This patch has been added to the 3.18 stable tree. If you have any
objections, please let us know.
===============
[ Upstream commit 5f027a3bf184d1d36e68745f7cd3718a8b879cc0 ]
It was always intended that a read to an unprovisioned block will return
zeroes regardless of whether the pool is in read-only or read-write
mode. thin_bio_map() was inconsistent with its handling of such reads
when the pool is in read-only mode, it now properly zero-fills the bios
it returns in response to unprovisioned block reads.
Eliminate thin_bio_map()'s special read-only mode handling of -ENODATA
and just allow the IO to be deferred to the worker which will result in
pool->process_bio() handling the IO (which already properly zero-fills
reads to unprovisioned blocks).
Reported-by: Eric Sandeen <sandeen@xxxxxxxxxx>
Signed-off-by: Joe Thornber <ejt@xxxxxxxxxx>
Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Sasha Levin <sasha.levin@xxxxxxxxxx>
---
drivers/md/dm-thin.c | 11 -----------
1 file changed, 11 deletions(-)
diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c
index ac6b0ff..0801e35 100644
--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -2003,17 +2003,6 @@ static int thin_bio_map(struct dm_target *ti, struct bio *bio)
return DM_MAPIO_REMAPPED;
case -ENODATA:
- if (get_pool_mode(tc->pool) == PM_READ_ONLY) {
- /*
- * This block isn't provisioned, and we have no way
- * of doing so.
- */
- handle_unserviceable_bio(tc->pool, bio);
- cell_defer_no_holder_no_free(tc, &cell1);
- return DM_MAPIO_SUBMITTED;
- }
- /* fall through */
-
case -EWOULDBLOCK:
/*
* In future, the failed dm_thin_find_block above could
--
2.1.0
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