5 * This file has definitions for some important file table
9 #include <linux/config.h>
10 #include <linux/limits.h>
11 #include <linux/ioctl.h>
14 * It's silly to have NR_OPEN bigger than NR_FILE, but you can change
15 * the file limit at runtime and only root can increase the per-process
16 * nr_file rlimit, so it's safe to set up a ridiculously high absolute
17 * upper limit on files-per-process.
19 * Some programs (notably those using select()) may have to be
20 * recompiled to take full advantage of the new limits..
23 /* Fixed constants first: */
25 #define NR_OPEN (1024*1024) /* Absolute upper limit on fd num */
26 #define INR_OPEN 4096 /* Initial setting for nfile rlimits */
28 #define BLOCK_SIZE_BITS 10
29 #define BLOCK_SIZE (1<<BLOCK_SIZE_BITS)
31 /* And dynamically-tunable limits and defaults: */
32 struct files_stat_struct {
33 int nr_files; /* read only */
34 int nr_free_files; /* read only */
35 int max_files; /* tunable */
37 extern struct files_stat_struct files_stat;
39 struct inodes_stat_t {
44 extern struct inodes_stat_t inodes_stat;
46 extern int leases_enable, lease_break_time;
49 extern int dir_notify_enable;
52 #define NR_FILE 8192 /* this can well be larger on a larger system */
62 /* Internal kernel extensions */
65 #define FMODE_PWRITE FMODE_PREAD /* These go hand in hand */
71 #define READA 2 /* read-ahead - don't block if no resources */
72 #define SPECIAL 4 /* For non-blockdevice requests in request queue */
73 #define READ_SYNC (READ | (1 << BIO_RW_SYNC))
74 #define WRITE_SYNC (WRITE | (1 << BIO_RW_SYNC))
75 #define WRITE_BARRIER ((1 << BIO_RW) | (1 << BIO_RW_BARRIER))
81 /* public flags for file_system_type */
82 #define FS_REQUIRES_DEV 1
83 #define FS_BINARY_MOUNTDATA 2
84 #define FS_REVAL_DOT 16384 /* Check the paths ".", ".." for staleness */
85 #define FS_ODD_RENAME 32768 /* Temporary stuff; will go away as soon
86 * as nfs_rename() will be cleaned up
89 * These are the fs-independent mount-flags: up to 32 flags are supported
91 #define MS_RDONLY 1 /* Mount read-only */
92 #define MS_NOSUID 2 /* Ignore suid and sgid bits */
93 #define MS_NODEV 4 /* Disallow access to device special files */
94 #define MS_NOEXEC 8 /* Disallow program execution */
95 #define MS_SYNCHRONOUS 16 /* Writes are synced at once */
96 #define MS_REMOUNT 32 /* Alter flags of a mounted FS */
97 #define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */
98 #define MS_DIRSYNC 128 /* Directory modifications are synchronous */
99 #define MS_NOATIME 1024 /* Do not update access times. */
100 #define MS_NODIRATIME 2048 /* Do not update directory access times */
104 #define MS_VERBOSE 32768
105 #define MS_POSIXACL (1<<16) /* VFS does not apply the umask */
106 #define MS_TAGXID (1<<24) /* tag inodes with context information */
107 #define MS_XID (1<<25) /* use specific xid for this mount */
108 #define MS_ACTIVE (1<<30)
109 #define MS_NOUSER (1<<31)
112 * Superblock flags that can be altered by MS_REMOUNT
114 #define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_NOATIME|\
118 * Old magic mount flag and mask
120 #define MS_MGC_VAL 0xC0ED0000
121 #define MS_MGC_MSK 0xffff0000
123 /* Inode flags - they have nothing to superblock flags now */
125 #define S_SYNC 1 /* Writes are synced at once */
126 #define S_NOATIME 2 /* Do not update access times */
127 #define S_APPEND 4 /* Append-only file */
128 #define S_IMMUTABLE 8 /* Immutable file */
129 #define S_DEAD 16 /* removed, but still open directory */
130 #define S_NOQUOTA 32 /* Inode is not counted to quota */
131 #define S_DIRSYNC 64 /* Directory modifications are synchronous */
132 #define S_NOCMTIME 128 /* Do not update file c/mtime */
133 #define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */
134 #define S_PRIVATE 512 /* Inode is fs-internal */
135 #define S_BARRIER 1024 /* Barrier for chroot() */
136 #define S_IUNLINK 2048 /* Immutable unlink */
139 * Note that nosuid etc flags are inode-specific: setting some file-system
140 * flags just means all the inodes inherit those flags by default. It might be
141 * possible to override it selectively if you really wanted to with some
142 * ioctl() that is not currently implemented.
144 * Exception: MS_RDONLY is always applied to the entire file system.
146 * Unfortunately, it is possible to change a filesystems flags with it mounted
147 * with files in use. This means that all of the inodes will not have their
148 * i_flags updated. Hence, i_flags no longer inherit the superblock mount
149 * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
151 #define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg))
153 #define IS_RDONLY(inode) __IS_FLG(inode, MS_RDONLY)
154 #define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \
155 ((inode)->i_flags & S_SYNC))
156 #define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \
157 ((inode)->i_flags & (S_SYNC|S_DIRSYNC)))
158 #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK)
160 #define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA)
161 #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
162 #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE)
163 #define IS_IUNLINK(inode) ((inode)->i_flags & S_IUNLINK)
164 #define IS_IXORUNLINK(inode) ((IS_IUNLINK(inode) ? S_IMMUTABLE : 0) ^ IS_IMMUTABLE(inode))
165 #define IS_NOATIME(inode) (__IS_FLG(inode, MS_NOATIME) || ((inode)->i_flags & S_NOATIME))
166 #define IS_NODIRATIME(inode) __IS_FLG(inode, MS_NODIRATIME)
167 #define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL)
169 #define IS_BARRIER(inode) (S_ISDIR((inode)->i_mode) && ((inode)->i_flags & S_BARRIER))
170 #define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD)
171 #define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME)
172 #define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE)
173 #define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE)
175 /* the read-only stuff doesn't really belong here, but any other place is
176 probably as bad and I don't want to create yet another include file. */
178 #define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */
179 #define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */
180 #define BLKRRPART _IO(0x12,95) /* re-read partition table */
181 #define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */
182 #define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */
183 #define BLKRASET _IO(0x12,98) /* set read ahead for block device */
184 #define BLKRAGET _IO(0x12,99) /* get current read ahead setting */
185 #define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */
186 #define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */
187 #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */
188 #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */
189 #define BLKSSZGET _IO(0x12,104)/* get block device sector size */
191 #define BLKPG _IO(0x12,105)/* See blkpg.h */
193 /* Some people are morons. Do not use sizeof! */
195 #define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */
196 #define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */
197 /* This was here just to show that the number is taken -
198 probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */
200 /* A jump here: 108-111 have been used for various private purposes. */
201 #define BLKBSZGET _IOR(0x12,112,size_t)
202 #define BLKBSZSET _IOW(0x12,113,size_t)
203 #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
205 #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
206 #define FIBMAP _IO(0x00,1) /* bmap access */
207 #define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */
211 #include <linux/linkage.h>
212 #include <linux/wait.h>
213 #include <linux/types.h>
214 #include <linux/kdev_t.h>
215 #include <linux/dcache.h>
216 #include <linux/stat.h>
217 #include <linux/cache.h>
218 #include <linux/kobject.h>
219 #include <linux/list.h>
220 #include <linux/radix-tree.h>
221 #include <linux/prio_tree.h>
222 #include <linux/init.h>
223 #include <linux/mount.h>
225 #include <asm/atomic.h>
226 #include <asm/semaphore.h>
227 #include <asm/byteorder.h>
231 struct pipe_inode_info;
232 struct poll_table_struct;
234 struct vm_area_struct;
237 /* Used to be a macro which just called the function, now just a function */
238 extern void update_atime (struct inode *);
240 extern void __init inode_init(unsigned long);
241 extern void __init inode_init_early(void);
242 extern void __init mnt_init(unsigned long);
243 extern void __init files_init(unsigned long);
246 typedef int (get_block_t)(struct inode *inode, sector_t iblock,
247 struct buffer_head *bh_result, int create);
248 typedef int (get_blocks_t)(struct inode *inode, sector_t iblock,
249 unsigned long max_blocks,
250 struct buffer_head *bh_result, int create);
251 typedef void (dio_iodone_t)(struct inode *inode, loff_t offset,
252 ssize_t bytes, void *private);
255 * Attribute flags. These should be or-ed together to figure out what
262 #define ATTR_ATIME 16
263 #define ATTR_MTIME 32
264 #define ATTR_CTIME 64
265 #define ATTR_ATIME_SET 128
266 #define ATTR_MTIME_SET 256
267 #define ATTR_FORCE 512 /* Not a change, but a change it */
268 #define ATTR_ATTR_FLAG 1024
269 #define ATTR_KILL_SUID 2048
270 #define ATTR_KILL_SGID 4096
271 #define ATTR_XID 8192
274 * This is the Inode Attributes structure, used for notify_change(). It
275 * uses the above definitions as flags, to know which values have changed.
276 * Also, in this manner, a Filesystem can look at only the values it cares
277 * about. Basically, these are the attributes that the VFS layer can
278 * request to change from the FS layer.
280 * Derek Atkins <warlord@MIT.EDU> 94-10-20
283 unsigned int ia_valid;
289 struct timespec ia_atime;
290 struct timespec ia_mtime;
291 struct timespec ia_ctime;
292 unsigned int ia_attr_flags;
296 * This is the inode attributes flag definitions
298 #define ATTR_FLAG_SYNCRONOUS 1 /* Syncronous write */
299 #define ATTR_FLAG_NOATIME 2 /* Don't update atime */
300 #define ATTR_FLAG_APPEND 4 /* Append-only file */
301 #define ATTR_FLAG_IMMUTABLE 8 /* Immutable file */
302 #define ATTR_FLAG_NODIRATIME 16 /* Don't update atime for directory */
304 #define ATTR_FLAG_BARRIER 512 /* Barrier for chroot() */
305 #define ATTR_FLAG_IUNLINK 1024 /* Immutable unlink */
308 * Includes for diskquotas.
310 #include <linux/quota.h>
313 * oh the beauties of C type declarations.
316 struct address_space;
317 struct writeback_control;
320 struct address_space_operations {
321 int (*writepage)(struct page *page, struct writeback_control *wbc);
322 int (*readpage)(struct file *, struct page *);
323 int (*sync_page)(struct page *);
325 /* Write back some dirty pages from this mapping. */
326 int (*writepages)(struct address_space *, struct writeback_control *);
328 /* Set a page dirty */
329 int (*set_page_dirty)(struct page *page);
331 int (*readpages)(struct file *filp, struct address_space *mapping,
332 struct list_head *pages, unsigned nr_pages);
335 * ext3 requires that a successful prepare_write() call be followed
336 * by a commit_write() call - they must be balanced
338 int (*prepare_write)(struct file *, struct page *, unsigned, unsigned);
339 int (*commit_write)(struct file *, struct page *, unsigned, unsigned);
340 /* Unfortunately this kludge is needed for FIBMAP. Don't use it */
341 sector_t (*bmap)(struct address_space *, sector_t);
342 int (*invalidatepage) (struct page *, unsigned long);
343 int (*releasepage) (struct page *, int);
344 ssize_t (*direct_IO)(int, struct kiocb *, const struct iovec *iov,
345 loff_t offset, unsigned long nr_segs);
348 struct backing_dev_info;
349 struct address_space {
350 struct inode *host; /* owner: inode, block_device */
351 struct radix_tree_root page_tree; /* radix tree of all pages */
352 rwlock_t tree_lock; /* and rwlock protecting it */
353 unsigned int i_mmap_writable;/* count VM_SHARED mappings */
354 struct prio_tree_root i_mmap; /* tree of private and shared mappings */
355 struct list_head i_mmap_nonlinear;/*list VM_NONLINEAR mappings */
356 spinlock_t i_mmap_lock; /* protect tree, count, list */
357 unsigned int truncate_count; /* Cover race condition with truncate */
358 unsigned long nrpages; /* number of total pages */
359 pgoff_t writeback_index;/* writeback starts here */
360 struct address_space_operations *a_ops; /* methods */
361 unsigned long flags; /* error bits/gfp mask */
362 struct backing_dev_info *backing_dev_info; /* device readahead, etc */
363 spinlock_t private_lock; /* for use by the address_space */
364 struct list_head private_list; /* ditto */
365 struct address_space *assoc_mapping; /* ditto */
366 } __attribute__((aligned(sizeof(long))));
368 * On most architectures that alignment is already the case; but
369 * must be enforced here for CRIS, to let the least signficant bit
370 * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON.
373 struct block_device {
374 dev_t bd_dev; /* not a kdev_t - it's a search key */
375 struct inode * bd_inode; /* will die */
377 struct semaphore bd_sem; /* open/close mutex */
378 struct semaphore bd_mount_sem; /* mount mutex */
379 struct list_head bd_inodes;
382 struct block_device * bd_contains;
383 unsigned bd_block_size;
384 struct hd_struct * bd_part;
385 /* number of times partitions within this device have been opened. */
386 unsigned bd_part_count;
388 struct gendisk * bd_disk;
389 struct list_head bd_list;
390 struct backing_dev_info *bd_inode_backing_dev_info;
392 * Private data. You must have bd_claim'ed the block_device
393 * to use this. NOTE: bd_claim allows an owner to claim
394 * the same device multiple times, the owner must take special
395 * care to not mess up bd_private for that case.
397 unsigned long bd_private;
401 * Radix-tree tags, for tagging dirty and writeback pages within the pagecache
404 #define PAGECACHE_TAG_DIRTY 0
405 #define PAGECACHE_TAG_WRITEBACK 1
407 int mapping_tagged(struct address_space *mapping, int tag);
410 * Might pages of this file be mapped into userspace?
412 static inline int mapping_mapped(struct address_space *mapping)
414 return !prio_tree_empty(&mapping->i_mmap) ||
415 !list_empty(&mapping->i_mmap_nonlinear);
419 * Might pages of this file have been modified in userspace?
420 * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff
421 * marks vma as VM_SHARED if it is shared, and the file was opened for
422 * writing i.e. vma may be mprotected writable even if now readonly.
424 static inline int mapping_writably_mapped(struct address_space *mapping)
426 return mapping->i_mmap_writable != 0;
430 * Use sequence counter to get consistent i_size on 32-bit processors.
432 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
433 #include <linux/seqlock.h>
434 #define __NEED_I_SIZE_ORDERED
435 #define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount)
437 #define i_size_ordered_init(inode) do { } while (0)
441 struct hlist_node i_hash;
442 struct list_head i_list;
443 struct list_head i_sb_list;
444 struct list_head i_dentry;
448 unsigned int i_nlink;
454 struct timespec i_atime;
455 struct timespec i_mtime;
456 struct timespec i_ctime;
457 unsigned int i_blkbits;
458 unsigned long i_blksize;
459 unsigned long i_version;
460 unsigned long i_blocks;
461 unsigned short i_bytes;
462 spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */
463 struct semaphore i_sem;
464 struct rw_semaphore i_alloc_sem;
465 struct inode_operations *i_op;
466 struct file_operations *i_fop; /* former ->i_op->default_file_ops */
467 struct super_block *i_sb;
468 struct file_lock *i_flock;
469 struct address_space *i_mapping;
470 struct address_space i_data;
472 struct dquot *i_dquot[MAXQUOTAS];
474 /* These three should probably be a union */
475 struct list_head i_devices;
476 struct pipe_inode_info *i_pipe;
477 struct block_device *i_bdev;
483 #ifdef CONFIG_DNOTIFY
484 unsigned long i_dnotify_mask; /* Directory notify events */
485 struct dnotify_struct *i_dnotify; /* for directory notifications */
488 unsigned long i_state;
489 unsigned long dirtied_when; /* jiffies of first dirtying */
491 unsigned int i_flags;
493 atomic_t i_writecount;
498 #ifdef __NEED_I_SIZE_ORDERED
499 seqcount_t i_size_seqcount;
504 * NOTE: in a 32bit arch with a preemptable kernel and
505 * an UP compile the i_size_read/write must be atomic
506 * with respect to the local cpu (unlike with preempt disabled),
507 * but they don't need to be atomic with respect to other cpus like in
508 * true SMP (so they need either to either locally disable irq around
509 * the read or for example on x86 they can be still implemented as a
510 * cmpxchg8b without the need of the lock prefix). For SMP compiles
511 * and 64bit archs it makes no difference if preempt is enabled or not.
513 static inline loff_t i_size_read(struct inode *inode)
515 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
520 seq = read_seqcount_begin(&inode->i_size_seqcount);
521 i_size = inode->i_size;
522 } while (read_seqcount_retry(&inode->i_size_seqcount, seq));
524 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
528 i_size = inode->i_size;
532 return inode->i_size;
537 static inline void i_size_write(struct inode *inode, loff_t i_size)
539 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
540 write_seqcount_begin(&inode->i_size_seqcount);
541 inode->i_size = i_size;
542 write_seqcount_end(&inode->i_size_seqcount);
543 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
545 inode->i_size = i_size;
548 inode->i_size = i_size;
552 static inline unsigned iminor(struct inode *inode)
554 return MINOR(inode->i_rdev);
557 static inline unsigned imajor(struct inode *inode)
559 return MAJOR(inode->i_rdev);
562 extern struct block_device *I_BDEV(struct inode *inode);
565 rwlock_t lock; /* protects pid, uid, euid fields */
566 int pid; /* pid or -pgrp where SIGIO should be sent */
567 uid_t uid, euid; /* uid/euid of process setting the owner */
569 int signum; /* posix.1b rt signal to be delivered on IO */
573 * Track a single file's readahead state
575 struct file_ra_state {
576 unsigned long start; /* Current window */
578 unsigned long flags; /* ra flags RA_FLAG_xxx*/
579 unsigned long cache_hit; /* cache hit count*/
580 unsigned long prev_page; /* Cache last read() position */
581 unsigned long ahead_start; /* Ahead window */
582 unsigned long ahead_size;
583 unsigned long ra_pages; /* Maximum readahead window */
584 unsigned long mmap_hit; /* Cache hit stat for mmap accesses */
585 unsigned long mmap_miss; /* Cache miss stat for mmap accesses */
587 #define RA_FLAG_MISS 0x01 /* a cache miss occured against this file */
588 #define RA_FLAG_INCACHE 0x02 /* file is already in cache */
591 struct list_head f_list;
592 struct dentry *f_dentry;
593 struct vfsmount *f_vfsmnt;
594 struct file_operations *f_op;
596 unsigned int f_flags;
600 struct fown_struct f_owner;
601 unsigned int f_uid, f_gid;
602 struct file_ra_state f_ra;
606 unsigned long f_version;
609 /* needed for tty driver, and maybe others */
613 /* Used by fs/eventpoll.c to link all the hooks to this file */
614 struct list_head f_ep_links;
615 spinlock_t f_ep_lock;
616 #endif /* #ifdef CONFIG_EPOLL */
617 struct address_space *f_mapping;
619 extern spinlock_t files_lock;
620 #define file_list_lock() spin_lock(&files_lock);
621 #define file_list_unlock() spin_unlock(&files_lock);
623 #define get_file(x) atomic_inc(&(x)->f_count)
624 #define file_count(x) atomic_read(&(x)->f_count)
626 #define MAX_NON_LFS ((1UL<<31) - 1)
628 /* Page cache limit. The filesystems should put that into their s_maxbytes
629 limits, otherwise bad things can happen in VM. */
630 #if BITS_PER_LONG==32
631 #define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
632 #elif BITS_PER_LONG==64
633 #define MAX_LFS_FILESIZE 0x7fffffffffffffffUL
638 #define FL_ACCESS 8 /* not trying to lock, just looking */
639 #define FL_LOCKD 16 /* lock held by rpc.lockd */
640 #define FL_LEASE 32 /* lease held on this file */
641 #define FL_SLEEP 128 /* A blocking lock */
644 * The POSIX file lock owner is determined by
645 * the "struct files_struct" in the thread group
646 * (or NULL for no owner - BSD locks).
648 * Lockd stuffs a "host" pointer into this.
650 typedef struct files_struct *fl_owner_t;
652 struct file_lock_operations {
653 void (*fl_insert)(struct file_lock *); /* lock insertion callback */
654 void (*fl_remove)(struct file_lock *); /* lock removal callback */
655 void (*fl_copy_lock)(struct file_lock *, struct file_lock *);
656 void (*fl_release_private)(struct file_lock *);
659 struct lock_manager_operations {
660 int (*fl_compare_owner)(struct file_lock *, struct file_lock *);
661 void (*fl_notify)(struct file_lock *); /* unblock callback */
662 void (*fl_copy_lock)(struct file_lock *, struct file_lock *);
663 void (*fl_release_private)(struct file_lock *);
664 void (*fl_break)(struct file_lock *);
665 int (*fl_mylease)(struct file_lock *, struct file_lock *);
666 int (*fl_change)(struct file_lock **, int);
669 /* that will die - we need it for nfs_lock_info */
670 #include <linux/nfs_fs_i.h>
673 struct file_lock *fl_next; /* singly linked list for this inode */
674 struct list_head fl_link; /* doubly linked list of all locks */
675 struct list_head fl_block; /* circular list of blocked processes */
678 wait_queue_head_t fl_wait;
679 struct file *fl_file;
680 unsigned char fl_flags;
681 unsigned char fl_type;
686 struct fasync_struct * fl_fasync; /* for lease break notifications */
687 unsigned long fl_break_time; /* for nonblocking lease breaks */
689 struct file_lock_operations *fl_ops; /* Callbacks for filesystems */
690 struct lock_manager_operations *fl_lmops; /* Callbacks for lockmanagers */
692 struct nfs_lock_info nfs_fl;
696 /* The following constant reflects the upper bound of the file/locking space */
698 #define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1)))
699 #define OFFSET_MAX INT_LIMIT(loff_t)
700 #define OFFT_OFFSET_MAX INT_LIMIT(off_t)
703 extern struct list_head file_lock_list;
705 #include <linux/fcntl.h>
707 extern int fcntl_getlk(struct file *, struct flock __user *);
708 extern int fcntl_setlk(struct file *, unsigned int, struct flock __user *);
710 #if BITS_PER_LONG == 32
711 extern int fcntl_getlk64(struct file *, struct flock64 __user *);
712 extern int fcntl_setlk64(struct file *, unsigned int, struct flock64 __user *);
715 extern void send_sigio(struct fown_struct *fown, int fd, int band);
716 extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg);
717 extern int fcntl_getlease(struct file *filp);
720 extern void locks_init_lock(struct file_lock *);
721 extern void locks_copy_lock(struct file_lock *, struct file_lock *);
722 extern void locks_remove_posix(struct file *, fl_owner_t);
723 extern void locks_remove_flock(struct file *);
724 extern struct file_lock *posix_test_lock(struct file *, struct file_lock *);
725 extern int posix_lock_file(struct file *, struct file_lock *);
726 extern int posix_lock_file_wait(struct file *, struct file_lock *);
727 extern void posix_block_lock(struct file_lock *, struct file_lock *);
728 extern void posix_unblock_lock(struct file *, struct file_lock *);
729 extern int posix_locks_deadlock(struct file_lock *, struct file_lock *);
730 extern int flock_lock_file_wait(struct file *filp, struct file_lock *fl);
731 extern int __break_lease(struct inode *inode, unsigned int flags);
732 extern void lease_get_mtime(struct inode *, struct timespec *time);
733 extern int setlease(struct file *, long, struct file_lock **);
734 extern int lease_modify(struct file_lock **, int);
735 extern int lock_may_read(struct inode *, loff_t start, unsigned long count);
736 extern int lock_may_write(struct inode *, loff_t start, unsigned long count);
737 extern void steal_locks(fl_owner_t from);
739 struct fasync_struct {
742 struct fasync_struct *fa_next; /* singly linked list */
743 struct file *fa_file;
746 #define FASYNC_MAGIC 0x4601
748 /* SMP safe fasync helpers: */
749 extern int fasync_helper(int, struct file *, int, struct fasync_struct **);
750 /* can be called from interrupts */
751 extern void kill_fasync(struct fasync_struct **, int, int);
752 /* only for net: no internal synchronization */
753 extern void __kill_fasync(struct fasync_struct *, int, int);
755 extern int f_setown(struct file *filp, unsigned long arg, int force);
756 extern void f_delown(struct file *filp);
757 extern int send_sigurg(struct fown_struct *fown);
763 #define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */
764 #define MNT_DETACH 0x00000002 /* Just detach from the tree */
765 #define MNT_EXPIRE 0x00000004 /* Mark for expiry */
767 extern struct list_head super_blocks;
768 extern spinlock_t sb_lock;
770 #define sb_entry(list) list_entry((list), struct super_block, s_list)
771 #define S_BIAS (1<<30)
773 struct list_head s_list; /* Keep this first */
774 dev_t s_dev; /* search index; _not_ kdev_t */
775 unsigned long s_blocksize;
776 unsigned long s_old_blocksize;
777 unsigned char s_blocksize_bits;
778 unsigned char s_dirt;
779 unsigned long long s_maxbytes; /* Max file size */
780 struct file_system_type *s_type;
781 struct super_operations *s_op;
782 struct dquot_operations *dq_op;
783 struct quotactl_ops *s_qcop;
784 struct export_operations *s_export_op;
785 unsigned long s_flags;
786 unsigned long s_magic;
787 struct dentry *s_root;
788 struct rw_semaphore s_umount;
789 struct semaphore s_lock;
795 struct xattr_handler **s_xattr;
797 struct list_head s_inodes; /* all inodes */
798 struct list_head s_dirty; /* dirty inodes */
799 struct list_head s_io; /* parked for writeback */
800 struct hlist_head s_anon; /* anonymous dentries for (nfs) exporting */
801 struct list_head s_files;
803 struct block_device *s_bdev;
804 struct list_head s_instances;
805 struct quota_info s_dquot; /* Diskquota specific options */
808 wait_queue_head_t s_wait_unfrozen;
810 char s_id[32]; /* Informational name */
812 void *s_fs_info; /* Filesystem private info */
815 * The next field is for VFS *only*. No filesystems have any business
816 * even looking at it. You had been warned.
818 struct semaphore s_vfs_rename_sem; /* Kludge */
820 /* Granuality of c/m/atime in ns.
821 Cannot be worse than a second */
825 extern struct timespec current_fs_time(struct super_block *sb);
828 * Snapshotting support.
836 #define vfs_check_frozen(sb, level) \
837 wait_event((sb)->s_wait_unfrozen, ((sb)->s_frozen < (level)))
840 * Superblock locking.
842 static inline void lock_super(struct super_block * sb)
847 static inline void unlock_super(struct super_block * sb)
853 * VFS helper functions..
855 extern int vfs_create(struct inode *, struct dentry *, int, struct nameidata *);
856 extern int vfs_mkdir(struct inode *, struct dentry *, int);
857 extern int vfs_mknod(struct inode *, struct dentry *, int, dev_t);
858 extern int vfs_symlink(struct inode *, struct dentry *, const char *, int);
859 extern int vfs_link(struct dentry *, struct inode *, struct dentry *);
860 extern int vfs_rmdir(struct inode *, struct dentry *);
861 extern int vfs_unlink(struct inode *, struct dentry *);
862 extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
865 * VFS dentry helper functions.
867 extern void dentry_unhash(struct dentry *dentry);
872 * NOTE! These match bits 12..15 of stat.st_mode
873 * (ie "(i_mode >> 12) & 15").
885 #define OSYNC_METADATA (1<<0)
886 #define OSYNC_DATA (1<<1)
887 #define OSYNC_INODE (1<<2)
888 int generic_osync_inode(struct inode *, struct address_space *, int);
891 * This is the "filldir" function type, used by readdir() to let
892 * the kernel specify what kind of dirent layout it wants to have.
893 * This allows the kernel to read directories into kernel space or
894 * to have different dirent layouts depending on the binary type.
896 typedef int (*filldir_t)(void *, const char *, int, loff_t, ino_t, unsigned);
898 struct block_device_operations {
899 int (*open) (struct inode *, struct file *);
900 int (*release) (struct inode *, struct file *);
901 int (*ioctl) (struct inode *, struct file *, unsigned, unsigned long);
902 long (*compat_ioctl) (struct file *, unsigned, unsigned long);
903 int (*media_changed) (struct gendisk *);
904 int (*revalidate_disk) (struct gendisk *);
905 struct module *owner;
909 * "descriptor" for what we're up to with a read for sendfile().
910 * This allows us to use the same read code yet
911 * have multiple different users of the data that
912 * we read from a file.
914 * The simplest case just copies the data to user
927 typedef int (*read_actor_t)(read_descriptor_t *, struct page *, unsigned long, unsigned long);
929 /* These macros are for out of kernel modules to test that
930 * the kernel supports the unlocked_ioctl and compat_ioctl
931 * fields in struct file_operations. */
932 #define HAVE_COMPAT_IOCTL 1
933 #define HAVE_UNLOCKED_IOCTL 1
937 * read, write, poll, fsync, readv, writev, unlocked_ioctl and compat_ioctl
938 * can be called without the big kernel lock held in all filesystems.
940 struct file_operations {
941 struct module *owner;
942 loff_t (*llseek) (struct file *, loff_t, int);
943 ssize_t (*read) (struct file *, char __user *, size_t, loff_t *);
944 ssize_t (*aio_read) (struct kiocb *, char __user *, size_t, loff_t);
945 ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *);
946 ssize_t (*aio_write) (struct kiocb *, const char __user *, size_t, loff_t);
947 int (*readdir) (struct file *, void *, filldir_t);
948 unsigned int (*poll) (struct file *, struct poll_table_struct *);
949 int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long);
950 long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);
951 long (*compat_ioctl) (struct file *, unsigned int, unsigned long);
952 int (*mmap) (struct file *, struct vm_area_struct *);
953 int (*open) (struct inode *, struct file *);
954 int (*flush) (struct file *);
955 int (*release) (struct inode *, struct file *);
956 int (*fsync) (struct file *, struct dentry *, int datasync);
957 int (*aio_fsync) (struct kiocb *, int datasync);
958 int (*fasync) (int, struct file *, int);
959 int (*lock) (struct file *, int, struct file_lock *);
960 ssize_t (*readv) (struct file *, const struct iovec *, unsigned long, loff_t *);
961 ssize_t (*writev) (struct file *, const struct iovec *, unsigned long, loff_t *);
962 ssize_t (*sendfile) (struct file *, loff_t *, size_t, read_actor_t, void *);
963 ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int);
964 unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
965 int (*check_flags)(int);
966 int (*dir_notify)(struct file *filp, unsigned long arg);
967 int (*flock) (struct file *, int, struct file_lock *);
970 struct inode_operations {
971 int (*create) (struct inode *,struct dentry *,int, struct nameidata *);
972 struct dentry * (*lookup) (struct inode *,struct dentry *, struct nameidata *);
973 int (*link) (struct dentry *,struct inode *,struct dentry *);
974 int (*unlink) (struct inode *,struct dentry *);
975 int (*symlink) (struct inode *,struct dentry *,const char *);
976 int (*mkdir) (struct inode *,struct dentry *,int);
977 int (*rmdir) (struct inode *,struct dentry *);
978 int (*mknod) (struct inode *,struct dentry *,int,dev_t);
979 int (*rename) (struct inode *, struct dentry *,
980 struct inode *, struct dentry *);
981 int (*readlink) (struct dentry *, char __user *,int);
982 int (*follow_link) (struct dentry *, struct nameidata *);
983 void (*put_link) (struct dentry *, struct nameidata *);
984 void (*truncate) (struct inode *);
985 int (*permission) (struct inode *, int, struct nameidata *);
986 int (*setattr) (struct dentry *, struct iattr *);
987 int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *);
988 int (*setxattr) (struct dentry *, const char *,const void *,size_t,int);
989 ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t);
990 ssize_t (*listxattr) (struct dentry *, char *, size_t);
991 int (*removexattr) (struct dentry *, const char *);
996 extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *);
997 extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *);
998 extern ssize_t vfs_readv(struct file *, const struct iovec __user *,
999 unsigned long, loff_t *);
1000 extern ssize_t vfs_writev(struct file *, const struct iovec __user *,
1001 unsigned long, loff_t *);
1004 * NOTE: write_inode, delete_inode, clear_inode, put_inode can be called
1005 * without the big kernel lock held in all filesystems.
1007 struct super_operations {
1008 struct inode *(*alloc_inode)(struct super_block *sb);
1009 void (*destroy_inode)(struct inode *);
1011 void (*read_inode) (struct inode *);
1013 void (*dirty_inode) (struct inode *);
1014 int (*write_inode) (struct inode *, int);
1015 void (*put_inode) (struct inode *);
1016 void (*drop_inode) (struct inode *);
1017 void (*delete_inode) (struct inode *);
1018 void (*put_super) (struct super_block *);
1019 void (*write_super) (struct super_block *);
1020 int (*sync_fs)(struct super_block *sb, int wait);
1021 void (*write_super_lockfs) (struct super_block *);
1022 void (*unlockfs) (struct super_block *);
1023 int (*statfs) (struct super_block *, struct kstatfs *);
1024 int (*remount_fs) (struct super_block *, int *, char *);
1025 void (*clear_inode) (struct inode *);
1026 void (*umount_begin) (struct super_block *);
1028 int (*show_options)(struct seq_file *, struct vfsmount *);
1030 ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t);
1031 ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t);
1034 /* Inode state bits. Protected by inode_lock. */
1035 #define I_DIRTY_SYNC 1 /* Not dirty enough for O_DATASYNC */
1036 #define I_DIRTY_DATASYNC 2 /* Data-related inode changes pending */
1037 #define I_DIRTY_PAGES 4 /* Data-related inode changes pending */
1039 #define I_LOCK (1 << __I_LOCK)
1040 #define I_FREEING 16
1044 #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)
1046 extern void __mark_inode_dirty(struct inode *, int);
1047 static inline void mark_inode_dirty(struct inode *inode)
1049 __mark_inode_dirty(inode, I_DIRTY);
1052 static inline void mark_inode_dirty_sync(struct inode *inode)
1054 __mark_inode_dirty(inode, I_DIRTY_SYNC);
1057 static inline void touch_atime(struct vfsmount *mnt, struct dentry *dentry)
1059 struct inode *inode = dentry->d_inode;
1061 if (MNT_IS_NOATIME(mnt))
1063 if (S_ISDIR(inode->i_mode) && MNT_IS_NODIRATIME(mnt))
1065 if (IS_RDONLY(inode) || MNT_IS_RDONLY(mnt))
1068 update_atime(inode);
1071 static inline void file_accessed(struct file *file)
1073 if (!(file->f_flags & O_NOATIME))
1074 touch_atime(file->f_vfsmnt, file->f_dentry);
1077 int sync_inode(struct inode *inode, struct writeback_control *wbc);
1080 * struct export_operations - for nfsd to communicate with file systems
1081 * @decode_fh: decode a file handle fragment and return a &struct dentry
1082 * @encode_fh: encode a file handle fragment from a dentry
1083 * @get_name: find the name for a given inode in a given directory
1084 * @get_parent: find the parent of a given directory
1085 * @get_dentry: find a dentry for the inode given a file handle sub-fragment
1088 * The export_operations structure provides a means for nfsd to communicate
1089 * with a particular exported file system - particularly enabling nfsd and
1090 * the filesystem to co-operate when dealing with file handles.
1092 * export_operations contains two basic operation for dealing with file
1093 * handles, decode_fh() and encode_fh(), and allows for some other
1094 * operations to be defined which standard helper routines use to get
1095 * specific information from the filesystem.
1097 * nfsd encodes information use to determine which filesystem a filehandle
1098 * applies to in the initial part of the file handle. The remainder, termed
1099 * a file handle fragment, is controlled completely by the filesystem. The
1100 * standard helper routines assume that this fragment will contain one or
1101 * two sub-fragments, one which identifies the file, and one which may be
1102 * used to identify the (a) directory containing the file.
1104 * In some situations, nfsd needs to get a dentry which is connected into a
1105 * specific part of the file tree. To allow for this, it passes the
1106 * function acceptable() together with a @context which can be used to see
1107 * if the dentry is acceptable. As there can be multiple dentrys for a
1108 * given file, the filesystem should check each one for acceptability before
1109 * looking for the next. As soon as an acceptable one is found, it should
1113 * @decode_fh is given a &struct super_block (@sb), a file handle fragment
1114 * (@fh, @fh_len) and an acceptability testing function (@acceptable,
1115 * @context). It should return a &struct dentry which refers to the same
1116 * file that the file handle fragment refers to, and which passes the
1117 * acceptability test. If it cannot, it should return a %NULL pointer if
1118 * the file was found but no acceptable &dentries were available, or a
1119 * %ERR_PTR error code indicating why it couldn't be found (e.g. %ENOENT or
1123 * @encode_fh should store in the file handle fragment @fh (using at most
1124 * @max_len bytes) information that can be used by @decode_fh to recover the
1125 * file refered to by the &struct dentry @de. If the @connectable flag is
1126 * set, the encode_fh() should store sufficient information so that a good
1127 * attempt can be made to find not only the file but also it's place in the
1128 * filesystem. This typically means storing a reference to de->d_parent in
1129 * the filehandle fragment. encode_fh() should return the number of bytes
1130 * stored or a negative error code such as %-ENOSPC
1133 * @get_name should find a name for the given @child in the given @parent
1134 * directory. The name should be stored in the @name (with the
1135 * understanding that it is already pointing to a a %NAME_MAX+1 sized
1136 * buffer. get_name() should return %0 on success, a negative error code
1137 * or error. @get_name will be called without @parent->i_sem held.
1140 * @get_parent should find the parent directory for the given @child which
1141 * is also a directory. In the event that it cannot be found, or storage
1142 * space cannot be allocated, a %ERR_PTR should be returned.
1145 * Given a &super_block (@sb) and a pointer to a file-system specific inode
1146 * identifier, possibly an inode number, (@inump) get_dentry() should find
1147 * the identified inode and return a dentry for that inode. Any suitable
1148 * dentry can be returned including, if necessary, a new dentry created with
1149 * d_alloc_root. The caller can then find any other extant dentrys by
1150 * following the d_alias links. If a new dentry was created using
1151 * d_alloc_root, DCACHE_NFSD_DISCONNECTED should be set, and the dentry
1152 * should be d_rehash()ed.
1154 * If the inode cannot be found, either a %NULL pointer or an %ERR_PTR code
1155 * can be returned. The @inump will be whatever was passed to
1156 * nfsd_find_fh_dentry() in either the @obj or @parent parameters.
1159 * get_parent is called with child->d_inode->i_sem down
1160 * get_name is not (which is possibly inconsistent)
1163 struct export_operations {
1164 struct dentry *(*decode_fh)(struct super_block *sb, __u32 *fh, int fh_len, int fh_type,
1165 int (*acceptable)(void *context, struct dentry *de),
1167 int (*encode_fh)(struct dentry *de, __u32 *fh, int *max_len,
1170 /* the following are only called from the filesystem itself */
1171 int (*get_name)(struct dentry *parent, char *name,
1172 struct dentry *child);
1173 struct dentry * (*get_parent)(struct dentry *child);
1174 struct dentry * (*get_dentry)(struct super_block *sb, void *inump);
1176 /* This is set by the exporting module to a standard helper */
1177 struct dentry * (*find_exported_dentry)(
1178 struct super_block *sb, void *obj, void *parent,
1179 int (*acceptable)(void *context, struct dentry *de),
1185 extern struct dentry *
1186 find_exported_dentry(struct super_block *sb, void *obj, void *parent,
1187 int (*acceptable)(void *context, struct dentry *de),
1190 struct file_system_type {
1193 struct super_block *(*get_sb) (struct file_system_type *, int,
1194 const char *, void *);
1195 void (*kill_sb) (struct super_block *);
1196 struct module *owner;
1197 struct file_system_type * next;
1198 struct list_head fs_supers;
1201 struct super_block *get_sb_bdev(struct file_system_type *fs_type,
1202 int flags, const char *dev_name, void *data,
1203 int (*fill_super)(struct super_block *, void *, int));
1204 struct super_block *get_sb_single(struct file_system_type *fs_type,
1205 int flags, void *data,
1206 int (*fill_super)(struct super_block *, void *, int));
1207 struct super_block *get_sb_nodev(struct file_system_type *fs_type,
1208 int flags, void *data,
1209 int (*fill_super)(struct super_block *, void *, int));
1210 void generic_shutdown_super(struct super_block *sb);
1211 void kill_block_super(struct super_block *sb);
1212 void kill_anon_super(struct super_block *sb);
1213 void kill_litter_super(struct super_block *sb);
1214 void deactivate_super(struct super_block *sb);
1215 int set_anon_super(struct super_block *s, void *data);
1216 struct super_block *sget(struct file_system_type *type,
1217 int (*test)(struct super_block *,void *),
1218 int (*set)(struct super_block *,void *),
1220 struct super_block *get_sb_pseudo(struct file_system_type *, char *,
1221 struct super_operations *ops, unsigned long);
1222 int __put_super(struct super_block *sb);
1223 int __put_super_and_need_restart(struct super_block *sb);
1224 void unnamed_dev_init(void);
1226 /* Alas, no aliases. Too much hassle with bringing module.h everywhere */
1227 #define fops_get(fops) \
1228 (((fops) && try_module_get((fops)->owner) ? (fops) : NULL))
1229 #define fops_put(fops) \
1230 do { if (fops) module_put((fops)->owner); } while(0)
1232 extern int register_filesystem(struct file_system_type *);
1233 extern int unregister_filesystem(struct file_system_type *);
1234 extern struct vfsmount *kern_mount(struct file_system_type *);
1235 extern int may_umount_tree(struct vfsmount *);
1236 extern int may_umount(struct vfsmount *);
1237 extern long do_mount(char *, char *, char *, unsigned long, void *);
1239 extern int vfs_statfs(struct super_block *, struct kstatfs *);
1241 #define FLOCK_VERIFY_READ 1
1242 #define FLOCK_VERIFY_WRITE 2
1244 extern int locks_mandatory_locked(struct inode *);
1245 extern int locks_mandatory_area(int, struct inode *, struct file *, loff_t, size_t);
1248 * Candidates for mandatory locking have the setgid bit set
1249 * but no group execute bit - an otherwise meaningless combination.
1251 #define MANDATORY_LOCK(inode) \
1252 (IS_MANDLOCK(inode) && ((inode)->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
1254 static inline int locks_verify_locked(struct inode *inode)
1256 if (MANDATORY_LOCK(inode))
1257 return locks_mandatory_locked(inode);
1261 extern int rw_verify_area(int, struct file *, loff_t *, size_t);
1263 static inline int locks_verify_truncate(struct inode *inode,
1267 if (inode->i_flock && MANDATORY_LOCK(inode))
1268 return locks_mandatory_area(
1269 FLOCK_VERIFY_WRITE, inode, filp,
1270 size < inode->i_size ? size : inode->i_size,
1271 (size < inode->i_size ? inode->i_size - size
1272 : size - inode->i_size)
1277 static inline int break_lease(struct inode *inode, unsigned int mode)
1280 return __break_lease(inode, mode);
1286 extern int do_truncate(struct dentry *, loff_t start);
1287 extern struct file *filp_open(const char *, int, int);
1288 extern struct file * dentry_open(struct dentry *, struct vfsmount *, int);
1289 extern int filp_close(struct file *, fl_owner_t id);
1290 extern char * getname(const char __user *);
1293 extern void __init vfs_caches_init_early(void);
1294 extern void __init vfs_caches_init(unsigned long);
1296 #define __getname() kmem_cache_alloc(names_cachep, SLAB_KERNEL)
1297 #define __putname(name) kmem_cache_free(names_cachep, (void *)(name))
1298 #ifndef CONFIG_AUDITSYSCALL
1299 #define putname(name) __putname(name)
1301 extern void putname(const char *name);
1304 extern int register_blkdev(unsigned int, const char *);
1305 extern int unregister_blkdev(unsigned int, const char *);
1306 extern struct block_device *bdget(dev_t);
1307 extern void bd_set_size(struct block_device *, loff_t size);
1308 extern void bd_forget(struct inode *inode);
1309 extern void bdput(struct block_device *);
1310 extern struct block_device *open_by_devnum(dev_t, unsigned);
1311 extern struct file_operations def_blk_fops;
1312 extern struct address_space_operations def_blk_aops;
1313 extern struct file_operations def_chr_fops;
1314 extern struct file_operations bad_sock_fops;
1315 extern struct file_operations def_fifo_fops;
1316 extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long);
1317 extern int blkdev_ioctl(struct inode *, struct file *, unsigned, unsigned long);
1318 extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long);
1319 extern int blkdev_get(struct block_device *, mode_t, unsigned);
1320 extern int blkdev_put(struct block_device *);
1321 extern int bd_claim(struct block_device *, void *);
1322 extern void bd_release(struct block_device *);
1325 extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *);
1326 extern int register_chrdev_region(dev_t, unsigned, const char *);
1327 extern int register_chrdev(unsigned int, const char *,
1328 struct file_operations *);
1329 extern int unregister_chrdev(unsigned int, const char *);
1330 extern void unregister_chrdev_region(dev_t, unsigned);
1331 extern int chrdev_open(struct inode *, struct file *);
1333 /* fs/block_dev.c */
1334 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
1335 extern const char *__bdevname(dev_t, char *buffer);
1336 extern const char *bdevname(struct block_device *bdev, char *buffer);
1337 extern struct block_device *lookup_bdev(const char *);
1338 extern struct block_device *open_bdev_excl(const char *, int, void *);
1339 extern void close_bdev_excl(struct block_device *);
1341 extern void init_special_inode(struct inode *, umode_t, dev_t);
1343 /* Invalid inode operations -- fs/bad_inode.c */
1344 extern void make_bad_inode(struct inode *);
1345 extern int is_bad_inode(struct inode *);
1347 extern struct file_operations read_fifo_fops;
1348 extern struct file_operations write_fifo_fops;
1349 extern struct file_operations rdwr_fifo_fops;
1350 extern struct file_operations read_pipe_fops;
1351 extern struct file_operations write_pipe_fops;
1352 extern struct file_operations rdwr_pipe_fops;
1354 extern int fs_may_remount_ro(struct super_block *);
1357 * return READ, READA, or WRITE
1359 #define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK))
1362 * return data direction, READ or WRITE
1364 #define bio_data_dir(bio) ((bio)->bi_rw & 1)
1366 extern int check_disk_change(struct block_device *);
1367 extern int invalidate_inodes(struct super_block *);
1368 extern int __invalidate_device(struct block_device *);
1369 extern int invalidate_partition(struct gendisk *, int);
1370 unsigned long invalidate_mapping_pages(struct address_space *mapping,
1371 pgoff_t start, pgoff_t end);
1372 unsigned long invalidate_inode_pages(struct address_space *mapping);
1373 static inline void invalidate_remote_inode(struct inode *inode)
1375 if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1376 S_ISLNK(inode->i_mode))
1377 invalidate_inode_pages(inode->i_mapping);
1379 extern int invalidate_inode_pages2(struct address_space *mapping);
1380 extern int invalidate_inode_pages2_range(struct address_space *mapping,
1381 pgoff_t start, pgoff_t end);
1382 extern int write_inode_now(struct inode *, int);
1383 extern int filemap_fdatawrite(struct address_space *);
1384 extern int filemap_flush(struct address_space *);
1385 extern int filemap_fdatawait(struct address_space *);
1386 extern int filemap_write_and_wait(struct address_space *mapping);
1387 extern int filemap_write_and_wait_range(struct address_space *mapping,
1388 loff_t lstart, loff_t lend);
1389 extern void sync_supers(void);
1390 extern void sync_filesystems(int wait);
1391 extern void emergency_sync(void);
1392 extern void emergency_remount(void);
1393 extern int do_remount_sb(struct super_block *sb, int flags,
1394 void *data, int force);
1395 extern sector_t bmap(struct inode *, sector_t);
1396 extern int setattr_mask(unsigned int);
1397 extern int notify_change(struct dentry *, struct iattr *);
1398 extern int permission(struct inode *, int, struct nameidata *);
1399 extern int generic_permission(struct inode *, int,
1400 int (*check_acl)(struct inode *, int));
1402 extern int get_write_access(struct inode *);
1403 extern int deny_write_access(struct file *);
1404 static inline void put_write_access(struct inode * inode)
1406 atomic_dec(&inode->i_writecount);
1408 static inline void allow_write_access(struct file *file)
1411 atomic_inc(&file->f_dentry->d_inode->i_writecount);
1413 extern int do_pipe(int *);
1415 extern int open_namei(const char *, int, int, struct nameidata *);
1416 extern int may_open(struct nameidata *, int, int);
1418 extern int kernel_read(struct file *, unsigned long, char *, unsigned long);
1419 extern struct file * open_exec(const char *);
1421 /* fs/dcache.c -- generic fs support functions */
1422 extern int is_subdir(struct dentry *, struct dentry *);
1423 extern ino_t find_inode_number(struct dentry *, struct qstr *);
1425 #include <linux/err.h>
1427 /* needed for stackable file system support */
1428 extern loff_t default_llseek(struct file *file, loff_t offset, int origin);
1430 extern loff_t vfs_llseek(struct file *file, loff_t offset, int origin);
1432 extern void inode_init_once(struct inode *);
1433 extern void iput(struct inode *);
1434 extern struct inode * igrab(struct inode *);
1435 extern ino_t iunique(struct super_block *, ino_t);
1436 extern int inode_needs_sync(struct inode *inode);
1437 extern void generic_delete_inode(struct inode *inode);
1439 extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval,
1440 int (*test)(struct inode *, void *), void *data);
1441 extern struct inode *ilookup(struct super_block *sb, unsigned long ino);
1443 extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *);
1444 extern struct inode * iget_locked(struct super_block *, unsigned long);
1445 extern void unlock_new_inode(struct inode *);
1447 static inline struct inode *iget(struct super_block *sb, unsigned long ino)
1449 struct inode *inode = iget_locked(sb, ino);
1451 if (inode && (inode->i_state & I_NEW)) {
1452 sb->s_op->read_inode(inode);
1453 unlock_new_inode(inode);
1459 extern void __iget(struct inode * inode);
1460 extern void clear_inode(struct inode *);
1461 extern void destroy_inode(struct inode *);
1462 extern struct inode *new_inode(struct super_block *);
1463 extern int remove_suid(struct dentry *);
1464 extern void remove_dquot_ref(struct super_block *, int, struct list_head *);
1465 extern struct semaphore iprune_sem;
1467 extern void __insert_inode_hash(struct inode *, unsigned long hashval);
1468 extern void remove_inode_hash(struct inode *);
1469 static inline void insert_inode_hash(struct inode *inode) {
1470 __insert_inode_hash(inode, inode->i_ino);
1473 extern struct file * get_empty_filp(void);
1474 extern void file_move(struct file *f, struct list_head *list);
1475 extern void file_kill(struct file *f);
1477 extern void submit_bio(int, struct bio *);
1478 extern int bdev_read_only(struct block_device *);
1479 extern int set_blocksize(struct block_device *, int);
1480 extern int sb_set_blocksize(struct super_block *, int);
1481 extern int sb_min_blocksize(struct super_block *, int);
1483 extern int generic_file_mmap(struct file *, struct vm_area_struct *);
1484 extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *);
1485 extern int file_read_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size);
1486 extern int file_send_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size);
1487 extern ssize_t generic_file_read(struct file *, char __user *, size_t, loff_t *);
1488 int generic_write_checks(struct file *file, loff_t *pos, size_t *count, int isblk);
1489 extern ssize_t generic_file_write(struct file *, const char __user *, size_t, loff_t *);
1490 extern ssize_t generic_file_aio_read(struct kiocb *, char __user *, size_t, loff_t);
1491 extern ssize_t __generic_file_aio_read(struct kiocb *, const struct iovec *, unsigned long, loff_t *);
1492 extern ssize_t generic_file_aio_write(struct kiocb *, const char __user *, size_t, loff_t);
1493 extern ssize_t generic_file_aio_write_nolock(struct kiocb *, const struct iovec *,
1494 unsigned long, loff_t *);
1495 extern ssize_t generic_file_direct_write(struct kiocb *, const struct iovec *,
1496 unsigned long *, loff_t, loff_t *, size_t, size_t);
1497 extern ssize_t generic_file_buffered_write(struct kiocb *, const struct iovec *,
1498 unsigned long, loff_t, loff_t *, size_t, ssize_t);
1499 extern ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos);
1500 extern ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos);
1501 ssize_t generic_file_write_nolock(struct file *file, const struct iovec *iov,
1502 unsigned long nr_segs, loff_t *ppos);
1503 extern ssize_t generic_file_sendfile(struct file *, loff_t *, size_t, read_actor_t, void *);
1504 extern void do_generic_mapping_read(struct address_space *mapping,
1505 struct file_ra_state *, struct file *,
1506 loff_t *, read_descriptor_t *, read_actor_t, int);
1508 file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping);
1509 extern ssize_t generic_file_direct_IO(int rw, struct kiocb *iocb,
1510 const struct iovec *iov, loff_t offset, unsigned long nr_segs);
1511 extern ssize_t generic_file_readv(struct file *filp, const struct iovec *iov,
1512 unsigned long nr_segs, loff_t *ppos);
1513 ssize_t generic_file_writev(struct file *filp, const struct iovec *iov,
1514 unsigned long nr_segs, loff_t *ppos);
1515 extern loff_t no_llseek(struct file *file, loff_t offset, int origin);
1516 extern loff_t generic_file_llseek(struct file *file, loff_t offset, int origin);
1517 extern loff_t remote_llseek(struct file *file, loff_t offset, int origin);
1518 extern int generic_file_open(struct inode * inode, struct file * filp);
1519 extern int nonseekable_open(struct inode * inode, struct file * filp);
1521 static inline void do_generic_file_read(struct file * filp, loff_t *ppos,
1522 read_descriptor_t * desc,
1523 read_actor_t actor, int nonblock)
1525 do_generic_mapping_read(filp->f_mapping,
1534 ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
1535 struct block_device *bdev, const struct iovec *iov, loff_t offset,
1536 unsigned long nr_segs, get_blocks_t get_blocks, dio_iodone_t end_io,
1540 DIO_LOCKING = 1, /* need locking between buffered and direct access */
1541 DIO_NO_LOCKING, /* bdev; no locking at all between buffered/direct */
1542 DIO_OWN_LOCKING, /* filesystem locks buffered and direct internally */
1545 static inline ssize_t blockdev_direct_IO(int rw, struct kiocb *iocb,
1546 struct inode *inode, struct block_device *bdev, const struct iovec *iov,
1547 loff_t offset, unsigned long nr_segs, get_blocks_t get_blocks,
1548 dio_iodone_t end_io)
1550 return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
1551 nr_segs, get_blocks, end_io, DIO_LOCKING);
1554 static inline ssize_t blockdev_direct_IO_no_locking(int rw, struct kiocb *iocb,
1555 struct inode *inode, struct block_device *bdev, const struct iovec *iov,
1556 loff_t offset, unsigned long nr_segs, get_blocks_t get_blocks,
1557 dio_iodone_t end_io)
1559 return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
1560 nr_segs, get_blocks, end_io, DIO_NO_LOCKING);
1563 static inline ssize_t blockdev_direct_IO_own_locking(int rw, struct kiocb *iocb,
1564 struct inode *inode, struct block_device *bdev, const struct iovec *iov,
1565 loff_t offset, unsigned long nr_segs, get_blocks_t get_blocks,
1566 dio_iodone_t end_io)
1568 return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
1569 nr_segs, get_blocks, end_io, DIO_OWN_LOCKING);
1572 extern struct file_operations generic_ro_fops;
1574 #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))
1576 extern int vfs_readlink(struct dentry *, char __user *, int, const char *);
1577 extern int vfs_follow_link(struct nameidata *, const char *);
1578 extern int page_readlink(struct dentry *, char __user *, int);
1579 extern int page_follow_link_light(struct dentry *, struct nameidata *);
1580 extern void page_put_link(struct dentry *, struct nameidata *);
1581 extern int page_symlink(struct inode *inode, const char *symname, int len);
1582 extern struct inode_operations page_symlink_inode_operations;
1583 extern int generic_readlink(struct dentry *, char __user *, int);
1584 extern void generic_fillattr(struct inode *, struct kstat *);
1585 extern int vfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
1586 void inode_add_bytes(struct inode *inode, loff_t bytes);
1587 void inode_sub_bytes(struct inode *inode, loff_t bytes);
1588 loff_t inode_get_bytes(struct inode *inode);
1589 void inode_set_bytes(struct inode *inode, loff_t bytes);
1591 extern int vfs_readdir(struct file *, filldir_t, void *);
1593 extern int vfs_stat(char __user *, struct kstat *);
1594 extern int vfs_lstat(char __user *, struct kstat *);
1595 extern int vfs_fstat(unsigned int, struct kstat *);
1597 extern int vfs_ioctl(struct file *, unsigned int, unsigned int, unsigned long);
1599 extern struct file_system_type *get_fs_type(const char *name);
1600 extern struct super_block *get_super(struct block_device *);
1601 extern struct super_block *user_get_super(dev_t);
1602 extern void drop_super(struct super_block *sb);
1604 extern int dcache_dir_open(struct inode *, struct file *);
1605 extern int dcache_dir_close(struct inode *, struct file *);
1606 extern loff_t dcache_dir_lseek(struct file *, loff_t, int);
1607 extern int dcache_readdir(struct file *, void *, filldir_t);
1608 extern int dcache_readdir_filter(struct file *, void *, filldir_t, int (*)(struct dentry *));
1609 extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *);
1610 extern int simple_statfs(struct super_block *, struct kstatfs *);
1611 extern int simple_link(struct dentry *, struct inode *, struct dentry *);
1612 extern int simple_unlink(struct inode *, struct dentry *);
1613 extern int simple_rmdir(struct inode *, struct dentry *);
1614 extern int simple_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
1615 extern int simple_sync_file(struct file *, struct dentry *, int);
1616 extern int simple_empty(struct dentry *);
1617 extern int simple_readpage(struct file *file, struct page *page);
1618 extern int simple_prepare_write(struct file *file, struct page *page,
1619 unsigned offset, unsigned to);
1620 extern int simple_commit_write(struct file *file, struct page *page,
1621 unsigned offset, unsigned to);
1623 extern struct dentry *simple_lookup(struct inode *, struct dentry *, struct nameidata *);
1624 extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *);
1625 extern struct file_operations simple_dir_operations;
1626 extern struct inode_operations simple_dir_inode_operations;
1627 struct tree_descr { char *name; struct file_operations *ops; int mode; };
1628 struct dentry *d_alloc_name(struct dentry *, const char *);
1629 extern int simple_fill_super(struct super_block *, int, struct tree_descr *);
1630 extern int simple_pin_fs(char *name, struct vfsmount **mount, int *count);
1631 extern void simple_release_fs(struct vfsmount **mount, int *count);
1633 extern ssize_t simple_read_from_buffer(void __user *, size_t, loff_t *, const void *, size_t);
1635 extern int inode_change_ok(struct inode *, struct iattr *);
1636 extern int __must_check inode_setattr(struct inode *, struct iattr *);
1638 extern void inode_update_time(struct inode *inode, struct vfsmount *mnt, int ctime_too);
1640 static inline ino_t parent_ino(struct dentry *dentry)
1644 spin_lock(&dentry->d_lock);
1645 res = dentry->d_parent->d_inode->i_ino;
1646 spin_unlock(&dentry->d_lock);
1651 extern int unshare_files(void);
1653 /* Transaction based IO helpers */
1656 * An argresp is stored in an allocated page and holds the
1657 * size of the argument or response, along with its content
1659 struct simple_transaction_argresp {
1664 #define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp))
1666 char *simple_transaction_get(struct file *file, const char __user *buf,
1668 ssize_t simple_transaction_read(struct file *file, char __user *buf,
1669 size_t size, loff_t *pos);
1670 int simple_transaction_release(struct inode *inode, struct file *file);
1672 static inline void simple_transaction_set(struct file *file, size_t n)
1674 struct simple_transaction_argresp *ar = file->private_data;
1676 BUG_ON(n > SIMPLE_TRANSACTION_LIMIT);
1679 * The barrier ensures that ar->size will really remain zero until
1680 * ar->data is ready for reading.
1686 #ifdef CONFIG_SECURITY
1687 static inline char *alloc_secdata(void)
1689 return (char *)get_zeroed_page(GFP_KERNEL);
1692 static inline void free_secdata(void *secdata)
1694 free_page((unsigned long)secdata);
1697 static inline char *alloc_secdata(void)
1702 static inline void free_secdata(void *secdata)
1704 #endif /* CONFIG_SECURITY */
1705 #endif /* __KERNEL__ */
1706 #endif /* _LINUX_FS_H */