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1da177e4 LT |
1 | /* |
2 | * linux/include/linux/ext3_fs_i.h | |
3 | * | |
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 | ||
16 | #ifndef _LINUX_EXT3_FS_I | |
17 | #define _LINUX_EXT3_FS_I | |
18 | ||
19 | #include <linux/rwsem.h> | |
20 | #include <linux/rbtree.h> | |
21 | #include <linux/seqlock.h> | |
97461518 | 22 | #include <linux/mutex.h> |
1da177e4 | 23 | |
1c2bf374 MC |
24 | /* data type for block offset of block group */ |
25 | typedef int ext3_grpblk_t; | |
26 | ||
27 | /* data type for filesystem-wide blocks number */ | |
28 | typedef unsigned long ext3_fsblk_t; | |
29 | ||
30 | #define E3FSBLK "%lu" | |
31 | ||
1da177e4 | 32 | struct ext3_reserve_window { |
43d23f90 MC |
33 | ext3_fsblk_t _rsv_start; /* First byte reserved */ |
34 | ext3_fsblk_t _rsv_end; /* Last byte reserved or 0 */ | |
1da177e4 LT |
35 | }; |
36 | ||
37 | struct ext3_reserve_window_node { | |
e9ad5620 | 38 | struct rb_node rsv_node; |
1da177e4 LT |
39 | __u32 rsv_goal_size; |
40 | __u32 rsv_alloc_hit; | |
41 | struct ext3_reserve_window rsv_window; | |
42 | }; | |
43 | ||
44 | struct ext3_block_alloc_info { | |
45 | /* information about reservation window */ | |
46 | struct ext3_reserve_window_node rsv_window_node; | |
47 | /* | |
48 | * was i_next_alloc_block in ext3_inode_info | |
49 | * 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 | /* | |
55 | * Was i_next_alloc_goal in ext3_inode_info | |
56 | * 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 | */ | |
43d23f90 | 61 | ext3_fsblk_t last_alloc_physical_block; |
1da177e4 LT |
62 | }; |
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 | */ | |
70 | struct ext3_inode_info { | |
71 | __le32 i_data[15]; /* unconverted */ | |
72 | __u32 i_flags; | |
73 | #ifdef EXT3_FRAGMENTS | |
74 | __u32 i_faddr; | |
75 | __u8 i_frag_no; | |
76 | __u8 i_frag_size; | |
77 | #endif | |
43d23f90 | 78 | ext3_fsblk_t i_file_acl; |
1da177e4 LT |
79 | __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; | |
90 | __u32 i_state; /* Dynamic state flags for ext3 */ | |
91 | ||
92 | /* block reservation info */ | |
93 | struct ext3_block_alloc_info *i_block_alloc_info; | |
94 | ||
95 | __u32 i_dir_start_lookup; | |
96 | #ifdef CONFIG_EXT3_FS_XATTR | |
97 | /* | |
98 | * Extended attributes can be read independently of the main file | |
1b1dcc1b | 99 | * data. Taking i_mutex even when reading would cause contention |
1da177e4 LT |
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 | |
106 | #ifdef CONFIG_EXT3_FS_POSIX_ACL | |
107 | 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 | |
116 | * the VFS prior to calling ext3_truncate(), but the filesystem won't | |
117 | * 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 | |
126 | * are ext3_get_block (growth) and ext3_truncate (shrinkth). | |
127 | */ | |
128 | loff_t i_disksize; | |
129 | ||
130 | /* on-disk additional length */ | |
131 | __u16 i_extra_isize; | |
132 | ||
133 | /* | |
97461518 | 134 | * truncate_mutex is for serialising ext3_truncate() against |
1da177e4 LT |
135 | * ext3_getblock(). In the 2.4 ext2 design, great chunks of inode's |
136 | * data tree are chopped off during truncate. We can't do that in | |
137 | * ext3 because whenever we perform intermediate commits during | |
138 | * 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 | |
97461518 | 141 | * by other means, so we have truncate_mutex. |
1da177e4 | 142 | */ |
97461518 | 143 | struct mutex truncate_mutex; |
1da177e4 LT |
144 | struct inode vfs_inode; |
145 | }; | |
146 | ||
147 | #endif /* _LINUX_EXT3_FS_I */ |