forked from Minki/linux
raid5: handle io error of batch list
If io error happens in any stripe of a batch list, the batch list will be split, then normal process will run for the stripes in the list. Signed-off-by: Shaohua Li <shli@fusionio.com> Signed-off-by: NeilBrown <neilb@suse.de>
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@ -1070,6 +1070,9 @@ again:
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pr_debug("skip op %ld on disc %d for sector %llu\n",
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bi->bi_rw, i, (unsigned long long)sh->sector);
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clear_bit(R5_LOCKED, &sh->dev[i].flags);
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if (sh->batch_head)
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set_bit(STRIPE_BATCH_ERR,
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&sh->batch_head->state);
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set_bit(STRIPE_HANDLE, &sh->state);
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}
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@ -2380,6 +2383,9 @@ static void raid5_end_write_request(struct bio *bi, int error)
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}
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rdev_dec_pending(rdev, conf->mddev);
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if (sh->batch_head && !uptodate)
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set_bit(STRIPE_BATCH_ERR, &sh->batch_head->state);
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if (!test_and_clear_bit(R5_DOUBLE_LOCKED, &sh->dev[i].flags))
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clear_bit(R5_LOCKED, &sh->dev[i].flags);
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set_bit(STRIPE_HANDLE, &sh->state);
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@ -4124,6 +4130,46 @@ static int clear_batch_ready(struct stripe_head *sh)
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return 0;
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}
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static void check_break_stripe_batch_list(struct stripe_head *sh)
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{
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struct stripe_head *head_sh, *next;
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int i;
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if (!test_and_clear_bit(STRIPE_BATCH_ERR, &sh->state))
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return;
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head_sh = sh;
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do {
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sh = list_first_entry(&sh->batch_list,
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struct stripe_head, batch_list);
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BUG_ON(sh == head_sh);
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} while (!test_bit(STRIPE_DEGRADED, &sh->state));
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while (sh != head_sh) {
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next = list_first_entry(&sh->batch_list,
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struct stripe_head, batch_list);
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list_del_init(&sh->batch_list);
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sh->state = head_sh->state & ~((1 << STRIPE_ACTIVE) |
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(1 << STRIPE_PREREAD_ACTIVE) |
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(1 << STRIPE_DEGRADED));
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sh->check_state = head_sh->check_state;
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sh->reconstruct_state = head_sh->reconstruct_state;
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for (i = 0; i < sh->disks; i++)
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sh->dev[i].flags = head_sh->dev[i].flags &
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(~((1 << R5_WriteError) | (1 << R5_Overlap)));
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spin_lock_irq(&sh->stripe_lock);
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sh->batch_head = NULL;
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spin_unlock_irq(&sh->stripe_lock);
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set_bit(STRIPE_HANDLE, &sh->state);
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release_stripe(sh);
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sh = next;
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}
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}
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static void handle_stripe(struct stripe_head *sh)
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{
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struct stripe_head_state s;
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@ -4146,6 +4192,8 @@ static void handle_stripe(struct stripe_head *sh)
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return;
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}
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check_break_stripe_batch_list(sh);
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if (test_bit(STRIPE_SYNC_REQUESTED, &sh->state)) {
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spin_lock(&sh->stripe_lock);
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/* Cannot process 'sync' concurrently with 'discard' */
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@ -336,6 +336,7 @@ enum {
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STRIPE_DISCARD,
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STRIPE_ON_RELEASE_LIST,
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STRIPE_BATCH_READY,
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STRIPE_BATCH_ERR,
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};
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/*
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