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
aio_task.c
amend.c
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
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
coroutines.h
create.c
crypto.c	block: use int64_t instead of uint64_t in driver write handlers	2021-09-29 13:46:31 -05:00
crypto.h
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
dmg-lzfse.c
dmg.c	block: use int64_t instead of uint64_t in driver read handlers	2021-09-29 13:46:31 -05:00
dmg.h
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.c
parallels.h
preallocate.c	block: use int64_t instead of int in driver discard handlers	2021-09-29 13:46:32 -05:00
progress_meter.c
qapi-sysemu.c
qapi.c
qcow2-bitmap.c
qcow2-cache.c
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
qcow2-threads.c
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
qed-cluster.c
qed-l2-cache.c
qed-table.c
qed.c	block: use int64_t instead of int in driver write_zeroes handlers	2021-09-29 13:46:32 -05:00
qed.h
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
ssh.c	util/uri: do not check argument of uri_free()	2021-07-09 12:26:05 +02:00
stream.c
throttle-groups.c
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
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
vhdx-log.c
vhdx.c
vhdx.h
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
write-threshold.c