File: /usr/src/linux/fs/hpfs/ea.c
1 /*
2 * linux/fs/hpfs/ea.c
3 *
4 * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
5 *
6 * handling extended attributes
7 */
8
9 #include <linux/string.h>
10 #include "hpfs_fn.h"
11
12 /* Remove external extended attributes. ano specifies wheter a is a
13 direct sector where eas start 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) {
28 if (ea->valuelen != 8) {
29 hpfs_error(s, "ea->indirect 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->anode, ea_len(ea));
36 }
37 pos += ea->namelen + ea->valuelen + 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 + 1, GFP_KERNEL))) {
55 printk("HPFS: out of memory for EA\n");
56 return NULL;
57 }
58 if (hpfs_ea_read(s, a, ano, 0, size, ret)) {
59 kfree(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, char *data,
67 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 struct extended_attribute *ea;
81 struct extended_attribute *ea_end = fnode_end_ea(fnode);
82 for (ea = fnode_ea(fnode); ea < ea_end; ea = next_ea(ea))
83 if (!strcmp(ea->name, key)) {
84 if (ea->indirect)
85 goto indirect;
86 if (ea->valuelen >= size)
87 return -EINVAL;
88 memcpy(buf, ea_data(ea), ea->valuelen);
89 buf[ea->valuelen] = 0;
90 return 0;
91 }
92 a = fnode->ea_secno;
93 len = fnode->ea_size_l;
94 ano = fnode->ea_anode;
95 pos = 0;
96 while (pos < len) {
97 char ex[4 + 255 + 1 + 8];
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 ? 8 : 0), ex + 4))
106 return -EIO;
107 if (!strcmp(ea->name, key)) {
108 if (ea->indirect)
109 goto indirect;
110 if (ea->valuelen >= size)
111 return -EINVAL;
112 if (hpfs_ea_read(s, a, ano, pos + 4 + ea->namelen + 1, ea->valuelen, buf))
113 return -EIO;
114 buf[ea->valuelen] = 0;
115 return 0;
116 }
117 pos += ea->namelen + ea->valuelen + 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->anode, 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)
141 return get_indirect_ea(s, ea->anode, ea_sec(ea), *size = ea_len(ea));
142 if (!(ret = kmalloc((*size = ea->valuelen) + 1, GFP_KERNEL))) {
143 printk("HPFS: out of memory for EA\n");
144 return NULL;
145 }
146 memcpy(ret, ea_data(ea), ea->valuelen);
147 ret[ea->valuelen] = 0;
148 return ret;
149 }
150 a = fnode->ea_secno;
151 len = fnode->ea_size_l;
152 ano = fnode->ea_anode;
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 ? 8 : 0), ex + 4))
164 return NULL;
165 if (!strcmp(ea->name, key)) {
166 if (ea->indirect)
167 return get_indirect_ea(s, ea->anode, ea_sec(ea), *size = ea_len(ea));
168 if (!(ret = kmalloc((*size = ea->valuelen) + 1, GFP_KERNEL))) {
169 printk("HPFS: 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, ret)) {
173 kfree(ret);
174 return NULL;
175 }
176 ret[ea->valuelen] = 0;
177 return ret;
178 }
179 pos += ea->namelen + ea->valuelen + 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, char *key, char *data, int size)
191 {
192 fnode_secno fno = inode->i_ino;
193 struct super_block *s = inode->i_sb;
194 unsigned pos;
195 int ano, len;
196 secno a;
197 unsigned char h[4];
198 struct extended_attribute *ea;
199 struct extended_attribute *ea_end = fnode_end_ea(fnode);
200 for (ea = fnode_ea(fnode); ea < ea_end; ea = next_ea(ea))
201 if (!strcmp(ea->name, key)) {
202 if (ea->indirect) {
203 if (ea_len(ea) == size)
204 set_indirect_ea(s, ea->anode, ea_sec(ea), data, size);
205 } else if (ea->valuelen == size) {
206 memcpy(ea_data(ea), data, size);
207 }
208 return;
209 }
210 a = fnode->ea_secno;
211 len = fnode->ea_size_l;
212 ano = fnode->ea_anode;
213 pos = 0;
214 while (pos < len) {
215 char ex[4 + 255 + 1 + 8];
216 ea = (struct extended_attribute *)ex;
217 if (pos + 4 > len) {
218 hpfs_error(s, "EAs don't end correctly, %s %08x, len %08x",
219 ano ? "anode" : "sectors", a, len);
220 return;
221 }
222 if (hpfs_ea_read(s, a, ano, pos, 4, ex)) return;
223 if (hpfs_ea_read(s, a, ano, pos + 4, ea->namelen + 1 + (ea->indirect ? 8 : 0), ex + 4))
224 return;
225 if (!strcmp(ea->name, key)) {
226 if (ea->indirect) {
227 if (ea_len(ea) == size)
228 set_indirect_ea(s, ea->anode, ea_sec(ea), data, size);
229 }
230 else {
231 if (ea->valuelen == size)
232 hpfs_ea_write(s, a, ano, pos + 4 + ea->namelen + 1, size, data);
233 }
234 return;
235 }
236 pos += ea->namelen + ea->valuelen + 5;
237 }
238 if (!fnode->ea_size_s) {
239 /*if (fnode->ea_size_s) {
240 hpfs_error(s, "fnode %08x: ea_size_s == %03x, ea_offs == 0",
241 inode->i_ino, fnode->ea_size_s);
242 return;
243 }*/
244 fnode->ea_offs = 0xc4;
245 }
246 if (fnode->ea_offs < 0xc4 || fnode->ea_offs + fnode->ea_size_s > 0x200) {
247 hpfs_error(s, "fnode %08x: ea_offs == %03x, ea_size_s == %03x",
248 inode->i_ino, fnode->ea_offs, fnode->ea_size_s);
249 return;
250 }
251 if ((fnode->ea_size_s || !fnode->ea_size_l) &&
252 fnode->ea_offs + fnode->ea_size_s + strlen(key) + size + 5 <= 0x200) {
253 /* I'm not sure ... maybe we overwrite ACL here. I have no info
254 on it right now :-( */
255 ea = fnode_end_ea(fnode);
256 *(char *)ea = 0;
257 ea->namelen = strlen(key);
258 ea->valuelen = size;
259 strcpy(ea->name, key);
260 memcpy(ea_data(ea), data, size);
261 fnode->ea_size_s += strlen(key) + size + 5;
262 goto ret;
263 }
264 /* Most the code here is 99.9993422% unused. I hope there are no bugs.
265 But what .. HPFS.IFS has also bugs in ea management. */
266 if (fnode->ea_size_s && !fnode->ea_size_l) {
267 secno n;
268 struct buffer_head *bh;
269 char *data;
270 if (!(n = hpfs_alloc_sector(s, fno, 1, 0, 1))) return;
271 if (!(data = hpfs_get_sector(s, n, &bh))) {
272 hpfs_free_sectors(s, n, 1);
273 return;
274 }
275 memcpy(data, fnode_ea(fnode), fnode->ea_size_s);
276 fnode->ea_size_l = fnode->ea_size_s;
277 fnode->ea_size_s = 0;
278 fnode->ea_secno = n;
279 fnode->ea_anode = 0;
280 mark_buffer_dirty(bh);
281 brelse(bh);
282 }
283 pos = fnode->ea_size_l + 5 + strlen(key) + size;
284 len = (fnode->ea_size_l + 511) >> 9;
285 if (pos >= 30000) goto bail;
286 while (((pos + 511) >> 9) > len) {
287 if (!len) {
288 if (!(fnode->ea_secno = hpfs_alloc_sector(s, fno, 1, 0, 1)))
289 goto bail;
290 fnode->ea_anode = 0;
291 len++;
292 } else if (!fnode->ea_anode) {
293 if (hpfs_alloc_if_possible(s, fnode->ea_secno + len)) {
294 len++;
295 } else {
296 /* Aargh... don't know how to create ea anodes :-( */
297 /*struct buffer_head *bh;
298 struct anode *anode;
299 anode_secno a_s;
300 if (!(anode = hpfs_alloc_anode(s, fno, &a_s, &bh)))
301 goto bail;
302 anode->up = fno;
303 anode->btree.fnode_parent = 1;
304 anode->btree.n_free_nodes--;
305 anode->btree.n_used_nodes++;
306 anode->btree.first_free += 12;
307 anode->u.external[0].disk_secno = fnode->ea_secno;
308 anode->u.external[0].file_secno = 0;
309 anode->u.external[0].length = len;
310 mark_buffer_dirty(bh);
311 brelse(bh);
312 fnode->ea_anode = 1;
313 fnode->ea_secno = a_s;*/
314 secno new_sec;
315 int i;
316 if (!(new_sec = hpfs_alloc_sector(s, fno, 1, 1 - ((pos + 511) >> 9), 1)))
317 goto bail;
318 for (i = 0; i < len; i++) {
319 struct buffer_head *bh1, *bh2;
320 void *b1, *b2;
321 if (!(b1 = hpfs_map_sector(s, fnode->ea_secno + i, &bh1, len - i - 1))) {
322 hpfs_free_sectors(s, new_sec, (pos + 511) >> 9);
323 goto bail;
324 }
325 if (!(b2 = hpfs_get_sector(s, new_sec + i, &bh2))) {
326 brelse(bh1);
327 hpfs_free_sectors(s, new_sec, (pos + 511) >> 9);
328 goto bail;
329 }
330 memcpy(b2, b1, 512);
331 brelse(bh1);
332 mark_buffer_dirty(bh2);
333 brelse(bh2);
334 }
335 hpfs_free_sectors(s, fnode->ea_secno, len);
336 fnode->ea_secno = new_sec;
337 len = (pos + 511) >> 9;
338 }
339 }
340 if (fnode->ea_anode) {
341 if (hpfs_add_sector_to_btree(s, fnode->ea_secno,
342 0, len) != -1) {
343 len++;
344 } else {
345 goto bail;
346 }
347 }
348 }
349 h[0] = 0;
350 h[1] = strlen(key);
351 h[2] = size & 0xff;
352 h[3] = size >> 8;
353 if (hpfs_ea_write(s, fnode->ea_secno, fnode->ea_anode, fnode->ea_size_l, 4, h)) goto bail;
354 if (hpfs_ea_write(s, fnode->ea_secno, fnode->ea_anode, fnode->ea_size_l + 4, h[1] + 1, key)) goto bail;
355 if (hpfs_ea_write(s, fnode->ea_secno, fnode->ea_anode, fnode->ea_size_l + 5 + h[1], size, data)) goto bail;
356 fnode->ea_size_l = pos;
357 ret:
358 inode->i_hpfs_ea_size += 5 + strlen(key) + size;
359 return;
360 bail:
361 if (fnode->ea_secno)
362 if (fnode->ea_anode) hpfs_truncate_btree(s, fnode->ea_secno, 1, (fnode->ea_size_l + 511) >> 9);
363 else hpfs_free_sectors(s, fnode->ea_secno + ((fnode->ea_size_l + 511) >> 9), len - ((fnode->ea_size_l + 511) >> 9));
364 else fnode->ea_secno = fnode->ea_size_l = 0;
365 }
366
367