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09f5bf4e6d
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>
105 lines
3.3 KiB
C
105 lines
3.3 KiB
C
/*
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* pNFS Objects layout driver high level definitions
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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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#include <scsi/osd_initiator.h>
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#include "objlayout.h"
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#define NFSDBG_FACILITY NFSDBG_PNFS_LD
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/*
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* Unmarshall layout and store it in pnfslay.
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*/
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struct pnfs_layout_segment *
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objlayout_alloc_lseg(struct pnfs_layout_hdr *pnfslay,
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struct nfs4_layoutget_res *lgr,
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gfp_t gfp_flags)
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{
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int status = -ENOMEM;
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struct xdr_stream stream;
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struct xdr_buf buf = {
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.pages = lgr->layoutp->pages,
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.page_len = lgr->layoutp->len,
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.buflen = lgr->layoutp->len,
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.len = lgr->layoutp->len,
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};
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struct page *scratch;
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struct pnfs_layout_segment *lseg;
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dprintk("%s: Begin pnfslay %p\n", __func__, pnfslay);
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scratch = alloc_page(gfp_flags);
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if (!scratch)
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goto err_nofree;
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xdr_init_decode(&stream, &buf, NULL);
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xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
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status = objio_alloc_lseg(&lseg, pnfslay, &lgr->range, &stream, gfp_flags);
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if (unlikely(status)) {
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dprintk("%s: objio_alloc_lseg Return err %d\n", __func__,
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status);
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goto err;
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}
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__free_page(scratch);
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dprintk("%s: Return %p\n", __func__, lseg);
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return lseg;
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err:
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__free_page(scratch);
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err_nofree:
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dprintk("%s: Err Return=>%d\n", __func__, status);
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return ERR_PTR(status);
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}
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/*
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* Free a layout segement
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*/
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void
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objlayout_free_lseg(struct pnfs_layout_segment *lseg)
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{
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dprintk("%s: freeing layout segment %p\n", __func__, lseg);
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if (unlikely(!lseg))
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return;
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objio_free_lseg(lseg);
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}
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