btrfs: cleaner_kthread() doesn't need explicit freeze

commit 838fe1887765f4cc679febea60d87d2a06bd300e upstream.

cleaner_kthread() is not marked freezable, and therefore calling
try_to_freeze() in its context is a pointless no-op.

In addition to that, as has been clearly demonstrated by 80ad623edd2d
("Revert "btrfs: clear PF_NOFREEZE in cleaner_kthread()"), it's perfectly
valid / legal for cleaner_kthread() to stay scheduled out in an arbitrary
place during suspend (in that particular example that was waiting for
reading of extent pages), so there is no need to leave any traces of
freezer in this kthread.

Fixes: 80ad623edd2d ("Revert "btrfs: clear PF_NOFREEZE in cleaner_kthread()")
Fixes: 696249132158 ("btrfs: clear PF_NOFREEZE in cleaner_kthread()")
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 4545e2e2ad45a556113eecf30b1a7d49ee7ca260..d8d68af5aef0855fef84b51ca8568976d0ecaac9 100644 (file)
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1830,7 +1830,7 @@ static int cleaner_kthread(void *arg)
                 */
                btrfs_delete_unused_bgs(root->fs_info);
 sleep:
-               if (!try_to_freeze() && !again) {
+               if (!again) {
                        set_current_state(TASK_INTERRUPTIBLE);
                        if (!kthread_should_stop())
                                schedule();