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md: don't fail an array if there are unacknowledged bad blocks
If external metadata handler supports bad blocks and unacknowledged bad blocks are present, don't report disk via sysfs as faulty. Such situation can be still handled so disk just has to be blocked for a moment. It makes it consistent with kernel state as corresponding rdev flag is also not set. When the disk in being unblocked there are few cases: 1. Disk has been in blocked and faulty state, it is being unblocked but it still remains in faulty state. Metadata handler will remove it from array in the next call. 2. There is no bad block support in external metadata handler and bad blocks are present - put the disk in blocked and faulty state (see case 1). 3. There is bad block support in external metadata handler and all bad blocks are acknowledged - clear all flags, continue. 4. There is bad block support in external metadata handler but there are still unacknowledged bad blocks - clear all flags, continue. It is fine to clear Blocked flag because it was probably not set anyway (if it was it is case 1). BlockedBadBlocks flag can also be cleared because the request waiting for it will set it again when it finds out that some bad block is still not acknowledged. Recovery is not necessary but there are no problems if the flag is set. Sysfs rdev state is still reported as blocked (due to unacknowledged bad blocks) so metadata handler will process remaining bad blocks and unblock disk again. Signed-off-by: Tomasz Majchrzak <tomasz.majchrzak@intel.com> Signed-off-by: Shaohua Li <shli@fb.com>
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@ -2528,7 +2528,8 @@ state_show(struct md_rdev *rdev, char *page)
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unsigned long flags = ACCESS_ONCE(rdev->flags);
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if (test_bit(Faulty, &flags) ||
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rdev->badblocks.unacked_exist)
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(!test_bit(ExternalBbl, &flags) &&
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rdev->badblocks.unacked_exist))
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len += sprintf(page+len, "faulty%s", sep);
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if (test_bit(In_sync, &flags))
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len += sprintf(page+len, "in_sync%s", sep);
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@ -2613,6 +2614,7 @@ state_store(struct md_rdev *rdev, const char *buf, size_t len)
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err = 0;
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} else if (cmd_match(buf, "-blocked")) {
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if (!test_bit(Faulty, &rdev->flags) &&
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!test_bit(ExternalBbl, &rdev->flags) &&
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rdev->badblocks.unacked_exist) {
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/* metadata handler doesn't understand badblocks,
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* so we need to fail the device
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