-/*
- * JFFS2 -- Journalling Flash File System, Version 2.
- *
- * Copyright (C) 2001 Red Hat, Inc.
- *
- * Created by David Woodhouse <dwmw2@cambridge.redhat.com>
- *
- * The original JFFS, from which the design for JFFS2 was derived,
- * was designed and implemented by Axis Communications AB.
- *
- * The contents of this file are subject to the Red Hat eCos Public
- * License Version 1.1 (the "Licence"); you may not use this file
- * except in compliance with the Licence. You may obtain a copy of
- * the Licence at http://www.redhat.com/
- *
- * Software distributed under the Licence is distributed on an "AS IS"
- * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.
- * See the Licence for the specific language governing rights and
- * limitations under the Licence.
- *
- * The Original Code is JFFS2 - Journalling Flash File System, version 2
- *
- * Alternatively, the contents of this file may be used under the
- * terms of the GNU General Public License version 2 (the "GPL"), in
- * which case the provisions of the GPL are applicable instead of the
- * above. If you wish to allow the use of your version of this file
- * only under the terms of the GPL and not to allow others to use your
- * version of this file under the RHEPL, indicate your decision by
- * deleting the provisions above and replace them with the notice and
- * other provisions required by the GPL. If you do not delete the
- * provisions above, a recipient may use your version of this file
- * under either the RHEPL or the GPL.
- *
- * $Id: yaffs_super.c,v 1.1 2002-05-20 17:42:08 aleph1 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 <linux/interrupt.h>
-#include "nodelist.h"
-
-#ifndef MTD_BLOCK_MAJOR
-#define MTD_BLOCK_MAJOR 31
-#endif
-
-extern void jffs2_read_inode (struct inode *);
-void jffs2_put_super (struct super_block *);
-void jffs2_write_super (struct super_block *);
-static int jffs2_statfs (struct super_block *, struct statfs *);
-int jffs2_remount_fs (struct super_block *, int *, char *);
-extern void jffs2_clear_inode (struct inode *);
-
-static struct super_operations jffs2_super_operations =
-{
- read_inode: jffs2_read_inode,
-// delete_inode: jffs2_delete_inode,
- put_super: jffs2_put_super,
- write_super: jffs2_write_super,
- statfs: jffs2_statfs,
- remount_fs: jffs2_remount_fs,
- clear_inode: jffs2_clear_inode
-};
-
-static int jffs2_statfs(struct super_block *sb, struct statfs *buf)
-{
- struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
- unsigned long avail;
-
- buf->f_type = JFFS2_SUPER_MAGIC;
- buf->f_bsize = 1 << PAGE_SHIFT;
- buf->f_blocks = c->flash_size >> PAGE_SHIFT;
- buf->f_files = 0;
- buf->f_ffree = 0;
- buf->f_namelen = JFFS2_MAX_NAME_LEN;
-
- spin_lock_bh(&c->erase_completion_lock);
-
- avail = c->dirty_size + c->free_size;
- if (avail > c->sector_size * JFFS2_RESERVED_BLOCKS_WRITE)
- avail -= c->sector_size * JFFS2_RESERVED_BLOCKS_WRITE;
- else
- avail = 0;
-
- buf->f_bavail = buf->f_bfree = avail >> PAGE_SHIFT;
-
-#if CONFIG_JFFS2_FS_DEBUG > 0
- printk(KERN_DEBUG "STATFS:\n");
- printk(KERN_DEBUG "flash_size: %08x\n", c->flash_size);
- printk(KERN_DEBUG "used_size: %08x\n", c->used_size);
- printk(KERN_DEBUG "dirty_size: %08x\n", c->dirty_size);
- printk(KERN_DEBUG "free_size: %08x\n", c->free_size);
- printk(KERN_DEBUG "erasing_size: %08x\n", c->erasing_size);
- printk(KERN_DEBUG "bad_size: %08x\n", c->bad_size);
- printk(KERN_DEBUG "sector_size: %08x\n", c->sector_size);
-
- if (c->nextblock) {
- printk(KERN_DEBUG "nextblock: 0x%08x\n", c->nextblock->offset);
- } else {
- printk(KERN_DEBUG "nextblock: NULL\n");
- }
- if (c->gcblock) {
- printk(KERN_DEBUG "gcblock: 0x%08x\n", c->gcblock->offset);
- } else {
- printk(KERN_DEBUG "gcblock: NULL\n");
- }
- if (list_empty(&c->clean_list)) {
- printk(KERN_DEBUG "clean_list: empty\n");
- } else {
- struct list_head *this;
-
- list_for_each(this, &c->clean_list) {
- struct jffs2_eraseblock *jeb = list_entry(this, struct jffs2_eraseblock, list);
- printk(KERN_DEBUG "clean_list: %08x\n", jeb->offset);
- }
- }
- if (list_empty(&c->dirty_list)) {
- printk(KERN_DEBUG "dirty_list: empty\n");
- } else {
- struct list_head *this;
-
- list_for_each(this, &c->dirty_list) {
- struct jffs2_eraseblock *jeb = list_entry(this, struct jffs2_eraseblock, list);
- printk(KERN_DEBUG "dirty_list: %08x\n", jeb->offset);
- }
- }
- if (list_empty(&c->erasing_list)) {
- printk(KERN_DEBUG "erasing_list: empty\n");
- } else {
- struct list_head *this;
-
- list_for_each(this, &c->erasing_list) {
- struct jffs2_eraseblock *jeb = list_entry(this, struct jffs2_eraseblock, list);
- printk(KERN_DEBUG "erasing_list: %08x\n", jeb->offset);
- }
- }
- if (list_empty(&c->erase_pending_list)) {
- printk(KERN_DEBUG "erase_pending_list: empty\n");
- } else {
- struct list_head *this;
-
- list_for_each(this, &c->erase_pending_list) {
- struct jffs2_eraseblock *jeb = list_entry(this, struct jffs2_eraseblock, list);
- printk(KERN_DEBUG "erase_pending_list: %08x\n", jeb->offset);
- }
- }
- if (list_empty(&c->free_list)) {
- printk(KERN_DEBUG "free_list: empty\n");
- } else {
- struct list_head *this;
-
- list_for_each(this, &c->free_list) {
- struct jffs2_eraseblock *jeb = list_entry(this, struct jffs2_eraseblock, list);
- printk(KERN_DEBUG "free_list: %08x\n", jeb->offset);
- }
- }
- if (list_empty(&c->bad_list)) {
- printk(KERN_DEBUG "bad_list: empty\n");
- } else {
- struct list_head *this;
-
- list_for_each(this, &c->bad_list) {
- struct jffs2_eraseblock *jeb = list_entry(this, struct jffs2_eraseblock, list);
- printk(KERN_DEBUG "bad_list: %08x\n", jeb->offset);
- }
- }
- if (list_empty(&c->bad_used_list)) {
- printk(KERN_DEBUG "bad_used_list: empty\n");
- } else {
- struct list_head *this;
-
- list_for_each(this, &c->bad_used_list) {
- struct jffs2_eraseblock *jeb = list_entry(this, struct jffs2_eraseblock, list);
- printk(KERN_DEBUG "bad_used_list: %08x\n", jeb->offset);
- }
- }
-#endif /* CONFIG_JFFS2_FS_DEBUG */
-
- spin_unlock_bh(&c->erase_completion_lock);
-
-
- return 0;
-}
-
-static struct super_block *jffs2_read_super(struct super_block *sb, void *data, int silent)
-{
- struct jffs2_sb_info *c;
- struct inode *root_i;
- int i;
-
- 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));
-
- 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;
- }
- c->sector_size = c->mtd->erasesize;
- c->free_size = c->flash_size = c->mtd->size;
- c->nr_blocks = c->mtd->size / c->mtd->erasesize;
- c->blocks = kmalloc(sizeof(struct jffs2_eraseblock) * c->nr_blocks, GFP_KERNEL);
- if (!c->blocks)
- goto out_mtd;
- for (i=0; i<c->nr_blocks; i++) {
- INIT_LIST_HEAD(&c->blocks[i].list);
- c->blocks[i].offset = i * c->sector_size;
- c->blocks[i].free_size = c->sector_size;
- c->blocks[i].dirty_size = 0;
- c->blocks[i].used_size = 0;
- c->blocks[i].first_node = NULL;
- c->blocks[i].last_node = NULL;
- }
-
- spin_lock_init(&c->nodelist_lock);
- init_MUTEX(&c->alloc_sem);
- init_waitqueue_head(&c->erase_wait);
- spin_lock_init(&c->erase_completion_lock);
- spin_lock_init(&c->inocache_lock);
-
- INIT_LIST_HEAD(&c->clean_list);
- INIT_LIST_HEAD(&c->dirty_list);
- INIT_LIST_HEAD(&c->erasing_list);
- INIT_LIST_HEAD(&c->erase_pending_list);
- INIT_LIST_HEAD(&c->erase_complete_list);
- INIT_LIST_HEAD(&c->free_list);
- INIT_LIST_HEAD(&c->bad_list);
- INIT_LIST_HEAD(&c->bad_used_list);
- c->highest_ino = 1;
-
- if (jffs2_build_filesystem(c)) {
- D1(printk(KERN_DEBUG "build_fs failed\n"));
- goto out_nodes;
- }
- sb->s_op = &jffs2_super_operations;
-
- D1(printk(KERN_DEBUG "jffs2_read_super(): Getting root inode\n"));
- root_i = iget(sb, 1);
- if (is_bad_inode(root_i)) {
- D1(printk(KERN_WARNING "get root inode failed\n"));
- goto out_nodes;
- }
-
- D1(printk(KERN_DEBUG "jffs2_read_super(): d_alloc_root()\n"));
- sb->s_root = d_alloc_root(root_i);
- if (!sb->s_root)
- goto out_root_i;
-
-#if LINUX_VERSION_CODE >= 0x20403
- sb->s_maxbytes = 0xFFFFFFFF;
-#endif
- sb->s_blocksize = PAGE_CACHE_SIZE;
- sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
- sb->s_magic = JFFS2_SUPER_MAGIC;
- if (!(sb->s_flags & MS_RDONLY))
- jffs2_start_garbage_collect_thread(c);
- return sb;
-
- out_root_i:
- iput(root_i);
- out_nodes:
- jffs2_free_ino_caches(c);
- jffs2_free_raw_node_refs(c);
- kfree(c->blocks);
- out_mtd:
- put_mtd_device(c->mtd);
- return NULL;
-}
-
-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);
- jffs2_free_ino_caches(c);
- jffs2_free_raw_node_refs(c);
- kfree(c->blocks);
- if (c->mtd->sync)
- c->mtd->sync(c->mtd);
- put_mtd_device(c->mtd);
-
- D1(printk(KERN_DEBUG "jffs2_put_super returning\n"));
-}
-
-int jffs2_remount_fs (struct super_block *sb, int *flags, char *data)
-{
- struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
-
- if (c->flags & JFFS2_SB_FLAG_RO && !(sb->s_flags & MS_RDONLY))
- return -EROFS;
-
- /* We stop if it was running, then restart if it needs to.
- This also catches the case where it was stopped and this
- is just a remount to restart it */
- if (!(sb->s_flags & MS_RDONLY))
- jffs2_stop_garbage_collect_thread(c);
-
- if (!(*flags & MS_RDONLY))
- jffs2_start_garbage_collect_thread(c);
-
- sb->s_flags = (sb->s_flags & ~MS_RDONLY)|(*flags & MS_RDONLY);
-
- return 0;
-}
-
-void jffs2_write_super (struct super_block *sb)
-{
- struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
- sb->s_dirt = 0;
-
- if (sb->s_flags & MS_RDONLY)
- return;
-
- jffs2_garbage_collect_trigger(c);
- jffs2_erase_pending_blocks(c);
- jffs2_mark_erased_blocks(c);
-}
-
-
-static DECLARE_FSTYPE_DEV(jffs2_fs_type, "jffs2", jffs2_read_super);
-
-static int __init init_jffs2_fs(void)
-{
- int ret;
-
- printk(KERN_NOTICE "JFFS2 version 2.1. (C) 2001 Red Hat, Inc., designed by Axis Communications AB.\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_create_slab_caches();
- if (ret) {
- printk(KERN_ERR "JFFS2 error: Failed to initialise slab caches\n");
- return ret;
- }
- ret = register_filesystem(&jffs2_fs_type);
- if (ret) {
- printk(KERN_ERR "JFFS2 error: Failed to register filesystem\n");
- jffs2_destroy_slab_caches();
- }
- return ret;
-}
-
-static void __exit exit_jffs2_fs(void)
-{
- jffs2_destroy_slab_caches();
- 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.
-/*
- * YAFFS: Yet another FFS. A NAND-flash specific file system.
- *
- * Copyright (C) 2002 Aleph One Ltd.
- * for Toby Churchill Ltd and Brightstar Engineering
- *
- * Created by Charles Manning <charles@aleph1.co.uk>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- */
projects / yaffs / .git / commitdiff