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_inode.h"
  32 #include "jfs_metapage.h"
  33 #include "jfs_superblock.h"
  34 #include "jfs_dmap.h"
  35 #include "jfs_imap.h"
  36 #include "jfs_acl.h"
  37 #include "jfs_debug.h"
  38
  39 MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
  40 MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
  41 MODULE_LICENSE("GPL");
  42
  43 static kmem_cache_t * jfs_inode_cachep;
  44
  45 static struct super_operations jfs_super_operations;
  46 static struct export_operations jfs_export_operations;
  47 static struct file_system_type jfs_fs_type;
  48
  49 #define MAX_COMMIT_THREADS 64
  50 static int commit_threads = 0;
  51 module_param(commit_threads, int, 0);
  52 MODULE_PARM_DESC(commit_threads, "Number of commit threads");
  53
  54 int jfs_stop_threads;
  55 static pid_t jfsIOthread;
  56 static pid_t jfsCommitThread[MAX_COMMIT_THREADS];
  57 static pid_t jfsSyncThread;
  58 DECLARE_COMPLETION(jfsIOwait);
  59
  60 #ifdef CONFIG_JFS_DEBUG
  61 int jfsloglevel = JFS_LOGLEVEL_WARN;
  62 module_param(jfsloglevel, int, 0644);
  63 MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
  64 #endif
  65
  66 static void jfs_handle_error(struct super_block *sb)
  67 {
  68         struct jfs_sb_info *sbi = JFS_SBI(sb);
  69
  70         if (sb->s_flags & MS_RDONLY)
  71                 return;
  72
  73         updateSuper(sb, FM_DIRTY);
  74
  75         if (sbi->flag & JFS_ERR_PANIC)
  76                 panic("JFS (device %s): panic forced after error\n",
  77                         sb->s_id);
  78         else if (sbi->flag & JFS_ERR_REMOUNT_RO) {
  79                 jfs_err("ERROR: (device %s): remounting filesystem "
  80                         "as read-only\n",
  81                         sb->s_id);
  82                 sb->s_flags |= MS_RDONLY;
  83         }
  84
  85         /* nothing is done for continue beyond marking the superblock dirty */
  86 }
  87
  88 void jfs_error(struct super_block *sb, const char * function, ...)
  89 {
  90         static char error_buf[256];
  91         va_list args;
  92
  93         va_start(args, function);
  94         vsprintf(error_buf, function, args);
  95         va_end(args);
  96
  97         printk(KERN_ERR "ERROR: (device %s): %s\n", sb->s_id, error_buf);
  98
  99         jfs_handle_error(sb);
 100 }
 101
 102 static struct inode *jfs_alloc_inode(struct super_block *sb)
 103 {
 104         struct jfs_inode_info *jfs_inode;
 105
 106         jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS);
 107         if (!jfs_inode)
 108                 return NULL;
 109         return &jfs_inode->vfs_inode;
 110 }
 111
 112 static void jfs_destroy_inode(struct inode *inode)
 113 {
 114         struct jfs_inode_info *ji = JFS_IP(inode);
 115
 116         spin_lock_irq(&ji->ag_lock);
 117         if (ji->active_ag != -1) {
 118                 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
 119                 atomic_dec(&bmap->db_active[ji->active_ag]);
 120                 ji->active_ag = -1;
 121         }
 122         spin_unlock_irq(&ji->ag_lock);
 123
 124 #ifdef CONFIG_JFS_POSIX_ACL
 125         if (ji->i_acl != JFS_ACL_NOT_CACHED) {
 126                 posix_acl_release(ji->i_acl);
 127                 ji->i_acl = JFS_ACL_NOT_CACHED;
 128         }
 129         if (ji->i_default_acl != JFS_ACL_NOT_CACHED) {
 130                 posix_acl_release(ji->i_default_acl);
 131                 ji->i_default_acl = JFS_ACL_NOT_CACHED;
 132         }
 133 #endif
 134
 135         kmem_cache_free(jfs_inode_cachep, ji);
 136 }
 137
 138 static int jfs_statfs(struct super_block *sb, struct kstatfs *buf)
 139 {
 140         struct jfs_sb_info *sbi = JFS_SBI(sb);
 141         s64 maxinodes;
 142         struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
 143
 144         jfs_info("In jfs_statfs");
 145         buf->f_type = JFS_SUPER_MAGIC;
 146         buf->f_bsize = sbi->bsize;
 147         buf->f_blocks = sbi->bmap->db_mapsize;
 148         buf->f_bfree = sbi->bmap->db_nfree;
 149         buf->f_bavail = sbi->bmap->db_nfree;
 150         /*
 151          * If we really return the number of allocated & free inodes, some
 152          * applications will fail because they won't see enough free inodes.
 153          * We'll try to calculate some guess as to how may inodes we can
 154          * really allocate
 155          *
 156          * buf->f_files = atomic_read(&imap->im_numinos);
 157          * buf->f_ffree = atomic_read(&imap->im_numfree);
 158          */
 159         maxinodes = min((s64) atomic_read(&imap->im_numinos) +
 160                         ((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
 161                          << L2INOSPEREXT), (s64) 0xffffffffLL);
 162         buf->f_files = maxinodes;
 163         buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
 164                                     atomic_read(&imap->im_numfree));
 165
 166         buf->f_namelen = JFS_NAME_MAX;
 167         return 0;
 168 }
 169
 170 static void jfs_put_super(struct super_block *sb)
 171 {
 172         struct jfs_sb_info *sbi = JFS_SBI(sb);
 173         int rc;
 174
 175         jfs_info("In jfs_put_super");
 176         rc = jfs_umount(sb);
 177         if (rc)
 178                 jfs_err("jfs_umount failed with return code %d", rc);
 179         if (sbi->nls_tab)
 180                 unload_nls(sbi->nls_tab);
 181         sbi->nls_tab = NULL;
 182
 183         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
 184         iput(sbi->direct_inode);
 185         sbi->direct_inode = NULL;
 186
 187         kfree(sbi);
 188 }
 189
 190 enum {
 191         Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
 192         Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err,
 193 };
 194
 195 static match_table_t tokens = {
 196         {Opt_integrity, "integrity"},
 197         {Opt_nointegrity, "nointegrity"},
 198         {Opt_iocharset, "iocharset=%s"},
 199         {Opt_resize, "resize=%u"},
 200         {Opt_resize_nosize, "resize"},
 201         {Opt_errors, "errors=%s"},
 202         {Opt_ignore, "noquota"},
 203         {Opt_ignore, "quota"},
 204         {Opt_ignore, "usrquota"},
 205         {Opt_ignore, "grpquota"},
 206         {Opt_err, NULL}
 207 };
 208
 209 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
 210                          int *flag)
 211 {
 212         void *nls_map = (void *)-1;     /* -1: no change;  NULL: none */
 213         char *p;
 214         struct jfs_sb_info *sbi = JFS_SBI(sb);
 215
 216         *newLVSize = 0;
 217
 218         if (!options)
 219                 return 1;
 220
 221         while ((p = strsep(&options, ",")) != NULL) {
 222                 substring_t args[MAX_OPT_ARGS];
 223                 int token;
 224                 if (!*p)
 225                         continue;
 226
 227                 token = match_token(p, tokens, args);
 228                 switch (token) {
 229                 case Opt_integrity:
 230                         *flag &= ~JFS_NOINTEGRITY;
 231                         break;
 232                 case Opt_nointegrity:
 233                         *flag |= JFS_NOINTEGRITY;
 234                         break;
 235                 case Opt_ignore:
 236                         /* Silently ignore the quota options */
 237                         /* Don't do anything ;-) */
 238                         break;
 239                 case Opt_iocharset:
 240                         if (nls_map && nls_map != (void *) -1)
 241                                 unload_nls(nls_map);
 242                         if (!strcmp(args[0].from, "none"))
 243                                 nls_map = NULL;
 244                         else {
 245                                 nls_map = load_nls(args[0].from);
 246                                 if (!nls_map) {
 247                                         printk(KERN_ERR
 248                                                "JFS: charset not found\n");
 249                                         goto cleanup;
 250                                 }
 251                         }
 252                         break;
 253                 case Opt_resize:
 254                 {
 255                         char *resize = args[0].from;
 256                         *newLVSize = simple_strtoull(resize, &resize, 0);
 257                         break;
 258                 }
 259                 case Opt_resize_nosize:
 260                 {
 261                         *newLVSize = sb->s_bdev->bd_inode->i_size >>
 262                                 sb->s_blocksize_bits;
 263                         if (*newLVSize == 0)
 264                                 printk(KERN_ERR
 265                                        "JFS: Cannot determine volume size\n");
 266                         break;
 267                 }
 268                 case Opt_errors:
 269                 {
 270                         char *errors = args[0].from;
 271                         if (!errors || !*errors)
 272                                 goto cleanup;
 273                         if (!strcmp(errors, "continue")) {
 274                                 *flag &= ~JFS_ERR_REMOUNT_RO;
 275                                 *flag &= ~JFS_ERR_PANIC;
 276                                 *flag |= JFS_ERR_CONTINUE;
 277                         } else if (!strcmp(errors, "remount-ro")) {
 278                                 *flag &= ~JFS_ERR_CONTINUE;
 279                                 *flag &= ~JFS_ERR_PANIC;
 280                                 *flag |= JFS_ERR_REMOUNT_RO;
 281                         } else if (!strcmp(errors, "panic")) {
 282                                 *flag &= ~JFS_ERR_CONTINUE;
 283                                 *flag &= ~JFS_ERR_REMOUNT_RO;
 284                                 *flag |= JFS_ERR_PANIC;
 285                         } else {
 286                                 printk(KERN_ERR
 287                                        "JFS: %s is an invalid error handler\n",
 288                                        errors);
 289                                 goto cleanup;
 290                         }
 291                         break;
 292                 }
 293                 default:
 294                         printk("jfs: Unrecognized mount option \"%s\" "
 295                                         " or missing value\n", p);
 296                         goto cleanup;
 297                 }
 298         }
 299
 300         if (nls_map != (void *) -1) {
 301                 /* Discard old (if remount) */
 302                 if (sbi->nls_tab)
 303                         unload_nls(sbi->nls_tab);
 304                 sbi->nls_tab = nls_map;
 305         }
 306         return 1;
 307
 308 cleanup:
 309         if (nls_map && nls_map != (void *) -1)
 310                 unload_nls(nls_map);
 311         return 0;
 312 }
 313
 314 static int jfs_remount(struct super_block *sb, int *flags, char *data)
 315 {
 316         s64 newLVSize = 0;
 317         int rc = 0;
 318         int flag = JFS_SBI(sb)->flag;
 319
 320         if (!parse_options(data, sb, &newLVSize, &flag)) {
 321                 return -EINVAL;
 322         }
 323         if (newLVSize) {
 324                 if (sb->s_flags & MS_RDONLY) {
 325                         printk(KERN_ERR
 326                   "JFS: resize requires volume to be mounted read-write\n");
 327                         return -EROFS;
 328                 }
 329                 rc = jfs_extendfs(sb, newLVSize, 0);
 330                 if (rc)
 331                         return rc;
 332         }
 333
 334         if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
 335                 /*
 336                  * Invalidate any previously read metadata.  fsck may have
 337                  * changed the on-disk data since we mounted r/o
 338                  */
 339                 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
 340
 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         sbi->sb = sb;
 381
 382         /* initialize the mount flag and determine the default error handler */
 383         flag = JFS_ERR_REMOUNT_RO;
 384
 385         if (!parse_options((char *) data, sb, &newLVSize, &flag)) {
 386                 kfree(sbi);
 387                 return -EINVAL;
 388         }
 389         sbi->flag = flag;
 390
 391 #ifdef CONFIG_JFS_POSIX_ACL
 392         sb->s_flags |= MS_POSIXACL;
 393 #endif
 394
 395         if (newLVSize) {
 396                 printk(KERN_ERR "resize option for remount only\n");
 397                 return -EINVAL;
 398         }
 399
 400         /*
 401          * Initialize blocksize to 4K.
 402          */
 403         sb_set_blocksize(sb, PSIZE);
 404
 405         /*
 406          * Set method vectors.
 407          */
 408         sb->s_op = &jfs_super_operations;
 409         sb->s_export_op = &jfs_export_operations;
 410
 411         /*
 412          * Initialize direct-mapping inode/address-space
 413          */
 414         inode = new_inode(sb);
 415         if (inode == NULL)
 416                 goto out_kfree;
 417         inode->i_ino = 0;
 418         inode->i_nlink = 1;
 419         inode->i_size = sb->s_bdev->bd_inode->i_size;
 420         inode->i_mapping->a_ops = &jfs_metapage_aops;
 421         mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
 422
 423         sbi->direct_inode = inode;
 424
 425         rc = jfs_mount(sb);
 426         if (rc) {
 427                 if (!silent) {
 428                         jfs_err("jfs_mount failed w/return code = %d", rc);
 429                 }
 430                 goto out_mount_failed;
 431         }
 432         if (sb->s_flags & MS_RDONLY)
 433                 sbi->log = NULL;
 434         else {
 435                 rc = jfs_mount_rw(sb, 0);
 436                 if (rc) {
 437                         if (!silent) {
 438                                 jfs_err("jfs_mount_rw failed, return code = %d",
 439                                         rc);
 440                         }
 441                         goto out_no_rw;
 442                 }
 443         }
 444
 445         sb->s_magic = JFS_SUPER_MAGIC;
 446
 447         inode = iget(sb, ROOT_I);
 448         if (!inode || is_bad_inode(inode))
 449                 goto out_no_root;
 450         sb->s_root = d_alloc_root(inode);
 451         if (!sb->s_root)
 452                 goto out_no_root;
 453
 454         if (sbi->mntflag & JFS_OS2)
 455                 sb->s_root->d_op = &jfs_ci_dentry_operations;
 456
 457         /* logical blocks are represented by 40 bits in pxd_t, etc. */
 458         sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
 459 #if BITS_PER_LONG == 32
 460         /*
 461          * Page cache is indexed by long.
 462          * I would use MAX_LFS_FILESIZE, but it's only half as big
 463          */
 464         sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, sb->s_maxbytes);
 465 #endif
 466         sb->s_time_gran = 1;
 467         return 0;
 468
 469 out_no_root:
 470         jfs_err("jfs_read_super: get root inode failed");
 471         if (inode)
 472                 iput(inode);
 473
 474 out_no_rw:
 475         rc = jfs_umount(sb);
 476         if (rc) {
 477                 jfs_err("jfs_umount failed with return code %d", rc);
 478         }
 479 out_mount_failed:
 480         filemap_fdatawrite(sbi->direct_inode->i_mapping);
 481         filemap_fdatawait(sbi->direct_inode->i_mapping);
 482         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
 483         make_bad_inode(sbi->direct_inode);
 484         iput(sbi->direct_inode);
 485         sbi->direct_inode = NULL;
 486 out_kfree:
 487         if (sbi->nls_tab)
 488                 unload_nls(sbi->nls_tab);
 489         kfree(sbi);
 490         return -EINVAL;
 491 }
 492
 493 static void jfs_write_super_lockfs(struct super_block *sb)
 494 {
 495         struct jfs_sb_info *sbi = JFS_SBI(sb);
 496         struct jfs_log *log = sbi->log;
 497
 498         if (!(sb->s_flags & MS_RDONLY)) {
 499                 txQuiesce(sb);
 500                 lmLogShutdown(log);
 501                 updateSuper(sb, FM_CLEAN);
 502         }
 503 }
 504
 505 static void jfs_unlockfs(struct super_block *sb)
 506 {
 507         struct jfs_sb_info *sbi = JFS_SBI(sb);
 508         struct jfs_log *log = sbi->log;
 509         int rc = 0;
 510
 511         if (!(sb->s_flags & MS_RDONLY)) {
 512                 updateSuper(sb, FM_MOUNT);
 513                 if ((rc = lmLogInit(log)))
 514                         jfs_err("jfs_unlock failed with return code %d", rc);
 515                 else
 516                         txResume(sb);
 517         }
 518 }
 519
 520 static struct super_block *jfs_get_sb(struct file_system_type *fs_type,
 521         int flags, const char *dev_name, void *data)
 522 {
 523         return get_sb_bdev(fs_type, flags, dev_name, data, jfs_fill_super);
 524 }
 525
 526 static int jfs_sync_fs(struct super_block *sb, int wait)
 527 {
 528         struct jfs_log *log = JFS_SBI(sb)->log;
 529
 530         /* log == NULL indicates read-only mount */
 531         if (log) {
 532                 jfs_flush_journal(log, wait);
 533                 jfs_syncpt(log);
 534         }
 535
 536         return 0;
 537 }
 538
 539 static struct super_operations jfs_super_operations = {
 540         .alloc_inode    = jfs_alloc_inode,
 541         .destroy_inode  = jfs_destroy_inode,
 542         .read_inode     = jfs_read_inode,
 543         .dirty_inode    = jfs_dirty_inode,
 544         .write_inode    = jfs_write_inode,
 545         .delete_inode   = jfs_delete_inode,
 546         .put_super      = jfs_put_super,
 547         .sync_fs        = jfs_sync_fs,
 548         .write_super_lockfs = jfs_write_super_lockfs,
 549         .unlockfs       = jfs_unlockfs,
 550         .statfs         = jfs_statfs,
 551         .remount_fs     = jfs_remount,
 552 };
 553
 554 static struct export_operations jfs_export_operations = {
 555         .get_parent     = jfs_get_parent,
 556 };
 557
 558 static struct file_system_type jfs_fs_type = {
 559         .owner          = THIS_MODULE,
 560         .name           = "jfs",
 561         .get_sb         = jfs_get_sb,
 562         .kill_sb        = kill_block_super,
 563         .fs_flags       = FS_REQUIRES_DEV,
 564 };
 565
 566 static void init_once(void *foo, kmem_cache_t * cachep, unsigned long flags)
 567 {
 568         struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
 569
 570         if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
 571             SLAB_CTOR_CONSTRUCTOR) {
 572                 memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
 573                 INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
 574                 init_rwsem(&jfs_ip->rdwrlock);
 575                 init_MUTEX(&jfs_ip->commit_sem);
 576                 init_rwsem(&jfs_ip->xattr_sem);
 577                 spin_lock_init(&jfs_ip->ag_lock);
 578                 jfs_ip->active_ag = -1;
 579 #ifdef CONFIG_JFS_POSIX_ACL
 580                 jfs_ip->i_acl = JFS_ACL_NOT_CACHED;
 581                 jfs_ip->i_default_acl = JFS_ACL_NOT_CACHED;
 582 #endif
 583                 inode_init_once(&jfs_ip->vfs_inode);
 584         }
 585 }
 586
 587 static int __init init_jfs_fs(void)
 588 {
 589         int i;
 590         int rc;
 591
 592         jfs_inode_cachep =
 593             kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
 594                             SLAB_RECLAIM_ACCOUNT, init_once, NULL);
 595         if (jfs_inode_cachep == NULL)
 596                 return -ENOMEM;
 597
 598         /*
 599          * Metapage initialization
 600          */
 601         rc = metapage_init();
 602         if (rc) {
 603                 jfs_err("metapage_init failed w/rc = %d", rc);
 604                 goto free_slab;
 605         }
 606
 607         /*
 608          * Transaction Manager initialization
 609          */
 610         rc = txInit();
 611         if (rc) {
 612                 jfs_err("txInit failed w/rc = %d", rc);
 613                 goto free_metapage;
 614         }
 615
 616         /*
 617          * I/O completion thread (endio)
 618          */
 619         jfsIOthread = kernel_thread(jfsIOWait, NULL, CLONE_KERNEL);
 620         if (jfsIOthread < 0) {
 621                 jfs_err("init_jfs_fs: fork failed w/rc = %d", jfsIOthread);
 622                 goto end_txmngr;
 623         }
 624         wait_for_completion(&jfsIOwait);        /* Wait until thread starts */
 625
 626         if (commit_threads < 1)
 627                 commit_threads = num_online_cpus();
 628         if (commit_threads > MAX_COMMIT_THREADS)
 629                 commit_threads = MAX_COMMIT_THREADS;
 630
 631         for (i = 0; i < commit_threads; i++) {
 632                 jfsCommitThread[i] = kernel_thread(jfs_lazycommit, NULL,
 633                                                    CLONE_KERNEL);
 634                 if (jfsCommitThread[i] < 0) {
 635                         jfs_err("init_jfs_fs: fork failed w/rc = %d",
 636                                 jfsCommitThread[i]);
 637                         commit_threads = i;
 638                         goto kill_committask;
 639                 }
 640                 /* Wait until thread starts */
 641                 wait_for_completion(&jfsIOwait);
 642         }
 643
 644         jfsSyncThread = kernel_thread(jfs_sync, NULL, CLONE_KERNEL);
 645         if (jfsSyncThread < 0) {
 646                 jfs_err("init_jfs_fs: fork failed w/rc = %d", jfsSyncThread);
 647                 goto kill_committask;
 648         }
 649         wait_for_completion(&jfsIOwait);        /* Wait until thread starts */
 650
 651 #ifdef PROC_FS_JFS
 652         jfs_proc_init();
 653 #endif
 654
 655         return register_filesystem(&jfs_fs_type);
 656
 657 kill_committask:
 658         jfs_stop_threads = 1;
 659         wake_up_all(&jfs_commit_thread_wait);
 660         for (i = 0; i < commit_threads; i++)
 661                 wait_for_completion(&jfsIOwait);
 662
 663         wake_up(&jfs_IO_thread_wait);
 664         wait_for_completion(&jfsIOwait);        /* Wait for thread exit */
 665 end_txmngr:
 666         txExit();
 667 free_metapage:
 668         metapage_exit();
 669 free_slab:
 670         kmem_cache_destroy(jfs_inode_cachep);
 671         return rc;
 672 }
 673
 674 static void __exit exit_jfs_fs(void)
 675 {
 676         int i;
 677
 678         jfs_info("exit_jfs_fs called");
 679
 680         jfs_stop_threads = 1;
 681         txExit();
 682         metapage_exit();
 683         wake_up(&jfs_IO_thread_wait);
 684         wait_for_completion(&jfsIOwait);        /* Wait until IO thread exits */
 685         wake_up_all(&jfs_commit_thread_wait);
 686         for (i = 0; i < commit_threads; i++)
 687                 wait_for_completion(&jfsIOwait);
 688         wake_up(&jfs_sync_thread_wait);
 689         wait_for_completion(&jfsIOwait);        /* Wait until Sync thread exits */
 690 #ifdef PROC_FS_JFS
 691         jfs_proc_clean();
 692 #endif
 693         unregister_filesystem(&jfs_fs_type);
 694         kmem_cache_destroy(jfs_inode_cachep);
 695 }
 696
 697 module_init(init_jfs_fs)
 698 module_exit(exit_jfs_fs)