module: use krealloc
[linux-2.6.git] / fs / reiserfs / procfs.c
1 /* -*- linux-c -*- */
2
3 /* fs/reiserfs/procfs.c */
4
5 /*
6  * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
7  */
8
9 /* proc info support a la one created by Sizif@Botik.RU for PGC */
10
11 /* $Id: procfs.c,v 1.1.8.2 2001/07/15 17:08:42 god Exp $ */
12
13 #include <linux/module.h>
14 #include <linux/time.h>
15 #include <linux/seq_file.h>
16 #include <asm/uaccess.h>
17 #include <linux/reiserfs_fs.h>
18 #include <linux/reiserfs_fs_sb.h>
19 #include <linux/smp_lock.h>
20 #include <linux/init.h>
21 #include <linux/proc_fs.h>
22
23 #if defined( REISERFS_PROC_INFO )
24
25 /*
26  * LOCKING:
27  *
28  * We rely on new Alexander Viro's super-block locking.
29  *
30  */
31
32 static int show_version(struct seq_file *m, struct super_block *sb)
33 {
34         char *format;
35
36         if (REISERFS_SB(sb)->s_properties & (1 << REISERFS_3_6)) {
37                 format = "3.6";
38         } else if (REISERFS_SB(sb)->s_properties & (1 << REISERFS_3_5)) {
39                 format = "3.5";
40         } else {
41                 format = "unknown";
42         }
43
44         seq_printf(m, "%s format\twith checks %s\n", format,
45 #if defined( CONFIG_REISERFS_CHECK )
46                    "on"
47 #else
48                    "off"
49 #endif
50             );
51         return 0;
52 }
53
54 int reiserfs_global_version_in_proc(char *buffer, char **start, off_t offset,
55                                     int count, int *eof, void *data)
56 {
57         *start = buffer;
58         *eof = 1;
59         return 0;
60 }
61
62 #define SF( x ) ( r -> x )
63 #define SFP( x ) SF( s_proc_info_data.x )
64 #define SFPL( x ) SFP( x[ level ] )
65 #define SFPF( x ) SFP( scan_bitmap.x )
66 #define SFPJ( x ) SFP( journal.x )
67
68 #define D2C( x ) le16_to_cpu( x )
69 #define D4C( x ) le32_to_cpu( x )
70 #define DF( x ) D2C( rs -> s_v1.x )
71 #define DFL( x ) D4C( rs -> s_v1.x )
72
73 #define objectid_map( s, rs ) (old_format_only (s) ?                            \
74                          (__le32 *)((struct reiserfs_super_block_v1 *)rs + 1) : \
75                          (__le32 *)(rs + 1))
76 #define MAP( i ) D4C( objectid_map( sb, rs )[ i ] )
77
78 #define DJF( x ) le32_to_cpu( rs -> x )
79 #define DJV( x ) le32_to_cpu( s_v1 -> x )
80 #define DJP( x ) le32_to_cpu( jp -> x )
81 #define JF( x ) ( r -> s_journal -> x )
82
83 static int show_super(struct seq_file *m, struct super_block *sb)
84 {
85         struct reiserfs_sb_info *r = REISERFS_SB(sb);
86
87         seq_printf(m, "state: \t%s\n"
88                    "mount options: \t%s%s%s%s%s%s%s%s%s%s%s\n"
89                    "gen. counter: \t%i\n"
90                    "s_disk_reads: \t%i\n"
91                    "s_disk_writes: \t%i\n"
92                    "s_fix_nodes: \t%i\n"
93                    "s_do_balance: \t%i\n"
94                    "s_unneeded_left_neighbor: \t%i\n"
95                    "s_good_search_by_key_reada: \t%i\n"
96                    "s_bmaps: \t%i\n"
97                    "s_bmaps_without_search: \t%i\n"
98                    "s_direct2indirect: \t%i\n"
99                    "s_indirect2direct: \t%i\n"
100                    "\n"
101                    "max_hash_collisions: \t%i\n"
102                    "breads: \t%lu\n"
103                    "bread_misses: \t%lu\n"
104                    "search_by_key: \t%lu\n"
105                    "search_by_key_fs_changed: \t%lu\n"
106                    "search_by_key_restarted: \t%lu\n"
107                    "insert_item_restarted: \t%lu\n"
108                    "paste_into_item_restarted: \t%lu\n"
109                    "cut_from_item_restarted: \t%lu\n"
110                    "delete_solid_item_restarted: \t%lu\n"
111                    "delete_item_restarted: \t%lu\n"
112                    "leaked_oid: \t%lu\n"
113                    "leaves_removable: \t%lu\n",
114                    SF(s_mount_state) == REISERFS_VALID_FS ?
115                    "REISERFS_VALID_FS" : "REISERFS_ERROR_FS",
116                    reiserfs_r5_hash(sb) ? "FORCE_R5 " : "",
117                    reiserfs_rupasov_hash(sb) ? "FORCE_RUPASOV " : "",
118                    reiserfs_tea_hash(sb) ? "FORCE_TEA " : "",
119                    reiserfs_hash_detect(sb) ? "DETECT_HASH " : "",
120                    reiserfs_no_border(sb) ? "NO_BORDER " : "BORDER ",
121                    reiserfs_no_unhashed_relocation(sb) ?
122                    "NO_UNHASHED_RELOCATION " : "",
123                    reiserfs_hashed_relocation(sb) ? "UNHASHED_RELOCATION " : "",
124                    reiserfs_test4(sb) ? "TEST4 " : "",
125                    have_large_tails(sb) ? "TAILS " : have_small_tails(sb) ?
126                    "SMALL_TAILS " : "NO_TAILS ",
127                    replay_only(sb) ? "REPLAY_ONLY " : "",
128                    convert_reiserfs(sb) ? "CONV " : "",
129                    atomic_read(&r->s_generation_counter),
130                    SF(s_disk_reads), SF(s_disk_writes), SF(s_fix_nodes),
131                    SF(s_do_balance), SF(s_unneeded_left_neighbor),
132                    SF(s_good_search_by_key_reada), SF(s_bmaps),
133                    SF(s_bmaps_without_search), SF(s_direct2indirect),
134                    SF(s_indirect2direct), SFP(max_hash_collisions), SFP(breads),
135                    SFP(bread_miss), SFP(search_by_key),
136                    SFP(search_by_key_fs_changed), SFP(search_by_key_restarted),
137                    SFP(insert_item_restarted), SFP(paste_into_item_restarted),
138                    SFP(cut_from_item_restarted),
139                    SFP(delete_solid_item_restarted), SFP(delete_item_restarted),
140                    SFP(leaked_oid), SFP(leaves_removable));
141
142         return 0;
143 }
144
145 static int show_per_level(struct seq_file *m, struct super_block *sb)
146 {
147         struct reiserfs_sb_info *r = REISERFS_SB(sb);
148         int level;
149
150         seq_printf(m, "level\t"
151                    "     balances"
152                    " [sbk:  reads"
153                    "   fs_changed"
154                    "   restarted]"
155                    "   free space"
156                    "        items"
157                    "   can_remove"
158                    "         lnum"
159                    "         rnum"
160                    "       lbytes"
161                    "       rbytes"
162                    "     get_neig"
163                    " get_neig_res" "  need_l_neig" "  need_r_neig" "\n");
164
165         for (level = 0; level < MAX_HEIGHT; ++level) {
166                 seq_printf(m, "%i\t"
167                            " %12lu"
168                            " %12lu"
169                            " %12lu"
170                            " %12lu"
171                            " %12lu"
172                            " %12lu"
173                            " %12lu"
174                            " %12li"
175                            " %12li"
176                            " %12li"
177                            " %12li"
178                            " %12lu"
179                            " %12lu"
180                            " %12lu"
181                            " %12lu"
182                            "\n",
183                            level,
184                            SFPL(balance_at),
185                            SFPL(sbk_read_at),
186                            SFPL(sbk_fs_changed),
187                            SFPL(sbk_restarted),
188                            SFPL(free_at),
189                            SFPL(items_at),
190                            SFPL(can_node_be_removed),
191                            SFPL(lnum),
192                            SFPL(rnum),
193                            SFPL(lbytes),
194                            SFPL(rbytes),
195                            SFPL(get_neighbors),
196                            SFPL(get_neighbors_restart),
197                            SFPL(need_l_neighbor), SFPL(need_r_neighbor)
198                     );
199         }
200         return 0;
201 }
202
203 static int show_bitmap(struct seq_file *m, struct super_block *sb)
204 {
205         struct reiserfs_sb_info *r = REISERFS_SB(sb);
206
207         seq_printf(m, "free_block: %lu\n"
208                    "  scan_bitmap:"
209                    "          wait"
210                    "          bmap"
211                    "         retry"
212                    "        stolen"
213                    "  journal_hint"
214                    "journal_nohint"
215                    "\n"
216                    " %14lu"
217                    " %14lu"
218                    " %14lu"
219                    " %14lu"
220                    " %14lu"
221                    " %14lu"
222                    " %14lu"
223                    "\n",
224                    SFP(free_block),
225                    SFPF(call),
226                    SFPF(wait),
227                    SFPF(bmap),
228                    SFPF(retry),
229                    SFPF(stolen),
230                    SFPF(in_journal_hint), SFPF(in_journal_nohint));
231
232         return 0;
233 }
234
235 static int show_on_disk_super(struct seq_file *m, struct super_block *sb)
236 {
237         struct reiserfs_sb_info *sb_info = REISERFS_SB(sb);
238         struct reiserfs_super_block *rs = sb_info->s_rs;
239         int hash_code = DFL(s_hash_function_code);
240         __u32 flags = DJF(s_flags);
241
242         seq_printf(m, "block_count: \t%i\n"
243                    "free_blocks: \t%i\n"
244                    "root_block: \t%i\n"
245                    "blocksize: \t%i\n"
246                    "oid_maxsize: \t%i\n"
247                    "oid_cursize: \t%i\n"
248                    "umount_state: \t%i\n"
249                    "magic: \t%10.10s\n"
250                    "fs_state: \t%i\n"
251                    "hash: \t%s\n"
252                    "tree_height: \t%i\n"
253                    "bmap_nr: \t%i\n"
254                    "version: \t%i\n"
255                    "flags: \t%x[%s]\n"
256                    "reserved_for_journal: \t%i\n",
257                    DFL(s_block_count),
258                    DFL(s_free_blocks),
259                    DFL(s_root_block),
260                    DF(s_blocksize),
261                    DF(s_oid_maxsize),
262                    DF(s_oid_cursize),
263                    DF(s_umount_state),
264                    rs->s_v1.s_magic,
265                    DF(s_fs_state),
266                    hash_code == TEA_HASH ? "tea" :
267                    (hash_code == YURA_HASH) ? "rupasov" :
268                    (hash_code == R5_HASH) ? "r5" :
269                    (hash_code == UNSET_HASH) ? "unset" : "unknown",
270                    DF(s_tree_height),
271                    DF(s_bmap_nr),
272                    DF(s_version), flags, (flags & reiserfs_attrs_cleared)
273                    ? "attrs_cleared" : "", DF(s_reserved_for_journal));
274
275         return 0;
276 }
277
278 static int show_oidmap(struct seq_file *m, struct super_block *sb)
279 {
280         struct reiserfs_sb_info *sb_info = REISERFS_SB(sb);
281         struct reiserfs_super_block *rs = sb_info->s_rs;
282         unsigned int mapsize = le16_to_cpu(rs->s_v1.s_oid_cursize);
283         unsigned long total_used = 0;
284         int i;
285
286         for (i = 0; i < mapsize; ++i) {
287                 __u32 right;
288
289                 right = (i == mapsize - 1) ? MAX_KEY_OBJECTID : MAP(i + 1);
290                 seq_printf(m, "%s: [ %x .. %x )\n",
291                            (i & 1) ? "free" : "used", MAP(i), right);
292                 if (!(i & 1)) {
293                         total_used += right - MAP(i);
294                 }
295         }
296 #if defined( REISERFS_USE_OIDMAPF )
297         if (sb_info->oidmap.use_file && (sb_info->oidmap.mapf != NULL)) {
298                 loff_t size = sb_info->oidmap.mapf->f_path.dentry->d_inode->i_size;
299                 total_used += size / sizeof(reiserfs_oidinterval_d_t);
300         }
301 #endif
302         seq_printf(m, "total: \t%i [%i/%i] used: %lu [exact]\n",
303                    mapsize,
304                    mapsize, le16_to_cpu(rs->s_v1.s_oid_maxsize), total_used);
305         return 0;
306 }
307
308 static int show_journal(struct seq_file *m, struct super_block *sb)
309 {
310         struct reiserfs_sb_info *r = REISERFS_SB(sb);
311         struct reiserfs_super_block *rs = r->s_rs;
312         struct journal_params *jp = &rs->s_v1.s_journal;
313         char b[BDEVNAME_SIZE];
314
315         seq_printf(m,           /* on-disk fields */
316                    "jp_journal_1st_block: \t%i\n"
317                    "jp_journal_dev: \t%s[%x]\n"
318                    "jp_journal_size: \t%i\n"
319                    "jp_journal_trans_max: \t%i\n"
320                    "jp_journal_magic: \t%i\n"
321                    "jp_journal_max_batch: \t%i\n"
322                    "jp_journal_max_commit_age: \t%i\n"
323                    "jp_journal_max_trans_age: \t%i\n"
324                    /* incore fields */
325                    "j_1st_reserved_block: \t%i\n"
326                    "j_state: \t%li\n"
327                    "j_trans_id: \t%lu\n"
328                    "j_mount_id: \t%lu\n"
329                    "j_start: \t%lu\n"
330                    "j_len: \t%lu\n"
331                    "j_len_alloc: \t%lu\n"
332                    "j_wcount: \t%i\n"
333                    "j_bcount: \t%lu\n"
334                    "j_first_unflushed_offset: \t%lu\n"
335                    "j_last_flush_trans_id: \t%lu\n"
336                    "j_trans_start_time: \t%li\n"
337                    "j_list_bitmap_index: \t%i\n"
338                    "j_must_wait: \t%i\n"
339                    "j_next_full_flush: \t%i\n"
340                    "j_next_async_flush: \t%i\n"
341                    "j_cnode_used: \t%i\n" "j_cnode_free: \t%i\n" "\n"
342                    /* reiserfs_proc_info_data_t.journal fields */
343                    "in_journal: \t%12lu\n"
344                    "in_journal_bitmap: \t%12lu\n"
345                    "in_journal_reusable: \t%12lu\n"
346                    "lock_journal: \t%12lu\n"
347                    "lock_journal_wait: \t%12lu\n"
348                    "journal_begin: \t%12lu\n"
349                    "journal_relock_writers: \t%12lu\n"
350                    "journal_relock_wcount: \t%12lu\n"
351                    "mark_dirty: \t%12lu\n"
352                    "mark_dirty_already: \t%12lu\n"
353                    "mark_dirty_notjournal: \t%12lu\n"
354                    "restore_prepared: \t%12lu\n"
355                    "prepare: \t%12lu\n"
356                    "prepare_retry: \t%12lu\n",
357                    DJP(jp_journal_1st_block),
358                    bdevname(SB_JOURNAL(sb)->j_dev_bd, b),
359                    DJP(jp_journal_dev),
360                    DJP(jp_journal_size),
361                    DJP(jp_journal_trans_max),
362                    DJP(jp_journal_magic),
363                    DJP(jp_journal_max_batch),
364                    SB_JOURNAL(sb)->j_max_commit_age,
365                    DJP(jp_journal_max_trans_age),
366                    JF(j_1st_reserved_block),
367                    JF(j_state),
368                    JF(j_trans_id),
369                    JF(j_mount_id),
370                    JF(j_start),
371                    JF(j_len),
372                    JF(j_len_alloc),
373                    atomic_read(&r->s_journal->j_wcount),
374                    JF(j_bcount),
375                    JF(j_first_unflushed_offset),
376                    JF(j_last_flush_trans_id),
377                    JF(j_trans_start_time),
378                    JF(j_list_bitmap_index),
379                    JF(j_must_wait),
380                    JF(j_next_full_flush),
381                    JF(j_next_async_flush),
382                    JF(j_cnode_used),
383                    JF(j_cnode_free),
384                    SFPJ(in_journal),
385                    SFPJ(in_journal_bitmap),
386                    SFPJ(in_journal_reusable),
387                    SFPJ(lock_journal),
388                    SFPJ(lock_journal_wait),
389                    SFPJ(journal_being),
390                    SFPJ(journal_relock_writers),
391                    SFPJ(journal_relock_wcount),
392                    SFPJ(mark_dirty),
393                    SFPJ(mark_dirty_already),
394                    SFPJ(mark_dirty_notjournal),
395                    SFPJ(restore_prepared), SFPJ(prepare), SFPJ(prepare_retry)
396             );
397         return 0;
398 }
399
400 /* iterator */
401 static int test_sb(struct super_block *sb, void *data)
402 {
403         return data == sb;
404 }
405
406 static int set_sb(struct super_block *sb, void *data)
407 {
408         return -ENOENT;
409 }
410
411 static void *r_start(struct seq_file *m, loff_t * pos)
412 {
413         struct proc_dir_entry *de = m->private;
414         struct super_block *s = de->parent->data;
415         loff_t l = *pos;
416
417         if (l)
418                 return NULL;
419
420         if (IS_ERR(sget(&reiserfs_fs_type, test_sb, set_sb, s)))
421                 return NULL;
422
423         up_write(&s->s_umount);
424
425         if (de->deleted) {
426                 deactivate_super(s);
427                 return NULL;
428         }
429
430         return s;
431 }
432
433 static void *r_next(struct seq_file *m, void *v, loff_t * pos)
434 {
435         ++*pos;
436         if (v)
437                 deactivate_super(v);
438         return NULL;
439 }
440
441 static void r_stop(struct seq_file *m, void *v)
442 {
443         if (v)
444                 deactivate_super(v);
445 }
446
447 static int r_show(struct seq_file *m, void *v)
448 {
449         struct proc_dir_entry *de = m->private;
450         int (*show) (struct seq_file *, struct super_block *) = de->data;
451         return show(m, v);
452 }
453
454 static struct seq_operations r_ops = {
455         .start = r_start,
456         .next = r_next,
457         .stop = r_stop,
458         .show = r_show,
459 };
460
461 static int r_open(struct inode *inode, struct file *file)
462 {
463         int ret = seq_open(file, &r_ops);
464
465         if (!ret) {
466                 struct seq_file *m = file->private_data;
467                 m->private = PDE(inode);
468         }
469         return ret;
470 }
471
472 static const struct file_operations r_file_operations = {
473         .open = r_open,
474         .read = seq_read,
475         .llseek = seq_lseek,
476         .release = seq_release,
477 };
478
479 static struct proc_dir_entry *proc_info_root = NULL;
480 static const char proc_info_root_name[] = "fs/reiserfs";
481
482 static void add_file(struct super_block *sb, char *name,
483                      int (*func) (struct seq_file *, struct super_block *))
484 {
485         struct proc_dir_entry *de;
486         de = create_proc_entry(name, 0, REISERFS_SB(sb)->procdir);
487         if (de) {
488                 de->data = func;
489                 de->proc_fops = &r_file_operations;
490         }
491 }
492
493 int reiserfs_proc_info_init(struct super_block *sb)
494 {
495         char b[BDEVNAME_SIZE];
496         char *s;
497
498         /* Some block devices use /'s */
499         strlcpy(b, reiserfs_bdevname(sb), BDEVNAME_SIZE);
500         s = strchr(b, '/');
501         if (s)
502                 *s = '!';
503
504         spin_lock_init(&__PINFO(sb).lock);
505         REISERFS_SB(sb)->procdir = proc_mkdir(b, proc_info_root);
506         if (REISERFS_SB(sb)->procdir) {
507                 REISERFS_SB(sb)->procdir->owner = THIS_MODULE;
508                 REISERFS_SB(sb)->procdir->data = sb;
509                 add_file(sb, "version", show_version);
510                 add_file(sb, "super", show_super);
511                 add_file(sb, "per-level", show_per_level);
512                 add_file(sb, "bitmap", show_bitmap);
513                 add_file(sb, "on-disk-super", show_on_disk_super);
514                 add_file(sb, "oidmap", show_oidmap);
515                 add_file(sb, "journal", show_journal);
516                 return 0;
517         }
518         reiserfs_warning(sb, "reiserfs: cannot create /proc/%s/%s",
519                          proc_info_root_name, b);
520         return 1;
521 }
522
523 int reiserfs_proc_info_done(struct super_block *sb)
524 {
525         struct proc_dir_entry *de = REISERFS_SB(sb)->procdir;
526         char b[BDEVNAME_SIZE];
527         char *s;
528
529         /* Some block devices use /'s */
530         strlcpy(b, reiserfs_bdevname(sb), BDEVNAME_SIZE);
531         s = strchr(b, '/');
532         if (s)
533                 *s = '!';
534
535         if (de) {
536                 remove_proc_entry("journal", de);
537                 remove_proc_entry("oidmap", de);
538                 remove_proc_entry("on-disk-super", de);
539                 remove_proc_entry("bitmap", de);
540                 remove_proc_entry("per-level", de);
541                 remove_proc_entry("super", de);
542                 remove_proc_entry("version", de);
543         }
544         spin_lock(&__PINFO(sb).lock);
545         __PINFO(sb).exiting = 1;
546         spin_unlock(&__PINFO(sb).lock);
547         if (proc_info_root) {
548                 remove_proc_entry(b, proc_info_root);
549                 REISERFS_SB(sb)->procdir = NULL;
550         }
551         return 0;
552 }
553
554 struct proc_dir_entry *reiserfs_proc_register_global(char *name,
555                                                      read_proc_t * func)
556 {
557         return (proc_info_root) ? create_proc_read_entry(name, 0,
558                                                          proc_info_root,
559                                                          func, NULL) : NULL;
560 }
561
562 void reiserfs_proc_unregister_global(const char *name)
563 {
564         remove_proc_entry(name, proc_info_root);
565 }
566
567 int reiserfs_proc_info_global_init(void)
568 {
569         if (proc_info_root == NULL) {
570                 proc_info_root = proc_mkdir(proc_info_root_name, NULL);
571                 if (proc_info_root) {
572                         proc_info_root->owner = THIS_MODULE;
573                 } else {
574                         reiserfs_warning(NULL,
575                                          "reiserfs: cannot create /proc/%s",
576                                          proc_info_root_name);
577                         return 1;
578                 }
579         }
580         return 0;
581 }
582
583 int reiserfs_proc_info_global_done(void)
584 {
585         if (proc_info_root != NULL) {
586                 proc_info_root = NULL;
587                 remove_proc_entry(proc_info_root_name, NULL);
588         }
589         return 0;
590 }
591
592 /* REISERFS_PROC_INFO */
593 #else
594
595 int reiserfs_proc_info_init(struct super_block *sb)
596 {
597         return 0;
598 }
599 int reiserfs_proc_info_done(struct super_block *sb)
600 {
601         return 0;
602 }
603
604 struct proc_dir_entry *reiserfs_proc_register_global(char *name,
605                                                      read_proc_t * func)
606 {
607         return NULL;
608 }
609
610 void reiserfs_proc_unregister_global(const char *name)
611 {;
612 }
613
614 int reiserfs_proc_info_global_init(void)
615 {
616         return 0;
617 }
618 int reiserfs_proc_info_global_done(void)
619 {
620         return 0;
621 }
622
623 int reiserfs_global_version_in_proc(char *buffer, char **start,
624                                     off_t offset,
625                                     int count, int *eof, void *data)
626 {
627         return 0;
628 }
629
630 /* REISERFS_PROC_INFO */
631 #endif
632
633 /*
634  * $Log: procfs.c,v $
635  * Revision 1.1.8.2  2001/07/15 17:08:42  god
636  *  . use get_super() in procfs.c
637  *  . remove remove_save_link() from reiserfs_do_truncate()
638  *
639  * I accept terms and conditions stated in the Legal Agreement
640  * (available at http://www.namesys.com/legalese.html)
641  *
642  * Revision 1.1.8.1  2001/07/11 16:48:50  god
643  * proc info support
644  *
645  * I accept terms and conditions stated in the Legal Agreement
646  * (available at http://www.namesys.com/legalese.html)
647  *
648  */
649
650 /* 
651  * Make Linus happy.
652  * Local variables:
653  * c-indentation-style: "K&R"
654  * mode-name: "LC"
655  * c-basic-offset: 8
656  * tab-width: 8
657  * End:
658  */