ext2fs_subr.c revision 1.10 1 1.10 agc /* $NetBSD: ext2fs_subr.c,v 1.10 2003/08/07 16:34:27 agc Exp $ */
2 1.1 bouyer
3 1.1 bouyer /*
4 1.1 bouyer * Copyright (c) 1982, 1986, 1989, 1993
5 1.1 bouyer * The Regents of the University of California. All rights reserved.
6 1.1 bouyer *
7 1.1 bouyer * Redistribution and use in source and binary forms, with or without
8 1.1 bouyer * modification, are permitted provided that the following conditions
9 1.1 bouyer * are met:
10 1.1 bouyer * 1. Redistributions of source code must retain the above copyright
11 1.1 bouyer * notice, this list of conditions and the following disclaimer.
12 1.1 bouyer * 2. Redistributions in binary form must reproduce the above copyright
13 1.1 bouyer * notice, this list of conditions and the following disclaimer in the
14 1.1 bouyer * documentation and/or other materials provided with the distribution.
15 1.10 agc * 3. Neither the name of the University nor the names of its contributors
16 1.10 agc * may be used to endorse or promote products derived from this software
17 1.10 agc * without specific prior written permission.
18 1.10 agc *
19 1.10 agc * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 1.10 agc * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 1.10 agc * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 1.10 agc * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 1.10 agc * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 1.10 agc * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 1.10 agc * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 1.10 agc * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 1.10 agc * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 1.10 agc * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 1.10 agc * SUCH DAMAGE.
30 1.10 agc *
31 1.10 agc * @(#)ffs_subr.c 8.2 (Berkeley) 9/21/93
32 1.10 agc * Modified for ext2fs by Manuel Bouyer.
33 1.10 agc */
34 1.10 agc
35 1.10 agc /*
36 1.10 agc * Copyright (c) 1997 Manuel Bouyer.
37 1.10 agc *
38 1.10 agc * Redistribution and use in source and binary forms, with or without
39 1.10 agc * modification, are permitted provided that the following conditions
40 1.10 agc * are met:
41 1.10 agc * 1. Redistributions of source code must retain the above copyright
42 1.10 agc * notice, this list of conditions and the following disclaimer.
43 1.10 agc * 2. Redistributions in binary form must reproduce the above copyright
44 1.10 agc * notice, this list of conditions and the following disclaimer in the
45 1.10 agc * documentation and/or other materials provided with the distribution.
46 1.1 bouyer * 3. All advertising materials mentioning features or use of this software
47 1.1 bouyer * must display the following acknowledgement:
48 1.1 bouyer * This product includes software developed by the University of
49 1.1 bouyer * California, Berkeley and its contributors.
50 1.1 bouyer * 4. Neither the name of the University nor the names of its contributors
51 1.1 bouyer * may be used to endorse or promote products derived from this software
52 1.1 bouyer * without specific prior written permission.
53 1.1 bouyer *
54 1.1 bouyer * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
55 1.1 bouyer * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
56 1.1 bouyer * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
57 1.1 bouyer * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
58 1.1 bouyer * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
59 1.1 bouyer * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
60 1.1 bouyer * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
61 1.1 bouyer * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
62 1.1 bouyer * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
63 1.1 bouyer * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
64 1.1 bouyer * SUCH DAMAGE.
65 1.1 bouyer *
66 1.1 bouyer * @(#)ffs_subr.c 8.2 (Berkeley) 9/21/93
67 1.1 bouyer * Modified for ext2fs by Manuel Bouyer.
68 1.1 bouyer */
69 1.6 lukem
70 1.6 lukem #include <sys/cdefs.h>
71 1.10 agc __KERNEL_RCSID(0, "$NetBSD: ext2fs_subr.c,v 1.10 2003/08/07 16:34:27 agc Exp $");
72 1.1 bouyer
73 1.1 bouyer #include <sys/param.h>
74 1.1 bouyer #include <sys/systm.h>
75 1.1 bouyer #include <sys/vnode.h>
76 1.1 bouyer #include <sys/buf.h>
77 1.9 tron #include <sys/inttypes.h>
78 1.1 bouyer #include <ufs/ufs/inode.h>
79 1.2 fvdl #include <ufs/ext2fs/ext2fs.h>
80 1.2 fvdl #include <ufs/ext2fs/ext2fs_extern.h>
81 1.1 bouyer
82 1.1 bouyer /*
83 1.1 bouyer * Return buffer with the contents of block "offset" from the beginning of
84 1.1 bouyer * directory "ip". If "res" is non-zero, fill it in with a pointer to the
85 1.1 bouyer * remaining space in the directory.
86 1.1 bouyer */
87 1.1 bouyer int
88 1.1 bouyer ext2fs_blkatoff(v)
89 1.1 bouyer void *v;
90 1.1 bouyer {
91 1.1 bouyer struct vop_blkatoff_args /* {
92 1.1 bouyer struct vnode *a_vp;
93 1.1 bouyer off_t a_offset;
94 1.1 bouyer char **a_res;
95 1.1 bouyer struct buf **a_bpp;
96 1.1 bouyer } */ *ap = v;
97 1.1 bouyer struct inode *ip;
98 1.4 augustss struct m_ext2fs *fs;
99 1.1 bouyer struct buf *bp;
100 1.7 fvdl daddr_t lbn;
101 1.1 bouyer int error;
102 1.1 bouyer
103 1.1 bouyer ip = VTOI(ap->a_vp);
104 1.1 bouyer fs = ip->i_e2fs;
105 1.1 bouyer lbn = lblkno(fs, ap->a_offset);
106 1.1 bouyer
107 1.1 bouyer *ap->a_bpp = NULL;
108 1.1 bouyer if ((error = bread(ap->a_vp, lbn, fs->e2fs_bsize, NOCRED, &bp)) != 0) {
109 1.1 bouyer brelse(bp);
110 1.1 bouyer return (error);
111 1.1 bouyer }
112 1.1 bouyer if (ap->a_res)
113 1.1 bouyer *ap->a_res = (char *)bp->b_data + blkoff(fs, ap->a_offset);
114 1.1 bouyer *ap->a_bpp = bp;
115 1.1 bouyer return (0);
116 1.1 bouyer }
117 1.1 bouyer
118 1.3 cgd #ifdef DIAGNOSTIC
119 1.1 bouyer void
120 1.1 bouyer ext2fs_checkoverlap(bp, ip)
121 1.1 bouyer struct buf *bp;
122 1.1 bouyer struct inode *ip;
123 1.1 bouyer {
124 1.4 augustss struct buf *ebp, *ep;
125 1.7 fvdl daddr_t start, last;
126 1.1 bouyer struct vnode *vp;
127 1.1 bouyer
128 1.1 bouyer ebp = &buf[nbuf];
129 1.1 bouyer start = bp->b_blkno;
130 1.1 bouyer last = start + btodb(bp->b_bcount) - 1;
131 1.1 bouyer for (ep = buf; ep < ebp; ep++) {
132 1.1 bouyer if (ep == bp || (ep->b_flags & B_INVAL) ||
133 1.1 bouyer ep->b_vp == NULLVP)
134 1.1 bouyer continue;
135 1.7 fvdl if (VOP_BMAP(ep->b_vp, (daddr_t)0, &vp, (daddr_t)0, NULL))
136 1.1 bouyer continue;
137 1.1 bouyer if (vp != ip->i_devvp)
138 1.1 bouyer continue;
139 1.1 bouyer /* look for overlap */
140 1.1 bouyer if (ep->b_bcount == 0 || ep->b_blkno > last ||
141 1.1 bouyer ep->b_blkno + btodb(ep->b_bcount) <= start)
142 1.1 bouyer continue;
143 1.1 bouyer vprint("Disk overlap", vp);
144 1.9 tron printf("\tstart %" PRId64 ", end %" PRId64 " overlap start "
145 1.9 tron "%" PRId64 ", end %" PRId64 "\n",
146 1.1 bouyer start, last, ep->b_blkno,
147 1.1 bouyer ep->b_blkno + btodb(ep->b_bcount) - 1);
148 1.1 bouyer panic("Disk buffer overlap");
149 1.1 bouyer }
150 1.1 bouyer }
151 1.3 cgd #endif
152