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/posix_acl.h>
  29 #include <asm/uaccess.h>
  30 #include <linux/seq_file.h>
  31
  32 #include "jfs_incore.h"
  33 #include "jfs_filsys.h"
  34 #include "jfs_inode.h"
  35 #include "jfs_metapage.h"
  36 #include "jfs_superblock.h"
  37 #include "jfs_dmap.h"
  38 #include "jfs_imap.h"
  39 #include "jfs_acl.h"
  40 #include "jfs_debug.h"
  41
  42 MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
  43 MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
  44 MODULE_LICENSE("GPL");
  45
  46 static kmem_cache_t * jfs_inode_cachep;
  47
  48 static struct super_operations jfs_super_operations;
  49 static struct export_operations jfs_export_operations;
  50 static struct file_system_type jfs_fs_type;
  51
  52 #define MAX_COMMIT_THREADS 64
  53 static int commit_threads = 0;
  54 module_param(commit_threads, int, 0);
  55 MODULE_PARM_DESC(commit_threads, "Number of commit threads");
  56
  57 int jfs_stop_threads;
  58 static pid_t jfsIOthread;
  59 static pid_t jfsCommitThread[MAX_COMMIT_THREADS];
  60 static pid_t jfsSyncThread;
  61 DECLARE_COMPLETION(jfsIOwait);
  62
  63 #ifdef CONFIG_JFS_DEBUG
  64 int jfsloglevel = JFS_LOGLEVEL_WARN;
  65 module_param(jfsloglevel, int, 0644);
  66 MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
  67 #endif
  68
  69 static void jfs_handle_error(struct super_block *sb)
  70 {
  71         struct jfs_sb_info *sbi = JFS_SBI(sb);
  72
  73         if (sb->s_flags & MS_RDONLY)
  74                 return;
  75
  76         updateSuper(sb, FM_DIRTY);
  77
  78         if (sbi->flag & JFS_ERR_PANIC)
  79                 panic("JFS (device %s): panic forced after error\n",
  80                         sb->s_id);
  81         else if (sbi->flag & JFS_ERR_REMOUNT_RO) {
  82                 jfs_err("ERROR: (device %s): remounting filesystem "
  83                         "as read-only\n",
  84                         sb->s_id);
  85                 sb->s_flags |= MS_RDONLY;
  86         }
  87
  88         /* nothing is done for continue beyond marking the superblock dirty */
  89 }
  90
  91 void jfs_error(struct super_block *sb, const char * function, ...)
  92 {
  93         static char error_buf[256];
  94         va_list args;
  95
  96         va_start(args, function);
  97         vsprintf(error_buf, function, args);
  98         va_end(args);
  99
 100         printk(KERN_ERR "ERROR: (device %s): %s\n", sb->s_id, error_buf);
 101
 102         jfs_handle_error(sb);
 103 }
 104
 105 static struct inode *jfs_alloc_inode(struct super_block *sb)
 106 {
 107         struct jfs_inode_info *jfs_inode;
 108
 109         jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS);
 110         if (!jfs_inode)
 111                 return NULL;
 112         return &jfs_inode->vfs_inode;
 113 }
 114
 115 static void jfs_destroy_inode(struct inode *inode)
 116 {
 117         struct jfs_inode_info *ji = JFS_IP(inode);
 118
 119         BUG_ON(!list_empty(&ji->anon_inode_list));
 120
 121         spin_lock_irq(&ji->ag_lock);
 122         if (ji->active_ag != -1) {
 123                 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
 124                 atomic_dec(&bmap->db_active[ji->active_ag]);
 125                 ji->active_ag = -1;
 126         }
 127         spin_unlock_irq(&ji->ag_lock);
 128
 129 #ifdef CONFIG_JFS_POSIX_ACL
 130         if (ji->i_acl != JFS_ACL_NOT_CACHED) {
 131                 posix_acl_release(ji->i_acl);
 132                 ji->i_acl = JFS_ACL_NOT_CACHED;
 133         }
 134         if (ji->i_default_acl != JFS_ACL_NOT_CACHED) {
 135                 posix_acl_release(ji->i_default_acl);
 136                 ji->i_default_acl = JFS_ACL_NOT_CACHED;
 137         }
 138 #endif
 139
 140         kmem_cache_free(jfs_inode_cachep, ji);
 141 }
 142
 143 static int jfs_statfs(struct super_block *sb, struct kstatfs *buf)
 144 {
 145         struct jfs_sb_info *sbi = JFS_SBI(sb);
 146         s64 maxinodes;
 147         struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
 148
 149         jfs_info("In jfs_statfs");
 150         buf->f_type = JFS_SUPER_MAGIC;
 151         buf->f_bsize = sbi->bsize;
 152         buf->f_blocks = sbi->bmap->db_mapsize;
 153         buf->f_bfree = sbi->bmap->db_nfree;
 154         buf->f_bavail = sbi->bmap->db_nfree;
 155         /*
 156          * If we really return the number of allocated & free inodes, some
 157          * applications will fail because they won't see enough free inodes.
 158          * We'll try to calculate some guess as to how may inodes we can
 159          * really allocate
 160          *
 161          * buf->f_files = atomic_read(&imap->im_numinos);
 162          * buf->f_ffree = atomic_read(&imap->im_numfree);
 163          */
 164         maxinodes = min((s64) atomic_read(&imap->im_numinos) +
 165                         ((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
 166                          << L2INOSPEREXT), (s64) 0xffffffffLL);
 167         buf->f_files = maxinodes;
 168         buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
 169                                     atomic_read(&imap->im_numfree));
 170
 171         buf->f_namelen = JFS_NAME_MAX;
 172         return 0;
 173 }
 174
 175 static void jfs_put_super(struct super_block *sb)
 176 {
 177         struct jfs_sb_info *sbi = JFS_SBI(sb);
 178         int rc;
 179
 180         jfs_info("In jfs_put_super");
 181         rc = jfs_umount(sb);
 182         if (rc)
 183                 jfs_err("jfs_umount failed with return code %d", rc);
 184         if (sbi->nls_tab)
 185                 unload_nls(sbi->nls_tab);
 186         sbi->nls_tab = NULL;
 187
 188         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
 189         iput(sbi->direct_inode);
 190         sbi->direct_inode = NULL;
 191
 192         kfree(sbi);
 193 }
 194
 195 enum {
 196         Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
 197         Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota,
 198         Opt_usrquota, Opt_grpquota
 199 };
 200
 201 static match_table_t tokens = {
 202         {Opt_integrity, "integrity"},
 203         {Opt_nointegrity, "nointegrity"},
 204         {Opt_iocharset, "iocharset=%s"},
 205         {Opt_resize, "resize=%u"},
 206         {Opt_resize_nosize, "resize"},
 207         {Opt_errors, "errors=%s"},
 208         {Opt_ignore, "noquota"},
 209         {Opt_ignore, "quota"},
 210         {Opt_usrquota, "usrquota"},
 211         {Opt_grpquota, "grpquota"},
 212         {Opt_err, NULL}
 213 };
 214
 215 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
 216                          int *flag)
 217 {
 218         void *nls_map = (void *)-1;     /* -1: no change;  NULL: none */
 219         char *p;
 220         struct jfs_sb_info *sbi = JFS_SBI(sb);
 221
 222         *newLVSize = 0;
 223
 224         if (!options)
 225                 return 1;
 226
 227         while ((p = strsep(&options, ",")) != NULL) {
 228                 substring_t args[MAX_OPT_ARGS];
 229                 int token;
 230                 if (!*p)
 231                         continue;
 232
 233                 token = match_token(p, tokens, args);
 234                 switch (token) {
 235                 case Opt_integrity:
 236                         *flag &= ~JFS_NOINTEGRITY;
 237                         break;
 238                 case Opt_nointegrity:
 239                         *flag |= JFS_NOINTEGRITY;
 240                         break;
 241                 case Opt_ignore:
 242                         /* Silently ignore the quota options */
 243                         /* Don't do anything ;-) */
 244                         break;
 245                 case Opt_iocharset:
 246                         if (nls_map && nls_map != (void *) -1)
 247                                 unload_nls(nls_map);
 248                         if (!strcmp(args[0].from, "none"))
 249                                 nls_map = NULL;
 250                         else {
 251                                 nls_map = load_nls(args[0].from);
 252                                 if (!nls_map) {
 253                                         printk(KERN_ERR
 254                                                "JFS: charset not found\n");
 255                                         goto cleanup;
 256                                 }
 257                         }
 258                         break;
 259                 case Opt_resize:
 260                 {
 261                         char *resize = args[0].from;
 262                         *newLVSize = simple_strtoull(resize, &resize, 0);
 263                         break;
 264                 }
 265                 case Opt_resize_nosize:
 266                 {
 267                         *newLVSize = sb->s_bdev->bd_inode->i_size >>
 268                                 sb->s_blocksize_bits;
 269                         if (*newLVSize == 0)
 270                                 printk(KERN_ERR
 271                                        "JFS: Cannot determine volume size\n");
 272                         break;
 273                 }
 274                 case Opt_errors:
 275                 {
 276                         char *errors = args[0].from;
 277                         if (!errors || !*errors)
 278                                 goto cleanup;
 279                         if (!strcmp(errors, "continue")) {
 280                                 *flag &= ~JFS_ERR_REMOUNT_RO;
 281                                 *flag &= ~JFS_ERR_PANIC;
 282                                 *flag |= JFS_ERR_CONTINUE;
 283                         } else if (!strcmp(errors, "remount-ro")) {
 284                                 *flag &= ~JFS_ERR_CONTINUE;
 285                                 *flag &= ~JFS_ERR_PANIC;
 286                                 *flag |= JFS_ERR_REMOUNT_RO;
 287                         } else if (!strcmp(errors, "panic")) {
 288                                 *flag &= ~JFS_ERR_CONTINUE;
 289                                 *flag &= ~JFS_ERR_REMOUNT_RO;
 290                                 *flag |= JFS_ERR_PANIC;
 291                         } else {
 292                                 printk(KERN_ERR
 293                                        "JFS: %s is an invalid error handler\n",
 294                                        errors);
 295                                 goto cleanup;
 296                         }
 297                         break;
 298                 }
 299
 300 #if defined(CONFIG_QUOTA)
 301                 case Opt_quota:
 302                 case Opt_usrquota:
 303                         *flag |= JFS_USRQUOTA;
 304                         break;
 305                 case Opt_grpquota:
 306                         *flag |= JFS_GRPQUOTA;
 307                         break;
 308 #else
 309                 case Opt_usrquota:
 310                 case Opt_grpquota:
 311                 case Opt_quota:
 312                         printk(KERN_ERR
 313                                "JFS: quota operations not supported\n");
 314                         break;
 315 #endif
 316
 317                 default:
 318                         printk("jfs: Unrecognized mount option \"%s\" "
 319                                         " or missing value\n", p);
 320                         goto cleanup;
 321                 }
 322         }
 323
 324         if (nls_map != (void *) -1) {
 325                 /* Discard old (if remount) */
 326                 if (sbi->nls_tab)
 327                         unload_nls(sbi->nls_tab);
 328                 sbi->nls_tab = nls_map;
 329         }
 330         return 1;
 331
 332 cleanup:
 333         if (nls_map && nls_map != (void *) -1)
 334                 unload_nls(nls_map);
 335         return 0;
 336 }
 337
 338 static int jfs_remount(struct super_block *sb, int *flags, char *data)
 339 {
 340         s64 newLVSize = 0;
 341         int rc = 0;
 342         int flag = JFS_SBI(sb)->flag;
 343
 344         if (!parse_options(data, sb, &newLVSize, &flag)) {
 345                 return -EINVAL;
 346         }
 347         if (newLVSize) {
 348                 if (sb->s_flags & MS_RDONLY) {
 349                         printk(KERN_ERR
 350                   "JFS: resize requires volume to be mounted read-write\n");
 351                         return -EROFS;
 352                 }
 353                 rc = jfs_extendfs(sb, newLVSize, 0);
 354                 if (rc)
 355                         return rc;
 356         }
 357
 358         if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
 359                 /*
 360                  * Invalidate any previously read metadata.  fsck may have
 361                  * changed the on-disk data since we mounted r/o
 362                  */
 363                 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
 364
 365                 JFS_SBI(sb)->flag = flag;
 366                 return jfs_mount_rw(sb, 1);
 367         }
 368         if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
 369                 rc = jfs_umount_rw(sb);
 370                 JFS_SBI(sb)->flag = flag;
 371                 return rc;
 372         }
 373         if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
 374                 if (!(sb->s_flags & MS_RDONLY)) {
 375                         rc = jfs_umount_rw(sb);
 376                         if (rc)
 377                                 return rc;
 378                         JFS_SBI(sb)->flag = flag;
 379                         return jfs_mount_rw(sb, 1);
 380                 }
 381         JFS_SBI(sb)->flag = flag;
 382
 383         return 0;
 384 }
 385
 386 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
 387 {
 388         struct jfs_sb_info *sbi;
 389         struct inode *inode;
 390         int rc;
 391         s64 newLVSize = 0;
 392         int flag;
 393
 394         jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
 395
 396         if (!new_valid_dev(sb->s_bdev->bd_dev))
 397                 return -EOVERFLOW;
 398
 399         sbi = kmalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
 400         if (!sbi)
 401                 return -ENOSPC;
 402         memset(sbi, 0, sizeof (struct jfs_sb_info));
 403         sb->s_fs_info = sbi;
 404         sbi->sb = sb;
 405
 406         /* initialize the mount flag and determine the default error handler */
 407         flag = JFS_ERR_REMOUNT_RO;
 408
 409         if (!parse_options((char *) data, sb, &newLVSize, &flag)) {
 410                 kfree(sbi);
 411                 return -EINVAL;
 412         }
 413         sbi->flag = flag;
 414
 415 #ifdef CONFIG_JFS_POSIX_ACL
 416         sb->s_flags |= MS_POSIXACL;
 417 #endif
 418
 419         if (newLVSize) {
 420                 printk(KERN_ERR "resize option for remount only\n");
 421                 return -EINVAL;
 422         }
 423
 424         /*
 425          * Initialize blocksize to 4K.
 426          */
 427         sb_set_blocksize(sb, PSIZE);
 428
 429         /*
 430          * Set method vectors.
 431          */
 432         sb->s_op = &jfs_super_operations;
 433         sb->s_export_op = &jfs_export_operations;
 434
 435         /*
 436          * Initialize direct-mapping inode/address-space
 437          */
 438         inode = new_inode(sb);
 439         if (inode == NULL)
 440                 goto out_kfree;
 441         inode->i_ino = 0;
 442         inode->i_nlink = 1;
 443         inode->i_size = sb->s_bdev->bd_inode->i_size;
 444         inode->i_mapping->a_ops = &jfs_metapage_aops;
 445         mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
 446
 447         sbi->direct_inode = inode;
 448
 449         rc = jfs_mount(sb);
 450         if (rc) {
 451                 if (!silent) {
 452                         jfs_err("jfs_mount failed w/return code = %d", rc);
 453                 }
 454                 goto out_mount_failed;
 455         }
 456         if (sb->s_flags & MS_RDONLY)
 457                 sbi->log = NULL;
 458         else {
 459                 rc = jfs_mount_rw(sb, 0);
 460                 if (rc) {
 461                         if (!silent) {
 462                                 jfs_err("jfs_mount_rw failed, return code = %d",
 463                                         rc);
 464                         }
 465                         goto out_no_rw;
 466                 }
 467         }
 468
 469         sb->s_magic = JFS_SUPER_MAGIC;
 470
 471         inode = iget(sb, ROOT_I);
 472         if (!inode || is_bad_inode(inode))
 473                 goto out_no_root;
 474         sb->s_root = d_alloc_root(inode);
 475         if (!sb->s_root)
 476                 goto out_no_root;
 477
 478         if (sbi->mntflag & JFS_OS2)
 479                 sb->s_root->d_op = &jfs_ci_dentry_operations;
 480
 481         /* logical blocks are represented by 40 bits in pxd_t, etc. */
 482         sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
 483 #if BITS_PER_LONG == 32
 484         /*
 485          * Page cache is indexed by long.
 486          * I would use MAX_LFS_FILESIZE, but it's only half as big
 487          */
 488         sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, sb->s_maxbytes);
 489 #endif
 490         sb->s_time_gran = 1;
 491         return 0;
 492
 493 out_no_root:
 494         jfs_err("jfs_read_super: get root inode failed");
 495         if (inode)
 496                 iput(inode);
 497
 498 out_no_rw:
 499         rc = jfs_umount(sb);
 500         if (rc) {
 501                 jfs_err("jfs_umount failed with return code %d", rc);
 502         }
 503 out_mount_failed:
 504         filemap_fdatawrite(sbi->direct_inode->i_mapping);
 505         filemap_fdatawait(sbi->direct_inode->i_mapping);
 506         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
 507         make_bad_inode(sbi->direct_inode);
 508         iput(sbi->direct_inode);
 509         sbi->direct_inode = NULL;
 510 out_kfree:
 511         if (sbi->nls_tab)
 512                 unload_nls(sbi->nls_tab);
 513         kfree(sbi);
 514         return -EINVAL;
 515 }
 516
 517 static void jfs_write_super_lockfs(struct super_block *sb)
 518 {
 519         struct jfs_sb_info *sbi = JFS_SBI(sb);
 520         struct jfs_log *log = sbi->log;
 521
 522         if (!(sb->s_flags & MS_RDONLY)) {
 523                 txQuiesce(sb);
 524                 lmLogShutdown(log);
 525                 updateSuper(sb, FM_CLEAN);
 526         }
 527 }
 528
 529 static void jfs_unlockfs(struct super_block *sb)
 530 {
 531         struct jfs_sb_info *sbi = JFS_SBI(sb);
 532         struct jfs_log *log = sbi->log;
 533         int rc = 0;
 534
 535         if (!(sb->s_flags & MS_RDONLY)) {
 536                 updateSuper(sb, FM_MOUNT);
 537                 if ((rc = lmLogInit(log)))
 538                         jfs_err("jfs_unlock failed with return code %d", rc);
 539                 else
 540                         txResume(sb);
 541         }
 542 }
 543
 544 static struct super_block *jfs_get_sb(struct file_system_type *fs_type,
 545         int flags, const char *dev_name, void *data)
 546 {
 547         return get_sb_bdev(fs_type, flags, dev_name, data, jfs_fill_super);
 548 }
 549
 550 static int jfs_sync_fs(struct super_block *sb, int wait)
 551 {
 552         struct jfs_log *log = JFS_SBI(sb)->log;
 553
 554         /* log == NULL indicates read-only mount */
 555         if (log) {
 556                 jfs_flush_journal(log, wait);
 557                 jfs_syncpt(log, 0);
 558         }
 559
 560         return 0;
 561 }
 562
 563 static int jfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
 564 {
 565         struct jfs_sb_info *sbi = JFS_SBI(vfs->mnt_sb);
 566
 567         if (sbi->flag & JFS_NOINTEGRITY)
 568                 seq_puts(seq, ",nointegrity");
 569         else
 570                 seq_puts(seq, ",integrity");
 571
 572 #if defined(CONFIG_QUOTA)
 573         if (sbi->flag & JFS_USRQUOTA)
 574                 seq_puts(seq, ",usrquota");
 575
 576         if (sbi->flag & JFS_GRPQUOTA)
 577                 seq_puts(seq, ",grpquota");
 578 #endif
 579
 580         return 0;
 581 }
 582
 583 static struct super_operations jfs_super_operations = {
 584         .alloc_inode    = jfs_alloc_inode,
 585         .destroy_inode  = jfs_destroy_inode,
 586         .read_inode     = jfs_read_inode,
 587         .dirty_inode    = jfs_dirty_inode,
 588         .write_inode    = jfs_write_inode,
 589         .delete_inode   = jfs_delete_inode,
 590         .put_super      = jfs_put_super,
 591         .sync_fs        = jfs_sync_fs,
 592         .write_super_lockfs = jfs_write_super_lockfs,
 593         .unlockfs       = jfs_unlockfs,
 594         .statfs         = jfs_statfs,
 595         .remount_fs     = jfs_remount,
 596         .show_options   = jfs_show_options
 597 };
 598
 599 static struct export_operations jfs_export_operations = {
 600         .get_parent     = jfs_get_parent,
 601 };
 602
 603 static struct file_system_type jfs_fs_type = {
 604         .owner          = THIS_MODULE,
 605         .name           = "jfs",
 606         .get_sb         = jfs_get_sb,
 607         .kill_sb        = kill_block_super,
 608         .fs_flags       = FS_REQUIRES_DEV,
 609 };
 610
 611 static void init_once(void *foo, kmem_cache_t * cachep, unsigned long flags)
 612 {
 613         struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
 614
 615         if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
 616             SLAB_CTOR_CONSTRUCTOR) {
 617                 memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
 618                 INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
 619                 init_rwsem(&jfs_ip->rdwrlock);
 620                 init_MUTEX(&jfs_ip->commit_sem);
 621                 init_rwsem(&jfs_ip->xattr_sem);
 622                 spin_lock_init(&jfs_ip->ag_lock);
 623                 jfs_ip->active_ag = -1;
 624 #ifdef CONFIG_JFS_POSIX_ACL
 625                 jfs_ip->i_acl = JFS_ACL_NOT_CACHED;
 626                 jfs_ip->i_default_acl = JFS_ACL_NOT_CACHED;
 627 #endif
 628                 inode_init_once(&jfs_ip->vfs_inode);
 629         }
 630 }
 631
 632 static int __init init_jfs_fs(void)
 633 {
 634         int i;
 635         int rc;
 636
 637         jfs_inode_cachep =
 638             kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
 639                             SLAB_RECLAIM_ACCOUNT, init_once, NULL);
 640         if (jfs_inode_cachep == NULL)
 641                 return -ENOMEM;
 642
 643         /*
 644          * Metapage initialization
 645          */
 646         rc = metapage_init();
 647         if (rc) {
 648                 jfs_err("metapage_init failed w/rc = %d", rc);
 649                 goto free_slab;
 650         }
 651
 652         /*
 653          * Transaction Manager initialization
 654          */
 655         rc = txInit();
 656         if (rc) {
 657                 jfs_err("txInit failed w/rc = %d", rc);
 658                 goto free_metapage;
 659         }
 660
 661         /*
 662          * I/O completion thread (endio)
 663          */
 664         jfsIOthread = kernel_thread(jfsIOWait, NULL, CLONE_KERNEL);
 665         if (jfsIOthread < 0) {
 666                 jfs_err("init_jfs_fs: fork failed w/rc = %d", jfsIOthread);
 667                 goto end_txmngr;
 668         }
 669         wait_for_completion(&jfsIOwait);        /* Wait until thread starts */
 670
 671         if (commit_threads < 1)
 672                 commit_threads = num_online_cpus();
 673         if (commit_threads > MAX_COMMIT_THREADS)
 674                 commit_threads = MAX_COMMIT_THREADS;
 675
 676         for (i = 0; i < commit_threads; i++) {
 677                 jfsCommitThread[i] = kernel_thread(jfs_lazycommit, NULL,
 678                                                    CLONE_KERNEL);
 679                 if (jfsCommitThread[i] < 0) {
 680                         jfs_err("init_jfs_fs: fork failed w/rc = %d",
 681                                 jfsCommitThread[i]);
 682                         commit_threads = i;
 683                         goto kill_committask;
 684                 }
 685                 /* Wait until thread starts */
 686                 wait_for_completion(&jfsIOwait);
 687         }
 688
 689         jfsSyncThread = kernel_thread(jfs_sync, NULL, CLONE_KERNEL);
 690         if (jfsSyncThread < 0) {
 691                 jfs_err("init_jfs_fs: fork failed w/rc = %d", jfsSyncThread);
 692                 goto kill_committask;
 693         }
 694         wait_for_completion(&jfsIOwait);        /* Wait until thread starts */
 695
 696 #ifdef PROC_FS_JFS
 697         jfs_proc_init();
 698 #endif
 699
 700         return register_filesystem(&jfs_fs_type);
 701
 702 kill_committask:
 703         jfs_stop_threads = 1;
 704         wake_up_all(&jfs_commit_thread_wait);
 705         for (i = 0; i < commit_threads; i++)
 706                 wait_for_completion(&jfsIOwait);
 707
 708         wake_up(&jfs_IO_thread_wait);
 709         wait_for_completion(&jfsIOwait);        /* Wait for thread exit */
 710 end_txmngr:
 711         txExit();
 712 free_metapage:
 713         metapage_exit();
 714 free_slab:
 715         kmem_cache_destroy(jfs_inode_cachep);
 716         return rc;
 717 }
 718
 719 static void __exit exit_jfs_fs(void)
 720 {
 721         int i;
 722
 723         jfs_info("exit_jfs_fs called");
 724
 725         jfs_stop_threads = 1;
 726         txExit();
 727         metapage_exit();
 728         wake_up(&jfs_IO_thread_wait);
 729         wait_for_completion(&jfsIOwait);        /* Wait until IO thread exits */
 730         wake_up_all(&jfs_commit_thread_wait);
 731         for (i = 0; i < commit_threads; i++)
 732                 wait_for_completion(&jfsIOwait);
 733         wake_up(&jfs_sync_thread_wait);
 734         wait_for_completion(&jfsIOwait);        /* Wait until Sync thread exits */
 735 #ifdef PROC_FS_JFS
 736         jfs_proc_clean();
 737 #endif
 738         unregister_filesystem(&jfs_fs_type);
 739         kmem_cache_destroy(jfs_inode_cachep);
 740 }
 741
 742 module_init(init_jfs_fs)
 743 module_exit(exit_jfs_fs)