diff options
| author | Xiao Ni <xni@redhat.com> | 2019-07-08 05:14:32 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-10-05 13:48:10 +0300 |
| commit | 3ee752aff6915d2f587a4d1e6ea7e9867b59f910 (patch) | |
| tree | 9ae8c3e8749f51346f17bd59009f6399a4c6ef19 /drivers/md | |
| parent | db04b74e009573f3eb715076984cee67b5d3d342 (diff) | |
| download | linux-3ee752aff6915d2f587a4d1e6ea7e9867b59f910.tar.xz | |
md/raid6: Set R5_ReadError when there is read failure on parity disk
commit 143f6e733b73051cd22dcb80951c6c929da413ce upstream.
7471fb77ce4d ("md/raid6: Fix anomily when recovering a single device in
RAID6.") avoids rereading P when it can be computed from other members.
However, this misses the chance to re-write the right data to P. This
patch sets R5_ReadError if the re-read fails.
Also, when re-read is skipped, we also missed the chance to reset
rdev->read_errors to 0. It can fail the disk when there are many read
errors on P member disk (other disks don't have read error)
V2: upper layer read request don't read parity/Q data. So there is no
need to consider such situation.
This is Reported-by: kbuild test robot <lkp@intel.com>
Fixes: 7471fb77ce4d ("md/raid6: Fix anomily when recovering a single device in RAID6.")
Cc: <stable@vger.kernel.org> #4.4+
Signed-off-by: Xiao Ni <xni@redhat.com>
Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/raid5.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 9f2059e185f7..4c49bed40f1f 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -2571,7 +2571,9 @@ static void raid5_end_read_request(struct bio * bi) && !test_bit(R5_ReadNoMerge, &sh->dev[i].flags)) retry = 1; if (retry) - if (test_bit(R5_ReadNoMerge, &sh->dev[i].flags)) { + if (sh->qd_idx >= 0 && sh->pd_idx == i) + set_bit(R5_ReadError, &sh->dev[i].flags); + else if (test_bit(R5_ReadNoMerge, &sh->dev[i].flags)) { set_bit(R5_ReadError, &sh->dev[i].flags); clear_bit(R5_ReadNoMerge, &sh->dev[i].flags); } else |