diff options
| author | Denis V. Lunev | 2015-01-30 09:42:14 +0100 |
|---|---|---|
| committer | Kevin Wolf | 2015-02-06 17:24:20 +0100 |
| commit | b953f075007a7860adce9fa410b2e116a3d5e29c (patch) | |
| tree | a74183d720dfb65c01b65fc9acd93c9939f11f2e /configure | |
| parent | block/raw-posix: refactor handle_aiocb_write_zeroes a bit (diff) | |
| download | qemu-b953f075007a7860adce9fa410b2e116a3d5e29c.tar.gz qemu-b953f075007a7860adce9fa410b2e116a3d5e29c.tar.xz qemu-b953f075007a7860adce9fa410b2e116a3d5e29c.zip | |
block: use fallocate(FALLOC_FL_ZERO_RANGE) in handle_aiocb_write_zeroes
This efficiently writes zeroes on Linux if the kernel is capable enough.
FALLOC_FL_ZERO_RANGE correctly handles all cases, including and not
including file expansion.
CC: Kevin Wolf <kwolf@redhat.com>
CC: Stefan Hajnoczi <stefanha@redhat.com>
CC: Peter Lieven <pl@kamp.de>
CC: Fam Zheng <famz@redhat.com>
Signed-off-by: Denis V. Lunev <den@openvz.org>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'configure')
| -rwxr-xr-x | configure | 19 |
1 files changed, 19 insertions, 0 deletions
@@ -3335,6 +3335,22 @@ if compile_prog "" "" ; then fallocate_punch_hole=yes fi +# check that fallocate supports range zeroing inside the file +fallocate_zero_range=no +cat > $TMPC << EOF +#include <fcntl.h> +#include <linux/falloc.h> + +int main(void) +{ + fallocate(0, FALLOC_FL_ZERO_RANGE, 0, 0); + return 0; +} +EOF +if compile_prog "" "" ; then + fallocate_zero_range=yes +fi + # check for posix_fallocate posix_fallocate=no cat > $TMPC << EOF @@ -4567,6 +4583,9 @@ fi if test "$fallocate_punch_hole" = "yes" ; then echo "CONFIG_FALLOCATE_PUNCH_HOLE=y" >> $config_host_mak fi +if test "$fallocate_zero_range" = "yes" ; then + echo "CONFIG_FALLOCATE_ZERO_RANGE=y" >> $config_host_mak +fi if test "$posix_fallocate" = "yes" ; then echo "CONFIG_POSIX_FALLOCATE=y" >> $config_host_mak fi |