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[Qemu-devel] [PULL 49/53] block: let backup blockjob run in BDS AioConte
From: |
Stefan Hajnoczi |
Subject: |
[Qemu-devel] [PULL 49/53] block: let backup blockjob run in BDS AioContext |
Date: |
Mon, 3 Nov 2014 11:50:52 +0000 |
The backup block job must run in the BlockDriverState AioContext so that
it works with dataplane.
The basics of acquiring the AioContext are easy in blockdev.c.
The completion code in block/backup.c must call bdrv_unref() from the
main loop. Use block_job_defer_to_main_loop() to achieve that.
Signed-off-by: Stefan Hajnoczi <address@hidden>
Reviewed-by: Max Reitz <address@hidden>
Message-id: address@hidden
---
block/backup.c | 21 +++++++++++++++++++--
blockdev.c | 23 ++++++++++++++++-------
2 files changed, 35 insertions(+), 9 deletions(-)
diff --git a/block/backup.c b/block/backup.c
index e334740..792e655 100644
--- a/block/backup.c
+++ b/block/backup.c
@@ -227,9 +227,25 @@ static BlockErrorAction backup_error_action(BackupBlockJob
*job,
}
}
+typedef struct {
+ int ret;
+} BackupCompleteData;
+
+static void backup_complete(BlockJob *job, void *opaque)
+{
+ BackupBlockJob *s = container_of(job, BackupBlockJob, common);
+ BackupCompleteData *data = opaque;
+
+ bdrv_unref(s->target);
+
+ block_job_completed(job, data->ret);
+ g_free(data);
+}
+
static void coroutine_fn backup_run(void *opaque)
{
BackupBlockJob *job = opaque;
+ BackupCompleteData *data;
BlockDriverState *bs = job->common.bs;
BlockDriverState *target = job->target;
BlockdevOnError on_target_error = job->on_target_error;
@@ -344,9 +360,10 @@ static void coroutine_fn backup_run(void *opaque)
hbitmap_free(job->bitmap);
bdrv_iostatus_disable(target);
- bdrv_unref(target);
- block_job_completed(&job->common, ret);
+ data = g_malloc(sizeof(*data));
+ data->ret = ret;
+ block_job_defer_to_main_loop(&job->common, backup_complete, data);
}
void backup_start(BlockDriverState *bs, BlockDriverState *target,
diff --git a/blockdev.c b/blockdev.c
index 774051b..9c68988 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -2108,6 +2108,7 @@ void qmp_drive_backup(const char *device, const char
*target,
BlockDriverState *bs;
BlockDriverState *target_bs;
BlockDriverState *source = NULL;
+ AioContext *aio_context;
BlockDriver *drv = NULL;
Error *local_err = NULL;
int flags;
@@ -2133,9 +2134,12 @@ void qmp_drive_backup(const char *device, const char
*target,
return;
}
+ aio_context = bdrv_get_aio_context(bs);
+ aio_context_acquire(aio_context);
+
if (!bdrv_is_inserted(bs)) {
error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
- return;
+ goto out;
}
if (!has_format) {
@@ -2145,12 +2149,12 @@ void qmp_drive_backup(const char *device, const char
*target,
drv = bdrv_find_format(format);
if (!drv) {
error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
- return;
+ goto out;
}
}
if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) {
- return;
+ goto out;
}
flags = bs->open_flags | BDRV_O_RDWR;
@@ -2170,7 +2174,7 @@ void qmp_drive_backup(const char *device, const char
*target,
size = bdrv_getlength(bs);
if (size < 0) {
error_setg_errno(errp, -size, "bdrv_getlength failed");
- return;
+ goto out;
}
if (mode != NEW_IMAGE_MODE_EXISTING) {
@@ -2187,23 +2191,28 @@ void qmp_drive_backup(const char *device, const char
*target,
if (local_err) {
error_propagate(errp, local_err);
- return;
+ goto out;
}
target_bs = NULL;
ret = bdrv_open(&target_bs, target, NULL, NULL, flags, drv, &local_err);
if (ret < 0) {
error_propagate(errp, local_err);
- return;
+ goto out;
}
+ bdrv_set_aio_context(target_bs, aio_context);
+
backup_start(bs, target_bs, speed, sync, on_source_error, on_target_error,
block_job_cb, bs, &local_err);
if (local_err != NULL) {
bdrv_unref(target_bs);
error_propagate(errp, local_err);
- return;
+ goto out;
}
+
+out:
+ aio_context_release(aio_context);
}
BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp)
--
1.9.3
- [Qemu-devel] [PULL 39/53] block/qcow2: Implement status CB for amend, (continued)
- [Qemu-devel] [PULL 39/53] block/qcow2: Implement status CB for amend, Stefan Hajnoczi, 2014/11/03
- [Qemu-devel] [PULL 40/53] block/qcow2: Make get_refcount() global, Stefan Hajnoczi, 2014/11/03
- [Qemu-devel] [PULL 41/53] block/qcow2: Simplify shared L2 handling in amend, Stefan Hajnoczi, 2014/11/03
- [Qemu-devel] [PULL 42/53] iotests: Expand test 061, Stefan Hajnoczi, 2014/11/03
- [Qemu-devel] [PULL 43/53] block: acquire AioContext in generic blockjob QMP commands, Stefan Hajnoczi, 2014/11/03
- [Qemu-devel] [PULL 44/53] blockdev: acquire AioContext in do_qmp_query_block_jobs_one(), Stefan Hajnoczi, 2014/11/03
- [Qemu-devel] [PULL 45/53] blockdev: acquire AioContext in blockdev_mark_auto_del(), Stefan Hajnoczi, 2014/11/03
- [Qemu-devel] [PULL 46/53] blockdev: add note that block_job_cb() must be thread-safe, Stefan Hajnoczi, 2014/11/03
- [Qemu-devel] [PULL 47/53] blockjob: add block_job_defer_to_main_loop(), Stefan Hajnoczi, 2014/11/03
- [Qemu-devel] [PULL 48/53] block: add bdrv_drain(), Stefan Hajnoczi, 2014/11/03
- [Qemu-devel] [PULL 49/53] block: let backup blockjob run in BDS AioContext,
Stefan Hajnoczi <=
- [Qemu-devel] [PULL 50/53] block: let stream blockjob run in BDS AioContext, Stefan Hajnoczi, 2014/11/03
- [Qemu-devel] [PULL 52/53] block: let commit blockjob run in BDS AioContext, Stefan Hajnoczi, 2014/11/03
- [Qemu-devel] [PULL 53/53] block: declare blockjobs and dataplane friends!, Stefan Hajnoczi, 2014/11/03
- [Qemu-devel] [PULL 51/53] block: let mirror blockjob run in BDS AioContext, Stefan Hajnoczi, 2014/11/03
- Re: [Qemu-devel] [PULL 00/53] Block patches, Peter Maydell, 2014/11/03