CIFS: Add oplock break support for SMB2
Signed-off-by: Pavel Shilovsky <pshilovsky@samba.org>
Signed-off-by: Steve French <smfrench@gmail.com>
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index 2d88c90..8c72e07 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -65,6 +65,17 @@
server->in_flight--;
if (server->in_flight == 0 && (optype & CIFS_OP_MASK) != CIFS_NEG_OP)
rc = change_conf(server);
+ /*
+ * Sometimes server returns 0 credits on oplock break ack - we need to
+ * rebalance credits in this case.
+ */
+ else if (server->in_flight > 0 && server->oplock_credits == 0 &&
+ server->oplocks) {
+ if (server->credits > 1) {
+ server->credits--;
+ server->oplock_credits++;
+ }
+ }
spin_unlock(&server->req_lock);
wake_up(&server->request_q);
if (rc)
@@ -502,6 +513,15 @@
return true;
}
+static int
+smb2_oplock_response(struct cifs_tcon *tcon, struct cifs_fid *fid,
+ struct cifsInodeInfo *cinode)
+{
+ return SMB2_oplock_break(0, tcon, fid->persistent_fid,
+ fid->volatile_fid,
+ cinode->clientCanCacheRead ? 1 : 0);
+}
+
struct smb_version_operations smb21_operations = {
.setup_request = smb2_setup_request,
.setup_async_request = smb2_setup_async_request,
@@ -519,6 +539,7 @@
.dump_detail = smb2_dump_detail,
.clear_stats = smb2_clear_stats,
.print_stats = smb2_print_stats,
+ .is_oplock_break = smb2_is_valid_oplock_break,
.need_neg = smb2_need_neg,
.negotiate = smb2_negotiate,
.negotiate_wsize = smb2_negotiate_wsize,
@@ -556,6 +577,7 @@
.close_dir = smb2_close_dir,
.calc_smb_size = smb2_calc_size,
.is_status_pending = smb2_is_status_pending,
+ .oplock_response = smb2_oplock_response,
};
struct smb_version_values smb21_values = {