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.
19 #ifndef __BTRFS_EXTENT_IO_H__
20 #define __BTRFS_EXTENT_IO_H__
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 static inline int set_extent_buffer_uptodate(struct extent_buffer
*eb
)
105 eb
->flags
|= EXTENT_UPTODATE
;
109 static inline int clear_extent_buffer_uptodate(struct extent_io_tree
*tree
,
110 struct extent_buffer
*eb
)
112 eb
->flags
&= ~EXTENT_UPTODATE
;
116 static inline int extent_buffer_uptodate(struct extent_buffer
*eb
)
118 if (!eb
|| IS_ERR(eb
))
120 if (eb
->flags
& EXTENT_UPTODATE
)
125 int set_state_private(struct extent_io_tree
*tree
, u64 start
, u64 xprivate
);
126 int get_state_private(struct extent_io_tree
*tree
, u64 start
, u64
*xprivate
);
127 struct extent_buffer
*find_extent_buffer(struct extent_io_tree
*tree
,
128 u64 bytenr
, u32 blocksize
);
129 struct extent_buffer
*find_first_extent_buffer(struct extent_io_tree
*tree
,
131 struct extent_buffer
*alloc_extent_buffer(struct extent_io_tree
*tree
,
132 u64 bytenr
, u32 blocksize
);
133 struct extent_buffer
*btrfs_clone_extent_buffer(struct extent_buffer
*src
);
134 void free_extent_buffer(struct extent_buffer
*eb
);
135 int read_extent_from_disk(struct extent_buffer
*eb
,
136 unsigned long offset
, unsigned long len
);
137 int write_extent_to_disk(struct extent_buffer
*eb
);
138 int memcmp_extent_buffer(struct extent_buffer
*eb
, const void *ptrv
,
139 unsigned long start
, unsigned long len
);
140 void read_extent_buffer(struct extent_buffer
*eb
, void *dst
,
141 unsigned long start
, unsigned long len
);
142 void write_extent_buffer(struct extent_buffer
*eb
, const void *src
,
143 unsigned long start
, unsigned long len
);
144 void copy_extent_buffer(struct extent_buffer
*dst
, struct extent_buffer
*src
,
145 unsigned long dst_offset
, unsigned long src_offset
,
147 void memmove_extent_buffer(struct extent_buffer
*dst
, unsigned long dst_offset
,
148 unsigned long src_offset
, unsigned long len
);
149 void memset_extent_buffer(struct extent_buffer
*eb
, char c
,
150 unsigned long start
, unsigned long len
);
151 int extent_buffer_test_bit(struct extent_buffer
*eb
, unsigned long start
,
153 int set_extent_buffer_dirty(struct extent_buffer
*eb
);
154 int clear_extent_buffer_dirty(struct extent_buffer
*eb
);
155 int read_data_from_disk(struct btrfs_fs_info
*info
, void *buf
, u64 offset
,
156 u64 bytes
, int mirror
);
157 int write_data_to_disk(struct btrfs_fs_info
*info
, void *buf
, u64 offset
,
158 u64 bytes
, int mirror
);