[deliverable/linux.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 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));
	if (opts->rp_size)
		seq_printf(s, ",rp_size=%u", opts->rp_size / 1024);

	return 0;
}

static int jffs2_sync_fs(struct super_block *sb, int wait)
{
	struct jffs2_sb_info *c = JFFS2_SB_INFO(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_rp_size: size of reserved pool in KiB
 * Opt_err: just end of array marker
 */
enum {
	Opt_override_compr,
	Opt_rp_size,
	Opt_err,
};

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

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

	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;
		case Opt_rp_size:
			if (match_int(&args[0], &opt))
				return -EINVAL;
			opt *= 1024;
			if (opt > c->mtd->size) {
				pr_warn("Too large reserve pool specified, max "
					"is %llu KB\n", c->mtd->size / 1024);
				return -EINVAL;
			}
			c->mount_opts.rp_size = opt;
			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,
	.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__);

	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();

	/*
	 * Make sure all delayed rcu free inodes are flushed before we
	 * destroy cache.
	 */
	rcu_barrier();
	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
92abc475 AS	66	static const char *jffs2_compr_name(unsigned int compr)
	67	{
	68	switch (compr) {
	69	case JFFS2_COMPR_MODE_NONE:
	70	return "none";
123005f3 AS	71	#ifdef CONFIG_JFFS2_LZO
	72	case JFFS2_COMPR_MODE_FORCELZO:
	73	return "lzo";
	74	#endif
	75	#ifdef CONFIG_JFFS2_ZLIB
	76	case JFFS2_COMPR_MODE_FORCEZLIB:
	77	return "zlib";
	78	#endif
92abc475 AS	79	default:
	80	/* should never happen; programmer error */
	81	WARN_ON(1);
	82	return "";
	83	}
	84	}
	85
34c80b1d	86	static int jffs2_show_options(struct seq_file s, struct dentry root)
92abc475	87	{
34c80b1d	88	struct jffs2_sb_info *c = JFFS2_SB_INFO(root->d_sb);
92abc475 AS	89	struct jffs2_mount_opts *opts = &c->mount_opts;
	90
	91	if (opts->override_compr)
	92	seq_printf(s, ",compr=%s", jffs2_compr_name(opts->compr));
8da8ba2e DD	93	if (opts->rp_size)
8da8ba2e DD	94	seq_printf(s, ",rp_size=%u", opts->rp_size / 1024);
92abc475 AS	95
	96	return 0;
	97	}
	98
1da177e4 LT	99	static int jffs2_sync_fs(struct super_block *sb, int wait)
	100	{
	101	struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
	102
ced22070	103	mutex_lock(&c->alloc_sem);
1da177e4	104	jffs2_flush_wbuf_pad(c);
ced22070	105	mutex_unlock(&c->alloc_sem);
1da177e4 LT	106	return 0;
	107	}
	108
5f556aab DW	109	static struct inode jffs2_nfs_get_inode(struct super_block sb, uint64_t ino,
	110	uint32_t generation)
	111	{
	112	/* We don't care about i_generation. We'll destroy the flash
	113	before we start re-using inode numbers anyway. And even
	114	if that wasn't true, we'd have other problems...*/
	115	return jffs2_iget(sb, ino);
	116	}
	117
	118	static struct dentry jffs2_fh_to_dentry(struct super_block sb, struct fid *fid,
	119	int fh_len, int fh_type)
	120	{
	121	return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
	122	jffs2_nfs_get_inode);
	123	}
	124
	125	static struct dentry jffs2_fh_to_parent(struct super_block sb, struct fid *fid,
	126	int fh_len, int fh_type)
	127	{
	128	return generic_fh_to_parent(sb, fid, fh_len, fh_type,
	129	jffs2_nfs_get_inode);
	130	}
	131
	132	static struct dentry jffs2_get_parent(struct dentry child)
	133	{
	134	struct jffs2_inode_info *f;
	135	uint32_t pino;
	136
	137	BUG_ON(!S_ISDIR(child->d_inode->i_mode));
	138
	139	f = JFFS2_INODE_INFO(child->d_inode);
	140
	141	pino = f->inocache->pino_nlink;
	142
	143	JFFS2_DEBUG("Parent of directory ino #%u is #%u\n",
	144	f->inocache->ino, pino);
	145
	146	return d_obtain_alias(jffs2_iget(child->d_inode->i_sb, pino));
	147	}
	148
ac4cfdd6	149	static const struct export_operations jffs2_export_ops = {
5f556aab DW	150	.get_parent = jffs2_get_parent,
	151	.fh_to_dentry = jffs2_fh_to_dentry,
	152	.fh_to_parent = jffs2_fh_to_parent,
	153	};
	154
92abc475 AS	155	/*
	156	* JFFS2 mount options.
	157	*
	158	* Opt_override_compr: override default compressor
8da8ba2e	159	* Opt_rp_size: size of reserved pool in KiB
92abc475 AS	160	* Opt_err: just end of array marker
	161	*/
	162	enum {
	163	Opt_override_compr,
8da8ba2e	164	Opt_rp_size,
92abc475 AS	165	Opt_err,
	166	};
	167
	168	static const match_table_t tokens = {
	169	{Opt_override_compr, "compr=%s"},
8da8ba2e	170	{Opt_rp_size, "rp_size=%u"},
92abc475 AS	171	{Opt_err, NULL},
	172	};
	173
	174	static int jffs2_parse_options(struct jffs2_sb_info c, char data)
	175	{
	176	substring_t args[MAX_OPT_ARGS];
	177	char p, name;
8da8ba2e	178	unsigned int opt;
92abc475 AS	179
	180	if (!data)
	181	return 0;
	182
	183	while ((p = strsep(&data, ","))) {
	184	int token;
	185
	186	if (!*p)
	187	continue;
	188
	189	token = match_token(p, tokens, args);
	190	switch (token) {
	191	case Opt_override_compr:
	192	name = match_strdup(&args[0]);
	193
	194	if (!name)
	195	return -ENOMEM;
123005f3	196	if (!strcmp(name, "none"))
92abc475	197	c->mount_opts.compr = JFFS2_COMPR_MODE_NONE;
123005f3 AS	198	#ifdef CONFIG_JFFS2_LZO
	199	else if (!strcmp(name, "lzo"))
	200	c->mount_opts.compr = JFFS2_COMPR_MODE_FORCELZO;
	201	#endif
	202	#ifdef CONFIG_JFFS2_ZLIB
	203	else if (!strcmp(name, "zlib"))
	204	c->mount_opts.compr =
	205	JFFS2_COMPR_MODE_FORCEZLIB;
	206	#endif
	207	else {
5a528957	208	pr_err("Error: unknown compressor \"%s\"\n",
da320f05	209	name);
123005f3 AS	210	kfree(name);
123005f3 AS	211	return -EINVAL;
92abc475 AS	212	}
92abc475 AS	213	kfree(name);
123005f3	214	c->mount_opts.override_compr = true;
92abc475	215	break;
8da8ba2e DD	216	case Opt_rp_size:
	217	if (match_int(&args[0], &opt))
	218	return -EINVAL;
	219	opt *= 1024;
	220	if (opt > c->mtd->size) {
	221	pr_warn("Too large reserve pool specified, max "
	222	"is %llu KB\n", c->mtd->size / 1024);
	223	return -EINVAL;
	224	}
	225	c->mount_opts.rp_size = opt;
	226	break;
92abc475	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	253	.put_super = jffs2_put_super,
1da177e4 LT	254	.statfs = jffs2_statfs,
1da177e4 LT	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
9c261b33	270	jffs2_dbg(1, "jffs2_get_sb_mtd():"
acaebfd8	271	" New superblock for device %d (\"%s\")\n",
9c261b33	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
9c261b33	319	jffs2_dbg(2, "%s()\n", __func__);
1da177e4	320
ced22070	321	mutex_lock(&c->alloc_sem);
1da177e4	322	jffs2_flush_wbuf_pad(c);
ced22070	323	mutex_unlock(&c->alloc_sem);
e631ddba FH	324
	325	jffs2_sum_exit(c);
	326
1da177e4 LT	327	jffs2_free_ino_caches(c);
1da177e4 LT	328	jffs2_free_raw_node_refs(c);
4ce1f562	329	if (jffs2_blocks_use_vmalloc(c))
1da177e4 LT	330	vfree(c->blocks);
	331	else
	332	kfree(c->blocks);
	333	jffs2_flash_cleanup(c);
	334	kfree(c->inocache_list);
aa98d7cf	335	jffs2_clear_xattr_subsystem(c);
327cf292	336	mtd_sync(c->mtd);
9c261b33	337	jffs2_dbg(1, "%s(): returning\n", __func__);
1da177e4 LT	338	}
	339
	340	static void jffs2_kill_sb(struct super_block *sb)
	341	{
	342	struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
a69dde91 AB	343	if (!(sb->s_flags & MS_RDONLY))
a69dde91 AB	344	jffs2_stop_garbage_collect_thread(c);
acaebfd8	345	kill_mtd_super(sb);
1da177e4 LT	346	kfree(c);
	347	}
	348
	349	static struct file_system_type jffs2_fs_type = {
	350	.owner = THIS_MODULE,
	351	.name = "jffs2",
848b83a5	352	.mount = jffs2_mount,
1da177e4 LT	353	.kill_sb = jffs2_kill_sb,
	354	};
	355
	356	static int __init init_jffs2_fs(void)
	357	{
	358	int ret;
	359
3e68fbb5 DW	360	/* Paranoia checks for on-medium structures. If we ask GCC
	361	to pack them with __attribute__((packed)) then it _also_
	362	assumes that they're not aligned -- so it emits crappy
	363	code on some architectures. Ideally we want an attribute
	364	which means just 'no padding', without the alignment
	365	thing. But GCC doesn't have that -- we have to just
	366	hope the structs are the right sizes, instead. */
2ecd05ae AD	367	BUILD_BUG_ON(sizeof(struct jffs2_unknown_node) != 12);
	368	BUILD_BUG_ON(sizeof(struct jffs2_raw_dirent) != 40);
	369	BUILD_BUG_ON(sizeof(struct jffs2_raw_inode) != 68);
	370	BUILD_BUG_ON(sizeof(struct jffs2_raw_summary) != 32);
3e68fbb5	371
5a528957	372	pr_info("version 2.2."
2f82ce1e	373	#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
1da177e4	374	" (NAND)"
e631ddba FH	375	#endif
	376	#ifdef CONFIG_JFFS2_SUMMARY
	377	" (SUMMARY) "
1da177e4	378	#endif
c00c310e	379	" © 2001-2006 Red Hat, Inc.\n");
1da177e4 LT	380
	381	jffs2_inode_cachep = kmem_cache_create("jffs2_i",
	382	sizeof(struct jffs2_inode_info),
fffb60f9 PJ	383	0, (SLAB_RECLAIM_ACCOUNT\|
fffb60f9 PJ	384	SLAB_MEM_SPREAD),
20c2df83	385	jffs2_i_init_once);
1da177e4	386	if (!jffs2_inode_cachep) {
5a528957	387	pr_err("error: Failed to initialise inode cache\n");
1da177e4 LT	388	return -ENOMEM;
	389	}
	390	ret = jffs2_compressors_init();
	391	if (ret) {
5a528957	392	pr_err("error: Failed to initialise compressors\n");
1da177e4 LT	393	goto out;
	394	}
	395	ret = jffs2_create_slab_caches();
	396	if (ret) {
5a528957	397	pr_err("error: Failed to initialise slab caches\n");
1da177e4 LT	398	goto out_compressors;
	399	}
	400	ret = register_filesystem(&jffs2_fs_type);
	401	if (ret) {
5a528957	402	pr_err("error: Failed to register filesystem\n");
1da177e4 LT	403	goto out_slab;
	404	}
	405	return 0;
	406
	407	out_slab:
	408	jffs2_destroy_slab_caches();
	409	out_compressors:
	410	jffs2_compressors_exit();
	411	out:
	412	kmem_cache_destroy(jffs2_inode_cachep);
	413	return ret;
	414	}
	415
	416	static void __exit exit_jffs2_fs(void)
	417	{
	418	unregister_filesystem(&jffs2_fs_type);
	419	jffs2_destroy_slab_caches();
	420	jffs2_compressors_exit();
8c0a8537 KS	421
	422	/*
	423	* Make sure all delayed rcu free inodes are flushed before we
	424	* destroy cache.
	425	*/
	426	rcu_barrier();
1da177e4 LT	427	kmem_cache_destroy(jffs2_inode_cachep);
	428	}
	429
	430	module_init(init_jffs2_fs);
	431	module_exit(exit_jffs2_fs);
	432
	433	MODULE_DESCRIPTION("The Journalling Flash File System, v2");
	434	MODULE_AUTHOR("Red Hat, Inc.");
182ec4ee	435	MODULE_LICENSE("GPL"); // Actually dual-licensed, but it doesn't matter for
1da177e4	436	// the sake of this tag. It's Free Software.