Merge remote-tracking branch 'remotes/marcandre/tags/for-6.0-pull-request' into staging

[mirror_qemu.git] / blockjob.c

diff --git a/blockjob.c b/blockjob.c
index 2abed0f55163dbb8de151aa0cd4213b35119a4c5..207e8c7fd9167755da7e9221c2fb81c8c91a2e0e 100644 (file)
--- a/blockjob.c
+++ b/blockjob.c
@@ -163,7 +163,7 @@ static void child_job_set_aio_ctx(BdrvChild *c, AioContext *ctx,
     job->job.aio_context = ctx;
 }
 
-static const BdrvChildRole child_job = {
+static const BdrvChildClass child_job = {
     .get_parent_desc    = child_job_get_parent_desc,
     .drained_begin      = child_job_drained_begin,
     .drained_poll       = child_job_drained_poll,
@@ -175,14 +175,23 @@ static const BdrvChildRole child_job = {
 
 void block_job_remove_all_bdrv(BlockJob *job)
 {
-    GSList *l;
-    for (l = job->nodes; l; l = l->next) {
+    /*
+     * bdrv_root_unref_child() may reach child_job_[can_]set_aio_ctx(),
+     * which will also traverse job->nodes, so consume the list one by
+     * one to make sure that such a concurrent access does not attempt
+     * to process an already freed BdrvChild.
+     */
+    while (job->nodes) {
+        GSList *l = job->nodes;
         BdrvChild *c = l->data;
+
+        job->nodes = l->next;
+
         bdrv_op_unblock_all(c->bs, job->blocker);
         bdrv_root_unref_child(c);
+
+        g_slist_free_1(l);
     }
-    g_slist_free(job->nodes);
-    job->nodes = NULL;
 }
 
 bool block_job_has_bdrv(BlockJob *job, BlockDriverState *bs)
@@ -203,14 +212,19 @@ int block_job_add_bdrv(BlockJob *job, const char *name, BlockDriverState *bs,
                        uint64_t perm, uint64_t shared_perm, Error **errp)
 {
     BdrvChild *c;
+    bool need_context_ops;
 
     bdrv_ref(bs);
-    if (job->job.aio_context != qemu_get_aio_context()) {
+
+    need_context_ops = bdrv_get_aio_context(bs) != job->job.aio_context;
+
+    if (need_context_ops && job->job.aio_context != qemu_get_aio_context()) {
         aio_context_release(job->job.aio_context);
     }
-    c = bdrv_root_attach_child(bs, name, &child_job, job->job.aio_context,
-                               perm, shared_perm, job, errp);
-    if (job->job.aio_context != qemu_get_aio_context()) {
+    c = bdrv_root_attach_child(bs, name, &child_job, 0,
+                               job->job.aio_context, perm, shared_perm, job,
+                               errp);
+    if (need_context_ops && job->job.aio_context != qemu_get_aio_context()) {
         aio_context_acquire(job->job.aio_context);
     }
     if (c == NULL) {
@@ -244,27 +258,36 @@ static bool job_timer_pending(Job *job)
     return timer_pending(&job->sleep_timer);
 }
 
-void block_job_set_speed(BlockJob *job, int64_t speed, Error **errp)
+bool block_job_set_speed(BlockJob *job, int64_t speed, Error **errp)
 {
+    const BlockJobDriver *drv = block_job_driver(job);
     int64_t old_speed = job->speed;
 
-    if (job_apply_verb(&job->job, JOB_VERB_SET_SPEED, errp)) {
-        return;
+    if (job_apply_verb(&job->job, JOB_VERB_SET_SPEED, errp) < 0) {
+        return false;
     }
     if (speed < 0) {
-        error_setg(errp, QERR_INVALID_PARAMETER, "speed");
-        return;
+        error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "speed",
+                   "a non-negative value");
+        return false;
     }
 
     ratelimit_set_speed(&job->limit, speed, BLOCK_JOB_SLICE_TIME);
 
     job->speed = speed;
+
+    if (drv->set_speed) {
+        drv->set_speed(job, speed);
+    }
+
     if (speed && speed <= old_speed) {
-        return;
+        return true;
     }
 
     /* kick only if a timer is pending */
     job_enter_cond(&job->job, job_timer_pending);
+
+    return true;
 }
 
 int64_t block_job_ratelimit_get_delay(BlockJob *job, uint64_t n)
@@ -287,18 +310,22 @@ BlockJobInfo *block_job_query(BlockJob *job, Error **errp)
     info = g_new0(BlockJobInfo, 1);
     info->type      = g_strdup(job_type_str(&job->job));
     info->device    = g_strdup(job->job.id);
-    info->busy      = atomic_read(&job->job.busy);
+    info->busy      = qatomic_read(&job->job.busy);
     info->paused    = job->job.pause_count > 0;
-    info->offset    = job->job.progress_current;
-    info->len       = job->job.progress_total;
+    info->offset    = job->job.progress.current;
+    info->len       = job->job.progress.total;
     info->speed     = job->speed;
     info->io_status = job->iostatus;
     info->ready     = job_is_ready(&job->job),
     info->status    = job->job.status;
     info->auto_finalize = job->job.auto_finalize;
     info->auto_dismiss  = job->job.auto_dismiss;
-    info->has_error = job->job.ret != 0;
-    info->error     = job->job.ret ? g_strdup(strerror(-job->job.ret)) : NULL;
+    if (job->job.ret) {
+        info->has_error = true;
+        info->error = job->job.err ?
+                        g_strdup(error_get_pretty(job->job.err)) :
+                        g_strdup(strerror(-job->job.ret));
+    }
     return info;
 }
 
@@ -320,8 +347,8 @@ static void block_job_event_cancelled(Notifier *n, void *opaque)
 
     qapi_event_send_block_job_cancelled(job_type(&job->job),
                                         job->job.id,
-                                        job->job.progress_total,
-                                        job->job.progress_current,
+                                        job->job.progress.total,
+                                        job->job.progress.current,
                                         job->speed);
 }
 
@@ -335,13 +362,13 @@ static void block_job_event_completed(Notifier *n, void *opaque)
     }
 
     if (job->job.ret < 0) {
-        msg = strerror(-job->job.ret);
+        msg = error_get_pretty(job->job.err);
     }
 
     qapi_event_send_block_job_completed(job_type(&job->job),
                                         job->job.id,
-                                        job->job.progress_total,
-                                        job->job.progress_current,
+                                        job->job.progress.total,
+                                        job->job.progress.current,
                                         job->speed,
                                         !!msg,
                                         msg);
@@ -369,8 +396,8 @@ static void block_job_event_ready(Notifier *n, void *opaque)
 
     qapi_event_send_block_job_ready(job_type(&job->job),
                                     job->job.id,
-                                    job->job.progress_total,
-                                    job->job.progress_current,
+                                    job->job.progress.total,
+                                    job->job.progress.current,
                                     job->speed);
 }
 
@@ -387,16 +414,13 @@ void *block_job_create(const char *job_id, const BlockJobDriver *driver,
 {
     BlockBackend *blk;
     BlockJob *job;
-    int ret;
 
     if (job_id == NULL && !(flags & JOB_INTERNAL)) {
         job_id = bdrv_get_device_name(bs);
     }
 
-    blk = blk_new(bdrv_get_aio_context(bs), perm, shared_perm);
-    ret = blk_insert_bs(blk, bs, errp);
-    if (ret < 0) {
-        blk_unref(blk);
+    blk = blk_new_with_bs(bs, perm, shared_perm, errp);
+    if (!blk) {
         return NULL;
     }
 
@@ -440,12 +464,8 @@ void *block_job_create(const char *job_id, const BlockJobDriver *driver,
 
     /* Only set speed when necessary to avoid NotSupported error */
     if (speed != 0) {
-        Error *local_err = NULL;
-
-        block_job_set_speed(job, speed, &local_err);
-        if (local_err) {
+        if (!block_job_set_speed(job, speed, errp)) {
             job_early_fail(&job->job);
-            error_propagate(errp, local_err);
             return NULL;
         }
     }