| /* |
| * 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); |
| } |
| |
| /* |
| * per-I/O operation state |
| * embedded in objects provider io_state data structure |
| */ |
| struct objlayout_io_state { |
| struct pnfs_layout_segment *lseg; |
| |
| struct page **pages; |
| unsigned pgbase; |
| unsigned nr_pages; |
| unsigned long count; |
| loff_t offset; |
| bool sync; |
| |
| void *rpcdata; |
| int status; /* res */ |
| int eof; /* res */ |
| int committed; /* res */ |
| }; |
| |
| /* |
| * 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); |
| |
| extern int objio_alloc_io_state( |
| struct pnfs_layout_segment *lseg, |
| struct objlayout_io_state **outp, |
| gfp_t gfp_flags); |
| extern void objio_free_io_state(struct objlayout_io_state *state); |
| |
| extern ssize_t objio_read_pagelist(struct objlayout_io_state *ol_state); |
| extern ssize_t objio_write_pagelist(struct objlayout_io_state *ol_state, |
| bool stable); |
| |
| /* |
| * callback API |
| */ |
| extern void objlayout_read_done(struct objlayout_io_state *state, |
| ssize_t status, bool sync); |
| extern void objlayout_write_done(struct objlayout_io_state *state, |
| ssize_t status, bool sync); |
| |
| 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 *); |
| |
| extern enum pnfs_try_status objlayout_read_pagelist( |
| struct nfs_read_data *); |
| |
| extern enum pnfs_try_status objlayout_write_pagelist( |
| struct nfs_write_data *, |
| int how); |
| |
| #endif /* _OBJLAYOUT_H */ |