[linux.git] / fs / jffs2 / super.c

/*
 * JFFS2 -- Journalling Flash File System, Version 2.
 *
 * Copyright © 2001-2007 Red Hat, Inc.
 *
 * Created by David Woodhouse <[email protected]>
 *
 * 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/parser.h>
#include <linux/jffs2.h>
#include <linux/pagemap.h>
#include <linux/mtd/super.h>
#include <linux/ctype.h>
#include <linux/namei.h>
#include <linux/seq_file.h>
#include <linux/exportfs.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 *f;

	f = kmem_cache_alloc(jffs2_inode_cachep, GFP_KERNEL);
	if (!f)
		return NULL;
	return &f->vfs_inode;
}

static void jffs2_i_callback(struct rcu_head *head)
{
	struct inode *inode = container_of(head, struct inode, i_rcu);
	INIT_LIST_HEAD(&inode->i_dentry);
	kmem_cache_free(jffs2_inode_cachep, JFFS2_INODE_INFO(inode));
}

static void jffs2_destroy_inode(struct inode *inode)
{
	call_rcu(&inode->i_rcu, jffs2_i_callback);
}

static void jffs2_i_init_once(void *foo)
{
	struct jffs2_inode_info *f = foo;

	mutex_init(&f->sem);
	inode_init_once(&f->vfs_inode);
}

static void jffs2_write_super(struct super_block *sb)
{
	struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);

	lock_super(sb);
	sb->s_dirt = 0;

	if (!(sb->s_flags & MS_RDONLY)) {
		D1(printk(KERN_DEBUG "jffs2_write_super()\n"));
		jffs2_flush_wbuf_gc(c, 0);
	}

	unlock_super(sb);
}

static const char *jffs2_compr_name(unsigned int compr)
{
	switch (compr) {
	case JFFS2_COMPR_MODE_NONE:
		return "none";
#ifdef CONFIG_JFFS2_LZO
	case JFFS2_COMPR_MODE_FORCELZO:
		return "lzo";
#endif
#ifdef CONFIG_JFFS2_ZLIB
	case JFFS2_COMPR_MODE_FORCEZLIB:
		return "zlib";
#endif
	default:
		/* should never happen; programmer error */
		WARN_ON(1);
		return "";
	}
}

static int jffs2_show_options(struct seq_file *s, struct vfsmount *mnt)
{
	struct jffs2_sb_info *c = JFFS2_SB_INFO(mnt->mnt_sb);
	struct jffs2_mount_opts *opts = &c->mount_opts;

	if (opts->override_compr)
		seq_printf(s, ",compr=%s", jffs2_compr_name(opts->compr));

	return 0;
}

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

	jffs2_write_super(sb);

	mutex_lock(&c->alloc_sem);
	jffs2_flush_wbuf_pad(c);
	mutex_unlock(&c->alloc_sem);
	return 0;
}

static struct inode *jffs2_nfs_get_inode(struct super_block *sb, uint64_t ino,
					 uint32_t generation)
{
	/* We don't care about i_generation. We'll destroy the flash
	   before we start re-using inode numbers anyway. And even
	   if that wasn't true, we'd have other problems...*/
	return jffs2_iget(sb, ino);
}

static struct dentry *jffs2_fh_to_dentry(struct super_block *sb, struct fid *fid,
					 int fh_len, int fh_type)
{
        return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
                                    jffs2_nfs_get_inode);
}

static struct dentry *jffs2_fh_to_parent(struct super_block *sb, struct fid *fid,
					 int fh_len, int fh_type)
{
        return generic_fh_to_parent(sb, fid, fh_len, fh_type,
                                    jffs2_nfs_get_inode);
}

static struct dentry *jffs2_get_parent(struct dentry *child)
{
	struct jffs2_inode_info *f;
	uint32_t pino;

	BUG_ON(!S_ISDIR(child->d_inode->i_mode));

	f = JFFS2_INODE_INFO(child->d_inode);

	pino = f->inocache->pino_nlink;

	JFFS2_DEBUG("Parent of directory ino #%u is #%u\n",
		    f->inocache->ino, pino);

	return d_obtain_alias(jffs2_iget(child->d_inode->i_sb, pino));
}

static const struct export_operations jffs2_export_ops = {
	.get_parent = jffs2_get_parent,
	.fh_to_dentry = jffs2_fh_to_dentry,
	.fh_to_parent = jffs2_fh_to_parent,
};

/*
 * JFFS2 mount options.
 *
 * Opt_override_compr: override default compressor
 * Opt_err: just end of array marker
 */
enum {
	Opt_override_compr,
	Opt_err,
};

static const match_table_t tokens = {
	{Opt_override_compr, "compr=%s"},
	{Opt_err, NULL},
};

static int jffs2_parse_options(struct jffs2_sb_info *c, char *data)
{
	substring_t args[MAX_OPT_ARGS];
	char *p, *name;

	if (!data)
		return 0;

	while ((p = strsep(&data, ","))) {
		int token;

		if (!*p)
			continue;

		token = match_token(p, tokens, args);
		switch (token) {
		case Opt_override_compr:
			name = match_strdup(&args[0]);

			if (!name)
				return -ENOMEM;
			if (!strcmp(name, "none"))
				c->mount_opts.compr = JFFS2_COMPR_MODE_NONE;
#ifdef CONFIG_JFFS2_LZO
			else if (!strcmp(name, "lzo"))
				c->mount_opts.compr = JFFS2_COMPR_MODE_FORCELZO;
#endif
#ifdef CONFIG_JFFS2_ZLIB
			else if (!strcmp(name, "zlib"))
				c->mount_opts.compr =
						JFFS2_COMPR_MODE_FORCEZLIB;
#endif
			else {
				printk(KERN_ERR "JFFS2 Error: unknown compressor \"%s\"",
						name);
				kfree(name);
				return -EINVAL;
			}
			kfree(name);
			c->mount_opts.override_compr = true;
			break;
		default:
			printk(KERN_ERR "JFFS2 Error: unrecognized mount option '%s' or missing value\n",
					p);
			return -EINVAL;
		}
	}

	return 0;
}

static int jffs2_remount_fs(struct super_block *sb, int *flags, char *data)
{
	struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
	int err;

	err = jffs2_parse_options(c, data);
	if (err)
		return -EINVAL;

	return jffs2_do_remount_fs(sb, flags, data);
}

static const struct super_operations jffs2_super_operations =
{
	.alloc_inode =	jffs2_alloc_inode,
	.destroy_inode =jffs2_destroy_inode,
	.put_super =	jffs2_put_super,
	.write_super =	jffs2_write_super,
	.statfs =	jffs2_statfs,
	.remount_fs =	jffs2_remount_fs,
	.evict_inode =	jffs2_evict_inode,
	.dirty_inode =	jffs2_dirty_inode,
	.show_options =	jffs2_show_options,
	.sync_fs =	jffs2_sync_fs,
};

/*
 * fill in the superblock
 */
static int jffs2_fill_super(struct super_block *sb, void *data, int silent)
{
	struct jffs2_sb_info *c;
	int ret;

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

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

	c->mtd = sb->s_mtd;
	c->os_priv = sb;
	sb->s_fs_info = c;

	ret = jffs2_parse_options(c, data);
	if (ret) {
		kfree(c);
		return -EINVAL;
	}

	/* Initialize JFFS2 superblock locks, the further initialization will
	 * be done later */
	mutex_init(&c->alloc_sem);
	mutex_init(&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_export_op = &jffs2_export_ops;
	sb->s_flags = sb->s_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, silent);
	return ret;
}

static struct dentry *jffs2_mount(struct file_system_type *fs_type,
			int flags, const char *dev_name,
			void *data)
{
	return mount_mtd(fs_type, flags, dev_name, data, jffs2_fill_super);
}

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_dirt)
		jffs2_write_super(sb);

	mutex_lock(&c->alloc_sem);
	jffs2_flush_wbuf_pad(c);
	mutex_unlock(&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);
	kill_mtd_super(sb);
	kfree(c);
}

static struct file_system_type jffs2_fs_type = {
	.owner =	THIS_MODULE,
	.name =		"jffs2",
	.mount =	jffs2_mount,
	.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);
	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 <[email protected]>
	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	19	#include <linux/mount.h>
92abc475	20	#include <linux/parser.h>
1da177e4 LT	21	#include <linux/jffs2.h>
1da177e4 LT	22	#include <linux/pagemap.h>
acaebfd8	23	#include <linux/mtd/super.h>
1da177e4 LT	24	#include <linux/ctype.h>
1da177e4 LT	25	#include <linux/namei.h>
92abc475	26	#include <linux/seq_file.h>
5f556aab	27	#include <linux/exportfs.h>
1da177e4 LT	28	#include "compr.h"
	29	#include "nodelist.h"
	30
	31	static void jffs2_put_super(struct super_block *);
	32
e18b890b	33	static struct kmem_cache *jffs2_inode_cachep;
1da177e4 LT	34
	35	static struct inode jffs2_alloc_inode(struct super_block sb)
	36	{
4e571aba DW	37	struct jffs2_inode_info *f;
	38
	39	f = kmem_cache_alloc(jffs2_inode_cachep, GFP_KERNEL);
	40	if (!f)
1da177e4	41	return NULL;
4e571aba	42	return &f->vfs_inode;
1da177e4 LT	43	}
1da177e4 LT	44
fa0d7e3d	45	static void jffs2_i_callback(struct rcu_head *head)
1da177e4	46	{
fa0d7e3d NP	47	struct inode *inode = container_of(head, struct inode, i_rcu);
fa0d7e3d NP	48	INIT_LIST_HEAD(&inode->i_dentry);
1da177e4 LT	49	kmem_cache_free(jffs2_inode_cachep, JFFS2_INODE_INFO(inode));
	50	}
	51
fa0d7e3d NP	52	static void jffs2_destroy_inode(struct inode *inode)
	53	{
	54	call_rcu(&inode->i_rcu, jffs2_i_callback);
	55	}
	56
51cc5068	57	static void jffs2_i_init_once(void *foo)
1da177e4	58	{
4e571aba	59	struct jffs2_inode_info *f = foo;
1da177e4	60
4e571aba DW	61	mutex_init(&f->sem);
4e571aba DW	62	inode_init_once(&f->vfs_inode);
1da177e4 LT	63	}
1da177e4 LT	64
01ba6875 CH	65	static void jffs2_write_super(struct super_block *sb)
	66	{
	67	struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
ebc1ac16 CH	68
ebc1ac16 CH	69	lock_super(sb);
01ba6875 CH	70	sb->s_dirt = 0;
01ba6875 CH	71
ebc1ac16 CH	72	if (!(sb->s_flags & MS_RDONLY)) {
ebc1ac16 CH	73	D1(printk(KERN_DEBUG "jffs2_write_super()\n"));
ebc1ac16 CH	74	jffs2_flush_wbuf_gc(c, 0);
ebc1ac16 CH	75	}
01ba6875	76
ebc1ac16	77	unlock_super(sb);
01ba6875 CH	78	}
01ba6875 CH	79
92abc475 AS	80	static const char *jffs2_compr_name(unsigned int compr)
	81	{
	82	switch (compr) {
	83	case JFFS2_COMPR_MODE_NONE:
	84	return "none";
123005f3 AS	85	#ifdef CONFIG_JFFS2_LZO
	86	case JFFS2_COMPR_MODE_FORCELZO:
	87	return "lzo";
	88	#endif
	89	#ifdef CONFIG_JFFS2_ZLIB
	90	case JFFS2_COMPR_MODE_FORCEZLIB:
	91	return "zlib";
	92	#endif
92abc475 AS	93	default:
	94	/* should never happen; programmer error */
	95	WARN_ON(1);
	96	return "";
	97	}
	98	}
	99
	100	static int jffs2_show_options(struct seq_file s, struct vfsmount mnt)
	101	{
	102	struct jffs2_sb_info *c = JFFS2_SB_INFO(mnt->mnt_sb);
	103	struct jffs2_mount_opts *opts = &c->mount_opts;
	104
	105	if (opts->override_compr)
	106	seq_printf(s, ",compr=%s", jffs2_compr_name(opts->compr));
	107
	108	return 0;
	109	}
	110
1da177e4 LT	111	static int jffs2_sync_fs(struct super_block *sb, int wait)
	112	{
	113	struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
	114
d579ed00 CH	115	jffs2_write_super(sb);
d579ed00 CH	116
ced22070	117	mutex_lock(&c->alloc_sem);
1da177e4	118	jffs2_flush_wbuf_pad(c);
ced22070	119	mutex_unlock(&c->alloc_sem);
1da177e4 LT	120	return 0;
	121	}
	122
5f556aab DW	123	static struct inode jffs2_nfs_get_inode(struct super_block sb, uint64_t ino,
	124	uint32_t generation)
	125	{
	126	/* We don't care about i_generation. We'll destroy the flash
	127	before we start re-using inode numbers anyway. And even
	128	if that wasn't true, we'd have other problems...*/
	129	return jffs2_iget(sb, ino);
	130	}
	131
	132	static struct dentry jffs2_fh_to_dentry(struct super_block sb, struct fid *fid,
	133	int fh_len, int fh_type)
	134	{
	135	return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
	136	jffs2_nfs_get_inode);
	137	}
	138
	139	static struct dentry jffs2_fh_to_parent(struct super_block sb, struct fid *fid,
	140	int fh_len, int fh_type)
	141	{
	142	return generic_fh_to_parent(sb, fid, fh_len, fh_type,
	143	jffs2_nfs_get_inode);
	144	}
	145
	146	static struct dentry jffs2_get_parent(struct dentry child)
	147	{
	148	struct jffs2_inode_info *f;
	149	uint32_t pino;
	150
	151	BUG_ON(!S_ISDIR(child->d_inode->i_mode));
	152
	153	f = JFFS2_INODE_INFO(child->d_inode);
	154
	155	pino = f->inocache->pino_nlink;
	156
	157	JFFS2_DEBUG("Parent of directory ino #%u is #%u\n",
	158	f->inocache->ino, pino);
	159
	160	return d_obtain_alias(jffs2_iget(child->d_inode->i_sb, pino));
	161	}
	162
ac4cfdd6	163	static const struct export_operations jffs2_export_ops = {
5f556aab DW	164	.get_parent = jffs2_get_parent,
	165	.fh_to_dentry = jffs2_fh_to_dentry,
	166	.fh_to_parent = jffs2_fh_to_parent,
	167	};
	168
92abc475 AS	169	/*
	170	* JFFS2 mount options.
	171	*
	172	* Opt_override_compr: override default compressor
	173	* Opt_err: just end of array marker
	174	*/
	175	enum {
	176	Opt_override_compr,
	177	Opt_err,
	178	};
	179
	180	static const match_table_t tokens = {
	181	{Opt_override_compr, "compr=%s"},
	182	{Opt_err, NULL},
	183	};
	184
	185	static int jffs2_parse_options(struct jffs2_sb_info c, char data)
	186	{
	187	substring_t args[MAX_OPT_ARGS];
	188	char p, name;
	189
	190	if (!data)
	191	return 0;
	192
	193	while ((p = strsep(&data, ","))) {
	194	int token;
	195
	196	if (!*p)
	197	continue;
	198
	199	token = match_token(p, tokens, args);
	200	switch (token) {
	201	case Opt_override_compr:
	202	name = match_strdup(&args[0]);
	203
	204	if (!name)
	205	return -ENOMEM;
123005f3	206	if (!strcmp(name, "none"))
92abc475	207	c->mount_opts.compr = JFFS2_COMPR_MODE_NONE;
123005f3 AS	208	#ifdef CONFIG_JFFS2_LZO
	209	else if (!strcmp(name, "lzo"))
	210	c->mount_opts.compr = JFFS2_COMPR_MODE_FORCELZO;
	211	#endif
	212	#ifdef CONFIG_JFFS2_ZLIB
	213	else if (!strcmp(name, "zlib"))
	214	c->mount_opts.compr =
	215	JFFS2_COMPR_MODE_FORCEZLIB;
	216	#endif
	217	else {
	218	printk(KERN_ERR "JFFS2 Error: unknown compressor \"%s\"",
	219	name);
	220	kfree(name);
	221	return -EINVAL;
92abc475 AS	222	}
92abc475 AS	223	kfree(name);
123005f3	224	c->mount_opts.override_compr = true;
92abc475 AS	225	break;
	226	default:
	227	printk(KERN_ERR "JFFS2 Error: unrecognized mount option '%s' or missing value\n",
	228	p);
	229	return -EINVAL;
	230	}
	231	}
	232
	233	return 0;
	234	}
	235
	236	static int jffs2_remount_fs(struct super_block sb, int flags, char *data)
	237	{
	238	struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
	239	int err;
	240
	241	err = jffs2_parse_options(c, data);
	242	if (err)
	243	return -EINVAL;
	244
	245	return jffs2_do_remount_fs(sb, flags, data);
	246	}
	247
ee9b6d61	248	static const struct super_operations jffs2_super_operations =
1da177e4 LT	249	{
	250	.alloc_inode = jffs2_alloc_inode,
	251	.destroy_inode =jffs2_destroy_inode,
1da177e4 LT	252	.put_super = jffs2_put_super,
	253	.write_super = jffs2_write_super,
	254	.statfs = jffs2_statfs,
	255	.remount_fs = jffs2_remount_fs,
b57922d9	256	.evict_inode = jffs2_evict_inode,
1da177e4	257	.dirty_inode = jffs2_dirty_inode,
92abc475	258	.show_options = jffs2_show_options,
1da177e4 LT	259	.sync_fs = jffs2_sync_fs,
	260	};
	261
acaebfd8 DH	262	/*
	263	* fill in the superblock
	264	*/
	265	static int jffs2_fill_super(struct super_block sb, void data, int silent)
1da177e4	266	{
1da177e4	267	struct jffs2_sb_info *c;
db719222 JB	268	int ret;
db719222 JB	269
acaebfd8 DH	270	D1(printk(KERN_DEBUG "jffs2_get_sb_mtd():"
	271	" New superblock for device %d (\"%s\")\n",
	272	sb->s_mtd->index, sb->s_mtd->name));
1da177e4	273
f8314dc6	274	c = kzalloc(sizeof(*c), GFP_KERNEL);
1a028dd2	275	if (!c)
454e2398	276	return -ENOMEM;
1da177e4	277
acaebfd8 DH	278	c->mtd = sb->s_mtd;
	279	c->os_priv = sb;
	280	sb->s_fs_info = c;
1da177e4	281
92abc475 AS	282	ret = jffs2_parse_options(c, data);
	283	if (ret) {
	284	kfree(c);
	285	return -EINVAL;
	286	}
	287
acaebfd8 DH	288	/* Initialize JFFS2 superblock locks, the further initialization will
acaebfd8 DH	289	* be done later */
ced22070 DW	290	mutex_init(&c->alloc_sem);
ced22070 DW	291	mutex_init(&c->erase_free_sem);
b6220598 AB	292	init_waitqueue_head(&c->erase_wait);
	293	init_waitqueue_head(&c->inocache_wq);
	294	spin_lock_init(&c->erase_completion_lock);
	295	spin_lock_init(&c->inocache_lock);
	296
1da177e4	297	sb->s_op = &jffs2_super_operations;
5f556aab	298	sb->s_export_op = &jffs2_export_ops;
acaebfd8	299	sb->s_flags = sb->s_flags \| MS_NOATIME;
aa98d7cf KK	300	sb->s_xattr = jffs2_xattr_handlers;
	301	#ifdef CONFIG_JFFS2_FS_POSIX_ACL
	302	sb->s_flags \|= MS_POSIXACL;
	303	#endif
db719222	304	ret = jffs2_do_fill_super(sb, data, silent);
db719222	305	return ret;
1da177e4 LT	306	}
1da177e4 LT	307
848b83a5	308	static struct dentry jffs2_mount(struct file_system_type fs_type,
454e2398	309	int flags, const char *dev_name,
848b83a5	310	void *data)
1da177e4	311	{
848b83a5	312	return mount_mtd(fs_type, flags, dev_name, data, jffs2_fill_super);
1da177e4 LT	313	}
	314
	315	static void jffs2_put_super (struct super_block *sb)
	316	{
	317	struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
	318
	319	D2(printk(KERN_DEBUG "jffs2: jffs2_put_super()\n"));
	320
8c85e125 CH	321	if (sb->s_dirt)
	322	jffs2_write_super(sb);
	323
ced22070	324	mutex_lock(&c->alloc_sem);
1da177e4	325	jffs2_flush_wbuf_pad(c);
ced22070	326	mutex_unlock(&c->alloc_sem);
e631ddba FH	327
	328	jffs2_sum_exit(c);
	329
1da177e4 LT	330	jffs2_free_ino_caches(c);
1da177e4 LT	331	jffs2_free_raw_node_refs(c);
4ce1f562	332	if (jffs2_blocks_use_vmalloc(c))
1da177e4 LT	333	vfree(c->blocks);
	334	else
	335	kfree(c->blocks);
	336	jffs2_flash_cleanup(c);
	337	kfree(c->inocache_list);
aa98d7cf	338	jffs2_clear_xattr_subsystem(c);
1da177e4 LT	339	if (c->mtd->sync)
	340	c->mtd->sync(c->mtd);
	341
	342	D1(printk(KERN_DEBUG "jffs2_put_super returning\n"));
	343	}
	344
	345	static void jffs2_kill_sb(struct super_block *sb)
	346	{
	347	struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
a69dde91 AB	348	if (!(sb->s_flags & MS_RDONLY))
a69dde91 AB	349	jffs2_stop_garbage_collect_thread(c);
acaebfd8	350	kill_mtd_super(sb);
1da177e4 LT	351	kfree(c);
	352	}
	353
	354	static struct file_system_type jffs2_fs_type = {
	355	.owner = THIS_MODULE,
	356	.name = "jffs2",
848b83a5	357	.mount = jffs2_mount,
1da177e4 LT	358	.kill_sb = jffs2_kill_sb,
	359	};
	360
	361	static int __init init_jffs2_fs(void)
	362	{
	363	int ret;
	364
3e68fbb5 DW	365	/* Paranoia checks for on-medium structures. If we ask GCC
	366	to pack them with __attribute__((packed)) then it _also_
	367	assumes that they're not aligned -- so it emits crappy
	368	code on some architectures. Ideally we want an attribute
	369	which means just 'no padding', without the alignment
	370	thing. But GCC doesn't have that -- we have to just
	371	hope the structs are the right sizes, instead. */
2ecd05ae AD	372	BUILD_BUG_ON(sizeof(struct jffs2_unknown_node) != 12);
	373	BUILD_BUG_ON(sizeof(struct jffs2_raw_dirent) != 40);
	374	BUILD_BUG_ON(sizeof(struct jffs2_raw_inode) != 68);
	375	BUILD_BUG_ON(sizeof(struct jffs2_raw_summary) != 32);
3e68fbb5	376
1da177e4	377	printk(KERN_INFO "JFFS2 version 2.2."
2f82ce1e	378	#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
1da177e4	379	" (NAND)"
e631ddba FH	380	#endif
	381	#ifdef CONFIG_JFFS2_SUMMARY
	382	" (SUMMARY) "
1da177e4	383	#endif
c00c310e	384	" © 2001-2006 Red Hat, Inc.\n");
1da177e4 LT	385
	386	jffs2_inode_cachep = kmem_cache_create("jffs2_i",
	387	sizeof(struct jffs2_inode_info),
fffb60f9 PJ	388	0, (SLAB_RECLAIM_ACCOUNT\|
fffb60f9 PJ	389	SLAB_MEM_SPREAD),
20c2df83	390	jffs2_i_init_once);
1da177e4 LT	391	if (!jffs2_inode_cachep) {
	392	printk(KERN_ERR "JFFS2 error: Failed to initialise inode cache\n");
	393	return -ENOMEM;
	394	}
	395	ret = jffs2_compressors_init();
	396	if (ret) {
	397	printk(KERN_ERR "JFFS2 error: Failed to initialise compressors\n");
	398	goto out;
	399	}
	400	ret = jffs2_create_slab_caches();
	401	if (ret) {
	402	printk(KERN_ERR "JFFS2 error: Failed to initialise slab caches\n");
	403	goto out_compressors;
	404	}
	405	ret = register_filesystem(&jffs2_fs_type);
	406	if (ret) {
	407	printk(KERN_ERR "JFFS2 error: Failed to register filesystem\n");
	408	goto out_slab;
	409	}
	410	return 0;
	411
	412	out_slab:
	413	jffs2_destroy_slab_caches();
	414	out_compressors:
	415	jffs2_compressors_exit();
	416	out:
	417	kmem_cache_destroy(jffs2_inode_cachep);
	418	return ret;
	419	}
	420
	421	static void __exit exit_jffs2_fs(void)
	422	{
	423	unregister_filesystem(&jffs2_fs_type);
	424	jffs2_destroy_slab_caches();
	425	jffs2_compressors_exit();
	426	kmem_cache_destroy(jffs2_inode_cachep);
	427	}
	428
	429	module_init(init_jffs2_fs);
	430	module_exit(exit_jffs2_fs);
	431
	432	MODULE_DESCRIPTION("The Journalling Flash File System, v2");
	433	MODULE_AUTHOR("Red Hat, Inc.");
182ec4ee	434	MODULE_LICENSE("GPL"); // Actually dual-licensed, but it doesn't matter for
1da177e4	435	// the sake of this tag. It's Free Software.