Re: [PATCH RFC 4/8] xfs: port to fs_bdev_file_open_by_path()

[Christoph Hellwig]

This causes regressions in xfstests xfs/006 xfs/264 when running with
a RT device because reopening the dm substitutef RT device returns
-EBUSY:

[   20.814542] XFS (dm-0): log I/O error -5
[   20.815055] XFS (dm-0): Filesystem has been shut down due to log error (0x2).
[   20.815960] XFS (dm-0): Please unmount the filesystem and rectify the problem(s).
[   20.906440] device-mapper: zone: dm-1 using native zone append
[   20.954262] XFS (dm-0): Invalid device [/dev/mapper/error-rttest.264], error=-16
[   20.970876] XFS (dm-0): Invalid device [/dev/mapper/error-rttest.264], error=-16

I'm also a bit surprised a RFC patch without any xfs rviews landed in
Linus tree, especially as the series alsso got various NAKs..