git.oblomov.eu Git - linux-2.6/blob - 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/module.h>
  22 #include <linux/parser.h>
  23 #include <linux/completion.h>
  24 #include <linux/vfs.h>
  25 #include <linux/mount.h>
  26 #include <linux/moduleparam.h>
  27 #include <linux/kthread.h>
  28 #include <linux/posix_acl.h>
  29 #include <linux/buffer_head.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 dentry *dentry, struct kstatfs *buf)
 143 {
 144         struct jfs_sb_info *sbi = JFS_SBI(dentry->d_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, Opt_uid, Opt_gid, Opt_umask
 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_uid, "uid=%u"},
 212         {Opt_gid, "gid=%u"},
 213         {Opt_umask, "umask=%u"},
 214         {Opt_err, NULL}
 215 };
 216
 217 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
 218                          int *flag)
 219 {
 220         void *nls_map = (void *)-1;     /* -1: no change;  NULL: none */
 221         char *p;
 222         struct jfs_sb_info *sbi = JFS_SBI(sb);
 223
 224         *newLVSize = 0;
 225
 226         if (!options)
 227                 return 1;
 228
 229         while ((p = strsep(&options, ",")) != NULL) {
 230                 substring_t args[MAX_OPT_ARGS];
 231                 int token;
 232                 if (!*p)
 233                         continue;
 234
 235                 token = match_token(p, tokens, args);
 236                 switch (token) {
 237                 case Opt_integrity:
 238                         *flag &= ~JFS_NOINTEGRITY;
 239                         break;
 240                 case Opt_nointegrity:
 241                         *flag |= JFS_NOINTEGRITY;
 242                         break;
 243                 case Opt_ignore:
 244                         /* Silently ignore the quota options */
 245                         /* Don't do anything ;-) */
 246                         break;
 247                 case Opt_iocharset:
 248                         if (nls_map && nls_map != (void *) -1)
 249                                 unload_nls(nls_map);
 250                         if (!strcmp(args[0].from, "none"))
 251                                 nls_map = NULL;
 252                         else {
 253                                 nls_map = load_nls(args[0].from);
 254                                 if (!nls_map) {
 255                                         printk(KERN_ERR
 256                                                "JFS: charset not found\n");
 257                                         goto cleanup;
 258                                 }
 259                         }
 260                         break;
 261                 case Opt_resize:
 262                 {
 263                         char *resize = args[0].from;
 264                         *newLVSize = simple_strtoull(resize, &resize, 0);
 265                         break;
 266                 }
 267                 case Opt_resize_nosize:
 268                 {
 269                         *newLVSize = sb->s_bdev->bd_inode->i_size >>
 270                                 sb->s_blocksize_bits;
 271                         if (*newLVSize == 0)
 272                                 printk(KERN_ERR
 273                                        "JFS: Cannot determine volume size\n");
 274                         break;
 275                 }
 276                 case Opt_errors:
 277                 {
 278                         char *errors = args[0].from;
 279                         if (!errors || !*errors)
 280                                 goto cleanup;
 281                         if (!strcmp(errors, "continue")) {
 282                                 *flag &= ~JFS_ERR_REMOUNT_RO;
 283                                 *flag &= ~JFS_ERR_PANIC;
 284                                 *flag |= JFS_ERR_CONTINUE;
 285                         } else if (!strcmp(errors, "remount-ro")) {
 286                                 *flag &= ~JFS_ERR_CONTINUE;
 287                                 *flag &= ~JFS_ERR_PANIC;
 288                                 *flag |= JFS_ERR_REMOUNT_RO;
 289                         } else if (!strcmp(errors, "panic")) {
 290                                 *flag &= ~JFS_ERR_CONTINUE;
 291                                 *flag &= ~JFS_ERR_REMOUNT_RO;
 292                                 *flag |= JFS_ERR_PANIC;
 293                         } else {
 294                                 printk(KERN_ERR
 295                                        "JFS: %s is an invalid error handler\n",
 296                                        errors);
 297                                 goto cleanup;
 298                         }
 299                         break;
 300                 }
 301
 302 #ifdef CONFIG_QUOTA
 303                 case Opt_quota:
 304                 case Opt_usrquota:
 305                         *flag |= JFS_USRQUOTA;
 306                         break;
 307                 case Opt_grpquota:
 308                         *flag |= JFS_GRPQUOTA;
 309                         break;
 310 #else
 311                 case Opt_usrquota:
 312                 case Opt_grpquota:
 313                 case Opt_quota:
 314                         printk(KERN_ERR
 315                                "JFS: quota operations not supported\n");
 316                         break;
 317 #endif
 318                 case Opt_uid:
 319                 {
 320                         char *uid = args[0].from;
 321                         sbi->uid = simple_strtoul(uid, &uid, 0);
 322                         break;
 323                 }
 324                 case Opt_gid:
 325                 {
 326                         char *gid = args[0].from;
 327                         sbi->gid = simple_strtoul(gid, &gid, 0);
 328                         break;
 329                 }
 330                 case Opt_umask:
 331                 {
 332                         char *umask = args[0].from;
 333                         sbi->umask = simple_strtoul(umask, &umask, 8);
 334                         if (sbi->umask & ~0777) {
 335                                 printk(KERN_ERR
 336                                        "JFS: Invalid value of umask\n");
 337                                 goto cleanup;
 338                         }
 339                         break;
 340                 }
 341                 default:
 342                         printk("jfs: Unrecognized mount option \"%s\" "
 343                                         " or missing value\n", p);
 344                         goto cleanup;
 345                 }
 346         }
 347
 348         if (nls_map != (void *) -1) {
 349                 /* Discard old (if remount) */
 350                 if (sbi->nls_tab)
 351                         unload_nls(sbi->nls_tab);
 352                 sbi->nls_tab = nls_map;
 353         }
 354         return 1;
 355
 356 cleanup:
 357         if (nls_map && nls_map != (void *) -1)
 358                 unload_nls(nls_map);
 359         return 0;
 360 }
 361
 362 static int jfs_remount(struct super_block *sb, int *flags, char *data)
 363 {
 364         s64 newLVSize = 0;
 365         int rc = 0;
 366         int flag = JFS_SBI(sb)->flag;
 367
 368         if (!parse_options(data, sb, &newLVSize, &flag)) {
 369                 return -EINVAL;
 370         }
 371         if (newLVSize) {
 372                 if (sb->s_flags & MS_RDONLY) {
 373                         printk(KERN_ERR
 374                   "JFS: resize requires volume to be mounted read-write\n");
 375                         return -EROFS;
 376                 }
 377                 rc = jfs_extendfs(sb, newLVSize, 0);
 378                 if (rc)
 379                         return rc;
 380         }
 381
 382         if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
 383                 /*
 384                  * Invalidate any previously read metadata.  fsck may have
 385                  * changed the on-disk data since we mounted r/o
 386                  */
 387                 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
 388
 389                 JFS_SBI(sb)->flag = flag;
 390                 return jfs_mount_rw(sb, 1);
 391         }
 392         if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
 393                 rc = jfs_umount_rw(sb);
 394                 JFS_SBI(sb)->flag = flag;
 395                 return rc;
 396         }
 397         if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
 398                 if (!(sb->s_flags & MS_RDONLY)) {
 399                         rc = jfs_umount_rw(sb);
 400                         if (rc)
 401                                 return rc;
 402                         JFS_SBI(sb)->flag = flag;
 403                         return jfs_mount_rw(sb, 1);
 404                 }
 405         JFS_SBI(sb)->flag = flag;
 406
 407         return 0;
 408 }
 409
 410 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
 411 {
 412         struct jfs_sb_info *sbi;
 413         struct inode *inode;
 414         int rc;
 415         s64 newLVSize = 0;
 416         int flag;
 417
 418         jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
 419
 420         if (!new_valid_dev(sb->s_bdev->bd_dev))
 421                 return -EOVERFLOW;
 422
 423         sbi = kzalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
 424         if (!sbi)
 425                 return -ENOMEM;
 426         sb->s_fs_info = sbi;
 427         sbi->sb = sb;
 428         sbi->uid = sbi->gid = sbi->umask = -1;
 429
 430         /* initialize the mount flag and determine the default error handler */
 431         flag = JFS_ERR_REMOUNT_RO;
 432
 433         if (!parse_options((char *) data, sb, &newLVSize, &flag)) {
 434                 kfree(sbi);
 435                 return -EINVAL;
 436         }
 437         sbi->flag = flag;
 438
 439 #ifdef CONFIG_JFS_POSIX_ACL
 440         sb->s_flags |= MS_POSIXACL;
 441 #endif
 442
 443         if (newLVSize) {
 444                 printk(KERN_ERR "resize option for remount only\n");
 445                 return -EINVAL;
 446         }
 447
 448         /*
 449          * Initialize blocksize to 4K.
 450          */
 451         sb_set_blocksize(sb, PSIZE);
 452
 453         /*
 454          * Set method vectors.
 455          */
 456         sb->s_op = &jfs_super_operations;
 457         sb->s_export_op = &jfs_export_operations;
 458
 459         /*
 460          * Initialize direct-mapping inode/address-space
 461          */
 462         inode = new_inode(sb);
 463         if (inode == NULL)
 464                 goto out_kfree;
 465         inode->i_ino = 0;
 466         inode->i_nlink = 1;
 467         inode->i_size = sb->s_bdev->bd_inode->i_size;
 468         inode->i_mapping->a_ops = &jfs_metapage_aops;
 469         insert_inode_hash(inode);
 470         mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
 471
 472         sbi->direct_inode = inode;
 473
 474         rc = jfs_mount(sb);
 475         if (rc) {
 476                 if (!silent) {
 477                         jfs_err("jfs_mount failed w/return code = %d", rc);
 478                 }
 479                 goto out_mount_failed;
 480         }
 481         if (sb->s_flags & MS_RDONLY)
 482                 sbi->log = NULL;
 483         else {
 484                 rc = jfs_mount_rw(sb, 0);
 485                 if (rc) {
 486                         if (!silent) {
 487                                 jfs_err("jfs_mount_rw failed, return code = %d",
 488                                         rc);
 489                         }
 490                         goto out_no_rw;
 491                 }
 492         }
 493
 494         sb->s_magic = JFS_SUPER_MAGIC;
 495
 496         inode = iget(sb, ROOT_I);
 497         if (!inode || is_bad_inode(inode))
 498                 goto out_no_root;
 499         sb->s_root = d_alloc_root(inode);
 500         if (!sb->s_root)
 501                 goto out_no_root;
 502
 503         if (sbi->mntflag & JFS_OS2)
 504                 sb->s_root->d_op = &jfs_ci_dentry_operations;
 505
 506         /* logical blocks are represented by 40 bits in pxd_t, etc. */
 507         sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
 508 #if BITS_PER_LONG == 32
 509         /*
 510          * Page cache is indexed by long.
 511          * I would use MAX_LFS_FILESIZE, but it's only half as big
 512          */
 513         sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, sb->s_maxbytes);
 514 #endif
 515         sb->s_time_gran = 1;
 516         return 0;
 517
 518 out_no_root:
 519         jfs_err("jfs_read_super: get root inode failed");
 520         if (inode)
 521                 iput(inode);
 522
 523 out_no_rw:
 524         rc = jfs_umount(sb);
 525         if (rc) {
 526                 jfs_err("jfs_umount failed with return code %d", rc);
 527         }
 528 out_mount_failed:
 529         filemap_write_and_wait(sbi->direct_inode->i_mapping);
 530         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
 531         make_bad_inode(sbi->direct_inode);
 532         iput(sbi->direct_inode);
 533         sbi->direct_inode = NULL;
 534 out_kfree:
 535         if (sbi->nls_tab)
 536                 unload_nls(sbi->nls_tab);
 537         kfree(sbi);
 538         return -EINVAL;
 539 }
 540
 541 static void jfs_write_super_lockfs(struct super_block *sb)
 542 {
 543         struct jfs_sb_info *sbi = JFS_SBI(sb);
 544         struct jfs_log *log = sbi->log;
 545
 546         if (!(sb->s_flags & MS_RDONLY)) {
 547                 txQuiesce(sb);
 548                 lmLogShutdown(log);
 549                 updateSuper(sb, FM_CLEAN);
 550         }
 551 }
 552
 553 static void jfs_unlockfs(struct super_block *sb)
 554 {
 555         struct jfs_sb_info *sbi = JFS_SBI(sb);
 556         struct jfs_log *log = sbi->log;
 557         int rc = 0;
 558
 559         if (!(sb->s_flags & MS_RDONLY)) {
 560                 updateSuper(sb, FM_MOUNT);
 561                 if ((rc = lmLogInit(log)))
 562                         jfs_err("jfs_unlock failed with return code %d", rc);
 563                 else
 564                         txResume(sb);
 565         }
 566 }
 567
 568 static int jfs_get_sb(struct file_system_type *fs_type,
 569         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 570 {
 571         return get_sb_bdev(fs_type, flags, dev_name, data, jfs_fill_super,
 572                            mnt);
 573 }
 574
 575 static int jfs_sync_fs(struct super_block *sb, int wait)
 576 {
 577         struct jfs_log *log = JFS_SBI(sb)->log;
 578
 579         /* log == NULL indicates read-only mount */
 580         if (log) {
 581                 jfs_flush_journal(log, wait);
 582                 jfs_syncpt(log, 0);
 583         }
 584
 585         return 0;
 586 }
 587
 588 static int jfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
 589 {
 590         struct jfs_sb_info *sbi = JFS_SBI(vfs->mnt_sb);
 591
 592         if (sbi->uid != -1)
 593                 seq_printf(seq, ",uid=%d", sbi->uid);
 594         if (sbi->gid != -1)
 595                 seq_printf(seq, ",gid=%d", sbi->gid);
 596         if (sbi->umask != -1)
 597                 seq_printf(seq, ",umask=%03o", sbi->umask);
 598         if (sbi->flag & JFS_NOINTEGRITY)
 599                 seq_puts(seq, ",nointegrity");
 600
 601 #ifdef CONFIG_QUOTA
 602         if (sbi->flag & JFS_USRQUOTA)
 603                 seq_puts(seq, ",usrquota");
 604
 605         if (sbi->flag & JFS_GRPQUOTA)
 606                 seq_puts(seq, ",grpquota");
 607 #endif
 608
 609         return 0;
 610 }
 611
 612 #ifdef CONFIG_QUOTA
 613
 614 /* Read data from quotafile - avoid pagecache and such because we cannot afford
 615  * acquiring the locks... As quota files are never truncated and quota code
 616  * itself serializes the operations (and noone else should touch the files)
 617  * we don't have to be afraid of races */
 618 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
 619                               size_t len, loff_t off)
 620 {
 621         struct inode *inode = sb_dqopt(sb)->files[type];
 622         sector_t blk = off >> sb->s_blocksize_bits;
 623         int err = 0;
 624         int offset = off & (sb->s_blocksize - 1);
 625         int tocopy;
 626         size_t toread;
 627         struct buffer_head tmp_bh;
 628         struct buffer_head *bh;
 629         loff_t i_size = i_size_read(inode);
 630
 631         if (off > i_size)
 632                 return 0;
 633         if (off+len > i_size)
 634                 len = i_size-off;
 635         toread = len;
 636         while (toread > 0) {
 637                 tocopy = sb->s_blocksize - offset < toread ?
 638                                 sb->s_blocksize - offset : toread;
 639
 640                 tmp_bh.b_state = 0;
 641                 tmp_bh.b_size = 1 << inode->i_blkbits;
 642                 err = jfs_get_block(inode, blk, &tmp_bh, 0);
 643                 if (err)
 644                         return err;
 645                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
 646                         memset(data, 0, tocopy);
 647                 else {
 648                         bh = sb_bread(sb, tmp_bh.b_blocknr);
 649                         if (!bh)
 650                                 return -EIO;
 651                         memcpy(data, bh->b_data+offset, tocopy);
 652                         brelse(bh);
 653                 }
 654                 offset = 0;
 655                 toread -= tocopy;
 656                 data += tocopy;
 657                 blk++;
 658         }
 659         return len;
 660 }
 661
 662 /* Write to quotafile */
 663 static ssize_t jfs_quota_write(struct super_block *sb, int type,
 664                                const char *data, size_t len, loff_t off)
 665 {
 666         struct inode *inode = sb_dqopt(sb)->files[type];
 667         sector_t blk = off >> sb->s_blocksize_bits;
 668         int err = 0;
 669         int offset = off & (sb->s_blocksize - 1);
 670         int tocopy;
 671         size_t towrite = len;
 672         struct buffer_head tmp_bh;
 673         struct buffer_head *bh;
 674
 675         mutex_lock(&inode->i_mutex);
 676         while (towrite > 0) {
 677                 tocopy = sb->s_blocksize - offset < towrite ?
 678                                 sb->s_blocksize - offset : towrite;
 679
 680                 tmp_bh.b_state = 0;
 681                 tmp_bh.b_size = 1 << inode->i_blkbits;
 682                 err = jfs_get_block(inode, blk, &tmp_bh, 1);
 683                 if (err)
 684                         goto out;
 685                 if (offset || tocopy != sb->s_blocksize)
 686                         bh = sb_bread(sb, tmp_bh.b_blocknr);
 687                 else
 688                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
 689                 if (!bh) {
 690                         err = -EIO;
 691                         goto out;
 692                 }
 693                 lock_buffer(bh);
 694                 memcpy(bh->b_data+offset, data, tocopy);
 695                 flush_dcache_page(bh->b_page);
 696                 set_buffer_uptodate(bh);
 697                 mark_buffer_dirty(bh);
 698                 unlock_buffer(bh);
 699                 brelse(bh);
 700                 offset = 0;
 701                 towrite -= tocopy;
 702                 data += tocopy;
 703                 blk++;
 704         }
 705 out:
 706         if (len == towrite)
 707                 return err;
 708         if (inode->i_size < off+len-towrite)
 709                 i_size_write(inode, off+len-towrite);
 710         inode->i_version++;
 711         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
 712         mark_inode_dirty(inode);
 713         mutex_unlock(&inode->i_mutex);
 714         return len - towrite;
 715 }
 716
 717 #endif
 718
 719 static struct super_operations jfs_super_operations = {
 720         .alloc_inode    = jfs_alloc_inode,
 721         .destroy_inode  = jfs_destroy_inode,
 722         .read_inode     = jfs_read_inode,
 723         .dirty_inode    = jfs_dirty_inode,
 724         .write_inode    = jfs_write_inode,
 725         .delete_inode   = jfs_delete_inode,
 726         .put_super      = jfs_put_super,
 727         .sync_fs        = jfs_sync_fs,
 728         .write_super_lockfs = jfs_write_super_lockfs,
 729         .unlockfs       = jfs_unlockfs,
 730         .statfs         = jfs_statfs,
 731         .remount_fs     = jfs_remount,
 732         .show_options   = jfs_show_options,
 733 #ifdef CONFIG_QUOTA
 734         .quota_read     = jfs_quota_read,
 735         .quota_write    = jfs_quota_write,
 736 #endif
 737 };
 738
 739 static struct export_operations jfs_export_operations = {
 740         .get_parent     = jfs_get_parent,
 741 };
 742
 743 static struct file_system_type jfs_fs_type = {
 744         .owner          = THIS_MODULE,
 745         .name           = "jfs",
 746         .get_sb         = jfs_get_sb,
 747         .kill_sb        = kill_block_super,
 748         .fs_flags       = FS_REQUIRES_DEV,
 749 };
 750
 751 static void init_once(void *foo, kmem_cache_t * cachep, unsigned long flags)
 752 {
 753         struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
 754
 755         if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
 756             SLAB_CTOR_CONSTRUCTOR) {
 757                 memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
 758                 INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
 759                 init_rwsem(&jfs_ip->rdwrlock);
 760                 mutex_init(&jfs_ip->commit_mutex);
 761                 init_rwsem(&jfs_ip->xattr_sem);
 762                 spin_lock_init(&jfs_ip->ag_lock);
 763                 jfs_ip->active_ag = -1;
 764 #ifdef CONFIG_JFS_POSIX_ACL
 765                 jfs_ip->i_acl = JFS_ACL_NOT_CACHED;
 766                 jfs_ip->i_default_acl = JFS_ACL_NOT_CACHED;
 767 #endif
 768                 inode_init_once(&jfs_ip->vfs_inode);
 769         }
 770 }
 771
 772 static int __init init_jfs_fs(void)
 773 {
 774         int i;
 775         int rc;
 776
 777         jfs_inode_cachep =
 778             kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
 779                             SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
 780                             init_once, NULL);
 781         if (jfs_inode_cachep == NULL)
 782                 return -ENOMEM;
 783
 784         /*
 785          * Metapage initialization
 786          */
 787         rc = metapage_init();
 788         if (rc) {
 789                 jfs_err("metapage_init failed w/rc = %d", rc);
 790                 goto free_slab;
 791         }
 792
 793         /*
 794          * Transaction Manager initialization
 795          */
 796         rc = txInit();
 797         if (rc) {
 798                 jfs_err("txInit failed w/rc = %d", rc);
 799                 goto free_metapage;
 800         }
 801
 802         /*
 803          * I/O completion thread (endio)
 804          */
 805         jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
 806         if (IS_ERR(jfsIOthread)) {
 807                 rc = PTR_ERR(jfsIOthread);
 808                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
 809                 goto end_txmngr;
 810         }
 811
 812         if (commit_threads < 1)
 813                 commit_threads = num_online_cpus();
 814         if (commit_threads > MAX_COMMIT_THREADS)
 815                 commit_threads = MAX_COMMIT_THREADS;
 816
 817         for (i = 0; i < commit_threads; i++) {
 818                 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, "jfsCommit");
 819                 if (IS_ERR(jfsCommitThread[i])) {
 820                         rc = PTR_ERR(jfsCommitThread[i]);
 821                         jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
 822                         commit_threads = i;
 823                         goto kill_committask;
 824                 }
 825         }
 826
 827         jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
 828         if (IS_ERR(jfsSyncThread)) {
 829                 rc = PTR_ERR(jfsSyncThread);
 830                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
 831                 goto kill_committask;
 832         }
 833
 834 #ifdef PROC_FS_JFS
 835         jfs_proc_init();
 836 #endif
 837
 838         return register_filesystem(&jfs_fs_type);
 839
 840 kill_committask:
 841         for (i = 0; i < commit_threads; i++)
 842                 kthread_stop(jfsCommitThread[i]);
 843         kthread_stop(jfsIOthread);
 844 end_txmngr:
 845         txExit();
 846 free_metapage:
 847         metapage_exit();
 848 free_slab:
 849         kmem_cache_destroy(jfs_inode_cachep);
 850         return rc;
 851 }
 852
 853 static void __exit exit_jfs_fs(void)
 854 {
 855         int i;
 856
 857         jfs_info("exit_jfs_fs called");
 858
 859         txExit();
 860         metapage_exit();
 861
 862         kthread_stop(jfsIOthread);
 863         for (i = 0; i < commit_threads; i++)
 864                 kthread_stop(jfsCommitThread[i]);
 865         kthread_stop(jfsSyncThread);
 866 #ifdef PROC_FS_JFS
 867         jfs_proc_clean();
 868 #endif
 869         unregister_filesystem(&jfs_fs_type);
 870         kmem_cache_destroy(jfs_inode_cachep);
 871 }
 872
 873 module_init(init_jfs_fs)
 874 module_exit(exit_jfs_fs)