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qemu-kvm/kvm-block-Add-flags-parameter-to-blk_-_pdiscard.patch
Miroslav Rezanina 12bff683cd * Wed Aug 05 2026 Miroslav Rezanina <mrezanin@redhat.com> - 10.1.0-23 
- kvm-scsi-change-buf_size-to-unsigned-int-in-scsi_SG_IO.patch [RHEL-158244]
- kvm-scsi-handle-reservation-changes-across-migration.patch [RHEL-158244]
- kvm-blkdebug-Add-delay-ns-option.patch [RHEL-190701]
- kvm-block-Add-blk_co_start-end_request-and-BDRV_REQ_NO_Q.patch [RHEL-190701]
- kvm-block-Add-flags-parameter-to-blk_-_pdiscard.patch [RHEL-190701]
- kvm-ide-Minimal-fix-for-deadlock-between-TRIM-and-drain.patch [RHEL-190701]
- kvm-ide-Clean-up-ide_trim_co_entry-to-be-idiomatic-corou.patch [RHEL-190701]
- kvm-ide-test-Factor-out-wait_dma_completion.patch [RHEL-190701]
- kvm-ide-test-Test-reset-during-TRIM.patch [RHEL-190701]
- kvm-spec-Install-qtests-into-qemu-kvm-tests-package.patch [RHEL-190701]
- kvm-migration-introduce-MIGRATION_STATUS_FAILING.patch [RHEL-45628]
- kvm-s390x-css-limit-number-of-CHPIDs-in-description.patch [RHEL-193033]
- kvm-s390x-ioinst-Require-strict-length-and-format-for-SE.patch [RHEL-193033]
- kvm-s390x-pci-Shrink-RPCIT-ranges-to-registered-window.patch [RHEL-193033]
- kvm-s390x-pci-Tighten-region-detection-for-BAR-read-writ.patch [RHEL-193033]
- kvm-s390x-sclp-reject-invalid-write-event-data-headers.patch [RHEL-193033]
- kvm-s390x-kvm-clamp-stsi-3.2.2-size.patch [RHEL-193033]
- kvm-s390x-sclp-prevent-re-reading-the-sclp-header.patch [RHEL-193033]
- kvm-s390x-sclpcpi-check-event-length-field-before-readin.patch [RHEL-193033]
- kvm-s390x-css-firm-up-handling-of-chained-TIC-CCWs.patch [RHEL-193033]
- Resolves: RHEL-158244
  (live migration failed or get failed WSFC test result during WSFC testing [rhel-9.9])
- Resolves: RHEL-190701
  (qemu-kvm hung during drain after double pause [rhel-9])
- Resolves: RHEL-45628
  (qemu-kvm crashes after kill virtproxyd on destination host during migration [RHEL-9.9])
- Resolves: RHEL-193033
  (RHEL9.4 - qemu s390x: interface harding fixes)
2026-08-05 08:51:47 +02:00

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From f75aa9de908bff1ef8f4966c8a5f7794be2749c5 Mon Sep 17 00:00:00 2001
From: Kevin Wolf <kwolf@redhat.com>
Date: Tue, 21 Apr 2026 18:11:28 +0200
Subject: [PATCH 05/20] block: Add flags parameter to blk_*_pdiscard()
RH-Author: Kevin Wolf <kwolf@redhat.com>
RH-MergeRequest: 507: ide: Fix deadlock between TRIM and drain
RH-Jira: RHEL-190701
RH-Acked-by: German Maglione <None>
RH-Acked-by: Hanna Czenczek <hreitz@redhat.com>
RH-Commit: [3/8] 6e4053e2aed18830b60479e2fb1d763d123b7789 (kmwolf/centos-qemu-kvm)
All existing callers pass 0, but we need a way to pass BDRV_REQ_NO_QUEUE
for discard requests.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-ID: <20260421161132.99878-4-kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
(cherry picked from commit 53074ba0330ae8831abbae2521c012e1d9072ed3)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
block/block-backend.c | 11 ++++++-----
block/export/virtio-blk-handler.c | 2 +-
block/mirror.c | 4 ++--
include/system/block-backend-io.h | 4 ++--
nbd/server.c | 2 +-
qemu-io-cmds.c | 2 +-
tests/unit/test-block-iothread.c | 4 ++--
7 files changed, 15 insertions(+), 14 deletions(-)
diff --git a/block/block-backend.c b/block/block-backend.c
index a0f4c841da..d97b26b743 100644
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -1803,12 +1803,13 @@ BlockAIOCB *blk_aio_ioctl(BlockBackend *blk, unsigned long int req, void *buf,
/* To be called between exactly one pair of blk_inc/dec_in_flight() */
static int coroutine_fn
-blk_co_do_pdiscard(BlockBackend *blk, int64_t offset, int64_t bytes)
+blk_co_do_pdiscard(BlockBackend *blk, int64_t offset, int64_t bytes,
+ BdrvRequestFlags flags)
{
int ret;
IO_CODE();
- blk_wait_while_drained(blk, 0);
+ blk_wait_while_drained(blk, flags);
GRAPH_RDLOCK_GUARD();
ret = blk_check_byte_request(blk, offset, bytes);
@@ -1824,7 +1825,7 @@ static void coroutine_fn blk_aio_pdiscard_entry(void *opaque)
BlkAioEmAIOCB *acb = opaque;
BlkRwCo *rwco = &acb->rwco;
- rwco->ret = blk_co_do_pdiscard(rwco->blk, rwco->offset, acb->bytes);
+ rwco->ret = blk_co_do_pdiscard(rwco->blk, rwco->offset, acb->bytes, 0);
blk_aio_complete(acb);
}
@@ -1838,13 +1839,13 @@ BlockAIOCB *blk_aio_pdiscard(BlockBackend *blk,
}
int coroutine_fn blk_co_pdiscard(BlockBackend *blk, int64_t offset,
- int64_t bytes)
+ int64_t bytes, BdrvRequestFlags flags)
{
int ret;
IO_OR_GS_CODE();
blk_inc_in_flight(blk);
- ret = blk_co_do_pdiscard(blk, offset, bytes);
+ ret = blk_co_do_pdiscard(blk, offset, bytes, flags);
blk_dec_in_flight(blk);
return ret;
diff --git a/block/export/virtio-blk-handler.c b/block/export/virtio-blk-handler.c
index bc1cec6757..b82baae553 100644
--- a/block/export/virtio-blk-handler.c
+++ b/block/export/virtio-blk-handler.c
@@ -121,7 +121,7 @@ virtio_blk_discard_write_zeroes(VirtioBlkHandler *handler, struct iovec *iov,
}
if (blk_co_pdiscard(blk, sector << VIRTIO_BLK_SECTOR_BITS,
- bytes) == 0) {
+ bytes, 0) == 0) {
return VIRTIO_BLK_S_OK;
}
}
diff --git a/block/mirror.c b/block/mirror.c
index f01be99b55..c87f1e205b 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -454,7 +454,7 @@ static void coroutine_fn mirror_co_discard(void *opaque)
*op->bytes_handled = op->bytes;
op->is_in_flight = true;
- ret = blk_co_pdiscard(op->s->target, op->offset, op->bytes);
+ ret = blk_co_pdiscard(op->s->target, op->offset, op->bytes, 0);
mirror_write_complete(op, ret);
}
@@ -1527,7 +1527,7 @@ do_sync_target_write(MirrorBlockJob *job, MirrorMethod method,
zero_bitmap_end - zero_bitmap_offset);
}
assert(!qiov);
- ret = blk_co_pdiscard(job->target, offset, bytes);
+ ret = blk_co_pdiscard(job->target, offset, bytes, 0);
break;
default:
diff --git a/include/system/block-backend-io.h b/include/system/block-backend-io.h
index 59841e04a8..91c48299b7 100644
--- a/include/system/block-backend-io.h
+++ b/include/system/block-backend-io.h
@@ -217,9 +217,9 @@ int co_wrapper_mixed blk_zone_append(BlockBackend *blk, int64_t *offset,
BdrvRequestFlags flags);
int co_wrapper_mixed blk_pdiscard(BlockBackend *blk, int64_t offset,
- int64_t bytes);
+ int64_t bytes, BdrvRequestFlags flags);
int coroutine_fn blk_co_pdiscard(BlockBackend *blk, int64_t offset,
- int64_t bytes);
+ int64_t bytes, BdrvRequestFlags flags);
int co_wrapper_mixed blk_flush(BlockBackend *blk);
int coroutine_fn blk_co_flush(BlockBackend *blk);
diff --git a/nbd/server.c b/nbd/server.c
index d242be9811..c72dee7a3b 100644
--- a/nbd/server.c
+++ b/nbd/server.c
@@ -2982,7 +2982,7 @@ static coroutine_fn int nbd_handle_request(NBDClient *client,
"flush failed", errp);
case NBD_CMD_TRIM:
- ret = blk_co_pdiscard(exp->common.blk, request->from, request->len);
+ ret = blk_co_pdiscard(exp->common.blk, request->from, request->len, 0);
if (ret >= 0 && request->flags & NBD_CMD_FLAG_FUA) {
ret = blk_co_flush(exp->common.blk);
}
diff --git a/qemu-io-cmds.c b/qemu-io-cmds.c
index 13e0330162..f6d077908f 100644
--- a/qemu-io-cmds.c
+++ b/qemu-io-cmds.c
@@ -2201,7 +2201,7 @@ static int discard_f(BlockBackend *blk, int argc, char **argv)
}
clock_gettime(CLOCK_MONOTONIC, &t1);
- ret = blk_pdiscard(blk, offset, bytes);
+ ret = blk_pdiscard(blk, offset, bytes, 0);
clock_gettime(CLOCK_MONOTONIC, &t2);
if (ret < 0) {
diff --git a/tests/unit/test-block-iothread.c b/tests/unit/test-block-iothread.c
index e26b3be593..5273ff235a 100644
--- a/tests/unit/test-block-iothread.c
+++ b/tests/unit/test-block-iothread.c
@@ -270,11 +270,11 @@ static void test_sync_op_blk_pdiscard(BlockBackend *blk)
int ret;
/* Early success: UNMAP not supported */
- ret = blk_pdiscard(blk, 0, 512);
+ ret = blk_pdiscard(blk, 0, 512, 0);
g_assert_cmpint(ret, ==, 0);
/* Early error: Negative offset */
- ret = blk_pdiscard(blk, -2, 512);
+ ret = blk_pdiscard(blk, -2, 512, 0);
g_assert_cmpint(ret, ==, -EIO);
}
--
2.52.0
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