path: root/fs/ncpfs/dir.c

/*
 *  dir.c
 *
 *  Copyright (C) 1995, 1996 by Volker Lendecke
 *  Modified for big endian by J.F. Chadima and David S. Miller
 *  Modified 1997 Peter Waltenberg, Bill Hawes, David Woodhouse for 2.1 dcache
 *
 */

#include <linux/config.h>

#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/stat.h>
#include <linux/kernel.h>
#include <linux/malloc.h>
#include <linux/vmalloc.h>
#include <linux/mm.h>
#include <asm/uaccess.h>
#include <asm/byteorder.h>
#include <linux/errno.h>
#include <linux/locks.h>

#include <linux/ncp_fs.h>
#include "ncplib_kernel.h"

#ifndef shrink_dcache_parent
#define shrink_dcache_parent(dentry) shrink_dcache_sb((dentry)->d_sb)
#endif


struct ncp_dirent {
	struct nw_info_struct i;
	struct nw_search_sequence s;	/* given back for i */
	unsigned long f_pos;
};

static kdev_t c_dev = 0;
static unsigned long c_ino = 0;
static int c_size;
static int c_seen_eof;
static int c_last_returned_index;
static struct ncp_dirent *c_entry = NULL;
static int c_lock = 0;
static struct wait_queue *c_wait = NULL;

static int ncp_read_volume_list(struct ncp_server *, int, int,
					struct ncp_dirent *);
static int ncp_do_readdir(struct ncp_server *, struct dentry *, int, int,
					struct ncp_dirent *);

static ssize_t ncp_dir_read(struct file *, char *, size_t, loff_t *);
static int ncp_readdir(struct file *, void *, filldir_t);

static int ncp_create(struct inode *, struct dentry *, int);
static int ncp_lookup(struct inode *, struct dentry *);
static int ncp_unlink(struct inode *, struct dentry *);
static int ncp_mkdir(struct inode *, struct dentry *, int);
static int ncp_rmdir(struct inode *, struct dentry *);
static int ncp_rename(struct inode *, struct dentry *,
	  	      struct inode *, struct dentry *);

static struct file_operations ncp_dir_operations =
{
	NULL,			/* lseek - default */
	ncp_dir_read,		/* read - bad */
	NULL,			/* write - bad */
	ncp_readdir,		/* readdir */
	NULL,			/* poll - default */
	ncp_ioctl,		/* ioctl */
	NULL,			/* mmap */
	NULL,			/* no special open code */
	NULL,			/* no special release code */
	NULL			/* fsync */
};

struct inode_operations ncp_dir_inode_operations =
{
	&ncp_dir_operations,	/* default directory file ops */
	ncp_create,		/* create */
	ncp_lookup,		/* lookup */
	NULL,			/* link */
	ncp_unlink,		/* unlink */
	NULL,			/* symlink */
	ncp_mkdir,		/* mkdir */
	ncp_rmdir,		/* rmdir */
	NULL,			/* mknod */
	ncp_rename,		/* rename */
	NULL,			/* readlink */
	NULL,			/* follow link */
	NULL,			/* readpage */
	NULL,			/* writepage */
	NULL,			/* bmap */
	NULL,			/* truncate */
	NULL,			/* permission */
	NULL,			/* smap */
	NULL,			/* updatepage */
	NULL,			/* revalidate */
};

static ssize_t 
ncp_dir_read(struct file *filp, char *buf, size_t count, loff_t *ppos)
{
	return -EISDIR;
}

/*
 * Dentry operations routines
 */
static int ncp_lookup_validate(struct dentry *);
static int ncp_hash_dentry(struct dentry *, struct qstr *);
static int ncp_compare_dentry (struct dentry *, struct qstr *, struct qstr *);
static void ncp_delete_dentry(struct dentry *);

static struct dentry_operations ncp_dentry_operations =
{
	ncp_lookup_validate,	/* d_validate(struct dentry *) */
	ncp_hash_dentry,	/* d_hash */
	ncp_compare_dentry,    	/* d_compare */
	ncp_delete_dentry	/* d_delete(struct dentry *) */
};


/*
 * XXX: It would be better to use the tolower from linux/ctype.h,
 * but _ctype is needed and it is not exported.
 */
#define tolower(c) (((c) >= 'A' && (c) <= 'Z') ? (c)-('A'-'a') : (c))

/*
 * Note: leave the hash unchanged if the directory
 * is case-sensitive.
 */
static int 
ncp_hash_dentry(struct dentry *dentry, struct qstr *this)
{
	unsigned long hash;
	int i;

	if (!ncp_case_sensitive(dentry->d_inode)) {
		hash = init_name_hash();
		for (i=0; i<this->len ; i++)
			hash = partial_name_hash(tolower(this->name[i]),hash);
		this->hash = end_name_hash(hash);
	}
	return 0;
}

static int
ncp_compare_dentry(struct dentry *dentry, struct qstr *a, struct qstr *b)
{
	int i;

	if (a->len != b->len) return 1;

	if (ncp_case_sensitive(dentry->d_inode))
	    return strncmp(a->name, b->name, a->len);

	for (i=0; i<a->len; i++)
	  if (tolower(a->name[i]) != tolower(b->name[i]))
	    return 1;

	return 0;
}

/*
 * This is the callback from dput() when d_count is going to 0.
 * We use this to unhash dentries with bad inodes and close files.
 */
static void
ncp_delete_dentry(struct dentry * dentry)
{
	struct inode *inode = dentry->d_inode;

	if (inode)
	{
		if (is_bad_inode(inode))
		{
			d_drop(dentry);
		}
		/*
		 * Lock the superblock, then recheck the dentry count.
		 * (Somebody might have used it again ...)
		 */
		if (dentry->d_count == 1 && NCP_FINFO(inode)->opened) {
#ifdef NCPFS_PARANOIA
printk(KERN_DEBUG "ncp_delete_dentry: closing file %s/%s\n",
dentry->d_parent->d_name.name, dentry->d_name.name);
#endif
			ncp_make_closed(inode);
		}
	} else
	{
	/* N.B. Unhash negative dentries? */
	}
}

/* Here we encapsulate the inode number handling that depends upon the
 * mount mode: When we mount a complete server, the memory address of
 * the ncp_inode_info is used as the inode number. When only a single
 * volume is mounted, then the dirEntNum is used as the inode
 * number. As this is unique for the complete volume, this should
 * enable the NFS exportability of a ncpfs-mounted volume.
 */

/*
 * Generate a unique inode number.
 */
ino_t ncp_invent_inos(unsigned long n)
{
	static ino_t ino = 2;

	if (ino + 2*n < ino)
	{
		/* wrap around */
		ino = 2;
	}
	ino += n;
	return ino;
}

static inline int
ncp_single_volume(struct ncp_server *server)
{
	return (server->m.mounted_vol[0] != '\0');
}

static inline int ncp_is_server_root(struct inode *inode)
{
	return (!ncp_single_volume(NCP_SERVER(inode)) &&
		inode == inode->i_sb->s_root->d_inode);
}

static inline void ncp_lock_dircache(void)
{
	while (c_lock)
		sleep_on(&c_wait);
	c_lock = 1;
}

static inline void ncp_unlock_dircache(void)
{
	c_lock = 0;
	wake_up(&c_wait);
}


/*
 * This is the callback when the dcache has a lookup hit.
 */


#ifdef CONFIG_NCPFS_STRONG
/* try to delete a readonly file (NW R bit set) */

static int
ncp_force_unlink(struct inode *dir, struct dentry* dentry)
{
        int res=0x9c,res2;
        struct iattr ia;

        /* remove the Read-Only flag on the NW server */

        memset(&ia,0,sizeof(struct iattr));
        ia.ia_mode = dentry->d_inode->i_mode;
        ia.ia_mode |= NCP_SERVER(dir)->m.file_mode & 0222;  /* set write bits */
        ia.ia_valid = ATTR_MODE;

        res2=ncp_notify_change(dentry, &ia);
        if (res2)
        {
                goto leave_me;
        }

        /* now try again the delete operation */

        res = ncp_del_file_or_subdir2(NCP_SERVER(dir), dentry);

        if (res)  /* delete failed, set R bit again */
        {
                memset(&ia,0,sizeof(struct iattr));
                ia.ia_mode = dentry->d_inode->i_mode;
                ia.ia_mode &= ~(NCP_SERVER(dir)->m.file_mode & 0222);  /* clear write bits */
                ia.ia_valid = ATTR_MODE;

                res2=ncp_notify_change(dentry, &ia);
                if (res2)
                {
                        goto leave_me;
                }
        }
leave_me:
        return(res);
}
#endif	/* CONFIG_NCPFS_STRONG */

#ifdef CONFIG_NCPFS_STRONG
static int
ncp_force_rename(struct inode *old_dir, struct dentry* old_dentry, char *_old_name,
                 struct inode *new_dir, struct dentry* new_dentry, char *_new_name)
{
        int res=0x90,res2;
        struct iattr ia;

        /* remove the Read-Only flag on the NW server */

        memset(&ia,0,sizeof(struct iattr));
        ia.ia_mode = old_dentry->d_inode->i_mode;
        ia.ia_mode |= NCP_SERVER(old_dir)->m.file_mode & 0222;  /* set write bits */
        ia.ia_valid = ATTR_MODE;

        res2=ncp_notify_change(old_dentry, &ia);
        if (res2)
        {
                goto leave_me;
        }

        /* now try again the rename operation */
        res = ncp_ren_or_mov_file_or_subdir(NCP_SERVER(old_dir),
                                            old_dir, _old_name,
                                            new_dir, _new_name);

        memset(&ia,0,sizeof(struct iattr));
        ia.ia_mode = old_dentry->d_inode->i_mode;
        ia.ia_mode &= ~(NCP_SERVER(old_dentry->d_inode)->m.file_mode & 0222);  /* clear write bits */
        ia.ia_valid = ATTR_MODE;

	/* FIXME: uses only inode info, no dentry info... so it is safe to call */
	/* it now with old dentry. If we use name (in future), we have to move */
	/* it after dentry_move in caller */
        res2=ncp_notify_change(old_dentry, &ia);
        if (res2)
        {
                printk(KERN_INFO "ncpfs: ncp_notify_change (2) failed: %08x\n",res2);
                goto leave_me;
        }

 leave_me:
        return(res);
}
#endif	/* CONFIG_NCPFS_STRONG */


static int
ncp_lookup_validate(struct dentry * dentry)
{
	struct ncp_server *server;
	struct inode *dir = dentry->d_parent->d_inode;
	int down_case = 0;
	int val = 0,res;
	int len = dentry->d_name.len;      
	struct ncpfs_inode_info finfo;
	__u8 __name[dentry->d_name.len + 1];

        if (!dentry->d_inode) {
                DPRINTK(KERN_DEBUG "ncp_lookup_validate: called with dentry->d_inode already NULL.\n");
                return 0;
        }
        
	if (!dir || !S_ISDIR(dir->i_mode)) {
		printk(KERN_WARNING "ncp_lookup_validate: inode is NULL or not a directory.\n");
		goto finished;
	}
	server = NCP_SERVER(dir);

	if (!ncp_conn_valid(server))
		goto finished;

	strncpy(__name, dentry->d_name.name, len);
	__name[len] = '\0';
#ifdef NCPFS_PARANOIA
printk(KERN_DEBUG "ncp_lookup_validate: %s, len %d\n", __name, len);
#endif

	if (!ncp_preserve_case(dir)) { 
	  str_lower(__name);
          down_case = 1;
	}
	
	/* If the file is in the dir cache, we do not have to ask the
	   server. */

#ifdef NCPFS_PARANOIA
printk(KERN_DEBUG "ncp_lookup_validate: server lookup for %s/%s\n",
dentry->d_parent->d_name.name, __name);
#endif
		if (ncp_is_server_root(dir))
		{
			str_upper(__name);
			down_case = 1;
			res = ncp_lookup_volume(server, __name,
						&(finfo.nw_info.i));
		} else
	    	{
			if (!ncp_preserve_case(dir))
			{
				str_upper(__name);
				down_case = 1;
			}
			res = ncp_obtain_info(server, dir, __name,
						&(finfo.nw_info.i));
		}
#ifdef NCPFS_PARANOIA
printk(KERN_DEBUG "ncp_lookup_validate: looked for %s/%s, res=%d\n",
dentry->d_parent->d_name.name, __name, res);
#endif
		/*
		 * If we didn't find it, or if it has a different dirEntNum to
		 * what we remember, it's not valid any more.
		 */
	   	if (!res) {
		  if (finfo.nw_info.i.dirEntNum == NCP_FINFO(dentry->d_inode)->dirEntNum)
		    val=1;
#ifdef NCPFS_PARANOIA
		  else
		    printk(KERN_DEBUG "ncp_lookup_validate: found, but dirEntNum changed\n");
#endif
 		  ncp_update_inode2(dentry->d_inode, &finfo.nw_info);
		}
		if (!val) ncp_invalid_dir_cache(dir);

finished:
#ifdef NCPFS_PARANOIA
printk(KERN_DEBUG "ncp_lookup_validate: result=%d\n", val);
#endif

	return val;
}


static int ncp_readdir(struct file *filp, void *dirent, filldir_t filldir)
{
	struct dentry *dentry = filp->f_dentry;
	struct inode *inode = dentry->d_inode;
	struct ncp_server *server = NCP_SERVER(inode);
	struct ncp_dirent *entry = NULL;
	int result, i, index = 0;

	DDPRINTK(KERN_DEBUG "ncp_readdir: reading %s/%s, pos=%d\n",
		dentry->d_parent->d_name.name, dentry->d_name.name,
		(int) filp->f_pos);
	DDPRINTK(KERN_DEBUG "ncp_readdir: inode->i_ino = %ld, c_ino = %ld\n",
		 inode->i_ino, c_ino);

	result = -EBADF;
	if (!inode || !S_ISDIR(inode->i_mode)) {
		printk(KERN_WARNING "ncp_readdir: inode is NULL or not a directory\n");
		goto out;
	}
	result = -EIO;
	if (!ncp_conn_valid(server))
		goto out;

	ncp_lock_dircache();
	result = -ENOMEM;
	if (c_entry == NULL) {
		i = sizeof(struct ncp_dirent) * NCP_READDIR_CACHE_SIZE;
		c_entry = (struct ncp_dirent *) vmalloc(i);
		if (c_entry == NULL) {
			printk(KERN_WARNING "ncp_readdir: no MEMORY for cache\n");
			goto finished;
		}
	}

	result = 0;
	if (filp->f_pos == 0) {
		ncp_invalid_dir_cache(inode);
		if (filldir(dirent, ".", 1, 0, inode->i_ino) < 0) {
			goto finished;
		}
		filp->f_pos = 1;
	}
	if (filp->f_pos == 1) {
		if (filldir(dirent, "..", 2, 1,
				dentry->d_parent->d_inode->i_ino) < 0) {
			goto finished;
		}
		filp->f_pos = 2;
	}

	if ((inode->i_dev == c_dev) && (inode->i_ino == c_ino)) {
		for (i = 0; i < c_size; i++) {
			if (filp->f_pos == c_entry[i].f_pos) {
				entry = &c_entry[i];
				c_last_returned_index = i;
				index = i;
				break;
			}
		}
		if ((entry == NULL) && c_seen_eof) {
			goto finished;
		}
	}
	if (entry == NULL) {
		int entries;
		DDPRINTK(KERN_DEBUG "ncp_readdir: Not found in cache.\n");

		if (ncp_is_server_root(inode)) {
			entries = ncp_read_volume_list(server, filp->f_pos,
					 NCP_READDIR_CACHE_SIZE, c_entry);
			DPRINTK(KERN_DEBUG "ncp_read_volume_list returned %d\n", entries);

		} else {
			entries = ncp_do_readdir(server, dentry, filp->f_pos,
					 NCP_READDIR_CACHE_SIZE, c_entry);
			DPRINTK(KERN_DEBUG "ncp_readdir: returned %d\n", entries);
		}

		if (entries < 0) {
			c_dev = 0;
			c_ino = 0;
			result = entries;
			goto finished;
		}
		if (entries > 0) {
			c_seen_eof = (entries < NCP_READDIR_CACHE_SIZE);
			c_dev = inode->i_dev;
			c_ino = inode->i_ino;
			c_size = entries;
			entry = c_entry;
			c_last_returned_index = 0;
			index = 0;

			if (!ncp_preserve_case(inode)) {
				for (i = 0; i < c_size; i++) {
					str_lower(c_entry[i].i.entryName);
				}
			}
		}
	}
	if (entry == NULL) {
		/* Nothing found, even from a ncp call */
		goto finished;
	}

	while (index < c_size) {
		ino_t ino;
		struct qstr qname;

		DDPRINTK(KERN_DEBUG "ncp_readdir: entry->path= %s\n", entry->i.entryName);
		DDPRINTK(KERN_DEBUG "ncp_readdir: entry->f_pos = %ld\n", entry->f_pos);

		/* For getwd() we have to return the correct
		 * inode in d_ino if the inode is currently in
		 * use. Otherwise the inode number does not
		 * matter. (You can argue a lot about this..)
		 */
		qname.name = entry->i.entryName;
		qname.len  = entry->i.nameLen;
		ino = find_inode_number(dentry, &qname);
		if (!ino)
			ino = ncp_invent_inos(1);

		if (filldir(dirent, entry->i.entryName, entry->i.nameLen,
			    entry->f_pos, ino) < 0) {
			break;
		}
		if ((inode->i_dev != c_dev)
		    || (inode->i_ino != c_ino)
		    || (entry->f_pos != filp->f_pos)) {
			/* Someone has destroyed the cache while we slept
			   in filldir */
			break;
		}
		filp->f_pos += 1;
		index += 1;
		entry += 1;
	}
      finished:
	ncp_unlock_dircache();
out:
	return result;
}

static int 
ncp_read_volume_list(struct ncp_server *server, int fpos,
			 int cache_size, struct ncp_dirent *entry)
{
	int i, total_count = 2;
	struct ncp_volume_info info;

	DPRINTK(KERN_DEBUG "ncp_read_volume_list: pos=%d\n", fpos);
#if 1
	if (fpos < 2) {
		printk(KERN_ERR "OOPS, we expect fpos >= 2");
		fpos = 2;
	}
#endif

	for (i = 0; i < NCP_NUMBER_OF_VOLUMES; i++) {

		if (ncp_get_volume_info_with_number(server, i, &info) != 0)
			goto out;
		if (!strlen(info.volume_name))
			continue;

		if (total_count < fpos) {
			DPRINTK(KERN_DEBUG "ncp_read_volume_list: skipped vol: %s\n",
				info.volume_name);
		} else if (total_count >= fpos + cache_size) {
			goto out;
		} else {
			DPRINTK(KERN_DEBUG "ncp_read_volume_list: found vol: %s\n",
				info.volume_name);

			if (ncp_lookup_volume(server, info.volume_name,
					      &(entry->i)) != 0) {
				DPRINTK(KERN_DEBUG "ncpfs: could not lookup vol %s\n",
					info.volume_name);
				continue;
			}
			entry->f_pos = total_count;
			entry += 1;
		}
		total_count += 1;
	}
out:
	return (total_count - fpos);
}

static int ncp_do_readdir(struct ncp_server *server, struct dentry *dentry,
			int fpos, int cache_size, struct ncp_dirent *entry)
{
	struct inode *dir = dentry->d_inode;
	static struct inode *last_dir;
	static int total_count;
	static struct nw_search_sequence seq;
	int err;

#if 1
	if (fpos < 2) {
		printk(KERN_ERR "OOPS, we expect fpos >= 2");
		fpos = 2;
	}
#endif
	DPRINTK(KERN_DEBUG "ncp_do_readdir: %s/%s, fpos=%d\n",
		dentry->d_parent->d_name.name, dentry->d_name.name, fpos);

	if (fpos == 2) {
		last_dir = NULL;
		total_count = 2;
	}
	if ((fpos != total_count) || (dir != last_dir))
	{
		total_count = 2;
		last_dir = dir;
		
#ifdef NCPFS_PARANOIA
printk(KERN_DEBUG "ncp_do_readdir: init %s, volnum=%d, dirent=%u\n",
dentry->d_name.name, NCP_FINFO(dir)->volNumber, NCP_FINFO(dir)->dirEntNum);
#endif
		err = ncp_initialize_search(server, dir, &seq); 
		if (err)
		{
			DPRINTK(KERN_DEBUG "ncp_do_readdir: init failed, err=%d\n", err);
			goto out;
		}
	}

	while (total_count < fpos + cache_size) {
		err = ncp_search_for_file_or_subdir(server, &seq, &(entry->i));
		if (err) {
			DPRINTK(KERN_DEBUG "ncp_do_readdir: search failed, err=%d\n", err);
			goto out;
		}
		if (total_count < fpos) {
			DPRINTK(KERN_DEBUG "ncp_do_readdir: skipped file: %s/%s\n",
				dentry->d_name.name, entry->i.entryName);
		} else {
			DDPRINTK(KERN_DEBUG "ncp_do_r: file: %s, f_pos=%d,total_count=%d",
				entry->i.entryName, fpos, total_count);
			entry->s = seq;
			entry->f_pos = total_count;
			entry += 1;
		}
		total_count += 1;
	}
out:
	return (total_count - fpos);
}

void ncp_init_dir_cache(void)
{
	c_dev = 0;
	c_ino = 0;
	c_entry = NULL;
}

void ncp_invalid_dir_cache(struct inode *ino)
{
	if ((ino->i_dev == c_dev) && (ino->i_ino == c_ino)) {
		c_dev = 0;
		c_ino = 0;
		c_seen_eof = 0;
	}
}

void ncp_free_dir_cache(void)
{
	DPRINTK(KERN_DEBUG "ncp_free_dir_cache: enter\n");

	if (c_entry == NULL) {
		return;
	}
	vfree(c_entry);
	c_entry = NULL;

	DPRINTK(KERN_DEBUG "ncp_free_dir_cache: exit\n");
}

int ncp_conn_logged_in(struct ncp_server *server)
{
	int result;

	if (ncp_single_volume(server)) {
		struct dentry* dent;

		result = -ENOENT;
		str_upper(server->m.mounted_vol);
		if (ncp_lookup_volume(server, server->m.mounted_vol,
				      &(server->root.finfo.i)) != 0) {
#ifdef NCPFS_PARANOIA
printk(KERN_DEBUG "ncp_conn_logged_in: %s not found\n", server->m.mounted_vol);
#endif
			goto out;
		}
		str_lower(server->root.finfo.i.entryName);
		dent = server->root_dentry;
		if (dent) {
			struct inode* ino = dent->d_inode;
			if (ino) {
				NCP_FINFO(ino)->volNumber = server->root.finfo.i.volNumber;
				NCP_FINFO(ino)->dirEntNum = server->root.finfo.i.dirEntNum;
				NCP_FINFO(ino)->DosDirNum = server->root.finfo.i.DosDirNum;
			} else {
				DPRINTK(KERN_DEBUG "ncpfs: sb->root_dentry->d_inode == NULL!\n");
			}
		} else {
			DPRINTK(KERN_DEBUG "ncpfs: sb->root_dentry == NULL!\n");
		}
	}
	result = 0;

out:
	return result;
}

static int ncp_lookup(struct inode *dir, struct dentry *dentry)
{
	struct ncp_server *server;
	struct inode *inode = NULL;
	int found_in_cache, down_case = 0;
	int error;
	int len = dentry->d_name.len;      
	struct ncpfs_inode_info finfo;
	__u8 __name[dentry->d_name.len + 1];
      
	error =  -ENOENT;
	if (!dir || !S_ISDIR(dir->i_mode)) {
		printk(KERN_WARNING "ncp_lookup: inode is NULL or not a directory.\n");
		goto finished;
	}
	server = NCP_SERVER(dir);

	error = -EIO;
	if (!ncp_conn_valid(server))
		goto finished;

	strncpy(__name, dentry->d_name.name, len);
	__name[len] = '\0';
#ifdef NCPFS_PARANOIA
printk(KERN_DEBUG "ncp_lookup: %s, len %d\n", __name, len);
#endif

	if (!ncp_preserve_case(dir)) { 
	  str_lower(__name);
          down_case = 1;
	}
	
	/* If the file is in the dir cache, we do not have to ask the
	   server. */

	found_in_cache = 0;
	ncp_lock_dircache();

	if ((dir->i_dev == c_dev) && (dir->i_ino == c_ino))
	{
		int first = c_last_returned_index;
		int i;
	    
		i = first;
		do {
#ifdef NCPFS_PARANOIA
printk(KERN_DEBUG "ncp_lookup: trying index: %d, name: %s\n", i, c_entry[i].i.entryName);
#endif
			if (strcmp(c_entry[i].i.entryName, __name) == 0) {
#ifdef NCPFS_PARANOIA
printk(KERN_DEBUG "ncp_lookup: found in cache!\n");
#endif
				finfo.nw_info.i = c_entry[i].i;
				found_in_cache = 1;
				break;
			}
			i = (i + 1) % c_size;
		} while (i != first);
	}
	ncp_unlock_dircache();

	if (found_in_cache == 0)
	{
		int res;
	    
#ifdef NCPFS_PARANOIA
printk(KERN_DEBUG "ncp_lookup: server lookup for %s/%s\n",
dentry->d_parent->d_name.name, __name);
#endif
		if (ncp_is_server_root(dir))
		{
			str_upper(__name);
			down_case = 1;
			res = ncp_lookup_volume(server, __name,
						&(finfo.nw_info.i));
		} else
	    	{
			if (!ncp_preserve_case(dir))
			{
				str_upper(__name);
				down_case = 1;
			}
			res = ncp_obtain_info(server, dir, __name,
						&(finfo.nw_info.i));
		}
#ifdef NCPFS_PARANOIA
printk(KERN_DEBUG "ncp_lookup: looked for %s/%s, res=%d\n",
dentry->d_parent->d_name.name, __name, res);
#endif
		/*
		 * If we didn't find an entry, make a negative dentry.
		 */
	   	if (res != 0)
			goto add_entry;
	}

	/*
	 * Create an inode for the entry.
	 */
	finfo.nw_info.opened = 0;
	finfo.ino = ncp_invent_inos(1);
	error = -EACCES;
	inode = ncp_iget(dir->i_sb, &finfo);
	if (inode)
	{
	add_entry:
		dentry->d_op = &ncp_dentry_operations;
		d_add(dentry, inode);
		error = 0;
	}

finished:
#ifdef NCPFS_PARANOIA
printk(KERN_DEBUG "ncp_lookup: result=%d\n", error);
#endif
	return error;
}

/*
 * This code is common to create, mkdir, and mknod.
 */
static int ncp_instantiate(struct inode *dir, struct dentry *dentry,
			struct ncpfs_inode_info *finfo)
{
	struct inode *inode;
	int error = -EINVAL;

	ncp_invalid_dir_cache(dir);

	finfo->ino = ncp_invent_inos(1);
	inode = ncp_iget(dir->i_sb, finfo);
	if (!inode)
		goto out_close;
	d_instantiate(dentry,inode);
	error = 0;
out:
	return error;

out_close:
#ifdef NCPFS_PARANOIA
printk(KERN_DEBUG "ncp_instantiate: %s/%s failed, closing file\n",
dentry->d_parent->d_name.name, dentry->d_name.name);
#endif
	ncp_close_file(NCP_SERVER(dir), finfo->nw_info.file_handle);
	goto out;
}

static int ncp_create(struct inode *dir, struct dentry *dentry, int mode)
{
	int error, result;
	struct ncpfs_inode_info finfo;
	__u8 _name[dentry->d_name.len + 1];

#ifdef NCPFS_PARANOIA
printk(KERN_DEBUG "ncp_create: creating %s/%s, mode=%x\n",
dentry->d_parent->d_name.name, dentry->d_name.name, mode);
#endif
	if (!dir || !S_ISDIR(dir->i_mode)) {
		printk(KERN_WARNING "ncp_create: inode is NULL or not a directory\n");
		return -ENOENT;
	}
	error = -EIO;
	if (!ncp_conn_valid(NCP_SERVER(dir)))
		goto out;

	strncpy(_name, dentry->d_name.name, dentry->d_name.len);
	_name[dentry->d_name.len] = '\0';

	if (!ncp_preserve_case(dir)) {
		str_upper(_name);
	}

	error = -EACCES;
	result = ncp_open_create_file_or_subdir(NCP_SERVER(dir), dir, _name,
			   OC_MODE_CREATE | OC_MODE_OPEN | OC_MODE_REPLACE,
			   0, AR_READ | AR_WRITE, &finfo.nw_info);
	if (!result) {
		finfo.nw_info.access = O_RDWR;
		error = ncp_instantiate(dir, dentry, &finfo);
	} else {
		if (result == 0x87) error = -ENAMETOOLONG;
		DPRINTK(KERN_DEBUG "ncp_create: %s/%s failed\n",
			dentry->d_parent->d_name.name, dentry->d_name.name);
	}

out:
	return error;
}

static int ncp_mkdir(struct inode *dir, struct dentry *dentry, int mode)
{
	int error;
	struct ncpfs_inode_info finfo;
	__u8 _name[dentry->d_name.len + 1];

	DPRINTK(KERN_DEBUG "ncp_mkdir: making %s/%s\n",
		dentry->d_parent->d_name.name, dentry->d_name.name);
	error = -ENOTDIR;
	if (!dir || !S_ISDIR(dir->i_mode)) {
		printk(KERN_WARNING "ncp_mkdir: inode is NULL or not a directory\n");
		goto out;
	}
	error = -EIO;
	if (!ncp_conn_valid(NCP_SERVER(dir)))
		goto out;

	strncpy(_name, dentry->d_name.name, dentry->d_name.len);
	_name[dentry->d_name.len] = '\0';
	if (!ncp_preserve_case(dir)) {
		str_upper(_name);
	}

	error = -EACCES;
	if (ncp_open_create_file_or_subdir(NCP_SERVER(dir), dir, _name,
					   OC_MODE_CREATE, aDIR, 0xffff,
					   &finfo.nw_info) == 0)
	{
		error = ncp_instantiate(dir, dentry, &finfo);
	}
out:
	return error;
}

static int ncp_rmdir(struct inode *dir, struct dentry *dentry)
{
	int error, result;
	__u8 _name[dentry->d_name.len + 1];

	DPRINTK(KERN_DEBUG "ncp_rmdir: removing %s/%s\n",
		dentry->d_parent->d_name.name, dentry->d_name.name);
	
	error = -ENOENT;
	if (!dir || !S_ISDIR(dir->i_mode))
	{
		printk(KERN_WARNING "ncp_rmdir: inode is NULL or not a directory\n");
		goto out;
	}
	error = -EIO;
	if (!ncp_conn_valid(NCP_SERVER(dir)))
		goto out;

	if (dentry->d_count > 1)
	{
		shrink_dcache_parent(dentry);
		error = -EBUSY;
		if (dentry->d_count > 1)
			goto out;
	}

	strncpy(_name, dentry->d_name.name, dentry->d_name.len);
	_name[dentry->d_name.len] = '\0';
	    
	if (!ncp_preserve_case(dir))
	{
		str_upper(_name);
	}
	error = -EACCES;
	result = ncp_del_file_or_subdir(NCP_SERVER(dir), dir, _name);
	if (!result)
	{
		ncp_invalid_dir_cache(dir);
		d_delete(dentry);
		error = 0;
    	}
out:
	return error;
}

static int ncp_unlink(struct inode *dir, struct dentry *dentry)
{
	struct inode *inode = dentry->d_inode;
	int error;

	DPRINTK(KERN_DEBUG "ncp_unlink: unlinking %s/%s\n",
		dentry->d_parent->d_name.name, dentry->d_name.name);
	
	error = -ENOTDIR;
	if (!dir || !S_ISDIR(dir->i_mode)) {
		printk(KERN_WARNING "ncp_unlink: inode is NULL or not a directory\n");
		goto out;
	}
	error = -EIO;
	if (!ncp_conn_valid(NCP_SERVER(dir)))
		goto out;

	/*
	 * Check whether to close the file ...
	 */
	if (inode && NCP_FINFO(inode)->opened) {
#ifdef NCPFS_PARANOIA
printk(KERN_DEBUG "ncp_unlink: closing file\n");
#endif
		ncp_make_closed(inode);
	}

	error = ncp_del_file_or_subdir2(NCP_SERVER(dir), dentry);
#ifdef CONFIG_NCPFS_STRONG
	if (error == 0x9C && NCP_SERVER(dir)->m.flags & NCP_MOUNT_STRONG) { /* R/O */
		error = ncp_force_unlink(dir, dentry);
	}
#endif
	if (!error) {
		DPRINTK(KERN_DEBUG "ncp: removed %s/%s\n",
			dentry->d_parent->d_name.name, dentry->d_name.name);
		ncp_invalid_dir_cache(dir);
		d_delete(dentry);
	} else if (error == 0xFF) {
		error = -ENOENT;
	} else {
		error = -EACCES;
	}
		
out:
	return error;
}

static int ncp_rename(struct inode *old_dir, struct dentry *old_dentry,
		      struct inode *new_dir, struct dentry *new_dentry)
{
	int old_len = old_dentry->d_name.len;
	int new_len = new_dentry->d_name.len;
	int error;
	char _old_name[old_dentry->d_name.len + 1];
	char _new_name[new_dentry->d_name.len + 1];

	DPRINTK(KERN_DEBUG "ncp_rename: %s/%s to %s/%s\n",
		old_dentry->d_parent->d_name.name, old_dentry->d_name.name,
		new_dentry->d_parent->d_name.name, new_dentry->d_name.name);

	error = -ENOTDIR;
	if (!old_dir || !S_ISDIR(old_dir->i_mode)) {
		printk(KERN_WARNING "ncp_rename: old inode is NULL or not a directory\n");
		goto out;
	}
	if (!new_dir || !S_ISDIR(new_dir->i_mode)) {
		printk(KERN_WARNING "ncp_rename: new inode is NULL or not a directory\n");
		goto out;
	}
	error = -EIO;
	if (!ncp_conn_valid(NCP_SERVER(old_dir)))
		goto out;

	strncpy(_old_name, old_dentry->d_name.name, old_len);
	_old_name[old_len] = '\0';
	if (!ncp_preserve_case(old_dir)) {
		str_upper(_old_name);
	}

	strncpy(_new_name, new_dentry->d_name.name, new_len);
	_new_name[new_len] = '\0';
	if (!ncp_preserve_case(new_dir)) {
		str_upper(_new_name);
	}

	error = ncp_ren_or_mov_file_or_subdir(NCP_SERVER(old_dir),
					    old_dir, _old_name,
					    new_dir, _new_name);
#ifdef CONFIG_NCPFS_STRONG
	if (error == 0x90 && NCP_SERVER(old_dir)->m.flags & NCP_MOUNT_STRONG) {	/* RO */
		error = ncp_force_rename(old_dir, old_dentry, _old_name, new_dir, new_dentry, _new_name);
	}
#endif
	if (error == 0)
	{
		DPRINTK(KERN_DEBUG "ncp renamed %s -> %s.\n",
			old_dentry->d_name.name,new_dentry->d_name.name);
		ncp_invalid_dir_cache(old_dir);
		ncp_invalid_dir_cache(new_dir);
		d_move(old_dentry,new_dentry);
	} else {
		if (error == 0x9E)
			error = -ENAMETOOLONG;
		else if (error == 0xFF)
			error = -ENOENT;
		else
			error = -EACCES;
	}
out:
	return error;
}

/* The following routines 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};
/* Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec */


extern struct timezone sys_tz;

static int utc2local(int time)
{
	return time - sys_tz.tz_minuteswest * 60 +
	    (sys_tz.tz_dsttime ? 3600 : 0);
}

static int local2utc(int time)
{
	return time + sys_tz.tz_minuteswest * 60 -
	    (sys_tz.tz_dsttime ? 3600 : 0);
}

/* Convert a MS-DOS time/date pair to a UNIX date (seconds since 1 1 70). */
int
ncp_date_dos2unix(unsigned short time, unsigned short date)
{
	int month, year, secs;

	month = ((date >> 5) & 15) - 1;
	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(secs);
}


/* Convert linear UNIX date to a MS-DOS time/date pair. */
void
ncp_date_unix2dos(int unix_date, unsigned short *time, unsigned short *date)
{
	int day, year, nl_day, month;

	unix_date = utc2local(unix_date);
	*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);
}