fs/jfs/super.c

   1 /*
   2  *   Copyright (C) International Business Machines Corp., 2000-2004
   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 <linux/moduleparam.h>
  27 #include <asm/uaccess.h>
  28
  29 #include "jfs_incore.h"
  30 #include "jfs_filsys.h"
  31 #include "jfs_metapage.h"
  32 #include "jfs_superblock.h"
  33 #include "jfs_dmap.h"
  34 #include "jfs_imap.h"
  35 #include "jfs_acl.h"
  36 #include "jfs_debug.h"
  37
  38 MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
  39 MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
  40 MODULE_LICENSE("GPL");
  41
  42 static kmem_cache_t * jfs_inode_cachep;
  43
  44 static struct super_operations jfs_super_operations;
  45 static struct export_operations jfs_export_operations;
  46 static struct file_system_type jfs_fs_type;
  47
  48 #define MAX_COMMIT_THREADS 64
  49 static int commit_threads = 0;
  50 module_param(commit_threads, int, 0);
  51 MODULE_PARM_DESC(commit_threads, "Number of commit threads");
  52
  53 int jfs_stop_threads;
  54 static pid_t jfsIOthread;
  55 static pid_t jfsCommitThread[MAX_COMMIT_THREADS];
  56 static pid_t jfsSyncThread;
  57 DECLARE_COMPLETION(jfsIOwait);
  58
  59 #ifdef CONFIG_JFS_DEBUG
  60 int jfsloglevel = JFS_LOGLEVEL_WARN;
  61 module_param(jfsloglevel, int, 644);
  62 MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
  63 #endif
  64
  65 /*
  66  * External declarations
  67  */
  68 extern int jfs_mount(struct super_block *);
  69 extern int jfs_mount_rw(struct super_block *, int);
  70 extern int jfs_umount(struct super_block *);
  71 extern int jfs_umount_rw(struct super_block *);
  72
  73 extern int jfsIOWait(void *);
  74 extern int jfs_lazycommit(void *);
  75 extern int jfs_sync(void *);
  76
  77 extern void jfs_read_inode(struct inode *inode);
  78 extern void jfs_dirty_inode(struct inode *inode);
  79 extern void jfs_delete_inode(struct inode *inode);
  80 extern void jfs_write_inode(struct inode *inode, int wait);
  81
  82 extern struct dentry *jfs_get_parent(struct dentry *dentry);
  83 extern int jfs_extendfs(struct super_block *, s64, int);
  84
  85 #ifdef PROC_FS_JFS              /* see jfs_debug.h */
  86 extern void jfs_proc_init(void);
  87 extern void jfs_proc_clean(void);
  88 #endif
  89
  90 extern wait_queue_head_t jfs_IO_thread_wait;
  91 extern wait_queue_head_t jfs_commit_thread_wait;
  92 extern wait_queue_head_t jfs_sync_thread_wait;
  93
  94 static void jfs_handle_error(struct super_block *sb)
  95 {
  96         struct jfs_sb_info *sbi = JFS_SBI(sb);
  97
  98         if (sb->s_flags & MS_RDONLY)
  99                 return;
 100
 101         updateSuper(sb, FM_DIRTY);
 102
 103         if (sbi->flag & JFS_ERR_PANIC)
 104                 panic("JFS (device %s): panic forced after error\n",
 105                         sb->s_id);
 106         else if (sbi->flag & JFS_ERR_REMOUNT_RO) {
 107                 jfs_err("ERROR: (device %s): remounting filesystem "
 108                         "as read-only\n",
 109                         sb->s_id);
 110                 sb->s_flags |= MS_RDONLY;
 111         }
 112
 113         /* nothing is done for continue beyond marking the superblock dirty */
 114 }
 115
 116 void jfs_error(struct super_block *sb, const char * function, ...)
 117 {
 118         static char error_buf[256];
 119         va_list args;
 120
 121         va_start(args, function);
 122         vsprintf(error_buf, function, args);
 123         va_end(args);
 124
 125         printk(KERN_ERR "ERROR: (device %s): %s\n", sb->s_id, error_buf);
 126
 127         jfs_handle_error(sb);
 128 }
 129
 130 static struct inode *jfs_alloc_inode(struct super_block *sb)
 131 {
 132         struct jfs_inode_info *jfs_inode;
 133
 134         jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS);
 135         if (!jfs_inode)
 136                 return NULL;
 137         return &jfs_inode->vfs_inode;
 138 }
 139
 140 static void jfs_destroy_inode(struct inode *inode)
 141 {
 142         struct jfs_inode_info *ji = JFS_IP(inode);
 143
 144         if (ji->active_ag != -1) {
 145                 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
 146                 atomic_dec(&bmap->db_active[ji->active_ag]);
 147         }
 148
 149 #ifdef CONFIG_JFS_POSIX_ACL
 150         if (ji->i_acl != JFS_ACL_NOT_CACHED) {
 151                 posix_acl_release(ji->i_acl);
 152                 ji->i_acl = JFS_ACL_NOT_CACHED;
 153         }
 154         if (ji->i_default_acl != JFS_ACL_NOT_CACHED) {
 155                 posix_acl_release(ji->i_default_acl);
 156                 ji->i_default_acl = JFS_ACL_NOT_CACHED;
 157         }
 158 #endif
 159
 160         kmem_cache_free(jfs_inode_cachep, ji);
 161 }
 162
 163 static int jfs_statfs(struct super_block *sb, struct kstatfs *buf)
 164 {
 165         struct jfs_sb_info *sbi = JFS_SBI(sb);
 166         s64 maxinodes;
 167         struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
 168
 169         jfs_info("In jfs_statfs");
 170         buf->f_type = JFS_SUPER_MAGIC;
 171         buf->f_bsize = sbi->bsize;
 172         buf->f_blocks = sbi->bmap->db_mapsize;
 173         buf->f_bfree = sbi->bmap->db_nfree;
 174         buf->f_bavail = sbi->bmap->db_nfree;
 175         /*
 176          * If we really return the number of allocated & free inodes, some
 177          * applications will fail because they won't see enough free inodes.
 178          * We'll try to calculate some guess as to how may inodes we can
 179          * really allocate
 180          *
 181          * buf->f_files = atomic_read(&imap->im_numinos);
 182          * buf->f_ffree = atomic_read(&imap->im_numfree);
 183          */
 184         maxinodes = min((s64) atomic_read(&imap->im_numinos) +
 185                         ((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
 186                          << L2INOSPEREXT), (s64) 0xffffffffLL);
 187         buf->f_files = maxinodes;
 188         buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
 189                                     atomic_read(&imap->im_numfree));
 190
 191         buf->f_namelen = JFS_NAME_MAX;
 192         return 0;
 193 }
 194
 195 static void jfs_put_super(struct super_block *sb)
 196 {
 197         struct jfs_sb_info *sbi = JFS_SBI(sb);
 198         int rc;
 199
 200         jfs_info("In jfs_put_super");
 201         rc = jfs_umount(sb);
 202         if (rc)
 203                 jfs_err("jfs_umount failed with return code %d", rc);
 204         if (sbi->nls_tab)
 205                 unload_nls(sbi->nls_tab);
 206         sbi->nls_tab = NULL;
 207
 208         kfree(sbi);
 209 }
 210
 211 enum {
 212         Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
 213         Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err,
 214 };
 215
 216 static match_table_t tokens = {
 217         {Opt_integrity, "integrity"},
 218         {Opt_nointegrity, "nointegrity"},
 219         {Opt_iocharset, "iocharset=%s"},
 220         {Opt_resize, "resize=%u"},
 221         {Opt_resize_nosize, "resize"},
 222         {Opt_errors, "errors=%s"},
 223         {Opt_ignore, "noquota"},
 224         {Opt_ignore, "quota"},
 225         {Opt_ignore, "usrquota"},
 226         {Opt_ignore, "grpquota"},
 227         {Opt_err, NULL}
 228 };
 229
 230 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
 231                          int *flag)
 232 {
 233         void *nls_map = NULL;
 234         char *p;
 235         struct jfs_sb_info *sbi = JFS_SBI(sb);
 236
 237         *newLVSize = 0;
 238
 239         if (!options)
 240                 return 1;
 241
 242         while ((p = strsep(&options, ",")) != NULL) {
 243                 substring_t args[MAX_OPT_ARGS];
 244                 int token;
 245                 if (!*p)
 246                         continue;
 247
 248                 token = match_token(p, tokens, args);
 249                 switch (token) {
 250                 case Opt_integrity:
 251                         *flag &= ~JFS_NOINTEGRITY;
 252                         break;
 253                 case Opt_nointegrity:
 254                         *flag |= JFS_NOINTEGRITY;
 255                         break;
 256                 case Opt_ignore:
 257                         /* Silently ignore the quota options */
 258                         /* Don't do anything ;-) */
 259                         break;
 260                 case Opt_iocharset:
 261                         if (nls_map)    /* specified iocharset twice! */
 262                                 unload_nls(nls_map);
 263                         nls_map = load_nls(args[0].from);
 264                         if (!nls_map) {
 265                                 printk(KERN_ERR "JFS: charset not found\n");
 266                                 goto cleanup;
 267                         }
 268                         break;
 269                 case Opt_resize:
 270                 {
 271                         char *resize = args[0].from;
 272                         *newLVSize = simple_strtoull(resize, &resize, 0);
 273                         break;
 274                 }
 275                 case Opt_resize_nosize:
 276                 {
 277                         *newLVSize = sb->s_bdev->bd_inode->i_size >>
 278                                 sb->s_blocksize_bits;
 279                         if (*newLVSize == 0)
 280                                 printk(KERN_ERR
 281                                        "JFS: Cannot determine volume size\n");
 282                         break;
 283                 }
 284                 case Opt_errors:
 285                 {
 286                         char *errors = args[0].from;
 287                         if (!errors || !*errors)
 288                                 goto cleanup;
 289                         if (!strcmp(errors, "continue")) {
 290                                 *flag &= ~JFS_ERR_REMOUNT_RO;
 291                                 *flag &= ~JFS_ERR_PANIC;
 292                                 *flag |= JFS_ERR_CONTINUE;
 293                         } else if (!strcmp(errors, "remount-ro")) {
 294                                 *flag &= ~JFS_ERR_CONTINUE;
 295                                 *flag &= ~JFS_ERR_PANIC;
 296                                 *flag |= JFS_ERR_REMOUNT_RO;
 297                         } else if (!strcmp(errors, "panic")) {
 298                                 *flag &= ~JFS_ERR_CONTINUE;
 299                                 *flag &= ~JFS_ERR_REMOUNT_RO;
 300                                 *flag |= JFS_ERR_PANIC;
 301                         } else {
 302                                 printk(KERN_ERR
 303                                        "JFS: %s is an invalid error handler\n",
 304                                        errors);
 305                                 goto cleanup;
 306                         }
 307                         break;
 308                 }
 309                 default:
 310                         printk("jfs: Unrecognized mount option \"%s\" "
 311                                         " or missing value\n", p);
 312                         goto cleanup;
 313                 }
 314         }
 315
 316         if (nls_map) {
 317                 /* Discard old (if remount) */
 318                 if (sbi->nls_tab)
 319                         unload_nls(sbi->nls_tab);
 320                 sbi->nls_tab = nls_map;
 321         }
 322         return 1;
 323
 324 cleanup:
 325         if (nls_map)
 326                 unload_nls(nls_map);
 327         return 0;
 328 }
 329
 330 static int jfs_remount(struct super_block *sb, int *flags, char *data)
 331 {
 332         s64 newLVSize = 0;
 333         int rc = 0;
 334         int flag = JFS_SBI(sb)->flag;
 335
 336         if (!parse_options(data, sb, &newLVSize, &flag)) {
 337                 return -EINVAL;
 338         }
 339         if (newLVSize) {
 340                 if (sb->s_flags & MS_RDONLY) {
 341                         printk(KERN_ERR
 342                   "JFS: resize requires volume to be mounted read-write\n");
 343                         return -EROFS;
 344                 }
 345                 rc = jfs_extendfs(sb, newLVSize, 0);
 346                 if (rc)
 347                         return rc;
 348         }
 349
 350         if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
 351                 JFS_SBI(sb)->flag = flag;
 352                 return jfs_mount_rw(sb, 1);
 353         }
 354         if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
 355                 rc = jfs_umount_rw(sb);
 356                 JFS_SBI(sb)->flag = flag;
 357                 return rc;
 358         }
 359         if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
 360                 if (!(sb->s_flags & MS_RDONLY)) {
 361                         rc = jfs_umount_rw(sb);
 362                         if (rc)
 363                                 return rc;
 364                         JFS_SBI(sb)->flag = flag;
 365                         return jfs_mount_rw(sb, 1);
 366                 }
 367         JFS_SBI(sb)->flag = flag;
 368
 369         return 0;
 370 }
 371
 372 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
 373 {
 374         struct jfs_sb_info *sbi;
 375         struct inode *inode;
 376         int rc;
 377         s64 newLVSize = 0;
 378         int flag;
 379
 380         jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
 381
 382         if (!new_valid_dev(sb->s_bdev->bd_dev))
 383                 return -EOVERFLOW;
 384
 385         sbi = kmalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
 386         if (!sbi)
 387                 return -ENOSPC;
 388         memset(sbi, 0, sizeof (struct jfs_sb_info));
 389         sb->s_fs_info = sbi;
 390         sbi->sb = sb;
 391
 392         /* initialize the mount flag and determine the default error handler */
 393         flag = JFS_ERR_REMOUNT_RO;
 394
 395         if (!parse_options((char *) data, sb, &newLVSize, &flag)) {
 396                 kfree(sbi);
 397                 return -EINVAL;
 398         }
 399         sbi->flag = flag;
 400
 401         if (newLVSize) {
 402                 printk(KERN_ERR "resize option for remount only\n");
 403                 return -EINVAL;
 404         }
 405
 406         /*
 407          * Initialize blocksize to 4K.
 408          */
 409         sb_set_blocksize(sb, PSIZE);
 410
 411         /*
 412          * Set method vectors.
 413          */
 414         sb->s_op = &jfs_super_operations;
 415         sb->s_export_op = &jfs_export_operations;
 416
 417         rc = jfs_mount(sb);
 418         if (rc) {
 419                 if (!silent) {
 420                         jfs_err("jfs_mount failed w/return code = %d", rc);
 421                 }
 422                 goto out_kfree;
 423         }
 424         if (sb->s_flags & MS_RDONLY)
 425                 sbi->log = 0;
 426         else {
 427                 rc = jfs_mount_rw(sb, 0);
 428                 if (rc) {
 429                         if (!silent) {
 430                                 jfs_err("jfs_mount_rw failed, return code = %d",
 431                                         rc);
 432                         }
 433                         goto out_no_rw;
 434                 }
 435         }
 436
 437         sb->s_magic = JFS_SUPER_MAGIC;
 438
 439         inode = iget(sb, ROOT_I);
 440         if (!inode || is_bad_inode(inode))
 441                 goto out_no_root;
 442         sb->s_root = d_alloc_root(inode);
 443         if (!sb->s_root)
 444                 goto out_no_root;
 445
 446         /* logical blocks are represented by 40 bits in pxd_t, etc. */
 447         sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
 448 #if BITS_PER_LONG == 32
 449         /*
 450          * Page cache is indexed by long.
 451          * I would use MAX_LFS_FILESIZE, but it's only half as big
 452          */
 453         sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, sb->s_maxbytes);
 454 #endif
 455
 456         return 0;
 457
 458 out_no_root:
 459         jfs_err("jfs_read_super: get root inode failed");
 460         if (inode)
 461                 iput(inode);
 462
 463 out_no_rw:
 464         rc = jfs_umount(sb);
 465         if (rc) {
 466                 jfs_err("jfs_umount failed with return code %d", rc);
 467         }
 468 out_kfree:
 469         if (sbi->nls_tab)
 470                 unload_nls(sbi->nls_tab);
 471         kfree(sbi);
 472         return -EINVAL;
 473 }
 474
 475 static void jfs_write_super_lockfs(struct super_block *sb)
 476 {
 477         struct jfs_sb_info *sbi = JFS_SBI(sb);
 478         struct jfs_log *log = sbi->log;
 479
 480         if (!(sb->s_flags & MS_RDONLY)) {
 481                 txQuiesce(sb);
 482                 lmLogShutdown(log);
 483                 updateSuper(sb, FM_CLEAN);
 484         }
 485 }
 486
 487 static void jfs_unlockfs(struct super_block *sb)
 488 {
 489         struct jfs_sb_info *sbi = JFS_SBI(sb);
 490         struct jfs_log *log = sbi->log;
 491         int rc = 0;
 492
 493         if (!(sb->s_flags & MS_RDONLY)) {
 494                 updateSuper(sb, FM_MOUNT);
 495                 if ((rc = lmLogInit(log)))
 496                         jfs_err("jfs_unlock failed with return code %d", rc);
 497                 else
 498                         txResume(sb);
 499         }
 500 }
 501
 502 static struct super_block *jfs_get_sb(struct file_system_type *fs_type,
 503         int flags, const char *dev_name, void *data)
 504 {
 505         return get_sb_bdev(fs_type, flags, dev_name, data, jfs_fill_super);
 506 }
 507
 508 static int jfs_sync_fs(struct super_block *sb, int wait)
 509 {
 510         struct jfs_log *log = JFS_SBI(sb)->log;
 511
 512         /* log == NULL indicates read-only mount */
 513         if (log)
 514                 jfs_flush_journal(log, wait);
 515
 516         return 0;
 517 }
 518
 519 static struct super_operations jfs_super_operations = {
 520         .alloc_inode    = jfs_alloc_inode,
 521         .destroy_inode  = jfs_destroy_inode,
 522         .read_inode     = jfs_read_inode,
 523         .dirty_inode    = jfs_dirty_inode,
 524         .write_inode    = jfs_write_inode,
 525         .delete_inode   = jfs_delete_inode,
 526         .put_super      = jfs_put_super,
 527         .sync_fs        = jfs_sync_fs,
 528         .write_super_lockfs = jfs_write_super_lockfs,
 529         .unlockfs       = jfs_unlockfs,
 530         .statfs         = jfs_statfs,
 531         .remount_fs     = jfs_remount,
 532 };
 533
 534 static struct export_operations jfs_export_operations = {
 535         .get_parent     = jfs_get_parent,
 536 };
 537
 538 static struct file_system_type jfs_fs_type = {
 539         .owner          = THIS_MODULE,
 540         .name           = "jfs",
 541         .get_sb         = jfs_get_sb,
 542         .kill_sb        = kill_block_super,
 543         .fs_flags       = FS_REQUIRES_DEV,
 544 };
 545
 546 extern int metapage_init(void);
 547 extern int txInit(void);
 548 extern void txExit(void);
 549 extern void metapage_exit(void);
 550
 551 static void init_once(void *foo, kmem_cache_t * cachep, unsigned long flags)
 552 {
 553         struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
 554
 555         if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
 556             SLAB_CTOR_CONSTRUCTOR) {
 557                 memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
 558                 INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
 559                 init_rwsem(&jfs_ip->rdwrlock);
 560                 init_MUTEX(&jfs_ip->commit_sem);
 561                 init_rwsem(&jfs_ip->xattr_sem);
 562                 jfs_ip->active_ag = -1;
 563 #ifdef CONFIG_JFS_POSIX_ACL
 564                 jfs_ip->i_acl = JFS_ACL_NOT_CACHED;
 565                 jfs_ip->i_default_acl = JFS_ACL_NOT_CACHED;
 566 #endif
 567                 inode_init_once(&jfs_ip->vfs_inode);
 568         }
 569 }
 570
 571 static int __init init_jfs_fs(void)
 572 {
 573         int i;
 574         int rc;
 575
 576         jfs_inode_cachep =
 577             kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
 578                             SLAB_RECLAIM_ACCOUNT, init_once, NULL);
 579         if (jfs_inode_cachep == NULL)
 580                 return -ENOMEM;
 581
 582         /*
 583          * Metapage initialization
 584          */
 585         rc = metapage_init();
 586         if (rc) {
 587                 jfs_err("metapage_init failed w/rc = %d", rc);
 588                 goto free_slab;
 589         }
 590
 591         /*
 592          * Transaction Manager initialization
 593          */
 594         rc = txInit();
 595         if (rc) {
 596                 jfs_err("txInit failed w/rc = %d", rc);
 597                 goto free_metapage;
 598         }
 599
 600         /*
 601          * I/O completion thread (endio)
 602          */
 603         jfsIOthread = kernel_thread(jfsIOWait, 0, CLONE_KERNEL);
 604         if (jfsIOthread < 0) {
 605                 jfs_err("init_jfs_fs: fork failed w/rc = %d", jfsIOthread);
 606                 goto end_txmngr;
 607         }
 608         wait_for_completion(&jfsIOwait);        /* Wait until thread starts */
 609
 610         if (commit_threads < 1)
 611                 commit_threads = num_online_cpus();
 612         else if (commit_threads > MAX_COMMIT_THREADS)
 613                 commit_threads = MAX_COMMIT_THREADS;
 614
 615         for (i = 0; i < commit_threads; i++) {
 616                 jfsCommitThread[i] = kernel_thread(jfs_lazycommit, 0,
 617                                                    CLONE_KERNEL);
 618                 if (jfsCommitThread[i] < 0) {
 619                         jfs_err("init_jfs_fs: fork failed w/rc = %d",
 620                                 jfsCommitThread[i]);
 621                         commit_threads = i;
 622                         goto kill_committask;
 623                 }
 624                 /* Wait until thread starts */
 625                 wait_for_completion(&jfsIOwait);
 626         }
 627
 628         jfsSyncThread = kernel_thread(jfs_sync, 0, CLONE_KERNEL);
 629         if (jfsSyncThread < 0) {
 630                 jfs_err("init_jfs_fs: fork failed w/rc = %d", jfsSyncThread);
 631                 goto kill_committask;
 632         }
 633         wait_for_completion(&jfsIOwait);        /* Wait until thread starts */
 634
 635 #ifdef PROC_FS_JFS
 636         jfs_proc_init();
 637 #endif
 638
 639         return register_filesystem(&jfs_fs_type);
 640
 641 kill_committask:
 642         jfs_stop_threads = 1;
 643         wake_up_all(&jfs_commit_thread_wait);
 644         for (i = 0; i < commit_threads; i++)
 645                 wait_for_completion(&jfsIOwait);
 646
 647         wake_up(&jfs_IO_thread_wait);
 648         wait_for_completion(&jfsIOwait);        /* Wait for thread exit */
 649 end_txmngr:
 650         txExit();
 651 free_metapage:
 652         metapage_exit();
 653 free_slab:
 654         kmem_cache_destroy(jfs_inode_cachep);
 655         return rc;
 656 }
 657
 658 static void __exit exit_jfs_fs(void)
 659 {
 660         int i;
 661
 662         jfs_info("exit_jfs_fs called");
 663
 664         jfs_stop_threads = 1;
 665         txExit();
 666         metapage_exit();
 667         wake_up(&jfs_IO_thread_wait);
 668         wait_for_completion(&jfsIOwait);        /* Wait until IO thread exits */
 669         wake_up_all(&jfs_commit_thread_wait);
 670         for (i = 0; i < commit_threads; i++)
 671                 wait_for_completion(&jfsIOwait);
 672         wake_up(&jfs_sync_thread_wait);
 673         wait_for_completion(&jfsIOwait);        /* Wait until Sync thread exits */
 674 #ifdef PROC_FS_JFS
 675         jfs_proc_clean();
 676 #endif
 677         unregister_filesystem(&jfs_fs_type);
 678         kmem_cache_destroy(jfs_inode_cachep);
 679 }
 680
 681 module_init(init_jfs_fs)
 682 module_exit(exit_jfs_fs)