2 * linux/include/linux/ext3_fs_i.h
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)
11 * linux/include/linux/minix_fs_i.h
13 * Copyright (C) 1991, 1992 Linus Torvalds
16 #ifndef _LINUX_EXT3_FS_I
17 #define _LINUX_EXT3_FS_I
19 #include <linux/rwsem.h>
20 #include <linux/rbtree.h>
21 #include <linux/seqlock.h>
22 #include <linux/mutex.h>
23 #include <linux/extent_map.h>
25 /* data type for block offset of block group */
26 typedef int ext3_grpblk_t;
28 /* data type for filesystem-wide blocks number */
29 typedef unsigned long ext3_fsblk_t;
33 struct ext3_reserve_window {
34 ext3_fsblk_t _rsv_start; /* First byte reserved */
35 ext3_fsblk_t _rsv_end; /* Last byte reserved or 0 */
38 struct ext3_reserve_window_node {
39 struct rb_node rsv_node;
42 struct ext3_reserve_window rsv_window;
45 struct ext3_block_alloc_info {
46 /* information about reservation window */
47 struct ext3_reserve_window_node rsv_window_node;
49 * was i_next_alloc_block in ext3_inode_info
50 * is the logical (file-relative) number of the
51 * most-recently-allocated block in this file.
52 * We use this for detecting linearly ascending allocation requests.
54 __u32 last_alloc_logical_block;
56 * Was i_next_alloc_goal in ext3_inode_info
57 * is the *physical* companion to i_next_alloc_block.
58 * it the physical block number of the block which was most-recentl
59 * allocated to this file. This give us the goal (target) for the next
60 * allocation when we detect linearly ascending requests.
62 ext3_fsblk_t last_alloc_physical_block;
65 #define rsv_start rsv_window._rsv_start
66 #define rsv_end rsv_window._rsv_end
69 * third extended file system inode data in memory
71 struct ext3_inode_info {
72 __le32 i_data[15]; /* unconverted */
79 ext3_fsblk_t i_file_acl;
84 * i_block_group is the number of the block group which contains
85 * this file's inode. Constant across the lifetime of the inode,
86 * it is ued for making block allocation decisions - we try to
87 * place a file's data blocks near its inode block, and new inodes
88 * near to their parent directory's inode.
91 __u32 i_state; /* Dynamic state flags for ext3 */
93 /* block reservation info */
94 struct ext3_block_alloc_info *i_block_alloc_info;
96 __u32 i_dir_start_lookup;
97 #ifdef CONFIG_EXT3_FS_XATTR
99 * Extended attributes can be read independently of the main file
100 * data. Taking i_mutex even when reading would cause contention
101 * between readers of EAs and writers of regular file data, so
102 * instead we synchronize on xattr_sem when reading or changing
105 struct rw_semaphore xattr_sem;
107 #ifdef CONFIG_EXT3_FS_POSIX_ACL
108 struct posix_acl *i_acl;
109 struct posix_acl *i_default_acl;
112 struct list_head i_orphan; /* unlinked but open inodes */
115 * i_disksize keeps track of what the inode size is ON DISK, not
116 * in memory. During truncate, i_size is set to the new size by
117 * the VFS prior to calling ext3_truncate(), but the filesystem won't
118 * set i_disksize to 0 until the truncate is actually under way.
120 * The intent is that i_disksize always represents the blocks which
121 * are used by this file. This allows recovery to restart truncate
122 * on orphans if we crash during truncate. We actually write i_disksize
123 * into the on-disk inode when writing inodes out, instead of i_size.
125 * The only time when i_disksize and i_size may be different is when
126 * a truncate is in progress. The only things which change i_disksize
127 * are ext3_get_block (growth) and ext3_truncate (shrinkth).
131 /* on-disk additional length */
135 * truncate_mutex is for serialising ext3_truncate() against
136 * ext3_getblock(). In the 2.4 ext2 design, great chunks of inode's
137 * data tree are chopped off during truncate. We can't do that in
138 * ext3 because whenever we perform intermediate commits during
139 * truncate, the inode and all the metadata blocks *must* be in a
140 * consistent state which allows truncation of the orphans to restart
141 * during recovery. Hence we must fix the get_block-vs-truncate race
142 * by other means, so we have truncate_mutex.
144 struct mutex truncate_mutex;
145 struct inode vfs_inode;
147 struct extent_map_tree extent_tree;
150 #endif /* _LINUX_EXT3_FS_I */