[PATCH] md: improve handing of read errors with raid6
This is a simple port of match functionality across from raid5. If we get a read error, we don't kick the drive straight away, but try to over-write with good data first. Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
parent
ca65b73bd9
commit
d69762e984
|
@ -367,8 +367,8 @@ static void shrink_stripes(raid6_conf_t *conf)
|
|||
conf->slab_cache = NULL;
|
||||
}
|
||||
|
||||
static int raid6_end_read_request (struct bio * bi, unsigned int bytes_done,
|
||||
int error)
|
||||
static int raid6_end_read_request(struct bio * bi, unsigned int bytes_done,
|
||||
int error)
|
||||
{
|
||||
struct stripe_head *sh = bi->bi_private;
|
||||
raid6_conf_t *conf = sh->raid_conf;
|
||||
|
@ -420,9 +420,35 @@ static int raid6_end_read_request (struct bio * bi, unsigned int bytes_done,
|
|||
#else
|
||||
set_bit(R5_UPTODATE, &sh->dev[i].flags);
|
||||
#endif
|
||||
if (test_bit(R5_ReadError, &sh->dev[i].flags)) {
|
||||
printk(KERN_INFO "raid6: read error corrected!!\n");
|
||||
clear_bit(R5_ReadError, &sh->dev[i].flags);
|
||||
clear_bit(R5_ReWrite, &sh->dev[i].flags);
|
||||
}
|
||||
if (atomic_read(&conf->disks[i].rdev->read_errors))
|
||||
atomic_set(&conf->disks[i].rdev->read_errors, 0);
|
||||
} else {
|
||||
md_error(conf->mddev, conf->disks[i].rdev);
|
||||
int retry = 0;
|
||||
clear_bit(R5_UPTODATE, &sh->dev[i].flags);
|
||||
atomic_inc(&conf->disks[i].rdev->read_errors);
|
||||
if (conf->mddev->degraded)
|
||||
printk(KERN_WARNING "raid6: read error not correctable.\n");
|
||||
else if (test_bit(R5_ReWrite, &sh->dev[i].flags))
|
||||
/* Oh, no!!! */
|
||||
printk(KERN_WARNING "raid6: read error NOT corrected!!\n");
|
||||
else if (atomic_read(&conf->disks[i].rdev->read_errors)
|
||||
> conf->max_nr_stripes)
|
||||
printk(KERN_WARNING
|
||||
"raid6: Too many read errors, failing device.\n");
|
||||
else
|
||||
retry = 1;
|
||||
if (retry)
|
||||
set_bit(R5_ReadError, &sh->dev[i].flags);
|
||||
else {
|
||||
clear_bit(R5_ReadError, &sh->dev[i].flags);
|
||||
clear_bit(R5_ReWrite, &sh->dev[i].flags);
|
||||
md_error(conf->mddev, conf->disks[i].rdev);
|
||||
}
|
||||
}
|
||||
rdev_dec_pending(conf->disks[i].rdev, conf->mddev);
|
||||
#if 0
|
||||
|
@ -1079,6 +1105,12 @@ static void handle_stripe(struct stripe_head *sh, struct page *tmp_page)
|
|||
if (dev->written) written++;
|
||||
rdev = conf->disks[i].rdev; /* FIXME, should I be looking rdev */
|
||||
if (!rdev || !test_bit(In_sync, &rdev->flags)) {
|
||||
/* The ReadError flag will just be confusing now */
|
||||
clear_bit(R5_ReadError, &dev->flags);
|
||||
clear_bit(R5_ReWrite, &dev->flags);
|
||||
}
|
||||
if (!rdev || !test_bit(In_sync, &rdev->flags)
|
||||
|| test_bit(R5_ReadError, &dev->flags)) {
|
||||
if ( failed < 2 )
|
||||
failed_num[failed] = i;
|
||||
failed++;
|
||||
|
@ -1095,6 +1127,14 @@ static void handle_stripe(struct stripe_head *sh, struct page *tmp_page)
|
|||
if (failed > 2 && to_read+to_write+written) {
|
||||
for (i=disks; i--; ) {
|
||||
int bitmap_end = 0;
|
||||
|
||||
if (test_bit(R5_ReadError, &sh->dev[i].flags)) {
|
||||
mdk_rdev_t *rdev = conf->disks[i].rdev;
|
||||
if (rdev && test_bit(In_sync, &rdev->flags))
|
||||
/* multiple read failures in one stripe */
|
||||
md_error(conf->mddev, rdev);
|
||||
}
|
||||
|
||||
spin_lock_irq(&conf->device_lock);
|
||||
/* fail all writes first */
|
||||
bi = sh->dev[i].towrite;
|
||||
|
@ -1130,7 +1170,8 @@ static void handle_stripe(struct stripe_head *sh, struct page *tmp_page)
|
|||
}
|
||||
|
||||
/* fail any reads if this device is non-operational */
|
||||
if (!test_bit(R5_Insync, &sh->dev[i].flags)) {
|
||||
if (!test_bit(R5_Insync, &sh->dev[i].flags) ||
|
||||
test_bit(R5_ReadError, &sh->dev[i].flags)) {
|
||||
bi = sh->dev[i].toread;
|
||||
sh->dev[i].toread = NULL;
|
||||
if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags))
|
||||
|
@ -1457,6 +1498,27 @@ static void handle_stripe(struct stripe_head *sh, struct page *tmp_page)
|
|||
clear_bit(STRIPE_SYNCING, &sh->state);
|
||||
}
|
||||
|
||||
/* If the failed drives are just a ReadError, then we might need
|
||||
* to progress the repair/check process
|
||||
*/
|
||||
if (failed <= 2 && ! conf->mddev->ro)
|
||||
for (i=0; i<failed;i++) {
|
||||
dev = &sh->dev[failed_num[i]];
|
||||
if (test_bit(R5_ReadError, &dev->flags)
|
||||
&& !test_bit(R5_LOCKED, &dev->flags)
|
||||
&& test_bit(R5_UPTODATE, &dev->flags)
|
||||
) {
|
||||
if (!test_bit(R5_ReWrite, &dev->flags)) {
|
||||
set_bit(R5_Wantwrite, &dev->flags);
|
||||
set_bit(R5_ReWrite, &dev->flags);
|
||||
set_bit(R5_LOCKED, &dev->flags);
|
||||
} else {
|
||||
/* let's read it back */
|
||||
set_bit(R5_Wantread, &dev->flags);
|
||||
set_bit(R5_LOCKED, &dev->flags);
|
||||
}
|
||||
}
|
||||
}
|
||||
spin_unlock(&sh->lock);
|
||||
|
||||
while ((bi=return_bi)) {
|
||||
|
|
Loading…
Reference in New Issue