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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_ORDERED_DATA__ |
20 | #define __BTRFS_ORDERED_DATA__ |
21 | |
22 | /* one of these per inode */ |
23 | struct btrfs_ordered_inode_tree { |
24 | spinlock_t lock; |
25 | struct rb_root tree; |
26 | struct rb_node *last; |
27 | }; |
28 | |
29 | /* |
30 | * these are used to collect checksums done just before bios submission. |
31 | * They are attached via a list into the ordered extent, and |
32 | * checksum items are inserted into the tree after all the blocks in |
33 | * the ordered extent are on disk |
34 | */ |
35 | struct btrfs_sector_sum { |
36 | /* bytenr on disk */ |
37 | u64 bytenr; |
38 | u32 sum; |
39 | }; |
40 | |
41 | struct btrfs_ordered_sum { |
42 | /* bytenr is the start of this extent on disk */ |
43 | u64 bytenr; |
44 | |
45 | /* |
46 | * this is the length in bytes covered by the sums array below. |
47 | */ |
48 | unsigned long len; |
49 | struct list_head list; |
50 | /* last field is a variable length array of btrfs_sector_sums */ |
51 | struct btrfs_sector_sum sums[]; |
52 | }; |
53 | |
54 | /* |
55 | * bits for the flags field: |
56 | * |
57 | * BTRFS_ORDERED_IO_DONE is set when all of the blocks are written. |
58 | * It is used to make sure metadata is inserted into the tree only once |
59 | * per extent. |
60 | * |
61 | * BTRFS_ORDERED_COMPLETE is set when the extent is removed from the |
62 | * rbtree, just before waking any waiters. It is used to indicate the |
63 | * IO is done and any metadata is inserted into the tree. |
64 | */ |
65 | #define BTRFS_ORDERED_IO_DONE 0 /* set when all the pages are written */ |
66 | |
67 | #define BTRFS_ORDERED_COMPLETE 1 /* set when removed from the tree */ |
68 | |
69 | #define BTRFS_ORDERED_NOCOW 2 /* set when we want to write in place */ |
70 | |
71 | #define BTRFS_ORDERED_COMPRESSED 3 /* writing a compressed extent */ |
72 | |
73 | #define BTRFS_ORDERED_PREALLOC 4 /* set when writing to prealloced extent */ |
74 | |
75 | struct btrfs_ordered_extent { |
76 | /* logical offset in the file */ |
77 | u64 file_offset; |
78 | |
79 | /* disk byte number */ |
80 | u64 start; |
81 | |
82 | /* ram length of the extent in bytes */ |
83 | u64 len; |
84 | |
85 | /* extent length on disk */ |
86 | u64 disk_len; |
87 | |
88 | /* number of bytes that still need writing */ |
89 | u64 bytes_left; |
90 | |
91 | /* flags (described above) */ |
92 | unsigned long flags; |
93 | |
94 | /* reference count */ |
95 | atomic_t refs; |
96 | |
97 | /* the inode we belong to */ |
98 | struct inode *inode; |
99 | |
100 | /* list of checksums for insertion when the extent io is done */ |
101 | struct list_head list; |
102 | |
103 | /* used to wait for the BTRFS_ORDERED_COMPLETE bit */ |
104 | wait_queue_head_t wait; |
105 | |
106 | /* our friendly rbtree entry */ |
107 | struct rb_node rb_node; |
108 | |
109 | /* a per root list of all the pending ordered extents */ |
110 | struct list_head root_extent_list; |
111 | }; |
112 | |
113 | |
114 | /* |
115 | * calculates the total size you need to allocate for an ordered sum |
116 | * structure spanning 'bytes' in the file |
117 | */ |
118 | static inline int btrfs_ordered_sum_size(struct btrfs_root *root, |
119 | unsigned long bytes) |
120 | { |
121 | unsigned long num_sectors = (bytes + root->sectorsize - 1) / |
122 | root->sectorsize; |
123 | num_sectors++; |
124 | return sizeof(struct btrfs_ordered_sum) + |
125 | num_sectors * sizeof(struct btrfs_sector_sum); |
126 | } |
127 | |
128 | static inline void |
129 | btrfs_ordered_inode_tree_init(struct btrfs_ordered_inode_tree *t) |
130 | { |
131 | spin_lock_init(&t->lock); |
132 | t->tree = RB_ROOT; |
133 | t->last = NULL; |
134 | } |
135 | |
136 | int btrfs_put_ordered_extent(struct btrfs_ordered_extent *entry); |
137 | int btrfs_remove_ordered_extent(struct inode *inode, |
138 | struct btrfs_ordered_extent *entry); |
139 | int btrfs_dec_test_ordered_pending(struct inode *inode, |
140 | struct btrfs_ordered_extent **cached, |
141 | u64 file_offset, u64 io_size); |
142 | int btrfs_add_ordered_extent(struct inode *inode, u64 file_offset, |
143 | u64 start, u64 len, u64 disk_len, int tyep); |
144 | int btrfs_add_ordered_sum(struct inode *inode, |
145 | struct btrfs_ordered_extent *entry, |
146 | struct btrfs_ordered_sum *sum); |
147 | struct btrfs_ordered_extent *btrfs_lookup_ordered_extent(struct inode *inode, |
148 | u64 file_offset); |
149 | void btrfs_start_ordered_extent(struct inode *inode, |
150 | struct btrfs_ordered_extent *entry, int wait); |
151 | int btrfs_wait_ordered_range(struct inode *inode, u64 start, u64 len); |
152 | struct btrfs_ordered_extent * |
153 | btrfs_lookup_first_ordered_extent(struct inode * inode, u64 file_offset); |
154 | int btrfs_ordered_update_i_size(struct inode *inode, u64 offset, |
155 | struct btrfs_ordered_extent *ordered); |
156 | int btrfs_find_ordered_sum(struct inode *inode, u64 offset, u64 disk_bytenr, u32 *sum); |
157 | int btrfs_run_ordered_operations(struct btrfs_root *root, int wait); |
158 | int btrfs_add_ordered_operation(struct btrfs_trans_handle *trans, |
159 | struct btrfs_root *root, |
160 | struct inode *inode); |
161 | int btrfs_wait_ordered_extents(struct btrfs_root *root, |
162 | int nocow_only, int delay_iput); |
163 | #endif |
164 |
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od-2011-09-04
od-2011-09-18
v2.6.34-rc5
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