static int jffs2_scan_xattr_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, struct jffs2_raw_xattr *rx, uint32_t ofs, struct jffs2_summary *s) { struct jffs2_xattr_datum *xd; uint32_t xid, version, totlen, crc; int err; crc = crc32(0, rx, sizeof(struct jffs2_raw_xattr) - 4); if (crc != je32_to_cpu(rx->node_crc)) { JFFS2_WARNING("node CRC failed at %#08x, read=%#08x, calc=%#08x\n", ofs, je32_to_cpu(rx->node_crc), crc); if ((err = jffs2_scan_dirty_space(c, jeb, je32_to_cpu(rx->totlen)))) return err; return 0; } xid = je32_to_cpu(rx->xid); version = je32_to_cpu(rx->version); totlen = PAD(sizeof(struct jffs2_raw_xattr) + rx->name_len + 1 + je16_to_cpu(rx->value_len)); if (totlen != je32_to_cpu(rx->totlen)) { JFFS2_WARNING("node length mismatch at %#08x, read=%u, calc=%u\n", ofs, je32_to_cpu(rx->totlen), totlen); if ((err = jffs2_scan_dirty_space(c, jeb, je32_to_cpu(rx->totlen)))) return err; return 0; } xd = jffs2_setup_xattr_datum(c, xid, version); if (IS_ERR(xd)) return PTR_ERR(xd); if (xd->version > version) { struct jffs2_raw_node_ref *raw = jffs2_link_node_ref(c, jeb, ofs | REF_PRISTINE, totlen, NULL); raw->next_in_ino = xd->node->next_in_ino; xd->node->next_in_ino = raw; } else { xd->version = version; xd->xprefix = rx->xprefix; xd->name_len = rx->name_len; xd->value_len = je16_to_cpu(rx->value_len); xd->data_crc = je32_to_cpu(rx->data_crc); jffs2_link_node_ref(c, jeb, ofs | REF_PRISTINE, totlen, (void *)xd); } if (jffs2_sum_active()) jffs2_sum_add_xattr_mem(s, rx, ofs - jeb->offset); dbg_xattr("scaning xdatum at %#08x (xid=%u, version=%u)\n", ofs, xd->xid, xd->version); return 0; }
static int jffs2_scan_xref_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, struct jffs2_raw_xref *rr, uint32_t ofs, struct jffs2_summary *s) { struct jffs2_xattr_ref *ref; uint32_t crc; int err; crc = crc32(0, rr, sizeof(*rr) - 4); if (crc != je32_to_cpu(rr->node_crc)) { JFFS2_WARNING("node CRC failed at %#08x, read=%#08x, calc=%#08x\n", ofs, je32_to_cpu(rr->node_crc), crc); if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(rr->totlen))))) return err; return 0; } if (PAD(sizeof(struct jffs2_raw_xref)) != je32_to_cpu(rr->totlen)) { JFFS2_WARNING("node length mismatch at %#08x, read=%u, calc=%zd\n", ofs, je32_to_cpu(rr->totlen), PAD(sizeof(struct jffs2_raw_xref))); if ((err = jffs2_scan_dirty_space(c, jeb, je32_to_cpu(rr->totlen)))) return err; return 0; } ref = jffs2_alloc_xattr_ref(); if (!ref) return -ENOMEM; /* BEFORE jffs2_build_xattr_subsystem() called, * and AFTER xattr_ref is marked as a dead xref, * ref->xid is used to store 32bit xid, xd is not used * ref->ino is used to store 32bit inode-number, ic is not used * Thoes variables are declared as union, thus using those * are exclusive. In a similar way, ref->next is temporarily * used to chain all xattr_ref object. It's re-chained to * jffs2_inode_cache in jffs2_build_xattr_subsystem() correctly. */ ref->ino = je32_to_cpu(rr->ino); ref->xid = je32_to_cpu(rr->xid); ref->xseqno = je32_to_cpu(rr->xseqno); if (ref->xseqno > c->highest_xseqno) c->highest_xseqno = (ref->xseqno & ~XREF_DELETE_MARKER); ref->next = c->xref_temp; c->xref_temp = ref; jffs2_link_node_ref(c, jeb, ofs | REF_PRISTINE, PAD(je32_to_cpu(rr->totlen)), (void *)ref); if (jffs2_sum_active()) jffs2_sum_add_xref_mem(s, rr, ofs - jeb->offset); dbg_xattr("scan xref at %#08x (xid=%u, ino=%u)\n", ofs, ref->xid, ref->ino); return 0; }
static int jffs2_scan_inode_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, struct jffs2_raw_inode *ri, uint32_t ofs, struct jffs2_summary *s) { struct jffs2_inode_cache *ic; uint32_t crc, ino = je32_to_cpu(ri->ino); D1(printk(KERN_DEBUG "jffs2_scan_inode_node(): Node at 0x%08x\n", ofs)); /* We do very little here now. Just check the ino# to which we should attribute this node; we can do all the CRC checking etc. later. There's a tradeoff here -- we used to scan the flash once only, reading everything we want from it into memory, then building all our in-core data structures and freeing the extra information. Now we allow the first part of the mount to complete a lot quicker, but we have to go _back_ to the flash in order to finish the CRC checking, etc. Which means that the _full_ amount of time to get to proper write mode with GC operational may actually be _longer_ than before. Sucks to be me. */ /* Check the node CRC in any case. */ crc = crc32(0, ri, sizeof(*ri)-8); if (crc != je32_to_cpu(ri->node_crc)) { printk(KERN_NOTICE "jffs2_scan_inode_node(): CRC failed on " "node at 0x%08x: Read 0x%08x, calculated 0x%08x\n", ofs, je32_to_cpu(ri->node_crc), crc); /* * We believe totlen because the CRC on the node * _header_ was OK, just the node itself failed. */ return jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(ri->totlen))); } ic = jffs2_get_ino_cache(c, ino); if (!ic) { ic = jffs2_scan_make_ino_cache(c, ino); if (!ic) return -ENOMEM; } /* Wheee. It worked */ jffs2_link_node_ref(c, jeb, ofs | REF_UNCHECKED, PAD(je32_to_cpu(ri->totlen)), ic); D1(printk(KERN_DEBUG "Node is ino #%u, version %d. Range 0x%x-0x%x\n", je32_to_cpu(ri->ino), je32_to_cpu(ri->version), je32_to_cpu(ri->offset), je32_to_cpu(ri->offset)+je32_to_cpu(ri->dsize))); pseudo_random += je32_to_cpu(ri->version); if (jffs2_sum_active()) { jffs2_sum_add_inode_mem(s, ri, ofs - jeb->offset); } return 0; }
static struct jffs2_raw_node_ref *sum_link_node_ref(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, uint32_t ofs, uint32_t len, struct jffs2_inode_cache *ic) { /* If there was a gap, mark it dirty */ if ((ofs & ~3) > c->sector_size - jeb->free_size) { /* Ew. Summary doesn't actually tell us explicitly about dirty space */ jffs2_scan_dirty_space(c, jeb, (ofs & ~3) - (c->sector_size - jeb->free_size)); } return jffs2_link_node_ref(c, jeb, jeb->offset + ofs, len, ic); }
static int jffs2_scan_xref_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, struct jffs2_raw_xref *rr, uint32_t ofs, struct jffs2_summary *s) { struct jffs2_xattr_ref *ref; uint32_t crc; int err; crc = crc32(0, rr, sizeof(*rr) - 4); if (crc != je32_to_cpu(rr->node_crc)) { JFFS2_WARNING("node CRC failed at %#08x, read=%#08x, calc=%#08x\n", ofs, je32_to_cpu(rr->node_crc), crc); if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(rr->totlen))))) return err; return 0; } if (PAD(sizeof(struct jffs2_raw_xref)) != je32_to_cpu(rr->totlen)) { JFFS2_WARNING("node length mismatch at %#08x, read=%u, calc=%zd\n", ofs, je32_to_cpu(rr->totlen), PAD(sizeof(struct jffs2_raw_xref))); if ((err = jffs2_scan_dirty_space(c, jeb, je32_to_cpu(rr->totlen)))) return err; return 0; } ref = jffs2_alloc_xattr_ref(); if (!ref) return -ENOMEM; ref->ino = je32_to_cpu(rr->ino); ref->xid = je32_to_cpu(rr->xid); ref->xseqno = je32_to_cpu(rr->xseqno); if (ref->xseqno > c->highest_xseqno) c->highest_xseqno = (ref->xseqno & ~XREF_DELETE_MARKER); ref->next = c->xref_temp; c->xref_temp = ref; jffs2_link_node_ref(c, jeb, ofs | REF_PRISTINE, PAD(je32_to_cpu(rr->totlen)), (void *)ref); if (jffs2_sum_active()) jffs2_sum_add_xref_mem(s, rr, ofs - jeb->offset); dbg_xattr("scan xref at %#08x (xid=%u, ino=%u)\n", ofs, ref->xid, ref->ino); return 0; }
static int jffs2_scan_inode_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, struct jffs2_raw_inode *ri, uint32_t ofs, struct jffs2_summary *s) { struct jffs2_inode_cache *ic; uint32_t crc, ino = je32_to_cpu(ri->ino); jffs2_dbg(1, "%s(): Node at 0x%08x\n", __func__, ofs); crc = crc32(0, ri, sizeof(*ri)-8); if (crc != je32_to_cpu(ri->node_crc)) { pr_notice("%s(): CRC failed on node at 0x%08x: Read 0x%08x, calculated 0x%08x\n", __func__, ofs, je32_to_cpu(ri->node_crc), crc); return jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(ri->totlen))); } ic = jffs2_get_ino_cache(c, ino); if (!ic) { ic = jffs2_scan_make_ino_cache(c, ino); if (!ic) return -ENOMEM; } jffs2_link_node_ref(c, jeb, ofs | REF_UNCHECKED, PAD(je32_to_cpu(ri->totlen)), ic); jffs2_dbg(1, "Node is ino #%u, version %d. Range 0x%x-0x%x\n", je32_to_cpu(ri->ino), je32_to_cpu(ri->version), je32_to_cpu(ri->offset), je32_to_cpu(ri->offset)+je32_to_cpu(ri->dsize)); pseudo_random += je32_to_cpu(ri->version); if (jffs2_sum_active()) { jffs2_sum_add_inode_mem(s, ri, ofs - jeb->offset); } return 0; }
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; if (padsize + datasize > MAX_SUMMARY_SIZE) { /* It won't fit in the buffer. Abort summary for this jeb */ jffs2_sum_disable_collecting(c->summary); JFFS2_WARNING("Summary too big (%d data, %d pad) in eraseblock at %08x\n", datasize, padsize, jeb->offset); /* Non-fatal */ return 0; } /* 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); /* Non-fatal */ return 0; } 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("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; }
/* 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; }
/* 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); }
static int jffs2_scan_dirent_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, struct jffs2_raw_dirent *rd, uint32_t ofs, struct jffs2_summary *s) { struct jffs2_full_dirent *fd; struct jffs2_inode_cache *ic; uint32_t checkedlen; uint32_t crc; int err; D1(printk(KERN_DEBUG "jffs2_scan_dirent_node(): Node at 0x%08x\n", ofs)); /* We don't get here unless the node is still valid, so we don't have to mask in the ACCURATE bit any more. */ crc = crc32(0, rd, sizeof(*rd)-8); if (crc != je32_to_cpu(rd->node_crc)) { printk(KERN_NOTICE "jffs2_scan_dirent_node(): Node CRC failed on node at 0x%08x: Read 0x%08x, calculated 0x%08x\n", ofs, je32_to_cpu(rd->node_crc), crc); /* We believe totlen because the CRC on the node _header_ was OK, just the node itself failed. */ if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(rd->totlen))))) return err; return 0; } pseudo_random += je32_to_cpu(rd->version); /* Should never happen. Did. (OLPC trac #4184)*/ checkedlen = strnlen(rd->name, rd->nsize); if (checkedlen < rd->nsize) { printk(KERN_ERR "Dirent at %08x has zeroes in name. Truncating to %d chars\n", ofs, checkedlen); } fd = jffs2_alloc_full_dirent(checkedlen+1); if (!fd) { return -ENOMEM; } memcpy(&fd->name, rd->name, checkedlen); fd->name[checkedlen] = 0; crc = crc32(0, fd->name, rd->nsize); if (crc != je32_to_cpu(rd->name_crc)) { printk(KERN_NOTICE "jffs2_scan_dirent_node(): Name CRC failed on node at 0x%08x: Read 0x%08x, calculated 0x%08x\n", ofs, je32_to_cpu(rd->name_crc), crc); D1(printk(KERN_NOTICE "Name for which CRC failed is (now) '%s', ino #%d\n", fd->name, je32_to_cpu(rd->ino))); jffs2_free_full_dirent(fd); /* FIXME: Why do we believe totlen? */ /* We believe totlen because the CRC on the node _header_ was OK, just the name failed. */ if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(rd->totlen))))) return err; return 0; } ic = jffs2_scan_make_ino_cache(c, je32_to_cpu(rd->pino)); if (!ic) { jffs2_free_full_dirent(fd); return -ENOMEM; } fd->raw = jffs2_link_node_ref(c, jeb, ofs | dirent_node_state(rd), PAD(je32_to_cpu(rd->totlen)), ic); fd->next = NULL; fd->version = je32_to_cpu(rd->version); fd->ino = je32_to_cpu(rd->ino); fd->nhash = full_name_hash(fd->name, checkedlen); fd->type = rd->type; jffs2_add_fd_to_list(c, fd, &ic->scan_dents); if (jffs2_sum_active()) { jffs2_sum_add_dirent_mem(s, rd, ofs - jeb->offset); } return 0; }
static int jffs2_scan_dirent_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, struct jffs2_raw_dirent *rd, uint32_t ofs, struct jffs2_summary *s) { struct jffs2_full_dirent *fd; struct jffs2_inode_cache *ic; uint32_t checkedlen; uint32_t crc; int err; jffs2_dbg(1, "%s(): Node at 0x%08x\n", __func__, ofs); crc = crc32(0, rd, sizeof(*rd)-8); if (crc != je32_to_cpu(rd->node_crc)) { pr_notice("%s(): Node CRC failed on node at 0x%08x: Read 0x%08x, calculated 0x%08x\n", __func__, ofs, je32_to_cpu(rd->node_crc), crc); if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(rd->totlen))))) return err; return 0; } pseudo_random += je32_to_cpu(rd->version); checkedlen = strnlen(rd->name, rd->nsize); if (checkedlen < rd->nsize) { pr_err("Dirent at %08x has zeroes in name. Truncating to %d chars\n", ofs, checkedlen); } fd = jffs2_alloc_full_dirent(checkedlen+1); if (!fd) { return -ENOMEM; } memcpy(&fd->name, rd->name, checkedlen); fd->name[checkedlen] = 0; crc = crc32(0, fd->name, rd->nsize); if (crc != je32_to_cpu(rd->name_crc)) { pr_notice("%s(): Name CRC failed on node at 0x%08x: Read 0x%08x, calculated 0x%08x\n", __func__, ofs, je32_to_cpu(rd->name_crc), crc); jffs2_dbg(1, "Name for which CRC failed is (now) '%s', ino #%d\n", fd->name, je32_to_cpu(rd->ino)); jffs2_free_full_dirent(fd); if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(rd->totlen))))) return err; return 0; } ic = jffs2_scan_make_ino_cache(c, je32_to_cpu(rd->pino)); if (!ic) { jffs2_free_full_dirent(fd); return -ENOMEM; } fd->raw = jffs2_link_node_ref(c, jeb, ofs | dirent_node_state(rd), PAD(je32_to_cpu(rd->totlen)), ic); fd->next = NULL; fd->version = je32_to_cpu(rd->version); fd->ino = je32_to_cpu(rd->ino); fd->nhash = full_name_hash(fd->name, checkedlen); fd->type = rd->type; jffs2_add_fd_to_list(c, fd, &ic->scan_dents); if (jffs2_sum_active()) { jffs2_sum_add_dirent_mem(s, rd, ofs - jeb->offset); } return 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); }