diff options
| author |   Joe Thornber <ejt@redhat.com> | 2013-12-04 16:58:19 -0500 |
|---|---|---|
| committer |   Mike Snitzer <snitzer@redhat.com> | 2013-12-10 16:35:13 -0500 |
| commit | 9b7aaa64f96f7ca280d75326fca42f42017b89ef (patch) | |
| tree | a0028aeb56bc229e9bc7b1dfcecbb3f03d213131 /drivers/md/persistent-data | |
| parent | dm thin: re-establish read-only state when switching to fail mode (diff) | |
| download | linux-dev-9b7aaa64f96f7ca280d75326fca42f42017b89ef.tar.xz linux-dev-9b7aaa64f96f7ca280d75326fca42f42017b89ef.zip | |
dm thin: allow pool in read-only mode to transition to read-write mode
A thin-pool may be in read-only mode because the pool's data or metadata
space was exhausted. To allow for recovery, by adding more space to the
pool, we must allow a pool to transition from PM_READ_ONLY to PM_WRITE
mode. Otherwise, running out of space will render the pool permanently
read-only.
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org
Diffstat (limited to 'drivers/md/persistent-data')
| -rw-r--r-- | drivers/md/persistent-data/dm-block-manager.c | 6 | ||||
| -rw-r--r-- | drivers/md/persistent-data/dm-block-manager.h | 7 |
2 files changed, 10 insertions, 3 deletions
diff --git a/drivers/md/persistent-data/dm-block-manager.c b/drivers/md/persistent-data/dm-block-manager.c index a7e8bf296388..064a3c271baa 100644 --- a/drivers/md/persistent-data/dm-block-manager.c +++ b/drivers/md/persistent-data/dm-block-manager.c @@ -626,6 +626,12 @@ void dm_bm_set_read_only(struct dm_block_manager *bm) } EXPORT_SYMBOL_GPL(dm_bm_set_read_only); +void dm_bm_set_read_write(struct dm_block_manager *bm) +{ + bm->read_only = false; +} +EXPORT_SYMBOL_GPL(dm_bm_set_read_write); + u32 dm_bm_checksum(const void *data, size_t len, u32 init_xor) { return crc32c(~(u32) 0, data, len) ^ init_xor; diff --git a/drivers/md/persistent-data/dm-block-manager.h b/drivers/md/persistent-data/dm-block-manager.h index 9a82083a66b6..13cd58e1fe69 100644 --- a/drivers/md/persistent-data/dm-block-manager.h +++ b/drivers/md/persistent-data/dm-block-manager.h @@ -108,9 +108,9 @@ int dm_bm_unlock(struct dm_block *b); int dm_bm_flush_and_unlock(struct dm_block_manager *bm, struct dm_block *superblock); - /* - * Request data be prefetched into the cache. - */ +/* + * Request data is prefetched into the cache. + */ void dm_bm_prefetch(struct dm_block_manager *bm, dm_block_t b); /* @@ -125,6 +125,7 @@ void dm_bm_prefetch(struct dm_block_manager *bm, dm_block_t b); * be returned if you do. */ void dm_bm_set_read_only(struct dm_block_manager *bm); +void dm_bm_set_read_write(struct dm_block_manager *bm); u32 dm_bm_checksum(const void *data, size_t len, u32 init_xor); |