objlayout.h

/*
 *  Data types and function declerations for interfacing with the
 *  pNFS standard object layout driver.
 *
 *  Copyright (C) 2007 Panasas Inc. [year of first publication]
 *  All rights reserved.
 *
 *  Benny Halevy <bhalevy@panasas.com>
 *  Boaz Harrosh <bharrosh@panasas.com>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2
 *  See the file COPYING included with this distribution for more details.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions
 *  are met:
 *
 *  1. Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *  3. Neither the name of the Panasas company nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
 *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef _OBJLAYOUT_H
#define _OBJLAYOUT_H

#include <linux/nfs_fs.h>
#include <linux/pnfs_osd_xdr.h>
#include "../pnfs.h"

/*
 * per-inode layout
 */
struct objlayout {
	struct pnfs_layout_hdr pnfs_layout;
};

static inline struct objlayout *
OBJLAYOUT(struct pnfs_layout_hdr *lo)
{
	return container_of(lo, struct objlayout, pnfs_layout);
}

/*
 * Raid engine I/O API
 */
extern int objio_alloc_lseg(struct pnfs_layout_segment **outp,
	struct pnfs_layout_hdr *pnfslay,
	struct pnfs_layout_range *range,
	struct xdr_stream *xdr,
	gfp_t gfp_flags);
extern void objio_free_lseg(struct pnfs_layout_segment *lseg);

/*
 * callback API
 */
extern int objlayout_get_deviceinfo(struct pnfs_layout_hdr *pnfslay,
	struct nfs4_deviceid *d_id, struct pnfs_osd_deviceaddr **deviceaddr,
	gfp_t gfp_flags);
extern void objlayout_put_deviceinfo(struct pnfs_osd_deviceaddr *deviceaddr);

/*
 * exported generic objects function vectors
 */

extern struct pnfs_layout_hdr *objlayout_alloc_layout_hdr(struct inode *, gfp_t gfp_flags);
extern void objlayout_free_layout_hdr(struct pnfs_layout_hdr *);

extern struct pnfs_layout_segment *objlayout_alloc_lseg(
	struct pnfs_layout_hdr *,
	struct nfs4_layoutget_res *,
	gfp_t gfp_flags);
extern void objlayout_free_lseg(struct pnfs_layout_segment *);

#endif /* _OBJLAYOUT_H */