[linux-block.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/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, GFP_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 int jffs2_get_sb_mtd(struct file_system_type *fs_type,
			    int flags, const char *dev_name,
			    void *data, struct mtd_info *mtd,
			    struct vfsmount *mnt)
{
	struct super_block *sb;
	struct jffs2_sb_info *c;
	int ret;

	c = kzalloc(sizeof(*c), GFP_KERNEL);
	if (!c)
		return -ENOMEM;
	c->mtd = mtd;

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

	if (IS_ERR(sb))
		goto out_error;

	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));
		ret = simple_set_mnt(mnt, sb);
		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 ret;
	}

	sb->s_flags |= MS_ACTIVE;
	return simple_set_mnt(mnt, sb);

out_error:
	ret = PTR_ERR(sb);
 out_put:
	kfree(c);
	put_mtd_device(mtd);

	return ret;
}

static int jffs2_get_sb_mtdnr(struct file_system_type *fs_type,
			      int flags, const char *dev_name,
			      void *data, int mtdnr,
			      struct vfsmount *mnt)
{
	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 -EINVAL;
	}

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

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

	if (!dev_name)
		return -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, mnt);
					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, mnt);
			}
		}
	}

	/* 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;

	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, mnt);

out:
	path_release(&nd);
	return 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;

	/* Paranoia checks for on-medium structures. If we ask GCC
	   to pack them with __attribute__((packed)) then it _also_
	   assumes that they're not aligned -- so it emits crappy
	   code on some architectures. Ideally we want an attribute
	   which means just 'no padding', without the alignment
	   thing. But GCC doesn't have that -- we have to just
	   hope the structs are the right sizes, instead. */
	BUILD_BUG_ON(sizeof(struct jffs2_unknown_node) != 12);
	BUILD_BUG_ON(sizeof(struct jffs2_raw_dirent) != 40);
	BUILD_BUG_ON(sizeof(struct jffs2_raw_inode) != 68);
	BUILD_BUG_ON(sizeof(struct jffs2_raw_summary) != 32);

	printk(KERN_INFO "JFFS2 version 2.2."
#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
	       " (NAND)"
#endif
#ifdef CONFIG_JFFS2_SUMMARY
	       " (SUMMARY) "
#endif
	       " (C) 2001-2006 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
1da177e4 LT	14	#include <linux/kernel.h>
	15	#include <linux/module.h>
	16	#include <linux/slab.h>
	17	#include <linux/init.h>
	18	#include <linux/list.h>
	19	#include <linux/fs.h>
	20	#include <linux/mount.h>
	21	#include <linux/jffs2.h>
	22	#include <linux/pagemap.h>
	23	#include <linux/mtd/mtd.h>
	24	#include <linux/ctype.h>
	25	#include <linux/namei.h>
	26	#include "compr.h"
	27	#include "nodelist.h"
	28
	29	static void jffs2_put_super(struct super_block *);
	30
	31	static kmem_cache_t *jffs2_inode_cachep;
	32
	33	static struct inode jffs2_alloc_inode(struct super_block sb)
	34	{
	35	struct jffs2_inode_info *ei;
e94b1766	36	ei = (struct jffs2_inode_info *)kmem_cache_alloc(jffs2_inode_cachep, GFP_KERNEL);
1da177e4 LT	37	if (!ei)
	38	return NULL;
	39	return &ei->vfs_inode;
	40	}
	41
	42	static void jffs2_destroy_inode(struct inode *inode)
	43	{
	44	kmem_cache_free(jffs2_inode_cachep, JFFS2_INODE_INFO(inode));
	45	}
	46
	47	static void jffs2_i_init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
	48	{
	49	struct jffs2_inode_info ei = (struct jffs2_inode_info ) foo;
	50
	51	if ((flags & (SLAB_CTOR_VERIFY\|SLAB_CTOR_CONSTRUCTOR)) ==
	52	SLAB_CTOR_CONSTRUCTOR) {
21eeb7aa	53	init_MUTEX(&ei->sem);
1da177e4 LT	54	inode_init_once(&ei->vfs_inode);
	55	}
	56	}
	57
	58	static int jffs2_sync_fs(struct super_block *sb, int wait)
	59	{
	60	struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
	61
	62	down(&c->alloc_sem);
	63	jffs2_flush_wbuf_pad(c);
182ec4ee	64	up(&c->alloc_sem);
1da177e4 LT	65	return 0;
	66	}
	67
	68	static struct super_operations jffs2_super_operations =
	69	{
	70	.alloc_inode = jffs2_alloc_inode,
	71	.destroy_inode =jffs2_destroy_inode,
	72	.read_inode = jffs2_read_inode,
	73	.put_super = jffs2_put_super,
	74	.write_super = jffs2_write_super,
	75	.statfs = jffs2_statfs,
	76	.remount_fs = jffs2_remount_fs,
	77	.clear_inode = jffs2_clear_inode,
	78	.dirty_inode = jffs2_dirty_inode,
	79	.sync_fs = jffs2_sync_fs,
	80	};
	81
	82	static int jffs2_sb_compare(struct super_block sb, void data)
	83	{
	84	struct jffs2_sb_info *p = data;
	85	struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
	86
	87	/* The superblocks are considered to be equivalent if the underlying MTD
	88	device is the same one */
	89	if (c->mtd == p->mtd) {
	90	D1(printk(KERN_DEBUG "jffs2_sb_compare: match on device %d (\"%s\")\n", p->mtd->index, p->mtd->name));
	91	return 1;
	92	} else {
	93	D1(printk(KERN_DEBUG "jffs2_sb_compare: No match, device %d (\"%s\"), device %d (\"%s\")\n",
	94	c->mtd->index, c->mtd->name, p->mtd->index, p->mtd->name));
	95	return 0;
	96	}
	97	}
	98
	99	static int jffs2_sb_set(struct super_block sb, void data)
	100	{
	101	struct jffs2_sb_info *p = data;
	102
	103	/* For persistence of NFS exports etc. we use the same s_dev
	104	each time we mount the device, don't just use an anonymous
	105	device */
	106	sb->s_fs_info = p;
	107	p->os_priv = sb;
	108	sb->s_dev = MKDEV(MTD_BLOCK_MAJOR, p->mtd->index);
	109
	110	return 0;
	111	}
	112
454e2398 DH	113	static int jffs2_get_sb_mtd(struct file_system_type *fs_type,
	114	int flags, const char *dev_name,
	115	void data, struct mtd_info mtd,
	116	struct vfsmount *mnt)
1da177e4 LT	117	{
	118	struct super_block *sb;
	119	struct jffs2_sb_info *c;
	120	int ret;
	121
f8314dc6	122	c = kzalloc(sizeof(*c), GFP_KERNEL);
1da177e4	123	if (!c)
454e2398	124	return -ENOMEM;
1da177e4 LT	125	c->mtd = mtd;
	126
	127	sb = sget(fs_type, jffs2_sb_compare, jffs2_sb_set, c);
	128
	129	if (IS_ERR(sb))
454e2398	130	goto out_error;
1da177e4 LT	131
	132	if (sb->s_root) {
	133	/* New mountpoint for JFFS2 which is already mounted */
	134	D1(printk(KERN_DEBUG "jffs2_get_sb_mtd(): Device %d (\"%s\") is already mounted\n",
	135	mtd->index, mtd->name));
454e2398	136	ret = simple_set_mnt(mnt, sb);
1da177e4 LT	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);
454e2398	164	return ret;
1da177e4 LT	165	}
	166
	167	sb->s_flags \|= MS_ACTIVE;
454e2398	168	return simple_set_mnt(mnt, sb);
1da177e4	169
454e2398 DH	170	out_error:
454e2398 DH	171	ret = PTR_ERR(sb);
1da177e4 LT	172	out_put:
	173	kfree(c);
	174	put_mtd_device(mtd);
	175
454e2398	176	return ret;
1da177e4 LT	177	}
1da177e4 LT	178
454e2398 DH	179	static int jffs2_get_sb_mtdnr(struct file_system_type *fs_type,
	180	int flags, const char *dev_name,
	181	void *data, int mtdnr,
	182	struct vfsmount *mnt)
1da177e4 LT	183	{
	184	struct mtd_info *mtd;
	185
	186	mtd = get_mtd_device(NULL, mtdnr);
	187	if (!mtd) {
	188	D1(printk(KERN_DEBUG "jffs2: MTD device #%u doesn't appear to exist\n", mtdnr));
454e2398	189	return -EINVAL;
1da177e4 LT	190	}
1da177e4 LT	191
454e2398	192	return jffs2_get_sb_mtd(fs_type, flags, dev_name, data, mtd, mnt);
1da177e4 LT	193	}
1da177e4 LT	194
454e2398 DH	195	static int jffs2_get_sb(struct file_system_type *fs_type,
	196	int flags, const char *dev_name,
	197	void data, struct vfsmount mnt)
1da177e4 LT	198	{
	199	int err;
	200	struct nameidata nd;
	201	int mtdnr;
	202
	203	if (!dev_name)
454e2398	204	return -EINVAL;
1da177e4 LT	205
	206	D1(printk(KERN_DEBUG "jffs2_get_sb(): dev_name \"%s\"\n", dev_name));
	207
	208	/* The preferred way of mounting in future; especially when
	209	CONFIG_BLK_DEV is implemented - we specify the underlying
182ec4ee	210	MTD device by number or by name, so that we don't require
1da177e4 LT	211	block device support to be present in the kernel. */
	212
	213	/* FIXME: How to do the root fs this way? */
	214
	215	if (dev_name[0] == 'm' && dev_name[1] == 't' && dev_name[2] == 'd') {
	216	/* Probably mounting without the blkdev crap */
	217	if (dev_name[3] == ':') {
	218	struct mtd_info *mtd;
	219
	220	/* Mount by MTD device name */
	221	D1(printk(KERN_DEBUG "jffs2_get_sb(): mtd:%%s, name \"%s\"\n", dev_name+4));
	222	for (mtdnr = 0; mtdnr < MAX_MTD_DEVICES; mtdnr++) {
	223	mtd = get_mtd_device(NULL, mtdnr);
	224	if (mtd) {
	225	if (!strcmp(mtd->name, dev_name+4))
454e2398	226	return jffs2_get_sb_mtd(fs_type, flags, dev_name, data, mtd, mnt);
1da177e4 LT	227	put_mtd_device(mtd);
	228	}
	229	}
	230	printk(KERN_NOTICE "jffs2_get_sb(): MTD device with name \"%s\" not found.\n", dev_name+4);
	231	} else if (isdigit(dev_name[3])) {
	232	/* Mount by MTD device number name */
	233	char *endptr;
182ec4ee	234
1da177e4 LT	235	mtdnr = simple_strtoul(dev_name+3, &endptr, 0);
	236	if (!*endptr) {
	237	/* It was a valid number */
	238	D1(printk(KERN_DEBUG "jffs2_get_sb(): mtd%%d, mtdnr %d\n", mtdnr));
454e2398	239	return jffs2_get_sb_mtdnr(fs_type, flags, dev_name, data, mtdnr, mnt);
1da177e4 LT	240	}
	241	}
	242	}
	243
182ec4ee	244	/* Try the old way - the hack where we allowed users to mount
1da177e4 LT	245	/dev/mtdblock$(n) but didn't actually _use_ the blkdev */
	246
	247	err = path_lookup(dev_name, LOOKUP_FOLLOW, &nd);
	248
	249	D1(printk(KERN_DEBUG "jffs2_get_sb(): path_lookup() returned %d, inode %p\n",
	250	err, nd.dentry->d_inode));
	251
	252	if (err)
454e2398	253	return err;
1da177e4 LT	254
	255	err = -EINVAL;
	256
	257	if (!S_ISBLK(nd.dentry->d_inode->i_mode))
	258	goto out;
	259
	260	if (nd.mnt->mnt_flags & MNT_NODEV) {
	261	err = -EACCES;
	262	goto out;
	263	}
	264
	265	if (imajor(nd.dentry->d_inode) != MTD_BLOCK_MAJOR) {
9b04c997	266	if (!(flags & MS_SILENT))
1da177e4 LT	267	printk(KERN_NOTICE "Attempt to mount non-MTD device \"%s\" as JFFS2\n",
	268	dev_name);
	269	goto out;
	270	}
	271
	272	mtdnr = iminor(nd.dentry->d_inode);
	273	path_release(&nd);
	274
454e2398	275	return jffs2_get_sb_mtdnr(fs_type, flags, dev_name, data, mtdnr, mnt);
1da177e4 LT	276
	277	out:
	278	path_release(&nd);
454e2398	279	return err;
1da177e4 LT	280	}
	281
	282	static void jffs2_put_super (struct super_block *sb)
	283	{
	284	struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
	285
	286	D2(printk(KERN_DEBUG "jffs2: jffs2_put_super()\n"));
	287
1da177e4 LT	288	down(&c->alloc_sem);
	289	jffs2_flush_wbuf_pad(c);
	290	up(&c->alloc_sem);
e631ddba FH	291
	292	jffs2_sum_exit(c);
	293
1da177e4 LT	294	jffs2_free_ino_caches(c);
1da177e4 LT	295	jffs2_free_raw_node_refs(c);
4ce1f562	296	if (jffs2_blocks_use_vmalloc(c))
1da177e4 LT	297	vfree(c->blocks);
	298	else
	299	kfree(c->blocks);
	300	jffs2_flash_cleanup(c);
	301	kfree(c->inocache_list);
aa98d7cf	302	jffs2_clear_xattr_subsystem(c);
1da177e4 LT	303	if (c->mtd->sync)
	304	c->mtd->sync(c->mtd);
	305
	306	D1(printk(KERN_DEBUG "jffs2_put_super returning\n"));
	307	}
	308
	309	static void jffs2_kill_sb(struct super_block *sb)
	310	{
	311	struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
a69dde91 AB	312	if (!(sb->s_flags & MS_RDONLY))
a69dde91 AB	313	jffs2_stop_garbage_collect_thread(c);
1da177e4 LT	314	generic_shutdown_super(sb);
	315	put_mtd_device(c->mtd);
	316	kfree(c);
	317	}
	318
	319	static struct file_system_type jffs2_fs_type = {
	320	.owner = THIS_MODULE,
	321	.name = "jffs2",
	322	.get_sb = jffs2_get_sb,
	323	.kill_sb = jffs2_kill_sb,
	324	};
	325
	326	static int __init init_jffs2_fs(void)
	327	{
	328	int ret;
	329
3e68fbb5 DW	330	/* Paranoia checks for on-medium structures. If we ask GCC
	331	to pack them with __attribute__((packed)) then it _also_
	332	assumes that they're not aligned -- so it emits crappy
	333	code on some architectures. Ideally we want an attribute
	334	which means just 'no padding', without the alignment
	335	thing. But GCC doesn't have that -- we have to just
	336	hope the structs are the right sizes, instead. */
2ecd05ae AD	337	BUILD_BUG_ON(sizeof(struct jffs2_unknown_node) != 12);
	338	BUILD_BUG_ON(sizeof(struct jffs2_raw_dirent) != 40);
	339	BUILD_BUG_ON(sizeof(struct jffs2_raw_inode) != 68);
	340	BUILD_BUG_ON(sizeof(struct jffs2_raw_summary) != 32);
3e68fbb5	341
1da177e4	342	printk(KERN_INFO "JFFS2 version 2.2."
2f82ce1e	343	#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
1da177e4	344	" (NAND)"
e631ddba FH	345	#endif
	346	#ifdef CONFIG_JFFS2_SUMMARY
	347	" (SUMMARY) "
1da177e4	348	#endif
3e68fbb5	349	" (C) 2001-2006 Red Hat, Inc.\n");
1da177e4 LT	350
	351	jffs2_inode_cachep = kmem_cache_create("jffs2_i",
	352	sizeof(struct jffs2_inode_info),
fffb60f9 PJ	353	0, (SLAB_RECLAIM_ACCOUNT\|
fffb60f9 PJ	354	SLAB_MEM_SPREAD),
1da177e4 LT	355	jffs2_i_init_once, NULL);
	356	if (!jffs2_inode_cachep) {
	357	printk(KERN_ERR "JFFS2 error: Failed to initialise inode cache\n");
	358	return -ENOMEM;
	359	}
	360	ret = jffs2_compressors_init();
	361	if (ret) {
	362	printk(KERN_ERR "JFFS2 error: Failed to initialise compressors\n");
	363	goto out;
	364	}
	365	ret = jffs2_create_slab_caches();
	366	if (ret) {
	367	printk(KERN_ERR "JFFS2 error: Failed to initialise slab caches\n");
	368	goto out_compressors;
	369	}
	370	ret = register_filesystem(&jffs2_fs_type);
	371	if (ret) {
	372	printk(KERN_ERR "JFFS2 error: Failed to register filesystem\n");
	373	goto out_slab;
	374	}
	375	return 0;
	376
	377	out_slab:
	378	jffs2_destroy_slab_caches();
	379	out_compressors:
	380	jffs2_compressors_exit();
	381	out:
	382	kmem_cache_destroy(jffs2_inode_cachep);
	383	return ret;
	384	}
	385
	386	static void __exit exit_jffs2_fs(void)
	387	{
	388	unregister_filesystem(&jffs2_fs_type);
	389	jffs2_destroy_slab_caches();
	390	jffs2_compressors_exit();
	391	kmem_cache_destroy(jffs2_inode_cachep);
	392	}
	393
	394	module_init(init_jffs2_fs);
	395	module_exit(exit_jffs2_fs);
	396
	397	MODULE_DESCRIPTION("The Journalling Flash File System, v2");
	398	MODULE_AUTHOR("Red Hat, Inc.");
182ec4ee	399	MODULE_LICENSE("GPL"); // Actually dual-licensed, but it doesn't matter for
1da177e4	400	// the sake of this tag. It's Free Software.