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11#include <linux/fs.h>
12#include <linux/ufs_fs.h>
13#include <linux/time.h>
14#include <linux/stat.h>
15#include <linux/string.h>
16#include <linux/bitops.h>
17
18#include <asm/byteorder.h>
19
20#include "ufs.h"
21#include "swab.h"
22#include "util.h"
23
24
25
26
27
28static void ufs_read_cylinder (struct super_block * sb,
29 unsigned cgno, unsigned bitmap_nr)
30{
31 struct ufs_sb_info * sbi = UFS_SB(sb);
32 struct ufs_sb_private_info * uspi;
33 struct ufs_cg_private_info * ucpi;
34 struct ufs_cylinder_group * ucg;
35 unsigned i, j;
36
37 UFSD("ENTER, cgno %u, bitmap_nr %u\n", cgno, bitmap_nr);
38 uspi = sbi->s_uspi;
39 ucpi = sbi->s_ucpi[bitmap_nr];
40 ucg = (struct ufs_cylinder_group *)sbi->s_ucg[cgno]->b_data;
41
42 UCPI_UBH(ucpi)->fragment = ufs_cgcmin(cgno);
43 UCPI_UBH(ucpi)->count = uspi->s_cgsize >> sb->s_blocksize_bits;
44
45
46
47 UCPI_UBH(ucpi)->bh[0] = sbi->s_ucg[cgno];
48 for (i = 1; i < UCPI_UBH(ucpi)->count; i++)
49 if (!(UCPI_UBH(ucpi)->bh[i] = sb_bread(sb, UCPI_UBH(ucpi)->fragment + i)))
50 goto failed;
51 sbi->s_cgno[bitmap_nr] = cgno;
52
53 ucpi->c_cgx = fs32_to_cpu(sb, ucg->cg_cgx);
54 ucpi->c_ncyl = fs16_to_cpu(sb, ucg->cg_ncyl);
55 ucpi->c_niblk = fs16_to_cpu(sb, ucg->cg_niblk);
56 ucpi->c_ndblk = fs32_to_cpu(sb, ucg->cg_ndblk);
57 ucpi->c_rotor = fs32_to_cpu(sb, ucg->cg_rotor);
58 ucpi->c_frotor = fs32_to_cpu(sb, ucg->cg_frotor);
59 ucpi->c_irotor = fs32_to_cpu(sb, ucg->cg_irotor);
60 ucpi->c_btotoff = fs32_to_cpu(sb, ucg->cg_btotoff);
61 ucpi->c_boff = fs32_to_cpu(sb, ucg->cg_boff);
62 ucpi->c_iusedoff = fs32_to_cpu(sb, ucg->cg_iusedoff);
63 ucpi->c_freeoff = fs32_to_cpu(sb, ucg->cg_freeoff);
64 ucpi->c_nextfreeoff = fs32_to_cpu(sb, ucg->cg_nextfreeoff);
65 ucpi->c_clustersumoff = fs32_to_cpu(sb, ucg->cg_u.cg_44.cg_clustersumoff);
66 ucpi->c_clusteroff = fs32_to_cpu(sb, ucg->cg_u.cg_44.cg_clusteroff);
67 ucpi->c_nclusterblks = fs32_to_cpu(sb, ucg->cg_u.cg_44.cg_nclusterblks);
68 UFSD("EXIT\n");
69 return;
70
71failed:
72 for (j = 1; j < i; j++)
73 brelse (sbi->s_ucg[j]);
74 sbi->s_cgno[bitmap_nr] = UFS_CGNO_EMPTY;
75 ufs_error (sb, "ufs_read_cylinder", "can't read cylinder group block %u", cgno);
76}
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80
81
82void ufs_put_cylinder (struct super_block * sb, unsigned bitmap_nr)
83{
84 struct ufs_sb_info * sbi = UFS_SB(sb);
85 struct ufs_sb_private_info * uspi;
86 struct ufs_cg_private_info * ucpi;
87 struct ufs_cylinder_group * ucg;
88 unsigned i;
89
90 UFSD("ENTER, bitmap_nr %u\n", bitmap_nr);
91
92 uspi = sbi->s_uspi;
93 if (sbi->s_cgno[bitmap_nr] == UFS_CGNO_EMPTY) {
94 UFSD("EXIT\n");
95 return;
96 }
97 ucpi = sbi->s_ucpi[bitmap_nr];
98 ucg = ubh_get_ucg(UCPI_UBH(ucpi));
99
100 if (uspi->s_ncg > UFS_MAX_GROUP_LOADED && bitmap_nr >= sbi->s_cg_loaded) {
101 ufs_panic (sb, "ufs_put_cylinder", "internal error");
102 return;
103 }
104
105
106
107
108 ucg->cg_rotor = cpu_to_fs32(sb, ucpi->c_rotor);
109 ucg->cg_frotor = cpu_to_fs32(sb, ucpi->c_frotor);
110 ucg->cg_irotor = cpu_to_fs32(sb, ucpi->c_irotor);
111 ubh_mark_buffer_dirty (UCPI_UBH(ucpi));
112 for (i = 1; i < UCPI_UBH(ucpi)->count; i++) {
113 brelse (UCPI_UBH(ucpi)->bh[i]);
114 }
115
116 sbi->s_cgno[bitmap_nr] = UFS_CGNO_EMPTY;
117 UFSD("EXIT\n");
118}
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124
125
126struct ufs_cg_private_info * ufs_load_cylinder (
127 struct super_block * sb, unsigned cgno)
128{
129 struct ufs_sb_info * sbi = UFS_SB(sb);
130 struct ufs_sb_private_info * uspi;
131 struct ufs_cg_private_info * ucpi;
132 unsigned cg, i, j;
133
134 UFSD("ENTER, cgno %u\n", cgno);
135
136 uspi = sbi->s_uspi;
137 if (cgno >= uspi->s_ncg) {
138 ufs_panic (sb, "ufs_load_cylinder", "internal error, high number of cg");
139 return NULL;
140 }
141
142
143
144 if (sbi->s_cgno[0] == cgno) {
145 UFSD("EXIT\n");
146 return sbi->s_ucpi[0];
147 }
148
149
150
151 if (uspi->s_ncg <= UFS_MAX_GROUP_LOADED) {
152 if (sbi->s_cgno[cgno] != UFS_CGNO_EMPTY) {
153 if (sbi->s_cgno[cgno] != cgno) {
154 ufs_panic (sb, "ufs_load_cylinder", "internal error, wrong number of cg in cache");
155 UFSD("EXIT (FAILED)\n");
156 return NULL;
157 }
158 else {
159 UFSD("EXIT\n");
160 return sbi->s_ucpi[cgno];
161 }
162 } else {
163 ufs_read_cylinder (sb, cgno, cgno);
164 UFSD("EXIT\n");
165 return sbi->s_ucpi[cgno];
166 }
167 }
168
169
170
171
172 for (i = 0; i < sbi->s_cg_loaded && sbi->s_cgno[i] != cgno; i++);
173 if (i < sbi->s_cg_loaded && sbi->s_cgno[i] == cgno) {
174 cg = sbi->s_cgno[i];
175 ucpi = sbi->s_ucpi[i];
176 for (j = i; j > 0; j--) {
177 sbi->s_cgno[j] = sbi->s_cgno[j-1];
178 sbi->s_ucpi[j] = sbi->s_ucpi[j-1];
179 }
180 sbi->s_cgno[0] = cg;
181 sbi->s_ucpi[0] = ucpi;
182
183
184
185
186 } else {
187 if (sbi->s_cg_loaded < UFS_MAX_GROUP_LOADED)
188 sbi->s_cg_loaded++;
189 else
190 ufs_put_cylinder (sb, UFS_MAX_GROUP_LOADED-1);
191 ucpi = sbi->s_ucpi[sbi->s_cg_loaded - 1];
192 for (j = sbi->s_cg_loaded - 1; j > 0; j--) {
193 sbi->s_cgno[j] = sbi->s_cgno[j-1];
194 sbi->s_ucpi[j] = sbi->s_ucpi[j-1];
195 }
196 sbi->s_ucpi[0] = ucpi;
197 ufs_read_cylinder (sb, cgno, 0);
198 }
199 UFSD("EXIT\n");
200 return sbi->s_ucpi[0];
201}
202