summary.c

linux 内核源代码

			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) {
					printk(KERN_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) {
					printk(KERN_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(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;
}

/* 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;
}

/* 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];
	uint32_t sum_ofs;
	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;
			}
#ifdef CONFIG_JFFS2_FS_XATTR
			case JFFS2_NODETYPE_XATTR: {
				struct jffs2_sum_xattr_flash *sxattr_ptr = wpage;

				temp = c->summary->sum_list_head;
				sxattr_ptr->nodetype = temp->x.nodetype;
				sxattr_ptr->xid = temp->x.xid;
				sxattr_ptr->version = temp->x.version;
				sxattr_ptr->offset = temp->x.offset;
				sxattr_ptr->totlen = temp->x.totlen;

				wpage += JFFS2_SUMMARY_XATTR_SIZE;
				break;
			}
			case JFFS2_NODETYPE_XREF: {
				struct jffs2_sum_xref_flash *sxref_ptr = wpage;

				temp = c->summary->sum_list_head;
				sxref_ptr->nodetype = temp->r.nodetype;
				sxref_ptr->offset = temp->r.offset;

				wpage += JFFS2_SUMMARY_XREF_SIZE;
				break;
			}
#endif
			default : {
				if ((je16_to_cpu(temp->u.nodetype) & JFFS2_COMPAT_MASK)
				    == JFFS2_FEATURE_RWCOMPAT_COPY) {
					dbg_summary("Writing unknown RWCOMPAT_COPY node type %x\n",
						    je16_to_cpu(temp->u.nodetype));
					jffs2_sum_disable_collecting(c->summary);
				} else {
					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;

	sum_ofs = jeb->offset + c->sector_size - jeb->free_size;

	dbg_summary("JFFS2: writing out data to flash to pos : 0x%08x\n",
		    sum_ofs);

	ret = jffs2_flash_writev(c, vecs, 2, sum_ofs, &retlen, 0);

	if (ret || (retlen != infosize)) {

		JFFS2_WARNING("Write of %u bytes at 0x%08x failed. returned %d, retlen %zd\n",
			      infosize, sum_ofs, ret, retlen);

		if (retlen) {
			/* Waste remaining space */
			spin_lock(&c->erase_completion_lock);
			jffs2_link_node_ref(c, jeb, sum_ofs | REF_OBSOLETE, infosize, NULL);
			spin_unlock(&c->erase_completion_lock);
		}

		c->summary->sum_size = JFFS2_SUMMARY_NOSUM_SIZE;

		return 0;
	}

	spin_lock(&c->erase_completion_lock);
	jffs2_link_node_ref(c, jeb, sum_ofs | REF_NORMAL, infosize, NULL);
	spin_unlock(&c->erase_completion_lock);

	return 0;
}

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

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;
}