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, Opt_tagxid
 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_tagxid, "tagxid"},
 209         {Opt_ignore, "noquota"},
 210         {Opt_ignore, "quota"},
 211         {Opt_usrquota, "usrquota"},
 212         {Opt_grpquota, "grpquota"},
 213         {Opt_err, NULL}
 214 };
 215
 216 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
 217                          int *flag)
 218 {
 219         void *nls_map = (void *)-1;     /* -1: no change;  NULL: none */
 220         char *p;
 221         struct jfs_sb_info *sbi = JFS_SBI(sb);
 222
 223         *newLVSize = 0;
 224
 225         if (!options)
 226                 return 1;
 227
 228         while ((p = strsep(&options, ",")) != NULL) {
 229                 substring_t args[MAX_OPT_ARGS];
 230                 int token;
 231                 if (!*p)
 232                         continue;
 233
 234                 token = match_token(p, tokens, args);
 235                 switch (token) {
 236                 case Opt_integrity:
 237                         *flag &= ~JFS_NOINTEGRITY;
 238                         break;
 239                 case Opt_nointegrity:
 240                         *flag |= JFS_NOINTEGRITY;
 241                         break;
 242                 case Opt_ignore:
 243                         /* Silently ignore the quota options */
 244                         /* Don't do anything ;-) */
 245                         break;
 246                 case Opt_iocharset:
 247                         if (nls_map && nls_map != (void *) -1)
 248                                 unload_nls(nls_map);
 249                         if (!strcmp(args[0].from, "none"))
 250                                 nls_map = NULL;
 251                         else {
 252                                 nls_map = load_nls(args[0].from);
 253                                 if (!nls_map) {
 254                                         printk(KERN_ERR
 255                                                "JFS: charset not found\n");
 256                                         goto cleanup;
 257                                 }
 258                         }
 259                         break;
 260                 case Opt_resize:
 261                 {
 262                         char *resize = args[0].from;
 263                         *newLVSize = simple_strtoull(resize, &resize, 0);
 264                         break;
 265                 }
 266                 case Opt_resize_nosize:
 267                 {
 268                         *newLVSize = sb->s_bdev->bd_inode->i_size >>
 269                                 sb->s_blocksize_bits;
 270                         if (*newLVSize == 0)
 271                                 printk(KERN_ERR
 272                                        "JFS: Cannot determine volume size\n");
 273                         break;
 274                 }
 275                 case Opt_errors:
 276                 {
 277                         char *errors = args[0].from;
 278                         if (!errors || !*errors)
 279                                 goto cleanup;
 280                         if (!strcmp(errors, "continue")) {
 281                                 *flag &= ~JFS_ERR_REMOUNT_RO;
 282                                 *flag &= ~JFS_ERR_PANIC;
 283                                 *flag |= JFS_ERR_CONTINUE;
 284                         } else if (!strcmp(errors, "remount-ro")) {
 285                                 *flag &= ~JFS_ERR_CONTINUE;
 286                                 *flag &= ~JFS_ERR_PANIC;
 287                                 *flag |= JFS_ERR_REMOUNT_RO;
 288                         } else if (!strcmp(errors, "panic")) {
 289                                 *flag &= ~JFS_ERR_CONTINUE;
 290                                 *flag &= ~JFS_ERR_REMOUNT_RO;
 291                                 *flag |= JFS_ERR_PANIC;
 292                         } else {
 293                                 printk(KERN_ERR
 294                                        "JFS: %s is an invalid error handler\n",
 295                                        errors);
 296                                 goto cleanup;
 297                         }
 298                         break;
 299                 }
 300
 301 #if defined(CONFIG_QUOTA)
 302                 case Opt_quota:
 303                 case Opt_usrquota:
 304                         *flag |= JFS_USRQUOTA;
 305                         break;
 306                 case Opt_grpquota:
 307                         *flag |= JFS_GRPQUOTA;
 308                         break;
 309 #else
 310                 case Opt_usrquota:
 311                 case Opt_grpquota:
 312                 case Opt_quota:
 313                         printk(KERN_ERR
 314                                "JFS: quota operations not supported\n");
 315                         break;
 316 #endif
 317 #ifndef CONFIG_INOXID_NONE
 318                 case Opt_tagxid:
 319                         *flag |= JFS_TAGXID;
 320                         break;
 321 #endif
 322                 default:
 323                         printk("jfs: Unrecognized mount option \"%s\" "
 324                                         " or missing value\n", p);
 325                         goto cleanup;
 326                 }
 327         }
 328
 329         if (nls_map != (void *) -1) {
 330                 /* Discard old (if remount) */
 331                 if (sbi->nls_tab)
 332                         unload_nls(sbi->nls_tab);
 333                 sbi->nls_tab = nls_map;
 334         }
 335         return 1;
 336
 337 cleanup:
 338         if (nls_map && nls_map != (void *) -1)
 339                 unload_nls(nls_map);
 340         return 0;
 341 }
 342
 343 static int jfs_remount(struct super_block *sb, int *flags, char *data)
 344 {
 345         s64 newLVSize = 0;
 346         int rc = 0;
 347         int flag = JFS_SBI(sb)->flag;
 348
 349         if (!parse_options(data, sb, &newLVSize, &flag)) {
 350                 return -EINVAL;
 351         }
 352
 353         if ((flag & JFS_TAGXID) && !(sb->s_flags & MS_TAGXID)) {
 354                 printk(KERN_ERR "JFS: %s: tagxid not permitted on remount.\n",
 355                         sb->s_id);
 356                 return -EINVAL;
 357         }
 358
 359         if (newLVSize) {
 360                 if (sb->s_flags & MS_RDONLY) {
 361                         printk(KERN_ERR
 362                   "JFS: resize requires volume to be mounted read-write\n");
 363                         return -EROFS;
 364                 }
 365                 rc = jfs_extendfs(sb, newLVSize, 0);
 366                 if (rc)
 367                         return rc;
 368         }
 369
 370         if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
 371                 /*
 372                  * Invalidate any previously read metadata.  fsck may have
 373                  * changed the on-disk data since we mounted r/o
 374                  */
 375                 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
 376
 377                 JFS_SBI(sb)->flag = flag;
 378                 return jfs_mount_rw(sb, 1);
 379         }
 380         if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
 381                 rc = jfs_umount_rw(sb);
 382                 JFS_SBI(sb)->flag = flag;
 383                 return rc;
 384         }
 385         if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
 386                 if (!(sb->s_flags & MS_RDONLY)) {
 387                         rc = jfs_umount_rw(sb);
 388                         if (rc)
 389                                 return rc;
 390                         JFS_SBI(sb)->flag = flag;
 391                         return jfs_mount_rw(sb, 1);
 392                 }
 393         JFS_SBI(sb)->flag = flag;
 394
 395         return 0;
 396 }
 397
 398 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
 399 {
 400         struct jfs_sb_info *sbi;
 401         struct inode *inode;
 402         int rc;
 403         s64 newLVSize = 0;
 404         int flag;
 405
 406         jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
 407
 408         if (!new_valid_dev(sb->s_bdev->bd_dev))
 409                 return -EOVERFLOW;
 410
 411         sbi = kmalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
 412         if (!sbi)
 413                 return -ENOSPC;
 414         memset(sbi, 0, sizeof (struct jfs_sb_info));
 415         sb->s_fs_info = sbi;
 416         sbi->sb = sb;
 417
 418         /* initialize the mount flag and determine the default error handler */
 419         flag = JFS_ERR_REMOUNT_RO;
 420
 421         if (!parse_options((char *) data, sb, &newLVSize, &flag)) {
 422                 kfree(sbi);
 423                 return -EINVAL;
 424         }
 425         sbi->flag = flag;
 426
 427 #ifdef CONFIG_JFS_POSIX_ACL
 428         sb->s_flags |= MS_POSIXACL;
 429 #endif
 430         /* map mount option tagxid */
 431         if (sbi->flag & JFS_TAGXID)
 432                 sb->s_flags |= MS_TAGXID;
 433
 434         if (newLVSize) {
 435                 printk(KERN_ERR "resize option for remount only\n");
 436                 return -EINVAL;
 437         }
 438
 439         /*
 440          * Initialize blocksize to 4K.
 441          */
 442         sb_set_blocksize(sb, PSIZE);
 443
 444         /*
 445          * Set method vectors.
 446          */
 447         sb->s_op = &jfs_super_operations;
 448         sb->s_export_op = &jfs_export_operations;
 449
 450         /*
 451          * Initialize direct-mapping inode/address-space
 452          */
 453         inode = new_inode(sb);
 454         if (inode == NULL)
 455                 goto out_kfree;
 456         inode->i_ino = 0;
 457         inode->i_nlink = 1;
 458         inode->i_size = sb->s_bdev->bd_inode->i_size;
 459         inode->i_mapping->a_ops = &jfs_metapage_aops;
 460         insert_inode_hash(inode);
 461         mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
 462
 463         sbi->direct_inode = inode;
 464
 465         rc = jfs_mount(sb);
 466         if (rc) {
 467                 if (!silent) {
 468                         jfs_err("jfs_mount failed w/return code = %d", rc);
 469                 }
 470                 goto out_mount_failed;
 471         }
 472         if (sb->s_flags & MS_RDONLY)
 473                 sbi->log = NULL;
 474         else {
 475                 rc = jfs_mount_rw(sb, 0);
 476                 if (rc) {
 477                         if (!silent) {
 478                                 jfs_err("jfs_mount_rw failed, return code = %d",
 479                                         rc);
 480                         }
 481                         goto out_no_rw;
 482                 }
 483         }
 484
 485         sb->s_magic = JFS_SUPER_MAGIC;
 486
 487         inode = iget(sb, ROOT_I);
 488         if (!inode || is_bad_inode(inode))
 489                 goto out_no_root;
 490         sb->s_root = d_alloc_root(inode);
 491         if (!sb->s_root)
 492                 goto out_no_root;
 493
 494         if (sbi->mntflag & JFS_OS2)
 495                 sb->s_root->d_op = &jfs_ci_dentry_operations;
 496
 497         /* logical blocks are represented by 40 bits in pxd_t, etc. */
 498         sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
 499 #if BITS_PER_LONG == 32
 500         /*
 501          * Page cache is indexed by long.
 502          * I would use MAX_LFS_FILESIZE, but it's only half as big
 503          */
 504         sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, sb->s_maxbytes);
 505 #endif
 506         sb->s_time_gran = 1;
 507         return 0;
 508
 509 out_no_root:
 510         jfs_err("jfs_read_super: get root inode failed");
 511         if (inode)
 512                 iput(inode);
 513
 514 out_no_rw:
 515         rc = jfs_umount(sb);
 516         if (rc) {
 517                 jfs_err("jfs_umount failed with return code %d", rc);
 518         }
 519 out_mount_failed:
 520         filemap_write_and_wait(sbi->direct_inode->i_mapping);
 521         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
 522         make_bad_inode(sbi->direct_inode);
 523         iput(sbi->direct_inode);
 524         sbi->direct_inode = NULL;
 525 out_kfree:
 526         if (sbi->nls_tab)
 527                 unload_nls(sbi->nls_tab);
 528         kfree(sbi);
 529         return -EINVAL;
 530 }
 531
 532 static void jfs_write_super_lockfs(struct super_block *sb)
 533 {
 534         struct jfs_sb_info *sbi = JFS_SBI(sb);
 535         struct jfs_log *log = sbi->log;
 536
 537         if (!(sb->s_flags & MS_RDONLY)) {
 538                 txQuiesce(sb);
 539                 lmLogShutdown(log);
 540                 updateSuper(sb, FM_CLEAN);
 541         }
 542 }
 543
 544 static void jfs_unlockfs(struct super_block *sb)
 545 {
 546         struct jfs_sb_info *sbi = JFS_SBI(sb);
 547         struct jfs_log *log = sbi->log;
 548         int rc = 0;
 549
 550         if (!(sb->s_flags & MS_RDONLY)) {
 551                 updateSuper(sb, FM_MOUNT);
 552                 if ((rc = lmLogInit(log)))
 553                         jfs_err("jfs_unlock failed with return code %d", rc);
 554                 else
 555                         txResume(sb);
 556         }
 557 }
 558
 559 static struct super_block *jfs_get_sb(struct file_system_type *fs_type,
 560         int flags, const char *dev_name, void *data)
 561 {
 562         return get_sb_bdev(fs_type, flags, dev_name, data, jfs_fill_super);
 563 }
 564
 565 static int jfs_sync_fs(struct super_block *sb, int wait)
 566 {
 567         struct jfs_log *log = JFS_SBI(sb)->log;
 568
 569         /* log == NULL indicates read-only mount */
 570         if (log) {
 571                 jfs_flush_journal(log, wait);
 572                 jfs_syncpt(log, 0);
 573         }
 574
 575         return 0;
 576 }
 577
 578 static int jfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
 579 {
 580         struct jfs_sb_info *sbi = JFS_SBI(vfs->mnt_sb);
 581
 582         if (sbi->flag & JFS_NOINTEGRITY)
 583                 seq_puts(seq, ",nointegrity");
 584         else
 585                 seq_puts(seq, ",integrity");
 586
 587 #if defined(CONFIG_QUOTA)
 588         if (sbi->flag & JFS_USRQUOTA)
 589                 seq_puts(seq, ",usrquota");
 590
 591         if (sbi->flag & JFS_GRPQUOTA)
 592                 seq_puts(seq, ",grpquota");
 593 #endif
 594
 595         return 0;
 596 }
 597
 598 static struct super_operations jfs_super_operations = {
 599         .alloc_inode    = jfs_alloc_inode,
 600         .destroy_inode  = jfs_destroy_inode,
 601         .read_inode     = jfs_read_inode,
 602         .dirty_inode    = jfs_dirty_inode,
 603         .write_inode    = jfs_write_inode,
 604         .delete_inode   = jfs_delete_inode,
 605         .put_super      = jfs_put_super,
 606         .sync_fs        = jfs_sync_fs,
 607         .write_super_lockfs = jfs_write_super_lockfs,
 608         .unlockfs       = jfs_unlockfs,
 609         .statfs         = jfs_statfs,
 610         .remount_fs     = jfs_remount,
 611         .show_options   = jfs_show_options
 612 };
 613
 614 static struct export_operations jfs_export_operations = {
 615         .get_parent     = jfs_get_parent,
 616 };
 617
 618 static struct file_system_type jfs_fs_type = {
 619         .owner          = THIS_MODULE,
 620         .name           = "jfs",
 621         .get_sb         = jfs_get_sb,
 622         .kill_sb        = kill_block_super,
 623         .fs_flags       = FS_REQUIRES_DEV,
 624 };
 625
 626 static void init_once(void *foo, kmem_cache_t * cachep, unsigned long flags)
 627 {
 628         struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
 629
 630         if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
 631             SLAB_CTOR_CONSTRUCTOR) {
 632                 memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
 633                 INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
 634                 init_rwsem(&jfs_ip->rdwrlock);
 635                 init_MUTEX(&jfs_ip->commit_sem);
 636                 init_rwsem(&jfs_ip->xattr_sem);
 637                 spin_lock_init(&jfs_ip->ag_lock);
 638                 jfs_ip->active_ag = -1;
 639 #ifdef CONFIG_JFS_POSIX_ACL
 640                 jfs_ip->i_acl = JFS_ACL_NOT_CACHED;
 641                 jfs_ip->i_default_acl = JFS_ACL_NOT_CACHED;
 642 #endif
 643                 inode_init_once(&jfs_ip->vfs_inode);
 644         }
 645 }
 646
 647 static int __init init_jfs_fs(void)
 648 {
 649         int i;
 650         int rc;
 651
 652         jfs_inode_cachep =
 653             kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
 654                             SLAB_RECLAIM_ACCOUNT, init_once, NULL);
 655         if (jfs_inode_cachep == NULL)
 656                 return -ENOMEM;
 657
 658         /*
 659          * Metapage initialization
 660          */
 661         rc = metapage_init();
 662         if (rc) {
 663                 jfs_err("metapage_init failed w/rc = %d", rc);
 664                 goto free_slab;
 665         }
 666
 667         /*
 668          * Transaction Manager initialization
 669          */
 670         rc = txInit();
 671         if (rc) {
 672                 jfs_err("txInit failed w/rc = %d", rc);
 673                 goto free_metapage;
 674         }
 675
 676         /*
 677          * I/O completion thread (endio)
 678          */
 679         jfsIOthread = kernel_thread(jfsIOWait, NULL, CLONE_KERNEL);
 680         if (jfsIOthread < 0) {
 681                 jfs_err("init_jfs_fs: fork failed w/rc = %d", jfsIOthread);
 682                 goto end_txmngr;
 683         }
 684         wait_for_completion(&jfsIOwait);        /* Wait until thread starts */
 685
 686         if (commit_threads < 1)
 687                 commit_threads = num_online_cpus();
 688         if (commit_threads > MAX_COMMIT_THREADS)
 689                 commit_threads = MAX_COMMIT_THREADS;
 690
 691         for (i = 0; i < commit_threads; i++) {
 692                 jfsCommitThread[i] = kernel_thread(jfs_lazycommit, NULL,
 693                                                    CLONE_KERNEL);
 694                 if (jfsCommitThread[i] < 0) {
 695                         jfs_err("init_jfs_fs: fork failed w/rc = %d",
 696                                 jfsCommitThread[i]);
 697                         commit_threads = i;
 698                         goto kill_committask;
 699                 }
 700                 /* Wait until thread starts */
 701                 wait_for_completion(&jfsIOwait);
 702         }
 703
 704         jfsSyncThread = kernel_thread(jfs_sync, NULL, CLONE_KERNEL);
 705         if (jfsSyncThread < 0) {
 706                 jfs_err("init_jfs_fs: fork failed w/rc = %d", jfsSyncThread);
 707                 goto kill_committask;
 708         }
 709         wait_for_completion(&jfsIOwait);        /* Wait until thread starts */
 710
 711 #ifdef PROC_FS_JFS
 712         jfs_proc_init();
 713 #endif
 714
 715         return register_filesystem(&jfs_fs_type);
 716
 717 kill_committask:
 718         jfs_stop_threads = 1;
 719         wake_up_all(&jfs_commit_thread_wait);
 720         for (i = 0; i < commit_threads; i++)
 721                 wait_for_completion(&jfsIOwait);
 722
 723         wake_up(&jfs_IO_thread_wait);
 724         wait_for_completion(&jfsIOwait);        /* Wait for thread exit */
 725 end_txmngr:
 726         txExit();
 727 free_metapage:
 728         metapage_exit();
 729 free_slab:
 730         kmem_cache_destroy(jfs_inode_cachep);
 731         return rc;
 732 }
 733
 734 static void __exit exit_jfs_fs(void)
 735 {
 736         int i;
 737
 738         jfs_info("exit_jfs_fs called");
 739
 740         jfs_stop_threads = 1;
 741         txExit();
 742         metapage_exit();
 743         wake_up(&jfs_IO_thread_wait);
 744         wait_for_completion(&jfsIOwait);        /* Wait until IO thread exits */
 745         wake_up_all(&jfs_commit_thread_wait);
 746         for (i = 0; i < commit_threads; i++)
 747                 wait_for_completion(&jfsIOwait);
 748         wake_up(&jfs_sync_thread_wait);
 749         wait_for_completion(&jfsIOwait);        /* Wait until Sync thread exits */
 750 #ifdef PROC_FS_JFS
 751         jfs_proc_clean();
 752 #endif
 753         unregister_filesystem(&jfs_fs_type);
 754         kmem_cache_destroy(jfs_inode_cachep);
 755 }
 756
 757 module_init(init_jfs_fs)
 758 module_exit(exit_jfs_fs)