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b471965fdb
Fstests with POST_MKFS_CMD="btrfstune -m" (as in the mailing list)
reported a few of the test cases failing.
The failure scenario can be summarized and simplified as follows:
$ mkfs.btrfs -fq -draid1 -mraid1 /dev/sdb1 /dev/sdb2 :0
$ btrfstune -m /dev/sdb1 :0
$ wipefs -a /dev/sdb1 :0
$ mount -o degraded /dev/sdb2 /btrfs :0
$ btrfs replace start -B -f -r 1 /dev/sdb1 /btrfs :1
STDERR:
ERROR: ioctl(DEV_REPLACE_START) failed on "/btrfs": Input/output error
[11290.583502] BTRFS warning (device sdb2): tree block 22036480 mirror 2 has bad fsid, has 99835c32-49f0-4668-9e66-dc277a96b4a6 want da40350c-33ac-4872-92a8-4948ed8c04d0
[11290.586580] BTRFS error (device sdb2): unable to fix up (regular) error at logical 22020096 on dev /dev/sdb8 physical 1048576
As above, the replace is failing because we are verifying the header with
fs_devices::fsid instead of fs_devices::metadata_uuid, despite the
metadata_uuid actually being present.
To fix this, use fs_devices::metadata_uuid. We copy fsid into
fs_devices::metadata_uuid if there is no metadata_uuid, so its fine.
Fixes:
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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.