[PATCH 11/29] md: Convert to bdev_open_by_dev()

Jan Kara
2023-09-27T09:35:07Z

Convert md to use bdev_open_by_dev() and pass the handle around. We also
don't need the 'Holder' flag anymore so remove it.

CC: linux-raid@vger.kernel.org
CC: Song Liu <song@kernel.org>
Acked-by: Song Liu <song@kernel.org>
Acked-by: Christoph Hellwig <hch@lst.de>
Acked-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Jan Kara <jack@suse.cz>
---
drivers/md/md.c | 22 ++++++++--------------
drivers/md/md.h | 4 +---
2 files changed, 9 insertions(+), 17 deletions(-)

diff --git a/drivers/md/md.c b/drivers/md/md.c
index a104a025084d..5ed8cad3f4fa 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -2452,8 +2452,7 @@ static void export_rdev(struct md_rdev *rdev, struct mddev *mddev)
if (test_bit(AutoDetected, &rdev->flags))
md_autodetect_dev(rdev->bdev->bd_dev);
#endif
- blkdev_put(rdev->bdev,
- test_bit(Holder, &rdev->flags) ? rdev : &claim_rdev);
+ bdev_release(rdev->bdev_handle);
rdev->bdev = NULL;
kobject_put(&rdev->kobj);
}
@@ -3648,21 +3647,16 @@ static struct md_rdev *md_import_device(dev_t newdev, int super_format, int supe
if (err)
goto out_clear_rdev;

- if (super_format == -2) {
- holder = &claim_rdev;
- } else {
- holder = rdev;
- set_bit(Holder, &rdev->flags);
- }
-
- rdev->bdev = blkdev_get_by_dev(newdev, BLK_OPEN_READ | BLK_OPEN_WRITE,
- holder, NULL);
- if (IS_ERR(rdev->bdev)) {
+ rdev->bdev_handle = bdev_open_by_dev(newdev,
+ BLK_OPEN_READ | BLK_OPEN_WRITE,
+ super_format == -2 ? &claim_rdev : rdev, NULL);
+ if (IS_ERR(rdev->bdev_handle)) {
pr_warn("md: could not open device unknown-block(%u,%u).\n",
MAJOR(newdev), MINOR(newdev));
- err = PTR_ERR(rdev->bdev);
+ err = PTR_ERR(rdev->bdev_handle);
goto out_clear_rdev;
}
+ rdev->bdev = rdev->bdev_handle->bdev;

kobject_init(&rdev->kobj, &rdev_ktype);

@@ -3693,7 +3687,7 @@ static struct md_rdev *md_import_device(dev_t newdev, int super_format, int supe
return rdev;

out_blkdev_put:
- blkdev_put(rdev->bdev, holder);
+ bdev_release(rdev->bdev_handle);
out_clear_rdev:
md_rdev_clear(rdev);
out_free_rdev:
diff --git a/drivers/md/md.h b/drivers/md/md.h
index 7c9c13abd7ca..274e7d61d19f 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -59,6 +59,7 @@ struct md_rdev {
*/
struct block_device *meta_bdev;
struct block_device *bdev; /* block device handle */
+ struct bdev_handle *bdev_handle; /* Handle from open for bdev */

struct page *sb_page, *bb_page;
int sb_loaded;
@@ -211,9 +212,6 @@ enum flag_bits {
* check if there is collision between raid1
* serial bios.
*/
- Holder, /* rdev is used as holder while opening
- * underlying disk exclusively.
- */
};

static inline int is_badblock(struct md_rdev *rdev, sector_t s, int sectors,
--
2.35.3