path: root/fs/jffs/inode-v23.c

/*
 * JFFS -- Journalling Flash File System, Linux implementation.
 *
 * Copyright (C) 1999, 2000  Axis Communications AB.
 *
 * Created by Finn Hakansson <finn@axis.com>.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * $Id: inode-v23.c,v 1.33 2000/08/09 15:59:06 dwmw2 Exp $
 *
 *
 * Ported to Linux 2.3.x and MTD:
 * Copyright (C) 2000  Alexander Larsson (alex@cendio.se), Cendio Systems AB
 *
 */

/* inode.c -- Contains the code that is called from the VFS.  */

/* TODO-ALEX:
 * uid and gid are just 16 bit.
 * jffs_file_write reads from user-space pointers without xx_from_user
 * maybe other stuff do to.
 */

/* Argh. Some architectures have kernel_thread in asm/processor.h
   Some have it in unistd.h and you need to define __KERNEL_SYSCALLS__
   Pass me a baseball bat and the person responsible.
   dwmw2
*/
#define __KERNEL_SYSCALLS__
#include <linux/sched.h>
#include <linux/unistd.h>

#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/malloc.h>
#include <linux/jffs.h>
#include <linux/fs.h>
#include <linux/locks.h>
#include <linux/smp_lock.h>
#include <linux/sched.h>
#include <linux/ioctl.h>
#include <linux/stat.h>
#include <linux/blkdev.h>
#include <linux/quotaops.h>
#include <asm/semaphore.h>
#include <asm/byteorder.h>
#include <asm/uaccess.h>
#include "jffs_fm.h"
#include "intrep.h"

static int jffs_remove(struct inode *dir, struct dentry *dentry, int type);

static struct super_operations jffs_ops;
static struct file_operations jffs_file_operations;
static struct inode_operations jffs_file_inode_operations;
static struct file_operations jffs_dir_operations;
static struct inode_operations jffs_dir_inode_operations;
static struct address_space_operations jffs_address_operations;


/* Called by the VFS at mount time to initialize the whole file system.  */
static struct super_block *
jffs_read_super(struct super_block *sb, void *data, int silent)
{
	kdev_t dev = sb->s_dev;
	struct inode *root_inode;
	struct jffs_control *c;

	D1(printk(KERN_NOTICE "JFFS: Trying to mount device %s.\n",
		  kdevname(dev)));

	if (MAJOR(dev) != MTD_BLOCK_MAJOR) {
		printk(KERN_WARNING "JFFS: Trying to mount a "
		       "non-mtd device.\n");
		return 0;
	}

	sb->s_blocksize = PAGE_CACHE_SIZE;
	sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
	sb->u.generic_sbp = (void *) 0;

	/* Build the file system.  */
	if (jffs_build_fs(sb) < 0) {
		goto jffs_sb_err1;
	}

	/*
	 * set up enough so that we can read an inode
	 */
	sb->s_magic = JFFS_MAGIC_SB_BITMASK;
	sb->s_op = &jffs_ops;

	root_inode = iget(sb, JFFS_MIN_INO);
	if (!root_inode)
	        goto jffs_sb_err2;

	/* Get the root directory of this file system.  */
	if (!(sb->s_root = d_alloc_root(root_inode))) {
		goto jffs_sb_err3;
	}

	c = (struct jffs_control *) sb->u.generic_sbp;

	/* Set the Garbage Collection thresholds */

	/* GC if free space goes below 5% of the total size */
	c->gc_minfree_threshold = c->fmc->flash_size / 20;

	if (c->gc_minfree_threshold < c->fmc->sector_size)
		c->gc_minfree_threshold = c->fmc->sector_size;

	/* GC if dirty space exceeds 33% of the total size. */
	c->gc_maxdirty_threshold = c->fmc->flash_size / 3;

	if (c->gc_maxdirty_threshold < c->fmc->sector_size)
		c->gc_maxdirty_threshold = c->fmc->sector_size;


	c->thread_pid = kernel_thread (jffs_garbage_collect_thread, 
				        (void *) c, 
				        CLONE_FS | CLONE_FILES | CLONE_SIGHAND);
	D1(printk(KERN_NOTICE "JFFS: GC thread pid=%d.\n", (int) c->thread_pid));

	D1(printk(KERN_NOTICE "JFFS: Successfully mounted device %s.\n",
	       kdevname(dev)));
	return sb;

jffs_sb_err3:
	iput(root_inode);
jffs_sb_err2:
	jffs_cleanup_control((struct jffs_control *)sb->u.generic_sbp);
jffs_sb_err1:
	printk(KERN_WARNING "JFFS: Failed to mount device %s.\n",
	       kdevname(dev));
	return 0;
}


/* This function is called when the file system is umounted.  */
static void
jffs_put_super(struct super_block *sb)
{
	struct jffs_control *c = (struct jffs_control *) sb->u.generic_sbp;
	D1(kdev_t dev = sb->s_dev);

	D2(printk("jffs_put_super()\n"));

	D1(printk (KERN_NOTICE "jffs_put_super(): Telling gc thread to die.\n"));
	if (c->gc_task) {
		send_sig(SIGQUIT, c->gc_task, 1);
		send_sig(SIGCONT, c->gc_task, 1);
	}
	down (&c->gc_thread_sem);

	D1(printk (KERN_NOTICE "jffs_put_super(): Successfully waited on thread.\n"));

	sb->s_dev = 0;
	jffs_cleanup_control((struct jffs_control *)sb->u.generic_sbp);
	D1(printk(KERN_NOTICE "JFFS: Successfully unmounted device %s.\n",
	       kdevname(dev)));
}


/* This function is called when user commands like chmod, chgrp and
   chown are executed. System calls like trunc() results in a call
   to this function.  */
static int
jffs_setattr(struct dentry *dentry, struct iattr *iattr)
{
	struct inode *inode = dentry->d_inode;
	struct jffs_raw_inode raw_inode;
	struct jffs_control *c;
	struct jffs_fmcontrol *fmc;
	struct jffs_file *f;
	struct jffs_node *new_node;
	char *name = 0;
	int update_all;
	int res;

	f = (struct jffs_file *)inode->u.generic_ip;
	ASSERT(if (!f) {
		printk("jffs_setattr(): Invalid inode number: %lu\n",
		       inode->i_ino);
		return -1;
	});

	D1(printk("***jffs_setattr(): file: \"%s\", ino: %u\n",
		  f->name, f->ino));

	c = f->c;
	fmc = c->fmc;
	update_all = iattr->ia_valid & ATTR_FORCE;

	if (!JFFS_ENOUGH_SPACE(c)) {
		if ( (update_all || iattr->ia_valid & ATTR_SIZE)
		     && (iattr->ia_size < f->size) ) {
			/* See this case where someone is trying to
			   shrink the size of a file as an exception.
			   Accept it.  */
			/* TODO: Might just shrink it a bit?
			   check f->size - ia_size */
		} else {
			D1(printk("jffs_setattr(): Free size = %u\n",
				  jffs_free_size1(fmc)
				  + jffs_free_size2(fmc)));
			D(printk(KERN_NOTICE "JFFS: No space left on "
				 "device\n"));
			return -ENOSPC;
		}
	}

	if (!(new_node = (struct jffs_node *)
			 kmalloc(sizeof(struct jffs_node), GFP_KERNEL))) {
		D(printk("jffs_setattr(): Allocation failed!\n"));
		return -ENOMEM;
	}
	DJM(no_jffs_node++);
	new_node->data_offset = 0;
	new_node->removed_size = 0;
	raw_inode.magic = JFFS_MAGIC_BITMASK;
	raw_inode.ino = f->ino;
	raw_inode.pino = f->pino;
	raw_inode.version = f->highest_version + 1;
	raw_inode.mode = f->mode;
	raw_inode.uid = f->uid;
	raw_inode.gid = f->gid;
	raw_inode.atime = f->atime;
	raw_inode.mtime = f->mtime;
	raw_inode.ctime = f->ctime;
	raw_inode.dsize = 0;
	raw_inode.offset = 0;
	raw_inode.rsize = 0;
	raw_inode.dsize = 0;
	raw_inode.nsize = 0;
	raw_inode.nlink = f->nlink;
	raw_inode.spare = 0;
	raw_inode.rename = 0;
	raw_inode.deleted = 0;

	if (update_all || iattr->ia_valid & ATTR_MODE) {
		raw_inode.mode = iattr->ia_mode;
		inode->i_mode = iattr->ia_mode;
	}
	if (update_all || iattr->ia_valid & ATTR_UID) {
		raw_inode.uid = iattr->ia_uid;
		inode->i_uid = iattr->ia_uid;
	}
	if (update_all || iattr->ia_valid & ATTR_GID) {
		raw_inode.gid = iattr->ia_gid;
		inode->i_gid = iattr->ia_gid;
	}
	if (update_all || iattr->ia_valid & ATTR_SIZE) {
		int len;
		D1(printk("jffs_notify_change(): Changing size "
			  "to %lu bytes!\n", (long)iattr->ia_size));
		raw_inode.offset = iattr->ia_size;

		/* Calculate how many bytes need to be removed from
		   the end.  */
		if (f->size < iattr->ia_size) {
			len = 0;
		}
		else {
			len = f->size - iattr->ia_size;
		}

		raw_inode.rsize = len;

		/* The updated node will be a removal node, with
		   base at the new size and size of the nbr of bytes
		   to be removed.  */
		new_node->data_offset = iattr->ia_size;
		new_node->removed_size = len;
		inode->i_size = iattr->ia_size;

		/* If we truncate a file we want to add the name.  If we
		   always do that, we could perhaps free more space on
		   the flash (and besides it doesn't hurt).  */
		name = f->name;
		raw_inode.nsize = f->nsize;
		if (len) {
			invalidate_inode_pages(inode);
		}
		inode->i_ctime = CURRENT_TIME;
		inode->i_mtime = inode->i_ctime;
	}
	if (update_all || iattr->ia_valid & ATTR_ATIME) {
		raw_inode.atime = iattr->ia_atime;
		inode->i_atime = iattr->ia_atime;
	}
	if (update_all || iattr->ia_valid & ATTR_MTIME) {
		raw_inode.mtime = iattr->ia_mtime;
		inode->i_mtime = iattr->ia_mtime;
	}
	if (update_all || iattr->ia_valid & ATTR_CTIME) {
		raw_inode.ctime = iattr->ia_ctime;
		inode->i_ctime = iattr->ia_ctime;
	}

	/* Write this node to the flash.  */
	if ((res = jffs_write_node(c, new_node, &raw_inode, name, 0)) < 0) {
		D(printk("jffs_notify_change(): The write failed!\n"));
		kfree(new_node);
		DJM(no_jffs_node--);
		return res;
	}

	jffs_insert_node(c, f, &raw_inode, 0, new_node);

	mark_inode_dirty(inode);

	return 0;
} /* jffs_notify_change()  */


struct inode *
jffs_new_inode(const struct inode * dir, struct jffs_raw_inode *raw_inode,
	       int * err)
{
	struct super_block * sb;
	struct inode * inode;
	struct jffs_control *c;

	inode = get_empty_inode();
	if (!inode) {
		*err = -ENOMEM;
		return NULL;
	}

	sb = dir->i_sb;
	c = (struct jffs_control *)sb->u.generic_sbp;

	inode->i_sb = sb;
	inode->i_dev = sb->s_dev;
	inode->i_ino = raw_inode->ino;
	inode->i_mode = raw_inode->mode;
	inode->i_nlink = raw_inode->nlink;
	inode->i_uid = raw_inode->uid;
	inode->i_gid = raw_inode->gid;
	inode->i_rdev = 0;
	inode->i_size = raw_inode->dsize;
	inode->i_atime = raw_inode->atime;
	inode->i_mtime = raw_inode->mtime;
	inode->i_ctime = raw_inode->ctime;
	inode->i_blksize = PAGE_SIZE;
	inode->i_blocks = (raw_inode->dsize + PAGE_SIZE - 1) >> PAGE_SHIFT;
	inode->i_version = 0;
	inode->i_flags = sb->s_flags;
	inode->u.generic_ip = (void *)jffs_find_file(c, raw_inode->ino);

	insert_inode_hash(inode);

	return inode;
}

/* Get statistics of the file system.  */
int
jffs_statfs(struct super_block *sb, struct statfs *buf)
{
	struct jffs_control *c = (struct jffs_control *) sb->u.generic_sbp;
	struct jffs_fmcontrol *fmc = c->fmc;

	D2(printk("jffs_statfs()\n"));

	buf->f_type = JFFS_MAGIC_SB_BITMASK;
	buf->f_bsize = PAGE_CACHE_SIZE;
	buf->f_blocks = (fmc->flash_size / PAGE_CACHE_SIZE)
		       - (fmc->min_free_size / PAGE_CACHE_SIZE);
	buf->f_bfree = (jffs_free_size1(fmc) / PAGE_CACHE_SIZE
		       + jffs_free_size2(fmc) / PAGE_CACHE_SIZE)
		      - (fmc->min_free_size / PAGE_CACHE_SIZE);
	buf->f_bavail = buf->f_bfree;

	/* Find out how many files there are in the filesystem.  */
	buf->f_files = jffs_foreach_file(c, jffs_file_count);
	buf->f_ffree = buf->f_bfree;
	/* buf->f_fsid = 0; */
	buf->f_namelen = JFFS_MAX_NAME_LEN;
	return 0;
}


/* Rename a file.  */
int
jffs_rename(struct inode *old_dir, struct dentry *old_dentry,
	    struct inode *new_dir, struct dentry *new_dentry)
{
	struct jffs_raw_inode raw_inode;
	struct jffs_control *c;
	struct jffs_file *old_dir_f;
	struct jffs_file *new_dir_f;
	struct jffs_file *del_f;
	struct jffs_file *f;
	struct jffs_node *node;
	struct inode *inode;
	int result = 0;
	__u32 rename_data = 0;

	D2(printk("***jffs_rename()\n"));

	D(printk("jffs_rename(): old_dir: 0x%p, old name: 0x%p, "
		 "new_dir: 0x%p, new name: 0x%p\n",
		 old_dir, old_dentry->d_name.name,
		 new_dir, new_dentry->d_name.name));

	c = (struct jffs_control *)old_dir->i_sb->u.generic_sbp;
	ASSERT(if (!c) {
		printk(KERN_ERR "jffs_rename(): The old_dir inode "
		       "didn't have a reference to a jffs_file struct\n");
		return -1;
	});

	if (!JFFS_ENOUGH_SPACE(c)) {
		D1(printk("jffs_rename(): Free size = %u\n",
			  jffs_free_size1(c->fmc) + jffs_free_size2(c->fmc)));
		D(printk(KERN_NOTICE "JFFS: No space left on device\n"));
		return -ENOSPC;
	}

	/* Find the old directory.  */
	result = -ENOTDIR;
	if (!(old_dir_f = (struct jffs_file *)old_dir->u.generic_ip)) {
		D(printk("jffs_rename(): Old dir invalid.\n"));
		goto jffs_rename_end;
	}

	/* Try to find the file to move.  */
	result = -ENOENT;
	if (!(f = jffs_find_child(old_dir_f, old_dentry->d_name.name,
				  old_dentry->d_name.len))) {
		goto jffs_rename_end;
	}

	/* Find the new directory.  */
	result = -ENOTDIR;
	if (!(new_dir_f = (struct jffs_file *)new_dir->u.generic_ip)) {
		D(printk("jffs_rename(): New dir invalid.\n"));
		goto jffs_rename_end;
	}

	/* Create a node and initialize as much as needed.  */
	result = -ENOMEM;
	if (!(node = (struct jffs_node *) kmalloc(sizeof(struct jffs_node),
						  GFP_KERNEL))) {
		D(printk("jffs_rename(): Allocation failed: node == 0\n"));
		goto jffs_rename_end;
	}
	DJM(no_jffs_node++);
	node->data_offset = 0;
	node->removed_size = 0;

	/* Initialize the raw inode.  */
	raw_inode.magic = JFFS_MAGIC_BITMASK;
	raw_inode.ino = f->ino;
	raw_inode.pino = new_dir_f->ino;
	raw_inode.version = f->highest_version + 1;
	raw_inode.mode = f->mode;
	raw_inode.uid = current->fsuid;
	raw_inode.gid = current->fsgid;
#if 0
	raw_inode.uid = f->uid;
	raw_inode.gid = f->gid;
#endif
	raw_inode.atime = CURRENT_TIME;
	raw_inode.mtime = raw_inode.atime;
	raw_inode.ctime = f->ctime;
	raw_inode.offset = 0;
	raw_inode.dsize = 0;
	raw_inode.rsize = 0;
	raw_inode.nsize = new_dentry->d_name.len;
	raw_inode.nlink = f->nlink;
	raw_inode.spare = 0;
	raw_inode.rename = 0;
	raw_inode.deleted = 0;

	/* See if there already exists a file with the same name as
	   new_name.  */
	if ((del_f = jffs_find_child(new_dir_f, new_dentry->d_name.name,
				     new_dentry->d_name.len))) {
		raw_inode.rename = 1;
		raw_inode.dsize = sizeof(__u32);
		rename_data = del_f->ino;
	}

	/* Write the new node to the flash memory.  */
	if ((result = jffs_write_node(c, node, &raw_inode,
				      new_dentry->d_name.name,
				      (unsigned char*)&rename_data)) < 0) {
		D(printk("jffs_rename(): Failed to write node to flash.\n"));
		kfree(node);
		DJM(no_jffs_node--);
		goto jffs_rename_end;
	}
	raw_inode.dsize = 0;

	if (raw_inode.rename) {
		/* The file with the same name must be deleted.  */
	        down(&c->fmc->gclock);
		if ((result = jffs_remove(new_dir, new_dentry,
					  del_f->mode)) < 0) {
			/* This is really bad.  */
			printk(KERN_ERR "JFFS: An error occurred in "
			       "rename().\n");
		}
		up(&c->fmc->gclock);
	}

	if (old_dir_f != new_dir_f) {
		/* Remove the file from its old position in the
		   filesystem tree.  */
		jffs_unlink_file_from_tree(f);
	}

	/* Insert the new node into the file system.  */
	if ((result = jffs_insert_node(c, f, &raw_inode,
				       new_dentry->d_name.name, node)) < 0) {
		D(printk(KERN_ERR "jffs_rename(): jffs_insert_node() "
			 "failed!\n"));
	}

	if (old_dir_f != new_dir_f) {
		/* Insert the file to its new position in the
		   file system.  */
		jffs_insert_file_into_tree(f);
	}

	/* This is a kind of update of the inode we're about to make
	   here.  This is what they do in ext2fs.  Kind of.  */
	if ((inode = iget(new_dir->i_sb, f->ino))) {
		inode->i_ctime = CURRENT_TIME;
		mark_inode_dirty(inode);
		iput(inode);
	}

jffs_rename_end:
	return result;
} /* jffs_rename()  */


/* Read the contents of a directory.  Used by programs like `ls'
   for instance.  */
static int
jffs_readdir(struct file *filp, void *dirent, filldir_t filldir)
{
	struct jffs_file *f;
	struct dentry *dentry = filp->f_dentry;
	struct inode *inode = dentry->d_inode;
	int j;
	int ddino;

	D2(printk("jffs_readdir(): inode: 0x%p, filp: 0x%p\n", inode, filp));
	if (filp->f_pos == 0) {
		D3(printk("jffs_readdir(): \".\" %lu\n", inode->i_ino));
		if (filldir(dirent, ".", 1, filp->f_pos, inode->i_ino) < 0) {
			return 0;
		}
		filp->f_pos = 1;
	}
	if (filp->f_pos == 1) {
		if (inode->i_ino == JFFS_MIN_INO) {
			ddino = JFFS_MIN_INO;
		}
		else {
			ddino = ((struct jffs_file *)
				 inode->u.generic_ip)->pino;
		}
		D3(printk("jffs_readdir(): \"..\" %u\n", ddino));
		if (filldir(dirent, "..", 2, filp->f_pos, ddino) < 0)
			return 0;
		filp->f_pos++;
	}
	f = ((struct jffs_file *)inode->u.generic_ip)->children;
	for (j = 2; (j < filp->f_pos) && f; j++) {
	        f = f->sibling_next;
	}
	for (; f ; f = f->sibling_next) {
		D3(printk("jffs_readdir(): \"%s\" ino: %u\n",
			  (f->name ? f->name : ""), f->ino));
		if (filldir(dirent, f->name, f->nsize,
			    filp->f_pos , f->ino) < 0)
			return 0;
		filp->f_pos++;
	}

	return filp->f_pos;
} /* jffs_readdir()  */


/* Find a file in a directory. If the file exists, return its
   corresponding dentry.  */
static struct dentry *
jffs_lookup(struct inode *dir, struct dentry *dentry)
{
	struct jffs_file *d;
	struct jffs_file *f;
	int len;
	int r = 0;
	const char *name;
	struct inode *inode = NULL;

	len = dentry->d_name.len;
	name = dentry->d_name.name;

	D3({
		char *s = (char *)kmalloc(len + 1, GFP_KERNEL);
		memcpy(s, name, len);
		s[len] = '\0';
		printk("jffs_lookup(): dir: 0x%p, name: \"%s\"\n", dir, s);
		kfree(s);
	});

	r = -ENAMETOOLONG;
	if (len > JFFS_MAX_NAME_LEN) {
		goto jffs_lookup_end;
	}

	r = -EACCES;
	if (!(d = (struct jffs_file *)dir->u.generic_ip)) {
		D(printk("jffs_lookup(): No such inode! (%lu)\n",
			 dir->i_ino));
		goto jffs_lookup_end;
	}

	/* Get the corresponding inode to the file.  */
	if ((len == 1) && (name[0] == '.')) {
		if (!(inode = iget(dir->i_sb, d->ino))) {
			D(printk("jffs_lookup(): . iget() ==> NULL\n"));
			goto jffs_lookup_end;
		}
	} else if ((len == 2) && (name[0] == '.') && (name[1] == '.')) {
		if (!(inode = iget(dir->i_sb, d->pino))) {
			D(printk("jffs_lookup(): .. iget() ==> NULL\n"));
			goto jffs_lookup_end;
		}
	} else if ((f = jffs_find_child(d, name, len))) {
		if (!(inode = iget(dir->i_sb, f->ino))) {
			D(printk("jffs_lookup(): iget() ==> NULL\n"));
			goto jffs_lookup_end;
		}
	} else {
		D3(printk("jffs_lookup(): Couldn't find the file. "
			  "f = 0x%p, name = \"%s\", d = 0x%p, d->ino = %u\n",
			  f, name, d, d->ino));
		inode = NULL;
	}

	d_add(dentry, inode);
	return NULL;

jffs_lookup_end:
	return ERR_PTR(r);
} /* jffs_lookup()  */


/* Try to read a page of data from a file.  */
static int
jffs_readpage(struct file *file, struct page *page)
{
	void *buf;
	unsigned long read_len;
	int result = -EIO;
	struct inode *inode = (struct inode*)page->mapping->host;
	struct jffs_file *f = (struct jffs_file *)inode->u.generic_ip;
	int r;
	loff_t offset;

	D2(printk("***jffs_readpage(): file = \"%s\", page->index = %lu\n",
		  (f->name ? f->name : ""), (long)page->index));

	get_page(page);
	/* Don't LockPage(page), should be locked already */
	buf = page_address(page);
	ClearPageUptodate(page);
	ClearPageError(page);

	offset = page->index << PAGE_CACHE_SHIFT;
	if (offset < inode->i_size) {
		read_len = jffs_min(inode->i_size - offset, PAGE_SIZE);
		r = jffs_read_data(f, buf, offset, read_len);
		if (r == read_len) {
			if (read_len < PAGE_SIZE) {
				memset(buf + read_len, 0,
				       PAGE_SIZE - read_len);
			}
			SetPageUptodate(page);
			result = 0;
		}
		D(else {
			printk("***jffs_readpage(): Read error! "
			       "Wanted to read %lu bytes but only "
			       "read %d bytes.\n", read_len, r);
		});
	}
	if (result) {
		memset(buf, 0, PAGE_SIZE);
	        SetPageError(page);
	}
	flush_dcache_page(page);

	UnlockPage(page);

	put_page(page);

	D3(printk("jffs_readpage(): Leaving...\n"));

	return result;
} /* jffs_readpage()  */


/* Create a new directory.  */
static int
jffs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
{
	struct jffs_raw_inode raw_inode;
	struct jffs_control *c;
	struct jffs_node *node;
	struct jffs_file *dir_f;
	struct inode *inode;
	int dir_mode;
	int result = 0;
	int err;

	D1({
	        int len = dentry->d_name.len;
		char *_name = (char *) kmalloc(len + 1, GFP_KERNEL);
		memcpy(_name, dentry->d_name.name, len);
		_name[len] = '\0';
		printk("***jffs_mkdir(): dir = 0x%p, name = \"%s\", "
		       "len = %d, mode = 0x%08x\n", dir, _name, len, mode);
		kfree(_name);
	});

	dir_f = (struct jffs_file *)dir->u.generic_ip;
	ASSERT(if (!dir_f) {
		printk(KERN_ERR "jffs_mkdir(): No reference to a "
		       "jffs_file struct in inode.\n");
		result = -1;
		goto jffs_mkdir_end;
	});

	c = dir_f->c;

	if (!JFFS_ENOUGH_SPACE(c)) {
		D1(printk("jffs_mkdir(): Free size = %u\n",
			  jffs_free_size1(c->fmc) + jffs_free_size2(c->fmc)));
		D(printk(KERN_NOTICE "JFFS: No space left on device\n"));
		result = -ENOSPC;
		goto jffs_mkdir_end;
	}

	dir_mode = S_IFDIR | (mode & (S_IRWXUGO|S_ISVTX)
			      & ~current->fs->umask);
	if (dir->i_mode & S_ISGID) {
		dir_mode |= S_ISGID;
	}

	/* Create a node and initialize it as much as needed.  */
	if (!(node = (struct jffs_node *) kmalloc(sizeof(struct jffs_node),
						  GFP_KERNEL))) {
		D(printk("jffs_mkdir(): Allocation failed: node == 0\n"));
		result = -ENOMEM;
		goto jffs_mkdir_end;
	}
	DJM(no_jffs_node++);
	node->data_offset = 0;
	node->removed_size = 0;

	/* Initialize the raw inode.  */
	raw_inode.magic = JFFS_MAGIC_BITMASK;
	raw_inode.ino = c->next_ino++;
	raw_inode.pino = dir_f->ino;
	raw_inode.version = 1;
	raw_inode.mode = dir_mode;
	raw_inode.uid = current->fsuid;
	raw_inode.gid = (dir->i_mode & S_ISGID) ? dir->i_gid : current->fsgid;
	/*	raw_inode.gid = current->fsgid; */
	raw_inode.atime = CURRENT_TIME;
	raw_inode.mtime = raw_inode.atime;
	raw_inode.ctime = raw_inode.atime;
	raw_inode.offset = 0;
	raw_inode.dsize = 0;
	raw_inode.rsize = 0;
	raw_inode.nsize = dentry->d_name.len;
	raw_inode.nlink = 1;
	raw_inode.spare = 0;
	raw_inode.rename = 0;
	raw_inode.deleted = 0;

	/* Write the new node to the flash.  */
	if ((result = jffs_write_node(c, node, &raw_inode,
				      dentry->d_name.name, 0)) < 0) {
		D(printk("jffs_mkdir(): jffs_write_node() failed.\n"));
		kfree(node);
		DJM(no_jffs_node--);
		goto jffs_mkdir_end;
	}

	/* Insert the new node into the file system.  */
	if ((result = jffs_insert_node(c, 0, &raw_inode, dentry->d_name.name,
				       node)) < 0) {
		goto jffs_mkdir_end;
	}

	inode = jffs_new_inode(dir, &raw_inode, &err);
	if (inode == NULL) {
		result = err;
		goto jffs_mkdir_end;
	}

	inode->i_op = &jffs_dir_inode_operations;
	inode->i_fop = &jffs_dir_operations;

	mark_inode_dirty(dir);
	d_instantiate(dentry, inode);

	result = 0;
jffs_mkdir_end:
	return result;
} /* jffs_mkdir()  */


/* Remove a directory.  */
static int
jffs_rmdir(struct inode *dir, struct dentry *dentry)
{
	D3(printk("***jffs_rmdir()\n"));
	return jffs_remove(dir, dentry, S_IFDIR);
}


/* Remove any kind of file except for directories.  */
static int
jffs_unlink(struct inode *dir, struct dentry *dentry)
{
	D3(printk("***jffs_unlink()\n"));
	return jffs_remove(dir, dentry, 0);
}


/* Remove a JFFS entry, i.e. plain files, directories, etc.  Here we
   shouldn't test for free space on the device.  */
static int
jffs_remove(struct inode *dir, struct dentry *dentry, int type)
{
	struct jffs_raw_inode raw_inode;
	struct jffs_control *c;
	struct jffs_file *dir_f; /* The file-to-remove's parent.  */
	struct jffs_file *del_f; /* The file to remove.  */
	struct jffs_node *del_node;
	struct inode *inode = 0;
	int result = 0;

	D1({
	        int len = dentry->d_name.len;
	        const char *name = dentry->d_name.name;
		char *_name = (char *) kmalloc(len + 1, GFP_KERNEL);
		memcpy(_name, name, len);
		_name[len] = '\0';
		printk("***jffs_remove(): file = \"%s\"\n", _name);
		kfree(_name);
	});

	dir_f = (struct jffs_file *) dir->u.generic_ip;
	c = dir_f->c;

	result = -ENOENT;
	if (!(del_f = jffs_find_child(dir_f, dentry->d_name.name,
				      dentry->d_name.len))) {
		D(printk("jffs_remove(): jffs_find_child() failed.\n"));
		goto jffs_remove_end;
	}

	if (S_ISDIR(type)) {
		if (del_f->children) {
			result = -ENOTEMPTY;
			goto jffs_remove_end;
		}
	}
	else if (S_ISDIR(del_f->mode)) {
		D(printk("jffs_remove(): node is a directory "
			 "but it shouldn't be.\n"));
		result = -EPERM;
		goto jffs_remove_end;
	}

	inode = dentry->d_inode;

	result = -EIO;
	if (del_f->ino != inode->i_ino)
		goto jffs_remove_end;

	if (!inode->i_nlink) {
		printk("Deleting nonexistent file inode: %lu, nlink: %d\n",
		       inode->i_ino, inode->i_nlink);
		inode->i_nlink=1;
	}

	/* Create a node for the deletion.  */
	result = -ENOMEM;
	if (!(del_node = (struct jffs_node *)
			 kmalloc(sizeof(struct jffs_node), GFP_KERNEL))) {
		D(printk("jffs_remove(): Allocation failed!\n"));
		goto jffs_remove_end;
	}
	DJM(no_jffs_node++);
	del_node->data_offset = 0;
	del_node->removed_size = 0;

	/* Initialize the raw inode.  */
	raw_inode.magic = JFFS_MAGIC_BITMASK;
	raw_inode.ino = del_f->ino;
	raw_inode.pino = del_f->pino;
	raw_inode.version = del_f->highest_version + 1;
	raw_inode.mode = del_f->mode;
	raw_inode.uid = current->fsuid;
	raw_inode.gid = current->fsgid;
	raw_inode.atime = CURRENT_TIME;
	raw_inode.mtime = del_f->mtime;
	raw_inode.ctime = raw_inode.atime;
	raw_inode.offset = 0;
	raw_inode.dsize = 0;
	raw_inode.rsize = 0;
	raw_inode.nsize = 0;
	raw_inode.nlink = del_f->nlink;
	raw_inode.spare = 0;
	raw_inode.rename = 0;
	raw_inode.deleted = 1;

	/* Write the new node to the flash memory.  */
	if (jffs_write_node(c, del_node, &raw_inode, 0, 0) < 0) {
		kfree(del_node);
		DJM(no_jffs_node--);
		result = -EIO;
		goto jffs_remove_end;
	}

	/* Update the file.  This operation will make the file disappear
	   from the in-memory file system structures.  */
	jffs_insert_node(c, del_f, &raw_inode, 0, del_node);

	dir->i_version = ++event;
	dir->i_ctime = dir->i_mtime = CURRENT_TIME;
	mark_inode_dirty(dir);
	inode->i_nlink--;
	if (inode->i_nlink == 0) {
		inode->u.generic_ip = 0;
	}
	inode->i_ctime = dir->i_ctime;
	mark_inode_dirty(inode);

	d_delete(dentry);	/* This also frees the inode */

	result = 0;
jffs_remove_end:
	return result;
} /* jffs_remove()  */


static int
jffs_mknod(struct inode *dir, struct dentry *dentry, int mode, int rdev)
{
	struct jffs_raw_inode raw_inode;
	struct jffs_file *dir_f;
	struct jffs_node *node = 0;
	struct jffs_control *c;
	struct inode *inode;
	int result = 0;
	kdev_t dev = to_kdev_t(rdev);
	int err;

	D1(printk("***jffs_mknod()\n"));

	dir_f = (struct jffs_file *)dir->u.generic_ip;
	c = dir_f->c;

	if (!JFFS_ENOUGH_SPACE(c)) {
		D1(printk("jffs_mknod(): Free size = %u\n",
			  jffs_free_size1(c->fmc) + jffs_free_size2(c->fmc)));
		D(printk(KERN_NOTICE "JFFS: No space left on device\n"));
		result = -ENOSPC;
		goto jffs_mknod_end;
	}

	/* Create and initialize a new node.  */
	if (!(node = (struct jffs_node *) kmalloc(sizeof(struct jffs_node),
						  GFP_KERNEL))) {
		D(printk("jffs_mknod(): Allocation failed!\n"));
		result = -ENOMEM;
		goto jffs_mknod_err;
	}
	DJM(no_jffs_node++);
	node->data_offset = 0;
	node->removed_size = 0;

	/* Initialize the raw inode.  */
	raw_inode.magic = JFFS_MAGIC_BITMASK;
	raw_inode.ino = c->next_ino++;
	raw_inode.pino = dir_f->ino;
	raw_inode.version = 1;
	raw_inode.mode = mode;
	raw_inode.uid = current->fsuid;
	raw_inode.gid = (dir->i_mode & S_ISGID) ? dir->i_gid : current->fsgid;
	/*	raw_inode.gid = current->fsgid; */
	raw_inode.atime = CURRENT_TIME;
	raw_inode.mtime = raw_inode.atime;
	raw_inode.ctime = raw_inode.atime;
	raw_inode.offset = 0;
	raw_inode.dsize = sizeof(kdev_t);
	raw_inode.rsize = 0;
	raw_inode.nsize = dentry->d_name.len;
	raw_inode.nlink = 1;
	raw_inode.spare = 0;
	raw_inode.rename = 0;
	raw_inode.deleted = 0;

	/* Write the new node to the flash.  */
	if ((err = jffs_write_node(c, node, &raw_inode, dentry->d_name.name,
				  (unsigned char *)&dev)) < 0) {
		D(printk("jffs_mknod(): jffs_write_node() failed.\n"));
		result = err;
		goto jffs_mknod_err;
	}

	/* Insert the new node into the file system.  */
	if ((err = jffs_insert_node(c, 0, &raw_inode, dentry->d_name.name,
				    node)) < 0) {
		result = err;
		goto jffs_mknod_end;
	}

	inode = jffs_new_inode(dir, &raw_inode, &err);
	if (inode == NULL) {
		result = err;
		goto jffs_mknod_end;
	}

	init_special_inode(inode, mode, rdev);

	d_instantiate(dentry, inode);

	goto jffs_mknod_end;

jffs_mknod_err:
	if (node) {
		kfree(node);
		DJM(no_jffs_node--);
	}

jffs_mknod_end:
	return result;
} /* jffs_mknod()  */


static int
jffs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
{
	struct jffs_raw_inode raw_inode;
	struct jffs_control *c;
	struct jffs_file *dir_f;
	struct jffs_node *node;
	struct inode *inode;

	int symname_len = strlen(symname);
	int err;

	D1({
	        int len = dentry->d_name.len;
		char *_name = (char *)kmalloc(len + 1, GFP_KERNEL);
		char *_symname = (char *)kmalloc(symname_len + 1, GFP_KERNEL);
		memcpy(_name, dentry->d_name.name, len);
		_name[len] = '\0';
		memcpy(_symname, symname, symname_len);
		_symname[symname_len] = '\0';
		printk("***jffs_symlink(): dir = 0x%p, "
		       "dentry->dname.name = \"%s\", "
		       "symname = \"%s\"\n", dir, _name, _symname);
		kfree(_name);
		kfree(_symname);
	});

	dir_f = (struct jffs_file *)dir->u.generic_ip;
	ASSERT(if (!dir_f) {
		printk(KERN_ERR "jffs_symlink(): No reference to a "
		       "jffs_file struct in inode.\n");
		return -1;
	});

	c = dir_f->c;

	if (!JFFS_ENOUGH_SPACE(c)) {
		D1(printk("jffs_symlink(): Free size = %u\n",
			  jffs_free_size1(c->fmc) + jffs_free_size2(c->fmc)));
		D(printk(KERN_NOTICE "JFFS: No space left on device\n"));
		return -ENOSPC;
	}

	/* Create a node and initialize it as much as needed.  */
	if (!(node = (struct jffs_node *) kmalloc(sizeof(struct jffs_node),
						  GFP_KERNEL))) {
		D(printk("jffs_symlink(): Allocation failed: node = NULL\n"));
		return -ENOMEM;
	}
	DJM(no_jffs_node++);
	node->data_offset = 0;
	node->removed_size = 0;

	/* Initialize the raw inode.  */
	raw_inode.magic = JFFS_MAGIC_BITMASK;
	raw_inode.ino = c->next_ino++;
	raw_inode.pino = dir_f->ino;
	raw_inode.version = 1;
	raw_inode.mode = S_IFLNK | S_IRWXUGO;
	raw_inode.uid = current->fsuid;
	raw_inode.gid = (dir->i_mode & S_ISGID) ? dir->i_gid : current->fsgid;
	raw_inode.atime = CURRENT_TIME;
	raw_inode.mtime = raw_inode.atime;
	raw_inode.ctime = raw_inode.atime;
	raw_inode.offset = 0;
	raw_inode.dsize = symname_len;
	raw_inode.rsize = 0;
	raw_inode.nsize = dentry->d_name.len;
	raw_inode.nlink = 1;
	raw_inode.spare = 0;
	raw_inode.rename = 0;
	raw_inode.deleted = 0;

	/* Write the new node to the flash.  */
	if ((err = jffs_write_node(c, node, &raw_inode, dentry->d_name.name,
				   (const unsigned char *)symname)) < 0) {
		D(printk("jffs_symlink(): jffs_write_node() failed.\n"));
		kfree(node);
		DJM(no_jffs_node--);
		return err;
	}

	/* Insert the new node into the file system.  */
	if ((err = jffs_insert_node(c, 0, &raw_inode, dentry->d_name.name,
				    node)) < 0) {
		return err;
	}

	inode = jffs_new_inode(dir, &raw_inode, &err);
	if (inode == NULL) {
		return err;
	}

	inode->i_op = &page_symlink_inode_operations;
	inode->i_mapping->a_ops = &jffs_address_operations;

	d_instantiate(dentry, inode);

	return 0;
} /* jffs_symlink()  */


/* Create an inode inside a JFFS directory (dir) and return it.
 *
 * By the time this is called, we already have created
 * the directory cache entry for the new file, but it
 * is so far negative - it has no inode.
 *
 * If the create succeeds, we fill in the inode information
 * with d_instantiate().
 */
static int
jffs_create(struct inode *dir, struct dentry *dentry, int mode)
{
	struct jffs_raw_inode raw_inode;
	struct jffs_control *c;
	struct jffs_node *node;
	struct jffs_file *dir_f; /* JFFS representation of the directory.  */
	struct inode *inode;
	int err;

	D1({
	        int len = dentry->d_name.len;
		char *s = (char *)kmalloc(len + 1, GFP_KERNEL);
		memcpy(s, dentry->d_name.name, len);
		s[len] = '\0';
		printk("jffs_create(): dir: 0x%p, name: \"%s\"\n", dir, s);
		kfree(s);
	});

	dir_f = (struct jffs_file *)dir->u.generic_ip;
	ASSERT(if (!dir_f) {
		printk(KERN_ERR "jffs_create(): No reference to a "
		       "jffs_file struct in inode.\n");
		return -1;
	});

	c = dir_f->c;

	if (!JFFS_ENOUGH_SPACE(c)) {
		D1(printk("jffs_create(): Free size = %u\n",
			  jffs_free_size1(c->fmc) + jffs_free_size2(c->fmc)));
		D(printk(KERN_NOTICE "JFFS: No space left on device\n"));
		return -ENOSPC;
	}

	/* Create a node and initialize as much as needed.  */
	if (!(node = (struct jffs_node *) kmalloc(sizeof(struct jffs_node),
						  GFP_KERNEL))) {
		D(printk("jffs_create(): Allocation failed: node == 0\n"));
		return -ENOMEM;
	}
	DJM(no_jffs_node++);
	node->data_offset = 0;
	node->removed_size = 0;

	/* Initialize the raw inode.  */
	raw_inode.magic = JFFS_MAGIC_BITMASK;
	raw_inode.ino = c->next_ino++;
	raw_inode.pino = dir_f->ino;
	raw_inode.version = 1;
	raw_inode.mode = mode;
	raw_inode.uid = current->fsuid;
	raw_inode.gid = (dir->i_mode & S_ISGID) ? dir->i_gid : current->fsgid;
	raw_inode.atime = CURRENT_TIME;
	raw_inode.mtime = raw_inode.atime;
	raw_inode.ctime = raw_inode.atime;
	raw_inode.offset = 0;
	raw_inode.dsize = 0;
	raw_inode.rsize = 0;
	raw_inode.nsize = dentry->d_name.len;
	raw_inode.nlink = 1;
	raw_inode.spare = 0;
	raw_inode.rename = 0;
	raw_inode.deleted = 0;

	/* Write the new node to the flash.  */
	if ((err = jffs_write_node(c, node, &raw_inode,
				   dentry->d_name.name, 0)) < 0) {
		D(printk("jffs_create(): jffs_write_node() failed.\n"));
		kfree(node);
		DJM(no_jffs_node--);
		return err;
	}

	/* Insert the new node into the file system.  */
	if ((err = jffs_insert_node(c, 0, &raw_inode, dentry->d_name.name,
				    node)) < 0) {
		return err;
	}

	/* Initialize an inode.  */
	inode = jffs_new_inode(dir, &raw_inode, &err);
	if (inode == NULL) {
		return err;
	}

	inode->i_op = &jffs_file_inode_operations;
	inode->i_fop = &jffs_file_operations;
	inode->i_mapping->a_ops = &jffs_address_operations;
	inode->i_mapping->nrpages = 0;

	d_instantiate(dentry, inode);

	return 0;
} /* jffs_create()  */


/* Write, append or rewrite data to an existing file.  */
static ssize_t
jffs_file_write(struct file *filp, const char *buf, size_t count,
		loff_t *ppos)
{
	struct jffs_raw_inode raw_inode;
	struct jffs_control *c;
	struct jffs_file *f;
	struct jffs_node *node;
	struct dentry *dentry = filp->f_dentry;
	struct inode *inode = dentry->d_inode;
	unsigned char *vbuf;
	int written = 0;
	loff_t pos;
	int err;

	inode = filp->f_dentry->d_inode;

	D2(printk("***jffs_file_write(): inode: 0x%p (ino: %lu), "
		  "filp: 0x%p, buf: 0x%p, count: %d\n",
		  inode, inode->i_ino, filp, buf, count));

	down(&inode->i_sem);

	pos = *ppos;
	err = -EINVAL;
	if (pos < 0)
		goto out;

	err = filp->f_error;
	if (err) {
		filp->f_error = 0;
		goto out;
	}

	if (inode->i_sb->s_flags & MS_RDONLY) {
		D(printk("jffs_file_write(): MS_RDONLY\n"));
		err = -ENOSPC;
		goto out;
	}

	if (!S_ISREG(inode->i_mode)) {
		D(printk("jffs_file_write(): inode->i_mode == 0x%08x\n",
			 inode->i_mode));
		err = -EINVAL;
		goto out;
	}

	if (!(f = (struct jffs_file *)inode->u.generic_ip)) {
		D(printk("jffs_file_write(): inode->u.generic_ip = 0x%p\n",
			 inode->u.generic_ip));
		err = -EINVAL;
		goto out;
	}

	c = f->c;

	if (!JFFS_ENOUGH_SPACE(c)) {
		D1(printk("jffs_file_write(): Free size = %u\n",
			  jffs_free_size1(c->fmc) + jffs_free_size2(c->fmc)));
		D(printk(KERN_NOTICE "JFFS: No space left on device\n"));
		err = -ENOSPC;
		goto out;
	}

	if (filp->f_flags & O_APPEND)
		pos = inode->i_size;


	if (!(vbuf = kmalloc(count, GFP_KERNEL))) {
		D(printk("jffs_file_write(): failed to allocate bounce buffer. Fix me to use page cache\n"));
		err = -ENOMEM;
		goto out;
	}

	/* FIXME: This is entirely gratuitous use of bounce buffers.
	   Get a clue and use the page cache. 
	   /me wanders off to get a crash course on Linux VFS
	   dwmw2
	*/
	if (copy_from_user(vbuf, buf, count)) {
		kfree(vbuf);
		return -EFAULT;
	}
		

	/* Things are going to be written so we could allocate and
	   initialize the necessary data structures now.  */
	if (!(node = (struct jffs_node *) kmalloc(sizeof(struct jffs_node),
						  GFP_KERNEL))) {
		D(printk("jffs_file_write(): node == 0\n"));
		err = -ENOMEM;
		kfree(vbuf);
		goto out;
	}
	DJM(no_jffs_node++);
	node->data_offset = pos;
	node->removed_size = 0;

	/* Initialize the raw inode.  */
	raw_inode.magic = JFFS_MAGIC_BITMASK;
	raw_inode.ino = f->ino;
	raw_inode.pino = f->pino;
	raw_inode.version = f->highest_version + 1;
	raw_inode.mode = f->mode;

	raw_inode.uid = f->uid;
	raw_inode.gid = f->gid;
	/*
	raw_inode.uid = current->fsuid;
	raw_inode.gid = current->fsgid;
	*/
	raw_inode.atime = CURRENT_TIME;
	raw_inode.mtime = raw_inode.atime;
	raw_inode.ctime = f->ctime;
	raw_inode.offset = pos;
	raw_inode.dsize = count;
	raw_inode.rsize = 0;
	raw_inode.nsize = 0;
	raw_inode.nlink = f->nlink;
	raw_inode.spare = 0;
	raw_inode.rename = 0;
	raw_inode.deleted = 0;

	if (pos < f->size) {
		node->removed_size = raw_inode.rsize = jffs_min(count, f->size - pos);
	}

	/* Write the new node to the flash.  */
	if ((written = jffs_write_node(c, node, &raw_inode, 0,
				       (const unsigned char *)vbuf)) < 0) {
		D(printk("jffs_file_write(): jffs_write_node() failed.\n"));
		kfree(node);
		kfree(vbuf);
		DJM(no_jffs_node--);
		err = written;
		goto out;
	}

	kfree(vbuf);

	/* Insert the new node into the file system.  */
	if ((err = jffs_insert_node(c, f, &raw_inode, 0, node)) < 0) {
		goto out;
	}

	pos += written;
	*ppos = pos;

	D3(printk("jffs_file_write(): new f_pos %ld.\n", (long)pos));

	/* Fix things in the real inode.  */
	if (pos > inode->i_size) {
		inode->i_size = pos;
	}
	inode->i_ctime = inode->i_mtime = CURRENT_TIME;
	mark_inode_dirty(inode);
	invalidate_inode_pages(inode);

	err = written;
out:
	up(&inode->i_sem);
	return err;
} /* jffs_file_write()  */


/* This is our ioctl() routine.  */
static int
jffs_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
	   unsigned long arg)
{
	struct jffs_control *c;

	D2(printk("***jffs_ioctl(): cmd = 0x%08x, arg = 0x%08lx\n",
		  cmd, arg));

	if (!(c = (struct jffs_control *)inode->i_sb->u.generic_sbp)) {
		printk(KERN_ERR "JFFS: Bad inode in ioctl() call. "
		       "(cmd = 0x%08x)\n", cmd);
		return -EIO;
	}

	switch (cmd) {
	case JFFS_PRINT_HASH:
		jffs_print_hash_table(c);
		break;
	case JFFS_PRINT_TREE:
		jffs_print_tree(c->root, 0);
		break;
	case JFFS_GET_STATUS:
		{
			struct jffs_flash_status fst;
			struct jffs_fmcontrol *fmc = c->fmc;
			printk("Flash status -- ");
			if (!access_ok(VERIFY_WRITE,
				       (struct jffs_flash_status *)arg,
				       sizeof(struct jffs_flash_status))) {
				D(printk("jffs_ioctl(): Bad arg in "
					 "JFFS_GET_STATUS ioctl!\n"));
				return -EFAULT;
			}
			fst.size = fmc->flash_size;
			fst.used = fmc->used_size;
			fst.dirty = fmc->dirty_size;
			fst.begin = fmc->head->offset;
			fst.end = fmc->tail->offset + fmc->tail->size;
			printk("size: %d, used: %d, dirty: %d, "
			       "begin: %d, end: %d\n",
			       fst.size, fst.used, fst.dirty,
			       fst.begin, fst.end);
			if (copy_to_user((struct jffs_flash_status *)arg,
					 &fst,
					 sizeof(struct jffs_flash_status))) {
			  return -EFAULT;
			}
		}
		break;
	default:
		return -ENOTTY;
	}

	return 0;
} /* jffs_ioctl()  */


static struct address_space_operations jffs_address_operations = {
	readpage: jffs_readpage,
};

static int jffs_fsync(struct file *f, struct dentry *d, int datasync)
{
	/* We currently have O_SYNC operations at all times. 
	   Do nothing
	*/
	return 0;
}


static struct file_operations jffs_file_operations =
{
	read:  generic_file_read,    /* read */
	write: jffs_file_write,      /* write */
	ioctl: jffs_ioctl,           /* ioctl */
	mmap:  generic_file_mmap,    /* mmap */
	fsync: jffs_fsync,
};


static struct inode_operations jffs_file_inode_operations =
{
	lookup:  jffs_lookup,          /* lookup */
	setattr: jffs_setattr,
};


static struct file_operations jffs_dir_operations =
{
	readdir:	jffs_readdir,
};


static struct inode_operations jffs_dir_inode_operations =
{
	create:   jffs_create,
	lookup:   jffs_lookup,
	unlink:   jffs_unlink,
	symlink:  jffs_symlink,
	mkdir:    jffs_mkdir,
	rmdir:    jffs_rmdir,
	mknod:    jffs_mknod,
	rename:   jffs_rename,
	setattr:  jffs_setattr,
};


/* Initialize an inode for the VFS.  */
static void
jffs_read_inode(struct inode *inode)
{
	struct jffs_file *f;
	struct jffs_control *c;

	D3(printk("jffs_read_inode(): inode->i_ino == %lu\n", inode->i_ino));

	if (!inode->i_sb) {
		D(printk("jffs_read_inode(): !inode->i_sb ==> "
			 "No super block!\n"));
		return;
	}
	c = (struct jffs_control *)inode->i_sb->u.generic_sbp;
	if (!(f = jffs_find_file(c, inode->i_ino))) {
		D(printk("jffs_read_inode(): No such inode (%lu).\n",
			 inode->i_ino));
		return;
	}
	inode->u.generic_ip = (void *)f;
	inode->i_mode = f->mode;
	inode->i_nlink = f->nlink;
	inode->i_uid = f->uid;
	inode->i_gid = f->gid;
	inode->i_size = f->size;
	inode->i_atime = f->atime;
	inode->i_mtime = f->mtime;
	inode->i_ctime = f->ctime;
	inode->i_blksize = PAGE_SIZE;
	inode->i_blocks = (inode->i_size + PAGE_SIZE - 1) >> PAGE_SHIFT;
	if (S_ISREG(inode->i_mode)) {
		inode->i_op = &jffs_file_inode_operations;
		inode->i_fop = &jffs_file_operations;
		inode->i_mapping->a_ops = &jffs_address_operations;
	}
	else if (S_ISDIR(inode->i_mode)) {
		inode->i_op = &jffs_dir_inode_operations;
		inode->i_fop = &jffs_dir_operations;
	}
	else if (S_ISLNK(inode->i_mode)) {
		inode->i_op = &page_symlink_inode_operations;
		inode->i_mapping->a_ops = &jffs_address_operations;
	}
	else {
		/* If the node is a device of some sort, then the number of
		   the device should be read from the flash memory and then
		   added to the inode's i_rdev member.  */
		kdev_t rdev;
		jffs_read_data(f, (char *)&rdev, 0, sizeof(kdev_t));
		init_special_inode(inode, inode->i_mode, kdev_t_to_nr(rdev));
	}
}


void
jffs_delete_inode(struct inode *inode)
{
	D3(printk("jffs_delete_inode(): inode->i_ino == %lu\n",
		  inode->i_ino));

	lock_kernel();
	inode->i_size = 0;
	clear_inode(inode);
	unlock_kernel();
}


void
jffs_write_super(struct super_block *sb)
{
	struct jffs_control *c = (struct jffs_control *)sb->u.generic_sbp;

	jffs_garbage_collect_trigger(c);
}


static struct super_operations jffs_ops =
{
	read_inode:   jffs_read_inode,
	delete_inode: jffs_delete_inode,
	put_super:    jffs_put_super,
	write_super:  jffs_write_super,
	statfs:       jffs_statfs,
};


static DECLARE_FSTYPE_DEV(jffs_fs_type, "jffs", jffs_read_super);

static int __init
init_jffs_fs(void)
{
	printk("JFFS version "
	       JFFS_VERSION_STRING
	       ", (C) 1999, 2000  Axis Communications AB\n");
	return register_filesystem(&jffs_fs_type);
}

static void __exit
exit_jffs_fs(void)
{
	unregister_filesystem(&jffs_fs_type);
}

EXPORT_NO_SYMBOLS;

module_init(init_jffs_fs)
module_exit(exit_jffs_fs)