VFS: Allow the filesystem to return a full file pointer on open intent

 This is needed by NFSv4 for atomicity reasons: our open command is in
 fact a lookup+open, so we need to be able to propagate open context
 information from lookup() into the resulting struct file's
 private_data field.

 Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/include/linux/namei.h b/include/linux/namei.h
index 7db67b008cac..1c975d0d9e94 100644
--- a/include/linux/namei.h
+++ b/include/linux/namei.h
@@ -8,6 +8,7 @@ struct vfsmount;
 struct open_intent {
         int     flags;
         int     create_mode;
+        struct file *file;
 };
 
 enum { MAX_NESTED_LINKS = 5 };
@@ -65,6 +66,13 @@ extern int FASTCALL(link_path_walk(const char *, struct nameidata *));
 extern void path_release(struct nameidata *);
 extern void path_release_on_umount(struct nameidata *);
 
+extern int __user_path_lookup_open(const char __user *, unsigned lookup_flags, struct nameidata *nd, int open_flags);
+extern int path_lookup_open(const char *, unsigned lookup_flags, struct nameidata *, int open_flags);
+extern struct file *lookup_instantiate_filp(struct nameidata *nd, struct dentry *dentry,
+                int (*open)(struct inode *, struct file *));
+extern struct file *nameidata_to_filp(struct nameidata *nd, int flags);
+extern void release_open_intent(struct nameidata *);
+
 extern struct dentry * lookup_one_len(const char *, struct dentry *, int);
 extern struct dentry * lookup_hash(struct qstr *, struct dentry *);