Eric Blake 86a3d5c688 block: Add .bdrv_co_block_status() callback ... We are gradually moving away from sector-based interfaces, towards byte-based. Now that the block layer exposes byte-based allocation, it's time to tackle the drivers. Add a new callback that operates on as small as byte boundaries. Subsequent patches will then update individual drivers, then finally remove .bdrv_co_get_block_status(). The new code also passes through the 'want_zero' hint, which will allow subsequent patches to further optimize callers that only care about how much of the image is allocated (want_zero is false), rather than full details about runs of zeroes and which offsets the allocation actually maps to (want_zero is true). As part of this effort, fix another part of the documentation: the claim in commit 4c41cb4 that BDRV_BLOCK_ALLOCATED is short for 'DATA || ZERO' is a lie at the block layer (see commit e88ae2264), even though it is how the bit is computed from the driver layer. After all, there are intentionally cases where we return ZERO but not ALLOCATED at the block layer, when we know that a read sees zero because the backing file is too short. Note that the driver interface is thus slightly different than the public interface with regards to which bits will be set, and what guarantees are provided on input. We also add an assertion that any driver using the new callback will make progress (the only time pnum will be 0 is if the block layer already handled an out-of-bounds request, or if there is an error); the old driver interface did not provide this guarantee, which could lead to some inf-loops in drastic corner-case failures. Signed-off-by: Eric Blake <eblake@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Reviewed-by: Fam Zheng <famz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>		2018-03-02 18:39:07 +01:00
..
block	block: Add .bdrv_co_block_status() callback	2018-03-02 18:39:07 +01:00
chardev	Move include qemu/option.h from qemu-common.h to actual users	2018-02-09 13:52:16 +01:00
crypto	Include qapi/error.h exactly where needed	2018-02-09 13:50:17 +01:00
disas	target/xtensa: implement disassembler	2018-01-09 09:55:39 -08:00
exec	include/exec/helper-head.h: support f16 in helper calls	2018-03-01 11:13:59 +00:00
fpu	arm/translate-a64: add FP16 FR[ECP/SQRT]S to simd_three_reg_same_fp16	2018-03-01 11:13:59 +00:00
hw	hw/arm/iotkit: Model Arm IOT Kit	2018-03-02 11:03:45 +00:00
io	io: Fix QIOChannelFile when creating and opening read-write	2018-02-15 16:54:57 +00:00
libdecnumber	Clean up ill-advised or unusual header guards	2016-07-12 16:20:46 +02:00
migration	virtio,vhost,pci,pc: features, fixes and cleanups	2018-02-13 16:33:31 +00:00
monitor	Include qapi/qmp/qdict.h exactly where needed	2018-02-09 13:52:15 +01:00
net	net/can: simple messages transport implementation for QEMU	2018-02-13 11:44:13 +01:00
qapi	Move include qemu/option.h from qemu-common.h to actual users	2018-02-09 13:52:16 +01:00
qemu	fpu/softfloat-types: new header to prevent excessive re-builds	2018-02-21 10:20:19 +00:00
qom	Include qapi/qmp/qdict.h exactly where needed	2018-02-09 13:52:15 +01:00
scsi	Include qapi/qmp/qdict.h exactly where needed	2018-02-09 13:52:15 +01:00
standard-headers	virtio-gpu-3d: add support for second capability set (v4)	2018-02-26 13:41:34 +01:00
sysemu	cryptodev-vhost-user: set the key length	2018-03-01 18:26:17 +02:00
ui	console/opengl: split up dpy_gl_cursor ops	2018-02-22 10:35:00 +01:00
elf.h	linux-user: MIPS set cpu to r6 CPU if binary is R6	2018-02-25 17:29:45 +01:00
glib-compat.h	glib-compat: move G_SOURCE_CONTINUE/REMOVE there	2017-10-10 16:33:55 +02:00
qemu-common.h	Move include qemu/option.h from qemu-common.h to actual users	2018-02-09 13:52:16 +01:00
qemu-io.h	hmp: Request permissions in qemu-io	2017-02-28 20:47:50 +01:00
trace-tcg.h	trace: get rid of generated-events.h/generated-events.c	2016-10-12 09:54:52 +02:00