From: David Sterba <dsterba@suse.cz>
Date: Wed, 23 Jul 2014 14:39:35 +0200
Subject: [PATCH] btrfs: wake up transaction thread from SYNC_FS ioctl
(cherry picked from commit 2fad4e83e12591eb3bd213875b9edc2d18e93383)
The transaction thread may want to do more work, namely it pokes the
cleaner ktread that will start processing uncleaned subvols.
This can be triggered by user via the 'btrfs fi sync' command, otherwise
there was a delay up to 30 seconds before the cleaner started to clean
old snapshots.
Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>
---
fs/btrfs/ioctl.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 8a8e29878c34..13d577b39bfa 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -5283,6 +5283,12 @@ long btrfs_ioctl(struct file *file, unsigned int
if (ret)
return ret;
ret = btrfs_sync_fs(file->f_dentry->d_sb, 1);
+ /*
+ * The transaction thread may want to do more work,
+ * namely it pokes the cleaner ktread that will start
+ * processing uncleaned subvols.
+ */
+ wake_up_process(root->fs_info->transaction_kthread);
return ret;
}
case BTRFS_IOC_START_SYNC:
--
1.9.3