cc314eef01
This bug could cause oopses and page state corruption, because ncpfs used the generic page-cache symlink handlign functions. But those functions only work if the page cache is guaranteed to be "stable", ie a page that was installed when the symlink walk was started has to still be installed in the page cache at the end of the walk. We could have fixed ncpfs to not use the generic helper routines, but it is in many ways much cleaner to instead improve on the symlink walking helper routines so that they don't require that absolute stability. We do this by allowing "follow_link()" to return a error-pointer as a cookie, which is fed back to the cleanup "put_link()" routine. This also simplifies NFS symlink handling. Signed-off-by: Linus Torvalds <torvalds@osdl.org>
1778 lines
63 KiB
C
1778 lines
63 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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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 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_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|MS_NOATIME|\
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MS_NODIRATIME)
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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_NOATIME(inode) (__IS_FLG(inode, MS_NOATIME) || ((inode)->i_flags & S_NOATIME))
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#define IS_NODIRATIME(inode) __IS_FLG(inode, MS_NODIRATIME)
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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 <asm/atomic.h>
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#include <asm/semaphore.h>
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#include <asm/byteorder.h>
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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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/* Used to be a macro which just called the function, now just a function */
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extern void update_atime (struct inode *);
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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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/*
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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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unsigned int ia_attr_flags;
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};
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/*
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* This is the inode attributes flag definitions
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*/
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#define ATTR_FLAG_SYNCRONOUS 1 /* Syncronous write */
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#define ATTR_FLAG_NOATIME 2 /* Don't update atime */
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#define ATTR_FLAG_APPEND 4 /* Append-only file */
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#define ATTR_FLAG_IMMUTABLE 8 /* Immutable file */
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#define ATTR_FLAG_NODIRATIME 16 /* Don't update atime for directory */
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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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* 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 *, int);
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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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};
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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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{
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return !prio_tree_empty(&mapping->i_mmap) ||
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!list_empty(&mapping->i_mmap_nonlinear);
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}
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/*
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* Might pages of this file have been modified in userspace?
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* Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff
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* marks vma as VM_SHARED if it is shared, and the file was opened for
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* writing i.e. vma may be mprotected writable even if now readonly.
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*/
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static inline int mapping_writably_mapped(struct address_space *mapping)
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{
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return mapping->i_mmap_writable != 0;
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}
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/*
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* Use sequence counter to get consistent i_size on 32-bit processors.
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*/
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#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
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#include <linux/seqlock.h>
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#define __NEED_I_SIZE_ORDERED
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#define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount)
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#else
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#define i_size_ordered_init(inode) do { } while (0)
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#endif
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struct inode {
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struct hlist_node i_hash;
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struct list_head i_list;
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struct list_head i_sb_list;
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struct list_head i_dentry;
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unsigned long i_ino;
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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 semaphore i_sem;
|
|
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 {
|
|
struct list_head f_list;
|
|
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;
|
|
|
|
size_t f_maxcount;
|
|
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 void 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 long s_old_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 semaphore 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();
|
|
down(&sb->s_lock);
|
|
}
|
|
|
|
static inline void unlock_super(struct super_block * sb)
|
|
{
|
|
put_fs_excl();
|
|
up(&sb->s_lock);
|
|
}
|
|
|
|
/*
|
|
* VFS helper functions..
|
|
*/
|
|
extern int vfs_create(struct inode *, struct dentry *, int, struct nameidata *);
|
|
extern int vfs_mkdir(struct inode *, struct dentry *, int);
|
|
extern int vfs_mknod(struct inode *, struct dentry *, int, dev_t);
|
|
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);
|
|
|
|
/*
|
|
* 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 *);
|
|
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 *);
|
|
};
|
|
|
|
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);
|
|
}
|
|
|
|
static inline void touch_atime(struct vfsmount *mnt, struct dentry *dentry)
|
|
{
|
|
/* per-mountpoint checks will go here */
|
|
update_atime(dentry->d_inode);
|
|
}
|
|
|
|
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
|
|
*
|
|
* 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_sem 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_sem 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 long do_mount(char *, char *, char *, unsigned long, void *);
|
|
|
|
extern int vfs_statfs(struct super_block *, struct kstatfs *);
|
|
|
|
#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);
|
|
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 *);
|
|
|
|
/* 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 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 struct file_operations read_pipe_fops;
|
|
extern struct file_operations write_pipe_fops;
|
|
extern struct file_operations rdwr_pipe_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(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_direct_IO(int rw, struct kiocb *iocb,
|
|
const struct iovec *iov, loff_t offset, unsigned long nr_segs);
|
|
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);
|
|
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_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);
|
|
|
|
extern int inode_change_ok(struct inode *, struct iattr *);
|
|
extern int __must_check inode_setattr(struct inode *, struct iattr *);
|
|
|
|
extern void inode_update_time(struct inode *inode, int ctime_too);
|
|
|
|
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)
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{ }
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#endif /* CONFIG_SECURITY */
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#endif /* __KERNEL__ */
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#endif /* _LINUX_FS_H */
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