If we succeed in writing to a block that was recorded as
being bad, we clear the bad-block record.
This requires some delayed handling as the bad-block-list update has
to happen in process-context.
Signed-off-by: NeilBrown <neilb@xxxxxxx>
---
drivers/md/raid1.c | 58 ++++++++++++++++++++++++++++++++++++++++++++++------
drivers/md/raid1.h | 13 +++++++++++-
2 files changed, 63 insertions(+), 8 deletions(-)
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index d240d58..e23ec40 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -175,7 +175,7 @@ static void put_all_bios(conf_t *conf, r1bio_t *r1_bio)
for (i = 0; i < conf->raid_disks; i++) {
struct bio **bio = r1_bio->bios + i;
- if (*bio && *bio != IO_BLOCKED)
+ if (!BIO_SPECIAL(*bio))
bio_put(*bio);
*bio = NULL;
}
@@ -348,7 +348,7 @@ static void raid1_end_write_request(struct bio *bio, int error)
md_error(r1_bio->mddev, conf->mirrors[mirror].rdev);
/* an I/O failed, we can't clear the bitmap */
set_bit(R1BIO_Degraded, &r1_bio->state);
- } else
+ } else {
/*
* Set R1BIO_Uptodate in our master bio, so that
* we will return a good error code for to the higher
@@ -360,6 +360,15 @@ static void raid1_end_write_request(struct bio *bio, int error)
*/
set_bit(R1BIO_Uptodate, &r1_bio->state);
+ /* Maybe we can clear some bad blocks. */
+ if (is_badblock(conf->mirrors[mirror].rdev,
+ r1_bio->sector, r1_bio->sectors,
+ NULL, NULL)) {
+ r1_bio->bios[mirror] = IO_MADE_GOOD;
+ set_bit(R1BIO_MadeGood, &r1_bio->state);
+ }
+ }
+
update_head_pos(mirror, r1_bio);
if (behind) {
@@ -384,7 +393,9 @@ static void raid1_end_write_request(struct bio *bio, int error)
}
}
}
- rdev_dec_pending(conf->mirrors[mirror].rdev, conf->mddev);
+ if (r1_bio->bios[mirror] == NULL)
+ rdev_dec_pending(conf->mirrors[mirror].rdev,
+ conf->mddev);
}
/*
*
@@ -408,7 +419,10 @@ static void raid1_end_write_request(struct bio *bio, int error)
!test_bit(R1BIO_Degraded, &r1_bio->state),
behind);
md_write_end(r1_bio->mddev);
- raid_end_bio_io(r1_bio);
+ if (test_bit(R1BIO_MadeGood, &r1_bio->state))
+ reschedule_retry(r1_bio);
+ else
+ raid_end_bio_io(r1_bio);
}
}
@@ -1451,7 +1465,11 @@ static void end_sync_write(struct bio *bio, int error)
sectors_to_go -= sync_blocks;
} while (sectors_to_go > 0);
md_error(mddev, conf->mirrors[mirror].rdev);
- }
+ } else if (is_badblock(conf->mirrors[mirror].rdev,
+ r1_bio->sector,
+ r1_bio->sectors,
+ NULL, NULL))
+ set_bit(R1BIO_MadeGood, &r1_bio->state);
update_head_pos(mirror, r1_bio);
@@ -1812,8 +1830,34 @@ static void raid1d(mddev_t *mddev)
mddev = r1_bio->mddev;
conf = mddev->private;
if (test_bit(R1BIO_IsSync, &r1_bio->state)) {
- sync_request_write(mddev, r1_bio);
- unplug = 1;
+ if (test_bit(R1BIO_MadeGood, &r1_bio->state)) {
+ int m;
+ for (m = 0; m < conf->raid_disks ; m++)
+ if (!BIO_SPECIAL(r1_bio->bios[m]) &&
+ test_bit(BIO_UPTODATE,
+ &r1_bio->bios[m]->bi_flags)) {
+ md_clear_badblocks(
+ &conf->mirrors[m].rdev->badblocks,
+ r1_bio->sector,
+ r1_bio->sectors);
+ }
+ put_buf(r1_bio);
+ } else {
+ sync_request_write(mddev, r1_bio);
+ unplug = 1;
+ }
+ } else if (test_bit(R1BIO_MadeGood, &r1_bio->state)) {
+ int m;
+ for (m = 0; m < conf->raid_disks ; m++)
+ if (r1_bio->bios[m] == IO_MADE_GOOD) {
+ md_clear_badblocks(
+ &conf->mirrors[m].rdev->badblocks,
+ r1_bio->sector,
+ r1_bio->sectors);
+ rdev_dec_pending(conf->mirrors[m].rdev,
+ mddev);
+ }
+ raid_end_bio_io(r1_bio);
} else if (test_bit(R1BIO_BarrierRetry, &r1_bio->state)) {
/* some requests in the r1bio were BIO_RW_BARRIER
* requests which failed with -EOPNOTSUPP. Hohumm..
diff --git a/drivers/md/raid1.h b/drivers/md/raid1.h
index 5f2d443..c91c736 100644
--- a/drivers/md/raid1.h
+++ b/drivers/md/raid1.h
@@ -110,7 +110,14 @@ struct r1bio_s {
* correct the read error. To keep track of bad blocks on a per-bio
* level, we store IO_BLOCKED in the appropriate 'bios' pointer
*/
-#define IO_BLOCKED ((struct bio*)1)
+#define IO_BLOCKED ((struct bio *)1)
+/* When we successfully write to a known bad-block, we need to remove the
+ * bad-block marking which must be done from process context. So we record
+ * the success by setting bios[n] to IO_MADE_GOOD
+ */
+#define IO_MADE_GOOD ((struct bio *)2)
+
+#define BIO_SPECIAL(bio) ((unsigned long)bio <= 2)
/* bits for r1bio.state */
#define R1BIO_Uptodate 0
@@ -127,5 +134,9 @@ struct r1bio_s {
* Record that bi_end_io was called with this flag...
*/
#define R1BIO_Returned 6
+/* If a write for this request means we can clear some
+ * known-bad-block records, we set this flag
+ */
+#define R1BIO_MadeGood 7
#endif
--
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