The RAID6 version of this code is usable for RAID5 providing:
- we test "conf->max_degraded" rather than "2" as appropriate
- we make sure s->failed_num[1] is meaningful (and not '-1')
when s->failed > 1
The 'return 1' must become 'goto finish' in the new location.
Signed-off-by: NeilBrown <neilb@xxxxxxx>
---
drivers/md/raid5.c | 178 +++++++++++++++++++---------------------------------
1 files changed, 66 insertions(+), 112 deletions(-)
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index ba6f892..f23848f 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -2969,63 +2969,14 @@ static int handle_stripe5(struct stripe_head *sh, struct stripe_head_state *s)
if (test_bit(R5_ReadError, &dev->flags))
clear_bit(R5_Insync, &dev->flags);
if (!test_bit(R5_Insync, &dev->flags)) {
+ if (s->failed < 2)
+ s->failed_num[s->failed] = i;
s->failed++;
- s->failed_num[0] = i;
}
}
spin_unlock_irq(&conf->device_lock);
rcu_read_unlock();
- if (unlikely(s->blocked_rdev)) {
- if (s->syncing || s->expanding || s->expanded ||
- s->to_write || s->written) {
- set_bit(STRIPE_HANDLE, &sh->state);
- return 1;
- }
- /* There is nothing for the blocked_rdev to block */
- rdev_dec_pending(s->blocked_rdev, conf->mddev);
- s->blocked_rdev = NULL;
- }
-
- if (s->to_fill && !test_bit(STRIPE_BIOFILL_RUN, &sh->state)) {
- set_bit(STRIPE_OP_BIOFILL, &s->ops_request);
- set_bit(STRIPE_BIOFILL_RUN, &sh->state);
- }
-
- pr_debug("locked=%d uptodate=%d to_read=%d"
- " to_write=%d failed=%d failed_num=%d\n",
- s->locked, s->uptodate, s->to_read, s->to_write,
- s->failed, s->failed_num[0]);
- /* check if the array has lost two devices and, if so, some requests might
- * need to be failed
- */
- if (s->failed > 1 && s->to_read+s->to_write+s->written)
- handle_failed_stripe(conf, sh, s, disks, &s->return_bi);
- if (s->failed > 1 && s->syncing) {
- md_done_sync(conf->mddev, STRIPE_SECTORS,0);
- clear_bit(STRIPE_SYNCING, &sh->state);
- s->syncing = 0;
- }
-
- /* might be able to return some write requests if the parity block
- * is safe, or on a failed drive
- */
- dev = &sh->dev[sh->pd_idx];
- if (s->written &&
- ((test_bit(R5_Insync, &dev->flags) &&
- !test_bit(R5_LOCKED, &dev->flags) &&
- test_bit(R5_UPTODATE, &dev->flags)) ||
- (s->failed == 1 && s->failed_num[0] == sh->pd_idx)))
- handle_stripe_clean_event(conf, sh, disks, &s->return_bi);
-
- /* Now we might consider reading some blocks, either to check/generate
- * parity, or to satisfy requests
- * or to load a block that is being partially written.
- */
- if (s->to_read || s->non_overwrite ||
- (s->syncing && (s->uptodate + s->compute < disks)) || s->expanding)
- handle_stripe_fill(sh, s, disks);
-
return 0;
}
@@ -3033,8 +2984,8 @@ static int handle_stripe6(struct stripe_head *sh, struct stripe_head_state *s)
{
raid5_conf_t *conf = sh->raid_conf;
int disks = sh->disks;
- int i, pd_idx = sh->pd_idx, qd_idx = sh->qd_idx;
- struct r5dev *dev, *pdev, *qdev;
+ struct r5dev *dev;
+ int i;
/* Now to look around and see what can be done */
@@ -3108,65 +3059,6 @@ static int handle_stripe6(struct stripe_head *sh, struct stripe_head_state *s)
spin_unlock_irq(&conf->device_lock);
rcu_read_unlock();
- if (unlikely(s->blocked_rdev)) {
- if (s->syncing || s->expanding || s->expanded ||
- s->to_write || s->written) {
- set_bit(STRIPE_HANDLE, &sh->state);
- return 1;
- }
- /* There is nothing for the blocked_rdev to block */
- rdev_dec_pending(s->blocked_rdev, conf->mddev);
- s->blocked_rdev = NULL;
- }
-
- if (s->to_fill && !test_bit(STRIPE_BIOFILL_RUN, &sh->state)) {
- set_bit(STRIPE_OP_BIOFILL, &s->ops_request);
- set_bit(STRIPE_BIOFILL_RUN, &sh->state);
- }
-
- pr_debug("locked=%d uptodate=%d to_read=%d"
- " to_write=%d failed=%d failed_num=%d,%d\n",
- s->locked, s->uptodate, s->to_read, s->to_write, s->failed,
- s->failed_num[0], s->failed_num[1]);
- /* check if the array has lost >2 devices and, if so, some requests
- * might need to be failed
- */
- if (s->failed > 2 && s->to_read+s->to_write+s->written)
- handle_failed_stripe(conf, sh, s, disks, &s->return_bi);
- if (s->failed > 2 && s->syncing) {
- md_done_sync(conf->mddev, STRIPE_SECTORS,0);
- clear_bit(STRIPE_SYNCING, &sh->state);
- s->syncing = 0;
- }
-
- /*
- * might be able to return some write requests if the parity blocks
- * are safe, or on a failed drive
- */
- pdev = &sh->dev[pd_idx];
- s->p_failed = (s->failed >= 1 && s->failed_num[0] == pd_idx)
- || (s->failed >= 2 && s->failed_num[1] == pd_idx);
- qdev = &sh->dev[qd_idx];
- s->q_failed = (s->failed >= 1 && s->failed_num[0] == qd_idx)
- || (s->failed >= 2 && s->failed_num[1] == qd_idx);
-
- if (s->written &&
- (s->p_failed || ((test_bit(R5_Insync, &pdev->flags)
- && !test_bit(R5_LOCKED, &pdev->flags)
- && test_bit(R5_UPTODATE, &pdev->flags)))) &&
- (s->q_failed || ((test_bit(R5_Insync, &qdev->flags)
- && !test_bit(R5_LOCKED, &qdev->flags)
- && test_bit(R5_UPTODATE, &qdev->flags)))))
- handle_stripe_clean_event(conf, sh, disks, &s->return_bi);
-
- /* Now we might consider reading some blocks, either to check/generate
- * parity, or to satisfy requests
- * or to load a block that is being partially written.
- */
- if (s->to_read || s->non_overwrite || (s->to_write && s->failed) ||
- (s->syncing && (s->uptodate + s->compute < disks)) || s->expanding)
- handle_stripe_fill(sh, s, disks);
-
return 0;
}
@@ -3178,6 +3070,7 @@ static void handle_stripe(struct stripe_head *sh)
int i;
int prexor;
int disks = sh->disks;
+ struct r5dev *pdev, *qdev;
clear_bit(STRIPE_HANDLE, &sh->state);
if (test_and_set_bit(STRIPE_ACTIVE, &sh->state)) {
@@ -3214,6 +3107,67 @@ static void handle_stripe(struct stripe_head *sh)
if (done)
goto finish;
+ if (unlikely(s.blocked_rdev)) {
+ if (s.syncing || s.expanding || s.expanded ||
+ s.to_write || s.written) {
+ set_bit(STRIPE_HANDLE, &sh->state);
+ goto finish;
+ }
+ /* There is nothing for the blocked_rdev to block */
+ rdev_dec_pending(s.blocked_rdev, conf->mddev);
+ s.blocked_rdev = NULL;
+ }
+
+ if (s.to_fill && !test_bit(STRIPE_BIOFILL_RUN, &sh->state)) {
+ set_bit(STRIPE_OP_BIOFILL, &s.ops_request);
+ set_bit(STRIPE_BIOFILL_RUN, &sh->state);
+ }
+
+ pr_debug("locked=%d uptodate=%d to_read=%d"
+ " to_write=%d failed=%d failed_num=%d,%d\n",
+ s.locked, s.uptodate, s.to_read, s.to_write, s.failed,
+ s.failed_num[0], s.failed_num[1]);
+ /* check if the array has lost >2 devices and, if so, some requests
+ * might need to be failed
+ */
+ if (s.failed > conf->max_degraded && s.to_read+s.to_write+s.written)
+ handle_failed_stripe(conf, sh, &s, disks, &s.return_bi);
+ if (s.failed > conf->max_degraded && s.syncing) {
+ md_done_sync(conf->mddev, STRIPE_SECTORS, 0);
+ clear_bit(STRIPE_SYNCING, &sh->state);
+ s.syncing = 0;
+ }
+
+ /*
+ * might be able to return some write requests if the parity blocks
+ * are safe, or on a failed drive
+ */
+ pdev = &sh->dev[sh->pd_idx];
+ s.p_failed = (s.failed >= 1 && s.failed_num[0] == sh->pd_idx)
+ || (s.failed >= 2 && s.failed_num[1] == sh->pd_idx);
+ qdev = &sh->dev[sh->qd_idx];
+ s.q_failed = (s.failed >= 1 && s.failed_num[0] == sh->qd_idx)
+ || (s.failed >= 2 && s.failed_num[1] == sh->qd_idx)
+ || conf->level < 6;
+
+ if (s.written &&
+ (s.p_failed || ((test_bit(R5_Insync, &pdev->flags)
+ && !test_bit(R5_LOCKED, &pdev->flags)
+ && test_bit(R5_UPTODATE, &pdev->flags)))) &&
+ (s.q_failed || ((test_bit(R5_Insync, &qdev->flags)
+ && !test_bit(R5_LOCKED, &qdev->flags)
+ && test_bit(R5_UPTODATE, &qdev->flags)))))
+ handle_stripe_clean_event(conf, sh, disks, &s.return_bi);
+
+ /* Now we might consider reading some blocks, either to check/generate
+ * parity, or to satisfy requests
+ * or to load a block that is being partially written.
+ */
+ if (s.to_read || s.non_overwrite
+ || (conf->level == 6 && s.to_write && s.failed)
+ || (s.syncing && (s.uptodate + s.compute < disks)) || s.expanding)
+ handle_stripe_fill(sh, &s, disks);
+
/* Now we check to see if any write operations have recently
* completed
*/
--
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