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authorKevin Wolf <kwolf@redhat.com>2016-04-08 14:51:09 +0200
committerKevin Wolf <kwolf@redhat.com>2016-05-25 19:04:21 +0200
commitb6d2e59995fa82c7fe469d47dfc22cf9bf2f8a5e (patch)
tree4c4b068514226799720a463ebee7016a592285e2 /blockjob.c
parent0c3169dffa68fcdc71ad42e9a60faa4778de0397 (diff)
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block: Convert block job core to BlockBackend
This adds a new BlockBackend field to the BlockJob struct, which coexists with the BlockDriverState while converting the individual jobs. When creating a block job, a new BlockBackend is created on top of the given BlockDriverState, and it is destroyed when the BlockJob ends. The reference to the BDS is now held by the BlockBackend instead of calling bdrv_ref/unref manually. We have to be careful when we use bdrv_replace_in_backing_chain() in block jobs because this changes the BDS that job->blk points to. At the moment block jobs are too tightly coupled with their BDS, so that moving a job to another BDS isn't easily possible; therefore, we need to just manually undo this change afterwards. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Alberto Garcia <berto@igalia.com> Reviewed-by: Max Reitz <mreitz@redhat.com>
Diffstat (limited to 'blockjob.c')
-rw-r--r--blockjob.c37
1 files changed, 20 insertions, 17 deletions
diff --git a/blockjob.c b/blockjob.c
index e916b41..2097e1d 100644
--- a/blockjob.c
+++ b/blockjob.c
@@ -64,13 +64,17 @@ void *block_job_create(const BlockJobDriver *driver, BlockDriverState *bs,
int64_t speed, BlockCompletionFunc *cb,
void *opaque, Error **errp)
{
+ BlockBackend *blk;
BlockJob *job;
if (bs->job) {
error_setg(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs));
return NULL;
}
- bdrv_ref(bs);
+
+ blk = blk_new();
+ blk_insert_bs(blk, bs);
+
job = g_malloc0(driver->instance_size);
error_setg(&job->blocker, "block device is in use by block job: %s",
BlockJobType_lookup[driver->job_type]);
@@ -80,6 +84,7 @@ void *block_job_create(const BlockJobDriver *driver, BlockDriverState *bs,
job->driver = driver;
job->id = g_strdup(bdrv_get_device_name(bs));
job->bs = bs;
+ job->blk = blk;
job->cb = cb;
job->opaque = opaque;
job->busy = true;
@@ -110,9 +115,10 @@ void block_job_ref(BlockJob *job)
void block_job_unref(BlockJob *job)
{
if (--job->refcnt == 0) {
- job->bs->job = NULL;
- bdrv_op_unblock_all(job->bs, job->blocker);
- bdrv_unref(job->bs);
+ BlockDriverState *bs = blk_bs(job->blk);
+ bs->job = NULL;
+ bdrv_op_unblock_all(bs, job->blocker);
+ blk_unref(job->blk);
error_free(job->blocker);
g_free(job->id);
QLIST_REMOVE(job, job_list);
@@ -153,7 +159,7 @@ static void block_job_completed_txn_abort(BlockJob *job)
txn->aborting = true;
/* We are the first failed job. Cancel other jobs. */
QLIST_FOREACH(other_job, &txn->jobs, txn_list) {
- ctx = bdrv_get_aio_context(other_job->bs);
+ ctx = blk_get_aio_context(other_job->blk);
aio_context_acquire(ctx);
}
QLIST_FOREACH(other_job, &txn->jobs, txn_list) {
@@ -170,7 +176,7 @@ static void block_job_completed_txn_abort(BlockJob *job)
assert(other_job->completed);
}
QLIST_FOREACH_SAFE(other_job, &txn->jobs, txn_list, next) {
- ctx = bdrv_get_aio_context(other_job->bs);
+ ctx = blk_get_aio_context(other_job->blk);
block_job_completed_single(other_job);
aio_context_release(ctx);
}
@@ -192,7 +198,7 @@ static void block_job_completed_txn_success(BlockJob *job)
}
/* We are the last completed job, commit the transaction. */
QLIST_FOREACH_SAFE(other_job, &txn->jobs, txn_list, next) {
- ctx = bdrv_get_aio_context(other_job->bs);
+ ctx = blk_get_aio_context(other_job->blk);
aio_context_acquire(ctx);
assert(other_job->ret == 0);
block_job_completed_single(other_job);
@@ -202,9 +208,7 @@ static void block_job_completed_txn_success(BlockJob *job)
void block_job_completed(BlockJob *job, int ret)
{
- BlockDriverState *bs = job->bs;
-
- assert(bs->job == job);
+ assert(blk_bs(job->blk)->job == job);
assert(!job->completed);
job->completed = true;
job->ret = ret;
@@ -295,11 +299,10 @@ static int block_job_finish_sync(BlockJob *job,
void (*finish)(BlockJob *, Error **errp),
Error **errp)
{
- BlockDriverState *bs = job->bs;
Error *local_err = NULL;
int ret;
- assert(bs->job == job);
+ assert(blk_bs(job->blk)->job == job);
block_job_ref(job);
finish(job, &local_err);
@@ -310,7 +313,7 @@ static int block_job_finish_sync(BlockJob *job,
}
while (!job->completed) {
aio_poll(job->deferred_to_main_loop ? qemu_get_aio_context() :
- bdrv_get_aio_context(bs),
+ blk_get_aio_context(job->blk),
true);
}
ret = (job->cancelled && job->ret == 0) ? -ECANCELED : job->ret;
@@ -337,7 +340,7 @@ void block_job_cancel_sync_all(void)
AioContext *aio_context;
while ((job = QLIST_FIRST(&block_jobs))) {
- aio_context = bdrv_get_aio_context(job->bs);
+ aio_context = blk_get_aio_context(job->blk);
aio_context_acquire(aio_context);
block_job_cancel_sync(job);
aio_context_release(aio_context);
@@ -362,7 +365,7 @@ void block_job_sleep_ns(BlockJob *job, QEMUClockType type, int64_t ns)
if (block_job_is_paused(job)) {
qemu_coroutine_yield();
} else {
- co_aio_sleep_ns(bdrv_get_aio_context(job->bs), type, ns);
+ co_aio_sleep_ns(blk_get_aio_context(job->blk), type, ns);
}
job->busy = true;
}
@@ -491,7 +494,7 @@ static void block_job_defer_to_main_loop_bh(void *opaque)
aio_context_acquire(data->aio_context);
/* Fetch BDS AioContext again, in case it has changed */
- aio_context = bdrv_get_aio_context(data->job->bs);
+ aio_context = blk_get_aio_context(data->job->blk);
aio_context_acquire(aio_context);
data->job->deferred_to_main_loop = false;
@@ -511,7 +514,7 @@ void block_job_defer_to_main_loop(BlockJob *job,
BlockJobDeferToMainLoopData *data = g_malloc(sizeof(*data));
data->job = job;
data->bh = qemu_bh_new(block_job_defer_to_main_loop_bh, data);
- data->aio_context = bdrv_get_aio_context(job->bs);
+ data->aio_context = blk_get_aio_context(job->blk);
data->fn = fn;
data->opaque = opaque;
job->deferred_to_main_loop = true;