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dm mpath: stop queueing IO when no valid paths exist

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'queue_io' is set so that IO is queued while paths are being
initialized.  Clear queue_io in __choose_pgpath if there are no valid
paths, since there are obviously no paths that can be initialized.
Otherwise IOs to the device will back up.

Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Benjamin Marzinski 2014-08-13 13:53:42 -05:00 committed by Mike Snitzer
parent 3d8aab2d2c
commit 1f27197247
1 changed files with 3 additions and 1 deletions
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4
drivers/md/dm-mpath.c
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@ -317,8 +317,10 @@ static void __choose_pgpath(struct multipath *m, size_t nr_bytes)
struct priority_group *pg;
unsigned bypassed = 1;
if (!m->nr_valid_paths)
if (!m->nr_valid_paths) {
m->queue_io = 0;
goto failed;
}
/* Were we instructed to switch PG? */
if (m->next_pg) {