[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.
 *
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#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);
	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)) {
		jffs2_dbg(1, "%s()\n", __func__);
		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 dentry *root)
{
	struct jffs2_sb_info *c = JFFS2_SB_INFO(root->d_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 {
				pr_err("Error: unknown compressor \"%s\"\n",
				       name);
				kfree(name);
				return -EINVAL;
			}
			kfree(name);
			c->mount_opts.override_compr = true;
			break;
		default:
			pr_err("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;

	jffs2_dbg(1, "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);

	jffs2_dbg(2, "%s()\n", __func__);

	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);
	mtd_sync(c->mtd);
	jffs2_dbg(1, "%s(): returning\n", __func__);
}

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);

	pr_info("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) {
		pr_err("error: Failed to initialise inode cache\n");
		return -ENOMEM;
	}
	ret = jffs2_compressors_init();
	if (ret) {
		pr_err("error: Failed to initialise compressors\n");
		goto out;
	}
	ret = jffs2_create_slab_caches();
	if (ret) {
		pr_err("error: Failed to initialise slab caches\n");
		goto out_compressors;
	}
	ret = register_filesystem(&jffs2_fs_type);
	if (ret) {
		pr_err("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
5a528957 JP	12	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
5a528957 JP	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>
9c74034f	20	#include <linux/err.h>
1da177e4	21	#include <linux/mount.h>
92abc475	22	#include <linux/parser.h>
1da177e4 LT	23	#include <linux/jffs2.h>
1da177e4 LT	24	#include <linux/pagemap.h>
acaebfd8	25	#include <linux/mtd/super.h>
1da177e4 LT	26	#include <linux/ctype.h>
1da177e4 LT	27	#include <linux/namei.h>
92abc475	28	#include <linux/seq_file.h>
5f556aab	29	#include <linux/exportfs.h>
1da177e4 LT	30	#include "compr.h"
	31	#include "nodelist.h"
	32
	33	static void jffs2_put_super(struct super_block *);
	34
e18b890b	35	static struct kmem_cache *jffs2_inode_cachep;
1da177e4 LT	36
	37	static struct inode jffs2_alloc_inode(struct super_block sb)
	38	{
4e571aba DW	39	struct jffs2_inode_info *f;
	40
	41	f = kmem_cache_alloc(jffs2_inode_cachep, GFP_KERNEL);
	42	if (!f)
1da177e4	43	return NULL;
4e571aba	44	return &f->vfs_inode;
1da177e4 LT	45	}
1da177e4 LT	46
fa0d7e3d	47	static void jffs2_i_callback(struct rcu_head *head)
1da177e4	48	{
fa0d7e3d	49	struct inode *inode = container_of(head, struct inode, i_rcu);
1da177e4 LT	50	kmem_cache_free(jffs2_inode_cachep, JFFS2_INODE_INFO(inode));
	51	}
	52
fa0d7e3d NP	53	static void jffs2_destroy_inode(struct inode *inode)
	54	{
	55	call_rcu(&inode->i_rcu, jffs2_i_callback);
	56	}
	57
51cc5068	58	static void jffs2_i_init_once(void *foo)
1da177e4	59	{
4e571aba	60	struct jffs2_inode_info *f = foo;
1da177e4	61
4e571aba DW	62	mutex_init(&f->sem);
4e571aba DW	63	inode_init_once(&f->vfs_inode);
1da177e4 LT	64	}
1da177e4 LT	65
01ba6875 CH	66	static void jffs2_write_super(struct super_block *sb)
	67	{
	68	struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
ebc1ac16 CH	69
ebc1ac16 CH	70	lock_super(sb);
01ba6875 CH	71	sb->s_dirt = 0;
01ba6875 CH	72
ebc1ac16	73	if (!(sb->s_flags & MS_RDONLY)) {
9c261b33	74	jffs2_dbg(1, "%s()\n", __func__);
ebc1ac16 CH	75	jffs2_flush_wbuf_gc(c, 0);
ebc1ac16 CH	76	}
01ba6875	77
ebc1ac16	78	unlock_super(sb);
01ba6875 CH	79	}
01ba6875 CH	80
92abc475 AS	81	static const char *jffs2_compr_name(unsigned int compr)
	82	{
	83	switch (compr) {
	84	case JFFS2_COMPR_MODE_NONE:
	85	return "none";
123005f3 AS	86	#ifdef CONFIG_JFFS2_LZO
	87	case JFFS2_COMPR_MODE_FORCELZO:
	88	return "lzo";
	89	#endif
	90	#ifdef CONFIG_JFFS2_ZLIB
	91	case JFFS2_COMPR_MODE_FORCEZLIB:
	92	return "zlib";
	93	#endif
92abc475 AS	94	default:
	95	/* should never happen; programmer error */
	96	WARN_ON(1);
	97	return "";
	98	}
	99	}
	100
34c80b1d	101	static int jffs2_show_options(struct seq_file s, struct dentry root)
92abc475	102	{
34c80b1d	103	struct jffs2_sb_info *c = JFFS2_SB_INFO(root->d_sb);
92abc475 AS	104	struct jffs2_mount_opts *opts = &c->mount_opts;
	105
	106	if (opts->override_compr)
	107	seq_printf(s, ",compr=%s", jffs2_compr_name(opts->compr));
	108
	109	return 0;
	110	}
	111
1da177e4 LT	112	static int jffs2_sync_fs(struct super_block *sb, int wait)
	113	{
	114	struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
	115
d579ed00 CH	116	jffs2_write_super(sb);
d579ed00 CH	117
ced22070	118	mutex_lock(&c->alloc_sem);
1da177e4	119	jffs2_flush_wbuf_pad(c);
ced22070	120	mutex_unlock(&c->alloc_sem);
1da177e4 LT	121	return 0;
	122	}
	123
5f556aab DW	124	static struct inode jffs2_nfs_get_inode(struct super_block sb, uint64_t ino,
	125	uint32_t generation)
	126	{
	127	/* We don't care about i_generation. We'll destroy the flash
	128	before we start re-using inode numbers anyway. And even
	129	if that wasn't true, we'd have other problems...*/
	130	return jffs2_iget(sb, ino);
	131	}
	132
	133	static struct dentry jffs2_fh_to_dentry(struct super_block sb, struct fid *fid,
	134	int fh_len, int fh_type)
	135	{
	136	return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
	137	jffs2_nfs_get_inode);
	138	}
	139
	140	static struct dentry jffs2_fh_to_parent(struct super_block sb, struct fid *fid,
	141	int fh_len, int fh_type)
	142	{
	143	return generic_fh_to_parent(sb, fid, fh_len, fh_type,
	144	jffs2_nfs_get_inode);
	145	}
	146
	147	static struct dentry jffs2_get_parent(struct dentry child)
	148	{
	149	struct jffs2_inode_info *f;
	150	uint32_t pino;
	151
	152	BUG_ON(!S_ISDIR(child->d_inode->i_mode));
	153
	154	f = JFFS2_INODE_INFO(child->d_inode);
	155
	156	pino = f->inocache->pino_nlink;
	157
	158	JFFS2_DEBUG("Parent of directory ino #%u is #%u\n",
	159	f->inocache->ino, pino);
	160
	161	return d_obtain_alias(jffs2_iget(child->d_inode->i_sb, pino));
	162	}
	163
ac4cfdd6	164	static const struct export_operations jffs2_export_ops = {
5f556aab DW	165	.get_parent = jffs2_get_parent,
	166	.fh_to_dentry = jffs2_fh_to_dentry,
	167	.fh_to_parent = jffs2_fh_to_parent,
	168	};
	169
92abc475 AS	170	/*
	171	* JFFS2 mount options.
	172	*
	173	* Opt_override_compr: override default compressor
	174	* Opt_err: just end of array marker
	175	*/
	176	enum {
	177	Opt_override_compr,
	178	Opt_err,
	179	};
	180
	181	static const match_table_t tokens = {
	182	{Opt_override_compr, "compr=%s"},
	183	{Opt_err, NULL},
	184	};
	185
	186	static int jffs2_parse_options(struct jffs2_sb_info c, char data)
	187	{
	188	substring_t args[MAX_OPT_ARGS];
	189	char p, name;
	190
	191	if (!data)
	192	return 0;
	193
	194	while ((p = strsep(&data, ","))) {
	195	int token;
	196
	197	if (!*p)
	198	continue;
	199
	200	token = match_token(p, tokens, args);
	201	switch (token) {
	202	case Opt_override_compr:
	203	name = match_strdup(&args[0]);
	204
	205	if (!name)
	206	return -ENOMEM;
123005f3	207	if (!strcmp(name, "none"))
92abc475	208	c->mount_opts.compr = JFFS2_COMPR_MODE_NONE;
123005f3 AS	209	#ifdef CONFIG_JFFS2_LZO
	210	else if (!strcmp(name, "lzo"))
	211	c->mount_opts.compr = JFFS2_COMPR_MODE_FORCELZO;
	212	#endif
	213	#ifdef CONFIG_JFFS2_ZLIB
	214	else if (!strcmp(name, "zlib"))
	215	c->mount_opts.compr =
	216	JFFS2_COMPR_MODE_FORCEZLIB;
	217	#endif
	218	else {
5a528957	219	pr_err("Error: unknown compressor \"%s\"\n",
da320f05	220	name);
123005f3 AS	221	kfree(name);
123005f3 AS	222	return -EINVAL;
92abc475 AS	223	}
92abc475 AS	224	kfree(name);
123005f3	225	c->mount_opts.override_compr = true;
92abc475 AS	226	break;
92abc475 AS	227	default:
5a528957	228	pr_err("Error: unrecognized mount option '%s' or missing value\n",
da320f05	229	p);
92abc475 AS	230	return -EINVAL;
	231	}
	232	}
	233
	234	return 0;
	235	}
	236
	237	static int jffs2_remount_fs(struct super_block sb, int flags, char *data)
	238	{
	239	struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
	240	int err;
	241
	242	err = jffs2_parse_options(c, data);
	243	if (err)
	244	return -EINVAL;
	245
	246	return jffs2_do_remount_fs(sb, flags, data);
	247	}
	248
ee9b6d61	249	static const struct super_operations jffs2_super_operations =
1da177e4 LT	250	{
	251	.alloc_inode = jffs2_alloc_inode,
	252	.destroy_inode =jffs2_destroy_inode,
1da177e4 LT	253	.put_super = jffs2_put_super,
	254	.write_super = jffs2_write_super,
	255	.statfs = jffs2_statfs,
	256	.remount_fs = jffs2_remount_fs,
b57922d9	257	.evict_inode = jffs2_evict_inode,
1da177e4	258	.dirty_inode = jffs2_dirty_inode,
92abc475	259	.show_options = jffs2_show_options,
1da177e4 LT	260	.sync_fs = jffs2_sync_fs,
	261	};
	262
acaebfd8 DH	263	/*
	264	* fill in the superblock
	265	*/
	266	static int jffs2_fill_super(struct super_block sb, void data, int silent)
1da177e4	267	{
1da177e4	268	struct jffs2_sb_info *c;
db719222 JB	269	int ret;
db719222 JB	270
9c261b33	271	jffs2_dbg(1, "jffs2_get_sb_mtd():"
acaebfd8	272	" New superblock for device %d (\"%s\")\n",
9c261b33	273	sb->s_mtd->index, sb->s_mtd->name);
1da177e4	274
f8314dc6	275	c = kzalloc(sizeof(*c), GFP_KERNEL);
1a028dd2	276	if (!c)
454e2398	277	return -ENOMEM;
1da177e4	278
acaebfd8 DH	279	c->mtd = sb->s_mtd;
	280	c->os_priv = sb;
	281	sb->s_fs_info = c;
1da177e4	282
92abc475 AS	283	ret = jffs2_parse_options(c, data);
	284	if (ret) {
	285	kfree(c);
	286	return -EINVAL;
	287	}
	288
acaebfd8 DH	289	/* Initialize JFFS2 superblock locks, the further initialization will
acaebfd8 DH	290	* be done later */
ced22070 DW	291	mutex_init(&c->alloc_sem);
ced22070 DW	292	mutex_init(&c->erase_free_sem);
b6220598 AB	293	init_waitqueue_head(&c->erase_wait);
	294	init_waitqueue_head(&c->inocache_wq);
	295	spin_lock_init(&c->erase_completion_lock);
	296	spin_lock_init(&c->inocache_lock);
	297
1da177e4	298	sb->s_op = &jffs2_super_operations;
5f556aab	299	sb->s_export_op = &jffs2_export_ops;
acaebfd8	300	sb->s_flags = sb->s_flags \| MS_NOATIME;
aa98d7cf KK	301	sb->s_xattr = jffs2_xattr_handlers;
	302	#ifdef CONFIG_JFFS2_FS_POSIX_ACL
	303	sb->s_flags \|= MS_POSIXACL;
	304	#endif
db719222	305	ret = jffs2_do_fill_super(sb, data, silent);
db719222	306	return ret;
1da177e4 LT	307	}
1da177e4 LT	308
848b83a5	309	static struct dentry jffs2_mount(struct file_system_type fs_type,
454e2398	310	int flags, const char *dev_name,
848b83a5	311	void *data)
1da177e4	312	{
848b83a5	313	return mount_mtd(fs_type, flags, dev_name, data, jffs2_fill_super);
1da177e4 LT	314	}
	315
	316	static void jffs2_put_super (struct super_block *sb)
	317	{
	318	struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
	319
9c261b33	320	jffs2_dbg(2, "%s()\n", __func__);
1da177e4	321
8c85e125 CH	322	if (sb->s_dirt)
	323	jffs2_write_super(sb);
	324
ced22070	325	mutex_lock(&c->alloc_sem);
1da177e4	326	jffs2_flush_wbuf_pad(c);
ced22070	327	mutex_unlock(&c->alloc_sem);
e631ddba FH	328
	329	jffs2_sum_exit(c);
	330
1da177e4 LT	331	jffs2_free_ino_caches(c);
1da177e4 LT	332	jffs2_free_raw_node_refs(c);
4ce1f562	333	if (jffs2_blocks_use_vmalloc(c))
1da177e4 LT	334	vfree(c->blocks);
	335	else
	336	kfree(c->blocks);
	337	jffs2_flash_cleanup(c);
	338	kfree(c->inocache_list);
aa98d7cf	339	jffs2_clear_xattr_subsystem(c);
327cf292	340	mtd_sync(c->mtd);
9c261b33	341	jffs2_dbg(1, "%s(): returning\n", __func__);
1da177e4 LT	342	}
	343
	344	static void jffs2_kill_sb(struct super_block *sb)
	345	{
	346	struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
a69dde91 AB	347	if (!(sb->s_flags & MS_RDONLY))
a69dde91 AB	348	jffs2_stop_garbage_collect_thread(c);
acaebfd8	349	kill_mtd_super(sb);
1da177e4 LT	350	kfree(c);
	351	}
	352
	353	static struct file_system_type jffs2_fs_type = {
	354	.owner = THIS_MODULE,
	355	.name = "jffs2",
848b83a5	356	.mount = jffs2_mount,
1da177e4 LT	357	.kill_sb = jffs2_kill_sb,
	358	};
	359
	360	static int __init init_jffs2_fs(void)
	361	{
	362	int ret;
	363
3e68fbb5 DW	364	/* Paranoia checks for on-medium structures. If we ask GCC
	365	to pack them with __attribute__((packed)) then it _also_
	366	assumes that they're not aligned -- so it emits crappy
	367	code on some architectures. Ideally we want an attribute
	368	which means just 'no padding', without the alignment
	369	thing. But GCC doesn't have that -- we have to just
	370	hope the structs are the right sizes, instead. */
2ecd05ae AD	371	BUILD_BUG_ON(sizeof(struct jffs2_unknown_node) != 12);
	372	BUILD_BUG_ON(sizeof(struct jffs2_raw_dirent) != 40);
	373	BUILD_BUG_ON(sizeof(struct jffs2_raw_inode) != 68);
	374	BUILD_BUG_ON(sizeof(struct jffs2_raw_summary) != 32);
3e68fbb5	375
5a528957	376	pr_info("version 2.2."
2f82ce1e	377	#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
1da177e4	378	" (NAND)"
e631ddba FH	379	#endif
	380	#ifdef CONFIG_JFFS2_SUMMARY
	381	" (SUMMARY) "
1da177e4	382	#endif
c00c310e	383	" © 2001-2006 Red Hat, Inc.\n");
1da177e4 LT	384
	385	jffs2_inode_cachep = kmem_cache_create("jffs2_i",
	386	sizeof(struct jffs2_inode_info),
fffb60f9 PJ	387	0, (SLAB_RECLAIM_ACCOUNT\|
fffb60f9 PJ	388	SLAB_MEM_SPREAD),
20c2df83	389	jffs2_i_init_once);
1da177e4	390	if (!jffs2_inode_cachep) {
5a528957	391	pr_err("error: Failed to initialise inode cache\n");
1da177e4 LT	392	return -ENOMEM;
	393	}
	394	ret = jffs2_compressors_init();
	395	if (ret) {
5a528957	396	pr_err("error: Failed to initialise compressors\n");
1da177e4 LT	397	goto out;
	398	}
	399	ret = jffs2_create_slab_caches();
	400	if (ret) {
5a528957	401	pr_err("error: Failed to initialise slab caches\n");
1da177e4 LT	402	goto out_compressors;
	403	}
	404	ret = register_filesystem(&jffs2_fs_type);
	405	if (ret) {
5a528957	406	pr_err("error: Failed to register filesystem\n");
1da177e4 LT	407	goto out_slab;
	408	}
	409	return 0;
	410
	411	out_slab:
	412	jffs2_destroy_slab_caches();
	413	out_compressors:
	414	jffs2_compressors_exit();
	415	out:
	416	kmem_cache_destroy(jffs2_inode_cachep);
	417	return ret;
	418	}
	419
	420	static void __exit exit_jffs2_fs(void)
	421	{
	422	unregister_filesystem(&jffs2_fs_type);
	423	jffs2_destroy_slab_caches();
	424	jffs2_compressors_exit();
	425	kmem_cache_destroy(jffs2_inode_cachep);
	426	}
	427
	428	module_init(init_jffs2_fs);
	429	module_exit(exit_jffs2_fs);
	430
	431	MODULE_DESCRIPTION("The Journalling Flash File System, v2");
	432	MODULE_AUTHOR("Red Hat, Inc.");
182ec4ee	433	MODULE_LICENSE("GPL"); // Actually dual-licensed, but it doesn't matter for
1da177e4	434	// the sake of this tag. It's Free Software.