141 lines
4.0 KiB
C
141 lines
4.0 KiB
C
/*
|
|
* ext4_i.h
|
|
*
|
|
* Copyright (C) 1992, 1993, 1994, 1995
|
|
* Remy Card (card@masi.ibp.fr)
|
|
* Laboratoire MASI - Institut Blaise Pascal
|
|
* Universite Pierre et Marie Curie (Paris VI)
|
|
*
|
|
* from
|
|
*
|
|
* linux/include/linux/minix_fs_i.h
|
|
*
|
|
* Copyright (C) 1991, 1992 Linus Torvalds
|
|
*/
|
|
|
|
#ifndef _EXT4_I
|
|
#define _EXT4_I
|
|
|
|
#include <linux/rwsem.h>
|
|
#include <linux/rbtree.h>
|
|
#include <linux/seqlock.h>
|
|
#include <linux/mutex.h>
|
|
|
|
/* data type for block offset of block group */
|
|
typedef int ext4_grpblk_t;
|
|
|
|
/* data type for filesystem-wide blocks number */
|
|
typedef unsigned long long ext4_fsblk_t;
|
|
|
|
/* data type for file logical block number */
|
|
typedef __u32 ext4_lblk_t;
|
|
|
|
/* data type for block group number */
|
|
typedef unsigned int ext4_group_t;
|
|
|
|
/*
|
|
* storage for cached extent
|
|
*/
|
|
struct ext4_ext_cache {
|
|
ext4_fsblk_t ec_start;
|
|
ext4_lblk_t ec_block;
|
|
__u32 ec_len; /* must be 32bit to return holes */
|
|
__u32 ec_type;
|
|
};
|
|
|
|
/*
|
|
* fourth extended file system inode data in memory
|
|
*/
|
|
struct ext4_inode_info {
|
|
__le32 i_data[15]; /* unconverted */
|
|
__u32 i_flags;
|
|
ext4_fsblk_t i_file_acl;
|
|
__u32 i_dtime;
|
|
|
|
/*
|
|
* i_block_group is the number of the block group which contains
|
|
* this file's inode. Constant across the lifetime of the inode,
|
|
* it is ued for making block allocation decisions - we try to
|
|
* place a file's data blocks near its inode block, and new inodes
|
|
* near to their parent directory's inode.
|
|
*/
|
|
ext4_group_t i_block_group;
|
|
__u32 i_state; /* Dynamic state flags for ext4 */
|
|
|
|
ext4_lblk_t i_dir_start_lookup;
|
|
#ifdef CONFIG_EXT4_FS_XATTR
|
|
/*
|
|
* Extended attributes can be read independently of the main file
|
|
* data. Taking i_mutex even when reading would cause contention
|
|
* between readers of EAs and writers of regular file data, so
|
|
* instead we synchronize on xattr_sem when reading or changing
|
|
* EAs.
|
|
*/
|
|
struct rw_semaphore xattr_sem;
|
|
#endif
|
|
#ifdef CONFIG_EXT4_FS_POSIX_ACL
|
|
struct posix_acl *i_acl;
|
|
struct posix_acl *i_default_acl;
|
|
#endif
|
|
|
|
struct list_head i_orphan; /* unlinked but open inodes */
|
|
|
|
/*
|
|
* i_disksize keeps track of what the inode size is ON DISK, not
|
|
* in memory. During truncate, i_size is set to the new size by
|
|
* the VFS prior to calling ext4_truncate(), but the filesystem won't
|
|
* set i_disksize to 0 until the truncate is actually under way.
|
|
*
|
|
* The intent is that i_disksize always represents the blocks which
|
|
* are used by this file. This allows recovery to restart truncate
|
|
* on orphans if we crash during truncate. We actually write i_disksize
|
|
* into the on-disk inode when writing inodes out, instead of i_size.
|
|
*
|
|
* The only time when i_disksize and i_size may be different is when
|
|
* a truncate is in progress. The only things which change i_disksize
|
|
* are ext4_get_block (growth) and ext4_truncate (shrinkth).
|
|
*/
|
|
loff_t i_disksize;
|
|
|
|
/*
|
|
* i_data_sem is for serialising ext4_truncate() against
|
|
* ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
|
|
* data tree are chopped off during truncate. We can't do that in
|
|
* ext4 because whenever we perform intermediate commits during
|
|
* truncate, the inode and all the metadata blocks *must* be in a
|
|
* consistent state which allows truncation of the orphans to restart
|
|
* during recovery. Hence we must fix the get_block-vs-truncate race
|
|
* by other means, so we have i_data_sem.
|
|
*/
|
|
struct rw_semaphore i_data_sem;
|
|
struct inode vfs_inode;
|
|
struct jbd2_inode jinode;
|
|
|
|
struct ext4_ext_cache i_cached_extent;
|
|
/*
|
|
* File creation time. Its function is same as that of
|
|
* struct timespec i_{a,c,m}time in the generic inode.
|
|
*/
|
|
struct timespec i_crtime;
|
|
|
|
/* mballoc */
|
|
struct list_head i_prealloc_list;
|
|
spinlock_t i_prealloc_lock;
|
|
|
|
/* ialloc */
|
|
ext4_group_t i_last_alloc_group;
|
|
|
|
/* allocation reservation info for delalloc */
|
|
unsigned int i_reserved_data_blocks;
|
|
unsigned int i_reserved_meta_blocks;
|
|
unsigned int i_allocated_meta_blocks;
|
|
unsigned short i_delalloc_reserved_flag;
|
|
|
|
/* on-disk additional length */
|
|
__u16 i_extra_isize;
|
|
|
|
spinlock_t i_block_reservation_lock;
|
|
};
|
|
|
|
#endif /* _EXT4_I */
|