[sheepdog] Call to sd_truncate()

[Liu Yuan]

On Fri, Dec 13, 2013 at 05:01:42PM +0100, Hadrien KOHL wrote:
> Here we go:
> 
> # qemu-img create -f qcow2 sheepdog:test 10G
> Formatting 'sheepdog:test', fmt=qcow2 size=10737418240 encryption=off
> cluster_size=65536 lazy_refcounts=off
> 
> # qemu-system-x86_64 -machine accel=kvm:tcg -drive
> file=sheepdog:127.0.0.1:7000:test,if=none,id=virtio-disk0,format=qcow2,cache=writeback
> -cdrom /vm/iso/install-amd64-minimal-20131010.iso -device
> virtio-blk-pci,scsi=off,bus=pci.0,addr=0x4,drive=virtio-disk0,id=virtio-disk0,bootindex=1
> -boot cd -m 1024 -name test -vnc 172.16.0.11:0 -bios
> /usr/local/share/qemu/bios.bin
> 65798144, 73555968
> qemu-system-x86_64: shrinking is not supported
> 371130368, 379322368
> qemu-system-x86_64: shrinking is not supported
> 455671808, 472121344
> qemu-system-x86_64: shrinking is not supported
> 666042368, 674234368
> qemu-system-x86_64: shrinking is not supported
> 776339456, 791805952
> qemu-system-x86_64: shrinking is not supported
> 796459008, 796471296
> qemu-system-x86_64: shrinking is not supported

Can you try following patch

diff --git a/block/sheepdog.c b/block/sheepdog.c
index b4ae50f..9fb3c78 100644
--- a/block/sheepdog.c
+++ b/block/sheepdog.c
@@ -1774,6 +1774,7 @@ static int sd_truncate(BlockDriverState *bs, int64_t offset)
     unsigned int datalen;
 
     if (offset < s->inode.vdi_size) {
+        printf("%ld, %ld, %lld\n", offset, s->inode.vdi_size, bs->total_sectors * BDRV_SECTOR_SIZE);
         error_report("shrinking is not supported");
         return -EINVAL;
     } else if (offset > SD_MAX_VDI_SIZE) {
@@ -1783,6 +1784,7 @@ static int sd_truncate(BlockDriverState *bs, int64_t offset)
 
     fd = connect_to_sdog(s);
     if (fd < 0) {
+        error_report("failed to connected to sheep");
         return fd;
     }