C++ cpu_to_je32函数代码示例

int jffs2_sum_add_dirent_mem(struct jffs2_summary *s, struct jffs2_raw_dirent *rd,
				uint32_t ofs)
{
	struct jffs2_sum_dirent_mem *temp =
		kmalloc(sizeof(struct jffs2_sum_dirent_mem) + rd->nsize, GFP_KERNEL);

	if (!temp)
		return -ENOMEM;

	temp->nodetype = rd->nodetype;
	temp->totlen = rd->totlen;
	temp->offset = cpu_to_je32(ofs);	/* relative from the begining of the jeb */
	temp->pino = rd->pino;
	temp->version = rd->version;
	temp->ino = rd->ino;
	temp->nsize = rd->nsize;
	temp->type = rd->type;
	temp->next = NULL;

	memcpy(temp->name, rd->name, rd->nsize);

	return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
}

static xattr_entry_t *create_xattr_entry(int xprefix, char *xname, char *xvalue, int value_len)
{
	xattr_entry_t *xe;
	struct jffs2_raw_xattr rx;
	int name_len;

	/* create xattr entry */
	name_len = strlen(xname);
	xe = xcalloc(1, sizeof(xattr_entry_t) + name_len + 1 + value_len);
	xe->next = NULL;
	xe->xid = ++highest_xid;
	xe->xprefix = xprefix;
	xe->xname = ((char *)xe) + sizeof(xattr_entry_t);
	xe->xvalue = xe->xname + name_len + 1;
	xe->name_len = name_len;
	xe->value_len = value_len;
	strcpy(xe->xname, xname);
	memcpy(xe->xvalue, xvalue, value_len);

	/* write xattr node */
	memset(&rx, 0, sizeof(rx));
	rx.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
	rx.nodetype = cpu_to_je16(JFFS2_NODETYPE_XATTR);
	rx.totlen = cpu_to_je32(PAD(sizeof(rx) + xe->name_len + 1 + xe->value_len));
	rx.hdr_crc = cpu_to_je32(crc32(0, &rx, sizeof(struct jffs2_unknown_node) - 4));

	rx.xid = cpu_to_je32(xe->xid);
	rx.version = cpu_to_je32(1);	/* initial version */
	rx.xprefix = xprefix;
	rx.name_len = xe->name_len;
	rx.value_len = cpu_to_je16(xe->value_len);
	rx.data_crc = cpu_to_je32(crc32(0, xe->xname, xe->name_len + 1 + xe->value_len));
	rx.node_crc = cpu_to_je32(crc32(0, &rx, sizeof(rx) - 4));

	pad_block_if_less_than(sizeof(rx) + xe->name_len + 1 + xe->value_len);
	full_write(out_fd, &rx, sizeof(rx));
	full_write(out_fd, xe->xname, xe->name_len + 1 + xe->value_len);
	padword();

	return xe;
}

static int jffs2_write_begin(struct file *filp, struct address_space *mapping,
			loff_t pos, unsigned len, unsigned flags,
			struct page **pagep, void **fsdata)
{
	struct page *pg;
	struct inode *inode = mapping->host;
	struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
	pgoff_t index = pos >> PAGE_CACHE_SHIFT;
	uint32_t pageofs = index << PAGE_CACHE_SHIFT;
	int ret = 0;

	pg = grab_cache_page_write_begin(mapping, index, flags);
	if (!pg)
		return -ENOMEM;
	*pagep = pg;

	jffs2_dbg(1, "%s()\n", __func__);

	if (pageofs > inode->i_size) {
		/* Make new hole frag from old EOF to new page */
		struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
		struct jffs2_raw_inode ri;
		struct jffs2_full_dnode *fn;
		uint32_t alloc_len;

		jffs2_dbg(1, "Writing new hole frag 0x%x-0x%x between current EOF and new page\n",
			  (unsigned int)inode->i_size, pageofs);

		ret = jffs2_reserve_space(c, sizeof(ri), &alloc_len,
					  ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
		if (ret)
			goto out_page;

		mutex_lock(&f->sem);
		memset(&ri, 0, sizeof(ri));

		ri.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
		ri.nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE);
		ri.totlen = cpu_to_je32(sizeof(ri));
		ri.hdr_crc = cpu_to_je32(crc32(0, &ri, sizeof(struct jffs2_unknown_node)-4));

		ri.ino = cpu_to_je32(f->inocache->ino);
		ri.version = cpu_to_je32(++f->highest_version);
		ri.mode = cpu_to_jemode(inode->i_mode);
		ri.uid = cpu_to_je16(inode->i_uid);
		ri.gid = cpu_to_je16(inode->i_gid);
		ri.isize = cpu_to_je32(max((uint32_t)inode->i_size, pageofs));
		ri.atime = ri.ctime = ri.mtime = cpu_to_je32(get_seconds());
		ri.offset = cpu_to_je32(inode->i_size);
		ri.dsize = cpu_to_je32(pageofs - inode->i_size);
		ri.csize = cpu_to_je32(0);
		ri.compr = JFFS2_COMPR_ZERO;
		ri.node_crc = cpu_to_je32(crc32(0, &ri, sizeof(ri)-8));
		ri.data_crc = cpu_to_je32(0);

		fn = jffs2_write_dnode(c, f, &ri, NULL, 0, ALLOC_NORMAL);

		if (IS_ERR(fn)) {
			ret = PTR_ERR(fn);
			jffs2_complete_reservation(c);
			mutex_unlock(&f->sem);
			goto out_page;
		}
		ret = jffs2_add_full_dnode_to_inode(c, f, fn);
		if (f->metadata) {
			jffs2_mark_node_obsolete(c, f->metadata->raw);
			jffs2_free_full_dnode(f->metadata);
			f->metadata = NULL;
		}
		if (ret) {
			jffs2_dbg(1, "Eep. add_full_dnode_to_inode() failed in write_begin, returned %d\n",
				  ret);
			jffs2_mark_node_obsolete(c, fn->raw);
			jffs2_free_full_dnode(fn);
			jffs2_complete_reservation(c);
			mutex_unlock(&f->sem);
			goto out_page;
		}
		jffs2_complete_reservation(c);
		inode->i_size = pageofs;
		mutex_unlock(&f->sem);
	}

	/*
	 * Read in the page if it wasn't already present. Cannot optimize away
	 * the whole page write case until jffs2_write_end can handle the
	 * case of a short-copy.
	 */
	if (!PageUptodate(pg)) {
		mutex_lock(&f->sem);
		ret = jffs2_do_readpage_nolock(inode, pg);
		mutex_unlock(&f->sem);
		if (ret)
			goto out_page;
	}
	jffs2_dbg(1, "end write_begin(). pg->flags %lx\n", pg->flags);
	return ret;

out_page:
	unlock_page(pg);
//.........这里部分代码省略.........

static void write_symlink(struct filesystem_entry *e)
{
	int len;
	struct stat *statbuf;
	struct jffs2_raw_inode ri;

	statbuf = &(e->sb);
	statbuf->st_ino = ++ino;
	mkfs_debug_msg("writing symlink '%s'  ino=%lu  parent_ino=%lu",
			e->name, (unsigned long) statbuf->st_ino,
			(unsigned long) e->parent->sb.st_ino);
	write_dirent(e);

	len = strlen(e->link);
	if (len > JFFS2_MAX_SYMLINK_LEN) {
		error_msg("symlink too large. Truncated to %d chars.",
				JFFS2_MAX_SYMLINK_LEN);
		len = JFFS2_MAX_SYMLINK_LEN;
	}

	memset(&ri, 0, sizeof(ri));

	ri.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
	ri.nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE);
	ri.totlen = cpu_to_je32(sizeof(ri) + len);
	ri.hdr_crc = cpu_to_je32(crc32(0,
				&ri, sizeof(struct jffs2_unknown_node) - 4));

	ri.ino = cpu_to_je32(statbuf->st_ino);
	ri.mode = cpu_to_jemode(statbuf->st_mode);
	ri.uid = cpu_to_je16(statbuf->st_uid);
	ri.gid = cpu_to_je16(statbuf->st_gid);
	ri.atime = cpu_to_je32(statbuf->st_atime);
	ri.ctime = cpu_to_je32(statbuf->st_ctime);
	ri.mtime = cpu_to_je32(statbuf->st_mtime);
	ri.isize = cpu_to_je32(statbuf->st_size);
	ri.version = cpu_to_je32(1);
	ri.csize = cpu_to_je32(len);
	ri.dsize = cpu_to_je32(len);
	ri.node_crc = cpu_to_je32(crc32(0, &ri, sizeof(ri) - 8));
	ri.data_crc = cpu_to_je32(crc32(0, e->link, len));

	pad_block_if_less_than(sizeof(ri) + len);
	full_write(out_fd, &ri, sizeof(ri));
	full_write(out_fd, e->link, len);
	padword();
}

static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, dev_t rdev)
{
	struct jffs2_inode_info *f, *dir_f;
	struct jffs2_sb_info *c;
	struct inode *inode;
	struct jffs2_raw_inode *ri;
	struct jffs2_raw_dirent *rd;
	struct jffs2_full_dnode *fn;
	struct jffs2_full_dirent *fd;
	int namelen;
	union jffs2_device_node dev;
	int devlen = 0;
	uint32_t alloclen;
	int ret;

	if (!new_valid_dev(rdev))
		return -EINVAL;

	ri = jffs2_alloc_raw_inode();
	if (!ri)
		return -ENOMEM;

	c = JFFS2_SB_INFO(dir_i->i_sb);

	if (S_ISBLK(mode) || S_ISCHR(mode))
		devlen = jffs2_encode_dev(&dev, rdev);

	/* Try to reserve enough space for both node and dirent.
	 * Just the node will do for now, though
	 */
	namelen = dentry->d_name.len;
	ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen,
				  ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);

	if (ret) {
		jffs2_free_raw_inode(ri);
		return ret;
	}

	inode = jffs2_new_inode(dir_i, mode, ri);

	if (IS_ERR(inode)) {
		jffs2_free_raw_inode(ri);
		jffs2_complete_reservation(c);
		return PTR_ERR(inode);
	}
	inode->i_op = &jffs2_file_inode_operations;
	init_special_inode(inode, inode->i_mode, rdev);

	f = JFFS2_INODE_INFO(inode);

	ri->dsize = ri->csize = cpu_to_je32(devlen);
	ri->totlen = cpu_to_je32(sizeof(*ri) + devlen);
	ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));

	ri->compr = JFFS2_COMPR_NONE;
	ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen));
	ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));

	fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL);

	jffs2_free_raw_inode(ri);

	if (IS_ERR(fn)) {
		/* Eeek. Wave bye bye */
		mutex_unlock(&f->sem);
		jffs2_complete_reservation(c);
		ret = PTR_ERR(fn);
		goto fail;
	}
	/* No data here. Only a metadata node, which will be
	   obsoleted by the first data write
	*/
	f->metadata = fn;
	mutex_unlock(&f->sem);

	jffs2_complete_reservation(c);

	ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
	if (ret)
		goto fail;

	ret = jffs2_init_acl_post(inode);
	if (ret)
		goto fail;

	ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
				  ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
	if (ret)
		goto fail;

	rd = jffs2_alloc_raw_dirent();
	if (!rd) {
		/* Argh. Now we treat it like a normal delete */
		jffs2_complete_reservation(c);
		ret = -ENOMEM;
		goto fail;
	}

	dir_f = JFFS2_INODE_INFO(dir_i);
//.........这里部分代码省略.........

int jffs2_commit_write (struct file *filp, struct page *pg, unsigned start, unsigned end)
{
	/* Actually commit the write from the page cache page we're looking at.
	 * For now, we write the full page out each time. It sucks, but it's simple
	 */
	struct inode *inode = pg->mapping->host;
	struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
	struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
	struct jffs2_raw_inode *ri;
	unsigned aligned_start = start & ~3;
	int ret = 0;
	uint32_t writtenlen = 0;

	D1(printk(KERN_DEBUG "jffs2_commit_write(): ino #%lu, page at 0x%lx, range %d-%d, flags %lx\n",
		  inode->i_ino, pg->index << PAGE_CACHE_SHIFT, start, end, pg->flags));

	if (!start && end == PAGE_CACHE_SIZE) {
		/* We need to avoid deadlock with page_cache_read() in
		   jffs2_garbage_collect_pass(). So we have to mark the
		   page up to date, to prevent page_cache_read() from 
		   trying to re-lock it. */
		SetPageUptodate(pg);
	}

	ri = jffs2_alloc_raw_inode();

	if (!ri) {
		D1(printk(KERN_DEBUG "jffs2_commit_write(): Allocation of raw inode failed\n"));
		return -ENOMEM;
	}

	/* Set the fields that the generic jffs2_write_inode_range() code can't find */
	ri->ino = cpu_to_je32(inode->i_ino);
	ri->mode = cpu_to_jemode(inode->i_mode);
	ri->uid = cpu_to_je16(inode->i_uid);
	ri->gid = cpu_to_je16(inode->i_gid);
	ri->isize = cpu_to_je32((uint32_t)inode->i_size);
	ri->atime = ri->ctime = ri->mtime = cpu_to_je32(get_seconds());

	/* In 2.4, it was already kmapped by generic_file_write(). Doesn't
	   hurt to do it again. The alternative is ifdefs, which are ugly. */
	kmap(pg);

	ret = jffs2_write_inode_range(c, f, ri, page_address(pg) + aligned_start,
				      (pg->index << PAGE_CACHE_SHIFT) + aligned_start,
				      end - aligned_start, &writtenlen);

	kunmap(pg);

	if (ret) {
		/* There was an error writing. */
		SetPageError(pg);
	}
	
	/* Adjust writtenlen for the padding we did, so we don't confuse our caller */
	if (writtenlen < (start&3))
		writtenlen = 0;
	else
		writtenlen -= (start&3);

	if (writtenlen) {
		if (inode->i_size < (pg->index << PAGE_CACHE_SHIFT) + start + writtenlen) {
			inode->i_size = (pg->index << PAGE_CACHE_SHIFT) + start + writtenlen;
			inode->i_blocks = (inode->i_size + 511) >> 9;
			
			inode->i_ctime = inode->i_mtime = ITIME(je32_to_cpu(ri->ctime));
		}
	}

static ssize_t rtems_jffs2_file_write(rtems_libio_t *iop, const void *buf, size_t len)
{
	struct _inode *inode = rtems_jffs2_get_inode_by_iop(iop);
	struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
	struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
	struct jffs2_raw_inode ri;
	uint32_t writtenlen;
	off_t pos;
	int eno = 0;

	memset(&ri, 0, sizeof(ri));

	ri.ino = cpu_to_je32(f->inocache->ino);
	ri.mode = cpu_to_jemode(inode->i_mode);
	ri.uid = cpu_to_je16(inode->i_uid);
	ri.gid = cpu_to_je16(inode->i_gid);
	ri.atime = ri.ctime = ri.mtime = cpu_to_je32(get_seconds());

	rtems_jffs2_do_lock(inode->i_sb);

	if ((iop->flags & LIBIO_FLAGS_APPEND) == 0) {
		pos = iop->offset;
	} else {
		pos = inode->i_size;
	}

	if (pos > inode->i_size) {
		ri.version = cpu_to_je32(++f->highest_version);
		eno = -jffs2_extend_file(inode, &ri, pos);
	}

	if (eno == 0) {
		ri.isize = cpu_to_je32(inode->i_size);

		eno = -jffs2_write_inode_range(c, f, &ri, (void *) buf, pos, len, &writtenlen);
	}

	if (eno == 0) {
		pos += writtenlen;

		inode->i_mtime = inode->i_ctime = je32_to_cpu(ri.mtime);

		if (pos > inode->i_size) {
			inode->i_size = pos;
		}

		iop->offset = pos;

		if (writtenlen != len) {
			eno = ENOSPC;
		}
	}

	rtems_jffs2_do_unlock(inode->i_sb);

	if (eno == 0) {
		return writtenlen;
	} else {
		errno = eno;

		return -1;
	}
}

static void write_special_file(struct filesystem_entry *e)
{
	jint16_t kdev;
	struct stat *statbuf;
	struct jffs2_raw_inode ri;

	statbuf = &(e->sb);
	statbuf->st_ino = ++ino;
	write_dirent(e);

	kdev = cpu_to_je16((major(statbuf->st_rdev) << 8) +
			minor(statbuf->st_rdev));

	memset(&ri, 0, sizeof(ri));

	ri.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
	ri.nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE);
	ri.totlen = cpu_to_je32(sizeof(ri) + sizeof(kdev));
	ri.hdr_crc = cpu_to_je32(crc32(0,
				&ri, sizeof(struct jffs2_unknown_node) - 4));

	ri.ino = cpu_to_je32(statbuf->st_ino);
	ri.mode = cpu_to_jemode(statbuf->st_mode);
	ri.uid = cpu_to_je16(statbuf->st_uid);
	ri.gid = cpu_to_je16(statbuf->st_gid);
	ri.atime = cpu_to_je32(statbuf->st_atime);
	ri.ctime = cpu_to_je32(statbuf->st_ctime);
	ri.mtime = cpu_to_je32(statbuf->st_mtime);
	ri.isize = cpu_to_je32(statbuf->st_size);
	ri.version = cpu_to_je32(1);
	ri.csize = cpu_to_je32(sizeof(kdev));
	ri.dsize = cpu_to_je32(sizeof(kdev));
	ri.node_crc = cpu_to_je32(crc32(0, &ri, sizeof(ri) - 8));
	ri.data_crc = cpu_to_je32(crc32(0, &kdev, sizeof(kdev)));

	pad_block_if_less_than(sizeof(ri) + sizeof(kdev));
	full_write(out_fd, &ri, sizeof(ri));
	full_write(out_fd, &kdev, sizeof(kdev));
	padword();
}

int main (int argc, char *argv[])
{
	mtd_info_t meminfo;
	int fd, clmpos = 0, clmlen = 8;
	erase_info_t erase;
	int isNAND, bbtest = 1;

	process_options(argc, argv);

	if ((fd = open(mtd_device, O_RDWR)) < 0) {
		fprintf(stderr, "%s: %s: %s\n", exe_name, mtd_device, strerror(errno));
		return 1;
	}


	if (ioctl(fd, MEMGETINFO, &meminfo) != 0) {
		fprintf(stderr, "%s: %s: unable to get MTD device info\n", exe_name, mtd_device);
		return 1;
	}

	erase.length = meminfo.erasesize;
	isNAND = meminfo.type == MTD_NANDFLASH ? 1 : 0;

	if (jffs2) {
		cleanmarker.magic = cpu_to_je16 (JFFS2_MAGIC_BITMASK);
		cleanmarker.nodetype = cpu_to_je16 (JFFS2_NODETYPE_CLEANMARKER);
		if (!isNAND)
			cleanmarker.totlen = cpu_to_je32 (sizeof (struct jffs2_unknown_node));
		else {
			struct nand_oobinfo oobinfo;

			if (ioctl(fd, MEMGETOOBSEL, &oobinfo) != 0) {
				fprintf(stderr, "%s: %s: unable to get NAND oobinfo\n", exe_name, mtd_device);
				return 1;
			}

			/* Check for autoplacement */
			if (oobinfo.useecc == MTD_NANDECC_AUTOPLACE) {
				/* Get the position of the free bytes */
				if (!oobinfo.oobfree[0][1]) {
					fprintf (stderr, " Eeep. Autoplacement selected and no empty space in oob\n");
					return 1;
				}
				clmpos = oobinfo.oobfree[0][0];
				clmlen = oobinfo.oobfree[0][1];
				if (clmlen > 8)
					clmlen = 8;
			} else {
				/* Legacy mode */
				switch (meminfo.oobsize) {
					case 8:
						clmpos = 6;
						clmlen = 2;
						break;
					case 16:
						clmpos = 8;
						clmlen = 8;
						break;
					case 64:
						clmpos = 16;
						clmlen = 8;
						break;
				}
			}
			cleanmarker.totlen = cpu_to_je32(8);
		}
		cleanmarker.hdr_crc =  cpu_to_je32 (crc32 (0, &cleanmarker,  sizeof (struct jffs2_unknown_node) - 4));
	}

	for (erase.start = 0; erase.start < meminfo.size; erase.start += meminfo.erasesize) {
		if (bbtest) {
			loff_t offset = erase.start;
			int ret = ioctl(fd, MEMGETBADBLOCK, &offset);
			if (ret > 0) {
				if (!quiet)
					printf ("\nSkipping bad block at 0x%08x\n", erase.start);
				continue;
			} else if (ret < 0) {
				if (errno == EOPNOTSUPP) {
					bbtest = 0;
					if (isNAND) {
						fprintf(stderr, "%s: %s: Bad block check not available\n", exe_name, mtd_device);
						return 1;
					}
				} else {
					fprintf(stderr, "\n%s: %s: MTD get bad block failed: %s\n", exe_name, mtd_device, strerror(errno));
					return 1;
				}
			}
		}

		if (!quiet)
			show_progress(&meminfo, &erase);

		if (ioctl(fd, MEMERASE, &erase) != 0) {
			fprintf(stderr, "\n%s: %s: MTD Erase failure: %s\n", exe_name, mtd_device, strerror(errno));
			continue;
		}

		/* format for JFFS2 ? */
//.........这里部分代码省略.........

void dump_sum_records()
{

	struct jffs2_raw_summary isum;
	struct jffs2_sum_marker *sm;
	union jffs2_sum_mem *temp;
	jint32_t offset;
	jint32_t *tpage;
	void *wpage;
	int datasize, infosize, padsize;
	jint32_t magic = cpu_to_je32(JFFS2_SUM_MAGIC);

	if (!sum_collected->sum_num || !sum_collected->sum_list_head)
		return;

	datasize = sum_collected->sum_size + sizeof(struct jffs2_sum_marker);
	infosize = sizeof(struct jffs2_raw_summary) + datasize;
	padsize = erase_block_size - data_ofs - infosize;
	infosize += padsize; datasize += padsize;
	offset = cpu_to_je32(data_ofs);

	tpage = (jint32_t *) malloc(datasize);

	if(!tpage)
		error_msg_and_die("Can't allocate memory to dump summary information!\n");

	memset(tpage, 0xff, datasize);
	memset(&isum, 0, sizeof(isum));

	isum.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
	isum.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY);
	isum.totlen = cpu_to_je32(infosize);
	isum.hdr_crc = cpu_to_je32(crc32(0, &isum, sizeof(struct jffs2_unknown_node) - 4));
	isum.padded = cpu_to_je32(0);

	if (add_cleanmarkers && found_cleanmarkers) {
		isum.cln_mkr = cpu_to_je32(cleanmarker_size);
	} else {
		isum.cln_mkr = cpu_to_je32(0);
	}

	isum.sum_num = cpu_to_je32(sum_collected->sum_num);
	wpage = tpage;

	while (sum_collected->sum_num) {
		switch(je16_to_cpu(sum_collected->sum_list_head->u.nodetype)) {

			case JFFS2_NODETYPE_INODE : {
											struct jffs2_sum_inode_flash *sino_ptr = wpage;

											sino_ptr->nodetype = sum_collected->sum_list_head->i.nodetype;
											sino_ptr->inode = sum_collected->sum_list_head->i.inode;
											sino_ptr->version = sum_collected->sum_list_head->i.version;
											sino_ptr->offset = sum_collected->sum_list_head->i.offset;
											sino_ptr->totlen = sum_collected->sum_list_head->i.totlen;

											wpage += JFFS2_SUMMARY_INODE_SIZE;
											break;
										}

			case JFFS2_NODETYPE_DIRENT : {
											 struct jffs2_sum_dirent_flash *sdrnt_ptr = wpage;

											 sdrnt_ptr->nodetype = sum_collected->sum_list_head->d.nodetype;
											 sdrnt_ptr->totlen = sum_collected->sum_list_head->d.totlen;
											 sdrnt_ptr->offset = sum_collected->sum_list_head->d.offset;
											 sdrnt_ptr->pino = sum_collected->sum_list_head->d.pino;
											 sdrnt_ptr->version = sum_collected->sum_list_head->d.version;
											 sdrnt_ptr->ino = sum_collected->sum_list_head->d.ino;
											 sdrnt_ptr->nsize = sum_collected->sum_list_head->d.nsize;
											 sdrnt_ptr->type = sum_collected->sum_list_head->d.type;

											 memcpy(sdrnt_ptr->name, sum_collected->sum_list_head->d.name,
													 sum_collected->sum_list_head->d.nsize);

											 wpage += JFFS2_SUMMARY_DIRENT_SIZE(sum_collected->sum_list_head->d.nsize);
											 break;
										 }

			case JFFS2_NODETYPE_XATTR: {
										   struct jffs2_sum_xattr_flash *sxattr_ptr = wpage;

										   sxattr_ptr->nodetype = sum_collected->sum_list_head->x.nodetype;
										   sxattr_ptr->xid = sum_collected->sum_list_head->x.xid;
										   sxattr_ptr->version = sum_collected->sum_list_head->x.version;
										   sxattr_ptr->offset = sum_collected->sum_list_head->x.offset;
										   sxattr_ptr->totlen = sum_collected->sum_list_head->x.totlen;

										   wpage += JFFS2_SUMMARY_XATTR_SIZE;
										   break;
									   }

			case JFFS2_NODETYPE_XREF: {
										  struct jffs2_sum_xref_flash *sxref_ptr = wpage;

										  sxref_ptr->nodetype = sum_collected->sum_list_head->r.nodetype;
										  sxref_ptr->offset = sum_collected->sum_list_head->r.offset;

										  wpage += JFFS2_SUMMARY_XREF_SIZE;
										  break;
//.........这里部分代码省略.........

static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode)
{
	struct jffs2_inode_info *f, *dir_f;
	struct jffs2_sb_info *c;
	struct inode *inode;
	struct jffs2_raw_inode *ri;
	struct jffs2_raw_dirent *rd;
	struct jffs2_full_dnode *fn;
	struct jffs2_full_dirent *fd;
	int namelen;
	uint32_t alloclen, phys_ofs;
	uint32_t writtenlen;
	int ret;

	mode |= S_IFDIR;

	ri = jffs2_alloc_raw_inode();
	if (!ri)
		return -ENOMEM;
	
	c = JFFS2_SB_INFO(dir_i->i_sb);

	/* Try to reserve enough space for both node and dirent. 
	 * Just the node will do for now, though 
	 */
	namelen = dentry->d_name.len;
	ret = jffs2_reserve_space(c, sizeof(*ri), &phys_ofs, &alloclen, ALLOC_NORMAL);

	if (ret) {
		jffs2_free_raw_inode(ri);
		return ret;
	}

	inode = jffs2_new_inode(dir_i, mode, ri);

	if (IS_ERR(inode)) {
		jffs2_free_raw_inode(ri);
		jffs2_complete_reservation(c);
		return PTR_ERR(inode);
	}

	inode->i_op = &jffs2_dir_inode_operations;
	inode->i_fop = &jffs2_dir_operations;
	/* Directories get nlink 2 at start */
	inode->i_nlink = 2;

	f = JFFS2_INODE_INFO(inode);

	ri->data_crc = cpu_to_je32(0);
	ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
	
	fn = jffs2_write_dnode(c, f, ri, NULL, 0, phys_ofs, &writtenlen);

	jffs2_free_raw_inode(ri);

	if (IS_ERR(fn)) {
		/* Eeek. Wave bye bye */
		up(&f->sem);
		jffs2_complete_reservation(c);
		jffs2_clear_inode(inode);
		return PTR_ERR(fn);
	}
	/* No data here. Only a metadata node, which will be 
	   obsoleted by the first data write
	*/
	f->metadata = fn;
	up(&f->sem);

	/* Work out where to put the dirent node now. */
	writtenlen = PAD(writtenlen);
	phys_ofs += writtenlen;
	alloclen -= writtenlen;

	if (alloclen < sizeof(*rd)+namelen) {
		/* Not enough space left in this chunk. Get some more */
		jffs2_complete_reservation(c);
		ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL);
		if (ret) {
			/* Eep. */
			jffs2_clear_inode(inode);
			return ret;
		}
	}
	
	rd = jffs2_alloc_raw_dirent();
	if (!rd) {
		/* Argh. Now we treat it like a normal delete */
		jffs2_complete_reservation(c);
		jffs2_clear_inode(inode);
		return -ENOMEM;
	}

	dir_f = JFFS2_INODE_INFO(dir_i);
	down(&dir_f->sem);

	rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
	rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
	rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
	rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));

//.........这里部分代码省略.........

static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, mknod_arg_t rdev)
{
	struct jffs2_inode_info *f, *dir_f;
	struct jffs2_sb_info *c;
	struct inode *inode;
	struct jffs2_raw_inode *ri;
	struct jffs2_raw_dirent *rd;
	struct jffs2_full_dnode *fn;
	struct jffs2_full_dirent *fd;
	int namelen;
	unsigned short dev;
	int devlen = 0;
	uint32_t alloclen, phys_ofs;
	uint32_t writtenlen;
	int ret;

	ri = jffs2_alloc_raw_inode();
	if (!ri)
		return -ENOMEM;
	
	c = JFFS2_SB_INFO(dir_i->i_sb);
	
	if (S_ISBLK(mode) || S_ISCHR(mode)) {
		dev = (MAJOR(rdev) << 8) | MINOR(rdev);
		devlen = sizeof(dev);
	}
	
	/* Try to reserve enough space for both node and dirent. 
	 * Just the node will do for now, though 
	 */
	namelen = dentry->d_name.len;
	ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &phys_ofs, &alloclen, ALLOC_NORMAL);

	if (ret) {
		jffs2_free_raw_inode(ri);
		return ret;
	}

	inode = jffs2_new_inode(dir_i, mode, ri);

	if (IS_ERR(inode)) {
		jffs2_free_raw_inode(ri);
		jffs2_complete_reservation(c);
		return PTR_ERR(inode);
	}
	inode->i_op = &jffs2_file_inode_operations;
	init_special_inode(inode, inode->i_mode, rdev);

	f = JFFS2_INODE_INFO(inode);

	ri->dsize = ri->csize = cpu_to_je32(devlen);
	ri->totlen = cpu_to_je32(sizeof(*ri) + devlen);
	ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));

	ri->compr = JFFS2_COMPR_NONE;
	ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen));
	ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
	
	fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, phys_ofs, &writtenlen);

	jffs2_free_raw_inode(ri);

	if (IS_ERR(fn)) {
		/* Eeek. Wave bye bye */
		up(&f->sem);
		jffs2_complete_reservation(c);
		jffs2_clear_inode(inode);
		return PTR_ERR(fn);
	}
	/* No data here. Only a metadata node, which will be 
	   obsoleted by the first data write
	*/
	f->metadata = fn;
	up(&f->sem);

	/* Work out where to put the dirent node now. */
	writtenlen = (writtenlen+3)&~3;
	phys_ofs += writtenlen;
	alloclen -= writtenlen;

	if (alloclen < sizeof(*rd)+namelen) {
		/* Not enough space left in this chunk. Get some more */
		jffs2_complete_reservation(c);
		ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL);
		if (ret) {
			/* Eep. */
			jffs2_clear_inode(inode);
			return ret;
		}
	}

	rd = jffs2_alloc_raw_dirent();
	if (!rd) {
		/* Argh. Now we treat it like a normal delete */
		jffs2_complete_reservation(c);
		jffs2_clear_inode(inode);
		return -ENOMEM;
	}

	dir_f = JFFS2_INODE_INFO(dir_i);
//.........这里部分代码省略.........

int flash_eraseall_main(int argc, char **argv)
{
    struct jffs2_unknown_node oob_cleanmarker;
    mtd_info_t meminfo;
    int fd, clmpos, clmlen;
    erase_info_t erase;
    struct stat st;
    unsigned int flags;
    char *mtd_name;

//    flags = BBTEST | bb_getopt_ulflags(argc, argv, "jqre");
    flags = BBTEST | getopt32(argv,"jqre");

    mtd_name = argv[optind];

    stat(mtd_name, &st);
    if (!S_ISCHR(st.st_mode))
        bb_error_msg_and_die("%s: not a char device", mtd_name);

    fd = bb_xopen(mtd_name, O_RDWR);

    ioctl(fd, MEMGETINFO, &meminfo);
    erase.length = meminfo.erasesize;
    if (meminfo.type == MTD_NANDFLASH)
        flags |= IS_NAND;

    clmpos = 0;
    clmlen = 8;
    if (flags & OPTION_J) {

        oob_cleanmarker.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
        oob_cleanmarker.nodetype = cpu_to_je16(JFFS2_NODETYPE_CLEANMARKER);
        oob_cleanmarker.totlen = cpu_to_je32(8);
        oob_cleanmarker.hdr_crc = cpu_to_je32(0);

        if (!(flags & IS_NAND))
            oob_cleanmarker.totlen = cpu_to_je32(sizeof(struct jffs2_unknown_node));
        else {
            struct k_nand_ecclayout ecclayout;

            ioctl(fd, ECCGETLAYOUT, &ecclayout);
            clmlen = ecclayout.oobavail;
            clmpos = 0;
        }
    }

    /* Don't want to destroy progress indicator by bb_error_msg's */
    printf("\nflash_eraseall: %s", mtd_name);

    for (erase.start = 0; erase.start < meminfo.size;
         erase.start += meminfo.erasesize) {
        if (flags & BBTEST) {
            int ret;
            loff_t offset = erase.start;

            ret = ioctl(fd, MEMGETBADBLOCK, &offset);
            if (ret > 0) {
                if (!(flags & OPTION_Q))
                    printf("\nSkipping bad block at 0x%08x", erase.start);
                continue;
            }
            if (ret < 0) {
                /* Black block table is not available on certain flash
                 * types e.g. NOR
                 */
                if (errno == EOPNOTSUPP) {
                    flags = ~BBTEST;
                    if (flags & IS_NAND)
                        bb_error_msg_and_die("bad block check not available");
                } else {
                    bb_perror_msg_and_die("MEMGETBADBLOCK error");
                }
            }
        }

        if (!(flags & OPTION_Q))
            show_progress(&meminfo, &erase);

        if (!(flags & OPTION_E))
            ioctl(fd, MEMERASE, &erase);

        /* format for JFFS2 ? */
        if (!(flags & OPTION_J))
            continue;

        /* write cleanmarker */
        if (flags & IS_NAND) {
            struct mtd_oob_buf oob;

            oob.ptr = (unsigned char *) &oob_cleanmarker;
            oob.start = erase.start + clmpos;
            oob.length = clmlen;
#if 0 /* TESTING */
            printf("W %8.8lx %lu - %8.8lx %8.8lx %8.8lx\n",
                (unsigned long) oob.start, (unsigned long) oob.length,
                *((unsigned long *) &oob_cleanmarker + 0),
                *((unsigned long *) &oob_cleanmarker + 1),
                *((unsigned long *) &oob_cleanmarker + 2));
#endif
            ioctl(fd, MEMWRITEOOB, &oob);
//.........这里部分代码省略.........

int main (int argc, char *argv[])
{
	libmtd_t mtd_desc;
	struct mtd_dev_info mtd;
	int fd, clmpos = 0, clmlen = 8, eb;
	int isNAND, bbtest = 1;
	int error = 0;
	uint64_t offset = 0;

	exe_name = argv[0];
	for (;;) {
		int option_index = 0;
		static const char *short_options = "jq";
		static const struct option long_options[] = {
			{"help", no_argument, 0, 0},
			{"version", no_argument, 0, 0},
			{"jffs2", no_argument, 0, 'j'},
			{"quiet", no_argument, 0, 'q'},
			{"silent", no_argument, 0, 'q'},

			{0, 0, 0, 0},
		};

		int c = getopt_long(argc, argv, short_options,
				long_options, &option_index);
		if (c == EOF)
			break;

		switch (c) {
		case 0:
			switch (option_index) {
			case 0:
				display_help();
				return 0;
			case 1:
				display_version();
				return 0;
			}
			break;
		case 'q':
			quiet = 1;
			break;
		case 'j':
			jffs2 = 1;
			break;
		case '?':
			error = 1;
			break;
		}
	}
	if (optind == argc) {
		fprintf(stderr, "%s: no MTD device specified\n", exe_name);
		error = 1;
	}
	if (error) {
		fprintf(stderr, "Try `%s --help' for more information.\n",
				exe_name);
		return 1;
	}
	mtd_device = argv[optind];

	mtd_desc = libmtd_open();
	if (mtd_desc == NULL) {
		fprintf(stderr, "%s: can't initialize libmtd\n", exe_name);
		return 1;
	}

	if ((fd = open(mtd_device, O_RDWR)) < 0) {
		fprintf(stderr, "%s: %s: %s\n", exe_name, mtd_device, strerror(errno));
		return 1;
	}

	if (mtd_get_dev_info(mtd_desc, mtd_device, &mtd) < 0) {
		fprintf(stderr, "%s: mtd_get_dev_info failed\n", exe_name);
		return 1;
	}

	isNAND = mtd.type == MTD_NANDFLASH ? 1 : 0;

	if (jffs2) {
		cleanmarker.magic = cpu_to_je16 (JFFS2_MAGIC_BITMASK);
		cleanmarker.nodetype = cpu_to_je16 (JFFS2_NODETYPE_CLEANMARKER);
		if (!isNAND)
			cleanmarker.totlen = cpu_to_je32 (sizeof (struct jffs2_unknown_node));
		else {
			struct nand_oobinfo oobinfo;

			if (ioctl(fd, MEMGETOOBSEL, &oobinfo) != 0) {
				fprintf(stderr, "%s: %s: unable to get NAND oobinfo\n", exe_name, mtd_device);
				return 1;
			}

			/* Check for autoplacement */
			if (oobinfo.useecc == MTD_NANDECC_AUTOPLACE) {
				/* Get the position of the free bytes */
				if (!oobinfo.oobfree[0][1]) {
					fprintf (stderr, " Eeep. Autoplacement selected and no empty space in oob\n");
					return 1;
				}
				clmpos = oobinfo.oobfree[0][0];
//.........这里部分代码省略.........

//.........这里部分代码省略.........
	case 0:
		errmsg("no MTD device specified");
	case 1:
		errmsg("no start erase block specified");
	case 2:
		errmsg("no erase block count specified");
		error = 1;
		break;
	}
	if (error)
		return errmsg("Try `--help' for more information");

	/*
	 * Locate MTD and prepare for erasure
	 */
	mtd_desc = libmtd_open();
	if (mtd_desc == NULL)
		return errmsg("can't initialize libmtd");

	if ((fd = open(mtd_device, O_RDWR)) < 0)
		return sys_errmsg("%s", mtd_device);

	if (mtd_get_dev_info(mtd_desc, mtd_device, &mtd) < 0)
		return errmsg("mtd_get_dev_info failed");

	eb_start = start / mtd.eb_size;

	isNAND = mtd.type == MTD_NANDFLASH ? 1 : 0;

	if (jffs2) {
		cleanmarker.magic = cpu_to_je16 (JFFS2_MAGIC_BITMASK);
		cleanmarker.nodetype = cpu_to_je16 (JFFS2_NODETYPE_CLEANMARKER);
		if (!isNAND)
			cleanmarker.totlen = cpu_to_je32(sizeof(cleanmarker));
		else {
			struct nand_oobinfo oobinfo;

			if (ioctl(fd, MEMGETOOBSEL, &oobinfo) != 0)
				return sys_errmsg("%s: unable to get NAND oobinfo", mtd_device);

			/* Check for autoplacement */
			if (oobinfo.useecc == MTD_NANDECC_AUTOPLACE) {
				/* Get the position of the free bytes */
				if (!oobinfo.oobfree[0][1])
					return errmsg(" Eeep. Autoplacement selected and no empty space in oob");
				clmpos = oobinfo.oobfree[0][0];
				clmlen = oobinfo.oobfree[0][1];
				if (clmlen > 8)
					clmlen = 8;
			} else {
				/* Legacy mode */
				switch (mtd.oob_size) {
					case 8:
						clmpos = 6;
						clmlen = 2;
						break;
					case 16:
						clmpos = 8;
						clmlen = 8;
						break;
					case 64:
						clmpos = 16;
						clmlen = 8;
						break;
				}
			}