Boris managed to create a device capable of changing its maj:min without altering its device path. Only multi-devices can be scanned. A device that gets scanned and remains in the btrfs kernel cache might end up with an incorrect maj:min. Despite the temp-fsid feature patch did not introduce this bug, it could lead to issues if the above multi-device is converted to a single device with a stale maj:min. Subsequently, attempting to mount the same device with the correct maj:min might mistake it for another device with the same fsid, potentially resulting in wrongly auto-enabling the temp-fsid feature. To address this, this patch validates the device's maj:min at the time of device open and updates it if it has changed since the last scan. CC: stable@vger.kernel.org # 6.7+ Fixes: a5b8a5f9f835 ("btrfs: support cloned-device mount capability") Reported-by: Boris Burkov <boris@bur.io> Co-developed-by: Boris Burkov <boris@bur.io> Reviewed-by: Boris Burkov <boris@bur.io># Signed-off-by: Anand Jain <anand.jain@oracle.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
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.
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