On Tue, May 14, 2013 at 09:56:44PM +0800, Osier Yang wrote: > On 14/05/13 21:50, Christophe Fergeau wrote: > >qemu-img resize will fail with "The new size must be a multiple of 512" > >if libvirt doesn't round it first. > >This fixes rhbz#951495 > > > >Signed-off-by: Christophe Fergeau <cfergeau@xxxxxxxxxx> > >--- > > src/storage/storage_backend_fs.c | 4 ++++ > > 1 file changed, 4 insertions(+) > > > >diff --git a/src/storage/storage_backend_fs.c b/src/storage/storage_backend_fs.c > >index 9b83e57..99973b0 100644 > >--- a/src/storage/storage_backend_fs.c > >+++ b/src/storage/storage_backend_fs.c > >@@ -1219,6 +1219,10 @@ virStorageBackendFilesystemResizeQemuImg(const char *path, > > return -1; > > } > >+ /* Round capacity up to the closest 512 multiple as qemu-img errors out > >+ * on sizes which are not a multiple of 512 */ > >+ capacity = (capacity + 511) / 512 * 512; > > There is macro VIR_DIV_UP for the purpose. Ah thanks, I knew there had to be such a macro, but could not find it ;) > And should we document it somewhere? In v2 I've added a short blob about the rounding in virStorageVolResize API doc, hopefully that's a good place for that. Christophe
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