[PATCH] cifs: fix server returning zeroed out FileID's in SMB_FIND_FILE_ID_FULL_DIR_INFO

It's possible that a server will return a valid FileID when we query the
FILE_INTERNAL_INFO for the root inode, but then zeroed out inode numbers
when we do a FindFile with an infolevel of
SMB_FIND_FILE_ID_FULL_DIR_INFO.

In this situation turn off querying for server inode numbers, and just
generate an inode number using iunique.

While I've given this patch to the reporter and asked him to test it, he
hasn't yet come back with the results. So I can't confirm whether this
really fixes the problem or not. I expect that it will, but I'll
understand if you'd rather wait to commit this until we have
confirmation.

Reported-by: Timothy Normand Miller <[email protected]>
Signed-off-by: Jeff Layton <[email protected]>
---
 fs/cifs/readdir.c |    8 +++++---
 1 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/fs/cifs/readdir.c b/fs/cifs/readdir.c
index 1f098ca..bafef8b 100644
--- a/fs/cifs/readdir.c
+++ b/fs/cifs/readdir.c
@@ -727,11 +727,13 @@ static int cifs_filldir(char *pfindEntry, struct file *file, filldir_t filldir,
 		cifs_dir_info_to_fattr(&fattr, (FILE_DIRECTORY_INFO *)
 					pfindEntry, cifs_sb);
 
-	/* FIXME: make _to_fattr functions fill this out */
-	if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_ID_FULL_DIR_INFO)
+	if (inum) {
 		fattr.cf_uniqueid = inum;
-	else
+	} else {
 		fattr.cf_uniqueid = iunique(sb, ROOT_I);
+		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
+			cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
+	}
 
 	ino = cifs_uniqueid_to_ino_t(fattr.cf_uniqueid);
 	tmp_dentry = cifs_readdir_lookup(file->f_dentry, &qstring, &fattr);
-- 
1.6.0.6