/*
 * GPL HEADER START
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 only,
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License version 2 for more details (a copy is included
 * in the LICENSE file that accompanied this code).
 *
 * You should have received a copy of the GNU General Public License
 * version 2 along with this program; If not, see
 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 *
 * GPL HEADER END
 */
/*
 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
 * Use is subject to license terms.
 *
 * Copyright (c) 2011, 2012, Intel Corporation.
 */
/*
 * This file is part of Lustre, http://www.lustre.org/
 * Lustre is a trademark of Sun Microsystems, Inc.
 *
 * lustre/obdclass/linux/linux-obdo.c
 *
 * Object Devices Class Driver
 * These are the only exported functions, they provide some generic
 * infrastructure for managing object devices
 */

#define DEBUG_SUBSYSTEM S_CLASS

#include <linux/module.h>
#include "../../include/obd_class.h"
#include "../../include/lustre/lustre_idl.h"

#include <linux/fs.h>
#include <linux/pagemap.h> /* for PAGE_CACHE_SIZE */

/*FIXME: Just copy from obdo_from_inode*/
void obdo_from_la(struct obdo *dst, struct lu_attr *la, __u64 valid)
{
	u32 newvalid = 0;

	if (valid & LA_ATIME) {
		dst->o_atime = la->la_atime;
		newvalid |= OBD_MD_FLATIME;
	}
	if (valid & LA_MTIME) {
		dst->o_mtime = la->la_mtime;
		newvalid |= OBD_MD_FLMTIME;
	}
	if (valid & LA_CTIME) {
		dst->o_ctime = la->la_ctime;
		newvalid |= OBD_MD_FLCTIME;
	}
	if (valid & LA_SIZE) {
		dst->o_size = la->la_size;
		newvalid |= OBD_MD_FLSIZE;
	}
	if (valid & LA_BLOCKS) {  /* allocation of space (x512 bytes) */
		dst->o_blocks = la->la_blocks;
		newvalid |= OBD_MD_FLBLOCKS;
	}
	if (valid & LA_TYPE) {
		dst->o_mode = (dst->o_mode & S_IALLUGO) |
			      (la->la_mode & S_IFMT);
		newvalid |= OBD_MD_FLTYPE;
	}
	if (valid & LA_MODE) {
		dst->o_mode = (dst->o_mode & S_IFMT) |
			      (la->la_mode & S_IALLUGO);
		newvalid |= OBD_MD_FLMODE;
	}
	if (valid & LA_UID) {
		dst->o_uid = la->la_uid;
		newvalid |= OBD_MD_FLUID;
	}
	if (valid & LA_GID) {
		dst->o_gid = la->la_gid;
		newvalid |= OBD_MD_FLGID;
	}
	dst->o_valid |= newvalid;
}
EXPORT_SYMBOL(obdo_from_la);

/*FIXME: Just copy from obdo_from_inode*/
void la_from_obdo(struct lu_attr *dst, struct obdo *obdo, u32 valid)
{
	__u64 newvalid = 0;

	valid &= obdo->o_valid;

	if (valid & OBD_MD_FLATIME) {
		dst->la_atime = obdo->o_atime;
		newvalid |= LA_ATIME;
	}
	if (valid & OBD_MD_FLMTIME) {
		dst->la_mtime = obdo->o_mtime;
		newvalid |= LA_MTIME;
	}
	if (valid & OBD_MD_FLCTIME) {
		dst->la_ctime = obdo->o_ctime;
		newvalid |= LA_CTIME;
	}
	if (valid & OBD_MD_FLSIZE) {
		dst->la_size = obdo->o_size;
		newvalid |= LA_SIZE;
	}
	if (valid & OBD_MD_FLBLOCKS) {
		dst->la_blocks = obdo->o_blocks;
		newvalid |= LA_BLOCKS;
	}
	if (valid & OBD_MD_FLTYPE) {
		dst->la_mode = (dst->la_mode & S_IALLUGO) |
			       (obdo->o_mode & S_IFMT);
		newvalid |= LA_TYPE;
	}
	if (valid & OBD_MD_FLMODE) {
		dst->la_mode = (dst->la_mode & S_IFMT) |
			       (obdo->o_mode & S_IALLUGO);
		newvalid |= LA_MODE;
	}
	if (valid & OBD_MD_FLUID) {
		dst->la_uid = obdo->o_uid;
		newvalid |= LA_UID;
	}
	if (valid & OBD_MD_FLGID) {
		dst->la_gid = obdo->o_gid;
		newvalid |= LA_GID;
	}
	dst->la_valid = newvalid;
}
EXPORT_SYMBOL(la_from_obdo);

void obdo_refresh_inode(struct inode *dst, struct obdo *src, u32 valid)
{
	valid &= src->o_valid;

	if (valid & (OBD_MD_FLCTIME | OBD_MD_FLMTIME))
		CDEBUG(D_INODE,
		       "valid %#llx, cur time %lu/%lu, new %llu/%llu\n",
		       src->o_valid, LTIME_S(dst->i_mtime),
		       LTIME_S(dst->i_ctime), src->o_mtime, src->o_ctime);

	if (valid & OBD_MD_FLATIME && src->o_atime > LTIME_S(dst->i_atime))
		LTIME_S(dst->i_atime) = src->o_atime;
	if (valid & OBD_MD_FLMTIME && src->o_mtime > LTIME_S(dst->i_mtime))
		LTIME_S(dst->i_mtime) = src->o_mtime;
	if (valid & OBD_MD_FLCTIME && src->o_ctime > LTIME_S(dst->i_ctime))
		LTIME_S(dst->i_ctime) = src->o_ctime;
	if (valid & OBD_MD_FLSIZE)
		i_size_write(dst, src->o_size);
	/* optimum IO size */
	if (valid & OBD_MD_FLBLKSZ && src->o_blksize > (1 << dst->i_blkbits))
		dst->i_blkbits = ffs(src->o_blksize) - 1;

	if (dst->i_blkbits < PAGE_CACHE_SHIFT)
		dst->i_blkbits = PAGE_CACHE_SHIFT;

	/* allocation of space */
	if (valid & OBD_MD_FLBLOCKS && src->o_blocks > dst->i_blocks)
		/*
		 * XXX shouldn't overflow be checked here like in
		 * obdo_to_inode().
		 */
		dst->i_blocks = src->o_blocks;
}
EXPORT_SYMBOL(obdo_refresh_inode);

void obdo_to_inode(struct inode *dst, struct obdo *src, u32 valid)
{
	valid &= src->o_valid;

	LASSERTF(!(valid & (OBD_MD_FLTYPE | OBD_MD_FLGENER | OBD_MD_FLFID |
			    OBD_MD_FLID | OBD_MD_FLGROUP)),
		 "object "DOSTID", valid %x\n", POSTID(&src->o_oi), valid);

	if (valid & (OBD_MD_FLCTIME | OBD_MD_FLMTIME))
		CDEBUG(D_INODE,
		       "valid %#llx, cur time %lu/%lu, new %llu/%llu\n",
		       src->o_valid, LTIME_S(dst->i_mtime),
		       LTIME_S(dst->i_ctime), src->o_mtime, src->o_ctime);

	if (valid & OBD_MD_FLATIME)
		LTIME_S(dst->i_atime) = src->o_atime;
	if (valid & OBD_MD_FLMTIME)
		LTIME_S(dst->i_mtime) = src->o_mtime;
	if (valid & OBD_MD_FLCTIME && src->o_ctime > LTIME_S(dst->i_ctime))
		LTIME_S(dst->i_ctime) = src->o_ctime;
	if (valid & OBD_MD_FLSIZE)
		i_size_write(dst, src->o_size);
	if (valid & OBD_MD_FLBLOCKS) { /* allocation of space */
		dst->i_blocks = src->o_blocks;
		if (dst->i_blocks < src->o_blocks) /* overflow */
			dst->i_blocks = -1;

	}
	if (valid & OBD_MD_FLBLKSZ)
		dst->i_blkbits = ffs(src->o_blksize)-1;
	if (valid & OBD_MD_FLMODE)
		dst->i_mode = (dst->i_mode & S_IFMT) | (src->o_mode & ~S_IFMT);
	if (valid & OBD_MD_FLUID)
		dst->i_uid = make_kuid(&init_user_ns, src->o_uid);
	if (valid & OBD_MD_FLGID)
		dst->i_gid = make_kgid(&init_user_ns, src->o_gid);
	if (valid & OBD_MD_FLFLAGS)
		dst->i_flags = src->o_flags;
}
EXPORT_SYMBOL(obdo_to_inode);