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extent_io.h
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/* * 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