On Mon, 29 Sep 2014 17:12:59 +0200
Kevin Wolf <kw...@redhat.com> wrote:
> Check for the presence of posix_fallocate() in configure and only
> compile in support for PREALLOC_MODE_FALLOC when it's there.
With this patch QEMU builds fine on OS X
Tested-By: Igor Mammedov <imamm...@redhat.com>
>
> Signed-off-by: Kevin Wolf <kw...@redhat.com>
> ---
> block/raw-posix.c | 18 ++++++++++++++----
> configure | 18 ++++++++++++++++++
> 2 files changed, 32 insertions(+), 4 deletions(-)
>
> diff --git a/block/raw-posix.c b/block/raw-posix.c
> index a253697..86ce4f2 100644
> --- a/block/raw-posix.c
> +++ b/block/raw-posix.c
> @@ -1416,16 +1416,21 @@ static int raw_create(const char *filename,
> QemuOpts *opts, Error **errp) goto out_close;
> }
>
> - if (prealloc == PREALLOC_MODE_FALLOC) {
> + switch (prealloc) {
> +#ifdef CONFIG_POSIX_FALLOCATE
> + case PREALLOC_MODE_FALLOC:
> /* posix_fallocate() doesn't set errno. */
> result = -posix_fallocate(fd, 0, total_size);
> if (result != 0) {
> error_setg_errno(errp, -result,
> "Could not preallocate data for the new
> file"); }
> - } else if (prealloc == PREALLOC_MODE_FULL) {
> - buf = g_malloc0(65536);
> + break;
> +#endif
> + case PREALLOC_MODE_FULL:
> + {
> int64_t num = 0, left = total_size;
> + buf = g_malloc0(65536);
>
> while (left > 0) {
> num = MIN(left, 65536);
> @@ -1440,10 +1445,15 @@ static int raw_create(const char *filename,
> QemuOpts *opts, Error **errp) }
> fsync(fd);
> g_free(buf);
> - } else if (prealloc != PREALLOC_MODE_OFF) {
> + break;
> + }
> + case PREALLOC_MODE_OFF:
> + break;
> + default:
> result = -EINVAL;
> error_setg(errp, "Unsupported preallocation mode: %s",
> PreallocMode_lookup[prealloc]);
> + break;
> }
>
> out_close:
> diff --git a/configure b/configure
> index a2c0f2a..681abfc 100755
> --- a/configure
> +++ b/configure
> @@ -3308,6 +3308,21 @@ if compile_prog "" "" ; then
> fallocate_punch_hole=yes
> fi
>
> +# check for posix_fallocate
> +posix_fallocate=no
> +cat > $TMPC << EOF
> +#include <fcntl.h>
> +
> +int main(void)
> +{
> + posix_fallocate(0, 0, 0);
> + return 0;
> +}
> +EOF
> +if compile_prog "" "" ; then
> + posix_fallocate=yes
> +fi
> +
> # check for sync_file_range
> sync_file_range=no
> cat > $TMPC << EOF
> @@ -4522,6 +4537,9 @@ fi
> if test "$fallocate_punch_hole" = "yes" ; then
> echo "CONFIG_FALLOCATE_PUNCH_HOLE=y" >> $config_host_mak
> fi
> +if test "$posix_fallocate" = "yes" ; then
> + echo "CONFIG_POSIX_FALLOCATE=y" >> $config_host_mak
> +fi
> if test "$sync_file_range" = "yes" ; then
> echo "CONFIG_SYNC_FILE_RANGE=y" >> $config_host_mak
> fi
