[PATCH 3.18 032/144] dm thin: restore requested error_if_no_space setting on OODS to WRITE transition
- Date: Thu, 8 Nov 2018 13:50:03 -0800
- From: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
- Subject: [PATCH 3.18 032/144] dm thin: restore requested error_if_no_space setting on OODS to WRITE transition
3.18-stable review patch. If anyone has any objections, please let me know.
[ Upstream commit 172c238612ebf81cabccc86b788c9209af591f61 ]
A thin-pool that is in out-of-data-space (OODS) mode may transition back
to write mode -- without the admin adding more space to the thin-pool --
if/when blocks are released (either by deleting thin devices or
discarding provisioned blocks).
But as part of the thin-pool's earlier transition to out-of-data-space
mode the thin-pool may have set the 'error_if_no_space' flag to true if
the no_space_timeout expires without more space having been made
available. That implementation detail, of changing the pool's
error_if_no_space setting, needs to be reset back to the default that
the user specified when the thin-pool's table was loaded.
Otherwise we'll drop the user requested behaviour on the floor when this
out-of-data-space to write mode transition occurs.
Reported-by: Vivek Goyal <vgoyal@xxxxxxxxxx>
Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
Acked-by: Joe Thornber <ejt@xxxxxxxxxx>
Fixes: 2c43fd26e4 ("dm thin: fix missing out-of-data-space to write mode transition if blocks are released")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
drivers/md/dm-thin.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c
index 68c7102a64c8..936c57b57539 100644
@@ -1909,6 +1909,7 @@ static void set_pool_mode(struct pool *pool, enum pool_mode new_mode)
if (old_mode != new_mode)
+ pool->pf.error_if_no_space = pt->requested_pf.error_if_no_space;
pool->process_bio = process_bio;
pool->process_discard = process_discard;