@@ -1999,6 +1999,37 @@ static int device_requires_stable_pages(struct dm_target *ti,
return blk_queue_stable_writes(q);
}
+#ifdef CONFIG_BLK_DEV_ZONED
+static int device_not_zone_append_capable(struct dm_target *ti,
+ struct dm_dev *dev, sector_t start,
+ sector_t len, void *data)
+{
+ struct request_queue *q = bdev_get_queue(dev->bdev);
+
+ return !blk_queue_is_zoned(q) ||
+ !q->limits.max_zone_append_sectors;
+}
+
+static bool dm_table_supports_zone_append(struct dm_table *t)
+{
+ struct dm_target *ti;
+ unsigned int i;
+
+ for (i = 0; i < dm_table_get_num_targets(t); i++) {
+ ti = dm_table_get_target(t, i);
+
+ if (ti->zone_append_not_supported)
+ return false;
+
+ if (!ti->type->iterate_devices ||
+ ti->type->iterate_devices(ti, device_not_zone_append_capable, NULL))
+ return false;
+ }
+
+ return true;
+}
+#endif
+
void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
struct queue_limits *limits)
{
@@ -2091,6 +2122,16 @@ void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
if (blk_queue_is_zoned(q)) {
WARN_ON_ONCE(queue_is_mq(q));
q->nr_zones = blkdev_nr_zones(t->md->disk);
+
+ /*
+ * All zoned devices support zone append by default. However,
+ * some zoned targets (e.g. dm-crypt) cannot support this
+ * operation. Check here if the target indicated the lack of
+ * support for zone append and set max_zone_append_sectors to 0
+ * in that case so that users (e.g. an FS) can detect this fact.
+ */
+ if (!dm_table_supports_zone_append(t))
+ q->limits.max_zone_append_sectors = 0;
}
#endif
@@ -361,6 +361,12 @@ struct dm_target {
* Set if we need to limit the number of in-flight bios when swapping.
*/
bool limit_swap_bios:1;
+
+ /*
+ * Set if this target is a zoned device that cannot accept
+ * zone append operations.
+ */
+ bool zone_append_not_supported:1;
};
void *dm_per_bio_data(struct bio *bio, size_t data_size);
Add the boolean field zone_append_not_supported to the dm_target structure to allow a target implementing a zoned block device to explicitly opt out from zone append (REQ_OP_ZONE_APPEND) operations support. When set to true by the target constructor, the target device queue limit max_zone_append_sectors is set to 0 in dm_table_set_restrictions() so that users of the target (e.g. file systems) can detect that the device cannot process zone append operations. Detection for the target support of zone append is done similarly to the detection for other device features such as secure erase, using a helper function. For zone append, the function dm_table_supports_zone_append() is defined if CONFIG_BLK_DEV_ZONED is enabled. Fixes: 8e225f04d2dd ("dm crypt: Enable zoned block device support") Cc: stable@vger.kernel.org Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com> Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> --- drivers/md/dm-table.c | 41 +++++++++++++++++++++++++++++++++++ include/linux/device-mapper.h | 6 +++++ 2 files changed, 47 insertions(+)