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dm thin metadata: fix bug in dm_thin_remove_range()

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dm_btree_remove_leaves() only unmaps a contiguous region so we need a
loop, in __remove_range(), to handle ranges that contain multiple
regions.

A new btree function, dm_btree_lookup_next(), is introduced which is
more efficiently able to skip over regions of the thin device which
aren't mapped.  __remove_range() uses dm_btree_lookup_next() for each
iteration of __remove_range()'s loop.

Also, improve description of dm_btree_remove_leaves().

Fixes: 6550f075 ("dm thin metadata: add dm_thin_remove_range()")
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org # 4.1+
This commit is contained in:
Joe Thornber
2015-12-02 12:24:39 +00:00
committed by Mike Snitzer
parent 30ce6e1cc5
commit 993ceab919
3 changed files with 115 additions and 8 deletions
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14
drivers/md/persistent-data/dm-btree.h
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@@ -109,6 +109,13 @@ int dm_btree_del(struct dm_btree_info *info, dm_block_t root);
int dm_btree_lookup(struct dm_btree_info *info, dm_block_t root,
uint64_t *keys, void *value_le);
/*
* Tries to find the first key where the bottom level key is >= to that
* given. Useful for skipping empty sections of the btree.
*/
int dm_btree_lookup_next(struct dm_btree_info *info, dm_block_t root,
uint64_t *keys, uint64_t *rkey, void *value_le);
/*
* Insertion (or overwrite an existing value). O(ln(n))
*/
@@ -135,9 +142,10 @@ int dm_btree_remove(struct dm_btree_info *info, dm_block_t root,
uint64_t *keys, dm_block_t *new_root);
/*
* Removes values between 'keys' and keys2, where keys2 is keys with the
* final key replaced with 'end_key'. 'end_key' is the one-past-the-end
* value. 'keys' may be altered.
* Removes a _contiguous_ run of values starting from 'keys' and not
* reaching keys2 (where keys2 is keys with the final key replaced with
* 'end_key'). 'end_key' is the one-past-the-end value. 'keys' may be
* altered.
*/
int dm_btree_remove_leaves(struct dm_btree_info *info, dm_block_t root,
uint64_t *keys, uint64_t end_key,