linux-user/strace.list: fix epoll_create{,1} -strace output

[qemu.git] / blockjob.c

diff --git a/blockjob.c b/blockjob.c
index cc5f18e7cd2cf77547a075eae78a4a3cb37a7772..470facfd47a08b3c084796cc64e7521774a3175b 100644 (file)
--- a/blockjob.c
+++ b/blockjob.c
@@ -24,7 +24,6 @@
  */
 
 #include "qemu/osdep.h"
-#include "qemu-common.h"
 #include "block/block.h"
 #include "block/blockjob_int.h"
 #include "block/block_int.h"
@@ -34,6 +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"
 
 /*
@@ -84,26 +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;
@@ -138,7 +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);
@@ -177,7 +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,
@@ -189,14 +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);
+    }
+}
+
+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;
+        }
     }
-    g_slist_free(job->nodes);
-    job->nodes = NULL;
+
+    return false;
 }
 
 int block_job_add_bdrv(BlockJob *job, const char *name, BlockDriverState *bs,
@@ -205,8 +214,15 @@ int block_job_add_bdrv(BlockJob *job, const char *name, BlockDriverState *bs,
     BdrvChild *c;
 
     bdrv_ref(bs);
-    c = bdrv_root_attach_child(bs, name, &child_job, perm, shared_perm,
-                               job, errp);
+    if (job->job.aio_context != qemu_get_aio_context()) {
+        aio_context_release(job->job.aio_context);
+    }
+    c = bdrv_root_attach_child(bs, name, &child_job, 0,
+                               job->job.aio_context, perm, shared_perm, job,
+                               errp);
+    if (job->job.aio_context != qemu_get_aio_context()) {
+        aio_context_acquire(job->job.aio_context);
+    }
     if (c == NULL) {
         return -EPERM;
     }
@@ -246,7 +262,8 @@ void block_job_set_speed(BlockJob *job, int64_t speed, Error **errp)
         return;
     }
     if (speed < 0) {
-        error_setg(errp, QERR_INVALID_PARAMETER, "speed");
+        error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "speed",
+                   "a non-negative value");
         return;
     }
 
@@ -283,8 +300,8 @@ BlockJobInfo *block_job_query(BlockJob *job, Error **errp)
     info->device    = g_strdup(job->job.id);
     info->busy      = atomic_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),
@@ -314,8 +331,8 @@ 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);
 }
 
@@ -334,8 +351,8 @@ static void block_job_event_completed(Notifier *n, void *opaque)
 
     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);
@@ -363,8 +380,8 @@ 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);
 }
 
@@ -381,21 +398,13 @@ void *block_job_create(const char *job_id, const BlockJobDriver *driver,
 {
     BlockBackend *blk;
     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);
     }
 
-    blk = blk_new(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;
     }
 
@@ -409,7 +418,6 @@ 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;
 
@@ -430,10 +438,12 @@ 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 */