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qemu/block
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Eric Blake 081dd1fe36 nbd: Implement NBD_INFO_BLOCK_SIZE on client 
The upstream NBD Protocol has defined a new extension to allow
the server to advertise block sizes to the client, as well as
a way for the client to inform the server whether it intends to
obey block sizes.

When using the block layer as the client, we will obey block
sizes; but when used as 'qemu-nbd -c' to hand off to the
kernel nbd module as the client, we are still waiting for the
kernel to implement a way for us to learn if it will honor
block sizes (perhaps by an addition to sysfs, rather than an
ioctl), as well as any way to tell the kernel what additional
block sizes to obey (NBD_SET_BLKSIZE appears to be accurate
for the minimum size, but preferred and maximum sizes would
probably be new ioctl()s), so until then, we need to make our
request for block sizes conditional.

When using ioctl(NBD_SET_BLKSIZE) to hand off to the kernel,
use the minimum block size as the sector size if it is larger
than 512, which also has the nice effect of cooperating with
(non-qemu) servers that don't do read-modify-write when
exposing a block device with 4k sectors; it might also allow
us to visit a file larger than 2T on a 32-bit kernel.

Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <20170707203049.534-10-eblake@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-07-14 12:04:42 +02:00
..
accounting.c block: make accounting thread-safe 2017-06-16 07:55:00 +08:00
backup.c block: Make bdrv_is_allocated() byte-based 2017-07-10 13:18:07 +02:00
blkdebug.c block: Add PreallocMode to bdrv_truncate() 2017-07-11 17:45:01 +02:00
blkreplay.c block: change variable names in BlockDriverState 2017-06-26 14:54:46 +02:00
blkverify.c blkverify: Catch bs->exact_filename overflow 2017-06-26 14:54:46 +02:00
block-backend.c block: Add PreallocMode to blk_truncate() 2017-07-11 17:45:01 +02:00
bochs.c block: do not set BDS read_only if copy_on_read enabled 2017-04-24 15:09:33 -04:00
cloop.c block: do not set BDS read_only if copy_on_read enabled 2017-04-24 15:09:33 -04:00
commit.c block: Add PreallocMode to blk_truncate() 2017-07-11 17:45:01 +02:00
crypto.c block: Add PreallocMode to bdrv_truncate() 2017-07-11 17:45:01 +02:00
crypto.h qcow: convert QCow to use QCryptoBlock for encryption 2017-07-11 17:44:56 +02:00
curl.c curl: do not do aio_poll when waiting for a free CURLState 2017-05-16 10:34:50 -04:00
dirty-bitmap.c block: release persistent bitmaps on inactivate 2017-07-11 17:44:59 +02:00
dmg-bz2.c dmg: Move libbz2 code to dmg-bz2.so 2016-10-07 14:14:06 +02:00
dmg.c block: do not set BDS read_only if copy_on_read enabled 2017-04-24 15:09:33 -04:00
dmg.h dmg: Move libbz2 code to dmg-bz2.so 2016-10-07 14:14:06 +02:00
file-posix.c block/file-posix: Preallocation for truncate 2017-07-11 17:45:01 +02:00
file-win32.c block: Add PreallocMode to BD.bdrv_truncate() 2017-07-11 17:45:01 +02:00
gluster.c block: Add PreallocMode to BD.bdrv_truncate() 2017-07-11 17:45:01 +02:00
io.c block/dirty-bitmap: add readonly field to BdrvDirtyBitmap 2017-07-11 17:44:58 +02:00
iscsi-opts.c block/iscsi: statically link qemu_iscsi_opts 2017-01-27 18:07:58 +01:00
iscsi.c block: Add PreallocMode to BD.bdrv_truncate() 2017-07-11 17:45:01 +02:00
linux-aio.c block: explicitly acquire aiocontext in aio callbacks that need it 2017-02-21 11:39:39 +00:00
Makefile.objs qcow2: add bitmaps extension 2017-07-11 17:44:57 +02:00
mirror.c block: Add PreallocMode to blk_truncate() 2017-07-11 17:45:01 +02:00
nbd-client.c nbd: Implement NBD_INFO_BLOCK_SIZE on client 2017-07-14 12:04:42 +02:00
nbd-client.h nbd: Create struct for tracking export info 2017-07-14 12:04:41 +02:00
nbd.c nbd: Implement NBD_INFO_BLOCK_SIZE on client 2017-07-14 12:04:42 +02:00
nfs.c block: Add PreallocMode to BD.bdrv_truncate() 2017-07-11 17:45:01 +02:00
null.c qobject: Use simpler QDict/QList scalar insertion macros 2017-05-09 09:13:51 +02:00
parallels.c block: Add PreallocMode to blk_truncate() 2017-07-11 17:45:01 +02:00
qapi.c block: remove all encryption handling APIs 2017-07-11 17:44:56 +02:00
qcow2-bitmap.c qcow2: add .bdrv_remove_persistent_dirty_bitmap 2017-07-11 17:44:59 +02:00
qcow2-cache.c qcow2: Remove stale comment 2016-11-25 13:51:30 +01:00
qcow2-cluster.c qcow2: add support for LUKS encryption format 2017-07-11 17:44:56 +02:00
qcow2-refcount.c block/qcow2: falloc/full preallocating growth 2017-07-11 17:45:02 +02:00
qcow2-snapshot.c qcow2: Discard/zero clusters by byte count 2017-05-11 14:28:07 +02:00
qcow2.c block/qcow2: falloc/full preallocating growth 2017-07-11 17:45:02 +02:00
qcow2.h block/qcow2: falloc/full preallocating growth 2017-07-11 17:45:02 +02:00
qcow.c block: Add PreallocMode to blk_truncate() 2017-07-11 17:45:01 +02:00
qed-check.c
qed-cluster.c qed: Add coroutine_fn to I/O path functions 2017-06-26 14:51:15 +02:00
qed-l2-cache.c
qed-table.c qed: Remove callback from qed_write_table() 2017-06-26 14:51:14 +02:00
qed.c block: Add PreallocMode to blk_truncate() 2017-07-11 17:45:01 +02:00
qed.h qed: Add coroutine_fn to I/O path functions 2017-06-26 14:51:15 +02:00
quorum.c qapi: merge QInt and QFloat in QNum 2017-06-20 14:31:31 +02:00
raw-format.c block: Add PreallocMode to bdrv_truncate() 2017-07-11 17:45:01 +02:00
rbd.c block: Add PreallocMode to BD.bdrv_truncate() 2017-07-11 17:45:01 +02:00
replication.c block: Make bdrv_is_allocated_above() byte-based 2017-07-10 13:18:07 +02:00
sheepdog.c block: Add PreallocMode to BD.bdrv_truncate() 2017-07-11 17:45:01 +02:00
snapshot.c qobject: Use simpler QDict/QList scalar insertion macros 2017-05-09 09:13:51 +02:00
ssh.c block: Do not strcmp() with NULL uri->scheme 2017-06-26 14:54:46 +02:00
stream.c block: Make bdrv_is_allocated_above() byte-based 2017-07-10 13:18:07 +02:00
throttle-groups.c throttle: Update throttle-groups.c documentation 2017-06-26 14:51:13 +02:00
trace-events trace: Show blockjob actions via bytes, not sectors 2017-07-10 13:18:06 +02:00
vdi.c block: Add PreallocMode to blk_truncate() 2017-07-11 17:45:01 +02:00
vhdx-endian.c vhdx: Use QEMU UUID API 2016-09-23 11:42:52 +08:00
vhdx-log.c block: Add PreallocMode to bdrv_truncate() 2017-07-11 17:45:01 +02:00
vhdx.c block: Add PreallocMode to blk_truncate() 2017-07-11 17:45:01 +02:00
vhdx.h
vmdk.c block: Add PreallocMode to blk_truncate() 2017-07-11 17:45:01 +02:00
vpc.c block: Add PreallocMode to blk_truncate() 2017-07-11 17:45:01 +02:00
vvfat.c block: Make bdrv_is_allocated() byte-based 2017-07-10 13:18:07 +02:00
vxhs.c qobject: Use simpler QDict/QList scalar insertion macros 2017-05-09 09:13:51 +02:00
win32-aio.c block: explicitly acquire aiocontext in aio callbacks that need it 2017-02-21 11:39:39 +00:00
write-threshold.c block: use bdrv_add_before_write_notifier 2016-10-07 13:34:07 +02:00