forked from mirrors/linux
0adb25d2e7
This patch fixes illegal __GFP_FS allocation inside ext3 transaction in ext3_symlink(). Such allocation may re-enter ext3 code from try_to_free_pages. But JBD/ext3 code keeps a pointer to current journal handle in task_struct and, hence, is not reentrable. This bug led to "Assertion failure in journal_dirty_metadata()" messages. http://bugzilla.openvz.org/show_bug.cgi?id=115 Signed-off-by: Andrey Savochkin <saw@saw.sw.com.sg> Signed-off-by: Kirill Korotaev <dev@openvz.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
1848 lines
66 KiB
C
1848 lines
66 KiB
C
#ifndef _LINUX_FS_H
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#define _LINUX_FS_H
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/*
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* This file has definitions for some important file table
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* structures etc.
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*/
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#include <linux/config.h>
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#include <linux/limits.h>
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#include <linux/ioctl.h>
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/*
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* It's silly to have NR_OPEN bigger than NR_FILE, but you can change
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* the file limit at runtime and only root can increase the per-process
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* nr_file rlimit, so it's safe to set up a ridiculously high absolute
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* upper limit on files-per-process.
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*
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* Some programs (notably those using select()) may have to be
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* recompiled to take full advantage of the new limits..
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*/
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/* Fixed constants first: */
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#undef NR_OPEN
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#define NR_OPEN (1024*1024) /* Absolute upper limit on fd num */
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#define INR_OPEN 1024 /* Initial setting for nfile rlimits */
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#define BLOCK_SIZE_BITS 10
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#define BLOCK_SIZE (1<<BLOCK_SIZE_BITS)
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/* And dynamically-tunable limits and defaults: */
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struct files_stat_struct {
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int nr_files; /* read only */
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int nr_free_files; /* read only */
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int max_files; /* tunable */
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};
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extern struct files_stat_struct files_stat;
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extern int get_max_files(void);
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struct inodes_stat_t {
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int nr_inodes;
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int nr_unused;
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int dummy[5];
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};
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extern struct inodes_stat_t inodes_stat;
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extern int leases_enable, lease_break_time;
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#ifdef CONFIG_DNOTIFY
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extern int dir_notify_enable;
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#endif
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#define NR_FILE 8192 /* this can well be larger on a larger system */
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#define MAY_EXEC 1
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#define MAY_WRITE 2
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#define MAY_READ 4
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#define MAY_APPEND 8
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#define FMODE_READ 1
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#define FMODE_WRITE 2
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/* Internal kernel extensions */
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#define FMODE_LSEEK 4
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#define FMODE_PREAD 8
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#define FMODE_PWRITE FMODE_PREAD /* These go hand in hand */
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#define RW_MASK 1
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#define RWA_MASK 2
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#define READ 0
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#define WRITE 1
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#define READA 2 /* read-ahead - don't block if no resources */
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#define SWRITE 3 /* for ll_rw_block() - wait for buffer lock */
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#define SPECIAL 4 /* For non-blockdevice requests in request queue */
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#define READ_SYNC (READ | (1 << BIO_RW_SYNC))
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#define WRITE_SYNC (WRITE | (1 << BIO_RW_SYNC))
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#define WRITE_BARRIER ((1 << BIO_RW) | (1 << BIO_RW_BARRIER))
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#define SEL_IN 1
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#define SEL_OUT 2
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#define SEL_EX 4
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/* public flags for file_system_type */
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#define FS_REQUIRES_DEV 1
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#define FS_BINARY_MOUNTDATA 2
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#define FS_REVAL_DOT 16384 /* Check the paths ".", ".." for staleness */
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#define FS_ODD_RENAME 32768 /* Temporary stuff; will go away as soon
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* as nfs_rename() will be cleaned up
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*/
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/*
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* These are the fs-independent mount-flags: up to 32 flags are supported
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*/
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#define MS_RDONLY 1 /* Mount read-only */
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#define MS_NOSUID 2 /* Ignore suid and sgid bits */
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#define MS_NODEV 4 /* Disallow access to device special files */
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#define MS_NOEXEC 8 /* Disallow program execution */
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#define MS_SYNCHRONOUS 16 /* Writes are synced at once */
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#define MS_REMOUNT 32 /* Alter flags of a mounted FS */
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#define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */
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#define MS_DIRSYNC 128 /* Directory modifications are synchronous */
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#define MS_NOATIME 1024 /* Do not update access times. */
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#define MS_NODIRATIME 2048 /* Do not update directory access times */
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#define MS_BIND 4096
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#define MS_MOVE 8192
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#define MS_REC 16384
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#define MS_VERBOSE 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_ACTIVE (1<<30)
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#define MS_NOUSER (1<<31)
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/*
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* Superblock flags that can be altered by MS_REMOUNT
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*/
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#define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK)
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/*
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* Old magic mount flag and mask
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*/
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#define MS_MGC_VAL 0xC0ED0000
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#define MS_MGC_MSK 0xffff0000
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/* Inode flags - they have nothing to superblock flags now */
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#define S_SYNC 1 /* Writes are synced at once */
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#define S_NOATIME 2 /* Do not update access times */
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#define S_APPEND 4 /* Append-only file */
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#define S_IMMUTABLE 8 /* Immutable file */
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#define S_DEAD 16 /* removed, but still open directory */
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#define S_NOQUOTA 32 /* Inode is not counted to quota */
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#define S_DIRSYNC 64 /* Directory modifications are synchronous */
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#define S_NOCMTIME 128 /* Do not update file c/mtime */
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#define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */
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#define S_PRIVATE 512 /* Inode is fs-internal */
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/*
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* Note that nosuid etc flags are inode-specific: setting some file-system
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* flags just means all the inodes inherit those flags by default. It might be
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* possible to override it selectively if you really wanted to with some
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* ioctl() that is not currently implemented.
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*
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* Exception: MS_RDONLY is always applied to the entire file system.
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*
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* Unfortunately, it is possible to change a filesystems flags with it mounted
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* with files in use. This means that all of the inodes will not have their
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* i_flags updated. Hence, i_flags no longer inherit the superblock mount
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* flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
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*/
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#define __IS_FLG(inode,flg) ((inode)->i_sb->s_flags & (flg))
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#define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY)
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#define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \
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((inode)->i_flags & S_SYNC))
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#define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \
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((inode)->i_flags & (S_SYNC|S_DIRSYNC)))
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#define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK)
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#define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA)
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#define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
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#define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE)
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#define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL)
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#define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD)
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#define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME)
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#define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE)
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#define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE)
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/* the read-only stuff doesn't really belong here, but any other place is
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probably as bad and I don't want to create yet another include file. */
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#define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */
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#define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */
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#define BLKRRPART _IO(0x12,95) /* re-read partition table */
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#define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */
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#define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */
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#define BLKRASET _IO(0x12,98) /* set read ahead for block device */
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#define BLKRAGET _IO(0x12,99) /* get current read ahead setting */
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#define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */
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#define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */
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#define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */
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#define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */
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#define BLKSSZGET _IO(0x12,104)/* get block device sector size */
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#if 0
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#define BLKPG _IO(0x12,105)/* See blkpg.h */
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/* Some people are morons. Do not use sizeof! */
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#define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */
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#define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */
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/* This was here just to show that the number is taken -
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probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */
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#endif
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/* A jump here: 108-111 have been used for various private purposes. */
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#define BLKBSZGET _IOR(0x12,112,size_t)
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#define BLKBSZSET _IOW(0x12,113,size_t)
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#define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
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#define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
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#define FIBMAP _IO(0x00,1) /* bmap access */
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#define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */
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#ifdef __KERNEL__
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#include <linux/linkage.h>
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#include <linux/wait.h>
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#include <linux/types.h>
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#include <linux/kdev_t.h>
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#include <linux/dcache.h>
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#include <linux/stat.h>
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#include <linux/cache.h>
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#include <linux/kobject.h>
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#include <linux/list.h>
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#include <linux/radix-tree.h>
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#include <linux/prio_tree.h>
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#include <linux/init.h>
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#include <linux/sched.h>
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#include <linux/mutex.h>
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#include <asm/atomic.h>
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#include <asm/semaphore.h>
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#include <asm/byteorder.h>
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struct hd_geometry;
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struct iovec;
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struct nameidata;
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struct kiocb;
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struct pipe_inode_info;
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struct poll_table_struct;
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struct kstatfs;
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struct vm_area_struct;
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struct vfsmount;
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extern void __init inode_init(unsigned long);
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extern void __init inode_init_early(void);
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extern void __init mnt_init(unsigned long);
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extern void __init files_init(unsigned long);
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struct buffer_head;
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typedef int (get_block_t)(struct inode *inode, sector_t iblock,
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struct buffer_head *bh_result, int create);
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typedef int (get_blocks_t)(struct inode *inode, sector_t iblock,
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unsigned long max_blocks,
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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);
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/*
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* Attribute flags. These should be or-ed together to figure out what
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* has been changed!
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*/
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#define ATTR_MODE 1
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#define ATTR_UID 2
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#define ATTR_GID 4
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#define ATTR_SIZE 8
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#define ATTR_ATIME 16
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#define ATTR_MTIME 32
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#define ATTR_CTIME 64
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#define ATTR_ATIME_SET 128
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#define ATTR_MTIME_SET 256
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#define ATTR_FORCE 512 /* Not a change, but a change it */
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#define ATTR_ATTR_FLAG 1024
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#define ATTR_KILL_SUID 2048
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#define ATTR_KILL_SGID 4096
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#define ATTR_FILE 8192
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/*
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* This is the Inode Attributes structure, used for notify_change(). It
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* uses the above definitions as flags, to know which values have changed.
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* Also, in this manner, a Filesystem can look at only the values it cares
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* about. Basically, these are the attributes that the VFS layer can
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* request to change from the FS layer.
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*
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* Derek Atkins <warlord@MIT.EDU> 94-10-20
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*/
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struct iattr {
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unsigned int ia_valid;
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umode_t ia_mode;
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uid_t ia_uid;
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gid_t ia_gid;
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loff_t ia_size;
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struct timespec ia_atime;
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struct timespec ia_mtime;
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struct timespec ia_ctime;
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/*
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* Not an attribute, but an auxilary info for filesystems wanting to
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* implement an ftruncate() like method. NOTE: filesystem should
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* check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL).
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*/
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struct file *ia_file;
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};
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/*
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* Includes for diskquotas.
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*/
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#include <linux/quota.h>
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/**
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* enum positive_aop_returns - aop return codes with specific semantics
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*
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* @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has
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* completed, that the page is still locked, and
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* should be considered active. The VM uses this hint
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* to return the page to the active list -- it won't
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* be a candidate for writeback again in the near
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* future. Other callers must be careful to unlock
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* the page if they get this return. Returned by
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* writepage();
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*
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* @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has
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* unlocked it and the page might have been truncated.
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* The caller should back up to acquiring a new page and
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* trying again. The aop will be taking reasonable
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* precautions not to livelock. If the caller held a page
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* reference, it should drop it before retrying. Returned
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* by readpage(), prepare_write(), and commit_write().
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*
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* address_space_operation functions return these large constants to indicate
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* special semantics to the caller. These are much larger than the bytes in a
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* page to allow for functions that return the number of bytes operated on in a
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* given page.
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*/
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enum positive_aop_returns {
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AOP_WRITEPAGE_ACTIVATE = 0x80000,
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AOP_TRUNCATED_PAGE = 0x80001,
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};
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/*
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* oh the beauties of C type declarations.
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*/
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struct page;
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struct address_space;
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struct writeback_control;
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struct address_space_operations {
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int (*writepage)(struct page *page, struct writeback_control *wbc);
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int (*readpage)(struct file *, struct page *);
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int (*sync_page)(struct page *);
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/* Write back some dirty pages from this mapping. */
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int (*writepages)(struct address_space *, struct writeback_control *);
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/* Set a page dirty */
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int (*set_page_dirty)(struct page *page);
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int (*readpages)(struct file *filp, struct address_space *mapping,
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struct list_head *pages, unsigned nr_pages);
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/*
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* ext3 requires that a successful prepare_write() call be followed
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* by a commit_write() call - they must be balanced
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*/
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int (*prepare_write)(struct file *, struct page *, unsigned, unsigned);
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int (*commit_write)(struct file *, struct page *, unsigned, unsigned);
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/* Unfortunately this kludge is needed for FIBMAP. Don't use it */
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sector_t (*bmap)(struct address_space *, sector_t);
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int (*invalidatepage) (struct page *, unsigned long);
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int (*releasepage) (struct page *, gfp_t);
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ssize_t (*direct_IO)(int, struct kiocb *, const struct iovec *iov,
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loff_t offset, unsigned long nr_segs);
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struct page* (*get_xip_page)(struct address_space *, sector_t,
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int);
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/* migrate the contents of a page to the specified target */
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int (*migratepage) (struct page *, struct page *);
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};
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struct backing_dev_info;
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struct address_space {
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struct inode *host; /* owner: inode, block_device */
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struct radix_tree_root page_tree; /* radix tree of all pages */
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rwlock_t tree_lock; /* and rwlock protecting it */
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unsigned int i_mmap_writable;/* count VM_SHARED mappings */
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struct prio_tree_root i_mmap; /* tree of private and shared mappings */
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struct list_head i_mmap_nonlinear;/*list VM_NONLINEAR mappings */
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spinlock_t i_mmap_lock; /* protect tree, count, list */
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unsigned int truncate_count; /* Cover race condition with truncate */
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unsigned long nrpages; /* number of total pages */
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pgoff_t writeback_index;/* writeback starts here */
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struct address_space_operations *a_ops; /* methods */
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unsigned long flags; /* error bits/gfp mask */
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struct backing_dev_info *backing_dev_info; /* device readahead, etc */
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spinlock_t private_lock; /* for use by the address_space */
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struct list_head private_list; /* ditto */
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struct address_space *assoc_mapping; /* ditto */
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} __attribute__((aligned(sizeof(long))));
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/*
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* On most architectures that alignment is already the case; but
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* must be enforced here for CRIS, to let the least signficant bit
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* of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON.
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*/
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struct block_device {
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dev_t bd_dev; /* not a kdev_t - it's a search key */
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struct inode * bd_inode; /* will die */
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int bd_openers;
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struct semaphore bd_sem; /* open/close mutex */
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struct semaphore bd_mount_sem; /* mount mutex */
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struct list_head bd_inodes;
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void * bd_holder;
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int bd_holders;
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struct block_device * bd_contains;
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unsigned bd_block_size;
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struct hd_struct * bd_part;
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/* number of times partitions within this device have been opened. */
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unsigned bd_part_count;
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int bd_invalidated;
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struct gendisk * bd_disk;
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struct list_head bd_list;
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struct backing_dev_info *bd_inode_backing_dev_info;
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/*
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* Private data. You must have bd_claim'ed the block_device
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* to use this. NOTE: bd_claim allows an owner to claim
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* the same device multiple times, the owner must take special
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* care to not mess up bd_private for that case.
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*/
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unsigned long bd_private;
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};
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/*
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* Radix-tree tags, for tagging dirty and writeback pages within the pagecache
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* radix trees
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*/
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#define PAGECACHE_TAG_DIRTY 0
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#define PAGECACHE_TAG_WRITEBACK 1
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int mapping_tagged(struct address_space *mapping, int tag);
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/*
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* Might pages of this file be mapped into userspace?
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*/
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static inline int mapping_mapped(struct address_space *mapping)
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{
|
|
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
|
|
|
|
struct inode {
|
|
struct hlist_node i_hash;
|
|
struct list_head i_list;
|
|
struct list_head i_sb_list;
|
|
struct list_head i_dentry;
|
|
unsigned long i_ino;
|
|
atomic_t i_count;
|
|
umode_t i_mode;
|
|
unsigned int i_nlink;
|
|
uid_t i_uid;
|
|
gid_t i_gid;
|
|
dev_t i_rdev;
|
|
loff_t i_size;
|
|
struct timespec i_atime;
|
|
struct timespec i_mtime;
|
|
struct timespec i_ctime;
|
|
unsigned int i_blkbits;
|
|
unsigned long i_blksize;
|
|
unsigned long i_version;
|
|
unsigned long i_blocks;
|
|
unsigned short i_bytes;
|
|
spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */
|
|
struct mutex i_mutex;
|
|
struct rw_semaphore i_alloc_sem;
|
|
struct inode_operations *i_op;
|
|
struct file_operations *i_fop; /* former ->i_op->default_file_ops */
|
|
struct super_block *i_sb;
|
|
struct file_lock *i_flock;
|
|
struct address_space *i_mapping;
|
|
struct address_space i_data;
|
|
#ifdef CONFIG_QUOTA
|
|
struct dquot *i_dquot[MAXQUOTAS];
|
|
#endif
|
|
/* These three should probably be a union */
|
|
struct list_head i_devices;
|
|
struct pipe_inode_info *i_pipe;
|
|
struct block_device *i_bdev;
|
|
struct cdev *i_cdev;
|
|
int i_cindex;
|
|
|
|
__u32 i_generation;
|
|
|
|
#ifdef CONFIG_DNOTIFY
|
|
unsigned long i_dnotify_mask; /* Directory notify events */
|
|
struct dnotify_struct *i_dnotify; /* for directory notifications */
|
|
#endif
|
|
|
|
#ifdef CONFIG_INOTIFY
|
|
struct list_head inotify_watches; /* watches on this inode */
|
|
struct semaphore inotify_sem; /* protects the watches list */
|
|
#endif
|
|
|
|
unsigned long i_state;
|
|
unsigned long dirtied_when; /* jiffies of first dirtying */
|
|
|
|
unsigned int i_flags;
|
|
|
|
atomic_t i_writecount;
|
|
void *i_security;
|
|
union {
|
|
void *generic_ip;
|
|
} u;
|
|
#ifdef __NEED_I_SIZE_ORDERED
|
|
seqcount_t i_size_seqcount;
|
|
#endif
|
|
};
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
static inline loff_t i_size_read(struct inode *inode)
|
|
{
|
|
#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
|
|
}
|
|
|
|
|
|
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
|
|
}
|
|
|
|
static inline unsigned iminor(struct inode *inode)
|
|
{
|
|
return MINOR(inode->i_rdev);
|
|
}
|
|
|
|
static inline unsigned imajor(struct inode *inode)
|
|
{
|
|
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 */
|
|
int pid; /* pid or -pgrp where SIGIO should be sent */
|
|
uid_t uid, euid; /* uid/euid of process setting the owner */
|
|
void *security;
|
|
int signum; /* posix.1b rt signal to be delivered on IO */
|
|
};
|
|
|
|
/*
|
|
* Track a single file's readahead state
|
|
*/
|
|
struct file_ra_state {
|
|
unsigned long start; /* Current window */
|
|
unsigned long size;
|
|
unsigned long flags; /* ra flags RA_FLAG_xxx*/
|
|
unsigned long cache_hit; /* cache hit count*/
|
|
unsigned long prev_page; /* Cache last read() position */
|
|
unsigned long ahead_start; /* Ahead window */
|
|
unsigned long ahead_size;
|
|
unsigned long ra_pages; /* Maximum readahead window */
|
|
unsigned long mmap_hit; /* Cache hit stat for mmap accesses */
|
|
unsigned long mmap_miss; /* Cache miss stat for mmap accesses */
|
|
};
|
|
#define RA_FLAG_MISS 0x01 /* a cache miss occured against this file */
|
|
#define RA_FLAG_INCACHE 0x02 /* file is already in cache */
|
|
|
|
struct file {
|
|
/*
|
|
* 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;
|
|
struct dentry *f_dentry;
|
|
struct vfsmount *f_vfsmnt;
|
|
struct file_operations *f_op;
|
|
atomic_t f_count;
|
|
unsigned int f_flags;
|
|
mode_t f_mode;
|
|
loff_t f_pos;
|
|
struct fown_struct f_owner;
|
|
unsigned int f_uid, f_gid;
|
|
struct file_ra_state f_ra;
|
|
|
|
unsigned long f_version;
|
|
void *f_security;
|
|
|
|
/* 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;
|
|
spinlock_t f_ep_lock;
|
|
#endif /* #ifdef CONFIG_EPOLL */
|
|
struct address_space *f_mapping;
|
|
};
|
|
extern spinlock_t files_lock;
|
|
#define file_list_lock() spin_lock(&files_lock);
|
|
#define file_list_unlock() spin_unlock(&files_lock);
|
|
|
|
#define get_file(x) atomic_inc(&(x)->f_count)
|
|
#define file_count(x) atomic_read(&(x)->f_count)
|
|
|
|
#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 */
|
|
#define FL_LOCKD 16 /* lock held by rpc.lockd */
|
|
#define FL_LEASE 32 /* lease held on this file */
|
|
#define FL_SLEEP 128 /* A blocking lock */
|
|
|
|
/*
|
|
* 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_insert)(struct file_lock *); /* lock insertion callback */
|
|
void (*fl_remove)(struct file_lock *); /* lock removal callback */
|
|
void (*fl_copy_lock)(struct file_lock *, struct file_lock *);
|
|
void (*fl_release_private)(struct file_lock *);
|
|
};
|
|
|
|
struct lock_manager_operations {
|
|
int (*fl_compare_owner)(struct file_lock *, struct file_lock *);
|
|
void (*fl_notify)(struct file_lock *); /* unblock callback */
|
|
void (*fl_copy_lock)(struct file_lock *, struct file_lock *);
|
|
void (*fl_release_private)(struct file_lock *);
|
|
void (*fl_break)(struct file_lock *);
|
|
int (*fl_mylease)(struct file_lock *, struct file_lock *);
|
|
int (*fl_change)(struct file_lock **, int);
|
|
};
|
|
|
|
/* 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;
|
|
unsigned int fl_pid;
|
|
wait_queue_head_t fl_wait;
|
|
struct file *fl_file;
|
|
unsigned char fl_flags;
|
|
unsigned char fl_type;
|
|
loff_t fl_start;
|
|
loff_t fl_end;
|
|
|
|
struct fasync_struct * fl_fasync; /* for lease break notifications */
|
|
unsigned long fl_break_time; /* for nonblocking lease breaks */
|
|
|
|
struct file_lock_operations *fl_ops; /* Callbacks for filesystems */
|
|
struct lock_manager_operations *fl_lmops; /* Callbacks for lockmanagers */
|
|
union {
|
|
struct nfs_lock_info nfs_fl;
|
|
struct nfs4_lock_info nfs4_fl;
|
|
} 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
|
|
|
|
extern struct list_head file_lock_list;
|
|
|
|
#include <linux/fcntl.h>
|
|
|
|
extern int fcntl_getlk(struct file *, struct flock __user *);
|
|
extern int fcntl_setlk(unsigned int, struct file *, unsigned int,
|
|
struct flock __user *);
|
|
|
|
#if BITS_PER_LONG == 32
|
|
extern int fcntl_getlk64(struct file *, struct flock64 __user *);
|
|
extern int fcntl_setlk64(unsigned int, struct file *, unsigned int,
|
|
struct flock64 __user *);
|
|
#endif
|
|
|
|
extern void send_sigio(struct fown_struct *fown, int fd, int band);
|
|
extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg);
|
|
extern int fcntl_getlease(struct file *filp);
|
|
|
|
/* fs/locks.c */
|
|
extern void locks_init_lock(struct file_lock *);
|
|
extern void locks_copy_lock(struct file_lock *, struct file_lock *);
|
|
extern void locks_remove_posix(struct file *, fl_owner_t);
|
|
extern void locks_remove_flock(struct file *);
|
|
extern struct file_lock *posix_test_lock(struct file *, struct file_lock *);
|
|
extern int posix_lock_file(struct file *, struct file_lock *);
|
|
extern int posix_lock_file_wait(struct file *, struct file_lock *);
|
|
extern void posix_block_lock(struct file_lock *, struct file_lock *);
|
|
extern int posix_unblock_lock(struct file *, struct file_lock *);
|
|
extern int posix_locks_deadlock(struct file_lock *, struct file_lock *);
|
|
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);
|
|
extern int setlease(struct file *, long, struct file_lock **);
|
|
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);
|
|
extern void steal_locks(fl_owner_t from);
|
|
|
|
struct fasync_struct {
|
|
int magic;
|
|
int fa_fd;
|
|
struct fasync_struct *fa_next; /* singly linked list */
|
|
struct file *fa_file;
|
|
};
|
|
|
|
#define FASYNC_MAGIC 0x4601
|
|
|
|
/* SMP safe fasync helpers: */
|
|
extern int fasync_helper(int, struct file *, int, struct fasync_struct **);
|
|
/* can be called from interrupts */
|
|
extern void kill_fasync(struct fasync_struct **, int, int);
|
|
/* only for net: no internal synchronization */
|
|
extern void __kill_fasync(struct fasync_struct *, int, int);
|
|
|
|
extern int f_setown(struct file *filp, unsigned long arg, int force);
|
|
extern void f_delown(struct file *filp);
|
|
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 */
|
|
|
|
extern struct list_head super_blocks;
|
|
extern spinlock_t sb_lock;
|
|
|
|
#define sb_entry(list) list_entry((list), struct super_block, s_list)
|
|
#define S_BIAS (1<<30)
|
|
struct super_block {
|
|
struct list_head s_list; /* Keep this first */
|
|
dev_t s_dev; /* search index; _not_ kdev_t */
|
|
unsigned long s_blocksize;
|
|
unsigned char s_blocksize_bits;
|
|
unsigned char s_dirt;
|
|
unsigned long long s_maxbytes; /* Max file size */
|
|
struct file_system_type *s_type;
|
|
struct super_operations *s_op;
|
|
struct dquot_operations *dq_op;
|
|
struct quotactl_ops *s_qcop;
|
|
struct export_operations *s_export_op;
|
|
unsigned long s_flags;
|
|
unsigned long s_magic;
|
|
struct dentry *s_root;
|
|
struct rw_semaphore s_umount;
|
|
struct mutex s_lock;
|
|
int s_count;
|
|
int s_syncing;
|
|
int s_need_sync_fs;
|
|
atomic_t s_active;
|
|
void *s_security;
|
|
struct xattr_handler **s_xattr;
|
|
|
|
struct list_head s_inodes; /* all inodes */
|
|
struct list_head s_dirty; /* dirty inodes */
|
|
struct list_head s_io; /* parked for writeback */
|
|
struct hlist_head s_anon; /* anonymous dentries for (nfs) exporting */
|
|
struct list_head s_files;
|
|
|
|
struct block_device *s_bdev;
|
|
struct list_head s_instances;
|
|
struct quota_info s_dquot; /* Diskquota specific options */
|
|
|
|
int s_frozen;
|
|
wait_queue_head_t s_wait_unfrozen;
|
|
|
|
char s_id[32]; /* Informational name */
|
|
|
|
void *s_fs_info; /* Filesystem private info */
|
|
|
|
/*
|
|
* The next field is for VFS *only*. No filesystems have any business
|
|
* even looking at it. You had been warned.
|
|
*/
|
|
struct semaphore s_vfs_rename_sem; /* Kludge */
|
|
|
|
/* Granuality of c/m/atime in ns.
|
|
Cannot be worse than a second */
|
|
u32 s_time_gran;
|
|
};
|
|
|
|
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)))
|
|
|
|
static inline void get_fs_excl(void)
|
|
{
|
|
atomic_inc(¤t->fs_excl);
|
|
}
|
|
|
|
static inline void put_fs_excl(void)
|
|
{
|
|
atomic_dec(¤t->fs_excl);
|
|
}
|
|
|
|
static inline int has_fs_excl(void)
|
|
{
|
|
return atomic_read(¤t->fs_excl);
|
|
}
|
|
|
|
|
|
/*
|
|
* Superblock locking.
|
|
*/
|
|
static inline void lock_super(struct super_block * sb)
|
|
{
|
|
get_fs_excl();
|
|
mutex_lock(&sb->s_lock);
|
|
}
|
|
|
|
static inline void unlock_super(struct super_block * sb)
|
|
{
|
|
put_fs_excl();
|
|
mutex_unlock(&sb->s_lock);
|
|
}
|
|
|
|
/*
|
|
* VFS helper functions..
|
|
*/
|
|
extern int vfs_permission(struct nameidata *, int);
|
|
extern int vfs_create(struct inode *, struct dentry *, int, struct nameidata *);
|
|
extern int vfs_mkdir(struct inode *, struct dentry *, int);
|
|
extern int vfs_mknod(struct inode *, struct dentry *, int, dev_t);
|
|
extern int vfs_symlink(struct inode *, struct dentry *, const char *, int);
|
|
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);
|
|
|
|
/*
|
|
* VFS file helper functions.
|
|
*/
|
|
extern int file_permission(struct file *, int);
|
|
|
|
/*
|
|
* 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
|
|
|
|
#define OSYNC_METADATA (1<<0)
|
|
#define OSYNC_DATA (1<<1)
|
|
#define OSYNC_INODE (1<<2)
|
|
int generic_osync_inode(struct inode *, struct address_space *, int);
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
typedef int (*filldir_t)(void *, const char *, int, loff_t, ino_t, unsigned);
|
|
|
|
struct block_device_operations {
|
|
int (*open) (struct inode *, struct file *);
|
|
int (*release) (struct inode *, struct file *);
|
|
int (*ioctl) (struct inode *, struct file *, unsigned, unsigned long);
|
|
long (*unlocked_ioctl) (struct file *, unsigned, unsigned long);
|
|
long (*compat_ioctl) (struct file *, unsigned, unsigned long);
|
|
int (*direct_access) (struct block_device *, sector_t, unsigned long *);
|
|
int (*media_changed) (struct gendisk *);
|
|
int (*revalidate_disk) (struct gendisk *);
|
|
int (*getgeo)(struct block_device *, struct hd_geometry *);
|
|
struct module *owner;
|
|
};
|
|
|
|
/*
|
|
* "descriptor" for what we're up to with a read for sendfile().
|
|
* 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);
|
|
|
|
/* These macros are for out of kernel modules to test that
|
|
* the kernel supports the unlocked_ioctl and compat_ioctl
|
|
* fields in struct file_operations. */
|
|
#define HAVE_COMPAT_IOCTL 1
|
|
#define HAVE_UNLOCKED_IOCTL 1
|
|
|
|
/*
|
|
* NOTE:
|
|
* read, write, poll, fsync, readv, writev, unlocked_ioctl and compat_ioctl
|
|
* can be called without the big kernel lock held in all filesystems.
|
|
*/
|
|
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 (*aio_read) (struct kiocb *, char __user *, size_t, loff_t);
|
|
ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *);
|
|
ssize_t (*aio_write) (struct kiocb *, const char __user *, size_t, loff_t);
|
|
int (*readdir) (struct file *, void *, filldir_t);
|
|
unsigned int (*poll) (struct file *, struct poll_table_struct *);
|
|
int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long);
|
|
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 *);
|
|
int (*flush) (struct file *);
|
|
int (*release) (struct inode *, struct file *);
|
|
int (*fsync) (struct file *, struct dentry *, int datasync);
|
|
int (*aio_fsync) (struct kiocb *, int datasync);
|
|
int (*fasync) (int, struct file *, int);
|
|
int (*lock) (struct file *, int, struct file_lock *);
|
|
ssize_t (*readv) (struct file *, const struct iovec *, unsigned long, loff_t *);
|
|
ssize_t (*writev) (struct file *, const struct iovec *, unsigned long, loff_t *);
|
|
ssize_t (*sendfile) (struct file *, loff_t *, size_t, read_actor_t, void *);
|
|
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 (*dir_notify)(struct file *filp, unsigned long arg);
|
|
int (*flock) (struct file *, int, struct file_lock *);
|
|
};
|
|
|
|
struct inode_operations {
|
|
int (*create) (struct inode *,struct dentry *,int, struct nameidata *);
|
|
struct dentry * (*lookup) (struct inode *,struct dentry *, struct nameidata *);
|
|
int (*link) (struct dentry *,struct inode *,struct dentry *);
|
|
int (*unlink) (struct inode *,struct dentry *);
|
|
int (*symlink) (struct inode *,struct dentry *,const char *);
|
|
int (*mkdir) (struct inode *,struct dentry *,int);
|
|
int (*rmdir) (struct inode *,struct dentry *);
|
|
int (*mknod) (struct inode *,struct dentry *,int,dev_t);
|
|
int (*rename) (struct inode *, struct dentry *,
|
|
struct inode *, struct dentry *);
|
|
int (*readlink) (struct dentry *, char __user *,int);
|
|
void * (*follow_link) (struct dentry *, struct nameidata *);
|
|
void (*put_link) (struct dentry *, struct nameidata *, void *);
|
|
void (*truncate) (struct inode *);
|
|
int (*permission) (struct inode *, int, struct nameidata *);
|
|
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 *);
|
|
void (*truncate_range)(struct inode *, loff_t, loff_t);
|
|
};
|
|
|
|
struct seq_file;
|
|
|
|
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 *);
|
|
|
|
/*
|
|
* NOTE: write_inode, delete_inode, clear_inode, put_inode can be called
|
|
* without the big kernel lock held in all filesystems.
|
|
*/
|
|
struct super_operations {
|
|
struct inode *(*alloc_inode)(struct super_block *sb);
|
|
void (*destroy_inode)(struct inode *);
|
|
|
|
void (*read_inode) (struct inode *);
|
|
|
|
void (*dirty_inode) (struct inode *);
|
|
int (*write_inode) (struct inode *, int);
|
|
void (*put_inode) (struct inode *);
|
|
void (*drop_inode) (struct inode *);
|
|
void (*delete_inode) (struct inode *);
|
|
void (*put_super) (struct super_block *);
|
|
void (*write_super) (struct super_block *);
|
|
int (*sync_fs)(struct super_block *sb, int wait);
|
|
void (*write_super_lockfs) (struct super_block *);
|
|
void (*unlockfs) (struct super_block *);
|
|
int (*statfs) (struct super_block *, struct kstatfs *);
|
|
int (*remount_fs) (struct super_block *, int *, char *);
|
|
void (*clear_inode) (struct inode *);
|
|
void (*umount_begin) (struct super_block *);
|
|
|
|
int (*show_options)(struct seq_file *, struct vfsmount *);
|
|
|
|
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);
|
|
};
|
|
|
|
/* Inode state bits. Protected by inode_lock. */
|
|
#define I_DIRTY_SYNC 1 /* Not dirty enough for O_DATASYNC */
|
|
#define I_DIRTY_DATASYNC 2 /* Data-related inode changes pending */
|
|
#define I_DIRTY_PAGES 4 /* Data-related inode changes pending */
|
|
#define __I_LOCK 3
|
|
#define I_LOCK (1 << __I_LOCK)
|
|
#define I_FREEING 16
|
|
#define I_CLEAR 32
|
|
#define I_NEW 64
|
|
#define I_WILL_FREE 128
|
|
|
|
#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);
|
|
}
|
|
|
|
extern void touch_atime(struct vfsmount *mnt, struct dentry *dentry);
|
|
static inline void file_accessed(struct file *file)
|
|
{
|
|
if (!(file->f_flags & O_NOATIME))
|
|
touch_atime(file->f_vfsmnt, file->f_dentry);
|
|
}
|
|
|
|
int sync_inode(struct inode *inode, struct writeback_control *wbc);
|
|
|
|
/**
|
|
* struct export_operations - for nfsd to communicate with file systems
|
|
* @decode_fh: decode a file handle fragment and return a &struct dentry
|
|
* @encode_fh: encode a file handle fragment from a dentry
|
|
* @get_name: find the name for a given inode in a given directory
|
|
* @get_parent: find the parent of a given directory
|
|
* @get_dentry: find a dentry for the inode given a file handle sub-fragment
|
|
* @find_exported_dentry:
|
|
* set by the exporting module to a standard helper function.
|
|
*
|
|
* Description:
|
|
* The export_operations structure provides a means for nfsd to communicate
|
|
* with a particular exported file system - particularly enabling nfsd and
|
|
* the filesystem to co-operate when dealing with file handles.
|
|
*
|
|
* export_operations contains two basic operation for dealing with file
|
|
* handles, decode_fh() and encode_fh(), and allows for some other
|
|
* operations to be defined which standard helper routines use to get
|
|
* specific information from the filesystem.
|
|
*
|
|
* nfsd encodes information use to determine which filesystem a filehandle
|
|
* applies to in the initial part of the file handle. The remainder, termed
|
|
* a file handle fragment, is controlled completely by the filesystem. The
|
|
* standard helper routines assume that this fragment will contain one or
|
|
* two sub-fragments, one which identifies the file, and one which may be
|
|
* used to identify the (a) directory containing the file.
|
|
*
|
|
* In some situations, nfsd needs to get a dentry which is connected into a
|
|
* specific part of the file tree. To allow for this, it passes the
|
|
* function acceptable() together with a @context which can be used to see
|
|
* if the dentry is acceptable. As there can be multiple dentrys for a
|
|
* given file, the filesystem should check each one for acceptability before
|
|
* looking for the next. As soon as an acceptable one is found, it should
|
|
* be returned.
|
|
*
|
|
* decode_fh:
|
|
* @decode_fh is given a &struct super_block (@sb), a file handle fragment
|
|
* (@fh, @fh_len) and an acceptability testing function (@acceptable,
|
|
* @context). It should return a &struct dentry which refers to the same
|
|
* file that the file handle fragment refers to, and which passes the
|
|
* acceptability test. If it cannot, it should return a %NULL pointer if
|
|
* the file was found but no acceptable &dentries were available, or a
|
|
* %ERR_PTR error code indicating why it couldn't be found (e.g. %ENOENT or
|
|
* %ENOMEM).
|
|
*
|
|
* encode_fh:
|
|
* @encode_fh should store in the file handle fragment @fh (using at most
|
|
* @max_len bytes) information that can be used by @decode_fh to recover the
|
|
* file refered to by the &struct dentry @de. If the @connectable flag is
|
|
* set, the encode_fh() should store sufficient information so that a good
|
|
* attempt can be made to find not only the file but also it's place in the
|
|
* filesystem. This typically means storing a reference to de->d_parent in
|
|
* the filehandle fragment. encode_fh() should return the number of bytes
|
|
* stored or a negative error code such as %-ENOSPC
|
|
*
|
|
* get_name:
|
|
* @get_name should find a name for the given @child in the given @parent
|
|
* directory. The name should be stored in the @name (with the
|
|
* understanding that it is already pointing to a a %NAME_MAX+1 sized
|
|
* buffer. get_name() should return %0 on success, a negative error code
|
|
* or error. @get_name will be called without @parent->i_mutex held.
|
|
*
|
|
* get_parent:
|
|
* @get_parent should find the parent directory for the given @child which
|
|
* is also a directory. In the event that it cannot be found, or storage
|
|
* space cannot be allocated, a %ERR_PTR should be returned.
|
|
*
|
|
* get_dentry:
|
|
* Given a &super_block (@sb) and a pointer to a file-system specific inode
|
|
* identifier, possibly an inode number, (@inump) get_dentry() should find
|
|
* the identified inode and return a dentry for that inode. Any suitable
|
|
* dentry can be returned including, if necessary, a new dentry created with
|
|
* d_alloc_root. The caller can then find any other extant dentrys by
|
|
* following the d_alias links. If a new dentry was created using
|
|
* d_alloc_root, DCACHE_NFSD_DISCONNECTED should be set, and the dentry
|
|
* should be d_rehash()ed.
|
|
*
|
|
* If the inode cannot be found, either a %NULL pointer or an %ERR_PTR code
|
|
* can be returned. The @inump will be whatever was passed to
|
|
* nfsd_find_fh_dentry() in either the @obj or @parent parameters.
|
|
*
|
|
* Locking rules:
|
|
* get_parent is called with child->d_inode->i_mutex down
|
|
* get_name is not (which is possibly inconsistent)
|
|
*/
|
|
|
|
struct export_operations {
|
|
struct dentry *(*decode_fh)(struct super_block *sb, __u32 *fh, int fh_len, int fh_type,
|
|
int (*acceptable)(void *context, struct dentry *de),
|
|
void *context);
|
|
int (*encode_fh)(struct dentry *de, __u32 *fh, int *max_len,
|
|
int connectable);
|
|
|
|
/* the following are only called from the filesystem itself */
|
|
int (*get_name)(struct dentry *parent, char *name,
|
|
struct dentry *child);
|
|
struct dentry * (*get_parent)(struct dentry *child);
|
|
struct dentry * (*get_dentry)(struct super_block *sb, void *inump);
|
|
|
|
/* This is set by the exporting module to a standard helper */
|
|
struct dentry * (*find_exported_dentry)(
|
|
struct super_block *sb, void *obj, void *parent,
|
|
int (*acceptable)(void *context, struct dentry *de),
|
|
void *context);
|
|
|
|
|
|
};
|
|
|
|
extern struct dentry *
|
|
find_exported_dentry(struct super_block *sb, void *obj, void *parent,
|
|
int (*acceptable)(void *context, struct dentry *de),
|
|
void *context);
|
|
|
|
struct file_system_type {
|
|
const char *name;
|
|
int fs_flags;
|
|
struct super_block *(*get_sb) (struct file_system_type *, int,
|
|
const char *, void *);
|
|
void (*kill_sb) (struct super_block *);
|
|
struct module *owner;
|
|
struct file_system_type * next;
|
|
struct list_head fs_supers;
|
|
};
|
|
|
|
struct super_block *get_sb_bdev(struct file_system_type *fs_type,
|
|
int flags, const char *dev_name, void *data,
|
|
int (*fill_super)(struct super_block *, void *, int));
|
|
struct super_block *get_sb_single(struct file_system_type *fs_type,
|
|
int flags, void *data,
|
|
int (*fill_super)(struct super_block *, void *, int));
|
|
struct super_block *get_sb_nodev(struct file_system_type *fs_type,
|
|
int flags, void *data,
|
|
int (*fill_super)(struct super_block *, void *, int));
|
|
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);
|
|
int set_anon_super(struct super_block *s, void *data);
|
|
struct super_block *sget(struct file_system_type *type,
|
|
int (*test)(struct super_block *,void *),
|
|
int (*set)(struct super_block *,void *),
|
|
void *data);
|
|
struct super_block *get_sb_pseudo(struct file_system_type *, char *,
|
|
struct super_operations *ops, unsigned long);
|
|
int __put_super(struct super_block *sb);
|
|
int __put_super_and_need_restart(struct super_block *sb);
|
|
void unnamed_dev_init(void);
|
|
|
|
/* 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 *);
|
|
extern struct vfsmount *kern_mount(struct file_system_type *);
|
|
extern int may_umount_tree(struct vfsmount *);
|
|
extern int may_umount(struct vfsmount *);
|
|
extern void umount_tree(struct vfsmount *, int, struct list_head *);
|
|
extern void release_mounts(struct list_head *);
|
|
extern long do_mount(char *, char *, char *, unsigned long, void *);
|
|
extern struct vfsmount *copy_tree(struct vfsmount *, struct dentry *, int);
|
|
extern void mnt_set_mountpoint(struct vfsmount *, struct dentry *,
|
|
struct vfsmount *);
|
|
|
|
extern int vfs_statfs(struct super_block *, struct kstatfs *);
|
|
|
|
/* /sys/fs */
|
|
extern struct subsystem fs_subsys;
|
|
|
|
#define FLOCK_VERIFY_READ 1
|
|
#define FLOCK_VERIFY_WRITE 2
|
|
|
|
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.
|
|
*/
|
|
#define MANDATORY_LOCK(inode) \
|
|
(IS_MANDLOCK(inode) && ((inode)->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
|
|
|
|
static inline int locks_verify_locked(struct inode *inode)
|
|
{
|
|
if (MANDATORY_LOCK(inode))
|
|
return locks_mandatory_locked(inode);
|
|
return 0;
|
|
}
|
|
|
|
extern int rw_verify_area(int, struct file *, loff_t *, size_t);
|
|
|
|
static inline int locks_verify_truncate(struct inode *inode,
|
|
struct file *filp,
|
|
loff_t size)
|
|
{
|
|
if (inode->i_flock && MANDATORY_LOCK(inode))
|
|
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;
|
|
}
|
|
|
|
/* fs/open.c */
|
|
|
|
extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs,
|
|
struct file *filp);
|
|
extern long do_sys_open(int fdf, const char __user *filename, int flags,
|
|
int mode);
|
|
extern struct file *filp_open(const char *, int, int);
|
|
extern struct file * dentry_open(struct dentry *, struct vfsmount *, int);
|
|
extern int filp_close(struct file *, fl_owner_t id);
|
|
extern char * getname(const char __user *);
|
|
|
|
/* fs/dcache.c */
|
|
extern void __init vfs_caches_init_early(void);
|
|
extern void __init vfs_caches_init(unsigned long);
|
|
|
|
#define __getname() kmem_cache_alloc(names_cachep, SLAB_KERNEL)
|
|
#define __putname(name) kmem_cache_free(names_cachep, (void *)(name))
|
|
#ifndef CONFIG_AUDITSYSCALL
|
|
#define putname(name) __putname(name)
|
|
#else
|
|
extern void putname(const char *name);
|
|
#endif
|
|
|
|
extern int register_blkdev(unsigned int, const char *);
|
|
extern int unregister_blkdev(unsigned int, const char *);
|
|
extern struct block_device *bdget(dev_t);
|
|
extern void bd_set_size(struct block_device *, loff_t size);
|
|
extern void bd_forget(struct inode *inode);
|
|
extern void bdput(struct block_device *);
|
|
extern struct block_device *open_by_devnum(dev_t, unsigned);
|
|
extern struct file_operations def_blk_fops;
|
|
extern struct address_space_operations def_blk_aops;
|
|
extern struct file_operations def_chr_fops;
|
|
extern struct file_operations bad_sock_fops;
|
|
extern struct file_operations def_fifo_fops;
|
|
extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long);
|
|
extern int blkdev_ioctl(struct inode *, struct file *, unsigned, unsigned long);
|
|
extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long);
|
|
extern int blkdev_get(struct block_device *, mode_t, unsigned);
|
|
extern int blkdev_put(struct block_device *);
|
|
extern int bd_claim(struct block_device *, void *);
|
|
extern void bd_release(struct block_device *);
|
|
|
|
/* fs/char_dev.c */
|
|
extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *);
|
|
extern int register_chrdev_region(dev_t, unsigned, const char *);
|
|
extern int register_chrdev(unsigned int, const char *,
|
|
struct file_operations *);
|
|
extern int unregister_chrdev(unsigned int, const char *);
|
|
extern void unregister_chrdev_region(dev_t, unsigned);
|
|
extern int chrdev_open(struct inode *, struct file *);
|
|
extern int get_chrdev_list(char *);
|
|
extern void *acquire_chrdev_list(void);
|
|
extern int count_chrdev_list(void);
|
|
extern void *get_next_chrdev(void *);
|
|
extern int get_chrdev_info(void *, int *, char **);
|
|
extern void release_chrdev_list(void *);
|
|
|
|
/* fs/block_dev.c */
|
|
#define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
|
|
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 *);
|
|
extern struct block_device *open_bdev_excl(const char *, int, void *);
|
|
extern void close_bdev_excl(struct block_device *);
|
|
extern void *acquire_blkdev_list(void);
|
|
extern int count_blkdev_list(void);
|
|
extern void *get_next_blkdev(void *);
|
|
extern int get_blkdev_info(void *, int *, char **);
|
|
extern void release_blkdev_list(void *);
|
|
|
|
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 *);
|
|
|
|
extern struct file_operations read_fifo_fops;
|
|
extern struct file_operations write_fifo_fops;
|
|
extern struct file_operations rdwr_fifo_fops;
|
|
|
|
extern int fs_may_remount_ro(struct super_block *);
|
|
|
|
/*
|
|
* 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)
|
|
|
|
extern int check_disk_change(struct block_device *);
|
|
extern int invalidate_inodes(struct super_block *);
|
|
extern int __invalidate_device(struct block_device *);
|
|
extern int invalidate_partition(struct gendisk *, int);
|
|
unsigned long invalidate_mapping_pages(struct address_space *mapping,
|
|
pgoff_t start, pgoff_t end);
|
|
unsigned long invalidate_inode_pages(struct address_space *mapping);
|
|
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))
|
|
invalidate_inode_pages(inode->i_mapping);
|
|
}
|
|
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 *);
|
|
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);
|
|
extern void sync_supers(void);
|
|
extern void sync_filesystems(int wait);
|
|
extern void emergency_sync(void);
|
|
extern void emergency_remount(void);
|
|
extern int do_remount_sb(struct super_block *sb, int flags,
|
|
void *data, int force);
|
|
extern sector_t bmap(struct inode *, sector_t);
|
|
extern int notify_change(struct dentry *, struct iattr *);
|
|
extern int permission(struct inode *, int, struct nameidata *);
|
|
extern int generic_permission(struct inode *, int,
|
|
int (*check_acl)(struct inode *, int));
|
|
|
|
extern int get_write_access(struct inode *);
|
|
extern int deny_write_access(struct file *);
|
|
static inline void put_write_access(struct inode * inode)
|
|
{
|
|
atomic_dec(&inode->i_writecount);
|
|
}
|
|
static inline void allow_write_access(struct file *file)
|
|
{
|
|
if (file)
|
|
atomic_inc(&file->f_dentry->d_inode->i_writecount);
|
|
}
|
|
extern int do_pipe(int *);
|
|
|
|
extern int open_namei(int dfd, const char *, int, int, struct nameidata *);
|
|
extern int may_open(struct nameidata *, int, int);
|
|
|
|
extern int kernel_read(struct file *, unsigned long, char *, unsigned long);
|
|
extern struct file * open_exec(const char *);
|
|
|
|
/* fs/dcache.c -- generic fs support functions */
|
|
extern int is_subdir(struct dentry *, struct dentry *);
|
|
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);
|
|
|
|
extern void inode_init_once(struct inode *);
|
|
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);
|
|
extern void generic_delete_inode(struct inode *inode);
|
|
extern void generic_drop_inode(struct inode *inode);
|
|
|
|
extern struct inode *ilookup5_nowait(struct super_block *sb,
|
|
unsigned long hashval, int (*test)(struct inode *, void *),
|
|
void *data);
|
|
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);
|
|
extern void unlock_new_inode(struct inode *);
|
|
|
|
static inline struct inode *iget(struct super_block *sb, unsigned long ino)
|
|
{
|
|
struct inode *inode = iget_locked(sb, ino);
|
|
|
|
if (inode && (inode->i_state & I_NEW)) {
|
|
sb->s_op->read_inode(inode);
|
|
unlock_new_inode(inode);
|
|
}
|
|
|
|
return inode;
|
|
}
|
|
|
|
extern void __iget(struct inode * inode);
|
|
extern void clear_inode(struct inode *);
|
|
extern void destroy_inode(struct inode *);
|
|
extern struct inode *new_inode(struct super_block *);
|
|
extern int remove_suid(struct dentry *);
|
|
extern void remove_dquot_ref(struct super_block *, int, struct list_head *);
|
|
extern struct semaphore iprune_sem;
|
|
|
|
extern void __insert_inode_hash(struct inode *, unsigned long hashval);
|
|
extern void remove_inode_hash(struct inode *);
|
|
static inline void insert_inode_hash(struct inode *inode) {
|
|
__insert_inode_hash(inode, inode->i_ino);
|
|
}
|
|
|
|
extern struct file * get_empty_filp(void);
|
|
extern void file_move(struct file *f, struct list_head *list);
|
|
extern void file_kill(struct file *f);
|
|
struct bio;
|
|
extern void submit_bio(int, struct bio *);
|
|
extern int bdev_read_only(struct block_device *);
|
|
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);
|
|
extern int file_send_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size);
|
|
extern ssize_t generic_file_read(struct file *, char __user *, size_t, loff_t *);
|
|
int generic_write_checks(struct file *file, loff_t *pos, size_t *count, int isblk);
|
|
extern ssize_t generic_file_write(struct file *, const char __user *, size_t, loff_t *);
|
|
extern ssize_t generic_file_aio_read(struct kiocb *, char __user *, size_t, loff_t);
|
|
extern ssize_t __generic_file_aio_read(struct kiocb *, const struct iovec *, unsigned long, loff_t *);
|
|
extern ssize_t generic_file_aio_write(struct kiocb *, const char __user *, size_t, loff_t);
|
|
extern ssize_t generic_file_aio_write_nolock(struct kiocb *, const struct iovec *,
|
|
unsigned long, loff_t *);
|
|
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);
|
|
ssize_t generic_file_write_nolock(struct file *file, const struct iovec *iov,
|
|
unsigned long nr_segs, loff_t *ppos);
|
|
extern ssize_t generic_file_sendfile(struct file *, loff_t *, size_t, read_actor_t, void *);
|
|
extern void do_generic_mapping_read(struct address_space *mapping,
|
|
struct file_ra_state *, struct file *,
|
|
loff_t *, read_descriptor_t *, read_actor_t);
|
|
extern void
|
|
file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping);
|
|
extern ssize_t generic_file_readv(struct file *filp, const struct iovec *iov,
|
|
unsigned long nr_segs, loff_t *ppos);
|
|
ssize_t generic_file_writev(struct file *filp, const struct iovec *iov,
|
|
unsigned long nr_segs, loff_t *ppos);
|
|
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);
|
|
extern loff_t remote_llseek(struct file *file, loff_t offset, int origin);
|
|
extern int generic_file_open(struct inode * inode, struct file * filp);
|
|
extern int nonseekable_open(struct inode * inode, struct file * filp);
|
|
|
|
#ifdef CONFIG_FS_XIP
|
|
extern ssize_t xip_file_read(struct file *filp, char __user *buf, size_t len,
|
|
loff_t *ppos);
|
|
extern ssize_t xip_file_sendfile(struct file *in_file, loff_t *ppos,
|
|
size_t count, read_actor_t actor,
|
|
void *target);
|
|
extern int xip_file_mmap(struct file * file, struct vm_area_struct * vma);
|
|
extern ssize_t xip_file_write(struct file *filp, const char __user *buf,
|
|
size_t len, loff_t *ppos);
|
|
extern int xip_truncate_page(struct address_space *mapping, loff_t from);
|
|
#else
|
|
static inline int xip_truncate_page(struct address_space *mapping, loff_t from)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static inline void do_generic_file_read(struct file * filp, loff_t *ppos,
|
|
read_descriptor_t * desc,
|
|
read_actor_t actor)
|
|
{
|
|
do_generic_mapping_read(filp->f_mapping,
|
|
&filp->f_ra,
|
|
filp,
|
|
ppos,
|
|
desc,
|
|
actor);
|
|
}
|
|
|
|
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_blocks_t get_blocks, dio_iodone_t end_io,
|
|
int lock_type);
|
|
|
|
enum {
|
|
DIO_LOCKING = 1, /* need locking between buffered and direct access */
|
|
DIO_NO_LOCKING, /* bdev; no locking at all between buffered/direct */
|
|
DIO_OWN_LOCKING, /* filesystem locks buffered and direct internally */
|
|
};
|
|
|
|
static inline 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_blocks_t get_blocks,
|
|
dio_iodone_t end_io)
|
|
{
|
|
return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
|
|
nr_segs, get_blocks, end_io, DIO_LOCKING);
|
|
}
|
|
|
|
static inline ssize_t blockdev_direct_IO_no_locking(int rw, struct kiocb *iocb,
|
|
struct inode *inode, struct block_device *bdev, const struct iovec *iov,
|
|
loff_t offset, unsigned long nr_segs, get_blocks_t get_blocks,
|
|
dio_iodone_t end_io)
|
|
{
|
|
return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
|
|
nr_segs, get_blocks, end_io, DIO_NO_LOCKING);
|
|
}
|
|
|
|
static inline ssize_t blockdev_direct_IO_own_locking(int rw, struct kiocb *iocb,
|
|
struct inode *inode, struct block_device *bdev, const struct iovec *iov,
|
|
loff_t offset, unsigned long nr_segs, get_blocks_t get_blocks,
|
|
dio_iodone_t end_io)
|
|
{
|
|
return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
|
|
nr_segs, get_blocks, end_io, DIO_OWN_LOCKING);
|
|
}
|
|
|
|
extern struct file_operations generic_ro_fops;
|
|
|
|
#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);
|
|
extern void *page_follow_link_light(struct dentry *, struct nameidata *);
|
|
extern void page_put_link(struct dentry *, struct nameidata *, void *);
|
|
extern int __page_symlink(struct inode *inode, const char *symname, int len,
|
|
gfp_t gfp_mask);
|
|
extern int page_symlink(struct inode *inode, const char *symname, int len);
|
|
extern struct inode_operations page_symlink_inode_operations;
|
|
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 *);
|
|
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 *);
|
|
|
|
extern int vfs_stat(char __user *, struct kstat *);
|
|
extern int vfs_lstat(char __user *, struct kstat *);
|
|
extern int vfs_stat_fd(int dfd, char __user *, struct kstat *);
|
|
extern int vfs_lstat_fd(int dfd, char __user *, struct kstat *);
|
|
extern int vfs_fstat(unsigned int, struct kstat *);
|
|
|
|
extern int vfs_ioctl(struct file *, unsigned int, unsigned int, unsigned long);
|
|
|
|
extern struct file_system_type *get_fs_type(const char *name);
|
|
extern struct super_block *get_super(struct block_device *);
|
|
extern struct super_block *user_get_super(dev_t);
|
|
extern void drop_super(struct super_block *sb);
|
|
|
|
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);
|
|
extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *);
|
|
extern int simple_statfs(struct super_block *, struct kstatfs *);
|
|
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 *);
|
|
extern int simple_sync_file(struct file *, struct dentry *, int);
|
|
extern int simple_empty(struct dentry *);
|
|
extern int simple_readpage(struct file *file, struct page *page);
|
|
extern int simple_prepare_write(struct file *file, struct page *page,
|
|
unsigned offset, unsigned to);
|
|
extern int simple_commit_write(struct file *file, struct page *page,
|
|
unsigned offset, unsigned to);
|
|
|
|
extern struct dentry *simple_lookup(struct inode *, struct dentry *, struct nameidata *);
|
|
extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *);
|
|
extern struct file_operations simple_dir_operations;
|
|
extern struct inode_operations simple_dir_inode_operations;
|
|
struct tree_descr { char *name; struct file_operations *ops; int mode; };
|
|
struct dentry *d_alloc_name(struct dentry *, const char *);
|
|
extern int simple_fill_super(struct super_block *, int, struct tree_descr *);
|
|
extern int simple_pin_fs(char *name, struct vfsmount **mount, int *count);
|
|
extern void simple_release_fs(struct vfsmount **mount, int *count);
|
|
|
|
extern ssize_t simple_read_from_buffer(void __user *, size_t, loff_t *, const void *, size_t);
|
|
|
|
#ifdef CONFIG_MIGRATION
|
|
extern int buffer_migrate_page(struct page *, struct page *);
|
|
#else
|
|
#define buffer_migrate_page NULL
|
|
#endif
|
|
|
|
extern int inode_change_ok(struct inode *, struct iattr *);
|
|
extern int __must_check inode_setattr(struct inode *, struct iattr *);
|
|
|
|
extern void file_update_time(struct file *file);
|
|
|
|
static inline ino_t parent_ino(struct dentry *dentry)
|
|
{
|
|
ino_t res;
|
|
|
|
spin_lock(&dentry->d_lock);
|
|
res = dentry->d_parent->d_inode->i_ino;
|
|
spin_unlock(&dentry->d_lock);
|
|
return res;
|
|
}
|
|
|
|
/* kernel/fork.c */
|
|
extern int unshare_files(void);
|
|
|
|
/* 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);
|
|
|
|
static inline void simple_transaction_set(struct file *file, size_t n)
|
|
{
|
|
struct simple_transaction_argresp *ar = file->private_data;
|
|
|
|
BUG_ON(n > SIMPLE_TRANSACTION_LIMIT);
|
|
|
|
/*
|
|
* The barrier ensures that ar->size will really remain zero until
|
|
* ar->data is ready for reading.
|
|
*/
|
|
smp_mb();
|
|
ar->size = n;
|
|
}
|
|
|
|
/*
|
|
* 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); \
|
|
} \
|
|
static struct file_operations __fops = { \
|
|
.owner = THIS_MODULE, \
|
|
.open = __fops ## _open, \
|
|
.release = simple_attr_close, \
|
|
.read = simple_attr_read, \
|
|
.write = simple_attr_write, \
|
|
};
|
|
|
|
static inline void __attribute__((format(printf, 1, 2)))
|
|
__simple_attr_check_format(const char *fmt, ...)
|
|
{
|
|
/* don't do anything, just let the compiler check the arguments; */
|
|
}
|
|
|
|
int simple_attr_open(struct inode *inode, struct file *file,
|
|
u64 (*get)(void *), void (*set)(void *, u64),
|
|
const char *fmt);
|
|
int simple_attr_close(struct inode *inode, struct file *file);
|
|
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);
|
|
|
|
|
|
#ifdef CONFIG_SECURITY
|
|
static inline char *alloc_secdata(void)
|
|
{
|
|
return (char *)get_zeroed_page(GFP_KERNEL);
|
|
}
|
|
|
|
static inline void free_secdata(void *secdata)
|
|
{
|
|
free_page((unsigned long)secdata);
|
|
}
|
|
#else
|
|
static inline char *alloc_secdata(void)
|
|
{
|
|
return (char *)1;
|
|
}
|
|
|
|
static inline void free_secdata(void *secdata)
|
|
{ }
|
|
#endif /* CONFIG_SECURITY */
|
|
|
|
#endif /* __KERNEL__ */
|
|
#endif /* _LINUX_FS_H */
|