ppc/pnv: Drop PnvPsiClass::chip_type

[qemu.git] / blockjob.c

diff --git a/blockjob.c b/blockjob.c
index 1fac6bb8a71b0743bd9f8092044ecfab8a3457bf..c6e20e2fcde53c82146cb45efd875adf4ba77430 100644 (file)
--- a/blockjob.c
+++ b/blockjob.c
@@ -33,6 +33,7 @@
 #include "qapi/qapi-events-block-core.h"
 #include "qapi/qmp/qerror.h"
 #include "qemu/coroutine.h"
+#include "qemu/main-loop.h"
 #include "qemu/timer.h"
 
 /*
@@ -83,26 +84,12 @@ BlockJob *block_job_get(const char *id)
 void block_job_free(Job *job)
 {
     BlockJob *bjob = container_of(job, BlockJob, job);
-    BlockDriverState *bs = blk_bs(bjob->blk);
 
-    bs->job = NULL;
     block_job_remove_all_bdrv(bjob);
     blk_unref(bjob->blk);
     error_free(bjob->blocker);
 }
 
-void block_job_drain(Job *job)
-{
-    BlockJob *bjob = container_of(job, BlockJob, job);
-    const JobDriver *drv = job->driver;
-    BlockJobDriver *bjdrv = container_of(drv, BlockJobDriver, job_driver);
-
-    blk_drain(bjob->blk);
-    if (bjdrv->drain) {
-        bjdrv->drain(bjob);
-    }
-}
-
 static char *child_job_get_parent_desc(BdrvChild *c)
 {
     BlockJob *job = c->opaque;
@@ -137,7 +124,7 @@ static bool child_job_drained_poll(BdrvChild *c)
     }
 }
 
-static void child_job_drained_end(BdrvChild *c)
+static void child_job_drained_end(BdrvChild *c, int *drained_end_counter)
 {
     BlockJob *job = c->opaque;
     job_resume(&job->job);
@@ -188,14 +175,37 @@ 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)
+{
+    GSList *el;
+
+    for (el = job->nodes; el; el = el->next) {
+        BdrvChild *c = el->data;
+        if (c->bs == bs) {
+            return true;
+        }
+    }
+
+    return false;
 }
 
 int block_job_add_bdrv(BlockJob *job, const char *name, BlockDriverState *bs,
@@ -388,11 +398,6 @@ void *block_job_create(const char *job_id, const BlockJobDriver *driver,
     BlockJob *job;
     int ret;
 
-    if (bs->job) {
-        error_setg(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs));
-        return NULL;
-    }
-
     if (job_id == NULL && !(flags & JOB_INTERNAL)) {
         job_id = bdrv_get_device_name(bs);
     }
@@ -414,7 +419,6 @@ void *block_job_create(const char *job_id, const BlockJobDriver *driver,
     assert(is_block_job(&job->job));
     assert(job->job.driver->free == &block_job_free);
     assert(job->job.driver->user_resume == &block_job_user_resume);
-    assert(job->job.driver->drain == &block_job_drain);
 
     job->blk = blk;
 
@@ -435,10 +439,12 @@ void *block_job_create(const char *job_id, const BlockJobDriver *driver,
     error_setg(&job->blocker, "block device is in use by block job: %s",
                job_type_str(&job->job));
     block_job_add_bdrv(job, "main node", bs, 0, BLK_PERM_ALL, &error_abort);
-    bs->job = job;
 
     bdrv_op_unblock(bs, BLOCK_OP_TYPE_DATAPLANE, job->blocker);
 
+    /* Disable request queuing in the BlockBackend to avoid deadlocks on drain:
+     * The job reports that it's busy until it reaches a pause point. */
+    blk_set_disable_request_queuing(blk, true);
     blk_set_allow_aio_context_change(blk, true);
 
     /* Only set speed when necessary to avoid NotSupported error */