/*
 *  SMB1 (CIFS) version specific operations
 *
 *  Copyright (c) 2012, Jeff Layton <jlayton@redhat.com>
 *
 *  This library is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License v2 as published
 *  by the Free Software Foundation.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 *  the GNU Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with this library; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include "cifsglob.h"
#include "cifsproto.h"
#include "cifs_debug.h"
#include "cifspdu.h"

/*
 * An NT cancel request header looks just like the original request except:
 *
 * The Command is SMB_COM_NT_CANCEL
 * The WordCount is zeroed out
 * The ByteCount is zeroed out
 *
 * This function mangles an existing request buffer into a
 * SMB_COM_NT_CANCEL request and then sends it.
 */
static int
send_nt_cancel(struct TCP_Server_Info *server, void *buf,
               struct mid_q_entry *mid)
{
        int rc = 0;
        struct smb_hdr *in_buf = (struct smb_hdr *)buf;

        /* -4 for RFC1001 length and +2 for BCC field */
        in_buf->smb_buf_length = cpu_to_be32(sizeof(struct smb_hdr) - 4  + 2);
        in_buf->Command = SMB_COM_NT_CANCEL;
        in_buf->WordCount = 0;
        put_bcc(0, in_buf);

        mutex_lock(&server->srv_mutex);
        rc = cifs_sign_smb(in_buf, server, &mid->sequence_number);
        if (rc) {
                mutex_unlock(&server->srv_mutex);
                return rc;
        }
        rc = smb_send(server, in_buf, be32_to_cpu(in_buf->smb_buf_length));
        mutex_unlock(&server->srv_mutex);

        cFYI(1, "issued NT_CANCEL for mid %u, rc = %d",
                in_buf->Mid, rc);

        return rc;
}

static bool
cifs_compare_fids(struct cifsFileInfo *ob1, struct cifsFileInfo *ob2)
{
        return ob1->netfid == ob2->netfid;
}

static unsigned int
cifs_read_data_offset(char *buf)
{
        READ_RSP *rsp = (READ_RSP *)buf;
        return le16_to_cpu(rsp->DataOffset);
}

static unsigned int
cifs_read_data_length(char *buf)
{
        READ_RSP *rsp = (READ_RSP *)buf;
        return (le16_to_cpu(rsp->DataLengthHigh) << 16) +
               le16_to_cpu(rsp->DataLength);
}

static struct mid_q_entry *
cifs_find_mid(struct TCP_Server_Info *server, char *buffer)
{
        struct smb_hdr *buf = (struct smb_hdr *)buffer;
        struct mid_q_entry *mid;

        spin_lock(&GlobalMid_Lock);
        list_for_each_entry(mid, &server->pending_mid_q, qhead) {
                if (mid->mid == buf->Mid &&
                    mid->mid_state == MID_REQUEST_SUBMITTED &&
                    le16_to_cpu(mid->command) == buf->Command) {
                        spin_unlock(&GlobalMid_Lock);
                        return mid;
                }
        }
        spin_unlock(&GlobalMid_Lock);
        return NULL;
}

static void
cifs_add_credits(struct TCP_Server_Info *server, const unsigned int add,
                 const int optype)
{
        spin_lock(&server->req_lock);
        server->credits += add;
        server->in_flight--;
        spin_unlock(&server->req_lock);
        wake_up(&server->request_q);
}

static void
cifs_set_credits(struct TCP_Server_Info *server, const int val)
{
        spin_lock(&server->req_lock);
        server->credits = val;
        server->oplocks = val > 1 ? enable_oplocks : false;
        spin_unlock(&server->req_lock);
}

static int *
cifs_get_credits_field(struct TCP_Server_Info *server, const int optype)
{
        return &server->credits;
}

static unsigned int
cifs_get_credits(struct mid_q_entry *mid)
{
        return 1;
}

/*
 * Find a free multiplex id (SMB mid). Otherwise there could be
 * mid collisions which might cause problems, demultiplexing the
 * wrong response to this request. Multiplex ids could collide if
 * one of a series requests takes much longer than the others, or
 * if a very large number of long lived requests (byte range
 * locks or FindNotify requests) are pending. No more than
 * 64K-1 requests can be outstanding at one time. If no
 * mids are available, return zero. A future optimization
 * could make the combination of mids and uid the key we use
 * to demultiplex on (rather than mid alone).
 * In addition to the above check, the cifs demultiplex
 * code already used the command code as a secondary
 * check of the frame and if signing is negotiated the
 * response would be discarded if the mid were the same
 * but the signature was wrong. Since the mid is not put in the
 * pending queue until later (when it is about to be dispatched)
 * we do have to limit the number of outstanding requests
 * to somewhat less than 64K-1 although it is hard to imagine
 * so many threads being in the vfs at one time.
 */
static __u64
cifs_get_next_mid(struct TCP_Server_Info *server)
{
        __u64 mid = 0;
        __u16 last_mid, cur_mid;
        bool collision;

        spin_lock(&GlobalMid_Lock);

        /* mid is 16 bit only for CIFS/SMB */
        cur_mid = (__u16)((server->CurrentMid) & 0xffff);
        /* we do not want to loop forever */
        last_mid = cur_mid;
        cur_mid++;

        /*
         * This nested loop looks more expensive than it is.
         * In practice the list of pending requests is short,
         * fewer than 50, and the mids are likely to be unique
         * on the first pass through the loop unless some request
         * takes longer than the 64 thousand requests before it
         * (and it would also have to have been a request that
         * did not time out).
         */
        while (cur_mid != last_mid) {
                struct mid_q_entry *mid_entry;
                unsigned int num_mids;

                collision = false;
                if (cur_mid == 0)
                        cur_mid++;

                num_mids = 0;
                list_for_each_entry(mid_entry, &server->pending_mid_q, qhead) {
                        ++num_mids;
                        if (mid_entry->mid == cur_mid &&
                            mid_entry->mid_state == MID_REQUEST_SUBMITTED) {
                                /* This mid is in use, try a different one */
                                collision = true;
                                break;
                        }
                }

                /*
                 * if we have more than 32k mids in the list, then something
                 * is very wrong. Possibly a local user is trying to DoS the
                 * box by issuing long-running calls and SIGKILL'ing them. If
                 * we get to 2^16 mids then we're in big trouble as this
                 * function could loop forever.
                 *
                 * Go ahead and assign out the mid in this situation, but force
                 * an eventual reconnect to clean out the pending_mid_q.
                 */
                if (num_mids > 32768)
                        server->tcpStatus = CifsNeedReconnect;

                if (!collision) {
                        mid = (__u64)cur_mid;
                        server->CurrentMid = mid;
                        break;
                }
                cur_mid++;
        }
        spin_unlock(&GlobalMid_Lock);
        return mid;
}

/*
        return codes:
                0       not a transact2, or all data present
                >0      transact2 with that much data missing
                -EINVAL invalid transact2
 */
static int
check2ndT2(char *buf)
{
        struct smb_hdr *pSMB = (struct smb_hdr *)buf;
        struct smb_t2_rsp *pSMBt;
        int remaining;
        __u16 total_data_size, data_in_this_rsp;

        if (pSMB->Command != SMB_COM_TRANSACTION2)
                return 0;

        /* check for plausible wct, bcc and t2 data and parm sizes */
        /* check for parm and data offset going beyond end of smb */
        if (pSMB->WordCount != 10) { /* coalesce_t2 depends on this */
                cFYI(1, "invalid transact2 word count");
                return -EINVAL;
        }

        pSMBt = (struct smb_t2_rsp *)pSMB;

        total_data_size = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);
        data_in_this_rsp = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);

        if (total_data_size == data_in_this_rsp)
                return 0;
        else if (total_data_size < data_in_this_rsp) {
                cFYI(1, "total data %d smaller than data in frame %d",
                        total_data_size, data_in_this_rsp);
                return -EINVAL;
        }

        remaining = total_data_size - data_in_this_rsp;

        cFYI(1, "missing %d bytes from transact2, check next response",
                remaining);
        if (total_data_size > CIFSMaxBufSize) {
                cERROR(1, "TotalDataSize %d is over maximum buffer %d",
                        total_data_size, CIFSMaxBufSize);
                return -EINVAL;
        }
        return remaining;
}

static int
coalesce_t2(char *second_buf, struct smb_hdr *target_hdr)
{
        struct smb_t2_rsp *pSMBs = (struct smb_t2_rsp *)second_buf;
        struct smb_t2_rsp *pSMBt  = (struct smb_t2_rsp *)target_hdr;
        char *data_area_of_tgt;
        char *data_area_of_src;
        int remaining;
        unsigned int byte_count, total_in_tgt;
        __u16 tgt_total_cnt, src_total_cnt, total_in_src;

        src_total_cnt = get_unaligned_le16(&pSMBs->t2_rsp.TotalDataCount);
        tgt_total_cnt = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);

        if (tgt_total_cnt != src_total_cnt)
                cFYI(1, "total data count of primary and secondary t2 differ "
                        "source=%hu target=%hu", src_total_cnt, tgt_total_cnt);

        total_in_tgt = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);

        remaining = tgt_total_cnt - total_in_tgt;

        if (remaining < 0) {
                cFYI(1, "Server sent too much data. tgt_total_cnt=%hu "
                        "total_in_tgt=%hu", tgt_total_cnt, total_in_tgt);
                return -EPROTO;
        }

        if (remaining == 0) {
                /* nothing to do, ignore */
                cFYI(1, "no more data remains");
                return 0;
        }

        total_in_src = get_unaligned_le16(&pSMBs->t2_rsp.DataCount);
        if (remaining < total_in_src)
                cFYI(1, "transact2 2nd response contains too much data");

        /* find end of first SMB data area */
        data_area_of_tgt = (char *)&pSMBt->hdr.Protocol +
                                get_unaligned_le16(&pSMBt->t2_rsp.DataOffset);

        /* validate target area */
        data_area_of_src = (char *)&pSMBs->hdr.Protocol +
                                get_unaligned_le16(&pSMBs->t2_rsp.DataOffset);

        data_area_of_tgt += total_in_tgt;

        total_in_tgt += total_in_src;
        /* is the result too big for the field? */
        if (total_in_tgt > USHRT_MAX) {
                cFYI(1, "coalesced DataCount too large (%u)", total_in_tgt);
                return -EPROTO;
        }
        put_unaligned_le16(total_in_tgt, &pSMBt->t2_rsp.DataCount);

        /* fix up the BCC */
        byte_count = get_bcc(target_hdr);
        byte_count += total_in_src;
        /* is the result too big for the field? */
        if (byte_count > USHRT_MAX) {
                cFYI(1, "coalesced BCC too large (%u)", byte_count);
                return -EPROTO;
        }
        put_bcc(byte_count, target_hdr);

        byte_count = be32_to_cpu(target_hdr->smb_buf_length);
        byte_count += total_in_src;
        /* don't allow buffer to overflow */
        if (byte_count > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
                cFYI(1, "coalesced BCC exceeds buffer size (%u)", byte_count);
                return -ENOBUFS;
        }
        target_hdr->smb_buf_length = cpu_to_be32(byte_count);

        /* copy second buffer into end of first buffer */
        memcpy(data_area_of_tgt, data_area_of_src, total_in_src);

        if (remaining != total_in_src) {
                /* more responses to go */
                cFYI(1, "waiting for more secondary responses");
                return 1;
        }

        /* we are done */
        cFYI(1, "found the last secondary response");
        return 0;
}

static bool
cifs_check_trans2(struct mid_q_entry *mid, struct TCP_Server_Info *server,
                  char *buf, int malformed)
{
        if (malformed)
                return false;
        if (check2ndT2(buf) <= 0)
                return false;
        mid->multiRsp = true;
        if (mid->resp_buf) {
                /* merge response - fix up 1st*/
                malformed = coalesce_t2(buf, mid->resp_buf);
                if (malformed > 0)
                        return true;
                /* All parts received or packet is malformed. */
                mid->multiEnd = true;
                dequeue_mid(mid, malformed);
                return true;
        }
        if (!server->large_buf) {
                /*FIXME: switch to already allocated largebuf?*/
                cERROR(1, "1st trans2 resp needs bigbuf");
        } else {
                /* Have first buffer */
                mid->resp_buf = buf;
                mid->large_buf = true;
                server->bigbuf = NULL;
        }
        return true;
}

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

static int
cifs_negotiate(const unsigned int xid, struct cifs_ses *ses)
{
        int rc;
        rc = CIFSSMBNegotiate(xid, ses);
        if (rc == -EAGAIN) {
                /* retry only once on 1st time connection */
                set_credits(ses->server, 1);
                rc = CIFSSMBNegotiate(xid, ses);
                if (rc == -EAGAIN)
                        rc = -EHOSTDOWN;
        }
        return rc;
}

static void
cifs_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon)
{
        CIFSSMBQFSDeviceInfo(xid, tcon);
        CIFSSMBQFSAttributeInfo(xid, tcon);
}

static int
cifs_is_path_accessible(const unsigned int xid, struct cifs_tcon *tcon,
                        struct cifs_sb_info *cifs_sb, const char *full_path)
{
        int rc;
        FILE_ALL_INFO *file_info;

        file_info = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
        if (file_info == NULL)
                return -ENOMEM;

        rc = CIFSSMBQPathInfo(xid, tcon, full_path, file_info,
                              0 /* not legacy */, cifs_sb->local_nls,
                              cifs_sb->mnt_cifs_flags &
                                CIFS_MOUNT_MAP_SPECIAL_CHR);

        if (rc == -EOPNOTSUPP || rc == -EINVAL)
                rc = SMBQueryInformation(xid, tcon, full_path, file_info,
                                cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
                                  CIFS_MOUNT_MAP_SPECIAL_CHR);
        kfree(file_info);
        return rc;
}

static int
cifs_query_path_info(const unsigned int xid, struct cifs_tcon *tcon,
                     struct cifs_sb_info *cifs_sb, const char *full_path,
                     FILE_ALL_INFO *data, bool *adjustTZ)
{
        int rc;

        /* could do find first instead but this returns more info */
        rc = CIFSSMBQPathInfo(xid, tcon, full_path, data, 0 /* not legacy */,
                              cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
                                                CIFS_MOUNT_MAP_SPECIAL_CHR);
        /*
         * BB optimize code so we do not make the above call when server claims
         * no NT SMB support and the above call failed at least once - set flag
         * in tcon or mount.
         */
        if ((rc == -EOPNOTSUPP) || (rc == -EINVAL)) {
                rc = SMBQueryInformation(xid, tcon, full_path, data,
                                         cifs_sb->local_nls,
                                         cifs_sb->mnt_cifs_flags &
                                                CIFS_MOUNT_MAP_SPECIAL_CHR);
                *adjustTZ = true;
        }
        return rc;
}

static int
cifs_get_srv_inum(const unsigned int xid, struct cifs_tcon *tcon,
                  struct cifs_sb_info *cifs_sb, const char *full_path,
                  u64 *uniqueid, FILE_ALL_INFO *data)
{
        /*
         * We can not use the IndexNumber field by default from Windows or
         * Samba (in ALL_INFO buf) but we can request it explicitly. The SNIA
         * CIFS spec claims that this value is unique within the scope of a
         * share, and the windows docs hint that it's actually unique
         * per-machine.
         *
         * There may be higher info levels that work but are there Windows
         * server or network appliances for which IndexNumber field is not
         * guaranteed unique?
         */
        return CIFSGetSrvInodeNumber(xid, tcon, full_path, uniqueid,
                                     cifs_sb->local_nls,
                                     cifs_sb->mnt_cifs_flags &
                                                CIFS_MOUNT_MAP_SPECIAL_CHR);
}

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

        /* if no prefix path, simply set path to the root of share to "" */
        if (pplen == 0) {
                full_path = kzalloc(1, GFP_KERNEL);
                return full_path;
        }

        if (tcon->Flags & SMB_SHARE_IS_IN_DFS)
                dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
        else
                dfsplen = 0;

        full_path = kmalloc(dfsplen + pplen + 1, GFP_KERNEL);
        if (full_path == NULL)
                return full_path;

        if (dfsplen)
                strncpy(full_path, tcon->treeName, dfsplen);
        strncpy(full_path + dfsplen, vol->prepath, pplen);
        convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
        full_path[dfsplen + pplen] = 0; /* add trailing null */
        return full_path;
}

static void
cifs_clear_stats(struct cifs_tcon *tcon)
{
#ifdef CONFIG_CIFS_STATS
        atomic_set(&tcon->stats.cifs_stats.num_writes, 0);
        atomic_set(&tcon->stats.cifs_stats.num_reads, 0);
        atomic_set(&tcon->stats.cifs_stats.num_flushes, 0);
        atomic_set(&tcon->stats.cifs_stats.num_oplock_brks, 0);
        atomic_set(&tcon->stats.cifs_stats.num_opens, 0);
        atomic_set(&tcon->stats.cifs_stats.num_posixopens, 0);
        atomic_set(&tcon->stats.cifs_stats.num_posixmkdirs, 0);
        atomic_set(&tcon->stats.cifs_stats.num_closes, 0);
        atomic_set(&tcon->stats.cifs_stats.num_deletes, 0);
        atomic_set(&tcon->stats.cifs_stats.num_mkdirs, 0);
        atomic_set(&tcon->stats.cifs_stats.num_rmdirs, 0);
        atomic_set(&tcon->stats.cifs_stats.num_renames, 0);
        atomic_set(&tcon->stats.cifs_stats.num_t2renames, 0);
        atomic_set(&tcon->stats.cifs_stats.num_ffirst, 0);
        atomic_set(&tcon->stats.cifs_stats.num_fnext, 0);
        atomic_set(&tcon->stats.cifs_stats.num_fclose, 0);
        atomic_set(&tcon->stats.cifs_stats.num_hardlinks, 0);
        atomic_set(&tcon->stats.cifs_stats.num_symlinks, 0);
        atomic_set(&tcon->stats.cifs_stats.num_locks, 0);
        atomic_set(&tcon->stats.cifs_stats.num_acl_get, 0);
        atomic_set(&tcon->stats.cifs_stats.num_acl_set, 0);
#endif
}

static void
cifs_print_stats(struct seq_file *m, struct cifs_tcon *tcon)
{
#ifdef CONFIG_CIFS_STATS
        seq_printf(m, " Oplocks breaks: %d",
                   atomic_read(&tcon->stats.cifs_stats.num_oplock_brks));
        seq_printf(m, "\nReads:  %d Bytes: %llu",
                   atomic_read(&tcon->stats.cifs_stats.num_reads),
                   (long long)(tcon->bytes_read));
        seq_printf(m, "\nWrites: %d Bytes: %llu",
                   atomic_read(&tcon->stats.cifs_stats.num_writes),
                   (long long)(tcon->bytes_written));
        seq_printf(m, "\nFlushes: %d",
                   atomic_read(&tcon->stats.cifs_stats.num_flushes));
        seq_printf(m, "\nLocks: %d HardLinks: %d Symlinks: %d",
                   atomic_read(&tcon->stats.cifs_stats.num_locks),
                   atomic_read(&tcon->stats.cifs_stats.num_hardlinks),
                   atomic_read(&tcon->stats.cifs_stats.num_symlinks));
        seq_printf(m, "\nOpens: %d Closes: %d Deletes: %d",
                   atomic_read(&tcon->stats.cifs_stats.num_opens),
                   atomic_read(&tcon->stats.cifs_stats.num_closes),
                   atomic_read(&tcon->stats.cifs_stats.num_deletes));
        seq_printf(m, "\nPosix Opens: %d Posix Mkdirs: %d",
                   atomic_read(&tcon->stats.cifs_stats.num_posixopens),
                   atomic_read(&tcon->stats.cifs_stats.num_posixmkdirs));
        seq_printf(m, "\nMkdirs: %d Rmdirs: %d",
                   atomic_read(&tcon->stats.cifs_stats.num_mkdirs),
                   atomic_read(&tcon->stats.cifs_stats.num_rmdirs));
        seq_printf(m, "\nRenames: %d T2 Renames %d",
                   atomic_read(&tcon->stats.cifs_stats.num_renames),
                   atomic_read(&tcon->stats.cifs_stats.num_t2renames));
        seq_printf(m, "\nFindFirst: %d FNext %d FClose %d",
                   atomic_read(&tcon->stats.cifs_stats.num_ffirst),
                   atomic_read(&tcon->stats.cifs_stats.num_fnext),
                   atomic_read(&tcon->stats.cifs_stats.num_fclose));
#endif
}

static void
cifs_mkdir_setinfo(struct inode *inode, const char *full_path,
                   struct cifs_sb_info *cifs_sb, struct cifs_tcon *tcon,
                   const unsigned int xid)
{
        FILE_BASIC_INFO info;
        struct cifsInodeInfo *cifsInode;
        u32 dosattrs;
        int rc;

        memset(&info, 0, sizeof(info));
        cifsInode = CIFS_I(inode);
        dosattrs = cifsInode->cifsAttrs|ATTR_READONLY;
        info.Attributes = cpu_to_le32(dosattrs);
        rc = CIFSSMBSetPathInfo(xid, tcon, full_path, &info, cifs_sb->local_nls,
                                cifs_sb->mnt_cifs_flags &
                                                CIFS_MOUNT_MAP_SPECIAL_CHR);
        if (rc == 0)
                cifsInode->cifsAttrs = dosattrs;
}

struct smb_version_operations smb1_operations = {
        .send_cancel = send_nt_cancel,
        .compare_fids = cifs_compare_fids,
        .setup_request = cifs_setup_request,
        .setup_async_request = cifs_setup_async_request,
        .check_receive = cifs_check_receive,
        .add_credits = cifs_add_credits,
        .set_credits = cifs_set_credits,
        .get_credits_field = cifs_get_credits_field,
        .get_credits = cifs_get_credits,
        .get_next_mid = cifs_get_next_mid,
        .read_data_offset = cifs_read_data_offset,
        .read_data_length = cifs_read_data_length,
        .map_error = map_smb_to_linux_error,
        .find_mid = cifs_find_mid,
        .check_message = checkSMB,
        .dump_detail = cifs_dump_detail,
        .clear_stats = cifs_clear_stats,
        .print_stats = cifs_print_stats,
        .is_oplock_break = is_valid_oplock_break,
        .check_trans2 = cifs_check_trans2,
        .need_neg = cifs_need_neg,
        .negotiate = cifs_negotiate,
        .sess_setup = CIFS_SessSetup,
        .logoff = CIFSSMBLogoff,
        .tree_connect = CIFSTCon,
        .tree_disconnect = CIFSSMBTDis,
        .get_dfs_refer = CIFSGetDFSRefer,
        .qfs_tcon = cifs_qfs_tcon,
        .is_path_accessible = cifs_is_path_accessible,
        .query_path_info = cifs_query_path_info,
        .get_srv_inum = cifs_get_srv_inum,
        .build_path_to_root = cifs_build_path_to_root,
        .echo = CIFSSMBEcho,
        .mkdir = CIFSSMBMkDir,
        .mkdir_setinfo = cifs_mkdir_setinfo,
        .rmdir = CIFSSMBRmDir,
};

struct smb_version_values smb1_values = {
        .version_string = SMB1_VERSION_STRING,
        .large_lock_type = LOCKING_ANDX_LARGE_FILES,
        .exclusive_lock_type = 0,
        .shared_lock_type = LOCKING_ANDX_SHARED_LOCK,
        .unlock_lock_type = 0,
        .header_size = sizeof(struct smb_hdr),
        .max_header_size = MAX_CIFS_HDR_SIZE,
        .read_rsp_size = sizeof(READ_RSP),
        .lock_cmd = cpu_to_le16(SMB_COM_LOCKING_ANDX),
        .cap_unix = CAP_UNIX,
        .cap_nt_find = CAP_NT_SMBS | CAP_NT_FIND,
        .cap_large_files = CAP_LARGE_FILES,
};