smb2ops.c

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/*
 *  SMB2 version specific operations
 *
 *  Copyright (c) 2012, Jeff Layton <[email protected]>
 *
 *  This library is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License v2 as published
 *  by the Free Software Foundation.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 *  the GNU Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with this library; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include <linux/pagemap.h>
#include <linux/vfs.h>
#include "cifsglob.h"
#include "smb2pdu.h"
#include "smb2proto.h"
#include "cifsproto.h"
#include "cifs_debug.h"
#include "smb2status.h"
#include "smb2glob.h"

static int
change_conf(struct TCP_Server_Info *server)
{
    server->credits += server->echo_credits + server->oplock_credits;
    server->oplock_credits = server->echo_credits = 0;
    switch (server->credits) {
    case 0:
        return -1;
    case 1:
        server->echoes = false;
        server->oplocks = false;
        cERROR(1, "disabling echoes and oplocks");
        break;
    case 2:
        server->echoes = true;
        server->oplocks = false;
        server->echo_credits = 1;
        cFYI(1, "disabling oplocks");
        break;
    default:
        server->echoes = true;
        server->oplocks = true;
        server->echo_credits = 1;
        server->oplock_credits = 1;
    }
    server->credits -= server->echo_credits + server->oplock_credits;
    return 0;
}

static void
smb2_add_credits(struct TCP_Server_Info *server, const unsigned int add,
         const int optype)
{
    int *val, rc = 0;
    spin_lock(&server->req_lock);
    val = server->ops->get_credits_field(server, optype);
    *val += add;
    server->in_flight--;
    if (server->in_flight == 0 && (optype & CIFS_OP_MASK) != CIFS_NEG_OP)
        rc = change_conf(server);
    /*
     * Sometimes server returns 0 credits on oplock break ack - we need to
     * rebalance credits in this case.
     */
    else if (server->in_flight > 0 && server->oplock_credits == 0 &&
         server->oplocks) {
        if (server->credits > 1) {
            server->credits--;
            server->oplock_credits++;
        }
    }
    spin_unlock(&server->req_lock);
    wake_up(&server->request_q);
    if (rc)
        cifs_reconnect(server);
}

static void
smb2_set_credits(struct TCP_Server_Info *server, const int val)
{
    spin_lock(&server->req_lock);
    server->credits = val;
    spin_unlock(&server->req_lock);
}

static int *
smb2_get_credits_field(struct TCP_Server_Info *server, const int optype)
{
    switch (optype) {
    case CIFS_ECHO_OP:
        return &server->echo_credits;
    case CIFS_OBREAK_OP:
        return &server->oplock_credits;
    default:
        return &server->credits;
    }
}

static unsigned int
smb2_get_credits(struct mid_q_entry *mid)
{
    return le16_to_cpu(((struct smb2_hdr *)mid->resp_buf)->CreditRequest);
}

static __u64
smb2_get_next_mid(struct TCP_Server_Info *server)
{
    __u64 mid;
    /* for SMB2 we need the current value */
    spin_lock(&GlobalMid_Lock);
    mid = server->CurrentMid++;
    spin_unlock(&GlobalMid_Lock);
    return mid;
}

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

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

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

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

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

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

static unsigned int
smb2_negotiate_wsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
{
    struct TCP_Server_Info *server = tcon->ses->server;
    unsigned int wsize;

    /* start with specified wsize, or default */
    wsize = volume_info->wsize ? volume_info->wsize : CIFS_DEFAULT_IOSIZE;
    wsize = min_t(unsigned int, wsize, server->max_write);
    /*
     * limit write size to 2 ** 16, because we don't support multicredit
     * requests now.
     */
    wsize = min_t(unsigned int, wsize, 2 << 15);

    return wsize;
}

static unsigned int
smb2_negotiate_rsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
{
    struct TCP_Server_Info *server = tcon->ses->server;
    unsigned int rsize;

    /* start with specified rsize, or default */
    rsize = volume_info->rsize ? volume_info->rsize : CIFS_DEFAULT_IOSIZE;
    rsize = min_t(unsigned int, rsize, server->max_read);
    /*
     * limit write size to 2 ** 16, because we don't support multicredit
     * requests now.
     */
    rsize = min_t(unsigned int, rsize, 2 << 15);

    return rsize;
}

static int
smb2_is_path_accessible(const unsigned int xid, struct cifs_tcon *tcon,
            struct cifs_sb_info *cifs_sb, const char *full_path)
{
    int rc;
    __u64 persistent_fid, volatile_fid;
    __le16 *utf16_path;
    __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;

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

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

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

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

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

    smb2_data = kzalloc(sizeof(struct smb2_file_all_info) + MAX_NAME * 2,
                GFP_KERNEL);
    if (smb2_data == NULL)
        return -ENOMEM;

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

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

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

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

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

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

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

static void
smb2_set_fid(struct cifsFileInfo *cfile, struct cifs_fid *fid, __u32 oplock)
{
    struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
    cfile->fid.persistent_fid = fid->persistent_fid;
    cfile->fid.volatile_fid = fid->volatile_fid;
    smb2_set_oplock_level(cinode, oplock);
    cinode->can_cache_brlcks = cinode->clientCanCacheAll;
}

static void
smb2_close_file(const unsigned int xid, struct cifs_tcon *tcon,
        struct cifs_fid *fid)
{
    SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);
}

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

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

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


static int
smb2_sync_read(const unsigned int xid, struct cifsFileInfo *cfile,
           struct cifs_io_parms *parms, unsigned int *bytes_read,
           char **buf, int *buf_type)
{
    parms->persistent_fid = cfile->fid.persistent_fid;
    parms->volatile_fid = cfile->fid.volatile_fid;
    return SMB2_read(xid, parms, bytes_read, buf, buf_type);
}

static int
smb2_sync_write(const unsigned int xid, struct cifsFileInfo *cfile,
        struct cifs_io_parms *parms, unsigned int *written,
        struct kvec *iov, unsigned long nr_segs)
{

    parms->persistent_fid = cfile->fid.persistent_fid;
    parms->volatile_fid = cfile->fid.volatile_fid;
    return SMB2_write(xid, parms, written, iov, nr_segs);
}

static int
smb2_set_file_size(const unsigned int xid, struct cifs_tcon *tcon,
           struct cifsFileInfo *cfile, __u64 size, bool set_alloc)
{
    __le64 eof = cpu_to_le64(size);
    return SMB2_set_eof(xid, tcon, cfile->fid.persistent_fid,
                cfile->fid.volatile_fid, cfile->pid, &eof);
}

static int
smb2_query_dir_first(const unsigned int xid, struct cifs_tcon *tcon,
             const char *path, struct cifs_sb_info *cifs_sb,
             struct cifs_fid *fid, __u16 search_flags,
             struct cifs_search_info *srch_inf)
{
    __le16 *utf16_path;
    int rc;
    __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
    __u64 persistent_fid, volatile_fid;

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

    rc = SMB2_open(xid, tcon, utf16_path, &persistent_fid, &volatile_fid,
               FILE_READ_ATTRIBUTES | FILE_READ_DATA, FILE_OPEN, 0, 0,
               &oplock, NULL);
    kfree(utf16_path);
    if (rc) {
        cERROR(1, "open dir failed");
        return rc;
    }

    srch_inf->entries_in_buffer = 0;
    srch_inf->index_of_last_entry = 0;
    fid->persistent_fid = persistent_fid;
    fid->volatile_fid = volatile_fid;

    rc = SMB2_query_directory(xid, tcon, persistent_fid, volatile_fid, 0,
                  srch_inf);
    if (rc) {
        cERROR(1, "query directory failed");
        SMB2_close(xid, tcon, persistent_fid, volatile_fid);
    }
    return rc;
}

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

static int
smb2_close_dir(const unsigned int xid, struct cifs_tcon *tcon,
           struct cifs_fid *fid)
{
    return SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);
}

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

    if (hdr->Status != STATUS_PENDING)
        return false;

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

    return true;
}

static int
smb2_oplock_response(struct cifs_tcon *tcon, struct cifs_fid *fid,
             struct cifsInodeInfo *cinode)
{
    if (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LEASING)
        return SMB2_lease_break(0, tcon, cinode->lease_key,
                    smb2_get_lease_state(cinode));

    return SMB2_oplock_break(0, tcon, fid->persistent_fid,
                 fid->volatile_fid,
                 cinode->clientCanCacheRead ? 1 : 0);
}

static int
smb2_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
         struct kstatfs *buf)
{
    int rc;
    u64 persistent_fid, volatile_fid;
    __le16 srch_path = 0; /* Null - open root of share */
    u8 oplock = SMB2_OPLOCK_LEVEL_NONE;

    rc = SMB2_open(xid, tcon, &srch_path, &persistent_fid, &volatile_fid,
               FILE_READ_ATTRIBUTES, FILE_OPEN, 0, 0, &oplock, NULL);
    if (rc)
        return rc;
    buf->f_type = SMB2_MAGIC_NUMBER;
    rc = SMB2_QFS_info(xid, tcon, persistent_fid, volatile_fid, buf);
    SMB2_close(xid, tcon, persistent_fid, volatile_fid);
    return rc;
}

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

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

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

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

static void
smb2_new_lease_key(struct cifs_fid *fid)
{
    get_random_bytes(fid->lease_key, SMB2_LEASE_KEY_SIZE);
}

struct smb_version_operations smb21_operations = {
    .compare_fids = smb2_compare_fids,
    .setup_request = smb2_setup_request,
    .setup_async_request = smb2_setup_async_request,
    .check_receive = smb2_check_receive,
    .add_credits = smb2_add_credits,
    .set_credits = smb2_set_credits,
    .get_credits_field = smb2_get_credits_field,
    .get_credits = smb2_get_credits,
    .get_next_mid = smb2_get_next_mid,
    .read_data_offset = smb2_read_data_offset,
    .read_data_length = smb2_read_data_length,
    .map_error = map_smb2_to_linux_error,
    .find_mid = smb2_find_mid,
    .check_message = smb2_check_message,
    .dump_detail = smb2_dump_detail,
    .clear_stats = smb2_clear_stats,
    .print_stats = smb2_print_stats,
    .is_oplock_break = smb2_is_valid_oplock_break,
    .need_neg = smb2_need_neg,
    .negotiate = smb2_negotiate,
    .negotiate_wsize = smb2_negotiate_wsize,
    .negotiate_rsize = smb2_negotiate_rsize,
    .sess_setup = SMB2_sess_setup,
    .logoff = SMB2_logoff,
    .tree_connect = SMB2_tcon,
    .tree_disconnect = SMB2_tdis,
    .is_path_accessible = smb2_is_path_accessible,
    .can_echo = smb2_can_echo,
    .echo = SMB2_echo,
    .query_path_info = smb2_query_path_info,
    .get_srv_inum = smb2_get_srv_inum,
    .query_file_info = smb2_query_file_info,
    .set_path_size = smb2_set_path_size,
    .set_file_size = smb2_set_file_size,
    .set_file_info = smb2_set_file_info,
    .build_path_to_root = smb2_build_path_to_root,
    .mkdir = smb2_mkdir,
    .mkdir_setinfo = smb2_mkdir_setinfo,
    .rmdir = smb2_rmdir,
    .unlink = smb2_unlink,
    .rename = smb2_rename_path,
    .create_hardlink = smb2_create_hardlink,
    .open = smb2_open_file,
    .set_fid = smb2_set_fid,
    .close = smb2_close_file,
    .flush = smb2_flush_file,
    .async_readv = smb2_async_readv,
    .async_writev = smb2_async_writev,
    .sync_read = smb2_sync_read,
    .sync_write = smb2_sync_write,
    .query_dir_first = smb2_query_dir_first,
    .query_dir_next = smb2_query_dir_next,
    .close_dir = smb2_close_dir,
    .calc_smb_size = smb2_calc_size,
    .is_status_pending = smb2_is_status_pending,
    .oplock_response = smb2_oplock_response,
    .queryfs = smb2_queryfs,
    .mand_lock = smb2_mand_lock,
    .mand_unlock_range = smb2_unlock_range,
    .push_mand_locks = smb2_push_mandatory_locks,
    .get_lease_key = smb2_get_lease_key,
    .set_lease_key = smb2_set_lease_key,
    .new_lease_key = smb2_new_lease_key,
};

struct smb_version_values smb21_values = {
    .version_string = SMB21_VERSION_STRING,
    .protocol_id = SMB21_PROT_ID,
    .req_capabilities = 0, /* MBZ on negotiate req until SMB3 dialect */
    .large_lock_type = 0,
    .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
    .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
    .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
    .header_size = sizeof(struct smb2_hdr),
    .max_header_size = MAX_SMB2_HDR_SIZE,
    .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
    .lock_cmd = SMB2_LOCK,
    .cap_unix = 0,
    .cap_nt_find = SMB2_NT_FIND,
    .cap_large_files = SMB2_LARGE_FILES,
};

struct smb_version_values smb30_values = {
    .version_string = SMB30_VERSION_STRING,
    .protocol_id = SMB30_PROT_ID,
    .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU,
    .large_lock_type = 0,
    .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
    .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
    .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
    .header_size = sizeof(struct smb2_hdr),
    .max_header_size = MAX_SMB2_HDR_SIZE,
    .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
    .lock_cmd = SMB2_LOCK,
    .cap_unix = 0,
    .cap_nt_find = SMB2_NT_FIND,
    .cap_large_files = SMB2_LARGE_FILES,
};