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Xiong Zhou authored
Test OFD locks. Use fcntl F_OFD_SETLK/F_OFD_GETLK, to verify we are being given correct advices through getlk by kernel. The basic idea is one setlk routine setting locks via fcntl *_SETLK, followed by operations like clone, dup then close fd; another routine getlk getting locks via fcntl *_GETLK. Firstly in setlk routine process P0, place a lock L0 on an opened testfile, then do clone or dup and close relative fd. In getlk process P2, do fcntl *_GETLK with lock L1 after get notified by setlk routine. In the end, getlk routine check the returned struct flock.l_type to see if the lock mechanism works fine. Test combainations of: - shared or exclusive lock - these locks are conflicting or not - one OFD lock and one POSIX lock - that open testfile RDONLY or RDWR - clone with CLONE_FILES or not - dup and close newfd [eguan: made some minor non-functional changes] Signed-off-by: Xiong Zhou <xzhou@redhat.com> Reviewed-by: Eryu Guan <eguan@redhat.com> Signed-off-by: Eryu Guan <eguan@redhat.com>
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