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