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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/fs/hpfs/dnode.c
4 *
5 * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
6 *
7 * handling directory dnode tree - adding, deleteing & searching for dirents
8 */
9
10#include "hpfs_fn.h"
11
12static loff_t get_pos(struct dnode *d, struct hpfs_dirent *fde)
13{
14 struct hpfs_dirent *de;
15 struct hpfs_dirent *de_end = dnode_end_de(d);
16 int i = 1;
17 for (de = dnode_first_de(d); de < de_end; de = de_next_de(de)) {
18 if (de == fde) return ((loff_t) le32_to_cpu(d->self) << 4) | (loff_t)i;
19 i++;
20 }
21 pr_info("%s(): not_found\n", __func__);
22 return ((loff_t)le32_to_cpu(d->self) << 4) | (loff_t)1;
23}
24
25int hpfs_add_pos(struct inode *inode, loff_t *pos)
26{
27 struct hpfs_inode_info *hpfs_inode = hpfs_i(inode);
28 int i = 0;
29 loff_t **ppos;
30
31 if (hpfs_inode->i_rddir_off)
32 for (; hpfs_inode->i_rddir_off[i]; i++)
33 if (hpfs_inode->i_rddir_off[i] == pos)
34 return 0;
35 if (!(i&0x0f)) {
36 if (!(ppos = kmalloc((i+0x11) * sizeof(loff_t*), GFP_NOFS))) {
37 pr_err("out of memory for position list\n");
38 return -ENOMEM;
39 }
40 if (hpfs_inode->i_rddir_off) {
41 memcpy(ppos, hpfs_inode->i_rddir_off, i * sizeof(loff_t));
42 kfree(hpfs_inode->i_rddir_off);
43 }
44 hpfs_inode->i_rddir_off = ppos;
45 }
46 hpfs_inode->i_rddir_off[i] = pos;
47 hpfs_inode->i_rddir_off[i + 1] = NULL;
48 return 0;
49}
50
51void hpfs_del_pos(struct inode *inode, loff_t *pos)
52{
53 struct hpfs_inode_info *hpfs_inode = hpfs_i(inode);
54 loff_t **i, **j;
55
56 if (!hpfs_inode->i_rddir_off) goto not_f;
57 for (i = hpfs_inode->i_rddir_off; *i; i++) if (*i == pos) goto fnd;
58 goto not_f;
59 fnd:
60 for (j = i + 1; *j; j++) ;
61 *i = *(j - 1);
62 *(j - 1) = NULL;
63 if (j - 1 == hpfs_inode->i_rddir_off) {
64 kfree(hpfs_inode->i_rddir_off);
65 hpfs_inode->i_rddir_off = NULL;
66 }
67 return;
68 not_f:
69 /*pr_warn("position pointer %p->%08x not found\n",
70 pos, (int)*pos);*/
71 return;
72}
73
74static void for_all_poss(struct inode *inode, void (*f)(loff_t *, loff_t, loff_t),
75 loff_t p1, loff_t p2)
76{
77 struct hpfs_inode_info *hpfs_inode = hpfs_i(inode);
78 loff_t **i;
79
80 if (!hpfs_inode->i_rddir_off) return;
81 for (i = hpfs_inode->i_rddir_off; *i; i++) (*f)(*i, p1, p2);
82 return;
83}
84
85static void hpfs_pos_subst(loff_t *p, loff_t f, loff_t t)
86{
87 if (*p == f) *p = t;
88}
89
90/*void hpfs_hpfs_pos_substd(loff_t *p, loff_t f, loff_t t)
91{
92 if ((*p & ~0x3f) == (f & ~0x3f)) *p = (t & ~0x3f) | (*p & 0x3f);
93}*/
94
95static void hpfs_pos_ins(loff_t *p, loff_t d, loff_t c)
96{
97 if ((*p & ~0x3f) == (d & ~0x3f) && (*p & 0x3f) >= (d & 0x3f)) {
98 int n = (*p & 0x3f) + c;
99 if (n > 0x3f)
100 pr_err("%s(): %08x + %d\n",
101 __func__, (int)*p, (int)c >> 8);
102 else
103 *p = (*p & ~0x3f) | n;
104 }
105}
106
107static void hpfs_pos_del(loff_t *p, loff_t d, loff_t c)
108{
109 if ((*p & ~0x3f) == (d & ~0x3f) && (*p & 0x3f) >= (d & 0x3f)) {
110 int n = (*p & 0x3f) - c;
111 if (n < 1)
112 pr_err("%s(): %08x - %d\n",
113 __func__, (int)*p, (int)c >> 8);
114 else
115 *p = (*p & ~0x3f) | n;
116 }
117}
118
119static struct hpfs_dirent *dnode_pre_last_de(struct dnode *d)
120{
121 struct hpfs_dirent *de, *de_end, *dee = NULL, *deee = NULL;
122 de_end = dnode_end_de(d);
123 for (de = dnode_first_de(d); de < de_end; de = de_next_de(de)) {
124 deee = dee; dee = de;
125 }
126 return deee;
127}
128
129static struct hpfs_dirent *dnode_last_de(struct dnode *d)
130{
131 struct hpfs_dirent *de, *de_end, *dee = NULL;
132 de_end = dnode_end_de(d);
133 for (de = dnode_first_de(d); de < de_end; de = de_next_de(de)) {
134 dee = de;
135 }
136 return dee;
137}
138
139static void set_last_pointer(struct super_block *s, struct dnode *d, dnode_secno ptr)
140{
141 struct hpfs_dirent *de;
142 if (!(de = dnode_last_de(d))) {
143 hpfs_error(s, "set_last_pointer: empty dnode %08x", le32_to_cpu(d->self));
144 return;
145 }
146 if (hpfs_sb(s)->sb_chk) {
147 if (de->down) {
148 hpfs_error(s, "set_last_pointer: dnode %08x has already last pointer %08x",
149 le32_to_cpu(d->self), de_down_pointer(de));
150 return;
151 }
152 if (le16_to_cpu(de->length) != 32) {
153 hpfs_error(s, "set_last_pointer: bad last dirent in dnode %08x", le32_to_cpu(d->self));
154 return;
155 }
156 }
157 if (ptr) {
158 le32_add_cpu(&d->first_free, 4);
159 if (le32_to_cpu(d->first_free) > 2048) {
160 hpfs_error(s, "set_last_pointer: too long dnode %08x", le32_to_cpu(d->self));
161 le32_add_cpu(&d->first_free, -4);
162 return;
163 }
164 de->length = cpu_to_le16(36);
165 de->down = 1;
166 *(__le32 *)((char *)de + 32) = cpu_to_le32(ptr);
167 }
168}
169
170/* Add an entry to dnode and don't care if it grows over 2048 bytes */
171
172struct hpfs_dirent *hpfs_add_de(struct super_block *s, struct dnode *d,
173 const unsigned char *name,
174 unsigned namelen, secno down_ptr)
175{
176 struct hpfs_dirent *de;
177 struct hpfs_dirent *de_end = dnode_end_de(d);
178 unsigned d_size = de_size(namelen, down_ptr);
179 for (de = dnode_first_de(d); de < de_end; de = de_next_de(de)) {
180 int c = hpfs_compare_names(s, name, namelen, de->name, de->namelen, de->last);
181 if (!c) {
182 hpfs_error(s, "name (%c,%d) already exists in dnode %08x", *name, namelen, le32_to_cpu(d->self));
183 return NULL;
184 }
185 if (c < 0) break;
186 }
187 memmove((char *)de + d_size, de, (char *)de_end - (char *)de);
188 memset(de, 0, d_size);
189 if (down_ptr) {
190 *(__le32 *)((char *)de + d_size - 4) = cpu_to_le32(down_ptr);
191 de->down = 1;
192 }
193 de->length = cpu_to_le16(d_size);
194 de->not_8x3 = hpfs_is_name_long(name, namelen);
195 de->namelen = namelen;
196 memcpy(de->name, name, namelen);
197 le32_add_cpu(&d->first_free, d_size);
198 return de;
199}
200
201/* Delete dirent and don't care about its subtree */
202
203static void hpfs_delete_de(struct super_block *s, struct dnode *d,
204 struct hpfs_dirent *de)
205{
206 if (de->last) {
207 hpfs_error(s, "attempt to delete last dirent in dnode %08x", le32_to_cpu(d->self));
208 return;
209 }
210 d->first_free = cpu_to_le32(le32_to_cpu(d->first_free) - le16_to_cpu(de->length));
211 memmove(de, de_next_de(de), le32_to_cpu(d->first_free) + (char *)d - (char *)de);
212}
213
214static void fix_up_ptrs(struct super_block *s, struct dnode *d)
215{
216 struct hpfs_dirent *de;
217 struct hpfs_dirent *de_end = dnode_end_de(d);
218 dnode_secno dno = le32_to_cpu(d->self);
219 for (de = dnode_first_de(d); de < de_end; de = de_next_de(de))
220 if (de->down) {
221 struct quad_buffer_head qbh;
222 struct dnode *dd;
223 if ((dd = hpfs_map_dnode(s, de_down_pointer(de), &qbh))) {
224 if (le32_to_cpu(dd->up) != dno || dd->root_dnode) {
225 dd->up = cpu_to_le32(dno);
226 dd->root_dnode = 0;
227 hpfs_mark_4buffers_dirty(&qbh);
228 }
229 hpfs_brelse4(&qbh);
230 }
231 }
232}
233
234/* Add an entry to dnode and do dnode splitting if required */
235
236static int hpfs_add_to_dnode(struct inode *i, dnode_secno dno,
237 const unsigned char *name, unsigned namelen,
238 struct hpfs_dirent *new_de, dnode_secno down_ptr)
239{
240 struct quad_buffer_head qbh, qbh1, qbh2;
241 struct dnode *d, *ad, *rd, *nd = NULL;
242 dnode_secno adno, rdno;
243 struct hpfs_dirent *de;
244 struct hpfs_dirent nde;
245 unsigned char *nname;
246 int h;
247 int pos;
248 struct buffer_head *bh;
249 struct fnode *fnode;
250 int c1, c2 = 0;
251 if (!(nname = kmalloc(256, GFP_NOFS))) {
252 pr_err("out of memory, can't add to dnode\n");
253 return 1;
254 }
255 go_up:
256 if (namelen >= 256) {
257 hpfs_error(i->i_sb, "%s(): namelen == %d", __func__, namelen);
258 kfree(nd);
259 kfree(nname);
260 return 1;
261 }
262 if (!(d = hpfs_map_dnode(i->i_sb, dno, &qbh))) {
263 kfree(nd);
264 kfree(nname);
265 return 1;
266 }
267 go_up_a:
268 if (hpfs_sb(i->i_sb)->sb_chk)
269 if (hpfs_stop_cycles(i->i_sb, dno, &c1, &c2, "hpfs_add_to_dnode")) {
270 hpfs_brelse4(&qbh);
271 kfree(nd);
272 kfree(nname);
273 return 1;
274 }
275 if (le32_to_cpu(d->first_free) + de_size(namelen, down_ptr) <= 2048) {
276 loff_t t;
277 copy_de(de=hpfs_add_de(i->i_sb, d, name, namelen, down_ptr), new_de);
278 t = get_pos(d, de);
279 for_all_poss(i, hpfs_pos_ins, t, 1);
280 for_all_poss(i, hpfs_pos_subst, 4, t);
281 for_all_poss(i, hpfs_pos_subst, 5, t + 1);
282 hpfs_mark_4buffers_dirty(&qbh);
283 hpfs_brelse4(&qbh);
284 kfree(nd);
285 kfree(nname);
286 return 0;
287 }
288 if (!nd) if (!(nd = kmalloc(0x924, GFP_NOFS))) {
289 /* 0x924 is a max size of dnode after adding a dirent with
290 max name length. We alloc this only once. There must
291 not be any error while splitting dnodes, otherwise the
292 whole directory, not only file we're adding, would
293 be lost. */
294 pr_err("out of memory for dnode splitting\n");
295 hpfs_brelse4(&qbh);
296 kfree(nname);
297 return 1;
298 }
299 memcpy(nd, d, le32_to_cpu(d->first_free));
300 copy_de(de = hpfs_add_de(i->i_sb, nd, name, namelen, down_ptr), new_de);
301 for_all_poss(i, hpfs_pos_ins, get_pos(nd, de), 1);
302 h = ((char *)dnode_last_de(nd) - (char *)nd) / 2 + 10;
303 if (!(ad = hpfs_alloc_dnode(i->i_sb, le32_to_cpu(d->up), &adno, &qbh1))) {
304 hpfs_error(i->i_sb, "unable to alloc dnode - dnode tree will be corrupted");
305 hpfs_brelse4(&qbh);
306 kfree(nd);
307 kfree(nname);
308 return 1;
309 }
310 i->i_size += 2048;
311 i->i_blocks += 4;
312 pos = 1;
313 for (de = dnode_first_de(nd); (char *)de_next_de(de) - (char *)nd < h; de = de_next_de(de)) {
314 copy_de(hpfs_add_de(i->i_sb, ad, de->name, de->namelen, de->down ? de_down_pointer(de) : 0), de);
315 for_all_poss(i, hpfs_pos_subst, ((loff_t)dno << 4) | pos, ((loff_t)adno << 4) | pos);
316 pos++;
317 }
318 copy_de(new_de = &nde, de);
319 memcpy(nname, de->name, de->namelen);
320 name = nname;
321 namelen = de->namelen;
322 for_all_poss(i, hpfs_pos_subst, ((loff_t)dno << 4) | pos, 4);
323 down_ptr = adno;
324 set_last_pointer(i->i_sb, ad, de->down ? de_down_pointer(de) : 0);
325 de = de_next_de(de);
326 memmove((char *)nd + 20, de, le32_to_cpu(nd->first_free) + (char *)nd - (char *)de);
327 le32_add_cpu(&nd->first_free, -((char *)de - (char *)nd - 20));
328 memcpy(d, nd, le32_to_cpu(nd->first_free));
329 for_all_poss(i, hpfs_pos_del, (loff_t)dno << 4, pos);
330 fix_up_ptrs(i->i_sb, ad);
331 if (!d->root_dnode) {
332 ad->up = d->up;
333 dno = le32_to_cpu(ad->up);
334 hpfs_mark_4buffers_dirty(&qbh);
335 hpfs_brelse4(&qbh);
336 hpfs_mark_4buffers_dirty(&qbh1);
337 hpfs_brelse4(&qbh1);
338 goto go_up;
339 }
340 if (!(rd = hpfs_alloc_dnode(i->i_sb, le32_to_cpu(d->up), &rdno, &qbh2))) {
341 hpfs_error(i->i_sb, "unable to alloc dnode - dnode tree will be corrupted");
342 hpfs_brelse4(&qbh);
343 hpfs_brelse4(&qbh1);
344 kfree(nd);
345 kfree(nname);
346 return 1;
347 }
348 i->i_size += 2048;
349 i->i_blocks += 4;
350 rd->root_dnode = 1;
351 rd->up = d->up;
352 if (!(fnode = hpfs_map_fnode(i->i_sb, le32_to_cpu(d->up), &bh))) {
353 hpfs_free_dnode(i->i_sb, rdno);
354 hpfs_brelse4(&qbh);
355 hpfs_brelse4(&qbh1);
356 hpfs_brelse4(&qbh2);
357 kfree(nd);
358 kfree(nname);
359 return 1;
360 }
361 fnode->u.external[0].disk_secno = cpu_to_le32(rdno);
362 mark_buffer_dirty(bh);
363 brelse(bh);
364 hpfs_i(i)->i_dno = rdno;
365 d->up = ad->up = cpu_to_le32(rdno);
366 d->root_dnode = ad->root_dnode = 0;
367 hpfs_mark_4buffers_dirty(&qbh);
368 hpfs_brelse4(&qbh);
369 hpfs_mark_4buffers_dirty(&qbh1);
370 hpfs_brelse4(&qbh1);
371 qbh = qbh2;
372 set_last_pointer(i->i_sb, rd, dno);
373 dno = rdno;
374 d = rd;
375 goto go_up_a;
376}
377
378/*
379 * Add an entry to directory btree.
380 * I hate such crazy directory structure.
381 * It's easy to read but terrible to write.
382 * I wrote this directory code 4 times.
383 * I hope, now it's finally bug-free.
384 */
385
386int hpfs_add_dirent(struct inode *i,
387 const unsigned char *name, unsigned namelen,
388 struct hpfs_dirent *new_de)
389{
390 struct hpfs_inode_info *hpfs_inode = hpfs_i(i);
391 struct dnode *d;
392 struct hpfs_dirent *de, *de_end;
393 struct quad_buffer_head qbh;
394 dnode_secno dno;
395 int c;
396 int c1, c2 = 0;
397 dno = hpfs_inode->i_dno;
398 down:
399 if (hpfs_sb(i->i_sb)->sb_chk)
400 if (hpfs_stop_cycles(i->i_sb, dno, &c1, &c2, "hpfs_add_dirent")) return 1;
401 if (!(d = hpfs_map_dnode(i->i_sb, dno, &qbh))) return 1;
402 de_end = dnode_end_de(d);
403 for (de = dnode_first_de(d); de < de_end; de = de_next_de(de)) {
404 if (!(c = hpfs_compare_names(i->i_sb, name, namelen, de->name, de->namelen, de->last))) {
405 hpfs_brelse4(&qbh);
406 return -1;
407 }
408 if (c < 0) {
409 if (de->down) {
410 dno = de_down_pointer(de);
411 hpfs_brelse4(&qbh);
412 goto down;
413 }
414 break;
415 }
416 }
417 hpfs_brelse4(&qbh);
418 if (hpfs_check_free_dnodes(i->i_sb, FREE_DNODES_ADD)) {
419 c = 1;
420 goto ret;
421 }
422 c = hpfs_add_to_dnode(i, dno, name, namelen, new_de, 0);
423 ret:
424 return c;
425}
426
427/*
428 * Find dirent with higher name in 'from' subtree and move it to 'to' dnode.
429 * Return the dnode we moved from (to be checked later if it's empty)
430 */
431
432static secno move_to_top(struct inode *i, dnode_secno from, dnode_secno to)
433{
434 dnode_secno dno, ddno;
435 dnode_secno chk_up = to;
436 struct dnode *dnode;
437 struct quad_buffer_head qbh;
438 struct hpfs_dirent *de, *nde;
439 int a;
440 loff_t t;
441 int c1, c2 = 0;
442 dno = from;
443 while (1) {
444 if (hpfs_sb(i->i_sb)->sb_chk)
445 if (hpfs_stop_cycles(i->i_sb, dno, &c1, &c2, "move_to_top"))
446 return 0;
447 if (!(dnode = hpfs_map_dnode(i->i_sb, dno, &qbh))) return 0;
448 if (hpfs_sb(i->i_sb)->sb_chk) {
449 if (le32_to_cpu(dnode->up) != chk_up) {
450 hpfs_error(i->i_sb, "move_to_top: up pointer from %08x should be %08x, is %08x",
451 dno, chk_up, le32_to_cpu(dnode->up));
452 hpfs_brelse4(&qbh);
453 return 0;
454 }
455 chk_up = dno;
456 }
457 if (!(de = dnode_last_de(dnode))) {
458 hpfs_error(i->i_sb, "move_to_top: dnode %08x has no last de", dno);
459 hpfs_brelse4(&qbh);
460 return 0;
461 }
462 if (!de->down) break;
463 dno = de_down_pointer(de);
464 hpfs_brelse4(&qbh);
465 }
466 while (!(de = dnode_pre_last_de(dnode))) {
467 dnode_secno up = le32_to_cpu(dnode->up);
468 hpfs_brelse4(&qbh);
469 hpfs_free_dnode(i->i_sb, dno);
470 i->i_size -= 2048;
471 i->i_blocks -= 4;
472 for_all_poss(i, hpfs_pos_subst, ((loff_t)dno << 4) | 1, 5);
473 if (up == to) return to;
474 if (!(dnode = hpfs_map_dnode(i->i_sb, up, &qbh))) return 0;
475 if (dnode->root_dnode) {
476 hpfs_error(i->i_sb, "move_to_top: got to root_dnode while moving from %08x to %08x", from, to);
477 hpfs_brelse4(&qbh);
478 return 0;
479 }
480 de = dnode_last_de(dnode);
481 if (!de || !de->down) {
482 hpfs_error(i->i_sb, "move_to_top: dnode %08x doesn't point down to %08x", up, dno);
483 hpfs_brelse4(&qbh);
484 return 0;
485 }
486 le32_add_cpu(&dnode->first_free, -4);
487 le16_add_cpu(&de->length, -4);
488 de->down = 0;
489 hpfs_mark_4buffers_dirty(&qbh);
490 dno = up;
491 }
492 t = get_pos(dnode, de);
493 for_all_poss(i, hpfs_pos_subst, t, 4);
494 for_all_poss(i, hpfs_pos_subst, t + 1, 5);
495 if (!(nde = kmalloc(le16_to_cpu(de->length), GFP_NOFS))) {
496 hpfs_error(i->i_sb, "out of memory for dirent - directory will be corrupted");
497 hpfs_brelse4(&qbh);
498 return 0;
499 }
500 memcpy(nde, de, le16_to_cpu(de->length));
501 ddno = de->down ? de_down_pointer(de) : 0;
502 hpfs_delete_de(i->i_sb, dnode, de);
503 set_last_pointer(i->i_sb, dnode, ddno);
504 hpfs_mark_4buffers_dirty(&qbh);
505 hpfs_brelse4(&qbh);
506 a = hpfs_add_to_dnode(i, to, nde->name, nde->namelen, nde, from);
507 kfree(nde);
508 if (a) return 0;
509 return dno;
510}
511
512/*
513 * Check if a dnode is empty and delete it from the tree
514 * (chkdsk doesn't like empty dnodes)
515 */
516
517static void delete_empty_dnode(struct inode *i, dnode_secno dno)
518{
519 struct hpfs_inode_info *hpfs_inode = hpfs_i(i);
520 struct quad_buffer_head qbh;
521 struct dnode *dnode;
522 dnode_secno down, up, ndown;
523 int p;
524 struct hpfs_dirent *de;
525 int c1, c2 = 0;
526 try_it_again:
527 if (hpfs_stop_cycles(i->i_sb, dno, &c1, &c2, "delete_empty_dnode")) return;
528 if (!(dnode = hpfs_map_dnode(i->i_sb, dno, &qbh))) return;
529 if (le32_to_cpu(dnode->first_free) > 56) goto end;
530 if (le32_to_cpu(dnode->first_free) == 52 || le32_to_cpu(dnode->first_free) == 56) {
531 struct hpfs_dirent *de_end;
532 int root = dnode->root_dnode;
533 up = le32_to_cpu(dnode->up);
534 de = dnode_first_de(dnode);
535 down = de->down ? de_down_pointer(de) : 0;
536 if (hpfs_sb(i->i_sb)->sb_chk) if (root && !down) {
537 hpfs_error(i->i_sb, "delete_empty_dnode: root dnode %08x is empty", dno);
538 goto end;
539 }
540 hpfs_brelse4(&qbh);
541 hpfs_free_dnode(i->i_sb, dno);
542 i->i_size -= 2048;
543 i->i_blocks -= 4;
544 if (root) {
545 struct fnode *fnode;
546 struct buffer_head *bh;
547 struct dnode *d1;
548 struct quad_buffer_head qbh1;
549 if (hpfs_sb(i->i_sb)->sb_chk)
550 if (up != i->i_ino) {
551 hpfs_error(i->i_sb,
552 "bad pointer to fnode, dnode %08x, pointing to %08x, should be %08lx",
553 dno, up,
554 (unsigned long)i->i_ino);
555 return;
556 }
557 if ((d1 = hpfs_map_dnode(i->i_sb, down, &qbh1))) {
558 d1->up = cpu_to_le32(up);
559 d1->root_dnode = 1;
560 hpfs_mark_4buffers_dirty(&qbh1);
561 hpfs_brelse4(&qbh1);
562 }
563 if ((fnode = hpfs_map_fnode(i->i_sb, up, &bh))) {
564 fnode->u.external[0].disk_secno = cpu_to_le32(down);
565 mark_buffer_dirty(bh);
566 brelse(bh);
567 }
568 hpfs_inode->i_dno = down;
569 for_all_poss(i, hpfs_pos_subst, ((loff_t)dno << 4) | 1, (loff_t) 12);
570 return;
571 }
572 if (!(dnode = hpfs_map_dnode(i->i_sb, up, &qbh))) return;
573 p = 1;
574 de_end = dnode_end_de(dnode);
575 for (de = dnode_first_de(dnode); de < de_end; de = de_next_de(de), p++)
576 if (de->down) if (de_down_pointer(de) == dno) goto fnd;
577 hpfs_error(i->i_sb, "delete_empty_dnode: pointer to dnode %08x not found in dnode %08x", dno, up);
578 goto end;
579 fnd:
580 for_all_poss(i, hpfs_pos_subst, ((loff_t)dno << 4) | 1, ((loff_t)up << 4) | p);
581 if (!down) {
582 de->down = 0;
583 le16_add_cpu(&de->length, -4);
584 le32_add_cpu(&dnode->first_free, -4);
585 memmove(de_next_de(de), (char *)de_next_de(de) + 4,
586 (char *)dnode + le32_to_cpu(dnode->first_free) - (char *)de_next_de(de));
587 } else {
588 struct dnode *d1;
589 struct quad_buffer_head qbh1;
590 *(dnode_secno *) ((void *) de + le16_to_cpu(de->length) - 4) = down;
591 if ((d1 = hpfs_map_dnode(i->i_sb, down, &qbh1))) {
592 d1->up = cpu_to_le32(up);
593 hpfs_mark_4buffers_dirty(&qbh1);
594 hpfs_brelse4(&qbh1);
595 }
596 }
597 } else {
598 hpfs_error(i->i_sb, "delete_empty_dnode: dnode %08x, first_free == %03x", dno, le32_to_cpu(dnode->first_free));
599 goto end;
600 }
601
602 if (!de->last) {
603 struct hpfs_dirent *de_next = de_next_de(de);
604 struct hpfs_dirent *de_cp;
605 struct dnode *d1;
606 struct quad_buffer_head qbh1;
607 if (!de_next->down) goto endm;
608 ndown = de_down_pointer(de_next);
609 if (!(de_cp = kmalloc(le16_to_cpu(de->length), GFP_NOFS))) {
610 pr_err("out of memory for dtree balancing\n");
611 goto endm;
612 }
613 memcpy(de_cp, de, le16_to_cpu(de->length));
614 hpfs_delete_de(i->i_sb, dnode, de);
615 hpfs_mark_4buffers_dirty(&qbh);
616 hpfs_brelse4(&qbh);
617 for_all_poss(i, hpfs_pos_subst, ((loff_t)up << 4) | p, 4);
618 for_all_poss(i, hpfs_pos_del, ((loff_t)up << 4) | p, 1);
619 if (de_cp->down) if ((d1 = hpfs_map_dnode(i->i_sb, de_down_pointer(de_cp), &qbh1))) {
620 d1->up = cpu_to_le32(ndown);
621 hpfs_mark_4buffers_dirty(&qbh1);
622 hpfs_brelse4(&qbh1);
623 }
624 hpfs_add_to_dnode(i, ndown, de_cp->name, de_cp->namelen, de_cp, de_cp->down ? de_down_pointer(de_cp) : 0);
625 /*pr_info("UP-TO-DNODE: %08x (ndown = %08x, down = %08x, dno = %08x)\n",
626 up, ndown, down, dno);*/
627 dno = up;
628 kfree(de_cp);
629 goto try_it_again;
630 } else {
631 struct hpfs_dirent *de_prev = dnode_pre_last_de(dnode);
632 struct hpfs_dirent *de_cp;
633 struct dnode *d1;
634 struct quad_buffer_head qbh1;
635 dnode_secno dlp;
636 if (!de_prev) {
637 hpfs_error(i->i_sb, "delete_empty_dnode: empty dnode %08x", up);
638 hpfs_mark_4buffers_dirty(&qbh);
639 hpfs_brelse4(&qbh);
640 dno = up;
641 goto try_it_again;
642 }
643 if (!de_prev->down) goto endm;
644 ndown = de_down_pointer(de_prev);
645 if ((d1 = hpfs_map_dnode(i->i_sb, ndown, &qbh1))) {
646 struct hpfs_dirent *del = dnode_last_de(d1);
647 dlp = del->down ? de_down_pointer(del) : 0;
648 if (!dlp && down) {
649 if (le32_to_cpu(d1->first_free) > 2044) {
650 if (hpfs_sb(i->i_sb)->sb_chk >= 2) {
651 pr_err("unbalanced dnode tree, see hpfs.txt 4 more info\n");
652 pr_err("terminating balancing operation\n");
653 }
654 hpfs_brelse4(&qbh1);
655 goto endm;
656 }
657 if (hpfs_sb(i->i_sb)->sb_chk >= 2) {
658 pr_err("unbalanced dnode tree, see hpfs.txt 4 more info\n");
659 pr_err("goin'on\n");
660 }
661 le16_add_cpu(&del->length, 4);
662 del->down = 1;
663 le32_add_cpu(&d1->first_free, 4);
664 }
665 if (dlp && !down) {
666 le16_add_cpu(&del->length, -4);
667 del->down = 0;
668 le32_add_cpu(&d1->first_free, -4);
669 } else if (down)
670 *(__le32 *) ((void *) del + le16_to_cpu(del->length) - 4) = cpu_to_le32(down);
671 } else goto endm;
672 if (!(de_cp = kmalloc(le16_to_cpu(de_prev->length), GFP_NOFS))) {
673 pr_err("out of memory for dtree balancing\n");
674 hpfs_brelse4(&qbh1);
675 goto endm;
676 }
677 hpfs_mark_4buffers_dirty(&qbh1);
678 hpfs_brelse4(&qbh1);
679 memcpy(de_cp, de_prev, le16_to_cpu(de_prev->length));
680 hpfs_delete_de(i->i_sb, dnode, de_prev);
681 if (!de_prev->down) {
682 le16_add_cpu(&de_prev->length, 4);
683 de_prev->down = 1;
684 le32_add_cpu(&dnode->first_free, 4);
685 }
686 *(__le32 *) ((void *) de_prev + le16_to_cpu(de_prev->length) - 4) = cpu_to_le32(ndown);
687 hpfs_mark_4buffers_dirty(&qbh);
688 hpfs_brelse4(&qbh);
689 for_all_poss(i, hpfs_pos_subst, ((loff_t)up << 4) | (p - 1), 4);
690 for_all_poss(i, hpfs_pos_subst, ((loff_t)up << 4) | p, ((loff_t)up << 4) | (p - 1));
691 if (down) if ((d1 = hpfs_map_dnode(i->i_sb, de_down_pointer(de), &qbh1))) {
692 d1->up = cpu_to_le32(ndown);
693 hpfs_mark_4buffers_dirty(&qbh1);
694 hpfs_brelse4(&qbh1);
695 }
696 hpfs_add_to_dnode(i, ndown, de_cp->name, de_cp->namelen, de_cp, dlp);
697 dno = up;
698 kfree(de_cp);
699 goto try_it_again;
700 }
701 endm:
702 hpfs_mark_4buffers_dirty(&qbh);
703 end:
704 hpfs_brelse4(&qbh);
705}
706
707
708/* Delete dirent from directory */
709
710int hpfs_remove_dirent(struct inode *i, dnode_secno dno, struct hpfs_dirent *de,
711 struct quad_buffer_head *qbh, int depth)
712{
713 struct dnode *dnode = qbh->data;
714 dnode_secno down = 0;
715 loff_t t;
716 if (de->first || de->last) {
717 hpfs_error(i->i_sb, "hpfs_remove_dirent: attempt to delete first or last dirent in dnode %08x", dno);
718 hpfs_brelse4(qbh);
719 return 1;
720 }
721 if (de->down) down = de_down_pointer(de);
722 if (depth && (de->down || (de == dnode_first_de(dnode) && de_next_de(de)->last))) {
723 if (hpfs_check_free_dnodes(i->i_sb, FREE_DNODES_DEL)) {
724 hpfs_brelse4(qbh);
725 return 2;
726 }
727 }
728 for_all_poss(i, hpfs_pos_del, (t = get_pos(dnode, de)) + 1, 1);
729 hpfs_delete_de(i->i_sb, dnode, de);
730 hpfs_mark_4buffers_dirty(qbh);
731 hpfs_brelse4(qbh);
732 if (down) {
733 dnode_secno a = move_to_top(i, down, dno);
734 for_all_poss(i, hpfs_pos_subst, 5, t);
735 if (a) delete_empty_dnode(i, a);
736 return !a;
737 }
738 delete_empty_dnode(i, dno);
739 return 0;
740}
741
742void hpfs_count_dnodes(struct super_block *s, dnode_secno dno, int *n_dnodes,
743 int *n_subdirs, int *n_items)
744{
745 struct dnode *dnode;
746 struct quad_buffer_head qbh;
747 struct hpfs_dirent *de;
748 dnode_secno ptr, odno = 0;
749 int c1, c2 = 0;
750 int d1, d2 = 0;
751 go_down:
752 if (n_dnodes) (*n_dnodes)++;
753 if (hpfs_sb(s)->sb_chk)
754 if (hpfs_stop_cycles(s, dno, &c1, &c2, "hpfs_count_dnodes #1")) return;
755 ptr = 0;
756 go_up:
757 if (!(dnode = hpfs_map_dnode(s, dno, &qbh))) return;
758 if (hpfs_sb(s)->sb_chk) if (odno && odno != -1 && le32_to_cpu(dnode->up) != odno)
759 hpfs_error(s, "hpfs_count_dnodes: bad up pointer; dnode %08x, down %08x points to %08x", odno, dno, le32_to_cpu(dnode->up));
760 de = dnode_first_de(dnode);
761 if (ptr) while(1) {
762 if (de->down) if (de_down_pointer(de) == ptr) goto process_de;
763 if (de->last) {
764 hpfs_brelse4(&qbh);
765 hpfs_error(s, "hpfs_count_dnodes: pointer to dnode %08x not found in dnode %08x, got here from %08x",
766 ptr, dno, odno);
767 return;
768 }
769 de = de_next_de(de);
770 }
771 next_de:
772 if (de->down) {
773 odno = dno;
774 dno = de_down_pointer(de);
775 hpfs_brelse4(&qbh);
776 goto go_down;
777 }
778 process_de:
779 if (!de->first && !de->last && de->directory && n_subdirs) (*n_subdirs)++;
780 if (!de->first && !de->last && n_items) (*n_items)++;
781 if ((de = de_next_de(de)) < dnode_end_de(dnode)) goto next_de;
782 ptr = dno;
783 dno = le32_to_cpu(dnode->up);
784 if (dnode->root_dnode) {
785 hpfs_brelse4(&qbh);
786 return;
787 }
788 hpfs_brelse4(&qbh);
789 if (hpfs_sb(s)->sb_chk)
790 if (hpfs_stop_cycles(s, ptr, &d1, &d2, "hpfs_count_dnodes #2")) return;
791 odno = -1;
792 goto go_up;
793}
794
795static struct hpfs_dirent *map_nth_dirent(struct super_block *s, dnode_secno dno, int n,
796 struct quad_buffer_head *qbh, struct dnode **dn)
797{
798 int i;
799 struct hpfs_dirent *de, *de_end;
800 struct dnode *dnode;
801 dnode = hpfs_map_dnode(s, dno, qbh);
802 if (!dnode) return NULL;
803 if (dn) *dn=dnode;
804 de = dnode_first_de(dnode);
805 de_end = dnode_end_de(dnode);
806 for (i = 1; de < de_end; i++, de = de_next_de(de)) {
807 if (i == n) {
808 return de;
809 }
810 if (de->last) break;
811 }
812 hpfs_brelse4(qbh);
813 hpfs_error(s, "map_nth_dirent: n too high; dnode = %08x, requested %08x", dno, n);
814 return NULL;
815}
816
817dnode_secno hpfs_de_as_down_as_possible(struct super_block *s, dnode_secno dno)
818{
819 struct quad_buffer_head qbh;
820 dnode_secno d = dno;
821 dnode_secno up = 0;
822 struct hpfs_dirent *de;
823 int c1, c2 = 0;
824
825 again:
826 if (hpfs_sb(s)->sb_chk)
827 if (hpfs_stop_cycles(s, d, &c1, &c2, "hpfs_de_as_down_as_possible"))
828 return d;
829 if (!(de = map_nth_dirent(s, d, 1, &qbh, NULL))) return dno;
830 if (hpfs_sb(s)->sb_chk)
831 if (up && le32_to_cpu(((struct dnode *)qbh.data)->up) != up)
832 hpfs_error(s, "hpfs_de_as_down_as_possible: bad up pointer; dnode %08x, down %08x points to %08x", up, d, le32_to_cpu(((struct dnode *)qbh.data)->up));
833 if (!de->down) {
834 hpfs_brelse4(&qbh);
835 return d;
836 }
837 up = d;
838 d = de_down_pointer(de);
839 hpfs_brelse4(&qbh);
840 goto again;
841}
842
843struct hpfs_dirent *map_pos_dirent(struct inode *inode, loff_t *posp,
844 struct quad_buffer_head *qbh)
845{
846 loff_t pos;
847 unsigned c;
848 dnode_secno dno;
849 struct hpfs_dirent *de, *d;
850 struct hpfs_dirent *up_de;
851 struct hpfs_dirent *end_up_de;
852 struct dnode *dnode;
853 struct dnode *up_dnode;
854 struct quad_buffer_head qbh0;
855
856 pos = *posp;
857 dno = pos >> 6 << 2;
858 pos &= 077;
859 if (!(de = map_nth_dirent(inode->i_sb, dno, pos, qbh, &dnode)))
860 goto bail;
861
862 /* Going to the next dirent */
863 if ((d = de_next_de(de)) < dnode_end_de(dnode)) {
864 if (!(++*posp & 077)) {
865 hpfs_error(inode->i_sb,
866 "map_pos_dirent: pos crossed dnode boundary; pos = %08llx",
867 (unsigned long long)*posp);
868 goto bail;
869 }
870 /* We're going down the tree */
871 if (d->down) {
872 *posp = ((loff_t) hpfs_de_as_down_as_possible(inode->i_sb, de_down_pointer(d)) << 4) + 1;
873 }
874
875 return de;
876 }
877
878 /* Going up */
879 if (dnode->root_dnode) goto bail;
880
881 if (!(up_dnode = hpfs_map_dnode(inode->i_sb, le32_to_cpu(dnode->up), &qbh0)))
882 goto bail;
883
884 end_up_de = dnode_end_de(up_dnode);
885 c = 0;
886 for (up_de = dnode_first_de(up_dnode); up_de < end_up_de;
887 up_de = de_next_de(up_de)) {
888 if (!(++c & 077)) hpfs_error(inode->i_sb,
889 "map_pos_dirent: pos crossed dnode boundary; dnode = %08x", le32_to_cpu(dnode->up));
890 if (up_de->down && de_down_pointer(up_de) == dno) {
891 *posp = ((loff_t) le32_to_cpu(dnode->up) << 4) + c;
892 hpfs_brelse4(&qbh0);
893 return de;
894 }
895 }
896
897 hpfs_error(inode->i_sb, "map_pos_dirent: pointer to dnode %08x not found in parent dnode %08x",
898 dno, le32_to_cpu(dnode->up));
899 hpfs_brelse4(&qbh0);
900
901 bail:
902 *posp = 12;
903 return de;
904}
905
906/* Find a dirent in tree */
907
908struct hpfs_dirent *map_dirent(struct inode *inode, dnode_secno dno,
909 const unsigned char *name, unsigned len,
910 dnode_secno *dd, struct quad_buffer_head *qbh)
911{
912 struct dnode *dnode;
913 struct hpfs_dirent *de;
914 struct hpfs_dirent *de_end;
915 int c1, c2 = 0;
916
917 if (!S_ISDIR(inode->i_mode)) hpfs_error(inode->i_sb, "map_dirent: not a directory\n");
918 again:
919 if (hpfs_sb(inode->i_sb)->sb_chk)
920 if (hpfs_stop_cycles(inode->i_sb, dno, &c1, &c2, "map_dirent")) return NULL;
921 if (!(dnode = hpfs_map_dnode(inode->i_sb, dno, qbh))) return NULL;
922
923 de_end = dnode_end_de(dnode);
924 for (de = dnode_first_de(dnode); de < de_end; de = de_next_de(de)) {
925 int t = hpfs_compare_names(inode->i_sb, name, len, de->name, de->namelen, de->last);
926 if (!t) {
927 if (dd) *dd = dno;
928 return de;
929 }
930 if (t < 0) {
931 if (de->down) {
932 dno = de_down_pointer(de);
933 hpfs_brelse4(qbh);
934 goto again;
935 }
936 break;
937 }
938 }
939 hpfs_brelse4(qbh);
940 return NULL;
941}
942
943/*
944 * Remove empty directory. In normal cases it is only one dnode with two
945 * entries, but we must handle also such obscure cases when it's a tree
946 * of empty dnodes.
947 */
948
949void hpfs_remove_dtree(struct super_block *s, dnode_secno dno)
950{
951 struct quad_buffer_head qbh;
952 struct dnode *dnode;
953 struct hpfs_dirent *de;
954 dnode_secno d1, d2, rdno = dno;
955 while (1) {
956 if (!(dnode = hpfs_map_dnode(s, dno, &qbh))) return;
957 de = dnode_first_de(dnode);
958 if (de->last) {
959 if (de->down) d1 = de_down_pointer(de);
960 else goto error;
961 hpfs_brelse4(&qbh);
962 hpfs_free_dnode(s, dno);
963 dno = d1;
964 } else break;
965 }
966 if (!de->first) goto error;
967 d1 = de->down ? de_down_pointer(de) : 0;
968 de = de_next_de(de);
969 if (!de->last) goto error;
970 d2 = de->down ? de_down_pointer(de) : 0;
971 hpfs_brelse4(&qbh);
972 hpfs_free_dnode(s, dno);
973 do {
974 while (d1) {
975 if (!(dnode = hpfs_map_dnode(s, dno = d1, &qbh))) return;
976 de = dnode_first_de(dnode);
977 if (!de->last) goto error;
978 d1 = de->down ? de_down_pointer(de) : 0;
979 hpfs_brelse4(&qbh);
980 hpfs_free_dnode(s, dno);
981 }
982 d1 = d2;
983 d2 = 0;
984 } while (d1);
985 return;
986 error:
987 hpfs_brelse4(&qbh);
988 hpfs_free_dnode(s, dno);
989 hpfs_error(s, "directory %08x is corrupted or not empty", rdno);
990}
991
992/*
993 * Find dirent for specified fnode. Use truncated 15-char name in fnode as
994 * a help for searching.
995 */
996
997struct hpfs_dirent *map_fnode_dirent(struct super_block *s, fnode_secno fno,
998 struct fnode *f, struct quad_buffer_head *qbh)
999{
1000 unsigned char *name1;
1001 unsigned char *name2;
1002 int name1len, name2len;
1003 struct dnode *d;
1004 dnode_secno dno, downd;
1005 struct fnode *upf;
1006 struct buffer_head *bh;
1007 struct hpfs_dirent *de, *de_end;
1008 int c;
1009 int c1, c2 = 0;
1010 int d1, d2 = 0;
1011 name1 = f->name;
1012 if (!(name2 = kmalloc(256, GFP_NOFS))) {
1013 pr_err("out of memory, can't map dirent\n");
1014 return NULL;
1015 }
1016 if (f->len <= 15)
1017 memcpy(name2, name1, name1len = name2len = f->len);
1018 else {
1019 memcpy(name2, name1, 15);
1020 memset(name2 + 15, 0xff, 256 - 15);
1021 /*name2[15] = 0xff;*/
1022 name1len = 15; name2len = 256;
1023 }
1024 if (!(upf = hpfs_map_fnode(s, le32_to_cpu(f->up), &bh))) {
1025 kfree(name2);
1026 return NULL;
1027 }
1028 if (!fnode_is_dir(upf)) {
1029 brelse(bh);
1030 hpfs_error(s, "fnode %08x has non-directory parent %08x", fno, le32_to_cpu(f->up));
1031 kfree(name2);
1032 return NULL;
1033 }
1034 dno = le32_to_cpu(upf->u.external[0].disk_secno);
1035 brelse(bh);
1036 go_down:
1037 downd = 0;
1038 go_up:
1039 if (!(d = hpfs_map_dnode(s, dno, qbh))) {
1040 kfree(name2);
1041 return NULL;
1042 }
1043 de_end = dnode_end_de(d);
1044 de = dnode_first_de(d);
1045 if (downd) {
1046 while (de < de_end) {
1047 if (de->down) if (de_down_pointer(de) == downd) goto f;
1048 de = de_next_de(de);
1049 }
1050 hpfs_error(s, "pointer to dnode %08x not found in dnode %08x", downd, dno);
1051 hpfs_brelse4(qbh);
1052 kfree(name2);
1053 return NULL;
1054 }
1055 next_de:
1056 if (le32_to_cpu(de->fnode) == fno) {
1057 kfree(name2);
1058 return de;
1059 }
1060 c = hpfs_compare_names(s, name1, name1len, de->name, de->namelen, de->last);
1061 if (c < 0 && de->down) {
1062 dno = de_down_pointer(de);
1063 hpfs_brelse4(qbh);
1064 if (hpfs_sb(s)->sb_chk)
1065 if (hpfs_stop_cycles(s, dno, &c1, &c2, "map_fnode_dirent #1")) {
1066 kfree(name2);
1067 return NULL;
1068 }
1069 goto go_down;
1070 }
1071 f:
1072 if (le32_to_cpu(de->fnode) == fno) {
1073 kfree(name2);
1074 return de;
1075 }
1076 c = hpfs_compare_names(s, name2, name2len, de->name, de->namelen, de->last);
1077 if (c < 0 && !de->last) goto not_found;
1078 if ((de = de_next_de(de)) < de_end) goto next_de;
1079 if (d->root_dnode) goto not_found;
1080 downd = dno;
1081 dno = le32_to_cpu(d->up);
1082 hpfs_brelse4(qbh);
1083 if (hpfs_sb(s)->sb_chk)
1084 if (hpfs_stop_cycles(s, downd, &d1, &d2, "map_fnode_dirent #2")) {
1085 kfree(name2);
1086 return NULL;
1087 }
1088 goto go_up;
1089 not_found:
1090 hpfs_brelse4(qbh);
1091 hpfs_error(s, "dirent for fnode %08x not found", fno);
1092 kfree(name2);
1093 return NULL;
1094}
1/*
2 * linux/fs/hpfs/dnode.c
3 *
4 * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
5 *
6 * handling directory dnode tree - adding, deleteing & searching for dirents
7 */
8
9#include "hpfs_fn.h"
10
11static loff_t get_pos(struct dnode *d, struct hpfs_dirent *fde)
12{
13 struct hpfs_dirent *de;
14 struct hpfs_dirent *de_end = dnode_end_de(d);
15 int i = 1;
16 for (de = dnode_first_de(d); de < de_end; de = de_next_de(de)) {
17 if (de == fde) return ((loff_t) le32_to_cpu(d->self) << 4) | (loff_t)i;
18 i++;
19 }
20 printk("HPFS: get_pos: not_found\n");
21 return ((loff_t)le32_to_cpu(d->self) << 4) | (loff_t)1;
22}
23
24void hpfs_add_pos(struct inode *inode, loff_t *pos)
25{
26 struct hpfs_inode_info *hpfs_inode = hpfs_i(inode);
27 int i = 0;
28 loff_t **ppos;
29
30 if (hpfs_inode->i_rddir_off)
31 for (; hpfs_inode->i_rddir_off[i]; i++)
32 if (hpfs_inode->i_rddir_off[i] == pos) return;
33 if (!(i&0x0f)) {
34 if (!(ppos = kmalloc((i+0x11) * sizeof(loff_t*), GFP_NOFS))) {
35 printk("HPFS: out of memory for position list\n");
36 return;
37 }
38 if (hpfs_inode->i_rddir_off) {
39 memcpy(ppos, hpfs_inode->i_rddir_off, i * sizeof(loff_t));
40 kfree(hpfs_inode->i_rddir_off);
41 }
42 hpfs_inode->i_rddir_off = ppos;
43 }
44 hpfs_inode->i_rddir_off[i] = pos;
45 hpfs_inode->i_rddir_off[i + 1] = NULL;
46}
47
48void hpfs_del_pos(struct inode *inode, loff_t *pos)
49{
50 struct hpfs_inode_info *hpfs_inode = hpfs_i(inode);
51 loff_t **i, **j;
52
53 if (!hpfs_inode->i_rddir_off) goto not_f;
54 for (i = hpfs_inode->i_rddir_off; *i; i++) if (*i == pos) goto fnd;
55 goto not_f;
56 fnd:
57 for (j = i + 1; *j; j++) ;
58 *i = *(j - 1);
59 *(j - 1) = NULL;
60 if (j - 1 == hpfs_inode->i_rddir_off) {
61 kfree(hpfs_inode->i_rddir_off);
62 hpfs_inode->i_rddir_off = NULL;
63 }
64 return;
65 not_f:
66 /*printk("HPFS: warning: position pointer %p->%08x not found\n", pos, (int)*pos);*/
67 return;
68}
69
70static void for_all_poss(struct inode *inode, void (*f)(loff_t *, loff_t, loff_t),
71 loff_t p1, loff_t p2)
72{
73 struct hpfs_inode_info *hpfs_inode = hpfs_i(inode);
74 loff_t **i;
75
76 if (!hpfs_inode->i_rddir_off) return;
77 for (i = hpfs_inode->i_rddir_off; *i; i++) (*f)(*i, p1, p2);
78 return;
79}
80
81static void hpfs_pos_subst(loff_t *p, loff_t f, loff_t t)
82{
83 if (*p == f) *p = t;
84}
85
86/*void hpfs_hpfs_pos_substd(loff_t *p, loff_t f, loff_t t)
87{
88 if ((*p & ~0x3f) == (f & ~0x3f)) *p = (t & ~0x3f) | (*p & 0x3f);
89}*/
90
91static void hpfs_pos_ins(loff_t *p, loff_t d, loff_t c)
92{
93 if ((*p & ~0x3f) == (d & ~0x3f) && (*p & 0x3f) >= (d & 0x3f)) {
94 int n = (*p & 0x3f) + c;
95 if (n > 0x3f) printk("HPFS: hpfs_pos_ins: %08x + %d\n", (int)*p, (int)c >> 8);
96 else *p = (*p & ~0x3f) | n;
97 }
98}
99
100static void hpfs_pos_del(loff_t *p, loff_t d, loff_t c)
101{
102 if ((*p & ~0x3f) == (d & ~0x3f) && (*p & 0x3f) >= (d & 0x3f)) {
103 int n = (*p & 0x3f) - c;
104 if (n < 1) printk("HPFS: hpfs_pos_ins: %08x - %d\n", (int)*p, (int)c >> 8);
105 else *p = (*p & ~0x3f) | n;
106 }
107}
108
109static struct hpfs_dirent *dnode_pre_last_de(struct dnode *d)
110{
111 struct hpfs_dirent *de, *de_end, *dee = NULL, *deee = NULL;
112 de_end = dnode_end_de(d);
113 for (de = dnode_first_de(d); de < de_end; de = de_next_de(de)) {
114 deee = dee; dee = de;
115 }
116 return deee;
117}
118
119static struct hpfs_dirent *dnode_last_de(struct dnode *d)
120{
121 struct hpfs_dirent *de, *de_end, *dee = NULL;
122 de_end = dnode_end_de(d);
123 for (de = dnode_first_de(d); de < de_end; de = de_next_de(de)) {
124 dee = de;
125 }
126 return dee;
127}
128
129static void set_last_pointer(struct super_block *s, struct dnode *d, dnode_secno ptr)
130{
131 struct hpfs_dirent *de;
132 if (!(de = dnode_last_de(d))) {
133 hpfs_error(s, "set_last_pointer: empty dnode %08x", le32_to_cpu(d->self));
134 return;
135 }
136 if (hpfs_sb(s)->sb_chk) {
137 if (de->down) {
138 hpfs_error(s, "set_last_pointer: dnode %08x has already last pointer %08x",
139 le32_to_cpu(d->self), de_down_pointer(de));
140 return;
141 }
142 if (le16_to_cpu(de->length) != 32) {
143 hpfs_error(s, "set_last_pointer: bad last dirent in dnode %08x", le32_to_cpu(d->self));
144 return;
145 }
146 }
147 if (ptr) {
148 d->first_free = cpu_to_le32(le32_to_cpu(d->first_free) + 4);
149 if (le32_to_cpu(d->first_free) > 2048) {
150 hpfs_error(s, "set_last_pointer: too long dnode %08x", le32_to_cpu(d->self));
151 d->first_free = cpu_to_le32(le32_to_cpu(d->first_free) - 4);
152 return;
153 }
154 de->length = cpu_to_le16(36);
155 de->down = 1;
156 *(__le32 *)((char *)de + 32) = cpu_to_le32(ptr);
157 }
158}
159
160/* Add an entry to dnode and don't care if it grows over 2048 bytes */
161
162struct hpfs_dirent *hpfs_add_de(struct super_block *s, struct dnode *d,
163 const unsigned char *name,
164 unsigned namelen, secno down_ptr)
165{
166 struct hpfs_dirent *de;
167 struct hpfs_dirent *de_end = dnode_end_de(d);
168 unsigned d_size = de_size(namelen, down_ptr);
169 for (de = dnode_first_de(d); de < de_end; de = de_next_de(de)) {
170 int c = hpfs_compare_names(s, name, namelen, de->name, de->namelen, de->last);
171 if (!c) {
172 hpfs_error(s, "name (%c,%d) already exists in dnode %08x", *name, namelen, le32_to_cpu(d->self));
173 return NULL;
174 }
175 if (c < 0) break;
176 }
177 memmove((char *)de + d_size, de, (char *)de_end - (char *)de);
178 memset(de, 0, d_size);
179 if (down_ptr) {
180 *(__le32 *)((char *)de + d_size - 4) = cpu_to_le32(down_ptr);
181 de->down = 1;
182 }
183 de->length = cpu_to_le16(d_size);
184 de->not_8x3 = hpfs_is_name_long(name, namelen);
185 de->namelen = namelen;
186 memcpy(de->name, name, namelen);
187 d->first_free = cpu_to_le32(le32_to_cpu(d->first_free) + d_size);
188 return de;
189}
190
191/* Delete dirent and don't care about its subtree */
192
193static void hpfs_delete_de(struct super_block *s, struct dnode *d,
194 struct hpfs_dirent *de)
195{
196 if (de->last) {
197 hpfs_error(s, "attempt to delete last dirent in dnode %08x", le32_to_cpu(d->self));
198 return;
199 }
200 d->first_free = cpu_to_le32(le32_to_cpu(d->first_free) - le16_to_cpu(de->length));
201 memmove(de, de_next_de(de), le32_to_cpu(d->first_free) + (char *)d - (char *)de);
202}
203
204static void fix_up_ptrs(struct super_block *s, struct dnode *d)
205{
206 struct hpfs_dirent *de;
207 struct hpfs_dirent *de_end = dnode_end_de(d);
208 dnode_secno dno = le32_to_cpu(d->self);
209 for (de = dnode_first_de(d); de < de_end; de = de_next_de(de))
210 if (de->down) {
211 struct quad_buffer_head qbh;
212 struct dnode *dd;
213 if ((dd = hpfs_map_dnode(s, de_down_pointer(de), &qbh))) {
214 if (le32_to_cpu(dd->up) != dno || dd->root_dnode) {
215 dd->up = cpu_to_le32(dno);
216 dd->root_dnode = 0;
217 hpfs_mark_4buffers_dirty(&qbh);
218 }
219 hpfs_brelse4(&qbh);
220 }
221 }
222}
223
224/* Add an entry to dnode and do dnode splitting if required */
225
226static int hpfs_add_to_dnode(struct inode *i, dnode_secno dno,
227 const unsigned char *name, unsigned namelen,
228 struct hpfs_dirent *new_de, dnode_secno down_ptr)
229{
230 struct quad_buffer_head qbh, qbh1, qbh2;
231 struct dnode *d, *ad, *rd, *nd = NULL;
232 dnode_secno adno, rdno;
233 struct hpfs_dirent *de;
234 struct hpfs_dirent nde;
235 unsigned char *nname;
236 int h;
237 int pos;
238 struct buffer_head *bh;
239 struct fnode *fnode;
240 int c1, c2 = 0;
241 if (!(nname = kmalloc(256, GFP_NOFS))) {
242 printk("HPFS: out of memory, can't add to dnode\n");
243 return 1;
244 }
245 go_up:
246 if (namelen >= 256) {
247 hpfs_error(i->i_sb, "hpfs_add_to_dnode: namelen == %d", namelen);
248 kfree(nd);
249 kfree(nname);
250 return 1;
251 }
252 if (!(d = hpfs_map_dnode(i->i_sb, dno, &qbh))) {
253 kfree(nd);
254 kfree(nname);
255 return 1;
256 }
257 go_up_a:
258 if (hpfs_sb(i->i_sb)->sb_chk)
259 if (hpfs_stop_cycles(i->i_sb, dno, &c1, &c2, "hpfs_add_to_dnode")) {
260 hpfs_brelse4(&qbh);
261 kfree(nd);
262 kfree(nname);
263 return 1;
264 }
265 if (le32_to_cpu(d->first_free) + de_size(namelen, down_ptr) <= 2048) {
266 loff_t t;
267 copy_de(de=hpfs_add_de(i->i_sb, d, name, namelen, down_ptr), new_de);
268 t = get_pos(d, de);
269 for_all_poss(i, hpfs_pos_ins, t, 1);
270 for_all_poss(i, hpfs_pos_subst, 4, t);
271 for_all_poss(i, hpfs_pos_subst, 5, t + 1);
272 hpfs_mark_4buffers_dirty(&qbh);
273 hpfs_brelse4(&qbh);
274 kfree(nd);
275 kfree(nname);
276 return 0;
277 }
278 if (!nd) if (!(nd = kmalloc(0x924, GFP_NOFS))) {
279 /* 0x924 is a max size of dnode after adding a dirent with
280 max name length. We alloc this only once. There must
281 not be any error while splitting dnodes, otherwise the
282 whole directory, not only file we're adding, would
283 be lost. */
284 printk("HPFS: out of memory for dnode splitting\n");
285 hpfs_brelse4(&qbh);
286 kfree(nname);
287 return 1;
288 }
289 memcpy(nd, d, le32_to_cpu(d->first_free));
290 copy_de(de = hpfs_add_de(i->i_sb, nd, name, namelen, down_ptr), new_de);
291 for_all_poss(i, hpfs_pos_ins, get_pos(nd, de), 1);
292 h = ((char *)dnode_last_de(nd) - (char *)nd) / 2 + 10;
293 if (!(ad = hpfs_alloc_dnode(i->i_sb, le32_to_cpu(d->up), &adno, &qbh1))) {
294 hpfs_error(i->i_sb, "unable to alloc dnode - dnode tree will be corrupted");
295 hpfs_brelse4(&qbh);
296 kfree(nd);
297 kfree(nname);
298 return 1;
299 }
300 i->i_size += 2048;
301 i->i_blocks += 4;
302 pos = 1;
303 for (de = dnode_first_de(nd); (char *)de_next_de(de) - (char *)nd < h; de = de_next_de(de)) {
304 copy_de(hpfs_add_de(i->i_sb, ad, de->name, de->namelen, de->down ? de_down_pointer(de) : 0), de);
305 for_all_poss(i, hpfs_pos_subst, ((loff_t)dno << 4) | pos, ((loff_t)adno << 4) | pos);
306 pos++;
307 }
308 copy_de(new_de = &nde, de);
309 memcpy(nname, de->name, de->namelen);
310 name = nname;
311 namelen = de->namelen;
312 for_all_poss(i, hpfs_pos_subst, ((loff_t)dno << 4) | pos, 4);
313 down_ptr = adno;
314 set_last_pointer(i->i_sb, ad, de->down ? de_down_pointer(de) : 0);
315 de = de_next_de(de);
316 memmove((char *)nd + 20, de, le32_to_cpu(nd->first_free) + (char *)nd - (char *)de);
317 nd->first_free = cpu_to_le32(le32_to_cpu(nd->first_free) - ((char *)de - (char *)nd - 20));
318 memcpy(d, nd, le32_to_cpu(nd->first_free));
319 for_all_poss(i, hpfs_pos_del, (loff_t)dno << 4, pos);
320 fix_up_ptrs(i->i_sb, ad);
321 if (!d->root_dnode) {
322 ad->up = d->up;
323 dno = le32_to_cpu(ad->up);
324 hpfs_mark_4buffers_dirty(&qbh);
325 hpfs_brelse4(&qbh);
326 hpfs_mark_4buffers_dirty(&qbh1);
327 hpfs_brelse4(&qbh1);
328 goto go_up;
329 }
330 if (!(rd = hpfs_alloc_dnode(i->i_sb, le32_to_cpu(d->up), &rdno, &qbh2))) {
331 hpfs_error(i->i_sb, "unable to alloc dnode - dnode tree will be corrupted");
332 hpfs_brelse4(&qbh);
333 hpfs_brelse4(&qbh1);
334 kfree(nd);
335 kfree(nname);
336 return 1;
337 }
338 i->i_size += 2048;
339 i->i_blocks += 4;
340 rd->root_dnode = 1;
341 rd->up = d->up;
342 if (!(fnode = hpfs_map_fnode(i->i_sb, le32_to_cpu(d->up), &bh))) {
343 hpfs_free_dnode(i->i_sb, rdno);
344 hpfs_brelse4(&qbh);
345 hpfs_brelse4(&qbh1);
346 hpfs_brelse4(&qbh2);
347 kfree(nd);
348 kfree(nname);
349 return 1;
350 }
351 fnode->u.external[0].disk_secno = cpu_to_le32(rdno);
352 mark_buffer_dirty(bh);
353 brelse(bh);
354 hpfs_i(i)->i_dno = rdno;
355 d->up = ad->up = cpu_to_le32(rdno);
356 d->root_dnode = ad->root_dnode = 0;
357 hpfs_mark_4buffers_dirty(&qbh);
358 hpfs_brelse4(&qbh);
359 hpfs_mark_4buffers_dirty(&qbh1);
360 hpfs_brelse4(&qbh1);
361 qbh = qbh2;
362 set_last_pointer(i->i_sb, rd, dno);
363 dno = rdno;
364 d = rd;
365 goto go_up_a;
366}
367
368/*
369 * Add an entry to directory btree.
370 * I hate such crazy directory structure.
371 * It's easy to read but terrible to write.
372 * I wrote this directory code 4 times.
373 * I hope, now it's finally bug-free.
374 */
375
376int hpfs_add_dirent(struct inode *i,
377 const unsigned char *name, unsigned namelen,
378 struct hpfs_dirent *new_de)
379{
380 struct hpfs_inode_info *hpfs_inode = hpfs_i(i);
381 struct dnode *d;
382 struct hpfs_dirent *de, *de_end;
383 struct quad_buffer_head qbh;
384 dnode_secno dno;
385 int c;
386 int c1, c2 = 0;
387 dno = hpfs_inode->i_dno;
388 down:
389 if (hpfs_sb(i->i_sb)->sb_chk)
390 if (hpfs_stop_cycles(i->i_sb, dno, &c1, &c2, "hpfs_add_dirent")) return 1;
391 if (!(d = hpfs_map_dnode(i->i_sb, dno, &qbh))) return 1;
392 de_end = dnode_end_de(d);
393 for (de = dnode_first_de(d); de < de_end; de = de_next_de(de)) {
394 if (!(c = hpfs_compare_names(i->i_sb, name, namelen, de->name, de->namelen, de->last))) {
395 hpfs_brelse4(&qbh);
396 return -1;
397 }
398 if (c < 0) {
399 if (de->down) {
400 dno = de_down_pointer(de);
401 hpfs_brelse4(&qbh);
402 goto down;
403 }
404 break;
405 }
406 }
407 hpfs_brelse4(&qbh);
408 if (hpfs_check_free_dnodes(i->i_sb, FREE_DNODES_ADD)) {
409 c = 1;
410 goto ret;
411 }
412 i->i_version++;
413 c = hpfs_add_to_dnode(i, dno, name, namelen, new_de, 0);
414 ret:
415 return c;
416}
417
418/*
419 * Find dirent with higher name in 'from' subtree and move it to 'to' dnode.
420 * Return the dnode we moved from (to be checked later if it's empty)
421 */
422
423static secno move_to_top(struct inode *i, dnode_secno from, dnode_secno to)
424{
425 dnode_secno dno, ddno;
426 dnode_secno chk_up = to;
427 struct dnode *dnode;
428 struct quad_buffer_head qbh;
429 struct hpfs_dirent *de, *nde;
430 int a;
431 loff_t t;
432 int c1, c2 = 0;
433 dno = from;
434 while (1) {
435 if (hpfs_sb(i->i_sb)->sb_chk)
436 if (hpfs_stop_cycles(i->i_sb, dno, &c1, &c2, "move_to_top"))
437 return 0;
438 if (!(dnode = hpfs_map_dnode(i->i_sb, dno, &qbh))) return 0;
439 if (hpfs_sb(i->i_sb)->sb_chk) {
440 if (le32_to_cpu(dnode->up) != chk_up) {
441 hpfs_error(i->i_sb, "move_to_top: up pointer from %08x should be %08x, is %08x",
442 dno, chk_up, le32_to_cpu(dnode->up));
443 hpfs_brelse4(&qbh);
444 return 0;
445 }
446 chk_up = dno;
447 }
448 if (!(de = dnode_last_de(dnode))) {
449 hpfs_error(i->i_sb, "move_to_top: dnode %08x has no last de", dno);
450 hpfs_brelse4(&qbh);
451 return 0;
452 }
453 if (!de->down) break;
454 dno = de_down_pointer(de);
455 hpfs_brelse4(&qbh);
456 }
457 while (!(de = dnode_pre_last_de(dnode))) {
458 dnode_secno up = le32_to_cpu(dnode->up);
459 hpfs_brelse4(&qbh);
460 hpfs_free_dnode(i->i_sb, dno);
461 i->i_size -= 2048;
462 i->i_blocks -= 4;
463 for_all_poss(i, hpfs_pos_subst, ((loff_t)dno << 4) | 1, 5);
464 if (up == to) return to;
465 if (!(dnode = hpfs_map_dnode(i->i_sb, up, &qbh))) return 0;
466 if (dnode->root_dnode) {
467 hpfs_error(i->i_sb, "move_to_top: got to root_dnode while moving from %08x to %08x", from, to);
468 hpfs_brelse4(&qbh);
469 return 0;
470 }
471 de = dnode_last_de(dnode);
472 if (!de || !de->down) {
473 hpfs_error(i->i_sb, "move_to_top: dnode %08x doesn't point down to %08x", up, dno);
474 hpfs_brelse4(&qbh);
475 return 0;
476 }
477 dnode->first_free = cpu_to_le32(le32_to_cpu(dnode->first_free) - 4);
478 de->length = cpu_to_le16(le16_to_cpu(de->length) - 4);
479 de->down = 0;
480 hpfs_mark_4buffers_dirty(&qbh);
481 dno = up;
482 }
483 t = get_pos(dnode, de);
484 for_all_poss(i, hpfs_pos_subst, t, 4);
485 for_all_poss(i, hpfs_pos_subst, t + 1, 5);
486 if (!(nde = kmalloc(le16_to_cpu(de->length), GFP_NOFS))) {
487 hpfs_error(i->i_sb, "out of memory for dirent - directory will be corrupted");
488 hpfs_brelse4(&qbh);
489 return 0;
490 }
491 memcpy(nde, de, le16_to_cpu(de->length));
492 ddno = de->down ? de_down_pointer(de) : 0;
493 hpfs_delete_de(i->i_sb, dnode, de);
494 set_last_pointer(i->i_sb, dnode, ddno);
495 hpfs_mark_4buffers_dirty(&qbh);
496 hpfs_brelse4(&qbh);
497 a = hpfs_add_to_dnode(i, to, nde->name, nde->namelen, nde, from);
498 kfree(nde);
499 if (a) return 0;
500 return dno;
501}
502
503/*
504 * Check if a dnode is empty and delete it from the tree
505 * (chkdsk doesn't like empty dnodes)
506 */
507
508static void delete_empty_dnode(struct inode *i, dnode_secno dno)
509{
510 struct hpfs_inode_info *hpfs_inode = hpfs_i(i);
511 struct quad_buffer_head qbh;
512 struct dnode *dnode;
513 dnode_secno down, up, ndown;
514 int p;
515 struct hpfs_dirent *de;
516 int c1, c2 = 0;
517 try_it_again:
518 if (hpfs_stop_cycles(i->i_sb, dno, &c1, &c2, "delete_empty_dnode")) return;
519 if (!(dnode = hpfs_map_dnode(i->i_sb, dno, &qbh))) return;
520 if (le32_to_cpu(dnode->first_free) > 56) goto end;
521 if (le32_to_cpu(dnode->first_free) == 52 || le32_to_cpu(dnode->first_free) == 56) {
522 struct hpfs_dirent *de_end;
523 int root = dnode->root_dnode;
524 up = le32_to_cpu(dnode->up);
525 de = dnode_first_de(dnode);
526 down = de->down ? de_down_pointer(de) : 0;
527 if (hpfs_sb(i->i_sb)->sb_chk) if (root && !down) {
528 hpfs_error(i->i_sb, "delete_empty_dnode: root dnode %08x is empty", dno);
529 goto end;
530 }
531 hpfs_brelse4(&qbh);
532 hpfs_free_dnode(i->i_sb, dno);
533 i->i_size -= 2048;
534 i->i_blocks -= 4;
535 if (root) {
536 struct fnode *fnode;
537 struct buffer_head *bh;
538 struct dnode *d1;
539 struct quad_buffer_head qbh1;
540 if (hpfs_sb(i->i_sb)->sb_chk)
541 if (up != i->i_ino) {
542 hpfs_error(i->i_sb,
543 "bad pointer to fnode, dnode %08x, pointing to %08x, should be %08lx",
544 dno, up, (unsigned long)i->i_ino);
545 return;
546 }
547 if ((d1 = hpfs_map_dnode(i->i_sb, down, &qbh1))) {
548 d1->up = cpu_to_le32(up);
549 d1->root_dnode = 1;
550 hpfs_mark_4buffers_dirty(&qbh1);
551 hpfs_brelse4(&qbh1);
552 }
553 if ((fnode = hpfs_map_fnode(i->i_sb, up, &bh))) {
554 fnode->u.external[0].disk_secno = cpu_to_le32(down);
555 mark_buffer_dirty(bh);
556 brelse(bh);
557 }
558 hpfs_inode->i_dno = down;
559 for_all_poss(i, hpfs_pos_subst, ((loff_t)dno << 4) | 1, (loff_t) 12);
560 return;
561 }
562 if (!(dnode = hpfs_map_dnode(i->i_sb, up, &qbh))) return;
563 p = 1;
564 de_end = dnode_end_de(dnode);
565 for (de = dnode_first_de(dnode); de < de_end; de = de_next_de(de), p++)
566 if (de->down) if (de_down_pointer(de) == dno) goto fnd;
567 hpfs_error(i->i_sb, "delete_empty_dnode: pointer to dnode %08x not found in dnode %08x", dno, up);
568 goto end;
569 fnd:
570 for_all_poss(i, hpfs_pos_subst, ((loff_t)dno << 4) | 1, ((loff_t)up << 4) | p);
571 if (!down) {
572 de->down = 0;
573 de->length = cpu_to_le16(le16_to_cpu(de->length) - 4);
574 dnode->first_free = cpu_to_le32(le32_to_cpu(dnode->first_free) - 4);
575 memmove(de_next_de(de), (char *)de_next_de(de) + 4,
576 (char *)dnode + le32_to_cpu(dnode->first_free) - (char *)de_next_de(de));
577 } else {
578 struct dnode *d1;
579 struct quad_buffer_head qbh1;
580 *(dnode_secno *) ((void *) de + le16_to_cpu(de->length) - 4) = down;
581 if ((d1 = hpfs_map_dnode(i->i_sb, down, &qbh1))) {
582 d1->up = cpu_to_le32(up);
583 hpfs_mark_4buffers_dirty(&qbh1);
584 hpfs_brelse4(&qbh1);
585 }
586 }
587 } else {
588 hpfs_error(i->i_sb, "delete_empty_dnode: dnode %08x, first_free == %03x", dno, le32_to_cpu(dnode->first_free));
589 goto end;
590 }
591
592 if (!de->last) {
593 struct hpfs_dirent *de_next = de_next_de(de);
594 struct hpfs_dirent *de_cp;
595 struct dnode *d1;
596 struct quad_buffer_head qbh1;
597 if (!de_next->down) goto endm;
598 ndown = de_down_pointer(de_next);
599 if (!(de_cp = kmalloc(le16_to_cpu(de->length), GFP_NOFS))) {
600 printk("HPFS: out of memory for dtree balancing\n");
601 goto endm;
602 }
603 memcpy(de_cp, de, le16_to_cpu(de->length));
604 hpfs_delete_de(i->i_sb, dnode, de);
605 hpfs_mark_4buffers_dirty(&qbh);
606 hpfs_brelse4(&qbh);
607 for_all_poss(i, hpfs_pos_subst, ((loff_t)up << 4) | p, 4);
608 for_all_poss(i, hpfs_pos_del, ((loff_t)up << 4) | p, 1);
609 if (de_cp->down) if ((d1 = hpfs_map_dnode(i->i_sb, de_down_pointer(de_cp), &qbh1))) {
610 d1->up = cpu_to_le32(ndown);
611 hpfs_mark_4buffers_dirty(&qbh1);
612 hpfs_brelse4(&qbh1);
613 }
614 hpfs_add_to_dnode(i, ndown, de_cp->name, de_cp->namelen, de_cp, de_cp->down ? de_down_pointer(de_cp) : 0);
615 /*printk("UP-TO-DNODE: %08x (ndown = %08x, down = %08x, dno = %08x)\n", up, ndown, down, dno);*/
616 dno = up;
617 kfree(de_cp);
618 goto try_it_again;
619 } else {
620 struct hpfs_dirent *de_prev = dnode_pre_last_de(dnode);
621 struct hpfs_dirent *de_cp;
622 struct dnode *d1;
623 struct quad_buffer_head qbh1;
624 dnode_secno dlp;
625 if (!de_prev) {
626 hpfs_error(i->i_sb, "delete_empty_dnode: empty dnode %08x", up);
627 hpfs_mark_4buffers_dirty(&qbh);
628 hpfs_brelse4(&qbh);
629 dno = up;
630 goto try_it_again;
631 }
632 if (!de_prev->down) goto endm;
633 ndown = de_down_pointer(de_prev);
634 if ((d1 = hpfs_map_dnode(i->i_sb, ndown, &qbh1))) {
635 struct hpfs_dirent *del = dnode_last_de(d1);
636 dlp = del->down ? de_down_pointer(del) : 0;
637 if (!dlp && down) {
638 if (le32_to_cpu(d1->first_free) > 2044) {
639 if (hpfs_sb(i->i_sb)->sb_chk >= 2) {
640 printk("HPFS: warning: unbalanced dnode tree, see hpfs.txt 4 more info\n");
641 printk("HPFS: warning: terminating balancing operation\n");
642 }
643 hpfs_brelse4(&qbh1);
644 goto endm;
645 }
646 if (hpfs_sb(i->i_sb)->sb_chk >= 2) {
647 printk("HPFS: warning: unbalanced dnode tree, see hpfs.txt 4 more info\n");
648 printk("HPFS: warning: goin'on\n");
649 }
650 del->length = cpu_to_le16(le16_to_cpu(del->length) + 4);
651 del->down = 1;
652 d1->first_free = cpu_to_le32(le32_to_cpu(d1->first_free) + 4);
653 }
654 if (dlp && !down) {
655 del->length = cpu_to_le16(le16_to_cpu(del->length) - 4);
656 del->down = 0;
657 d1->first_free = cpu_to_le32(le32_to_cpu(d1->first_free) - 4);
658 } else if (down)
659 *(__le32 *) ((void *) del + le16_to_cpu(del->length) - 4) = cpu_to_le32(down);
660 } else goto endm;
661 if (!(de_cp = kmalloc(le16_to_cpu(de_prev->length), GFP_NOFS))) {
662 printk("HPFS: out of memory for dtree balancing\n");
663 hpfs_brelse4(&qbh1);
664 goto endm;
665 }
666 hpfs_mark_4buffers_dirty(&qbh1);
667 hpfs_brelse4(&qbh1);
668 memcpy(de_cp, de_prev, le16_to_cpu(de_prev->length));
669 hpfs_delete_de(i->i_sb, dnode, de_prev);
670 if (!de_prev->down) {
671 de_prev->length = cpu_to_le16(le16_to_cpu(de_prev->length) + 4);
672 de_prev->down = 1;
673 dnode->first_free = cpu_to_le32(le32_to_cpu(dnode->first_free) + 4);
674 }
675 *(__le32 *) ((void *) de_prev + le16_to_cpu(de_prev->length) - 4) = cpu_to_le32(ndown);
676 hpfs_mark_4buffers_dirty(&qbh);
677 hpfs_brelse4(&qbh);
678 for_all_poss(i, hpfs_pos_subst, ((loff_t)up << 4) | (p - 1), 4);
679 for_all_poss(i, hpfs_pos_subst, ((loff_t)up << 4) | p, ((loff_t)up << 4) | (p - 1));
680 if (down) if ((d1 = hpfs_map_dnode(i->i_sb, de_down_pointer(de), &qbh1))) {
681 d1->up = cpu_to_le32(ndown);
682 hpfs_mark_4buffers_dirty(&qbh1);
683 hpfs_brelse4(&qbh1);
684 }
685 hpfs_add_to_dnode(i, ndown, de_cp->name, de_cp->namelen, de_cp, dlp);
686 dno = up;
687 kfree(de_cp);
688 goto try_it_again;
689 }
690 endm:
691 hpfs_mark_4buffers_dirty(&qbh);
692 end:
693 hpfs_brelse4(&qbh);
694}
695
696
697/* Delete dirent from directory */
698
699int hpfs_remove_dirent(struct inode *i, dnode_secno dno, struct hpfs_dirent *de,
700 struct quad_buffer_head *qbh, int depth)
701{
702 struct dnode *dnode = qbh->data;
703 dnode_secno down = 0;
704 loff_t t;
705 if (de->first || de->last) {
706 hpfs_error(i->i_sb, "hpfs_remove_dirent: attempt to delete first or last dirent in dnode %08x", dno);
707 hpfs_brelse4(qbh);
708 return 1;
709 }
710 if (de->down) down = de_down_pointer(de);
711 if (depth && (de->down || (de == dnode_first_de(dnode) && de_next_de(de)->last))) {
712 if (hpfs_check_free_dnodes(i->i_sb, FREE_DNODES_DEL)) {
713 hpfs_brelse4(qbh);
714 return 2;
715 }
716 }
717 i->i_version++;
718 for_all_poss(i, hpfs_pos_del, (t = get_pos(dnode, de)) + 1, 1);
719 hpfs_delete_de(i->i_sb, dnode, de);
720 hpfs_mark_4buffers_dirty(qbh);
721 hpfs_brelse4(qbh);
722 if (down) {
723 dnode_secno a = move_to_top(i, down, dno);
724 for_all_poss(i, hpfs_pos_subst, 5, t);
725 if (a) delete_empty_dnode(i, a);
726 return !a;
727 }
728 delete_empty_dnode(i, dno);
729 return 0;
730}
731
732void hpfs_count_dnodes(struct super_block *s, dnode_secno dno, int *n_dnodes,
733 int *n_subdirs, int *n_items)
734{
735 struct dnode *dnode;
736 struct quad_buffer_head qbh;
737 struct hpfs_dirent *de;
738 dnode_secno ptr, odno = 0;
739 int c1, c2 = 0;
740 int d1, d2 = 0;
741 go_down:
742 if (n_dnodes) (*n_dnodes)++;
743 if (hpfs_sb(s)->sb_chk)
744 if (hpfs_stop_cycles(s, dno, &c1, &c2, "hpfs_count_dnodes #1")) return;
745 ptr = 0;
746 go_up:
747 if (!(dnode = hpfs_map_dnode(s, dno, &qbh))) return;
748 if (hpfs_sb(s)->sb_chk) if (odno && odno != -1 && le32_to_cpu(dnode->up) != odno)
749 hpfs_error(s, "hpfs_count_dnodes: bad up pointer; dnode %08x, down %08x points to %08x", odno, dno, le32_to_cpu(dnode->up));
750 de = dnode_first_de(dnode);
751 if (ptr) while(1) {
752 if (de->down) if (de_down_pointer(de) == ptr) goto process_de;
753 if (de->last) {
754 hpfs_brelse4(&qbh);
755 hpfs_error(s, "hpfs_count_dnodes: pointer to dnode %08x not found in dnode %08x, got here from %08x",
756 ptr, dno, odno);
757 return;
758 }
759 de = de_next_de(de);
760 }
761 next_de:
762 if (de->down) {
763 odno = dno;
764 dno = de_down_pointer(de);
765 hpfs_brelse4(&qbh);
766 goto go_down;
767 }
768 process_de:
769 if (!de->first && !de->last && de->directory && n_subdirs) (*n_subdirs)++;
770 if (!de->first && !de->last && n_items) (*n_items)++;
771 if ((de = de_next_de(de)) < dnode_end_de(dnode)) goto next_de;
772 ptr = dno;
773 dno = le32_to_cpu(dnode->up);
774 if (dnode->root_dnode) {
775 hpfs_brelse4(&qbh);
776 return;
777 }
778 hpfs_brelse4(&qbh);
779 if (hpfs_sb(s)->sb_chk)
780 if (hpfs_stop_cycles(s, ptr, &d1, &d2, "hpfs_count_dnodes #2")) return;
781 odno = -1;
782 goto go_up;
783}
784
785static struct hpfs_dirent *map_nth_dirent(struct super_block *s, dnode_secno dno, int n,
786 struct quad_buffer_head *qbh, struct dnode **dn)
787{
788 int i;
789 struct hpfs_dirent *de, *de_end;
790 struct dnode *dnode;
791 dnode = hpfs_map_dnode(s, dno, qbh);
792 if (!dnode) return NULL;
793 if (dn) *dn=dnode;
794 de = dnode_first_de(dnode);
795 de_end = dnode_end_de(dnode);
796 for (i = 1; de < de_end; i++, de = de_next_de(de)) {
797 if (i == n) {
798 return de;
799 }
800 if (de->last) break;
801 }
802 hpfs_brelse4(qbh);
803 hpfs_error(s, "map_nth_dirent: n too high; dnode = %08x, requested %08x", dno, n);
804 return NULL;
805}
806
807dnode_secno hpfs_de_as_down_as_possible(struct super_block *s, dnode_secno dno)
808{
809 struct quad_buffer_head qbh;
810 dnode_secno d = dno;
811 dnode_secno up = 0;
812 struct hpfs_dirent *de;
813 int c1, c2 = 0;
814
815 again:
816 if (hpfs_sb(s)->sb_chk)
817 if (hpfs_stop_cycles(s, d, &c1, &c2, "hpfs_de_as_down_as_possible"))
818 return d;
819 if (!(de = map_nth_dirent(s, d, 1, &qbh, NULL))) return dno;
820 if (hpfs_sb(s)->sb_chk)
821 if (up && le32_to_cpu(((struct dnode *)qbh.data)->up) != up)
822 hpfs_error(s, "hpfs_de_as_down_as_possible: bad up pointer; dnode %08x, down %08x points to %08x", up, d, le32_to_cpu(((struct dnode *)qbh.data)->up));
823 if (!de->down) {
824 hpfs_brelse4(&qbh);
825 return d;
826 }
827 up = d;
828 d = de_down_pointer(de);
829 hpfs_brelse4(&qbh);
830 goto again;
831}
832
833struct hpfs_dirent *map_pos_dirent(struct inode *inode, loff_t *posp,
834 struct quad_buffer_head *qbh)
835{
836 loff_t pos;
837 unsigned c;
838 dnode_secno dno;
839 struct hpfs_dirent *de, *d;
840 struct hpfs_dirent *up_de;
841 struct hpfs_dirent *end_up_de;
842 struct dnode *dnode;
843 struct dnode *up_dnode;
844 struct quad_buffer_head qbh0;
845
846 pos = *posp;
847 dno = pos >> 6 << 2;
848 pos &= 077;
849 if (!(de = map_nth_dirent(inode->i_sb, dno, pos, qbh, &dnode)))
850 goto bail;
851
852 /* Going to the next dirent */
853 if ((d = de_next_de(de)) < dnode_end_de(dnode)) {
854 if (!(++*posp & 077)) {
855 hpfs_error(inode->i_sb,
856 "map_pos_dirent: pos crossed dnode boundary; pos = %08llx",
857 (unsigned long long)*posp);
858 goto bail;
859 }
860 /* We're going down the tree */
861 if (d->down) {
862 *posp = ((loff_t) hpfs_de_as_down_as_possible(inode->i_sb, de_down_pointer(d)) << 4) + 1;
863 }
864
865 return de;
866 }
867
868 /* Going up */
869 if (dnode->root_dnode) goto bail;
870
871 if (!(up_dnode = hpfs_map_dnode(inode->i_sb, le32_to_cpu(dnode->up), &qbh0)))
872 goto bail;
873
874 end_up_de = dnode_end_de(up_dnode);
875 c = 0;
876 for (up_de = dnode_first_de(up_dnode); up_de < end_up_de;
877 up_de = de_next_de(up_de)) {
878 if (!(++c & 077)) hpfs_error(inode->i_sb,
879 "map_pos_dirent: pos crossed dnode boundary; dnode = %08x", le32_to_cpu(dnode->up));
880 if (up_de->down && de_down_pointer(up_de) == dno) {
881 *posp = ((loff_t) le32_to_cpu(dnode->up) << 4) + c;
882 hpfs_brelse4(&qbh0);
883 return de;
884 }
885 }
886
887 hpfs_error(inode->i_sb, "map_pos_dirent: pointer to dnode %08x not found in parent dnode %08x",
888 dno, le32_to_cpu(dnode->up));
889 hpfs_brelse4(&qbh0);
890
891 bail:
892 *posp = 12;
893 return de;
894}
895
896/* Find a dirent in tree */
897
898struct hpfs_dirent *map_dirent(struct inode *inode, dnode_secno dno,
899 const unsigned char *name, unsigned len,
900 dnode_secno *dd, struct quad_buffer_head *qbh)
901{
902 struct dnode *dnode;
903 struct hpfs_dirent *de;
904 struct hpfs_dirent *de_end;
905 int c1, c2 = 0;
906
907 if (!S_ISDIR(inode->i_mode)) hpfs_error(inode->i_sb, "map_dirent: not a directory\n");
908 again:
909 if (hpfs_sb(inode->i_sb)->sb_chk)
910 if (hpfs_stop_cycles(inode->i_sb, dno, &c1, &c2, "map_dirent")) return NULL;
911 if (!(dnode = hpfs_map_dnode(inode->i_sb, dno, qbh))) return NULL;
912
913 de_end = dnode_end_de(dnode);
914 for (de = dnode_first_de(dnode); de < de_end; de = de_next_de(de)) {
915 int t = hpfs_compare_names(inode->i_sb, name, len, de->name, de->namelen, de->last);
916 if (!t) {
917 if (dd) *dd = dno;
918 return de;
919 }
920 if (t < 0) {
921 if (de->down) {
922 dno = de_down_pointer(de);
923 hpfs_brelse4(qbh);
924 goto again;
925 }
926 break;
927 }
928 }
929 hpfs_brelse4(qbh);
930 return NULL;
931}
932
933/*
934 * Remove empty directory. In normal cases it is only one dnode with two
935 * entries, but we must handle also such obscure cases when it's a tree
936 * of empty dnodes.
937 */
938
939void hpfs_remove_dtree(struct super_block *s, dnode_secno dno)
940{
941 struct quad_buffer_head qbh;
942 struct dnode *dnode;
943 struct hpfs_dirent *de;
944 dnode_secno d1, d2, rdno = dno;
945 while (1) {
946 if (!(dnode = hpfs_map_dnode(s, dno, &qbh))) return;
947 de = dnode_first_de(dnode);
948 if (de->last) {
949 if (de->down) d1 = de_down_pointer(de);
950 else goto error;
951 hpfs_brelse4(&qbh);
952 hpfs_free_dnode(s, dno);
953 dno = d1;
954 } else break;
955 }
956 if (!de->first) goto error;
957 d1 = de->down ? de_down_pointer(de) : 0;
958 de = de_next_de(de);
959 if (!de->last) goto error;
960 d2 = de->down ? de_down_pointer(de) : 0;
961 hpfs_brelse4(&qbh);
962 hpfs_free_dnode(s, dno);
963 do {
964 while (d1) {
965 if (!(dnode = hpfs_map_dnode(s, dno = d1, &qbh))) return;
966 de = dnode_first_de(dnode);
967 if (!de->last) goto error;
968 d1 = de->down ? de_down_pointer(de) : 0;
969 hpfs_brelse4(&qbh);
970 hpfs_free_dnode(s, dno);
971 }
972 d1 = d2;
973 d2 = 0;
974 } while (d1);
975 return;
976 error:
977 hpfs_brelse4(&qbh);
978 hpfs_free_dnode(s, dno);
979 hpfs_error(s, "directory %08x is corrupted or not empty", rdno);
980}
981
982/*
983 * Find dirent for specified fnode. Use truncated 15-char name in fnode as
984 * a help for searching.
985 */
986
987struct hpfs_dirent *map_fnode_dirent(struct super_block *s, fnode_secno fno,
988 struct fnode *f, struct quad_buffer_head *qbh)
989{
990 unsigned char *name1;
991 unsigned char *name2;
992 int name1len, name2len;
993 struct dnode *d;
994 dnode_secno dno, downd;
995 struct fnode *upf;
996 struct buffer_head *bh;
997 struct hpfs_dirent *de, *de_end;
998 int c;
999 int c1, c2 = 0;
1000 int d1, d2 = 0;
1001 name1 = f->name;
1002 if (!(name2 = kmalloc(256, GFP_NOFS))) {
1003 printk("HPFS: out of memory, can't map dirent\n");
1004 return NULL;
1005 }
1006 if (f->len <= 15)
1007 memcpy(name2, name1, name1len = name2len = f->len);
1008 else {
1009 memcpy(name2, name1, 15);
1010 memset(name2 + 15, 0xff, 256 - 15);
1011 /*name2[15] = 0xff;*/
1012 name1len = 15; name2len = 256;
1013 }
1014 if (!(upf = hpfs_map_fnode(s, le32_to_cpu(f->up), &bh))) {
1015 kfree(name2);
1016 return NULL;
1017 }
1018 if (!fnode_is_dir(upf)) {
1019 brelse(bh);
1020 hpfs_error(s, "fnode %08x has non-directory parent %08x", fno, le32_to_cpu(f->up));
1021 kfree(name2);
1022 return NULL;
1023 }
1024 dno = le32_to_cpu(upf->u.external[0].disk_secno);
1025 brelse(bh);
1026 go_down:
1027 downd = 0;
1028 go_up:
1029 if (!(d = hpfs_map_dnode(s, dno, qbh))) {
1030 kfree(name2);
1031 return NULL;
1032 }
1033 de_end = dnode_end_de(d);
1034 de = dnode_first_de(d);
1035 if (downd) {
1036 while (de < de_end) {
1037 if (de->down) if (de_down_pointer(de) == downd) goto f;
1038 de = de_next_de(de);
1039 }
1040 hpfs_error(s, "pointer to dnode %08x not found in dnode %08x", downd, dno);
1041 hpfs_brelse4(qbh);
1042 kfree(name2);
1043 return NULL;
1044 }
1045 next_de:
1046 if (le32_to_cpu(de->fnode) == fno) {
1047 kfree(name2);
1048 return de;
1049 }
1050 c = hpfs_compare_names(s, name1, name1len, de->name, de->namelen, de->last);
1051 if (c < 0 && de->down) {
1052 dno = de_down_pointer(de);
1053 hpfs_brelse4(qbh);
1054 if (hpfs_sb(s)->sb_chk)
1055 if (hpfs_stop_cycles(s, dno, &c1, &c2, "map_fnode_dirent #1")) {
1056 kfree(name2);
1057 return NULL;
1058 }
1059 goto go_down;
1060 }
1061 f:
1062 if (le32_to_cpu(de->fnode) == fno) {
1063 kfree(name2);
1064 return de;
1065 }
1066 c = hpfs_compare_names(s, name2, name2len, de->name, de->namelen, de->last);
1067 if (c < 0 && !de->last) goto not_found;
1068 if ((de = de_next_de(de)) < de_end) goto next_de;
1069 if (d->root_dnode) goto not_found;
1070 downd = dno;
1071 dno = le32_to_cpu(d->up);
1072 hpfs_brelse4(qbh);
1073 if (hpfs_sb(s)->sb_chk)
1074 if (hpfs_stop_cycles(s, downd, &d1, &d2, "map_fnode_dirent #2")) {
1075 kfree(name2);
1076 return NULL;
1077 }
1078 goto go_up;
1079 not_found:
1080 hpfs_brelse4(qbh);
1081 hpfs_error(s, "dirent for fnode %08x not found", fno);
1082 kfree(name2);
1083 return NULL;
1084}