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home:Alexander_Naumov:SLE12
parted
parted-gpt-mbr-sync.patch
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File parted-gpt-mbr-sync.patch of Package parted
--- libparted/labels/gpt.c | 240 ++++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 236 insertions(+), 4 deletions(-) Index: parted-3.1/libparted/labels/gpt.c =================================================================== --- parted-3.1.orig/libparted/labels/gpt.c +++ parted-3.1/libparted/labels/gpt.c @@ -286,6 +286,7 @@ typedef struct _GPTPartitionData } GPTPartitionData; static PedDiskType gpt_disk_type; +static PedDiskType gpt_sync_mbr_disk_type; static inline uint32_t pth_get_size (const PedDevice *dev) @@ -454,8 +455,50 @@ _pmbr_is_valid (const LegacyMBR_t *mbr) return 0; } +/* checks if device has a hybrid protective MBR partition table + * + * If the 1st partition has type 0xEE that spans the entire + * size of the disk from sector 1 to the last sector + * (or 2 TiB, whichever is smaller), we consider it 'normal' GPT. + * Otherwise it is synced GPT with hybridized pMBR. + */ +static inline int +_has_hybrid_pmbr (const PedDevice *dev) +{ + int has_hybrid_pmbr = 1; + + PED_ASSERT (dev != NULL); + + void *label; + if (!ptt_read_sector (dev, 0, &label)) + return 0; + + LegacyMBR_t mbr; + memcpy(&mbr, label, sizeof(mbr)); + + if (mbr.Signature != PED_CPU_TO_LE16 (MSDOS_MBR_SIGNATURE)) { + free(label); + return 0; + } + + uint32_t efi_gpt_expected_size; + if ((dev->length - 1ULL) > 0xFFFFFFFFULL) + efi_gpt_expected_size = 0xFFFFFFFF; + else + efi_gpt_expected_size = dev->length - 1UL; + + if ((mbr.PartitionRecord[0].OSType == EFI_PMBR_OSTYPE_EFI) && + (mbr.PartitionRecord[0].StartingLBA == PED_CPU_TO_LE32(1)) && + (mbr.PartitionRecord[0].SizeInLBA == PED_CPU_TO_LE32(efi_gpt_expected_size))) + /* pMBR is not hybrid */ + has_hybrid_pmbr = 0; + + free(label); + return has_hybrid_pmbr; +} + static int -gpt_probe (const PedDevice *dev) +_gpt_probe_generic(const PedDevice *dev) { GuidPartitionTableHeader_t *gpt = NULL; int gpt_sig_found = 0; @@ -508,6 +551,19 @@ gpt_probe (const PedDevice *dev) return ok; } +static int +gpt_probe (const PedDevice *dev) +{ + return _gpt_probe_generic(dev) && !_has_hybrid_pmbr(dev); +} + + +static int +gpt_sync_mbr_probe (const PedDevice *dev) +{ + return _gpt_probe_generic(dev) && _has_hybrid_pmbr(dev); +} + static PedDisk * gpt_alloc (const PedDevice *dev) { @@ -546,6 +602,36 @@ error: } static PedDisk * +gpt_sync_mbr_alloc (const PedDevice *dev) +{ + PedDisk *disk; + GPTDiskData *gpt_disk_data; + PedSector data_start, data_end; + + disk = _ped_disk_alloc ((PedDevice *) dev, &gpt_sync_mbr_disk_type); + if (!disk) + goto error; + disk->disk_specific = gpt_disk_data = ped_malloc (sizeof (GPTDiskData)); + if (!disk->disk_specific) + goto error_free_disk; + + data_start = 2 + GPT_DEFAULT_PARTITION_ENTRY_ARRAY_SIZE / dev->sector_size; + data_end = dev->length - 2 + - GPT_DEFAULT_PARTITION_ENTRY_ARRAY_SIZE / dev->sector_size; + ped_geometry_init (&gpt_disk_data->data_area, dev, data_start, + data_end - data_start + 1); + gpt_disk_data->entry_count = GPT_DEFAULT_PARTITION_ENTRIES; + uuid_generate ((unsigned char *) &gpt_disk_data->uuid); + swap_uuid_and_efi_guid ((unsigned char *) (&gpt_disk_data->uuid)); + return disk; + +error_free_disk: + free (disk); +error: + return NULL; +} + +static PedDisk * gpt_duplicate (const PedDisk *disk) { PedDisk *new_disk; @@ -930,7 +1016,7 @@ gpt_read (PedDisk *disk) /* motivation: let the user decide about the pmbr... during ped_disk_probe(), they probably didn't get a choice... */ - if (!gpt_probe (disk->dev)) + if (!gpt_probe (disk->dev) && !gpt_sync_mbr_probe(disk->dev)) goto error; GuidPartitionTableHeader_t *gpt = NULL; @@ -1087,11 +1173,59 @@ error: return 0; } + +static inline unsigned char +_part_to_ostype (PedPartition* part) +{ + if (part->fs_type) { + if (strncmp (part->fs_type->name, "fat", 3) == 0) return 0xc; + if (strncmp (part->fs_type->name, "ntfs", 4) == 0) return 0x7; + if (strncmp (part->fs_type->name, "hfs", 3) == 0) return 0xaf; + if (strstr (part->fs_type->name, "swap")) return 0x82; + } + return 0x83; // Everything else is Linux +} + +static inline PedPartition* +_find_first_part (const PedDisk* disk) +{ + PedPartition *retval = NULL, *part = NULL; + uint64_t lowest_end = 0xffffffffffffffff; + while (part = ped_disk_next_partition (disk, part)) { + if (part->geom.start == 0 || part->type == PED_PARTITION_METADATA + || part->type == PED_PARTITION_FREESPACE) + continue; + if (part->geom.end < lowest_end) { + retval = part; + lowest_end = part->geom.end; + } + } + return retval; +} + +static inline uint32_t +_part_32bitmax (uint64_t in) +{ + if (in > 0xFFFFFFFFULL) + return 0xFFFFFFFF; + else + return (uint32_t)in; +} + + #ifndef DISCOVER_ONLY /* Write the protective MBR (to keep DOS happy) */ static int -_write_pmbr (PedDevice *dev, bool pmbr_boot) +_write_pmbr (const PedDisk *disk, bool pmbr_boot) { + PedDevice * dev = disk->dev; + + /* need sync GPT -> hybrid pMBR ? */ + int sync_pmbr = !strcmp(disk->type->name, "gpt_sync_mbr") ? 1 : 0; + + int i, pmbr_id, first_entry = 0, last_entry = 3; + PedPartition *part = NULL, *esp; + /* The UEFI spec is not clear about what to do with the following elements of the Protective MBR (pmbr): BootCode (0-440B), UniqueMBRSignature (440B-444B) and Unknown (444B-446B). @@ -1105,6 +1239,8 @@ _write_pmbr (PedDevice *dev, bool pmbr_b memset (pmbr->PartitionRecord, 0, sizeof pmbr->PartitionRecord); pmbr->Signature = PED_CPU_TO_LE16 (MSDOS_MBR_SIGNATURE); + + if (!sync_pmbr) { pmbr->PartitionRecord[0].OSType = EFI_PMBR_OSTYPE_EFI; pmbr->PartitionRecord[0].StartSector = 1; pmbr->PartitionRecord[0].EndHead = 0xFE; @@ -1117,6 +1253,60 @@ _write_pmbr (PedDevice *dev, bool pmbr_b pmbr->PartitionRecord[0].SizeInLBA = PED_CPU_TO_LE32 (dev->length - 1UL); if (pmbr_boot) pmbr->PartitionRecord[0].BootIndicator = 0x80; + } else { + /* Search for an EFI System Partition */ + esp = _find_first_part(disk); + if (!esp || !esp->fs_type || strncmp (esp->fs_type->name, "fat", 3) != 0) + esp = NULL; + + pmbr_id = 3; + if (esp) { + pmbr_id = 0; + first_entry = 1; + last_entry = 4; + } + + /* Write a pseudo-PMBR so Linux is happy */ + pmbr->PartitionRecord[pmbr_id].OSType = EFI_PMBR_OSTYPE_EFI; + pmbr->PartitionRecord[pmbr_id].StartSector = 1; + pmbr->PartitionRecord[pmbr_id].EndHead = 0xFE; + pmbr->PartitionRecord[pmbr_id].EndSector = 0xFF; + pmbr->PartitionRecord[pmbr_id].EndTrack = 0xFF; + pmbr->PartitionRecord[pmbr_id].StartingLBA = PED_CPU_TO_LE32(1); + pmbr->PartitionRecord[pmbr_id].SizeInLBA = PED_CPU_TO_LE32 (1); + if (esp) + pmbr->PartitionRecord[pmbr_id].SizeInLBA = PED_CPU_TO_LE32 (esp->geom.end - 1); + + /* sync the first 3 GPT entries to MBR primary partitions */ + for (i=first_entry; i < last_entry; i++) { + part = ped_disk_next_partition (disk, part); + if (part == NULL) + break; + /* we might get a starting garbage partition */ + if (part->geom.start == 0 || part->type == PED_PARTITION_METADATA || part->type == PED_PARTITION_FREESPACE || part == esp) { + i--; + continue; + } + + /* partition can not be represented by dos label - don't sync it */ + if (part->geom.start > 0xFFFFFFFF || + (part->geom.end - part->geom.start + 1) > 0xFFFFFFFF) { + continue; + } + + pmbr->PartitionRecord[i].OSType = _part_to_ostype(part); + pmbr->PartitionRecord[i].StartHead = 0xFE; + pmbr->PartitionRecord[i].StartSector = 0xFF; + pmbr->PartitionRecord[i].StartTrack = 0xFF; + pmbr->PartitionRecord[i].EndHead = 0xFE; + pmbr->PartitionRecord[i].EndSector = 0xFF; + pmbr->PartitionRecord[i].EndTrack = 0xFF; + pmbr->PartitionRecord[i].StartingLBA = PED_CPU_TO_LE32 (_part_32bitmax(part->geom.start)); + if(((GPTPartitionData*)part->disk_specific)->boot) + pmbr->PartitionRecord[i].BootIndicator = 0x80; + pmbr->PartitionRecord[i].SizeInLBA = PED_CPU_TO_LE32 (_part_32bitmax(part->geom.end - part->geom.start + 1)); + } + } int write_ok = ped_device_write (dev, pmbr, GPT_PMBR_LBA, GPT_PMBR_SECTORS); @@ -1237,7 +1427,7 @@ gpt_write (const PedDisk *disk) ptes_crc = efi_crc32 (ptes, ptes_bytes); /* Write protective MBR */ - if (!_write_pmbr (disk->dev, gpt_disk_data->pmbr_boot)) + if (!_write_pmbr (disk, gpt_disk_data->pmbr_boot)) goto error_free_ptes; /* Write PTH and PTEs */ @@ -1857,6 +2047,38 @@ static PedDiskOps gpt_disk_ops = PT_op_function_initializers (gpt) }; +static PedDiskOps gpt_sync_mbr_disk_ops = +{ + clobber: NULL, + write: NULL_IF_DISCOVER_ONLY (gpt_write), + + partition_set_name: gpt_partition_set_name, + partition_get_name: gpt_partition_get_name, + + /* probe function redefined */ + probe: gpt_sync_mbr_probe, + /* alloc function redefined */ + alloc: gpt_sync_mbr_alloc, + duplicate: gpt_duplicate, + free: gpt_free, + read: gpt_read, + partition_new: gpt_partition_new, + partition_duplicate: gpt_partition_duplicate, + partition_set_flag: gpt_partition_set_flag, + partition_get_flag: gpt_partition_get_flag, + partition_set_system: gpt_partition_set_system, + partition_is_flag_available: gpt_partition_is_flag_available, + partition_align: gpt_partition_align, + partition_destroy: gpt_partition_destroy, + partition_enumerate: gpt_partition_enumerate, + alloc_metadata: gpt_alloc_metadata, + get_max_primary_partition_count: gpt_get_max_primary_partition_count, + get_max_supported_partition_count: gpt_get_max_supported_partition_count, + partition_check: gpt_partition_check, + max_length: gpt_partition_max_length, + max_start_sector: gpt_partition_max_start_sector +}; + static PedDiskType gpt_disk_type = { next: NULL, @@ -1865,16 +2087,26 @@ static PedDiskType gpt_disk_type = features: PED_DISK_TYPE_PARTITION_NAME }; +static PedDiskType gpt_sync_mbr_disk_type = +{ + next: NULL, + name: "gpt_sync_mbr", + ops: &gpt_sync_mbr_disk_ops, + features: PED_DISK_TYPE_PARTITION_NAME +}; + void ped_disk_gpt_init () { ped_disk_type_register (&gpt_disk_type); + ped_disk_type_register (&gpt_sync_mbr_disk_type); } void ped_disk_gpt_done () { ped_disk_type_unregister (&gpt_disk_type); + ped_disk_type_unregister (&gpt_sync_mbr_disk_type); } verify (sizeof (GuidPartitionEntryAttributes_t) == 8);
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