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1 | /* |
2 | * Copyright (C) 2007 Oracle. All rights reserved. |
3 | * |
4 | * This program is free software; you can redistribute it and/or |
5 | * modify it under the terms of the GNU General Public |
6 | * License v2 as published by the Free Software Foundation. |
7 | * |
8 | * This program is distributed in the hope that it will be useful, |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
11 | * General Public License for more details. |
12 | * |
13 | * You should have received a copy of the GNU General Public |
14 | * License along with this program; if not, write to the |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
16 | * Boston, MA 021110-1307, USA. |
17 | */ |
18 | |
19 | #ifndef __BTRFS_I__ |
20 | #define __BTRFS_I__ |
21 | |
22 | #include "extent_map.h" |
23 | #include "extent_io.h" |
24 | #include "ordered-data.h" |
25 | |
26 | /* in memory btrfs inode */ |
27 | struct btrfs_inode { |
28 | /* which subvolume this inode belongs to */ |
29 | struct btrfs_root *root; |
30 | |
31 | /* key used to find this inode on disk. This is used by the code |
32 | * to read in roots of subvolumes |
33 | */ |
34 | struct btrfs_key location; |
35 | |
36 | /* the extent_tree has caches of all the extent mappings to disk */ |
37 | struct extent_map_tree extent_tree; |
38 | |
39 | /* the io_tree does range state (DIRTY, LOCKED etc) */ |
40 | struct extent_io_tree io_tree; |
41 | |
42 | /* special utility tree used to record which mirrors have already been |
43 | * tried when checksums fail for a given block |
44 | */ |
45 | struct extent_io_tree io_failure_tree; |
46 | |
47 | /* held while inesrting or deleting extents from files */ |
48 | struct mutex extent_mutex; |
49 | |
50 | /* held while logging the inode in tree-log.c */ |
51 | struct mutex log_mutex; |
52 | |
53 | /* used to order data wrt metadata */ |
54 | struct btrfs_ordered_inode_tree ordered_tree; |
55 | |
56 | /* for keeping track of orphaned inodes */ |
57 | struct list_head i_orphan; |
58 | |
59 | /* list of all the delalloc inodes in the FS. There are times we need |
60 | * to write all the delalloc pages to disk, and this list is used |
61 | * to walk them all. |
62 | */ |
63 | struct list_head delalloc_inodes; |
64 | |
65 | /* |
66 | * list for tracking inodes that must be sent to disk before a |
67 | * rename or truncate commit |
68 | */ |
69 | struct list_head ordered_operations; |
70 | |
71 | /* node for the red-black tree that links inodes in subvolume root */ |
72 | struct rb_node rb_node; |
73 | |
74 | /* the space_info for where this inode's data allocations are done */ |
75 | struct btrfs_space_info *space_info; |
76 | |
77 | /* full 64 bit generation number, struct vfs_inode doesn't have a big |
78 | * enough field for this. |
79 | */ |
80 | u64 generation; |
81 | |
82 | /* sequence number for NFS changes */ |
83 | u64 sequence; |
84 | |
85 | /* |
86 | * transid of the trans_handle that last modified this inode |
87 | */ |
88 | u64 last_trans; |
89 | /* |
90 | * transid that last logged this inode |
91 | */ |
92 | u64 logged_trans; |
93 | |
94 | /* total number of bytes pending delalloc, used by stat to calc the |
95 | * real block usage of the file |
96 | */ |
97 | u64 delalloc_bytes; |
98 | |
99 | /* total number of bytes that may be used for this inode for |
100 | * delalloc |
101 | */ |
102 | u64 reserved_bytes; |
103 | |
104 | /* |
105 | * the size of the file stored in the metadata on disk. data=ordered |
106 | * means the in-memory i_size might be larger than the size on disk |
107 | * because not all the blocks are written yet. |
108 | */ |
109 | u64 disk_i_size; |
110 | |
111 | /* flags field from the on disk inode */ |
112 | u32 flags; |
113 | |
114 | /* |
115 | * if this is a directory then index_cnt is the counter for the index |
116 | * number for new files that are created |
117 | */ |
118 | u64 index_cnt; |
119 | |
120 | /* the start of block group preferred for allocations. */ |
121 | u64 block_group; |
122 | |
123 | /* the fsync log has some corner cases that mean we have to check |
124 | * directories to see if any unlinks have been done before |
125 | * the directory was logged. See tree-log.c for all the |
126 | * details |
127 | */ |
128 | u64 last_unlink_trans; |
129 | |
130 | /* |
131 | * ordered_data_close is set by truncate when a file that used |
132 | * to have good data has been truncated to zero. When it is set |
133 | * the btrfs file release call will add this inode to the |
134 | * ordered operations list so that we make sure to flush out any |
135 | * new data the application may have written before commit. |
136 | * |
137 | * yes, its silly to have a single bitflag, but we might grow more |
138 | * of these. |
139 | */ |
140 | unsigned ordered_data_close:1; |
141 | |
142 | struct inode vfs_inode; |
143 | }; |
144 | |
145 | static inline struct btrfs_inode *BTRFS_I(struct inode *inode) |
146 | { |
147 | return container_of(inode, struct btrfs_inode, vfs_inode); |
148 | } |
149 | |
150 | static inline void btrfs_i_size_write(struct inode *inode, u64 size) |
151 | { |
152 | inode->i_size = size; |
153 | BTRFS_I(inode)->disk_i_size = size; |
154 | } |
155 | |
156 | #endif |
157 |
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