fs/jffs2/dir.c - kernel/msm-4.9 - Gitiles

 /*
  * JFFS2 -- Journalling Flash File System, Version 2.
  *
  * Copyright (C) 2001-2003 Red Hat, Inc.
  *
  * Created by David Woodhouse <dwmw2@infradead.org>
  *
  * For licensing information, see the file 'LICENCE' in this directory.
  *
  * $Id: dir.c,v 1.86 2005/07/06 12:13:09 dwmw2 Exp $
  *
  */

 #include <linux/kernel.h>
 #include <linux/slab.h>
 #include <linux/sched.h>
 #include <linux/fs.h>
 #include <linux/crc32.h>
 #include <linux/jffs2.h>
 #include <linux/jffs2_fs_i.h>
 #include <linux/jffs2_fs_sb.h>
 #include <linux/time.h>
 #include "nodelist.h"

 static int jffs2_readdir (struct file *, void *, filldir_t);

 static int jffs2_create (struct inode *,struct dentry *,int,
 			 struct nameidata *);
 static struct dentry *jffs2_lookup (struct inode *,struct dentry *,
 				    struct nameidata *);
 static int jffs2_link (struct dentry *,struct inode *,struct dentry *);
 static int jffs2_unlink (struct inode *,struct dentry *);
 static int jffs2_symlink (struct inode *,struct dentry *,const char *);
 static int jffs2_mkdir (struct inode *,struct dentry *,int);
 static int jffs2_rmdir (struct inode *,struct dentry *);
 static int jffs2_mknod (struct inode *,struct dentry *,int,dev_t);
 static int jffs2_rename (struct inode *, struct dentry *,
                         struct inode *, struct dentry *);

 struct file_operations jffs2_dir_operations =
 {
 	.read =		generic_read_dir,
 	.readdir =	jffs2_readdir,
 	.ioctl =	jffs2_ioctl,
 	.fsync =	jffs2_fsync
 };


 struct inode_operations jffs2_dir_inode_operations =
 {
 	.create =	jffs2_create,
 	.lookup =	jffs2_lookup,
 	.link =		jffs2_link,
 	.unlink =	jffs2_unlink,
 	.symlink =	jffs2_symlink,
 	.mkdir =	jffs2_mkdir,
 	.rmdir =	jffs2_rmdir,
 	.mknod =	jffs2_mknod,
 	.rename =	jffs2_rename,
 	.setattr =	jffs2_setattr,
 };

 /***********************************************************************/


 /* We keep the dirent list sorted in increasing order of name hash,
    and we use the same hash function as the dentries. Makes this
    nice and simple
 */
 static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target,
 				   struct nameidata *nd)
 {
 	struct jffs2_inode_info *dir_f;
 	struct jffs2_sb_info *c;
 	struct jffs2_full_dirent *fd = NULL, *fd_list;
 	uint32_t ino = 0;
 	struct inode *inode = NULL;

 	D1(printk(KERN_DEBUG "jffs2_lookup()\n"));

 	dir_f = JFFS2_INODE_INFO(dir_i);
 	c = JFFS2_SB_INFO(dir_i->i_sb);

 	down(&dir_f->sem);

 	/* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */
 	for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= target->d_name.hash; fd_list = fd_list->next) {
 		if (fd_list->nhash == target->d_name.hash &&
 		    (!fd || fd_list->version > fd->version) &&
 		    strlen(fd_list->name) == target->d_name.len &&
 		    !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) {
 			fd = fd_list;
 		}
 	}
 	if (fd)
 		ino = fd->ino;
 	up(&dir_f->sem);
 	if (ino) {
 		inode = iget(dir_i->i_sb, ino);
 		if (!inode) {
 			printk(KERN_WARNING "iget() failed for ino #%u\n", ino);
 			return (ERR_PTR(-EIO));
 		}
 	}

 	d_add(target, inode);

 	return NULL;
 }

 /***********************************************************************/


 static int jffs2_readdir(struct file *filp, void *dirent, filldir_t filldir)
 {
 	struct jffs2_inode_info *f;
 	struct jffs2_sb_info *c;
 	struct inode *inode = filp->f_dentry->d_inode;
 	struct jffs2_full_dirent *fd;
 	unsigned long offset, curofs;

 	D1(printk(KERN_DEBUG "jffs2_readdir() for dir_i #%lu\n", filp->f_dentry->d_inode->i_ino));

 	f = JFFS2_INODE_INFO(inode);
 	c = JFFS2_SB_INFO(inode->i_sb);

 	offset = filp->f_pos;

 	if (offset == 0) {
 		D1(printk(KERN_DEBUG "Dirent 0: \".\", ino #%lu\n", inode->i_ino));
 		if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0)
 			goto out;
 		offset++;
 	}
 	if (offset == 1) {
 		unsigned long pino = parent_ino(filp->f_dentry);
 		D1(printk(KERN_DEBUG "Dirent 1: \"..\", ino #%lu\n", pino));
 		if (filldir(dirent, "..", 2, 1, pino, DT_DIR) < 0)
 			goto out;
 		offset++;
 	}

 	curofs=1;
 	down(&f->sem);
 	for (fd = f->dents; fd; fd = fd->next) {

 		curofs++;
 		/* First loop: curofs = 2; offset = 2 */
 		if (curofs < offset) {
 			D2(printk(KERN_DEBUG "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n",
 				  fd->name, fd->ino, fd->type, curofs, offset));
 			continue;
 		}
 		if (!fd->ino) {
 			D2(printk(KERN_DEBUG "Skipping deletion dirent \"%s\"\n", fd->name));
 			offset++;
 			continue;
 		}
 		D2(printk(KERN_DEBUG "Dirent %ld: \"%s\", ino #%u, type %d\n", offset, fd->name, fd->ino, fd->type));
 		if (filldir(dirent, fd->name, strlen(fd->name), offset, fd->ino, fd->type) < 0)
 			break;
 		offset++;
 	}
 	up(&f->sem);
  out:
 	filp->f_pos = offset;
 	return 0;
 }

 /***********************************************************************/


 static int jffs2_create(struct inode *dir_i, struct dentry *dentry, int mode,
 			struct nameidata *nd)
 {
 	struct jffs2_raw_inode *ri;
 	struct jffs2_inode_info *f, *dir_f;
 	struct jffs2_sb_info *c;
 	struct inode *inode;
 	int ret;

 	ri = jffs2_alloc_raw_inode();
 	if (!ri)
 		return -ENOMEM;

 	c = JFFS2_SB_INFO(dir_i->i_sb);

 	D1(printk(KERN_DEBUG "jffs2_create()\n"));

 	inode = jffs2_new_inode(dir_i, mode, ri);

 	if (IS_ERR(inode)) {
 		D1(printk(KERN_DEBUG "jffs2_new_inode() failed\n"));
 		jffs2_free_raw_inode(ri);
 		return PTR_ERR(inode);
 	}

 	inode->i_op = &jffs2_file_inode_operations;
 	inode->i_fop = &jffs2_file_operations;
 	inode->i_mapping->a_ops = &jffs2_file_address_operations;
 	inode->i_mapping->nrpages = 0;

 	f = JFFS2_INODE_INFO(inode);
 	dir_f = JFFS2_INODE_INFO(dir_i);

 	ret = jffs2_do_create(c, dir_f, f, ri,
 			      dentry->d_name.name, dentry->d_name.len);

 	if (ret) {
 		make_bad_inode(inode);
 		iput(inode);
 		jffs2_free_raw_inode(ri);
 		return ret;
 	}

 	dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime));

 	jffs2_free_raw_inode(ri);
 	d_instantiate(dentry, inode);

 	D1(printk(KERN_DEBUG "jffs2_create: Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n",
 		  inode->i_ino, inode->i_mode, inode->i_nlink, f->inocache->nlink, inode->i_mapping->nrpages));
 	return 0;
 }

 /***********************************************************************/


 static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry)
 {
 	struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
 	struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
 	struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode);
 	int ret;

 	ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
 			       dentry->d_name.len, dead_f);
 	if (dead_f->inocache)
 		dentry->d_inode->i_nlink = dead_f->inocache->nlink;
 	return ret;
 }
 /***********************************************************************/


 static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry)
 {
 	struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb);
 	struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
 	struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
 	int ret;
 	uint8_t type;

 	/* Don't let people make hard links to bad inodes. */
 	if (!f->inocache)
 		return -EIO;

 	if (S_ISDIR(old_dentry->d_inode->i_mode))
 		return -EPERM;

 	/* XXX: This is ugly */
 	type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
 	if (!type) type = DT_REG;

 	ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len);

 	if (!ret) {
 		down(&f->sem);
 		old_dentry->d_inode->i_nlink = ++f->inocache->nlink;
 		up(&f->sem);
 		d_instantiate(dentry, old_dentry->d_inode);
 		atomic_inc(&old_dentry->d_inode->i_count);
 	}
 	return ret;
 }

 /***********************************************************************/

 static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target)
 {
 	struct jffs2_inode_info *f, *dir_f;
 	struct jffs2_sb_info *c;
 	struct inode *inode;
 	struct jffs2_raw_inode *ri;
 	struct jffs2_raw_dirent *rd;
 	struct jffs2_full_dnode *fn;
 	struct jffs2_full_dirent *fd;
 	int namelen;
 	uint32_t alloclen, phys_ofs;
 	int ret, targetlen = strlen(target);

 	/* FIXME: If you care. We'd need to use frags for the target
 	   if it grows much more than this */
 	if (targetlen > 254)
 		return -EINVAL;

 	ri = jffs2_alloc_raw_inode();

 	if (!ri)
 		return -ENOMEM;

 	c = JFFS2_SB_INFO(dir_i->i_sb);

 	/* Try to reserve enough space for both node and dirent.
 	 * Just the node will do for now, though
 	 */
 	namelen = dentry->d_name.len;
 	ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &phys_ofs, &alloclen, ALLOC_NORMAL);

 	if (ret) {
 		jffs2_free_raw_inode(ri);
 		return ret;
 	}

 	inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri);

 	if (IS_ERR(inode)) {
 		jffs2_free_raw_inode(ri);
 		jffs2_complete_reservation(c);
 		return PTR_ERR(inode);
 	}

 	inode->i_op = &jffs2_symlink_inode_operations;

 	f = JFFS2_INODE_INFO(inode);

 	inode->i_size = targetlen;
 	ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size);
 	ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size);
 	ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));

 	ri->compr = JFFS2_COMPR_NONE;
 	ri->data_crc = cpu_to_je32(crc32(0, target, targetlen));
 	ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));

 	fn = jffs2_write_dnode(c, f, ri, target, targetlen, phys_ofs, ALLOC_NORMAL);

 	jffs2_free_raw_inode(ri);

 	if (IS_ERR(fn)) {
 		/* Eeek. Wave bye bye */
 		up(&f->sem);
 		jffs2_complete_reservation(c);
 		jffs2_clear_inode(inode);
 		return PTR_ERR(fn);
 	}

 	/* We use f->dents field to store the target path. */
 	f->dents = kmalloc(targetlen + 1, GFP_KERNEL);
 	if (!f->dents) {
 		printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1);
 		up(&f->sem);
 		jffs2_complete_reservation(c);
 		jffs2_clear_inode(inode);
 		return -ENOMEM;
 	}

 	memcpy(f->dents, target, targetlen + 1);
 	D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->dents));

 	/* No data here. Only a metadata node, which will be
 	   obsoleted by the first data write
 	*/
 	f->metadata = fn;
 	up(&f->sem);

 	jffs2_complete_reservation(c);
 	ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL);
 	if (ret) {
 		/* Eep. */
 		jffs2_clear_inode(inode);
 		return ret;
 	}

 	rd = jffs2_alloc_raw_dirent();
 	if (!rd) {
 		/* Argh. Now we treat it like a normal delete */
 		jffs2_complete_reservation(c);
 		jffs2_clear_inode(inode);
 		return -ENOMEM;
 	}

 	dir_f = JFFS2_INODE_INFO(dir_i);
 	down(&dir_f->sem);

 	rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 	rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
 	rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
 	rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));

 	rd->pino = cpu_to_je32(dir_i->i_ino);
 	rd->version = cpu_to_je32(++dir_f->highest_version);
 	rd->ino = cpu_to_je32(inode->i_ino);
 	rd->mctime = cpu_to_je32(get_seconds());
 	rd->nsize = namelen;
 	rd->type = DT_LNK;
 	rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
 	rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));

 	fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, phys_ofs, ALLOC_NORMAL);

 	if (IS_ERR(fd)) {
 		/* dirent failed to write. Delete the inode normally
 		   as if it were the final unlink() */
 		jffs2_complete_reservation(c);
 		jffs2_free_raw_dirent(rd);
 		up(&dir_f->sem);
 		jffs2_clear_inode(inode);
 		return PTR_ERR(fd);
 	}

 	dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));

 	jffs2_free_raw_dirent(rd);

 	/* Link the fd into the inode's list, obsoleting an old
 	   one if necessary. */
 	jffs2_add_fd_to_list(c, fd, &dir_f->dents);

 	up(&dir_f->sem);
 	jffs2_complete_reservation(c);

 	d_instantiate(dentry, inode);
 	return 0;
 }


 static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode)
 {
 	struct jffs2_inode_info *f, *dir_f;
 	struct jffs2_sb_info *c;
 	struct inode *inode;
 	struct jffs2_raw_inode *ri;
 	struct jffs2_raw_dirent *rd;
 	struct jffs2_full_dnode *fn;
 	struct jffs2_full_dirent *fd;
 	int namelen;
 	uint32_t alloclen, phys_ofs;
 	int ret;

 	mode |= S_IFDIR;

 	ri = jffs2_alloc_raw_inode();
 	if (!ri)
 		return -ENOMEM;

 	c = JFFS2_SB_INFO(dir_i->i_sb);

 	/* Try to reserve enough space for both node and dirent.
 	 * Just the node will do for now, though
 	 */
 	namelen = dentry->d_name.len;
 	ret = jffs2_reserve_space(c, sizeof(*ri), &phys_ofs, &alloclen, ALLOC_NORMAL);

 	if (ret) {
 		jffs2_free_raw_inode(ri);
 		return ret;
 	}

 	inode = jffs2_new_inode(dir_i, mode, ri);

 	if (IS_ERR(inode)) {
 		jffs2_free_raw_inode(ri);
 		jffs2_complete_reservation(c);
 		return PTR_ERR(inode);
 	}

 	inode->i_op = &jffs2_dir_inode_operations;
 	inode->i_fop = &jffs2_dir_operations;
 	/* Directories get nlink 2 at start */
 	inode->i_nlink = 2;

 	f = JFFS2_INODE_INFO(inode);

 	ri->data_crc = cpu_to_je32(0);
 	ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));

 	fn = jffs2_write_dnode(c, f, ri, NULL, 0, phys_ofs, ALLOC_NORMAL);

 	jffs2_free_raw_inode(ri);

 	if (IS_ERR(fn)) {
 		/* Eeek. Wave bye bye */
 		up(&f->sem);
 		jffs2_complete_reservation(c);
 		jffs2_clear_inode(inode);
 		return PTR_ERR(fn);
 	}
 	/* No data here. Only a metadata node, which will be
 	   obsoleted by the first data write
 	*/
 	f->metadata = fn;
 	up(&f->sem);

 	jffs2_complete_reservation(c);
 	ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL);
 	if (ret) {
 		/* Eep. */
 		jffs2_clear_inode(inode);
 		return ret;
 	}

 	rd = jffs2_alloc_raw_dirent();
 	if (!rd) {
 		/* Argh. Now we treat it like a normal delete */
 		jffs2_complete_reservation(c);
 		jffs2_clear_inode(inode);
 		return -ENOMEM;
 	}

 	dir_f = JFFS2_INODE_INFO(dir_i);
 	down(&dir_f->sem);

 	rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 	rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
 	rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
 	rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));

 	rd->pino = cpu_to_je32(dir_i->i_ino);
 	rd->version = cpu_to_je32(++dir_f->highest_version);
 	rd->ino = cpu_to_je32(inode->i_ino);
 	rd->mctime = cpu_to_je32(get_seconds());
 	rd->nsize = namelen;
 	rd->type = DT_DIR;
 	rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
 	rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));

 	fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, phys_ofs, ALLOC_NORMAL);

 	if (IS_ERR(fd)) {
 		/* dirent failed to write. Delete the inode normally
 		   as if it were the final unlink() */
 		jffs2_complete_reservation(c);
 		jffs2_free_raw_dirent(rd);
 		up(&dir_f->sem);
 		jffs2_clear_inode(inode);
 		return PTR_ERR(fd);
 	}

 	dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
 	dir_i->i_nlink++;

 	jffs2_free_raw_dirent(rd);

 	/* Link the fd into the inode's list, obsoleting an old
 	   one if necessary. */
 	jffs2_add_fd_to_list(c, fd, &dir_f->dents);

 	up(&dir_f->sem);
 	jffs2_complete_reservation(c);

 	d_instantiate(dentry, inode);
 	return 0;
 }

 static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry)
 {
 	struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode);
 	struct jffs2_full_dirent *fd;
 	int ret;

 	for (fd = f->dents ; fd; fd = fd->next) {
 		if (fd->ino)
 			return -ENOTEMPTY;
 	}
 	ret = jffs2_unlink(dir_i, dentry);
 	if (!ret)
 		dir_i->i_nlink--;
 	return ret;
 }

 static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, dev_t rdev)
 {
 	struct jffs2_inode_info *f, *dir_f;
 	struct jffs2_sb_info *c;
 	struct inode *inode;
 	struct jffs2_raw_inode *ri;
 	struct jffs2_raw_dirent *rd;
 	struct jffs2_full_dnode *fn;
 	struct jffs2_full_dirent *fd;
 	int namelen;
 	jint16_t dev;
 	int devlen = 0;
 	uint32_t alloclen, phys_ofs;
 	int ret;

 	if (!old_valid_dev(rdev))
 		return -EINVAL;

 	ri = jffs2_alloc_raw_inode();
 	if (!ri)
 		return -ENOMEM;

 	c = JFFS2_SB_INFO(dir_i->i_sb);

 	if (S_ISBLK(mode) || S_ISCHR(mode)) {
 		dev = cpu_to_je16(old_encode_dev(rdev));
 		devlen = sizeof(dev);
 	}

 	/* Try to reserve enough space for both node and dirent.
 	 * Just the node will do for now, though
 	 */
 	namelen = dentry->d_name.len;
 	ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &phys_ofs, &alloclen, ALLOC_NORMAL);

 	if (ret) {
 		jffs2_free_raw_inode(ri);
 		return ret;
 	}

 	inode = jffs2_new_inode(dir_i, mode, ri);

 	if (IS_ERR(inode)) {
 		jffs2_free_raw_inode(ri);
 		jffs2_complete_reservation(c);
 		return PTR_ERR(inode);
 	}
 	inode->i_op = &jffs2_file_inode_operations;
 	init_special_inode(inode, inode->i_mode, rdev);

 	f = JFFS2_INODE_INFO(inode);

 	ri->dsize = ri->csize = cpu_to_je32(devlen);
 	ri->totlen = cpu_to_je32(sizeof(*ri) + devlen);
 	ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));

 	ri->compr = JFFS2_COMPR_NONE;
 	ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen));
 	ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));

 	fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, phys_ofs, ALLOC_NORMAL);

 	jffs2_free_raw_inode(ri);

 	if (IS_ERR(fn)) {
 		/* Eeek. Wave bye bye */
 		up(&f->sem);
 		jffs2_complete_reservation(c);
 		jffs2_clear_inode(inode);
 		return PTR_ERR(fn);
 	}
 	/* No data here. Only a metadata node, which will be
 	   obsoleted by the first data write
 	*/
 	f->metadata = fn;
 	up(&f->sem);

 	jffs2_complete_reservation(c);
 	ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL);
 	if (ret) {
 		/* Eep. */
 		jffs2_clear_inode(inode);
 		return ret;
 	}

 	rd = jffs2_alloc_raw_dirent();
 	if (!rd) {
 		/* Argh. Now we treat it like a normal delete */
 		jffs2_complete_reservation(c);
 		jffs2_clear_inode(inode);
 		return -ENOMEM;
 	}

 	dir_f = JFFS2_INODE_INFO(dir_i);
 	down(&dir_f->sem);

 	rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 	rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
 	rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
 	rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));

 	rd->pino = cpu_to_je32(dir_i->i_ino);
 	rd->version = cpu_to_je32(++dir_f->highest_version);
 	rd->ino = cpu_to_je32(inode->i_ino);
 	rd->mctime = cpu_to_je32(get_seconds());
 	rd->nsize = namelen;

 	/* XXX: This is ugly. */
 	rd->type = (mode & S_IFMT) >> 12;

 	rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
 	rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));

 	fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, phys_ofs, ALLOC_NORMAL);

 	if (IS_ERR(fd)) {
 		/* dirent failed to write. Delete the inode normally
 		   as if it were the final unlink() */
 		jffs2_complete_reservation(c);
 		jffs2_free_raw_dirent(rd);
 		up(&dir_f->sem);
 		jffs2_clear_inode(inode);
 		return PTR_ERR(fd);
 	}

 	dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));

 	jffs2_free_raw_dirent(rd);

 	/* Link the fd into the inode's list, obsoleting an old
 	   one if necessary. */
 	jffs2_add_fd_to_list(c, fd, &dir_f->dents);

 	up(&dir_f->sem);
 	jffs2_complete_reservation(c);

 	d_instantiate(dentry, inode);

 	return 0;
 }

 static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
                         struct inode *new_dir_i, struct dentry *new_dentry)
 {
 	int ret;
 	struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb);
 	struct jffs2_inode_info *victim_f = NULL;
 	uint8_t type;

 	/* The VFS will check for us and prevent trying to rename a
 	 * file over a directory and vice versa, but if it's a directory,
 	 * the VFS can't check whether the victim is empty. The filesystem
 	 * needs to do that for itself.
 	 */
 	if (new_dentry->d_inode) {
 		victim_f = JFFS2_INODE_INFO(new_dentry->d_inode);
 		if (S_ISDIR(new_dentry->d_inode->i_mode)) {
 			struct jffs2_full_dirent *fd;

 			down(&victim_f->sem);
 			for (fd = victim_f->dents; fd; fd = fd->next) {
 				if (fd->ino) {
 					up(&victim_f->sem);
 					return -ENOTEMPTY;
 				}
 			}
 			up(&victim_f->sem);
 		}
 	}

 	/* XXX: We probably ought to alloc enough space for
 	   both nodes at the same time. Writing the new link,
 	   then getting -ENOSPC, is quite bad :)
 	*/

 	/* Make a hard link */

 	/* XXX: This is ugly */
 	type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
 	if (!type) type = DT_REG;

 	ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i),
 			    old_dentry->d_inode->i_ino, type,
 			    new_dentry->d_name.name, new_dentry->d_name.len);

 	if (ret)
 		return ret;

 	if (victim_f) {
 		/* There was a victim. Kill it off nicely */
 		new_dentry->d_inode->i_nlink--;
 		/* Don't oops if the victim was a dirent pointing to an
 		   inode which didn't exist. */
 		if (victim_f->inocache) {
 			down(&victim_f->sem);
 			victim_f->inocache->nlink--;
 			up(&victim_f->sem);
 		}
 	}

 	/* If it was a directory we moved, and there was no victim,
 	   increase i_nlink on its new parent */
 	if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f)
 		new_dir_i->i_nlink++;

 	/* Unlink the original */
 	ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
 		      old_dentry->d_name.name, old_dentry->d_name.len, NULL);

 	/* We don't touch inode->i_nlink */

 	if (ret) {
 		/* Oh shit. We really ought to make a single node which can do both atomically */
 		struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
 		down(&f->sem);
 		old_dentry->d_inode->i_nlink++;
 		if (f->inocache)
 			f->inocache->nlink++;
 		up(&f->sem);

 		printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret);
 		/* Might as well let the VFS know */
 		d_instantiate(new_dentry, old_dentry->d_inode);
 		atomic_inc(&old_dentry->d_inode->i_count);
 		return ret;
 	}

 	if (S_ISDIR(old_dentry->d_inode->i_mode))
 		old_dir_i->i_nlink--;

 	return 0;
 }
	/*
	* JFFS2 -- Journalling Flash File System, Version 2.
	*
	* Copyright (C) 2001-2003 Red Hat, Inc.
	*
	* Created by David Woodhouse <dwmw2@infradead.org>
	*
	* For licensing information, see the file 'LICENCE' in this directory.
	*
	* $Id: dir.c,v 1.86 2005/07/06 12:13:09 dwmw2 Exp $
	*
	*/

	#include <linux/kernel.h>
	#include <linux/slab.h>
	#include <linux/sched.h>
	#include <linux/fs.h>
	#include <linux/crc32.h>
	#include <linux/jffs2.h>
	#include <linux/jffs2_fs_i.h>
	#include <linux/jffs2_fs_sb.h>
	#include <linux/time.h>
	#include "nodelist.h"

	static int jffs2_readdir (struct file , void , filldir_t);

	static int jffs2_create (struct inode ,struct dentry ,int,
	struct nameidata *);
	static struct dentry jffs2_lookup (struct inode ,struct dentry *,
	struct nameidata *);
	static int jffs2_link (struct dentry ,struct inode ,struct dentry *);
	static int jffs2_unlink (struct inode ,struct dentry );
	static int jffs2_symlink (struct inode ,struct dentry ,const char *);
	static int jffs2_mkdir (struct inode ,struct dentry ,int);
	static int jffs2_rmdir (struct inode ,struct dentry );
	static int jffs2_mknod (struct inode ,struct dentry ,int,dev_t);
	static int jffs2_rename (struct inode , struct dentry ,
	struct inode , struct dentry );

	struct file_operations jffs2_dir_operations =
	{
	.read = generic_read_dir,
	.readdir = jffs2_readdir,
	.ioctl = jffs2_ioctl,
	.fsync = jffs2_fsync
	};


	struct inode_operations jffs2_dir_inode_operations =
	{
	.create = jffs2_create,
	.lookup = jffs2_lookup,
	.link = jffs2_link,
	.unlink = jffs2_unlink,
	.symlink = jffs2_symlink,
	.mkdir = jffs2_mkdir,
	.rmdir = jffs2_rmdir,
	.mknod = jffs2_mknod,
	.rename = jffs2_rename,
	.setattr = jffs2_setattr,
	};

	/***********************************************************************/


	/* We keep the dirent list sorted in increasing order of name hash,
	and we use the same hash function as the dentries. Makes this
	nice and simple
	*/
	static struct dentry jffs2_lookup(struct inode dir_i, struct dentry *target,
	struct nameidata *nd)
	{
	struct jffs2_inode_info *dir_f;
	struct jffs2_sb_info *c;
	struct jffs2_full_dirent fd = NULL, fd_list;
	uint32_t ino = 0;
	struct inode *inode = NULL;

	D1(printk(KERN_DEBUG "jffs2_lookup()\n"));

	dir_f = JFFS2_INODE_INFO(dir_i);
	c = JFFS2_SB_INFO(dir_i->i_sb);

	down(&dir_f->sem);

	/* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */
	for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= target->d_name.hash; fd_list = fd_list->next) {
	if (fd_list->nhash == target->d_name.hash &&
	(!fd \|\| fd_list->version > fd->version) &&
	strlen(fd_list->name) == target->d_name.len &&
	!strncmp(fd_list->name, target->d_name.name, target->d_name.len)) {
	fd = fd_list;
	}
	}
	if (fd)
	ino = fd->ino;
	up(&dir_f->sem);
	if (ino) {
	inode = iget(dir_i->i_sb, ino);
	if (!inode) {
	printk(KERN_WARNING "iget() failed for ino #%u\n", ino);
	return (ERR_PTR(-EIO));
	}
	}

	d_add(target, inode);

	return NULL;
	}

	/***********************************************************************/


	static int jffs2_readdir(struct file filp, void dirent, filldir_t filldir)
	{
	struct jffs2_inode_info *f;
	struct jffs2_sb_info *c;
	struct inode *inode = filp->f_dentry->d_inode;
	struct jffs2_full_dirent *fd;
	unsigned long offset, curofs;

	D1(printk(KERN_DEBUG "jffs2_readdir() for dir_i #%lu\n", filp->f_dentry->d_inode->i_ino));

	f = JFFS2_INODE_INFO(inode);
	c = JFFS2_SB_INFO(inode->i_sb);

	offset = filp->f_pos;

	if (offset == 0) {
	D1(printk(KERN_DEBUG "Dirent 0: \".\", ino #%lu\n", inode->i_ino));
	if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0)
	goto out;
	offset++;
	}
	if (offset == 1) {
	unsigned long pino = parent_ino(filp->f_dentry);
	D1(printk(KERN_DEBUG "Dirent 1: \"..\", ino #%lu\n", pino));
	if (filldir(dirent, "..", 2, 1, pino, DT_DIR) < 0)
	goto out;
	offset++;
	}

	curofs=1;
	down(&f->sem);
	for (fd = f->dents; fd; fd = fd->next) {

	curofs++;
	/* First loop: curofs = 2; offset = 2 */
	if (curofs < offset) {
	D2(printk(KERN_DEBUG "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n",
	fd->name, fd->ino, fd->type, curofs, offset));
	continue;
	}
	if (!fd->ino) {
	D2(printk(KERN_DEBUG "Skipping deletion dirent \"%s\"\n", fd->name));
	offset++;
	continue;
	}
	D2(printk(KERN_DEBUG "Dirent %ld: \"%s\", ino #%u, type %d\n", offset, fd->name, fd->ino, fd->type));
	if (filldir(dirent, fd->name, strlen(fd->name), offset, fd->ino, fd->type) < 0)
	break;
	offset++;
	}
	up(&f->sem);
	out:
	filp->f_pos = offset;
	return 0;
	}

	/***********************************************************************/


	static int jffs2_create(struct inode dir_i, struct dentry dentry, int mode,
	struct nameidata *nd)
	{
	struct jffs2_raw_inode *ri;
	struct jffs2_inode_info f, dir_f;
	struct jffs2_sb_info *c;
	struct inode *inode;
	int ret;

	ri = jffs2_alloc_raw_inode();
	if (!ri)
	return -ENOMEM;

	c = JFFS2_SB_INFO(dir_i->i_sb);

	D1(printk(KERN_DEBUG "jffs2_create()\n"));

	inode = jffs2_new_inode(dir_i, mode, ri);

	if (IS_ERR(inode)) {
	D1(printk(KERN_DEBUG "jffs2_new_inode() failed\n"));
	jffs2_free_raw_inode(ri);
	return PTR_ERR(inode);
	}

	inode->i_op = &jffs2_file_inode_operations;
	inode->i_fop = &jffs2_file_operations;
	inode->i_mapping->a_ops = &jffs2_file_address_operations;
	inode->i_mapping->nrpages = 0;

	f = JFFS2_INODE_INFO(inode);
	dir_f = JFFS2_INODE_INFO(dir_i);

	ret = jffs2_do_create(c, dir_f, f, ri,
	dentry->d_name.name, dentry->d_name.len);

	if (ret) {
	make_bad_inode(inode);
	iput(inode);
	jffs2_free_raw_inode(ri);
	return ret;
	}

	dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime));

	jffs2_free_raw_inode(ri);
	d_instantiate(dentry, inode);

	D1(printk(KERN_DEBUG "jffs2_create: Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n",
	inode->i_ino, inode->i_mode, inode->i_nlink, f->inocache->nlink, inode->i_mapping->nrpages));
	return 0;
	}

	/***********************************************************************/


	static int jffs2_unlink(struct inode dir_i, struct dentry dentry)
	{
	struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
	struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
	struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode);
	int ret;

	ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
	dentry->d_name.len, dead_f);
	if (dead_f->inocache)
	dentry->d_inode->i_nlink = dead_f->inocache->nlink;
	return ret;
	}
	/***********************************************************************/


	static int jffs2_link (struct dentry old_dentry, struct inode dir_i, struct dentry *dentry)
	{
	struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb);
	struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
	struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
	int ret;
	uint8_t type;

	/* Don't let people make hard links to bad inodes. */
	if (!f->inocache)
	return -EIO;

	if (S_ISDIR(old_dentry->d_inode->i_mode))
	return -EPERM;

	/* XXX: This is ugly */
	type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
	if (!type) type = DT_REG;

	ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len);

	if (!ret) {
	down(&f->sem);
	old_dentry->d_inode->i_nlink = ++f->inocache->nlink;
	up(&f->sem);
	d_instantiate(dentry, old_dentry->d_inode);
	atomic_inc(&old_dentry->d_inode->i_count);
	}
	return ret;
	}

	/***********************************************************************/

	static int jffs2_symlink (struct inode dir_i, struct dentry dentry, const char *target)
	{
	struct jffs2_inode_info f, dir_f;
	struct jffs2_sb_info *c;
	struct inode *inode;
	struct jffs2_raw_inode *ri;
	struct jffs2_raw_dirent *rd;
	struct jffs2_full_dnode *fn;
	struct jffs2_full_dirent *fd;
	int namelen;
	uint32_t alloclen, phys_ofs;
	int ret, targetlen = strlen(target);

	/* FIXME: If you care. We'd need to use frags for the target
	if it grows much more than this */
	if (targetlen > 254)
	return -EINVAL;

	ri = jffs2_alloc_raw_inode();

	if (!ri)
	return -ENOMEM;

	c = JFFS2_SB_INFO(dir_i->i_sb);

	/* Try to reserve enough space for both node and dirent.
	* Just the node will do for now, though
	*/
	namelen = dentry->d_name.len;
	ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &phys_ofs, &alloclen, ALLOC_NORMAL);

	if (ret) {
	jffs2_free_raw_inode(ri);
	return ret;
	}

	inode = jffs2_new_inode(dir_i, S_IFLNK \| S_IRWXUGO, ri);

	if (IS_ERR(inode)) {
	jffs2_free_raw_inode(ri);
	jffs2_complete_reservation(c);
	return PTR_ERR(inode);
	}

	inode->i_op = &jffs2_symlink_inode_operations;

	f = JFFS2_INODE_INFO(inode);

	inode->i_size = targetlen;
	ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size);
	ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size);
	ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));

	ri->compr = JFFS2_COMPR_NONE;
	ri->data_crc = cpu_to_je32(crc32(0, target, targetlen));
	ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));

	fn = jffs2_write_dnode(c, f, ri, target, targetlen, phys_ofs, ALLOC_NORMAL);

	jffs2_free_raw_inode(ri);

	if (IS_ERR(fn)) {
	/* Eeek. Wave bye bye */
	up(&f->sem);
	jffs2_complete_reservation(c);
	jffs2_clear_inode(inode);
	return PTR_ERR(fn);
	}

	/* We use f->dents field to store the target path. */
	f->dents = kmalloc(targetlen + 1, GFP_KERNEL);
	if (!f->dents) {
	printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1);
	up(&f->sem);
	jffs2_complete_reservation(c);
	jffs2_clear_inode(inode);
	return -ENOMEM;
	}

	memcpy(f->dents, target, targetlen + 1);
	D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->dents));

	/* No data here. Only a metadata node, which will be
	obsoleted by the first data write
	*/
	f->metadata = fn;
	up(&f->sem);

	jffs2_complete_reservation(c);
	ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL);
	if (ret) {
	/* Eep. */
	jffs2_clear_inode(inode);
	return ret;
	}

	rd = jffs2_alloc_raw_dirent();
	if (!rd) {
	/* Argh. Now we treat it like a normal delete */
	jffs2_complete_reservation(c);
	jffs2_clear_inode(inode);
	return -ENOMEM;
	}

	dir_f = JFFS2_INODE_INFO(dir_i);
	down(&dir_f->sem);

	rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
	rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
	rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
	rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));

	rd->pino = cpu_to_je32(dir_i->i_ino);
	rd->version = cpu_to_je32(++dir_f->highest_version);
	rd->ino = cpu_to_je32(inode->i_ino);
	rd->mctime = cpu_to_je32(get_seconds());
	rd->nsize = namelen;
	rd->type = DT_LNK;
	rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
	rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));

	fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, phys_ofs, ALLOC_NORMAL);

	if (IS_ERR(fd)) {
	/* dirent failed to write. Delete the inode normally
	as if it were the final unlink() */
	jffs2_complete_reservation(c);
	jffs2_free_raw_dirent(rd);
	up(&dir_f->sem);
	jffs2_clear_inode(inode);
	return PTR_ERR(fd);
	}

	dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));

	jffs2_free_raw_dirent(rd);

	/* Link the fd into the inode's list, obsoleting an old
	one if necessary. */
	jffs2_add_fd_to_list(c, fd, &dir_f->dents);

	up(&dir_f->sem);
	jffs2_complete_reservation(c);

	d_instantiate(dentry, inode);
	return 0;
	}


	static int jffs2_mkdir (struct inode dir_i, struct dentry dentry, int mode)
	{
	struct jffs2_inode_info f, dir_f;
	struct jffs2_sb_info *c;
	struct inode *inode;
	struct jffs2_raw_inode *ri;
	struct jffs2_raw_dirent *rd;
	struct jffs2_full_dnode *fn;
	struct jffs2_full_dirent *fd;
	int namelen;
	uint32_t alloclen, phys_ofs;
	int ret;

	mode \|= S_IFDIR;

	ri = jffs2_alloc_raw_inode();
	if (!ri)
	return -ENOMEM;

	c = JFFS2_SB_INFO(dir_i->i_sb);

	/* Try to reserve enough space for both node and dirent.
	* Just the node will do for now, though
	*/
	namelen = dentry->d_name.len;
	ret = jffs2_reserve_space(c, sizeof(*ri), &phys_ofs, &alloclen, ALLOC_NORMAL);

	if (ret) {
	jffs2_free_raw_inode(ri);
	return ret;
	}

	inode = jffs2_new_inode(dir_i, mode, ri);

	if (IS_ERR(inode)) {
	jffs2_free_raw_inode(ri);
	jffs2_complete_reservation(c);
	return PTR_ERR(inode);
	}

	inode->i_op = &jffs2_dir_inode_operations;
	inode->i_fop = &jffs2_dir_operations;
	/* Directories get nlink 2 at start */
	inode->i_nlink = 2;

	f = JFFS2_INODE_INFO(inode);

	ri->data_crc = cpu_to_je32(0);
	ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));

	fn = jffs2_write_dnode(c, f, ri, NULL, 0, phys_ofs, ALLOC_NORMAL);

	jffs2_free_raw_inode(ri);

	if (IS_ERR(fn)) {
	/* Eeek. Wave bye bye */
	up(&f->sem);
	jffs2_complete_reservation(c);
	jffs2_clear_inode(inode);
	return PTR_ERR(fn);
	}
	/* No data here. Only a metadata node, which will be
	obsoleted by the first data write
	*/
	f->metadata = fn;
	up(&f->sem);

	jffs2_complete_reservation(c);
	ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL);
	if (ret) {
	/* Eep. */
	jffs2_clear_inode(inode);
	return ret;
	}

	rd = jffs2_alloc_raw_dirent();
	if (!rd) {
	/* Argh. Now we treat it like a normal delete */
	jffs2_complete_reservation(c);
	jffs2_clear_inode(inode);
	return -ENOMEM;
	}

	dir_f = JFFS2_INODE_INFO(dir_i);
	down(&dir_f->sem);

	rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
	rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
	rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
	rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));

	rd->pino = cpu_to_je32(dir_i->i_ino);
	rd->version = cpu_to_je32(++dir_f->highest_version);
	rd->ino = cpu_to_je32(inode->i_ino);
	rd->mctime = cpu_to_je32(get_seconds());
	rd->nsize = namelen;
	rd->type = DT_DIR;
	rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
	rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));

	fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, phys_ofs, ALLOC_NORMAL);

	if (IS_ERR(fd)) {
	/* dirent failed to write. Delete the inode normally
	as if it were the final unlink() */
	jffs2_complete_reservation(c);
	jffs2_free_raw_dirent(rd);
	up(&dir_f->sem);
	jffs2_clear_inode(inode);
	return PTR_ERR(fd);
	}

	dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
	dir_i->i_nlink++;

	jffs2_free_raw_dirent(rd);

	/* Link the fd into the inode's list, obsoleting an old
	one if necessary. */
	jffs2_add_fd_to_list(c, fd, &dir_f->dents);

	up(&dir_f->sem);
	jffs2_complete_reservation(c);

	d_instantiate(dentry, inode);
	return 0;
	}

	static int jffs2_rmdir (struct inode dir_i, struct dentry dentry)
	{
	struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode);
	struct jffs2_full_dirent *fd;
	int ret;

	for (fd = f->dents ; fd; fd = fd->next) {
	if (fd->ino)
	return -ENOTEMPTY;
	}
	ret = jffs2_unlink(dir_i, dentry);
	if (!ret)
	dir_i->i_nlink--;
	return ret;
	}

	static int jffs2_mknod (struct inode dir_i, struct dentry dentry, int mode, dev_t rdev)
	{
	struct jffs2_inode_info f, dir_f;
	struct jffs2_sb_info *c;
	struct inode *inode;
	struct jffs2_raw_inode *ri;
	struct jffs2_raw_dirent *rd;
	struct jffs2_full_dnode *fn;
	struct jffs2_full_dirent *fd;
	int namelen;
	jint16_t dev;
	int devlen = 0;
	uint32_t alloclen, phys_ofs;
	int ret;

	if (!old_valid_dev(rdev))
	return -EINVAL;

	ri = jffs2_alloc_raw_inode();
	if (!ri)
	return -ENOMEM;

	c = JFFS2_SB_INFO(dir_i->i_sb);

	if (S_ISBLK(mode) \|\| S_ISCHR(mode)) {
	dev = cpu_to_je16(old_encode_dev(rdev));
	devlen = sizeof(dev);
	}

	/* Try to reserve enough space for both node and dirent.
	* Just the node will do for now, though
	*/
	namelen = dentry->d_name.len;
	ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &phys_ofs, &alloclen, ALLOC_NORMAL);

	if (ret) {
	jffs2_free_raw_inode(ri);
	return ret;
	}

	inode = jffs2_new_inode(dir_i, mode, ri);

	if (IS_ERR(inode)) {
	jffs2_free_raw_inode(ri);
	jffs2_complete_reservation(c);
	return PTR_ERR(inode);
	}
	inode->i_op = &jffs2_file_inode_operations;
	init_special_inode(inode, inode->i_mode, rdev);

	f = JFFS2_INODE_INFO(inode);

	ri->dsize = ri->csize = cpu_to_je32(devlen);
	ri->totlen = cpu_to_je32(sizeof(*ri) + devlen);
	ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));

	ri->compr = JFFS2_COMPR_NONE;
	ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen));
	ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));

	fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, phys_ofs, ALLOC_NORMAL);

	jffs2_free_raw_inode(ri);

	if (IS_ERR(fn)) {
	/* Eeek. Wave bye bye */
	up(&f->sem);
	jffs2_complete_reservation(c);
	jffs2_clear_inode(inode);
	return PTR_ERR(fn);
	}
	/* No data here. Only a metadata node, which will be
	obsoleted by the first data write
	*/
	f->metadata = fn;
	up(&f->sem);

	jffs2_complete_reservation(c);
	ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL);
	if (ret) {
	/* Eep. */
	jffs2_clear_inode(inode);
	return ret;
	}

	rd = jffs2_alloc_raw_dirent();
	if (!rd) {
	/* Argh. Now we treat it like a normal delete */
	jffs2_complete_reservation(c);
	jffs2_clear_inode(inode);
	return -ENOMEM;
	}

	dir_f = JFFS2_INODE_INFO(dir_i);
	down(&dir_f->sem);

	rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
	rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
	rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
	rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));

	rd->pino = cpu_to_je32(dir_i->i_ino);
	rd->version = cpu_to_je32(++dir_f->highest_version);
	rd->ino = cpu_to_je32(inode->i_ino);
	rd->mctime = cpu_to_je32(get_seconds());
	rd->nsize = namelen;

	/* XXX: This is ugly. */
	rd->type = (mode & S_IFMT) >> 12;

	rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
	rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));

	fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, phys_ofs, ALLOC_NORMAL);

	if (IS_ERR(fd)) {
	/* dirent failed to write. Delete the inode normally
	as if it were the final unlink() */
	jffs2_complete_reservation(c);
	jffs2_free_raw_dirent(rd);
	up(&dir_f->sem);
	jffs2_clear_inode(inode);
	return PTR_ERR(fd);
	}

	dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));

	jffs2_free_raw_dirent(rd);

	/* Link the fd into the inode's list, obsoleting an old
	one if necessary. */
	jffs2_add_fd_to_list(c, fd, &dir_f->dents);

	up(&dir_f->sem);
	jffs2_complete_reservation(c);

	d_instantiate(dentry, inode);

	return 0;
	}

	static int jffs2_rename (struct inode old_dir_i, struct dentry old_dentry,
	struct inode new_dir_i, struct dentry new_dentry)
	{
	int ret;
	struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb);
	struct jffs2_inode_info *victim_f = NULL;
	uint8_t type;

	/* The VFS will check for us and prevent trying to rename a
	* file over a directory and vice versa, but if it's a directory,
	* the VFS can't check whether the victim is empty. The filesystem
	* needs to do that for itself.
	*/
	if (new_dentry->d_inode) {
	victim_f = JFFS2_INODE_INFO(new_dentry->d_inode);
	if (S_ISDIR(new_dentry->d_inode->i_mode)) {
	struct jffs2_full_dirent *fd;

	down(&victim_f->sem);
	for (fd = victim_f->dents; fd; fd = fd->next) {
	if (fd->ino) {
	up(&victim_f->sem);
	return -ENOTEMPTY;
	}
	}
	up(&victim_f->sem);
	}
	}

	/* XXX: We probably ought to alloc enough space for
	both nodes at the same time. Writing the new link,
	then getting -ENOSPC, is quite bad :)
	*/

	/* Make a hard link */

	/* XXX: This is ugly */
	type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
	if (!type) type = DT_REG;

	ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i),
	old_dentry->d_inode->i_ino, type,
	new_dentry->d_name.name, new_dentry->d_name.len);

	if (ret)
	return ret;

	if (victim_f) {
	/* There was a victim. Kill it off nicely */
	new_dentry->d_inode->i_nlink--;
	/* Don't oops if the victim was a dirent pointing to an
	inode which didn't exist. */
	if (victim_f->inocache) {
	down(&victim_f->sem);
	victim_f->inocache->nlink--;
	up(&victim_f->sem);
	}
	}

	/* If it was a directory we moved, and there was no victim,
	increase i_nlink on its new parent */
	if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f)
	new_dir_i->i_nlink++;

	/* Unlink the original */
	ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
	old_dentry->d_name.name, old_dentry->d_name.len, NULL);

	/* We don't touch inode->i_nlink */

	if (ret) {
	/* Oh shit. We really ought to make a single node which can do both atomically */
	struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
	down(&f->sem);
	old_dentry->d_inode->i_nlink++;
	if (f->inocache)
	f->inocache->nlink++;
	up(&f->sem);

	printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret);
	/* Might as well let the VFS know */
	d_instantiate(new_dentry, old_dentry->d_inode);
	atomic_inc(&old_dentry->d_inode->i_count);
	return ret;
	}

	if (S_ISDIR(old_dentry->d_inode->i_mode))
	old_dir_i->i_nlink--;

	return 0;
	}