fs.h 91.3 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_DATA	3	/* seek to the next data */
#define SEEK_HOLE	4	/* seek to the next hole */
#define SEEK_MAX	SEEK_HOLE
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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 */

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#define MAY_EXEC		0x00000001
#define MAY_WRITE		0x00000002
#define MAY_READ		0x00000004
#define MAY_APPEND		0x00000008
#define MAY_ACCESS		0x00000010
#define MAY_OPEN		0x00000020
#define MAY_CHDIR		0x00000040
/* called from RCU mode, don't block */
#define MAY_NOT_BLOCK		0x00000080
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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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/* 32bit hashes as llseek() offset (for directories) */
#define FMODE_32BITHASH         ((__force fmode_t)0x200)
/* 64bit hashes as llseek() offset (for directories) */
#define FMODE_64BITHASH         ((__force fmode_t)0x400)
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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)
#define WRITE_SYNC		(WRITE | REQ_SYNC | REQ_NOIDLE)
#define WRITE_ODIRECT		(WRITE | REQ_SYNC)
#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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/*
 * Flag for rw_copy_check_uvector and compat_rw_copy_check_uvector
 * that indicates that they should check the contents of the iovec are
 * valid, but not check the memory that the iovec elements
 * points too.
 */
#define CHECK_IOVEC_ONLY -1

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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_NOSEC	(1<<28)
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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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#define S_NOSEC		4096	/* no suid or xattr security attributes */
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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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#define IS_NOSEC(inode)		((inode)->i_flags & S_NOSEC)
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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 BLKROTATIONAL _IO(0x12,126)
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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/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/bug.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 <linux/atomic.h>
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#include <linux/shrinker.h>
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#include <linux/migrate_mode.h>
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#include <linux/uidgid.h>
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#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;
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	kuid_t		ia_uid;
	kgid_t		ia_gid;
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	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. If sync
	 * is false, it must not block.
	 */
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	int (*migratepage) (struct address_space *,
634
			struct page *, struct page *, enum migrate_mode);
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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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	/* Protected by tree_lock together with the radix tree */
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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.
	 */
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struct request_queue;
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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;
686
	struct mutex		bd_mutex;	/* open/close mutex */
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	struct list_head	bd_inodes;
688
	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;
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	struct request_queue *  bd_queue;
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	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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#define IOP_FASTPERM	0x0001
#define IOP_LOOKUP	0x0002
#define IOP_NOFOLLOW	0x0004

/*
 * Keep mostly read-only and often accessed (especially for
 * the RCU path lookup and 'stat' data) fields at the beginning
 * of the 'struct inode'
 */
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struct inode {
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	umode_t			i_mode;
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	unsigned short		i_opflags;
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	kuid_t			i_uid;
	kgid_t			i_gid;
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	unsigned int		i_flags;

#ifdef CONFIG_FS_POSIX_ACL
	struct posix_acl	*i_acl;
	struct posix_acl	*i_default_acl;
#endif

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	const struct inode_operations	*i_op;
	struct super_block	*i_sb;
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	struct address_space	*i_mapping;
786

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#ifdef CONFIG_SECURITY
	void			*i_security;
#endif
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	/* Stat data, not accessed from path walking */
	unsigned long		i_ino;
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	/*
	 * Filesystems may only read i_nlink directly.  They shall use the
	 * following functions for modification:
	 *
	 *    (set|clear|inc|drop)_nlink
	 *    inode_(inc|dec)_link_count
	 */
	union {
		const unsigned int i_nlink;
		unsigned int __i_nlink;
	};
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	dev_t			i_rdev;
805
	loff_t			i_size;
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	struct timespec		i_atime;
	struct timespec		i_mtime;
	struct timespec		i_ctime;
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	spinlock_t		i_lock;	/* i_blocks, i_bytes, maybe i_size */
	unsigned short          i_bytes;
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	unsigned int		i_blkbits;
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	blkcnt_t		i_blocks;

#ifdef __NEED_I_SIZE_ORDERED
	seqcount_t		i_size_seqcount;
#endif

	/* Misc */
	unsigned long		i_state;
	struct mutex		i_mutex;
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	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 {
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		struct hlist_head	i_dentry;
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		struct rcu_head		i_rcu;
	};
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	u64			i_version;
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	atomic_t		i_count;
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	atomic_t		i_dio_count;
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	atomic_t		i_writecount;
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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_data;
#ifdef CONFIG_QUOTA
	struct dquot		*i_dquot[MAXQUOTAS];
#endif
	struct list_head	i_devices;
843 844
	union {
		struct pipe_inode_info	*i_pipe;
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		struct block_device	*i_bdev;
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		struct cdev		*i_cdev;
847
	};
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	__u32			i_generation;

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#ifdef CONFIG_FSNOTIFY
	__u32			i_fsnotify_mask; /* all events this inode cares about */
853
	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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	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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/* Helper functions so that in most cases filesystems will
 * not need to deal directly with kuid_t and kgid_t and can
 * instead deal with the raw numeric values that are stored
 * in the filesystem.
 */
static inline uid_t i_uid_read(const struct inode *inode)
{
	return from_kuid(&init_user_ns, inode->i_uid);
}

static inline gid_t i_gid_read(const struct inode *inode)
{
	return from_kgid(&init_user_ns, inode->i_gid);
}

static inline void i_uid_write(struct inode *inode, uid_t uid)
{
	inode->i_uid = make_kuid(&init_user_ns, uid);
}

static inline void i_gid_write(struct inode *inode, gid_t gid)
{
	inode->i_gid = make_kgid(&init_user_ns, gid);
}

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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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	kuid_t uid, euid;	/* uid/euid of process setting the owner */
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	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
992
					   there are only # of pages ahead */
993

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	unsigned int ra_pages;		/* Maximum readahead window */
995
	unsigned int mmap_miss;		/* Cache miss stat for mmap accesses */
996
	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)
{
1004 1005
	return (index >= ra->start &&
		index <  ra->start + ra->size);
1006 1007
}

1008 1009 1010
#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;
1020 1021 1022
	struct path		f_path;
#define f_dentry	f_path.dentry
#define f_vfsmnt	f_path.mnt
1023
	const struct file_operations	*f_op;
1024 1025 1026 1027 1028 1029

	/*
	 * Protects f_ep_links, f_flags, f_pos vs i_size in lseek SEEK_CUR.
	 * Must not be taken from IRQ context.
	 */
	spinlock_t		f_lock;
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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;
1035
	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;

1041
	u64			f_version;
1042
#ifdef CONFIG_SECURITY
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	void			*f_security;
1044
#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;
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	struct list_head	f_tfile_llink;
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#endif /* #ifdef CONFIG_EPOLL */
	struct address_space	*f_mapping;
1054 1055 1056
#ifdef CONFIG_DEBUG_WRITECOUNT
	unsigned long f_mnt_write_state;
#endif
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};

1059 1060 1061 1062 1063 1064 1065
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)
1067
#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 */
1126
#define FL_EXISTS	16	/* when unlocking, test for existence */
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#define FL_LEASE	32	/* lease held on this file */
1128
#define FL_CLOSE	64	/* unlock on close */
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#define FL_SLEEP	128	/* A blocking lock */
1130 1131
#define FL_DOWNGRADE_PENDING	256 /* Lease is being downgraded */
#define FL_UNLOCK_PENDING	512 /* Lease is being broken */
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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 {
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	int (*lm_compare_owner)(struct file_lock *, struct file_lock *);
	void (*lm_notify)(struct file_lock *);	/* unblock callback */
	int (*lm_grant)(struct file_lock *, struct file_lock *, int);
	void (*lm_release_private)(struct file_lock *);
	void (*lm_break)(struct file_lock *);
	int (*lm_change)(struct file_lock **, int);
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};

1162 1163 1164 1165 1166 1167 1168 1169
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;
1178
	unsigned int fl_flags;
1179
	unsigned char fl_type;
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	unsigned int fl_pid;
1181
	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 */
1188 1189 1190
	/* for lease breaks: */
	unsigned long fl_break_time;
	unsigned long fl_downgrade_time;
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1192
	const struct file_lock_operations *fl_ops;	/* Callbacks for filesystems */
1193
	const struct lock_manager_operations *fl_lmops;	/* Callbacks for lockmanagers */
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	union {
		struct nfs_lock_info	nfs_fl;
1196
		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>

1213 1214 1215
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 *);
1222 1223
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 */
1230
void locks_free_lock(struct file_lock *fl);
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extern void locks_init_lock(struct file_lock *);
1232
extern struct file_lock * locks_alloc_lock(void);
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extern void locks_copy_lock(struct file_lock *, struct file_lock *);
1234
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 *);
1237
extern void locks_release_private(struct file_lock *);
1238
extern void posix_test_lock(struct file *, struct file_lock *);
1239
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 *);
1242
extern int vfs_test_lock(struct file *, struct file_lock *);
1243
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);
1248
extern int generic_setlease(struct file *, long, struct file_lock **);
1249
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);
1253
extern void locks_delete_block(struct file_lock *waiter);
1254 1255
extern void lock_flocks(void);
extern void unlock_flocks(void);
1256
#else /* !CONFIG_FILE_LOCKING */
1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267
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;
}

1268
#if BITS_PER_LONG == 32
1269 1270 1271 1272 1273 1274 1275 1276 1277 1278
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;
}
1279
#endif
1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397
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;
}

1398 1399 1400 1401
static inline void locks_delete_block(struct file_lock *waiter)
{
}

1402 1403 1404 1405 1406 1407 1408 1409
static inline void lock_flocks(void)
{
}

static inline void unlock_flocks(void)
{
}

1410 1411
#endif /* !CONFIG_FILE_LOCKING */

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struct fasync_struct {
1414 1415 1416 1417 1418 1419
	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 **);
1426 1427 1428 1429 1430
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);

1434
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);
1437
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 */
1447 1448
#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;
1457 1458
	unsigned char		s_blocksize_bits;
	unsigned long		s_blocksize;
1459
	loff_t			s_maxbytes;	/* Max file size */
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	struct file_system_type	*s_type;
1461
	const struct super_operations	*s_op;
1462
	const struct dquot_operations	*dq_op;
1463
	const struct quotactl_ops	*s_qcop;
1464
	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;
1469
	struct mutex		s_lock;
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	int			s_count;
	atomic_t		s_active;
1472
#ifdef CONFIG_SECURITY
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	void                    *s_security;
1474
#endif
1475
	const struct xattr_handler **s_xattr;
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	struct list_head	s_inodes;	/* all inodes */
1478
	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
1484
	struct list_head	s_mounts;	/* list of mounts; _not_ for fs use */
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	/* s_dentry_lru, s_nr_dentry_unused protected by dcache.c lru locks */
1486 1487
	struct list_head	s_dentry_lru;	/* unused dentry lru */
	int			s_nr_dentry_unused;	/* # of dentry on lru */
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	/* s_inode_lru_lock protects s_inode_lru and s_nr_inodes_unused */
	spinlock_t		s_inode_lru_lock ____cacheline_aligned_in_smp;
1491 1492 1493
	struct list_head	s_inode_lru;		/* unused inode lru */
	int			s_nr_inodes_unused;	/* # of inodes on lru */

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	struct block_device	*s_bdev;
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	struct backing_dev_info *s_bdi;
1496
	struct mtd_info		*s_mtd;
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	struct hlist_node	s_instances;
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	struct quota_info	s_dquot;	/* Diskquota specific options */

	int			s_frozen;
	wait_queue_head_t	s_wait_unfrozen;

	char s_id[32];				/* Informational name */
1504
	u8 s_uuid[16];				/* UUID */
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	void 			*s_fs_info;	/* Filesystem private info */
1507
	unsigned int		s_max_links;
1508
	fmode_t			s_mode;
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1510 1511 1512 1513
	/* 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.
	 */
1518
	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;
1525 1526 1527 1528 1529

	/*
	 * 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 */
1532 1533 1534 1535 1536

	/*
	 * Saved pool identifier for cleancache (-1 means none)
	 */
	int cleancache_poolid;
1537 1538

	struct shrinker s_shrink;	/* per-sb shrinker handle */
1539

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	/* Number of inodes with nlink == 0 but still referenced */
	atomic_long_t s_remove_count;

1543 1544
	/* Being remounted read-only */
	int s_readonly_remount;
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};

1547 1548 1549 1550
/* superblock cache pruning functions */
extern void prune_icache_sb(struct super_block *sb, int nr_to_scan);
extern void prune_dcache_sb(struct super_block *sb, int nr_to_scan);

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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)))

1565
extern bool inode_owner_or_capable(const struct inode *inode);
1566

1567 1568 1569
/* 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..
 */
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extern int vfs_create(struct inode *, struct dentry *, umode_t, struct nameidata *);
1575
extern int vfs_mkdir(struct inode *, struct dentry *, umode_t);
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extern int vfs_mknod(struct inode *, struct dentry *, umode_t, dev_t);
1577
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);

1588 1589 1590
/*
 * VFS file helper functions.
 */
1591
extern void inode_init_owner(struct inode *inode, const struct inode *dir,
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			umode_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 */
1600 1601
	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.
 */
1629
typedef int (*filldir_t)(void *, const char *, int, loff_t, u64, unsigned);
1630
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

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 *);
1643 1644
	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);
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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 *);
1651
	int (*flush) (struct file *, fl_owner_t id);
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	int (*release) (struct inode *, struct file *);
1653
	int (*fsync) (struct file *, loff_t, loff_t, int datasync);
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	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 *);
1661 1662
	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);
1663
	int (*setlease)(struct file *, long, struct file_lock **);
1664 1665
	long (*fallocate)(struct file *file, int mode, loff_t offset,
			  loff_t len);
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};

struct inode_operations {
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	struct dentry * (*lookup) (struct inode *,struct dentry *, unsigned int);
1670
	void * (*follow_link) (struct dentry *, struct nameidata *);
1671
	int (*permission) (struct inode *, int);
1672
	struct posix_acl * (*get_acl)(struct inode *, int);
1673 1674 1675 1676

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

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	int (*create) (struct inode *,struct dentry *,umode_t,struct nameidata *);
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	int (*link) (struct dentry *,struct inode *,struct dentry *);
	int (*unlink) (struct inode *,struct dentry *);
	int (*symlink) (struct inode *,struct dentry *,const char *);
1681
	int (*mkdir) (struct inode *,struct dentry *,umode_t);
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	int (*rmdir) (struct inode *,struct dentry *);
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	int (*mknod) (struct inode *,struct dentry *,umode_t,dev_t);
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	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 *);
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	int (*fiemap)(struct inode *, struct fiemap_extent_info *, u64 start,
		      u64 len);
1695
	int (*update_time)(struct inode *, struct timespec *, int);
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	int (*atomic_open)(struct inode *, struct dentry *,
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			   struct file *, unsigned open_flag,
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			   umode_t create_mode, int *opened);
1699
} ____cacheline_aligned;
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struct seq_file;

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ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector,
C
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1704 1705
			      unsigned long nr_segs, unsigned long fast_segs,
			      struct iovec *fast_pointer,
1706
			      struct iovec **ret_pointer);
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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 *);

1719
   	void (*dirty_inode) (struct inode *, int flags);
1720
	int (*write_inode) (struct inode *, struct writeback_control *wbc);
1721
	int (*drop_inode) (struct inode *);
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	void (*evict_inode) (struct inode *);
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	void (*put_super) (struct super_block *);
	void (*write_super) (struct super_block *);
	int (*sync_fs)(struct super_block *sb, int wait);
1726 1727
	int (*freeze_fs) (struct super_block *);
	int (*unfreeze_fs) (struct super_block *);
1728
	int (*statfs) (struct dentry *, struct kstatfs *);
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	int (*remount_fs) (struct super_block *, int *, char *);
1730
	void (*umount_begin) (struct super_block *);
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1732
	int (*show_options)(struct seq_file *, struct dentry *);
1733
	int (*show_devname)(struct seq_file *, struct dentry *);
1734
	int (*show_path)(struct seq_file *, struct dentry *);
1735
	int (*show_stats)(struct seq_file *, struct dentry *);
1736
#ifdef CONFIG_QUOTA
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	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);
1739
#endif
1740
	int (*bdev_try_to_free_page)(struct super_block*, struct page*, gfp_t);
1741 1742
	int (*nr_cached_objects)(struct super_block *);
	void (*free_cached_objects)(struct super_block *, int);
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};

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/*
1746
 * Inode state bits.  Protected by inode->i_lock
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 *
 * 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.
 *
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 * Two bits are used for locking and completion notification, I_NEW and I_SYNC.
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 *
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 * I_DIRTY_SYNC		Inode is dirty, but doesn't have to be written on
 *			fdatasync().  i_atime is the usual cause.
1759 1760 1761 1762
 * 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.
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 * I_DIRTY_PAGES	Inode has dirty pages.  Inode itself may be clean.
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 * 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.
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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.
1778 1779
 * I_CLEAR		Added by clear_inode().  In this state the inode is
 *			clean and can be destroyed.  Inode keeps I_FREEING.
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 *
 *			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,
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 *			if appropriate.  I_NEW is used for waiting.
J
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 *
1787 1788 1789 1790
 * I_SYNC		Writeback of inode is running. The bit is set during
 *			data writeback, and cleared with a wakeup on the bit
 *			address once it is done. The bit is also used to pin
 *			the inode in memory for flusher thread.
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 *
C
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 * I_REFERENCED		Marks the inode as recently references on the LRU list.
 *
 * I_DIO_WAKEUP		Never set.  Only used as a key for wait_on_bit().
 *
J
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 * Q: What is the difference between I_WILL_FREE and I_FREEING?
 */
1798 1799 1800
#define I_DIRTY_SYNC		(1 << 0)
#define I_DIRTY_DATASYNC	(1 << 1)
#define I_DIRTY_PAGES		(1 << 2)
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#define __I_NEW			3
#define I_NEW			(1 << __I_NEW)
1803 1804 1805
#define I_WILL_FREE		(1 << 4)
#define I_FREEING		(1 << 5)
#define I_CLEAR			(1 << 6)
C
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1806
#define __I_SYNC		7
J
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1807
#define I_SYNC			(1 << __I_SYNC)
1808
#define I_REFERENCED		(1 << 8)
C
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1809 1810
#define __I_DIO_WAKEUP		9
#define I_DIO_WAKEUP		(1 << I_DIO_WAKEUP)
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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);
}

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extern void inc_nlink(struct inode *inode);
extern void drop_nlink(struct inode *inode);
extern void clear_nlink(struct inode *inode);
extern void set_nlink(struct inode *inode, unsigned int nlink);
1829 1830 1831 1832

static inline void inode_inc_link_count(struct inode *inode)
{
	inc_nlink(inode);
1833 1834 1835
	mark_inode_dirty(inode);
}

1836 1837 1838
static inline void inode_dec_link_count(struct inode *inode)
{
	drop_nlink(inode);
1839 1840 1841
	mark_inode_dirty(inode);
}

1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856
/**
 * 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);
}

1857 1858 1859 1860 1861 1862 1863
enum file_time_flags {
	S_ATIME = 1,
	S_MTIME = 2,
	S_CTIME = 4,
	S_VERSION = 8,
};

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extern void touch_atime(struct path *);
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static inline void file_accessed(struct file *file)
{
	if (!(file->f_flags & O_NOATIME))
A
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		touch_atime(&file->f_path);
L
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}

int sync_inode(struct inode *inode, struct writeback_control *wbc);
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int sync_inode_metadata(struct inode *inode, int wait);
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struct file_system_type {
	const char *name;
	int fs_flags;
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1877 1878
	struct dentry *(*mount) (struct file_system_type *, int,
		       const char *, void *);
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	void (*kill_sb) (struct super_block *);
	struct module *owner;
	struct file_system_type * next;
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1882
	struct hlist_head fs_supers;
1883

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	struct lock_class_key s_lock_key;
1885
	struct lock_class_key s_umount_key;
1886
	struct lock_class_key s_vfs_rename_key;
1887 1888 1889

	struct lock_class_key i_lock_key;
	struct lock_class_key i_mutex_key;
1890
	struct lock_class_key i_mutex_dir_key;
L
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};

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1893 1894
extern struct dentry *mount_ns(struct file_system_type *fs_type, int flags,
	void *data, int (*fill_super)(struct super_block *, void *, int));
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1895 1896 1897
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));
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extern struct dentry *mount_single(struct file_system_type *fs_type,
	int flags, void *data,
	int (*fill_super)(struct super_block *, void *, int));
A
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1901 1902 1903
extern struct dentry *mount_nodev(struct file_system_type *fs_type,
	int flags, void *data,
	int (*fill_super)(struct super_block *, void *, int));
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1904
extern struct dentry *mount_subtree(struct vfsmount *mnt, const char *path);
L
Linus Torvalds 已提交
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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
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1910
void deactivate_locked_super(struct super_block *sb);
L
Linus Torvalds 已提交
1911
int set_anon_super(struct super_block *s, void *data);
1912 1913
int get_anon_bdev(dev_t *);
void free_anon_bdev(dev_t);
L
Linus Torvalds 已提交
1914 1915 1916 1917
struct super_block *sget(struct file_system_type *type,
			int (*test)(struct super_block *,void *),
			int (*set)(struct super_block *,void *),
			void *data);
A
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1918
extern struct dentry *mount_pseudo(struct file_system_type *, char *,
1919 1920 1921
	const struct super_operations *ops,
	const struct dentry_operations *dops,
	unsigned long);
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1922 1923 1924 1925 1926 1927 1928 1929 1930

/* 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 *);
1931 1932
extern struct vfsmount *kern_mount_data(struct file_system_type *, void *data);
#define kern_mount(type) kern_mount_data(type, NULL)
1933
extern void kern_unmount(struct vfsmount *mnt);
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extern int may_umount_tree(struct vfsmount *);
extern int may_umount(struct vfsmount *);
extern long do_mount(char *, char *, char *, unsigned long, void *);
A
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1937
extern struct vfsmount *collect_mounts(struct path *);
1938
extern void drop_collected_mounts(struct vfsmount *);
A
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1939 1940
extern int iterate_mounts(int (*)(struct vfsmount *, void *), void *,
			  struct vfsmount *);
1941
extern int vfs_statfs(struct path *, struct kstatfs *);
A
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1942 1943
extern int user_statfs(const char __user *, struct kstatfs *);
extern int fd_statfs(int, struct kstatfs *);
A
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1944
extern int vfs_ustat(dev_t, struct kstatfs *);
1945 1946
extern int freeze_super(struct super_block *super);
extern int thaw_super(struct super_block *super);
1947
extern bool our_mnt(struct vfsmount *mnt);
L
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1948

A
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1949 1950
extern int current_umask(void);

M
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1951
/* /sys/fs */
1952
extern struct kobject *fs_kobj;
M
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1953

1954
#define MAX_RW_COUNT (INT_MAX & PAGE_CACHE_MASK)
1955 1956
extern int rw_verify_area(int, struct file *, loff_t *, size_t);

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#define FLOCK_VERIFY_READ  1
#define FLOCK_VERIFY_WRITE 2

1960
#ifdef CONFIG_FILE_LOCKING
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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.
 */
1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982

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
1983 1984 1985

static inline int locks_verify_locked(struct inode *inode)
{
1986
	if (mandatory_lock(inode))
L
Linus Torvalds 已提交
1987 1988 1989 1990 1991 1992 1993 1994
		return locks_mandatory_locked(inode);
	return 0;
}

static inline int locks_verify_truncate(struct inode *inode,
				    struct file *filp,
				    loff_t size)
{
1995
	if (inode->i_flock && mandatory_lock(inode))
L
Linus Torvalds 已提交
1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010
		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;
}
2011
#else /* !CONFIG_FILE_LOCKING */
2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049
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;
}

2050
#endif /* CONFIG_FILE_LOCKING */
L
Linus Torvalds 已提交
2051 2052 2053

/* fs/open.c */

2054 2055
extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs,
		       struct file *filp);
2056 2057
extern int do_fallocate(struct file *file, int mode, loff_t offset,
			loff_t len);
J
Jason Uhlenkott 已提交
2058
extern long do_sys_open(int dfd, const char __user *filename, int flags,
2059 2060
			umode_t mode);
extern struct file *filp_open(const char *, int, umode_t);
A
Al Viro 已提交
2061 2062
extern struct file *file_open_root(struct dentry *, struct vfsmount *,
				   const char *, int);
2063 2064
extern struct file * dentry_open(struct dentry *, struct vfsmount *, int,
				 const struct cred *);
L
Linus Torvalds 已提交
2065 2066
extern int filp_close(struct file *, fl_owner_t id);
extern char * getname(const char __user *);
2067 2068 2069 2070
enum {
	FILE_CREATED = 1,
	FILE_OPENED = 2
};
A
Al Viro 已提交
2071 2072 2073
extern int finish_open(struct file *file, struct dentry *dentry,
			int (*open)(struct inode *, struct file *),
			int *opened);
A
Al Viro 已提交
2074
extern int finish_no_open(struct file *file, struct dentry *dentry);
L
Linus Torvalds 已提交
2075

2076 2077 2078 2079
/* fs/ioctl.c */

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

L
Linus Torvalds 已提交
2080 2081 2082 2083
/* fs/dcache.c */
extern void __init vfs_caches_init_early(void);
extern void __init vfs_caches_init(unsigned long);

2084 2085
extern struct kmem_cache *names_cachep;

V
Vegard Nossum 已提交
2086 2087 2088
#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
2089 2090 2091 2092 2093 2094
#ifndef CONFIG_AUDITSYSCALL
#define putname(name)   __putname(name)
#else
extern void putname(const char *name);
#endif

2095
#ifdef CONFIG_BLOCK
L
Linus Torvalds 已提交
2096
extern int register_blkdev(unsigned int, const char *);
A
Akinobu Mita 已提交
2097
extern void unregister_blkdev(unsigned int, const char *);
L
Linus Torvalds 已提交
2098
extern struct block_device *bdget(dev_t);
2099
extern struct block_device *bdgrab(struct block_device *bdev);
L
Linus Torvalds 已提交
2100
extern void bd_set_size(struct block_device *, loff_t size);
2101
extern sector_t blkdev_max_block(struct block_device *bdev);
L
Linus Torvalds 已提交
2102 2103
extern void bd_forget(struct inode *inode);
extern void bdput(struct block_device *);
N
Nick Piggin 已提交
2104 2105
extern void invalidate_bdev(struct block_device *);
extern int sync_blockdev(struct block_device *bdev);
A
Al Viro 已提交
2106
extern void kill_bdev(struct block_device *);
N
Nick Piggin 已提交
2107
extern struct super_block *freeze_bdev(struct block_device *);
2108
extern void emergency_thaw_all(void);
N
Nick Piggin 已提交
2109 2110
extern int thaw_bdev(struct block_device *bdev, struct super_block *sb);
extern int fsync_bdev(struct block_device *);
2111 2112
#else
static inline void bd_forget(struct inode *inode) {}
2113
static inline int sync_blockdev(struct block_device *bdev) { return 0; }
A
Al Viro 已提交
2114
static inline void kill_bdev(struct block_device *bdev) {}
2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125
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;
}
2126
#endif
2127
extern int sync_filesystem(struct super_block *);
2128
extern const struct file_operations def_blk_fops;
2129 2130 2131
extern const struct file_operations def_chr_fops;
extern const struct file_operations bad_sock_fops;
extern const struct file_operations def_fifo_fops;
2132
#ifdef CONFIG_BLOCK
L
Linus Torvalds 已提交
2133
extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long);
2134
extern int blkdev_ioctl(struct block_device *, fmode_t, unsigned, unsigned long);
L
Linus Torvalds 已提交
2135
extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long);
2136
extern int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder);
2137 2138 2139 2140
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);
2141
extern int blkdev_put(struct block_device *bdev, fmode_t mode);
2142
#ifdef CONFIG_SYSFS
2143
extern int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk);
2144 2145
extern void bd_unlink_disk_holder(struct block_device *bdev,
				  struct gendisk *disk);
2146
#else
2147 2148 2149 2150 2151
static inline int bd_link_disk_holder(struct block_device *bdev,
				      struct gendisk *disk)
{
	return 0;
}
2152 2153 2154 2155
static inline void bd_unlink_disk_holder(struct block_device *bdev,
					 struct gendisk *disk)
{
}
2156
#endif
2157
#endif
L
Linus Torvalds 已提交
2158 2159

/* fs/char_dev.c */
2160
#define CHRDEV_MAJOR_HASH_SIZE	255
L
Linus Torvalds 已提交
2161 2162
extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *);
extern int register_chrdev_region(dev_t, unsigned, const char *);
2163 2164 2165 2166 2167
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
2168
extern void unregister_chrdev_region(dev_t, unsigned);
2169
extern void chrdev_show(struct seq_file *,off_t);
L
Linus Torvalds 已提交
2170

2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181
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
2182 2183
/* fs/block_dev.c */
#define BDEVNAME_SIZE	32	/* Largest string for a blockdev identifier */
2184
#define BDEVT_SIZE	10	/* Largest string for MAJ:MIN for blkdev */
2185 2186 2187

#ifdef CONFIG_BLOCK
#define BLKDEV_MAJOR_HASH_SIZE	255
L
Linus Torvalds 已提交
2188 2189 2190
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 *);
2191
extern void blkdev_show(struct seq_file *,off_t);
2192

2193 2194 2195
#else
#define BLKDEV_MAJOR_HASH_SIZE	0
#endif
L
Linus Torvalds 已提交
2196 2197 2198 2199 2200 2201 2202

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 *);

2203 2204 2205
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
2206

2207
#ifdef CONFIG_BLOCK
L
Linus Torvalds 已提交
2208 2209 2210 2211 2212 2213 2214 2215 2216 2217
/*
 * 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)

2218 2219
extern void check_disk_size_change(struct gendisk *disk,
				   struct block_device *bdev);
2220
extern int revalidate_disk(struct gendisk *);
L
Linus Torvalds 已提交
2221
extern int check_disk_change(struct block_device *);
2222
extern int __invalidate_device(struct block_device *, bool);
L
Linus Torvalds 已提交
2223
extern int invalidate_partition(struct gendisk *, int);
2224
#endif
L
Linus Torvalds 已提交
2225 2226
unsigned long invalidate_mapping_pages(struct address_space *mapping,
					pgoff_t start, pgoff_t end);
2227

L
Linus Torvalds 已提交
2228 2229 2230 2231
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))
2232
		invalidate_mapping_pages(inode->i_mapping, 0, -1);
L
Linus Torvalds 已提交
2233 2234 2235 2236 2237 2238 2239 2240
}
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 *);
2241 2242
extern int filemap_fdatawait_range(struct address_space *, loff_t lstart,
				   loff_t lend);
L
Linus Torvalds 已提交
2243 2244 2245
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);
2246 2247
extern int __filemap_fdatawrite_range(struct address_space *mapping,
				loff_t start, loff_t end, int sync_mode);
2248 2249
extern int filemap_fdatawrite_range(struct address_space *mapping,
				loff_t start, loff_t end);
2250

2251 2252 2253
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);
2254
extern int generic_write_sync(struct file *file, loff_t pos, loff_t count);
L
Linus Torvalds 已提交
2255 2256 2257
extern void sync_supers(void);
extern void emergency_sync(void);
extern void emergency_remount(void);
2258
#ifdef CONFIG_BLOCK
L
Linus Torvalds 已提交
2259
extern sector_t bmap(struct inode *, sector_t);
2260
#endif
L
Linus Torvalds 已提交
2261
extern int notify_change(struct dentry *, struct iattr *);
2262
extern int inode_permission(struct inode *, int);
2263
extern int generic_permission(struct inode *, int);
L
Linus Torvalds 已提交
2264

2265 2266 2267 2268 2269
static inline bool execute_ok(struct inode *inode)
{
	return (inode->i_mode & S_IXUGO) || S_ISDIR(inode->i_mode);
}

2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294
/*
 * get_write_access() gets write permission for a file.
 * put_write_access() releases this write permission.
 * This is used for regular files.
 * We cannot support write (and maybe mmap read-write shared) accesses and
 * MAP_DENYWRITE mmappings simultaneously. The i_writecount field of an inode
 * can have the following values:
 * 0: no writers, no VM_DENYWRITE mappings
 * < 0: (-i_writecount) vm_area_structs with VM_DENYWRITE set exist
 * > 0: (i_writecount) users are writing to the file.
 *
 * Normally we operate on that counter with atomic_{inc,dec} and it's safe
 * except for the cases where we don't hold i_writecount yet. Then we need to
 * use {get,deny}_write_access() - these functions check the sign and refuse
 * to do the change if sign is wrong.
 */
static inline int get_write_access(struct inode *inode)
{
	return atomic_inc_unless_negative(&inode->i_writecount) ? 0 : -ETXTBSY;
}
static inline int deny_write_access(struct file *file)
{
	struct inode *inode = file->f_path.dentry->d_inode;
	return atomic_dec_unless_positive(&inode->i_writecount) ? 0 : -ETXTBSY;
}
L
Linus Torvalds 已提交
2295 2296 2297 2298 2299 2300 2301
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)
2302
		atomic_inc(&file->f_path.dentry->d_inode->i_writecount);
L
Linus Torvalds 已提交
2303
}
M
Mimi Zohar 已提交
2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323
#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
2324
extern int do_pipe_flags(int *, int);
2325 2326
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
2327
extern void free_write_pipe(struct file *);
L
Linus Torvalds 已提交
2328

M
Mimi Zohar 已提交
2329
extern int kernel_read(struct file *, loff_t, char *, unsigned long);
L
Linus Torvalds 已提交
2330 2331 2332 2333
extern struct file * open_exec(const char *);
 
/* fs/dcache.c -- generic fs support functions */
extern int is_subdir(struct dentry *, struct dentry *);
2334
extern int path_is_under(struct path *, struct path *);
L
Linus Torvalds 已提交
2335 2336 2337 2338 2339 2340 2341 2342 2343
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);

2344
extern int inode_init_always(struct super_block *, struct inode *);
L
Linus Torvalds 已提交
2345
extern void inode_init_once(struct inode *);
2346
extern void address_space_init_once(struct address_space *mapping);
A
Al Viro 已提交
2347
extern void ihold(struct inode * inode);
L
Linus Torvalds 已提交
2348 2349 2350 2351
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);
2352
extern int generic_delete_inode(struct inode *inode);
2353 2354 2355 2356
static inline int generic_drop_inode(struct inode *inode)
{
	return !inode->i_nlink || inode_unhashed(inode);
}
L
Linus Torvalds 已提交
2357

2358 2359 2360
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
2361 2362 2363 2364 2365 2366
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
2367 2368
extern int insert_inode_locked4(struct inode *, unsigned long, int (*test)(struct inode *, void *), void *);
extern int insert_inode_locked(struct inode *);
2369 2370 2371 2372 2373
#ifdef CONFIG_DEBUG_LOCK_ALLOC
extern void lockdep_annotate_inode_mutex_key(struct inode *inode);
#else
static inline void lockdep_annotate_inode_mutex_key(struct inode *inode) { };
#endif
L
Linus Torvalds 已提交
2374
extern void unlock_new_inode(struct inode *);
2375
extern unsigned int get_next_ino(void);
L
Linus Torvalds 已提交
2376 2377

extern void __iget(struct inode * inode);
2378
extern void iget_failed(struct inode *);
2379
extern void clear_inode(struct inode *);
C
Christoph Hellwig 已提交
2380
extern void __destroy_inode(struct inode *);
2381 2382
extern struct inode *new_inode_pseudo(struct super_block *sb);
extern struct inode *new_inode(struct super_block *sb);
2383
extern void free_inode_nonrcu(struct inode *inode);
2384
extern int should_remove_suid(struct dentry *);
2385
extern int file_remove_suid(struct file *);
L
Linus Torvalds 已提交
2386 2387

extern void __insert_inode_hash(struct inode *, unsigned long hashval);
2388 2389
static inline void insert_inode_hash(struct inode *inode)
{
L
Linus Torvalds 已提交
2390 2391
	__insert_inode_hash(inode, inode->i_ino);
}
2392 2393 2394 2395 2396 2397 2398 2399

extern void __remove_inode_hash(struct inode *);
static inline void remove_inode_hash(struct inode *inode)
{
	if (!inode_unhashed(inode))
		__remove_inode_hash(inode);
}

2400
extern void inode_sb_list_add(struct inode *inode);
L
Linus Torvalds 已提交
2401

2402
#ifdef CONFIG_BLOCK
L
Linus Torvalds 已提交
2403 2404
extern void submit_bio(int, struct bio *);
extern int bdev_read_only(struct block_device *);
2405
#endif
L
Linus Torvalds 已提交
2406 2407 2408 2409 2410 2411 2412 2413
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);
2414
extern ssize_t generic_file_aio_read(struct kiocb *, const struct iovec *, unsigned long, loff_t);
2415 2416
extern ssize_t __generic_file_aio_write(struct kiocb *, const struct iovec *, unsigned long,
		loff_t *);
2417
extern ssize_t generic_file_aio_write(struct kiocb *, const struct iovec *, unsigned long, loff_t);
L
Linus Torvalds 已提交
2418 2419 2420 2421 2422 2423
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);
2424 2425
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
2426

2427 2428 2429
/* fs/block_dev.c */
extern ssize_t blkdev_aio_write(struct kiocb *iocb, const struct iovec *iov,
				unsigned long nr_segs, loff_t pos);
2430 2431
extern int blkdev_fsync(struct file *filp, loff_t start, loff_t end,
			int datasync);
A
Al Viro 已提交
2432
extern void block_sync_page(struct page *page);
2433

A
Andrew Morton 已提交
2434
/* fs/splice.c */
2435
extern ssize_t generic_file_splice_read(struct file *, loff_t *,
A
Andrew Morton 已提交
2436
		struct pipe_inode_info *, size_t, unsigned int);
2437 2438
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
2439
extern ssize_t generic_file_splice_write(struct pipe_inode_info *,
2440
		struct file *, loff_t *, size_t, unsigned int);
A
Andrew Morton 已提交
2441
extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe,
2442 2443
		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
2444 2445
		size_t len, unsigned int flags);

L
Linus Torvalds 已提交
2446 2447
extern void
file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping);
J
jan Blunck 已提交
2448
extern loff_t noop_llseek(struct file *file, loff_t offset, int origin);
L
Linus Torvalds 已提交
2449 2450
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
2451 2452
extern loff_t generic_file_llseek_size(struct file *file, loff_t offset,
		int origin, loff_t maxsize);
L
Linus Torvalds 已提交
2453 2454 2455
extern int generic_file_open(struct inode * inode, struct file * filp);
extern int nonseekable_open(struct inode * inode, struct file * filp);

2456
#ifdef CONFIG_FS_XIP
2457 2458
extern ssize_t xip_file_read(struct file *filp, char __user *buf, size_t len,
			     loff_t *ppos);
2459
extern int xip_file_mmap(struct file * file, struct vm_area_struct * vma);
2460 2461
extern ssize_t xip_file_write(struct file *filp, const char __user *buf,
			      size_t len, loff_t *ppos);
2462
extern int xip_truncate_page(struct address_space *mapping, loff_t from);
2463 2464 2465 2466 2467
#else
static inline int xip_truncate_page(struct address_space *mapping, loff_t from)
{
	return 0;
}
2468 2469
#endif

2470
#ifdef CONFIG_BLOCK
2471 2472
typedef void (dio_submit_t)(int rw, struct bio *bio, struct inode *inode,
			    loff_t file_offset);
L
Linus Torvalds 已提交
2473 2474

enum {
2475 2476 2477 2478 2479
	/* 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
2480 2481
};

2482 2483 2484 2485 2486 2487
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);
2488

L
Linus Torvalds 已提交
2489
static inline ssize_t blockdev_direct_IO(int rw, struct kiocb *iocb,
2490 2491
		struct inode *inode, const struct iovec *iov, loff_t offset,
		unsigned long nr_segs, get_block_t get_block)
L
Linus Torvalds 已提交
2492
{
2493 2494
	return __blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
				    offset, nr_segs, get_block, NULL, NULL,
2495
				    DIO_LOCKING | DIO_SKIP_HOLES);
L
Linus Torvalds 已提交
2496
}
2497
#endif
L
Linus Torvalds 已提交
2498

2499 2500 2501
void inode_dio_wait(struct inode *inode);
void inode_dio_done(struct inode *inode);

2502
extern const struct file_operations generic_ro_fops;
L
Linus Torvalds 已提交
2503 2504 2505 2506 2507 2508

#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);
2509 2510
extern void *page_follow_link_light(struct dentry *, struct nameidata *);
extern void page_put_link(struct dentry *, struct nameidata *, void *);
2511
extern int __page_symlink(struct inode *inode, const char *symname, int len,
2512
		int nofs);
L
Linus Torvalds 已提交
2513
extern int page_symlink(struct inode *inode, const char *symname, int len);
2514
extern const struct inode_operations page_symlink_inode_operations;
L
Linus Torvalds 已提交
2515 2516 2517
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 *);
2518
void __inode_add_bytes(struct inode *inode, loff_t bytes);
L
Linus Torvalds 已提交
2519 2520 2521 2522 2523 2524 2525
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 *);

2526 2527
extern int vfs_stat(const char __user *, struct kstat *);
extern int vfs_lstat(const char __user *, struct kstat *);
L
Linus Torvalds 已提交
2528
extern int vfs_fstat(unsigned int, struct kstat *);
2529
extern int vfs_fstatat(int , const char __user *, struct kstat *, int);
L
Linus Torvalds 已提交
2530

2531 2532
extern int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
		    unsigned long arg);
2533
extern int __generic_block_fiemap(struct inode *inode,
J
Josef Bacik 已提交
2534 2535 2536
				  struct fiemap_extent_info *fieinfo,
				  loff_t start, loff_t len,
				  get_block_t *get_block);
2537 2538 2539
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
2540

2541 2542
extern void get_filesystem(struct file_system_type *fs);
extern void put_filesystem(struct file_system_type *fs);
L
Linus Torvalds 已提交
2543 2544
extern struct file_system_type *get_fs_type(const char *name);
extern struct super_block *get_super(struct block_device *);
2545
extern struct super_block *get_super_thawed(struct block_device *);
2546
extern struct super_block *get_active_super(struct block_device *bdev);
L
Linus Torvalds 已提交
2547
extern void drop_super(struct super_block *sb);
A
Al Viro 已提交
2548
extern void iterate_supers(void (*)(struct super_block *, void *), void *);
A
Al Viro 已提交
2549 2550
extern void iterate_supers_type(struct file_system_type *,
			        void (*)(struct super_block *, void *), void *);
L
Linus Torvalds 已提交
2551 2552 2553 2554 2555

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);
2556
extern int simple_setattr(struct dentry *, struct iattr *);
L
Linus Torvalds 已提交
2557
extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *);
2558
extern int simple_statfs(struct dentry *, struct kstatfs *);
S
Stephen Boyd 已提交
2559
extern int simple_open(struct inode *inode, struct file *file);
L
Linus Torvalds 已提交
2560 2561 2562 2563
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 *);
2564
extern int noop_fsync(struct file *, loff_t, loff_t, int);
L
Linus Torvalds 已提交
2565 2566
extern int simple_empty(struct dentry *);
extern int simple_readpage(struct file *file, struct page *page);
2567 2568 2569 2570 2571 2572
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);
L
Linus Torvalds 已提交
2573

A
Al Viro 已提交
2574
extern struct dentry *simple_lookup(struct inode *, struct dentry *, unsigned int flags);
L
Linus Torvalds 已提交
2575
extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *);
2576
extern const struct file_operations simple_dir_operations;
2577
extern const struct inode_operations simple_dir_inode_operations;
2578
struct tree_descr { char *name; const struct file_operations *ops; int mode; };
L
Linus Torvalds 已提交
2579
struct dentry *d_alloc_name(struct dentry *, const char *);
2580
extern int simple_fill_super(struct super_block *, unsigned long, struct tree_descr *);
2581
extern int simple_pin_fs(struct file_system_type *, struct vfsmount **mount, int *count);
L
Linus Torvalds 已提交
2582 2583
extern void simple_release_fs(struct vfsmount **mount, int *count);

2584 2585
extern ssize_t simple_read_from_buffer(void __user *to, size_t count,
			loff_t *ppos, const void *from, size_t available);
2586 2587
extern ssize_t simple_write_to_buffer(void *to, size_t available, loff_t *ppos,
		const void __user *from, size_t count);
L
Linus Torvalds 已提交
2588

2589
extern int generic_file_fsync(struct file *, loff_t, loff_t, int);
A
Al Viro 已提交
2590

2591 2592
extern int generic_check_addressable(unsigned, u64);

2593
#ifdef CONFIG_MIGRATION
2594
extern int buffer_migrate_page(struct address_space *,
2595 2596
				struct page *, struct page *,
				enum migrate_mode);
2597 2598 2599 2600
#else
#define buffer_migrate_page NULL
#endif

N
npiggin@suse.de 已提交
2601 2602
extern int inode_change_ok(const struct inode *, struct iattr *);
extern int inode_newsize_ok(const struct inode *, loff_t offset);
C
Christoph Hellwig 已提交
2603
extern void setattr_copy(struct inode *inode, const struct iattr *attr);
L
Linus Torvalds 已提交
2604

2605
extern int file_update_time(struct file *file);
L
Linus Torvalds 已提交
2606

2607
extern int generic_show_options(struct seq_file *m, struct dentry *root);
2608
extern void save_mount_options(struct super_block *sb, char *options);
2609
extern void replace_mount_options(struct super_block *sb, char *options);
2610

L
Linus Torvalds 已提交
2611 2612 2613 2614
static inline ino_t parent_ino(struct dentry *dentry)
{
	ino_t res;

N
Nick Piggin 已提交
2615 2616 2617 2618
	/*
	 * Don't strictly need d_lock here? If the parent ino could change
	 * then surely we'd have a deeper race in the caller?
	 */
L
Linus Torvalds 已提交
2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643
	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);

2644
void simple_transaction_set(struct file *file, size_t n);
L
Linus Torvalds 已提交
2645

2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667
/*
 * 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);	\
}									\
2668
static const struct file_operations __fops = {				\
2669 2670
	.owner	 = THIS_MODULE,						\
	.open	 = __fops ## _open,					\
2671
	.release = simple_attr_release,					\
2672 2673
	.read	 = simple_attr_read,					\
	.write	 = simple_attr_write,					\
2674
	.llseek	 = generic_file_llseek,					\
2675 2676
};

2677 2678
static inline __printf(1, 2)
void __simple_attr_check_format(const char *fmt, ...)
2679 2680 2681 2682 2683
{
	/* don't do anything, just let the compiler check the arguments; */
}

int simple_attr_open(struct inode *inode, struct file *file,
2684
		     int (*get)(void *, u64 *), int (*set)(void *, u64),
2685
		     const char *fmt);
2686
int simple_attr_release(struct inode *inode, struct file *file);
2687 2688 2689 2690 2691
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
2692
struct ctl_table;
2693
int proc_nr_files(struct ctl_table *table, int write,
2694
		  void __user *buffer, size_t *lenp, loff_t *ppos);
2695 2696
int proc_nr_dentry(struct ctl_table *table, int write,
		  void __user *buffer, size_t *lenp, loff_t *ppos);
2697 2698
int proc_nr_inodes(struct ctl_table *table, int write,
		   void __user *buffer, size_t *lenp, loff_t *ppos);
2699
int __init get_filesystem_list(char *buf);
2700

N
Namhyung Kim 已提交
2701
#define __FMODE_EXEC		((__force int) FMODE_EXEC)
2702 2703
#define __FMODE_NONOTIFY	((__force int) FMODE_NONOTIFY)

A
Al Viro 已提交
2704
#define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE])
E
Eric Paris 已提交
2705
#define OPEN_FMODE(flag) ((__force fmode_t)(((flag + 1) & O_ACCMODE) | \
2706
					    (flag & __FMODE_NONOTIFY)))
A
Al Viro 已提交
2707

A
Al Viro 已提交
2708
static inline int is_sxid(umode_t mode)
2709 2710 2711 2712 2713 2714
{
	return (mode & S_ISUID) || ((mode & S_ISGID) && (mode & S_IXGRP));
}

static inline void inode_has_no_xattr(struct inode *inode)
{
A
Al Viro 已提交
2715
	if (!is_sxid(inode->i_mode) && (inode->i_sb->s_flags & MS_NOSEC))
2716 2717 2718
		inode->i_flags |= S_NOSEC;
}

L
Linus Torvalds 已提交
2719 2720
#endif /* __KERNEL__ */
#endif /* _LINUX_FS_H */