| /* |
| * 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 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 |