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| author | Josef Bacik <josef@redhat.com> | 2012-05-31 15:49:57 -0400 |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2012-06-14 21:29:12 -0400 |
| commit | d7096fc3ef8360f30f228344bc564d4f97d8a158 (patch) | |
| tree | c6a44d0b1cfc13d2449cf0d8ff8b7bae06bf0df1 | |
| parent | b939d1ab76b4aa816343cdbd8b44ce9929a3b9ef (diff) | |
| download | linux-d7096fc3ef8360f30f228344bc564d4f97d8a158.tar.gz linux-d7096fc3ef8360f30f228344bc564d4f97d8a158.tar.bz2 linux-d7096fc3ef8360f30f228344bc564d4f97d8a158.zip | |
Btrfs: wake up transaction waiters when aborting a transaction
I was getting lots of hung tasks and a NULL pointer dereference because we
are not cleaning up the transaction properly when it aborts. First we need
to reset the running_transaction to NULL so we don't get a bad dereference
for any start_transaction callers after this. Also we cannot rely on
waitqueue_active() since it's just a list_empty(), so just call wake_up()
directly since that will do the barrier for us and such. Thanks,
Signed-off-by: Josef Bacik <josef@redhat.com>
| -rw-r--r-- | fs/btrfs/disk-io.c | 9 | ||||
| -rw-r--r-- | fs/btrfs/transaction.c | 4 |
2 files changed, 7 insertions, 6 deletions
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index c79ddc756081..19b4db70dcb1 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -3589,16 +3589,13 @@ void btrfs_cleanup_one_transaction(struct btrfs_transaction *cur_trans, /* FIXME: cleanup wait for commit */ cur_trans->in_commit = 1; cur_trans->blocked = 1; - if (waitqueue_active(&root->fs_info->transaction_blocked_wait)) - wake_up(&root->fs_info->transaction_blocked_wait); + wake_up(&root->fs_info->transaction_blocked_wait); cur_trans->blocked = 0; - if (waitqueue_active(&root->fs_info->transaction_wait)) - wake_up(&root->fs_info->transaction_wait); + wake_up(&root->fs_info->transaction_wait); cur_trans->commit_done = 1; - if (waitqueue_active(&cur_trans->commit_wait)) - wake_up(&cur_trans->commit_wait); + wake_up(&cur_trans->commit_wait); btrfs_destroy_pending_snapshots(cur_trans); diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c index 1791c6e3d834..59e0203bfb95 100644 --- a/fs/btrfs/transaction.c +++ b/fs/btrfs/transaction.c @@ -1221,6 +1221,10 @@ static void cleanup_transaction(struct btrfs_trans_handle *trans, spin_lock(&root->fs_info->trans_lock); list_del_init(&cur_trans->list); + if (cur_trans == root->fs_info->running_transaction) { + root->fs_info->running_transaction = NULL; + root->fs_info->trans_no_join = 0; + } spin_unlock(&root->fs_info->trans_lock); btrfs_cleanup_one_transaction(trans->transaction, root); |