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  • Committer: Bazaar Package Importer
  • Author(s): Nathan Scott
  • Date: 2009-05-06 11:29:18 UTC
  • mfrom: (8.1.1 jaunty)
  • Revision ID: james.westby@ubuntu.com-20090506112918-uzoyzcp90rtr8td7
Tags: 3.0.2
New bugfix release

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db/dbread.c
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/*
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 * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
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 * All Rights Reserved.
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 *
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 * This program is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU General Public License as
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 * published by the Free Software Foundation.
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 *
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 * This program is distributed in the hope that it would be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write the Free Software Foundation,
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 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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 */
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#include <xfs/libxfs.h>
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#include "bmap.h"
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#include "dbread.h"
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#include "io.h"
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#include "init.h"
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int
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dbread(void *buf, int nblocks, xfs_fileoff_t bno, int whichfork)
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{
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        bmap_ext_t      bm;
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        char            *bp;
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        xfs_dfiloff_t   eb;
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        xfs_dfiloff_t   end;
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        int             i;
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        int             nex;
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        nex = 1;
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        end = bno + nblocks;
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        bp = buf;
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        while (bno < end) {
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                bmap(bno, end - bno, whichfork, &nex, &bm);
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                if (nex == 0) {
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                        bm.startoff = end;
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                        bm.blockcount = 1;
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                }
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                if (bm.startoff > bno) {
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                        eb = end < bm.startoff ? end : bm.startoff;
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                        i = (int)XFS_FSB_TO_B(mp, eb - bno);
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                        memset(bp, 0, i);
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                        bp += i;
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                        bno = eb;
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                }
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                if (bno == end)
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                        break;
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                if (bno > bm.startoff) {
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                        bm.blockcount -= bno - bm.startoff;
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                        bm.startblock += bno - bm.startoff;
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                        bm.startoff = bno;
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                }
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                if (bm.startoff + bm.blockcount > end)
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                        bm.blockcount = end - bm.startoff;
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                i = read_bbs(XFS_FSB_TO_DADDR(mp, bm.startblock),
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                             (int)XFS_FSB_TO_BB(mp, bm.blockcount),
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                             (void **)&bp, NULL);
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                if (i)
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                        return i;
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                bp += XFS_FSB_TO_B(mp, bm.blockcount);
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                bno += bm.blockcount;
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        }
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        return 0;
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}