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Filename Latest commit message Latest commit date
Nikolay Borisov f3107a3c9b btrfs: Handle another split brain scenario with metadata uuid feature 
commit 05840710149c7d1a78ea85a2db5723f706e97d8f upstream.

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>
2020-02-11 04:35:28 -08:00
arch ARM: dma-api: fix max_pfn off-by-one error in __dma_supported() 2020-02-11 04:35:25 -08:00
block
certs
crypto crypto: pcrypt - Avoid deadlock by using per-instance padata queues 2020-02-11 04:35:28 -08:00
Documentation
drivers scsi: qla2xxx: Fix stuck login session using prli_pend_timer 2020-02-11 04:35:27 -08:00
fs btrfs: Handle another split brain scenario with metadata uuid feature 2020-02-11 04:35:28 -08:00
include crypto: pcrypt - Avoid deadlock by using per-instance padata queues 2020-02-11 04:35:28 -08:00
init
ipc
kernel crypto: pcrypt - Avoid deadlock by using per-instance padata queues 2020-02-11 04:35:28 -08:00
lib
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net
samples
scripts
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sound ASoC: SOF: core: release resources on errors in probe_continue 2020-02-11 04:35:27 -08:00
tools cpupower: Revert library ABI changes from commit ae2917093f 2020-02-11 04:35:24 -08:00
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README

README 

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.