[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/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 {
				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;

	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);

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