5 * This file has definitions for some important file table
9 #include <linux/limits.h>
10 #include <linux/ioctl.h>
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.
18 * Some programs (notably those using select()) may have to be
19 * recompiled to take full advantage of the new limits..
22 /* Fixed constants first: */
24 #define NR_OPEN (1024*1024) /* Absolute upper limit on fd num */
25 #define INR_OPEN 1024 /* Initial setting for nfile rlimits */
27 #define BLOCK_SIZE_BITS 10
28 #define BLOCK_SIZE (1<<BLOCK_SIZE_BITS)
30 #define SEEK_SET 0 /* seek relative to beginning of file */
31 #define SEEK_CUR 1 /* seek relative to current file position */
32 #define SEEK_END 2 /* seek relative to end of file */
33 #define SEEK_MAX SEEK_END
35 /* And dynamically-tunable limits and defaults: */
36 struct files_stat_struct {
37 int nr_files; /* read only */
38 int nr_free_files; /* read only */
39 int max_files; /* tunable */
41 extern struct files_stat_struct files_stat;
42 extern int get_max_files(void);
44 struct inodes_stat_t {
47 int dummy[5]; /* padding for sysctl ABI compatibility */
49 extern struct inodes_stat_t inodes_stat;
51 extern int leases_enable, lease_break_time;
54 extern int dir_notify_enable;
57 #define NR_FILE 8192 /* this can well be larger on a larger system */
67 /* Internal kernel extensions */
70 #define FMODE_PWRITE FMODE_PREAD /* These go hand in hand */
72 /* File is being opened for execution. Primary users of this flag are
73 distributed filesystems that can use it to achieve correct ETXTBUSY
74 behavior for cross-node execution/opening_for_writing of files */
81 #define READA 2 /* read-ahead - don't block if no resources */
82 #define SWRITE 3 /* for ll_rw_block() - wait for buffer lock */
83 #define READ_SYNC (READ | (1 << BIO_RW_SYNC))
84 #define READ_META (READ | (1 << BIO_RW_META))
85 #define WRITE_SYNC (WRITE | (1 << BIO_RW_SYNC))
86 #define WRITE_BARRIER ((1 << BIO_RW) | (1 << BIO_RW_BARRIER))
92 /* public flags for file_system_type */
93 #define FS_REQUIRES_DEV 1
94 #define FS_BINARY_MOUNTDATA 2
95 #define FS_HAS_SUBTYPE 4
96 #define FS_REVAL_DOT 16384 /* Check the paths ".", ".." for staleness */
97 #define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move()
98 * during rename() internally.
102 * These are the fs-independent mount-flags: up to 32 flags are supported
104 #define MS_RDONLY 1 /* Mount read-only */
105 #define MS_NOSUID 2 /* Ignore suid and sgid bits */
106 #define MS_NODEV 4 /* Disallow access to device special files */
107 #define MS_NOEXEC 8 /* Disallow program execution */
108 #define MS_SYNCHRONOUS 16 /* Writes are synced at once */
109 #define MS_REMOUNT 32 /* Alter flags of a mounted FS */
110 #define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */
111 #define MS_DIRSYNC 128 /* Directory modifications are synchronous */
112 #define MS_NOATIME 1024 /* Do not update access times. */
113 #define MS_NODIRATIME 2048 /* Do not update directory access times */
117 #define MS_VERBOSE 32768 /* War is peace. Verbosity is silence.
118 MS_VERBOSE is deprecated. */
119 #define MS_SILENT 32768
120 #define MS_POSIXACL (1<<16) /* VFS does not apply the umask */
121 #define MS_UNBINDABLE (1<<17) /* change to unbindable */
122 #define MS_PRIVATE (1<<18) /* change to private */
123 #define MS_SLAVE (1<<19) /* change to slave */
124 #define MS_SHARED (1<<20) /* change to shared */
125 #define MS_RELATIME (1<<21) /* Update atime relative to mtime/ctime. */
126 #define MS_ACTIVE (1<<30)
127 #define MS_NOUSER (1<<31)
130 * Superblock flags that can be altered by MS_REMOUNT
132 #define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK)
135 * Old magic mount flag and mask
137 #define MS_MGC_VAL 0xC0ED0000
138 #define MS_MGC_MSK 0xffff0000
140 /* Inode flags - they have nothing to superblock flags now */
142 #define S_SYNC 1 /* Writes are synced at once */
143 #define S_NOATIME 2 /* Do not update access times */
144 #define S_APPEND 4 /* Append-only file */
145 #define S_IMMUTABLE 8 /* Immutable file */
146 #define S_DEAD 16 /* removed, but still open directory */
147 #define S_NOQUOTA 32 /* Inode is not counted to quota */
148 #define S_DIRSYNC 64 /* Directory modifications are synchronous */
149 #define S_NOCMTIME 128 /* Do not update file c/mtime */
150 #define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */
151 #define S_PRIVATE 512 /* Inode is fs-internal */
154 * Note that nosuid etc flags are inode-specific: setting some file-system
155 * flags just means all the inodes inherit those flags by default. It might be
156 * possible to override it selectively if you really wanted to with some
157 * ioctl() that is not currently implemented.
159 * Exception: MS_RDONLY is always applied to the entire file system.
161 * Unfortunately, it is possible to change a filesystems flags with it mounted
162 * with files in use. This means that all of the inodes will not have their
163 * i_flags updated. Hence, i_flags no longer inherit the superblock mount
164 * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
166 #define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg))
168 #define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY)
169 #define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \
170 ((inode)->i_flags & S_SYNC))
171 #define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \
172 ((inode)->i_flags & (S_SYNC|S_DIRSYNC)))
173 #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK)
174 #define IS_NOATIME(inode) __IS_FLG(inode, MS_RDONLY|MS_NOATIME)
176 #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA)
177 #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
178 #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE)
179 #define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL)
181 #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD)
182 #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME)
183 #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE)
184 #define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE)
186 /* the read-only stuff doesn't really belong here, but any other place is
187 probably as bad and I don't want to create yet another include file. */
189 #define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */
190 #define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */
191 #define BLKRRPART _IO(0x12,95) /* re-read partition table */
192 #define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */
193 #define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */
194 #define BLKRASET _IO(0x12,98) /* set read ahead for block device */
195 #define BLKRAGET _IO(0x12,99) /* get current read ahead setting */
196 #define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */
197 #define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */
198 #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */
199 #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */
200 #define BLKSSZGET _IO(0x12,104)/* get block device sector size */
202 #define BLKPG _IO(0x12,105)/* See blkpg.h */
204 /* Some people are morons. Do not use sizeof! */
206 #define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */
207 #define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */
208 /* This was here just to show that the number is taken -
209 probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */
211 /* A jump here: 108-111 have been used for various private purposes. */
212 #define BLKBSZGET _IOR(0x12,112,size_t)
213 #define BLKBSZSET _IOW(0x12,113,size_t)
214 #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
215 #define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup)
216 #define BLKTRACESTART _IO(0x12,116)
217 #define BLKTRACESTOP _IO(0x12,117)
218 #define BLKTRACETEARDOWN _IO(0x12,118)
220 #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
221 #define FIBMAP _IO(0x00,1) /* bmap access */
222 #define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */
224 #define FS_IOC_GETFLAGS _IOR('f', 1, long)
225 #define FS_IOC_SETFLAGS _IOW('f', 2, long)
226 #define FS_IOC_GETVERSION _IOR('v', 1, long)
227 #define FS_IOC_SETVERSION _IOW('v', 2, long)
228 #define FS_IOC32_GETFLAGS _IOR('f', 1, int)
229 #define FS_IOC32_SETFLAGS _IOW('f', 2, int)
230 #define FS_IOC32_GETVERSION _IOR('v', 1, int)
231 #define FS_IOC32_SETVERSION _IOW('v', 2, int)
234 * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS)
236 #define FS_SECRM_FL 0x00000001 /* Secure deletion */
237 #define FS_UNRM_FL 0x00000002 /* Undelete */
238 #define FS_COMPR_FL 0x00000004 /* Compress file */
239 #define FS_SYNC_FL 0x00000008 /* Synchronous updates */
240 #define FS_IMMUTABLE_FL 0x00000010 /* Immutable file */
241 #define FS_APPEND_FL 0x00000020 /* writes to file may only append */
242 #define FS_NODUMP_FL 0x00000040 /* do not dump file */
243 #define FS_NOATIME_FL 0x00000080 /* do not update atime */
244 /* Reserved for compression usage... */
245 #define FS_DIRTY_FL 0x00000100
246 #define FS_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
247 #define FS_NOCOMP_FL 0x00000400 /* Don't compress */
248 #define FS_ECOMPR_FL 0x00000800 /* Compression error */
249 /* End compression flags --- maybe not all used */
250 #define FS_BTREE_FL 0x00001000 /* btree format dir */
251 #define FS_INDEX_FL 0x00001000 /* hash-indexed directory */
252 #define FS_IMAGIC_FL 0x00002000 /* AFS directory */
253 #define FS_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */
254 #define FS_NOTAIL_FL 0x00008000 /* file tail should not be merged */
255 #define FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
256 #define FS_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
257 #define FS_EXTENT_FL 0x00080000 /* Extents */
258 #define FS_DIRECTIO_FL 0x00100000 /* Use direct i/o */
259 #define FS_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
261 #define FS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */
262 #define FS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
265 #define SYNC_FILE_RANGE_WAIT_BEFORE 1
266 #define SYNC_FILE_RANGE_WRITE 2
267 #define SYNC_FILE_RANGE_WAIT_AFTER 4
271 #include <linux/linkage.h>
272 #include <linux/wait.h>
273 #include <linux/types.h>
274 #include <linux/kdev_t.h>
275 #include <linux/dcache.h>
276 #include <linux/namei.h>
277 #include <linux/stat.h>
278 #include <linux/cache.h>
279 #include <linux/kobject.h>
280 #include <linux/list.h>
281 #include <linux/radix-tree.h>
282 #include <linux/prio_tree.h>
283 #include <linux/init.h>
284 #include <linux/pid.h>
285 #include <linux/mutex.h>
286 #include <linux/sysctl.h>
287 #include <linux/capability.h>
289 #include <asm/atomic.h>
290 #include <asm/semaphore.h>
291 #include <asm/byteorder.h>
293 struct export_operations;
298 struct pipe_inode_info;
299 struct poll_table_struct;
301 struct vm_area_struct;
304 extern void __init inode_init(unsigned long);
305 extern void __init inode_init_early(void);
306 extern void __init mnt_init(unsigned long);
307 extern void __init files_init(unsigned long);
310 typedef int (get_block_t)(struct inode *inode, sector_t iblock,
311 struct buffer_head *bh_result, int create);
312 typedef void (dio_iodone_t)(struct kiocb *iocb, loff_t offset,
313 ssize_t bytes, void *private);
316 * Attribute flags. These should be or-ed together to figure out what
323 #define ATTR_ATIME 16
324 #define ATTR_MTIME 32
325 #define ATTR_CTIME 64
326 #define ATTR_ATIME_SET 128
327 #define ATTR_MTIME_SET 256
328 #define ATTR_FORCE 512 /* Not a change, but a change it */
329 #define ATTR_ATTR_FLAG 1024
330 #define ATTR_KILL_SUID 2048
331 #define ATTR_KILL_SGID 4096
332 #define ATTR_FILE 8192
335 * This is the Inode Attributes structure, used for notify_change(). It
336 * uses the above definitions as flags, to know which values have changed.
337 * Also, in this manner, a Filesystem can look at only the values it cares
338 * about. Basically, these are the attributes that the VFS layer can
339 * request to change from the FS layer.
341 * Derek Atkins <warlord@MIT.EDU> 94-10-20
344 unsigned int ia_valid;
349 struct timespec ia_atime;
350 struct timespec ia_mtime;
351 struct timespec ia_ctime;
354 * Not an attribute, but an auxilary info for filesystems wanting to
355 * implement an ftruncate() like method. NOTE: filesystem should
356 * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL).
358 struct file *ia_file;
362 * Includes for diskquotas.
364 #include <linux/quota.h>
367 * enum positive_aop_returns - aop return codes with specific semantics
369 * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has
370 * completed, that the page is still locked, and
371 * should be considered active. The VM uses this hint
372 * to return the page to the active list -- it won't
373 * be a candidate for writeback again in the near
374 * future. Other callers must be careful to unlock
375 * the page if they get this return. Returned by
378 * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has
379 * unlocked it and the page might have been truncated.
380 * The caller should back up to acquiring a new page and
381 * trying again. The aop will be taking reasonable
382 * precautions not to livelock. If the caller held a page
383 * reference, it should drop it before retrying. Returned
384 * by readpage(), prepare_write(), and commit_write().
386 * address_space_operation functions return these large constants to indicate
387 * special semantics to the caller. These are much larger than the bytes in a
388 * page to allow for functions that return the number of bytes operated on in a
392 enum positive_aop_returns {
393 AOP_WRITEPAGE_ACTIVATE = 0x80000,
394 AOP_TRUNCATED_PAGE = 0x80001,
398 * oh the beauties of C type declarations.
401 struct address_space;
402 struct writeback_control;
405 const struct iovec *iov;
406 unsigned long nr_segs;
411 size_t iov_iter_copy_from_user_atomic(struct page *page,
412 struct iov_iter *i, unsigned long offset, size_t bytes);
413 size_t iov_iter_copy_from_user(struct page *page,
414 struct iov_iter *i, unsigned long offset, size_t bytes);
415 void iov_iter_advance(struct iov_iter *i, size_t bytes);
416 int iov_iter_fault_in_readable(struct iov_iter *i);
417 size_t iov_iter_single_seg_count(struct iov_iter *i);
419 static inline void iov_iter_init(struct iov_iter *i,
420 const struct iovec *iov, unsigned long nr_segs,
421 size_t count, size_t written)
424 i->nr_segs = nr_segs;
426 i->count = count + written;
428 iov_iter_advance(i, written);
431 static inline size_t iov_iter_count(struct iov_iter *i)
437 struct address_space_operations {
438 int (*writepage)(struct page *page, struct writeback_control *wbc);
439 int (*readpage)(struct file *, struct page *);
440 void (*sync_page)(struct page *);
442 /* Write back some dirty pages from this mapping. */
443 int (*writepages)(struct address_space *, struct writeback_control *);
445 /* Set a page dirty. Return true if this dirtied it */
446 int (*set_page_dirty)(struct page *page);
448 int (*readpages)(struct file *filp, struct address_space *mapping,
449 struct list_head *pages, unsigned nr_pages);
452 * ext3 requires that a successful prepare_write() call be followed
453 * by a commit_write() call - they must be balanced
455 int (*prepare_write)(struct file *, struct page *, unsigned, unsigned);
456 int (*commit_write)(struct file *, struct page *, unsigned, unsigned);
457 /* Unfortunately this kludge is needed for FIBMAP. Don't use it */
458 sector_t (*bmap)(struct address_space *, sector_t);
459 void (*invalidatepage) (struct page *, unsigned long);
460 int (*releasepage) (struct page *, gfp_t);
461 ssize_t (*direct_IO)(int, struct kiocb *, const struct iovec *iov,
462 loff_t offset, unsigned long nr_segs);
463 struct page* (*get_xip_page)(struct address_space *, sector_t,
465 /* migrate the contents of a page to the specified target */
466 int (*migratepage) (struct address_space *,
467 struct page *, struct page *);
468 int (*launder_page) (struct page *);
471 struct backing_dev_info;
472 struct address_space {
473 struct inode *host; /* owner: inode, block_device */
474 struct radix_tree_root page_tree; /* radix tree of all pages */
475 rwlock_t tree_lock; /* and rwlock protecting it */
476 unsigned int i_mmap_writable;/* count VM_SHARED mappings */
477 struct prio_tree_root i_mmap; /* tree of private and shared mappings */
478 struct list_head i_mmap_nonlinear;/*list VM_NONLINEAR mappings */
479 spinlock_t i_mmap_lock; /* protect tree, count, list */
480 unsigned int truncate_count; /* Cover race condition with truncate */
481 unsigned long nrpages; /* number of total pages */
482 pgoff_t writeback_index;/* writeback starts here */
483 const struct address_space_operations *a_ops; /* methods */
484 unsigned long flags; /* error bits/gfp mask */
485 struct backing_dev_info *backing_dev_info; /* device readahead, etc */
486 spinlock_t private_lock; /* for use by the address_space */
487 struct list_head private_list; /* ditto */
488 struct address_space *assoc_mapping; /* ditto */
489 } __attribute__((aligned(sizeof(long))));
491 * On most architectures that alignment is already the case; but
492 * must be enforced here for CRIS, to let the least signficant bit
493 * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON.
496 struct block_device {
497 dev_t bd_dev; /* not a kdev_t - it's a search key */
498 struct inode * bd_inode; /* will die */
500 struct mutex bd_mutex; /* open/close mutex */
501 struct semaphore bd_mount_sem;
502 struct list_head bd_inodes;
506 struct list_head bd_holder_list;
508 struct block_device * bd_contains;
509 unsigned bd_block_size;
510 struct hd_struct * bd_part;
511 /* number of times partitions within this device have been opened. */
512 unsigned bd_part_count;
514 struct gendisk * bd_disk;
515 struct list_head bd_list;
516 struct backing_dev_info *bd_inode_backing_dev_info;
518 * Private data. You must have bd_claim'ed the block_device
519 * to use this. NOTE: bd_claim allows an owner to claim
520 * the same device multiple times, the owner must take special
521 * care to not mess up bd_private for that case.
523 unsigned long bd_private;
527 * Radix-tree tags, for tagging dirty and writeback pages within the pagecache
530 #define PAGECACHE_TAG_DIRTY 0
531 #define PAGECACHE_TAG_WRITEBACK 1
533 int mapping_tagged(struct address_space *mapping, int tag);
536 * Might pages of this file be mapped into userspace?
538 static inline int mapping_mapped(struct address_space *mapping)
540 return !prio_tree_empty(&mapping->i_mmap) ||
541 !list_empty(&mapping->i_mmap_nonlinear);
545 * Might pages of this file have been modified in userspace?
546 * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff
547 * marks vma as VM_SHARED if it is shared, and the file was opened for
548 * writing i.e. vma may be mprotected writable even if now readonly.
550 static inline int mapping_writably_mapped(struct address_space *mapping)
552 return mapping->i_mmap_writable != 0;
556 * Use sequence counter to get consistent i_size on 32-bit processors.
558 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
559 #include <linux/seqlock.h>
560 #define __NEED_I_SIZE_ORDERED
561 #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount)
563 #define i_size_ordered_init(inode) do { } while (0)
567 struct hlist_node i_hash;
568 struct list_head i_list;
569 struct list_head i_sb_list;
570 struct list_head i_dentry;
573 unsigned int i_nlink;
577 unsigned long i_version;
579 #ifdef __NEED_I_SIZE_ORDERED
580 seqcount_t i_size_seqcount;
582 struct timespec i_atime;
583 struct timespec i_mtime;
584 struct timespec i_ctime;
585 unsigned int i_blkbits;
587 unsigned short i_bytes;
589 spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */
590 struct mutex i_mutex;
591 struct rw_semaphore i_alloc_sem;
592 const struct inode_operations *i_op;
593 const struct file_operations *i_fop; /* former ->i_op->default_file_ops */
594 struct super_block *i_sb;
595 struct file_lock *i_flock;
596 struct address_space *i_mapping;
597 struct address_space i_data;
599 struct dquot *i_dquot[MAXQUOTAS];
601 struct list_head i_devices;
603 struct pipe_inode_info *i_pipe;
604 struct block_device *i_bdev;
611 #ifdef CONFIG_DNOTIFY
612 unsigned long i_dnotify_mask; /* Directory notify events */
613 struct dnotify_struct *i_dnotify; /* for directory notifications */
616 #ifdef CONFIG_INOTIFY
617 struct list_head inotify_watches; /* watches on this inode */
618 struct mutex inotify_mutex; /* protects the watches list */
621 unsigned long i_state;
622 unsigned long dirtied_when; /* jiffies of first dirtying */
624 unsigned int i_flags;
626 atomic_t i_writecount;
627 #ifdef CONFIG_SECURITY
630 void *i_private; /* fs or device private pointer */
634 * inode->i_mutex nesting subclasses for the lock validator:
636 * 0: the object of the current VFS operation
641 * The locking order between these classes is
642 * parent -> child -> normal -> xattr -> quota
644 enum inode_i_mutex_lock_class
653 extern void inode_double_lock(struct inode *inode1, struct inode *inode2);
654 extern void inode_double_unlock(struct inode *inode1, struct inode *inode2);
657 * NOTE: in a 32bit arch with a preemptable kernel and
658 * an UP compile the i_size_read/write must be atomic
659 * with respect to the local cpu (unlike with preempt disabled),
660 * but they don't need to be atomic with respect to other cpus like in
661 * true SMP (so they need either to either locally disable irq around
662 * the read or for example on x86 they can be still implemented as a
663 * cmpxchg8b without the need of the lock prefix). For SMP compiles
664 * and 64bit archs it makes no difference if preempt is enabled or not.
666 static inline loff_t i_size_read(const struct inode *inode)
668 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
673 seq = read_seqcount_begin(&inode->i_size_seqcount);
674 i_size = inode->i_size;
675 } while (read_seqcount_retry(&inode->i_size_seqcount, seq));
677 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
681 i_size = inode->i_size;
685 return inode->i_size;
690 * NOTE: unlike i_size_read(), i_size_write() does need locking around it
691 * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount
692 * can be lost, resulting in subsequent i_size_read() calls spinning forever.
694 static inline void i_size_write(struct inode *inode, loff_t i_size)
696 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
697 write_seqcount_begin(&inode->i_size_seqcount);
698 inode->i_size = i_size;
699 write_seqcount_end(&inode->i_size_seqcount);
700 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
702 inode->i_size = i_size;
705 inode->i_size = i_size;
709 static inline unsigned iminor(const struct inode *inode)
711 return MINOR(inode->i_rdev);
714 static inline unsigned imajor(const struct inode *inode)
716 return MAJOR(inode->i_rdev);
719 extern struct block_device *I_BDEV(struct inode *inode);
722 rwlock_t lock; /* protects pid, uid, euid fields */
723 struct pid *pid; /* pid or -pgrp where SIGIO should be sent */
724 enum pid_type pid_type; /* Kind of process group SIGIO should be sent to */
725 uid_t uid, euid; /* uid/euid of process setting the owner */
726 int signum; /* posix.1b rt signal to be delivered on IO */
730 * Track a single file's readahead state
732 struct file_ra_state {
733 pgoff_t start; /* where readahead started */
734 unsigned int size; /* # of readahead pages */
735 unsigned int async_size; /* do asynchronous readahead when
736 there are only # of pages ahead */
738 unsigned int ra_pages; /* Maximum readahead window */
739 int mmap_miss; /* Cache miss stat for mmap accesses */
740 loff_t prev_pos; /* Cache last read() position */
744 * Check if @index falls in the readahead windows.
746 static inline int ra_has_index(struct file_ra_state *ra, pgoff_t index)
748 return (index >= ra->start &&
749 index < ra->start + ra->size);
754 * fu_list becomes invalid after file_free is called and queued via
755 * fu_rcuhead for RCU freeing
758 struct list_head fu_list;
759 struct rcu_head fu_rcuhead;
762 #define f_dentry f_path.dentry
763 #define f_vfsmnt f_path.mnt
764 const struct file_operations *f_op;
766 unsigned int f_flags;
769 struct fown_struct f_owner;
770 unsigned int f_uid, f_gid;
771 struct file_ra_state f_ra;
773 unsigned long f_version;
774 #ifdef CONFIG_SECURITY
777 /* needed for tty driver, and maybe others */
781 /* Used by fs/eventpoll.c to link all the hooks to this file */
782 struct list_head f_ep_links;
783 spinlock_t f_ep_lock;
784 #endif /* #ifdef CONFIG_EPOLL */
785 struct address_space *f_mapping;
787 extern spinlock_t files_lock;
788 #define file_list_lock() spin_lock(&files_lock);
789 #define file_list_unlock() spin_unlock(&files_lock);
791 #define get_file(x) atomic_inc(&(x)->f_count)
792 #define file_count(x) atomic_read(&(x)->f_count)
794 #define MAX_NON_LFS ((1UL<<31) - 1)
796 /* Page cache limit. The filesystems should put that into their s_maxbytes
797 limits, otherwise bad things can happen in VM. */
798 #if BITS_PER_LONG==32
799 #define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
800 #elif BITS_PER_LONG==64
801 #define MAX_LFS_FILESIZE 0x7fffffffffffffffUL
806 #define FL_ACCESS 8 /* not trying to lock, just looking */
807 #define FL_EXISTS 16 /* when unlocking, test for existence */
808 #define FL_LEASE 32 /* lease held on this file */
809 #define FL_CLOSE 64 /* unlock on close */
810 #define FL_SLEEP 128 /* A blocking lock */
813 * The POSIX file lock owner is determined by
814 * the "struct files_struct" in the thread group
815 * (or NULL for no owner - BSD locks).
817 * Lockd stuffs a "host" pointer into this.
819 typedef struct files_struct *fl_owner_t;
821 struct file_lock_operations {
822 void (*fl_insert)(struct file_lock *); /* lock insertion callback */
823 void (*fl_remove)(struct file_lock *); /* lock removal callback */
824 void (*fl_copy_lock)(struct file_lock *, struct file_lock *);
825 void (*fl_release_private)(struct file_lock *);
828 struct lock_manager_operations {
829 int (*fl_compare_owner)(struct file_lock *, struct file_lock *);
830 void (*fl_notify)(struct file_lock *); /* unblock callback */
831 int (*fl_grant)(struct file_lock *, struct file_lock *, int);
832 void (*fl_copy_lock)(struct file_lock *, struct file_lock *);
833 void (*fl_release_private)(struct file_lock *);
834 void (*fl_break)(struct file_lock *);
835 int (*fl_mylease)(struct file_lock *, struct file_lock *);
836 int (*fl_change)(struct file_lock **, int);
839 /* that will die - we need it for nfs_lock_info */
840 #include <linux/nfs_fs_i.h>
843 struct file_lock *fl_next; /* singly linked list for this inode */
844 struct list_head fl_link; /* doubly linked list of all locks */
845 struct list_head fl_block; /* circular list of blocked processes */
848 wait_queue_head_t fl_wait;
849 struct file *fl_file;
850 unsigned char fl_flags;
851 unsigned char fl_type;
855 struct fasync_struct * fl_fasync; /* for lease break notifications */
856 unsigned long fl_break_time; /* for nonblocking lease breaks */
858 struct file_lock_operations *fl_ops; /* Callbacks for filesystems */
859 struct lock_manager_operations *fl_lmops; /* Callbacks for lockmanagers */
861 struct nfs_lock_info nfs_fl;
862 struct nfs4_lock_info nfs4_fl;
864 struct list_head link; /* link in AFS vnode's pending_locks list */
865 int state; /* state of grant or error if -ve */
870 /* The following constant reflects the upper bound of the file/locking space */
872 #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1)))
873 #define OFFSET_MAX INT_LIMIT(loff_t)
874 #define OFFT_OFFSET_MAX INT_LIMIT(off_t)
877 #include <linux/fcntl.h>
879 extern int fcntl_getlk(struct file *, struct flock __user *);
880 extern int fcntl_setlk(unsigned int, struct file *, unsigned int,
881 struct flock __user *);
883 #if BITS_PER_LONG == 32
884 extern int fcntl_getlk64(struct file *, struct flock64 __user *);
885 extern int fcntl_setlk64(unsigned int, struct file *, unsigned int,
886 struct flock64 __user *);
889 extern void send_sigio(struct fown_struct *fown, int fd, int band);
890 extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg);
891 extern int fcntl_getlease(struct file *filp);
894 extern int do_sync_mapping_range(struct address_space *mapping, loff_t offset,
895 loff_t endbyte, unsigned int flags);
898 extern void locks_init_lock(struct file_lock *);
899 extern void locks_copy_lock(struct file_lock *, struct file_lock *);
900 extern void locks_remove_posix(struct file *, fl_owner_t);
901 extern void locks_remove_flock(struct file *);
902 extern void posix_test_lock(struct file *, struct file_lock *);
903 extern int posix_lock_file(struct file *, struct file_lock *, struct file_lock *);
904 extern int posix_lock_file_wait(struct file *, struct file_lock *);
905 extern int posix_unblock_lock(struct file *, struct file_lock *);
906 extern int vfs_test_lock(struct file *, struct file_lock *);
907 extern int vfs_lock_file(struct file *, unsigned int, struct file_lock *, struct file_lock *);
908 extern int vfs_cancel_lock(struct file *filp, struct file_lock *fl);
909 extern int flock_lock_file_wait(struct file *filp, struct file_lock *fl);
910 extern int __break_lease(struct inode *inode, unsigned int flags);
911 extern void lease_get_mtime(struct inode *, struct timespec *time);
912 extern int generic_setlease(struct file *, long, struct file_lock **);
913 extern int vfs_setlease(struct file *, long, struct file_lock **);
914 extern int lease_modify(struct file_lock **, int);
915 extern int lock_may_read(struct inode *, loff_t start, unsigned long count);
916 extern int lock_may_write(struct inode *, loff_t start, unsigned long count);
917 extern struct seq_operations locks_seq_operations;
919 struct fasync_struct {
922 struct fasync_struct *fa_next; /* singly linked list */
923 struct file *fa_file;
926 #define FASYNC_MAGIC 0x4601
928 /* SMP safe fasync helpers: */
929 extern int fasync_helper(int, struct file *, int, struct fasync_struct **);
930 /* can be called from interrupts */
931 extern void kill_fasync(struct fasync_struct **, int, int);
932 /* only for net: no internal synchronization */
933 extern void __kill_fasync(struct fasync_struct *, int, int);
935 extern int __f_setown(struct file *filp, struct pid *, enum pid_type, int force);
936 extern int f_setown(struct file *filp, unsigned long arg, int force);
937 extern void f_delown(struct file *filp);
938 extern pid_t f_getown(struct file *filp);
939 extern int send_sigurg(struct fown_struct *fown);
945 #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */
946 #define MNT_DETACH 0x00000002 /* Just detach from the tree */
947 #define MNT_EXPIRE 0x00000004 /* Mark for expiry */
949 extern struct list_head super_blocks;
950 extern spinlock_t sb_lock;
952 #define sb_entry(list) list_entry((list), struct super_block, s_list)
953 #define S_BIAS (1<<30)
955 struct list_head s_list; /* Keep this first */
956 dev_t s_dev; /* search index; _not_ kdev_t */
957 unsigned long s_blocksize;
958 unsigned char s_blocksize_bits;
959 unsigned char s_dirt;
960 unsigned long long s_maxbytes; /* Max file size */
961 struct file_system_type *s_type;
962 const struct super_operations *s_op;
963 struct dquot_operations *dq_op;
964 struct quotactl_ops *s_qcop;
965 struct export_operations *s_export_op;
966 unsigned long s_flags;
967 unsigned long s_magic;
968 struct dentry *s_root;
969 struct rw_semaphore s_umount;
975 #ifdef CONFIG_SECURITY
978 struct xattr_handler **s_xattr;
980 struct list_head s_inodes; /* all inodes */
981 struct list_head s_dirty; /* dirty inodes */
982 struct list_head s_io; /* parked for writeback */
983 struct hlist_head s_anon; /* anonymous dentries for (nfs) exporting */
984 struct list_head s_files;
986 struct block_device *s_bdev;
987 struct mtd_info *s_mtd;
988 struct list_head s_instances;
989 struct quota_info s_dquot; /* Diskquota specific options */
992 wait_queue_head_t s_wait_unfrozen;
994 char s_id[32]; /* Informational name */
996 void *s_fs_info; /* Filesystem private info */
999 * The next field is for VFS *only*. No filesystems have any business
1000 * even looking at it. You had been warned.
1002 struct mutex s_vfs_rename_mutex; /* Kludge */
1004 /* Granularity of c/m/atime in ns.
1005 Cannot be worse than a second */
1009 * Filesystem subtype. If non-empty the filesystem type field
1010 * in /proc/mounts will be "type.subtype"
1015 extern struct timespec current_fs_time(struct super_block *sb);
1018 * Snapshotting support.
1022 SB_FREEZE_WRITE = 1,
1023 SB_FREEZE_TRANS = 2,
1026 #define vfs_check_frozen(sb, level) \
1027 wait_event((sb)->s_wait_unfrozen, ((sb)->s_frozen < (level)))
1029 #define get_fs_excl() atomic_inc(¤t->fs_excl)
1030 #define put_fs_excl() atomic_dec(¤t->fs_excl)
1031 #define has_fs_excl() atomic_read(¤t->fs_excl)
1033 #define is_owner_or_cap(inode) \
1034 ((current->fsuid == (inode)->i_uid) || capable(CAP_FOWNER))
1036 /* not quite ready to be deprecated, but... */
1037 extern void lock_super(struct super_block *);
1038 extern void unlock_super(struct super_block *);
1041 * VFS helper functions..
1043 extern int vfs_permission(struct nameidata *, int);
1044 extern int vfs_create(struct inode *, struct dentry *, int, struct nameidata *);
1045 extern int vfs_mkdir(struct inode *, struct dentry *, int);
1046 extern int vfs_mknod(struct inode *, struct dentry *, int, dev_t);
1047 extern int vfs_symlink(struct inode *, struct dentry *, const char *, int);
1048 extern int vfs_link(struct dentry *, struct inode *, struct dentry *);
1049 extern int vfs_rmdir(struct inode *, struct dentry *);
1050 extern int vfs_unlink(struct inode *, struct dentry *);
1051 extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
1054 * VFS dentry helper functions.
1056 extern void dentry_unhash(struct dentry *dentry);
1059 * VFS file helper functions.
1061 extern int file_permission(struct file *, int);
1066 * NOTE! These match bits 12..15 of stat.st_mode
1067 * (ie "(i_mode >> 12) & 15").
1069 #define DT_UNKNOWN 0
1079 #define OSYNC_METADATA (1<<0)
1080 #define OSYNC_DATA (1<<1)
1081 #define OSYNC_INODE (1<<2)
1082 int generic_osync_inode(struct inode *, struct address_space *, int);
1085 * This is the "filldir" function type, used by readdir() to let
1086 * the kernel specify what kind of dirent layout it wants to have.
1087 * This allows the kernel to read directories into kernel space or
1088 * to have different dirent layouts depending on the binary type.
1090 typedef int (*filldir_t)(void *, const char *, int, loff_t, u64, unsigned);
1092 struct block_device_operations {
1093 int (*open) (struct inode *, struct file *);
1094 int (*release) (struct inode *, struct file *);
1095 int (*ioctl) (struct inode *, struct file *, unsigned, unsigned long);
1096 long (*unlocked_ioctl) (struct file *, unsigned, unsigned long);
1097 long (*compat_ioctl) (struct file *, unsigned, unsigned long);
1098 int (*direct_access) (struct block_device *, sector_t, unsigned long *);
1099 int (*media_changed) (struct gendisk *);
1100 int (*revalidate_disk) (struct gendisk *);
1101 int (*getgeo)(struct block_device *, struct hd_geometry *);
1102 struct module *owner;
1106 * "descriptor" for what we're up to with a read.
1107 * This allows us to use the same read code yet
1108 * have multiple different users of the data that
1109 * we read from a file.
1111 * The simplest case just copies the data to user
1122 } read_descriptor_t;
1124 typedef int (*read_actor_t)(read_descriptor_t *, struct page *, unsigned long, unsigned long);
1126 /* These macros are for out of kernel modules to test that
1127 * the kernel supports the unlocked_ioctl and compat_ioctl
1128 * fields in struct file_operations. */
1129 #define HAVE_COMPAT_IOCTL 1
1130 #define HAVE_UNLOCKED_IOCTL 1
1134 * read, write, poll, fsync, readv, writev, unlocked_ioctl and compat_ioctl
1135 * can be called without the big kernel lock held in all filesystems.
1137 struct file_operations {
1138 struct module *owner;
1139 loff_t (*llseek) (struct file *, loff_t, int);
1140 ssize_t (*read) (struct file *, char __user *, size_t, loff_t *);
1141 ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *);
1142 ssize_t (*aio_read) (struct kiocb *, const struct iovec *, unsigned long, loff_t);
1143 ssize_t (*aio_write) (struct kiocb *, const struct iovec *, unsigned long, loff_t);
1144 int (*readdir) (struct file *, void *, filldir_t);
1145 unsigned int (*poll) (struct file *, struct poll_table_struct *);
1146 int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long);
1147 long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);
1148 long (*compat_ioctl) (struct file *, unsigned int, unsigned long);
1149 int (*mmap) (struct file *, struct vm_area_struct *);
1150 int (*open) (struct inode *, struct file *);
1151 int (*flush) (struct file *, fl_owner_t id);
1152 int (*release) (struct inode *, struct file *);
1153 int (*fsync) (struct file *, struct dentry *, int datasync);
1154 int (*aio_fsync) (struct kiocb *, int datasync);
1155 int (*fasync) (int, struct file *, int);
1156 int (*lock) (struct file *, int, struct file_lock *);
1157 ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int);
1158 unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
1159 int (*check_flags)(int);
1160 int (*dir_notify)(struct file *filp, unsigned long arg);
1161 int (*flock) (struct file *, int, struct file_lock *);
1162 ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int);
1163 ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int);
1164 int (*setlease)(struct file *, long, struct file_lock **);
1167 struct inode_operations {
1168 int (*create) (struct inode *,struct dentry *,int, struct nameidata *);
1169 struct dentry * (*lookup) (struct inode *,struct dentry *, struct nameidata *);
1170 int (*link) (struct dentry *,struct inode *,struct dentry *);
1171 int (*unlink) (struct inode *,struct dentry *);
1172 int (*symlink) (struct inode *,struct dentry *,const char *);
1173 int (*mkdir) (struct inode *,struct dentry *,int);
1174 int (*rmdir) (struct inode *,struct dentry *);
1175 int (*mknod) (struct inode *,struct dentry *,int,dev_t);
1176 int (*rename) (struct inode *, struct dentry *,
1177 struct inode *, struct dentry *);
1178 int (*readlink) (struct dentry *, char __user *,int);
1179 void * (*follow_link) (struct dentry *, struct nameidata *);
1180 void (*put_link) (struct dentry *, struct nameidata *, void *);
1181 void (*truncate) (struct inode *);
1182 int (*permission) (struct inode *, int, struct nameidata *);
1183 int (*setattr) (struct dentry *, struct iattr *);
1184 int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *);
1185 int (*setxattr) (struct dentry *, const char *,const void *,size_t,int);
1186 ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t);
1187 ssize_t (*listxattr) (struct dentry *, char *, size_t);
1188 int (*removexattr) (struct dentry *, const char *);
1189 void (*truncate_range)(struct inode *, loff_t, loff_t);
1190 long (*fallocate)(struct inode *inode, int mode, loff_t offset,
1196 ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector,
1197 unsigned long nr_segs, unsigned long fast_segs,
1198 struct iovec *fast_pointer,
1199 struct iovec **ret_pointer);
1201 extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *);
1202 extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *);
1203 extern ssize_t vfs_readv(struct file *, const struct iovec __user *,
1204 unsigned long, loff_t *);
1205 extern ssize_t vfs_writev(struct file *, const struct iovec __user *,
1206 unsigned long, loff_t *);
1209 * NOTE: write_inode, delete_inode, clear_inode, put_inode can be called
1210 * without the big kernel lock held in all filesystems.
1212 struct super_operations {
1213 struct inode *(*alloc_inode)(struct super_block *sb);
1214 void (*destroy_inode)(struct inode *);
1216 void (*read_inode) (struct inode *);
1218 void (*dirty_inode) (struct inode *);
1219 int (*write_inode) (struct inode *, int);
1220 void (*put_inode) (struct inode *);
1221 void (*drop_inode) (struct inode *);
1222 void (*delete_inode) (struct inode *);
1223 void (*put_super) (struct super_block *);
1224 void (*write_super) (struct super_block *);
1225 int (*sync_fs)(struct super_block *sb, int wait);
1226 void (*write_super_lockfs) (struct super_block *);
1227 void (*unlockfs) (struct super_block *);
1228 int (*statfs) (struct dentry *, struct kstatfs *);
1229 int (*remount_fs) (struct super_block *, int *, char *);
1230 void (*clear_inode) (struct inode *);
1231 void (*umount_begin) (struct vfsmount *, int);
1233 int (*show_options)(struct seq_file *, struct vfsmount *);
1234 int (*show_stats)(struct seq_file *, struct vfsmount *);
1236 ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t);
1237 ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t);
1241 /* Inode state bits. Protected by inode_lock. */
1242 #define I_DIRTY_SYNC 1 /* Not dirty enough for O_DATASYNC */
1243 #define I_DIRTY_DATASYNC 2 /* Data-related inode changes pending */
1244 #define I_DIRTY_PAGES 4 /* Data-related inode changes pending */
1246 #define I_LOCK (1 << __I_LOCK)
1247 #define I_FREEING 16
1250 #define I_WILL_FREE 128
1252 #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)
1254 extern void __mark_inode_dirty(struct inode *, int);
1255 static inline void mark_inode_dirty(struct inode *inode)
1257 __mark_inode_dirty(inode, I_DIRTY);
1260 static inline void mark_inode_dirty_sync(struct inode *inode)
1262 __mark_inode_dirty(inode, I_DIRTY_SYNC);
1266 * inc_nlink - directly increment an inode's link count
1269 * This is a low-level filesystem helper to replace any
1270 * direct filesystem manipulation of i_nlink. Currently,
1271 * it is only here for parity with dec_nlink().
1273 static inline void inc_nlink(struct inode *inode)
1278 static inline void inode_inc_link_count(struct inode *inode)
1281 mark_inode_dirty(inode);
1285 * drop_nlink - directly drop an inode's link count
1288 * This is a low-level filesystem helper to replace any
1289 * direct filesystem manipulation of i_nlink. In cases
1290 * where we are attempting to track writes to the
1291 * filesystem, a decrement to zero means an imminent
1292 * write when the file is truncated and actually unlinked
1293 * on the filesystem.
1295 static inline void drop_nlink(struct inode *inode)
1301 * clear_nlink - directly zero an inode's link count
1304 * This is a low-level filesystem helper to replace any
1305 * direct filesystem manipulation of i_nlink. See
1306 * drop_nlink() for why we care about i_nlink hitting zero.
1308 static inline void clear_nlink(struct inode *inode)
1313 static inline void inode_dec_link_count(struct inode *inode)
1316 mark_inode_dirty(inode);
1319 extern void touch_atime(struct vfsmount *mnt, struct dentry *dentry);
1320 static inline void file_accessed(struct file *file)
1322 if (!(file->f_flags & O_NOATIME))
1323 touch_atime(file->f_path.mnt, file->f_path.dentry);
1326 int sync_inode(struct inode *inode, struct writeback_control *wbc);
1328 struct file_system_type {
1331 int (*get_sb) (struct file_system_type *, int,
1332 const char *, void *, struct vfsmount *);
1333 void (*kill_sb) (struct super_block *);
1334 struct module *owner;
1335 struct file_system_type * next;
1336 struct list_head fs_supers;
1338 struct lock_class_key s_lock_key;
1339 struct lock_class_key s_umount_key;
1341 struct lock_class_key i_lock_key;
1342 struct lock_class_key i_mutex_key;
1343 struct lock_class_key i_mutex_dir_key;
1344 struct lock_class_key i_alloc_sem_key;
1347 extern int get_sb_bdev(struct file_system_type *fs_type,
1348 int flags, const char *dev_name, void *data,
1349 int (*fill_super)(struct super_block *, void *, int),
1350 struct vfsmount *mnt);
1351 extern int get_sb_single(struct file_system_type *fs_type,
1352 int flags, void *data,
1353 int (*fill_super)(struct super_block *, void *, int),
1354 struct vfsmount *mnt);
1355 extern int get_sb_nodev(struct file_system_type *fs_type,
1356 int flags, void *data,
1357 int (*fill_super)(struct super_block *, void *, int),
1358 struct vfsmount *mnt);
1359 void generic_shutdown_super(struct super_block *sb);
1360 void kill_block_super(struct super_block *sb);
1361 void kill_anon_super(struct super_block *sb);
1362 void kill_litter_super(struct super_block *sb);
1363 void deactivate_super(struct super_block *sb);
1364 int set_anon_super(struct super_block *s, void *data);
1365 struct super_block *sget(struct file_system_type *type,
1366 int (*test)(struct super_block *,void *),
1367 int (*set)(struct super_block *,void *),
1369 extern int get_sb_pseudo(struct file_system_type *, char *,
1370 const struct super_operations *ops, unsigned long,
1371 struct vfsmount *mnt);
1372 extern int simple_set_mnt(struct vfsmount *mnt, struct super_block *sb);
1373 int __put_super(struct super_block *sb);
1374 int __put_super_and_need_restart(struct super_block *sb);
1375 void unnamed_dev_init(void);
1377 /* Alas, no aliases. Too much hassle with bringing module.h everywhere */
1378 #define fops_get(fops) \
1379 (((fops) && try_module_get((fops)->owner) ? (fops) : NULL))
1380 #define fops_put(fops) \
1381 do { if (fops) module_put((fops)->owner); } while(0)
1383 extern int register_filesystem(struct file_system_type *);
1384 extern int unregister_filesystem(struct file_system_type *);
1385 extern struct vfsmount *kern_mount(struct file_system_type *);
1386 extern int may_umount_tree(struct vfsmount *);
1387 extern int may_umount(struct vfsmount *);
1388 extern void umount_tree(struct vfsmount *, int, struct list_head *);
1389 extern void release_mounts(struct list_head *);
1390 extern long do_mount(char *, char *, char *, unsigned long, void *);
1391 extern struct vfsmount *copy_tree(struct vfsmount *, struct dentry *, int);
1392 extern void mnt_set_mountpoint(struct vfsmount *, struct dentry *,
1395 extern int vfs_statfs(struct dentry *, struct kstatfs *);
1398 extern struct kset fs_subsys;
1400 #define FLOCK_VERIFY_READ 1
1401 #define FLOCK_VERIFY_WRITE 2
1403 extern int locks_mandatory_locked(struct inode *);
1404 extern int locks_mandatory_area(int, struct inode *, struct file *, loff_t, size_t);
1407 * Candidates for mandatory locking have the setgid bit set
1408 * but no group execute bit - an otherwise meaningless combination.
1411 static inline int __mandatory_lock(struct inode *ino)
1413 return (ino->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID;
1417 * ... and these candidates should be on MS_MANDLOCK mounted fs,
1418 * otherwise these will be advisory locks
1421 static inline int mandatory_lock(struct inode *ino)
1423 return IS_MANDLOCK(ino) && __mandatory_lock(ino);
1426 static inline int locks_verify_locked(struct inode *inode)
1428 if (mandatory_lock(inode))
1429 return locks_mandatory_locked(inode);
1433 extern int rw_verify_area(int, struct file *, loff_t *, size_t);
1435 static inline int locks_verify_truncate(struct inode *inode,
1439 if (inode->i_flock && mandatory_lock(inode))
1440 return locks_mandatory_area(
1441 FLOCK_VERIFY_WRITE, inode, filp,
1442 size < inode->i_size ? size : inode->i_size,
1443 (size < inode->i_size ? inode->i_size - size
1444 : size - inode->i_size)
1449 static inline int break_lease(struct inode *inode, unsigned int mode)
1452 return __break_lease(inode, mode);
1458 extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs,
1460 extern long do_sys_open(int fdf, const char __user *filename, int flags,
1462 extern struct file *filp_open(const char *, int, int);
1463 extern struct file * dentry_open(struct dentry *, struct vfsmount *, int);
1464 extern int filp_close(struct file *, fl_owner_t id);
1465 extern char * getname(const char __user *);
1468 extern void __init vfs_caches_init_early(void);
1469 extern void __init vfs_caches_init(unsigned long);
1471 extern struct kmem_cache *names_cachep;
1473 #define __getname() kmem_cache_alloc(names_cachep, GFP_KERNEL)
1474 #define __putname(name) kmem_cache_free(names_cachep, (void *)(name))
1475 #ifndef CONFIG_AUDITSYSCALL
1476 #define putname(name) __putname(name)
1478 extern void putname(const char *name);
1482 extern int register_blkdev(unsigned int, const char *);
1483 extern void unregister_blkdev(unsigned int, const char *);
1484 extern struct block_device *bdget(dev_t);
1485 extern void bd_set_size(struct block_device *, loff_t size);
1486 extern void bd_forget(struct inode *inode);
1487 extern void bdput(struct block_device *);
1488 extern struct block_device *open_by_devnum(dev_t, unsigned);
1489 extern const struct address_space_operations def_blk_aops;
1491 static inline void bd_forget(struct inode *inode) {}
1493 extern const struct file_operations def_blk_fops;
1494 extern const struct file_operations def_chr_fops;
1495 extern const struct file_operations bad_sock_fops;
1496 extern const struct file_operations def_fifo_fops;
1498 extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long);
1499 extern int blkdev_ioctl(struct inode *, struct file *, unsigned, unsigned long);
1500 extern int blkdev_driver_ioctl(struct inode *inode, struct file *file,
1501 struct gendisk *disk, unsigned cmd,
1503 extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long);
1504 extern int blkdev_get(struct block_device *, mode_t, unsigned);
1505 extern int blkdev_put(struct block_device *);
1506 extern int bd_claim(struct block_device *, void *);
1507 extern void bd_release(struct block_device *);
1509 extern int bd_claim_by_disk(struct block_device *, void *, struct gendisk *);
1510 extern void bd_release_from_disk(struct block_device *, struct gendisk *);
1512 #define bd_claim_by_disk(bdev, holder, disk) bd_claim(bdev, holder)
1513 #define bd_release_from_disk(bdev, disk) bd_release(bdev)
1518 #define CHRDEV_MAJOR_HASH_SIZE 255
1519 extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *);
1520 extern int register_chrdev_region(dev_t, unsigned, const char *);
1521 extern int register_chrdev(unsigned int, const char *,
1522 const struct file_operations *);
1523 extern void unregister_chrdev(unsigned int, const char *);
1524 extern void unregister_chrdev_region(dev_t, unsigned);
1525 extern int chrdev_open(struct inode *, struct file *);
1526 extern void chrdev_show(struct seq_file *,off_t);
1528 /* fs/block_dev.c */
1529 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
1532 #define BLKDEV_MAJOR_HASH_SIZE 255
1533 extern const char *__bdevname(dev_t, char *buffer);
1534 extern const char *bdevname(struct block_device *bdev, char *buffer);
1535 extern struct block_device *lookup_bdev(const char *);
1536 extern struct block_device *open_bdev_excl(const char *, int, void *);
1537 extern void close_bdev_excl(struct block_device *);
1538 extern void blkdev_show(struct seq_file *,off_t);
1540 #define BLKDEV_MAJOR_HASH_SIZE 0
1543 extern void init_special_inode(struct inode *, umode_t, dev_t);
1545 /* Invalid inode operations -- fs/bad_inode.c */
1546 extern void make_bad_inode(struct inode *);
1547 extern int is_bad_inode(struct inode *);
1549 extern const struct file_operations read_fifo_fops;
1550 extern const struct file_operations write_fifo_fops;
1551 extern const struct file_operations rdwr_fifo_fops;
1553 extern int fs_may_remount_ro(struct super_block *);
1557 * return READ, READA, or WRITE
1559 #define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK))
1562 * return data direction, READ or WRITE
1564 #define bio_data_dir(bio) ((bio)->bi_rw & 1)
1566 extern int check_disk_change(struct block_device *);
1567 extern int __invalidate_device(struct block_device *);
1568 extern int invalidate_partition(struct gendisk *, int);
1570 extern int invalidate_inodes(struct super_block *);
1571 unsigned long __invalidate_mapping_pages(struct address_space *mapping,
1572 pgoff_t start, pgoff_t end,
1574 unsigned long invalidate_mapping_pages(struct address_space *mapping,
1575 pgoff_t start, pgoff_t end);
1577 static inline unsigned long __deprecated
1578 invalidate_inode_pages(struct address_space *mapping)
1580 return invalidate_mapping_pages(mapping, 0, ~0UL);
1583 static inline void invalidate_remote_inode(struct inode *inode)
1585 if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1586 S_ISLNK(inode->i_mode))
1587 invalidate_mapping_pages(inode->i_mapping, 0, -1);
1589 extern int invalidate_inode_pages2(struct address_space *mapping);
1590 extern int invalidate_inode_pages2_range(struct address_space *mapping,
1591 pgoff_t start, pgoff_t end);
1592 extern int write_inode_now(struct inode *, int);
1593 extern int filemap_fdatawrite(struct address_space *);
1594 extern int filemap_flush(struct address_space *);
1595 extern int filemap_fdatawait(struct address_space *);
1596 extern int filemap_write_and_wait(struct address_space *mapping);
1597 extern int filemap_write_and_wait_range(struct address_space *mapping,
1598 loff_t lstart, loff_t lend);
1599 extern int wait_on_page_writeback_range(struct address_space *mapping,
1600 pgoff_t start, pgoff_t end);
1601 extern int __filemap_fdatawrite_range(struct address_space *mapping,
1602 loff_t start, loff_t end, int sync_mode);
1604 extern long do_fsync(struct file *file, int datasync);
1605 extern void sync_supers(void);
1606 extern void sync_filesystems(int wait);
1607 extern void __fsync_super(struct super_block *sb);
1608 extern void emergency_sync(void);
1609 extern void emergency_remount(void);
1610 extern int do_remount_sb(struct super_block *sb, int flags,
1611 void *data, int force);
1613 extern sector_t bmap(struct inode *, sector_t);
1615 extern int notify_change(struct dentry *, struct iattr *);
1616 extern int permission(struct inode *, int, struct nameidata *);
1617 extern int generic_permission(struct inode *, int,
1618 int (*check_acl)(struct inode *, int));
1620 extern int get_write_access(struct inode *);
1621 extern int deny_write_access(struct file *);
1622 static inline void put_write_access(struct inode * inode)
1624 atomic_dec(&inode->i_writecount);
1626 static inline void allow_write_access(struct file *file)
1629 atomic_inc(&file->f_path.dentry->d_inode->i_writecount);
1631 extern int do_pipe(int *);
1632 extern struct file *create_read_pipe(struct file *f);
1633 extern struct file *create_write_pipe(void);
1634 extern void free_write_pipe(struct file *);
1636 extern int open_namei(int dfd, const char *, int, int, struct nameidata *);
1637 extern int may_open(struct nameidata *, int, int);
1639 extern int kernel_read(struct file *, unsigned long, char *, unsigned long);
1640 extern struct file * open_exec(const char *);
1642 /* fs/dcache.c -- generic fs support functions */
1643 extern int is_subdir(struct dentry *, struct dentry *);
1644 extern ino_t find_inode_number(struct dentry *, struct qstr *);
1646 #include <linux/err.h>
1648 /* needed for stackable file system support */
1649 extern loff_t default_llseek(struct file *file, loff_t offset, int origin);
1651 extern loff_t vfs_llseek(struct file *file, loff_t offset, int origin);
1653 extern void inode_init_once(struct inode *);
1654 extern void iput(struct inode *);
1655 extern struct inode * igrab(struct inode *);
1656 extern ino_t iunique(struct super_block *, ino_t);
1657 extern int inode_needs_sync(struct inode *inode);
1658 extern void generic_delete_inode(struct inode *inode);
1659 extern void generic_drop_inode(struct inode *inode);
1661 extern struct inode *ilookup5_nowait(struct super_block *sb,
1662 unsigned long hashval, int (*test)(struct inode *, void *),
1664 extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval,
1665 int (*test)(struct inode *, void *), void *data);
1666 extern struct inode *ilookup(struct super_block *sb, unsigned long ino);
1668 extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *);
1669 extern struct inode * iget_locked(struct super_block *, unsigned long);
1670 extern void unlock_new_inode(struct inode *);
1672 static inline struct inode *iget(struct super_block *sb, unsigned long ino)
1674 struct inode *inode = iget_locked(sb, ino);
1676 if (inode && (inode->i_state & I_NEW)) {
1677 sb->s_op->read_inode(inode);
1678 unlock_new_inode(inode);
1684 extern void __iget(struct inode * inode);
1685 extern void clear_inode(struct inode *);
1686 extern void destroy_inode(struct inode *);
1687 extern struct inode *new_inode(struct super_block *);
1688 extern int __remove_suid(struct dentry *, int);
1689 extern int should_remove_suid(struct dentry *);
1690 extern int remove_suid(struct dentry *);
1692 extern void __insert_inode_hash(struct inode *, unsigned long hashval);
1693 extern void remove_inode_hash(struct inode *);
1694 static inline void insert_inode_hash(struct inode *inode) {
1695 __insert_inode_hash(inode, inode->i_ino);
1698 extern struct file * get_empty_filp(void);
1699 extern void file_move(struct file *f, struct list_head *list);
1700 extern void file_kill(struct file *f);
1703 extern void submit_bio(int, struct bio *);
1704 extern int bdev_read_only(struct block_device *);
1706 extern int set_blocksize(struct block_device *, int);
1707 extern int sb_set_blocksize(struct super_block *, int);
1708 extern int sb_min_blocksize(struct super_block *, int);
1710 extern int generic_file_mmap(struct file *, struct vm_area_struct *);
1711 extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *);
1712 extern int file_read_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size);
1713 int generic_write_checks(struct file *file, loff_t *pos, size_t *count, int isblk);
1714 extern ssize_t generic_file_aio_read(struct kiocb *, const struct iovec *, unsigned long, loff_t);
1715 extern ssize_t generic_file_aio_write(struct kiocb *, const struct iovec *, unsigned long, loff_t);
1716 extern ssize_t generic_file_aio_write_nolock(struct kiocb *, const struct iovec *,
1717 unsigned long, loff_t);
1718 extern ssize_t generic_file_direct_write(struct kiocb *, const struct iovec *,
1719 unsigned long *, loff_t, loff_t *, size_t, size_t);
1720 extern ssize_t generic_file_buffered_write(struct kiocb *, const struct iovec *,
1721 unsigned long, loff_t, loff_t *, size_t, ssize_t);
1722 extern ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos);
1723 extern ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos);
1724 extern void do_generic_mapping_read(struct address_space *mapping,
1725 struct file_ra_state *, struct file *,
1726 loff_t *, read_descriptor_t *, read_actor_t);
1727 extern int generic_segment_checks(const struct iovec *iov,
1728 unsigned long *nr_segs, size_t *count, int access_flags);
1731 extern ssize_t generic_file_splice_read(struct file *, loff_t *,
1732 struct pipe_inode_info *, size_t, unsigned int);
1733 extern ssize_t generic_file_splice_write(struct pipe_inode_info *,
1734 struct file *, loff_t *, size_t, unsigned int);
1735 extern ssize_t generic_file_splice_write_nolock(struct pipe_inode_info *,
1736 struct file *, loff_t *, size_t, unsigned int);
1737 extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe,
1738 struct file *out, loff_t *, size_t len, unsigned int flags);
1739 extern long do_splice_direct(struct file *in, loff_t *ppos, struct file *out,
1740 size_t len, unsigned int flags);
1743 file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping);
1744 extern loff_t no_llseek(struct file *file, loff_t offset, int origin);
1745 extern loff_t generic_file_llseek(struct file *file, loff_t offset, int origin);
1746 extern loff_t remote_llseek(struct file *file, loff_t offset, int origin);
1747 extern int generic_file_open(struct inode * inode, struct file * filp);
1748 extern int nonseekable_open(struct inode * inode, struct file * filp);
1750 #ifdef CONFIG_FS_XIP
1751 extern ssize_t xip_file_read(struct file *filp, char __user *buf, size_t len,
1753 extern int xip_file_mmap(struct file * file, struct vm_area_struct * vma);
1754 extern ssize_t xip_file_write(struct file *filp, const char __user *buf,
1755 size_t len, loff_t *ppos);
1756 extern int xip_truncate_page(struct address_space *mapping, loff_t from);
1758 static inline int xip_truncate_page(struct address_space *mapping, loff_t from)
1764 static inline void do_generic_file_read(struct file * filp, loff_t *ppos,
1765 read_descriptor_t * desc,
1768 do_generic_mapping_read(filp->f_mapping,
1777 ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
1778 struct block_device *bdev, const struct iovec *iov, loff_t offset,
1779 unsigned long nr_segs, get_block_t get_block, dio_iodone_t end_io,
1783 DIO_LOCKING = 1, /* need locking between buffered and direct access */
1784 DIO_NO_LOCKING, /* bdev; no locking at all between buffered/direct */
1785 DIO_OWN_LOCKING, /* filesystem locks buffered and direct internally */
1788 static inline ssize_t blockdev_direct_IO(int rw, struct kiocb *iocb,
1789 struct inode *inode, struct block_device *bdev, const struct iovec *iov,
1790 loff_t offset, unsigned long nr_segs, get_block_t get_block,
1791 dio_iodone_t end_io)
1793 return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
1794 nr_segs, get_block, end_io, DIO_LOCKING);
1797 static inline ssize_t blockdev_direct_IO_no_locking(int rw, struct kiocb *iocb,
1798 struct inode *inode, struct block_device *bdev, const struct iovec *iov,
1799 loff_t offset, unsigned long nr_segs, get_block_t get_block,
1800 dio_iodone_t end_io)
1802 return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
1803 nr_segs, get_block, end_io, DIO_NO_LOCKING);
1806 static inline ssize_t blockdev_direct_IO_own_locking(int rw, struct kiocb *iocb,
1807 struct inode *inode, struct block_device *bdev, const struct iovec *iov,
1808 loff_t offset, unsigned long nr_segs, get_block_t get_block,
1809 dio_iodone_t end_io)
1811 return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
1812 nr_segs, get_block, end_io, DIO_OWN_LOCKING);
1816 extern const struct file_operations generic_ro_fops;
1818 #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))
1820 extern int vfs_readlink(struct dentry *, char __user *, int, const char *);
1821 extern int vfs_follow_link(struct nameidata *, const char *);
1822 extern int page_readlink(struct dentry *, char __user *, int);
1823 extern void *page_follow_link_light(struct dentry *, struct nameidata *);
1824 extern void page_put_link(struct dentry *, struct nameidata *, void *);
1825 extern int __page_symlink(struct inode *inode, const char *symname, int len,
1827 extern int page_symlink(struct inode *inode, const char *symname, int len);
1828 extern const struct inode_operations page_symlink_inode_operations;
1829 extern int generic_readlink(struct dentry *, char __user *, int);
1830 extern void generic_fillattr(struct inode *, struct kstat *);
1831 extern int vfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
1832 void inode_add_bytes(struct inode *inode, loff_t bytes);
1833 void inode_sub_bytes(struct inode *inode, loff_t bytes);
1834 loff_t inode_get_bytes(struct inode *inode);
1835 void inode_set_bytes(struct inode *inode, loff_t bytes);
1837 extern int vfs_readdir(struct file *, filldir_t, void *);
1839 extern int vfs_stat(char __user *, struct kstat *);
1840 extern int vfs_lstat(char __user *, struct kstat *);
1841 extern int vfs_stat_fd(int dfd, char __user *, struct kstat *);
1842 extern int vfs_lstat_fd(int dfd, char __user *, struct kstat *);
1843 extern int vfs_fstat(unsigned int, struct kstat *);
1845 extern int vfs_ioctl(struct file *, unsigned int, unsigned int, unsigned long);
1847 extern struct file_system_type *get_fs_type(const char *name);
1848 extern struct super_block *get_super(struct block_device *);
1849 extern struct super_block *user_get_super(dev_t);
1850 extern void drop_super(struct super_block *sb);
1852 extern int dcache_dir_open(struct inode *, struct file *);
1853 extern int dcache_dir_close(struct inode *, struct file *);
1854 extern loff_t dcache_dir_lseek(struct file *, loff_t, int);
1855 extern int dcache_readdir(struct file *, void *, filldir_t);
1856 extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *);
1857 extern int simple_statfs(struct dentry *, struct kstatfs *);
1858 extern int simple_link(struct dentry *, struct inode *, struct dentry *);
1859 extern int simple_unlink(struct inode *, struct dentry *);
1860 extern int simple_rmdir(struct inode *, struct dentry *);
1861 extern int simple_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
1862 extern int simple_sync_file(struct file *, struct dentry *, int);
1863 extern int simple_empty(struct dentry *);
1864 extern int simple_readpage(struct file *file, struct page *page);
1865 extern int simple_prepare_write(struct file *file, struct page *page,
1866 unsigned offset, unsigned to);
1867 extern int simple_commit_write(struct file *file, struct page *page,
1868 unsigned offset, unsigned to);
1870 extern struct dentry *simple_lookup(struct inode *, struct dentry *, struct nameidata *);
1871 extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *);
1872 extern const struct file_operations simple_dir_operations;
1873 extern const struct inode_operations simple_dir_inode_operations;
1874 struct tree_descr { char *name; const struct file_operations *ops; int mode; };
1875 struct dentry *d_alloc_name(struct dentry *, const char *);
1876 extern int simple_fill_super(struct super_block *, int, struct tree_descr *);
1877 extern int simple_pin_fs(struct file_system_type *, struct vfsmount **mount, int *count);
1878 extern void simple_release_fs(struct vfsmount **mount, int *count);
1880 extern ssize_t simple_read_from_buffer(void __user *, size_t, loff_t *, const void *, size_t);
1882 #ifdef CONFIG_MIGRATION
1883 extern int buffer_migrate_page(struct address_space *,
1884 struct page *, struct page *);
1886 #define buffer_migrate_page NULL
1889 extern int inode_change_ok(struct inode *, struct iattr *);
1890 extern int __must_check inode_setattr(struct inode *, struct iattr *);
1892 extern void file_update_time(struct file *file);
1894 static inline ino_t parent_ino(struct dentry *dentry)
1898 spin_lock(&dentry->d_lock);
1899 res = dentry->d_parent->d_inode->i_ino;
1900 spin_unlock(&dentry->d_lock);
1905 extern int unshare_files(void);
1907 /* Transaction based IO helpers */
1910 * An argresp is stored in an allocated page and holds the
1911 * size of the argument or response, along with its content
1913 struct simple_transaction_argresp {
1918 #define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp))
1920 char *simple_transaction_get(struct file *file, const char __user *buf,
1922 ssize_t simple_transaction_read(struct file *file, char __user *buf,
1923 size_t size, loff_t *pos);
1924 int simple_transaction_release(struct inode *inode, struct file *file);
1926 static inline void simple_transaction_set(struct file *file, size_t n)
1928 struct simple_transaction_argresp *ar = file->private_data;
1930 BUG_ON(n > SIMPLE_TRANSACTION_LIMIT);
1933 * The barrier ensures that ar->size will really remain zero until
1934 * ar->data is ready for reading.
1941 * simple attribute files
1943 * These attributes behave similar to those in sysfs:
1945 * Writing to an attribute immediately sets a value, an open file can be
1946 * written to multiple times.
1948 * Reading from an attribute creates a buffer from the value that might get
1949 * read with multiple read calls. When the attribute has been read
1950 * completely, no further read calls are possible until the file is opened
1953 * All attributes contain a text representation of a numeric value
1954 * that are accessed with the get() and set() functions.
1956 #define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \
1957 static int __fops ## _open(struct inode *inode, struct file *file) \
1959 __simple_attr_check_format(__fmt, 0ull); \
1960 return simple_attr_open(inode, file, __get, __set, __fmt); \
1962 static struct file_operations __fops = { \
1963 .owner = THIS_MODULE, \
1964 .open = __fops ## _open, \
1965 .release = simple_attr_close, \
1966 .read = simple_attr_read, \
1967 .write = simple_attr_write, \
1970 static inline void __attribute__((format(printf, 1, 2)))
1971 __simple_attr_check_format(const char *fmt, ...)
1973 /* don't do anything, just let the compiler check the arguments; */
1976 int simple_attr_open(struct inode *inode, struct file *file,
1977 u64 (*get)(void *), void (*set)(void *, u64),
1979 int simple_attr_close(struct inode *inode, struct file *file);
1980 ssize_t simple_attr_read(struct file *file, char __user *buf,
1981 size_t len, loff_t *ppos);
1982 ssize_t simple_attr_write(struct file *file, const char __user *buf,
1983 size_t len, loff_t *ppos);
1986 #ifdef CONFIG_SECURITY
1987 static inline char *alloc_secdata(void)
1989 return (char *)get_zeroed_page(GFP_KERNEL);
1992 static inline void free_secdata(void *secdata)
1994 free_page((unsigned long)secdata);
1997 static inline char *alloc_secdata(void)
2002 static inline void free_secdata(void *secdata)
2004 #endif /* CONFIG_SECURITY */
2006 int proc_nr_files(ctl_table *table, int write, struct file *filp,
2007 void __user *buffer, size_t *lenp, loff_t *ppos);
2010 #endif /* __KERNEL__ */
2011 #endif /* _LINUX_FS_H */