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btrfs-progs: improve error messages after failed wiping

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Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2016-03-14 14:18:32 +01:00
parent 2490de5da5
commit 230bb91aa8
1 changed files with 5 additions and 2 deletions
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7
utils.c
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@ -842,8 +842,11 @@ static int btrfs_wipe_existing_sb(int fd)
memset(buf, 0, len);
ret = pwrite(fd, buf, len, offset);
if (ret != len) {
fprintf(stderr, "ERROR: cannot wipe existing superblock\n");
if (ret < 0) {
error("cannot wipe existing superblock: %s", strerror(errno));
ret = -1;
} else if (ret != len) {
error("cannot wipe existing superblock: wrote %d of %zd", ret, len);
ret = -1;
}
fsync(fd);