Deduplicate the helpers to open a device node by passing a name
prefix argument and using the same helper for both kinds of paths.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
fs/nfs/blocklayout/dev.c | 42 +++++++++++-----------------------------
1 file changed, 11 insertions(+), 31 deletions(-)
diff --git a/fs/nfs/blocklayout/dev.c b/fs/nfs/blocklayout/dev.c
index 5e56da748b2ab..fea5f8821da5e 100644
--- a/fs/nfs/blocklayout/dev.c
+++ b/fs/nfs/blocklayout/dev.c
@@ -301,18 +301,14 @@ bl_validate_designator(struct pnfs_block_volume *v)
}
}
-/*
- * Try to open the udev path for the WWN. At least on Debian the udev
- * by-id path will always point to the dm-multipath device if one exists.
- */
static struct block_device *
-bl_open_udev_path(struct pnfs_block_volume *v)
+bl_open_path(struct pnfs_block_volume *v, const char *prefix)
{
struct block_device *bdev;
const char *devname;
- devname = kasprintf(GFP_KERNEL, "/dev/disk/by-id/wwn-0x%*phN",
- v->scsi.designator_len, v->scsi.designator);
+ devname = kasprintf(GFP_KERNEL, "/dev/disk/by-id/%s%*phN",
+ prefix, v->scsi.designator_len, v->scsi.designator);
if (!devname)
return ERR_PTR(-ENOMEM);
@@ -326,28 +322,6 @@ bl_open_udev_path(struct pnfs_block_volume *v)
return bdev;
}
-/*
- * Try to open the RH/Fedora specific dm-mpath udev path for this WWN, as the
- * wwn- links will only point to the first discovered SCSI device there.
- */
-static struct block_device *
-bl_open_dm_mpath_udev_path(struct pnfs_block_volume *v)
-{
- struct block_device *bdev;
- const char *devname;
-
- devname = kasprintf(GFP_KERNEL,
- "/dev/disk/by-id/dm-uuid-mpath-%d%*phN",
- v->scsi.designator_type,
- v->scsi.designator_len, v->scsi.designator);
- if (!devname)
- return ERR_PTR(-ENOMEM);
-
- bdev = blkdev_get_by_path(devname, FMODE_READ | FMODE_WRITE, NULL);
- kfree(devname);
- return bdev;
-}
-
static int
bl_parse_scsi(struct nfs_server *server, struct pnfs_block_dev *d,
struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask)
@@ -360,9 +334,15 @@ bl_parse_scsi(struct nfs_server *server, struct pnfs_block_dev *d,
if (!bl_validate_designator(v))
return -EINVAL;
- bdev = bl_open_dm_mpath_udev_path(v);
+ /*
+ * Try to open the RH/Fedora specific dm-mpath udev path first, as the
+ * wwn- links will only point to the first discovered SCSI device there.
+ * On other distributions like Debian, the default SCSI by-id path will
+ * point to the dm-multipath device if one exists.
+ */
+ bdev = bl_open_path(v, "dm-uuid-mpath-0x");
if (IS_ERR(bdev))
- bdev = bl_open_udev_path(v);
+ bdev = bl_open_path(v, "wwn-0x");
if (IS_ERR(bdev))
return PTR_ERR(bdev);
d->bdev = bdev;
--
2.30.2
