diff options
Diffstat (limited to 'extent_io.h')
| -rw-r--r-- | extent_io.h | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/extent_io.h b/extent_io.h new file mode 100644 index 00000000..a9a73535 --- /dev/null +++ b/extent_io.h @@ -0,0 +1,159 @@ +/* + * Copyright (C) 2007 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License v2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#ifndef __BTRFS_EXTENT_IO_H__ +#define __BTRFS_EXTENT_IO_H__ + +#if BTRFS_FLAT_INCLUDES +#include "kerncompat.h" +#include "extent-cache.h" +#include "list.h" +#else +#include <btrfs/kerncompat.h> +#include <btrfs/extent-cache.h> +#include <btrfs/list.h> +#endif /* BTRFS_FLAT_INCLUDES */ + +#define EXTENT_DIRTY 1 +#define EXTENT_WRITEBACK (1 << 1) +#define EXTENT_UPTODATE (1 << 2) +#define EXTENT_LOCKED (1 << 3) +#define EXTENT_NEW (1 << 4) +#define EXTENT_DELALLOC (1 << 5) +#define EXTENT_DEFRAG (1 << 6) +#define EXTENT_DEFRAG_DONE (1 << 7) +#define EXTENT_BUFFER_FILLED (1 << 8) +#define EXTENT_CSUM (1 << 9) +#define EXTENT_BAD_TRANSID (1 << 10) +#define EXTENT_BUFFER_DUMMY (1 << 11) +#define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK) + +#define BLOCK_GROUP_DATA EXTENT_WRITEBACK +#define BLOCK_GROUP_METADATA EXTENT_UPTODATE +#define BLOCK_GROUP_SYSTEM EXTENT_NEW + +#define BLOCK_GROUP_DIRTY EXTENT_DIRTY + +struct btrfs_fs_info; + +struct extent_io_tree { + struct cache_tree state; + struct cache_tree cache; + struct list_head lru; + u64 cache_size; +}; + +struct extent_state { + struct cache_extent cache_node; + u64 start; + u64 end; + int refs; + unsigned long state; + u64 xprivate; +}; + +struct extent_buffer { + struct cache_extent cache_node; + u64 start; + u64 dev_bytenr; + u32 len; + struct extent_io_tree *tree; + struct list_head lru; + struct list_head recow; + int refs; + int flags; + int fd; + char data[]; +}; + +static inline void extent_buffer_get(struct extent_buffer *eb) +{ + eb->refs++; +} + +void extent_io_tree_init(struct extent_io_tree *tree); +void extent_io_tree_cleanup(struct extent_io_tree *tree); +int set_extent_bits(struct extent_io_tree *tree, u64 start, + u64 end, int bits, gfp_t mask); +int clear_extent_bits(struct extent_io_tree *tree, u64 start, + u64 end, int bits, gfp_t mask); +int find_first_extent_bit(struct extent_io_tree *tree, u64 start, + u64 *start_ret, u64 *end_ret, int bits); +int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end, + int bits, int filled); +int set_extent_dirty(struct extent_io_tree *tree, u64 start, + u64 end, gfp_t mask); +int clear_extent_dirty(struct extent_io_tree *tree, u64 start, + u64 end, gfp_t mask); +static inline int set_extent_buffer_uptodate(struct extent_buffer *eb) +{ + eb->flags |= EXTENT_UPTODATE; + return 0; +} + +static inline int clear_extent_buffer_uptodate(struct extent_io_tree *tree, + struct extent_buffer *eb) +{ + eb->flags &= ~EXTENT_UPTODATE; + return 0; +} + +static inline int extent_buffer_uptodate(struct extent_buffer *eb) +{ + if (!eb || IS_ERR(eb)) + return 0; + if (eb->flags & EXTENT_UPTODATE) + return 1; + return 0; +} + +int set_state_private(struct extent_io_tree *tree, u64 start, u64 xprivate); +int get_state_private(struct extent_io_tree *tree, u64 start, u64 *xprivate); +struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree, + u64 bytenr, u32 blocksize); +struct extent_buffer *find_first_extent_buffer(struct extent_io_tree *tree, + u64 start); +struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree, + u64 bytenr, u32 blocksize); +struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src); +void free_extent_buffer(struct extent_buffer *eb); +int read_extent_from_disk(struct extent_buffer *eb, + unsigned long offset, unsigned long len); +int write_extent_to_disk(struct extent_buffer *eb); +int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv, + unsigned long start, unsigned long len); +void read_extent_buffer(struct extent_buffer *eb, void *dst, + unsigned long start, unsigned long len); +void write_extent_buffer(struct extent_buffer *eb, const void *src, + unsigned long start, unsigned long len); +void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src, + unsigned long dst_offset, unsigned long src_offset, + unsigned long len); +void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, + unsigned long src_offset, unsigned long len); +void memset_extent_buffer(struct extent_buffer *eb, char c, + unsigned long start, unsigned long len); +int extent_buffer_test_bit(struct extent_buffer *eb, unsigned long start, + unsigned long nr); +int set_extent_buffer_dirty(struct extent_buffer *eb); +int clear_extent_buffer_dirty(struct extent_buffer *eb); +int read_data_from_disk(struct btrfs_fs_info *info, void *buf, u64 offset, + u64 bytes, int mirror); +int write_data_to_disk(struct btrfs_fs_info *info, void *buf, u64 offset, + u64 bytes, int mirror); +#endif |