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[net-next-2.6.git] / fs / hpfs / ea.c
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1da177e4
LT		 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 "hpfs_fn.h"
10
11/* Remove external extended attributes. ano specifies whether a is a
12 direct sector where eas starts or an anode */
13
14void hpfs_ea_ext_remove(struct super_block *s, secno a, int ano, unsigned len)
15{
16 unsigned pos = 0;
17 while (pos < len) {
18 char ex[4 + 255 + 1 + 8];
19 struct extended_attribute *ea = (struct extended_attribute *)ex;
20 if (pos + 4 > len) {
21 hpfs_error(s, "EAs don't end correctly, %s %08x, len %08x",
22 ano ? "anode" : "sectors", a, len);
23 return;
24 }
25 if (hpfs_ea_read(s, a, ano, pos, 4, ex)) return;
26 if (ea->indirect) {
27 if (ea->valuelen != 8) {
28 hpfs_error(s, "ea->indirect set while ea->valuelen!=8, %s %08x, pos %08x",
29 ano ? "anode" : "sectors", a, pos);
30 return;
31 }
32 if (hpfs_ea_read(s, a, ano, pos + 4, ea->namelen + 9, ex+4))
33 return;
34 hpfs_ea_remove(s, ea_sec(ea), ea->anode, ea_len(ea));
35 }
36 pos += ea->namelen + ea->valuelen + 5;
37 }
38 if (!ano) hpfs_free_sectors(s, a, (len+511) >> 9);
39 else {
40 struct buffer_head *bh;
41 struct anode *anode;
42 if ((anode = hpfs_map_anode(s, a, &bh))) {
43 hpfs_remove_btree(s, &anode->btree);
44 brelse(bh);
45 hpfs_free_sectors(s, a, 1);
46 }
47 }
48}
49
50static char *get_indirect_ea(struct super_block *s, int ano, secno a, int size)
51{
52 char *ret;
53 if (!(ret = kmalloc(size + 1, GFP_NOFS))) {
54 printk("HPFS: out of memory for EA\n");
55 return NULL;
56 }
57 if (hpfs_ea_read(s, a, ano, 0, size, ret)) {
58 kfree(ret);
59 return NULL;
60 }
61 ret[size] = 0;
62 return ret;
63}
64
7e7742ee
AV		 65static void set_indirect_ea(struct super_block *s, int ano, secno a,
66 const char *data, int size)
1da177e4
LT		 67{
68 hpfs_ea_write(s, a, ano, 0, size, data);
69}
70
71/* Read an extended attribute named 'key' into the provided buffer */
72
73int hpfs_read_ea(struct super_block *s, struct fnode *fnode, char *key,
74 char *buf, int size)
75{
76 unsigned pos;
77 int ano, len;
78 secno a;
79 struct extended_attribute *ea;
80 struct extended_attribute *ea_end = fnode_end_ea(fnode);
81 for (ea = fnode_ea(fnode); ea < ea_end; ea = next_ea(ea))
82 if (!strcmp(ea->name, key)) {
83 if (ea->indirect)
84 goto indirect;
85 if (ea->valuelen >= size)
86 return -EINVAL;
87 memcpy(buf, ea_data(ea), ea->valuelen);
88 buf[ea->valuelen] = 0;
89 return 0;
90 }
91 a = fnode->ea_secno;
92 len = fnode->ea_size_l;
93 ano = fnode->ea_anode;
94 pos = 0;
95 while (pos < len) {
96 char ex[4 + 255 + 1 + 8];
97 ea = (struct extended_attribute *)ex;
98 if (pos + 4 > len) {
99 hpfs_error(s, "EAs don't end correctly, %s %08x, len %08x",
100 ano ? "anode" : "sectors", a, len);
101 return -EIO;
102 }
103 if (hpfs_ea_read(s, a, ano, pos, 4, ex)) return -EIO;
104 if (hpfs_ea_read(s, a, ano, pos + 4, ea->namelen + 1 + (ea->indirect ? 8 : 0), ex + 4))
105 return -EIO;
106 if (!strcmp(ea->name, key)) {
107 if (ea->indirect)
108 goto indirect;
109 if (ea->valuelen >= size)
110 return -EINVAL;
111 if (hpfs_ea_read(s, a, ano, pos + 4 + ea->namelen + 1, ea->valuelen, buf))
112 return -EIO;
113 buf[ea->valuelen] = 0;
114 return 0;
115 }
116 pos += ea->namelen + ea->valuelen + 5;
117 }
118 return -ENOENT;
119indirect:
120 if (ea_len(ea) >= size)
121 return -EINVAL;
122 if (hpfs_ea_read(s, ea_sec(ea), ea->anode, 0, ea_len(ea), buf))
123 return -EIO;
124 buf[ea_len(ea)] = 0;
125 return 0;
126}
127
128/* Read an extended attribute named 'key' */
129char *hpfs_get_ea(struct super_block *s, struct fnode *fnode, char *key, int *size)
130{
131 char *ret;
132 unsigned pos;
133 int ano, len;
134 secno a;
135 struct extended_attribute *ea;
136 struct extended_attribute *ea_end = fnode_end_ea(fnode);
137 for (ea = fnode_ea(fnode); ea < ea_end; ea = next_ea(ea))
138 if (!strcmp(ea->name, key)) {
139 if (ea->indirect)
140 return get_indirect_ea(s, ea->anode, ea_sec(ea), *size = ea_len(ea));
141 if (!(ret = kmalloc((*size = ea->valuelen) + 1, GFP_NOFS))) {
142 printk("HPFS: out of memory for EA\n");
143 return NULL;
144 }
145 memcpy(ret, ea_data(ea), ea->valuelen);
146 ret[ea->valuelen] = 0;
147 return ret;
148 }
149 a = fnode->ea_secno;
150 len = fnode->ea_size_l;
151 ano = fnode->ea_anode;
152 pos = 0;
153 while (pos < len) {
154 char ex[4 + 255 + 1 + 8];
155 ea = (struct extended_attribute *)ex;
156 if (pos + 4 > len) {
157 hpfs_error(s, "EAs don't end correctly, %s %08x, len %08x",
158 ano ? "anode" : "sectors", a, len);
159 return NULL;
160 }
161 if (hpfs_ea_read(s, a, ano, pos, 4, ex)) return NULL;
162 if (hpfs_ea_read(s, a, ano, pos + 4, ea->namelen + 1 + (ea->indirect ? 8 : 0), ex + 4))
163 return NULL;
164 if (!strcmp(ea->name, key)) {
165 if (ea->indirect)
166 return get_indirect_ea(s, ea->anode, ea_sec(ea), *size = ea_len(ea));
167 if (!(ret = kmalloc((*size = ea->valuelen) + 1, GFP_NOFS))) {
168 printk("HPFS: out of memory for EA\n");
169 return NULL;
170 }
171 if (hpfs_ea_read(s, a, ano, pos + 4 + ea->namelen + 1, ea->valuelen, ret)) {
172 kfree(ret);
173 return NULL;
174 }
175 ret[ea->valuelen] = 0;
176 return ret;
177 }
178 pos += ea->namelen + ea->valuelen + 5;
179 }
180 return NULL;
181}
182
183/*
184 * Update or create extended attribute 'key' with value 'data'. Note that
185 * when this ea exists, it MUST have the same size as size of data.
186 * This driver can't change sizes of eas ('cause I just don't need it).
187 */
188
7e7742ee
AV		 189void hpfs_set_ea(struct inode *inode, struct fnode *fnode, const char *key,
190 const char *data, int size)
1da177e4
LT		 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_offs) {
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->acl_size_s + fnode->ea_size_s > 0x200) {
18debbbc
RD		 247 hpfs_error(s, "fnode %08lx: ea_offs == %03x, ea_size_s == %03x",
248 (unsigned long)inode->i_ino,
249 fnode->ea_offs, fnode->ea_size_s);
1da177e4
LT		 250 return;
251 }
252 if ((fnode->ea_size_s || !fnode->ea_size_l) &&
253 fnode->ea_offs + fnode->acl_size_s + fnode->ea_size_s + strlen(key) + size + 5 <= 0x200) {
254 ea = fnode_end_ea(fnode);
255 *(char *)ea = 0;
256 ea->namelen = strlen(key);
257 ea->valuelen = size;
258 strcpy(ea->name, key);
259 memcpy(ea_data(ea), data, size);
260 fnode->ea_size_s += strlen(key) + size + 5;
261 goto ret;
262 }
263 /* Most the code here is 99.9993422% unused. I hope there are no bugs.
264 But what .. HPFS.IFS has also bugs in ea management. */
265 if (fnode->ea_size_s && !fnode->ea_size_l) {
266 secno n;
267 struct buffer_head *bh;
268 char *data;
269 if (!(n = hpfs_alloc_sector(s, fno, 1, 0, 1))) return;
270 if (!(data = hpfs_get_sector(s, n, &bh))) {
271 hpfs_free_sectors(s, n, 1);
272 return;
273 }
274 memcpy(data, fnode_ea(fnode), fnode->ea_size_s);
275 fnode->ea_size_l = fnode->ea_size_s;
276 fnode->ea_size_s = 0;
277 fnode->ea_secno = n;
278 fnode->ea_anode = 0;
279 mark_buffer_dirty(bh);
280 brelse(bh);
281 }
282 pos = fnode->ea_size_l + 5 + strlen(key) + size;
283 len = (fnode->ea_size_l + 511) >> 9;
284 if (pos >= 30000) goto bail;
285 while (((pos + 511) >> 9) > len) {
286 if (!len) {
287 if (!(fnode->ea_secno = hpfs_alloc_sector(s, fno, 1, 0, 1)))
288 goto bail;
289 fnode->ea_anode = 0;
290 len++;
291 } else if (!fnode->ea_anode) {
292 if (hpfs_alloc_if_possible(s, fnode->ea_secno + len)) {
293 len++;
294 } else {
295 /* Aargh... don't know how to create ea anodes :-( */
296 /*struct buffer_head *bh;
297 struct anode *anode;
298 anode_secno a_s;
299 if (!(anode = hpfs_alloc_anode(s, fno, &a_s, &bh)))
300 goto bail;
301 anode->up = fno;
302 anode->btree.fnode_parent = 1;
303 anode->btree.n_free_nodes--;
304 anode->btree.n_used_nodes++;
305 anode->btree.first_free += 12;
306 anode->u.external[0].disk_secno = fnode->ea_secno;
307 anode->u.external[0].file_secno = 0;
308 anode->u.external[0].length = len;
309 mark_buffer_dirty(bh);
310 brelse(bh);
311 fnode->ea_anode = 1;
312 fnode->ea_secno = a_s;*/
313 secno new_sec;
314 int i;
315 if (!(new_sec = hpfs_alloc_sector(s, fno, 1, 1 - ((pos + 511) >> 9), 1)))
316 goto bail;
317 for (i = 0; i < len; i++) {
318 struct buffer_head *bh1, *bh2;
319 void *b1, *b2;
320 if (!(b1 = hpfs_map_sector(s, fnode->ea_secno + i, &bh1, len - i - 1))) {
321 hpfs_free_sectors(s, new_sec, (pos + 511) >> 9);
322 goto bail;
323 }
324 if (!(b2 = hpfs_get_sector(s, new_sec + i, &bh2))) {
325 brelse(bh1);
326 hpfs_free_sectors(s, new_sec, (pos + 511) >> 9);
327 goto bail;
328 }
329 memcpy(b2, b1, 512);
330 brelse(bh1);
331 mark_buffer_dirty(bh2);
332 brelse(bh2);
333 }
334 hpfs_free_sectors(s, fnode->ea_secno, len);
335 fnode->ea_secno = new_sec;
336 len = (pos + 511) >> 9;
337 }
338 }
339 if (fnode->ea_anode) {
340 if (hpfs_add_sector_to_btree(s, fnode->ea_secno,
341 0, len) != -1) {
342 len++;
343 } else {
344 goto bail;
345 }
346 }
347 }
348 h[0] = 0;
349 h[1] = strlen(key);
350 h[2] = size & 0xff;
351 h[3] = size >> 8;
352 if (hpfs_ea_write(s, fnode->ea_secno, fnode->ea_anode, fnode->ea_size_l, 4, h)) goto bail;
353 if (hpfs_ea_write(s, fnode->ea_secno, fnode->ea_anode, fnode->ea_size_l + 4, h[1] + 1, key)) goto bail;
354 if (hpfs_ea_write(s, fnode->ea_secno, fnode->ea_anode, fnode->ea_size_l + 5 + h[1], size, data)) goto bail;
355 fnode->ea_size_l = pos;
356 ret:
357 hpfs_i(inode)->i_ea_size += 5 + strlen(key) + size;
358 return;
359 bail:
360 if (fnode->ea_secno)
361 if (fnode->ea_anode) hpfs_truncate_btree(s, fnode->ea_secno, 1, (fnode->ea_size_l + 511) >> 9);
362 else hpfs_free_sectors(s, fnode->ea_secno + ((fnode->ea_size_l + 511) >> 9), len - ((fnode->ea_size_l + 511) >> 9));
363 else fnode->ea_secno = fnode->ea_size_l = 0;
364}
365
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