From: Jiri Kosina <jkosina@suse.cz>
Date: Tue, 15 Mar 2016 10:28:59 +0000 (+0100)
Subject: btrfs: transaction_kthread() is not freezable
X-Git-Tag: Ubuntu-4.10.0-19.21~3622^2^2
X-Git-Url: https://git.proxmox.com/?p=mirror_ubuntu-artful-kernel.git;a=commitdiff_plain;h=ce63f891e1a87ae79c4325dad5f512e8d6a8a78e

btrfs: transaction_kthread() is not freezable

transaction_kthread() is calling try_to_freeze(), but that's just an
expeinsive no-op given the fact that the thread is not marked freezable.

After removing this, disk-io.c is now independent on freezer API.

Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: David Sterba <dsterba@suse.com>
---

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index ff36a33ee9ca..81966676a26b 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -25,7 +25,6 @@
 #include <linux/buffer_head.h>
 #include <linux/workqueue.h>
 #include <linux/kthread.h>
-#include <linux/freezer.h>
 #include <linux/slab.h>
 #include <linux/migrate.h>
 #include <linux/ratelimit.h>
@@ -1928,14 +1927,12 @@ sleep:
 		if (unlikely(test_bit(BTRFS_FS_STATE_ERROR,
 				      &root->fs_info->fs_state)))
 			btrfs_cleanup_transaction(root);
-		if (!try_to_freeze()) {
-			set_current_state(TASK_INTERRUPTIBLE);
-			if (!kthread_should_stop() &&
-			    (!btrfs_transaction_blocked(root->fs_info) ||
-			     cannot_commit))
-				schedule_timeout(delay);
-			__set_current_state(TASK_RUNNING);
-		}
+		set_current_state(TASK_INTERRUPTIBLE);
+		if (!kthread_should_stop() &&
+				(!btrfs_transaction_blocked(root->fs_info) ||
+				 cannot_commit))
+			schedule_timeout(delay);
+		__set_current_state(TASK_RUNNING);
 	} while (!kthread_should_stop());
 	return 0;
 }