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dm thin: allow pool in read-only mode to transition to read-write mode

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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
This commit is contained in:
Joe Thornber
2013-12-04 16:58:19 -05:00
committed by Mike Snitzer
parent 5383ef3a92
commit 9b7aaa64f9
5 changed files with 29 additions and 5 deletions
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6
drivers/md/persistent-data/dm-block-manager.c
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@@ -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;