1595 lines
53 KiB
C
Executable File
1595 lines
53 KiB
C
Executable File
#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/linkage.h>
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#include <linux/limits.h>
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#include <linux/wait.h>
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#include <linux/types.h>
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#include <linux/vfs.h>
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#include <linux/net.h>
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#include <linux/kdev_t.h>
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#include <linux/ioctl.h>
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#include <linux/list.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/stddef.h>
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#include <linux/string.h>
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#include <asm/atomic.h>
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#include <asm/bitops.h>
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struct poll_table_struct;
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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 NR_OPEN (24*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, dir_notify_enable, lease_break_time;
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#define NR_FILE 8192 /* this can well be larger on a larger system */
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#define NR_RESERVED_FILES 10 /* reserved for root */
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#define NR_SUPER 256
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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 FMODE_READ 1
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#define FMODE_WRITE 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 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_NO_DCACHE 2 /* Only dcache the necessary things. */
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#define FS_NO_PRELIM 4 /* prevent preloading of dentries, even if
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* FS_NO_DCACHE is not set.
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*/
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#define FS_SINGLE 8 /* Filesystem that can have only one superblock */
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#define FS_NOMOUNT 16 /* Never mount from userland */
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#define FS_LITTER 32 /* Keeps the tree in dcache */
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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_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_REC 16384
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#define MS_VERBOSE 32768
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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_QUOTA 4 /* Quota initialized for file */
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#define S_APPEND 8 /* Append-only file */
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#define S_IMMUTABLE 16 /* Immutable file */
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#define S_DEAD 32 /* removed, but still open directory */
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#define S_NOQUOTA 64 /* Inode is not counted to quota */
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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) || ((inode)->i_flags & S_SYNC))
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#define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK)
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#define IS_QUOTAINIT(inode) ((inode)->i_flags & S_QUOTA)
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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_DEADDIR(inode) ((inode)->i_flags & S_DEAD)
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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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#define BLKELVGET _IOR(0x12,106,sizeof(blkelv_ioctl_arg_t))/* elevator get */
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#define BLKELVSET _IOW(0x12,107,sizeof(blkelv_ioctl_arg_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,sizeof(int))
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#define BLKBSZSET _IOW(0x12,113,sizeof(int))
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#define BLKGETSIZE64 _IOR(0x12,114,sizeof(u64)) /* 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 <asm/semaphore.h>
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#include <asm/byteorder.h>
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extern void update_atime (struct inode *);
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#define UPDATE_ATIME(inode) update_atime (inode)
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extern void buffer_init(unsigned long);
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extern void inode_init(unsigned long);
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extern void mnt_init(unsigned long);
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/* bh state bits */
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enum bh_state_bits {
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BH_Uptodate, /* 1 if the buffer contains valid data */
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BH_Dirty, /* 1 if the buffer is dirty */
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BH_Lock, /* 1 if the buffer is locked */
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BH_Req, /* 0 if the buffer has been invalidated */
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BH_Mapped, /* 1 if the buffer has a disk mapping */
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BH_New, /* 1 if the buffer is new and not yet written out */
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BH_Async, /* 1 if the buffer is under end_buffer_io_async I/O */
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BH_Wait_IO, /* 1 if we should write out this buffer */
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BH_launder, /* 1 if we should throttle on this buffer */
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BH_JBD, /* 1 if it has an attached journal_head */
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BH_PrivateStart,/* not a state bit, but the first bit available
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* for private allocation by other entities
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*/
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};
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/*
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* Try to keep the most commonly used fields in single cache lines (16
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* bytes) to improve performance. This ordering should be
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* particularly beneficial on 32-bit processors.
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*
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* We use the first 16 bytes for the data which is used in searches
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* over the block hash lists (ie. getblk() and friends).
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*
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* The second 16 bytes we use for lru buffer scans, as used by
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* sync_buffers() and refill_freelist(). -- sct
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*/
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struct buffer_head {
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/* First cache line: */
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struct buffer_head *b_next; /* Hash queue list */
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unsigned long b_blocknr; /* block number */
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unsigned short b_size; /* block size */
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unsigned short b_list; /* List that this buffer appears */
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kdev_t b_dev; /* device (B_FREE = free) */
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atomic_t b_count; /* users using this block */
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kdev_t b_rdev; /* Real device */
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unsigned long b_state; /* buffer state bitmap (see above) */
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unsigned long b_flushtime; /* Time when (dirty) buffer should be written */
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struct buffer_head *b_next_free;/* lru/free list linkage */
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struct buffer_head *b_prev_free;/* doubly linked list of buffers */
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struct buffer_head *b_this_page;/* circular list of buffers in one page */
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struct buffer_head *b_reqnext; /* request queue */
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struct buffer_head **b_pprev; /* doubly linked list of hash-queue */
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char * b_data; /* pointer to data block */
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struct page *b_page; /* the page this bh is mapped to */
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void (*b_end_io)(struct buffer_head *bh, int uptodate); /* I/O completion */
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void *b_private; /* reserved for b_end_io */
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unsigned long b_rsector; /* Real buffer location on disk */
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wait_queue_head_t b_wait;
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struct inode * b_inode;
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struct list_head b_inode_buffers; /* doubly linked list of inode dirty buffers */
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};
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typedef void (bh_end_io_t)(struct buffer_head *bh, int uptodate);
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void init_buffer(struct buffer_head *, bh_end_io_t *, void *);
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#define __buffer_state(bh, state) (((bh)->b_state & (1UL << BH_##state)) != 0)
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#define buffer_uptodate(bh) __buffer_state(bh,Uptodate)
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#define buffer_dirty(bh) __buffer_state(bh,Dirty)
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#define buffer_locked(bh) __buffer_state(bh,Lock)
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#define buffer_req(bh) __buffer_state(bh,Req)
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#define buffer_mapped(bh) __buffer_state(bh,Mapped)
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#define buffer_new(bh) __buffer_state(bh,New)
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#define buffer_async(bh) __buffer_state(bh,Async)
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#define bh_offset(bh) ((unsigned long)(bh)->b_data & ~PAGE_MASK)
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extern void set_bh_page(struct buffer_head *bh, struct page *page, unsigned long offset);
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#define touch_buffer(bh) mark_page_accessed(bh->b_page)
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#include <linux/pipe_fs_i.h>
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#include <linux/minix_fs_i.h>
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#include <linux/ext2_fs_i.h>
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#include <linux/ext3_fs_i.h>
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#include <linux/hpfs_fs_i.h>
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#include <linux/ntfs_fs_i.h>
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#include <linux/msdos_fs_i.h>
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#include <linux/umsdos_fs_i.h>
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#include <linux/iso_fs_i.h>
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#include <linux/nfs_fs_i.h>
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#include <linux/sysv_fs_i.h>
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#include <linux/affs_fs_i.h>
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#include <linux/ufs_fs_i.h>
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#include <linux/efs_fs_i.h>
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#include <linux/coda_fs_i.h>
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#include <linux/romfs_fs_i.h>
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#include <linux/shmem_fs.h>
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#include <linux/smb_fs_i.h>
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#include <linux/hfs_fs_i.h>
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#include <linux/adfs_fs_i.h>
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#include <linux/qnx4_fs_i.h>
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#include <linux/reiserfs_fs_i.h>
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#include <linux/bfs_fs_i.h>
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#include <linux/udf_fs_i.h>
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#include <linux/ncp_fs_i.h>
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#include <linux/proc_fs_i.h>
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#include <linux/usbdev_fs_i.h>
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#include <linux/jffs2_fs_i.h>
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#include <linux/cramfs_fs_sb.h>
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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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/*
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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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time_t ia_atime;
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time_t ia_mtime;
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time_t 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 and mount structures.
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*/
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#include <linux/quota.h>
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#include <linux/mount.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 kiobuf;
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struct address_space_operations {
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int (*writepage)(struct page *);
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int (*readpage)(struct file *, struct page *);
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int (*sync_page)(struct page *);
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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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int (*bmap)(struct address_space *, long);
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int (*flushpage) (struct page *, unsigned long);
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int (*releasepage) (struct page *, int);
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#define KERNEL_HAS_O_DIRECT /* this is for modules out of the kernel */
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int (*direct_IO)(int, struct inode *, struct kiobuf *, unsigned long, int);
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};
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struct address_space {
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struct list_head clean_pages; /* list of clean pages */
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struct list_head dirty_pages; /* list of dirty pages */
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struct list_head locked_pages; /* list of locked pages */
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unsigned long nrpages; /* number of total pages */
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struct address_space_operations *a_ops; /* methods */
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struct inode *host; /* owner: inode, block_device */
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struct vm_area_struct *i_mmap; /* list of private mappings */
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struct vm_area_struct *i_mmap_shared; /* list of shared mappings */
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spinlock_t i_shared_lock; /* and spinlock protecting it */
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int gfp_mask; /* how to allocate the pages */
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};
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struct char_device {
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struct list_head hash;
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atomic_t count;
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dev_t dev;
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atomic_t openers;
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struct semaphore sem;
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};
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struct block_device {
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struct list_head bd_hash;
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atomic_t bd_count;
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struct inode * bd_inode;
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dev_t bd_dev; /* not a kdev_t - it's a search key */
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int bd_openers;
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const struct block_device_operations *bd_op;
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struct semaphore bd_sem; /* open/close mutex */
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struct list_head bd_inodes;
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};
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struct inode {
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struct list_head i_hash;
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struct list_head i_list;
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struct list_head i_dentry;
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struct list_head i_dirty_buffers;
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struct list_head i_dirty_data_buffers;
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unsigned long i_ino;
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atomic_t i_count;
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kdev_t i_dev;
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umode_t i_mode;
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nlink_t i_nlink;
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uid_t i_uid;
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|
gid_t i_gid;
|
|
kdev_t i_rdev;
|
|
loff_t i_size;
|
|
time_t i_atime;
|
|
time_t i_mtime;
|
|
time_t i_ctime;
|
|
unsigned int i_blkbits;
|
|
unsigned long i_blksize;
|
|
unsigned long i_blocks;
|
|
unsigned long i_version;
|
|
struct semaphore i_sem;
|
|
struct semaphore i_zombie;
|
|
struct inode_operations *i_op;
|
|
struct file_operations *i_fop; /* former ->i_op->default_file_ops */
|
|
struct super_block *i_sb;
|
|
wait_queue_head_t i_wait;
|
|
struct file_lock *i_flock;
|
|
struct address_space *i_mapping;
|
|
struct address_space i_data;
|
|
struct dquot *i_dquot[MAXQUOTAS];
|
|
/* These three should probably be a union */
|
|
struct list_head i_devices;
|
|
struct pipe_inode_info *i_pipe;
|
|
struct block_device *i_bdev;
|
|
struct char_device *i_cdev;
|
|
|
|
unsigned long i_dnotify_mask; /* Directory notify events */
|
|
struct dnotify_struct *i_dnotify; /* for directory notifications */
|
|
|
|
unsigned long i_state;
|
|
|
|
unsigned int i_flags;
|
|
unsigned char i_sock;
|
|
|
|
atomic_t i_writecount;
|
|
unsigned int i_attr_flags;
|
|
__u32 i_generation;
|
|
union {
|
|
struct minix_inode_info minix_i;
|
|
struct ext2_inode_info ext2_i;
|
|
struct ext3_inode_info ext3_i;
|
|
struct hpfs_inode_info hpfs_i;
|
|
struct ntfs_inode_info ntfs_i;
|
|
struct msdos_inode_info msdos_i;
|
|
struct umsdos_inode_info umsdos_i;
|
|
struct iso_inode_info isofs_i;
|
|
struct nfs_inode_info nfs_i;
|
|
struct sysv_inode_info sysv_i;
|
|
struct affs_inode_info affs_i;
|
|
struct ufs_inode_info ufs_i;
|
|
struct efs_inode_info efs_i;
|
|
struct romfs_inode_info romfs_i;
|
|
struct shmem_inode_info shmem_i;
|
|
struct coda_inode_info coda_i;
|
|
struct smb_inode_info smbfs_i;
|
|
struct hfs_inode_info hfs_i;
|
|
struct adfs_inode_info adfs_i;
|
|
struct qnx4_inode_info qnx4_i;
|
|
struct reiserfs_inode_info reiserfs_i;
|
|
struct bfs_inode_info bfs_i;
|
|
struct udf_inode_info udf_i;
|
|
struct ncp_inode_info ncpfs_i;
|
|
struct proc_inode_info proc_i;
|
|
struct socket socket_i;
|
|
struct usbdev_inode_info usbdev_i;
|
|
struct jffs2_inode_info jffs2_i;
|
|
void *generic_ip;
|
|
} u;
|
|
};
|
|
|
|
struct fown_struct {
|
|
int pid; /* pid or -pgrp where SIGIO should be sent */
|
|
uid_t uid, euid; /* uid/euid of process setting the owner */
|
|
int signum; /* posix.1b rt signal to be delivered on IO */
|
|
};
|
|
|
|
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;
|
|
unsigned long f_reada, f_ramax, f_raend, f_ralen, f_rawin;
|
|
struct fown_struct f_owner;
|
|
unsigned int f_uid, f_gid;
|
|
int f_error;
|
|
|
|
unsigned long f_version;
|
|
|
|
/* needed for tty driver, and maybe others */
|
|
void *private_data;
|
|
|
|
/* preallocated helper kiobuf to speedup O_DIRECT */
|
|
struct kiobuf *f_iobuf;
|
|
long f_iobuf_lock;
|
|
};
|
|
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)
|
|
|
|
extern int init_private_file(struct file *, struct dentry *, int);
|
|
|
|
#define MAX_NON_LFS ((1UL<<31) - 1)
|
|
|
|
#define FL_POSIX 1
|
|
#define FL_FLOCK 2
|
|
#define FL_BROKEN 4 /* broken flock() emulation */
|
|
#define FL_ACCESS 8 /* for processes suspended by mandatory locking */
|
|
#define FL_LOCKD 16 /* lock held by rpc.lockd */
|
|
#define FL_LEASE 32 /* lease held on this file */
|
|
|
|
/*
|
|
* 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 {
|
|
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;
|
|
|
|
void (*fl_notify)(struct file_lock *); /* unblock callback */
|
|
void (*fl_insert)(struct file_lock *); /* lock insertion callback */
|
|
void (*fl_remove)(struct file_lock *); /* lock removal callback */
|
|
|
|
struct fasync_struct * fl_fasync; /* for lease break notifications */
|
|
|
|
union {
|
|
struct nfs_lock_info nfs_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(unsigned int, struct flock *);
|
|
extern int fcntl_setlk(unsigned int, unsigned int, struct flock *);
|
|
|
|
extern int fcntl_getlk64(unsigned int, struct flock64 *);
|
|
extern int fcntl_setlk64(unsigned int, unsigned int, struct flock64 *);
|
|
|
|
/* 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 *, unsigned int);
|
|
extern void posix_block_lock(struct file_lock *, struct file_lock *);
|
|
extern void posix_unblock_lock(struct file_lock *);
|
|
extern int posix_locks_deadlock(struct file_lock *, struct file_lock *);
|
|
extern int __get_lease(struct inode *inode, unsigned int flags);
|
|
extern time_t lease_get_mtime(struct inode *);
|
|
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);
|
|
|
|
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);
|
|
|
|
struct nameidata {
|
|
struct dentry *dentry;
|
|
struct vfsmount *mnt;
|
|
struct qstr last;
|
|
unsigned int flags;
|
|
int last_type;
|
|
};
|
|
|
|
#define DQUOT_USR_ENABLED 0x01 /* User diskquotas enabled */
|
|
#define DQUOT_GRP_ENABLED 0x02 /* Group diskquotas enabled */
|
|
|
|
struct quota_mount_options
|
|
{
|
|
unsigned int flags; /* Flags for diskquotas on this device */
|
|
struct semaphore dqio_sem; /* lock device while I/O in progress */
|
|
struct semaphore dqoff_sem; /* serialize quota_off() and quota_on() on device */
|
|
struct file *files[MAXQUOTAS]; /* fp's to quotafiles */
|
|
time_t inode_expire[MAXQUOTAS]; /* expiretime for inode-quota */
|
|
time_t block_expire[MAXQUOTAS]; /* expiretime for block-quota */
|
|
char rsquash[MAXQUOTAS]; /* for quotas threat root as any other user */
|
|
};
|
|
|
|
/*
|
|
* Umount options
|
|
*/
|
|
|
|
#define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */
|
|
#define MNT_DETACH 0x00000002 /* Just detach from the tree */
|
|
|
|
#include <linux/minix_fs_sb.h>
|
|
#include <linux/ext2_fs_sb.h>
|
|
#include <linux/ext3_fs_sb.h>
|
|
#include <linux/hpfs_fs_sb.h>
|
|
#include <linux/ntfs_fs_sb.h>
|
|
#include <linux/msdos_fs_sb.h>
|
|
#include <linux/iso_fs_sb.h>
|
|
#include <linux/nfs_fs_sb.h>
|
|
#include <linux/sysv_fs_sb.h>
|
|
#include <linux/affs_fs_sb.h>
|
|
#include <linux/ufs_fs_sb.h>
|
|
#include <linux/efs_fs_sb.h>
|
|
#include <linux/romfs_fs_sb.h>
|
|
#include <linux/smb_fs_sb.h>
|
|
#include <linux/hfs_fs_sb.h>
|
|
#include <linux/adfs_fs_sb.h>
|
|
#include <linux/qnx4_fs_sb.h>
|
|
#include <linux/reiserfs_fs_sb.h>
|
|
#include <linux/bfs_fs_sb.h>
|
|
#include <linux/udf_fs_sb.h>
|
|
#include <linux/ncp_fs_sb.h>
|
|
#include <linux/usbdev_fs_sb.h>
|
|
#include <linux/cramfs_fs_sb.h>
|
|
#include <linux/jffs2_fs_sb.h>
|
|
|
|
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 */
|
|
kdev_t s_dev;
|
|
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;
|
|
unsigned long s_flags;
|
|
unsigned long s_magic;
|
|
struct dentry *s_root;
|
|
struct rw_semaphore s_umount;
|
|
struct semaphore s_lock;
|
|
int s_count;
|
|
atomic_t s_active;
|
|
|
|
struct list_head s_dirty; /* dirty inodes */
|
|
struct list_head s_locked_inodes;/* inodes being synced */
|
|
struct list_head s_files;
|
|
|
|
struct block_device *s_bdev;
|
|
struct list_head s_instances;
|
|
struct quota_mount_options s_dquot; /* Diskquota specific options */
|
|
|
|
union {
|
|
struct minix_sb_info minix_sb;
|
|
struct ext2_sb_info ext2_sb;
|
|
struct ext3_sb_info ext3_sb;
|
|
struct hpfs_sb_info hpfs_sb;
|
|
struct ntfs_sb_info ntfs_sb;
|
|
struct msdos_sb_info msdos_sb;
|
|
struct isofs_sb_info isofs_sb;
|
|
struct nfs_sb_info nfs_sb;
|
|
struct sysv_sb_info sysv_sb;
|
|
struct affs_sb_info affs_sb;
|
|
struct ufs_sb_info ufs_sb;
|
|
struct efs_sb_info efs_sb;
|
|
struct shmem_sb_info shmem_sb;
|
|
struct romfs_sb_info romfs_sb;
|
|
struct smb_sb_info smbfs_sb;
|
|
struct hfs_sb_info hfs_sb;
|
|
struct adfs_sb_info adfs_sb;
|
|
struct qnx4_sb_info qnx4_sb;
|
|
struct reiserfs_sb_info reiserfs_sb;
|
|
struct bfs_sb_info bfs_sb;
|
|
struct udf_sb_info udf_sb;
|
|
struct ncp_sb_info ncpfs_sb;
|
|
struct usbdev_sb_info usbdevfs_sb;
|
|
struct jffs2_sb_info jffs2_sb;
|
|
struct cramfs_sb_info cramfs_sb;
|
|
void *generic_sbp;
|
|
} u;
|
|
/*
|
|
* 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 */
|
|
|
|
/* The next field is used by knfsd when converting a (inode number based)
|
|
* file handle into a dentry. As it builds a path in the dcache tree from
|
|
* the bottom up, there may for a time be a subpath of dentrys which is not
|
|
* connected to the main tree. This semaphore ensure that there is only ever
|
|
* one such free path per filesystem. Note that unconnected files (or other
|
|
* non-directories) are allowed, but not unconnected diretories.
|
|
*/
|
|
struct semaphore s_nfsd_free_path_sem;
|
|
};
|
|
|
|
/*
|
|
* VFS helper functions..
|
|
*/
|
|
extern int vfs_create(struct inode *, struct dentry *, int);
|
|
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 *);
|
|
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 *);
|
|
|
|
/*
|
|
* File types
|
|
*/
|
|
#define DT_UNKNOWN 0
|
|
#define DT_FIFO 1
|
|
#define DT_CHR 2
|
|
#define DT_DIR 4
|
|
#define DT_BLK 6
|
|
#define DT_REG 8
|
|
#define DT_LNK 10
|
|
#define DT_SOCK 12
|
|
#define DT_WHT 14
|
|
|
|
/*
|
|
* This is the "filldir" function type, used by readdir() to let
|
|
* the kernel specify what kind of dirent layout it wants to have.
|
|
* This allows the kernel to read directories into kernel space or
|
|
* to have different dirent layouts depending on the binary type.
|
|
*/
|
|
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);
|
|
int (*check_media_change) (kdev_t);
|
|
int (*revalidate) (kdev_t);
|
|
struct module *owner;
|
|
#ifdef MAGIC_ROM_PTR
|
|
int (*romptr) (kdev_t, struct vm_area_struct *);
|
|
#endif /* MAGIC_ROM_PTR */
|
|
};
|
|
|
|
/*
|
|
* NOTE:
|
|
* read, write, poll, fsync, readv, writev 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 *, size_t, loff_t *);
|
|
ssize_t (*write) (struct file *, const char *, 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);
|
|
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 (*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 (*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);
|
|
#ifdef MAGIC_ROM_PTR
|
|
int (*romptr) (struct file *, struct vm_area_struct *);
|
|
#endif /* MAGIC_ROM_PTR */
|
|
};
|
|
|
|
struct inode_operations {
|
|
int (*create) (struct inode *,struct dentry *,int);
|
|
struct dentry * (*lookup) (struct inode *,struct dentry *);
|
|
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,int);
|
|
int (*rename) (struct inode *, struct dentry *,
|
|
struct inode *, struct dentry *);
|
|
int (*readlink) (struct dentry *, char *,int);
|
|
int (*follow_link) (struct dentry *, struct nameidata *);
|
|
void (*truncate) (struct inode *);
|
|
int (*permission) (struct inode *, int);
|
|
int (*revalidate) (struct dentry *);
|
|
int (*setattr) (struct dentry *, struct iattr *);
|
|
int (*getattr) (struct dentry *, struct iattr *);
|
|
};
|
|
|
|
struct seq_file;
|
|
|
|
/*
|
|
* NOTE: write_inode, delete_inode, clear_inode, put_inode can be called
|
|
* without the big kernel lock held in all filesystems.
|
|
*/
|
|
struct super_operations {
|
|
void (*read_inode) (struct inode *);
|
|
|
|
/* reiserfs kludge. reiserfs needs 64 bits of information to
|
|
** find an inode. We are using the read_inode2 call to get
|
|
** that information. We don't like this, and are waiting on some
|
|
** VFS changes for the real solution.
|
|
** iget4 calls read_inode2, iff it is defined
|
|
*/
|
|
void (*read_inode2) (struct inode *, void *) ;
|
|
void (*dirty_inode) (struct inode *);
|
|
void (*write_inode) (struct inode *, int);
|
|
void (*put_inode) (struct inode *);
|
|
void (*delete_inode) (struct inode *);
|
|
void (*put_super) (struct super_block *);
|
|
void (*write_super) (struct super_block *);
|
|
void (*write_super_lockfs) (struct super_block *);
|
|
void (*unlockfs) (struct super_block *);
|
|
int (*statfs) (struct super_block *, struct statfs *);
|
|
int (*remount_fs) (struct super_block *, int *, char *);
|
|
void (*clear_inode) (struct inode *);
|
|
void (*umount_begin) (struct super_block *);
|
|
|
|
/* Following are for knfsd to interact with "interesting" filesystems
|
|
* Currently just reiserfs, but possibly FAT and others later
|
|
*
|
|
* fh_to_dentry is given a filehandle fragement with length, and a type flag
|
|
* and must return a dentry for the referenced object or, if "parent" is
|
|
* set, a dentry for the parent of the object.
|
|
* If a dentry cannot be found, a "root" dentry should be created and
|
|
* flaged as DCACHE_NFSD_DISCONNECTED. nfsd_iget is an example implementation.
|
|
*
|
|
* dentry_to_fh is given a dentry and must generate the filesys specific
|
|
* part of the file handle. Available length is passed in *lenp and used
|
|
* length should be returned therein.
|
|
* If need_parent is set, then dentry_to_fh should encode sufficient information
|
|
* to find the (current) parent.
|
|
* dentry_to_fh should return a 1byte "type" which will be passed back in
|
|
* the fhtype arguement to fh_to_dentry. Type of 0 is reserved.
|
|
* If filesystem was exportable before the introduction of fh_to_dentry,
|
|
* types 1 and 2 should be used is that same way as the generic code.
|
|
* Type 255 means error.
|
|
*
|
|
* Lengths are in units of 4bytes, not bytes.
|
|
*/
|
|
struct dentry * (*fh_to_dentry)(struct super_block *sb, __u32 *fh, int len, int fhtype, int parent);
|
|
int (*dentry_to_fh)(struct dentry *, __u32 *fh, int *lenp, int need_parent);
|
|
int (*show_options)(struct seq_file *, struct vfsmount *);
|
|
};
|
|
|
|
/* Inode state bits.. */
|
|
#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 8
|
|
#define I_FREEING 16
|
|
#define I_CLEAR 32
|
|
|
|
#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 mark_inode_dirty_pages(struct inode *inode)
|
|
{
|
|
__mark_inode_dirty(inode, I_DIRTY_PAGES);
|
|
}
|
|
|
|
struct dquot_operations {
|
|
void (*initialize) (struct inode *, short);
|
|
void (*drop) (struct inode *);
|
|
int (*alloc_block) (struct inode *, unsigned long, char);
|
|
int (*alloc_inode) (const struct inode *, unsigned long);
|
|
void (*free_block) (struct inode *, unsigned long);
|
|
void (*free_inode) (const struct inode *, unsigned long);
|
|
int (*transfer) (struct inode *, struct iattr *);
|
|
};
|
|
|
|
struct file_system_type {
|
|
const char *name;
|
|
int fs_flags;
|
|
struct super_block *(*read_super) (struct super_block *, void *, int);
|
|
struct module *owner;
|
|
struct file_system_type * next;
|
|
struct list_head fs_supers;
|
|
};
|
|
|
|
#define DECLARE_FSTYPE(var,type,read,flags) \
|
|
struct file_system_type var = { \
|
|
name: type, \
|
|
read_super: read, \
|
|
fs_flags: flags, \
|
|
owner: THIS_MODULE, \
|
|
}
|
|
|
|
#define DECLARE_FSTYPE_DEV(var,type,read) \
|
|
DECLARE_FSTYPE(var,type,read,FS_REQUIRES_DEV)
|
|
|
|
/* Alas, no aliases. Too much hassle with bringing module.h everywhere */
|
|
#define fops_get(fops) \
|
|
(((fops) && (fops)->owner) \
|
|
? ( try_inc_mod_count((fops)->owner) ? (fops) : NULL ) \
|
|
: (fops))
|
|
|
|
#define fops_put(fops) \
|
|
do { \
|
|
if ((fops) && (fops)->owner) \
|
|
__MOD_DEC_USE_COUNT((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(struct vfsmount *);
|
|
extern long do_mount(char *, char *, char *, unsigned long, void *);
|
|
|
|
#define kern_umount mntput
|
|
|
|
extern int vfs_statfs(struct super_block *, struct statfs *);
|
|
|
|
/* Return value for VFS lock functions - tells locks.c to lock conventionally
|
|
* REALLY kosha for root NFS and nfs_lock
|
|
*/
|
|
#define LOCK_USE_CLNT 1
|
|
|
|
#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;
|
|
}
|
|
|
|
static inline int locks_verify_area(int read_write, struct inode *inode,
|
|
struct file *filp, loff_t offset,
|
|
size_t count)
|
|
{
|
|
if (inode->i_flock && MANDATORY_LOCK(inode))
|
|
return locks_mandatory_area(read_write, inode, filp, offset, count);
|
|
return 0;
|
|
}
|
|
|
|
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 get_lease(struct inode *inode, unsigned int mode)
|
|
{
|
|
if (inode->i_flock && (inode->i_flock->fl_flags & FL_LEASE))
|
|
return __get_lease(inode, mode);
|
|
return 0;
|
|
}
|
|
|
|
/* fs/open.c */
|
|
|
|
asmlinkage long sys_open(const char *, int, int);
|
|
asmlinkage long sys_close(unsigned int); /* yes, it's really unsigned */
|
|
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 *);
|
|
|
|
/* fs/dcache.c */
|
|
extern void vfs_caches_init(unsigned long);
|
|
|
|
#define __getname() kmem_cache_alloc(names_cachep, SLAB_KERNEL)
|
|
#define putname(name) kmem_cache_free(names_cachep, (void *)(name))
|
|
|
|
enum {BDEV_FILE, BDEV_SWAP, BDEV_FS, BDEV_RAW};
|
|
extern int register_blkdev(unsigned int, const char *, struct block_device_operations *);
|
|
extern int unregister_blkdev(unsigned int, const char *);
|
|
extern struct block_device *bdget(dev_t);
|
|
extern int bd_acquire(struct inode *inode);
|
|
extern void bd_forget(struct inode *inode);
|
|
extern void bdput(struct block_device *);
|
|
extern struct char_device *cdget(dev_t);
|
|
extern void cdput(struct char_device *);
|
|
extern int blkdev_open(struct inode *, struct file *);
|
|
extern int blkdev_close(struct inode *, struct file *);
|
|
extern struct file_operations def_blk_fops;
|
|
extern struct address_space_operations def_blk_aops;
|
|
extern struct file_operations def_fifo_fops;
|
|
extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long);
|
|
extern int blkdev_get(struct block_device *, mode_t, unsigned, int);
|
|
extern int blkdev_put(struct block_device *, int);
|
|
|
|
/* fs/devices.c */
|
|
extern const struct block_device_operations *get_blkfops(unsigned int);
|
|
extern int register_chrdev(unsigned int, const char *, struct file_operations *);
|
|
extern int unregister_chrdev(unsigned int, const char *);
|
|
extern int chrdev_open(struct inode *, struct file *);
|
|
extern const char * bdevname(kdev_t);
|
|
extern const char * cdevname(kdev_t);
|
|
extern const char * kdevname(kdev_t);
|
|
extern void init_special_inode(struct inode *, umode_t, int);
|
|
|
|
/* 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 *);
|
|
|
|
extern int try_to_free_buffers(struct page *, unsigned int);
|
|
extern void refile_buffer(struct buffer_head * buf);
|
|
extern void create_empty_buffers(struct page *, kdev_t, unsigned long);
|
|
extern void end_buffer_io_sync(struct buffer_head *bh, int uptodate);
|
|
|
|
/* reiserfs_writepage needs this */
|
|
extern void set_buffer_async_io(struct buffer_head *bh) ;
|
|
|
|
#define BUF_CLEAN 0
|
|
#define BUF_LOCKED 1 /* Buffers scheduled for write */
|
|
#define BUF_DIRTY 2 /* Dirty buffers, not yet scheduled for write */
|
|
#define NR_LIST 3
|
|
|
|
static inline void get_bh(struct buffer_head * bh)
|
|
{
|
|
atomic_inc(&(bh)->b_count);
|
|
}
|
|
|
|
static inline void put_bh(struct buffer_head *bh)
|
|
{
|
|
smp_mb__before_atomic_dec();
|
|
atomic_dec(&bh->b_count);
|
|
}
|
|
|
|
/*
|
|
* This is called by bh->b_end_io() handlers when I/O has completed.
|
|
*/
|
|
static inline void mark_buffer_uptodate(struct buffer_head * bh, int on)
|
|
{
|
|
if (on)
|
|
set_bit(BH_Uptodate, &bh->b_state);
|
|
else
|
|
clear_bit(BH_Uptodate, &bh->b_state);
|
|
}
|
|
|
|
#define atomic_set_buffer_clean(bh) test_and_clear_bit(BH_Dirty, &(bh)->b_state)
|
|
|
|
static inline void __mark_buffer_clean(struct buffer_head *bh)
|
|
{
|
|
refile_buffer(bh);
|
|
}
|
|
|
|
static inline void mark_buffer_clean(struct buffer_head * bh)
|
|
{
|
|
if (atomic_set_buffer_clean(bh))
|
|
__mark_buffer_clean(bh);
|
|
}
|
|
|
|
extern void FASTCALL(__mark_dirty(struct buffer_head *bh));
|
|
extern void FASTCALL(__mark_buffer_dirty(struct buffer_head *bh));
|
|
extern void FASTCALL(mark_buffer_dirty(struct buffer_head *bh));
|
|
extern void FASTCALL(buffer_insert_inode_data_queue(struct buffer_head *, struct inode *));
|
|
|
|
#define atomic_set_buffer_dirty(bh) test_and_set_bit(BH_Dirty, &(bh)->b_state)
|
|
|
|
static inline void mark_buffer_async(struct buffer_head * bh, int on)
|
|
{
|
|
if (on)
|
|
set_bit(BH_Async, &bh->b_state);
|
|
else
|
|
clear_bit(BH_Async, &bh->b_state);
|
|
}
|
|
|
|
/*
|
|
* If an error happens during the make_request, this function
|
|
* has to be recalled. It marks the buffer as clean and not
|
|
* uptodate, and it notifys the upper layer about the end
|
|
* of the I/O.
|
|
*/
|
|
static inline void buffer_IO_error(struct buffer_head * bh)
|
|
{
|
|
mark_buffer_clean(bh);
|
|
/*
|
|
* b_end_io has to clear the BH_Uptodate bitflag in the error case!
|
|
*/
|
|
bh->b_end_io(bh, 0);
|
|
}
|
|
|
|
extern void buffer_insert_inode_queue(struct buffer_head *, struct inode *);
|
|
static inline void mark_buffer_dirty_inode(struct buffer_head *bh, struct inode *inode)
|
|
{
|
|
mark_buffer_dirty(bh);
|
|
buffer_insert_inode_queue(bh, inode);
|
|
}
|
|
|
|
extern void set_buffer_flushtime(struct buffer_head *);
|
|
extern void balance_dirty(void);
|
|
extern int check_disk_change(kdev_t);
|
|
extern int invalidate_inodes(struct super_block *);
|
|
extern int invalidate_device(kdev_t, int);
|
|
extern void invalidate_inode_pages(struct inode *);
|
|
extern void invalidate_inode_pages2(struct address_space *);
|
|
extern void invalidate_inode_buffers(struct inode *);
|
|
#define invalidate_buffers(dev) __invalidate_buffers((dev), 0)
|
|
#define destroy_buffers(dev) __invalidate_buffers((dev), 1)
|
|
extern void invalidate_bdev(struct block_device *, int);
|
|
extern void __invalidate_buffers(kdev_t dev, int);
|
|
extern void sync_inodes(kdev_t);
|
|
extern void sync_unlocked_inodes(void);
|
|
extern void write_inode_now(struct inode *, int);
|
|
extern int sync_buffers(kdev_t, int);
|
|
extern void sync_dev(kdev_t);
|
|
extern int fsync_dev(kdev_t);
|
|
extern int fsync_super(struct super_block *);
|
|
extern int fsync_no_super(kdev_t);
|
|
extern void sync_inodes_sb(struct super_block *);
|
|
extern int osync_inode_buffers(struct inode *);
|
|
extern int osync_inode_data_buffers(struct inode *);
|
|
extern int fsync_inode_buffers(struct inode *);
|
|
extern int fsync_inode_data_buffers(struct inode *);
|
|
extern int inode_has_buffers(struct inode *);
|
|
extern void filemap_fdatasync(struct address_space *);
|
|
extern void filemap_fdatawait(struct address_space *);
|
|
extern void sync_supers(kdev_t);
|
|
extern int bmap(struct inode *, int);
|
|
extern int notify_change(struct dentry *, struct iattr *);
|
|
extern int permission(struct inode *, int);
|
|
extern int vfs_permission(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 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 *);
|
|
|
|
/*
|
|
* Kernel pointers have redundant information, so we can use a
|
|
* scheme where we can return either an error code or a dentry
|
|
* pointer with the same return value.
|
|
*
|
|
* This should be a per-architecture thing, to allow different
|
|
* error and pointer decisions.
|
|
*/
|
|
static inline void *ERR_PTR(long error)
|
|
{
|
|
return (void *) error;
|
|
}
|
|
|
|
static inline long PTR_ERR(const void *ptr)
|
|
{
|
|
return (long) ptr;
|
|
}
|
|
|
|
static inline long IS_ERR(const void *ptr)
|
|
{
|
|
return (unsigned long)ptr > (unsigned long)-1000L;
|
|
}
|
|
|
|
/*
|
|
* The bitmask for a lookup event:
|
|
* - follow links at the end
|
|
* - require a directory
|
|
* - ending slashes ok even for nonexistent files
|
|
* - internal "there are more path compnents" flag
|
|
*/
|
|
#define LOOKUP_FOLLOW (1)
|
|
#define LOOKUP_DIRECTORY (2)
|
|
#define LOOKUP_CONTINUE (4)
|
|
#define LOOKUP_POSITIVE (8)
|
|
#define LOOKUP_PARENT (16)
|
|
#define LOOKUP_NOALT (32)
|
|
/*
|
|
* Type of the last component on LOOKUP_PARENT
|
|
*/
|
|
enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT, LAST_BIND};
|
|
|
|
/*
|
|
* "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;
|
|
char * buf;
|
|
int error;
|
|
} read_descriptor_t;
|
|
|
|
typedef int (*read_actor_t)(read_descriptor_t *, struct page *, unsigned long, unsigned long);
|
|
|
|
/* needed for stackable file system support */
|
|
extern loff_t default_llseek(struct file *file, loff_t offset, int origin);
|
|
|
|
extern int FASTCALL(__user_walk(const char *, unsigned, struct nameidata *));
|
|
extern int FASTCALL(path_init(const char *, unsigned, struct nameidata *));
|
|
extern int FASTCALL(path_walk(const char *, struct nameidata *));
|
|
extern int FASTCALL(link_path_walk(const char *, struct nameidata *));
|
|
extern void path_release(struct nameidata *);
|
|
extern int follow_down(struct vfsmount **, struct dentry **);
|
|
extern int follow_up(struct vfsmount **, struct dentry **);
|
|
extern struct dentry * lookup_one_len(const char *, struct dentry *, int);
|
|
extern struct dentry * lookup_hash(struct qstr *, struct dentry *);
|
|
#define user_path_walk(name,nd) __user_walk(name, LOOKUP_FOLLOW|LOOKUP_POSITIVE, nd)
|
|
#define user_path_walk_link(name,nd) __user_walk(name, LOOKUP_POSITIVE, nd)
|
|
|
|
extern void iput(struct inode *);
|
|
extern void force_delete(struct inode *);
|
|
extern struct inode * igrab(struct inode *);
|
|
extern ino_t iunique(struct super_block *, ino_t);
|
|
|
|
typedef int (*find_inode_t)(struct inode *, unsigned long, void *);
|
|
extern struct inode * iget4(struct super_block *, unsigned long, find_inode_t, void *);
|
|
static inline struct inode *iget(struct super_block *sb, unsigned long ino)
|
|
{
|
|
return iget4(sb, ino, NULL, NULL);
|
|
}
|
|
|
|
extern void clear_inode(struct inode *);
|
|
extern struct inode * get_empty_inode(void);
|
|
|
|
static inline struct inode * new_inode(struct super_block *sb)
|
|
{
|
|
struct inode *inode = get_empty_inode();
|
|
if (inode) {
|
|
inode->i_sb = sb;
|
|
inode->i_dev = sb->s_dev;
|
|
inode->i_blkbits = sb->s_blocksize_bits;
|
|
}
|
|
return inode;
|
|
}
|
|
extern void remove_suid(struct inode *inode);
|
|
|
|
extern void insert_inode_hash(struct inode *);
|
|
extern void remove_inode_hash(struct inode *);
|
|
extern struct file * get_empty_filp(void);
|
|
extern void file_move(struct file *f, struct list_head *list);
|
|
extern struct buffer_head * get_hash_table(kdev_t, int, int);
|
|
extern struct buffer_head * getblk(kdev_t, int, int);
|
|
extern void ll_rw_block(int, int, struct buffer_head * bh[]);
|
|
extern void submit_bh(int, struct buffer_head *);
|
|
extern int is_read_only(kdev_t);
|
|
extern void __brelse(struct buffer_head *);
|
|
static inline void brelse(struct buffer_head *buf)
|
|
{
|
|
if (buf)
|
|
__brelse(buf);
|
|
}
|
|
extern void __bforget(struct buffer_head *);
|
|
static inline void bforget(struct buffer_head *buf)
|
|
{
|
|
if (buf)
|
|
__bforget(buf);
|
|
}
|
|
extern int set_blocksize(kdev_t, int);
|
|
extern struct buffer_head * bread(kdev_t, int, int);
|
|
extern void wakeup_bdflush(void);
|
|
extern void put_unused_buffer_head(struct buffer_head * bh);
|
|
extern struct buffer_head * get_unused_buffer_head(int async);
|
|
|
|
extern int brw_page(int, struct page *, kdev_t, int [], int);
|
|
|
|
typedef int (get_block_t)(struct inode*,long,struct buffer_head*,int);
|
|
|
|
/* Generic buffer handling for block filesystems.. */
|
|
extern int try_to_release_page(struct page * page, int gfp_mask);
|
|
extern int discard_bh_page(struct page *, unsigned long, int);
|
|
#define block_flushpage(page, offset) discard_bh_page(page, offset, 1)
|
|
#define block_invalidate_page(page) discard_bh_page(page, 0, 0)
|
|
extern int block_symlink(struct inode *, const char *, int);
|
|
extern int block_write_full_page(struct page*, get_block_t*);
|
|
extern int block_read_full_page(struct page*, get_block_t*);
|
|
extern int block_prepare_write(struct page*, unsigned, unsigned, get_block_t*);
|
|
extern int cont_prepare_write(struct page*, unsigned, unsigned, get_block_t*,
|
|
unsigned long *);
|
|
extern int block_commit_write(struct page *page, unsigned from, unsigned to);
|
|
extern int block_sync_page(struct page *);
|
|
|
|
int generic_block_bmap(struct address_space *, long, get_block_t *);
|
|
int generic_commit_write(struct file *, struct page *, unsigned, unsigned);
|
|
int block_truncate_page(struct address_space *, loff_t, get_block_t *);
|
|
extern int generic_direct_IO(int, struct inode *, struct kiobuf *, unsigned long, int, get_block_t *);
|
|
|
|
extern int waitfor_one_page(struct page*);
|
|
extern int generic_file_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 ssize_t generic_file_read(struct file *, char *, size_t, loff_t *);
|
|
extern ssize_t generic_file_write(struct file *, const char *, size_t, loff_t *);
|
|
extern void do_generic_file_read(struct file *, loff_t *, read_descriptor_t *, read_actor_t);
|
|
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 ssize_t generic_read_dir(struct file *, char *, size_t, loff_t *);
|
|
extern int generic_file_open(struct inode * inode, struct file * filp);
|
|
|
|
extern struct file_operations generic_ro_fops;
|
|
|
|
extern int vfs_readlink(struct dentry *, char *, int, const char *);
|
|
extern int vfs_follow_link(struct nameidata *, const char *);
|
|
extern int page_readlink(struct dentry *, char *, int);
|
|
extern int page_follow_link(struct dentry *, struct nameidata *);
|
|
extern struct inode_operations page_symlink_inode_operations;
|
|
|
|
extern int vfs_readdir(struct file *, filldir_t, void *);
|
|
extern int dcache_readdir(struct file *, void *, filldir_t);
|
|
|
|
extern struct file_system_type *get_fs_type(const char *name);
|
|
extern struct super_block *get_super(kdev_t);
|
|
extern void drop_super(struct super_block *sb);
|
|
static inline int is_mounted(kdev_t dev)
|
|
{
|
|
struct super_block *sb = get_super(dev);
|
|
if (sb) {
|
|
drop_super(sb);
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
unsigned long generate_cluster(kdev_t, int b[], int);
|
|
unsigned long generate_cluster_swab32(kdev_t, int b[], int);
|
|
extern kdev_t ROOT_DEV;
|
|
extern char root_device_name[];
|
|
|
|
|
|
extern void show_buffers(void);
|
|
extern void mount_root(void);
|
|
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
extern unsigned int real_root_dev;
|
|
extern int change_root(kdev_t, const char *);
|
|
#endif
|
|
|
|
extern ssize_t char_read(struct file *, char *, size_t, loff_t *);
|
|
extern ssize_t block_read(struct file *, char *, size_t, loff_t *);
|
|
extern int read_ahead[];
|
|
|
|
extern ssize_t char_write(struct file *, const char *, size_t, loff_t *);
|
|
extern ssize_t block_write(struct file *, const char *, size_t, loff_t *);
|
|
|
|
extern int file_fsync(struct file *, struct dentry *, int);
|
|
extern int generic_buffer_fdatasync(struct inode *inode, unsigned long start_idx, unsigned long end_idx);
|
|
extern int generic_osync_inode(struct inode *, int);
|
|
#define OSYNC_METADATA (1<<0)
|
|
#define OSYNC_DATA (1<<1)
|
|
#define OSYNC_INODE (1<<2)
|
|
|
|
extern int inode_change_ok(struct inode *, struct iattr *);
|
|
extern int inode_setattr(struct inode *, struct iattr *);
|
|
|
|
/*
|
|
* Common dentry functions for inclusion in the VFS
|
|
* or in other stackable file systems. Some of these
|
|
* functions were in linux/fs/ C (VFS) files.
|
|
*
|
|
*/
|
|
|
|
/*
|
|
* Locking the parent is needed to:
|
|
* - serialize directory operations
|
|
* - make sure the parent doesn't change from
|
|
* under us in the middle of an operation.
|
|
*
|
|
* NOTE! Right now we'd rather use a "struct inode"
|
|
* for this, but as I expect things to move toward
|
|
* using dentries instead for most things it is
|
|
* probably better to start with the conceptually
|
|
* better interface of relying on a path of dentries.
|
|
*/
|
|
static inline struct dentry *lock_parent(struct dentry *dentry)
|
|
{
|
|
struct dentry *dir = dget(dentry->d_parent);
|
|
|
|
down(&dir->d_inode->i_sem);
|
|
return dir;
|
|
}
|
|
|
|
static inline struct dentry *get_parent(struct dentry *dentry)
|
|
{
|
|
return dget(dentry->d_parent);
|
|
}
|
|
|
|
static inline void unlock_dir(struct dentry *dir)
|
|
{
|
|
up(&dir->d_inode->i_sem);
|
|
dput(dir);
|
|
}
|
|
|
|
/*
|
|
* Whee.. Deadlock country. Happily there are only two VFS
|
|
* operations that does this..
|
|
*/
|
|
static inline void double_down(struct semaphore *s1, struct semaphore *s2)
|
|
{
|
|
if (s1 != s2) {
|
|
if ((unsigned long) s1 < (unsigned long) s2) {
|
|
struct semaphore *tmp = s2;
|
|
s2 = s1; s1 = tmp;
|
|
}
|
|
down(s1);
|
|
}
|
|
down(s2);
|
|
}
|
|
|
|
/*
|
|
* Ewwwwwwww... _triple_ lock. We are guaranteed that the 3rd argument is
|
|
* not equal to 1st and not equal to 2nd - the first case (target is parent of
|
|
* source) would be already caught, the second is plain impossible (target is
|
|
* its own parent and that case would be caught even earlier). Very messy.
|
|
* I _think_ that it works, but no warranties - please, look it through.
|
|
* Pox on bloody lusers who mandated overwriting rename() for directories...
|
|
*/
|
|
|
|
static inline void triple_down(struct semaphore *s1,
|
|
struct semaphore *s2,
|
|
struct semaphore *s3)
|
|
{
|
|
if (s1 != s2) {
|
|
if ((unsigned long) s1 < (unsigned long) s2) {
|
|
if ((unsigned long) s1 < (unsigned long) s3) {
|
|
struct semaphore *tmp = s3;
|
|
s3 = s1; s1 = tmp;
|
|
}
|
|
if ((unsigned long) s1 < (unsigned long) s2) {
|
|
struct semaphore *tmp = s2;
|
|
s2 = s1; s1 = tmp;
|
|
}
|
|
} else {
|
|
if ((unsigned long) s1 < (unsigned long) s3) {
|
|
struct semaphore *tmp = s3;
|
|
s3 = s1; s1 = tmp;
|
|
}
|
|
if ((unsigned long) s2 < (unsigned long) s3) {
|
|
struct semaphore *tmp = s3;
|
|
s3 = s2; s2 = tmp;
|
|
}
|
|
}
|
|
down(s1);
|
|
} else if ((unsigned long) s2 < (unsigned long) s3) {
|
|
struct semaphore *tmp = s3;
|
|
s3 = s2; s2 = tmp;
|
|
}
|
|
down(s2);
|
|
down(s3);
|
|
}
|
|
|
|
static inline void double_up(struct semaphore *s1, struct semaphore *s2)
|
|
{
|
|
up(s1);
|
|
if (s1 != s2)
|
|
up(s2);
|
|
}
|
|
|
|
static inline void triple_up(struct semaphore *s1,
|
|
struct semaphore *s2,
|
|
struct semaphore *s3)
|
|
{
|
|
up(s1);
|
|
if (s1 != s2)
|
|
up(s2);
|
|
up(s3);
|
|
}
|
|
|
|
static inline void double_lock(struct dentry *d1, struct dentry *d2)
|
|
{
|
|
double_down(&d1->d_inode->i_sem, &d2->d_inode->i_sem);
|
|
}
|
|
|
|
static inline void double_unlock(struct dentry *d1, struct dentry *d2)
|
|
{
|
|
double_up(&d1->d_inode->i_sem,&d2->d_inode->i_sem);
|
|
dput(d1);
|
|
dput(d2);
|
|
}
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif /* _LINUX_FS_H */
|