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authorJosef Bacik <jbacik@fusionio.com>2012-09-05 08:08:30 -0600
committerChris Mason <chris.mason@fusionio.com>2012-10-01 15:19:19 -0400
commit6df7881a84013f91405e5e113a4c322dd1804ba6 (patch)
tree9af9fc0b30c4062b465744a9a14ff92b76011a4c
parent425d17a290c0c63785ec65db154a95c6337aeefa (diff)
Btrfs: move the sb_end_intwrite until after the throttle logic
Sage reported the following lockdep backtrace ===================================== [ BUG: bad unlock balance detected! ] 3.6.0-rc2-ceph-00171-gc7ed62d #1 Not tainted ------------------------------------- btrfs-cleaner/7607 is trying to release lock (sb_internal) at: [<ffffffffa00422ae>] btrfs_commit_transaction+0xa6e/0xb20 [btrfs] but there are no more locks to release! other info that might help us debug this: 1 lock held by btrfs-cleaner/7607: #0: (&fs_info->cleaner_mutex){+.+...}, at: [<ffffffffa003b405>] cleaner_kthread+0x95/0x120 [btrfs] stack backtrace: Pid: 7607, comm: btrfs-cleaner Not tainted 3.6.0-rc2-ceph-00171-gc7ed62d #1 Call Trace: [<ffffffffa00422ae>] ? btrfs_commit_transaction+0xa6e/0xb20 [btrfs] [<ffffffff810afa9e>] print_unlock_inbalance_bug+0xfe/0x110 [<ffffffff810b289e>] lock_release_non_nested+0x1ee/0x310 [<ffffffff81172f9b>] ? kmem_cache_free+0x7b/0x160 [<ffffffffa004106c>] ? put_transaction+0x8c/0x130 [btrfs] [<ffffffffa00422ae>] ? btrfs_commit_transaction+0xa6e/0xb20 [btrfs] [<ffffffff810b2a95>] lock_release+0xd5/0x220 [<ffffffff81173071>] ? kmem_cache_free+0x151/0x160 [<ffffffff8117d9ed>] __sb_end_write+0x7d/0x90 [<ffffffffa00422ae>] btrfs_commit_transaction+0xa6e/0xb20 [btrfs] [<ffffffff81079850>] ? __init_waitqueue_head+0x60/0x60 [<ffffffff81634c6b>] ? _raw_spin_unlock+0x2b/0x40 [<ffffffffa0042758>] __btrfs_end_transaction+0x368/0x3c0 [btrfs] [<ffffffffa0042808>] btrfs_end_transaction_throttle+0x18/0x20 [btrfs] [<ffffffffa00318f0>] btrfs_drop_snapshot+0x410/0x600 [btrfs] [<ffffffff8132babd>] ? do_raw_spin_unlock+0x5d/0xb0 [<ffffffffa00430ef>] btrfs_clean_old_snapshots+0xaf/0x150 [btrfs] [<ffffffffa003b405>] ? cleaner_kthread+0x95/0x120 [btrfs] [<ffffffffa003b419>] cleaner_kthread+0xa9/0x120 [btrfs] [<ffffffffa003b370>] ? btrfs_destroy_delayed_refs.isra.102+0x220/0x220 [btrfs] [<ffffffff810791ee>] kthread+0xae/0xc0 [<ffffffff810b379d>] ? trace_hardirqs_on+0xd/0x10 [<ffffffff8163e744>] kernel_thread_helper+0x4/0x10 [<ffffffff81635430>] ? retint_restore_args+0x13/0x13 [<ffffffff81079140>] ? flush_kthread_work+0x1a0/0x1a0 [<ffffffff8163e740>] ? gs_change+0x13/0x13 This is because the throttle stuff can commit the transaction, which expects to be the one stopping the intwrite stuff, but we've already done it in the __btrfs_end_transaction. Moving the sb_end_intewrite after this logic makes the lockdep go away. Thanks, Tested-by: Sage Weil <sage@inktank.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com>
-rw-r--r--fs/btrfs/transaction.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index f8ae448ebec..0629edf9910 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -564,8 +564,6 @@ static int __btrfs_end_transaction(struct btrfs_trans_handle *trans,
btrfs_trans_release_metadata(trans, root);
trans->block_rsv = NULL;
- sb_end_intwrite(root->fs_info->sb);
-
if (lock && !atomic_read(&root->fs_info->open_ioctl_trans) &&
should_end_transaction(trans, root)) {
trans->transaction->blocked = 1;
@@ -586,6 +584,8 @@ static int __btrfs_end_transaction(struct btrfs_trans_handle *trans,
}
}
+ sb_end_intwrite(root->fs_info->sb);
+
WARN_ON(cur_trans != info->running_transaction);
WARN_ON(atomic_read(&cur_trans->num_writers) < 1);
atomic_dec(&cur_trans->num_writers);