If the command with sync option finishes succesfully, the subvolume(s)
deletion status is safely stored on the media.
+ if (sync_mode == 1) {
+ res = ioctl(fd, BTRFS_IOC_SYNC);
+ if (res < 0) {
+ fprintf(stderr,
+ "ERROR: unable to sync after '%s': %s\n",
+ path, strerror(e));
+ ret = 1;
+ }
+ }
+
generalized sync isn't too viable option in all production environment
as it would disturb the steady state performance in some environment.
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