[IA64] Minimize per_cpu reservations.

[linux-2.6] / fs / smbfs / 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);
}