[PATCH v8 02/12] block: refactor blk_revalidate_disk_zones()

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

Split out most of the code of blk_revalidate_disk_zones() into the
internal function disk_revalidate_zones(). This will allow calling this
new helper together with other code under the zone revalidation mutex.
No functional change.

Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <mkp@kernel.org>
Reviewed-by: Hannes Reinecke <hare@kernel.org>
---
 block/blk-zoned.c | 63 +++++++++++++++++++++++++----------------------
 1 file changed, 34 insertions(+), 29 deletions(-)

diff --git a/block/blk-zoned.c b/block/blk-zoned.c
index 07d504287024..600d6bd008ae 100644
--- a/block/blk-zoned.c
+++ b/block/blk-zoned.c
@@ -2552,20 +2552,7 @@ static int blk_revalidate_zone_cb(struct blk_zone *zone, unsigned int idx,
 	return ret;
 }
 
-/**
- * blk_revalidate_disk_zones - (re)allocate and initialize zone write plugs
- * @disk:	Target disk
- *
- * Helper function for low-level device drivers to check, (re) allocate and
- * initialize resources used for managing zoned disks. This function should
- * normally be called by blk-mq based drivers when a zoned gendisk is probed
- * and when the zone configuration of the gendisk changes (e.g. after a format).
- * Before calling this function, the device driver must already have set the
- * device zone size (chunk_sector limit) and the max zone append limit.
- * BIO based drivers can also use this function as long as the device queue
- * can be safely frozen.
- */
-int blk_revalidate_disk_zones(struct gendisk *disk)
+static int disk_revalidate_zones(struct gendisk *disk)
 {
 	struct blk_revalidate_zone_args args = { };
 	struct blk_report_zones_args rep_args = {
@@ -2576,19 +2563,10 @@ int blk_revalidate_disk_zones(struct gendisk *disk)
 	int retries = 2;
 	int ret;
 
-	if (WARN_ON_ONCE(!blk_queue_is_zoned(disk->queue)))
-		return -EIO;
-
-	/*
-	 * Serialize calls to this function so that we can safely look at and
-	 * eventually change the disk zone information.
-	 */
-	mutex_lock(&disk->zone_revalidate_mutex);
-
 again:
 	ret = disk_revalidate_capacity(disk, &args);
 	if (ret)
-		goto unlock;
+		return ret;
 
 	/*
 	 * Allocate zone resources if they are needed and we have not done
@@ -2601,14 +2579,14 @@ int blk_revalidate_disk_zones(struct gendisk *disk)
 		ret = disk_alloc_zone_resources(disk, args.capacity);
 		if (ret) {
 			memalloc_noio_restore(noio_flag);
-			goto unlock;
+			return ret;
 		}
 	}
 
 	ret = disk_init_revalidate_args(disk, &args);
 	if (ret) {
 		memalloc_noio_restore(noio_flag);
-		goto unlock;
+		return ret;
 	}
 
 	ret = disk->fops->report_zones(disk, 0, UINT_MAX, &rep_args);
@@ -2625,8 +2603,6 @@ int blk_revalidate_disk_zones(struct gendisk *disk)
 	if (ret)
 		goto free_args;
 
-	mutex_unlock(&disk->zone_revalidate_mutex);
-
 	return 0;
 
 free_args:
@@ -2642,7 +2618,36 @@ int blk_revalidate_disk_zones(struct gendisk *disk)
 	}
 
 	pr_warn("%s: failed to revalidate zones\n", disk->disk_name);
-unlock:
+
+	return ret;
+}
+
+/**
+ * blk_revalidate_disk_zones - (re)allocate and initialize zone write plugs
+ * @disk:	Target disk
+ *
+ * Helper function for low-level device drivers to check, (re) allocate and
+ * initialize resources used for managing zoned disks. This function should
+ * normally be called by blk-mq based drivers when a zoned gendisk is probed
+ * and when the zone configuration of the gendisk changes (e.g. after a format).
+ * Before calling this function, the device driver must already have set the
+ * device zone size (chunk_sector limit) and the max zone append limit.
+ * BIO based drivers can also use this function as long as the device queue
+ * can be safely frozen.
+ */
+int blk_revalidate_disk_zones(struct gendisk *disk)
+{
+	int ret;
+
+	if (WARN_ON_ONCE(!blk_queue_is_zoned(disk->queue)))
+		return -EIO;
+
+	/*
+	 * Serialize calls to this function so that we can safely look at and
+	 * eventually change the disk zone information.
+	 */
+	mutex_lock(&disk->zone_revalidate_mutex);
+	ret = disk_revalidate_zones(disk);
 	mutex_unlock(&disk->zone_revalidate_mutex);
 
 	return ret;
-- 
2.56.0