fs.h 86.6 KB
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#ifndef _LINUX_FS_H
#define _LINUX_FS_H

/*
 * This file has definitions for some important file table
 * structures etc.
 */

#include <linux/limits.h>
#include <linux/ioctl.h>
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#include <linux/blk_types.h>
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#include <linux/types.h>
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/*
 * It's silly to have NR_OPEN bigger than NR_FILE, but you can change
 * the file limit at runtime and only root can increase the per-process
 * nr_file rlimit, so it's safe to set up a ridiculously high absolute
 * upper limit on files-per-process.
 *
 * Some programs (notably those using select()) may have to be 
 * recompiled to take full advantage of the new limits..  
 */

/* Fixed constants first: */
#undef NR_OPEN
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#define INR_OPEN_CUR 1024	/* Initial setting for nfile rlimits */
#define INR_OPEN_MAX 4096	/* Hard limit for nfile rlimits */
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#define BLOCK_SIZE_BITS 10
#define BLOCK_SIZE (1<<BLOCK_SIZE_BITS)

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#define SEEK_SET	0	/* seek relative to beginning of file */
#define SEEK_CUR	1	/* seek relative to current file position */
#define SEEK_END	2	/* seek relative to end of file */
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#define SEEK_MAX	SEEK_END
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struct fstrim_range {
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	__u64 start;
	__u64 len;
	__u64 minlen;
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};

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/* And dynamically-tunable limits and defaults: */
struct files_stat_struct {
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	unsigned long nr_files;		/* read only */
	unsigned long nr_free_files;	/* read only */
	unsigned long max_files;		/* tunable */
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};

struct inodes_stat_t {
	int nr_inodes;
	int nr_unused;
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	int dummy[5];		/* padding for sysctl ABI compatibility */
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};


#define NR_FILE  8192	/* this can well be larger on a larger system */

#define MAY_EXEC 1
#define MAY_WRITE 2
#define MAY_READ 4
#define MAY_APPEND 8
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#define MAY_ACCESS 16
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#define MAY_OPEN 32
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#define MAY_CHDIR 64
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/*
 * flags in file.f_mode.  Note that FMODE_READ and FMODE_WRITE must correspond
 * to O_WRONLY and O_RDWR via the strange trick in __dentry_open()
 */

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/* file is open for reading */
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#define FMODE_READ		((__force fmode_t)0x1)
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/* file is open for writing */
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#define FMODE_WRITE		((__force fmode_t)0x2)
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/* file is seekable */
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#define FMODE_LSEEK		((__force fmode_t)0x4)
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/* file can be accessed using pread */
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#define FMODE_PREAD		((__force fmode_t)0x8)
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/* file can be accessed using pwrite */
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#define FMODE_PWRITE		((__force fmode_t)0x10)
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/* File is opened for execution with sys_execve / sys_uselib */
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#define FMODE_EXEC		((__force fmode_t)0x20)
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/* File is opened with O_NDELAY (only set for block devices) */
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#define FMODE_NDELAY		((__force fmode_t)0x40)
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/* File is opened with O_EXCL (only set for block devices) */
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#define FMODE_EXCL		((__force fmode_t)0x80)
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/* File is opened using open(.., 3, ..) and is writeable only for ioctls
   (specialy hack for floppy.c) */
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#define FMODE_WRITE_IOCTL	((__force fmode_t)0x100)
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/*
 * Don't update ctime and mtime.
 *
 * Currently a special hack for the XFS open_by_handle ioctl, but we'll
 * hopefully graduate it to a proper O_CMTIME flag supported by open(2) soon.
 */
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#define FMODE_NOCMTIME		((__force fmode_t)0x800)
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/* Expect random access pattern */
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#define FMODE_RANDOM		((__force fmode_t)0x1000)
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/* File is huge (eg. /dev/kmem): treat loff_t as unsigned */
#define FMODE_UNSIGNED_OFFSET	((__force fmode_t)0x2000)

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/* File is opened with O_PATH; almost nothing can be done with it */
#define FMODE_PATH		((__force fmode_t)0x4000)

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/* File was opened by fanotify and shouldn't generate fanotify events */
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#define FMODE_NONOTIFY		((__force fmode_t)0x1000000)
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/*
 * The below are the various read and write types that we support. Some of
 * them include behavioral modifiers that send information down to the
 * block layer and IO scheduler. Terminology:
 *
 *	The block layer uses device plugging to defer IO a little bit, in
 *	the hope that we will see more IO very shortly. This increases
 *	coalescing of adjacent IO and thus reduces the number of IOs we
 *	have to send to the device. It also allows for better queuing,
 *	if the IO isn't mergeable. If the caller is going to be waiting
 *	for the IO, then he must ensure that the device is unplugged so
 *	that the IO is dispatched to the driver.
 *
 *	All IO is handled async in Linux. This is fine for background
 *	writes, but for reads or writes that someone waits for completion
 *	on, we want to notify the block layer and IO scheduler so that they
 *	know about it. That allows them to make better scheduling
 *	decisions. So when the below references 'sync' and 'async', it
 *	is referencing this priority hint.
 *
 * With that in mind, the available types are:
 *
 * READ			A normal read operation. Device will be plugged.
 * READ_SYNC		A synchronous read. Device is not plugged, caller can
 *			immediately wait on this read without caring about
 *			unplugging.
 * READA		Used for read-ahead operations. Lower priority, and the
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 *			block layer could (in theory) choose to ignore this
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 *			request if it runs into resource problems.
 * WRITE		A normal async write. Device will be plugged.
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 * WRITE_SYNC		Synchronous write. Identical to WRITE, but passes down
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 *			the hint that someone will be waiting on this IO
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 *			shortly. The write equivalent of READ_SYNC.
 * WRITE_ODIRECT	Special case write for O_DIRECT only.
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 * WRITE_FLUSH		Like WRITE_SYNC but with preceding cache flush.
 * WRITE_FUA		Like WRITE_SYNC but data is guaranteed to be on
 *			non-volatile media on completion.
 * WRITE_FLUSH_FUA	Combination of WRITE_FLUSH and FUA. The IO is preceded
 *			by a cache flush and data is guaranteed to be on
 *			non-volatile media on completion.
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 *
 */
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#define RW_MASK			REQ_WRITE
#define RWA_MASK		REQ_RAHEAD
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#define READ			0
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#define WRITE			RW_MASK
#define READA			RWA_MASK
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#define READ_SYNC		(READ | REQ_SYNC)
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#define READ_META		(READ | REQ_META)
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#define WRITE_SYNC		(WRITE | REQ_SYNC | REQ_NOIDLE)
#define WRITE_ODIRECT		(WRITE | REQ_SYNC)
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#define WRITE_META		(WRITE | REQ_META)
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#define WRITE_FLUSH		(WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH)
#define WRITE_FUA		(WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FUA)
#define WRITE_FLUSH_FUA		(WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH | REQ_FUA)
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#define SEL_IN		1
#define SEL_OUT		2
#define SEL_EX		4

/* public flags for file_system_type */
#define FS_REQUIRES_DEV 1 
#define FS_BINARY_MOUNTDATA 2
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#define FS_HAS_SUBTYPE 4
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#define FS_REVAL_DOT	16384	/* Check the paths ".", ".." for staleness */
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#define FS_RENAME_DOES_D_MOVE	32768	/* FS will handle d_move()
					 * during rename() internally.
					 */

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/*
 * These are the fs-independent mount-flags: up to 32 flags are supported
 */
#define MS_RDONLY	 1	/* Mount read-only */
#define MS_NOSUID	 2	/* Ignore suid and sgid bits */
#define MS_NODEV	 4	/* Disallow access to device special files */
#define MS_NOEXEC	 8	/* Disallow program execution */
#define MS_SYNCHRONOUS	16	/* Writes are synced at once */
#define MS_REMOUNT	32	/* Alter flags of a mounted FS */
#define MS_MANDLOCK	64	/* Allow mandatory locks on an FS */
#define MS_DIRSYNC	128	/* Directory modifications are synchronous */
#define MS_NOATIME	1024	/* Do not update access times. */
#define MS_NODIRATIME	2048	/* Do not update directory access times */
#define MS_BIND		4096
#define MS_MOVE		8192
#define MS_REC		16384
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#define MS_VERBOSE	32768	/* War is peace. Verbosity is silence.
				   MS_VERBOSE is deprecated. */
#define MS_SILENT	32768
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#define MS_POSIXACL	(1<<16)	/* VFS does not apply the umask */
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#define MS_UNBINDABLE	(1<<17)	/* change to unbindable */
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#define MS_PRIVATE	(1<<18)	/* change to private */
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#define MS_SLAVE	(1<<19)	/* change to slave */
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#define MS_SHARED	(1<<20)	/* change to shared */
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#define MS_RELATIME	(1<<21)	/* Update atime relative to mtime/ctime. */
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#define MS_KERNMOUNT	(1<<22) /* this is a kern_mount call */
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#define MS_I_VERSION	(1<<23) /* Update inode I_version field */
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#define MS_STRICTATIME	(1<<24) /* Always perform atime updates */
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#define MS_BORN		(1<<29)
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#define MS_ACTIVE	(1<<30)
#define MS_NOUSER	(1<<31)

/*
 * Superblock flags that can be altered by MS_REMOUNT
 */
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#define MS_RMT_MASK	(MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_I_VERSION)
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/*
 * Old magic mount flag and mask
 */
#define MS_MGC_VAL 0xC0ED0000
#define MS_MGC_MSK 0xffff0000

/* Inode flags - they have nothing to superblock flags now */

#define S_SYNC		1	/* Writes are synced at once */
#define S_NOATIME	2	/* Do not update access times */
#define S_APPEND	4	/* Append-only file */
#define S_IMMUTABLE	8	/* Immutable file */
#define S_DEAD		16	/* removed, but still open directory */
#define S_NOQUOTA	32	/* Inode is not counted to quota */
#define S_DIRSYNC	64	/* Directory modifications are synchronous */
#define S_NOCMTIME	128	/* Do not update file c/mtime */
#define S_SWAPFILE	256	/* Do not truncate: swapon got its bmaps */
#define S_PRIVATE	512	/* Inode is fs-internal */
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#define S_IMA		1024	/* Inode has an associated IMA struct */
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#define S_AUTOMOUNT	2048	/* Automount/referral quasi-directory */
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/*
 * Note that nosuid etc flags are inode-specific: setting some file-system
 * flags just means all the inodes inherit those flags by default. It might be
 * possible to override it selectively if you really wanted to with some
 * ioctl() that is not currently implemented.
 *
 * Exception: MS_RDONLY is always applied to the entire file system.
 *
 * Unfortunately, it is possible to change a filesystems flags with it mounted
 * with files in use.  This means that all of the inodes will not have their
 * i_flags updated.  Hence, i_flags no longer inherit the superblock mount
 * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
 */
#define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg))

#define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY)
#define IS_SYNC(inode)		(__IS_FLG(inode, MS_SYNCHRONOUS) || \
					((inode)->i_flags & S_SYNC))
#define IS_DIRSYNC(inode)	(__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \
					((inode)->i_flags & (S_SYNC|S_DIRSYNC)))
#define IS_MANDLOCK(inode)	__IS_FLG(inode, MS_MANDLOCK)
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#define IS_NOATIME(inode)   __IS_FLG(inode, MS_RDONLY|MS_NOATIME)
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#define IS_I_VERSION(inode)   __IS_FLG(inode, MS_I_VERSION)
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#define IS_NOQUOTA(inode)	((inode)->i_flags & S_NOQUOTA)
#define IS_APPEND(inode)	((inode)->i_flags & S_APPEND)
#define IS_IMMUTABLE(inode)	((inode)->i_flags & S_IMMUTABLE)
#define IS_POSIXACL(inode)	__IS_FLG(inode, MS_POSIXACL)

#define IS_DEADDIR(inode)	((inode)->i_flags & S_DEAD)
#define IS_NOCMTIME(inode)	((inode)->i_flags & S_NOCMTIME)
#define IS_SWAPFILE(inode)	((inode)->i_flags & S_SWAPFILE)
#define IS_PRIVATE(inode)	((inode)->i_flags & S_PRIVATE)
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#define IS_IMA(inode)		((inode)->i_flags & S_IMA)
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#define IS_AUTOMOUNT(inode)	((inode)->i_flags & S_AUTOMOUNT)
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/* the read-only stuff doesn't really belong here, but any other place is
   probably as bad and I don't want to create yet another include file. */

#define BLKROSET   _IO(0x12,93)	/* set device read-only (0 = read-write) */
#define BLKROGET   _IO(0x12,94)	/* get read-only status (0 = read_write) */
#define BLKRRPART  _IO(0x12,95)	/* re-read partition table */
#define BLKGETSIZE _IO(0x12,96)	/* return device size /512 (long *arg) */
#define BLKFLSBUF  _IO(0x12,97)	/* flush buffer cache */
#define BLKRASET   _IO(0x12,98)	/* set read ahead for block device */
#define BLKRAGET   _IO(0x12,99)	/* get current read ahead setting */
#define BLKFRASET  _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */
#define BLKFRAGET  _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */
#define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */
#define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */
#define BLKSSZGET  _IO(0x12,104)/* get block device sector size */
#if 0
#define BLKPG      _IO(0x12,105)/* See blkpg.h */

/* Some people are morons.  Do not use sizeof! */

#define BLKELVGET  _IOR(0x12,106,size_t)/* elevator get */
#define BLKELVSET  _IOW(0x12,107,size_t)/* elevator set */
/* This was here just to show that the number is taken -
   probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */
#endif
/* A jump here: 108-111 have been used for various private purposes. */
#define BLKBSZGET  _IOR(0x12,112,size_t)
#define BLKBSZSET  _IOW(0x12,113,size_t)
#define BLKGETSIZE64 _IOR(0x12,114,size_t)	/* return device size in bytes (u64 *arg) */
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#define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup)
#define BLKTRACESTART _IO(0x12,116)
#define BLKTRACESTOP _IO(0x12,117)
#define BLKTRACETEARDOWN _IO(0x12,118)
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#define BLKDISCARD _IO(0x12,119)
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#define BLKIOMIN _IO(0x12,120)
#define BLKIOOPT _IO(0x12,121)
#define BLKALIGNOFF _IO(0x12,122)
#define BLKPBSZGET _IO(0x12,123)
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#define BLKDISCARDZEROES _IO(0x12,124)
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#define BLKSECDISCARD _IO(0x12,125)
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#define BMAP_IOCTL 1		/* obsolete - kept for compatibility */
#define FIBMAP	   _IO(0x00,1)	/* bmap access */
#define FIGETBSZ   _IO(0x00,2)	/* get the block size used for bmap */
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#define FIFREEZE	_IOWR('X', 119, int)	/* Freeze */
#define FITHAW		_IOWR('X', 120, int)	/* Thaw */
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#define FITRIM		_IOWR('X', 121, struct fstrim_range)	/* Trim */
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#define	FS_IOC_GETFLAGS			_IOR('f', 1, long)
#define	FS_IOC_SETFLAGS			_IOW('f', 2, long)
#define	FS_IOC_GETVERSION		_IOR('v', 1, long)
#define	FS_IOC_SETVERSION		_IOW('v', 2, long)
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#define FS_IOC_FIEMAP			_IOWR('f', 11, struct fiemap)
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#define FS_IOC32_GETFLAGS		_IOR('f', 1, int)
#define FS_IOC32_SETFLAGS		_IOW('f', 2, int)
#define FS_IOC32_GETVERSION		_IOR('v', 1, int)
#define FS_IOC32_SETVERSION		_IOW('v', 2, int)

/*
 * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS)
 */
#define	FS_SECRM_FL			0x00000001 /* Secure deletion */
#define	FS_UNRM_FL			0x00000002 /* Undelete */
#define	FS_COMPR_FL			0x00000004 /* Compress file */
#define FS_SYNC_FL			0x00000008 /* Synchronous updates */
#define FS_IMMUTABLE_FL			0x00000010 /* Immutable file */
#define FS_APPEND_FL			0x00000020 /* writes to file may only append */
#define FS_NODUMP_FL			0x00000040 /* do not dump file */
#define FS_NOATIME_FL			0x00000080 /* do not update atime */
/* Reserved for compression usage... */
#define FS_DIRTY_FL			0x00000100
#define FS_COMPRBLK_FL			0x00000200 /* One or more compressed clusters */
#define FS_NOCOMP_FL			0x00000400 /* Don't compress */
#define FS_ECOMPR_FL			0x00000800 /* Compression error */
/* End compression flags --- maybe not all used */
#define FS_BTREE_FL			0x00001000 /* btree format dir */
#define FS_INDEX_FL			0x00001000 /* hash-indexed directory */
#define FS_IMAGIC_FL			0x00002000 /* AFS directory */
#define FS_JOURNAL_DATA_FL		0x00004000 /* Reserved for ext3 */
#define FS_NOTAIL_FL			0x00008000 /* file tail should not be merged */
#define FS_DIRSYNC_FL			0x00010000 /* dirsync behaviour (directories only) */
#define FS_TOPDIR_FL			0x00020000 /* Top of directory hierarchies*/
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#define FS_EXTENT_FL			0x00080000 /* Extents */
#define FS_DIRECTIO_FL			0x00100000 /* Use direct i/o */
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#define FS_NOCOW_FL			0x00800000 /* Do not cow file */
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#define FS_RESERVED_FL			0x80000000 /* reserved for ext2 lib */

#define FS_FL_USER_VISIBLE		0x0003DFFF /* User visible flags */
#define FS_FL_USER_MODIFIABLE		0x000380FF /* User modifiable flags */


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#define SYNC_FILE_RANGE_WAIT_BEFORE	1
#define SYNC_FILE_RANGE_WRITE		2
#define SYNC_FILE_RANGE_WAIT_AFTER	4

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#ifdef __KERNEL__

#include <linux/linkage.h>
#include <linux/wait.h>
#include <linux/types.h>
#include <linux/kdev_t.h>
#include <linux/dcache.h>
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#include <linux/path.h>
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#include <linux/stat.h>
#include <linux/cache.h>
#include <linux/list.h>
#include <linux/radix-tree.h>
#include <linux/prio_tree.h>
#include <linux/init.h>
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#include <linux/pid.h>
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#include <linux/mutex.h>
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#include <linux/capability.h>
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#include <linux/semaphore.h>
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#include <linux/fiemap.h>
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#include <linux/rculist_bl.h>
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#include <asm/atomic.h>
#include <asm/byteorder.h>

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struct export_operations;
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struct hd_geometry;
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struct iovec;
struct nameidata;
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struct kiocb;
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struct kobject;
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struct pipe_inode_info;
struct poll_table_struct;
struct kstatfs;
struct vm_area_struct;
struct vfsmount;
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struct cred;
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extern void __init inode_init(void);
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extern void __init inode_init_early(void);
extern void __init files_init(unsigned long);

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extern struct files_stat_struct files_stat;
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extern unsigned long get_max_files(void);
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extern int sysctl_nr_open;
extern struct inodes_stat_t inodes_stat;
extern int leases_enable, lease_break_time;

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struct buffer_head;
typedef int (get_block_t)(struct inode *inode, sector_t iblock,
			struct buffer_head *bh_result, int create);
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typedef void (dio_iodone_t)(struct kiocb *iocb, loff_t offset,
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			ssize_t bytes, void *private, int ret,
			bool is_async);
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/*
 * Attribute flags.  These should be or-ed together to figure out what
 * has been changed!
 */
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#define ATTR_MODE	(1 << 0)
#define ATTR_UID	(1 << 1)
#define ATTR_GID	(1 << 2)
#define ATTR_SIZE	(1 << 3)
#define ATTR_ATIME	(1 << 4)
#define ATTR_MTIME	(1 << 5)
#define ATTR_CTIME	(1 << 6)
#define ATTR_ATIME_SET	(1 << 7)
#define ATTR_MTIME_SET	(1 << 8)
#define ATTR_FORCE	(1 << 9) /* Not a change, but a change it */
#define ATTR_ATTR_FLAG	(1 << 10)
#define ATTR_KILL_SUID	(1 << 11)
#define ATTR_KILL_SGID	(1 << 12)
#define ATTR_FILE	(1 << 13)
#define ATTR_KILL_PRIV	(1 << 14)
#define ATTR_OPEN	(1 << 15) /* Truncating from open(O_TRUNC) */
#define ATTR_TIMES_SET	(1 << 16)
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/*
 * This is the Inode Attributes structure, used for notify_change().  It
 * uses the above definitions as flags, to know which values have changed.
 * Also, in this manner, a Filesystem can look at only the values it cares
 * about.  Basically, these are the attributes that the VFS layer can
 * request to change from the FS layer.
 *
 * Derek Atkins <warlord@MIT.EDU> 94-10-20
 */
struct iattr {
	unsigned int	ia_valid;
	umode_t		ia_mode;
	uid_t		ia_uid;
	gid_t		ia_gid;
	loff_t		ia_size;
	struct timespec	ia_atime;
	struct timespec	ia_mtime;
	struct timespec	ia_ctime;
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	/*
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	 * Not an attribute, but an auxiliary info for filesystems wanting to
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	 * implement an ftruncate() like method.  NOTE: filesystem should
	 * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL).
	 */
	struct file	*ia_file;
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};

/*
 * Includes for diskquotas.
 */
#include <linux/quota.h>

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/** 
 * enum positive_aop_returns - aop return codes with specific semantics
 *
 * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has
 * 			    completed, that the page is still locked, and
 * 			    should be considered active.  The VM uses this hint
 * 			    to return the page to the active list -- it won't
 * 			    be a candidate for writeback again in the near
 * 			    future.  Other callers must be careful to unlock
 * 			    the page if they get this return.  Returned by
 * 			    writepage(); 
 *
 * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has
 *  			unlocked it and the page might have been truncated.
 *  			The caller should back up to acquiring a new page and
 *  			trying again.  The aop will be taking reasonable
 *  			precautions not to livelock.  If the caller held a page
 *  			reference, it should drop it before retrying.  Returned
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 *  			by readpage().
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 *
 * address_space_operation functions return these large constants to indicate
 * special semantics to the caller.  These are much larger than the bytes in a
 * page to allow for functions that return the number of bytes operated on in a
 * given page.
 */

enum positive_aop_returns {
	AOP_WRITEPAGE_ACTIVATE	= 0x80000,
	AOP_TRUNCATED_PAGE	= 0x80001,
};

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#define AOP_FLAG_UNINTERRUPTIBLE	0x0001 /* will not do a short write */
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#define AOP_FLAG_CONT_EXPAND		0x0002 /* called from cont_expand */
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#define AOP_FLAG_NOFS			0x0004 /* used by filesystem to direct
						* helper code (eg buffer layer)
						* to clear GFP_FS from alloc */
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/*
 * oh the beauties of C type declarations.
 */
struct page;
struct address_space;
struct writeback_control;

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struct iov_iter {
	const struct iovec *iov;
	unsigned long nr_segs;
	size_t iov_offset;
	size_t count;
};

size_t iov_iter_copy_from_user_atomic(struct page *page,
		struct iov_iter *i, unsigned long offset, size_t bytes);
size_t iov_iter_copy_from_user(struct page *page,
		struct iov_iter *i, unsigned long offset, size_t bytes);
void iov_iter_advance(struct iov_iter *i, size_t bytes);
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int iov_iter_fault_in_readable(struct iov_iter *i, size_t bytes);
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size_t iov_iter_single_seg_count(struct iov_iter *i);

static inline void iov_iter_init(struct iov_iter *i,
			const struct iovec *iov, unsigned long nr_segs,
			size_t count, size_t written)
{
	i->iov = iov;
	i->nr_segs = nr_segs;
	i->iov_offset = 0;
	i->count = count + written;

	iov_iter_advance(i, written);
}

static inline size_t iov_iter_count(struct iov_iter *i)
{
	return i->count;
}

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/*
 * "descriptor" for what we're up to with a read.
 * This allows us to use the same read code yet
 * have multiple different users of the data that
 * we read from a file.
 *
 * The simplest case just copies the data to user
 * mode.
 */
typedef struct {
	size_t written;
	size_t count;
	union {
		char __user *buf;
		void *data;
	} arg;
	int error;
} read_descriptor_t;

typedef int (*read_actor_t)(read_descriptor_t *, struct page *,
		unsigned long, unsigned long);
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struct address_space_operations {
	int (*writepage)(struct page *page, struct writeback_control *wbc);
	int (*readpage)(struct file *, struct page *);

	/* Write back some dirty pages from this mapping. */
	int (*writepages)(struct address_space *, struct writeback_control *);

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	/* Set a page dirty.  Return true if this dirtied it */
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	int (*set_page_dirty)(struct page *page);

	int (*readpages)(struct file *filp, struct address_space *mapping,
			struct list_head *pages, unsigned nr_pages);

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	int (*write_begin)(struct file *, struct address_space *mapping,
				loff_t pos, unsigned len, unsigned flags,
				struct page **pagep, void **fsdata);
	int (*write_end)(struct file *, struct address_space *mapping,
				loff_t pos, unsigned len, unsigned copied,
				struct page *page, void *fsdata);

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	/* Unfortunately this kludge is needed for FIBMAP. Don't use it */
	sector_t (*bmap)(struct address_space *, sector_t);
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	void (*invalidatepage) (struct page *, unsigned long);
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	int (*releasepage) (struct page *, gfp_t);
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	void (*freepage)(struct page *);
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	ssize_t (*direct_IO)(int, struct kiocb *, const struct iovec *iov,
			loff_t offset, unsigned long nr_segs);
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	int (*get_xip_mem)(struct address_space *, pgoff_t, int,
						void **, unsigned long *);
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	/* migrate the contents of a page to the specified target */
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	int (*migratepage) (struct address_space *,
			struct page *, struct page *);
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	int (*launder_page) (struct page *);
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	int (*is_partially_uptodate) (struct page *, read_descriptor_t *,
					unsigned long);
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	int (*error_remove_page)(struct address_space *, struct page *);
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};

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extern const struct address_space_operations empty_aops;

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/*
 * pagecache_write_begin/pagecache_write_end must be used by general code
 * to write into the pagecache.
 */
int pagecache_write_begin(struct file *, struct address_space *mapping,
				loff_t pos, unsigned len, unsigned flags,
				struct page **pagep, void **fsdata);

int pagecache_write_end(struct file *, struct address_space *mapping,
				loff_t pos, unsigned len, unsigned copied,
				struct page *page, void *fsdata);

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struct backing_dev_info;
struct address_space {
	struct inode		*host;		/* owner: inode, block_device */
	struct radix_tree_root	page_tree;	/* radix tree of all pages */
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	spinlock_t		tree_lock;	/* and lock protecting it */
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	unsigned int		i_mmap_writable;/* count VM_SHARED mappings */
	struct prio_tree_root	i_mmap;		/* tree of private and shared mappings */
	struct list_head	i_mmap_nonlinear;/*list VM_NONLINEAR mappings */
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	struct mutex		i_mmap_mutex;	/* protect tree, count, list */
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	unsigned long		nrpages;	/* number of total pages */
	pgoff_t			writeback_index;/* writeback starts here */
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	const struct address_space_operations *a_ops;	/* methods */
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	unsigned long		flags;		/* error bits/gfp mask */
	struct backing_dev_info *backing_dev_info; /* device readahead, etc */
	spinlock_t		private_lock;	/* for use by the address_space */
	struct list_head	private_list;	/* ditto */
	struct address_space	*assoc_mapping;	/* ditto */
} __attribute__((aligned(sizeof(long))));
	/*
	 * On most architectures that alignment is already the case; but
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	 * must be enforced here for CRIS, to let the least significant bit
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	 * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON.
	 */

struct block_device {
	dev_t			bd_dev;  /* not a kdev_t - it's a search key */
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	int			bd_openers;
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	struct inode *		bd_inode;	/* will die */
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	struct super_block *	bd_super;
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	struct mutex		bd_mutex;	/* open/close mutex */
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	struct list_head	bd_inodes;
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	void *			bd_claiming;
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	void *			bd_holder;
	int			bd_holders;
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	bool			bd_write_holder;
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#ifdef CONFIG_SYSFS
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	struct list_head	bd_holder_disks;
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#endif
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	struct block_device *	bd_contains;
	unsigned		bd_block_size;
	struct hd_struct *	bd_part;
	/* number of times partitions within this device have been opened. */
	unsigned		bd_part_count;
	int			bd_invalidated;
	struct gendisk *	bd_disk;
	struct list_head	bd_list;
	/*
	 * Private data.  You must have bd_claim'ed the block_device
	 * to use this.  NOTE:  bd_claim allows an owner to claim
	 * the same device multiple times, the owner must take special
	 * care to not mess up bd_private for that case.
	 */
	unsigned long		bd_private;
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	/* The counter of freeze processes */
	int			bd_fsfreeze_count;
	/* Mutex for freeze */
	struct mutex		bd_fsfreeze_mutex;
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};

/*
 * Radix-tree tags, for tagging dirty and writeback pages within the pagecache
 * radix trees
 */
#define PAGECACHE_TAG_DIRTY	0
#define PAGECACHE_TAG_WRITEBACK	1
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#define PAGECACHE_TAG_TOWRITE	2
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int mapping_tagged(struct address_space *mapping, int tag);

/*
 * Might pages of this file be mapped into userspace?
 */
static inline int mapping_mapped(struct address_space *mapping)
{
	return	!prio_tree_empty(&mapping->i_mmap) ||
		!list_empty(&mapping->i_mmap_nonlinear);
}

/*
 * Might pages of this file have been modified in userspace?
 * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff
 * marks vma as VM_SHARED if it is shared, and the file was opened for
 * writing i.e. vma may be mprotected writable even if now readonly.
 */
static inline int mapping_writably_mapped(struct address_space *mapping)
{
	return mapping->i_mmap_writable != 0;
}

/*
 * Use sequence counter to get consistent i_size on 32-bit processors.
 */
#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
#include <linux/seqlock.h>
#define __NEED_I_SIZE_ORDERED
#define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount)
#else
#define i_size_ordered_init(inode) do { } while (0)
#endif

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struct posix_acl;
#define ACL_NOT_CACHED ((void *)(-1))

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struct inode {
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	/* RCU path lookup touches following: */
	umode_t			i_mode;
	uid_t			i_uid;
	gid_t			i_gid;
	const struct inode_operations	*i_op;
	struct super_block	*i_sb;

	spinlock_t		i_lock;	/* i_blocks, i_bytes, maybe i_size */
	unsigned int		i_flags;
	struct mutex		i_mutex;

	unsigned long		i_state;
	unsigned long		dirtied_when;	/* jiffies of first dirtying */

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	struct hlist_node	i_hash;
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	struct list_head	i_wb_list;	/* backing dev IO list */
	struct list_head	i_lru;		/* inode LRU list */
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	struct list_head	i_sb_list;
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	union {
		struct list_head	i_dentry;
		struct rcu_head		i_rcu;
	};
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	unsigned long		i_ino;
	atomic_t		i_count;
	unsigned int		i_nlink;
	dev_t			i_rdev;
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	unsigned int		i_blkbits;
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	u64			i_version;
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	loff_t			i_size;
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#ifdef __NEED_I_SIZE_ORDERED
	seqcount_t		i_size_seqcount;
#endif
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	struct timespec		i_atime;
	struct timespec		i_mtime;
	struct timespec		i_ctime;
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	blkcnt_t		i_blocks;
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	unsigned short          i_bytes;
	struct rw_semaphore	i_alloc_sem;
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	const struct file_operations	*i_fop;	/* former ->i_op->default_file_ops */
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	struct file_lock	*i_flock;
	struct address_space	*i_mapping;
	struct address_space	i_data;
#ifdef CONFIG_QUOTA
	struct dquot		*i_dquot[MAXQUOTAS];
#endif
	struct list_head	i_devices;
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	union {
		struct pipe_inode_info	*i_pipe;
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		struct block_device	*i_bdev;
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		struct cdev		*i_cdev;
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	};
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	__u32			i_generation;

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#ifdef CONFIG_FSNOTIFY
	__u32			i_fsnotify_mask; /* all events this inode cares about */
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	struct hlist_head	i_fsnotify_marks;
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#endif

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#ifdef CONFIG_IMA
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	atomic_t		i_readcount; /* struct files open RO */
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#endif
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	atomic_t		i_writecount;
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#ifdef CONFIG_SECURITY
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	void			*i_security;
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#endif
#ifdef CONFIG_FS_POSIX_ACL
	struct posix_acl	*i_acl;
	struct posix_acl	*i_default_acl;
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#endif
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	void			*i_private; /* fs or device private pointer */
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};

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static inline int inode_unhashed(struct inode *inode)
{
	return hlist_unhashed(&inode->i_hash);
}

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/*
 * inode->i_mutex nesting subclasses for the lock validator:
 *
 * 0: the object of the current VFS operation
 * 1: parent
 * 2: child/target
 * 3: quota file
 *
 * The locking order between these classes is
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 * parent -> child -> normal -> xattr -> quota
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 */
enum inode_i_mutex_lock_class
{
	I_MUTEX_NORMAL,
	I_MUTEX_PARENT,
	I_MUTEX_CHILD,
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	I_MUTEX_XATTR,
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	I_MUTEX_QUOTA
};

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/*
 * NOTE: in a 32bit arch with a preemptable kernel and
 * an UP compile the i_size_read/write must be atomic
 * with respect to the local cpu (unlike with preempt disabled),
 * but they don't need to be atomic with respect to other cpus like in
 * true SMP (so they need either to either locally disable irq around
 * the read or for example on x86 they can be still implemented as a
 * cmpxchg8b without the need of the lock prefix). For SMP compiles
 * and 64bit archs it makes no difference if preempt is enabled or not.
 */
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static inline loff_t i_size_read(const struct inode *inode)
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{
#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
	loff_t i_size;
	unsigned int seq;

	do {
		seq = read_seqcount_begin(&inode->i_size_seqcount);
		i_size = inode->i_size;
	} while (read_seqcount_retry(&inode->i_size_seqcount, seq));
	return i_size;
#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
	loff_t i_size;

	preempt_disable();
	i_size = inode->i_size;
	preempt_enable();
	return i_size;
#else
	return inode->i_size;
#endif
}

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/*
 * NOTE: unlike i_size_read(), i_size_write() does need locking around it
 * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount
 * can be lost, resulting in subsequent i_size_read() calls spinning forever.
 */
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static inline void i_size_write(struct inode *inode, loff_t i_size)
{
#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
	write_seqcount_begin(&inode->i_size_seqcount);
	inode->i_size = i_size;
	write_seqcount_end(&inode->i_size_seqcount);
#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
	preempt_disable();
	inode->i_size = i_size;
	preempt_enable();
#else
	inode->i_size = i_size;
#endif
}

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static inline unsigned iminor(const struct inode *inode)
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{
	return MINOR(inode->i_rdev);
}

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static inline unsigned imajor(const struct inode *inode)
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{
	return MAJOR(inode->i_rdev);
}

extern struct block_device *I_BDEV(struct inode *inode);

struct fown_struct {
	rwlock_t lock;          /* protects pid, uid, euid fields */
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	struct pid *pid;	/* pid or -pgrp where SIGIO should be sent */
	enum pid_type pid_type;	/* Kind of process group SIGIO should be sent to */
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	uid_t uid, euid;	/* uid/euid of process setting the owner */
	int signum;		/* posix.1b rt signal to be delivered on IO */
};

/*
 * Track a single file's readahead state
 */
struct file_ra_state {
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	pgoff_t start;			/* where readahead started */
	unsigned int size;		/* # of readahead pages */
	unsigned int async_size;	/* do asynchronous readahead when
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					   there are only # of pages ahead */
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	unsigned int ra_pages;		/* Maximum readahead window */
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	unsigned int mmap_miss;		/* Cache miss stat for mmap accesses */
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	loff_t prev_pos;		/* Cache last read() position */
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};

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/*
 * Check if @index falls in the readahead windows.
 */
static inline int ra_has_index(struct file_ra_state *ra, pgoff_t index)
{
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	return (index >= ra->start &&
		index <  ra->start + ra->size);
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}

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#define FILE_MNT_WRITE_TAKEN	1
#define FILE_MNT_WRITE_RELEASED	2

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struct file {
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	/*
	 * fu_list becomes invalid after file_free is called and queued via
	 * fu_rcuhead for RCU freeing
	 */
	union {
		struct list_head	fu_list;
		struct rcu_head 	fu_rcuhead;
	} f_u;
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	struct path		f_path;
#define f_dentry	f_path.dentry
#define f_vfsmnt	f_path.mnt
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	const struct file_operations	*f_op;
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	spinlock_t		f_lock;  /* f_ep_links, f_flags, no IRQ */
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#ifdef CONFIG_SMP
	int			f_sb_list_cpu;
#endif
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	atomic_long_t		f_count;
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	unsigned int 		f_flags;
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	fmode_t			f_mode;
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	loff_t			f_pos;
	struct fown_struct	f_owner;
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	const struct cred	*f_cred;
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	struct file_ra_state	f_ra;

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	u64			f_version;
958
#ifdef CONFIG_SECURITY
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	void			*f_security;
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#endif
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	/* needed for tty driver, and maybe others */
	void			*private_data;

#ifdef CONFIG_EPOLL
	/* Used by fs/eventpoll.c to link all the hooks to this file */
	struct list_head	f_ep_links;
#endif /* #ifdef CONFIG_EPOLL */
	struct address_space	*f_mapping;
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#ifdef CONFIG_DEBUG_WRITECOUNT
	unsigned long f_mnt_write_state;
#endif
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};

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struct file_handle {
	__u32 handle_bytes;
	int handle_type;
	/* file identifier */
	unsigned char f_handle[0];
};

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#define get_file(x)	atomic_long_inc(&(x)->f_count)
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#define fput_atomic(x)	atomic_long_add_unless(&(x)->f_count, -1, 1)
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#define file_count(x)	atomic_long_read(&(x)->f_count)
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#ifdef CONFIG_DEBUG_WRITECOUNT
static inline void file_take_write(struct file *f)
{
	WARN_ON(f->f_mnt_write_state != 0);
	f->f_mnt_write_state = FILE_MNT_WRITE_TAKEN;
}
static inline void file_release_write(struct file *f)
{
	f->f_mnt_write_state |= FILE_MNT_WRITE_RELEASED;
}
static inline void file_reset_write(struct file *f)
{
	f->f_mnt_write_state = 0;
}
static inline void file_check_state(struct file *f)
{
	/*
	 * At this point, either both or neither of these bits
	 * should be set.
	 */
	WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN);
	WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_RELEASED);
}
static inline int file_check_writeable(struct file *f)
{
	if (f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN)
		return 0;
	printk(KERN_WARNING "writeable file with no "
			    "mnt_want_write()\n");
	WARN_ON(1);
	return -EINVAL;
}
#else /* !CONFIG_DEBUG_WRITECOUNT */
static inline void file_take_write(struct file *filp) {}
static inline void file_release_write(struct file *filp) {}
static inline void file_reset_write(struct file *filp) {}
static inline void file_check_state(struct file *filp) {}
static inline int file_check_writeable(struct file *filp)
{
	return 0;
}
#endif /* CONFIG_DEBUG_WRITECOUNT */

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#define	MAX_NON_LFS	((1UL<<31) - 1)

/* Page cache limit. The filesystems should put that into their s_maxbytes 
   limits, otherwise bad things can happen in VM. */ 
#if BITS_PER_LONG==32
#define MAX_LFS_FILESIZE	(((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1) 
#elif BITS_PER_LONG==64
#define MAX_LFS_FILESIZE 	0x7fffffffffffffffUL
#endif

#define FL_POSIX	1
#define FL_FLOCK	2
#define FL_ACCESS	8	/* not trying to lock, just looking */
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#define FL_EXISTS	16	/* when unlocking, test for existence */
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#define FL_LEASE	32	/* lease held on this file */
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#define FL_CLOSE	64	/* unlock on close */
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#define FL_SLEEP	128	/* A blocking lock */

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/*
 * Special return value from posix_lock_file() and vfs_lock_file() for
 * asynchronous locking.
 */
#define FILE_LOCK_DEFERRED 1

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/*
 * The POSIX file lock owner is determined by
 * the "struct files_struct" in the thread group
 * (or NULL for no owner - BSD locks).
 *
 * Lockd stuffs a "host" pointer into this.
 */
typedef struct files_struct *fl_owner_t;

struct file_lock_operations {
	void (*fl_copy_lock)(struct file_lock *, struct file_lock *);
	void (*fl_release_private)(struct file_lock *);
};

struct lock_manager_operations {
	int (*fl_compare_owner)(struct file_lock *, struct file_lock *);
	void (*fl_notify)(struct file_lock *);	/* unblock callback */
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	int (*fl_grant)(struct file_lock *, struct file_lock *, int);
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	void (*fl_release_private)(struct file_lock *);
	void (*fl_break)(struct file_lock *);
	int (*fl_change)(struct file_lock **, int);
};

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struct lock_manager {
	struct list_head list;
};

void locks_start_grace(struct lock_manager *);
void locks_end_grace(struct lock_manager *);
int locks_in_grace(void);

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/* that will die - we need it for nfs_lock_info */
#include <linux/nfs_fs_i.h>

struct file_lock {
	struct file_lock *fl_next;	/* singly linked list for this inode  */
	struct list_head fl_link;	/* doubly linked list of all locks */
	struct list_head fl_block;	/* circular list of blocked processes */
	fl_owner_t fl_owner;
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	unsigned char fl_flags;
	unsigned char fl_type;
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	unsigned int fl_pid;
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	struct pid *fl_nspid;
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	wait_queue_head_t fl_wait;
	struct file *fl_file;
	loff_t fl_start;
	loff_t fl_end;

	struct fasync_struct *	fl_fasync; /* for lease break notifications */
	unsigned long fl_break_time;	/* for nonblocking lease breaks */

1103
	const struct file_lock_operations *fl_ops;	/* Callbacks for filesystems */
1104
	const struct lock_manager_operations *fl_lmops;	/* Callbacks for lockmanagers */
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	union {
		struct nfs_lock_info	nfs_fl;
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		struct nfs4_lock_info	nfs4_fl;
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		struct {
			struct list_head link;	/* link in AFS vnode's pending_locks list */
			int state;		/* state of grant or error if -ve */
		} afs;
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	} fl_u;
};

/* The following constant reflects the upper bound of the file/locking space */
#ifndef OFFSET_MAX
#define INT_LIMIT(x)	(~((x)1 << (sizeof(x)*8 - 1)))
#define OFFSET_MAX	INT_LIMIT(loff_t)
#define OFFT_OFFSET_MAX	INT_LIMIT(off_t)
#endif

#include <linux/fcntl.h>

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extern void send_sigio(struct fown_struct *fown, int fd, int band);

#ifdef CONFIG_FILE_LOCKING
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extern int fcntl_getlk(struct file *, struct flock __user *);
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extern int fcntl_setlk(unsigned int, struct file *, unsigned int,
			struct flock __user *);
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#if BITS_PER_LONG == 32
extern int fcntl_getlk64(struct file *, struct flock64 __user *);
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extern int fcntl_setlk64(unsigned int, struct file *, unsigned int,
			struct flock64 __user *);
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#endif

extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg);
extern int fcntl_getlease(struct file *filp);

/* fs/locks.c */
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void locks_free_lock(struct file_lock *fl);
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extern void locks_init_lock(struct file_lock *);
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extern struct file_lock * locks_alloc_lock(void);
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extern void locks_copy_lock(struct file_lock *, struct file_lock *);
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extern void __locks_copy_lock(struct file_lock *, const struct file_lock *);
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extern void locks_remove_posix(struct file *, fl_owner_t);
extern void locks_remove_flock(struct file *);
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extern void locks_release_private(struct file_lock *);
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extern void posix_test_lock(struct file *, struct file_lock *);
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extern int posix_lock_file(struct file *, struct file_lock *, struct file_lock *);
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extern int posix_lock_file_wait(struct file *, struct file_lock *);
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extern int posix_unblock_lock(struct file *, struct file_lock *);
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extern int vfs_test_lock(struct file *, struct file_lock *);
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extern int vfs_lock_file(struct file *, unsigned int, struct file_lock *, struct file_lock *);
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extern int vfs_cancel_lock(struct file *filp, struct file_lock *fl);
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extern int flock_lock_file_wait(struct file *filp, struct file_lock *fl);
extern int __break_lease(struct inode *inode, unsigned int flags);
extern void lease_get_mtime(struct inode *, struct timespec *time);
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extern int generic_setlease(struct file *, long, struct file_lock **);
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extern int vfs_setlease(struct file *, long, struct file_lock **);
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extern int lease_modify(struct file_lock **, int);
extern int lock_may_read(struct inode *, loff_t start, unsigned long count);
extern int lock_may_write(struct inode *, loff_t start, unsigned long count);
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extern void lock_flocks(void);
extern void unlock_flocks(void);
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#else /* !CONFIG_FILE_LOCKING */
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static inline int fcntl_getlk(struct file *file, struct flock __user *user)
{
	return -EINVAL;
}

static inline int fcntl_setlk(unsigned int fd, struct file *file,
			      unsigned int cmd, struct flock __user *user)
{
	return -EACCES;
}

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#if BITS_PER_LONG == 32
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static inline int fcntl_getlk64(struct file *file, struct flock64 __user *user)
{
	return -EINVAL;
}

static inline int fcntl_setlk64(unsigned int fd, struct file *file,
				unsigned int cmd, struct flock64 __user *user)
{
	return -EACCES;
}
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#endif
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static inline int fcntl_setlease(unsigned int fd, struct file *filp, long arg)
{
	return 0;
}

static inline int fcntl_getlease(struct file *filp)
{
	return 0;
}

static inline void locks_init_lock(struct file_lock *fl)
{
	return;
}

static inline void __locks_copy_lock(struct file_lock *new, struct file_lock *fl)
{
	return;
}

static inline void locks_copy_lock(struct file_lock *new, struct file_lock *fl)
{
	return;
}

static inline void locks_remove_posix(struct file *filp, fl_owner_t owner)
{
	return;
}

static inline void locks_remove_flock(struct file *filp)
{
	return;
}

static inline void posix_test_lock(struct file *filp, struct file_lock *fl)
{
	return;
}

static inline int posix_lock_file(struct file *filp, struct file_lock *fl,
				  struct file_lock *conflock)
{
	return -ENOLCK;
}

static inline int posix_lock_file_wait(struct file *filp, struct file_lock *fl)
{
	return -ENOLCK;
}

static inline int posix_unblock_lock(struct file *filp,
				     struct file_lock *waiter)
{
	return -ENOENT;
}

static inline int vfs_test_lock(struct file *filp, struct file_lock *fl)
{
	return 0;
}

static inline int vfs_lock_file(struct file *filp, unsigned int cmd,
				struct file_lock *fl, struct file_lock *conf)
{
	return -ENOLCK;
}

static inline int vfs_cancel_lock(struct file *filp, struct file_lock *fl)
{
	return 0;
}

static inline int flock_lock_file_wait(struct file *filp,
				       struct file_lock *request)
{
	return -ENOLCK;
}

static inline int __break_lease(struct inode *inode, unsigned int mode)
{
	return 0;
}

static inline void lease_get_mtime(struct inode *inode, struct timespec *time)
{
	return;
}

static inline int generic_setlease(struct file *filp, long arg,
				    struct file_lock **flp)
{
	return -EINVAL;
}

static inline int vfs_setlease(struct file *filp, long arg,
			       struct file_lock **lease)
{
	return -EINVAL;
}

static inline int lease_modify(struct file_lock **before, int arg)
{
	return -EINVAL;
}

static inline int lock_may_read(struct inode *inode, loff_t start,
				unsigned long len)
{
	return 1;
}

static inline int lock_may_write(struct inode *inode, loff_t start,
				 unsigned long len)
{
	return 1;
}

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static inline void lock_flocks(void)
{
}

static inline void unlock_flocks(void)
{
}

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#endif /* !CONFIG_FILE_LOCKING */

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struct fasync_struct {
1320 1321 1322 1323 1324 1325
	spinlock_t		fa_lock;
	int			magic;
	int			fa_fd;
	struct fasync_struct	*fa_next; /* singly linked list */
	struct file		*fa_file;
	struct rcu_head		fa_rcu;
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};

#define FASYNC_MAGIC 0x4601

/* SMP safe fasync helpers: */
extern int fasync_helper(int, struct file *, int, struct fasync_struct **);
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extern struct fasync_struct *fasync_insert_entry(int, struct file *, struct fasync_struct **, struct fasync_struct *);
extern int fasync_remove_entry(struct file *, struct fasync_struct **);
extern struct fasync_struct *fasync_alloc(void);
extern void fasync_free(struct fasync_struct *);

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/* can be called from interrupts */
extern void kill_fasync(struct fasync_struct **, int, int);

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extern int __f_setown(struct file *filp, struct pid *, enum pid_type, int force);
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extern int f_setown(struct file *filp, unsigned long arg, int force);
extern void f_delown(struct file *filp);
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extern pid_t f_getown(struct file *filp);
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extern int send_sigurg(struct fown_struct *fown);

/*
 *	Umount options
 */

#define MNT_FORCE	0x00000001	/* Attempt to forcibily umount */
#define MNT_DETACH	0x00000002	/* Just detach from the tree */
#define MNT_EXPIRE	0x00000004	/* Mark for expiry */
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#define UMOUNT_NOFOLLOW	0x00000008	/* Don't follow symlink on umount */
#define UMOUNT_UNUSED	0x80000000	/* Flag guaranteed to be unused */
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extern struct list_head super_blocks;
extern spinlock_t sb_lock;

struct super_block {
	struct list_head	s_list;		/* Keep this first */
	dev_t			s_dev;		/* search index; _not_ kdev_t */
	unsigned char		s_dirt;
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	unsigned char		s_blocksize_bits;
	unsigned long		s_blocksize;
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	loff_t			s_maxbytes;	/* Max file size */
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	struct file_system_type	*s_type;
1367
	const struct super_operations	*s_op;
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	const struct dquot_operations	*dq_op;
1369
	const struct quotactl_ops	*s_qcop;
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	const struct export_operations *s_export_op;
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	unsigned long		s_flags;
	unsigned long		s_magic;
	struct dentry		*s_root;
	struct rw_semaphore	s_umount;
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	struct mutex		s_lock;
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	int			s_count;
	atomic_t		s_active;
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#ifdef CONFIG_SECURITY
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	void                    *s_security;
1380
#endif
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	const struct xattr_handler **s_xattr;
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	struct list_head	s_inodes;	/* all inodes */
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	struct hlist_bl_head	s_anon;		/* anonymous dentries for (nfs) exporting */
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#ifdef CONFIG_SMP
	struct list_head __percpu *s_files;
#else
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	struct list_head	s_files;
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#endif
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	/* s_dentry_lru, s_nr_dentry_unused protected by dcache.c lru locks */
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	struct list_head	s_dentry_lru;	/* unused dentry lru */
	int			s_nr_dentry_unused;	/* # of dentry on lru */
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	struct block_device	*s_bdev;
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	struct backing_dev_info *s_bdi;
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	struct mtd_info		*s_mtd;
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	struct list_head	s_instances;
	struct quota_info	s_dquot;	/* Diskquota specific options */

	int			s_frozen;
	wait_queue_head_t	s_wait_unfrozen;

	char s_id[32];				/* Informational name */
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	u8 s_uuid[16];				/* UUID */
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	void 			*s_fs_info;	/* Filesystem private info */
1407
	fmode_t			s_mode;
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	/* Granularity of c/m/atime in ns.
	   Cannot be worse than a second */
	u32		   s_time_gran;

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	/*
	 * The next field is for VFS *only*. No filesystems have any business
	 * even looking at it. You had been warned.
	 */
1417
	struct mutex s_vfs_rename_mutex;	/* Kludge */
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	/*
	 * Filesystem subtype.  If non-empty the filesystem type field
	 * in /proc/mounts will be "type.subtype"
	 */
	char *s_subtype;
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	/*
	 * Saved mount options for lazy filesystems using
	 * generic_show_options()
	 */
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	char __rcu *s_options;
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	const struct dentry_operations *s_d_op; /* default d_op for dentries */
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	/*
	 * Saved pool identifier for cleancache (-1 means none)
	 */
	int cleancache_poolid;
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};

extern struct timespec current_fs_time(struct super_block *sb);

/*
 * Snapshotting support.
 */
enum {
	SB_UNFROZEN = 0,
	SB_FREEZE_WRITE	= 1,
	SB_FREEZE_TRANS = 2,
};

#define vfs_check_frozen(sb, level) \
	wait_event((sb)->s_wait_unfrozen, ((sb)->s_frozen < (level)))

1452 1453 1454
#define get_fs_excl() atomic_inc(&current->fs_excl)
#define put_fs_excl() atomic_dec(&current->fs_excl)
#define has_fs_excl() atomic_read(&current->fs_excl)
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1456 1457 1458 1459 1460 1461
/*
 * until VFS tracks user namespaces for inodes, just make all files
 * belong to init_user_ns
 */
extern struct user_namespace init_user_ns;
#define inode_userns(inode) (&init_user_ns)
1462
extern bool inode_owner_or_capable(const struct inode *inode);
1463

1464 1465 1466
/* not quite ready to be deprecated, but... */
extern void lock_super(struct super_block *);
extern void unlock_super(struct super_block *);
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/*
 * VFS helper functions..
 */
extern int vfs_create(struct inode *, struct dentry *, int, struct nameidata *);
extern int vfs_mkdir(struct inode *, struct dentry *, int);
extern int vfs_mknod(struct inode *, struct dentry *, int, dev_t);
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extern int vfs_symlink(struct inode *, struct dentry *, const char *);
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extern int vfs_link(struct dentry *, struct inode *, struct dentry *);
extern int vfs_rmdir(struct inode *, struct dentry *);
extern int vfs_unlink(struct inode *, struct dentry *);
extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);

/*
 * VFS dentry helper functions.
 */
extern void dentry_unhash(struct dentry *dentry);

1485 1486 1487 1488
/*
 * VFS file helper functions.
 */
extern int file_permission(struct file *, int);
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extern void inode_init_owner(struct inode *inode, const struct inode *dir,
			mode_t mode);
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/*
 * VFS FS_IOC_FIEMAP helper definitions.
 */
struct fiemap_extent_info {
	unsigned int fi_flags;		/* Flags as passed from user */
	unsigned int fi_extents_mapped;	/* Number of mapped extents */
	unsigned int fi_extents_max;	/* Size of fiemap_extent array */
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	struct fiemap_extent __user *fi_extents_start; /* Start of
							fiemap_extent array */
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};
int fiemap_fill_next_extent(struct fiemap_extent_info *info, u64 logical,
			    u64 phys, u64 len, u32 flags);
int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags);

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/*
 * File types
 *
 * NOTE! These match bits 12..15 of stat.st_mode
 * (ie "(i_mode >> 12) & 15").
 */
#define DT_UNKNOWN	0
#define DT_FIFO		1
#define DT_CHR		2
#define DT_DIR		4
#define DT_BLK		6
#define DT_REG		8
#define DT_LNK		10
#define DT_SOCK		12
#define DT_WHT		14

/*
 * This is the "filldir" function type, used by readdir() to let
 * the kernel specify what kind of dirent layout it wants to have.
 * This allows the kernel to read directories into kernel space or
 * to have different dirent layouts depending on the binary type.
 */
1527
typedef int (*filldir_t)(void *, const char *, int, loff_t, u64, unsigned);
1528
struct block_device_operations;
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/* These macros are for out of kernel modules to test that
 * the kernel supports the unlocked_ioctl and compat_ioctl
 * fields in struct file_operations. */
#define HAVE_COMPAT_IOCTL 1
#define HAVE_UNLOCKED_IOCTL 1

/*
 * NOTE:
1538 1539
 * all file operations except setlease can be called without
 * the big kernel lock held in all filesystems.
L
Linus Torvalds 已提交
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 */
struct file_operations {
	struct module *owner;
	loff_t (*llseek) (struct file *, loff_t, int);
	ssize_t (*read) (struct file *, char __user *, size_t, loff_t *);
	ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *);
1546 1547
	ssize_t (*aio_read) (struct kiocb *, const struct iovec *, unsigned long, loff_t);
	ssize_t (*aio_write) (struct kiocb *, const struct iovec *, unsigned long, loff_t);
L
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	int (*readdir) (struct file *, void *, filldir_t);
	unsigned int (*poll) (struct file *, struct poll_table_struct *);
	long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);
	long (*compat_ioctl) (struct file *, unsigned int, unsigned long);
	int (*mmap) (struct file *, struct vm_area_struct *);
	int (*open) (struct inode *, struct file *);
1554
	int (*flush) (struct file *, fl_owner_t id);
L
Linus Torvalds 已提交
1555
	int (*release) (struct inode *, struct file *);
1556
	int (*fsync) (struct file *, int datasync);
L
Linus Torvalds 已提交
1557 1558 1559 1560 1561 1562 1563
	int (*aio_fsync) (struct kiocb *, int datasync);
	int (*fasync) (int, struct file *, int);
	int (*lock) (struct file *, int, struct file_lock *);
	ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int);
	unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
	int (*check_flags)(int);
	int (*flock) (struct file *, int, struct file_lock *);
1564 1565
	ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int);
	ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int);
1566
	int (*setlease)(struct file *, long, struct file_lock **);
1567 1568
	long (*fallocate)(struct file *file, int mode, loff_t offset,
			  loff_t len);
L
Linus Torvalds 已提交
1569 1570
};

1571 1572
#define IPERM_FLAG_RCU	0x0001

L
Linus Torvalds 已提交
1573 1574
struct inode_operations {
	struct dentry * (*lookup) (struct inode *,struct dentry *, struct nameidata *);
1575
	void * (*follow_link) (struct dentry *, struct nameidata *);
1576 1577
	int (*permission) (struct inode *, int, unsigned int);
	int (*check_acl)(struct inode *, int, unsigned int);
1578 1579 1580 1581 1582

	int (*readlink) (struct dentry *, char __user *,int);
	void (*put_link) (struct dentry *, struct nameidata *, void *);

	int (*create) (struct inode *,struct dentry *,int, struct nameidata *);
L
Linus Torvalds 已提交
1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597
	int (*link) (struct dentry *,struct inode *,struct dentry *);
	int (*unlink) (struct inode *,struct dentry *);
	int (*symlink) (struct inode *,struct dentry *,const char *);
	int (*mkdir) (struct inode *,struct dentry *,int);
	int (*rmdir) (struct inode *,struct dentry *);
	int (*mknod) (struct inode *,struct dentry *,int,dev_t);
	int (*rename) (struct inode *, struct dentry *,
			struct inode *, struct dentry *);
	void (*truncate) (struct inode *);
	int (*setattr) (struct dentry *, struct iattr *);
	int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *);
	int (*setxattr) (struct dentry *, const char *,const void *,size_t,int);
	ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t);
	ssize_t (*listxattr) (struct dentry *, char *, size_t);
	int (*removexattr) (struct dentry *, const char *);
1598
	void (*truncate_range)(struct inode *, loff_t, loff_t);
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Mark Fasheh 已提交
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	int (*fiemap)(struct inode *, struct fiemap_extent_info *, u64 start,
		      u64 len);
1601
} ____cacheline_aligned;
L
Linus Torvalds 已提交
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struct seq_file;

B
Badari Pulavarty 已提交
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ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector,
				unsigned long nr_segs, unsigned long fast_segs,
				struct iovec *fast_pointer,
				struct iovec **ret_pointer);

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Linus Torvalds 已提交
1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620
extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *);
extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *);
extern ssize_t vfs_readv(struct file *, const struct iovec __user *,
		unsigned long, loff_t *);
extern ssize_t vfs_writev(struct file *, const struct iovec __user *,
		unsigned long, loff_t *);

struct super_operations {
   	struct inode *(*alloc_inode)(struct super_block *sb);
	void (*destroy_inode)(struct inode *);

1621
   	void (*dirty_inode) (struct inode *, int flags);
1622
	int (*write_inode) (struct inode *, struct writeback_control *wbc);
1623
	int (*drop_inode) (struct inode *);
A
Al Viro 已提交
1624
	void (*evict_inode) (struct inode *);
L
Linus Torvalds 已提交
1625 1626 1627
	void (*put_super) (struct super_block *);
	void (*write_super) (struct super_block *);
	int (*sync_fs)(struct super_block *sb, int wait);
1628 1629
	int (*freeze_fs) (struct super_block *);
	int (*unfreeze_fs) (struct super_block *);
1630
	int (*statfs) (struct dentry *, struct kstatfs *);
L
Linus Torvalds 已提交
1631
	int (*remount_fs) (struct super_block *, int *, char *);
1632
	void (*umount_begin) (struct super_block *);
L
Linus Torvalds 已提交
1633 1634

	int (*show_options)(struct seq_file *, struct vfsmount *);
1635 1636
	int (*show_devname)(struct seq_file *, struct vfsmount *);
	int (*show_path)(struct seq_file *, struct vfsmount *);
1637
	int (*show_stats)(struct seq_file *, struct vfsmount *);
1638
#ifdef CONFIG_QUOTA
L
Linus Torvalds 已提交
1639 1640
	ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t);
	ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t);
1641
#endif
1642
	int (*bdev_try_to_free_page)(struct super_block*, struct page*, gfp_t);
L
Linus Torvalds 已提交
1643 1644
};

J
Joern Engel 已提交
1645
/*
1646
 * Inode state bits.  Protected by inode->i_lock
J
Joern Engel 已提交
1647 1648 1649 1650 1651 1652 1653 1654
 *
 * Three bits determine the dirty state of the inode, I_DIRTY_SYNC,
 * I_DIRTY_DATASYNC and I_DIRTY_PAGES.
 *
 * Four bits define the lifetime of an inode.  Initially, inodes are I_NEW,
 * until that flag is cleared.  I_WILL_FREE, I_FREEING and I_CLEAR are set at
 * various stages of removing an inode.
 *
C
Christoph Hellwig 已提交
1655
 * Two bits are used for locking and completion notification, I_NEW and I_SYNC.
J
Joern Engel 已提交
1656
 *
J
Joern Engel 已提交
1657 1658
 * I_DIRTY_SYNC		Inode is dirty, but doesn't have to be written on
 *			fdatasync().  i_atime is the usual cause.
1659 1660 1661 1662
 * I_DIRTY_DATASYNC	Data-related inode changes pending. We keep track of
 *			these changes separately from I_DIRTY_SYNC so that we
 *			don't have to write inode on fdatasync() when only
 *			mtime has changed in it.
J
Joern Engel 已提交
1663
 * I_DIRTY_PAGES	Inode has dirty pages.  Inode itself may be clean.
C
Christoph Hellwig 已提交
1664 1665 1666 1667 1668 1669 1670 1671
 * I_NEW		Serves as both a mutex and completion notification.
 *			New inodes set I_NEW.  If two processes both create
 *			the same inode, one of them will release its inode and
 *			wait for I_NEW to be released before returning.
 *			Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can
 *			also cause waiting on I_NEW, without I_NEW actually
 *			being set.  find_inode() uses this to prevent returning
 *			nearly-dead inodes.
J
Joern Engel 已提交
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 * I_WILL_FREE		Must be set when calling write_inode_now() if i_count
 *			is zero.  I_FREEING must be set when I_WILL_FREE is
 *			cleared.
 * I_FREEING		Set when inode is about to be freed but still has dirty
 *			pages or buffers attached or the inode itself is still
 *			dirty.
1678
 * I_CLEAR		Added by end_writeback().  In this state the inode is clean
A
Al Viro 已提交
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 *			and can be destroyed.  Inode keeps I_FREEING.
J
Joern Engel 已提交
1680 1681 1682 1683 1684
 *
 *			Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are
 *			prohibited for many purposes.  iget() must wait for
 *			the inode to be completely released, then create it
 *			anew.  Other functions will just ignore such inodes,
C
Christoph Hellwig 已提交
1685
 *			if appropriate.  I_NEW is used for waiting.
J
Joern Engel 已提交
1686
 *
C
Christoph Hellwig 已提交
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 * I_SYNC		Synchonized write of dirty inode data.  The bits is
 *			set during data writeback, and cleared with a wakeup
 *			on the bit address once it is done.
J
Joern Engel 已提交
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 *
 * Q: What is the difference between I_WILL_FREE and I_FREEING?
 */
1693 1694 1695
#define I_DIRTY_SYNC		(1 << 0)
#define I_DIRTY_DATASYNC	(1 << 1)
#define I_DIRTY_PAGES		(1 << 2)
C
Christoph Hellwig 已提交
1696 1697
#define __I_NEW			3
#define I_NEW			(1 << __I_NEW)
1698 1699 1700
#define I_WILL_FREE		(1 << 4)
#define I_FREEING		(1 << 5)
#define I_CLEAR			(1 << 6)
C
Christoph Hellwig 已提交
1701
#define __I_SYNC		7
J
Joern Engel 已提交
1702
#define I_SYNC			(1 << __I_SYNC)
1703
#define I_REFERENCED		(1 << 8)
L
Linus Torvalds 已提交
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#define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)

extern void __mark_inode_dirty(struct inode *, int);
static inline void mark_inode_dirty(struct inode *inode)
{
	__mark_inode_dirty(inode, I_DIRTY);
}

static inline void mark_inode_dirty_sync(struct inode *inode)
{
	__mark_inode_dirty(inode, I_DIRTY_SYNC);
}

D
Dave Hansen 已提交
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/**
 * inc_nlink - directly increment an inode's link count
 * @inode: inode
 *
 * This is a low-level filesystem helper to replace any
 * direct filesystem manipulation of i_nlink.  Currently,
 * it is only here for parity with dec_nlink().
 */
1726
static inline void inc_nlink(struct inode *inode)
1727 1728
{
	inode->i_nlink++;
1729 1730 1731 1732 1733
}

static inline void inode_inc_link_count(struct inode *inode)
{
	inc_nlink(inode);
1734 1735 1736
	mark_inode_dirty(inode);
}

D
Dave Hansen 已提交
1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747
/**
 * drop_nlink - directly drop an inode's link count
 * @inode: inode
 *
 * This is a low-level filesystem helper to replace any
 * direct filesystem manipulation of i_nlink.  In cases
 * where we are attempting to track writes to the
 * filesystem, a decrement to zero means an imminent
 * write when the file is truncated and actually unlinked
 * on the filesystem.
 */
1748
static inline void drop_nlink(struct inode *inode)
1749 1750
{
	inode->i_nlink--;
1751 1752
}

D
Dave Hansen 已提交
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/**
 * clear_nlink - directly zero an inode's link count
 * @inode: inode
 *
 * This is a low-level filesystem helper to replace any
 * direct filesystem manipulation of i_nlink.  See
 * drop_nlink() for why we care about i_nlink hitting zero.
 */
1761 1762 1763 1764 1765
static inline void clear_nlink(struct inode *inode)
{
	inode->i_nlink = 0;
}

1766 1767 1768
static inline void inode_dec_link_count(struct inode *inode)
{
	drop_nlink(inode);
1769 1770 1771
	mark_inode_dirty(inode);
}

1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786
/**
 * inode_inc_iversion - increments i_version
 * @inode: inode that need to be updated
 *
 * Every time the inode is modified, the i_version field will be incremented.
 * The filesystem has to be mounted with i_version flag
 */

static inline void inode_inc_iversion(struct inode *inode)
{
       spin_lock(&inode->i_lock);
       inode->i_version++;
       spin_unlock(&inode->i_lock);
}

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Christoph Hellwig 已提交
1787
extern void touch_atime(struct vfsmount *mnt, struct dentry *dentry);
L
Linus Torvalds 已提交
1788 1789 1790
static inline void file_accessed(struct file *file)
{
	if (!(file->f_flags & O_NOATIME))
1791
		touch_atime(file->f_path.mnt, file->f_path.dentry);
L
Linus Torvalds 已提交
1792 1793 1794
}

int sync_inode(struct inode *inode, struct writeback_control *wbc);
C
Christoph Hellwig 已提交
1795
int sync_inode_metadata(struct inode *inode, int wait);
L
Linus Torvalds 已提交
1796 1797 1798 1799

struct file_system_type {
	const char *name;
	int fs_flags;
A
Al Viro 已提交
1800 1801
	struct dentry *(*mount) (struct file_system_type *, int,
		       const char *, void *);
L
Linus Torvalds 已提交
1802 1803 1804 1805
	void (*kill_sb) (struct super_block *);
	struct module *owner;
	struct file_system_type * next;
	struct list_head fs_supers;
1806

I
Ingo Molnar 已提交
1807
	struct lock_class_key s_lock_key;
1808
	struct lock_class_key s_umount_key;
1809
	struct lock_class_key s_vfs_rename_key;
1810 1811 1812

	struct lock_class_key i_lock_key;
	struct lock_class_key i_mutex_key;
1813
	struct lock_class_key i_mutex_dir_key;
1814
	struct lock_class_key i_alloc_sem_key;
L
Linus Torvalds 已提交
1815 1816
};

A
Al Viro 已提交
1817 1818
extern struct dentry *mount_ns(struct file_system_type *fs_type, int flags,
	void *data, int (*fill_super)(struct super_block *, void *, int));
A
Al Viro 已提交
1819 1820 1821
extern struct dentry *mount_bdev(struct file_system_type *fs_type,
	int flags, const char *dev_name, void *data,
	int (*fill_super)(struct super_block *, void *, int));
A
Al Viro 已提交
1822 1823 1824
extern struct dentry *mount_single(struct file_system_type *fs_type,
	int flags, void *data,
	int (*fill_super)(struct super_block *, void *, int));
A
Al Viro 已提交
1825 1826 1827
extern struct dentry *mount_nodev(struct file_system_type *fs_type,
	int flags, void *data,
	int (*fill_super)(struct super_block *, void *, int));
L
Linus Torvalds 已提交
1828 1829 1830 1831 1832
void generic_shutdown_super(struct super_block *sb);
void kill_block_super(struct super_block *sb);
void kill_anon_super(struct super_block *sb);
void kill_litter_super(struct super_block *sb);
void deactivate_super(struct super_block *sb);
A
Al Viro 已提交
1833
void deactivate_locked_super(struct super_block *sb);
L
Linus Torvalds 已提交
1834 1835 1836 1837 1838
int set_anon_super(struct super_block *s, void *data);
struct super_block *sget(struct file_system_type *type,
			int (*test)(struct super_block *,void *),
			int (*set)(struct super_block *,void *),
			void *data);
A
Al Viro 已提交
1839
extern struct dentry *mount_pseudo(struct file_system_type *, char *,
1840 1841 1842
	const struct super_operations *ops,
	const struct dentry_operations *dops,
	unsigned long);
L
Linus Torvalds 已提交
1843

1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856
static inline void sb_mark_dirty(struct super_block *sb)
{
	sb->s_dirt = 1;
}
static inline void sb_mark_clean(struct super_block *sb)
{
	sb->s_dirt = 0;
}
static inline int sb_is_dirty(struct super_block *sb)
{
	return sb->s_dirt;
}

L
Linus Torvalds 已提交
1857 1858 1859 1860 1861 1862 1863 1864
/* Alas, no aliases. Too much hassle with bringing module.h everywhere */
#define fops_get(fops) \
	(((fops) && try_module_get((fops)->owner) ? (fops) : NULL))
#define fops_put(fops) \
	do { if (fops) module_put((fops)->owner); } while(0)

extern int register_filesystem(struct file_system_type *);
extern int unregister_filesystem(struct file_system_type *);
1865 1866
extern struct vfsmount *kern_mount_data(struct file_system_type *, void *data);
#define kern_mount(type) kern_mount_data(type, NULL)
L
Linus Torvalds 已提交
1867 1868 1869
extern int may_umount_tree(struct vfsmount *);
extern int may_umount(struct vfsmount *);
extern long do_mount(char *, char *, char *, unsigned long, void *);
A
Al Viro 已提交
1870
extern struct vfsmount *collect_mounts(struct path *);
1871
extern void drop_collected_mounts(struct vfsmount *);
A
Al Viro 已提交
1872 1873
extern int iterate_mounts(int (*)(struct vfsmount *, void *), void *,
			  struct vfsmount *);
1874
extern int vfs_statfs(struct path *, struct kstatfs *);
A
Al Viro 已提交
1875 1876
extern int user_statfs(const char __user *, struct kstatfs *);
extern int fd_statfs(int, struct kstatfs *);
1877
extern int statfs_by_dentry(struct dentry *, struct kstatfs *);
1878 1879
extern int freeze_super(struct super_block *super);
extern int thaw_super(struct super_block *super);
L
Linus Torvalds 已提交
1880

A
Al Viro 已提交
1881 1882
extern int current_umask(void);

M
Miklos Szeredi 已提交
1883
/* /sys/fs */
1884
extern struct kobject *fs_kobj;
M
Miklos Szeredi 已提交
1885

1886
#define MAX_RW_COUNT (INT_MAX & PAGE_CACHE_MASK)
1887 1888
extern int rw_verify_area(int, struct file *, loff_t *, size_t);

L
Linus Torvalds 已提交
1889 1890 1891
#define FLOCK_VERIFY_READ  1
#define FLOCK_VERIFY_WRITE 2

1892
#ifdef CONFIG_FILE_LOCKING
L
Linus Torvalds 已提交
1893 1894 1895 1896 1897 1898 1899
extern int locks_mandatory_locked(struct inode *);
extern int locks_mandatory_area(int, struct inode *, struct file *, loff_t, size_t);

/*
 * Candidates for mandatory locking have the setgid bit set
 * but no group execute bit -  an otherwise meaningless combination.
 */
1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914

static inline int __mandatory_lock(struct inode *ino)
{
	return (ino->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID;
}

/*
 * ... and these candidates should be on MS_MANDLOCK mounted fs,
 * otherwise these will be advisory locks
 */

static inline int mandatory_lock(struct inode *ino)
{
	return IS_MANDLOCK(ino) && __mandatory_lock(ino);
}
L
Linus Torvalds 已提交
1915 1916 1917

static inline int locks_verify_locked(struct inode *inode)
{
1918
	if (mandatory_lock(inode))
L
Linus Torvalds 已提交
1919 1920 1921 1922 1923 1924 1925 1926
		return locks_mandatory_locked(inode);
	return 0;
}

static inline int locks_verify_truncate(struct inode *inode,
				    struct file *filp,
				    loff_t size)
{
1927
	if (inode->i_flock && mandatory_lock(inode))
L
Linus Torvalds 已提交
1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942
		return locks_mandatory_area(
			FLOCK_VERIFY_WRITE, inode, filp,
			size < inode->i_size ? size : inode->i_size,
			(size < inode->i_size ? inode->i_size - size
			 : size - inode->i_size)
		);
	return 0;
}

static inline int break_lease(struct inode *inode, unsigned int mode)
{
	if (inode->i_flock)
		return __break_lease(inode, mode);
	return 0;
}
1943
#else /* !CONFIG_FILE_LOCKING */
1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981
static inline int locks_mandatory_locked(struct inode *inode)
{
	return 0;
}

static inline int locks_mandatory_area(int rw, struct inode *inode,
				       struct file *filp, loff_t offset,
				       size_t count)
{
	return 0;
}

static inline int __mandatory_lock(struct inode *inode)
{
	return 0;
}

static inline int mandatory_lock(struct inode *inode)
{
	return 0;
}

static inline int locks_verify_locked(struct inode *inode)
{
	return 0;
}

static inline int locks_verify_truncate(struct inode *inode, struct file *filp,
					size_t size)
{
	return 0;
}

static inline int break_lease(struct inode *inode, unsigned int mode)
{
	return 0;
}

1982
#endif /* CONFIG_FILE_LOCKING */
L
Linus Torvalds 已提交
1983 1984 1985

/* fs/open.c */

1986 1987
extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs,
		       struct file *filp);
1988 1989
extern int do_fallocate(struct file *file, int mode, loff_t offset,
			loff_t len);
J
Jason Uhlenkott 已提交
1990
extern long do_sys_open(int dfd, const char __user *filename, int flags,
1991
			int mode);
L
Linus Torvalds 已提交
1992
extern struct file *filp_open(const char *, int, int);
A
Al Viro 已提交
1993 1994
extern struct file *file_open_root(struct dentry *, struct vfsmount *,
				   const char *, int);
1995 1996
extern struct file * dentry_open(struct dentry *, struct vfsmount *, int,
				 const struct cred *);
L
Linus Torvalds 已提交
1997 1998 1999
extern int filp_close(struct file *, fl_owner_t id);
extern char * getname(const char __user *);

2000 2001 2002 2003
/* fs/ioctl.c */

extern int ioctl_preallocate(struct file *filp, void __user *argp);

L
Linus Torvalds 已提交
2004 2005 2006 2007
/* fs/dcache.c */
extern void __init vfs_caches_init_early(void);
extern void __init vfs_caches_init(unsigned long);

2008 2009
extern struct kmem_cache *names_cachep;

V
Vegard Nossum 已提交
2010 2011 2012
#define __getname_gfp(gfp)	kmem_cache_alloc(names_cachep, (gfp))
#define __getname()		__getname_gfp(GFP_KERNEL)
#define __putname(name)		kmem_cache_free(names_cachep, (void *)(name))
L
Linus Torvalds 已提交
2013 2014 2015 2016 2017 2018
#ifndef CONFIG_AUDITSYSCALL
#define putname(name)   __putname(name)
#else
extern void putname(const char *name);
#endif

2019
#ifdef CONFIG_BLOCK
L
Linus Torvalds 已提交
2020
extern int register_blkdev(unsigned int, const char *);
A
Akinobu Mita 已提交
2021
extern void unregister_blkdev(unsigned int, const char *);
L
Linus Torvalds 已提交
2022
extern struct block_device *bdget(dev_t);
2023
extern struct block_device *bdgrab(struct block_device *bdev);
L
Linus Torvalds 已提交
2024 2025 2026
extern void bd_set_size(struct block_device *, loff_t size);
extern void bd_forget(struct inode *inode);
extern void bdput(struct block_device *);
N
Nick Piggin 已提交
2027 2028 2029
extern void invalidate_bdev(struct block_device *);
extern int sync_blockdev(struct block_device *bdev);
extern struct super_block *freeze_bdev(struct block_device *);
2030
extern void emergency_thaw_all(void);
N
Nick Piggin 已提交
2031 2032
extern int thaw_bdev(struct block_device *bdev, struct super_block *sb);
extern int fsync_bdev(struct block_device *);
2033 2034
#else
static inline void bd_forget(struct inode *inode) {}
2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046
static inline int sync_blockdev(struct block_device *bdev) { return 0; }
static inline void invalidate_bdev(struct block_device *bdev) {}

static inline struct super_block *freeze_bdev(struct block_device *sb)
{
	return NULL;
}

static inline int thaw_bdev(struct block_device *bdev, struct super_block *sb)
{
	return 0;
}
2047
#endif
2048
extern int sync_filesystem(struct super_block *);
2049
extern const struct file_operations def_blk_fops;
2050 2051 2052
extern const struct file_operations def_chr_fops;
extern const struct file_operations bad_sock_fops;
extern const struct file_operations def_fifo_fops;
2053
#ifdef CONFIG_BLOCK
L
Linus Torvalds 已提交
2054
extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long);
2055
extern int blkdev_ioctl(struct block_device *, fmode_t, unsigned, unsigned long);
L
Linus Torvalds 已提交
2056
extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long);
2057
extern int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder);
2058 2059 2060 2061
extern struct block_device *blkdev_get_by_path(const char *path, fmode_t mode,
					       void *holder);
extern struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode,
					      void *holder);
2062
extern int blkdev_put(struct block_device *bdev, fmode_t mode);
2063
#ifdef CONFIG_SYSFS
2064
extern int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk);
2065 2066
extern void bd_unlink_disk_holder(struct block_device *bdev,
				  struct gendisk *disk);
2067
#else
2068 2069 2070 2071 2072
static inline int bd_link_disk_holder(struct block_device *bdev,
				      struct gendisk *disk)
{
	return 0;
}
2073 2074 2075 2076
static inline void bd_unlink_disk_holder(struct block_device *bdev,
					 struct gendisk *disk)
{
}
2077
#endif
2078
#endif
L
Linus Torvalds 已提交
2079 2080

/* fs/char_dev.c */
2081
#define CHRDEV_MAJOR_HASH_SIZE	255
L
Linus Torvalds 已提交
2082 2083
extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *);
extern int register_chrdev_region(dev_t, unsigned, const char *);
2084 2085 2086 2087 2088
extern int __register_chrdev(unsigned int major, unsigned int baseminor,
			     unsigned int count, const char *name,
			     const struct file_operations *fops);
extern void __unregister_chrdev(unsigned int major, unsigned int baseminor,
				unsigned int count, const char *name);
L
Linus Torvalds 已提交
2089
extern void unregister_chrdev_region(dev_t, unsigned);
2090
extern void chrdev_show(struct seq_file *,off_t);
L
Linus Torvalds 已提交
2091

2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102
static inline int register_chrdev(unsigned int major, const char *name,
				  const struct file_operations *fops)
{
	return __register_chrdev(major, 0, 256, name, fops);
}

static inline void unregister_chrdev(unsigned int major, const char *name)
{
	__unregister_chrdev(major, 0, 256, name);
}

L
Linus Torvalds 已提交
2103 2104
/* fs/block_dev.c */
#define BDEVNAME_SIZE	32	/* Largest string for a blockdev identifier */
2105
#define BDEVT_SIZE	10	/* Largest string for MAJ:MIN for blkdev */
2106 2107 2108

#ifdef CONFIG_BLOCK
#define BLKDEV_MAJOR_HASH_SIZE	255
L
Linus Torvalds 已提交
2109 2110 2111
extern const char *__bdevname(dev_t, char *buffer);
extern const char *bdevname(struct block_device *bdev, char *buffer);
extern struct block_device *lookup_bdev(const char *);
2112
extern void blkdev_show(struct seq_file *,off_t);
2113

2114 2115 2116
#else
#define BLKDEV_MAJOR_HASH_SIZE	0
#endif
L
Linus Torvalds 已提交
2117 2118 2119 2120 2121 2122 2123

extern void init_special_inode(struct inode *, umode_t, dev_t);

/* Invalid inode operations -- fs/bad_inode.c */
extern void make_bad_inode(struct inode *);
extern int is_bad_inode(struct inode *);

2124 2125 2126
extern const struct file_operations read_pipefifo_fops;
extern const struct file_operations write_pipefifo_fops;
extern const struct file_operations rdwr_pipefifo_fops;
L
Linus Torvalds 已提交
2127 2128 2129

extern int fs_may_remount_ro(struct super_block *);

2130
#ifdef CONFIG_BLOCK
L
Linus Torvalds 已提交
2131 2132 2133 2134 2135 2136 2137 2138 2139 2140
/*
 * return READ, READA, or WRITE
 */
#define bio_rw(bio)		((bio)->bi_rw & (RW_MASK | RWA_MASK))

/*
 * return data direction, READ or WRITE
 */
#define bio_data_dir(bio)	((bio)->bi_rw & 1)

2141 2142
extern void check_disk_size_change(struct gendisk *disk,
				   struct block_device *bdev);
2143
extern int revalidate_disk(struct gendisk *);
L
Linus Torvalds 已提交
2144
extern int check_disk_change(struct block_device *);
2145
extern int __invalidate_device(struct block_device *, bool);
L
Linus Torvalds 已提交
2146
extern int invalidate_partition(struct gendisk *, int);
2147
#endif
L
Linus Torvalds 已提交
2148 2149
unsigned long invalidate_mapping_pages(struct address_space *mapping,
					pgoff_t start, pgoff_t end);
2150

L
Linus Torvalds 已提交
2151 2152 2153 2154
static inline void invalidate_remote_inode(struct inode *inode)
{
	if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
	    S_ISLNK(inode->i_mode))
2155
		invalidate_mapping_pages(inode->i_mapping, 0, -1);
L
Linus Torvalds 已提交
2156 2157 2158 2159 2160 2161 2162 2163
}
extern int invalidate_inode_pages2(struct address_space *mapping);
extern int invalidate_inode_pages2_range(struct address_space *mapping,
					 pgoff_t start, pgoff_t end);
extern int write_inode_now(struct inode *, int);
extern int filemap_fdatawrite(struct address_space *);
extern int filemap_flush(struct address_space *);
extern int filemap_fdatawait(struct address_space *);
2164 2165
extern int filemap_fdatawait_range(struct address_space *, loff_t lstart,
				   loff_t lend);
L
Linus Torvalds 已提交
2166 2167 2168
extern int filemap_write_and_wait(struct address_space *mapping);
extern int filemap_write_and_wait_range(struct address_space *mapping,
				        loff_t lstart, loff_t lend);
2169 2170
extern int __filemap_fdatawrite_range(struct address_space *mapping,
				loff_t start, loff_t end, int sync_mode);
2171 2172
extern int filemap_fdatawrite_range(struct address_space *mapping,
				loff_t start, loff_t end);
2173

2174 2175 2176
extern int vfs_fsync_range(struct file *file, loff_t start, loff_t end,
			   int datasync);
extern int vfs_fsync(struct file *file, int datasync);
2177
extern int generic_write_sync(struct file *file, loff_t pos, loff_t count);
L
Linus Torvalds 已提交
2178 2179 2180
extern void sync_supers(void);
extern void emergency_sync(void);
extern void emergency_remount(void);
2181
#ifdef CONFIG_BLOCK
L
Linus Torvalds 已提交
2182
extern sector_t bmap(struct inode *, sector_t);
2183
#endif
L
Linus Torvalds 已提交
2184
extern int notify_change(struct dentry *, struct iattr *);
2185
extern int inode_permission(struct inode *, int);
2186 2187
extern int generic_permission(struct inode *, int, unsigned int,
		int (*check_acl)(struct inode *, int, unsigned int));
L
Linus Torvalds 已提交
2188

2189 2190 2191 2192 2193
static inline bool execute_ok(struct inode *inode)
{
	return (inode->i_mode & S_IXUGO) || S_ISDIR(inode->i_mode);
}

L
Linus Torvalds 已提交
2194 2195 2196 2197 2198 2199 2200 2201 2202
extern int get_write_access(struct inode *);
extern int deny_write_access(struct file *);
static inline void put_write_access(struct inode * inode)
{
	atomic_dec(&inode->i_writecount);
}
static inline void allow_write_access(struct file *file)
{
	if (file)
2203
		atomic_inc(&file->f_path.dentry->d_inode->i_writecount);
L
Linus Torvalds 已提交
2204
}
M
Mimi Zohar 已提交
2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224
#ifdef CONFIG_IMA
static inline void i_readcount_dec(struct inode *inode)
{
	BUG_ON(!atomic_read(&inode->i_readcount));
	atomic_dec(&inode->i_readcount);
}
static inline void i_readcount_inc(struct inode *inode)
{
	atomic_inc(&inode->i_readcount);
}
#else
static inline void i_readcount_dec(struct inode *inode)
{
	return;
}
static inline void i_readcount_inc(struct inode *inode)
{
	return;
}
#endif
U
Ulrich Drepper 已提交
2225
extern int do_pipe_flags(int *, int);
2226 2227
extern struct file *create_read_pipe(struct file *f, int flags);
extern struct file *create_write_pipe(int flags);
A
Andi Kleen 已提交
2228
extern void free_write_pipe(struct file *);
L
Linus Torvalds 已提交
2229

M
Mimi Zohar 已提交
2230
extern int kernel_read(struct file *, loff_t, char *, unsigned long);
L
Linus Torvalds 已提交
2231 2232 2233 2234
extern struct file * open_exec(const char *);
 
/* fs/dcache.c -- generic fs support functions */
extern int is_subdir(struct dentry *, struct dentry *);
2235
extern int path_is_under(struct path *, struct path *);
L
Linus Torvalds 已提交
2236 2237 2238 2239 2240 2241 2242 2243 2244
extern ino_t find_inode_number(struct dentry *, struct qstr *);

#include <linux/err.h>

/* needed for stackable file system support */
extern loff_t default_llseek(struct file *file, loff_t offset, int origin);

extern loff_t vfs_llseek(struct file *file, loff_t offset, int origin);

2245
extern int inode_init_always(struct super_block *, struct inode *);
L
Linus Torvalds 已提交
2246
extern void inode_init_once(struct inode *);
2247
extern void address_space_init_once(struct address_space *mapping);
A
Al Viro 已提交
2248
extern void ihold(struct inode * inode);
L
Linus Torvalds 已提交
2249 2250 2251 2252
extern void iput(struct inode *);
extern struct inode * igrab(struct inode *);
extern ino_t iunique(struct super_block *, ino_t);
extern int inode_needs_sync(struct inode *inode);
2253 2254
extern int generic_delete_inode(struct inode *inode);
extern int generic_drop_inode(struct inode *inode);
L
Linus Torvalds 已提交
2255

2256 2257 2258
extern struct inode *ilookup5_nowait(struct super_block *sb,
		unsigned long hashval, int (*test)(struct inode *, void *),
		void *data);
L
Linus Torvalds 已提交
2259 2260 2261 2262 2263 2264
extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval,
		int (*test)(struct inode *, void *), void *data);
extern struct inode *ilookup(struct super_block *sb, unsigned long ino);

extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *);
extern struct inode * iget_locked(struct super_block *, unsigned long);
A
Al Viro 已提交
2265 2266
extern int insert_inode_locked4(struct inode *, unsigned long, int (*test)(struct inode *, void *), void *);
extern int insert_inode_locked(struct inode *);
L
Linus Torvalds 已提交
2267
extern void unlock_new_inode(struct inode *);
2268
extern unsigned int get_next_ino(void);
L
Linus Torvalds 已提交
2269 2270

extern void __iget(struct inode * inode);
2271
extern void iget_failed(struct inode *);
A
Al Viro 已提交
2272
extern void end_writeback(struct inode *);
C
Christoph Hellwig 已提交
2273
extern void __destroy_inode(struct inode *);
L
Linus Torvalds 已提交
2274
extern struct inode *new_inode(struct super_block *);
2275
extern void free_inode_nonrcu(struct inode *inode);
2276
extern int should_remove_suid(struct dentry *);
2277
extern int file_remove_suid(struct file *);
L
Linus Torvalds 已提交
2278 2279 2280

extern void __insert_inode_hash(struct inode *, unsigned long hashval);
extern void remove_inode_hash(struct inode *);
2281 2282
static inline void insert_inode_hash(struct inode *inode)
{
L
Linus Torvalds 已提交
2283 2284
	__insert_inode_hash(inode, inode->i_ino);
}
2285
extern void inode_sb_list_add(struct inode *inode);
L
Linus Torvalds 已提交
2286

2287
#ifdef CONFIG_BLOCK
L
Linus Torvalds 已提交
2288 2289
extern void submit_bio(int, struct bio *);
extern int bdev_read_only(struct block_device *);
2290
#endif
L
Linus Torvalds 已提交
2291 2292 2293 2294 2295 2296 2297 2298
extern int set_blocksize(struct block_device *, int);
extern int sb_set_blocksize(struct super_block *, int);
extern int sb_min_blocksize(struct super_block *, int);

extern int generic_file_mmap(struct file *, struct vm_area_struct *);
extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *);
extern int file_read_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size);
int generic_write_checks(struct file *file, loff_t *pos, size_t *count, int isblk);
2299
extern ssize_t generic_file_aio_read(struct kiocb *, const struct iovec *, unsigned long, loff_t);
2300 2301
extern ssize_t __generic_file_aio_write(struct kiocb *, const struct iovec *, unsigned long,
		loff_t *);
2302
extern ssize_t generic_file_aio_write(struct kiocb *, const struct iovec *, unsigned long, loff_t);
L
Linus Torvalds 已提交
2303 2304 2305 2306 2307 2308
extern ssize_t generic_file_direct_write(struct kiocb *, const struct iovec *,
		unsigned long *, loff_t, loff_t *, size_t, size_t);
extern ssize_t generic_file_buffered_write(struct kiocb *, const struct iovec *,
		unsigned long, loff_t, loff_t *, size_t, ssize_t);
extern ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos);
extern ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos);
2309 2310
extern int generic_segment_checks(const struct iovec *iov,
		unsigned long *nr_segs, size_t *count, int access_flags);
A
Andrew Morton 已提交
2311

2312 2313 2314
/* fs/block_dev.c */
extern ssize_t blkdev_aio_write(struct kiocb *iocb, const struct iovec *iov,
				unsigned long nr_segs, loff_t pos);
2315
extern int blkdev_fsync(struct file *filp, int datasync);
2316

A
Andrew Morton 已提交
2317
/* fs/splice.c */
2318
extern ssize_t generic_file_splice_read(struct file *, loff_t *,
A
Andrew Morton 已提交
2319
		struct pipe_inode_info *, size_t, unsigned int);
2320 2321
extern ssize_t default_file_splice_read(struct file *, loff_t *,
		struct pipe_inode_info *, size_t, unsigned int);
A
Andrew Morton 已提交
2322
extern ssize_t generic_file_splice_write(struct pipe_inode_info *,
2323
		struct file *, loff_t *, size_t, unsigned int);
A
Andrew Morton 已提交
2324
extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe,
2325 2326
		struct file *out, loff_t *, size_t len, unsigned int flags);
extern long do_splice_direct(struct file *in, loff_t *ppos, struct file *out,
A
Andrew Morton 已提交
2327 2328
		size_t len, unsigned int flags);

L
Linus Torvalds 已提交
2329 2330
extern void
file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping);
J
jan Blunck 已提交
2331
extern loff_t noop_llseek(struct file *file, loff_t offset, int origin);
L
Linus Torvalds 已提交
2332 2333
extern loff_t no_llseek(struct file *file, loff_t offset, int origin);
extern loff_t generic_file_llseek(struct file *file, loff_t offset, int origin);
A
Andi Kleen 已提交
2334 2335
extern loff_t generic_file_llseek_unlocked(struct file *file, loff_t offset,
			int origin);
L
Linus Torvalds 已提交
2336 2337 2338
extern int generic_file_open(struct inode * inode, struct file * filp);
extern int nonseekable_open(struct inode * inode, struct file * filp);

2339
#ifdef CONFIG_FS_XIP
2340 2341
extern ssize_t xip_file_read(struct file *filp, char __user *buf, size_t len,
			     loff_t *ppos);
2342
extern int xip_file_mmap(struct file * file, struct vm_area_struct * vma);
2343 2344
extern ssize_t xip_file_write(struct file *filp, const char __user *buf,
			      size_t len, loff_t *ppos);
2345
extern int xip_truncate_page(struct address_space *mapping, loff_t from);
2346 2347 2348 2349 2350
#else
static inline int xip_truncate_page(struct address_space *mapping, loff_t from)
{
	return 0;
}
2351 2352
#endif

2353
#ifdef CONFIG_BLOCK
2354 2355
typedef void (dio_submit_t)(int rw, struct bio *bio, struct inode *inode,
			    loff_t file_offset);
L
Linus Torvalds 已提交
2356 2357

enum {
2358 2359 2360 2361 2362
	/* need locking between buffered and direct access */
	DIO_LOCKING	= 0x01,

	/* filesystem does not support filling holes */
	DIO_SKIP_HOLES	= 0x02,
L
Linus Torvalds 已提交
2363 2364
};

2365 2366 2367 2368 2369 2370
void dio_end_io(struct bio *bio, int error);

ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
	struct block_device *bdev, const struct iovec *iov, loff_t offset,
	unsigned long nr_segs, get_block_t get_block, dio_iodone_t end_io,
	dio_submit_t submit_io,	int flags);
2371

L
Linus Torvalds 已提交
2372 2373
static inline ssize_t blockdev_direct_IO(int rw, struct kiocb *iocb,
	struct inode *inode, struct block_device *bdev, const struct iovec *iov,
2374
	loff_t offset, unsigned long nr_segs, get_block_t get_block,
L
Linus Torvalds 已提交
2375 2376 2377
	dio_iodone_t end_io)
{
	return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
2378
				    nr_segs, get_block, end_io, NULL,
2379
				    DIO_LOCKING | DIO_SKIP_HOLES);
L
Linus Torvalds 已提交
2380
}
2381
#endif
L
Linus Torvalds 已提交
2382

2383
extern const struct file_operations generic_ro_fops;
L
Linus Torvalds 已提交
2384 2385 2386 2387 2388 2389

#define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))

extern int vfs_readlink(struct dentry *, char __user *, int, const char *);
extern int vfs_follow_link(struct nameidata *, const char *);
extern int page_readlink(struct dentry *, char __user *, int);
2390 2391
extern void *page_follow_link_light(struct dentry *, struct nameidata *);
extern void page_put_link(struct dentry *, struct nameidata *, void *);
2392
extern int __page_symlink(struct inode *inode, const char *symname, int len,
2393
		int nofs);
L
Linus Torvalds 已提交
2394
extern int page_symlink(struct inode *inode, const char *symname, int len);
2395
extern const struct inode_operations page_symlink_inode_operations;
L
Linus Torvalds 已提交
2396 2397 2398
extern int generic_readlink(struct dentry *, char __user *, int);
extern void generic_fillattr(struct inode *, struct kstat *);
extern int vfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
2399
void __inode_add_bytes(struct inode *inode, loff_t bytes);
L
Linus Torvalds 已提交
2400 2401 2402 2403 2404 2405 2406
void inode_add_bytes(struct inode *inode, loff_t bytes);
void inode_sub_bytes(struct inode *inode, loff_t bytes);
loff_t inode_get_bytes(struct inode *inode);
void inode_set_bytes(struct inode *inode, loff_t bytes);

extern int vfs_readdir(struct file *, filldir_t, void *);

2407 2408
extern int vfs_stat(const char __user *, struct kstat *);
extern int vfs_lstat(const char __user *, struct kstat *);
L
Linus Torvalds 已提交
2409
extern int vfs_fstat(unsigned int, struct kstat *);
2410
extern int vfs_fstatat(int , const char __user *, struct kstat *, int);
L
Linus Torvalds 已提交
2411

2412 2413
extern int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
		    unsigned long arg);
2414
extern int __generic_block_fiemap(struct inode *inode,
J
Josef Bacik 已提交
2415 2416 2417
				  struct fiemap_extent_info *fieinfo,
				  loff_t start, loff_t len,
				  get_block_t *get_block);
2418 2419 2420
extern int generic_block_fiemap(struct inode *inode,
				struct fiemap_extent_info *fieinfo, u64 start,
				u64 len, get_block_t *get_block);
L
Linus Torvalds 已提交
2421

2422 2423
extern void get_filesystem(struct file_system_type *fs);
extern void put_filesystem(struct file_system_type *fs);
L
Linus Torvalds 已提交
2424 2425
extern struct file_system_type *get_fs_type(const char *name);
extern struct super_block *get_super(struct block_device *);
2426
extern struct super_block *get_active_super(struct block_device *bdev);
L
Linus Torvalds 已提交
2427 2428
extern struct super_block *user_get_super(dev_t);
extern void drop_super(struct super_block *sb);
A
Al Viro 已提交
2429
extern void iterate_supers(void (*)(struct super_block *, void *), void *);
L
Linus Torvalds 已提交
2430 2431 2432 2433 2434

extern int dcache_dir_open(struct inode *, struct file *);
extern int dcache_dir_close(struct inode *, struct file *);
extern loff_t dcache_dir_lseek(struct file *, loff_t, int);
extern int dcache_readdir(struct file *, void *, filldir_t);
2435
extern int simple_setattr(struct dentry *, struct iattr *);
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Linus Torvalds 已提交
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extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *);
2437
extern int simple_statfs(struct dentry *, struct kstatfs *);
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extern int simple_link(struct dentry *, struct inode *, struct dentry *);
extern int simple_unlink(struct inode *, struct dentry *);
extern int simple_rmdir(struct inode *, struct dentry *);
extern int simple_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
2442
extern int noop_fsync(struct file *, int);
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Linus Torvalds 已提交
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extern int simple_empty(struct dentry *);
extern int simple_readpage(struct file *file, struct page *page);
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extern int simple_write_begin(struct file *file, struct address_space *mapping,
			loff_t pos, unsigned len, unsigned flags,
			struct page **pagep, void **fsdata);
extern int simple_write_end(struct file *file, struct address_space *mapping,
			loff_t pos, unsigned len, unsigned copied,
			struct page *page, void *fsdata);
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extern struct dentry *simple_lookup(struct inode *, struct dentry *, struct nameidata *);
extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *);
2454
extern const struct file_operations simple_dir_operations;
2455
extern const struct inode_operations simple_dir_inode_operations;
2456
struct tree_descr { char *name; const struct file_operations *ops; int mode; };
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Linus Torvalds 已提交
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struct dentry *d_alloc_name(struct dentry *, const char *);
2458
extern int simple_fill_super(struct super_block *, unsigned long, struct tree_descr *);
2459
extern int simple_pin_fs(struct file_system_type *, struct vfsmount **mount, int *count);
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extern void simple_release_fs(struct vfsmount **mount, int *count);

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extern ssize_t simple_read_from_buffer(void __user *to, size_t count,
			loff_t *ppos, const void *from, size_t available);
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extern ssize_t simple_write_to_buffer(void *to, size_t available, loff_t *ppos,
		const void __user *from, size_t count);
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Linus Torvalds 已提交
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2467
extern int generic_file_fsync(struct file *, int);
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Al Viro 已提交
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2469 2470
extern int generic_check_addressable(unsigned, u64);

2471
#ifdef CONFIG_MIGRATION
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extern int buffer_migrate_page(struct address_space *,
				struct page *, struct page *);
2474 2475 2476 2477
#else
#define buffer_migrate_page NULL
#endif

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npiggin@suse.de 已提交
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extern int inode_change_ok(const struct inode *, struct iattr *);
extern int inode_newsize_ok(const struct inode *, loff_t offset);
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Christoph Hellwig 已提交
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extern void setattr_copy(struct inode *inode, const struct iattr *attr);
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2482
extern void file_update_time(struct file *file);
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2484 2485
extern int generic_show_options(struct seq_file *m, struct vfsmount *mnt);
extern void save_mount_options(struct super_block *sb, char *options);
2486
extern void replace_mount_options(struct super_block *sb, char *options);
2487

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Linus Torvalds 已提交
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static inline ino_t parent_ino(struct dentry *dentry)
{
	ino_t res;

N
Nick Piggin 已提交
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	/*
	 * Don't strictly need d_lock here? If the parent ino could change
	 * then surely we'd have a deeper race in the caller?
	 */
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	spin_lock(&dentry->d_lock);
	res = dentry->d_parent->d_inode->i_ino;
	spin_unlock(&dentry->d_lock);
	return res;
}

/* Transaction based IO helpers */

/*
 * An argresp is stored in an allocated page and holds the
 * size of the argument or response, along with its content
 */
struct simple_transaction_argresp {
	ssize_t size;
	char data[0];
};

#define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp))

char *simple_transaction_get(struct file *file, const char __user *buf,
				size_t size);
ssize_t simple_transaction_read(struct file *file, char __user *buf,
				size_t size, loff_t *pos);
int simple_transaction_release(struct inode *inode, struct file *file);

2521
void simple_transaction_set(struct file *file, size_t n);
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Linus Torvalds 已提交
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2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544
/*
 * simple attribute files
 *
 * These attributes behave similar to those in sysfs:
 *
 * Writing to an attribute immediately sets a value, an open file can be
 * written to multiple times.
 *
 * Reading from an attribute creates a buffer from the value that might get
 * read with multiple read calls. When the attribute has been read
 * completely, no further read calls are possible until the file is opened
 * again.
 *
 * All attributes contain a text representation of a numeric value
 * that are accessed with the get() and set() functions.
 */
#define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt)		\
static int __fops ## _open(struct inode *inode, struct file *file)	\
{									\
	__simple_attr_check_format(__fmt, 0ull);			\
	return simple_attr_open(inode, file, __get, __set, __fmt);	\
}									\
2545
static const struct file_operations __fops = {				\
2546 2547
	.owner	 = THIS_MODULE,						\
	.open	 = __fops ## _open,					\
2548
	.release = simple_attr_release,					\
2549 2550
	.read	 = simple_attr_read,					\
	.write	 = simple_attr_write,					\
2551
	.llseek	 = generic_file_llseek,					\
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};

static inline void __attribute__((format(printf, 1, 2)))
__simple_attr_check_format(const char *fmt, ...)
{
	/* don't do anything, just let the compiler check the arguments; */
}

int simple_attr_open(struct inode *inode, struct file *file,
2561
		     int (*get)(void *, u64 *), int (*set)(void *, u64),
2562
		     const char *fmt);
2563
int simple_attr_release(struct inode *inode, struct file *file);
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ssize_t simple_attr_read(struct file *file, char __user *buf,
			 size_t len, loff_t *ppos);
ssize_t simple_attr_write(struct file *file, const char __user *buf,
			  size_t len, loff_t *ppos);

A
Alexey Dobriyan 已提交
2569
struct ctl_table;
2570
int proc_nr_files(struct ctl_table *table, int write,
2571
		  void __user *buffer, size_t *lenp, loff_t *ppos);
2572 2573
int proc_nr_dentry(struct ctl_table *table, int write,
		  void __user *buffer, size_t *lenp, loff_t *ppos);
2574 2575
int proc_nr_inodes(struct ctl_table *table, int write,
		   void __user *buffer, size_t *lenp, loff_t *ppos);
2576
int __init get_filesystem_list(char *buf);
2577

N
Namhyung Kim 已提交
2578
#define __FMODE_EXEC		((__force int) FMODE_EXEC)
2579 2580
#define __FMODE_NONOTIFY	((__force int) FMODE_NONOTIFY)

A
Al Viro 已提交
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#define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE])
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Eric Paris 已提交
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#define OPEN_FMODE(flag) ((__force fmode_t)(((flag + 1) & O_ACCMODE) | \
2583
					    (flag & __FMODE_NONOTIFY)))
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L
Linus Torvalds 已提交
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#endif /* __KERNEL__ */
#endif /* _LINUX_FS_H */