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