1 // SPDX-License-Identifier: GPL-2.0 1 // SPDX-License-Identifier: GPL-2.0
2 /* 2 /*
3 * linux/fs/ufs/cylinder.c 3 * linux/fs/ufs/cylinder.c
4 * 4 *
5 * Copyright (C) 1998 5 * Copyright (C) 1998
6 * Daniel Pirkl <daniel.pirkl@email.cz> 6 * Daniel Pirkl <daniel.pirkl@email.cz>
7 * Charles University, Faculty of Mathematics 7 * Charles University, Faculty of Mathematics and Physics
8 * 8 *
9 * ext2 - inode (block) bitmap caching inspir 9 * ext2 - inode (block) bitmap caching inspired
10 */ 10 */
11 11
12 #include <linux/fs.h> 12 #include <linux/fs.h>
13 #include <linux/time.h> 13 #include <linux/time.h>
14 #include <linux/stat.h> 14 #include <linux/stat.h>
15 #include <linux/string.h> 15 #include <linux/string.h>
16 #include <linux/bitops.h> 16 #include <linux/bitops.h>
17 17
18 #include <asm/byteorder.h> 18 #include <asm/byteorder.h>
19 19
20 #include "ufs_fs.h" 20 #include "ufs_fs.h"
21 #include "ufs.h" 21 #include "ufs.h"
22 #include "swab.h" 22 #include "swab.h"
23 #include "util.h" 23 #include "util.h"
24 24
25 /* 25 /*
26 * Read cylinder group into cache. The memory 26 * Read cylinder group into cache. The memory space for ufs_cg_private_info
27 * structure is already allocated during ufs_r 27 * structure is already allocated during ufs_read_super.
28 */ 28 */
29 static void ufs_read_cylinder (struct super_bl 29 static void ufs_read_cylinder (struct super_block * sb,
30 unsigned cgno, unsigned bitmap_nr) 30 unsigned cgno, unsigned bitmap_nr)
31 { 31 {
32 struct ufs_sb_info * sbi = UFS_SB(sb); 32 struct ufs_sb_info * sbi = UFS_SB(sb);
33 struct ufs_sb_private_info * uspi; 33 struct ufs_sb_private_info * uspi;
34 struct ufs_cg_private_info * ucpi; 34 struct ufs_cg_private_info * ucpi;
35 struct ufs_cylinder_group * ucg; 35 struct ufs_cylinder_group * ucg;
36 unsigned i, j; 36 unsigned i, j;
37 37
38 UFSD("ENTER, cgno %u, bitmap_nr %u\n", 38 UFSD("ENTER, cgno %u, bitmap_nr %u\n", cgno, bitmap_nr);
39 uspi = sbi->s_uspi; 39 uspi = sbi->s_uspi;
40 ucpi = sbi->s_ucpi[bitmap_nr]; 40 ucpi = sbi->s_ucpi[bitmap_nr];
41 ucg = (struct ufs_cylinder_group *)sbi 41 ucg = (struct ufs_cylinder_group *)sbi->s_ucg[cgno]->b_data;
42 42
43 UCPI_UBH(ucpi)->fragment = ufs_cgcmin( 43 UCPI_UBH(ucpi)->fragment = ufs_cgcmin(cgno);
44 UCPI_UBH(ucpi)->count = uspi->s_cgsize 44 UCPI_UBH(ucpi)->count = uspi->s_cgsize >> sb->s_blocksize_bits;
45 /* 45 /*
46 * We have already the first fragment 46 * We have already the first fragment of cylinder group block in buffer
47 */ 47 */
48 UCPI_UBH(ucpi)->bh[0] = sbi->s_ucg[cgn 48 UCPI_UBH(ucpi)->bh[0] = sbi->s_ucg[cgno];
49 for (i = 1; i < UCPI_UBH(ucpi)->count; 49 for (i = 1; i < UCPI_UBH(ucpi)->count; i++)
50 if (!(UCPI_UBH(ucpi)->bh[i] = 50 if (!(UCPI_UBH(ucpi)->bh[i] = sb_bread(sb, UCPI_UBH(ucpi)->fragment + i)))
51 goto failed; 51 goto failed;
52 sbi->s_cgno[bitmap_nr] = cgno; 52 sbi->s_cgno[bitmap_nr] = cgno;
53 53
54 ucpi->c_cgx = fs32_to_cpu(sb, ucg- 54 ucpi->c_cgx = fs32_to_cpu(sb, ucg->cg_cgx);
55 ucpi->c_ncyl = fs16_to_cpu(sb, ucg- 55 ucpi->c_ncyl = fs16_to_cpu(sb, ucg->cg_ncyl);
56 ucpi->c_niblk = fs16_to_cpu(sb, ucg- 56 ucpi->c_niblk = fs16_to_cpu(sb, ucg->cg_niblk);
57 ucpi->c_ndblk = fs32_to_cpu(sb, ucg- 57 ucpi->c_ndblk = fs32_to_cpu(sb, ucg->cg_ndblk);
58 ucpi->c_rotor = fs32_to_cpu(sb, ucg- 58 ucpi->c_rotor = fs32_to_cpu(sb, ucg->cg_rotor);
59 ucpi->c_frotor = fs32_to_cpu(sb, ucg- 59 ucpi->c_frotor = fs32_to_cpu(sb, ucg->cg_frotor);
60 ucpi->c_irotor = fs32_to_cpu(sb, ucg- 60 ucpi->c_irotor = fs32_to_cpu(sb, ucg->cg_irotor);
61 ucpi->c_btotoff = fs32_to_cpu(sb, ucg- 61 ucpi->c_btotoff = fs32_to_cpu(sb, ucg->cg_btotoff);
62 ucpi->c_boff = fs32_to_cpu(sb, ucg- 62 ucpi->c_boff = fs32_to_cpu(sb, ucg->cg_boff);
63 ucpi->c_iusedoff = fs32_to_cpu(sb, ucg 63 ucpi->c_iusedoff = fs32_to_cpu(sb, ucg->cg_iusedoff);
64 ucpi->c_freeoff = fs32_to_cpu(sb, ucg- 64 ucpi->c_freeoff = fs32_to_cpu(sb, ucg->cg_freeoff);
65 ucpi->c_nextfreeoff = fs32_to_cpu(sb, 65 ucpi->c_nextfreeoff = fs32_to_cpu(sb, ucg->cg_nextfreeoff);
66 ucpi->c_clustersumoff = fs32_to_cpu(sb 66 ucpi->c_clustersumoff = fs32_to_cpu(sb, ucg->cg_u.cg_44.cg_clustersumoff);
67 ucpi->c_clusteroff = fs32_to_cpu(sb, u 67 ucpi->c_clusteroff = fs32_to_cpu(sb, ucg->cg_u.cg_44.cg_clusteroff);
68 ucpi->c_nclusterblks = fs32_to_cpu(sb, 68 ucpi->c_nclusterblks = fs32_to_cpu(sb, ucg->cg_u.cg_44.cg_nclusterblks);
69 UFSD("EXIT\n"); 69 UFSD("EXIT\n");
70 return; 70 return;
71 71
72 failed: 72 failed:
73 for (j = 1; j < i; j++) 73 for (j = 1; j < i; j++)
74 brelse (sbi->s_ucg[j]); 74 brelse (sbi->s_ucg[j]);
75 sbi->s_cgno[bitmap_nr] = UFS_CGNO_EMPT 75 sbi->s_cgno[bitmap_nr] = UFS_CGNO_EMPTY;
76 ufs_error (sb, "ufs_read_cylinder", "c 76 ufs_error (sb, "ufs_read_cylinder", "can't read cylinder group block %u", cgno);
77 } 77 }
78 78
79 /* 79 /*
80 * Remove cylinder group from cache, doesn't r 80 * Remove cylinder group from cache, doesn't release memory
81 * allocated for cylinder group (this is done 81 * allocated for cylinder group (this is done at ufs_put_super only).
82 */ 82 */
83 void ufs_put_cylinder (struct super_block * sb 83 void ufs_put_cylinder (struct super_block * sb, unsigned bitmap_nr)
84 { 84 {
85 struct ufs_sb_info * sbi = UFS_SB(sb); 85 struct ufs_sb_info * sbi = UFS_SB(sb);
86 struct ufs_sb_private_info * uspi; 86 struct ufs_sb_private_info * uspi;
87 struct ufs_cg_private_info * ucpi; 87 struct ufs_cg_private_info * ucpi;
88 struct ufs_cylinder_group * ucg; 88 struct ufs_cylinder_group * ucg;
89 unsigned i; 89 unsigned i;
90 90
91 UFSD("ENTER, bitmap_nr %u\n", bitmap_n 91 UFSD("ENTER, bitmap_nr %u\n", bitmap_nr);
92 92
93 uspi = sbi->s_uspi; 93 uspi = sbi->s_uspi;
94 if (sbi->s_cgno[bitmap_nr] == UFS_CGNO 94 if (sbi->s_cgno[bitmap_nr] == UFS_CGNO_EMPTY) {
95 UFSD("EXIT\n"); 95 UFSD("EXIT\n");
96 return; 96 return;
97 } 97 }
98 ucpi = sbi->s_ucpi[bitmap_nr]; 98 ucpi = sbi->s_ucpi[bitmap_nr];
99 ucg = ubh_get_ucg(UCPI_UBH(ucpi)); 99 ucg = ubh_get_ucg(UCPI_UBH(ucpi));
100 100
101 if (uspi->s_ncg > UFS_MAX_GROUP_LOADED 101 if (uspi->s_ncg > UFS_MAX_GROUP_LOADED && bitmap_nr >= sbi->s_cg_loaded) {
102 ufs_panic (sb, "ufs_put_cylind 102 ufs_panic (sb, "ufs_put_cylinder", "internal error");
103 return; 103 return;
104 } 104 }
105 /* 105 /*
106 * rotor is not so important data, so 106 * rotor is not so important data, so we put it to disk
107 * at the end of working with cylinder 107 * at the end of working with cylinder
108 */ 108 */
109 ucg->cg_rotor = cpu_to_fs32(sb, ucpi-> 109 ucg->cg_rotor = cpu_to_fs32(sb, ucpi->c_rotor);
110 ucg->cg_frotor = cpu_to_fs32(sb, ucpi- 110 ucg->cg_frotor = cpu_to_fs32(sb, ucpi->c_frotor);
111 ucg->cg_irotor = cpu_to_fs32(sb, ucpi- 111 ucg->cg_irotor = cpu_to_fs32(sb, ucpi->c_irotor);
112 ubh_mark_buffer_dirty (UCPI_UBH(ucpi)) 112 ubh_mark_buffer_dirty (UCPI_UBH(ucpi));
113 for (i = 1; i < UCPI_UBH(ucpi)->count; 113 for (i = 1; i < UCPI_UBH(ucpi)->count; i++) {
114 brelse (UCPI_UBH(ucpi)->bh[i]) 114 brelse (UCPI_UBH(ucpi)->bh[i]);
115 } 115 }
116 116
117 sbi->s_cgno[bitmap_nr] = UFS_CGNO_EMPT 117 sbi->s_cgno[bitmap_nr] = UFS_CGNO_EMPTY;
118 UFSD("EXIT\n"); 118 UFSD("EXIT\n");
119 } 119 }
120 120
121 /* 121 /*
122 * Find cylinder group in cache and return it 122 * Find cylinder group in cache and return it as pointer.
123 * If cylinder group is not in cache, we will 123 * If cylinder group is not in cache, we will load it from disk.
124 * 124 *
125 * The cache is managed by LRU algorithm. 125 * The cache is managed by LRU algorithm.
126 */ 126 */
127 struct ufs_cg_private_info * ufs_load_cylinder 127 struct ufs_cg_private_info * ufs_load_cylinder (
128 struct super_block * sb, unsigned cgno 128 struct super_block * sb, unsigned cgno)
129 { 129 {
130 struct ufs_sb_info * sbi = UFS_SB(sb); 130 struct ufs_sb_info * sbi = UFS_SB(sb);
131 struct ufs_sb_private_info * uspi; 131 struct ufs_sb_private_info * uspi;
132 struct ufs_cg_private_info * ucpi; 132 struct ufs_cg_private_info * ucpi;
133 unsigned cg, i, j; 133 unsigned cg, i, j;
134 134
135 UFSD("ENTER, cgno %u\n", cgno); 135 UFSD("ENTER, cgno %u\n", cgno);
136 136
137 uspi = sbi->s_uspi; 137 uspi = sbi->s_uspi;
138 if (cgno >= uspi->s_ncg) { 138 if (cgno >= uspi->s_ncg) {
139 ufs_panic (sb, "ufs_load_cylin 139 ufs_panic (sb, "ufs_load_cylinder", "internal error, high number of cg");
140 return NULL; 140 return NULL;
141 } 141 }
142 /* 142 /*
143 * Cylinder group number cg it in cach 143 * Cylinder group number cg it in cache and it was last used
144 */ 144 */
145 if (sbi->s_cgno[0] == cgno) { 145 if (sbi->s_cgno[0] == cgno) {
146 UFSD("EXIT\n"); 146 UFSD("EXIT\n");
147 return sbi->s_ucpi[0]; 147 return sbi->s_ucpi[0];
148 } 148 }
149 /* 149 /*
150 * Number of cylinder groups is not hi 150 * Number of cylinder groups is not higher than UFS_MAX_GROUP_LOADED
151 */ 151 */
152 if (uspi->s_ncg <= UFS_MAX_GROUP_LOADE 152 if (uspi->s_ncg <= UFS_MAX_GROUP_LOADED) {
153 if (sbi->s_cgno[cgno] != UFS_C 153 if (sbi->s_cgno[cgno] != UFS_CGNO_EMPTY) {
154 if (sbi->s_cgno[cgno] 154 if (sbi->s_cgno[cgno] != cgno) {
155 ufs_panic (sb, 155 ufs_panic (sb, "ufs_load_cylinder", "internal error, wrong number of cg in cache");
156 UFSD("EXIT (FA 156 UFSD("EXIT (FAILED)\n");
157 return NULL; 157 return NULL;
158 } 158 }
159 else { 159 else {
160 UFSD("EXIT\n") 160 UFSD("EXIT\n");
161 return sbi->s_ 161 return sbi->s_ucpi[cgno];
162 } 162 }
163 } else { 163 } else {
164 ufs_read_cylinder (sb, 164 ufs_read_cylinder (sb, cgno, cgno);
165 UFSD("EXIT\n"); 165 UFSD("EXIT\n");
166 return sbi->s_ucpi[cgn 166 return sbi->s_ucpi[cgno];
167 } 167 }
168 } 168 }
169 /* 169 /*
170 * Cylinder group number cg is in cach 170 * Cylinder group number cg is in cache but it was not last used,
171 * we will move to the first position 171 * we will move to the first position
172 */ 172 */
173 for (i = 0; i < sbi->s_cg_loaded && sb 173 for (i = 0; i < sbi->s_cg_loaded && sbi->s_cgno[i] != cgno; i++);
174 if (i < sbi->s_cg_loaded && sbi->s_cgn 174 if (i < sbi->s_cg_loaded && sbi->s_cgno[i] == cgno) {
175 cg = sbi->s_cgno[i]; 175 cg = sbi->s_cgno[i];
176 ucpi = sbi->s_ucpi[i]; 176 ucpi = sbi->s_ucpi[i];
177 for (j = i; j > 0; j--) { 177 for (j = i; j > 0; j--) {
178 sbi->s_cgno[j] = sbi-> 178 sbi->s_cgno[j] = sbi->s_cgno[j-1];
179 sbi->s_ucpi[j] = sbi-> 179 sbi->s_ucpi[j] = sbi->s_ucpi[j-1];
180 } 180 }
181 sbi->s_cgno[0] = cg; 181 sbi->s_cgno[0] = cg;
182 sbi->s_ucpi[0] = ucpi; 182 sbi->s_ucpi[0] = ucpi;
183 /* 183 /*
184 * Cylinder group number cg is not in 184 * Cylinder group number cg is not in cache, we will read it from disk
185 * and put it to the first position 185 * and put it to the first position
186 */ 186 */
187 } else { 187 } else {
188 if (sbi->s_cg_loaded < UFS_MAX 188 if (sbi->s_cg_loaded < UFS_MAX_GROUP_LOADED)
189 sbi->s_cg_loaded++; 189 sbi->s_cg_loaded++;
190 else 190 else
191 ufs_put_cylinder (sb, 191 ufs_put_cylinder (sb, UFS_MAX_GROUP_LOADED-1);
192 ucpi = sbi->s_ucpi[sbi->s_cg_l 192 ucpi = sbi->s_ucpi[sbi->s_cg_loaded - 1];
193 for (j = sbi->s_cg_loaded - 1; 193 for (j = sbi->s_cg_loaded - 1; j > 0; j--) {
194 sbi->s_cgno[j] = sbi-> 194 sbi->s_cgno[j] = sbi->s_cgno[j-1];
195 sbi->s_ucpi[j] = sbi-> 195 sbi->s_ucpi[j] = sbi->s_ucpi[j-1];
196 } 196 }
197 sbi->s_ucpi[0] = ucpi; 197 sbi->s_ucpi[0] = ucpi;
198 ufs_read_cylinder (sb, cgno, 0 198 ufs_read_cylinder (sb, cgno, 0);
199 } 199 }
200 UFSD("EXIT\n"); 200 UFSD("EXIT\n");
201 return sbi->s_ucpi[0]; 201 return sbi->s_ucpi[0];
202 } 202 }
203 203
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