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authorAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>2011-01-29 18:43:25 +0530
committerAl Viro <viro@zeniv.linux.org.uk>2011-03-14 09:15:28 -0400
commit5fe0c2378884e68beb532f5890cc0e3539ac747b (patch)
treebe25414052184e146049ea6466854366559d5528 /include/linux/exportfs.h
parentc8b91accfa1059d5565443193d89572eca2f5dd6 (diff)
exportfs: Return the minimum required handle size
The exportfs encode handle function should return the minimum required handle size. This helps user to find out the handle size by passing 0 handle size in the first step and then redoing to the call again with the returned handle size value. Acked-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'include/linux/exportfs.h')
-rw-r--r--include/linux/exportfs.h6
1 files changed, 4 insertions, 2 deletions
diff --git a/include/linux/exportfs.h b/include/linux/exportfs.h
index 28028988c86..65afdfd31b7 100644
--- a/include/linux/exportfs.h
+++ b/include/linux/exportfs.h
@@ -121,8 +121,10 @@ 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