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/quotaops.h>
  26 #include <linux/mount.h>
  27 #include <linux/moduleparam.h>
  28 #include <linux/kthread.h>
  29 #include <linux/posix_acl.h>
  30 #include <linux/buffer_head.h>
  31 #include <linux/exportfs.h>
  32 #include <linux/crc32.h>
  33 #include <linux/slab.h>
  34 #include <asm/uaccess.h>
  35 #include <linux/seq_file.h>
  36
  37 #include "jfs_incore.h"
  38 #include "jfs_filsys.h"
  39 #include "jfs_inode.h"
  40 #include "jfs_metapage.h"
  41 #include "jfs_superblock.h"
  42 #include "jfs_dmap.h"
  43 #include "jfs_imap.h"
  44 #include "jfs_acl.h"
  45 #include "jfs_debug.h"
  46
  47 MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
  48 MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
  49 MODULE_LICENSE("GPL");
  50
  51 static struct kmem_cache * jfs_inode_cachep;
  52
  53 static const struct super_operations jfs_super_operations;
  54 static const struct export_operations jfs_export_operations;
  55 static struct file_system_type jfs_fs_type;
  56
  57 #define MAX_COMMIT_THREADS 64
  58 static int commit_threads = 0;
  59 module_param(commit_threads, int, 0);
  60 MODULE_PARM_DESC(commit_threads, "Number of commit threads");
  61
  62 static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS];
  63 struct task_struct *jfsIOthread;
  64 struct task_struct *jfsSyncThread;
  65
  66 #ifdef CONFIG_JFS_DEBUG
  67 int jfsloglevel = JFS_LOGLEVEL_WARN;
  68 module_param(jfsloglevel, int, 0644);
  69 MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
  70 #endif
  71
  72 static void jfs_handle_error(struct super_block *sb)
  73 {
  74         struct jfs_sb_info *sbi = JFS_SBI(sb);
  75
  76         if (sb->s_flags & MS_RDONLY)
  77                 return;
  78
  79         updateSuper(sb, FM_DIRTY);
  80
  81         if (sbi->flag & JFS_ERR_PANIC)
  82                 panic("JFS (device %s): panic forced after error\n",
  83                         sb->s_id);
  84         else if (sbi->flag & JFS_ERR_REMOUNT_RO) {
  85                 jfs_err("ERROR: (device %s): remounting filesystem "
  86                         "as read-only\n",
  87                         sb->s_id);
  88                 sb->s_flags |= MS_RDONLY;
  89         }
  90
  91         /* nothing is done for continue beyond marking the superblock dirty */
  92 }
  93
  94 void jfs_error(struct super_block *sb, const char * function, ...)
  95 {
  96         static char error_buf[256];
  97         va_list args;
  98
  99         va_start(args, function);
 100         vsnprintf(error_buf, sizeof(error_buf), function, args);
 101         va_end(args);
 102
 103         printk(KERN_ERR "ERROR: (device %s): %s\n", sb->s_id, error_buf);
 104
 105         jfs_handle_error(sb);
 106 }
 107
 108 static struct inode *jfs_alloc_inode(struct super_block *sb)
 109 {
 110         struct jfs_inode_info *jfs_inode;
 111
 112         jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS);
 113         if (!jfs_inode)
 114                 return NULL;
 115         return &jfs_inode->vfs_inode;
 116 }
 117
 118 static void jfs_i_callback(struct rcu_head *head)
 119 {
 120         struct inode *inode = container_of(head, struct inode, i_rcu);
 121         struct jfs_inode_info *ji = JFS_IP(inode);
 122         kmem_cache_free(jfs_inode_cachep, ji);
 123 }
 124
 125 static void jfs_destroy_inode(struct inode *inode)
 126 {
 127         struct jfs_inode_info *ji = JFS_IP(inode);
 128
 129         BUG_ON(!list_empty(&ji->anon_inode_list));
 130
 131         spin_lock_irq(&ji->ag_lock);
 132         if (ji->active_ag != -1) {
 133                 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
 134                 atomic_dec(&bmap->db_active[ji->active_ag]);
 135                 ji->active_ag = -1;
 136         }
 137         spin_unlock_irq(&ji->ag_lock);
 138         call_rcu(&inode->i_rcu, jfs_i_callback);
 139 }
 140
 141 static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 142 {
 143         struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb);
 144         s64 maxinodes;
 145         struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
 146
 147         jfs_info("In jfs_statfs");
 148         buf->f_type = JFS_SUPER_MAGIC;
 149         buf->f_bsize = sbi->bsize;
 150         buf->f_blocks = sbi->bmap->db_mapsize;
 151         buf->f_bfree = sbi->bmap->db_nfree;
 152         buf->f_bavail = sbi->bmap->db_nfree;
 153         /*
 154          * If we really return the number of allocated & free inodes, some
 155          * applications will fail because they won't see enough free inodes.
 156          * We'll try to calculate some guess as to how may inodes we can
 157          * really allocate
 158          *
 159          * buf->f_files = atomic_read(&imap->im_numinos);
 160          * buf->f_ffree = atomic_read(&imap->im_numfree);
 161          */
 162         maxinodes = min((s64) atomic_read(&imap->im_numinos) +
 163                         ((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
 164                          << L2INOSPEREXT), (s64) 0xffffffffLL);
 165         buf->f_files = maxinodes;
 166         buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
 167                                     atomic_read(&imap->im_numfree));
 168         buf->f_fsid.val[0] = (u32)crc32_le(0, sbi->uuid, sizeof(sbi->uuid)/2);
 169         buf->f_fsid.val[1] = (u32)crc32_le(0, sbi->uuid + sizeof(sbi->uuid)/2,
 170                                         sizeof(sbi->uuid)/2);
 171
 172         buf->f_namelen = JFS_NAME_MAX;
 173         return 0;
 174 }
 175
 176 static void jfs_put_super(struct super_block *sb)
 177 {
 178         struct jfs_sb_info *sbi = JFS_SBI(sb);
 179         int rc;
 180
 181         jfs_info("In jfs_put_super");
 182
 183         dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
 184
 185         rc = jfs_umount(sb);
 186         if (rc)
 187                 jfs_err("jfs_umount failed with return code %d", rc);
 188
 189         unload_nls(sbi->nls_tab);
 190
 191         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
 192         iput(sbi->direct_inode);
 193
 194         kfree(sbi);
 195 }
 196
 197 enum {
 198         Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
 199         Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota,
 200         Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask
 201 };
 202
 203 static const match_table_t tokens = {
 204         {Opt_integrity, "integrity"},
 205         {Opt_nointegrity, "nointegrity"},
 206         {Opt_iocharset, "iocharset=%s"},
 207         {Opt_resize, "resize=%u"},
 208         {Opt_resize_nosize, "resize"},
 209         {Opt_errors, "errors=%s"},
 210         {Opt_ignore, "noquota"},
 211         {Opt_ignore, "quota"},
 212         {Opt_usrquota, "usrquota"},
 213         {Opt_grpquota, "grpquota"},
 214         {Opt_uid, "uid=%u"},
 215         {Opt_gid, "gid=%u"},
 216         {Opt_umask, "umask=%u"},
 217         {Opt_err, NULL}
 218 };
 219
 220 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
 221                          int *flag)
 222 {
 223         void *nls_map = (void *)-1;     /* -1: no change;  NULL: none */
 224         char *p;
 225         struct jfs_sb_info *sbi = JFS_SBI(sb);
 226
 227         *newLVSize = 0;
 228
 229         if (!options)
 230                 return 1;
 231
 232         while ((p = strsep(&options, ",")) != NULL) {
 233                 substring_t args[MAX_OPT_ARGS];
 234                 int token;
 235                 if (!*p)
 236                         continue;
 237
 238                 token = match_token(p, tokens, args);
 239                 switch (token) {
 240                 case Opt_integrity:
 241                         *flag &= ~JFS_NOINTEGRITY;
 242                         break;
 243                 case Opt_nointegrity:
 244                         *flag |= JFS_NOINTEGRITY;
 245                         break;
 246                 case Opt_ignore:
 247                         /* Silently ignore the quota options */
 248                         /* Don't do anything ;-) */
 249                         break;
 250                 case Opt_iocharset:
 251                         if (nls_map && nls_map != (void *) -1)
 252                                 unload_nls(nls_map);
 253                         if (!strcmp(args[0].from, "none"))
 254                                 nls_map = NULL;
 255                         else {
 256                                 nls_map = load_nls(args[0].from);
 257                                 if (!nls_map) {
 258                                         printk(KERN_ERR
 259                                                "JFS: charset not found\n");
 260                                         goto cleanup;
 261                                 }
 262                         }
 263                         break;
 264                 case Opt_resize:
 265                 {
 266                         char *resize = args[0].from;
 267                         *newLVSize = simple_strtoull(resize, &resize, 0);
 268                         break;
 269                 }
 270                 case Opt_resize_nosize:
 271                 {
 272                         *newLVSize = sb->s_bdev->bd_inode->i_size >>
 273                                 sb->s_blocksize_bits;
 274                         if (*newLVSize == 0)
 275                                 printk(KERN_ERR
 276                                        "JFS: Cannot determine volume size\n");
 277                         break;
 278                 }
 279                 case Opt_errors:
 280                 {
 281                         char *errors = args[0].from;
 282                         if (!errors || !*errors)
 283                                 goto cleanup;
 284                         if (!strcmp(errors, "continue")) {
 285                                 *flag &= ~JFS_ERR_REMOUNT_RO;
 286                                 *flag &= ~JFS_ERR_PANIC;
 287                                 *flag |= JFS_ERR_CONTINUE;
 288                         } else if (!strcmp(errors, "remount-ro")) {
 289                                 *flag &= ~JFS_ERR_CONTINUE;
 290                                 *flag &= ~JFS_ERR_PANIC;
 291                                 *flag |= JFS_ERR_REMOUNT_RO;
 292                         } else if (!strcmp(errors, "panic")) {
 293                                 *flag &= ~JFS_ERR_CONTINUE;
 294                                 *flag &= ~JFS_ERR_REMOUNT_RO;
 295                                 *flag |= JFS_ERR_PANIC;
 296                         } else {
 297                                 printk(KERN_ERR
 298                                        "JFS: %s is an invalid error handler\n",
 299                                        errors);
 300                                 goto cleanup;
 301                         }
 302                         break;
 303                 }
 304
 305 #ifdef CONFIG_QUOTA
 306                 case Opt_quota:
 307                 case Opt_usrquota:
 308                         *flag |= JFS_USRQUOTA;
 309                         break;
 310                 case Opt_grpquota:
 311                         *flag |= JFS_GRPQUOTA;
 312                         break;
 313 #else
 314                 case Opt_usrquota:
 315                 case Opt_grpquota:
 316                 case Opt_quota:
 317                         printk(KERN_ERR
 318                                "JFS: quota operations not supported\n");
 319                         break;
 320 #endif
 321                 case Opt_uid:
 322                 {
 323                         char *uid = args[0].from;
 324                         uid_t val = simple_strtoul(uid, &uid, 0);
 325                         sbi->uid = make_kuid(current_user_ns(), val);
 326                         if (!uid_valid(sbi->uid))
 327                                 goto cleanup;
 328                         break;
 329                 }
 330                 case Opt_gid:
 331                 {
 332                         char *gid = args[0].from;
 333                         gid_t val = simple_strtoul(gid, &gid, 0);
 334                         sbi->gid = make_kgid(current_user_ns(), val);
 335                         if (!gid_valid(sbi->gid))
 336                                 goto cleanup;
 337                         break;
 338                 }
 339                 case Opt_umask:
 340                 {
 341                         char *umask = args[0].from;
 342                         sbi->umask = simple_strtoul(umask, &umask, 8);
 343                         if (sbi->umask & ~0777) {
 344                                 printk(KERN_ERR
 345                                        "JFS: Invalid value of umask\n");
 346                                 goto cleanup;
 347                         }
 348                         break;
 349                 }
 350                 default:
 351                         printk("jfs: Unrecognized mount option \"%s\" "
 352                                         " or missing value\n", p);
 353                         goto cleanup;
 354                 }
 355         }
 356
 357         if (nls_map != (void *) -1) {
 358                 /* Discard old (if remount) */
 359                 unload_nls(sbi->nls_tab);
 360                 sbi->nls_tab = nls_map;
 361         }
 362         return 1;
 363
 364 cleanup:
 365         if (nls_map && nls_map != (void *) -1)
 366                 unload_nls(nls_map);
 367         return 0;
 368 }
 369
 370 static int jfs_remount(struct super_block *sb, int *flags, char *data)
 371 {
 372         s64 newLVSize = 0;
 373         int rc = 0;
 374         int flag = JFS_SBI(sb)->flag;
 375         int ret;
 376
 377         if (!parse_options(data, sb, &newLVSize, &flag)) {
 378                 return -EINVAL;
 379         }
 380
 381         if (newLVSize) {
 382                 if (sb->s_flags & MS_RDONLY) {
 383                         printk(KERN_ERR
 384                   "JFS: resize requires volume to be mounted read-write\n");
 385                         return -EROFS;
 386                 }
 387                 rc = jfs_extendfs(sb, newLVSize, 0);
 388                 if (rc)
 389                         return rc;
 390         }
 391
 392         if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
 393                 /*
 394                  * Invalidate any previously read metadata.  fsck may have
 395                  * changed the on-disk data since we mounted r/o
 396                  */
 397                 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
 398
 399                 JFS_SBI(sb)->flag = flag;
 400                 ret = jfs_mount_rw(sb, 1);
 401
 402                 /* mark the fs r/w for quota activity */
 403                 sb->s_flags &= ~MS_RDONLY;
 404
 405                 dquot_resume(sb, -1);
 406                 return ret;
 407         }
 408         if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
 409                 rc = dquot_suspend(sb, -1);
 410                 if (rc < 0) {
 411                         return rc;
 412                 }
 413                 rc = jfs_umount_rw(sb);
 414                 JFS_SBI(sb)->flag = flag;
 415                 return rc;
 416         }
 417         if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
 418                 if (!(sb->s_flags & MS_RDONLY)) {
 419                         rc = jfs_umount_rw(sb);
 420                         if (rc)
 421                                 return rc;
 422
 423                         JFS_SBI(sb)->flag = flag;
 424                         ret = jfs_mount_rw(sb, 1);
 425                         return ret;
 426                 }
 427         JFS_SBI(sb)->flag = flag;
 428
 429         return 0;
 430 }
 431
 432 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
 433 {
 434         struct jfs_sb_info *sbi;
 435         struct inode *inode;
 436         int rc;
 437         s64 newLVSize = 0;
 438         int flag, ret = -EINVAL;
 439
 440         jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
 441
 442         if (!new_valid_dev(sb->s_bdev->bd_dev))
 443                 return -EOVERFLOW;
 444
 445         sbi = kzalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
 446         if (!sbi)
 447                 return -ENOMEM;
 448
 449         sb->s_fs_info = sbi;
 450         sb->s_max_links = JFS_LINK_MAX;
 451         sbi->sb = sb;
 452         sbi->uid = INVALID_UID;
 453         sbi->gid = INVALID_GID;
 454         sbi->umask = -1;
 455
 456         /* initialize the mount flag and determine the default error handler */
 457         flag = JFS_ERR_REMOUNT_RO;
 458
 459         if (!parse_options((char *) data, sb, &newLVSize, &flag))
 460                 goto out_kfree;
 461         sbi->flag = flag;
 462
 463 #ifdef CONFIG_JFS_POSIX_ACL
 464         sb->s_flags |= MS_POSIXACL;
 465 #endif
 466
 467         if (newLVSize) {
 468                 printk(KERN_ERR "resize option for remount only\n");
 469                 goto out_kfree;
 470         }
 471
 472         /*
 473          * Initialize blocksize to 4K.
 474          */
 475         sb_set_blocksize(sb, PSIZE);
 476
 477         /*
 478          * Set method vectors.
 479          */
 480         sb->s_op = &jfs_super_operations;
 481         sb->s_export_op = &jfs_export_operations;
 482 #ifdef CONFIG_QUOTA
 483         sb->dq_op = &dquot_operations;
 484         sb->s_qcop = &dquot_quotactl_ops;
 485 #endif
 486
 487         /*
 488          * Initialize direct-mapping inode/address-space
 489          */
 490         inode = new_inode(sb);
 491         if (inode == NULL) {
 492                 ret = -ENOMEM;
 493                 goto out_unload;
 494         }
 495         inode->i_ino = 0;
 496         inode->i_size = sb->s_bdev->bd_inode->i_size;
 497         inode->i_mapping->a_ops = &jfs_metapage_aops;
 498         insert_inode_hash(inode);
 499         mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
 500
 501         sbi->direct_inode = inode;
 502
 503         rc = jfs_mount(sb);
 504         if (rc) {
 505                 if (!silent) {
 506                         jfs_err("jfs_mount failed w/return code = %d", rc);
 507                 }
 508                 goto out_mount_failed;
 509         }
 510         if (sb->s_flags & MS_RDONLY)
 511                 sbi->log = NULL;
 512         else {
 513                 rc = jfs_mount_rw(sb, 0);
 514                 if (rc) {
 515                         if (!silent) {
 516                                 jfs_err("jfs_mount_rw failed, return code = %d",
 517                                         rc);
 518                         }
 519                         goto out_no_rw;
 520                 }
 521         }
 522
 523         sb->s_magic = JFS_SUPER_MAGIC;
 524
 525         if (sbi->mntflag & JFS_OS2)
 526                 sb->s_d_op = &jfs_ci_dentry_operations;
 527
 528         inode = jfs_iget(sb, ROOT_I);
 529         if (IS_ERR(inode)) {
 530                 ret = PTR_ERR(inode);
 531                 goto out_no_rw;
 532         }
 533         sb->s_root = d_make_root(inode);
 534         if (!sb->s_root)
 535                 goto out_no_root;
 536
 537         /* logical blocks are represented by 40 bits in pxd_t, etc. */
 538         sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
 539 #if BITS_PER_LONG == 32
 540         /*
 541          * Page cache is indexed by long.
 542          * I would use MAX_LFS_FILESIZE, but it's only half as big
 543          */
 544         sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, (u64)sb->s_maxbytes);
 545 #endif
 546         sb->s_time_gran = 1;
 547         return 0;
 548
 549 out_no_root:
 550         jfs_err("jfs_read_super: get root dentry failed");
 551
 552 out_no_rw:
 553         rc = jfs_umount(sb);
 554         if (rc) {
 555                 jfs_err("jfs_umount failed with return code %d", rc);
 556         }
 557 out_mount_failed:
 558         filemap_write_and_wait(sbi->direct_inode->i_mapping);
 559         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
 560         make_bad_inode(sbi->direct_inode);
 561         iput(sbi->direct_inode);
 562         sbi->direct_inode = NULL;
 563 out_unload:
 564         if (sbi->nls_tab)
 565                 unload_nls(sbi->nls_tab);
 566 out_kfree:
 567         kfree(sbi);
 568         return ret;
 569 }
 570
 571 static int jfs_freeze(struct super_block *sb)
 572 {
 573         struct jfs_sb_info *sbi = JFS_SBI(sb);
 574         struct jfs_log *log = sbi->log;
 575
 576         if (!(sb->s_flags & MS_RDONLY)) {
 577                 txQuiesce(sb);
 578                 lmLogShutdown(log);
 579                 updateSuper(sb, FM_CLEAN);
 580         }
 581         return 0;
 582 }
 583
 584 static int jfs_unfreeze(struct super_block *sb)
 585 {
 586         struct jfs_sb_info *sbi = JFS_SBI(sb);
 587         struct jfs_log *log = sbi->log;
 588         int rc = 0;
 589
 590         if (!(sb->s_flags & MS_RDONLY)) {
 591                 updateSuper(sb, FM_MOUNT);
 592                 if ((rc = lmLogInit(log)))
 593                         jfs_err("jfs_unlock failed with return code %d", rc);
 594                 else
 595                         txResume(sb);
 596         }
 597         return 0;
 598 }
 599
 600 static struct dentry *jfs_do_mount(struct file_system_type *fs_type,
 601         int flags, const char *dev_name, void *data)
 602 {
 603         return mount_bdev(fs_type, flags, dev_name, data, jfs_fill_super);
 604 }
 605
 606 static int jfs_sync_fs(struct super_block *sb, int wait)
 607 {
 608         struct jfs_log *log = JFS_SBI(sb)->log;
 609
 610         /* log == NULL indicates read-only mount */
 611         if (log) {
 612                 /*
 613                  * Write quota structures to quota file, sync_blockdev() will
 614                  * write them to disk later
 615                  */
 616                 dquot_writeback_dquots(sb, -1);
 617                 jfs_flush_journal(log, wait);
 618                 jfs_syncpt(log, 0);
 619         }
 620
 621         return 0;
 622 }
 623
 624 static int jfs_show_options(struct seq_file *seq, struct dentry *root)
 625 {
 626         struct jfs_sb_info *sbi = JFS_SBI(root->d_sb);
 627
 628         if (uid_valid(sbi->uid))
 629                 seq_printf(seq, ",uid=%d", from_kuid(&init_user_ns, sbi->uid));
 630         if (gid_valid(sbi->gid))
 631                 seq_printf(seq, ",gid=%d", from_kgid(&init_user_ns, sbi->gid));
 632         if (sbi->umask != -1)
 633                 seq_printf(seq, ",umask=%03o", sbi->umask);
 634         if (sbi->flag & JFS_NOINTEGRITY)
 635                 seq_puts(seq, ",nointegrity");
 636         if (sbi->nls_tab)
 637                 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset);
 638         if (sbi->flag & JFS_ERR_CONTINUE)
 639                 seq_printf(seq, ",errors=continue");
 640         if (sbi->flag & JFS_ERR_PANIC)
 641                 seq_printf(seq, ",errors=panic");
 642
 643 #ifdef CONFIG_QUOTA
 644         if (sbi->flag & JFS_USRQUOTA)
 645                 seq_puts(seq, ",usrquota");
 646
 647         if (sbi->flag & JFS_GRPQUOTA)
 648                 seq_puts(seq, ",grpquota");
 649 #endif
 650
 651         return 0;
 652 }
 653
 654 #ifdef CONFIG_QUOTA
 655
 656 /* Read data from quotafile - avoid pagecache and such because we cannot afford
 657  * acquiring the locks... As quota files are never truncated and quota code
 658  * itself serializes the operations (and no one else should touch the files)
 659  * we don't have to be afraid of races */
 660 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
 661                               size_t len, loff_t off)
 662 {
 663         struct inode *inode = sb_dqopt(sb)->files[type];
 664         sector_t blk = off >> sb->s_blocksize_bits;
 665         int err = 0;
 666         int offset = off & (sb->s_blocksize - 1);
 667         int tocopy;
 668         size_t toread;
 669         struct buffer_head tmp_bh;
 670         struct buffer_head *bh;
 671         loff_t i_size = i_size_read(inode);
 672
 673         if (off > i_size)
 674                 return 0;
 675         if (off+len > i_size)
 676                 len = i_size-off;
 677         toread = len;
 678         while (toread > 0) {
 679                 tocopy = sb->s_blocksize - offset < toread ?
 680                                 sb->s_blocksize - offset : toread;
 681
 682                 tmp_bh.b_state = 0;
 683                 tmp_bh.b_size = 1 << inode->i_blkbits;
 684                 err = jfs_get_block(inode, blk, &tmp_bh, 0);
 685                 if (err)
 686                         return err;
 687                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
 688                         memset(data, 0, tocopy);
 689                 else {
 690                         bh = sb_bread(sb, tmp_bh.b_blocknr);
 691                         if (!bh)
 692                                 return -EIO;
 693                         memcpy(data, bh->b_data+offset, tocopy);
 694                         brelse(bh);
 695                 }
 696                 offset = 0;
 697                 toread -= tocopy;
 698                 data += tocopy;
 699                 blk++;
 700         }
 701         return len;
 702 }
 703
 704 /* Write to quotafile */
 705 static ssize_t jfs_quota_write(struct super_block *sb, int type,
 706                                const char *data, size_t len, loff_t off)
 707 {
 708         struct inode *inode = sb_dqopt(sb)->files[type];
 709         sector_t blk = off >> sb->s_blocksize_bits;
 710         int err = 0;
 711         int offset = off & (sb->s_blocksize - 1);
 712         int tocopy;
 713         size_t towrite = len;
 714         struct buffer_head tmp_bh;
 715         struct buffer_head *bh;
 716
 717         mutex_lock(&inode->i_mutex);
 718         while (towrite > 0) {
 719                 tocopy = sb->s_blocksize - offset < towrite ?
 720                                 sb->s_blocksize - offset : towrite;
 721
 722                 tmp_bh.b_state = 0;
 723                 tmp_bh.b_size = 1 << inode->i_blkbits;
 724                 err = jfs_get_block(inode, blk, &tmp_bh, 1);
 725                 if (err)
 726                         goto out;
 727                 if (offset || tocopy != sb->s_blocksize)
 728                         bh = sb_bread(sb, tmp_bh.b_blocknr);
 729                 else
 730                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
 731                 if (!bh) {
 732                         err = -EIO;
 733                         goto out;
 734                 }
 735                 lock_buffer(bh);
 736                 memcpy(bh->b_data+offset, data, tocopy);
 737                 flush_dcache_page(bh->b_page);
 738                 set_buffer_uptodate(bh);
 739                 mark_buffer_dirty(bh);
 740                 unlock_buffer(bh);
 741                 brelse(bh);
 742                 offset = 0;
 743                 towrite -= tocopy;
 744                 data += tocopy;
 745                 blk++;
 746         }
 747 out:
 748         if (len == towrite) {
 749                 mutex_unlock(&inode->i_mutex);
 750                 return err;
 751         }
 752         if (inode->i_size < off+len-towrite)
 753                 i_size_write(inode, off+len-towrite);
 754         inode->i_version++;
 755         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
 756         mark_inode_dirty(inode);
 757         mutex_unlock(&inode->i_mutex);
 758         return len - towrite;
 759 }
 760
 761 #endif
 762
 763 static const struct super_operations jfs_super_operations = {
 764         .alloc_inode    = jfs_alloc_inode,
 765         .destroy_inode  = jfs_destroy_inode,
 766         .dirty_inode    = jfs_dirty_inode,
 767         .write_inode    = jfs_write_inode,
 768         .evict_inode    = jfs_evict_inode,
 769         .put_super      = jfs_put_super,
 770         .sync_fs        = jfs_sync_fs,
 771         .freeze_fs      = jfs_freeze,
 772         .unfreeze_fs    = jfs_unfreeze,
 773         .statfs         = jfs_statfs,
 774         .remount_fs     = jfs_remount,
 775         .show_options   = jfs_show_options,
 776 #ifdef CONFIG_QUOTA
 777         .quota_read     = jfs_quota_read,
 778         .quota_write    = jfs_quota_write,
 779 #endif
 780 };
 781
 782 static const struct export_operations jfs_export_operations = {
 783         .fh_to_dentry   = jfs_fh_to_dentry,
 784         .fh_to_parent   = jfs_fh_to_parent,
 785         .get_parent     = jfs_get_parent,
 786 };
 787
 788 static struct file_system_type jfs_fs_type = {
 789         .owner          = THIS_MODULE,
 790         .name           = "jfs",
 791         .mount          = jfs_do_mount,
 792         .kill_sb        = kill_block_super,
 793         .fs_flags       = FS_REQUIRES_DEV,
 794 };
 795
 796 static void init_once(void *foo)
 797 {
 798         struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
 799
 800         memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
 801         INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
 802         init_rwsem(&jfs_ip->rdwrlock);
 803         mutex_init(&jfs_ip->commit_mutex);
 804         init_rwsem(&jfs_ip->xattr_sem);
 805         spin_lock_init(&jfs_ip->ag_lock);
 806         jfs_ip->active_ag = -1;
 807         inode_init_once(&jfs_ip->vfs_inode);
 808 }
 809
 810 static int __init init_jfs_fs(void)
 811 {
 812         int i;
 813         int rc;
 814
 815         jfs_inode_cachep =
 816             kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
 817                             SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
 818                             init_once);
 819         if (jfs_inode_cachep == NULL)
 820                 return -ENOMEM;
 821
 822         /*
 823          * Metapage initialization
 824          */
 825         rc = metapage_init();
 826         if (rc) {
 827                 jfs_err("metapage_init failed w/rc = %d", rc);
 828                 goto free_slab;
 829         }
 830
 831         /*
 832          * Transaction Manager initialization
 833          */
 834         rc = txInit();
 835         if (rc) {
 836                 jfs_err("txInit failed w/rc = %d", rc);
 837                 goto free_metapage;
 838         }
 839
 840         /*
 841          * I/O completion thread (endio)
 842          */
 843         jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
 844         if (IS_ERR(jfsIOthread)) {
 845                 rc = PTR_ERR(jfsIOthread);
 846                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
 847                 goto end_txmngr;
 848         }
 849
 850         if (commit_threads < 1)
 851                 commit_threads = num_online_cpus();
 852         if (commit_threads > MAX_COMMIT_THREADS)
 853                 commit_threads = MAX_COMMIT_THREADS;
 854
 855         for (i = 0; i < commit_threads; i++) {
 856                 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, "jfsCommit");
 857                 if (IS_ERR(jfsCommitThread[i])) {
 858                         rc = PTR_ERR(jfsCommitThread[i]);
 859                         jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
 860                         commit_threads = i;
 861                         goto kill_committask;
 862                 }
 863         }
 864
 865         jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
 866         if (IS_ERR(jfsSyncThread)) {
 867                 rc = PTR_ERR(jfsSyncThread);
 868                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
 869                 goto kill_committask;
 870         }
 871
 872 #ifdef PROC_FS_JFS
 873         jfs_proc_init();
 874 #endif
 875
 876         rc = register_filesystem(&jfs_fs_type);
 877         if (!rc)
 878                 return 0;
 879
 880 #ifdef PROC_FS_JFS
 881         jfs_proc_clean();
 882 #endif
 883         kthread_stop(jfsSyncThread);
 884 kill_committask:
 885         for (i = 0; i < commit_threads; i++)
 886                 kthread_stop(jfsCommitThread[i]);
 887         kthread_stop(jfsIOthread);
 888 end_txmngr:
 889         txExit();
 890 free_metapage:
 891         metapage_exit();
 892 free_slab:
 893         kmem_cache_destroy(jfs_inode_cachep);
 894         return rc;
 895 }
 896
 897 static void __exit exit_jfs_fs(void)
 898 {
 899         int i;
 900
 901         jfs_info("exit_jfs_fs called");
 902
 903         txExit();
 904         metapage_exit();
 905
 906         kthread_stop(jfsIOthread);
 907         for (i = 0; i < commit_threads; i++)
 908                 kthread_stop(jfsCommitThread[i]);
 909         kthread_stop(jfsSyncThread);
 910 #ifdef PROC_FS_JFS
 911         jfs_proc_clean();
 912 #endif
 913         unregister_filesystem(&jfs_fs_type);
 914
 915         /*
 916          * Make sure all delayed rcu free inodes are flushed before we
 917          * destroy cache.
 918          */
 919         rcu_barrier();
 920         kmem_cache_destroy(jfs_inode_cachep);
 921 }
 922
 923 module_init(init_jfs_fs)
 924 module_exit(exit_jfs_fs)