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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#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 Torvalds1da177e2005-04-16 15:20:36 -07009#include <linux/limits.h>
10#include <linux/ioctl.h>
11
12/*
13 * It's silly to have NR_OPEN bigger than NR_FILE, but you can change
14 * the file limit at runtime and only root can increase the per-process
15 * nr_file rlimit, so it's safe to set up a ridiculously high absolute
16 * upper limit on files-per-process.
17 *
18 * Some programs (notably those using select()) may have to be
19 * recompiled to take full advantage of the new limits..
20 */
21
22/* Fixed constants first: */
23#undef NR_OPEN
Eric Dumazet9cfe0152008-02-06 01:37:16 -080024extern int sysctl_nr_open;
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#define INR_OPEN 1024 /* Initial setting for nfile rlimits */
26
27#define BLOCK_SIZE_BITS 10
28#define BLOCK_SIZE (1<<BLOCK_SIZE_BITS)
29
David Howells01bf4662006-07-10 04:44:53 -070030#define SEEK_SET 0 /* seek relative to beginning of file */
31#define SEEK_CUR 1 /* seek relative to current file position */
32#define SEEK_END 2 /* seek relative to end of file */
Chris Snook1ae70752007-05-08 00:24:15 -070033#define SEEK_MAX SEEK_END
David Howells01bf4662006-07-10 04:44:53 -070034
Linus Torvalds1da177e2005-04-16 15:20:36 -070035/* And dynamically-tunable limits and defaults: */
36struct files_stat_struct {
37 int nr_files; /* read only */
38 int nr_free_files; /* read only */
39 int max_files; /* tunable */
40};
41extern struct files_stat_struct files_stat;
Dipankar Sarma529bf6b2006-03-07 21:55:35 -080042extern int get_max_files(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -070043
44struct inodes_stat_t {
45 int nr_inodes;
46 int nr_unused;
Stefan Richter9e7bf242007-07-15 23:40:25 -070047 int dummy[5]; /* padding for sysctl ABI compatibility */
Linus Torvalds1da177e2005-04-16 15:20:36 -070048};
49extern struct inodes_stat_t inodes_stat;
50
51extern int leases_enable, lease_break_time;
52
53#ifdef CONFIG_DNOTIFY
54extern int dir_notify_enable;
55#endif
56
57#define NR_FILE 8192 /* this can well be larger on a larger system */
58
59#define MAY_EXEC 1
60#define MAY_WRITE 2
61#define MAY_READ 4
62#define MAY_APPEND 8
63
64#define FMODE_READ 1
65#define FMODE_WRITE 2
66
67/* Internal kernel extensions */
68#define FMODE_LSEEK 4
69#define FMODE_PREAD 8
70#define FMODE_PWRITE FMODE_PREAD /* These go hand in hand */
71
Oleg Drokinb5005312006-03-25 03:07:01 -080072/* File is being opened for execution. Primary users of this flag are
73 distributed filesystems that can use it to achieve correct ETXTBUSY
74 behavior for cross-node execution/opening_for_writing of files */
75#define FMODE_EXEC 16
76
Linus Torvalds1da177e2005-04-16 15:20:36 -070077#define RW_MASK 1
78#define RWA_MASK 2
79#define READ 0
80#define WRITE 1
81#define READA 2 /* read-ahead - don't block if no resources */
Jan Karaa7662232005-09-06 15:19:10 -070082#define SWRITE 3 /* for ll_rw_block() - wait for buffer lock */
Linus Torvalds1da177e2005-04-16 15:20:36 -070083#define READ_SYNC (READ | (1 << BIO_RW_SYNC))
Jens Axboe5404bc72006-08-10 09:01:02 +020084#define READ_META (READ | (1 << BIO_RW_META))
Linus Torvalds1da177e2005-04-16 15:20:36 -070085#define WRITE_SYNC (WRITE | (1 << BIO_RW_SYNC))
Jens Axboe18ce3752008-07-01 09:07:34 +020086#define SWRITE_SYNC (SWRITE | (1 << BIO_RW_SYNC))
Linus Torvalds1da177e2005-04-16 15:20:36 -070087#define WRITE_BARRIER ((1 << BIO_RW) | (1 << BIO_RW_BARRIER))
88
89#define SEL_IN 1
90#define SEL_OUT 2
91#define SEL_EX 4
92
93/* public flags for file_system_type */
94#define FS_REQUIRES_DEV 1
95#define FS_BINARY_MOUNTDATA 2
Miklos Szeredi79c0b2d2007-05-08 00:25:43 -070096#define FS_HAS_SUBTYPE 4
Linus Torvalds1da177e2005-04-16 15:20:36 -070097#define FS_REVAL_DOT 16384 /* Check the paths ".", ".." for staleness */
Mark Fasheh349457c2006-09-08 14:22:21 -070098#define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move()
99 * during rename() internally.
100 */
101
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102/*
103 * These are the fs-independent mount-flags: up to 32 flags are supported
104 */
105#define MS_RDONLY 1 /* Mount read-only */
106#define MS_NOSUID 2 /* Ignore suid and sgid bits */
107#define MS_NODEV 4 /* Disallow access to device special files */
108#define MS_NOEXEC 8 /* Disallow program execution */
109#define MS_SYNCHRONOUS 16 /* Writes are synced at once */
110#define MS_REMOUNT 32 /* Alter flags of a mounted FS */
111#define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */
112#define MS_DIRSYNC 128 /* Directory modifications are synchronous */
113#define MS_NOATIME 1024 /* Do not update access times. */
114#define MS_NODIRATIME 2048 /* Do not update directory access times */
115#define MS_BIND 4096
116#define MS_MOVE 8192
117#define MS_REC 16384
Theodore Ts'o9b04c992006-03-24 03:15:10 -0800118#define MS_VERBOSE 32768 /* War is peace. Verbosity is silence.
119 MS_VERBOSE is deprecated. */
120#define MS_SILENT 32768
Miklos Szeredibf066c72006-01-08 01:03:19 -0800121#define MS_POSIXACL (1<<16) /* VFS does not apply the umask */
Ram Pai9676f0c2005-11-07 17:21:20 -0500122#define MS_UNBINDABLE (1<<17) /* change to unbindable */
Ram Pai07b20882005-11-07 17:19:07 -0500123#define MS_PRIVATE (1<<18) /* change to private */
Ram Paia58b0eb2005-11-07 17:20:48 -0500124#define MS_SLAVE (1<<19) /* change to slave */
Ram Pai03e06e62005-11-07 17:19:33 -0500125#define MS_SHARED (1<<20) /* change to shared */
Valerie Henson47ae32d2006-12-13 00:34:34 -0800126#define MS_RELATIME (1<<21) /* Update atime relative to mtime/ctime. */
Pavel Emelyanov8bf97252007-10-18 23:40:02 -0700127#define MS_KERNMOUNT (1<<22) /* this is a kern_mount call */
Jean Noel Cordenner7a224222008-01-28 23:58:27 -0500128#define MS_I_VERSION (1<<23) /* Update inode I_version field */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129#define MS_ACTIVE (1<<30)
130#define MS_NOUSER (1<<31)
131
132/*
133 * Superblock flags that can be altered by MS_REMOUNT
134 */
Christoph Hellwigfc33a7b2006-01-09 20:52:17 -0800135#define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136
137/*
138 * Old magic mount flag and mask
139 */
140#define MS_MGC_VAL 0xC0ED0000
141#define MS_MGC_MSK 0xffff0000
142
143/* Inode flags - they have nothing to superblock flags now */
144
145#define S_SYNC 1 /* Writes are synced at once */
146#define S_NOATIME 2 /* Do not update access times */
147#define S_APPEND 4 /* Append-only file */
148#define S_IMMUTABLE 8 /* Immutable file */
149#define S_DEAD 16 /* removed, but still open directory */
150#define S_NOQUOTA 32 /* Inode is not counted to quota */
151#define S_DIRSYNC 64 /* Directory modifications are synchronous */
152#define S_NOCMTIME 128 /* Do not update file c/mtime */
153#define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */
154#define S_PRIVATE 512 /* Inode is fs-internal */
155
156/*
157 * Note that nosuid etc flags are inode-specific: setting some file-system
158 * flags just means all the inodes inherit those flags by default. It might be
159 * possible to override it selectively if you really wanted to with some
160 * ioctl() that is not currently implemented.
161 *
162 * Exception: MS_RDONLY is always applied to the entire file system.
163 *
164 * Unfortunately, it is possible to change a filesystems flags with it mounted
165 * with files in use. This means that all of the inodes will not have their
166 * i_flags updated. Hence, i_flags no longer inherit the superblock mount
167 * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
168 */
169#define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg))
170
171#define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY)
172#define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \
173 ((inode)->i_flags & S_SYNC))
174#define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \
175 ((inode)->i_flags & (S_SYNC|S_DIRSYNC)))
176#define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK)
Eric Dumazet37756ce2007-02-10 01:44:49 -0800177#define IS_NOATIME(inode) __IS_FLG(inode, MS_RDONLY|MS_NOATIME)
Jean Noel Cordenner7a224222008-01-28 23:58:27 -0500178#define IS_I_VERSION(inode) __IS_FLG(inode, MS_I_VERSION)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179
180#define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA)
181#define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
182#define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183#define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL)
184
185#define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD)
186#define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME)
187#define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE)
188#define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE)
189
190/* the read-only stuff doesn't really belong here, but any other place is
191 probably as bad and I don't want to create yet another include file. */
192
193#define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */
194#define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */
195#define BLKRRPART _IO(0x12,95) /* re-read partition table */
196#define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */
197#define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */
198#define BLKRASET _IO(0x12,98) /* set read ahead for block device */
199#define BLKRAGET _IO(0x12,99) /* get current read ahead setting */
200#define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */
201#define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */
202#define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */
203#define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */
204#define BLKSSZGET _IO(0x12,104)/* get block device sector size */
205#if 0
206#define BLKPG _IO(0x12,105)/* See blkpg.h */
207
208/* Some people are morons. Do not use sizeof! */
209
210#define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */
211#define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */
212/* This was here just to show that the number is taken -
213 probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */
214#endif
215/* A jump here: 108-111 have been used for various private purposes. */
216#define BLKBSZGET _IOR(0x12,112,size_t)
217#define BLKBSZSET _IOW(0x12,113,size_t)
218#define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
Jens Axboe2056a782006-03-23 20:00:26 +0100219#define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup)
220#define BLKTRACESTART _IO(0x12,116)
221#define BLKTRACESTOP _IO(0x12,117)
222#define BLKTRACETEARDOWN _IO(0x12,118)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223
224#define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
225#define FIBMAP _IO(0x00,1) /* bmap access */
226#define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */
227
David Howells36695672006-08-29 19:06:16 +0100228#define FS_IOC_GETFLAGS _IOR('f', 1, long)
229#define FS_IOC_SETFLAGS _IOW('f', 2, long)
230#define FS_IOC_GETVERSION _IOR('v', 1, long)
231#define FS_IOC_SETVERSION _IOW('v', 2, long)
232#define FS_IOC32_GETFLAGS _IOR('f', 1, int)
233#define FS_IOC32_SETFLAGS _IOW('f', 2, int)
234#define FS_IOC32_GETVERSION _IOR('v', 1, int)
235#define FS_IOC32_SETVERSION _IOW('v', 2, int)
236
237/*
238 * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS)
239 */
240#define FS_SECRM_FL 0x00000001 /* Secure deletion */
241#define FS_UNRM_FL 0x00000002 /* Undelete */
242#define FS_COMPR_FL 0x00000004 /* Compress file */
243#define FS_SYNC_FL 0x00000008 /* Synchronous updates */
244#define FS_IMMUTABLE_FL 0x00000010 /* Immutable file */
245#define FS_APPEND_FL 0x00000020 /* writes to file may only append */
246#define FS_NODUMP_FL 0x00000040 /* do not dump file */
247#define FS_NOATIME_FL 0x00000080 /* do not update atime */
248/* Reserved for compression usage... */
249#define FS_DIRTY_FL 0x00000100
250#define FS_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
251#define FS_NOCOMP_FL 0x00000400 /* Don't compress */
252#define FS_ECOMPR_FL 0x00000800 /* Compression error */
253/* End compression flags --- maybe not all used */
254#define FS_BTREE_FL 0x00001000 /* btree format dir */
255#define FS_INDEX_FL 0x00001000 /* hash-indexed directory */
256#define FS_IMAGIC_FL 0x00002000 /* AFS directory */
257#define FS_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */
258#define FS_NOTAIL_FL 0x00008000 /* file tail should not be merged */
259#define FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
260#define FS_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400261#define FS_EXTENT_FL 0x00080000 /* Extents */
262#define FS_DIRECTIO_FL 0x00100000 /* Use direct i/o */
David Howells36695672006-08-29 19:06:16 +0100263#define FS_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
264
265#define FS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */
266#define FS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
267
268
Andrew Mortone46e4902006-05-22 22:35:24 -0700269#define SYNC_FILE_RANGE_WAIT_BEFORE 1
270#define SYNC_FILE_RANGE_WRITE 2
271#define SYNC_FILE_RANGE_WAIT_AFTER 4
272
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273#ifdef __KERNEL__
274
275#include <linux/linkage.h>
276#include <linux/wait.h>
277#include <linux/types.h>
278#include <linux/kdev_t.h>
279#include <linux/dcache.h>
Josef "Jeff" Sipek0f7fc9e2006-12-08 02:36:35 -0800280#include <linux/namei.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281#include <linux/stat.h>
282#include <linux/cache.h>
283#include <linux/kobject.h>
284#include <linux/list.h>
285#include <linux/radix-tree.h>
286#include <linux/prio_tree.h>
287#include <linux/init.h>
Al Viro914e2632006-10-18 13:55:46 -0400288#include <linux/pid.h>
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800289#include <linux/mutex.h>
Satyam Sharma3bd858a2007-07-17 15:00:08 +0530290#include <linux/capability.h>
Matthew Wilcox6188e102008-04-18 22:21:05 -0400291#include <linux/semaphore.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292
293#include <asm/atomic.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294#include <asm/byteorder.h>
295
Christoph Hellwiga5694252007-07-17 04:04:28 -0700296struct export_operations;
Christoph Hellwiga885c8c2006-01-08 01:02:50 -0800297struct hd_geometry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298struct iovec;
299struct nameidata;
Christoph Hellwig92198f72005-06-23 22:00:59 -0700300struct kiocb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301struct pipe_inode_info;
302struct poll_table_struct;
303struct kstatfs;
304struct vm_area_struct;
305struct vfsmount;
306
Denis Cheng74bf17c2007-10-16 23:26:30 -0700307extern void __init inode_init(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308extern void __init inode_init_early(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309extern void __init files_init(unsigned long);
310
311struct buffer_head;
312typedef int (get_block_t)(struct inode *inode, sector_t iblock,
313 struct buffer_head *bh_result, int create);
Christoph Hellwig92198f72005-06-23 22:00:59 -0700314typedef void (dio_iodone_t)(struct kiocb *iocb, loff_t offset,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315 ssize_t bytes, void *private);
316
317/*
318 * Attribute flags. These should be or-ed together to figure out what
319 * has been changed!
320 */
321#define ATTR_MODE 1
322#define ATTR_UID 2
323#define ATTR_GID 4
324#define ATTR_SIZE 8
325#define ATTR_ATIME 16
326#define ATTR_MTIME 32
327#define ATTR_CTIME 64
328#define ATTR_ATIME_SET 128
329#define ATTR_MTIME_SET 256
330#define ATTR_FORCE 512 /* Not a change, but a change it */
331#define ATTR_ATTR_FLAG 1024
332#define ATTR_KILL_SUID 2048
333#define ATTR_KILL_SGID 4096
Miklos Szeredicc4e69d2005-11-07 00:59:49 -0800334#define ATTR_FILE 8192
Serge E. Hallynb5376772007-10-16 23:31:36 -0700335#define ATTR_KILL_PRIV 16384
Miklos Szeredid139d7f2007-10-18 03:07:00 -0700336#define ATTR_OPEN 32768 /* Truncating from open(O_TRUNC) */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337
338/*
339 * This is the Inode Attributes structure, used for notify_change(). It
340 * uses the above definitions as flags, to know which values have changed.
341 * Also, in this manner, a Filesystem can look at only the values it cares
342 * about. Basically, these are the attributes that the VFS layer can
343 * request to change from the FS layer.
344 *
345 * Derek Atkins <warlord@MIT.EDU> 94-10-20
346 */
347struct iattr {
348 unsigned int ia_valid;
349 umode_t ia_mode;
350 uid_t ia_uid;
351 gid_t ia_gid;
352 loff_t ia_size;
353 struct timespec ia_atime;
354 struct timespec ia_mtime;
355 struct timespec ia_ctime;
Miklos Szeredicc4e69d2005-11-07 00:59:49 -0800356
357 /*
358 * Not an attribute, but an auxilary info for filesystems wanting to
359 * implement an ftruncate() like method. NOTE: filesystem should
360 * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL).
361 */
362 struct file *ia_file;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363};
364
365/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366 * Includes for diskquotas.
367 */
368#include <linux/quota.h>
369
Zach Brown994fc28c2005-12-15 14:28:17 -0800370/**
371 * enum positive_aop_returns - aop return codes with specific semantics
372 *
373 * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has
374 * completed, that the page is still locked, and
375 * should be considered active. The VM uses this hint
376 * to return the page to the active list -- it won't
377 * be a candidate for writeback again in the near
378 * future. Other callers must be careful to unlock
379 * the page if they get this return. Returned by
380 * writepage();
381 *
382 * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has
383 * unlocked it and the page might have been truncated.
384 * The caller should back up to acquiring a new page and
385 * trying again. The aop will be taking reasonable
386 * precautions not to livelock. If the caller held a page
387 * reference, it should drop it before retrying. Returned
Nick Piggin55144762007-10-16 01:25:26 -0700388 * by readpage().
Zach Brown994fc28c2005-12-15 14:28:17 -0800389 *
390 * address_space_operation functions return these large constants to indicate
391 * special semantics to the caller. These are much larger than the bytes in a
392 * page to allow for functions that return the number of bytes operated on in a
393 * given page.
394 */
395
396enum positive_aop_returns {
397 AOP_WRITEPAGE_ACTIVATE = 0x80000,
398 AOP_TRUNCATED_PAGE = 0x80001,
399};
400
Nick Pigginafddba42007-10-16 01:25:01 -0700401#define AOP_FLAG_UNINTERRUPTIBLE 0x0001 /* will not do a short write */
Nick Piggin89e10782007-10-16 01:25:07 -0700402#define AOP_FLAG_CONT_EXPAND 0x0002 /* called from cont_expand */
Nick Pigginafddba42007-10-16 01:25:01 -0700403
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404/*
405 * oh the beauties of C type declarations.
406 */
407struct page;
408struct address_space;
409struct writeback_control;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410
Nick Piggin2f718ff2007-10-16 01:24:59 -0700411struct iov_iter {
412 const struct iovec *iov;
413 unsigned long nr_segs;
414 size_t iov_offset;
415 size_t count;
416};
417
418size_t iov_iter_copy_from_user_atomic(struct page *page,
419 struct iov_iter *i, unsigned long offset, size_t bytes);
420size_t iov_iter_copy_from_user(struct page *page,
421 struct iov_iter *i, unsigned long offset, size_t bytes);
422void iov_iter_advance(struct iov_iter *i, size_t bytes);
Nick Pigginafddba42007-10-16 01:25:01 -0700423int iov_iter_fault_in_readable(struct iov_iter *i, size_t bytes);
Nick Piggin2f718ff2007-10-16 01:24:59 -0700424size_t iov_iter_single_seg_count(struct iov_iter *i);
425
426static inline void iov_iter_init(struct iov_iter *i,
427 const struct iovec *iov, unsigned long nr_segs,
428 size_t count, size_t written)
429{
430 i->iov = iov;
431 i->nr_segs = nr_segs;
432 i->iov_offset = 0;
433 i->count = count + written;
434
435 iov_iter_advance(i, written);
436}
437
438static inline size_t iov_iter_count(struct iov_iter *i)
439{
440 return i->count;
441}
442
443
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444struct address_space_operations {
445 int (*writepage)(struct page *page, struct writeback_control *wbc);
446 int (*readpage)(struct file *, struct page *);
NeilBrown3978d712006-03-26 01:37:17 -0800447 void (*sync_page)(struct page *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448
449 /* Write back some dirty pages from this mapping. */
450 int (*writepages)(struct address_space *, struct writeback_control *);
451
Andrew Morton4741c9f2006-03-24 03:18:11 -0800452 /* Set a page dirty. Return true if this dirtied it */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 int (*set_page_dirty)(struct page *page);
454
455 int (*readpages)(struct file *filp, struct address_space *mapping,
456 struct list_head *pages, unsigned nr_pages);
457
458 /*
459 * ext3 requires that a successful prepare_write() call be followed
460 * by a commit_write() call - they must be balanced
461 */
462 int (*prepare_write)(struct file *, struct page *, unsigned, unsigned);
463 int (*commit_write)(struct file *, struct page *, unsigned, unsigned);
Nick Pigginafddba42007-10-16 01:25:01 -0700464
465 int (*write_begin)(struct file *, struct address_space *mapping,
466 loff_t pos, unsigned len, unsigned flags,
467 struct page **pagep, void **fsdata);
468 int (*write_end)(struct file *, struct address_space *mapping,
469 loff_t pos, unsigned len, unsigned copied,
470 struct page *page, void *fsdata);
471
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472 /* Unfortunately this kludge is needed for FIBMAP. Don't use it */
473 sector_t (*bmap)(struct address_space *, sector_t);
NeilBrown2ff28e22006-03-26 01:37:18 -0800474 void (*invalidatepage) (struct page *, unsigned long);
Al Viro27496a82005-10-21 03:20:48 -0400475 int (*releasepage) (struct page *, gfp_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 ssize_t (*direct_IO)(int, struct kiocb *, const struct iovec *iov,
477 loff_t offset, unsigned long nr_segs);
Nick Piggin70688e42008-04-28 02:13:02 -0700478 int (*get_xip_mem)(struct address_space *, pgoff_t, int,
479 void **, unsigned long *);
Christoph Lametere965f962006-02-01 03:05:41 -0800480 /* migrate the contents of a page to the specified target */
Christoph Lameter2d1db3b2006-06-23 02:03:33 -0700481 int (*migratepage) (struct address_space *,
482 struct page *, struct page *);
Trond Myklebuste3db7692007-01-10 23:15:39 -0800483 int (*launder_page) (struct page *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484};
485
Nick Pigginafddba42007-10-16 01:25:01 -0700486/*
487 * pagecache_write_begin/pagecache_write_end must be used by general code
488 * to write into the pagecache.
489 */
490int pagecache_write_begin(struct file *, struct address_space *mapping,
491 loff_t pos, unsigned len, unsigned flags,
492 struct page **pagep, void **fsdata);
493
494int pagecache_write_end(struct file *, struct address_space *mapping,
495 loff_t pos, unsigned len, unsigned copied,
496 struct page *page, void *fsdata);
497
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498struct backing_dev_info;
499struct address_space {
500 struct inode *host; /* owner: inode, block_device */
501 struct radix_tree_root page_tree; /* radix tree of all pages */
502 rwlock_t tree_lock; /* and rwlock protecting it */
503 unsigned int i_mmap_writable;/* count VM_SHARED mappings */
504 struct prio_tree_root i_mmap; /* tree of private and shared mappings */
505 struct list_head i_mmap_nonlinear;/*list VM_NONLINEAR mappings */
506 spinlock_t i_mmap_lock; /* protect tree, count, list */
507 unsigned int truncate_count; /* Cover race condition with truncate */
508 unsigned long nrpages; /* number of total pages */
509 pgoff_t writeback_index;/* writeback starts here */
Christoph Hellwigf5e54d62006-06-28 04:26:44 -0700510 const struct address_space_operations *a_ops; /* methods */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511 unsigned long flags; /* error bits/gfp mask */
512 struct backing_dev_info *backing_dev_info; /* device readahead, etc */
513 spinlock_t private_lock; /* for use by the address_space */
514 struct list_head private_list; /* ditto */
515 struct address_space *assoc_mapping; /* ditto */
516} __attribute__((aligned(sizeof(long))));
517 /*
518 * On most architectures that alignment is already the case; but
519 * must be enforced here for CRIS, to let the least signficant bit
520 * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON.
521 */
522
523struct block_device {
524 dev_t bd_dev; /* not a kdev_t - it's a search key */
525 struct inode * bd_inode; /* will die */
526 int bd_openers;
Arjan van de Venc039e312006-03-23 03:00:28 -0800527 struct mutex bd_mutex; /* open/close mutex */
David Chinnerf73ca1b2007-01-10 23:15:41 -0800528 struct semaphore bd_mount_sem;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529 struct list_head bd_inodes;
530 void * bd_holder;
531 int bd_holders;
Jun'ichi Nomura641dc632006-03-27 01:17:57 -0800532#ifdef CONFIG_SYSFS
533 struct list_head bd_holder_list;
534#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535 struct block_device * bd_contains;
536 unsigned bd_block_size;
537 struct hd_struct * bd_part;
538 /* number of times partitions within this device have been opened. */
539 unsigned bd_part_count;
540 int bd_invalidated;
541 struct gendisk * bd_disk;
542 struct list_head bd_list;
543 struct backing_dev_info *bd_inode_backing_dev_info;
544 /*
545 * Private data. You must have bd_claim'ed the block_device
546 * to use this. NOTE: bd_claim allows an owner to claim
547 * the same device multiple times, the owner must take special
548 * care to not mess up bd_private for that case.
549 */
550 unsigned long bd_private;
551};
552
553/*
554 * Radix-tree tags, for tagging dirty and writeback pages within the pagecache
555 * radix trees
556 */
557#define PAGECACHE_TAG_DIRTY 0
558#define PAGECACHE_TAG_WRITEBACK 1
559
560int mapping_tagged(struct address_space *mapping, int tag);
561
562/*
563 * Might pages of this file be mapped into userspace?
564 */
565static inline int mapping_mapped(struct address_space *mapping)
566{
567 return !prio_tree_empty(&mapping->i_mmap) ||
568 !list_empty(&mapping->i_mmap_nonlinear);
569}
570
571/*
572 * Might pages of this file have been modified in userspace?
573 * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff
574 * marks vma as VM_SHARED if it is shared, and the file was opened for
575 * writing i.e. vma may be mprotected writable even if now readonly.
576 */
577static inline int mapping_writably_mapped(struct address_space *mapping)
578{
579 return mapping->i_mmap_writable != 0;
580}
581
582/*
583 * Use sequence counter to get consistent i_size on 32-bit processors.
584 */
585#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
586#include <linux/seqlock.h>
587#define __NEED_I_SIZE_ORDERED
588#define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount)
589#else
590#define i_size_ordered_init(inode) do { } while (0)
591#endif
592
593struct inode {
594 struct hlist_node i_hash;
595 struct list_head i_list;
596 struct list_head i_sb_list;
597 struct list_head i_dentry;
598 unsigned long i_ino;
599 atomic_t i_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600 unsigned int i_nlink;
601 uid_t i_uid;
602 gid_t i_gid;
603 dev_t i_rdev;
Jean Noel Cordenner7a224222008-01-28 23:58:27 -0500604 u64 i_version;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605 loff_t i_size;
Eric Dumazet83b7b442006-12-06 20:38:53 -0800606#ifdef __NEED_I_SIZE_ORDERED
607 seqcount_t i_size_seqcount;
608#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609 struct timespec i_atime;
610 struct timespec i_mtime;
611 struct timespec i_ctime;
612 unsigned int i_blkbits;
Takashi Satoa0f62ac2006-03-26 01:37:52 -0800613 blkcnt_t i_blocks;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614 unsigned short i_bytes;
Arnaldo Carvalho de Melo12d40e42006-12-06 20:39:53 -0800615 umode_t i_mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616 spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800617 struct mutex i_mutex;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618 struct rw_semaphore i_alloc_sem;
Arjan van de Venc5ef1c42007-02-12 00:55:40 -0800619 const struct inode_operations *i_op;
Arjan van de Ven99ac48f2006-03-28 01:56:41 -0800620 const struct file_operations *i_fop; /* former ->i_op->default_file_ops */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621 struct super_block *i_sb;
622 struct file_lock *i_flock;
623 struct address_space *i_mapping;
624 struct address_space i_data;
625#ifdef CONFIG_QUOTA
626 struct dquot *i_dquot[MAXQUOTAS];
627#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628 struct list_head i_devices;
Theodore Ts'o4c154162006-09-27 01:50:47 -0700629 union {
630 struct pipe_inode_info *i_pipe;
Theodore Ts'oeaf796e2006-09-27 01:50:48 -0700631 struct block_device *i_bdev;
Theodore Ts'o577c4eb2006-09-27 01:50:49 -0700632 struct cdev *i_cdev;
Theodore Ts'o4c154162006-09-27 01:50:47 -0700633 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634 int i_cindex;
635
636 __u32 i_generation;
637
638#ifdef CONFIG_DNOTIFY
639 unsigned long i_dnotify_mask; /* Directory notify events */
640 struct dnotify_struct *i_dnotify; /* for directory notifications */
641#endif
642
Robert Love0eeca282005-07-12 17:06:03 -0400643#ifdef CONFIG_INOTIFY
644 struct list_head inotify_watches; /* watches on this inode */
Ingo Molnard4f9af92006-03-23 03:00:30 -0800645 struct mutex inotify_mutex; /* protects the watches list */
Robert Love0eeca282005-07-12 17:06:03 -0400646#endif
647
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648 unsigned long i_state;
649 unsigned long dirtied_when; /* jiffies of first dirtying */
650
651 unsigned int i_flags;
652
653 atomic_t i_writecount;
Alexey Dobriyan50462062006-09-29 02:00:01 -0700654#ifdef CONFIG_SECURITY
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655 void *i_security;
Alexey Dobriyan50462062006-09-29 02:00:01 -0700656#endif
Theodore Ts'o8e18e292006-09-27 01:50:46 -0700657 void *i_private; /* fs or device private pointer */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658};
659
660/*
Ingo Molnarf2eace22006-07-03 00:25:05 -0700661 * inode->i_mutex nesting subclasses for the lock validator:
662 *
663 * 0: the object of the current VFS operation
664 * 1: parent
665 * 2: child/target
666 * 3: quota file
667 *
668 * The locking order between these classes is
Ingo Molnar4df46242006-08-27 01:23:56 -0700669 * parent -> child -> normal -> xattr -> quota
Ingo Molnarf2eace22006-07-03 00:25:05 -0700670 */
671enum inode_i_mutex_lock_class
672{
673 I_MUTEX_NORMAL,
674 I_MUTEX_PARENT,
675 I_MUTEX_CHILD,
Ingo Molnar4df46242006-08-27 01:23:56 -0700676 I_MUTEX_XATTR,
Ingo Molnarf2eace22006-07-03 00:25:05 -0700677 I_MUTEX_QUOTA
678};
679
Mark Fasheh62752ee2006-10-17 10:31:38 +0200680extern void inode_double_lock(struct inode *inode1, struct inode *inode2);
681extern void inode_double_unlock(struct inode *inode1, struct inode *inode2);
682
Ingo Molnarf2eace22006-07-03 00:25:05 -0700683/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684 * NOTE: in a 32bit arch with a preemptable kernel and
685 * an UP compile the i_size_read/write must be atomic
686 * with respect to the local cpu (unlike with preempt disabled),
687 * but they don't need to be atomic with respect to other cpus like in
688 * true SMP (so they need either to either locally disable irq around
689 * the read or for example on x86 they can be still implemented as a
690 * cmpxchg8b without the need of the lock prefix). For SMP compiles
691 * and 64bit archs it makes no difference if preempt is enabled or not.
692 */
Jan Engelhardt48ed2142006-12-06 20:35:37 -0800693static inline loff_t i_size_read(const struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694{
695#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
696 loff_t i_size;
697 unsigned int seq;
698
699 do {
700 seq = read_seqcount_begin(&inode->i_size_seqcount);
701 i_size = inode->i_size;
702 } while (read_seqcount_retry(&inode->i_size_seqcount, seq));
703 return i_size;
704#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
705 loff_t i_size;
706
707 preempt_disable();
708 i_size = inode->i_size;
709 preempt_enable();
710 return i_size;
711#else
712 return inode->i_size;
713#endif
714}
715
Miklos Szeredi7762f5a2006-10-17 00:10:07 -0700716/*
717 * NOTE: unlike i_size_read(), i_size_write() does need locking around it
718 * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount
719 * can be lost, resulting in subsequent i_size_read() calls spinning forever.
720 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721static inline void i_size_write(struct inode *inode, loff_t i_size)
722{
723#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
724 write_seqcount_begin(&inode->i_size_seqcount);
725 inode->i_size = i_size;
726 write_seqcount_end(&inode->i_size_seqcount);
727#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
728 preempt_disable();
729 inode->i_size = i_size;
730 preempt_enable();
731#else
732 inode->i_size = i_size;
733#endif
734}
735
Jan Engelhardt48ed2142006-12-06 20:35:37 -0800736static inline unsigned iminor(const struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737{
738 return MINOR(inode->i_rdev);
739}
740
Jan Engelhardt48ed2142006-12-06 20:35:37 -0800741static inline unsigned imajor(const struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742{
743 return MAJOR(inode->i_rdev);
744}
745
746extern struct block_device *I_BDEV(struct inode *inode);
747
748struct fown_struct {
749 rwlock_t lock; /* protects pid, uid, euid fields */
Eric W. Biederman609d7fa2006-10-02 02:17:15 -0700750 struct pid *pid; /* pid or -pgrp where SIGIO should be sent */
751 enum pid_type pid_type; /* Kind of process group SIGIO should be sent to */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752 uid_t uid, euid; /* uid/euid of process setting the owner */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753 int signum; /* posix.1b rt signal to be delivered on IO */
754};
755
756/*
757 * Track a single file's readahead state
758 */
759struct file_ra_state {
Fengguang Wu937085a2007-10-16 01:24:31 -0700760 pgoff_t start; /* where readahead started */
761 unsigned int size; /* # of readahead pages */
762 unsigned int async_size; /* do asynchronous readahead when
Fengguang Wuf9acc8c2007-07-19 01:48:08 -0700763 there are only # of pages ahead */
Fengguang Wu5ce11102007-07-19 01:47:59 -0700764
Fengguang Wu937085a2007-10-16 01:24:31 -0700765 unsigned int ra_pages; /* Maximum readahead window */
Fengguang Wu0bb7ba62007-10-16 01:24:32 -0700766 int mmap_miss; /* Cache miss stat for mmap accesses */
Fengguang Wuf4e6b492007-10-16 01:24:33 -0700767 loff_t prev_pos; /* Cache last read() position */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769
Fengguang Wu5ce11102007-07-19 01:47:59 -0700770/*
Fengguang Wu5ce11102007-07-19 01:47:59 -0700771 * Check if @index falls in the readahead windows.
772 */
773static inline int ra_has_index(struct file_ra_state *ra, pgoff_t index)
774{
Fengguang Wuf9acc8c2007-07-19 01:48:08 -0700775 return (index >= ra->start &&
776 index < ra->start + ra->size);
Fengguang Wu5ce11102007-07-19 01:47:59 -0700777}
778
Dave Hansenad775f52008-02-15 14:38:01 -0800779#define FILE_MNT_WRITE_TAKEN 1
780#define FILE_MNT_WRITE_RELEASED 2
781
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782struct file {
Eric Dumazet2f512012005-10-30 15:02:16 -0800783 /*
784 * fu_list becomes invalid after file_free is called and queued via
785 * fu_rcuhead for RCU freeing
786 */
787 union {
788 struct list_head fu_list;
789 struct rcu_head fu_rcuhead;
790 } f_u;
Josef "Jeff" Sipek0f7fc9e2006-12-08 02:36:35 -0800791 struct path f_path;
792#define f_dentry f_path.dentry
793#define f_vfsmnt f_path.mnt
Arjan van de Ven99ac48f2006-03-28 01:56:41 -0800794 const struct file_operations *f_op;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795 atomic_t f_count;
796 unsigned int f_flags;
797 mode_t f_mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798 loff_t f_pos;
799 struct fown_struct f_owner;
800 unsigned int f_uid, f_gid;
801 struct file_ra_state f_ra;
802
Mathieu Desnoyers2b47c362007-10-16 23:27:21 -0700803 u64 f_version;
Alexey Dobriyan50462062006-09-29 02:00:01 -0700804#ifdef CONFIG_SECURITY
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805 void *f_security;
Alexey Dobriyan50462062006-09-29 02:00:01 -0700806#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807 /* needed for tty driver, and maybe others */
808 void *private_data;
809
810#ifdef CONFIG_EPOLL
811 /* Used by fs/eventpoll.c to link all the hooks to this file */
812 struct list_head f_ep_links;
813 spinlock_t f_ep_lock;
814#endif /* #ifdef CONFIG_EPOLL */
815 struct address_space *f_mapping;
Dave Hansenad775f52008-02-15 14:38:01 -0800816#ifdef CONFIG_DEBUG_WRITECOUNT
817 unsigned long f_mnt_write_state;
818#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819};
820extern spinlock_t files_lock;
821#define file_list_lock() spin_lock(&files_lock);
822#define file_list_unlock() spin_unlock(&files_lock);
823
Nick Piggin095975d2006-01-08 01:02:19 -0800824#define get_file(x) atomic_inc(&(x)->f_count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825#define file_count(x) atomic_read(&(x)->f_count)
826
Dave Hansenad775f52008-02-15 14:38:01 -0800827#ifdef CONFIG_DEBUG_WRITECOUNT
828static inline void file_take_write(struct file *f)
829{
830 WARN_ON(f->f_mnt_write_state != 0);
831 f->f_mnt_write_state = FILE_MNT_WRITE_TAKEN;
832}
833static inline void file_release_write(struct file *f)
834{
835 f->f_mnt_write_state |= FILE_MNT_WRITE_RELEASED;
836}
837static inline void file_reset_write(struct file *f)
838{
839 f->f_mnt_write_state = 0;
840}
841static inline void file_check_state(struct file *f)
842{
843 /*
844 * At this point, either both or neither of these bits
845 * should be set.
846 */
847 WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN);
848 WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_RELEASED);
849}
850static inline int file_check_writeable(struct file *f)
851{
852 if (f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN)
853 return 0;
854 printk(KERN_WARNING "writeable file with no "
855 "mnt_want_write()\n");
856 WARN_ON(1);
857 return -EINVAL;
858}
859#else /* !CONFIG_DEBUG_WRITECOUNT */
860static inline void file_take_write(struct file *filp) {}
861static inline void file_release_write(struct file *filp) {}
862static inline void file_reset_write(struct file *filp) {}
863static inline void file_check_state(struct file *filp) {}
864static inline int file_check_writeable(struct file *filp)
865{
866 return 0;
867}
868#endif /* CONFIG_DEBUG_WRITECOUNT */
869
Linus Torvalds1da177e2005-04-16 15:20:36 -0700870#define MAX_NON_LFS ((1UL<<31) - 1)
871
872/* Page cache limit. The filesystems should put that into their s_maxbytes
873 limits, otherwise bad things can happen in VM. */
874#if BITS_PER_LONG==32
875#define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
876#elif BITS_PER_LONG==64
877#define MAX_LFS_FILESIZE 0x7fffffffffffffffUL
878#endif
879
880#define FL_POSIX 1
881#define FL_FLOCK 2
882#define FL_ACCESS 8 /* not trying to lock, just looking */
Trond Myklebustf475ae92006-06-29 16:38:32 -0400883#define FL_EXISTS 16 /* when unlocking, test for existence */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884#define FL_LEASE 32 /* lease held on this file */
Miklos Szeredi75e1fcc2006-06-23 02:05:12 -0700885#define FL_CLOSE 64 /* unlock on close */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886#define FL_SLEEP 128 /* A blocking lock */
887
888/*
889 * The POSIX file lock owner is determined by
890 * the "struct files_struct" in the thread group
891 * (or NULL for no owner - BSD locks).
892 *
893 * Lockd stuffs a "host" pointer into this.
894 */
895typedef struct files_struct *fl_owner_t;
896
897struct file_lock_operations {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898 void (*fl_copy_lock)(struct file_lock *, struct file_lock *);
899 void (*fl_release_private)(struct file_lock *);
900};
901
902struct lock_manager_operations {
903 int (*fl_compare_owner)(struct file_lock *, struct file_lock *);
904 void (*fl_notify)(struct file_lock *); /* unblock callback */
Marc Eshel2beb6612006-12-05 23:31:28 -0500905 int (*fl_grant)(struct file_lock *, struct file_lock *, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906 void (*fl_copy_lock)(struct file_lock *, struct file_lock *);
907 void (*fl_release_private)(struct file_lock *);
908 void (*fl_break)(struct file_lock *);
909 int (*fl_mylease)(struct file_lock *, struct file_lock *);
910 int (*fl_change)(struct file_lock **, int);
911};
912
913/* that will die - we need it for nfs_lock_info */
914#include <linux/nfs_fs_i.h>
915
916struct file_lock {
917 struct file_lock *fl_next; /* singly linked list for this inode */
918 struct list_head fl_link; /* doubly linked list of all locks */
919 struct list_head fl_block; /* circular list of blocked processes */
920 fl_owner_t fl_owner;
921 unsigned int fl_pid;
Vitaliy Gusevab1f1612008-01-17 00:07:08 +0000922 struct pid *fl_nspid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923 wait_queue_head_t fl_wait;
924 struct file *fl_file;
925 unsigned char fl_flags;
926 unsigned char fl_type;
927 loff_t fl_start;
928 loff_t fl_end;
929
930 struct fasync_struct * fl_fasync; /* for lease break notifications */
931 unsigned long fl_break_time; /* for nonblocking lease breaks */
932
933 struct file_lock_operations *fl_ops; /* Callbacks for filesystems */
934 struct lock_manager_operations *fl_lmops; /* Callbacks for lockmanagers */
935 union {
936 struct nfs_lock_info nfs_fl;
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000937 struct nfs4_lock_info nfs4_fl;
David Howellse8d6c552007-07-15 23:40:12 -0700938 struct {
939 struct list_head link; /* link in AFS vnode's pending_locks list */
940 int state; /* state of grant or error if -ve */
941 } afs;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700942 } fl_u;
943};
944
945/* The following constant reflects the upper bound of the file/locking space */
946#ifndef OFFSET_MAX
947#define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1)))
948#define OFFSET_MAX INT_LIMIT(loff_t)
949#define OFFT_OFFSET_MAX INT_LIMIT(off_t)
950#endif
951
Linus Torvalds1da177e2005-04-16 15:20:36 -0700952#include <linux/fcntl.h>
953
954extern int fcntl_getlk(struct file *, struct flock __user *);
Peter Staubachc2936212005-07-27 11:45:09 -0700955extern int fcntl_setlk(unsigned int, struct file *, unsigned int,
956 struct flock __user *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700957
958#if BITS_PER_LONG == 32
959extern int fcntl_getlk64(struct file *, struct flock64 __user *);
Peter Staubachc2936212005-07-27 11:45:09 -0700960extern int fcntl_setlk64(unsigned int, struct file *, unsigned int,
961 struct flock64 __user *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700962#endif
963
964extern void send_sigio(struct fown_struct *fown, int fd, int band);
965extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg);
966extern int fcntl_getlease(struct file *filp);
967
Andrew Mortonf79e2ab2006-03-31 02:30:42 -0800968/* fs/sync.c */
Mark Fasheh5b04aa32007-03-01 11:01:55 -0800969extern int do_sync_mapping_range(struct address_space *mapping, loff_t offset,
970 loff_t endbyte, unsigned int flags);
Andrew Mortonf79e2ab2006-03-31 02:30:42 -0800971
Linus Torvalds1da177e2005-04-16 15:20:36 -0700972/* fs/locks.c */
973extern void locks_init_lock(struct file_lock *);
974extern void locks_copy_lock(struct file_lock *, struct file_lock *);
J. Bruce Fields1a747ee2008-04-24 10:08:22 -0400975extern void __locks_copy_lock(struct file_lock *, const struct file_lock *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976extern void locks_remove_posix(struct file *, fl_owner_t);
977extern void locks_remove_flock(struct file *);
J. Bruce Fields6d34ac12007-05-11 16:09:32 -0400978extern void posix_test_lock(struct file *, struct file_lock *);
Marc Eshel150b3932007-01-18 16:15:35 -0500979extern int posix_lock_file(struct file *, struct file_lock *, struct file_lock *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980extern int posix_lock_file_wait(struct file *, struct file_lock *);
J. Bruce Fields64a318e2006-01-03 09:55:46 +0100981extern int posix_unblock_lock(struct file *, struct file_lock *);
J. Bruce Fields3ee17ab2007-02-21 00:58:50 -0500982extern int vfs_test_lock(struct file *, struct file_lock *);
Marc Eshel150b3932007-01-18 16:15:35 -0500983extern int vfs_lock_file(struct file *, unsigned int, struct file_lock *, struct file_lock *);
Marc Eshel9b9d2ab2007-01-18 17:52:58 -0500984extern int vfs_cancel_lock(struct file *filp, struct file_lock *fl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700985extern int flock_lock_file_wait(struct file *filp, struct file_lock *fl);
986extern int __break_lease(struct inode *inode, unsigned int flags);
987extern void lease_get_mtime(struct inode *, struct timespec *time);
Christoph Hellwig0af1a452007-07-31 00:39:22 -0700988extern int generic_setlease(struct file *, long, struct file_lock **);
J. Bruce Fieldsa9933ce2007-06-07 17:09:49 -0400989extern int vfs_setlease(struct file *, long, struct file_lock **);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990extern int lease_modify(struct file_lock **, int);
991extern int lock_may_read(struct inode *, loff_t start, unsigned long count);
992extern int lock_may_write(struct inode *, loff_t start, unsigned long count);
Pavel Emelyanov7f8ada92007-10-01 14:41:15 -0700993extern struct seq_operations locks_seq_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994
995struct fasync_struct {
996 int magic;
997 int fa_fd;
998 struct fasync_struct *fa_next; /* singly linked list */
999 struct file *fa_file;
1000};
1001
1002#define FASYNC_MAGIC 0x4601
1003
1004/* SMP safe fasync helpers: */
1005extern int fasync_helper(int, struct file *, int, struct fasync_struct **);
1006/* can be called from interrupts */
1007extern void kill_fasync(struct fasync_struct **, int, int);
1008/* only for net: no internal synchronization */
1009extern void __kill_fasync(struct fasync_struct *, int, int);
1010
Eric W. Biederman609d7fa2006-10-02 02:17:15 -07001011extern int __f_setown(struct file *filp, struct pid *, enum pid_type, int force);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012extern int f_setown(struct file *filp, unsigned long arg, int force);
1013extern void f_delown(struct file *filp);
Eric W. Biederman609d7fa2006-10-02 02:17:15 -07001014extern pid_t f_getown(struct file *filp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015extern int send_sigurg(struct fown_struct *fown);
1016
1017/*
1018 * Umount options
1019 */
1020
1021#define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */
1022#define MNT_DETACH 0x00000002 /* Just detach from the tree */
1023#define MNT_EXPIRE 0x00000004 /* Mark for expiry */
1024
1025extern struct list_head super_blocks;
1026extern spinlock_t sb_lock;
1027
Linus Torvalds1da177e2005-04-16 15:20:36 -07001028#define S_BIAS (1<<30)
1029struct super_block {
1030 struct list_head s_list; /* Keep this first */
1031 dev_t s_dev; /* search index; _not_ kdev_t */
1032 unsigned long s_blocksize;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033 unsigned char s_blocksize_bits;
1034 unsigned char s_dirt;
1035 unsigned long long s_maxbytes; /* Max file size */
1036 struct file_system_type *s_type;
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -08001037 const struct super_operations *s_op;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038 struct dquot_operations *dq_op;
1039 struct quotactl_ops *s_qcop;
Christoph Hellwig39655162007-10-21 16:42:17 -07001040 const struct export_operations *s_export_op;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001041 unsigned long s_flags;
1042 unsigned long s_magic;
1043 struct dentry *s_root;
1044 struct rw_semaphore s_umount;
Ingo Molnar7892f2f2006-01-09 15:59:25 -08001045 struct mutex s_lock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046 int s_count;
1047 int s_syncing;
1048 int s_need_sync_fs;
1049 atomic_t s_active;
Alexey Dobriyan50462062006-09-29 02:00:01 -07001050#ifdef CONFIG_SECURITY
Linus Torvalds1da177e2005-04-16 15:20:36 -07001051 void *s_security;
Alexey Dobriyan50462062006-09-29 02:00:01 -07001052#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053 struct xattr_handler **s_xattr;
1054
1055 struct list_head s_inodes; /* all inodes */
1056 struct list_head s_dirty; /* dirty inodes */
1057 struct list_head s_io; /* parked for writeback */
Ken Chen0e0f4fc2007-10-16 23:30:38 -07001058 struct list_head s_more_io; /* parked for more writeback */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001059 struct hlist_head s_anon; /* anonymous dentries for (nfs) exporting */
1060 struct list_head s_files;
1061
1062 struct block_device *s_bdev;
David Howellsacaebfd2007-05-10 22:51:50 -07001063 struct mtd_info *s_mtd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001064 struct list_head s_instances;
1065 struct quota_info s_dquot; /* Diskquota specific options */
1066
1067 int s_frozen;
1068 wait_queue_head_t s_wait_unfrozen;
1069
1070 char s_id[32]; /* Informational name */
1071
1072 void *s_fs_info; /* Filesystem private info */
1073
1074 /*
1075 * The next field is for VFS *only*. No filesystems have any business
1076 * even looking at it. You had been warned.
1077 */
Arjan van de Vena11f3a02006-03-23 03:00:33 -08001078 struct mutex s_vfs_rename_mutex; /* Kludge */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001079
Kalin KOZHUHAROV8ba8e952006-04-01 01:41:22 +02001080 /* Granularity of c/m/atime in ns.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001081 Cannot be worse than a second */
1082 u32 s_time_gran;
Miklos Szeredi79c0b2d2007-05-08 00:25:43 -07001083
1084 /*
1085 * Filesystem subtype. If non-empty the filesystem type field
1086 * in /proc/mounts will be "type.subtype"
1087 */
1088 char *s_subtype;
Miklos Szeredib3b304a2008-02-08 04:21:35 -08001089
1090 /*
1091 * Saved mount options for lazy filesystems using
1092 * generic_show_options()
1093 */
1094 char *s_options;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001095};
1096
1097extern struct timespec current_fs_time(struct super_block *sb);
1098
1099/*
1100 * Snapshotting support.
1101 */
1102enum {
1103 SB_UNFROZEN = 0,
1104 SB_FREEZE_WRITE = 1,
1105 SB_FREEZE_TRANS = 2,
1106};
1107
1108#define vfs_check_frozen(sb, level) \
1109 wait_event((sb)->s_wait_unfrozen, ((sb)->s_frozen < (level)))
1110
Al Viro914e2632006-10-18 13:55:46 -04001111#define get_fs_excl() atomic_inc(&current->fs_excl)
1112#define put_fs_excl() atomic_dec(&current->fs_excl)
1113#define has_fs_excl() atomic_read(&current->fs_excl)
Jens Axboe22e2c502005-06-27 10:55:12 +02001114
Satyam Sharma3bd858a2007-07-17 15:00:08 +05301115#define is_owner_or_cap(inode) \
1116 ((current->fsuid == (inode)->i_uid) || capable(CAP_FOWNER))
1117
Al Viro914e2632006-10-18 13:55:46 -04001118/* not quite ready to be deprecated, but... */
1119extern void lock_super(struct super_block *);
1120extern void unlock_super(struct super_block *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001121
1122/*
1123 * VFS helper functions..
1124 */
Christoph Hellwige4543ed2005-11-08 21:35:04 -08001125extern int vfs_permission(struct nameidata *, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001126extern int vfs_create(struct inode *, struct dentry *, int, struct nameidata *);
1127extern int vfs_mkdir(struct inode *, struct dentry *, int);
1128extern int vfs_mknod(struct inode *, struct dentry *, int, dev_t);
1129extern int vfs_symlink(struct inode *, struct dentry *, const char *, int);
1130extern int vfs_link(struct dentry *, struct inode *, struct dentry *);
1131extern int vfs_rmdir(struct inode *, struct dentry *);
1132extern int vfs_unlink(struct inode *, struct dentry *);
1133extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
1134
1135/*
1136 * VFS dentry helper functions.
1137 */
1138extern void dentry_unhash(struct dentry *dentry);
1139
1140/*
Christoph Hellwig8c744fb2005-11-08 21:35:04 -08001141 * VFS file helper functions.
1142 */
1143extern int file_permission(struct file *, int);
1144
1145/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001146 * File types
1147 *
1148 * NOTE! These match bits 12..15 of stat.st_mode
1149 * (ie "(i_mode >> 12) & 15").
1150 */
1151#define DT_UNKNOWN 0
1152#define DT_FIFO 1
1153#define DT_CHR 2
1154#define DT_DIR 4
1155#define DT_BLK 6
1156#define DT_REG 8
1157#define DT_LNK 10
1158#define DT_SOCK 12
1159#define DT_WHT 14
1160
1161#define OSYNC_METADATA (1<<0)
1162#define OSYNC_DATA (1<<1)
1163#define OSYNC_INODE (1<<2)
1164int generic_osync_inode(struct inode *, struct address_space *, int);
1165
1166/*
1167 * This is the "filldir" function type, used by readdir() to let
1168 * the kernel specify what kind of dirent layout it wants to have.
1169 * This allows the kernel to read directories into kernel space or
1170 * to have different dirent layouts depending on the binary type.
1171 */
David Howellsafefdbb2006-10-03 01:13:46 -07001172typedef int (*filldir_t)(void *, const char *, int, loff_t, u64, unsigned);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001173
1174struct block_device_operations {
1175 int (*open) (struct inode *, struct file *);
1176 int (*release) (struct inode *, struct file *);
1177 int (*ioctl) (struct inode *, struct file *, unsigned, unsigned long);
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -07001178 long (*unlocked_ioctl) (struct file *, unsigned, unsigned long);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179 long (*compat_ioctl) (struct file *, unsigned, unsigned long);
Jared Hulbert30afcb42008-04-28 02:13:02 -07001180 int (*direct_access) (struct block_device *, sector_t,
1181 void **, unsigned long *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001182 int (*media_changed) (struct gendisk *);
1183 int (*revalidate_disk) (struct gendisk *);
Christoph Hellwiga885c8c2006-01-08 01:02:50 -08001184 int (*getgeo)(struct block_device *, struct hd_geometry *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001185 struct module *owner;
1186};
1187
1188/*
Jens Axboed96e6e72007-06-11 12:18:52 +02001189 * "descriptor" for what we're up to with a read.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001190 * This allows us to use the same read code yet
1191 * have multiple different users of the data that
1192 * we read from a file.
1193 *
1194 * The simplest case just copies the data to user
1195 * mode.
1196 */
1197typedef struct {
1198 size_t written;
1199 size_t count;
1200 union {
1201 char __user * buf;
1202 void *data;
1203 } arg;
1204 int error;
1205} read_descriptor_t;
1206
1207typedef int (*read_actor_t)(read_descriptor_t *, struct page *, unsigned long, unsigned long);
1208
1209/* These macros are for out of kernel modules to test that
1210 * the kernel supports the unlocked_ioctl and compat_ioctl
1211 * fields in struct file_operations. */
1212#define HAVE_COMPAT_IOCTL 1
1213#define HAVE_UNLOCKED_IOCTL 1
1214
1215/*
1216 * NOTE:
1217 * read, write, poll, fsync, readv, writev, unlocked_ioctl and compat_ioctl
1218 * can be called without the big kernel lock held in all filesystems.
1219 */
1220struct file_operations {
1221 struct module *owner;
1222 loff_t (*llseek) (struct file *, loff_t, int);
1223 ssize_t (*read) (struct file *, char __user *, size_t, loff_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001224 ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *);
Badari Pulavarty027445c2006-09-30 23:28:46 -07001225 ssize_t (*aio_read) (struct kiocb *, const struct iovec *, unsigned long, loff_t);
1226 ssize_t (*aio_write) (struct kiocb *, const struct iovec *, unsigned long, loff_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001227 int (*readdir) (struct file *, void *, filldir_t);
1228 unsigned int (*poll) (struct file *, struct poll_table_struct *);
1229 int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long);
1230 long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);
1231 long (*compat_ioctl) (struct file *, unsigned int, unsigned long);
1232 int (*mmap) (struct file *, struct vm_area_struct *);
1233 int (*open) (struct inode *, struct file *);
Miklos Szeredi75e1fcc2006-06-23 02:05:12 -07001234 int (*flush) (struct file *, fl_owner_t id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001235 int (*release) (struct inode *, struct file *);
1236 int (*fsync) (struct file *, struct dentry *, int datasync);
1237 int (*aio_fsync) (struct kiocb *, int datasync);
1238 int (*fasync) (int, struct file *, int);
1239 int (*lock) (struct file *, int, struct file_lock *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001240 ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int);
1241 unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
1242 int (*check_flags)(int);
1243 int (*dir_notify)(struct file *filp, unsigned long arg);
1244 int (*flock) (struct file *, int, struct file_lock *);
Jens Axboecbb7e572006-04-11 14:57:50 +02001245 ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int);
1246 ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int);
J. Bruce Fieldsf9ffed22006-11-14 15:51:40 -05001247 int (*setlease)(struct file *, long, struct file_lock **);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001248};
1249
1250struct inode_operations {
1251 int (*create) (struct inode *,struct dentry *,int, struct nameidata *);
1252 struct dentry * (*lookup) (struct inode *,struct dentry *, struct nameidata *);
1253 int (*link) (struct dentry *,struct inode *,struct dentry *);
1254 int (*unlink) (struct inode *,struct dentry *);
1255 int (*symlink) (struct inode *,struct dentry *,const char *);
1256 int (*mkdir) (struct inode *,struct dentry *,int);
1257 int (*rmdir) (struct inode *,struct dentry *);
1258 int (*mknod) (struct inode *,struct dentry *,int,dev_t);
1259 int (*rename) (struct inode *, struct dentry *,
1260 struct inode *, struct dentry *);
1261 int (*readlink) (struct dentry *, char __user *,int);
Linus Torvaldscc314ee2005-08-19 18:02:56 -07001262 void * (*follow_link) (struct dentry *, struct nameidata *);
1263 void (*put_link) (struct dentry *, struct nameidata *, void *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001264 void (*truncate) (struct inode *);
1265 int (*permission) (struct inode *, int, struct nameidata *);
1266 int (*setattr) (struct dentry *, struct iattr *);
1267 int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *);
1268 int (*setxattr) (struct dentry *, const char *,const void *,size_t,int);
1269 ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t);
1270 ssize_t (*listxattr) (struct dentry *, char *, size_t);
1271 int (*removexattr) (struct dentry *, const char *);
Badari Pulavartyf6b3ec22006-01-06 00:10:38 -08001272 void (*truncate_range)(struct inode *, loff_t, loff_t);
Amit Arora97ac7352007-07-17 21:42:44 -04001273 long (*fallocate)(struct inode *inode, int mode, loff_t offset,
1274 loff_t len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001275};
1276
1277struct seq_file;
1278
Badari Pulavartyeed4e512006-09-30 23:28:49 -07001279ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector,
1280 unsigned long nr_segs, unsigned long fast_segs,
1281 struct iovec *fast_pointer,
1282 struct iovec **ret_pointer);
1283
Linus Torvalds1da177e2005-04-16 15:20:36 -07001284extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *);
1285extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *);
1286extern ssize_t vfs_readv(struct file *, const struct iovec __user *,
1287 unsigned long, loff_t *);
1288extern ssize_t vfs_writev(struct file *, const struct iovec __user *,
1289 unsigned long, loff_t *);
1290
Linus Torvalds1da177e2005-04-16 15:20:36 -07001291struct super_operations {
1292 struct inode *(*alloc_inode)(struct super_block *sb);
1293 void (*destroy_inode)(struct inode *);
1294
Linus Torvalds1da177e2005-04-16 15:20:36 -07001295 void (*dirty_inode) (struct inode *);
1296 int (*write_inode) (struct inode *, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001297 void (*drop_inode) (struct inode *);
1298 void (*delete_inode) (struct inode *);
1299 void (*put_super) (struct super_block *);
1300 void (*write_super) (struct super_block *);
1301 int (*sync_fs)(struct super_block *sb, int wait);
1302 void (*write_super_lockfs) (struct super_block *);
1303 void (*unlockfs) (struct super_block *);
David Howells726c3342006-06-23 02:02:58 -07001304 int (*statfs) (struct dentry *, struct kstatfs *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001305 int (*remount_fs) (struct super_block *, int *, char *);
1306 void (*clear_inode) (struct inode *);
Al Viro42faad92008-04-24 07:21:56 -04001307 void (*umount_begin) (struct super_block *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001308
1309 int (*show_options)(struct seq_file *, struct vfsmount *);
Chuck Leverb4629fe2006-03-20 13:44:12 -05001310 int (*show_stats)(struct seq_file *, struct vfsmount *);
Alexey Dobriyan0e51a722006-09-29 01:59:56 -07001311#ifdef CONFIG_QUOTA
Linus Torvalds1da177e2005-04-16 15:20:36 -07001312 ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t);
1313 ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t);
Alexey Dobriyan0e51a722006-09-29 01:59:56 -07001314#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001315};
1316
Joern Engel1c0eeaf2007-10-16 23:30:44 -07001317/*
1318 * Inode state bits. Protected by inode_lock.
1319 *
1320 * Three bits determine the dirty state of the inode, I_DIRTY_SYNC,
1321 * I_DIRTY_DATASYNC and I_DIRTY_PAGES.
1322 *
1323 * Four bits define the lifetime of an inode. Initially, inodes are I_NEW,
1324 * until that flag is cleared. I_WILL_FREE, I_FREEING and I_CLEAR are set at
1325 * various stages of removing an inode.
1326 *
1327 * Two bits are used for locking and completion notification, I_LOCK and I_SYNC.
1328 *
Joern Engele7ca2d42008-02-06 01:36:59 -08001329 * I_DIRTY_SYNC Inode is dirty, but doesn't have to be written on
1330 * fdatasync(). i_atime is the usual cause.
Jan Kara000cb482008-02-14 19:31:32 -08001331 * I_DIRTY_DATASYNC Data-related inode changes pending. We keep track of
1332 * these changes separately from I_DIRTY_SYNC so that we
1333 * don't have to write inode on fdatasync() when only
1334 * mtime has changed in it.
Joern Engel1c0eeaf2007-10-16 23:30:44 -07001335 * I_DIRTY_PAGES Inode has dirty pages. Inode itself may be clean.
1336 * I_NEW get_new_inode() sets i_state to I_LOCK|I_NEW. Both
1337 * are cleared by unlock_new_inode(), called from iget().
1338 * I_WILL_FREE Must be set when calling write_inode_now() if i_count
1339 * is zero. I_FREEING must be set when I_WILL_FREE is
1340 * cleared.
1341 * I_FREEING Set when inode is about to be freed but still has dirty
1342 * pages or buffers attached or the inode itself is still
1343 * dirty.
1344 * I_CLEAR Set by clear_inode(). In this state the inode is clean
1345 * and can be destroyed.
1346 *
1347 * Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are
1348 * prohibited for many purposes. iget() must wait for
1349 * the inode to be completely released, then create it
1350 * anew. Other functions will just ignore such inodes,
1351 * if appropriate. I_LOCK is used for waiting.
1352 *
1353 * I_LOCK Serves as both a mutex and completion notification.
1354 * New inodes set I_LOCK. If two processes both create
1355 * the same inode, one of them will release its inode and
1356 * wait for I_LOCK to be released before returning.
1357 * Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can
1358 * also cause waiting on I_LOCK, without I_LOCK actually
1359 * being set. find_inode() uses this to prevent returning
1360 * nearly-dead inodes.
1361 * I_SYNC Similar to I_LOCK, but limited in scope to writeback
Joe Perchesfd3f8982008-02-03 17:45:46 +02001362 * of inode dirty data. Having a separate lock for this
Joern Engel1c0eeaf2007-10-16 23:30:44 -07001363 * purpose reduces latency and prevents some filesystem-
1364 * specific deadlocks.
1365 *
Joern Engel1c0eeaf2007-10-16 23:30:44 -07001366 * Q: What is the difference between I_WILL_FREE and I_FREEING?
1367 * Q: igrab() only checks on (I_FREEING|I_WILL_FREE). Should it also check on
1368 * I_CLEAR? If not, why?
1369 */
1370#define I_DIRTY_SYNC 1
1371#define I_DIRTY_DATASYNC 2
1372#define I_DIRTY_PAGES 4
1373#define I_NEW 8
1374#define I_WILL_FREE 16
1375#define I_FREEING 32
1376#define I_CLEAR 64
1377#define __I_LOCK 7
Linus Torvalds1da177e2005-04-16 15:20:36 -07001378#define I_LOCK (1 << __I_LOCK)
Joern Engel1c0eeaf2007-10-16 23:30:44 -07001379#define __I_SYNC 8
1380#define I_SYNC (1 << __I_SYNC)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001381
1382#define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)
1383
1384extern void __mark_inode_dirty(struct inode *, int);
1385static inline void mark_inode_dirty(struct inode *inode)
1386{
1387 __mark_inode_dirty(inode, I_DIRTY);
1388}
1389
1390static inline void mark_inode_dirty_sync(struct inode *inode)
1391{
1392 __mark_inode_dirty(inode, I_DIRTY_SYNC);
1393}
1394
Dave Hansen71c42152007-06-23 17:16:42 -07001395/**
1396 * inc_nlink - directly increment an inode's link count
1397 * @inode: inode
1398 *
1399 * This is a low-level filesystem helper to replace any
1400 * direct filesystem manipulation of i_nlink. Currently,
1401 * it is only here for parity with dec_nlink().
1402 */
Dave Hansend8c76e62006-09-30 23:29:04 -07001403static inline void inc_nlink(struct inode *inode)
Alexey Dobriyan66d21732006-03-23 03:00:51 -08001404{
1405 inode->i_nlink++;
Dave Hansend8c76e62006-09-30 23:29:04 -07001406}
1407
1408static inline void inode_inc_link_count(struct inode *inode)
1409{
1410 inc_nlink(inode);
Alexey Dobriyan66d21732006-03-23 03:00:51 -08001411 mark_inode_dirty(inode);
1412}
1413
Dave Hansen71c42152007-06-23 17:16:42 -07001414/**
1415 * drop_nlink - directly drop an inode's link count
1416 * @inode: inode
1417 *
1418 * This is a low-level filesystem helper to replace any
1419 * direct filesystem manipulation of i_nlink. In cases
1420 * where we are attempting to track writes to the
1421 * filesystem, a decrement to zero means an imminent
1422 * write when the file is truncated and actually unlinked
1423 * on the filesystem.
1424 */
Dave Hansen9a53c3a2006-09-30 23:29:03 -07001425static inline void drop_nlink(struct inode *inode)
Alexey Dobriyan66d21732006-03-23 03:00:51 -08001426{
1427 inode->i_nlink--;
Dave Hansen9a53c3a2006-09-30 23:29:03 -07001428}
1429
Dave Hansen71c42152007-06-23 17:16:42 -07001430/**
1431 * clear_nlink - directly zero an inode's link count
1432 * @inode: inode
1433 *
1434 * This is a low-level filesystem helper to replace any
1435 * direct filesystem manipulation of i_nlink. See
1436 * drop_nlink() for why we care about i_nlink hitting zero.
1437 */
Dave Hansence71ec32006-09-30 23:29:06 -07001438static inline void clear_nlink(struct inode *inode)
1439{
1440 inode->i_nlink = 0;
1441}
1442
Dave Hansen9a53c3a2006-09-30 23:29:03 -07001443static inline void inode_dec_link_count(struct inode *inode)
1444{
1445 drop_nlink(inode);
Alexey Dobriyan66d21732006-03-23 03:00:51 -08001446 mark_inode_dirty(inode);
1447}
1448
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -05001449/**
1450 * inode_inc_iversion - increments i_version
1451 * @inode: inode that need to be updated
1452 *
1453 * Every time the inode is modified, the i_version field will be incremented.
1454 * The filesystem has to be mounted with i_version flag
1455 */
1456
1457static inline void inode_inc_iversion(struct inode *inode)
1458{
1459 spin_lock(&inode->i_lock);
1460 inode->i_version++;
1461 spin_unlock(&inode->i_lock);
1462}
1463
Christoph Hellwig869243a2006-01-09 20:52:03 -08001464extern void touch_atime(struct vfsmount *mnt, struct dentry *dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001465static inline void file_accessed(struct file *file)
1466{
1467 if (!(file->f_flags & O_NOATIME))
Josef "Jeff" Sipek0f7fc9e2006-12-08 02:36:35 -08001468 touch_atime(file->f_path.mnt, file->f_path.dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001469}
1470
1471int sync_inode(struct inode *inode, struct writeback_control *wbc);
1472
Linus Torvalds1da177e2005-04-16 15:20:36 -07001473struct file_system_type {
1474 const char *name;
1475 int fs_flags;
David Howells454e2392006-06-23 02:02:57 -07001476 int (*get_sb) (struct file_system_type *, int,
1477 const char *, void *, struct vfsmount *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001478 void (*kill_sb) (struct super_block *);
1479 struct module *owner;
1480 struct file_system_type * next;
1481 struct list_head fs_supers;
Peter Zijlstrad475fd42007-10-15 14:51:31 +02001482
Ingo Molnarcf516242006-07-03 00:25:27 -07001483 struct lock_class_key s_lock_key;
Arjan van de Ven897c6ff2006-07-03 00:25:28 -07001484 struct lock_class_key s_umount_key;
Peter Zijlstrad475fd42007-10-15 14:51:31 +02001485
1486 struct lock_class_key i_lock_key;
1487 struct lock_class_key i_mutex_key;
Peter Zijlstra14358e62007-10-14 01:38:33 +02001488 struct lock_class_key i_mutex_dir_key;
Peter Zijlstrad475fd42007-10-15 14:51:31 +02001489 struct lock_class_key i_alloc_sem_key;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001490};
1491
David Howells454e2392006-06-23 02:02:57 -07001492extern int get_sb_bdev(struct file_system_type *fs_type,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001493 int flags, const char *dev_name, void *data,
David Howells454e2392006-06-23 02:02:57 -07001494 int (*fill_super)(struct super_block *, void *, int),
1495 struct vfsmount *mnt);
1496extern int get_sb_single(struct file_system_type *fs_type,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001497 int flags, void *data,
David Howells454e2392006-06-23 02:02:57 -07001498 int (*fill_super)(struct super_block *, void *, int),
1499 struct vfsmount *mnt);
1500extern int get_sb_nodev(struct file_system_type *fs_type,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001501 int flags, void *data,
David Howells454e2392006-06-23 02:02:57 -07001502 int (*fill_super)(struct super_block *, void *, int),
1503 struct vfsmount *mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001504void generic_shutdown_super(struct super_block *sb);
1505void kill_block_super(struct super_block *sb);
1506void kill_anon_super(struct super_block *sb);
1507void kill_litter_super(struct super_block *sb);
1508void deactivate_super(struct super_block *sb);
1509int set_anon_super(struct super_block *s, void *data);
1510struct super_block *sget(struct file_system_type *type,
1511 int (*test)(struct super_block *,void *),
1512 int (*set)(struct super_block *,void *),
1513 void *data);
David Howells454e2392006-06-23 02:02:57 -07001514extern int get_sb_pseudo(struct file_system_type *, char *,
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -08001515 const struct super_operations *ops, unsigned long,
David Howells454e2392006-06-23 02:02:57 -07001516 struct vfsmount *mnt);
1517extern int simple_set_mnt(struct vfsmount *mnt, struct super_block *sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001518int __put_super_and_need_restart(struct super_block *sb);
1519void unnamed_dev_init(void);
1520
1521/* Alas, no aliases. Too much hassle with bringing module.h everywhere */
1522#define fops_get(fops) \
1523 (((fops) && try_module_get((fops)->owner) ? (fops) : NULL))
1524#define fops_put(fops) \
1525 do { if (fops) module_put((fops)->owner); } while(0)
1526
1527extern int register_filesystem(struct file_system_type *);
1528extern int unregister_filesystem(struct file_system_type *);
Pavel Emelyanov8bf97252007-10-18 23:40:02 -07001529extern struct vfsmount *kern_mount_data(struct file_system_type *, void *data);
1530#define kern_mount(type) kern_mount_data(type, NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001531extern int may_umount_tree(struct vfsmount *);
1532extern int may_umount(struct vfsmount *);
1533extern long do_mount(char *, char *, char *, unsigned long, void *);
Al Viro8aec0802007-06-07 12:20:32 -04001534extern struct vfsmount *collect_mounts(struct vfsmount *, struct dentry *);
1535extern void drop_collected_mounts(struct vfsmount *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001536
David Howells726c3342006-06-23 02:02:58 -07001537extern int vfs_statfs(struct dentry *, struct kstatfs *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001538
Miklos Szeredif87fd4c2006-01-16 22:14:23 -08001539/* /sys/fs */
Greg Kroah-Hartman00d26662007-10-29 14:17:23 -06001540extern struct kobject *fs_kobj;
Miklos Szeredif87fd4c2006-01-16 22:14:23 -08001541
Linus Torvalds1da177e2005-04-16 15:20:36 -07001542#define FLOCK_VERIFY_READ 1
1543#define FLOCK_VERIFY_WRITE 2
1544
1545extern int locks_mandatory_locked(struct inode *);
1546extern int locks_mandatory_area(int, struct inode *, struct file *, loff_t, size_t);
1547
1548/*
1549 * Candidates for mandatory locking have the setgid bit set
1550 * but no group execute bit - an otherwise meaningless combination.
1551 */
Pavel Emelyanova16877c2007-10-01 14:41:11 -07001552
1553static inline int __mandatory_lock(struct inode *ino)
1554{
1555 return (ino->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID;
1556}
1557
1558/*
1559 * ... and these candidates should be on MS_MANDLOCK mounted fs,
1560 * otherwise these will be advisory locks
1561 */
1562
1563static inline int mandatory_lock(struct inode *ino)
1564{
1565 return IS_MANDLOCK(ino) && __mandatory_lock(ino);
1566}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001567
1568static inline int locks_verify_locked(struct inode *inode)
1569{
Pavel Emelyanova16877c2007-10-01 14:41:11 -07001570 if (mandatory_lock(inode))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001571 return locks_mandatory_locked(inode);
1572 return 0;
1573}
1574
1575extern int rw_verify_area(int, struct file *, loff_t *, size_t);
1576
1577static inline int locks_verify_truncate(struct inode *inode,
1578 struct file *filp,
1579 loff_t size)
1580{
Pavel Emelyanova16877c2007-10-01 14:41:11 -07001581 if (inode->i_flock && mandatory_lock(inode))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001582 return locks_mandatory_area(
1583 FLOCK_VERIFY_WRITE, inode, filp,
1584 size < inode->i_size ? size : inode->i_size,
1585 (size < inode->i_size ? inode->i_size - size
1586 : size - inode->i_size)
1587 );
1588 return 0;
1589}
1590
1591static inline int break_lease(struct inode *inode, unsigned int mode)
1592{
1593 if (inode->i_flock)
1594 return __break_lease(inode, mode);
1595 return 0;
1596}
1597
1598/* fs/open.c */
1599
NeilBrown4a301312006-01-08 01:02:39 -08001600extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs,
1601 struct file *filp);
Jason Uhlenkott8e8a1402007-10-20 03:16:18 +02001602extern long do_sys_open(int dfd, const char __user *filename, int flags,
Ulrich Drepper5590ff02006-01-18 17:43:53 -08001603 int mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001604extern struct file *filp_open(const char *, int, int);
1605extern struct file * dentry_open(struct dentry *, struct vfsmount *, int);
1606extern int filp_close(struct file *, fl_owner_t id);
1607extern char * getname(const char __user *);
1608
1609/* fs/dcache.c */
1610extern void __init vfs_caches_init_early(void);
1611extern void __init vfs_caches_init(unsigned long);
1612
Christoph Lameterb86c0892006-12-06 20:32:57 -08001613extern struct kmem_cache *names_cachep;
1614
Christoph Lametere94b1762006-12-06 20:33:17 -08001615#define __getname() kmem_cache_alloc(names_cachep, GFP_KERNEL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001616#define __putname(name) kmem_cache_free(names_cachep, (void *)(name))
1617#ifndef CONFIG_AUDITSYSCALL
1618#define putname(name) __putname(name)
1619#else
1620extern void putname(const char *name);
1621#endif
1622
David Howells93614012006-09-30 20:45:40 +02001623#ifdef CONFIG_BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -07001624extern int register_blkdev(unsigned int, const char *);
Akinobu Mitaf4480242007-07-17 04:03:47 -07001625extern void unregister_blkdev(unsigned int, const char *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001626extern struct block_device *bdget(dev_t);
1627extern void bd_set_size(struct block_device *, loff_t size);
1628extern void bd_forget(struct inode *inode);
1629extern void bdput(struct block_device *);
1630extern struct block_device *open_by_devnum(dev_t, unsigned);
David Howells93614012006-09-30 20:45:40 +02001631#else
1632static inline void bd_forget(struct inode *inode) {}
1633#endif
1634extern const struct file_operations def_blk_fops;
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08001635extern const struct file_operations def_chr_fops;
1636extern const struct file_operations bad_sock_fops;
1637extern const struct file_operations def_fifo_fops;
David Howells93614012006-09-30 20:45:40 +02001638#ifdef CONFIG_BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -07001639extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long);
1640extern int blkdev_ioctl(struct inode *, struct file *, unsigned, unsigned long);
Alasdair G Kergon7006f6e2006-10-03 01:15:21 -07001641extern int blkdev_driver_ioctl(struct inode *inode, struct file *file,
1642 struct gendisk *disk, unsigned cmd,
1643 unsigned long arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001644extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long);
1645extern int blkdev_get(struct block_device *, mode_t, unsigned);
1646extern int blkdev_put(struct block_device *);
1647extern int bd_claim(struct block_device *, void *);
1648extern void bd_release(struct block_device *);
Jun'ichi Nomura641dc632006-03-27 01:17:57 -08001649#ifdef CONFIG_SYSFS
1650extern int bd_claim_by_disk(struct block_device *, void *, struct gendisk *);
1651extern void bd_release_from_disk(struct block_device *, struct gendisk *);
1652#else
1653#define bd_claim_by_disk(bdev, holder, disk) bd_claim(bdev, holder)
1654#define bd_release_from_disk(bdev, disk) bd_release(bdev)
1655#endif
David Howells93614012006-09-30 20:45:40 +02001656#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001657
1658/* fs/char_dev.c */
Joe Korty68eef3b2006-03-31 02:30:32 -08001659#define CHRDEV_MAJOR_HASH_SIZE 255
Linus Torvalds1da177e2005-04-16 15:20:36 -07001660extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *);
1661extern int register_chrdev_region(dev_t, unsigned, const char *);
1662extern int register_chrdev(unsigned int, const char *,
Arjan van de Ven99ac48f2006-03-28 01:56:41 -08001663 const struct file_operations *);
Akinobu Mitae53252d2007-07-19 01:47:51 -07001664extern void unregister_chrdev(unsigned int, const char *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001665extern void unregister_chrdev_region(dev_t, unsigned);
Joe Korty68eef3b2006-03-31 02:30:32 -08001666extern void chrdev_show(struct seq_file *,off_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001667
1668/* fs/block_dev.c */
1669#define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
David Howells93614012006-09-30 20:45:40 +02001670
1671#ifdef CONFIG_BLOCK
1672#define BLKDEV_MAJOR_HASH_SIZE 255
Linus Torvalds1da177e2005-04-16 15:20:36 -07001673extern const char *__bdevname(dev_t, char *buffer);
1674extern const char *bdevname(struct block_device *bdev, char *buffer);
1675extern struct block_device *lookup_bdev(const char *);
1676extern struct block_device *open_bdev_excl(const char *, int, void *);
1677extern void close_bdev_excl(struct block_device *);
Joe Korty68eef3b2006-03-31 02:30:32 -08001678extern void blkdev_show(struct seq_file *,off_t);
David Howells93614012006-09-30 20:45:40 +02001679#else
1680#define BLKDEV_MAJOR_HASH_SIZE 0
1681#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001682
1683extern void init_special_inode(struct inode *, umode_t, dev_t);
1684
1685/* Invalid inode operations -- fs/bad_inode.c */
1686extern void make_bad_inode(struct inode *);
1687extern int is_bad_inode(struct inode *);
1688
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08001689extern const struct file_operations read_fifo_fops;
1690extern const struct file_operations write_fifo_fops;
1691extern const struct file_operations rdwr_fifo_fops;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001692
1693extern int fs_may_remount_ro(struct super_block *);
1694
David Howells93614012006-09-30 20:45:40 +02001695#ifdef CONFIG_BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -07001696/*
1697 * return READ, READA, or WRITE
1698 */
1699#define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK))
1700
1701/*
1702 * return data direction, READ or WRITE
1703 */
1704#define bio_data_dir(bio) ((bio)->bi_rw & 1)
1705
1706extern int check_disk_change(struct block_device *);
Christoph Hellwig2ef41632005-05-05 16:15:59 -07001707extern int __invalidate_device(struct block_device *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001708extern int invalidate_partition(struct gendisk *, int);
David Howells93614012006-09-30 20:45:40 +02001709#endif
1710extern int invalidate_inodes(struct super_block *);
Andrew Mortonfc9a07e2007-07-15 23:38:14 -07001711unsigned long __invalidate_mapping_pages(struct address_space *mapping,
1712 pgoff_t start, pgoff_t end,
1713 bool be_atomic);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001714unsigned long invalidate_mapping_pages(struct address_space *mapping,
1715 pgoff_t start, pgoff_t end);
Anton Altaparmakov54bc4852007-02-10 01:45:38 -08001716
Andrew Mortonfc0ecff2007-02-10 01:45:39 -08001717static inline unsigned long __deprecated
Anton Altaparmakov54bc4852007-02-10 01:45:38 -08001718invalidate_inode_pages(struct address_space *mapping)
1719{
1720 return invalidate_mapping_pages(mapping, 0, ~0UL);
1721}
1722
Linus Torvalds1da177e2005-04-16 15:20:36 -07001723static inline void invalidate_remote_inode(struct inode *inode)
1724{
1725 if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1726 S_ISLNK(inode->i_mode))
Andrew Mortonfc0ecff2007-02-10 01:45:39 -08001727 invalidate_mapping_pages(inode->i_mapping, 0, -1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001728}
1729extern int invalidate_inode_pages2(struct address_space *mapping);
1730extern int invalidate_inode_pages2_range(struct address_space *mapping,
1731 pgoff_t start, pgoff_t end);
1732extern int write_inode_now(struct inode *, int);
1733extern int filemap_fdatawrite(struct address_space *);
1734extern int filemap_flush(struct address_space *);
1735extern int filemap_fdatawait(struct address_space *);
1736extern int filemap_write_and_wait(struct address_space *mapping);
1737extern int filemap_write_and_wait_range(struct address_space *mapping,
1738 loff_t lstart, loff_t lend);
Andrew Mortonebcf28e2006-03-24 03:18:04 -08001739extern int wait_on_page_writeback_range(struct address_space *mapping,
1740 pgoff_t start, pgoff_t end);
1741extern int __filemap_fdatawrite_range(struct address_space *mapping,
1742 loff_t start, loff_t end, int sync_mode);
1743
Andrew Morton18e79b42006-03-24 03:18:14 -08001744extern long do_fsync(struct file *file, int datasync);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001745extern void sync_supers(void);
1746extern void sync_filesystems(int wait);
David Howellscf9a2ae2006-08-29 19:05:54 +01001747extern void __fsync_super(struct super_block *sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001748extern void emergency_sync(void);
1749extern void emergency_remount(void);
1750extern int do_remount_sb(struct super_block *sb, int flags,
1751 void *data, int force);
David Howells93614012006-09-30 20:45:40 +02001752#ifdef CONFIG_BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -07001753extern sector_t bmap(struct inode *, sector_t);
David Howells93614012006-09-30 20:45:40 +02001754#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001755extern int notify_change(struct dentry *, struct iattr *);
1756extern int permission(struct inode *, int, struct nameidata *);
1757extern int generic_permission(struct inode *, int,
1758 int (*check_acl)(struct inode *, int));
1759
1760extern int get_write_access(struct inode *);
1761extern int deny_write_access(struct file *);
1762static inline void put_write_access(struct inode * inode)
1763{
1764 atomic_dec(&inode->i_writecount);
1765}
1766static inline void allow_write_access(struct file *file)
1767{
1768 if (file)
Josef "Jeff" Sipek0f7fc9e2006-12-08 02:36:35 -08001769 atomic_inc(&file->f_path.dentry->d_inode->i_writecount);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001770}
1771extern int do_pipe(int *);
Andi Kleend6cbd282006-09-30 23:29:26 -07001772extern struct file *create_read_pipe(struct file *f);
1773extern struct file *create_write_pipe(void);
1774extern void free_write_pipe(struct file *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001775
Christoph Hellwiga70e65d2008-02-15 14:37:28 -08001776extern struct file *do_filp_open(int dfd, const char *pathname,
1777 int open_flag, int mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001778extern int may_open(struct nameidata *, int, int);
1779
1780extern int kernel_read(struct file *, unsigned long, char *, unsigned long);
1781extern struct file * open_exec(const char *);
1782
1783/* fs/dcache.c -- generic fs support functions */
1784extern int is_subdir(struct dentry *, struct dentry *);
1785extern ino_t find_inode_number(struct dentry *, struct qstr *);
1786
1787#include <linux/err.h>
1788
1789/* needed for stackable file system support */
1790extern loff_t default_llseek(struct file *file, loff_t offset, int origin);
1791
1792extern loff_t vfs_llseek(struct file *file, loff_t offset, int origin);
1793
1794extern void inode_init_once(struct inode *);
1795extern void iput(struct inode *);
1796extern struct inode * igrab(struct inode *);
1797extern ino_t iunique(struct super_block *, ino_t);
1798extern int inode_needs_sync(struct inode *inode);
1799extern void generic_delete_inode(struct inode *inode);
Mark Fashehcb2c0232005-07-07 17:56:03 -07001800extern void generic_drop_inode(struct inode *inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001801
Anton Altaparmakov88bd5122005-07-13 01:10:44 -07001802extern struct inode *ilookup5_nowait(struct super_block *sb,
1803 unsigned long hashval, int (*test)(struct inode *, void *),
1804 void *data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001805extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval,
1806 int (*test)(struct inode *, void *), void *data);
1807extern struct inode *ilookup(struct super_block *sb, unsigned long ino);
1808
1809extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *);
1810extern struct inode * iget_locked(struct super_block *, unsigned long);
1811extern void unlock_new_inode(struct inode *);
1812
Linus Torvalds1da177e2005-04-16 15:20:36 -07001813extern void __iget(struct inode * inode);
David Howellsb46980f2008-02-07 00:15:27 -08001814extern void iget_failed(struct inode *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001815extern void clear_inode(struct inode *);
1816extern void destroy_inode(struct inode *);
1817extern struct inode *new_inode(struct super_block *);
Jens Axboe01de85e2006-10-17 19:50:36 +02001818extern int should_remove_suid(struct dentry *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001819extern int remove_suid(struct dentry *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001820
1821extern void __insert_inode_hash(struct inode *, unsigned long hashval);
1822extern void remove_inode_hash(struct inode *);
1823static inline void insert_inode_hash(struct inode *inode) {
1824 __insert_inode_hash(inode, inode->i_ino);
1825}
1826
1827extern struct file * get_empty_filp(void);
1828extern void file_move(struct file *f, struct list_head *list);
1829extern void file_kill(struct file *f);
David Howells93614012006-09-30 20:45:40 +02001830#ifdef CONFIG_BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -07001831struct bio;
1832extern void submit_bio(int, struct bio *);
1833extern int bdev_read_only(struct block_device *);
David Howells93614012006-09-30 20:45:40 +02001834#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001835extern int set_blocksize(struct block_device *, int);
1836extern int sb_set_blocksize(struct super_block *, int);
1837extern int sb_min_blocksize(struct super_block *, int);
Fengguang Wu08d8e972007-10-16 23:30:39 -07001838extern int sb_has_dirty_inodes(struct super_block *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001839
1840extern int generic_file_mmap(struct file *, struct vm_area_struct *);
1841extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *);
1842extern int file_read_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001843int generic_write_checks(struct file *file, loff_t *pos, size_t *count, int isblk);
Badari Pulavarty027445c2006-09-30 23:28:46 -07001844extern ssize_t generic_file_aio_read(struct kiocb *, const struct iovec *, unsigned long, loff_t);
Badari Pulavarty027445c2006-09-30 23:28:46 -07001845extern ssize_t generic_file_aio_write(struct kiocb *, const struct iovec *, unsigned long, loff_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001846extern ssize_t generic_file_aio_write_nolock(struct kiocb *, const struct iovec *,
Badari Pulavarty027445c2006-09-30 23:28:46 -07001847 unsigned long, loff_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001848extern ssize_t generic_file_direct_write(struct kiocb *, const struct iovec *,
1849 unsigned long *, loff_t, loff_t *, size_t, size_t);
1850extern ssize_t generic_file_buffered_write(struct kiocb *, const struct iovec *,
1851 unsigned long, loff_t, loff_t *, size_t, ssize_t);
1852extern ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos);
1853extern ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos);
Dmitriy Monakhov0ceb3312007-05-08 00:23:02 -07001854extern int generic_segment_checks(const struct iovec *iov,
1855 unsigned long *nr_segs, size_t *count, int access_flags);
Andrew Morton88e6fae2006-04-11 13:59:36 +02001856
1857/* fs/splice.c */
Jens Axboecbb7e572006-04-11 14:57:50 +02001858extern ssize_t generic_file_splice_read(struct file *, loff_t *,
Andrew Morton88e6fae2006-04-11 13:59:36 +02001859 struct pipe_inode_info *, size_t, unsigned int);
1860extern ssize_t generic_file_splice_write(struct pipe_inode_info *,
Jens Axboecbb7e572006-04-11 14:57:50 +02001861 struct file *, loff_t *, size_t, unsigned int);
Mark Fasheh6da61802006-10-17 18:43:07 +02001862extern ssize_t generic_file_splice_write_nolock(struct pipe_inode_info *,
1863 struct file *, loff_t *, size_t, unsigned int);
Andrew Morton88e6fae2006-04-11 13:59:36 +02001864extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe,
Jens Axboecbb7e572006-04-11 14:57:50 +02001865 struct file *out, loff_t *, size_t len, unsigned int flags);
1866extern long do_splice_direct(struct file *in, loff_t *ppos, struct file *out,
Andrew Morton88e6fae2006-04-11 13:59:36 +02001867 size_t len, unsigned int flags);
1868
Linus Torvalds1da177e2005-04-16 15:20:36 -07001869extern void
1870file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001871extern loff_t no_llseek(struct file *file, loff_t offset, int origin);
1872extern loff_t generic_file_llseek(struct file *file, loff_t offset, int origin);
1873extern loff_t remote_llseek(struct file *file, loff_t offset, int origin);
1874extern int generic_file_open(struct inode * inode, struct file * filp);
1875extern int nonseekable_open(struct inode * inode, struct file * filp);
1876
Carsten Otteceffc072005-06-23 22:05:25 -07001877#ifdef CONFIG_FS_XIP
Carsten Otteeb6fe0c2005-06-23 22:05:28 -07001878extern ssize_t xip_file_read(struct file *filp, char __user *buf, size_t len,
1879 loff_t *ppos);
Carsten Otteceffc072005-06-23 22:05:25 -07001880extern int xip_file_mmap(struct file * file, struct vm_area_struct * vma);
Carsten Otteeb6fe0c2005-06-23 22:05:28 -07001881extern ssize_t xip_file_write(struct file *filp, const char __user *buf,
1882 size_t len, loff_t *ppos);
Carsten Otteceffc072005-06-23 22:05:25 -07001883extern int xip_truncate_page(struct address_space *mapping, loff_t from);
Carsten Otte6d791252005-06-23 22:05:26 -07001884#else
1885static inline int xip_truncate_page(struct address_space *mapping, loff_t from)
1886{
1887 return 0;
1888}
Carsten Otteceffc072005-06-23 22:05:25 -07001889#endif
1890
David Howells93614012006-09-30 20:45:40 +02001891#ifdef CONFIG_BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -07001892ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
1893 struct block_device *bdev, const struct iovec *iov, loff_t offset,
Badari Pulavarty1d8fa7a2006-03-26 01:38:02 -08001894 unsigned long nr_segs, get_block_t get_block, dio_iodone_t end_io,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001895 int lock_type);
1896
1897enum {
1898 DIO_LOCKING = 1, /* need locking between buffered and direct access */
1899 DIO_NO_LOCKING, /* bdev; no locking at all between buffered/direct */
1900 DIO_OWN_LOCKING, /* filesystem locks buffered and direct internally */
1901};
1902
1903static inline ssize_t blockdev_direct_IO(int rw, struct kiocb *iocb,
1904 struct inode *inode, struct block_device *bdev, const struct iovec *iov,
Badari Pulavarty1d8fa7a2006-03-26 01:38:02 -08001905 loff_t offset, unsigned long nr_segs, get_block_t get_block,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001906 dio_iodone_t end_io)
1907{
1908 return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
Badari Pulavarty1d8fa7a2006-03-26 01:38:02 -08001909 nr_segs, get_block, end_io, DIO_LOCKING);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001910}
1911
1912static inline ssize_t blockdev_direct_IO_no_locking(int rw, struct kiocb *iocb,
1913 struct inode *inode, struct block_device *bdev, const struct iovec *iov,
Badari Pulavarty1d8fa7a2006-03-26 01:38:02 -08001914 loff_t offset, unsigned long nr_segs, get_block_t get_block,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001915 dio_iodone_t end_io)
1916{
1917 return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
Badari Pulavarty1d8fa7a2006-03-26 01:38:02 -08001918 nr_segs, get_block, end_io, DIO_NO_LOCKING);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001919}
1920
1921static inline ssize_t blockdev_direct_IO_own_locking(int rw, struct kiocb *iocb,
1922 struct inode *inode, struct block_device *bdev, const struct iovec *iov,
Badari Pulavarty1d8fa7a2006-03-26 01:38:02 -08001923 loff_t offset, unsigned long nr_segs, get_block_t get_block,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001924 dio_iodone_t end_io)
1925{
1926 return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
Badari Pulavarty1d8fa7a2006-03-26 01:38:02 -08001927 nr_segs, get_block, end_io, DIO_OWN_LOCKING);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001928}
David Howells93614012006-09-30 20:45:40 +02001929#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001930
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08001931extern const struct file_operations generic_ro_fops;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001932
1933#define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))
1934
1935extern int vfs_readlink(struct dentry *, char __user *, int, const char *);
1936extern int vfs_follow_link(struct nameidata *, const char *);
1937extern int page_readlink(struct dentry *, char __user *, int);
Linus Torvaldscc314ee2005-08-19 18:02:56 -07001938extern void *page_follow_link_light(struct dentry *, struct nameidata *);
1939extern void page_put_link(struct dentry *, struct nameidata *, void *);
Kirill Korotaev0adb25d2006-03-11 03:27:13 -08001940extern int __page_symlink(struct inode *inode, const char *symname, int len,
1941 gfp_t gfp_mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001942extern int page_symlink(struct inode *inode, const char *symname, int len);
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08001943extern const struct inode_operations page_symlink_inode_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001944extern int generic_readlink(struct dentry *, char __user *, int);
1945extern void generic_fillattr(struct inode *, struct kstat *);
1946extern int vfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
1947void inode_add_bytes(struct inode *inode, loff_t bytes);
1948void inode_sub_bytes(struct inode *inode, loff_t bytes);
1949loff_t inode_get_bytes(struct inode *inode);
1950void inode_set_bytes(struct inode *inode, loff_t bytes);
1951
1952extern int vfs_readdir(struct file *, filldir_t, void *);
1953
1954extern int vfs_stat(char __user *, struct kstat *);
1955extern int vfs_lstat(char __user *, struct kstat *);
Ulrich Drepper5590ff02006-01-18 17:43:53 -08001956extern int vfs_stat_fd(int dfd, char __user *, struct kstat *);
1957extern int vfs_lstat_fd(int dfd, char __user *, struct kstat *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001958extern int vfs_fstat(unsigned int, struct kstat *);
1959
Erez Zadokdeb21db2008-02-07 00:13:25 -08001960extern int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
1961 unsigned long arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001962
Miklos Szeredic18479f2007-10-18 23:39:11 -07001963extern void get_filesystem(struct file_system_type *fs);
1964extern void put_filesystem(struct file_system_type *fs);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001965extern struct file_system_type *get_fs_type(const char *name);
1966extern struct super_block *get_super(struct block_device *);
1967extern struct super_block *user_get_super(dev_t);
1968extern void drop_super(struct super_block *sb);
1969
1970extern int dcache_dir_open(struct inode *, struct file *);
1971extern int dcache_dir_close(struct inode *, struct file *);
1972extern loff_t dcache_dir_lseek(struct file *, loff_t, int);
1973extern int dcache_readdir(struct file *, void *, filldir_t);
1974extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *);
David Howells726c3342006-06-23 02:02:58 -07001975extern int simple_statfs(struct dentry *, struct kstatfs *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001976extern int simple_link(struct dentry *, struct inode *, struct dentry *);
1977extern int simple_unlink(struct inode *, struct dentry *);
1978extern int simple_rmdir(struct inode *, struct dentry *);
1979extern int simple_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
1980extern int simple_sync_file(struct file *, struct dentry *, int);
1981extern int simple_empty(struct dentry *);
1982extern int simple_readpage(struct file *file, struct page *page);
1983extern int simple_prepare_write(struct file *file, struct page *page,
1984 unsigned offset, unsigned to);
Nick Pigginafddba42007-10-16 01:25:01 -07001985extern int simple_write_begin(struct file *file, struct address_space *mapping,
1986 loff_t pos, unsigned len, unsigned flags,
1987 struct page **pagep, void **fsdata);
1988extern int simple_write_end(struct file *file, struct address_space *mapping,
1989 loff_t pos, unsigned len, unsigned copied,
1990 struct page *page, void *fsdata);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001991
1992extern struct dentry *simple_lookup(struct inode *, struct dentry *, struct nameidata *);
1993extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *);
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08001994extern const struct file_operations simple_dir_operations;
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08001995extern const struct inode_operations simple_dir_inode_operations;
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08001996struct tree_descr { char *name; const struct file_operations *ops; int mode; };
Linus Torvalds1da177e2005-04-16 15:20:36 -07001997struct dentry *d_alloc_name(struct dentry *, const char *);
1998extern int simple_fill_super(struct super_block *, int, struct tree_descr *);
Trond Myklebust1f5ce9e2006-06-09 09:34:16 -04001999extern int simple_pin_fs(struct file_system_type *, struct vfsmount **mount, int *count);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002000extern void simple_release_fs(struct vfsmount **mount, int *count);
2001
Akinobu Mita93b07112008-06-05 22:46:21 -07002002extern ssize_t simple_read_from_buffer(void __user *to, size_t count,
2003 loff_t *ppos, const void *from, size_t available);
2004extern ssize_t memory_read_from_buffer(void *to, size_t count, loff_t *ppos,
2005 const void *from, size_t available);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002006
Christoph Lametere965f962006-02-01 03:05:41 -08002007#ifdef CONFIG_MIGRATION
Christoph Lameter2d1db3b2006-06-23 02:03:33 -07002008extern int buffer_migrate_page(struct address_space *,
2009 struct page *, struct page *);
Christoph Lametere965f962006-02-01 03:05:41 -08002010#else
2011#define buffer_migrate_page NULL
2012#endif
2013
Linus Torvalds1da177e2005-04-16 15:20:36 -07002014extern int inode_change_ok(struct inode *, struct iattr *);
2015extern int __must_check inode_setattr(struct inode *, struct iattr *);
2016
Christoph Hellwig870f4812006-01-09 20:52:01 -08002017extern void file_update_time(struct file *file);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002018
Miklos Szeredib3b304a2008-02-08 04:21:35 -08002019extern int generic_show_options(struct seq_file *m, struct vfsmount *mnt);
2020extern void save_mount_options(struct super_block *sb, char *options);
2021
Linus Torvalds1da177e2005-04-16 15:20:36 -07002022static inline ino_t parent_ino(struct dentry *dentry)
2023{
2024 ino_t res;
2025
2026 spin_lock(&dentry->d_lock);
2027 res = dentry->d_parent->d_inode->i_ino;
2028 spin_unlock(&dentry->d_lock);
2029 return res;
2030}
2031
Linus Torvalds1da177e2005-04-16 15:20:36 -07002032/* Transaction based IO helpers */
2033
2034/*
2035 * An argresp is stored in an allocated page and holds the
2036 * size of the argument or response, along with its content
2037 */
2038struct simple_transaction_argresp {
2039 ssize_t size;
2040 char data[0];
2041};
2042
2043#define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp))
2044
2045char *simple_transaction_get(struct file *file, const char __user *buf,
2046 size_t size);
2047ssize_t simple_transaction_read(struct file *file, char __user *buf,
2048 size_t size, loff_t *pos);
2049int simple_transaction_release(struct inode *inode, struct file *file);
2050
2051static inline void simple_transaction_set(struct file *file, size_t n)
2052{
2053 struct simple_transaction_argresp *ar = file->private_data;
2054
2055 BUG_ON(n > SIMPLE_TRANSACTION_LIMIT);
2056
2057 /*
2058 * The barrier ensures that ar->size will really remain zero until
2059 * ar->data is ready for reading.
2060 */
2061 smp_mb();
2062 ar->size = n;
2063}
2064
Arnd Bergmannacaefc22005-05-18 14:40:59 +02002065/*
2066 * simple attribute files
2067 *
2068 * These attributes behave similar to those in sysfs:
2069 *
2070 * Writing to an attribute immediately sets a value, an open file can be
2071 * written to multiple times.
2072 *
2073 * Reading from an attribute creates a buffer from the value that might get
2074 * read with multiple read calls. When the attribute has been read
2075 * completely, no further read calls are possible until the file is opened
2076 * again.
2077 *
2078 * All attributes contain a text representation of a numeric value
2079 * that are accessed with the get() and set() functions.
2080 */
2081#define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \
2082static int __fops ## _open(struct inode *inode, struct file *file) \
2083{ \
2084 __simple_attr_check_format(__fmt, 0ull); \
2085 return simple_attr_open(inode, file, __get, __set, __fmt); \
2086} \
2087static struct file_operations __fops = { \
2088 .owner = THIS_MODULE, \
2089 .open = __fops ## _open, \
Christoph Hellwig74bedc42008-02-08 04:20:28 -08002090 .release = simple_attr_release, \
Arnd Bergmannacaefc22005-05-18 14:40:59 +02002091 .read = simple_attr_read, \
2092 .write = simple_attr_write, \
2093};
2094
2095static inline void __attribute__((format(printf, 1, 2)))
2096__simple_attr_check_format(const char *fmt, ...)
2097{
2098 /* don't do anything, just let the compiler check the arguments; */
2099}
2100
2101int simple_attr_open(struct inode *inode, struct file *file,
Christoph Hellwig8b88b092008-02-08 04:20:26 -08002102 int (*get)(void *, u64 *), int (*set)(void *, u64),
Arnd Bergmannacaefc22005-05-18 14:40:59 +02002103 const char *fmt);
Christoph Hellwig74bedc42008-02-08 04:20:28 -08002104int simple_attr_release(struct inode *inode, struct file *file);
Arnd Bergmannacaefc22005-05-18 14:40:59 +02002105ssize_t simple_attr_read(struct file *file, char __user *buf,
2106 size_t len, loff_t *ppos);
2107ssize_t simple_attr_write(struct file *file, const char __user *buf,
2108 size_t len, loff_t *ppos);
2109
2110
Linus Torvalds1da177e2005-04-16 15:20:36 -07002111#ifdef CONFIG_SECURITY
2112static inline char *alloc_secdata(void)
2113{
2114 return (char *)get_zeroed_page(GFP_KERNEL);
2115}
2116
2117static inline void free_secdata(void *secdata)
2118{
2119 free_page((unsigned long)secdata);
2120}
2121#else
2122static inline char *alloc_secdata(void)
2123{
2124 return (char *)1;
2125}
2126
2127static inline void free_secdata(void *secdata)
2128{ }
2129#endif /* CONFIG_SECURITY */
2130
Alexey Dobriyan4be28542007-10-16 23:26:21 -07002131struct ctl_table;
2132int proc_nr_files(struct ctl_table *table, int write, struct file *filp,
Adrian Bunk62239ac2007-07-17 04:03:45 -07002133 void __user *buffer, size_t *lenp, loff_t *ppos);
2134
Adrian Bunk011e3fc2008-02-06 01:36:47 -08002135int get_filesystem_list(char * buf);
Adrian Bunk62239ac2007-07-17 04:03:45 -07002136
Linus Torvalds1da177e2005-04-16 15:20:36 -07002137#endif /* __KERNEL__ */
2138#endif /* _LINUX_FS_H */