patch-2.4.10 linux/fs/jffs2/dir.c

• Lines: 952
• Date: Fri Sep 14 14:04:07 2001
• Orig file: v2.4.9/linux/fs/jffs2/dir.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.9/linux/fs/jffs2/dir.c linux/fs/jffs2/dir.c
@@ -0,0 +1,951 @@
+/*
+ * JFFS2 -- Journalling Flash File System, Version 2.
+ *
+ * Copyright (C) 2001 Red Hat, Inc.
+ *
+ * Created by David Woodhouse <dwmw2@cambridge.redhat.com>
+ *
+ * The original JFFS, from which the design for JFFS2 was derived,
+ * was designed and implemented by Axis Communications AB.
+ *
+ * The contents of this file are subject to the Red Hat eCos Public
+ * License Version 1.1 (the "Licence"); you may not use this file
+ * except in compliance with the Licence.  You may obtain a copy of
+ * the Licence at http://www.redhat.com/
+ *
+ * Software distributed under the Licence is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.
+ * See the Licence for the specific language governing rights and
+ * limitations under the Licence.
+ *
+ * The Original Code is JFFS2 - Journalling Flash File System, version 2
+ *
+ * Alternatively, the contents of this file may be used under the
+ * terms of the GNU General Public License version 2 (the "GPL"), in
+ * which case the provisions of the GPL are applicable instead of the
+ * above.  If you wish to allow the use of your version of this file
+ * only under the terms of the GPL and not to allow others to use your
+ * version of this file under the RHEPL, indicate your decision by
+ * deleting the provisions above and replace them with the notice and
+ * other provisions required by the GPL.  If you do not delete the
+ * provisions above, a recipient may use your version of this file
+ * under either the RHEPL or the GPL.
+ *
+ * $Id: dir.c,v 1.42 2001/05/24 22:24:39 dwmw2 Exp $
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/fs.h>
+#include <linux/jffs2.h>
+#include <linux/jffs2_fs_i.h>
+#include <linux/jffs2_fs_sb.h>
+#include "nodelist.h"
+#include "crc32.h"
+
+static int jffs2_readdir (struct file *, void *, filldir_t);
+
+static int jffs2_create (struct inode *,struct dentry *,int);
+static struct dentry *jffs2_lookup (struct inode *,struct dentry *);
+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,int);
+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_null_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 jffs2_inode_info *dir_f;
+	struct jffs2_sb_info *c;
+	struct jffs2_full_dirent *fd = NULL, *fd_list;
+	__u32 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) {
+		D1(printk(KERN_DEBUG "Dirent 1: \"..\", ino #%lu\n", filp->f_dentry->d_parent->d_inode->i_ino));
+		if (filldir(dirent, "..", 2, 1, filp->f_dentry->d_parent->d_inode->i_ino, 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)
+			goto out;
+		offset++;
+	}
+ out:
+	up(&f->sem);
+	filp->f_pos = offset;
+	return 0;
+}
+
+/***********************************************************************/
+
+static int jffs2_create(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;
+	__u32 alloclen, phys_ofs;
+	__u32 writtenlen;
+	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"));
+
+	/* 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);
+	D1(printk(KERN_DEBUG "jffs2_create(): reserved 0x%x bytes\n", alloclen));
+	if (ret) {
+		jffs2_free_raw_inode(ri);
+		return ret;
+	}
+
+	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);
+		jffs2_complete_reservation(c);
+		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);
+
+	ri->data_crc = 0;
+	ri->node_crc = crc32(0, ri, sizeof(*ri)-8);
+
+	fn = jffs2_write_dnode(inode, ri, NULL, 0, phys_ofs, &writtenlen);
+	D1(printk(KERN_DEBUG "jffs2_create created file with mode 0x%x\n", ri->mode));
+	jffs2_free_raw_inode(ri);
+
+	if (IS_ERR(fn)) {
+		D1(printk(KERN_DEBUG "jffs2_write_dnode() failed\n"));
+		/* 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;
+
+	/* Work out where to put the dirent node now. */
+	writtenlen = PAD(writtenlen);
+	phys_ofs += writtenlen;
+	alloclen -= writtenlen;
+	up(&f->sem);
+
+	if (alloclen < sizeof(*rd)+namelen) {
+		/* Not enough space left in this chunk. Get some more */
+		jffs2_complete_reservation(c);
+		ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL);
+		
+		if (ret) {
+			/* Eep. */
+			D1(printk(KERN_DEBUG "jffs2_reserve_space() for dirent failed\n"));
+			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 = JFFS2_MAGIC_BITMASK;
+	rd->nodetype = JFFS2_NODETYPE_DIRENT;
+	rd->totlen = sizeof(*rd) + namelen;
+	rd->hdr_crc = crc32(0, rd, sizeof(struct jffs2_unknown_node)-4);
+
+	rd->pino = dir_i->i_ino;
+	rd->version = dir_f->highest_version++;
+	rd->ino = inode->i_ino;
+	rd->mctime = CURRENT_TIME;
+	rd->nsize = namelen;
+	rd->type = DT_REG;
+	rd->node_crc = crc32(0, rd, sizeof(*rd)-8);
+	rd->name_crc = crc32(0, dentry->d_name.name, namelen);
+
+	fd = jffs2_write_dirent(dir_i, rd, dentry->d_name.name, namelen, phys_ofs, &writtenlen);
+
+	jffs2_complete_reservation(c);
+	jffs2_free_raw_dirent(rd);
+	
+	if (IS_ERR(fd)) {
+		/* dirent failed to write. Delete the inode normally 
+		   as if it were the final unlink() */
+		up(&dir_f->sem);
+		jffs2_clear_inode(inode);
+		return PTR_ERR(fd);
+	}
+
+	/* 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);
+
+	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_do_unlink(struct inode *dir_i, struct dentry *dentry, int rename)
+{
+	struct jffs2_inode_info *dir_f, *f;
+	struct jffs2_sb_info *c;
+	struct jffs2_raw_dirent *rd;
+	struct jffs2_full_dirent *fd;
+	__u32 alloclen, phys_ofs;
+	int ret;
+
+	c = JFFS2_SB_INFO(dir_i->i_sb);
+
+	rd = jffs2_alloc_raw_dirent();
+	if (!rd)
+		return -ENOMEM;
+
+	ret = jffs2_reserve_space(c, sizeof(*rd)+dentry->d_name.len, &phys_ofs, &alloclen, ALLOC_DELETION);
+	if (ret) {
+		jffs2_free_raw_dirent(rd);
+		return ret;
+	}
+
+	dir_f = JFFS2_INODE_INFO(dir_i);
+	down(&dir_f->sem);
+
+	/* Build a deletion node */
+	rd->magic = JFFS2_MAGIC_BITMASK;
+	rd->nodetype = JFFS2_NODETYPE_DIRENT;
+	rd->totlen = sizeof(*rd) + dentry->d_name.len;
+	rd->hdr_crc = crc32(0, rd, sizeof(struct jffs2_unknown_node)-4);
+
+	rd->pino = dir_i->i_ino;
+	rd->version = dir_f->highest_version++;
+	rd->ino = 0;
+	rd->mctime = CURRENT_TIME;
+	rd->nsize = dentry->d_name.len;
+	rd->type = DT_UNKNOWN;
+	rd->node_crc = crc32(0, rd, sizeof(*rd)-8);
+	rd->name_crc = crc32(0, dentry->d_name.name, dentry->d_name.len);
+
+	fd = jffs2_write_dirent(dir_i, rd, dentry->d_name.name, dentry->d_name.len, phys_ofs, NULL);
+	
+	jffs2_complete_reservation(c);
+	jffs2_free_raw_dirent(rd);
+
+	if (IS_ERR(fd)) {
+		up(&dir_f->sem);
+		return PTR_ERR(fd);
+	}
+
+	/* File it. This will mark the old one obsolete. */
+	jffs2_add_fd_to_list(c, fd, &dir_f->dents);
+	up(&dir_f->sem);
+	
+	if (!rename) {
+		f = JFFS2_INODE_INFO(dentry->d_inode);
+		down(&f->sem);
+
+		while (f->dents) {
+			/* There can be only deleted ones */
+			fd = f->dents;
+			
+			f->dents = fd->next;
+			
+			if (fd->ino) {
+				printk(KERN_WARNING "Deleting inode #%u with active dentry \"%s\"->ino #%u\n",
+				       f->inocache->ino, fd->name, fd->ino);
+			} else {
+				D1(printk(KERN_DEBUG "Removing deletion dirent for \"%s\" from dir ino #%u\n", fd->name, f->inocache->ino));
+			}
+			jffs2_mark_node_obsolete(c, fd->raw);
+			jffs2_free_full_dirent(fd);
+		}
+
+		f->inocache->nlink--;
+		dentry->d_inode->i_nlink--;
+		up(&f->sem);
+	}
+
+	return 0;
+}
+
+static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry)
+{
+	return jffs2_do_unlink(dir_i, dentry, 0);
+}
+/***********************************************************************/
+
+static int jffs2_do_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry, int rename)
+{
+	struct jffs2_inode_info *dir_f, *f;
+	struct jffs2_sb_info *c;
+	struct jffs2_raw_dirent *rd;
+	struct jffs2_full_dirent *fd;
+	__u32 alloclen, phys_ofs;
+	int ret;
+
+	c = JFFS2_SB_INFO(dir_i->i_sb);
+
+	rd = jffs2_alloc_raw_dirent();
+	if (!rd)
+		return -ENOMEM;
+
+	ret = jffs2_reserve_space(c, sizeof(*rd)+dentry->d_name.len, &phys_ofs, &alloclen, ALLOC_NORMAL);
+	if (ret) {
+		jffs2_free_raw_dirent(rd);
+		return ret;
+	}
+	
+	dir_f = JFFS2_INODE_INFO(dir_i);
+	down(&dir_f->sem);
+
+	/* Build a deletion node */
+	rd->magic = JFFS2_MAGIC_BITMASK;
+	rd->nodetype = JFFS2_NODETYPE_DIRENT;
+	rd->totlen = sizeof(*rd) + dentry->d_name.len;
+	rd->hdr_crc = crc32(0, rd, sizeof(struct jffs2_unknown_node)-4);
+
+	rd->pino = dir_i->i_ino;
+	rd->version = dir_f->highest_version++;
+	rd->ino = old_dentry->d_inode->i_ino;
+	rd->mctime = CURRENT_TIME;
+	rd->nsize = dentry->d_name.len;
+
+	/* XXX: This is ugly. */
+	rd->type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
+	if (!rd->type) rd->type = DT_REG;
+
+	rd->node_crc = crc32(0, rd, sizeof(*rd)-8);
+	rd->name_crc = crc32(0, dentry->d_name.name, dentry->d_name.len);
+
+	fd = jffs2_write_dirent(dir_i, rd, dentry->d_name.name, dentry->d_name.len, phys_ofs, NULL);
+	
+	jffs2_complete_reservation(c);
+	jffs2_free_raw_dirent(rd);
+
+	if (IS_ERR(fd)) {
+		up(&dir_f->sem);
+		return PTR_ERR(fd);
+	}
+
+	/* File it. This will mark the old one obsolete. */
+	jffs2_add_fd_to_list(c, fd, &dir_f->dents);
+	up(&dir_f->sem);
+
+	if (!rename) {
+		f = JFFS2_INODE_INFO(old_dentry->d_inode);
+		down(&f->sem);
+		old_dentry->d_inode->i_nlink = ++f->inocache->nlink;
+		up(&f->sem);
+	}
+	return 0;
+}
+
+static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry)
+{
+	int ret = jffs2_do_link(old_dentry, dir_i, dentry, 0);
+	if (!ret) {
+		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;
+	__u32 alloclen, phys_ofs;
+	__u32 writtenlen;
+	int ret;
+
+	/* FIXME: If you care. We'd need to use frags for the target
+	   if it grows much more than this */
+	if (strlen(target) > 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) + strlen(target), &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);
+
+	ri->dsize = ri->csize = strlen(target);
+	ri->totlen = sizeof(*ri) + ri->dsize;
+	ri->hdr_crc = crc32(0, ri, sizeof(struct jffs2_unknown_node)-4);
+
+	ri->compr = JFFS2_COMPR_NONE;
+	ri->data_crc = crc32(0, target, strlen(target));
+	ri->node_crc = crc32(0, ri, sizeof(*ri)-8);
+	
+	fn = jffs2_write_dnode(inode, ri, target, strlen(target), phys_ofs, &writtenlen);
+
+	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);
+
+	/* Work out where to put the dirent node now. */
+	writtenlen = (writtenlen+3)&~3;
+	phys_ofs += writtenlen;
+	alloclen -= writtenlen;
+
+	if (alloclen < sizeof(*rd)+namelen) {
+		/* Not enough space left in this chunk. Get some more */
+		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 = JFFS2_MAGIC_BITMASK;
+	rd->nodetype = JFFS2_NODETYPE_DIRENT;
+	rd->totlen = sizeof(*rd) + namelen;
+	rd->hdr_crc = crc32(0, rd, sizeof(struct jffs2_unknown_node)-4);
+
+	rd->pino = dir_i->i_ino;
+	rd->version = dir_f->highest_version++;
+	rd->ino = inode->i_ino;
+	rd->mctime = CURRENT_TIME;
+	rd->nsize = namelen;
+	rd->type = DT_LNK;
+	rd->node_crc = crc32(0, rd, sizeof(*rd)-8);
+	rd->name_crc = crc32(0, dentry->d_name.name, namelen);
+
+	fd = jffs2_write_dirent(dir_i, rd, dentry->d_name.name, namelen, phys_ofs, &writtenlen);
+	
+	jffs2_complete_reservation(c);
+	jffs2_free_raw_dirent(rd);
+	
+	if (IS_ERR(fd)) {
+		/* dirent failed to write. Delete the inode normally 
+		   as if it were the final unlink() */
+		up(&dir_f->sem);
+		jffs2_clear_inode(inode);
+		return PTR_ERR(fd);
+	}
+
+	/* 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);
+
+	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;
+	__u32 alloclen, phys_ofs;
+	__u32 writtenlen;
+	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;
+
+	f = JFFS2_INODE_INFO(inode);
+
+	ri->data_crc = 0;
+	ri->node_crc = crc32(0, ri, sizeof(*ri)-8);
+	
+	fn = jffs2_write_dnode(inode, ri, NULL, 0, phys_ofs, &writtenlen);
+
+	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);
+
+	/* Work out where to put the dirent node now. */
+	writtenlen = PAD(writtenlen);
+	phys_ofs += writtenlen;
+	alloclen -= writtenlen;
+
+	if (alloclen < sizeof(*rd)+namelen) {
+		/* Not enough space left in this chunk. Get some more */
+		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 = JFFS2_MAGIC_BITMASK;
+	rd->nodetype = JFFS2_NODETYPE_DIRENT;
+	rd->totlen = sizeof(*rd) + namelen;
+	rd->hdr_crc = crc32(0, rd, sizeof(struct jffs2_unknown_node)-4);
+
+	rd->pino = dir_i->i_ino;
+	rd->version = dir_f->highest_version++;
+	rd->ino = inode->i_ino;
+	rd->mctime = CURRENT_TIME;
+	rd->nsize = namelen;
+	rd->type = DT_DIR;
+	rd->node_crc = crc32(0, rd, sizeof(*rd)-8);
+	rd->name_crc = crc32(0, dentry->d_name.name, namelen);
+
+	fd = jffs2_write_dirent(dir_i, rd, dentry->d_name.name, namelen, phys_ofs, &writtenlen);
+	
+	jffs2_complete_reservation(c);
+	jffs2_free_raw_dirent(rd);
+	
+	if (IS_ERR(fd)) {
+		/* dirent failed to write. Delete the inode normally 
+		   as if it were the final unlink() */
+		up(&dir_f->sem);
+		jffs2_clear_inode(inode);
+		return PTR_ERR(fd);
+	}
+
+	/* 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);
+
+	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;
+
+	for (fd = f->dents ; fd; fd = fd->next) {
+		if (fd->ino)
+			return -ENOTEMPTY;
+	}
+	return jffs2_unlink(dir_i, dentry);
+}
+
+static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, int 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;
+	unsigned short dev;
+	int devlen = 0;
+	__u32 alloclen, phys_ofs;
+	__u32 writtenlen;
+	int ret;
+
+	ri = jffs2_alloc_raw_inode();
+	if (!ri)
+		return -ENOMEM;
+	
+	c = JFFS2_SB_INFO(dir_i->i_sb);
+	
+	if ((mode & S_IFMT) == S_IFBLK ||
+	    (mode & S_IFMT) == S_IFCHR) {
+		dev = (MAJOR(to_kdev_t(rdev)) << 8) | MINOR(to_kdev_t(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 = devlen;
+	ri->totlen = sizeof(*ri) + ri->csize;
+	ri->hdr_crc = crc32(0, ri, sizeof(struct jffs2_unknown_node)-4);
+
+	ri->compr = JFFS2_COMPR_NONE;
+	ri->data_crc = crc32(0, &dev, devlen);
+	ri->node_crc = crc32(0, ri, sizeof(*ri)-8);
+	
+	fn = jffs2_write_dnode(inode, ri, (char *)&dev, devlen, phys_ofs, &writtenlen);
+
+	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);
+
+	/* Work out where to put the dirent node now. */
+	writtenlen = (writtenlen+3)&~3;
+	phys_ofs += writtenlen;
+	alloclen -= writtenlen;
+
+	if (alloclen < sizeof(*rd)+namelen) {
+		/* Not enough space left in this chunk. Get some more */
+		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 = JFFS2_MAGIC_BITMASK;
+	rd->nodetype = JFFS2_NODETYPE_DIRENT;
+	rd->totlen = sizeof(*rd) + namelen;
+	rd->hdr_crc = crc32(0, rd, sizeof(struct jffs2_unknown_node)-4);
+
+	rd->pino = dir_i->i_ino;
+	rd->version = dir_f->highest_version++;
+	rd->ino = inode->i_ino;
+	rd->mctime = CURRENT_TIME;
+	rd->nsize = namelen;
+
+	/* XXX: This is ugly. */
+	rd->type = (mode & S_IFMT) >> 12;
+
+	rd->node_crc = crc32(0, rd, sizeof(*rd)-8);
+	rd->name_crc = crc32(0, dentry->d_name.name, namelen);
+
+	fd = jffs2_write_dirent(dir_i, rd, dentry->d_name.name, namelen, phys_ofs, &writtenlen);
+	
+	jffs2_complete_reservation(c);
+	jffs2_free_raw_dirent(rd);
+	
+	if (IS_ERR(fd)) {
+		/* dirent failed to write. Delete the inode normally 
+		   as if it were the final unlink() */
+		up(&dir_f->sem);
+		jffs2_clear_inode(inode);
+		return PTR_ERR(fd);
+	}
+
+	/* 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);
+
+	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;
+	/* 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 */
+	ret = jffs2_do_link(old_dentry, new_dir_i, new_dentry, 1);
+	if (ret)
+		return ret;
+
+	/* Unlink the original */
+	ret = jffs2_do_unlink(old_dir_i, old_dentry, 1);
+	
+	if (ret) {
+		/* Try to delete the _new_ link to return a clean failure */
+		int ret2 = jffs2_do_unlink(new_dir_i, new_dentry, 1);
+		if (ret2) {
+			struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
+			down(&f->sem);
+			old_dentry->d_inode->i_nlink = f->inocache->nlink++;
+			up(&f->sem);
+		       
+			printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (old err %d, new err %d). You now have a hard link\n", ret, ret2);
+			/* 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;
+}
+