forked from luck/tmp_suning_uos_patched
b11e234d21
We are going to use EM's to log extents in the future, so we need to not mark them as prealloc if they aren't actually prealloc extents. Instead mark them with FILLING so we know to ammend mod_start/mod_len and that way we don't confuse the extent logging code. Thanks, Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
75 lines
2.0 KiB
C
75 lines
2.0 KiB
C
#ifndef __EXTENTMAP__
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#define __EXTENTMAP__
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#include <linux/rbtree.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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#define EXTENT_MAP_DELALLOC (u64)-1
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/* bits for the flags field */
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#define EXTENT_FLAG_PINNED 0 /* this entry not yet on disk, don't free it */
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#define EXTENT_FLAG_COMPRESSED 1
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#define EXTENT_FLAG_VACANCY 2 /* no file extent item found */
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#define EXTENT_FLAG_PREALLOC 3 /* pre-allocated extent */
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#define EXTENT_FLAG_LOGGING 4 /* Logging this extent */
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#define EXTENT_FLAG_FILLING 5 /* Filling in a preallocated extent */
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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 block_start;
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u64 block_len;
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u64 generation;
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unsigned long flags;
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struct block_device *bdev;
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atomic_t refs;
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unsigned int in_tree;
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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 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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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);
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int remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em);
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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 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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struct extent_map *search_extent_mapping(struct extent_map_tree *tree,
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u64 start, u64 len);
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#endif
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