102 lines
2.9 KiB
Diff
102 lines
2.9 KiB
Diff
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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Stefan Reiter <s.reiter@proxmox.com>
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Date: Thu, 20 Aug 2020 14:31:59 +0200
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Subject: [PATCH] PVE: Add sequential job transaction support
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Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
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Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
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---
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include/qemu/job.h | 12 ++++++++++++
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job.c | 34 ++++++++++++++++++++++++++++++++++
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2 files changed, 46 insertions(+)
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diff --git a/include/qemu/job.h b/include/qemu/job.h
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index e502787dd8..963cf2bef5 100644
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--- a/include/qemu/job.h
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+++ b/include/qemu/job.h
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@@ -381,6 +381,18 @@ void job_unlock(void);
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*/
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JobTxn *job_txn_new(void);
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+/**
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+ * Create a new transaction and set it to sequential mode, i.e. run all jobs
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+ * one after the other instead of at the same time.
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+ */
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+JobTxn *job_txn_new_seq(void);
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+
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+/**
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+ * Helper method to start the first job in a sequential transaction to kick it
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+ * off. Other jobs will be run after this one completes.
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+ */
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+void job_txn_start_seq(JobTxn *txn);
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+
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/**
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* Release a reference that was previously acquired with job_txn_add_job or
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* job_txn_new. If it's the last reference to the object, it will be freed.
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diff --git a/job.c b/job.c
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index 93e22d180b..2b31f1e14f 100644
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--- a/job.c
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+++ b/job.c
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@@ -93,6 +93,8 @@ struct JobTxn {
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/* Reference count */
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int refcnt;
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+
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+ bool sequential;
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};
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void job_lock(void)
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@@ -118,6 +120,25 @@ JobTxn *job_txn_new(void)
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return txn;
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}
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+JobTxn *job_txn_new_seq(void)
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+{
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+ JobTxn *txn = job_txn_new();
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+ txn->sequential = true;
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+ return txn;
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+}
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+
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+void job_txn_start_seq(JobTxn *txn)
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+{
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+ assert(txn->sequential);
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+ assert(!txn->aborting);
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+
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+ Job *first = QLIST_FIRST(&txn->jobs);
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+ assert(first);
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+ assert(first->status == JOB_STATUS_CREATED);
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+
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+ job_start(first);
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+}
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+
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/* Called with job_mutex held. */
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static void job_txn_ref_locked(JobTxn *txn)
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{
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@@ -1057,6 +1078,12 @@ static void job_completed_txn_success_locked(Job *job)
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*/
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QLIST_FOREACH(other_job, &txn->jobs, txn_list) {
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if (!job_is_completed_locked(other_job)) {
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+ if (txn->sequential) {
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+ job_unlock();
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+ /* Needs to be called without holding the job lock */
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+ job_start(other_job);
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+ job_lock();
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+ }
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return;
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}
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assert(other_job->ret == 0);
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@@ -1268,6 +1295,13 @@ int job_finish_sync_locked(Job *job,
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return -EBUSY;
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}
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+ /* in a sequential transaction jobs with status CREATED can appear at time
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+ * of cancelling, these have not begun work so job_enter won't do anything,
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+ * let's ensure they are marked as ABORTING if required */
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+ if (job->status == JOB_STATUS_CREATED && job->txn->sequential) {
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+ job_update_rc_locked(job);
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+ }
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+
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job_unlock();
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AIO_WAIT_WHILE_UNLOCKED(job->aio_context,
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(job_enter(job), !job_is_completed(job)));
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