fs/jfs/super.c

   1 /*
   2  *   Copyright (C) International Business Machines Corp., 2000-2003
   3  *   Portions Copyright (C) Christoph Hellwig, 2001-2002
   4  *
   5  *   This program is free software;  you can redistribute it and/or modify
   6  *   it under the terms of the GNU General Public License as published by
   7  *   the Free Software Foundation; either version 2 of the License, or
   8  *   (at your option) any later version.
   9  *
  10  *   This program is distributed in the hope that it will be useful,
  11  *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  13  *   the GNU General Public License for more details.
  14  *
  15  *   You should have received a copy of the GNU General Public License
  16  *   along with this program;  if not, write to the Free Software
  17  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  18  */
  19
  20 #include <linux/fs.h>
  21 #include <linux/config.h>
  22 #include <linux/module.h>
  23 #include <linux/parser.h>
  24 #include <linux/completion.h>
  25 #include <linux/vfs.h>
  26 #include <asm/uaccess.h>
  27
  28 #include "jfs_incore.h"
  29 #include "jfs_filsys.h"
  30 #include "jfs_metapage.h"
  31 #include "jfs_superblock.h"
  32 #include "jfs_dmap.h"
  33 #include "jfs_imap.h"
  34 #include "jfs_acl.h"
  35 #include "jfs_debug.h"
  36
  37 MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
  38 MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
  39 MODULE_LICENSE("GPL");
  40
  41 static kmem_cache_t * jfs_inode_cachep;
  42
  43 static struct super_operations jfs_super_operations;
  44 static struct export_operations jfs_export_operations;
  45 static struct file_system_type jfs_fs_type;
  46
  47 int jfs_stop_threads;
  48 static pid_t jfsIOthread;
  49 static pid_t jfsCommitThread;
  50 static pid_t jfsSyncThread;
  51 DECLARE_COMPLETION(jfsIOwait);
  52
  53 #ifdef CONFIG_JFS_DEBUG
  54 int jfsloglevel = JFS_LOGLEVEL_WARN;
  55 MODULE_PARM(jfsloglevel, "i");
  56 MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
  57 #endif
  58
  59 /*
  60  * External declarations
  61  */
  62 extern int jfs_mount(struct super_block *);
  63 extern int jfs_mount_rw(struct super_block *, int);
  64 extern int jfs_umount(struct super_block *);
  65 extern int jfs_umount_rw(struct super_block *);
  66
  67 extern int jfsIOWait(void *);
  68 extern int jfs_lazycommit(void *);
  69 extern int jfs_sync(void *);
  70
  71 extern void jfs_read_inode(struct inode *inode);
  72 extern void jfs_dirty_inode(struct inode *inode);
  73 extern void jfs_delete_inode(struct inode *inode);
  74 extern void jfs_write_inode(struct inode *inode, int wait);
  75
  76 extern struct dentry *jfs_get_parent(struct dentry *dentry);
  77 extern int jfs_extendfs(struct super_block *, s64, int);
  78
  79 #ifdef PROC_FS_JFS              /* see jfs_debug.h */
  80 extern void jfs_proc_init(void);
  81 extern void jfs_proc_clean(void);
  82 #endif
  83
  84 extern wait_queue_head_t jfs_IO_thread_wait;
  85 extern wait_queue_head_t jfs_commit_thread_wait;
  86 extern wait_queue_head_t jfs_sync_thread_wait;
  87
  88 static void jfs_handle_error(struct super_block *sb)
  89 {
  90         struct jfs_sb_info *sbi = JFS_SBI(sb);
  91
  92         if (sb->s_flags & MS_RDONLY)
  93                 return;
  94
  95         updateSuper(sb, FM_DIRTY);
  96
  97         if (sbi->flag & JFS_ERR_PANIC)
  98                 panic("JFS (device %s): panic forced after error\n",
  99                         sb->s_id);
 100         else if (sbi->flag & JFS_ERR_REMOUNT_RO) {
 101                 jfs_err("ERROR: (device %s): remounting filesystem "
 102                         "as read-only\n",
 103                         sb->s_id);
 104                 sb->s_flags |= MS_RDONLY;
 105         }
 106
 107         /* nothing is done for continue beyond marking the superblock dirty */
 108 }
 109
 110 void jfs_error(struct super_block *sb, const char * function, ...)
 111 {
 112         static char error_buf[256];
 113         va_list args;
 114
 115         va_start(args, function);
 116         vsprintf(error_buf, function, args);
 117         va_end(args);
 118
 119         printk(KERN_ERR "ERROR: (device %s): %s\n", sb->s_id, error_buf);
 120
 121         jfs_handle_error(sb);
 122 }
 123
 124 static struct inode *jfs_alloc_inode(struct super_block *sb)
 125 {
 126         struct jfs_inode_info *jfs_inode;
 127
 128         jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS);
 129         if (!jfs_inode)
 130                 return NULL;
 131         return &jfs_inode->vfs_inode;
 132 }
 133
 134 static void jfs_destroy_inode(struct inode *inode)
 135 {
 136         struct jfs_inode_info *ji = JFS_IP(inode);
 137
 138         if (ji->active_ag != -1) {
 139                 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
 140                 atomic_dec(&bmap->db_active[ji->active_ag]);
 141         }
 142
 143 #ifdef CONFIG_JFS_POSIX_ACL
 144         if (ji->i_acl != JFS_ACL_NOT_CACHED) {
 145                 posix_acl_release(ji->i_acl);
 146                 ji->i_acl = JFS_ACL_NOT_CACHED;
 147         }
 148         if (ji->i_default_acl != JFS_ACL_NOT_CACHED) {
 149                 posix_acl_release(ji->i_default_acl);
 150                 ji->i_default_acl = JFS_ACL_NOT_CACHED;
 151         }
 152 #endif
 153
 154         kmem_cache_free(jfs_inode_cachep, ji);
 155 }
 156
 157 static int jfs_statfs(struct super_block *sb, struct kstatfs *buf)
 158 {
 159         struct jfs_sb_info *sbi = JFS_SBI(sb);
 160         s64 maxinodes;
 161         struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
 162
 163         jfs_info("In jfs_statfs");
 164         buf->f_type = JFS_SUPER_MAGIC;
 165         buf->f_bsize = sbi->bsize;
 166         buf->f_blocks = sbi->bmap->db_mapsize;
 167         buf->f_bfree = sbi->bmap->db_nfree;
 168         buf->f_bavail = sbi->bmap->db_nfree;
 169         /*
 170          * If we really return the number of allocated & free inodes, some
 171          * applications will fail because they won't see enough free inodes.
 172          * We'll try to calculate some guess as to how may inodes we can
 173          * really allocate
 174          *
 175          * buf->f_files = atomic_read(&imap->im_numinos);
 176          * buf->f_ffree = atomic_read(&imap->im_numfree);
 177          */
 178         maxinodes = min((s64) atomic_read(&imap->im_numinos) +
 179                         ((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
 180                          << L2INOSPEREXT), (s64) 0xffffffffLL);
 181         buf->f_files = maxinodes;
 182         buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
 183                                     atomic_read(&imap->im_numfree));
 184
 185         buf->f_namelen = JFS_NAME_MAX;
 186         return 0;
 187 }
 188
 189 static void jfs_put_super(struct super_block *sb)
 190 {
 191         struct jfs_sb_info *sbi = JFS_SBI(sb);
 192         int rc;
 193
 194         jfs_info("In jfs_put_super");
 195         rc = jfs_umount(sb);
 196         if (rc)
 197                 jfs_err("jfs_umount failed with return code %d", rc);
 198         unload_nls(sbi->nls_tab);
 199         sbi->nls_tab = NULL;
 200
 201         kfree(sbi);
 202 }
 203
 204 enum {
 205         Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
 206         Opt_errors, Opt_ignore, Opt_err,
 207 };
 208
 209 static match_table_t tokens = {
 210         {Opt_integrity, "integrity"},
 211         {Opt_nointegrity, "nointegrity"},
 212         {Opt_iocharset, "iocharset=%s"},
 213         {Opt_resize, "resize=%u"},
 214         {Opt_errors, "errors=%s"},
 215         {Opt_ignore, "noquota"},
 216         {Opt_ignore, "quota"},
 217         {Opt_ignore, "usrquota"},
 218         {Opt_ignore, "grpquota"},
 219         {Opt_err, NULL}
 220 };
 221
 222 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
 223                          int *flag)
 224 {
 225         void *nls_map = NULL;
 226         char *p;
 227         struct jfs_sb_info *sbi = JFS_SBI(sb);
 228
 229         *newLVSize = 0;
 230
 231         if (!options)
 232                 return 1;
 233
 234         while ((p = strsep(&options, ",")) != NULL) {
 235                 substring_t args[MAX_OPT_ARGS];
 236                 int token;
 237                 if (!*p)
 238                         continue;
 239
 240                 token = match_token(p, tokens, args);
 241                 switch (token) {
 242                 case Opt_integrity:
 243                         *flag &= ~JFS_NOINTEGRITY;
 244                         break;
 245                 case Opt_nointegrity:
 246                         *flag |= JFS_NOINTEGRITY;
 247                         break;
 248                 case Opt_ignore:
 249                         /* Silently ignore the quota options */
 250                         /* Don't do anything ;-) */
 251                         break;
 252                 case Opt_iocharset:
 253                         if (nls_map)    /* specified iocharset twice! */
 254                                 unload_nls(nls_map);
 255                         nls_map = load_nls(args[0].from);
 256                         if (!nls_map) {
 257                                 printk(KERN_ERR "JFS: charset not found\n");
 258                                 goto cleanup;
 259                         }
 260                         break;
 261                 case Opt_resize:
 262                 {
 263                         char *resize = args[0].from;
 264                         if (!resize || !*resize) {
 265                                 *newLVSize = sb->s_bdev->bd_inode->i_size >>
 266                                         sb->s_blocksize_bits;
 267                                 if (*newLVSize == 0)
 268                                         printk(KERN_ERR
 269                                         "JFS: Cannot determine volume size\n");
 270                         } else
 271                                 *newLVSize = simple_strtoull(resize, &resize, 0);
 272                         break;
 273                 }
 274                 case Opt_errors:
 275                 {
 276                         char *errors = args[0].from;
 277                         if (!errors || !*errors)
 278                                 goto cleanup;
 279                         if (!strcmp(errors, "continue")) {
 280                                 *flag &= ~JFS_ERR_REMOUNT_RO;
 281                                 *flag &= ~JFS_ERR_PANIC;
 282                                 *flag |= JFS_ERR_CONTINUE;
 283                         } else if (!strcmp(errors, "remount-ro")) {
 284                                 *flag &= ~JFS_ERR_CONTINUE;
 285                                 *flag &= ~JFS_ERR_PANIC;
 286                                 *flag |= JFS_ERR_REMOUNT_RO;
 287                         } else if (!strcmp(errors, "panic")) {
 288                                 *flag &= ~JFS_ERR_CONTINUE;
 289                                 *flag &= ~JFS_ERR_REMOUNT_RO;
 290                                 *flag |= JFS_ERR_PANIC;
 291                         } else {
 292                                 printk(KERN_ERR
 293                                        "JFS: %s is an invalid error handler\n",
 294                                        errors);
 295                                 goto cleanup;
 296                         }
 297                         break;
 298                 }
 299                 default:
 300                         printk("jfs: Unrecognized mount option \"%s\" "
 301                                         " or missing value\n", p);
 302                         goto cleanup;
 303                 }
 304         }
 305
 306         if (nls_map) {
 307                 /* Discard old (if remount) */
 308                 if (sbi->nls_tab)
 309                         unload_nls(sbi->nls_tab);
 310                 sbi->nls_tab = nls_map;
 311         }
 312         return 1;
 313
 314 cleanup:
 315         if (nls_map)
 316                 unload_nls(nls_map);
 317         return 0;
 318 }
 319
 320 int jfs_remount(struct super_block *sb, int *flags, char *data)
 321 {
 322         s64 newLVSize = 0;
 323         int rc = 0;
 324         int flag = JFS_SBI(sb)->flag;
 325
 326         if (!parse_options(data, sb, &newLVSize, &flag)) {
 327                 return -EINVAL;
 328         }
 329         if (newLVSize) {
 330                 if (sb->s_flags & MS_RDONLY) {
 331                         printk(KERN_ERR
 332                   "JFS: resize requires volume to be mounted read-write\n");
 333                         return -EROFS;
 334                 }
 335                 rc = jfs_extendfs(sb, newLVSize, 0);
 336                 if (rc)
 337                         return rc;
 338         }
 339
 340         if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
 341                 JFS_SBI(sb)->flag = flag;
 342                 return jfs_mount_rw(sb, 1);
 343         }
 344         if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
 345                 rc = jfs_umount_rw(sb);
 346                 JFS_SBI(sb)->flag = flag;
 347                 return rc;
 348         }
 349         if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
 350                 if (!(sb->s_flags & MS_RDONLY)) {
 351                         rc = jfs_umount_rw(sb);
 352                         if (rc)
 353                                 return rc;
 354                         JFS_SBI(sb)->flag = flag;
 355                         return jfs_mount_rw(sb, 1);
 356                 }
 357         JFS_SBI(sb)->flag = flag;
 358
 359         return 0;
 360 }
 361
 362 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
 363 {
 364         struct jfs_sb_info *sbi;
 365         struct inode *inode;
 366         int rc;
 367         s64 newLVSize = 0;
 368         int flag;
 369
 370         jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
 371
 372         if (!new_valid_dev(sb->s_bdev->bd_dev))
 373                 return -EOVERFLOW;
 374
 375         sbi = kmalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
 376         if (!sbi)
 377                 return -ENOSPC;
 378         memset(sbi, 0, sizeof (struct jfs_sb_info));
 379         sb->s_fs_info = sbi;
 380
 381         /* initialize the mount flag and determine the default error handler */
 382         flag = JFS_ERR_REMOUNT_RO;
 383
 384         if (!parse_options((char *) data, sb, &newLVSize, &flag)) {
 385                 kfree(sbi);
 386                 return -EINVAL;
 387         }
 388         sbi->flag = flag;
 389
 390         if (newLVSize) {
 391                 printk(KERN_ERR "resize option for remount only\n");
 392                 return -EINVAL;
 393         }
 394
 395         /*
 396          * Initialize blocksize to 4K.
 397          */
 398         sb_set_blocksize(sb, PSIZE);
 399
 400         /*
 401          * Set method vectors.
 402          */
 403         sb->s_op = &jfs_super_operations;
 404         sb->s_export_op = &jfs_export_operations;
 405
 406         rc = jfs_mount(sb);
 407         if (rc) {
 408                 if (!silent) {
 409                         jfs_err("jfs_mount failed w/return code = %d", rc);
 410                 }
 411                 goto out_kfree;
 412         }
 413         if (sb->s_flags & MS_RDONLY)
 414                 sbi->log = 0;
 415         else {
 416                 rc = jfs_mount_rw(sb, 0);
 417                 if (rc) {
 418                         if (!silent) {
 419                                 jfs_err("jfs_mount_rw failed, return code = %d",
 420                                         rc);
 421                         }
 422                         goto out_no_rw;
 423                 }
 424         }
 425
 426         sb->s_magic = JFS_SUPER_MAGIC;
 427
 428         inode = iget(sb, ROOT_I);
 429         if (!inode || is_bad_inode(inode))
 430                 goto out_no_root;
 431         sb->s_root = d_alloc_root(inode);
 432         if (!sb->s_root)
 433                 goto out_no_root;
 434
 435         if (!sbi->nls_tab)
 436                 sbi->nls_tab = load_nls_default();
 437
 438         /* logical blocks are represented by 40 bits in pxd_t, etc. */
 439         sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
 440 #if BITS_PER_LONG == 32
 441         /*
 442          * Page cache is indexed by long.
 443          * I would use MAX_LFS_FILESIZE, but it's only half as big
 444          */
 445         sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, sb->s_maxbytes);
 446 #endif
 447
 448         return 0;
 449
 450 out_no_root:
 451         jfs_err("jfs_read_super: get root inode failed");
 452         if (inode)
 453                 iput(inode);
 454
 455 out_no_rw:
 456         rc = jfs_umount(sb);
 457         if (rc) {
 458                 jfs_err("jfs_umount failed with return code %d", rc);
 459         }
 460 out_kfree:
 461         if (sbi->nls_tab)
 462                 unload_nls(sbi->nls_tab);
 463         kfree(sbi);
 464         return -EINVAL;
 465 }
 466
 467 static void jfs_write_super_lockfs(struct super_block *sb)
 468 {
 469         struct jfs_sb_info *sbi = JFS_SBI(sb);
 470         struct jfs_log *log = sbi->log;
 471
 472         if (!(sb->s_flags & MS_RDONLY)) {
 473                 txQuiesce(sb);
 474                 lmLogShutdown(log);
 475                 updateSuper(sb, FM_CLEAN);
 476         }
 477 }
 478
 479 static void jfs_unlockfs(struct super_block *sb)
 480 {
 481         struct jfs_sb_info *sbi = JFS_SBI(sb);
 482         struct jfs_log *log = sbi->log;
 483         int rc = 0;
 484
 485         if (!(sb->s_flags & MS_RDONLY)) {
 486                 updateSuper(sb, FM_MOUNT);
 487                 if ((rc = lmLogInit(log)))
 488                         jfs_err("jfs_unlock failed with return code %d", rc);
 489                 else
 490                         txResume(sb);
 491         }
 492 }
 493
 494 static struct super_block *jfs_get_sb(struct file_system_type *fs_type,
 495         int flags, const char *dev_name, void *data)
 496 {
 497         return get_sb_bdev(fs_type, flags, dev_name, data, jfs_fill_super);
 498 }
 499
 500 static int jfs_sync_fs(struct super_block *sb, int wait)
 501 {
 502         struct jfs_log *log = JFS_SBI(sb)->log;
 503
 504         /* log == NULL indicates read-only mount */
 505         if (log)
 506                 jfs_flush_journal(log, wait);
 507
 508         return 0;
 509 }
 510
 511 static struct super_operations jfs_super_operations = {
 512         .alloc_inode    = jfs_alloc_inode,
 513         .destroy_inode  = jfs_destroy_inode,
 514         .read_inode     = jfs_read_inode,
 515         .dirty_inode    = jfs_dirty_inode,
 516         .write_inode    = jfs_write_inode,
 517         .delete_inode   = jfs_delete_inode,
 518         .put_super      = jfs_put_super,
 519         .sync_fs        = jfs_sync_fs,
 520         .write_super_lockfs = jfs_write_super_lockfs,
 521         .unlockfs       = jfs_unlockfs,
 522         .statfs         = jfs_statfs,
 523         .remount_fs     = jfs_remount,
 524 };
 525
 526 static struct export_operations jfs_export_operations = {
 527         .get_parent     = jfs_get_parent,
 528 };
 529
 530 static struct file_system_type jfs_fs_type = {
 531         .owner          = THIS_MODULE,
 532         .name           = "jfs",
 533         .get_sb         = jfs_get_sb,
 534         .kill_sb        = kill_block_super,
 535         .fs_flags       = FS_REQUIRES_DEV,
 536 };
 537
 538 extern int metapage_init(void);
 539 extern int txInit(void);
 540 extern void txExit(void);
 541 extern void metapage_exit(void);
 542
 543 static void init_once(void *foo, kmem_cache_t * cachep, unsigned long flags)
 544 {
 545         struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
 546
 547         if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
 548             SLAB_CTOR_CONSTRUCTOR) {
 549                 INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
 550                 init_rwsem(&jfs_ip->rdwrlock);
 551                 init_MUTEX(&jfs_ip->commit_sem);
 552                 init_rwsem(&jfs_ip->xattr_sem);
 553                 jfs_ip->atlhead = 0;
 554                 jfs_ip->active_ag = -1;
 555 #ifdef CONFIG_JFS_POSIX_ACL
 556                 jfs_ip->i_acl = JFS_ACL_NOT_CACHED;
 557                 jfs_ip->i_default_acl = JFS_ACL_NOT_CACHED;
 558 #endif
 559                 inode_init_once(&jfs_ip->vfs_inode);
 560         }
 561 }
 562
 563 static int __init init_jfs_fs(void)
 564 {
 565         int rc;
 566
 567         jfs_inode_cachep =
 568             kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
 569                             SLAB_RECLAIM_ACCOUNT, init_once, NULL);
 570         if (jfs_inode_cachep == NULL)
 571                 return -ENOMEM;
 572
 573         /*
 574          * Metapage initialization
 575          */
 576         rc = metapage_init();
 577         if (rc) {
 578                 jfs_err("metapage_init failed w/rc = %d", rc);
 579                 goto free_slab;
 580         }
 581
 582         /*
 583          * Transaction Manager initialization
 584          */
 585         rc = txInit();
 586         if (rc) {
 587                 jfs_err("txInit failed w/rc = %d", rc);
 588                 goto free_metapage;
 589         }
 590
 591         /*
 592          * I/O completion thread (endio)
 593          */
 594         jfsIOthread = kernel_thread(jfsIOWait, 0, CLONE_KERNEL);
 595         if (jfsIOthread < 0) {
 596                 jfs_err("init_jfs_fs: fork failed w/rc = %d", jfsIOthread);
 597                 goto end_txmngr;
 598         }
 599         wait_for_completion(&jfsIOwait);        /* Wait until thread starts */
 600
 601         jfsCommitThread = kernel_thread(jfs_lazycommit, 0, CLONE_KERNEL);
 602         if (jfsCommitThread < 0) {
 603                 jfs_err("init_jfs_fs: fork failed w/rc = %d", jfsCommitThread);
 604                 goto kill_iotask;
 605         }
 606         wait_for_completion(&jfsIOwait);        /* Wait until thread starts */
 607
 608         jfsSyncThread = kernel_thread(jfs_sync, 0, CLONE_KERNEL);
 609         if (jfsSyncThread < 0) {
 610                 jfs_err("init_jfs_fs: fork failed w/rc = %d", jfsSyncThread);
 611                 goto kill_committask;
 612         }
 613         wait_for_completion(&jfsIOwait);        /* Wait until thread starts */
 614
 615 #ifdef PROC_FS_JFS
 616         jfs_proc_init();
 617 #endif
 618
 619         return register_filesystem(&jfs_fs_type);
 620
 621 kill_committask:
 622         jfs_stop_threads = 1;
 623         wake_up(&jfs_commit_thread_wait);
 624         wait_for_completion(&jfsIOwait);        /* Wait for thread exit */
 625 kill_iotask:
 626         jfs_stop_threads = 1;
 627         wake_up(&jfs_IO_thread_wait);
 628         wait_for_completion(&jfsIOwait);        /* Wait for thread exit */
 629 end_txmngr:
 630         txExit();
 631 free_metapage:
 632         metapage_exit();
 633 free_slab:
 634         kmem_cache_destroy(jfs_inode_cachep);
 635         return rc;
 636 }
 637
 638 static void __exit exit_jfs_fs(void)
 639 {
 640         jfs_info("exit_jfs_fs called");
 641
 642         jfs_stop_threads = 1;
 643         txExit();
 644         metapage_exit();
 645         wake_up(&jfs_IO_thread_wait);
 646         wait_for_completion(&jfsIOwait);        /* Wait until IO thread exits */
 647         wake_up(&jfs_commit_thread_wait);
 648         wait_for_completion(&jfsIOwait);        /* Wait until Commit thread exits */
 649         wake_up(&jfs_sync_thread_wait);
 650         wait_for_completion(&jfsIOwait);        /* Wait until Sync thread exits */
 651 #ifdef PROC_FS_JFS
 652         jfs_proc_clean();
 653 #endif
 654         unregister_filesystem(&jfs_fs_type);
 655         kmem_cache_destroy(jfs_inode_cachep);
 656 }
 657
 658 module_init(init_jfs_fs)
 659 module_exit(exit_jfs_fs)