search for: gpt_pt_entry_size

...EFI standard (assuming 512 byte sector size). + * + * In plugins such as the partitioning plugin, if we are requested to + * allocate more than GPT_MIN_PARTITIONS then we increase the + * partition table in chunks of this size. Note that clients may not + * support > GPT_MIN_PARTITIONS. + * + * GPT_PT_ENTRY_SIZE is the minimum specified by the UEFI spec, but + * increasing it is not useful. + */ +#define GPT_MIN_PARTITIONS 128 +#define GPT_PT_ENTRY_SIZE 128 + +#endif /* NBDKIT_GPT_H */ diff --git a/configure.ac b/configure.ac index a0f45e8..bca6134 100644 --- a/configure.ac +++ b/configure.ac @@ -833,6 +83...

...s; + +#define SECTOR_SIZE UINT64_C(512) + +/* Maximum size of MBR disks. This is an approximation based on the + * known limit (2^32 sectors) and an estimate based on the amount of + * padding between partitions. + */ +#define MAX_MBR_DISK_SIZE (UINT32_MAX * SECTOR_SIZE - 5 * ALIGNMENT) + +#define GPT_PT_ENTRY_SIZE 128 + +/* XXX Make these configurable in future? */ +#define ALIGNMENT (2048 * SECTOR_SIZE) +#define PARTITION_ID 0x83 +#define PARTITION_GUID "\xaf\x3d\xc6\x0f\x83\x84\x72\x47\x8e\x79\x3d\x69\xd8\x47\x7d\xe4" + +/* Files supplied on the command line. */ +struct file { + const char *file...

For v3 I reimplemented this using mke2fs -d. This obviously makes the implementation a whole lot simpler, but cannot support multiple directory merging. Patches 1-3 are the same as before. I've also reproduced the notes from v2 below. v2: - Fix inconsistent tab/space. - All 3 plugins now contain a block of text pointing to the other 2 plugins. - TMDIR -> TMPDIR - Unlink the

nbdkit partitioning boot.img swap.img root.img ... creates a virtual disk by adding a partition table. In ancient times Xen used to do this. Rich.

Another interesting thing you can do with this plugin: https://rwmj.wordpress.com/2019/02/19/nbdkit-linuxdisk-plugin/ v2: - Fix inconsistent tab/space. - All 3 plugins now contain a block of text pointing to the other 2 plugins. - TMDIR -> TMPDIR - Unlink the temporary file and other cleanups along error paths. - fclose -> pclose, and check the return value for errors. -

The partitioning plugin patch is the same (except for rebasing). However I have changed the first two patches based on feedback received. In particular this fixes a very serious bug found by Eric Blake in the current truncate filter. Rich.

Turns out Japanese trains are good for coding! In supermin we have a bunch of code to create the libguestfs appliance. It creates it directly using libext2fs (part of e2fsprogs). We can use the same technique to create ext2 virtual disks in nbdkit, which is what this new plugin does. Why a new plugin instead of modifying the floppy plugin? See the 4/4 commit message for an explanation. The

...;last_usable_lba = htole64 (nr_lbas - 34); + if (is_primary) + header->partition_entries_lba = htole64 (2); + else + header->partition_entries_lba = htole64 (nr_lbas - 33); + header->nr_partition_entries = htole32 (GPT_MIN_PARTITIONS); + header->size_partition_entry = htole32 (GPT_PT_ENTRY_SIZE); + header->crc_partitions = + htole32 (efi_crc32 (pt, GPT_PT_ENTRY_SIZE * GPT_MIN_PARTITIONS)); + + /* Must be computed last. */ + header->crc = htole32 (efi_crc32 (header, sizeof *header)); +} + +static void +create_gpt_partition_table_entry (const struct region *region, +...

...;last_usable_lba = htole64 (nr_lbas - 34); + if (is_primary) + header->partition_entries_lba = htole64 (2); + else + header->partition_entries_lba = htole64 (nr_lbas - 33); + header->nr_partition_entries = htole32 (GPT_MIN_PARTITIONS); + header->size_partition_entry = htole32 (GPT_PT_ENTRY_SIZE); + header->crc_partitions = + htole32 (efi_crc32 (pt, GPT_PT_ENTRY_SIZE * GPT_MIN_PARTITIONS)); + + /* Must be computed last. */ + header->crc = htole32 (efi_crc32 (header, sizeof *header)); +} + +static void +create_gpt_partition_table_entry (const struct region *region, +...