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nfs/blocklayout: support RH/Fedora dm-mpath device nodes

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Instead of reusing the wwn-* names for multipath devices nodes RHEL and
Fedora introduce new dm-mpath-uuid-* nodes with a slightly different
naming scheme.  Try these names first to ensure we always get a
multipath-capable device if it exists.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Christoph Hellwig 2016-07-08 18:41:30 +09:00 committed by Trond Myklebust
parent d702d41ed4
commit 11487ddbdb
1 changed files with 25 additions and 1 deletions
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26
fs/nfs/blocklayout/dev.c
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@ -312,6 +312,28 @@ 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)
@ -323,7 +345,9 @@ bl_parse_scsi(struct nfs_server *server, struct pnfs_block_dev *d,
if (!bl_validate_designator(v))
return -EINVAL;
d->bdev = bl_open_udev_path(v);
d->bdev = bl_open_dm_mpath_udev_path(v);
if (IS_ERR(d->bdev))
d->bdev = bl_open_udev_path(v);
if (IS_ERR(d->bdev))
return PTR_ERR(d->bdev);