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Subject: [pve-devel] [PATCH v4 qemu-server 09/11] blockdev: change aio on
target if io_uring is not default.
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From: Alexandre Derumier <alexandre.derumier@groupe-cyllene.com>
To: pve-devel@lists.proxmox.com
Subject: [PATCH v4 qemu-server 09/11] blockdev: change aio on target if io_uring is not default.
Date: Tue, 11 Mar 2025 11:29:03 +0100
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This was a limitation of drive-mirror, blockdev mirror is able
to reopen image with a different aio.
Do the change when generating the blockdev_format
Signed-off-by: Alexandre Derumier <alexandre.derumier@groupe-cyllene.com>
---
PVE/QemuServer.pm | 4 ----
PVE/QemuServer/Drive.pm | 30 +++---------------------------
2 files changed, 3 insertions(+), 31 deletions(-)
diff --git a/PVE/QemuServer.pm b/PVE/QemuServer.pm
index 63b8f332..d6aa5730 100644
--- a/PVE/QemuServer.pm
+++ b/PVE/QemuServer.pm
@@ -7735,8 +7735,6 @@ sub qemu_drive_mirror {
my $dst_drive = dclone($drive);
$dst_drive->{file} = $dst_volid;
$dst_drive->{zeroinit} = 1 if $is_zero_initialized;
- #improve: if target storage don't support aio uring,change it to default native
- #and remove clone_disk_check_io_uring()
#add new block device
my $target_file_blockdev = generate_file_blockdev($storecfg, $dst_drive);
@@ -8109,8 +8107,6 @@ sub clone_disk {
$dst_format = 'raw';
$size = PVE::QemuServer::Drive::TPMSTATE_DISK_SIZE;
} else {
- clone_disk_check_io_uring($drive, $storecfg, $src_storeid, $storeid, $use_drive_mirror);
-
$size = PVE::Storage::volume_size_info($storecfg, $drive->{file}, 10);
}
$newvolid = PVE::Storage::vdisk_alloc(
diff --git a/PVE/QemuServer/Drive.pm b/PVE/QemuServer/Drive.pm
index 9fe679dd..5b281616 100644
--- a/PVE/QemuServer/Drive.pm
+++ b/PVE/QemuServer/Drive.pm
@@ -1032,33 +1032,6 @@ my sub drive_uses_cache_direct {
return $cache_direct;
}
-# Check for bug #4525: drive-mirror will open the target drive with the same aio setting as the
-# source, but some storages have problems with io_uring, sometimes even leading to crashes.
-sub clone_disk_check_io_uring {
- my ($src_drive, $storecfg, $src_storeid, $dst_storeid, $use_drive_mirror) = @_;
-
- return if !$use_drive_mirror;
-
- # Don't complain when not changing storage.
- # Assume if it works for the source, it'll work for the target too.
- return if $src_storeid eq $dst_storeid;
-
- my $src_scfg = PVE::Storage::storage_config($storecfg, $src_storeid);
- my $dst_scfg = PVE::Storage::storage_config($storecfg, $dst_storeid);
-
- my $cache_direct = drive_uses_cache_direct($src_drive);
-
- my $src_uses_io_uring;
- if ($src_drive->{aio}) {
- $src_uses_io_uring = $src_drive->{aio} eq 'io_uring';
- } else {
- $src_uses_io_uring = storage_allows_io_uring_default($src_scfg, $cache_direct);
- }
-
- die "target storage is known to cause issues with aio=io_uring (used by current drive)\n"
- if $src_uses_io_uring && !storage_allows_io_uring_default($dst_scfg, $cache_direct);
-}
-
sub generate_blockdev_drive_aio {
my ($drive, $scfg) = @_;
@@ -1077,6 +1050,9 @@ sub generate_blockdev_drive_aio {
$aio = "threads";
}
}
+ } elsif ($drive->{aio} eq 'io_uring' && !storage_allows_io_uring_default($scfg, $cache_direct)) {
+ #change aio if io_uring is not supported by storage
+ $aio = $cache_direct ? 'native' : 'threads';
}
return $aio;
}
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