patch-2.3.24 linux/fs/nfsd/nfsfh.c

• Lines: 1600
• Date: Mon Oct 25 10:43:43 1999
• Orig file: v2.3.23/linux/fs/nfsd/nfsfh.c
• Orig date: Sat Oct 9 11:47:50 1999

diff -u --recursive --new-file v2.3.23/linux/fs/nfsd/nfsfh.c linux/fs/nfsd/nfsfh.c
@@ -4,6 +4,8 @@
  * NFS server file handle treatment.
  *
  * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
+ * Portions Copyright (C) 1999 G. Allen Morris III <gam3@acm.org>
+ * Extensive cleanup by Neil Brown <neilb@cse.unsw.edu.au> Southern-Spring 1999
  */
 
 #include <linux/sched.h>
@@ -22,308 +24,48 @@
 #define NFSD_PARANOIA 1
 /* #define NFSD_DEBUG_VERBOSE 1 */
 
-extern unsigned long max_mapnr;
-
-#define NFSD_FILE_CACHE 0
-#define NFSD_DIR_CACHE  1
-struct fh_entry {
-	struct dentry * dentry;
-	unsigned long reftime;
-	ino_t	ino;
-	kdev_t	dev;
-};
-
-#define NFSD_MAXFH PAGE_SIZE/sizeof(struct fh_entry)
-static struct fh_entry filetable[NFSD_MAXFH];
-static struct fh_entry dirstable[NFSD_MAXFH];
 
 static int nfsd_nr_verified = 0;
 static int nfsd_nr_put = 0;
-static unsigned long nfsd_next_expire = 0;
-
-static int add_to_fhcache(struct dentry *, int);
-static int nfsd_d_validate(struct dentry *);
-struct dentry * lookup_inode(kdev_t, ino_t, ino_t);
-
-static LIST_HEAD(fixup_head);
-static LIST_HEAD(path_inuse);
-static int nfsd_nr_fixups = 0;
-static int nfsd_nr_paths = 0;
-#define NFSD_MAX_PATHS 500
-#define NFSD_MAX_FIXUPAGE 60*HZ
-
-struct nfsd_fixup {
-	struct list_head lru;
-	ino_t	dir;
-	ino_t	ino;
-	kdev_t	dev;
-	struct dentry *dentry;
-	unsigned long reftime;
-};
-
-struct nfsd_path {
-	struct list_head lru;
-	unsigned long reftime;
-	int	users;
-	ino_t	ino;
-	kdev_t	dev;
-	char	name[1];
-};
-
-static struct nfsd_fixup * find_cached_lookup(kdev_t dev, ino_t dir, ino_t ino)
-{
-	struct list_head *tmp = fixup_head.next;
-
-	for (; tmp != &fixup_head; tmp = tmp->next) {
-		struct nfsd_fixup *fp;
-
-		fp = list_entry(tmp, struct nfsd_fixup, lru);
-		if (fp->ino != ino)
-			continue;
-		if (fp->dir != dir)
-			continue;
-		if (fp->dev != dev)
-			continue;
-		list_del(tmp);
-		list_add(tmp, &fixup_head);
-		fp->reftime = jiffies;
-		return fp;
-	}
-	return NULL;
-}
-
-/*
- * Save the dentry pointer from a successful lookup.
- */
-static void add_to_lookup_cache(struct dentry *dentry, struct knfs_fh *fh)
-{
-	struct nfsd_fixup *fp;
-
-	fp = find_cached_lookup(u32_to_kdev_t(fh->fh_dev), 
-				u32_to_ino_t(fh->fh_dirino),
-				u32_to_ino_t(fh->fh_ino));
-	if (fp) {
-		fp->dentry = dentry;
-		return;
-	}
-
-	/*
-	 * Add a new entry. The small race here is unimportant:
-	 * if another task adds the same lookup, both entries
-	 * will be consistent.
-	 */
-	fp = kmalloc(sizeof(struct nfsd_fixup), GFP_KERNEL);
-	if (fp) {
-		fp->dir = u32_to_kdev_t(fh->fh_dirino);
-		fp->ino = u32_to_ino_t(fh->fh_ino);
-		fp->dev = u32_to_ino_t(fh->fh_dev);
-		fp->dentry = dentry;
-		fp->reftime = jiffies;
-		list_add(&fp->lru, &fixup_head);
-		nfsd_nr_fixups++;
-	}
-}
-
-static void free_fixup_entry(struct nfsd_fixup *fp)
-{
-	list_del(&fp->lru);
-	kfree(fp);
-	nfsd_nr_fixups--;
-}
-
-/*
- * Copy a dentry's path into the specified buffer.
- */
-static int copy_path(char *buffer, struct dentry *dentry, int namelen)
-{
-	char *p, *b = buffer;
-	int result = 0, totlen = 0, len; 
-
-	while (1) {
-		struct dentry *parent;
-		dentry = dentry->d_covers;
-		parent = dentry->d_parent;
-		len = dentry->d_name.len;
-		p = (char *) dentry->d_name.name + len;
-		totlen += len;
-		if (totlen > namelen)
-			goto out;
-		while (len--)
-			*b++ = *(--p);
-		if (dentry == parent)
-			break;
-		dentry = parent;
-		totlen++;
-		if (totlen > namelen)
-			goto out;
-		*b++ = '/';
-	}
-	*b = 0;
-
-	/*
-	 * Now reverse in place ...
-	 */
-	p = buffer;
-	while (p < b) {
-		char c = *(--b);
-		*b = *p;
-		*p++ = c;
-	} 
-	result = 1;
-out:
-	return result;
-}
-
-/*
- * Add a dentry's path to the path cache.
- */
-static int add_to_path_cache(struct dentry *dentry)
-{
-	struct inode *inode = dentry->d_inode;
-	struct dentry *this;
-	struct nfsd_path *new;
-	int len, result = 0;
-
-#ifdef NFSD_DEBUG_VERBOSE
-printk("add_to_path_cache: caching %s/%s\n",
-dentry->d_parent->d_name.name, dentry->d_name.name);
-#endif
-	/*
-	 * Get the length of the full pathname.
-	 */
-restart:
-	len = 0;
-	this = dentry;
-	while (1) {
-		struct dentry *parent;
-		this = this->d_covers;
-		parent = this->d_parent;
-		len += this->d_name.len;
-		if (this == parent)
-			break;
-		this = parent;
-		len++;
-	}
-	/*
-	 * Allocate a structure to hold the path.
-	 */
-	new = kmalloc(sizeof(struct nfsd_path) + len, GFP_KERNEL);
-	if (new) {
-		new->users = 0;	
-		new->reftime = jiffies;	
-		new->ino = inode->i_ino;	
-		new->dev = inode->i_dev;	
-		result = copy_path(new->name, dentry, len);	
-		if (!result)
-			goto retry;
-		list_add(&new->lru, &path_inuse);
-		nfsd_nr_paths++;
-#ifdef NFSD_DEBUG_VERBOSE
-printk("add_to_path_cache: added %s, paths=%d\n", new->name, nfsd_nr_paths);
-#endif
-	}
-	return result;
 
-	/*
-	 * If the dentry's path length changed, just try again.
-	 */
-retry:
-	kfree(new);
-	printk(KERN_DEBUG "add_to_path_cache: path length changed, retrying\n");
-	goto restart;
-}
-
-/*
- * Search for a path entry for the specified (dev, inode).
- */
-static struct nfsd_path *get_path_entry(kdev_t dev, ino_t ino)
-{
-	struct nfsd_path *pe;
-	struct list_head *tmp;
-
-	for (tmp = path_inuse.next; tmp != &path_inuse; tmp = tmp->next) {
-		pe = list_entry(tmp, struct nfsd_path, lru);
-		if (pe->ino != ino)
-			continue;
-		if (pe->dev != dev)
-			continue;
-		list_del(tmp);
-		list_add(tmp, &path_inuse);
-		pe->users++;
-		pe->reftime = jiffies;
-#ifdef NFSD_PARANOIA
-printk("get_path_entry: found %s for %s/%ld\n", pe->name, kdevname(dev), ino);
-#endif
-		return pe;
-	}
-	return NULL;
-}
-
-static void put_path(struct nfsd_path *pe)
-{
-	pe->users--;
-}
-
-static void free_path_entry(struct nfsd_path *pe)
-{
-	if (pe->users)
-		printk(KERN_DEBUG "free_path_entry: %s in use, users=%d\n",
-			pe->name, pe->users);
-	list_del(&pe->lru);
-	kfree(pe);
-	nfsd_nr_paths--;
-}
 
 struct nfsd_getdents_callback {
-	struct nfsd_dirent *dirent;
-	ino_t dirino;		/* parent inode number */
-	int found;		/* dirent inode matched? */
+	struct qstr *name;	/* name that was found. name->name already points to a buffer */
+	unsigned long ino;	/* the inum we are looking for */
+	int found;		/* inode matched? */
 	int sequence;		/* sequence counter */
 };
 
-struct nfsd_dirent {
-	ino_t ino;		/* preset to desired entry */
-	int len;
-	char name[256];
-};
-
 /*
- * A rather strange filldir function to capture the inode number
- * for the second entry (the parent inode) and the name matching
- * the specified inode number.
+ * A rather strange filldir function to capture
+ * the name matching the specified inode number.
  */
-static int filldir_one(void * __buf, const char * name, int len, 
+static int filldir_one(void * __buf, const char * name, int len,
 			off_t pos, ino_t ino)
 {
 	struct nfsd_getdents_callback *buf = __buf;
-	struct nfsd_dirent *dirent = buf->dirent;
+	struct qstr *qs = buf->name;
+	char *nbuf = (char*)qs->name; /* cast is to get rid of "const" */
 	int result = 0;
 
 	buf->sequence++;
 #ifdef NFSD_DEBUG_VERBOSE
-printk("filldir_one: seq=%d, ino=%ld, name=%s\n", buf->sequence, ino, name);
+dprintk("filldir_one: seq=%d, ino=%ld, name=%s\n", buf->sequence, ino, name);
 #endif
-	if (buf->sequence == 2) {
-		buf->dirino = ino;
-		goto out;
-	}
-	if (dirent->ino == ino) {
-		dirent->len = len;
-		memcpy(dirent->name, name, len);
-		dirent->name[len] = 0;
+	if (buf->ino == ino) {
+		qs->len = len;
+		memcpy(nbuf, name, len);
+		nbuf[len] = '\0';
 		buf->found = 1;
 		result = -1;
 	}
-out:
 	return result;
 }
 
 /*
- * Read a directory and return the parent inode number and the name
- * of the specified entry. The dirent must be initialized with the
- * inode number of the desired entry.
+ * Read a directory and return the name of the specified entry.
  */
-static int get_parent_ino(struct dentry *dentry, struct nfsd_dirent *dirent)
+static int get_ino_name(struct dentry *dentry, struct qstr *name, unsigned long ino)
 {
 	struct inode *dir = dentry->d_inode;
 	int error;
@@ -346,8 +88,8 @@
 	if (!file.f_op->readdir)
 		goto out_close;
 
-	buffer.dirent = dirent;
-	buffer.dirino = 0;
+	buffer.name = name;
+	buffer.ino = ino;
 	buffer.found = 0;
 	buffer.sequence = 0;
 	while (1) {
@@ -365,7 +107,6 @@
 		if (old_seq == buffer.sequence)
 			break;
 	}
-	dirent->ino = buffer.dirino;
 
 out_close:
 	if (file.f_op->release)
@@ -374,663 +115,245 @@
 	return error;
 }
 
-/*
- * Look up a dentry given inode and parent inode numbers.
- *
- * This relies on the ability of a Unix-like filesystem to return
- * the parent inode of a directory as the ".." (second) entry.
- *
- * This could be further optimized if we had an efficient way of
- * searching for a dentry given the inode: as we walk up the tree,
- * it's likely that a dentry exists before we reach the root.
+/* this should be provided by each filesystem in an nfsd_operations interface as
+ * iget isn't really the right interface
  */
-struct dentry * lookup_inode(kdev_t dev, ino_t dirino, ino_t ino)
+static inline struct dentry *nfsd_iget(struct super_block *sb, unsigned long ino, __u32 generation)
 {
-	struct super_block *sb;
-	struct dentry *root, *dentry, *result;
-	struct inode *dir;
-	char *name;
-	unsigned long page;
-	ino_t root_ino;
-	int error;
-	struct nfsd_dirent dirent;
-
-	result = ERR_PTR(-ENOMEM);
-	page = __get_free_page(GFP_KERNEL);
-	if (!page)
-		goto out;
-
-	/*
-	 * Get the root dentry for the device.
-	 */
-	result = ERR_PTR(-ENOENT);
-	sb = get_super(dev);
-	if (!sb)
-		goto out_page;
-	result = ERR_PTR(-ENOSYS);
-	if (!sb->s_op->read_inode)	/* No working iget(), e.g. FAT */
-		goto out_page;
-	root = dget(sb->s_root);
-	root_ino = root->d_inode->i_ino; /* usually 2 */
 
-	name = (char *) page + PAGE_SIZE;
-	*(--name) = 0;
-
-	/*
-	 * Walk up the tree to construct the name string.
-	 * When we reach the root inode, look up the name
-	 * relative to the root dentry.
+	/* iget isn't really right if the inode is currently unallocated!!
+	 * This should really all be done inside each filesystem
+	 *
+	 * ext2fs' read_inode has been strengthed to return a bad_inode if the inode
+	 *   had been deleted.
+	 *
+	 * Currently we don't know the generation for parent directory, so a generation
+	 * of 0 means "accept any"
 	 */
-	while (1) {
-		if (ino == root_ino) {
-			if (*name == '/')
-				name++;
-			/*
-			 * Note: this dput()s the root dentry.
-			 */
-			result = lookup_dentry(name, root, 0);
-			break;
-		}
-
-		result = ERR_PTR(-ENOENT);
-		dir = iget(sb, dirino);
-		if (!dir)
-			goto out_root;
-		dentry = d_alloc_root(dir);
-		if (!dentry)
-			goto out_iput;
-
-		/*
-		 * Get the name for this inode and the next parent inode.
-		 */
-		dirent.ino = ino;
-		error = get_parent_ino(dentry, &dirent);
-		result = ERR_PTR(error);
-		dput(dentry);
-		if (error)
-			goto out_root;
-		/*
-		 * Prepend the name to the buffer.
-		 */
-		result = ERR_PTR(-ENAMETOOLONG);
-		name -= (dirent.len + 1);
-		if ((unsigned long) name <= page)
-			goto out_root;
-		memcpy(name + 1, dirent.name, dirent.len);
-		*name = '/';
-
-		/*
-		 * Make sure we can't get caught in a loop ...
-		 */
-		if (dirino == dirent.ino && dirino != root_ino) {
-			printk(KERN_DEBUG 
-			       "lookup_inode: looping?? (ino=%ld, path=%s)\n",
-				dirino, name);	
-			goto out_root;
-		}
-		ino = dirino;
-		dirino = dirent.ino;
+	struct inode *inode;
+	struct list_head *lp;
+	struct dentry *result;
+	inode = iget(sb, ino);
+	if (is_bad_inode(inode)
+	    || (generation && inode->i_generation != generation)
+		) {
+		/* we didn't find the right inode.. */
+		dprintk("fh_verify: Inode %lu, Bad count: %d %d or version  %u %u\n",
+			inode->i_ino,
+			inode->i_nlink, inode->i_count,
+			inode->i_generation,
+			generation);
+
+		iput(inode);
+		return NULL;
+	}
+	/* now to find a dentry.
+	 * If possible, get a well-connected one
+	 */
+	for (lp = inode->i_dentry.next; lp != &inode->i_dentry ; lp=lp->next) {
+		result = list_entry(lp,struct dentry, d_alias);
+		if (! IS_ROOT(result) || inode->i_sb->s_root == result) {
+			dget(result);
+			iput(inode);
+			return result;
+		}
+	}
+	result = d_alloc_root(inode);
+	if (result == NULL) {
+		iput(inode);
+		return ERR_PTR(-ENOMEM);
 	}
-
-out_page:
-	free_page(page);
-out:
+	d_rehash(result); /* so a dput won't loose it */
 	return result;
-
-	/*
-	 * Error exits ...
-	 */
-out_iput:
-	result = ERR_PTR(-ENOMEM);
-	iput(dir);
-out_root:
-	dput(root);
-	goto out;
-}
-
-/*
- * Find an entry in the cache matching the given dentry pointer.
- */
-static struct fh_entry *find_fhe(struct dentry *dentry, int cache,
-				struct fh_entry **empty)
-{
-	struct fh_entry *fhe;
-	int i, found = (empty == NULL) ? 1 : 0;
-
-	if (!dentry)
-		goto out;
-
-	fhe = (cache == NFSD_FILE_CACHE) ? &filetable[0] : &dirstable[0];
-	for (i = 0; i < NFSD_MAXFH; i++, fhe++) {
-		if (fhe->dentry == dentry) {
-			fhe->reftime = jiffies;
-			return fhe;
-		}
-		if (!found && !fhe->dentry) {
-			found = 1;
-			*empty = fhe;
-		}
-	}
-out:
-	return NULL;
-}
-
-/*
- * Expire a cache entry.
- */
-static void expire_fhe(struct fh_entry *empty, int cache)
-{
-	struct dentry *dentry = empty->dentry;
-
-#ifdef NFSD_DEBUG_VERBOSE
-printk("expire_fhe: expiring %s/%s, d_count=%d, ino=%ld\n",
-dentry->d_parent->d_name.name, dentry->d_name.name, dentry->d_count,empty->ino);
-#endif
-	empty->dentry = NULL;	/* no dentry */
-	/*
-	 * Add the parent to the dir cache before releasing the dentry,
-	 * and check whether to save a copy of the dentry's path.
-	 */
-	if (!IS_ROOT(dentry)) {
-		struct dentry *parent = dget(dentry->d_parent);
-		if (add_to_fhcache(parent, NFSD_DIR_CACHE))
-			nfsd_nr_verified++;
-		else
-			dput(parent);
-		/*
-		 * If we're expiring a directory, copy its path.
-		 */
-		if (cache == NFSD_DIR_CACHE) {
-			add_to_path_cache(dentry);
-		}
-	}
-	dput(dentry);
-	nfsd_nr_put++;
-}
-
-/*
- * Look for an empty slot, or select one to expire.
- */
-static void expire_slot(int cache)
-{
-	struct fh_entry *fhe, *empty = NULL;
-	unsigned long oldest = -1;
-	int i;
-
-	fhe = (cache == NFSD_FILE_CACHE) ? &filetable[0] : &dirstable[0];
-	for (i = 0; i < NFSD_MAXFH; i++, fhe++) {
-		if (!fhe->dentry)
-			goto out;
-		if (fhe->reftime < oldest) {
-			oldest = fhe->reftime;
-			empty = fhe;
-		}
-	}
-	if (empty)
-		expire_fhe(empty, cache);
-
-out:
-	return;
 }
 
-/*
- * Expire any cache entries older than a certain age.
+/* this routine links an IS_ROOT dentry into the dcache tree.  It gains "parent"
+ * as a parent and "name" as a name
+ * It should possibly go in dcache.c
  */
-static void expire_old(int cache, int age)
+int d_splice(struct dentry *target, struct dentry *parent, struct qstr *name)
 {
-	struct list_head *tmp;
-	struct fh_entry *fhe;
-	int i;
-
-#ifdef NFSD_DEBUG_VERBOSE
-printk("expire_old: expiring %s older than %d\n",
-(cache == NFSD_FILE_CACHE) ? "file" : "dir", age);
-#endif
-	fhe = (cache == NFSD_FILE_CACHE) ? &filetable[0] : &dirstable[0];
-	for (i = 0; i < NFSD_MAXFH; i++, fhe++) {
-		if (!fhe->dentry)
-			continue;
-		if ((jiffies - fhe->reftime) > age)
-			expire_fhe(fhe, cache);
-	}
-
-	/*
-	 * Remove old entries from the patch-up cache.
-	 */
-	while ((tmp = fixup_head.prev) != &fixup_head) {
-		struct nfsd_fixup *fp;
-		fp = list_entry(tmp, struct nfsd_fixup, lru);
-		if ((jiffies - fp->reftime) < NFSD_MAX_FIXUPAGE)
-			break;
-		free_fixup_entry(fp);
-	}
-
-	/*
-	 * Trim the path cache ...
-	 */
-	while (nfsd_nr_paths > NFSD_MAX_PATHS) {
-		struct nfsd_path *pe;
-		pe = list_entry(path_inuse.prev, struct nfsd_path, lru);
-		if (pe->users)
-			break;
-		free_path_entry(pe);
-	}
-}
-
-/*
- * Add a dentry to the file or dir cache.
- *
- * Note: As NFS file handles must have an inode, we don't accept
- * negative dentries.
- */
-static int add_to_fhcache(struct dentry *dentry, int cache)
-{
-	struct fh_entry *fhe, *empty = NULL;
-	struct inode *inode = dentry->d_inode;
-
-	if (!inode) {
+	struct dentry *tdentry;
 #ifdef NFSD_PARANOIA
-printk("add_to_fhcache: %s/%s rejected, no inode!\n",
-dentry->d_parent->d_name.name, dentry->d_name.name);
+	if (!IS_ROOT(target))
+		printk("nfsd: d_splice with no-root target: %s/%s\n", parent->d_name.name, name->name);
 #endif
-		return 0;
-	}
+	name->hash = full_name_hash(name->name, name->len);
+	tdentry = d_alloc(parent, name);
+	if (tdentry == NULL)
+		return -ENOMEM;
+	d_move(target, tdentry);
 
-repeat:
-	fhe = find_fhe(dentry, cache, &empty);
-	if (fhe) {
-		return 0;
-	}
-
-	/*
-	 * Not found ... make a new entry.
+	/* tdentry will have been made a "child" of target (the parent of target)
+	 * make it an IS_ROOT instead
 	 */
-	if (empty) {
-		empty->dentry = dentry;
-		empty->reftime = jiffies;
-		empty->ino = inode->i_ino;
-		empty->dev = inode->i_dev;
-		return 1;
-	}
-
-	expire_slot(cache);
-	goto repeat;
-}
-
-/*
- * Find an entry in the dir cache for the specified inode number.
- */
-static struct fh_entry *find_fhe_by_ino(kdev_t dev, ino_t ino)
-{
-	struct fh_entry * fhe = &dirstable[0];
-	int i;
-
-	for (i = 0; i < NFSD_MAXFH; i++, fhe++) {
-		if (fhe->ino == ino && fhe->dev == dev) {
-			fhe->reftime = jiffies;
-			return fhe;
-		}
-	}
-	return NULL;
+	list_del(&tdentry->d_child);
+	tdentry->d_parent = tdentry;
+	d_rehash(target);
+	dput(tdentry);
+	return 0;
 }
 
-/*
- * Find the (directory) dentry with the specified (dev, inode) number.
- * Note: this leaves the dentry in the cache.
+/* this routine finds the dentry of the parent of a given directory
+ * it should be in the filesystem accessed by nfsd_operations
+ * it assumes lookup("..") works.
  */
-static struct dentry *find_dentry_by_ino(kdev_t dev, ino_t ino)
+struct dentry *nfsd_findparent(struct dentry *child)
 {
-	struct fh_entry *fhe;
-	struct nfsd_path *pe;
-	struct dentry * dentry;
-
-#ifdef NFSD_DEBUG_VERBOSE
-printk("find_dentry_by_ino: looking for inode %ld\n", ino);
-#endif
-	/*
-	 * Special case: inode number 2 is the root inode,
-	 * so we can use the root dentry for the device.
-	 */
-	if (ino == 2) {
-		struct super_block *sb = get_super(dev);
-		if (sb) {
-#ifdef NFSD_PARANOIA
-printk("find_dentry_by_ino: getting root dentry for %s\n", kdevname(dev));
-#endif
-			if (sb->s_root) {
-				dentry = dget(sb->s_root);
-				goto out;
-			} else {
-#ifdef NFSD_PARANOIA
-				printk("find_dentry_by_ino: %s has no root??\n",
-					kdevname(dev));
-#endif
-			}
-		}
-	}
+	struct dentry *tdentry, *pdentry;
+	tdentry = d_alloc(child, &(const struct qstr) {"..", 2, 0});
+	if (!tdentry)
+		return ERR_PTR(-ENOMEM);
 
-	/*
-	 * Search the dentry cache ...
+	/* I'm going to assume that if the returned dentry is different, then
+	 * it is well connected.  But nobody returns different dentrys do they?
 	 */
-	fhe = find_fhe_by_ino(dev, ino);
-	if (fhe) {
-		dentry = dget(fhe->dentry);
-		goto out;
-	}
-	/*
-	 * Search the path cache ...
-	 */
-	dentry = NULL;
-	pe = get_path_entry(dev, ino);
-	if (pe) {
-		struct dentry *res;
-		res = lookup_dentry(pe->name, NULL, 0);
-		if (!IS_ERR(res)) {
-			struct inode *inode = res->d_inode;
-			if (inode && inode->i_ino == ino &&
-				     inode->i_dev == dev) {
-				dentry = res;
-#ifdef NFSD_PARANOIA
-printk("find_dentry_by_ino: found %s/%s, ino=%ld\n",
-dentry->d_parent->d_name.name, dentry->d_name.name, ino);
-#endif
-				if (add_to_fhcache(dentry, NFSD_DIR_CACHE)) {
-					dget(dentry);
-					nfsd_nr_verified++;
-				}
-			} else {
-				dput(res);
-			}
-		} else {
-#ifdef NFSD_PARANOIA
-printk("find_dentry_by_ino: %s lookup failed\n", pe->name);
-#endif
-		}
-		put_path(pe);
-	}
-out:
-	return dentry;
-}
-
-/*
- * Look for an entry in the file cache matching the dentry pointer,
- * and verify that the (dev, inode) numbers are correct. If found,
- * the entry is removed from the cache.
- */
-static struct dentry *find_dentry_in_fhcache(struct knfs_fh *fh)
-{
-	struct fh_entry * fhe;
-
-	fhe = find_fhe(fh->fh_dcookie, NFSD_FILE_CACHE, NULL);
-	if (fhe) {
-		struct dentry *parent, *dentry;
-		struct inode *inode;
-
-		dentry = fhe->dentry;
-		inode = dentry->d_inode;
-
-		if (!inode) {
-#ifdef NFSD_PARANOIA
-printk("find_dentry_in_fhcache: %s/%s has no inode!\n",
-dentry->d_parent->d_name.name, dentry->d_name.name);
-#endif
-			goto out;
-		}
-		if (inode->i_ino != u32_to_ino_t(fh->fh_ino))
-			goto out;
- 		if (inode->i_dev != u32_to_kdev_t(fh->fh_dev))
-			goto out;
-
-		fhe->dentry = NULL;
-		fhe->ino = 0;
-		fhe->dev = 0;
-		nfsd_nr_put++;
-		/*
-		 * Make sure the parent is in the dir cache ...
+	pdentry = child->d_inode->i_op->lookup(child->d_inode, tdentry);
+	if (!pdentry) {
+		/* I don't want to return a ".." dentry.
+		 * I would prefer to return an unconnected "IS_ROOT" dentry,
+		 * though a properly connected dentry is even better
 		 */
-		parent = dget(dentry->d_parent);
-		if (add_to_fhcache(parent, NFSD_DIR_CACHE))
-			nfsd_nr_verified++;
-		else
-			dput(parent);
-		return dentry;
-	}
-out:
-	return NULL;
-}
-
-/*
- * Look for an entry in the parent directory with the specified
- * inode number.
- */
-static struct dentry *lookup_by_inode(struct dentry *parent, ino_t ino)
-{
-	struct dentry *dentry;
-	int error;
-	struct nfsd_dirent dirent;
-
-	/*
-	 * Search the directory for the inode number.
-	 */
-	dirent.ino = ino;
-	error = get_parent_ino(parent, &dirent);
-	if (error) {
-#ifdef NFSD_PARANOIA
-printk("lookup_by_inode: ino %ld not found in %s\n", ino, parent->d_name.name);
-#endif
-		goto no_entry;
-	}
-#ifdef NFSD_PARANOIA
-printk("lookup_by_inode: found %s\n", dirent.name);
-#endif
-
-	dentry = lookup_dentry(dirent.name, parent, 0);
-	if (!IS_ERR(dentry)) {
-		if (dentry->d_inode && dentry->d_inode->i_ino == ino)
-			goto out;
-#ifdef NFSD_PARANOIA
-printk("lookup_by_inode: %s/%s inode mismatch??\n",
-parent->d_name.name, dentry->d_name.name);
-#endif
-		dput(dentry);
-	} else {
-#ifdef NFSD_PARANOIA
-printk("lookup_by_inode: %s lookup failed, error=%ld\n",
-dirent.name, PTR_ERR(dentry));
-#endif
-	}
-
-no_entry:
-	dentry = NULL;
-out:
-	return dentry;
-
-}
-
-/*
- * Search the fix-up list for a dentry from a prior lookup.
- */
-static struct dentry *nfsd_cached_lookup(struct knfs_fh *fh)
-{
-	struct nfsd_fixup *fp;
-
-	fp = find_cached_lookup(u32_to_kdev_t(fh->fh_dev),
-				u32_to_ino_t(fh->fh_dirino),
-				u32_to_ino_t(fh->fh_ino));
-	if (fp)
-		return fp->dentry;
-	return NULL;
-}
-
-void
-expire_all(void)
-{
- 	if (time_after_eq(jiffies, nfsd_next_expire)) {
- 		expire_old(NFSD_FILE_CACHE,  5*HZ);
- 		expire_old(NFSD_DIR_CACHE , 60*HZ);
- 		nfsd_next_expire = jiffies + 5*HZ;
- 	}
-}
-
-/* 
- * Free cache after unlink/rmdir.
- */
-void
-expire_by_dentry(struct dentry *dentry)
-{
-	struct fh_entry *fhe;
-
-	fhe = find_fhe(dentry, NFSD_FILE_CACHE, NULL);
-	if (fhe) {
-		expire_fhe(fhe, NFSD_FILE_CACHE);
-	}
-	fhe = find_fhe(dentry, NFSD_DIR_CACHE, NULL);
-	if (fhe) {
-		expire_fhe(fhe, NFSD_DIR_CACHE);
-	}
+		/* if first or last of alias list is not tdentry, use that
+		 * else make a root dentry
+		 */
+		struct list_head *aliases = &tdentry->d_inode->i_dentry;
+		if (aliases->next != aliases) {
+			pdentry = list_entry(aliases->next, struct dentry, d_alias);
+			if (pdentry == tdentry)
+				pdentry = list_entry(aliases->prev, struct dentry, d_alias);
+			if (pdentry == tdentry)
+				pdentry = NULL;
+			if (pdentry) dget(pdentry);
+		}
+		if (pdentry == NULL) {
+			pdentry = d_alloc_root(igrab(tdentry->d_inode));
+			if (pdentry) d_rehash(pdentry);
+		}
+		if (pdentry == NULL)
+			pdentry = ERR_PTR(-ENOMEM);
+	}
+	dput(tdentry); /* it was never rehashed, it will be discarded */
+	return pdentry;
 }
 
 /*
- * The is the basic lookup mechanism for turning an NFS file handle 
- * into a dentry. There are several levels to the search:
- * (1) Look for the dentry pointer the short-term fhcache,
- *     and verify that it has the correct inode number.
- *
- * (2) Try to validate the dentry pointer in the file handle,
- *     and verify that it has the correct inode number. If this
- *     fails, check for a cached lookup in the fix-up list and
- *     repeat step (2) using the new dentry pointer.
- *
- * (3) Look up the dentry by using the inode and parent inode numbers
- *     to build the name string. This should succeed for any Unix-like
- *     filesystem.
- *
- * (4) Search for the parent dentry in the dir cache, and then
- *     look for the name matching the inode number.
- *
- * (5) The most general case ... search the whole volume for the inode.
- *
- * If successful, we return a dentry with the use count incremented.
- *
- * Note: steps (4) and (5) above are probably unnecessary now that (3)
- * is working. Remove the code once this is verified ...
+ * This is the basic lookup mechanism for turning an NFS file handle
+ * into a dentry.
+ * We use nfsd_iget and if that doesn't return a suitably connected dentry,
+ * we try to find the parent, and the parent of that and so-on until a
+ * connection if made.
  */
 static struct dentry *
-find_fh_dentry(struct knfs_fh *fh)
+find_fh_dentry(struct super_block *sb, struct knfs_fh *fh, int needpath)
 {
-	struct dentry *dentry, *parent;
-	int looked_up = 0, retry = 0;
-
-	/*
-	 * Stage 1: Look for the dentry in the short-term fhcache.
-	 */
-	dentry = find_dentry_in_fhcache(fh);
-	if (dentry) {
-		nfsdstats.fh_cached++;
-		goto out;
-	}
-
-	/*
-	 * Stage 2: Attempt to validate the dentry in the file handle.
-	 */
-	dentry = fh->fh_dcookie;
-recheck:
-	if (nfsd_d_validate(dentry)) {
-		struct inode * dir = dentry->d_parent->d_inode;
-
-		if (dir->i_ino == u32_to_ino_t(fh->fh_dirino) && 
-		    dir->i_dev == u32_to_kdev_t(fh->fh_dev)) {
-			struct inode * inode = dentry->d_inode;
-			/*
-			 * NFS file handles must always have an inode,
-			 * so we won't accept a negative dentry.
-			 */
-			if (inode && inode->i_ino == u32_to_ino_t(fh->fh_ino)) {
-				dget(dentry);
-#ifdef NFSD_DEBUG_VERBOSE
-printk("find_fh_dentry: validated %s/%s, ino=%ld\n",
-dentry->d_parent->d_name.name, dentry->d_name.name, inode->i_ino);
-#endif
-				if (!retry)
-					nfsdstats.fh_valid++;
-				else {
-					nfsdstats.fh_fixup++;
-#ifdef NFSD_DEBUG_VERBOSE
-printk("find_fh_dentry: retried validation successful\n");
-#endif
-				}
-				goto out;
+	struct dentry *dentry, *result = NULL;
+	struct qstr qs;
+	char namebuf[256];
+	int  found =0;
+	u32 err;
+
+	qs.name = namebuf;
+	/*
+	 * Attempt to find the inode.
+	 */
+	result = nfsd_iget(sb, fh->fh_ino, fh->fh_generation);
+	err = PTR_ERR(result);
+	if (IS_ERR(result))
+		goto err_out;
+	err = -ESTALE;
+	if (!result) {
+		dprintk("find_fh_dentry: No inode found.\n");
+		goto err_out;
+	}
+	if (!IS_ROOT(result) || result->d_inode->i_sb->s_root ==result)
+		return result;
+
+	/* result is now a "root" dentry, which may be adequate as it stands, or else
+	 * will get spliced into the dcache tree */
+
+	if (!S_ISDIR(result->d_inode->i_mode) && ! needpath) {
+		return result;
+	}
+
+	/* It's a directory, or we are required to confirm the file's
+	 * location in the tree.
+	 */
+	found = 0;
+	if (!S_ISDIR(result->d_inode->i_mode)) {
+		if (fh->fh_dirino == 0)
+			goto err_result; /* don't know how to find parent */
+		else {
+			/* need to iget fh->fh_dirino and make sure this inode is in that directory */
+			dentry = nfsd_iget(sb, fh->fh_dirino, 0);
+			err = PTR_ERR(dentry);
+			if (IS_ERR(dentry))
+				goto err_result;
+			err = -ESTALE;
+			if (!dentry->d_inode
+			    || !S_ISDIR(dentry->d_inode->i_mode)) {
+				goto err_dentry;
 			}
+			if (!IS_ROOT(dentry) || dentry->d_inode->i_sb->s_root ==dentry)
+				found = 1;
+			err = get_ino_name(dentry, &qs, result->d_inode->i_ino);
+			if (err)
+				goto err_dentry;
+
+			/* OK, we have the name in parent of inode,  lets fill in the dentry */
+			err = d_splice(result, dentry, &qs);
+			if (err)
+				goto err_dentry;
+		}
+	}
+	else
+		dentry = dget(result);
+
+	while(!found) {
+		/* LOOP INVARIANT */
+		/* haven't found a place in the tree yet, but we do have a path
+		 * from dentry down to result, and dentry is a directory.
+		 * Have a hold on dentry and result */
+		struct dentry *pdentry;
+		struct inode *parent;
+
+		pdentry = nfsd_findparent(dentry);
+		err = PTR_ERR(pdentry);
+		if (IS_ERR(pdentry))
+			goto err_dentry;
+		parent = pdentry->d_inode;
+		err = -EACCES;
+		if (!parent) {
+			dput(pdentry);
+			goto err_dentry;
 		}
-	}
-
-	/*
-	 * Before proceeding to a lookup, check whether we cached a
-	 * prior lookup. If so, try to validate that dentry ...
-	 */
-	if (!retry && (dentry = nfsd_cached_lookup(fh)) != NULL) {
-		retry = 1;
-		goto recheck;
-	}
+		/* I'm not sure that this is the best test for
+		 *  "is it not a floating dentry?"
+		 */
+		if (!IS_ROOT(pdentry) || parent->i_sb->s_root == pdentry)
+			found = 1;
 
-	/*
-	 * Stage 3: Look up the dentry based on the inode and parent inode
-	 * numbers. This should work for all Unix-like filesystems.
-	 */
-	looked_up = 1;
-	dentry = lookup_inode(u32_to_kdev_t(fh->fh_dev),
-			      u32_to_ino_t(fh->fh_dirino),
-			      u32_to_ino_t(fh->fh_ino));
-	if (!IS_ERR(dentry)) {
-		struct inode * inode = dentry->d_inode;
-#ifdef NFSD_DEBUG_VERBOSE
-printk("find_fh_dentry: looked up %s/%s\n",
-dentry->d_parent->d_name.name, dentry->d_name.name);
-#endif
-		if (inode && inode->i_ino == u32_to_ino_t(fh->fh_ino)) {
-			nfsdstats.fh_lookup++;
-			goto out;
+		err = get_ino_name(pdentry, &qs, dentry->d_inode->i_ino);
+		if (err) {
+			dput(pdentry);
+			goto err_dentry;
 		}
-#ifdef NFSD_PARANOIA
-printk("find_fh_dentry: %s/%s lookup mismatch!\n",
-dentry->d_parent->d_name.name, dentry->d_name.name);
-#endif
+		err = d_splice(dentry, pdentry, &qs);
+		dprintk("nfsd_fh: found name %s for ino %ld\n", dentry->d_name.name, dentry->d_inode->i_ino);
 		dput(dentry);
+		dentry = pdentry;
 	}
+	dput(dentry);
+	return result;
 
-	/*
-	 * Stage 4: Look for the parent dentry in the fhcache ...
-	 */
-	parent = find_dentry_by_ino(u32_to_kdev_t(fh->fh_dev),
-				    u32_to_ino_t(fh->fh_dirino));
-	if (parent) {
-		/*
-		 * ... then search for the inode in the parent directory.
-		 */
-		dentry = lookup_by_inode(dget(parent), u32_to_ino_t(fh->fh_ino));
-		dput(parent);
-		if (dentry)
-			goto out;
-	}
-
-	/*
-	 * Stage 5: Search the whole volume.
-	 */
-#ifdef NFSD_PARANOIA
-printk("find_fh_dentry: %s, %u/%u not found -- need full search!\n",
-kdevname(u32_to_kdev_t(fh->fh_dev)), fh->fh_dirino, fh->fh_ino);
-#endif
-	dentry = NULL;
-	nfsdstats.fh_stale++;
-	
-out:
-	if (looked_up && dentry) {
-		add_to_lookup_cache(dentry, fh);
-	}
-
-	expire_all();
-
-	return dentry;
+err_dentry:
+	dput(dentry);
+err_result:
+	dput(result);
+err_out:
+	if (err == -ESTALE)
+		nfsdstats.fh_stale++;
+	return ERR_PTR(err);
 }
 
 /*
@@ -1038,6 +361,9 @@
  *
  * Note that the file handle dentry may need to be freed even after
  * an error return.
+ *
+ * This is only called at the start of an nfsproc call, so fhp points to
+ * a svc_fh which is all 0 except for the over-the-wire file handle.
  */
 u32
 fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, int access)
@@ -1048,20 +374,36 @@
 	struct inode	*inode;
 	u32		error = 0;
 
-	dprintk("nfsd: fh_verify(exp %x/%u cookie %p)\n",
-		fh->fh_xdev, fh->fh_xino, fh->fh_dcookie);
+	dprintk("nfsd: fh_verify(exp %s/%u file (%s/%u dir %u)\n",
+		kdevname(fh->fh_xdev),
+		fh->fh_xino,
+		kdevname(fh->fh_dev),
+		fh->fh_ino,
+		fh->fh_dirino);
+
+	/*
+	 * Security: Check that the fh is internally consistant (from <gam3@acm.org>)
+	 */
+	if (fh->fh_dev != fh->fh_xdev) {
+		printk("fh_verify: Security: export on other device (%s, %s).\n",
+			kdevname(fh->fh_dev), kdevname(fh->fh_xdev));
+		error = nfserr_stale;
+		nfsdstats.fh_stale++;
+		goto out;
+	}
 
-	if (fhp->fh_dverified)
-		goto check_type;
 	/*
 	 * Look up the export entry.
 	 */
 	error = nfserr_stale;
 	exp = exp_get(rqstp->rq_client,
-			u32_to_kdev_t(fh->fh_xdev),
-			u32_to_ino_t(fh->fh_xino));
-	if (!exp) /* export entry revoked */
+		      u32_to_kdev_t(fh->fh_xdev),
+		      u32_to_ino_t(fh->fh_xino));
+	if (!exp) {
+		/* export entry revoked */
+		nfsdstats.fh_stale++;
 		goto out;
+	}
 
 	/* Check if the request originated from a secure port. */
 	error = nfserr_perm;
@@ -1079,32 +421,31 @@
 	/*
 	 * Look up the dentry using the NFS file handle.
 	 */
-	error = nfserr_noent;
-	dentry = find_fh_dentry(fh);
-	if (!dentry)
+
+	dentry = find_fh_dentry(exp->ex_dentry->d_inode->i_sb,
+				fh,
+				!(exp->ex_flags & NFSEXP_NOSUBTREECHECK));
+
+	if (IS_ERR(dentry)) {
+		error = nfserrno(-PTR_ERR(dentry));
 		goto out;
+	}
 
-	/*
-	 * Note:  it's possible the returned dentry won't be the one in the
-	 * file handle.  We can correct the file handle for our use, but
-	 * unfortunately the client will keep sending the broken one.  Let's
-	 * hope the lookup will keep patching things up.
-	 */
 	fhp->fh_dentry = dentry;
 	fhp->fh_export = exp;
 	fhp->fh_dverified = 1;
 	nfsd_nr_verified++;
 
+	inode = dentry->d_inode;
+
 	/* Type check. The correct error return for type mismatches
 	 * does not seem to be generally agreed upon. SunOS seems to
 	 * use EISDIR if file isn't S_IFREG; a comment in the NFSv3
 	 * spec says this is incorrect (implementation notes for the
 	 * write call).
 	 */
-check_type:
-	dentry = fhp->fh_dentry;
-	inode = dentry->d_inode;
-	exp = fhp->fh_export;
+
+	/* When is type ever negative? */
 	if (type > 0 && (inode->i_mode & S_IFMT) != type) {
 		error = (type == S_IFDIR)? nfserr_notdir : nfserr_isdir;
 		goto out;
@@ -1118,35 +459,37 @@
 	 * Security: Check that the export is valid for dentry <gam3@acm.org>
 	 */
 	error = 0;
-	if (fh->fh_dev != fh->fh_xdev) {
-		printk("fh_verify: Security: export on other device"
-		       " (%d, %d).\n", fh->fh_dev, fh->fh_xdev);
-		error = nfserr_stale;
-	} else if (exp->ex_dentry != dentry) {
-		struct dentry *tdentry = dentry;
 
-		do {
-			tdentry = tdentry->d_parent;
-			if (exp->ex_dentry == tdentry)
-				break;
-			/* executable only by root and we can't be root */
-			if (current->fsuid &&
-			    !(tdentry->d_inode->i_uid  &&
-			        (tdentry->d_inode->i_mode & S_IXUSR)) &&
-			    !(tdentry->d_inode->i_gid &&
-			        (tdentry->d_inode->i_mode & S_IXGRP)) &&
-			    !(tdentry->d_inode->i_mode & S_IXOTH) && 
-			    (exp->ex_flags & NFSEXP_ROOTSQUASH)) {
+	if (!(exp->ex_flags & NFSEXP_NOSUBTREECHECK)) {
+		if (exp->ex_dentry != dentry) {
+			struct dentry *tdentry = dentry;
+
+			do {
+				tdentry = tdentry->d_parent;
+				if (exp->ex_dentry == tdentry)
+					break;
+				/* executable only by root and we can't be root */
+				if (current->fsuid
+				    && (exp->ex_flags & NFSEXP_ROOTSQUASH)
+				    && !(tdentry->d_inode->i_uid
+					 && (tdentry->d_inode->i_mode & S_IXUSR))
+				    && !(tdentry->d_inode->i_gid
+					 && (tdentry->d_inode->i_mode & S_IXGRP))
+				    && !(tdentry->d_inode->i_mode & S_IXOTH)
+					) {
+					error = nfserr_stale;
+					nfsdstats.fh_stale++;
+					dprintk("fh_verify: no root_squashed access.\n");
+				}
+			} while ((tdentry != tdentry->d_parent));
+			if (exp->ex_dentry != tdentry) {
 				error = nfserr_stale;
-dprintk("fh_verify: no root_squashed access.\n");
+				nfsdstats.fh_stale++;
+				printk("nfsd Security: %s/%s bad export.\n",
+				       dentry->d_parent->d_name.name,
+				       dentry->d_name.name);
+				goto out;
 			}
-		} while (!IS_ROOT(tdentry));
-		if (exp->ex_dentry != tdentry) {
-			error = nfserr_stale;
-			printk("nfsd Security: %s/%s bad export.\n",
-			       dentry->d_parent->d_name.name,
-			       dentry->d_name.name);
-			goto out;
 		}
 	}
 
@@ -1155,9 +498,10 @@
 		error = nfsd_permission(exp, dentry, access);
 	}
 #ifdef NFSD_PARANOIA
-if (error)
-printk("fh_verify: %s/%s permission failure, acc=%x, error=%d\n",
-dentry->d_parent->d_name.name, dentry->d_name.name, access, (error >> 24));
+	if (error) {
+		printk("fh_verify: %s/%s permission failure, acc=%x, error=%d\n",
+		       dentry->d_parent->d_name.name, dentry->d_name.name, access, (error >> 24));
+	}
 #endif
 out:
 	return error;
@@ -1192,14 +536,17 @@
 	}
 	fh_init(fhp);
 
-	fhp->fh_handle.fh_dcookie = dentry;
+	fhp->fh_handle.fh_dirino = ino_t_to_u32(parent->d_inode->i_ino);
+	fhp->fh_handle.fh_dev    = kdev_t_to_u32(parent->d_inode->i_dev);
+	fhp->fh_handle.fh_xdev   = kdev_t_to_u32(exp->ex_dev);
+	fhp->fh_handle.fh_xino   = ino_t_to_u32(exp->ex_ino);
+	fhp->fh_handle.fh_dcookie = (struct dentry *)0xfeebbaca;
 	if (inode) {
 		fhp->fh_handle.fh_ino = ino_t_to_u32(inode->i_ino);
+		fhp->fh_handle.fh_generation = inode->i_generation;
+		if (S_ISDIR(inode->i_mode) || (exp->ex_flags & NFSEXP_NOSUBTREECHECK))
+			fhp->fh_handle.fh_dirino = 0;
 	}
-	fhp->fh_handle.fh_dirino = ino_t_to_u32(parent->d_inode->i_ino);
-	fhp->fh_handle.fh_dev	 = kdev_t_to_u32(parent->d_inode->i_dev);
-	fhp->fh_handle.fh_xdev	 = kdev_t_to_u32(exp->ex_dev);
-	fhp->fh_handle.fh_xino	 = ino_t_to_u32(exp->ex_ino);
 
 	fhp->fh_dentry = dentry; /* our internal copy */
 	fhp->fh_export = exp;
@@ -1211,6 +558,7 @@
 
 /*
  * Update file handle information after changing a dentry.
+ * This is only called by nfsd_create
  */
 void
 fh_update(struct svc_fh *fhp)
@@ -1226,6 +574,10 @@
 	if (!inode)
 		goto out_negative;
 	fhp->fh_handle.fh_ino = ino_t_to_u32(inode->i_ino);
+	fhp->fh_handle.fh_generation = inode->i_generation;
+	if (S_ISDIR(inode->i_mode) || (fhp->fh_export->ex_flags & NFSEXP_NOSUBTREECHECK))
+		fhp->fh_handle.fh_dirino = 0;
+
 out:
 	return;
 
@@ -1239,8 +591,7 @@
 }
 
 /*
- * Release a file handle.  If the file handle carries a dentry count,
- * we add the dentry to the short-term cache rather than release it.
+ * Release a file handle.
  */
 void
 fh_put(struct svc_fh *fhp)
@@ -1251,10 +602,8 @@
 		fhp->fh_dverified = 0;
 		if (!dentry->d_count)
 			goto out_bad;
-		if (!dentry->d_inode || !add_to_fhcache(dentry, 0)) {
-			dput(dentry);
-			nfsd_nr_put++;
-		}
+		dput(dentry);
+		nfsd_nr_put++;
 	}
 	return;
 
@@ -1262,136 +611,4 @@
 	printk(KERN_ERR "fh_put: %s/%s has d_count 0!\n",
 		dentry->d_parent->d_name.name, dentry->d_name.name);
 	return;
-}
-
-/*
- * Verify that the FH dentry is still a valid dentry pointer.
- * After making some preliminary checks, we ask VFS to verify
- * that it is indeed a dentry.
- */
-static int nfsd_d_validate(struct dentry *dentry)
-{
-	unsigned long dent_addr = (unsigned long) dentry;
-	unsigned long min_addr = PAGE_OFFSET;
-	unsigned long max_addr = min_addr + (max_mapnr << PAGE_SHIFT);
-	unsigned long align_mask = 0x0F;
-	unsigned int len;
-	int valid = 0;
-
-	if (dent_addr < min_addr)
-		goto bad_addr;
-	if (dent_addr > max_addr - sizeof(struct dentry))
-		goto bad_addr;
-	if ((dent_addr & ~align_mask) != dent_addr)
-		goto bad_align;
-	if (!kern_addr_valid(dent_addr))
-		goto bad_addr;
-	/*
-	 * Looks safe enough to dereference ...
-	 */
-	len = dentry->d_name.len;
-	if (len > NFS_MAXNAMLEN)
-		goto out;
-	/*
-	 * Note: d_validate doesn't dereference the parent pointer ...
-	 * just combines it with the name hash to find the hash chain.
-	 */
-	valid = d_validate(dentry, dentry->d_parent, dentry->d_name.hash, len);
-
-out:
-	return valid;
-
-bad_addr:
-	printk(KERN_DEBUG "nfsd_d_validate: invalid address %lx\n", dent_addr);
-	goto out;
-bad_align:
-	printk(KERN_DEBUG "nfsd_d_validate: unaligned address %lx\n", dent_addr);
-	goto out;
-}
-
-/*
- * Flush any cached dentries for the specified device
- * or for all devices.
- *
- * This is called when revoking the last export for a
- * device, so that it can be unmounted cleanly.
- */
-void nfsd_fh_flush(kdev_t dev)
-{
-	struct fh_entry *fhe;
-	int i, pass = 2;
-
-	fhe = &filetable[0];
-	while (pass--) {
-		for (i = 0; i < NFSD_MAXFH; i++, fhe++) {
-			struct dentry *dentry = fhe->dentry;
-			if (!dentry)
-				continue;
-			if (dev && dentry->d_inode->i_dev != dev)
-				continue;
-			fhe->dentry = NULL;
-			dput(dentry);
-			nfsd_nr_put++;
-		}
-		fhe = &dirstable[0];
-	}
-}
-
-/*
- * Free the dentry and path caches.
- */
-void nfsd_fh_free(void)
-{
-	struct list_head *tmp;
-	int i;
-
-	/* Flush dentries for all devices */
-	nfsd_fh_flush(0);
-
-	/*
-	 * N.B. write a destructor for these lists ...
-	 */
-	i = 0;
-	while ((tmp = fixup_head.next) != &fixup_head) {
-		struct nfsd_fixup *fp;
-		fp = list_entry(tmp, struct nfsd_fixup, lru);
-		free_fixup_entry(fp);
-		i++;
-	}
-	printk(KERN_DEBUG "nfsd_fh_free: %d fixups freed\n", i);
-
-	i = 0;
-	while ((tmp = path_inuse.next) != &path_inuse) {
-		struct nfsd_path *pe;
-		pe = list_entry(tmp, struct nfsd_path, lru);
-		free_path_entry(pe);
-		i++;
-	}
-	printk(KERN_DEBUG "nfsd_fh_free: %d paths freed\n", i);
-
-	printk(KERN_DEBUG "nfsd_fh_free: verified %d, put %d\n",
-		nfsd_nr_verified, nfsd_nr_put);
-}
-
-void nfsd_fh_init(void)
-{
-	/* Sanity check */ 
-	extern void __my_nfsfh_is_too_big(void); 
-	if (sizeof(struct nfs_fhbase) > 32) 
-		__my_nfsfh_is_too_big(); 
-
-	memset(filetable, 0, NFSD_MAXFH*sizeof(struct fh_entry));
-	memset(dirstable, 0, NFSD_MAXFH*sizeof(struct fh_entry));
-	INIT_LIST_HEAD(&path_inuse);
-	INIT_LIST_HEAD(&fixup_head);
-
-	printk(KERN_DEBUG 
-		"nfsd_init: initialized fhcache, entries=%lu\n", NFSD_MAXFH);
-	/*
-	 * Display a warning if the ino_t is larger than 32 bits.
-	 */
-	if (sizeof(ino_t) > sizeof(__u32))
-		printk(KERN_INFO 
-			"NFSD: ino_t is %d bytes, using lower 4 bytes\n",
-			sizeof(ino_t));
 }