ocfs2_dlmfs: Add capabilities parameter.

	.pv_minor = OCFS2_LOCKING_PROTOCOL_MINOR,

};

/*

 * These are the ABI capabilities of dlmfs.

 *

 * Over time, dlmfs has added some features that were not part of the

 * initial ABI.  Unfortunately, some of these features are not detectable

 * via standard usage.  For example, Linux's default poll always returns

 * POLLIN, so there is no way for a caller of poll(2) to know when dlmfs

 * added poll support.  Instead, we provide this list of new capabilities.

 *

 * Capabilities is a read-only attribute.  We do it as a module parameter

 * so we can discover it whether dlmfs is built in, loaded, or even not

 * loaded.

 *

 * The ABI features are local to this machine's dlmfs mount.  This is

 * distinct from the locking protocol, which is concerned with inter-node

 * interaction.

 */

#define DLMFS_CAPABILITIES ""

extern int param_set_dlmfs_capabilities(const char *val,

					struct kernel_param *kp)

{

	printk(KERN_ERR "%s: readonly parameter\n", kp->name);

	return -EINVAL;

}

static int param_get_dlmfs_capabilities(char *buffer,

					struct kernel_param *kp)

{

	return strlcpy(buffer, DLMFS_CAPABILITIES,

		       strlen(DLMFS_CAPABILITIES) + 1);

}

module_param_call(capabilities, param_set_dlmfs_capabilities,

		  param_get_dlmfs_capabilities, NULL, 0444);

MODULE_PARM_DESC(capabilities, DLMFS_CAPABILITIES);

/*

 * decodes a set of open flags into a valid lock level and a set of flags.

 * returns < 0 if we have invalid flags