/*
 *  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/malloc.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>

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

#include "smb_debug.h"

#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

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 int
smb_proc_do_getattr(struct dentry *dir, struct smb_fattr *fattr,
		    struct smb_sb_info *server);


static inline void
smb_lock_server(struct smb_sb_info *server)
{
	down(&(server->sem));
}

static inline void
smb_unlock_server(struct smb_sb_info *server)
{
	up(&(server->sem));
}


/* 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(char *output, int olen,
			  const char *input, int ilen,
			  struct nls_table *nls_from,
			  struct nls_table *nls_to)
{
	memcpy(output, input, ilen);
	return ilen;
}

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

	/* we don't need this, but we are a bit paranoid ... */
	if (!nls_from || !nls_to) {
		PARANOIA("nls_from=%p, nls_to=%p\n", nls_from, nls_to);
		return convert_memcpy(output, olen, input, ilen, NULL, NULL);
	}

	while (ilen > 0) {
		/* convert by changing to unicode and back to the new cp */
		n = -1;
		nls_from->char2uni((unsigned char *)input, &n, &cl, &ch);
		if (n < 0)
			goto out;
		input += n;
		ilen -= n;

		n = -1;
		nls_to->uni2char(ch, cl, output, olen, &n);
		if (n < 0)
			goto out;
		output += n;
		olen -= n;

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

static int setcodepage(struct smb_sb_info *server,
		       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;

	smb_lock_server(server);

	n = setcodepage(server, &server->local_nls, cp->local_name);
	if (n != 0)
		goto out;
	n = setcodepage(server, &server->remote_nls, cp->remote_name);
	if (n != 0)
		setcodepage(server, &server->local_nls, NULL);

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

	smb_unlock_server(server);
	return n;
}


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

__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_encode_path: build the path to entry and name storing it in buf.
 * The path returned will have the trailing '\0'.
 */
static int smb_encode_path(struct smb_sb_info *server, char * buf,
			   struct dentry * entry, struct qstr * name)
{
	char *path = buf;
	int len;

	if (entry == NULL)
		goto test_name_and_out;

	/*
	 * If IS_ROOT, we have to do no walking at all.
	 */
	if (IS_ROOT(entry)) {
		*(path++) = '\\';
		if (name != NULL)
			goto name_and_out;
		goto out;
	}

	/*
	 * Build the path string walking the tree backward from end to ROOT
	 * and store it in reversed order [see reverse_string()]
	 */
	for (;;) {
		if (entry->d_name.len > SMB_MAXNAMELEN)
			return -ENAMETOOLONG;
		if (path - buf + entry->d_name.len > SMB_MAXPATHLEN)
			return -ENAMETOOLONG;

		len = server->convert(path, SMB_MAXNAMELEN, 
				      entry->d_name.name, entry->d_name.len,
				      server->local_nls, server->remote_nls);
		reverse_string(path, len);
		path += len;

		*(path++) = '\\';

		entry = entry->d_parent;

		if (IS_ROOT(entry))
			break;
	}

	reverse_string(buf, path-buf);

test_name_and_out:
	if (name != NULL) {
		*(path++) = '\\';
name_and_out:
		len = server->convert(path, SMB_MAXNAMELEN, 
				      name->name, name->len,
				      server->local_nls, server->remote_nls);
		path += len;
	}
out:
	*(path++) = '\0';
	return (path-buf);
}

/* 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);

	/* Jan 1 GMT 00:00:00 1980. But what about another time zone? */
	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);
}

/*****************************************************************************/
/*                                                                           */
/*  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)
{
	int overhead = SMB_HEADER_LEN + 5 * 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)
{
	int overhead = SMB_HEADER_LEN + 5 * 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;
}

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:	/* Why is this mapped to 0?? */
			return 0;
		case ERRbadshare:
			return ETXTBSY;
		case ERRlock:
			return EDEADLK;
		case ERRfilexists:
			return EEXIST;
		case 87:		/* should this map to 0?? */
			return 0;	/* Unknown error!! */
		case 123:		/* Invalid name?? e.g. .tmp* */
			return ENOENT;
		case 145:		/* Win NT 4.0: non-empty directory? */
			return ENOTEMPTY;
			/* This next error seems to occur on an mv when
			 * the destination exists */
		case 183:
			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;
		default:
			class = "ERRHRD";
			goto err_unknown;
	} else if (errcls == ERRCMD)
		class = "ERRCMD";

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_INVALID)
		goto out;

	smb_close_socket(server);

	if (pid == 0) {
		printk(KERN_ERR "smb_retry: no connection process\n");
		server->state = CONN_RETRIED;
		goto out;
	}

	/*
	 * Clear the pid to enable the ioctl.
	 */
	server->conn_pid = 0;

	/*
	 * Note: use the "priv" flag, as a user process may need to reconnect.
	 */
	error = kill_proc(pid, SIGUSR1, 1);
	if (error) {
		printk(KERN_ERR "smb_retry: signal failed, error=%d\n", error);
		goto out_restore;
	}
	VERBOSE("signalled pid %d, waiting for new connection\n", pid);

	/*
	 * Wait for the new connection.
	 */
#ifdef SMB_RETRY_INTR
	interruptible_sleep_on_timeout(&server->wait,  5*HZ);
	if (signal_pending(current))
		printk(KERN_INFO "caught signal\n");
#else
	/*
	 * We don't want to be interrupted. For example, what if 'current'
	 * already has received a signal? sleep_on would terminate immediately
	 * and smbmount would not be able to re-establish connection.
	 *
	 * smbmount should be able to reconnect later, but it can't because
	 * it will get an -EIO on attempts to open the mountpoint!
	 */
	sleep_on_timeout(&server->wait, 5*HZ);
#endif

	/*
	 * Check for a valid connection.
	 */
	if (server->state == CONN_VALID) {
		PARANOIA("successful, new pid=%d, generation=%d\n",
			 server->conn_pid, server->generation);
		result = 1;
	}

	/*
	 * Restore the original pid if we didn't get a new one.
	 */
out_restore:
	if (!server->conn_pid)
		server->conn_pid = pid;

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.  The current smb_errno() routine
	 * is squashing some error codes, but I don't think this is
	 * correct: after a server error the packet won't be valid.
	 */
	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.
 *
 * Note that this must be called with the server locked, except for
 * the first call made after mounting the volume. The server pid
 * will be set to zero to indicate that smbfs is awaiting a connection.
 */
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);

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

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

	/*
	 * Support NT1 & LANMAN2, they are not that different and
	 * some people are still using LANMAN2 (OS/2)
	 */
	if (opt->protocol < SMB_PROTOCOL_LANMAN2) {
		printk(KERN_NOTICE "smbfs: protocols older than LANMAN2 are not"
		       " suppported [%d]\n", opt->protocol);
		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_NT1 &&
	    (server->opt.max_xmit < 0x1000) &&
	    !(server->opt.capabilities & SMB_CAP_NT_SMBS)) {
		server->mnt->flags |= SMB_MOUNT_WIN95;
#ifdef SMBFS_DEBUG_VERBOSE
		printk(KERN_NOTICE "smb_newconn: detected WIN95 server\n");
#endif
	}

	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) {
			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;
		}
	}

out:
#ifdef SMB_RETRY_INTR
	wake_up_interruptible(&server->wait);
#else
	wake_up(&server->wait);
#endif
	return error;

out_putf:
	fput(filp);
	goto out;
}

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

__u8 *
smb_setup_header(struct smb_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);

	*(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);
}

/*
 * 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. */
	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);
	*p++ = 4;
	res = smb_encode_path(server, p, dentry, NULL);
	if (res < 0)
		goto out;
	p += res;
	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;
	}

	/*
	 * Note: If the caller holds an active dentry and the file is
	 * currently open, we can be sure that the file isn't about
	 * to be closed. (See smb_close_dentry() below.)
	 */
	if (!smb_is_open(inode)) {
		struct smb_sb_info *server = SMB_SERVER(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 (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);
		ino->u.smbfs_i.cache_valid &= ~SMB_F_LOCALWRITE;
		/*
		 * Force a revalidation after closing 
		 */
		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 = SMB_SERVER(ino);
		smb_lock_server(server);
		result = smb_proc_close_inode(server, ino);
		smb_unlock_server(server);
	}
	return result;
}

/*
 * This routine is called from dput() when d_count is going to 0.
 * We use this to close the file so that cached dentries don't
 * keep too many files open.
 *
 * There are some tricky race conditions here: the dentry may go
 * back into use while we're closing the file, and we don't want
 * the new user to be confused as to the open status.
 */
void
smb_close_dentry(struct dentry * dentry)
{
	struct inode *ino = dentry->d_inode;

	if (ino)
	{
		if (smb_is_open(ino))
		{
			struct smb_sb_info *server = SMB_SERVER(ino);
			smb_lock_server(server);
			/*
			 * Check whether the dentry is back in use.
			 */
			if (dentry->d_count <= 1)
			{
				VERBOSE("closing %s/%s, count=%d\n",
					DENTRY_PATH(dentry), dentry->d_count);
				smb_proc_close_inode(server, ino);
			}
			smb_unlock_server(server);
		}
		VERBOSE("closed %s/%s, count=%d\n",
			DENTRY_PATH(dentry), dentry->d_count);
	}
}

/*
 * 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. */

int
smb_proc_read(struct dentry *dentry, off_t offset, int count, char *data)
{
	struct smb_sb_info *server = server_from_dentry(dentry);
	__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, dentry->d_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("file %s/%s, count=%d, result=%d\n",
		DENTRY_PATH(dentry), count, result);
	smb_unlock_server(server);
	return result;
}

int
smb_proc_write(struct dentry *dentry, off_t offset, int count, const char *data)
{
	struct smb_sb_info *server = server_from_dentry(dentry);
	int result;
	__u8 *p;

	VERBOSE("file %s/%s, count=%d@%ld, packet_size=%d\n",
		DENTRY_PATH(dentry), count, offset, server->packet_size);

	smb_lock_server(server);
	p = smb_setup_header(server, SMBwrite, 5, count + 3);
	WSET(server->packet, smb_vwv0, dentry->d_inode->u.smbfs_i.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;
}

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));
	*p++ = 4;
	result = smb_encode_path(server, p, dentry, NULL);
	if (result < 0)
		goto out;
	p += result;
	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);
	*p++ = 4;
	result = smb_encode_path(server, p, old_dentry, NULL);
	if (result < 0)
		goto out;
	p += result;
	*p++ = 4;
	result = smb_encode_path(server, p, new_dentry, NULL);
	if (result < 0)
		goto out;
	p += result;
	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);
	*p++ = 4;
	result = smb_encode_path(server, p, dentry, NULL);
	if (result < 0)
		goto out;
	p += result;
	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
/*
 * Note: called with the server locked.
 * removes readonly attribute from a file. Used by unlink to give posix semantics
 */
static int
smb_set_rw(struct dentry *dentry,struct smb_sb_info *server)
{
        int result;
        struct smb_fattr fattr;

        /* first get current attribute */

        result = smb_proc_do_getattr(dentry, &fattr, server);
        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);
	char *p;
        int flag = 0;
	int result;

	smb_lock_server(server);

retry:
	p = smb_setup_header(server, SMBunlink, 1, 0);
	WSET(server->packet, smb_vwv0, aSYSTEM | aHIDDEN);
	*p++ = 4;
	result = smb_encode_path(server, p, dentry, NULL);
	if (result < 0)
		goto out;
	p += result;
	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 */
                        result = smb_set_rw(dentry,server);
                        if (result == 0) {
                                flag = 1;
                                goto retry;                 /* and try again */
                        }
                }
#endif
		if (smb_retry(server))
			goto retry;
		goto out;
	}
	result = 0;
out:
	smb_unlock_server(server);
	return result;
}

int
smb_proc_trunc(struct smb_sb_info *server, __u16 fid, __u32 length)
{
	char *p;
	int result;

	smb_lock_server(server);

      retry:
	p = smb_setup_header(server, SMBwrite, 5, 3);
	WSET(server->packet, smb_vwv0, fid);
	WSET(server->packet, smb_vwv1, 0);
	DSET(server->packet, smb_vwv2, length);
	WSET(server->packet, smb_vwv4, 0);

	*p++ = 1;
	WSET(p, 0, 0);

	if ((result = smb_request_ok(server, SMBwrite, 1, 0)) < 0) {
		if (smb_retry(server))
			goto retry;
		goto out;
	}
	result = 0;
out:
	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 = 512;
}

static void
smb_finish_dirent(struct smb_sb_info *server, struct smb_fattr *fattr)
{
	fattr->f_mode = server->mnt->file_mode;
	if (fattr->attr & aDIR)
	{
		fattr->f_mode = server->mnt->dir_mode;
		fattr->f_size = 512;
	}
	/* Check the read-only flag */
	if (fattr->attr & aRONLY)
		fattr->f_mode &= ~(S_IWUSR | S_IWGRP | S_IWOTH);

	fattr->f_blocks = 0;
	if ((fattr->f_blksize != 0) && (fattr->f_size != 0))
	{
		fattr->f_blocks =
		    (fattr->f_size - 1) / fattr->f_blksize + 1;
	}
	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);
}


/*
 * Interpret a long filename structure using info level 260

 * We return a reference to the name string to avoid copying, and perform
 * any needed upper/lower casing in place.  

 * 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,
		       struct cache_dirent *entry, int level)
{
	char *result;
	unsigned int len = 0;

	/*
	 * SMB doesn't have a concept of inode numbers ...
	 */
	entry->ino = 0;

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

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

		VERBOSE("info 260 at %p, len=%d, name=%.*s\n",
			p, len, len, entry->name);
		break;
	default:
		PARANOIA("Unknown info level %d\n", level);
		result = p + WVAL(p, 0);
		goto out;
	}

	entry->len = server->convert(server->name_buf, SMB_MAXNAMELEN,
				     entry->name, len,
				     server->remote_nls, server->local_nls);
	entry->name = server->name_buf;
out:
	return result;
}

/*
 * 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.)
 */

#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)

static int
smb_proc_readdir_long(struct smb_sb_info *server, struct dentry *dir, int fpos,
		      void *cachep)
{
	unsigned char *p, *lastname;
	char *mask, *param = server->temp_buf;
	__u16 command;
	int first, entries, 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.protocol < SMB_PROTOCOL_NT1)
		info_level = 1;

	smb_lock_server(server);

retry:
	/*
	 * Encode the initial path
	 */
	mask = param + 12;
	mask_len = smb_encode_path(server, mask, dir, &star) - 1;
	if (mask_len < 0) {
		entries = mask_len;
		goto unlock_return;
	}
	first = 1;

	VERBOSE("starting fpos=%d, mask=%s\n", fpos, mask);

	/*
	 * We must reinitialize the dircache when retrying.
	 */
	smb_init_dircache(cachep);
	entries = 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");
			entries = -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, mask=%s\n",
				ff_dir_handle, 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);       	/* ff_resume_key */
			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);
				goto retry;
			}
			PARANOIA("error=%d, breaking\n", result);
			entries = 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) {
			PARANOIA("name=%s, entries=%d, rcls=%d, err=%d\n",
				 mask, entries, server->rcls, server->err);
			entries = -smb_errno(server);
			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.
		 */
		mask_len = 0;
		if (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[mask_len] = 0;
		mask_len = strlen(mask);	/* find the actual string len */


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

		/* point to the data bytes */
		p = resp_data;
		for (i = 0; i < ff_searchcount; i++) {
			struct cache_dirent this_ent, *entry = &this_ent;

			/* 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, entry,info_level);

			/* ignore . and .. from the server */
			if (entries_seen == 2 && entry->name[0] == '.') {
				if (entry->len == 1)
					continue;
				if (entry->name[1] == '.' && entry->len == 2)
					continue;
			}
			if (entries_seen >= fpos) {
				smb_add_to_cache(cachep, entry, entries_seen);
				entries += 1;
			}
 			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 entries;
}

int
smb_proc_readdir(struct dentry *dir, int fpos, void *cachep)
{
	struct smb_sb_info *server;

	server = server_from_dentry(dir);
	return smb_proc_readdir_long(server, dir, fpos, cachep);
}

/*
 * 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);
	*p++ = 4;
	result = smb_encode_path(server, p, dir, NULL);
	if (result < 0)
		goto out;
	p += result;
	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_ctime = local2utc(server, DVAL(server->packet, smb_vwv1));

	/* uggh. If its a directory then its a ctime, otherwise its a
	   mtime.  In order for the dircache to work with Win9X we
	   have to set the mtime to the current time for directories */
	if (fattr->attr & aDIR) {
		fattr->f_mtime = CURRENT_TIME;
	} else {
		fattr->f_mtime = fattr->f_ctime;
	}

	fattr->f_atime = fattr->f_mtime; 
	fattr->f_size  = DVAL(server->packet, smb_vwv3);
#ifdef SMBFS_DEBUG_TIMESTAMP
	printk(KERN_DEBUG "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.
 *
 * Bugs Noted:
 * (1) Win 95 swaps the date and time fields in the standard info level.
 */
static int
smb_proc_getattr_trans2(struct smb_sb_info *server, struct dentry *dir,
			struct smb_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, 1);	/* Info level SMB_INFO_STANDARD */
	DSET(param, 2, 0);
	p = param + 6;
	result = smb_encode_path(server, p, dir, NULL);
	if (result < 0)
		goto out;
	p += 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;
}

/*
 * Note: called with the server locked.
 *
 * get the file attribute
 */
static int
smb_proc_do_getattr(struct dentry *dir, struct smb_fattr *fattr,
		    struct smb_sb_info *server)
{
	int result;

	smb_init_dirent(server, fattr);

	/*
	 * Select whether to use core or trans2 getattr.
	 * Win 95 appears to break with the trans2 getattr.
	 */
	if (server->mnt->flags & SMB_MOUNT_WIN95) {
		result = smb_proc_getattr_core(server, dir, fattr);
	} else {
		result = smb_proc_getattr_trans2(server, dir, fattr);
	}

	smb_finish_dirent(server, fattr);
	return result;
}


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);
        result = smb_proc_do_getattr(dir, fattr, server);
	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);
	*p++ = 4;
	result = smb_encode_path(server, p, dentry, NULL);
	if (result < 0)
		goto out;
	p += result;
	*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);
	p = param + 6;
	result = smb_encode_path(server, p, dir, NULL);
	if (result < 0)
		goto out;
	p += 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;
}

/*
 * 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->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 error;
	char *p;

	smb_lock_server(server);

retry:
	smb_setup_header(server, SMBdskattr, 0, 0);

	if ((error = smb_request_ok(server, SMBdskattr, 5, 0)) < 0) {
		if (smb_retry(server))
			goto retry;
		goto out;
	}
	p = SMB_VWV(server->packet);
	attr->f_blocks = WVAL(p, 0);
	attr->f_bsize  = WVAL(p, 2) * WVAL(p, 4);
	attr->f_bavail = attr->f_bfree = WVAL(p, 6);
	error = 0;

out:
	smb_unlock_server(server);
	return error;
}

int
smb_proc_disconnect(struct smb_sb_info *server)
{
	int result;
	smb_lock_server(server);
	smb_setup_header(server, SMBtdis, 0, 0);
	result = smb_request_ok(server, SMBtdis, 0, 0);
	smb_unlock_server(server);
	return result;
}
