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md: do not compute parity unless it is on a failed drive
If a block is computed (rather than read) then a check/repair operation may be lead to believe that the data on disk is correct, when infact it isn't. So only compute blocks for failed devices. This issue has been around since at least 2.6.12, but has become harder to hit in recent kernels since most reads bypass the cache. echo repair > /sys/block/mdN/md/sync_action will set the parity blocks to the correct state. Cc: <stable@kernel.org> Signed-off-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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1 changed files with 4 additions and 1 deletions
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@ -2002,6 +2002,7 @@ static int __handle_issuing_new_read_requests5(struct stripe_head *sh,
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* have quiesced.
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*/
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if ((s->uptodate == disks - 1) &&
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(s->failed && disk_idx == s->failed_num) &&
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!test_bit(STRIPE_OP_CHECK, &sh->ops.pending)) {
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set_bit(STRIPE_OP_COMPUTE_BLK, &sh->ops.pending);
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set_bit(R5_Wantcompute, &dev->flags);
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@ -2087,7 +2088,9 @@ static void handle_issuing_new_read_requests6(struct stripe_head *sh,
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/* we would like to get this block, possibly
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* by computing it, but we might not be able to
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*/
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if (s->uptodate == disks-1) {
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if ((s->uptodate == disks - 1) &&
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(s->failed && (i == r6s->failed_num[0] ||
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i == r6s->failed_num[1]))) {
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pr_debug("Computing stripe %llu block %d\n",
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(unsigned long long)sh->sector, i);
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compute_block_1(sh, i, 0);
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