/*
* 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/sched.h>
#include <linux/slab.h>
#include <linux/mtd/mtd.h>
#include <linux/pagemap.h>
#include <linux/crc32.h>
#include <linux/compiler.h>
#include "nodelist.h"
#include "summary.h"
#include "debug.h"
#define DEFAULT_EMPTY_SCAN_SIZE 256
#define noisy_printk(noise, fmt, ...) \
do { \
if (*(noise)) { \
pr_notice(fmt, ##__VA_ARGS__); \
(*(noise))--; \
if (!(*(noise))) \
pr_notice("Further such events for this erase block will not be printed\n"); \
} \
} while (0)
static uint32_t pseudo_random;
static int jffs2_scan_eraseblock (struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
unsigned char *buf, uint32_t buf_size, struct jffs2_summary *s);
/* These helper functions _must_ increase ofs and also do the dirty/used space accounting.
* Returning an error will abort the mount - bad checksums etc. should just mark the space
* as dirty.
*/
static int jffs2_scan_inode_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
struct jffs2_raw_inode *ri, uint32_t ofs, struct jffs2_summary *s);
static int jffs2_scan_dirent_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
struct jffs2_raw_dirent *rd, uint32_t ofs, struct jffs2_summary *s);
static inline int min_free(struct jffs2_sb_info *c)
{
uint32_t min = 2 * sizeof(struct jffs2_raw_inode);
#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
if (!jffs2_can_mark_obsolete(c) && min < c->wbuf_pagesize)
return c->wbuf_pagesize;
#endif
return min;
}
static inline uint32_t EMPTY_SCAN_SIZE(uint32_t sector_size) {
if (sector_size < DEFAULT_EMPTY_SCAN_SIZE)
return sector_size;
else
return DEFAULT_EMPTY_SCAN_SIZE;
}
static int file_dirty(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb)
{
int ret;
if ((ret = jffs2_prealloc_raw_node_refs(c, jeb, 1)))
return ret;
if ((ret = jffs2_scan_dirty_space(c, jeb, jeb->free_size)))
return ret;
/* Turned wasted size into dirty, since we apparently
think it's recoverable now. */
jeb->dirty_size += jeb->wasted_size;
c->dirty_size += jeb->wasted_size;
c->wasted_size -= jeb->wasted_size;
jeb->wasted_size = 0;
if (VERYDIRTY(c, jeb->dirty_size)) {
list_add(&jeb->list, &c->very_dirty_list);
} else {
list_add(&jeb->list, &c->dirty_list);
}
return 0;
}
int jffs2_scan_medium(struct jffs2_sb_info *c)
{
int i, ret;
uint32_t empty_blocks = 0, bad_blocks = 0;
unsigned char *flashbuf = NULL;
uint32_t buf_size = 0;
struct jffs2_summary *s = NULL; /* summary info collected by the scan process */
#ifndef __ECOS
size_t pointlen, try_size;
ret = mtd_point(c->mtd, 0, c