2018-11-08 17:02:33 +00:00
|
|
|
From 430c298d6bf9a7c8b90ad30bc2cd445e5cd6dd50 Mon Sep 17 00:00:00 2001
|
2018-10-14 17:48:54 +00:00
|
|
|
From: John Snow <jsnow@redhat.com>
|
|
|
|
Date: Thu, 6 Sep 2018 09:02:15 -0400
|
|
|
|
Subject: block/mirror: conservative mirror_exit refactor
|
|
|
|
|
|
|
|
RH-Author: John Snow <jsnow@redhat.com>
|
|
|
|
Message-id: <20180925223431.24791-16-jsnow@redhat.com>
|
|
|
|
Patchwork-id: 82270
|
|
|
|
O-Subject: [RHEL8/rhel qemu-kvm PATCH 15/25] block/mirror: conservative mirr
|
|
|
|
Bugzilla: 1632939
|
|
|
|
RH-Acked-by: Jeffrey Cody <jcody@redhat.com>
|
|
|
|
RH-Acked-by: Max Reitz <mreitz@redhat.com>
|
|
|
|
RH-Acked-by: Kevin Wolf <kwolf@redhat.com>
|
|
|
|
|
|
|
|
For purposes of minimum code movement, refactor the mirror_exit
|
|
|
|
callback to use the post-finalization callbacks in a trivial way.
|
|
|
|
|
|
|
|
Signed-off-by: John Snow <jsnow@redhat.com>
|
|
|
|
Message-id: 20180906130225.5118-7-jsnow@redhat.com
|
|
|
|
Reviewed-by: Jeff Cody <jcody@redhat.com>
|
|
|
|
Reviewed-by: Max Reitz <mreitz@redhat.com>
|
|
|
|
[mreitz: Added comment for the mirror_exit() function]
|
|
|
|
Signed-off-by: Max Reitz <mreitz@redhat.com>
|
|
|
|
(cherry picked from commit 737efc1eda23b904fbe0e66b37715fb0e5c3e58b)
|
|
|
|
Signed-off-by: John Snow <jsnow@redhat.com>
|
|
|
|
---
|
|
|
|
block/mirror.c | 44 +++++++++++++++++++++++++++++++++-----------
|
|
|
|
1 file changed, 33 insertions(+), 11 deletions(-)
|
|
|
|
|
|
|
|
diff --git a/block/mirror.c b/block/mirror.c
|
|
|
|
index 19b57b8..7efba77 100644
|
|
|
|
--- a/block/mirror.c
|
|
|
|
+++ b/block/mirror.c
|
|
|
|
@@ -79,6 +79,7 @@ typedef struct MirrorBlockJob {
|
|
|
|
int max_iov;
|
|
|
|
bool initial_zeroing_ongoing;
|
|
|
|
int in_active_write_counter;
|
|
|
|
+ bool prepared;
|
|
|
|
} MirrorBlockJob;
|
|
|
|
|
|
|
|
typedef struct MirrorBDSOpaque {
|
|
|
|
@@ -607,7 +608,12 @@ static void mirror_wait_for_all_io(MirrorBlockJob *s)
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
-static void mirror_exit(Job *job)
|
|
|
|
+/**
|
|
|
|
+ * mirror_exit_common: handle both abort() and prepare() cases.
|
|
|
|
+ * for .prepare, returns 0 on success and -errno on failure.
|
|
|
|
+ * for .abort cases, denoted by abort = true, MUST return 0.
|
|
|
|
+ */
|
|
|
|
+static int mirror_exit_common(Job *job)
|
|
|
|
{
|
|
|
|
MirrorBlockJob *s = container_of(job, MirrorBlockJob, common.job);
|
|
|
|
BlockJob *bjob = &s->common;
|
|
|
|
@@ -617,7 +623,13 @@ static void mirror_exit(Job *job)
|
|
|
|
BlockDriverState *target_bs = blk_bs(s->target);
|
|
|
|
BlockDriverState *mirror_top_bs = s->mirror_top_bs;
|
|
|
|
Error *local_err = NULL;
|
|
|
|
- int ret = job->ret;
|
|
|
|
+ bool abort = job->ret < 0;
|
|
|
|
+ int ret = 0;
|
|
|
|
+
|
|
|
|
+ if (s->prepared) {
|
|
|
|
+ return 0;
|
|
|
|
+ }
|
|
|
|
+ s->prepared = true;
|
|
|
|
|
|
|
|
bdrv_release_dirty_bitmap(src, s->dirty_bitmap);
|
|
|
|
|
|
|
|
@@ -642,7 +654,7 @@ static void mirror_exit(Job *job)
|
|
|
|
* required before it could become a backing file of target_bs. */
|
|
|
|
bdrv_child_try_set_perm(mirror_top_bs->backing, 0, BLK_PERM_ALL,
|
|
|
|
&error_abort);
|
|
|
|
- if (ret == 0 && s->backing_mode == MIRROR_SOURCE_BACKING_CHAIN) {
|
|
|
|
+ if (!abort && s->backing_mode == MIRROR_SOURCE_BACKING_CHAIN) {
|
|
|
|
BlockDriverState *backing = s->is_none_mode ? src : s->base;
|
|
|
|
if (backing_bs(target_bs) != backing) {
|
|
|
|
bdrv_set_backing_hd(target_bs, backing, &local_err);
|
|
|
|
@@ -658,11 +670,8 @@ static void mirror_exit(Job *job)
|
|
|
|
aio_context_acquire(replace_aio_context);
|
|
|
|
}
|
|
|
|
|
|
|
|
- if (s->should_complete && ret == 0) {
|
|
|
|
- BlockDriverState *to_replace = src;
|
|
|
|
- if (s->to_replace) {
|
|
|
|
- to_replace = s->to_replace;
|
|
|
|
- }
|
|
|
|
+ if (s->should_complete && !abort) {
|
|
|
|
+ BlockDriverState *to_replace = s->to_replace ?: src;
|
|
|
|
|
|
|
|
if (bdrv_get_flags(target_bs) != bdrv_get_flags(to_replace)) {
|
|
|
|
bdrv_reopen(target_bs, bdrv_get_flags(to_replace), NULL);
|
|
|
|
@@ -711,7 +720,18 @@ static void mirror_exit(Job *job)
|
|
|
|
bdrv_unref(mirror_top_bs);
|
|
|
|
bdrv_unref(src);
|
|
|
|
|
|
|
|
- job->ret = ret;
|
|
|
|
+ return ret;
|
|
|
|
+}
|
|
|
|
+
|
|
|
|
+static int mirror_prepare(Job *job)
|
|
|
|
+{
|
|
|
|
+ return mirror_exit_common(job);
|
|
|
|
+}
|
|
|
|
+
|
|
|
|
+static void mirror_abort(Job *job)
|
|
|
|
+{
|
|
|
|
+ int ret = mirror_exit_common(job);
|
|
|
|
+ assert(ret == 0);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void mirror_throttle(MirrorBlockJob *s)
|
|
|
|
@@ -1132,7 +1152,8 @@ static const BlockJobDriver mirror_job_driver = {
|
|
|
|
.user_resume = block_job_user_resume,
|
|
|
|
.drain = block_job_drain,
|
|
|
|
.run = mirror_run,
|
|
|
|
- .exit = mirror_exit,
|
|
|
|
+ .prepare = mirror_prepare,
|
|
|
|
+ .abort = mirror_abort,
|
|
|
|
.pause = mirror_pause,
|
|
|
|
.complete = mirror_complete,
|
|
|
|
},
|
|
|
|
@@ -1149,7 +1170,8 @@ static const BlockJobDriver commit_active_job_driver = {
|
|
|
|
.user_resume = block_job_user_resume,
|
|
|
|
.drain = block_job_drain,
|
|
|
|
.run = mirror_run,
|
|
|
|
- .exit = mirror_exit,
|
|
|
|
+ .prepare = mirror_prepare,
|
|
|
|
+ .abort = mirror_abort,
|
|
|
|
.pause = mirror_pause,
|
|
|
|
.complete = mirror_complete,
|
|
|
|
},
|
|
|
|
--
|
|
|
|
1.8.3.1
|
|
|
|
|