dm zoned: fix zone state management race

dm-zoned uses the zone flag DMZ_ACTIVE to indicate that a zone of the
backend device is being actively read or written and so cannot be
reclaimed. This flag is set as long as the zone atomic reference
counter is not 0. When this atomic is decremented and reaches 0 (e.g.
on BIO completion), the active flag is cleared and set again whenever
the zone is reused and BIO issued with the atomic counter incremented.
These 2 operations (atomic inc/dec and flag set/clear) are however not
always executed atomically under the target metadata mutex lock and
this causes the warning:

WARN_ON(!test_bit(DMZ_ACTIVE, &zone->flags));

in dmz_deactivate_zone() to be displayed. This problem is regularly
triggered with xfstests generic/209, generic/300, generic/451 and
xfs/077 with XFS being used as the file system on the dm-zoned target
device. Similarly, xfstests ext4/303, ext4/304, generic/209 and
generic/300 trigger the warning with ext4 use.

This problem can be easily fixed by simply removing the DMZ_ACTIVE flag
and managing the "ACTIVE" state by directly looking at the reference
counter value. To do so, the functions dmz_activate_zone() and
dmz_deactivate_zone() are changed to inline functions respectively
calling atomic_inc() and atomic_dec(), while the dmz_is_active() macro
is changed to an inline function calling atomic_read().

Fixes: 3b1a94c88b79 ("dm zoned: drive-managed zoned block device target")
Cc: stable@vger.kernel.org
Reported-by: Masato Suzuki <masato.suzuki@wdc.com>
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

1 files changed, 0 insertions, 24 deletions

diff --git a/drivers/md/dm-zoned-metadata.c b/drivers/md/dm-zoned-metadata.c
index d8334cd45d7c..4cdde7a02e94 100644
--- a/drivers/md/dm-zoned-metadata.c
+++ b/drivers/md/dm-zoned-metadata.c
@@ -1594,30 +1594,6 @@ struct dm_zone *dmz_get_zone_for_reclaim(struct dmz_metadata *zmd)
 }
 
 /*
- * Activate a zone (increment its reference count).
- */
-void dmz_activate_zone(struct dm_zone *zone)
-{
-	set_bit(DMZ_ACTIVE, &zone->flags);
-	atomic_inc(&zone->refcount);
-}
-
-/*
- * Deactivate a zone. This decrement the zone reference counter
- * and clears the active state of the zone once the count reaches 0,
- * indicating that all BIOs to the zone have completed. Returns
- * true if the zone was deactivated.
- */
-void dmz_deactivate_zone(struct dm_zone *zone)
-{
-	if (atomic_dec_and_test(&zone->refcount)) {
-		WARN_ON(!test_bit(DMZ_ACTIVE, &zone->flags));
-		clear_bit_unlock(DMZ_ACTIVE, &zone->flags);
-		smp_mb__after_atomic();
-	}
-}
-
-/*
  * Get the zone mapping a chunk, if the chunk is mapped already.
  * If no mapping exist and the operation is WRITE, a zone is
  * allocated and used to map the chunk.