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04f8345038
With the use of the in-kernel osd library. Implement read/write
of data from/to osd-objects according to information specified
in the objects-layout.
Support for stripping over mirrors with a received stripe_unit.
There are however a few constrains which are not supported:
1. Stripe Unit must be a multiple of PAGE_SIZE
2. stripe length (stripe_unit * number_of_stripes) can not be
bigger then 32bit.
Also support raid-groups and partial-layout. Partial-layout is
when not all the groups are received on the line, addressing
only a partial range of the file.
TODO:
Only raid0! raid 4/5/6 support will come at later stage
A none supported layout will send IO through the MDS
[Important fallout from the last rebase]
Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
[gfp_flags]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
135 lines
4.3 KiB
C
135 lines
4.3 KiB
C
/*
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* Data types and function declerations for interfacing with the
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* pNFS standard object layout driver.
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*
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* Copyright (C) 2007 Panasas Inc. [year of first publication]
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* All rights reserved.
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*
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* Benny Halevy <bhalevy@panasas.com>
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* Boaz Harrosh <bharrosh@panasas.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* See the file COPYING included with this distribution for more details.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Panasas company nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _OBJLAYOUT_H
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#define _OBJLAYOUT_H
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#include <linux/nfs_fs.h>
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#include <linux/pnfs_osd_xdr.h>
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#include "../pnfs.h"
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/*
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* per-inode layout
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*/
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struct objlayout {
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struct pnfs_layout_hdr pnfs_layout;
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};
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static inline struct objlayout *
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OBJLAYOUT(struct pnfs_layout_hdr *lo)
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{
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return container_of(lo, struct objlayout, pnfs_layout);
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}
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/*
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* per-I/O operation state
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* embedded in objects provider io_state data structure
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*/
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struct objlayout_io_state {
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struct pnfs_layout_segment *lseg;
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struct page **pages;
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unsigned pgbase;
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unsigned nr_pages;
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unsigned long count;
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loff_t offset;
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bool sync;
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void *rpcdata;
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int status; /* res */
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int eof; /* res */
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int committed; /* res */
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};
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/*
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* Raid engine I/O API
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*/
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extern int objio_alloc_lseg(struct pnfs_layout_segment **outp,
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struct pnfs_layout_hdr *pnfslay,
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struct pnfs_layout_range *range,
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struct xdr_stream *xdr,
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gfp_t gfp_flags);
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extern void objio_free_lseg(struct pnfs_layout_segment *lseg);
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extern int objio_alloc_io_state(
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struct pnfs_layout_segment *lseg,
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struct objlayout_io_state **outp,
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gfp_t gfp_flags);
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extern void objio_free_io_state(struct objlayout_io_state *state);
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extern ssize_t objio_read_pagelist(struct objlayout_io_state *ol_state);
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extern ssize_t objio_write_pagelist(struct objlayout_io_state *ol_state,
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bool stable);
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/*
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* callback API
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*/
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extern void objlayout_read_done(struct objlayout_io_state *state,
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ssize_t status, bool sync);
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extern void objlayout_write_done(struct objlayout_io_state *state,
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ssize_t status, bool sync);
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extern int objlayout_get_deviceinfo(struct pnfs_layout_hdr *pnfslay,
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struct nfs4_deviceid *d_id, struct pnfs_osd_deviceaddr **deviceaddr,
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gfp_t gfp_flags);
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extern void objlayout_put_deviceinfo(struct pnfs_osd_deviceaddr *deviceaddr);
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/*
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* exported generic objects function vectors
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*/
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extern struct pnfs_layout_hdr *objlayout_alloc_layout_hdr(struct inode *, gfp_t gfp_flags);
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extern void objlayout_free_layout_hdr(struct pnfs_layout_hdr *);
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extern struct pnfs_layout_segment *objlayout_alloc_lseg(
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struct pnfs_layout_hdr *,
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struct nfs4_layoutget_res *,
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gfp_t gfp_flags);
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extern void objlayout_free_lseg(struct pnfs_layout_segment *);
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extern enum pnfs_try_status objlayout_read_pagelist(
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struct nfs_read_data *);
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extern enum pnfs_try_status objlayout_write_pagelist(
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struct nfs_write_data *,
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int how);
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#endif /* _OBJLAYOUT_H */
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