smb: client: fix rename(2) regression against samba

After commit 2c7d399 ("smb: client: reuse file lease key in
compound operations") the client started reusing lease keys for
rename, unlink and set path size operations to prevent it from
breaking its own leases and thus causing unnecessary lease breaks to
same connection.

The implementation relies on positive dentries and
cifsInodeInfo::lease_granted to decide whether reusing lease keys for
the compound requests.  cifsInodeInfo::lease_granted was introduced by
commit 0ab95c2 ("Defer close only when lease is enabled.") to
indicate whether lease caching is granted for a specific file, but
that can only happen until file is open, so
cifsInodeInfo::lease_granted was left uninitialised in ->alloc_inode
and then client started sending random lease keys for files that
hadn't any leases.

This fixes the following test case against samba:

mount.cifs //srv/share /mnt/1 -o ...,nosharesock
mount.cifs //srv/share /mnt/2 -o ...,nosharesock
touch /mnt/1/foo; tail -f /mnt/1/foo & pid=$!
mv /mnt/2/foo /mnt/2/bar # fails with -EIO
kill $pid

Fixes: 0ab95c2 ("Defer close only when lease is enabled.")
Signed-off-by: Paulo Alcantara (Red Hat) <[email protected]>
Signed-off-by: Steve French <[email protected]>

Author: Paulo Alcantara

fs/smb/client/cifsfs.c

@@ -389,6 +389,7 @@ cifs_alloc_inode(struct super_block *sb)
 	 * server, can not assume caching of file data or metadata.
 	 */
 	cifs_set_oplock_level(cifs_inode, 0);
+	cifs_inode->lease_granted = false;
 	cifs_inode->flags = 0;
 	spin_lock_init(&cifs_inode->writers_lock);
 	cifs_inode->writers = 0;