diff options
Diffstat (limited to 'drivers/md/dm-thin-metadata.c')
| -rw-r--r-- | drivers/md/dm-thin-metadata.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/drivers/md/dm-thin-metadata.c b/drivers/md/dm-thin-metadata.c index 60bce435f4f..7da34766555 100644 --- a/drivers/md/dm-thin-metadata.c +++ b/drivers/md/dm-thin-metadata.c @@ -1349,6 +1349,12 @@ dm_thin_id dm_thin_dev_id(struct dm_thin_device *td) return td->id; } +/* + * Check whether @time (of block creation) is older than @td's last snapshot. + * If so then the associated block is shared with the last snapshot device. + * Any block on a device created *after* the device last got snapshotted is + * necessarily not shared. + */ static bool __snapshotted_since(struct dm_thin_device *td, uint32_t time) { return td->snapshotted_time > time; @@ -1458,6 +1464,20 @@ int dm_thin_remove_block(struct dm_thin_device *td, dm_block_t block) return r; } +int dm_pool_block_is_used(struct dm_pool_metadata *pmd, dm_block_t b, bool *result) +{ + int r; + uint32_t ref_count; + + down_read(&pmd->root_lock); + r = dm_sm_get_count(pmd->data_sm, b, &ref_count); + if (!r) + *result = (ref_count != 0); + up_read(&pmd->root_lock); + + return r; +} + bool dm_thin_changed_this_transaction(struct dm_thin_device *td) { int r; @@ -1697,6 +1717,14 @@ void dm_pool_metadata_read_only(struct dm_pool_metadata *pmd) up_write(&pmd->root_lock); } +void dm_pool_metadata_read_write(struct dm_pool_metadata *pmd) +{ + down_write(&pmd->root_lock); + pmd->read_only = false; + dm_bm_set_read_write(pmd->bm); + up_write(&pmd->root_lock); +} + int dm_pool_register_metadata_threshold(struct dm_pool_metadata *pmd, dm_block_t threshold, dm_sm_threshold_fn fn, |