btrfs: wake up transaction thread from SYNC_FS ioctl

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>

1 files changed, 6 insertions, 0 deletions

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index e5ed222267ee..4492e017bdb2 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -5288,6 +5288,12 @@ 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: