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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
24#define NR_OPEN (1024*1024) /* Absolute upper limit on fd num */
25#define INR_OPEN 1024 /* Initial setting for nfile rlimits */
26
27#define BLOCK_SIZE_BITS 10
28#define BLOCK_SIZE (1<<BLOCK_SIZE_BITS)
29
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 */
33
Linus Torvalds1da177e2005-04-16 15:20:36 -070034/* And dynamically-tunable limits and defaults: */
35struct files_stat_struct {
36 int nr_files; /* read only */
37 int nr_free_files; /* read only */
38 int max_files; /* tunable */
39};
40extern struct files_stat_struct files_stat;
Dipankar Sarma529bf6b2006-03-07 21:55:35 -080041extern int get_max_files(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -070042
43struct inodes_stat_t {
44 int nr_inodes;
45 int nr_unused;
46 int dummy[5];
47};
48extern struct inodes_stat_t inodes_stat;
49
50extern int leases_enable, lease_break_time;
51
52#ifdef CONFIG_DNOTIFY
53extern int dir_notify_enable;
54#endif
55
56#define NR_FILE 8192 /* this can well be larger on a larger system */
57
58#define MAY_EXEC 1
59#define MAY_WRITE 2
60#define MAY_READ 4
61#define MAY_APPEND 8
62
63#define FMODE_READ 1
64#define FMODE_WRITE 2
65
66/* Internal kernel extensions */
67#define FMODE_LSEEK 4
68#define FMODE_PREAD 8
69#define FMODE_PWRITE FMODE_PREAD /* These go hand in hand */
70
Oleg Drokinb5005312006-03-25 03:07:01 -080071/* File is being opened for execution. Primary users of this flag are
72 distributed filesystems that can use it to achieve correct ETXTBUSY
73 behavior for cross-node execution/opening_for_writing of files */
74#define FMODE_EXEC 16
75
Linus Torvalds1da177e2005-04-16 15:20:36 -070076#define RW_MASK 1
77#define RWA_MASK 2
78#define READ 0
79#define WRITE 1
80#define READA 2 /* read-ahead - don't block if no resources */
Jan Karaa7662232005-09-06 15:19:10 -070081#define SWRITE 3 /* for ll_rw_block() - wait for buffer lock */
Linus Torvalds1da177e2005-04-16 15:20:36 -070082#define SPECIAL 4 /* For non-blockdevice requests in request queue */
83#define READ_SYNC (READ | (1 << BIO_RW_SYNC))
84#define WRITE_SYNC (WRITE | (1 << BIO_RW_SYNC))
85#define WRITE_BARRIER ((1 << BIO_RW) | (1 << BIO_RW_BARRIER))
86
87#define SEL_IN 1
88#define SEL_OUT 2
89#define SEL_EX 4
90
91/* public flags for file_system_type */
92#define FS_REQUIRES_DEV 1
93#define FS_BINARY_MOUNTDATA 2
94#define FS_REVAL_DOT 16384 /* Check the paths ".", ".." for staleness */
Mark Fasheh349457c2006-09-08 14:22:21 -070095#define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move()
96 * during rename() internally.
97 */
98
Linus Torvalds1da177e2005-04-16 15:20:36 -070099/*
100 * These are the fs-independent mount-flags: up to 32 flags are supported
101 */
102#define MS_RDONLY 1 /* Mount read-only */
103#define MS_NOSUID 2 /* Ignore suid and sgid bits */
104#define MS_NODEV 4 /* Disallow access to device special files */
105#define MS_NOEXEC 8 /* Disallow program execution */
106#define MS_SYNCHRONOUS 16 /* Writes are synced at once */
107#define MS_REMOUNT 32 /* Alter flags of a mounted FS */
108#define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */
109#define MS_DIRSYNC 128 /* Directory modifications are synchronous */
110#define MS_NOATIME 1024 /* Do not update access times. */
111#define MS_NODIRATIME 2048 /* Do not update directory access times */
112#define MS_BIND 4096
113#define MS_MOVE 8192
114#define MS_REC 16384
Theodore Ts'o9b04c992006-03-24 03:15:10 -0800115#define MS_VERBOSE 32768 /* War is peace. Verbosity is silence.
116 MS_VERBOSE is deprecated. */
117#define MS_SILENT 32768
Miklos Szeredibf066c72006-01-08 01:03:19 -0800118#define MS_POSIXACL (1<<16) /* VFS does not apply the umask */
Ram Pai9676f0c2005-11-07 17:21:20 -0500119#define MS_UNBINDABLE (1<<17) /* change to unbindable */
Ram Pai07b20882005-11-07 17:19:07 -0500120#define MS_PRIVATE (1<<18) /* change to private */
Ram Paia58b0eb2005-11-07 17:20:48 -0500121#define MS_SLAVE (1<<19) /* change to slave */
Ram Pai03e06e62005-11-07 17:19:33 -0500122#define MS_SHARED (1<<20) /* change to shared */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123#define MS_ACTIVE (1<<30)
124#define MS_NOUSER (1<<31)
125
126/*
127 * Superblock flags that can be altered by MS_REMOUNT
128 */
Christoph Hellwigfc33a7b2006-01-09 20:52:17 -0800129#define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130
131/*
132 * Old magic mount flag and mask
133 */
134#define MS_MGC_VAL 0xC0ED0000
135#define MS_MGC_MSK 0xffff0000
136
137/* Inode flags - they have nothing to superblock flags now */
138
139#define S_SYNC 1 /* Writes are synced at once */
140#define S_NOATIME 2 /* Do not update access times */
141#define S_APPEND 4 /* Append-only file */
142#define S_IMMUTABLE 8 /* Immutable file */
143#define S_DEAD 16 /* removed, but still open directory */
144#define S_NOQUOTA 32 /* Inode is not counted to quota */
145#define S_DIRSYNC 64 /* Directory modifications are synchronous */
146#define S_NOCMTIME 128 /* Do not update file c/mtime */
147#define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */
148#define S_PRIVATE 512 /* Inode is fs-internal */
149
150/*
151 * Note that nosuid etc flags are inode-specific: setting some file-system
152 * flags just means all the inodes inherit those flags by default. It might be
153 * possible to override it selectively if you really wanted to with some
154 * ioctl() that is not currently implemented.
155 *
156 * Exception: MS_RDONLY is always applied to the entire file system.
157 *
158 * Unfortunately, it is possible to change a filesystems flags with it mounted
159 * with files in use. This means that all of the inodes will not have their
160 * i_flags updated. Hence, i_flags no longer inherit the superblock mount
161 * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
162 */
163#define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg))
164
165#define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY)
166#define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \
167 ((inode)->i_flags & S_SYNC))
168#define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \
169 ((inode)->i_flags & (S_SYNC|S_DIRSYNC)))
170#define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK)
171
172#define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA)
173#define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
174#define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175#define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL)
176
177#define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD)
178#define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME)
179#define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE)
180#define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE)
181
182/* the read-only stuff doesn't really belong here, but any other place is
183 probably as bad and I don't want to create yet another include file. */
184
185#define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */
186#define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */
187#define BLKRRPART _IO(0x12,95) /* re-read partition table */
188#define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */
189#define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */
190#define BLKRASET _IO(0x12,98) /* set read ahead for block device */
191#define BLKRAGET _IO(0x12,99) /* get current read ahead setting */
192#define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */
193#define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */
194#define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */
195#define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */
196#define BLKSSZGET _IO(0x12,104)/* get block device sector size */
197#if 0
198#define BLKPG _IO(0x12,105)/* See blkpg.h */
199
200/* Some people are morons. Do not use sizeof! */
201
202#define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */
203#define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */
204/* This was here just to show that the number is taken -
205 probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */
206#endif
207/* A jump here: 108-111 have been used for various private purposes. */
208#define BLKBSZGET _IOR(0x12,112,size_t)
209#define BLKBSZSET _IOW(0x12,113,size_t)
210#define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
Jens Axboe2056a782006-03-23 20:00:26 +0100211#define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup)
212#define BLKTRACESTART _IO(0x12,116)
213#define BLKTRACESTOP _IO(0x12,117)
214#define BLKTRACETEARDOWN _IO(0x12,118)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215
216#define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
217#define FIBMAP _IO(0x00,1) /* bmap access */
218#define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */
219
Andrew Mortone46e4902006-05-22 22:35:24 -0700220#define SYNC_FILE_RANGE_WAIT_BEFORE 1
221#define SYNC_FILE_RANGE_WRITE 2
222#define SYNC_FILE_RANGE_WAIT_AFTER 4
223
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224#ifdef __KERNEL__
225
226#include <linux/linkage.h>
227#include <linux/wait.h>
228#include <linux/types.h>
229#include <linux/kdev_t.h>
230#include <linux/dcache.h>
231#include <linux/stat.h>
232#include <linux/cache.h>
233#include <linux/kobject.h>
234#include <linux/list.h>
235#include <linux/radix-tree.h>
236#include <linux/prio_tree.h>
237#include <linux/init.h>
Jens Axboe22e2c502005-06-27 10:55:12 +0200238#include <linux/sched.h>
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800239#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240
241#include <asm/atomic.h>
242#include <asm/semaphore.h>
243#include <asm/byteorder.h>
244
Christoph Hellwiga885c8c2006-01-08 01:02:50 -0800245struct hd_geometry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246struct iovec;
247struct nameidata;
Christoph Hellwig92198f72005-06-23 22:00:59 -0700248struct kiocb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249struct pipe_inode_info;
250struct poll_table_struct;
251struct kstatfs;
252struct vm_area_struct;
253struct vfsmount;
254
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255extern void __init inode_init(unsigned long);
256extern void __init inode_init_early(void);
257extern void __init mnt_init(unsigned long);
258extern void __init files_init(unsigned long);
259
260struct buffer_head;
261typedef int (get_block_t)(struct inode *inode, sector_t iblock,
262 struct buffer_head *bh_result, int create);
Christoph Hellwig92198f72005-06-23 22:00:59 -0700263typedef void (dio_iodone_t)(struct kiocb *iocb, loff_t offset,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 ssize_t bytes, void *private);
265
266/*
267 * Attribute flags. These should be or-ed together to figure out what
268 * has been changed!
269 */
270#define ATTR_MODE 1
271#define ATTR_UID 2
272#define ATTR_GID 4
273#define ATTR_SIZE 8
274#define ATTR_ATIME 16
275#define ATTR_MTIME 32
276#define ATTR_CTIME 64
277#define ATTR_ATIME_SET 128
278#define ATTR_MTIME_SET 256
279#define ATTR_FORCE 512 /* Not a change, but a change it */
280#define ATTR_ATTR_FLAG 1024
281#define ATTR_KILL_SUID 2048
282#define ATTR_KILL_SGID 4096
Miklos Szeredicc4e69d2005-11-07 00:59:49 -0800283#define ATTR_FILE 8192
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284
285/*
286 * This is the Inode Attributes structure, used for notify_change(). It
287 * uses the above definitions as flags, to know which values have changed.
288 * Also, in this manner, a Filesystem can look at only the values it cares
289 * about. Basically, these are the attributes that the VFS layer can
290 * request to change from the FS layer.
291 *
292 * Derek Atkins <warlord@MIT.EDU> 94-10-20
293 */
294struct iattr {
295 unsigned int ia_valid;
296 umode_t ia_mode;
297 uid_t ia_uid;
298 gid_t ia_gid;
299 loff_t ia_size;
300 struct timespec ia_atime;
301 struct timespec ia_mtime;
302 struct timespec ia_ctime;
Miklos Szeredicc4e69d2005-11-07 00:59:49 -0800303
304 /*
305 * Not an attribute, but an auxilary info for filesystems wanting to
306 * implement an ftruncate() like method. NOTE: filesystem should
307 * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL).
308 */
309 struct file *ia_file;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310};
311
312/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 * Includes for diskquotas.
314 */
315#include <linux/quota.h>
316
Zach Brown994fc28c2005-12-15 14:28:17 -0800317/**
318 * enum positive_aop_returns - aop return codes with specific semantics
319 *
320 * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has
321 * completed, that the page is still locked, and
322 * should be considered active. The VM uses this hint
323 * to return the page to the active list -- it won't
324 * be a candidate for writeback again in the near
325 * future. Other callers must be careful to unlock
326 * the page if they get this return. Returned by
327 * writepage();
328 *
329 * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has
330 * unlocked it and the page might have been truncated.
331 * The caller should back up to acquiring a new page and
332 * trying again. The aop will be taking reasonable
333 * precautions not to livelock. If the caller held a page
334 * reference, it should drop it before retrying. Returned
335 * by readpage(), prepare_write(), and commit_write().
336 *
337 * address_space_operation functions return these large constants to indicate
338 * special semantics to the caller. These are much larger than the bytes in a
339 * page to allow for functions that return the number of bytes operated on in a
340 * given page.
341 */
342
343enum positive_aop_returns {
344 AOP_WRITEPAGE_ACTIVATE = 0x80000,
345 AOP_TRUNCATED_PAGE = 0x80001,
346};
347
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348/*
349 * oh the beauties of C type declarations.
350 */
351struct page;
352struct address_space;
353struct writeback_control;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354
355struct address_space_operations {
356 int (*writepage)(struct page *page, struct writeback_control *wbc);
357 int (*readpage)(struct file *, struct page *);
NeilBrown3978d712006-03-26 01:37:17 -0800358 void (*sync_page)(struct page *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359
360 /* Write back some dirty pages from this mapping. */
361 int (*writepages)(struct address_space *, struct writeback_control *);
362
Andrew Morton4741c9f2006-03-24 03:18:11 -0800363 /* Set a page dirty. Return true if this dirtied it */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 int (*set_page_dirty)(struct page *page);
365
366 int (*readpages)(struct file *filp, struct address_space *mapping,
367 struct list_head *pages, unsigned nr_pages);
368
369 /*
370 * ext3 requires that a successful prepare_write() call be followed
371 * by a commit_write() call - they must be balanced
372 */
373 int (*prepare_write)(struct file *, struct page *, unsigned, unsigned);
374 int (*commit_write)(struct file *, struct page *, unsigned, unsigned);
375 /* Unfortunately this kludge is needed for FIBMAP. Don't use it */
376 sector_t (*bmap)(struct address_space *, sector_t);
NeilBrown2ff28e22006-03-26 01:37:18 -0800377 void (*invalidatepage) (struct page *, unsigned long);
Al Viro27496a82005-10-21 03:20:48 -0400378 int (*releasepage) (struct page *, gfp_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379 ssize_t (*direct_IO)(int, struct kiocb *, const struct iovec *iov,
380 loff_t offset, unsigned long nr_segs);
Carsten Otteceffc072005-06-23 22:05:25 -0700381 struct page* (*get_xip_page)(struct address_space *, sector_t,
382 int);
Christoph Lametere965f962006-02-01 03:05:41 -0800383 /* migrate the contents of a page to the specified target */
Christoph Lameter2d1db3b2006-06-23 02:03:33 -0700384 int (*migratepage) (struct address_space *,
385 struct page *, struct page *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386};
387
388struct backing_dev_info;
389struct address_space {
390 struct inode *host; /* owner: inode, block_device */
391 struct radix_tree_root page_tree; /* radix tree of all pages */
392 rwlock_t tree_lock; /* and rwlock protecting it */
393 unsigned int i_mmap_writable;/* count VM_SHARED mappings */
394 struct prio_tree_root i_mmap; /* tree of private and shared mappings */
395 struct list_head i_mmap_nonlinear;/*list VM_NONLINEAR mappings */
396 spinlock_t i_mmap_lock; /* protect tree, count, list */
397 unsigned int truncate_count; /* Cover race condition with truncate */
398 unsigned long nrpages; /* number of total pages */
399 pgoff_t writeback_index;/* writeback starts here */
Christoph Hellwigf5e54d62006-06-28 04:26:44 -0700400 const struct address_space_operations *a_ops; /* methods */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 unsigned long flags; /* error bits/gfp mask */
402 struct backing_dev_info *backing_dev_info; /* device readahead, etc */
403 spinlock_t private_lock; /* for use by the address_space */
404 struct list_head private_list; /* ditto */
405 struct address_space *assoc_mapping; /* ditto */
406} __attribute__((aligned(sizeof(long))));
407 /*
408 * On most architectures that alignment is already the case; but
409 * must be enforced here for CRIS, to let the least signficant bit
410 * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON.
411 */
412
413struct block_device {
414 dev_t bd_dev; /* not a kdev_t - it's a search key */
415 struct inode * bd_inode; /* will die */
416 int bd_openers;
Arjan van de Venc039e312006-03-23 03:00:28 -0800417 struct mutex bd_mutex; /* open/close mutex */
418 struct mutex bd_mount_mutex; /* mount mutex */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 struct list_head bd_inodes;
420 void * bd_holder;
421 int bd_holders;
Jun'ichi Nomura641dc632006-03-27 01:17:57 -0800422#ifdef CONFIG_SYSFS
423 struct list_head bd_holder_list;
424#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425 struct block_device * bd_contains;
426 unsigned bd_block_size;
427 struct hd_struct * bd_part;
428 /* number of times partitions within this device have been opened. */
429 unsigned bd_part_count;
430 int bd_invalidated;
431 struct gendisk * bd_disk;
432 struct list_head bd_list;
433 struct backing_dev_info *bd_inode_backing_dev_info;
434 /*
435 * Private data. You must have bd_claim'ed the block_device
436 * to use this. NOTE: bd_claim allows an owner to claim
437 * the same device multiple times, the owner must take special
438 * care to not mess up bd_private for that case.
439 */
440 unsigned long bd_private;
441};
442
443/*
Ingo Molnar663d4402006-07-03 00:25:33 -0700444 * bdev->bd_mutex nesting subclasses for the lock validator:
445 *
446 * 0: normal
447 * 1: 'whole'
448 * 2: 'partition'
449 */
450enum bdev_bd_mutex_lock_class
451{
452 BD_MUTEX_NORMAL,
453 BD_MUTEX_WHOLE,
454 BD_MUTEX_PARTITION
455};
456
457
458/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 * Radix-tree tags, for tagging dirty and writeback pages within the pagecache
460 * radix trees
461 */
462#define PAGECACHE_TAG_DIRTY 0
463#define PAGECACHE_TAG_WRITEBACK 1
464
465int mapping_tagged(struct address_space *mapping, int tag);
466
467/*
468 * Might pages of this file be mapped into userspace?
469 */
470static inline int mapping_mapped(struct address_space *mapping)
471{
472 return !prio_tree_empty(&mapping->i_mmap) ||
473 !list_empty(&mapping->i_mmap_nonlinear);
474}
475
476/*
477 * Might pages of this file have been modified in userspace?
478 * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff
479 * marks vma as VM_SHARED if it is shared, and the file was opened for
480 * writing i.e. vma may be mprotected writable even if now readonly.
481 */
482static inline int mapping_writably_mapped(struct address_space *mapping)
483{
484 return mapping->i_mmap_writable != 0;
485}
486
487/*
488 * Use sequence counter to get consistent i_size on 32-bit processors.
489 */
490#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
491#include <linux/seqlock.h>
492#define __NEED_I_SIZE_ORDERED
493#define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount)
494#else
495#define i_size_ordered_init(inode) do { } while (0)
496#endif
497
498struct inode {
499 struct hlist_node i_hash;
500 struct list_head i_list;
501 struct list_head i_sb_list;
502 struct list_head i_dentry;
503 unsigned long i_ino;
504 atomic_t i_count;
505 umode_t i_mode;
506 unsigned int i_nlink;
507 uid_t i_uid;
508 gid_t i_gid;
509 dev_t i_rdev;
510 loff_t i_size;
511 struct timespec i_atime;
512 struct timespec i_mtime;
513 struct timespec i_ctime;
514 unsigned int i_blkbits;
515 unsigned long i_blksize;
516 unsigned long i_version;
Takashi Satoa0f62ac2006-03-26 01:37:52 -0800517 blkcnt_t i_blocks;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518 unsigned short i_bytes;
519 spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800520 struct mutex i_mutex;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521 struct rw_semaphore i_alloc_sem;
522 struct inode_operations *i_op;
Arjan van de Ven99ac48f2006-03-28 01:56:41 -0800523 const struct file_operations *i_fop; /* former ->i_op->default_file_ops */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524 struct super_block *i_sb;
525 struct file_lock *i_flock;
526 struct address_space *i_mapping;
527 struct address_space i_data;
528#ifdef CONFIG_QUOTA
529 struct dquot *i_dquot[MAXQUOTAS];
530#endif
531 /* These three should probably be a union */
532 struct list_head i_devices;
533 struct pipe_inode_info *i_pipe;
534 struct block_device *i_bdev;
535 struct cdev *i_cdev;
536 int i_cindex;
537
538 __u32 i_generation;
539
540#ifdef CONFIG_DNOTIFY
541 unsigned long i_dnotify_mask; /* Directory notify events */
542 struct dnotify_struct *i_dnotify; /* for directory notifications */
543#endif
544
Robert Love0eeca282005-07-12 17:06:03 -0400545#ifdef CONFIG_INOTIFY
546 struct list_head inotify_watches; /* watches on this inode */
Ingo Molnard4f9af92006-03-23 03:00:30 -0800547 struct mutex inotify_mutex; /* protects the watches list */
Robert Love0eeca282005-07-12 17:06:03 -0400548#endif
549
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 unsigned long i_state;
551 unsigned long dirtied_when; /* jiffies of first dirtying */
552
553 unsigned int i_flags;
554
555 atomic_t i_writecount;
556 void *i_security;
557 union {
558 void *generic_ip;
559 } u;
560#ifdef __NEED_I_SIZE_ORDERED
561 seqcount_t i_size_seqcount;
562#endif
563};
564
565/*
Ingo Molnarf2eace22006-07-03 00:25:05 -0700566 * inode->i_mutex nesting subclasses for the lock validator:
567 *
568 * 0: the object of the current VFS operation
569 * 1: parent
570 * 2: child/target
571 * 3: quota file
572 *
573 * The locking order between these classes is
Ingo Molnar4df46242006-08-27 01:23:56 -0700574 * parent -> child -> normal -> xattr -> quota
Ingo Molnarf2eace22006-07-03 00:25:05 -0700575 */
576enum inode_i_mutex_lock_class
577{
578 I_MUTEX_NORMAL,
579 I_MUTEX_PARENT,
580 I_MUTEX_CHILD,
Ingo Molnar4df46242006-08-27 01:23:56 -0700581 I_MUTEX_XATTR,
Ingo Molnarf2eace22006-07-03 00:25:05 -0700582 I_MUTEX_QUOTA
583};
584
585/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586 * NOTE: in a 32bit arch with a preemptable kernel and
587 * an UP compile the i_size_read/write must be atomic
588 * with respect to the local cpu (unlike with preempt disabled),
589 * but they don't need to be atomic with respect to other cpus like in
590 * true SMP (so they need either to either locally disable irq around
591 * the read or for example on x86 they can be still implemented as a
592 * cmpxchg8b without the need of the lock prefix). For SMP compiles
593 * and 64bit archs it makes no difference if preempt is enabled or not.
594 */
595static inline loff_t i_size_read(struct inode *inode)
596{
597#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
598 loff_t i_size;
599 unsigned int seq;
600
601 do {
602 seq = read_seqcount_begin(&inode->i_size_seqcount);
603 i_size = inode->i_size;
604 } while (read_seqcount_retry(&inode->i_size_seqcount, seq));
605 return i_size;
606#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
607 loff_t i_size;
608
609 preempt_disable();
610 i_size = inode->i_size;
611 preempt_enable();
612 return i_size;
613#else
614 return inode->i_size;
615#endif
616}
617
618
619static inline void i_size_write(struct inode *inode, loff_t i_size)
620{
621#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
622 write_seqcount_begin(&inode->i_size_seqcount);
623 inode->i_size = i_size;
624 write_seqcount_end(&inode->i_size_seqcount);
625#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
626 preempt_disable();
627 inode->i_size = i_size;
628 preempt_enable();
629#else
630 inode->i_size = i_size;
631#endif
632}
633
634static inline unsigned iminor(struct inode *inode)
635{
636 return MINOR(inode->i_rdev);
637}
638
639static inline unsigned imajor(struct inode *inode)
640{
641 return MAJOR(inode->i_rdev);
642}
643
644extern struct block_device *I_BDEV(struct inode *inode);
645
646struct fown_struct {
647 rwlock_t lock; /* protects pid, uid, euid fields */
648 int pid; /* pid or -pgrp where SIGIO should be sent */
649 uid_t uid, euid; /* uid/euid of process setting the owner */
650 void *security;
651 int signum; /* posix.1b rt signal to be delivered on IO */
652};
653
654/*
655 * Track a single file's readahead state
656 */
657struct file_ra_state {
658 unsigned long start; /* Current window */
659 unsigned long size;
660 unsigned long flags; /* ra flags RA_FLAG_xxx*/
661 unsigned long cache_hit; /* cache hit count*/
662 unsigned long prev_page; /* Cache last read() position */
663 unsigned long ahead_start; /* Ahead window */
664 unsigned long ahead_size;
665 unsigned long ra_pages; /* Maximum readahead window */
666 unsigned long mmap_hit; /* Cache hit stat for mmap accesses */
667 unsigned long mmap_miss; /* Cache miss stat for mmap accesses */
668};
669#define RA_FLAG_MISS 0x01 /* a cache miss occured against this file */
670#define RA_FLAG_INCACHE 0x02 /* file is already in cache */
671
672struct file {
Eric Dumazet2f512012005-10-30 15:02:16 -0800673 /*
674 * fu_list becomes invalid after file_free is called and queued via
675 * fu_rcuhead for RCU freeing
676 */
677 union {
678 struct list_head fu_list;
679 struct rcu_head fu_rcuhead;
680 } f_u;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681 struct dentry *f_dentry;
682 struct vfsmount *f_vfsmnt;
Arjan van de Ven99ac48f2006-03-28 01:56:41 -0800683 const struct file_operations *f_op;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684 atomic_t f_count;
685 unsigned int f_flags;
686 mode_t f_mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687 loff_t f_pos;
688 struct fown_struct f_owner;
689 unsigned int f_uid, f_gid;
690 struct file_ra_state f_ra;
691
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692 unsigned long f_version;
693 void *f_security;
694
695 /* needed for tty driver, and maybe others */
696 void *private_data;
697
698#ifdef CONFIG_EPOLL
699 /* Used by fs/eventpoll.c to link all the hooks to this file */
700 struct list_head f_ep_links;
701 spinlock_t f_ep_lock;
702#endif /* #ifdef CONFIG_EPOLL */
703 struct address_space *f_mapping;
704};
705extern spinlock_t files_lock;
706#define file_list_lock() spin_lock(&files_lock);
707#define file_list_unlock() spin_unlock(&files_lock);
708
Nick Piggin095975d2006-01-08 01:02:19 -0800709#define get_file(x) atomic_inc(&(x)->f_count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710#define file_count(x) atomic_read(&(x)->f_count)
711
712#define MAX_NON_LFS ((1UL<<31) - 1)
713
714/* Page cache limit. The filesystems should put that into their s_maxbytes
715 limits, otherwise bad things can happen in VM. */
716#if BITS_PER_LONG==32
717#define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
718#elif BITS_PER_LONG==64
719#define MAX_LFS_FILESIZE 0x7fffffffffffffffUL
720#endif
721
722#define FL_POSIX 1
723#define FL_FLOCK 2
724#define FL_ACCESS 8 /* not trying to lock, just looking */
Trond Myklebustf475ae92006-06-29 16:38:32 -0400725#define FL_EXISTS 16 /* when unlocking, test for existence */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726#define FL_LEASE 32 /* lease held on this file */
Miklos Szeredi75e1fcc2006-06-23 02:05:12 -0700727#define FL_CLOSE 64 /* unlock on close */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728#define FL_SLEEP 128 /* A blocking lock */
729
730/*
731 * The POSIX file lock owner is determined by
732 * the "struct files_struct" in the thread group
733 * (or NULL for no owner - BSD locks).
734 *
735 * Lockd stuffs a "host" pointer into this.
736 */
737typedef struct files_struct *fl_owner_t;
738
739struct file_lock_operations {
740 void (*fl_insert)(struct file_lock *); /* lock insertion callback */
741 void (*fl_remove)(struct file_lock *); /* lock removal callback */
742 void (*fl_copy_lock)(struct file_lock *, struct file_lock *);
743 void (*fl_release_private)(struct file_lock *);
744};
745
746struct lock_manager_operations {
747 int (*fl_compare_owner)(struct file_lock *, struct file_lock *);
748 void (*fl_notify)(struct file_lock *); /* unblock callback */
749 void (*fl_copy_lock)(struct file_lock *, struct file_lock *);
750 void (*fl_release_private)(struct file_lock *);
751 void (*fl_break)(struct file_lock *);
752 int (*fl_mylease)(struct file_lock *, struct file_lock *);
753 int (*fl_change)(struct file_lock **, int);
754};
755
756/* that will die - we need it for nfs_lock_info */
757#include <linux/nfs_fs_i.h>
758
759struct file_lock {
760 struct file_lock *fl_next; /* singly linked list for this inode */
761 struct list_head fl_link; /* doubly linked list of all locks */
762 struct list_head fl_block; /* circular list of blocked processes */
763 fl_owner_t fl_owner;
764 unsigned int fl_pid;
765 wait_queue_head_t fl_wait;
766 struct file *fl_file;
767 unsigned char fl_flags;
768 unsigned char fl_type;
769 loff_t fl_start;
770 loff_t fl_end;
771
772 struct fasync_struct * fl_fasync; /* for lease break notifications */
773 unsigned long fl_break_time; /* for nonblocking lease breaks */
774
775 struct file_lock_operations *fl_ops; /* Callbacks for filesystems */
776 struct lock_manager_operations *fl_lmops; /* Callbacks for lockmanagers */
777 union {
778 struct nfs_lock_info nfs_fl;
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000779 struct nfs4_lock_info nfs4_fl;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780 } fl_u;
781};
782
783/* The following constant reflects the upper bound of the file/locking space */
784#ifndef OFFSET_MAX
785#define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1)))
786#define OFFSET_MAX INT_LIMIT(loff_t)
787#define OFFT_OFFSET_MAX INT_LIMIT(off_t)
788#endif
789
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790#include <linux/fcntl.h>
791
792extern int fcntl_getlk(struct file *, struct flock __user *);
Peter Staubachc2936212005-07-27 11:45:09 -0700793extern int fcntl_setlk(unsigned int, struct file *, unsigned int,
794 struct flock __user *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795
796#if BITS_PER_LONG == 32
797extern int fcntl_getlk64(struct file *, struct flock64 __user *);
Peter Staubachc2936212005-07-27 11:45:09 -0700798extern int fcntl_setlk64(unsigned int, struct file *, unsigned int,
799 struct flock64 __user *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800#endif
801
802extern void send_sigio(struct fown_struct *fown, int fd, int band);
803extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg);
804extern int fcntl_getlease(struct file *filp);
805
Andrew Mortonf79e2ab2006-03-31 02:30:42 -0800806/* fs/sync.c */
Andrew Mortonf79e2ab2006-03-31 02:30:42 -0800807extern int do_sync_file_range(struct file *file, loff_t offset, loff_t endbyte,
Andrew Morton5246d052006-04-10 22:53:57 -0700808 unsigned int flags);
Andrew Mortonf79e2ab2006-03-31 02:30:42 -0800809
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810/* fs/locks.c */
811extern void locks_init_lock(struct file_lock *);
812extern void locks_copy_lock(struct file_lock *, struct file_lock *);
813extern void locks_remove_posix(struct file *, fl_owner_t);
814extern void locks_remove_flock(struct file *);
Andy Adamson8dc7c312006-03-20 13:44:26 -0500815extern int posix_test_lock(struct file *, struct file_lock *, struct file_lock *);
Andy Adamson5842add2006-03-26 01:37:26 -0800816extern int posix_lock_file_conf(struct file *, struct file_lock *, struct file_lock *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817extern int posix_lock_file(struct file *, struct file_lock *);
818extern int posix_lock_file_wait(struct file *, struct file_lock *);
J. Bruce Fields64a318e2006-01-03 09:55:46 +0100819extern int posix_unblock_lock(struct file *, struct file_lock *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820extern int flock_lock_file_wait(struct file *filp, struct file_lock *fl);
821extern int __break_lease(struct inode *inode, unsigned int flags);
822extern void lease_get_mtime(struct inode *, struct timespec *time);
823extern int setlease(struct file *, long, struct file_lock **);
824extern int lease_modify(struct file_lock **, int);
825extern int lock_may_read(struct inode *, loff_t start, unsigned long count);
826extern int lock_may_write(struct inode *, loff_t start, unsigned long count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827
828struct fasync_struct {
829 int magic;
830 int fa_fd;
831 struct fasync_struct *fa_next; /* singly linked list */
832 struct file *fa_file;
833};
834
835#define FASYNC_MAGIC 0x4601
836
837/* SMP safe fasync helpers: */
838extern int fasync_helper(int, struct file *, int, struct fasync_struct **);
839/* can be called from interrupts */
840extern void kill_fasync(struct fasync_struct **, int, int);
841/* only for net: no internal synchronization */
842extern void __kill_fasync(struct fasync_struct *, int, int);
843
844extern int f_setown(struct file *filp, unsigned long arg, int force);
845extern void f_delown(struct file *filp);
846extern int send_sigurg(struct fown_struct *fown);
847
848/*
849 * Umount options
850 */
851
852#define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */
853#define MNT_DETACH 0x00000002 /* Just detach from the tree */
854#define MNT_EXPIRE 0x00000004 /* Mark for expiry */
855
856extern struct list_head super_blocks;
857extern spinlock_t sb_lock;
858
859#define sb_entry(list) list_entry((list), struct super_block, s_list)
860#define S_BIAS (1<<30)
861struct super_block {
862 struct list_head s_list; /* Keep this first */
863 dev_t s_dev; /* search index; _not_ kdev_t */
864 unsigned long s_blocksize;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865 unsigned char s_blocksize_bits;
866 unsigned char s_dirt;
867 unsigned long long s_maxbytes; /* Max file size */
868 struct file_system_type *s_type;
869 struct super_operations *s_op;
870 struct dquot_operations *dq_op;
871 struct quotactl_ops *s_qcop;
872 struct export_operations *s_export_op;
873 unsigned long s_flags;
874 unsigned long s_magic;
875 struct dentry *s_root;
876 struct rw_semaphore s_umount;
Ingo Molnar7892f2f2006-01-09 15:59:25 -0800877 struct mutex s_lock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878 int s_count;
879 int s_syncing;
880 int s_need_sync_fs;
881 atomic_t s_active;
882 void *s_security;
883 struct xattr_handler **s_xattr;
884
885 struct list_head s_inodes; /* all inodes */
886 struct list_head s_dirty; /* dirty inodes */
887 struct list_head s_io; /* parked for writeback */
888 struct hlist_head s_anon; /* anonymous dentries for (nfs) exporting */
889 struct list_head s_files;
890
891 struct block_device *s_bdev;
892 struct list_head s_instances;
893 struct quota_info s_dquot; /* Diskquota specific options */
894
895 int s_frozen;
896 wait_queue_head_t s_wait_unfrozen;
897
898 char s_id[32]; /* Informational name */
899
900 void *s_fs_info; /* Filesystem private info */
901
902 /*
903 * The next field is for VFS *only*. No filesystems have any business
904 * even looking at it. You had been warned.
905 */
Arjan van de Vena11f3a02006-03-23 03:00:33 -0800906 struct mutex s_vfs_rename_mutex; /* Kludge */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700907
Kalin KOZHUHAROV8ba8e952006-04-01 01:41:22 +0200908 /* Granularity of c/m/atime in ns.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700909 Cannot be worse than a second */
910 u32 s_time_gran;
911};
912
913extern struct timespec current_fs_time(struct super_block *sb);
914
915/*
916 * Snapshotting support.
917 */
918enum {
919 SB_UNFROZEN = 0,
920 SB_FREEZE_WRITE = 1,
921 SB_FREEZE_TRANS = 2,
922};
923
924#define vfs_check_frozen(sb, level) \
925 wait_event((sb)->s_wait_unfrozen, ((sb)->s_frozen < (level)))
926
Jens Axboe22e2c502005-06-27 10:55:12 +0200927static inline void get_fs_excl(void)
928{
929 atomic_inc(&current->fs_excl);
930}
931
932static inline void put_fs_excl(void)
933{
934 atomic_dec(&current->fs_excl);
935}
936
937static inline int has_fs_excl(void)
938{
939 return atomic_read(&current->fs_excl);
940}
941
942
Linus Torvalds1da177e2005-04-16 15:20:36 -0700943/*
944 * Superblock locking.
945 */
946static inline void lock_super(struct super_block * sb)
947{
Jens Axboe22e2c502005-06-27 10:55:12 +0200948 get_fs_excl();
Ingo Molnar7892f2f2006-01-09 15:59:25 -0800949 mutex_lock(&sb->s_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700950}
951
952static inline void unlock_super(struct super_block * sb)
953{
Jens Axboe22e2c502005-06-27 10:55:12 +0200954 put_fs_excl();
Ingo Molnar7892f2f2006-01-09 15:59:25 -0800955 mutex_unlock(&sb->s_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700956}
957
958/*
959 * VFS helper functions..
960 */
Christoph Hellwige4543ed2005-11-08 21:35:04 -0800961extern int vfs_permission(struct nameidata *, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700962extern int vfs_create(struct inode *, struct dentry *, int, struct nameidata *);
963extern int vfs_mkdir(struct inode *, struct dentry *, int);
964extern int vfs_mknod(struct inode *, struct dentry *, int, dev_t);
965extern int vfs_symlink(struct inode *, struct dentry *, const char *, int);
966extern int vfs_link(struct dentry *, struct inode *, struct dentry *);
967extern int vfs_rmdir(struct inode *, struct dentry *);
968extern int vfs_unlink(struct inode *, struct dentry *);
969extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
970
971/*
972 * VFS dentry helper functions.
973 */
974extern void dentry_unhash(struct dentry *dentry);
975
976/*
Christoph Hellwig8c744fb2005-11-08 21:35:04 -0800977 * VFS file helper functions.
978 */
979extern int file_permission(struct file *, int);
980
981/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982 * File types
983 *
984 * NOTE! These match bits 12..15 of stat.st_mode
985 * (ie "(i_mode >> 12) & 15").
986 */
987#define DT_UNKNOWN 0
988#define DT_FIFO 1
989#define DT_CHR 2
990#define DT_DIR 4
991#define DT_BLK 6
992#define DT_REG 8
993#define DT_LNK 10
994#define DT_SOCK 12
995#define DT_WHT 14
996
997#define OSYNC_METADATA (1<<0)
998#define OSYNC_DATA (1<<1)
999#define OSYNC_INODE (1<<2)
1000int generic_osync_inode(struct inode *, struct address_space *, int);
1001
1002/*
1003 * This is the "filldir" function type, used by readdir() to let
1004 * the kernel specify what kind of dirent layout it wants to have.
1005 * This allows the kernel to read directories into kernel space or
1006 * to have different dirent layouts depending on the binary type.
1007 */
1008typedef int (*filldir_t)(void *, const char *, int, loff_t, ino_t, unsigned);
1009
1010struct block_device_operations {
1011 int (*open) (struct inode *, struct file *);
1012 int (*release) (struct inode *, struct file *);
1013 int (*ioctl) (struct inode *, struct file *, unsigned, unsigned long);
Arnd Bergmannbb93e3a2005-06-23 00:10:15 -07001014 long (*unlocked_ioctl) (struct file *, unsigned, unsigned long);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015 long (*compat_ioctl) (struct file *, unsigned, unsigned long);
Carsten Otte420edbc2005-06-23 22:05:23 -07001016 int (*direct_access) (struct block_device *, sector_t, unsigned long *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017 int (*media_changed) (struct gendisk *);
1018 int (*revalidate_disk) (struct gendisk *);
Christoph Hellwiga885c8c2006-01-08 01:02:50 -08001019 int (*getgeo)(struct block_device *, struct hd_geometry *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020 struct module *owner;
1021};
1022
1023/*
1024 * "descriptor" for what we're up to with a read for sendfile().
1025 * This allows us to use the same read code yet
1026 * have multiple different users of the data that
1027 * we read from a file.
1028 *
1029 * The simplest case just copies the data to user
1030 * mode.
1031 */
1032typedef struct {
1033 size_t written;
1034 size_t count;
1035 union {
1036 char __user * buf;
1037 void *data;
1038 } arg;
1039 int error;
1040} read_descriptor_t;
1041
1042typedef int (*read_actor_t)(read_descriptor_t *, struct page *, unsigned long, unsigned long);
1043
1044/* These macros are for out of kernel modules to test that
1045 * the kernel supports the unlocked_ioctl and compat_ioctl
1046 * fields in struct file_operations. */
1047#define HAVE_COMPAT_IOCTL 1
1048#define HAVE_UNLOCKED_IOCTL 1
1049
1050/*
1051 * NOTE:
1052 * read, write, poll, fsync, readv, writev, unlocked_ioctl and compat_ioctl
1053 * can be called without the big kernel lock held in all filesystems.
1054 */
1055struct file_operations {
1056 struct module *owner;
1057 loff_t (*llseek) (struct file *, loff_t, int);
1058 ssize_t (*read) (struct file *, char __user *, size_t, loff_t *);
1059 ssize_t (*aio_read) (struct kiocb *, char __user *, size_t, loff_t);
1060 ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *);
1061 ssize_t (*aio_write) (struct kiocb *, const char __user *, size_t, loff_t);
1062 int (*readdir) (struct file *, void *, filldir_t);
1063 unsigned int (*poll) (struct file *, struct poll_table_struct *);
1064 int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long);
1065 long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);
1066 long (*compat_ioctl) (struct file *, unsigned int, unsigned long);
1067 int (*mmap) (struct file *, struct vm_area_struct *);
1068 int (*open) (struct inode *, struct file *);
Miklos Szeredi75e1fcc2006-06-23 02:05:12 -07001069 int (*flush) (struct file *, fl_owner_t id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001070 int (*release) (struct inode *, struct file *);
1071 int (*fsync) (struct file *, struct dentry *, int datasync);
1072 int (*aio_fsync) (struct kiocb *, int datasync);
1073 int (*fasync) (int, struct file *, int);
1074 int (*lock) (struct file *, int, struct file_lock *);
1075 ssize_t (*readv) (struct file *, const struct iovec *, unsigned long, loff_t *);
1076 ssize_t (*writev) (struct file *, const struct iovec *, unsigned long, loff_t *);
1077 ssize_t (*sendfile) (struct file *, loff_t *, size_t, read_actor_t, void *);
1078 ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int);
1079 unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
1080 int (*check_flags)(int);
1081 int (*dir_notify)(struct file *filp, unsigned long arg);
1082 int (*flock) (struct file *, int, struct file_lock *);
Jens Axboecbb7e572006-04-11 14:57:50 +02001083 ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int);
1084 ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001085};
1086
1087struct inode_operations {
1088 int (*create) (struct inode *,struct dentry *,int, struct nameidata *);
1089 struct dentry * (*lookup) (struct inode *,struct dentry *, struct nameidata *);
1090 int (*link) (struct dentry *,struct inode *,struct dentry *);
1091 int (*unlink) (struct inode *,struct dentry *);
1092 int (*symlink) (struct inode *,struct dentry *,const char *);
1093 int (*mkdir) (struct inode *,struct dentry *,int);
1094 int (*rmdir) (struct inode *,struct dentry *);
1095 int (*mknod) (struct inode *,struct dentry *,int,dev_t);
1096 int (*rename) (struct inode *, struct dentry *,
1097 struct inode *, struct dentry *);
1098 int (*readlink) (struct dentry *, char __user *,int);
Linus Torvaldscc314ee2005-08-19 18:02:56 -07001099 void * (*follow_link) (struct dentry *, struct nameidata *);
1100 void (*put_link) (struct dentry *, struct nameidata *, void *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001101 void (*truncate) (struct inode *);
1102 int (*permission) (struct inode *, int, struct nameidata *);
1103 int (*setattr) (struct dentry *, struct iattr *);
1104 int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *);
1105 int (*setxattr) (struct dentry *, const char *,const void *,size_t,int);
1106 ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t);
1107 ssize_t (*listxattr) (struct dentry *, char *, size_t);
1108 int (*removexattr) (struct dentry *, const char *);
Badari Pulavartyf6b3ec22006-01-06 00:10:38 -08001109 void (*truncate_range)(struct inode *, loff_t, loff_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110};
1111
1112struct seq_file;
1113
1114extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *);
1115extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *);
1116extern ssize_t vfs_readv(struct file *, const struct iovec __user *,
1117 unsigned long, loff_t *);
1118extern ssize_t vfs_writev(struct file *, const struct iovec __user *,
1119 unsigned long, loff_t *);
1120
1121/*
1122 * NOTE: write_inode, delete_inode, clear_inode, put_inode can be called
1123 * without the big kernel lock held in all filesystems.
1124 */
1125struct super_operations {
1126 struct inode *(*alloc_inode)(struct super_block *sb);
1127 void (*destroy_inode)(struct inode *);
1128
1129 void (*read_inode) (struct inode *);
1130
1131 void (*dirty_inode) (struct inode *);
1132 int (*write_inode) (struct inode *, int);
1133 void (*put_inode) (struct inode *);
1134 void (*drop_inode) (struct inode *);
1135 void (*delete_inode) (struct inode *);
1136 void (*put_super) (struct super_block *);
1137 void (*write_super) (struct super_block *);
1138 int (*sync_fs)(struct super_block *sb, int wait);
1139 void (*write_super_lockfs) (struct super_block *);
1140 void (*unlockfs) (struct super_block *);
David Howells726c3342006-06-23 02:02:58 -07001141 int (*statfs) (struct dentry *, struct kstatfs *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001142 int (*remount_fs) (struct super_block *, int *, char *);
1143 void (*clear_inode) (struct inode *);
Trond Myklebust8b512d92006-06-09 09:34:18 -04001144 void (*umount_begin) (struct vfsmount *, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001145
1146 int (*show_options)(struct seq_file *, struct vfsmount *);
Chuck Leverb4629fe2006-03-20 13:44:12 -05001147 int (*show_stats)(struct seq_file *, struct vfsmount *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148
1149 ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t);
1150 ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t);
1151};
1152
1153/* Inode state bits. Protected by inode_lock. */
1154#define I_DIRTY_SYNC 1 /* Not dirty enough for O_DATASYNC */
1155#define I_DIRTY_DATASYNC 2 /* Data-related inode changes pending */
1156#define I_DIRTY_PAGES 4 /* Data-related inode changes pending */
1157#define __I_LOCK 3
1158#define I_LOCK (1 << __I_LOCK)
1159#define I_FREEING 16
1160#define I_CLEAR 32
1161#define I_NEW 64
Alexander Viro991114c2005-06-23 00:09:01 -07001162#define I_WILL_FREE 128
Linus Torvalds1da177e2005-04-16 15:20:36 -07001163
1164#define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)
1165
1166extern void __mark_inode_dirty(struct inode *, int);
1167static inline void mark_inode_dirty(struct inode *inode)
1168{
1169 __mark_inode_dirty(inode, I_DIRTY);
1170}
1171
1172static inline void mark_inode_dirty_sync(struct inode *inode)
1173{
1174 __mark_inode_dirty(inode, I_DIRTY_SYNC);
1175}
1176
Alexey Dobriyan66d21732006-03-23 03:00:51 -08001177static inline void inode_inc_link_count(struct inode *inode)
1178{
1179 inode->i_nlink++;
1180 mark_inode_dirty(inode);
1181}
1182
1183static inline void inode_dec_link_count(struct inode *inode)
1184{
1185 inode->i_nlink--;
1186 mark_inode_dirty(inode);
1187}
1188
Christoph Hellwig869243a2006-01-09 20:52:03 -08001189extern void touch_atime(struct vfsmount *mnt, struct dentry *dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001190static inline void file_accessed(struct file *file)
1191{
1192 if (!(file->f_flags & O_NOATIME))
1193 touch_atime(file->f_vfsmnt, file->f_dentry);
1194}
1195
1196int sync_inode(struct inode *inode, struct writeback_control *wbc);
1197
1198/**
Pavel Pisa4dc3b162005-05-01 08:59:25 -07001199 * struct export_operations - for nfsd to communicate with file systems
1200 * @decode_fh: decode a file handle fragment and return a &struct dentry
1201 * @encode_fh: encode a file handle fragment from a dentry
1202 * @get_name: find the name for a given inode in a given directory
1203 * @get_parent: find the parent of a given directory
1204 * @get_dentry: find a dentry for the inode given a file handle sub-fragment
Randy Dunlap8f2709b2005-11-07 01:01:05 -08001205 * @find_exported_dentry:
1206 * set by the exporting module to a standard helper function.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207 *
1208 * Description:
1209 * The export_operations structure provides a means for nfsd to communicate
1210 * with a particular exported file system - particularly enabling nfsd and
1211 * the filesystem to co-operate when dealing with file handles.
1212 *
Martin Waitz67be2dd2005-05-01 08:59:26 -07001213 * export_operations contains two basic operation for dealing with file
1214 * handles, decode_fh() and encode_fh(), and allows for some other
1215 * operations to be defined which standard helper routines use to get
1216 * specific information from the filesystem.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001217 *
1218 * nfsd encodes information use to determine which filesystem a filehandle
Martin Waitz67be2dd2005-05-01 08:59:26 -07001219 * applies to in the initial part of the file handle. The remainder, termed
1220 * a file handle fragment, is controlled completely by the filesystem. The
1221 * standard helper routines assume that this fragment will contain one or
1222 * two sub-fragments, one which identifies the file, and one which may be
1223 * used to identify the (a) directory containing the file.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001224 *
1225 * In some situations, nfsd needs to get a dentry which is connected into a
Martin Waitz67be2dd2005-05-01 08:59:26 -07001226 * specific part of the file tree. To allow for this, it passes the
1227 * function acceptable() together with a @context which can be used to see
1228 * if the dentry is acceptable. As there can be multiple dentrys for a
1229 * given file, the filesystem should check each one for acceptability before
1230 * looking for the next. As soon as an acceptable one is found, it should
1231 * be returned.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001232 *
1233 * decode_fh:
Martin Waitz67be2dd2005-05-01 08:59:26 -07001234 * @decode_fh is given a &struct super_block (@sb), a file handle fragment
1235 * (@fh, @fh_len) and an acceptability testing function (@acceptable,
1236 * @context). It should return a &struct dentry which refers to the same
1237 * file that the file handle fragment refers to, and which passes the
1238 * acceptability test. If it cannot, it should return a %NULL pointer if
1239 * the file was found but no acceptable &dentries were available, or a
1240 * %ERR_PTR error code indicating why it couldn't be found (e.g. %ENOENT or
1241 * %ENOMEM).
Linus Torvalds1da177e2005-04-16 15:20:36 -07001242 *
1243 * encode_fh:
Martin Waitz67be2dd2005-05-01 08:59:26 -07001244 * @encode_fh should store in the file handle fragment @fh (using at most
1245 * @max_len bytes) information that can be used by @decode_fh to recover the
1246 * file refered to by the &struct dentry @de. If the @connectable flag is
1247 * set, the encode_fh() should store sufficient information so that a good
1248 * attempt can be made to find not only the file but also it's place in the
1249 * filesystem. This typically means storing a reference to de->d_parent in
1250 * the filehandle fragment. encode_fh() should return the number of bytes
1251 * stored or a negative error code such as %-ENOSPC
Linus Torvalds1da177e2005-04-16 15:20:36 -07001252 *
1253 * get_name:
Martin Waitz67be2dd2005-05-01 08:59:26 -07001254 * @get_name should find a name for the given @child in the given @parent
1255 * directory. The name should be stored in the @name (with the
1256 * understanding that it is already pointing to a a %NAME_MAX+1 sized
1257 * buffer. get_name() should return %0 on success, a negative error code
Jes Sorensen1b1dcc12006-01-09 15:59:24 -08001258 * or error. @get_name will be called without @parent->i_mutex held.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001259 *
1260 * get_parent:
Martin Waitz67be2dd2005-05-01 08:59:26 -07001261 * @get_parent should find the parent directory for the given @child which
1262 * is also a directory. In the event that it cannot be found, or storage
1263 * space cannot be allocated, a %ERR_PTR should be returned.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001264 *
1265 * get_dentry:
Martin Waitz67be2dd2005-05-01 08:59:26 -07001266 * Given a &super_block (@sb) and a pointer to a file-system specific inode
1267 * identifier, possibly an inode number, (@inump) get_dentry() should find
1268 * the identified inode and return a dentry for that inode. Any suitable
1269 * dentry can be returned including, if necessary, a new dentry created with
1270 * d_alloc_root. The caller can then find any other extant dentrys by
1271 * following the d_alias links. If a new dentry was created using
1272 * d_alloc_root, DCACHE_NFSD_DISCONNECTED should be set, and the dentry
1273 * should be d_rehash()ed.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001274 *
Martin Waitz67be2dd2005-05-01 08:59:26 -07001275 * If the inode cannot be found, either a %NULL pointer or an %ERR_PTR code
1276 * can be returned. The @inump will be whatever was passed to
1277 * nfsd_find_fh_dentry() in either the @obj or @parent parameters.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001278 *
1279 * Locking rules:
Jes Sorensen1b1dcc12006-01-09 15:59:24 -08001280 * get_parent is called with child->d_inode->i_mutex down
Martin Waitz67be2dd2005-05-01 08:59:26 -07001281 * get_name is not (which is possibly inconsistent)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001282 */
1283
1284struct export_operations {
1285 struct dentry *(*decode_fh)(struct super_block *sb, __u32 *fh, int fh_len, int fh_type,
1286 int (*acceptable)(void *context, struct dentry *de),
1287 void *context);
1288 int (*encode_fh)(struct dentry *de, __u32 *fh, int *max_len,
1289 int connectable);
1290
1291 /* the following are only called from the filesystem itself */
1292 int (*get_name)(struct dentry *parent, char *name,
1293 struct dentry *child);
1294 struct dentry * (*get_parent)(struct dentry *child);
1295 struct dentry * (*get_dentry)(struct super_block *sb, void *inump);
1296
1297 /* This is set by the exporting module to a standard helper */
1298 struct dentry * (*find_exported_dentry)(
1299 struct super_block *sb, void *obj, void *parent,
1300 int (*acceptable)(void *context, struct dentry *de),
1301 void *context);
1302
1303
1304};
1305
1306extern struct dentry *
1307find_exported_dentry(struct super_block *sb, void *obj, void *parent,
1308 int (*acceptable)(void *context, struct dentry *de),
1309 void *context);
1310
1311struct file_system_type {
1312 const char *name;
1313 int fs_flags;
David Howells454e2392006-06-23 02:02:57 -07001314 int (*get_sb) (struct file_system_type *, int,
1315 const char *, void *, struct vfsmount *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001316 void (*kill_sb) (struct super_block *);
1317 struct module *owner;
1318 struct file_system_type * next;
1319 struct list_head fs_supers;
Ingo Molnarcf516242006-07-03 00:25:27 -07001320 struct lock_class_key s_lock_key;
Arjan van de Ven897c6ff2006-07-03 00:25:28 -07001321 struct lock_class_key s_umount_key;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001322};
1323
David Howells454e2392006-06-23 02:02:57 -07001324extern int get_sb_bdev(struct file_system_type *fs_type,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001325 int flags, const char *dev_name, void *data,
David Howells454e2392006-06-23 02:02:57 -07001326 int (*fill_super)(struct super_block *, void *, int),
1327 struct vfsmount *mnt);
1328extern int get_sb_single(struct file_system_type *fs_type,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001329 int flags, void *data,
David Howells454e2392006-06-23 02:02:57 -07001330 int (*fill_super)(struct super_block *, void *, int),
1331 struct vfsmount *mnt);
1332extern int get_sb_nodev(struct file_system_type *fs_type,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001333 int flags, void *data,
David Howells454e2392006-06-23 02:02:57 -07001334 int (*fill_super)(struct super_block *, void *, int),
1335 struct vfsmount *mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001336void generic_shutdown_super(struct super_block *sb);
1337void kill_block_super(struct super_block *sb);
1338void kill_anon_super(struct super_block *sb);
1339void kill_litter_super(struct super_block *sb);
1340void deactivate_super(struct super_block *sb);
1341int set_anon_super(struct super_block *s, void *data);
1342struct super_block *sget(struct file_system_type *type,
1343 int (*test)(struct super_block *,void *),
1344 int (*set)(struct super_block *,void *),
1345 void *data);
David Howells454e2392006-06-23 02:02:57 -07001346extern int get_sb_pseudo(struct file_system_type *, char *,
1347 struct super_operations *ops, unsigned long,
1348 struct vfsmount *mnt);
1349extern int simple_set_mnt(struct vfsmount *mnt, struct super_block *sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001350int __put_super(struct super_block *sb);
1351int __put_super_and_need_restart(struct super_block *sb);
1352void unnamed_dev_init(void);
1353
1354/* Alas, no aliases. Too much hassle with bringing module.h everywhere */
1355#define fops_get(fops) \
1356 (((fops) && try_module_get((fops)->owner) ? (fops) : NULL))
1357#define fops_put(fops) \
1358 do { if (fops) module_put((fops)->owner); } while(0)
1359
1360extern int register_filesystem(struct file_system_type *);
1361extern int unregister_filesystem(struct file_system_type *);
1362extern struct vfsmount *kern_mount(struct file_system_type *);
1363extern int may_umount_tree(struct vfsmount *);
1364extern int may_umount(struct vfsmount *);
Ram Paia05964f2005-11-07 17:20:17 -05001365extern void umount_tree(struct vfsmount *, int, struct list_head *);
Ram Paib90fa9a2005-11-07 17:19:50 -05001366extern void release_mounts(struct list_head *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001367extern long do_mount(char *, char *, char *, unsigned long, void *);
Ram Paib90fa9a2005-11-07 17:19:50 -05001368extern struct vfsmount *copy_tree(struct vfsmount *, struct dentry *, int);
1369extern void mnt_set_mountpoint(struct vfsmount *, struct dentry *,
1370 struct vfsmount *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001371
David Howells726c3342006-06-23 02:02:58 -07001372extern int vfs_statfs(struct dentry *, struct kstatfs *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001373
Miklos Szeredif87fd4c2006-01-16 22:14:23 -08001374/* /sys/fs */
1375extern struct subsystem fs_subsys;
1376
Linus Torvalds1da177e2005-04-16 15:20:36 -07001377#define FLOCK_VERIFY_READ 1
1378#define FLOCK_VERIFY_WRITE 2
1379
1380extern int locks_mandatory_locked(struct inode *);
1381extern int locks_mandatory_area(int, struct inode *, struct file *, loff_t, size_t);
1382
1383/*
1384 * Candidates for mandatory locking have the setgid bit set
1385 * but no group execute bit - an otherwise meaningless combination.
1386 */
1387#define MANDATORY_LOCK(inode) \
1388 (IS_MANDLOCK(inode) && ((inode)->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
1389
1390static inline int locks_verify_locked(struct inode *inode)
1391{
1392 if (MANDATORY_LOCK(inode))
1393 return locks_mandatory_locked(inode);
1394 return 0;
1395}
1396
1397extern int rw_verify_area(int, struct file *, loff_t *, size_t);
1398
1399static inline int locks_verify_truncate(struct inode *inode,
1400 struct file *filp,
1401 loff_t size)
1402{
1403 if (inode->i_flock && MANDATORY_LOCK(inode))
1404 return locks_mandatory_area(
1405 FLOCK_VERIFY_WRITE, inode, filp,
1406 size < inode->i_size ? size : inode->i_size,
1407 (size < inode->i_size ? inode->i_size - size
1408 : size - inode->i_size)
1409 );
1410 return 0;
1411}
1412
1413static inline int break_lease(struct inode *inode, unsigned int mode)
1414{
1415 if (inode->i_flock)
1416 return __break_lease(inode, mode);
1417 return 0;
1418}
1419
1420/* fs/open.c */
1421
NeilBrown4a301312006-01-08 01:02:39 -08001422extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs,
1423 struct file *filp);
Ulrich Drepper5590ff02006-01-18 17:43:53 -08001424extern long do_sys_open(int fdf, const char __user *filename, int flags,
1425 int mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001426extern struct file *filp_open(const char *, int, int);
1427extern struct file * dentry_open(struct dentry *, struct vfsmount *, int);
1428extern int filp_close(struct file *, fl_owner_t id);
1429extern char * getname(const char __user *);
1430
1431/* fs/dcache.c */
1432extern void __init vfs_caches_init_early(void);
1433extern void __init vfs_caches_init(unsigned long);
1434
1435#define __getname() kmem_cache_alloc(names_cachep, SLAB_KERNEL)
1436#define __putname(name) kmem_cache_free(names_cachep, (void *)(name))
1437#ifndef CONFIG_AUDITSYSCALL
1438#define putname(name) __putname(name)
1439#else
1440extern void putname(const char *name);
1441#endif
1442
1443extern int register_blkdev(unsigned int, const char *);
1444extern int unregister_blkdev(unsigned int, const char *);
1445extern struct block_device *bdget(dev_t);
1446extern void bd_set_size(struct block_device *, loff_t size);
1447extern void bd_forget(struct inode *inode);
1448extern void bdput(struct block_device *);
1449extern struct block_device *open_by_devnum(dev_t, unsigned);
Ingo Molnar663d4402006-07-03 00:25:33 -07001450extern struct block_device *open_partition_by_devnum(dev_t, unsigned);
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08001451extern const struct file_operations def_blk_fops;
Christoph Hellwigf5e54d62006-06-28 04:26:44 -07001452extern const struct address_space_operations def_blk_aops;
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08001453extern const struct file_operations def_chr_fops;
1454extern const struct file_operations bad_sock_fops;
1455extern const struct file_operations def_fifo_fops;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001456extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long);
1457extern int blkdev_ioctl(struct inode *, struct file *, unsigned, unsigned long);
1458extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long);
1459extern int blkdev_get(struct block_device *, mode_t, unsigned);
1460extern int blkdev_put(struct block_device *);
Ingo Molnar663d4402006-07-03 00:25:33 -07001461extern int blkdev_put_partition(struct block_device *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001462extern int bd_claim(struct block_device *, void *);
1463extern void bd_release(struct block_device *);
Jun'ichi Nomura641dc632006-03-27 01:17:57 -08001464#ifdef CONFIG_SYSFS
1465extern int bd_claim_by_disk(struct block_device *, void *, struct gendisk *);
1466extern void bd_release_from_disk(struct block_device *, struct gendisk *);
1467#else
1468#define bd_claim_by_disk(bdev, holder, disk) bd_claim(bdev, holder)
1469#define bd_release_from_disk(bdev, disk) bd_release(bdev)
1470#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001471
1472/* fs/char_dev.c */
Joe Korty68eef3b2006-03-31 02:30:32 -08001473#define CHRDEV_MAJOR_HASH_SIZE 255
Linus Torvalds1da177e2005-04-16 15:20:36 -07001474extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *);
1475extern int register_chrdev_region(dev_t, unsigned, const char *);
1476extern int register_chrdev(unsigned int, const char *,
Arjan van de Ven99ac48f2006-03-28 01:56:41 -08001477 const struct file_operations *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001478extern int unregister_chrdev(unsigned int, const char *);
1479extern void unregister_chrdev_region(dev_t, unsigned);
1480extern int chrdev_open(struct inode *, struct file *);
Joe Korty68eef3b2006-03-31 02:30:32 -08001481extern void chrdev_show(struct seq_file *,off_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001482
1483/* fs/block_dev.c */
Joe Korty68eef3b2006-03-31 02:30:32 -08001484#define BLKDEV_MAJOR_HASH_SIZE 255
Linus Torvalds1da177e2005-04-16 15:20:36 -07001485#define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
1486extern const char *__bdevname(dev_t, char *buffer);
1487extern const char *bdevname(struct block_device *bdev, char *buffer);
1488extern struct block_device *lookup_bdev(const char *);
1489extern struct block_device *open_bdev_excl(const char *, int, void *);
1490extern void close_bdev_excl(struct block_device *);
Joe Korty68eef3b2006-03-31 02:30:32 -08001491extern void blkdev_show(struct seq_file *,off_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001492
1493extern void init_special_inode(struct inode *, umode_t, dev_t);
1494
1495/* Invalid inode operations -- fs/bad_inode.c */
1496extern void make_bad_inode(struct inode *);
1497extern int is_bad_inode(struct inode *);
1498
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08001499extern const struct file_operations read_fifo_fops;
1500extern const struct file_operations write_fifo_fops;
1501extern const struct file_operations rdwr_fifo_fops;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001502
1503extern int fs_may_remount_ro(struct super_block *);
1504
1505/*
1506 * return READ, READA, or WRITE
1507 */
1508#define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK))
1509
1510/*
1511 * return data direction, READ or WRITE
1512 */
1513#define bio_data_dir(bio) ((bio)->bi_rw & 1)
1514
1515extern int check_disk_change(struct block_device *);
1516extern int invalidate_inodes(struct super_block *);
Christoph Hellwig2ef41632005-05-05 16:15:59 -07001517extern int __invalidate_device(struct block_device *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001518extern int invalidate_partition(struct gendisk *, int);
1519unsigned long invalidate_mapping_pages(struct address_space *mapping,
1520 pgoff_t start, pgoff_t end);
1521unsigned long invalidate_inode_pages(struct address_space *mapping);
1522static inline void invalidate_remote_inode(struct inode *inode)
1523{
1524 if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1525 S_ISLNK(inode->i_mode))
1526 invalidate_inode_pages(inode->i_mapping);
1527}
1528extern int invalidate_inode_pages2(struct address_space *mapping);
1529extern int invalidate_inode_pages2_range(struct address_space *mapping,
1530 pgoff_t start, pgoff_t end);
1531extern int write_inode_now(struct inode *, int);
1532extern int filemap_fdatawrite(struct address_space *);
1533extern int filemap_flush(struct address_space *);
1534extern int filemap_fdatawait(struct address_space *);
1535extern int filemap_write_and_wait(struct address_space *mapping);
1536extern int filemap_write_and_wait_range(struct address_space *mapping,
1537 loff_t lstart, loff_t lend);
Andrew Mortonebcf28e2006-03-24 03:18:04 -08001538extern int wait_on_page_writeback_range(struct address_space *mapping,
1539 pgoff_t start, pgoff_t end);
1540extern int __filemap_fdatawrite_range(struct address_space *mapping,
1541 loff_t start, loff_t end, int sync_mode);
1542
Andrew Morton18e79b42006-03-24 03:18:14 -08001543extern long do_fsync(struct file *file, int datasync);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001544extern void sync_supers(void);
1545extern void sync_filesystems(int wait);
1546extern void emergency_sync(void);
1547extern void emergency_remount(void);
1548extern int do_remount_sb(struct super_block *sb, int flags,
1549 void *data, int force);
1550extern sector_t bmap(struct inode *, sector_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001551extern int notify_change(struct dentry *, struct iattr *);
1552extern int permission(struct inode *, int, struct nameidata *);
1553extern int generic_permission(struct inode *, int,
1554 int (*check_acl)(struct inode *, int));
1555
1556extern int get_write_access(struct inode *);
1557extern int deny_write_access(struct file *);
1558static inline void put_write_access(struct inode * inode)
1559{
1560 atomic_dec(&inode->i_writecount);
1561}
1562static inline void allow_write_access(struct file *file)
1563{
1564 if (file)
1565 atomic_inc(&file->f_dentry->d_inode->i_writecount);
1566}
1567extern int do_pipe(int *);
1568
Ulrich Drepper5590ff02006-01-18 17:43:53 -08001569extern int open_namei(int dfd, const char *, int, int, struct nameidata *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001570extern int may_open(struct nameidata *, int, int);
1571
1572extern int kernel_read(struct file *, unsigned long, char *, unsigned long);
1573extern struct file * open_exec(const char *);
1574
1575/* fs/dcache.c -- generic fs support functions */
1576extern int is_subdir(struct dentry *, struct dentry *);
1577extern ino_t find_inode_number(struct dentry *, struct qstr *);
1578
1579#include <linux/err.h>
1580
1581/* needed for stackable file system support */
1582extern loff_t default_llseek(struct file *file, loff_t offset, int origin);
1583
1584extern loff_t vfs_llseek(struct file *file, loff_t offset, int origin);
1585
1586extern void inode_init_once(struct inode *);
1587extern void iput(struct inode *);
1588extern struct inode * igrab(struct inode *);
1589extern ino_t iunique(struct super_block *, ino_t);
1590extern int inode_needs_sync(struct inode *inode);
1591extern void generic_delete_inode(struct inode *inode);
Mark Fashehcb2c0232005-07-07 17:56:03 -07001592extern void generic_drop_inode(struct inode *inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001593
Anton Altaparmakov88bd5122005-07-13 01:10:44 -07001594extern struct inode *ilookup5_nowait(struct super_block *sb,
1595 unsigned long hashval, int (*test)(struct inode *, void *),
1596 void *data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001597extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval,
1598 int (*test)(struct inode *, void *), void *data);
1599extern struct inode *ilookup(struct super_block *sb, unsigned long ino);
1600
1601extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *);
1602extern struct inode * iget_locked(struct super_block *, unsigned long);
1603extern void unlock_new_inode(struct inode *);
1604
1605static inline struct inode *iget(struct super_block *sb, unsigned long ino)
1606{
1607 struct inode *inode = iget_locked(sb, ino);
1608
1609 if (inode && (inode->i_state & I_NEW)) {
1610 sb->s_op->read_inode(inode);
1611 unlock_new_inode(inode);
1612 }
1613
1614 return inode;
1615}
1616
1617extern void __iget(struct inode * inode);
1618extern void clear_inode(struct inode *);
1619extern void destroy_inode(struct inode *);
1620extern struct inode *new_inode(struct super_block *);
1621extern int remove_suid(struct dentry *);
1622extern void remove_dquot_ref(struct super_block *, int, struct list_head *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001623
1624extern void __insert_inode_hash(struct inode *, unsigned long hashval);
1625extern void remove_inode_hash(struct inode *);
1626static inline void insert_inode_hash(struct inode *inode) {
1627 __insert_inode_hash(inode, inode->i_ino);
1628}
1629
1630extern struct file * get_empty_filp(void);
1631extern void file_move(struct file *f, struct list_head *list);
1632extern void file_kill(struct file *f);
1633struct bio;
1634extern void submit_bio(int, struct bio *);
1635extern int bdev_read_only(struct block_device *);
1636extern int set_blocksize(struct block_device *, int);
1637extern int sb_set_blocksize(struct super_block *, int);
1638extern int sb_min_blocksize(struct super_block *, int);
1639
1640extern int generic_file_mmap(struct file *, struct vm_area_struct *);
1641extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *);
1642extern int file_read_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size);
1643extern int file_send_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size);
1644extern ssize_t generic_file_read(struct file *, char __user *, size_t, loff_t *);
1645int generic_write_checks(struct file *file, loff_t *pos, size_t *count, int isblk);
1646extern ssize_t generic_file_write(struct file *, const char __user *, size_t, loff_t *);
1647extern ssize_t generic_file_aio_read(struct kiocb *, char __user *, size_t, loff_t);
1648extern ssize_t __generic_file_aio_read(struct kiocb *, const struct iovec *, unsigned long, loff_t *);
1649extern ssize_t generic_file_aio_write(struct kiocb *, const char __user *, size_t, loff_t);
1650extern ssize_t generic_file_aio_write_nolock(struct kiocb *, const struct iovec *,
1651 unsigned long, loff_t *);
1652extern ssize_t generic_file_direct_write(struct kiocb *, const struct iovec *,
1653 unsigned long *, loff_t, loff_t *, size_t, size_t);
1654extern ssize_t generic_file_buffered_write(struct kiocb *, const struct iovec *,
1655 unsigned long, loff_t, loff_t *, size_t, ssize_t);
1656extern ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos);
1657extern ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos);
1658ssize_t generic_file_write_nolock(struct file *file, const struct iovec *iov,
1659 unsigned long nr_segs, loff_t *ppos);
1660extern ssize_t generic_file_sendfile(struct file *, loff_t *, size_t, read_actor_t, void *);
1661extern void do_generic_mapping_read(struct address_space *mapping,
1662 struct file_ra_state *, struct file *,
1663 loff_t *, read_descriptor_t *, read_actor_t);
Andrew Morton88e6fae2006-04-11 13:59:36 +02001664
1665/* fs/splice.c */
Jens Axboecbb7e572006-04-11 14:57:50 +02001666extern ssize_t generic_file_splice_read(struct file *, loff_t *,
Andrew Morton88e6fae2006-04-11 13:59:36 +02001667 struct pipe_inode_info *, size_t, unsigned int);
1668extern ssize_t generic_file_splice_write(struct pipe_inode_info *,
Jens Axboecbb7e572006-04-11 14:57:50 +02001669 struct file *, loff_t *, size_t, unsigned int);
Andrew Morton88e6fae2006-04-11 13:59:36 +02001670extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe,
Jens Axboecbb7e572006-04-11 14:57:50 +02001671 struct file *out, loff_t *, size_t len, unsigned int flags);
1672extern long do_splice_direct(struct file *in, loff_t *ppos, struct file *out,
Andrew Morton88e6fae2006-04-11 13:59:36 +02001673 size_t len, unsigned int flags);
1674
Linus Torvalds1da177e2005-04-16 15:20:36 -07001675extern void
1676file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001677extern ssize_t generic_file_readv(struct file *filp, const struct iovec *iov,
1678 unsigned long nr_segs, loff_t *ppos);
1679ssize_t generic_file_writev(struct file *filp, const struct iovec *iov,
1680 unsigned long nr_segs, loff_t *ppos);
1681extern loff_t no_llseek(struct file *file, loff_t offset, int origin);
1682extern loff_t generic_file_llseek(struct file *file, loff_t offset, int origin);
1683extern loff_t remote_llseek(struct file *file, loff_t offset, int origin);
1684extern int generic_file_open(struct inode * inode, struct file * filp);
1685extern int nonseekable_open(struct inode * inode, struct file * filp);
1686
Carsten Otteceffc072005-06-23 22:05:25 -07001687#ifdef CONFIG_FS_XIP
Carsten Otteeb6fe0c2005-06-23 22:05:28 -07001688extern ssize_t xip_file_read(struct file *filp, char __user *buf, size_t len,
1689 loff_t *ppos);
Carsten Otteceffc072005-06-23 22:05:25 -07001690extern ssize_t xip_file_sendfile(struct file *in_file, loff_t *ppos,
1691 size_t count, read_actor_t actor,
1692 void *target);
1693extern int xip_file_mmap(struct file * file, struct vm_area_struct * vma);
Carsten Otteeb6fe0c2005-06-23 22:05:28 -07001694extern ssize_t xip_file_write(struct file *filp, const char __user *buf,
1695 size_t len, loff_t *ppos);
Carsten Otteceffc072005-06-23 22:05:25 -07001696extern int xip_truncate_page(struct address_space *mapping, loff_t from);
Carsten Otte6d791252005-06-23 22:05:26 -07001697#else
1698static inline int xip_truncate_page(struct address_space *mapping, loff_t from)
1699{
1700 return 0;
1701}
Carsten Otteceffc072005-06-23 22:05:25 -07001702#endif
1703
Linus Torvalds1da177e2005-04-16 15:20:36 -07001704static inline void do_generic_file_read(struct file * filp, loff_t *ppos,
1705 read_descriptor_t * desc,
1706 read_actor_t actor)
1707{
1708 do_generic_mapping_read(filp->f_mapping,
1709 &filp->f_ra,
1710 filp,
1711 ppos,
1712 desc,
1713 actor);
1714}
1715
1716ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
1717 struct block_device *bdev, const struct iovec *iov, loff_t offset,
Badari Pulavarty1d8fa7a2006-03-26 01:38:02 -08001718 unsigned long nr_segs, get_block_t get_block, dio_iodone_t end_io,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001719 int lock_type);
1720
1721enum {
1722 DIO_LOCKING = 1, /* need locking between buffered and direct access */
1723 DIO_NO_LOCKING, /* bdev; no locking at all between buffered/direct */
1724 DIO_OWN_LOCKING, /* filesystem locks buffered and direct internally */
1725};
1726
1727static inline ssize_t blockdev_direct_IO(int rw, struct kiocb *iocb,
1728 struct inode *inode, struct block_device *bdev, const struct iovec *iov,
Badari Pulavarty1d8fa7a2006-03-26 01:38:02 -08001729 loff_t offset, unsigned long nr_segs, get_block_t get_block,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001730 dio_iodone_t end_io)
1731{
1732 return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
Badari Pulavarty1d8fa7a2006-03-26 01:38:02 -08001733 nr_segs, get_block, end_io, DIO_LOCKING);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001734}
1735
1736static inline ssize_t blockdev_direct_IO_no_locking(int rw, struct kiocb *iocb,
1737 struct inode *inode, struct block_device *bdev, const struct iovec *iov,
Badari Pulavarty1d8fa7a2006-03-26 01:38:02 -08001738 loff_t offset, unsigned long nr_segs, get_block_t get_block,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001739 dio_iodone_t end_io)
1740{
1741 return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
Badari Pulavarty1d8fa7a2006-03-26 01:38:02 -08001742 nr_segs, get_block, end_io, DIO_NO_LOCKING);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001743}
1744
1745static inline ssize_t blockdev_direct_IO_own_locking(int rw, struct kiocb *iocb,
1746 struct inode *inode, struct block_device *bdev, const struct iovec *iov,
Badari Pulavarty1d8fa7a2006-03-26 01:38:02 -08001747 loff_t offset, unsigned long nr_segs, get_block_t get_block,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001748 dio_iodone_t end_io)
1749{
1750 return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
Badari Pulavarty1d8fa7a2006-03-26 01:38:02 -08001751 nr_segs, get_block, end_io, DIO_OWN_LOCKING);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001752}
1753
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08001754extern const struct file_operations generic_ro_fops;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001755
1756#define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))
1757
1758extern int vfs_readlink(struct dentry *, char __user *, int, const char *);
1759extern int vfs_follow_link(struct nameidata *, const char *);
1760extern int page_readlink(struct dentry *, char __user *, int);
Linus Torvaldscc314ee2005-08-19 18:02:56 -07001761extern void *page_follow_link_light(struct dentry *, struct nameidata *);
1762extern void page_put_link(struct dentry *, struct nameidata *, void *);
Kirill Korotaev0adb25d2006-03-11 03:27:13 -08001763extern int __page_symlink(struct inode *inode, const char *symname, int len,
1764 gfp_t gfp_mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001765extern int page_symlink(struct inode *inode, const char *symname, int len);
1766extern struct inode_operations page_symlink_inode_operations;
1767extern int generic_readlink(struct dentry *, char __user *, int);
1768extern void generic_fillattr(struct inode *, struct kstat *);
1769extern int vfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
1770void inode_add_bytes(struct inode *inode, loff_t bytes);
1771void inode_sub_bytes(struct inode *inode, loff_t bytes);
1772loff_t inode_get_bytes(struct inode *inode);
1773void inode_set_bytes(struct inode *inode, loff_t bytes);
1774
1775extern int vfs_readdir(struct file *, filldir_t, void *);
1776
1777extern int vfs_stat(char __user *, struct kstat *);
1778extern int vfs_lstat(char __user *, struct kstat *);
Ulrich Drepper5590ff02006-01-18 17:43:53 -08001779extern int vfs_stat_fd(int dfd, char __user *, struct kstat *);
1780extern int vfs_lstat_fd(int dfd, char __user *, struct kstat *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001781extern int vfs_fstat(unsigned int, struct kstat *);
1782
1783extern int vfs_ioctl(struct file *, unsigned int, unsigned int, unsigned long);
1784
1785extern struct file_system_type *get_fs_type(const char *name);
1786extern struct super_block *get_super(struct block_device *);
1787extern struct super_block *user_get_super(dev_t);
1788extern void drop_super(struct super_block *sb);
1789
1790extern int dcache_dir_open(struct inode *, struct file *);
1791extern int dcache_dir_close(struct inode *, struct file *);
1792extern loff_t dcache_dir_lseek(struct file *, loff_t, int);
1793extern int dcache_readdir(struct file *, void *, filldir_t);
1794extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *);
David Howells726c3342006-06-23 02:02:58 -07001795extern int simple_statfs(struct dentry *, struct kstatfs *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001796extern int simple_link(struct dentry *, struct inode *, struct dentry *);
1797extern int simple_unlink(struct inode *, struct dentry *);
1798extern int simple_rmdir(struct inode *, struct dentry *);
1799extern int simple_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
1800extern int simple_sync_file(struct file *, struct dentry *, int);
1801extern int simple_empty(struct dentry *);
1802extern int simple_readpage(struct file *file, struct page *page);
1803extern int simple_prepare_write(struct file *file, struct page *page,
1804 unsigned offset, unsigned to);
1805extern int simple_commit_write(struct file *file, struct page *page,
1806 unsigned offset, unsigned to);
1807
1808extern struct dentry *simple_lookup(struct inode *, struct dentry *, struct nameidata *);
1809extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *);
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08001810extern const struct file_operations simple_dir_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001811extern struct inode_operations simple_dir_inode_operations;
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08001812struct tree_descr { char *name; const struct file_operations *ops; int mode; };
Linus Torvalds1da177e2005-04-16 15:20:36 -07001813struct dentry *d_alloc_name(struct dentry *, const char *);
1814extern int simple_fill_super(struct super_block *, int, struct tree_descr *);
Trond Myklebust1f5ce9e2006-06-09 09:34:16 -04001815extern int simple_pin_fs(struct file_system_type *, struct vfsmount **mount, int *count);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001816extern void simple_release_fs(struct vfsmount **mount, int *count);
1817
1818extern ssize_t simple_read_from_buffer(void __user *, size_t, loff_t *, const void *, size_t);
1819
Christoph Lametere965f962006-02-01 03:05:41 -08001820#ifdef CONFIG_MIGRATION
Christoph Lameter2d1db3b2006-06-23 02:03:33 -07001821extern int buffer_migrate_page(struct address_space *,
1822 struct page *, struct page *);
Christoph Lametere965f962006-02-01 03:05:41 -08001823#else
1824#define buffer_migrate_page NULL
1825#endif
1826
Linus Torvalds1da177e2005-04-16 15:20:36 -07001827extern int inode_change_ok(struct inode *, struct iattr *);
1828extern int __must_check inode_setattr(struct inode *, struct iattr *);
1829
Christoph Hellwig870f4812006-01-09 20:52:01 -08001830extern void file_update_time(struct file *file);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001831
1832static inline ino_t parent_ino(struct dentry *dentry)
1833{
1834 ino_t res;
1835
1836 spin_lock(&dentry->d_lock);
1837 res = dentry->d_parent->d_inode->i_ino;
1838 spin_unlock(&dentry->d_lock);
1839 return res;
1840}
1841
1842/* kernel/fork.c */
1843extern int unshare_files(void);
1844
1845/* Transaction based IO helpers */
1846
1847/*
1848 * An argresp is stored in an allocated page and holds the
1849 * size of the argument or response, along with its content
1850 */
1851struct simple_transaction_argresp {
1852 ssize_t size;
1853 char data[0];
1854};
1855
1856#define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp))
1857
1858char *simple_transaction_get(struct file *file, const char __user *buf,
1859 size_t size);
1860ssize_t simple_transaction_read(struct file *file, char __user *buf,
1861 size_t size, loff_t *pos);
1862int simple_transaction_release(struct inode *inode, struct file *file);
1863
1864static inline void simple_transaction_set(struct file *file, size_t n)
1865{
1866 struct simple_transaction_argresp *ar = file->private_data;
1867
1868 BUG_ON(n > SIMPLE_TRANSACTION_LIMIT);
1869
1870 /*
1871 * The barrier ensures that ar->size will really remain zero until
1872 * ar->data is ready for reading.
1873 */
1874 smp_mb();
1875 ar->size = n;
1876}
1877
Arnd Bergmannacaefc22005-05-18 14:40:59 +02001878/*
1879 * simple attribute files
1880 *
1881 * These attributes behave similar to those in sysfs:
1882 *
1883 * Writing to an attribute immediately sets a value, an open file can be
1884 * written to multiple times.
1885 *
1886 * Reading from an attribute creates a buffer from the value that might get
1887 * read with multiple read calls. When the attribute has been read
1888 * completely, no further read calls are possible until the file is opened
1889 * again.
1890 *
1891 * All attributes contain a text representation of a numeric value
1892 * that are accessed with the get() and set() functions.
1893 */
1894#define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \
1895static int __fops ## _open(struct inode *inode, struct file *file) \
1896{ \
1897 __simple_attr_check_format(__fmt, 0ull); \
1898 return simple_attr_open(inode, file, __get, __set, __fmt); \
1899} \
1900static struct file_operations __fops = { \
1901 .owner = THIS_MODULE, \
1902 .open = __fops ## _open, \
1903 .release = simple_attr_close, \
1904 .read = simple_attr_read, \
1905 .write = simple_attr_write, \
1906};
1907
1908static inline void __attribute__((format(printf, 1, 2)))
1909__simple_attr_check_format(const char *fmt, ...)
1910{
1911 /* don't do anything, just let the compiler check the arguments; */
1912}
1913
1914int simple_attr_open(struct inode *inode, struct file *file,
1915 u64 (*get)(void *), void (*set)(void *, u64),
1916 const char *fmt);
1917int simple_attr_close(struct inode *inode, struct file *file);
1918ssize_t simple_attr_read(struct file *file, char __user *buf,
1919 size_t len, loff_t *ppos);
1920ssize_t simple_attr_write(struct file *file, const char __user *buf,
1921 size_t len, loff_t *ppos);
1922
1923
Linus Torvalds1da177e2005-04-16 15:20:36 -07001924#ifdef CONFIG_SECURITY
1925static inline char *alloc_secdata(void)
1926{
1927 return (char *)get_zeroed_page(GFP_KERNEL);
1928}
1929
1930static inline void free_secdata(void *secdata)
1931{
1932 free_page((unsigned long)secdata);
1933}
1934#else
1935static inline char *alloc_secdata(void)
1936{
1937 return (char *)1;
1938}
1939
1940static inline void free_secdata(void *secdata)
1941{ }
1942#endif /* CONFIG_SECURITY */
1943
1944#endif /* __KERNEL__ */
1945#endif /* _LINUX_FS_H */