blob: bc4b57da306a4609e4e597702e928f69519e99c3 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Copyright (c) 2000-2001 Christoph Hellwig.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions, and the following disclaimer,
10 * without modification.
11 * 2. The name of the author may not be used to endorse or promote products
12 * derived from this software without specific prior written permission.
13 *
14 * Alternatively, this software may be distributed under the terms of the
15 * GNU General Public License ("GPL").
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
21 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30/*
31 * Veritas filesystem driver - filesystem to disk block mapping.
32 */
33#include <linux/fs.h>
34#include <linux/buffer_head.h>
35#include <linux/kernel.h>
36
37#include "vxfs.h"
38#include "vxfs_inode.h"
39
40
41#ifdef DIAGNOSTIC
42static void
43vxfs_typdump(struct vxfs_typed *typ)
44{
45 printk(KERN_DEBUG "type=%Lu ", typ->vt_hdr >> VXFS_TYPED_TYPESHIFT);
46 printk("offset=%Lx ", typ->vt_hdr & VXFS_TYPED_OFFSETMASK);
47 printk("block=%x ", typ->vt_block);
48 printk("size=%x\n", typ->vt_size);
49}
50#endif
51
52/**
53 * vxfs_bmap_ext4 - do bmap for ext4 extents
54 * @ip: pointer to the inode we do bmap for
55 * @iblock: logical block.
56 *
57 * Description:
58 * vxfs_bmap_ext4 performs the bmap operation for inodes with
59 * ext4-style extents (which are much like the traditional UNIX
60 * inode organisation).
61 *
62 * Returns:
63 * The physical block number on success, else Zero.
64 */
65static daddr_t
66vxfs_bmap_ext4(struct inode *ip, long bn)
67{
68 struct super_block *sb = ip->i_sb;
69 struct vxfs_inode_info *vip = VXFS_INO(ip);
70 unsigned long bsize = sb->s_blocksize;
71 u32 indsize = vip->vii_ext4.ve4_indsize;
72 int i;
73
74 if (indsize > sb->s_blocksize)
75 goto fail_size;
76
77 for (i = 0; i < VXFS_NDADDR; i++) {
78 struct direct *d = vip->vii_ext4.ve4_direct + i;
79 if (bn >= 0 && bn < d->size)
80 return (bn + d->extent);
81 bn -= d->size;
82 }
83
84 if ((bn / (indsize * indsize * bsize / 4)) == 0) {
85 struct buffer_head *buf;
86 daddr_t bno;
87 u32 *indir;
88
89 buf = sb_bread(sb, vip->vii_ext4.ve4_indir[0]);
90 if (!buf || !buffer_mapped(buf))
91 goto fail_buf;
92
93 indir = (u32 *)buf->b_data;
94 bno = indir[(bn/indsize) % (indsize*bn)] + (bn%indsize);
95
96 brelse(buf);
97 return bno;
98 } else
99 printk(KERN_WARNING "no matching indir?");
100
101 return 0;
102
103fail_size:
104 printk("vxfs: indirect extent to big!\n");
105fail_buf:
106 return 0;
107}
108
109/**
110 * vxfs_bmap_indir - recursion for vxfs_bmap_typed
111 * @ip: pointer to the inode we do bmap for
112 * @indir: indirect block we start reading at
113 * @size: size of the typed area to search
114 * @block: partially result from further searches
115 *
116 * Description:
117 * vxfs_bmap_indir reads a &struct vxfs_typed at @indir
118 * and performs the type-defined action.
119 *
120 * Return Value:
121 * The physical block number on success, else Zero.
122 *
123 * Note:
124 * Kernelstack is rare. Unrecurse?
125 */
126static daddr_t
127vxfs_bmap_indir(struct inode *ip, long indir, int size, long block)
128{
129 struct buffer_head *bp = NULL;
130 daddr_t pblock = 0;
131 int i;
132
133 for (i = 0; i < size * VXFS_TYPED_PER_BLOCK(ip->i_sb); i++) {
134 struct vxfs_typed *typ;
135 int64_t off;
136
137 bp = sb_bread(ip->i_sb,
138 indir + (i / VXFS_TYPED_PER_BLOCK(ip->i_sb)));
139 if (!buffer_mapped(bp))
140 return 0;
141
142 typ = ((struct vxfs_typed *)bp->b_data) +
143 (i % VXFS_TYPED_PER_BLOCK(ip->i_sb));
144 off = (typ->vt_hdr & VXFS_TYPED_OFFSETMASK);
145
146 if (block < off) {
147 brelse(bp);
148 continue;
149 }
150
151 switch ((u_int32_t)(typ->vt_hdr >> VXFS_TYPED_TYPESHIFT)) {
152 case VXFS_TYPED_INDIRECT:
153 pblock = vxfs_bmap_indir(ip, typ->vt_block,
154 typ->vt_size, block - off);
155 if (pblock == -2)
156 break;
157 goto out;
158 case VXFS_TYPED_DATA:
159 if ((block - off) >= typ->vt_size)
160 break;
161 pblock = (typ->vt_block + block - off);
162 goto out;
163 case VXFS_TYPED_INDIRECT_DEV4:
164 case VXFS_TYPED_DATA_DEV4: {
165 struct vxfs_typed_dev4 *typ4 =
166 (struct vxfs_typed_dev4 *)typ;
167
168 printk(KERN_INFO "\n\nTYPED_DEV4 detected!\n");
169 printk(KERN_INFO "block: %Lu\tsize: %Ld\tdev: %d\n",
170 (unsigned long long) typ4->vd4_block,
171 (unsigned long long) typ4->vd4_size,
172 typ4->vd4_dev);
173 goto fail;
174 }
175 default:
176 BUG();
177 }
178 brelse(bp);
179 }
180
181fail:
182 pblock = 0;
183out:
184 brelse(bp);
185 return (pblock);
186}
187
188/**
189 * vxfs_bmap_typed - bmap for typed extents
190 * @ip: pointer to the inode we do bmap for
191 * @iblock: logical block
192 *
193 * Description:
194 * Performs the bmap operation for typed extents.
195 *
196 * Return Value:
197 * The physical block number on success, else Zero.
198 */
199static daddr_t
200vxfs_bmap_typed(struct inode *ip, long iblock)
201{
202 struct vxfs_inode_info *vip = VXFS_INO(ip);
203 daddr_t pblock = 0;
204 int i;
205
206 for (i = 0; i < VXFS_NTYPED; i++) {
207 struct vxfs_typed *typ = vip->vii_org.typed + i;
208 int64_t off = (typ->vt_hdr & VXFS_TYPED_OFFSETMASK);
209
210#ifdef DIAGNOSTIC
211 vxfs_typdump(typ);
212#endif
213 if (iblock < off)
214 continue;
215 switch ((u_int32_t)(typ->vt_hdr >> VXFS_TYPED_TYPESHIFT)) {
216 case VXFS_TYPED_INDIRECT:
217 pblock = vxfs_bmap_indir(ip, typ->vt_block,
218 typ->vt_size, iblock - off);
219 if (pblock == -2)
220 break;
221 return (pblock);
222 case VXFS_TYPED_DATA:
223 if ((iblock - off) < typ->vt_size)
224 return (typ->vt_block + iblock - off);
225 break;
226 case VXFS_TYPED_INDIRECT_DEV4:
227 case VXFS_TYPED_DATA_DEV4: {
228 struct vxfs_typed_dev4 *typ4 =
229 (struct vxfs_typed_dev4 *)typ;
230
231 printk(KERN_INFO "\n\nTYPED_DEV4 detected!\n");
232 printk(KERN_INFO "block: %Lu\tsize: %Ld\tdev: %d\n",
233 (unsigned long long) typ4->vd4_block,
234 (unsigned long long) typ4->vd4_size,
235 typ4->vd4_dev);
236 return 0;
237 }
238 default:
239 BUG();
240 }
241 }
242
243 return 0;
244}
245
246/**
247 * vxfs_bmap1 - vxfs-internal bmap operation
248 * @ip: pointer to the inode we do bmap for
249 * @iblock: logical block
250 *
251 * Description:
252 * vxfs_bmap1 perfoms a logical to physical block mapping
253 * for vxfs-internal purposes.
254 *
255 * Return Value:
256 * The physical block number on success, else Zero.
257 */
258daddr_t
259vxfs_bmap1(struct inode *ip, long iblock)
260{
261 struct vxfs_inode_info *vip = VXFS_INO(ip);
262
263 if (VXFS_ISEXT4(vip))
264 return vxfs_bmap_ext4(ip, iblock);
265 if (VXFS_ISTYPED(vip))
266 return vxfs_bmap_typed(ip, iblock);
267 if (VXFS_ISNONE(vip))
268 goto unsupp;
269 if (VXFS_ISIMMED(vip))
270 goto unsupp;
271
272 printk(KERN_WARNING "vxfs: inode %ld has no valid orgtype (%x)\n",
273 ip->i_ino, vip->vii_orgtype);
274 BUG();
275
276unsupp:
277 printk(KERN_WARNING "vxfs: inode %ld has an unsupported orgtype (%x)\n",
278 ip->i_ino, vip->vii_orgtype);
279 return 0;
280}