smb3: check for and properly advertise directory lease support

commit f801568332321e2b1e7a8bd26c3e4913a312a2ec upstream.

Although servers will typically ignore unsupported features,
we should advertise the support for directory leases (as
Windows e.g. does) in the negotiate protocol capabilities we
pass to the server, and should check for the server capability
(CAP_DIRECTORY_LEASING) before sending a lease request for an
open of a directory.  This will prevent us from accidentally
sending directory leases to SMB2.1 or SMB2 server for example.

Signed-off-by: Steve French <stfrench@microsoft.com>
CC: Stable <stable@vger.kernel.org>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index d4d0eb81e71f4e827c46834e5917e0f16fe8483f..5ecbc99f46e4f7f1803820268423581b5627477a 100644 (file)
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -3478,7 +3478,7 @@ struct smb_version_values smb21_values = {
 struct smb_version_values smb3any_values = {
        .version_string = SMB3ANY_VERSION_STRING,
        .protocol_id = SMB302_PROT_ID, /* doesn't matter, send protocol array */
-       .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU | SMB2_GLOBAL_CAP_PERSISTENT_HANDLES | SMB2_GLOBAL_CAP_ENCRYPTION,
+       .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU | SMB2_GLOBAL_CAP_PERSISTENT_HANDLES | SMB2_GLOBAL_CAP_ENCRYPTION | SMB2_GLOBAL_CAP_DIRECTORY_LEASING,
        .large_lock_type = 0,
        .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
        .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
@@ -3499,7 +3499,7 @@ struct smb_version_values smb3any_values = {
 struct smb_version_values smbdefault_values = {
        .version_string = SMBDEFAULT_VERSION_STRING,
        .protocol_id = SMB302_PROT_ID, /* doesn't matter, send protocol array */
-       .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU | SMB2_GLOBAL_CAP_PERSISTENT_HANDLES | SMB2_GLOBAL_CAP_ENCRYPTION,
+       .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU | SMB2_GLOBAL_CAP_PERSISTENT_HANDLES | SMB2_GLOBAL_CAP_ENCRYPTION | SMB2_GLOBAL_CAP_DIRECTORY_LEASING,
        .large_lock_type = 0,
        .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
        .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
@@ -3520,7 +3520,7 @@ struct smb_version_values smbdefault_values = {
 struct smb_version_values smb30_values = {
        .version_string = SMB30_VERSION_STRING,
        .protocol_id = SMB30_PROT_ID,
-       .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU | SMB2_GLOBAL_CAP_PERSISTENT_HANDLES | SMB2_GLOBAL_CAP_ENCRYPTION,
+       .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU | SMB2_GLOBAL_CAP_PERSISTENT_HANDLES | SMB2_GLOBAL_CAP_ENCRYPTION | SMB2_GLOBAL_CAP_DIRECTORY_LEASING,
        .large_lock_type = 0,
        .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
        .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
@@ -3541,7 +3541,7 @@ struct smb_version_values smb30_values = {
 struct smb_version_values smb302_values = {
        .version_string = SMB302_VERSION_STRING,
        .protocol_id = SMB302_PROT_ID,
-       .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU | SMB2_GLOBAL_CAP_PERSISTENT_HANDLES | SMB2_GLOBAL_CAP_ENCRYPTION,
+       .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU | SMB2_GLOBAL_CAP_PERSISTENT_HANDLES | SMB2_GLOBAL_CAP_ENCRYPTION | SMB2_GLOBAL_CAP_DIRECTORY_LEASING,
        .large_lock_type = 0,
        .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
        .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
@@ -3563,7 +3563,7 @@ struct smb_version_values smb302_values = {
 struct smb_version_values smb311_values = {
        .version_string = SMB311_VERSION_STRING,
        .protocol_id = SMB311_PROT_ID,
-       .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU | SMB2_GLOBAL_CAP_PERSISTENT_HANDLES | SMB2_GLOBAL_CAP_ENCRYPTION,
+       .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU | SMB2_GLOBAL_CAP_PERSISTENT_HANDLES | SMB2_GLOBAL_CAP_ENCRYPTION | SMB2_GLOBAL_CAP_DIRECTORY_LEASING,
        .large_lock_type = 0,
        .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
        .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,

diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 44e511a355590a3b0d8a2a88154553f6d84f72d0..82be1dfeca337afc7565b39ae5bd8840ae12154a 100644 (file)
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -2179,6 +2179,9 @@ SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
        if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
            *oplock == SMB2_OPLOCK_LEVEL_NONE)
                req->RequestedOplockLevel = *oplock;
+       else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) &&
+                 (oparms->create_options & CREATE_NOT_FILE))
+               req->RequestedOplockLevel = *oplock; /* no srv lease support */
        else {
                rc = add_lease_context(server, iov, &n_iov,
                                       oparms->fid->lease_key, oplock);