cifs: use posix_unblock_lock instead of locks_delete_block
commit 66189be7 (CIFS: Fix VFS lock usage for oplocked files) exported the locks_delete_block symbol. There's already an exported helper function that provides this capability however, so make cifs use that instead and turn locks_delete_block back into a static function. Note that if fl->fl_next == NULL then this lock has already been through locks_delete_block(), so we should be OK to ignore an ENOENT error here and simply not retry the lock. Cc: Pavel Shilovsky <piastryyy@gmail.com> Signed-off-by: NJeff Layton <jlayton@redhat.com> Acked-by: NJ. Bruce Fields <bfields@fieldses.org> Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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