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   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         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
 214         iput(sbi->direct_inode);
 215         sbi->direct_inode = NULL;
 216
 217         kfree(sbi);
 218 }
 219
 220 enum {
 221         Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
 222         Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err,
 223 };
 224
 225 static match_table_t tokens = {
 226         {Opt_integrity, "integrity"},
 227         {Opt_nointegrity, "nointegrity"},
 228         {Opt_iocharset, "iocharset=%s"},
 229         {Opt_resize, "resize=%u"},
 230         {Opt_resize_nosize, "resize"},
 231         {Opt_errors, "errors=%s"},
 232         {Opt_ignore, "noquota"},
 233         {Opt_ignore, "quota"},
 234         {Opt_ignore, "usrquota"},
 235         {Opt_ignore, "grpquota"},
 236         {Opt_err, NULL}
 237 };
 238
 239 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
 240                          int *flag)
 241 {
 242         void *nls_map = (void *)-1;     /* -1: no change;  NULL: none */
 243         char *p;
 244         struct jfs_sb_info *sbi = JFS_SBI(sb);
 245
 246         *newLVSize = 0;
 247
 248         if (!options)
 249                 return 1;
 250
 251         while ((p = strsep(&options, ",")) != NULL) {
 252                 substring_t args[MAX_OPT_ARGS];
 253                 int token;
 254                 if (!*p)
 255                         continue;
 256
 257                 token = match_token(p, tokens, args);
 258                 switch (token) {
 259                 case Opt_integrity:
 260                         *flag &= ~JFS_NOINTEGRITY;
 261                         break;
 262                 case Opt_nointegrity:
 263                         *flag |= JFS_NOINTEGRITY;
 264                         break;
 265                 case Opt_ignore:
 266                         /* Silently ignore the quota options */
 267                         /* Don't do anything ;-) */
 268                         break;
 269                 case Opt_iocharset:
 270                         if (nls_map && nls_map != (void *) -1)
 271                                 unload_nls(nls_map);
 272                         if (!strcmp(args[0].from, "none"))
 273                                 nls_map = NULL;
 274                         else {
 275                                 nls_map = load_nls(args[0].from);
 276                                 if (!nls_map) {
 277                                         printk(KERN_ERR
 278                                                "JFS: charset not found\n");
 279                                         goto cleanup;
 280                                 }
 281                         }
 282                         break;
 283                 case Opt_resize:
 284                 {
 285                         char *resize = args[0].from;
 286                         *newLVSize = simple_strtoull(resize, &resize, 0);
 287                         break;
 288                 }
 289                 case Opt_resize_nosize:
 290                 {
 291                         *newLVSize = sb->s_bdev->bd_inode->i_size >>
 292                                 sb->s_blocksize_bits;
 293                         if (*newLVSize == 0)
 294                                 printk(KERN_ERR
 295                                        "JFS: Cannot determine volume size\n");
 296                         break;
 297                 }
 298                 case Opt_errors:
 299                 {
 300                         char *errors = args[0].from;
 301                         if (!errors || !*errors)
 302                                 goto cleanup;
 303                         if (!strcmp(errors, "continue")) {
 304                                 *flag &= ~JFS_ERR_REMOUNT_RO;
 305                                 *flag &= ~JFS_ERR_PANIC;
 306                                 *flag |= JFS_ERR_CONTINUE;
 307                         } else if (!strcmp(errors, "remount-ro")) {
 308                                 *flag &= ~JFS_ERR_CONTINUE;
 309                                 *flag &= ~JFS_ERR_PANIC;
 310                                 *flag |= JFS_ERR_REMOUNT_RO;
 311                         } else if (!strcmp(errors, "panic")) {
 312                                 *flag &= ~JFS_ERR_CONTINUE;
 313                                 *flag &= ~JFS_ERR_REMOUNT_RO;
 314                                 *flag |= JFS_ERR_PANIC;
 315                         } else {
 316                                 printk(KERN_ERR
 317                                        "JFS: %s is an invalid error handler\n",
 318                                        errors);
 319                                 goto cleanup;
 320                         }
 321                         break;
 322                 }
 323                 default:
 324                         printk("jfs: Unrecognized mount option \"%s\" "
 325                                         " or missing value\n", p);
 326                         goto cleanup;
 327                 }
 328         }
 329
 330         if (nls_map != (void *) -1) {
 331                 /* Discard old (if remount) */
 332                 if (sbi->nls_tab)
 333                         unload_nls(sbi->nls_tab);
 334                 sbi->nls_tab = nls_map;
 335         }
 336         return 1;
 337
 338 cleanup:
 339         if (nls_map && nls_map != (void *) -1)
 340                 unload_nls(nls_map);
 341         return 0;
 342 }
 343
 344 static int jfs_remount(struct super_block *sb, int *flags, char *data)
 345 {
 346         s64 newLVSize = 0;
 347         int rc = 0;
 348         int flag = JFS_SBI(sb)->flag;
 349
 350         if (!parse_options(data, sb, &newLVSize, &flag)) {
 351                 return -EINVAL;
 352         }
 353         if (newLVSize) {
 354                 if (sb->s_flags & MS_RDONLY) {
 355                         printk(KERN_ERR
 356                   "JFS: resize requires volume to be mounted read-write\n");
 357                         return -EROFS;
 358                 }
 359                 rc = jfs_extendfs(sb, newLVSize, 0);
 360                 if (rc)
 361                         return rc;
 362         }
 363
 364         if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
 365                 /*
 366                  * Invalidate any previously read metadata.  fsck may have
 367                  * changed the on-disk data since we mounted r/o
 368                  */
 369                 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
 370
 371                 JFS_SBI(sb)->flag = flag;
 372                 return jfs_mount_rw(sb, 1);
 373         }
 374         if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
 375                 rc = jfs_umount_rw(sb);
 376                 JFS_SBI(sb)->flag = flag;
 377                 return rc;
 378         }
 379         if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
 380                 if (!(sb->s_flags & MS_RDONLY)) {
 381                         rc = jfs_umount_rw(sb);
 382                         if (rc)
 383                                 return rc;
 384                         JFS_SBI(sb)->flag = flag;
 385                         return jfs_mount_rw(sb, 1);
 386                 }
 387         JFS_SBI(sb)->flag = flag;
 388
 389         return 0;
 390 }
 391
 392 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
 393 {
 394         struct jfs_sb_info *sbi;
 395         struct inode *inode;
 396         int rc;
 397         s64 newLVSize = 0;
 398         int flag;
 399
 400         jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
 401
 402         if (!new_valid_dev(sb->s_bdev->bd_dev))
 403                 return -EOVERFLOW;
 404
 405         sbi = kmalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
 406         if (!sbi)
 407                 return -ENOSPC;
 408         memset(sbi, 0, sizeof (struct jfs_sb_info));
 409         sb->s_fs_info = sbi;
 410         sbi->sb = sb;
 411
 412         /* initialize the mount flag and determine the default error handler */
 413         flag = JFS_ERR_REMOUNT_RO;
 414
 415         if (!parse_options((char *) data, sb, &newLVSize, &flag)) {
 416                 kfree(sbi);
 417                 return -EINVAL;
 418         }
 419         sbi->flag = flag;
 420
 421 #ifdef CONFIG_JFS_POSIX_ACL
 422         sb->s_flags |= MS_POSIXACL;
 423 #endif
 424
 425         if (newLVSize) {
 426                 printk(KERN_ERR "resize option for remount only\n");
 427                 return -EINVAL;
 428         }
 429
 430         /*
 431          * Initialize blocksize to 4K.
 432          */
 433         sb_set_blocksize(sb, PSIZE);
 434
 435         /*
 436          * Set method vectors.
 437          */
 438         sb->s_op = &jfs_super_operations;
 439         sb->s_export_op = &jfs_export_operations;
 440
 441         /*
 442          * Initialize direct-mapping inode/address-space
 443          */
 444         inode = new_inode(sb);
 445         if (inode == NULL)
 446                 goto out_kfree;
 447         inode->i_ino = 0;
 448         inode->i_nlink = 1;
 449         inode->i_size = sb->s_bdev->bd_inode->i_size;
 450         inode->i_mapping->a_ops = &jfs_metapage_aops;
 451         mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
 452
 453         sbi->direct_inode = inode;
 454
 455         rc = jfs_mount(sb);
 456         if (rc) {
 457                 if (!silent) {
 458                         jfs_err("jfs_mount failed w/return code = %d", rc);
 459                 }
 460                 goto out_mount_failed;
 461         }
 462         if (sb->s_flags & MS_RDONLY)
 463                 sbi->log = NULL;
 464         else {
 465                 rc = jfs_mount_rw(sb, 0);
 466                 if (rc) {
 467                         if (!silent) {
 468                                 jfs_err("jfs_mount_rw failed, return code = %d",
 469                                         rc);
 470                         }
 471                         goto out_no_rw;
 472                 }
 473         }
 474
 475         sb->s_magic = JFS_SUPER_MAGIC;
 476
 477         inode = iget(sb, ROOT_I);
 478         if (!inode || is_bad_inode(inode))
 479                 goto out_no_root;
 480         sb->s_root = d_alloc_root(inode);
 481         if (!sb->s_root)
 482                 goto out_no_root;
 483
 484         if (sbi->mntflag & JFS_OS2)
 485                 sb->s_root->d_op = &jfs_ci_dentry_operations;
 486
 487         /* logical blocks are represented by 40 bits in pxd_t, etc. */
 488         sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
 489 #if BITS_PER_LONG == 32
 490         /*
 491          * Page cache is indexed by long.
 492          * I would use MAX_LFS_FILESIZE, but it's only half as big
 493          */
 494         sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, sb->s_maxbytes);
 495 #endif
 496         sb->s_time_gran = 1;
 497         return 0;
 498
 499 out_no_root:
 500         jfs_err("jfs_read_super: get root inode failed");
 501         if (inode)
 502                 iput(inode);
 503
 504 out_no_rw:
 505         rc = jfs_umount(sb);
 506         if (rc) {
 507                 jfs_err("jfs_umount failed with return code %d", rc);
 508         }
 509 out_mount_failed:
 510         filemap_fdatawrite(sbi->direct_inode->i_mapping);
 511         filemap_fdatawait(sbi->direct_inode->i_mapping);
 512         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
 513         make_bad_inode(sbi->direct_inode);
 514         iput(sbi->direct_inode);
 515         sbi->direct_inode = NULL;
 516 out_kfree:
 517         if (sbi->nls_tab)
 518                 unload_nls(sbi->nls_tab);
 519         kfree(sbi);
 520         return -EINVAL;
 521 }
 522
 523 static void jfs_write_super_lockfs(struct super_block *sb)
 524 {
 525         struct jfs_sb_info *sbi = JFS_SBI(sb);
 526         struct jfs_log *log = sbi->log;
 527
 528         if (!(sb->s_flags & MS_RDONLY)) {
 529                 txQuiesce(sb);
 530                 lmLogShutdown(log);
 531                 updateSuper(sb, FM_CLEAN);
 532         }
 533 }
 534
 535 static void jfs_unlockfs(struct super_block *sb)
 536 {
 537         struct jfs_sb_info *sbi = JFS_SBI(sb);
 538         struct jfs_log *log = sbi->log;
 539         int rc = 0;
 540
 541         if (!(sb->s_flags & MS_RDONLY)) {
 542                 updateSuper(sb, FM_MOUNT);
 543                 if ((rc = lmLogInit(log)))
 544                         jfs_err("jfs_unlock failed with return code %d", rc);
 545                 else
 546                         txResume(sb);
 547         }
 548 }
 549
 550 static struct super_block *jfs_get_sb(struct file_system_type *fs_type,
 551         int flags, const char *dev_name, void *data)
 552 {
 553         return get_sb_bdev(fs_type, flags, dev_name, data, jfs_fill_super);
 554 }
 555
 556 static int jfs_sync_fs(struct super_block *sb, int wait)
 557 {
 558         struct jfs_log *log = JFS_SBI(sb)->log;
 559
 560         /* log == NULL indicates read-only mount */
 561         if (log)
 562                 jfs_flush_journal(log, wait);
 563
 564         return 0;
 565 }
 566
 567 static struct super_operations jfs_super_operations = {
 568         .alloc_inode    = jfs_alloc_inode,
 569         .destroy_inode  = jfs_destroy_inode,
 570         .read_inode     = jfs_read_inode,
 571         .dirty_inode    = jfs_dirty_inode,
 572         .write_inode    = jfs_write_inode,
 573         .delete_inode   = jfs_delete_inode,
 574         .put_super      = jfs_put_super,
 575         .sync_fs        = jfs_sync_fs,
 576         .write_super_lockfs = jfs_write_super_lockfs,
 577         .unlockfs       = jfs_unlockfs,
 578         .statfs         = jfs_statfs,
 579         .remount_fs     = jfs_remount,
 580 };
 581
 582 static struct export_operations jfs_export_operations = {
 583         .get_parent     = jfs_get_parent,
 584 };
 585
 586 static struct file_system_type jfs_fs_type = {
 587         .owner          = THIS_MODULE,
 588         .name           = "jfs",
 589         .get_sb         = jfs_get_sb,
 590         .kill_sb        = kill_block_super,
 591         .fs_flags       = FS_REQUIRES_DEV,
 592 };
 593
 594 extern int metapage_init(void);
 595 extern int txInit(void);
 596 extern void txExit(void);
 597 extern void metapage_exit(void);
 598
 599 static void init_once(void *foo, kmem_cache_t * cachep, unsigned long flags)
 600 {
 601         struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
 602
 603         if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
 604             SLAB_CTOR_CONSTRUCTOR) {
 605                 memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
 606                 INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
 607                 init_rwsem(&jfs_ip->rdwrlock);
 608                 init_MUTEX(&jfs_ip->commit_sem);
 609                 init_rwsem(&jfs_ip->xattr_sem);
 610                 spin_lock_init(&jfs_ip->ag_lock);
 611                 jfs_ip->active_ag = -1;
 612 #ifdef CONFIG_JFS_POSIX_ACL
 613                 jfs_ip->i_acl = JFS_ACL_NOT_CACHED;
 614                 jfs_ip->i_default_acl = JFS_ACL_NOT_CACHED;
 615 #endif
 616                 inode_init_once(&jfs_ip->vfs_inode);
 617         }
 618 }
 619
 620 static int __init init_jfs_fs(void)
 621 {
 622         int i;
 623         int rc;
 624
 625         jfs_inode_cachep =
 626             kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
 627                             SLAB_RECLAIM_ACCOUNT, init_once, NULL);
 628         if (jfs_inode_cachep == NULL)
 629                 return -ENOMEM;
 630
 631         /*
 632          * Metapage initialization
 633          */
 634         rc = metapage_init();
 635         if (rc) {
 636                 jfs_err("metapage_init failed w/rc = %d", rc);
 637                 goto free_slab;
 638         }
 639
 640         /*
 641          * Transaction Manager initialization
 642          */
 643         rc = txInit();
 644         if (rc) {
 645                 jfs_err("txInit failed w/rc = %d", rc);
 646                 goto free_metapage;
 647         }
 648
 649         /*
 650          * I/O completion thread (endio)
 651          */
 652         jfsIOthread = kernel_thread(jfsIOWait, NULL, CLONE_KERNEL);
 653         if (jfsIOthread < 0) {
 654                 jfs_err("init_jfs_fs: fork failed w/rc = %d", jfsIOthread);
 655                 goto end_txmngr;
 656         }
 657         wait_for_completion(&jfsIOwait);        /* Wait until thread starts */
 658
 659         if (commit_threads < 1)
 660                 commit_threads = num_online_cpus();
 661         if (commit_threads > MAX_COMMIT_THREADS)
 662                 commit_threads = MAX_COMMIT_THREADS;
 663
 664         for (i = 0; i < commit_threads; i++) {
 665                 jfsCommitThread[i] = kernel_thread(jfs_lazycommit, NULL,
 666                                                    CLONE_KERNEL);
 667                 if (jfsCommitThread[i] < 0) {
 668                         jfs_err("init_jfs_fs: fork failed w/rc = %d",
 669                                 jfsCommitThread[i]);
 670                         commit_threads = i;
 671                         goto kill_committask;
 672                 }
 673                 /* Wait until thread starts */
 674                 wait_for_completion(&jfsIOwait);
 675         }
 676
 677         jfsSyncThread = kernel_thread(jfs_sync, NULL, CLONE_KERNEL);
 678         if (jfsSyncThread < 0) {
 679                 jfs_err("init_jfs_fs: fork failed w/rc = %d", jfsSyncThread);
 680                 goto kill_committask;
 681         }
 682         wait_for_completion(&jfsIOwait);        /* Wait until thread starts */
 683
 684 #ifdef PROC_FS_JFS
 685         jfs_proc_init();
 686 #endif
 687
 688         return register_filesystem(&jfs_fs_type);
 689
 690 kill_committask:
 691         jfs_stop_threads = 1;
 692         wake_up_all(&jfs_commit_thread_wait);
 693         for (i = 0; i < commit_threads; i++)
 694                 wait_for_completion(&jfsIOwait);
 695
 696         wake_up(&jfs_IO_thread_wait);
 697         wait_for_completion(&jfsIOwait);        /* Wait for thread exit */
 698 end_txmngr:
 699         txExit();
 700 free_metapage:
 701         metapage_exit();
 702 free_slab:
 703         kmem_cache_destroy(jfs_inode_cachep);
 704         return rc;
 705 }
 706
 707 static void __exit exit_jfs_fs(void)
 708 {
 709         int i;
 710
 711         jfs_info("exit_jfs_fs called");
 712
 713         jfs_stop_threads = 1;
 714         txExit();
 715         metapage_exit();
 716         wake_up(&jfs_IO_thread_wait);
 717         wait_for_completion(&jfsIOwait);        /* Wait until IO thread exits */
 718         wake_up_all(&jfs_commit_thread_wait);
 719         for (i = 0; i < commit_threads; i++)
 720                 wait_for_completion(&jfsIOwait);
 721         wake_up(&jfs_sync_thread_wait);
 722         wait_for_completion(&jfsIOwait);        /* Wait until Sync thread exits */
 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)