TOMOYO Linux Cross Reference
Linux/fs/cifs/smb2pdu.c

   /*
    *   fs/cifs/smb2pdu.c
    *
    *   Copyright (C) International Business Machines  Corp., 2009, 2013
    *                 Etersoft, 2012
    *   Author(s): Steve French (sfrench@us.ibm.com)
    *              Pavel Shilovsky (pshilovsky@samba.org) 2012
    *
    *   Contains the routines for constructing the SMB2 PDUs themselves
   *
   *   This library is free software; you can redistribute it and/or modify
   *   it under the terms of the GNU Lesser General Public License as published
   *   by the Free Software Foundation; either version 2.1 of the License, or
   *   (at your option) any later version.
   *
   *   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
   */
  
   /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */
   /* Note that there are handle based routines which must be                   */
   /* treated slightly differently for reconnection purposes since we never     */
   /* want to reuse a stale file handle and only the caller knows the file info */
  
  #include <linux/fs.h>
  #include <linux/kernel.h>
  #include <linux/vfs.h>
  #include <linux/task_io_accounting_ops.h>
  #include <linux/uaccess.h>
  #include <linux/pagemap.h>
  #include <linux/xattr.h>
  #include "smb2pdu.h"
  #include "cifsglob.h"
  #include "cifsacl.h"
  #include "cifsproto.h"
  #include "smb2proto.h"
  #include "cifs_unicode.h"
  #include "cifs_debug.h"
  #include "ntlmssp.h"
  #include "smb2status.h"
  #include "smb2glob.h"
  #include "cifspdu.h"
  
  /*
   *  The following table defines the expected "StructureSize" of SMB2 requests
   *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS requests.
   *
   *  Note that commands are defined in smb2pdu.h in le16 but the array below is
   *  indexed by command in host byte order.
   */
  static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
          /* SMB2_NEGOTIATE */ 36,
          /* SMB2_SESSION_SETUP */ 25,
          /* SMB2_LOGOFF */ 4,
          /* SMB2_TREE_CONNECT */ 9,
          /* SMB2_TREE_DISCONNECT */ 4,
          /* SMB2_CREATE */ 57,
          /* SMB2_CLOSE */ 24,
          /* SMB2_FLUSH */ 24,
          /* SMB2_READ */ 49,
          /* SMB2_WRITE */ 49,
          /* SMB2_LOCK */ 48,
          /* SMB2_IOCTL */ 57,
          /* SMB2_CANCEL */ 4,
          /* SMB2_ECHO */ 4,
          /* SMB2_QUERY_DIRECTORY */ 33,
          /* SMB2_CHANGE_NOTIFY */ 32,
          /* SMB2_QUERY_INFO */ 41,
          /* SMB2_SET_INFO */ 33,
          /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
  };
  
  
  static void
  smb2_hdr_assemble(struct smb2_hdr *hdr, __le16 smb2_cmd /* command */ ,
                    const struct cifs_tcon *tcon)
  {
          struct smb2_pdu *pdu = (struct smb2_pdu *)hdr;
          char *temp = (char *)hdr;
          /* lookup word count ie StructureSize from table */
          __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_cmd)];
  
          /*
           * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
           * largest operations (Create)
           */
          memset(temp, 0, 256);
  
          /* Note this is only network field converted to big endian */
          hdr->smb2_buf_length = cpu_to_be32(parmsize + sizeof(struct smb2_hdr)
                          - 4 /*  RFC 1001 length field itself not counted */);
  
          hdr->ProtocolId[0] = 0xFE;
         hdr->ProtocolId[1] = 'S';
         hdr->ProtocolId[2] = 'M';
         hdr->ProtocolId[3] = 'B';
         hdr->StructureSize = cpu_to_le16(64);
         hdr->Command = smb2_cmd;
         hdr->CreditRequest = cpu_to_le16(2); /* BB make this dynamic */
         hdr->ProcessId = cpu_to_le32((__u16)current->tgid);
 
         if (!tcon)
                 goto out;
 
         /* BB FIXME when we do write > 64K add +1 for every 64K in req or rsp */
         /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
         /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
         if ((tcon->ses) &&
             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
                 hdr->CreditCharge = cpu_to_le16(1);
         /* else CreditCharge MBZ */
 
         hdr->TreeId = tcon->tid;
         /* Uid is not converted */
         if (tcon->ses)
                 hdr->SessionId = tcon->ses->Suid;
 
         /*
          * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
          * to pass the path on the Open SMB prefixed by \\server\share.
          * Not sure when we would need to do the augmented path (if ever) and
          * setting this flag breaks the SMB2 open operation since it is
          * illegal to send an empty path name (without \\server\share prefix)
          * when the DFS flag is set in the SMB open header. We could
          * consider setting the flag on all operations other than open
          * but it is safer to net set it for now.
          */
 /*      if (tcon->share_flags & SHI1005_FLAGS_DFS)
                 hdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
 
         if (tcon->ses && tcon->ses->server && tcon->ses->server->sign)
                 hdr->Flags |= SMB2_FLAGS_SIGNED;
 out:
         pdu->StructureSize2 = cpu_to_le16(parmsize);
         return;
 }
 
 static int
 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
 {
         int rc = 0;
         struct nls_table *nls_codepage;
         struct cifs_ses *ses;
         struct TCP_Server_Info *server;
 
         /*
          * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
          * check for tcp and smb session status done differently
          * for those three - in the calling routine.
          */
         if (tcon == NULL)
                 return rc;
 
         if (smb2_command == SMB2_TREE_CONNECT)
                 return rc;
 
         if (tcon->tidStatus == CifsExiting) {
                 /*
                  * only tree disconnect, open, and write,
                  * (and ulogoff which does not have tcon)
                  * are allowed as we start force umount.
                  */
                 if ((smb2_command != SMB2_WRITE) &&
                    (smb2_command != SMB2_CREATE) &&
                    (smb2_command != SMB2_TREE_DISCONNECT)) {
                         cifs_dbg(FYI, "can not send cmd %d while umounting\n",
                                  smb2_command);
                         return -ENODEV;
                 }
         }
         if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
             (!tcon->ses->server))
                 return -EIO;
 
         ses = tcon->ses;
         server = ses->server;
 
         /*
          * Give demultiplex thread up to 10 seconds to reconnect, should be
          * greater than cifs socket timeout which is 7 seconds
          */
         while (server->tcpStatus == CifsNeedReconnect) {
                 /*
                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
                  * here since they are implicitly done when session drops.
                  */
                 switch (smb2_command) {
                 /*
                  * BB Should we keep oplock break and add flush to exceptions?
                  */
                 case SMB2_TREE_DISCONNECT:
                 case SMB2_CANCEL:
                 case SMB2_CLOSE:
                 case SMB2_OPLOCK_BREAK:
                         return -EAGAIN;
                 }
 
                 wait_event_interruptible_timeout(server->response_q,
                         (server->tcpStatus != CifsNeedReconnect), 10 * HZ);
 
                 /* are we still trying to reconnect? */
                 if (server->tcpStatus != CifsNeedReconnect)
                         break;
 
                 /*
                  * on "soft" mounts we wait once. Hard mounts keep
                  * retrying until process is killed or server comes
                  * back on-line
                  */
                 if (!tcon->retry) {
                         cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
                         return -EHOSTDOWN;
                 }
         }
 
         if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
                 return rc;
 
         nls_codepage = load_nls_default();
 
         /*
          * need to prevent multiple threads trying to simultaneously reconnect
          * the same SMB session
          */
         mutex_lock(&tcon->ses->session_mutex);
         rc = cifs_negotiate_protocol(0, tcon->ses);
         if (!rc && tcon->ses->need_reconnect)
                 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
 
         if (rc || !tcon->need_reconnect) {
                 mutex_unlock(&tcon->ses->session_mutex);
                 goto out;
         }
 
         cifs_mark_open_files_invalid(tcon);
         rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nls_codepage);
         mutex_unlock(&tcon->ses->session_mutex);
         cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
         if (rc)
                 goto out;
         atomic_inc(&tconInfoReconnectCount);
         /*
          * BB FIXME add code to check if wsize needs update due to negotiated
          * smb buffer size shrinking.
          */
 out:
         /*
          * Check if handle based operation so we know whether we can continue
          * or not without returning to caller to reset file handle.
          */
         /*
          * BB Is flush done by server on drop of tcp session? Should we special
          * case it and skip above?
          */
         switch (smb2_command) {
         case SMB2_FLUSH:
         case SMB2_READ:
         case SMB2_WRITE:
         case SMB2_LOCK:
         case SMB2_IOCTL:
         case SMB2_QUERY_DIRECTORY:
         case SMB2_CHANGE_NOTIFY:
         case SMB2_QUERY_INFO:
         case SMB2_SET_INFO:
                 return -EAGAIN;
         }
         unload_nls(nls_codepage);
         return rc;
 }
 
 /*
  * Allocate and return pointer to an SMB request hdr, and set basic
  * SMB information in the SMB header. If the return code is zero, this
  * function must have filled in request_buf pointer.
  */
 static int
 small_smb2_init(__le16 smb2_command, struct cifs_tcon *tcon,
                 void **request_buf)
 {
         int rc = 0;
 
         rc = smb2_reconnect(smb2_command, tcon);
         if (rc)
                 return rc;
 
         /* BB eventually switch this to SMB2 specific small buf size */
         *request_buf = cifs_small_buf_get();
         if (*request_buf == NULL) {
                 /* BB should we add a retry in here if not a writepage? */
                 return -ENOMEM;
         }
 
         smb2_hdr_assemble((struct smb2_hdr *) *request_buf, smb2_command, tcon);
 
         if (tcon != NULL) {
 #ifdef CONFIG_CIFS_STATS2
                 uint16_t com_code = le16_to_cpu(smb2_command);
                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 #endif
                 cifs_stats_inc(&tcon->num_smbs_sent);
         }
 
         return rc;
 }
 
 static void
 free_rsp_buf(int resp_buftype, void *rsp)
 {
         if (resp_buftype == CIFS_SMALL_BUFFER)
                 cifs_small_buf_release(rsp);
         else if (resp_buftype == CIFS_LARGE_BUFFER)
                 cifs_buf_release(rsp);
 }
 
 
 /*
  *
  *      SMB2 Worker functions follow:
  *
  *      The general structure of the worker functions is:
  *      1) Call smb2_init (assembles SMB2 header)
  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
  *      4) Decode SMB2 command specific fields in the fixed length area
  *      5) Decode variable length data area (if any for this SMB2 command type)
  *      6) Call free smb buffer
  *      7) return
  *
  */
 
 int
 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 {
         struct smb2_negotiate_req *req;
         struct smb2_negotiate_rsp *rsp;
         struct kvec iov[1];
         int rc = 0;
         int resp_buftype;
         struct TCP_Server_Info *server = ses->server;
         int blob_offset, blob_length;
         char *security_blob;
         int flags = CIFS_NEG_OP;
 
         cifs_dbg(FYI, "Negotiate protocol\n");
 
         if (!server) {
                 WARN(1, "%s: server is NULL!\n", __func__);
                 return -EIO;
         }
 
         rc = small_smb2_init(SMB2_NEGOTIATE, NULL, (void **) &req);
         if (rc)
                 return rc;
 
         req->hdr.SessionId = 0;
 
         req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
 
         req->DialectCount = cpu_to_le16(1); /* One vers= at a time for now */
         inc_rfc1001_len(req, 2);
 
         /* only one of SMB2 signing flags may be set in SMB2 request */
         if (ses->sign)
                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
         else if (global_secflags & CIFSSEC_MAY_SIGN)
                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
         else
                 req->SecurityMode = 0;
 
         req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
 
         memcpy(req->ClientGUID, cifs_client_guid, SMB2_CLIENT_GUID_SIZE);
 
         iov[0].iov_base = (char *)req;
         /* 4 for rfc1002 length field */
         iov[0].iov_len = get_rfc1002_length(req) + 4;
 
         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags);
 
         rsp = (struct smb2_negotiate_rsp *)iov[0].iov_base;
         /*
          * No tcon so can't do
          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
          */
         if (rc != 0)
                 goto neg_exit;
 
         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
 
         /* BB we may eventually want to match the negotiated vs. requested
            dialect, even though we are only requesting one at a time */
         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
         else {
                 cifs_dbg(VFS, "Illegal dialect returned by server %d\n",
                          le16_to_cpu(rsp->DialectRevision));
                 rc = -EIO;
                 goto neg_exit;
         }
         server->dialect = le16_to_cpu(rsp->DialectRevision);
 
         /* SMB2 only has an extended negflavor */
         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
         /* set it to the maximum buffer size value we can send with 1 credit */
         server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
                                SMB2_MAX_BUFFER_SIZE);
         server->max_read = le32_to_cpu(rsp->MaxReadSize);
         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
         /* BB Do we need to validate the SecurityMode? */
         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
         server->capabilities = le32_to_cpu(rsp->Capabilities);
         /* Internal types */
         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
 
         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
                                                &rsp->hdr);
         /*
          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
          * for us will be
          *      ses->sectype = RawNTLMSSP;
          * but for time being this is our only auth choice so doesn't matter.
          * We just found a server which sets blob length to zero expecting raw.
          */
         if (blob_length == 0)
                 cifs_dbg(FYI, "missing security blob on negprot\n");
 
         rc = cifs_enable_signing(server, ses->sign);
 #ifdef CONFIG_SMB2_ASN1  /* BB REMOVEME when updated asn1.c ready */
         if (rc)
                 goto neg_exit;
         if (blob_length)
                 rc = decode_neg_token_init(security_blob, blob_length,
                                    &server->sec_type);
         if (rc == 1)
                 rc = 0;
         else if (rc == 0) {
                 rc = -EIO;
                 goto neg_exit;
         }
 #endif
 
 neg_exit:
         free_rsp_buf(resp_buftype, rsp);
         return rc;
 }
 
 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
 {
         int rc = 0;
         struct validate_negotiate_info_req vneg_inbuf;
         struct validate_negotiate_info_rsp *pneg_rsp;
         u32 rsplen;
 
         cifs_dbg(FYI, "validate negotiate\n");
 
         /*
          * validation ioctl must be signed, so no point sending this if we
          * can not sign it.  We could eventually change this to selectively
          * sign just this, the first and only signed request on a connection.
          * This is good enough for now since a user who wants better security
          * would also enable signing on the mount. Having validation of
          * negotiate info for signed connections helps reduce attack vectors
          */
         if (tcon->ses->server->sign == false)
                 return 0; /* validation requires signing */
 
         vneg_inbuf.Capabilities =
                         cpu_to_le32(tcon->ses->server->vals->req_capabilities);
         memcpy(vneg_inbuf.Guid, cifs_client_guid, SMB2_CLIENT_GUID_SIZE);
 
         if (tcon->ses->sign)
                 vneg_inbuf.SecurityMode =
                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
         else if (global_secflags & CIFSSEC_MAY_SIGN)
                 vneg_inbuf.SecurityMode =
                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
         else
                 vneg_inbuf.SecurityMode = 0;
 
         vneg_inbuf.DialectCount = cpu_to_le16(1);
         vneg_inbuf.Dialects[0] =
                 cpu_to_le16(tcon->ses->server->vals->protocol_id);
 
         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
                 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
                 (char *)&vneg_inbuf, sizeof(struct validate_negotiate_info_req),
                 (char **)&pneg_rsp, &rsplen);
 
         if (rc != 0) {
                 cifs_dbg(VFS, "validate protocol negotiate failed: %d\n", rc);
                 return -EIO;
         }
 
         if (rsplen != sizeof(struct validate_negotiate_info_rsp)) {
                 cifs_dbg(VFS, "invalid size of protocol negotiate response\n");
                 return -EIO;
         }
 
         /* check validate negotiate info response matches what we got earlier */
         if (pneg_rsp->Dialect !=
                         cpu_to_le16(tcon->ses->server->vals->protocol_id))
                 goto vneg_out;
 
         if (pneg_rsp->SecurityMode != cpu_to_le16(tcon->ses->server->sec_mode))
                 goto vneg_out;
 
         /* do not validate server guid because not saved at negprot time yet */
 
         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
               SMB2_LARGE_FILES) != tcon->ses->server->capabilities)
                 goto vneg_out;
 
         /* validate negotiate successful */
         cifs_dbg(FYI, "validate negotiate info successful\n");
         return 0;
 
 vneg_out:
         cifs_dbg(VFS, "protocol revalidation - security settings mismatch\n");
         return -EIO;
 }
 
 int
 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
                 const struct nls_table *nls_cp)
 {
         struct smb2_sess_setup_req *req;
         struct smb2_sess_setup_rsp *rsp = NULL;
         struct kvec iov[2];
         int rc = 0;
         int resp_buftype;
         __le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */
         struct TCP_Server_Info *server = ses->server;
         u16 blob_length = 0;
         char *security_blob;
         char *ntlmssp_blob = NULL;
         bool use_spnego = false; /* else use raw ntlmssp */
 
         cifs_dbg(FYI, "Session Setup\n");
 
         if (!server) {
                 WARN(1, "%s: server is NULL!\n", __func__);
                 return -EIO;
         }
 
         /*
          * If we are here due to reconnect, free per-smb session key
          * in case signing was required.
          */
         kfree(ses->auth_key.response);
         ses->auth_key.response = NULL;
 
         /*
          * If memory allocation is successful, caller of this function
          * frees it.
          */
         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
         if (!ses->ntlmssp)
                 return -ENOMEM;
         ses->ntlmssp->sesskey_per_smbsess = true;
 
         /* FIXME: allow for other auth types besides NTLMSSP (e.g. krb5) */
         ses->sectype = RawNTLMSSP;
 
 ssetup_ntlmssp_authenticate:
         if (phase == NtLmChallenge)
                 phase = NtLmAuthenticate; /* if ntlmssp, now final phase */
 
         rc = small_smb2_init(SMB2_SESSION_SETUP, NULL, (void **) &req);
         if (rc)
                 return rc;
 
         req->hdr.SessionId = 0; /* First session, not a reauthenticate */
         req->VcNumber = 0; /* MBZ */
         /* to enable echos and oplocks */
         req->hdr.CreditRequest = cpu_to_le16(3);
 
         /* only one of SMB2 signing flags may be set in SMB2 request */
         if (server->sign)
                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
         else
                 req->SecurityMode = 0;
 
         req->Capabilities = 0;
         req->Channel = 0; /* MBZ */
 
         iov[0].iov_base = (char *)req;
         /* 4 for rfc1002 length field and 1 for pad */
         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
         if (phase == NtLmNegotiate) {
                 ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
                                        GFP_KERNEL);
                 if (ntlmssp_blob == NULL) {
                         rc = -ENOMEM;
                         goto ssetup_exit;
                 }
                 build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
                 if (use_spnego) {
                         /* blob_length = build_spnego_ntlmssp_blob(
                                         &security_blob,
                                         sizeof(struct _NEGOTIATE_MESSAGE),
                                         ntlmssp_blob); */
                         /* BB eventually need to add this */
                         cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
                         rc = -EOPNOTSUPP;
                         kfree(ntlmssp_blob);
                         goto ssetup_exit;
                 } else {
                         blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
                         /* with raw NTLMSSP we don't encapsulate in SPNEGO */
                         security_blob = ntlmssp_blob;
                 }
         } else if (phase == NtLmAuthenticate) {
                 req->hdr.SessionId = ses->Suid;
                 ntlmssp_blob = kzalloc(sizeof(struct _NEGOTIATE_MESSAGE) + 500,
                                        GFP_KERNEL);
                 if (ntlmssp_blob == NULL) {
                         rc = -ENOMEM;
                         goto ssetup_exit;
                 }
                 rc = build_ntlmssp_auth_blob(ntlmssp_blob, &blob_length, ses,
                                              nls_cp);
                 if (rc) {
                         cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n",
                                  rc);
                         goto ssetup_exit; /* BB double check error handling */
                 }
                 if (use_spnego) {
                         /* blob_length = build_spnego_ntlmssp_blob(
                                                         &security_blob,
                                                         blob_length,
                                                         ntlmssp_blob); */
                         cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
                         rc = -EOPNOTSUPP;
                         kfree(ntlmssp_blob);
                         goto ssetup_exit;
                 } else {
                         security_blob = ntlmssp_blob;
                 }
         } else {
                 cifs_dbg(VFS, "illegal ntlmssp phase\n");
                 rc = -EIO;
                 goto ssetup_exit;
         }
 
         /* Testing shows that buffer offset must be at location of Buffer[0] */
         req->SecurityBufferOffset =
                                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) -
                                             1 /* pad */ - 4 /* rfc1001 len */);
         req->SecurityBufferLength = cpu_to_le16(blob_length);
         iov[1].iov_base = security_blob;
         iov[1].iov_len = blob_length;
 
         inc_rfc1001_len(req, blob_length - 1 /* pad */);
 
         /* BB add code to build os and lm fields */
 
         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype,
                           CIFS_LOG_ERROR | CIFS_NEG_OP);
 
         kfree(security_blob);
         rsp = (struct smb2_sess_setup_rsp *)iov[0].iov_base;
         if (resp_buftype != CIFS_NO_BUFFER &&
             rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED) {
                 if (phase != NtLmNegotiate) {
                         cifs_dbg(VFS, "Unexpected more processing error\n");
                         goto ssetup_exit;
                 }
                 if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 !=
                                 le16_to_cpu(rsp->SecurityBufferOffset)) {
                         cifs_dbg(VFS, "Invalid security buffer offset %d\n",
                                  le16_to_cpu(rsp->SecurityBufferOffset));
                         rc = -EIO;
                         goto ssetup_exit;
                 }
 
                 /* NTLMSSP Negotiate sent now processing challenge (response) */
                 phase = NtLmChallenge; /* process ntlmssp challenge */
                 rc = 0; /* MORE_PROCESSING is not an error here but expected */
                 ses->Suid = rsp->hdr.SessionId;
                 rc = decode_ntlmssp_challenge(rsp->Buffer,
                                 le16_to_cpu(rsp->SecurityBufferLength), ses);
         }
 
         /*
          * BB eventually add code for SPNEGO decoding of NtlmChallenge blob,
          * but at least the raw NTLMSSP case works.
          */
         /*
          * No tcon so can't do
          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
          */
         if (rc != 0)
                 goto ssetup_exit;
 
         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
                 cifs_dbg(VFS, "SMB3 encryption not supported yet\n");
 ssetup_exit:
         free_rsp_buf(resp_buftype, rsp);
 
         /* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */
         if ((phase == NtLmChallenge) && (rc == 0))
                 goto ssetup_ntlmssp_authenticate;
 
         if (!rc) {
                 mutex_lock(&server->srv_mutex);
                 if (server->sign && server->ops->generate_signingkey) {
                         rc = server->ops->generate_signingkey(ses);
                         kfree(ses->auth_key.response);
                         ses->auth_key.response = NULL;
                         if (rc) {
                                 cifs_dbg(FYI,
                                         "SMB3 session key generation failed\n");
                                 mutex_unlock(&server->srv_mutex);
                                 goto keygen_exit;
                         }
                 }
                 if (!server->session_estab) {
                         server->sequence_number = 0x2;
                         server->session_estab = true;
                 }
                 mutex_unlock(&server->srv_mutex);
 
                 cifs_dbg(FYI, "SMB2/3 session established successfully\n");
                 spin_lock(&GlobalMid_Lock);
                 ses->status = CifsGood;
                 ses->need_reconnect = false;
                 spin_unlock(&GlobalMid_Lock);
         }
 
 keygen_exit:
         if (!server->sign) {
                 kfree(ses->auth_key.response);
                 ses->auth_key.response = NULL;
         }
         kfree(ses->ntlmssp);
 
         return rc;
 }
 
 int
 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
 {
         struct smb2_logoff_req *req; /* response is also trivial struct */
         int rc = 0;
         struct TCP_Server_Info *server;
 
         cifs_dbg(FYI, "disconnect session %p\n", ses);
 
         if (ses && (ses->server))
                 server = ses->server;
         else
                 return -EIO;
 
         /* no need to send SMB logoff if uid already closed due to reconnect */
         if (ses->need_reconnect)
                 goto smb2_session_already_dead;
 
         rc = small_smb2_init(SMB2_LOGOFF, NULL, (void **) &req);
         if (rc)
                 return rc;
 
          /* since no tcon, smb2_init can not do this, so do here */
         req->hdr.SessionId = ses->Suid;
         if (server->sign)
                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
 
         rc = SendReceiveNoRsp(xid, ses, (char *) &req->hdr, 0);
         /*
          * No tcon so can't do
          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
          */
 
 smb2_session_already_dead:
         return rc;
 }
 
 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
 {
         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
 }
 
 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
 
 /* These are similar values to what Windows uses */
 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
 {
         tcon->max_chunks = 256;
         tcon->max_bytes_chunk = 1048576;
         tcon->max_bytes_copy = 16777216;
 }
 
 int
 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
           struct cifs_tcon *tcon, const struct nls_table *cp)
 {
         struct smb2_tree_connect_req *req;
         struct smb2_tree_connect_rsp *rsp = NULL;
         struct kvec iov[2];
         int rc = 0;
         int resp_buftype;
         int unc_path_len;
         struct TCP_Server_Info *server;
         __le16 *unc_path = NULL;
 
         cifs_dbg(FYI, "TCON\n");
 
         if ((ses->server) && tree)
                 server = ses->server;
         else
                 return -EIO;
 
         if (tcon && tcon->bad_network_name)
                 return -ENOENT;
 
         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
         if (unc_path == NULL)
                 return -ENOMEM;
 
         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
         unc_path_len *= 2;
         if (unc_path_len < 2) {
                 kfree(unc_path);
                 return -EINVAL;
         }
 
         rc = small_smb2_init(SMB2_TREE_CONNECT, tcon, (void **) &req);
         if (rc) {
                 kfree(unc_path);
                 return rc;
         }
 
         if (tcon == NULL) {
                 /* since no tcon, smb2_init can not do this, so do here */
                 req->hdr.SessionId = ses->Suid;
                 /* if (ses->server->sec_mode & SECMODE_SIGN_REQUIRED)
                         req->hdr.Flags |= SMB2_FLAGS_SIGNED; */
         }
 
         iov[0].iov_base = (char *)req;
         /* 4 for rfc1002 length field and 1 for pad */
         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 
         /* Testing shows that buffer offset must be at location of Buffer[0] */
         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
                         - 1 /* pad */ - 4 /* do not count rfc1001 len field */);
         req->PathLength = cpu_to_le16(unc_path_len - 2);
         iov[1].iov_base = unc_path;
         iov[1].iov_len = unc_path_len;
 
         inc_rfc1001_len(req, unc_path_len - 1 /* pad */);
 
         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
         rsp = (struct smb2_tree_connect_rsp *)iov[0].iov_base;
 
         if (rc != 0) {
                 if (tcon) {
                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
                         tcon->need_reconnect = true;
                 }
                 goto tcon_error_exit;
         }
 
         if (tcon == NULL) {
                 ses->ipc_tid = rsp->hdr.TreeId;
                 goto tcon_exit;
         }
 
         if (rsp->ShareType & SMB2_SHARE_TYPE_DISK)
                 cifs_dbg(FYI, "connection to disk share\n");
         else if (rsp->ShareType & SMB2_SHARE_TYPE_PIPE) {
                 tcon->ipc = true;
                 cifs_dbg(FYI, "connection to pipe share\n");
         } else if (rsp->ShareType & SMB2_SHARE_TYPE_PRINT) {
                 tcon->print = true;
                 cifs_dbg(FYI, "connection to printer\n");
         } else {
                 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
                 rc = -EOPNOTSUPP;
                 goto tcon_error_exit;
         }
 
         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
         tcon->tidStatus = CifsGood;
         tcon->need_reconnect = false;
         tcon->tid = rsp->hdr.TreeId;
         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
 
         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
                 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
         init_copy_chunk_defaults(tcon);
         if (tcon->ses->server->ops->validate_negotiate)
                 rc = tcon->ses->server->ops->validate_negotiate(xid, tcon);
 tcon_exit:
         free_rsp_buf(resp_buftype, rsp);
         kfree(unc_path);
         return rc;
 
 tcon_error_exit:
         if (rsp->hdr.Status == STATUS_BAD_NETWORK_NAME) {
                 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
                 tcon->bad_network_name = true;
         }
         goto tcon_exit;
 }
 
 int
 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
 {
         struct smb2_tree_disconnect_req *req; /* response is trivial */
         int rc = 0;
         struct TCP_Server_Info *server;
         struct cifs_ses *ses = tcon->ses;
 
         cifs_dbg(FYI, "Tree Disconnect\n");
 
         if (ses && (ses->server))
                 server = ses->server;
         else
                 return -EIO;
 
         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
                 return 0;
 
         rc = small_smb2_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req);
         if (rc)
                 return rc;
 
         rc = SendReceiveNoRsp(xid, ses, (char *)&req->hdr, 0);
         if (rc)
                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
 
         return rc;
 }
 
 
 static struct create_durable *
 create_durable_buf(void)
 {
         struct create_durable *buf;
 
         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
         if (!buf)
                 return NULL;
 
         buf->ccontext.DataOffset = cpu_to_le16(offsetof
                                         (struct create_durable, Data));
         buf->ccontext.DataLength = cpu_to_le32(16);
         buf->ccontext.NameOffset = cpu_to_le16(offsetof
                                 (struct create_durable, Name));
         buf->ccontext.NameLength = cpu_to_le16(4);
         buf->Name[0] = 'D';
         buf->Name[1] = 'H';
         buf->Name[2] = 'n';
         buf->Name[3] = 'Q';
         return buf;
 }
 
 static struct create_durable *
 create_reconnect_durable_buf(struct cifs_fid *fid)
 {
         struct create_durable *buf;
 
         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
         if (!buf)
                 return NULL;
 
         buf->ccontext.DataOffset = cpu_to_le16(offsetof
                                         (struct create_durable, Data));
         buf->ccontext.DataLength = cpu_to_le32(16);
         buf->ccontext.NameOffset = cpu_to_le16(offsetof
                                 (struct create_durable, Name));
         buf->ccontext.NameLength = cpu_to_le16(4);
         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
         buf->Name[0] = 'D';
         buf->Name[1] = 'H';
         buf->Name[2] = 'n';
         buf->Name[3] = 'C';
         return buf;
 }
 
 static __u8
 parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp,
                   unsigned int *epoch)
 {
         char *data_offset;
         struct create_context *cc;
         unsigned int next = 0;
         char *name;
 
         data_offset = (char *)rsp + 4 + le32_to_cpu(rsp->CreateContextsOffset);
         cc = (struct create_context *)data_offset;
         do {
                 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(cc->Next);
                         continue;
                 }
                 return server->ops->parse_lease_buf(cc, epoch);
         } while (next != 0);
 
         return 0;
 }
 
 static int
 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
                   unsigned int *num_iovec, __u8 *oplock)
 {
         struct smb2_create_req *req = iov[0].iov_base;
         unsigned int num = *num_iovec;
 
         iov[num].iov_base = server->ops->create_lease_buf(oplock+1, *oplock);
         if (iov[num].iov_base == NULL)
                 return -ENOMEM;
         iov[num].iov_len = server->vals->create_lease_size;
         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
         if (!req->CreateContextsOffset)
                 req->CreateContextsOffset = cpu_to_le32(
                                 sizeof(struct smb2_create_req) - 4 +
                                 iov[num - 1].iov_len);
         le32_add_cpu(&req->CreateContextsLength,
                      server->vals->create_lease_size);
         inc_rfc1001_len(&req->hdr, server->vals->create_lease_size);
         *num_iovec = num + 1;
         return 0;
 }
 
 static int
 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
                     struct cifs_open_parms *oparms)
 {
         struct smb2_create_req *req = iov[0].iov_base;
         unsigned int num = *num_iovec;
 
         if (oparms->reconnect) {
                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
                 /* indicate that we don't need to relock the file */
                 oparms->reconnect = false;
         } else
                 iov[num].iov_base = create_durable_buf();
         if (iov[num].iov_base == NULL)
                 return -ENOMEM;
         iov[num].iov_len = sizeof(struct create_durable);
         if (!req->CreateContextsOffset)
                 req->CreateContextsOffset =
                         cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
                                                                 iov[1].iov_len);
         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
         inc_rfc1001_len(&req->hdr, sizeof(struct create_durable));
         *num_iovec = num + 1;
         return 0;
 }
 
 int
 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
           __u8 *oplock, struct smb2_file_all_info *buf,
           struct smb2_err_rsp **err_buf)
 {
         struct smb2_create_req *req;
         struct smb2_create_rsp *rsp;
         struct TCP_Server_Info *server;
         struct cifs_tcon *tcon = oparms->tcon;
         struct cifs_ses *ses = tcon->ses;
         struct kvec iov[4];
         int resp_buftype;
         int uni_path_len;
         __le16 *copy_path = NULL;
         int copy_size;
         int rc = 0;
         unsigned int num_iovecs = 2;
         __u32 file_attributes = 0;
 
         cifs_dbg(FYI, "create/open\n");
 
         if (ses && (ses->server))
                 server = ses->server;
         else
                 return -EIO;
 
         rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req);
         if (rc)
                 return rc;
 
         if (oparms->create_options & CREATE_OPTION_READONLY)
                 file_attributes |= ATTR_READONLY;
 
         req->ImpersonationLevel = IL_IMPERSONATION;
         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
         /* File attributes ignored on open (used in create though) */
         req->FileAttributes = cpu_to_le32(file_attributes);
         req->ShareAccess = FILE_SHARE_ALL_LE;
         req->CreateDisposition = cpu_to_le32(oparms->disposition);
         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
         uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
         /* do not count rfc1001 len field */
         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req) - 4);
 
         iov[0].iov_base = (char *)req;
         /* 4 for rfc1002 length field */
         iov[0].iov_len = get_rfc1002_length(req) + 4;
 
         /* MUST set path len (NameLength) to 0 opening root of share */
         req->NameLength = cpu_to_le16(uni_path_len - 2);
         /* -1 since last byte is buf[0] which is sent below (path) */
         iov[0].iov_len--;
         if (uni_path_len % 8 != 0) {
                 copy_size = uni_path_len / 8 * 8;
                 if (copy_size < uni_path_len)
                         copy_size += 8;
 
                 copy_path = kzalloc(copy_size, GFP_KERNEL);
                 if (!copy_path)
                         return -ENOMEM;
                 memcpy((char *)copy_path, (const char *)path,
                         uni_path_len);
                 uni_path_len = copy_size;
                 path = copy_path;
         }
 
         iov[1].iov_len = uni_path_len;
         iov[1].iov_base = path;
         /* -1 since last byte is buf[0] which was counted in smb2_buf_len */
         inc_rfc1001_len(req, uni_path_len - 1);
 
         if (!server->oplocks)
                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
 
         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
             *oplock == SMB2_OPLOCK_LEVEL_NONE)
                 req->RequestedOplockLevel = *oplock;
         else {
                 rc = add_lease_context(server, iov, &num_iovecs, oplock);
                 if (rc) {
                         cifs_small_buf_release(req);
                         kfree(copy_path);
                         return rc;
                 }
         }
 
         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
                 /* need to set Next field of lease context if we request it */
                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
                         struct create_context *ccontext =
                             (struct create_context *)iov[num_iovecs-1].iov_base;
                         ccontext->Next =
                                 cpu_to_le32(server->vals->create_lease_size);
                 }
                 rc = add_durable_context(iov, &num_iovecs, oparms);
                 if (rc) {
                         cifs_small_buf_release(req);
                         kfree(copy_path);
                         kfree(iov[num_iovecs-1].iov_base);
                         return rc;
                 }
         }
 
         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
         rsp = (struct smb2_create_rsp *)iov[0].iov_base;
 
         if (rc != 0) {
                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
                 if (err_buf)
                         *err_buf = kmemdup(rsp, get_rfc1002_length(rsp) + 4,
                                            GFP_KERNEL);
                 goto creat_exit;
         }
 
         oparms->fid->persistent_fid = rsp->PersistentFileId;
         oparms->fid->volatile_fid = rsp->VolatileFileId;
 
         if (buf) {
                 memcpy(buf, &rsp->CreationTime, 32);
                 buf->AllocationSize = rsp->AllocationSize;
                 buf->EndOfFile = rsp->EndofFile;
                 buf->Attributes = rsp->FileAttributes;
                 buf->NumberOfLinks = cpu_to_le32(1);
                 buf->DeletePending = 0;
         }
 
         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
                 *oplock = parse_lease_state(server, rsp, &oparms->fid->epoch);
         else
                 *oplock = rsp->OplockLevel;
 creat_exit:
         kfree(copy_path);
         free_rsp_buf(resp_buftype, rsp);
         return rc;
 }
 
 /*
  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
  */
 int
 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
            u64 volatile_fid, u32 opcode, bool is_fsctl, char *in_data,
            u32 indatalen, char **out_data, u32 *plen /* returned data len */)
 {
         struct smb2_ioctl_req *req;
         struct smb2_ioctl_rsp *rsp;
         struct TCP_Server_Info *server;
         struct cifs_ses *ses = tcon->ses;
         struct kvec iov[2];
         int resp_buftype;
         int num_iovecs;
         int rc = 0;
 
         cifs_dbg(FYI, "SMB2 IOCTL\n");
 
         *out_data = NULL;
         /* zero out returned data len, in case of error */
         if (plen)
                 *plen = 0;
 
         if (ses && (ses->server))
                 server = ses->server;
         else
                 return -EIO;
 
         rc = small_smb2_init(SMB2_IOCTL, tcon, (void **) &req);
         if (rc)
                 return rc;
 
         req->CtlCode = cpu_to_le32(opcode);
         req->PersistentFileId = persistent_fid;
         req->VolatileFileId = volatile_fid;
 
         if (indatalen) {
                 req->InputCount = cpu_to_le32(indatalen);
                 /* do not set InputOffset if no input data */
                 req->InputOffset =
                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer) - 4);
                 iov[1].iov_base = in_data;
                 iov[1].iov_len = indatalen;
                 num_iovecs = 2;
         } else
                 num_iovecs = 1;
 
         req->OutputOffset = 0;
         req->OutputCount = 0; /* MBZ */
 
         /*
          * Could increase MaxOutputResponse, but that would require more
          * than one credit. Windows typically sets this smaller, but for some
          * ioctls it may be useful to allow server to send more. No point
          * limiting what the server can send as long as fits in one credit
          */
         req->MaxOutputResponse = cpu_to_le32(0xFF00); /* < 64K uses 1 credit */
 
         if (is_fsctl)
                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
         else
                 req->Flags = 0;
 
         iov[0].iov_base = (char *)req;
 
         /*
          * If no input data, the size of ioctl struct in
          * protocol spec still includes a 1 byte data buffer,
          * but if input data passed to ioctl, we do not
          * want to double count this, so we do not send
          * the dummy one byte of data in iovec[0] if sending
          * input data (in iovec[1]). We also must add 4 bytes
          * in first iovec to allow for rfc1002 length field.
          */
 
         if (indatalen) {
                 iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
                 inc_rfc1001_len(req, indatalen - 1);
         } else
                 iov[0].iov_len = get_rfc1002_length(req) + 4;
 
 
         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
         rsp = (struct smb2_ioctl_rsp *)iov[0].iov_base;
 
         if ((rc != 0) && (rc != -EINVAL)) {
                 if (tcon)
                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
                 goto ioctl_exit;
         } else if (rc == -EINVAL) {
                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
                     (opcode != FSCTL_SRV_COPYCHUNK)) {
                         if (tcon)
                                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
                         goto ioctl_exit;
                 }
         }
 
         /* check if caller wants to look at return data or just return rc */
         if ((plen == NULL) || (out_data == NULL))
                 goto ioctl_exit;
 
         *plen = le32_to_cpu(rsp->OutputCount);
 
         /* We check for obvious errors in the output buffer length and offset */
         if (*plen == 0)
                 goto ioctl_exit; /* server returned no data */
         else if (*plen > 0xFF00) {
                 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
                 *plen = 0;
                 rc = -EIO;
                 goto ioctl_exit;
         }
 
         if (get_rfc1002_length(rsp) < le32_to_cpu(rsp->OutputOffset) + *plen) {
                 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
                         le32_to_cpu(rsp->OutputOffset));
                 *plen = 0;
                 rc = -EIO;
                 goto ioctl_exit;
         }
 
         *out_data = kmalloc(*plen, GFP_KERNEL);
         if (*out_data == NULL) {
                 rc = -ENOMEM;
                 goto ioctl_exit;
         }
 
         memcpy(*out_data, rsp->hdr.ProtocolId + le32_to_cpu(rsp->OutputOffset),
                *plen);
 ioctl_exit:
         free_rsp_buf(resp_buftype, rsp);
         return rc;
 }
 
 /*
  *   Individual callers to ioctl worker function follow
  */
 
 int
 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
                      u64 persistent_fid, u64 volatile_fid)
 {
         int rc;
         char *res_key = NULL;
         struct  compress_ioctl fsctl_input;
         char *ret_data = NULL;
 
         fsctl_input.CompressionState =
                         __constant_cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
 
         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
                         FSCTL_SET_COMPRESSION, true /* is_fsctl */,
                         (char *)&fsctl_input /* data input */,
                         2 /* in data len */, &ret_data /* out data */, NULL);
 
         cifs_dbg(FYI, "set compression rc %d\n", rc);
         kfree(res_key);
 
         return rc;
 }
 
 int
 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
            u64 persistent_fid, u64 volatile_fid)
 {
         struct smb2_close_req *req;
         struct smb2_close_rsp *rsp;
         struct TCP_Server_Info *server;
         struct cifs_ses *ses = tcon->ses;
         struct kvec iov[1];
         int resp_buftype;
         int rc = 0;
 
         cifs_dbg(FYI, "Close\n");
 
         if (ses && (ses->server))
                 server = ses->server;
         else
                 return -EIO;
 
         rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &req);
         if (rc)
                 return rc;
 
         req->PersistentFileId = persistent_fid;
         req->VolatileFileId = volatile_fid;
 
         iov[0].iov_base = (char *)req;
         /* 4 for rfc1002 length field */
         iov[0].iov_len = get_rfc1002_length(req) + 4;
 
         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
         rsp = (struct smb2_close_rsp *)iov[0].iov_base;
 
         if (rc != 0) {
                 if (tcon)
                         cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
                 goto close_exit;
         }
 
         /* BB FIXME - decode close response, update inode for caching */
 
 close_exit:
         free_rsp_buf(resp_buftype, rsp);
         return rc;
 }
 
 static int
 validate_buf(unsigned int offset, unsigned int buffer_length,
              struct smb2_hdr *hdr, unsigned int min_buf_size)
 
 {
         unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length);
         char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr;
         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
         char *end_of_buf = begin_of_buf + buffer_length;
 
 
         if (buffer_length < min_buf_size) {
                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
                          buffer_length, min_buf_size);
                 return -EINVAL;
         }
 
         /* check if beyond RFC1001 maximum length */
         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
                          buffer_length, smb_len);
                 return -EINVAL;
         }
 
         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
                 return -EINVAL;
         }
 
         return 0;
 }
 
 /*
  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
  * Caller must free buffer.
  */
 static int
 validate_and_copy_buf(unsigned int offset, unsigned int buffer_length,
                       struct smb2_hdr *hdr, unsigned int minbufsize,
                       char *data)
 
 {
         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
         int rc;
 
         if (!data)
                 return -EINVAL;
 
         rc = validate_buf(offset, buffer_length, hdr, minbufsize);
         if (rc)
                 return rc;
 
         memcpy(data, begin_of_buf, buffer_length);
 
         return 0;
 }
 
 static int
 query_info(const unsigned int xid, struct cifs_tcon *tcon,
            u64 persistent_fid, u64 volatile_fid, u8 info_class,
            size_t output_len, size_t min_len, void *data)
 {
         struct smb2_query_info_req *req;
         struct smb2_query_info_rsp *rsp = NULL;
         struct kvec iov[2];
         int rc = 0;
         int resp_buftype;
         struct TCP_Server_Info *server;
         struct cifs_ses *ses = tcon->ses;
 
         cifs_dbg(FYI, "Query Info\n");
 
         if (ses && (ses->server))
                 server = ses->server;
         else
                 return -EIO;
 
         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
         if (rc)
                 return rc;
 
         req->InfoType = SMB2_O_INFO_FILE;
         req->FileInfoClass = info_class;
         req->PersistentFileId = persistent_fid;
         req->VolatileFileId = volatile_fid;
         /* 4 for rfc1002 length field and 1 for Buffer */
         req->InputBufferOffset =
                 cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
         req->OutputBufferLength = cpu_to_le32(output_len);
 
         iov[0].iov_base = (char *)req;
         /* 4 for rfc1002 length field */
         iov[0].iov_len = get_rfc1002_length(req) + 4;
 
         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
         rsp = (struct smb2_query_info_rsp *)iov[0].iov_base;
 
         if (rc) {
                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
                 goto qinf_exit;
         }
 
         rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
                                    le32_to_cpu(rsp->OutputBufferLength),
                                    &rsp->hdr, min_len, data);
 
 qinf_exit:
         free_rsp_buf(resp_buftype, rsp);
         return rc;
 }
 
 int
 SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
                 u64 persistent_fid, u64 volatile_fid,
                 struct smb2_file_all_info *data)
 {
         return query_info(xid, tcon, persistent_fid, volatile_fid,
                           FILE_ALL_INFORMATION,
                           sizeof(struct smb2_file_all_info) + MAX_NAME * 2,
                           sizeof(struct smb2_file_all_info), data);
 }
 
 int
 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
 {
         return query_info(xid, tcon, persistent_fid, volatile_fid,
                           FILE_INTERNAL_INFORMATION,
                           sizeof(struct smb2_file_internal_info),
                           sizeof(struct smb2_file_internal_info), uniqueid);
 }
 
 /*
  * This is a no-op for now. We're not really interested in the reply, but
  * rather in the fact that the server sent one and that server->lstrp
  * gets updated.
  *
  * FIXME: maybe we should consider checking that the reply matches request?
  */
 static void
 smb2_echo_callback(struct mid_q_entry *mid)
 {
         struct TCP_Server_Info *server = mid->callback_data;
         struct smb2_echo_rsp *smb2 = (struct smb2_echo_rsp *)mid->resp_buf;
         unsigned int credits_received = 1;
 
         if (mid->mid_state == MID_RESPONSE_RECEIVED)
                 credits_received = le16_to_cpu(smb2->hdr.CreditRequest);
 
         DeleteMidQEntry(mid);
         add_credits(server, credits_received, CIFS_ECHO_OP);
 }
 
 int
 SMB2_echo(struct TCP_Server_Info *server)
 {
         struct smb2_echo_req *req;
         int rc = 0;
         struct kvec iov;
         struct smb_rqst rqst = { .rq_iov = &iov,
                                  .rq_nvec = 1 };
 
         cifs_dbg(FYI, "In echo request\n");
 
         rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req);
         if (rc)
                 return rc;
 
         req->hdr.CreditRequest = cpu_to_le16(1);
 
         iov.iov_base = (char *)req;
         /* 4 for rfc1002 length field */
         iov.iov_len = get_rfc1002_length(req) + 4;
 
         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, server,
                              CIFS_ECHO_OP);
         if (rc)
                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
 
         cifs_small_buf_release(req);
         return rc;
 }
 
 int
 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
            u64 volatile_fid)
 {
         struct smb2_flush_req *req;
         struct TCP_Server_Info *server;
         struct cifs_ses *ses = tcon->ses;
         struct kvec iov[1];
         int resp_buftype;
         int rc = 0;
 
         cifs_dbg(FYI, "Flush\n");
 
         if (ses && (ses->server))
                 server = ses->server;
         else
                 return -EIO;
 
         rc = small_smb2_init(SMB2_FLUSH, tcon, (void **) &req);
         if (rc)
                 return rc;
 
         req->PersistentFileId = persistent_fid;
         req->VolatileFileId = volatile_fid;
 
         iov[0].iov_base = (char *)req;
         /* 4 for rfc1002 length field */
         iov[0].iov_len = get_rfc1002_length(req) + 4;
 
         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
 
         if ((rc != 0) && tcon)
                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
 
         free_rsp_buf(resp_buftype, iov[0].iov_base);
         return rc;
 }
 
 /*
  * To form a chain of read requests, any read requests after the first should
  * have the end_of_chain boolean set to true.
  */
 static int
 smb2_new_read_req(struct kvec *iov, struct cifs_io_parms *io_parms,
                   unsigned int remaining_bytes, int request_type)
 {
         int rc = -EACCES;
         struct smb2_read_req *req = NULL;
 
         rc = small_smb2_init(SMB2_READ, io_parms->tcon, (void **) &req);
         if (rc)
                 return rc;
         if (io_parms->tcon->ses->server == NULL)
                 return -ECONNABORTED;
 
         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
 
         req->PersistentFileId = io_parms->persistent_fid;
         req->VolatileFileId = io_parms->volatile_fid;
         req->ReadChannelInfoOffset = 0; /* reserved */
         req->ReadChannelInfoLength = 0; /* reserved */
         req->Channel = 0; /* reserved */
         req->MinimumCount = 0;
         req->Length = cpu_to_le32(io_parms->length);
         req->Offset = cpu_to_le64(io_parms->offset);
 
         if (request_type & CHAINED_REQUEST) {
                 if (!(request_type & END_OF_CHAIN)) {
                         /* 4 for rfc1002 length field */
                         req->hdr.NextCommand =
                                 cpu_to_le32(get_rfc1002_length(req) + 4);
                 } else /* END_OF_CHAIN */
                         req->hdr.NextCommand = 0;
                 if (request_type & RELATED_REQUEST) {
                         req->hdr.Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
                         /*
                          * Related requests use info from previous read request
                          * in chain.
                          */
                         req->hdr.SessionId = 0xFFFFFFFF;
                         req->hdr.TreeId = 0xFFFFFFFF;
                         req->PersistentFileId = 0xFFFFFFFF;
                         req->VolatileFileId = 0xFFFFFFFF;
                 }
         }
         if (remaining_bytes > io_parms->length)
                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
         else
                 req->RemainingBytes = 0;
 
         iov[0].iov_base = (char *)req;
         /* 4 for rfc1002 length field */
         iov[0].iov_len = get_rfc1002_length(req) + 4;
         return rc;
 }
 
 static void
 smb2_readv_callback(struct mid_q_entry *mid)
 {
         struct cifs_readdata *rdata = mid->callback_data;
         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
         struct TCP_Server_Info *server = tcon->ses->server;
         struct smb2_hdr *buf = (struct smb2_hdr *)rdata->iov.iov_base;
         unsigned int credits_received = 1;
         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
                                  .rq_nvec = 1,
                                  .rq_pages = rdata->pages,
                                  .rq_npages = rdata->nr_pages,
                                  .rq_pagesz = rdata->pagesz,
                                  .rq_tailsz = rdata->tailsz };
 
         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
                  __func__, mid->mid, mid->mid_state, rdata->result,
                  rdata->bytes);
 
         switch (mid->mid_state) {
         case MID_RESPONSE_RECEIVED:
                 credits_received = le16_to_cpu(buf->CreditRequest);
                 /* result already set, check signature */
                 if (server->sign) {
                         int rc;
 
                         rc = smb2_verify_signature(&rqst, server);
                         if (rc)
                                 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
                                          rc);
                 }
                 /* FIXME: should this be counted toward the initiating task? */
                 task_io_account_read(rdata->bytes);
                 cifs_stats_bytes_read(tcon, rdata->bytes);
                 break;
         case MID_REQUEST_SUBMITTED:
         case MID_RETRY_NEEDED:
                 rdata->result = -EAGAIN;
                 break;
         default:
                 if (rdata->result != -ENODATA)
                         rdata->result = -EIO;
         }
 
         if (rdata->result)
                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
 
         queue_work(cifsiod_wq, &rdata->work);
         DeleteMidQEntry(mid);
         add_credits(server, credits_received, 0);
 }
 
 /* smb2_async_readv - send an async write, and set up mid to handle result */
 int
 smb2_async_readv(struct cifs_readdata *rdata)
 {
         int rc;
         struct smb2_hdr *buf;
         struct cifs_io_parms io_parms;
         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
                                  .rq_nvec = 1 };
 
         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
                  __func__, rdata->offset, rdata->bytes);
 
         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
         io_parms.offset = rdata->offset;
         io_parms.length = rdata->bytes;
         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
         io_parms.pid = rdata->pid;
         rc = smb2_new_read_req(&rdata->iov, &io_parms, 0, 0);
         if (rc)
                 return rc;
 
         buf = (struct smb2_hdr *)rdata->iov.iov_base;
         /* 4 for rfc1002 length field */
         rdata->iov.iov_len = get_rfc1002_length(rdata->iov.iov_base) + 4;
 
         kref_get(&rdata->refcount);
         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
                              cifs_readv_receive, smb2_readv_callback,
                              rdata, 0);
         if (rc) {
                 kref_put(&rdata->refcount, cifs_readdata_release);
                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
         }
 
         cifs_small_buf_release(buf);
         return rc;
 }
 
 int
 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
           unsigned int *nbytes, char **buf, int *buf_type)
 {
         int resp_buftype, rc = -EACCES;
         struct smb2_read_rsp *rsp = NULL;
         struct kvec iov[1];
 
         *nbytes = 0;
         rc = smb2_new_read_req(iov, io_parms, 0, 0);
         if (rc)
                 return rc;
 
         rc = SendReceive2(xid, io_parms->tcon->ses, iov, 1,
                           &resp_buftype, CIFS_LOG_ERROR);
 
         rsp = (struct smb2_read_rsp *)iov[0].iov_base;
 
         if (rsp->hdr.Status == STATUS_END_OF_FILE) {
                 free_rsp_buf(resp_buftype, iov[0].iov_base);
                 return 0;
         }
 
         if (rc) {
                 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
                 cifs_dbg(VFS, "Send error in read = %d\n", rc);
         } else {
                 *nbytes = le32_to_cpu(rsp->DataLength);
                 if ((*nbytes > CIFS_MAX_MSGSIZE) ||
                     (*nbytes > io_parms->length)) {
                         cifs_dbg(FYI, "bad length %d for count %d\n",
                                  *nbytes, io_parms->length);
                         rc = -EIO;
                         *nbytes = 0;
                 }
         }
 
         if (*buf) {
                 memcpy(*buf, (char *)rsp->hdr.ProtocolId + rsp->DataOffset,
                        *nbytes);
                 free_rsp_buf(resp_buftype, iov[0].iov_base);
         } else if (resp_buftype != CIFS_NO_BUFFER) {
                 *buf = iov[0].iov_base;
                 if (resp_buftype == CIFS_SMALL_BUFFER)
                         *buf_type = CIFS_SMALL_BUFFER;
                 else if (resp_buftype == CIFS_LARGE_BUFFER)
                         *buf_type = CIFS_LARGE_BUFFER;
         }
         return rc;
 }
 
 /*
  * Check the mid_state and signature on received buffer (if any), and queue the
  * workqueue completion task.
  */
 static void
 smb2_writev_callback(struct mid_q_entry *mid)
 {
         struct cifs_writedata *wdata = mid->callback_data;
         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
         unsigned int written;
         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
         unsigned int credits_received = 1;
 
         switch (mid->mid_state) {
         case MID_RESPONSE_RECEIVED:
                 credits_received = le16_to_cpu(rsp->hdr.CreditRequest);
                 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
                 if (wdata->result != 0)
                         break;
 
                 written = le32_to_cpu(rsp->DataLength);
                 /*
                  * Mask off high 16 bits when bytes written as returned
                  * by the server is greater than bytes requested by the
                  * client. OS/2 servers are known to set incorrect
                  * CountHigh values.
                  */
                 if (written > wdata->bytes)
                         written &= 0xFFFF;
 
                 if (written < wdata->bytes)
                         wdata->result = -ENOSPC;
                 else
                         wdata->bytes = written;
                 break;
         case MID_REQUEST_SUBMITTED:
         case MID_RETRY_NEEDED:
                 wdata->result = -EAGAIN;
                 break;
         default:
                 wdata->result = -EIO;
                 break;
         }
 
         if (wdata->result)
                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
 
         queue_work(cifsiod_wq, &wdata->work);
         DeleteMidQEntry(mid);
         add_credits(tcon->ses->server, credits_received, 0);
 }
 
 /* smb2_async_writev - send an async write, and set up mid to handle result */
 int
 smb2_async_writev(struct cifs_writedata *wdata)
 {
         int rc = -EACCES;
         struct smb2_write_req *req = NULL;
         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
         struct kvec iov;
         struct smb_rqst rqst;
 
         rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req);
         if (rc)
                 goto async_writev_out;
 
         req->hdr.ProcessId = cpu_to_le32(wdata->cfile->pid);
 
         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
         req->WriteChannelInfoOffset = 0;
         req->WriteChannelInfoLength = 0;
         req->Channel = 0;
         req->Offset = cpu_to_le64(wdata->offset);
         /* 4 for rfc1002 length field */
         req->DataOffset = cpu_to_le16(
                                 offsetof(struct smb2_write_req, Buffer) - 4);
         req->RemainingBytes = 0;
 
         /* 4 for rfc1002 length field and 1 for Buffer */
         iov.iov_len = get_rfc1002_length(req) + 4 - 1;
         iov.iov_base = req;
 
         rqst.rq_iov = &iov;
         rqst.rq_nvec = 1;
         rqst.rq_pages = wdata->pages;
         rqst.rq_npages = wdata->nr_pages;
         rqst.rq_pagesz = wdata->pagesz;
         rqst.rq_tailsz = wdata->tailsz;
 
         cifs_dbg(FYI, "async write at %llu %u bytes\n",
                  wdata->offset, wdata->bytes);
 
         req->Length = cpu_to_le32(wdata->bytes);
 
         inc_rfc1001_len(&req->hdr, wdata->bytes - 1 /* Buffer */);
 
         kref_get(&wdata->refcount);
         rc = cifs_call_async(tcon->ses->server, &rqst, NULL,
                                 smb2_writev_callback, wdata, 0);
 
         if (rc) {
                 kref_put(&wdata->refcount, cifs_writedata_release);
                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
         }
 
 async_writev_out:
         cifs_small_buf_release(req);
         return rc;
 }
 
 /*
  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
  * The length field from io_parms must be at least 1 and indicates a number of
  * elements with data to write that begins with position 1 in iov array. All
  * data length is specified by count.
  */
 int
 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
            unsigned int *nbytes, struct kvec *iov, int n_vec)
 {
         int rc = 0;
         struct smb2_write_req *req = NULL;
         struct smb2_write_rsp *rsp = NULL;
         int resp_buftype;
         *nbytes = 0;
 
         if (n_vec < 1)
                 return rc;
 
         rc = small_smb2_init(SMB2_WRITE, io_parms->tcon, (void **) &req);
         if (rc)
                 return rc;
 
         if (io_parms->tcon->ses->server == NULL)
                 return -ECONNABORTED;
 
         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
 
         req->PersistentFileId = io_parms->persistent_fid;
         req->VolatileFileId = io_parms->volatile_fid;
         req->WriteChannelInfoOffset = 0;
         req->WriteChannelInfoLength = 0;
         req->Channel = 0;
         req->Length = cpu_to_le32(io_parms->length);
         req->Offset = cpu_to_le64(io_parms->offset);
         /* 4 for rfc1002 length field */
         req->DataOffset = cpu_to_le16(
                                 offsetof(struct smb2_write_req, Buffer) - 4);
         req->RemainingBytes = 0;
 
         iov[0].iov_base = (char *)req;
         /* 4 for rfc1002 length field and 1 for Buffer */
         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 
         /* length of entire message including data to be written */
         inc_rfc1001_len(req, io_parms->length - 1 /* Buffer */);
 
         rc = SendReceive2(xid, io_parms->tcon->ses, iov, n_vec + 1,
                           &resp_buftype, 0);
         rsp = (struct smb2_write_rsp *)iov[0].iov_base;
 
         if (rc) {
                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
         } else
                 *nbytes = le32_to_cpu(rsp->DataLength);
 
         free_rsp_buf(resp_buftype, rsp);
         return rc;
 }
 
 static unsigned int
 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
 {
         int len;
         unsigned int entrycount = 0;
         unsigned int next_offset = 0;
         FILE_DIRECTORY_INFO *entryptr;
 
         if (bufstart == NULL)
                 return 0;
 
         entryptr = (FILE_DIRECTORY_INFO *)bufstart;
 
         while (1) {
                 entryptr = (FILE_DIRECTORY_INFO *)
                                         ((char *)entryptr + next_offset);
 
                 if ((char *)entryptr + size > end_of_buf) {
                         cifs_dbg(VFS, "malformed search entry would overflow\n");
                         break;
                 }
 
                 len = le32_to_cpu(entryptr->FileNameLength);
                 if ((char *)entryptr + len + size > end_of_buf) {
                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
                                  end_of_buf);
                         break;
                 }
 
                 *lastentry = (char *)entryptr;
                 entrycount++;
 
                 next_offset = le32_to_cpu(entryptr->NextEntryOffset);
                 if (!next_offset)
                         break;
         }
 
         return entrycount;
 }
 
 /*
  * Readdir/FindFirst
  */
 int
 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
                      u64 persistent_fid, u64 volatile_fid, int index,
                      struct cifs_search_info *srch_inf)
 {
         struct smb2_query_directory_req *req;
         struct smb2_query_directory_rsp *rsp = NULL;
         struct kvec iov[2];
         int rc = 0;
         int len;
         int resp_buftype;
         unsigned char *bufptr;
         struct TCP_Server_Info *server;
         struct cifs_ses *ses = tcon->ses;
         __le16 asteriks = cpu_to_le16('*');
         char *end_of_smb;
         unsigned int output_size = CIFSMaxBufSize;
         size_t info_buf_size;
 
         if (ses && (ses->server))
                 server = ses->server;
         else
                 return -EIO;
 
         rc = small_smb2_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req);
         if (rc)
                 return rc;
 
         switch (srch_inf->info_level) {
         case SMB_FIND_FILE_DIRECTORY_INFO:
                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
                 break;
         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
                 break;
         default:
                 cifs_dbg(VFS, "info level %u isn't supported\n",
                          srch_inf->info_level);
                 rc = -EINVAL;
                 goto qdir_exit;
         }
 
         req->FileIndex = cpu_to_le32(index);
         req->PersistentFileId = persistent_fid;
         req->VolatileFileId = volatile_fid;
 
         len = 0x2;
         bufptr = req->Buffer;
         memcpy(bufptr, &asteriks, len);
 
         req->FileNameOffset =
                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1 - 4);
         req->FileNameLength = cpu_to_le16(len);
         /*
          * BB could be 30 bytes or so longer if we used SMB2 specific
          * buffer lengths, but this is safe and close enough.
          */
         output_size = min_t(unsigned int, output_size, server->maxBuf);
         output_size = min_t(unsigned int, output_size, 2 << 15);
         req->OutputBufferLength = cpu_to_le32(output_size);
 
         iov[0].iov_base = (char *)req;
         /* 4 for RFC1001 length and 1 for Buffer */
         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 
         iov[1].iov_base = (char *)(req->Buffer);
         iov[1].iov_len = len;
 
         inc_rfc1001_len(req, len - 1 /* Buffer */);
 
         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
         rsp = (struct smb2_query_directory_rsp *)iov[0].iov_base;
 
         if (rc) {
                 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
                 goto qdir_exit;
         }
 
         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
                           info_buf_size);
         if (rc)
                 goto qdir_exit;
 
         srch_inf->unicode = true;
 
         if (srch_inf->ntwrk_buf_start) {
                 if (srch_inf->smallBuf)
                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
                 else
                         cifs_buf_release(srch_inf->ntwrk_buf_start);
         }
         srch_inf->ntwrk_buf_start = (char *)rsp;
         srch_inf->srch_entries_start = srch_inf->last_entry = 4 /* rfclen */ +
                 (char *)&rsp->hdr + le16_to_cpu(rsp->OutputBufferOffset);
         /* 4 for rfc1002 length field */
         end_of_smb = get_rfc1002_length(rsp) + 4 + (char *)&rsp->hdr;
         srch_inf->entries_in_buffer =
                         num_entries(srch_inf->srch_entries_start, end_of_smb,
                                     &srch_inf->last_entry, info_buf_size);
         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
                  srch_inf->srch_entries_start, srch_inf->last_entry);
         if (resp_buftype == CIFS_LARGE_BUFFER)
                 srch_inf->smallBuf = false;
         else if (resp_buftype == CIFS_SMALL_BUFFER)
                 srch_inf->smallBuf = true;
         else
                 cifs_dbg(VFS, "illegal search buffer type\n");
 
         if (rsp->hdr.Status == STATUS_NO_MORE_FILES)
                 srch_inf->endOfSearch = 1;
         else
                 srch_inf->endOfSearch = 0;
 
         return rc;
 
 qdir_exit:
         free_rsp_buf(resp_buftype, rsp);
         return rc;
 }
 
 static int
 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
                u64 persistent_fid, u64 volatile_fid, u32 pid, int info_class,
                unsigned int num, void **data, unsigned int *size)
 {
         struct smb2_set_info_req *req;
         struct smb2_set_info_rsp *rsp = NULL;
         struct kvec *iov;
         int rc = 0;
         int resp_buftype;
         unsigned int i;
         struct TCP_Server_Info *server;
         struct cifs_ses *ses = tcon->ses;
 
         if (ses && (ses->server))
                 server = ses->server;
         else
                 return -EIO;
 
         if (!num)
                 return -EINVAL;
 
         iov = kmalloc(sizeof(struct kvec) * num, GFP_KERNEL);
         if (!iov)
                 return -ENOMEM;
 
         rc = small_smb2_init(SMB2_SET_INFO, tcon, (void **) &req);
         if (rc) {
                 kfree(iov);
                 return rc;
         }
 
         req->hdr.ProcessId = cpu_to_le32(pid);
 
         req->InfoType = SMB2_O_INFO_FILE;
         req->FileInfoClass = info_class;
         req->PersistentFileId = persistent_fid;
         req->VolatileFileId = volatile_fid;
 
         /* 4 for RFC1001 length and 1 for Buffer */
         req->BufferOffset =
                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1 - 4);
         req->BufferLength = cpu_to_le32(*size);
 
         inc_rfc1001_len(req, *size - 1 /* Buffer */);
 
         memcpy(req->Buffer, *data, *size);
 
         iov[0].iov_base = (char *)req;
         /* 4 for RFC1001 length */
         iov[0].iov_len = get_rfc1002_length(req) + 4;
 
         for (i = 1; i < num; i++) {
                 inc_rfc1001_len(req, size[i]);
                 le32_add_cpu(&req->BufferLength, size[i]);
                 iov[i].iov_base = (char *)data[i];
                 iov[i].iov_len = size[i];
         }
 
         rc = SendReceive2(xid, ses, iov, num, &resp_buftype, 0);
         rsp = (struct smb2_set_info_rsp *)iov[0].iov_base;
 
         if (rc != 0)
                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
 
         free_rsp_buf(resp_buftype, rsp);
         kfree(iov);
         return rc;
 }
 
 int
 SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
             u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
 {
         struct smb2_file_rename_info info;
         void **data;
         unsigned int size[2];
         int rc;
         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
 
         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
         if (!data)
                 return -ENOMEM;
 
         info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
                               /* 0 = fail if target already exists */
         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
         info.FileNameLength = cpu_to_le32(len);
 
         data[0] = &info;
         size[0] = sizeof(struct smb2_file_rename_info);
 
         data[1] = target_file;
         size[1] = len + 2 /* null */;
 
         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
                            current->tgid, FILE_RENAME_INFORMATION, 2, data,
                            size);
         kfree(data);
         return rc;
 }
 
 int
 SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
                   u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
 {
         struct smb2_file_link_info info;
         void **data;
         unsigned int size[2];
         int rc;
         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
 
         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
         if (!data)
                 return -ENOMEM;
 
         info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
                               /* 0 = fail if link already exists */
         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
         info.FileNameLength = cpu_to_le32(len);
 
         data[0] = &info;
         size[0] = sizeof(struct smb2_file_link_info);
 
         data[1] = target_file;
         size[1] = len + 2 /* null */;
 
         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
                            current->tgid, FILE_LINK_INFORMATION, 2, data, size);
         kfree(data);
         return rc;
 }
 
 int
 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
              u64 volatile_fid, u32 pid, __le64 *eof)
 {
         struct smb2_file_eof_info info;
         void *data;
         unsigned int size;
 
         info.EndOfFile = *eof;
 
         data = &info;
         size = sizeof(struct smb2_file_eof_info);
 
         return send_set_info(xid, tcon, persistent_fid, volatile_fid, pid,
                              FILE_END_OF_FILE_INFORMATION, 1, &data, &size);
 }
 
 int
 SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
               u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
 {
         unsigned int size;
         size = sizeof(FILE_BASIC_INFO);
         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
                              current->tgid, FILE_BASIC_INFORMATION, 1,
                              (void **)&buf, &size);
 }
 
 int
 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
                   const u64 persistent_fid, const u64 volatile_fid,
                   __u8 oplock_level)
 {
         int rc;
         struct smb2_oplock_break *req = NULL;
 
         cifs_dbg(FYI, "SMB2_oplock_break\n");
         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
 
         if (rc)
                 return rc;
 
         req->VolatileFid = volatile_fid;
         req->PersistentFid = persistent_fid;
         req->OplockLevel = oplock_level;
         req->hdr.CreditRequest = cpu_to_le16(1);
 
         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
         /* SMB2 buffer freed by function above */
 
         if (rc) {
                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
         }
 
         return rc;
 }
 
 static void
 copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
                         struct kstatfs *kst)
 {
         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
         kst->f_bfree  = le64_to_cpu(pfs_inf->ActualAvailableAllocationUnits);
         kst->f_bavail = le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
         return;
 }
 
 static int
 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
 {
         int rc;
         struct smb2_query_info_req *req;
 
         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
 
         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
                 return -EIO;
 
         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
         if (rc)
                 return rc;
 
         req->InfoType = SMB2_O_INFO_FILESYSTEM;
         req->FileInfoClass = level;
         req->PersistentFileId = persistent_fid;
         req->VolatileFileId = volatile_fid;
         /* 4 for rfc1002 length field and 1 for pad */
         req->InputBufferOffset =
                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
         req->OutputBufferLength = cpu_to_le32(
                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - 4);
 
         iov->iov_base = (char *)req;
         /* 4 for rfc1002 length field */
         iov->iov_len = get_rfc1002_length(req) + 4;
         return 0;
 }
 
 int
 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
 {
         struct smb2_query_info_rsp *rsp = NULL;
         struct kvec iov;
         int rc = 0;
         int resp_buftype;
         struct cifs_ses *ses = tcon->ses;
         struct smb2_fs_full_size_info *info = NULL;
 
         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
                                 sizeof(struct smb2_fs_full_size_info),
                                 persistent_fid, volatile_fid);
         if (rc)
                 return rc;
 
         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
         if (rc) {
                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
                 goto qfsinf_exit;
         }
         rsp = (struct smb2_query_info_rsp *)iov.iov_base;
 
         info = (struct smb2_fs_full_size_info *)(4 /* RFC1001 len */ +
                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr);
         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
                           sizeof(struct smb2_fs_full_size_info));
         if (!rc)
                 copy_fs_info_to_kstatfs(info, fsdata);
 
 qfsinf_exit:
         free_rsp_buf(resp_buftype, iov.iov_base);
         return rc;
 }
 
 int
 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
               u64 persistent_fid, u64 volatile_fid, int level)
 {
         struct smb2_query_info_rsp *rsp = NULL;
         struct kvec iov;
         int rc = 0;
         int resp_buftype, max_len, min_len;
         struct cifs_ses *ses = tcon->ses;
         unsigned int rsp_len, offset;
 
         if (level == FS_DEVICE_INFORMATION) {
                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
         } else if (level == FS_ATTRIBUTE_INFORMATION) {
                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
                 min_len = MIN_FS_ATTR_INFO_SIZE;
         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
                 max_len = sizeof(struct smb3_fs_ss_info);
                 min_len = sizeof(struct smb3_fs_ss_info);
         } else {
                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
                 return -EINVAL;
         }
 
         rc = build_qfs_info_req(&iov, tcon, level, max_len,
                                 persistent_fid, volatile_fid);
         if (rc)
                 return rc;
 
         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
         if (rc) {
                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
                 goto qfsattr_exit;
         }
         rsp = (struct smb2_query_info_rsp *)iov.iov_base;
 
         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
         offset = le16_to_cpu(rsp->OutputBufferOffset);
         rc = validate_buf(offset, rsp_len, &rsp->hdr, min_len);
         if (rc)
                 goto qfsattr_exit;
 
         if (level == FS_ATTRIBUTE_INFORMATION)
                 memcpy(&tcon->fsAttrInfo, 4 /* RFC1001 len */ + offset
                         + (char *)&rsp->hdr, min_t(unsigned int,
                         rsp_len, max_len));
         else if (level == FS_DEVICE_INFORMATION)
                 memcpy(&tcon->fsDevInfo, 4 /* RFC1001 len */ + offset
                         + (char *)&rsp->hdr, sizeof(FILE_SYSTEM_DEVICE_INFO));
         else if (level == FS_SECTOR_SIZE_INFORMATION) {
                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
                         (4 /* RFC1001 len */ + offset + (char *)&rsp->hdr);
                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
                 tcon->perf_sector_size =
                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
         }
 
 qfsattr_exit:
         free_rsp_buf(resp_buftype, iov.iov_base);
         return rc;
 }
 
 int
 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
            const __u32 num_lock, struct smb2_lock_element *buf)
 {
         int rc = 0;
         struct smb2_lock_req *req = NULL;
         struct kvec iov[2];
         int resp_buf_type;
         unsigned int count;
 
         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
 
         rc = small_smb2_init(SMB2_LOCK, tcon, (void **) &req);
         if (rc)
                 return rc;
 
         req->hdr.ProcessId = cpu_to_le32(pid);
         req->LockCount = cpu_to_le16(num_lock);
 
         req->PersistentFileId = persist_fid;
         req->VolatileFileId = volatile_fid;
 
         count = num_lock * sizeof(struct smb2_lock_element);
         inc_rfc1001_len(req, count - sizeof(struct smb2_lock_element));
 
         iov[0].iov_base = (char *)req;
         /* 4 for rfc1002 length field and count for all locks */
         iov[0].iov_len = get_rfc1002_length(req) + 4 - count;
         iov[1].iov_base = (char *)buf;
         iov[1].iov_len = count;
 
         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
         rc = SendReceive2(xid, tcon->ses, iov, 2, &resp_buf_type, CIFS_NO_RESP);
         if (rc) {
                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
         }
 
         return rc;
 }
 
 int
 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
           const __u64 length, const __u64 offset, const __u32 lock_flags,
           const bool wait)
 {
         struct smb2_lock_element lock;
 
         lock.Offset = cpu_to_le64(offset);
         lock.Length = cpu_to_le64(length);
         lock.Flags = cpu_to_le32(lock_flags);
         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
 
         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
 }
 
 int
 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
                  __u8 *lease_key, const __le32 lease_state)
 {
         int rc;
         struct smb2_lease_ack *req = NULL;
 
         cifs_dbg(FYI, "SMB2_lease_break\n");
         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
 
         if (rc)
                 return rc;
 
         req->hdr.CreditRequest = cpu_to_le16(1);
         req->StructureSize = cpu_to_le16(36);
         inc_rfc1001_len(req, 12);
 
         memcpy(req->LeaseKey, lease_key, 16);
         req->LeaseState = lease_state;
 
         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
         /* SMB2 buffer freed by function above */
 
         if (rc) {
                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
         }
 
         return rc;
 }
 

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