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