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 #include "kerncompat.h"
  22 #include "extent-cache.h"
  23 #include "list.h"
  24
  25 #define EXTENT_DIRTY 1
  26 #define EXTENT_WRITEBACK (1 << 1)
  27 #define EXTENT_UPTODATE (1 << 2)
  28 #define EXTENT_LOCKED (1 << 3)
  29 #define EXTENT_NEW (1 << 4)
  30 #define EXTENT_DELALLOC (1 << 5)
  31 #define EXTENT_DEFRAG (1 << 6)
  32 #define EXTENT_DEFRAG_DONE (1 << 7)
  33 #define EXTENT_BUFFER_FILLED (1 << 8)
  34 #define EXTENT_CSUM (1 << 9)
  35 #define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
  36
  37 struct extent_io_tree {
  38         struct cache_tree state;
  39         struct cache_tree cache;
  40         struct list_head lru;
  41         u64 cache_size;
  42 };
  43
  44 struct extent_state {
  45         struct cache_extent cache_node;
  46         u64 start;
  47         u64 end;
  48         int refs;
  49         unsigned long state;
  50         u64 private;
  51 };
  52
  53 struct extent_buffer {
  54         struct cache_extent cache_node;
  55         u64 start;
  56         u64 dev_bytenr;
  57         u32 len;
  58         struct extent_io_tree *tree;
  59         struct list_head lru;
  60         int refs;
  61         int flags;
  62         int fd;
  63         char data[];
  64 };
  65
  66 static inline void extent_buffer_get(struct extent_buffer *eb)
  67 {
  68         eb->refs++;
  69 }
  70
  71 void extent_io_tree_init(struct extent_io_tree *tree);
  72 void extent_io_tree_cleanup(struct extent_io_tree *tree);
  73 int set_extent_bits(struct extent_io_tree *tree, u64 start,
  74                     u64 end, int bits, gfp_t mask);
  75 int clear_extent_bits(struct extent_io_tree *tree, u64 start,
  76                       u64 end, int bits, gfp_t mask);
  77 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
  78                           u64 *start_ret, u64 *end_ret, int bits);
  79 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
  80                    int bits, int filled);
  81 int set_extent_dirty(struct extent_io_tree *tree, u64 start,
  82                      u64 end, gfp_t mask);
  83 int clear_extent_dirty(struct extent_io_tree *tree, u64 start,
  84                        u64 end, gfp_t mask);
  85 int extent_buffer_uptodate(struct extent_buffer *eb);
  86 int set_extent_buffer_uptodate(struct extent_buffer *eb);
  87 int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
  88                                 struct extent_buffer *eb);
  89 int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
  90 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
  91 struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
  92                                          u64 bytenr, u32 blocksize);
  93 struct extent_buffer *find_first_extent_buffer(struct extent_io_tree *tree,
  94                                                u64 start);
  95 struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
  96                                           u64 bytenr, u32 blocksize);
  97 void free_extent_buffer(struct extent_buffer *eb);
  98 int read_extent_from_disk(struct extent_buffer *eb);
  99 int write_extent_to_disk(struct extent_buffer *eb);
 100 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
 101                          unsigned long start, unsigned long len);
 102 void read_extent_buffer(struct extent_buffer *eb, void *dst,
 103                         unsigned long start, unsigned long len);
 104 void write_extent_buffer(struct extent_buffer *eb, const void *src,
 105                          unsigned long start, unsigned long len);
 106 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
 107                         unsigned long dst_offset, unsigned long src_offset,
 108                         unsigned long len);
 109 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 110                           unsigned long src_offset, unsigned long len);
 111 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
 112                            unsigned long src_offset, unsigned long len);
 113 void memset_extent_buffer(struct extent_buffer *eb, char c,
 114                           unsigned long start, unsigned long len);
 115 int set_extent_buffer_dirty(struct extent_buffer *eb);
 116 int clear_extent_buffer_dirty(struct extent_buffer *eb);
 117 #endif