btrfs: Fix busyloop in transaction_kthread()
When a filesystem got aborted due do error, transaction_kthread() will
busyloop. Fix it by going to sleep in that case as well. Maybe we should
just stop transaction_kthread() when filesystem is aborted but that would be
more complex.
Signed-off-by: Jan Kara <jack@suse.cz>
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 16a0cad..438993e 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1640,8 +1640,10 @@
u64 transid;
unsigned long now;
unsigned long delay;
+ bool cannot_commit;
do {
+ cannot_commit = false;
delay = HZ * 30;
vfs_check_frozen(root->fs_info->sb, SB_FREEZE_WRITE);
mutex_lock(&root->fs_info->transaction_kthread_mutex);
@@ -1665,8 +1667,10 @@
/* If the file system is aborted, this will always fail. */
trans = btrfs_join_transaction(root);
- if (IS_ERR(trans))
+ if (IS_ERR(trans)) {
+ cannot_commit = true;
goto sleep;
+ }
if (transid == trans->transid) {
btrfs_commit_transaction(trans, root);
} else {
@@ -1679,7 +1683,8 @@
if (!try_to_freeze()) {
set_current_state(TASK_INTERRUPTIBLE);
if (!kthread_should_stop() &&
- !btrfs_transaction_blocked(root->fs_info))
+ (!btrfs_transaction_blocked(root->fs_info) ||
+ cannot_commit))
schedule_timeout(delay);
__set_current_state(TASK_RUNNING);
}