1 // SPDX-License-Identifier: GPL-2.0 1
2 /*
3 * linux/fs/hpfs/map.c
4 *
5 * Mikulas Patocka (mikulas@artax.karlin.mff.
6 *
7 * mapping structures to memory with some min
8 */
9
10 #include "hpfs_fn.h"
11
12 __le32 *hpfs_map_dnode_bitmap(struct super_blo
13 {
14 return hpfs_map_4sectors(s, hpfs_sb(s)
15 }
16
17 __le32 *hpfs_map_bitmap(struct super_block *s,
18 struct quad_buffer_he
19 {
20 secno sec;
21 __le32 *ret;
22 unsigned n_bands = (hpfs_sb(s)->sb_fs_
23 if (hpfs_sb(s)->sb_chk) if (bmp_block
24 hpfs_error(s, "hpfs_map_bitmap
25 return NULL;
26 }
27 sec = le32_to_cpu(hpfs_sb(s)->sb_bmp_d
28 if (!sec || sec > hpfs_sb(s)->sb_fs_si
29 hpfs_error(s, "invalid bitmap
30 return NULL;
31 }
32 ret = hpfs_map_4sectors(s, sec, qbh, 4
33 if (ret) hpfs_prefetch_bitmap(s, bmp_b
34 return ret;
35 }
36
37 void hpfs_prefetch_bitmap(struct super_block *
38 {
39 unsigned to_prefetch, next_prefetch;
40 unsigned n_bands = (hpfs_sb(s)->sb_fs_
41 if (unlikely(bmp_block >= n_bands))
42 return;
43 to_prefetch = le32_to_cpu(hpfs_sb(s)->
44 if (unlikely(bmp_block + 1 >= n_bands)
45 next_prefetch = 0;
46 else
47 next_prefetch = le32_to_cpu(hp
48 hpfs_prefetch_sectors(s, to_prefetch,
49 }
50
51 /*
52 * Load first code page into kernel memory, re
53 * first 128 bytes are uppercasing table for c
54 * lowercasing table
55 */
56
57 unsigned char *hpfs_load_code_page(struct supe
58 {
59 struct buffer_head *bh;
60 secno cpds;
61 unsigned cpi;
62 unsigned char *ptr;
63 unsigned char *cp_table;
64 int i;
65 struct code_page_data *cpd;
66 struct code_page_directory *cp = hpfs_
67 if (!cp) return NULL;
68 if (le32_to_cpu(cp->magic) != CP_DIR_M
69 pr_err("Code page directory ma
70 le32_to_cpu(cp->magic)
71 brelse(bh);
72 return NULL;
73 }
74 if (!le32_to_cpu(cp->n_code_pages)) {
75 pr_err("n_code_pages == 0\n");
76 brelse(bh);
77 return NULL;
78 }
79 cpds = le32_to_cpu(cp->array[0].code_p
80 cpi = le16_to_cpu(cp->array[0].index);
81 brelse(bh);
82
83 if (cpi >= 3) {
84 pr_err("Code page index out of
85 return NULL;
86 }
87
88 if (!(cpd = hpfs_map_sector(s, cpds, &
89 if (le16_to_cpu(cpd->offs[cpi]) > 0x17
90 pr_err("Code page index out of
91 brelse(bh);
92 return NULL;
93 }
94 ptr = (unsigned char *)cpd + le16_to_c
95 if (!(cp_table = kmalloc(256, GFP_KERN
96 pr_err("out of memory for code
97 brelse(bh);
98 return NULL;
99 }
100 memcpy(cp_table, ptr, 128);
101 brelse(bh);
102
103 /* Try to build lowercasing table from
104
105 for (i=128; i<256; i++) cp_table[i]=i;
106 for (i=128; i<256; i++) if (cp_table[i
107 cp_table[cp_table[i-128]] = i;
108
109 return cp_table;
110 }
111
112 __le32 *hpfs_load_bitmap_directory(struct supe
113 {
114 struct buffer_head *bh;
115 int n = (hpfs_sb(s)->sb_fs_size + 0x20
116 int i;
117 __le32 *b;
118 if (!(b = kmalloc_array(n, 512, GFP_KE
119 pr_err("can't allocate memory
120 return NULL;
121 }
122 for (i=0;i<n;i++) {
123 __le32 *d = hpfs_map_sector(s,
124 if (!d) {
125 kfree(b);
126 return NULL;
127 }
128 memcpy((char *)b + 512 * i, d,
129 brelse(bh);
130 }
131 return b;
132 }
133
134 void hpfs_load_hotfix_map(struct super_block *
135 {
136 struct quad_buffer_head qbh;
137 __le32 *directory;
138 u32 n_hotfixes, n_used_hotfixes;
139 unsigned i;
140
141 n_hotfixes = le32_to_cpu(spareblock->n
142 n_used_hotfixes = le32_to_cpu(spareblo
143
144 if (n_hotfixes > 256 || n_used_hotfixe
145 hpfs_error(s, "invalid number
146 return;
147 }
148 if (!(directory = hpfs_map_4sectors(s,
149 hpfs_error(s, "can't load hotf
150 return;
151 }
152 for (i = 0; i < n_used_hotfixes; i++)
153 hpfs_sb(s)->hotfix_from[i] = l
154 hpfs_sb(s)->hotfix_to[i] = le3
155 }
156 hpfs_sb(s)->n_hotfixes = n_used_hotfix
157 hpfs_brelse4(&qbh);
158 }
159
160 /*
161 * Load fnode to memory
162 */
163
164 struct fnode *hpfs_map_fnode(struct super_bloc
165 {
166 struct fnode *fnode;
167 if (hpfs_sb(s)->sb_chk) if (hpfs_chk_s
168 return NULL;
169 }
170 if ((fnode = hpfs_map_sector(s, ino, b
171 if (hpfs_sb(s)->sb_chk) {
172 struct extended_attrib
173 struct extended_attrib
174 if (le32_to_cpu(fnode-
175 hpfs_error(s,
176 (unsig
177 goto bail;
178 }
179 if (!fnode_is_dir(fnod
180 if ((unsigned)
181 (bp_intern
182 hpfs_e
183 "ba
184 (u
185 goto b
186 }
187 if (le16_to_cp
188 8 + fnode-
189 hpfs_e
190 "b
191 (u
192 goto b
193 }
194 }
195 if (le16_to_cpu(fnode-
196 le16_to_cpu(fnode->
197 hpfs_error(s,
198 "bad E
199 (unsig
200 le16_t
201 goto bail;
202 }
203 ea = fnode_ea(fnode);
204 ea_end = fnode_end_ea(
205 while (ea != ea_end) {
206 if (ea > ea_en
207 hpfs_e
208
209 goto b
210 }
211 ea = next_ea(e
212 }
213 }
214 }
215 return fnode;
216 bail:
217 brelse(*bhp);
218 return NULL;
219 }
220
221 struct anode *hpfs_map_anode(struct super_bloc
222 {
223 struct anode *anode;
224 if (hpfs_sb(s)->sb_chk) if (hpfs_chk_s
225 if ((anode = hpfs_map_sector(s, ano, b
226 if (hpfs_sb(s)->sb_chk) {
227 if (le32_to_cpu(anode-
228 hpfs_error(s,
229 goto bail;
230 }
231 if (le32_to_cpu(anode-
232 hpfs_error(s,
233 goto bail;
234 }
235 if ((unsigned)anode->b
236 (bp_internal(&anod
237 hpfs_error(s,
238 goto bail;
239 }
240 if (le16_to_cpu(anode-
241 8 + anode->btree.n
242 hpfs_error(s,
243 goto bail;
244 }
245 }
246 return anode;
247 bail:
248 brelse(*bhp);
249 return NULL;
250 }
251
252 /*
253 * Load dnode to memory and do some checks
254 */
255
256 struct dnode *hpfs_map_dnode(struct super_bloc
257 struct quad_buffe
258 {
259 struct dnode *dnode;
260 if (hpfs_sb(s)->sb_chk) {
261 if (hpfs_chk_sectors(s, secno,
262 if (secno & 3) {
263 hpfs_error(s, "dnode %
264 return NULL;
265 }
266 }
267 if ((dnode = hpfs_map_4sectors(s, secn
268 if (hpfs_sb(s)->sb_chk) {
269 unsigned p, pp = 0;
270 unsigned char *d = (un
271 int b = 0;
272 if (le32_to_cpu(dnode-
273 hpfs_error(s,
274 goto bail;
275 }
276 if (le32_to_cpu(dnode-
277 hpfs_error(s,
278 /* Check dirents - bad
279 loops or shooting t
280 if (le32_to_cpu(dnode-
281 hpfs_error(s,
282 goto bail;
283 }
284 for (p = 20; p < le32_
285 struct hpfs_di
286 if (le16_to_cp
287 hpfs_e
288 goto b
289 }
290 if (((31 + de-
291 if (((
292 hpfs_e
293 goto b
294 }
295 ok:
296 if (hpfs_sb(s)
297 if (de->down)
298 hpfs_e
299 goto b
300 }
301 pp = p;
302
303 }
304 if (p != le32_to_cpu(d
305 hpfs_error(s,
306 goto bail;
307 }
308 if (d[pp + 30] != 1 ||
309 hpfs_error(s,
310 goto bail;
311 }
312 if (b == 3)
313 pr_err("unbala
314 secno)
315 }
316 return dnode;
317 bail:
318 hpfs_brelse4(qbh);
319 return NULL;
320 }
321
322 dnode_secno hpfs_fnode_dno(struct super_block
323 {
324 struct buffer_head *bh;
325 struct fnode *fnode;
326 dnode_secno dno;
327
328 fnode = hpfs_map_fnode(s, ino, &bh);
329 if (!fnode)
330 return 0;
331
332 dno = le32_to_cpu(fnode->u.external[0]
333 brelse(bh);
334 return dno;
335 }
336
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