Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
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" | |
6e1e8e11 | 39 | #include "vxfs_extern.h" |
1da177e4 LT |
40 | |
41 | ||
42 | #ifdef DIAGNOSTIC | |
43 | static void | |
44 | vxfs_typdump(struct vxfs_typed *typ) | |
45 | { | |
46 | printk(KERN_DEBUG "type=%Lu ", typ->vt_hdr >> VXFS_TYPED_TYPESHIFT); | |
47 | printk("offset=%Lx ", typ->vt_hdr & VXFS_TYPED_OFFSETMASK); | |
48 | printk("block=%x ", typ->vt_block); | |
49 | printk("size=%x\n", typ->vt_size); | |
50 | } | |
51 | #endif | |
52 | ||
53 | /** | |
54 | * vxfs_bmap_ext4 - do bmap for ext4 extents | |
55 | * @ip: pointer to the inode we do bmap for | |
56 | * @iblock: logical block. | |
57 | * | |
58 | * Description: | |
59 | * vxfs_bmap_ext4 performs the bmap operation for inodes with | |
60 | * ext4-style extents (which are much like the traditional UNIX | |
61 | * inode organisation). | |
62 | * | |
63 | * Returns: | |
64 | * The physical block number on success, else Zero. | |
65 | */ | |
66 | static daddr_t | |
67 | vxfs_bmap_ext4(struct inode *ip, long bn) | |
68 | { | |
69 | struct super_block *sb = ip->i_sb; | |
70 | struct vxfs_inode_info *vip = VXFS_INO(ip); | |
0d83f7fc | 71 | struct vxfs_sb_info *sbi = VXFS_SBI(sb); |
1da177e4 | 72 | unsigned long bsize = sb->s_blocksize; |
0d83f7fc | 73 | u32 indsize = fs32_to_cpu(sbi, vip->vii_ext4.ve4_indsize); |
1da177e4 LT |
74 | int i; |
75 | ||
76 | if (indsize > sb->s_blocksize) | |
77 | goto fail_size; | |
78 | ||
79 | for (i = 0; i < VXFS_NDADDR; i++) { | |
80 | struct direct *d = vip->vii_ext4.ve4_direct + i; | |
0d83f7fc KB |
81 | if (bn >= 0 && bn < fs32_to_cpu(sbi, d->size)) |
82 | return (bn + fs32_to_cpu(sbi, d->extent)); | |
83 | bn -= fs32_to_cpu(sbi, d->size); | |
1da177e4 LT |
84 | } |
85 | ||
86 | if ((bn / (indsize * indsize * bsize / 4)) == 0) { | |
87 | struct buffer_head *buf; | |
88 | daddr_t bno; | |
0d83f7fc | 89 | __fs32 *indir; |
1da177e4 | 90 | |
0d83f7fc KB |
91 | buf = sb_bread(sb, |
92 | fs32_to_cpu(sbi, vip->vii_ext4.ve4_indir[0])); | |
1da177e4 LT |
93 | if (!buf || !buffer_mapped(buf)) |
94 | goto fail_buf; | |
95 | ||
0d83f7fc KB |
96 | indir = (__fs32 *)buf->b_data; |
97 | bno = fs32_to_cpu(sbi, indir[(bn / indsize) % (indsize * bn)]) + | |
98 | (bn % indsize); | |
1da177e4 LT |
99 | |
100 | brelse(buf); | |
101 | return bno; | |
102 | } else | |
103 | printk(KERN_WARNING "no matching indir?"); | |
104 | ||
105 | return 0; | |
106 | ||
107 | fail_size: | |
8cb681b9 | 108 | printk("vxfs: indirect extent too big!\n"); |
1da177e4 LT |
109 | fail_buf: |
110 | return 0; | |
111 | } | |
112 | ||
113 | /** | |
114 | * vxfs_bmap_indir - recursion for vxfs_bmap_typed | |
115 | * @ip: pointer to the inode we do bmap for | |
116 | * @indir: indirect block we start reading at | |
117 | * @size: size of the typed area to search | |
118 | * @block: partially result from further searches | |
119 | * | |
120 | * Description: | |
121 | * vxfs_bmap_indir reads a &struct vxfs_typed at @indir | |
122 | * and performs the type-defined action. | |
123 | * | |
124 | * Return Value: | |
125 | * The physical block number on success, else Zero. | |
126 | * | |
127 | * Note: | |
128 | * Kernelstack is rare. Unrecurse? | |
129 | */ | |
130 | static daddr_t | |
131 | vxfs_bmap_indir(struct inode *ip, long indir, int size, long block) | |
132 | { | |
0d83f7fc | 133 | struct vxfs_sb_info *sbi = VXFS_SBI(ip->i_sb); |
1da177e4 LT |
134 | struct buffer_head *bp = NULL; |
135 | daddr_t pblock = 0; | |
136 | int i; | |
137 | ||
138 | for (i = 0; i < size * VXFS_TYPED_PER_BLOCK(ip->i_sb); i++) { | |
139 | struct vxfs_typed *typ; | |
140 | int64_t off; | |
141 | ||
142 | bp = sb_bread(ip->i_sb, | |
143 | indir + (i / VXFS_TYPED_PER_BLOCK(ip->i_sb))); | |
82f703bb | 144 | if (!bp || !buffer_mapped(bp)) |
1da177e4 LT |
145 | return 0; |
146 | ||
147 | typ = ((struct vxfs_typed *)bp->b_data) + | |
148 | (i % VXFS_TYPED_PER_BLOCK(ip->i_sb)); | |
0d83f7fc | 149 | off = fs64_to_cpu(sbi, typ->vt_hdr) & VXFS_TYPED_OFFSETMASK; |
1da177e4 LT |
150 | |
151 | if (block < off) { | |
152 | brelse(bp); | |
153 | continue; | |
154 | } | |
155 | ||
0d83f7fc KB |
156 | switch ((u_int32_t)(fs64_to_cpu(sbi, typ->vt_hdr) >> |
157 | VXFS_TYPED_TYPESHIFT)) { | |
1da177e4 | 158 | case VXFS_TYPED_INDIRECT: |
0d83f7fc KB |
159 | pblock = vxfs_bmap_indir(ip, |
160 | fs32_to_cpu(sbi, typ->vt_block), | |
161 | fs32_to_cpu(sbi, typ->vt_size), | |
162 | block - off); | |
1da177e4 LT |
163 | if (pblock == -2) |
164 | break; | |
165 | goto out; | |
166 | case VXFS_TYPED_DATA: | |
0d83f7fc | 167 | if ((block - off) >= fs32_to_cpu(sbi, typ->vt_size)) |
1da177e4 | 168 | break; |
0d83f7fc | 169 | pblock = fs32_to_cpu(sbi, typ->vt_block) + block - off; |
1da177e4 LT |
170 | goto out; |
171 | case VXFS_TYPED_INDIRECT_DEV4: | |
172 | case VXFS_TYPED_DATA_DEV4: { | |
173 | struct vxfs_typed_dev4 *typ4 = | |
174 | (struct vxfs_typed_dev4 *)typ; | |
175 | ||
176 | printk(KERN_INFO "\n\nTYPED_DEV4 detected!\n"); | |
0d83f7fc KB |
177 | printk(KERN_INFO "block: %llu\tsize: %lld\tdev: %d\n", |
178 | fs64_to_cpu(sbi, typ4->vd4_block), | |
179 | fs64_to_cpu(sbi, typ4->vd4_size), | |
180 | fs32_to_cpu(sbi, typ4->vd4_dev)); | |
1da177e4 LT |
181 | goto fail; |
182 | } | |
183 | default: | |
0d83f7fc KB |
184 | printk(KERN_ERR "%s:%d vt_hdr %llu\n", __func__, |
185 | __LINE__, fs64_to_cpu(sbi, typ->vt_hdr)); | |
1da177e4 LT |
186 | BUG(); |
187 | } | |
188 | brelse(bp); | |
189 | } | |
190 | ||
191 | fail: | |
192 | pblock = 0; | |
193 | out: | |
194 | brelse(bp); | |
195 | return (pblock); | |
196 | } | |
197 | ||
198 | /** | |
199 | * vxfs_bmap_typed - bmap for typed extents | |
200 | * @ip: pointer to the inode we do bmap for | |
201 | * @iblock: logical block | |
202 | * | |
203 | * Description: | |
204 | * Performs the bmap operation for typed extents. | |
205 | * | |
206 | * Return Value: | |
207 | * The physical block number on success, else Zero. | |
208 | */ | |
209 | static daddr_t | |
210 | vxfs_bmap_typed(struct inode *ip, long iblock) | |
211 | { | |
212 | struct vxfs_inode_info *vip = VXFS_INO(ip); | |
0d83f7fc | 213 | struct vxfs_sb_info *sbi = VXFS_SBI(ip->i_sb); |
1da177e4 LT |
214 | daddr_t pblock = 0; |
215 | int i; | |
216 | ||
217 | for (i = 0; i < VXFS_NTYPED; i++) { | |
218 | struct vxfs_typed *typ = vip->vii_org.typed + i; | |
0d83f7fc KB |
219 | u64 hdr = fs64_to_cpu(sbi, typ->vt_hdr); |
220 | int64_t off = (hdr & VXFS_TYPED_OFFSETMASK); | |
1da177e4 LT |
221 | |
222 | #ifdef DIAGNOSTIC | |
223 | vxfs_typdump(typ); | |
224 | #endif | |
225 | if (iblock < off) | |
226 | continue; | |
0d83f7fc | 227 | switch ((u32)(hdr >> VXFS_TYPED_TYPESHIFT)) { |
1da177e4 | 228 | case VXFS_TYPED_INDIRECT: |
0d83f7fc KB |
229 | pblock = vxfs_bmap_indir(ip, |
230 | fs32_to_cpu(sbi, typ->vt_block), | |
231 | fs32_to_cpu(sbi, typ->vt_size), | |
232 | iblock - off); | |
1da177e4 LT |
233 | if (pblock == -2) |
234 | break; | |
235 | return (pblock); | |
236 | case VXFS_TYPED_DATA: | |
0d83f7fc KB |
237 | if ((iblock - off) < fs32_to_cpu(sbi, typ->vt_size)) |
238 | return (fs32_to_cpu(sbi, typ->vt_block) + | |
239 | iblock - off); | |
1da177e4 LT |
240 | break; |
241 | case VXFS_TYPED_INDIRECT_DEV4: | |
242 | case VXFS_TYPED_DATA_DEV4: { | |
243 | struct vxfs_typed_dev4 *typ4 = | |
244 | (struct vxfs_typed_dev4 *)typ; | |
245 | ||
246 | printk(KERN_INFO "\n\nTYPED_DEV4 detected!\n"); | |
0d83f7fc KB |
247 | printk(KERN_INFO "block: %llu\tsize: %lld\tdev: %d\n", |
248 | fs64_to_cpu(sbi, typ4->vd4_block), | |
249 | fs64_to_cpu(sbi, typ4->vd4_size), | |
250 | fs32_to_cpu(sbi, typ4->vd4_dev)); | |
1da177e4 LT |
251 | return 0; |
252 | } | |
253 | default: | |
254 | BUG(); | |
255 | } | |
256 | } | |
257 | ||
258 | return 0; | |
259 | } | |
260 | ||
261 | /** | |
262 | * vxfs_bmap1 - vxfs-internal bmap operation | |
263 | * @ip: pointer to the inode we do bmap for | |
264 | * @iblock: logical block | |
265 | * | |
266 | * Description: | |
267 | * vxfs_bmap1 perfoms a logical to physical block mapping | |
268 | * for vxfs-internal purposes. | |
269 | * | |
270 | * Return Value: | |
271 | * The physical block number on success, else Zero. | |
272 | */ | |
273 | daddr_t | |
274 | vxfs_bmap1(struct inode *ip, long iblock) | |
275 | { | |
276 | struct vxfs_inode_info *vip = VXFS_INO(ip); | |
277 | ||
278 | if (VXFS_ISEXT4(vip)) | |
279 | return vxfs_bmap_ext4(ip, iblock); | |
280 | if (VXFS_ISTYPED(vip)) | |
281 | return vxfs_bmap_typed(ip, iblock); | |
282 | if (VXFS_ISNONE(vip)) | |
283 | goto unsupp; | |
284 | if (VXFS_ISIMMED(vip)) | |
285 | goto unsupp; | |
286 | ||
287 | printk(KERN_WARNING "vxfs: inode %ld has no valid orgtype (%x)\n", | |
288 | ip->i_ino, vip->vii_orgtype); | |
289 | BUG(); | |
290 | ||
291 | unsupp: | |
292 | printk(KERN_WARNING "vxfs: inode %ld has an unsupported orgtype (%x)\n", | |
293 | ip->i_ino, vip->vii_orgtype); | |
294 | return 0; | |
295 | } |