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btrfs-progs: Pull free space tree related code from kernel
To help implement free space tree checker in user space some kernel function are necessary, namely iterating/deleting/adding freespace items, some internal search functions. Functions to populate a block group based on the extent tree. The code is largely copy/paste from the kernel with locking eliminated (i.e free_space_lock). It supports reading/writing of both bitmap and extent based FST trees. Signed-off-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
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74
ctree.c
74
ctree.c
@ -1225,6 +1225,80 @@ again:
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return 1;
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}
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/*
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* Helper to use instead of search slot if no exact match is needed but
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* instead the next or previous item should be returned.
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* When find_higher is true, the next higher item is returned, the next lower
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* otherwise.
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* When return_any and find_higher are both true, and no higher item is found,
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* return the next lower instead.
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* When return_any is true and find_higher is false, and no lower item is found,
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* return the next higher instead.
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* It returns 0 if any item is found, 1 if none is found (tree empty), and
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* < 0 on error
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*/
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int btrfs_search_slot_for_read(struct btrfs_root *root,
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const struct btrfs_key *key,
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struct btrfs_path *p, int find_higher,
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int return_any)
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{
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int ret;
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struct extent_buffer *leaf;
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again:
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ret = btrfs_search_slot(NULL, root, key, p, 0, 0);
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if (ret <= 0)
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return ret;
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/*
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* A return value of 1 means the path is at the position where the item
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* should be inserted. Normally this is the next bigger item, but in
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* case the previous item is the last in a leaf, path points to the
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* first free slot in the previous leaf, i.e. at an invalid item.
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*/
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leaf = p->nodes[0];
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if (find_higher) {
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if (p->slots[0] >= btrfs_header_nritems(leaf)) {
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ret = btrfs_next_leaf(root, p);
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if (ret <= 0)
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return ret;
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if (!return_any)
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return 1;
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/*
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* No higher item found, return the next lower instead
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*/
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return_any = 0;
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find_higher = 0;
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btrfs_release_path(p);
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goto again;
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}
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} else {
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if (p->slots[0] == 0) {
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ret = btrfs_prev_leaf(root, p);
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if (ret < 0)
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return ret;
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if (!ret) {
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leaf = p->nodes[0];
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if (p->slots[0] == btrfs_header_nritems(leaf))
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p->slots[0]--;
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return 0;
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}
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if (!return_any)
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return 1;
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/*
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* No lower item found, return the next higher instead
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*/
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return_any = 0;
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find_higher = 1;
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btrfs_release_path(p);
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goto again;
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} else {
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--p->slots[0];
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}
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}
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return 0;
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}
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/*
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* adjust the pointers going up the tree, starting at level
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* making sure the right key of each node is points to 'key'.
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15
ctree.h
15
ctree.h
@ -1071,6 +1071,17 @@ struct btrfs_block_group_cache {
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u64 flags;
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int cached;
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int ro;
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/*
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* If the free space extent count exceeds this number, convert the block
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* group to bitmaps.
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*/
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u32 bitmap_high_thresh;
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/*
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* If the free space extent count drops below this number, convert the
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* block group back to extents.
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*/
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u32 bitmap_low_thresh;
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};
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struct btrfs_device;
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@ -2596,6 +2607,10 @@ int btrfs_split_item(struct btrfs_trans_handle *trans,
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int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
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*root, struct btrfs_key *key, struct btrfs_path *p, int
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ins_len, int cow);
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int btrfs_search_slot_for_read(struct btrfs_root *root,
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const struct btrfs_key *key,
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struct btrfs_path *p, int find_higher,
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int return_any);
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int btrfs_find_item(struct btrfs_root *fs_root, struct btrfs_path *found_path,
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u64 iobjectid, u64 ioff, u8 key_type,
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struct btrfs_key *found_key);
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1249
free-space-tree.c
1249
free-space-tree.c
File diff suppressed because it is too large
Load Diff
@ -19,8 +19,20 @@
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#ifndef __BTRFS_FREE_SPACE_TREE_H__
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#define __BTRFS_FREE_SPACE_TREE_H__
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#define BTRFS_FREE_SPACE_BITMAP_SIZE 256
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#define BTRFS_FREE_SPACE_BITMAP_BITS (BTRFS_FREE_SPACE_BITMAP_SIZE * BITS_PER_BYTE)
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int btrfs_clear_free_space_tree(struct btrfs_fs_info *fs_info);
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int load_free_space_tree(struct btrfs_fs_info *fs_info,
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struct btrfs_block_group_cache *block_group);
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int populate_free_space_tree(struct btrfs_trans_handle *trans,
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struct btrfs_block_group_cache *block_group);
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int remove_block_group_free_space(struct btrfs_trans_handle *trans,
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struct btrfs_block_group_cache *block_group);
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int add_to_free_space_tree(struct btrfs_trans_handle *trans, u64 start,
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u64 size);
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int remove_from_free_space_tree(struct btrfs_trans_handle *trans, u64 start,
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u64 size);
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int btrfs_create_free_space_tree(struct btrfs_fs_info *info);
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#endif
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@ -263,6 +263,8 @@ static inline int IS_ERR_OR_NULL(const void *ptr)
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return !ptr || IS_ERR(ptr);
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}
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#define div_u64(x, y) ((x) / (y))
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/**
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* swap - swap values of @a and @b
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* @a: first value
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@ -297,6 +299,10 @@ static inline int IS_ERR_OR_NULL(const void *ptr)
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#define kfree(x) free(x)
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#define vmalloc(x) malloc(x)
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#define vfree(x) free(x)
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#define kvzalloc(x, y) kzalloc(x,y)
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#define kvfree(x) free(x)
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#define memalloc_nofs_save() (0)
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#define memalloc_nofs_restore(x) ((void)(x))
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#ifndef BTRFS_DISABLE_BACKTRACE
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static inline void assert_trace(const char *assertion, const char *filename,
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