2 * Copyright (C) 2007 Oracle. All rights reserved.
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.
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.
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.
22 #if BTRFS_FLAT_INCLUDES
23 #include "kerncompat.h"
24 #include "extent-cache.h"
27 #include <btrfs/kerncompat.h>
28 #include <btrfs/extent-cache.h>
29 #include <btrfs/list.h>
30 #endif /* BTRFS_FLAT_INCLUDES */
32 #define EXTENT_DIRTY 1
33 #define EXTENT_WRITEBACK (1 << 1)
34 #define EXTENT_UPTODATE (1 << 2)
35 #define EXTENT_LOCKED (1 << 3)
36 #define EXTENT_NEW (1 << 4)
37 #define EXTENT_DELALLOC (1 << 5)
38 #define EXTENT_DEFRAG (1 << 6)
39 #define EXTENT_DEFRAG_DONE (1 << 7)
40 #define EXTENT_BUFFER_FILLED (1 << 8)
41 #define EXTENT_CSUM (1 << 9)
42 #define EXTENT_BAD_TRANSID (1 << 10)
43 #define EXTENT_BUFFER_DUMMY (1 << 11)
44 #define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
46 #define BLOCK_GROUP_DATA EXTENT_WRITEBACK
47 #define BLOCK_GROUP_METADATA EXTENT_UPTODATE
48 #define BLOCK_GROUP_SYSTEM EXTENT_NEW
50 #define BLOCK_GROUP_DIRTY EXTENT_DIRTY
54 struct extent_io_tree {
55 struct cache_tree state;
56 struct cache_tree cache;
62 struct cache_extent cache_node;
70 struct extent_buffer {
71 struct cache_extent cache_node;
75 struct extent_io_tree *tree;
77 struct list_head recow;
84 static inline void extent_buffer_get(struct extent_buffer *eb)
89 void extent_io_tree_init(struct extent_io_tree *tree);
90 void extent_io_tree_cleanup(struct extent_io_tree *tree);
91 int set_extent_bits(struct extent_io_tree *tree, u64 start,
92 u64 end, int bits, gfp_t mask);
93 int clear_extent_bits(struct extent_io_tree *tree, u64 start,
94 u64 end, int bits, gfp_t mask);
95 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
96 u64 *start_ret, u64 *end_ret, int bits);
97 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
98 int bits, int filled);
99 int set_extent_dirty(struct extent_io_tree *tree, u64 start,
100 u64 end, gfp_t mask);
101 int clear_extent_dirty(struct extent_io_tree *tree, u64 start,
102 u64 end, gfp_t mask);
103 int extent_buffer_uptodate(struct extent_buffer *eb);
104 int set_extent_buffer_uptodate(struct extent_buffer *eb);
105 int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
106 struct extent_buffer *eb);
107 int set_state_private(struct extent_io_tree *tree, u64 start, u64 xprivate);
108 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *xprivate);
109 struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
110 u64 bytenr, u32 blocksize);
111 struct extent_buffer *find_first_extent_buffer(struct extent_io_tree *tree,
113 struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
114 u64 bytenr, u32 blocksize);
115 struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
116 void free_extent_buffer(struct extent_buffer *eb);
117 int read_extent_from_disk(struct extent_buffer *eb,
118 unsigned long offset, unsigned long len);
119 int write_extent_to_disk(struct extent_buffer *eb);
120 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
121 unsigned long start, unsigned long len);
122 void read_extent_buffer(struct extent_buffer *eb, void *dst,
123 unsigned long start, unsigned long len);
124 void write_extent_buffer(struct extent_buffer *eb, const void *src,
125 unsigned long start, unsigned long len);
126 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
127 unsigned long dst_offset, unsigned long src_offset,
129 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
130 unsigned long src_offset, unsigned long len);
131 void memset_extent_buffer(struct extent_buffer *eb, char c,
132 unsigned long start, unsigned long len);
133 int set_extent_buffer_dirty(struct extent_buffer *eb);
134 int clear_extent_buffer_dirty(struct extent_buffer *eb);
135 int read_data_from_disk(struct btrfs_fs_info *info, void *buf, u64 offset,
136 u64 bytes, int mirror);
137 int write_data_to_disk(struct btrfs_fs_info *info, void *buf, u64 offset,
138 u64 bytes, int mirror);