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authorKevin Wolf <kwolf@redhat.com>2015-09-16 13:34:54 +0200
committerKevin Wolf <kwolf@redhat.com>2015-10-16 15:34:30 +0200
commit8ccb9569a976056c9594bb720ba33d84827648d9 (patch)
tree9f7114320fd8728d8164ad92efa425a1a3af246d
parentdd62f1ca433ea60b06590884642ad2c8f8e539f2 (diff)
blockjob: Store device name at job creation
Some block jobs change the block device graph on completion. This means that the device that owns the job and originally was addressed with its device name may no longer be what the corresponding BlockBackend points to. Previously, the effects of bdrv_swap() ensured that the job was (at least partially) transferred to the target image. Events that contain the device name could still use bdrv_get_device_name(job->bs) and get the same result. After removing bdrv_swap(), this won't work any more. Instead, save the device name at job creation and use that copy for QMP events and anything else identifying the job. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Alberto Garcia <berto@igalia.com> Reviewed-by: Fam Zheng <famz@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
-rw-r--r--block/mirror.c3
-rw-r--r--blockjob.c15
-rw-r--r--include/block/blockjob.h8
3 files changed, 17 insertions, 9 deletions
diff --git a/block/mirror.c b/block/mirror.c
index 6247b27612..c277691e4d 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -645,8 +645,7 @@ static void mirror_complete(BlockJob *job, Error **errp)
return;
}
if (!s->synced) {
- error_setg(errp, QERR_BLOCK_JOB_NOT_READY,
- bdrv_get_device_name(job->bs));
+ error_setg(errp, QERR_BLOCK_JOB_NOT_READY, job->id);
return;
}
diff --git a/blockjob.c b/blockjob.c
index 62bb906634..d87869c24a 100644
--- a/blockjob.c
+++ b/blockjob.c
@@ -54,6 +54,7 @@ void *block_job_create(const BlockJobDriver *driver, BlockDriverState *bs,
bdrv_op_unblock(bs, BLOCK_OP_TYPE_DATAPLANE, job->blocker);
job->driver = driver;
+ job->id = g_strdup(bdrv_get_device_name(bs));
job->bs = bs;
job->cb = cb;
job->opaque = opaque;
@@ -81,6 +82,7 @@ void block_job_release(BlockDriverState *bs)
bs->job = NULL;
bdrv_op_unblock_all(bs, job->blocker);
error_free(job->blocker);
+ g_free(job->id);
g_free(job);
}
@@ -113,8 +115,7 @@ void block_job_set_speed(BlockJob *job, int64_t speed, Error **errp)
void block_job_complete(BlockJob *job, Error **errp)
{
if (job->pause_count || job->cancelled || !job->driver->complete) {
- error_setg(errp, QERR_BLOCK_JOB_NOT_READY,
- bdrv_get_device_name(job->bs));
+ error_setg(errp, QERR_BLOCK_JOB_NOT_READY, job->id);
return;
}
@@ -269,7 +270,7 @@ BlockJobInfo *block_job_query(BlockJob *job)
{
BlockJobInfo *info = g_new0(BlockJobInfo, 1);
info->type = g_strdup(BlockJobType_lookup[job->driver->job_type]);
- info->device = g_strdup(bdrv_get_device_name(job->bs));
+ info->device = g_strdup(job->id);
info->len = job->len;
info->busy = job->busy;
info->paused = job->pause_count > 0;
@@ -291,7 +292,7 @@ static void block_job_iostatus_set_err(BlockJob *job, int error)
void block_job_event_cancelled(BlockJob *job)
{
qapi_event_send_block_job_cancelled(job->driver->job_type,
- bdrv_get_device_name(job->bs),
+ job->id,
job->len,
job->offset,
job->speed,
@@ -301,7 +302,7 @@ void block_job_event_cancelled(BlockJob *job)
void block_job_event_completed(BlockJob *job, const char *msg)
{
qapi_event_send_block_job_completed(job->driver->job_type,
- bdrv_get_device_name(job->bs),
+ job->id,
job->len,
job->offset,
job->speed,
@@ -315,7 +316,7 @@ void block_job_event_ready(BlockJob *job)
job->ready = true;
qapi_event_send_block_job_ready(job->driver->job_type,
- bdrv_get_device_name(job->bs),
+ job->id,
job->len,
job->offset,
job->speed, &error_abort);
@@ -344,7 +345,7 @@ BlockErrorAction block_job_error_action(BlockJob *job, BlockDriverState *bs,
default:
abort();
}
- qapi_event_send_block_job_error(bdrv_get_device_name(job->bs),
+ qapi_event_send_block_job_error(job->id,
is_read ? IO_OPERATION_TYPE_READ :
IO_OPERATION_TYPE_WRITE,
action, &error_abort);
diff --git a/include/block/blockjob.h b/include/block/blockjob.h
index dd9d5e6aad..289b13f0c0 100644
--- a/include/block/blockjob.h
+++ b/include/block/blockjob.h
@@ -65,6 +65,14 @@ struct BlockJob {
BlockDriverState *bs;
/**
+ * The ID of the block job. Currently the BlockBackend name of the BDS
+ * owning the job at the time when the job is started.
+ *
+ * TODO Decouple block job IDs from BlockBackend names
+ */
+ char *id;
+
+ /**
* The coroutine that executes the job. If not NULL, it is
* reentered when busy is false and the job is cancelled.
*/