fs/cifs/smb2ops.c - android_kernel_oneplus_msm8996 - Gitiles

 /*
  *  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 && (optype & CIFS_OP_MASK) != CIFS_NEG_OP)
 		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;
 }

 static struct mid_q_entry *
 smb2_find_mid(struct TCP_Server_Info *server, char *buf)
 {
 	struct mid_q_entry *mid;
 	struct smb2_hdr *hdr = (struct smb2_hdr *)buf;

 	spin_lock(&GlobalMid_Lock);
 	list_for_each_entry(mid, &server->pending_mid_q, qhead) {
 		if ((mid->mid == hdr->MessageId) &&
 		    (mid->mid_state == MID_REQUEST_SUBMITTED) &&
 		    (mid->command == hdr->Command)) {
 			spin_unlock(&GlobalMid_Lock);
 			return mid;
 		}
 	}
 	spin_unlock(&GlobalMid_Lock);
 	return NULL;
 }

 static void
 smb2_dump_detail(void *buf)
 {
 #ifdef CONFIG_CIFS_DEBUG2
 	struct smb2_hdr *smb = (struct smb2_hdr *)buf;

 	cERROR(1, "Cmd: %d Err: 0x%x Flags: 0x%x Mid: %llu Pid: %d",
 		  smb->Command, smb->Status, smb->Flags, smb->MessageId,
 		  smb->ProcessId);
 	cERROR(1, "smb buf %p len %u", smb, smb2_calc_size(smb));
 #endif
 }

 static bool
 smb2_need_neg(struct TCP_Server_Info *server)
 {
 	return server->max_read == 0;
 }

 static int
 smb2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 {
 	int rc;
 	ses->server->CurrentMid = 0;
 	rc = SMB2_negotiate(xid, ses);
 	/* BB we probably don't need to retry with modern servers */
 	if (rc == -EAGAIN)
 		rc = -EHOSTDOWN;
 	return rc;
 }

 static int
 smb2_is_path_accessible(const unsigned int xid, struct cifs_tcon *tcon,
 			struct cifs_sb_info *cifs_sb, const char *full_path)
 {
 	int rc;
 	__u64 persistent_fid, volatile_fid;
 	__le16 *utf16_path;

 	utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
 	if (!utf16_path)
 		return -ENOMEM;

 	rc = SMB2_open(xid, tcon, utf16_path, &persistent_fid, &volatile_fid,
 		       FILE_READ_ATTRIBUTES, FILE_OPEN, 0, 0);
 	if (rc) {
 		kfree(utf16_path);
 		return rc;
 	}

 	rc = SMB2_close(xid, tcon, persistent_fid, volatile_fid);
 	kfree(utf16_path);
 	return rc;
 }

 static int
 smb2_get_srv_inum(const unsigned int xid, struct cifs_tcon *tcon,
 		  struct cifs_sb_info *cifs_sb, const char *full_path,
 		  u64 *uniqueid, FILE_ALL_INFO *data)
 {
 	*uniqueid = le64_to_cpu(data->IndexNumber);
 	return 0;
 }

 static char *
 smb2_build_path_to_root(struct smb_vol *vol, struct cifs_sb_info *cifs_sb,
 			struct cifs_tcon *tcon)
 {
 	int pplen = vol->prepath ? strlen(vol->prepath) : 0;
 	char *full_path = NULL;

 	/* if no prefix path, simply set path to the root of share to "" */
 	if (pplen == 0) {
 		full_path = kzalloc(2, GFP_KERNEL);
 		return full_path;
 	}

 	cERROR(1, "prefixpath is not supported for SMB2 now");
 	return NULL;
 }

 static bool
 smb2_can_echo(struct TCP_Server_Info *server)
 {
 	return server->echoes;
 }

 static void
 smb2_clear_stats(struct cifs_tcon *tcon)
 {
 #ifdef CONFIG_CIFS_STATS
 	int i;
 	for (i = 0; i < NUMBER_OF_SMB2_COMMANDS; i++) {
 		atomic_set(&tcon->stats.smb2_stats.smb2_com_sent[i], 0);
 		atomic_set(&tcon->stats.smb2_stats.smb2_com_failed[i], 0);
 	}
 #endif
 }

 static void
 smb2_print_stats(struct seq_file *m, struct cifs_tcon *tcon)
 {
 #ifdef CONFIG_CIFS_STATS
 	atomic_t *sent = tcon->stats.smb2_stats.smb2_com_sent;
 	atomic_t *failed = tcon->stats.smb2_stats.smb2_com_failed;
 	seq_printf(m, "\nNegotiates: %d sent %d failed",
 		   atomic_read(&sent[SMB2_NEGOTIATE_HE]),
 		   atomic_read(&failed[SMB2_NEGOTIATE_HE]));
 	seq_printf(m, "\nSessionSetups: %d sent %d failed",
 		   atomic_read(&sent[SMB2_SESSION_SETUP_HE]),
 		   atomic_read(&failed[SMB2_SESSION_SETUP_HE]));
 #define SMB2LOGOFF		0x0002 /* trivial request/resp */
 	seq_printf(m, "\nLogoffs: %d sent %d failed",
 		   atomic_read(&sent[SMB2_LOGOFF_HE]),
 		   atomic_read(&failed[SMB2_LOGOFF_HE]));
 	seq_printf(m, "\nTreeConnects: %d sent %d failed",
 		   atomic_read(&sent[SMB2_TREE_CONNECT_HE]),
 		   atomic_read(&failed[SMB2_TREE_CONNECT_HE]));
 	seq_printf(m, "\nTreeDisconnects: %d sent %d failed",
 		   atomic_read(&sent[SMB2_TREE_DISCONNECT_HE]),
 		   atomic_read(&failed[SMB2_TREE_DISCONNECT_HE]));
 	seq_printf(m, "\nCreates: %d sent %d failed",
 		   atomic_read(&sent[SMB2_CREATE_HE]),
 		   atomic_read(&failed[SMB2_CREATE_HE]));
 	seq_printf(m, "\nCloses: %d sent %d failed",
 		   atomic_read(&sent[SMB2_CLOSE_HE]),
 		   atomic_read(&failed[SMB2_CLOSE_HE]));
 	seq_printf(m, "\nFlushes: %d sent %d failed",
 		   atomic_read(&sent[SMB2_FLUSH_HE]),
 		   atomic_read(&failed[SMB2_FLUSH_HE]));
 	seq_printf(m, "\nReads: %d sent %d failed",
 		   atomic_read(&sent[SMB2_READ_HE]),
 		   atomic_read(&failed[SMB2_READ_HE]));
 	seq_printf(m, "\nWrites: %d sent %d failed",
 		   atomic_read(&sent[SMB2_WRITE_HE]),
 		   atomic_read(&failed[SMB2_WRITE_HE]));
 	seq_printf(m, "\nLocks: %d sent %d failed",
 		   atomic_read(&sent[SMB2_LOCK_HE]),
 		   atomic_read(&failed[SMB2_LOCK_HE]));
 	seq_printf(m, "\nIOCTLs: %d sent %d failed",
 		   atomic_read(&sent[SMB2_IOCTL_HE]),
 		   atomic_read(&failed[SMB2_IOCTL_HE]));
 	seq_printf(m, "\nCancels: %d sent %d failed",
 		   atomic_read(&sent[SMB2_CANCEL_HE]),
 		   atomic_read(&failed[SMB2_CANCEL_HE]));
 	seq_printf(m, "\nEchos: %d sent %d failed",
 		   atomic_read(&sent[SMB2_ECHO_HE]),
 		   atomic_read(&failed[SMB2_ECHO_HE]));
 	seq_printf(m, "\nQueryDirectories: %d sent %d failed",
 		   atomic_read(&sent[SMB2_QUERY_DIRECTORY_HE]),
 		   atomic_read(&failed[SMB2_QUERY_DIRECTORY_HE]));
 	seq_printf(m, "\nChangeNotifies: %d sent %d failed",
 		   atomic_read(&sent[SMB2_CHANGE_NOTIFY_HE]),
 		   atomic_read(&failed[SMB2_CHANGE_NOTIFY_HE]));
 	seq_printf(m, "\nQueryInfos: %d sent %d failed",
 		   atomic_read(&sent[SMB2_QUERY_INFO_HE]),
 		   atomic_read(&failed[SMB2_QUERY_INFO_HE]));
 	seq_printf(m, "\nSetInfos: %d sent %d failed",
 		   atomic_read(&sent[SMB2_SET_INFO_HE]),
 		   atomic_read(&failed[SMB2_SET_INFO_HE]));
 	seq_printf(m, "\nOplockBreaks: %d sent %d failed",
 		   atomic_read(&sent[SMB2_OPLOCK_BREAK_HE]),
 		   atomic_read(&failed[SMB2_OPLOCK_BREAK_HE]));
 #endif
 }

 struct smb_version_operations smb21_operations = {
 	.setup_request = smb2_setup_request,
 	.setup_async_request = smb2_setup_async_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,
 	.find_mid = smb2_find_mid,
 	.check_message = smb2_check_message,
 	.dump_detail = smb2_dump_detail,
 	.clear_stats = smb2_clear_stats,
 	.print_stats = smb2_print_stats,
 	.need_neg = smb2_need_neg,
 	.negotiate = smb2_negotiate,
 	.sess_setup = SMB2_sess_setup,
 	.logoff = SMB2_logoff,
 	.tree_connect = SMB2_tcon,
 	.tree_disconnect = SMB2_tdis,
 	.is_path_accessible = smb2_is_path_accessible,
 	.can_echo = smb2_can_echo,
 	.echo = SMB2_echo,
 	.query_path_info = smb2_query_path_info,
 	.get_srv_inum = smb2_get_srv_inum,
 	.build_path_to_root = smb2_build_path_to_root,
 	.mkdir = smb2_mkdir,
 	.mkdir_setinfo = smb2_mkdir_setinfo,
 	.rmdir = smb2_rmdir,
 };

 struct smb_version_values smb21_values = {
 	.version_string = SMB21_VERSION_STRING,
 	.header_size = sizeof(struct smb2_hdr),
 	.max_header_size = MAX_SMB2_HDR_SIZE,
 	.lock_cmd = SMB2_LOCK,
 	.cap_unix = 0,
 	.cap_nt_find = SMB2_NT_FIND,
 	.cap_large_files = SMB2_LARGE_FILES,
 };
	/*
	* 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 && (optype & CIFS_OP_MASK) != CIFS_NEG_OP)
	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;
	}

	static struct mid_q_entry *
	smb2_find_mid(struct TCP_Server_Info server, char buf)
	{
	struct mid_q_entry *mid;
	struct smb2_hdr hdr = (struct smb2_hdr )buf;

	spin_lock(&GlobalMid_Lock);
	list_for_each_entry(mid, &server->pending_mid_q, qhead) {
	if ((mid->mid == hdr->MessageId) &&
	(mid->mid_state == MID_REQUEST_SUBMITTED) &&
	(mid->command == hdr->Command)) {
	spin_unlock(&GlobalMid_Lock);
	return mid;
	}
	}
	spin_unlock(&GlobalMid_Lock);
	return NULL;
	}

	static void
	smb2_dump_detail(void *buf)
	{
	#ifdef CONFIG_CIFS_DEBUG2
	struct smb2_hdr smb = (struct smb2_hdr )buf;

	cERROR(1, "Cmd: %d Err: 0x%x Flags: 0x%x Mid: %llu Pid: %d",
	smb->Command, smb->Status, smb->Flags, smb->MessageId,
	smb->ProcessId);
	cERROR(1, "smb buf %p len %u", smb, smb2_calc_size(smb));
	#endif
	}

	static bool
	smb2_need_neg(struct TCP_Server_Info *server)
	{
	return server->max_read == 0;
	}

	static int
	smb2_negotiate(const unsigned int xid, struct cifs_ses *ses)
	{
	int rc;
	ses->server->CurrentMid = 0;
	rc = SMB2_negotiate(xid, ses);
	/* BB we probably don't need to retry with modern servers */
	if (rc == -EAGAIN)
	rc = -EHOSTDOWN;
	return rc;
	}

	static int
	smb2_is_path_accessible(const unsigned int xid, struct cifs_tcon *tcon,
	struct cifs_sb_info cifs_sb, const char full_path)
	{
	int rc;
	__u64 persistent_fid, volatile_fid;
	__le16 *utf16_path;

	utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
	if (!utf16_path)
	return -ENOMEM;

	rc = SMB2_open(xid, tcon, utf16_path, &persistent_fid, &volatile_fid,
	FILE_READ_ATTRIBUTES, FILE_OPEN, 0, 0);
	if (rc) {
	kfree(utf16_path);
	return rc;
	}

	rc = SMB2_close(xid, tcon, persistent_fid, volatile_fid);
	kfree(utf16_path);
	return rc;
	}

	static int
	smb2_get_srv_inum(const unsigned int xid, struct cifs_tcon *tcon,
	struct cifs_sb_info cifs_sb, const char full_path,
	u64 uniqueid, FILE_ALL_INFO data)
	{
	*uniqueid = le64_to_cpu(data->IndexNumber);
	return 0;
	}

	static char *
	smb2_build_path_to_root(struct smb_vol vol, struct cifs_sb_info cifs_sb,
	struct cifs_tcon *tcon)
	{
	int pplen = vol->prepath ? strlen(vol->prepath) : 0;
	char *full_path = NULL;

	/* if no prefix path, simply set path to the root of share to "" */
	if (pplen == 0) {
	full_path = kzalloc(2, GFP_KERNEL);
	return full_path;
	}

	cERROR(1, "prefixpath is not supported for SMB2 now");
	return NULL;
	}

	static bool
	smb2_can_echo(struct TCP_Server_Info *server)
	{
	return server->echoes;
	}

	static void
	smb2_clear_stats(struct cifs_tcon *tcon)
	{
	#ifdef CONFIG_CIFS_STATS
	int i;
	for (i = 0; i < NUMBER_OF_SMB2_COMMANDS; i++) {
	atomic_set(&tcon->stats.smb2_stats.smb2_com_sent[i], 0);
	atomic_set(&tcon->stats.smb2_stats.smb2_com_failed[i], 0);
	}
	#endif
	}

	static void
	smb2_print_stats(struct seq_file m, struct cifs_tcon tcon)
	{
	#ifdef CONFIG_CIFS_STATS
	atomic_t *sent = tcon->stats.smb2_stats.smb2_com_sent;
	atomic_t *failed = tcon->stats.smb2_stats.smb2_com_failed;
	seq_printf(m, "\nNegotiates: %d sent %d failed",
	atomic_read(&sent[SMB2_NEGOTIATE_HE]),
	atomic_read(&failed[SMB2_NEGOTIATE_HE]));
	seq_printf(m, "\nSessionSetups: %d sent %d failed",
	atomic_read(&sent[SMB2_SESSION_SETUP_HE]),
	atomic_read(&failed[SMB2_SESSION_SETUP_HE]));
	#define SMB2LOGOFF 0x0002 /* trivial request/resp */
	seq_printf(m, "\nLogoffs: %d sent %d failed",
	atomic_read(&sent[SMB2_LOGOFF_HE]),
	atomic_read(&failed[SMB2_LOGOFF_HE]));
	seq_printf(m, "\nTreeConnects: %d sent %d failed",
	atomic_read(&sent[SMB2_TREE_CONNECT_HE]),
	atomic_read(&failed[SMB2_TREE_CONNECT_HE]));
	seq_printf(m, "\nTreeDisconnects: %d sent %d failed",
	atomic_read(&sent[SMB2_TREE_DISCONNECT_HE]),
	atomic_read(&failed[SMB2_TREE_DISCONNECT_HE]));
	seq_printf(m, "\nCreates: %d sent %d failed",
	atomic_read(&sent[SMB2_CREATE_HE]),
	atomic_read(&failed[SMB2_CREATE_HE]));
	seq_printf(m, "\nCloses: %d sent %d failed",
	atomic_read(&sent[SMB2_CLOSE_HE]),
	atomic_read(&failed[SMB2_CLOSE_HE]));
	seq_printf(m, "\nFlushes: %d sent %d failed",
	atomic_read(&sent[SMB2_FLUSH_HE]),
	atomic_read(&failed[SMB2_FLUSH_HE]));
	seq_printf(m, "\nReads: %d sent %d failed",
	atomic_read(&sent[SMB2_READ_HE]),
	atomic_read(&failed[SMB2_READ_HE]));
	seq_printf(m, "\nWrites: %d sent %d failed",
	atomic_read(&sent[SMB2_WRITE_HE]),
	atomic_read(&failed[SMB2_WRITE_HE]));
	seq_printf(m, "\nLocks: %d sent %d failed",
	atomic_read(&sent[SMB2_LOCK_HE]),
	atomic_read(&failed[SMB2_LOCK_HE]));
	seq_printf(m, "\nIOCTLs: %d sent %d failed",
	atomic_read(&sent[SMB2_IOCTL_HE]),
	atomic_read(&failed[SMB2_IOCTL_HE]));
	seq_printf(m, "\nCancels: %d sent %d failed",
	atomic_read(&sent[SMB2_CANCEL_HE]),
	atomic_read(&failed[SMB2_CANCEL_HE]));
	seq_printf(m, "\nEchos: %d sent %d failed",
	atomic_read(&sent[SMB2_ECHO_HE]),
	atomic_read(&failed[SMB2_ECHO_HE]));
	seq_printf(m, "\nQueryDirectories: %d sent %d failed",
	atomic_read(&sent[SMB2_QUERY_DIRECTORY_HE]),
	atomic_read(&failed[SMB2_QUERY_DIRECTORY_HE]));
	seq_printf(m, "\nChangeNotifies: %d sent %d failed",
	atomic_read(&sent[SMB2_CHANGE_NOTIFY_HE]),
	atomic_read(&failed[SMB2_CHANGE_NOTIFY_HE]));
	seq_printf(m, "\nQueryInfos: %d sent %d failed",
	atomic_read(&sent[SMB2_QUERY_INFO_HE]),
	atomic_read(&failed[SMB2_QUERY_INFO_HE]));
	seq_printf(m, "\nSetInfos: %d sent %d failed",
	atomic_read(&sent[SMB2_SET_INFO_HE]),
	atomic_read(&failed[SMB2_SET_INFO_HE]));
	seq_printf(m, "\nOplockBreaks: %d sent %d failed",
	atomic_read(&sent[SMB2_OPLOCK_BREAK_HE]),
	atomic_read(&failed[SMB2_OPLOCK_BREAK_HE]));
	#endif
	}

	struct smb_version_operations smb21_operations = {
	.setup_request = smb2_setup_request,
	.setup_async_request = smb2_setup_async_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,
	.find_mid = smb2_find_mid,
	.check_message = smb2_check_message,
	.dump_detail = smb2_dump_detail,
	.clear_stats = smb2_clear_stats,
	.print_stats = smb2_print_stats,
	.need_neg = smb2_need_neg,
	.negotiate = smb2_negotiate,
	.sess_setup = SMB2_sess_setup,
	.logoff = SMB2_logoff,
	.tree_connect = SMB2_tcon,
	.tree_disconnect = SMB2_tdis,
	.is_path_accessible = smb2_is_path_accessible,
	.can_echo = smb2_can_echo,
	.echo = SMB2_echo,
	.query_path_info = smb2_query_path_info,
	.get_srv_inum = smb2_get_srv_inum,
	.build_path_to_root = smb2_build_path_to_root,
	.mkdir = smb2_mkdir,
	.mkdir_setinfo = smb2_mkdir_setinfo,
	.rmdir = smb2_rmdir,
	};

	struct smb_version_values smb21_values = {
	.version_string = SMB21_VERSION_STRING,
	.header_size = sizeof(struct smb2_hdr),
	.max_header_size = MAX_SMB2_HDR_SIZE,
	.lock_cmd = SMB2_LOCK,
	.cap_unix = 0,
	.cap_nt_find = SMB2_NT_FIND,
	.cap_large_files = SMB2_LARGE_FILES,
	};