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/*
* JFFS2 -- Journalling Flash File System, Version 2.
*
* Copyright (C) 2001-2003 Red Hat, Inc.
*
* Created by David Woodhouse <dwmw2@infradead.org>
*
* For licensing information, see the file 'LICENCE' in this directory.
*
* $Id: super-v24.c,v 1.88 2005/11/11 08:51:39 forrest Exp $
*
*/
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/version.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/fs.h>
#include <linux/jffs2.h>
#include <linux/pagemap.h>
#include <linux/mtd/mtd.h>
#include "compr.h"
#include "nodelist.h"
#include "summary.h"
#ifndef MTD_BLOCK_MAJOR
#define MTD_BLOCK_MAJOR 31
#endif
static void jffs2_put_super (struct super_block *);
static struct super_operations jffs2_super_operations =
{
.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,
};
static struct super_block *jffs2_read_super(struct super_block *sb, void *data, int silent)
{
struct jffs2_sb_info *c;
int ret;
D1(printk(KERN_DEBUG "jffs2: read_super for device %s\n", kdevname(sb->s_dev)));
if (major(sb->s_dev) != MTD_BLOCK_MAJOR) {
if (!silent)
printk(KERN_DEBUG "jffs2: attempt to mount non-MTD device %s\n", kdevname(sb->s_dev));
return NULL;
}
c = JFFS2_SB_INFO(sb);
memset(c, 0, sizeof(*c));
/* Initialize JFFS2 superblock locks now, the further superblock
* 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;
c->mtd = get_mtd_device(NULL, minor(sb->s_dev));
if (!c->mtd) {
D1(printk(KERN_DEBUG "jffs2: MTD device #%u doesn't appear to exist\n", minor(sb->s_dev)));
return NULL;
}
ret = jffs2_do_fill_super(sb, data, silent);
if (ret) {
put_mtd_device(c->mtd);
return NULL;
}
return sb;
}
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"));
if (!(sb->s_flags & MS_RDONLY))
jffs2_stop_garbage_collect_thread(c);
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);
jffs2_free_eraseblocks(c);
jffs2_flash_cleanup(c);
kfree(c->inocache_list);
if (c->mtd->sync)
c->mtd->sync(c->mtd);
put_mtd_device(c->mtd);
D1(printk(KERN_DEBUG "jffs2_put_super returning\n"));
}
static DECLARE_FSTYPE_DEV(jffs2_fs_type, "jffs2", jffs2_read_super);
static int __init init_jffs2_fs(void)
{
int ret;
printk(KERN_INFO "JFFS2 version 2.2."
#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
" (NAND)"
#endif
#ifdef CONFIG_JFFS2_SUMMARY
" (SUMMARY)"
#endif
" (C) 2001-2003 Red Hat, Inc.\n");
#ifdef JFFS2_OUT_OF_KERNEL
/* sanity checks. Could we do these at compile time? */
if (sizeof(struct jffs2_sb_info) > sizeof (((struct super_block *)NULL)->u)) {
printk(KERN_ERR "JFFS2 error: struct jffs2_sb_info (%d bytes) doesn't fit in the super_block union (%d bytes)\n",
sizeof(struct jffs2_sb_info), sizeof (((struct super_block *)NULL)->u));
return -EIO;
}
if (sizeof(struct jffs2_inode_info) > sizeof (((struct inode *)NULL)->u)) {
printk(KERN_ERR "JFFS2 error: struct jffs2_inode_info (%d bytes) doesn't fit in the inode union (%d bytes)\n",
sizeof(struct jffs2_inode_info), sizeof (((struct inode *)NULL)->u));
return -EIO;
}
#endif
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:
return ret;
}
static void __exit exit_jffs2_fs(void)
{
jffs2_destroy_slab_caches();
jffs2_compressors_exit();
unregister_filesystem(&jffs2_fs_type);
}
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.
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