File 0073-xen-add-block-resize-support-for-xe.patch of Package qemu-testsuite.20749

From: Bruce Rogers <brogers@suse.com>
Date: Mon, 11 Jun 2018 13:53:40 -0600
Subject: xen: add block resize support for xen disks

In the context of a monitor based disk resize, provide notification
of the new size to the front end xen block driver via a xenstore update.

[BR: FATE#325467, BSC#1094725]
Signed-off-by: Bruce Rogers <brogers@suse.com>
---
 block/block-backend.c          | 7 +++++++
 blockdev.c                     | 8 ++++++++
 hw/block/xen_disk.c            | 9 +++++++++
 include/hw/xen/xen.h           | 2 ++
 include/sysemu/block-backend.h | 2 ++
 stubs/xen-common.c             | 4 ++++
 6 files changed, 32 insertions(+)

diff --git a/block/block-backend.c b/block/block-backend.c
index 5288b67914b468f73914c293ffe1..a9073760fc55c5aa29642f5a5159 100644
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -1900,6 +1900,13 @@ int blk_truncate(BlockBackend *blk, int64_t offset, PreallocMode prealloc,
     return bdrv_truncate(blk->root, offset, prealloc, errp);
 }
 
+void blk_legacy_resize_cb(BlockBackend *blk)
+{
+    if (blk->legacy_dev) {
+        xen_blk_resize_cb(blk->dev);
+    }
+}
+
 static void blk_pdiscard_entry(void *opaque)
 {
     BlkRwCo *rwco = opaque;
diff --git a/blockdev.c b/blockdev.c
index 56a6b24a0be3dd78c397ab95f92f..67339b475a6e584f308741e810a6 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -2918,6 +2918,7 @@ void qmp_block_resize(bool has_device, const char *device,
 {
     Error *local_err = NULL;
     BlockBackend *blk = NULL;
+    BlockBackend *cb_blk = NULL;
     BlockDriverState *bs;
     AioContext *aio_context;
     int ret;
@@ -2930,6 +2931,10 @@ void qmp_block_resize(bool has_device, const char *device,
         return;
     }
 
+    if (has_device) {
+        cb_blk = blk_by_name(device);
+    }
+
     aio_context = bdrv_get_aio_context(bs);
     aio_context_acquire(aio_context);
 
@@ -2956,6 +2961,9 @@ void qmp_block_resize(bool has_device, const char *device,
 
     bdrv_drained_begin(bs);
     ret = blk_truncate(blk, size, PREALLOC_MODE_OFF, errp);
+    if (!ret && cb_blk) {
+        blk_legacy_resize_cb(cb_blk);
+    }
     bdrv_drained_end(bs);
 
 out:
diff --git a/hw/block/xen_disk.c b/hw/block/xen_disk.c
index 67f8464f6aaa0888807656387f33..3556ceb6a2a03582e099b8ace46d 100644
--- a/hw/block/xen_disk.c
+++ b/hw/block/xen_disk.c
@@ -1400,6 +1400,15 @@ char *xen_blk_get_attached_dev_id(void *dev)
     return g_strdup_printf("xen-qdisk-%i", blkdev->xendev.dev);
 }
 
+void xen_blk_resize_cb(void *dev)
+{
+    struct XenBlkDev *blkdev = dev;
+    blkdev->file_size = blk_getlength(blkdev->blk);
+    xenstore_write_be_int64(&blkdev->xendev, "sectors",
+                            blkdev->file_size / blkdev->file_blk);
+    xen_be_set_state(&blkdev->xendev, blkdev->xendev.be_state);
+}
+
 struct XenDevOps xen_blkdev_ops = {
     .size       = sizeof(struct XenBlkDev),
     .alloc      = blk_alloc,
diff --git a/include/hw/xen/xen.h b/include/hw/xen/xen.h
index a201517675c6f7b05399ff55eb2d..d923ae53f1085431bbcb673bb024 100644
--- a/include/hw/xen/xen.h
+++ b/include/hw/xen/xen.h
@@ -50,4 +50,6 @@ void xen_register_framebuffer(struct MemoryRegion *mr);
 
 char *xen_blk_get_attached_dev_id(void *dev);
 
+void xen_blk_resize_cb(void *dev);
+
 #endif /* QEMU_HW_XEN_H */
diff --git a/include/sysemu/block-backend.h b/include/sysemu/block-backend.h
index c4e52a5fa3969742d008c6f6620d..46f45c4dc34723bb892a9c206ee7 100644
--- a/include/sysemu/block-backend.h
+++ b/include/sysemu/block-backend.h
@@ -229,4 +229,6 @@ void blk_io_limits_enable(BlockBackend *blk, const char *group);
 void blk_io_limits_update_group(BlockBackend *blk, const char *group);
 void blk_set_force_allow_inactivate(BlockBackend *blk);
 
+void blk_legacy_resize_cb(BlockBackend *blk);
+
 #endif
diff --git a/stubs/xen-common.c b/stubs/xen-common.c
index aeac0534acf2a38fb23877ae671a..c2cbf81a879ab30bb1f9a10749bd 100644
--- a/stubs/xen-common.c
+++ b/stubs/xen-common.c
@@ -17,3 +17,7 @@ char *xen_blk_get_attached_dev_id(void *dev)
 {
     return g_strdup("");
 }
+
+void xen_blk_resize_cb(void *dev)
+{
+}