/*
   *  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 <linux/pagemap.h>

  #include <linux/vfs.h>

  #include <linux/falloc.h>

  #include "cifsglob.h"

  #include "smb2pdu.h"
  #include "smb2proto.h"

  #include "cifsproto.h"
  #include "cifs_debug.h"

  #include "cifs_unicode.h"

  #include "smb2status.h"

  #include "smb2glob.h"

  #include "cifs_ioctl.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;

  		cifs_dbg(VFS, "disabling echoes and oplocks
  ");

  		break;
  	case 2:
  		server->echoes = true;
  		server->oplocks = false;
  		server->echo_credits = 1;

  		cifs_dbg(FYI, "disabling oplocks
  ");

  		break;
  	default:
  		server->echoes = true;

  		if (enable_oplocks) {
  			server->oplocks = true;
  			server->oplock_credits = 1;
  		} else
  			server->oplocks = false;

  		server->echo_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;

  	if (*val > 65000) {
  		*val = 65000; /* Don't get near 64K credits, avoid srv bugs */
  		printk_once(KERN_WARNING "server overflowed SMB3 credits
  ");
  	}

  	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)
  		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 int
  smb2_wait_mtu_credits(struct TCP_Server_Info *server, unsigned int size,
  		      unsigned int *num, unsigned int *credits)
  {
  	int rc = 0;
  	unsigned int scredits;
  
  	spin_lock(&server->req_lock);
  	while (1) {
  		if (server->credits <= 0) {
  			spin_unlock(&server->req_lock);
  			cifs_num_waiters_inc(server);
  			rc = wait_event_killable(server->request_q,
  					has_credits(server, &server->credits));
  			cifs_num_waiters_dec(server);
  			if (rc)
  				return rc;
  			spin_lock(&server->req_lock);
  		} else {
  			if (server->tcpStatus == CifsExiting) {
  				spin_unlock(&server->req_lock);
  				return -ENOENT;
  			}
  
  			scredits = server->credits;
  			/* can deadlock with reopen */
  			if (scredits == 1) {
  				*num = SMB2_MAX_BUFFER_SIZE;
  				*credits = 0;
  				break;
  			}
  
  			/* leave one credit for a possible reopen */
  			scredits--;
  			*num = min_t(unsigned int, size,
  				     scredits * SMB2_MAX_BUFFER_SIZE);
  
  			*credits = DIV_ROUND_UP(*num, SMB2_MAX_BUFFER_SIZE);
  			server->credits -= *credits;
  			server->in_flight++;
  			break;
  		}
  	}
  	spin_unlock(&server->req_lock);
  	return rc;
  }

  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;

  	__u64 wire_mid = le64_to_cpu(hdr->MessageId);

  	if (hdr->ProtocolId == SMB2_TRANSFORM_PROTO_NUM) {
  		cifs_dbg(VFS, "encrypted frame parsing not supported yet");
  		return NULL;
  	}

  	spin_lock(&GlobalMid_Lock);
  	list_for_each_entry(mid, &server->pending_mid_q, qhead) {

  		if ((mid->mid == wire_mid) &&

  		    (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;

  	cifs_dbg(VFS, "Cmd: %d Err: 0x%x Flags: 0x%x Mid: %llu Pid: %d
  ",
  		 smb->Command, smb->Status, smb->Flags, smb->MessageId,
  		 smb->ProcessId);
  	cifs_dbg(VFS, "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 unsigned int
  smb2_negotiate_wsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
  {
  	struct TCP_Server_Info *server = tcon->ses->server;
  	unsigned int wsize;
  
  	/* start with specified wsize, or default */
  	wsize = volume_info->wsize ? volume_info->wsize : CIFS_DEFAULT_IOSIZE;
  	wsize = min_t(unsigned int, wsize, server->max_write);

  
  	if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
  		wsize = min_t(unsigned int, wsize, SMB2_MAX_BUFFER_SIZE);

  	return wsize;
  }
  
  static unsigned int
  smb2_negotiate_rsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
  {
  	struct TCP_Server_Info *server = tcon->ses->server;
  	unsigned int rsize;
  
  	/* start with specified rsize, or default */
  	rsize = volume_info->rsize ? volume_info->rsize : CIFS_DEFAULT_IOSIZE;
  	rsize = min_t(unsigned int, rsize, server->max_read);

  
  	if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
  		rsize = min_t(unsigned int, rsize, SMB2_MAX_BUFFER_SIZE);

  	return rsize;
  }

  #ifdef CONFIG_CIFS_STATS2
  static int
  SMB3_request_interfaces(const unsigned int xid, struct cifs_tcon *tcon)
  {
  	int rc;
  	unsigned int ret_data_len = 0;
  	struct network_interface_info_ioctl_rsp *out_buf;
  
  	rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
  			FSCTL_QUERY_NETWORK_INTERFACE_INFO, true /* is_fsctl */,
  			NULL /* no data input */, 0 /* no data input */,
  			(char **)&out_buf, &ret_data_len);

  	if (rc != 0)
  		cifs_dbg(VFS, "error %d on ioctl to get interface list
  ", rc);
  	else if (ret_data_len < sizeof(struct network_interface_info_ioctl_rsp)) {
  		cifs_dbg(VFS, "server returned bad net interface info buf
  ");
  		rc = -EINVAL;
  	} else {

  		/* Dump info on first interface */
  		cifs_dbg(FYI, "Adapter Capability 0x%x\t",
  			le32_to_cpu(out_buf->Capability));
  		cifs_dbg(FYI, "Link Speed %lld
  ",
  			le64_to_cpu(out_buf->LinkSpeed));

  	}

  	kfree(out_buf);

  	return rc;
  }
  #endif /* STATS2 */

  static void

  smb3_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon)
  {
  	int rc;
  	__le16 srch_path = 0; /* Null - open root of share */
  	u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
  	struct cifs_open_parms oparms;
  	struct cifs_fid fid;
  
  	oparms.tcon = tcon;
  	oparms.desired_access = FILE_READ_ATTRIBUTES;
  	oparms.disposition = FILE_OPEN;
  	oparms.create_options = 0;
  	oparms.fid = &fid;
  	oparms.reconnect = false;
  
  	rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL);
  	if (rc)
  		return;

  #ifdef CONFIG_CIFS_STATS2
  	SMB3_request_interfaces(xid, tcon);
  #endif /* STATS2 */

  	SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
  			FS_ATTRIBUTE_INFORMATION);
  	SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
  			FS_DEVICE_INFORMATION);
  	SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
  			FS_SECTOR_SIZE_INFORMATION); /* SMB3 specific */
  	SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
  	return;
  }
  
  static void

  smb2_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon)
  {
  	int rc;
  	__le16 srch_path = 0; /* Null - open root of share */
  	u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
  	struct cifs_open_parms oparms;
  	struct cifs_fid fid;
  
  	oparms.tcon = tcon;
  	oparms.desired_access = FILE_READ_ATTRIBUTES;
  	oparms.disposition = FILE_OPEN;
  	oparms.create_options = 0;
  	oparms.fid = &fid;
  	oparms.reconnect = false;
  
  	rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL);
  	if (rc)
  		return;

  	SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
  			FS_ATTRIBUTE_INFORMATION);
  	SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
  			FS_DEVICE_INFORMATION);

  	SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
  	return;
  }

  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;

  	__le16 *utf16_path;

  	__u8 oplock = SMB2_OPLOCK_LEVEL_NONE;

  	struct cifs_open_parms oparms;
  	struct cifs_fid fid;

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

  	oparms.tcon = tcon;
  	oparms.desired_access = FILE_READ_ATTRIBUTES;
  	oparms.disposition = FILE_OPEN;
  	oparms.create_options = 0;
  	oparms.fid = &fid;

  	oparms.reconnect = false;

  	rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL);

  	if (rc) {
  		kfree(utf16_path);
  		return rc;
  	}

  	rc = SMB2_close(xid, tcon, fid.persistent_fid, 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 int
  smb2_query_file_info(const unsigned int xid, struct cifs_tcon *tcon,
  		     struct cifs_fid *fid, FILE_ALL_INFO *data)
  {
  	int rc;
  	struct smb2_file_all_info *smb2_data;

  	smb2_data = kzalloc(sizeof(struct smb2_file_all_info) + PATH_MAX * 2,

  			    GFP_KERNEL);
  	if (smb2_data == NULL)
  		return -ENOMEM;
  
  	rc = SMB2_query_info(xid, tcon, fid->persistent_fid, fid->volatile_fid,
  			     smb2_data);
  	if (!rc)
  		move_smb2_info_to_cifs(data, smb2_data);
  	kfree(smb2_data);
  	return rc;
  }

  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_dump_share_caps(struct seq_file *m, struct cifs_tcon *tcon)
  {
  	seq_puts(m, "
  \tShare Capabilities:");
  	if (tcon->capabilities & SMB2_SHARE_CAP_DFS)
  		seq_puts(m, " DFS,");
  	if (tcon->capabilities & SMB2_SHARE_CAP_CONTINUOUS_AVAILABILITY)
  		seq_puts(m, " CONTINUOUS AVAILABILITY,");
  	if (tcon->capabilities & SMB2_SHARE_CAP_SCALEOUT)
  		seq_puts(m, " SCALEOUT,");
  	if (tcon->capabilities & SMB2_SHARE_CAP_CLUSTER)
  		seq_puts(m, " CLUSTER,");
  	if (tcon->capabilities & SMB2_SHARE_CAP_ASYMMETRIC)
  		seq_puts(m, " ASYMMETRIC,");
  	if (tcon->capabilities == 0)
  		seq_puts(m, " None");

  	if (tcon->ss_flags & SSINFO_FLAGS_ALIGNED_DEVICE)
  		seq_puts(m, " Aligned,");
  	if (tcon->ss_flags & SSINFO_FLAGS_PARTITION_ALIGNED_ON_DEVICE)
  		seq_puts(m, " Partition Aligned,");
  	if (tcon->ss_flags & SSINFO_FLAGS_NO_SEEK_PENALTY)
  		seq_puts(m, " SSD,");
  	if (tcon->ss_flags & SSINFO_FLAGS_TRIM_ENABLED)
  		seq_puts(m, " TRIM-support,");

  	seq_printf(m, "\tShare Flags: 0x%x", tcon->share_flags);

  	if (tcon->perf_sector_size)
  		seq_printf(m, "\tOptimal sector size: 0x%x",
  			   tcon->perf_sector_size);

  }
  
  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, "
  Negotiates: %d sent %d failed",
  		   atomic_read(&sent[SMB2_NEGOTIATE_HE]),
  		   atomic_read(&failed[SMB2_NEGOTIATE_HE]));
  	seq_printf(m, "
  SessionSetups: %d sent %d failed",
  		   atomic_read(&sent[SMB2_SESSION_SETUP_HE]),
  		   atomic_read(&failed[SMB2_SESSION_SETUP_HE]));

  	seq_printf(m, "
  Logoffs: %d sent %d failed",
  		   atomic_read(&sent[SMB2_LOGOFF_HE]),
  		   atomic_read(&failed[SMB2_LOGOFF_HE]));
  	seq_printf(m, "
  TreeConnects: %d sent %d failed",
  		   atomic_read(&sent[SMB2_TREE_CONNECT_HE]),
  		   atomic_read(&failed[SMB2_TREE_CONNECT_HE]));
  	seq_printf(m, "
  TreeDisconnects: %d sent %d failed",
  		   atomic_read(&sent[SMB2_TREE_DISCONNECT_HE]),
  		   atomic_read(&failed[SMB2_TREE_DISCONNECT_HE]));
  	seq_printf(m, "
  Creates: %d sent %d failed",
  		   atomic_read(&sent[SMB2_CREATE_HE]),
  		   atomic_read(&failed[SMB2_CREATE_HE]));
  	seq_printf(m, "
  Closes: %d sent %d failed",
  		   atomic_read(&sent[SMB2_CLOSE_HE]),
  		   atomic_read(&failed[SMB2_CLOSE_HE]));
  	seq_printf(m, "
  Flushes: %d sent %d failed",
  		   atomic_read(&sent[SMB2_FLUSH_HE]),
  		   atomic_read(&failed[SMB2_FLUSH_HE]));
  	seq_printf(m, "
  Reads: %d sent %d failed",
  		   atomic_read(&sent[SMB2_READ_HE]),
  		   atomic_read(&failed[SMB2_READ_HE]));
  	seq_printf(m, "
  Writes: %d sent %d failed",
  		   atomic_read(&sent[SMB2_WRITE_HE]),
  		   atomic_read(&failed[SMB2_WRITE_HE]));
  	seq_printf(m, "
  Locks: %d sent %d failed",
  		   atomic_read(&sent[SMB2_LOCK_HE]),
  		   atomic_read(&failed[SMB2_LOCK_HE]));
  	seq_printf(m, "
  IOCTLs: %d sent %d failed",
  		   atomic_read(&sent[SMB2_IOCTL_HE]),
  		   atomic_read(&failed[SMB2_IOCTL_HE]));
  	seq_printf(m, "
  Cancels: %d sent %d failed",
  		   atomic_read(&sent[SMB2_CANCEL_HE]),
  		   atomic_read(&failed[SMB2_CANCEL_HE]));
  	seq_printf(m, "
  Echos: %d sent %d failed",
  		   atomic_read(&sent[SMB2_ECHO_HE]),
  		   atomic_read(&failed[SMB2_ECHO_HE]));
  	seq_printf(m, "
  QueryDirectories: %d sent %d failed",
  		   atomic_read(&sent[SMB2_QUERY_DIRECTORY_HE]),
  		   atomic_read(&failed[SMB2_QUERY_DIRECTORY_HE]));
  	seq_printf(m, "
  ChangeNotifies: %d sent %d failed",
  		   atomic_read(&sent[SMB2_CHANGE_NOTIFY_HE]),
  		   atomic_read(&failed[SMB2_CHANGE_NOTIFY_HE]));
  	seq_printf(m, "
  QueryInfos: %d sent %d failed",
  		   atomic_read(&sent[SMB2_QUERY_INFO_HE]),
  		   atomic_read(&failed[SMB2_QUERY_INFO_HE]));
  	seq_printf(m, "
  SetInfos: %d sent %d failed",
  		   atomic_read(&sent[SMB2_SET_INFO_HE]),
  		   atomic_read(&failed[SMB2_SET_INFO_HE]));
  	seq_printf(m, "
  OplockBreaks: %d sent %d failed",
  		   atomic_read(&sent[SMB2_OPLOCK_BREAK_HE]),
  		   atomic_read(&failed[SMB2_OPLOCK_BREAK_HE]));
  #endif
  }

  static void
  smb2_set_fid(struct cifsFileInfo *cfile, struct cifs_fid *fid, __u32 oplock)
  {

  	struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));

  	struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server;

  	cfile->fid.persistent_fid = fid->persistent_fid;
  	cfile->fid.volatile_fid = fid->volatile_fid;

  	server->ops->set_oplock_level(cinode, oplock, fid->epoch,
  				      &fid->purge_cache);

  	cinode->can_cache_brlcks = CIFS_CACHE_WRITE(cinode);

  	memcpy(cfile->fid.create_guid, fid->create_guid, 16);

  }

  static void

  smb2_close_file(const unsigned int xid, struct cifs_tcon *tcon,
  		struct cifs_fid *fid)
  {

  	SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);

  }

  static int

  SMB2_request_res_key(const unsigned int xid, struct cifs_tcon *tcon,
  		     u64 persistent_fid, u64 volatile_fid,
  		     struct copychunk_ioctl *pcchunk)
  {
  	int rc;
  	unsigned int ret_data_len;
  	struct resume_key_req *res_key;
  
  	rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
  			FSCTL_SRV_REQUEST_RESUME_KEY, true /* is_fsctl */,
  			NULL, 0 /* no input */,
  			(char **)&res_key, &ret_data_len);
  
  	if (rc) {
  		cifs_dbg(VFS, "refcpy ioctl error %d getting resume key
  ", rc);
  		goto req_res_key_exit;
  	}
  	if (ret_data_len < sizeof(struct resume_key_req)) {
  		cifs_dbg(VFS, "Invalid refcopy resume key length
  ");
  		rc = -EINVAL;
  		goto req_res_key_exit;
  	}
  	memcpy(pcchunk->SourceKey, res_key->ResumeKey, COPY_CHUNK_RES_KEY_SIZE);
  
  req_res_key_exit:
  	kfree(res_key);
  	return rc;
  }
  
  static int
  smb2_clone_range(const unsigned int xid,
  			struct cifsFileInfo *srcfile,
  			struct cifsFileInfo *trgtfile, u64 src_off,
  			u64 len, u64 dest_off)
  {
  	int rc;
  	unsigned int ret_data_len;
  	struct copychunk_ioctl *pcchunk;

  	struct copychunk_ioctl_rsp *retbuf = NULL;
  	struct cifs_tcon *tcon;
  	int chunks_copied = 0;
  	bool chunk_sizes_updated = false;

  
  	pcchunk = kmalloc(sizeof(struct copychunk_ioctl), GFP_KERNEL);
  
  	if (pcchunk == NULL)
  		return -ENOMEM;
  
  	cifs_dbg(FYI, "in smb2_clone_range - about to call request res key
  ");
  	/* Request a key from the server to identify the source of the copy */
  	rc = SMB2_request_res_key(xid, tlink_tcon(srcfile->tlink),
  				srcfile->fid.persistent_fid,
  				srcfile->fid.volatile_fid, pcchunk);
  
  	/* Note: request_res_key sets res_key null only if rc !=0 */
  	if (rc)

  		goto cchunk_out;

  
  	/* For now array only one chunk long, will make more flexible later */

  	pcchunk->ChunkCount = cpu_to_le32(1);

  	pcchunk->Reserved = 0;

  	pcchunk->Reserved2 = 0;

  	tcon = tlink_tcon(trgtfile->tlink);

  	while (len > 0) {
  		pcchunk->SourceOffset = cpu_to_le64(src_off);
  		pcchunk->TargetOffset = cpu_to_le64(dest_off);
  		pcchunk->Length =
  			cpu_to_le32(min_t(u32, len, tcon->max_bytes_chunk));

  		/* Request server copy to target from src identified by key */
  		rc = SMB2_ioctl(xid, tcon, trgtfile->fid.persistent_fid,
  			trgtfile->fid.volatile_fid, FSCTL_SRV_COPYCHUNK_WRITE,
  			true /* is_fsctl */, (char *)pcchunk,
  			sizeof(struct copychunk_ioctl),	(char **)&retbuf,
  			&ret_data_len);
  		if (rc == 0) {
  			if (ret_data_len !=
  					sizeof(struct copychunk_ioctl_rsp)) {
  				cifs_dbg(VFS, "invalid cchunk response size
  ");
  				rc = -EIO;
  				goto cchunk_out;
  			}
  			if (retbuf->TotalBytesWritten == 0) {
  				cifs_dbg(FYI, "no bytes copied
  ");
  				rc = -EIO;
  				goto cchunk_out;
  			}
  			/*
  			 * Check if server claimed to write more than we asked
  			 */
  			if (le32_to_cpu(retbuf->TotalBytesWritten) >
  			    le32_to_cpu(pcchunk->Length)) {
  				cifs_dbg(VFS, "invalid copy chunk response
  ");
  				rc = -EIO;
  				goto cchunk_out;
  			}
  			if (le32_to_cpu(retbuf->ChunksWritten) != 1) {
  				cifs_dbg(VFS, "invalid num chunks written
  ");
  				rc = -EIO;
  				goto cchunk_out;
  			}
  			chunks_copied++;
  
  			src_off += le32_to_cpu(retbuf->TotalBytesWritten);
  			dest_off += le32_to_cpu(retbuf->TotalBytesWritten);
  			len -= le32_to_cpu(retbuf->TotalBytesWritten);
  
  			cifs_dbg(FYI, "Chunks %d PartialChunk %d Total %d
  ",
  				le32_to_cpu(retbuf->ChunksWritten),
  				le32_to_cpu(retbuf->ChunkBytesWritten),
  				le32_to_cpu(retbuf->TotalBytesWritten));
  		} else if (rc == -EINVAL) {
  			if (ret_data_len != sizeof(struct copychunk_ioctl_rsp))
  				goto cchunk_out;
  
  			cifs_dbg(FYI, "MaxChunks %d BytesChunk %d MaxCopy %d
  ",
  				le32_to_cpu(retbuf->ChunksWritten),
  				le32_to_cpu(retbuf->ChunkBytesWritten),
  				le32_to_cpu(retbuf->TotalBytesWritten));
  
  			/*
  			 * Check if this is the first request using these sizes,
  			 * (ie check if copy succeed once with original sizes
  			 * and check if the server gave us different sizes after
  			 * we already updated max sizes on previous request).
  			 * if not then why is the server returning an error now
  			 */
  			if ((chunks_copied != 0) || chunk_sizes_updated)
  				goto cchunk_out;
  
  			/* Check that server is not asking us to grow size */
  			if (le32_to_cpu(retbuf->ChunkBytesWritten) <
  					tcon->max_bytes_chunk)
  				tcon->max_bytes_chunk =
  					le32_to_cpu(retbuf->ChunkBytesWritten);
  			else
  				goto cchunk_out; /* server gave us bogus size */
  
  			/* No need to change MaxChunks since already set to 1 */
  			chunk_sizes_updated = true;

  		} else
  			goto cchunk_out;

  	}

  cchunk_out:

  	kfree(pcchunk);

  	kfree(retbuf);

  	return rc;
  }
  
  static int

  smb2_flush_file(const unsigned int xid, struct cifs_tcon *tcon,
  		struct cifs_fid *fid)
  {
  	return SMB2_flush(xid, tcon, fid->persistent_fid, fid->volatile_fid);
  }

  static unsigned int
  smb2_read_data_offset(char *buf)
  {
  	struct smb2_read_rsp *rsp = (struct smb2_read_rsp *)buf;
  	return rsp->DataOffset;
  }
  
  static unsigned int
  smb2_read_data_length(char *buf)
  {
  	struct smb2_read_rsp *rsp = (struct smb2_read_rsp *)buf;
  	return le32_to_cpu(rsp->DataLength);
  }

  
  static int

  smb2_sync_read(const unsigned int xid, struct cifs_fid *pfid,

  	       struct cifs_io_parms *parms, unsigned int *bytes_read,
  	       char **buf, int *buf_type)
  {

  	parms->persistent_fid = pfid->persistent_fid;
  	parms->volatile_fid = pfid->volatile_fid;

  	return SMB2_read(xid, parms, bytes_read, buf, buf_type);
  }

  static int

  smb2_sync_write(const unsigned int xid, struct cifs_fid *pfid,

  		struct cifs_io_parms *parms, unsigned int *written,
  		struct kvec *iov, unsigned long nr_segs)
  {

  	parms->persistent_fid = pfid->persistent_fid;
  	parms->volatile_fid = pfid->volatile_fid;

  	return SMB2_write(xid, parms, written, iov, nr_segs);
  }

  /* Set or clear the SPARSE_FILE attribute based on value passed in setsparse */
  static bool smb2_set_sparse(const unsigned int xid, struct cifs_tcon *tcon,
  		struct cifsFileInfo *cfile, struct inode *inode, __u8 setsparse)
  {
  	struct cifsInodeInfo *cifsi;
  	int rc;
  
  	cifsi = CIFS_I(inode);
  
  	/* if file already sparse don't bother setting sparse again */
  	if ((cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE) && setsparse)
  		return true; /* already sparse */
  
  	if (!(cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE) && !setsparse)
  		return true; /* already not sparse */
  
  	/*
  	 * Can't check for sparse support on share the usual way via the
  	 * FS attribute info (FILE_SUPPORTS_SPARSE_FILES) on the share
  	 * since Samba server doesn't set the flag on the share, yet
  	 * supports the set sparse FSCTL and returns sparse correctly
  	 * in the file attributes. If we fail setting sparse though we
  	 * mark that server does not support sparse files for this share
  	 * to avoid repeatedly sending the unsupported fsctl to server
  	 * if the file is repeatedly extended.
  	 */
  	if (tcon->broken_sparse_sup)
  		return false;
  
  	rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
  			cfile->fid.volatile_fid, FSCTL_SET_SPARSE,
  			true /* is_fctl */, &setsparse, 1, NULL, NULL);
  	if (rc) {
  		tcon->broken_sparse_sup = true;
  		cifs_dbg(FYI, "set sparse rc = %d
  ", rc);
  		return false;
  	}
  
  	if (setsparse)
  		cifsi->cifsAttrs |= FILE_ATTRIBUTE_SPARSE_FILE;
  	else
  		cifsi->cifsAttrs &= (~FILE_ATTRIBUTE_SPARSE_FILE);
  
  	return true;
  }

  static int
  smb2_set_file_size(const unsigned int xid, struct cifs_tcon *tcon,
  		   struct cifsFileInfo *cfile, __u64 size, bool set_alloc)
  {
  	__le64 eof = cpu_to_le64(size);

  	struct inode *inode;
  
  	/*
  	 * If extending file more than one page make sparse. Many Linux fs
  	 * make files sparse by default when extending via ftruncate
  	 */

  	inode = d_inode(cfile->dentry);

  
  	if (!set_alloc && (size > inode->i_size + 8192)) {

  		__u8 set_sparse = 1;

  
  		/* whether set sparse succeeds or not, extend the file */
  		smb2_set_sparse(xid, tcon, cfile, inode, set_sparse);

  	}

  	return SMB2_set_eof(xid, tcon, cfile->fid.persistent_fid,

  			    cfile->fid.volatile_fid, cfile->pid, &eof, false);

  }

  static int
  smb2_duplicate_extents(const unsigned int xid,
  			struct cifsFileInfo *srcfile,
  			struct cifsFileInfo *trgtfile, u64 src_off,
  			u64 len, u64 dest_off)
  {
  	int rc;
  	unsigned int ret_data_len;

  	struct duplicate_extents_to_file dup_ext_buf;
  	struct cifs_tcon *tcon = tlink_tcon(trgtfile->tlink);
  
  	/* server fileays advertise duplicate extent support with this flag */
  	if ((le32_to_cpu(tcon->fsAttrInfo.Attributes) &
  	     FILE_SUPPORTS_BLOCK_REFCOUNTING) == 0)
  		return -EOPNOTSUPP;
  
  	dup_ext_buf.VolatileFileHandle = srcfile->fid.volatile_fid;
  	dup_ext_buf.PersistentFileHandle = srcfile->fid.persistent_fid;
  	dup_ext_buf.SourceFileOffset = cpu_to_le64(src_off);
  	dup_ext_buf.TargetFileOffset = cpu_to_le64(dest_off);
  	dup_ext_buf.ByteCount = cpu_to_le64(len);
  	cifs_dbg(FYI, "duplicate extents: src off %lld dst off %lld len %lld",
  		src_off, dest_off, len);
  
  	rc = smb2_set_file_size(xid, tcon, trgtfile, dest_off + len, false);
  	if (rc)
  		goto duplicate_extents_out;
  
  	rc = SMB2_ioctl(xid, tcon, trgtfile->fid.persistent_fid,
  			trgtfile->fid.volatile_fid,
  			FSCTL_DUPLICATE_EXTENTS_TO_FILE,
  			true /* is_fsctl */, (char *)&dup_ext_buf,
  			sizeof(struct duplicate_extents_to_file),

  			NULL,

  			&ret_data_len);
  
  	if (ret_data_len > 0)
  		cifs_dbg(FYI, "non-zero response length in duplicate extents");
  
  duplicate_extents_out:
  	return rc;
  }

  static int

  smb2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
  		   struct cifsFileInfo *cfile)
  {
  	return SMB2_set_compression(xid, tcon, cfile->fid.persistent_fid,
  			    cfile->fid.volatile_fid);
  }
  
  static int

  smb3_set_integrity(const unsigned int xid, struct cifs_tcon *tcon,
  		   struct cifsFileInfo *cfile)
  {
  	struct fsctl_set_integrity_information_req integr_info;

  	unsigned int ret_data_len;
  
  	integr_info.ChecksumAlgorithm = cpu_to_le16(CHECKSUM_TYPE_UNCHANGED);
  	integr_info.Flags = 0;
  	integr_info.Reserved = 0;
  
  	return SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
  			cfile->fid.volatile_fid,
  			FSCTL_SET_INTEGRITY_INFORMATION,
  			true /* is_fsctl */, (char *)&integr_info,
  			sizeof(struct fsctl_set_integrity_information_req),

  			NULL,

  			&ret_data_len);
  
  }
  
  static int

  smb3_enum_snapshots(const unsigned int xid, struct cifs_tcon *tcon,
  		   struct cifsFileInfo *cfile, void __user *ioc_buf)
  {
  	char *retbuf = NULL;
  	unsigned int ret_data_len = 0;
  	int rc;
  	struct smb_snapshot_array snapshot_in;
  
  	rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
  			cfile->fid.volatile_fid,
  			FSCTL_SRV_ENUMERATE_SNAPSHOTS,
  			true /* is_fsctl */, NULL, 0 /* no input data */,
  			(char **)&retbuf,
  			&ret_data_len);
  	cifs_dbg(FYI, "enum snaphots ioctl returned %d and ret buflen is %d
  ",
  			rc, ret_data_len);
  	if (rc)
  		return rc;
  
  	if (ret_data_len && (ioc_buf != NULL) && (retbuf != NULL)) {
  		/* Fixup buffer */
  		if (copy_from_user(&snapshot_in, ioc_buf,
  		    sizeof(struct smb_snapshot_array))) {
  			rc = -EFAULT;
  			kfree(retbuf);
  			return rc;
  		}
  		if (snapshot_in.snapshot_array_size < sizeof(struct smb_snapshot_array)) {
  			rc = -ERANGE;
  			return rc;
  		}
  
  		if (ret_data_len > snapshot_in.snapshot_array_size)
  			ret_data_len = snapshot_in.snapshot_array_size;
  
  		if (copy_to_user(ioc_buf, retbuf, ret_data_len))
  			rc = -EFAULT;
  	}
  
  	kfree(retbuf);
  	return rc;
  }
  
  static int

  smb2_query_dir_first(const unsigned int xid, struct cifs_tcon *tcon,
  		     const char *path, struct cifs_sb_info *cifs_sb,
  		     struct cifs_fid *fid, __u16 search_flags,
  		     struct cifs_search_info *srch_inf)
  {
  	__le16 *utf16_path;
  	int rc;

  	__u8 oplock = SMB2_OPLOCK_LEVEL_NONE;

  	struct cifs_open_parms oparms;

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

  	oparms.tcon = tcon;
  	oparms.desired_access = FILE_READ_ATTRIBUTES | FILE_READ_DATA;
  	oparms.disposition = FILE_OPEN;
  	oparms.create_options = 0;
  	oparms.fid = fid;

  	oparms.reconnect = false;

  	rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL);

  	kfree(utf16_path);
  	if (rc) {

  		cifs_dbg(VFS, "open dir failed
  ");

  		return rc;
  	}
  
  	srch_inf->entries_in_buffer = 0;
  	srch_inf->index_of_last_entry = 0;

  	rc = SMB2_query_directory(xid, tcon, fid->persistent_fid,
  				  fid->volatile_fid, 0, srch_inf);

  	if (rc) {

  		cifs_dbg(VFS, "query directory failed
  ");

  		SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);

  	}
  	return rc;
  }
  
  static int
  smb2_query_dir_next(const unsigned int xid, struct cifs_tcon *tcon,
  		    struct cifs_fid *fid, __u16 search_flags,
  		    struct cifs_search_info *srch_inf)
  {
  	return SMB2_query_directory(xid, tcon, fid->persistent_fid,
  				    fid->volatile_fid, 0, srch_inf);
  }
  
  static int
  smb2_close_dir(const unsigned int xid, struct cifs_tcon *tcon,
  	       struct cifs_fid *fid)
  {
  	return SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);
  }

  /*
  * If we negotiate SMB2 protocol and get STATUS_PENDING - update
  * the number of credits and return true. Otherwise - return false.
  */
  static bool
  smb2_is_status_pending(char *buf, struct TCP_Server_Info *server, int length)
  {
  	struct smb2_hdr *hdr = (struct smb2_hdr *)buf;

  	if (hdr->Status != STATUS_PENDING)

  		return false;
  
  	if (!length) {
  		spin_lock(&server->req_lock);
  		server->credits += le16_to_cpu(hdr->CreditRequest);
  		spin_unlock(&server->req_lock);
  		wake_up(&server->request_q);
  	}
  
  	return true;
  }

  static int
  smb2_oplock_response(struct cifs_tcon *tcon, struct cifs_fid *fid,
  		     struct cifsInodeInfo *cinode)
  {

  	if (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LEASING)
  		return SMB2_lease_break(0, tcon, cinode->lease_key,
  					smb2_get_lease_state(cinode));

  	return SMB2_oplock_break(0, tcon, fid->persistent_fid,
  				 fid->volatile_fid,

  				 CIFS_CACHE_READ(cinode) ? 1 : 0);

  }

  static int
  smb2_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
  	     struct kstatfs *buf)
  {
  	int rc;

  	__le16 srch_path = 0; /* Null - open root of share */
  	u8 oplock = SMB2_OPLOCK_LEVEL_NONE;

  	struct cifs_open_parms oparms;
  	struct cifs_fid fid;
  
  	oparms.tcon = tcon;
  	oparms.desired_access = FILE_READ_ATTRIBUTES;
  	oparms.disposition = FILE_OPEN;
  	oparms.create_options = 0;
  	oparms.fid = &fid;

  	oparms.reconnect = false;

  	rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL);

  	if (rc)
  		return rc;
  	buf->f_type = SMB2_MAGIC_NUMBER;

  	rc = SMB2_QFS_info(xid, tcon, fid.persistent_fid, fid.volatile_fid,
  			   buf);
  	SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);

  	return rc;
  }

  static bool
  smb2_compare_fids(struct cifsFileInfo *ob1, struct cifsFileInfo *ob2)
  {
  	return ob1->fid.persistent_fid == ob2->fid.persistent_fid &&
  	       ob1->fid.volatile_fid == ob2->fid.volatile_fid;
  }

  static int
  smb2_mand_lock(const unsigned int xid, struct cifsFileInfo *cfile, __u64 offset,
  	       __u64 length, __u32 type, int lock, int unlock, bool wait)
  {
  	if (unlock && !lock)
  		type = SMB2_LOCKFLAG_UNLOCK;
  	return SMB2_lock(xid, tlink_tcon(cfile->tlink),
  			 cfile->fid.persistent_fid, cfile->fid.volatile_fid,
  			 current->tgid, length, offset, type, wait);
  }

  static void
  smb2_get_lease_key(struct inode *inode, struct cifs_fid *fid)
  {
  	memcpy(fid->lease_key, CIFS_I(inode)->lease_key, SMB2_LEASE_KEY_SIZE);
  }
  
  static void
  smb2_set_lease_key(struct inode *inode, struct cifs_fid *fid)
  {
  	memcpy(CIFS_I(inode)->lease_key, fid->lease_key, SMB2_LEASE_KEY_SIZE);
  }
  
  static void
  smb2_new_lease_key(struct cifs_fid *fid)
  {

  	generate_random_uuid(fid->lease_key);

  }

  #define SMB2_SYMLINK_STRUCT_SIZE \
  	(sizeof(struct smb2_err_rsp) - 1 + sizeof(struct smb2_symlink_err_rsp))

  static int
  smb2_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
  		   const char *full_path, char **target_path,
  		   struct cifs_sb_info *cifs_sb)
  {
  	int rc;
  	__le16 *utf16_path;
  	__u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
  	struct cifs_open_parms oparms;
  	struct cifs_fid fid;
  	struct smb2_err_rsp *err_buf = NULL;
  	struct smb2_symlink_err_rsp *symlink;

  	unsigned int sub_len;
  	unsigned int sub_offset;
  	unsigned int print_len;
  	unsigned int print_offset;

  
  	cifs_dbg(FYI, "%s: path: %s
  ", __func__, full_path);
  
  	utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
  	if (!utf16_path)
  		return -ENOMEM;
  
  	oparms.tcon = tcon;
  	oparms.desired_access = FILE_READ_ATTRIBUTES;
  	oparms.disposition = FILE_OPEN;
  	oparms.create_options = 0;
  	oparms.fid = &fid;
  	oparms.reconnect = false;
  
  	rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, &err_buf);
  
  	if (!rc || !err_buf) {
  		kfree(utf16_path);
  		return -ENOENT;
  	}

  
  	if (le32_to_cpu(err_buf->ByteCount) < sizeof(struct smb2_symlink_err_rsp) ||
  	    get_rfc1002_length(err_buf) + 4 < SMB2_SYMLINK_STRUCT_SIZE) {
  		kfree(utf16_path);
  		return -ENOENT;
  	}

  	/* open must fail on symlink - reset rc */
  	rc = 0;
  	symlink = (struct smb2_symlink_err_rsp *)err_buf->ErrorData;
  	sub_len = le16_to_cpu(symlink->SubstituteNameLength);
  	sub_offset = le16_to_cpu(symlink->SubstituteNameOffset);

  	print_len = le16_to_cpu(symlink->PrintNameLength);
  	print_offset = le16_to_cpu(symlink->PrintNameOffset);
  
  	if (get_rfc1002_length(err_buf) + 4 <
  			SMB2_SYMLINK_STRUCT_SIZE + sub_offset + sub_len) {
  		kfree(utf16_path);
  		return -ENOENT;
  	}
  
  	if (get_rfc1002_length(err_buf) + 4 <
  			SMB2_SYMLINK_STRUCT_SIZE + print_offset + print_len) {
  		kfree(utf16_path);
  		return -ENOENT;
  	}

  	*target_path = cifs_strndup_from_utf16(
  				(char *)symlink->PathBuffer + sub_offset,
  				sub_len, true, cifs_sb->local_nls);
  	if (!(*target_path)) {
  		kfree(utf16_path);
  		return -ENOMEM;
  	}
  	convert_delimiter(*target_path, '/');
  	cifs_dbg(FYI, "%s: target path: %s
  ", __func__, *target_path);
  	kfree(utf16_path);
  	return rc;
  }

  static long smb3_zero_range(struct file *file, struct cifs_tcon *tcon,
  			    loff_t offset, loff_t len, bool keep_size)
  {
  	struct inode *inode;
  	struct cifsInodeInfo *cifsi;
  	struct cifsFileInfo *cfile = file->private_data;
  	struct file_zero_data_information fsctl_buf;
  	long rc;
  	unsigned int xid;
  
  	xid = get_xid();

  	inode = d_inode(cfile->dentry);

  	cifsi = CIFS_I(inode);
  
  	/* if file not oplocked can't be sure whether asking to extend size */
  	if (!CIFS_CACHE_READ(cifsi))
  		if (keep_size == false)
  			return -EOPNOTSUPP;

  	/*

  	 * Must check if file sparse since fallocate -z (zero range) assumes
  	 * non-sparse allocation
  	 */
  	if (!(cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE))
  		return -EOPNOTSUPP;
  
  	/*
  	 * need to make sure we are not asked to extend the file since the SMB3
  	 * fsctl does not change the file size. In the future we could change
  	 * this to zero the first part of the range then set the file size
  	 * which for a non sparse file would zero the newly extended range
  	 */
  	if (keep_size == false)
  		if (i_size_read(inode) < offset + len)
  			return -EOPNOTSUPP;
  
  	cifs_dbg(FYI, "offset %lld len %lld", offset, len);
  
  	fsctl_buf.FileOffset = cpu_to_le64(offset);
  	fsctl_buf.BeyondFinalZero = cpu_to_le64(offset + len);
  
  	rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
  			cfile->fid.volatile_fid, FSCTL_SET_ZERO_DATA,
  			true /* is_fctl */, (char *)&fsctl_buf,
  			sizeof(struct file_zero_data_information), NULL, NULL);
  	free_xid(xid);
  	return rc;
  }

  static long smb3_punch_hole(struct file *file, struct cifs_tcon *tcon,
  			    loff_t offset, loff_t len)
  {
  	struct inode *inode;
  	struct cifsInodeInfo *cifsi;
  	struct cifsFileInfo *cfile = file->private_data;
  	struct file_zero_data_information fsctl_buf;
  	long rc;
  	unsigned int xid;
  	__u8 set_sparse = 1;
  
  	xid = get_xid();

  	inode = d_inode(cfile->dentry);

  	cifsi = CIFS_I(inode);
  
  	/* Need to make file sparse, if not already, before freeing range. */
  	/* Consider adding equivalent for compressed since it could also work */
  	if (!smb2_set_sparse(xid, tcon, cfile, inode, set_sparse))
  		return -EOPNOTSUPP;
  
  	cifs_dbg(FYI, "offset %lld len %lld", offset, len);
  
  	fsctl_buf.FileOffset = cpu_to_le64(offset);
  	fsctl_buf.BeyondFinalZero = cpu_to_le64(offset + len);
  
  	rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
  			cfile->fid.volatile_fid, FSCTL_SET_ZERO_DATA,
  			true /* is_fctl */, (char *)&fsctl_buf,
  			sizeof(struct file_zero_data_information), NULL, NULL);
  	free_xid(xid);
  	return rc;
  }

  static long smb3_simple_falloc(struct file *file, struct cifs_tcon *tcon,
  			    loff_t off, loff_t len, bool keep_size)
  {
  	struct inode *inode;
  	struct cifsInodeInfo *cifsi;
  	struct cifsFileInfo *cfile = file->private_data;
  	long rc = -EOPNOTSUPP;
  	unsigned int xid;
  
  	xid = get_xid();

  	inode = d_inode(cfile->dentry);

  	cifsi = CIFS_I(inode);
  
  	/* if file not oplocked can't be sure whether asking to extend size */
  	if (!CIFS_CACHE_READ(cifsi))
  		if (keep_size == false)
  			return -EOPNOTSUPP;
  
  	/*
  	 * Files are non-sparse by default so falloc may be a no-op
  	 * Must check if file sparse. If not sparse, and not extending
  	 * then no need to do anything since file already allocated
  	 */
  	if ((cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE) == 0) {
  		if (keep_size == true)
  			return 0;
  		/* check if extending file */
  		else if (i_size_read(inode) >= off + len)
  			/* not extending file and already not sparse */
  			return 0;
  		/* BB: in future add else clause to extend file */
  		else
  			return -EOPNOTSUPP;
  	}
  
  	if ((keep_size == true) || (i_size_read(inode) >= off + len)) {
  		/*
  		 * Check if falloc starts within first few pages of file
  		 * and ends within a few pages of the end of file to
  		 * ensure that most of file is being forced to be
  		 * fallocated now. If so then setting whole file sparse
  		 * ie potentially making a few extra pages at the beginning
  		 * or end of the file non-sparse via set_sparse is harmless.
  		 */
  		if ((off > 8192) || (off + len + 8192 < i_size_read(inode)))
  			return -EOPNOTSUPP;
  
  		rc = smb2_set_sparse(xid, tcon, cfile, inode, false);
  	}
  	/* BB: else ... in future add code to extend file and set sparse */
  
  
  	free_xid(xid);
  	return rc;
  }

  static long smb3_fallocate(struct file *file, struct cifs_tcon *tcon, int mode,
  			   loff_t off, loff_t len)
  {
  	/* KEEP_SIZE already checked for by do_fallocate */
  	if (mode & FALLOC_FL_PUNCH_HOLE)
  		return smb3_punch_hole(file, tcon, off, len);

  	else if (mode & FALLOC_FL_ZERO_RANGE) {
  		if (mode & FALLOC_FL_KEEP_SIZE)
  			return smb3_zero_range(file, tcon, off, len, true);
  		return smb3_zero_range(file, tcon, off, len, false);

  	} else if (mode == FALLOC_FL_KEEP_SIZE)
  		return smb3_simple_falloc(file, tcon, off, len, true);
  	else if (mode == 0)
  		return smb3_simple_falloc(file, tcon, off, len, false);

  
  	return -EOPNOTSUPP;
  }

  static void

  smb2_downgrade_oplock(struct TCP_Server_Info *server,
  			struct cifsInodeInfo *cinode, bool set_level2)
  {
  	if (set_level2)
  		server->ops->set_oplock_level(cinode, SMB2_OPLOCK_LEVEL_II,
  						0, NULL);
  	else
  		server->ops->set_oplock_level(cinode, 0, 0, NULL);
  }
  
  static void

  smb2_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
  		      unsigned int epoch, bool *purge_cache)

  {
  	oplock &= 0xFF;
  	if (oplock == SMB2_OPLOCK_LEVEL_NOCHANGE)
  		return;
  	if (oplock == SMB2_OPLOCK_LEVEL_BATCH) {

  		cinode->oplock = CIFS_CACHE_RHW_FLG;

  		cifs_dbg(FYI, "Batch Oplock granted on inode %p
  ",
  			 &cinode->vfs_inode);
  	} else if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE) {

  		cinode->oplock = CIFS_CACHE_RW_FLG;

  		cifs_dbg(FYI, "Exclusive Oplock granted on inode %p
  ",
  			 &cinode->vfs_inode);
  	} else if (oplock == SMB2_OPLOCK_LEVEL_II) {
  		cinode->oplock = CIFS_CACHE_READ_FLG;
  		cifs_dbg(FYI, "Level II Oplock granted on inode %p
  ",
  			 &cinode->vfs_inode);
  	} else
  		cinode->oplock = 0;
  }
  
  static void

  smb21_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
  		       unsigned int epoch, bool *purge_cache)

  {
  	char message[5] = {0};
  
  	oplock &= 0xFF;
  	if (oplock == SMB2_OPLOCK_LEVEL_NOCHANGE)
  		return;
  
  	cinode->oplock = 0;
  	if (oplock & SMB2_LEASE_READ_CACHING_HE) {
  		cinode->oplock |= CIFS_CACHE_READ_FLG;
  		strcat(message, "R");
  	}
  	if (oplock & SMB2_LEASE_HANDLE_CACHING_HE) {
  		cinode->oplock |= CIFS_CACHE_HANDLE_FLG;
  		strcat(message, "H");
  	}
  	if (oplock & SMB2_LEASE_WRITE_CACHING_HE) {
  		cinode->oplock |= CIFS_CACHE_WRITE_FLG;
  		strcat(message, "W");
  	}
  	if (!cinode->oplock)
  		strcat(message, "None");
  	cifs_dbg(FYI, "%s Lease granted on inode %p
  ", message,
  		 &cinode->vfs_inode);
  }

  static void
  smb3_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
  		      unsigned int epoch, bool *purge_cache)
  {
  	unsigned int old_oplock = cinode->oplock;
  
  	smb21_set_oplock_level(cinode, oplock, epoch, purge_cache);
  
  	if (purge_cache) {
  		*purge_cache = false;
  		if (old_oplock == CIFS_CACHE_READ_FLG) {
  			if (cinode->oplock == CIFS_CACHE_READ_FLG &&
  			    (epoch - cinode->epoch > 0))
  				*purge_cache = true;
  			else if (cinode->oplock == CIFS_CACHE_RH_FLG &&
  				 (epoch - cinode->epoch > 1))
  				*purge_cache = true;
  			else if (cinode->oplock == CIFS_CACHE_RHW_FLG &&
  				 (epoch - cinode->epoch > 1))
  				*purge_cache = true;
  			else if (cinode->oplock == 0 &&
  				 (epoch - cinode->epoch > 0))
  				*purge_cache = true;
  		} else if (old_oplock == CIFS_CACHE_RH_FLG) {
  			if (cinode->oplock == CIFS_CACHE_RH_FLG &&
  			    (epoch - cinode->epoch > 0))
  				*purge_cache = true;
  			else if (cinode->oplock == CIFS_CACHE_RHW_FLG &&
  				 (epoch - cinode->epoch > 1))
  				*purge_cache = true;
  		}
  		cinode->epoch = epoch;
  	}
  }

  static bool
  smb2_is_read_op(__u32 oplock)
  {
  	return oplock == SMB2_OPLOCK_LEVEL_II;
  }
  
  static bool
  smb21_is_read_op(__u32 oplock)
  {
  	return (oplock & SMB2_LEASE_READ_CACHING_HE) &&
  	       !(oplock & SMB2_LEASE_WRITE_CACHING_HE);
  }

  static __le32
  map_oplock_to_lease(u8 oplock)
  {
  	if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE)
  		return SMB2_LEASE_WRITE_CACHING | SMB2_LEASE_READ_CACHING;
  	else if (oplock == SMB2_OPLOCK_LEVEL_II)
  		return SMB2_LEASE_READ_CACHING;
  	else if (oplock == SMB2_OPLOCK_LEVEL_BATCH)
  		return SMB2_LEASE_HANDLE_CACHING | SMB2_LEASE_READ_CACHING |
  		       SMB2_LEASE_WRITE_CACHING;
  	return 0;
  }

  static char *
  smb2_create_lease_buf(u8 *lease_key, u8 oplock)
  {
  	struct create_lease *buf;
  
  	buf = kzalloc(sizeof(struct create_lease), GFP_KERNEL);
  	if (!buf)
  		return NULL;
  
  	buf->lcontext.LeaseKeyLow = cpu_to_le64(*((u64 *)lease_key));
  	buf->lcontext.LeaseKeyHigh = cpu_to_le64(*((u64 *)(lease_key + 8)));

  	buf->lcontext.LeaseState = map_oplock_to_lease(oplock);

  
  	buf->ccontext.DataOffset = cpu_to_le16(offsetof
  					(struct create_lease, lcontext));
  	buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context));
  	buf->ccontext.NameOffset = cpu_to_le16(offsetof
  				(struct create_lease, Name));
  	buf->ccontext.NameLength = cpu_to_le16(4);

  	/* SMB2_CREATE_REQUEST_LEASE is "RqLs" */

  	buf->Name[0] = 'R';
  	buf->Name[1] = 'q';
  	buf->Name[2] = 'L';
  	buf->Name[3] = 's';
  	return (char *)buf;
  }

  static char *
  smb3_create_lease_buf(u8 *lease_key, u8 oplock)
  {
  	struct create_lease_v2 *buf;
  
  	buf = kzalloc(sizeof(struct create_lease_v2), GFP_KERNEL);
  	if (!buf)
  		return NULL;
  
  	buf->lcontext.LeaseKeyLow = cpu_to_le64(*((u64 *)lease_key));
  	buf->lcontext.LeaseKeyHigh = cpu_to_le64(*((u64 *)(lease_key + 8)));
  	buf->lcontext.LeaseState = map_oplock_to_lease(oplock);
  
  	buf->ccontext.DataOffset = cpu_to_le16(offsetof
  					(struct create_lease_v2, lcontext));
  	buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context_v2));
  	buf->ccontext.NameOffset = cpu_to_le16(offsetof
  				(struct create_lease_v2, Name));
  	buf->ccontext.NameLength = cpu_to_le16(4);

  	/* SMB2_CREATE_REQUEST_LEASE is "RqLs" */

  	buf->Name[0] = 'R';
  	buf->Name[1] = 'q';
  	buf->Name[2] = 'L';
  	buf->Name[3] = 's';
  	return (char *)buf;
  }

  static __u8

  smb2_parse_lease_buf(void *buf, unsigned int *epoch)

  {
  	struct create_lease *lc = (struct create_lease *)buf;

  	*epoch = 0; /* not used */

  	if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS)
  		return SMB2_OPLOCK_LEVEL_NOCHANGE;
  	return le32_to_cpu(lc->lcontext.LeaseState);
  }

  static __u8

  smb3_parse_lease_buf(void *buf, unsigned int *epoch)

  {
  	struct create_lease_v2 *lc = (struct create_lease_v2 *)buf;

  	*epoch = le16_to_cpu(lc->lcontext.Epoch);

  	if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS)
  		return SMB2_OPLOCK_LEVEL_NOCHANGE;
  	return le32_to_cpu(lc->lcontext.LeaseState);
  }

  static unsigned int
  smb2_wp_retry_size(struct inode *inode)
  {
  	return min_t(unsigned int, CIFS_SB(inode->i_sb)->wsize,
  		     SMB2_MAX_BUFFER_SIZE);
  }

  static bool
  smb2_dir_needs_close(struct cifsFileInfo *cfile)
  {
  	return !cfile->invalidHandle;
  }

  struct smb_version_operations smb20_operations = {

  	.compare_fids = smb2_compare_fids,

  	.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,

  	.wait_mtu_credits = cifs_wait_mtu_credits,

  	.get_next_mid = smb2_get_next_mid,

  	.read_data_offset = smb2_read_data_offset,
  	.read_data_length = smb2_read_data_length,
  	.map_error = map_smb2_to_linux_error,

  	.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,

  	.is_oplock_break = smb2_is_valid_oplock_break,

  	.downgrade_oplock = smb2_downgrade_oplock,

  	.need_neg = smb2_need_neg,
  	.negotiate = smb2_negotiate,

  	.negotiate_wsize = smb2_negotiate_wsize,
  	.negotiate_rsize = smb2_negotiate_rsize,

  	.sess_setup = SMB2_sess_setup,
  	.logoff = SMB2_logoff,

  	.tree_connect = SMB2_tcon,
  	.tree_disconnect = SMB2_tdis,

  	.qfs_tcon = smb2_qfs_tcon,

  	.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,

  	.query_file_info = smb2_query_file_info,

  	.set_path_size = smb2_set_path_size,
  	.set_file_size = smb2_set_file_size,

  	.set_file_info = smb2_set_file_info,

  	.set_compression = smb2_set_compression,

  	.mkdir = smb2_mkdir,
  	.mkdir_setinfo = smb2_mkdir_setinfo,

  	.rmdir = smb2_rmdir,

  	.unlink = smb2_unlink,

  	.rename = smb2_rename_path,

  	.create_hardlink = smb2_create_hardlink,

  	.query_symlink = smb2_query_symlink,

  	.query_mf_symlink = smb3_query_mf_symlink,
  	.create_mf_symlink = smb3_create_mf_symlink,

  	.open = smb2_open_file,
  	.set_fid = smb2_set_fid,
  	.close = smb2_close_file,

  	.flush = smb2_flush_file,

  	.async_readv = smb2_async_readv,

  	.async_writev = smb2_async_writev,

  	.sync_read = smb2_sync_read,

  	.sync_write = smb2_sync_write,

  	.query_dir_first = smb2_query_dir_first,
  	.query_dir_next = smb2_query_dir_next,
  	.close_dir = smb2_close_dir,
  	.calc_smb_size = smb2_calc_size,

  	.is_status_pending = smb2_is_status_pending,

  	.oplock_response = smb2_oplock_response,

  	.queryfs = smb2_queryfs,

  	.mand_lock = smb2_mand_lock,
  	.mand_unlock_range = smb2_unlock_range,

  	.push_mand_locks = smb2_push_mandatory_locks,

  	.get_lease_key = smb2_get_lease_key,
  	.set_lease_key = smb2_set_lease_key,
  	.new_lease_key = smb2_new_lease_key,

  	.calc_signature = smb2_calc_signature,

  	.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,

  	.clone_range = smb2_clone_range,

  	.wp_retry_size = smb2_wp_retry_size,

  	.dir_needs_close = smb2_dir_needs_close,

  };

  struct smb_version_operations smb21_operations = {
  	.compare_fids = smb2_compare_fids,
  	.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,

  	.wait_mtu_credits = smb2_wait_mtu_credits,

  	.get_next_mid = smb2_get_next_mid,
  	.read_data_offset = smb2_read_data_offset,
  	.read_data_length = smb2_read_data_length,
  	.map_error = map_smb2_to_linux_error,
  	.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,
  	.is_oplock_break = smb2_is_valid_oplock_break,

  	.downgrade_oplock = smb2_downgrade_oplock,

  	.need_neg = smb2_need_neg,
  	.negotiate = smb2_negotiate,
  	.negotiate_wsize = smb2_negotiate_wsize,
  	.negotiate_rsize = smb2_negotiate_rsize,
  	.sess_setup = SMB2_sess_setup,
  	.logoff = SMB2_logoff,
  	.tree_connect = SMB2_tcon,
  	.tree_disconnect = SMB2_tdis,

  	.qfs_tcon = smb2_qfs_tcon,

  	.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,
  	.query_file_info = smb2_query_file_info,
  	.set_path_size = smb2_set_path_size,
  	.set_file_size = smb2_set_file_size,
  	.set_file_info = smb2_set_file_info,

  	.set_compression = smb2_set_compression,

  	.mkdir = smb2_mkdir,
  	.mkdir_setinfo = smb2_mkdir_setinfo,
  	.rmdir = smb2_rmdir,
  	.unlink = smb2_unlink,
  	.rename = smb2_rename_path,
  	.create_hardlink = smb2_create_hardlink,
  	.query_symlink = smb2_query_symlink,

  	.query_mf_symlink = smb3_query_mf_symlink,

  	.create_mf_symlink = smb3_create_mf_symlink,

  	.open = smb2_open_file,
  	.set_fid = smb2_set_fid,
  	.close = smb2_close_file,
  	.flush = smb2_flush_file,
  	.async_readv = smb2_async_readv,
  	.async_writev = smb2_async_writev,
  	.sync_read = smb2_sync_read,
  	.sync_write = smb2_sync_write,
  	.query_dir_first = smb2_query_dir_first,
  	.query_dir_next = smb2_query_dir_next,
  	.close_dir = smb2_close_dir,
  	.calc_smb_size = smb2_calc_size,
  	.is_status_pending = smb2_is_status_pending,
  	.oplock_response = smb2_oplock_response,
  	.queryfs = smb2_queryfs,
  	.mand_lock = smb2_mand_lock,
  	.mand_unlock_range = smb2_unlock_range,
  	.push_mand_locks = smb2_push_mandatory_locks,
  	.get_lease_key = smb2_get_lease_key,
  	.set_lease_key = smb2_set_lease_key,
  	.new_lease_key = smb2_new_lease_key,
  	.calc_signature = smb2_calc_signature,
  	.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,

  	.clone_range = smb2_clone_range,

  	.wp_retry_size = smb2_wp_retry_size,

  	.dir_needs_close = smb2_dir_needs_close,

  	.enum_snapshots = smb3_enum_snapshots,

  };

  
  struct smb_version_operations smb30_operations = {
  	.compare_fids = smb2_compare_fids,
  	.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,

  	.wait_mtu_credits = smb2_wait_mtu_credits,

  	.get_next_mid = smb2_get_next_mid,
  	.read_data_offset = smb2_read_data_offset,
  	.read_data_length = smb2_read_data_length,
  	.map_error = map_smb2_to_linux_error,
  	.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,

  	.dump_share_caps = smb2_dump_share_caps,

  	.is_oplock_break = smb2_is_valid_oplock_break,

  	.downgrade_oplock = smb2_downgrade_oplock,

  	.need_neg = smb2_need_neg,
  	.negotiate = smb2_negotiate,
  	.negotiate_wsize = smb2_negotiate_wsize,
  	.negotiate_rsize = smb2_negotiate_rsize,
  	.sess_setup = SMB2_sess_setup,
  	.logoff = SMB2_logoff,
  	.tree_connect = SMB2_tcon,
  	.tree_disconnect = SMB2_tdis,

  	.qfs_tcon = smb3_qfs_tcon,

  	.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,
  	.query_file_info = smb2_query_file_info,
  	.set_path_size = smb2_set_path_size,
  	.set_file_size = smb2_set_file_size,
  	.set_file_info = smb2_set_file_info,

  	.set_compression = smb2_set_compression,

  	.mkdir = smb2_mkdir,
  	.mkdir_setinfo = smb2_mkdir_setinfo,
  	.rmdir = smb2_rmdir,
  	.unlink = smb2_unlink,
  	.rename = smb2_rename_path,
  	.create_hardlink = smb2_create_hardlink,

  	.query_symlink = smb2_query_symlink,

  	.query_mf_symlink = smb3_query_mf_symlink,

  	.create_mf_symlink = smb3_create_mf_symlink,

  	.open = smb2_open_file,
  	.set_fid = smb2_set_fid,
  	.close = smb2_close_file,
  	.flush = smb2_flush_file,
  	.async_readv = smb2_async_readv,
  	.async_writev = smb2_async_writev,
  	.sync_read = smb2_sync_read,
  	.sync_write = smb2_sync_write,
  	.query_dir_first = smb2_query_dir_first,
  	.query_dir_next = smb2_query_dir_next,
  	.close_dir = smb2_close_dir,
  	.calc_smb_size = smb2_calc_size,
  	.is_status_pending = smb2_is_status_pending,
  	.oplock_response = smb2_oplock_response,
  	.queryfs = smb2_queryfs,
  	.mand_lock = smb2_mand_lock,
  	.mand_unlock_range = smb2_unlock_range,
  	.push_mand_locks = smb2_push_mandatory_locks,
  	.get_lease_key = smb2_get_lease_key,
  	.set_lease_key = smb2_set_lease_key,
  	.new_lease_key = smb2_new_lease_key,

  	.generate_signingkey = generate_smb30signingkey,

  	.calc_signature = smb3_calc_signature,

  	.set_integrity  = smb3_set_integrity,

  	.is_read_op = smb21_is_read_op,

  	.set_oplock_level = smb3_set_oplock_level,

  	.create_lease_buf = smb3_create_lease_buf,
  	.parse_lease_buf = smb3_parse_lease_buf,

  	.clone_range = smb2_clone_range,

  	.duplicate_extents = smb2_duplicate_extents,

  	.validate_negotiate = smb3_validate_negotiate,

  	.wp_retry_size = smb2_wp_retry_size,

  	.dir_needs_close = smb2_dir_needs_close,

  	.fallocate = smb3_fallocate,

  	.enum_snapshots = smb3_enum_snapshots,

  };

  #ifdef CONFIG_CIFS_SMB311
  struct smb_version_operations smb311_operations = {
  	.compare_fids = smb2_compare_fids,
  	.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,
  	.wait_mtu_credits = smb2_wait_mtu_credits,
  	.get_next_mid = smb2_get_next_mid,
  	.read_data_offset = smb2_read_data_offset,
  	.read_data_length = smb2_read_data_length,
  	.map_error = map_smb2_to_linux_error,
  	.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,
  	.dump_share_caps = smb2_dump_share_caps,
  	.is_oplock_break = smb2_is_valid_oplock_break,
  	.downgrade_oplock = smb2_downgrade_oplock,
  	.need_neg = smb2_need_neg,
  	.negotiate = smb2_negotiate,
  	.negotiate_wsize = smb2_negotiate_wsize,
  	.negotiate_rsize = smb2_negotiate_rsize,
  	.sess_setup = SMB2_sess_setup,
  	.logoff = SMB2_logoff,
  	.tree_connect = SMB2_tcon,
  	.tree_disconnect = SMB2_tdis,
  	.qfs_tcon = smb3_qfs_tcon,
  	.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,
  	.query_file_info = smb2_query_file_info,
  	.set_path_size = smb2_set_path_size,
  	.set_file_size = smb2_set_file_size,
  	.set_file_info = smb2_set_file_info,
  	.set_compression = smb2_set_compression,
  	.mkdir = smb2_mkdir,
  	.mkdir_setinfo = smb2_mkdir_setinfo,
  	.rmdir = smb2_rmdir,
  	.unlink = smb2_unlink,
  	.rename = smb2_rename_path,
  	.create_hardlink = smb2_create_hardlink,
  	.query_symlink = smb2_query_symlink,
  	.query_mf_symlink = smb3_query_mf_symlink,
  	.create_mf_symlink = smb3_create_mf_symlink,
  	.open = smb2_open_file,
  	.set_fid = smb2_set_fid,
  	.close = smb2_close_file,
  	.flush = smb2_flush_file,
  	.async_readv = smb2_async_readv,
  	.async_writev = smb2_async_writev,
  	.sync_read = smb2_sync_read,
  	.sync_write = smb2_sync_write,
  	.query_dir_first = smb2_query_dir_first,
  	.query_dir_next = smb2_query_dir_next,
  	.close_dir = smb2_close_dir,
  	.calc_smb_size = smb2_calc_size,
  	.is_status_pending = smb2_is_status_pending,
  	.oplock_response = smb2_oplock_response,
  	.queryfs = smb2_queryfs,
  	.mand_lock = smb2_mand_lock,
  	.mand_unlock_range = smb2_unlock_range,
  	.push_mand_locks = smb2_push_mandatory_locks,
  	.get_lease_key = smb2_get_lease_key,
  	.set_lease_key = smb2_set_lease_key,
  	.new_lease_key = smb2_new_lease_key,

  	.generate_signingkey = generate_smb311signingkey,

  	.calc_signature = smb3_calc_signature,

  	.set_integrity  = smb3_set_integrity,

  	.is_read_op = smb21_is_read_op,
  	.set_oplock_level = smb3_set_oplock_level,
  	.create_lease_buf = smb3_create_lease_buf,
  	.parse_lease_buf = smb3_parse_lease_buf,
  	.clone_range = smb2_clone_range,

  	.duplicate_extents = smb2_duplicate_extents,

  /*	.validate_negotiate = smb3_validate_negotiate, */ /* not used in 3.11 */
  	.wp_retry_size = smb2_wp_retry_size,
  	.dir_needs_close = smb2_dir_needs_close,
  	.fallocate = smb3_fallocate,

  	.enum_snapshots = smb3_enum_snapshots,

  };
  #endif /* CIFS_SMB311 */

  struct smb_version_values smb20_values = {
  	.version_string = SMB20_VERSION_STRING,
  	.protocol_id = SMB20_PROT_ID,
  	.req_capabilities = 0, /* MBZ */
  	.large_lock_type = 0,
  	.exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
  	.shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
  	.unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
  	.header_size = sizeof(struct smb2_hdr),
  	.max_header_size = MAX_SMB2_HDR_SIZE,
  	.read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
  	.lock_cmd = SMB2_LOCK,
  	.cap_unix = 0,
  	.cap_nt_find = SMB2_NT_FIND,
  	.cap_large_files = SMB2_LARGE_FILES,

  	.signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
  	.signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,

  	.create_lease_size = sizeof(struct create_lease),

  };

  struct smb_version_values smb21_values = {
  	.version_string = SMB21_VERSION_STRING,

  	.protocol_id = SMB21_PROT_ID,
  	.req_capabilities = 0, /* MBZ on negotiate req until SMB3 dialect */
  	.large_lock_type = 0,
  	.exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
  	.shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
  	.unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
  	.header_size = sizeof(struct smb2_hdr),
  	.max_header_size = MAX_SMB2_HDR_SIZE,
  	.read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
  	.lock_cmd = SMB2_LOCK,
  	.cap_unix = 0,
  	.cap_nt_find = SMB2_NT_FIND,
  	.cap_large_files = SMB2_LARGE_FILES,

  	.signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
  	.signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,

  	.create_lease_size = sizeof(struct create_lease),

  };
  
  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,

  	.large_lock_type = 0,
  	.exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
  	.shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
  	.unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,

  	.header_size = sizeof(struct smb2_hdr),
  	.max_header_size = MAX_SMB2_HDR_SIZE,

  	.read_rsp_size = sizeof(struct smb2_read_rsp) - 1,

  	.lock_cmd = SMB2_LOCK,

  	.cap_unix = 0,
  	.cap_nt_find = SMB2_NT_FIND,
  	.cap_large_files = SMB2_LARGE_FILES,

  	.signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
  	.signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,

  	.create_lease_size = sizeof(struct create_lease_v2),

  };

  
  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,

  	.large_lock_type = 0,
  	.exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
  	.shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
  	.unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
  	.header_size = sizeof(struct smb2_hdr),
  	.max_header_size = MAX_SMB2_HDR_SIZE,
  	.read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
  	.lock_cmd = SMB2_LOCK,
  	.cap_unix = 0,
  	.cap_nt_find = SMB2_NT_FIND,
  	.cap_large_files = SMB2_LARGE_FILES,

  	.signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
  	.signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,

  	.create_lease_size = sizeof(struct create_lease_v2),

  };

  
  #ifdef CONFIG_CIFS_SMB311
  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,

  	.large_lock_type = 0,
  	.exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
  	.shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
  	.unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
  	.header_size = sizeof(struct smb2_hdr),
  	.max_header_size = MAX_SMB2_HDR_SIZE,
  	.read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
  	.lock_cmd = SMB2_LOCK,
  	.cap_unix = 0,
  	.cap_nt_find = SMB2_NT_FIND,
  	.cap_large_files = SMB2_LARGE_FILES,
  	.signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
  	.signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
  	.create_lease_size = sizeof(struct create_lease_v2),
  };
  #endif /* SMB311 */