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

/*
 * JFFS2 -- Journalling Flash File System, Version 2.
 *
 * Copyright © 2001-2007 Red Hat, Inc.
 *
 * Created by David Woodhouse <[email protected]>
 *
 * For licensing information, see the file 'LICENCE' in this directory.
 *
 */

#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/fs_context.h>
#include <linux/fs_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 = alloc_inode_sb(sb, jffs2_inode_cachep, GFP_KERNEL);
	if (!f)
		return NULL;
	return &f->vfs_inode;
}

static void jffs2_free_inode(struct inode *inode)
{
	struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);

	kfree(f->target);
	kmem_cache_free(jffs2_inode_cachep, f);
}

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->set_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
	if (jffs2_is_writebuffered(c))
		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(child->d_sb, pino));
}

static const struct export_operations jffs2_export_ops = {
	.encode_fh = generic_encode_ino32_fh,
	.get_parent = jffs2_get_parent,
	.fh_to_dentry = jffs2_fh_to_dentry,
	.fh_to_parent = jffs2_fh_to_parent,
};

/*
 * JFFS2 mount options.
 *
 * Opt_source: The source device
 * Opt_override_compr: override default compressor
 * Opt_rp_size: size of reserved pool in KiB
 */
enum {
	Opt_override_compr,
	Opt_rp_size,
};

static const struct constant_table jffs2_param_compr[] = {
	{"none",	JFFS2_COMPR_MODE_NONE },
#ifdef CONFIG_JFFS2_LZO
	{"lzo",		JFFS2_COMPR_MODE_FORCELZO },
#endif
#ifdef CONFIG_JFFS2_ZLIB
	{"zlib",	JFFS2_COMPR_MODE_FORCEZLIB },
#endif
	{}
};

static const struct fs_parameter_spec jffs2_fs_parameters[] = {
	fsparam_enum	("compr",	Opt_override_compr, jffs2_param_compr),
	fsparam_u32	("rp_size",	Opt_rp_size),
	{}
};

static int jffs2_parse_param(struct fs_context *fc, struct fs_parameter *param)
{
	struct fs_parse_result result;
	struct jffs2_sb_info *c = fc->s_fs_info;
	int opt;

	opt = fs_parse(fc, jffs2_fs_parameters, param, &result);
	if (opt < 0)
		return opt;

	switch (opt) {
	case Opt_override_compr:
		c->mount_opts.compr = result.uint_32;
		c->mount_opts.override_compr = true;
		break;
	case Opt_rp_size:
		if (result.uint_32 > UINT_MAX / 1024)
			return invalf(fc, "jffs2: rp_size unrepresentable");
		c->mount_opts.rp_size = result.uint_32 * 1024;
		c->mount_opts.set_rp_size = true;
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static inline void jffs2_update_mount_opts(struct fs_context *fc)
{
	struct jffs2_sb_info *new_c = fc->s_fs_info;
	struct jffs2_sb_info *c = JFFS2_SB_INFO(fc->root->d_sb);

	mutex_lock(&c->alloc_sem);
	if (new_c->mount_opts.override_compr) {
		c->mount_opts.override_compr = new_c->mount_opts.override_compr;
		c->mount_opts.compr = new_c->mount_opts.compr;
	}
	if (new_c->mount_opts.set_rp_size) {
		c->mount_opts.set_rp_size = new_c->mount_opts.set_rp_size;
		c->mount_opts.rp_size = new_c->mount_opts.rp_size;
	}
	mutex_unlock(&c->alloc_sem);
}

static int jffs2_reconfigure(struct fs_context *fc)
{
	struct super_block *sb = fc->root->d_sb;

	sync_filesystem(sb);
	jffs2_update_mount_opts(fc);

	return jffs2_do_remount_fs(sb, fc);
}

static const struct super_operations jffs2_super_operations =
{
	.alloc_inode =	jffs2_alloc_inode,
	.free_inode =	jffs2_free_inode,
	.put_super =	jffs2_put_super,
	.statfs =	jffs2_statfs,
	.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, struct fs_context *fc)
{
	struct jffs2_sb_info *c = sb->s_fs_info;

	jffs2_dbg(1, "jffs2_get_sb_mtd():"
		  " New superblock for device %d (\"%s\")\n",
		  sb->s_mtd->index, sb->s_mtd->name);

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

	if (c->mount_opts.rp_size > c->mtd->size)
		return invalf(fc, "jffs2: Too large reserve pool specified, max is %llu KB",
			      c->mtd->size / 1024);

	/* 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 | SB_NOATIME;
	sb->s_xattr = jffs2_xattr_handlers;
#ifdef CONFIG_JFFS2_FS_POSIX_ACL
	sb->s_flags |= SB_POSIXACL;
#endif
	return jffs2_do_fill_super(sb, fc);
}

static int jffs2_get_tree(struct fs_context *fc)
{
	return get_tree_mtd(fc, jffs2_fill_super);
}

static void jffs2_free_fc(struct fs_context *fc)
{
	kfree(fc->s_fs_info);
}

static const struct fs_context_operations jffs2_context_ops = {
	.free		= jffs2_free_fc,
	.parse_param	= jffs2_parse_param,
	.get_tree	= jffs2_get_tree,
	.reconfigure	= jffs2_reconfigure,
};

static int jffs2_init_fs_context(struct fs_context *fc)
{
	struct jffs2_sb_info *ctx;

	ctx = kzalloc(sizeof(struct jffs2_sb_info), GFP_KERNEL);
	if (!ctx)
		return -ENOMEM;

	fc->s_fs_info = ctx;
	fc->ops = &jffs2_context_ops;
	return 0;
}

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);
	kvfree(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 (c && !sb_rdonly(sb))
		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",
	.init_fs_context = jffs2_init_fs_context,
	.parameters =	jffs2_fs_parameters,
	.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|SLAB_ACCOUNT),
					     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 <[email protected]>
	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>
ec10a24f DH	22	#include <linux/fs_context.h>
ec10a24f DH	23	#include <linux/fs_parser.h>
1da177e4 LT	24	#include <linux/jffs2.h>
1da177e4 LT	25	#include <linux/pagemap.h>
acaebfd8	26	#include <linux/mtd/super.h>
1da177e4 LT	27	#include <linux/ctype.h>
1da177e4 LT	28	#include <linux/namei.h>
92abc475	29	#include <linux/seq_file.h>
5f556aab	30	#include <linux/exportfs.h>
1da177e4 LT	31	#include "compr.h"
	32	#include "nodelist.h"
	33
	34	static void jffs2_put_super(struct super_block *);
	35
e18b890b	36	static struct kmem_cache *jffs2_inode_cachep;
1da177e4 LT	37
	38	static struct inode jffs2_alloc_inode(struct super_block sb)
	39	{
4e571aba DW	40	struct jffs2_inode_info *f;
4e571aba DW	41
fd60b288	42	f = alloc_inode_sb(sb, jffs2_inode_cachep, GFP_KERNEL);
4e571aba	43	if (!f)
1da177e4	44	return NULL;
4e571aba	45	return &f->vfs_inode;
1da177e4 LT	46	}
1da177e4 LT	47
db0bd7b7	48	static void jffs2_free_inode(struct inode *inode)
1da177e4	49	{
4fdcfab5 AV	50	struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
	51
	52	kfree(f->target);
	53	kmem_cache_free(jffs2_inode_cachep, f);
1da177e4 LT	54	}
1da177e4 LT	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
92abc475 AS	64	static const char *jffs2_compr_name(unsigned int compr)
	65	{
	66	switch (compr) {
	67	case JFFS2_COMPR_MODE_NONE:
	68	return "none";
123005f3 AS	69	#ifdef CONFIG_JFFS2_LZO
	70	case JFFS2_COMPR_MODE_FORCELZO:
	71	return "lzo";
	72	#endif
	73	#ifdef CONFIG_JFFS2_ZLIB
	74	case JFFS2_COMPR_MODE_FORCEZLIB:
	75	return "zlib";
	76	#endif
92abc475 AS	77	default:
	78	/* should never happen; programmer error */
	79	WARN_ON(1);
	80	return "";
	81	}
	82	}
	83
34c80b1d	84	static int jffs2_show_options(struct seq_file s, struct dentry root)
92abc475	85	{
34c80b1d	86	struct jffs2_sb_info *c = JFFS2_SB_INFO(root->d_sb);
92abc475 AS	87	struct jffs2_mount_opts *opts = &c->mount_opts;
	88
	89	if (opts->override_compr)
	90	seq_printf(s, ",compr=%s", jffs2_compr_name(opts->compr));
cd3ed3c7	91	if (opts->set_rp_size)
8da8ba2e	92	seq_printf(s, ",rp_size=%u", opts->rp_size / 1024);
92abc475 AS	93
	94	return 0;
	95	}
	96
1da177e4 LT	97	static int jffs2_sync_fs(struct super_block *sb, int wait)
	98	{
	99	struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
	100
a445f784	101	#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
a788c527 DS	102	if (jffs2_is_writebuffered(c))
a788c527 DS	103	cancel_delayed_work_sync(&c->wbuf_dwork);
a445f784 AB	104	#endif
a445f784 AB	105
ced22070	106	mutex_lock(&c->alloc_sem);
1da177e4	107	jffs2_flush_wbuf_pad(c);
ced22070	108	mutex_unlock(&c->alloc_sem);
1da177e4 LT	109	return 0;
	110	}
	111
5f556aab DW	112	static struct inode jffs2_nfs_get_inode(struct super_block sb, uint64_t ino,
	113	uint32_t generation)
	114	{
	115	/* We don't care about i_generation. We'll destroy the flash
	116	before we start re-using inode numbers anyway. And even
	117	if that wasn't true, we'd have other problems...*/
	118	return jffs2_iget(sb, ino);
	119	}
	120
	121	static struct dentry jffs2_fh_to_dentry(struct super_block sb, struct fid *fid,
	122	int fh_len, int fh_type)
	123	{
	124	return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
	125	jffs2_nfs_get_inode);
	126	}
	127
	128	static struct dentry jffs2_fh_to_parent(struct super_block sb, struct fid *fid,
	129	int fh_len, int fh_type)
	130	{
	131	return generic_fh_to_parent(sb, fid, fh_len, fh_type,
	132	jffs2_nfs_get_inode);
	133	}
	134
	135	static struct dentry jffs2_get_parent(struct dentry child)
	136	{
	137	struct jffs2_inode_info *f;
	138	uint32_t pino;
	139
e36cb0b8	140	BUG_ON(!d_is_dir(child));
5f556aab	141
2b0143b5	142	f = JFFS2_INODE_INFO(d_inode(child));
5f556aab DW	143
	144	pino = f->inocache->pino_nlink;
	145
	146	JFFS2_DEBUG("Parent of directory ino #%u is #%u\n",
	147	f->inocache->ino, pino);
	148
fc64005c	149	return d_obtain_alias(jffs2_iget(child->d_sb, pino));
5f556aab DW	150	}
5f556aab DW	151
ac4cfdd6	152	static const struct export_operations jffs2_export_ops = {
e21fc203	153	.encode_fh = generic_encode_ino32_fh,
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	*
ec10a24f	162	* Opt_source: The source device
92abc475	163	* Opt_override_compr: override default compressor
8da8ba2e	164	* Opt_rp_size: size of reserved pool in KiB
92abc475 AS	165	*/
	166	enum {
	167	Opt_override_compr,
8da8ba2e	168	Opt_rp_size,
92abc475 AS	169	};
92abc475 AS	170
5eede625	171	static const struct constant_table jffs2_param_compr[] = {
2710c957	172	{"none", JFFS2_COMPR_MODE_NONE },
123005f3	173	#ifdef CONFIG_JFFS2_LZO
2710c957	174	{"lzo", JFFS2_COMPR_MODE_FORCELZO },
123005f3 AS	175	#endif
123005f3 AS	176	#ifdef CONFIG_JFFS2_ZLIB
2710c957	177	{"zlib", JFFS2_COMPR_MODE_FORCEZLIB },
123005f3	178	#endif
ec10a24f DH	179	{}
	180	};
	181
d7167b14	182	static const struct fs_parameter_spec jffs2_fs_parameters[] = {
2710c957 AV	183	fsparam_enum ("compr", Opt_override_compr, jffs2_param_compr),
	184	fsparam_u32 ("rp_size", Opt_rp_size),
	185	{}
	186	};
	187
ec10a24f DH	188	static int jffs2_parse_param(struct fs_context fc, struct fs_parameter param)
	189	{
	190	struct fs_parse_result result;
	191	struct jffs2_sb_info *c = fc->s_fs_info;
	192	int opt;
	193
d7167b14	194	opt = fs_parse(fc, jffs2_fs_parameters, param, &result);
ec10a24f DH	195	if (opt < 0)
	196	return opt;
	197
	198	switch (opt) {
	199	case Opt_override_compr:
	200	c->mount_opts.compr = result.uint_32;
	201	c->mount_opts.override_compr = true;
	202	break;
	203	case Opt_rp_size:
	204	if (result.uint_32 > UINT_MAX / 1024)
	205	return invalf(fc, "jffs2: rp_size unrepresentable");
a61df3c4	206	c->mount_opts.rp_size = result.uint_32 * 1024;
cd3ed3c7	207	c->mount_opts.set_rp_size = true;
ec10a24f DH	208	break;
	209	default:
	210	return -EINVAL;
92abc475 AS	211	}
	212
	213	return 0;
	214	}
	215
08cd274f	216	static inline void jffs2_update_mount_opts(struct fs_context *fc)
	217	{
	218	struct jffs2_sb_info *new_c = fc->s_fs_info;
	219	struct jffs2_sb_info *c = JFFS2_SB_INFO(fc->root->d_sb);
	220
	221	mutex_lock(&c->alloc_sem);
	222	if (new_c->mount_opts.override_compr) {
	223	c->mount_opts.override_compr = new_c->mount_opts.override_compr;
	224	c->mount_opts.compr = new_c->mount_opts.compr;
	225	}
cd3ed3c7	226	if (new_c->mount_opts.set_rp_size) {
cd3ed3c7	227	c->mount_opts.set_rp_size = new_c->mount_opts.set_rp_size;
08cd274f	228	c->mount_opts.rp_size = new_c->mount_opts.rp_size;
cd3ed3c7	229	}
08cd274f	230	mutex_unlock(&c->alloc_sem);
	231	}
	232
ec10a24f	233	static int jffs2_reconfigure(struct fs_context *fc)
92abc475	234	{
ec10a24f	235	struct super_block *sb = fc->root->d_sb;
92abc475	236
02b9984d	237	sync_filesystem(sb);
08cd274f	238	jffs2_update_mount_opts(fc);
08cd274f	239
ec10a24f	240	return jffs2_do_remount_fs(sb, fc);
92abc475 AS	241	}
92abc475 AS	242
ee9b6d61	243	static const struct super_operations jffs2_super_operations =
1da177e4 LT	244	{
1da177e4 LT	245	.alloc_inode = jffs2_alloc_inode,
db0bd7b7	246	.free_inode = jffs2_free_inode,
1da177e4	247	.put_super = jffs2_put_super,
1da177e4	248	.statfs = jffs2_statfs,
b57922d9	249	.evict_inode = jffs2_evict_inode,
1da177e4	250	.dirty_inode = jffs2_dirty_inode,
92abc475	251	.show_options = jffs2_show_options,
1da177e4 LT	252	.sync_fs = jffs2_sync_fs,
	253	};
	254
acaebfd8 DH	255	/*
	256	* fill in the superblock
	257	*/
ec10a24f	258	static int jffs2_fill_super(struct super_block sb, struct fs_context fc)
1da177e4	259	{
ec10a24f	260	struct jffs2_sb_info *c = sb->s_fs_info;
db719222	261
9c261b33	262	jffs2_dbg(1, "jffs2_get_sb_mtd():"
acaebfd8	263	" New superblock for device %d (\"%s\")\n",
9c261b33	264	sb->s_mtd->index, sb->s_mtd->name);
1da177e4	265
acaebfd8 DH	266	c->mtd = sb->s_mtd;
acaebfd8 DH	267	c->os_priv = sb;
92abc475	268
a61df3c4 JI	269	if (c->mount_opts.rp_size > c->mtd->size)
	270	return invalf(fc, "jffs2: Too large reserve pool specified, max is %llu KB",
	271	c->mtd->size / 1024);
	272
acaebfd8 DH	273	/* Initialize JFFS2 superblock locks, the further initialization will
acaebfd8 DH	274	* be done later */
ced22070 DW	275	mutex_init(&c->alloc_sem);
ced22070 DW	276	mutex_init(&c->erase_free_sem);
b6220598 AB	277	init_waitqueue_head(&c->erase_wait);
	278	init_waitqueue_head(&c->inocache_wq);
	279	spin_lock_init(&c->erase_completion_lock);
	280	spin_lock_init(&c->inocache_lock);
	281
1da177e4	282	sb->s_op = &jffs2_super_operations;
5f556aab	283	sb->s_export_op = &jffs2_export_ops;
1751e8a6	284	sb->s_flags = sb->s_flags \| SB_NOATIME;
aa98d7cf KK	285	sb->s_xattr = jffs2_xattr_handlers;
aa98d7cf KK	286	#ifdef CONFIG_JFFS2_FS_POSIX_ACL
1751e8a6	287	sb->s_flags \|= SB_POSIXACL;
aa98d7cf	288	#endif
ec10a24f DH	289	return jffs2_do_fill_super(sb, fc);
	290	}
	291
	292	static int jffs2_get_tree(struct fs_context *fc)
	293	{
	294	return get_tree_mtd(fc, jffs2_fill_super);
	295	}
	296
	297	static void jffs2_free_fc(struct fs_context *fc)
	298	{
	299	kfree(fc->s_fs_info);
1da177e4 LT	300	}
1da177e4 LT	301
ec10a24f DH	302	static const struct fs_context_operations jffs2_context_ops = {
	303	.free = jffs2_free_fc,
	304	.parse_param = jffs2_parse_param,
	305	.get_tree = jffs2_get_tree,
	306	.reconfigure = jffs2_reconfigure,
	307	};
	308
	309	static int jffs2_init_fs_context(struct fs_context *fc)
1da177e4	310	{
ec10a24f DH	311	struct jffs2_sb_info *ctx;
	312
	313	ctx = kzalloc(sizeof(struct jffs2_sb_info), GFP_KERNEL);
	314	if (!ctx)
	315	return -ENOMEM;
	316
	317	fc->s_fs_info = ctx;
	318	fc->ops = &jffs2_context_ops;
	319	return 0;
1da177e4 LT	320	}
	321
	322	static void jffs2_put_super (struct super_block *sb)
	323	{
	324	struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
	325
9c261b33	326	jffs2_dbg(2, "%s()\n", __func__);
1da177e4	327
ced22070	328	mutex_lock(&c->alloc_sem);
1da177e4	329	jffs2_flush_wbuf_pad(c);
ced22070	330	mutex_unlock(&c->alloc_sem);
e631ddba FH	331
	332	jffs2_sum_exit(c);
	333
1da177e4 LT	334	jffs2_free_ino_caches(c);
1da177e4 LT	335	jffs2_free_raw_node_refs(c);
1d5cfdb0	336	kvfree(c->blocks);
1da177e4 LT	337	jffs2_flash_cleanup(c);
1da177e4 LT	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);
c66b23c2	347	if (c && !sb_rdonly(sb))
a69dde91	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",
ec10a24f	356	.init_fs_context = jffs2_init_fs_context,
d7167b14	357	.parameters = jffs2_fs_parameters,
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	389	0, (SLAB_RECLAIM_ACCOUNT\|
5d097056	390	SLAB_MEM_SPREAD\|SLAB_ACCOUNT),
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.