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-rw-r--r--include/linux/exportfs.h9
1 files changed, 7 insertions, 2 deletions
diff --git a/include/linux/exportfs.h b/include/linux/exportfs.h
index 28028988c86..33a42f24b27 100644
--- a/include/linux/exportfs.h
+++ b/include/linux/exportfs.h
@@ -8,6 +8,9 @@ struct inode;
struct super_block;
struct vfsmount;
+/* limit the handle size to NFSv4 handle size now */
+#define MAX_HANDLE_SZ 128
+
/*
* The fileid_type identifies how the file within the filesystem is encoded.
* In theory this is freely set and parsed by the filesystem, but we try to
@@ -121,8 +124,10 @@ struct fid {
* set, the encode_fh() should store sufficient information so that a good
* attempt can be made to find not only the file but also it's place in the
* filesystem. This typically means storing a reference to de->d_parent in
- * the filehandle fragment. encode_fh() should return the number of bytes
- * stored or a negative error code such as %-ENOSPC
+ * the filehandle fragment. encode_fh() should return the fileid_type on
+ * success and on error returns 255 (if the space needed to encode fh is
+ * greater than @max_len*4 bytes). On error @max_len contains the minimum
+ * size(in 4 byte unit) needed to encode the file handle.
*
* fh_to_dentry:
* @fh_to_dentry is given a &struct super_block (@sb) and a file handle