md/r5cache: fix set_syndrome_sources() for data in cache
authorSong Liu <songliubraving@fb.com>
Mon, 13 Mar 2017 20:44:35 +0000 (13:44 -0700)
committerShaohua Li <shli@fb.com>
Tue, 14 Mar 2017 16:57:10 +0000 (09:57 -0700)
commit0977762f6d15f13caccc20d71a5dec47d098907d
tree77ee3009f8efac51dd90f44acb9c38a8dce127f4
parent1345921393ba23b60d3fcf15933e699232ad25ae
md/r5cache: fix set_syndrome_sources() for data in cache

Before this patch, device InJournal will be included in prexor
(SYNDROME_SRC_WANT_DRAIN) but not in reconstruct (SYNDROME_SRC_WRITTEN). So it
will break parity calculation. With srctype == SYNDROME_SRC_WRITTEN, we need
include both dev with non-null ->written and dev with R5_InJournal. This fixes
logic in 1e6d690(md/r5cache: caching phase of r5cache)

Cc: stable@vger.kernel.org (v4.10+)
Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Shaohua Li <shli@fb.com>
drivers/md/raid5.c