[PATCH 04/29] drdb: Convert to use bdev_open_by_path()

Jan Kara
2023-09-27T09:34:52Z

Convert drdb to use bdev_open_by_path().

CC: drbd-dev@lists.linbit.com
Acked-by: Christoph Hellwig <hch@lst.de>
Acked-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Jan Kara <jack@suse.cz>
---
drivers/block/drbd/drbd_int.h | 2 ++
drivers/block/drbd/drbd_nl.c | 65 +++++++++++++++++------------------
2 files changed, 34 insertions(+), 33 deletions(-)

diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h
index a30a5ed811be..f017e917612b 100644
--- a/drivers/block/drbd/drbd_int.h
+++ b/drivers/block/drbd/drbd_int.h
@@ -524,7 +524,9 @@ struct drbd_md {

struct drbd_backing_dev {
struct block_device *backing_bdev;
+ struct bdev_handle *backing_bdev_handle;
struct block_device *md_bdev;
+ struct bdev_handle *md_bdev_handle;
struct drbd_md md;
struct disk_conf *disk_conf; /* RCU, for updates: resource->conf_update */
sector_t known_size; /* last known size of that backing device */
diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c
index d3538bd83fb3..43747a1aae43 100644
--- a/drivers/block/drbd/drbd_nl.c
+++ b/drivers/block/drbd/drbd_nl.c
@@ -82,7 +82,7 @@ static atomic_t notify_genl_seq = ATOMIC_INIT(2); /* two. */

DEFINE_MUTEX(notification_mutex);

-/* used blkdev_get_by_path, to claim our meta data device(s) */
+/* used bdev_open_by_path, to claim our meta data device(s) */
static char *drbd_m_holder = "Hands off! this is DRBD's meta data device.";

static void drbd_adm_send_reply(struct sk_buff *skb, struct genl_info *info)
@@ -1635,43 +1635,45 @@ int drbd_adm_disk_opts(struct sk_buff *skb, struct genl_info *info)
return 0;
}

-static struct block_device *open_backing_dev(struct drbd_device *device,
+static struct bdev_handle *open_backing_dev(struct drbd_device *device,
const char *bdev_path, void *claim_ptr, bool do_bd_link)
{
- struct block_device *bdev;
+ struct bdev_handle *handle;
int err = 0;

- bdev = blkdev_get_by_path(bdev_path, BLK_OPEN_READ | BLK_OPEN_WRITE,
- claim_ptr, NULL);
- if (IS_ERR(bdev)) {
+ handle = bdev_open_by_path(bdev_path, BLK_OPEN_READ | BLK_OPEN_WRITE,
+ claim_ptr, NULL);
+ if (IS_ERR(handle)) {
drbd_err(device, "open(\"%s\") failed with %ld\n",
- bdev_path, PTR_ERR(bdev));
- return bdev;
+ bdev_path, PTR_ERR(handle));
+ return handle;
}

if (!do_bd_link)
- return bdev;
+ return handle;

- err = bd_link_disk_holder(bdev, device->vdisk);
+ err = bd_link_disk_holder(handle->bdev, device->vdisk);
if (err) {
- blkdev_put(bdev, claim_ptr);
+ bdev_release(handle);
drbd_err(device, "bd_link_disk_holder(\"%s\", ...) failed with %d\n",
bdev_path, err);
- bdev = ERR_PTR(err);
+ handle = ERR_PTR(err);
}
- return bdev;
+ return handle;
}

static int open_backing_devices(struct drbd_device *device,
struct disk_conf *new_disk_conf,
struct drbd_backing_dev *nbc)
{
- struct block_device *bdev;
+ struct bdev_handle *handle;

- bdev = open_backing_dev(device, new_disk_conf->backing_dev, device, true);
- if (IS_ERR(bdev))
+ handle = open_backing_dev(device, new_disk_conf->backing_dev, device,
+ true);
+ if (IS_ERR(handle))
return ERR_OPEN_DISK;
- nbc->backing_bdev = bdev;
+ nbc->backing_bdev = handle->bdev;
+ nbc->backing_bdev_handle = handle;

/*
* meta_dev_idx >= 0: external fixed size, possibly multiple
@@ -1681,7 +1683,7 @@ static int open_backing_devices(struct drbd_device *device,
* should check it for you already; but if you don't, or
* someone fooled it, we need to double check here)
*/
- bdev = open_backing_dev(device, new_disk_conf->meta_dev,
+ handle = open_backing_dev(device, new_disk_conf->meta_dev,
/* claim ptr: device, if claimed exclusively; shared drbd_m_holder,
* if potentially shared with other drbd minors */
(new_disk_conf->meta_dev_idx < 0) ? (void*)device : (void*)drbd_m_holder,
@@ -1689,20 +1691,21 @@ static int open_backing_devices(struct drbd_device *device,
* as would happen with internal metadata. */
(new_disk_conf->meta_dev_idx != DRBD_MD_INDEX_FLEX_INT &&
new_disk_conf->meta_dev_idx != DRBD_MD_INDEX_INTERNAL));
- if (IS_ERR(bdev))
+ if (IS_ERR(handle))
return ERR_OPEN_MD_DISK;
- nbc->md_bdev = bdev;
+ nbc->md_bdev = handle->bdev;
+ nbc->md_bdev_handle = handle;
return NO_ERROR;
}

-static void close_backing_dev(struct drbd_device *device, struct block_device *bdev,
- void *claim_ptr, bool do_bd_unlink)
+static void close_backing_dev(struct drbd_device *device,
+ struct bdev_handle *handle, bool do_bd_unlink)
{
- if (!bdev)
+ if (!handle)
return;
if (do_bd_unlink)
- bd_unlink_disk_holder(bdev, device->vdisk);
- blkdev_put(bdev, claim_ptr);
+ bd_unlink_disk_holder(handle->bdev, device->vdisk);
+ bdev_release(handle);
}

void drbd_backing_dev_free(struct drbd_device *device, struct drbd_backing_dev *ldev)
@@ -1710,11 +1713,9 @@ void drbd_backing_dev_free(struct drbd_device *device, struct drbd_backing_dev *
if (ldev == NULL)
return;

- close_backing_dev(device, ldev->md_bdev,
- ldev->md.meta_dev_idx < 0 ?
- (void *)device : (void *)drbd_m_holder,
+ close_backing_dev(device, ldev->md_bdev_handle,
ldev->md_bdev != ldev->backing_bdev);
- close_backing_dev(device, ldev->backing_bdev, device, true);
+ close_backing_dev(device, ldev->backing_bdev_handle, true);

kfree(ldev->disk_conf);
kfree(ldev);
@@ -2130,11 +2131,9 @@ int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info)
fail:
conn_reconfig_done(connection);
if (nbc) {
- close_backing_dev(device, nbc->md_bdev,
- nbc->disk_conf->meta_dev_idx < 0 ?
- (void *)device : (void *)drbd_m_holder,
+ close_backing_dev(device, nbc->md_bdev_handle,
nbc->md_bdev != nbc->backing_bdev);
- close_backing_dev(device, nbc->backing_bdev, device, true);
+ close_backing_dev(device, nbc->backing_bdev_handle, true);
kfree(nbc);
}
kfree(new_disk_conf);
--
2.35.3