Hi, >From some stack overflow result I know that on a local ext4/fat32 system, we can test whether a file descriptor is valid through "fcntl(fd, F_GETFD)". But in cifs cases, a fd typically bind a local fd to remote handle, do we have some c function/syscall that can test whether the fd is remotely closed? I've tried some windows way like "ioctl", which works well, and in linux local file system "fcntl" works. Tried to use "fcntl" on kernel 5.1.15, found no server request is received.. Could you please give me some advice on testing whether a fd is remoted closed in CIFS client? Appreciate for your help! Best Regards, Gefei
