142 lines
3.9 KiB
C
142 lines
3.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef BTRFS_EXTENT_MAP_H
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#define BTRFS_EXTENT_MAP_H
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#include <linux/rbtree.h>
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#include <linux/refcount.h>
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#include "compression.h"
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#define EXTENT_MAP_LAST_BYTE ((u64)-4)
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#define EXTENT_MAP_HOLE ((u64)-3)
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#define EXTENT_MAP_INLINE ((u64)-2)
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/* bits for the extent_map::flags field */
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enum {
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/* this entry not yet on disk, don't free it */
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ENUM_BIT(EXTENT_FLAG_PINNED),
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ENUM_BIT(EXTENT_FLAG_COMPRESS_ZLIB),
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ENUM_BIT(EXTENT_FLAG_COMPRESS_LZO),
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ENUM_BIT(EXTENT_FLAG_COMPRESS_ZSTD),
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/* pre-allocated extent */
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ENUM_BIT(EXTENT_FLAG_PREALLOC),
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/* Logging this extent */
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ENUM_BIT(EXTENT_FLAG_LOGGING),
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/* Filling in a preallocated extent */
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ENUM_BIT(EXTENT_FLAG_FILLING),
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/* This em is merged from two or more physically adjacent ems */
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ENUM_BIT(EXTENT_FLAG_MERGED),
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};
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/*
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* Keep this structure as compact as possible, as we can have really large
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* amounts of allocated extent maps at any time.
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*/
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struct extent_map {
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struct rb_node rb_node;
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/* all of these are in bytes */
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u64 start;
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u64 len;
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u64 mod_start;
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u64 mod_len;
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u64 orig_start;
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u64 orig_block_len;
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u64 ram_bytes;
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u64 block_start;
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u64 block_len;
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/*
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* Generation of the extent map, for merged em it's the highest
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* generation of all merged ems.
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* For non-merged extents, it's from btrfs_file_extent_item::generation.
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*/
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u64 generation;
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u32 flags;
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refcount_t refs;
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struct list_head list;
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};
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struct extent_map_tree {
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struct rb_root_cached map;
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struct list_head modified_extents;
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rwlock_t lock;
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};
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struct btrfs_inode;
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static inline void extent_map_set_compression(struct extent_map *em,
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enum btrfs_compression_type type)
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{
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if (type == BTRFS_COMPRESS_ZLIB)
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em->flags |= EXTENT_FLAG_COMPRESS_ZLIB;
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else if (type == BTRFS_COMPRESS_LZO)
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em->flags |= EXTENT_FLAG_COMPRESS_LZO;
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else if (type == BTRFS_COMPRESS_ZSTD)
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em->flags |= EXTENT_FLAG_COMPRESS_ZSTD;
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}
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static inline enum btrfs_compression_type extent_map_compression(const struct extent_map *em)
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{
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if (em->flags & EXTENT_FLAG_COMPRESS_ZLIB)
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return BTRFS_COMPRESS_ZLIB;
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if (em->flags & EXTENT_FLAG_COMPRESS_LZO)
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return BTRFS_COMPRESS_LZO;
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if (em->flags & EXTENT_FLAG_COMPRESS_ZSTD)
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return BTRFS_COMPRESS_ZSTD;
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return BTRFS_COMPRESS_NONE;
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}
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/*
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* More efficient way to determine if extent is compressed, instead of using
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* 'extent_map_compression() != BTRFS_COMPRESS_NONE'.
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*/
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static inline bool extent_map_is_compressed(const struct extent_map *em)
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{
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return (em->flags & (EXTENT_FLAG_COMPRESS_ZLIB |
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EXTENT_FLAG_COMPRESS_LZO |
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EXTENT_FLAG_COMPRESS_ZSTD)) != 0;
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}
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static inline int extent_map_in_tree(const struct extent_map *em)
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{
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return !RB_EMPTY_NODE(&em->rb_node);
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}
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static inline u64 extent_map_end(const struct extent_map *em)
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{
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if (em->start + em->len < em->start)
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return (u64)-1;
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return em->start + em->len;
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}
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void extent_map_tree_init(struct extent_map_tree *tree);
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struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree,
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u64 start, u64 len);
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void remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em);
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int split_extent_map(struct btrfs_inode *inode, u64 start, u64 len, u64 pre,
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u64 new_logical);
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struct extent_map *alloc_extent_map(void);
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void free_extent_map(struct extent_map *em);
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int __init extent_map_init(void);
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void __cold extent_map_exit(void);
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int unpin_extent_cache(struct btrfs_inode *inode, u64 start, u64 len, u64 gen);
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void clear_em_logging(struct extent_map_tree *tree, struct extent_map *em);
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struct extent_map *search_extent_mapping(struct extent_map_tree *tree,
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u64 start, u64 len);
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int btrfs_add_extent_mapping(struct btrfs_fs_info *fs_info,
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struct extent_map_tree *em_tree,
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struct extent_map **em_in, u64 start, u64 len);
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void btrfs_drop_extent_map_range(struct btrfs_inode *inode,
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u64 start, u64 end,
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bool skip_pinned);
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int btrfs_replace_extent_map_range(struct btrfs_inode *inode,
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struct extent_map *new_em,
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bool modified);
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#endif
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