[PATCH 3.19 61/75] dm thin: fix to consistently zero-fill reads to unprovisioned blocks

From: Greg Kroah-Hartman
Date: Fri Apr 10 2015 - 09:26:24 EST


3.19-stable review patch. If anyone has any objections, please let me know.

------------------

From: Joe Thornber <ejt@xxxxxxxxxx>

commit 5f027a3bf184d1d36e68745f7cd3718a8b879cc0 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
drivers/md/dm-thin.c | 11 -----------
1 file changed, 11 deletions(-)

--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -2357,17 +2357,6 @@ static int thin_bio_map(struct dm_target
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(tc, virt_cell);
- return DM_MAPIO_SUBMITTED;
- }
- /* fall through */
-
case -EWOULDBLOCK:
thin_defer_cell(tc, virt_cell);
return DM_MAPIO_SUBMITTED;


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/