projects / thirdparty / xfsprogs-dev.git / blame
| Commit | Line | Data |
|---|---|---|
| 2bd0ea18 | 1 | /* |
| 0d3e0b37 | 2 | * Copyright (c) 2000-2001 Silicon Graphics, Inc. All Rights Reserved. |
| dfc130f3 | 3 | * |
| 2bd0ea18 NS |
4 | * This program is free software; you can redistribute it and/or modify it |
| 5 | * under the terms of version 2 of the GNU General Public License as | |
| 6 | * published by the Free Software Foundation. | |
| dfc130f3 | 7 | * |
| 2bd0ea18 NS |
8 | * This program is distributed in the hope that it would be useful, but |
| 9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
| dfc130f3 | 11 | * |
| 2bd0ea18 NS |
12 | * Further, this software is distributed without any warranty that it is |
| 13 | * free of the rightful claim of any third person regarding infringement | |
| 14 | * or the like. Any license provided herein, whether implied or | |
| 15 | * otherwise, applies only to this software file. Patent licenses, if | |
| 16 | * any, provided herein do not apply to combinations of this program with | |
| 17 | * other software, or any other product whatsoever. | |
| dfc130f3 | 18 | * |
| 2bd0ea18 NS |
19 | * You should have received a copy of the GNU General Public License along |
| 20 | * with this program; if not, write the Free Software Foundation, Inc., 59 | |
| 21 | * Temple Place - Suite 330, Boston MA 02111-1307, USA. | |
| dfc130f3 | 22 | * |
| 2bd0ea18 NS |
23 | * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy, |
| 24 | * Mountain View, CA 94043, or: | |
| dfc130f3 RC |
25 | * |
| 26 | * http://www.sgi.com | |
| 27 | * | |
| 28 | * For further information regarding this notice, see: | |
| 29 | * | |
| 2bd0ea18 NS |
30 | * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/ |
| 31 | */ | |
| 32 | ||
| 1d7e80ee | 33 | #include <xfs/libxfs.h> |
| 2bd0ea18 | 34 | #include "bmap.h" |
| 2bd0ea18 NS |
35 | #include "dbread.h" |
| 36 | #include "io.h" | |
| 4ca431fc | 37 | #include "init.h" |
| 2bd0ea18 NS |
38 | |
| 39 | int | |
| 40 | dbread(void *buf, int nblocks, xfs_fileoff_t bno, int whichfork) | |
| 41 | { | |
| 42 | bmap_ext_t bm; | |
| 43 | char *bp; | |
| 44 | xfs_dfiloff_t eb; | |
| 45 | xfs_dfiloff_t end; | |
| 46 | int i; | |
| 47 | int nex; | |
| 48 | ||
| 49 | nex = 1; | |
| 50 | end = bno + nblocks; | |
| 51 | bp = buf; | |
| 52 | while (bno < end) { | |
| 53 | bmap(bno, end - bno, whichfork, &nex, &bm); | |
| 54 | if (nex == 0) { | |
| 55 | bm.startoff = end; | |
| 56 | bm.blockcount = 1; | |
| 57 | } | |
| 58 | if (bm.startoff > bno) { | |
| 59 | eb = end < bm.startoff ? end : bm.startoff; | |
| 60 | i = (int)XFS_FSB_TO_B(mp, eb - bno); | |
| 61 | memset(bp, 0, i); | |
| 62 | bp += i; | |
| 63 | bno = eb; | |
| 64 | } | |
| 65 | if (bno == end) | |
| 66 | break; | |
| 67 | if (bno > bm.startoff) { | |
| 68 | bm.blockcount -= bno - bm.startoff; | |
| 69 | bm.startblock += bno - bm.startoff; | |
| 70 | bm.startoff = bno; | |
| 71 | } | |
| 72 | if (bm.startoff + bm.blockcount > end) | |
| 73 | bm.blockcount = end - bm.startoff; | |
| 74 | i = read_bbs(XFS_FSB_TO_DADDR(mp, bm.startblock), | |
| 75 | (int)XFS_FSB_TO_BB(mp, bm.blockcount), | |
| 76 | (void **)&bp, NULL); | |
| 77 | if (i) | |
| 78 | return i; | |
| 79 | bp += XFS_FSB_TO_B(mp, bm.blockcount); | |
| 80 | bno += bm.blockcount; | |
| 81 | } | |
| 82 | return 0; | |
| 83 | } |