Btrfs: add START_SYNC, WAIT_SYNC ioctls

[net-next-2.6.git] / fs / btrfs / ioctl.c

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 93d69b32028e3f791aa386a5ca3444504d830a24..dc5a19ed07f3aa3391bc9b822e536ee4ca456908 100644 (file)
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -2028,6 +2028,36 @@ long btrfs_ioctl_trans_end(struct file *file)
        return 0;
 }
 
+static noinline long btrfs_ioctl_start_sync(struct file *file, void __user *argp)
+{
+       struct btrfs_root *root = BTRFS_I(file->f_dentry->d_inode)->root;
+       struct btrfs_trans_handle *trans;
+       u64 transid;
+
+       trans = btrfs_start_transaction(root, 0);
+       transid = trans->transid;
+       btrfs_commit_transaction_async(trans, root, 0);
+
+       if (argp)
+               if (copy_to_user(argp, &transid, sizeof(transid)))
+                       return -EFAULT;
+       return 0;
+}
+
+static noinline long btrfs_ioctl_wait_sync(struct file *file, void __user *argp)
+{
+       struct btrfs_root *root = BTRFS_I(file->f_dentry->d_inode)->root;
+       u64 transid;
+
+       if (argp) {
+               if (copy_from_user(&transid, argp, sizeof(transid)))
+                       return -EFAULT;
+       } else {
+               transid = 0;  /* current trans */
+       }
+       return btrfs_wait_for_commit(root, transid);
+}
+
 long btrfs_ioctl(struct file *file, unsigned int
                cmd, unsigned long arg)
 {
@@ -2078,6 +2108,10 @@ long btrfs_ioctl(struct file *file, unsigned int
        case BTRFS_IOC_SYNC:
                btrfs_sync_fs(file->f_dentry->d_sb, 1);
                return 0;
+       case BTRFS_IOC_START_SYNC:
+               return btrfs_ioctl_start_sync(file, argp);
+       case BTRFS_IOC_WAIT_SYNC:
+               return btrfs_ioctl_wait_sync(file, argp);
        }
 
        return -ENOTTY;