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commit0584071014upstream. There is one more cases which isn't handled by the original metadata uuid work. Namely, when a filesystem has METADATA_UUID incompat bit and the user decides to change the FSID to the original one e.g. have metadata_uuid and fsid match. In case of power failure while this operation is in progress we could end up in a situation where some of the disks have the incompat bit removed and the other half have both METADATA_UUID_INCOMPAT and FSID_CHANGING_IN_PROGRESS flags. This patch handles the case where a disk that has successfully changed its FSID such that it equals METADATA_UUID is scanned first. Subsequently when a disk with both METADATA_UUID_INCOMPAT/FSID_CHANGING_IN_PROGRESS flags is scanned find_fsid_changed won't be able to find an appropriate btrfs_fs_devices. This is done by extending find_fsid_changed to correctly find btrfs_fs_devices whose metadata_uuid/fsid are the same and they match the metadata_uuid of the currently scanned device. Fixes:cc5de4e702("btrfs: Handle final split-brain possibility during fsid change") Reviewed-by: Josef Bacik <josef@toxicpanda.com> Reported-by: Su Yue <Damenly_Su@gmx.com> Signed-off-by: Nikolay Borisov <nborisov@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.