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Kevin Wolf 2c3165a1a6 file-posix: Handle suspended dm-multipath better for SG_IO 
When introducing DM_MPATH_PROBE_PATHS, we already anticipated that
dm-multipath devices might be suspended for a short time when the DM
tables are reloaded and that they return -EAGAIN in this case. We then
wait for a millisecond and retry.

However, meanwhile it has also turned out that libmpathpersist (which is
used by qemu-pr-helper) may need to perform more complex recovery
operations to get reservations back to expected state if a path failure
happened in the middle of a PR operation. In this case, the device is
suspended for a longer time compared to the case we originally expected.

This patch changes hdev_co_ioctl() to treat -EAGAIN separately so that
it doesn't result in an immediate failure if the device is suspended for
more than 1ms, and moves to incremental backoff to cover both quick and
slow cases without excessive delays.

Buglink: https://issues.redhat.com/browse/RHEL-121543
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-ID: <20251128221440.89125-1-kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2025-12-04 18:34:15 +01:00
..
export block/export: Add option to allow export of inactive nodes 2025-02-06 14:46:40 +01:00
monitor block/monitor: Use hmp_handle_error to report error 2025-10-29 12:10:09 +01:00
accounting.c block: enable stats-intervals for storage devices 2025-10-29 12:10:09 +01:00
aio_task.c block: Remove unused aio_task_pool_empty 2024-09-30 10:53:18 +03:00
amend.c block: Mark BlockDriver callbacks for amend job GRAPH_RDLOCK 2023-05-10 14:16:54 +02:00
backup.c block: add bdrv_graph_wrlock_drained() convenience wrapper 2025-07-14 15:40:58 +02:00
blkdebug.c block: Expand block status mode from bool to flags 2025-05-14 15:33:34 -05:00
blkio.c include/system: Move exec/memory.h to system/memory.h 2025-04-23 14:08:21 -07:00
blklogwrites.c block: add bdrv_graph_wrlock_drained() convenience wrapper 2025-07-14 15:40:58 +02:00
blkreplay.c blkreplay: Run BH in coroutine’s AioContext 2025-11-18 18:01:55 +01:00
blkverify.c block: add bdrv_graph_wrlock_drained() convenience wrapper 2025-07-14 15:40:58 +02:00
block-backend.c block: use pwrite_zeroes_alignment when writing first sector 2025-11-25 15:26:22 +01:00
block-copy.c include: Rename sysemu/ -> system/ 2024-12-20 17:44:56 +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 include: Rename sysemu/ -> system/ 2024-12-20 17:44:56 +01:00
bochs.c block: replace TABs with space 2025-11-11 22:06:09 +01:00
cloop.c block: Take graph lock for most of .bdrv_open 2023-11-08 17:56:18 +01:00
commit.c block/commit: mark commit_abort() as GRAPH_UNLOCKED 2025-07-14 15:42:13 +02:00
copy-before-write.c block: Expand block status mode from bool to flags 2025-05-14 15:33:34 -05:00
copy-before-write.h blockdev-backup: Add error handling option for copy-before-write jobs 2025-05-12 18:19:31 +03:00
copy-on-read.c qapi: Move include/qapi/qmp/ to include/qobject/ 2025-02-10 15:33:16 +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 block: Expand block status mode from bool to flags 2025-05-14 15:33:34 -05:00
create.c qemu/compiler: Absorb 'clang-tsa.h' 2025-03-06 14:21:25 +01:00
crypto.c block: Allow drivers to control protocol prefix at creation 2025-11-11 22:06:09 +01:00
crypto.h block: Support detached LUKS header creation using qemu-img 2024-02-09 12:50:37 +00:00
curl.c curl: Fix coroutine waking 2025-11-18 18:01:50 +01:00
dirty-bitmap.c block: Mark bdrv_*_dirty_bitmap() and callers GRAPH_RDLOCK 2023-02-23 19:49:32 +01:00
dmg-bz2.c
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 file-posix: Handle suspended dm-multipath better for SG_IO 2025-12-04 18:34:15 +01:00
file-win32.c block: replace TABs with space 2025-11-11 22:06:09 +01:00
filter-compress.c block: Take graph lock for most of .bdrv_open 2023-11-08 17:56:18 +01:00
gluster.c gluster: Do not move coroutine into BDS context 2025-11-18 18:01:50 +01:00
graph-lock.c block: add bdrv_graph_wrlock_drained() convenience wrapper 2025-07-14 15:40:58 +02:00
io.c block/io: Take reqs_lock for tracked_requests 2025-11-18 18:01:54 +01:00
io_uring.c block/io_uring: use non-vectored read/write when possible 2025-11-11 22:06:09 +01:00
iscsi-opts.c modules: add block module annotations 2021-07-09 18:20:27 +02:00
iscsi.c iscsi: Create AIO BH in original AioContext 2025-11-18 18:01:57 +01:00
linux-aio.c block: skip automatic zero-init of large array in ioq_submit 2025-06-12 13:39:08 -04:00
meson.build include: Rename sysemu/ -> system/ 2024-12-20 17:44:56 +01:00
mirror.c block: drop wrapper for bdrv_set_backing_hd_drained() 2025-07-14 15:41:58 +02:00
nbd.c treewide: handle result of qio_channel_set_blocking() 2025-09-19 12:46:07 +01:00
nfs.c nfs: Run co BH CB in the coroutine’s AioContext 2025-11-18 18:01:50 +01:00
null.c null-aio: Run CB in original AioContext 2025-11-18 18:01:57 +01:00
nvme.c nvme: Note in which AioContext some functions run 2025-11-18 18:01:53 +01:00
parallels-ext.c qapi/crypto: Rename QCryptoHashAlgorithm to *Algo, and drop prefix 2024-09-10 14:02:16 +02:00
parallels.c block: Allow drivers to control protocol prefix at creation 2025-11-11 22:06:09 +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-system.c qapi: Move include/qapi/qmp/ to include/qobject/ 2025-02-10 15:33:16 +01:00
qapi.c qemu-img info: Optionally show block limits 2025-10-29 12:10:10 +01:00
qcow.c block: Allow drivers to control protocol prefix at creation 2025-11-11 22:06:09 +01:00
qcow2-bitmap.c block/qcow2-bitmap: Replace g_memdup() by g_memdup2() 2024-05-08 19:11:34 +02:00
qcow2-cache.c qcow2: Mark qcow2_signal_corruption() and callers GRAPH_RDLOCK 2023-10-12 16:31:33 +02:00
qcow2-cluster.c qcow2: put discards in discard queue when discard-no-unref is enabled 2025-11-11 22:06:09 +01:00
qcow2-refcount.c qcow2: put discards in discard queue when discard-no-unref is enabled 2025-11-11 22:06:09 +01:00
qcow2-snapshot.c include: Rename sysemu/ -> system/ 2024-12-20 17:44:56 +01:00
qcow2-threads.c thread-pool: avoid passing the pool parameter every time 2023-04-25 13:17:28 +02:00
qcow2.c qcow2: Schedule cache-clean-timer in realtime 2025-11-18 18:01:55 +01:00
qcow2.h qcow2: Fix cache_clean_timer 2025-11-18 18:01:55 +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-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: Allow drivers to control protocol prefix at creation 2025-11-11 22:06:09 +01:00
qed.h block: Protect bs->file with graph_lock 2023-11-08 17:56:18 +01:00
quorum.c block: add bdrv_graph_wrlock_drained() convenience wrapper 2025-07-14 15:40:58 +02:00
raw-format.c block: Allow drivers to control protocol prefix at creation 2025-11-11 22:06:09 +01:00
rbd.c rbd: Run co BH CB in the coroutine’s AioContext 2025-11-18 18:01:50 +01:00
replication.c block: mark bdrv_reopen_queue() and bdrv_reopen_multiple() as GRAPH_UNLOCKED 2025-07-14 15:42:05 +02:00
reqlist.c block/reqlist: allow adding overlapping requests 2024-09-30 10:53:18 +03:00
snapshot-access.c block: Expand block status mode from bool to flags 2025-05-14 15:33:34 -05:00
snapshot.c block: add bdrv_graph_wrlock_drained() convenience wrapper 2025-07-14 15:40:58 +02:00
ssh.c ssh: Run restart_coroutine in current AioContext 2025-11-18 18:01:55 +01:00
stream.c block/stream: mark stream_prepare() as GRAPH_UNLOCKED 2025-07-14 15:42:04 +02:00
throttle-groups.c qom: Make InterfaceInfo[] uses const 2025-04-25 17:00:41 +02:00
throttle.c block: Take graph lock for most of .bdrv_open 2023-11-08 17:56:18 +01:00
trace-events block/io_uring: use aio_add_sqe() 2025-11-11 22:06:09 +01:00
trace.h trace: switch position of headers to what Meson requires 2020-08-21 06:18:24 -04:00
vdi.c block: Allow drivers to control protocol prefix at creation 2025-11-11 22:06:09 +01:00
vhdx-endian.c
vhdx-log.c vhdx: Take locks for accessing bs->file 2023-11-08 17:56:18 +01:00
vhdx.c block: Allow drivers to control protocol prefix at creation 2025-11-11 22:06:09 +01:00
vhdx.h vhdx: Take locks for accessing bs->file 2023-11-08 17:56:18 +01:00
vmdk.c qcow2, vmdk: Restrict creation with secondary file using protocol 2025-11-11 22:06:09 +01:00
vpc.c block: Allow drivers to control protocol prefix at creation 2025-11-11 22:06:09 +01:00
vvfat.c block: Expand block status mode from bool to flags 2025-05-14 15:33:34 -05:00
win32-aio.c win32-aio: Run CB in original context 2025-11-18 18:01:57 +01:00
write-threshold.c block: remove AioContext locking 2023-12-21 22:49:27 +01:00