nilfs2: add bdev freeze/thaw support

Nilfs hasn't supported the freeze/thaw feature because it didn't work
due to the peculiar design that multiple super block instances could
be allocated for a device.  This limitation was removed by the patch
"nilfs2: do not allocate multiple super block instances for a device".

So now this adds the freeze/thaw support to nilfs.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/nilfs2/ioctl.c b/fs/nilfs2/ioctl.c
index 338858fc907c..3e90f86d5bfe 100644
--- a/fs/nilfs2/ioctl.c
+++ b/fs/nilfs2/ioctl.c
@@ -580,6 +580,8 @@ static int nilfs_ioctl_clean_segments(struct inode *inode, struct file *filp,
                 goto out_free;
         }
 
+        vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);
+
         ret = nilfs_ioctl_move_blocks(inode->i_sb, &argv[0], kbufs[0]);
         if (ret < 0)
                 printk(KERN_ERR "NILFS: GC failed during preparation: "