md/raid5-cache: clear MD_SB_CHANGE_PENDING before flushing stripes
In recovery, if we process too much data, raid5-cache may set MD_SB_CHANGE_PENDING, which causes spinning in handle_stripe(). Fix this issue by clearing the bit before flushing data only stripes. This issue was initially discussed in [1]. [1] https://www.spinics.net/lists/raid/msg64409.htmlSigned-off-by: Song Liu <songliubraving@fb.com>
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