| /* |
| * 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); |
| } |
| |