[net-next-2.6.git] / fs / jffs2 / super.c

/*
 * 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: super.c,v 1.104 2004/11/23 15:37:31 gleixner Exp $
 *
 */

#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/fs.h>
#include <linux/mount.h>
#include <linux/jffs2.h>
#include <linux/pagemap.h>
#include <linux/mtd/mtd.h>
#include <linux/ctype.h>
#include <linux/namei.h>
#include "compr.h"
#include "nodelist.h"

static void jffs2_put_super(struct super_block *);

static kmem_cache_t *jffs2_inode_cachep;

static struct inode *jffs2_alloc_inode(struct super_block *sb)
{
	struct jffs2_inode_info *ei;
	ei = (struct jffs2_inode_info *)kmem_cache_alloc(jffs2_inode_cachep, SLAB_KERNEL);
	if (!ei)
		return NULL;
	return &ei->vfs_inode;
}

static void jffs2_destroy_inode(struct inode *inode)
{
	kmem_cache_free(jffs2_inode_cachep, JFFS2_INODE_INFO(inode));
}

static void jffs2_i_init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
{
	struct jffs2_inode_info *ei = (struct jffs2_inode_info *) foo;

	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
	    SLAB_CTOR_CONSTRUCTOR) {
		init_MUTEX_LOCKED(&ei->sem);
		inode_init_once(&ei->vfs_inode);
	}
}

static int jffs2_sync_fs(struct super_block *sb, int wait)
{
	struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);

	down(&c->alloc_sem);
	jffs2_flush_wbuf_pad(c);
	up(&c->alloc_sem);	
	return 0;
}

static struct super_operations jffs2_super_operations =
{
	.alloc_inode =	jffs2_alloc_inode,
	.destroy_inode =jffs2_destroy_inode,
	.read_inode =	jffs2_read_inode,
	.put_super =	jffs2_put_super,
	.write_super =	jffs2_write_super,
	.statfs =	jffs2_statfs,
	.remount_fs =	jffs2_remount_fs,
	.clear_inode =	jffs2_clear_inode,
	.dirty_inode =	jffs2_dirty_inode,
	.sync_fs =	jffs2_sync_fs,
};

static int jffs2_sb_compare(struct super_block *sb, void *data)
{
	struct jffs2_sb_info *p = data;
	struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);

	/* The superblocks are considered to be equivalent if the underlying MTD
	   device is the same one */
	if (c->mtd == p->mtd) {
		D1(printk(KERN_DEBUG "jffs2_sb_compare: match on device %d (\"%s\")\n", p->mtd->index, p->mtd->name));
		return 1;
	} else {
		D1(printk(KERN_DEBUG "jffs2_sb_compare: No match, device %d (\"%s\"), device %d (\"%s\")\n",
			  c->mtd->index, c->mtd->name, p->mtd->index, p->mtd->name));
		return 0;
	}
}

static int jffs2_sb_set(struct super_block *sb, void *data)
{
	struct jffs2_sb_info *p = data;

	/* For persistence of NFS exports etc. we use the same s_dev
	   each time we mount the device, don't just use an anonymous
	   device */
	sb->s_fs_info = p;
	p->os_priv = sb;
	sb->s_dev = MKDEV(MTD_BLOCK_MAJOR, p->mtd->index);

	return 0;
}

static struct super_block *jffs2_get_sb_mtd(struct file_system_type *fs_type,
					      int flags, const char *dev_name, 
					      void *data, struct mtd_info *mtd)
{
	struct super_block *sb;
	struct jffs2_sb_info *c;
	int ret;

	c = kmalloc(sizeof(*c), GFP_KERNEL);
	if (!c)
		return ERR_PTR(-ENOMEM);
	memset(c, 0, sizeof(*c));
	c->mtd = mtd;

	sb = sget(fs_type, jffs2_sb_compare, jffs2_sb_set, c);

	if (IS_ERR(sb))
		goto out_put;

	if (sb->s_root) {
		/* New mountpoint for JFFS2 which is already mounted */
		D1(printk(KERN_DEBUG "jffs2_get_sb_mtd(): Device %d (\"%s\") is already mounted\n",
			  mtd->index, mtd->name));
		goto out_put;
	}

	D1(printk(KERN_DEBUG "jffs2_get_sb_mtd(): New superblock for device %d (\"%s\")\n",
		  mtd->index, mtd->name));

	sb->s_op = &jffs2_super_operations;
	sb->s_flags = flags | MS_NOATIME;

	ret = jffs2_do_fill_super(sb, data, (flags&MS_VERBOSE)?1:0);

	if (ret) {
		/* Failure case... */
		up_write(&sb->s_umount);
		deactivate_super(sb);
		return ERR_PTR(ret);
	}

	sb->s_flags |= MS_ACTIVE;
	return sb;

 out_put:
	kfree(c);
	put_mtd_device(mtd);

	return sb;
}

static struct super_block *jffs2_get_sb_mtdnr(struct file_system_type *fs_type,
					      int flags, const char *dev_name, 
					      void *data, int mtdnr)
{
	struct mtd_info *mtd;

	mtd = get_mtd_device(NULL, mtdnr);
	if (!mtd) {
		D1(printk(KERN_DEBUG "jffs2: MTD device #%u doesn't appear to exist\n", mtdnr));
		return ERR_PTR(-EINVAL);
	}

	return jffs2_get_sb_mtd(fs_type, flags, dev_name, data, mtd);
}

static struct super_block *jffs2_get_sb(struct file_system_type *fs_type,
					int flags, const char *dev_name,
					void *data)
{
	int err;
	struct nameidata nd;
	int mtdnr;

	if (!dev_name)
		return ERR_PTR(-EINVAL);

	D1(printk(KERN_DEBUG "jffs2_get_sb(): dev_name \"%s\"\n", dev_name));

	/* The preferred way of mounting in future; especially when
	   CONFIG_BLK_DEV is implemented - we specify the underlying
	   MTD device by number or by name, so that we don't require 
	   block device support to be present in the kernel. */

	/* FIXME: How to do the root fs this way? */

	if (dev_name[0] == 'm' && dev_name[1] == 't' && dev_name[2] == 'd') {
		/* Probably mounting without the blkdev crap */
		if (dev_name[3] == ':') {
			struct mtd_info *mtd;

			/* Mount by MTD device name */
			D1(printk(KERN_DEBUG "jffs2_get_sb(): mtd:%%s, name \"%s\"\n", dev_name+4));
			for (mtdnr = 0; mtdnr < MAX_MTD_DEVICES; mtdnr++) {
				mtd = get_mtd_device(NULL, mtdnr);
				if (mtd) {
					if (!strcmp(mtd->name, dev_name+4))
						return jffs2_get_sb_mtd(fs_type, flags, dev_name, data, mtd);
					put_mtd_device(mtd);
				}
			}
			printk(KERN_NOTICE "jffs2_get_sb(): MTD device with name \"%s\" not found.\n", dev_name+4);
		} else if (isdigit(dev_name[3])) {
			/* Mount by MTD device number name */
			char *endptr;
			
			mtdnr = simple_strtoul(dev_name+3, &endptr, 0);
			if (!*endptr) {
				/* It was a valid number */
				D1(printk(KERN_DEBUG "jffs2_get_sb(): mtd%%d, mtdnr %d\n", mtdnr));
				return jffs2_get_sb_mtdnr(fs_type, flags, dev_name, data, mtdnr);
			}
		}
	}

	/* Try the old way - the hack where we allowed users to mount 
	   /dev/mtdblock$(n) but didn't actually _use_ the blkdev */

	err = path_lookup(dev_name, LOOKUP_FOLLOW, &nd);

	D1(printk(KERN_DEBUG "jffs2_get_sb(): path_lookup() returned %d, inode %p\n",
		  err, nd.dentry->d_inode));

	if (err)
		return ERR_PTR(err);

	err = -EINVAL;

	if (!S_ISBLK(nd.dentry->d_inode->i_mode))
		goto out;

	if (nd.mnt->mnt_flags & MNT_NODEV) {
		err = -EACCES;
		goto out;
	}

	if (imajor(nd.dentry->d_inode) != MTD_BLOCK_MAJOR) {
		if (!(flags & MS_VERBOSE)) /* Yes I mean this. Strangely */
			printk(KERN_NOTICE "Attempt to mount non-MTD device \"%s\" as JFFS2\n",
			       dev_name);
		goto out;
	}

	mtdnr = iminor(nd.dentry->d_inode);
	path_release(&nd);

	return jffs2_get_sb_mtdnr(fs_type, flags, dev_name, data, mtdnr);

out:
	path_release(&nd);
	return ERR_PTR(err);
}

static void jffs2_put_super (struct super_block *sb)
{
	struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);

	D2(printk(KERN_DEBUG "jffs2: jffs2_put_super()\n"));

	if (!(sb->s_flags & MS_RDONLY))
		jffs2_stop_garbage_collect_thread(c);
	down(&c->alloc_sem);
	jffs2_flush_wbuf_pad(c);
	up(&c->alloc_sem);
	jffs2_free_ino_caches(c);
	jffs2_free_raw_node_refs(c);
	if (c->mtd->flags & MTD_NO_VIRTBLOCKS)
		vfree(c->blocks);
	else
		kfree(c->blocks);
	jffs2_flash_cleanup(c);
	kfree(c->inocache_list);
	if (c->mtd->sync)
		c->mtd->sync(c->mtd);

	D1(printk(KERN_DEBUG "jffs2_put_super returning\n"));
}

static void jffs2_kill_sb(struct super_block *sb)
{
	struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
	generic_shutdown_super(sb);
	put_mtd_device(c->mtd);
	kfree(c);
}

static struct file_system_type jffs2_fs_type = {
	.owner =	THIS_MODULE,
	.name =		"jffs2",
	.get_sb =	jffs2_get_sb,
	.kill_sb =	jffs2_kill_sb,
};

static int __init init_jffs2_fs(void)
{
	int ret;

	printk(KERN_INFO "JFFS2 version 2.2."
#ifdef CONFIG_JFFS2_FS_NAND
	       " (NAND)"
#endif
	       " (C) 2001-2003 Red Hat, Inc.\n");

	jffs2_inode_cachep = kmem_cache_create("jffs2_i",
					     sizeof(struct jffs2_inode_info),
					     0, SLAB_RECLAIM_ACCOUNT,
					     jffs2_i_init_once, NULL);
	if (!jffs2_inode_cachep) {
		printk(KERN_ERR "JFFS2 error: Failed to initialise inode cache\n");
		return -ENOMEM;
	}
	ret = jffs2_compressors_init();
	if (ret) {
		printk(KERN_ERR "JFFS2 error: Failed to initialise compressors\n");
		goto out;
	}
	ret = jffs2_create_slab_caches();
	if (ret) {
		printk(KERN_ERR "JFFS2 error: Failed to initialise slab caches\n");
		goto out_compressors;
	}
	ret = register_filesystem(&jffs2_fs_type);
	if (ret) {
		printk(KERN_ERR "JFFS2 error: Failed to register filesystem\n");
		goto out_slab;
	}
	return 0;

 out_slab:
	jffs2_destroy_slab_caches();
 out_compressors:
	jffs2_compressors_exit();
 out:
	kmem_cache_destroy(jffs2_inode_cachep);
	return ret;
}

static void __exit exit_jffs2_fs(void)
{
	unregister_filesystem(&jffs2_fs_type);
	jffs2_destroy_slab_caches();
	jffs2_compressors_exit();
	kmem_cache_destroy(jffs2_inode_cachep);
}

module_init(init_jffs2_fs);
module_exit(exit_jffs2_fs);

MODULE_DESCRIPTION("The Journalling Flash File System, v2");
MODULE_AUTHOR("Red Hat, Inc.");
MODULE_LICENSE("GPL"); // Actually dual-licensed, but it doesn't matter for 
		       // the sake of this tag. It's Free Software.
Commit	Line	Data
1da177e4 LT	1	/*
	2	* JFFS2 -- Journalling Flash File System, Version 2.
	3	*
	4	* Copyright (C) 2001-2003 Red Hat, Inc.
	5	*
	6	* Created by David Woodhouse <dwmw2@infradead.org>
	7	*
	8	* For licensing information, see the file 'LICENCE' in this directory.
	9	*
	10	* $Id: super.c,v 1.104 2004/11/23 15:37:31 gleixner Exp $
	11	*
	12	*/
	13
	14	#include <linux/config.h>
	15	#include <linux/kernel.h>
	16	#include <linux/module.h>
	17	#include <linux/slab.h>
	18	#include <linux/init.h>
	19	#include <linux/list.h>
	20	#include <linux/fs.h>
	21	#include <linux/mount.h>
	22	#include <linux/jffs2.h>
	23	#include <linux/pagemap.h>
	24	#include <linux/mtd/mtd.h>
	25	#include <linux/ctype.h>
	26	#include <linux/namei.h>
	27	#include "compr.h"
	28	#include "nodelist.h"
	29
	30	static void jffs2_put_super(struct super_block *);
	31
	32	static kmem_cache_t *jffs2_inode_cachep;
	33
	34	static struct inode jffs2_alloc_inode(struct super_block sb)
	35	{
	36	struct jffs2_inode_info *ei;
	37	ei = (struct jffs2_inode_info *)kmem_cache_alloc(jffs2_inode_cachep, SLAB_KERNEL);
	38	if (!ei)
	39	return NULL;
	40	return &ei->vfs_inode;
	41	}
	42
	43	static void jffs2_destroy_inode(struct inode *inode)
	44	{
	45	kmem_cache_free(jffs2_inode_cachep, JFFS2_INODE_INFO(inode));
	46	}
	47
	48	static void jffs2_i_init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
	49	{
	50	struct jffs2_inode_info ei = (struct jffs2_inode_info ) foo;
	51
	52	if ((flags & (SLAB_CTOR_VERIFY\|SLAB_CTOR_CONSTRUCTOR)) ==
	53	SLAB_CTOR_CONSTRUCTOR) {
	54	init_MUTEX_LOCKED(&ei->sem);
	55	inode_init_once(&ei->vfs_inode);
	56	}
	57	}
	58
	59	static int jffs2_sync_fs(struct super_block *sb, int wait)
	60	{
	61	struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
	62
	63	down(&c->alloc_sem);
	64	jffs2_flush_wbuf_pad(c);
65	up(&c->alloc_sem);
66	return 0;
67	}
68
69	static struct super_operations jffs2_super_operations =
70	{
71	.alloc_inode = jffs2_alloc_inode,
72	.destroy_inode =jffs2_destroy_inode,
73	.read_inode = jffs2_read_inode,
74	.put_super = jffs2_put_super,
75	.write_super = jffs2_write_super,
76	.statfs = jffs2_statfs,
77	.remount_fs = jffs2_remount_fs,
78	.clear_inode = jffs2_clear_inode,
79	.dirty_inode = jffs2_dirty_inode,
80	.sync_fs = jffs2_sync_fs,
81	};
82
83	static int jffs2_sb_compare(struct super_block sb, void data)
84	{
85	struct jffs2_sb_info *p = data;
86	struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
87
88	/* The superblocks are considered to be equivalent if the underlying MTD
89	device is the same one */
90	if (c->mtd == p->mtd) {
91	D1(printk(KERN_DEBUG "jffs2_sb_compare: match on device %d (\"%s\")\n", p->mtd->index, p->mtd->name));
92	return 1;
93	} else {
94	D1(printk(KERN_DEBUG "jffs2_sb_compare: No match, device %d (\"%s\"), device %d (\"%s\")\n",
95	c->mtd->index, c->mtd->name, p->mtd->index, p->mtd->name));
96	return 0;
97	}
98	}
99
100	static int jffs2_sb_set(struct super_block sb, void data)
101	{
102	struct jffs2_sb_info *p = data;
103
104	/* For persistence of NFS exports etc. we use the same s_dev
105	each time we mount the device, don't just use an anonymous
106	device */
107	sb->s_fs_info = p;
108	p->os_priv = sb;
109	sb->s_dev = MKDEV(MTD_BLOCK_MAJOR, p->mtd->index);
110
111	return 0;
112	}
113
114	static struct super_block jffs2_get_sb_mtd(struct file_system_type fs_type,
115	int flags, const char *dev_name,
116	void data, struct mtd_info mtd)
117	{
118	struct super_block *sb;
119	struct jffs2_sb_info *c;
120	int ret;
121
122	c = kmalloc(sizeof(*c), GFP_KERNEL);
123	if (!c)
124	return ERR_PTR(-ENOMEM);
125	memset(c, 0, sizeof(*c));
126	c->mtd = mtd;
127
128	sb = sget(fs_type, jffs2_sb_compare, jffs2_sb_set, c);
129
130	if (IS_ERR(sb))
131	goto out_put;
132
133	if (sb->s_root) {
134	/* New mountpoint for JFFS2 which is already mounted */
135	D1(printk(KERN_DEBUG "jffs2_get_sb_mtd(): Device %d (\"%s\") is already mounted\n",
136	mtd->index, mtd->name));
137	goto out_put;
138	}
139
140	D1(printk(KERN_DEBUG "jffs2_get_sb_mtd(): New superblock for device %d (\"%s\")\n",
141	mtd->index, mtd->name));
142
143	sb->s_op = &jffs2_super_operations;
144	sb->s_flags = flags \| MS_NOATIME;
145
146	ret = jffs2_do_fill_super(sb, data, (flags&MS_VERBOSE)?1:0);
147
148	if (ret) {
149	/* Failure case... */
150	up_write(&sb->s_umount);
151	deactivate_super(sb);
152	return ERR_PTR(ret);
153	}
154
155	sb->s_flags \|= MS_ACTIVE;
156	return sb;
157
158	out_put:
159	kfree(c);
160	put_mtd_device(mtd);
161
162	return sb;
163	}
164
165	static struct super_block jffs2_get_sb_mtdnr(struct file_system_type fs_type,
166	int flags, const char *dev_name,
167	void *data, int mtdnr)
168	{
169	struct mtd_info *mtd;
170
171	mtd = get_mtd_device(NULL, mtdnr);
172	if (!mtd) {
173	D1(printk(KERN_DEBUG "jffs2: MTD device #%u doesn't appear to exist\n", mtdnr));
174	return ERR_PTR(-EINVAL);
175	}
176
177	return jffs2_get_sb_mtd(fs_type, flags, dev_name, data, mtd);
178	}
179
180	static struct super_block jffs2_get_sb(struct file_system_type fs_type,
181	int flags, const char *dev_name,
182	void *data)
183	{
184	int err;
185	struct nameidata nd;
186	int mtdnr;
187
188	if (!dev_name)
189	return ERR_PTR(-EINVAL);
190
191	D1(printk(KERN_DEBUG "jffs2_get_sb(): dev_name \"%s\"\n", dev_name));
192
193	/* The preferred way of mounting in future; especially when
194	CONFIG_BLK_DEV is implemented - we specify the underlying
195	MTD device by number or by name, so that we don't require
196	block device support to be present in the kernel. */
197
198	/* FIXME: How to do the root fs this way? */
199
200	if (dev_name[0] == 'm' && dev_name[1] == 't' && dev_name[2] == 'd') {
201	/* Probably mounting without the blkdev crap */
202	if (dev_name[3] == ':') {
203	struct mtd_info *mtd;
204
205	/* Mount by MTD device name */
206	D1(printk(KERN_DEBUG "jffs2_get_sb(): mtd:%%s, name \"%s\"\n", dev_name+4));
207	for (mtdnr = 0; mtdnr < MAX_MTD_DEVICES; mtdnr++) {
208	mtd = get_mtd_device(NULL, mtdnr);
209	if (mtd) {
210	if (!strcmp(mtd->name, dev_name+4))
211	return jffs2_get_sb_mtd(fs_type, flags, dev_name, data, mtd);
212	put_mtd_device(mtd);
213	}
214	}
215	printk(KERN_NOTICE "jffs2_get_sb(): MTD device with name \"%s\" not found.\n", dev_name+4);
216	} else if (isdigit(dev_name[3])) {
217	/* Mount by MTD device number name */
218	char *endptr;
219
220	mtdnr = simple_strtoul(dev_name+3, &endptr, 0);
221	if (!*endptr) {
222	/* It was a valid number */
223	D1(printk(KERN_DEBUG "jffs2_get_sb(): mtd%%d, mtdnr %d\n", mtdnr));
224	return jffs2_get_sb_mtdnr(fs_type, flags, dev_name, data, mtdnr);
225	}
226	}
227	}
228
229	/* Try the old way - the hack where we allowed users to mount
230	/dev/mtdblock$(n) but didn't actually _use_ the blkdev */
231
232	err = path_lookup(dev_name, LOOKUP_FOLLOW, &nd);
233
234	D1(printk(KERN_DEBUG "jffs2_get_sb(): path_lookup() returned %d, inode %p\n",
235	err, nd.dentry->d_inode));
236
237	if (err)
238	return ERR_PTR(err);
239
240	err = -EINVAL;
241
242	if (!S_ISBLK(nd.dentry->d_inode->i_mode))
243	goto out;
244
245	if (nd.mnt->mnt_flags & MNT_NODEV) {
246	err = -EACCES;
247	goto out;
248	}
249
250	if (imajor(nd.dentry->d_inode) != MTD_BLOCK_MAJOR) {
251	if (!(flags & MS_VERBOSE)) /* Yes I mean this. Strangely */
252	printk(KERN_NOTICE "Attempt to mount non-MTD device \"%s\" as JFFS2\n",
253	dev_name);
254	goto out;
255	}
256
257	mtdnr = iminor(nd.dentry->d_inode);
258	path_release(&nd);
259
260	return jffs2_get_sb_mtdnr(fs_type, flags, dev_name, data, mtdnr);
261
262	out:
263	path_release(&nd);
264	return ERR_PTR(err);
265	}
266
267	static void jffs2_put_super (struct super_block *sb)
268	{
269	struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
270
271	D2(printk(KERN_DEBUG "jffs2: jffs2_put_super()\n"));
272
273	if (!(sb->s_flags & MS_RDONLY))
274	jffs2_stop_garbage_collect_thread(c);
275	down(&c->alloc_sem);
276	jffs2_flush_wbuf_pad(c);
277	up(&c->alloc_sem);
278	jffs2_free_ino_caches(c);
279	jffs2_free_raw_node_refs(c);
280	if (c->mtd->flags & MTD_NO_VIRTBLOCKS)
281	vfree(c->blocks);
282	else
283	kfree(c->blocks);
284	jffs2_flash_cleanup(c);
285	kfree(c->inocache_list);
286	if (c->mtd->sync)
287	c->mtd->sync(c->mtd);
288
289	D1(printk(KERN_DEBUG "jffs2_put_super returning\n"));
290	}
291
292	static void jffs2_kill_sb(struct super_block *sb)
293	{
294	struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
295	generic_shutdown_super(sb);
296	put_mtd_device(c->mtd);
297	kfree(c);
298	}
299
300	static struct file_system_type jffs2_fs_type = {
301	.owner = THIS_MODULE,
302	.name = "jffs2",
303	.get_sb = jffs2_get_sb,
304	.kill_sb = jffs2_kill_sb,
305	};
306
307	static int __init init_jffs2_fs(void)
308	{
309	int ret;
310
311	printk(KERN_INFO "JFFS2 version 2.2."
312	#ifdef CONFIG_JFFS2_FS_NAND
313	" (NAND)"
314	#endif
315	" (C) 2001-2003 Red Hat, Inc.\n");
316
317	jffs2_inode_cachep = kmem_cache_create("jffs2_i",
318	sizeof(struct jffs2_inode_info),
319	0, SLAB_RECLAIM_ACCOUNT,
320	jffs2_i_init_once, NULL);
321	if (!jffs2_inode_cachep) {
322	printk(KERN_ERR "JFFS2 error: Failed to initialise inode cache\n");
323	return -ENOMEM;
324	}
325	ret = jffs2_compressors_init();
326	if (ret) {
327	printk(KERN_ERR "JFFS2 error: Failed to initialise compressors\n");
328	goto out;
329	}
330	ret = jffs2_create_slab_caches();
331	if (ret) {
332	printk(KERN_ERR "JFFS2 error: Failed to initialise slab caches\n");
333	goto out_compressors;
334	}
335	ret = register_filesystem(&jffs2_fs_type);
336	if (ret) {
337	printk(KERN_ERR "JFFS2 error: Failed to register filesystem\n");
338	goto out_slab;
339	}
340	return 0;
341
342	out_slab:
343	jffs2_destroy_slab_caches();
344	out_compressors:
345	jffs2_compressors_exit();
346	out:
347	kmem_cache_destroy(jffs2_inode_cachep);
348	return ret;
349	}
350
351	static void __exit exit_jffs2_fs(void)
352	{
353	unregister_filesystem(&jffs2_fs_type);
354	jffs2_destroy_slab_caches();
355	jffs2_compressors_exit();
356	kmem_cache_destroy(jffs2_inode_cachep);
357	}
358
359	module_init(init_jffs2_fs);
360	module_exit(exit_jffs2_fs);
361
362	MODULE_DESCRIPTION("The Journalling Flash File System, v2");
363	MODULE_AUTHOR("Red Hat, Inc.");
364	MODULE_LICENSE("GPL"); // Actually dual-licensed, but it doesn't matter for
365	// the sake of this tag. It's Free Software.