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
|
/* Fetching and storing the hypermetadata (superblock and cg summary info).
Copyright (C) 1994 Free Software Foundation
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2, or (at
your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "ufs.h"
#include "fs.h"
#include "dinode.h"
#include <string.h>
#include <stdio.h>
static int oldformat = 0;
void
get_hypermetadata (void)
{
error_t err;
sblock = (struct fs *) disk_image + SBOFF;
if (sblock->fs_magic != FS_MAGIC)
{
fprintf (stderr, "Bad magic number %#lx (should be %#x)\n",
sblock->fs_magic, FS_MAGIC);
exit (1);
}
if (sblock->fs_bsize > 8192)
{
fprintf (stderr, "Block size %ld is too big (max is 8192 bytes)\n",
sblock->fs_bsize);
exit (1);
}
if (sblock->fs_bsize < sizeof (struct fs))
{
fprintf (stderr, "Block size %ld is too small (min is %ld bytes)\n",
sblock->fs_bsize, sizeof (struct fs));
exit (1);
}
if (sblock->fs_maxsymlinklen > (long)MAXSYMLINKLEN)
{
fprintf (stderr, "Max shortcut symlinklen %ld is too big (max is %ld)\n",
sblock->fs_maxsymlinklen, MAXSYMLINKLEN);
exit (1);
}
/* If this is an old filesystem, then we have some more
work to do; some crucial constants might not be set; we
are therefore forced to set them here. */
if (sblock->fs_npsect < sblock->fs_nsect)
sblock->fs_npsect = sblock->fs_nsect;
if (sblock->fs_interleave < 1)
sblock->fs_interleave = 1;
if (sblock->fs_postblformat == FS_42POSTBLFMT
|| sblock->fs_inodefmt < FS_44INODEFMT)
{
/* Make a local copy so we don't write our different
values into the old format disk. */
sblock = malloc (SBSIZE);
bcopy (disk_image + SBOFF, sblock, SBSIZE);
if (sblock->fs_postblformat == FS_42POSTBLFMT)
sblock->fs_nrpos = 8;
if (sblock->fs_inodefmt < FS_44INODEFMT)
{
quad_t sizepb = sblock->fs_bsize;
int i;
oldformat = 1;
sblock->fs_maxfilesize = sblock->fs_bsize * NDADDR - 1;
for (i = 0; i < NIADDR; i++)
{
sizepb *= NINDIR (sblock);
sblock->fs_maxfilesize += sizepb;
}
sblock->fs_qbmask = ~sblock->fs_bmask;
sblock->fs_qfmask = ~sblock->fs_fmask;
}
}
/* Find out if we support the 4.4 symlink/dirtype extension */
if (sblock->fs_maxsymlinklen > 0)
direct_symlink_extension = 1;
else
direct_symlink_extension = 0;
csum = (struct csum *)
(disk_image
+ howmany (sblock->fs_cssize, sblock->fs_fsize) * sblock->fs_fsize);
}
/* Write the superblock and cg summary info to disk. If WAIT is set,
we must wait for everything to hit the disk; if CLEAN is set, then
mark the clean bit. */
void
diskfs_set_hypermetadata (int wait, int clean)
{
error_t (*writefn) (daddr_t, vm_address_t, long);
writefn = (wait ? dev_write_sync : dev_write);
spin_lock (&alloclock);
if (clean && !diskfs_readonly)
{
sblock->fs_clean = 1;
sblock_dirty = 1;
}
if (sblock_dirty)
{
if (sblock->fs_postblformat == FS_42POSTBLFMT
|| oldformat)
{
char sblockcopy[SBSIZE];
struct fs *sbcopy = (struct fs *)sblockcopy;
bcopy (sblock, sblockcopy, SBSIZE);
if (sblock->fs_postblformat == FS_42POSTBLFMT)
sbcopy->fs_nrpos = -1;
if (oldformat)
{
sbcopy->fs_maxfilesize = -1;
sbcopy->fs_qbmask = -1;
sbcopy->fs_qfmask = -1;
}
bcopy (sbcopy, disk_image + SBOFF, SBSIZE)
(*writefn) (SBLOCK, (vm_address_t) sblockcopy, SBSIZE);
}
else
(*writefn) (SBLOCK, (vm_address_t) sblock, SBSIZE);
sblock_dirty = 0;
}
if (clean && !diskfs_readonly)
{
sblock->fs_clean = 0;
sblock_dirty = 1;
}
spin_unlock (&alloclock);
}
|
