Commit | Line | Data |
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ac27a0ec | 1 | /* |
3dcf5451 | 2 | * ext4_i.h |
ac27a0ec DK |
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 | ||
3dcf5451 CH |
16 | #ifndef _EXT4_I |
17 | #define _EXT4_I | |
ac27a0ec DK |
18 | |
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 */ | |
617ba13b | 25 | typedef int ext4_grpblk_t; |
ac27a0ec DK |
26 | |
27 | /* data type for filesystem-wide blocks number */ | |
2ae02107 | 28 | typedef unsigned long long ext4_fsblk_t; |
ac27a0ec | 29 | |
725d26d3 AK |
30 | /* data type for file logical block number */ |
31 | typedef __u32 ext4_lblk_t; | |
32 | ||
fd2d4291 AM |
33 | /* data type for block group number */ |
34 | typedef unsigned long ext4_group_t; | |
35 | ||
ac27a0ec DK |
36 | #define rsv_start rsv_window._rsv_start |
37 | #define rsv_end rsv_window._rsv_end | |
38 | ||
a86c6181 AT |
39 | /* |
40 | * storage for cached extent | |
41 | */ | |
42 | struct ext4_ext_cache { | |
f65e6fba | 43 | ext4_fsblk_t ec_start; |
725d26d3 | 44 | ext4_lblk_t ec_block; |
f65e6fba AT |
45 | __u32 ec_len; /* must be 32bit to return holes */ |
46 | __u32 ec_type; | |
a86c6181 AT |
47 | }; |
48 | ||
ac27a0ec | 49 | /* |
8a35694e | 50 | * fourth extended file system inode data in memory |
ac27a0ec | 51 | */ |
617ba13b | 52 | struct ext4_inode_info { |
ac27a0ec DK |
53 | __le32 i_data[15]; /* unconverted */ |
54 | __u32 i_flags; | |
617ba13b | 55 | ext4_fsblk_t i_file_acl; |
ac27a0ec DK |
56 | __u32 i_dtime; |
57 | ||
58 | /* | |
59 | * i_block_group is the number of the block group which contains | |
60 | * this file's inode. Constant across the lifetime of the inode, | |
61 | * it is ued for making block allocation decisions - we try to | |
62 | * place a file's data blocks near its inode block, and new inodes | |
63 | * near to their parent directory's inode. | |
64 | */ | |
fd2d4291 | 65 | ext4_group_t i_block_group; |
617ba13b | 66 | __u32 i_state; /* Dynamic state flags for ext4 */ |
ac27a0ec | 67 | |
725d26d3 | 68 | ext4_lblk_t i_dir_start_lookup; |
03010a33 | 69 | #ifdef CONFIG_EXT4_FS_XATTR |
ac27a0ec DK |
70 | /* |
71 | * Extended attributes can be read independently of the main file | |
72 | * data. Taking i_mutex even when reading would cause contention | |
73 | * between readers of EAs and writers of regular file data, so | |
74 | * instead we synchronize on xattr_sem when reading or changing | |
75 | * EAs. | |
76 | */ | |
77 | struct rw_semaphore xattr_sem; | |
78 | #endif | |
03010a33 | 79 | #ifdef CONFIG_EXT4_FS_POSIX_ACL |
ac27a0ec DK |
80 | struct posix_acl *i_acl; |
81 | struct posix_acl *i_default_acl; | |
82 | #endif | |
83 | ||
84 | struct list_head i_orphan; /* unlinked but open inodes */ | |
85 | ||
86 | /* | |
87 | * i_disksize keeps track of what the inode size is ON DISK, not | |
88 | * in memory. During truncate, i_size is set to the new size by | |
617ba13b | 89 | * the VFS prior to calling ext4_truncate(), but the filesystem won't |
ac27a0ec DK |
90 | * set i_disksize to 0 until the truncate is actually under way. |
91 | * | |
92 | * The intent is that i_disksize always represents the blocks which | |
93 | * are used by this file. This allows recovery to restart truncate | |
94 | * on orphans if we crash during truncate. We actually write i_disksize | |
95 | * into the on-disk inode when writing inodes out, instead of i_size. | |
96 | * | |
97 | * The only time when i_disksize and i_size may be different is when | |
98 | * a truncate is in progress. The only things which change i_disksize | |
617ba13b | 99 | * are ext4_get_block (growth) and ext4_truncate (shrinkth). |
ac27a0ec DK |
100 | */ |
101 | loff_t i_disksize; | |
102 | ||
103 | /* on-disk additional length */ | |
104 | __u16 i_extra_isize; | |
105 | ||
106 | /* | |
0e855ac8 | 107 | * i_data_sem is for serialising ext4_truncate() against |
617ba13b | 108 | * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's |
ac27a0ec | 109 | * data tree are chopped off during truncate. We can't do that in |
617ba13b | 110 | * ext4 because whenever we perform intermediate commits during |
ac27a0ec DK |
111 | * truncate, the inode and all the metadata blocks *must* be in a |
112 | * consistent state which allows truncation of the orphans to restart | |
113 | * during recovery. Hence we must fix the get_block-vs-truncate race | |
0e855ac8 | 114 | * by other means, so we have i_data_sem. |
ac27a0ec | 115 | */ |
0e855ac8 | 116 | struct rw_semaphore i_data_sem; |
ac27a0ec | 117 | struct inode vfs_inode; |
678aaf48 | 118 | struct jbd2_inode jinode; |
a86c6181 AT |
119 | |
120 | unsigned long i_ext_generation; | |
121 | struct ext4_ext_cache i_cached_extent; | |
ef7f3835 KS |
122 | /* |
123 | * File creation time. Its function is same as that of | |
124 | * struct timespec i_{a,c,m}time in the generic inode. | |
125 | */ | |
126 | struct timespec i_crtime; | |
c9de560d AT |
127 | |
128 | /* mballoc */ | |
129 | struct list_head i_prealloc_list; | |
130 | spinlock_t i_prealloc_lock; | |
d2a17637 MC |
131 | |
132 | /* allocation reservation info for delalloc */ | |
133 | unsigned long i_reserved_data_blocks; | |
134 | unsigned long i_reserved_meta_blocks; | |
135 | unsigned long i_allocated_meta_blocks; | |
136 | unsigned short i_delalloc_reserved_flag; | |
137 | spinlock_t i_block_reservation_lock; | |
ac27a0ec DK |
138 | }; |
139 | ||
3dcf5451 | 140 | #endif /* _EXT4_I */ |