1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * linux/fs/hpfs/ea.c |
4 | * |
5 | * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999 |
6 | * |
7 | * handling extended attributes |
8 | */ |
9 | |
10 | #include "hpfs_fn.h" |
11 | |
12 | /* Remove external extended attributes. ano specifies whether a is a |
13 | direct sector where eas starts or an anode */ |
14 | |
15 | void hpfs_ea_ext_remove(struct super_block *s, secno a, int ano, unsigned len) |
16 | { |
17 | unsigned pos = 0; |
18 | while (pos < len) { |
19 | char ex[4 + 255 + 1 + 8]; |
20 | struct extended_attribute *ea = (struct extended_attribute *)ex; |
21 | if (pos + 4 > len) { |
22 | hpfs_error(s, "EAs don't end correctly, %s %08x, len %08x" , |
23 | ano ? "anode" : "sectors" , a, len); |
24 | return; |
25 | } |
26 | if (hpfs_ea_read(s, a, ano, pos, 4, ex)) return; |
27 | if (ea_indirect(ea)) { |
28 | if (ea_valuelen(ea) != 8) { |
29 | hpfs_error(s, "ea_indirect(ea) set while ea->valuelen!=8, %s %08x, pos %08x" , |
30 | ano ? "anode" : "sectors" , a, pos); |
31 | return; |
32 | } |
33 | if (hpfs_ea_read(s, a, ano, pos + 4, ea->namelen + 9, ex+4)) |
34 | return; |
35 | hpfs_ea_remove(s, ea_sec(ea), ea_in_anode(ea), ea_len(ea)); |
36 | } |
37 | pos += ea->namelen + ea_valuelen(ea) + 5; |
38 | } |
39 | if (!ano) hpfs_free_sectors(s, a, (len+511) >> 9); |
40 | else { |
41 | struct buffer_head *bh; |
42 | struct anode *anode; |
43 | if ((anode = hpfs_map_anode(s, a, &bh))) { |
44 | hpfs_remove_btree(s, &anode->btree); |
45 | brelse(bh); |
46 | hpfs_free_sectors(s, a, 1); |
47 | } |
48 | } |
49 | } |
50 | |
51 | static char *get_indirect_ea(struct super_block *s, int ano, secno a, int size) |
52 | { |
53 | char *ret; |
54 | if (!(ret = kmalloc(size: size + 1, GFP_NOFS))) { |
55 | pr_err("out of memory for EA\n" ); |
56 | return NULL; |
57 | } |
58 | if (hpfs_ea_read(s, a, ano, 0, size, ret)) { |
59 | kfree(objp: ret); |
60 | return NULL; |
61 | } |
62 | ret[size] = 0; |
63 | return ret; |
64 | } |
65 | |
66 | static void set_indirect_ea(struct super_block *s, int ano, secno a, |
67 | const char *data, int size) |
68 | { |
69 | hpfs_ea_write(s, a, ano, 0, size, data); |
70 | } |
71 | |
72 | /* Read an extended attribute named 'key' into the provided buffer */ |
73 | |
74 | int hpfs_read_ea(struct super_block *s, struct fnode *fnode, char *key, |
75 | char *buf, int size) |
76 | { |
77 | unsigned pos; |
78 | int ano, len; |
79 | secno a; |
80 | char ex[4 + 255 + 1 + 8]; |
81 | struct extended_attribute *ea; |
82 | struct extended_attribute *ea_end = fnode_end_ea(fnode); |
83 | for (ea = fnode_ea(fnode); ea < ea_end; ea = next_ea(ea)) |
84 | if (!strcmp(ea->name, key)) { |
85 | if (ea_indirect(ea)) |
86 | goto indirect; |
87 | if (ea_valuelen(ea) >= size) |
88 | return -EINVAL; |
89 | memcpy(buf, ea_data(ea), ea_valuelen(ea)); |
90 | buf[ea_valuelen(ea)] = 0; |
91 | return 0; |
92 | } |
93 | a = le32_to_cpu(fnode->ea_secno); |
94 | len = le32_to_cpu(fnode->ea_size_l); |
95 | ano = fnode_in_anode(p: fnode); |
96 | pos = 0; |
97 | while (pos < len) { |
98 | ea = (struct extended_attribute *)ex; |
99 | if (pos + 4 > len) { |
100 | hpfs_error(s, "EAs don't end correctly, %s %08x, len %08x" , |
101 | ano ? "anode" : "sectors" , a, len); |
102 | return -EIO; |
103 | } |
104 | if (hpfs_ea_read(s, a, ano, pos, 4, ex)) return -EIO; |
105 | if (hpfs_ea_read(s, a, ano, pos + 4, ea->namelen + 1 + (ea_indirect(ea) ? 8 : 0), ex + 4)) |
106 | return -EIO; |
107 | if (!strcmp(ea->name, key)) { |
108 | if (ea_indirect(ea)) |
109 | goto indirect; |
110 | if (ea_valuelen(ea) >= size) |
111 | return -EINVAL; |
112 | if (hpfs_ea_read(s, a, ano, pos + 4 + ea->namelen + 1, ea_valuelen(ea), buf)) |
113 | return -EIO; |
114 | buf[ea_valuelen(ea)] = 0; |
115 | return 0; |
116 | } |
117 | pos += ea->namelen + ea_valuelen(ea) + 5; |
118 | } |
119 | return -ENOENT; |
120 | indirect: |
121 | if (ea_len(ea) >= size) |
122 | return -EINVAL; |
123 | if (hpfs_ea_read(s, ea_sec(ea), ea_in_anode(ea), 0, ea_len(ea), buf)) |
124 | return -EIO; |
125 | buf[ea_len(ea)] = 0; |
126 | return 0; |
127 | } |
128 | |
129 | /* Read an extended attribute named 'key' */ |
130 | char *hpfs_get_ea(struct super_block *s, struct fnode *fnode, char *key, int *size) |
131 | { |
132 | char *ret; |
133 | unsigned pos; |
134 | int ano, len; |
135 | secno a; |
136 | struct extended_attribute *ea; |
137 | struct extended_attribute *ea_end = fnode_end_ea(fnode); |
138 | for (ea = fnode_ea(fnode); ea < ea_end; ea = next_ea(ea)) |
139 | if (!strcmp(ea->name, key)) { |
140 | if (ea_indirect(ea)) |
141 | return get_indirect_ea(s, ano: ea_in_anode(ea), a: ea_sec(ea), size: *size = ea_len(ea)); |
142 | if (!(ret = kmalloc(size: (*size = ea_valuelen(ea)) + 1, GFP_NOFS))) { |
143 | pr_err("out of memory for EA\n" ); |
144 | return NULL; |
145 | } |
146 | memcpy(ret, ea_data(ea), ea_valuelen(ea)); |
147 | ret[ea_valuelen(ea)] = 0; |
148 | return ret; |
149 | } |
150 | a = le32_to_cpu(fnode->ea_secno); |
151 | len = le32_to_cpu(fnode->ea_size_l); |
152 | ano = fnode_in_anode(p: fnode); |
153 | pos = 0; |
154 | while (pos < len) { |
155 | char ex[4 + 255 + 1 + 8]; |
156 | ea = (struct extended_attribute *)ex; |
157 | if (pos + 4 > len) { |
158 | hpfs_error(s, "EAs don't end correctly, %s %08x, len %08x" , |
159 | ano ? "anode" : "sectors" , a, len); |
160 | return NULL; |
161 | } |
162 | if (hpfs_ea_read(s, a, ano, pos, 4, ex)) return NULL; |
163 | if (hpfs_ea_read(s, a, ano, pos + 4, ea->namelen + 1 + (ea_indirect(ea) ? 8 : 0), ex + 4)) |
164 | return NULL; |
165 | if (!strcmp(ea->name, key)) { |
166 | if (ea_indirect(ea)) |
167 | return get_indirect_ea(s, ano: ea_in_anode(ea), a: ea_sec(ea), size: *size = ea_len(ea)); |
168 | if (!(ret = kmalloc(size: (*size = ea_valuelen(ea)) + 1, GFP_NOFS))) { |
169 | pr_err("out of memory for EA\n" ); |
170 | return NULL; |
171 | } |
172 | if (hpfs_ea_read(s, a, ano, pos + 4 + ea->namelen + 1, ea_valuelen(ea), ret)) { |
173 | kfree(objp: ret); |
174 | return NULL; |
175 | } |
176 | ret[ea_valuelen(ea)] = 0; |
177 | return ret; |
178 | } |
179 | pos += ea->namelen + ea_valuelen(ea) + 5; |
180 | } |
181 | return NULL; |
182 | } |
183 | |
184 | /* |
185 | * Update or create extended attribute 'key' with value 'data'. Note that |
186 | * when this ea exists, it MUST have the same size as size of data. |
187 | * This driver can't change sizes of eas ('cause I just don't need it). |
188 | */ |
189 | |
190 | void hpfs_set_ea(struct inode *inode, struct fnode *fnode, const char *key, |
191 | const char *data, int size) |
192 | { |
193 | fnode_secno fno = inode->i_ino; |
194 | struct super_block *s = inode->i_sb; |
195 | unsigned pos; |
196 | int ano, len; |
197 | secno a; |
198 | unsigned char h[4]; |
199 | struct extended_attribute *ea; |
200 | struct extended_attribute *ea_end = fnode_end_ea(fnode); |
201 | for (ea = fnode_ea(fnode); ea < ea_end; ea = next_ea(ea)) |
202 | if (!strcmp(ea->name, key)) { |
203 | if (ea_indirect(ea)) { |
204 | if (ea_len(ea) == size) |
205 | set_indirect_ea(s, ano: ea_in_anode(ea), a: ea_sec(ea), data, size); |
206 | } else if (ea_valuelen(ea) == size) { |
207 | memcpy(ea_data(ea), data, size); |
208 | } |
209 | return; |
210 | } |
211 | a = le32_to_cpu(fnode->ea_secno); |
212 | len = le32_to_cpu(fnode->ea_size_l); |
213 | ano = fnode_in_anode(p: fnode); |
214 | pos = 0; |
215 | while (pos < len) { |
216 | char ex[4 + 255 + 1 + 8]; |
217 | ea = (struct extended_attribute *)ex; |
218 | if (pos + 4 > len) { |
219 | hpfs_error(s, "EAs don't end correctly, %s %08x, len %08x" , |
220 | ano ? "anode" : "sectors" , a, len); |
221 | return; |
222 | } |
223 | if (hpfs_ea_read(s, a, ano, pos, 4, ex)) return; |
224 | if (hpfs_ea_read(s, a, ano, pos + 4, ea->namelen + 1 + (ea_indirect(ea) ? 8 : 0), ex + 4)) |
225 | return; |
226 | if (!strcmp(ea->name, key)) { |
227 | if (ea_indirect(ea)) { |
228 | if (ea_len(ea) == size) |
229 | set_indirect_ea(s, ano: ea_in_anode(ea), a: ea_sec(ea), data, size); |
230 | } |
231 | else { |
232 | if (ea_valuelen(ea) == size) |
233 | hpfs_ea_write(s, a, ano, pos + 4 + ea->namelen + 1, size, data); |
234 | } |
235 | return; |
236 | } |
237 | pos += ea->namelen + ea_valuelen(ea) + 5; |
238 | } |
239 | if (!le16_to_cpu(fnode->ea_offs)) { |
240 | /*if (le16_to_cpu(fnode->ea_size_s)) { |
241 | hpfs_error(s, "fnode %08x: ea_size_s == %03x, ea_offs == 0", |
242 | inode->i_ino, le16_to_cpu(fnode->ea_size_s)); |
243 | return; |
244 | }*/ |
245 | fnode->ea_offs = cpu_to_le16(0xc4); |
246 | } |
247 | if (le16_to_cpu(fnode->ea_offs) < 0xc4 || le16_to_cpu(fnode->ea_offs) + le16_to_cpu(fnode->acl_size_s) + le16_to_cpu(fnode->ea_size_s) > 0x200) { |
248 | hpfs_error(s, "fnode %08lx: ea_offs == %03x, ea_size_s == %03x" , |
249 | (unsigned long)inode->i_ino, |
250 | le16_to_cpu(fnode->ea_offs), le16_to_cpu(fnode->ea_size_s)); |
251 | return; |
252 | } |
253 | if ((le16_to_cpu(fnode->ea_size_s) || !le32_to_cpu(fnode->ea_size_l)) && |
254 | le16_to_cpu(fnode->ea_offs) + le16_to_cpu(fnode->acl_size_s) + le16_to_cpu(fnode->ea_size_s) + strlen(key) + size + 5 <= 0x200) { |
255 | ea = fnode_end_ea(fnode); |
256 | *(char *)ea = 0; |
257 | ea->namelen = strlen(key); |
258 | ea->valuelen_lo = size; |
259 | ea->valuelen_hi = size >> 8; |
260 | strcpy(p: ea->name, q: key); |
261 | memcpy(ea_data(ea), data, size); |
262 | fnode->ea_size_s = cpu_to_le16(le16_to_cpu(fnode->ea_size_s) + strlen(key) + size + 5); |
263 | goto ret; |
264 | } |
265 | /* Most the code here is 99.9993422% unused. I hope there are no bugs. |
266 | But what .. HPFS.IFS has also bugs in ea management. */ |
267 | if (le16_to_cpu(fnode->ea_size_s) && !le32_to_cpu(fnode->ea_size_l)) { |
268 | secno n; |
269 | struct buffer_head *bh; |
270 | char *data; |
271 | if (!(n = hpfs_alloc_sector(s, fno, 1, 0))) return; |
272 | if (!(data = hpfs_get_sector(s, n, &bh))) { |
273 | hpfs_free_sectors(s, n, 1); |
274 | return; |
275 | } |
276 | memcpy(data, fnode_ea(fnode), le16_to_cpu(fnode->ea_size_s)); |
277 | fnode->ea_size_l = cpu_to_le32(le16_to_cpu(fnode->ea_size_s)); |
278 | fnode->ea_size_s = cpu_to_le16(0); |
279 | fnode->ea_secno = cpu_to_le32(n); |
280 | fnode->flags &= ~FNODE_anode; |
281 | mark_buffer_dirty(bh); |
282 | brelse(bh); |
283 | } |
284 | pos = le32_to_cpu(fnode->ea_size_l) + 5 + strlen(key) + size; |
285 | len = (le32_to_cpu(fnode->ea_size_l) + 511) >> 9; |
286 | if (pos >= 30000) goto bail; |
287 | while (((pos + 511) >> 9) > len) { |
288 | if (!len) { |
289 | secno q = hpfs_alloc_sector(s, fno, 1, 0); |
290 | if (!q) goto bail; |
291 | fnode->ea_secno = cpu_to_le32(q); |
292 | fnode->flags &= ~FNODE_anode; |
293 | len++; |
294 | } else if (!fnode_in_anode(p: fnode)) { |
295 | if (hpfs_alloc_if_possible(s, le32_to_cpu(fnode->ea_secno) + len)) { |
296 | len++; |
297 | } else { |
298 | /* Aargh... don't know how to create ea anodes :-( */ |
299 | /*struct buffer_head *bh; |
300 | struct anode *anode; |
301 | anode_secno a_s; |
302 | if (!(anode = hpfs_alloc_anode(s, fno, &a_s, &bh))) |
303 | goto bail; |
304 | anode->up = cpu_to_le32(fno); |
305 | anode->btree.fnode_parent = 1; |
306 | anode->btree.n_free_nodes--; |
307 | anode->btree.n_used_nodes++; |
308 | anode->btree.first_free = cpu_to_le16(le16_to_cpu(anode->btree.first_free) + 12); |
309 | anode->u.external[0].disk_secno = cpu_to_le32(le32_to_cpu(fnode->ea_secno)); |
310 | anode->u.external[0].file_secno = cpu_to_le32(0); |
311 | anode->u.external[0].length = cpu_to_le32(len); |
312 | mark_buffer_dirty(bh); |
313 | brelse(bh); |
314 | fnode->flags |= FNODE_anode; |
315 | fnode->ea_secno = cpu_to_le32(a_s);*/ |
316 | secno new_sec; |
317 | int i; |
318 | if (!(new_sec = hpfs_alloc_sector(s, fno, 1, 1 - ((pos + 511) >> 9)))) |
319 | goto bail; |
320 | for (i = 0; i < len; i++) { |
321 | struct buffer_head *bh1, *bh2; |
322 | void *b1, *b2; |
323 | if (!(b1 = hpfs_map_sector(s, le32_to_cpu(fnode->ea_secno) + i, &bh1, len - i - 1))) { |
324 | hpfs_free_sectors(s, new_sec, (pos + 511) >> 9); |
325 | goto bail; |
326 | } |
327 | if (!(b2 = hpfs_get_sector(s, new_sec + i, &bh2))) { |
328 | brelse(bh: bh1); |
329 | hpfs_free_sectors(s, new_sec, (pos + 511) >> 9); |
330 | goto bail; |
331 | } |
332 | memcpy(b2, b1, 512); |
333 | brelse(bh: bh1); |
334 | mark_buffer_dirty(bh: bh2); |
335 | brelse(bh: bh2); |
336 | } |
337 | hpfs_free_sectors(s, le32_to_cpu(fnode->ea_secno), len); |
338 | fnode->ea_secno = cpu_to_le32(new_sec); |
339 | len = (pos + 511) >> 9; |
340 | } |
341 | } |
342 | if (fnode_in_anode(p: fnode)) { |
343 | if (hpfs_add_sector_to_btree(s, le32_to_cpu(fnode->ea_secno), |
344 | 0, len) != -1) { |
345 | len++; |
346 | } else { |
347 | goto bail; |
348 | } |
349 | } |
350 | } |
351 | h[0] = 0; |
352 | h[1] = strlen(key); |
353 | h[2] = size & 0xff; |
354 | h[3] = size >> 8; |
355 | if (hpfs_ea_write(s, le32_to_cpu(fnode->ea_secno), fnode_in_anode(p: fnode), le32_to_cpu(fnode->ea_size_l), 4, h)) goto bail; |
356 | if (hpfs_ea_write(s, le32_to_cpu(fnode->ea_secno), fnode_in_anode(p: fnode), le32_to_cpu(fnode->ea_size_l) + 4, h[1] + 1, key)) goto bail; |
357 | if (hpfs_ea_write(s, le32_to_cpu(fnode->ea_secno), fnode_in_anode(p: fnode), le32_to_cpu(fnode->ea_size_l) + 5 + h[1], size, data)) goto bail; |
358 | fnode->ea_size_l = cpu_to_le32(pos); |
359 | ret: |
360 | hpfs_i(inode)->i_ea_size += 5 + strlen(key) + size; |
361 | return; |
362 | bail: |
363 | if (le32_to_cpu(fnode->ea_secno)) |
364 | if (fnode_in_anode(p: fnode)) hpfs_truncate_btree(s, le32_to_cpu(fnode->ea_secno), 1, (le32_to_cpu(fnode->ea_size_l) + 511) >> 9); |
365 | else hpfs_free_sectors(s, le32_to_cpu(fnode->ea_secno) + ((le32_to_cpu(fnode->ea_size_l) + 511) >> 9), len - ((le32_to_cpu(fnode->ea_size_l) + 511) >> 9)); |
366 | else fnode->ea_secno = fnode->ea_size_l = cpu_to_le32(0); |
367 | } |
368 | |
369 | |