[linux-2.6-block.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/jffs2.h>
#include <linux/pagemap.h>
#include <linux/mtd/super.h>
#include <linux/ctype.h>
#include <linux/namei.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 *ei;
	ei = (struct jffs2_inode_info *)kmem_cache_alloc(jffs2_inode_cachep, GFP_KERNEL);
	if (!ei)
		return NULL;
	return &ei->vfs_inode;
}

static void jffs2_destroy_inode(struct inode *inode)
{
	kmem_cache_free(jffs2_inode_cachep, JFFS2_INODE_INFO(inode));
}

static void jffs2_i_init_once(void * foo, struct kmem_cache * cachep, unsigned long flags)
{
	struct jffs2_inode_info *ei = (struct jffs2_inode_info *) foo;

	init_MUTEX(&ei->sem);
	inode_init_once(&ei->vfs_inode);
}

static int jffs2_sync_fs(struct super_block *sb, int wait)
{
	struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);

	down(&c->alloc_sem);
	jffs2_flush_wbuf_pad(c);
	up(&c->alloc_sem);
	return 0;
}

static const struct super_operations jffs2_super_operations =
{
	.alloc_inode =	jffs2_alloc_inode,
	.destroy_inode =jffs2_destroy_inode,
	.read_inode =	jffs2_read_inode,
	.put_super =	jffs2_put_super,
	.write_super =	jffs2_write_super,
	.statfs =	jffs2_statfs,
	.remount_fs =	jffs2_remount_fs,
	.clear_inode =	jffs2_clear_inode,
	.dirty_inode =	jffs2_dirty_inode,
	.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;

	D1(printk(KERN_DEBUG "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;

	/* Initialize JFFS2 superblock locks, the further initialization will
	 * be done later */
	init_MUTEX(&c->alloc_sem);
	init_MUTEX(&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_flags = sb->s_flags | MS_NOATIME;
	sb->s_xattr = jffs2_xattr_handlers;
#ifdef CONFIG_JFFS2_FS_POSIX_ACL
	sb->s_flags |= MS_POSIXACL;
#endif
	return jffs2_do_fill_super(sb, data, silent);
}

static int jffs2_get_sb(struct file_system_type *fs_type,
			int flags, const char *dev_name,
			void *data, struct vfsmount *mnt)
{
	return get_sb_mtd(fs_type, flags, dev_name, data, jffs2_fill_super,
			  mnt);
}

static void jffs2_put_super (struct super_block *sb)
{
	struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);

	D2(printk(KERN_DEBUG "jffs2: jffs2_put_super()\n"));

	down(&c->alloc_sem);
	jffs2_flush_wbuf_pad(c);
	up(&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);
	if (c->mtd->sync)
		c->mtd->sync(c->mtd);

	D1(printk(KERN_DEBUG "jffs2_put_super returning\n"));
}

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",
	.get_sb =	jffs2_get_sb,
	.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 LT	19	#include <linux/mount.h>
	20	#include <linux/jffs2.h>
	21	#include <linux/pagemap.h>
acaebfd8	22	#include <linux/mtd/super.h>
1da177e4 LT	23	#include <linux/ctype.h>
	24	#include <linux/namei.h>
	25	#include "compr.h"
	26	#include "nodelist.h"
	27
	28	static void jffs2_put_super(struct super_block *);
	29
e18b890b	30	static struct kmem_cache *jffs2_inode_cachep;
1da177e4 LT	31
	32	static struct inode jffs2_alloc_inode(struct super_block sb)
	33	{
	34	struct jffs2_inode_info *ei;
e94b1766	35	ei = (struct jffs2_inode_info *)kmem_cache_alloc(jffs2_inode_cachep, GFP_KERNEL);
1da177e4 LT	36	if (!ei)
	37	return NULL;
	38	return &ei->vfs_inode;
	39	}
	40
	41	static void jffs2_destroy_inode(struct inode *inode)
	42	{
	43	kmem_cache_free(jffs2_inode_cachep, JFFS2_INODE_INFO(inode));
	44	}
	45
e18b890b	46	static void jffs2_i_init_once(void * foo, struct kmem_cache * cachep, unsigned long flags)
1da177e4 LT	47	{
	48	struct jffs2_inode_info ei = (struct jffs2_inode_info ) foo;
	49
a35afb83 CL	50	init_MUTEX(&ei->sem);
a35afb83 CL	51	inode_init_once(&ei->vfs_inode);
1da177e4 LT	52	}
	53
	54	static int jffs2_sync_fs(struct super_block *sb, int wait)
	55	{
	56	struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
	57
	58	down(&c->alloc_sem);
	59	jffs2_flush_wbuf_pad(c);
182ec4ee	60	up(&c->alloc_sem);
1da177e4 LT	61	return 0;
	62	}
	63
ee9b6d61	64	static const struct super_operations jffs2_super_operations =
1da177e4 LT	65	{
	66	.alloc_inode = jffs2_alloc_inode,
	67	.destroy_inode =jffs2_destroy_inode,
	68	.read_inode = jffs2_read_inode,
	69	.put_super = jffs2_put_super,
	70	.write_super = jffs2_write_super,
	71	.statfs = jffs2_statfs,
	72	.remount_fs = jffs2_remount_fs,
	73	.clear_inode = jffs2_clear_inode,
	74	.dirty_inode = jffs2_dirty_inode,
	75	.sync_fs = jffs2_sync_fs,
	76	};
	77
acaebfd8 DH	78	/*
	79	* fill in the superblock
	80	*/
	81	static int jffs2_fill_super(struct super_block sb, void data, int silent)
1da177e4	82	{
1da177e4	83	struct jffs2_sb_info *c;
acaebfd8 DH	84
	85	D1(printk(KERN_DEBUG "jffs2_get_sb_mtd():"
	86	" New superblock for device %d (\"%s\")\n",
	87	sb->s_mtd->index, sb->s_mtd->name));
1da177e4	88
f8314dc6	89	c = kzalloc(sizeof(*c), GFP_KERNEL);
1da177e4	90	if (!c)
454e2398	91	return -ENOMEM;
1da177e4	92
acaebfd8 DH	93	c->mtd = sb->s_mtd;
	94	c->os_priv = sb;
	95	sb->s_fs_info = c;
1da177e4	96
acaebfd8 DH	97	/* Initialize JFFS2 superblock locks, the further initialization will
acaebfd8 DH	98	* be done later */
b6220598 AB	99	init_MUTEX(&c->alloc_sem);
	100	init_MUTEX(&c->erase_free_sem);
	101	init_waitqueue_head(&c->erase_wait);
	102	init_waitqueue_head(&c->inocache_wq);
	103	spin_lock_init(&c->erase_completion_lock);
	104	spin_lock_init(&c->inocache_lock);
	105
1da177e4	106	sb->s_op = &jffs2_super_operations;
acaebfd8	107	sb->s_flags = sb->s_flags \| MS_NOATIME;
aa98d7cf KK	108	sb->s_xattr = jffs2_xattr_handlers;
	109	#ifdef CONFIG_JFFS2_FS_POSIX_ACL
	110	sb->s_flags \|= MS_POSIXACL;
	111	#endif
acaebfd8	112	return jffs2_do_fill_super(sb, data, silent);
1da177e4 LT	113	}
1da177e4 LT	114
454e2398 DH	115	static int jffs2_get_sb(struct file_system_type *fs_type,
	116	int flags, const char *dev_name,
	117	void data, struct vfsmount mnt)
1da177e4	118	{
acaebfd8 DH	119	return get_sb_mtd(fs_type, flags, dev_name, data, jffs2_fill_super,
acaebfd8 DH	120	mnt);
1da177e4 LT	121	}
	122
	123	static void jffs2_put_super (struct super_block *sb)
	124	{
	125	struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
	126
	127	D2(printk(KERN_DEBUG "jffs2: jffs2_put_super()\n"));
	128
1da177e4 LT	129	down(&c->alloc_sem);
	130	jffs2_flush_wbuf_pad(c);
	131	up(&c->alloc_sem);
e631ddba FH	132
	133	jffs2_sum_exit(c);
	134
1da177e4 LT	135	jffs2_free_ino_caches(c);
1da177e4 LT	136	jffs2_free_raw_node_refs(c);
4ce1f562	137	if (jffs2_blocks_use_vmalloc(c))
1da177e4 LT	138	vfree(c->blocks);
	139	else
	140	kfree(c->blocks);
	141	jffs2_flash_cleanup(c);
	142	kfree(c->inocache_list);
aa98d7cf	143	jffs2_clear_xattr_subsystem(c);
1da177e4 LT	144	if (c->mtd->sync)
	145	c->mtd->sync(c->mtd);
	146
	147	D1(printk(KERN_DEBUG "jffs2_put_super returning\n"));
	148	}
	149
	150	static void jffs2_kill_sb(struct super_block *sb)
	151	{
	152	struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
a69dde91 AB	153	if (!(sb->s_flags & MS_RDONLY))
a69dde91 AB	154	jffs2_stop_garbage_collect_thread(c);
acaebfd8	155	kill_mtd_super(sb);
1da177e4 LT	156	kfree(c);
	157	}
	158
	159	static struct file_system_type jffs2_fs_type = {
	160	.owner = THIS_MODULE,
	161	.name = "jffs2",
	162	.get_sb = jffs2_get_sb,
	163	.kill_sb = jffs2_kill_sb,
	164	};
	165
	166	static int __init init_jffs2_fs(void)
	167	{
	168	int ret;
	169
3e68fbb5 DW	170	/* Paranoia checks for on-medium structures. If we ask GCC
	171	to pack them with __attribute__((packed)) then it _also_
	172	assumes that they're not aligned -- so it emits crappy
	173	code on some architectures. Ideally we want an attribute
	174	which means just 'no padding', without the alignment
	175	thing. But GCC doesn't have that -- we have to just
	176	hope the structs are the right sizes, instead. */
2ecd05ae AD	177	BUILD_BUG_ON(sizeof(struct jffs2_unknown_node) != 12);
	178	BUILD_BUG_ON(sizeof(struct jffs2_raw_dirent) != 40);
	179	BUILD_BUG_ON(sizeof(struct jffs2_raw_inode) != 68);
	180	BUILD_BUG_ON(sizeof(struct jffs2_raw_summary) != 32);
3e68fbb5	181
1da177e4	182	printk(KERN_INFO "JFFS2 version 2.2."
2f82ce1e	183	#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
1da177e4	184	" (NAND)"
e631ddba FH	185	#endif
	186	#ifdef CONFIG_JFFS2_SUMMARY
	187	" (SUMMARY) "
1da177e4	188	#endif
c00c310e	189	" © 2001-2006 Red Hat, Inc.\n");
1da177e4 LT	190
	191	jffs2_inode_cachep = kmem_cache_create("jffs2_i",
	192	sizeof(struct jffs2_inode_info),
fffb60f9 PJ	193	0, (SLAB_RECLAIM_ACCOUNT\|
fffb60f9 PJ	194	SLAB_MEM_SPREAD),
20c2df83	195	jffs2_i_init_once);
1da177e4 LT	196	if (!jffs2_inode_cachep) {
	197	printk(KERN_ERR "JFFS2 error: Failed to initialise inode cache\n");
	198	return -ENOMEM;
	199	}
	200	ret = jffs2_compressors_init();
	201	if (ret) {
	202	printk(KERN_ERR "JFFS2 error: Failed to initialise compressors\n");
	203	goto out;
	204	}
	205	ret = jffs2_create_slab_caches();
	206	if (ret) {
	207	printk(KERN_ERR "JFFS2 error: Failed to initialise slab caches\n");
	208	goto out_compressors;
	209	}
	210	ret = register_filesystem(&jffs2_fs_type);
	211	if (ret) {
	212	printk(KERN_ERR "JFFS2 error: Failed to register filesystem\n");
	213	goto out_slab;
	214	}
	215	return 0;
	216
	217	out_slab:
	218	jffs2_destroy_slab_caches();
	219	out_compressors:
	220	jffs2_compressors_exit();
	221	out:
	222	kmem_cache_destroy(jffs2_inode_cachep);
	223	return ret;
	224	}
	225
	226	static void __exit exit_jffs2_fs(void)
	227	{
	228	unregister_filesystem(&jffs2_fs_type);
	229	jffs2_destroy_slab_caches();
	230	jffs2_compressors_exit();
	231	kmem_cache_destroy(jffs2_inode_cachep);
	232	}
	233
	234	module_init(init_jffs2_fs);
	235	module_exit(exit_jffs2_fs);
	236
	237	MODULE_DESCRIPTION("The Journalling Flash File System, v2");
	238	MODULE_AUTHOR("Red Hat, Inc.");
182ec4ee	239	MODULE_LICENSE("GPL"); // Actually dual-licensed, but it doesn't matter for
1da177e4	240	// the sake of this tag. It's Free Software.