md/raid5: Fix Force reconstruct-write io stuck in degraded raid5
In degraded raid5, we need to read parity to do reconstruct-write when data disks fail. However, we can not read parity from handle_stripe_dirtying() in force reconstruct-write mode. Reproducible Steps: 1. Create degraded raid5 mdadm -C /dev/md2 --assume-clean -l5 -n3 /dev/sda2 /dev/sdb2 missing 2. Set rmw_level to 0 echo 0 > /sys/block/md2/md/rmw_level 3. IO to raid5 Now some io may be stuck in raid5. We can use handle_stripe_fill() to read the parity in this situation. Cc: <stable@vger.kernel.org> # v4.4+ Reviewed-by:Alex Wu <alexwu@synology.com> Reviewed-by:
BingJing Chang <bingjingc@synology.com> Reviewed-by:
Danny Shih <dannyshih@synology.com> Signed-off-by:
ChangSyun Peng <allenpeng@synology.com> Signed-off-by:
Song Liu <songliubraving@fb.com>
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