/** * efi_partition(struct parsed_partitions *state) * @state * * Description: called from check.c, if the disk contains GPT * partitions, sets up partition entries in the kernel. * * If the first block on the disk is a legacy MBR, * it will get handled by msdos_partition(). * If it's a Protective MBR, we'll handle it here. * * We do not create a Linux partition for GPT, but * only for the actual data partitions. * Returns: * -1 if unable to read the partition table * 0 if this isn't our partition table * 1 if successful * */ int efi_partition(struct parsed_partitions *state) { gpt_header *gpt = NULL; gpt_entry *ptes = NULL; u32 i; unsigned ssz = bdev_logical_block_size(state->bdev) / 512; u8 unparsed_guid[37]; if (!find_valid_gpt(state, &gpt, &ptes) || !gpt || !ptes) { kfree(gpt); kfree(ptes); return 0; } pr_debug("GUID Partition Table is valid! Yea!\n"); for (i = 0; i < le32_to_cpu(gpt->num_partition_entries) && i < state->limit-1; i++) { struct partition_meta_info *info; unsigned label_count = 0; unsigned label_max; u64 start = le64_to_cpu(ptes[i].starting_lba); u64 size = le64_to_cpu(ptes[i].ending_lba) - le64_to_cpu(ptes[i].starting_lba) + 1ULL; if (!is_pte_valid(&ptes[i], last_lba(state->bdev))) continue; put_partition(state, i+1, start * ssz, size * ssz); /* If this is a RAID volume, tell md */ if (!efi_guidcmp(ptes[i].partition_type_guid, PARTITION_LINUX_RAID_GUID)) state->parts[i + 1].flags = ADDPART_FLAG_RAID; info = &state->parts[i + 1].info; /* Instead of doing a manual swap to big endian, reuse the * common ASCII hex format as the interim. */ efi_guid_unparse(&ptes[i].unique_partition_guid, unparsed_guid); part_pack_uuid(unparsed_guid, info->uuid); /* Naively convert UTF16-LE to 7 bits. */ label_max = min(sizeof(info->volname) - 1, sizeof(ptes[i].partition_name)); info->volname[label_max] = 0; while (label_count < label_max) { u8 c = ptes[i].partition_name[label_count] & 0xff; if (c && !isprint(c)) c = '!'; info->volname[label_count] = c; label_count++; } state->parts[i + 1].has_info = true; } kfree(ptes); kfree(gpt); strlcat(state->pp_buf, "\n", PAGE_SIZE); return 1; }
/** * devt_from_partuuid - looks up the dev_t of a partition by its UUID * @uuid: min 36 byte char array containing a hex ascii UUID * * The function will return the first partition which contains a matching * UUID value in its partition_meta_info struct. This does not search * by filesystem UUIDs. * * If @uuid is followed by a "/PARTNROFF=%d", then the number will be * extracted and used as an offset from the partition identified by the UUID. * * Returns the matching dev_t on success or 0 on failure. */ static dev_t devt_from_partuuid(char *uuid_str) { dev_t res = 0; struct device *dev = NULL; u8 uuid[16]; struct gendisk *disk; struct hd_struct *part; int offset = 0; if (strlen(uuid_str) < 36) goto done; /* Check for optional partition number offset attributes. */ if (uuid_str[36]) { char c = 0; /* Explicitly fail on poor PARTUUID syntax. */ if (sscanf(&uuid_str[36], "/PARTNROFF=%d%c", &offset, &c) != 1) { printk(KERN_ERR "VFS: PARTUUID= is invalid.\n" "Expected PARTUUID=<valid-uuid-id>[/PARTNROFF=%%d]\n"); if (root_wait) printk(KERN_ERR "Disabling rootwait; root= is invalid.\n"); root_wait = 0; goto done; } } /* Pack the requested UUID in the expected format. */ part_pack_uuid(uuid_str, uuid); dev = class_find_device(&block_class, NULL, uuid, &match_dev_by_uuid); if (!dev) goto done; res = dev->devt; /* Attempt to find the partition by offset. */ if (!offset) goto no_offset; res = 0; disk = part_to_disk(dev_to_part(dev)); part = disk_get_part(disk, dev_to_part(dev)->partno + offset); if (part) { res = part_devt(part); put_device(part_to_dev(part)); } no_offset: put_device(dev); done: return res; }
/** * devt_from_partuuid - looks up the dev_t of a partition by its UUID * @uuid: 36 byte char array containing a hex ascii UUID * * The function will return the first partition which contains a matching * UUID value in its partition_meta_info struct. This does not search * by filesystem UUIDs. * * Returns the matching dev_t on success or 0 on failure. */ static dev_t devt_from_partuuid(char *uuid_str) { dev_t res = 0; struct device *dev = NULL; u8 uuid[16]; /* Pack the requested UUID in the expected format. */ part_pack_uuid(uuid_str, uuid); dev = class_find_device(&block_class, NULL, uuid, &match_dev_by_uuid); if (!dev) goto done; res = dev->devt; put_device(dev); done: return res; }
/** * find_valid_gpt() - Search disk for valid GPT headers and PTEs * @state * @gpt is a GPT header ptr, filled on return. * @ptes is a PTEs ptr, filled on return. * Description: Returns 1 if valid, 0 on error. * If valid, returns pointers to newly allocated GPT header and PTEs. * Validity depends on PMBR being valid (or being overridden by the * 'gpt' kernel command line option) and finding either the Primary * GPT header and PTEs valid, or the Alternate GPT header and PTEs * valid. If the Primary GPT header is not valid, the Alternate GPT header * is not checked unless the 'gpt' kernel command line option is passed. * This protects against devices which misreport their size, and forces * the user to decide to use the Alternate GPT. */ static int find_valid_gpt(struct parsed_partitions *state, gpt_header **gpt, gpt_entry **ptes) { int good_pgpt = 0, good_agpt = 0, good_pmbr = 0; gpt_header *pgpt = NULL, *agpt = NULL; gpt_entry *pptes = NULL, *aptes = NULL; legacy_mbr *legacymbr; u64 lastlba; if (!ptes) return 0; lastlba = last_lba(state->bdev); #if 0 // merged from msm8960-gb by ZTE_BOOT_JIA_20120105 jia.jia if (!force_gpt) { #else if (force_gpt) { #endif /* This will be added to the EFI Spec. per Intel after v1.02. */ legacymbr = kzalloc(sizeof (*legacymbr), GFP_KERNEL); if (legacymbr) { read_lba(state, 0, (u8 *) legacymbr, sizeof (*legacymbr)); good_pmbr = is_pmbr_valid(legacymbr); kfree(legacymbr); } if (!good_pmbr) goto fail; } good_pgpt = is_gpt_valid(state, GPT_PRIMARY_PARTITION_TABLE_LBA, &pgpt, &pptes); if (good_pgpt) good_agpt = is_gpt_valid(state, le64_to_cpu(pgpt->alternate_lba), &agpt, &aptes); if (!good_agpt && force_gpt) good_agpt = is_gpt_valid(state, lastlba, &agpt, &aptes); /* The obviously unsuccessful case */ if (!good_pgpt && !good_agpt) goto fail; compare_gpts(pgpt, agpt, lastlba); /* The good cases */ if (good_pgpt) { *gpt = pgpt; *ptes = pptes; kfree(agpt); kfree(aptes); if (!good_agpt) { printk(KERN_WARNING "Alternate GPT is invalid, " "using primary GPT.\n"); } return 1; } else if (good_agpt) { *gpt = agpt; *ptes = aptes; kfree(pgpt); kfree(pptes); printk(KERN_WARNING "Primary GPT is invalid, using alternate GPT.\n"); return 1; } fail: kfree(pgpt); kfree(agpt); kfree(pptes); kfree(aptes); *gpt = NULL; *ptes = NULL; return 0; } /** * efi_partition(struct parsed_partitions *state) * @state * * Description: called from check.c, if the disk contains GPT * partitions, sets up partition entries in the kernel. * * If the first block on the disk is a legacy MBR, * it will get handled by msdos_partition(). * If it's a Protective MBR, we'll handle it here. * * We do not create a Linux partition for GPT, but * only for the actual data partitions. * Returns: * -1 if unable to read the partition table * 0 if this isn't our partition table * 1 if successful * */ int efi_partition(struct parsed_partitions *state) { gpt_header *gpt = NULL; gpt_entry *ptes = NULL; u32 i; unsigned ssz = bdev_logical_block_size(state->bdev) / 512; u8 unparsed_guid[37]; if (!find_valid_gpt(state, &gpt, &ptes) || !gpt || !ptes) { kfree(gpt); kfree(ptes); return 0; } pr_debug("GUID Partition Table is valid! Yea!\n"); for (i = 0; i < le32_to_cpu(gpt->num_partition_entries) && i < state->limit-1; i++) { struct partition_meta_info *info; unsigned label_count = 0; unsigned label_max; u64 start = le64_to_cpu(ptes[i].starting_lba); u64 size = le64_to_cpu(ptes[i].ending_lba) - le64_to_cpu(ptes[i].starting_lba) + 1ULL; if (!is_pte_valid(&ptes[i], last_lba(state->bdev))) continue; put_partition(state, i+1, start * ssz, size * ssz); /* If this is a RAID volume, tell md */ if (!efi_guidcmp(ptes[i].partition_type_guid, PARTITION_LINUX_RAID_GUID)) state->parts[i + 1].flags = ADDPART_FLAG_RAID; info = &state->parts[i + 1].info; /* Instead of doing a manual swap to big endian, reuse the * common ASCII hex format as the interim. */ efi_guid_unparse(&ptes[i].unique_partition_guid, unparsed_guid); part_pack_uuid(unparsed_guid, info->uuid); /* Naively convert UTF16-LE to 7 bits. */ label_max = min(sizeof(info->volname) - 1, sizeof(ptes[i].partition_name)); info->volname[label_max] = 0; while (label_count < label_max) { u8 c = ptes[i].partition_name[label_count] & 0xff; if (c && !isprint(c)) c = '!'; info->volname[label_count] = c; label_count++; } state->parts[i + 1].has_info = true; } kfree(ptes); kfree(gpt); strlcat(state->pp_buf, "\n", PAGE_SIZE); return 1; }
/** * efi_partition(struct parsed_partitions *state, struct block_device *bdev) * @state * @bdev * * Description: called from check.c, if the disk contains GPT * partitions, sets up partition entries in the kernel. * * If the first block on the disk is a legacy MBR, * it will get handled by msdos_partition(). * If it's a Protective MBR, we'll handle it here. * * We do not create a Linux partition for GPT, but * only for the actual data partitions. * Returns: * -1 if unable to read the partition table * 0 if this isn't our partition table * 1 if successful * */ int efi_partition(struct parsed_partitions *state, struct block_device *bdev) { gpt_header *gpt = NULL; gpt_entry *ptes = NULL; u32 i; unsigned ssz = bdev_logical_block_size(bdev) / 512; u8 unparsed_guid[37]; if (!find_valid_gpt(bdev, &gpt, &ptes) || !gpt || !ptes) { kfree(gpt); kfree(ptes); return 0; } pr_debug("GUID Partition Table is valid! Yea!\n"); for (i = 0; i < le32_to_cpu(gpt->num_partition_entries) && i < state->limit-1; i++) { struct partition_meta_info *info; unsigned label_count = 0; unsigned label_max; u64 start = le64_to_cpu(ptes[i].starting_lba); u64 size = le64_to_cpu(ptes[i].ending_lba) - le64_to_cpu(ptes[i].starting_lba) + 1ULL; if (!is_pte_valid(&ptes[i], last_lba(bdev))) continue; put_partition(state, i+1, start * ssz, size * ssz); /* If this is a RAID volume, tell md */ if (!efi_guidcmp(ptes[i].partition_type_guid, PARTITION_LINUX_RAID_GUID)) state->parts[i+1].flags = 1; info = &state->parts[i + 1].info; /* The EFI specification diverges from RFC 4122 with respect to * the packed storage of its UUIDs. efi_guid_unparse unpacks to * a common ASCII representation, which allows part_pack_uuid to * pack it in the standard big endian layout for use by the rest * of the kernel. */ efi_guid_unparse(&ptes[i].unique_partition_guid, unparsed_guid); part_pack_uuid(unparsed_guid, info->uuid); /* Naively convert UTF16-LE to 7 bits. */ label_max = min(sizeof(info->volname) - 1, sizeof(ptes[i].partition_name)); info->volname[label_max] = 0; while (label_count < label_max) { u8 c = ptes[i].partition_name[label_count] & 0xff; if (c && !isprint(c)) c = '!'; info->volname[label_count] = c; label_count++; } state->parts[i + 1].has_info = true; } kfree(ptes); kfree(gpt); printk("\n"); return 1; }