Paolo Bonzini cc07162953 block: introduce max_hw_iov for use in scsi-generic ... Linux limits the size of iovecs to 1024 (UIO_MAXIOV in the kernel sources, IOV_MAX in POSIX). Because of this, on some host adapters requests with many iovecs are rejected with -EINVAL by the io_submit() or readv()/writev() system calls. In fact, the same limit applies to SG_IO as well. To fix both the EINVAL and the possible performance issues from using fewer iovecs than allowed by Linux (some HBAs have max_segments as low as 128), introduce a separate entry in BlockLimits to hold the max_segments value from sysfs. This new limit is used only for SG_IO and clamped to bs->bl.max_iov anyway, just like max_hw_transfer is clamped to bs->bl.max_transfer. Reported-by: Halil Pasic <pasic@linux.ibm.com> Cc: Hanna Reitz <hreitz@redhat.com> Cc: Kevin Wolf <kwolf@redhat.com> Cc: qemu-block@nongnu.org Cc: qemu-stable@nongnu.org Fixes: 18473467d5 ("file-posix: try BLKSECTGET on block devices too, do not round to power of 2", 2021-06-25) Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <20210923130436.1187591-1-pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>		2021-10-06 10:25:55 +02:00
..
export	block/export/fuse.c: fix fuse-lseek on uclibc or musl	2021-09-01 14:38:08 +02:00
monitor	block/monitor: Consolidate hmp_handle_error calls to reduce redundant code	2021-09-01 12:57:31 +02:00
accounting.c	block/accounting: Use lock guard macros	2020-12-11 17:52:39 +01:00
aio_task.c	block: introduce aio task pool	2019-10-10 10:56:17 +02:00
amend.c	block/amend: Check whether the node exists	2020-07-27 12:37:25 +02:00
backup.c	block/copy-before-write: initialize block-copy bitmap	2021-09-01 14:03:47 +02:00
blkdebug.c	block: use int64_t instead of int in driver discard handlers	2021-09-29 13:46:32 -05:00
blklogwrites.c	block: use int64_t instead of int in driver discard handlers	2021-09-29 13:46:32 -05:00
blkreplay.c	block: use int64_t instead of int in driver discard handlers	2021-09-29 13:46:32 -05:00
blkverify.c	block: use int64_t instead of uint64_t in driver write handlers	2021-09-29 13:46:31 -05:00
block-backend.c	block: introduce max_hw_iov for use in scsi-generic	2021-10-06 10:25:55 +02:00
block-copy.c	block/block-copy: block_copy_state_new(): drop extra arguments	2021-09-01 14:38:08 +02:00
block-gen.h	scripts: add block-coroutine-wrapper.py	2020-10-05 10:59:06 +01:00
bochs.c	block: use int64_t instead of uint64_t in driver read handlers	2021-09-29 13:46:31 -05:00
cloop.c	block: use int64_t instead of uint64_t in driver read handlers	2021-09-29 13:46:31 -05:00
commit.c	block: use int64_t instead of uint64_t in driver read handlers	2021-09-29 13:46:31 -05:00
copy-before-write.c	block: use int64_t instead of int in driver discard handlers	2021-09-29 13:46:32 -05:00
copy-before-write.h	block/copy-before-write: bdrv_cbw_append(): drop unused compress arg	2021-09-01 14:03:47 +02:00
copy-on-read.c	block: use int64_t instead of int in driver discard handlers	2021-09-29 13:46:32 -05:00
copy-on-read.h	copy-on-read: add filter drop function	2021-01-26 11:26:54 +01:00
coroutines.h	block/nbd: reuse nbd_co_do_establish_connection() in nbd_open()	2021-06-18 12:21:22 -05:00
create.c	block/create: Do not abort if a block driver is not available	2019-09-13 12:18:37 +02:00
crypto.c	block: use int64_t instead of uint64_t in driver write handlers	2021-09-29 13:46:31 -05:00
crypto.h	nomaintainer: Fix Lesser GPL version number	2020-11-15 17:04:40 +01:00
curl.c	block: use int64_t instead of uint64_t in driver read handlers	2021-09-29 13:46:31 -05:00
dirty-bitmap.c	iotests: Improve and rename test 291 to qemu-img-bitmap	2021-07-21 14:14:41 -05:00
dmg-bz2.c	Include qemu-common.h exactly where needed	2019-06-12 13:20:20 +02:00
dmg-lzfse.c	block: Remove unused include	2020-11-09 15:44:21 +01:00
dmg.c	block: use int64_t instead of uint64_t in driver read handlers	2021-09-29 13:46:31 -05:00
dmg.h	Include qemu-common.h exactly where needed	2019-06-12 13:20:20 +02:00
file-posix.c	block: introduce max_hw_iov for use in scsi-generic	2021-10-06 10:25:55 +02:00
file-win32.c	block: use int64_t instead of uint64_t in driver write handlers	2021-09-29 13:46:31 -05:00
filter-compress.c	block: use int64_t instead of int in driver discard handlers	2021-09-29 13:46:32 -05:00
gluster.c	block: use int64_t instead of int in driver discard handlers	2021-09-29 13:46:32 -05:00
io_uring.c	block/io_uring: resubmit when result is -EAGAIN	2021-07-29 17:14:55 +01:00
io.c	block: introduce max_hw_iov for use in scsi-generic	2021-10-06 10:25:55 +02:00
iscsi-opts.c	modules: add block module annotations	2021-07-09 18:20:27 +02:00
iscsi.c	block: use int64_t instead of int in driver discard handlers	2021-09-29 13:46:32 -05:00
linux-aio.c	linux-aio: limit the batch size using aio-max-batch parameter	2021-07-21 13:47:50 +01:00
meson.build	block: rename backup-top to copy-before-write	2021-09-01 12:57:31 +02:00
mirror.c	block: use int64_t instead of int in driver discard handlers	2021-09-29 13:46:32 -05:00
nbd.c	block/nbd: check that received handle is valid	2021-09-29 13:46:33 -05:00
nfs.c	block: use int64_t instead of uint64_t in driver write handlers	2021-09-29 13:46:31 -05:00
null.c	block: use int64_t instead of uint64_t in driver write handlers	2021-09-29 13:46:31 -05:00
nvme.c	block: use int64_t instead of int in driver discard handlers	2021-09-29 13:46:32 -05:00
parallels-ext.c	parallels: support bitmap extension for read-only mode	2021-03-08 14:56:55 +01:00
parallels.c	parallels: support bitmap extension for read-only mode	2021-03-08 14:56:55 +01:00
parallels.h	parallels: support bitmap extension for read-only mode	2021-03-08 14:56:55 +01:00
preallocate.c	block: use int64_t instead of int in driver discard handlers	2021-09-29 13:46:32 -05:00
progress_meter.c	progressmeter: protect with a mutex	2021-06-25 14:24:24 +03:00
qapi-sysemu.c	block: Move system emulator QMP commands to block/qapi-sysemu.c	2020-03-06 17:15:38 +01:00
qapi.c	block: use GDateTime for formatting timestamp when dumping snapshot info	2021-06-14 13:28:50 +01:00
qcow2-bitmap.c	nbd patches for 2021-03-09	2021-03-11 13:57:08 +00:00
qcow2-cache.c	core: replace getpagesize() with qemu_real_host_page_size	2019-10-26 15:38:06 +02:00
qcow2-cluster.c	block: use int64_t instead of uint64_t in driver read handlers	2021-09-29 13:46:31 -05:00
qcow2-refcount.c	qcow2-refcount: check_refblocks(): add separate message for reserved	2021-09-15 18:42:38 +02:00
qcow2-snapshot.c	block: consistently use bdrv_is_read_only()	2021-06-02 14:23:20 +02:00
qcow2-threads.c	qcow2: add zstd cluster compression	2020-05-13 14:20:31 +02:00
qcow2.c	block: use int64_t instead of int in driver discard handlers	2021-09-29 13:46:32 -05:00
qcow2.h	qcow2-refcount: check_refblocks(): add separate message for reserved	2021-09-15 18:42:38 +02:00
qcow.c	block: use int64_t instead of uint64_t in driver write handlers	2021-09-29 13:46:31 -05:00
qed-check.c	block/qed: add missed coroutine_fn markers	2019-04-30 15:29:00 +02:00
qed-cluster.c	qed: protect table cache with CoMutex	2017-07-17 11:34:11 +08:00
qed-l2-cache.c	qed: protect table cache with CoMutex	2017-07-17 11:34:11 +08:00
qed-table.c	block/qed: add missed coroutine_fn markers	2019-04-30 15:29:00 +02:00
qed.c	block: use int64_t instead of int in driver write_zeroes handlers	2021-09-29 13:46:32 -05:00
qed.h	qed: Simplify backing reads	2020-07-06 10:34:14 +02:00
quorum.c	block: use int64_t instead of int in driver write_zeroes handlers	2021-09-29 13:46:32 -05:00
raw-format.c	block: use int64_t instead of int in driver discard handlers	2021-09-29 13:46:32 -05:00
rbd.c	block: use int64_t instead of int in driver discard handlers	2021-09-29 13:46:32 -05:00
replication.c	replication: Remove workaround	2021-07-20 16:11:53 +02:00
snapshot.c	block/snapshot: Clarify goto fallback behavior	2021-06-24 09:49:04 +02:00
ssh.c	util/uri: do not check argument of uri_free()	2021-07-09 12:26:05 +02:00
stream.c	stream: Don't crash when node permission is denied	2021-03-19 10:15:06 +01:00
throttle-groups.c	block/throttle-groups: throttle_group_co_io_limits_intercept(): 64bit bytes	2021-02-03 08:14:00 -06:00
throttle.c	block: use int64_t instead of int in driver discard handlers	2021-09-29 13:46:32 -05:00
trace-events	block: use int64_t instead of int in driver discard handlers	2021-09-29 13:46:32 -05:00
trace.h	trace: switch position of headers to what Meson requires	2020-08-21 06:18:24 -04:00
vdi.c	block: use int64_t instead of uint64_t in driver write handlers	2021-09-29 13:46:31 -05:00
vhdx-endian.c	Include qemu-common.h exactly where needed	2019-06-12 13:20:20 +02:00
vhdx-log.c	block: consistently use bdrv_is_read_only()	2021-06-02 14:23:20 +02:00
vhdx.c	block/vhdx: Support vhdx image only with 512 bytes logical sector size	2020-09-15 11:05:13 +02:00
vhdx.h	block/vhdx: Use IEC binary prefixes for size constants	2019-04-30 15:29:00 +02:00
vmdk.c	block: use int64_t instead of int in driver write_zeroes handlers	2021-09-29 13:46:32 -05:00
vpc.c	block: use int64_t instead of uint64_t in driver write handlers	2021-09-29 13:46:31 -05:00
vvfat.c	block: use int64_t instead of uint64_t in driver write handlers	2021-09-29 13:46:31 -05:00
win32-aio.c	Include qemu/module.h where needed, drop it from qemu-common.h	2019-06-12 13:18:33 +02:00
write-threshold.c	write-threshold: deal with includes	2021-05-14 16:14:10 +02:00