blob: 18a6ce98537f5d033ac1a2abb6c2937ac0ca9148 [file] [log] [blame]
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001/*
Mingming Cao617ba132006-10-11 01:20:53 -07002 * linux/include/linux/ext4_fs_i.h
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/include/linux/minix_fs_i.h
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 */
15
Mingming Cao617ba132006-10-11 01:20:53 -070016#ifndef _LINUX_EXT4_FS_I
17#define _LINUX_EXT4_FS_I
Dave Kleikampac27a0e2006-10-11 01:20:50 -070018
19#include <linux/rwsem.h>
20#include <linux/rbtree.h>
21#include <linux/seqlock.h>
22#include <linux/mutex.h>
23
24/* data type for block offset of block group */
Mingming Cao617ba132006-10-11 01:20:53 -070025typedef int ext4_grpblk_t;
Dave Kleikampac27a0e2006-10-11 01:20:50 -070026
27/* data type for filesystem-wide blocks number */
Mingming Cao617ba132006-10-11 01:20:53 -070028typedef unsigned long ext4_fsblk_t;
Dave Kleikampac27a0e2006-10-11 01:20:50 -070029
30#define E3FSBLK "%lu"
31
Mingming Cao617ba132006-10-11 01:20:53 -070032struct ext4_reserve_window {
33 ext4_fsblk_t _rsv_start; /* First byte reserved */
34 ext4_fsblk_t _rsv_end; /* Last byte reserved or 0 */
Dave Kleikampac27a0e2006-10-11 01:20:50 -070035};
36
Mingming Cao617ba132006-10-11 01:20:53 -070037struct ext4_reserve_window_node {
Dave Kleikampac27a0e2006-10-11 01:20:50 -070038 struct rb_node rsv_node;
39 __u32 rsv_goal_size;
40 __u32 rsv_alloc_hit;
Mingming Cao617ba132006-10-11 01:20:53 -070041 struct ext4_reserve_window rsv_window;
Dave Kleikampac27a0e2006-10-11 01:20:50 -070042};
43
Mingming Cao617ba132006-10-11 01:20:53 -070044struct ext4_block_alloc_info {
Dave Kleikampac27a0e2006-10-11 01:20:50 -070045 /* information about reservation window */
Mingming Cao617ba132006-10-11 01:20:53 -070046 struct ext4_reserve_window_node rsv_window_node;
Dave Kleikampac27a0e2006-10-11 01:20:50 -070047 /*
Mingming Cao617ba132006-10-11 01:20:53 -070048 * was i_next_alloc_block in ext4_inode_info
Dave Kleikampac27a0e2006-10-11 01:20:50 -070049 * is the logical (file-relative) number of the
50 * most-recently-allocated block in this file.
51 * We use this for detecting linearly ascending allocation requests.
52 */
53 __u32 last_alloc_logical_block;
54 /*
Mingming Cao617ba132006-10-11 01:20:53 -070055 * Was i_next_alloc_goal in ext4_inode_info
Dave Kleikampac27a0e2006-10-11 01:20:50 -070056 * is the *physical* companion to i_next_alloc_block.
57 * it the the physical block number of the block which was most-recentl
58 * allocated to this file. This give us the goal (target) for the next
59 * allocation when we detect linearly ascending requests.
60 */
Mingming Cao617ba132006-10-11 01:20:53 -070061 ext4_fsblk_t last_alloc_physical_block;
Dave Kleikampac27a0e2006-10-11 01:20:50 -070062};
63
64#define rsv_start rsv_window._rsv_start
65#define rsv_end rsv_window._rsv_end
66
67/*
68 * third extended file system inode data in memory
69 */
Mingming Cao617ba132006-10-11 01:20:53 -070070struct ext4_inode_info {
Dave Kleikampac27a0e2006-10-11 01:20:50 -070071 __le32 i_data[15]; /* unconverted */
72 __u32 i_flags;
Mingming Cao617ba132006-10-11 01:20:53 -070073#ifdef EXT4_FRAGMENTS
Dave Kleikampac27a0e2006-10-11 01:20:50 -070074 __u32 i_faddr;
75 __u8 i_frag_no;
76 __u8 i_frag_size;
77#endif
Mingming Cao617ba132006-10-11 01:20:53 -070078 ext4_fsblk_t i_file_acl;
Dave Kleikampac27a0e2006-10-11 01:20:50 -070079 __u32 i_dir_acl;
80 __u32 i_dtime;
81
82 /*
83 * i_block_group is the number of the block group which contains
84 * this file's inode. Constant across the lifetime of the inode,
85 * it is ued for making block allocation decisions - we try to
86 * place a file's data blocks near its inode block, and new inodes
87 * near to their parent directory's inode.
88 */
89 __u32 i_block_group;
Mingming Cao617ba132006-10-11 01:20:53 -070090 __u32 i_state; /* Dynamic state flags for ext4 */
Dave Kleikampac27a0e2006-10-11 01:20:50 -070091
92 /* block reservation info */
Mingming Cao617ba132006-10-11 01:20:53 -070093 struct ext4_block_alloc_info *i_block_alloc_info;
Dave Kleikampac27a0e2006-10-11 01:20:50 -070094
95 __u32 i_dir_start_lookup;
Mingming Cao617ba132006-10-11 01:20:53 -070096#ifdef CONFIG_EXT4DEV_FS_XATTR
Dave Kleikampac27a0e2006-10-11 01:20:50 -070097 /*
98 * Extended attributes can be read independently of the main file
99 * data. Taking i_mutex even when reading would cause contention
100 * between readers of EAs and writers of regular file data, so
101 * instead we synchronize on xattr_sem when reading or changing
102 * EAs.
103 */
104 struct rw_semaphore xattr_sem;
105#endif
Mingming Cao617ba132006-10-11 01:20:53 -0700106#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700107 struct posix_acl *i_acl;
108 struct posix_acl *i_default_acl;
109#endif
110
111 struct list_head i_orphan; /* unlinked but open inodes */
112
113 /*
114 * i_disksize keeps track of what the inode size is ON DISK, not
115 * in memory. During truncate, i_size is set to the new size by
Mingming Cao617ba132006-10-11 01:20:53 -0700116 * the VFS prior to calling ext4_truncate(), but the filesystem won't
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700117 * set i_disksize to 0 until the truncate is actually under way.
118 *
119 * The intent is that i_disksize always represents the blocks which
120 * are used by this file. This allows recovery to restart truncate
121 * on orphans if we crash during truncate. We actually write i_disksize
122 * into the on-disk inode when writing inodes out, instead of i_size.
123 *
124 * The only time when i_disksize and i_size may be different is when
125 * a truncate is in progress. The only things which change i_disksize
Mingming Cao617ba132006-10-11 01:20:53 -0700126 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700127 */
128 loff_t i_disksize;
129
130 /* on-disk additional length */
131 __u16 i_extra_isize;
132
133 /*
Mingming Cao617ba132006-10-11 01:20:53 -0700134 * truncate_mutex is for serialising ext4_truncate() against
135 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700136 * data tree are chopped off during truncate. We can't do that in
Mingming Cao617ba132006-10-11 01:20:53 -0700137 * ext4 because whenever we perform intermediate commits during
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700138 * truncate, the inode and all the metadata blocks *must* be in a
139 * consistent state which allows truncation of the orphans to restart
140 * during recovery. Hence we must fix the get_block-vs-truncate race
141 * by other means, so we have truncate_mutex.
142 */
143 struct mutex truncate_mutex;
144 struct inode vfs_inode;
145};
146
Mingming Cao617ba132006-10-11 01:20:53 -0700147#endif /* _LINUX_EXT4_FS_I */