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authorXiao Ni <xni@redhat.com>2021-04-25 17:22:57 +0800
committerSong Liu <song@kernel.org>2021-04-26 10:06:12 -0700
commitceaf2966ab082bbc4d26516f97b3ca8a676e2af8 (patch)
treed6d9b27500458ee50e6962b4f90341ecc921ae21 /crypto
parent72ce11ddfa4e9e1879103581a60b7e34547eaa0a (diff)
async_xor: increase src_offs when dropping destination page
Now we support sharing one page if PAGE_SIZE is not equal stripe size. To support this, it needs to support calculating xor value with different offsets for each r5dev. One offset array is used to record those offsets. In RMW mode, parity page is used as a source page. It sets ASYNC_TX_XOR_DROP_DST before calculating xor value in ops_run_prexor5. So it needs to add src_list and src_offs at the same time. Now it only needs src_list. So the xor value which is calculated is wrong. It can cause data corruption problem. I can reproduce this problem 100% on a POWER8 machine. The steps are: mdadm -CR /dev/md0 -l5 -n3 /dev/sdb1 /dev/sdc1 /dev/sdd1 --size=3G mkfs.xfs /dev/md0 mount /dev/md0 /mnt/test mount: /mnt/test: mount(2) system call failed: Structure needs cleaning. Fixes: 29bcff787a25 ("md/raid5: add new xor function to support different page offset") Cc: stable@vger.kernel.org # v5.10+ Signed-off-by: Xiao Ni <xni@redhat.com> Signed-off-by: Song Liu <song@kernel.org>
Diffstat (limited to 'crypto')
-rw-r--r--crypto/async_tx/async_xor.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/crypto/async_tx/async_xor.c b/crypto/async_tx/async_xor.c
index a057ecb1288d..6cd7f7025df4 100644
--- a/crypto/async_tx/async_xor.c
+++ b/crypto/async_tx/async_xor.c
@@ -233,6 +233,7 @@ async_xor_offs(struct page *dest, unsigned int offset,
if (submit->flags & ASYNC_TX_XOR_DROP_DST) {
src_cnt--;
src_list++;
+ src_offs++;
}
/* wait for any prerequisite operations */

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