[mirror_ubuntu-artful-kernel.git] / fs / jffs2 / super.c

/*
 * JFFS2 -- Journalling Flash File System, Version 2.
 *
 * Copyright © 2001-2007 Red Hat, Inc.
 *
 * Created by David Woodhouse <dwmw2@infradead.org>
 *
 * For licensing information, see the file 'LICENCE' in this directory.
 *
 */

#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/err.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 struct kmem_cache *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, struct kmem_cache * 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 const 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 (IS_ERR(mtd)) {
		D1(printk(KERN_DEBUG "jffs2: MTD device #%u doesn't appear to exist\n", mtdnr));
		return PTR_ERR(mtd);
	}

	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 (!IS_ERR(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
	       " © 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	*
c00c310e	4	* Copyright © 2001-2007 Red Hat, Inc.
1da177e4 LT	5	*
	6	* Created by David Woodhouse <dwmw2@infradead.org>
	7	*
	8	* For licensing information, see the file 'LICENCE' in this directory.
	9	*
1da177e4 LT	10	*/
1da177e4 LT	11
1da177e4 LT	12	#include <linux/kernel.h>
	13	#include <linux/module.h>
	14	#include <linux/slab.h>
	15	#include <linux/init.h>
	16	#include <linux/list.h>
	17	#include <linux/fs.h>
9c74034f	18	#include <linux/err.h>
1da177e4 LT	19	#include <linux/mount.h>
	20	#include <linux/jffs2.h>
	21	#include <linux/pagemap.h>
	22	#include <linux/mtd/mtd.h>
	23	#include <linux/ctype.h>
	24	#include <linux/namei.h>
	25	#include "compr.h"
	26	#include "nodelist.h"
	27
	28	static void jffs2_put_super(struct super_block *);
	29
e18b890b	30	static struct kmem_cache *jffs2_inode_cachep;
1da177e4 LT	31
	32	static struct inode jffs2_alloc_inode(struct super_block sb)
	33	{
	34	struct jffs2_inode_info *ei;
e94b1766	35	ei = (struct jffs2_inode_info *)kmem_cache_alloc(jffs2_inode_cachep, GFP_KERNEL);
1da177e4 LT	36	if (!ei)
	37	return NULL;
	38	return &ei->vfs_inode;
	39	}
	40
	41	static void jffs2_destroy_inode(struct inode *inode)
	42	{
	43	kmem_cache_free(jffs2_inode_cachep, JFFS2_INODE_INFO(inode));
	44	}
	45
e18b890b	46	static void jffs2_i_init_once(void * foo, struct kmem_cache * cachep, unsigned long flags)
1da177e4 LT	47	{
	48	struct jffs2_inode_info ei = (struct jffs2_inode_info ) foo;
	49
	50	if ((flags & (SLAB_CTOR_VERIFY\|SLAB_CTOR_CONSTRUCTOR)) ==
	51	SLAB_CTOR_CONSTRUCTOR) {
21eeb7aa	52	init_MUTEX(&ei->sem);
1da177e4 LT	53	inode_init_once(&ei->vfs_inode);
	54	}
	55	}
	56
	57	static int jffs2_sync_fs(struct super_block *sb, int wait)
	58	{
	59	struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
	60
	61	down(&c->alloc_sem);
	62	jffs2_flush_wbuf_pad(c);
182ec4ee	63	up(&c->alloc_sem);
1da177e4 LT	64	return 0;
	65	}
	66
ee9b6d61	67	static const struct super_operations jffs2_super_operations =
1da177e4 LT	68	{
	69	.alloc_inode = jffs2_alloc_inode,
	70	.destroy_inode =jffs2_destroy_inode,
	71	.read_inode = jffs2_read_inode,
	72	.put_super = jffs2_put_super,
	73	.write_super = jffs2_write_super,
	74	.statfs = jffs2_statfs,
	75	.remount_fs = jffs2_remount_fs,
	76	.clear_inode = jffs2_clear_inode,
	77	.dirty_inode = jffs2_dirty_inode,
	78	.sync_fs = jffs2_sync_fs,
	79	};
	80
	81	static int jffs2_sb_compare(struct super_block sb, void data)
	82	{
	83	struct jffs2_sb_info *p = data;
	84	struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
	85
	86	/* The superblocks are considered to be equivalent if the underlying MTD
	87	device is the same one */
	88	if (c->mtd == p->mtd) {
	89	D1(printk(KERN_DEBUG "jffs2_sb_compare: match on device %d (\"%s\")\n", p->mtd->index, p->mtd->name));
	90	return 1;
	91	} else {
	92	D1(printk(KERN_DEBUG "jffs2_sb_compare: No match, device %d (\"%s\"), device %d (\"%s\")\n",
	93	c->mtd->index, c->mtd->name, p->mtd->index, p->mtd->name));
	94	return 0;
	95	}
	96	}
	97
	98	static int jffs2_sb_set(struct super_block sb, void data)
	99	{
	100	struct jffs2_sb_info *p = data;
	101
	102	/* For persistence of NFS exports etc. we use the same s_dev
	103	each time we mount the device, don't just use an anonymous
	104	device */
	105	sb->s_fs_info = p;
	106	p->os_priv = sb;
	107	sb->s_dev = MKDEV(MTD_BLOCK_MAJOR, p->mtd->index);
	108
	109	return 0;
	110	}
	111
454e2398 DH	112	static int jffs2_get_sb_mtd(struct file_system_type *fs_type,
	113	int flags, const char *dev_name,
	114	void data, struct mtd_info mtd,
	115	struct vfsmount *mnt)
1da177e4 LT	116	{
	117	struct super_block *sb;
	118	struct jffs2_sb_info *c;
	119	int ret;
	120
f8314dc6	121	c = kzalloc(sizeof(*c), GFP_KERNEL);
1da177e4	122	if (!c)
454e2398	123	return -ENOMEM;
1da177e4 LT	124	c->mtd = mtd;
	125
	126	sb = sget(fs_type, jffs2_sb_compare, jffs2_sb_set, c);
	127
	128	if (IS_ERR(sb))
454e2398	129	goto out_error;
1da177e4 LT	130
	131	if (sb->s_root) {
	132	/* New mountpoint for JFFS2 which is already mounted */
	133	D1(printk(KERN_DEBUG "jffs2_get_sb_mtd(): Device %d (\"%s\") is already mounted\n",
	134	mtd->index, mtd->name));
454e2398	135	ret = simple_set_mnt(mnt, sb);
1da177e4 LT	136	goto out_put;
	137	}
	138
	139	D1(printk(KERN_DEBUG "jffs2_get_sb_mtd(): New superblock for device %d (\"%s\")\n",
	140	mtd->index, mtd->name));
	141
b6220598 AB	142	/* Initialize JFFS2 superblock locks, the further initialization will be
	143	* done later */
	144	init_MUTEX(&c->alloc_sem);
	145	init_MUTEX(&c->erase_free_sem);
	146	init_waitqueue_head(&c->erase_wait);
	147	init_waitqueue_head(&c->inocache_wq);
	148	spin_lock_init(&c->erase_completion_lock);
	149	spin_lock_init(&c->inocache_lock);
	150
1da177e4 LT	151	sb->s_op = &jffs2_super_operations;
1da177e4 LT	152	sb->s_flags = flags \| MS_NOATIME;
aa98d7cf KK	153	sb->s_xattr = jffs2_xattr_handlers;
	154	#ifdef CONFIG_JFFS2_FS_POSIX_ACL
	155	sb->s_flags \|= MS_POSIXACL;
	156	#endif
9b04c997	157	ret = jffs2_do_fill_super(sb, data, flags & MS_SILENT ? 1 : 0);
1da177e4 LT	158
	159	if (ret) {
	160	/* Failure case... */
	161	up_write(&sb->s_umount);
	162	deactivate_super(sb);
454e2398	163	return ret;
1da177e4 LT	164	}
	165
	166	sb->s_flags \|= MS_ACTIVE;
454e2398	167	return simple_set_mnt(mnt, sb);
1da177e4	168
454e2398 DH	169	out_error:
454e2398 DH	170	ret = PTR_ERR(sb);
1da177e4 LT	171	out_put:
	172	kfree(c);
	173	put_mtd_device(mtd);
	174
454e2398	175	return ret;
1da177e4 LT	176	}
1da177e4 LT	177
454e2398 DH	178	static int jffs2_get_sb_mtdnr(struct file_system_type *fs_type,
	179	int flags, const char *dev_name,
	180	void *data, int mtdnr,
	181	struct vfsmount *mnt)
1da177e4 LT	182	{
	183	struct mtd_info *mtd;
	184
	185	mtd = get_mtd_device(NULL, mtdnr);
9c74034f	186	if (IS_ERR(mtd)) {
1da177e4	187	D1(printk(KERN_DEBUG "jffs2: MTD device #%u doesn't appear to exist\n", mtdnr));
9c74034f	188	return PTR_ERR(mtd);
1da177e4 LT	189	}
1da177e4 LT	190
454e2398	191	return jffs2_get_sb_mtd(fs_type, flags, dev_name, data, mtd, mnt);
1da177e4 LT	192	}
1da177e4 LT	193
454e2398 DH	194	static int jffs2_get_sb(struct file_system_type *fs_type,
	195	int flags, const char *dev_name,
	196	void data, struct vfsmount mnt)
1da177e4 LT	197	{
	198	int err;
	199	struct nameidata nd;
	200	int mtdnr;
	201
	202	if (!dev_name)
454e2398	203	return -EINVAL;
1da177e4 LT	204
	205	D1(printk(KERN_DEBUG "jffs2_get_sb(): dev_name \"%s\"\n", dev_name));
	206
	207	/* The preferred way of mounting in future; especially when
	208	CONFIG_BLK_DEV is implemented - we specify the underlying
182ec4ee	209	MTD device by number or by name, so that we don't require
1da177e4 LT	210	block device support to be present in the kernel. */
	211
	212	/* FIXME: How to do the root fs this way? */
	213
	214	if (dev_name[0] == 'm' && dev_name[1] == 't' && dev_name[2] == 'd') {
	215	/* Probably mounting without the blkdev crap */
	216	if (dev_name[3] == ':') {
	217	struct mtd_info *mtd;
	218
	219	/* Mount by MTD device name */
	220	D1(printk(KERN_DEBUG "jffs2_get_sb(): mtd:%%s, name \"%s\"\n", dev_name+4));
	221	for (mtdnr = 0; mtdnr < MAX_MTD_DEVICES; mtdnr++) {
	222	mtd = get_mtd_device(NULL, mtdnr);
9c74034f	223	if (!IS_ERR(mtd)) {
1da177e4	224	if (!strcmp(mtd->name, dev_name+4))
454e2398	225	return jffs2_get_sb_mtd(fs_type, flags, dev_name, data, mtd, mnt);
1da177e4 LT	226	put_mtd_device(mtd);
	227	}
	228	}
	229	printk(KERN_NOTICE "jffs2_get_sb(): MTD device with name \"%s\" not found.\n", dev_name+4);
	230	} else if (isdigit(dev_name[3])) {
	231	/* Mount by MTD device number name */
	232	char *endptr;
182ec4ee	233
1da177e4 LT	234	mtdnr = simple_strtoul(dev_name+3, &endptr, 0);
	235	if (!*endptr) {
	236	/* It was a valid number */
	237	D1(printk(KERN_DEBUG "jffs2_get_sb(): mtd%%d, mtdnr %d\n", mtdnr));
454e2398	238	return jffs2_get_sb_mtdnr(fs_type, flags, dev_name, data, mtdnr, mnt);
1da177e4 LT	239	}
	240	}
	241	}
	242
182ec4ee	243	/* Try the old way - the hack where we allowed users to mount
1da177e4 LT	244	/dev/mtdblock$(n) but didn't actually _use_ the blkdev */
	245
	246	err = path_lookup(dev_name, LOOKUP_FOLLOW, &nd);
	247
	248	D1(printk(KERN_DEBUG "jffs2_get_sb(): path_lookup() returned %d, inode %p\n",
	249	err, nd.dentry->d_inode));
	250
	251	if (err)
454e2398	252	return err;
1da177e4 LT	253
	254	err = -EINVAL;
	255
	256	if (!S_ISBLK(nd.dentry->d_inode->i_mode))
	257	goto out;
	258
	259	if (nd.mnt->mnt_flags & MNT_NODEV) {
	260	err = -EACCES;
	261	goto out;
	262	}
	263
	264	if (imajor(nd.dentry->d_inode) != MTD_BLOCK_MAJOR) {
9b04c997	265	if (!(flags & MS_SILENT))
1da177e4 LT	266	printk(KERN_NOTICE "Attempt to mount non-MTD device \"%s\" as JFFS2\n",
	267	dev_name);
	268	goto out;
	269	}
	270
	271	mtdnr = iminor(nd.dentry->d_inode);
	272	path_release(&nd);
	273
454e2398	274	return jffs2_get_sb_mtdnr(fs_type, flags, dev_name, data, mtdnr, mnt);
1da177e4 LT	275
	276	out:
	277	path_release(&nd);
454e2398	278	return err;
1da177e4 LT	279	}
	280
	281	static void jffs2_put_super (struct super_block *sb)
	282	{
	283	struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
	284
	285	D2(printk(KERN_DEBUG "jffs2: jffs2_put_super()\n"));
	286
1da177e4 LT	287	down(&c->alloc_sem);
	288	jffs2_flush_wbuf_pad(c);
	289	up(&c->alloc_sem);
e631ddba FH	290
	291	jffs2_sum_exit(c);
	292
1da177e4 LT	293	jffs2_free_ino_caches(c);
1da177e4 LT	294	jffs2_free_raw_node_refs(c);
4ce1f562	295	if (jffs2_blocks_use_vmalloc(c))
1da177e4 LT	296	vfree(c->blocks);
	297	else
	298	kfree(c->blocks);
	299	jffs2_flash_cleanup(c);
	300	kfree(c->inocache_list);
aa98d7cf	301	jffs2_clear_xattr_subsystem(c);
1da177e4 LT	302	if (c->mtd->sync)
	303	c->mtd->sync(c->mtd);
	304
	305	D1(printk(KERN_DEBUG "jffs2_put_super returning\n"));
	306	}
	307
	308	static void jffs2_kill_sb(struct super_block *sb)
	309	{
	310	struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
a69dde91 AB	311	if (!(sb->s_flags & MS_RDONLY))
a69dde91 AB	312	jffs2_stop_garbage_collect_thread(c);
1da177e4 LT	313	generic_shutdown_super(sb);
	314	put_mtd_device(c->mtd);
	315	kfree(c);
	316	}
	317
	318	static struct file_system_type jffs2_fs_type = {
	319	.owner = THIS_MODULE,
	320	.name = "jffs2",
	321	.get_sb = jffs2_get_sb,
	322	.kill_sb = jffs2_kill_sb,
	323	};
	324
	325	static int __init init_jffs2_fs(void)
	326	{
	327	int ret;
	328
3e68fbb5 DW	329	/* Paranoia checks for on-medium structures. If we ask GCC
	330	to pack them with __attribute__((packed)) then it _also_
	331	assumes that they're not aligned -- so it emits crappy
	332	code on some architectures. Ideally we want an attribute
	333	which means just 'no padding', without the alignment
	334	thing. But GCC doesn't have that -- we have to just
	335	hope the structs are the right sizes, instead. */
2ecd05ae AD	336	BUILD_BUG_ON(sizeof(struct jffs2_unknown_node) != 12);
	337	BUILD_BUG_ON(sizeof(struct jffs2_raw_dirent) != 40);
	338	BUILD_BUG_ON(sizeof(struct jffs2_raw_inode) != 68);
	339	BUILD_BUG_ON(sizeof(struct jffs2_raw_summary) != 32);
3e68fbb5	340
1da177e4	341	printk(KERN_INFO "JFFS2 version 2.2."
2f82ce1e	342	#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
1da177e4	343	" (NAND)"
e631ddba FH	344	#endif
	345	#ifdef CONFIG_JFFS2_SUMMARY
	346	" (SUMMARY) "
1da177e4	347	#endif
c00c310e	348	" © 2001-2006 Red Hat, Inc.\n");
1da177e4 LT	349
	350	jffs2_inode_cachep = kmem_cache_create("jffs2_i",
	351	sizeof(struct jffs2_inode_info),
fffb60f9 PJ	352	0, (SLAB_RECLAIM_ACCOUNT\|
fffb60f9 PJ	353	SLAB_MEM_SPREAD),
1da177e4 LT	354	jffs2_i_init_once, NULL);
	355	if (!jffs2_inode_cachep) {
	356	printk(KERN_ERR "JFFS2 error: Failed to initialise inode cache\n");
	357	return -ENOMEM;
	358	}
	359	ret = jffs2_compressors_init();
	360	if (ret) {
	361	printk(KERN_ERR "JFFS2 error: Failed to initialise compressors\n");
	362	goto out;
	363	}
	364	ret = jffs2_create_slab_caches();
	365	if (ret) {
	366	printk(KERN_ERR "JFFS2 error: Failed to initialise slab caches\n");
	367	goto out_compressors;
	368	}
	369	ret = register_filesystem(&jffs2_fs_type);
	370	if (ret) {
	371	printk(KERN_ERR "JFFS2 error: Failed to register filesystem\n");
	372	goto out_slab;
	373	}
	374	return 0;
	375
	376	out_slab:
	377	jffs2_destroy_slab_caches();
	378	out_compressors:
	379	jffs2_compressors_exit();
	380	out:
	381	kmem_cache_destroy(jffs2_inode_cachep);
	382	return ret;
	383	}
	384
	385	static void __exit exit_jffs2_fs(void)
	386	{
	387	unregister_filesystem(&jffs2_fs_type);
	388	jffs2_destroy_slab_caches();
	389	jffs2_compressors_exit();
	390	kmem_cache_destroy(jffs2_inode_cachep);
	391	}
	392
	393	module_init(init_jffs2_fs);
	394	module_exit(exit_jffs2_fs);
	395
	396	MODULE_DESCRIPTION("The Journalling Flash File System, v2");
	397	MODULE_AUTHOR("Red Hat, Inc.");
182ec4ee	398	MODULE_LICENSE("GPL"); // Actually dual-licensed, but it doesn't matter for
1da177e4	399	// the sake of this tag. It's Free Software.