diff options
author | NeilBrown <neilb@suse.com> | 2018-04-26 14:46:29 +1000 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-07-03 11:21:31 +0200 |
commit | 4028e39598eb12ed50702b50dde6bb83bbdf0fe3 (patch) | |
tree | cbf4693db750443b4e642b8a8607fb49a821dcf7 /drivers/mtd | |
parent | 37e875042f6c9a0880048fd7533e104b9eddf158 (diff) |
md: fix two problems with setting the "re-add" device state.
commit 011abdc9df559ec75779bb7c53a744c69b2a94c6 upstream.
If "re-add" is written to the "state" file for a device
which is faulty, this has an effect similar to removing
and re-adding the device. It should take up the
same slot in the array that it previously had, and
an accelerated (e.g. bitmap-based) rebuild should happen.
The slot that "it previously had" is determined by
rdev->saved_raid_disk.
However this is not set when a device fails (only when a device
is added), and it is cleared when resync completes.
This means that "re-add" will normally work once, but may not work a
second time.
This patch includes two fixes.
1/ when a device fails, record the ->raid_disk value in
->saved_raid_disk before clearing ->raid_disk
2/ when "re-add" is written to a device for which
->saved_raid_disk is not set, fail.
I think this is suitable for stable as it can
cause re-adding a device to be forced to do a full
resync which takes a lot longer and so puts data at
more risk.
Cc: <stable@vger.kernel.org> (v4.1)
Fixes: 97f6cd39da22 ("md-cluster: re-add capabilities")
Signed-off-by: NeilBrown <neilb@suse.com>
Reviewed-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/mtd')
0 files changed, 0 insertions, 0 deletions