extent_io.h

   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 __EXTENTMAP__
  20 #define __EXTENTMAP__
  21
  22 #if BTRFS_FLAT_INCLUDES
  23 #include "kerncompat.h"
  24 #include "extent-cache.h"
  25 #include "list.h"
  26 #else
  27 #include <btrfs/kerncompat.h>
  28 #include <btrfs/extent-cache.h>
  29 #include <btrfs/list.h>
  30 #endif /* BTRFS_FLAT_INCLUDES */
  31
  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_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
  44
  45 #define BLOCK_GROUP_DATA     EXTENT_WRITEBACK
  46 #define BLOCK_GROUP_METADATA EXTENT_UPTODATE
  47 #define BLOCK_GROUP_SYSTEM   EXTENT_NEW
  48
  49 #define BLOCK_GROUP_DIRTY EXTENT_DIRTY
  50
  51 struct btrfs_fs_info;
  52
  53 struct extent_io_tree {
  54         struct cache_tree state;
  55         struct cache_tree cache;
  56         struct list_head lru;
  57         u64 cache_size;
  58 };
  59
  60 struct extent_state {
  61         struct cache_extent cache_node;
  62         u64 start;
  63         u64 end;
  64         int refs;
  65         unsigned long state;
  66         u64 xprivate;
  67 };
  68
  69 struct extent_buffer {
  70         struct cache_extent cache_node;
  71         u64 start;
  72         u64 dev_bytenr;
  73         u32 len;
  74         struct extent_io_tree *tree;
  75         struct list_head lru;
  76         struct list_head recow;
  77         int refs;
  78         int flags;
  79         int fd;
  80         char data[];
  81 };
  82
  83 static inline void extent_buffer_get(struct extent_buffer *eb)
  84 {
  85         eb->refs++;
  86 }
  87
  88 void extent_io_tree_init(struct extent_io_tree *tree);
  89 void extent_io_tree_cleanup(struct extent_io_tree *tree);
  90 int set_extent_bits(struct extent_io_tree *tree, u64 start,
  91                     u64 end, int bits, gfp_t mask);
  92 int clear_extent_bits(struct extent_io_tree *tree, u64 start,
  93                       u64 end, int bits, gfp_t mask);
  94 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
  95                           u64 *start_ret, u64 *end_ret, int bits);
  96 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
  97                    int bits, int filled);
  98 int set_extent_dirty(struct extent_io_tree *tree, u64 start,
  99                      u64 end, gfp_t mask);
 100 int clear_extent_dirty(struct extent_io_tree *tree, u64 start,
 101                        u64 end, gfp_t mask);
 102 int extent_buffer_uptodate(struct extent_buffer *eb);
 103 int set_extent_buffer_uptodate(struct extent_buffer *eb);
 104 int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
 105                                 struct extent_buffer *eb);
 106 int set_state_private(struct extent_io_tree *tree, u64 start, u64 xprivate);
 107 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *xprivate);
 108 struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
 109                                          u64 bytenr, u32 blocksize);
 110 struct extent_buffer *find_first_extent_buffer(struct extent_io_tree *tree,
 111                                                u64 start);
 112 struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
 113                                           u64 bytenr, u32 blocksize);
 114 void free_extent_buffer(struct extent_buffer *eb);
 115 int read_extent_from_disk(struct extent_buffer *eb,
 116                           unsigned long offset, unsigned long len);
 117 int write_extent_to_disk(struct extent_buffer *eb);
 118 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
 119                          unsigned long start, unsigned long len);
 120 void read_extent_buffer(struct extent_buffer *eb, void *dst,
 121                         unsigned long start, unsigned long len);
 122 void write_extent_buffer(struct extent_buffer *eb, const void *src,
 123                          unsigned long start, unsigned long len);
 124 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
 125                         unsigned long dst_offset, unsigned long src_offset,
 126                         unsigned long len);
 127 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 128                            unsigned long src_offset, unsigned long len);
 129 void memset_extent_buffer(struct extent_buffer *eb, char c,
 130                           unsigned long start, unsigned long len);
 131 int set_extent_buffer_dirty(struct extent_buffer *eb);
 132 int clear_extent_buffer_dirty(struct extent_buffer *eb);
 133 int read_data_from_disk(struct btrfs_fs_info *info, void *buf, u64 offset,
 134                         u64 bytes, int mirror);
 135 int write_data_to_disk(struct btrfs_fs_info *info, void *buf, u64 offset,
 136                        u64 bytes, int mirror);
 137 #endif