[PATCH 4.19 096/115] bdev: Factor out bdev revalidation into a common helper

Greg Kroah-Hartman
2020-01-07T21:07:38Z

From: Jan Kara <jack@suse.cz>

commit 731dc4868311ee097757b8746eaa1b4f8b2b4f1c upstream.

Factor out code handling revalidation of bdev on disk change into a
common helper.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
fs/block_dev.c | 26 ++++++++++++++------------
1 file changed, 14 insertions(+), 12 deletions(-)

--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1430,6 +1430,14 @@ EXPORT_SYMBOL(bd_set_size);

static void __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part);

+static void bdev_disk_changed(struct block_device *bdev, bool invalidate)
+{
+ if (invalidate)
+ invalidate_partitions(bdev->bd_disk, bdev);
+ else
+ rescan_partitions(bdev->bd_disk, bdev);
+}
+
/*
* bd_mutex locking:
*
@@ -1512,12 +1520,9 @@ static int __blkdev_get(struct block_dev
* The latter is necessary to prevent ghost
* partitions on a removed medium.
*/
- if (bdev->bd_invalidated) {
- if (!ret)
- rescan_partitions(disk, bdev);
- else if (ret == -ENOMEDIUM)
- invalidate_partitions(disk, bdev);
- }
+ if (bdev->bd_invalidated &&
+ (!ret || ret == -ENOMEDIUM))
+ bdev_disk_changed(bdev, ret == -ENOMEDIUM);

if (ret)
goto out_clear;
@@ -1550,12 +1555,9 @@ static int __blkdev_get(struct block_dev
if (bdev->bd_disk->fops->open)
ret = bdev->bd_disk->fops->open(bdev, mode);
/* the same as first opener case, read comment there */
- if (bdev->bd_invalidated) {
- if (!ret)
- rescan_partitions(bdev->bd_disk, bdev);
- else if (ret == -ENOMEDIUM)
- invalidate_partitions(bdev->bd_disk, bdev);
- }
+ if (bdev->bd_invalidated &&
+ (!ret || ret == -ENOMEDIUM))
+ bdev_disk_changed(bdev, ret == -ENOMEDIUM);
if (ret)
goto out_unlock_bdev;
}