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proc.c

/*
 *  proc.c
 *
 *  Copyright (C) 1995, 1996 by Paal-Kr. Engstad and Volker Lendecke
 *  Copyright (C) 1997 by Volker Lendecke
 *
 *  Please add a note about your changes to smbfs in the ChangeLog file.
 */

#include <linux/types.h>
#include <linux/capability.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/stat.h>
#include <linux/fcntl.h>
#include <linux/dcache.h>
#include <linux/dirent.h>
#include <linux/nls.h>
#include <linux/smp_lock.h>
#include <linux/net.h>
#include <linux/vfs.h>
#include <linux/smb_fs.h>
#include <linux/smbno.h>
#include <linux/smb_mount.h>

#include <net/sock.h>

#include <asm/string.h>
#include <asm/div64.h>

#include "smb_debug.h"
#include "proto.h"
#include "request.h"


/* Features. Undefine if they cause problems, this should perhaps be a
   config option. */
#define SMBFS_POSIX_UNLINK 1

/* Allow smb_retry to be interrupted. */
#define SMB_RETRY_INTR

#define SMB_VWV(packet)  ((packet) + SMB_HEADER_LEN)
#define SMB_CMD(packet)  (*(packet+8))
#define SMB_WCT(packet)  (*(packet+SMB_HEADER_LEN - 1))

#define SMB_DIRINFO_SIZE 43
#define SMB_STATUS_SIZE  21

#define SMB_ST_BLKSIZE  (PAGE_SIZE)
#define SMB_ST_BLKSHIFT (PAGE_SHIFT)

static struct smb_ops smb_ops_core;
static struct smb_ops smb_ops_os2;
static struct smb_ops smb_ops_win95;
static struct smb_ops smb_ops_winNT;
static struct smb_ops smb_ops_unix;
static struct smb_ops smb_ops_null;

static void
smb_init_dirent(struct smb_sb_info *server, struct smb_fattr *fattr);
static void
smb_finish_dirent(struct smb_sb_info *server, struct smb_fattr *fattr);
static int
smb_proc_getattr_core(struct smb_sb_info *server, struct dentry *dir,
                  struct smb_fattr *fattr);
static int
smb_proc_getattr_ff(struct smb_sb_info *server, struct dentry *dentry,
                struct smb_fattr *fattr);
static int
smb_proc_setattr_core(struct smb_sb_info *server, struct dentry *dentry,
                  u16 attr);
static int
smb_proc_setattr_ext(struct smb_sb_info *server,
                 struct inode *inode, struct smb_fattr *fattr);
static int
smb_proc_query_cifsunix(struct smb_sb_info *server);
static void
install_ops(struct smb_ops *dst, struct smb_ops *src);


static void
str_upper(char *name, int len)
{
      while (len--)
      {
            if (*name >= 'a' && *name <= 'z')
                  *name -= ('a' - 'A');
            name++;
      }
}

#if 0
static void
str_lower(char *name, int len)
{
      while (len--)
      {
            if (*name >= 'A' && *name <= 'Z')
                  *name += ('a' - 'A');
            name++;
      }
}
#endif

/* reverse a string inline. This is used by the dircache walking routines */
static void reverse_string(char *buf, int len)
{
      char c;
      char *end = buf+len-1;

      while(buf < end) {
            c = *buf;
            *(buf++) = *end;
            *(end--) = c;
      }
}

/* no conversion, just a wrapper for memcpy. */
static int convert_memcpy(unsigned char *output, int olen,
                    const unsigned char *input, int ilen,
                    struct nls_table *nls_from,
                    struct nls_table *nls_to)
{
      if (olen < ilen)
            return -ENAMETOOLONG;
      memcpy(output, input, ilen);
      return ilen;
}

static inline int write_char(unsigned char ch, char *output, int olen)
{
      if (olen < 4)
            return -ENAMETOOLONG;
      sprintf(output, ":x%02x", ch);
      return 4;
}

static inline int write_unichar(wchar_t ch, char *output, int olen)
{
      if (olen < 5)
            return -ENAMETOOLONG;
      sprintf(output, ":%04x", ch);
      return 5;
}

/* convert from one "codepage" to another (possibly being utf8). */
static int convert_cp(unsigned char *output, int olen,
                  const unsigned char *input, int ilen,
                  struct nls_table *nls_from,
                  struct nls_table *nls_to)
{
      int len = 0;
      int n;
      wchar_t ch;

      while (ilen > 0) {
            /* convert by changing to unicode and back to the new cp */
            n = nls_from->char2uni(input, ilen, &ch);
            if (n == -EINVAL) {
                  ilen--;
                  n = write_char(*input++, output, olen);
                  if (n < 0)
                        goto fail;
                  output += n;
                  olen -= n;
                  len += n;
                  continue;
            } else if (n < 0)
                  goto fail;
            input += n;
            ilen -= n;

            n = nls_to->uni2char(ch, output, olen);
            if (n == -EINVAL)
                  n = write_unichar(ch, output, olen);
            if (n < 0)
                  goto fail;
            output += n;
            olen -= n;

            len += n;
      }
      return len;
fail:
      return n;
}

/* ----------------------------------------------------------- */

/*
 * nls_unicode
 *
 * This encodes/decodes little endian unicode format
 */

static int uni2char(wchar_t uni, unsigned char *out, int boundlen)
{
      if (boundlen < 2)
            return -EINVAL;
      *out++ = uni & 0xff;
      *out++ = uni >> 8;
      return 2;
}

static int char2uni(const unsigned char *rawstring, int boundlen, wchar_t *uni)
{
      if (boundlen < 2)
            return -EINVAL;
      *uni = (rawstring[1] << 8) | rawstring[0];
      return 2;
}

static struct nls_table unicode_table = {
      .charset    = "unicode",
      .uni2char   = uni2char,
      .char2uni   = char2uni,
};

/* ----------------------------------------------------------- */

static int setcodepage(struct nls_table **p, char *name)
{
      struct nls_table *nls;

      if (!name || !*name) {
            nls = NULL;
      } else if ( (nls = load_nls(name)) == NULL) {
            printk (KERN_ERR "smbfs: failed to load nls '%s'\n", name);
            return -EINVAL;
      }

      /* if already set, unload the previous one. */
      if (*p && *p != &unicode_table)
            unload_nls(*p);
      *p = nls;

      return 0;
}

/* Handles all changes to codepage settings. */
int smb_setcodepage(struct smb_sb_info *server, struct smb_nls_codepage *cp)
{
      int n = 0;

      smb_lock_server(server);

      /* Don't load any nls_* at all, if no remote is requested */
      if (!*cp->remote_name)
            goto out;

      /* local */
      n = setcodepage(&server->local_nls, cp->local_name);
      if (n != 0)
            goto out;

      /* remote */
      if (!strcmp(cp->remote_name, "unicode")) {
            server->remote_nls = &unicode_table;
      } else {
            n = setcodepage(&server->remote_nls, cp->remote_name);
            if (n != 0)
                  setcodepage(&server->local_nls, NULL);
      }

out:
      if (server->local_nls != NULL && server->remote_nls != NULL)
            server->ops->convert = convert_cp;
      else
            server->ops->convert = convert_memcpy;

      smb_unlock_server(server);
      return n;
}


/*****************************************************************************/
/*                                                                           */
/*  Encoding/Decoding section                                                */
/*                                                                           */
/*****************************************************************************/

static __u8 *
smb_encode_smb_length(__u8 * p, __u32 len)
{
      *p = 0;
      *(p+1) = 0;
      *(p+2) = (len & 0xFF00) >> 8;
      *(p+3) = (len & 0xFF);
      if (len > 0xFFFF)
      {
            *(p+1) = 1;
      }
      return p + 4;
}

/*
 * smb_build_path: build the path to entry and name storing it in buf.
 * The path returned will have the trailing '\0'.
 */
static int smb_build_path(struct smb_sb_info *server, unsigned char *buf,
                    int maxlen,
                    struct dentry *entry, struct qstr *name)
{
      unsigned char *path = buf;
      int len;
      int unicode = (server->mnt->flags & SMB_MOUNT_UNICODE) != 0;

      if (maxlen < (2<<unicode))
            return -ENAMETOOLONG;

      if (maxlen > SMB_MAXPATHLEN + 1)
            maxlen = SMB_MAXPATHLEN + 1;

      if (entry == NULL)
            goto test_name_and_out;

      /*
       * If IS_ROOT, we have to do no walking at all.
       */
      if (IS_ROOT(entry) && !name) {
            *path++ = '\\';
            if (unicode) *path++ = '\0';
            *path++ = '\0';
            if (unicode) *path++ = '\0';
            return path-buf;
      }

      /*
       * Build the path string walking the tree backward from end to ROOT
       * and store it in reversed order [see reverse_string()]
       */
      dget(entry);
      spin_lock(&entry->d_lock);
      while (!IS_ROOT(entry)) {
            struct dentry *parent;

            if (maxlen < (3<<unicode)) {
                  spin_unlock(&entry->d_lock);
                  dput(entry);
                  return -ENAMETOOLONG;
            }

            len = server->ops->convert(path, maxlen-2, 
                              entry->d_name.name, entry->d_name.len,
                              server->local_nls, server->remote_nls);
            if (len < 0) {
                  spin_unlock(&entry->d_lock);
                  dput(entry);
                  return len;
            }
            reverse_string(path, len);
            path += len;
            if (unicode) {
                  /* Note: reverse order */
                  *path++ = '\0';
                  maxlen--;
            }
            *path++ = '\\';
            maxlen -= len+1;

            parent = entry->d_parent;
            dget(parent);
            spin_unlock(&entry->d_lock);
            dput(entry);
            entry = parent;
            spin_lock(&entry->d_lock);
      }
      spin_unlock(&entry->d_lock);
      dput(entry);
      reverse_string(buf, path-buf);

      /* maxlen has space for at least one char */
test_name_and_out:
      if (name) {
            if (maxlen < (3<<unicode))
                  return -ENAMETOOLONG;
            *path++ = '\\';
            if (unicode) {
                  *path++ = '\0';
                  maxlen--;
            }
            len = server->ops->convert(path, maxlen-2, 
                              name->name, name->len,
                              server->local_nls, server->remote_nls);
            if (len < 0)
                  return len;
            path += len;
            maxlen -= len+1;
      }
      /* maxlen has space for at least one char */
      *path++ = '\0';
      if (unicode) *path++ = '\0';
      return path-buf;
}

static int smb_encode_path(struct smb_sb_info *server, char *buf, int maxlen,
                     struct dentry *dir, struct qstr *name)
{
      int result;

      result = smb_build_path(server, buf, maxlen, dir, name);
      if (result < 0)
            goto out;
      if (server->opt.protocol <= SMB_PROTOCOL_COREPLUS)
            str_upper(buf, result);
out:
      return result;
}

/* encode_path for non-trans2 request SMBs */
static int smb_simple_encode_path(struct smb_request *req, char **p,
                          struct dentry * entry, struct qstr * name)
{
      struct smb_sb_info *server = req->rq_server;
      char *s = *p;
      int res;
      int maxlen = ((char *)req->rq_buffer + req->rq_bufsize) - s;
      int unicode = (server->mnt->flags & SMB_MOUNT_UNICODE);

      if (!maxlen)
            return -ENAMETOOLONG;
      *s++ = 4;   /* ASCII data format */

      /*
       * SMB Unicode strings must be 16bit aligned relative the start of the
       * packet. If they are not they must be padded with 0.
       */
      if (unicode) {
            int align = s - (char *)req->rq_buffer;
            if (!(align & 1)) {
                  *s++ = '\0';
                  maxlen--;
            }
      }

      res = smb_encode_path(server, s, maxlen-1, entry, name);
      if (res < 0)
            return res;
      *p = s + res;
      return 0;
}

/* The following are taken directly from msdos-fs */

/* Linear day numbers of the respective 1sts in non-leap years. */

static int day_n[] =
{0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 0, 0, 0, 0};
              /* JanFebMarApr May Jun Jul Aug Sep Oct Nov Dec */


static time_t
utc2local(struct smb_sb_info *server, time_t time)
{
      return time - server->opt.serverzone*60;
}

static time_t
local2utc(struct smb_sb_info *server, time_t time)
{
      return time + server->opt.serverzone*60;
}

/* Convert a MS-DOS time/date pair to a UNIX date (seconds since 1 1 70). */

static time_t
date_dos2unix(struct smb_sb_info *server, __u16 date, __u16 time)
{
      int month, year;
      time_t secs;

      /* first subtract and mask after that... Otherwise, if
         date == 0, bad things happen */
      month = ((date >> 5) - 1) & 15;
      year = date >> 9;
      secs = (time & 31) * 2 + 60 * ((time >> 5) & 63) + (time >> 11) * 3600 + 86400 *
          ((date & 31) - 1 + day_n[month] + (year / 4) + year * 365 - ((year & 3) == 0 &&
                                       month < 2 ? 1 : 0) + 3653);
      /* days since 1.1.70 plus 80's leap day */
      return local2utc(server, secs);
}


/* Convert linear UNIX date to a MS-DOS time/date pair. */

static void
date_unix2dos(struct smb_sb_info *server,
            int unix_date, __u16 *date, __u16 *time)
{
      int day, year, nl_day, month;

      unix_date = utc2local(server, unix_date);
      if (unix_date < 315532800)
            unix_date = 315532800;

      *time = (unix_date % 60) / 2 +
            (((unix_date / 60) % 60) << 5) +
            (((unix_date / 3600) % 24) << 11);

      day = unix_date / 86400 - 3652;
      year = day / 365;
      if ((year + 3) / 4 + 365 * year > day)
            year--;
      day -= (year + 3) / 4 + 365 * year;
      if (day == 59 && !(year & 3)) {
            nl_day = day;
            month = 2;
      } else {
            nl_day = (year & 3) || day <= 59 ? day : day - 1;
            for (month = 0; month < 12; month++)
                  if (day_n[month] > nl_day)
                        break;
      }
      *date = nl_day - day_n[month - 1] + 1 + (month << 5) + (year << 9);
}

/* The following are taken from fs/ntfs/util.c */

#define NTFS_TIME_OFFSET ((u64)(369*365 + 89) * 24 * 3600 * 10000000)

/*
 * Convert the NT UTC (based 1601-01-01, in hundred nanosecond units)
 * into Unix UTC (based 1970-01-01, in seconds).
 */
static struct timespec
smb_ntutc2unixutc(u64 ntutc)
{
      struct timespec ts;
      /* FIXME: what about the timezone difference? */
      /* Subtract the NTFS time offset, then convert to 1s intervals. */
      u64 t = ntutc - NTFS_TIME_OFFSET;
      ts.tv_nsec = do_div(t, 10000000) * 100;
      ts.tv_sec = t; 
      return ts;
}

/* Convert the Unix UTC into NT time */
static u64
smb_unixutc2ntutc(struct timespec ts)
{
      /* Note: timezone conversion is probably wrong. */
      /* return ((u64)utc2local(server, t)) * 10000000 + NTFS_TIME_OFFSET; */
      return ((u64)ts.tv_sec) * 10000000 + ts.tv_nsec/100 + NTFS_TIME_OFFSET;
}

#define MAX_FILE_MODE   6
static mode_t file_mode[] = {
      S_IFREG, S_IFDIR, S_IFLNK, S_IFCHR, S_IFBLK, S_IFIFO, S_IFSOCK
};

static int smb_filetype_to_mode(u32 filetype)
{
      if (filetype > MAX_FILE_MODE) {
            PARANOIA("Filetype out of range: %d\n", filetype);
            return S_IFREG;
      }
      return file_mode[filetype];
}

static u32 smb_filetype_from_mode(int mode)
{
      if (S_ISREG(mode))
            return UNIX_TYPE_FILE;
      if (S_ISDIR(mode))
            return UNIX_TYPE_DIR;
      if (S_ISLNK(mode))
            return UNIX_TYPE_SYMLINK;
      if (S_ISCHR(mode))
            return UNIX_TYPE_CHARDEV;
      if (S_ISBLK(mode))
            return UNIX_TYPE_BLKDEV;
      if (S_ISFIFO(mode))
            return UNIX_TYPE_FIFO;
      if (S_ISSOCK(mode))
            return UNIX_TYPE_SOCKET;
      return UNIX_TYPE_UNKNOWN;
}


/*****************************************************************************/
/*                                                                           */
/*  Support section.                                                         */
/*                                                                           */
/*****************************************************************************/

__u32
smb_len(__u8 * p)
{
      return ((*(p+1) & 0x1) << 16L) | (*(p+2) << 8L) | *(p+3);
}

static __u16
smb_bcc(__u8 * packet)
{
      int pos = SMB_HEADER_LEN + SMB_WCT(packet) * sizeof(__u16);
      return WVAL(packet, pos);
}

/* smb_valid_packet: We check if packet fulfills the basic
   requirements of a smb packet */

static int
smb_valid_packet(__u8 * packet)
{
      return (packet[4] == 0xff
            && packet[5] == 'S'
            && packet[6] == 'M'
            && packet[7] == 'B'
            && (smb_len(packet) + 4 == SMB_HEADER_LEN
                + SMB_WCT(packet) * 2 + smb_bcc(packet)));
}

/* smb_verify: We check if we got the answer we expected, and if we
   got enough data. If bcc == -1, we don't care. */

static int
smb_verify(__u8 * packet, int command, int wct, int bcc)
{
      if (SMB_CMD(packet) != command)
            goto bad_command;
      if (SMB_WCT(packet) < wct)
            goto bad_wct;
      if (bcc != -1 && smb_bcc(packet) < bcc)
            goto bad_bcc;
      return 0;

bad_command:
      printk(KERN_ERR "smb_verify: command=%x, SMB_CMD=%x??\n",
             command, SMB_CMD(packet));
      goto fail;
bad_wct:
      printk(KERN_ERR "smb_verify: command=%x, wct=%d, SMB_WCT=%d??\n",
             command, wct, SMB_WCT(packet));
      goto fail;
bad_bcc:
      printk(KERN_ERR "smb_verify: command=%x, bcc=%d, SMB_BCC=%d??\n",
             command, bcc, smb_bcc(packet));
fail:
      return -EIO;
}

/*
 * Returns the maximum read or write size for the "payload". Making all of the
 * packet fit within the negotiated max_xmit size.
 *
 * N.B. Since this value is usually computed before locking the server,
 * the server's packet size must never be decreased!
 */
static inline int
smb_get_xmitsize(struct smb_sb_info *server, int overhead)
{
      return server->opt.max_xmit - overhead;
}

/*
 * Calculate the maximum read size
 */
int
smb_get_rsize(struct smb_sb_info *server)
{
      /* readX has 12 parameters, read has 5 */
      int overhead = SMB_HEADER_LEN + 12 * sizeof(__u16) + 2 + 1 + 2;
      int size = smb_get_xmitsize(server, overhead);

      VERBOSE("xmit=%d, size=%d\n", server->opt.max_xmit, size);

      return size;
}

/*
 * Calculate the maximum write size
 */
int
smb_get_wsize(struct smb_sb_info *server)
{
      /* writeX has 14 parameters, write has 5 */
      int overhead = SMB_HEADER_LEN + 14 * sizeof(__u16) + 2 + 1 + 2;
      int size = smb_get_xmitsize(server, overhead);

      VERBOSE("xmit=%d, size=%d\n", server->opt.max_xmit, size);

      return size;
}

/*
 * Convert SMB error codes to -E... errno values.
 */
int
smb_errno(struct smb_request *req)
{
      int errcls = req->rq_rcls;
      int error  = req->rq_err;
      char *class = "Unknown";

      VERBOSE("errcls %d  code %d  from command 0x%x\n",
            errcls, error, SMB_CMD(req->rq_header));

      if (errcls == ERRDOS) {
            switch (error) {
            case ERRbadfunc:
                  return -EINVAL;
            case ERRbadfile:
            case ERRbadpath:
                  return -ENOENT;
            case ERRnofids:
                  return -EMFILE;
            case ERRnoaccess:
                  return -EACCES;
            case ERRbadfid:
                  return -EBADF;
            case ERRbadmcb:
                  return -EREMOTEIO;
            case ERRnomem:
                  return -ENOMEM;
            case ERRbadmem:
                  return -EFAULT;
            case ERRbadenv:
            case ERRbadformat:
                  return -EREMOTEIO;
            case ERRbadaccess:
                  return -EACCES;
            case ERRbaddata:
                  return -E2BIG;
            case ERRbaddrive:
                  return -ENXIO;
            case ERRremcd:
                  return -EREMOTEIO;
            case ERRdiffdevice:
                  return -EXDEV;
            case ERRnofiles:
                  return -ENOENT;
            case ERRbadshare:
                  return -ETXTBSY;
            case ERRlock:
                  return -EDEADLK;
            case ERRfilexists:
                  return -EEXIST;
            case ERROR_INVALID_PARAMETER:
                  return -EINVAL;
            case ERROR_DISK_FULL:
                  return -ENOSPC;
            case ERROR_INVALID_NAME:
                  return -ENOENT;
            case ERROR_DIR_NOT_EMPTY:
                  return -ENOTEMPTY;
            case ERROR_NOT_LOCKED:
                       return -ENOLCK;
            case ERROR_ALREADY_EXISTS:
                  return -EEXIST;
            default:
                  class = "ERRDOS";
                  goto err_unknown;
            }
      } else if (errcls == ERRSRV) {
            switch (error) {
            /* N.B. This is wrong ... EIO ? */
            case ERRerror:
                  return -ENFILE;
            case ERRbadpw:
                  return -EINVAL;
            case ERRbadtype:
            case ERRtimeout:
                  return -EIO;
            case ERRaccess:
                  return -EACCES;
            /*
             * This is a fatal error, as it means the "tree ID"
             * for this connection is no longer valid. We map
             * to a special error code and get a new connection.
             */
            case ERRinvnid:
                  return -EBADSLT;
            default:
                  class = "ERRSRV";
                  goto err_unknown;
            }
      } else if (errcls == ERRHRD) {
            switch (error) {
            case ERRnowrite:
                  return -EROFS;
            case ERRbadunit:
                  return -ENODEV;
            case ERRnotready:
                  return -EUCLEAN;
            case ERRbadcmd:
            case ERRdata:
                  return -EIO;
            case ERRbadreq:
                  return -ERANGE;
            case ERRbadshare:
                  return -ETXTBSY;
            case ERRlock:
                  return -EDEADLK;
            case ERRdiskfull:
                  return -ENOSPC;
            default:
                  class = "ERRHRD";
                  goto err_unknown;
            }
      } else if (errcls == ERRCMD) {
            class = "ERRCMD";
      } else if (errcls == SUCCESS) {
            return 0;   /* This is the only valid 0 return */
      }

err_unknown:
      printk(KERN_ERR "smb_errno: class %s, code %d from command 0x%x\n",
             class, error, SMB_CMD(req->rq_header));
      return -EIO;
}

/* smb_request_ok: We expect the server to be locked. Then we do the
   request and check the answer completely. When smb_request_ok
   returns 0, you can be quite sure that everything went well. When
   the answer is <=0, the returned number is a valid unix errno. */

static int
smb_request_ok(struct smb_request *req, int command, int wct, int bcc)
{
      int result;

      req->rq_resp_wct = wct;
      req->rq_resp_bcc = bcc;

      result = smb_add_request(req);
      if (result != 0) {
            DEBUG1("smb_request failed\n");
            goto out;
      }

      if (smb_valid_packet(req->rq_header) != 0) {
            PARANOIA("invalid packet!\n");
            goto out;
      }

      result = smb_verify(req->rq_header, command, wct, bcc);

out:
      return result;
}

/*
 * This implements the NEWCONN ioctl. It installs the server pid,
 * sets server->state to CONN_VALID, and wakes up the waiting process.
 */
int
smb_newconn(struct smb_sb_info *server, struct smb_conn_opt *opt)
{
      struct file *filp;
      struct sock *sk;
      int error;

      VERBOSE("fd=%d, pid=%d\n", opt->fd, current->pid);

      smb_lock_server(server);

      /*
       * Make sure we don't already have a valid connection ...
       */
      error = -EINVAL;
      if (server->state == CONN_VALID)
            goto out;

      error = -EACCES;
      if (current->uid != server->mnt->mounted_uid && 
          !capable(CAP_SYS_ADMIN))
            goto out;

      error = -EBADF;
      filp = fget(opt->fd);
      if (!filp)
            goto out;
      if (!smb_valid_socket(filp->f_path.dentry->d_inode))
            goto out_putf;

      server->sock_file = filp;
      server->conn_pid = get_pid(task_pid(current));
      server->opt = *opt;
      server->generation += 1;
      server->state = CONN_VALID;
      error = 0;

      if (server->conn_error) {
            /*
             * conn_error is the returncode we originally decided to
             * drop the old connection on. This message should be positive
             * and not make people ask questions on why smbfs is printing
             * error messages ...
             */
            printk(KERN_INFO "SMB connection re-established (%d)\n",
                   server->conn_error);
            server->conn_error = 0;
      }

      /*
       * Store the server in sock user_data (Only used by sunrpc)
       */
      sk = SOCKET_I(filp->f_path.dentry->d_inode)->sk;
      sk->sk_user_data = server;

      /* chain into the data_ready callback */
      server->data_ready = xchg(&sk->sk_data_ready, smb_data_ready);

      /* check if we have an old smbmount that uses seconds for the 
         serverzone */
      if (server->opt.serverzone > 12*60 || server->opt.serverzone < -12*60)
            server->opt.serverzone /= 60;

      /* now that we have an established connection we can detect the server
         type and enable bug workarounds */
      if (server->opt.protocol < SMB_PROTOCOL_LANMAN2)
            install_ops(server->ops, &smb_ops_core);
      else if (server->opt.protocol == SMB_PROTOCOL_LANMAN2)
            install_ops(server->ops, &smb_ops_os2);
      else if (server->opt.protocol == SMB_PROTOCOL_NT1 &&
             (server->opt.max_xmit < 0x1000) &&
             !(server->opt.capabilities & SMB_CAP_NT_SMBS)) {
            /* FIXME: can we kill the WIN95 flag now? */
            server->mnt->flags |= SMB_MOUNT_WIN95;
            VERBOSE("detected WIN95 server\n");
            install_ops(server->ops, &smb_ops_win95);
      } else {
            /*
             * Samba has max_xmit 65535
             * NT4spX has max_xmit 4536 (or something like that)
             * win2k has ...
             */
            VERBOSE("detected NT1 (Samba, NT4/5) server\n");
            install_ops(server->ops, &smb_ops_winNT);
      }

      /* FIXME: the win9x code wants to modify these ... (seek/trunc bug) */
      if (server->mnt->flags & SMB_MOUNT_OLDATTR) {
            server->ops->getattr = smb_proc_getattr_core;
      } else if (server->mnt->flags & SMB_MOUNT_DIRATTR) {
            server->ops->getattr = smb_proc_getattr_ff;
      }

      /* Decode server capabilities */
      if (server->opt.capabilities & SMB_CAP_LARGE_FILES) {
            /* Should be ok to set this now, as no one can access the
               mount until the connection has been established. */
            SB_of(server)->s_maxbytes = ~0ULL >> 1;
            VERBOSE("LFS enabled\n");
      }
      if (server->opt.capabilities & SMB_CAP_UNICODE) {
            server->mnt->flags |= SMB_MOUNT_UNICODE;
            VERBOSE("Unicode enabled\n");
      } else {
            server->mnt->flags &= ~SMB_MOUNT_UNICODE;
      }
#if 0
      /* flags we may test for other patches ... */
      if (server->opt.capabilities & SMB_CAP_LARGE_READX) {
            VERBOSE("Large reads enabled\n");
      }
      if (server->opt.capabilities & SMB_CAP_LARGE_WRITEX) {
            VERBOSE("Large writes enabled\n");
      }
#endif
      if (server->opt.capabilities & SMB_CAP_UNIX) {
            struct inode *inode;
            VERBOSE("Using UNIX CIFS extensions\n");
            install_ops(server->ops, &smb_ops_unix);
            inode = SB_of(server)->s_root->d_inode;
            if (inode)
                  inode->i_op = &smb_dir_inode_operations_unix;
      }

      VERBOSE("protocol=%d, max_xmit=%d, pid=%d capabilities=0x%x\n",
            server->opt.protocol, server->opt.max_xmit,
            pid_nr(server->conn_pid), server->opt.capabilities);

      /* FIXME: this really should be done by smbmount. */
      if (server->opt.max_xmit > SMB_MAX_PACKET_SIZE) {
            server->opt.max_xmit = SMB_MAX_PACKET_SIZE;
      }

      smb_unlock_server(server);
      smbiod_wake_up();
      if (server->opt.capabilities & SMB_CAP_UNIX)
            smb_proc_query_cifsunix(server);

      server->conn_complete++;
      wake_up_interruptible_all(&server->conn_wq);
      return error;

out:
      smb_unlock_server(server);
      smbiod_wake_up();
      return error;

out_putf:
      fput(filp);
      goto out;
}

/* smb_setup_header: We completely set up the packet. You only have to
   insert the command-specific fields */

__u8 *
smb_setup_header(struct smb_request *req, __u8 command, __u16 wct, __u16 bcc)
{
      __u32 xmit_len = SMB_HEADER_LEN + wct * sizeof(__u16) + bcc + 2;
      __u8 *p = req->rq_header;
      struct smb_sb_info *server = req->rq_server;

      p = smb_encode_smb_length(p, xmit_len - 4);

      *p++ = 0xff;
      *p++ = 'S';
      *p++ = 'M';
      *p++ = 'B';
      *p++ = command;

      memset(p, '\0', 19);
      p += 19;
      p += 8;

      if (server->opt.protocol > SMB_PROTOCOL_CORE) {
            int flags = SMB_FLAGS_CASELESS_PATHNAMES;
            int flags2 = SMB_FLAGS2_LONG_PATH_COMPONENTS |
                  SMB_FLAGS2_EXTENDED_ATTRIBUTES;     /* EA? not really ... */

            *(req->rq_header + smb_flg) = flags;
            if (server->mnt->flags & SMB_MOUNT_UNICODE)
                  flags2 |= SMB_FLAGS2_UNICODE_STRINGS;
            WSET(req->rq_header, smb_flg2, flags2);
      }
      *p++ = wct;       /* wct */
      p += 2 * wct;
      WSET(p, 0, bcc);

      /* Include the header in the data to send */
      req->rq_iovlen = 1;
      req->rq_iov[0].iov_base = req->rq_header;
      req->rq_iov[0].iov_len  = xmit_len - bcc;

      return req->rq_buffer;
}

static void
smb_setup_bcc(struct smb_request *req, __u8 *p)
{
      u16 bcc = p - req->rq_buffer;
      u8 *pbcc = req->rq_header + SMB_HEADER_LEN + 2*SMB_WCT(req->rq_header);

      WSET(pbcc, 0, bcc);

      smb_encode_smb_length(req->rq_header, SMB_HEADER_LEN + 
                        2*SMB_WCT(req->rq_header) - 2 + bcc);

      /* Include the "bytes" in the data to send */
      req->rq_iovlen = 2;
      req->rq_iov[1].iov_base = req->rq_buffer;
      req->rq_iov[1].iov_len  = bcc;
}

static int
smb_proc_seek(struct smb_sb_info *server, __u16 fileid,
            __u16 mode, off_t offset)
{
      int result;
      struct smb_request *req;

      result = -ENOMEM;
      if (! (req = smb_alloc_request(server, 0)))
            goto out;

      smb_setup_header(req, SMBlseek, 4, 0);
      WSET(req->rq_header, smb_vwv0, fileid);
      WSET(req->rq_header, smb_vwv1, mode);
      DSET(req->rq_header, smb_vwv2, offset);
      req->rq_flags |= SMB_REQ_NORETRY;

      result = smb_request_ok(req, SMBlseek, 2, 0);
      if (result < 0) {
            result = 0;
            goto out_free;
      }

      result = DVAL(req->rq_header, smb_vwv0);
out_free:
      smb_rput(req);
out:
      return result;
}

static int
smb_proc_open(struct smb_sb_info *server, struct dentry *dentry, int wish)
{
      struct inode *ino = dentry->d_inode;
      struct smb_inode_info *ei = SMB_I(ino);
      int mode, read_write = 0x42, read_only = 0x40;
      int res;
      char *p;
      struct smb_request *req;

      /*
       * Attempt to open r/w, unless there are no write privileges.
       */
      mode = read_write;
      if (!(ino->i_mode & (S_IWUSR | S_IWGRP | S_IWOTH)))
            mode = read_only;
#if 0
      /* FIXME: why is this code not in? below we fix it so that a caller
         wanting RO doesn't get RW. smb_revalidate_inode does some 
         optimization based on access mode. tail -f needs it to be correct.

         We must open rw since we don't do the open if called a second time
         with different 'wish'. Is that not supported by smb servers? */
      if (!(wish & (O_WRONLY | O_RDWR)))
            mode = read_only;
#endif

      res = -ENOMEM;
      if (! (req = smb_alloc_request(server, PAGE_SIZE)))
            goto out;

      retry:
      p = smb_setup_header(req, SMBopen, 2, 0);
      WSET(req->rq_header, smb_vwv0, mode);
      WSET(req->rq_header, smb_vwv1, aSYSTEM | aHIDDEN | aDIR);
      res = smb_simple_encode_path(req, &p, dentry, NULL);
      if (res < 0)
            goto out_free;
      smb_setup_bcc(req, p);

      res = smb_request_ok(req, SMBopen, 7, 0);
      if (res != 0) {
            if (mode == read_write &&
                (res == -EACCES || res == -ETXTBSY || res == -EROFS))
            {
                  VERBOSE("%s/%s R/W failed, error=%d, retrying R/O\n",
                        DENTRY_PATH(dentry), res);
                  mode = read_only;
                  req->rq_flags = 0;
                  goto retry;
            }
            goto out_free;
      }
      /* We should now have data in vwv[0..6]. */

      ei->fileid = WVAL(req->rq_header, smb_vwv0);
      ei->attr   = WVAL(req->rq_header, smb_vwv1);
      /* smb_vwv2 has mtime */
      /* smb_vwv4 has size  */
      ei->access = (WVAL(req->rq_header, smb_vwv6) & SMB_ACCMASK);
      ei->open = server->generation;

out_free:
      smb_rput(req);
out:
      return res;
}

/*
 * Make sure the file is open, and check that the access
 * is compatible with the desired access.
 */
int
smb_open(struct dentry *dentry, int wish)
{
      struct inode *inode = dentry->d_inode;
      int result;
      __u16 access;

      result = -ENOENT;
      if (!inode) {
            printk(KERN_ERR "smb_open: no inode for dentry %s/%s\n",
                   DENTRY_PATH(dentry));
            goto out;
      }

      if (!smb_is_open(inode)) {
            struct smb_sb_info *server = server_from_inode(inode);
            result = 0;
            if (!smb_is_open(inode))
                  result = smb_proc_open(server, dentry, wish);
            if (result)
                  goto out;
            /*
             * A successful open means the path is still valid ...
             */
            smb_renew_times(dentry);
      }

      /*
       * Check whether the access is compatible with the desired mode.
       */
      result = 0;
      access = SMB_I(inode)->access;
      if (access != wish && access != SMB_O_RDWR) {
            PARANOIA("%s/%s access denied, access=%x, wish=%x\n",
                   DENTRY_PATH(dentry), access, wish);
            result = -EACCES;
      }
out:
      return result;
}

static int 
smb_proc_close(struct smb_sb_info *server, __u16 fileid, __u32 mtime)
{
      struct smb_request *req;
      int result = -ENOMEM;

      if (! (req = smb_alloc_request(server, 0)))
            goto out;

      smb_setup_header(req, SMBclose, 3, 0);
      WSET(req->rq_header, smb_vwv0, fileid);
      DSET(req->rq_header, smb_vwv1, utc2local(server, mtime));
      req->rq_flags |= SMB_REQ_NORETRY;
      result = smb_request_ok(req, SMBclose, 0, 0);

      smb_rput(req);
out:
      return result;
}

/*
 * Win NT 4.0 has an apparent bug in that it fails to update the
 * modify time when writing to a file. As a workaround, we update
 * both modify and access time locally, and post the times to the
 * server when closing the file.
 */
static int 
smb_proc_close_inode(struct smb_sb_info *server, struct inode * ino)
{
      struct smb_inode_info *ei = SMB_I(ino);
      int result = 0;
      if (smb_is_open(ino))
      {
            /*
             * We clear the open flag in advance, in case another
             * process observes the value while we block below.
             */
            ei->open = 0;

            /*
             * Kludge alert: SMB timestamps are accurate only to
             * two seconds ... round the times to avoid needless
             * cache invalidations!
             */
            if (ino->i_mtime.tv_sec & 1) { 
                  ino->i_mtime.tv_sec--;
                  ino->i_mtime.tv_nsec = 0; 
            }
            if (ino->i_atime.tv_sec & 1) {
                  ino->i_atime.tv_sec--;
                  ino->i_atime.tv_nsec = 0;
            }
            /*
             * If the file is open with write permissions,
             * update the time stamps to sync mtime and atime.
             */
            if ((server->opt.capabilities & SMB_CAP_UNIX) == 0 &&
                (server->opt.protocol >= SMB_PROTOCOL_LANMAN2) &&
                !(ei->access == SMB_O_RDONLY))
            {
                  struct smb_fattr fattr;
                  smb_get_inode_attr(ino, &fattr);
                  smb_proc_setattr_ext(server, ino, &fattr);
            }

            result = smb_proc_close(server, ei->fileid, ino->i_mtime.tv_sec);
            /*
             * Force a revalidation after closing ... some servers
             * don't post the size until the file has been closed.
             */
            if (server->opt.protocol < SMB_PROTOCOL_NT1)
                  ei->oldmtime = 0;
            ei->closed = jiffies;
      }
      return result;
}

int
smb_close(struct inode *ino)
{
      int result = 0;

      if (smb_is_open(ino)) {
            struct smb_sb_info *server = server_from_inode(ino);
            result = smb_proc_close_inode(server, ino);
      }
      return result;
}

/*
 * This is used to close a file following a failed instantiate.
 * Since we don't have an inode, we can't use any of the above.
 */
int
smb_close_fileid(struct dentry *dentry, __u16 fileid)
{
      struct smb_sb_info *server = server_from_dentry(dentry);
      int result;

      result = smb_proc_close(server, fileid, get_seconds());
      return result;
}

/* In smb_proc_read and smb_proc_write we do not retry, because the
   file-id would not be valid after a reconnection. */

static void
smb_proc_read_data(struct smb_request *req)
{
      req->rq_iov[0].iov_base = req->rq_buffer;
      req->rq_iov[0].iov_len  = 3;

      req->rq_iov[1].iov_base = req->rq_page;
      req->rq_iov[1].iov_len  = req->rq_rsize;
      req->rq_iovlen = 2;

      req->rq_rlen = smb_len(req->rq_header) + 4 - req->rq_bytes_recvd;
}

static int
smb_proc_read(struct inode *inode, loff_t offset, int count, char *data)
{
      struct smb_sb_info *server = server_from_inode(inode);
      __u16 returned_count, data_len;
      unsigned char *buf;
      int result;
      struct smb_request *req;
      u8 rbuf[4];

      result = -ENOMEM;
      if (! (req = smb_alloc_request(server, 0)))
            goto out;

      smb_setup_header(req, SMBread, 5, 0);
      buf = req->rq_header;
      WSET(buf, smb_vwv0, SMB_I(inode)->fileid);
      WSET(buf, smb_vwv1, count);
      DSET(buf, smb_vwv2, offset);
      WSET(buf, smb_vwv4, 0);

      req->rq_page = data;
      req->rq_rsize = count;
      req->rq_callback = smb_proc_read_data;
      req->rq_buffer = rbuf;
      req->rq_flags |= SMB_REQ_NORETRY | SMB_REQ_STATIC;

      result = smb_request_ok(req, SMBread, 5, -1);
      if (result < 0)
            goto out_free;
      returned_count = WVAL(req->rq_header, smb_vwv0);

      data_len = WVAL(rbuf, 1);

      if (returned_count != data_len) {
            printk(KERN_NOTICE "smb_proc_read: returned != data_len\n");
            printk(KERN_NOTICE "smb_proc_read: ret_c=%d, data_len=%d\n",
                   returned_count, data_len);
      }
      result = data_len;

out_free:
      smb_rput(req);
out:
      VERBOSE("ino=%ld, fileid=%d, count=%d, result=%d\n",
            inode->i_ino, SMB_I(inode)->fileid, count, result);
      return result;
}

static int
smb_proc_write(struct inode *inode, loff_t offset, int count, const char *data)
{
      struct smb_sb_info *server = server_from_inode(inode);
      int result;
      u16 fileid = SMB_I(inode)->fileid;
      u8 buf[4];
      struct smb_request *req;

      result = -ENOMEM;
      if (! (req = smb_alloc_request(server, 0)))
            goto out;

      VERBOSE("ino=%ld, fileid=%d, count=%d@%Ld\n",
            inode->i_ino, fileid, count, offset);

      smb_setup_header(req, SMBwrite, 5, count + 3);
      WSET(req->rq_header, smb_vwv0, fileid);
      WSET(req->rq_header, smb_vwv1, count);
      DSET(req->rq_header, smb_vwv2, offset);
      WSET(req->rq_header, smb_vwv4, 0);

      buf[0] = 1;
      WSET(buf, 1, count);    /* yes, again ... */
      req->rq_iov[1].iov_base = buf;
      req->rq_iov[1].iov_len = 3;
      req->rq_iov[2].iov_base = (char *) data;
      req->rq_iov[2].iov_len = count;
      req->rq_iovlen = 3;
      req->rq_flags |= SMB_REQ_NORETRY;

      result = smb_request_ok(req, SMBwrite, 1, 0);
      if (result >= 0)
            result = WVAL(req->rq_header, smb_vwv0);

      smb_rput(req);
out:
      return result;
}

/*
 * In smb_proc_readX and smb_proc_writeX we do not retry, because the
 * file-id would not be valid after a reconnection.
 */

#define SMB_READX_MAX_PAD      64
static void
smb_proc_readX_data(struct smb_request *req)
{
      /* header length, excluding the netbios length (-4) */
      int hdrlen = SMB_HEADER_LEN + req->rq_resp_wct*2 - 2;
      int data_off = WVAL(req->rq_header, smb_vwv6);

      /*
       * Some genius made the padding to the data bytes arbitrary.
       * So we must first calculate the amount of padding used by the server.
       */
      data_off -= hdrlen;
      if (data_off > SMB_READX_MAX_PAD || data_off < 0) {
            PARANOIA("offset is larger than SMB_READX_MAX_PAD or negative!\n");
            PARANOIA("%d > %d || %d < 0\n", data_off, SMB_READX_MAX_PAD, data_off);
            req->rq_rlen = req->rq_bufsize + 1;
            return;
      }
      req->rq_iov[0].iov_base = req->rq_buffer;
      req->rq_iov[0].iov_len  = data_off;

      req->rq_iov[1].iov_base = req->rq_page;
      req->rq_iov[1].iov_len  = req->rq_rsize;
      req->rq_iovlen = 2;

      req->rq_rlen = smb_len(req->rq_header) + 4 - req->rq_bytes_recvd;
}

static int
smb_proc_readX(struct inode *inode, loff_t offset, int count, char *data)
{
      struct smb_sb_info *server = server_from_inode(inode);
      unsigned char *buf;
      int result;
      struct smb_request *req;
      static char pad[SMB_READX_MAX_PAD];

      result = -ENOMEM;
      if (! (req = smb_alloc_request(server, 0)))
            goto out;

      smb_setup_header(req, SMBreadX, 12, 0);
      buf = req->rq_header;
      WSET(buf, smb_vwv0, 0x00ff);
      WSET(buf, smb_vwv1, 0);
      WSET(buf, smb_vwv2, SMB_I(inode)->fileid);
      DSET(buf, smb_vwv3, (u32)offset);               /* low 32 bits */
      WSET(buf, smb_vwv5, count);
      WSET(buf, smb_vwv6, 0);
      DSET(buf, smb_vwv7, 0);
      WSET(buf, smb_vwv9, 0);
      DSET(buf, smb_vwv10, (u32)(offset >> 32));      /* high 32 bits */
      WSET(buf, smb_vwv11, 0);

      req->rq_page = data;
      req->rq_rsize = count;
      req->rq_callback = smb_proc_readX_data;
      req->rq_buffer = pad;
      req->rq_bufsize = SMB_READX_MAX_PAD;
      req->rq_flags |= SMB_REQ_STATIC | SMB_REQ_NORETRY;

      result = smb_request_ok(req, SMBreadX, 12, -1);
      if (result < 0)
            goto out_free;
      result = WVAL(req->rq_header, smb_vwv5);

out_free:
      smb_rput(req);
out:
      VERBOSE("ino=%ld, fileid=%d, count=%d, result=%d\n",
            inode->i_ino, SMB_I(inode)->fileid, count, result);
      return result;
}

static int
smb_proc_writeX(struct inode *inode, loff_t offset, int count, const char *data)
{
      struct smb_sb_info *server = server_from_inode(inode);
      int result;
      u8 *p;
      static u8 pad[4];
      struct smb_request *req;

      result = -ENOMEM;
      if (! (req = smb_alloc_request(server, 0)))
            goto out;

      VERBOSE("ino=%ld, fileid=%d, count=%d@%Ld\n",
            inode->i_ino, SMB_I(inode)->fileid, count, offset);

      p = smb_setup_header(req, SMBwriteX, 14, count + 1);
      WSET(req->rq_header, smb_vwv0, 0x00ff);
      WSET(req->rq_header, smb_vwv1, 0);
      WSET(req->rq_header, smb_vwv2, SMB_I(inode)->fileid);
      DSET(req->rq_header, smb_vwv3, (u32)offset);    /* low 32 bits */
      DSET(req->rq_header, smb_vwv5, 0);
      WSET(req->rq_header, smb_vwv7, 0);        /* write mode */
      WSET(req->rq_header, smb_vwv8, 0);
      WSET(req->rq_header, smb_vwv9, 0);
      WSET(req->rq_header, smb_vwv10, count);         /* data length */
      WSET(req->rq_header, smb_vwv11, smb_vwv12 + 2 + 1);
      DSET(req->rq_header, smb_vwv12, (u32)(offset >> 32));

      req->rq_iov[1].iov_base = pad;
      req->rq_iov[1].iov_len = 1;
      req->rq_iov[2].iov_base = (char *) data;
      req->rq_iov[2].iov_len = count;
      req->rq_iovlen = 3;
      req->rq_flags |= SMB_REQ_NORETRY;

      result = smb_request_ok(req, SMBwriteX, 6, 0);
      if (result >= 0)
            result = WVAL(req->rq_header, smb_vwv2);

      smb_rput(req);
out:
      return result;
}

int
smb_proc_create(struct dentry *dentry, __u16 attr, time_t ctime, __u16 *fileid)
{
      struct smb_sb_info *server = server_from_dentry(dentry);
      char *p;
      int result;
      struct smb_request *req;

      result = -ENOMEM;
      if (! (req = smb_alloc_request(server, PAGE_SIZE)))
            goto out;

      p = smb_setup_header(req, SMBcreate, 3, 0);
      WSET(req->rq_header, smb_vwv0, attr);
      DSET(req->rq_header, smb_vwv1, utc2local(server, ctime));
      result = smb_simple_encode_path(req, &p, dentry, NULL);
      if (result < 0)
            goto out_free;
      smb_setup_bcc(req, p);

      result = smb_request_ok(req, SMBcreate, 1, 0);
      if (result < 0)
            goto out_free;

      *fileid = WVAL(req->rq_header, smb_vwv0);
      result = 0;

out_free:
      smb_rput(req);
out:
      return result;
}

int
smb_proc_mv(struct dentry *old_dentry, struct dentry *new_dentry)
{
      struct smb_sb_info *server = server_from_dentry(old_dentry);
      char *p;
      int result;
      struct smb_request *req;

      result = -ENOMEM;
      if (! (req = smb_alloc_request(server, PAGE_SIZE)))
            goto out;

      p = smb_setup_header(req, SMBmv, 1, 0);
      WSET(req->rq_header, smb_vwv0, aSYSTEM | aHIDDEN | aDIR);
      result = smb_simple_encode_path(req, &p, old_dentry, NULL);
      if (result < 0)
            goto out_free;
      result = smb_simple_encode_path(req, &p, new_dentry, NULL);
      if (result < 0)
            goto out_free;
      smb_setup_bcc(req, p);

      if ((result = smb_request_ok(req, SMBmv, 0, 0)) < 0)
            goto out_free;
      result = 0;

out_free:
      smb_rput(req);
out:
      return result;
}

/*
 * Code common to mkdir and rmdir.
 */
static int
smb_proc_generic_command(struct dentry *dentry, __u8 command)
{
      struct smb_sb_info *server = server_from_dentry(dentry);
      char *p;
      int result;
      struct smb_request *req;

      result = -ENOMEM;
      if (! (req = smb_alloc_request(server, PAGE_SIZE)))
            goto out;

      p = smb_setup_header(req, command, 0, 0);
      result = smb_simple_encode_path(req, &p, dentry, NULL);
      if (result < 0)
            goto out_free;
      smb_setup_bcc(req, p);

      result = smb_request_ok(req, command, 0, 0);
      if (result < 0)
            goto out_free;
      result = 0;

out_free:
      smb_rput(req);
out:
      return result;
}

int
smb_proc_mkdir(struct dentry *dentry)
{
      return smb_proc_generic_command(dentry, SMBmkdir);
}

int
smb_proc_rmdir(struct dentry *dentry)
{
      return smb_proc_generic_command(dentry, SMBrmdir);
}

#if SMBFS_POSIX_UNLINK
/*
 * Removes readonly attribute from a file. Used by unlink to give posix
 * semantics.
 */
static int
smb_set_rw(struct dentry *dentry,struct smb_sb_info *server)
{
      int result;
      struct smb_fattr fattr;

      /* FIXME: cifsUE should allow removing a readonly file. */

      /* first get current attribute */
      smb_init_dirent(server, &fattr);
      result = server->ops->getattr(server, dentry, &fattr);
      smb_finish_dirent(server, &fattr);
      if (result < 0)
            return result;

      /* if RONLY attribute is set, remove it */
      if (fattr.attr & aRONLY) {  /* read only attribute is set */
            fattr.attr &= ~aRONLY;
            result = smb_proc_setattr_core(server, dentry, fattr.attr);
      }
      return result;
}
#endif

int
smb_proc_unlink(struct dentry *dentry)
{
      struct smb_sb_info *server = server_from_dentry(dentry);
      int flag = 0;
      char *p;
      int result;
      struct smb_request *req;

      result = -ENOMEM;
      if (! (req = smb_alloc_request(server, PAGE_SIZE)))
            goto out;

      retry:
      p = smb_setup_header(req, SMBunlink, 1, 0);
      WSET(req->rq_header, smb_vwv0, aSYSTEM | aHIDDEN);
      result = smb_simple_encode_path(req, &p, dentry, NULL);
      if (result < 0)
            goto out_free;
      smb_setup_bcc(req, p);

      if ((result = smb_request_ok(req, SMBunlink, 0, 0)) < 0) {
#if SMBFS_POSIX_UNLINK
            if (result == -EACCES && !flag) {
                  /* Posix semantics is for the read-only state
                     of a file to be ignored in unlink(). In the
                     SMB world a unlink() is refused on a
                     read-only file. To make things easier for
                     unix users we try to override the files
                     permission if the unlink fails with the
                     right error.
                     This introduces a race condition that could
                     lead to a file being written by someone who
                     shouldn't have access, but as far as I can
                     tell that is unavoidable */

                  /* remove RONLY attribute and try again */
                  result = smb_set_rw(dentry,server);
                  if (result == 0) {
                        flag = 1;
                        req->rq_flags = 0;
                        goto retry;
                  }
            }
#endif
            goto out_free;
      }
      result = 0;

out_free:
      smb_rput(req);
out:
      return result;
}

int
smb_proc_flush(struct smb_sb_info *server, __u16 fileid)
{
      int result;
      struct smb_request *req;

      result = -ENOMEM;
      if (! (req = smb_alloc_request(server, 0)))
            goto out;

      smb_setup_header(req, SMBflush, 1, 0);
      WSET(req->rq_header, smb_vwv0, fileid);
      req->rq_flags |= SMB_REQ_NORETRY;
      result = smb_request_ok(req, SMBflush, 0, 0);

      smb_rput(req);
out:
      return result;
}

static int
smb_proc_trunc32(struct inode *inode, loff_t length)
{
      /*
       * Writing 0bytes is old-SMB magic for truncating files.
       * MAX_NON_LFS should prevent this from being called with a too
       * large offset.
       */
      return smb_proc_write(inode, length, 0, NULL);
}

static int
smb_proc_trunc64(struct inode *inode, loff_t length)
{
      struct smb_sb_info *server = server_from_inode(inode);
      int result;
      char *param;
      char *data;
      struct smb_request *req;

      result = -ENOMEM;
      if (! (req = smb_alloc_request(server, 14)))
            goto out;

      param = req->rq_buffer;
      data = req->rq_buffer + 6;

      /* FIXME: must we also set allocation size? winNT seems to do that */
      WSET(param, 0, SMB_I(inode)->fileid);
      WSET(param, 2, SMB_SET_FILE_END_OF_FILE_INFO);
      WSET(param, 4, 0);
      LSET(data, 0, length);

      req->rq_trans2_command = TRANSACT2_SETFILEINFO;
      req->rq_ldata = 8;
      req->rq_data  = data;
      req->rq_lparm = 6;
      req->rq_parm  = param;
      req->rq_flags |= SMB_REQ_NORETRY;
      result = smb_add_request(req);
      if (result < 0)
            goto out_free;

      result = 0;
      if (req->rq_rcls != 0)
            result = smb_errno(req);

out_free:
      smb_rput(req);
out:
      return result;
}

static int
smb_proc_trunc95(struct inode *inode, loff_t length)
{
      struct smb_sb_info *server = server_from_inode(inode);
      int result = smb_proc_trunc32(inode, length);
 
      /*
       * win9x doesn't appear to update the size immediately.
       * It will return the old file size after the truncate,
       * confusing smbfs. So we force an update.
       *
       * FIXME: is this still necessary?
       */
      smb_proc_flush(server, SMB_I(inode)->fileid);
      return result;
}

static void
smb_init_dirent(struct smb_sb_info *server, struct smb_fattr *fattr)
{
      memset(fattr, 0, sizeof(*fattr));

      fattr->f_nlink = 1;
      fattr->f_uid = server->mnt->uid;
      fattr->f_gid = server->mnt->gid;
      fattr->f_unix = 0;
}

static void
smb_finish_dirent(struct smb_sb_info *server, struct smb_fattr *fattr)
{
      if (fattr->f_unix)
            return;

      fattr->f_mode = server->mnt->file_mode;
      if (fattr->attr & aDIR) {
            fattr->f_mode = server->mnt->dir_mode;
            fattr->f_size = SMB_ST_BLKSIZE;
      }
      /* Check the read-only flag */
      if (fattr->attr & aRONLY)
            fattr->f_mode &= ~(S_IWUSR | S_IWGRP | S_IWOTH);

      /* How many 512 byte blocks do we need for this file? */
      fattr->f_blocks = 0;
      if (fattr->f_size != 0)
            fattr->f_blocks = 1 + ((fattr->f_size-1) >> 9);
      return;
}

void
smb_init_root_dirent(struct smb_sb_info *server, struct smb_fattr *fattr,
                 struct super_block *sb)
{
      smb_init_dirent(server, fattr);
      fattr->attr = aDIR;
      fattr->f_ino = 2; /* traditional root inode number */
      fattr->f_mtime = current_fs_time(sb);
      smb_finish_dirent(server, fattr);
}

/*
 * Decode a dirent for old protocols
 *
 * qname is filled with the decoded, and possibly translated, name.
 * fattr receives decoded attributes
 *
 * Bugs Noted:
 * (1) Pathworks servers may pad the name with extra spaces.
 */
static char *
smb_decode_short_dirent(struct smb_sb_info *server, char *p,
                  struct qstr *qname, struct smb_fattr *fattr,
                  unsigned char *name_buf)
{
      int len;

      /*
       * SMB doesn't have a concept of inode numbers ...
       */
      smb_init_dirent(server, fattr);
      fattr->f_ino = 0; /* FIXME: do we need this? */

      p += SMB_STATUS_SIZE;   /* reserved (search_status) */
      fattr->attr = *p;
      fattr->f_mtime.tv_sec = date_dos2unix(server, WVAL(p, 3), WVAL(p, 1));
      fattr->f_mtime.tv_nsec = 0;
      fattr->f_size = DVAL(p, 5);
      fattr->f_ctime = fattr->f_mtime;
      fattr->f_atime = fattr->f_mtime;
      qname->name = p + 9;
      len = strnlen(qname->name, 12);

      /*
       * Trim trailing blanks for Pathworks servers
       */
      while (len > 2 && qname->name[len-1] == ' ')
            len--;

      smb_finish_dirent(server, fattr);

#if 0
      /* FIXME: These only work for ascii chars, and recent smbmount doesn't
         allow the flag to be set anyway. It kills const. Remove? */
      switch (server->opt.case_handling) {
      case SMB_CASE_UPPER:
            str_upper(entry->name, len);
            break;
      case SMB_CASE_LOWER:
            str_lower(entry->name, len);
            break;
      default:
            break;
      }
#endif

      qname->len = 0;
      len = server->ops->convert(name_buf, SMB_MAXNAMELEN,
                           qname->name, len,
                           server->remote_nls, server->local_nls);
      if (len > 0) {
            qname->len = len;
            qname->name = name_buf;
            DEBUG1("len=%d, name=%.*s\n",qname->len,qname->len,qname->name);
      }

      return p + 22;
}

/*
 * This routine is used to read in directory entries from the network.
 * Note that it is for short directory name seeks, i.e.: protocol <
 * SMB_PROTOCOL_LANMAN2
 */
static int
smb_proc_readdir_short(struct file *filp, void *dirent, filldir_t filldir,
                   struct smb_cache_control *ctl)
{
      struct dentry *dir = filp->f_path.dentry;
      struct smb_sb_info *server = server_from_dentry(dir);
      struct qstr qname;
      struct smb_fattr fattr;
      char *p;
      int result;
      int i, first, entries_seen, entries;
      int entries_asked = (server->opt.max_xmit - 100) / SMB_DIRINFO_SIZE;
      __u16 bcc;
      __u16 count;
      char status[SMB_STATUS_SIZE];
      static struct qstr mask = {
            .name = "*.*",
            .len  = 3,
      };
      unsigned char *last_status;
      struct smb_request *req;
      unsigned char *name_buf;

      VERBOSE("%s/%s\n", DENTRY_PATH(dir));

      lock_kernel();

      result = -ENOMEM;
      if (! (name_buf = kmalloc(SMB_MAXNAMELEN, GFP_KERNEL)))
            goto out;

      first = 1;
      entries = 0;
      entries_seen = 2; /* implicit . and .. */

      result = -ENOMEM;
      if (! (req = smb_alloc_request(server, server->opt.max_xmit)))
            goto out_name;

      while (1) {
            p = smb_setup_header(req, SMBsearch, 2, 0);
            WSET(req->rq_header, smb_vwv0, entries_asked);
            WSET(req->rq_header, smb_vwv1, aDIR);
            if (first == 1) {
                  result = smb_simple_encode_path(req, &p, dir, &mask);
                  if (result < 0)
                        goto out_free;
                  if (p + 3 > (char *)req->rq_buffer + req->rq_bufsize) {
                        result = -ENAMETOOLONG;
                        goto out_free;
                  }
                  *p++ = 5;
                  WSET(p, 0, 0);
                  p += 2;
                  first = 0;
            } else {
                  if (p + 5 + SMB_STATUS_SIZE >
                      (char *)req->rq_buffer + req->rq_bufsize) {
                        result = -ENAMETOOLONG;
                        goto out_free;
                  }
                        
                  *p++ = 4;
                  *p++ = 0;
                  *p++ = 5;
                  WSET(p, 0, SMB_STATUS_SIZE);
                  p += 2;
                  memcpy(p, status, SMB_STATUS_SIZE);
                  p += SMB_STATUS_SIZE;
            }

            smb_setup_bcc(req, p);

            result = smb_request_ok(req, SMBsearch, 1, -1);
            if (result < 0) {
                  if ((req->rq_rcls == ERRDOS) && 
                      (req->rq_err  == ERRnofiles))
                        break;
                  goto out_free;
            }
            count = WVAL(req->rq_header, smb_vwv0);
            if (count <= 0)
                  break;

            result = -EIO;
            bcc = smb_bcc(req->rq_header);
            if (bcc != count * SMB_DIRINFO_SIZE + 3)
                  goto out_free;
            p = req->rq_buffer + 3;


            /* Make sure the response fits in the buffer. Fixed sized 
               entries means we don't have to check in the decode loop. */

            last_status = req->rq_buffer + 3 + (count-1) * SMB_DIRINFO_SIZE;

            if (last_status + SMB_DIRINFO_SIZE >=
                req->rq_buffer + req->rq_bufsize) {
                  printk(KERN_ERR "smb_proc_readdir_short: "
                         "last dir entry outside buffer! "
                         "%d@%p  %d@%p\n", SMB_DIRINFO_SIZE, last_status,
                         req->rq_bufsize, req->rq_buffer);
                  goto out_free;
            }

            /* Read the last entry into the status field. */
            memcpy(status, last_status, SMB_STATUS_SIZE);


            /* Now we are ready to parse smb directory entries. */

            for (i = 0; i < count; i++) {
                  p = smb_decode_short_dirent(server, p, 
                                        &qname, &fattr, name_buf);
                  if (qname.len == 0)
                        continue;

                  if (entries_seen == 2 && qname.name[0] == '.') {
                        if (qname.len == 1)
                              continue;
                        if (qname.name[1] == '.' && qname.len == 2)
                              continue;
                  }
                  if (!smb_fill_cache(filp, dirent, filldir, ctl, 
                                  &qname, &fattr))
                        ;     /* stop reading? */
                  entries_seen++;
            }
      }
      result = entries;

out_free:
      smb_rput(req);
out_name:
      kfree(name_buf);
out:
      unlock_kernel();
      return result;
}

static void smb_decode_unix_basic(struct smb_fattr *fattr, struct smb_sb_info *server, char *p)
{
      u64 size, disk_bytes;

      /* FIXME: verify nls support. all is sent as utf8? */

      fattr->f_unix = 1;
      fattr->f_mode = 0;

      /* FIXME: use the uniqueID from the remote instead? */
      /* 0 L file size in bytes */
      /* 8 L file size on disk in bytes (block count) */
      /* 40 L uid */
      /* 48 L gid */
      /* 56 W file type */
      /* 60 L devmajor */
      /* 68 L devminor */
      /* 76 L unique ID (inode) */
      /* 84 L permissions */
      /* 92 L link count */

      size = LVAL(p, 0);
      disk_bytes = LVAL(p, 8);

      /*
       * Some samba versions round up on-disk byte usage
       * to 1MB boundaries, making it useless. When seeing
       * that, use the size instead.
       */
      if (!(disk_bytes & 0xfffff))
            disk_bytes = size+511;

      fattr->f_size = size;
      fattr->f_blocks = disk_bytes >> 9;
      fattr->f_ctime = smb_ntutc2unixutc(LVAL(p, 16));
      fattr->f_atime = smb_ntutc2unixutc(LVAL(p, 24));
      fattr->f_mtime = smb_ntutc2unixutc(LVAL(p, 32));

      if (server->mnt->flags & SMB_MOUNT_UID)
            fattr->f_uid = server->mnt->uid;
      else
            fattr->f_uid = LVAL(p, 40);

      if (server->mnt->flags & SMB_MOUNT_GID)
            fattr->f_gid = server->mnt->gid;
      else
            fattr->f_gid = LVAL(p, 48);

      fattr->f_mode |= smb_filetype_to_mode(WVAL(p, 56));

      if (S_ISBLK(fattr->f_mode) || S_ISCHR(fattr->f_mode)) {
            __u64 major = LVAL(p, 60);
            __u64 minor = LVAL(p, 68);

            fattr->f_rdev = MKDEV(major & 0xffffffff, minor & 0xffffffff);
            if (MAJOR(fattr->f_rdev) != (major & 0xffffffff) ||
            MINOR(fattr->f_rdev) != (minor & 0xffffffff))
                  fattr->f_rdev = 0;
      }

      fattr->f_mode |= LVAL(p, 84);

      if ( (server->mnt->flags & SMB_MOUNT_DMODE) &&
           (S_ISDIR(fattr->f_mode)) )
            fattr->f_mode = (server->mnt->dir_mode & S_IRWXUGO) | S_IFDIR;
      else if ( (server->mnt->flags & SMB_MOUNT_FMODE) &&
                !(S_ISDIR(fattr->f_mode)) )
            fattr->f_mode = (server->mnt->file_mode & S_IRWXUGO) |
                        (fattr->f_mode & S_IFMT);

}

/*
 * Interpret a long filename structure using the specified info level:
 *   level 1 for anything below NT1 protocol
 *   level 260 for NT1 protocol
 *
 * qname is filled with the decoded, and possibly translated, name
 * fattr receives decoded attributes.
 *
 * Bugs Noted:
 * (1) Win NT 4.0 appends a null byte to names and counts it in the length!
 */
static char *
smb_decode_long_dirent(struct smb_sb_info *server, char *p, int level,
                   struct qstr *qname, struct smb_fattr *fattr,
                   unsigned char *name_buf)
{
      char *result;
      unsigned int len = 0;
      int n;
      __u16 date, time;
      int unicode = (server->mnt->flags & SMB_MOUNT_UNICODE);

      /*
       * SMB doesn't have a concept of inode numbers ...
       */
      smb_init_dirent(server, fattr);
      fattr->f_ino = 0; /* FIXME: do we need this? */

      switch (level) {
      case 1:
            len = *((unsigned char *) p + 22);
            qname->name = p + 23;
            result = p + 24 + len;

            date = WVAL(p, 0);
            time = WVAL(p, 2);
            fattr->f_ctime.tv_sec = date_dos2unix(server, date, time);
            fattr->f_ctime.tv_nsec = 0;

            date = WVAL(p, 4);
            time = WVAL(p, 6);
            fattr->f_atime.tv_sec = date_dos2unix(server, date, time);
            fattr->f_atime.tv_nsec = 0;

            date = WVAL(p, 8);
            time = WVAL(p, 10);
            fattr->f_mtime.tv_sec = date_dos2unix(server, date, time);
            fattr->f_mtime.tv_nsec = 0;
            fattr->f_size = DVAL(p, 12);
            /* ULONG allocation size */
            fattr->attr = WVAL(p, 20);

            VERBOSE("info 1 at %p, len=%d, name=%.*s\n",
                  p, len, len, qname->name);
            break;
      case 260:
            result = p + WVAL(p, 0);
            len = DVAL(p, 60);
            if (len > 255) len = 255;
            /* NT4 null terminates, unless we are using unicode ... */
            qname->name = p + 94;
            if (!unicode && len && qname->name[len-1] == '\0')
                  len--;

            fattr->f_ctime = smb_ntutc2unixutc(LVAL(p, 8));
            fattr->f_atime = smb_ntutc2unixutc(LVAL(p, 16));
            fattr->f_mtime = smb_ntutc2unixutc(LVAL(p, 24));
            /* change time (32) */
            fattr->f_size = LVAL(p, 40);
            /* alloc size (48) */
            fattr->attr = DVAL(p, 56);

            VERBOSE("info 260 at %p, len=%d, name=%.*s\n",
                  p, len, len, qname->name);
            break;
      case SMB_FIND_FILE_UNIX:
            result = p + WVAL(p, 0);
            qname->name = p + 108;

            len = strlen(qname->name);
            /* FIXME: should we check the length?? */

            p += 8;
            smb_decode_unix_basic(fattr, server, p);
            VERBOSE("info SMB_FIND_FILE_UNIX at %p, len=%d, name=%.*s\n",
                  p, len, len, qname->name);
            break;
      default:
            PARANOIA("Unknown info level %d\n", level);
            result = p + WVAL(p, 0);
            goto out;
      }

      smb_finish_dirent(server, fattr);

#if 0
      /* FIXME: These only work for ascii chars, and recent smbmount doesn't
         allow the flag to be set anyway. Remove? */
      switch (server->opt.case_handling) {
      case SMB_CASE_UPPER:
            str_upper(qname->name, len);
            break;
      case SMB_CASE_LOWER:
            str_lower(qname->name, len);
            break;
      default:
            break;
      }
#endif

      qname->len = 0;
      n = server->ops->convert(name_buf, SMB_MAXNAMELEN,
                         qname->name, len,
                         server->remote_nls, server->local_nls);
      if (n > 0) {
            qname->len = n;
            qname->name = name_buf;
      }

out:
      return result;
}

/* findfirst/findnext flags */
#define SMB_CLOSE_AFTER_FIRST (1<<0)
#define SMB_CLOSE_IF_END (1<<1)
#define SMB_REQUIRE_RESUME_KEY (1<<2)
#define SMB_CONTINUE_BIT (1<<3)

/*
 * Note: samba-2.0.7 (at least) has a very similar routine, cli_list, in
 * source/libsmb/clilist.c. When looking for smb bugs in the readdir code,
 * go there for advise.
 *
 * Bugs Noted:
 * (1) When using Info Level 1 Win NT 4.0 truncates directory listings 
 * for certain patterns of names and/or lengths. The breakage pattern
 * is completely reproducible and can be toggled by the creation of a
 * single file. (E.g. echo hi >foo breaks, rm -f foo works.)
 */
static int
smb_proc_readdir_long(struct file *filp, void *dirent, filldir_t filldir,
                  struct smb_cache_control *ctl)
{
      struct dentry *dir = filp->f_path.dentry;
      struct smb_sb_info *server = server_from_dentry(dir);
      struct qstr qname;
      struct smb_fattr fattr;

      unsigned char *p, *lastname;
      char *mask, *param;
      __u16 command;
      int first, entries_seen;

      /* Both NT and OS/2 accept info level 1 (but see note below). */
      int info_level = 260;
      const int max_matches = 512;

      unsigned int ff_searchcount = 0;
      unsigned int ff_eos = 0;
      unsigned int ff_lastname = 0;
      unsigned int ff_dir_handle = 0;
      unsigned int loop_count = 0;
      unsigned int mask_len, i;
      int result;
      struct smb_request *req;
      unsigned char *name_buf;
      static struct qstr star = {
            .name = "*",
            .len  = 1,
      };

      lock_kernel();

      /*
       * We always prefer unix style. Use info level 1 for older
       * servers that don't do 260.
       */
      if (server->opt.capabilities & SMB_CAP_UNIX)
            info_level = SMB_FIND_FILE_UNIX;
      else if (server->opt.protocol < SMB_PROTOCOL_NT1)
            info_level = 1;

      result = -ENOMEM;
      if (! (name_buf = kmalloc(SMB_MAXNAMELEN+2, GFP_KERNEL)))
            goto out;
      if (! (req = smb_alloc_request(server, server->opt.max_xmit)))
            goto out_name;
      param = req->rq_buffer;

      /*
       * Encode the initial path
       */
      mask = param + 12;

      result = smb_encode_path(server, mask, SMB_MAXPATHLEN+1, dir, &star);
      if (result <= 0)
            goto out_free;
      mask_len = result - 1;  /* mask_len is strlen, not #bytes */
      result = 0;
      first = 1;
      VERBOSE("starting mask_len=%d, mask=%s\n", mask_len, mask);

      entries_seen = 2;
      ff_eos = 0;

      while (ff_eos == 0) {
            loop_count += 1;
            if (loop_count > 10) {
                  printk(KERN_WARNING "smb_proc_readdir_long: "
                         "Looping in FIND_NEXT??\n");
                  result = -EIO;
                  break;
            }

            if (first != 0) {
                  command = TRANSACT2_FINDFIRST;
                  WSET(param, 0, aSYSTEM | aHIDDEN | aDIR);
                  WSET(param, 2, max_matches);  /* max count */
                  WSET(param, 4, SMB_CLOSE_IF_END);
                  WSET(param, 6, info_level);
                  DSET(param, 8, 0);
            } else {
                  command = TRANSACT2_FINDNEXT;

                  VERBOSE("handle=0x%X, lastname=%d, mask=%.*s\n",
                        ff_dir_handle, ff_lastname, mask_len, mask);

                  WSET(param, 0, ff_dir_handle);      /* search handle */
                  WSET(param, 2, max_matches);  /* max count */
                  WSET(param, 4, info_level);
                  DSET(param, 6, 0);
                  WSET(param, 10, SMB_CONTINUE_BIT|SMB_CLOSE_IF_END);
            }

            req->rq_trans2_command = command;
            req->rq_ldata = 0;
            req->rq_data  = NULL;
            req->rq_lparm = 12 + mask_len + 1;
            req->rq_parm  = param;
            req->rq_flags = 0;
            result = smb_add_request(req);
            if (result < 0) {
                  PARANOIA("error=%d, breaking\n", result);
                  break;
            }

            if (req->rq_rcls == ERRSRV && req->rq_err == ERRerror) {
                  /* a damn Win95 bug - sometimes it clags if you 
                     ask it too fast */
                  schedule_timeout_interruptible(msecs_to_jiffies(200));
                  continue;
                }

            if (req->rq_rcls != 0) {
                  result = smb_errno(req);
                  PARANOIA("name=%s, result=%d, rcls=%d, err=%d\n",
                         mask, result, req->rq_rcls, req->rq_err);
                  break;
            }

            /* parse out some important return info */
            if (first != 0) {
                  ff_dir_handle = WVAL(req->rq_parm, 0);
                  ff_searchcount = WVAL(req->rq_parm, 2);
                  ff_eos = WVAL(req->rq_parm, 4);
                  ff_lastname = WVAL(req->rq_parm, 8);
            } else {
                  ff_searchcount = WVAL(req->rq_parm, 0);
                  ff_eos = WVAL(req->rq_parm, 2);
                  ff_lastname = WVAL(req->rq_parm, 6);
            }

            if (ff_searchcount == 0)
                  break;

            /* Now we are ready to parse smb directory entries. */

            /* point to the data bytes */
            p = req->rq_data;
            for (i = 0; i < ff_searchcount; i++) {
                  /* make sure we stay within the buffer */
                  if (p >= req->rq_data + req->rq_ldata) {
                        printk(KERN_ERR "smb_proc_readdir_long: "
                               "dirent pointer outside buffer! "
                               "%p  %d@%p\n",
                               p, req->rq_ldata, req->rq_data);
                        result = -EIO; /* always a comm. error? */
                        goto out_free;
                  }

                  p = smb_decode_long_dirent(server, p, info_level,
                                       &qname, &fattr, name_buf);

                  /* ignore . and .. from the server */
                  if (entries_seen == 2 && qname.name[0] == '.') {
                        if (qname.len == 1)
                              continue;
                        if (qname.name[1] == '.' && qname.len == 2)
                              continue;
                  }

                  if (!smb_fill_cache(filp, dirent, filldir, ctl, 
                                  &qname, &fattr))
                        ;     /* stop reading? */
                  entries_seen++;
            }

            VERBOSE("received %d entries, eos=%d\n", ff_searchcount,ff_eos);

            /*
             * We might need the lastname for continuations.
             *
             * Note that some servers (win95?) point to the filename and
             * others (NT4, Samba using NT1) to the dir entry. We assume
             * here that those who do not point to a filename do not need
             * this info to continue the listing.
             *
             * OS/2 needs this and talks infolevel 1.
             * NetApps want lastname with infolevel 260.
             * win2k want lastname with infolevel 260, and points to
             *       the record not to the name.
             * Samba+CifsUnixExt doesn't need lastname.
             *
             * Both are happy if we return the data they point to. So we do.
             * (FIXME: above is not true with win2k)
             */
            mask_len = 0;
            if (info_level != SMB_FIND_FILE_UNIX &&
                ff_lastname > 0 && ff_lastname < req->rq_ldata) {
                  lastname = req->rq_data + ff_lastname;

                  switch (info_level) {
                  case 260:
                        mask_len = req->rq_ldata - ff_lastname;
                        break;
                  case 1:
                        /* lastname points to a length byte */
                        mask_len = *lastname++;
                        if (ff_lastname + 1 + mask_len > req->rq_ldata)
                              mask_len = req->rq_ldata - ff_lastname - 1;
                        break;
                  }

                  /*
                   * Update the mask string for the next message.
                   */
                  if (mask_len > 255)
                        mask_len = 255;
                  if (mask_len)
                        strncpy(mask, lastname, mask_len);
            }
            mask_len = strnlen(mask, mask_len);
            VERBOSE("new mask, len=%d@%d of %d, mask=%.*s\n",
                  mask_len, ff_lastname, req->rq_ldata, mask_len, mask);

            first = 0;
            loop_count = 0;
      }

out_free:
      smb_rput(req);
out_name:
      kfree(name_buf);
out:
      unlock_kernel();
      return result;
}

/*
 * This version uses the trans2 TRANSACT2_FINDFIRST message 
 * to get the attribute data.
 *
 * Bugs Noted:
 */
static int
smb_proc_getattr_ff(struct smb_sb_info *server, struct dentry *dentry,
                  struct smb_fattr *fattr)
{
      char *param, *mask;
      __u16 date, time;
      int mask_len, result;
      struct smb_request *req;

      result = -ENOMEM;
      if (! (req = smb_alloc_request(server, PAGE_SIZE)))
            goto out;
      param = req->rq_buffer;
      mask = param + 12;

      mask_len = smb_encode_path(server, mask, SMB_MAXPATHLEN+1, dentry,NULL);
      if (mask_len < 0) {
            result = mask_len;
            goto out_free;
      }
      VERBOSE("name=%s, len=%d\n", mask, mask_len);
      WSET(param, 0, aSYSTEM | aHIDDEN | aDIR);
      WSET(param, 2, 1);      /* max count */
      WSET(param, 4, 1);      /* close after this call */
      WSET(param, 6, 1);      /* info_level */
      DSET(param, 8, 0);

      req->rq_trans2_command = TRANSACT2_FINDFIRST;
      req->rq_ldata = 0;
      req->rq_data  = NULL;
      req->rq_lparm = 12 + mask_len;
      req->rq_parm  = param;
      req->rq_flags = 0;
      result = smb_add_request(req);
      if (result < 0)
            goto out_free;
      if (req->rq_rcls != 0) {
            result = smb_errno(req);
#ifdef SMBFS_PARANOIA
            if (result != -ENOENT)
                  PARANOIA("error for %s, rcls=%d, err=%d\n",
                         mask, req->rq_rcls, req->rq_err);
#endif
            goto out_free;
      }
      /* Make sure we got enough data ... */
      result = -EINVAL;
      if (req->rq_ldata < 22 || WVAL(req->rq_parm, 2) != 1) {
            PARANOIA("bad result for %s, len=%d, count=%d\n",
                   mask, req->rq_ldata, WVAL(req->rq_parm, 2));
            goto out_free;
      }

      /*
       * Decode the response into the fattr ...
       */
      date = WVAL(req->rq_data, 0);
      time = WVAL(req->rq_data, 2);
      fattr->f_ctime.tv_sec = date_dos2unix(server, date, time);
      fattr->f_ctime.tv_nsec = 0;

      date = WVAL(req->rq_data, 4);
      time = WVAL(req->rq_data, 6);
      fattr->f_atime.tv_sec = date_dos2unix(server, date, time);
      fattr->f_atime.tv_nsec = 0;

      date = WVAL(req->rq_data, 8);
      time = WVAL(req->rq_data, 10);
      fattr->f_mtime.tv_sec = date_dos2unix(server, date, time);
      fattr->f_mtime.tv_nsec = 0;
      VERBOSE("name=%s, date=%x, time=%x, mtime=%ld\n",
            mask, date, time, fattr->f_mtime.tv_sec);
      fattr->f_size = DVAL(req->rq_data, 12);
      /* ULONG allocation size */
      fattr->attr = WVAL(req->rq_data, 20);
      result = 0;

out_free:
      smb_rput(req);
out:
      return result;
}

static int
smb_proc_getattr_core(struct smb_sb_info *server, struct dentry *dir,
                  struct smb_fattr *fattr)
{
      int result;
      char *p;
      struct smb_request *req;

      result = -ENOMEM;
      if (! (req = smb_alloc_request(server, PAGE_SIZE)))
            goto out;

      p = smb_setup_header(req, SMBgetatr, 0, 0);
      result = smb_simple_encode_path(req, &p, dir, NULL);
      if (result < 0)
            goto out_free;
      smb_setup_bcc(req, p);

      if ((result = smb_request_ok(req, SMBgetatr, 10, 0)) < 0)
            goto out_free;
      fattr->attr    = WVAL(req->rq_header, smb_vwv0);
      fattr->f_mtime.tv_sec = local2utc(server, DVAL(req->rq_header, smb_vwv1));
      fattr->f_mtime.tv_nsec = 0;
      fattr->f_size  = DVAL(req->rq_header, smb_vwv3);
      fattr->f_ctime = fattr->f_mtime; 
      fattr->f_atime = fattr->f_mtime; 
#ifdef SMBFS_DEBUG_TIMESTAMP
      printk("getattr_core: %s/%s, mtime=%ld\n",
             DENTRY_PATH(dir), fattr->f_mtime);
#endif
      result = 0;

out_free:
      smb_rput(req);
out:
      return result;
}

/*
 * Bugs Noted:
 * (1) Win 95 swaps the date and time fields in the standard info level.
 */
static int
smb_proc_getattr_trans2(struct smb_sb_info *server, struct dentry *dir,
                  struct smb_request *req, int infolevel)
{
      char *p, *param;
      int result;

      param = req->rq_buffer;
      WSET(param, 0, infolevel);
      DSET(param, 2, 0);
      result = smb_encode_path(server, param+6, SMB_MAXPATHLEN+1, dir, NULL);
      if (result < 0)
            goto out;
      p = param + 6 + result;

      req->rq_trans2_command = TRANSACT2_QPATHINFO;
      req->rq_ldata = 0;
      req->rq_data  = NULL;
      req->rq_lparm = p - param;
      req->rq_parm  = param;
      req->rq_flags = 0;
      result = smb_add_request(req);
      if (result < 0)
            goto out;
      if (req->rq_rcls != 0) {
            VERBOSE("for %s: result=%d, rcls=%d, err=%d\n",
                  &param[6], result, req->rq_rcls, req->rq_err);
            result = smb_errno(req);
            goto out;
      }
      result = -ENOENT;
      if (req->rq_ldata < 22) {
            PARANOIA("not enough data for %s, len=%d\n",
                   &param[6], req->rq_ldata);
            goto out;
      }

      result = 0;
out:
      return result;
}

static int
smb_proc_getattr_trans2_std(struct smb_sb_info *server, struct dentry *dir,
                      struct smb_fattr *attr)
{
      u16 date, time;
      int off_date = 0, off_time = 2;
      int result;
      struct smb_request *req;

      result = -ENOMEM;
      if (! (req = smb_alloc_request(server, PAGE_SIZE)))
            goto out;

      result = smb_proc_getattr_trans2(server, dir, req, SMB_INFO_STANDARD);
      if (result < 0)
            goto out_free;

      /*
       * Kludge alert: Win 95 swaps the date and time field,
       * contrary to the CIFS docs and Win NT practice.
       */
      if (server->mnt->flags & SMB_MOUNT_WIN95) {
            off_date = 2;
            off_time = 0;
      }
      date = WVAL(req->rq_data, off_date);
      time = WVAL(req->rq_data, off_time);
      attr->f_ctime.tv_sec = date_dos2unix(server, date, time);
      attr->f_ctime.tv_nsec = 0;

      date = WVAL(req->rq_data, 4 + off_date);
      time = WVAL(req->rq_data, 4 + off_time);
      attr->f_atime.tv_sec = date_dos2unix(server, date, time);
      attr->f_atime.tv_nsec = 0;

      date = WVAL(req->rq_data, 8 + off_date);
      time = WVAL(req->rq_data, 8 + off_time);
      attr->f_mtime.tv_sec = date_dos2unix(server, date, time);
      attr->f_mtime.tv_nsec = 0;
#ifdef SMBFS_DEBUG_TIMESTAMP
      printk(KERN_DEBUG "getattr_trans2: %s/%s, date=%x, time=%x, mtime=%ld\n",
             DENTRY_PATH(dir), date, time, attr->f_mtime);
#endif
      attr->f_size = DVAL(req->rq_data, 12);
      attr->attr = WVAL(req->rq_data, 20);

out_free:
      smb_rput(req);
out:
      return result;
}

static int
smb_proc_getattr_trans2_all(struct smb_sb_info *server, struct dentry *dir,
                      struct smb_fattr *attr)
{
      struct smb_request *req;
      int result;

      result = -ENOMEM;
      if (! (req = smb_alloc_request(server, PAGE_SIZE)))
            goto out;

      result = smb_proc_getattr_trans2(server, dir, req,
                               SMB_QUERY_FILE_ALL_INFO);
      if (result < 0)
            goto out_free;

      attr->f_ctime = smb_ntutc2unixutc(LVAL(req->rq_data, 0));
      attr->f_atime = smb_ntutc2unixutc(LVAL(req->rq_data, 8));
      attr->f_mtime = smb_ntutc2unixutc(LVAL(req->rq_data, 16));
      /* change (24) */
      attr->attr = WVAL(req->rq_data, 32);
      /* pad? (34) */
      /* allocated size (40) */
      attr->f_size = LVAL(req->rq_data, 48);

out_free:
      smb_rput(req);
out:
      return result;
}

static int
smb_proc_getattr_unix(struct smb_sb_info *server, struct dentry *dir,
                  struct smb_fattr *attr)
{
      struct smb_request *req;
      int result;

      result = -ENOMEM;
      if (! (req = smb_alloc_request(server, PAGE_SIZE)))
            goto out;

      result = smb_proc_getattr_trans2(server, dir, req,
                               SMB_QUERY_FILE_UNIX_BASIC);
      if (result < 0)
            goto out_free;

      smb_decode_unix_basic(attr, server, req->rq_data);

out_free:
      smb_rput(req);
out:
      return result;
}

static int
smb_proc_getattr_95(struct smb_sb_info *server, struct dentry *dir,
                struct smb_fattr *attr)
{
      struct inode *inode = dir->d_inode;
      int result;

      /* FIXME: why not use the "all" version? */
      result = smb_proc_getattr_trans2_std(server, dir, attr);
      if (result < 0)
            goto out;

      /*
       * None of the getattr versions here can make win9x return the right
       * filesize if there are changes made to an open file.
       * A seek-to-end does return the right size, but we only need to do
       * that on files we have written.
       */
      if (inode && SMB_I(inode)->flags & SMB_F_LOCALWRITE &&
          smb_is_open(inode))
      {
            __u16 fileid = SMB_I(inode)->fileid;
            attr->f_size = smb_proc_seek(server, fileid, 2, 0);
      }

out:
      return result;
}

static int
smb_proc_ops_wait(struct smb_sb_info *server)
{
      int result;

      result = wait_event_interruptible_timeout(server->conn_wq,
                        server->conn_complete, 30*HZ);

      if (!result || signal_pending(current))
            return -EIO;

      return 0;
}

static int
smb_proc_getattr_null(struct smb_sb_info *server, struct dentry *dir,
                    struct smb_fattr *fattr)
{
      int result;

      if (smb_proc_ops_wait(server) < 0)
            return -EIO;

      smb_init_dirent(server, fattr);
      result = server->ops->getattr(server, dir, fattr);
      smb_finish_dirent(server, fattr);

      return result;
}

static int
smb_proc_readdir_null(struct file *filp, void *dirent, filldir_t filldir,
                  struct smb_cache_control *ctl)
{
      struct smb_sb_info *server = server_from_dentry(filp->f_path.dentry);

      if (smb_proc_ops_wait(server) < 0)
            return -EIO;

      return server->ops->readdir(filp, dirent, filldir, ctl);
}

int
smb_proc_getattr(struct dentry *dir, struct smb_fattr *fattr)
{
      struct smb_sb_info *server = server_from_dentry(dir);
      int result;

      smb_init_dirent(server, fattr);
      result = server->ops->getattr(server, dir, fattr);
      smb_finish_dirent(server, fattr);

      return result;
}


/*
 * Because of bugs in the core protocol, we use this only to set
 * attributes. See smb_proc_settime() below for timestamp handling.
 *
 * Bugs Noted:
 * (1) If mtime is non-zero, both Win 3.1 and Win 95 fail
 * with an undocumented error (ERRDOS code 50). Setting
 * mtime to 0 allows the attributes to be set.
 * (2) The extra parameters following the name string aren't
 * in the CIFS docs, but seem to be necessary for operation.
 */
static int
smb_proc_setattr_core(struct smb_sb_info *server, struct dentry *dentry,
                  __u16 attr)
{
      char *p;
      int result;
      struct smb_request *req;

      result = -ENOMEM;
      if (! (req = smb_alloc_request(server, PAGE_SIZE)))
            goto out;

      p = smb_setup_header(req, SMBsetatr, 8, 0);
      WSET(req->rq_header, smb_vwv0, attr);
      DSET(req->rq_header, smb_vwv1, 0); /* mtime */
      WSET(req->rq_header, smb_vwv3, 0); /* reserved values */
      WSET(req->rq_header, smb_vwv4, 0);
      WSET(req->rq_header, smb_vwv5, 0);
      WSET(req->rq_header, smb_vwv6, 0);
      WSET(req->rq_header, smb_vwv7, 0);
      result = smb_simple_encode_path(req, &p, dentry, NULL);
      if (result < 0)
            goto out_free;
      if (p + 2 > (char *)req->rq_buffer + req->rq_bufsize) {
            result = -ENAMETOOLONG;
            goto out_free;
      }
      *p++ = 4;
      *p++ = 0;
      smb_setup_bcc(req, p);

      result = smb_request_ok(req, SMBsetatr, 0, 0);
      if (result < 0)
            goto out_free;
      result = 0;

out_free:
      smb_rput(req);
out:
      return result;
}

/*
 * Because of bugs in the trans2 setattr messages, we must set
 * attributes and timestamps separately. The core SMBsetatr
 * message seems to be the only reliable way to set attributes.
 */
int
smb_proc_setattr(struct dentry *dir, struct smb_fattr *fattr)
{
      struct smb_sb_info *server = server_from_dentry(dir);
      int result;

      VERBOSE("setting %s/%s, open=%d\n", 
            DENTRY_PATH(dir), smb_is_open(dir->d_inode));
      result = smb_proc_setattr_core(server, dir, fattr->attr);
      return result;
}

/*
 * Sets the timestamps for an file open with write permissions.
 */
static int
smb_proc_setattr_ext(struct smb_sb_info *server,
                  struct inode *inode, struct smb_fattr *fattr)
{
      __u16 date, time;
      int result;
      struct smb_request *req;

      result = -ENOMEM;
      if (! (req = smb_alloc_request(server, 0)))
            goto out;

      smb_setup_header(req, SMBsetattrE, 7, 0);
      WSET(req->rq_header, smb_vwv0, SMB_I(inode)->fileid);
      /* We don't change the creation time */
      WSET(req->rq_header, smb_vwv1, 0);
      WSET(req->rq_header, smb_vwv2, 0);
      date_unix2dos(server, fattr->f_atime.tv_sec, &date, &time);
      WSET(req->rq_header, smb_vwv3, date);
      WSET(req->rq_header, smb_vwv4, time);
      date_unix2dos(server, fattr->f_mtime.tv_sec, &date, &time);
      WSET(req->rq_header, smb_vwv5, date);
      WSET(req->rq_header, smb_vwv6, time);
#ifdef SMBFS_DEBUG_TIMESTAMP
      printk(KERN_DEBUG "smb_proc_setattr_ext: date=%d, time=%d, mtime=%ld\n",
             date, time, fattr->f_mtime);
#endif

      req->rq_flags |= SMB_REQ_NORETRY;
      result = smb_request_ok(req, SMBsetattrE, 0, 0);
      if (result < 0)
            goto out_free;
      result = 0;
out_free:
      smb_rput(req);
out:
      return result;
}

/*
 * Bugs Noted:
 * (1) The TRANSACT2_SETPATHINFO message under Win NT 4.0 doesn't
 * set the file's attribute flags.
 */
static int
smb_proc_setattr_trans2(struct smb_sb_info *server,
                  struct dentry *dir, struct smb_fattr *fattr)
{
      __u16 date, time;
      char *p, *param;
      int result;
      char data[26];
      struct smb_request *req;

      result = -ENOMEM;
      if (! (req = smb_alloc_request(server, PAGE_SIZE)))
            goto out;
      param = req->rq_buffer;

      WSET(param, 0, 1);      /* Info level SMB_INFO_STANDARD */
      DSET(param, 2, 0);
      result = smb_encode_path(server, param+6, SMB_MAXPATHLEN+1, dir, NULL);
      if (result < 0)
            goto out_free;
      p = param + 6 + result;

      WSET(data, 0, 0); /* creation time */
      WSET(data, 2, 0);
      date_unix2dos(server, fattr->f_atime.tv_sec, &date, &time);
      WSET(data, 4, date);
      WSET(data, 6, time);
      date_unix2dos(server, fattr->f_mtime.tv_sec, &date, &time);
      WSET(data, 8, date);
      WSET(data, 10, time);
#ifdef SMBFS_DEBUG_TIMESTAMP
      printk(KERN_DEBUG "setattr_trans2: %s/%s, date=%x, time=%x, mtime=%ld\n", 
             DENTRY_PATH(dir), date, time, fattr->f_mtime);
#endif
      DSET(data, 12, 0); /* size */
      DSET(data, 16, 0); /* blksize */
      WSET(data, 20, 0); /* attr */
      DSET(data, 22, 0); /* ULONG EA size */

      req->rq_trans2_command = TRANSACT2_SETPATHINFO;
      req->rq_ldata = 26;
      req->rq_data  = data;
      req->rq_lparm = p - param;
      req->rq_parm  = param;
      req->rq_flags = 0;
      result = smb_add_request(req);
      if (result < 0)
            goto out_free;
      result = 0;
      if (req->rq_rcls != 0)
            result = smb_errno(req);

out_free:
      smb_rput(req);
out:
      return result;
}

/*
 * ATTR_MODE      0x001
 * ATTR_UID       0x002
 * ATTR_GID       0x004
 * ATTR_SIZE      0x008
 * ATTR_ATIME     0x010
 * ATTR_MTIME     0x020
 * ATTR_CTIME     0x040
 * ATTR_ATIME_SET 0x080
 * ATTR_MTIME_SET 0x100
 * ATTR_FORCE     0x200 
 * ATTR_ATTR_FLAG 0x400
 *
 * major/minor should only be set by mknod.
 */
int
smb_proc_setattr_unix(struct dentry *d, struct iattr *attr,
                  unsigned int major, unsigned int minor)
{
      struct smb_sb_info *server = server_from_dentry(d);
      u64 nttime;
      char *p, *param;
      int result;
      char data[100];
      struct smb_request *req;

      result = -ENOMEM;
      if (! (req = smb_alloc_request(server, PAGE_SIZE)))
            goto out;
      param = req->rq_buffer;

      DEBUG1("valid flags = 0x%04x\n", attr->ia_valid);

      WSET(param, 0, SMB_SET_FILE_UNIX_BASIC);
      DSET(param, 2, 0);
      result = smb_encode_path(server, param+6, SMB_MAXPATHLEN+1, d, NULL);
      if (result < 0)
            goto out_free;
      p = param + 6 + result;

      /* 0 L file size in bytes */
      /* 8 L file size on disk in bytes (block count) */
      /* 40 L uid */
      /* 48 L gid */
      /* 56 W file type enum */
      /* 60 L devmajor */
      /* 68 L devminor */
      /* 76 L unique ID (inode) */
      /* 84 L permissions */
      /* 92 L link count */
      LSET(data, 0, SMB_SIZE_NO_CHANGE);
      LSET(data, 8, SMB_SIZE_NO_CHANGE);
      LSET(data, 16, SMB_TIME_NO_CHANGE);
      LSET(data, 24, SMB_TIME_NO_CHANGE);
      LSET(data, 32, SMB_TIME_NO_CHANGE);
      LSET(data, 40, SMB_UID_NO_CHANGE);
      LSET(data, 48, SMB_GID_NO_CHANGE);
      DSET(data, 56, smb_filetype_from_mode(attr->ia_mode));
      LSET(data, 60, major);
      LSET(data, 68, minor);
      LSET(data, 76, 0);
      LSET(data, 84, SMB_MODE_NO_CHANGE);
      LSET(data, 92, 0);

      if (attr->ia_valid & ATTR_SIZE) {
            LSET(data, 0, attr->ia_size);
            LSET(data, 8, 0); /* can't set anyway */
      }

      /*
       * FIXME: check the conversion function it the correct one
       *
       * we can't set ctime but we might as well pass this to the server
       * and let it ignore it.
       */
      if (attr->ia_valid & ATTR_CTIME) {
            nttime = smb_unixutc2ntutc(attr->ia_ctime);
            LSET(data, 16, nttime);
      }
      if (attr->ia_valid & ATTR_ATIME) {
            nttime = smb_unixutc2ntutc(attr->ia_atime);
            LSET(data, 24, nttime);
      }
      if (attr->ia_valid & ATTR_MTIME) {
            nttime = smb_unixutc2ntutc(attr->ia_mtime);
            LSET(data, 32, nttime);
      }
      
      if (attr->ia_valid & ATTR_UID) {
            LSET(data, 40, attr->ia_uid);
      }
      if (attr->ia_valid & ATTR_GID) {
            LSET(data, 48, attr->ia_gid); 
      }
      
      if (attr->ia_valid & ATTR_MODE) {
            LSET(data, 84, attr->ia_mode);
      }

      req->rq_trans2_command = TRANSACT2_SETPATHINFO;
      req->rq_ldata = 100;
      req->rq_data  = data;
      req->rq_lparm = p - param;
      req->rq_parm  = param;
      req->rq_flags = 0;
      result = smb_add_request(req);

out_free:
      smb_rput(req);
out:
      return result;
}


/*
 * Set the modify and access timestamps for a file.
 *
 * Incredibly enough, in all of SMB there is no message to allow
 * setting both attributes and timestamps at once. 
 *
 * Bugs Noted:
 * (1) Win 95 doesn't support the TRANSACT2_SETFILEINFO message 
 * with info level 1 (INFO_STANDARD).
 * (2) Win 95 seems not to support setting directory timestamps.
 * (3) Under the core protocol apparently the only way to set the
 * timestamp is to open and close the file.
 */
int
smb_proc_settime(struct dentry *dentry, struct smb_fattr *fattr)
{
      struct smb_sb_info *server = server_from_dentry(dentry);
      struct inode *inode = dentry->d_inode;
      int result;

      VERBOSE("setting %s/%s, open=%d\n",
            DENTRY_PATH(dentry), smb_is_open(inode));

      /* setting the time on a Win95 server fails (tridge) */
      if (server->opt.protocol >= SMB_PROTOCOL_LANMAN2 && 
          !(server->mnt->flags & SMB_MOUNT_WIN95)) {
            if (smb_is_open(inode) && SMB_I(inode)->access != SMB_O_RDONLY)
                  result = smb_proc_setattr_ext(server, inode, fattr);
            else
                  result = smb_proc_setattr_trans2(server, dentry, fattr);
      } else {
            /*
             * Fail silently on directories ... timestamp can't be set?
             */
            result = 0;
            if (S_ISREG(inode->i_mode)) {
                  /*
                   * Set the mtime by opening and closing the file.
                   * Note that the file is opened read-only, but this
                   * still allows us to set the date (tridge)
                   */
                  result = -EACCES;
                  if (!smb_is_open(inode))
                        smb_proc_open(server, dentry, SMB_O_RDONLY);
                  if (smb_is_open(inode)) {
                        inode->i_mtime = fattr->f_mtime;
                        result = smb_proc_close_inode(server, inode);
                  }
            }
      }

      return result;
}

int
smb_proc_dskattr(struct dentry *dentry, struct kstatfs *attr)
{
      struct smb_sb_info *server = SMB_SB(dentry->d_sb);
      int result;
      char *p;
      long unit;
      struct smb_request *req;

      result = -ENOMEM;
      if (! (req = smb_alloc_request(server, 0)))
            goto out;

      smb_setup_header(req, SMBdskattr, 0, 0);
      if ((result = smb_request_ok(req, SMBdskattr, 5, 0)) < 0)
            goto out_free;
      p = SMB_VWV(req->rq_header);
      unit = (WVAL(p, 2) * WVAL(p, 4)) >> SMB_ST_BLKSHIFT;
      attr->f_blocks = WVAL(p, 0) * unit;
      attr->f_bsize  = SMB_ST_BLKSIZE;
      attr->f_bavail = attr->f_bfree = WVAL(p, 6) * unit;
      result = 0;

out_free:
      smb_rput(req);
out:
      return result;
}

int
smb_proc_read_link(struct smb_sb_info *server, struct dentry *d,
               char *buffer, int len)
{
      char *p, *param;
      int result;
      struct smb_request *req;

      DEBUG1("readlink of %s/%s\n", DENTRY_PATH(d));

      result = -ENOMEM;
      if (! (req = smb_alloc_request(server, PAGE_SIZE)))
            goto out;
      param = req->rq_buffer;

      WSET(param, 0, SMB_QUERY_FILE_UNIX_LINK);
      DSET(param, 2, 0);
      result = smb_encode_path(server, param+6, SMB_MAXPATHLEN+1, d, NULL);
      if (result < 0)
            goto out_free;
      p = param + 6 + result;

      req->rq_trans2_command = TRANSACT2_QPATHINFO;
      req->rq_ldata = 0;
      req->rq_data  = NULL;
      req->rq_lparm = p - param;
      req->rq_parm  = param;
      req->rq_flags = 0;
      result = smb_add_request(req);
      if (result < 0)
            goto out_free;
      DEBUG1("for %s: result=%d, rcls=%d, err=%d\n",
            &param[6], result, req->rq_rcls, req->rq_err);

      /* copy data up to the \0 or buffer length */
      result = len;
      if (req->rq_ldata < len)
            result = req->rq_ldata;
      strncpy(buffer, req->rq_data, result);

out_free:
      smb_rput(req);
out:
      return result;
}


/*
 * Create a symlink object called dentry which points to oldpath.
 * Samba does not permit dangling links but returns a suitable error message.
 */
int
smb_proc_symlink(struct smb_sb_info *server, struct dentry *d,
             const char *oldpath)
{
      char *p, *param;
      int result;
      struct smb_request *req;

      result = -ENOMEM;
      if (! (req = smb_alloc_request(server, PAGE_SIZE)))
            goto out;
      param = req->rq_buffer;

      WSET(param, 0, SMB_SET_FILE_UNIX_LINK);
      DSET(param, 2, 0);
      result = smb_encode_path(server, param + 6, SMB_MAXPATHLEN+1, d, NULL);
      if (result < 0)
            goto out_free;
      p = param + 6 + result;

      req->rq_trans2_command = TRANSACT2_SETPATHINFO;
      req->rq_ldata = strlen(oldpath) + 1;
      req->rq_data  = (char *) oldpath;
      req->rq_lparm = p - param;
      req->rq_parm  = param;
      req->rq_flags = 0;
      result = smb_add_request(req);
      if (result < 0)
            goto out_free;

      DEBUG1("for %s: result=%d, rcls=%d, err=%d\n",
            &param[6], result, req->rq_rcls, req->rq_err);
      result = 0;

out_free:
      smb_rput(req);
out:
      return result;
}

/*
 * Create a hard link object called new_dentry which points to dentry.
 */
int
smb_proc_link(struct smb_sb_info *server, struct dentry *dentry,
            struct dentry *new_dentry)
{
      char *p, *param;
      int result;
      struct smb_request *req;

      result = -ENOMEM;
      if (! (req = smb_alloc_request(server, PAGE_SIZE)))
            goto out;
      param = req->rq_buffer;

      WSET(param, 0, SMB_SET_FILE_UNIX_HLINK);
      DSET(param, 2, 0);
      result = smb_encode_path(server, param + 6, SMB_MAXPATHLEN+1,
                         new_dentry, NULL);
      if (result < 0)
            goto out_free;
      p = param + 6 + result;

      /* Grr, pointless separation of parameters and data ... */
      req->rq_data = p;
      req->rq_ldata = smb_encode_path(server, p, SMB_MAXPATHLEN+1,
                              dentry, NULL);

      req->rq_trans2_command = TRANSACT2_SETPATHINFO;
      req->rq_lparm = p - param;
      req->rq_parm  = param;
      req->rq_flags = 0;
      result = smb_add_request(req);
      if (result < 0)
            goto out_free;

      DEBUG1("for %s: result=%d, rcls=%d, err=%d\n",
             &param[6], result, req->rq_rcls, req->rq_err);
      result = 0;

out_free:
      smb_rput(req);
out:
      return result;
}

static int
smb_proc_query_cifsunix(struct smb_sb_info *server)
{
      int result;
      int major, minor;
      u64 caps;
      char param[2];
      struct smb_request *req;

      result = -ENOMEM;
      if (! (req = smb_alloc_request(server, 100)))
            goto out;

      WSET(param, 0, SMB_QUERY_CIFS_UNIX_INFO);

      req->rq_trans2_command = TRANSACT2_QFSINFO;
      req->rq_ldata = 0;
      req->rq_data  = NULL;
      req->rq_lparm = 2;
      req->rq_parm  = param;
      req->rq_flags = 0;
      result = smb_add_request(req);
      if (result < 0)
            goto out_free;

      if (req->rq_ldata < 12) {
            PARANOIA("Not enough data\n");
            goto out_free;
      }
      major = WVAL(req->rq_data, 0);
      minor = WVAL(req->rq_data, 2);

      DEBUG1("Server implements CIFS Extensions for UNIX systems v%d.%d\n",
             major, minor);
      /* FIXME: verify that we are ok with this major/minor? */

      caps = LVAL(req->rq_data, 4);
      DEBUG1("Server capabilities 0x%016llx\n", caps);

out_free:
      smb_rput(req);
out:
      return result;
}


static void
install_ops(struct smb_ops *dst, struct smb_ops *src)
{
      memcpy(dst, src, sizeof(void *) * SMB_OPS_NUM_STATIC);
}

/* < LANMAN2 */
static struct smb_ops smb_ops_core =
{
      .read       = smb_proc_read,
      .write            = smb_proc_write,
      .readdir    = smb_proc_readdir_short,
      .getattr    = smb_proc_getattr_core,
      .truncate   = smb_proc_trunc32,
};

/* LANMAN2, OS/2, others? */
static struct smb_ops smb_ops_os2 =
{
      .read       = smb_proc_read,
      .write            = smb_proc_write,
      .readdir    = smb_proc_readdir_long,
      .getattr    = smb_proc_getattr_trans2_std,
      .truncate   = smb_proc_trunc32,
};

/* Win95, and possibly some NetApp versions too */
static struct smb_ops smb_ops_win95 =
{
      .read       = smb_proc_read,    /* does not support 12word readX */
      .write            = smb_proc_write,
      .readdir    = smb_proc_readdir_long,
      .getattr    = smb_proc_getattr_95,
      .truncate   = smb_proc_trunc95,
};

/* Samba, NT4 and NT5 */
static struct smb_ops smb_ops_winNT =
{
      .read       = smb_proc_readX,
      .write            = smb_proc_writeX,
      .readdir    = smb_proc_readdir_long,
      .getattr    = smb_proc_getattr_trans2_all,
      .truncate   = smb_proc_trunc64,
};

/* Samba w/ unix extensions. Others? */
static struct smb_ops smb_ops_unix =
{
      .read       = smb_proc_readX,
      .write            = smb_proc_writeX,
      .readdir    = smb_proc_readdir_long,
      .getattr    = smb_proc_getattr_unix,
      /* FIXME: core/ext/time setattr needs to be cleaned up! */
      /* .setattr = smb_proc_setattr_unix, */
      .truncate   = smb_proc_trunc64,
};

/* Place holder until real ops are in place */
static struct smb_ops smb_ops_null =
{
      .readdir    = smb_proc_readdir_null,
      .getattr    = smb_proc_getattr_null,
};

void smb_install_null_ops(struct smb_ops *ops)
{
      install_ops(ops, &smb_ops_null);
}

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