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-rw-r--r--drivers/md/dm-mpath.c11
-rw-r--r--drivers/md/dm.c11
-rw-r--r--include/linux/device-mapper.h3
3 files changed, 23 insertions, 2 deletions
diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c
index 075747e25f77..e08be94959fd 100644
--- a/drivers/md/dm-mpath.c
+++ b/drivers/md/dm-mpath.c
@@ -1299,8 +1299,17 @@ static int do_end_io(struct multipath *m, struct request *clone,
if (!error && !clone->errors)
return 0; /* I/O complete */
- if (noretry_error(error))
+ if (noretry_error(error)) {
+ if ((clone->cmd_flags & REQ_WRITE_SAME) &&
+ !clone->q->limits.max_write_same_sectors) {
+ struct queue_limits *limits;
+
+ /* device doesn't really support WRITE SAME, disable it */
+ limits = dm_get_queue_limits(dm_table_get_md(m->ti->table));
+ limits->max_write_same_sectors = 0;
+ }
return error;
+ }
if (mpio->pgpath)
fail_path(mpio->pgpath);
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 6a5e9ed2fcc3..7b0ccdc5d65c 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -2278,6 +2278,17 @@ struct target_type *dm_get_immutable_target_type(struct mapped_device *md)
}
/*
+ * The queue_limits are only valid as long as you have a reference
+ * count on 'md'.
+ */
+struct queue_limits *dm_get_queue_limits(struct mapped_device *md)
+{
+ BUG_ON(!atomic_read(&md->holders));
+ return &md->queue->limits;
+}
+EXPORT_SYMBOL_GPL(dm_get_queue_limits);
+
+/*
* Fully initialize a request-based queue (->elevator, ->request_fn, etc).
*/
static int dm_init_request_based_queue(struct mapped_device *md)
diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h
index 653073de09e3..ed419c62dde1 100644
--- a/include/linux/device-mapper.h
+++ b/include/linux/device-mapper.h
@@ -406,13 +406,14 @@ int dm_noflush_suspending(struct dm_target *ti);
union map_info *dm_get_mapinfo(struct bio *bio);
union map_info *dm_get_rq_mapinfo(struct request *rq);
+struct queue_limits *dm_get_queue_limits(struct mapped_device *md);
+
/*
* Geometry functions.
*/
int dm_get_geometry(struct mapped_device *md, struct hd_geometry *geo);
int dm_set_geometry(struct mapped_device *md, struct hd_geometry *geo);
-
/*-----------------------------------------------------------------
* Functions for manipulating device-mapper tables.
*---------------------------------------------------------------*/