[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 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);

#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
	cancel_delayed_work_sync(&c->wbuf_dwork);
#endif

	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(!d_is_dir(child));

	f = JFFS2_INODE_INFO(d_inode(child));

	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(d_inode(child)->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;

	sync_filesystem(sb);
	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,
};
MODULE_ALIAS_FS("jffs2");

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
a445f784 AB	103	#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
	104	cancel_delayed_work_sync(&c->wbuf_dwork);
	105	#endif
	106
ced22070	107	mutex_lock(&c->alloc_sem);
1da177e4	108	jffs2_flush_wbuf_pad(c);
ced22070	109	mutex_unlock(&c->alloc_sem);
1da177e4 LT	110	return 0;
	111	}
	112
5f556aab DW	113	static struct inode jffs2_nfs_get_inode(struct super_block sb, uint64_t ino,
	114	uint32_t generation)
	115	{
	116	/* We don't care about i_generation. We'll destroy the flash
	117	before we start re-using inode numbers anyway. And even
	118	if that wasn't true, we'd have other problems...*/
	119	return jffs2_iget(sb, ino);
	120	}
	121
	122	static struct dentry jffs2_fh_to_dentry(struct super_block sb, struct fid *fid,
	123	int fh_len, int fh_type)
	124	{
	125	return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
	126	jffs2_nfs_get_inode);
	127	}
	128
	129	static struct dentry jffs2_fh_to_parent(struct super_block sb, struct fid *fid,
	130	int fh_len, int fh_type)
	131	{
	132	return generic_fh_to_parent(sb, fid, fh_len, fh_type,
	133	jffs2_nfs_get_inode);
	134	}
	135
	136	static struct dentry jffs2_get_parent(struct dentry child)
	137	{
	138	struct jffs2_inode_info *f;
	139	uint32_t pino;
	140
e36cb0b8	141	BUG_ON(!d_is_dir(child));
5f556aab	142
2b0143b5	143	f = JFFS2_INODE_INFO(d_inode(child));
5f556aab DW	144
	145	pino = f->inocache->pino_nlink;
	146
	147	JFFS2_DEBUG("Parent of directory ino #%u is #%u\n",
	148	f->inocache->ino, pino);
	149
2b0143b5	150	return d_obtain_alias(jffs2_iget(d_inode(child)->i_sb, pino));
5f556aab DW	151	}
5f556aab DW	152
ac4cfdd6	153	static const struct export_operations jffs2_export_ops = {
5f556aab DW	154	.get_parent = jffs2_get_parent,
	155	.fh_to_dentry = jffs2_fh_to_dentry,
	156	.fh_to_parent = jffs2_fh_to_parent,
	157	};
	158
92abc475 AS	159	/*
	160	* JFFS2 mount options.
	161	*
	162	* Opt_override_compr: override default compressor
8da8ba2e	163	* Opt_rp_size: size of reserved pool in KiB
92abc475 AS	164	* Opt_err: just end of array marker
	165	*/
	166	enum {
	167	Opt_override_compr,
8da8ba2e	168	Opt_rp_size,
92abc475 AS	169	Opt_err,
	170	};
	171
	172	static const match_table_t tokens = {
	173	{Opt_override_compr, "compr=%s"},
8da8ba2e	174	{Opt_rp_size, "rp_size=%u"},
92abc475 AS	175	{Opt_err, NULL},
	176	};
	177
	178	static int jffs2_parse_options(struct jffs2_sb_info c, char data)
	179	{
	180	substring_t args[MAX_OPT_ARGS];
	181	char p, name;
8da8ba2e	182	unsigned int opt;
92abc475 AS	183
	184	if (!data)
	185	return 0;
	186
	187	while ((p = strsep(&data, ","))) {
	188	int token;
	189
	190	if (!*p)
	191	continue;
	192
	193	token = match_token(p, tokens, args);
	194	switch (token) {
	195	case Opt_override_compr:
	196	name = match_strdup(&args[0]);
	197
	198	if (!name)
	199	return -ENOMEM;
123005f3	200	if (!strcmp(name, "none"))
92abc475	201	c->mount_opts.compr = JFFS2_COMPR_MODE_NONE;
123005f3 AS	202	#ifdef CONFIG_JFFS2_LZO
	203	else if (!strcmp(name, "lzo"))
	204	c->mount_opts.compr = JFFS2_COMPR_MODE_FORCELZO;
	205	#endif
	206	#ifdef CONFIG_JFFS2_ZLIB
	207	else if (!strcmp(name, "zlib"))
	208	c->mount_opts.compr =
	209	JFFS2_COMPR_MODE_FORCEZLIB;
	210	#endif
	211	else {
5a528957	212	pr_err("Error: unknown compressor \"%s\"\n",
da320f05	213	name);
123005f3 AS	214	kfree(name);
123005f3 AS	215	return -EINVAL;
92abc475 AS	216	}
92abc475 AS	217	kfree(name);
123005f3	218	c->mount_opts.override_compr = true;
92abc475	219	break;
8da8ba2e DD	220	case Opt_rp_size:
	221	if (match_int(&args[0], &opt))
	222	return -EINVAL;
	223	opt *= 1024;
	224	if (opt > c->mtd->size) {
	225	pr_warn("Too large reserve pool specified, max "
	226	"is %llu KB\n", c->mtd->size / 1024);
	227	return -EINVAL;
	228	}
	229	c->mount_opts.rp_size = opt;
	230	break;
92abc475	231	default:
5a528957	232	pr_err("Error: unrecognized mount option '%s' or missing value\n",
da320f05	233	p);
92abc475 AS	234	return -EINVAL;
	235	}
	236	}
	237
	238	return 0;
	239	}
	240
	241	static int jffs2_remount_fs(struct super_block sb, int flags, char *data)
	242	{
	243	struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
	244	int err;
	245
02b9984d	246	sync_filesystem(sb);
92abc475 AS	247	err = jffs2_parse_options(c, data);
	248	if (err)
	249	return -EINVAL;
	250
	251	return jffs2_do_remount_fs(sb, flags, data);
	252	}
	253
ee9b6d61	254	static const struct super_operations jffs2_super_operations =
1da177e4 LT	255	{
	256	.alloc_inode = jffs2_alloc_inode,
	257	.destroy_inode =jffs2_destroy_inode,
1da177e4	258	.put_super = jffs2_put_super,
1da177e4 LT	259	.statfs = jffs2_statfs,
1da177e4 LT	260	.remount_fs = jffs2_remount_fs,
b57922d9	261	.evict_inode = jffs2_evict_inode,
1da177e4	262	.dirty_inode = jffs2_dirty_inode,
92abc475	263	.show_options = jffs2_show_options,
1da177e4 LT	264	.sync_fs = jffs2_sync_fs,
	265	};
	266
acaebfd8 DH	267	/*
	268	* fill in the superblock
	269	*/
	270	static int jffs2_fill_super(struct super_block sb, void data, int silent)
1da177e4	271	{
1da177e4	272	struct jffs2_sb_info *c;
db719222 JB	273	int ret;
db719222 JB	274
9c261b33	275	jffs2_dbg(1, "jffs2_get_sb_mtd():"
acaebfd8	276	" New superblock for device %d (\"%s\")\n",
9c261b33	277	sb->s_mtd->index, sb->s_mtd->name);
1da177e4	278
f8314dc6	279	c = kzalloc(sizeof(*c), GFP_KERNEL);
1a028dd2	280	if (!c)
454e2398	281	return -ENOMEM;
1da177e4	282
acaebfd8 DH	283	c->mtd = sb->s_mtd;
	284	c->os_priv = sb;
	285	sb->s_fs_info = c;
1da177e4	286
92abc475 AS	287	ret = jffs2_parse_options(c, data);
	288	if (ret) {
	289	kfree(c);
	290	return -EINVAL;
	291	}
	292
acaebfd8 DH	293	/* Initialize JFFS2 superblock locks, the further initialization will
acaebfd8 DH	294	* be done later */
ced22070 DW	295	mutex_init(&c->alloc_sem);
ced22070 DW	296	mutex_init(&c->erase_free_sem);
b6220598 AB	297	init_waitqueue_head(&c->erase_wait);
	298	init_waitqueue_head(&c->inocache_wq);
	299	spin_lock_init(&c->erase_completion_lock);
	300	spin_lock_init(&c->inocache_lock);
	301
1da177e4	302	sb->s_op = &jffs2_super_operations;
5f556aab	303	sb->s_export_op = &jffs2_export_ops;
acaebfd8	304	sb->s_flags = sb->s_flags \| MS_NOATIME;
aa98d7cf KK	305	sb->s_xattr = jffs2_xattr_handlers;
	306	#ifdef CONFIG_JFFS2_FS_POSIX_ACL
	307	sb->s_flags \|= MS_POSIXACL;
	308	#endif
db719222	309	ret = jffs2_do_fill_super(sb, data, silent);
db719222	310	return ret;
1da177e4 LT	311	}
1da177e4 LT	312
848b83a5	313	static struct dentry jffs2_mount(struct file_system_type fs_type,
454e2398	314	int flags, const char *dev_name,
848b83a5	315	void *data)
1da177e4	316	{
848b83a5	317	return mount_mtd(fs_type, flags, dev_name, data, jffs2_fill_super);
1da177e4 LT	318	}
	319
	320	static void jffs2_put_super (struct super_block *sb)
	321	{
	322	struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
	323
9c261b33	324	jffs2_dbg(2, "%s()\n", __func__);
1da177e4	325
ced22070	326	mutex_lock(&c->alloc_sem);
1da177e4	327	jffs2_flush_wbuf_pad(c);
ced22070	328	mutex_unlock(&c->alloc_sem);
e631ddba FH	329
	330	jffs2_sum_exit(c);
	331
1da177e4 LT	332	jffs2_free_ino_caches(c);
1da177e4 LT	333	jffs2_free_raw_node_refs(c);
4ce1f562	334	if (jffs2_blocks_use_vmalloc(c))
1da177e4 LT	335	vfree(c->blocks);
	336	else
	337	kfree(c->blocks);
	338	jffs2_flash_cleanup(c);
	339	kfree(c->inocache_list);
aa98d7cf	340	jffs2_clear_xattr_subsystem(c);
327cf292	341	mtd_sync(c->mtd);
9c261b33	342	jffs2_dbg(1, "%s(): returning\n", __func__);
1da177e4 LT	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,
1da177e4 LT	359	};
7f78e035	360	MODULE_ALIAS_FS("jffs2");
1da177e4 LT	361
	362	static int __init init_jffs2_fs(void)
	363	{
	364	int ret;
	365
3e68fbb5 DW	366	/* Paranoia checks for on-medium structures. If we ask GCC
	367	to pack them with __attribute__((packed)) then it _also_
	368	assumes that they're not aligned -- so it emits crappy
	369	code on some architectures. Ideally we want an attribute
	370	which means just 'no padding', without the alignment
	371	thing. But GCC doesn't have that -- we have to just
	372	hope the structs are the right sizes, instead. */
2ecd05ae AD	373	BUILD_BUG_ON(sizeof(struct jffs2_unknown_node) != 12);
	374	BUILD_BUG_ON(sizeof(struct jffs2_raw_dirent) != 40);
	375	BUILD_BUG_ON(sizeof(struct jffs2_raw_inode) != 68);
	376	BUILD_BUG_ON(sizeof(struct jffs2_raw_summary) != 32);
3e68fbb5	377
5a528957	378	pr_info("version 2.2."
2f82ce1e	379	#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
1da177e4	380	" (NAND)"
e631ddba FH	381	#endif
	382	#ifdef CONFIG_JFFS2_SUMMARY
	383	" (SUMMARY) "
1da177e4	384	#endif
c00c310e	385	" © 2001-2006 Red Hat, Inc.\n");
1da177e4 LT	386
	387	jffs2_inode_cachep = kmem_cache_create("jffs2_i",
	388	sizeof(struct jffs2_inode_info),
fffb60f9 PJ	389	0, (SLAB_RECLAIM_ACCOUNT\|
fffb60f9 PJ	390	SLAB_MEM_SPREAD),
20c2df83	391	jffs2_i_init_once);
1da177e4	392	if (!jffs2_inode_cachep) {
5a528957	393	pr_err("error: Failed to initialise inode cache\n");
1da177e4 LT	394	return -ENOMEM;
	395	}
	396	ret = jffs2_compressors_init();
	397	if (ret) {
5a528957	398	pr_err("error: Failed to initialise compressors\n");
1da177e4 LT	399	goto out;
	400	}
	401	ret = jffs2_create_slab_caches();
	402	if (ret) {
5a528957	403	pr_err("error: Failed to initialise slab caches\n");
1da177e4 LT	404	goto out_compressors;
	405	}
	406	ret = register_filesystem(&jffs2_fs_type);
	407	if (ret) {
5a528957	408	pr_err("error: Failed to register filesystem\n");
1da177e4 LT	409	goto out_slab;
	410	}
	411	return 0;
	412
	413	out_slab:
	414	jffs2_destroy_slab_caches();
	415	out_compressors:
	416	jffs2_compressors_exit();
	417	out:
	418	kmem_cache_destroy(jffs2_inode_cachep);
	419	return ret;
	420	}
	421
	422	static void __exit exit_jffs2_fs(void)
	423	{
	424	unregister_filesystem(&jffs2_fs_type);
	425	jffs2_destroy_slab_caches();
	426	jffs2_compressors_exit();
8c0a8537 KS	427
	428	/*
	429	* Make sure all delayed rcu free inodes are flushed before we
	430	* destroy cache.
	431	*/
	432	rcu_barrier();
1da177e4 LT	433	kmem_cache_destroy(jffs2_inode_cachep);
	434	}
	435
	436	module_init(init_jffs2_fs);
	437	module_exit(exit_jffs2_fs);
	438
	439	MODULE_DESCRIPTION("The Journalling Flash File System, v2");
	440	MODULE_AUTHOR("Red Hat, Inc.");
182ec4ee	441	MODULE_LICENSE("GPL"); // Actually dual-licensed, but it doesn't matter for
1da177e4	442	// the sake of this tag. It's Free Software.