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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [fs/] [smbfs/] [proc.c] - Blame information for rev 1765

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/*
 *  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/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/smb_fs.h>
#include <linux/smbno.h>
#include <linux/smb_mount.h>
 
#include <asm/string.h>
#include <asm/div64.h>
 
#include "smb_debug.h"
#include "proto.h"
 
 
/* Features. Undefine if they cause problems, this should perhaps be a
   config option. */
#define SMBFS_POSIX_UNLINK 1
 
#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_BCC(packet)  smb_bcc(packet)
#define SMB_BUF(packet)  ((packet) + SMB_HEADER_LEN + SMB_WCT(packet) * 2 + 2)
 
#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 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 *dir,
                    struct smb_fattr *fattr);
static int
smb_proc_setattr_ext(struct smb_sb_info *, struct inode *,
                     struct smb_fattr *);
static int
smb_proc_setattr_core(struct smb_sb_info *server, struct dentry *dentry,
                      __u16 attr);
static void
install_ops(struct smb_ops *dst, struct smb_ops *src);
static int
smb_proc_query_cifsunix(struct smb_sb_info *server);
 
 
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((unsigned char *)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;
}
 
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)
                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;
 
        n = setcodepage(&server->local_nls, cp->local_name);
        if (n != 0)
                goto out;
        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, char * buf, int maxlen,
                          struct dentry * entry, struct qstr * name)
{
        char *path = buf;
        int len;
 
        if (maxlen < 2)
                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++ = '\\';
                *path++ = '\0';
                return 2;
        }
 
        /*
         * Build the path string walking the tree backward from end to ROOT
         * and store it in reversed order [see reverse_string()]
         */
        while (!IS_ROOT(entry)) {
                if (maxlen < 3)
                        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)
                        return len;
                reverse_string(path, len);
                path += len;
                *path++ = '\\';
                maxlen -= len+1;
 
                entry = entry->d_parent;
                if (IS_ROOT(entry))
                        break;
        }
        reverse_string(buf, path-buf);
 
        /* maxlen is at least 1 */
test_name_and_out:
        if (name) {
                if (maxlen < 3)
                        return -ENAMETOOLONG;
                *path++ = '\\';
                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 is at least 1 */
        *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;
}
 
static int smb_simple_encode_path(struct smb_sb_info *server, char **p,
                          struct dentry * entry, struct qstr * name)
{
        char *s = *p;
        int res;
        int maxlen = ((char *)server->packet + server->packet_size) - s;
 
        if (!maxlen)
                return -ENAMETOOLONG;
        *s++ = 4;
        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 time_t
smb_ntutc2unixutc(u64 ntutc)
{
        /* FIXME: what about the timezone difference? */
        /* Subtract the NTFS time offset, then convert to 1s intervals. */
        u64 t = ntutc - NTFS_TIME_OFFSET;
        do_div(t, 10000000);
        return (time_t)t;
}
 
static u64
smb_unixutc2ntutc(time_t t)
{
        /* Note: timezone conversion is probably wrong. */
        return ((u64)t) * 10000000 + 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 (mode & S_IFREG)
                return UNIX_TYPE_FILE;
        if (mode & S_IFDIR)
                return UNIX_TYPE_DIR;
        if (mode & S_IFLNK)
                return UNIX_TYPE_SYMLINK;
        if (mode & S_IFCHR)
                return UNIX_TYPE_CHARDEV;
        if (mode & S_IFBLK)
                return UNIX_TYPE_BLKDEV;
        if (mode & S_IFIFO)
                return UNIX_TYPE_FIFO;
        if (mode & S_IFSOCK)
                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("packet=%d, xmit=%d, size=%d\n",
                server->packet_size, 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("packet=%d, xmit=%d, size=%d\n",
                server->packet_size, server->opt.max_xmit, size);
 
        return size;
}
 
/*
 * Convert SMB error codes to -E... errno values.
 */
int
smb_errno(struct smb_sb_info *server)
{
        int errcls = server->rcls;
        int error  = server->err;
        char *class = "Unknown";
 
        VERBOSE("errcls %d  code %d  from command 0x%x\n",
                errcls, error, SMB_CMD(server->packet));
 
        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:
                        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(server->packet));
        return -EIO;
}
 
/*
 * smb_retry: This function should be called when smb_request_ok has
 * indicated an error. If the error was indicated because the
 * connection was killed, we try to reconnect. If smb_retry returns 0,
 * the error was indicated for another reason, so a retry would not be
 * of any use.
 * N.B. The server must be locked for this call.
 */
static int
smb_retry(struct smb_sb_info *server)
{
        pid_t pid = server->conn_pid;
        int error, result = 0;
 
        if (server->state == CONN_VALID || server->state == CONN_RETRYING)
                goto out;
 
        smb_close_socket(server);
 
        if (pid == 0) {
                printk(KERN_ERR "smb_retry: no connection process\n");
                server->state = CONN_RETRIED;
                goto out;
        }
 
        /*
         * Change state so that only one retry per server will be started.
         */
        server->state = CONN_RETRYING;
 
        /*
         * Note: use the "priv" flag, as a user process may need to reconnect.
         */
        error = kill_proc(pid, SIGUSR1, 1);
        if (error) {
                /* FIXME: this is fatal */
                printk(KERN_ERR "smb_retry: signal failed, error=%d\n", error);
                goto out;
        }
        VERBOSE("signalled pid %d, waiting for new connection\n", pid);
 
        /*
         * Wait for the new connection.
         */
        smb_unlock_server(server);
        interruptible_sleep_on_timeout(&server->wait, server->mnt->timeo*HZ);
        smb_lock_server(server);
        if (signal_pending(current))
                printk(KERN_INFO "smb_retry: caught signal\n");
 
        /*
         * Check for a valid connection.
         */
        if (server->state == CONN_VALID) {
                /* This should be changed to VERBOSE, except many smbfs
                   problems is with the userspace daemon not reconnecting. */
                PARANOIA("successful, new pid=%d, generation=%d\n",
                         server->conn_pid, server->generation);
                result = 1;
        } else if (server->state == CONN_RETRYING) {
                /* allow further attempts later */
                server->state = CONN_RETRIED;
        }
 
out:
        return result;
}
 
/* 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_sb_info *s, int command, int wct, int bcc)
{
        int result = -EIO;
 
        s->rcls = 0;
        s->err = 0;
 
        /* Make sure we have a connection */
        if (s->state != CONN_VALID) {
                if (!smb_retry(s))
                        goto out;
        }
 
        if (smb_request(s) < 0) {
                DEBUG1("smb_request failed\n");
                goto out;
        }
        if (smb_valid_packet(s->packet) != 0) {
                PARANOIA("invalid packet!\n");
                goto out;
        }
 
        /*
         * Check for server errors.
         */
        if (s->rcls != 0) {
                result = smb_errno(s);
                if (!result)
                        printk(KERN_DEBUG "smb_request_ok: rcls=%d, err=%d mapped to 0\n",
                                s->rcls, s->err);
                /*
                 * Exit now even if the error was squashed ...
                 * packet verify will fail anyway.
                 */
                goto out;
        }
        result = smb_verify(s->packet, 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;
        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_dentry->d_inode))
                goto out_putf;
 
        server->sock_file = filp;
        server->conn_pid = current->pid;
        smb_catch_keepalive(server);
        server->opt = *opt;
        server->generation += 1;
        server->state = CONN_VALID;
        error = 0;
 
        /* 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");
        }
#ifndef CONFIG_SMB_UNIX
        server->opt.capabilities &= ~SMB_CAP_UNIX;
#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, server->conn_pid,
                server->opt.capabilities);
 
        /* Make sure we can fit a message of the negotiated size in our
           packet buffer. */
        if (server->opt.max_xmit > server->packet_size) {
                int len = smb_round_length(server->opt.max_xmit);
                char *buf = smb_vmalloc(len);
                if (buf) {
                        if (server->packet)
                                smb_vfree(server->packet);
                        server->packet = buf;
                        server->packet_size = len;
                } else {
                        /* else continue with the too small buffer? */
                        PARANOIA("Failed to allocate new packet buffer: "
                                 "max_xmit=%d, packet_size=%d\n",
                                 server->opt.max_xmit, server->packet_size);
                        server->opt.max_xmit = server->packet_size;
                }
        }
 
        if (server->opt.capabilities & SMB_CAP_UNIX)
                smb_proc_query_cifsunix(server);
 
out:
        smb_unlock_server(server);
        smb_wakeup(server);
        return error;
 
out_putf:
        fput(filp);
        goto out;
}
 
int
smb_wakeup(struct smb_sb_info *server)
{
        wake_up_interruptible(&server->wait);
        return 0;
}
 
/* smb_setup_header: We completely set up the packet. You only have to
   insert the command-specific fields */
 
__u8 *
smb_setup_header(struct smb_sb_info * server, __u8 command, __u16 wct, __u16 bcc)
{
        __u32 xmit_len = SMB_HEADER_LEN + wct * sizeof(__u16) + bcc + 2;
        __u8 *p = server->packet;
        __u8 *buf = server->packet;
 
        if (xmit_len > server->packet_size)
                printk(KERN_DEBUG "smb_setup_header: "
                       "Aieee, xmit len > packet! len=%d, size=%d\n",
                       xmit_len, server->packet_size);
 
        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;
 
        WSET(buf, smb_tid, server->opt.tid);
        WSET(buf, smb_pid, 1);
        WSET(buf, smb_uid, server->opt.server_uid);
        WSET(buf, smb_mid, 1);
 
        if (server->opt.protocol > SMB_PROTOCOL_CORE)
        {
                *(buf+smb_flg) = 0x8;
                WSET(buf, smb_flg2, 0x3);
        }
        *p++ = wct;             /* wct */
        p += 2 * wct;
        WSET(p, 0, bcc);
        return p + 2;
}
 
static void
smb_setup_bcc(struct smb_sb_info *server, __u8 * p)
{
        __u8 *packet = server->packet;
        __u8 *pbcc = packet + SMB_HEADER_LEN + 2 * SMB_WCT(packet);
        __u16 bcc = p - (pbcc + 2);
 
        WSET(pbcc, 0, bcc);
        smb_encode_smb_length(packet,
                              SMB_HEADER_LEN + 2 * SMB_WCT(packet) - 2 + bcc);
}
 
/*
 * Called with the server locked
 */
static int
smb_proc_seek(struct smb_sb_info *server, __u16 fileid,
              __u16 mode, off_t offset)
{
        int result;
 
        smb_setup_header(server, SMBlseek, 4, 0);
        WSET(server->packet, smb_vwv0, fileid);
        WSET(server->packet, smb_vwv1, mode);
        DSET(server->packet, smb_vwv2, offset);
 
        result = smb_request_ok(server, SMBlseek, 2, 0);
        if (result < 0) {
                result = 0;
                goto out;
        }
 
        result = DVAL(server->packet, smb_vwv0);
out:
        return result;
}
 
/*
 * We're called with the server locked, and we leave it that way.
 */
static int
smb_proc_open(struct smb_sb_info *server, struct dentry *dentry, int wish)
{
        struct inode *ino = dentry->d_inode;
        int mode, read_write = 0x42, read_only = 0x40;
        int res;
        char *p;
 
        /*
         * 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
 
      retry:
        p = smb_setup_header(server, SMBopen, 2, 0);
        WSET(server->packet, smb_vwv0, mode);
        WSET(server->packet, smb_vwv1, aSYSTEM | aHIDDEN | aDIR);
        res = smb_simple_encode_path(server, &p, dentry, NULL);
        if (res < 0)
                goto out;
        smb_setup_bcc(server, p);
 
        res = smb_request_ok(server, SMBopen, 7, 0);
        if (res != 0) {
                if (smb_retry(server))
                        goto retry;
 
                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;
                        goto retry;
                }
                goto out;
        }
        /* We should now have data in vwv[0..6]. */
 
        ino->u.smbfs_i.fileid = WVAL(server->packet, smb_vwv0);
        ino->u.smbfs_i.attr   = WVAL(server->packet, smb_vwv1);
        /* smb_vwv2 has mtime */
        /* smb_vwv4 has size  */
        ino->u.smbfs_i.access = (WVAL(server->packet, smb_vwv6) & SMB_ACCMASK);
        ino->u.smbfs_i.open = server->generation;
 
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;
 
        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);
                smb_lock_server(server);
                result = 0;
                if (!smb_is_open(inode))
                        result = smb_proc_open(server, dentry, wish);
                smb_unlock_server(server);
                if (result) {
                        PARANOIA("%s/%s open failed, result=%d\n",
                                 DENTRY_PATH(dentry), 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;
        if (inode->u.smbfs_i.access != wish &&
            inode->u.smbfs_i.access != SMB_O_RDWR)
        {
                PARANOIA("%s/%s access denied, access=%x, wish=%x\n",
                         DENTRY_PATH(dentry), inode->u.smbfs_i.access, wish);
                result = -EACCES;
        }
out:
        return result;
}
 
/* We're called with the server locked */
 
static int
smb_proc_close(struct smb_sb_info *server, __u16 fileid, __u32 mtime)
{
        smb_setup_header(server, SMBclose, 3, 0);
        WSET(server->packet, smb_vwv0, fileid);
        DSET(server->packet, smb_vwv1, utc2local(server, mtime));
        return smb_request_ok(server, SMBclose, 0, 0);
}
 
/*
 * Called with the server locked.
 *
 * 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)
{
        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.
                 */
                ino->u.smbfs_i.open = 0;
 
                /*
                 * Kludge alert: SMB timestamps are accurate only to
                 * two seconds ... round the times to avoid needless
                 * cache invalidations!
                 */
                if (ino->i_mtime & 1)
                        ino->i_mtime--;
                if (ino->i_atime & 1)
                        ino->i_atime--;
                /*
                 * 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) &&
                    !(ino->u.smbfs_i.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, ino->u.smbfs_i.fileid,
                                                ino->i_mtime);
                /*
                 * 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)
                        ino->u.smbfs_i.oldmtime = 0;
                ino->u.smbfs_i.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);
                smb_lock_server(server);
                result = smb_proc_close_inode(server, ino);
                smb_unlock_server(server);
        }
        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;
 
        smb_lock_server(server);
        result = smb_proc_close(server, fileid, CURRENT_TIME);
        smb_unlock_server(server);
        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 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;
 
        smb_lock_server(server);
        smb_setup_header(server, SMBread, 5, 0);
        buf = server->packet;
        WSET(buf, smb_vwv0, inode->u.smbfs_i.fileid);
        WSET(buf, smb_vwv1, count);
        DSET(buf, smb_vwv2, offset);
        WSET(buf, smb_vwv4, 0);
 
        result = smb_request_ok(server, SMBread, 5, -1);
        if (result < 0)
                goto out;
        returned_count = WVAL(server->packet, smb_vwv0);
 
        buf = SMB_BUF(server->packet);
        data_len = WVAL(buf, 1);
 
        /* we can NOT simply trust the data_len given by the server ... */
        if (data_len > server->packet_size - (buf+3 - server->packet)) {
                printk(KERN_ERR "smb_proc_read: invalid data length!! "
                       "%d > %d - (%p - %p)\n",
                       data_len, server->packet_size, buf+3, server->packet);
                result = -EIO;
                goto out;
        }
 
        memcpy(data, buf+3, data_len);
 
        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:
        VERBOSE("ino=%ld, fileid=%d, count=%d, result=%d\n",
                inode->i_ino, inode->u.smbfs_i.fileid, count, result);
        smb_unlock_server(server);
        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;
        __u8 *p;
        __u16 fileid = inode->u.smbfs_i.fileid;
 
        VERBOSE("ino=%ld, fileid=%d, count=%d@%Ld, packet_size=%d\n",
                inode->i_ino, inode->u.smbfs_i.fileid, count, offset,
                server->packet_size);
 
        smb_lock_server(server);
        p = smb_setup_header(server, SMBwrite, 5, count + 3);
        WSET(server->packet, smb_vwv0, fileid);
        WSET(server->packet, smb_vwv1, count);
        DSET(server->packet, smb_vwv2, offset);
        WSET(server->packet, smb_vwv4, 0);
 
        *p++ = 1;
        WSET(p, 0, count);
        memcpy(p+2, data, count);
 
        result = smb_request_ok(server, SMBwrite, 1, 0);
        if (result >= 0)
                result = WVAL(server->packet, smb_vwv0);
 
        smb_unlock_server(server);
        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.
 */
static int
smb_proc_readX(struct inode *inode, loff_t offset, int count, char *data)
{
        struct smb_sb_info *server = server_from_inode(inode);
        u16 data_len, data_off;
        unsigned char *buf;
        int result;
 
        smb_lock_server(server);
        smb_setup_header(server, SMBreadX, 12, 0);
        buf = server->packet;
        WSET(buf, smb_vwv0, 0x00ff);
        WSET(buf, smb_vwv1, 0);
        WSET(buf, smb_vwv2, inode->u.smbfs_i.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);
 
        result = smb_request_ok(server, SMBreadX, 12, -1);
        if (result < 0)
                goto out;
        data_len = WVAL(server->packet, smb_vwv5);
        data_off = WVAL(server->packet, smb_vwv6);
        buf = smb_base(server->packet) + data_off;
 
        /* we can NOT simply trust the info given by the server ... */
        if (data_len > server->packet_size - (buf - server->packet)) {
                printk(KERN_ERR "smb_proc_read: invalid data length!! "
                       "%d > %d - (%p - %p)\n",
                       data_len, server->packet_size, buf, server->packet);
                result = -EIO;
                goto out;
        }
 
        memcpy(data, buf, data_len);
        result = data_len;
 
out:
        smb_unlock_server(server);
        VERBOSE("ino=%ld, fileid=%d, count=%d, result=%d\n",
                inode->i_ino, inode->u.smbfs_i.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;
 
        VERBOSE("ino=%ld, fileid=%d, count=%d@%Ld, packet_size=%d\n",
                inode->i_ino, inode->u.smbfs_i.fileid, count, offset,
                server->packet_size);
 
        smb_lock_server(server);
        p = smb_setup_header(server, SMBwriteX, 14, count + 2);
        WSET(server->packet, smb_vwv0, 0x00ff);
        WSET(server->packet, smb_vwv1, 0);
        WSET(server->packet, smb_vwv2, inode->u.smbfs_i.fileid);
        DSET(server->packet, smb_vwv3, (u32)offset);    /* low 32 bits */
        DSET(server->packet, smb_vwv5, 0);
        WSET(server->packet, smb_vwv7, 0);              /* write mode */
        WSET(server->packet, smb_vwv8, 0);
        WSET(server->packet, smb_vwv9, 0);
        WSET(server->packet, smb_vwv10, count);         /* data length */
        WSET(server->packet, smb_vwv11, p + 2 - smb_base(server->packet));
        DSET(server->packet, smb_vwv12, (u32)(offset >> 32));
        *p++ = 0;    /* FIXME: pad to short or long ... change +2 above also */
        *p++ = 0;
        memcpy(p, data, count);
 
        result = smb_request_ok(server, SMBwriteX, 6, 0);
        if (result >= 0)
                result = WVAL(server->packet, smb_vwv2);
 
        smb_unlock_server(server);
        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;
 
        smb_lock_server(server);
 
      retry:
        p = smb_setup_header(server, SMBcreate, 3, 0);
        WSET(server->packet, smb_vwv0, attr);
        DSET(server->packet, smb_vwv1, utc2local(server, ctime));
        result = smb_simple_encode_path(server, &p, dentry, NULL);
        if (result < 0)
                goto out;
        smb_setup_bcc(server, p);
 
        result = smb_request_ok(server, SMBcreate, 1, 0);
        if (result < 0) {
                if (smb_retry(server))
                        goto retry;
                goto out;
        }
        *fileid = WVAL(server->packet, smb_vwv0);
        result = 0;
 
out:
        smb_unlock_server(server);
        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;
 
        smb_lock_server(server);
 
      retry:
        p = smb_setup_header(server, SMBmv, 1, 0);
        WSET(server->packet, smb_vwv0, aSYSTEM | aHIDDEN | aDIR);
        result = smb_simple_encode_path(server, &p, old_dentry, NULL);
        if (result < 0)
                goto out;
        result = smb_simple_encode_path(server, &p, new_dentry, NULL);
        if (result < 0)
                goto out;
        smb_setup_bcc(server, p);
 
        if ((result = smb_request_ok(server, SMBmv, 0, 0)) < 0) {
                if (smb_retry(server))
                        goto retry;
                goto out;
        }
        result = 0;
out:
        smb_unlock_server(server);
        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;
 
        smb_lock_server(server);
 
      retry:
        p = smb_setup_header(server, command, 0, 0);
        result = smb_simple_encode_path(server, &p, dentry, NULL);
        if (result < 0)
                goto out;
        smb_setup_bcc(server, p);
 
        result = smb_request_ok(server, command, 0, 0);
        if (result < 0) {
                if (smb_retry(server))
                        goto retry;
                goto out;
        }
        result = 0;
out:
        smb_unlock_server(server);
        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.
 * Note: called with the server locked.
 */
static int
smb_set_rw(struct dentry *dentry,struct smb_sb_info *server)
{
        int result;
        struct smb_fattr fattr;
 
        /* 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;
 
        smb_lock_server(server);
 
      retry:
        p = smb_setup_header(server, SMBunlink, 1, 0);
        WSET(server->packet, smb_vwv0, aSYSTEM | aHIDDEN);
        result = smb_simple_encode_path(server, &p, dentry, NULL);
        if (result < 0)
                goto out;
        smb_setup_bcc(server, p);
 
        if ((result = smb_request_ok(server, 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;
                                goto retry;
                        }
                }
#endif
                if (smb_retry(server))
                        goto retry;
                goto out;
        }
        result = 0;
out:
        smb_unlock_server(server);
        return result;
}
 
/*
 * Called with the server locked
 */
int
smb_proc_flush(struct smb_sb_info *server, __u16 fileid)
{
        smb_setup_header(server, SMBflush, 1, 0);
        WSET(server->packet, smb_vwv0, fileid);
        return smb_request_ok(server, SMBflush, 0, 0);
}
 
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 command;
        int result;
        char *param = server->temp_buf;
        char data[8];
        unsigned char *resp_data = NULL;
        unsigned char *resp_param = NULL;
        int resp_data_len = 0;
        int resp_param_len = 0;
 
        smb_lock_server(server);
        command = TRANSACT2_SETFILEINFO;
 
        /* FIXME: must we also set allocation size? winNT seems to do that */
 retry:
        WSET(param, 0, inode->u.smbfs_i.fileid);
        WSET(param, 2, SMB_SET_FILE_END_OF_FILE_INFO);
        WSET(param, 4, 0);
        LSET(data, 0, length);
        result = smb_trans2_request(server, command,
                                    8, data, 6, param,
                                    &resp_data_len, &resp_data,
                                    &resp_param_len, &resp_param);
        if (result < 0) {
                if (smb_retry(server))
                        goto retry;
                goto out;
        }
        result = 0;
        if (server->rcls != 0)
                result = smb_errno(server);
 
out:
        smb_unlock_server(server);
        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_lock_server(server);
        smb_proc_flush(server, inode->u.smbfs_i.fileid);
        smb_unlock_server(server);
        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_blksize = SMB_ST_BLKSIZE;
        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)
{
        smb_init_dirent(server, fattr);
        fattr->attr = aDIR;
        fattr->f_ino = 2; /* traditional root inode number */
        fattr->f_mtime = CURRENT_TIME;
        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)
{
        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 = date_dos2unix(server, WVAL(p, 3), WVAL(p, 1));
        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--;
        qname->len = 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(server->name_buf, SMB_MAXNAMELEN,
                            qname->name, len,
                            server->remote_nls, server->local_nls);
        if (len > 0) {
                qname->len = len;
                qname->name = server->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_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 = { "*.*", 3, 0 };
        unsigned char *last_status;
 
        VERBOSE("%s/%s\n", DENTRY_PATH(dir));
 
        smb_lock_server(server);
 
        first = 1;
        entries = 0;
        entries_seen = 2; /* implicit . and .. */
 
        while (1) {
                p = smb_setup_header(server, SMBsearch, 2, 0);
                WSET(server->packet, smb_vwv0, entries_asked);
                WSET(server->packet, smb_vwv1, aDIR);
                if (first == 1) {
                        result = smb_simple_encode_path(server, &p, dir, &mask);
                        if (result < 0)
                                goto unlock_return;
                        if (p + 3 > (char*)server->packet+server->packet_size) {
                                result = -ENAMETOOLONG;
                                goto unlock_return;
                        }
                        *p++ = 5;
                        WSET(p, 0, 0);
                        p += 2;
                        first = 0;
                } else {
                        if (p + 5 + SMB_STATUS_SIZE >
                            (char*)server->packet + server->packet_size) {
                                result = -ENAMETOOLONG;
                                goto unlock_return;
                        }
 
                        *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(server, p);
 
                result = smb_request_ok(server, SMBsearch, 1, -1);
                if (result < 0) {
                        if ((server->rcls == ERRDOS) &&
                            (server->err  == ERRnofiles))
                                break;
                        if (smb_retry(server)) {
                                ctl->idx = -1;  /* retry */
                                result = 0;
                        }
                        goto unlock_return;
                }
                p = SMB_VWV(server->packet);
                count = WVAL(p, 0);
                if (count <= 0)
                        break;
 
                result = -EIO;
                bcc = WVAL(p, 2);
                if (bcc != count * SMB_DIRINFO_SIZE + 3)
                        goto unlock_return;
                p += 7;
 
 
                /* Make sure the response fits in the buffer. Fixed sized
                   entries means we don't have to check in the decode loop. */
 
                last_status = SMB_BUF(server->packet) + 3 + (count - 1) *
                        SMB_DIRINFO_SIZE;
 
                if (last_status + SMB_DIRINFO_SIZE >=
                    server->packet + server->packet_size) {
                        printk(KERN_ERR "smb_proc_readdir_short: "
                               "last dir entry outside buffer! "
                               "%d@%p  %d@%p\n", SMB_DIRINFO_SIZE, last_status,
                               server->packet_size, server->packet);
                        goto unlock_return;
                }
 
                /* 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);
                        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;
 
unlock_return:
        smb_unlock_server(server);
        return result;
}
 
void smb_decode_unix_basic(struct smb_fattr *fattr, char *p)
{
        /* 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 */
 
        fattr->f_size = LVAL(p, 0);
        fattr->f_blocks = LVAL(p, 8);
        fattr->f_ctime = smb_ntutc2unixutc(LVAL(p, 16));
        fattr->f_atime = smb_ntutc2unixutc(LVAL(p, 24));
        fattr->f_mtime = smb_ntutc2unixutc(LVAL(p, 32));
        fattr->f_uid = LVAL(p, 40);
        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);
        }
        fattr->f_mode |= LVAL(p, 84);
}
 
/*
 * 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)
{
        char *result;
        unsigned int len = 0;
        int n;
        __u16 date, time;
 
        /*
         * 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 = date_dos2unix(server, date, time);
 
                date = WVAL(p, 4);
                time = WVAL(p, 6);
                fattr->f_atime = date_dos2unix(server, date, time);
 
                date = WVAL(p, 8);
                time = WVAL(p, 10);
                fattr->f_mtime = date_dos2unix(server, date, time);
                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 */
                qname->name = p + 94;
                if (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, 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(server->name_buf, SMB_MAXNAMELEN,
                            qname->name, len,
                            server->remote_nls, server->local_nls);
        if (n > 0) {
                qname->len = n;
                qname->name = server->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_dentry;
        struct smb_sb_info *server = server_from_dentry(dir);
        struct qstr qname;
        struct smb_fattr fattr;
 
        unsigned char *p, *lastname;
        char *mask, *param = server->temp_buf;
        __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 char *resp_data = NULL;
        unsigned char *resp_param = NULL;
        int resp_data_len = 0;
        int resp_param_len = 0;
        int ff_searchcount = 0;
        int ff_eos = 0;
        int ff_lastname = 0;
        int ff_dir_handle = 0;
        int loop_count = 0;
        int mask_len, i, result;
        static struct qstr star = { "*", 1, 0 };
 
        /*
         * 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;
 
        smb_lock_server(server);
 
        /*
         * Encode the initial path
         */
        mask = param + 12;
 
        mask_len = smb_encode_path(server, mask, SMB_MAXPATHLEN+1, dir, &star);
        if (mask_len < 0) {
                result = mask_len;
                goto unlock_return;
        }
        mask_len--;     /* mask_len is strlen, not #bytes */
        first = 1;
        VERBOSE("starting mask_len=%d, mask=%s\n", mask_len, mask);
 
        result = 0;
        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);
 
                        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);
                }
 
                result = smb_trans2_request(server, command,
                                            0, NULL, 12 + mask_len + 1, param,
                                            &resp_data_len, &resp_data,
                                            &resp_param_len, &resp_param);
 
                if (result < 0) {
                        if (smb_retry(server)) {
                                PARANOIA("error=%d, retrying\n", result);
                                ctl->idx = -1;  /* retry */
                                result = 0;
                                goto unlock_return;
                        }
                        PARANOIA("error=%d, breaking\n", result);
                        break;
                }
 
                if (server->rcls == ERRSRV && server->err == ERRerror) {
                        /* a damn Win95 bug - sometimes it clags if you
                           ask it too fast */
                        current->state = TASK_INTERRUPTIBLE;
                        schedule_timeout(HZ/5);
                        continue;
                }
 
                if (server->rcls != 0) {
                        result = smb_errno(server);
                        PARANOIA("name=%s, result=%d, rcls=%d, err=%d\n",
                                 mask, result, server->rcls, server->err);
                        break;
                }
 
                /* parse out some important return info */
                if (first != 0) {
                        ff_dir_handle = WVAL(resp_param, 0);
                        ff_searchcount = WVAL(resp_param, 2);
                        ff_eos = WVAL(resp_param, 4);
                        ff_lastname = WVAL(resp_param, 8);
                } else {
                        ff_searchcount = WVAL(resp_param, 0);
                        ff_eos = WVAL(resp_param, 2);
                        ff_lastname = WVAL(resp_param, 6);
                }
 
                if (ff_searchcount == 0)
                        break;
 
                /*
                 * 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.
                 *
                 * All are happy if we return the data they point to. So we do.
                 */
                mask_len = 0;
                if (info_level != SMB_FIND_FILE_UNIX &&
                    ff_lastname > 0 && ff_lastname < resp_data_len) {
                        lastname = resp_data + ff_lastname;
 
                        switch (info_level) {
                        case 260:
                                mask_len = resp_data_len - ff_lastname;
                                break;
                        case 1:
                                /* lastname points to a length byte */
                                mask_len = *lastname++;
                                if (ff_lastname + 1 + mask_len > resp_data_len)
                                        mask_len = resp_data_len - ff_lastname - 1;
                                break;
                        }
 
                        /*
                         * Update the mask string for the next message.
                         */
                        if (mask_len < 0)
                                mask_len = 0;
                        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, resp_data_len, mask_len, mask);
 
                /* Now we are ready to parse smb directory entries. */
 
                /* point to the data bytes */
                p = resp_data;
                for (i = 0; i < ff_searchcount; i++) {
                        /* make sure we stay within the buffer */
                        if (p >= resp_data + resp_data_len) {
                                printk(KERN_ERR "smb_proc_readdir_long: "
                                       "dirent pointer outside buffer! "
                                       "%p  %d@%p  %d@%p\n",
                                       p, resp_data_len, resp_data,
                                       server->packet_size, server->packet);
                                result = -EIO; /* always a comm. error? */
                                goto unlock_return;
                        }
 
                        p = smb_decode_long_dirent(server, p, info_level,
                                                   &qname, &fattr);
                        if (qname.len == 0)
                                continue;
 
                        /* 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);
 
                first = 0;
                loop_count = 0;
        }
 
unlock_return:
        smb_unlock_server(server);
        return result;
}
 
/*
 * This version uses the trans2 TRANSACT2_FINDFIRST message
 * to get the attribute data.
 * Note: called with the server locked.
 *
 * Bugs Noted:
 */
static int
smb_proc_getattr_ff(struct smb_sb_info *server, struct dentry *dentry,
                        struct smb_fattr *fattr)
{
        char *param = server->temp_buf, *mask = param + 12;
        __u16 date, time;
        unsigned char *resp_data = NULL;
        unsigned char *resp_param = NULL;
        int resp_data_len = 0;
        int resp_param_len = 0;
        int mask_len, result;
 
retry:
        mask_len = smb_encode_path(server, mask, SMB_MAXPATHLEN+1, dentry, NULL);
        if (mask_len < 0) {
                result = mask_len;
                goto out;
        }
        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);
 
        result = smb_trans2_request(server, TRANSACT2_FINDFIRST,
                                    0, NULL, 12 + mask_len, param,
                                    &resp_data_len, &resp_data,
                                    &resp_param_len, &resp_param);
        if (result < 0)
        {
                if (smb_retry(server))
                        goto retry;
                goto out;
        }
        if (server->rcls != 0)
        {
                result = smb_errno(server);
#ifdef SMBFS_PARANOIA
                if (result != -ENOENT)
                        PARANOIA("error for %s, rcls=%d, err=%d\n",
                                 mask, server->rcls, server->err);
#endif
                goto out;
        }
        /* Make sure we got enough data ... */
        result = -EINVAL;
        if (resp_data_len < 22 || WVAL(resp_param, 2) != 1)
        {
                PARANOIA("bad result for %s, len=%d, count=%d\n",
                         mask, resp_data_len, WVAL(resp_param, 2));
                goto out;
        }
 
        /*
         * Decode the response into the fattr ...
         */
        date = WVAL(resp_data, 0);
        time = WVAL(resp_data, 2);
        fattr->f_ctime = date_dos2unix(server, date, time);
 
        date = WVAL(resp_data, 4);
        time = WVAL(resp_data, 6);
        fattr->f_atime = date_dos2unix(server, date, time);
 
        date = WVAL(resp_data, 8);
        time = WVAL(resp_data, 10);
        fattr->f_mtime = date_dos2unix(server, date, time);
        VERBOSE("name=%s, date=%x, time=%x, mtime=%ld\n",
                mask, date, time, fattr->f_mtime);
        fattr->f_size = DVAL(resp_data, 12);
        /* ULONG allocation size */
        fattr->attr = WVAL(resp_data, 20);
        result = 0;
 
out:
        return result;
}
 
/*
 * Note: called with the server locked.
 */
static int
smb_proc_getattr_core(struct smb_sb_info *server, struct dentry *dir,
                      struct smb_fattr *fattr)
{
        int result;
        char *p;
 
      retry:
        p = smb_setup_header(server, SMBgetatr, 0, 0);
        result = smb_simple_encode_path(server, &p, dir, NULL);
        if (result < 0)
                goto out;
        smb_setup_bcc(server, p);
 
        if ((result = smb_request_ok(server, SMBgetatr, 10, 0)) < 0)
        {
                if (smb_retry(server))
                        goto retry;
                goto out;
        }
        fattr->attr    = WVAL(server->packet, smb_vwv0);
        fattr->f_mtime = local2utc(server, DVAL(server->packet, smb_vwv1));
        fattr->f_size  = DVAL(server->packet, 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:
        return result;
}
 
/*
 * Note: called with the server locked.
 */
static int
smb_proc_getattr_trans2_all(struct smb_sb_info *server, struct dentry *dir,
                            struct smb_fattr *attr)
{
        char *p, *param = server->temp_buf;
        unsigned char *resp_data = NULL;
        unsigned char *resp_param = NULL;
        int resp_data_len = 0;
        int resp_param_len = 0;
        int result;
 
      retry:
        WSET(param, 0, SMB_QUERY_FILE_ALL_INFO);
        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;
 
        result = smb_trans2_request(server, TRANSACT2_QPATHINFO,
                                    0, NULL, p - param, param,
                                    &resp_data_len, &resp_data,
                                    &resp_param_len, &resp_param);
        if (result < 0) {
                if (smb_retry(server))
                        goto retry;
                goto out;
        }
        if (server->rcls != 0) {
                VERBOSE("for %s: result=%d, rcls=%d, err=%d\n",
                        &param[6], result, server->rcls, server->err);
                result = smb_errno(server);
                goto out;
        }
 
        result = -ENOENT;
        if (resp_data_len < 56) {
                PARANOIA("not enough data for %s, len=%d\n",
                         &param[6], resp_data_len);
                goto out;
        }
 
        attr->f_ctime = smb_ntutc2unixutc(LVAL(resp_data, 0));
        attr->f_atime = smb_ntutc2unixutc(LVAL(resp_data, 8));
        attr->f_mtime = smb_ntutc2unixutc(LVAL(resp_data, 16));
        /* change (24) */
        attr->attr = WVAL(resp_data, 32);
        /* pad? (34) */
        /* allocated size (40) */
        attr->f_size = LVAL(resp_data, 48);
        result = 0;
 
out:
        return result;
}
 
/*
 * Note: called with the server locked.
 *
 * Bugs Noted:
 * (1) Win 95 swaps the date and time fields in the standard info level.
 */
static int
smb_proc_getattr_trans2_std(struct smb_sb_info *server, struct dentry *dir,
                        struct smb_fattr *attr)
{
        char *p, *param = server->temp_buf;
        __u16 date, time;
        int off_date = 0, off_time = 2;
        unsigned char *resp_data = NULL;
        unsigned char *resp_param = NULL;
        int resp_data_len = 0;
        int resp_param_len = 0;
        int result;
 
      retry:
        WSET(param, 0, SMB_INFO_STANDARD);
        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;
 
        result = smb_trans2_request(server, TRANSACT2_QPATHINFO,
                                    0, NULL, p - param, param,
                                    &resp_data_len, &resp_data,
                                    &resp_param_len, &resp_param);
        if (result < 0)
        {
                if (smb_retry(server))
                        goto retry;
                goto out;
        }
        if (server->rcls != 0)
        {
                VERBOSE("for %s: result=%d, rcls=%d, err=%d\n",
                        &param[6], result, server->rcls, server->err);
                result = smb_errno(server);
                goto out;
        }
 
        result = -ENOENT;
        if (resp_data_len < 22)
        {
                PARANOIA("not enough data for %s, len=%d\n",
                         &param[6], resp_data_len);
                goto out;
        }
 
        /*
         * 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(resp_data, off_date);
        time = WVAL(resp_data, off_time);
        attr->f_ctime = date_dos2unix(server, date, time);
 
        date = WVAL(resp_data, 4 + off_date);
        time = WVAL(resp_data, 4 + off_time);
        attr->f_atime = date_dos2unix(server, date, time);
 
        date = WVAL(resp_data, 8 + off_date);
        time = WVAL(resp_data, 8 + off_time);
        attr->f_mtime = date_dos2unix(server, date, time);
#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(resp_data, 12);
        attr->attr = WVAL(resp_data, 20);
        result = 0;
 
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;
 
retry:
        result = smb_proc_getattr_trans2_std(server, dir, attr);
        if (result < 0) {
                if (server->rcls == ERRSRV && server->err == ERRerror) {
                        /* a damn Win95 bug - sometimes it clags if you
                           ask it too fast */
                        current->state = TASK_INTERRUPTIBLE;
                        schedule_timeout(HZ/5);
                        goto retry;
                }
                goto out;
        }
 
        /*
         * None of the other 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 && inode->u.smbfs_i.flags & SMB_F_LOCALWRITE &&
            smb_is_open(inode))
        {
                __u16 fileid = inode->u.smbfs_i.fileid;
                attr->f_size = smb_proc_seek(server, fileid, 2, 0);
        }
 
out:
        return result;
}
 
/*
 * Note: called with the server locked.
 */
static int
smb_proc_getattr_unix(struct smb_sb_info *server, struct dentry *dir,
                      struct smb_fattr *attr)
{
        char *p, *param = server->temp_buf;
        unsigned char *resp_data = NULL;
        unsigned char *resp_param = NULL;
        int resp_data_len = 0;
        int resp_param_len = 0;
        int result;
 
      retry:
        WSET(param, 0, SMB_QUERY_FILE_UNIX_BASIC);
        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;
 
        result = smb_trans2_request(server, TRANSACT2_QPATHINFO,
                                    0, NULL, p - param, param,
                                    &resp_data_len, &resp_data,
                                    &resp_param_len, &resp_param);
        if (result < 0) {
                if (smb_retry(server))
                        goto retry;
                goto out;
        }
        if (server->rcls != 0) {
                VERBOSE("for %s: result=%d, rcls=%d, err=%d\n",
                        &param[6], result, server->rcls, server->err);
                result = smb_errno(server);
                goto out;
        }
 
        smb_decode_unix_basic(attr, resp_data);
        result = 0;
 
out:
        return result;
}
 
static int
smb_proc_getattr_null(struct smb_sb_info *server, struct dentry *dir,
                      struct smb_fattr *attr)
{
        return -EIO;
}
 
int
smb_proc_getattr(struct dentry *dir, struct smb_fattr *fattr)
{
        struct smb_sb_info *server = server_from_dentry(dir);
        int result;
 
        smb_lock_server(server);
        smb_init_dirent(server, fattr);
        result = server->ops->getattr(server, dir, fattr);
        smb_finish_dirent(server, fattr);
        smb_unlock_server(server);
        return result;
}
 
 
/*
 * Called with the server locked. 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;
 
      retry:
        p = smb_setup_header(server, SMBsetatr, 8, 0);
        WSET(server->packet, smb_vwv0, attr);
        DSET(server->packet, smb_vwv1, 0); /* mtime */
        WSET(server->packet, smb_vwv3, 0); /* reserved values */
        WSET(server->packet, smb_vwv4, 0);
        WSET(server->packet, smb_vwv5, 0);
        WSET(server->packet, smb_vwv6, 0);
        WSET(server->packet, smb_vwv7, 0);
        result = smb_simple_encode_path(server, &p, dentry, NULL);
        if (result < 0)
                goto out;
        if (p + 2 > (char *)server->packet + server->packet_size) {
                result = -ENAMETOOLONG;
                goto out;
        }
        *p++ = 4;
        *p++ = 0;
        smb_setup_bcc(server, p);
 
        result = smb_request_ok(server, SMBsetatr, 0, 0);
        if (result < 0) {
                if (smb_retry(server))
                        goto retry;
                goto out;
        }
        result = 0;
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));
        smb_lock_server(server);
        result = smb_proc_setattr_core(server, dir, fattr->attr);
        smb_unlock_server(server);
        return result;
}
 
/*
 * Called with the server locked. 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;
 
      retry:
        smb_setup_header(server, SMBsetattrE, 7, 0);
        WSET(server->packet, smb_vwv0, inode->u.smbfs_i.fileid);
        /* We don't change the creation time */
        WSET(server->packet, smb_vwv1, 0);
        WSET(server->packet, smb_vwv2, 0);
        date_unix2dos(server, fattr->f_atime, &date, &time);
        WSET(server->packet, smb_vwv3, date);
        WSET(server->packet, smb_vwv4, time);
        date_unix2dos(server, fattr->f_mtime, &date, &time);
        WSET(server->packet, smb_vwv5, date);
        WSET(server->packet, 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
 
        result = smb_request_ok(server, SMBsetattrE, 0, 0);
        if (result < 0) {
                if (smb_retry(server))
                        goto retry;
                goto out;
        }
        result = 0;
out:
        return result;
}
 
/*
 * Note: called with the server locked.
 *
 * 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 = server->temp_buf;
        unsigned char *resp_data = NULL;
        unsigned char *resp_param = NULL;
        int resp_data_len = 0;
        int resp_param_len = 0;
        int result;
        char data[26];
 
      retry:
        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;
        p = param + 6 + result;
 
        WSET(data, 0, 0); /* creation time */
        WSET(data, 2, 0);
        date_unix2dos(server, fattr->f_atime, &date, &time);
        WSET(data, 4, date);
        WSET(data, 6, time);
        date_unix2dos(server, fattr->f_mtime, &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 */
 
        result = smb_trans2_request(server, TRANSACT2_SETPATHINFO,
                                    26, data, p - param, param,
                                    &resp_data_len, &resp_data,
                                    &resp_param_len, &resp_param);
        if (result < 0)
        {
                if (smb_retry(server))
                        goto retry;
                goto out;
        }
        result = 0;
        if (server->rcls != 0)
                result = smb_errno(server);
 
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 *dentry, struct iattr *attr,
                      unsigned int major, unsigned int minor)
{
        struct smb_sb_info *server = server_from_dentry(dentry);
        u64 nttime;
        char *p, *param;
        unsigned char *resp_data = NULL;
        unsigned char *resp_param = NULL;
        int resp_data_len = 0;
        int resp_param_len = 0;
        int result;
        char data[100];
 
        smb_lock_server(server);
        param = server->temp_buf;
 
        DEBUG1("valid flags = 0x%04x\n", attr->ia_valid);
 
retry:
        WSET(param, 0, SMB_SET_FILE_UNIX_BASIC);
        DSET(param, 2, 0);
        result = smb_encode_path(server, param + 6, SMB_MAXPATHLEN+1, dentry, NULL);
        if (result < 0)
                goto out;
        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);
        LSET(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);
        }
 
        result = smb_trans2_request(server, TRANSACT2_SETPATHINFO,
                                    sizeof(data), data, p - param, param,
                                    &resp_data_len, &resp_data,
                                    &resp_param_len, &resp_param);
        if (result < 0)
        {
                if (smb_retry(server))
                        goto retry;
                goto out;
        }
        result = 0;
        if (server->rcls != 0)
                result = smb_errno(server);
 
out:
        smb_unlock_server(server);
        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));
 
        smb_lock_server(server);
        /* 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) &&
                    inode->u.smbfs_i.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);
                        }
                }
        }
 
        smb_unlock_server(server);
        return result;
}
 
int
smb_proc_dskattr(struct super_block *sb, struct statfs *attr)
{
        struct smb_sb_info *server = &(sb->u.smbfs_sb);
        int result;
        char *p;
        long unit;
 
        smb_lock_server(server);
 
      retry:
        smb_setup_header(server, SMBdskattr, 0, 0);
 
        if ((result = smb_request_ok(server, SMBdskattr, 5, 0)) < 0) {
                if (smb_retry(server))
                        goto retry;
                goto out;
        }
        p = SMB_VWV(server->packet);
        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:
        smb_unlock_server(server);
        return result;
}
 
int
smb_proc_read_link(struct smb_sb_info *server, struct dentry *dentry,
                   char *buffer, int len)
{
        char *p, *param = server->temp_buf;
        unsigned char *resp_data = NULL;
        unsigned char *resp_param = NULL;
        int resp_data_len = 0;
        int resp_param_len = 0;
        int result;
 
        DEBUG1("readlink of %s/%s\n", DENTRY_PATH(dentry));
 
        smb_lock_server(server);
  retry:
        WSET(param, 0, SMB_QUERY_FILE_UNIX_LINK);
        DSET(param, 2, 0);
        result = smb_encode_path(server, param + 6, SMB_MAXPATHLEN+1, dentry, NULL);
        if (result < 0)
                goto out;
        p = param + 6 + result;
 
        result = smb_trans2_request(server, TRANSACT2_QPATHINFO,
                                    0, NULL, p - param, param,
                                    &resp_data_len, &resp_data,
                                    &resp_param_len, &resp_param);
        DEBUG1("for %s: result=%d, rcls=%d, err=%d\n",
                &param[6], result, server->rcls, server->err);
        if (result < 0) {
                if (smb_retry(server))
                        goto retry;
                goto out;
        }
        if (server->rcls != 0) {
                VERBOSE("for %s: result=%d, rcls=%d, err=%d\n",
                        &param[6], result, server->rcls, server->err);
                result = smb_errno(server);
                goto out;
        }
 
        /* copy data up to the \0 or buffer length */
        result = len;
        if (resp_data_len < len)
                result = resp_data_len;
        strncpy(buffer, resp_data, result);
 
out:
        smb_unlock_server(server);
        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 *dentry,
                 const char *oldpath)
{
        char *p, *param = server->temp_buf;
        unsigned char *resp_data = NULL;
        unsigned char *resp_param = NULL;
        int resp_data_len = 0;
        int resp_param_len = 0;
        int result;
 
        smb_lock_server(server);
  retry:
        WSET(param, 0, SMB_SET_FILE_UNIX_LINK);
        DSET(param, 2, 0);
        result = smb_encode_path(server, param + 6, SMB_MAXPATHLEN+1, dentry, NULL);
        if (result < 0)
                goto out;
        p = param + 6 + result;
 
        result = smb_trans2_request(server, TRANSACT2_SETPATHINFO,
                                    strlen(oldpath) + 1,
                                    (char *)oldpath, p - param, param,
                                    &resp_data_len, &resp_data,
                                    &resp_param_len, &resp_param);
        DEBUG1("for %s: result=%d, rcls=%d, err=%d\n",
                &param[6], result, server->rcls, server->err);
        if (result < 0) {
                if (smb_retry(server))
                        goto retry;
                goto out;
        }
        if (server->rcls != 0) {
                VERBOSE("for %s: result=%d, rcls=%d, err=%d\n",
                        &param[6], result, server->rcls, server->err);
                result = smb_errno(server);
                goto out;
        }
 
        result = 0;
 
out:
        smb_unlock_server(server);
        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 = server->temp_buf;
        unsigned char *resp_data = NULL;
        unsigned char *resp_param = NULL;
        int resp_data_len = 0;
        int resp_param_len = 0;
        int result;
        int newpathlen = 0;
        char newpath[SMB_MAXPATHLEN+1];         /* FIXME: ugh! */
 
        smb_lock_server(server);
 
        newpathlen = smb_encode_path(server, newpath, SMB_MAXPATHLEN+1, dentry, NULL);
 
        DEBUG1("newpathlen = %d newpath=\"%s\"\n", newpathlen, newpath);
retry:
        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;
        p = param + 6 + result;
        DEBUG1("pathlen = %d oldpath=\"%s\"\n", result, param + 6);
 
 
        result = smb_trans2_request(server, TRANSACT2_SETPATHINFO,
                                    newpathlen + 1,
                                    (char *)newpath, p - param, param,
                                    &resp_data_len, &resp_data,
                                    &resp_param_len, &resp_param);
        DEBUG1("for %s: result=%d, rcls=%d, err=%d\n",
               &param[6], result, server->rcls, server->err);
        if (result < 0) {
                if (smb_retry(server))
                        goto retry;
                goto out;
        }
        if (server->rcls != 0) {
                VERBOSE("for %s: result=%d, rcls=%d, err=%d\n",
                        &param[6], result, server->rcls, server->err);
                result = smb_errno(server);
                goto out;
        }
 
        result = 0;
 
out:
        smb_unlock_server(server);
        return result;
}
 
/*
 * We are called with the server locked
 */
static int
smb_proc_query_cifsunix(struct smb_sb_info *server)
{
        char *param = server->temp_buf;
        unsigned char *resp_data = NULL;
        unsigned char *resp_param = NULL;
        int resp_data_len = 0;
        int resp_param_len = 0;
        int result;
        int major, minor;
        u64 caps;
 
  retry:
        WSET(param, 0, SMB_QUERY_CIFS_UNIX_INFO);
        result = smb_trans2_request(server, TRANSACT2_QFSINFO,
                                    0, NULL, 2, param,
                                    &resp_data_len, &resp_data,
                                    &resp_param_len, &resp_param);
        if (result < 0) {
                if (smb_retry(server))
                        goto retry;
                goto out;
        }
 
        if (resp_data_len < 12) {
                PARANOIA("Not enough data\n");
                goto out;
        }
 
        major = WVAL(resp_data, 0);
        minor = WVAL(resp_data, 2);
        VERBOSE("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(resp_data, 4);
        DEBUG1("Server capabilities 0x%016llx\n", caps);
 
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,
        .truncate       = smb_proc_trunc64,
};
 
/* Place holder until real ops are in place */
static struct smb_ops smb_ops_null =
{
        .getattr        = smb_proc_getattr_null,
};
 
void smb_install_null_ops(struct smb_ops *ops)
{
        install_ops(ops, &smb_ops_null);
}
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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [fs/] [smbfs/] [proc.c] - Blame information for rev 1765

Line No.	Rev	Author	Line
1	1275	phoenix	`/*`
2			`* proc.c`
3			`*`
4			`* Copyright (C) 1995, 1996 by Paal-Kr. Engstad and Volker Lendecke`
5			`* Copyright (C) 1997 by Volker Lendecke`
6			`*`
7			`* Please add a note about your changes to smbfs in the ChangeLog file.`
8			`*/`
9
10			`#include <linux/types.h>`
11			`#include <linux/errno.h>`
12			`#include <linux/slab.h>`
13			`#include <linux/fs.h>`
14			`#include <linux/file.h>`
15			`#include <linux/stat.h>`
16			`#include <linux/fcntl.h>`
17			`#include <linux/dcache.h>`
18			`#include <linux/dirent.h>`
19			`#include <linux/nls.h>`
20
21			`#include <linux/smb_fs.h>`
22			`#include <linux/smbno.h>`
23			`#include <linux/smb_mount.h>`
24
25			`#include <asm/string.h>`
26			`#include <asm/div64.h>`
27
28			`#include "smb_debug.h"`
29			`#include "proto.h"`
30
31
32			`/* Features. Undefine if they cause problems, this should perhaps be a`
33			`config option. */`
34			`#define SMBFS_POSIX_UNLINK 1`
35
36			`#define SMB_VWV(packet) ((packet) + SMB_HEADER_LEN)`
37			`#define SMB_CMD(packet) (*(packet+8))`
38			`#define SMB_WCT(packet) (*(packet+SMB_HEADER_LEN - 1))`
39			`#define SMB_BCC(packet) smb_bcc(packet)`
40			`#define SMB_BUF(packet) ((packet) + SMB_HEADER_LEN + SMB_WCT(packet) * 2 + 2)`