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