diff options
| author | Joe Thornber <ejt@redhat.com> | 2015-04-13 08:45:25 (GMT) |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2015-06-11 21:13:04 (GMT) |
| commit | 6550f075f5087459f64c1af71298fc50b102af11 (patch) | |
| tree | 4822242b4a3499f0700905f725f3b5a44d254722 | |
| parent | a5d895a90bf57e5fe87edf48dd1852e7292d570d (diff) | |
| download | linux-6550f075f5087459f64c1af71298fc50b102af11.tar.xz | |
dm thin metadata: add dm_thin_remove_range()
Removes a range of blocks from the btree.
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
| -rw-r--r-- | drivers/md/dm-thin-metadata.c | 54 | ||||
| -rw-r--r-- | drivers/md/dm-thin-metadata.h | 2 |
2 files changed, 56 insertions, 0 deletions
diff --git a/drivers/md/dm-thin-metadata.c b/drivers/md/dm-thin-metadata.c index 94cf0db..8b521e3 100644 --- a/drivers/md/dm-thin-metadata.c +++ b/drivers/md/dm-thin-metadata.c @@ -1526,6 +1526,47 @@ static int __remove(struct dm_thin_device *td, dm_block_t block) return 0; } +static int __remove_range(struct dm_thin_device *td, dm_block_t begin, dm_block_t end) +{ + int r; + unsigned count; + struct dm_pool_metadata *pmd = td->pmd; + dm_block_t keys[1] = { td->id }; + __le64 value; + dm_block_t mapping_root; + + /* + * Find the mapping tree + */ + r = dm_btree_lookup(&pmd->tl_info, pmd->root, keys, &value); + if (r) + return r; + + /* + * Remove from the mapping tree, taking care to inc the + * ref count so it doesn't get deleted. + */ + mapping_root = le64_to_cpu(value); + dm_tm_inc(pmd->tm, mapping_root); + r = dm_btree_remove(&pmd->tl_info, pmd->root, keys, &pmd->root); + if (r) + return r; + + r = dm_btree_remove_leaves(&pmd->bl_info, mapping_root, &begin, end, &mapping_root, &count); + if (r) + return r; + + td->mapped_blocks -= count; + td->changed = 1; + + /* + * Reinsert the mapping tree. + */ + value = cpu_to_le64(mapping_root); + __dm_bless_for_disk(&value); + return dm_btree_insert(&pmd->tl_info, pmd->root, keys, &value, &pmd->root); +} + int dm_thin_remove_block(struct dm_thin_device *td, dm_block_t block) { int r = -EINVAL; @@ -1538,6 +1579,19 @@ int dm_thin_remove_block(struct dm_thin_device *td, dm_block_t block) return r; } +int dm_thin_remove_range(struct dm_thin_device *td, + dm_block_t begin, dm_block_t end) +{ + int r = -EINVAL; + + down_write(&td->pmd->root_lock); + if (!td->pmd->fail_io) + r = __remove_range(td, begin, end); + up_write(&td->pmd->root_lock); + + return r; +} + int dm_pool_block_is_used(struct dm_pool_metadata *pmd, dm_block_t b, bool *result) { int r; diff --git a/drivers/md/dm-thin-metadata.h b/drivers/md/dm-thin-metadata.h index f11f140..a938bab 100644 --- a/drivers/md/dm-thin-metadata.h +++ b/drivers/md/dm-thin-metadata.h @@ -167,6 +167,8 @@ int dm_thin_insert_block(struct dm_thin_device *td, dm_block_t block, dm_block_t data_block); int dm_thin_remove_block(struct dm_thin_device *td, dm_block_t block); +int dm_thin_remove_range(struct dm_thin_device *td, + dm_block_t begin, dm_block_t end); /* * Queries. |