linux/fs/reiserfs/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 Sizif@Botik.RU 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
  26static 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
  69static 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
 131static 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
 189static 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
 221static 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
 264static 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
 294static 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 */
 387static int test_sb(struct super_block *sb, void *data)
 388{
 389        return data == sb;
 390}
 391
 392static int set_sb(struct super_block *sb, void *data)
 393{
 394        return -ENOENT;
 395}
 396
 397static 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
 413static 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
 421static void r_stop(struct seq_file *m, void *v)
 422{
 423        if (v)
 424                deactivate_super(v);
 425}
 426
 427static 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
 434static const struct seq_operations r_ops = {
 435        .start = r_start,
 436        .next = r_next,
 437        .stop = r_stop,
 438        .show = r_show,
 439};
 440
 441static 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
 452static 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
 460static struct proc_dir_entry *proc_info_root = NULL;
 461static const char proc_info_root_name[] = "fs/reiserfs";
 462
 463static 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
 470int 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
 499int 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
 530int 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
 543int 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 */
 576
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