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4c0c8cfc84
The function btrfs_drop_extent_cache() doesn't really belong at file.c because what it does is drop a range of extent maps for a file range. It directly allocates and manipulates extent maps, by dropping, splitting and replacing them in an extent map tree, so it should be located at extent_map.c, where all manipulations of an extent map tree and its extent maps are supposed to be done. So move it out of file.c and into extent_map.c. Additionally do the following changes: 1) Rename it into btrfs_drop_extent_map_range(), as this makes it more clear about what it does. The term "cache" is a bit confusing as it's not widely used, "extent maps" or "extent mapping" is much more common; 2) Change its 'skip_pinned' argument from int to bool; 3) Turn several of its local variables from int to bool, since they are used as booleans; 4) Move the declaration of some variables out of the function's main scope and into the scopes where they are used; 5) Remove pointless assignment of false to 'modified' early in the while loop, as later that variable is set and it's not used before that second assignment; 6) Remove checks for NULL before calling free_extent_map(). Signed-off-by: Filipe Manana <fdmanana@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
113 lines
3.1 KiB
C
113 lines
3.1 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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#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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/* used only during fiemap calls */
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#define EXTENT_MAP_DELALLOC ((u64)-1)
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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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EXTENT_FLAG_PINNED,
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EXTENT_FLAG_COMPRESSED,
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/* pre-allocated extent */
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EXTENT_FLAG_PREALLOC,
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/* Logging this extent */
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EXTENT_FLAG_LOGGING,
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/* Filling in a preallocated extent */
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EXTENT_FLAG_FILLING,
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/* filesystem extent mapping type */
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EXTENT_FLAG_FS_MAPPING,
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/* This em is merged from two or more physically adjacent ems */
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EXTENT_FLAG_MERGED,
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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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unsigned long flags;
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/* Used for chunk mappings, flag EXTENT_FLAG_FS_MAPPING must be set */
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struct map_lookup *map_lookup;
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refcount_t refs;
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unsigned int compress_type;
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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 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(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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static inline u64 extent_map_block_end(struct extent_map *em)
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{
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if (em->block_start + em->block_len < em->block_start)
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return (u64)-1;
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return em->block_start + em->block_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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int add_extent_mapping(struct extent_map_tree *tree,
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struct extent_map *em, int modified);
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void remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em);
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void replace_extent_mapping(struct extent_map_tree *tree,
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struct extent_map *cur,
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struct extent_map *new,
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int modified);
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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 extent_map_tree *tree, 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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#endif
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