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[Qemu-block] [PATCH v3 10/16] mirror: Do initial aio context move of tar
From: |
Fam Zheng |
Subject: |
[Qemu-block] [PATCH v3 10/16] mirror: Do initial aio context move of target via BB interface |
Date: |
Wed, 24 May 2017 10:52:29 +0800 |
While blockdev-backup tried to verify before moving target's aio context, the
same is missing for blockdev-mirror. Now that we have the right interface, fix
this as well.
As a bonus, the aio context move is now conditional, which avoids some
unnecessary operations in bdrv_set_aio_context.
Signed-off-by: Fam Zheng <address@hidden>
---
block/mirror.c | 54 ++++++++++++++++++++++++++++++++----------------------
blockdev.c | 4 ----
2 files changed, 32 insertions(+), 26 deletions(-)
diff --git a/block/mirror.c b/block/mirror.c
index a3337ee..4eccb8d 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -1118,13 +1118,44 @@ static void mirror_start_job(const char *job_id,
BlockDriverState *bs,
bool auto_complete, const char *filter_node_name,
Error **errp)
{
+ AioContext *aio_context, *target_context;
MirrorBlockJob *s;
BlockDriverState *mirror_top_bs;
+ BlockBackend *target_blk;
bool target_graph_mod;
bool target_is_backing;
Error *local_err = NULL;
int ret;
+ /* No resize for the target either; while the mirror is still running, a
+ * consistent read isn't necessarily possible. We could possibly allow
+ * writes and graph modifications, though it would likely defeat the
+ * purpose of a mirror, so leave them blocked for now.
+ *
+ * In the case of active commit, things look a bit different, though,
+ * because the target is an already populated backing file in active use.
+ * We can allow anything except resize there.*/
+ target_is_backing = bdrv_chain_contains(bs, target);
+ target_graph_mod = (backing_mode != MIRROR_LEAVE_BACKING_CHAIN);
+ target_blk = blk_new(BLK_PERM_WRITE | BLK_PERM_RESIZE |
+ BLK_PERM_AIO_CONTEXT_CHANGE |
+ (target_graph_mod ? BLK_PERM_GRAPH_MOD : 0),
+ BLK_PERM_WRITE_UNCHANGED |
+ (target_is_backing ? BLK_PERM_CONSISTENT_READ |
+ BLK_PERM_WRITE |
+ BLK_PERM_GRAPH_MOD : 0));
+ ret = blk_insert_bs(target_blk, target, errp);
+ if (ret < 0) {
+ blk_unref(target_blk);
+ return;
+ }
+ aio_context = bdrv_get_aio_context(bs);
+ target_context = bdrv_get_aio_context(target);
+ if (target_context != aio_context) {
+ aio_context_acquire(target_context);
+ blk_set_aio_context(target_blk, aio_context);
+ aio_context_release(target_context);
+ }
if (granularity == 0) {
granularity = bdrv_get_default_bitmap_granularity(target);
}
@@ -1179,28 +1210,7 @@ static void mirror_start_job(const char *job_id,
BlockDriverState *bs,
s->source = bs;
s->mirror_top_bs = mirror_top_bs;
- /* No resize for the target either; while the mirror is still running, a
- * consistent read isn't necessarily possible. We could possibly allow
- * writes and graph modifications, though it would likely defeat the
- * purpose of a mirror, so leave them blocked for now.
- *
- * In the case of active commit, things look a bit different, though,
- * because the target is an already populated backing file in active use.
- * We can allow anything except resize there.*/
- target_is_backing = bdrv_chain_contains(bs, target);
- target_graph_mod = (backing_mode != MIRROR_LEAVE_BACKING_CHAIN);
- s->target = blk_new(BLK_PERM_WRITE | BLK_PERM_RESIZE |
- BLK_PERM_AIO_CONTEXT_CHANGE |
- (target_graph_mod ? BLK_PERM_GRAPH_MOD : 0),
- BLK_PERM_WRITE_UNCHANGED |
- (target_is_backing ? BLK_PERM_CONSISTENT_READ |
- BLK_PERM_WRITE |
- BLK_PERM_GRAPH_MOD : 0));
- ret = blk_insert_bs(s->target, target, errp);
- if (ret < 0) {
- goto fail;
- }
-
+ s->target = target_blk;
s->replaces = g_strdup(replaces);
s->on_source_error = on_source_error;
s->on_target_error = on_target_error;
diff --git a/blockdev.c b/blockdev.c
index e8f72a1..52d81c4 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -3545,8 +3545,6 @@ void qmp_drive_mirror(DriveMirror *arg, Error **errp)
goto out;
}
- bdrv_set_aio_context(target_bs, aio_context);
-
blockdev_mirror_common(arg->has_job_id ? arg->job_id : NULL, bs, target_bs,
arg->has_replaces, arg->replaces, arg->sync,
backing_mode, arg->has_speed, arg->speed,
@@ -3597,8 +3595,6 @@ void qmp_blockdev_mirror(bool has_job_id, const char
*job_id,
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
- bdrv_set_aio_context(target_bs, aio_context);
-
blockdev_mirror_common(has_job_id ? job_id : NULL, bs, target_bs,
has_replaces, replaces, sync, backing_mode,
has_speed, speed,
--
2.9.4
- [Qemu-block] [PATCH v3 01/16] block: Define BLK_PERM_AIO_CONTEXT_CHANGE, (continued)
- [Qemu-block] [PATCH v3 01/16] block: Define BLK_PERM_AIO_CONTEXT_CHANGE, Fam Zheng, 2017/05/23
- [Qemu-block] [PATCH v3 02/16] block-backend: Add blk_request_perm, Fam Zheng, 2017/05/23
- [Qemu-block] [PATCH v3 03/16] blockjob: Add BLK_PERM_AIO_CONTEXT_CHANGE shared perm on bs, Fam Zheng, 2017/05/23
- [Qemu-block] [PATCH v3 04/16] blockjob: Allow aio context change on intermediate nodes, Fam Zheng, 2017/05/23
- [Qemu-block] [PATCH v3 05/16] block: Propagate BLK_PERM_AIO_CONTEXT_CHANGE down the graph, Fam Zheng, 2017/05/23
- [Qemu-block] [PATCH v3 06/16] backup: Request BLK_PERM_AIO_CONTEXT_CHANGE on target, Fam Zheng, 2017/05/23
- [Qemu-block] [PATCH v3 07/16] backup: Do initial aio context move of target via BB interface, Fam Zheng, 2017/05/23
- [Qemu-block] [PATCH v3 08/16] mirror: Request aio context change permission on target, Fam Zheng, 2017/05/23
- [Qemu-block] [PATCH v3 09/16] commit: Allow aio context change on s->base, Fam Zheng, 2017/05/23
- [Qemu-block] [PATCH v3 10/16] mirror: Do initial aio context move of target via BB interface,
Fam Zheng <=
- [Qemu-block] [PATCH v3 11/16] virtio-scsi: Request BLK_PERM_AIO_CONTEXT_CHANGE for dataplane, Fam Zheng, 2017/05/23
- [Qemu-block] [PATCH v3 12/16] virtio-blk: Request BLK_PERM_AIO_CONTEXT_CHANGE for dataplane, Fam Zheng, 2017/05/23
- [Qemu-block] [PATCH v3 13/16] blk: fix aio context loss on media change, Fam Zheng, 2017/05/23
- [Qemu-block] [PATCH v3 14/16] nbd: Allow BLK_PERM_AIO_CONTEXT_CHANGE on BB, Fam Zheng, 2017/05/23
- [Qemu-block] [PATCH v3 15/16] block: Add perm assertion on blk_set_aio_context, Fam Zheng, 2017/05/23
- [Qemu-block] [PATCH v3 16/16] tests: Add test case for BLK_PERM_AIO_CONTEXT_CHANGE, Fam Zheng, 2017/05/23
- Re: [Qemu-block] [PATCH v3 00/16] block: Protect AIO context change with perm API, Stefan Hajnoczi, 2017/05/31