]> git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/commitdiff
md/raid5: move stripe_head_state and more code into handle_stripe.
authorNeilBrown <neilb@suse.de>
Tue, 26 Jul 2011 01:35:35 +0000 (11:35 +1000)
committerNeilBrown <neilb@suse.de>
Tue, 26 Jul 2011 01:35:35 +0000 (11:35 +1000)
By defining the 'stripe_head_state' in 'handle_stripe', we can move
some common code out of handle_stripe[56]() and into handle_stripe.

The means that all accesses for stripe_head_state in handle_stripe[56]
need to be 's->' instead of 's.', but the compiler should inline
those functions and just use a direct stack reference, and future
patches while hoist most of this code up into handle_stripe()
so we will revert to "s.".

Signed-off-by: NeilBrown <neilb@suse.de>
Reviewed-by: Namhyung Kim <namhyung@gmail.com>
drivers/md/raid5.c

index bc15f48be78dbe0400e2ab2efd4536dee1a52220..36873cfc329165b3015688927638409c4d80c867 100644 (file)
@@ -2999,24 +2999,13 @@ static void handle_stripe_expansion(raid5_conf_t *conf, struct stripe_head *sh,
  *
  */
 
-static void handle_stripe5(struct stripe_head *sh)
+static void handle_stripe5(struct stripe_head *sh, struct stripe_head_state *s)
 {
        raid5_conf_t *conf = sh->raid_conf;
        int disks = sh->disks, i;
-       struct stripe_head_state s;
        struct r5dev *dev;
        int prexor;
 
-       memset(&s, 0, sizeof(s));
-       pr_debug("handling stripe %llu, state=%#lx cnt=%d, pd_idx=%d check:%d "
-                "reconstruct:%d\n", (unsigned long long)sh->sector, sh->state,
-                atomic_read(&sh->count), sh->pd_idx, sh->check_state,
-                sh->reconstruct_state);
-
-       s.syncing = test_bit(STRIPE_SYNCING, &sh->state);
-       s.expanding = test_bit(STRIPE_EXPAND_SOURCE, &sh->state);
-       s.expanded = test_bit(STRIPE_EXPAND_READY, &sh->state);
-
        /* Now to look around and see what can be done */
        rcu_read_lock();
        spin_lock_irq(&conf->device_lock);
@@ -3039,25 +3028,28 @@ static void handle_stripe5(struct stripe_head *sh)
                        set_bit(R5_Wantfill, &dev->flags);
 
                /* now count some things */
-               if (test_bit(R5_LOCKED, &dev->flags)) s.locked++;
-               if (test_bit(R5_UPTODATE, &dev->flags)) s.uptodate++;
-               if (test_bit(R5_Wantcompute, &dev->flags)) s.compute++;
+               if (test_bit(R5_LOCKED, &dev->flags))
+                       s->locked++;
+               if (test_bit(R5_UPTODATE, &dev->flags))
+                       s->uptodate++;
+               if (test_bit(R5_Wantcompute, &dev->flags))
+                       s->compute++;
 
                if (test_bit(R5_Wantfill, &dev->flags))
-                       s.to_fill++;
+                       s->to_fill++;
                else if (dev->toread)
-                       s.to_read++;
+                       s->to_read++;
                if (dev->towrite) {
-                       s.to_write++;
+                       s->to_write++;
                        if (!test_bit(R5_OVERWRITE, &dev->flags))
-                               s.non_overwrite++;
+                               s->non_overwrite++;
                }
                if (dev->written)
-                       s.written++;
+                       s->written++;
                rdev = rcu_dereference(conf->disks[i].rdev);
-               if (s.blocked_rdev == NULL &&
+               if (s->blocked_rdev == NULL &&
                    rdev && unlikely(test_bit(Blocked, &rdev->flags))) {
-                       s.blocked_rdev = rdev;
+                       s->blocked_rdev = rdev;
                        atomic_inc(&rdev->nr_pending);
                }
                clear_bit(R5_Insync, &dev->flags);
@@ -3078,62 +3070,62 @@ static void handle_stripe5(struct stripe_head *sh)
                if (test_bit(R5_ReadError, &dev->flags))
                        clear_bit(R5_Insync, &dev->flags);
                if (!test_bit(R5_Insync, &dev->flags)) {
-                       s.failed++;
-                       s.failed_num[0] = 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) {
+       if (unlikely(s->blocked_rdev)) {
+               if (s->syncing || s->expanding || s->expanded ||
+                   s->to_write || s->written) {
                        set_bit(STRIPE_HANDLE, &sh->state);
-                       goto unlock;
+                       return;
                }
                /* There is nothing for the blocked_rdev to block */
-               rdev_dec_pending(s.blocked_rdev, conf->mddev);
-               s.blocked_rdev = NULL;
+               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);
+       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]);
+               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) {
+       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;
+               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);
+       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_fill5(sh, &s, disks);
+       if (s->to_read || s->non_overwrite ||
+           (s->syncing && (s->uptodate + s->compute < disks)) || s->expanding)
+               handle_stripe_fill5(sh, s, disks);
 
        /* Now we check to see if any write operations have recently
         * completed
@@ -3158,12 +3150,12 @@ static void handle_stripe5(struct stripe_head *sh)
                                if (prexor)
                                        continue;
                                if (!test_bit(R5_Insync, &dev->flags) ||
-                                   (i == sh->pd_idx && s.failed == 0))
+                                   (i == sh->pd_idx && s->failed == 0))
                                        set_bit(STRIPE_INSYNC, &sh->state);
                        }
                }
                if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state))
-                       s.dec_preread_active = 1;
+                       s->dec_preread_active = 1;
        }
 
        /* Now to consider new write requests and what else, if anything
@@ -3172,8 +3164,8 @@ static void handle_stripe5(struct stripe_head *sh)
         * 2/ A 'check' operation is in flight, as it may clobber the parity
         *    block.
         */
-       if (s.to_write && !sh->reconstruct_state && !sh->check_state)
-               handle_stripe_dirtying5(conf, sh, &s, disks);
+       if (s->to_write && !sh->reconstruct_state && !sh->check_state)
+               handle_stripe_dirtying5(conf, sh, s, disks);
 
        /* maybe we need to check and possibly fix the parity for this stripe
         * Any reads will already have been scheduled, so we just see if enough
@@ -3181,12 +3173,13 @@ static void handle_stripe5(struct stripe_head *sh)
         * dependent operations are in flight.
         */
        if (sh->check_state ||
-           (s.syncing && s.locked == 0 &&
+           (s->syncing && s->locked == 0 &&
             !test_bit(STRIPE_COMPUTE_RUN, &sh->state) &&
             !test_bit(STRIPE_INSYNC, &sh->state)))
-               handle_parity_checks5(conf, sh, &s, disks);
+               handle_parity_checks5(conf, sh, s, disks);
 
-       if (s.syncing && s.locked == 0 && test_bit(STRIPE_INSYNC, &sh->state)) {
+       if (s->syncing && s->locked == 0
+           && test_bit(STRIPE_INSYNC, &sh->state)) {
                md_done_sync(conf->mddev, STRIPE_SECTORS,1);
                clear_bit(STRIPE_SYNCING, &sh->state);
        }
@@ -3194,22 +3187,22 @@ static void handle_stripe5(struct stripe_head *sh)
        /* If the failed drive is just a ReadError, then we might need to progress
         * the repair/check process
         */
-       if (s.failed == 1 && !conf->mddev->ro &&
-           test_bit(R5_ReadError, &sh->dev[s.failed_num[0]].flags)
-           && !test_bit(R5_LOCKED, &sh->dev[s.failed_num[0]].flags)
-           && test_bit(R5_UPTODATE, &sh->dev[s.failed_num[0]].flags)
+       if (s->failed == 1 && !conf->mddev->ro &&
+           test_bit(R5_ReadError, &sh->dev[s->failed_num[0]].flags)
+           && !test_bit(R5_LOCKED, &sh->dev[s->failed_num[0]].flags)
+           && test_bit(R5_UPTODATE, &sh->dev[s->failed_num[0]].flags)
                ) {
-               dev = &sh->dev[s.failed_num[0]];
+               dev = &sh->dev[s->failed_num[0]];
                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);
-                       s.locked++;
+                       s->locked++;
                } else {
                        /* let's read it back */
                        set_bit(R5_Wantread, &dev->flags);
                        set_bit(R5_LOCKED, &dev->flags);
-                       s.locked++;
+                       s->locked++;
                }
        }
 
@@ -3227,7 +3220,7 @@ static void handle_stripe5(struct stripe_head *sh)
                                              &sh2->state))
                                atomic_inc(&conf->preread_active_stripes);
                        release_stripe(sh2);
-                       goto unlock;
+                       return;
                }
                if (sh2)
                        release_stripe(sh2);
@@ -3237,69 +3230,35 @@ static void handle_stripe5(struct stripe_head *sh)
                for (i = conf->raid_disks; i--; ) {
                        set_bit(R5_Wantwrite, &sh->dev[i].flags);
                        set_bit(R5_LOCKED, &sh->dev[i].flags);
-                       s.locked++;
+                       s->locked++;
                }
        }
 
-       if (s.expanded && test_bit(STRIPE_EXPANDING, &sh->state) &&
+       if (s->expanded && test_bit(STRIPE_EXPANDING, &sh->state) &&
            !sh->reconstruct_state) {
                /* Need to write out all blocks after computing parity */
                sh->disks = conf->raid_disks;
                stripe_set_idx(sh->sector, conf, 0, sh);
-               schedule_reconstruction(sh, &s, 1, 1);
-       } else if (s.expanded && !sh->reconstruct_state && s.locked == 0) {
+               schedule_reconstruction(sh, s, 1, 1);
+       } else if (s->expanded && !sh->reconstruct_state && s->locked == 0) {
                clear_bit(STRIPE_EXPAND_READY, &sh->state);
                atomic_dec(&conf->reshape_stripes);
                wake_up(&conf->wait_for_overlap);
                md_done_sync(conf->mddev, STRIPE_SECTORS, 1);
        }
 
-       if (s.expanding && s.locked == 0 &&
+       if (s->expanding && s->locked == 0 &&
            !test_bit(STRIPE_COMPUTE_RUN, &sh->state))
                handle_stripe_expansion(conf, sh, NULL);
-
- unlock:
-
-       /* wait for this device to become unblocked */
-       if (unlikely(s.blocked_rdev))
-               md_wait_for_blocked_rdev(s.blocked_rdev, conf->mddev);
-
-       if (s.ops_request)
-               raid_run_ops(sh, s.ops_request);
-
-       ops_run_io(sh, &s);
-
-       if (s.dec_preread_active) {
-               /* We delay this until after ops_run_io so that if make_request
-                * is waiting on a flush, it won't continue until the writes
-                * have actually been submitted.
-                */
-               atomic_dec(&conf->preread_active_stripes);
-               if (atomic_read(&conf->preread_active_stripes) <
-                   IO_THRESHOLD)
-                       md_wakeup_thread(conf->mddev->thread);
-       }
-       return_io(s.return_bi);
 }
 
-static void handle_stripe6(struct stripe_head *sh)
+static void 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 stripe_head_state s;
        struct r5dev *dev, *pdev, *qdev;
 
-       pr_debug("handling stripe %llu, state=%#lx cnt=%d, "
-               "pd_idx=%d, qd_idx=%d\n, check:%d, reconstruct:%d\n",
-              (unsigned long long)sh->sector, sh->state,
-              atomic_read(&sh->count), pd_idx, qd_idx,
-              sh->check_state, sh->reconstruct_state);
-       memset(&s, 0, sizeof(s));
-
-       s.syncing = test_bit(STRIPE_SYNCING, &sh->state);
-       s.expanding = test_bit(STRIPE_EXPAND_SOURCE, &sh->state);
-       s.expanded = test_bit(STRIPE_EXPAND_READY, &sh->state);
        /* Now to look around and see what can be done */
 
        rcu_read_lock();
@@ -3320,28 +3279,30 @@ static void handle_stripe6(struct stripe_head *sh)
                        set_bit(R5_Wantfill, &dev->flags);
 
                /* now count some things */
-               if (test_bit(R5_LOCKED, &dev->flags)) s.locked++;
-               if (test_bit(R5_UPTODATE, &dev->flags)) s.uptodate++;
+               if (test_bit(R5_LOCKED, &dev->flags))
+                       s->locked++;
+               if (test_bit(R5_UPTODATE, &dev->flags))
+                       s->uptodate++;
                if (test_bit(R5_Wantcompute, &dev->flags)) {
-                       s.compute++;
-                       BUG_ON(s.compute > 2);
+                       s->compute++;
+                       BUG_ON(s->compute > 2);
                }
 
                if (test_bit(R5_Wantfill, &dev->flags)) {
-                       s.to_fill++;
+                       s->to_fill++;
                } else if (dev->toread)
-                       s.to_read++;
+                       s->to_read++;
                if (dev->towrite) {
-                       s.to_write++;
+                       s->to_write++;
                        if (!test_bit(R5_OVERWRITE, &dev->flags))
-                               s.non_overwrite++;
+                               s->non_overwrite++;
                }
                if (dev->written)
-                       s.written++;
+                       s->written++;
                rdev = rcu_dereference(conf->disks[i].rdev);
-               if (s.blocked_rdev == NULL &&
+               if (s->blocked_rdev == NULL &&
                    rdev && unlikely(test_bit(Blocked, &rdev->flags))) {
-                       s.blocked_rdev = rdev;
+                       s->blocked_rdev = rdev;
                        atomic_inc(&rdev->nr_pending);
                }
                clear_bit(R5_Insync, &dev->flags);
@@ -3362,43 +3323,43 @@ static void handle_stripe6(struct stripe_head *sh)
                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++;
+                       if (s->failed < 2)
+                               s->failed_num[s->failed] = i;
+                       s->failed++;
                }
        }
        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) {
+       if (unlikely(s->blocked_rdev)) {
+               if (s->syncing || s->expanding || s->expanded ||
+                   s->to_write || s->written) {
                        set_bit(STRIPE_HANDLE, &sh->state);
-                       goto unlock;
+                       return;
                }
                /* There is nothing for the blocked_rdev to block */
-               rdev_dec_pending(s.blocked_rdev, conf->mddev);
-               s.blocked_rdev = NULL;
+               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);
+       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]);
+              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) {
+       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;
+               s->syncing = 0;
        }
 
        /*
@@ -3406,28 +3367,28 @@ static void handle_stripe6(struct stripe_head *sh)
         * 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);
+       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);
+       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)
+       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)
+           (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);
+               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_fill6(sh, &s, disks);
+       if (s->to_read || s->non_overwrite || (s->to_write && s->failed) ||
+           (s->syncing && (s->uptodate + s->compute < disks)) || s->expanding)
+               handle_stripe_fill6(sh, s, disks);
 
        /* Now we check to see if any write operations have recently
         * completed
@@ -3450,12 +3411,12 @@ static void handle_stripe6(struct stripe_head *sh)
                                set_bit(R5_Wantwrite, &dev->flags);
                                if (!test_bit(R5_Insync, &dev->flags) ||
                                    ((i == sh->pd_idx || i == qd_idx) &&
-                                     s.failed == 0))
+                                     s->failed == 0))
                                        set_bit(STRIPE_INSYNC, &sh->state);
                        }
                }
                if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state))
-                       s.dec_preread_active = 1;
+                       s->dec_preread_active = 1;
        }
 
        /* Now to consider new write requests and what else, if anything
@@ -3464,8 +3425,8 @@ static void handle_stripe6(struct stripe_head *sh)
         * 2/ A 'check' operation is in flight, as it may clobber the parity
         *    block.
         */
-       if (s.to_write && !sh->reconstruct_state && !sh->check_state)
-               handle_stripe_dirtying6(conf, sh, &s, disks);
+       if (s->to_write && !sh->reconstruct_state && !sh->check_state)
+               handle_stripe_dirtying6(conf, sh, s, disks);
 
        /* maybe we need to check and possibly fix the parity for this stripe
         * Any reads will already have been scheduled, so we just see if enough
@@ -3473,12 +3434,13 @@ static void handle_stripe6(struct stripe_head *sh)
         * dependent operations are in flight.
         */
        if (sh->check_state ||
-           (s.syncing && s.locked == 0 &&
+           (s->syncing && s->locked == 0 &&
             !test_bit(STRIPE_COMPUTE_RUN, &sh->state) &&
             !test_bit(STRIPE_INSYNC, &sh->state)))
-               handle_parity_checks6(conf, sh, &s, disks);
+               handle_parity_checks6(conf, sh, s, disks);
 
-       if (s.syncing && s.locked == 0 && test_bit(STRIPE_INSYNC, &sh->state)) {
+       if (s->syncing && s->locked == 0
+           && test_bit(STRIPE_INSYNC, &sh->state)) {
                md_done_sync(conf->mddev, STRIPE_SECTORS,1);
                clear_bit(STRIPE_SYNCING, &sh->state);
        }
@@ -3486,9 +3448,9 @@ static void handle_stripe6(struct stripe_head *sh)
        /* If the failed drives are just a ReadError, then we might need
         * to progress the repair/check process
         */
-       if (s.failed <= 2 && !conf->mddev->ro)
-               for (i = 0; i < s.failed; i++) {
-                       dev = &sh->dev[s.failed_num[i]];
+       if (s->failed <= 2 && !conf->mddev->ro)
+               for (i = 0; i < s->failed; i++) {
+                       dev = &sh->dev[s->failed_num[i]];
                        if (test_bit(R5_ReadError, &dev->flags)
                            && !test_bit(R5_LOCKED, &dev->flags)
                            && test_bit(R5_UPTODATE, &dev->flags)
@@ -3497,12 +3459,12 @@ static void handle_stripe6(struct stripe_head *sh)
                                        set_bit(R5_Wantwrite, &dev->flags);
                                        set_bit(R5_ReWrite, &dev->flags);
                                        set_bit(R5_LOCKED, &dev->flags);
-                                       s.locked++;
+                                       s->locked++;
                                } else {
                                        /* let's read it back */
                                        set_bit(R5_Wantread, &dev->flags);
                                        set_bit(R5_LOCKED, &dev->flags);
-                                       s.locked++;
+                                       s->locked++;
                                }
                        }
                }
@@ -3514,11 +3476,11 @@ static void handle_stripe6(struct stripe_head *sh)
                for (i = conf->raid_disks; i--; ) {
                        set_bit(R5_Wantwrite, &sh->dev[i].flags);
                        set_bit(R5_LOCKED, &sh->dev[i].flags);
-                       s.locked++;
+                       s->locked++;
                }
        }
 
-       if (s.expanded && test_bit(STRIPE_EXPANDING, &sh->state) &&
+       if (s->expanded && test_bit(STRIPE_EXPANDING, &sh->state) &&
            !sh->reconstruct_state) {
                struct stripe_head *sh2
                        = get_active_stripe(conf, sh->sector, 1, 1, 1);
@@ -3532,7 +3494,7 @@ static void handle_stripe6(struct stripe_head *sh)
                                              &sh2->state))
                                atomic_inc(&conf->preread_active_stripes);
                        release_stripe(sh2);
-                       goto unlock;
+                       return;
                }
                if (sh2)
                        release_stripe(sh2);
@@ -3540,19 +3502,54 @@ static void handle_stripe6(struct stripe_head *sh)
                /* Need to write out all blocks after computing P&Q */
                sh->disks = conf->raid_disks;
                stripe_set_idx(sh->sector, conf, 0, sh);
-               schedule_reconstruction(sh, &s, 1, 1);
-       } else if (s.expanded && !sh->reconstruct_state && s.locked == 0) {
+               schedule_reconstruction(sh, s, 1, 1);
+       } else if (s->expanded && !sh->reconstruct_state && s->locked == 0) {
                clear_bit(STRIPE_EXPAND_READY, &sh->state);
                atomic_dec(&conf->reshape_stripes);
                wake_up(&conf->wait_for_overlap);
                md_done_sync(conf->mddev, STRIPE_SECTORS, 1);
        }
 
-       if (s.expanding && s.locked == 0 &&
+       if (s->expanding && s->locked == 0 &&
            !test_bit(STRIPE_COMPUTE_RUN, &sh->state))
-               handle_stripe_expansion(conf, sh, &s);
+               handle_stripe_expansion(conf, sh, s);
+}
+
+static void handle_stripe(struct stripe_head *sh)
+{
+       struct stripe_head_state s;
+       raid5_conf_t *conf = sh->raid_conf;
+
+       clear_bit(STRIPE_HANDLE, &sh->state);
+       if (test_and_set_bit(STRIPE_ACTIVE, &sh->state)) {
+               /* already being handled, ensure it gets handled
+                * again when current action finishes */
+               set_bit(STRIPE_HANDLE, &sh->state);
+               return;
+       }
+
+       if (test_and_clear_bit(STRIPE_SYNC_REQUESTED, &sh->state)) {
+               set_bit(STRIPE_SYNCING, &sh->state);
+               clear_bit(STRIPE_INSYNC, &sh->state);
+       }
+       clear_bit(STRIPE_DELAYED, &sh->state);
+
+       pr_debug("handling stripe %llu, state=%#lx cnt=%d, "
+               "pd_idx=%d, qd_idx=%d\n, check:%d, reconstruct:%d\n",
+              (unsigned long long)sh->sector, sh->state,
+              atomic_read(&sh->count), sh->pd_idx, sh->qd_idx,
+              sh->check_state, sh->reconstruct_state);
+       memset(&s, 0, sizeof(s));
+
+       s.syncing = test_bit(STRIPE_SYNCING, &sh->state);
+       s.expanding = test_bit(STRIPE_EXPAND_SOURCE, &sh->state);
+       s.expanded = test_bit(STRIPE_EXPAND_READY, &sh->state);
+
+       if (conf->level == 6)
+               handle_stripe6(sh, &s);
+       else
+               handle_stripe5(sh, &s);
 
- unlock:
 
        /* wait for this device to become unblocked */
        if (unlikely(s.blocked_rdev))
@@ -3576,28 +3573,7 @@ static void handle_stripe6(struct stripe_head *sh)
        }
 
        return_io(s.return_bi);
-}
 
-static void handle_stripe(struct stripe_head *sh)
-{
-       clear_bit(STRIPE_HANDLE, &sh->state);
-       if (test_and_set_bit(STRIPE_ACTIVE, &sh->state)) {
-               /* already being handled, ensure it gets handled
-                * again when current action finishes */
-               set_bit(STRIPE_HANDLE, &sh->state);
-               return;
-       }
-
-       if (test_and_clear_bit(STRIPE_SYNC_REQUESTED, &sh->state)) {
-               set_bit(STRIPE_SYNCING, &sh->state);
-               clear_bit(STRIPE_INSYNC, &sh->state);
-       }
-       clear_bit(STRIPE_DELAYED, &sh->state);
-
-       if (sh->raid_conf->level == 6)
-               handle_stripe6(sh);
-       else
-               handle_stripe5(sh);
        clear_bit(STRIPE_ACTIVE, &sh->state);
 }