CIFS: Move parsing lease buffer to ops struct

Signed-off-by: NPavel Shilovsky <pshilovsky@samba.org>
Signed-off-by: NSteve French <smfrench@gmail.com>

fs/cifs/cifsglob.h

@@ -376,6 +376,8 @@ struct smb_version_operations {
 	void (*set_oplock_level)(struct cifsInodeInfo *, __u32);
 	/* create lease context buffer for CREATE request */
 	char * (*create_lease_buf)(u8 *, u8);
+	/* parse lease context buffer and return oplock info */
+	__u8 (*parse_lease_buf)(void *);
 };
 
 struct smb_version_values {

fs/cifs/smb2ops.c

@@ -748,6 +748,16 @@ smb2_create_lease_buf(u8 *lease_key, u8 oplock)
 	return (char *)buf;
 }
 
+static __u8
+smb2_parse_lease_buf(void *buf)
+{
+	struct create_lease *lc = (struct create_lease *)buf;
+
+	if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS)
+		return SMB2_OPLOCK_LEVEL_NOCHANGE;
+	return le32_to_cpu(lc->lcontext.LeaseState);
+}
+
 struct smb_version_operations smb20_operations = {
 	.compare_fids = smb2_compare_fids,
 	.setup_request = smb2_setup_request,
@@ -816,6 +826,7 @@ struct smb_version_operations smb20_operations = {
 	.is_read_op = smb2_is_read_op,
 	.set_oplock_level = smb2_set_oplock_level,
 	.create_lease_buf = smb2_create_lease_buf,
+	.parse_lease_buf = smb2_parse_lease_buf,
 };
 
 struct smb_version_operations smb21_operations = {
@@ -886,6 +897,7 @@ struct smb_version_operations smb21_operations = {
 	.is_read_op = smb21_is_read_op,
 	.set_oplock_level = smb21_set_oplock_level,
 	.create_lease_buf = smb2_create_lease_buf,
+	.parse_lease_buf = smb2_parse_lease_buf,
 };
 
 struct smb_version_operations smb30_operations = {
@@ -958,6 +970,7 @@ struct smb_version_operations smb30_operations = {
 	.is_read_op = smb21_is_read_op,
 	.set_oplock_level = smb21_set_oplock_level,
 	.create_lease_buf = smb2_create_lease_buf,
+	.parse_lease_buf = smb2_parse_lease_buf,
 };
 
 struct smb_version_values smb20_values = {

fs/cifs/smb2pdu.c

@@ -903,34 +903,27 @@ create_reconnect_durable_buf(struct cifs_fid *fid)
 }
 
 static __u8
-parse_lease_state(struct smb2_create_rsp *rsp)
+parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp)
 {
 	char *data_offset;
-	struct create_lease *lc;
-	bool found = false;
+	struct create_context *cc;
 	unsigned int next = 0;
 	char *name;
 
 	data_offset = (char *)rsp + 4 + le32_to_cpu(rsp->CreateContextsOffset);
-	lc = (struct create_lease *)data_offset;
+	cc = (struct create_context *)data_offset;
 	do {
-		lc = (struct create_lease *)((char *)lc + next);
-		name = le16_to_cpu(lc->ccontext.NameOffset) + (char *)lc;
-		if (le16_to_cpu(lc->ccontext.NameLength) != 4 ||
+		cc = (struct create_context *)((char *)cc + next);
+		name = le16_to_cpu(cc->NameOffset) + (char *)cc;
+		if (le16_to_cpu(cc->NameLength) != 4 ||
 		    strncmp(name, "RqLs", 4)) {
-			next = le32_to_cpu(lc->ccontext.Next);
+			next = le32_to_cpu(cc->Next);
 			continue;
 		}
-		if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS)
-			return SMB2_OPLOCK_LEVEL_NOCHANGE;
-		found = true;
-		break;
+		return server->ops->parse_lease_buf(cc);
 	} while (next != 0);
 
-	if (!found)
-		return 0;
-
-	return le32_to_cpu(lc->lcontext.LeaseState);
+	return 0;
 }
 
 static int
@@ -1109,7 +1102,7 @@ SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
 	}
 
 	if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
-		*oplock = parse_lease_state(rsp);
+		*oplock = parse_lease_state(server, rsp);
 	else
 		*oplock = rsp->OplockLevel;
 creat_exit: