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md/raid5: use bad-block log to improve handling of uncorrectable read errors.

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If we get an uncorrectable read error - record a bad block rather than
failing the device.
And if these errors (which may be due to known bad blocks) cause
recovery to be impossible, record a bad block on the recovering
devices, or abort the recovery.

As we might abort a recovery without failing a device we need to teach
RAID5 about recovery_disabled handling.

Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown
2011-07-28 11:39:22 +10:00
parent 31c176ecdf
commit 7f0da59bdc
2 changed files with 53 additions and 8 deletions
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2
drivers/md/raid5.h
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@@ -399,7 +399,7 @@ struct raid5_private_data {
* (fresh device added).
* Cleared when a sync completes.
*/
int recovery_disabled;
/* per cpu variables */
struct raid5_percpu {
struct page *spare_page; /* Used when checking P/Q in raid6 */