_MODE (1 << 0) |
| 435 | #define ATTR_UID (1 << 1) |
| 436 | #define ATTR_GID (1 << 2) |
| 437 | #define ATTR_SIZE (1 << 3) |
| 438 | #define ATTR_ATIME (1 << 4) |
| 439 | #define ATTR_MTIME (1 << 5) |
| 440 | #define ATTR_CTIME (1 << 6) |
| 441 | #define ATTR_ATIME_SET (1 << 7) |
| 442 | #define ATTR_MTIME_SET (1 << 8) |
| 443 | #define ATTR_FORCE (1 << 9) /* Not a change, but a change it */ |
| 444 | #define ATTR_ATTR_FLAG (1 << 10) |
| 445 | #define ATTR_KILL_SUID (1 << 11) |
| 446 | #define ATTR_KILL_SGID (1 << 12) |
| 447 | #define ATTR_FILE (1 << 13) |
| 448 | #define ATTR_KILL_PRIV (1 << 14) |
| 449 | #define ATTR_OPEN (1 << 15) /* Truncating from open(O_TRUNC) */ |
| 450 | #define ATTR_TIMES_SET (1 << 16) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | |
| 452 | /* |
| 453 | * This is the Inode Attributes structure, used for notify_change(). It |
| 454 | * uses the above definitions as flags, to know which values have changed. |
| 455 | * Also, in this manner, a Filesystem can look at only the values it cares |
| 456 | * about. Basically, these are the attributes that the VFS layer can |
| 457 | * request to change from the FS layer. |
| 458 | * |
| 459 | * Derek Atkins <warlord@MIT.EDU> 94-10-20 |
| 460 | */ |
| 461 | struct iattr { |
| 462 | unsigned int ia_valid; |
| 463 | umode_t ia_mode; |
| 464 | uid_t ia_uid; |
| 465 | gid_t ia_gid; |
| 466 | loff_t ia_size; |
| 467 | struct timespec ia_atime; |
| 468 | struct timespec ia_mtime; |
| 469 | struct timespec ia_ctime; |
Miklos Szeredi | cc4e69d | 2005-11-07 00:59:49 -0800 | [diff] [blame] | 470 | |
| 471 | /* |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 472 | * Not an attribute, but an auxiliary info for filesystems wanting to |
Miklos Szeredi | cc4e69d | 2005-11-07 00:59:49 -0800 | [diff] [blame] | 473 | * implement an ftruncate() like method. NOTE: filesystem should |
| 474 | * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL). |
| 475 | */ |
| 476 | struct file *ia_file; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | }; |
| 478 | |
| 479 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | * Includes for diskquotas. |
| 481 | */ |
| 482 | #include <linux/quota.h> |
| 483 | |
Zach Brown | 994fc28c | 2005-12-15 14:28:17 -0800 | [diff] [blame] | 484 | /** |
| 485 | * enum positive_aop_returns - aop return codes with specific semantics |
| 486 | * |
| 487 | * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has |
| 488 | * completed, that the page is still locked, and |
| 489 | * should be considered active. The VM uses this hint |
| 490 | * to return the page to the active list -- it won't |
| 491 | * be a candidate for writeback again in the near |
| 492 | * future. Other callers must be careful to unlock |
| 493 | * the page if they get this return. Returned by |
| 494 | * writepage(); |
| 495 | * |
| 496 | * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has |
| 497 | * unlocked it and the page might have been truncated. |
| 498 | * The caller should back up to acquiring a new page and |
| 499 | * trying again. The aop will be taking reasonable |
| 500 | * precautions not to livelock. If the caller held a page |
| 501 | * reference, it should drop it before retrying. Returned |
Nick Piggin | 5514476 | 2007-10-16 01:25:26 -0700 | [diff] [blame] | 502 | * by readpage(). |
Zach Brown | 994fc28c | 2005-12-15 14:28:17 -0800 | [diff] [blame] | 503 | * |
| 504 | * address_space_operation functions return these large constants to indicate |
| 505 | * special semantics to the caller. These are much larger than the bytes in a |
| 506 | * page to allow for functions that return the number of bytes operated on in a |
| 507 | * given page. |
| 508 | */ |
| 509 | |
| 510 | enum positive_aop_returns { |
| 511 | AOP_WRITEPAGE_ACTIVATE = 0x80000, |
| 512 | AOP_TRUNCATED_PAGE = 0x80001, |
| 513 | }; |
| 514 | |
Nick Piggin | afddba4 | 2007-10-16 01:25:01 -0700 | [diff] [blame] | 515 | #define AOP_FLAG_UNINTERRUPTIBLE 0x0001 /* will not do a short write */ |
Nick Piggin | 89e1078 | 2007-10-16 01:25:07 -0700 | [diff] [blame] | 516 | #define AOP_FLAG_CONT_EXPAND 0x0002 /* called from cont_expand */ |
Nick Piggin | 54566b2 | 2009-01-04 12:00:53 -0800 | [diff] [blame] | 517 | #define AOP_FLAG_NOFS 0x0004 /* used by filesystem to direct |
| 518 | * helper code (eg buffer layer) |
| 519 | * to clear GFP_FS from alloc */ |
Nick Piggin | afddba4 | 2007-10-16 01:25:01 -0700 | [diff] [blame] | 520 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | /* |
| 522 | * oh the beauties of C type declarations. |
| 523 | */ |
| 524 | struct page; |
| 525 | struct address_space; |
| 526 | struct writeback_control; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | |
Nick Piggin | 2f718ff | 2007-10-16 01:24:59 -0700 | [diff] [blame] | 528 | struct iov_iter { |
| 529 | const struct iovec *iov; |
| 530 | unsigned long nr_segs; |
| 531 | size_t iov_offset; |
| 532 | size_t count; |
| 533 | }; |
| 534 | |
| 535 | size_t iov_iter_copy_from_user_atomic(struct page *page, |
| 536 | struct iov_iter *i, unsigned long offset, size_t bytes); |
| 537 | size_t iov_iter_copy_from_user(struct page *page, |
| 538 | struct iov_iter *i, unsigned long offset, size_t bytes); |
| 539 | void iov_iter_advance(struct iov_iter *i, size_t bytes); |
Nick Piggin | afddba4 | 2007-10-16 01:25:01 -0700 | [diff] [blame] | 540 | 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] | 541 | size_t iov_iter_single_seg_count(struct iov_iter *i); |
| 542 | |
| 543 | static inline void iov_iter_init(struct iov_iter *i, |
| 544 | const struct iovec *iov, unsigned long nr_segs, |
| 545 | size_t count, size_t written) |
| 546 | { |
| 547 | i->iov = iov; |
| 548 | i->nr_segs = nr_segs; |
| 549 | i->iov_offset = 0; |
| 550 | i->count = count + written; |
| 551 | |
| 552 | iov_iter_advance(i, written); |
| 553 | } |
| 554 | |
| 555 | static inline size_t iov_iter_count(struct iov_iter *i) |
| 556 | { |
| 557 | return i->count; |
| 558 | } |
| 559 | |
Hisashi Hifumi | 8ab22b9 | 2008-07-28 15:46:36 -0700 | [diff] [blame] | 560 | /* |
| 561 | * "descriptor" for what we're up to with a read. |
| 562 | * This allows us to use the same read code yet |
| 563 | * have multiple different users of the data that |
| 564 | * we read from a file. |
| 565 | * |
| 566 | * The simplest case just copies the data to user |
| 567 | * mode. |
| 568 | */ |
| 569 | typedef struct { |
| 570 | size_t written; |
| 571 | size_t count; |
| 572 | union { |
| 573 | char __user *buf; |
| 574 | void *data; |
| 575 | } arg; |
| 576 | int error; |
| 577 | } read_descriptor_t; |
| 578 | |
| 579 | typedef int (*read_actor_t)(read_descriptor_t *, struct page *, |
| 580 | unsigned long, unsigned long); |
Nick Piggin | 2f718ff | 2007-10-16 01:24:59 -0700 | [diff] [blame] | 581 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | struct address_space_operations { |
| 583 | int (*writepage)(struct page *page, struct writeback_control *wbc); |
| 584 | int (*readpage)(struct file *, struct page *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | |
| 586 | /* Write back some dirty pages from this mapping. */ |
| 587 | int (*writepages)(struct address_space *, struct writeback_control *); |
| 588 | |
Andrew Morton | 4741c9f | 2006-03-24 03:18:11 -0800 | [diff] [blame] | 589 | /* Set a page dirty. Return true if this dirtied it */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | int (*set_page_dirty)(struct page *page); |
| 591 | |
| 592 | int (*readpages)(struct file *filp, struct address_space *mapping, |
| 593 | struct list_head *pages, unsigned nr_pages); |
| 594 | |
Nick Piggin | afddba4 | 2007-10-16 01:25:01 -0700 | [diff] [blame] | 595 | int (*write_begin)(struct file *, struct address_space *mapping, |
| 596 | loff_t pos, unsigned len, unsigned flags, |
| 597 | struct page **pagep, void **fsdata); |
| 598 | int (*write_end)(struct file *, struct address_space *mapping, |
| 599 | loff_t pos, unsigned len, unsigned copied, |
| 600 | struct page *page, void *fsdata); |
| 601 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | /* Unfortunately this kludge is needed for FIBMAP. Don't use it */ |
| 603 | sector_t (*bmap)(struct address_space *, sector_t); |
NeilBrown | 2ff28e2 | 2006-03-26 01:37:18 -0800 | [diff] [blame] | 604 | void (*invalidatepage) (struct page *, unsigned long); |
Al Viro | 27496a8 | 2005-10-21 03:20:48 -0400 | [diff] [blame] | 605 | int (*releasepage) (struct page *, gfp_t); |
Linus Torvalds | 6072d13 | 2010-12-01 13:35:19 -0500 | [diff] [blame] | 606 | void (*freepage)(struct page *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | ssize_t (*direct_IO)(int, struct kiocb *, const struct iovec *iov, |
| 608 | loff_t offset, unsigned long nr_segs); |
Nick Piggin | 70688e4 | 2008-04-28 02:13:02 -0700 | [diff] [blame] | 609 | int (*get_xip_mem)(struct address_space *, pgoff_t, int, |
| 610 | void **, unsigned long *); |
Christoph Lameter | e965f96 | 2006-02-01 03:05:41 -0800 | [diff] [blame] | 611 | /* migrate the contents of a page to the specified target */ |
Christoph Lameter | 2d1db3b | 2006-06-23 02:03:33 -0700 | [diff] [blame] | 612 | int (*migratepage) (struct address_space *, |
| 613 | struct page *, struct page *); |
Trond Myklebust | e3db769 | 2007-01-10 23:15:39 -0800 | [diff] [blame] | 614 | int (*launder_page) (struct page *); |
Hisashi Hifumi | 8ab22b9 | 2008-07-28 15:46:36 -0700 | [diff] [blame] | 615 | int (*is_partially_uptodate) (struct page *, read_descriptor_t *, |
| 616 | unsigned long); |
Andi Kleen | 2571873 | 2009-09-16 11:50:13 +0200 | [diff] [blame] | 617 | int (*error_remove_page)(struct address_space *, struct page *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | }; |
| 619 | |
Jens Axboe | 7dcda1c | 2011-04-05 23:51:48 +0200 | [diff] [blame] | 620 | extern const struct address_space_operations empty_aops; |
| 621 | |
Nick Piggin | afddba4 | 2007-10-16 01:25:01 -0700 | [diff] [blame] | 622 | /* |
| 623 | * pagecache_write_begin/pagecache_write_end must be used by general code |
| 624 | * to write into the pagecache. |
| 625 | */ |
| 626 | int pagecache_write_begin(struct file *, struct address_space *mapping, |
| 627 | loff_t pos, unsigned len, unsigned flags, |
| 628 | struct page **pagep, void **fsdata); |
| 629 | |
| 630 | int pagecache_write_end(struct file *, struct address_space *mapping, |
| 631 | loff_t pos, unsigned len, unsigned copied, |
| 632 | struct page *page, void *fsdata); |
| 633 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | struct backing_dev_info; |
| 635 | struct address_space { |
| 636 | struct inode *host; /* owner: inode, block_device */ |
| 637 | struct radix_tree_root page_tree; /* radix tree of all pages */ |
Nick Piggin | 19fd623 | 2008-07-25 19:45:32 -0700 | [diff] [blame] | 638 | spinlock_t tree_lock; /* and lock protecting it */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 639 | unsigned int i_mmap_writable;/* count VM_SHARED mappings */ |
| 640 | struct prio_tree_root i_mmap; /* tree of private and shared mappings */ |
| 641 | struct list_head i_mmap_nonlinear;/*list VM_NONLINEAR mappings */ |
Peter Zijlstra | 3d48ae4 | 2011-05-24 17:12:06 -0700 | [diff] [blame] | 642 | struct mutex i_mmap_mutex; /* protect tree, count, list */ |
Jan Kara | 0814257 | 2011-06-27 16:18:10 -0700 | [diff] [blame] | 643 | /* Protected by tree_lock together with the radix tree */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | unsigned long nrpages; /* number of total pages */ |
| 645 | pgoff_t writeback_index;/* writeback starts here */ |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 646 | const struct address_space_operations *a_ops; /* methods */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | unsigned long flags; /* error bits/gfp mask */ |
| 648 | struct backing_dev_info *backing_dev_info; /* device readahead, etc */ |
| 649 | spinlock_t private_lock; /* for use by the address_space */ |
| 650 | struct list_head private_list; /* ditto */ |
| 651 | struct address_space *assoc_mapping; /* ditto */ |
| 652 | } __attribute__((aligned(sizeof(long)))); |
| 653 | /* |
| 654 | * On most architectures that alignment is already the case; but |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 655 | * must be enforced here for CRIS, to let the least significant bit |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON. |
| 657 | */ |
| 658 | |
| 659 | struct block_device { |
| 660 | dev_t bd_dev; /* not a kdev_t - it's a search key */ |
Richard Kennedy | f3ccfcd | 2011-03-22 16:33:56 -0700 | [diff] [blame] | 661 | int bd_openers; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | struct inode * bd_inode; /* will die */ |
Theodore Ts'o | 87d8fe1 | 2009-01-03 09:47:09 -0500 | [diff] [blame] | 663 | struct super_block * bd_super; |
Arjan van de Ven | c039e31 | 2006-03-23 03:00:28 -0800 | [diff] [blame] | 664 | struct mutex bd_mutex; /* open/close mutex */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | struct list_head bd_inodes; |
Tejun Heo | 6b4517a | 2010-04-07 18:53:59 +0900 | [diff] [blame] | 666 | void * bd_claiming; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | void * bd_holder; |
| 668 | int bd_holders; |
Tejun Heo | 77ea887 | 2010-12-08 20:57:37 +0100 | [diff] [blame] | 669 | bool bd_write_holder; |
Jun'ichi Nomura | 641dc63 | 2006-03-27 01:17:57 -0800 | [diff] [blame] | 670 | #ifdef CONFIG_SYSFS |
Tejun Heo | 49731ba | 2011-01-14 18:43:57 +0100 | [diff] [blame] | 671 | struct list_head bd_holder_disks; |
Jun'ichi Nomura | 641dc63 | 2006-03-27 01:17:57 -0800 | [diff] [blame] | 672 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | struct block_device * bd_contains; |
| 674 | unsigned bd_block_size; |
| 675 | struct hd_struct * bd_part; |
| 676 | /* number of times partitions within this device have been opened. */ |
| 677 | unsigned bd_part_count; |
| 678 | int bd_invalidated; |
| 679 | struct gendisk * bd_disk; |
| 680 | struct list_head bd_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | /* |
| 682 | * Private data. You must have bd_claim'ed the block_device |
| 683 | * to use this. NOTE: bd_claim allows an owner to claim |
| 684 | * the same device multiple times, the owner must take special |
| 685 | * care to not mess up bd_private for that case. |
| 686 | */ |
| 687 | unsigned long bd_private; |
Takashi Sato | fcccf50 | 2009-01-09 16:40:59 -0800 | [diff] [blame] | 688 | |
| 689 | /* The counter of freeze processes */ |
| 690 | int bd_fsfreeze_count; |
| 691 | /* Mutex for freeze */ |
| 692 | struct mutex bd_fsfreeze_mutex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | }; |
| 694 | |
| 695 | /* |
| 696 | * Radix-tree tags, for tagging dirty and writeback pages within the pagecache |
| 697 | * radix trees |
| 698 | */ |
| 699 | #define PAGECACHE_TAG_DIRTY 0 |
| 700 | #define PAGECACHE_TAG_WRITEBACK 1 |
Jan Kara | f446daae | 2010-08-09 17:19:12 -0700 | [diff] [blame] | 701 | #define PAGECACHE_TAG_TOWRITE 2 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | |
| 703 | int mapping_tagged(struct address_space *mapping, int tag); |
| 704 | |
| 705 | /* |
| 706 | * Might pages of this file be mapped into userspace? |
| 707 | */ |
| 708 | static inline int mapping_mapped(struct address_space *mapping) |
| 709 | { |
| 710 | return !prio_tree_empty(&mapping->i_mmap) || |
| 711 | !list_empty(&mapping->i_mmap_nonlinear); |
| 712 | } |
| 713 | |
| 714 | /* |
| 715 | * Might pages of this file have been modified in userspace? |
| 716 | * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff |
| 717 | * marks vma as VM_SHARED if it is shared, and the file was opened for |
| 718 | * writing i.e. vma may be mprotected writable even if now readonly. |
| 719 | */ |
| 720 | static inline int mapping_writably_mapped(struct address_space *mapping) |
| 721 | { |
| 722 | return mapping->i_mmap_writable != 0; |
| 723 | } |
| 724 | |
| 725 | /* |
| 726 | * Use sequence counter to get consistent i_size on 32-bit processors. |
| 727 | */ |
| 728 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) |
| 729 | #include <linux/seqlock.h> |
| 730 | #define __NEED_I_SIZE_ORDERED |
| 731 | #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount) |
| 732 | #else |
| 733 | #define i_size_ordered_init(inode) do { } while (0) |
| 734 | #endif |
| 735 | |
Al Viro | f19d4a8 | 2009-06-08 19:50:45 -0400 | [diff] [blame] | 736 | struct posix_acl; |
| 737 | #define ACL_NOT_CACHED ((void *)(-1)) |
| 738 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 739 | struct inode { |
Nick Piggin | 44a7d7a | 2011-01-07 17:49:56 +1100 | [diff] [blame] | 740 | /* RCU path lookup touches following: */ |
| 741 | umode_t i_mode; |
| 742 | uid_t i_uid; |
| 743 | gid_t i_gid; |
| 744 | const struct inode_operations *i_op; |
| 745 | struct super_block *i_sb; |
| 746 | |
| 747 | spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */ |
| 748 | unsigned int i_flags; |
Linus Torvalds | 79568f5 | 2011-06-20 20:13:49 -0700 | [diff] [blame] | 749 | unsigned long i_state; |
Linus Torvalds | 13e12d1 | 2011-06-08 15:18:19 -0700 | [diff] [blame] | 750 | #ifdef CONFIG_SECURITY |
| 751 | void *i_security; |
| 752 | #endif |
Nick Piggin | 44a7d7a | 2011-01-07 17:49:56 +1100 | [diff] [blame] | 753 | struct mutex i_mutex; |
| 754 | |
Linus Torvalds | 13e12d1 | 2011-06-08 15:18:19 -0700 | [diff] [blame] | 755 | |
Nick Piggin | 44a7d7a | 2011-01-07 17:49:56 +1100 | [diff] [blame] | 756 | unsigned long dirtied_when; /* jiffies of first dirtying */ |
| 757 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 758 | struct hlist_node i_hash; |
Nick Piggin | 7ccf19a | 2010-10-21 11:49:30 +1100 | [diff] [blame] | 759 | struct list_head i_wb_list; /* backing dev IO list */ |
| 760 | struct list_head i_lru; /* inode LRU list */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 761 | struct list_head i_sb_list; |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 762 | union { |
| 763 | struct list_head i_dentry; |
| 764 | struct rcu_head i_rcu; |
| 765 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | unsigned long i_ino; |
| 767 | atomic_t i_count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | unsigned int i_nlink; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | dev_t i_rdev; |
Richard Kennedy | 4e70af5 | 2010-02-15 11:16:11 +0000 | [diff] [blame] | 770 | unsigned int i_blkbits; |
Jean Noel Cordenner | 7a22422 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 771 | u64 i_version; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 772 | loff_t i_size; |
Eric Dumazet | 83b7b44 | 2006-12-06 20:38:53 -0800 | [diff] [blame] | 773 | #ifdef __NEED_I_SIZE_ORDERED |
| 774 | seqcount_t i_size_seqcount; |
| 775 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 776 | struct timespec i_atime; |
| 777 | struct timespec i_mtime; |
| 778 | struct timespec i_ctime; |
Takashi Sato | a0f62ac | 2006-03-26 01:37:52 -0800 | [diff] [blame] | 779 | blkcnt_t i_blocks; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | unsigned short i_bytes; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | struct rw_semaphore i_alloc_sem; |
Arjan van de Ven | 99ac48f | 2006-03-28 01:56:41 -0800 | [diff] [blame] | 782 | const struct file_operations *i_fop; /* former ->i_op->default_file_ops */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 783 | struct file_lock *i_flock; |
| 784 | struct address_space *i_mapping; |
| 785 | struct address_space i_data; |
| 786 | #ifdef CONFIG_QUOTA |
| 787 | struct dquot *i_dquot[MAXQUOTAS]; |
| 788 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | struct list_head i_devices; |
Theodore Ts'o | 4c15416 | 2006-09-27 01:50:47 -0700 | [diff] [blame] | 790 | union { |
| 791 | struct pipe_inode_info *i_pipe; |
Theodore Ts'o | eaf796e | 2006-09-27 01:50:48 -0700 | [diff] [blame] | 792 | struct block_device *i_bdev; |
Theodore Ts'o | 577c4eb | 2006-09-27 01:50:49 -0700 | [diff] [blame] | 793 | struct cdev *i_cdev; |
Theodore Ts'o | 4c15416 | 2006-09-27 01:50:47 -0700 | [diff] [blame] | 794 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | |
| 796 | __u32 i_generation; |
| 797 | |
Eric Paris | 3be25f4 | 2009-05-21 17:01:26 -0400 | [diff] [blame] | 798 | #ifdef CONFIG_FSNOTIFY |
| 799 | __u32 i_fsnotify_mask; /* all events this inode cares about */ |
Eric Paris | e61ce86 | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 800 | struct hlist_head i_fsnotify_marks; |
Robert Love | 0eeca28 | 2005-07-12 17:06:03 -0400 | [diff] [blame] | 801 | #endif |
| 802 | |
Eric Paris | a178d20 | 2010-10-25 14:41:59 -0400 | [diff] [blame] | 803 | #ifdef CONFIG_IMA |
Mimi Zohar | a68a27b | 2010-11-02 10:10:56 -0400 | [diff] [blame] | 804 | atomic_t i_readcount; /* struct files open RO */ |
Eric Paris | a178d20 | 2010-10-25 14:41:59 -0400 | [diff] [blame] | 805 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 806 | atomic_t i_writecount; |
Al Viro | f19d4a8 | 2009-06-08 19:50:45 -0400 | [diff] [blame] | 807 | #ifdef CONFIG_FS_POSIX_ACL |
| 808 | struct posix_acl *i_acl; |
| 809 | struct posix_acl *i_default_acl; |
| 810 | #endif |
Theodore Ts'o | 8e18e29 | 2006-09-27 01:50:46 -0700 | [diff] [blame] | 811 | void *i_private; /* fs or device private pointer */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 812 | }; |
| 813 | |
Al Viro | 1d3382cb | 2010-10-23 15:19:20 -0400 | [diff] [blame] | 814 | static inline int inode_unhashed(struct inode *inode) |
| 815 | { |
| 816 | return hlist_unhashed(&inode->i_hash); |
| 817 | } |
| 818 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 819 | /* |
Ingo Molnar | f2eace2 | 2006-07-03 00:25:05 -0700 | [diff] [blame] | 820 | * inode->i_mutex nesting subclasses for the lock validator: |
| 821 | * |
| 822 | * 0: the object of the current VFS operation |
| 823 | * 1: parent |
| 824 | * 2: child/target |
| 825 | * 3: quota file |
| 826 | * |
| 827 | * The locking order between these classes is |
Ingo Molnar | 4df4624 | 2006-08-27 01:23:56 -0700 | [diff] [blame] | 828 | * parent -> child -> normal -> xattr -> quota |
Ingo Molnar | f2eace2 | 2006-07-03 00:25:05 -0700 | [diff] [blame] | 829 | */ |
| 830 | enum inode_i_mutex_lock_class |
| 831 | { |
| 832 | I_MUTEX_NORMAL, |
| 833 | I_MUTEX_PARENT, |
| 834 | I_MUTEX_CHILD, |
Ingo Molnar | 4df4624 | 2006-08-27 01:23:56 -0700 | [diff] [blame] | 835 | I_MUTEX_XATTR, |
Ingo Molnar | f2eace2 | 2006-07-03 00:25:05 -0700 | [diff] [blame] | 836 | I_MUTEX_QUOTA |
| 837 | }; |
| 838 | |
| 839 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | * NOTE: in a 32bit arch with a preemptable kernel and |
| 841 | * an UP compile the i_size_read/write must be atomic |
| 842 | * with respect to the local cpu (unlike with preempt disabled), |
| 843 | * but they don't need to be atomic with respect to other cpus like in |
| 844 | * true SMP (so they need either to either locally disable irq around |
| 845 | * the read or for example on x86 they can be still implemented as a |
| 846 | * cmpxchg8b without the need of the lock prefix). For SMP compiles |
| 847 | * and 64bit archs it makes no difference if preempt is enabled or not. |
| 848 | */ |
Jan Engelhardt | 48ed214 | 2006-12-06 20:35:37 -0800 | [diff] [blame] | 849 | static inline loff_t i_size_read(const struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 850 | { |
| 851 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) |
| 852 | loff_t i_size; |
| 853 | unsigned int seq; |
| 854 | |
| 855 | do { |
| 856 | seq = read_seqcount_begin(&inode->i_size_seqcount); |
| 857 | i_size = inode->i_size; |
| 858 | } while (read_seqcount_retry(&inode->i_size_seqcount, seq)); |
| 859 | return i_size; |
| 860 | #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) |
| 861 | loff_t i_size; |
| 862 | |
| 863 | preempt_disable(); |
| 864 | i_size = inode->i_size; |
| 865 | preempt_enable(); |
| 866 | return i_size; |
| 867 | #else |
| 868 | return inode->i_size; |
| 869 | #endif |
| 870 | } |
| 871 | |
Miklos Szeredi | 7762f5a | 2006-10-17 00:10:07 -0700 | [diff] [blame] | 872 | /* |
| 873 | * NOTE: unlike i_size_read(), i_size_write() does need locking around it |
| 874 | * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount |
| 875 | * can be lost, resulting in subsequent i_size_read() calls spinning forever. |
| 876 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 877 | static inline void i_size_write(struct inode *inode, loff_t i_size) |
| 878 | { |
| 879 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) |
| 880 | write_seqcount_begin(&inode->i_size_seqcount); |
| 881 | inode->i_size = i_size; |
| 882 | write_seqcount_end(&inode->i_size_seqcount); |
| 883 | #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) |
| 884 | preempt_disable(); |
| 885 | inode->i_size = i_size; |
| 886 | preempt_enable(); |
| 887 | #else |
| 888 | inode->i_size = i_size; |
| 889 | #endif |
| 890 | } |
| 891 | |
Jan Engelhardt | 48ed214 | 2006-12-06 20:35:37 -0800 | [diff] [blame] | 892 | static inline unsigned iminor(const struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 893 | { |
| 894 | return MINOR(inode->i_rdev); |
| 895 | } |
| 896 | |
Jan Engelhardt | 48ed214 | 2006-12-06 20:35:37 -0800 | [diff] [blame] | 897 | static inline unsigned imajor(const struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 898 | { |
| 899 | return MAJOR(inode->i_rdev); |
| 900 | } |
| 901 | |
| 902 | extern struct block_device *I_BDEV(struct inode *inode); |
| 903 | |
| 904 | struct fown_struct { |
| 905 | rwlock_t lock; /* protects pid, uid, euid fields */ |
Eric W. Biederman | 609d7fa | 2006-10-02 02:17:15 -0700 | [diff] [blame] | 906 | struct pid *pid; /* pid or -pgrp where SIGIO should be sent */ |
| 907 | 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] | 908 | uid_t uid, euid; /* uid/euid of process setting the owner */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | int signum; /* posix.1b rt signal to be delivered on IO */ |
| 910 | }; |
| 911 | |
| 912 | /* |
| 913 | * Track a single file's readahead state |
| 914 | */ |
| 915 | struct file_ra_state { |
Fengguang Wu | 937085a | 2007-10-16 01:24:31 -0700 | [diff] [blame] | 916 | pgoff_t start; /* where readahead started */ |
| 917 | unsigned int size; /* # of readahead pages */ |
| 918 | unsigned int async_size; /* do asynchronous readahead when |
Fengguang Wu | f9acc8c | 2007-07-19 01:48:08 -0700 | [diff] [blame] | 919 | there are only # of pages ahead */ |
Fengguang Wu | 5ce1110 | 2007-07-19 01:47:59 -0700 | [diff] [blame] | 920 | |
Fengguang Wu | 937085a | 2007-10-16 01:24:31 -0700 | [diff] [blame] | 921 | unsigned int ra_pages; /* Maximum readahead window */ |
Wu Fengguang | 1ebf26a | 2009-06-16 15:31:19 -0700 | [diff] [blame] | 922 | unsigned int mmap_miss; /* Cache miss stat for mmap accesses */ |
Fengguang Wu | f4e6b49 | 2007-10-16 01:24:33 -0700 | [diff] [blame] | 923 | loff_t prev_pos; /* Cache last read() position */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 924 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 925 | |
Fengguang Wu | 5ce1110 | 2007-07-19 01:47:59 -0700 | [diff] [blame] | 926 | /* |
Fengguang Wu | 5ce1110 | 2007-07-19 01:47:59 -0700 | [diff] [blame] | 927 | * Check if @index falls in the readahead windows. |
| 928 | */ |
| 929 | static inline int ra_has_index(struct file_ra_state *ra, pgoff_t index) |
| 930 | { |
Fengguang Wu | f9acc8c | 2007-07-19 01:48:08 -0700 | [diff] [blame] | 931 | return (index >= ra->start && |
| 932 | index < ra->start + ra->size); |
Fengguang Wu | 5ce1110 | 2007-07-19 01:47:59 -0700 | [diff] [blame] | 933 | } |
| 934 | |
Dave Hansen | ad775f5 | 2008-02-15 14:38:01 -0800 | [diff] [blame] | 935 | #define FILE_MNT_WRITE_TAKEN 1 |
| 936 | #define FILE_MNT_WRITE_RELEASED 2 |
| 937 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 938 | struct file { |
Eric Dumazet | 2f51201 | 2005-10-30 15:02:16 -0800 | [diff] [blame] | 939 | /* |
| 940 | * fu_list becomes invalid after file_free is called and queued via |
| 941 | * fu_rcuhead for RCU freeing |
| 942 | */ |
| 943 | union { |
| 944 | struct list_head fu_list; |
| 945 | struct rcu_head fu_rcuhead; |
| 946 | } f_u; |
Josef "Jeff" Sipek | 0f7fc9e | 2006-12-08 02:36:35 -0800 | [diff] [blame] | 947 | struct path f_path; |
| 948 | #define f_dentry f_path.dentry |
| 949 | #define f_vfsmnt f_path.mnt |
Arjan van de Ven | 99ac48f | 2006-03-28 01:56:41 -0800 | [diff] [blame] | 950 | const struct file_operations *f_op; |
Jonathan Corbet | 4a6a449 | 2009-03-27 12:24:31 -0600 | [diff] [blame] | 951 | spinlock_t f_lock; /* f_ep_links, f_flags, no IRQ */ |
Nick Piggin | 6416ccb | 2010-08-18 04:37:38 +1000 | [diff] [blame] | 952 | #ifdef CONFIG_SMP |
| 953 | int f_sb_list_cpu; |
| 954 | #endif |
Al Viro | 516e0cc | 2008-07-26 00:39:17 -0400 | [diff] [blame] | 955 | atomic_long_t f_count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 956 | unsigned int f_flags; |
Al Viro | aeb5d72 | 2008-09-02 15:28:45 -0400 | [diff] [blame] | 957 | fmode_t f_mode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 958 | loff_t f_pos; |
| 959 | struct fown_struct f_owner; |
David Howells | d76b0d9 | 2008-11-14 10:39:25 +1100 | [diff] [blame] | 960 | const struct cred *f_cred; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 961 | struct file_ra_state f_ra; |
| 962 | |
Mathieu Desnoyers | 2b47c36 | 2007-10-16 23:27:21 -0700 | [diff] [blame] | 963 | u64 f_version; |
Alexey Dobriyan | 5046206 | 2006-09-29 02:00:01 -0700 | [diff] [blame] | 964 | #ifdef CONFIG_SECURITY |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 965 | void *f_security; |
Alexey Dobriyan | 5046206 | 2006-09-29 02:00:01 -0700 | [diff] [blame] | 966 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 967 | /* needed for tty driver, and maybe others */ |
| 968 | void *private_data; |
| 969 | |
| 970 | #ifdef CONFIG_EPOLL |
| 971 | /* Used by fs/eventpoll.c to link all the hooks to this file */ |
| 972 | struct list_head f_ep_links; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 973 | #endif /* #ifdef CONFIG_EPOLL */ |
| 974 | struct address_space *f_mapping; |
Dave Hansen | ad775f5 | 2008-02-15 14:38:01 -0800 | [diff] [blame] | 975 | #ifdef CONFIG_DEBUG_WRITECOUNT |
| 976 | unsigned long f_mnt_write_state; |
| 977 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 978 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 979 | |
Aneesh Kumar K.V | 990d6c2 | 2011-01-29 18:43:26 +0530 | [diff] [blame] | 980 | struct file_handle { |
| 981 | __u32 handle_bytes; |
| 982 | int handle_type; |
| 983 | /* file identifier */ |
| 984 | unsigned char f_handle[0]; |
| 985 | }; |
| 986 | |
Al Viro | 516e0cc | 2008-07-26 00:39:17 -0400 | [diff] [blame] | 987 | #define get_file(x) atomic_long_inc(&(x)->f_count) |
Al Viro | d7065da | 2010-05-26 15:13:55 -0400 | [diff] [blame] | 988 | #define fput_atomic(x) atomic_long_add_unless(&(x)->f_count, -1, 1) |
Al Viro | 516e0cc | 2008-07-26 00:39:17 -0400 | [diff] [blame] | 989 | #define file_count(x) atomic_long_read(&(x)->f_count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 990 | |
Dave Hansen | ad775f5 | 2008-02-15 14:38:01 -0800 | [diff] [blame] | 991 | #ifdef CONFIG_DEBUG_WRITECOUNT |
| 992 | static inline void file_take_write(struct file *f) |
| 993 | { |
| 994 | WARN_ON(f->f_mnt_write_state != 0); |
| 995 | f->f_mnt_write_state = FILE_MNT_WRITE_TAKEN; |
| 996 | } |
| 997 | static inline void file_release_write(struct file *f) |
| 998 | { |
| 999 | f->f_mnt_write_state |= FILE_MNT_WRITE_RELEASED; |
| 1000 | } |
| 1001 | static inline void file_reset_write(struct file *f) |
| 1002 | { |
| 1003 | f->f_mnt_write_state = 0; |
| 1004 | } |
| 1005 | static inline void file_check_state(struct file *f) |
| 1006 | { |
| 1007 | /* |
| 1008 | * At this point, either both or neither of these bits |
| 1009 | * should be set. |
| 1010 | */ |
| 1011 | WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN); |
| 1012 | WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_RELEASED); |
| 1013 | } |
| 1014 | static inline int file_check_writeable(struct file *f) |
| 1015 | { |
| 1016 | if (f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN) |
| 1017 | return 0; |
| 1018 | printk(KERN_WARNING "writeable file with no " |
| 1019 | "mnt_want_write()\n"); |
| 1020 | WARN_ON(1); |
| 1021 | return -EINVAL; |
| 1022 | } |
| 1023 | #else /* !CONFIG_DEBUG_WRITECOUNT */ |
| 1024 | static inline void file_take_write(struct file *filp) {} |
| 1025 | static inline void file_release_write(struct file *filp) {} |
| 1026 | static inline void file_reset_write(struct file *filp) {} |
| 1027 | static inline void file_check_state(struct file *filp) {} |
| 1028 | static inline int file_check_writeable(struct file *filp) |
| 1029 | { |
| 1030 | return 0; |
| 1031 | } |
| 1032 | #endif /* CONFIG_DEBUG_WRITECOUNT */ |
| 1033 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1034 | #define MAX_NON_LFS ((1UL<<31) - 1) |
| 1035 | |
| 1036 | /* Page cache limit. The filesystems should put that into their s_maxbytes |
| 1037 | limits, otherwise bad things can happen in VM. */ |
| 1038 | #if BITS_PER_LONG==32 |
| 1039 | #define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1) |
| 1040 | #elif BITS_PER_LONG==64 |
| 1041 | #define MAX_LFS_FILESIZE 0x7fffffffffffffffUL |
| 1042 | #endif |
| 1043 | |
| 1044 | #define FL_POSIX 1 |
| 1045 | #define FL_FLOCK 2 |
| 1046 | #define FL_ACCESS 8 /* not trying to lock, just looking */ |
Trond Myklebust | f475ae9 | 2006-06-29 16:38:32 -0400 | [diff] [blame] | 1047 | #define FL_EXISTS 16 /* when unlocking, test for existence */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1048 | #define FL_LEASE 32 /* lease held on this file */ |
Miklos Szeredi | 75e1fcc | 2006-06-23 02:05:12 -0700 | [diff] [blame] | 1049 | #define FL_CLOSE 64 /* unlock on close */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1050 | #define FL_SLEEP 128 /* A blocking lock */ |
| 1051 | |
| 1052 | /* |
Miklos Szeredi | bde74e4 | 2008-07-25 01:48:57 -0700 | [diff] [blame] | 1053 | * Special return value from posix_lock_file() and vfs_lock_file() for |
| 1054 | * asynchronous locking. |
| 1055 | */ |
| 1056 | #define FILE_LOCK_DEFERRED 1 |
| 1057 | |
| 1058 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1059 | * The POSIX file lock owner is determined by |
| 1060 | * the "struct files_struct" in the thread group |
| 1061 | * (or NULL for no owner - BSD locks). |
| 1062 | * |
| 1063 | * Lockd stuffs a "host" pointer into this. |
| 1064 | */ |
| 1065 | typedef struct files_struct *fl_owner_t; |
| 1066 | |
| 1067 | struct file_lock_operations { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1068 | void (*fl_copy_lock)(struct file_lock *, struct file_lock *); |
| 1069 | void (*fl_release_private)(struct file_lock *); |
| 1070 | }; |
| 1071 | |
| 1072 | struct lock_manager_operations { |
| 1073 | int (*fl_compare_owner)(struct file_lock *, struct file_lock *); |
| 1074 | void (*fl_notify)(struct file_lock *); /* unblock callback */ |
Marc Eshel | 2beb661 | 2006-12-05 23:31:28 -0500 | [diff] [blame] | 1075 | int (*fl_grant)(struct file_lock *, struct file_lock *, int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1076 | void (*fl_release_private)(struct file_lock *); |
| 1077 | void (*fl_break)(struct file_lock *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1078 | int (*fl_change)(struct file_lock **, int); |
| 1079 | }; |
| 1080 | |
J. Bruce Fields | af558e3 | 2007-09-06 12:34:25 -0400 | [diff] [blame] | 1081 | struct lock_manager { |
| 1082 | struct list_head list; |
| 1083 | }; |
| 1084 | |
| 1085 | void locks_start_grace(struct lock_manager *); |
| 1086 | void locks_end_grace(struct lock_manager *); |
| 1087 | int locks_in_grace(void); |
| 1088 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1089 | /* that will die - we need it for nfs_lock_info */ |
| 1090 | #include <linux/nfs_fs_i.h> |
| 1091 | |
| 1092 | struct file_lock { |
| 1093 | struct file_lock *fl_next; /* singly linked list for this inode */ |
| 1094 | struct list_head fl_link; /* doubly linked list of all locks */ |
| 1095 | struct list_head fl_block; /* circular list of blocked processes */ |
| 1096 | fl_owner_t fl_owner; |
Richard Kennedy | afc1246 | 2008-07-11 17:20:49 -0700 | [diff] [blame] | 1097 | unsigned char fl_flags; |
| 1098 | unsigned char fl_type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1099 | unsigned int fl_pid; |
Vitaliy Gusev | ab1f161 | 2008-01-17 00:07:08 +0000 | [diff] [blame] | 1100 | struct pid *fl_nspid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1101 | wait_queue_head_t fl_wait; |
| 1102 | struct file *fl_file; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1103 | loff_t fl_start; |
| 1104 | loff_t fl_end; |
| 1105 | |
| 1106 | struct fasync_struct * fl_fasync; /* for lease break notifications */ |
| 1107 | unsigned long fl_break_time; /* for nonblocking lease breaks */ |
| 1108 | |
Alexey Dobriyan | 6aed628 | 2009-09-21 17:01:11 -0700 | [diff] [blame] | 1109 | const struct file_lock_operations *fl_ops; /* Callbacks for filesystems */ |
Alexey Dobriyan | 7b02196 | 2009-09-21 17:01:12 -0700 | [diff] [blame] | 1110 | const struct lock_manager_operations *fl_lmops; /* Callbacks for lockmanagers */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1111 | union { |
| 1112 | struct nfs_lock_info nfs_fl; |
Trond Myklebust | 8d0a8a9 | 2005-06-22 17:16:32 +0000 | [diff] [blame] | 1113 | struct nfs4_lock_info nfs4_fl; |
David Howells | e8d6c55 | 2007-07-15 23:40:12 -0700 | [diff] [blame] | 1114 | struct { |
| 1115 | struct list_head link; /* link in AFS vnode's pending_locks list */ |
| 1116 | int state; /* state of grant or error if -ve */ |
| 1117 | } afs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1118 | } fl_u; |
| 1119 | }; |
| 1120 | |
| 1121 | /* The following constant reflects the upper bound of the file/locking space */ |
| 1122 | #ifndef OFFSET_MAX |
| 1123 | #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1))) |
| 1124 | #define OFFSET_MAX INT_LIMIT(loff_t) |
| 1125 | #define OFFT_OFFSET_MAX INT_LIMIT(off_t) |
| 1126 | #endif |
| 1127 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1128 | #include <linux/fcntl.h> |
| 1129 | |
Thomas Petazzoni | bfcd17a | 2008-08-06 15:12:22 +0200 | [diff] [blame] | 1130 | extern void send_sigio(struct fown_struct *fown, int fd, int band); |
| 1131 | |
Thomas Petazzoni | bfcd17a | 2008-08-06 15:12:22 +0200 | [diff] [blame] | 1132 | #ifdef CONFIG_FILE_LOCKING |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1133 | extern int fcntl_getlk(struct file *, struct flock __user *); |
Peter Staubach | c293621 | 2005-07-27 11:45:09 -0700 | [diff] [blame] | 1134 | extern int fcntl_setlk(unsigned int, struct file *, unsigned int, |
| 1135 | struct flock __user *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1136 | |
| 1137 | #if BITS_PER_LONG == 32 |
| 1138 | extern int fcntl_getlk64(struct file *, struct flock64 __user *); |
Peter Staubach | c293621 | 2005-07-27 11:45:09 -0700 | [diff] [blame] | 1139 | extern int fcntl_setlk64(unsigned int, struct file *, unsigned int, |
| 1140 | struct flock64 __user *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1141 | #endif |
| 1142 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1143 | extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg); |
| 1144 | extern int fcntl_getlease(struct file *filp); |
| 1145 | |
| 1146 | /* fs/locks.c */ |
J. Bruce Fields | 05fa313 | 2010-10-30 17:31:15 -0400 | [diff] [blame] | 1147 | void locks_free_lock(struct file_lock *fl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1148 | extern void locks_init_lock(struct file_lock *); |
Arnd Bergmann | c5b1f0d | 2010-10-27 15:46:08 +0200 | [diff] [blame] | 1149 | extern struct file_lock * locks_alloc_lock(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1150 | extern void locks_copy_lock(struct file_lock *, struct file_lock *); |
J. Bruce Fields | 1a747ee | 2008-04-24 10:08:22 -0400 | [diff] [blame] | 1151 | extern void __locks_copy_lock(struct file_lock *, const struct file_lock *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1152 | extern void locks_remove_posix(struct file *, fl_owner_t); |
| 1153 | extern void locks_remove_flock(struct file *); |
Felix Blyakher | a9e61e2 | 2009-03-31 15:12:56 -0500 | [diff] [blame] | 1154 | extern void locks_release_private(struct file_lock *); |
J. Bruce Fields | 6d34ac1 | 2007-05-11 16:09:32 -0400 | [diff] [blame] | 1155 | extern void posix_test_lock(struct file *, struct file_lock *); |
Marc Eshel | 150b393 | 2007-01-18 16:15:35 -0500 | [diff] [blame] | 1156 | 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] | 1157 | extern int posix_lock_file_wait(struct file *, struct file_lock *); |
J. Bruce Fields | 64a318e | 2006-01-03 09:55:46 +0100 | [diff] [blame] | 1158 | extern int posix_unblock_lock(struct file *, struct file_lock *); |
J. Bruce Fields | 3ee17ab | 2007-02-21 00:58:50 -0500 | [diff] [blame] | 1159 | extern int vfs_test_lock(struct file *, struct file_lock *); |
Marc Eshel | 150b393 | 2007-01-18 16:15:35 -0500 | [diff] [blame] | 1160 | 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] | 1161 | extern int vfs_cancel_lock(struct file *filp, struct file_lock *fl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1162 | extern int flock_lock_file_wait(struct file *filp, struct file_lock *fl); |
| 1163 | extern int __break_lease(struct inode *inode, unsigned int flags); |
| 1164 | extern void lease_get_mtime(struct inode *, struct timespec *time); |
Christoph Hellwig | 0af1a45 | 2007-07-31 00:39:22 -0700 | [diff] [blame] | 1165 | extern int generic_setlease(struct file *, long, struct file_lock **); |
J. Bruce Fields | a9933ce | 2007-06-07 17:09:49 -0400 | [diff] [blame] | 1166 | extern int vfs_setlease(struct file *, long, struct file_lock **); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1167 | extern int lease_modify(struct file_lock **, int); |
| 1168 | extern int lock_may_read(struct inode *, loff_t start, unsigned long count); |
| 1169 | extern int lock_may_write(struct inode *, loff_t start, unsigned long count); |
Arnd Bergmann | b89f432 | 2010-09-18 15:09:31 +0200 | [diff] [blame] | 1170 | extern void lock_flocks(void); |
| 1171 | extern void unlock_flocks(void); |
Thomas Petazzoni | bfcd17a | 2008-08-06 15:12:22 +0200 | [diff] [blame] | 1172 | #else /* !CONFIG_FILE_LOCKING */ |
Steven Whitehouse | c2aca5e | 2009-01-20 10:29:45 +0000 | [diff] [blame] | 1173 | static inline int fcntl_getlk(struct file *file, struct flock __user *user) |
| 1174 | { |
| 1175 | return -EINVAL; |
| 1176 | } |
| 1177 | |
| 1178 | static inline int fcntl_setlk(unsigned int fd, struct file *file, |
| 1179 | unsigned int cmd, struct flock __user *user) |
| 1180 | { |
| 1181 | return -EACCES; |
| 1182 | } |
| 1183 | |
Thomas Petazzoni | bfcd17a | 2008-08-06 15:12:22 +0200 | [diff] [blame] | 1184 | #if BITS_PER_LONG == 32 |
Steven Whitehouse | c2aca5e | 2009-01-20 10:29:45 +0000 | [diff] [blame] | 1185 | static inline int fcntl_getlk64(struct file *file, struct flock64 __user *user) |
| 1186 | { |
| 1187 | return -EINVAL; |
| 1188 | } |
| 1189 | |
| 1190 | static inline int fcntl_setlk64(unsigned int fd, struct file *file, |
| 1191 | unsigned int cmd, struct flock64 __user *user) |
| 1192 | { |
| 1193 | return -EACCES; |
| 1194 | } |
Thomas Petazzoni | bfcd17a | 2008-08-06 15:12:22 +0200 | [diff] [blame] | 1195 | #endif |
Steven Whitehouse | c2aca5e | 2009-01-20 10:29:45 +0000 | [diff] [blame] | 1196 | static inline int fcntl_setlease(unsigned int fd, struct file *filp, long arg) |
| 1197 | { |
| 1198 | return 0; |
| 1199 | } |
| 1200 | |
| 1201 | static inline int fcntl_getlease(struct file *filp) |
| 1202 | { |
| 1203 | return 0; |
| 1204 | } |
| 1205 | |
| 1206 | static inline void locks_init_lock(struct file_lock *fl) |
| 1207 | { |
| 1208 | return; |
| 1209 | } |
| 1210 | |
| 1211 | static inline void __locks_copy_lock(struct file_lock *new, struct file_lock *fl) |
| 1212 | { |
| 1213 | return; |
| 1214 | } |
| 1215 | |
| 1216 | static inline void locks_copy_lock(struct file_lock *new, struct file_lock *fl) |
| 1217 | { |
| 1218 | return; |
| 1219 | } |
| 1220 | |
| 1221 | static inline void locks_remove_posix(struct file *filp, fl_owner_t owner) |
| 1222 | { |
| 1223 | return; |
| 1224 | } |
| 1225 | |
| 1226 | static inline void locks_remove_flock(struct file *filp) |
| 1227 | { |
| 1228 | return; |
| 1229 | } |
| 1230 | |
| 1231 | static inline void posix_test_lock(struct file *filp, struct file_lock *fl) |
| 1232 | { |
| 1233 | return; |
| 1234 | } |
| 1235 | |
| 1236 | static inline int posix_lock_file(struct file *filp, struct file_lock *fl, |
| 1237 | struct file_lock *conflock) |
| 1238 | { |
| 1239 | return -ENOLCK; |
| 1240 | } |
| 1241 | |
| 1242 | static inline int posix_lock_file_wait(struct file *filp, struct file_lock *fl) |
| 1243 | { |
| 1244 | return -ENOLCK; |
| 1245 | } |
| 1246 | |
| 1247 | static inline int posix_unblock_lock(struct file *filp, |
| 1248 | struct file_lock *waiter) |
| 1249 | { |
| 1250 | return -ENOENT; |
| 1251 | } |
| 1252 | |
| 1253 | static inline int vfs_test_lock(struct file *filp, struct file_lock *fl) |
| 1254 | { |
| 1255 | return 0; |
| 1256 | } |
| 1257 | |
| 1258 | static inline int vfs_lock_file(struct file *filp, unsigned int cmd, |
| 1259 | struct file_lock *fl, struct file_lock *conf) |
| 1260 | { |
| 1261 | return -ENOLCK; |
| 1262 | } |
| 1263 | |
| 1264 | static inline int vfs_cancel_lock(struct file *filp, struct file_lock *fl) |
| 1265 | { |
| 1266 | return 0; |
| 1267 | } |
| 1268 | |
| 1269 | static inline int flock_lock_file_wait(struct file *filp, |
| 1270 | struct file_lock *request) |
| 1271 | { |
| 1272 | return -ENOLCK; |
| 1273 | } |
| 1274 | |
| 1275 | static inline int __break_lease(struct inode *inode, unsigned int mode) |
| 1276 | { |
| 1277 | return 0; |
| 1278 | } |
| 1279 | |
| 1280 | static inline void lease_get_mtime(struct inode *inode, struct timespec *time) |
| 1281 | { |
| 1282 | return; |
| 1283 | } |
| 1284 | |
| 1285 | static inline int generic_setlease(struct file *filp, long arg, |
| 1286 | struct file_lock **flp) |
| 1287 | { |
| 1288 | return -EINVAL; |
| 1289 | } |
| 1290 | |
| 1291 | static inline int vfs_setlease(struct file *filp, long arg, |
| 1292 | struct file_lock **lease) |
| 1293 | { |
| 1294 | return -EINVAL; |
| 1295 | } |
| 1296 | |
| 1297 | static inline int lease_modify(struct file_lock **before, int arg) |
| 1298 | { |
| 1299 | return -EINVAL; |
| 1300 | } |
| 1301 | |
| 1302 | static inline int lock_may_read(struct inode *inode, loff_t start, |
| 1303 | unsigned long len) |
| 1304 | { |
| 1305 | return 1; |
| 1306 | } |
| 1307 | |
| 1308 | static inline int lock_may_write(struct inode *inode, loff_t start, |
| 1309 | unsigned long len) |
| 1310 | { |
| 1311 | return 1; |
| 1312 | } |
| 1313 | |
Arnd Bergmann | b89f432 | 2010-09-18 15:09:31 +0200 | [diff] [blame] | 1314 | static inline void lock_flocks(void) |
| 1315 | { |
| 1316 | } |
| 1317 | |
| 1318 | static inline void unlock_flocks(void) |
| 1319 | { |
| 1320 | } |
| 1321 | |
Thomas Petazzoni | bfcd17a | 2008-08-06 15:12:22 +0200 | [diff] [blame] | 1322 | #endif /* !CONFIG_FILE_LOCKING */ |
| 1323 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1324 | |
| 1325 | struct fasync_struct { |
Eric Dumazet | 989a297 | 2010-04-14 09:55:35 +0000 | [diff] [blame] | 1326 | spinlock_t fa_lock; |
| 1327 | int magic; |
| 1328 | int fa_fd; |
| 1329 | struct fasync_struct *fa_next; /* singly linked list */ |
| 1330 | struct file *fa_file; |
| 1331 | struct rcu_head fa_rcu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1332 | }; |
| 1333 | |
| 1334 | #define FASYNC_MAGIC 0x4601 |
| 1335 | |
| 1336 | /* SMP safe fasync helpers: */ |
| 1337 | extern int fasync_helper(int, struct file *, int, struct fasync_struct **); |
Linus Torvalds | f7347ce | 2010-10-27 12:38:12 -0400 | [diff] [blame] | 1338 | extern struct fasync_struct *fasync_insert_entry(int, struct file *, struct fasync_struct **, struct fasync_struct *); |
| 1339 | extern int fasync_remove_entry(struct file *, struct fasync_struct **); |
| 1340 | extern struct fasync_struct *fasync_alloc(void); |
| 1341 | extern void fasync_free(struct fasync_struct *); |
| 1342 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1343 | /* can be called from interrupts */ |
| 1344 | extern void kill_fasync(struct fasync_struct **, int, int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1345 | |
Eric W. Biederman | 609d7fa | 2006-10-02 02:17:15 -0700 | [diff] [blame] | 1346 | 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] | 1347 | extern int f_setown(struct file *filp, unsigned long arg, int force); |
| 1348 | extern void f_delown(struct file *filp); |
Eric W. Biederman | 609d7fa | 2006-10-02 02:17:15 -0700 | [diff] [blame] | 1349 | extern pid_t f_getown(struct file *filp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1350 | extern int send_sigurg(struct fown_struct *fown); |
| 1351 | |
| 1352 | /* |
| 1353 | * Umount options |
| 1354 | */ |
| 1355 | |
| 1356 | #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */ |
| 1357 | #define MNT_DETACH 0x00000002 /* Just detach from the tree */ |
| 1358 | #define MNT_EXPIRE 0x00000004 /* Mark for expiry */ |
Miklos Szeredi | db1f05b | 2010-02-10 12:15:53 +0100 | [diff] [blame] | 1359 | #define UMOUNT_NOFOLLOW 0x00000008 /* Don't follow symlink on umount */ |
| 1360 | #define UMOUNT_UNUSED 0x80000000 /* Flag guaranteed to be unused */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1361 | |
| 1362 | extern struct list_head super_blocks; |
| 1363 | extern spinlock_t sb_lock; |
| 1364 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1365 | struct super_block { |
| 1366 | struct list_head s_list; /* Keep this first */ |
| 1367 | dev_t s_dev; /* search index; _not_ kdev_t */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1368 | unsigned char s_dirt; |
Richard Kennedy | 270ba5f | 2010-01-26 14:12:43 +0000 | [diff] [blame] | 1369 | unsigned char s_blocksize_bits; |
| 1370 | unsigned long s_blocksize; |
Jeff Layton | 42cb56a | 2009-09-18 13:05:53 -0700 | [diff] [blame] | 1371 | loff_t s_maxbytes; /* Max file size */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1372 | struct file_system_type *s_type; |
Josef 'Jeff' Sipek | ee9b6d6 | 2007-02-12 00:55:41 -0800 | [diff] [blame] | 1373 | const struct super_operations *s_op; |
Alexey Dobriyan | 61e225d | 2009-09-21 17:01:08 -0700 | [diff] [blame] | 1374 | const struct dquot_operations *dq_op; |
Alexey Dobriyan | 0d54b21 | 2009-09-21 17:01:09 -0700 | [diff] [blame] | 1375 | const struct quotactl_ops *s_qcop; |
Christoph Hellwig | 3965516 | 2007-10-21 16:42:17 -0700 | [diff] [blame] | 1376 | const struct export_operations *s_export_op; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1377 | unsigned long s_flags; |
| 1378 | unsigned long s_magic; |
| 1379 | struct dentry *s_root; |
| 1380 | struct rw_semaphore s_umount; |
Ingo Molnar | 7892f2f | 2006-01-09 15:59:25 -0800 | [diff] [blame] | 1381 | struct mutex s_lock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1382 | int s_count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1383 | atomic_t s_active; |
Alexey Dobriyan | 5046206 | 2006-09-29 02:00:01 -0700 | [diff] [blame] | 1384 | #ifdef CONFIG_SECURITY |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1385 | void *s_security; |
Alexey Dobriyan | 5046206 | 2006-09-29 02:00:01 -0700 | [diff] [blame] | 1386 | #endif |
Stephen Hemminger | bb43545 | 2010-05-13 17:53:14 -0700 | [diff] [blame] | 1387 | const struct xattr_handler **s_xattr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1388 | |
| 1389 | struct list_head s_inodes; /* all inodes */ |
Nick Piggin | ceb5bdc | 2011-01-07 17:50:05 +1100 | [diff] [blame] | 1390 | struct hlist_bl_head s_anon; /* anonymous dentries for (nfs) exporting */ |
Nick Piggin | 6416ccb | 2010-08-18 04:37:38 +1000 | [diff] [blame] | 1391 | #ifdef CONFIG_SMP |
| 1392 | struct list_head __percpu *s_files; |
| 1393 | #else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1394 | struct list_head s_files; |
Nick Piggin | 6416ccb | 2010-08-18 04:37:38 +1000 | [diff] [blame] | 1395 | #endif |
Nick Piggin | b5c84bf | 2011-01-07 17:49:38 +1100 | [diff] [blame] | 1396 | /* s_dentry_lru, s_nr_dentry_unused protected by dcache.c lru locks */ |
Kentaro Makita | da3bbdd | 2008-07-23 21:27:13 -0700 | [diff] [blame] | 1397 | struct list_head s_dentry_lru; /* unused dentry lru */ |
| 1398 | int s_nr_dentry_unused; /* # of dentry on lru */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1399 | |
Dave Chinner | 09cc9fc | 2011-07-08 14:14:40 +1000 | [diff] [blame^] | 1400 | /* s_inode_lru_lock protects s_inode_lru and s_nr_inodes_unused */ |
| 1401 | spinlock_t s_inode_lru_lock ____cacheline_aligned_in_smp; |
Dave Chinner | 98b745c | 2011-07-08 14:14:39 +1000 | [diff] [blame] | 1402 | struct list_head s_inode_lru; /* unused inode lru */ |
| 1403 | int s_nr_inodes_unused; /* # of inodes on lru */ |
| 1404 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1405 | struct block_device *s_bdev; |
Jens Axboe | 32a88aa | 2009-09-16 15:02:33 +0200 | [diff] [blame] | 1406 | struct backing_dev_info *s_bdi; |
David Howells | acaebfd | 2007-05-10 22:51:50 -0700 | [diff] [blame] | 1407 | struct mtd_info *s_mtd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1408 | struct list_head s_instances; |
| 1409 | struct quota_info s_dquot; /* Diskquota specific options */ |
| 1410 | |
| 1411 | int s_frozen; |
| 1412 | wait_queue_head_t s_wait_unfrozen; |
| 1413 | |
| 1414 | char s_id[32]; /* Informational name */ |
Linus Torvalds | 0bba016 | 2011-04-12 15:21:04 -0700 | [diff] [blame] | 1415 | u8 s_uuid[16]; /* UUID */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1416 | |
| 1417 | void *s_fs_info; /* Filesystem private info */ |
Al Viro | 30c40d2 | 2008-02-22 19:50:45 -0500 | [diff] [blame] | 1418 | fmode_t s_mode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1419 | |
Richard Kennedy | 270ba5f | 2010-01-26 14:12:43 +0000 | [diff] [blame] | 1420 | /* Granularity of c/m/atime in ns. |
| 1421 | Cannot be worse than a second */ |
| 1422 | u32 s_time_gran; |
| 1423 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1424 | /* |
| 1425 | * The next field is for VFS *only*. No filesystems have any business |
| 1426 | * even looking at it. You had been warned. |
| 1427 | */ |
Arjan van de Ven | a11f3a0 | 2006-03-23 03:00:33 -0800 | [diff] [blame] | 1428 | struct mutex s_vfs_rename_mutex; /* Kludge */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1429 | |
Miklos Szeredi | 79c0b2d | 2007-05-08 00:25:43 -0700 | [diff] [blame] | 1430 | /* |
| 1431 | * Filesystem subtype. If non-empty the filesystem type field |
| 1432 | * in /proc/mounts will be "type.subtype" |
| 1433 | */ |
| 1434 | char *s_subtype; |
Miklos Szeredi | b3b304a | 2008-02-08 04:21:35 -0800 | [diff] [blame] | 1435 | |
| 1436 | /* |
| 1437 | * Saved mount options for lazy filesystems using |
| 1438 | * generic_show_options() |
| 1439 | */ |
Arnd Bergmann | 4d2deb4 | 2010-02-24 20:01:56 +0100 | [diff] [blame] | 1440 | char __rcu *s_options; |
Al Viro | c8aebb0 | 2010-12-18 10:22:30 -0500 | [diff] [blame] | 1441 | const struct dentry_operations *s_d_op; /* default d_op for dentries */ |
Dan Magenheimer | 9fdfdcf | 2011-05-26 10:01:19 -0600 | [diff] [blame] | 1442 | |
| 1443 | /* |
| 1444 | * Saved pool identifier for cleancache (-1 means none) |
| 1445 | */ |
| 1446 | int cleancache_poolid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1447 | }; |
| 1448 | |
| 1449 | extern struct timespec current_fs_time(struct super_block *sb); |
| 1450 | |
| 1451 | /* |
| 1452 | * Snapshotting support. |
| 1453 | */ |
| 1454 | enum { |
| 1455 | SB_UNFROZEN = 0, |
| 1456 | SB_FREEZE_WRITE = 1, |
| 1457 | SB_FREEZE_TRANS = 2, |
| 1458 | }; |
| 1459 | |
| 1460 | #define vfs_check_frozen(sb, level) \ |
| 1461 | wait_event((sb)->s_wait_unfrozen, ((sb)->s_frozen < (level))) |
| 1462 | |
Al Viro | 914e263 | 2006-10-18 13:55:46 -0400 | [diff] [blame] | 1463 | #define get_fs_excl() atomic_inc(¤t->fs_excl) |
| 1464 | #define put_fs_excl() atomic_dec(¤t->fs_excl) |
| 1465 | #define has_fs_excl() atomic_read(¤t->fs_excl) |
Jens Axboe | 22e2c50 | 2005-06-27 10:55:12 +0200 | [diff] [blame] | 1466 | |
Serge E. Hallyn | e795b71 | 2011-03-23 16:43:25 -0700 | [diff] [blame] | 1467 | /* |
| 1468 | * until VFS tracks user namespaces for inodes, just make all files |
| 1469 | * belong to init_user_ns |
| 1470 | */ |
| 1471 | extern struct user_namespace init_user_ns; |
| 1472 | #define inode_userns(inode) (&init_user_ns) |
Serge E. Hallyn | 2e14967 | 2011-03-23 16:43:26 -0700 | [diff] [blame] | 1473 | extern bool inode_owner_or_capable(const struct inode *inode); |
Satyam Sharma | 3bd858a | 2007-07-17 15:00:08 +0530 | [diff] [blame] | 1474 | |
Al Viro | 914e263 | 2006-10-18 13:55:46 -0400 | [diff] [blame] | 1475 | /* not quite ready to be deprecated, but... */ |
| 1476 | extern void lock_super(struct super_block *); |
| 1477 | extern void unlock_super(struct super_block *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1478 | |
| 1479 | /* |
| 1480 | * VFS helper functions.. |
| 1481 | */ |
| 1482 | extern int vfs_create(struct inode *, struct dentry *, int, struct nameidata *); |
| 1483 | extern int vfs_mkdir(struct inode *, struct dentry *, int); |
| 1484 | extern int vfs_mknod(struct inode *, struct dentry *, int, dev_t); |
Miklos Szeredi | db2e747 | 2008-06-24 16:50:16 +0200 | [diff] [blame] | 1485 | extern int vfs_symlink(struct inode *, struct dentry *, const char *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1486 | extern int vfs_link(struct dentry *, struct inode *, struct dentry *); |
| 1487 | extern int vfs_rmdir(struct inode *, struct dentry *); |
| 1488 | extern int vfs_unlink(struct inode *, struct dentry *); |
| 1489 | extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *); |
| 1490 | |
| 1491 | /* |
| 1492 | * VFS dentry helper functions. |
| 1493 | */ |
| 1494 | extern void dentry_unhash(struct dentry *dentry); |
| 1495 | |
| 1496 | /* |
Christoph Hellwig | 8c744fb | 2005-11-08 21:35:04 -0800 | [diff] [blame] | 1497 | * VFS file helper functions. |
| 1498 | */ |
Dmitry Monakhov | a1bd120 | 2010-03-04 17:29:14 +0300 | [diff] [blame] | 1499 | extern void inode_init_owner(struct inode *inode, const struct inode *dir, |
| 1500 | mode_t mode); |
Christoph Hellwig | 8c744fb | 2005-11-08 21:35:04 -0800 | [diff] [blame] | 1501 | /* |
Mark Fasheh | c4b929b | 2008-10-08 19:44:18 -0400 | [diff] [blame] | 1502 | * VFS FS_IOC_FIEMAP helper definitions. |
| 1503 | */ |
| 1504 | struct fiemap_extent_info { |
| 1505 | unsigned int fi_flags; /* Flags as passed from user */ |
| 1506 | unsigned int fi_extents_mapped; /* Number of mapped extents */ |
| 1507 | unsigned int fi_extents_max; /* Size of fiemap_extent array */ |
Namhyung Kim | ecf5632 | 2011-01-16 23:28:17 +0900 | [diff] [blame] | 1508 | struct fiemap_extent __user *fi_extents_start; /* Start of |
| 1509 | fiemap_extent array */ |
Mark Fasheh | c4b929b | 2008-10-08 19:44:18 -0400 | [diff] [blame] | 1510 | }; |
| 1511 | int fiemap_fill_next_extent(struct fiemap_extent_info *info, u64 logical, |
| 1512 | u64 phys, u64 len, u32 flags); |
| 1513 | int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags); |
| 1514 | |
| 1515 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1516 | * File types |
| 1517 | * |
| 1518 | * NOTE! These match bits 12..15 of stat.st_mode |
| 1519 | * (ie "(i_mode >> 12) & 15"). |
| 1520 | */ |
| 1521 | #define DT_UNKNOWN 0 |
| 1522 | #define DT_FIFO 1 |
| 1523 | #define DT_CHR 2 |
| 1524 | #define DT_DIR 4 |
| 1525 | #define DT_BLK 6 |
| 1526 | #define DT_REG 8 |
| 1527 | #define DT_LNK 10 |
| 1528 | #define DT_SOCK 12 |
| 1529 | #define DT_WHT 14 |
| 1530 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1531 | /* |
| 1532 | * This is the "filldir" function type, used by readdir() to let |
| 1533 | * the kernel specify what kind of dirent layout it wants to have. |
| 1534 | * This allows the kernel to read directories into kernel space or |
| 1535 | * to have different dirent layouts depending on the binary type. |
| 1536 | */ |
David Howells | afefdbb | 2006-10-03 01:13:46 -0700 | [diff] [blame] | 1537 | typedef int (*filldir_t)(void *, const char *, int, loff_t, u64, unsigned); |
Al Viro | 08f8585 | 2007-10-08 13:26:20 -0400 | [diff] [blame] | 1538 | struct block_device_operations; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1539 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1540 | /* These macros are for out of kernel modules to test that |
| 1541 | * the kernel supports the unlocked_ioctl and compat_ioctl |
| 1542 | * fields in struct file_operations. */ |
| 1543 | #define HAVE_COMPAT_IOCTL 1 |
| 1544 | #define HAVE_UNLOCKED_IOCTL 1 |
| 1545 | |
| 1546 | /* |
| 1547 | * NOTE: |
Arnd Bergmann | b19dd42 | 2010-07-04 00:15:10 +0200 | [diff] [blame] | 1548 | * all file operations except setlease can be called without |
| 1549 | * the big kernel lock held in all filesystems. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1550 | */ |
| 1551 | struct file_operations { |
| 1552 | struct module *owner; |
| 1553 | loff_t (*llseek) (struct file *, loff_t, int); |
| 1554 | ssize_t (*read) (struct file *, char __user *, size_t, loff_t *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1555 | ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *); |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 1556 | ssize_t (*aio_read) (struct kiocb *, const struct iovec *, unsigned long, loff_t); |
| 1557 | 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] | 1558 | int (*readdir) (struct file *, void *, filldir_t); |
| 1559 | unsigned int (*poll) (struct file *, struct poll_table_struct *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1560 | long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long); |
| 1561 | long (*compat_ioctl) (struct file *, unsigned int, unsigned long); |
| 1562 | int (*mmap) (struct file *, struct vm_area_struct *); |
| 1563 | int (*open) (struct inode *, struct file *); |
Miklos Szeredi | 75e1fcc | 2006-06-23 02:05:12 -0700 | [diff] [blame] | 1564 | int (*flush) (struct file *, fl_owner_t id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1565 | int (*release) (struct inode *, struct file *); |
Christoph Hellwig | 7ea8085 | 2010-05-26 17:53:25 +0200 | [diff] [blame] | 1566 | int (*fsync) (struct file *, int datasync); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1567 | int (*aio_fsync) (struct kiocb *, int datasync); |
| 1568 | int (*fasync) (int, struct file *, int); |
| 1569 | int (*lock) (struct file *, int, struct file_lock *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1570 | ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int); |
| 1571 | unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); |
| 1572 | int (*check_flags)(int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1573 | int (*flock) (struct file *, int, struct file_lock *); |
Jens Axboe | cbb7e57 | 2006-04-11 14:57:50 +0200 | [diff] [blame] | 1574 | ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int); |
| 1575 | 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] | 1576 | int (*setlease)(struct file *, long, struct file_lock **); |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 1577 | long (*fallocate)(struct file *file, int mode, loff_t offset, |
| 1578 | loff_t len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1579 | }; |
| 1580 | |
| 1581 | struct inode_operations { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1582 | struct dentry * (*lookup) (struct inode *,struct dentry *, struct nameidata *); |
Nick Piggin | 44a7d7a | 2011-01-07 17:49:56 +1100 | [diff] [blame] | 1583 | void * (*follow_link) (struct dentry *, struct nameidata *); |
Al Viro | 10556cb | 2011-06-20 19:28:19 -0400 | [diff] [blame] | 1584 | int (*permission) (struct inode *, int); |
Al Viro | 7e40145 | 2011-06-20 19:12:17 -0400 | [diff] [blame] | 1585 | int (*check_acl)(struct inode *, int); |
Nick Piggin | 44a7d7a | 2011-01-07 17:49:56 +1100 | [diff] [blame] | 1586 | |
| 1587 | int (*readlink) (struct dentry *, char __user *,int); |
| 1588 | void (*put_link) (struct dentry *, struct nameidata *, void *); |
| 1589 | |
| 1590 | int (*create) (struct inode *,struct dentry *,int, struct nameidata *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1591 | int (*link) (struct dentry *,struct inode *,struct dentry *); |
| 1592 | int (*unlink) (struct inode *,struct dentry *); |
| 1593 | int (*symlink) (struct inode *,struct dentry *,const char *); |
| 1594 | int (*mkdir) (struct inode *,struct dentry *,int); |
| 1595 | int (*rmdir) (struct inode *,struct dentry *); |
| 1596 | int (*mknod) (struct inode *,struct dentry *,int,dev_t); |
| 1597 | int (*rename) (struct inode *, struct dentry *, |
| 1598 | struct inode *, struct dentry *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1599 | void (*truncate) (struct inode *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1600 | int (*setattr) (struct dentry *, struct iattr *); |
| 1601 | int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *); |
| 1602 | int (*setxattr) (struct dentry *, const char *,const void *,size_t,int); |
| 1603 | ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t); |
| 1604 | ssize_t (*listxattr) (struct dentry *, char *, size_t); |
| 1605 | int (*removexattr) (struct dentry *, const char *); |
Badari Pulavarty | f6b3ec2 | 2006-01-06 00:10:38 -0800 | [diff] [blame] | 1606 | void (*truncate_range)(struct inode *, loff_t, loff_t); |
Mark Fasheh | c4b929b | 2008-10-08 19:44:18 -0400 | [diff] [blame] | 1607 | int (*fiemap)(struct inode *, struct fiemap_extent_info *, u64 start, |
| 1608 | u64 len); |
Nick Piggin | 44a7d7a | 2011-01-07 17:49:56 +1100 | [diff] [blame] | 1609 | } ____cacheline_aligned; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1610 | |
| 1611 | struct seq_file; |
| 1612 | |
Badari Pulavarty | eed4e51 | 2006-09-30 23:28:49 -0700 | [diff] [blame] | 1613 | ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector, |
| 1614 | unsigned long nr_segs, unsigned long fast_segs, |
| 1615 | struct iovec *fast_pointer, |
| 1616 | struct iovec **ret_pointer); |
| 1617 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1618 | extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *); |
| 1619 | extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *); |
| 1620 | extern ssize_t vfs_readv(struct file *, const struct iovec __user *, |
| 1621 | unsigned long, loff_t *); |
| 1622 | extern ssize_t vfs_writev(struct file *, const struct iovec __user *, |
| 1623 | unsigned long, loff_t *); |
| 1624 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1625 | struct super_operations { |
| 1626 | struct inode *(*alloc_inode)(struct super_block *sb); |
| 1627 | void (*destroy_inode)(struct inode *); |
| 1628 | |
Christoph Hellwig | aa38572 | 2011-05-27 06:53:02 -0400 | [diff] [blame] | 1629 | void (*dirty_inode) (struct inode *, int flags); |
Christoph Hellwig | a9185b4 | 2010-03-05 09:21:37 +0100 | [diff] [blame] | 1630 | int (*write_inode) (struct inode *, struct writeback_control *wbc); |
Al Viro | 45321ac | 2010-06-07 13:43:19 -0400 | [diff] [blame] | 1631 | int (*drop_inode) (struct inode *); |
Al Viro | be7ce41 | 2010-06-04 19:40:39 -0400 | [diff] [blame] | 1632 | void (*evict_inode) (struct inode *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1633 | void (*put_super) (struct super_block *); |
| 1634 | void (*write_super) (struct super_block *); |
| 1635 | int (*sync_fs)(struct super_block *sb, int wait); |
Takashi Sato | c4be0c1 | 2009-01-09 16:40:58 -0800 | [diff] [blame] | 1636 | int (*freeze_fs) (struct super_block *); |
| 1637 | int (*unfreeze_fs) (struct super_block *); |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 1638 | int (*statfs) (struct dentry *, struct kstatfs *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1639 | int (*remount_fs) (struct super_block *, int *, char *); |
Al Viro | 42faad9 | 2008-04-24 07:21:56 -0400 | [diff] [blame] | 1640 | void (*umount_begin) (struct super_block *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1641 | |
| 1642 | int (*show_options)(struct seq_file *, struct vfsmount *); |
Al Viro | c7f404b | 2011-03-16 06:59:40 -0400 | [diff] [blame] | 1643 | int (*show_devname)(struct seq_file *, struct vfsmount *); |
| 1644 | int (*show_path)(struct seq_file *, struct vfsmount *); |
Chuck Lever | b4629fe | 2006-03-20 13:44:12 -0500 | [diff] [blame] | 1645 | int (*show_stats)(struct seq_file *, struct vfsmount *); |
Alexey Dobriyan | 0e51a72 | 2006-09-29 01:59:56 -0700 | [diff] [blame] | 1646 | #ifdef CONFIG_QUOTA |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1647 | ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t); |
| 1648 | 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] | 1649 | #endif |
Theodore Ts'o | 87d8fe1 | 2009-01-03 09:47:09 -0500 | [diff] [blame] | 1650 | 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] | 1651 | }; |
| 1652 | |
Joern Engel | 1c0eeaf | 2007-10-16 23:30:44 -0700 | [diff] [blame] | 1653 | /* |
Dave Chinner | 250df6e | 2011-03-22 22:23:36 +1100 | [diff] [blame] | 1654 | * Inode state bits. Protected by inode->i_lock |
Joern Engel | 1c0eeaf | 2007-10-16 23:30:44 -0700 | [diff] [blame] | 1655 | * |
| 1656 | * Three bits determine the dirty state of the inode, I_DIRTY_SYNC, |
| 1657 | * I_DIRTY_DATASYNC and I_DIRTY_PAGES. |
| 1658 | * |
| 1659 | * Four bits define the lifetime of an inode. Initially, inodes are I_NEW, |
| 1660 | * until that flag is cleared. I_WILL_FREE, I_FREEING and I_CLEAR are set at |
| 1661 | * various stages of removing an inode. |
| 1662 | * |
Christoph Hellwig | eaff807 | 2009-12-17 14:25:01 +0100 | [diff] [blame] | 1663 | * Two bits are used for locking and completion notification, I_NEW and I_SYNC. |
Joern Engel | 1c0eeaf | 2007-10-16 23:30:44 -0700 | [diff] [blame] | 1664 | * |
Joern Engel | e7ca2d4 | 2008-02-06 01:36:59 -0800 | [diff] [blame] | 1665 | * I_DIRTY_SYNC Inode is dirty, but doesn't have to be written on |
| 1666 | * fdatasync(). i_atime is the usual cause. |
Jan Kara | 000cb48 | 2008-02-14 19:31:32 -0800 | [diff] [blame] | 1667 | * I_DIRTY_DATASYNC Data-related inode changes pending. We keep track of |
| 1668 | * these changes separately from I_DIRTY_SYNC so that we |
| 1669 | * don't have to write inode on fdatasync() when only |
| 1670 | * mtime has changed in it. |
Joern Engel | 1c0eeaf | 2007-10-16 23:30:44 -0700 | [diff] [blame] | 1671 | * I_DIRTY_PAGES Inode has dirty pages. Inode itself may be clean. |
Christoph Hellwig | eaff807 | 2009-12-17 14:25:01 +0100 | [diff] [blame] | 1672 | * I_NEW Serves as both a mutex and completion notification. |
| 1673 | * New inodes set I_NEW. If two processes both create |
| 1674 | * the same inode, one of them will release its inode and |
| 1675 | * wait for I_NEW to be released before returning. |
| 1676 | * Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can |
| 1677 | * also cause waiting on I_NEW, without I_NEW actually |
| 1678 | * being set. find_inode() uses this to prevent returning |
| 1679 | * nearly-dead inodes. |
Joern Engel | 1c0eeaf | 2007-10-16 23:30:44 -0700 | [diff] [blame] | 1680 | * I_WILL_FREE Must be set when calling write_inode_now() if i_count |
| 1681 | * is zero. I_FREEING must be set when I_WILL_FREE is |
| 1682 | * cleared. |
| 1683 | * I_FREEING Set when inode is about to be freed but still has dirty |
| 1684 | * pages or buffers attached or the inode itself is still |
| 1685 | * dirty. |
Al Viro | b57922d | 2010-06-07 14:34:48 -0400 | [diff] [blame] | 1686 | * I_CLEAR Added by end_writeback(). In this state the inode is clean |
Al Viro | a4ffdde | 2010-06-02 17:38:30 -0400 | [diff] [blame] | 1687 | * and can be destroyed. Inode keeps I_FREEING. |
Joern Engel | 1c0eeaf | 2007-10-16 23:30:44 -0700 | [diff] [blame] | 1688 | * |
| 1689 | * Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are |
| 1690 | * prohibited for many purposes. iget() must wait for |
| 1691 | * the inode to be completely released, then create it |
| 1692 | * anew. Other functions will just ignore such inodes, |
Christoph Hellwig | eaff807 | 2009-12-17 14:25:01 +0100 | [diff] [blame] | 1693 | * if appropriate. I_NEW is used for waiting. |
Joern Engel | 1c0eeaf | 2007-10-16 23:30:44 -0700 | [diff] [blame] | 1694 | * |
Christoph Hellwig | eaff807 | 2009-12-17 14:25:01 +0100 | [diff] [blame] | 1695 | * I_SYNC Synchonized write of dirty inode data. The bits is |
| 1696 | * set during data writeback, and cleared with a wakeup |
| 1697 | * on the bit address once it is done. |
Joern Engel | 1c0eeaf | 2007-10-16 23:30:44 -0700 | [diff] [blame] | 1698 | * |
Joern Engel | 1c0eeaf | 2007-10-16 23:30:44 -0700 | [diff] [blame] | 1699 | * Q: What is the difference between I_WILL_FREE and I_FREEING? |
Joern Engel | 1c0eeaf | 2007-10-16 23:30:44 -0700 | [diff] [blame] | 1700 | */ |
Nick Piggin | 9e38d86 | 2010-10-23 06:55:17 -0400 | [diff] [blame] | 1701 | #define I_DIRTY_SYNC (1 << 0) |
| 1702 | #define I_DIRTY_DATASYNC (1 << 1) |
| 1703 | #define I_DIRTY_PAGES (1 << 2) |
Christoph Hellwig | eaff807 | 2009-12-17 14:25:01 +0100 | [diff] [blame] | 1704 | #define __I_NEW 3 |
| 1705 | #define I_NEW (1 << __I_NEW) |
Nick Piggin | 9e38d86 | 2010-10-23 06:55:17 -0400 | [diff] [blame] | 1706 | #define I_WILL_FREE (1 << 4) |
| 1707 | #define I_FREEING (1 << 5) |
| 1708 | #define I_CLEAR (1 << 6) |
Christoph Hellwig | eaff807 | 2009-12-17 14:25:01 +0100 | [diff] [blame] | 1709 | #define __I_SYNC 7 |
Joern Engel | 1c0eeaf | 2007-10-16 23:30:44 -0700 | [diff] [blame] | 1710 | #define I_SYNC (1 << __I_SYNC) |
Nick Piggin | 9e38d86 | 2010-10-23 06:55:17 -0400 | [diff] [blame] | 1711 | #define I_REFERENCED (1 << 8) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1712 | |
| 1713 | #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES) |
| 1714 | |
| 1715 | extern void __mark_inode_dirty(struct inode *, int); |
| 1716 | static inline void mark_inode_dirty(struct inode *inode) |
| 1717 | { |
| 1718 | __mark_inode_dirty(inode, I_DIRTY); |
| 1719 | } |
| 1720 | |
| 1721 | static inline void mark_inode_dirty_sync(struct inode *inode) |
| 1722 | { |
| 1723 | __mark_inode_dirty(inode, I_DIRTY_SYNC); |
| 1724 | } |
| 1725 | |
Dave Hansen | 71c4215 | 2007-06-23 17:16:42 -0700 | [diff] [blame] | 1726 | /** |
| 1727 | * inc_nlink - directly increment an inode's link count |
| 1728 | * @inode: inode |
| 1729 | * |
| 1730 | * This is a low-level filesystem helper to replace any |
| 1731 | * direct filesystem manipulation of i_nlink. Currently, |
| 1732 | * it is only here for parity with dec_nlink(). |
| 1733 | */ |
Dave Hansen | d8c76e6 | 2006-09-30 23:29:04 -0700 | [diff] [blame] | 1734 | static inline void inc_nlink(struct inode *inode) |
Alexey Dobriyan | 66d2173 | 2006-03-23 03:00:51 -0800 | [diff] [blame] | 1735 | { |
| 1736 | inode->i_nlink++; |
Dave Hansen | d8c76e6 | 2006-09-30 23:29:04 -0700 | [diff] [blame] | 1737 | } |
| 1738 | |
| 1739 | static inline void inode_inc_link_count(struct inode *inode) |
| 1740 | { |
| 1741 | inc_nlink(inode); |
Alexey Dobriyan | 66d2173 | 2006-03-23 03:00:51 -0800 | [diff] [blame] | 1742 | mark_inode_dirty(inode); |
| 1743 | } |
| 1744 | |
Dave Hansen | 71c4215 | 2007-06-23 17:16:42 -0700 | [diff] [blame] | 1745 | /** |
| 1746 | * drop_nlink - directly drop an inode's link count |
| 1747 | * @inode: inode |
| 1748 | * |
| 1749 | * This is a low-level filesystem helper to replace any |
| 1750 | * direct filesystem manipulation of i_nlink. In cases |
| 1751 | * where we are attempting to track writes to the |
| 1752 | * filesystem, a decrement to zero means an imminent |
| 1753 | * write when the file is truncated and actually unlinked |
| 1754 | * on the filesystem. |
| 1755 | */ |
Dave Hansen | 9a53c3a | 2006-09-30 23:29:03 -0700 | [diff] [blame] | 1756 | static inline void drop_nlink(struct inode *inode) |
Alexey Dobriyan | 66d2173 | 2006-03-23 03:00:51 -0800 | [diff] [blame] | 1757 | { |
| 1758 | inode->i_nlink--; |
Dave Hansen | 9a53c3a | 2006-09-30 23:29:03 -0700 | [diff] [blame] | 1759 | } |
| 1760 | |
Dave Hansen | 71c4215 | 2007-06-23 17:16:42 -0700 | [diff] [blame] | 1761 | /** |
| 1762 | * clear_nlink - directly zero an inode's link count |
| 1763 | * @inode: inode |
| 1764 | * |
| 1765 | * This is a low-level filesystem helper to replace any |
| 1766 | * direct filesystem manipulation of i_nlink. See |
| 1767 | * drop_nlink() for why we care about i_nlink hitting zero. |
| 1768 | */ |
Dave Hansen | ce71ec3 | 2006-09-30 23:29:06 -0700 | [diff] [blame] | 1769 | static inline void clear_nlink(struct inode *inode) |
| 1770 | { |
| 1771 | inode->i_nlink = 0; |
| 1772 | } |
| 1773 | |
Dave Hansen | 9a53c3a | 2006-09-30 23:29:03 -0700 | [diff] [blame] | 1774 | static inline void inode_dec_link_count(struct inode *inode) |
| 1775 | { |
| 1776 | drop_nlink(inode); |
Alexey Dobriyan | 66d2173 | 2006-03-23 03:00:51 -0800 | [diff] [blame] | 1777 | mark_inode_dirty(inode); |
| 1778 | } |
| 1779 | |
Jean Noel Cordenner | 25ec56b | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1780 | /** |
| 1781 | * inode_inc_iversion - increments i_version |
| 1782 | * @inode: inode that need to be updated |
| 1783 | * |
| 1784 | * Every time the inode is modified, the i_version field will be incremented. |
| 1785 | * The filesystem has to be mounted with i_version flag |
| 1786 | */ |
| 1787 | |
| 1788 | static inline void inode_inc_iversion(struct inode *inode) |
| 1789 | { |
| 1790 | spin_lock(&inode->i_lock); |
| 1791 | inode->i_version++; |
| 1792 | spin_unlock(&inode->i_lock); |
| 1793 | } |
| 1794 | |
Christoph Hellwig | 869243a | 2006-01-09 20:52:03 -0800 | [diff] [blame] | 1795 | extern void touch_atime(struct vfsmount *mnt, struct dentry *dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1796 | static inline void file_accessed(struct file *file) |
| 1797 | { |
| 1798 | if (!(file->f_flags & O_NOATIME)) |
Josef "Jeff" Sipek | 0f7fc9e | 2006-12-08 02:36:35 -0800 | [diff] [blame] | 1799 | touch_atime(file->f_path.mnt, file->f_path.dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1800 | } |
| 1801 | |
| 1802 | int sync_inode(struct inode *inode, struct writeback_control *wbc); |
Christoph Hellwig | c3765016 | 2010-10-06 10:48:20 +0200 | [diff] [blame] | 1803 | int sync_inode_metadata(struct inode *inode, int wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1804 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1805 | struct file_system_type { |
| 1806 | const char *name; |
| 1807 | int fs_flags; |
Al Viro | c96e41e | 2010-07-25 00:17:56 +0400 | [diff] [blame] | 1808 | struct dentry *(*mount) (struct file_system_type *, int, |
| 1809 | const char *, void *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1810 | void (*kill_sb) (struct super_block *); |
| 1811 | struct module *owner; |
| 1812 | struct file_system_type * next; |
| 1813 | struct list_head fs_supers; |
Peter Zijlstra | d475fd4 | 2007-10-15 14:51:31 +0200 | [diff] [blame] | 1814 | |
Ingo Molnar | cf51624 | 2006-07-03 00:25:27 -0700 | [diff] [blame] | 1815 | struct lock_class_key s_lock_key; |
Arjan van de Ven | 897c6ff | 2006-07-03 00:25:28 -0700 | [diff] [blame] | 1816 | struct lock_class_key s_umount_key; |
Roland Dreier | 51ee049 | 2010-04-27 14:23:57 -0700 | [diff] [blame] | 1817 | struct lock_class_key s_vfs_rename_key; |
Peter Zijlstra | d475fd4 | 2007-10-15 14:51:31 +0200 | [diff] [blame] | 1818 | |
| 1819 | struct lock_class_key i_lock_key; |
| 1820 | struct lock_class_key i_mutex_key; |
Peter Zijlstra | 14358e6 | 2007-10-14 01:38:33 +0200 | [diff] [blame] | 1821 | struct lock_class_key i_mutex_dir_key; |
Peter Zijlstra | d475fd4 | 2007-10-15 14:51:31 +0200 | [diff] [blame] | 1822 | struct lock_class_key i_alloc_sem_key; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1823 | }; |
| 1824 | |
Al Viro | ceefda6 | 2010-07-26 13:16:50 +0400 | [diff] [blame] | 1825 | extern struct dentry *mount_ns(struct file_system_type *fs_type, int flags, |
| 1826 | void *data, int (*fill_super)(struct super_block *, void *, int)); |
Al Viro | 152a083 | 2010-07-25 00:46:55 +0400 | [diff] [blame] | 1827 | extern struct dentry *mount_bdev(struct file_system_type *fs_type, |
| 1828 | int flags, const char *dev_name, void *data, |
| 1829 | int (*fill_super)(struct super_block *, void *, int)); |
Al Viro | fc14f2f | 2010-07-25 01:48:30 +0400 | [diff] [blame] | 1830 | extern struct dentry *mount_single(struct file_system_type *fs_type, |
| 1831 | int flags, void *data, |
| 1832 | int (*fill_super)(struct super_block *, void *, int)); |
Al Viro | 3c26ff6 | 2010-07-25 11:46:36 +0400 | [diff] [blame] | 1833 | extern struct dentry *mount_nodev(struct file_system_type *fs_type, |
| 1834 | int flags, void *data, |
| 1835 | int (*fill_super)(struct super_block *, void *, int)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1836 | void generic_shutdown_super(struct super_block *sb); |
| 1837 | void kill_block_super(struct super_block *sb); |
| 1838 | void kill_anon_super(struct super_block *sb); |
| 1839 | void kill_litter_super(struct super_block *sb); |
| 1840 | void deactivate_super(struct super_block *sb); |
Al Viro | 74dbbdd | 2009-05-06 01:07:50 -0400 | [diff] [blame] | 1841 | void deactivate_locked_super(struct super_block *sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1842 | int set_anon_super(struct super_block *s, void *data); |
Al Viro | 0ee5dc6 | 2011-07-07 15:44:25 -0400 | [diff] [blame] | 1843 | int get_anon_bdev(dev_t *); |
| 1844 | void free_anon_bdev(dev_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1845 | struct super_block *sget(struct file_system_type *type, |
| 1846 | int (*test)(struct super_block *,void *), |
| 1847 | int (*set)(struct super_block *,void *), |
| 1848 | void *data); |
Al Viro | 51139ad | 2010-07-25 23:47:46 +0400 | [diff] [blame] | 1849 | extern struct dentry *mount_pseudo(struct file_system_type *, char *, |
Al Viro | c74a1cb | 2011-01-12 16:59:34 -0500 | [diff] [blame] | 1850 | const struct super_operations *ops, |
| 1851 | const struct dentry_operations *dops, |
| 1852 | unsigned long); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1853 | |
Artem Bityutskiy | 140236b | 2010-06-10 13:56:33 +0300 | [diff] [blame] | 1854 | static inline void sb_mark_dirty(struct super_block *sb) |
| 1855 | { |
| 1856 | sb->s_dirt = 1; |
| 1857 | } |
| 1858 | static inline void sb_mark_clean(struct super_block *sb) |
| 1859 | { |
| 1860 | sb->s_dirt = 0; |
| 1861 | } |
| 1862 | static inline int sb_is_dirty(struct super_block *sb) |
| 1863 | { |
| 1864 | return sb->s_dirt; |
| 1865 | } |
| 1866 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1867 | /* Alas, no aliases. Too much hassle with bringing module.h everywhere */ |
| 1868 | #define fops_get(fops) \ |
| 1869 | (((fops) && try_module_get((fops)->owner) ? (fops) : NULL)) |
| 1870 | #define fops_put(fops) \ |
| 1871 | do { if (fops) module_put((fops)->owner); } while(0) |
| 1872 | |
| 1873 | extern int register_filesystem(struct file_system_type *); |
| 1874 | extern int unregister_filesystem(struct file_system_type *); |
Pavel Emelyanov | 8bf9725 | 2007-10-18 23:40:02 -0700 | [diff] [blame] | 1875 | extern struct vfsmount *kern_mount_data(struct file_system_type *, void *data); |
| 1876 | #define kern_mount(type) kern_mount_data(type, NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1877 | extern int may_umount_tree(struct vfsmount *); |
| 1878 | extern int may_umount(struct vfsmount *); |
| 1879 | extern long do_mount(char *, char *, char *, unsigned long, void *); |
Al Viro | 589ff87 | 2009-04-18 03:28:19 -0400 | [diff] [blame] | 1880 | extern struct vfsmount *collect_mounts(struct path *); |
Al Viro | 8aec080 | 2007-06-07 12:20:32 -0400 | [diff] [blame] | 1881 | extern void drop_collected_mounts(struct vfsmount *); |
Al Viro | 1f70713 | 2010-01-30 22:51:25 -0500 | [diff] [blame] | 1882 | extern int iterate_mounts(int (*)(struct vfsmount *, void *), void *, |
| 1883 | struct vfsmount *); |
Christoph Hellwig | ebabe9a | 2010-07-07 18:53:11 +0200 | [diff] [blame] | 1884 | extern int vfs_statfs(struct path *, struct kstatfs *); |
Al Viro | c8b91ac | 2011-03-12 10:41:39 -0500 | [diff] [blame] | 1885 | extern int user_statfs(const char __user *, struct kstatfs *); |
| 1886 | extern int fd_statfs(int, struct kstatfs *); |
Christoph Hellwig | ebabe9a | 2010-07-07 18:53:11 +0200 | [diff] [blame] | 1887 | extern int statfs_by_dentry(struct dentry *, struct kstatfs *); |
Josef Bacik | 18e9e51 | 2010-03-23 10:34:56 -0400 | [diff] [blame] | 1888 | extern int freeze_super(struct super_block *super); |
| 1889 | extern int thaw_super(struct super_block *super); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1890 | |
Al Viro | ce3b0f8 | 2009-03-29 19:08:22 -0400 | [diff] [blame] | 1891 | extern int current_umask(void); |
| 1892 | |
Miklos Szeredi | f87fd4c | 2006-01-16 22:14:23 -0800 | [diff] [blame] | 1893 | /* /sys/fs */ |
Greg Kroah-Hartman | 00d2666 | 2007-10-29 14:17:23 -0600 | [diff] [blame] | 1894 | extern struct kobject *fs_kobj; |
Miklos Szeredi | f87fd4c | 2006-01-16 22:14:23 -0800 | [diff] [blame] | 1895 | |
Linus Torvalds | 435f49a | 2010-10-29 10:36:49 -0700 | [diff] [blame] | 1896 | #define MAX_RW_COUNT (INT_MAX & PAGE_CACHE_MASK) |
Thomas Petazzoni | bfcd17a | 2008-08-06 15:12:22 +0200 | [diff] [blame] | 1897 | extern int rw_verify_area(int, struct file *, loff_t *, size_t); |
| 1898 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1899 | #define FLOCK_VERIFY_READ 1 |
| 1900 | #define FLOCK_VERIFY_WRITE 2 |
| 1901 | |
Thomas Petazzoni | bfcd17a | 2008-08-06 15:12:22 +0200 | [diff] [blame] | 1902 | #ifdef CONFIG_FILE_LOCKING |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1903 | extern int locks_mandatory_locked(struct inode *); |
| 1904 | extern int locks_mandatory_area(int, struct inode *, struct file *, loff_t, size_t); |
| 1905 | |
| 1906 | /* |
| 1907 | * Candidates for mandatory locking have the setgid bit set |
| 1908 | * but no group execute bit - an otherwise meaningless combination. |
| 1909 | */ |
Pavel Emelyanov | a16877c | 2007-10-01 14:41:11 -0700 | [diff] [blame] | 1910 | |
| 1911 | static inline int __mandatory_lock(struct inode *ino) |
| 1912 | { |
| 1913 | return (ino->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID; |
| 1914 | } |
| 1915 | |
| 1916 | /* |
| 1917 | * ... and these candidates should be on MS_MANDLOCK mounted fs, |
| 1918 | * otherwise these will be advisory locks |
| 1919 | */ |
| 1920 | |
| 1921 | static inline int mandatory_lock(struct inode *ino) |
| 1922 | { |
| 1923 | return IS_MANDLOCK(ino) && __mandatory_lock(ino); |
| 1924 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1925 | |
| 1926 | static inline int locks_verify_locked(struct inode *inode) |
| 1927 | { |
Pavel Emelyanov | a16877c | 2007-10-01 14:41:11 -0700 | [diff] [blame] | 1928 | if (mandatory_lock(inode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1929 | return locks_mandatory_locked(inode); |
| 1930 | return 0; |
| 1931 | } |
| 1932 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1933 | static inline int locks_verify_truncate(struct inode *inode, |
| 1934 | struct file *filp, |
| 1935 | loff_t size) |
| 1936 | { |
Pavel Emelyanov | a16877c | 2007-10-01 14:41:11 -0700 | [diff] [blame] | 1937 | if (inode->i_flock && mandatory_lock(inode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1938 | return locks_mandatory_area( |
| 1939 | FLOCK_VERIFY_WRITE, inode, filp, |
| 1940 | size < inode->i_size ? size : inode->i_size, |
| 1941 | (size < inode->i_size ? inode->i_size - size |
| 1942 | : size - inode->i_size) |
| 1943 | ); |
| 1944 | return 0; |
| 1945 | } |
| 1946 | |
| 1947 | static inline int break_lease(struct inode *inode, unsigned int mode) |
| 1948 | { |
| 1949 | if (inode->i_flock) |
| 1950 | return __break_lease(inode, mode); |
| 1951 | return 0; |
| 1952 | } |
Thomas Petazzoni | bfcd17a | 2008-08-06 15:12:22 +0200 | [diff] [blame] | 1953 | #else /* !CONFIG_FILE_LOCKING */ |
Steven Whitehouse | af5df56 | 2009-01-20 10:29:46 +0000 | [diff] [blame] | 1954 | static inline int locks_mandatory_locked(struct inode *inode) |
| 1955 | { |
| 1956 | return 0; |
| 1957 | } |
| 1958 | |
| 1959 | static inline int locks_mandatory_area(int rw, struct inode *inode, |
| 1960 | struct file *filp, loff_t offset, |
| 1961 | size_t count) |
| 1962 | { |
| 1963 | return 0; |
| 1964 | } |
| 1965 | |
| 1966 | static inline int __mandatory_lock(struct inode *inode) |
| 1967 | { |
| 1968 | return 0; |
| 1969 | } |
| 1970 | |
| 1971 | static inline int mandatory_lock(struct inode *inode) |
| 1972 | { |
| 1973 | return 0; |
| 1974 | } |
| 1975 | |
| 1976 | static inline int locks_verify_locked(struct inode *inode) |
| 1977 | { |
| 1978 | return 0; |
| 1979 | } |
| 1980 | |
| 1981 | static inline int locks_verify_truncate(struct inode *inode, struct file *filp, |
| 1982 | size_t size) |
| 1983 | { |
| 1984 | return 0; |
| 1985 | } |
| 1986 | |
| 1987 | static inline int break_lease(struct inode *inode, unsigned int mode) |
| 1988 | { |
| 1989 | return 0; |
| 1990 | } |
| 1991 | |
Thomas Petazzoni | bfcd17a | 2008-08-06 15:12:22 +0200 | [diff] [blame] | 1992 | #endif /* CONFIG_FILE_LOCKING */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1993 | |
| 1994 | /* fs/open.c */ |
| 1995 | |
NeilBrown | 4a30131 | 2006-01-08 01:02:39 -0800 | [diff] [blame] | 1996 | extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs, |
| 1997 | struct file *filp); |
Ankit Jain | 3e63cbb | 2009-06-19 14:28:07 -0400 | [diff] [blame] | 1998 | extern int do_fallocate(struct file *file, int mode, loff_t offset, |
| 1999 | loff_t len); |
Jason Uhlenkott | 8e8a140 | 2007-10-20 03:16:18 +0200 | [diff] [blame] | 2000 | 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] | 2001 | int mode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2002 | extern struct file *filp_open(const char *, int, int); |
Al Viro | 73d049a | 2011-03-11 12:08:24 -0500 | [diff] [blame] | 2003 | extern struct file *file_open_root(struct dentry *, struct vfsmount *, |
| 2004 | const char *, int); |
David Howells | 745ca24 | 2008-11-14 10:39:22 +1100 | [diff] [blame] | 2005 | extern struct file * dentry_open(struct dentry *, struct vfsmount *, int, |
| 2006 | const struct cred *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2007 | extern int filp_close(struct file *, fl_owner_t id); |
| 2008 | extern char * getname(const char __user *); |
| 2009 | |
Ankit Jain | 3e63cbb | 2009-06-19 14:28:07 -0400 | [diff] [blame] | 2010 | /* fs/ioctl.c */ |
| 2011 | |
| 2012 | extern int ioctl_preallocate(struct file *filp, void __user *argp); |
| 2013 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2014 | /* fs/dcache.c */ |
| 2015 | extern void __init vfs_caches_init_early(void); |
| 2016 | extern void __init vfs_caches_init(unsigned long); |
| 2017 | |
Christoph Lameter | b86c089 | 2006-12-06 20:32:57 -0800 | [diff] [blame] | 2018 | extern struct kmem_cache *names_cachep; |
| 2019 | |
Vegard Nossum | 3446a8a | 2009-05-16 11:22:14 +0200 | [diff] [blame] | 2020 | #define __getname_gfp(gfp) kmem_cache_alloc(names_cachep, (gfp)) |
| 2021 | #define __getname() __getname_gfp(GFP_KERNEL) |
| 2022 | #define __putname(name) kmem_cache_free(names_cachep, (void *)(name)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2023 | #ifndef CONFIG_AUDITSYSCALL |
| 2024 | #define putname(name) __putname(name) |
| 2025 | #else |
| 2026 | extern void putname(const char *name); |
| 2027 | #endif |
| 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 | extern int register_blkdev(unsigned int, const char *); |
Akinobu Mita | f448024 | 2007-07-17 04:03:47 -0700 | [diff] [blame] | 2031 | extern void unregister_blkdev(unsigned int, const char *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2032 | extern struct block_device *bdget(dev_t); |
Alan Jenkins | dddac6a | 2009-07-29 21:07:55 +0200 | [diff] [blame] | 2033 | extern struct block_device *bdgrab(struct block_device *bdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2034 | extern void bd_set_size(struct block_device *, loff_t size); |
| 2035 | extern void bd_forget(struct inode *inode); |
| 2036 | extern void bdput(struct block_device *); |
Nick Piggin | 585d3bc | 2009-02-25 10:44:19 +0100 | [diff] [blame] | 2037 | extern void invalidate_bdev(struct block_device *); |
| 2038 | extern int sync_blockdev(struct block_device *bdev); |
| 2039 | extern struct super_block *freeze_bdev(struct block_device *); |
Eric Sandeen | c2d7543 | 2009-03-31 15:23:46 -0700 | [diff] [blame] | 2040 | extern void emergency_thaw_all(void); |
Nick Piggin | 585d3bc | 2009-02-25 10:44:19 +0100 | [diff] [blame] | 2041 | extern int thaw_bdev(struct block_device *bdev, struct super_block *sb); |
| 2042 | extern int fsync_bdev(struct block_device *); |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2043 | #else |
| 2044 | static inline void bd_forget(struct inode *inode) {} |
Al Viro | 47e4491 | 2009-04-01 07:07:16 -0400 | [diff] [blame] | 2045 | static inline int sync_blockdev(struct block_device *bdev) { return 0; } |
| 2046 | static inline void invalidate_bdev(struct block_device *bdev) {} |
| 2047 | |
| 2048 | static inline struct super_block *freeze_bdev(struct block_device *sb) |
| 2049 | { |
| 2050 | return NULL; |
| 2051 | } |
| 2052 | |
| 2053 | static inline int thaw_bdev(struct block_device *bdev, struct super_block *sb) |
| 2054 | { |
| 2055 | return 0; |
| 2056 | } |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2057 | #endif |
Jan Kara | 60b0680 | 2009-04-27 16:43:53 +0200 | [diff] [blame] | 2058 | extern int sync_filesystem(struct super_block *); |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2059 | extern const struct file_operations def_blk_fops; |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 2060 | extern const struct file_operations def_chr_fops; |
| 2061 | extern const struct file_operations bad_sock_fops; |
| 2062 | extern const struct file_operations def_fifo_fops; |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2063 | #ifdef CONFIG_BLOCK |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2064 | extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long); |
Al Viro | 56b26ad | 2008-09-19 03:17:36 -0400 | [diff] [blame] | 2065 | extern int blkdev_ioctl(struct block_device *, fmode_t, unsigned, unsigned long); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2066 | extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long); |
Tejun Heo | e525fd8 | 2010-11-13 11:55:17 +0100 | [diff] [blame] | 2067 | extern int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder); |
Tejun Heo | d4d7762 | 2010-11-13 11:55:18 +0100 | [diff] [blame] | 2068 | extern struct block_device *blkdev_get_by_path(const char *path, fmode_t mode, |
| 2069 | void *holder); |
| 2070 | extern struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, |
| 2071 | void *holder); |
Tejun Heo | e525fd8 | 2010-11-13 11:55:17 +0100 | [diff] [blame] | 2072 | extern int blkdev_put(struct block_device *bdev, fmode_t mode); |
Jun'ichi Nomura | 641dc63 | 2006-03-27 01:17:57 -0800 | [diff] [blame] | 2073 | #ifdef CONFIG_SYSFS |
Tejun Heo | e09b457 | 2010-11-13 11:55:17 +0100 | [diff] [blame] | 2074 | extern int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk); |
Tejun Heo | 49731ba | 2011-01-14 18:43:57 +0100 | [diff] [blame] | 2075 | extern void bd_unlink_disk_holder(struct block_device *bdev, |
| 2076 | struct gendisk *disk); |
Jun'ichi Nomura | 641dc63 | 2006-03-27 01:17:57 -0800 | [diff] [blame] | 2077 | #else |
Tejun Heo | e09b457 | 2010-11-13 11:55:17 +0100 | [diff] [blame] | 2078 | static inline int bd_link_disk_holder(struct block_device *bdev, |
| 2079 | struct gendisk *disk) |
| 2080 | { |
| 2081 | return 0; |
| 2082 | } |
Tejun Heo | 49731ba | 2011-01-14 18:43:57 +0100 | [diff] [blame] | 2083 | static inline void bd_unlink_disk_holder(struct block_device *bdev, |
| 2084 | struct gendisk *disk) |
| 2085 | { |
| 2086 | } |
Jun'ichi Nomura | 641dc63 | 2006-03-27 01:17:57 -0800 | [diff] [blame] | 2087 | #endif |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2088 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2089 | |
| 2090 | /* fs/char_dev.c */ |
Joe Korty | 68eef3b | 2006-03-31 02:30:32 -0800 | [diff] [blame] | 2091 | #define CHRDEV_MAJOR_HASH_SIZE 255 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2092 | extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *); |
| 2093 | extern int register_chrdev_region(dev_t, unsigned, const char *); |
Tejun Heo | 1905b1b | 2009-08-06 18:13:23 +0900 | [diff] [blame] | 2094 | extern int __register_chrdev(unsigned int major, unsigned int baseminor, |
| 2095 | unsigned int count, const char *name, |
| 2096 | const struct file_operations *fops); |
| 2097 | extern void __unregister_chrdev(unsigned int major, unsigned int baseminor, |
| 2098 | unsigned int count, const char *name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2099 | extern void unregister_chrdev_region(dev_t, unsigned); |
Joe Korty | 68eef3b | 2006-03-31 02:30:32 -0800 | [diff] [blame] | 2100 | extern void chrdev_show(struct seq_file *,off_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2101 | |
Tejun Heo | 1905b1b | 2009-08-06 18:13:23 +0900 | [diff] [blame] | 2102 | static inline int register_chrdev(unsigned int major, const char *name, |
| 2103 | const struct file_operations *fops) |
| 2104 | { |
| 2105 | return __register_chrdev(major, 0, 256, name, fops); |
| 2106 | } |
| 2107 | |
| 2108 | static inline void unregister_chrdev(unsigned int major, const char *name) |
| 2109 | { |
| 2110 | __unregister_chrdev(major, 0, 256, name); |
| 2111 | } |
| 2112 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2113 | /* fs/block_dev.c */ |
| 2114 | #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */ |
Tejun Heo | 1f01429 | 2008-08-25 19:47:23 +0900 | [diff] [blame] | 2115 | #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */ |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2116 | |
| 2117 | #ifdef CONFIG_BLOCK |
| 2118 | #define BLKDEV_MAJOR_HASH_SIZE 255 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2119 | extern const char *__bdevname(dev_t, char *buffer); |
| 2120 | extern const char *bdevname(struct block_device *bdev, char *buffer); |
| 2121 | extern struct block_device *lookup_bdev(const char *); |
Joe Korty | 68eef3b | 2006-03-31 02:30:32 -0800 | [diff] [blame] | 2122 | extern void blkdev_show(struct seq_file *,off_t); |
Al Viro | 30c40d2 | 2008-02-22 19:50:45 -0500 | [diff] [blame] | 2123 | |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2124 | #else |
| 2125 | #define BLKDEV_MAJOR_HASH_SIZE 0 |
| 2126 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2127 | |
| 2128 | extern void init_special_inode(struct inode *, umode_t, dev_t); |
| 2129 | |
| 2130 | /* Invalid inode operations -- fs/bad_inode.c */ |
| 2131 | extern void make_bad_inode(struct inode *); |
| 2132 | extern int is_bad_inode(struct inode *); |
| 2133 | |
Denys Vlasenko | d2d9648 | 2008-07-01 14:16:09 +0200 | [diff] [blame] | 2134 | extern const struct file_operations read_pipefifo_fops; |
| 2135 | extern const struct file_operations write_pipefifo_fops; |
| 2136 | extern const struct file_operations rdwr_pipefifo_fops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2137 | |
| 2138 | extern int fs_may_remount_ro(struct super_block *); |
| 2139 | |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2140 | #ifdef CONFIG_BLOCK |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2141 | /* |
| 2142 | * return READ, READA, or WRITE |
| 2143 | */ |
| 2144 | #define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK)) |
| 2145 | |
| 2146 | /* |
| 2147 | * return data direction, READ or WRITE |
| 2148 | */ |
| 2149 | #define bio_data_dir(bio) ((bio)->bi_rw & 1) |
| 2150 | |
Andrew Patterson | c3279d1 | 2008-09-04 14:27:25 -0600 | [diff] [blame] | 2151 | extern void check_disk_size_change(struct gendisk *disk, |
| 2152 | struct block_device *bdev); |
Andrew Patterson | 0c002c2 | 2008-09-04 14:27:20 -0600 | [diff] [blame] | 2153 | extern int revalidate_disk(struct gendisk *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2154 | extern int check_disk_change(struct block_device *); |
NeilBrown | 93b270f | 2011-02-24 17:25:47 +1100 | [diff] [blame] | 2155 | extern int __invalidate_device(struct block_device *, bool); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2156 | extern int invalidate_partition(struct gendisk *, int); |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2157 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2158 | unsigned long invalidate_mapping_pages(struct address_space *mapping, |
| 2159 | pgoff_t start, pgoff_t end); |
Anton Altaparmakov | 54bc485 | 2007-02-10 01:45:38 -0800 | [diff] [blame] | 2160 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2161 | static inline void invalidate_remote_inode(struct inode *inode) |
| 2162 | { |
| 2163 | if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || |
| 2164 | S_ISLNK(inode->i_mode)) |
Andrew Morton | fc0ecff | 2007-02-10 01:45:39 -0800 | [diff] [blame] | 2165 | invalidate_mapping_pages(inode->i_mapping, 0, -1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2166 | } |
| 2167 | extern int invalidate_inode_pages2(struct address_space *mapping); |
| 2168 | extern int invalidate_inode_pages2_range(struct address_space *mapping, |
| 2169 | pgoff_t start, pgoff_t end); |
| 2170 | extern int write_inode_now(struct inode *, int); |
| 2171 | extern int filemap_fdatawrite(struct address_space *); |
| 2172 | extern int filemap_flush(struct address_space *); |
| 2173 | extern int filemap_fdatawait(struct address_space *); |
Jan Kara | d3bccb6f | 2009-08-17 19:30:27 +0200 | [diff] [blame] | 2174 | extern int filemap_fdatawait_range(struct address_space *, loff_t lstart, |
| 2175 | loff_t lend); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2176 | extern int filemap_write_and_wait(struct address_space *mapping); |
| 2177 | extern int filemap_write_and_wait_range(struct address_space *mapping, |
| 2178 | loff_t lstart, loff_t lend); |
Andrew Morton | ebcf28e | 2006-03-24 03:18:04 -0800 | [diff] [blame] | 2179 | extern int __filemap_fdatawrite_range(struct address_space *mapping, |
| 2180 | loff_t start, loff_t end, int sync_mode); |
Jan Kara | f4c0a0f | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 2181 | extern int filemap_fdatawrite_range(struct address_space *mapping, |
| 2182 | loff_t start, loff_t end); |
Andrew Morton | ebcf28e | 2006-03-24 03:18:04 -0800 | [diff] [blame] | 2183 | |
Christoph Hellwig | 8018ab0 | 2010-03-22 17:32:25 +0100 | [diff] [blame] | 2184 | extern int vfs_fsync_range(struct file *file, loff_t start, loff_t end, |
| 2185 | int datasync); |
| 2186 | extern int vfs_fsync(struct file *file, int datasync); |
Jan Kara | 148f948 | 2009-08-17 19:52:36 +0200 | [diff] [blame] | 2187 | extern int generic_write_sync(struct file *file, loff_t pos, loff_t count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2188 | extern void sync_supers(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2189 | extern void emergency_sync(void); |
| 2190 | extern void emergency_remount(void); |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2191 | #ifdef CONFIG_BLOCK |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2192 | extern sector_t bmap(struct inode *, sector_t); |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2193 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2194 | extern int notify_change(struct dentry *, struct iattr *); |
Al Viro | f419a2e | 2008-07-22 00:07:17 -0400 | [diff] [blame] | 2195 | extern int inode_permission(struct inode *, int); |
Al Viro | 2830ba7 | 2011-06-20 19:16:29 -0400 | [diff] [blame] | 2196 | extern int generic_permission(struct inode *, int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2197 | |
Miklos Szeredi | f696a36 | 2008-07-31 13:41:58 +0200 | [diff] [blame] | 2198 | static inline bool execute_ok(struct inode *inode) |
| 2199 | { |
| 2200 | return (inode->i_mode & S_IXUGO) || S_ISDIR(inode->i_mode); |
| 2201 | } |
| 2202 | |
Al Viro | 07b8ce1 | 2011-06-20 10:52:57 -0400 | [diff] [blame] | 2203 | /* |
| 2204 | * get_write_access() gets write permission for a file. |
| 2205 | * put_write_access() releases this write permission. |
| 2206 | * This is used for regular files. |
| 2207 | * We cannot support write (and maybe mmap read-write shared) accesses and |
| 2208 | * MAP_DENYWRITE mmappings simultaneously. The i_writecount field of an inode |
| 2209 | * can have the following values: |
| 2210 | * 0: no writers, no VM_DENYWRITE mappings |
| 2211 | * < 0: (-i_writecount) vm_area_structs with VM_DENYWRITE set exist |
| 2212 | * > 0: (i_writecount) users are writing to the file. |
| 2213 | * |
| 2214 | * Normally we operate on that counter with atomic_{inc,dec} and it's safe |
| 2215 | * except for the cases where we don't hold i_writecount yet. Then we need to |
| 2216 | * use {get,deny}_write_access() - these functions check the sign and refuse |
| 2217 | * to do the change if sign is wrong. |
| 2218 | */ |
| 2219 | static inline int get_write_access(struct inode *inode) |
| 2220 | { |
| 2221 | return atomic_inc_unless_negative(&inode->i_writecount) ? 0 : -ETXTBSY; |
| 2222 | } |
| 2223 | static inline int deny_write_access(struct file *file) |
| 2224 | { |
| 2225 | struct inode *inode = file->f_path.dentry->d_inode; |
| 2226 | return atomic_dec_unless_positive(&inode->i_writecount) ? 0 : -ETXTBSY; |
| 2227 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2228 | static inline void put_write_access(struct inode * inode) |
| 2229 | { |
| 2230 | atomic_dec(&inode->i_writecount); |
| 2231 | } |
| 2232 | static inline void allow_write_access(struct file *file) |
| 2233 | { |
| 2234 | if (file) |
Josef "Jeff" Sipek | 0f7fc9e | 2006-12-08 02:36:35 -0800 | [diff] [blame] | 2235 | atomic_inc(&file->f_path.dentry->d_inode->i_writecount); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2236 | } |
Mimi Zohar | a5c96eb | 2010-11-02 10:11:37 -0400 | [diff] [blame] | 2237 | #ifdef CONFIG_IMA |
| 2238 | static inline void i_readcount_dec(struct inode *inode) |
| 2239 | { |
| 2240 | BUG_ON(!atomic_read(&inode->i_readcount)); |
| 2241 | atomic_dec(&inode->i_readcount); |
| 2242 | } |
| 2243 | static inline void i_readcount_inc(struct inode *inode) |
| 2244 | { |
| 2245 | atomic_inc(&inode->i_readcount); |
| 2246 | } |
| 2247 | #else |
| 2248 | static inline void i_readcount_dec(struct inode *inode) |
| 2249 | { |
| 2250 | return; |
| 2251 | } |
| 2252 | static inline void i_readcount_inc(struct inode *inode) |
| 2253 | { |
| 2254 | return; |
| 2255 | } |
| 2256 | #endif |
Ulrich Drepper | ed8cae8 | 2008-07-23 21:29:30 -0700 | [diff] [blame] | 2257 | extern int do_pipe_flags(int *, int); |
Ulrich Drepper | be61a86 | 2008-07-23 21:29:40 -0700 | [diff] [blame] | 2258 | extern struct file *create_read_pipe(struct file *f, int flags); |
| 2259 | extern struct file *create_write_pipe(int flags); |
Andi Kleen | d6cbd28 | 2006-09-30 23:29:26 -0700 | [diff] [blame] | 2260 | extern void free_write_pipe(struct file *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2261 | |
Mimi Zohar | 6777d77 | 2009-08-21 14:32:48 -0400 | [diff] [blame] | 2262 | extern int kernel_read(struct file *, loff_t, char *, unsigned long); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2263 | extern struct file * open_exec(const char *); |
| 2264 | |
| 2265 | /* fs/dcache.c -- generic fs support functions */ |
| 2266 | extern int is_subdir(struct dentry *, struct dentry *); |
Al Viro | 2096f75 | 2010-01-30 13:16:21 -0500 | [diff] [blame] | 2267 | extern int path_is_under(struct path *, struct path *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2268 | extern ino_t find_inode_number(struct dentry *, struct qstr *); |
| 2269 | |
| 2270 | #include <linux/err.h> |
| 2271 | |
| 2272 | /* needed for stackable file system support */ |
| 2273 | extern loff_t default_llseek(struct file *file, loff_t offset, int origin); |
| 2274 | |
| 2275 | extern loff_t vfs_llseek(struct file *file, loff_t offset, int origin); |
| 2276 | |
Christoph Hellwig | 54e3462 | 2009-08-07 14:38:25 -0300 | [diff] [blame] | 2277 | extern int inode_init_always(struct super_block *, struct inode *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2278 | extern void inode_init_once(struct inode *); |
Miklos Szeredi | 2aa1589 | 2011-02-23 13:49:47 +0100 | [diff] [blame] | 2279 | extern void address_space_init_once(struct address_space *mapping); |
Al Viro | 7de9c6ee | 2010-10-23 11:11:40 -0400 | [diff] [blame] | 2280 | extern void ihold(struct inode * inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2281 | extern void iput(struct inode *); |
| 2282 | extern struct inode * igrab(struct inode *); |
| 2283 | extern ino_t iunique(struct super_block *, ino_t); |
| 2284 | extern int inode_needs_sync(struct inode *inode); |
Al Viro | 45321ac | 2010-06-07 13:43:19 -0400 | [diff] [blame] | 2285 | extern int generic_delete_inode(struct inode *inode); |
| 2286 | extern int generic_drop_inode(struct inode *inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2287 | |
Anton Altaparmakov | 88bd512 | 2005-07-13 01:10:44 -0700 | [diff] [blame] | 2288 | extern struct inode *ilookup5_nowait(struct super_block *sb, |
| 2289 | unsigned long hashval, int (*test)(struct inode *, void *), |
| 2290 | void *data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2291 | extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval, |
| 2292 | int (*test)(struct inode *, void *), void *data); |
| 2293 | extern struct inode *ilookup(struct super_block *sb, unsigned long ino); |
| 2294 | |
| 2295 | extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *); |
| 2296 | extern struct inode * iget_locked(struct super_block *, unsigned long); |
Al Viro | 261bca8 | 2008-12-30 01:48:21 -0500 | [diff] [blame] | 2297 | extern int insert_inode_locked4(struct inode *, unsigned long, int (*test)(struct inode *, void *), void *); |
| 2298 | extern int insert_inode_locked(struct inode *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2299 | extern void unlock_new_inode(struct inode *); |
Christoph Hellwig | 85fe402 | 2010-10-23 11:19:54 -0400 | [diff] [blame] | 2300 | extern unsigned int get_next_ino(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2301 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2302 | extern void __iget(struct inode * inode); |
David Howells | b46980f | 2008-02-07 00:15:27 -0800 | [diff] [blame] | 2303 | extern void iget_failed(struct inode *); |
Al Viro | b0683aa | 2010-06-04 20:55:25 -0400 | [diff] [blame] | 2304 | extern void end_writeback(struct inode *); |
Christoph Hellwig | 2e00c97 | 2009-08-07 14:38:29 -0300 | [diff] [blame] | 2305 | extern void __destroy_inode(struct inode *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2306 | extern struct inode *new_inode(struct super_block *); |
Nick Piggin | ff0c7d1 | 2011-01-07 17:49:50 +1100 | [diff] [blame] | 2307 | extern void free_inode_nonrcu(struct inode *inode); |
Jens Axboe | 01de85e | 2006-10-17 19:50:36 +0200 | [diff] [blame] | 2308 | extern int should_remove_suid(struct dentry *); |
Miklos Szeredi | 2f1936b | 2008-06-24 16:50:14 +0200 | [diff] [blame] | 2309 | extern int file_remove_suid(struct file *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2310 | |
| 2311 | extern void __insert_inode_hash(struct inode *, unsigned long hashval); |
| 2312 | extern void remove_inode_hash(struct inode *); |
Christoph Hellwig | 646ec46 | 2010-10-23 07:15:32 -0400 | [diff] [blame] | 2313 | static inline void insert_inode_hash(struct inode *inode) |
| 2314 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2315 | __insert_inode_hash(inode, inode->i_ino); |
| 2316 | } |
Christoph Hellwig | 646ec46 | 2010-10-23 07:15:32 -0400 | [diff] [blame] | 2317 | extern void inode_sb_list_add(struct inode *inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2318 | |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2319 | #ifdef CONFIG_BLOCK |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2320 | extern void submit_bio(int, struct bio *); |
| 2321 | extern int bdev_read_only(struct block_device *); |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2322 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2323 | extern int set_blocksize(struct block_device *, int); |
| 2324 | extern int sb_set_blocksize(struct super_block *, int); |
| 2325 | extern int sb_min_blocksize(struct super_block *, int); |
| 2326 | |
| 2327 | extern int generic_file_mmap(struct file *, struct vm_area_struct *); |
| 2328 | extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *); |
| 2329 | 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] | 2330 | 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] | 2331 | extern ssize_t generic_file_aio_read(struct kiocb *, const struct iovec *, unsigned long, loff_t); |
Jan Kara | e4dd9de | 2009-08-17 18:10:06 +0200 | [diff] [blame] | 2332 | extern ssize_t __generic_file_aio_write(struct kiocb *, const struct iovec *, unsigned long, |
| 2333 | loff_t *); |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 2334 | 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] | 2335 | extern ssize_t generic_file_direct_write(struct kiocb *, const struct iovec *, |
| 2336 | unsigned long *, loff_t, loff_t *, size_t, size_t); |
| 2337 | extern ssize_t generic_file_buffered_write(struct kiocb *, const struct iovec *, |
| 2338 | unsigned long, loff_t, loff_t *, size_t, ssize_t); |
| 2339 | extern ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos); |
| 2340 | 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] | 2341 | extern int generic_segment_checks(const struct iovec *iov, |
| 2342 | unsigned long *nr_segs, size_t *count, int access_flags); |
Andrew Morton | 88e6fae | 2006-04-11 13:59:36 +0200 | [diff] [blame] | 2343 | |
Christoph Hellwig | eef9938 | 2009-08-20 17:43:41 +0200 | [diff] [blame] | 2344 | /* fs/block_dev.c */ |
| 2345 | extern ssize_t blkdev_aio_write(struct kiocb *iocb, const struct iovec *iov, |
| 2346 | unsigned long nr_segs, loff_t pos); |
Christoph Hellwig | 7ea8085 | 2010-05-26 17:53:25 +0200 | [diff] [blame] | 2347 | extern int blkdev_fsync(struct file *filp, int datasync); |
Christoph Hellwig | eef9938 | 2009-08-20 17:43:41 +0200 | [diff] [blame] | 2348 | |
Andrew Morton | 88e6fae | 2006-04-11 13:59:36 +0200 | [diff] [blame] | 2349 | /* fs/splice.c */ |
Jens Axboe | cbb7e57 | 2006-04-11 14:57:50 +0200 | [diff] [blame] | 2350 | extern ssize_t generic_file_splice_read(struct file *, loff_t *, |
Andrew Morton | 88e6fae | 2006-04-11 13:59:36 +0200 | [diff] [blame] | 2351 | struct pipe_inode_info *, size_t, unsigned int); |
Miklos Szeredi | 6818173 | 2009-05-07 15:37:36 +0200 | [diff] [blame] | 2352 | extern ssize_t default_file_splice_read(struct file *, loff_t *, |
| 2353 | struct pipe_inode_info *, size_t, unsigned int); |
Andrew Morton | 88e6fae | 2006-04-11 13:59:36 +0200 | [diff] [blame] | 2354 | extern ssize_t generic_file_splice_write(struct pipe_inode_info *, |
Jens Axboe | cbb7e57 | 2006-04-11 14:57:50 +0200 | [diff] [blame] | 2355 | struct file *, loff_t *, size_t, unsigned int); |
Andrew Morton | 88e6fae | 2006-04-11 13:59:36 +0200 | [diff] [blame] | 2356 | extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe, |
Jens Axboe | cbb7e57 | 2006-04-11 14:57:50 +0200 | [diff] [blame] | 2357 | struct file *out, loff_t *, size_t len, unsigned int flags); |
| 2358 | 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] | 2359 | size_t len, unsigned int flags); |
| 2360 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2361 | extern void |
| 2362 | file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping); |
jan Blunck | ae6afc3 | 2010-05-26 14:44:48 -0700 | [diff] [blame] | 2363 | extern loff_t noop_llseek(struct file *file, loff_t offset, int origin); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2364 | extern loff_t no_llseek(struct file *file, loff_t offset, int origin); |
| 2365 | 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] | 2366 | extern loff_t generic_file_llseek_unlocked(struct file *file, loff_t offset, |
| 2367 | int origin); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2368 | extern int generic_file_open(struct inode * inode, struct file * filp); |
| 2369 | extern int nonseekable_open(struct inode * inode, struct file * filp); |
| 2370 | |
Carsten Otte | ceffc07 | 2005-06-23 22:05:25 -0700 | [diff] [blame] | 2371 | #ifdef CONFIG_FS_XIP |
Carsten Otte | eb6fe0c | 2005-06-23 22:05:28 -0700 | [diff] [blame] | 2372 | extern ssize_t xip_file_read(struct file *filp, char __user *buf, size_t len, |
| 2373 | loff_t *ppos); |
Carsten Otte | ceffc07 | 2005-06-23 22:05:25 -0700 | [diff] [blame] | 2374 | 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] | 2375 | extern ssize_t xip_file_write(struct file *filp, const char __user *buf, |
| 2376 | size_t len, loff_t *ppos); |
Carsten Otte | ceffc07 | 2005-06-23 22:05:25 -0700 | [diff] [blame] | 2377 | extern int xip_truncate_page(struct address_space *mapping, loff_t from); |
Carsten Otte | 6d79125 | 2005-06-23 22:05:26 -0700 | [diff] [blame] | 2378 | #else |
| 2379 | static inline int xip_truncate_page(struct address_space *mapping, loff_t from) |
| 2380 | { |
| 2381 | return 0; |
| 2382 | } |
Carsten Otte | ceffc07 | 2005-06-23 22:05:25 -0700 | [diff] [blame] | 2383 | #endif |
| 2384 | |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2385 | #ifdef CONFIG_BLOCK |
Josef Bacik | facd07b | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 2386 | typedef void (dio_submit_t)(int rw, struct bio *bio, struct inode *inode, |
| 2387 | loff_t file_offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2388 | |
| 2389 | enum { |
Christoph Hellwig | 1e431f5 | 2009-11-03 16:44:53 +0100 | [diff] [blame] | 2390 | /* need locking between buffered and direct access */ |
| 2391 | DIO_LOCKING = 0x01, |
| 2392 | |
| 2393 | /* filesystem does not support filling holes */ |
| 2394 | DIO_SKIP_HOLES = 0x02, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2395 | }; |
| 2396 | |
Christoph Hellwig | eafdc7d | 2010-06-04 11:29:53 +0200 | [diff] [blame] | 2397 | void dio_end_io(struct bio *bio, int error); |
npiggin@suse.de | 7bb46a6 | 2010-05-27 01:05:33 +1000 | [diff] [blame] | 2398 | |
Christoph Hellwig | eafdc7d | 2010-06-04 11:29:53 +0200 | [diff] [blame] | 2399 | ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode, |
| 2400 | struct block_device *bdev, const struct iovec *iov, loff_t offset, |
| 2401 | unsigned long nr_segs, get_block_t get_block, dio_iodone_t end_io, |
| 2402 | dio_submit_t submit_io, int flags); |
| 2403 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2404 | static inline ssize_t blockdev_direct_IO(int rw, struct kiocb *iocb, |
| 2405 | struct inode *inode, struct block_device *bdev, const struct iovec *iov, |
Badari Pulavarty | 1d8fa7a | 2006-03-26 01:38:02 -0800 | [diff] [blame] | 2406 | loff_t offset, unsigned long nr_segs, get_block_t get_block, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2407 | dio_iodone_t end_io) |
| 2408 | { |
| 2409 | return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset, |
Josef Bacik | facd07b | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 2410 | nr_segs, get_block, end_io, NULL, |
Christoph Hellwig | 1e431f5 | 2009-11-03 16:44:53 +0100 | [diff] [blame] | 2411 | DIO_LOCKING | DIO_SKIP_HOLES); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2412 | } |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 2413 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2414 | |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 2415 | extern const struct file_operations generic_ro_fops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2416 | |
| 2417 | #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m)) |
| 2418 | |
| 2419 | extern int vfs_readlink(struct dentry *, char __user *, int, const char *); |
| 2420 | extern int vfs_follow_link(struct nameidata *, const char *); |
| 2421 | extern int page_readlink(struct dentry *, char __user *, int); |
Linus Torvalds | cc314ee | 2005-08-19 18:02:56 -0700 | [diff] [blame] | 2422 | extern void *page_follow_link_light(struct dentry *, struct nameidata *); |
| 2423 | extern void page_put_link(struct dentry *, struct nameidata *, void *); |
Kirill Korotaev | 0adb25d | 2006-03-11 03:27:13 -0800 | [diff] [blame] | 2424 | extern int __page_symlink(struct inode *inode, const char *symname, int len, |
Nick Piggin | 54566b2 | 2009-01-04 12:00:53 -0800 | [diff] [blame] | 2425 | int nofs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2426 | 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] | 2427 | extern const struct inode_operations page_symlink_inode_operations; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2428 | extern int generic_readlink(struct dentry *, char __user *, int); |
| 2429 | extern void generic_fillattr(struct inode *, struct kstat *); |
| 2430 | extern int vfs_getattr(struct vfsmount *, struct dentry *, struct kstat *); |
Dmitry Monakhov | b462707 | 2009-12-14 15:21:12 +0300 | [diff] [blame] | 2431 | void __inode_add_bytes(struct inode *inode, loff_t bytes); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2432 | void inode_add_bytes(struct inode *inode, loff_t bytes); |
| 2433 | void inode_sub_bytes(struct inode *inode, loff_t bytes); |
| 2434 | loff_t inode_get_bytes(struct inode *inode); |
| 2435 | void inode_set_bytes(struct inode *inode, loff_t bytes); |
| 2436 | |
| 2437 | extern int vfs_readdir(struct file *, filldir_t, void *); |
| 2438 | |
David Howells | c788732 | 2010-08-11 11:26:22 +0100 | [diff] [blame] | 2439 | extern int vfs_stat(const char __user *, struct kstat *); |
| 2440 | extern int vfs_lstat(const char __user *, struct kstat *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2441 | extern int vfs_fstat(unsigned int, struct kstat *); |
David Howells | c788732 | 2010-08-11 11:26:22 +0100 | [diff] [blame] | 2442 | extern int vfs_fstatat(int , const char __user *, struct kstat *, int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2443 | |
Erez Zadok | deb21db | 2008-02-07 00:13:25 -0800 | [diff] [blame] | 2444 | extern int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd, |
| 2445 | unsigned long arg); |
Steven Whitehouse | e9079cc | 2008-10-14 14:43:29 +0100 | [diff] [blame] | 2446 | extern int __generic_block_fiemap(struct inode *inode, |
Josef Bacik | 3a3076f | 2010-04-23 12:17:17 -0400 | [diff] [blame] | 2447 | struct fiemap_extent_info *fieinfo, |
| 2448 | loff_t start, loff_t len, |
| 2449 | get_block_t *get_block); |
Josef Bacik | 68c9d70 | 2008-10-03 17:32:43 -0400 | [diff] [blame] | 2450 | extern int generic_block_fiemap(struct inode *inode, |
| 2451 | struct fiemap_extent_info *fieinfo, u64 start, |
| 2452 | u64 len, get_block_t *get_block); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2453 | |
Miklos Szeredi | c18479f | 2007-10-18 23:39:11 -0700 | [diff] [blame] | 2454 | extern void get_filesystem(struct file_system_type *fs); |
| 2455 | extern void put_filesystem(struct file_system_type *fs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2456 | extern struct file_system_type *get_fs_type(const char *name); |
| 2457 | extern struct super_block *get_super(struct block_device *); |
Christoph Hellwig | 4504230 | 2009-08-03 23:28:35 +0200 | [diff] [blame] | 2458 | extern struct super_block *get_active_super(struct block_device *bdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2459 | extern struct super_block *user_get_super(dev_t); |
| 2460 | extern void drop_super(struct super_block *sb); |
Al Viro | 01a05b3 | 2010-03-23 06:06:58 -0400 | [diff] [blame] | 2461 | extern void iterate_supers(void (*)(struct super_block *, void *), void *); |
Al Viro | 43e15cd | 2011-06-03 20:16:57 -0400 | [diff] [blame] | 2462 | extern void iterate_supers_type(struct file_system_type *, |
| 2463 | void (*)(struct super_block *, void *), void *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2464 | |
| 2465 | extern int dcache_dir_open(struct inode *, struct file *); |
| 2466 | extern int dcache_dir_close(struct inode *, struct file *); |
| 2467 | extern loff_t dcache_dir_lseek(struct file *, loff_t, int); |
| 2468 | extern int dcache_readdir(struct file *, void *, filldir_t); |
npiggin@suse.de | 7bb46a6 | 2010-05-27 01:05:33 +1000 | [diff] [blame] | 2469 | extern int simple_setattr(struct dentry *, struct iattr *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2470 | extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *); |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 2471 | extern int simple_statfs(struct dentry *, struct kstatfs *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2472 | extern int simple_link(struct dentry *, struct inode *, struct dentry *); |
| 2473 | extern int simple_unlink(struct inode *, struct dentry *); |
| 2474 | extern int simple_rmdir(struct inode *, struct dentry *); |
| 2475 | extern int simple_rename(struct inode *, struct dentry *, struct inode *, struct dentry *); |
Christoph Hellwig | 1b061d9 | 2010-05-26 17:53:41 +0200 | [diff] [blame] | 2476 | extern int noop_fsync(struct file *, int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2477 | extern int simple_empty(struct dentry *); |
| 2478 | extern int simple_readpage(struct file *file, struct page *page); |
Nick Piggin | afddba4 | 2007-10-16 01:25:01 -0700 | [diff] [blame] | 2479 | extern int simple_write_begin(struct file *file, struct address_space *mapping, |
| 2480 | loff_t pos, unsigned len, unsigned flags, |
| 2481 | struct page **pagep, void **fsdata); |
| 2482 | extern int simple_write_end(struct file *file, struct address_space *mapping, |
| 2483 | loff_t pos, unsigned len, unsigned copied, |
| 2484 | struct page *page, void *fsdata); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2485 | |
| 2486 | extern struct dentry *simple_lookup(struct inode *, struct dentry *, struct nameidata *); |
| 2487 | 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] | 2488 | extern const struct file_operations simple_dir_operations; |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 2489 | extern const struct inode_operations simple_dir_inode_operations; |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 2490 | struct tree_descr { char *name; const struct file_operations *ops; int mode; }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2491 | struct dentry *d_alloc_name(struct dentry *, const char *); |
Roberto Sassu | 7d683a0 | 2010-06-03 11:58:28 +0200 | [diff] [blame] | 2492 | extern int simple_fill_super(struct super_block *, unsigned long, struct tree_descr *); |
Trond Myklebust | 1f5ce9e | 2006-06-09 09:34:16 -0400 | [diff] [blame] | 2493 | 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] | 2494 | extern void simple_release_fs(struct vfsmount **mount, int *count); |
| 2495 | |
Akinobu Mita | 93b0711 | 2008-06-05 22:46:21 -0700 | [diff] [blame] | 2496 | extern ssize_t simple_read_from_buffer(void __user *to, size_t count, |
| 2497 | loff_t *ppos, const void *from, size_t available); |
Jiri Slaby | 6a727b4 | 2010-05-01 23:51:22 +0200 | [diff] [blame] | 2498 | extern ssize_t simple_write_to_buffer(void *to, size_t available, loff_t *ppos, |
| 2499 | const void __user *from, size_t count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2500 | |
Christoph Hellwig | 1b061d9 | 2010-05-26 17:53:41 +0200 | [diff] [blame] | 2501 | extern int generic_file_fsync(struct file *, int); |
Al Viro | d5aacad | 2009-06-07 14:56:44 -0400 | [diff] [blame] | 2502 | |
Patrick J. LoPresti | 30ca22c | 2010-07-22 15:03:41 -0700 | [diff] [blame] | 2503 | extern int generic_check_addressable(unsigned, u64); |
| 2504 | |
Christoph Lameter | e965f96 | 2006-02-01 03:05:41 -0800 | [diff] [blame] | 2505 | #ifdef CONFIG_MIGRATION |
Christoph Lameter | 2d1db3b | 2006-06-23 02:03:33 -0700 | [diff] [blame] | 2506 | extern int buffer_migrate_page(struct address_space *, |
| 2507 | struct page *, struct page *); |
Christoph Lameter | e965f96 | 2006-02-01 03:05:41 -0800 | [diff] [blame] | 2508 | #else |
| 2509 | #define buffer_migrate_page NULL |
| 2510 | #endif |
| 2511 | |
npiggin@suse.de | 25d9e2d | 2009-08-21 02:35:05 +1000 | [diff] [blame] | 2512 | extern int inode_change_ok(const struct inode *, struct iattr *); |
| 2513 | extern int inode_newsize_ok(const struct inode *, loff_t offset); |
Christoph Hellwig | 6a1a90a | 2010-06-04 11:30:00 +0200 | [diff] [blame] | 2514 | extern void setattr_copy(struct inode *inode, const struct iattr *attr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2515 | |
Christoph Hellwig | 870f481 | 2006-01-09 20:52:01 -0800 | [diff] [blame] | 2516 | extern void file_update_time(struct file *file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2517 | |
Miklos Szeredi | b3b304a | 2008-02-08 04:21:35 -0800 | [diff] [blame] | 2518 | extern int generic_show_options(struct seq_file *m, struct vfsmount *mnt); |
| 2519 | extern void save_mount_options(struct super_block *sb, char *options); |
Al Viro | 2a32ceb | 2009-05-08 16:05:57 -0400 | [diff] [blame] | 2520 | extern void replace_mount_options(struct super_block *sb, char *options); |
Miklos Szeredi | b3b304a | 2008-02-08 04:21:35 -0800 | [diff] [blame] | 2521 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2522 | static inline ino_t parent_ino(struct dentry *dentry) |
| 2523 | { |
| 2524 | ino_t res; |
| 2525 | |
Nick Piggin | b5c84bf | 2011-01-07 17:49:38 +1100 | [diff] [blame] | 2526 | /* |
| 2527 | * Don't strictly need d_lock here? If the parent ino could change |
| 2528 | * then surely we'd have a deeper race in the caller? |
| 2529 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2530 | spin_lock(&dentry->d_lock); |
| 2531 | res = dentry->d_parent->d_inode->i_ino; |
| 2532 | spin_unlock(&dentry->d_lock); |
| 2533 | return res; |
| 2534 | } |
| 2535 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2536 | /* Transaction based IO helpers */ |
| 2537 | |
| 2538 | /* |
| 2539 | * An argresp is stored in an allocated page and holds the |
| 2540 | * size of the argument or response, along with its content |
| 2541 | */ |
| 2542 | struct simple_transaction_argresp { |
| 2543 | ssize_t size; |
| 2544 | char data[0]; |
| 2545 | }; |
| 2546 | |
| 2547 | #define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp)) |
| 2548 | |
| 2549 | char *simple_transaction_get(struct file *file, const char __user *buf, |
| 2550 | size_t size); |
| 2551 | ssize_t simple_transaction_read(struct file *file, char __user *buf, |
| 2552 | size_t size, loff_t *pos); |
| 2553 | int simple_transaction_release(struct inode *inode, struct file *file); |
| 2554 | |
Ingo Molnar | 76791ab | 2009-03-25 16:48:35 +0100 | [diff] [blame] | 2555 | void simple_transaction_set(struct file *file, size_t n); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2556 | |
Arnd Bergmann | acaefc2 | 2005-05-18 14:40:59 +0200 | [diff] [blame] | 2557 | /* |
| 2558 | * simple attribute files |
| 2559 | * |
| 2560 | * These attributes behave similar to those in sysfs: |
| 2561 | * |
| 2562 | * Writing to an attribute immediately sets a value, an open file can be |
| 2563 | * written to multiple times. |
| 2564 | * |
| 2565 | * Reading from an attribute creates a buffer from the value that might get |
| 2566 | * read with multiple read calls. When the attribute has been read |
| 2567 | * completely, no further read calls are possible until the file is opened |
| 2568 | * again. |
| 2569 | * |
| 2570 | * All attributes contain a text representation of a numeric value |
| 2571 | * that are accessed with the get() and set() functions. |
| 2572 | */ |
| 2573 | #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \ |
| 2574 | static int __fops ## _open(struct inode *inode, struct file *file) \ |
| 2575 | { \ |
| 2576 | __simple_attr_check_format(__fmt, 0ull); \ |
| 2577 | return simple_attr_open(inode, file, __get, __set, __fmt); \ |
| 2578 | } \ |
Alexey Dobriyan | 828c095 | 2009-10-01 15:43:56 -0700 | [diff] [blame] | 2579 | static const struct file_operations __fops = { \ |
Arnd Bergmann | acaefc2 | 2005-05-18 14:40:59 +0200 | [diff] [blame] | 2580 | .owner = THIS_MODULE, \ |
| 2581 | .open = __fops ## _open, \ |
Christoph Hellwig | 74bedc4 | 2008-02-08 04:20:28 -0800 | [diff] [blame] | 2582 | .release = simple_attr_release, \ |
Arnd Bergmann | acaefc2 | 2005-05-18 14:40:59 +0200 | [diff] [blame] | 2583 | .read = simple_attr_read, \ |
| 2584 | .write = simple_attr_write, \ |
Arnd Bergmann | 1ec5584 | 2010-08-15 21:50:52 +0200 | [diff] [blame] | 2585 | .llseek = generic_file_llseek, \ |
Arnd Bergmann | acaefc2 | 2005-05-18 14:40:59 +0200 | [diff] [blame] | 2586 | }; |
| 2587 | |
| 2588 | static inline void __attribute__((format(printf, 1, 2))) |
| 2589 | __simple_attr_check_format(const char *fmt, ...) |
| 2590 | { |
| 2591 | /* don't do anything, just let the compiler check the arguments; */ |
| 2592 | } |
| 2593 | |
| 2594 | int simple_attr_open(struct inode *inode, struct file *file, |
Christoph Hellwig | 8b88b09 | 2008-02-08 04:20:26 -0800 | [diff] [blame] | 2595 | int (*get)(void *, u64 *), int (*set)(void *, u64), |
Arnd Bergmann | acaefc2 | 2005-05-18 14:40:59 +0200 | [diff] [blame] | 2596 | const char *fmt); |
Christoph Hellwig | 74bedc4 | 2008-02-08 04:20:28 -0800 | [diff] [blame] | 2597 | int simple_attr_release(struct inode *inode, struct file *file); |
Arnd Bergmann | acaefc2 | 2005-05-18 14:40:59 +0200 | [diff] [blame] | 2598 | ssize_t simple_attr_read(struct file *file, char __user *buf, |
| 2599 | size_t len, loff_t *ppos); |
| 2600 | ssize_t simple_attr_write(struct file *file, const char __user *buf, |
| 2601 | size_t len, loff_t *ppos); |
| 2602 | |
Alexey Dobriyan | 4be2854 | 2007-10-16 23:26:21 -0700 | [diff] [blame] | 2603 | struct ctl_table; |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 2604 | int proc_nr_files(struct ctl_table *table, int write, |
Adrian Bunk | 62239ac | 2007-07-17 04:03:45 -0700 | [diff] [blame] | 2605 | void __user *buffer, size_t *lenp, loff_t *ppos); |
Christoph Hellwig | 312d3ca | 2010-10-10 05:36:23 -0400 | [diff] [blame] | 2606 | int proc_nr_dentry(struct ctl_table *table, int write, |
| 2607 | void __user *buffer, size_t *lenp, loff_t *ppos); |
Dave Chinner | cffbc8a | 2010-10-23 05:03:02 -0400 | [diff] [blame] | 2608 | int proc_nr_inodes(struct ctl_table *table, int write, |
| 2609 | void __user *buffer, size_t *lenp, loff_t *ppos); |
Tetsuo Handa | 38e23c9 | 2009-04-09 20:17:52 +0900 | [diff] [blame] | 2610 | int __init get_filesystem_list(char *buf); |
Adrian Bunk | 62239ac | 2007-07-17 04:03:45 -0700 | [diff] [blame] | 2611 | |
Namhyung Kim | 3cd90ea | 2011-02-01 15:52:46 -0800 | [diff] [blame] | 2612 | #define __FMODE_EXEC ((__force int) FMODE_EXEC) |
Namhyung Kim | 1a44bc8 | 2011-02-01 15:52:46 -0800 | [diff] [blame] | 2613 | #define __FMODE_NONOTIFY ((__force int) FMODE_NONOTIFY) |
| 2614 | |
Al Viro | 6d12552 | 2009-12-24 06:58:56 -0500 | [diff] [blame] | 2615 | #define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE]) |
Eric Paris | ecf081d | 2009-12-17 21:24:25 -0500 | [diff] [blame] | 2616 | #define OPEN_FMODE(flag) ((__force fmode_t)(((flag + 1) & O_ACCMODE) | \ |
Namhyung Kim | 1a44bc8 | 2011-02-01 15:52:46 -0800 | [diff] [blame] | 2617 | (flag & __FMODE_NONOTIFY))) |
Al Viro | 5300990 | 2009-12-19 10:15:07 -0500 | [diff] [blame] | 2618 | |
Andi Kleen | 69b4573 | 2011-05-28 08:25:51 -0700 | [diff] [blame] | 2619 | static inline int is_sxid(mode_t mode) |
| 2620 | { |
| 2621 | return (mode & S_ISUID) || ((mode & S_ISGID) && (mode & S_IXGRP)); |
| 2622 | } |
| 2623 | |
| 2624 | static inline void inode_has_no_xattr(struct inode *inode) |
| 2625 | { |
Al Viro | 9e1f1de | 2011-06-03 18:24:58 -0400 | [diff] [blame] | 2626 | if (!is_sxid(inode->i_mode) && (inode->i_sb->s_flags & MS_NOSEC)) |
Andi Kleen | 69b4573 | 2011-05-28 08:25:51 -0700 | [diff] [blame] | 2627 | inode->i_flags |= S_NOSEC; |
| 2628 | } |
| 2629 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2630 | #endif /* __KERNEL__ */ |
| 2631 | #endif /* _LINUX_FS_H */ |