smb1ops.c

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/*
 *  SMB1 (CIFS) 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 "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->fid.netfid == ob2->fid.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 unsigned int
cifs_negotiate_wsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
{
    __u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
    struct TCP_Server_Info *server = tcon->ses->server;
    unsigned int wsize;

    /* start with specified wsize, or default */
    if (volume_info->wsize)
        wsize = volume_info->wsize;
    else if (tcon->unix_ext && (unix_cap & CIFS_UNIX_LARGE_WRITE_CAP))
        wsize = CIFS_DEFAULT_IOSIZE;
    else
        wsize = CIFS_DEFAULT_NON_POSIX_WSIZE;

    /* can server support 24-bit write sizes? (via UNIX extensions) */
    if (!tcon->unix_ext || !(unix_cap & CIFS_UNIX_LARGE_WRITE_CAP))
        wsize = min_t(unsigned int, wsize, CIFS_MAX_RFC1002_WSIZE);

    /*
     * no CAP_LARGE_WRITE_X or is signing enabled without CAP_UNIX set?
     * Limit it to max buffer offered by the server, minus the size of the
     * WRITEX header, not including the 4 byte RFC1001 length.
     */
    if (!(server->capabilities & CAP_LARGE_WRITE_X) ||
        (!(server->capabilities & CAP_UNIX) &&
         (server->sec_mode & (SECMODE_SIGN_ENABLED|SECMODE_SIGN_REQUIRED))))
        wsize = min_t(unsigned int, wsize,
                server->maxBuf - sizeof(WRITE_REQ) + 4);

    /* hard limit of CIFS_MAX_WSIZE */
    wsize = min_t(unsigned int, wsize, CIFS_MAX_WSIZE);

    return wsize;
}

static unsigned int
cifs_negotiate_rsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
{
    __u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
    struct TCP_Server_Info *server = tcon->ses->server;
    unsigned int rsize, defsize;

    /*
     * Set default value...
     *
     * HACK alert! Ancient servers have very small buffers. Even though
     * MS-CIFS indicates that servers are only limited by the client's
     * bufsize for reads, testing against win98se shows that it throws
     * INVALID_PARAMETER errors if you try to request too large a read.
     * OS/2 just sends back short reads.
     *
     * If the server doesn't advertise CAP_LARGE_READ_X, then assume that
     * it can't handle a read request larger than its MaxBufferSize either.
     */
    if (tcon->unix_ext && (unix_cap & CIFS_UNIX_LARGE_READ_CAP))
        defsize = CIFS_DEFAULT_IOSIZE;
    else if (server->capabilities & CAP_LARGE_READ_X)
        defsize = CIFS_DEFAULT_NON_POSIX_RSIZE;
    else
        defsize = server->maxBuf - sizeof(READ_RSP);

    rsize = volume_info->rsize ? volume_info->rsize : defsize;

    /*
     * no CAP_LARGE_READ_X? Then MS-CIFS states that we must limit this to
     * the client's MaxBufferSize.
     */
    if (!(server->capabilities & CAP_LARGE_READ_X))
        rsize = min_t(unsigned int, CIFSMaxBufSize, rsize);

    /* hard limit of CIFS_MAX_RSIZE */
    rsize = min_t(unsigned int, rsize, CIFS_MAX_RSIZE);

    return rsize;
}

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 int
cifs_query_file_info(const unsigned int xid, struct cifs_tcon *tcon,
             struct cifs_fid *fid, FILE_ALL_INFO *data)
{
    return CIFSSMBQFileInfo(xid, tcon, fid->netfid, data);
}

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;
}

static int
cifs_open_file(const unsigned int xid, struct cifs_tcon *tcon, const char *path,
           int disposition, int desired_access, int create_options,
           struct cifs_fid *fid, __u32 *oplock, FILE_ALL_INFO *buf,
           struct cifs_sb_info *cifs_sb)
{
    if (!(tcon->ses->capabilities & CAP_NT_SMBS))
        return SMBLegacyOpen(xid, tcon, path, disposition,
                     desired_access, create_options,
                     &fid->netfid, oplock, buf,
                     cifs_sb->local_nls, cifs_sb->mnt_cifs_flags
                        & CIFS_MOUNT_MAP_SPECIAL_CHR);
    return CIFSSMBOpen(xid, tcon, path, disposition, desired_access,
               create_options, &fid->netfid, oplock, buf,
               cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
                        CIFS_MOUNT_MAP_SPECIAL_CHR);
}

static void
cifs_set_fid(struct cifsFileInfo *cfile, struct cifs_fid *fid, __u32 oplock)
{
    struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
    cfile->fid.netfid = fid->netfid;
    cifs_set_oplock_level(cinode, oplock);
    cinode->can_cache_brlcks = cinode->clientCanCacheAll;
}

static void
cifs_close_file(const unsigned int xid, struct cifs_tcon *tcon,
        struct cifs_fid *fid)
{
    CIFSSMBClose(xid, tcon, fid->netfid);
}

static int
cifs_flush_file(const unsigned int xid, struct cifs_tcon *tcon,
        struct cifs_fid *fid)
{
    return CIFSSMBFlush(xid, tcon, fid->netfid);
}

static int
cifs_sync_read(const unsigned int xid, struct cifsFileInfo *cfile,
           struct cifs_io_parms *parms, unsigned int *bytes_read,
           char **buf, int *buf_type)
{
    parms->netfid = cfile->fid.netfid;
    return CIFSSMBRead(xid, parms, bytes_read, buf, buf_type);
}

static int
cifs_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->netfid = cfile->fid.netfid;
    return CIFSSMBWrite2(xid, parms, written, iov, nr_segs);
}

static int
smb_set_file_info(struct inode *inode, const char *full_path,
          FILE_BASIC_INFO *buf, const unsigned int xid)
{
    int oplock = 0;
    int rc;
    __u16 netfid;
    __u32 netpid;
    struct cifsFileInfo *open_file;
    struct cifsInodeInfo *cinode = CIFS_I(inode);
    struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
    struct tcon_link *tlink = NULL;
    struct cifs_tcon *tcon;

    /* if the file is already open for write, just use that fileid */
    open_file = find_writable_file(cinode, true);
    if (open_file) {
        netfid = open_file->fid.netfid;
        netpid = open_file->pid;
        tcon = tlink_tcon(open_file->tlink);
        goto set_via_filehandle;
    }

    tlink = cifs_sb_tlink(cifs_sb);
    if (IS_ERR(tlink)) {
        rc = PTR_ERR(tlink);
        tlink = NULL;
        goto out;
    }
    tcon = tlink_tcon(tlink);

    /*
     * NT4 apparently returns success on this call, but it doesn't really
     * work.
     */
    if (!(tcon->ses->flags & CIFS_SES_NT4)) {
        rc = CIFSSMBSetPathInfo(xid, tcon, full_path, buf,
                    cifs_sb->local_nls,
                    cifs_sb->mnt_cifs_flags &
                        CIFS_MOUNT_MAP_SPECIAL_CHR);
        if (rc == 0) {
            cinode->cifsAttrs = le32_to_cpu(buf->Attributes);
            goto out;
        } else if (rc != -EOPNOTSUPP && rc != -EINVAL)
            goto out;
    }

    cFYI(1, "calling SetFileInfo since SetPathInfo for times not supported "
        "by this server");
    rc = CIFSSMBOpen(xid, tcon, full_path, FILE_OPEN,
             SYNCHRONIZE | FILE_WRITE_ATTRIBUTES, CREATE_NOT_DIR,
             &netfid, &oplock, NULL, cifs_sb->local_nls,
             cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);

    if (rc != 0) {
        if (rc == -EIO)
            rc = -EINVAL;
        goto out;
    }

    netpid = current->tgid;

set_via_filehandle:
    rc = CIFSSMBSetFileInfo(xid, tcon, buf, netfid, netpid);
    if (!rc)
        cinode->cifsAttrs = le32_to_cpu(buf->Attributes);

    if (open_file == NULL)
        CIFSSMBClose(xid, tcon, netfid);
    else
        cifsFileInfo_put(open_file);
out:
    if (tlink != NULL)
        cifs_put_tlink(tlink);
    return rc;
}

static int
cifs_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)
{
    return CIFSFindFirst(xid, tcon, path, cifs_sb,
                 &fid->netfid, search_flags, srch_inf, true);
}

static int
cifs_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 CIFSFindNext(xid, tcon, fid->netfid, search_flags, srch_inf);
}

static int
cifs_close_dir(const unsigned int xid, struct cifs_tcon *tcon,
           struct cifs_fid *fid)
{
    return CIFSFindClose(xid, tcon, fid->netfid);
}

static int
cifs_oplock_response(struct cifs_tcon *tcon, struct cifs_fid *fid,
             struct cifsInodeInfo *cinode)
{
    return CIFSSMBLock(0, tcon, fid->netfid, current->tgid, 0, 0, 0, 0,
               LOCKING_ANDX_OPLOCK_RELEASE, false,
               cinode->clientCanCacheRead ? 1 : 0);
}

static int
cifs_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
         struct kstatfs *buf)
{
    int rc = -EOPNOTSUPP;

    buf->f_type = CIFS_MAGIC_NUMBER;

    /*
     * We could add a second check for a QFS Unix capability bit
     */
    if ((tcon->ses->capabilities & CAP_UNIX) &&
        (CIFS_POSIX_EXTENSIONS & le64_to_cpu(tcon->fsUnixInfo.Capability)))
        rc = CIFSSMBQFSPosixInfo(xid, tcon, buf);

    /*
     * Only need to call the old QFSInfo if failed on newer one,
     * e.g. by OS/2.
     **/
    if (rc && (tcon->ses->capabilities & CAP_NT_SMBS))
        rc = CIFSSMBQFSInfo(xid, tcon, buf);

    /*
     * Some old Windows servers also do not support level 103, retry with
     * older level one if old server failed the previous call or we
     * bypassed it because we detected that this was an older LANMAN sess
     */
    if (rc)
        rc = SMBOldQFSInfo(xid, tcon, buf);
    return rc;
}

static int
cifs_mand_lock(const unsigned int xid, struct cifsFileInfo *cfile, __u64 offset,
           __u64 length, __u32 type, int lock, int unlock, bool wait)
{
    return CIFSSMBLock(xid, tlink_tcon(cfile->tlink), cfile->fid.netfid,
               current->tgid, length, offset, unlock, lock,
               (__u8)type, wait, 0);
}

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,
    .negotiate_wsize = cifs_negotiate_wsize,
    .negotiate_rsize = cifs_negotiate_rsize,
    .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,
    .query_file_info = cifs_query_file_info,
    .get_srv_inum = cifs_get_srv_inum,
    .set_path_size = CIFSSMBSetEOF,
    .set_file_size = CIFSSMBSetFileSize,
    .set_file_info = smb_set_file_info,
    .build_path_to_root = cifs_build_path_to_root,
    .echo = CIFSSMBEcho,
    .mkdir = CIFSSMBMkDir,
    .mkdir_setinfo = cifs_mkdir_setinfo,
    .rmdir = CIFSSMBRmDir,
    .unlink = CIFSSMBDelFile,
    .rename_pending_delete = cifs_rename_pending_delete,
    .rename = CIFSSMBRename,
    .create_hardlink = CIFSCreateHardLink,
    .open = cifs_open_file,
    .set_fid = cifs_set_fid,
    .close = cifs_close_file,
    .flush = cifs_flush_file,
    .async_readv = cifs_async_readv,
    .async_writev = cifs_async_writev,
    .sync_read = cifs_sync_read,
    .sync_write = cifs_sync_write,
    .query_dir_first = cifs_query_dir_first,
    .query_dir_next = cifs_query_dir_next,
    .close_dir = cifs_close_dir,
    .calc_smb_size = smbCalcSize,
    .oplock_response = cifs_oplock_response,
    .queryfs = cifs_queryfs,
    .mand_lock = cifs_mand_lock,
    .mand_unlock_range = cifs_unlock_range,
    .push_mand_locks = cifs_push_mandatory_locks,
};

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,
};