qemu-kvm/kvm-file-posix-try-BLKSECTGET-on-block-devices-too-do-no.patch
Miroslav Rezanina 88586bd480 * Sun Jul 25 2021 Miroslav Rezanina <mrezanin@redhat.com> - 6.0.0-10
- kvm-s390x-css-Introduce-an-ESW-struct.patch [bz#1957194]
- kvm-s390x-css-Split-out-the-IRB-sense-data.patch [bz#1957194]
- kvm-s390x-css-Refactor-IRB-construction.patch [bz#1957194]
- kvm-s390x-css-Add-passthrough-IRB.patch [bz#1957194]
- kvm-vhost-user-blk-Fail-gracefully-on-too-large-queue-si.patch [bz#1957194]
- kvm-vhost-user-blk-Make-sure-to-set-Error-on-realize-fai.patch [bz#1957194]
- kvm-vhost-user-blk-Don-t-reconnect-during-initialisation.patch [bz#1957194]
- kvm-vhost-user-blk-Improve-error-reporting-in-realize.patch [bz#1957194]
- kvm-vhost-user-blk-Get-more-feature-flags-from-vhost-dev.patch [bz#1957194]
- kvm-virtio-Fail-if-iommu_platform-is-requested-but-unsup.patch [bz#1957194]
- kvm-vhost-user-blk-Check-that-num-queues-is-supported-by.patch [bz#1957194]
- kvm-vhost-user-Fix-backends-without-multiqueue-support.patch [bz#1957194]
- kvm-file-posix-fix-max_iov-for-dev-sg-devices.patch [bz#1957194]
- kvm-scsi-generic-pass-max_segments-via-max_iov-field-in-.patch [bz#1957194]
- kvm-osdep-provide-ROUND_DOWN-macro.patch [bz#1957194]
- kvm-block-backend-align-max_transfer-to-request-alignmen.patch [bz#1957194]
- kvm-block-add-max_hw_transfer-to-BlockLimits.patch [bz#1957194]
- kvm-file-posix-try-BLKSECTGET-on-block-devices-too-do-no.patch [bz#1957194]
- kvm-block-Add-option-to-use-driver-whitelist-even-in-too.patch [bz#1957782]
- kvm-spec-Restrict-block-drivers-in-tools.patch [bz#1957782]
- kvm-Move-tools-to-separate-package.patch [bz#1972285]
- kvm-Split-qemu-pr-helper-to-separate-package.patch [bz#1972300]
- kvm-spec-RPM_BUILD_ROOT-buildroot.patch [bz#1973029]
- kvm-spec-More-use-of-name-instead-of-qemu-kvm.patch [bz#1973029]
- kvm-spec-Use-qemu-pr-helper.service-from-qemu.git.patch [bz#1973029]
- kvm-spec-Use-_sourcedir-for-referencing-sources.patch [bz#1973029]
- kvm-spec-Add-tools_only.patch [bz#1973029]
- kvm-spec-build-Add-run_configure-helper.patch [bz#1973029]
- kvm-spec-build-Disable-more-bits-with-disable_everything.patch [bz#1973029]
- kvm-spec-build-Add-macros-for-some-configure-parameters.patch [bz#1973029]
- kvm-spec-files-Move-qemu-guest-agent-and-qemu-img-earlie.patch [bz#1973029]
- kvm-spec-install-Remove-redundant-bits.patch [bz#1973029]
- kvm-spec-install-Add-modprobe_kvm_conf-macro.patch [bz#1973029]
- kvm-spec-install-Remove-qemu-guest-agent-etc-qemu-kvm-us.patch [bz#1973029]
- kvm-spec-install-clean-up-qemu-ga-section.patch [bz#1973029]
- kvm-spec-install-Use-a-single-tools_only-section.patch [bz#1973029]
- kvm-spec-Make-tools_only-not-cross-spec-sections.patch [bz#1973029]
- kvm-spec-install-Limit-time-spent-in-qemu_kvm_build.patch [bz#1973029]
- kvm-spec-misc-syntactic-merges-with-Fedora.patch [bz#1973029]
- kvm-spec-Use-Fedora-s-pattern-for-specifying-rc-version.patch [bz#1973029]
- kvm-spec-files-don-t-use-fine-grained-docs-file-list.patch [bz#1973029]
- kvm-spec-files-Add-licenses-to-qemu-common-too.patch [bz#1973029]
- kvm-spec-install-Drop-python3-shebang-fixup.patch [bz#1973029]
- Resolves: bz#1957194
  (Synchronize RHEL-AV 8.5.0 changes to RHEL 9.0.0 Beta)
- Resolves: bz#1957782
  (VMDK support should be read-only)
- Resolves: bz#1972285
  (Split out a qemu-kvm-tools subpackage)
- Resolves: bz#1972300
  (Split out a qemu-pr-helper subpackage)
- Resolves: bz#1973029
  (Spec file cleanups)
2021-07-25 22:55:18 -04:00

141 lines
4.2 KiB
Diff

From 9c8493d3a6d2e4d879d1ef67ff1abebd532c87a0 Mon Sep 17 00:00:00 2001
From: Paolo Bonzini <pbonzini@redhat.com>
Date: Fri, 16 Jul 2021 16:51:34 -0400
Subject: [PATCH 18/43] file-posix: try BLKSECTGET on block devices too, do not
round to power of 2
RH-Author: Miroslav Rezanina <mrezanin@redhat.com>
RH-Bugzilla: 1957194
bs->sg is only true for character devices, but block devices can also
be used with scsi-block and scsi-generic. Unfortunately BLKSECTGET
returns bytes in an int for /dev/sgN devices, and sectors in a short
for block devices, so account for that in the code.
The maximum transfer also need not be a power of 2 (for example I have
seen disks with 1280 KiB maximum transfer) so there's no need to pass
the result through pow2floor.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
(cherry picked from commit 18473467d55a20d643b6c9b3a52de42f705b4d35)
Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
---
block/file-posix.c | 57 +++++++++++++++++++++++++++-------------------
1 file changed, 33 insertions(+), 24 deletions(-)
diff --git a/block/file-posix.c b/block/file-posix.c
index 44325a635d..7b4ebf65d5 100644
--- a/block/file-posix.c
+++ b/block/file-posix.c
@@ -1173,22 +1173,27 @@ static void raw_reopen_abort(BDRVReopenState *state)
s->reopen_state = NULL;
}
-static int sg_get_max_transfer_length(int fd)
+static int hdev_get_max_hw_transfer(int fd, struct stat *st)
{
#ifdef BLKSECTGET
- int max_bytes = 0;
-
- if (ioctl(fd, BLKSECTGET, &max_bytes) == 0) {
- return max_bytes;
+ if (S_ISBLK(st->st_mode)) {
+ unsigned short max_sectors = 0;
+ if (ioctl(fd, BLKSECTGET, &max_sectors) == 0) {
+ return max_sectors * 512;
+ }
} else {
- return -errno;
+ int max_bytes = 0;
+ if (ioctl(fd, BLKSECTGET, &max_bytes) == 0) {
+ return max_bytes;
+ }
}
+ return -errno;
#else
return -ENOSYS;
#endif
}
-static int sg_get_max_segments(int fd)
+static int hdev_get_max_segments(int fd, struct stat *st)
{
#ifdef CONFIG_LINUX
char buf[32];
@@ -1197,26 +1202,20 @@ static int sg_get_max_segments(int fd)
int ret;
int sysfd = -1;
long max_segments;
- struct stat st;
-
- if (fstat(fd, &st)) {
- ret = -errno;
- goto out;
- }
- if (S_ISCHR(st.st_mode)) {
+ if (S_ISCHR(st->st_mode)) {
if (ioctl(fd, SG_GET_SG_TABLESIZE, &ret) == 0) {
return ret;
}
return -ENOTSUP;
}
- if (!S_ISBLK(st.st_mode)) {
+ if (!S_ISBLK(st->st_mode)) {
return -ENOTSUP;
}
sysfspath = g_strdup_printf("/sys/dev/block/%u:%u/queue/max_segments",
- major(st.st_rdev), minor(st.st_rdev));
+ major(st->st_rdev), minor(st->st_rdev));
sysfd = open(sysfspath, O_RDONLY);
if (sysfd == -1) {
ret = -errno;
@@ -1253,23 +1252,33 @@ out:
static void raw_refresh_limits(BlockDriverState *bs, Error **errp)
{
BDRVRawState *s = bs->opaque;
+ struct stat st;
- if (bs->sg) {
- int ret = sg_get_max_transfer_length(s->fd);
+ raw_probe_alignment(bs, s->fd, errp);
+ bs->bl.min_mem_alignment = s->buf_align;
+ bs->bl.opt_mem_alignment = MAX(s->buf_align, qemu_real_host_page_size);
+
+ /*
+ * Maximum transfers are best effort, so it is okay to ignore any
+ * errors. That said, based on the man page errors in fstat would be
+ * very much unexpected; the only possible case seems to be ENOMEM.
+ */
+ if (fstat(s->fd, &st)) {
+ return;
+ }
+
+ if (bs->sg || S_ISBLK(st.st_mode)) {
+ int ret = hdev_get_max_hw_transfer(s->fd, &st);
if (ret > 0 && ret <= BDRV_REQUEST_MAX_BYTES) {
- bs->bl.max_hw_transfer = pow2floor(ret);
+ bs->bl.max_hw_transfer = ret;
}
- ret = sg_get_max_segments(s->fd);
+ ret = hdev_get_max_segments(s->fd, &st);
if (ret > 0) {
bs->bl.max_iov = ret;
}
}
-
- raw_probe_alignment(bs, s->fd, errp);
- bs->bl.min_mem_alignment = s->buf_align;
- bs->bl.opt_mem_alignment = MAX(s->buf_align, qemu_real_host_page_size);
}
static int check_for_dasd(int fd)
--
2.27.0