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_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_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; }