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blockjob: add .start field 

Add an explicit start field to specify the entrypoint. We already have
ownership of the coroutine itself AND managing the lifetime of the
coroutine, let's take control of creation of the coroutine, too.

This will allow us to delay creation of the actual coroutine until we
know we'll actually start a BlockJob in block_job_start. This avoids
the sticky question of how to "un-create" a Coroutine that hasn't been
started yet.

Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Message-id: 1478587839-9834-4-git-send-email-jsnow@redhat.com
Signed-off-by: Jeff Cody <jcody@redhat.com>
This commit is contained in:
John Snow 2016-11-08 01:50:36 -05:00 committed by Jeff Cody
parent e8a40bf71d
commit a7815a764c
5 changed files with 23 additions and 15 deletions
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25
block/backup.c
View File

@ -323,17 +323,6 @@ static void backup_drain(BlockJob *job)
}
}
static const BlockJobDriver backup_job_driver = {
.instance_size = sizeof(BackupBlockJob),
.job_type = BLOCK_JOB_TYPE_BACKUP,
.set_speed = backup_set_speed,
.commit = backup_commit,
.abort = backup_abort,
.clean = backup_clean,
.attached_aio_context = backup_attached_aio_context,
.drain = backup_drain,
};
static BlockErrorAction backup_error_action(BackupBlockJob *job,
bool read, int error)
{
@ -542,6 +531,18 @@ static void coroutine_fn backup_run(void *opaque)
block_job_defer_to_main_loop(&job->common, backup_complete, data);
}
static const BlockJobDriver backup_job_driver = {
.instance_size = sizeof(BackupBlockJob),
.job_type = BLOCK_JOB_TYPE_BACKUP,
.start = backup_run,
.set_speed = backup_set_speed,
.commit = backup_commit,
.abort = backup_abort,
.clean = backup_clean,
.attached_aio_context = backup_attached_aio_context,
.drain = backup_drain,
};
void backup_start(const char *job_id, BlockDriverState *bs,
BlockDriverState *target, int64_t speed,
MirrorSyncMode sync_mode, BdrvDirtyBitmap *sync_bitmap,
@ -653,7 +654,7 @@ void backup_start(const char *job_id, BlockDriverState *bs,
block_job_add_bdrv(&job->common, target);
job->common.len = len;
job->common.co = qemu_coroutine_create(backup_run, job);
job->common.co = qemu_coroutine_create(job->common.driver->start, job);
block_job_txn_add_job(txn, &job->common);
qemu_coroutine_enter(job->common.co);
return;

3
block/commit.c
View File

@ -205,6 +205,7 @@ static const BlockJobDriver commit_job_driver = {
.instance_size = sizeof(CommitBlockJob),
.job_type = BLOCK_JOB_TYPE_COMMIT,
.set_speed = commit_set_speed,
.start = commit_run,
};
void commit_start(const char *job_id, BlockDriverState *bs,
@ -288,7 +289,7 @@ void commit_start(const char *job_id, BlockDriverState *bs,
s->backing_file_str = g_strdup(backing_file_str);
s->on_error = on_error;
s->common.co = qemu_coroutine_create(commit_run, s);
s->common.co = qemu_coroutine_create(s->common.driver->start, s);
trace_commit_start(bs, base, top, s, s->common.co);
qemu_coroutine_enter(s->common.co);

4
block/mirror.c
View File

@ -920,6 +920,7 @@ static const BlockJobDriver mirror_job_driver = {
.instance_size = sizeof(MirrorBlockJob),
.job_type = BLOCK_JOB_TYPE_MIRROR,
.set_speed = mirror_set_speed,
.start = mirror_run,
.complete = mirror_complete,
.pause = mirror_pause,
.attached_aio_context = mirror_attached_aio_context,
@ -930,6 +931,7 @@ static const BlockJobDriver commit_active_job_driver = {
.instance_size = sizeof(MirrorBlockJob),
.job_type = BLOCK_JOB_TYPE_COMMIT,
.set_speed = mirror_set_speed,
.start = mirror_run,
.complete = mirror_complete,
.pause = mirror_pause,
.attached_aio_context = mirror_attached_aio_context,
@ -1007,7 +1009,7 @@ static void mirror_start_job(const char *job_id, BlockDriverState *bs,
}
}
s->common.co = qemu_coroutine_create(mirror_run, s);
s->common.co = qemu_coroutine_create(s->common.driver->start, s);
trace_mirror_start(bs, s, s->common.co, opaque);
qemu_coroutine_enter(s->common.co);
}

3
block/stream.c
View File

@ -218,6 +218,7 @@ static const BlockJobDriver stream_job_driver = {
.instance_size = sizeof(StreamBlockJob),
.job_type = BLOCK_JOB_TYPE_STREAM,
.set_speed = stream_set_speed,
.start = stream_run,
};
void stream_start(const char *job_id, BlockDriverState *bs,
@ -254,7 +255,7 @@ void stream_start(const char *job_id, BlockDriverState *bs,
s->bs_flags = orig_bs_flags;
s->on_error = on_error;
s->common.co = qemu_coroutine_create(stream_run, s);
s->common.co = qemu_coroutine_create(s->common.driver->start, s);
trace_stream_start(bs, base, s, s->common.co);
qemu_coroutine_enter(s->common.co);
}

3
include/block/blockjob_int.h
View File

@ -47,6 +47,9 @@ struct BlockJobDriver {
/** Optional callback for job types that need to forward I/O status reset */
void (*iostatus_reset)(BlockJob *job);
/** Mandatory: Entrypoint for the Coroutine. */
CoroutineEntry *start;
/**
* Optional callback for job types whose completion must be triggered
* manually.