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-rw-r--r--fs/hpfs/ea.c363
1 files changed, 363 insertions, 0 deletions
diff --git a/fs/hpfs/ea.c b/fs/hpfs/ea.c
new file mode 100644
index 000000000000..66339dc030e4
--- /dev/null
+++ b/fs/hpfs/ea.c
@@ -0,0 +1,363 @@
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
65static void set_indirect_ea(struct super_block *s, int ano, secno a, char *data,
66 int size)
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
189void hpfs_set_ea(struct inode *inode, struct fnode *fnode, char *key, char *data, int size)
190{
191 fnode_secno fno = inode->i_ino;
192 struct super_block *s = inode->i_sb;
193 unsigned pos;
194 int ano, len;
195 secno a;
196 unsigned char h[4];
197 struct extended_attribute *ea;
198 struct extended_attribute *ea_end = fnode_end_ea(fnode);
199 for (ea = fnode_ea(fnode); ea < ea_end; ea = next_ea(ea))
200 if (!strcmp(ea->name, key)) {
201 if (ea->indirect) {
202 if (ea_len(ea) == size)
203 set_indirect_ea(s, ea->anode, ea_sec(ea), data, size);
204 } else if (ea->valuelen == size) {
205 memcpy(ea_data(ea), data, size);
206 }
207 return;
208 }
209 a = fnode->ea_secno;
210 len = fnode->ea_size_l;
211 ano = fnode->ea_anode;
212 pos = 0;
213 while (pos < len) {
214 char ex[4 + 255 + 1 + 8];
215 ea = (struct extended_attribute *)ex;
216 if (pos + 4 > len) {
217 hpfs_error(s, "EAs don't end correctly, %s %08x, len %08x",
218 ano ? "anode" : "sectors", a, len);
219 return;
220 }
221 if (hpfs_ea_read(s, a, ano, pos, 4, ex)) return;
222 if (hpfs_ea_read(s, a, ano, pos + 4, ea->namelen + 1 + (ea->indirect ? 8 : 0), ex + 4))
223 return;
224 if (!strcmp(ea->name, key)) {
225 if (ea->indirect) {
226 if (ea_len(ea) == size)
227 set_indirect_ea(s, ea->anode, ea_sec(ea), data, size);
228 }
229 else {
230 if (ea->valuelen == size)
231 hpfs_ea_write(s, a, ano, pos + 4 + ea->namelen + 1, size, data);
232 }
233 return;
234 }
235 pos += ea->namelen + ea->valuelen + 5;
236 }
237 if (!fnode->ea_offs) {
238 /*if (fnode->ea_size_s) {
239 hpfs_error(s, "fnode %08x: ea_size_s == %03x, ea_offs == 0",
240 inode->i_ino, fnode->ea_size_s);
241 return;
242 }*/
243 fnode->ea_offs = 0xc4;
244 }
245 if (fnode->ea_offs < 0xc4 || fnode->ea_offs + fnode->acl_size_s + fnode->ea_size_s > 0x200) {
246 hpfs_error(s, "fnode %08x: ea_offs == %03x, ea_size_s == %03x",
247 inode->i_ino, fnode->ea_offs, fnode->ea_size_s);
248 return;
249 }
250 if ((fnode->ea_size_s || !fnode->ea_size_l) &&
251 fnode->ea_offs + fnode->acl_size_s + fnode->ea_size_s + strlen(key) + size + 5 <= 0x200) {
252 ea = fnode_end_ea(fnode);
253 *(char *)ea = 0;
254 ea->namelen = strlen(key);
255 ea->valuelen = size;
256 strcpy(ea->name, key);
257 memcpy(ea_data(ea), data, size);
258 fnode->ea_size_s += strlen(key) + size + 5;
259 goto ret;
260 }
261 /* Most the code here is 99.9993422% unused. I hope there are no bugs.
262 But what .. HPFS.IFS has also bugs in ea management. */
263 if (fnode->ea_size_s && !fnode->ea_size_l) {
264 secno n;
265 struct buffer_head *bh;
266 char *data;
267 if (!(n = hpfs_alloc_sector(s, fno, 1, 0, 1))) return;
268 if (!(data = hpfs_get_sector(s, n, &bh))) {
269 hpfs_free_sectors(s, n, 1);
270 return;
271 }
272 memcpy(data, fnode_ea(fnode), fnode->ea_size_s);
273 fnode->ea_size_l = fnode->ea_size_s;
274 fnode->ea_size_s = 0;
275 fnode->ea_secno = n;
276 fnode->ea_anode = 0;
277 mark_buffer_dirty(bh);
278 brelse(bh);
279 }
280 pos = fnode->ea_size_l + 5 + strlen(key) + size;
281 len = (fnode->ea_size_l + 511) >> 9;
282 if (pos >= 30000) goto bail;
283 while (((pos + 511) >> 9) > len) {
284 if (!len) {
285 if (!(fnode->ea_secno = hpfs_alloc_sector(s, fno, 1, 0, 1)))
286 goto bail;
287 fnode->ea_anode = 0;
288 len++;
289 } else if (!fnode->ea_anode) {
290 if (hpfs_alloc_if_possible(s, fnode->ea_secno + len)) {
291 len++;
292 } else {
293 /* Aargh... don't know how to create ea anodes :-( */
294 /*struct buffer_head *bh;
295 struct anode *anode;
296 anode_secno a_s;
297 if (!(anode = hpfs_alloc_anode(s, fno, &a_s, &bh)))
298 goto bail;
299 anode->up = fno;
300 anode->btree.fnode_parent = 1;
301 anode->btree.n_free_nodes--;
302 anode->btree.n_used_nodes++;
303 anode->btree.first_free += 12;
304 anode->u.external[0].disk_secno = fnode->ea_secno;
305 anode->u.external[0].file_secno = 0;
306 anode->u.external[0].length = len;
307 mark_buffer_dirty(bh);
308 brelse(bh);
309 fnode->ea_anode = 1;
310 fnode->ea_secno = a_s;*/
311 secno new_sec;
312 int i;
313 if (!(new_sec = hpfs_alloc_sector(s, fno, 1, 1 - ((pos + 511) >> 9), 1)))
314 goto bail;
315 for (i = 0; i < len; i++) {
316 struct buffer_head *bh1, *bh2;
317 void *b1, *b2;
318 if (!(b1 = hpfs_map_sector(s, fnode->ea_secno + i, &bh1, len - i - 1))) {
319 hpfs_free_sectors(s, new_sec, (pos + 511) >> 9);
320 goto bail;
321 }
322 if (!(b2 = hpfs_get_sector(s, new_sec + i, &bh2))) {
323 brelse(bh1);
324 hpfs_free_sectors(s, new_sec, (pos + 511) >> 9);
325 goto bail;
326 }
327 memcpy(b2, b1, 512);
328 brelse(bh1);
329 mark_buffer_dirty(bh2);
330 brelse(bh2);
331 }
332 hpfs_free_sectors(s, fnode->ea_secno, len);
333 fnode->ea_secno = new_sec;
334 len = (pos + 511) >> 9;
335 }
336 }
337 if (fnode->ea_anode) {
338 if (hpfs_add_sector_to_btree(s, fnode->ea_secno,
339 0, len) != -1) {
340 len++;
341 } else {
342 goto bail;
343 }
344 }
345 }
346 h[0] = 0;
347 h[1] = strlen(key);
348 h[2] = size & 0xff;
349 h[3] = size >> 8;
350 if (hpfs_ea_write(s, fnode->ea_secno, fnode->ea_anode, fnode->ea_size_l, 4, h)) goto bail;
351 if (hpfs_ea_write(s, fnode->ea_secno, fnode->ea_anode, fnode->ea_size_l + 4, h[1] + 1, key)) goto bail;
352 if (hpfs_ea_write(s, fnode->ea_secno, fnode->ea_anode, fnode->ea_size_l + 5 + h[1], size, data)) goto bail;
353 fnode->ea_size_l = pos;
354 ret:
355 hpfs_i(inode)->i_ea_size += 5 + strlen(key) + size;
356 return;
357 bail:
358 if (fnode->ea_secno)
359 if (fnode->ea_anode) hpfs_truncate_btree(s, fnode->ea_secno, 1, (fnode->ea_size_l + 511) >> 9);
360 else hpfs_free_sectors(s, fnode->ea_secno + ((fnode->ea_size_l + 511) >> 9), len - ((fnode->ea_size_l + 511) >> 9));
361 else fnode->ea_secno = fnode->ea_size_l = 0;
362}
363
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