Am 29.08.2014 um 10:33 hat Hu Tao geschrieben: > preallocation=full allocates disk space by fallocating the space if > posix_fallocate() is available, otherwise by writing zeros to disk to > ensure disk space in any cases. > > Signed-off-by: Hu Tao <hu...@cn.fujitsu.com> > --- > block/qcow2.c | 61 > +++++++++++++++++++++++++++++++++++++++------- > qemu-doc.texi | 7 +++--- > qemu-img.texi | 7 +++--- > tests/qemu-iotests/082.out | 54 ++++++++++++++++++++-------------------- > 4 files changed, 87 insertions(+), 42 deletions(-)
> + qemu_opt_set_number(opts, BLOCK_OPT_SIZE, > + aligned_total_size + meta_size); > + qemu_opt_set(opts, BLOCK_OPT_PREALLOC, > PreallocMode_lookup[prealloc]); > + } This means that if used with a protocol that doesn't have a preallocation option, it gets silently ignored. I'm not completely decided yet whether that's a bug or a feature. :-) Kevin
