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From: Aa Aa <jimbothom@yandex.com>
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Date: Mon, 20 Jul 2020 17:54:46 +1000
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Subject: [Virtio-fs] F_SETLKW not supported
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To: virtio-fs@redhat.com

Hi

I am trying to run some java apps via virtfs and some of the file locking (java) doesn't work. Here an exception (java) is thrown something about file locking:

Here is the strace output:

 3541 [pid 12461] openat(AT_FDCWD, "/mnt/<redacted> O_WRONLY|O_CREAT|O_APPEND, 0666 <unfinished ...>
 3542 [pid 12461] <... openat resumed>)       = 180
 3543 [pid 12461] fstat(180, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
 3544 [pid 12461] fcntl(180, F_SETLKW, {l_type=F_WRLCK, l_whence=SEEK_SET, l_start=0, l_len=0} <unfinished ...>
 3545 [pid 12461] <... fcntl resumed>)        = -1 EOPNOTSUPP (Operation not supported)

If I run this on the native file system, there is no issue. Should this functl be supported?

Cheers

JT