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1/*
2 * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
3 */
4
5#include <linux/time.h>
6#include <linux/reiserfs_fs.h>
7
8// this contains item handlers for old item types: sd, direct,
9// indirect, directory
10
11/* and where are the comments? how about saying where we can find an
12 explanation of each item handler method? -Hans */
13
14//////////////////////////////////////////////////////////////////////////////
15// stat data functions
16//
17static int sd_bytes_number(struct item_head *ih, int block_size)
18{
19 return 0;
20}
21
22static void sd_decrement_key(struct cpu_key *key)
23{
24 key->on_disk_key.k_objectid--;
25 set_cpu_key_k_type(key, TYPE_ANY);
26 set_cpu_key_k_offset(key, (loff_t)(~0ULL >> 1));
27}
28
29static int sd_is_left_mergeable(struct reiserfs_key *key, unsigned long bsize)
30{
31 return 0;
32}
33
34static char *print_time(time_t t)
35{
36 static char timebuf[256];
37
38 sprintf(timebuf, "%ld", t);
39 return timebuf;
40}
41
42static void sd_print_item(struct item_head *ih, char *item)
43{
44 printk("\tmode | size | nlinks | first direct | mtime\n");
45 if (stat_data_v1(ih)) {
46 struct stat_data_v1 *sd = (struct stat_data_v1 *)item;
47
48 printk("\t0%-6o | %6u | %2u | %d | %s\n", sd_v1_mode(sd),
49 sd_v1_size(sd), sd_v1_nlink(sd),
50 sd_v1_first_direct_byte(sd),
51 print_time(sd_v1_mtime(sd)));
52 } else {
53 struct stat_data *sd = (struct stat_data *)item;
54
55 printk("\t0%-6o | %6Lu | %2u | %d | %s\n", sd_v2_mode(sd),
56 (unsigned long long)sd_v2_size(sd), sd_v2_nlink(sd),
57 sd_v2_rdev(sd), print_time(sd_v2_mtime(sd)));
58 }
59}
60
61static void sd_check_item(struct item_head *ih, char *item)
62{
63 // FIXME: type something here!
64}
65
66static int sd_create_vi(struct virtual_node *vn,
67 struct virtual_item *vi,
68 int is_affected, int insert_size)
69{
70 vi->vi_index = TYPE_STAT_DATA;
71 //vi->vi_type |= VI_TYPE_STAT_DATA;// not needed?
72 return 0;
73}
74
75static int sd_check_left(struct virtual_item *vi, int free,
76 int start_skip, int end_skip)
77{
78 BUG_ON(start_skip || end_skip);
79 return -1;
80}
81
82static int sd_check_right(struct virtual_item *vi, int free)
83{
84 return -1;
85}
86
87static int sd_part_size(struct virtual_item *vi, int first, int count)
88{
89 BUG_ON(count);
90 return 0;
91}
92
93static int sd_unit_num(struct virtual_item *vi)
94{
95 return vi->vi_item_len - IH_SIZE;
96}
97
98static void sd_print_vi(struct virtual_item *vi)
99{
100 reiserfs_warning(NULL, "reiserfs-16100",
101 "STATDATA, index %d, type 0x%x, %h",
102 vi->vi_index, vi->vi_type, vi->vi_ih);
103}
104
105static struct item_operations stat_data_ops = {
106 .bytes_number = sd_bytes_number,
107 .decrement_key = sd_decrement_key,
108 .is_left_mergeable = sd_is_left_mergeable,
109 .print_item = sd_print_item,
110 .check_item = sd_check_item,
111
112 .create_vi = sd_create_vi,
113 .check_left = sd_check_left,
114 .check_right = sd_check_right,
115 .part_size = sd_part_size,
116 .unit_num = sd_unit_num,
117 .print_vi = sd_print_vi
118};
119
120//////////////////////////////////////////////////////////////////////////////
121// direct item functions
122//
123static int direct_bytes_number(struct item_head *ih, int block_size)
124{
125 return ih_item_len(ih);
126}
127
128// FIXME: this should probably switch to indirect as well
129static void direct_decrement_key(struct cpu_key *key)
130{
131 cpu_key_k_offset_dec(key);
132 if (cpu_key_k_offset(key) == 0)
133 set_cpu_key_k_type(key, TYPE_STAT_DATA);
134}
135
136static int direct_is_left_mergeable(struct reiserfs_key *key,
137 unsigned long bsize)
138{
139 int version = le_key_version(key);
140 return ((le_key_k_offset(version, key) & (bsize - 1)) != 1);
141}
142
143static void direct_print_item(struct item_head *ih, char *item)
144{
145 int j = 0;
146
147// return;
148 printk("\"");
149 while (j < ih_item_len(ih))
150 printk("%c", item[j++]);
151 printk("\"\n");
152}
153
154static void direct_check_item(struct item_head *ih, char *item)
155{
156 // FIXME: type something here!
157}
158
159static int direct_create_vi(struct virtual_node *vn,
160 struct virtual_item *vi,
161 int is_affected, int insert_size)
162{
163 vi->vi_index = TYPE_DIRECT;
164 //vi->vi_type |= VI_TYPE_DIRECT;
165 return 0;
166}
167
168static int direct_check_left(struct virtual_item *vi, int free,
169 int start_skip, int end_skip)
170{
171 int bytes;
172
173 bytes = free - free % 8;
174 return bytes ? : -1;
175}
176
177static int direct_check_right(struct virtual_item *vi, int free)
178{
179 return direct_check_left(vi, free, 0, 0);
180}
181
182static int direct_part_size(struct virtual_item *vi, int first, int count)
183{
184 return count;
185}
186
187static int direct_unit_num(struct virtual_item *vi)
188{
189 return vi->vi_item_len - IH_SIZE;
190}
191
192static void direct_print_vi(struct virtual_item *vi)
193{
194 reiserfs_warning(NULL, "reiserfs-16101",
195 "DIRECT, index %d, type 0x%x, %h",
196 vi->vi_index, vi->vi_type, vi->vi_ih);
197}
198
199static struct item_operations direct_ops = {
200 .bytes_number = direct_bytes_number,
201 .decrement_key = direct_decrement_key,
202 .is_left_mergeable = direct_is_left_mergeable,
203 .print_item = direct_print_item,
204 .check_item = direct_check_item,
205
206 .create_vi = direct_create_vi,
207 .check_left = direct_check_left,
208 .check_right = direct_check_right,
209 .part_size = direct_part_size,
210 .unit_num = direct_unit_num,
211 .print_vi = direct_print_vi
212};
213
214//////////////////////////////////////////////////////////////////////////////
215// indirect item functions
216//
217
218static int indirect_bytes_number(struct item_head *ih, int block_size)
219{
220 return ih_item_len(ih) / UNFM_P_SIZE * block_size; //- get_ih_free_space (ih);
221}
222
223// decrease offset, if it becomes 0, change type to stat data
224static void indirect_decrement_key(struct cpu_key *key)
225{
226 cpu_key_k_offset_dec(key);
227 if (cpu_key_k_offset(key) == 0)
228 set_cpu_key_k_type(key, TYPE_STAT_DATA);
229}
230
231// if it is not first item of the body, then it is mergeable
232static int indirect_is_left_mergeable(struct reiserfs_key *key,
233 unsigned long bsize)
234{
235 int version = le_key_version(key);
236 return (le_key_k_offset(version, key) != 1);
237}
238
239// printing of indirect item
240static void start_new_sequence(__u32 * start, int *len, __u32 new)
241{
242 *start = new;
243 *len = 1;
244}
245
246static int sequence_finished(__u32 start, int *len, __u32 new)
247{
248 if (start == INT_MAX)
249 return 1;
250
251 if (start == 0 && new == 0) {
252 (*len)++;
253 return 0;
254 }
255 if (start != 0 && (start + *len) == new) {
256 (*len)++;
257 return 0;
258 }
259 return 1;
260}
261
262static void print_sequence(__u32 start, int len)
263{
264 if (start == INT_MAX)
265 return;
266
267 if (len == 1)
268 printk(" %d", start);
269 else
270 printk(" %d(%d)", start, len);
271}
272
273static void indirect_print_item(struct item_head *ih, char *item)
274{
275 int j;
276 __le32 *unp;
277 __u32 prev = INT_MAX;
278 int num = 0;
279
280 unp = (__le32 *) item;
281
282 if (ih_item_len(ih) % UNFM_P_SIZE)
283 reiserfs_warning(NULL, "reiserfs-16102", "invalid item len");
284
285 printk("%d pointers\n[ ", (int)I_UNFM_NUM(ih));
286 for (j = 0; j < I_UNFM_NUM(ih); j++) {
287 if (sequence_finished(prev, &num, get_block_num(unp, j))) {
288 print_sequence(prev, num);
289 start_new_sequence(&prev, &num, get_block_num(unp, j));
290 }
291 }
292 print_sequence(prev, num);
293 printk("]\n");
294}
295
296static void indirect_check_item(struct item_head *ih, char *item)
297{
298 // FIXME: type something here!
299}
300
301static int indirect_create_vi(struct virtual_node *vn,
302 struct virtual_item *vi,
303 int is_affected, int insert_size)
304{
305 vi->vi_index = TYPE_INDIRECT;
306 //vi->vi_type |= VI_TYPE_INDIRECT;
307 return 0;
308}
309
310static int indirect_check_left(struct virtual_item *vi, int free,
311 int start_skip, int end_skip)
312{
313 int bytes;
314
315 bytes = free - free % UNFM_P_SIZE;
316 return bytes ? : -1;
317}
318
319static int indirect_check_right(struct virtual_item *vi, int free)
320{
321 return indirect_check_left(vi, free, 0, 0);
322}
323
324// return size in bytes of 'units' units. If first == 0 - calculate from the head (left), otherwise - from tail (right)
325static int indirect_part_size(struct virtual_item *vi, int first, int units)
326{
327 // unit of indirect item is byte (yet)
328 return units;
329}
330
331static int indirect_unit_num(struct virtual_item *vi)
332{
333 // unit of indirect item is byte (yet)
334 return vi->vi_item_len - IH_SIZE;
335}
336
337static void indirect_print_vi(struct virtual_item *vi)
338{
339 reiserfs_warning(NULL, "reiserfs-16103",
340 "INDIRECT, index %d, type 0x%x, %h",
341 vi->vi_index, vi->vi_type, vi->vi_ih);
342}
343
344static struct item_operations indirect_ops = {
345 .bytes_number = indirect_bytes_number,
346 .decrement_key = indirect_decrement_key,
347 .is_left_mergeable = indirect_is_left_mergeable,
348 .print_item = indirect_print_item,
349 .check_item = indirect_check_item,
350
351 .create_vi = indirect_create_vi,
352 .check_left = indirect_check_left,
353 .check_right = indirect_check_right,
354 .part_size = indirect_part_size,
355 .unit_num = indirect_unit_num,
356 .print_vi = indirect_print_vi
357};
358
359//////////////////////////////////////////////////////////////////////////////
360// direntry functions
361//
362
363static int direntry_bytes_number(struct item_head *ih, int block_size)
364{
365 reiserfs_warning(NULL, "vs-16090",
366 "bytes number is asked for direntry");
367 return 0;
368}
369
370static void direntry_decrement_key(struct cpu_key *key)
371{
372 cpu_key_k_offset_dec(key);
373 if (cpu_key_k_offset(key) == 0)
374 set_cpu_key_k_type(key, TYPE_STAT_DATA);
375}
376
377static int direntry_is_left_mergeable(struct reiserfs_key *key,
378 unsigned long bsize)
379{
380 if (le32_to_cpu(key->u.k_offset_v1.k_offset) == DOT_OFFSET)
381 return 0;
382 return 1;
383
384}
385
386static void direntry_print_item(struct item_head *ih, char *item)
387{
388 int i;
389 int namelen;
390 struct reiserfs_de_head *deh;
391 char *name;
392 static char namebuf[80];
393
394 printk("\n # %-15s%-30s%-15s%-15s%-15s\n", "Name",
395 "Key of pointed object", "Hash", "Gen number", "Status");
396
397 deh = (struct reiserfs_de_head *)item;
398
399 for (i = 0; i < I_ENTRY_COUNT(ih); i++, deh++) {
400 namelen =
401 (i ? (deh_location(deh - 1)) : ih_item_len(ih)) -
402 deh_location(deh);
403 name = item + deh_location(deh);
404 if (name[namelen - 1] == 0)
405 namelen = strlen(name);
406 namebuf[0] = '"';
407 if (namelen > sizeof(namebuf) - 3) {
408 strncpy(namebuf + 1, name, sizeof(namebuf) - 3);
409 namebuf[sizeof(namebuf) - 2] = '"';
410 namebuf[sizeof(namebuf) - 1] = 0;
411 } else {
412 memcpy(namebuf + 1, name, namelen);
413 namebuf[namelen + 1] = '"';
414 namebuf[namelen + 2] = 0;
415 }
416
417 printk("%d: %-15s%-15d%-15d%-15Ld%-15Ld(%s)\n",
418 i, namebuf,
419 deh_dir_id(deh), deh_objectid(deh),
420 GET_HASH_VALUE(deh_offset(deh)),
421 GET_GENERATION_NUMBER((deh_offset(deh))),
422 (de_hidden(deh)) ? "HIDDEN" : "VISIBLE");
423 }
424}
425
426static void direntry_check_item(struct item_head *ih, char *item)
427{
428 int i;
429 struct reiserfs_de_head *deh;
430
431 // FIXME: type something here!
432 deh = (struct reiserfs_de_head *)item;
433 for (i = 0; i < I_ENTRY_COUNT(ih); i++, deh++) {
434 ;
435 }
436}
437
438#define DIRENTRY_VI_FIRST_DIRENTRY_ITEM 1
439
440/*
441 * function returns old entry number in directory item in real node
442 * using new entry number in virtual item in virtual node */
443static inline int old_entry_num(int is_affected, int virtual_entry_num,
444 int pos_in_item, int mode)
445{
446 if (mode == M_INSERT || mode == M_DELETE)
447 return virtual_entry_num;
448
449 if (!is_affected)
450 /* cut or paste is applied to another item */
451 return virtual_entry_num;
452
453 if (virtual_entry_num < pos_in_item)
454 return virtual_entry_num;
455
456 if (mode == M_CUT)
457 return virtual_entry_num + 1;
458
459 RFALSE(mode != M_PASTE || virtual_entry_num == 0,
460 "vs-8015: old_entry_num: mode must be M_PASTE (mode = \'%c\'",
461 mode);
462
463 return virtual_entry_num - 1;
464}
465
466/* Create an array of sizes of directory entries for virtual
467 item. Return space used by an item. FIXME: no control over
468 consuming of space used by this item handler */
469static int direntry_create_vi(struct virtual_node *vn,
470 struct virtual_item *vi,
471 int is_affected, int insert_size)
472{
473 struct direntry_uarea *dir_u = vi->vi_uarea;
474 int i, j;
475 int size = sizeof(struct direntry_uarea);
476 struct reiserfs_de_head *deh;
477
478 vi->vi_index = TYPE_DIRENTRY;
479
480 BUG_ON(!(vi->vi_ih) || !vi->vi_item);
481
482 dir_u->flags = 0;
483 if (le_ih_k_offset(vi->vi_ih) == DOT_OFFSET)
484 dir_u->flags |= DIRENTRY_VI_FIRST_DIRENTRY_ITEM;
485
486 deh = (struct reiserfs_de_head *)(vi->vi_item);
487
488 /* virtual directory item have this amount of entry after */
489 dir_u->entry_count = ih_entry_count(vi->vi_ih) +
490 ((is_affected) ? ((vn->vn_mode == M_CUT) ? -1 :
491 (vn->vn_mode == M_PASTE ? 1 : 0)) : 0);
492
493 for (i = 0; i < dir_u->entry_count; i++) {
494 j = old_entry_num(is_affected, i, vn->vn_pos_in_item,
495 vn->vn_mode);
496 dir_u->entry_sizes[i] =
497 (j ? deh_location(&(deh[j - 1])) : ih_item_len(vi->vi_ih)) -
498 deh_location(&(deh[j])) + DEH_SIZE;
499 }
500
501 size += (dir_u->entry_count * sizeof(short));
502
503 /* set size of pasted entry */
504 if (is_affected && vn->vn_mode == M_PASTE)
505 dir_u->entry_sizes[vn->vn_pos_in_item] = insert_size;
506
507#ifdef CONFIG_REISERFS_CHECK
508 /* compare total size of entries with item length */
509 {
510 int k, l;
511
512 l = 0;
513 for (k = 0; k < dir_u->entry_count; k++)
514 l += dir_u->entry_sizes[k];
515
516 if (l + IH_SIZE != vi->vi_item_len +
517 ((is_affected
518 && (vn->vn_mode == M_PASTE
519 || vn->vn_mode == M_CUT)) ? insert_size : 0)) {
520 reiserfs_panic(NULL, "vs-8025", "(mode==%c, "
521 "insert_size==%d), invalid length of "
522 "directory item",
523 vn->vn_mode, insert_size);
524 }
525 }
526#endif
527
528 return size;
529
530}
531
532//
533// return number of entries which may fit into specified amount of
534// free space, or -1 if free space is not enough even for 1 entry
535//
536static int direntry_check_left(struct virtual_item *vi, int free,
537 int start_skip, int end_skip)
538{
539 int i;
540 int entries = 0;
541 struct direntry_uarea *dir_u = vi->vi_uarea;
542
543 for (i = start_skip; i < dir_u->entry_count - end_skip; i++) {
544 if (dir_u->entry_sizes[i] > free)
545 /* i-th entry doesn't fit into the remaining free space */
546 break;
547
548 free -= dir_u->entry_sizes[i];
549 entries++;
550 }
551
552 if (entries == dir_u->entry_count) {
553 reiserfs_panic(NULL, "item_ops-1",
554 "free space %d, entry_count %d", free,
555 dir_u->entry_count);
556 }
557
558 /* "." and ".." can not be separated from each other */
559 if (start_skip == 0 && (dir_u->flags & DIRENTRY_VI_FIRST_DIRENTRY_ITEM)
560 && entries < 2)
561 entries = 0;
562
563 return entries ? : -1;
564}
565
566static int direntry_check_right(struct virtual_item *vi, int free)
567{
568 int i;
569 int entries = 0;
570 struct direntry_uarea *dir_u = vi->vi_uarea;
571
572 for (i = dir_u->entry_count - 1; i >= 0; i--) {
573 if (dir_u->entry_sizes[i] > free)
574 /* i-th entry doesn't fit into the remaining free space */
575 break;
576
577 free -= dir_u->entry_sizes[i];
578 entries++;
579 }
580 BUG_ON(entries == dir_u->entry_count);
581
582 /* "." and ".." can not be separated from each other */
583 if ((dir_u->flags & DIRENTRY_VI_FIRST_DIRENTRY_ITEM)
584 && entries > dir_u->entry_count - 2)
585 entries = dir_u->entry_count - 2;
586
587 return entries ? : -1;
588}
589
590/* sum of entry sizes between from-th and to-th entries including both edges */
591static int direntry_part_size(struct virtual_item *vi, int first, int count)
592{
593 int i, retval;
594 int from, to;
595 struct direntry_uarea *dir_u = vi->vi_uarea;
596
597 retval = 0;
598 if (first == 0)
599 from = 0;
600 else
601 from = dir_u->entry_count - count;
602 to = from + count - 1;
603
604 for (i = from; i <= to; i++)
605 retval += dir_u->entry_sizes[i];
606
607 return retval;
608}
609
610static int direntry_unit_num(struct virtual_item *vi)
611{
612 struct direntry_uarea *dir_u = vi->vi_uarea;
613
614 return dir_u->entry_count;
615}
616
617static void direntry_print_vi(struct virtual_item *vi)
618{
619 int i;
620 struct direntry_uarea *dir_u = vi->vi_uarea;
621
622 reiserfs_warning(NULL, "reiserfs-16104",
623 "DIRENTRY, index %d, type 0x%x, %h, flags 0x%x",
624 vi->vi_index, vi->vi_type, vi->vi_ih, dir_u->flags);
625 printk("%d entries: ", dir_u->entry_count);
626 for (i = 0; i < dir_u->entry_count; i++)
627 printk("%d ", dir_u->entry_sizes[i]);
628 printk("\n");
629}
630
631static struct item_operations direntry_ops = {
632 .bytes_number = direntry_bytes_number,
633 .decrement_key = direntry_decrement_key,
634 .is_left_mergeable = direntry_is_left_mergeable,
635 .print_item = direntry_print_item,
636 .check_item = direntry_check_item,
637
638 .create_vi = direntry_create_vi,
639 .check_left = direntry_check_left,
640 .check_right = direntry_check_right,
641 .part_size = direntry_part_size,
642 .unit_num = direntry_unit_num,
643 .print_vi = direntry_print_vi
644};
645
646//////////////////////////////////////////////////////////////////////////////
647// Error catching functions to catch errors caused by incorrect item types.
648//
649static int errcatch_bytes_number(struct item_head *ih, int block_size)
650{
651 reiserfs_warning(NULL, "green-16001",
652 "Invalid item type observed, run fsck ASAP");
653 return 0;
654}
655
656static void errcatch_decrement_key(struct cpu_key *key)
657{
658 reiserfs_warning(NULL, "green-16002",
659 "Invalid item type observed, run fsck ASAP");
660}
661
662static int errcatch_is_left_mergeable(struct reiserfs_key *key,
663 unsigned long bsize)
664{
665 reiserfs_warning(NULL, "green-16003",
666 "Invalid item type observed, run fsck ASAP");
667 return 0;
668}
669
670static void errcatch_print_item(struct item_head *ih, char *item)
671{
672 reiserfs_warning(NULL, "green-16004",
673 "Invalid item type observed, run fsck ASAP");
674}
675
676static void errcatch_check_item(struct item_head *ih, char *item)
677{
678 reiserfs_warning(NULL, "green-16005",
679 "Invalid item type observed, run fsck ASAP");
680}
681
682static int errcatch_create_vi(struct virtual_node *vn,
683 struct virtual_item *vi,
684 int is_affected, int insert_size)
685{
686 reiserfs_warning(NULL, "green-16006",
687 "Invalid item type observed, run fsck ASAP");
688 return 0; // We might return -1 here as well, but it won't help as create_virtual_node() from where
689 // this operation is called from is of return type void.
690}
691
692static int errcatch_check_left(struct virtual_item *vi, int free,
693 int start_skip, int end_skip)
694{
695 reiserfs_warning(NULL, "green-16007",
696 "Invalid item type observed, run fsck ASAP");
697 return -1;
698}
699
700static int errcatch_check_right(struct virtual_item *vi, int free)
701{
702 reiserfs_warning(NULL, "green-16008",
703 "Invalid item type observed, run fsck ASAP");
704 return -1;
705}
706
707static int errcatch_part_size(struct virtual_item *vi, int first, int count)
708{
709 reiserfs_warning(NULL, "green-16009",
710 "Invalid item type observed, run fsck ASAP");
711 return 0;
712}
713
714static int errcatch_unit_num(struct virtual_item *vi)
715{
716 reiserfs_warning(NULL, "green-16010",
717 "Invalid item type observed, run fsck ASAP");
718 return 0;
719}
720
721static void errcatch_print_vi(struct virtual_item *vi)
722{
723 reiserfs_warning(NULL, "green-16011",
724 "Invalid item type observed, run fsck ASAP");
725}
726
727static struct item_operations errcatch_ops = {
728 errcatch_bytes_number,
729 errcatch_decrement_key,
730 errcatch_is_left_mergeable,
731 errcatch_print_item,
732 errcatch_check_item,
733
734 errcatch_create_vi,
735 errcatch_check_left,
736 errcatch_check_right,
737 errcatch_part_size,
738 errcatch_unit_num,
739 errcatch_print_vi
740};
741
742//////////////////////////////////////////////////////////////////////////////
743//
744//
745#if ! (TYPE_STAT_DATA == 0 && TYPE_INDIRECT == 1 && TYPE_DIRECT == 2 && TYPE_DIRENTRY == 3)
746#error Item types must use disk-format assigned values.
747#endif
748
749struct item_operations *item_ops[TYPE_ANY + 1] = {
750 &stat_data_ops,
751 &indirect_ops,
752 &direct_ops,
753 &direntry_ops,
754 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
755 &errcatch_ops /* This is to catch errors with invalid type (15th entry for TYPE_ANY) */
756};