[PATCH v7 14/16] block: fail zone management operations to read-only and offline zones

[Damien Le Moal <dlemoal@kernel.org>]

Any zone management operation targeting a zone that is in the read-only
or offline condition will fail. So there is no point in issuing such
BIO. Modify the check in submit_bio_noacct() to use the new helper
function bdev_zone_mgmt_allowed() to check that a zone is sequential (as
was checked before) and also that the zone is not offline nor read-only.

Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Hannes Reinecke <hare@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
---
 block/blk-core.c  |  7 +++++--
 block/blk-zoned.c | 25 +++++++++++++++++++++++++
 block/blk.h       |  6 ++++++
 3 files changed, 36 insertions(+), 2 deletions(-)

diff --git a/block/blk-core.c b/block/blk-core.c
index 196bccf27f58..13dc70e8f55d 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -901,8 +901,11 @@ void submit_bio_noacct(struct bio *bio)
 	case REQ_OP_ZONE_CLOSE:
 	case REQ_OP_ZONE_RESET:
 	case REQ_OP_ZONE_FINISH:
-		/* Zone management operations require sequential zones. */
-		if (!bdev_zone_is_seq(bio->bi_bdev, bio->bi_iter.bi_sector))
+		/*
+		 * Zone management operations require sequential zones that are
+		 * not offline nor read-only.
+		 */
+		if (!bdev_zone_mgmt_allowed(bdev, bio->bi_iter.bi_sector))
 			goto end_io;
 		break;
 	case REQ_OP_ZONE_RESET_ALL:
diff --git a/block/blk-zoned.c b/block/blk-zoned.c
index ecaeacf3b287..c653cfc9823c 100644
--- a/block/blk-zoned.c
+++ b/block/blk-zoned.c
@@ -322,6 +322,31 @@ bool bdev_zone_is_seq(struct block_device *bdev, sector_t sector)
 }
 EXPORT_SYMBOL_GPL(bdev_zone_is_seq);
 
+/**
+ * bdev_zone_mgmt_allowed - check if management operations are allowed on a zone
+ * @bdev:       block device to check
+ * @sector:     sector number
+ *
+ * Check if the zone containing @sector on @bdev can be a target for a zone
+ * management operation, that is, if the zone is a sequential write required
+ * zone that is not offline nor read-only.
+ */
+bool bdev_zone_mgmt_allowed(struct block_device *bdev, sector_t sector)
+{
+	enum blk_zone_cond cond;
+	u8 zs;
+
+	if (!bdev_is_zoned(bdev))
+		return false;
+
+	zs = disk_zone_get_state(bdev->bd_disk, sector);
+	if (blk_zstate_is_conv(zs))
+		return false;
+
+	cond = blk_zstate_to_zone_cond(zs);
+	return !disk_zone_cond_is_offline_or_readonly(cond);
+}
+
 /*
  * Zone report arguments for block device drivers report_zones operation.
  * @cb: report_zones_cb callback for each reported zone.
diff --git a/block/blk.h b/block/blk.h
index 50abfd932886..2cc03aa54c53 100644
--- a/block/blk.h
+++ b/block/blk.h
@@ -577,6 +577,7 @@ int blkdev_report_zones_ioctl(struct block_device *bdev, unsigned int cmd,
 		unsigned long arg);
 int blkdev_zone_mgmt_ioctl(struct block_device *bdev, blk_mode_t mode,
 		unsigned int cmd, unsigned long arg);
+bool bdev_zone_mgmt_allowed(struct block_device *bdev, sector_t sector);
 #else /* CONFIG_BLK_DEV_ZONED */
 static inline void disk_init_zone_resources(struct gendisk *disk)
 {
@@ -619,6 +620,11 @@ static inline int blkdev_zone_mgmt_ioctl(struct block_device *bdev,
 {
 	return -ENOTTY;
 }
+static inline bool bdev_zone_mgmt_allowed(struct block_device *bdev,
+					  sector_t sector)
+{
+	return false;
+}
 #endif /* CONFIG_BLK_DEV_ZONED */
 
 struct block_device *bdev_alloc(struct gendisk *disk, u8 partno);
-- 
2.55.0