143 lines
5.1 KiB
C
143 lines
5.1 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 __BTRFS_EXTENT_IO_H__
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#define __BTRFS_EXTENT_IO_H__
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#include "kerncompat.h"
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#include "common/extent-cache.h"
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#include "kernel-lib/list.h"
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struct extent_io_tree;
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#define EXTENT_BUFFER_UPTODATE (1U << 0)
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#define EXTENT_BUFFER_DIRTY (1U << 1)
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#define EXTENT_BUFFER_BAD_TRANSID (1U << 2)
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#define EXTENT_BUFFER_DUMMY (1U << 3)
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#define BLOCK_GROUP_DATA (1U << 1)
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#define BLOCK_GROUP_METADATA (1U << 2)
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#define BLOCK_GROUP_SYSTEM (1U << 4)
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/*
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* The extent buffer bitmap operations are done with byte granularity instead of
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* word granularity for two reasons:
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* 1. The bitmaps must be little-endian on disk.
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* 2. Bitmap items are not guaranteed to be aligned to a word and therefore a
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* single word in a bitmap may straddle two pages in the extent buffer.
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*/
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#define BIT_BYTE(nr) ((nr) / BITS_PER_BYTE)
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#define BYTE_MASK ((1 << BITS_PER_BYTE) - 1)
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#define BITMAP_FIRST_BYTE_MASK(start) \
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((BYTE_MASK << ((start) & (BITS_PER_BYTE - 1))) & BYTE_MASK)
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#define BITMAP_LAST_BYTE_MASK(nbits) \
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(BYTE_MASK >> (-(nbits) & (BITS_PER_BYTE - 1)))
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static inline int le_test_bit(int nr, const u8 *addr)
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{
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return 1U & (addr[BIT_BYTE(nr)] >> (nr & (BITS_PER_BYTE-1)));
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}
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struct btrfs_fs_info;
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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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struct list_head lru;
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struct list_head recow;
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u32 len;
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int refs;
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u32 flags;
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struct btrfs_fs_info *fs_info;
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char data[] __attribute__((aligned(8)));
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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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static inline int set_extent_buffer_uptodate(struct extent_buffer *eb)
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{
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eb->flags |= EXTENT_BUFFER_UPTODATE;
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return 0;
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}
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static inline int clear_extent_buffer_uptodate(struct extent_buffer *eb)
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{
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eb->flags &= ~EXTENT_BUFFER_UPTODATE;
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return 0;
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}
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static inline int extent_buffer_uptodate(struct extent_buffer *eb)
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{
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if (!eb || IS_ERR(eb))
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return 0;
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if (eb->flags & EXTENT_BUFFER_UPTODATE)
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return 1;
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return 0;
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}
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struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
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u64 bytenr);
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struct extent_buffer *find_first_extent_buffer(struct btrfs_fs_info *fs_info,
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u64 start);
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struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
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u64 bytenr, u32 blocksize);
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struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
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struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
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u64 bytenr, u32 blocksize);
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void free_extent_buffer(struct extent_buffer *eb);
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void free_extent_buffer_nocache(struct extent_buffer *eb);
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void free_extent_buffer_stale(struct extent_buffer *eb);
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int memcmp_extent_buffer(const 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(const struct extent_buffer *eb, void *dst,
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unsigned long start, unsigned long len);
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void write_extent_buffer(const 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(const struct extent_buffer *dst,
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const 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 copy_extent_buffer_full(const struct extent_buffer *dst,
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const struct extent_buffer *src);
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void memmove_extent_buffer(const struct extent_buffer *dst,
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const unsigned long dst_offset,
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unsigned long src_offset, unsigned long len);
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void memset_extent_buffer(const struct extent_buffer *eb, char c,
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unsigned long start, unsigned long len);
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int extent_buffer_test_bit(const struct extent_buffer *eb, unsigned long start,
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unsigned long nr);
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int set_extent_buffer_dirty(struct extent_buffer *eb);
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int btrfs_clear_buffer_dirty(struct extent_buffer *eb);
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int read_data_from_disk(struct btrfs_fs_info *info, void *buf, u64 logical,
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u64 *len, int mirror);
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int write_data_to_disk(struct btrfs_fs_info *info, const void *buf, u64 offset,
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u64 bytes);
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void extent_buffer_bitmap_clear(struct extent_buffer *eb, unsigned long start,
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unsigned long pos, unsigned long len);
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void extent_buffer_bitmap_set(struct extent_buffer *eb, unsigned long start,
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unsigned long pos, unsigned long len);
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void extent_buffer_init_cache(struct btrfs_fs_info *fs_info);
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void extent_buffer_free_cache(struct btrfs_fs_info *fs_info);
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void write_extent_buffer_fsid(const struct extent_buffer *eb, const void *srcv);
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void btrfs_readahead_node_child(struct extent_buffer *node, int slot);
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#endif
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