/*
 *   fs/cifs/cifssmb.c
 *
 *   Copyright (C) International Business Machines  Corp., 2002,2010
 *   Author(s): Steve French (sfrench@us.ibm.com)
 *
 *   Contains the routines for constructing the SMB 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
 */

 /* SMB/CIFS PDU handling routines here - except for leftovers in connect.c   */
 /* These are mostly routines that operate on a pathname, or on a tree id     */
 /* (mounted volume), but there are eight 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/slab.h>
#include <linux/posix_acl_xattr.h>
#include <asm/uaccess.h>
#include "cifspdu.h"
#include "cifsglob.h"
#include "cifsacl.h"
#include "cifsproto.h"
#include "cifs_unicode.h"
#include "cifs_debug.h"

#ifdef CONFIG_CIFS_POSIX
static struct {
        int index;
        char *name;
} protocols[] = {
#ifdef CONFIG_CIFS_WEAK_PW_HASH
        {LANMAN_PROT, "\2LM1.2X002"},
        {LANMAN2_PROT, "\2LANMAN2.1"},
#endif /* weak password hashing for legacy clients */
        {CIFS_PROT, "\2NT LM 0.12"},
        {POSIX_PROT, "\2POSIX 2"},
        {BAD_PROT, "\2"}
};
#else
static struct {
        int index;
        char *name;
} protocols[] = {
#ifdef CONFIG_CIFS_WEAK_PW_HASH
        {LANMAN_PROT, "\2LM1.2X002"},
        {LANMAN2_PROT, "\2LANMAN2.1"},
#endif /* weak password hashing for legacy clients */
        {CIFS_PROT, "\2NT LM 0.12"},
        {BAD_PROT, "\2"}
};
#endif

/* define the number of elements in the cifs dialect array */
#ifdef CONFIG_CIFS_POSIX
#ifdef CONFIG_CIFS_WEAK_PW_HASH
#define CIFS_NUM_PROT 4
#else
#define CIFS_NUM_PROT 2
#endif /* CIFS_WEAK_PW_HASH */
#else /* not posix */
#ifdef CONFIG_CIFS_WEAK_PW_HASH
#define CIFS_NUM_PROT 3
#else
#define CIFS_NUM_PROT 1
#endif /* CONFIG_CIFS_WEAK_PW_HASH */
#endif /* CIFS_POSIX */

/* Mark as invalid, all open files on tree connections since they
   were closed when session to server was lost */
static void mark_open_files_invalid(struct cifsTconInfo *pTcon)
{
        struct cifsFileInfo *open_file = NULL;
        struct list_head *tmp;
        struct list_head *tmp1;

/* list all files open on tree connection and mark them invalid */
        spin_lock(&cifs_file_list_lock);
        list_for_each_safe(tmp, tmp1, &pTcon->openFileList) {
                open_file = list_entry(tmp, struct cifsFileInfo, tlist);
                open_file->invalidHandle = true;
                open_file->oplock_break_cancelled = true;
        }
        spin_unlock(&cifs_file_list_lock);
        /* BB Add call to invalidate_inodes(sb) for all superblocks mounted
           to this tcon */
}

/* reconnect the socket, tcon, and smb session if needed */
static int
cifs_reconnect_tcon(struct cifsTconInfo *tcon, int smb_command)
{
        int rc = 0;
        struct cifsSesInfo *ses;
        struct TCP_Server_Info *server;
        struct nls_table *nls_codepage;

        /*
         * SMBs NegProt, SessSetup, uLogoff do not have tcon yet so check for
         * tcp and smb session status done differently for those three - in the
         * calling routine
         */
        if (!tcon)
                return 0;

        ses = tcon->ses;
        server = ses->server;

        /*
         * only tree disconnect, open, and write, (and ulogoff which does not
         * have tcon) are allowed as we start force umount
         */
        if (tcon->tidStatus == CifsExiting) {
                if (smb_command != SMB_COM_WRITE_ANDX &&
                    smb_command != SMB_COM_OPEN_ANDX &&
                    smb_command != SMB_COM_TREE_DISCONNECT) {
                        cFYI(1, "can not send cmd %d while umounting",
                                smb_command);
                        return -ENODEV;
                }
        }

        /*
         * Give demultiplex thread up to 10 seconds to reconnect, should be
         * greater than cifs socket timeout which is 7 seconds
         */
        while (server->tcpStatus == CifsNeedReconnect) {
                wait_event_interruptible_timeout(server->response_q,
                        (server->tcpStatus == CifsGood), 10 * HZ);

                /* is TCP session is reestablished now ?*/
                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) {
                        cFYI(1, "gave up waiting on reconnect in smb_init");
                        return -EHOSTDOWN;
                }
        }

        if (!ses->need_reconnect && !tcon->need_reconnect)
                return 0;

        nls_codepage = load_nls_default();

        /*
         * need to prevent multiple threads trying to simultaneously
         * reconnect the same SMB session
         */
        mutex_lock(&ses->session_mutex);
        rc = cifs_negotiate_protocol(0, ses);
        if (rc == 0 && ses->need_reconnect)
                rc = cifs_setup_session(0, ses, nls_codepage);

        /* do we need to reconnect tcon? */
        if (rc || !tcon->need_reconnect) {
                mutex_unlock(&ses->session_mutex);
                goto out;
        }

        mark_open_files_invalid(tcon);
        rc = CIFSTCon(0, ses, tcon->treeName, tcon, nls_codepage);
        mutex_unlock(&ses->session_mutex);
        cFYI(1, "reconnect tcon rc = %d", rc);

        if (rc)
                goto out;

        /*
         * FIXME: check if wsize needs updated due to negotiated smb buffer
         *        size shrinking
         */
        atomic_inc(&tconInfoReconnectCount);

        /* tell server Unix caps we support */
        if (ses->capabilities & CAP_UNIX)
                reset_cifs_unix_caps(0, tcon, NULL, NULL);

        /*
         * Removed call to reopen open files here. It is safer (and faster) to
         * reopen files one at a time as needed in read and write.
         *
         * FIXME: what about file locks? don't we need to reclaim them ASAP?
         */

out:
        /*
         * Check if handle based operation so we know whether we can continue
         * or not without returning to caller to reset file handle
         */
        switch (smb_command) {
        case SMB_COM_READ_ANDX:
        case SMB_COM_WRITE_ANDX:
        case SMB_COM_CLOSE:
        case SMB_COM_FIND_CLOSE2:
        case SMB_COM_LOCKING_ANDX:
                rc = -EAGAIN;
        }

        unload_nls(nls_codepage);
        return rc;
}

/* Allocate and return pointer to an SMB request buffer, 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_smb_init(int smb_command, int wct, struct cifsTconInfo *tcon,
                void **request_buf)
{
        int rc;

        rc = cifs_reconnect_tcon(tcon, smb_command);
        if (rc)
                return rc;

        *request_buf = cifs_small_buf_get();
        if (*request_buf == NULL) {
                /* BB should we add a retry in here if not a writepage? */
                return -ENOMEM;
        }

        header_assemble((struct smb_hdr *) *request_buf, smb_command,
                        tcon, wct);

        if (tcon != NULL)
                cifs_stats_inc(&tcon->num_smbs_sent);

        return 0;
}

int
small_smb_init_no_tc(const int smb_command, const int wct,
                     struct cifsSesInfo *ses, void **request_buf)
{
        int rc;
        struct smb_hdr *buffer;

        rc = small_smb_init(smb_command, wct, NULL, request_buf);
        if (rc)
                return rc;

        buffer = (struct smb_hdr *)*request_buf;
        buffer->Mid = GetNextMid(ses->server);
        if (ses->capabilities & CAP_UNICODE)
                buffer->Flags2 |= SMBFLG2_UNICODE;
        if (ses->capabilities & CAP_STATUS32)
                buffer->Flags2 |= SMBFLG2_ERR_STATUS;

        /* uid, tid can stay at zero as set in header assemble */

        /* BB add support for turning on the signing when
        this function is used after 1st of session setup requests */

        return rc;
}

/* If the return code is zero, this function must fill in request_buf pointer */
static int
__smb_init(int smb_command, int wct, struct cifsTconInfo *tcon,
                        void **request_buf, void **response_buf)
{
        *request_buf = cifs_buf_get();
        if (*request_buf == NULL) {
                /* BB should we add a retry in here if not a writepage? */
                return -ENOMEM;
        }
    /* Although the original thought was we needed the response buf for  */
    /* potential retries of smb operations it turns out we can determine */
    /* from the mid flags when the request buffer can be resent without  */
    /* having to use a second distinct buffer for the response */
        if (response_buf)
                *response_buf = *request_buf;

        header_assemble((struct smb_hdr *) *request_buf, smb_command, tcon,
                        wct);

        if (tcon != NULL)
                cifs_stats_inc(&tcon->num_smbs_sent);

        return 0;
}

/* If the return code is zero, this function must fill in request_buf pointer */
static int
smb_init(int smb_command, int wct, struct cifsTconInfo *tcon,
         void **request_buf, void **response_buf)
{
        int rc;

        rc = cifs_reconnect_tcon(tcon, smb_command);
        if (rc)
                return rc;

        return __smb_init(smb_command, wct, tcon, request_buf, response_buf);
}

static int
smb_init_no_reconnect(int smb_command, int wct, struct cifsTconInfo *tcon,
                        void **request_buf, void **response_buf)
{
        if (tcon->ses->need_reconnect || tcon->need_reconnect)
                return -EHOSTDOWN;

        return __smb_init(smb_command, wct, tcon, request_buf, response_buf);
}

static int validate_t2(struct smb_t2_rsp *pSMB)
{
        unsigned int total_size;

        /* check for plausible wct */
        if (pSMB->hdr.WordCount < 10)
                goto vt2_err;

        /* check for parm and data offset going beyond end of smb */
        if (get_unaligned_le16(&pSMB->t2_rsp.ParameterOffset) > 1024 ||
            get_unaligned_le16(&pSMB->t2_rsp.DataOffset) > 1024)
                goto vt2_err;

        /* check that bcc is at least as big as parms + data */
        /* check that bcc is less than negotiated smb buffer */
        total_size = get_unaligned_le16(&pSMB->t2_rsp.ParameterCount);
        if (total_size >= 512)
                goto vt2_err;

        total_size += get_unaligned_le16(&pSMB->t2_rsp.DataCount);
        if (total_size > get_bcc(&pSMB->hdr) ||
            total_size >= CIFSMaxBufSize + MAX_CIFS_HDR_SIZE)
                goto vt2_err;

        return 0;
vt2_err:
        cifs_dump_mem("Invalid transact2 SMB: ", (char *)pSMB,
                sizeof(struct smb_t2_rsp) + 16);
        return -EINVAL;
}

int
CIFSSMBNegotiate(unsigned int xid, struct cifsSesInfo *ses)
{
        NEGOTIATE_REQ *pSMB;
        NEGOTIATE_RSP *pSMBr;
        int rc = 0;
        int bytes_returned;
        int i;
        struct TCP_Server_Info *server;
        u16 count;
        unsigned int secFlags;

        if (ses->server)
                server = ses->server;
        else {
                rc = -EIO;
                return rc;
        }
        rc = smb_init(SMB_COM_NEGOTIATE, 0, NULL /* no tcon yet */ ,
                      (void **) &pSMB, (void **) &pSMBr);
        if (rc)
                return rc;

        /* if any of auth flags (ie not sign or seal) are overriden use them */
        if (ses->overrideSecFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL)))
                secFlags = ses->overrideSecFlg;  /* BB FIXME fix sign flags? */
        else /* if override flags set only sign/seal OR them with global auth */
                secFlags = global_secflags | ses->overrideSecFlg;

        cFYI(1, "secFlags 0x%x", secFlags);

        pSMB->hdr.Mid = GetNextMid(server);
        pSMB->hdr.Flags2 |= (SMBFLG2_UNICODE | SMBFLG2_ERR_STATUS);

        if ((secFlags & CIFSSEC_MUST_KRB5) == CIFSSEC_MUST_KRB5)
                pSMB->hdr.Flags2 |= SMBFLG2_EXT_SEC;
        else if ((secFlags & CIFSSEC_AUTH_MASK) == CIFSSEC_MAY_KRB5) {
                cFYI(1, "Kerberos only mechanism, enable extended security");
                pSMB->hdr.Flags2 |= SMBFLG2_EXT_SEC;
        } else if ((secFlags & CIFSSEC_MUST_NTLMSSP) == CIFSSEC_MUST_NTLMSSP)
                pSMB->hdr.Flags2 |= SMBFLG2_EXT_SEC;
        else if ((secFlags & CIFSSEC_AUTH_MASK) == CIFSSEC_MAY_NTLMSSP) {
                cFYI(1, "NTLMSSP only mechanism, enable extended security");
                pSMB->hdr.Flags2 |= SMBFLG2_EXT_SEC;
        }

        count = 0;
        for (i = 0; i < CIFS_NUM_PROT; i++) {
                strncpy(pSMB->DialectsArray+count, protocols[i].name, 16);
                count += strlen(protocols[i].name) + 1;
                /* null at end of source and target buffers anyway */
        }
        pSMB->hdr.smb_buf_length += count;
        pSMB->ByteCount = cpu_to_le16(count);

        rc = SendReceive(xid, ses, (struct smb_hdr *) pSMB,
                         (struct smb_hdr *) pSMBr, &bytes_returned, 0);
        if (rc != 0)
                goto neg_err_exit;

        server->dialect = le16_to_cpu(pSMBr->DialectIndex);
        cFYI(1, "Dialect: %d", server->dialect);
        /* Check wct = 1 error case */
        if ((pSMBr->hdr.WordCount < 13) || (server->dialect == BAD_PROT)) {
                /* core returns wct = 1, but we do not ask for core - otherwise
                small wct just comes when dialect index is -1 indicating we
                could not negotiate a common dialect */
                rc = -EOPNOTSUPP;
                goto neg_err_exit;
#ifdef CONFIG_CIFS_WEAK_PW_HASH
        } else if ((pSMBr->hdr.WordCount == 13)
                        && ((server->dialect == LANMAN_PROT)
                                || (server->dialect == LANMAN2_PROT))) {
                __s16 tmp;
                struct lanman_neg_rsp *rsp = (struct lanman_neg_rsp *)pSMBr;

                if ((secFlags & CIFSSEC_MAY_LANMAN) ||
                        (secFlags & CIFSSEC_MAY_PLNTXT))
                        server->secType = LANMAN;
                else {
                        cERROR(1, "mount failed weak security disabled"
                                   " in /proc/fs/cifs/SecurityFlags");
                        rc = -EOPNOTSUPP;
                        goto neg_err_exit;
                }
                server->secMode = (__u8)le16_to_cpu(rsp->SecurityMode);
                server->maxReq = le16_to_cpu(rsp->MaxMpxCount);
                server->maxBuf = min((__u32)le16_to_cpu(rsp->MaxBufSize),
                                (__u32)CIFSMaxBufSize + MAX_CIFS_HDR_SIZE);
                server->max_vcs = le16_to_cpu(rsp->MaxNumberVcs);
                /* even though we do not use raw we might as well set this
                accurately, in case we ever find a need for it */
                if ((le16_to_cpu(rsp->RawMode) & RAW_ENABLE) == RAW_ENABLE) {
                        server->max_rw = 0xFF00;
                        server->capabilities = CAP_MPX_MODE | CAP_RAW_MODE;
                } else {
                        server->max_rw = 0;/* do not need to use raw anyway */
                        server->capabilities = CAP_MPX_MODE;
                }
                tmp = (__s16)le16_to_cpu(rsp->ServerTimeZone);
                if (tmp == -1) {
                        /* OS/2 often does not set timezone therefore
                         * we must use server time to calc time zone.
                         * Could deviate slightly from the right zone.
                         * Smallest defined timezone difference is 15 minutes
                         * (i.e. Nepal).  Rounding up/down is done to match
                         * this requirement.
                         */
                        int val, seconds, remain, result;
                        struct timespec ts, utc;
                        utc = CURRENT_TIME;
                        ts = cnvrtDosUnixTm(rsp->SrvTime.Date,
                                            rsp->SrvTime.Time, 0);
                        cFYI(1, "SrvTime %d sec since 1970 (utc: %d) diff: %d",
                                (int)ts.tv_sec, (int)utc.tv_sec,
                                (int)(utc.tv_sec - ts.tv_sec));
                        val = (int)(utc.tv_sec - ts.tv_sec);
                        seconds = abs(val);
                        result = (seconds / MIN_TZ_ADJ) * MIN_TZ_ADJ;
                        remain = seconds % MIN_TZ_ADJ;
                        if (remain >= (MIN_TZ_ADJ / 2))
                                result += MIN_TZ_ADJ;
                        if (val < 0)
                                result = -result;
                        server->timeAdj = result;
                } else {
                        server->timeAdj = (int)tmp;
                        server->timeAdj *= 60; /* also in seconds */
                }
                cFYI(1, "server->timeAdj: %d seconds", server->timeAdj);


                /* BB get server time for time conversions and add
                code to use it and timezone since this is not UTC */

                if (rsp->EncryptionKeyLength ==
                                cpu_to_le16(CIFS_CRYPTO_KEY_SIZE)) {
                        memcpy(ses->server->cryptkey, rsp->EncryptionKey,
                                CIFS_CRYPTO_KEY_SIZE);
                } else if (server->secMode & SECMODE_PW_ENCRYPT) {
                        rc = -EIO; /* need cryptkey unless plain text */
                        goto neg_err_exit;
                }

                cFYI(1, "LANMAN negotiated");
                /* we will not end up setting signing flags - as no signing
                was in LANMAN and server did not return the flags on */
                goto signing_check;
#else /* weak security disabled */
        } else if (pSMBr->hdr.WordCount == 13) {
                cERROR(1, "mount failed, cifs module not built "
                          "with CIFS_WEAK_PW_HASH support");
                rc = -EOPNOTSUPP;
#endif /* WEAK_PW_HASH */
                goto neg_err_exit;
        } else if (pSMBr->hdr.WordCount != 17) {
                /* unknown wct */
                rc = -EOPNOTSUPP;
                goto neg_err_exit;
        }
        /* else wct == 17 NTLM */
        server->secMode = pSMBr->SecurityMode;
        if ((server->secMode & SECMODE_USER) == 0)
                cFYI(1, "share mode security");

        if ((server->secMode & SECMODE_PW_ENCRYPT) == 0)
#ifdef CONFIG_CIFS_WEAK_PW_HASH
                if ((secFlags & CIFSSEC_MAY_PLNTXT) == 0)
#endif /* CIFS_WEAK_PW_HASH */
                        cERROR(1, "Server requests plain text password"
                                  " but client support disabled");

        if ((secFlags & CIFSSEC_MUST_NTLMV2) == CIFSSEC_MUST_NTLMV2)
                server->secType = NTLMv2;
        else if (secFlags & CIFSSEC_MAY_NTLM)
                server->secType = NTLM;
        else if (secFlags & CIFSSEC_MAY_NTLMV2)
                server->secType = NTLMv2;
        else if (secFlags & CIFSSEC_MAY_KRB5)
                server->secType = Kerberos;
        else if (secFlags & CIFSSEC_MAY_NTLMSSP)
                server->secType = RawNTLMSSP;
        else if (secFlags & CIFSSEC_MAY_LANMAN)
                server->secType = LANMAN;
/* #ifdef CONFIG_CIFS_EXPERIMENTAL
        else if (secFlags & CIFSSEC_MAY_PLNTXT)
                server->secType = ??
#endif */
        else {
                rc = -EOPNOTSUPP;
                cERROR(1, "Invalid security type");
                goto neg_err_exit;
        }
        /* else ... any others ...? */

        /* one byte, so no need to convert this or EncryptionKeyLen from
           little endian */
        server->maxReq = le16_to_cpu(pSMBr->MaxMpxCount);
        /* probably no need to store and check maxvcs */
        server->maxBuf = min(le32_to_cpu(pSMBr->MaxBufferSize),
                        (__u32) CIFSMaxBufSize + MAX_CIFS_HDR_SIZE);
        server->max_rw = le32_to_cpu(pSMBr->MaxRawSize);
        cFYI(DBG2, "Max buf = %d", ses->server->maxBuf);
        server->capabilities = le32_to_cpu(pSMBr->Capabilities);
        server->timeAdj = (int)(__s16)le16_to_cpu(pSMBr->ServerTimeZone);
        server->timeAdj *= 60;
        if (pSMBr->EncryptionKeyLength == CIFS_CRYPTO_KEY_SIZE) {
                memcpy(ses->server->cryptkey, pSMBr->u.EncryptionKey,
                       CIFS_CRYPTO_KEY_SIZE);
        } else if ((pSMBr->hdr.Flags2 & SMBFLG2_EXT_SEC)
                        && (pSMBr->EncryptionKeyLength == 0)) {
                /* decode security blob */
        } else if (server->secMode & SECMODE_PW_ENCRYPT) {
                rc = -EIO; /* no crypt key only if plain text pwd */
                goto neg_err_exit;
        }

        /* BB might be helpful to save off the domain of server here */

        if ((pSMBr->hdr.Flags2 & SMBFLG2_EXT_SEC) &&
                (server->capabilities & CAP_EXTENDED_SECURITY)) {
                count = pSMBr->ByteCount;
                if (count < 16) {
                        rc = -EIO;
                        goto neg_err_exit;
                }
                spin_lock(&cifs_tcp_ses_lock);
                if (server->srv_count > 1) {
                        spin_unlock(&cifs_tcp_ses_lock);
                        if (memcmp(server->server_GUID,
                                   pSMBr->u.extended_response.
                                   GUID, 16) != 0) {
                                cFYI(1, "server UID changed");
                                memcpy(server->server_GUID,
                                        pSMBr->u.extended_response.GUID,
                                        16);
                        }
                } else {
                        spin_unlock(&cifs_tcp_ses_lock);
                        memcpy(server->server_GUID,
                               pSMBr->u.extended_response.GUID, 16);
                }

                if (count == 16) {
                        server->secType = RawNTLMSSP;
                } else {
                        rc = decode_negTokenInit(pSMBr->u.extended_response.
                                                 SecurityBlob, count - 16,
                                                 server);
                        if (rc == 1)
                                rc = 0;
                        else
                                rc = -EINVAL;
                        if (server->secType == Kerberos) {
                                if (!server->sec_kerberos &&
                                                !server->sec_mskerberos)
                                        rc = -EOPNOTSUPP;
                        } else if (server->secType == RawNTLMSSP) {
                                if (!server->sec_ntlmssp)
                                        rc = -EOPNOTSUPP;
                        } else
                                        rc = -EOPNOTSUPP;
                }
        } else
                server->capabilities &= ~CAP_EXTENDED_SECURITY;

#ifdef CONFIG_CIFS_WEAK_PW_HASH
signing_check:
#endif
        if ((secFlags & CIFSSEC_MAY_SIGN) == 0) {
                /* MUST_SIGN already includes the MAY_SIGN FLAG
                   so if this is zero it means that signing is disabled */
                cFYI(1, "Signing disabled");
                if (server->secMode & SECMODE_SIGN_REQUIRED) {
                        cERROR(1, "Server requires "
                                   "packet signing to be enabled in "
                                   "/proc/fs/cifs/SecurityFlags.");
                        rc = -EOPNOTSUPP;
                }
                server->secMode &=
                        ~(SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED);
        } else if ((secFlags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN) {
                /* signing required */
                cFYI(1, "Must sign - secFlags 0x%x", secFlags);
                if ((server->secMode &
                        (SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED)) == 0) {
                        cERROR(1, "signing required but server lacks support");
                        rc = -EOPNOTSUPP;
                } else
                        server->secMode |= SECMODE_SIGN_REQUIRED;
        } else {
                /* signing optional ie CIFSSEC_MAY_SIGN */
                if ((server->secMode & SECMODE_SIGN_REQUIRED) == 0)
                        server->secMode &=
                                ~(SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED);
        }

neg_err_exit:
        cifs_buf_release(pSMB);

        cFYI(1, "negprot rc %d", rc);
        return rc;
}

int
CIFSSMBTDis(const int xid, struct cifsTconInfo *tcon)
{
        struct smb_hdr *smb_buffer;
        int rc = 0;

        cFYI(1, "In tree disconnect");

        /* BB: do we need to check this? These should never be NULL. */
        if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
                return -EIO;

        /*
         * No need to return error on this operation if tid invalidated and
         * closed on server already e.g. due to tcp session crashing. Also,
         * the tcon is no longer on the list, so no need to take lock before
         * checking this.
         */
        if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
                return 0;

        rc = small_smb_init(SMB_COM_TREE_DISCONNECT, 0, tcon,
                            (void **)&smb_buffer);
        if (rc)
                return rc;

        rc = SendReceiveNoRsp(xid, tcon->ses, smb_buffer, 0);
        if (rc)
                cFYI(1, "Tree disconnect failed %d", rc);

        /* No need to return error on this operation if tid invalidated and
           closed on server already e.g. due to tcp session crashing */
        if (rc == -EAGAIN)
                rc = 0;

        return rc;
}

/*
 * 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
cifs_echo_callback(struct mid_q_entry *mid)
{
        struct TCP_Server_Info *server = mid->callback_data;

        DeleteMidQEntry(mid);
        atomic_dec(&server->inFlight);
        wake_up(&server->request_q);
}

int
CIFSSMBEcho(struct TCP_Server_Info *server)
{
        ECHO_REQ *smb;
        int rc = 0;

        cFYI(1, "In echo request");

        rc = small_smb_init(SMB_COM_ECHO, 0, NULL, (void **)&smb);
        if (rc)
                return rc;

        /* set up echo request */
        smb->hdr.Tid = cpu_to_le16(0xffff);
        smb->hdr.WordCount = 1;
        put_unaligned_le16(1, &smb->EchoCount);
        put_bcc_le(1, &smb->hdr);
        smb->Data[0] = 'a';
        smb->hdr.smb_buf_length += 3;

        rc = cifs_call_async(server, (struct smb_hdr *)smb,
                                cifs_echo_callback, server);
        if (rc)
                cFYI(1, "Echo request failed: %d", rc);

        cifs_small_buf_release(smb);

        return rc;
}

int
CIFSSMBLogoff(const int xid, struct cifsSesInfo *ses)
{
        LOGOFF_ANDX_REQ *pSMB;
        int rc = 0;

        cFYI(1, "In SMBLogoff for session disconnect");

        /*
         * BB: do we need to check validity of ses and server? They should
         * always be valid since we have an active reference. If not, that
         * should probably be a BUG()
         */
        if (!ses || !ses->server)
                return -EIO;

        mutex_lock(&ses->session_mutex);
        if (ses->need_reconnect)
                goto session_already_dead; /* no need to send SMBlogoff if uid
                                              already closed due to reconnect */
        rc = small_smb_init(SMB_COM_LOGOFF_ANDX, 2, NULL, (void **)&pSMB);
        if (rc) {
                mutex_unlock(&ses->session_mutex);
                return rc;
        }

        pSMB->hdr.Mid = GetNextMid(ses->server);

        if (ses->server->secMode &
                   (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
                        pSMB->hdr.Flags2 |= SMBFLG2_SECURITY_SIGNATURE;

        pSMB->hdr.Uid = ses->Suid;

        pSMB->AndXCommand = 0xFF;
        rc = SendReceiveNoRsp(xid, ses, (struct smb_hdr *) pSMB, 0);
session_already_dead:
        mutex_unlock(&ses->session_mutex);

        /* if session dead then we do not need to do ulogoff,
                since server closed smb session, no sense reporting
                error */
        if (rc == -EAGAIN)
                rc = 0;
        return rc;
}

int
CIFSPOSIXDelFile(const int xid, struct cifsTconInfo *tcon, const char *fileName,
                 __u16 type, const struct nls_table *nls_codepage, int remap)
{
        TRANSACTION2_SPI_REQ *pSMB = NULL;
        TRANSACTION2_SPI_RSP *pSMBr = NULL;
        struct unlink_psx_rq *pRqD;
        int name_len;
        int rc = 0;
        int bytes_returned = 0;
        __u16 params, param_offset, offset, byte_count;

        cFYI(1, "In POSIX delete");
PsxDelete:
        rc = smb_init(SMB_COM_TRANSACTION2, 15, tcon, (void **) &pSMB,
                      (void **) &pSMBr);
        if (rc)
                return rc;

        if (pSMB->hdr.Flags2 & SMBFLG2_UNICODE) {
                name_len =
                    cifsConvertToUCS((__le16 *) pSMB->FileName, fileName,
                                     PATH_MAX, nls_codepage, remap);
                name_len++;     /* trailing null */
                name_len *= 2;
        } else { /* BB add path length overrun check */
                name_len = strnlen(fileName, PATH_MAX);
                name_len++;     /* trailing null */
                strncpy(pSMB->FileName, fileName, name_len);
        }

        params = 6 + name_len;
        pSMB->MaxParameterCount = cpu_to_le16(2);
        pSMB->MaxDataCount = 0; /* BB double check this with jra */
        pSMB->MaxSetupCount = 0;
        pSMB->Reserved = 0;
        pSMB->Flags = 0;
        pSMB->Timeout = 0;
        pSMB->Reserved2 = 0;
        param_offset = offsetof(struct smb_com_transaction2_spi_req,
                                InformationLevel) - 4;
        offset = param_offset + params;

        /* Setup pointer to Request Data (inode type) */
        pRqD = (struct unlink_psx_rq *)(((char *)&pSMB->hdr.Protocol) + offset);
        pRqD->type = cpu_to_le16(type);
        pSMB->ParameterOffset = cpu_to_le16(param_offset);
        pSMB->DataOffset = cpu_to_le16(offset);
        pSMB->SetupCount = 1;
        pSMB->Reserved3 = 0;
        pSMB->SubCommand = cpu_to_le16(TRANS2_SET_PATH_INFORMATION);
        byte_count = 3 /* pad */  + params + sizeof(struct unlink_psx_rq);

        pSMB->DataCount = cpu_to_le16(sizeof(struct unlink_psx_rq));
        pSMB->TotalDataCount = cpu_to_le16(sizeof(struct unlink_psx_rq));
        pSMB->ParameterCount = cpu_to_le16(params);
        pSMB->TotalParameterCount = pSMB->ParameterCount;
        pSMB->InformationLevel = cpu_to_le16(SMB_POSIX_UNLINK);
        pSMB->Reserved4 = 0;
        pSMB->hdr.smb_buf_length += byte_count;
        pSMB->ByteCount = cpu_to_le16(byte_count);
        rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
                         (struct smb_hdr *) pSMBr, &bytes_returned, 0);
        if (rc)
                cFYI(1, "Posix delete returned %d", rc);
        cifs_buf_release(pSMB);

        cifs_stats_inc(&tcon->num_deletes);

        if (rc == -EAGAIN)
                goto PsxDelete;

        return rc;
}

int
CIFSSMBDelFile(const int xid, struct cifsTconInfo *tcon, const char *fileName,
               const struct nls_table *nls_codepage, int remap)
{
        DELETE_FILE_REQ *pSMB = NULL;
        DELETE_FILE_RSP *pSMBr = NULL;
        int rc = 0;
        int bytes_returned;
        int name_len;

DelFileRetry:
        rc = smb_init(SMB_COM_DELETE, 1, tcon, (void **) &pSMB,
                      (void **) &pSMBr);
        if (rc)
                return rc;

        if (pSMB->hdr.Flags2 & SMBFLG2_UNICODE) {
                name_len =
                    cifsConvertToUCS((__le16 *) pSMB->fileName, fileName,
                                     PATH_MAX, nls_codepage, remap);
                name_len++;     /* trailing null */
                name_len *= 2;
        } else {                /* BB improve check for buffer overruns BB */
                name_len = strnlen(fileName, PATH_MAX);
                name_len++;     /* trailing null */
                strncpy(pSMB->fileName, fileName, name_len);
        }
        pSMB->SearchAttributes =
            cpu_to_le16(ATTR_READONLY | ATTR_HIDDEN | ATTR_SYSTEM);
        pSMB->BufferFormat = 0x04;
        pSMB->hdr.smb_buf_length += name_len + 1;
        pSMB->ByteCount = cpu_to_le16(name_len + 1);
        rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
                         (struct smb_hdr *) pSMBr, &bytes_returned, 0);
        cifs_stats_inc(&tcon->num_deletes);
        if (rc)
                cFYI(1, "Error in RMFile = %d", rc);

        cifs_buf_release(pSMB);
        if (rc == -EAGAIN)
                goto DelFileRetry;

        return rc;
}

int
CIFSSMBRmDir(const int xid, struct cifsTconInfo *tcon, const char *dirName,
             const struct nls_table *nls_codepage, int remap)
{
        DELETE_DIRECTORY_REQ *pSMB = NULL;
        DELETE_DIRECTORY_RSP *pSMBr = NULL;
        int rc = 0;
        int bytes_returned;
        int name_len;

        cFYI(1, "In CIFSSMBRmDir");
RmDirRetry:
        rc = smb_init(SMB_COM_DELETE_DIRECTORY, 0, tcon, (void **) &pSMB,
                      (void **) &pSMBr);
        if (rc)
                return rc;

        if (pSMB->hdr.Flags2 & SMBFLG2_UNICODE) {
                name_len = cifsConvertToUCS((__le16 *) pSMB->DirName, dirName,
                                         PATH_MAX, nls_codepage, remap);
                name_len++;     /* trailing null */
                name_len *= 2;
        } else {                /* BB improve check for buffer overruns BB */
                name_len = strnlen(dirName, PATH_MAX);
                name_len++;     /* trailing null */
                strncpy(pSMB->DirName, dirName, name_len);
        }

        pSMB->BufferFormat = 0x04;
        pSMB->hdr.smb_buf_length += name_len + 1;
        pSMB->ByteCount = cpu_to_le16(name_len + 1);
        rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
                         (struct smb_hdr *) pSMBr, &bytes_returned, 0);
        cifs_stats_inc(&tcon->num_rmdirs);
        if (rc)
                cFYI(1, "Error in RMDir = %d", rc);

        cifs_buf_release(pSMB);
        if (rc == -EAGAIN)
                goto RmDirRetry;
        return rc;
}

int
CIFSSMBMkDir(const int xid, struct cifsTconInfo *tcon,
             const char *name, const struct nls_table *nls_codepage, int remap)
{
        int rc = 0;
        CREATE_DIRECTORY_REQ *pSMB = NULL;
        CREATE_DIRECTORY_RSP *pSMBr = NULL;
        int bytes_returned;
        int name_len;

        cFYI(1, "In CIFSSMBMkDir");
MkDirRetry:
        rc = smb_init(SMB_COM_CREATE_DIRECTORY, 0, tcon, (void **) &pSMB,
                      (void **) &pSMBr);
        if (rc)
                return rc;

        if (pSMB->hdr.Flags2 & SMBFLG2_UNICODE) {
                name_len = cifsConvertToUCS((__le16 *) pSMB->DirName, name,
                                            PATH_MAX, nls_codepage, remap);
                name_len++;     /* trailing null */
                name_len *= 2;
        } else {                /* BB improve check for buffer overruns BB */
                name_len = strnlen(name, PATH_MAX);
                name_len++;     /* trailing null */
                strncpy(pSMB->DirName, name, name_len);
        }

        pSMB->BufferFormat = 0x04;
        pSMB->hdr.smb_buf_length += name_len + 1;
        pSMB->ByteCount = cpu_to_le16(name_len + 1);
        rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
                         (struct smb_hdr *) pSMBr, &bytes_returned, 0);
        cifs_stats_inc(&tcon->num_mkdirs);
        if (rc)
                cFYI(1, "Error in Mkdir = %d", rc);

        cifs_buf_release(pSMB);
        if (rc == -EAGAIN)
                goto MkDirRetry;
        return rc;
}

int
CIFSPOSIXCreate(const int xid, struct cifsTconInfo *tcon, __u32 posix_flags,
                __u64 mode, __u16 *netfid, FILE_UNIX_BASIC_INFO *pRetData,
                __u32 *pOplock, const char *name,
                const struct nls_table *nls_codepage, int remap)
{
        TRANSACTION2_SPI_REQ *pSMB = NULL;
        TRANSACTION2_SPI_RSP *pSMBr = NULL;
        int name_len;
        int rc = 0;
        int bytes_returned = 0;
        __u16 params, param_offset, offset, byte_count, count;
        OPEN_PSX_REQ *pdata;
        OPEN_PSX_RSP *psx_rsp;

        cFYI(1, "In POSIX Create");
PsxCreat:
        rc = smb_init(SMB_COM_TRANSACTION2, 15, tcon, (void **) &pSMB,
                      (void **) &pSMBr);
        if (rc)
                return rc;

        if (pSMB->hdr.Flags2 & SMBFLG2_UNICODE) {
                name_len =
                    cifsConvertToUCS((__le16 *) pSMB->FileName, name,
                                     PATH_MAX, nls_codepage, remap);
                name_len++;     /* trailing null */
                name_len *= 2;
        } else {        /* BB improve the check for buffer overruns BB */
                name_len = strnlen(name, PATH_MAX);
                name_len++;     /* trailing null */
                strncpy(pSMB->FileName, name, name_len);
        }

        params = 6 + name_len;
        count = sizeof(OPEN_PSX_REQ);
        pSMB->MaxParameterCount = cpu_to_le16(2);
        pSMB->MaxDataCount = cpu_to_le16(1000); /* large enough */
        pSMB->MaxSetupCount = 0;
        pSMB->Reserved = 0;
        pSMB->Flags = 0;
        pSMB->Timeout = 0;
        pSMB->Reserved2 = 0;
        param_offset = offsetof(struct smb_com_transaction2_spi_req,
                                InformationLevel) - 4;
        offset = param_offset + params;
        pdata = (OPEN_PSX_REQ *)(((char *)&pSMB->hdr.Protocol) + offset);
        pdata->Level = cpu_to_le16(SMB_QUERY_FILE_UNIX_BASIC);
        pdata->Permissions = cpu_to_le64(mode);
        pdata->PosixOpenFlags = cpu_to_le32(posix_flags);
        pdata->OpenFlags =  cpu_to_le32(*pOplock);
        pSMB->ParameterOffset = cpu_to_le16(param_offset);
        pSMB->DataOffset = cpu_to_le16(offset);
        pSMB->SetupCount = 1;
        pSMB->Reserved3 = 0;
        pSMB->SubCommand = cpu_to_le16(TRANS2_SET_PATH_INFORMATION);
        byte_count = 3 /* pad */  + params + count;

        pSMB->DataCount = cpu_to_le16(count);
        pSMB->ParameterCount = cpu_to_le16(params);
        pSMB->TotalDataCount = pSMB->DataCount;
        pSMB->TotalParameterCount = pSMB->ParameterCount;
        pSMB->InformationLevel = cpu_to_le16(SMB_POSIX_OPEN);
        pSMB->Reserved4 = 0;
        pSMB->hdr.smb_buf_length += byte_count;
        pSMB->ByteCount = cpu_to_le16(byte_count);
        rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
                         (struct smb_hdr *) pSMBr, &bytes_returned, 0);
        if (rc) {
                cFYI(1, "Posix create returned %d", rc);
                goto psx_create_err;
        }

        cFYI(1, "copying inode info");
        rc = validate_t2((struct smb_t2_rsp *)pSMBr);

        if (rc || (pSMBr->ByteCount < sizeof(OPEN_PSX_RSP))) {
                rc = -EIO;      /* bad smb */
                goto psx_create_err;
        }

        /* copy return information to pRetData */
        psx_rsp = (OPEN_PSX_RSP *)((char *) &pSMBr->hdr.Protocol
                        + le16_to_cpu(pSMBr->t2.DataOffset));

        *pOplock = le16_to_cpu(psx_rsp->OplockFlags);
        if (netfid)
                *netfid = psx_rsp->Fid;   /* cifs fid stays in le */
        /* Let caller know file was created so we can set the mode. */
        /* Do we care about the CreateAction in any other cases? */
        if (cpu_to_le32(FILE_CREATE) == psx_rsp->CreateAction)
                *pOplock |= CIFS_CREATE_ACTION;
        /* check to make sure response data is there */
        if (psx_rsp->ReturnedLevel != cpu_to_le16(SMB_QUERY_FILE_UNIX_BASIC)) {
                pRetData->Type = cpu_to_le32(-1); /* unknown */
                cFYI(DBG2, "unknown type");
        } else {
                if (pSMBr->ByteCount < sizeof(OPEN_PSX_RSP)
                                        + sizeof(FILE_UNIX_BASIC_INFO)) {
                        cERROR(1, "Open response data too small");
                        pRetData->Type = cpu_to_le32(-1);
                        goto psx_create_err;
                }
                memcpy((char *) pRetData,
                        (char *)psx_rsp + sizeof(OPEN_PSX_RSP),
                        sizeof(FILE_UNIX_BASIC_INFO));
        }

psx_create_err:
        cifs_buf_release(pSMB);

        if (posix_flags & SMB_O_DIRECTORY)
                cifs_stats_inc(&tcon->num_posixmkdirs);
        else
                cifs_stats_inc(&tcon->num_posixopens);

        if (rc == -EAGAIN)
                goto PsxCreat;

        return rc;
}

static __u16 convert_disposition(int disposition)
{
        __u16 ofun = 0;

        switch (disposition) {
                case FILE_SUPERSEDE:
                        ofun = SMBOPEN_OCREATE | SMBOPEN_OTRUNC;
                        break;
                case FILE_OPEN:
                        ofun = SMBOPEN_OAPPEND;
                        break;
                case FILE_CREATE:
                        ofun = SMBOPEN_OCREATE;
                        break;
                case FILE_OPEN_IF:
                        ofun = SMBOPEN_OCREATE | SMBOPEN_OAPPEND;
                        break;
                case FILE_OVERWRITE:
                        ofun = SMBOPEN_OTRUNC;
                        break;
                case FILE_OVERWRITE_IF:
                        ofun = SMBOPEN_OCREATE | SMBOPEN_OTRUNC;
                        break;
                default:
                        cFYI(1, "unknown disposition %d", disposition);
                        ofun =  SMBOPEN_OAPPEND; /* regular open */
        }
        return ofun;
}

static int
access_flags_to_smbopen_mode(const int access_flags)
{
        int masked_flags = access_flags & (GENERIC_READ | GENERIC_WRITE);

        if (masked_flags == GENERIC_READ)
                return SMBOPEN_READ;
        else if (masked_flags == GENERIC_WRITE)
                return SMBOPEN_WRITE;

        /* just go for read/write */
        return SMBOPEN_READWRITE;
}

int
SMBLegacyOpen(const int xid, struct cifsTconInfo *tcon,
            const char *fileName, const int openDisposition,
            const int access_flags, const int create_options, __u16 *netfid,
            int *pOplock, FILE_ALL_INFO *pfile_info,
            const struct nls_table *nls_codepage, int remap)
{
        int rc = -EACCES;
        OPENX_REQ *pSMB = NULL;
        OPENX_RSP *pSMBr = NULL;
        int bytes_returned;
        int name_len;
        __u16 count;

OldOpenRetry:
        rc = smb_init(SMB_COM_OPEN_ANDX, 15, tcon, (void **) &pSMB,
                      (void **) &pSMBr);
        if (rc)
                return rc;

        pSMB->AndXCommand = 0xFF;       /* none */

        if (pSMB->hdr.Flags2 & SMBFLG2_UNICODE) {
                count = 1;      /* account for one byte pad to word boundary */
                name_len =
                   cifsConvertToUCS((__le16 *) (pSMB->fileName + 1),
                                    fileName, PATH_MAX, nls_codepage, remap);
                name_len++;     /* trailing null */
                name_len *= 2;
        } else {                /* BB improve check for buffer overruns BB */
                count = 0;      /* no pad */
                name_len = strnlen(fileName, PATH_MAX);
                name_len++;     /* trailing null */
                strncpy(pSMB->fileName, fileName, name_len);
        }
        if (*pOplock & REQ_OPLOCK)
                pSMB->OpenFlags = cpu_to_le16(REQ_OPLOCK);
        else if (*pOplock & REQ_BATCHOPLOCK)
                pSMB->OpenFlags = cpu_to_le16(REQ_BATCHOPLOCK);

        pSMB->OpenFlags |= cpu_to_le16(REQ_MORE_INFO);
        pSMB->Mode = cpu_to_le16(access_flags_to_smbopen_mode(access_flags));
        pSMB->Mode |= cpu_to_le16(0x40); /* deny none */
        /* set file as system file if special file such
           as fifo and server expecting SFU style and
           no Unix extensions */

        if (create_options & CREATE_OPTION_SPECIAL)
                pSMB->FileAttributes = cpu_to_le16(ATTR_SYSTEM);
        else /* BB FIXME BB */
                pSMB->FileAttributes = cpu_to_le16(0/*ATTR_NORMAL*/);

        if (create_options & CREATE_OPTION_READONLY)
                pSMB->FileAttributes |= cpu_to_le16(ATTR_READONLY);

        /* BB FIXME BB */
/*      pSMB->CreateOptions = cpu_to_le32(create_options &
                                                 CREATE_OPTIONS_MASK); */
        /* BB FIXME END BB */

        pSMB->Sattr = cpu_to_le16(ATTR_HIDDEN | ATTR_SYSTEM | ATTR_DIRECTORY);
        pSMB->OpenFunction = cpu_to_le16(convert_disposition(openDisposition));
        count += name_len;
        pSMB->hdr.smb_buf_length += count;

        pSMB->ByteCount = cpu_to_le16(count);
        /* long_op set to 1 to allow for oplock break timeouts */
        rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
                        (struct smb_hdr *)pSMBr, &bytes_returned, 0);
        cifs_stats_inc(&tcon->num_opens);
        if (rc) {
                cFYI(1, "Error in Open = %d", rc);
        } else {
        /* BB verify if wct == 15 */

/*              *pOplock = pSMBr->OplockLevel; */ /* BB take from action field*/

                *netfid = pSMBr->Fid;   /* cifs fid stays in le */
                /* Let caller know file was created so we can set the mode. */
                /* Do we care about the CreateAction in any other cases? */
        /* BB FIXME BB */
/*              if (cpu_to_le32(FILE_CREATE) == pSMBr->CreateAction)
                        *pOplock |= CIFS_CREATE_ACTION; */
        /* BB FIXME END */

                if (pfile_info) {
                        pfile_info->CreationTime = 0; /* BB convert CreateTime*/
                        pfile_info->LastAccessTime = 0; /* BB fixme */
                        pfile_info->LastWriteTime = 0; /* BB fixme */
                        pfile_info->ChangeTime = 0;  /* BB fixme */
                        pfile_info->Attributes =
                                cpu_to_le32(le16_to_cpu(pSMBr->FileAttributes));
                        /* the file_info buf is endian converted by caller */
                        pfile_info->AllocationSize =
                                cpu_to_le64(le32_to_cpu(pSMBr->EndOfFile));
                        pfile_info->EndOfFile = pfile_info->AllocationSize;
                        pfile_info->NumberOfLinks = cpu_to_le32(1);
                        pfile_info->DeletePending = 0;
                }
        }

        cifs_buf_release(pSMB);
        if (rc == -EAGAIN)
                goto OldOpenRetry;
        return rc;
}

int
CIFSSMBOpen(const int xid, struct cifsTconInfo *tcon,
            const char *fileName, const int openDisposition,
            const int access_flags, const int create_options, __u16 *netfid,
            int *pOplock, FILE_ALL_INFO *pfile_info,
            const struct nls_table *nls_codepage, int remap)
{
        int rc = -EACCES;
        OPEN_REQ *pSMB = NULL;
        OPEN_RSP *pSMBr = NULL;
        int bytes_returned;
        int name_len;
        __u16 count;

openRetry:
        rc = smb_init(SMB_COM_NT_CREATE_ANDX, 24, tcon, (void **) &pSMB,
                      (void **) &pSMBr);
        if (rc)
                return rc;

        pSMB->AndXCommand = 0xFF;       /* none */

        if (pSMB->hdr.Flags2 & SMBFLG2_UNICODE) {
                count = 1;      /* account for one byte pad to word boundary */
                name_len =
                    cifsConvertToUCS((__le16 *) (pSMB->fileName + 1),
                                     fileName, PATH_MAX, nls_codepage, remap);
                name_len++;     /* trailing null */
                name_len *= 2;
                pSMB->NameLength = cpu_to_le16(name_len);
        } else {                /* BB improve check for buffer overruns BB */
                count = 0;      /* no pad */
                name_len = strnlen(fileName, PATH_MAX);
                name_len++;     /* trailing null */
                pSMB->NameLength = cpu_to_le16(name_len);
                strncpy(pSMB->fileName, fileName, name_len);
        }
        if (*pOplock & REQ_OPLOCK)
                pSMB->OpenFlags = cpu_to_le32(REQ_OPLOCK);
        else if (*pOplock & REQ_BATCHOPLOCK)
                pSMB->OpenFlags = cpu_to_le32(REQ_BATCHOPLOCK);
        pSMB->DesiredAccess = cpu_to_le32(access_flags);
        pSMB->AllocationSize = 0;
        /* set file as system file if special file such
           as fifo and server expecting SFU style and
           no Unix extensions */
        if (create_options & CREATE_OPTION_SPECIAL)
                pSMB->FileAttributes = cpu_to_le32(ATTR_SYSTEM);
        else
                pSMB->FileAttributes = cpu_to_le32(ATTR_NORMAL);

        /* XP does not handle ATTR_POSIX_SEMANTICS */
        /* but it helps speed up case sensitive checks for other
        servers such as Samba */
        if (tcon->ses->capabilities & CAP_UNIX)
                pSMB->FileAttributes |= cpu_to_le32(ATTR_POSIX_SEMANTICS);

        if (create_options & CREATE_OPTION_READONLY)
                pSMB->FileAttributes |= cpu_to_le32(ATTR_READONLY);

        pSMB->ShareAccess = cpu_to_le32(FILE_SHARE_ALL);
        pSMB->CreateDisposition = cpu_to_le32(openDisposition);
        pSMB->CreateOptions = cpu_to_le32(create_options & CREATE_OPTIONS_MASK);
        /* BB Expirement with various impersonation levels and verify */
        pSMB->ImpersonationLevel = cpu_to_le32(SECURITY_IMPERSONATION);
        pSMB->SecurityFlags =
            SECURITY_CONTEXT_TRACKING | SECURITY_EFFECTIVE_ONLY;

        count += name_len;
        pSMB->hdr.smb_buf_length += count;

        pSMB->ByteCount = cpu_to_le16(count);
        /* long_op set to 1 to allow for oplock break timeouts */
        rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
                        (struct smb_hdr *)pSMBr, &bytes_returned, 0);
        cifs_stats_inc(&tcon->num_opens);
        if (rc) {
                cFYI(1, "Error in Open = %d", rc);
        } else {
                *pOplock = pSMBr->OplockLevel; /* 1 byte no need to le_to_cpu */
                *netfid = pSMBr->Fid;   /* cifs fid stays in le */
                /* Let caller know file was created so we can set the mode. */
                /* Do we care about the CreateAction in any other cases? */
                if (cpu_to_le32(FILE_CREATE) == pSMBr->CreateAction)
                        *pOplock |= CIFS_CREATE_ACTION;
                if (pfile_info) {
                        memcpy((char *)pfile_info, (char *)&pSMBr->CreationTime,
                                36 /* CreationTime to Attributes */);
                        /* the file_info buf is endian converted by caller */
                        pfile_info->AllocationSize = pSMBr->AllocationSize;
                        pfile_info->EndOfFile = pSMBr->EndOfFile;
                        pfile_info->NumberOfLinks = cpu_to_le32(1);
                        pfile_info->DeletePending = 0;
                }
        }

        cifs_buf_release(pSMB);
        if (rc == -EAGAIN)
                goto openRetry;
        return rc;
}

int
CIFSSMBRead(const int xid, struct cifsTconInfo *tcon, const int netfid,
            const unsigned int count, const __u64 lseek, unsigned int *nbytes,
            char **buf, int *pbuf_type)
{
        int rc = -EACCES;
        READ_REQ *pSMB = NULL;
        READ_RSP *pSMBr = NULL;
        char *pReadData = NULL;
        int wct;
        int resp_buf_type = 0;
        struct kvec iov[1];

        cFYI(1, "Reading %d bytes on fid %d", count, netfid);
        if (tcon->ses->capabilities & CAP_LARGE_FILES)
                wct = 12;
        else {
                wct = 10; /* old style read */
                if ((lseek >> 32) > 0)  {
                        /* can not handle this big offset for old */
                        return -EIO;
                }
        }

        *nbytes = 0;
        rc = small_smb_init(SMB_COM_READ_ANDX, wct, tcon, (void **) &pSMB);
        if (rc)
                return rc;

        /* tcon and ses pointer are checked in smb_init */
        if (tcon->ses->server == NULL)
                return -ECONNABORTED;

        pSMB->AndXCommand = 0xFF;       /* none */
        pSMB->Fid = netfid;
        pSMB->OffsetLow = cpu_to_le32(lseek & 0xFFFFFFFF);
        if (wct == 12)
                pSMB->OffsetHigh = cpu_to_le32(lseek >> 32);

        pSMB->Remaining = 0;
        pSMB->MaxCount = cpu_to_le16(count & 0xFFFF);
        pSMB->MaxCountHigh = cpu_to_le32(count >> 16);
        if (wct == 12)
                pSMB->ByteCount = 0;  /* no need to do le conversion since 0 */
        else {
                /* old style read */
                struct smb_com_readx_req *pSMBW =
                        (struct smb_com_readx_req *)pSMB;
                pSMBW->ByteCount = 0;
        }

        iov[0].iov_base = (char *)pSMB;
        iov[0].iov_len = pSMB->hdr.smb_buf_length + 4;
        rc = SendReceive2(xid, tcon->ses, iov, 1 /* num iovecs */,
                         &resp_buf_type, CIFS_LOG_ERROR);
        cifs_stats_inc(&tcon->num_reads);
        pSMBr = (READ_RSP *)iov[0].iov_base;
        if (rc) {
                cERROR(1, "Send error in read = %d", rc);
        } else {
                int data_length = le16_to_cpu(pSMBr->DataLengthHigh);
                data_length = data_length << 16;
                data_length += le16_to_cpu(pSMBr->DataLength);
                *nbytes = data_length;

                /*check that DataLength would not go beyond end of SMB */
                if ((data_length > CIFSMaxBufSize)
                                || (data_length > count)) {
                        cFYI(1, "bad length %d for count %d",
                                 data_length, count);
                        rc = -EIO;
                        *nbytes = 0;
                } else {
                        pReadData = (char *) (&pSMBr->hdr.Protocol) +
                                        le16_to_cpu(pSMBr->DataOffset);
/*                      if (rc = copy_to_user(buf, pReadData, data_length)) {
                                cERROR(1, "Faulting on read rc = %d",rc);
                                rc = -EFAULT;
                        }*/ /* can not use copy_to_user when using page cache*/
                        if (*buf)
                                memcpy(*buf, pReadData, data_length);
                }
        }

/*      cifs_small_buf_release(pSMB); */ /* Freed earlier now in SendReceive2 */
        if (*buf) {
                if (resp_buf_type == CIFS_SMALL_BUFFER)
                        cifs_small_buf_release(iov[0].iov_base);
                else if (resp_buf_type == CIFS_LARGE_BUFFER)
                        cifs_buf_release(iov[0].iov_base);
        } else if (resp_buf_type != CIFS_NO_BUFFER) {
                /* return buffer to caller to free */
                *buf = iov[0].iov_base;
                if (resp_buf_type == CIFS_SMALL_BUFFER)
                        *pbuf_type = CIFS_SMALL_BUFFER;
                else if (resp_buf_type == CIFS_LARGE_BUFFER)
                        *pbuf_type = CIFS_LARGE_BUFFER;
        } /* else no valid buffer on return - leave as null */

        /* Note: On -EAGAIN error only caller can retry on handle based calls
                since file handle passed in no longer valid */
        return rc;
}


int
CIFSSMBWrite(const int xid, struct cifsTconInfo *tcon,
             const int netfid, const unsigned int count,
             const __u64 offset, unsigned int *nbytes, const char *buf,
             const char __user *ubuf, const int long_op)
{
        int rc = -EACCES;
        WRITE_REQ *pSMB = NULL;
        WRITE_RSP *pSMBr = NULL;
        int bytes_returned, wct;
        __u32 bytes_sent;
        __u16 byte_count;

        *nbytes = 0;

        /* cFYI(1, "write at %lld %d bytes", offset, count);*/
        if (tcon->ses == NULL)
                return -ECONNABORTED;

        if (tcon->ses->capabilities & CAP_LARGE_FILES)
                wct = 14;
        else {
                wct = 12;
                if ((offset >> 32) > 0) {
                        /* can not handle big offset for old srv */
                        return -EIO;
                }
        }

        rc = smb_init(SMB_COM_WRITE_ANDX, wct, tcon, (void **) &pSMB,
                      (void **) &pSMBr);
        if (rc)
                return rc;
        /* tcon and ses pointer are checked in smb_init */
        if (tcon->ses->server == NULL)
                return -ECONNABORTED;

        pSMB->AndXCommand = 0xFF;       /* none */
        pSMB->Fid = netfid;
        pSMB->OffsetLow = cpu_to_le32(offset & 0xFFFFFFFF);
        if (wct == 14)
                pSMB->OffsetHigh = cpu_to_le32(offset >> 32);

        pSMB->Reserved = 0xFFFFFFFF;
        pSMB->WriteMode = 0;
        pSMB->Remaining = 0;

        /* Can increase buffer size if buffer is big enough in some cases ie we
        can send more if LARGE_WRITE_X capability returned by the server and if
        our buffer is big enough or if we convert to iovecs on socket writes
        and eliminate the copy to the CIFS buffer */
        if (tcon->ses->capabilities & CAP_LARGE_WRITE_X) {
                bytes_sent = min_t(const unsigned int, CIFSMaxBufSize, count);
        } else {
                bytes_sent = (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE)
                         & ~0xFF;
        }

        if (bytes_sent > count)
                bytes_sent = count;
        pSMB->DataOffset =
                cpu_to_le16(offsetof(struct smb_com_write_req, Data) - 4);
        if (buf)
                memcpy(pSMB->Data, buf, bytes_sent);
        else if (ubuf) {
                if (copy_from_user(pSMB->Data, ubuf, bytes_sent)) {
                        cifs_buf_release(pSMB);
                        return -EFAULT;
                }
        } else if (count != 0) {
                /* No buffer */
                cifs_buf_release(pSMB);
                return -EINVAL;
        } /* else setting file size with write of zero bytes */
        if (wct == 14)
                byte_count = bytes_sent + 1; /* pad */
        else /* wct == 12 */
                byte_count = bytes_sent + 5; /* bigger pad, smaller smb hdr */

        pSMB->DataLengthLow = cpu_to_le16(bytes_sent & 0xFFFF);
        pSMB->DataLengthHigh = cpu_to_le16(bytes_sent >> 16);
        pSMB->hdr.smb_buf_length += byte_count;

        if (wct == 14)
                pSMB->ByteCount = cpu_to_le16(byte_count);
        else { /* old style write has byte count 4 bytes earlier
                  so 4 bytes pad  */
                struct smb_com_writex_req *pSMBW =
                        (struct smb_com_writex_req *)pSMB;
                pSMBW->ByteCount = cpu_to_le16(byte_count);
        }

        rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
                         (struct smb_hdr *) pSMBr, &bytes_returned, long_op);
        cifs_stats_inc(&tcon->num_writes);
        if (rc) {
                cFYI(1, "Send error in write = %d", rc);
        } else {
                *nbytes = le16_to_cpu(pSMBr->CountHigh);
                *nbytes = (*nbytes) << 16;
                *nbytes += le16_to_cpu(pSMBr->Count);

                /*
                 * Mask off high 16 bits when bytes written as returned by the
                 * server is greater than bytes requested by the client. Some
                 * OS/2 servers are known to set incorrect CountHigh values.
                 */
                if (*nbytes > count)
                        *nbytes &= 0xFFFF;
        }

        cifs_buf_release(pSMB);

        /* Note: On -EAGAIN error only caller can retry on handle based calls
                since file handle passed in no longer valid */

        return rc;
}

int
CIFSSMBWrite2(const int xid, struct cifsTconInfo *tcon,
             const int netfid, const unsigned int count,
             const __u64 offset, unsigned int *nbytes, struct kvec *iov,
             int n_vec, const int long_op)
{
        int rc = -EACCES;
        WRITE_REQ *pSMB = NULL;
        int wct;
        int smb_hdr_len;
        int resp_buf_type = 0;

        *nbytes = 0;

        cFYI(1, "write2 at %lld %d bytes", (long long)offset, count);

        if (tcon->ses->capabilities & CAP_LARGE_FILES) {
                wct = 14;
        } else {
                wct = 12;
                if ((offset >> 32) > 0) {
                        /* can not handle big offset for old srv */
                        return -EIO;
                }
        }
        rc = small_smb_init(SMB_COM_WRITE_ANDX, wct, tcon, (void **) &pSMB);
        if (rc)
                return rc;
        /* tcon and ses pointer are checked in smb_init */
        if (tcon->ses->server == NULL)
                return -ECONNABORTED;

        pSMB->AndXCommand = 0xFF;       /* none */
        pSMB->Fid = netfid;
        pSMB->OffsetLow = cpu_to_le32(offset & 0xFFFFFFFF);
        if (wct == 14)
                pSMB->OffsetHigh = cpu_to_le32(offset >> 32);
        pSMB->Reserved = 0xFFFFFFFF;
        pSMB->WriteMode = 0;
        pSMB->Remaining = 0;

        pSMB->DataOffset =
            cpu_to_le16(offsetof(struct smb_com_write_req, Data) - 4);

        pSMB->DataLengthLow = cpu_to_le16(count & 0xFFFF);
        pSMB->DataLengthHigh = cpu_to_le16(count >> 16);
        smb_hdr_len = pSMB->hdr.smb_buf_length + 1; /* hdr + 1 byte pad */
        if (wct == 14)
                pSMB->hdr.smb_buf_length += count+1;
        else /* wct == 12 */
                pSMB->hdr.smb_buf_length += count+5; /* smb data starts later */
        if (wct == 14)
                pSMB->ByteCount = cpu_to_le16(count + 1);
        else /* wct == 12 */ /* bigger pad, smaller smb hdr, keep offset ok */ {
                struct smb_com_writex_req *pSMBW =
                                (struct smb_com_writex_req *)pSMB;
                pSMBW->ByteCount = cpu_to_le16(count + 5);
        }
        iov[0].iov_base = pSMB;
        if (wct == 14)
                iov[0].iov_len = smb_hdr_len + 4;
        else /* wct == 12 pad bigger by four bytes */
                iov[0].iov_len = smb_hdr_len + 8;


        rc = SendReceive2(xid, tcon->ses, iov, n_vec + 1, &resp_buf_type,
                          long_op);
        cifs_stats_inc(&tcon->num_writes);
        if (rc) {
                cFYI(1, "Send error Write2 = %d", rc);
        } else if (resp_buf_type == 0) {
                /* presumably this can not happen, but best to be safe */
                rc = -EIO;
        } else {
                WRITE_RSP *pSMBr = (WRITE_RSP *)iov[0].iov_base;
                *nbytes = le16_to_cpu(pSMBr->CountHigh);
                *nbytes = (*nbytes) << 16;
                *nbytes += le16_to_cpu(pSMBr->Count);

                /*
                 * 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 (*nbytes > count)
                        *nbytes &= 0xFFFF;
        }

/*      cifs_small_buf_release(pSMB); */ /* Freed earlier now in SendReceive2 */
        if (resp_buf_type == CIFS_SMALL_BUFFER)
                cifs_small_buf_release(iov[0].iov_base);
        else if (resp_buf_type == CIFS_LARGE_BUFFER)
                cifs_buf_release(iov[0].iov_base);

        /* Note: On -EAGAIN error only caller can retry on handle based calls
                since file handle passed in no longer valid */

        return rc;
}


int
CIFSSMBLock(const int xid, struct cifsTconInfo *tcon,
            const __u16 smb_file_id, const __u64 len,
            const __u64 offset, const __u32 numUnlock,
            const __u32 numLock, const __u8 lockType,
            const bool waitFlag, const __u8 oplock_level)
{
        int rc = 0;
        LOCK_REQ *pSMB = NULL;
/*      LOCK_RSP *pSMBr = NULL; */ /* No response data other than rc to parse */
        int bytes_returned;
        int timeout = 0;
        __u16 count;

        cFYI(1, "CIFSSMBLock timeout %d numLock %d", (int)waitFlag, numLock);
        rc = small_smb_init(SMB_COM_LOCKING_ANDX, 8, tcon, (void **) &pSMB);

        if (rc)
                return rc;

        if (lockType == LOCKING_ANDX_OPLOCK_RELEASE) {
                timeout = CIFS_ASYNC_OP; /* no response expected */
                pSMB->Timeout = 0;
        } else if (waitFlag) {
                timeout = CIFS_BLOCKING_OP; /* blocking operation, no timeout */
                pSMB->Timeout = cpu_to_le32(-1);/* blocking - do not time out */
        } else {
                pSMB->Timeout = 0;
        }

        pSMB->NumberOfLocks = cpu_to_le16(numLock);
        pSMB->NumberOfUnlocks = cpu_to_le16(numUnlock);
        pSMB->LockType = lockType;
        pSMB->OplockLevel = oplock_level;
        pSMB->AndXCommand = 0xFF;       /* none */
        pSMB->Fid = smb_file_id; /* netfid stays le */

        if ((numLock != 0) || (numUnlock != 0)) {
                pSMB->Locks[0].Pid = cpu_to_le16(current->tgid);
                /* BB where to store pid high? */
                pSMB->Locks[0].LengthLow = cpu_to_le32((u32)len);
                pSMB->Locks[0].LengthHigh = cpu_to_le32((u32)(len>>32));
                pSMB->Locks[0].OffsetLow = cpu_to_le32((u32)offset);
                pSMB->Locks[0].OffsetHigh = cpu_to_le32((u32)(offset>>32));
                count = sizeof(LOCKING_ANDX_RANGE);
        } else {
                /* oplock break */
                count = 0;
        }
        pSMB->hdr.smb_buf_length += count;
        pSMB->ByteCount = cpu_to_le16(count);

        if (waitFlag) {
                rc = SendReceiveBlockingLock(xid, tcon, (struct smb_hdr *) pSMB,
                        (struct smb_hdr *) pSMB, &bytes_returned);
                cifs_small_buf_release(pSMB);
        } else {
                rc = SendReceiveNoRsp(xid, tcon->ses, (struct smb_hdr *)pSMB,
                                      timeout);
                /* SMB buffer freed by function above */
        }
        cifs_stats_inc(&tcon->num_locks);
        if (rc)
                cFYI(1, "Send error in Lock = %d", rc);

        /* Note: On -EAGAIN error only caller can retry on handle based calls
        since file handle passed in no longer valid */
        return rc;
}

int
CIFSSMBPosixLock(const int xid, struct cifsTconInfo *tcon,
                const __u16 smb_file_id, const int get_flag, const __u64 len,
                struct file_lock *pLockData, const __u16 lock_type,
                const bool waitFlag)
{
        struct smb_com_transaction2_sfi_req *pSMB  = NULL;
        struct smb_com_transaction2_sfi_rsp *pSMBr = NULL;
        struct cifs_posix_lock *parm_data;
        int rc = 0;
        int timeout = 0;
        int bytes_returned = 0;
        int resp_buf_type = 0;
        __u16 params, param_offset, offset, byte_count, count;
        struct kvec iov[1];

        cFYI(1, "Posix Lock");

        if (pLockData == NULL)
                return -EINVAL;

        rc = small_smb_init(SMB_COM_TRANSACTION2, 15, tcon, (void **) &pSMB);

        if (rc)
                return rc;

        pSMBr = (struct smb_com_transaction2_sfi_rsp *)pSMB;

        params = 6;
        pSMB->MaxSetupCount = 0;
        pSMB->Reserved = 0;
        pSMB->Flags = 0;
        pSMB->Reserved2 = 0;
        param_offset = offsetof(struct smb_com_transaction2_sfi_req, Fid) - 4;
        offset = param_offset + params;

        count = sizeof(struct cifs_posix_lock);
        pSMB->MaxParameterCount = cpu_to_le16(2);
        pSMB->MaxDataCount = cpu_to_le16(1000); /* BB find max SMB from sess */
        pSMB->SetupCount = 1;
        pSMB->Reserved3 = 0;
        if (get_flag)
                pSMB->SubCommand = cpu_to_le16(TRANS2_QUERY_FILE_INFORMATION);
        else
                pSMB->SubCommand = cpu_to_le16(TRANS2_SET_FILE_INFORMATION);
        byte_count = 3 /* pad */  + params + count;
        pSMB->DataCount = cpu_to_le16(count);
        pSMB->ParameterCount = cpu_to_le16(params);
        pSMB->TotalDataCount = pSMB->DataCount;
        pSMB->TotalParameterCount = pSMB->ParameterCount;
        pSMB->ParameterOffset = cpu_to_le16(param_offset);
        parm_data = (struct cifs_posix_lock *)
                        (((char *) &pSMB->hdr.Protocol) + offset);

        parm_data->lock_type = cpu_to_le16(lock_type);
        if (waitFlag) {
                timeout = CIFS_BLOCKING_OP; /* blocking operation, no timeout */
                parm_data->lock_flags = cpu_to_le16(1);
                pSMB->Timeout = cpu_to_le32(-1);
        } else
                pSMB->Timeout = 0;

        parm_data->pid = cpu_to_le32(current->tgid);
        parm_data->start = cpu_to_le64(pLockData->fl_start);
        parm_data->length = cpu_to_le64(len);  /* normalize negative numbers */

        pSMB->DataOffset = cpu_to_le16(offset);
        pSMB->Fid = smb_file_id;
        pSMB->InformationLevel = cpu_to_le16(SMB_SET_POSIX_LOCK);
        pSMB->Reserved4 = 0;
        pSMB->hdr.smb_buf_length += byte_count;
        pSMB->ByteCount = cpu_to_le16(byte_count);
        if (waitFlag) {
                rc = SendReceiveBlockingLock(xid, tcon, (struct smb_hdr *) pSMB,
                        (struct smb_hdr *) pSMBr, &bytes_returned);
        } else {
                iov[0].iov_base = (char *)pSMB;
                iov[0].iov_len = pSMB->hdr.smb_buf_length + 4;
                rc = SendReceive2(xid, tcon->ses, iov, 1 /* num iovecs */,
                                &resp_buf_type, timeout);
                pSMB = NULL; /* request buf already freed by SendReceive2. Do
                                not try to free it twice below on exit */
                pSMBr = (struct smb_com_transaction2_sfi_rsp *)iov[0].iov_base;
        }

        if (rc) {
                cFYI(1, "Send error in Posix Lock = %d", rc);
        } else if (get_flag) {
                /* lock structure can be returned on get */
                __u16 data_offset;
                __u16 data_count;
                rc = validate_t2((struct smb_t2_rsp *)pSMBr);

                if (rc || (pSMBr->ByteCount < sizeof(struct cifs_posix_lock))) {
                        rc = -EIO;      /* bad smb */
                        goto plk_err_exit;
                }
                data_offset = le16_to_cpu(pSMBr->t2.DataOffset);
                data_count  = le16_to_cpu(pSMBr->t2.DataCount);
                if (data_count < sizeof(struct cifs_posix_lock)) {
                        rc = -EIO;
                        goto plk_err_exit;
                }
                parm_data = (struct cifs_posix_lock *)
                        ((char *)&pSMBr->hdr.Protocol + data_offset);
                if (parm_data->lock_type == __constant_cpu_to_le16(CIFS_UNLCK))
                        pLockData->fl_type = F_UNLCK;
                else {
                        if (parm_data->lock_type ==
                                        __constant_cpu_to_le16(CIFS_RDLCK))
                                pLockData->fl_type = F_RDLCK;
                        else if (parm_data->lock_type ==
                                        __constant_cpu_to_le16(CIFS_WRLCK))
                                pLockData->fl_type = F_WRLCK;

                        pLockData->fl_start = parm_data->start;
                        pLockData->fl_end = parm_data->start +
                                                parm_data->length - 1;
                        pLockData->fl_pid = parm_data->pid;
                }
        }

plk_err_exit:
        if (pSMB)
                cifs_small_buf_release(pSMB);

        if (resp_buf_type == CIFS_SMALL_BUFFER)
                cifs_small_buf_release(iov[0].iov_base);
        else if (resp_buf_type == CIFS_LARGE_BUFFER)
                cifs_buf_release(iov[0].iov_base);

        /* Note: On -EAGAIN error only caller can retry on handle based calls
           since file handle passed in no longer valid */

        return rc;
}


int
CIFSSMBClose(const int xid, struct cifsTconInfo *tcon, int smb_file_id)
{
        int rc = 0;
        CLOSE_REQ *pSMB = NULL;
        cFYI(1, "In CIFSSMBClose");

/* do not retry on dead session on close */
        rc = small_smb_init(SMB_COM_CLOSE, 3, tcon, (void **) &pSMB);
        if (rc == -EAGAIN)
                return 0;
        if (rc)
                return rc;

        pSMB->FileID = (__u16) smb_file_id;
        pSMB->LastWriteTime = 0xFFFFFFFF;
        pSMB->ByteCount = 0;
        rc = SendReceiveNoRsp(xid, tcon->ses, (struct smb_hdr *) pSMB, 0);
        cifs_stats_inc(&tcon->num_closes);
        if (rc) {
                if (rc != -EINTR) {
                        /* EINTR is expected when user ctl-c to kill app */
                        cERROR(1, "Send error in Close = %d", rc);
                }
        }

        /* Since session is dead, file will be closed on server already */
        if (rc == -EAGAIN)
                rc = 0;

        return rc;
}

int
CIFSSMBFlush(const int xid, struct cifsTconInfo *tcon, int smb_file_id)
{
        int rc = 0;
        FLUSH_REQ *pSMB = NULL;
        cFYI(1, "In CIFSSMBFlush");

        rc = small_smb_init(SMB_COM_FLUSH, 1, tcon, (void **) &pSMB);
        if (rc)
                return rc;

        pSMB->FileID = (__u16) smb_file_id;
        pSMB->ByteCount = 0;
        rc = SendReceiveNoRsp(xid, tcon->ses, (struct smb_hdr *) pSMB, 0);
        cifs_stats_inc(&tcon->num_flushes);
        if (rc)
                cERROR(1, "Send error in Flush = %d", rc);

        return rc;
}

int
CIFSSMBRename(const int xid, struct cifsTconInfo *tcon,
              const char *fromName, const char *toName,
              const struct nls_table *nls_codepage, int remap)
{
        int rc = 0;
        RENAME_REQ *pSMB = NULL;
        RENAME_RSP *pSMBr = NULL;
        int bytes_returned;
        int name_len, name_len2;
        __u16 count;

        cFYI(1, "In CIFSSMBRename");
renameRetry:
        rc = smb_init(SMB_COM_RENAME, 1, tcon, (void **) &pSMB,
                      (void **) &pSMBr);
        if (rc)
                return rc;

        pSMB->BufferFormat = 0x04;
        pSMB->SearchAttributes =
            cpu_to_le16(ATTR_READONLY | ATTR_HIDDEN | ATTR_SYSTEM |
                        ATTR_DIRECTORY);

        if (pSMB->hdr.Flags2 & SMBFLG2_UNICODE) {
                name_len =
                    cifsConvertToUCS((__le16 *) pSMB->OldFileName, fromName,
                                     PATH_MAX, nls_codepage, remap);
                name_len++;     /* trailing null */
                name_len *= 2;
                pSMB->OldFileName[name_len] = 0x04;     /* pad */
        /* protocol requires ASCII signature byte on Unicode string */
                pSMB->OldFileName[name_len + 1] = 0x00;
                name_len2 =
                    cifsConvertToUCS((__le16 *)&pSMB->OldFileName[name_len + 2],
                                     toName, PATH_MAX, nls_codepage, remap);
                name_len2 += 1 /* trailing null */  + 1 /* Signature word */ ;

                name_len2 *= 2; /* convert to bytes */
        } else {        /* BB improve the check for buffer overruns BB */
                name_len = strnlen(fromName, PATH_MAX);
                name_len++;     /* trailing null */
                strncpy(pSMB->OldFileName, fromName, name_len);
                name_len2 = strnlen(toName, PATH_MAX);
                name_len2++;    /* trailing null */
                pSMB->OldFileName[name_len] = 0x04;  /* 2nd buffer format */
                strncpy(&pSMB->OldFileName[name_len + 1], toName, name_len2);
                name_len2++;    /* trailing null */
                name_len2++;    /* signature byte */
        }

        count = 1 /* 1st signature byte */  + name_len + name_len2;
        pSMB->hdr.smb_buf_length += count;
        pSMB->ByteCount = cpu_to_le16(count);

        rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
                         (struct smb_hdr *) pSMBr, &bytes_returned, 0);
        cifs_stats_inc(&tcon->num_renames);
        if (rc)
                cFYI(1, "Send error in rename = %d", rc);

        cifs_buf_release(pSMB);

        if (rc == -EAGAIN)
                goto renameRetry;

        return rc;
}

int CIFSSMBRenameOpenFile(const int xid, struct cifsTconInfo *pTcon,
                int netfid, const char *target_name,
                const struct nls_table *nls_codepage, int remap)
{
        struct smb_com_transaction2_sfi_req *pSMB  = NULL;
        struct smb_com_transaction2_sfi_rsp *pSMBr = NULL;
        struct set_file_rename *rename_info;
        char *data_offset;
        char dummy_string[30];
        int rc = 0;
        int bytes_returned = 0;
        int len_of_str;
        __u16 params, param_offset, offset, count, byte_count;

        cFYI(1, "Rename to File by handle");
        rc = smb_init(SMB_COM_TRANSACTION2, 15, pTcon, (void **) &pSMB,
                        (void **) &pSMBr);
        if (rc)
                return rc;

        params = 6;
        pSMB->MaxSetupCount = 0;
        pSMB->Reserved = 0;
        pSMB->Flags = 0;
        pSMB->Timeout = 0;
        pSMB->Reserved2 = 0;
        param_offset = offsetof(struct smb_com_transaction2_sfi_req, Fid) - 4;
        offset = param_offset + params;

        data_offset = (char *) (&pSMB->hdr.Protocol) + offset;
        rename_info = (struct set_file_rename *) data_offset;
        pSMB->MaxParameterCount = cpu_to_le16(2);
        pSMB->MaxDataCount = cpu_to_le16(1000); /* BB find max SMB from sess */
        pSMB->SetupCount = 1;
        pSMB->Reserved3 = 0;
        pSMB->SubCommand = cpu_to_le16(TRANS2_SET_FILE_INFORMATION);
        byte_count = 3 /* pad */  + params;
        pSMB->ParameterCount = cpu_to_le16(params);
        pSMB->TotalParameterCount = pSMB->ParameterCount;
        pSMB->ParameterOffset = cpu_to_le16(param_offset);
        pSMB->DataOffset = cpu_to_le16(offset);
        /* construct random name ".cifs_tmp<inodenum><mid>" */
        rename_info->overwrite = cpu_to_le32(1);
        rename_info->root_fid  = 0;
        /* unicode only call */
        if (target_name == NULL) {
                sprintf(dummy_string, "cifs%x", pSMB->hdr.Mid);
                len_of_str = cifsConvertToUCS((__le16 *)rename_info->target_name,
                                        dummy_string, 24, nls_codepage, remap);
        } else {
                len_of_str = cifsConvertToUCS((__le16 *)rename_info->target_name,
                                        target_name, PATH_MAX, nls_codepage,
                                        remap);
        }
        rename_info->target_name_len = cpu_to_le32(2 * len_of_str);
        count = 12 /* sizeof(struct set_file_rename) */ + (2 * len_of_str);
        byte_count += count;
        pSMB->DataCount = cpu_to_le16(count);
        pSMB->TotalDataCount = pSMB->DataCount;
        pSMB->Fid = netfid;
        pSMB->InformationLevel =
                cpu_to_le16(SMB_SET_FILE_RENAME_INFORMATION);
        pSMB->Reserved4 = 0;
        pSMB->hdr.smb_buf_length += byte_count;
        pSMB->ByteCount = cpu_to_le16(byte_count);
        rc = SendReceive(xid, pTcon->ses, (struct smb_hdr *) pSMB,
                         (struct smb_hdr *) pSMBr, &bytes_returned, 0);
        cifs_stats_inc(&pTcon->num_t2renames);
        if (rc)
                cFYI(1, "Send error in Rename (by file handle) = %d", rc);

        cifs_buf_release(pSMB);

        /* Note: On -EAGAIN error only caller can retry on handle based calls
                since file handle passed in no longer valid */

        return rc;
}

int
CIFSSMBCopy(const int xid, struct cifsTconInfo *tcon, const char *fromName,
            const __u16 target_tid, const char *toName, const int flags,
            const struct nls_table *nls_codepage, int remap)
{
        int rc = 0;
        COPY_REQ *pSMB = NULL;
        COPY_RSP *pSMBr = NULL;
        int bytes_returned;
        int name_len, name_len2;
        __u16 count;

        cFYI(1, "In CIFSSMBCopy");
copyRetry:
        rc = smb_init(SMB_COM_COPY, 1, tcon, (void **) &pSMB,
                        (void **) &pSMBr);
        if (rc)
                return rc;

        pSMB->BufferFormat = 0x04;
        pSMB->Tid2 = target_tid;

        pSMB->Flags = cpu_to_le16(flags & COPY_TREE);

        if (pSMB->hdr.Flags2 & SMBFLG2_UNICODE) {
                name_len = cifsConvertToUCS((__le16 *) pSMB->OldFileName,
                                            fromName, PATH_MAX, nls_codepage,
                                            remap);
                name_len++;     /* trailing null */
                name_len *= 2;
                pSMB->OldFileName[name_len] = 0x04;     /* pad */
                /* protocol requires ASCII signature byte on Unicode string */
                pSMB->OldFileName[name_len + 1] = 0x00;
                name_len2 =
                    cifsConvertToUCS((__le16 *)&pSMB->OldFileName[name_len + 2],
                                toName, PATH_MAX, nls_codepage, remap);
                name_len2 += 1 /* trailing null */  + 1 /* Signature word */ ;
                name_len2 *= 2; /* convert to bytes */
        } else {        /* BB improve the check for buffer overruns BB */
                name_len = strnlen(fromName, PATH_MAX);
                name_len++;     /* trailing null */
                strncpy(pSMB->OldFileName, fromName, name_len);
                name_len2 = strnlen(toName, PATH_MAX);
                name_len2++;    /* trailing null */
                pSMB->OldFileName[name_len] = 0x04;  /* 2nd buffer format */
                strncpy(&pSMB->OldFileName[name_len + 1], toName, name_len2);
                name_len2++;    /* trailing null */
                name_len2++;    /* signature byte */
        }

        count = 1 /* 1st signature byte */  + name_len + name_len2;
        pSMB->hdr.smb_buf_length += count;
        pSMB->ByteCount = cpu_to_le16(count);

        rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
                (struct smb_hdr *) pSMBr, &bytes_returned, 0);
        if (rc) {
                cFYI(1, "Send error in copy = %d with %d files copied",
                        rc, le16_to_cpu(pSMBr->CopyCount));
        }
        cifs_buf_release(pSMB);

        if (rc == -EAGAIN)
                goto copyRetry;

        return rc;
}

int
CIFSUnixCreateSymLink(const int xid, struct cifsTconInfo *tcon,
                      const char *fromName, const char *toName,
                      const struct nls_table *nls_codepage)
{
        TRANSACTION2_SPI_REQ *pSMB = NULL;
        TRANSACTION2_SPI_RSP *pSMBr = NULL;
        char *data_offset;
        int name_len;
        int name_len_target;
        int rc = 0;
        int bytes_returned = 0;
        __u16 params, param_offset, offset, byte_count;

        cFYI(1, "In Symlink Unix style");
createSymLinkRetry:
        rc = smb_init(SMB_COM_TRANSACTION2, 15, tcon, (void **) &pSMB,
                      (void **) &pSMBr);
        if (rc)
                return rc;

        if (pSMB->hdr.Flags2 & SMBFLG2_UNICODE) {
                name_len =
                    cifs_strtoUCS((__le16 *) pSMB->FileName, fromName, PATH_MAX
                                  /* find define for this maxpathcomponent */
                                  , nls_codepage);
                name_len++;     /* trailing null */
                name_len *= 2;

        } else {        /* BB improve the check for buffer overruns BB */
                name_len = strnlen(fromName, PATH_MAX);
                name_len++;     /* trailing null */
                strncpy(pSMB->FileName, fromName, name_len);
        }
        params = 6 + name_len;
        pSMB->MaxSetupCount = 0;
        pSMB->Reserved = 0;
        pSMB->Flags = 0;
        pSMB->Timeout = 0;
        pSMB->Reserved2 = 0;
        param_offset = offsetof(struct smb_com_transaction2_spi_req,
                                InformationLevel) - 4;
        offset = param_offset + params;

        data_offset = (char *) (&pSMB->hdr.Protocol) + offset;
        if (pSMB->hdr.Flags2 & SMBFLG2_UNICODE) {
                name_len_target =
                    cifs_strtoUCS((__le16 *) data_offset, toName, PATH_MAX
                                  /* find define for this maxpathcomponent */
                                  , nls_codepage);
                name_len_target++;      /* trailing null */
                name_len_target *= 2;
        } else {        /* BB improve the check for buffer overruns BB */
                name_len_target = strnlen(toName, PATH_MAX);
                name_len_target++;      /* trailing null */
                strncpy(data_offset, toName, name_len_target);
        }

        pSMB->MaxParameterCount = cpu_to_le16(2);
        /* BB find exact max on data count below from sess */
        pSMB->MaxDataCount = cpu_to_le16(1000);
        pSMB->SetupCount = 1;
        pSMB->Reserved3 = 0;
        pSMB->SubCommand = cpu_to_le16(TRANS2_SET_PATH_INFORMATION);
        byte_count = 3 /* pad */  + params + name_len_target;
        pSMB->DataCount = cpu_to_le16(name_len_target);
        pSMB->ParameterCount = cpu_to_le16(params);
        pSMB->TotalDataCount = pSMB->DataCount;
        pSMB->TotalParameterCount = pSMB->ParameterCount;
        pSMB->ParameterOffset = cpu_to_le16(param_offset);
        pSMB->DataOffset = cpu_to_le16(offset);
        pSMB->InformationLevel = cpu_to_le16(SMB_SET_FILE_UNIX_LINK);
        pSMB->Reserved4 = 0;
        pSMB->hdr.smb_buf_length += byte_count;
        pSMB->ByteCount = cpu_to_le16(byte_count);
        rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
                         (struct smb_hdr *) pSMBr, &bytes_returned, 0);
        cifs_stats_inc(&tcon->num_symlinks);
        if (rc)
                cFYI(1, "Send error in SetPathInfo create symlink = %d", rc);

        cifs_buf_release(pSMB);

        if (rc == -EAGAIN)
                goto createSymLinkRetry;

        return rc;
}

int
CIFSUnixCreateHardLink(const int xid, struct cifsTconInfo *tcon,
                       const char *fromName, const char *toName,
                       const struct nls_table *nls_codepage, int remap)
{
        TRANSACTION2_SPI_REQ *pSMB = NULL;
        TRANSACTION2_SPI_RSP *pSMBr = NULL;
        char *data_offset;
        int name_len;
        int name_len_target;
        int rc = 0;
        int bytes_returned = 0;
        __u16 params, param_offset, offset, byte_count;

        cFYI(1, "In Create Hard link Unix style");
createHardLinkRetry:
        rc = smb_init(SMB_COM_TRANSACTION2, 15, tcon, (void **) &pSMB,
                      (void **) &pSMBr);
        if (rc)
                return rc;

        if (pSMB->hdr.Flags2 & SMBFLG2_UNICODE) {
                name_len = cifsConvertToUCS((__le16 *) pSMB->FileName, toName,
                                            PATH_MAX, nls_codepage, remap);
                name_len++;     /* trailing null */
                name_len *= 2;

        } else {        /* BB improve the check for buffer overruns BB */
                name_len = strnlen(toName, PATH_MAX);
                name_len++;     /* trailing null */
                strncpy(pSMB->FileName, toName, name_len);
        }
        params = 6 + name_len;
        pSMB->MaxSetupCount = 0;
        pSMB->Reserved = 0;
        pSMB->Flags = 0;
        pSMB->Timeout = 0;
        pSMB->Reserved2 = 0;
        param_offset = offsetof(struct smb_com_transaction2_spi_req,
                                InformationLevel) - 4;
        offset = param_offset + params;

        data_offset = (char *) (&pSMB->hdr.Protocol) + offset;
        if (pSMB->hdr.Flags2 & SMBFLG2_UNICODE) {
                name_len_target =
                    cifsConvertToUCS((__le16 *) data_offset, fromName, PATH_MAX,
                                     nls_codepage, remap);
                name_len_target++;      /* trailing null */
                name_len_target *= 2;
        } else {        /* BB improve the check for buffer overruns BB */
                name_len_target = strnlen(fromName, PATH_MAX);
                name_len_target++;      /* trailing null */
                strncpy(data_offset, fromName, name_len_target);
        }

        pSMB->MaxParameterCount = cpu_to_le16(2);
        /* BB find exact max on data count below from sess*/
        pSMB->MaxDataCount = cpu_to_le16(1000);
        pSMB->SetupCount = 1;
        pSMB->Reserved3 = 0;
        pSMB->SubCommand = cpu_to_le16(TRANS2_SET_PATH_INFORMATION);
        byte_count = 3 /* pad */  + params + name_len_target;
        pSMB->ParameterCount = cpu_to_le16(params);
        pSMB->TotalParameterCount = pSMB->ParameterCount;
        pSMB->DataCount = cpu_to_le16(name_len_target);
        pSMB->TotalDataCount = pSMB->DataCount;
        pSMB->ParameterOffset = cpu_to_le16(param_offset);
        pSMB->DataOffset = cpu_to_le16(offset);
        pSMB->InformationLevel = cpu_to_le16(SMB_SET_FILE_UNIX_HLINK);
        pSMB->Reserved4 = 0;
        pSMB->hdr.smb_buf_length += byte_count;
        pSMB->ByteCount = cpu_to_le16(byte_count);
        rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
                         (struct smb_hdr *) pSMBr, &bytes_returned, 0);
        cifs_stats_inc(&tcon->num_hardlinks);
        if (rc)
                cFYI(1, "Send error in SetPathInfo (hard link) = %d", rc);

        cifs_buf_release(pSMB);
        if (rc == -EAGAIN)
                goto createHardLinkRetry;

        return rc;
}

int
CIFSCreateHardLink(const int xid, struct cifsTconInfo *tcon,
                   const char *fromName, const char *toName,
                   const struct nls_table *nls_codepage, int remap)
{
        int rc = 0;
        NT_RENAME_REQ *pSMB = NULL;
        RENAME_RSP *pSMBr = NULL;
        int bytes_returned;
        int name_len, name_len2;
        __u16 count;

        cFYI(1, "In CIFSCreateHardLink");
winCreateHardLinkRetry:

        rc = smb_init(SMB_COM_NT_RENAME, 4, tcon, (void **) &pSMB,
                      (void **) &pSMBr);
        if (rc)
                return rc;

        pSMB->SearchAttributes =
            cpu_to_le16(ATTR_READONLY | ATTR_HIDDEN | ATTR_SYSTEM |
                        ATTR_DIRECTORY);
        pSMB->Flags = cpu_to_le16(CREATE_HARD_LINK);
        pSMB->ClusterCount = 0;

        pSMB->BufferFormat = 0x04;

        if (pSMB->hdr.Flags2 & SMBFLG2_UNICODE) {
                name_len =
                    cifsConvertToUCS((__le16 *) pSMB->OldFileName, fromName,
                                     PATH_MAX, nls_codepage, remap);
                name_len++;     /* trailing null */
                name_len *= 2;

                /* protocol specifies ASCII buffer format (0x04) for unicode */
                pSMB->OldFileName[name_len] = 0x04;
                pSMB->OldFileName[name_len + 1] = 0x00; /* pad */
                name_len2 =
                    cifsConvertToUCS((__le16 *)&pSMB->OldFileName[name_len + 2],
                                     toName, PATH_MAX, nls_codepage, remap);
                name_len2 += 1 /* trailing null */  + 1 /* Signature word */ ;
                name_len2 *= 2; /* convert to bytes */
        } else {        /* BB improve the check for buffer overruns BB */
                name_len = strnlen(fromName, PATH_MAX);
                name_len++;     /* trailing null */
                strncpy(pSMB->OldFileName, fromName, name_len);
                name_len2 = strnlen(toName, PATH_MAX);
                name_len2++;    /* trailing null */
                pSMB->OldFileName[name_len] = 0x04;     /* 2nd buffer format */
                strncpy(&pSMB->OldFileName[name_len + 1], toName, name_len2);
                name_len2++;    /* trailing null */
                name_len2++;    /* signature byte */
        }

        count = 1 /* string type byte */  + name_len + name_len2;
        pSMB->hdr.smb_buf_length += count;
        pSMB->ByteCount = cpu_to_le16(count);

        rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
                         (struct smb_hdr *) pSMBr, &bytes_returned, 0);
        cifs_stats_inc(&tcon->num_hardlinks);
        if (rc)
                cFYI(1, "Send error in hard link (NT rename) = %d", rc);

        cifs_buf_release(pSMB);
        if (rc == -EAGAIN)
                goto winCreateHardLinkRetry;

        return rc;
}

int
CIFSSMBUnixQuerySymLink(const int xid, struct cifsTconInfo *tcon,
                        const unsigned char *searchName, char **symlinkinfo,
                        const struct nls_table *nls_codepage)
{
/* SMB_QUERY_FILE_UNIX_LINK */
        TRANSACTION2_QPI_REQ *pSMB = NULL;
        TRANSACTION2_QPI_RSP *pSMBr = NULL;
        int rc = 0;
        int bytes_returned;
        int name_len;
        __u16 params, byte_count;
        char *data_start;

        cFYI(1, "In QPathSymLinkInfo (Unix) for path %s", searchName);

querySymLinkRetry:
        rc = smb_init(SMB_COM_TRANSACTION2, 15, tcon, (void **) &pSMB,
                      (void **) &pSMBr);
        if (rc)
                return rc;

        if (pSMB->hdr.Flags2 & SMBFLG2_UNICODE) {
                name_len =
                    cifs_strtoUCS((__le16 *) pSMB->FileName, searchName,
                                  PATH_MAX, nls_codepage);
                name_len++;     /* trailing null */
                name_len *= 2;
        } else {        /* BB improve the check for buffer overruns BB */
                name_len = strnlen(searchName, PATH_MAX);
                name_len++;     /* trailing null */
                strncpy(pSMB->FileName, searchName, name_len);
        }

        params = 2 /* level */  + 4 /* rsrvd */  + name_len /* incl null */ ;
        pSMB->TotalDataCount = 0;
        pSMB->MaxParameterCount = cpu_to_le16(2);
        pSMB->MaxDataCount = cpu_to_le16(CIFSMaxBufSize);
        pSMB->MaxSetupCount = 0;
        pSMB->Reserved = 0;
        pSMB->Flags = 0;
        pSMB->Timeout = 0;
        pSMB->Reserved2 = 0;
        pSMB->ParameterOffset = cpu_to_le16(offsetof(
        struct smb_com_transaction2_qpi_req, InformationLevel) - 4);
        pSMB->DataCount = 0;
        pSMB->DataOffset = 0;
        pSMB->SetupCount = 1;
        pSMB->Reserved3 = 0;
        pSMB->SubCommand = cpu_to_le16(TRANS2_QUERY_PATH_INFORMATION);
        byte_count = params + 1 /* pad */ ;
        pSMB->TotalParameterCount = cpu_to_le16(params);
        pSMB->ParameterCount = pSMB->TotalParameterCount;
        pSMB->InformationLevel = cpu_to_le16(SMB_QUERY_FILE_UNIX_LINK);
        pSMB->Reserved4 = 0;
        pSMB->hdr.smb_buf_length += byte_count;
        pSMB->ByteCount = cpu_to_le16(byte_count);

        rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
                         (struct smb_hdr *) pSMBr, &bytes_returned, 0);
        if (rc) {
                cFYI(1, "Send error in QuerySymLinkInfo = %d", rc);
        } else {
                /* decode response */

                rc = validate_t2((struct smb_t2_rsp *)pSMBr);
                /* BB also check enough total bytes returned */
                if (rc || (pSMBr->ByteCount < 2))
                        rc = -EIO;
                else {
                        bool is_unicode;
                        u16 count = le16_to_cpu(pSMBr->t2.DataCount);

                        data_start = ((char *) &pSMBr->hdr.Protocol) +
                                           le16_to_cpu(pSMBr->t2.DataOffset);

                        if (pSMBr->hdr.Flags2 & SMBFLG2_UNICODE)
                                is_unicode = true;
                        else
                                is_unicode = false;

                        /* BB FIXME investigate remapping reserved chars here */
                        *symlinkinfo = cifs_strndup_from_ucs(data_start, count,
                                                    is_unicode, nls_codepage);
                        if (!*symlinkinfo)
                                rc = -ENOMEM;
                }
        }
        cifs_buf_release(pSMB);
        if (rc == -EAGAIN)
                goto querySymLinkRetry;
        return rc;
}

#ifdef CONFIG_CIFS_EXPERIMENTAL
int
CIFSSMBQueryReparseLinkInfo(const int xid, struct cifsTconInfo *tcon,
                        const unsigned char *searchName,
                        char *symlinkinfo, const int buflen, __u16 fid,
                        const struct nls_table *nls_codepage)
{
        int rc = 0;
        int bytes_returned;
        struct smb_com_transaction_ioctl_req *pSMB;
        struct smb_com_transaction_ioctl_rsp *pSMBr;

        cFYI(1, "In Windows reparse style QueryLink for path %s", searchName);
        rc = smb_init(SMB_COM_NT_TRANSACT, 23, tcon, (void **) &pSMB,
                      (void **) &pSMBr);
        if (rc)
                return rc;

        pSMB->TotalParameterCount = 0 ;
        pSMB->TotalDataCount = 0;
        pSMB->MaxParameterCount = cpu_to_le32(2);
        /* BB find exact data count max from sess structure BB */
        pSMB->MaxDataCount = cpu_to_le32((tcon->ses->server->maxBuf -
                                          MAX_CIFS_HDR_SIZE) & 0xFFFFFF00);
        pSMB->MaxSetupCount = 4;
        pSMB->Reserved = 0;
        pSMB->ParameterOffset = 0;
        pSMB->DataCount = 0;
        pSMB->DataOffset = 0;
        pSMB->SetupCount = 4;
        pSMB->SubCommand = cpu_to_le16(NT_TRANSACT_IOCTL);
        pSMB->ParameterCount = pSMB->TotalParameterCount;
        pSMB->FunctionCode = cpu_to_le32(FSCTL_GET_REPARSE_POINT);
        pSMB->IsFsctl = 1; /* FSCTL */
        pSMB->IsRootFlag = 0;
        pSMB->Fid = fid; /* file handle always le */
        pSMB->ByteCount = 0;

        rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
                         (struct smb_hdr *) pSMBr, &bytes_returned, 0);
        if (rc) {
                cFYI(1, "Send error in QueryReparseLinkInfo = %d", rc);
        } else {                /* decode response */
                __u32 data_offset = le32_to_cpu(pSMBr->DataOffset);
                __u32 data_count = le32_to_cpu(pSMBr->DataCount);
                if ((pSMBr->ByteCount < 2) || (data_offset > 512)) {
                /* BB also check enough total bytes returned */
                        rc = -EIO;      /* bad smb */
                        goto qreparse_out;
                }
                if (data_count && (data_count < 2048)) {
                        char *end_of_smb = 2 /* sizeof byte count */ +
                                pSMBr->ByteCount + (char *)&pSMBr->ByteCount;

                        struct reparse_data *reparse_buf =
                                                (struct reparse_data *)
                                                ((char *)&pSMBr->hdr.Protocol
                                                                 + data_offset);
                        if ((char *)reparse_buf >= end_of_smb) {
                                rc = -EIO;
                                goto qreparse_out;
                        }
                        if ((reparse_buf->LinkNamesBuf +
                                reparse_buf->TargetNameOffset +
                                reparse_buf->TargetNameLen) > end_of_smb) {
                                cFYI(1, "reparse buf beyond SMB");
                                rc = -EIO;
                                goto qreparse_out;
                        }

                        if (pSMBr->hdr.Flags2 & SMBFLG2_UNICODE) {
                                cifs_from_ucs2(symlinkinfo, (__le16 *)
                                                (reparse_buf->LinkNamesBuf +
                                                reparse_buf->TargetNameOffset),
                                                buflen,
                                                reparse_buf->TargetNameLen,
                                                nls_codepage, 0);
                        } else { /* ASCII names */
                                strncpy(symlinkinfo,
                                        reparse_buf->LinkNamesBuf +
                                        reparse_buf->TargetNameOffset,
                                        min_t(const int, buflen,
                                           reparse_buf->TargetNameLen));
                        }
                } else {
                        rc = -EIO;
                        cFYI(1, "Invalid return data count on "
                                 "get reparse info ioctl");
                }
                symlinkinfo[buflen] = 0; /* just in case so the caller
                                        does not go off the end of the buffer */
                cFYI(1, "readlink result - %s", symlinkinfo);
        }

qreparse_out:
        cifs_buf_release(pSMB);

        /* Note: On -EAGAIN error only caller can retry on handle based calls
                since file handle passed in no longer valid */

        return rc;
}
#endif /* CIFS_EXPERIMENTAL */

#ifdef CONFIG_CIFS_POSIX

/*Convert an Access Control Entry from wire format to local POSIX xattr format*/
static void cifs_convert_ace(posix_acl_xattr_entry *ace,
                             struct cifs_posix_ace *cifs_ace)
{
        /* u8 cifs fields do not need le conversion */
        ace->e_perm = cpu_to_le16(cifs_ace->cifs_e_perm);
        ace->e_tag  = cpu_to_le16(cifs_ace->cifs_e_tag);
        ace->e_id   = cpu_to_le32(le64_to_cpu(cifs_ace->cifs_uid));
        /* cFYI(1, "perm %d tag %d id %d",ace->e_perm,ace->e_tag,ace->e_id); */

        return;
}

/* Convert ACL from CIFS POSIX wire format to local Linux POSIX ACL xattr */
static int cifs_copy_posix_acl(char *trgt, char *src, const int buflen,
                               const int acl_type, const int size_of_data_area)
{
        int size =  0;
        int i;
        __u16 count;
        struct cifs_posix_ace *pACE;
        struct cifs_posix_acl *cifs_acl = (struct cifs_posix_acl *)src;
        posix_acl_xattr_header *local_acl = (posix_acl_xattr_header *)trgt;

        if (le16_to_cpu(cifs_acl->version) != CIFS_ACL_VERSION)
                return -EOPNOTSUPP;

        if (acl_type & ACL_TYPE_ACCESS) {
                count = le16_to_cpu(cifs_acl->access_entry_count);
                pACE = &cifs_acl->ace_array[0];
                size = sizeof(struct cifs_posix_acl);
                size += sizeof(struct cifs_posix_ace) * count;
                /* check if we would go beyond end of SMB */
                if (size_of_data_area < size) {
                        cFYI(1, "bad CIFS POSIX ACL size %d vs. %d",
                                size_of_data_area, size);
                        return -EINVAL;
                }
        } else if (acl_type & ACL_TYPE_DEFAULT) {
                count = le16_to_cpu(cifs_acl->access_entry_count);
                size = sizeof(struct cifs_posix_acl);
                size += sizeof(struct cifs_posix_ace) * count;
/* skip past access ACEs to get to default ACEs */
                pACE = &cifs_acl->ace_array[count];
                count = le16_to_cpu(cifs_acl->default_entry_count);
                size += sizeof(struct cifs_posix_ace) * count;
                /* check if we would go beyond end of SMB */
                if (size_of_data_area < size)
                        return -EINVAL;
        } else {
                /* illegal type */
                return -EINVAL;
        }

        size = posix_acl_xattr_size(count);
        if ((buflen == 0) || (local_acl == NULL)) {
                /* used to query ACL EA size */
        } else if (size > buflen) {
                return -ERANGE;
        } else /* buffer big enough */ {
                local_acl->a_version = cpu_to_le32(POSIX_ACL_XATTR_VERSION);
                for (i = 0; i < count ; i++) {
                        cifs_convert_ace(&local_acl->a_entries[i], pACE);
                        pACE++;
                }
        }
        return size;
}

static __u16 convert_ace_to_cifs_ace(struct cifs_posix_ace *cifs_ace,
                                     const posix_acl_xattr_entry *local_ace)
{
        __u16 rc = 0; /* 0 = ACL converted ok */

        cifs_ace->cifs_e_perm = le16_to_cpu(local_ace->e_perm);
        cifs_ace->cifs_e_tag =  le16_to_cpu(local_ace->e_tag);
        /* BB is there a better way to handle the large uid? */
        if (local_ace->e_id == cpu_to_le32(-1)) {
        /* Probably no need to le convert -1 on any arch but can not hurt */
                cifs_ace->cifs_uid = cpu_to_le64(-1);
        } else
                cifs_ace->cifs_uid = cpu_to_le64(le32_to_cpu(local_ace->e_id));
        /*cFYI(1, "perm %d tag %d id %d",ace->e_perm,ace->e_tag,ace->e_id);*/
        return rc;
}

/* Convert ACL from local Linux POSIX xattr to CIFS POSIX ACL wire format */
static __u16 ACL_to_cifs_posix(char *parm_data, const char *pACL,
                               const int buflen, const int acl_type)
{
        __u16 rc = 0;
        struct cifs_posix_acl *cifs_acl = (struct cifs_posix_acl *)parm_data;
        posix_acl_xattr_header *local_acl = (posix_acl_xattr_header *)pACL;
        int count;
        int i;

        if ((buflen == 0) || (pACL == NULL) || (cifs_acl == NULL))
                return 0;

        count = posix_acl_xattr_count((size_t)buflen);
        cFYI(1, "setting acl with %d entries from buf of length %d and "
                "version of %d",
                count, buflen, le32_to_cpu(local_acl->a_version));
        if (le32_to_cpu(local_acl->a_version) != 2) {
                cFYI(1, "unknown POSIX ACL version %d",
                     le32_to_cpu(local_acl->a_version));
                return 0;
        }
        cifs_acl->version = cpu_to_le16(1);
        if (acl_type == ACL_TYPE_ACCESS)
                cifs_acl->access_entry_count = cpu_to_le16(count);
        else if (acl_type == ACL_TYPE_DEFAULT)
                cifs_acl->default_entry_count = cpu_to_le16(count);
        else {
                cFYI(1, "unknown ACL type %d", acl_type);
                return 0;
        }
        for (i = 0; i < count; i++) {
                rc = convert_ace_to_cifs_ace(&cifs_acl->ace_array[i],
                                        &local_acl->a_entries[i]);
                if (rc != 0) {
                        /* ACE not converted */
                        break;
                }
        }
        if (rc == 0) {
                rc = (__u16)(count * sizeof(struct cifs_posix_ace));
                rc += sizeof(struct cifs_posix_acl);
                /* BB add check to make sure ACL does not overflow SMB */
        }
        return rc;
}

int
CIFSSMBGetPosixACL(const int xid, struct cifsTconInfo *tcon,
                   const unsigned char *searchName,
                   char *acl_inf, const int buflen, const int acl_type,
                   const struct nls_table *nls_codepage, int remap)
{
/* SMB_QUERY_POSIX_ACL */
        TRANSACTION2_QPI_REQ *pSMB = NULL;
        TRANSACTION2_QPI_RSP *pSMBr = NULL;
        int rc = 0;
        int bytes_returned;
        int name_len;
        __u16 params, byte_count;

        cFYI(1, "In GetPosixACL (Unix) for path %s", searchName);

queryAclRetry:
        rc = smb_init(SMB_COM_TRANSACTION2, 15, tcon, (void **) &pSMB,
                (void **) &pSMBr);
        if (rc)
                return rc;

        if (pSMB->hdr.Flags2 & SMBFLG2_UNICODE) {
                name_len =
                        cifsConvertToUCS((__le16 *) pSMB->FileName, searchName,
                                         PATH_MAX, nls_codepage, remap);
                name_len++;     /* trailing null */
                name_len *= 2;
                pSMB->FileName[name_len] = 0;
                pSMB->FileName[name_len+1] = 0;
        } else {        /* BB improve the check for buffer overruns BB */
                name_len = strnlen(searchName, PATH_MAX);
                name_len++;     /* trailing null */
                strncpy(pSMB->FileName, searchName, name_len);
        }

        params = 2 /* level */  + 4 /* rsrvd */  + name_len /* incl null */ ;
        pSMB->TotalDataCount = 0;
        pSMB->MaxParameterCount = cpu_to_le16(2);
        /* BB find exact max data count below from sess structure BB */
        pSMB->MaxDataCount = cpu_to_le16(4000);
        pSMB->MaxSetupCount = 0;
        pSMB->Reserved = 0;
        pSMB->Flags = 0;
        pSMB->Timeout = 0;
        pSMB->Reserved2 = 0;
        pSMB->ParameterOffset = cpu_to_le16(
                offsetof(struct smb_com_transaction2_qpi_req,
                         InformationLevel) - 4);
        pSMB->DataCount = 0;
        pSMB->DataOffset = 0;
        pSMB->SetupCount = 1;
        pSMB->Reserved3 = 0;
        pSMB->SubCommand = cpu_to_le16(TRANS2_QUERY_PATH_INFORMATION);
        byte_count = params + 1 /* pad */ ;
        pSMB->TotalParameterCount = cpu_to_le16(params);
        pSMB->ParameterCount = pSMB->TotalParameterCount;
        pSMB->InformationLevel = cpu_to_le16(SMB_QUERY_POSIX_ACL);
        pSMB->Reserved4 = 0;
        pSMB->hdr.smb_buf_length += byte_count;
        pSMB->ByteCount = cpu_to_le16(byte_count);

        rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
                (struct smb_hdr *) pSMBr, &bytes_returned, 0);
        cifs_stats_inc(&tcon->num_acl_get);
        if (rc) {
                cFYI(1, "Send error in Query POSIX ACL = %d", rc);
        } else {
                /* decode response */

                rc = validate_t2((struct smb_t2_rsp *)pSMBr);
                if (rc || (pSMBr->ByteCount < 2))
                /* BB also check enough total bytes returned */
                        rc = -EIO;      /* bad smb */
                else {
                        __u16 data_offset = le16_to_cpu(pSMBr->t2.DataOffset);
                        __u16 count = le16_to_cpu(pSMBr->t2.DataCount);
                        rc = cifs_copy_posix_acl(acl_inf,
                                (char *)&pSMBr->hdr.Protocol+data_offset,
                                buflen, acl_type, count);
                }
        }
        cifs_buf_release(pSMB);
        if (rc == -EAGAIN)
                goto queryAclRetry;
        return rc;
}

int
CIFSSMBSetPosixACL(const int xid, struct cifsTconInfo *tcon,
                   const unsigned char *fileName,
                   const char *local_acl, const int buflen,
                   const int acl_type,
                   const struct nls_table *nls_codepage, int remap)
{
        struct smb_com_transaction2_spi_req *pSMB = NULL;
        struct smb_com_transaction2_spi_rsp *pSMBr = NULL;
        char *parm_data;
        int name_len;
        int rc = 0;
        int bytes_returned = 0;
        __u16 params, byte_count, data_count, param_offset, offset;

        cFYI(1, "In SetPosixACL (Unix) for path %s", fileName);
setAclRetry:
        rc = smb_init(SMB_COM_TRANSACTION2, 15, tcon, (void **) &pSMB,
                      (void **) &pSMBr);
        if (rc)
                return rc;
        if (pSMB->hdr.Flags2 & SMBFLG2_UNICODE) {
                name_len =
                        cifsConvertToUCS((__le16 *) pSMB->FileName, fileName,
                                      PATH_MAX, nls_codepage, remap);
                name_len++;     /* trailing null */
                name_len *= 2;
        } else {        /* BB improve the check for buffer overruns BB */
                name_len = strnlen(fileName, PATH_MAX);
                name_len++;     /* trailing null */
                strncpy(pSMB->FileName, fileName, name_len);
        }
        params = 6 + name_len;
        pSMB->MaxParameterCount = cpu_to_le16(2);
        /* BB find max SMB size from sess */
        pSMB->MaxDataCount = cpu_to_le16(1000);
        pSMB->MaxSetupCount = 0;
        pSMB->Reserved = 0;
        pSMB->Flags = 0;
        pSMB->Timeout = 0;
        pSMB->Reserved2 = 0;
        param_offset = offsetof(struct smb_com_transaction2_spi_req,
                                InformationLevel) - 4;
        offset = param_offset + params;
        parm_data = ((char *) &pSMB->hdr.Protocol) + offset;
        pSMB->ParameterOffset = cpu_to_le16(param_offset);

        /* convert to on the wire format for POSIX ACL */
        data_count = ACL_to_cifs_posix(parm_data, local_acl, buflen, acl_type);

        if (data_count == 0) {
                rc = -EOPNOTSUPP;
                goto setACLerrorExit;
        }
        pSMB->DataOffset = cpu_to_le16(offset);
        pSMB->SetupCount = 1;
        pSMB->Reserved3 = 0;
        pSMB->SubCommand = cpu_to_le16(TRANS2_SET_PATH_INFORMATION);
        pSMB->InformationLevel = cpu_to_le16(SMB_SET_POSIX_ACL);
        byte_count = 3 /* pad */  + params + data_count;
        pSMB->DataCount = cpu_to_le16(data_count);
        pSMB->TotalDataCount = pSMB->DataCount;
        pSMB->ParameterCount = cpu_to_le16(params);
        pSMB->TotalParameterCount = pSMB->ParameterCount;
        pSMB->Reserved4 = 0;
        pSMB->hdr.smb_buf_length += byte_count;
        pSMB->ByteCount = cpu_to_le16(byte_count);
        rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
                         (struct smb_hdr *) pSMBr, &bytes_returned, 0);
        if (rc)
                cFYI(1, "Set POSIX ACL returned %d", rc);

setACLerrorExit:
        cifs_buf_release(pSMB);
        if (rc == -EAGAIN)
                goto setAclRetry;
        return rc;
}

/* BB fix tabs in this function FIXME BB */
int
CIFSGetExtAttr(const int xid, struct cifsTconInfo *tcon,
               const int netfid, __u64 *pExtAttrBits, __u64 *pMask)
{
        int rc = 0;
        struct smb_t2_qfi_req *pSMB = NULL;
        struct smb_t2_qfi_rsp *pSMBr = NULL;
        int bytes_returned;
        __u16 params, byte_count;

        cFYI(1, "In GetExtAttr");
        if (tcon == NULL)
                return -ENODEV;

GetExtAttrRetry:
        rc = smb_init(SMB_COM_TRANSACTION2, 15, tcon, (void **) &pSMB,
                        (void **) &pSMBr);
        if (rc)
                return rc;

        params = 2 /* level */ + 2 /* fid */;
        pSMB->t2.TotalDataCount = 0;
        pSMB->t2.MaxParameterCount = cpu_to_le16(4);
        /* BB find exact max data count below from sess structure BB */
        pSMB->t2.MaxDataCount = cpu_to_le16(4000);
        pSMB->t2.MaxSetupCount = 0;
        pSMB->t2.Reserved = 0;
        pSMB->t2.Flags = 0;
        pSMB->t2.Timeout = 0;
        pSMB->t2.Reserved2 = 0;
        pSMB->t2.ParameterOffset = cpu_to_le16(offsetof(struct smb_t2_qfi_req,
                                               Fid) - 4);
        pSMB->t2.DataCount = 0;
        pSMB->t2.DataOffset = 0;
        pSMB->t2.SetupCount = 1;
        pSMB->t2.Reserved3 = 0;
        pSMB->t2.SubCommand = cpu_to_le16(TRANS2_QUERY_FILE_INFORMATION);
        byte_count = params + 1 /* pad */ ;
        pSMB->t2.TotalParameterCount = cpu_to_le16(params);
        pSMB->t2.ParameterCount = pSMB->t2.TotalParameterCount;
        pSMB->InformationLevel = cpu_to_le16(SMB_QUERY_ATTR_FLAGS);
        pSMB->Pad = 0;
        pSMB->Fid = netfid;
        pSMB->hdr.smb_buf_length += byte_count;
        pSMB->t2.ByteCount = cpu_to_le16(byte_count);

        rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
                         (struct smb_hdr *) pSMBr, &bytes_returned, 0);
        if (rc) {
                cFYI(1, "error %d in GetExtAttr", rc);
        } else {
                /* decode response */
                rc = validate_t2((struct smb_t2_rsp *)pSMBr);
                if (rc || (pSMBr->ByteCount < 2))
                /* BB also check enough total bytes returned */
                        /* If rc should we check for EOPNOSUPP and
                           disable the srvino flag? or in caller? */
                        rc = -EIO;      /* bad smb */
                else {
                        __u16 data_offset = le16_to_cpu(pSMBr->t2.DataOffset);
                        __u16 count = le16_to_cpu(pSMBr->t2.DataCount);
                        struct file_chattr_info *pfinfo;
                        /* BB Do we need a cast or hash here ? */
                        if (count != 16) {
                                cFYI(1, "Illegal size ret in GetExtAttr");
                                rc = -EIO;
                                goto GetExtAttrOut;
                        }
                        pfinfo = (struct file_chattr_info *)
                                 (data_offset + (char *) &pSMBr->hdr.Protocol);
                        *pExtAttrBits = le64_to_cpu(pfinfo->mode);
                        *pMask = le64_to_cpu(pfinfo->mask);
                }
        }
GetExtAttrOut: