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Stefan Reiter 3f934817c8 block/io: accept NULL qiov in bdrv_pad_request 
Some operations, e.g. block-stream, perform reads while discarding the
results (only copy-on-read matters). In this case, they will pass NULL
as the target QEMUIOVector, which will however trip bdrv_pad_request,
since it wants to extend its passed vector. In particular, this is the
case for the blk_co_preadv() call in stream_populate().

If there is no qiov, no operation can be done with it, but the bytes
and offset still need to be updated, so the subsequent aligned read
will actually be aligned and not run into an assertion failure.

In particular, this can happen when the request alignment of the top
node is larger than the allocated part of the bottom node, in which
case padding becomes necessary. For example:

> ./qemu-img create /tmp/backing.qcow2 -f qcow2 64M -o cluster_size=32768
> ./qemu-io -c "write -P42 0x0 0x1" /tmp/backing.qcow2
> ./qemu-img create /tmp/top.qcow2 -f qcow2 64M -b /tmp/backing.qcow2 -F qcow2
> ./qemu-system-x86_64 --qmp stdio \
> --blockdev qcow2,node-name=node0,file.driver=file,file.filename=/tmp/top.qcow2 \
> <<EOF
> {"execute": "qmp_capabilities"}
> {"execute": "blockdev-add", "arguments": { "driver": "compress", "file": "node0", "node-name": "node1" } }
> {"execute": "block-stream", "arguments": { "job-id": "stream0", "device": "node1" } }
> EOF

Originally-by: Stefan Reiter <s.reiter@proxmox.com>
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
[FE: do update bytes and offset in any case
     add reproducer to commit message]
Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
Message-ID: <20240322095009.346989-2-f.ebner@proxmox.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
 		2024-03-26 14:21:26 +01:00
..
export block: remove outdated AioContext locking comments 2023-12-21 22:49:27 +01:00
monitor stream: Allow users to request only format driver names in backing file format 2024-01-26 11:16:58 +01:00
accounting.c block: add missed block_acct_setup with new block device init procedure 2022-09-30 18:42:34 +02:00
aio_task.c block/aio_task: assert `max_busy_tasks` is greater than 0 2021-10-05 18:56:41 +02:00
amend.c block: Mark BlockDriver callbacks for amend job GRAPH_RDLOCK 2023-05-10 14:16:54 +02:00
backup.c graph-lock: remove AioContext locking 2023-12-21 22:49:27 +01:00
blkdebug.c block: Take graph lock for most of .bdrv_open 2023-11-08 17:56:18 +01:00
blkio.c blkio: Respect memory-alignment for bounce buffer allocations 2024-02-07 15:26:04 +01:00
blklogwrites.c block/blklogwrites: Protect mutable driver state with a mutex. 2024-01-26 11:16:58 +01:00
blkreplay.c block: Protect bs->file with graph_lock 2023-11-08 17:56:18 +01:00
blkverify.c graph-lock: remove AioContext locking 2023-12-21 22:49:27 +01:00
block-backend.c block-backend: Allow concurrent context changes 2024-02-07 14:55:25 +01:00
block-copy.c block: Mark bdrv_chain_contains() and callers GRAPH_RDLOCK 2023-11-07 19:14:19 +01:00
block-gen.h block-coroutine-wrapper.py: support also basic return types 2022-12-15 16:07:43 +01:00
block-ram-registrar.c block: add BlockRAMRegistrar 2022-10-26 14:56:42 -04:00
bochs.c block: Take graph lock for most of .bdrv_open 2023-11-08 17:56:18 +01:00
cloop.c block: Take graph lock for most of .bdrv_open 2023-11-08 17:56:18 +01:00
commit.c commit: Allow users to request only format driver names in backing file format 2024-01-26 11:16:58 +01:00
copy-before-write.c block/copy-before-write: Fix missing ERRP_GUARD() for error_prepend() 2024-03-12 11:45:33 +01:00
copy-before-write.h block/copy-before-write.h: global state API + assertions 2022-03-04 18:18:25 +01:00
copy-on-read.c block: Take graph lock for most of .bdrv_open 2023-11-08 17:56:18 +01:00
copy-on-read.h block: Mark bdrv_(un)freeze_backing_chain() and callers GRAPH_RDLOCK 2023-11-07 19:14:19 +01:00
coroutines.h nbd: Mark nbd_co_do_establish_connection() and callers GRAPH_RDLOCK 2023-05-10 14:16:53 +02:00
create.c block: Call .bdrv_co_create(_opts) unlocked 2023-05-19 19:12:12 +02:00
crypto.c block: Support detached LUKS header creation using qemu-img 2024-02-09 12:50:37 +00:00
crypto.h block: Support detached LUKS header creation using qemu-img 2024-02-09 12:50:37 +00:00
curl.c block: Mark bdrv_apply_auto_read_only() and callers GRAPH_RDLOCK 2023-10-12 16:31:33 +02:00
dirty-bitmap.c block: Mark bdrv_*_dirty_bitmap() and callers GRAPH_RDLOCK 2023-02-23 19:49:32 +01:00
dmg-bz2.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
dmg-lzfse.c block/dmg: Ignore C99 prototype declaration mismatch from <lzfse.h> 2023-03-30 15:03:36 +02:00
dmg.c block: Protect bs->file with graph_lock 2023-11-08 17:56:18 +01:00
dmg.h block/dmg: Declare a type definition for DMG uncompress function 2023-04-24 13:53:44 -04:00
file-posix.c block/file-posix: set up Linux AIO and io_uring in the current thread 2023-12-21 22:49:27 +01:00
file-win32.c thread-pool: avoid passing the pool parameter every time 2023-04-25 13:17:28 +02:00
filter-compress.c block: Take graph lock for most of .bdrv_open 2023-11-08 17:56:18 +01:00
gluster.c block: Mark bdrv_apply_auto_read_only() and callers GRAPH_RDLOCK 2023-10-12 16:31:33 +02:00
graph-lock.c graph-lock: remove AioContext locking 2023-12-21 22:49:27 +01:00
io.c block/io: accept NULL qiov in bdrv_pad_request 2024-03-26 14:21:26 +01:00
io_uring.c block/io_uring: improve error message when init fails 2024-01-30 16:13:28 -05:00
iscsi-opts.c modules: add block module annotations 2021-07-09 18:20:27 +02:00
iscsi.c block: Mark bdrv_apply_auto_read_only() and callers GRAPH_RDLOCK 2023-10-12 16:31:33 +02:00
linux-aio.c virtio: use defer_call() in virtio_irqfd_notify() 2023-10-31 15:42:14 +01:00
meson.build configure, meson: rename targetos to host_os 2023-12-31 09:11:29 +01:00
mirror.c mirror: Don't call job_pause_point() under graph lock 2024-03-18 12:03:04 +01:00
nbd.c block/nbd: Fix missing ERRP_GUARD() for error_prepend() 2024-03-12 11:45:33 +01:00
nfs.c block: Mark bdrv_refresh_filename() and callers GRAPH_RDLOCK 2023-10-12 16:31:33 +02:00
null.c block: Convert bdrv_get_allocated_file_size() to co_wrapper 2023-02-01 16:52:32 +01:00
nvme.c block/nvme: Fix missing ERRP_GUARD() for error_prepend() 2024-03-12 11:45:33 +01:00
parallels-ext.c block: Protect bs->file with graph_lock 2023-11-08 17:56:18 +01:00
parallels.c block: Protect bs->file with graph_lock 2023-11-08 17:56:18 +01:00
parallels.h block: Protect bs->file with graph_lock 2023-11-08 17:56:18 +01:00
preallocate.c block: Protect bs->file with graph_lock 2023-11-08 17:56:18 +01:00
progress_meter.c coroutine: Clean up superfluous inclusion of qemu/lockable.h 2023-01-19 10:18:28 +01:00
qapi-sysemu.c block: remove AioContext locking 2023-12-21 22:49:27 +01:00
qapi.c qemu-img: Fix Column Width and Improve Formatting in snapshot list 2024-03-18 13:30:34 +01:00
qcow.c crypto: Modify the qcrypto_block_create to support creation flags 2024-02-09 12:50:37 +00:00
qcow2-bitmap.c block/qcow2-bitmap: Fix missing ERRP_GUARD() for error_prepend() 2024-03-12 11:45:33 +01:00
qcow2-cache.c qcow2: Mark qcow2_signal_corruption() and callers GRAPH_RDLOCK 2023-10-12 16:31:33 +02:00
qcow2-cluster.c qcow2: Take locks for accessing bs->file 2023-11-08 17:56:17 +01:00
qcow2-refcount.c qcow2: Mark qcow2_signal_corruption() and callers GRAPH_RDLOCK 2023-10-12 16:31:33 +02:00
qcow2-snapshot.c qcow2: mark various functions as coroutine_fn and GRAPH_RDLOCK 2023-04-25 13:17:28 +02:00
qcow2-threads.c thread-pool: avoid passing the pool parameter every time 2023-04-25 13:17:28 +02:00
qcow2.c block/qcow2: Fix missing ERRP_GUARD() for error_prepend() 2024-03-12 11:45:33 +01:00
qcow2.h qcow2: Take locks for accessing bs->file 2023-11-08 17:56:17 +01:00
qed-check.c qed: mark more functions as coroutine_fns and GRAPH_RDLOCK 2023-06-28 09:46:20 +02:00
qed-cluster.c qed: protect table cache with CoMutex 2017-07-17 11:34:11 +08:00
qed-l2-cache.c osdep: Move memalign-related functions to their own header 2022-03-07 13:16:49 +00:00
qed-table.c block: use bdrv_co_debug_event in coroutine context 2023-06-28 09:46:34 +02:00
qed.c block/qed: Fix missing ERRP_GUARD() for error_prepend() 2024-03-12 11:45:33 +01:00
qed.h block: Protect bs->file with graph_lock 2023-11-08 17:56:18 +01:00
quorum.c graph-lock: remove AioContext locking 2023-12-21 22:49:27 +01:00
raw-format.c block: remove AioContext locking 2023-12-21 22:49:27 +01:00
rbd.c block: Mark bdrv_apply_auto_read_only() and callers GRAPH_RDLOCK 2023-10-12 16:31:33 +02:00
replication.c block: remove AioContext locking 2023-12-21 22:49:27 +01:00
reqlist.c block/reqlist: add reqlist_wait_all() 2022-03-07 09:33:30 +01:00
snapshot-access.c block: Take graph lock for most of .bdrv_open 2023-11-08 17:56:18 +01:00
snapshot.c block/snapshot: Fix missing ERRP_GUARD() for error_prepend() 2024-03-12 11:45:34 +01:00
ssh.c aio: remove aio_disable_external() API 2023-05-30 17:37:26 +02:00
stream.c stream: Allow users to request only format driver names in backing file format 2024-01-26 11:16:58 +01:00
throttle-groups.c block: mark mixed functions that can suspend 2023-09-26 18:09:08 +02:00
throttle.c block: Take graph lock for most of .bdrv_open 2023-11-08 17:56:18 +01:00
trace-events nbd/client: Accept 64-bit block status chunks 2023-10-05 11:02:08 -05:00
trace.h trace: switch position of headers to what Meson requires 2020-08-21 06:18:24 -04:00
vdi.c block/vdi: Fix missing ERRP_GUARD() for error_prepend() 2024-03-12 11:45:34 +01:00
vhdx-endian.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
vhdx-log.c vhdx: Take locks for accessing bs->file 2023-11-08 17:56:18 +01:00
vhdx.c vhdx: Take locks for accessing bs->file 2023-11-08 17:56:18 +01:00
vhdx.h vhdx: Take locks for accessing bs->file 2023-11-08 17:56:18 +01:00
vmdk.c block/vmdk: Fix missing ERRP_GUARD() for error_prepend() 2024-03-12 11:45:34 +01:00
vpc.c block: Take graph lock for most of .bdrv_open 2023-11-08 17:56:18 +01:00
vvfat.c cpr: relax blockdev migration blockers 2023-11-01 16:13:59 +01:00
win32-aio.c aio: remove aio_disable_external() API 2023-05-30 17:37:26 +02:00
write-threshold.c block: remove AioContext locking 2023-12-21 22:49:27 +01:00