btrfs: wake up transaction thread from SYNC_FS ioctl

commit 2fad4e83e12591eb3bd213875b9edc2d18e93383 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 8a8e29878c34283812f8d990c2432cff94bbab2a..13d577b39bfadf8a152e3b69154310506aaf360b 100644 (file)
--- 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: