nilfs2: make snapshots in checkpoint tree exportable
The previous export operations cannot handle multiple versions of
a filesystem if they belong to the same sb instance.
This adds a new type of file handle and extends export operations so
that they can get the inode specified by a checkpoint number as well
as an inode number and a generation number.
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
diff --git a/include/linux/exportfs.h b/include/linux/exportfs.h
index a9cd507..2802898 100644
--- a/include/linux/exportfs.h
+++ b/include/linux/exportfs.h
@@ -67,6 +67,19 @@
* 32 bit parent block number, 32 bit parent generation number
*/
FILEID_UDF_WITH_PARENT = 0x52,
+
+ /*
+ * 64 bit checkpoint number, 64 bit inode number,
+ * 32 bit generation number.
+ */
+ FILEID_NILFS_WITHOUT_PARENT = 0x61,
+
+ /*
+ * 64 bit checkpoint number, 64 bit inode number,
+ * 32 bit generation number, 32 bit parent generation.
+ * 64 bit parent inode number.
+ */
+ FILEID_NILFS_WITH_PARENT = 0x62,
};
struct fid {