diff options
| -rw-r--r-- | drivers/md/dm-thin-metadata.c | 26 |
1 files changed, 23 insertions, 3 deletions
diff --git a/drivers/md/dm-thin-metadata.c b/drivers/md/dm-thin-metadata.c index fd63485b27e9..7f0840601737 100644 --- a/drivers/md/dm-thin-metadata.c +++ b/drivers/md/dm-thin-metadata.c @@ -202,6 +202,13 @@ struct dm_pool_metadata { bool fail_io:1; /* + * Set once a thin-pool has been accessed through one of the interfaces + * that imply the pool is in-service (e.g. thin devices created/deleted, + * thin-pool message, metadata snapshots, etc). + */ + bool in_service:1; + + /* * Reading the space map roots can fail, so we read it into these * buffers before the superblock is locked and updated. */ @@ -367,6 +374,10 @@ static int subtree_equal(void *context, const void *value1_le, const void *value /*----------------------------------------------------------------*/ +/* + * Variant that is used for in-core only changes or code that + * shouldn't put the pool in service on its own (e.g. commit). + */ static inline void __pmd_write_lock(struct dm_pool_metadata *pmd) __acquires(pmd->root_lock) { @@ -377,6 +388,8 @@ static inline void __pmd_write_lock(struct dm_pool_metadata *pmd) static inline void pmd_write_lock(struct dm_pool_metadata *pmd) { __pmd_write_lock(pmd); + if (unlikely(!pmd->in_service)) + pmd->in_service = true; } static inline void pmd_write_unlock(struct dm_pool_metadata *pmd) @@ -810,6 +823,9 @@ static int __commit_transaction(struct dm_pool_metadata *pmd) */ BUILD_BUG_ON(sizeof(struct thin_disk_superblock) > 512); + if (unlikely(!pmd->in_service)) + return 0; + r = __write_changed_details(pmd); if (r < 0) return r; @@ -873,6 +889,7 @@ struct dm_pool_metadata *dm_pool_metadata_open(struct block_device *bdev, pmd->time = 0; INIT_LIST_HEAD(&pmd->thin_devices); pmd->fail_io = false; + pmd->in_service = false; pmd->bdev = bdev; pmd->data_block_size = data_block_size; @@ -923,7 +940,6 @@ int dm_pool_metadata_close(struct dm_pool_metadata *pmd) DMWARN("%s: __commit_transaction() failed, error = %d", __func__, r); } - if (!pmd->fail_io) __destroy_persistent_data_objects(pmd); @@ -1802,12 +1818,16 @@ int dm_pool_commit_metadata(struct dm_pool_metadata *pmd) { int r = -EINVAL; - pmd_write_lock(pmd); + /* + * Care is taken to not have commit be what + * triggers putting the thin-pool in-service. + */ + __pmd_write_lock(pmd); if (pmd->fail_io) goto out; r = __commit_transaction(pmd); - if (r <= 0) + if (r < 0) goto out; /* |