[deliverable/linux.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 1.110 2005/11/07 11:14:42 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(&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));

	/* Initialize JFFS2 superblock locks, the further initialization will be
	 * done later */
	init_MUTEX(&c->alloc_sem);
	init_MUTEX(&c->erase_free_sem);
	init_waitqueue_head(&c->erase_wait);
	init_waitqueue_head(&c->inocache_wq);
	spin_lock_init(&c->erase_completion_lock);
	spin_lock_init(&c->inocache_lock);

	sb->s_op = &jffs2_super_operations;
	sb->s_flags = flags | MS_NOATIME;
	sb->s_xattr = jffs2_xattr_handlers;
#ifdef CONFIG_JFFS2_FS_POSIX_ACL
	sb->s_flags |= MS_POSIXACL;
#endif
	ret = jffs2_do_fill_super(sb, data, flags & MS_SILENT ? 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_SILENT))
			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"));

	down(&c->alloc_sem);
	jffs2_flush_wbuf_pad(c);
	up(&c->alloc_sem);

	jffs2_sum_exit(c);

	jffs2_free_ino_caches(c);
	jffs2_free_raw_node_refs(c);
	if (jffs2_blocks_use_vmalloc(c))
		vfree(c->blocks);
	else
		kfree(c->blocks);
	jffs2_flash_cleanup(c);
	kfree(c->inocache_list);
	jffs2_clear_xattr_subsystem(c);
	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);
	if (!(sb->s_flags & MS_RDONLY))
		jffs2_stop_garbage_collect_thread(c);
	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_WRITEBUFFER
	       " (NAND)"
#endif
#ifdef CONFIG_JFFS2_SUMMARY
	       " (SUMMARY) "
#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|
						SLAB_MEM_SPREAD),
					     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	*
182ec4ee	10	* $Id: super.c,v 1.110 2005/11/07 11:14:42 gleixner Exp $
1da177e4 LT	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) {
21eeb7aa	54	init_MUTEX(&ei->sem);
1da177e4 LT	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);
182ec4ee	65	up(&c->alloc_sem);
1da177e4 LT	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,
182ec4ee	115	int flags, const char *dev_name,
1da177e4 LT	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
b6220598 AB	143	/* Initialize JFFS2 superblock locks, the further initialization will be
	144	* done later */
	145	init_MUTEX(&c->alloc_sem);
	146	init_MUTEX(&c->erase_free_sem);
	147	init_waitqueue_head(&c->erase_wait);
	148	init_waitqueue_head(&c->inocache_wq);
	149	spin_lock_init(&c->erase_completion_lock);
	150	spin_lock_init(&c->inocache_lock);
	151
1da177e4 LT	152	sb->s_op = &jffs2_super_operations;
1da177e4 LT	153	sb->s_flags = flags \| MS_NOATIME;
aa98d7cf KK	154	sb->s_xattr = jffs2_xattr_handlers;
	155	#ifdef CONFIG_JFFS2_FS_POSIX_ACL
	156	sb->s_flags \|= MS_POSIXACL;
	157	#endif
9b04c997	158	ret = jffs2_do_fill_super(sb, data, flags & MS_SILENT ? 1 : 0);
1da177e4 LT	159
	160	if (ret) {
	161	/* Failure case... */
	162	up_write(&sb->s_umount);
	163	deactivate_super(sb);
	164	return ERR_PTR(ret);
	165	}
	166
	167	sb->s_flags \|= MS_ACTIVE;
	168	return sb;
	169
	170	out_put:
	171	kfree(c);
	172	put_mtd_device(mtd);
	173
	174	return sb;
	175	}
	176
	177	static struct super_block jffs2_get_sb_mtdnr(struct file_system_type fs_type,
182ec4ee	178	int flags, const char *dev_name,
1da177e4 LT	179	void *data, int mtdnr)
	180	{
	181	struct mtd_info *mtd;
	182
	183	mtd = get_mtd_device(NULL, mtdnr);
	184	if (!mtd) {
	185	D1(printk(KERN_DEBUG "jffs2: MTD device #%u doesn't appear to exist\n", mtdnr));
	186	return ERR_PTR(-EINVAL);
	187	}
	188
	189	return jffs2_get_sb_mtd(fs_type, flags, dev_name, data, mtd);
	190	}
	191
	192	static struct super_block jffs2_get_sb(struct file_system_type fs_type,
	193	int flags, const char *dev_name,
	194	void *data)
	195	{
	196	int err;
	197	struct nameidata nd;
	198	int mtdnr;
	199
	200	if (!dev_name)
	201	return ERR_PTR(-EINVAL);
	202
	203	D1(printk(KERN_DEBUG "jffs2_get_sb(): dev_name \"%s\"\n", dev_name));
	204
	205	/* The preferred way of mounting in future; especially when
	206	CONFIG_BLK_DEV is implemented - we specify the underlying
182ec4ee	207	MTD device by number or by name, so that we don't require
1da177e4 LT	208	block device support to be present in the kernel. */
	209
	210	/* FIXME: How to do the root fs this way? */
	211
	212	if (dev_name[0] == 'm' && dev_name[1] == 't' && dev_name[2] == 'd') {
	213	/* Probably mounting without the blkdev crap */
	214	if (dev_name[3] == ':') {
	215	struct mtd_info *mtd;
	216
	217	/* Mount by MTD device name */
	218	D1(printk(KERN_DEBUG "jffs2_get_sb(): mtd:%%s, name \"%s\"\n", dev_name+4));
	219	for (mtdnr = 0; mtdnr < MAX_MTD_DEVICES; mtdnr++) {
	220	mtd = get_mtd_device(NULL, mtdnr);
	221	if (mtd) {
	222	if (!strcmp(mtd->name, dev_name+4))
	223	return jffs2_get_sb_mtd(fs_type, flags, dev_name, data, mtd);
	224	put_mtd_device(mtd);
	225	}
	226	}
	227	printk(KERN_NOTICE "jffs2_get_sb(): MTD device with name \"%s\" not found.\n", dev_name+4);
	228	} else if (isdigit(dev_name[3])) {
	229	/* Mount by MTD device number name */
	230	char *endptr;
182ec4ee	231
1da177e4 LT	232	mtdnr = simple_strtoul(dev_name+3, &endptr, 0);
	233	if (!*endptr) {
	234	/* It was a valid number */
	235	D1(printk(KERN_DEBUG "jffs2_get_sb(): mtd%%d, mtdnr %d\n", mtdnr));
	236	return jffs2_get_sb_mtdnr(fs_type, flags, dev_name, data, mtdnr);
	237	}
	238	}
	239	}
	240
182ec4ee	241	/* Try the old way - the hack where we allowed users to mount
1da177e4 LT	242	/dev/mtdblock$(n) but didn't actually _use_ the blkdev */
	243
	244	err = path_lookup(dev_name, LOOKUP_FOLLOW, &nd);
	245
	246	D1(printk(KERN_DEBUG "jffs2_get_sb(): path_lookup() returned %d, inode %p\n",
	247	err, nd.dentry->d_inode));
	248
	249	if (err)
	250	return ERR_PTR(err);
	251
	252	err = -EINVAL;
	253
	254	if (!S_ISBLK(nd.dentry->d_inode->i_mode))
	255	goto out;
	256
	257	if (nd.mnt->mnt_flags & MNT_NODEV) {
	258	err = -EACCES;
	259	goto out;
	260	}
	261
	262	if (imajor(nd.dentry->d_inode) != MTD_BLOCK_MAJOR) {
9b04c997	263	if (!(flags & MS_SILENT))
1da177e4 LT	264	printk(KERN_NOTICE "Attempt to mount non-MTD device \"%s\" as JFFS2\n",
	265	dev_name);
	266	goto out;
	267	}
	268
	269	mtdnr = iminor(nd.dentry->d_inode);
	270	path_release(&nd);
	271
	272	return jffs2_get_sb_mtdnr(fs_type, flags, dev_name, data, mtdnr);
	273
	274	out:
	275	path_release(&nd);
	276	return ERR_PTR(err);
	277	}
	278
	279	static void jffs2_put_super (struct super_block *sb)
	280	{
	281	struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
	282
	283	D2(printk(KERN_DEBUG "jffs2: jffs2_put_super()\n"));
	284
1da177e4 LT	285	down(&c->alloc_sem);
	286	jffs2_flush_wbuf_pad(c);
	287	up(&c->alloc_sem);
e631ddba FH	288
	289	jffs2_sum_exit(c);
	290
1da177e4 LT	291	jffs2_free_ino_caches(c);
1da177e4 LT	292	jffs2_free_raw_node_refs(c);
4ce1f562	293	if (jffs2_blocks_use_vmalloc(c))
1da177e4 LT	294	vfree(c->blocks);
	295	else
	296	kfree(c->blocks);
	297	jffs2_flash_cleanup(c);
	298	kfree(c->inocache_list);
aa98d7cf	299	jffs2_clear_xattr_subsystem(c);
1da177e4 LT	300	if (c->mtd->sync)
	301	c->mtd->sync(c->mtd);
	302
	303	D1(printk(KERN_DEBUG "jffs2_put_super returning\n"));
	304	}
	305
	306	static void jffs2_kill_sb(struct super_block *sb)
	307	{
	308	struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
a69dde91 AB	309	if (!(sb->s_flags & MS_RDONLY))
a69dde91 AB	310	jffs2_stop_garbage_collect_thread(c);
1da177e4 LT	311	generic_shutdown_super(sb);
	312	put_mtd_device(c->mtd);
	313	kfree(c);
	314	}
	315
	316	static struct file_system_type jffs2_fs_type = {
	317	.owner = THIS_MODULE,
	318	.name = "jffs2",
	319	.get_sb = jffs2_get_sb,
	320	.kill_sb = jffs2_kill_sb,
	321	};
	322
	323	static int __init init_jffs2_fs(void)
	324	{
	325	int ret;
	326
	327	printk(KERN_INFO "JFFS2 version 2.2."
2f82ce1e	328	#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
1da177e4	329	" (NAND)"
e631ddba FH	330	#endif
	331	#ifdef CONFIG_JFFS2_SUMMARY
	332	" (SUMMARY) "
1da177e4 LT	333	#endif
	334	" (C) 2001-2003 Red Hat, Inc.\n");
	335
	336	jffs2_inode_cachep = kmem_cache_create("jffs2_i",
	337	sizeof(struct jffs2_inode_info),
fffb60f9 PJ	338	0, (SLAB_RECLAIM_ACCOUNT\|
fffb60f9 PJ	339	SLAB_MEM_SPREAD),
1da177e4 LT	340	jffs2_i_init_once, NULL);
	341	if (!jffs2_inode_cachep) {
	342	printk(KERN_ERR "JFFS2 error: Failed to initialise inode cache\n");
	343	return -ENOMEM;
	344	}
	345	ret = jffs2_compressors_init();
	346	if (ret) {
	347	printk(KERN_ERR "JFFS2 error: Failed to initialise compressors\n");
	348	goto out;
	349	}
	350	ret = jffs2_create_slab_caches();
	351	if (ret) {
	352	printk(KERN_ERR "JFFS2 error: Failed to initialise slab caches\n");
	353	goto out_compressors;
	354	}
	355	ret = register_filesystem(&jffs2_fs_type);
	356	if (ret) {
	357	printk(KERN_ERR "JFFS2 error: Failed to register filesystem\n");
	358	goto out_slab;
	359	}
	360	return 0;
	361
	362	out_slab:
	363	jffs2_destroy_slab_caches();
	364	out_compressors:
	365	jffs2_compressors_exit();
	366	out:
	367	kmem_cache_destroy(jffs2_inode_cachep);
	368	return ret;
	369	}
	370
	371	static void __exit exit_jffs2_fs(void)
	372	{
	373	unregister_filesystem(&jffs2_fs_type);
	374	jffs2_destroy_slab_caches();
	375	jffs2_compressors_exit();
	376	kmem_cache_destroy(jffs2_inode_cachep);
	377	}
	378
	379	module_init(init_jffs2_fs);
	380	module_exit(exit_jffs2_fs);
	381
	382	MODULE_DESCRIPTION("The Journalling Flash File System, v2");
	383	MODULE_AUTHOR("Red Hat, Inc.");
182ec4ee	384	MODULE_LICENSE("GPL"); // Actually dual-licensed, but it doesn't matter for
1da177e4	385	// the sake of this tag. It's Free Software.