5b15e2ecaf
Notable changes:
* The only big change is the switch to using a custom QIOChannel for
savevm-async, because the previously used QEMUFileOps was dropped.
Changes to the current implementation:
* Switch to vector based methods as required for an IO channel. For
short reads the passed-in IO vector is stuffed with zeroes at the
end, just to be sure.
* For reading: The documentation in include/io/channel.h states that
at least one byte should be read, so also error out when whe are
at the very end instead of returning 0.
* For reading: Fix off-by-one error when request goes beyond end.
The wrong code piece was:
if ((pos + size) > maxlen) {
size = maxlen - pos - 1;
}
Previously, the last byte would not be read. It's actually
possible to get a snapshot .raw file that has content all the way
up the final 512 byte (= BDRV_SECTOR_SIZE) boundary without any
trailing zero bytes (I wrote a script to do it).
Luckily, it didn't cause a real issue, because qemu_loadvm_state()
is not interested in the final (i.e. QEMU_VM_VMDESCRIPTION)
section. The buffer for reading it is simply freed up afterwards
and the function will assume that it read the whole section, even
if that's not the case.
* For writing: Make use of the generated blk_pwritev() wrapper
instead of manually wrapping the coroutine to simplify and save a
few lines.
* Adapt to changed interfaces for blk_{pread,pwrite}:
* a9262f551e ("block: Change blk_{pread,pwrite}() param order")
* 3b35d4542c ("block: Add a 'flags' param to blk_pread()")
* bf5b16fa40 ("block: Make blk_{pread,pwrite}() return 0 on success")
Those changes especially affected the qemu-img dd patches, because
the context also changed, but also some of our block drivers used
the functions.
* Drop qemu-common.h include: it got renamed after essentially
everything was moved to other headers. The only remaining user I
could find for things dropped from the header between 7.0 and 7.1
was qemu_get_vm_name() in the iscsi-initiatorname patch, but it
already includes the header to which the function was moved.
Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
60 lines
2.0 KiB
Diff
60 lines
2.0 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Fabian Ebner <f.ebner@proxmox.com>
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Date: Wed, 25 May 2022 13:59:37 +0200
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Subject: [PATCH] PVE-Backup: create jobs: correctly cancel in error scenario
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The first call to job_cancel_sync() will cancel and free all jobs in
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the transaction, so ensure that it's called only once and get rid of
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the job_unref() that would operate on freed memory.
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It's also necessary to NULL backup_state.pbs in the error scenario,
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because a subsequent backup_cancel QMP call (as happens in PVE when
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the backup QMP command fails) would try to call proxmox_backup_abort()
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and run into a segfault.
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Signed-off-by: Fabian Ebner <f.ebner@proxmox.com>
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Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
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---
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pve-backup.c | 10 ++++++++--
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1 file changed, 8 insertions(+), 2 deletions(-)
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diff --git a/pve-backup.c b/pve-backup.c
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index f6a5f8c785..5bed6f4014 100644
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--- a/pve-backup.c
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+++ b/pve-backup.c
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@@ -506,6 +506,11 @@ static void create_backup_jobs_bh(void *opaque) {
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}
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if (*errp) {
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+ /*
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+ * It's enough to cancel one job in the transaction, the rest will
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+ * follow automatically.
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+ */
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+ bool canceled = false;
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l = backup_state.di_list;
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while (l) {
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PVEBackupDevInfo *di = (PVEBackupDevInfo *)l->data;
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@@ -516,12 +521,12 @@ static void create_backup_jobs_bh(void *opaque) {
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di->target = NULL;
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}
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- if (di->job) {
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+ if (!canceled && di->job) {
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AioContext *ctx = di->job->job.aio_context;
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aio_context_acquire(ctx);
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job_cancel_sync(&di->job->job, true);
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- job_unref(&di->job->job);
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aio_context_release(ctx);
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+ canceled = true;
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}
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}
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}
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@@ -947,6 +952,7 @@ err:
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if (pbs) {
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proxmox_backup_disconnect(pbs);
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+ backup_state.pbs = NULL;
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}
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if (backup_dir) {
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