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Re: [Linux-cluster] GFS bug with fcntl/flock ?



Robert Hurst wrote:
I am running InterSystems Caché 5.0.19 for AMD64, and an strace output from their utility reveals a problem with fcntl/flock on the GFS filesystem (mount -t gfs /dev/VGSHARE/lvol0 /usr/local):

    open("/usr/local/etc/cachesys/cache.reg", O_RDONLY|O_NONBLOCK) = 3
    fcntl(3, F_SETLKW, {type=F_RDLCK, whence=SEEK_SET, start=0,
    len=0}) = -1 ENOLCK (No locks available)


When I put their files on an ordinary ext3 filesystem, all works fine:

    open("/usr/local/etc/cachesys/cache.reg", O_RDONLY|O_NONBLOCK) = 3
    fcntl(3, F_SETLKW, {type=F_RDLCK, whence=SEEK_SET, start=0,
    len=0}) = 0


The man page on fcntl states that when flock is setup with whence=SEEK_SET, start=0, and len=0, the lock will occur on the entire file... so locking zero bytes in this manner is acceptable. Help?
Hi Robert,

What version of the cluster software and GFS are you using?

Regards,

Bob Peterson
Red Hat CLuster Suite


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