diff options
| -rw-r--r-- | block/cow.c | 19 |
1 files changed, 16 insertions, 3 deletions
diff --git a/block/cow.c b/block/cow.c index a70854e631..3733385840 100644 --- a/block/cow.c +++ b/block/cow.c @@ -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) |