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