[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / cifs / smb2ops.c

/*
 *  SMB2 version specific operations
 *
 *  Copyright (c) 2012, Jeff Layton <jlayton@redhat.com>
 *
 *  This library is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License v2 as published
 *  by the Free Software Foundation.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 *  the GNU Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with this library; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include "cifsglob.h"
#include "smb2pdu.h"
#include "smb2proto.h"
#include "cifsproto.h"
#include "cifs_debug.h"

static int
change_conf(struct TCP_Server_Info *server)
{
	server->credits += server->echo_credits + server->oplock_credits;
	server->oplock_credits = server->echo_credits = 0;
	switch (server->credits) {
	case 0:
		return -1;
	case 1:
		server->echoes = false;
		server->oplocks = false;
		cERROR(1, "disabling echoes and oplocks");
		break;
	case 2:
		server->echoes = true;
		server->oplocks = false;
		server->echo_credits = 1;
		cFYI(1, "disabling oplocks");
		break;
	default:
		server->echoes = true;
		server->oplocks = true;
		server->echo_credits = 1;
		server->oplock_credits = 1;
	}
	server->credits -= server->echo_credits + server->oplock_credits;
	return 0;
}

static void
smb2_add_credits(struct TCP_Server_Info *server, const unsigned int add,
		 const int optype)
{
	int *val, rc = 0;
	spin_lock(&server->req_lock);
	val = server->ops->get_credits_field(server, optype);
	*val += add;
	server->in_flight--;
	if (server->in_flight == 0)
		rc = change_conf(server);
	spin_unlock(&server->req_lock);
	wake_up(&server->request_q);
	if (rc)
		cifs_reconnect(server);
}

static void
smb2_set_credits(struct TCP_Server_Info *server, const int val)
{
	spin_lock(&server->req_lock);
	server->credits = val;
	spin_unlock(&server->req_lock);
}

static int *
smb2_get_credits_field(struct TCP_Server_Info *server, const int optype)
{
	switch (optype) {
	case CIFS_ECHO_OP:
		return &server->echo_credits;
	case CIFS_OBREAK_OP:
		return &server->oplock_credits;
	default:
		return &server->credits;
	}
}

static unsigned int
smb2_get_credits(struct mid_q_entry *mid)
{
	return le16_to_cpu(((struct smb2_hdr *)mid->resp_buf)->CreditRequest);
}

static __u64
smb2_get_next_mid(struct TCP_Server_Info *server)
{
	__u64 mid;
	/* for SMB2 we need the current value */
	spin_lock(&GlobalMid_Lock);
	mid = server->CurrentMid++;
	spin_unlock(&GlobalMid_Lock);
	return mid;
}

struct smb_version_operations smb21_operations = {
	.setup_request = smb2_setup_request,
	.check_receive = smb2_check_receive,
	.add_credits = smb2_add_credits,
	.set_credits = smb2_set_credits,
	.get_credits_field = smb2_get_credits_field,
	.get_credits = smb2_get_credits,
	.get_next_mid = smb2_get_next_mid,
};

struct smb_version_values smb21_values = {
	.version_string = SMB21_VERSION_STRING,
	.lock_cmd = SMB2_LOCK,
};
Commit	Line	Data
1080ef75 SF	1	/*
	2	* SMB2 version specific operations
	3	*
	4	* Copyright (c) 2012, Jeff Layton <jlayton@redhat.com>
	5	*
	6	* This library is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License v2 as published
	8	* by the Free Software Foundation.
	9	*
	10	* This library is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
	13	* the GNU Lesser General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU Lesser General Public License
	16	* along with this library; if not, write to the Free Software
	17	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	18	*/
	19
	20	#include "cifsglob.h"
2dc7e1c0 PS	21	#include "smb2pdu.h"
2dc7e1c0 PS	22	#include "smb2proto.h"
28ea5290 PS	23	#include "cifsproto.h"
	24	#include "cifs_debug.h"
	25
	26	static int
	27	change_conf(struct TCP_Server_Info *server)
	28	{
	29	server->credits += server->echo_credits + server->oplock_credits;
	30	server->oplock_credits = server->echo_credits = 0;
	31	switch (server->credits) {
	32	case 0:
	33	return -1;
	34	case 1:
	35	server->echoes = false;
	36	server->oplocks = false;
	37	cERROR(1, "disabling echoes and oplocks");
	38	break;
	39	case 2:
	40	server->echoes = true;
	41	server->oplocks = false;
	42	server->echo_credits = 1;
	43	cFYI(1, "disabling oplocks");
	44	break;
	45	default:
	46	server->echoes = true;
	47	server->oplocks = true;
	48	server->echo_credits = 1;
	49	server->oplock_credits = 1;
	50	}
	51	server->credits -= server->echo_credits + server->oplock_credits;
	52	return 0;
	53	}
	54
	55	static void
	56	smb2_add_credits(struct TCP_Server_Info *server, const unsigned int add,
	57	const int optype)
	58	{
	59	int *val, rc = 0;
	60	spin_lock(&server->req_lock);
	61	val = server->ops->get_credits_field(server, optype);
	62	*val += add;
	63	server->in_flight--;
	64	if (server->in_flight == 0)
	65	rc = change_conf(server);
	66	spin_unlock(&server->req_lock);
	67	wake_up(&server->request_q);
	68	if (rc)
	69	cifs_reconnect(server);
	70	}
	71
	72	static void
	73	smb2_set_credits(struct TCP_Server_Info *server, const int val)
	74	{
	75	spin_lock(&server->req_lock);
	76	server->credits = val;
	77	spin_unlock(&server->req_lock);
	78	}
	79
	80	static int *
	81	smb2_get_credits_field(struct TCP_Server_Info *server, const int optype)
	82	{
	83	switch (optype) {
	84	case CIFS_ECHO_OP:
	85	return &server->echo_credits;
	86	case CIFS_OBREAK_OP:
87	return &server->oplock_credits;
88	default:
89	return &server->credits;
90	}
91	}
92
93	static unsigned int
94	smb2_get_credits(struct mid_q_entry *mid)
95	{
96	return le16_to_cpu(((struct smb2_hdr *)mid->resp_buf)->CreditRequest);
97	}
2dc7e1c0 PS	98
	99	static __u64
	100	smb2_get_next_mid(struct TCP_Server_Info *server)
	101	{
	102	__u64 mid;
	103	/* for SMB2 we need the current value */
	104	spin_lock(&GlobalMid_Lock);
	105	mid = server->CurrentMid++;
	106	spin_unlock(&GlobalMid_Lock);
	107	return mid;
	108	}
1080ef75 SF	109
1080ef75 SF	110	struct smb_version_operations smb21_operations = {
2dc7e1c0 PS	111	.setup_request = smb2_setup_request,
2dc7e1c0 PS	112	.check_receive = smb2_check_receive,
28ea5290 PS	113	.add_credits = smb2_add_credits,
	114	.set_credits = smb2_set_credits,
	115	.get_credits_field = smb2_get_credits_field,
	116	.get_credits = smb2_get_credits,
2dc7e1c0	117	.get_next_mid = smb2_get_next_mid,
1080ef75 SF	118	};
	119
	120	struct smb_version_values smb21_values = {
	121	.version_string = SMB21_VERSION_STRING,
2dc7e1c0	122	.lock_cmd = SMB2_LOCK,
1080ef75	123	};