Пример #1
0
int jffs2_sum_write_sumnode(struct jffs2_sb_info *c)
{
	int datasize, infosize, padsize;
	struct jffs2_eraseblock *jeb;
	int ret = 0;

	dbg_summary("called\n");

	spin_unlock(&c->erase_completion_lock);

	jeb = c->nextblock;
	jffs2_prealloc_raw_node_refs(c, jeb, 1);

	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;

	ret = jffs2_sum_write_data(c, jeb, infosize, datasize, padsize);
	spin_lock(&c->erase_completion_lock);
	return ret;
}
Пример #2
0
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;
	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;
}
Пример #3
0
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;
}
Пример #4
0
int jffs2_sum_write_sumnode(struct jffs2_sb_info *c)
{
	int datasize, infosize, padsize;
	struct jffs2_eraseblock *jeb;
	int ret;

	dbg_summary("called\n");

	spin_unlock(&c->erase_completion_lock);

	jeb = c->nextblock;
	jffs2_prealloc_raw_node_refs(c, jeb, 1);

	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);
		spin_lock(&c->erase_completion_lock);
		return 0;
	}

	ret = jffs2_sum_write_data(c, jeb, infosize, datasize, padsize);
	spin_lock(&c->erase_completion_lock);
	return ret;
}
Пример #5
0
/* Process the summary node - called from jffs2_scan_eraseblock() */
int jffs2_sum_scan_sumnode(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
			   struct jffs2_raw_summary *summary, uint32_t sumsize,
			   uint32_t *pseudo_random)
{
	struct jffs2_unknown_node crcnode;
	int ret, ofs;
	uint32_t crc;

	ofs = c->sector_size - sumsize;

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

	/* 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");

		ret = jffs2_prealloc_raw_node_refs(c, jeb, 1);
		if (ret)
			return ret;

		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);
			if ((ret = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(summary->cln_mkr)))))
				return ret;
		} else if (jeb->first_node) {
			dbg_summary("CLEANMARKER node not first node in block "
					"(0x%08x)\n", jeb->offset);
			if ((ret = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(summary->cln_mkr)))))
				return ret;
		} else {
			jffs2_link_node_ref(c, jeb, jeb->offset | REF_NORMAL,
					    je32_to_cpu(summary->cln_mkr), NULL);
		}
	}

	ret = jffs2_sum_process_sum_data(c, jeb, summary, pseudo_random);
	/* -ENOTRECOVERABLE isn't a fatal error -- it means we should do a full
	   scan of this eraseblock. So return zero */
	if (ret == -ENOTRECOVERABLE)
		return 0;
	if (ret)
		return ret;		/* real error */

	/* for PARANOIA_CHECK */
	ret = jffs2_prealloc_raw_node_refs(c, jeb, 2);
	if (ret)
		return ret;

	sum_link_node_ref(c, jeb, ofs | REF_NORMAL, sumsize, NULL);

	if (unlikely(jeb->free_size)) {
		JFFS2_WARNING("Free size 0x%x bytes in eraseblock @0x%08x with summary?\n",
			      jeb->free_size, jeb->offset);
		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;
}
Пример #6
0
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_inode_cache *ic;
	struct jffs2_full_dirent *fd;
	void *sp;
	int i, ino;
	int err;

	sp = summary->sum;

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

		cond_resched();

		/* Make sure there's a spare ref for dirty space */
		err = jffs2_prealloc_raw_node_refs(c, jeb, 2);
		if (err)
			return err;

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

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

				sum_link_node_ref(c, jeb, je32_to_cpu(spi->offset) | REF_UNCHECKED,
						  PAD(je32_to_cpu(spi->totlen)), ic);

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

				sp += JFFS2_SUMMARY_INODE_SIZE;

				break;
			}

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

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


				/* This should never happen, but https://dev.laptop.org/ticket/4184 */
				checkedlen = strnlen(spd->name, spd->nsize);
				if (!checkedlen) {
					pr_err("Dirent at %08x has zero at start of name. Aborting mount.\n",
					       jeb->offset +
					       je32_to_cpu(spd->offset));
					return -EIO;
				}
				if (checkedlen < spd->nsize) {
					pr_err("Dirent at %08x has zeroes in name. Truncating to %d chars\n",
					       jeb->offset +
					       je32_to_cpu(spd->offset),
					       checkedlen);
				}


				fd = jffs2_alloc_full_dirent(checkedlen+1);
				if (!fd)
					return -ENOMEM;

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

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

				fd->raw = sum_link_node_ref(c, jeb,  je32_to_cpu(spd->offset) | REF_UNCHECKED,
							    PAD(je32_to_cpu(spd->totlen)), ic);

				fd->next = NULL;
				fd->version = je32_to_cpu(spd->version);
				fd->ino = je32_to_cpu(spd->ino);
				fd->nhash = full_name_hash(NULL, fd->name, checkedlen);
				fd->type = spd->type;

				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;
			}
#ifdef CONFIG_JFFS2_FS_XATTR
			case JFFS2_NODETYPE_XATTR: {
				struct jffs2_xattr_datum *xd;
				struct jffs2_sum_xattr_flash *spx;

				spx = (struct jffs2_sum_xattr_flash *)sp;
				dbg_summary("xattr at %#08x-%#08x (xid=%u, version=%u)\n", 
					    jeb->offset + je32_to_cpu(spx->offset),
					    jeb->offset + je32_to_cpu(spx->offset) + je32_to_cpu(spx->totlen),
					    je32_to_cpu(spx->xid), je32_to_cpu(spx->version));

				xd = jffs2_setup_xattr_datum(c, je32_to_cpu(spx->xid),
								je32_to_cpu(spx->version));
				if (IS_ERR(xd))
					return PTR_ERR(xd);
				if (xd->version > je32_to_cpu(spx->version)) {
					/* node is not the newest one */
					struct jffs2_raw_node_ref *raw
						= sum_link_node_ref(c, jeb, je32_to_cpu(spx->offset) | REF_UNCHECKED,
								    PAD(je32_to_cpu(spx->totlen)), NULL);
					raw->next_in_ino = xd->node->next_in_ino;
					xd->node->next_in_ino = raw;
				} else {
					xd->version = je32_to_cpu(spx->version);
					sum_link_node_ref(c, jeb, je32_to_cpu(spx->offset) | REF_UNCHECKED,
							  PAD(je32_to_cpu(spx->totlen)), (void *)xd);
				}
				*pseudo_random += je32_to_cpu(spx->xid);
				sp += JFFS2_SUMMARY_XATTR_SIZE;

				break;
			}
			case JFFS2_NODETYPE_XREF: {
				struct jffs2_xattr_ref *ref;
				struct jffs2_sum_xref_flash *spr;

				spr = (struct jffs2_sum_xref_flash *)sp;
				dbg_summary("xref at %#08x-%#08x\n",
					    jeb->offset + je32_to_cpu(spr->offset),
					    jeb->offset + je32_to_cpu(spr->offset) + 
					    (uint32_t)PAD(sizeof(struct jffs2_raw_xref)));

				ref = jffs2_alloc_xattr_ref();
				if (!ref) {
					JFFS2_NOTICE("allocation of xattr_datum failed\n");
					return -ENOMEM;
				}
				ref->next = c->xref_temp;
				c->xref_temp = ref;

				sum_link_node_ref(c, jeb, je32_to_cpu(spr->offset) | REF_UNCHECKED,
						  PAD(sizeof(struct jffs2_raw_xref)), (void *)ref);

				*pseudo_random += ref->node->flash_offset;
				sp += JFFS2_SUMMARY_XREF_SIZE;

				break;
			}
#endif
			default : {
				uint16_t nodetype = je16_to_cpu(((struct jffs2_sum_unknown_flash *)sp)->nodetype);
				JFFS2_WARNING("Unsupported node type %x found in summary! Exiting...\n", nodetype);
				if ((nodetype & JFFS2_COMPAT_MASK) == JFFS2_FEATURE_INCOMPAT)
					return -EIO;

				/* For compatible node types, just fall back to the full scan */
				c->wasted_size -= jeb->wasted_size;
				c->free_size += c->sector_size - jeb->free_size;
				c->used_size -= jeb->used_size;
				c->dirty_size -= jeb->dirty_size;
				jeb->wasted_size = jeb->used_size = jeb->dirty_size = 0;
				jeb->free_size = c->sector_size;

				jffs2_free_jeb_node_refs(c, jeb);
				return -ENOTRECOVERABLE;
			}
		}
	}
	return 0;
}
Пример #7
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;

	if (c->mtd->point) {
		ret = c->mtd->point(c->mtd, 0, c->mtd->size, &pointlen,
				    (void **)&flashbuf, NULL);
		if (!ret && pointlen < c->mtd->size) {
			/* Don't muck about if it won't let us point to the whole flash */
			D1(printk(KERN_DEBUG "MTD point returned len too short: 0x%zx\n", pointlen));
			c->mtd->unpoint(c->mtd, 0, pointlen);
			flashbuf = NULL;
		}
		if (ret)
			D1(printk(KERN_DEBUG "MTD point failed %d\n", ret));
	}
#endif
	if (!flashbuf) {
		/* For NAND it's quicker to read a whole eraseblock at a time,
		   apparently */
		if (c->mtd->type == MTD_NANDFLASH)
			buf_size = c->sector_size;
		else
			buf_size = PAGE_SIZE;

		/* Respect kmalloc limitations */
		if (buf_size > 128*1024)
			buf_size = 128*1024;

		D1(printk(KERN_DEBUG "Allocating readbuf of %d bytes\n", buf_size));
		flashbuf = kmalloc(buf_size, GFP_KERNEL);
		if (!flashbuf)
			return -ENOMEM;
	}

	if (jffs2_sum_active()) {
		s = kzalloc(sizeof(struct jffs2_summary), GFP_KERNEL);
		if (!s) {
			JFFS2_WARNING("Can't allocate memory for summary\n");
			ret = -ENOMEM;
			goto out;
		}
	}

	for (i=0; i<c->nr_blocks; i++) {
		struct jffs2_eraseblock *jeb = &c->blocks[i];

		cond_resched();

		/* reset summary info for next eraseblock scan */
		jffs2_sum_reset_collected(s);

		ret = jffs2_scan_eraseblock(c, jeb, buf_size?flashbuf:(flashbuf+jeb->offset),
						buf_size, s);

		if (ret < 0)
			goto out;

		jffs2_dbg_acct_paranoia_check_nolock(c, jeb);

		/* Now decide which list to put it on */
		switch(ret) {
		case BLK_STATE_ALLFF:
			/*
			 * Empty block.   Since we can't be sure it
			 * was entirely erased, we just queue it for erase
			 * again.  It will be marked as such when the erase
			 * is complete.  Meanwhile we still count it as empty
			 * for later checks.
			 */
			empty_blocks++;
			list_add(&jeb->list, &c->erase_pending_list);
			c->nr_erasing_blocks++;
			break;

		case BLK_STATE_CLEANMARKER:
			/* Only a CLEANMARKER node is valid */
			if (!jeb->dirty_size) {
				/* It's actually free */
				list_add(&jeb->list, &c->free_list);
				c->nr_free_blocks++;
			} else {
				/* Dirt */
				D1(printk(KERN_DEBUG "Adding all-dirty block at 0x%08x to erase_pending_list\n", jeb->offset));
				list_add(&jeb->list, &c->erase_pending_list);
				c->nr_erasing_blocks++;
			}
			break;

		case BLK_STATE_CLEAN:
			/* Full (or almost full) of clean data. Clean list */
			list_add(&jeb->list, &c->clean_list);
			break;

		case BLK_STATE_PARTDIRTY:
			/* Some data, but not full. Dirty list. */
			/* We want to remember the block with most free space
			and stick it in the 'nextblock' position to start writing to it. */
			if (jeb->free_size > min_free(c) &&
					(!c->nextblock || c->nextblock->free_size < jeb->free_size)) {
				/* Better candidate for the next writes to go to */
				if (c->nextblock) {
					ret = file_dirty(c, c->nextblock);
					if (ret)
						goto out;
					/* deleting summary information of the old nextblock */
					jffs2_sum_reset_collected(c->summary);
				}
				/* update collected summary information for the current nextblock */
				jffs2_sum_move_collected(c, s);
				D1(printk(KERN_DEBUG "jffs2_scan_medium(): new nextblock = 0x%08x\n", jeb->offset));
				c->nextblock = jeb;
			} else {
				ret = file_dirty(c, jeb);
				if (ret)
					goto out;
			}
			break;

		case BLK_STATE_ALLDIRTY:
			/* Nothing valid - not even a clean marker. Needs erasing. */
			/* For now we just put it on the erasing list. We'll start the erases later */
			D1(printk(KERN_NOTICE "JFFS2: Erase block at 0x%08x is not formatted. It will be erased\n", jeb->offset));
			list_add(&jeb->list, &c->erase_pending_list);
			c->nr_erasing_blocks++;
			break;

		case BLK_STATE_BADBLOCK:
			D1(printk(KERN_NOTICE "JFFS2: Block at 0x%08x is bad\n", jeb->offset));
			list_add(&jeb->list, &c->bad_list);
			c->bad_size += c->sector_size;
			c->free_size -= c->sector_size;
			bad_blocks++;
			break;
		default:
			printk(KERN_WARNING "jffs2_scan_medium(): unknown block state\n");
			BUG();
		}
	}

	/* Nextblock dirty is always seen as wasted, because we cannot recycle it now */
	if (c->nextblock && (c->nextblock->dirty_size)) {
		c->nextblock->wasted_size += c->nextblock->dirty_size;
		c->wasted_size += c->nextblock->dirty_size;
		c->dirty_size -= c->nextblock->dirty_size;
		c->nextblock->dirty_size = 0;
	}
#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
	if (!jffs2_can_mark_obsolete(c) && c->wbuf_pagesize && c->nextblock && (c->nextblock->free_size % c->wbuf_pagesize)) {
		/* If we're going to start writing into a block which already
		   contains data, and the end of the data isn't page-aligned,
		   skip a little and align it. */

		uint32_t skip = c->nextblock->free_size % c->wbuf_pagesize;

		D1(printk(KERN_DEBUG "jffs2_scan_medium(): Skipping %d bytes in nextblock to ensure page alignment\n",
			  skip));
		jffs2_prealloc_raw_node_refs(c, c->nextblock, 1);
		jffs2_scan_dirty_space(c, c->nextblock, skip);
	}
#endif
	if (c->nr_erasing_blocks) {
		if ( !c->used_size && ((c->nr_free_blocks+empty_blocks+bad_blocks)!= c->nr_blocks || bad_blocks == c->nr_blocks) ) {
			printk(KERN_NOTICE "Cowardly refusing to erase blocks on filesystem with no valid JFFS2 nodes\n");
			printk(KERN_NOTICE "empty_blocks %d, bad_blocks %d, c->nr_blocks %d\n",empty_blocks,bad_blocks,c->nr_blocks);
			ret = -EIO;
			goto out;
		}
		spin_lock(&c->erase_completion_lock);
		jffs2_garbage_collect_trigger(c);
		spin_unlock(&c->erase_completion_lock);
	}
	ret = 0;
 out:
	if (buf_size)
		kfree(flashbuf);
#ifndef __ECOS
	else
		c->mtd->unpoint(c->mtd, 0, c->mtd->size);
#endif
	if (s)
		kfree(s);

	return ret;
}
Пример #8
0
/* Called with 'buf_size == 0' if buf is in fact a pointer _directly_ into
   the flash, XIP-style */
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) {
	struct jffs2_unknown_node *node;
	struct jffs2_unknown_node crcnode;
	uint32_t ofs, prevofs, max_ofs;
	uint32_t hdr_crc, buf_ofs, buf_len;
	int err;
	int noise = 0;


#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
	int cleanmarkerfound = 0;
#endif

	ofs = jeb->offset;
	prevofs = jeb->offset - 1;

	D1(printk(KERN_DEBUG "jffs2_scan_eraseblock(): Scanning block at 0x%x\n", ofs));

#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
	if (c->mtd->type == MTD_NANDFLASH) {
		int ret;

		if (c->mtd->block_isbad(c->mtd, jeb->offset))
			return BLK_STATE_BADBLOCK;

		if (jffs2_cleanmarker_oob(c)) {
			ret = jffs2_check_nand_cleanmarker(c, jeb);
			D2(printk(KERN_NOTICE "jffs_check_nand_cleanmarker returned %d\n", ret));

			/* Even if it's not found, we still scan to see
			   if the block is empty. We use this information
			   to decide whether to erase it or not. */
			switch (ret) {
			case 0:		cleanmarkerfound = 1; break;
			case 1: 	break;
			default: 	return ret;
			}
		}
	}
#endif

	if (jffs2_sum_active()) {
		struct jffs2_sum_marker *sm;
		void *sumptr = NULL;
		uint32_t sumlen;
	      
		if (!buf_size) {
			/* XIP case. Just look, point at the summary if it's there */
			sm = (void *)buf + c->sector_size - sizeof(*sm);
			if (je32_to_cpu(sm->magic) == JFFS2_SUM_MAGIC) {
				sumptr = buf + je32_to_cpu(sm->offset);
				sumlen = c->sector_size - je32_to_cpu(sm->offset);
			}
		} else {
			/* If NAND flash, read a whole page of it. Else just the end */
			if (c->wbuf_pagesize)
				buf_len = c->wbuf_pagesize;
			else
				buf_len = sizeof(*sm);

			/* Read as much as we want into the _end_ of the preallocated buffer */
			err = jffs2_fill_scan_buf(c, buf + buf_size - buf_len, 
						  jeb->offset + c->sector_size - buf_len,
						  buf_len);				
			if (err)
				return err;

			sm = (void *)buf + buf_size - sizeof(*sm);
			if (je32_to_cpu(sm->magic) == JFFS2_SUM_MAGIC) {
				sumlen = c->sector_size - je32_to_cpu(sm->offset);
				sumptr = buf + buf_size - sumlen;

				/* Now, make sure the summary itself is available */
				if (sumlen > buf_size) {
					/* Need to kmalloc for this. */
					sumptr = kmalloc(sumlen, GFP_KERNEL);
					if (!sumptr)
						return -ENOMEM;
					memcpy(sumptr + sumlen - buf_len, buf + buf_size - buf_len, buf_len);
				}
				if (buf_len < sumlen) {
					/* Need to read more so that the entire summary node is present */
					err = jffs2_fill_scan_buf(c, sumptr, 
								  jeb->offset + c->sector_size - sumlen,
								  sumlen - buf_len);				
					if (err)
						return err;
				}
			}

		}

		if (sumptr) {
			err = jffs2_sum_scan_sumnode(c, jeb, sumptr, sumlen, &pseudo_random);

			if (buf_size && sumlen > buf_size)
				kfree(sumptr);
			/* If it returns with a real error, bail. 
			   If it returns positive, that's a block classification
			   (i.e. BLK_STATE_xxx) so return that too.
			   If it returns zero, fall through to full scan. */
			if (err)
				return err;
		}
	}

	buf_ofs = jeb->offset;

	if (!buf_size) {
		/* This is the XIP case -- we're reading _directly_ from the flash chip */
		buf_len = c->sector_size;
	} else {
		buf_len = EMPTY_SCAN_SIZE(c->sector_size);
		err = jffs2_fill_scan_buf(c, buf, buf_ofs, buf_len);
		if (err)
			return err;
	}

	/* We temporarily use 'ofs' as a pointer into the buffer/jeb */
	ofs = 0;
	max_ofs = EMPTY_SCAN_SIZE(c->sector_size);
	/* Scan only EMPTY_SCAN_SIZE of 0xFF before declaring it's empty */
	while(ofs < max_ofs && *(uint32_t *)(&buf[ofs]) == 0xFFFFFFFF)
		ofs += 4;

	if (ofs == max_ofs) {
#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
		if (jffs2_cleanmarker_oob(c)) {
			/* scan oob, take care of cleanmarker */
			int ret = jffs2_check_oob_empty(c, jeb, cleanmarkerfound);
			D2(printk(KERN_NOTICE "jffs2_check_oob_empty returned %d\n",ret));
			switch (ret) {
			case 0:		return cleanmarkerfound ? BLK_STATE_CLEANMARKER : BLK_STATE_ALLFF;
			case 1: 	return BLK_STATE_ALLDIRTY;
			default: 	return ret;
			}
		}
#endif
		D1(printk(KERN_DEBUG "Block at 0x%08x is empty (erased)\n", jeb->offset));
		if (c->cleanmarker_size == 0)
			return BLK_STATE_CLEANMARKER;	/* don't bother with re-erase */
		else
			return BLK_STATE_ALLFF;	/* OK to erase if all blocks are like this */
	}
	if (ofs) {
		D1(printk(KERN_DEBUG "Free space at %08x ends at %08x\n", jeb->offset,
			  jeb->offset + ofs));
		if ((err = jffs2_prealloc_raw_node_refs(c, jeb, 1)))
			return err;
		if ((err = jffs2_scan_dirty_space(c, jeb, ofs)))
			return err;
	}

	/* Now ofs is a complete physical flash offset as it always was... */
	ofs += jeb->offset;

	noise = 10;

	dbg_summary("no summary found in jeb 0x%08x. Apply original scan.\n",jeb->offset);

scan_more:
	while(ofs < jeb->offset + c->sector_size) {

		jffs2_dbg_acct_paranoia_check_nolock(c, jeb);

		/* Make sure there are node refs available for use */
		err = jffs2_prealloc_raw_node_refs(c, jeb, 2);
		if (err)
			return err;

		cond_resched();

		if (ofs & 3) {
			printk(KERN_WARNING "Eep. ofs 0x%08x not word-aligned!\n", ofs);
			ofs = PAD(ofs);
			continue;
		}
		if (ofs == prevofs) {
			printk(KERN_WARNING "ofs 0x%08x has already been seen. Skipping\n", ofs);
			if ((err = jffs2_scan_dirty_space(c, jeb, 4)))
				return err;
			ofs += 4;
			continue;
		}
		prevofs = ofs;

		if (jeb->offset + c->sector_size < ofs + sizeof(*node)) {
			D1(printk(KERN_DEBUG "Fewer than %zd bytes left to end of block. (%x+%x<%x+%zx) Not reading\n", sizeof(struct jffs2_unknown_node),
				  jeb->offset, c->sector_size, ofs, sizeof(*node)));
			if ((err = jffs2_scan_dirty_space(c, jeb, (jeb->offset + c->sector_size)-ofs)))
				return err;
			break;
		}

		if (buf_ofs + buf_len < ofs + sizeof(*node)) {
			buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs);
			D1(printk(KERN_DEBUG "Fewer than %zd bytes (node header) left to end of buf. Reading 0x%x at 0x%08x\n",
				  sizeof(struct jffs2_unknown_node), buf_len, ofs));
			err = jffs2_fill_scan_buf(c, buf, ofs, buf_len);
			if (err)
				return err;
			buf_ofs = ofs;
		}

		node = (struct jffs2_unknown_node *)&buf[ofs-buf_ofs];

		if (*(uint32_t *)(&buf[ofs-buf_ofs]) == 0xffffffff) {
			uint32_t inbuf_ofs;
			uint32_t empty_start, scan_end;

			empty_start = ofs;
			ofs += 4;
			scan_end = min_t(uint32_t, EMPTY_SCAN_SIZE(c->sector_size)/8, buf_len);

			D1(printk(KERN_DEBUG "Found empty flash at 0x%08x\n", ofs));
		more_empty:
			inbuf_ofs = ofs - buf_ofs;
			while (inbuf_ofs < scan_end) {
				if (unlikely(*(uint32_t *)(&buf[inbuf_ofs]) != 0xffffffff)) {
					printk(KERN_WARNING "Empty flash at 0x%08x ends at 0x%08x\n",
					       empty_start, ofs);
					if ((err = jffs2_scan_dirty_space(c, jeb, ofs-empty_start)))
						return err;
					goto scan_more;
				}

				inbuf_ofs+=4;
				ofs += 4;
			}
			/* Ran off end. */
			D1(printk(KERN_DEBUG "Empty flash to end of buffer at 0x%08x\n", ofs));

			/* If we're only checking the beginning of a block with a cleanmarker,
			   bail now */
			if (buf_ofs == jeb->offset && jeb->used_size == PAD(c->cleanmarker_size) &&
			    c->cleanmarker_size && !jeb->dirty_size && !ref_next(jeb->first_node)) {
				D1(printk(KERN_DEBUG "%d bytes at start of block seems clean... assuming all clean\n", EMPTY_SCAN_SIZE(c->sector_size)));
				return BLK_STATE_CLEANMARKER;
			}
			if (!buf_size && (scan_end != buf_len)) {/* XIP/point case */
				scan_end = buf_len;
				goto more_empty;
			}
			
			/* See how much more there is to read in this eraseblock... */
			buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs);
			if (!buf_len) {
				/* No more to read. Break out of main loop without marking
				   this range of empty space as dirty (because it's not) */
				D1(printk(KERN_DEBUG "Empty flash at %08x runs to end of block. Treating as free_space\n",
					  empty_start));
				break;
			}
			/* point never reaches here */
			scan_end = buf_len;
			D1(printk(KERN_DEBUG "Reading another 0x%x at 0x%08x\n", buf_len, ofs));
			err = jffs2_fill_scan_buf(c, buf, ofs, buf_len);
			if (err)
				return err;
			buf_ofs = ofs;
			goto more_empty;
		}

		if (ofs == jeb->offset && je16_to_cpu(node->magic) == KSAMTIB_CIGAM_2SFFJ) {
			printk(KERN_WARNING "Magic bitmask is backwards at offset 0x%08x. Wrong endian filesystem?\n", ofs);
			if ((err = jffs2_scan_dirty_space(c, jeb, 4)))
				return err;
			ofs += 4;
			continue;
		}
		if (je16_to_cpu(node->magic) == JFFS2_DIRTY_BITMASK) {
			D1(printk(KERN_DEBUG "Dirty bitmask at 0x%08x\n", ofs));
			if ((err = jffs2_scan_dirty_space(c, jeb, 4)))
				return err;
			ofs += 4;
			continue;
		}
		if (je16_to_cpu(node->magic) == JFFS2_OLD_MAGIC_BITMASK) {
			printk(KERN_WARNING "Old JFFS2 bitmask found at 0x%08x\n", ofs);
			printk(KERN_WARNING "You cannot use older JFFS2 filesystems with newer kernels\n");
			if ((err = jffs2_scan_dirty_space(c, jeb, 4)))
				return err;
			ofs += 4;
			continue;
		}
		if (je16_to_cpu(node->magic) != JFFS2_MAGIC_BITMASK) {
			/* OK. We're out of possibilities. Whinge and move on */
			noisy_printk(&noise, "jffs2_scan_eraseblock(): Magic bitmask 0x%04x not found at 0x%08x: 0x%04x instead\n",
				     JFFS2_MAGIC_BITMASK, ofs,
				     je16_to_cpu(node->magic));
			if ((err = jffs2_scan_dirty_space(c, jeb, 4)))
				return err;
			ofs += 4;
			continue;
		}
		/* We seem to have a node of sorts. Check the CRC */
		crcnode.magic = node->magic;
		crcnode.nodetype = cpu_to_je16( je16_to_cpu(node->nodetype) | JFFS2_NODE_ACCURATE);
		crcnode.totlen = node->totlen;
		hdr_crc = crc32(0, &crcnode, sizeof(crcnode)-4);

		if (hdr_crc != je32_to_cpu(node->hdr_crc)) {
			noisy_printk(&noise, "jffs2_scan_eraseblock(): Node at 0x%08x {0x%04x, 0x%04x, 0x%08x) has invalid CRC 0x%08x (calculated 0x%08x)\n",
				     ofs, je16_to_cpu(node->magic),
				     je16_to_cpu(node->nodetype),
				     je32_to_cpu(node->totlen),
				     je32_to_cpu(node->hdr_crc),
				     hdr_crc);
			if ((err = jffs2_scan_dirty_space(c, jeb, 4)))
				return err;
			ofs += 4;
			continue;
		}

		if (ofs + je32_to_cpu(node->totlen) > jeb->offset + c->sector_size) {
			/* Eep. Node goes over the end of the erase block. */
			printk(KERN_WARNING "Node at 0x%08x with length 0x%08x would run over the end of the erase block\n",
			       ofs, je32_to_cpu(node->totlen));
			printk(KERN_WARNING "Perhaps the file system was created with the wrong erase size?\n");
			if ((err = jffs2_scan_dirty_space(c, jeb, 4)))
				return err;
			ofs += 4;
			continue;
		}

		if (!(je16_to_cpu(node->nodetype) & JFFS2_NODE_ACCURATE)) {
			/* Wheee. This is an obsoleted node */
			D2(printk(KERN_DEBUG "Node at 0x%08x is obsolete. Skipping\n", ofs));
			if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen)))))
				return err;
			ofs += PAD(je32_to_cpu(node->totlen));
			continue;
		}

		switch(je16_to_cpu(node->nodetype)) {
		case JFFS2_NODETYPE_INODE:
			if (buf_ofs + buf_len < ofs + sizeof(struct jffs2_raw_inode)) {
				buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs);
				D1(printk(KERN_DEBUG "Fewer than %zd bytes (inode node) left to end of buf. Reading 0x%x at 0x%08x\n",
					  sizeof(struct jffs2_raw_inode), buf_len, ofs));
				err = jffs2_fill_scan_buf(c, buf, ofs, buf_len);
				if (err)
					return err;
				buf_ofs = ofs;
				node = (void *)buf;
			}
			err = jffs2_scan_inode_node(c, jeb, (void *)node, ofs, s);
			if (err) return err;
			ofs += PAD(je32_to_cpu(node->totlen));
			break;

		case JFFS2_NODETYPE_DIRENT:
			if (buf_ofs + buf_len < ofs + je32_to_cpu(node->totlen)) {
				buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs);
				D1(printk(KERN_DEBUG "Fewer than %d bytes (dirent node) left to end of buf. Reading 0x%x at 0x%08x\n",
					  je32_to_cpu(node->totlen), buf_len, ofs));
				err = jffs2_fill_scan_buf(c, buf, ofs, buf_len);
				if (err)
					return err;
				buf_ofs = ofs;
				node = (void *)buf;
			}
			err = jffs2_scan_dirent_node(c, jeb, (void *)node, ofs, s);
			if (err) return err;
			ofs += PAD(je32_to_cpu(node->totlen));
			break;

#ifdef CONFIG_JFFS2_FS_XATTR
		case JFFS2_NODETYPE_XATTR:
			if (buf_ofs + buf_len < ofs + je32_to_cpu(node->totlen)) {
				buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs);
				D1(printk(KERN_DEBUG "Fewer than %d bytes (xattr node)"
					  " left to end of buf. Reading 0x%x at 0x%08x\n",
					  je32_to_cpu(node->totlen), buf_len, ofs));
				err = jffs2_fill_scan_buf(c, buf, ofs, buf_len);
				if (err)
					return err;
				buf_ofs = ofs;
				node = (void *)buf;
			}
			err = jffs2_scan_xattr_node(c, jeb, (void *)node, ofs, s);
			if (err)
				return err;
			ofs += PAD(je32_to_cpu(node->totlen));
			break;
		case JFFS2_NODETYPE_XREF:
			if (buf_ofs + buf_len < ofs + je32_to_cpu(node->totlen)) {
				buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs);
				D1(printk(KERN_DEBUG "Fewer than %d bytes (xref node)"
					  " left to end of buf. Reading 0x%x at 0x%08x\n",
					  je32_to_cpu(node->totlen), buf_len, ofs));
				err = jffs2_fill_scan_buf(c, buf, ofs, buf_len);
				if (err)
					return err;
				buf_ofs = ofs;
				node = (void *)buf;
			}
			err = jffs2_scan_xref_node(c, jeb, (void *)node, ofs, s);
			if (err)
				return err;
			ofs += PAD(je32_to_cpu(node->totlen));
			break;
#endif	/* CONFIG_JFFS2_FS_XATTR */

		case JFFS2_NODETYPE_CLEANMARKER:
			D1(printk(KERN_DEBUG "CLEANMARKER node found at 0x%08x\n", ofs));
			if (je32_to_cpu(node->totlen) != c->cleanmarker_size) {
				printk(KERN_NOTICE "CLEANMARKER node found at 0x%08x has totlen 0x%x != normal 0x%x\n",
				       ofs, je32_to_cpu(node->totlen), c->cleanmarker_size);
				if ((err = jffs2_scan_dirty_space(c, jeb, PAD(sizeof(struct jffs2_unknown_node)))))
					return err;
				ofs += PAD(sizeof(struct jffs2_unknown_node));
			} else if (jeb->first_node) {
				printk(KERN_NOTICE "CLEANMARKER node found at 0x%08x, not first node in block (0x%08x)\n", ofs, jeb->offset);
				if ((err = jffs2_scan_dirty_space(c, jeb, PAD(sizeof(struct jffs2_unknown_node)))))
					return err;
				ofs += PAD(sizeof(struct jffs2_unknown_node));
			} else {
				jffs2_link_node_ref(c, jeb, ofs | REF_NORMAL, c->cleanmarker_size, NULL);

				ofs += PAD(c->cleanmarker_size);
			}
			break;

		case JFFS2_NODETYPE_PADDING:
			if (jffs2_sum_active())
				jffs2_sum_add_padding_mem(s, je32_to_cpu(node->totlen));
			if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen)))))
				return err;
			ofs += PAD(je32_to_cpu(node->totlen));
			break;

		default:
			switch (je16_to_cpu(node->nodetype) & JFFS2_COMPAT_MASK) {
			case JFFS2_FEATURE_ROCOMPAT:
				printk(KERN_NOTICE "Read-only compatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs);
				c->flags |= JFFS2_SB_FLAG_RO;
				if (!(jffs2_is_readonly(c)))
					return -EROFS;
				if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen)))))
					return err;
				ofs += PAD(je32_to_cpu(node->totlen));
				break;

			case JFFS2_FEATURE_INCOMPAT:
				printk(KERN_NOTICE "Incompatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs);
				return -EINVAL;

			case JFFS2_FEATURE_RWCOMPAT_DELETE:
				D1(printk(KERN_NOTICE "Unknown but compatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs));
				if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen)))))
					return err;
				ofs += PAD(je32_to_cpu(node->totlen));
				break;

			case JFFS2_FEATURE_RWCOMPAT_COPY: {
				D1(printk(KERN_NOTICE "Unknown but compatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs));

				jffs2_link_node_ref(c, jeb, ofs | REF_PRISTINE, PAD(je32_to_cpu(node->totlen)), NULL);

				/* We can't summarise nodes we don't grok */
				jffs2_sum_disable_collecting(s);
				ofs += PAD(je32_to_cpu(node->totlen));
				break;
				}
			}
		}
	}

	if (jffs2_sum_active()) {
		if (PAD(s->sum_size + JFFS2_SUMMARY_FRAME_SIZE) > jeb->free_size) {
			dbg_summary("There is not enough space for "
				"summary information, disabling for this jeb!\n");
			jffs2_sum_disable_collecting(s);
		}
	}

	D1(printk(KERN_DEBUG "Block at 0x%08x: free 0x%08x, dirty 0x%08x, unchecked 0x%08x, used 0x%08x, wasted 0x%08x\n",
		  jeb->offset,jeb->free_size, jeb->dirty_size, jeb->unchecked_size, jeb->used_size, jeb->wasted_size));
	
	/* mark_node_obsolete can add to wasted !! */
	if (jeb->wasted_size) {
		jeb->dirty_size += jeb->wasted_size;
		c->dirty_size += jeb->wasted_size;
		c->wasted_size -= jeb->wasted_size;
		jeb->wasted_size = 0;
	}

	return jffs2_scan_classify_jeb(c, jeb);
}
Пример #9
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; 
#ifndef __ECOS
	size_t pointlen, try_size;

	ret = mtd_point(c->mtd, 0, c->mtd->size, &pointlen,
			(void **)&flashbuf, NULL);
	if (!ret && pointlen < c->mtd->size) {
		
		jffs2_dbg(1, "MTD point returned len too short: 0x%zx\n",
			  pointlen);
		mtd_unpoint(c->mtd, 0, pointlen);
		flashbuf = NULL;
	}
	if (ret && ret != -EOPNOTSUPP)
		jffs2_dbg(1, "MTD point failed %d\n", ret);
#endif
	if (!flashbuf) {
		if (jffs2_cleanmarker_oob(c))
			try_size = c->sector_size;
		else
			try_size = PAGE_SIZE;

		jffs2_dbg(1, "Trying to allocate readbuf of %zu "
			  "bytes\n", try_size);

		flashbuf = mtd_kmalloc_up_to(c->mtd, &try_size);
		if (!flashbuf)
			return -ENOMEM;

		jffs2_dbg(1, "Allocated readbuf of %zu bytes\n",
			  try_size);

		buf_size = (uint32_t)try_size;
	}

	if (jffs2_sum_active()) {
		s = kzalloc(sizeof(struct jffs2_summary), GFP_KERNEL);
		if (!s) {
			JFFS2_WARNING("Can't allocate memory for summary\n");
			ret = -ENOMEM;
			goto out;
		}
	}

	for (i=0; i<c->nr_blocks; i++) {
		struct jffs2_eraseblock *jeb = &c->blocks[i];

		cond_resched();

		
		jffs2_sum_reset_collected(s);

		ret = jffs2_scan_eraseblock(c, jeb, buf_size?flashbuf:(flashbuf+jeb->offset),
						buf_size, s);

		if (ret < 0)
			goto out;

		jffs2_dbg_acct_paranoia_check_nolock(c, jeb);

		
		switch(ret) {
		case BLK_STATE_ALLFF:
			empty_blocks++;
			list_add(&jeb->list, &c->erase_pending_list);
			c->nr_erasing_blocks++;
			break;

		case BLK_STATE_CLEANMARKER:
			
			if (!jeb->dirty_size) {
				
				list_add(&jeb->list, &c->free_list);
				c->nr_free_blocks++;
			} else {
				
				jffs2_dbg(1, "Adding all-dirty block at 0x%08x to erase_pending_list\n",
					  jeb->offset);
				list_add(&jeb->list, &c->erase_pending_list);
				c->nr_erasing_blocks++;
			}
			break;

		case BLK_STATE_CLEAN:
			
			list_add(&jeb->list, &c->clean_list);
			break;

		case BLK_STATE_PARTDIRTY:
			
			if (jeb->free_size > min_free(c) &&
					(!c->nextblock || c->nextblock->free_size < jeb->free_size)) {
				
				if (c->nextblock) {
					ret = file_dirty(c, c->nextblock);
					if (ret)
						goto out;
					
					jffs2_sum_reset_collected(c->summary);
				}
				
				jffs2_sum_move_collected(c, s);
				jffs2_dbg(1, "%s(): new nextblock = 0x%08x\n",
					  __func__, jeb->offset);
				c->nextblock = jeb;
			} else {
				ret = file_dirty(c, jeb);
				if (ret)
					goto out;
			}
			break;

		case BLK_STATE_ALLDIRTY:
			
			
			jffs2_dbg(1, "Erase block at 0x%08x is not formatted. It will be erased\n",
				  jeb->offset);
			list_add(&jeb->list, &c->erase_pending_list);
			c->nr_erasing_blocks++;
			break;

		case BLK_STATE_BADBLOCK:
			jffs2_dbg(1, "Block at 0x%08x is bad\n", jeb->offset);
			list_add(&jeb->list, &c->bad_list);
			c->bad_size += c->sector_size;
			c->free_size -= c->sector_size;
			bad_blocks++;
			break;
		default:
			pr_warn("%s(): unknown block state\n", __func__);
			BUG();
		}
	}

	
	if (c->nextblock && (c->nextblock->dirty_size)) {
		c->nextblock->wasted_size += c->nextblock->dirty_size;
		c->wasted_size += c->nextblock->dirty_size;
		c->dirty_size -= c->nextblock->dirty_size;
		c->nextblock->dirty_size = 0;
	}
#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
	if (!jffs2_can_mark_obsolete(c) && c->wbuf_pagesize && c->nextblock && (c->nextblock->free_size % c->wbuf_pagesize)) {

		uint32_t skip = c->nextblock->free_size % c->wbuf_pagesize;

		jffs2_dbg(1, "%s(): Skipping %d bytes in nextblock to ensure page alignment\n",
			  __func__, skip);
		jffs2_prealloc_raw_node_refs(c, c->nextblock, 1);
		jffs2_scan_dirty_space(c, c->nextblock, skip);
	}
#endif
	if (c->nr_erasing_blocks) {
		if ( !c->used_size && ((c->nr_free_blocks+empty_blocks+bad_blocks)!= c->nr_blocks || bad_blocks == c->nr_blocks) ) {
			pr_notice("Cowardly refusing to erase blocks on filesystem with no valid JFFS2 nodes\n");
			pr_notice("empty_blocks %d, bad_blocks %d, c->nr_blocks %d\n",
				  empty_blocks, bad_blocks, c->nr_blocks);
			ret = -EIO;
			goto out;
		}
		spin_lock(&c->erase_completion_lock);
		jffs2_garbage_collect_trigger(c);
		spin_unlock(&c->erase_completion_lock);
	}
	ret = 0;
 out:
	if (buf_size)
		kfree(flashbuf);
#ifndef __ECOS
	else
		mtd_unpoint(c->mtd, 0, c->mtd->size);
#endif
	kfree(s);
	return ret;
}
Пример #10
0
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) {
	struct jffs2_unknown_node *node;
	struct jffs2_unknown_node crcnode;
	uint32_t ofs, prevofs, max_ofs;
	uint32_t hdr_crc, buf_ofs, buf_len;
	int err;
	int noise = 0;


#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
	int cleanmarkerfound = 0;
#endif

	ofs = jeb->offset;
	prevofs = jeb->offset - 1;

	jffs2_dbg(1, "%s(): Scanning block at 0x%x\n", __func__, ofs);

#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
	if (jffs2_cleanmarker_oob(c)) {
		int ret;

		if (mtd_block_isbad(c->mtd, jeb->offset))
			return BLK_STATE_BADBLOCK;

		ret = jffs2_check_nand_cleanmarker(c, jeb);
		jffs2_dbg(2, "jffs_check_nand_cleanmarker returned %d\n", ret);

		switch (ret) {
		case 0:		cleanmarkerfound = 1; break;
		case 1: 	break;
		default: 	return ret;
		}
	}
#endif

	if (jffs2_sum_active()) {
		struct jffs2_sum_marker *sm;
		void *sumptr = NULL;
		uint32_t sumlen;
	      
		if (!buf_size) {
			
			sm = (void *)buf + c->sector_size - sizeof(*sm);
			if (je32_to_cpu(sm->magic) == JFFS2_SUM_MAGIC) {
				sumptr = buf + je32_to_cpu(sm->offset);
				sumlen = c->sector_size - je32_to_cpu(sm->offset);
			}
		} else {
			
			if (c->wbuf_pagesize)
				buf_len = c->wbuf_pagesize;
			else
				buf_len = sizeof(*sm);

			
			err = jffs2_fill_scan_buf(c, buf + buf_size - buf_len, 
						  jeb->offset + c->sector_size - buf_len,
						  buf_len);				
			if (err)
				return err;

			sm = (void *)buf + buf_size - sizeof(*sm);
			if (je32_to_cpu(sm->magic) == JFFS2_SUM_MAGIC) {
				sumlen = c->sector_size - je32_to_cpu(sm->offset);
				sumptr = buf + buf_size - sumlen;

				
				if (sumlen > buf_size) {
					
					sumptr = kmalloc(sumlen, GFP_KERNEL);
					if (!sumptr)
						return -ENOMEM;
					memcpy(sumptr + sumlen - buf_len, buf + buf_size - buf_len, buf_len);
				}
				if (buf_len < sumlen) {
					
					err = jffs2_fill_scan_buf(c, sumptr, 
								  jeb->offset + c->sector_size - sumlen,
								  sumlen - buf_len);				
					if (err)
						return err;
				}
			}

		}

		if (sumptr) {
			err = jffs2_sum_scan_sumnode(c, jeb, sumptr, sumlen, &pseudo_random);

			if (buf_size && sumlen > buf_size)
				kfree(sumptr);
			if (err)
				return err;
		}
	}

	buf_ofs = jeb->offset;

	if (!buf_size) {
		
		buf_len = c->sector_size;
	} else {
		buf_len = EMPTY_SCAN_SIZE(c->sector_size);
		err = jffs2_fill_scan_buf(c, buf, buf_ofs, buf_len);
		if (err)
			return err;
	}

	
	ofs = 0;
	max_ofs = EMPTY_SCAN_SIZE(c->sector_size);
	
	while(ofs < max_ofs && *(uint32_t *)(&buf[ofs]) == 0xFFFFFFFF)
		ofs += 4;

	if (ofs == max_ofs) {
#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
		if (jffs2_cleanmarker_oob(c)) {
			
			int ret = jffs2_check_oob_empty(c, jeb, cleanmarkerfound);
			jffs2_dbg(2, "jffs2_check_oob_empty returned %d\n",
				  ret);
			switch (ret) {
			case 0:		return cleanmarkerfound ? BLK_STATE_CLEANMARKER : BLK_STATE_ALLFF;
			case 1: 	return BLK_STATE_ALLDIRTY;
			default: 	return ret;
			}
		}
#endif
		jffs2_dbg(1, "Block at 0x%08x is empty (erased)\n",
			  jeb->offset);
		if (c->cleanmarker_size == 0)
			return BLK_STATE_CLEANMARKER;	
		else
			return BLK_STATE_ALLFF;	
	}
	if (ofs) {
		jffs2_dbg(1, "Free space at %08x ends at %08x\n", jeb->offset,
			  jeb->offset + ofs);
		if ((err = jffs2_prealloc_raw_node_refs(c, jeb, 1)))
			return err;
		if ((err = jffs2_scan_dirty_space(c, jeb, ofs)))
			return err;
	}

	
	ofs += jeb->offset;

	noise = 10;

	dbg_summary("no summary found in jeb 0x%08x. Apply original scan.\n",jeb->offset);

scan_more:
	while(ofs < jeb->offset + c->sector_size) {

		jffs2_dbg_acct_paranoia_check_nolock(c, jeb);

		
		err = jffs2_prealloc_raw_node_refs(c, jeb, 2);
		if (err)
			return err;

		cond_resched();

		if (ofs & 3) {
			pr_warn("Eep. ofs 0x%08x not word-aligned!\n", ofs);
			ofs = PAD(ofs);
			continue;
		}
		if (ofs == prevofs) {
			pr_warn("ofs 0x%08x has already been seen. Skipping\n",
				ofs);
			if ((err = jffs2_scan_dirty_space(c, jeb, 4)))
				return err;
			ofs += 4;
			continue;
		}
		prevofs = ofs;

		if (jeb->offset + c->sector_size < ofs + sizeof(*node)) {
			jffs2_dbg(1, "Fewer than %zd bytes left to end of block. (%x+%x<%x+%zx) Not reading\n",
				  sizeof(struct jffs2_unknown_node),
				  jeb->offset, c->sector_size, ofs,
				  sizeof(*node));
			if ((err = jffs2_scan_dirty_space(c, jeb, (jeb->offset + c->sector_size)-ofs)))
				return err;
			break;
		}

		if (buf_ofs + buf_len < ofs + sizeof(*node)) {
			buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs);
			jffs2_dbg(1, "Fewer than %zd bytes (node header) left to end of buf. Reading 0x%x at 0x%08x\n",
				  sizeof(struct jffs2_unknown_node),
				  buf_len, ofs);
			err = jffs2_fill_scan_buf(c, buf, ofs, buf_len);
			if (err)
				return err;
			buf_ofs = ofs;
		}

		node = (struct jffs2_unknown_node *)&buf[ofs-buf_ofs];

		if (*(uint32_t *)(&buf[ofs-buf_ofs]) == 0xffffffff) {
			uint32_t inbuf_ofs;
			uint32_t empty_start, scan_end;

			empty_start = ofs;
			ofs += 4;
			scan_end = min_t(uint32_t, EMPTY_SCAN_SIZE(c->sector_size)/8, buf_len);

			jffs2_dbg(1, "Found empty flash at 0x%08x\n", ofs);
		more_empty:
			inbuf_ofs = ofs - buf_ofs;
			while (inbuf_ofs < scan_end) {
				if (unlikely(*(uint32_t *)(&buf[inbuf_ofs]) != 0xffffffff)) {
					pr_warn("Empty flash at 0x%08x ends at 0x%08x\n",
						empty_start, ofs);
					if ((err = jffs2_scan_dirty_space(c, jeb, ofs-empty_start)))
						return err;
					goto scan_more;
				}

				inbuf_ofs+=4;
				ofs += 4;
			}
			
			jffs2_dbg(1, "Empty flash to end of buffer at 0x%08x\n",
				  ofs);

			if (buf_ofs == jeb->offset && jeb->used_size == PAD(c->cleanmarker_size) &&
			    c->cleanmarker_size && !jeb->dirty_size && !ref_next(jeb->first_node)) {
				jffs2_dbg(1, "%d bytes at start of block seems clean... assuming all clean\n",
					  EMPTY_SCAN_SIZE(c->sector_size));
				return BLK_STATE_CLEANMARKER;
			}
			if (!buf_size && (scan_end != buf_len)) {
				scan_end = buf_len;
				goto more_empty;
			}
			
			
			buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs);
			if (!buf_len) {
				jffs2_dbg(1, "Empty flash at %08x runs to end of block. Treating as free_space\n",
					  empty_start);
				break;
			}
			
			scan_end = buf_len;
			jffs2_dbg(1, "Reading another 0x%x at 0x%08x\n",
				  buf_len, ofs);
			err = jffs2_fill_scan_buf(c, buf, ofs, buf_len);
			if (err)
				return err;
			buf_ofs = ofs;
			goto more_empty;
		}

		if (ofs == jeb->offset && je16_to_cpu(node->magic) == KSAMTIB_CIGAM_2SFFJ) {
			pr_warn("Magic bitmask is backwards at offset 0x%08x. Wrong endian filesystem?\n",
				ofs);
			if ((err = jffs2_scan_dirty_space(c, jeb, 4)))
				return err;
			ofs += 4;
			continue;
		}
		if (je16_to_cpu(node->magic) == JFFS2_DIRTY_BITMASK) {
			jffs2_dbg(1, "Dirty bitmask at 0x%08x\n", ofs);
			if ((err = jffs2_scan_dirty_space(c, jeb, 4)))
				return err;
			ofs += 4;
			continue;
		}
		if (je16_to_cpu(node->magic) == JFFS2_OLD_MAGIC_BITMASK) {
			pr_warn("Old JFFS2 bitmask found at 0x%08x\n", ofs);
			pr_warn("You cannot use older JFFS2 filesystems with newer kernels\n");
			if ((err = jffs2_scan_dirty_space(c, jeb, 4)))
				return err;
			ofs += 4;
			continue;
		}
		if (je16_to_cpu(node->magic) != JFFS2_MAGIC_BITMASK) {
			
			noisy_printk(&noise, "%s(): Magic bitmask 0x%04x not found at 0x%08x: 0x%04x instead\n",
				     __func__,
				     JFFS2_MAGIC_BITMASK, ofs,
				     je16_to_cpu(node->magic));
			if ((err = jffs2_scan_dirty_space(c, jeb, 4)))
				return err;
			ofs += 4;
			continue;
		}
		
		crcnode.magic = node->magic;
		crcnode.nodetype = cpu_to_je16( je16_to_cpu(node->nodetype) | JFFS2_NODE_ACCURATE);
		crcnode.totlen = node->totlen;
		hdr_crc = crc32(0, &crcnode, sizeof(crcnode)-4);

		if (hdr_crc != je32_to_cpu(node->hdr_crc)) {
			noisy_printk(&noise, "%s(): Node at 0x%08x {0x%04x, 0x%04x, 0x%08x) has invalid CRC 0x%08x (calculated 0x%08x)\n",
				     __func__,
				     ofs, je16_to_cpu(node->magic),
				     je16_to_cpu(node->nodetype),
				     je32_to_cpu(node->totlen),
				     je32_to_cpu(node->hdr_crc),
				     hdr_crc);
			if ((err = jffs2_scan_dirty_space(c, jeb, 4)))
				return err;
			ofs += 4;
			continue;
		}

		if (ofs + je32_to_cpu(node->totlen) > jeb->offset + c->sector_size) {
			
			pr_warn("Node at 0x%08x with length 0x%08x would run over the end of the erase block\n",
				ofs, je32_to_cpu(node->totlen));
			pr_warn("Perhaps the file system was created with the wrong erase size?\n");
			if ((err = jffs2_scan_dirty_space(c, jeb, 4)))
				return err;
			ofs += 4;
			continue;
		}

		if (!(je16_to_cpu(node->nodetype) & JFFS2_NODE_ACCURATE)) {
			
			jffs2_dbg(2, "Node at 0x%08x is obsolete. Skipping\n",
				  ofs);
			if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen)))))
				return err;
			ofs += PAD(je32_to_cpu(node->totlen));
			continue;
		}

		switch(je16_to_cpu(node->nodetype)) {
		case JFFS2_NODETYPE_INODE:
			if (buf_ofs + buf_len < ofs + sizeof(struct jffs2_raw_inode)) {
				buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs);
				jffs2_dbg(1, "Fewer than %zd bytes (inode node) left to end of buf. Reading 0x%x at 0x%08x\n",
					  sizeof(struct jffs2_raw_inode),
					  buf_len, ofs);
				err = jffs2_fill_scan_buf(c, buf, ofs, buf_len);
				if (err)
					return err;
				buf_ofs = ofs;
				node = (void *)buf;
			}
			err = jffs2_scan_inode_node(c, jeb, (void *)node, ofs, s);
			if (err) return err;
			ofs += PAD(je32_to_cpu(node->totlen));
			break;

		case JFFS2_NODETYPE_DIRENT:
			if (buf_ofs + buf_len < ofs + je32_to_cpu(node->totlen)) {
				buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs);
				jffs2_dbg(1, "Fewer than %d bytes (dirent node) left to end of buf. Reading 0x%x at 0x%08x\n",
					  je32_to_cpu(node->totlen), buf_len,
					  ofs);
				err = jffs2_fill_scan_buf(c, buf, ofs, buf_len);
				if (err)
					return err;
				buf_ofs = ofs;
				node = (void *)buf;
			}
			err = jffs2_scan_dirent_node(c, jeb, (void *)node, ofs, s);
			if (err) return err;
			ofs += PAD(je32_to_cpu(node->totlen));
			break;

#ifdef CONFIG_JFFS2_FS_XATTR
		case JFFS2_NODETYPE_XATTR:
			if (buf_ofs + buf_len < ofs + je32_to_cpu(node->totlen)) {
				buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs);
				jffs2_dbg(1, "Fewer than %d bytes (xattr node) left to end of buf. Reading 0x%x at 0x%08x\n",
					  je32_to_cpu(node->totlen), buf_len,
					  ofs);
				err = jffs2_fill_scan_buf(c, buf, ofs, buf_len);
				if (err)
					return err;
				buf_ofs = ofs;
				node = (void *)buf;
			}
			err = jffs2_scan_xattr_node(c, jeb, (void *)node, ofs, s);
			if (err)
				return err;
			ofs += PAD(je32_to_cpu(node->totlen));
			break;
		case JFFS2_NODETYPE_XREF:
			if (buf_ofs + buf_len < ofs + je32_to_cpu(node->totlen)) {
				buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs);
				jffs2_dbg(1, "Fewer than %d bytes (xref node) left to end of buf. Reading 0x%x at 0x%08x\n",
					  je32_to_cpu(node->totlen), buf_len,
					  ofs);
				err = jffs2_fill_scan_buf(c, buf, ofs, buf_len);
				if (err)
					return err;
				buf_ofs = ofs;
				node = (void *)buf;
			}
			err = jffs2_scan_xref_node(c, jeb, (void *)node, ofs, s);
			if (err)
				return err;
			ofs += PAD(je32_to_cpu(node->totlen));
			break;
#endif	

		case JFFS2_NODETYPE_CLEANMARKER:
			jffs2_dbg(1, "CLEANMARKER node found at 0x%08x\n", ofs);
			if (je32_to_cpu(node->totlen) != c->cleanmarker_size) {
				pr_notice("CLEANMARKER node found at 0x%08x has totlen 0x%x != normal 0x%x\n",
					  ofs, je32_to_cpu(node->totlen),
					  c->cleanmarker_size);
				if ((err = jffs2_scan_dirty_space(c, jeb, PAD(sizeof(struct jffs2_unknown_node)))))
					return err;
				ofs += PAD(sizeof(struct jffs2_unknown_node));
			} else if (jeb->first_node) {
				pr_notice("CLEANMARKER node found at 0x%08x, not first node in block (0x%08x)\n",
					  ofs, jeb->offset);
				if ((err = jffs2_scan_dirty_space(c, jeb, PAD(sizeof(struct jffs2_unknown_node)))))
					return err;
				ofs += PAD(sizeof(struct jffs2_unknown_node));
			} else {
				jffs2_link_node_ref(c, jeb, ofs | REF_NORMAL, c->cleanmarker_size, NULL);

				ofs += PAD(c->cleanmarker_size);
			}
			break;

		case JFFS2_NODETYPE_PADDING:
			if (jffs2_sum_active())
				jffs2_sum_add_padding_mem(s, je32_to_cpu(node->totlen));
			if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen)))))
				return err;
			ofs += PAD(je32_to_cpu(node->totlen));
			break;

		default:
			switch (je16_to_cpu(node->nodetype) & JFFS2_COMPAT_MASK) {
			case JFFS2_FEATURE_ROCOMPAT:
				pr_notice("Read-only compatible feature node (0x%04x) found at offset 0x%08x\n",
					  je16_to_cpu(node->nodetype), ofs);
				c->flags |= JFFS2_SB_FLAG_RO;
				if (!(jffs2_is_readonly(c)))
					return -EROFS;
				if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen)))))
					return err;
				ofs += PAD(je32_to_cpu(node->totlen));
				break;

			case JFFS2_FEATURE_INCOMPAT:
				pr_notice("Incompatible feature node (0x%04x) found at offset 0x%08x\n",
					  je16_to_cpu(node->nodetype), ofs);
				return -EINVAL;

			case JFFS2_FEATURE_RWCOMPAT_DELETE:
				jffs2_dbg(1, "Unknown but compatible feature node (0x%04x) found at offset 0x%08x\n",
					  je16_to_cpu(node->nodetype), ofs);
				if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen)))))
					return err;
				ofs += PAD(je32_to_cpu(node->totlen));
				break;

			case JFFS2_FEATURE_RWCOMPAT_COPY: {
				jffs2_dbg(1, "Unknown but compatible feature node (0x%04x) found at offset 0x%08x\n",
					  je16_to_cpu(node->nodetype), ofs);

				jffs2_link_node_ref(c, jeb, ofs | REF_PRISTINE, PAD(je32_to_cpu(node->totlen)), NULL);

				
				jffs2_sum_disable_collecting(s);
				ofs += PAD(je32_to_cpu(node->totlen));
				break;
				}
			}
		}
	}

	if (jffs2_sum_active()) {
		if (PAD(s->sum_size + JFFS2_SUMMARY_FRAME_SIZE) > jeb->free_size) {
			dbg_summary("There is not enough space for "
				"summary information, disabling for this jeb!\n");
			jffs2_sum_disable_collecting(s);
		}
	}

	jffs2_dbg(1, "Block at 0x%08x: free 0x%08x, dirty 0x%08x, unchecked 0x%08x, used 0x%08x, wasted 0x%08x\n",
		  jeb->offset, jeb->free_size, jeb->dirty_size,
		  jeb->unchecked_size, jeb->used_size, jeb->wasted_size);
	
	
	if (jeb->wasted_size) {
		jeb->dirty_size += jeb->wasted_size;
		c->dirty_size += jeb->wasted_size;
		c->wasted_size -= jeb->wasted_size;
		jeb->wasted_size = 0;
	}

	return jffs2_scan_classify_jeb(c, jeb);
}