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pnfs-obj: decode layout, alloc/free lseg

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objlayout_alloc_lseg prepares an xdr_stream and calls the
raid engins objio_alloc_lseg() to allocate a private
pnfs_layout_segment.

objio_osd.c::objio_alloc_lseg() uses passed xdr_stream to
decode and store the layout_segment information in an
objio_segment struct, using the pnfs_osd_xdr.h API for
the actual parsing the layout xdr.

objlayout_free_lseg calls objio_free_lseg() to free the
allocated space.

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
[gfp_flags]
[removed "extern" from function definitions]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
This commit is contained in:
Boaz Harrosh
2011-05-22 19:50:20 +03:00
parent f1bc893a89
commit 09f5bf4e6d
4 changed files with 341 additions and 2 deletions
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104
fs/nfs/objlayout/objlayout.c Normal file
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@@ -0,0 +1,104 @@
/*
* pNFS Objects layout driver high level definitions
*
* 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.
*/
#include <scsi/osd_initiator.h>
#include "objlayout.h"
#define NFSDBG_FACILITY NFSDBG_PNFS_LD
/*
* Unmarshall layout and store it in pnfslay.
*/
struct pnfs_layout_segment *
objlayout_alloc_lseg(struct pnfs_layout_hdr *pnfslay,
struct nfs4_layoutget_res *lgr,
gfp_t gfp_flags)
{
int status = -ENOMEM;
struct xdr_stream stream;
struct xdr_buf buf = {
.pages = lgr->layoutp->pages,
.page_len = lgr->layoutp->len,
.buflen = lgr->layoutp->len,
.len = lgr->layoutp->len,
};
struct page *scratch;
struct pnfs_layout_segment *lseg;
dprintk("%s: Begin pnfslay %p\n", __func__, pnfslay);
scratch = alloc_page(gfp_flags);
if (!scratch)
goto err_nofree;
xdr_init_decode(&stream, &buf, NULL);
xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
status = objio_alloc_lseg(&lseg, pnfslay, &lgr->range, &stream, gfp_flags);
if (unlikely(status)) {
dprintk("%s: objio_alloc_lseg Return err %d\n", __func__,
status);
goto err;
}
__free_page(scratch);
dprintk("%s: Return %p\n", __func__, lseg);
return lseg;
err:
__free_page(scratch);
err_nofree:
dprintk("%s: Err Return=>%d\n", __func__, status);
return ERR_PTR(status);
}
/*
* Free a layout segement
*/
void
objlayout_free_lseg(struct pnfs_layout_segment *lseg)
{
dprintk("%s: freeing layout segment %p\n", __func__, lseg);
if (unlikely(!lseg))
return;
objio_free_lseg(lseg);
}