Btrfs: Hold a reference on bios during submit_bio, add some extra bio checks
Signed-off-by: Chris Mason <chris.mason@oracle.com>
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3ce7e67a06
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492bb6deee
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@ -180,7 +180,11 @@ loop:
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pending = pending->bi_next;
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cur->bi_next = NULL;
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atomic_dec(&device->dev_root->fs_info->nr_async_submits);
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BUG_ON(atomic_read(&cur->bi_cnt) == 0);
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bio_get(cur);
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submit_bio(cur->bi_rw, cur);
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bio_put(cur);
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num_run++;
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/*
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@ -188,10 +192,11 @@ loop:
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* is now congested. Back off and let other work structs
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* run instead
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*/
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if (pending && num_run && bdi_write_congested(bdi)) {
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if (pending && bdi_write_congested(bdi)) {
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struct bio *old_head;
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spin_lock(&device->io_lock);
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old_head = device->pending_bios;
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device->pending_bios = pending;
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if (device->pending_bio_tail)
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@ -2125,7 +2130,9 @@ int schedule_bio(struct btrfs_root *root, struct btrfs_device *device,
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/* don't bother with additional async steps for reads, right now */
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if (!(rw & (1 << BIO_RW))) {
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bio_get(bio);
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submit_bio(rw, bio);
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bio_put(bio);
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return 0;
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}
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@ -2136,6 +2143,7 @@ int schedule_bio(struct btrfs_root *root, struct btrfs_device *device,
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* on a queue for later
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*/
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atomic_inc(&root->fs_info->nr_async_submits);
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WARN_ON(bio->bi_next);
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bio->bi_next = NULL;
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bio->bi_rw |= rw;
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