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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 | #include "delayed-inode.h" |
26 | |
27 | /* in memory btrfs inode */ |
28 | struct btrfs_inode { |
29 | /* which subvolume this inode belongs to */ |
30 | struct btrfs_root *root; |
31 | |
32 | /* key used to find this inode on disk. This is used by the code |
33 | * to read in roots of subvolumes |
34 | */ |
35 | struct btrfs_key location; |
36 | |
37 | /* the extent_tree has caches of all the extent mappings to disk */ |
38 | struct extent_map_tree extent_tree; |
39 | |
40 | /* the io_tree does range state (DIRTY, LOCKED etc) */ |
41 | struct extent_io_tree io_tree; |
42 | |
43 | /* special utility tree used to record which mirrors have already been |
44 | * tried when checksums fail for a given block |
45 | */ |
46 | struct extent_io_tree io_failure_tree; |
47 | |
48 | /* held while logging the inode in tree-log.c */ |
49 | struct mutex log_mutex; |
50 | |
51 | /* used to order data wrt metadata */ |
52 | struct btrfs_ordered_inode_tree ordered_tree; |
53 | |
54 | /* for keeping track of orphaned inodes */ |
55 | struct list_head i_orphan; |
56 | |
57 | /* list of all the delalloc inodes in the FS. There are times we need |
58 | * to write all the delalloc pages to disk, and this list is used |
59 | * to walk them all. |
60 | */ |
61 | struct list_head delalloc_inodes; |
62 | |
63 | /* |
64 | * list for tracking inodes that must be sent to disk before a |
65 | * rename or truncate commit |
66 | */ |
67 | struct list_head ordered_operations; |
68 | |
69 | /* node for the red-black tree that links inodes in subvolume root */ |
70 | struct rb_node rb_node; |
71 | |
72 | /* the space_info for where this inode's data allocations are done */ |
73 | struct btrfs_space_info *space_info; |
74 | |
75 | /* full 64 bit generation number, struct vfs_inode doesn't have a big |
76 | * enough field for this. |
77 | */ |
78 | u64 generation; |
79 | |
80 | /* sequence number for NFS changes */ |
81 | u64 sequence; |
82 | |
83 | /* |
84 | * transid of the trans_handle that last modified this inode |
85 | */ |
86 | u64 last_trans; |
87 | |
88 | /* |
89 | * log transid when this inode was last modified |
90 | */ |
91 | u64 last_sub_trans; |
92 | |
93 | /* |
94 | * transid that last logged this inode |
95 | */ |
96 | u64 logged_trans; |
97 | |
98 | /* total number of bytes pending delalloc, used by stat to calc the |
99 | * real block usage of the file |
100 | */ |
101 | u64 delalloc_bytes; |
102 | |
103 | /* total number of bytes that may be used for this inode for |
104 | * delalloc |
105 | */ |
106 | u64 reserved_bytes; |
107 | |
108 | /* |
109 | * the size of the file stored in the metadata on disk. data=ordered |
110 | * means the in-memory i_size might be larger than the size on disk |
111 | * because not all the blocks are written yet. |
112 | */ |
113 | u64 disk_i_size; |
114 | |
115 | /* flags field from the on disk inode */ |
116 | u32 flags; |
117 | |
118 | /* |
119 | * if this is a directory then index_cnt is the counter for the index |
120 | * number for new files that are created |
121 | */ |
122 | u64 index_cnt; |
123 | |
124 | /* the fsync log has some corner cases that mean we have to check |
125 | * directories to see if any unlinks have been done before |
126 | * the directory was logged. See tree-log.c for all the |
127 | * details |
128 | */ |
129 | u64 last_unlink_trans; |
130 | |
131 | /* |
132 | * Counters to keep track of the number of extent item's we may use due |
133 | * to delalloc and such. outstanding_extents is the number of extent |
134 | * items we think we'll end up using, and reserved_extents is the number |
135 | * of extent items we've reserved metadata for. |
136 | */ |
137 | atomic_t outstanding_extents; |
138 | atomic_t reserved_extents; |
139 | |
140 | /* |
141 | * ordered_data_close is set by truncate when a file that used |
142 | * to have good data has been truncated to zero. When it is set |
143 | * the btrfs file release call will add this inode to the |
144 | * ordered operations list so that we make sure to flush out any |
145 | * new data the application may have written before commit. |
146 | * |
147 | * yes, its silly to have a single bitflag, but we might grow more |
148 | * of these. |
149 | */ |
150 | unsigned ordered_data_close:1; |
151 | unsigned orphan_meta_reserved:1; |
152 | unsigned dummy_inode:1; |
153 | unsigned in_defrag:1; |
154 | |
155 | /* |
156 | * always compress this one file |
157 | */ |
158 | unsigned force_compress:4; |
159 | |
160 | struct btrfs_delayed_node *delayed_node; |
161 | |
162 | struct inode vfs_inode; |
163 | }; |
164 | |
165 | extern unsigned char btrfs_filetype_table[]; |
166 | |
167 | static inline struct btrfs_inode *BTRFS_I(struct inode *inode) |
168 | { |
169 | return container_of(inode, struct btrfs_inode, vfs_inode); |
170 | } |
171 | |
172 | static inline u64 btrfs_ino(struct inode *inode) |
173 | { |
174 | u64 ino = BTRFS_I(inode)->location.objectid; |
175 | |
176 | if (ino <= BTRFS_FIRST_FREE_OBJECTID) |
177 | ino = inode->i_ino; |
178 | return ino; |
179 | } |
180 | |
181 | static inline void btrfs_i_size_write(struct inode *inode, u64 size) |
182 | { |
183 | i_size_write(inode, size); |
184 | BTRFS_I(inode)->disk_i_size = size; |
185 | } |
186 | |
187 | #endif |
188 |
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