[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / jffs2 / summary.c

/*
 * JFFS2 -- Journalling Flash File System, Version 2.
 *
 * Copyright (C) 2004  Ferenc Havasi <havasi@inf.u-szeged.hu>,
 *                     Zoltan Sogor <weth@inf.u-szeged.hu>,
 *                     Patrik Kluba <pajko@halom.u-szeged.hu>,
 *                     University of Szeged, Hungary
 *
 * For licensing information, see the file 'LICENCE' in this directory.
 *
 * $Id: summary.c,v 1.4 2005/09/26 11:37:21 havasi Exp $
 *
 */

#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 <linux/vmalloc.h>
#include "nodelist.h"
#include "debug.h"

int jffs2_sum_init(struct jffs2_sb_info *c)
{
	c->summary = kmalloc(sizeof(struct jffs2_summary), GFP_KERNEL);

	if (!c->summary) {
		JFFS2_WARNING("Can't allocate memory for summary information!\n");
		return -ENOMEM;
	}

	memset(c->summary, 0, sizeof(struct jffs2_summary));

	c->summary->sum_buf = vmalloc(c->sector_size);

	if (!c->summary->sum_buf) {
		JFFS2_WARNING("Can't allocate buffer for writing out summary information!\n");
		kfree(c->summary);
		return -ENOMEM;
	}

	dbg_summary("returned succesfully\n");

	return 0;
}

void jffs2_sum_exit(struct jffs2_sb_info *c)
{
	dbg_summary("called\n");

	jffs2_sum_disable_collecting(c->summary);

	vfree(c->summary->sum_buf);
	c->summary->sum_buf = NULL;

	kfree(c->summary);
	c->summary = NULL;
}

static int jffs2_sum_add_mem(struct jffs2_summary *s, union jffs2_sum_mem *item)
{
	if (!s->sum_list_head)
		s->sum_list_head = (union jffs2_sum_mem *) item;
	if (s->sum_list_tail)
		s->sum_list_tail->u.next = (union jffs2_sum_mem *) item;
	s->sum_list_tail = (union jffs2_sum_mem *) item;

	switch (je16_to_cpu(item->u.nodetype)) {
		case JFFS2_NODETYPE_INODE:
			s->sum_size += JFFS2_SUMMARY_INODE_SIZE;
			s->sum_num++;
			dbg_summary("inode (%u) added to summary\n",
						je32_to_cpu(item->i.inode));
			break;
		case JFFS2_NODETYPE_DIRENT:
			s->sum_size += JFFS2_SUMMARY_DIRENT_SIZE(item->d.nsize);
			s->sum_num++;
			dbg_summary("dirent (%u) added to summary\n",
						je32_to_cpu(item->d.ino));
			break;
		default:
			JFFS2_WARNING("UNKNOWN node type %u\n",
					    je16_to_cpu(item->u.nodetype));
			return 1;
	}
	return 0;
}


/* The following 3 functions are called from scan.c to collect summary info for not closed jeb */

int jffs2_sum_add_padding_mem(struct jffs2_summary *s, uint32_t size)
{
	dbg_summary("called with %u\n", size);
	s->sum_padded += size;
	return 0;
}

int jffs2_sum_add_inode_mem(struct jffs2_summary *s, struct jffs2_raw_inode *ri,
				uint32_t ofs)
{
	struct jffs2_sum_inode_mem *temp = kmalloc(sizeof(struct jffs2_sum_inode_mem), GFP_KERNEL);

	if (!temp)
		return -ENOMEM;

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

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

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);
}

/* Cleanup every collected summary information */

static void jffs2_sum_clean_collected(struct jffs2_summary *s)
{
	union jffs2_sum_mem *temp;

	if (!s->sum_list_head) {
		dbg_summary("already empty\n");
	}
	while (s->sum_list_head) {
		temp = s->sum_list_head;
		s->sum_list_head = s->sum_list_head->u.next;
		kfree(temp);
	}
	s->sum_list_tail = NULL;
	s->sum_padded = 0;
	s->sum_num = 0;
}

void jffs2_sum_reset_collected(struct jffs2_summary *s)
{
	dbg_summary("called\n");
	jffs2_sum_clean_collected(s);
	s->sum_size = 0;
}

void jffs2_sum_disable_collecting(struct jffs2_summary *s)
{
	dbg_summary("called\n");
	jffs2_sum_clean_collected(s);
	s->sum_size = JFFS2_SUMMARY_NOSUM_SIZE;
}

int jffs2_sum_is_disabled(struct jffs2_summary *s)
{
	return (s->sum_size == JFFS2_SUMMARY_NOSUM_SIZE);
}

/* Move the collected summary information into sb (called from scan.c) */

void jffs2_sum_move_collected(struct jffs2_sb_info *c, struct jffs2_summary *s)
{
	dbg_summary("oldsize=0x%x oldnum=%u => newsize=0x%x newnum=%u\n",
				c->summary->sum_size, c->summary->sum_num,
				s->sum_size, s->sum_num);

	c->summary->sum_size = s->sum_size;
	c->summary->sum_num = s->sum_num;
	c->summary->sum_padded = s->sum_padded;
	c->summary->sum_list_head = s->sum_list_head;
	c->summary->sum_list_tail = s->sum_list_tail;

	s->sum_list_head = s->sum_list_tail = NULL;
}

/* Called from wbuf.c to collect writed node info */

int jffs2_sum_add_kvec(struct jffs2_sb_info *c, const struct kvec *invecs,
				unsigned long count, uint32_t ofs)
{
	union jffs2_node_union *node;
	struct jffs2_eraseblock *jeb;

	node = invecs[0].iov_base;
	jeb = &c->blocks[ofs / c->sector_size];
	ofs -= jeb->offset;

	switch (je16_to_cpu(node->u.nodetype)) {
		case JFFS2_NODETYPE_INODE: {
			struct jffs2_sum_inode_mem *temp =
				kmalloc(sizeof(struct jffs2_sum_inode_mem), GFP_KERNEL);

			if (!temp)
				goto no_mem;

			temp->nodetype = node->i.nodetype;
			temp->inode = node->i.ino;
			temp->version = node->i.version;
			temp->offset = cpu_to_je32(ofs);
			temp->totlen = node->i.totlen;
			temp->next = NULL;

			return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
		}

		case JFFS2_NODETYPE_DIRENT: {
			struct jffs2_sum_dirent_mem *temp =
				kmalloc(sizeof(struct jffs2_sum_dirent_mem) + node->d.nsize, GFP_KERNEL);

			if (!temp)
				goto no_mem;

			temp->nodetype = node->d.nodetype;
			temp->totlen = node->d.totlen;
			temp->offset = cpu_to_je32(ofs);
			temp->pino = node->d.pino;
			temp->version = node->d.version;
			temp->ino = node->d.ino;
			temp->nsize = node->d.nsize;
			temp->type = node->d.type;
			temp->next = NULL;

			switch (count) {
				case 1:
					memcpy(temp->name,node->d.name,node->d.nsize);
					break;

				case 2:
					memcpy(temp->name,invecs[1].iov_base,node->d.nsize);
					break;

				default:
					BUG();	/* impossible count value */
					break;
			}

			return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
		}

		case JFFS2_NODETYPE_PADDING:
			dbg_summary("node PADDING\n");
			c->summary->sum_padded += je32_to_cpu(node->u.totlen);
			break;

		case JFFS2_NODETYPE_CLEANMARKER:
			dbg_summary("node CLEANMARKER\n");
			break;

		case JFFS2_NODETYPE_SUMMARY:
			dbg_summary("node SUMMARY\n");
			break;

		default:
			/* If you implement a new node type you should also implement
			   summary support for it or disable summary.
			*/
			BUG();
			break;
	}

	return 0;

no_mem:
	JFFS2_WARNING("MEMORY ALLOCATION ERROR!");
	return -ENOMEM;
}


/* Process the stored summary information - helper function for jffs2_sum_scan_sumnode() */

static int jffs2_sum_process_sum_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
				struct jffs2_raw_summary *summary, uint32_t *pseudo_random)
{
	struct jffs2_raw_node_ref *raw;
	struct jffs2_inode_cache *ic;
	struct jffs2_full_dirent *fd;
	void *sp;
	int i, ino;

	sp = summary->sum;

	for (i=0; i<je32_to_cpu(summary->sum_num); i++) {
		dbg_summary("processing summary index %d\n", i);

		switch (je16_to_cpu(((struct jffs2_sum_unknown_flash *)sp)->nodetype)) {
			case JFFS2_NODETYPE_INODE: {
				struct jffs2_sum_inode_flash *spi;
				spi = sp;

				ino = je32_to_cpu(spi->inode);

				dbg_summary("Inode at 0x%08x\n",
							jeb->offset + je32_to_cpu(spi->offset));

				raw = jffs2_alloc_raw_node_ref();
				if (!raw) {
					JFFS2_NOTICE("allocation of node reference failed\n");
					kfree(summary);
					return -ENOMEM;
				}

				ic = jffs2_scan_make_ino_cache(c, ino);
				if (!ic) {
					JFFS2_NOTICE("scan_make_ino_cache failed\n");
					jffs2_free_raw_node_ref(raw);
					kfree(summary);
					return -ENOMEM;
				}

				raw->flash_offset = (jeb->offset + je32_to_cpu(spi->offset)) | REF_UNCHECKED;
				raw->__totlen = PAD(je32_to_cpu(spi->totlen));
				raw->next_phys = NULL;
				raw->next_in_ino = ic->nodes;

				ic->nodes = raw;
				if (!jeb->first_node)
					jeb->first_node = raw;
				if (jeb->last_node)
					jeb->last_node->next_phys = raw;
				jeb->last_node = raw;
				*pseudo_random += je32_to_cpu(spi->version);

				UNCHECKED_SPACE(PAD(je32_to_cpu(spi->totlen)));

				sp += JFFS2_SUMMARY_INODE_SIZE;

				break;
			}

			case JFFS2_NODETYPE_DIRENT: {
				struct jffs2_sum_dirent_flash *spd;
				spd = sp;

				dbg_summary("Dirent at 0x%08x\n",
							jeb->offset + je32_to_cpu(spd->offset));

				fd = jffs2_alloc_full_dirent(spd->nsize+1);
				if (!fd) {
					kfree(summary);
					return -ENOMEM;
				}

				memcpy(&fd->name, spd->name, spd->nsize);
				fd->name[spd->nsize] = 0;

				raw = jffs2_alloc_raw_node_ref();
				if (!raw) {
					jffs2_free_full_dirent(fd);
					JFFS2_NOTICE("allocation of node reference failed\n");
					kfree(summary);
					return -ENOMEM;
				}

				ic = jffs2_scan_make_ino_cache(c, je32_to_cpu(spd->pino));
				if (!ic) {
					jffs2_free_full_dirent(fd);
					jffs2_free_raw_node_ref(raw);
					kfree(summary);
					return -ENOMEM;
				}

				raw->__totlen = PAD(je32_to_cpu(spd->totlen));
				raw->flash_offset = (jeb->offset + je32_to_cpu(spd->offset)) | REF_PRISTINE;
				raw->next_phys = NULL;
				raw->next_in_ino = ic->nodes;
				ic->nodes = raw;
				if (!jeb->first_node)
					jeb->first_node = raw;
				if (jeb->last_node)
					jeb->last_node->next_phys = raw;
				jeb->last_node = raw;

				fd->raw = raw;
				fd->next = NULL;
				fd->version = je32_to_cpu(spd->version);
				fd->ino = je32_to_cpu(spd->ino);
				fd->nhash = full_name_hash(fd->name, spd->nsize);
				fd->type = spd->type;
				USED_SPACE(PAD(je32_to_cpu(spd->totlen)));
				jffs2_add_fd_to_list(c, fd, &ic->scan_dents);

				*pseudo_random += je32_to_cpu(spd->version);

				sp += JFFS2_SUMMARY_DIRENT_SIZE(spd->nsize);

				break;
			}

			default : {
				JFFS2_WARNING("Unsupported node type found in summary! Exiting...");
				kfree(summary);
				return -EIO;
			}
		}
	}

	kfree(summary);
	return 0;
}

/* Process the summary node - called from jffs2_scan_eraseblock() */

int jffs2_sum_scan_sumnode(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
				uint32_t ofs, uint32_t *pseudo_random)
{
	struct jffs2_unknown_node crcnode;
	struct jffs2_raw_node_ref *cache_ref;
	struct jffs2_raw_summary *summary;
	int ret, sumsize;
	uint32_t crc;

	sumsize = c->sector_size - ofs;
	ofs += jeb->offset;

	dbg_summary("summary found for 0x%08x at 0x%08x (0x%x bytes)\n",
				jeb->offset, ofs, sumsize);

	summary = kmalloc(sumsize, GFP_KERNEL);

	if (!summary) {
		return -ENOMEM;
	}

	ret = jffs2_fill_scan_buf(c, (unsigned char *)summary, ofs, sumsize);

	if (ret) {
		kfree(summary);
		return ret;
	}

	/* OK, now check for node validity and CRC */
	crcnode.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
	crcnode.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY);
	crcnode.totlen = summary->totlen;
	crc = crc32(0, &crcnode, sizeof(crcnode)-4);

	if (je32_to_cpu(summary->hdr_crc) != crc) {
		dbg_summary("Summary node header is corrupt (bad CRC or "
				"no summary at all)\n");
		goto crc_err;
	}

	if (je32_to_cpu(summary->totlen) != sumsize) {
		dbg_summary("Summary node is corrupt (wrong erasesize?)\n");
		goto crc_err;
	}

	crc = crc32(0, summary, sizeof(struct jffs2_raw_summary)-8);

	if (je32_to_cpu(summary->node_crc) != crc) {
		dbg_summary("Summary node is corrupt (bad CRC)\n");
		goto crc_err;
	}

	crc = crc32(0, summary->sum, sumsize - sizeof(struct jffs2_raw_summary));

	if (je32_to_cpu(summary->sum_crc) != crc) {
		dbg_summary("Summary node data is corrupt (bad CRC)\n");
		goto crc_err;
	}

	if ( je32_to_cpu(summary->cln_mkr) ) {

		dbg_summary("Summary : CLEANMARKER node \n");

		if (je32_to_cpu(summary->cln_mkr) != c->cleanmarker_size) {
			dbg_summary("CLEANMARKER node has totlen 0x%x != normal 0x%x\n",
				je32_to_cpu(summary->cln_mkr), c->cleanmarker_size);
			UNCHECKED_SPACE(PAD(je32_to_cpu(summary->cln_mkr)));
		} else if (jeb->first_node) {
			dbg_summary("CLEANMARKER node not first node in block "
					"(0x%08x)\n", jeb->offset);
			UNCHECKED_SPACE(PAD(je32_to_cpu(summary->cln_mkr)));
		} else {
			struct jffs2_raw_node_ref *marker_ref = jffs2_alloc_raw_node_ref();

			if (!marker_ref) {
				JFFS2_NOTICE("Failed to allocate node ref for clean marker\n");
				kfree(summary);
				return -ENOMEM;
			}

			marker_ref->next_in_ino = NULL;
			marker_ref->next_phys = NULL;
			marker_ref->flash_offset = jeb->offset | REF_NORMAL;
			marker_ref->__totlen = je32_to_cpu(summary->cln_mkr);
			jeb->first_node = jeb->last_node = marker_ref;

			USED_SPACE( PAD(je32_to_cpu(summary->cln_mkr)) );
		}
	}

	if (je32_to_cpu(summary->padded)) {
		DIRTY_SPACE(je32_to_cpu(summary->padded));
	}

	ret = jffs2_sum_process_sum_data(c, jeb, summary, pseudo_random);
	if (ret)
		return ret;

	/* for PARANOIA_CHECK */
	cache_ref = jffs2_alloc_raw_node_ref();

	if (!cache_ref) {
		JFFS2_NOTICE("Failed to allocate node ref for cache\n");
		return -ENOMEM;
	}

	cache_ref->next_in_ino = NULL;
	cache_ref->next_phys = NULL;
	cache_ref->flash_offset = ofs | REF_NORMAL;
	cache_ref->__totlen = sumsize;

	if (!jeb->first_node)
		jeb->first_node = cache_ref;
	if (jeb->last_node)
		jeb->last_node->next_phys = cache_ref;
	jeb->last_node = cache_ref;

	USED_SPACE(sumsize);

	jeb->wasted_size += jeb->free_size;
	c->wasted_size += jeb->free_size;
	c->free_size -= jeb->free_size;
	jeb->free_size = 0;

	return jffs2_scan_classify_jeb(c, jeb);

crc_err:
	JFFS2_WARNING("Summary node crc error, skipping summary information.\n");

	return 0;
}

/* Write summary data to flash - helper function for jffs2_sum_write_sumnode() */

static int jffs2_sum_write_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
					uint32_t infosize, uint32_t datasize, int padsize)
{
	struct jffs2_raw_summary isum;
	union jffs2_sum_mem *temp;
	struct jffs2_sum_marker *sm;
	struct kvec vecs[2];
	void *wpage;
	int ret;
	size_t retlen;

	memset(c->summary->sum_buf, 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(c->summary->sum_padded);
	isum.cln_mkr = cpu_to_je32(c->cleanmarker_size);
	isum.sum_num = cpu_to_je32(c->summary->sum_num);
	wpage = c->summary->sum_buf;

	while (c->summary->sum_num) {
		temp = c->summary->sum_list_head;

		switch (je16_to_cpu(temp->u.nodetype)) {
			case JFFS2_NODETYPE_INODE: {
				struct jffs2_sum_inode_flash *sino_ptr = wpage;

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

				wpage += JFFS2_SUMMARY_INODE_SIZE;

				break;
			}

			case JFFS2_NODETYPE_DIRENT: {
				struct jffs2_sum_dirent_flash *sdrnt_ptr = wpage;

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

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

				wpage += JFFS2_SUMMARY_DIRENT_SIZE(temp->d.nsize);

				break;
			}

			default : {
				BUG();	/* unknown node in summary information */
			}
		}

		c->summary->sum_list_head = temp->u.next;
		kfree(temp);

		c->summary->sum_num--;
	}

	jffs2_sum_reset_collected(c->summary);

	wpage += padsize;

	sm = wpage;
	sm->offset = cpu_to_je32(c->sector_size - jeb->free_size);
	sm->magic = cpu_to_je32(JFFS2_SUM_MAGIC);

	isum.sum_crc = cpu_to_je32(crc32(0, c->summary->sum_buf, datasize));
	isum.node_crc = cpu_to_je32(crc32(0, &isum, sizeof(isum) - 8));

	vecs[0].iov_base = &isum;
	vecs[0].iov_len = sizeof(isum);
	vecs[1].iov_base = c->summary->sum_buf;
	vecs[1].iov_len = datasize;

	dbg_summary("JFFS2: writing out data to flash to pos : 0x%08x\n",
			jeb->offset + c->sector_size - jeb->free_size);

	spin_unlock(&c->erase_completion_lock);
	ret = jffs2_flash_writev(c, vecs, 2, jeb->offset + c->sector_size -
				jeb->free_size, &retlen, 0);
	spin_lock(&c->erase_completion_lock);


	if (ret || (retlen != infosize)) {
		JFFS2_WARNING("Write of %d bytes at 0x%08x failed. returned %d, retlen %zu\n",
			infosize, jeb->offset + c->sector_size - jeb->free_size, ret, retlen);

		c->summary->sum_size = JFFS2_SUMMARY_NOSUM_SIZE;
		WASTED_SPACE(infosize);

		return 1;
	}

	return 0;
}

/* Write out summary information - called from jffs2_do_reserve_space */

int jffs2_sum_write_sumnode(struct jffs2_sb_info *c)
{
	struct jffs2_raw_node_ref *summary_ref;
	int datasize, infosize, padsize, ret;
	struct jffs2_eraseblock *jeb;

	dbg_summary("called\n");

	jeb = c->nextblock;

	if (!c->summary->sum_num || !c->summary->sum_list_head) {
		JFFS2_WARNING("Empty summary info!!!\n");
		BUG();
	}

	datasize = c->summary->sum_size + sizeof(struct jffs2_sum_marker);
	infosize = sizeof(struct jffs2_raw_summary) + datasize;
	padsize = jeb->free_size - infosize;
	infosize += padsize;
	datasize += padsize;

	/* Is there enough space for summary? */
	if (padsize < 0) {
		/* don't try to write out summary for this jeb */
		jffs2_sum_disable_collecting(c->summary);

		JFFS2_WARNING("Not enough space for summary, padsize = %d\n", padsize);
		return 0;
	}

	ret = jffs2_sum_write_data(c, jeb, infosize, datasize, padsize);
	if (ret)
		return 0; /* can't write out summary, block is marked as NOSUM_SIZE */

	/* for ACCT_PARANOIA_CHECK */
	spin_unlock(&c->erase_completion_lock);
	summary_ref = jffs2_alloc_raw_node_ref();
	spin_lock(&c->erase_completion_lock);

	if (!summary_ref) {
		JFFS2_NOTICE("Failed to allocate node ref for summary\n");
		return -ENOMEM;
	}

	summary_ref->next_in_ino = NULL;
	summary_ref->next_phys = NULL;
	summary_ref->flash_offset = (jeb->offset + c->sector_size - jeb->free_size) | REF_NORMAL;
	summary_ref->__totlen = infosize;

	if (!jeb->first_node)
		jeb->first_node = summary_ref;
	if (jeb->last_node)
		jeb->last_node->next_phys = summary_ref;
	jeb->last_node = summary_ref;

	USED_SPACE(infosize);

	return 0;
}
Commit	Line	Data
e631ddba FH	1	/*
	2	* JFFS2 -- Journalling Flash File System, Version 2.
	3	*
	4	* Copyright (C) 2004 Ferenc Havasi <havasi@inf.u-szeged.hu>,
	5	* Zoltan Sogor <weth@inf.u-szeged.hu>,
	6	* Patrik Kluba <pajko@halom.u-szeged.hu>,
	7	* University of Szeged, Hungary
	8	*
	9	* For licensing information, see the file 'LICENCE' in this directory.
	10	*
2bc9764c	11	* $Id: summary.c,v 1.4 2005/09/26 11:37:21 havasi Exp $
e631ddba FH	12	*
	13	*/
	14
	15	#include <linux/kernel.h>
	16	#include <linux/sched.h>
	17	#include <linux/slab.h>
	18	#include <linux/mtd/mtd.h>
	19	#include <linux/pagemap.h>
	20	#include <linux/crc32.h>
	21	#include <linux/compiler.h>
	22	#include <linux/vmalloc.h>
	23	#include "nodelist.h"
	24	#include "debug.h"
	25
	26	int jffs2_sum_init(struct jffs2_sb_info *c)
	27	{
	28	c->summary = kmalloc(sizeof(struct jffs2_summary), GFP_KERNEL);
	29
	30	if (!c->summary) {
	31	JFFS2_WARNING("Can't allocate memory for summary information!\n");
	32	return -ENOMEM;
	33	}
	34
	35	memset(c->summary, 0, sizeof(struct jffs2_summary));
	36
	37	c->summary->sum_buf = vmalloc(c->sector_size);
	38
	39	if (!c->summary->sum_buf) {
	40	JFFS2_WARNING("Can't allocate buffer for writing out summary information!\n");
733802d9	41	kfree(c->summary);
e631ddba FH	42	return -ENOMEM;
	43	}
	44
733802d9	45	dbg_summary("returned succesfully\n");
e631ddba FH	46
	47	return 0;
	48	}
	49
	50	void jffs2_sum_exit(struct jffs2_sb_info *c)
	51	{
733802d9	52	dbg_summary("called\n");
e631ddba FH	53
	54	jffs2_sum_disable_collecting(c->summary);
	55
	56	vfree(c->summary->sum_buf);
	57	c->summary->sum_buf = NULL;
	58
	59	kfree(c->summary);
	60	c->summary = NULL;
	61	}
	62
	63	static int jffs2_sum_add_mem(struct jffs2_summary s, union jffs2_sum_mem item)
	64	{
	65	if (!s->sum_list_head)
	66	s->sum_list_head = (union jffs2_sum_mem *) item;
	67	if (s->sum_list_tail)
	68	s->sum_list_tail->u.next = (union jffs2_sum_mem *) item;
	69	s->sum_list_tail = (union jffs2_sum_mem *) item;
	70
	71	switch (je16_to_cpu(item->u.nodetype)) {
	72	case JFFS2_NODETYPE_INODE:
	73	s->sum_size += JFFS2_SUMMARY_INODE_SIZE;
	74	s->sum_num++;
733802d9	75	dbg_summary("inode (%u) added to summary\n",
e631ddba FH	76	je32_to_cpu(item->i.inode));
	77	break;
	78	case JFFS2_NODETYPE_DIRENT:
	79	s->sum_size += JFFS2_SUMMARY_DIRENT_SIZE(item->d.nsize);
	80	s->sum_num++;
733802d9	81	dbg_summary("dirent (%u) added to summary\n",
e631ddba FH	82	je32_to_cpu(item->d.ino));
	83	break;
	84	default:
182ec4ee	85	JFFS2_WARNING("UNKNOWN node type %u\n",
e631ddba FH	86	je16_to_cpu(item->u.nodetype));
	87	return 1;
	88	}
	89	return 0;
	90	}
	91
	92
	93	/* The following 3 functions are called from scan.c to collect summary info for not closed jeb */
	94
	95	int jffs2_sum_add_padding_mem(struct jffs2_summary *s, uint32_t size)
	96	{
733802d9	97	dbg_summary("called with %u\n", size);
e631ddba FH	98	s->sum_padded += size;
	99	return 0;
	100	}
	101
	102	int jffs2_sum_add_inode_mem(struct jffs2_summary s, struct jffs2_raw_inode ri,
	103	uint32_t ofs)
	104	{
	105	struct jffs2_sum_inode_mem *temp = kmalloc(sizeof(struct jffs2_sum_inode_mem), GFP_KERNEL);
	106
	107	if (!temp)
	108	return -ENOMEM;
	109
	110	temp->nodetype = ri->nodetype;
	111	temp->inode = ri->ino;
	112	temp->version = ri->version;
	113	temp->offset = cpu_to_je32(ofs); /* relative offset from the begining of the jeb */
	114	temp->totlen = ri->totlen;
	115	temp->next = NULL;
	116
	117	return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
	118	}
	119
	120	int jffs2_sum_add_dirent_mem(struct jffs2_summary s, struct jffs2_raw_dirent rd,
	121	uint32_t ofs)
	122	{
	123	struct jffs2_sum_dirent_mem *temp =
	124	kmalloc(sizeof(struct jffs2_sum_dirent_mem) + rd->nsize, GFP_KERNEL);
	125
	126	if (!temp)
	127	return -ENOMEM;
	128
	129	temp->nodetype = rd->nodetype;
	130	temp->totlen = rd->totlen;
	131	temp->offset = cpu_to_je32(ofs); /* relative from the begining of the jeb */
	132	temp->pino = rd->pino;
	133	temp->version = rd->version;
	134	temp->ino = rd->ino;
	135	temp->nsize = rd->nsize;
	136	temp->type = rd->type;
	137	temp->next = NULL;
	138
	139	memcpy(temp->name, rd->name, rd->nsize);
	140
	141	return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
	142	}
	143
	144	/* Cleanup every collected summary information */
	145
	146	static void jffs2_sum_clean_collected(struct jffs2_summary *s)
	147	{
	148	union jffs2_sum_mem *temp;
	149
	150	if (!s->sum_list_head) {
733802d9	151	dbg_summary("already empty\n");
e631ddba FH	152	}
	153	while (s->sum_list_head) {
	154	temp = s->sum_list_head;
	155	s->sum_list_head = s->sum_list_head->u.next;
	156	kfree(temp);
	157	}
	158	s->sum_list_tail = NULL;
	159	s->sum_padded = 0;
	160	s->sum_num = 0;
	161	}
	162
	163	void jffs2_sum_reset_collected(struct jffs2_summary *s)
	164	{
733802d9	165	dbg_summary("called\n");
e631ddba FH	166	jffs2_sum_clean_collected(s);
	167	s->sum_size = 0;
	168	}
	169
	170	void jffs2_sum_disable_collecting(struct jffs2_summary *s)
	171	{
733802d9	172	dbg_summary("called\n");
e631ddba FH	173	jffs2_sum_clean_collected(s);
	174	s->sum_size = JFFS2_SUMMARY_NOSUM_SIZE;
	175	}
	176
182ec4ee	177	int jffs2_sum_is_disabled(struct jffs2_summary *s)
e631ddba FH	178	{
	179	return (s->sum_size == JFFS2_SUMMARY_NOSUM_SIZE);
	180	}
	181
	182	/* Move the collected summary information into sb (called from scan.c) */
	183
	184	void jffs2_sum_move_collected(struct jffs2_sb_info c, struct jffs2_summary s)
	185	{
733802d9	186	dbg_summary("oldsize=0x%x oldnum=%u => newsize=0x%x newnum=%u\n",
e631ddba FH	187	c->summary->sum_size, c->summary->sum_num,
	188	s->sum_size, s->sum_num);
	189
	190	c->summary->sum_size = s->sum_size;
	191	c->summary->sum_num = s->sum_num;
	192	c->summary->sum_padded = s->sum_padded;
	193	c->summary->sum_list_head = s->sum_list_head;
	194	c->summary->sum_list_tail = s->sum_list_tail;
	195
	196	s->sum_list_head = s->sum_list_tail = NULL;
	197	}
	198
	199	/* Called from wbuf.c to collect writed node info */
	200
	201	int jffs2_sum_add_kvec(struct jffs2_sb_info c, const struct kvec invecs,
	202	unsigned long count, uint32_t ofs)
	203	{
	204	union jffs2_node_union *node;
	205	struct jffs2_eraseblock *jeb;
	206
	207	node = invecs[0].iov_base;
	208	jeb = &c->blocks[ofs / c->sector_size];
	209	ofs -= jeb->offset;
	210
	211	switch (je16_to_cpu(node->u.nodetype)) {
	212	case JFFS2_NODETYPE_INODE: {
	213	struct jffs2_sum_inode_mem *temp =
	214	kmalloc(sizeof(struct jffs2_sum_inode_mem), GFP_KERNEL);
	215
	216	if (!temp)
	217	goto no_mem;
	218
	219	temp->nodetype = node->i.nodetype;
	220	temp->inode = node->i.ino;
	221	temp->version = node->i.version;
	222	temp->offset = cpu_to_je32(ofs);
	223	temp->totlen = node->i.totlen;
	224	temp->next = NULL;
	225
	226	return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
	227	}
	228
	229	case JFFS2_NODETYPE_DIRENT: {
	230	struct jffs2_sum_dirent_mem *temp =
	231	kmalloc(sizeof(struct jffs2_sum_dirent_mem) + node->d.nsize, GFP_KERNEL);
	232
	233	if (!temp)
	234	goto no_mem;
	235
	236	temp->nodetype = node->d.nodetype;
	237	temp->totlen = node->d.totlen;
	238	temp->offset = cpu_to_je32(ofs);
	239	temp->pino = node->d.pino;
	240	temp->version = node->d.version;
	241	temp->ino = node->d.ino;
	242	temp->nsize = node->d.nsize;
	243	temp->type = node->d.type;
	244	temp->next = NULL;
	245
	246	switch (count) {
	247	case 1:
	248	memcpy(temp->name,node->d.name,node->d.nsize);
	249	break;
	250
251	case 2:
252	memcpy(temp->name,invecs[1].iov_base,node->d.nsize);
253	break;
254
255	default:
256	BUG(); /* impossible count value */
257	break;
258	}
259
260	return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
261	}
262
263	case JFFS2_NODETYPE_PADDING:
733802d9	264	dbg_summary("node PADDING\n");
e631ddba FH	265	c->summary->sum_padded += je32_to_cpu(node->u.totlen);
	266	break;
	267
	268	case JFFS2_NODETYPE_CLEANMARKER:
733802d9	269	dbg_summary("node CLEANMARKER\n");
e631ddba FH	270	break;
	271
	272	case JFFS2_NODETYPE_SUMMARY:
733802d9	273	dbg_summary("node SUMMARY\n");
e631ddba FH	274	break;
	275
	276	default:
	277	/* If you implement a new node type you should also implement
	278	summary support for it or disable summary.
	279	*/
	280	BUG();
	281	break;
	282	}
	283
	284	return 0;
	285
	286	no_mem:
	287	JFFS2_WARNING("MEMORY ALLOCATION ERROR!");
	288	return -ENOMEM;
	289	}
	290
	291
	292	/* Process the stored summary information - helper function for jffs2_sum_scan_sumnode() */
	293
	294	static int jffs2_sum_process_sum_data(struct jffs2_sb_info c, struct jffs2_eraseblock jeb,
2bc9764c	295	struct jffs2_raw_summary summary, uint32_t pseudo_random)
e631ddba FH	296	{
	297	struct jffs2_raw_node_ref *raw;
	298	struct jffs2_inode_cache *ic;
	299	struct jffs2_full_dirent *fd;
	300	void *sp;
	301	int i, ino;
	302
	303	sp = summary->sum;
	304
	305	for (i=0; i<je32_to_cpu(summary->sum_num); i++) {
733802d9	306	dbg_summary("processing summary index %d\n", i);
e631ddba FH	307
	308	switch (je16_to_cpu(((struct jffs2_sum_unknown_flash *)sp)->nodetype)) {
	309	case JFFS2_NODETYPE_INODE: {
	310	struct jffs2_sum_inode_flash *spi;
	311	spi = sp;
	312
	313	ino = je32_to_cpu(spi->inode);
	314
733802d9	315	dbg_summary("Inode at 0x%08x\n",
e631ddba FH	316	jeb->offset + je32_to_cpu(spi->offset));
	317
	318	raw = jffs2_alloc_raw_node_ref();
	319	if (!raw) {
	320	JFFS2_NOTICE("allocation of node reference failed\n");
	321	kfree(summary);
	322	return -ENOMEM;
	323	}
	324
	325	ic = jffs2_scan_make_ino_cache(c, ino);
	326	if (!ic) {
	327	JFFS2_NOTICE("scan_make_ino_cache failed\n");
	328	jffs2_free_raw_node_ref(raw);
	329	kfree(summary);
	330	return -ENOMEM;
	331	}
	332
	333	raw->flash_offset = (jeb->offset + je32_to_cpu(spi->offset)) \| REF_UNCHECKED;
	334	raw->__totlen = PAD(je32_to_cpu(spi->totlen));
	335	raw->next_phys = NULL;
	336	raw->next_in_ino = ic->nodes;
	337
	338	ic->nodes = raw;
	339	if (!jeb->first_node)
	340	jeb->first_node = raw;
	341	if (jeb->last_node)
	342	jeb->last_node->next_phys = raw;
	343	jeb->last_node = raw;
	344	*pseudo_random += je32_to_cpu(spi->version);
	345
	346	UNCHECKED_SPACE(PAD(je32_to_cpu(spi->totlen)));
	347
	348	sp += JFFS2_SUMMARY_INODE_SIZE;
	349
	350	break;
	351	}
	352
	353	case JFFS2_NODETYPE_DIRENT: {
	354	struct jffs2_sum_dirent_flash *spd;
	355	spd = sp;
	356
733802d9	357	dbg_summary("Dirent at 0x%08x\n",
e631ddba FH	358	jeb->offset + je32_to_cpu(spd->offset));
	359
	360	fd = jffs2_alloc_full_dirent(spd->nsize+1);
	361	if (!fd) {
	362	kfree(summary);
	363	return -ENOMEM;
	364	}
	365
	366	memcpy(&fd->name, spd->name, spd->nsize);
	367	fd->name[spd->nsize] = 0;
	368
	369	raw = jffs2_alloc_raw_node_ref();
	370	if (!raw) {
	371	jffs2_free_full_dirent(fd);
	372	JFFS2_NOTICE("allocation of node reference failed\n");
	373	kfree(summary);
	374	return -ENOMEM;
	375	}
	376
	377	ic = jffs2_scan_make_ino_cache(c, je32_to_cpu(spd->pino));
	378	if (!ic) {
	379	jffs2_free_full_dirent(fd);
	380	jffs2_free_raw_node_ref(raw);
	381	kfree(summary);
	382	return -ENOMEM;
	383	}
	384
	385	raw->__totlen = PAD(je32_to_cpu(spd->totlen));
	386	raw->flash_offset = (jeb->offset + je32_to_cpu(spd->offset)) \| REF_PRISTINE;
	387	raw->next_phys = NULL;
	388	raw->next_in_ino = ic->nodes;
	389	ic->nodes = raw;
	390	if (!jeb->first_node)
	391	jeb->first_node = raw;
	392	if (jeb->last_node)
	393	jeb->last_node->next_phys = raw;
	394	jeb->last_node = raw;
	395
	396	fd->raw = raw;
	397	fd->next = NULL;
	398	fd->version = je32_to_cpu(spd->version);
	399	fd->ino = je32_to_cpu(spd->ino);
	400	fd->nhash = full_name_hash(fd->name, spd->nsize);
	401	fd->type = spd->type;
	402	USED_SPACE(PAD(je32_to_cpu(spd->totlen)));
	403	jffs2_add_fd_to_list(c, fd, &ic->scan_dents);
	404
	405	*pseudo_random += je32_to_cpu(spd->version);
	406
	407	sp += JFFS2_SUMMARY_DIRENT_SIZE(spd->nsize);
	408
	409	break;
	410	}
	411
	412	default : {
	413	JFFS2_WARNING("Unsupported node type found in summary! Exiting...");
	414	kfree(summary);
	415	return -EIO;
	416	}
	417	}
	418	}
	419
	420	kfree(summary);
	421	return 0;
422	}
423
424	/* Process the summary node - called from jffs2_scan_eraseblock() */
425
426	int jffs2_sum_scan_sumnode(struct jffs2_sb_info c, struct jffs2_eraseblock jeb,
427	uint32_t ofs, uint32_t *pseudo_random)
428	{
429	struct jffs2_unknown_node crcnode;
430	struct jffs2_raw_node_ref *cache_ref;
2bc9764c	431	struct jffs2_raw_summary *summary;
e631ddba FH	432	int ret, sumsize;
	433	uint32_t crc;
	434
	435	sumsize = c->sector_size - ofs;
	436	ofs += jeb->offset;
	437
733802d9	438	dbg_summary("summary found for 0x%08x at 0x%08x (0x%x bytes)\n",
e631ddba FH	439	jeb->offset, ofs, sumsize);
	440
	441	summary = kmalloc(sumsize, GFP_KERNEL);
	442
	443	if (!summary) {
	444	return -ENOMEM;
	445	}
	446
	447	ret = jffs2_fill_scan_buf(c, (unsigned char *)summary, ofs, sumsize);
	448
	449	if (ret) {
	450	kfree(summary);
	451	return ret;
	452	}
	453
	454	/* OK, now check for node validity and CRC */
	455	crcnode.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
	456	crcnode.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY);
	457	crcnode.totlen = summary->totlen;
	458	crc = crc32(0, &crcnode, sizeof(crcnode)-4);
	459
	460	if (je32_to_cpu(summary->hdr_crc) != crc) {
733802d9	461	dbg_summary("Summary node header is corrupt (bad CRC or "
e631ddba FH	462	"no summary at all)\n");
	463	goto crc_err;
	464	}
	465
	466	if (je32_to_cpu(summary->totlen) != sumsize) {
733802d9	467	dbg_summary("Summary node is corrupt (wrong erasesize?)\n");
e631ddba FH	468	goto crc_err;
	469	}
	470
2bc9764c	471	crc = crc32(0, summary, sizeof(struct jffs2_raw_summary)-8);
e631ddba FH	472
e631ddba FH	473	if (je32_to_cpu(summary->node_crc) != crc) {
733802d9	474	dbg_summary("Summary node is corrupt (bad CRC)\n");
e631ddba FH	475	goto crc_err;
	476	}
	477
2bc9764c	478	crc = crc32(0, summary->sum, sumsize - sizeof(struct jffs2_raw_summary));
e631ddba FH	479
e631ddba FH	480	if (je32_to_cpu(summary->sum_crc) != crc) {
733802d9	481	dbg_summary("Summary node data is corrupt (bad CRC)\n");
e631ddba FH	482	goto crc_err;
	483	}
	484
	485	if ( je32_to_cpu(summary->cln_mkr) ) {
	486
733802d9	487	dbg_summary("Summary : CLEANMARKER node \n");
e631ddba FH	488
e631ddba FH	489	if (je32_to_cpu(summary->cln_mkr) != c->cleanmarker_size) {
733802d9	490	dbg_summary("CLEANMARKER node has totlen 0x%x != normal 0x%x\n",
e631ddba FH	491	je32_to_cpu(summary->cln_mkr), c->cleanmarker_size);
	492	UNCHECKED_SPACE(PAD(je32_to_cpu(summary->cln_mkr)));
	493	} else if (jeb->first_node) {
733802d9	494	dbg_summary("CLEANMARKER node not first node in block "
e631ddba FH	495	"(0x%08x)\n", jeb->offset);
	496	UNCHECKED_SPACE(PAD(je32_to_cpu(summary->cln_mkr)));
	497	} else {
	498	struct jffs2_raw_node_ref *marker_ref = jffs2_alloc_raw_node_ref();
	499
	500	if (!marker_ref) {
	501	JFFS2_NOTICE("Failed to allocate node ref for clean marker\n");
	502	kfree(summary);
	503	return -ENOMEM;
	504	}
	505
	506	marker_ref->next_in_ino = NULL;
	507	marker_ref->next_phys = NULL;
	508	marker_ref->flash_offset = jeb->offset \| REF_NORMAL;
	509	marker_ref->__totlen = je32_to_cpu(summary->cln_mkr);
	510	jeb->first_node = jeb->last_node = marker_ref;
	511
	512	USED_SPACE( PAD(je32_to_cpu(summary->cln_mkr)) );
	513	}
	514	}
	515
	516	if (je32_to_cpu(summary->padded)) {
	517	DIRTY_SPACE(je32_to_cpu(summary->padded));
	518	}
	519
	520	ret = jffs2_sum_process_sum_data(c, jeb, summary, pseudo_random);
	521	if (ret)
	522	return ret;
	523
	524	/* for PARANOIA_CHECK */
	525	cache_ref = jffs2_alloc_raw_node_ref();
	526
	527	if (!cache_ref) {
	528	JFFS2_NOTICE("Failed to allocate node ref for cache\n");
	529	return -ENOMEM;
	530	}
	531
	532	cache_ref->next_in_ino = NULL;
	533	cache_ref->next_phys = NULL;
	534	cache_ref->flash_offset = ofs \| REF_NORMAL;
	535	cache_ref->__totlen = sumsize;
	536
	537	if (!jeb->first_node)
	538	jeb->first_node = cache_ref;
	539	if (jeb->last_node)
	540	jeb->last_node->next_phys = cache_ref;
	541	jeb->last_node = cache_ref;
	542
	543	USED_SPACE(sumsize);
	544
	545	jeb->wasted_size += jeb->free_size;
	546	c->wasted_size += jeb->free_size;
	547	c->free_size -= jeb->free_size;
	548	jeb->free_size = 0;
	549
	550	return jffs2_scan_classify_jeb(c, jeb);
	551
	552	crc_err:
	553	JFFS2_WARNING("Summary node crc error, skipping summary information.\n");
	554
	555	return 0;
	556	}
	557
	558	/* Write summary data to flash - helper function for jffs2_sum_write_sumnode() */
559
560	static int jffs2_sum_write_data(struct jffs2_sb_info c, struct jffs2_eraseblock jeb,
561	uint32_t infosize, uint32_t datasize, int padsize)
562	{
2bc9764c	563	struct jffs2_raw_summary isum;
e631ddba FH	564	union jffs2_sum_mem *temp;
	565	struct jffs2_sum_marker *sm;
	566	struct kvec vecs[2];
	567	void *wpage;
	568	int ret;
	569	size_t retlen;
	570
	571	memset(c->summary->sum_buf, 0xff, datasize);
	572	memset(&isum, 0, sizeof(isum));
	573
	574	isum.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
	575	isum.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY);
	576	isum.totlen = cpu_to_je32(infosize);
	577	isum.hdr_crc = cpu_to_je32(crc32(0, &isum, sizeof(struct jffs2_unknown_node) - 4));
	578	isum.padded = cpu_to_je32(c->summary->sum_padded);
	579	isum.cln_mkr = cpu_to_je32(c->cleanmarker_size);
	580	isum.sum_num = cpu_to_je32(c->summary->sum_num);
	581	wpage = c->summary->sum_buf;
	582
	583	while (c->summary->sum_num) {
20ffdcb0	584	temp = c->summary->sum_list_head;
e631ddba	585
20ffdcb0	586	switch (je16_to_cpu(temp->u.nodetype)) {
e631ddba FH	587	case JFFS2_NODETYPE_INODE: {
	588	struct jffs2_sum_inode_flash *sino_ptr = wpage;
	589
20ffdcb0 JJ	590	sino_ptr->nodetype = temp->i.nodetype;
	591	sino_ptr->inode = temp->i.inode;
	592	sino_ptr->version = temp->i.version;
	593	sino_ptr->offset = temp->i.offset;
	594	sino_ptr->totlen = temp->i.totlen;
e631ddba FH	595
	596	wpage += JFFS2_SUMMARY_INODE_SIZE;
	597
	598	break;
	599	}
	600
	601	case JFFS2_NODETYPE_DIRENT: {
	602	struct jffs2_sum_dirent_flash *sdrnt_ptr = wpage;
	603
20ffdcb0 JJ	604	sdrnt_ptr->nodetype = temp->d.nodetype;
	605	sdrnt_ptr->totlen = temp->d.totlen;
	606	sdrnt_ptr->offset = temp->d.offset;
	607	sdrnt_ptr->pino = temp->d.pino;
	608	sdrnt_ptr->version = temp->d.version;
	609	sdrnt_ptr->ino = temp->d.ino;
	610	sdrnt_ptr->nsize = temp->d.nsize;
	611	sdrnt_ptr->type = temp->d.type;
e631ddba	612
20ffdcb0 JJ	613	memcpy(sdrnt_ptr->name, temp->d.name,
20ffdcb0 JJ	614	temp->d.nsize);
e631ddba	615
20ffdcb0	616	wpage += JFFS2_SUMMARY_DIRENT_SIZE(temp->d.nsize);
e631ddba FH	617
	618	break;
	619	}
	620
	621	default : {
	622	BUG(); /* unknown node in summary information */
	623	}
	624	}
	625
20ffdcb0	626	c->summary->sum_list_head = temp->u.next;
e631ddba FH	627	kfree(temp);
	628
	629	c->summary->sum_num--;
	630	}
	631
	632	jffs2_sum_reset_collected(c->summary);
	633
	634	wpage += padsize;
	635
	636	sm = wpage;
	637	sm->offset = cpu_to_je32(c->sector_size - jeb->free_size);
	638	sm->magic = cpu_to_je32(JFFS2_SUM_MAGIC);
	639
	640	isum.sum_crc = cpu_to_je32(crc32(0, c->summary->sum_buf, datasize));
	641	isum.node_crc = cpu_to_je32(crc32(0, &isum, sizeof(isum) - 8));
	642
	643	vecs[0].iov_base = &isum;
	644	vecs[0].iov_len = sizeof(isum);
	645	vecs[1].iov_base = c->summary->sum_buf;
	646	vecs[1].iov_len = datasize;
	647
733802d9	648	dbg_summary("JFFS2: writing out data to flash to pos : 0x%08x\n",
e631ddba FH	649	jeb->offset + c->sector_size - jeb->free_size);
	650
	651	spin_unlock(&c->erase_completion_lock);
	652	ret = jffs2_flash_writev(c, vecs, 2, jeb->offset + c->sector_size -
	653	jeb->free_size, &retlen, 0);
	654	spin_lock(&c->erase_completion_lock);
	655
	656
	657	if (ret \|\| (retlen != infosize)) {
fb6a82c9	658	JFFS2_WARNING("Write of %d bytes at 0x%08x failed. returned %d, retlen %zu\n",
e631ddba FH	659	infosize, jeb->offset + c->sector_size - jeb->free_size, ret, retlen);
	660
	661	c->summary->sum_size = JFFS2_SUMMARY_NOSUM_SIZE;
	662	WASTED_SPACE(infosize);
	663
	664	return 1;
	665	}
	666
	667	return 0;
	668	}
	669
	670	/* Write out summary information - called from jffs2_do_reserve_space */
	671
	672	int jffs2_sum_write_sumnode(struct jffs2_sb_info *c)
	673	{
	674	struct jffs2_raw_node_ref *summary_ref;
	675	int datasize, infosize, padsize, ret;
	676	struct jffs2_eraseblock *jeb;
	677
733802d9	678	dbg_summary("called\n");
e631ddba FH	679
	680	jeb = c->nextblock;
	681
	682	if (!c->summary->sum_num \|\| !c->summary->sum_list_head) {
	683	JFFS2_WARNING("Empty summary info!!!\n");
	684	BUG();
	685	}
	686
	687	datasize = c->summary->sum_size + sizeof(struct jffs2_sum_marker);
2bc9764c	688	infosize = sizeof(struct jffs2_raw_summary) + datasize;
e631ddba	689	padsize = jeb->free_size - infosize;
182ec4ee	690	infosize += padsize;
e631ddba FH	691	datasize += padsize;
	692
	693	/* Is there enough space for summary? */
	694	if (padsize < 0) {
	695	/* don't try to write out summary for this jeb */
	696	jffs2_sum_disable_collecting(c->summary);
	697
	698	JFFS2_WARNING("Not enough space for summary, padsize = %d\n", padsize);
	699	return 0;
	700	}
	701
	702	ret = jffs2_sum_write_data(c, jeb, infosize, datasize, padsize);
	703	if (ret)
	704	return 0; /* can't write out summary, block is marked as NOSUM_SIZE */
	705
	706	/* for ACCT_PARANOIA_CHECK */
	707	spin_unlock(&c->erase_completion_lock);
	708	summary_ref = jffs2_alloc_raw_node_ref();
	709	spin_lock(&c->erase_completion_lock);
	710
	711	if (!summary_ref) {
	712	JFFS2_NOTICE("Failed to allocate node ref for summary\n");
	713	return -ENOMEM;
	714	}
	715
	716	summary_ref->next_in_ino = NULL;
	717	summary_ref->next_phys = NULL;
	718	summary_ref->flash_offset = (jeb->offset + c->sector_size - jeb->free_size) \| REF_NORMAL;
	719	summary_ref->__totlen = infosize;
	720
	721	if (!jeb->first_node)
	722	jeb->first_node = summary_ref;
	723	if (jeb->last_node)
	724	jeb->last_node->next_phys = summary_ref;
	725	jeb->last_node = summary_ref;
	726
	727	USED_SPACE(infosize);
	728
	729	return 0;
	730	}