X-Git-Url: https://git.proxmox.com/?a=blobdiff_plain;f=blockjob.c;h=513620c199fde95f7448d01e3e3c33fb3724ba21;hb=a3e1505daec31ef56f0489f8c8fff1b8e4ca92bd;hp=205da9df4e03d0341312bbb77d73f447e8076b50;hpb=60a0f1af07d685c88f4ffa09370da5bd7514823e;p=mirror_qemu.git

diff --git a/blockjob.c b/blockjob.c
index 205da9df4e..513620c199 100644
--- a/blockjob.c
+++ b/blockjob.c
@@ -27,16 +27,20 @@
 #include "qemu-common.h"
 #include "trace.h"
 #include "block/block.h"
-#include "block/blockjob.h"
+#include "block/blockjob_int.h"
 #include "block/block_int.h"
 #include "sysemu/block-backend.h"
 #include "qapi/qmp/qerror.h"
 #include "qapi/qmp/qjson.h"
 #include "qemu/coroutine.h"
+#include "qemu/id.h"
 #include "qmp-commands.h"
 #include "qemu/timer.h"
 #include "qapi-event.h"
 
+static void block_job_event_cancelled(BlockJob *job);
+static void block_job_event_completed(BlockJob *job, const char *msg);
+
 /* Transactional group of block jobs */
 struct BlockJobTxn {
 
@@ -60,15 +64,17 @@ BlockJob *block_job_next(BlockJob *job)
     return QLIST_NEXT(job, job_list);
 }
 
-/* Normally the job runs in its BlockBackend's AioContext.  The exception is
- * block_job_defer_to_main_loop() where it runs in the QEMU main loop.  Code
- * that supports both cases uses this helper function.
- */
-static AioContext *block_job_get_aio_context(BlockJob *job)
+BlockJob *block_job_get(const char *id)
 {
-    return job->deferred_to_main_loop ?
-           qemu_get_aio_context() :
-           blk_get_aio_context(job->blk);
+    BlockJob *job;
+
+    QLIST_FOREACH(job, &block_jobs, job_list) {
+        if (job->id && !strcmp(id, job->id)) {
+            return job;
+        }
+    }
+
+    return NULL;
 }
 
 static void block_job_attached_aio_context(AioContext *new_context,
@@ -83,6 +89,17 @@ static void block_job_attached_aio_context(AioContext *new_context,
     block_job_resume(job);
 }
 
+static void block_job_drain(BlockJob *job)
+{
+    /* If job is !job->busy this kicks it into the next pause point. */
+    block_job_enter(job);
+
+    blk_drain(job->blk);
+    if (job->driver->drain) {
+        job->driver->drain(job);
+    }
+}
+
 static void block_job_detach_aio_context(void *opaque)
 {
     BlockJob *job = opaque;
@@ -92,45 +109,74 @@ static void block_job_detach_aio_context(void *opaque)
 
     block_job_pause(job);
 
-    if (!job->paused) {
-        /* If job is !job->busy this kicks it into the next pause point. */
-        block_job_enter(job);
-    }
     while (!job->paused && !job->completed) {
-        aio_poll(block_job_get_aio_context(job), true);
+        block_job_drain(job);
     }
 
     block_job_unref(job);
 }
 
-void *block_job_create(const BlockJobDriver *driver, BlockDriverState *bs,
-                       int64_t speed, BlockCompletionFunc *cb,
-                       void *opaque, Error **errp)
+void block_job_add_bdrv(BlockJob *job, BlockDriverState *bs)
+{
+    job->nodes = g_slist_prepend(job->nodes, bs);
+    bdrv_ref(bs);
+    bdrv_op_block_all(bs, job->blocker);
+}
+
+void *block_job_create(const char *job_id, const BlockJobDriver *driver,
+                       BlockDriverState *bs, int64_t speed, int flags,
+                       BlockCompletionFunc *cb, void *opaque, Error **errp)
 {
     BlockBackend *blk;
     BlockJob *job;
 
-    assert(cb);
     if (bs->job) {
         error_setg(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs));
         return NULL;
     }
 
+    if (job_id == NULL && !(flags & BLOCK_JOB_INTERNAL)) {
+        job_id = bdrv_get_device_name(bs);
+        if (!*job_id) {
+            error_setg(errp, "An explicit job ID is required for this node");
+            return NULL;
+        }
+    }
+
+    if (job_id) {
+        if (flags & BLOCK_JOB_INTERNAL) {
+            error_setg(errp, "Cannot specify job ID for internal block job");
+            return NULL;
+        }
+
+        if (!id_wellformed(job_id)) {
+            error_setg(errp, "Invalid job ID '%s'", job_id);
+            return NULL;
+        }
+
+        if (block_job_get(job_id)) {
+            error_setg(errp, "Job ID '%s' already in use", job_id);
+            return NULL;
+        }
+    }
+
     blk = blk_new();
     blk_insert_bs(blk, bs);
 
     job = g_malloc0(driver->instance_size);
     error_setg(&job->blocker, "block device is in use by block job: %s",
                BlockJobType_lookup[driver->job_type]);
-    bdrv_op_block_all(bs, job->blocker);
+    block_job_add_bdrv(job, bs);
     bdrv_op_unblock(bs, BLOCK_OP_TYPE_DATAPLANE, job->blocker);
 
     job->driver        = driver;
-    job->id            = g_strdup(bdrv_get_device_name(bs));
+    job->id            = g_strdup(job_id);
     job->blk           = blk;
     job->cb            = cb;
     job->opaque        = opaque;
-    job->busy          = true;
+    job->busy          = false;
+    job->paused        = true;
+    job->pause_count   = 1;
     job->refcnt        = 1;
     bs->job = job;
 
@@ -153,6 +199,28 @@ void *block_job_create(const BlockJobDriver *driver, BlockDriverState *bs,
     return job;
 }
 
+bool block_job_is_internal(BlockJob *job)
+{
+    return (job->id == NULL);
+}
+
+static bool block_job_started(BlockJob *job)
+{
+    return job->co;
+}
+
+void block_job_start(BlockJob *job)
+{
+    assert(job && !block_job_started(job) && job->paused &&
+           !job->busy && job->driver->start);
+    job->co = qemu_coroutine_create(job->driver->start, job);
+    if (--job->pause_count == 0) {
+        job->paused = false;
+        job->busy = true;
+        qemu_coroutine_enter(job->co);
+    }
+}
+
 void block_job_ref(BlockJob *job)
 {
     ++job->refcnt;
@@ -161,9 +229,15 @@ void block_job_ref(BlockJob *job)
 void block_job_unref(BlockJob *job)
 {
     if (--job->refcnt == 0) {
+        GSList *l;
         BlockDriverState *bs = blk_bs(job->blk);
         bs->job = NULL;
-        bdrv_op_unblock_all(bs, job->blocker);
+        for (l = job->nodes; l; l = l->next) {
+            bs = l->data;
+            bdrv_op_unblock_all(bs, job->blocker);
+            bdrv_unref(bs);
+        }
+        g_slist_free(job->nodes);
         blk_remove_aio_context_notifier(job->blk,
                                         block_job_attached_aio_context,
                                         block_job_detach_aio_context, job);
@@ -186,8 +260,29 @@ static void block_job_completed_single(BlockJob *job)
             job->driver->abort(job);
         }
     }
-    job->cb(job->opaque, job->ret);
+    if (job->driver->clean) {
+        job->driver->clean(job);
+    }
+
+    if (job->cb) {
+        job->cb(job->opaque, job->ret);
+    }
+
+    /* Emit events only if we actually started */
+    if (block_job_started(job)) {
+        if (block_job_is_cancelled(job)) {
+            block_job_event_cancelled(job);
+        } else {
+            const char *msg = NULL;
+            if (job->ret < 0) {
+                msg = strerror(-job->ret);
+            }
+            block_job_event_completed(job, msg);
+        }
+    }
+
     if (job->txn) {
+        QLIST_REMOVE(job, txn_list);
         block_job_txn_unref(job->txn);
     }
     block_job_unref(job);
@@ -289,8 +384,12 @@ void block_job_set_speed(BlockJob *job, int64_t speed, Error **errp)
 
 void block_job_complete(BlockJob *job, Error **errp)
 {
-    if (job->pause_count || job->cancelled || !job->driver->complete) {
-        error_setg(errp, QERR_BLOCK_JOB_NOT_READY, job->id);
+    /* Should not be reachable via external interface for internal jobs */
+    assert(job->id);
+    if (job->pause_count || job->cancelled ||
+        !block_job_started(job) || !job->driver->complete) {
+        error_setg(errp, "The active block job '%s' cannot be completed",
+                   job->id);
         return;
     }
 
@@ -302,13 +401,26 @@ void block_job_pause(BlockJob *job)
     job->pause_count++;
 }
 
+void block_job_user_pause(BlockJob *job)
+{
+    job->user_paused = true;
+    block_job_pause(job);
+}
+
 static bool block_job_should_pause(BlockJob *job)
 {
     return job->pause_count > 0;
 }
 
+bool block_job_user_paused(BlockJob *job)
+{
+    return job ? job->user_paused : 0;
+}
+
 void coroutine_fn block_job_pause_point(BlockJob *job)
 {
+    assert(job && block_job_started(job));
+
     if (!block_job_should_pause(job)) {
         return;
     }
@@ -343,18 +455,30 @@ void block_job_resume(BlockJob *job)
     block_job_enter(job);
 }
 
+void block_job_user_resume(BlockJob *job)
+{
+    if (job && job->user_paused && job->pause_count > 0) {
+        job->user_paused = false;
+        block_job_resume(job);
+    }
+}
+
 void block_job_enter(BlockJob *job)
 {
     if (job->co && !job->busy) {
-        qemu_coroutine_enter(job->co, NULL);
+        qemu_coroutine_enter(job->co);
     }
 }
 
 void block_job_cancel(BlockJob *job)
 {
-    job->cancelled = true;
-    block_job_iostatus_reset(job);
-    block_job_enter(job);
+    if (block_job_started(job)) {
+        job->cancelled = true;
+        block_job_iostatus_reset(job);
+        block_job_enter(job);
+    } else {
+        block_job_completed(job, -ECANCELED);
+    }
 }
 
 bool block_job_is_cancelled(BlockJob *job)
@@ -380,14 +504,21 @@ static int block_job_finish_sync(BlockJob *job,
     assert(blk_bs(job->blk)->job == job);
 
     block_job_ref(job);
+
     finish(job, &local_err);
     if (local_err) {
         error_propagate(errp, local_err);
         block_job_unref(job);
         return -EBUSY;
     }
+    /* block_job_drain calls block_job_enter, and it should be enough to
+     * induce progress until the job completes or moves to the main thread.
+    */
+    while (!job->deferred_to_main_loop && !job->completed) {
+        block_job_drain(job);
+    }
     while (!job->completed) {
-        aio_poll(block_job_get_aio_context(job), true);
+        aio_poll(qemu_get_aio_context(), true);
     }
     ret = (job->cancelled && job->ret == 0) ? -ECANCELED : job->ret;
     block_job_unref(job);
@@ -461,9 +592,15 @@ void block_job_yield(BlockJob *job)
     block_job_pause_point(job);
 }
 
-BlockJobInfo *block_job_query(BlockJob *job)
+BlockJobInfo *block_job_query(BlockJob *job, Error **errp)
 {
-    BlockJobInfo *info = g_new0(BlockJobInfo, 1);
+    BlockJobInfo *info;
+
+    if (block_job_is_internal(job)) {
+        error_setg(errp, "Cannot query QEMU internal jobs");
+        return NULL;
+    }
+    info = g_new0(BlockJobInfo, 1);
     info->type      = g_strdup(BlockJobType_lookup[job->driver->job_type]);
     info->device    = g_strdup(job->id);
     info->len       = job->len;
@@ -484,8 +621,12 @@ static void block_job_iostatus_set_err(BlockJob *job, int error)
     }
 }
 
-void block_job_event_cancelled(BlockJob *job)
+static void block_job_event_cancelled(BlockJob *job)
 {
+    if (block_job_is_internal(job)) {
+        return;
+    }
+
     qapi_event_send_block_job_cancelled(job->driver->job_type,
                                         job->id,
                                         job->len,
@@ -494,8 +635,12 @@ void block_job_event_cancelled(BlockJob *job)
                                         &error_abort);
 }
 
-void block_job_event_completed(BlockJob *job, const char *msg)
+static void block_job_event_completed(BlockJob *job, const char *msg)
 {
+    if (block_job_is_internal(job)) {
+        return;
+    }
+
     qapi_event_send_block_job_completed(job->driver->job_type,
                                         job->id,
                                         job->len,
@@ -510,6 +655,10 @@ void block_job_event_ready(BlockJob *job)
 {
     job->ready = true;
 
+    if (block_job_is_internal(job)) {
+        return;
+    }
+
     qapi_event_send_block_job_ready(job->driver->job_type,
                                     job->id,
                                     job->len,
@@ -524,6 +673,7 @@ BlockErrorAction block_job_error_action(BlockJob *job, BlockdevOnError on_err,
 
     switch (on_err) {
     case BLOCKDEV_ON_ERROR_ENOSPC:
+    case BLOCKDEV_ON_ERROR_AUTO:
         action = (error == ENOSPC) ?
                  BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT;
         break;
@@ -539,14 +689,15 @@ BlockErrorAction block_job_error_action(BlockJob *job, BlockdevOnError on_err,
     default:
         abort();
     }
-    qapi_event_send_block_job_error(job->id,
-                                    is_read ? IO_OPERATION_TYPE_READ :
-                                    IO_OPERATION_TYPE_WRITE,
-                                    action, &error_abort);
+    if (!block_job_is_internal(job)) {
+        qapi_event_send_block_job_error(job->id,
+                                        is_read ? IO_OPERATION_TYPE_READ :
+                                        IO_OPERATION_TYPE_WRITE,
+                                        action, &error_abort);
+    }
     if (action == BLOCK_ERROR_ACTION_STOP) {
         /* make the pause user visible, which will be resumed from QMP. */
-        job->user_paused = true;
-        block_job_pause(job);
+        block_job_user_pause(job);
         block_job_iostatus_set_err(job, error);
     }
     return action;
@@ -554,7 +705,6 @@ BlockErrorAction block_job_error_action(BlockJob *job, BlockdevOnError on_err,
 
 typedef struct {
     BlockJob *job;
-    QEMUBH *bh;
     AioContext *aio_context;
     BlockJobDeferToMainLoopFn *fn;
     void *opaque;
@@ -565,8 +715,6 @@ static void block_job_defer_to_main_loop_bh(void *opaque)
     BlockJobDeferToMainLoopData *data = opaque;
     AioContext *aio_context;
 
-    qemu_bh_delete(data->bh);
-
     /* Prevent race with block_job_defer_to_main_loop() */
     aio_context_acquire(data->aio_context);
 
@@ -590,13 +738,13 @@ void block_job_defer_to_main_loop(BlockJob *job,
 {
     BlockJobDeferToMainLoopData *data = g_malloc(sizeof(*data));
     data->job = job;
-    data->bh = qemu_bh_new(block_job_defer_to_main_loop_bh, data);
     data->aio_context = blk_get_aio_context(job->blk);
     data->fn = fn;
     data->opaque = opaque;
     job->deferred_to_main_loop = true;
 
-    qemu_bh_schedule(data->bh);
+    aio_bh_schedule_oneshot(qemu_get_aio_context(),
+                            block_job_defer_to_main_loop_bh, data);
 }
 
 BlockJobTxn *block_job_txn_new(void)