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[minix3.git] / sys / ufs / ext2fs / ext2fs_bmap.c
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1 /* $NetBSD: ext2fs_bmap.c,v 1.26 2013/01/22 09:39:15 dholland Exp $ */
3 /*
4 * Copyright (c) 1989, 1991, 1993
5 * The Regents of the University of California. All rights reserved.
6 * (c) UNIX System Laboratories, Inc.
7 * All or some portions of this file are derived from material licensed
8 * to the University of California by American Telephone and Telegraph
9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
10 * the permission of UNIX System Laboratories, Inc.
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
36 * @(#)ufs_bmap.c 8.6 (Berkeley) 1/21/94
37 * Modified for ext2fs by Manuel Bouyer.
41 * Copyright (c) 1997 Manuel Bouyer.
43 * Redistribution and use in source and binary forms, with or without
44 * modification, are permitted provided that the following conditions
45 * are met:
46 * 1. Redistributions of source code must retain the above copyright
47 * notice, this list of conditions and the following disclaimer.
48 * 2. Redistributions in binary form must reproduce the above copyright
49 * notice, this list of conditions and the following disclaimer in the
50 * documentation and/or other materials provided with the distribution.
52 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
53 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
54 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
55 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
56 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
57 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
58 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
59 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
60 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
61 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
63 * @(#)ufs_bmap.c 8.6 (Berkeley) 1/21/94
64 * Modified for ext2fs by Manuel Bouyer.
67 #include <sys/cdefs.h>
68 __KERNEL_RCSID(0, "$NetBSD: ext2fs_bmap.c,v 1.26 2013/01/22 09:39:15 dholland Exp $");
70 #include <sys/param.h>
71 #include <sys/systm.h>
72 #include <sys/buf.h>
73 #include <sys/proc.h>
74 #include <sys/vnode.h>
75 #include <sys/mount.h>
76 #include <sys/resourcevar.h>
77 #include <sys/trace.h>
79 #include <miscfs/specfs/specdev.h>
81 #include <ufs/ufs/inode.h>
82 #include <ufs/ufs/ufsmount.h>
83 #include <ufs/ufs/ufs_extern.h>
84 #include <ufs/ext2fs/ext2fs.h>
85 #include <ufs/ext2fs/ext2fs_extern.h>
87 static int ext2fs_bmaparray(struct vnode *, daddr_t, daddr_t *,
88 struct indir *, int *, int *);
90 #define is_sequential(ump, a, b) ((b) == (a) + ump->um_seqinc)
93 * Bmap converts a the logical block number of a file to its physical block
94 * number on the disk. The conversion is done by using the logical block
95 * number to index into the array of block pointers described by the dinode.
97 int
98 ext2fs_bmap(void *v)
100 struct vop_bmap_args /* {
101 struct vnode *a_vp;
102 daddr_t a_bn;
103 struct vnode **a_vpp;
104 daddr_t *a_bnp;
105 int *a_runp;
106 } */ *ap = v;
108 * Check for underlying vnode requests and ensure that logical
109 * to physical mapping is requested.
111 if (ap->a_vpp != NULL)
112 *ap->a_vpp = VTOI(ap->a_vp)->i_devvp;
113 if (ap->a_bnp == NULL)
114 return (0);
116 return (ext2fs_bmaparray(ap->a_vp, ap->a_bn, ap->a_bnp, NULL, NULL,
117 ap->a_runp));
121 * Indirect blocks are now on the vnode for the file. They are given negative
122 * logical block numbers. Indirect blocks are addressed by the negative
123 * address of the first data block to which they point. Double indirect blocks
124 * are addressed by one less than the address of the first indirect block to
125 * which they point. Triple indirect blocks are addressed by one less than
126 * the address of the first double indirect block to which they point.
128 * ext2fs_bmaparray does the bmap conversion, and if requested returns the
129 * array of logical blocks which must be traversed to get to a block.
130 * Each entry contains the offset into that block that gets you to the
131 * next block and the disk address of the block (if it is assigned).
135 ext2fs_bmaparray(struct vnode *vp, daddr_t bn, daddr_t *bnp, struct indir *ap,
136 int *nump, int *runp)
138 struct inode *ip;
139 struct buf *bp, *cbp;
140 struct ufsmount *ump;
141 struct mount *mp;
142 struct indir a[EXT2FS_NIADDR+1], *xap;
143 daddr_t daddr;
144 daddr_t metalbn;
145 int error, maxrun = 0, num;
147 ip = VTOI(vp);
148 mp = vp->v_mount;
149 ump = ip->i_ump;
150 #ifdef DIAGNOSTIC
151 if ((ap != NULL && nump == NULL) || (ap == NULL && nump != NULL))
152 panic("ext2fs_bmaparray: invalid arguments");
153 #endif
155 if (runp) {
157 * XXX
158 * If MAXBSIZE is the largest transfer the disks can handle,
159 * we probably want maxrun to be 1 block less so that we
160 * don't create a block larger than the device can handle.
162 *runp = 0;
163 maxrun = MAXBSIZE / mp->mnt_stat.f_iosize - 1;
166 if (bn >= 0 && bn < EXT2FS_NDADDR) {
167 /* XXX ondisk32 */
168 *bnp = blkptrtodb(ump, fs2h32(ip->i_e2fs_blocks[bn]));
169 if (*bnp == 0)
170 *bnp = -1;
171 else if (runp)
172 /* XXX ondisk32 */
173 for (++bn; bn < EXT2FS_NDADDR && *runp < maxrun &&
174 is_sequential(ump, (daddr_t)fs2h32(ip->i_e2fs_blocks[bn - 1]),
175 (daddr_t)fs2h32(ip->i_e2fs_blocks[bn]));
176 ++bn, ++*runp);
177 return (0);
180 xap = ap == NULL ? a : ap;
181 if (!nump)
182 nump = &num;
183 if ((error = ufs_getlbns(vp, bn, xap, nump)) != 0)
184 return (error);
186 num = *nump;
188 /* Get disk address out of indirect block array */
189 /* XXX ondisk32 */
190 daddr = fs2h32(ip->i_e2fs_blocks[EXT2FS_NDADDR + xap->in_off]);
192 #ifdef DIAGNOSTIC
193 if (num > EXT2FS_NIADDR + 1 || num < 1) {
194 printf("ext2fs_bmaparray: num=%d\n", num);
195 panic("ext2fs_bmaparray: num");
197 #endif
198 for (bp = NULL, ++xap; --num; ++xap) {
200 * Exit the loop if there is no disk address assigned yet and
201 * the indirect block isn't in the cache, or if we were
202 * looking for an indirect block and we've found it.
205 metalbn = xap->in_lbn;
206 if (metalbn == bn)
207 break;
208 if (daddr == 0) {
209 mutex_enter(&bufcache_lock);
210 cbp = incore(vp, metalbn);
211 mutex_exit(&bufcache_lock);
212 if (cbp == NULL)
213 break;
216 * If we get here, we've either got the block in the cache
217 * or we have a disk address for it, go fetch it.
219 if (bp)
220 brelse(bp, 0);
222 xap->in_exists = 1;
223 bp = getblk(vp, metalbn, mp->mnt_stat.f_iosize, 0, 0);
224 if (bp == NULL) {
227 * getblk() above returns NULL only iff we are
228 * pagedaemon. See the implementation of getblk
229 * for detail.
232 return (ENOMEM);
234 if (bp->b_oflags & (BO_DONE | BO_DELWRI)) {
235 trace(TR_BREADHIT, pack(vp, size), metalbn);
237 #ifdef DIAGNOSTIC
238 else if (!daddr)
239 panic("ext2fs_bmaparry: indirect block not in cache");
240 #endif
241 else {
242 trace(TR_BREADMISS, pack(vp, size), metalbn);
243 bp->b_blkno = blkptrtodb(ump, daddr);
244 bp->b_flags |= B_READ;
245 VOP_STRATEGY(vp, bp);
246 curlwp->l_ru.ru_inblock++; /* XXX */
247 if ((error = biowait(bp)) != 0) {
248 brelse(bp, 0);
249 return (error);
253 /* XXX ondisk32 */
254 daddr = fs2h32(((int32_t *)bp->b_data)[xap->in_off]);
255 if (num == 1 && daddr && runp)
256 /* XXX ondisk32 */
257 for (bn = xap->in_off + 1;
258 bn < MNINDIR(ump) && *runp < maxrun &&
259 is_sequential(ump, ((int32_t *)bp->b_data)[bn - 1],
260 ((int32_t *)bp->b_data)[bn]);
261 ++bn, ++*runp);
263 if (bp)
264 brelse(bp, 0);
266 daddr = blkptrtodb(ump, daddr);
267 *bnp = daddr == 0 ? -1 : daddr;
268 return (0);