jffs2_nand_1pass.c

OMAP2530 uboot source code

	{
		strncpy(working_tmp, tmp, c - tmp);
		working_tmp[c - tmp] = '\0';
#if 0
		putstr("search_inode: tmp = ");
		putstr(tmp);
		putstr("\r\n");
		putstr("search_inode: wtmp = ");
		putstr(working_tmp);
		putstr("\r\n");
		putstr("search_inode: c = ");
		putstr(c);
		putstr("\r\n");
#endif
		for (i = 0; i < strlen(c) - 1; i++)
			tmp[i] = c[i + 1];
		tmp[i] = '\0';
#if 0
		putstr("search_inode: post tmp = ");
		putstr(tmp);
		putstr("\r\n");
#endif

		if (!(pino = jffs2_1pass_find_inode(pL, working_tmp, pino))) {
			putstr("find_inode failed for name=");
			putstr(working_tmp);
			putstr("\r\n");
			return 0;
		}
	}
	/* this is for the bare filename, directories have already been mapped */
	if (!(pino = jffs2_1pass_find_inode(pL, tmp, pino))) {
		putstr("find_inode failed for name=");
		putstr(tmp);
		putstr("\r\n");
		return 0;
	}
	return pino;

}

static u32
jffs2_1pass_resolve_inode(struct b_lists * pL, u32 ino)
{
	struct b_dirent *jDir;
	struct b_inode *jNode;
	u8 jDirFoundType = 0;
	u32 jDirFoundIno = 0;
	u32 jDirFoundPino = 0;
	char tmp[JFFS2_MAX_NAME_LEN + 1];
	u32 version = 0;
	u32 pino;

	/* we need to search all and return the inode with the highest version */
	for (jDir = (struct b_dirent *)pL->dir.listHead; jDir; jDir = jDir->next) {
		if (ino == jDir->ino) {
			if (jDir->version < version)
				continue;

			if (jDir->version == version && jDirFoundType) {
				/* I'm pretty sure this isn't legal */
				putstr(" ** ERROR ** ");
/*				putnstr(jDir->name, jDir->nsize); */
/*				putLabeledWord(" has dup version (resolve) = ", */
/*					version); */
			}

			jDirFoundType = jDir->type;
			jDirFoundIno = jDir->ino;
			jDirFoundPino = jDir->pino;
			version = jDir->version;
		}
	}
	/* now we found the right entry again. (shoulda returned inode*) */
	if (jDirFoundType != DT_LNK)
		return jDirFoundIno;

	/* it's a soft link so we follow it again. */
	for (jNode = (struct b_inode *)pL->frag.listHead; jNode; jNode = jNode->next) {
		if (jNode->ino == jDirFoundIno) {
			size_t len = jNode->csize;
			nand_read(nand, jNode->offset + sizeof(struct jffs2_raw_inode), &len, &tmp);
			tmp[jNode->csize] = '\0';
			break;
		}
	}
	/* ok so the name of the new file to find is in tmp */
	/* if it starts with a slash it is root based else shared dirs */
	if (tmp[0] == '/')
		pino = 1;
	else
		pino = jDirFoundPino;

	return jffs2_1pass_search_inode(pL, tmp, pino);
}

static u32
jffs2_1pass_search_list_inodes(struct b_lists * pL, const char *fname, u32 pino)
{
	int i;
	char tmp[256];
	char working_tmp[256];
	char *c;

	/* discard any leading slash */
	i = 0;
	while (fname[i] == '/')
		i++;
	strcpy(tmp, &fname[i]);
	working_tmp[0] = '\0';
	while ((c = (char *) strchr(tmp, '/')))	/* we are still dired searching */
	{
		strncpy(working_tmp, tmp, c - tmp);
		working_tmp[c - tmp] = '\0';
		for (i = 0; i < strlen(c) - 1; i++)
			tmp[i] = c[i + 1];
		tmp[i] = '\0';
		/* only a failure if we arent looking at top level */
		if (!(pino = jffs2_1pass_find_inode(pL, working_tmp, pino)) &&
		    (working_tmp[0])) {
			putstr("find_inode failed for name=");
			putstr(working_tmp);
			putstr("\r\n");
			return 0;
		}
	}

	if (tmp[0] && !(pino = jffs2_1pass_find_inode(pL, tmp, pino))) {
		putstr("find_inode failed for name=");
		putstr(tmp);
		putstr("\r\n");
		return 0;
	}
	/* this is for the bare filename, directories have already been mapped */
	if (!(pino = jffs2_1pass_list_inodes(pL, pino))) {
		putstr("find_inode failed for name=");
		putstr(tmp);
		putstr("\r\n");
		return 0;
	}
	return pino;

}

unsigned char
jffs2_1pass_rescan_needed(struct part_info *part)
{
	struct b_node *b;
	struct jffs2_unknown_node onode;
	struct jffs2_unknown_node *node;
	struct b_lists *pL = (struct b_lists *)part->jffs2_priv;

	if (part->jffs2_priv == 0){
		DEBUGF ("rescan: First time in use\n");
		return 1;
	}
	/* if we have no list, we need to rescan */
	if (pL->frag.listCount == 0) {
		DEBUGF ("rescan: fraglist zero\n");
		return 1;
	}

	/* or if we are scanning a new partition */
	if (pL->partOffset != part->offset) {
		DEBUGF ("rescan: different partition\n");
		return 1;
	}

	/* FIXME */
#if 0
	/* but suppose someone reflashed a partition at the same offset... */
	b = pL->dir.listHead;
	while (b) {
		node = (struct jffs2_unknown_node *) get_fl_mem(b->offset,
			sizeof(onode), &onode);
		if (node->nodetype != JFFS2_NODETYPE_DIRENT) {
			DEBUGF ("rescan: fs changed beneath me? (%lx)\n",
					(unsigned long) b->offset);
			return 1;
		}
		b = b->next;
	}
#endif
	return 0;
}

#ifdef DEBUG_FRAGMENTS
static void
dump_fragments(struct b_lists *pL)
{
	struct b_node *b;
	struct jffs2_raw_inode ojNode;
	struct jffs2_raw_inode *jNode;

	putstr("\r\n\r\n******The fragment Entries******\r\n");
	b = pL->frag.listHead;
	while (b) {
		jNode = (struct jffs2_raw_inode *) get_fl_mem(b->offset,
			sizeof(ojNode), &ojNode);
		putLabeledWord("\r\n\tbuild_list: FLASH_OFFSET = ", b->offset);
		putLabeledWord("\tbuild_list: totlen = ", jNode->totlen);
		putLabeledWord("\tbuild_list: inode = ", jNode->ino);
		putLabeledWord("\tbuild_list: version = ", jNode->version);
		putLabeledWord("\tbuild_list: isize = ", jNode->isize);
		putLabeledWord("\tbuild_list: atime = ", jNode->atime);
		putLabeledWord("\tbuild_list: offset = ", jNode->offset);
		putLabeledWord("\tbuild_list: csize = ", jNode->csize);
		putLabeledWord("\tbuild_list: dsize = ", jNode->dsize);
		putLabeledWord("\tbuild_list: compr = ", jNode->compr);
		putLabeledWord("\tbuild_list: usercompr = ", jNode->usercompr);
		putLabeledWord("\tbuild_list: flags = ", jNode->flags);
		putLabeledWord("\tbuild_list: offset = ", b->offset);	/* FIXME: ? [RS] */
		b = b->next;
	}
}
#endif

#ifdef DEBUG_DIRENTS
static void
dump_dirents(struct b_lists *pL)
{
	struct b_node *b;
	struct jffs2_raw_dirent *jDir;

	putstr("\r\n\r\n******The directory Entries******\r\n");
	b = pL->dir.listHead;
	while (b) {
		jDir = (struct jffs2_raw_dirent *) get_node_mem(b->offset);
		putstr("\r\n");
		putnstr(jDir->name, jDir->nsize);
		putLabeledWord("\r\n\tbuild_list: magic = ", jDir->magic);
		putLabeledWord("\tbuild_list: nodetype = ", jDir->nodetype);
		putLabeledWord("\tbuild_list: hdr_crc = ", jDir->hdr_crc);
		putLabeledWord("\tbuild_list: pino = ", jDir->pino);
		putLabeledWord("\tbuild_list: version = ", jDir->version);
		putLabeledWord("\tbuild_list: ino = ", jDir->ino);
		putLabeledWord("\tbuild_list: mctime = ", jDir->mctime);
		putLabeledWord("\tbuild_list: nsize = ", jDir->nsize);
		putLabeledWord("\tbuild_list: type = ", jDir->type);
		putLabeledWord("\tbuild_list: node_crc = ", jDir->node_crc);
		putLabeledWord("\tbuild_list: name_crc = ", jDir->name_crc);
		putLabeledWord("\tbuild_list: offset = ", b->offset); 	/* FIXME: ? [RS] */
		b = b->next;
		put_fl_mem(jDir);
	}
}
#endif

static int
jffs2_fill_scan_buf(nand_info_t *nand, unsigned char *buf,
		    unsigned ofs, unsigned len)
{
	int ret;
	unsigned olen;

	olen = len;
	ret = nand_read(nand, ofs, &olen, buf);
	if (ret) {
		printf("nand_read(0x%x bytes from 0x%x) returned %d\n", len, ofs, ret);
		return ret;
	}
	if (olen < len) {
		printf("Read at 0x%x gave only 0x%x bytes\n", ofs, olen);
		return -1;
	}
	return 0;
}

#define	EMPTY_SCAN_SIZE	1024
static u32
jffs2_1pass_build_lists(struct part_info * part)
{
	struct b_lists *pL;
	struct jffs2_unknown_node *node;
	unsigned nr_blocks, sectorsize, ofs, offset;
	char *buf;
	int i;
	u32 counter = 0;
	u32 counter4 = 0;
	u32 counterF = 0;
	u32 counterN = 0;

	struct mtdids *id = part->dev->id;
	nand = nand_info + id->num;

	/* if we are building a list we need to refresh the cache. */
	jffs_init_1pass_list(part);
	pL = (struct b_lists *)part->jffs2_priv;
	pL->partOffset = part->offset;
	puts ("Scanning JFFS2 FS:   ");

	sectorsize = nand->erasesize;
	nr_blocks = part->size / sectorsize;
	buf = malloc(sectorsize);
	if (!buf)
		return 0;

	for (i = 0; i < nr_blocks; i++) {
		printf("\b\b%c ", spinner[counter++ % sizeof(spinner)]);

		offset = part->offset + i * sectorsize;

		if (nand_block_isbad(nand, offset))
			continue;

		if (jffs2_fill_scan_buf(nand, buf, offset, EMPTY_SCAN_SIZE))
			return 0;

		ofs = 0;
		/* Scan only 4KiB of 0xFF before declaring it's empty */
		while (ofs < EMPTY_SCAN_SIZE && *(uint32_t *)(&buf[ofs]) == 0xFFFFFFFF)
			ofs += 4;
		if (ofs == EMPTY_SCAN_SIZE)
			continue;

		if (jffs2_fill_scan_buf(nand, buf + EMPTY_SCAN_SIZE, offset + EMPTY_SCAN_SIZE, sectorsize - EMPTY_SCAN_SIZE))
			return 0;
		offset += ofs;

		while (ofs < sectorsize - sizeof(struct jffs2_unknown_node)) {
			node = (struct jffs2_unknown_node *)&buf[ofs];
			if (node->magic != JFFS2_MAGIC_BITMASK || !hdr_crc(node)) {
				offset += 4;
				ofs += 4;
				counter4++;
				continue;
			}
			/* if its a fragment add it */
			if (node->nodetype == JFFS2_NODETYPE_INODE &&
				    inode_crc((struct jffs2_raw_inode *) node)) {
				if (insert_inode(&pL->frag, (struct jffs2_raw_inode *) node,
						 offset) == NULL) {
					return 0;
				}
			} else if (node->nodetype == JFFS2_NODETYPE_DIRENT &&
				   dirent_crc((struct jffs2_raw_dirent *) node)  &&
				   dirent_name_crc((struct jffs2_raw_dirent *) node)) {
				if (! (counterN%100))
					puts ("\b\b.  ");
				if (insert_dirent(&pL->dir, (struct jffs2_raw_dirent *) node,
						  offset) == NULL) {
					return 0;
				}
				counterN++;
			} else if (node->nodetype == JFFS2_NODETYPE_CLEANMARKER) {
				if (node->totlen != sizeof(struct jffs2_unknown_node))
					printf("OOPS Cleanmarker has bad size "
						"%d != %d\n", node->totlen,
						sizeof(struct jffs2_unknown_node));
			} else if (node->nodetype == JFFS2_NODETYPE_PADDING) {
				if (node->totlen < sizeof(struct jffs2_unknown_node))
					printf("OOPS Padding has bad size "
						"%d < %d\n", node->totlen,
						sizeof(struct jffs2_unknown_node));
			} else {
				printf("Unknown node type: %x len %d "
					"offset 0x%x\n", node->nodetype,
					node->totlen, offset);
			}
			offset += ((node->totlen + 3) & ~3);
			ofs += ((node->totlen + 3) & ~3);
			counterF++;
		}
	}

	putstr("\b\b done.\r\n");		/* close off the dots */

#if 0
	putLabeledWord("dir entries = ", pL->dir.listCount);
	putLabeledWord("frag entries = ", pL->frag.listCount);
	putLabeledWord("+4 increments = ", counter4);
	putLabeledWord("+file_offset increments = ", counterF);
#endif

#ifdef DEBUG_DIRENTS
	dump_dirents(pL);
#endif

#ifdef DEBUG_FRAGMENTS
	dump_fragments(pL);
#endif

	/* give visual feedback that we are done scanning the flash */
	led_blink(0x0, 0x0, 0x1, 0x1);	/* off, forever, on 100ms, off 100ms */
	free(buf);

	return 1;
}


static u32
jffs2_1pass_fill_info(struct b_lists * pL, struct b_jffs2_info * piL)
{
	struct b_node *b;
	struct jffs2_raw_inode ojNode;
	struct jffs2_raw_inode *jNode;
	int i;

	for (i = 0; i < JFFS2_NUM_COMPR; i++) {
		piL->compr_info[i].num_frags = 0;
		piL->compr_info[i].compr_sum = 0;
		piL->compr_info[i].decompr_sum = 0;
	}
/*	FIXME
	b = pL->frag.listHead;
	while (b) {
		jNode = (struct jffs2_raw_inode *) get_fl_mem(b->offset,
			sizeof(ojNode), &ojNode);
		if (jNode->compr < JFFS2_NUM_COMPR) {
			piL->compr_info[jNode->compr].num_frags++;
			piL->compr_info[jNode->compr].compr_sum += jNode->csize;
			piL->compr_info[jNode->compr].decompr_sum += jNode->dsize;
		}
		b = b->next;
	}
*/
	return 0;
}


static struct b_lists *
jffs2_get_list(struct part_info * part, const char *who)
{
	if (jffs2_1pass_rescan_needed(part)) {
		if (!jffs2_1pass_build_lists(part)) {
			printf("%s: Failed to scan JFFSv2 file structure\n", who);
			return NULL;
		}
	}
	return (struct b_lists *)part->jffs2_priv;
}


/* Print directory / file contents */
u32
jffs2_1pass_ls(struct part_info * part, const char *fname)
{
	struct b_lists *pl;
	long ret = 0;
	u32 inode;

	if (! (pl = jffs2_get_list(part, "ls")))
		return 0;

	if (! (inode = jffs2_1pass_search_list_inodes(pl, fname, 1))) {
		putstr("ls: Failed to scan jffs2 file structure\r\n");
		return 0;
	}

#if 0
	putLabeledWord("found file at inode = ", inode);
	putLabeledWord("read_inode returns = ", ret);
#endif

	return ret;
}


/* Load a file from flash into memory. fname can be a full path */
u32
jffs2_1pass_load(char *dest, struct part_info * part, const char *fname)
{

	struct b_lists *pl;
	long ret = 0;
	u32 inode;

	if (! (pl = jffs2_get_list(part, "load")))
		return 0;

	if (! (inode = jffs2_1pass_search_inode(pl, fname, 1))) {
		putstr("load: Failed to find inode\r\n");
		return 0;
	}

	/* Resolve symlinks */
	if (! (inode = jffs2_1pass_resolve_inode(pl, inode))) {
		putstr("load: Failed to resolve inode structure\r\n");
		return 0;
	}

	if ((ret = jffs2_1pass_read_inode(pl, inode, dest, NULL)) < 0) {
		putstr("load: Failed to read inode\r\n");
		return 0;
	}

	DEBUGF ("load: loaded '%s' to 0x%lx (%ld bytes)\n", fname,
				(unsigned long) dest, ret);
	return ret;
}

/* Return information about the fs on this partition */
u32
jffs2_1pass_info(struct part_info * part)
{
	struct b_jffs2_info info;
	struct b_lists *pl;
	int i;

	if (! (pl = jffs2_get_list(part, "info")))
		return 0;

	jffs2_1pass_fill_info(pl, &info);
	for (i = 0; i < JFFS2_NUM_COMPR; i++) {
		printf ("Compression: %s\n"
			"\tfrag count: %d\n"
			"\tcompressed sum: %d\n"
			"\tuncompressed sum: %d\n",
			compr_names[i],
			info.compr_info[i].num_frags,
			info.compr_info[i].compr_sum,
			info.compr_info[i].decompr_sum);
	}
	return 1;
}

#endif /* CFG_CMD_JFFS2 */