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/mount.h>
  27 #include <linux/moduleparam.h>
  28 #include <linux/kthread.h>
  29 #include <linux/posix_acl.h>
  30 #include <asm/uaccess.h>
  31 #include <linux/seq_file.h>
  32
  33 #include "jfs_incore.h"
  34 #include "jfs_filsys.h"
  35 #include "jfs_inode.h"
  36 #include "jfs_metapage.h"
  37 #include "jfs_superblock.h"
  38 #include "jfs_dmap.h"
  39 #include "jfs_imap.h"
  40 #include "jfs_acl.h"
  41 #include "jfs_debug.h"
  42
  43 MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
  44 MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
  45 MODULE_LICENSE("GPL");
  46
  47 static kmem_cache_t * jfs_inode_cachep;
  48
  49 static struct super_operations jfs_super_operations;
  50 static struct export_operations jfs_export_operations;
  51 static struct file_system_type jfs_fs_type;
  52
  53 #define MAX_COMMIT_THREADS 64
  54 static int commit_threads = 0;
  55 module_param(commit_threads, int, 0);
  56 MODULE_PARM_DESC(commit_threads, "Number of commit threads");
  57
  58 static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS];
  59 struct task_struct *jfsIOthread;
  60 struct task_struct *jfsSyncThread;
  61
  62 #ifdef CONFIG_JFS_DEBUG
  63 int jfsloglevel = JFS_LOGLEVEL_WARN;
  64 module_param(jfsloglevel, int, 0644);
  65 MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
  66 #endif
  67
  68 static void jfs_handle_error(struct super_block *sb)
  69 {
  70         struct jfs_sb_info *sbi = JFS_SBI(sb);
  71
  72         if (sb->s_flags & MS_RDONLY)
  73                 return;
  74
  75         updateSuper(sb, FM_DIRTY);
  76
  77         if (sbi->flag & JFS_ERR_PANIC)
  78                 panic("JFS (device %s): panic forced after error\n",
  79                         sb->s_id);
  80         else if (sbi->flag & JFS_ERR_REMOUNT_RO) {
  81                 jfs_err("ERROR: (device %s): remounting filesystem "
  82                         "as read-only\n",
  83                         sb->s_id);
  84                 sb->s_flags |= MS_RDONLY;
  85         }
  86
  87         /* nothing is done for continue beyond marking the superblock dirty */
  88 }
  89
  90 void jfs_error(struct super_block *sb, const char * function, ...)
  91 {
  92         static char error_buf[256];
  93         va_list args;
  94
  95         va_start(args, function);
  96         vsprintf(error_buf, function, args);
  97         va_end(args);
  98
  99         printk(KERN_ERR "ERROR: (device %s): %s\n", sb->s_id, error_buf);
 100
 101         jfs_handle_error(sb);
 102 }
 103
 104 static struct inode *jfs_alloc_inode(struct super_block *sb)
 105 {
 106         struct jfs_inode_info *jfs_inode;
 107
 108         jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS);
 109         if (!jfs_inode)
 110                 return NULL;
 111         return &jfs_inode->vfs_inode;
 112 }
 113
 114 static void jfs_destroy_inode(struct inode *inode)
 115 {
 116         struct jfs_inode_info *ji = JFS_IP(inode);
 117
 118         BUG_ON(!list_empty(&ji->anon_inode_list));
 119
 120         spin_lock_irq(&ji->ag_lock);
 121         if (ji->active_ag != -1) {
 122                 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
 123                 atomic_dec(&bmap->db_active[ji->active_ag]);
 124                 ji->active_ag = -1;
 125         }
 126         spin_unlock_irq(&ji->ag_lock);
 127
 128 #ifdef CONFIG_JFS_POSIX_ACL
 129         if (ji->i_acl != JFS_ACL_NOT_CACHED) {
 130                 posix_acl_release(ji->i_acl);
 131                 ji->i_acl = JFS_ACL_NOT_CACHED;
 132         }
 133         if (ji->i_default_acl != JFS_ACL_NOT_CACHED) {
 134                 posix_acl_release(ji->i_default_acl);
 135                 ji->i_default_acl = JFS_ACL_NOT_CACHED;
 136         }
 137 #endif
 138
 139         kmem_cache_free(jfs_inode_cachep, ji);
 140 }
 141
 142 static int jfs_statfs(struct super_block *sb, struct kstatfs *buf)
 143 {
 144         struct jfs_sb_info *sbi = JFS_SBI(sb);
 145         s64 maxinodes;
 146         struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
 147
 148         jfs_info("In jfs_statfs");
 149         buf->f_type = JFS_SUPER_MAGIC;
 150         buf->f_bsize = sbi->bsize;
 151         buf->f_blocks = sbi->bmap->db_mapsize;
 152         buf->f_bfree = sbi->bmap->db_nfree;
 153         buf->f_bavail = sbi->bmap->db_nfree;
 154         /*
 155          * If we really return the number of allocated & free inodes, some
 156          * applications will fail because they won't see enough free inodes.
 157          * We'll try to calculate some guess as to how may inodes we can
 158          * really allocate
 159          *
 160          * buf->f_files = atomic_read(&imap->im_numinos);
 161          * buf->f_ffree = atomic_read(&imap->im_numfree);
 162          */
 163         maxinodes = min((s64) atomic_read(&imap->im_numinos) +
 164                         ((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
 165                          << L2INOSPEREXT), (s64) 0xffffffffLL);
 166         buf->f_files = maxinodes;
 167         buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
 168                                     atomic_read(&imap->im_numfree));
 169
 170         buf->f_namelen = JFS_NAME_MAX;
 171         return 0;
 172 }
 173
 174 static void jfs_put_super(struct super_block *sb)
 175 {
 176         struct jfs_sb_info *sbi = JFS_SBI(sb);
 177         int rc;
 178
 179         jfs_info("In jfs_put_super");
 180         rc = jfs_umount(sb);
 181         if (rc)
 182                 jfs_err("jfs_umount failed with return code %d", rc);
 183         if (sbi->nls_tab)
 184                 unload_nls(sbi->nls_tab);
 185         sbi->nls_tab = NULL;
 186
 187         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
 188         iput(sbi->direct_inode);
 189         sbi->direct_inode = NULL;
 190
 191         kfree(sbi);
 192 }
 193
 194 enum {
 195         Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
 196         Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota,
 197         Opt_usrquota, Opt_grpquota
 198 };
 199
 200 static match_table_t tokens = {
 201         {Opt_integrity, "integrity"},
 202         {Opt_nointegrity, "nointegrity"},
 203         {Opt_iocharset, "iocharset=%s"},
 204         {Opt_resize, "resize=%u"},
 205         {Opt_resize_nosize, "resize"},
 206         {Opt_errors, "errors=%s"},
 207         {Opt_ignore, "noquota"},
 208         {Opt_ignore, "quota"},
 209         {Opt_usrquota, "usrquota"},
 210         {Opt_grpquota, "grpquota"},
 211         {Opt_err, NULL}
 212 };
 213
 214 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
 215                          int *flag)
 216 {
 217         void *nls_map = (void *)-1;     /* -1: no change;  NULL: none */
 218         char *p;
 219         struct jfs_sb_info *sbi = JFS_SBI(sb);
 220
 221         *newLVSize = 0;
 222
 223         if (!options)
 224                 return 1;
 225
 226         while ((p = strsep(&options, ",")) != NULL) {
 227                 substring_t args[MAX_OPT_ARGS];
 228                 int token;
 229                 if (!*p)
 230                         continue;
 231
 232                 token = match_token(p, tokens, args);
 233                 switch (token) {
 234                 case Opt_integrity:
 235                         *flag &= ~JFS_NOINTEGRITY;
 236                         break;
 237                 case Opt_nointegrity:
 238                         *flag |= JFS_NOINTEGRITY;
 239                         break;
 240                 case Opt_ignore:
 241                         /* Silently ignore the quota options */
 242                         /* Don't do anything ;-) */
 243                         break;
 244                 case Opt_iocharset:
 245                         if (nls_map && nls_map != (void *) -1)
 246                                 unload_nls(nls_map);
 247                         if (!strcmp(args[0].from, "none"))
 248                                 nls_map = NULL;
 249                         else {
 250                                 nls_map = load_nls(args[0].from);
 251                                 if (!nls_map) {
 252                                         printk(KERN_ERR
 253                                                "JFS: charset not found\n");
 254                                         goto cleanup;
 255                                 }
 256                         }
 257                         break;
 258                 case Opt_resize:
 259                 {
 260                         char *resize = args[0].from;
 261                         *newLVSize = simple_strtoull(resize, &resize, 0);
 262                         break;
 263                 }
 264                 case Opt_resize_nosize:
 265                 {
 266                         *newLVSize = sb->s_bdev->bd_inode->i_size >>
 267                                 sb->s_blocksize_bits;
 268                         if (*newLVSize == 0)
 269                                 printk(KERN_ERR
 270                                        "JFS: Cannot determine volume size\n");
 271                         break;
 272                 }
 273                 case Opt_errors:
 274                 {
 275                         char *errors = args[0].from;
 276                         if (!errors || !*errors)
 277                                 goto cleanup;
 278                         if (!strcmp(errors, "continue")) {
 279                                 *flag &= ~JFS_ERR_REMOUNT_RO;
 280                                 *flag &= ~JFS_ERR_PANIC;
 281                                 *flag |= JFS_ERR_CONTINUE;
 282                         } else if (!strcmp(errors, "remount-ro")) {
 283                                 *flag &= ~JFS_ERR_CONTINUE;
 284                                 *flag &= ~JFS_ERR_PANIC;
 285                                 *flag |= JFS_ERR_REMOUNT_RO;
 286                         } else if (!strcmp(errors, "panic")) {
 287                                 *flag &= ~JFS_ERR_CONTINUE;
 288                                 *flag &= ~JFS_ERR_REMOUNT_RO;
 289                                 *flag |= JFS_ERR_PANIC;
 290                         } else {
 291                                 printk(KERN_ERR
 292                                        "JFS: %s is an invalid error handler\n",
 293                                        errors);
 294                                 goto cleanup;
 295                         }
 296                         break;
 297                 }
 298
 299 #if defined(CONFIG_QUOTA)
 300                 case Opt_quota:
 301                 case Opt_usrquota:
 302                         *flag |= JFS_USRQUOTA;
 303                         break;
 304                 case Opt_grpquota:
 305                         *flag |= JFS_GRPQUOTA;
 306                         break;
 307 #else
 308                 case Opt_usrquota:
 309                 case Opt_grpquota:
 310                 case Opt_quota:
 311                         printk(KERN_ERR
 312                                "JFS: quota operations not supported\n");
 313                         break;
 314 #endif
 315
 316                 default:
 317                         printk("jfs: Unrecognized mount option \"%s\" "
 318                                         " or missing value\n", p);
 319                         goto cleanup;
 320                 }
 321         }
 322
 323         if (nls_map != (void *) -1) {
 324                 /* Discard old (if remount) */
 325                 if (sbi->nls_tab)
 326                         unload_nls(sbi->nls_tab);
 327                 sbi->nls_tab = nls_map;
 328         }
 329         return 1;
 330
 331 cleanup:
 332         if (nls_map && nls_map != (void *) -1)
 333                 unload_nls(nls_map);
 334         return 0;
 335 }
 336
 337 static int jfs_remount(struct super_block *sb, int *flags, char *data)
 338 {
 339         s64 newLVSize = 0;
 340         int rc = 0;
 341         int flag = JFS_SBI(sb)->flag;
 342
 343         if (!parse_options(data, sb, &newLVSize, &flag)) {
 344                 return -EINVAL;
 345         }
 346         if (newLVSize) {
 347                 if (sb->s_flags & MS_RDONLY) {
 348                         printk(KERN_ERR
 349                   "JFS: resize requires volume to be mounted read-write\n");
 350                         return -EROFS;
 351                 }
 352                 rc = jfs_extendfs(sb, newLVSize, 0);
 353                 if (rc)
 354                         return rc;
 355         }
 356
 357         if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
 358                 /*
 359                  * Invalidate any previously read metadata.  fsck may have
 360                  * changed the on-disk data since we mounted r/o
 361                  */
 362                 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
 363
 364                 JFS_SBI(sb)->flag = flag;
 365                 return jfs_mount_rw(sb, 1);
 366         }
 367         if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
 368                 rc = jfs_umount_rw(sb);
 369                 JFS_SBI(sb)->flag = flag;
 370                 return rc;
 371         }
 372         if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
 373                 if (!(sb->s_flags & MS_RDONLY)) {
 374                         rc = jfs_umount_rw(sb);
 375                         if (rc)
 376                                 return rc;
 377                         JFS_SBI(sb)->flag = flag;
 378                         return jfs_mount_rw(sb, 1);
 379                 }
 380         JFS_SBI(sb)->flag = flag;
 381
 382         return 0;
 383 }
 384
 385 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
 386 {
 387         struct jfs_sb_info *sbi;
 388         struct inode *inode;
 389         int rc;
 390         s64 newLVSize = 0;
 391         int flag;
 392
 393         jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
 394
 395         if (!new_valid_dev(sb->s_bdev->bd_dev))
 396                 return -EOVERFLOW;
 397
 398         sbi = kzalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
 399         if (!sbi)
 400                 return -ENOSPC;
 401         sb->s_fs_info = sbi;
 402         sbi->sb = sb;
 403
 404         /* initialize the mount flag and determine the default error handler */
 405         flag = JFS_ERR_REMOUNT_RO;
 406
 407         if (!parse_options((char *) data, sb, &newLVSize, &flag)) {
 408                 kfree(sbi);
 409                 return -EINVAL;
 410         }
 411         sbi->flag = flag;
 412
 413 #ifdef CONFIG_JFS_POSIX_ACL
 414         sb->s_flags |= MS_POSIXACL;
 415 #endif
 416
 417         if (newLVSize) {
 418                 printk(KERN_ERR "resize option for remount only\n");
 419                 return -EINVAL;
 420         }
 421
 422         /*
 423          * Initialize blocksize to 4K.
 424          */
 425         sb_set_blocksize(sb, PSIZE);
 426
 427         /*
 428          * Set method vectors.
 429          */
 430         sb->s_op = &jfs_super_operations;
 431         sb->s_export_op = &jfs_export_operations;
 432
 433         /*
 434          * Initialize direct-mapping inode/address-space
 435          */
 436         inode = new_inode(sb);
 437         if (inode == NULL)
 438                 goto out_kfree;
 439         inode->i_ino = 0;
 440         inode->i_nlink = 1;
 441         inode->i_size = sb->s_bdev->bd_inode->i_size;
 442         inode->i_mapping->a_ops = &jfs_metapage_aops;
 443         insert_inode_hash(inode);
 444         mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
 445
 446         sbi->direct_inode = inode;
 447
 448         rc = jfs_mount(sb);
 449         if (rc) {
 450                 if (!silent) {
 451                         jfs_err("jfs_mount failed w/return code = %d", rc);
 452                 }
 453                 goto out_mount_failed;
 454         }
 455         if (sb->s_flags & MS_RDONLY)
 456                 sbi->log = NULL;
 457         else {
 458                 rc = jfs_mount_rw(sb, 0);
 459                 if (rc) {
 460                         if (!silent) {
 461                                 jfs_err("jfs_mount_rw failed, return code = %d",
 462                                         rc);
 463                         }
 464                         goto out_no_rw;
 465                 }
 466         }
 467
 468         sb->s_magic = JFS_SUPER_MAGIC;
 469
 470         inode = iget(sb, ROOT_I);
 471         if (!inode || is_bad_inode(inode))
 472                 goto out_no_root;
 473         sb->s_root = d_alloc_root(inode);
 474         if (!sb->s_root)
 475                 goto out_no_root;
 476
 477         if (sbi->mntflag & JFS_OS2)
 478                 sb->s_root->d_op = &jfs_ci_dentry_operations;
 479
 480         /* logical blocks are represented by 40 bits in pxd_t, etc. */
 481         sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
 482 #if BITS_PER_LONG == 32
 483         /*
 484          * Page cache is indexed by long.
 485          * I would use MAX_LFS_FILESIZE, but it's only half as big
 486          */
 487         sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, sb->s_maxbytes);
 488 #endif
 489         sb->s_time_gran = 1;
 490         return 0;
 491
 492 out_no_root:
 493         jfs_err("jfs_read_super: get root inode failed");
 494         if (inode)
 495                 iput(inode);
 496
 497 out_no_rw:
 498         rc = jfs_umount(sb);
 499         if (rc) {
 500                 jfs_err("jfs_umount failed with return code %d", rc);
 501         }
 502 out_mount_failed:
 503         filemap_write_and_wait(sbi->direct_inode->i_mapping);
 504         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
 505         make_bad_inode(sbi->direct_inode);
 506         iput(sbi->direct_inode);
 507         sbi->direct_inode = NULL;
 508 out_kfree:
 509         if (sbi->nls_tab)
 510                 unload_nls(sbi->nls_tab);
 511         kfree(sbi);
 512         return -EINVAL;
 513 }
 514
 515 static void jfs_write_super_lockfs(struct super_block *sb)
 516 {
 517         struct jfs_sb_info *sbi = JFS_SBI(sb);
 518         struct jfs_log *log = sbi->log;
 519
 520         if (!(sb->s_flags & MS_RDONLY)) {
 521                 txQuiesce(sb);
 522                 lmLogShutdown(log);
 523                 updateSuper(sb, FM_CLEAN);
 524         }
 525 }
 526
 527 static void jfs_unlockfs(struct super_block *sb)
 528 {
 529         struct jfs_sb_info *sbi = JFS_SBI(sb);
 530         struct jfs_log *log = sbi->log;
 531         int rc = 0;
 532
 533         if (!(sb->s_flags & MS_RDONLY)) {
 534                 updateSuper(sb, FM_MOUNT);
 535                 if ((rc = lmLogInit(log)))
 536                         jfs_err("jfs_unlock failed with return code %d", rc);
 537                 else
 538                         txResume(sb);
 539         }
 540 }
 541
 542 static struct super_block *jfs_get_sb(struct file_system_type *fs_type,
 543         int flags, const char *dev_name, void *data)
 544 {
 545         return get_sb_bdev(fs_type, flags, dev_name, data, jfs_fill_super);
 546 }
 547
 548 static int jfs_sync_fs(struct super_block *sb, int wait)
 549 {
 550         struct jfs_log *log = JFS_SBI(sb)->log;
 551
 552         /* log == NULL indicates read-only mount */
 553         if (log) {
 554                 jfs_flush_journal(log, wait);
 555                 jfs_syncpt(log, 0);
 556         }
 557
 558         return 0;
 559 }
 560
 561 static int jfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
 562 {
 563         struct jfs_sb_info *sbi = JFS_SBI(vfs->mnt_sb);
 564
 565         if (sbi->flag & JFS_NOINTEGRITY)
 566                 seq_puts(seq, ",nointegrity");
 567         else
 568                 seq_puts(seq, ",integrity");
 569
 570 #if defined(CONFIG_QUOTA)
 571         if (sbi->flag & JFS_USRQUOTA)
 572                 seq_puts(seq, ",usrquota");
 573
 574         if (sbi->flag & JFS_GRPQUOTA)
 575                 seq_puts(seq, ",grpquota");
 576 #endif
 577
 578         return 0;
 579 }
 580
 581 static struct super_operations jfs_super_operations = {
 582         .alloc_inode    = jfs_alloc_inode,
 583         .destroy_inode  = jfs_destroy_inode,
 584         .read_inode     = jfs_read_inode,
 585         .dirty_inode    = jfs_dirty_inode,
 586         .write_inode    = jfs_write_inode,
 587         .delete_inode   = jfs_delete_inode,
 588         .put_super      = jfs_put_super,
 589         .sync_fs        = jfs_sync_fs,
 590         .write_super_lockfs = jfs_write_super_lockfs,
 591         .unlockfs       = jfs_unlockfs,
 592         .statfs         = jfs_statfs,
 593         .remount_fs     = jfs_remount,
 594         .show_options   = jfs_show_options
 595 };
 596
 597 static struct export_operations jfs_export_operations = {
 598         .get_parent     = jfs_get_parent,
 599 };
 600
 601 static struct file_system_type jfs_fs_type = {
 602         .owner          = THIS_MODULE,
 603         .name           = "jfs",
 604         .get_sb         = jfs_get_sb,
 605         .kill_sb        = kill_block_super,
 606         .fs_flags       = FS_REQUIRES_DEV,
 607 };
 608
 609 static void init_once(void *foo, kmem_cache_t * cachep, unsigned long flags)
 610 {
 611         struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
 612
 613         if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
 614             SLAB_CTOR_CONSTRUCTOR) {
 615                 memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
 616                 INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
 617                 init_rwsem(&jfs_ip->rdwrlock);
 618                 mutex_init(&jfs_ip->commit_mutex);
 619                 init_rwsem(&jfs_ip->xattr_sem);
 620                 spin_lock_init(&jfs_ip->ag_lock);
 621                 jfs_ip->active_ag = -1;
 622 #ifdef CONFIG_JFS_POSIX_ACL
 623                 jfs_ip->i_acl = JFS_ACL_NOT_CACHED;
 624                 jfs_ip->i_default_acl = JFS_ACL_NOT_CACHED;
 625 #endif
 626                 inode_init_once(&jfs_ip->vfs_inode);
 627         }
 628 }
 629
 630 static int __init init_jfs_fs(void)
 631 {
 632         int i;
 633         int rc;
 634
 635         jfs_inode_cachep =
 636             kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
 637                             SLAB_RECLAIM_ACCOUNT, init_once, NULL);
 638         if (jfs_inode_cachep == NULL)
 639                 return -ENOMEM;
 640
 641         /*
 642          * Metapage initialization
 643          */
 644         rc = metapage_init();
 645         if (rc) {
 646                 jfs_err("metapage_init failed w/rc = %d", rc);
 647                 goto free_slab;
 648         }
 649
 650         /*
 651          * Transaction Manager initialization
 652          */
 653         rc = txInit();
 654         if (rc) {
 655                 jfs_err("txInit failed w/rc = %d", rc);
 656                 goto free_metapage;
 657         }
 658
 659         /*
 660          * I/O completion thread (endio)
 661          */
 662         jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
 663         if (IS_ERR(jfsIOthread)) {
 664                 rc = PTR_ERR(jfsIOthread);
 665                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
 666                 goto end_txmngr;
 667         }
 668
 669         if (commit_threads < 1)
 670                 commit_threads = num_online_cpus();
 671         if (commit_threads > MAX_COMMIT_THREADS)
 672                 commit_threads = MAX_COMMIT_THREADS;
 673
 674         for (i = 0; i < commit_threads; i++) {
 675                 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, "jfsCommit");
 676                 if (IS_ERR(jfsCommitThread[i])) {
 677                         rc = PTR_ERR(jfsCommitThread[i]);
 678                         jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
 679                         commit_threads = i;
 680                         goto kill_committask;
 681                 }
 682         }
 683
 684         jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
 685         if (IS_ERR(jfsSyncThread)) {
 686                 rc = PTR_ERR(jfsSyncThread);
 687                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
 688                 goto kill_committask;
 689         }
 690
 691 #ifdef PROC_FS_JFS
 692         jfs_proc_init();
 693 #endif
 694
 695         return register_filesystem(&jfs_fs_type);
 696
 697 kill_committask:
 698         for (i = 0; i < commit_threads; i++)
 699                 kthread_stop(jfsCommitThread[i]);
 700         kthread_stop(jfsIOthread);
 701 end_txmngr:
 702         txExit();
 703 free_metapage:
 704         metapage_exit();
 705 free_slab:
 706         kmem_cache_destroy(jfs_inode_cachep);
 707         return rc;
 708 }
 709
 710 static void __exit exit_jfs_fs(void)
 711 {
 712         int i;
 713
 714         jfs_info("exit_jfs_fs called");
 715
 716         txExit();
 717         metapage_exit();
 718
 719         kthread_stop(jfsIOthread);
 720         for (i = 0; i < commit_threads; i++)
 721                 kthread_stop(jfsCommitThread[i]);
 722         kthread_stop(jfsSyncThread);
 723 #ifdef PROC_FS_JFS
 724         jfs_proc_clean();
 725 #endif
 726         unregister_filesystem(&jfs_fs_type);
 727         kmem_cache_destroy(jfs_inode_cachep);
 728 }
 729
 730 module_init(init_jfs_fs)
 731 module_exit(exit_jfs_fs)