blockdev: Refuse to drive_del something added with blockdev-add

[qemu.git] / block.c

diff --git a/block.c b/block.c
index 1df13ac1c7bd8c55cf771ed96046c451002c5043..bcd952a4cb7865d4a13c6a53869c97b56eed241a 100644 (file)
--- a/block.c
+++ b/block.c
@@ -1819,6 +1819,8 @@ void bdrv_reopen_abort(BDRVReopenState *reopen_state)
 
 void bdrv_close(BlockDriverState *bs)
 {
+    BdrvAioNotifier *ban, *ban_next;
+
     if (bs->job) {
         block_job_cancel_sync(bs->job);
     }
@@ -1863,6 +1865,11 @@ void bdrv_close(BlockDriverState *bs)
     if (bs->io_limits_enabled) {
         bdrv_io_limits_disable(bs);
     }
+
+    QLIST_FOREACH_SAFE(ban, &bs->aio_notifiers, list, ban_next) {
+        g_free(ban);
+    }
+    QLIST_INIT(&bs->aio_notifiers);
 }
 
 void bdrv_close_all(void)
@@ -2239,7 +2246,7 @@ int bdrv_commit(BlockDriverState *bs)
 
     if (!drv)
         return -ENOMEDIUM;
-    
+
     if (!bs->backing_hd) {
         return -ENOTSUP;
     }
@@ -3356,9 +3363,8 @@ static int coroutine_fn bdrv_aligned_pwritev(BlockDriverState *bs,
 
     bdrv_set_dirty(bs, sector_num, nb_sectors);
 
-    if (bs->wr_highest_sector < sector_num + nb_sectors - 1) {
-        bs->wr_highest_sector = sector_num + nb_sectors - 1;
-    }
+    block_acct_highest_sector(&bs->stats, sector_num, nb_sectors);
+
     if (bs->growable && ret >= 0) {
         bs->total_sectors = MAX(bs->total_sectors, sector_num + nb_sectors);
     }
@@ -3632,6 +3638,19 @@ BlockErrorAction bdrv_get_error_action(BlockDriverState *bs, bool is_read, int e
     }
 }
 
+static void send_qmp_error_event(BlockDriverState *bs,
+                                 BlockErrorAction action,
+                                 bool is_read, int error)
+{
+    BlockErrorAction ac;
+
+    ac = is_read ? IO_OPERATION_TYPE_READ : IO_OPERATION_TYPE_WRITE;
+    qapi_event_send_block_io_error(bdrv_get_device_name(bs), ac, action,
+                                   bdrv_iostatus_is_enabled(bs),
+                                   error == ENOSPC, strerror(error),
+                                   &error_abort);
+}
+
 /* This is done by device models because, while the block layer knows
  * about the error, it does not know whether an operation comes from
  * the device or the block layer (from a job, for example).
@@ -3657,16 +3676,10 @@ void bdrv_error_action(BlockDriverState *bs, BlockErrorAction action,
          * also ensures that the STOP/RESUME pair of events is emitted.
          */
         qemu_system_vmstop_request_prepare();
-        qapi_event_send_block_io_error(bdrv_get_device_name(bs),
-                                       is_read ? IO_OPERATION_TYPE_READ :
-                                       IO_OPERATION_TYPE_WRITE,
-                                       action, &error_abort);
+        send_qmp_error_event(bs, action, is_read, error);
         qemu_system_vmstop_request(RUN_STATE_IO_ERROR);
     } else {
-        qapi_event_send_block_io_error(bdrv_get_device_name(bs),
-                                       is_read ? IO_OPERATION_TYPE_READ :
-                                       IO_OPERATION_TYPE_WRITE,
-                                       action, &error_abort);
+        send_qmp_error_event(bs, action, is_read, error);
     }
 }
 
@@ -4546,6 +4559,12 @@ static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs,
             // Add the second request
             qemu_iovec_concat(qiov, reqs[i].qiov, 0, reqs[i].qiov->size);
 
+            // Add tail of first request, if necessary
+            if (qiov->size < reqs[outidx].qiov->size) {
+                qemu_iovec_concat(qiov, reqs[outidx].qiov, qiov->size,
+                                  reqs[outidx].qiov->size - qiov->size);
+            }
+
             reqs[outidx].nb_sectors = qiov->size >> 9;
             reqs[outidx].qiov = qiov;
 
@@ -5553,27 +5572,6 @@ void bdrv_iostatus_set_err(BlockDriverState *bs, int error)
     }
 }
 
-void
-bdrv_acct_start(BlockDriverState *bs, BlockAcctCookie *cookie, int64_t bytes,
-        enum BlockAcctType type)
-{
-    assert(type < BDRV_MAX_IOTYPE);
-
-    cookie->bytes = bytes;
-    cookie->start_time_ns = get_clock();
-    cookie->type = type;
-}
-
-void
-bdrv_acct_done(BlockDriverState *bs, BlockAcctCookie *cookie)
-{
-    assert(cookie->type < BDRV_MAX_IOTYPE);
-
-    bs->nr_bytes[cookie->type] += cookie->bytes;
-    bs->nr_ops[cookie->type]++;
-    bs->total_time_ns[cookie->type] += get_clock() - cookie->start_time_ns;
-}
-
 void bdrv_img_create(const char *filename, const char *fmt,
                      const char *base_filename, const char *base_fmt,
                      char *options, uint64_t img_size, int flags,
@@ -5729,10 +5727,16 @@ AioContext *bdrv_get_aio_context(BlockDriverState *bs)
 
 void bdrv_detach_aio_context(BlockDriverState *bs)
 {
+    BdrvAioNotifier *baf;
+
     if (!bs->drv) {
         return;
     }
 
+    QLIST_FOREACH(baf, &bs->aio_notifiers, list) {
+        baf->detach_aio_context(baf->opaque);
+    }
+
     if (bs->io_limits_enabled) {
         throttle_detach_aio_context(&bs->throttle_state);
     }
@@ -5752,6 +5756,8 @@ void bdrv_detach_aio_context(BlockDriverState *bs)
 void bdrv_attach_aio_context(BlockDriverState *bs,
                              AioContext *new_context)
 {
+    BdrvAioNotifier *ban;
+
     if (!bs->drv) {
         return;
     }
@@ -5770,6 +5776,10 @@ void bdrv_attach_aio_context(BlockDriverState *bs,
     if (bs->io_limits_enabled) {
         throttle_attach_aio_context(&bs->throttle_state, new_context);
     }
+
+    QLIST_FOREACH(ban, &bs->aio_notifiers, list) {
+        ban->attached_aio_context(new_context, ban->opaque);
+    }
 }
 
 void bdrv_set_aio_context(BlockDriverState *bs, AioContext *new_context)
@@ -5786,6 +5796,43 @@ void bdrv_set_aio_context(BlockDriverState *bs, AioContext *new_context)
     aio_context_release(new_context);
 }
 
+void bdrv_add_aio_context_notifier(BlockDriverState *bs,
+        void (*attached_aio_context)(AioContext *new_context, void *opaque),
+        void (*detach_aio_context)(void *opaque), void *opaque)
+{
+    BdrvAioNotifier *ban = g_new(BdrvAioNotifier, 1);
+    *ban = (BdrvAioNotifier){
+        .attached_aio_context = attached_aio_context,
+        .detach_aio_context   = detach_aio_context,
+        .opaque               = opaque
+    };
+
+    QLIST_INSERT_HEAD(&bs->aio_notifiers, ban, list);
+}
+
+void bdrv_remove_aio_context_notifier(BlockDriverState *bs,
+                                      void (*attached_aio_context)(AioContext *,
+                                                                   void *),
+                                      void (*detach_aio_context)(void *),
+                                      void *opaque)
+{
+    BdrvAioNotifier *ban, *ban_next;
+
+    QLIST_FOREACH_SAFE(ban, &bs->aio_notifiers, list, ban_next) {
+        if (ban->attached_aio_context == attached_aio_context &&
+            ban->detach_aio_context   == detach_aio_context   &&
+            ban->opaque               == opaque)
+        {
+            QLIST_REMOVE(ban, list);
+            g_free(ban);
+
+            return;
+        }
+    }
+
+    abort();
+}
+
 void bdrv_add_before_write_notifier(BlockDriverState *bs,
                                     NotifierWithReturn *notifier)
 {
@@ -6041,3 +6088,14 @@ void bdrv_refresh_filename(BlockDriverState *bs)
         QDECREF(json);
     }
 }
+
+/* This accessor function purpose is to allow the device models to access the
+ * BlockAcctStats structure embedded inside a BlockDriverState without being
+ * aware of the BlockDriverState structure layout.
+ * It will go away when the BlockAcctStats structure will be moved inside
+ * the device models.
+ */
+BlockAcctStats *bdrv_get_stats(BlockDriverState *bs)
+{
+    return &bs->stats;
+}