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[Qemu-block] [PATCH v2 5/5] blockjob: add Job parameter to BlockCompleti
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From: |
John Snow |
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Subject: |
[Qemu-block] [PATCH v2 5/5] blockjob: add Job parameter to BlockCompletionFunc |
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Date: |
Tue, 26 Jan 2016 18:54:59 -0500 |
It will no longer be sufficient to rely on the opaque parameter
containing a BDS, and there's no way to reliably include a
self-reference to the job we're creating, so always pass the Job
object forward to any callbacks.
Signed-off-by: John Snow <address@hidden>
---
block/backup.c | 2 +-
block/commit.c | 2 +-
block/mirror.c | 6 +++---
block/stream.c | 2 +-
blockdev.c | 14 +++++---------
blockjob.c | 13 +++++++++++--
include/block/block.h | 2 ++
include/block/block_int.h | 10 +++++-----
include/block/blockjob.h | 6 ++++--
qemu-img.c | 4 ++--
tests/test-blockjob-txn.c | 4 ++--
11 files changed, 37 insertions(+), 28 deletions(-)
diff --git a/block/backup.c b/block/backup.c
index 735cbe6..dd7e532 100644
--- a/block/backup.c
+++ b/block/backup.c
@@ -492,7 +492,7 @@ BlockJob *backup_start(BlockDriverState *bs,
BlockDriverState *target,
BdrvDirtyBitmap *sync_bitmap,
BlockdevOnError on_source_error,
BlockdevOnError on_target_error,
- BlockCompletionFunc *cb, void *opaque,
+ BlockJobCompletionFunc *cb, void *opaque,
BlockJobTxn *txn, Error **errp)
{
int64_t len;
diff --git a/block/commit.c b/block/commit.c
index 446a3ae..aca4b84 100644
--- a/block/commit.c
+++ b/block/commit.c
@@ -203,7 +203,7 @@ static const BlockJobDriver commit_job_driver = {
void commit_start(BlockDriverState *bs, BlockDriverState *base,
BlockDriverState *top, int64_t speed,
- BlockdevOnError on_error, BlockCompletionFunc *cb,
+ BlockdevOnError on_error, BlockJobCompletionFunc *cb,
void *opaque, const char *backing_file_str, Error **errp)
{
CommitBlockJob *s;
diff --git a/block/mirror.c b/block/mirror.c
index b193e36..8016834 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -715,7 +715,7 @@ static BlockJob *mirror_start_job(BlockDriverState *bs,
BlockdevOnError on_source_error,
BlockdevOnError on_target_error,
bool unmap,
- BlockCompletionFunc *cb,
+ BlockJobCompletionFunc *cb,
void *opaque, Error **errp,
const BlockJobDriver *driver,
bool is_none_mode, BlockDriverState *base)
@@ -802,7 +802,7 @@ void mirror_start(BlockDriverState *bs, BlockDriverState
*target,
MirrorSyncMode mode, BlockdevOnError on_source_error,
BlockdevOnError on_target_error,
bool unmap,
- BlockCompletionFunc *cb,
+ BlockJobCompletionFunc *cb,
void *opaque, Error **errp)
{
bool is_none_mode;
@@ -827,7 +827,7 @@ void mirror_start(BlockDriverState *bs, BlockDriverState
*target,
BlockJob *commit_active_start(BlockDriverState *bs, BlockDriverState *base,
int64_t speed,
BlockdevOnError on_error,
- BlockCompletionFunc *cb,
+ BlockJobCompletionFunc *cb,
void *opaque, Error **errp)
{
int64_t length, base_length;
diff --git a/block/stream.c b/block/stream.c
index 26a2990..0c8ae20 100644
--- a/block/stream.c
+++ b/block/stream.c
@@ -217,7 +217,7 @@ static const BlockJobDriver stream_job_driver = {
BlockJob *stream_start(BlockDriverState *bs, BlockDriverState *base,
const char *backing_file_str, int64_t speed,
BlockdevOnError on_error,
- BlockCompletionFunc *cb,
+ BlockJobCompletionFunc *cb,
void *opaque, Error **errp)
{
StreamBlockJob *s;
diff --git a/blockdev.c b/blockdev.c
index ad46aa8..9851405 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -2854,28 +2854,24 @@ out:
aio_context_release(aio_context);
}
-static void block_job_cb(void *opaque, int ret)
+static void block_job_cb(BlockJob *job, int ret)
{
/* Note that this function may be executed from another AioContext besides
* the QEMU main loop. If you need to access anything that assumes the
* QEMU global mutex, use a BH or introduce a mutex.
*/
-
- BlockDriverState *bs = opaque;
const char *msg = NULL;
- trace_block_job_cb(bs, bs->job, ret);
-
- assert(bs->job);
+ trace_block_job_cb(job->bs, job, ret);
if (ret < 0) {
msg = strerror(-ret);
}
- if (block_job_is_cancelled(bs->job)) {
- block_job_event_cancelled(bs->job);
+ if (block_job_is_cancelled(job)) {
+ block_job_event_cancelled(job);
} else {
- block_job_event_completed(bs->job, msg);
+ block_job_event_completed(job, msg);
}
}
diff --git a/blockjob.c b/blockjob.c
index 80adb9d..fe6873c 100644
--- a/blockjob.c
+++ b/blockjob.c
@@ -51,7 +51,7 @@ struct BlockJobTxn {
};
void *block_job_create(const BlockJobDriver *driver, BlockDriverState *bs,
- int64_t speed, BlockCompletionFunc *cb,
+ int64_t speed, BlockJobCompletionFunc *cb,
void *opaque, Error **errp)
{
BlockJob *job;
@@ -90,6 +90,15 @@ void *block_job_create(const BlockJobDriver *driver,
BlockDriverState *bs,
return job;
}
+/**
+ * For generic callbacks to retrieve the data they submitted
+ * during callback registration.
+ */
+void *block_job_data(BlockJob *job)
+{
+ return job->opaque;
+}
+
void block_job_ref(BlockJob *job)
{
++job->refcnt;
@@ -118,7 +127,7 @@ static void block_job_completed_single(BlockJob *job)
job->driver->abort(job);
}
}
- job->cb(job->opaque, job->ret);
+ job->cb(job, job->ret);
if (job->txn) {
block_job_txn_unref(job->txn);
}
diff --git a/include/block/block.h b/include/block/block.h
index 25f36dc..ed6f2ee 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -16,6 +16,8 @@ typedef struct BdrvChild BdrvChild;
typedef struct BdrvChildRole BdrvChildRole;
typedef struct BlockJobTxn BlockJobTxn;
+typedef void BlockJobCompletionFunc(BlockJob *job, int ret);
+
typedef struct BlockDriverInfo {
/* in bytes, 0 if irrelevant */
int cluster_size;
diff --git a/include/block/block_int.h b/include/block/block_int.h
index 9a5cc39..271e922 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -601,7 +601,7 @@ int is_windows_drive(const char *filename);
BlockJob *stream_start(BlockDriverState *bs, BlockDriverState *base,
const char *base_id, int64_t speed,
BlockdevOnError on_error,
- BlockCompletionFunc *cb,
+ BlockJobCompletionFunc *cb,
void *opaque, Error **errp);
/**
@@ -619,7 +619,7 @@ BlockJob *stream_start(BlockDriverState *bs,
BlockDriverState *base,
*/
void commit_start(BlockDriverState *bs, BlockDriverState *base,
BlockDriverState *top, int64_t speed,
- BlockdevOnError on_error, BlockCompletionFunc *cb,
+ BlockdevOnError on_error, BlockJobCompletionFunc *cb,
void *opaque, const char *backing_file_str, Error **errp);
/**
* commit_active_start:
@@ -635,7 +635,7 @@ void commit_start(BlockDriverState *bs, BlockDriverState
*base,
BlockJob *commit_active_start(BlockDriverState *bs, BlockDriverState *base,
int64_t speed,
BlockdevOnError on_error,
- BlockCompletionFunc *cb,
+ BlockJobCompletionFunc *cb,
void *opaque, Error **errp);
/*
* mirror_start:
@@ -665,7 +665,7 @@ void mirror_start(BlockDriverState *bs, BlockDriverState
*target,
MirrorSyncMode mode, BlockdevOnError on_source_error,
BlockdevOnError on_target_error,
bool unmap,
- BlockCompletionFunc *cb,
+ BlockJobCompletionFunc *cb,
void *opaque, Error **errp);
/*
@@ -689,7 +689,7 @@ BlockJob *backup_start(BlockDriverState *bs,
BlockDriverState *target,
BdrvDirtyBitmap *sync_bitmap,
BlockdevOnError on_source_error,
BlockdevOnError on_target_error,
- BlockCompletionFunc *cb, void *opaque,
+ BlockJobCompletionFunc *cb, void *opaque,
BlockJobTxn *txn, Error **errp);
void blk_set_bs(BlockBackend *blk, BlockDriverState *bs);
diff --git a/include/block/blockjob.h b/include/block/blockjob.h
index d84ccd8..b233d27 100644
--- a/include/block/blockjob.h
+++ b/include/block/blockjob.h
@@ -143,7 +143,7 @@ struct BlockJob {
int64_t speed;
/** The completion function that will be called when the job completes. */
- BlockCompletionFunc *cb;
+ BlockJobCompletionFunc *cb;
/** Block other operations when block job is running */
Error *blocker;
@@ -186,9 +186,11 @@ struct BlockJob {
* called from a wrapper that is specific to the job type.
*/
void *block_job_create(const BlockJobDriver *driver, BlockDriverState *bs,
- int64_t speed, BlockCompletionFunc *cb,
+ int64_t speed, BlockJobCompletionFunc *cb,
void *opaque, Error **errp);
+void *block_job_data(BlockJob *job);
+
/**
* block_job_sleep_ns:
* @job: The job that calls the function.
diff --git a/qemu-img.c b/qemu-img.c
index 8d11708..cc96cc8 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -635,9 +635,9 @@ typedef struct CommonBlockJobCBInfo {
Error **errp;
} CommonBlockJobCBInfo;
-static void common_block_job_cb(void *opaque, int ret)
+static void common_block_job_cb(BlockJob *job, int ret)
{
- CommonBlockJobCBInfo *cbi = opaque;
+ CommonBlockJobCBInfo *cbi = block_job_data(job);
if (ret < 0) {
error_setg_errno(cbi->errp, -ret, "Block job failed");
diff --git a/tests/test-blockjob-txn.c b/tests/test-blockjob-txn.c
index 34747e9..3e8d17d 100644
--- a/tests/test-blockjob-txn.c
+++ b/tests/test-blockjob-txn.c
@@ -66,9 +66,9 @@ typedef struct {
int *result;
} TestBlockJobCBData;
-static void test_block_job_cb(void *opaque, int ret)
+static void test_block_job_cb(BlockJob *job, int ret)
{
- TestBlockJobCBData *data = opaque;
+ TestBlockJobCBData *data = block_job_data(job);
if (!ret && block_job_is_cancelled(&data->job->common)) {
ret = -ECANCELED;
}
--
2.4.3