fs: provide rcu-walk aware permission i_ops
Signed-off-by: Nick Piggin <npiggin@kernel.dk>
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index 223717d..8e21e0f 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -283,10 +283,13 @@
return 0;
}
-static int cifs_permission(struct inode *inode, int mask)
+static int cifs_permission(struct inode *inode, int mask, unsigned int flags)
{
struct cifs_sb_info *cifs_sb;
+ if (flags & IPERM_FLAG_RCU)
+ return -ECHILD;
+
cifs_sb = CIFS_SB(inode->i_sb);
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
@@ -298,7 +301,7 @@
on the client (above and beyond ACL on servers) for
servers which do not support setting and viewing mode bits,
so allowing client to check permissions is useful */
- return generic_permission(inode, mask, NULL);
+ return generic_permission(inode, mask, flags, NULL);
}
static struct kmem_cache *cifs_inode_cachep;