linux-kernel - [PATCH v1 3/8] block: move disk invalidation from del

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Message-Id: <20210512064629.13899-4-mcgrof@kernel.org>
Date:   Wed, 12 May 2021 06:46:24 +0000
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     axboe@...nel.dk
Cc:     bvanassche@....org, ming.lei@...hat.com, hch@...radead.org,
        jack@...e.cz, osandov@...com, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, Luis Chamberlain <mcgrof@...nel.org>
Subject: [PATCH v1 3/8] block: move disk invalidation from del_gendisk() into a helper

Move the disk / partition invalidation into a helper. This will make
reading del_gendisk easier to read, in preparation for adding support
to add error handling later on register_disk() and to later share more
code with del_gendisk.

This change has no functional changes.

Signed-off-by: Luis Chamberlain <mcgrof@...nel.org>
---
 block/genhd.c | 48 ++++++++++++++++++++++++++----------------------
 1 file changed, 26 insertions(+), 22 deletions(-)

diff --git a/block/genhd.c b/block/genhd.c
index 484cda981b4e..40a34981f9e2 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -438,6 +438,31 @@ static void disk_announce(struct gendisk *disk)
 	disk_uevent(disk, KOBJ_ADD);
 }
 
+static void disk_invalidate(struct gendisk *disk)
+{
+	if (!(disk->flags & GENHD_FL_HIDDEN)) {
+		sysfs_remove_link(&disk_to_dev(disk)->kobj, "bdi");
+
+		/*
+		 * Unregister bdi before releasing device numbers (as they can
+		 * get reused and we'd get clashes in sysfs).
+		 */
+		bdi_unregister(disk->queue->backing_dev_info);
+	}
+
+	blk_unregister_queue(disk);
+
+	kobject_put(disk->part0->bd_holder_dir);
+	kobject_put(disk->slave_dir);
+
+	part_stat_set_all(disk->part0, 0);
+	disk->part0->bd_stamp = 0;
+	if (!sysfs_deprecated)
+		sysfs_remove_link(block_depr, dev_name(disk_to_dev(disk)));
+	pm_runtime_set_memalloc_noio(disk_to_dev(disk), false);
+	device_del(disk_to_dev(disk));
+}
+
 static void register_disk(struct device *parent, struct gendisk *disk,
 			  const struct attribute_group **groups)
 {
@@ -614,7 +639,6 @@ void del_gendisk(struct gendisk *disk)
 
 	blk_integrity_del(disk);
 	disk_del_events(disk);
-
 	/*
 	 * Block lookups of the disk until all bdevs are unhashed and the
 	 * disk is marked as dead (GENHD_FL_UP cleared).
@@ -638,27 +662,7 @@ void del_gendisk(struct gendisk *disk)
 	disk->flags &= ~GENHD_FL_UP;
 	up_write(&bdev_lookup_sem);
 
-	if (!(disk->flags & GENHD_FL_HIDDEN)) {
-		sysfs_remove_link(&disk_to_dev(disk)->kobj, "bdi");
-
-		/*
-		 * Unregister bdi before releasing device numbers (as they can
-		 * get reused and we'd get clashes in sysfs).
-		 */
-		bdi_unregister(disk->queue->backing_dev_info);
-	}
-
-	blk_unregister_queue(disk);
-
-	kobject_put(disk->part0->bd_holder_dir);
-	kobject_put(disk->slave_dir);
-
-	part_stat_set_all(disk->part0, 0);
-	disk->part0->bd_stamp = 0;
-	if (!sysfs_deprecated)
-		sysfs_remove_link(block_depr, dev_name(disk_to_dev(disk)));
-	pm_runtime_set_memalloc_noio(disk_to_dev(disk), false);
-	device_del(disk_to_dev(disk));
+	disk_invalidate(disk);
 }
 EXPORT_SYMBOL(del_gendisk);
 
-- 
2.30.2