tree a11964dfe24dbc4c7ef5fdc6c34abc4de325b187
parent 6f993f3fca4763a6b494ff587d4400b6e8a5ef31
author Nir Soffer <nirsof@gmail.com> 1487292686 +0200
committer Kevin Wolf <kwolf@redhat.com> 1487948963 +0100

qemu-img: Truncate before full preallocation

In a previous commit (qemu-img: Do not truncate before preallocation) we
moved truncate to the PREALLOC_MODE_OFF branch to avoid slowdown in
posix_fallocate().

However this change is not optimal when using PREALLOC_MODE_FULL, since
knowing the final size from the beginning could allow the file system
driver to do less allocations and possibly avoid fragmentation of the
file.

Now we truncate also before doing full preallocation.

Signed-off-by: Nir Soffer <nirsof@gmail.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>