mirror of
https://github.com/kdave/btrfs-progs
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116 lines
4.0 KiB
C
116 lines
4.0 KiB
C
/*
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* Copyright (C) 2007 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#ifndef __EXTENTMAP__
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#define __EXTENTMAP__
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#include "kerncompat.h"
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#include "extent-cache.h"
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#include "list.h"
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#define EXTENT_DIRTY 1
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#define EXTENT_WRITEBACK (1 << 1)
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#define EXTENT_UPTODATE (1 << 2)
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#define EXTENT_LOCKED (1 << 3)
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#define EXTENT_NEW (1 << 4)
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#define EXTENT_DELALLOC (1 << 5)
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#define EXTENT_DEFRAG (1 << 6)
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#define EXTENT_DEFRAG_DONE (1 << 7)
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#define EXTENT_BUFFER_FILLED (1 << 8)
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#define EXTENT_CSUM (1 << 9)
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#define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
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struct extent_io_tree {
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struct cache_tree state;
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struct cache_tree cache;
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struct list_head lru;
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u64 cache_size;
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};
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struct extent_state {
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struct cache_extent cache_node;
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u64 start;
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u64 end;
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int refs;
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unsigned long state;
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u64 private;
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};
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struct extent_buffer {
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struct cache_extent cache_node;
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u64 start;
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u64 dev_bytenr;
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u32 len;
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struct extent_io_tree *tree;
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struct list_head lru;
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int refs;
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int flags;
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int fd;
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char data[];
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};
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static inline void extent_buffer_get(struct extent_buffer *eb)
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{
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eb->refs++;
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}
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void extent_io_tree_init(struct extent_io_tree *tree);
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void extent_io_tree_cleanup(struct extent_io_tree *tree);
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int set_extent_bits(struct extent_io_tree *tree, u64 start,
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u64 end, int bits, gfp_t mask);
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int clear_extent_bits(struct extent_io_tree *tree, u64 start,
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u64 end, int bits, gfp_t mask);
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int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
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u64 *start_ret, u64 *end_ret, int bits);
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int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
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int bits, int filled);
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int set_extent_dirty(struct extent_io_tree *tree, u64 start,
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u64 end, gfp_t mask);
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int clear_extent_dirty(struct extent_io_tree *tree, u64 start,
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u64 end, gfp_t mask);
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int extent_buffer_uptodate(struct extent_buffer *eb);
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int set_extent_buffer_uptodate(struct extent_buffer *eb);
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int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
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int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
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struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
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u64 bytenr, u32 blocksize);
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struct extent_buffer *find_first_extent_buffer(struct extent_io_tree *tree,
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u64 start);
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struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
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u64 bytenr, u32 blocksize);
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void free_extent_buffer(struct extent_buffer *eb);
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int read_extent_from_disk(struct extent_buffer *eb);
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int write_extent_to_disk(struct extent_buffer *eb);
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int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
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unsigned long start, unsigned long len);
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void read_extent_buffer(struct extent_buffer *eb, void *dst,
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unsigned long start, unsigned long len);
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void write_extent_buffer(struct extent_buffer *eb, const void *src,
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unsigned long start, unsigned long len);
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void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
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unsigned long dst_offset, unsigned long src_offset,
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unsigned long len);
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void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
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unsigned long src_offset, unsigned long len);
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void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
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unsigned long src_offset, unsigned long len);
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void memset_extent_buffer(struct extent_buffer *eb, char c,
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unsigned long start, unsigned long len);
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int set_extent_buffer_dirty(struct extent_buffer *eb);
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int clear_extent_buffer_dirty(struct extent_buffer *eb);
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#endif
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