smb3 client: fix open hardlink on deferred close file error

commit 262b73ef442e68e53220b9d6fc5a0d08b557fa42 upstream.

The following Python script results in unexpected behaviour when run on
a CIFS filesystem against a Windows Server:

    # Create file
    fd = os.open('test', os.O_WRONLY|os.O_CREAT)
    os.write(fd, b'foo')
    os.close(fd)

    # Open and close the file to leave a pending deferred close
    fd = os.open('test', os.O_RDONLY|os.O_DIRECT)
    os.close(fd)

    # Try to open the file via a hard link
    os.link('test', 'new')
    newfd = os.open('new', os.O_RDONLY|os.O_DIRECT)

The final open returns EINVAL due to the server returning
STATUS_INVALID_PARAMETER. The root cause of this is that the client
caches lease keys per inode, but the spec requires them to be related to
the filename which causes problems when hard links are involved:

From MS-SMB2 section 3.3.5.9.11:

"The server MUST attempt to locate a Lease by performing a lookup in the
LeaseTable.LeaseList using the LeaseKey in the
SMB2_CREATE_REQUEST_LEASE_V2 as the lookup key. If a lease is found,
Lease.FileDeleteOnClose is FALSE, and Lease.Filename does not match the
file name for the incoming request, the request MUST be failed with
STATUS_INVALID_PARAMETER"

On client side, we first check the context of file open, if it hits above
conditions, we first close all opening files which are belong to the same
inode, then we do open the hard link file.

Cc: stable@vger.kernel.org
Signed-off-by: Chunjie Zhu <chunjie.zhu@cloud.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

0 files changed, 0 insertions, 0 deletions