Merge remote-tracking branch 'remotes/xanclic/tags/pull-block-2018-08-31-v2' into staging

Block patches:
- (Block) job exit refactoring, part 1
  (removing job_defer_to_main_loop())
- test-bdrv-drain leak fix

# gpg: Signature made Fri 31 Aug 2018 15:30:33 BST
# gpg:                using RSA key F407DB0061D5CF40
# gpg: Good signature from "Max Reitz <mreitz@redhat.com>"
# Primary key fingerprint: 91BE B60A 30DB 3E88 57D1  1829 F407 DB00 61D5 CF40

* remotes/xanclic/tags/pull-block-2018-08-31-v2:
  jobs: remove job_defer_to_main_loop
  jobs: remove ret argument to job_completed; privatize it
  block/backup: make function variables consistently named
  jobs: utilize job_exit shim
  block/mirror: utilize job_exit shim
  block/commit: utilize job_exit shim
  jobs: add exit shim
  jobs: canonize Error object
  jobs: change start callback to run callback
  tests: fix bdrv-drain leak

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

5 files changed, 76 insertions, 121 deletions

diff --git a/block/backup.c b/block/backup.c
index 8630d32926..4d084f6ca6 100644
--- a/block/backup.c
+++ b/block/backup.c
@@ -380,18 +380,6 @@ static BlockErrorAction backup_error_action(BackupBlockJob *job,
     }
 }
 
-typedef struct {
-    int ret;
-} BackupCompleteData;
-
-static void backup_complete(Job *job, void *opaque)
-{
-    BackupCompleteData *data = opaque;
-
-    job_completed(job, data->ret, NULL);
-    g_free(data);
-}
-
 static bool coroutine_fn yield_and_check(BackupBlockJob *job)
 {
     uint64_t delay_ns;
@@ -480,60 +468,59 @@ static void backup_incremental_init_copy_bitmap(BackupBlockJob *job)
     bdrv_dirty_iter_free(dbi);
 }
 
-static void coroutine_fn backup_run(void *opaque)
+static int coroutine_fn backup_run(Job *job, Error **errp)
 {
-    BackupBlockJob *job = opaque;
-    BackupCompleteData *data;
-    BlockDriverState *bs = blk_bs(job->common.blk);
+    BackupBlockJob *s = container_of(job, BackupBlockJob, common.job);
+    BlockDriverState *bs = blk_bs(s->common.blk);
     int64_t offset, nb_clusters;
     int ret = 0;
 
-    QLIST_INIT(&job->inflight_reqs);
-    qemu_co_rwlock_init(&job->flush_rwlock);
+    QLIST_INIT(&s->inflight_reqs);
+    qemu_co_rwlock_init(&s->flush_rwlock);
 
-    nb_clusters = DIV_ROUND_UP(job->len, job->cluster_size);
-    job_progress_set_remaining(&job->common.job, job->len);
+    nb_clusters = DIV_ROUND_UP(s->len, s->cluster_size);
+    job_progress_set_remaining(job, s->len);
 
-    job->copy_bitmap = hbitmap_alloc(nb_clusters, 0);
-    if (job->sync_mode == MIRROR_SYNC_MODE_INCREMENTAL) {
-        backup_incremental_init_copy_bitmap(job);
+    s->copy_bitmap = hbitmap_alloc(nb_clusters, 0);
+    if (s->sync_mode == MIRROR_SYNC_MODE_INCREMENTAL) {
+        backup_incremental_init_copy_bitmap(s);
     } else {
-        hbitmap_set(job->copy_bitmap, 0, nb_clusters);
+        hbitmap_set(s->copy_bitmap, 0, nb_clusters);
     }
 
 
-    job->before_write.notify = backup_before_write_notify;
-    bdrv_add_before_write_notifier(bs, &job->before_write);
+    s->before_write.notify = backup_before_write_notify;
+    bdrv_add_before_write_notifier(bs, &s->before_write);
 
-    if (job->sync_mode == MIRROR_SYNC_MODE_NONE) {
+    if (s->sync_mode == MIRROR_SYNC_MODE_NONE) {
         /* All bits are set in copy_bitmap to allow any cluster to be copied.
          * This does not actually require them to be copied. */
-        while (!job_is_cancelled(&job->common.job)) {
+        while (!job_is_cancelled(job)) {
             /* Yield until the job is cancelled.  We just let our before_write
              * notify callback service CoW requests. */
-            job_yield(&job->common.job);
+            job_yield(job);
         }
-    } else if (job->sync_mode == MIRROR_SYNC_MODE_INCREMENTAL) {
-        ret = backup_run_incremental(job);
+    } else if (s->sync_mode == MIRROR_SYNC_MODE_INCREMENTAL) {
+        ret = backup_run_incremental(s);
     } else {
         /* Both FULL and TOP SYNC_MODE's require copying.. */
-        for (offset = 0; offset < job->len;
-             offset += job->cluster_size) {
+        for (offset = 0; offset < s->len;
+             offset += s->cluster_size) {
             bool error_is_read;
             int alloced = 0;
 
-            if (yield_and_check(job)) {
+            if (yield_and_check(s)) {
                 break;
             }
 
-            if (job->sync_mode == MIRROR_SYNC_MODE_TOP) {
+            if (s->sync_mode == MIRROR_SYNC_MODE_TOP) {
                 int i;
                 int64_t n;
 
                 /* Check to see if these blocks are already in the
                  * backing file. */
 
-                for (i = 0; i < job->cluster_size;) {
+                for (i = 0; i < s->cluster_size;) {
                     /* bdrv_is_allocated() only returns true/false based
                      * on the first set of sectors it comes across that
                      * are are all in the same state.
@@ -542,7 +529,7 @@ static void coroutine_fn backup_run(void *opaque)
                      * needed but at some point that is always the case. */
                     alloced =
                         bdrv_is_allocated(bs, offset + i,
-                                          job->cluster_size - i, &n);
+                                          s->cluster_size - i, &n);
                     i += n;
 
                     if (alloced || n == 0) {
@@ -560,33 +547,31 @@ static void coroutine_fn backup_run(void *opaque)
             if (alloced < 0) {
                 ret = alloced;
             } else {
-                ret = backup_do_cow(job, offset, job->cluster_size,
+                ret = backup_do_cow(s, offset, s->cluster_size,
                                     &error_is_read, false);
             }
             if (ret < 0) {
                 /* Depending on error action, fail now or retry cluster */
                 BlockErrorAction action =
-                    backup_error_action(job, error_is_read, -ret);
+                    backup_error_action(s, error_is_read, -ret);
                 if (action == BLOCK_ERROR_ACTION_REPORT) {
                     break;
                 } else {
-                    offset -= job->cluster_size;
+                    offset -= s->cluster_size;
                     continue;
                 }
             }
         }
     }
 
-    notifier_with_return_remove(&job->before_write);
+    notifier_with_return_remove(&s->before_write);
 
     /* wait until pending backup_do_cow() calls have completed */
-    qemu_co_rwlock_wrlock(&job->flush_rwlock);
-    qemu_co_rwlock_unlock(&job->flush_rwlock);
-    hbitmap_free(job->copy_bitmap);
+    qemu_co_rwlock_wrlock(&s->flush_rwlock);
+    qemu_co_rwlock_unlock(&s->flush_rwlock);
+    hbitmap_free(s->copy_bitmap);
 
-    data = g_malloc(sizeof(*data));
-    data->ret = ret;
-    job_defer_to_main_loop(&job->common.job, backup_complete, data);
+    return ret;
 }
 
 static const BlockJobDriver backup_job_driver = {
@@ -596,7 +581,7 @@ static const BlockJobDriver backup_job_driver = {
         .free                   = block_job_free,
         .user_resume            = block_job_user_resume,
         .drain                  = block_job_drain,
-        .start                  = backup_run,
+        .run                    = backup_run,
         .commit                 = backup_commit,
         .abort                  = backup_abort,
         .clean                  = backup_clean,
diff --git a/block/commit.c b/block/commit.c
index eb414579bd..da69165de3 100644
--- a/block/commit.c
+++ b/block/commit.c
@@ -68,19 +68,13 @@ static int coroutine_fn commit_populate(BlockBackend *bs, BlockBackend *base,
     return 0;
 }
 
-typedef struct {
-    int ret;
-} CommitCompleteData;
-
-static void commit_complete(Job *job, void *opaque)
+static void commit_exit(Job *job)
 {
     CommitBlockJob *s = container_of(job, CommitBlockJob, common.job);
     BlockJob *bjob = &s->common;
-    CommitCompleteData *data = opaque;
     BlockDriverState *top = blk_bs(s->top);
     BlockDriverState *base = blk_bs(s->base);
     BlockDriverState *commit_top_bs = s->commit_top_bs;
-    int ret = data->ret;
     bool remove_commit_top_bs = false;
 
     /* Make sure commit_top_bs and top stay around until bdrv_replace_node() */
@@ -91,10 +85,10 @@ static void commit_complete(Job *job, void *opaque)
      * the normal backing chain can be restored. */
     blk_unref(s->base);
 
-    if (!job_is_cancelled(job) && ret == 0) {
+    if (!job_is_cancelled(job) && job->ret == 0) {
         /* success */
-        ret = bdrv_drop_intermediate(s->commit_top_bs, base,
-                                     s->backing_file_str);
+        job->ret = bdrv_drop_intermediate(s->commit_top_bs, base,
+                                          s->backing_file_str);
     } else {
         /* XXX Can (or should) we somehow keep 'consistent read' blocked even
          * after the failed/cancelled commit job is gone? If we already wrote
@@ -117,9 +111,6 @@ static void commit_complete(Job *job, void *opaque)
      * bdrv_set_backing_hd() to fail. */
     block_job_remove_all_bdrv(bjob);
 
-    job_completed(job, ret, NULL);
-    g_free(data);
-
     /* If bdrv_drop_intermediate() didn't already do that, remove the commit
      * filter driver from the backing chain. Do this as the final step so that
      * the 'consistent read' permission can be granted.  */
@@ -134,10 +125,9 @@ static void commit_complete(Job *job, void *opaque)
     bdrv_unref(top);
 }
 
-static void coroutine_fn commit_run(void *opaque)
+static int coroutine_fn commit_run(Job *job, Error **errp)
 {
-    CommitBlockJob *s = opaque;
-    CommitCompleteData *data;
+    CommitBlockJob *s = container_of(job, CommitBlockJob, common.job);
     int64_t offset;
     uint64_t delay_ns = 0;
     int ret = 0;
@@ -210,9 +200,7 @@ static void coroutine_fn commit_run(void *opaque)
 out:
     qemu_vfree(buf);
 
-    data = g_malloc(sizeof(*data));
-    data->ret = ret;
-    job_defer_to_main_loop(&s->common.job, commit_complete, data);
+    return ret;
 }
 
 static const BlockJobDriver commit_job_driver = {
@@ -222,7 +210,8 @@ static const BlockJobDriver commit_job_driver = {
         .free          = block_job_free,
         .user_resume   = block_job_user_resume,
         .drain         = block_job_drain,
-        .start         = commit_run,
+        .run           = commit_run,
+        .exit          = commit_exit,
     },
 };
 
diff --git a/block/create.c b/block/create.c
index 915cd41bcc..95341219ef 100644
--- a/block/create.c
+++ b/block/create.c
@@ -34,33 +34,26 @@ typedef struct BlockdevCreateJob {
     Job common;
     BlockDriver *drv;
     BlockdevCreateOptions *opts;
-    int ret;
-    Error *err;
 } BlockdevCreateJob;
 
-static void blockdev_create_complete(Job *job, void *opaque)
+static int coroutine_fn blockdev_create_run(Job *job, Error **errp)
 {
     BlockdevCreateJob *s = container_of(job, BlockdevCreateJob, common);
-
-    job_completed(job, s->ret, s->err);
-}
-
-static void coroutine_fn blockdev_create_run(void *opaque)
-{
-    BlockdevCreateJob *s = opaque;
+    int ret;
 
     job_progress_set_remaining(&s->common, 1);
-    s->ret = s->drv->bdrv_co_create(s->opts, &s->err);
+    ret = s->drv->bdrv_co_create(s->opts, errp);
     job_progress_update(&s->common, 1);
 
     qapi_free_BlockdevCreateOptions(s->opts);
-    job_defer_to_main_loop(&s->common, blockdev_create_complete, NULL);
+
+    return ret;
 }
 
 static const JobDriver blockdev_create_job_driver = {
     .instance_size = sizeof(BlockdevCreateJob),
     .job_type      = JOB_TYPE_CREATE,
-    .start         = blockdev_create_run,
+    .run           = blockdev_create_run,
 };
 
 void qmp_blockdev_create(const char *job_id, BlockdevCreateOptions *options,
diff --git a/block/mirror.c b/block/mirror.c
index 6cc10df5c9..b8941db6c1 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -607,26 +607,22 @@ static void mirror_wait_for_all_io(MirrorBlockJob *s)
     }
 }
 
-typedef struct {
-    int ret;
-} MirrorExitData;
-
-static void mirror_exit(Job *job, void *opaque)
+static void mirror_exit(Job *job)
 {
     MirrorBlockJob *s = container_of(job, MirrorBlockJob, common.job);
     BlockJob *bjob = &s->common;
-    MirrorExitData *data = opaque;
     MirrorBDSOpaque *bs_opaque = s->mirror_top_bs->opaque;
     AioContext *replace_aio_context = NULL;
     BlockDriverState *src = s->mirror_top_bs->backing->bs;
     BlockDriverState *target_bs = blk_bs(s->target);
     BlockDriverState *mirror_top_bs = s->mirror_top_bs;
     Error *local_err = NULL;
+    int ret = job->ret;
 
     bdrv_release_dirty_bitmap(src, s->dirty_bitmap);
 
-    /* Make sure that the source BDS doesn't go away before we called
-     * job_completed(). */
+    /* Make sure that the source BDS doesn't go away during bdrv_replace_node,
+     * before we can call bdrv_drained_end */
     bdrv_ref(src);
     bdrv_ref(mirror_top_bs);
     bdrv_ref(target_bs);
@@ -652,7 +648,7 @@ static void mirror_exit(Job *job, void *opaque)
             bdrv_set_backing_hd(target_bs, backing, &local_err);
             if (local_err) {
                 error_report_err(local_err);
-                data->ret = -EPERM;
+                ret = -EPERM;
             }
         }
     }
@@ -662,7 +658,7 @@ static void mirror_exit(Job *job, void *opaque)
         aio_context_acquire(replace_aio_context);
     }
 
-    if (s->should_complete && data->ret == 0) {
+    if (s->should_complete && ret == 0) {
         BlockDriverState *to_replace = src;
         if (s->to_replace) {
             to_replace = s->to_replace;
@@ -679,7 +675,7 @@ static void mirror_exit(Job *job, void *opaque)
         bdrv_drained_end(target_bs);
         if (local_err) {
             error_report_err(local_err);
-            data->ret = -EPERM;
+            ret = -EPERM;
         }
     }
     if (s->to_replace) {
@@ -710,12 +706,12 @@ static void mirror_exit(Job *job, void *opaque)
     blk_insert_bs(bjob->blk, mirror_top_bs, &error_abort);
 
     bs_opaque->job = NULL;
-    job_completed(job, data->ret, NULL);
 
-    g_free(data);
     bdrv_drained_end(src);
     bdrv_unref(mirror_top_bs);
     bdrv_unref(src);
+
+    job->ret = ret;
 }
 
 static void mirror_throttle(MirrorBlockJob *s)
@@ -812,10 +808,9 @@ static int mirror_flush(MirrorBlockJob *s)
     return ret;
 }
 
-static void coroutine_fn mirror_run(void *opaque)
+static int coroutine_fn mirror_run(Job *job, Error **errp)
 {
-    MirrorBlockJob *s = opaque;
-    MirrorExitData *data;
+    MirrorBlockJob *s = container_of(job, MirrorBlockJob, common.job);
     BlockDriverState *bs = s->mirror_top_bs->backing->bs;
     BlockDriverState *target_bs = blk_bs(s->target);
     bool need_drain = true;
@@ -1035,13 +1030,11 @@ immediate_exit:
     g_free(s->in_flight_bitmap);
     bdrv_dirty_iter_free(s->dbi);
 
-    data = g_malloc(sizeof(*data));
-    data->ret = ret;
-
     if (need_drain) {
         bdrv_drained_begin(bs);
     }
-    job_defer_to_main_loop(&s->common.job, mirror_exit, data);
+
+    return ret;
 }
 
 static void mirror_complete(Job *job, Error **errp)
@@ -1138,7 +1131,8 @@ static const BlockJobDriver mirror_job_driver = {
         .free                   = block_job_free,
         .user_resume            = block_job_user_resume,
         .drain                  = block_job_drain,
-        .start                  = mirror_run,
+        .run                    = mirror_run,
+        .exit                   = mirror_exit,
         .pause                  = mirror_pause,
         .complete               = mirror_complete,
     },
@@ -1154,7 +1148,8 @@ static const BlockJobDriver commit_active_job_driver = {
         .free                   = block_job_free,
         .user_resume            = block_job_user_resume,
         .drain                  = block_job_drain,
-        .start                  = mirror_run,
+        .run                    = mirror_run,
+        .exit                   = mirror_exit,
         .pause                  = mirror_pause,
         .complete               = mirror_complete,
     },
diff --git a/block/stream.c b/block/stream.c
index 9264b68a1e..67e1e72e23 100644
--- a/block/stream.c
+++ b/block/stream.c
@@ -54,20 +54,16 @@ static int coroutine_fn stream_populate(BlockBackend *blk,
     return blk_co_preadv(blk, offset, qiov.size, &qiov, BDRV_REQ_COPY_ON_READ);
 }
 
-typedef struct {
-    int ret;
-} StreamCompleteData;
-
-static void stream_complete(Job *job, void *opaque)
+static void stream_exit(Job *job)
 {
     StreamBlockJob *s = container_of(job, StreamBlockJob, common.job);
     BlockJob *bjob = &s->common;
-    StreamCompleteData *data = opaque;
     BlockDriverState *bs = blk_bs(bjob->blk);
     BlockDriverState *base = s->base;
     Error *local_err = NULL;
+    int ret = job->ret;
 
-    if (!job_is_cancelled(job) && bs->backing && data->ret == 0) {
+    if (!job_is_cancelled(job) && bs->backing && ret == 0) {
         const char *base_id = NULL, *base_fmt = NULL;
         if (base) {
             base_id = s->backing_file_str;
@@ -75,11 +71,11 @@ static void stream_complete(Job *job, void *opaque)
                 base_fmt = base->drv->format_name;
             }
         }
-        data->ret = bdrv_change_backing_file(bs, base_id, base_fmt);
+        ret = bdrv_change_backing_file(bs, base_id, base_fmt);
         bdrv_set_backing_hd(bs, base, &local_err);
         if (local_err) {
             error_report_err(local_err);
-            data->ret = -EPERM;
+            ret = -EPERM;
             goto out;
         }
     }
@@ -93,14 +89,12 @@ out:
     }
 
     g_free(s->backing_file_str);
-    job_completed(job, data->ret, NULL);
-    g_free(data);
+    job->ret = ret;
 }
 
-static void coroutine_fn stream_run(void *opaque)
+static int coroutine_fn stream_run(Job *job, Error **errp)
 {
-    StreamBlockJob *s = opaque;
-    StreamCompleteData *data;
+    StreamBlockJob *s = container_of(job, StreamBlockJob, common.job);
     BlockBackend *blk = s->common.blk;
     BlockDriverState *bs = blk_bs(blk);
     BlockDriverState *base = s->base;
@@ -203,9 +197,7 @@ static void coroutine_fn stream_run(void *opaque)
 
 out:
     /* Modify backing chain and close BDSes in main loop */
-    data = g_malloc(sizeof(*data));
-    data->ret = ret;
-    job_defer_to_main_loop(&s->common.job, stream_complete, data);
+    return ret;
 }
 
 static const BlockJobDriver stream_job_driver = {
@@ -213,7 +205,8 @@ static const BlockJobDriver stream_job_driver = {
         .instance_size = sizeof(StreamBlockJob),
         .job_type      = JOB_TYPE_STREAM,
         .free          = block_job_free,
-        .start         = stream_run,
+        .run           = stream_run,
+        .exit          = stream_exit,
         .user_resume   = block_job_user_resume,
         .drain         = block_job_drain,
     },