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, 0644);
  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 int 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 extern struct dentry_operations jfs_ci_dentry_operations;
  86
  87 #ifdef PROC_FS_JFS              /* see jfs_debug.h */
  88 extern void jfs_proc_init(void);
  89 extern void jfs_proc_clean(void);
  90 #endif
  91
  92 extern wait_queue_head_t jfs_IO_thread_wait;
  93 extern wait_queue_head_t jfs_commit_thread_wait;
  94 extern wait_queue_head_t jfs_sync_thread_wait;
  95
  96 static void jfs_handle_error(struct super_block *sb)
  97 {
  98         struct jfs_sb_info *sbi = JFS_SBI(sb);
  99
 100         if (sb->s_flags & MS_RDONLY)
 101                 return;
 102
 103         updateSuper(sb, FM_DIRTY);
 104
 105         if (sbi->flag & JFS_ERR_PANIC)
 106                 panic("JFS (device %s): panic forced after error\n",
 107                         sb->s_id);
 108         else if (sbi->flag & JFS_ERR_REMOUNT_RO) {
 109                 jfs_err("ERROR: (device %s): remounting filesystem "
 110                         "as read-only\n",
 111                         sb->s_id);
 112                 sb->s_flags |= MS_RDONLY;
 113         }
 114
 115         /* nothing is done for continue beyond marking the superblock dirty */
 116 }
 117
 118 void jfs_error(struct super_block *sb, const char * function, ...)
 119 {
 120         static char error_buf[256];
 121         va_list args;
 122
 123         va_start(args, function);
 124         vsprintf(error_buf, function, args);
 125         va_end(args);
 126
 127         printk(KERN_ERR "ERROR: (device %s): %s\n", sb->s_id, error_buf);
 128
 129         jfs_handle_error(sb);
 130 }
 131
 132 static struct inode *jfs_alloc_inode(struct super_block *sb)
 133 {
 134         struct jfs_inode_info *jfs_inode;
 135
 136         jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS);
 137         if (!jfs_inode)
 138                 return NULL;
 139         return &jfs_inode->vfs_inode;
 140 }
 141
 142 static void jfs_destroy_inode(struct inode *inode)
 143 {
 144         struct jfs_inode_info *ji = JFS_IP(inode);
 145
 146         spin_lock_irq(&ji->ag_lock);
 147         if (ji->active_ag != -1) {
 148                 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
 149                 atomic_dec(&bmap->db_active[ji->active_ag]);
 150                 ji->active_ag = -1;
 151         }
 152         spin_unlock_irq(&ji->ag_lock);
 153
 154 #ifdef CONFIG_JFS_POSIX_ACL
 155         if (ji->i_acl != JFS_ACL_NOT_CACHED) {
 156                 posix_acl_release(ji->i_acl);
 157                 ji->i_acl = JFS_ACL_NOT_CACHED;
 158         }
 159         if (ji->i_default_acl != JFS_ACL_NOT_CACHED) {
 160                 posix_acl_release(ji->i_default_acl);
 161                 ji->i_default_acl = JFS_ACL_NOT_CACHED;
 162         }
 163 #endif
 164
 165         kmem_cache_free(jfs_inode_cachep, ji);
 166 }
 167
 168 static int jfs_statfs(struct super_block *sb, struct kstatfs *buf)
 169 {
 170         struct jfs_sb_info *sbi = JFS_SBI(sb);
 171         s64 maxinodes;
 172         struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
 173
 174         jfs_info("In jfs_statfs");
 175         buf->f_type = JFS_SUPER_MAGIC;
 176         buf->f_bsize = sbi->bsize;
 177         buf->f_blocks = sbi->bmap->db_mapsize;
 178         buf->f_bfree = sbi->bmap->db_nfree;
 179         buf->f_bavail = sbi->bmap->db_nfree;
 180         /*
 181          * If we really return the number of allocated & free inodes, some
 182          * applications will fail because they won't see enough free inodes.
 183          * We'll try to calculate some guess as to how may inodes we can
 184          * really allocate
 185          *
 186          * buf->f_files = atomic_read(&imap->im_numinos);
 187          * buf->f_ffree = atomic_read(&imap->im_numfree);
 188          */
 189         maxinodes = min((s64) atomic_read(&imap->im_numinos) +
 190                         ((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
 191                          << L2INOSPEREXT), (s64) 0xffffffffLL);
 192         buf->f_files = maxinodes;
 193         buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
 194                                     atomic_read(&imap->im_numfree));
 195
 196         buf->f_namelen = JFS_NAME_MAX;
 197         return 0;
 198 }
 199
 200 static void jfs_put_super(struct super_block *sb)
 201 {
 202         struct jfs_sb_info *sbi = JFS_SBI(sb);
 203         int rc;
 204
 205         jfs_info("In jfs_put_super");
 206         rc = jfs_umount(sb);
 207         if (rc)
 208                 jfs_err("jfs_umount failed with return code %d", rc);
 209         if (sbi->nls_tab)
 210                 unload_nls(sbi->nls_tab);
 211         sbi->nls_tab = NULL;
 212
 213         kfree(sbi);
 214 }
 215
 216 enum {
 217         Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
 218         Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err,
 219 };
 220
 221 static match_table_t tokens = {
 222         {Opt_integrity, "integrity"},
 223         {Opt_nointegrity, "nointegrity"},
 224         {Opt_iocharset, "iocharset=%s"},
 225         {Opt_resize, "resize=%u"},
 226         {Opt_resize_nosize, "resize"},
 227         {Opt_errors, "errors=%s"},
 228         {Opt_ignore, "noquota"},
 229         {Opt_ignore, "quota"},
 230         {Opt_ignore, "usrquota"},
 231         {Opt_ignore, "grpquota"},
 232         {Opt_err, NULL}
 233 };
 234
 235 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
 236                          int *flag)
 237 {
 238         void *nls_map = (void *)-1;     /* -1: no change;  NULL: none */
 239         char *p;
 240         struct jfs_sb_info *sbi = JFS_SBI(sb);
 241
 242         *newLVSize = 0;
 243
 244         if (!options)
 245                 return 1;
 246
 247         while ((p = strsep(&options, ",")) != NULL) {
 248                 substring_t args[MAX_OPT_ARGS];
 249                 int token;
 250                 if (!*p)
 251                         continue;
 252
 253                 token = match_token(p, tokens, args);
 254                 switch (token) {
 255                 case Opt_integrity:
 256                         *flag &= ~JFS_NOINTEGRITY;
 257                         break;
 258                 case Opt_nointegrity:
 259                         *flag |= JFS_NOINTEGRITY;
 260                         break;
 261                 case Opt_ignore:
 262                         /* Silently ignore the quota options */
 263                         /* Don't do anything ;-) */
 264                         break;
 265                 case Opt_iocharset:
 266                         if (nls_map && nls_map != (void *) -1)
 267                                 unload_nls(nls_map);
 268                         if (!strcmp(args[0].from, "none"))
 269                                 nls_map = NULL;
 270                         else {
 271                                 nls_map = load_nls(args[0].from);
 272                                 if (!nls_map) {
 273                                         printk(KERN_ERR
 274                                                "JFS: charset not found\n");
 275                                         goto cleanup;
 276                                 }
 277                         }
 278                         break;
 279                 case Opt_resize:
 280                 {
 281                         char *resize = args[0].from;
 282                         *newLVSize = simple_strtoull(resize, &resize, 0);
 283                         break;
 284                 }
 285                 case Opt_resize_nosize:
 286                 {
 287                         *newLVSize = sb->s_bdev->bd_inode->i_size >>
 288                                 sb->s_blocksize_bits;
 289                         if (*newLVSize == 0)
 290                                 printk(KERN_ERR
 291                                        "JFS: Cannot determine volume size\n");
 292                         break;
 293                 }
 294                 case Opt_errors:
 295                 {
 296                         char *errors = args[0].from;
 297                         if (!errors || !*errors)
 298                                 goto cleanup;
 299                         if (!strcmp(errors, "continue")) {
 300                                 *flag &= ~JFS_ERR_REMOUNT_RO;
 301                                 *flag &= ~JFS_ERR_PANIC;
 302                                 *flag |= JFS_ERR_CONTINUE;
 303                         } else if (!strcmp(errors, "remount-ro")) {
 304                                 *flag &= ~JFS_ERR_CONTINUE;
 305                                 *flag &= ~JFS_ERR_PANIC;
 306                                 *flag |= JFS_ERR_REMOUNT_RO;
 307                         } else if (!strcmp(errors, "panic")) {
 308                                 *flag &= ~JFS_ERR_CONTINUE;
 309                                 *flag &= ~JFS_ERR_REMOUNT_RO;
 310                                 *flag |= JFS_ERR_PANIC;
 311                         } else {
 312                                 printk(KERN_ERR
 313                                        "JFS: %s is an invalid error handler\n",
 314                                        errors);
 315                                 goto cleanup;
 316                         }
 317                         break;
 318                 }
 319                 default:
 320                         printk("jfs: Unrecognized mount option \"%s\" "
 321                                         " or missing value\n", p);
 322                         goto cleanup;
 323                 }
 324         }
 325
 326         if (nls_map != (void *) -1) {
 327                 /* Discard old (if remount) */
 328                 if (sbi->nls_tab)
 329                         unload_nls(sbi->nls_tab);
 330                 sbi->nls_tab = nls_map;
 331         }
 332         return 1;
 333
 334 cleanup:
 335         if (nls_map && nls_map != (void *) -1)
 336                 unload_nls(nls_map);
 337         return 0;
 338 }
 339
 340 static int jfs_remount(struct super_block *sb, int *flags, char *data)
 341 {
 342         s64 newLVSize = 0;
 343         int rc = 0;
 344         int flag = JFS_SBI(sb)->flag;
 345
 346         if (!parse_options(data, sb, &newLVSize, &flag)) {
 347                 return -EINVAL;
 348         }
 349         if (newLVSize) {
 350                 if (sb->s_flags & MS_RDONLY) {
 351                         printk(KERN_ERR
 352                   "JFS: resize requires volume to be mounted read-write\n");
 353                         return -EROFS;
 354                 }
 355                 rc = jfs_extendfs(sb, newLVSize, 0);
 356                 if (rc)
 357                         return rc;
 358         }
 359
 360         if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
 361                 JFS_SBI(sb)->flag = flag;
 362                 return jfs_mount_rw(sb, 1);
 363         }
 364         if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
 365                 rc = jfs_umount_rw(sb);
 366                 JFS_SBI(sb)->flag = flag;
 367                 return rc;
 368         }
 369         if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
 370                 if (!(sb->s_flags & MS_RDONLY)) {
 371                         rc = jfs_umount_rw(sb);
 372                         if (rc)
 373                                 return rc;
 374                         JFS_SBI(sb)->flag = flag;
 375                         return jfs_mount_rw(sb, 1);
 376                 }
 377         JFS_SBI(sb)->flag = flag;
 378
 379         return 0;
 380 }
 381
 382 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
 383 {
 384         struct jfs_sb_info *sbi;
 385         struct inode *inode;
 386         int rc;
 387         s64 newLVSize = 0;
 388         int flag;
 389
 390         jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
 391
 392         if (!new_valid_dev(sb->s_bdev->bd_dev))
 393                 return -EOVERFLOW;
 394
 395         sbi = kmalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
 396         if (!sbi)
 397                 return -ENOSPC;
 398         memset(sbi, 0, sizeof (struct jfs_sb_info));
 399         sb->s_fs_info = sbi;
 400         sbi->sb = sb;
 401
 402         /* initialize the mount flag and determine the default error handler */
 403         flag = JFS_ERR_REMOUNT_RO;
 404
 405         if (!parse_options((char *) data, sb, &newLVSize, &flag)) {
 406                 kfree(sbi);
 407                 return -EINVAL;
 408         }
 409         sbi->flag = flag;
 410
 411 #ifdef CONFIG_JFS_POSIX_ACL
 412         sb->s_flags |= MS_POSIXACL;
 413 #endif
 414
 415         if (newLVSize) {
 416                 printk(KERN_ERR "resize option for remount only\n");
 417                 return -EINVAL;
 418         }
 419
 420         /*
 421          * Initialize blocksize to 4K.
 422          */
 423         sb_set_blocksize(sb, PSIZE);
 424
 425         /*
 426          * Set method vectors.
 427          */
 428         sb->s_op = &jfs_super_operations;
 429         sb->s_export_op = &jfs_export_operations;
 430
 431         rc = jfs_mount(sb);
 432         if (rc) {
 433                 if (!silent) {
 434                         jfs_err("jfs_mount failed w/return code = %d", rc);
 435                 }
 436                 goto out_kfree;
 437         }
 438         if (sb->s_flags & MS_RDONLY)
 439                 sbi->log = NULL;
 440         else {
 441                 rc = jfs_mount_rw(sb, 0);
 442                 if (rc) {
 443                         if (!silent) {
 444                                 jfs_err("jfs_mount_rw failed, return code = %d",
 445                                         rc);
 446                         }
 447                         goto out_no_rw;
 448                 }
 449         }
 450
 451         sb->s_magic = JFS_SUPER_MAGIC;
 452
 453         inode = iget(sb, ROOT_I);
 454         if (!inode || is_bad_inode(inode))
 455                 goto out_no_root;
 456         sb->s_root = d_alloc_root(inode);
 457         if (!sb->s_root)
 458                 goto out_no_root;
 459
 460         if (sbi->mntflag & JFS_OS2)
 461                 sb->s_root->d_op = &jfs_ci_dentry_operations;
 462
 463         /* logical blocks are represented by 40 bits in pxd_t, etc. */
 464         sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
 465 #if BITS_PER_LONG == 32
 466         /*
 467          * Page cache is indexed by long.
 468          * I would use MAX_LFS_FILESIZE, but it's only half as big
 469          */
 470         sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, sb->s_maxbytes);
 471 #endif
 472         sb->s_time_gran = 1;
 473         return 0;
 474
 475 out_no_root:
 476         jfs_err("jfs_read_super: get root inode failed");
 477         if (inode)
 478                 iput(inode);
 479
 480 out_no_rw:
 481         rc = jfs_umount(sb);
 482         if (rc) {
 483                 jfs_err("jfs_umount failed with return code %d", rc);
 484         }
 485 out_kfree:
 486         if (sbi->nls_tab)
 487                 unload_nls(sbi->nls_tab);
 488         kfree(sbi);
 489         return -EINVAL;
 490 }
 491
 492 static void jfs_write_super_lockfs(struct super_block *sb)
 493 {
 494         struct jfs_sb_info *sbi = JFS_SBI(sb);
 495         struct jfs_log *log = sbi->log;
 496
 497         if (!(sb->s_flags & MS_RDONLY)) {
 498                 txQuiesce(sb);
 499                 lmLogShutdown(log);
 500                 updateSuper(sb, FM_CLEAN);
 501         }
 502 }
 503
 504 static void jfs_unlockfs(struct super_block *sb)
 505 {
 506         struct jfs_sb_info *sbi = JFS_SBI(sb);
 507         struct jfs_log *log = sbi->log;
 508         int rc = 0;
 509
 510         if (!(sb->s_flags & MS_RDONLY)) {
 511                 updateSuper(sb, FM_MOUNT);
 512                 if ((rc = lmLogInit(log)))
 513                         jfs_err("jfs_unlock failed with return code %d", rc);
 514                 else
 515                         txResume(sb);
 516         }
 517 }
 518
 519 static struct super_block *jfs_get_sb(struct file_system_type *fs_type,
 520         int flags, const char *dev_name, void *data)
 521 {
 522         return get_sb_bdev(fs_type, flags, dev_name, data, jfs_fill_super);
 523 }
 524
 525 static int jfs_sync_fs(struct super_block *sb, int wait)
 526 {
 527         struct jfs_log *log = JFS_SBI(sb)->log;
 528
 529         /* log == NULL indicates read-only mount */
 530         if (log)
 531                 jfs_flush_journal(log, wait);
 532
 533         return 0;
 534 }
 535
 536 static struct super_operations jfs_super_operations = {
 537         .alloc_inode    = jfs_alloc_inode,
 538         .destroy_inode  = jfs_destroy_inode,
 539         .read_inode     = jfs_read_inode,
 540         .dirty_inode    = jfs_dirty_inode,
 541         .write_inode    = jfs_write_inode,
 542         .delete_inode   = jfs_delete_inode,
 543         .put_super      = jfs_put_super,
 544         .sync_fs        = jfs_sync_fs,
 545         .write_super_lockfs = jfs_write_super_lockfs,
 546         .unlockfs       = jfs_unlockfs,
 547         .statfs         = jfs_statfs,
 548         .remount_fs     = jfs_remount,
 549 };
 550
 551 static struct export_operations jfs_export_operations = {
 552         .get_parent     = jfs_get_parent,
 553 };
 554
 555 static struct file_system_type jfs_fs_type = {
 556         .owner          = THIS_MODULE,
 557         .name           = "jfs",
 558         .get_sb         = jfs_get_sb,
 559         .kill_sb        = kill_block_super,
 560         .fs_flags       = FS_REQUIRES_DEV,
 561 };
 562
 563 extern int metapage_init(void);
 564 extern int txInit(void);
 565 extern void txExit(void);
 566 extern void metapage_exit(void);
 567
 568 static void init_once(void *foo, kmem_cache_t * cachep, unsigned long flags)
 569 {
 570         struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
 571
 572         if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
 573             SLAB_CTOR_CONSTRUCTOR) {
 574                 memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
 575                 INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
 576                 init_rwsem(&jfs_ip->rdwrlock);
 577                 init_MUTEX(&jfs_ip->commit_sem);
 578                 init_rwsem(&jfs_ip->xattr_sem);
 579                 spin_lock_init(&jfs_ip->ag_lock);
 580                 jfs_ip->active_ag = -1;
 581 #ifdef CONFIG_JFS_POSIX_ACL
 582                 jfs_ip->i_acl = JFS_ACL_NOT_CACHED;
 583                 jfs_ip->i_default_acl = JFS_ACL_NOT_CACHED;
 584 #endif
 585                 inode_init_once(&jfs_ip->vfs_inode);
 586         }
 587 }
 588
 589 static int __init init_jfs_fs(void)
 590 {
 591         int i;
 592         int rc;
 593
 594         jfs_inode_cachep =
 595             kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
 596                             SLAB_RECLAIM_ACCOUNT, init_once, NULL);
 597         if (jfs_inode_cachep == NULL)
 598                 return -ENOMEM;
 599
 600         /*
 601          * Metapage initialization
 602          */
 603         rc = metapage_init();
 604         if (rc) {
 605                 jfs_err("metapage_init failed w/rc = %d", rc);
 606                 goto free_slab;
 607         }
 608
 609         /*
 610          * Transaction Manager initialization
 611          */
 612         rc = txInit();
 613         if (rc) {
 614                 jfs_err("txInit failed w/rc = %d", rc);
 615                 goto free_metapage;
 616         }
 617
 618         /*
 619          * I/O completion thread (endio)
 620          */
 621         jfsIOthread = kernel_thread(jfsIOWait, NULL, CLONE_KERNEL);
 622         if (jfsIOthread < 0) {
 623                 jfs_err("init_jfs_fs: fork failed w/rc = %d", jfsIOthread);
 624                 goto end_txmngr;
 625         }
 626         wait_for_completion(&jfsIOwait);        /* Wait until thread starts */
 627
 628         if (commit_threads < 1)
 629                 commit_threads = num_online_cpus();
 630         if (commit_threads > MAX_COMMIT_THREADS)
 631                 commit_threads = MAX_COMMIT_THREADS;
 632
 633         for (i = 0; i < commit_threads; i++) {
 634                 jfsCommitThread[i] = kernel_thread(jfs_lazycommit, NULL,
 635                                                    CLONE_KERNEL);
 636                 if (jfsCommitThread[i] < 0) {
 637                         jfs_err("init_jfs_fs: fork failed w/rc = %d",
 638                                 jfsCommitThread[i]);
 639                         commit_threads = i;
 640                         goto kill_committask;
 641                 }
 642                 /* Wait until thread starts */
 643                 wait_for_completion(&jfsIOwait);
 644         }
 645
 646         jfsSyncThread = kernel_thread(jfs_sync, NULL, CLONE_KERNEL);
 647         if (jfsSyncThread < 0) {
 648                 jfs_err("init_jfs_fs: fork failed w/rc = %d", jfsSyncThread);
 649                 goto kill_committask;
 650         }
 651         wait_for_completion(&jfsIOwait);        /* Wait until thread starts */
 652
 653 #ifdef PROC_FS_JFS
 654         jfs_proc_init();
 655 #endif
 656
 657         return register_filesystem(&jfs_fs_type);
 658
 659 kill_committask:
 660         jfs_stop_threads = 1;
 661         wake_up_all(&jfs_commit_thread_wait);
 662         for (i = 0; i < commit_threads; i++)
 663                 wait_for_completion(&jfsIOwait);
 664
 665         wake_up(&jfs_IO_thread_wait);
 666         wait_for_completion(&jfsIOwait);        /* Wait for thread exit */
 667 end_txmngr:
 668         txExit();
 669 free_metapage:
 670         metapage_exit();
 671 free_slab:
 672         kmem_cache_destroy(jfs_inode_cachep);
 673         return rc;
 674 }
 675
 676 static void __exit exit_jfs_fs(void)
 677 {
 678         int i;
 679
 680         jfs_info("exit_jfs_fs called");
 681
 682         jfs_stop_threads = 1;
 683         txExit();
 684         metapage_exit();
 685         wake_up(&jfs_IO_thread_wait);
 686         wait_for_completion(&jfsIOwait);        /* Wait until IO thread exits */
 687         wake_up_all(&jfs_commit_thread_wait);
 688         for (i = 0; i < commit_threads; i++)
 689                 wait_for_completion(&jfsIOwait);
 690         wake_up(&jfs_sync_thread_wait);
 691         wait_for_completion(&jfsIOwait);        /* Wait until Sync thread exits */
 692 #ifdef PROC_FS_JFS
 693         jfs_proc_clean();
 694 #endif
 695         unregister_filesystem(&jfs_fs_type);
 696         kmem_cache_destroy(jfs_inode_cachep);
 697 }
 698
 699 module_init(init_jfs_fs)
 700 module_exit(exit_jfs_fs)