aboutsummaryrefslogtreecommitdiffstats
path: root/fs/btrfs/ordered-data.h
diff options
context:
space:
mode:
Diffstat (limited to 'fs/btrfs/ordered-data.h')
-rw-r--r--fs/btrfs/ordered-data.h149
1 files changed, 149 insertions, 0 deletions
diff --git a/fs/btrfs/ordered-data.h b/fs/btrfs/ordered-data.h
new file mode 100644
index 000000000000..f50f8870a144
--- /dev/null
+++ b/fs/btrfs/ordered-data.h
@@ -0,0 +1,149 @@
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 */
23struct btrfs_ordered_inode_tree {
24 struct mutex mutex;
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 */
35struct btrfs_sector_sum {
36 u64 offset;
37 u32 sum;
38};
39
40struct btrfs_ordered_sum {
41 u64 file_offset;
42 /*
43 * this is the length in bytes covered by the sums array below.
44 * But, the sums array may not be contiguous in the file.
45 */
46 unsigned long len;
47 struct list_head list;
48 /* last field is a variable length array of btrfs_sector_sums */
49 struct btrfs_sector_sum sums[];
50};
51
52/*
53 * bits for the flags field:
54 *
55 * BTRFS_ORDERED_IO_DONE is set when all of the blocks are written.
56 * It is used to make sure metadata is inserted into the tree only once
57 * per extent.
58 *
59 * BTRFS_ORDERED_COMPLETE is set when the extent is removed from the
60 * rbtree, just before waking any waiters. It is used to indicate the
61 * IO is done and any metadata is inserted into the tree.
62 */
63#define BTRFS_ORDERED_IO_DONE 0 /* set when all the pages are written */
64
65#define BTRFS_ORDERED_COMPLETE 1 /* set when removed from the tree */
66
67#define BTRFS_ORDERED_NOCOW 2 /* set when we want to write in place */
68
69struct btrfs_ordered_extent {
70 /* logical offset in the file */
71 u64 file_offset;
72
73 /* disk byte number */
74 u64 start;
75
76 /* length of the extent in bytes */
77 u64 len;
78
79 /* flags (described above) */
80 unsigned long flags;
81
82 /* reference count */
83 atomic_t refs;
84
85 /* the inode we belong to */
86 struct inode *inode;
87
88 /* list of checksums for insertion when the extent io is done */
89 struct list_head list;
90
91 /* used to wait for the BTRFS_ORDERED_COMPLETE bit */
92 wait_queue_head_t wait;
93
94 /* our friendly rbtree entry */
95 struct rb_node rb_node;
96
97 /* a per root list of all the pending ordered extents */
98 struct list_head root_extent_list;
99};
100
101
102/*
103 * calculates the total size you need to allocate for an ordered sum
104 * structure spanning 'bytes' in the file
105 */
106static inline int btrfs_ordered_sum_size(struct btrfs_root *root,
107 unsigned long bytes)
108{
109 unsigned long num_sectors = (bytes + root->sectorsize - 1) /
110 root->sectorsize;
111 num_sectors++;
112 return sizeof(struct btrfs_ordered_sum) +
113 num_sectors * sizeof(struct btrfs_sector_sum);
114}
115
116static inline void
117btrfs_ordered_inode_tree_init(struct btrfs_ordered_inode_tree *t)
118{
119 mutex_init(&t->mutex);
120 t->tree.rb_node = NULL;
121 t->last = NULL;
122}
123
124int btrfs_put_ordered_extent(struct btrfs_ordered_extent *entry);
125int btrfs_remove_ordered_extent(struct inode *inode,
126 struct btrfs_ordered_extent *entry);
127int btrfs_dec_test_ordered_pending(struct inode *inode,
128 u64 file_offset, u64 io_size);
129int btrfs_add_ordered_extent(struct inode *inode, u64 file_offset,
130 u64 start, u64 len, int nocow);
131int btrfs_add_ordered_sum(struct inode *inode,
132 struct btrfs_ordered_extent *entry,
133 struct btrfs_ordered_sum *sum);
134struct btrfs_ordered_extent *btrfs_lookup_ordered_extent(struct inode *inode,
135 u64 file_offset);
136void btrfs_start_ordered_extent(struct inode *inode,
137 struct btrfs_ordered_extent *entry, int wait);
138int btrfs_wait_ordered_range(struct inode *inode, u64 start, u64 len);
139struct btrfs_ordered_extent *
140btrfs_lookup_first_ordered_extent(struct inode * inode, u64 file_offset);
141int btrfs_ordered_update_i_size(struct inode *inode,
142 struct btrfs_ordered_extent *ordered);
143int btrfs_find_ordered_sum(struct inode *inode, u64 offset, u32 *sum);
144int btrfs_wait_on_page_writeback_range(struct address_space *mapping,
145 pgoff_t start, pgoff_t end);
146int btrfs_fdatawrite_range(struct address_space *mapping, loff_t start,
147 loff_t end, int sync_mode);
148int btrfs_wait_ordered_extents(struct btrfs_root *root, int nocow_only);
149#endif
generated by cgit v1.2.2 (git 2.25.0) at 2025-01-01 09:22:35 -0500