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2bd0ea18 | 1 | /* |
da23017d NS |
2 | * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc. |
3 | * All Rights Reserved. | |
dfc130f3 | 4 | * |
da23017d NS |
5 | * This program is free software; you can redistribute it and/or |
6 | * modify it under the terms of the GNU General Public License as | |
2bd0ea18 | 7 | * published by the Free Software Foundation. |
dfc130f3 | 8 | * |
da23017d NS |
9 | * This program is distributed in the hope that it would be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
dfc130f3 | 13 | * |
da23017d NS |
14 | * You should have received a copy of the GNU General Public License |
15 | * along with this program; if not, write the Free Software Foundation, | |
16 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
2bd0ea18 NS |
17 | */ |
18 | ||
1d7e80ee | 19 | #include <xfs/libxfs.h> |
2bd0ea18 | 20 | #include "bmap.h" |
2bd0ea18 NS |
21 | #include "dbread.h" |
22 | #include "io.h" | |
4ca431fc | 23 | #include "init.h" |
2bd0ea18 NS |
24 | |
25 | int | |
26 | dbread(void *buf, int nblocks, xfs_fileoff_t bno, int whichfork) | |
27 | { | |
28 | bmap_ext_t bm; | |
29 | char *bp; | |
30 | xfs_dfiloff_t eb; | |
31 | xfs_dfiloff_t end; | |
32 | int i; | |
33 | int nex; | |
34 | ||
35 | nex = 1; | |
36 | end = bno + nblocks; | |
37 | bp = buf; | |
38 | while (bno < end) { | |
39 | bmap(bno, end - bno, whichfork, &nex, &bm); | |
40 | if (nex == 0) { | |
41 | bm.startoff = end; | |
42 | bm.blockcount = 1; | |
43 | } | |
44 | if (bm.startoff > bno) { | |
45 | eb = end < bm.startoff ? end : bm.startoff; | |
46 | i = (int)XFS_FSB_TO_B(mp, eb - bno); | |
47 | memset(bp, 0, i); | |
48 | bp += i; | |
49 | bno = eb; | |
50 | } | |
51 | if (bno == end) | |
52 | break; | |
53 | if (bno > bm.startoff) { | |
54 | bm.blockcount -= bno - bm.startoff; | |
55 | bm.startblock += bno - bm.startoff; | |
56 | bm.startoff = bno; | |
57 | } | |
58 | if (bm.startoff + bm.blockcount > end) | |
59 | bm.blockcount = end - bm.startoff; | |
60 | i = read_bbs(XFS_FSB_TO_DADDR(mp, bm.startblock), | |
61 | (int)XFS_FSB_TO_BB(mp, bm.blockcount), | |
62 | (void **)&bp, NULL); | |
63 | if (i) | |
64 | return i; | |
65 | bp += XFS_FSB_TO_B(mp, bm.blockcount); | |
66 | bno += bm.blockcount; | |
67 | } | |
68 | return 0; | |
69 | } |