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 <linux/posix_acl.h>
  28 #include <asm/uaccess.h>
  29
  30 #include "jfs_incore.h"
  31 #include "jfs_filsys.h"
  32 #include "jfs_inode.h"
  33 #include "jfs_metapage.h"
  34 #include "jfs_superblock.h"
  35 #include "jfs_dmap.h"
  36 #include "jfs_imap.h"
  37 #include "jfs_acl.h"
  38 #include "jfs_debug.h"
  39
  40 MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
  41 MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
  42 MODULE_LICENSE("GPL");
  43
  44 static kmem_cache_t * jfs_inode_cachep;
  45
  46 static struct super_operations jfs_super_operations;
  47 static struct export_operations jfs_export_operations;
  48 static struct file_system_type jfs_fs_type;
  49
  50 #define MAX_COMMIT_THREADS 64
  51 static int commit_threads = 0;
  52 module_param(commit_threads, int, 0);
  53 MODULE_PARM_DESC(commit_threads, "Number of commit threads");
  54
  55 int jfs_stop_threads;
  56 static pid_t jfsIOthread;
  57 static pid_t jfsCommitThread[MAX_COMMIT_THREADS];
  58 static pid_t jfsSyncThread;
  59 DECLARE_COMPLETION(jfsIOwait);
  60
  61 #ifdef CONFIG_JFS_DEBUG
  62 int jfsloglevel = JFS_LOGLEVEL_WARN;
  63 module_param(jfsloglevel, int, 0644);
  64 MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
  65 #endif
  66
  67 static void jfs_handle_error(struct super_block *sb)
  68 {
  69         struct jfs_sb_info *sbi = JFS_SBI(sb);
  70
  71         if (sb->s_flags & MS_RDONLY)
  72                 return;
  73
  74         updateSuper(sb, FM_DIRTY);
  75
  76         if (sbi->flag & JFS_ERR_PANIC)
  77                 panic("JFS (device %s): panic forced after error\n",
  78                         sb->s_id);
  79         else if (sbi->flag & JFS_ERR_REMOUNT_RO) {
  80                 jfs_err("ERROR: (device %s): remounting filesystem "
  81                         "as read-only\n",
  82                         sb->s_id);
  83                 sb->s_flags |= MS_RDONLY;
  84         }
  85
  86         /* nothing is done for continue beyond marking the superblock dirty */
  87 }
  88
  89 void jfs_error(struct super_block *sb, const char * function, ...)
  90 {
  91         static char error_buf[256];
  92         va_list args;
  93
  94         va_start(args, function);
  95         vsprintf(error_buf, function, args);
  96         va_end(args);
  97
  98         printk(KERN_ERR "ERROR: (device %s): %s\n", sb->s_id, error_buf);
  99
 100         jfs_handle_error(sb);
 101 }
 102
 103 static struct inode *jfs_alloc_inode(struct super_block *sb)
 104 {
 105         struct jfs_inode_info *jfs_inode;
 106
 107         jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS);
 108         if (!jfs_inode)
 109                 return NULL;
 110         return &jfs_inode->vfs_inode;
 111 }
 112
 113 static void jfs_destroy_inode(struct inode *inode)
 114 {
 115         struct jfs_inode_info *ji = JFS_IP(inode);
 116
 117         BUG_ON(!list_empty(&ji->anon_inode_list));
 118
 119         spin_lock_irq(&ji->ag_lock);
 120         if (ji->active_ag != -1) {
 121                 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
 122                 atomic_dec(&bmap->db_active[ji->active_ag]);
 123                 ji->active_ag = -1;
 124         }
 125         spin_unlock_irq(&ji->ag_lock);
 126
 127 #ifdef CONFIG_JFS_POSIX_ACL
 128         if (ji->i_acl != JFS_ACL_NOT_CACHED) {
 129                 posix_acl_release(ji->i_acl);
 130                 ji->i_acl = JFS_ACL_NOT_CACHED;
 131         }
 132         if (ji->i_default_acl != JFS_ACL_NOT_CACHED) {
 133                 posix_acl_release(ji->i_default_acl);
 134                 ji->i_default_acl = JFS_ACL_NOT_CACHED;
 135         }
 136 #endif
 137
 138         kmem_cache_free(jfs_inode_cachep, ji);
 139 }
 140
 141 static int jfs_statfs(struct super_block *sb, struct kstatfs *buf)
 142 {
 143         struct jfs_sb_info *sbi = JFS_SBI(sb);
 144         s64 maxinodes;
 145         struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
 146
 147         jfs_info("In jfs_statfs");
 148         buf->f_type = JFS_SUPER_MAGIC;
 149         buf->f_bsize = sbi->bsize;
 150         buf->f_blocks = sbi->bmap->db_mapsize;
 151         buf->f_bfree = sbi->bmap->db_nfree;
 152         buf->f_bavail = sbi->bmap->db_nfree;
 153         /*
 154          * If we really return the number of allocated & free inodes, some
 155          * applications will fail because they won't see enough free inodes.
 156          * We'll try to calculate some guess as to how may inodes we can
 157          * really allocate
 158          *
 159          * buf->f_files = atomic_read(&imap->im_numinos);
 160          * buf->f_ffree = atomic_read(&imap->im_numfree);
 161          */
 162         maxinodes = min((s64) atomic_read(&imap->im_numinos) +
 163                         ((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
 164                          << L2INOSPEREXT), (s64) 0xffffffffLL);
 165         buf->f_files = maxinodes;
 166         buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
 167                                     atomic_read(&imap->im_numfree));
 168
 169         buf->f_namelen = JFS_NAME_MAX;
 170         return 0;
 171 }
 172
 173 static void jfs_put_super(struct super_block *sb)
 174 {
 175         struct jfs_sb_info *sbi = JFS_SBI(sb);
 176         int rc;
 177
 178         jfs_info("In jfs_put_super");
 179         rc = jfs_umount(sb);
 180         if (rc)
 181                 jfs_err("jfs_umount failed with return code %d", rc);
 182         if (sbi->nls_tab)
 183                 unload_nls(sbi->nls_tab);
 184         sbi->nls_tab = NULL;
 185
 186         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
 187         iput(sbi->direct_inode);
 188         sbi->direct_inode = NULL;
 189
 190         kfree(sbi);
 191 }
 192
 193 enum {
 194         Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
 195         Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err,
 196 };
 197
 198 static match_table_t tokens = {
 199         {Opt_integrity, "integrity"},
 200         {Opt_nointegrity, "nointegrity"},
 201         {Opt_iocharset, "iocharset=%s"},
 202         {Opt_resize, "resize=%u"},
 203         {Opt_resize_nosize, "resize"},
 204         {Opt_errors, "errors=%s"},
 205         {Opt_ignore, "noquota"},
 206         {Opt_ignore, "quota"},
 207         {Opt_ignore, "usrquota"},
 208         {Opt_ignore, "grpquota"},
 209         {Opt_err, NULL}
 210 };
 211
 212 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
 213                          int *flag)
 214 {
 215         void *nls_map = (void *)-1;     /* -1: no change;  NULL: none */
 216         char *p;
 217         struct jfs_sb_info *sbi = JFS_SBI(sb);
 218
 219         *newLVSize = 0;
 220
 221         if (!options)
 222                 return 1;
 223
 224         while ((p = strsep(&options, ",")) != NULL) {
 225                 substring_t args[MAX_OPT_ARGS];
 226                 int token;
 227                 if (!*p)
 228                         continue;
 229
 230                 token = match_token(p, tokens, args);
 231                 switch (token) {
 232                 case Opt_integrity:
 233                         *flag &= ~JFS_NOINTEGRITY;
 234                         break;
 235                 case Opt_nointegrity:
 236                         *flag |= JFS_NOINTEGRITY;
 237                         break;
 238                 case Opt_ignore:
 239                         /* Silently ignore the quota options */
 240                         /* Don't do anything ;-) */
 241                         break;
 242                 case Opt_iocharset:
 243                         if (nls_map && nls_map != (void *) -1)
 244                                 unload_nls(nls_map);
 245                         if (!strcmp(args[0].from, "none"))
 246                                 nls_map = NULL;
 247                         else {
 248                                 nls_map = load_nls(args[0].from);
 249                                 if (!nls_map) {
 250                                         printk(KERN_ERR
 251                                                "JFS: charset not found\n");
 252                                         goto cleanup;
 253                                 }
 254                         }
 255                         break;
 256                 case Opt_resize:
 257                 {
 258                         char *resize = args[0].from;
 259                         *newLVSize = simple_strtoull(resize, &resize, 0);
 260                         break;
 261                 }
 262                 case Opt_resize_nosize:
 263                 {
 264                         *newLVSize = sb->s_bdev->bd_inode->i_size >>
 265                                 sb->s_blocksize_bits;
 266                         if (*newLVSize == 0)
 267                                 printk(KERN_ERR
 268                                        "JFS: Cannot determine volume size\n");
 269                         break;
 270                 }
 271                 case Opt_errors:
 272                 {
 273                         char *errors = args[0].from;
 274                         if (!errors || !*errors)
 275                                 goto cleanup;
 276                         if (!strcmp(errors, "continue")) {
 277                                 *flag &= ~JFS_ERR_REMOUNT_RO;
 278                                 *flag &= ~JFS_ERR_PANIC;
 279                                 *flag |= JFS_ERR_CONTINUE;
 280                         } else if (!strcmp(errors, "remount-ro")) {
 281                                 *flag &= ~JFS_ERR_CONTINUE;
 282                                 *flag &= ~JFS_ERR_PANIC;
 283                                 *flag |= JFS_ERR_REMOUNT_RO;
 284                         } else if (!strcmp(errors, "panic")) {
 285                                 *flag &= ~JFS_ERR_CONTINUE;
 286                                 *flag &= ~JFS_ERR_REMOUNT_RO;
 287                                 *flag |= JFS_ERR_PANIC;
 288                         } else {
 289                                 printk(KERN_ERR
 290                                        "JFS: %s is an invalid error handler\n",
 291                                        errors);
 292                                 goto cleanup;
 293                         }
 294                         break;
 295                 }
 296                 default:
 297                         printk("jfs: Unrecognized mount option \"%s\" "
 298                                         " or missing value\n", p);
 299                         goto cleanup;
 300                 }
 301         }
 302
 303         if (nls_map != (void *) -1) {
 304                 /* Discard old (if remount) */
 305                 if (sbi->nls_tab)
 306                         unload_nls(sbi->nls_tab);
 307                 sbi->nls_tab = nls_map;
 308         }
 309         return 1;
 310
 311 cleanup:
 312         if (nls_map && nls_map != (void *) -1)
 313                 unload_nls(nls_map);
 314         return 0;
 315 }
 316
 317 static int jfs_remount(struct super_block *sb, int *flags, char *data)
 318 {
 319         s64 newLVSize = 0;
 320         int rc = 0;
 321         int flag = JFS_SBI(sb)->flag;
 322
 323         if (!parse_options(data, sb, &newLVSize, &flag)) {
 324                 return -EINVAL;
 325         }
 326         if (newLVSize) {
 327                 if (sb->s_flags & MS_RDONLY) {
 328                         printk(KERN_ERR
 329                   "JFS: resize requires volume to be mounted read-write\n");
 330                         return -EROFS;
 331                 }
 332                 rc = jfs_extendfs(sb, newLVSize, 0);
 333                 if (rc)
 334                         return rc;
 335         }
 336
 337         if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
 338                 /*
 339                  * Invalidate any previously read metadata.  fsck may have
 340                  * changed the on-disk data since we mounted r/o
 341                  */
 342                 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
 343
 344                 JFS_SBI(sb)->flag = flag;
 345                 return jfs_mount_rw(sb, 1);
 346         }
 347         if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
 348                 rc = jfs_umount_rw(sb);
 349                 JFS_SBI(sb)->flag = flag;
 350                 return rc;
 351         }
 352         if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
 353                 if (!(sb->s_flags & MS_RDONLY)) {
 354                         rc = jfs_umount_rw(sb);
 355                         if (rc)
 356                                 return rc;
 357                         JFS_SBI(sb)->flag = flag;
 358                         return jfs_mount_rw(sb, 1);
 359                 }
 360         JFS_SBI(sb)->flag = flag;
 361
 362         return 0;
 363 }
 364
 365 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
 366 {
 367         struct jfs_sb_info *sbi;
 368         struct inode *inode;
 369         int rc;
 370         s64 newLVSize = 0;
 371         int flag;
 372
 373         jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
 374
 375         if (!new_valid_dev(sb->s_bdev->bd_dev))
 376                 return -EOVERFLOW;
 377
 378         sbi = kmalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
 379         if (!sbi)
 380                 return -ENOSPC;
 381         memset(sbi, 0, sizeof (struct jfs_sb_info));
 382         sb->s_fs_info = sbi;
 383         sbi->sb = sb;
 384
 385         /* initialize the mount flag and determine the default error handler */
 386         flag = JFS_ERR_REMOUNT_RO;
 387
 388         if (!parse_options((char *) data, sb, &newLVSize, &flag)) {
 389                 kfree(sbi);
 390                 return -EINVAL;
 391         }
 392         sbi->flag = flag;
 393
 394 #ifdef CONFIG_JFS_POSIX_ACL
 395         sb->s_flags |= MS_POSIXACL;
 396 #endif
 397
 398         if (newLVSize) {
 399                 printk(KERN_ERR "resize option for remount only\n");
 400                 return -EINVAL;
 401         }
 402
 403         /*
 404          * Initialize blocksize to 4K.
 405          */
 406         sb_set_blocksize(sb, PSIZE);
 407
 408         /*
 409          * Set method vectors.
 410          */
 411         sb->s_op = &jfs_super_operations;
 412         sb->s_export_op = &jfs_export_operations;
 413
 414         /*
 415          * Initialize direct-mapping inode/address-space
 416          */
 417         inode = new_inode(sb);
 418         if (inode == NULL)
 419                 goto out_kfree;
 420         inode->i_ino = 0;
 421         inode->i_nlink = 1;
 422         inode->i_size = sb->s_bdev->bd_inode->i_size;
 423         inode->i_mapping->a_ops = &jfs_metapage_aops;
 424         mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
 425
 426         sbi->direct_inode = inode;
 427
 428         rc = jfs_mount(sb);
 429         if (rc) {
 430                 if (!silent) {
 431                         jfs_err("jfs_mount failed w/return code = %d", rc);
 432                 }
 433                 goto out_mount_failed;
 434         }
 435         if (sb->s_flags & MS_RDONLY)
 436                 sbi->log = NULL;
 437         else {
 438                 rc = jfs_mount_rw(sb, 0);
 439                 if (rc) {
 440                         if (!silent) {
 441                                 jfs_err("jfs_mount_rw failed, return code = %d",
 442                                         rc);
 443                         }
 444                         goto out_no_rw;
 445                 }
 446         }
 447
 448         sb->s_magic = JFS_SUPER_MAGIC;
 449
 450         inode = iget(sb, ROOT_I);
 451         if (!inode || is_bad_inode(inode))
 452                 goto out_no_root;
 453         sb->s_root = d_alloc_root(inode);
 454         if (!sb->s_root)
 455                 goto out_no_root;
 456
 457         if (sbi->mntflag & JFS_OS2)
 458                 sb->s_root->d_op = &jfs_ci_dentry_operations;
 459
 460         /* logical blocks are represented by 40 bits in pxd_t, etc. */
 461         sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
 462 #if BITS_PER_LONG == 32
 463         /*
 464          * Page cache is indexed by long.
 465          * I would use MAX_LFS_FILESIZE, but it's only half as big
 466          */
 467         sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, sb->s_maxbytes);
 468 #endif
 469         sb->s_time_gran = 1;
 470         return 0;
 471
 472 out_no_root:
 473         jfs_err("jfs_read_super: get root inode failed");
 474         if (inode)
 475                 iput(inode);
 476
 477 out_no_rw:
 478         rc = jfs_umount(sb);
 479         if (rc) {
 480                 jfs_err("jfs_umount failed with return code %d", rc);
 481         }
 482 out_mount_failed:
 483         filemap_fdatawrite(sbi->direct_inode->i_mapping);
 484         filemap_fdatawait(sbi->direct_inode->i_mapping);
 485         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
 486         make_bad_inode(sbi->direct_inode);
 487         iput(sbi->direct_inode);
 488         sbi->direct_inode = NULL;
 489 out_kfree:
 490         if (sbi->nls_tab)
 491                 unload_nls(sbi->nls_tab);
 492         kfree(sbi);
 493         return -EINVAL;
 494 }
 495
 496 static void jfs_write_super_lockfs(struct super_block *sb)
 497 {
 498         struct jfs_sb_info *sbi = JFS_SBI(sb);
 499         struct jfs_log *log = sbi->log;
 500
 501         if (!(sb->s_flags & MS_RDONLY)) {
 502                 txQuiesce(sb);
 503                 lmLogShutdown(log);
 504                 updateSuper(sb, FM_CLEAN);
 505         }
 506 }
 507
 508 static void jfs_unlockfs(struct super_block *sb)
 509 {
 510         struct jfs_sb_info *sbi = JFS_SBI(sb);
 511         struct jfs_log *log = sbi->log;
 512         int rc = 0;
 513
 514         if (!(sb->s_flags & MS_RDONLY)) {
 515                 updateSuper(sb, FM_MOUNT);
 516                 if ((rc = lmLogInit(log)))
 517                         jfs_err("jfs_unlock failed with return code %d", rc);
 518                 else
 519                         txResume(sb);
 520         }
 521 }
 522
 523 static struct super_block *jfs_get_sb(struct file_system_type *fs_type,
 524         int flags, const char *dev_name, void *data)
 525 {
 526         return get_sb_bdev(fs_type, flags, dev_name, data, jfs_fill_super);
 527 }
 528
 529 static int jfs_sync_fs(struct super_block *sb, int wait)
 530 {
 531         struct jfs_log *log = JFS_SBI(sb)->log;
 532
 533         /* log == NULL indicates read-only mount */
 534         if (log) {
 535                 jfs_flush_journal(log, wait);
 536                 jfs_syncpt(log, 0);
 537         }
 538
 539         return 0;
 540 }
 541
 542 static struct super_operations jfs_super_operations = {
 543         .alloc_inode    = jfs_alloc_inode,
 544         .destroy_inode  = jfs_destroy_inode,
 545         .read_inode     = jfs_read_inode,
 546         .dirty_inode    = jfs_dirty_inode,
 547         .write_inode    = jfs_write_inode,
 548         .delete_inode   = jfs_delete_inode,
 549         .put_super      = jfs_put_super,
 550         .sync_fs        = jfs_sync_fs,
 551         .write_super_lockfs = jfs_write_super_lockfs,
 552         .unlockfs       = jfs_unlockfs,
 553         .statfs         = jfs_statfs,
 554         .remount_fs     = jfs_remount,
 555 };
 556
 557 static struct export_operations jfs_export_operations = {
 558         .get_parent     = jfs_get_parent,
 559 };
 560
 561 static struct file_system_type jfs_fs_type = {
 562         .owner          = THIS_MODULE,
 563         .name           = "jfs",
 564         .get_sb         = jfs_get_sb,
 565         .kill_sb        = kill_block_super,
 566         .fs_flags       = FS_REQUIRES_DEV,
 567 };
 568
 569 static void init_once(void *foo, kmem_cache_t * cachep, unsigned long flags)
 570 {
 571         struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
 572
 573         if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
 574             SLAB_CTOR_CONSTRUCTOR) {
 575                 memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
 576                 INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
 577                 init_rwsem(&jfs_ip->rdwrlock);
 578                 init_MUTEX(&jfs_ip->commit_sem);
 579                 init_rwsem(&jfs_ip->xattr_sem);
 580                 spin_lock_init(&jfs_ip->ag_lock);
 581                 jfs_ip->active_ag = -1;
 582 #ifdef CONFIG_JFS_POSIX_ACL
 583                 jfs_ip->i_acl = JFS_ACL_NOT_CACHED;
 584                 jfs_ip->i_default_acl = JFS_ACL_NOT_CACHED;
 585 #endif
 586                 inode_init_once(&jfs_ip->vfs_inode);
 587         }
 588 }
 589
 590 static int __init init_jfs_fs(void)
 591 {
 592         int i;
 593         int rc;
 594
 595         jfs_inode_cachep =
 596             kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
 597                             SLAB_RECLAIM_ACCOUNT, init_once, NULL);
 598         if (jfs_inode_cachep == NULL)
 599                 return -ENOMEM;
 600
 601         /*
 602          * Metapage initialization
 603          */
 604         rc = metapage_init();
 605         if (rc) {
 606                 jfs_err("metapage_init failed w/rc = %d", rc);
 607                 goto free_slab;
 608         }
 609
 610         /*
 611          * Transaction Manager initialization
 612          */
 613         rc = txInit();
 614         if (rc) {
 615                 jfs_err("txInit failed w/rc = %d", rc);
 616                 goto free_metapage;
 617         }
 618
 619         /*
 620          * I/O completion thread (endio)
 621          */
 622         jfsIOthread = kernel_thread(jfsIOWait, NULL, CLONE_KERNEL);
 623         if (jfsIOthread < 0) {
 624                 jfs_err("init_jfs_fs: fork failed w/rc = %d", jfsIOthread);
 625                 goto end_txmngr;
 626         }
 627         wait_for_completion(&jfsIOwait);        /* Wait until thread starts */
 628
 629         if (commit_threads < 1)
 630                 commit_threads = num_online_cpus();
 631         if (commit_threads > MAX_COMMIT_THREADS)
 632                 commit_threads = MAX_COMMIT_THREADS;
 633
 634         for (i = 0; i < commit_threads; i++) {
 635                 jfsCommitThread[i] = kernel_thread(jfs_lazycommit, NULL,
 636                                                    CLONE_KERNEL);
 637                 if (jfsCommitThread[i] < 0) {
 638                         jfs_err("init_jfs_fs: fork failed w/rc = %d",
 639                                 jfsCommitThread[i]);
 640                         commit_threads = i;
 641                         goto kill_committask;
 642                 }
 643                 /* Wait until thread starts */
 644                 wait_for_completion(&jfsIOwait);
 645         }
 646
 647         jfsSyncThread = kernel_thread(jfs_sync, NULL, CLONE_KERNEL);
 648         if (jfsSyncThread < 0) {
 649                 jfs_err("init_jfs_fs: fork failed w/rc = %d", jfsSyncThread);
 650                 goto kill_committask;
 651         }
 652         wait_for_completion(&jfsIOwait);        /* Wait until thread starts */
 653
 654 #ifdef PROC_FS_JFS
 655         jfs_proc_init();
 656 #endif
 657
 658         return register_filesystem(&jfs_fs_type);
 659
 660 kill_committask:
 661         jfs_stop_threads = 1;
 662         wake_up_all(&jfs_commit_thread_wait);
 663         for (i = 0; i < commit_threads; i++)
 664                 wait_for_completion(&jfsIOwait);
 665
 666         wake_up(&jfs_IO_thread_wait);
 667         wait_for_completion(&jfsIOwait);        /* Wait for thread exit */
 668 end_txmngr:
 669         txExit();
 670 free_metapage:
 671         metapage_exit();
 672 free_slab:
 673         kmem_cache_destroy(jfs_inode_cachep);
 674         return rc;
 675 }
 676
 677 static void __exit exit_jfs_fs(void)
 678 {
 679         int i;
 680
 681         jfs_info("exit_jfs_fs called");
 682
 683         jfs_stop_threads = 1;
 684         txExit();
 685         metapage_exit();
 686         wake_up(&jfs_IO_thread_wait);
 687         wait_for_completion(&jfsIOwait);        /* Wait until IO thread exits */
 688         wake_up_all(&jfs_commit_thread_wait);
 689         for (i = 0; i < commit_threads; i++)
 690                 wait_for_completion(&jfsIOwait);
 691         wake_up(&jfs_sync_thread_wait);
 692         wait_for_completion(&jfsIOwait);        /* Wait until Sync thread exits */
 693 #ifdef PROC_FS_JFS
 694         jfs_proc_clean();
 695 #endif
 696         unregister_filesystem(&jfs_fs_type);
 697         kmem_cache_destroy(jfs_inode_cachep);
 698 }
 699
 700 module_init(init_jfs_fs)
 701 module_exit(exit_jfs_fs)