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Btrfs: Hold a reference on bios during submit_bio, add some extra bio checks

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Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2008-07-31 16:29:02 -04:00
parent 3ce7e67a06
commit 492bb6deee
1 changed files with 9 additions and 1 deletions
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10
fs/btrfs/volumes.c
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@ -180,7 +180,11 @@ int run_scheduled_bios(struct btrfs_device *device)
pending = pending->bi_next; pending = pending->bi_next;
cur->bi_next = NULL; cur->bi_next = NULL;
atomic_dec(&device->dev_root->fs_info->nr_async_submits); atomic_dec(&device->dev_root->fs_info->nr_async_submits);
BUG_ON(atomic_read(&cur->bi_cnt) == 0);
bio_get(cur);
submit_bio(cur->bi_rw, cur); submit_bio(cur->bi_rw, cur);
bio_put(cur);
num_run++; num_run++;
/* /*
@ -188,10 +192,11 @@ int run_scheduled_bios(struct btrfs_device *device)
* is now congested. Back off and let other work structs * is now congested. Back off and let other work structs
* run instead * run instead
*/ */
if (pending && num_run && bdi_write_congested(bdi)) { if (pending && bdi_write_congested(bdi)) {
struct bio *old_head; struct bio *old_head;
spin_lock(&device->io_lock); spin_lock(&device->io_lock);
old_head = device->pending_bios; old_head = device->pending_bios;
device->pending_bios = pending; device->pending_bios = pending;
if (device->pending_bio_tail) if (device->pending_bio_tail)
@ -2125,7 +2130,9 @@ int schedule_bio(struct btrfs_root *root, struct btrfs_device *device,
/* don't bother with additional async steps for reads, right now */ /* don't bother with additional async steps for reads, right now */
if (!(rw & (1 << BIO_RW))) { if (!(rw & (1 << BIO_RW))) {
bio_get(bio);
submit_bio(rw, bio); submit_bio(rw, bio);
bio_put(bio);
return 0; return 0;
} }
@ -2136,6 +2143,7 @@ int schedule_bio(struct btrfs_root *root, struct btrfs_device *device,
* on a queue for later * on a queue for later
*/ */
atomic_inc(&root->fs_info->nr_async_submits); atomic_inc(&root->fs_info->nr_async_submits);
WARN_ON(bio->bi_next);
bio->bi_next = NULL; bio->bi_next = NULL;
bio->bi_rw |= rw; bio->bi_rw |= rw;