Returned from the OpenProtocol operation, the grub_efi_block_io_media
structure contains the io_align field, specifying the minimum alignment
required for buffers used in any data transfers with the device.

Make grub_efidisk_readwrite() allocate a temporary buffer, aligned to
this boundary, if the buffer passed to it does not already meet the
requirements.

Also sanity check the io_align field in grub_efidisk_open() for
power-of-two-ness and bail if invalid.

Map EFI_NO_MEDIA to GRUB_ERR_OUT_OF_RANGE that is ignored by diskfilter. This
actually matches pretty close (we obviously attempt to read outside of media)
and avoids adding more error codes.

This affects only internally initiated scans. If read/write from removable is
explicitly requested, we still return an error and text explanation is more
clear for user than generic error.

Reported and tested by Andreas Loew <Andreas.Loew@gmx.net>

Found by: Coverity scan.
CID: 96644

	existing code would work even if by some reason bogus definition is
	used by EFI implementations.

	unaligned u16 rather than u8[2].

	variable.

	reading large extents and decrease amount of blocklist hook calls.

	CD-ROM in case when it's declared as having subpartitions.

	Handle CD-ROMs.

Remove no-longer-true __attribute__ ((unused)) on disk parameter.

	It improves performance in qemu.

	sectors.
	Based on patch by Peter Jones.

Also-By: Vladimir Serbinenko <phcoder@gmail.com>

	a FOR_CHILDREN macro.

	memory leak if device name is not found.

* include/grub/arc/arc.h (grub_arc_iterate_devs_hook_t): New type.
(grub_arc_iterate_devs): Add hook_data argument.
* include/grub/ata.h (grub_ata_dev_iterate_hook_t): New type.
(struct grub_ata_dev.iterate): Add hook_data argument.
* include/grub/device.h (grub_device_iterate_hook_t): New type.
(grub_device_iterate): Add hook_data argument.
* include/grub/disk.h (grub_disk_dev_iterate_hook_t): New type.
(struct grub_disk_dev.iterate): Add hook_data argument.
(grub_disk_dev_iterate): Likewise.
* include/grub/gpt_partition.h (grub_gpt_partition_map_iterate):
Likewise.
* include/grub/msdos_partition.h (grub_partition_msdos_iterate):
Likewise.
* include/grub/partition.h (grub_partition_iterate_hook_t): New
type.
(struct grub_partition_map.iterate): Add hook_data argument.
(grub_partition_iterate): Likewise.
* include/grub/scsi.h (grub_scsi_dev_iterate_hook_t): New type.
(struct grub_scsi_dev.iterate): Add hook_data argument.

Update all callers.

	even if it's used.
	(name_devices): Replace #if 0 with #ifdef DEBUG_NAMES.
	Skip if parent is unused.

	out of partitions containing other partitions.

	incorrect devices.

	* grub-core/disk/efi/efidisk.c (get_diskname_from_path_real): New
	function.
	(get_diskname_from_path): Likewise.
	(grub_efidisk_get_device_name): Use get_diskname_from_path instead
	of iterating.

	* grub-core/bus/cs5536.c (grub_cs5536_smbus_wait): Remove unreachable
	code.
	* grub-core/commands/halt.c (grub_cmd_halt): Remove unreachable
	code. Mark as noreturn.
	* grub-core/commands/minicmd.c (grub_mini_cmd_exit): Likewise.
	* grub-core/commands/reboot.c (grub_cmd_reboot): Likewise.
	* grub-core/disk/efi/efidisk.c (grub_efidisk_get_device_name): Remove
	unreachable code.
	* grub-core/kern/main.c (grub_main): Mark as noreturn.
	* grub-core/kern/rescue_reader.c (grub_rescue_run): Likewise.
	* grub-core/lib/posix_wrap/stdlib.h (abort): Likewise.
	* grub-core/normal/menu.c (run_menu): Remove unreachable code.
	* include/grub/kernel.h (grub_main): Mark as noreturn.
	* include/grub/reader.h (grub_rescue_run): Likewise.

	incorrect memory usage.

tpart non-const, so that we can assign to it.  (Since this is a
typedef, the constness refers to the pointer rather than what it
points to.)

	All users updated.
	* disk/loopback.c (grub_loopback): Remove has_partitions.
	All users updated.
	(options): Remove partitions. All users updated.
	* util/grub-fstest.c (fstest): Don't pass "-p" to loopback.
	* util/i386/pc/grub-setup.c (setup): copy partition table only when
	actual partition table is found.