linux-kernel - [RFC v1 3/6] block: move disk invalidation from del

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Date:   Wed, 29 Apr 2020 07:48:41 +0000
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     axboe@...nel.dk, bvanassche@....org, ming.lei@...hat.com
Cc:     yukuai3@...wei.com, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, Luis Chamberlain <mcgrof@...nel.org>
Subject: [RFC v1 3/6] 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 | 85 +++++++++++++++++++++++++++------------------------
 1 file changed, 45 insertions(+), 40 deletions(-)

diff --git a/block/genhd.c b/block/genhd.c
index 091208f5f27b..b4d75a15fd31 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -718,6 +718,50 @@ static void disk_announce(struct gendisk *disk)
 	disk_part_iter_exit(&piter);
 }
 
+static void invalidate_partition(struct gendisk *disk, int partno)
+{
+	struct block_device *bdev;
+
+	bdev = bdget_disk(disk, partno);
+	if (!bdev)
+		return;
+
+	fsync_bdev(bdev);
+	__invalidate_device(bdev, true);
+
+	/*
+	 * Unhash the bdev inode for this device so that it gets evicted as soon
+	 * as last inode reference is dropped.
+	 */
+	remove_inode_hash(bdev->bd_inode);
+	bdput(bdev);
+}
+
+static void disk_invalidate(struct gendisk *disk)
+{
+	struct disk_part_iter piter;
+	struct hd_struct *part;
+
+	/*
+	 * Block lookups of the disk until all bdevs are unhashed and the
+	 * disk is marked as dead (GENHD_FL_UP cleared).
+	 */
+	down_write(&disk->lookup_sem);
+	/* invalidate stuff */
+	disk_part_iter_init(&piter, disk,
+			     DISK_PITER_INCL_EMPTY | DISK_PITER_REVERSE);
+	while ((part = disk_part_iter_next(&piter))) {
+		invalidate_partition(disk, part->partno);
+		delete_partition(disk, part);
+	}
+	disk_part_iter_exit(&piter);
+
+	invalidate_partition(disk, 0);
+	set_capacity(disk, 0);
+	disk->flags &= ~GENHD_FL_UP;
+	up_write(&disk->lookup_sem);
+}
+
 static void register_disk(struct device *parent, struct gendisk *disk,
 			  const struct attribute_group **groups)
 {
@@ -886,25 +930,6 @@ void device_add_disk_no_queue_reg(struct device *parent, struct gendisk *disk)
 }
 EXPORT_SYMBOL(device_add_disk_no_queue_reg);
 
-static void invalidate_partition(struct gendisk *disk, int partno)
-{
-	struct block_device *bdev;
-
-	bdev = bdget_disk(disk, partno);
-	if (!bdev)
-		return;
-
-	fsync_bdev(bdev);
-	__invalidate_device(bdev, true);
-
-	/*
-	 * Unhash the bdev inode for this device so that it gets evicted as soon
-	 * as last inode reference is dropped.
-	 */
-	remove_inode_hash(bdev->bd_inode);
-	bdput(bdev);
-}
-
 /**
  * del_gendisk - remove the gendisk
  * @disk: the struct gendisk to remove
@@ -926,32 +951,12 @@ static void invalidate_partition(struct gendisk *disk, int partno)
  */
 void del_gendisk(struct gendisk *disk)
 {
-	struct disk_part_iter piter;
-	struct hd_struct *part;
-
 	might_sleep();
 
 	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).
-	 */
-	down_write(&disk->lookup_sem);
-	/* invalidate stuff */
-	disk_part_iter_init(&piter, disk,
-			     DISK_PITER_INCL_EMPTY | DISK_PITER_REVERSE);
-	while ((part = disk_part_iter_next(&piter))) {
-		invalidate_partition(disk, part->partno);
-		delete_partition(disk, part);
-	}
-	disk_part_iter_exit(&piter);
-
-	invalidate_partition(disk, 0);
-	set_capacity(disk, 0);
-	disk->flags &= ~GENHD_FL_UP;
-	up_write(&disk->lookup_sem);
+	disk_invalidate(disk);
 
 	if (!(disk->flags & GENHD_FL_HIDDEN))
 		sysfs_remove_link(&disk_to_dev(disk)->kobj, "bdi");
-- 
2.25.1