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block/cow.c: fix warnings with _FORTIFY_SOURCE

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CC    block/cow.o
cc1: warnings being treated as errors
block/cow.c: In function 'cow_create':
block/cow.c:251: error: ignoring return value of 'write', declared with attribute warn_unused_result
block/cow.c:253: error: ignoring return value of 'ftruncate', declared with attribute warn_unused_result
make: *** [block/cow.o] Error 1

Signed-off-by: Kirill A. Shutemov <kirill@shutemov.name>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Kirill A. Shutemov 2010-01-20 00:56:11 +01:00 committed by Anthony Liguori
parent 4817d32757
commit 31f38120a9
1 changed files with 16 additions and 3 deletions
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19
block/cow.c
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@ -209,6 +209,7 @@ static int cow_create(const char *filename, QEMUOptionParameter *options)
struct stat st;
int64_t image_sectors = 0;
const char *image_filename = NULL;
int ret;
/* Read out options */
while (options && options->name) {
@ -248,11 +249,23 @@ static int cow_create(const char *filename, QEMUOptionParameter *options)
}
cow_header.sectorsize = cpu_to_be32(512);
cow_header.size = cpu_to_be64(image_sectors * 512);
write(cow_fd, &cow_header, sizeof(cow_header));
ret = qemu_write_full(cow_fd, &cow_header, sizeof(cow_header));
if (ret != sizeof(cow_header)) {
ret = -1;
goto exit;
}
/* resize to include at least all the bitmap */
ftruncate(cow_fd, sizeof(cow_header) + ((image_sectors + 7) >> 3));
ret = ftruncate(cow_fd, sizeof(cow_header) + ((image_sectors + 7) >> 3));
if (ret) {
ret = -errno;
goto exit;
}
ret = 0;
exit:
close(cow_fd);
return 0;
return ret;
}
static void cow_flush(BlockDriverState *bs)