On Thu 30 Apr 2020 at 12:46:26 (-0400), Alberto Sentieri wrote:
> Apparently there is something wrong with the debian stretch utimensat
> system call, or with its interaction with cifs. It works as expected
> when the destination file is on a ext4 file system, but it does not
> work when the destination file is on a SMB file system.
>
> I wrote a simple C program, which I compiled with <gcc -g -o x2 x2.c>.
>
> On my debian buster workstation, I run the program using a script, which is:
>
> #!/bin/bash
> NAME='/mnt/u1/rw/receipt/test2.txt'
> rm -f "${NAME}"
> ls -ls "${NAME}"
> /mnt/1g/home/u1/data/cp-pi/x2 "${NAME}"
> ls -ls "${NAME}"
> sleep 1
> ls -ls "${NAME}"
>
> Note that the /mnt/u1/rw/receipt is a SMB folder. I got this result:
>
> $ ./do2.sh
> ls: cannot access '/mnt/u1/rw/receipt/test2.txt': No such file or directory
> 0 -rwxr-xr-x 1 u1 u1 10 Feb 5 2017 /mnt/u1/rw/receipt/test2.txt
> 1024 -rwxr-xr-x 1 u1 u1 10 Apr 30 12:20 /mnt/u1/rw/receipt/test2.txt
>
> As you can see, the time stamp changes after one second.
Perhaps it's more important that the time changes after the filesystem
has allocated some space for it.
(Repeat: I'm not familiar with cifs/smb protocols and filesystems.)
Cheers,
David.
