1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
|
/*
* Copyright (c) 2000-2001 Christoph Hellwig.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification.
* 2. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL").
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* Veritas filesystem driver - filesystem to disk block mapping.
*/
#include <linux/fs.h>
#include <linux/buffer_head.h>
#include <linux/kernel.h>
#include "vxfs.h"
#include "vxfs_inode.h"
#include "vxfs_extern.h"
#ifdef DIAGNOSTIC
static void
vxfs_typdump(struct vxfs_typed *typ)
{
printk(KERN_DEBUG "type=%Lu ", typ->vt_hdr >> VXFS_TYPED_TYPESHIFT);
printk("offset=%Lx ", typ->vt_hdr & VXFS_TYPED_OFFSETMASK);
printk("block=%x ", typ->vt_block);
printk("size=%x\n", typ->vt_size);
}
#endif
/**
* vxfs_bmap_ext4 - do bmap for ext4 extents
* @ip: pointer to the inode we do bmap for
* @iblock: logical block.
*
* Description:
* vxfs_bmap_ext4 performs the bmap operation for inodes with
* ext4-style extents (which are much like the traditional UNIX
* inode organisation).
*
* Returns:
* The physical block number on success, else Zero.
*/
static daddr_t
vxfs_bmap_ext4(struct inode *ip, long bn)
{
struct super_block *sb = ip->i_sb;
struct vxfs_inode_info *vip = VXFS_INO(ip);
unsigned long bsize = sb->s_blocksize;
u32 indsize = vip->vii_ext4.ve4_indsize;
int i;
if (indsize > sb->s_blocksize)
goto fail_size;
for (i = 0; i < VXFS_NDADDR; i++) {
struct direct *d = vip->vii_ext4.ve4_direct + i;
if (bn >= 0 && bn < d->size)
return (bn + d->extent);
bn -= d->size;
}
if ((bn / (indsize * indsize * bsize / 4)) == 0) {
struct buffer_head *buf;
daddr_t bno;
u32 *indir;
buf = sb_bread(sb, vip->vii_ext4.ve4_indir[0]);
if (!buf || !buffer_mapped(buf))
goto fail_buf;
indir = (u32 *)buf->b_data;
bno = indir[(bn/indsize) % (indsize*bn)] + (bn%indsize);
brelse(buf);
return bno;
} else
printk(KERN_WARNING "no matching indir?");
return 0;
fail_size:
printk("vxfs: indirect extent too big!\n");
fail_buf:
return 0;
}
/**
* vxfs_bmap_indir - recursion for vxfs_bmap_typed
* @ip: pointer to the inode we do bmap for
* @indir: indirect block we start reading at
* @size: size of the typed area to search
* @block: partially result from further searches
*
* Description:
* vxfs_bmap_indir reads a &struct vxfs_typed at @indir
* and performs the type-defined action.
*
* Return Value:
* The physical block number on success, else Zero.
*
* Note:
* Kernelstack is rare. Unrecurse?
*/
static daddr_t
vxfs_bmap_indir(struct inode *ip, long indir, int size, long block)
{
struct buffer_head *bp = NULL;
daddr_t pblock = 0;
int i;
for (i = 0; i < size * VXFS_TYPED_PER_BLOCK(ip->i_sb); i++) {
struct vxfs_typed *typ;
int64_t off;
bp = sb_bread(ip->i_sb,
indir + (i / VXFS_TYPED_PER_BLOCK(ip->i_sb)));
if (!bp || !buffer_mapped(bp))
return 0;
typ = ((struct vxfs_typed *)bp->b_data) +
(i % VXFS_TYPED_PER_BLOCK(ip->i_sb));
off = (typ->vt_hdr & VXFS_TYPED_OFFSETMASK);
if (block < off) {
brelse(bp);
continue;
}
switch ((u_int32_t)(typ->vt_hdr >> VXFS_TYPED_TYPESHIFT)) {
case VXFS_TYPED_INDIRECT:
pblock = vxfs_bmap_indir(ip, typ->vt_block,
typ->vt_size, block - off);
if (pblock == -2)
break;
goto out;
case VXFS_TYPED_DATA:
if ((block - off) >= typ->vt_size)
break;
pblock = (typ->vt_block + block - off);
goto out;
case VXFS_TYPED_INDIRECT_DEV4:
case VXFS_TYPED_DATA_DEV4: {
struct vxfs_typed_dev4 *typ4 =
(struct vxfs_typed_dev4 *)typ;
printk(KERN_INFO "\n\nTYPED_DEV4 detected!\n");
printk(KERN_INFO "block: %Lu\tsize: %Ld\tdev: %d\n",
(unsigned long long) typ4->vd4_block,
(unsigned long long) typ4->vd4_size,
typ4->vd4_dev);
goto fail;
}
default:
BUG();
}
brelse(bp);
}
fail:
pblock = 0;
out:
brelse(bp);
return (pblock);
}
/**
* vxfs_bmap_typed - bmap for typed extents
* @ip: pointer to the inode we do bmap for
* @iblock: logical block
*
* Description:
* Performs the bmap operation for typed extents.
*
* Return Value:
* The physical block number on success, else Zero.
*/
static daddr_t
vxfs_bmap_typed(struct inode *ip, long iblock)
{
struct vxfs_inode_info *vip = VXFS_INO(ip);
daddr_t pblock = 0;
int i;
for (i = 0; i < VXFS_NTYPED; i++) {
struct vxfs_typed *typ = vip->vii_org.typed + i;
int64_t off = (typ->vt_hdr & VXFS_TYPED_OFFSETMASK);
#ifdef DIAGNOSTIC
vxfs_typdump(typ);
#endif
if (iblock < off)
continue;
switch ((u_int32_t)(typ->vt_hdr >> VXFS_TYPED_TYPESHIFT)) {
case VXFS_TYPED_INDIRECT:
pblock = vxfs_bmap_indir(ip, typ->vt_block,
typ->vt_size, iblock - off);
if (pblock == -2)
break;
return (pblock);
case VXFS_TYPED_DATA:
if ((iblock - off) < typ->vt_size)
return (typ->vt_block + iblock - off);
break;
case VXFS_TYPED_INDIRECT_DEV4:
case VXFS_TYPED_DATA_DEV4: {
struct vxfs_typed_dev4 *typ4 =
(struct vxfs_typed_dev4 *)typ;
printk(KERN_INFO "\n\nTYPED_DEV4 detected!\n");
printk(KERN_INFO "block: %Lu\tsize: %Ld\tdev: %d\n",
(unsigned long long) typ4->vd4_block,
(unsigned long long) typ4->vd4_size,
typ4->vd4_dev);
return 0;
}
default:
BUG();
}
}
return 0;
}
/**
* vxfs_bmap1 - vxfs-internal bmap operation
* @ip: pointer to the inode we do bmap for
* @iblock: logical block
*
* Description:
* vxfs_bmap1 perfoms a logical to physical block mapping
* for vxfs-internal purposes.
*
* Return Value:
* The physical block number on success, else Zero.
*/
daddr_t
vxfs_bmap1(struct inode *ip, long iblock)
{
struct vxfs_inode_info *vip = VXFS_INO(ip);
if (VXFS_ISEXT4(vip))
return vxfs_bmap_ext4(ip, iblock);
if (VXFS_ISTYPED(vip))
return vxfs_bmap_typed(ip, iblock);
if (VXFS_ISNONE(vip))
goto unsupp;
if (VXFS_ISIMMED(vip))
goto unsupp;
printk(KERN_WARNING "vxfs: inode %ld has no valid orgtype (%x)\n",
ip->i_ino, vip->vii_orgtype);
BUG();
unsupp:
printk(KERN_WARNING "vxfs: inode %ld has an unsupported orgtype (%x)\n",
ip->i_ino, vip->vii_orgtype);
return 0;
}
|
