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 void jfs_clear_inode(struct inode *inode)
 136 {
 137         dquot_drop(inode);
 138 }
 139
 140 static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 141 {
 142         struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb);
 143         s64 maxinodes;
 144         struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
 145
 146         jfs_info("In jfs_statfs");
 147         buf->f_type = JFS_SUPER_MAGIC;
 148         buf->f_bsize = sbi->bsize;
 149         buf->f_blocks = sbi->bmap->db_mapsize;
 150         buf->f_bfree = sbi->bmap->db_nfree;
 151         buf->f_bavail = sbi->bmap->db_nfree;
 152         /*
 153          * If we really return the number of allocated & free inodes, some
 154          * applications will fail because they won't see enough free inodes.
 155          * We'll try to calculate some guess as to how may inodes we can
 156          * really allocate
 157          *
 158          * buf->f_files = atomic_read(&imap->im_numinos);
 159          * buf->f_ffree = atomic_read(&imap->im_numfree);
 160          */
 161         maxinodes = min((s64) atomic_read(&imap->im_numinos) +
 162                         ((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
 163                          << L2INOSPEREXT), (s64) 0xffffffffLL);
 164         buf->f_files = maxinodes;
 165         buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
 166                                     atomic_read(&imap->im_numfree));
 167         buf->f_fsid.val[0] = (u32)crc32_le(0, sbi->uuid, sizeof(sbi->uuid)/2);
 168         buf->f_fsid.val[1] = (u32)crc32_le(0, sbi->uuid + sizeof(sbi->uuid)/2,
 169                                         sizeof(sbi->uuid)/2);
 170
 171         buf->f_namelen = JFS_NAME_MAX;
 172         return 0;
 173 }
 174
 175 static void jfs_put_super(struct super_block *sb)
 176 {
 177         struct jfs_sb_info *sbi = JFS_SBI(sb);
 178         int rc;
 179
 180         jfs_info("In jfs_put_super");
 181
 182         dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
 183
 184         lock_kernel();
 185
 186         rc = jfs_umount(sb);
 187         if (rc)
 188                 jfs_err("jfs_umount failed with return code %d", rc);
 189
 190         unload_nls(sbi->nls_tab);
 191
 192         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
 193         iput(sbi->direct_inode);
 194
 195         kfree(sbi);
 196
 197         unlock_kernel();
 198 }
 199
 200 enum {
 201         Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
 202         Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota,
 203         Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask
 204 };
 205
 206 static const match_table_t tokens = {
 207         {Opt_integrity, "integrity"},
 208         {Opt_nointegrity, "nointegrity"},
 209         {Opt_iocharset, "iocharset=%s"},
 210         {Opt_resize, "resize=%u"},
 211         {Opt_resize_nosize, "resize"},
 212         {Opt_errors, "errors=%s"},
 213         {Opt_ignore, "noquota"},
 214         {Opt_ignore, "quota"},
 215         {Opt_usrquota, "usrquota"},
 216         {Opt_grpquota, "grpquota"},
 217         {Opt_uid, "uid=%u"},
 218         {Opt_gid, "gid=%u"},
 219         {Opt_umask, "umask=%u"},
 220         {Opt_err, NULL}
 221 };
 222
 223 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
 224                          int *flag)
 225 {
 226         void *nls_map = (void *)-1;     /* -1: no change;  NULL: none */
 227         char *p;
 228         struct jfs_sb_info *sbi = JFS_SBI(sb);
 229
 230         *newLVSize = 0;
 231
 232         if (!options)
 233                 return 1;
 234
 235         while ((p = strsep(&options, ",")) != NULL) {
 236                 substring_t args[MAX_OPT_ARGS];
 237                 int token;
 238                 if (!*p)
 239                         continue;
 240
 241                 token = match_token(p, tokens, args);
 242                 switch (token) {
 243                 case Opt_integrity:
 244                         *flag &= ~JFS_NOINTEGRITY;
 245                         break;
 246                 case Opt_nointegrity:
 247                         *flag |= JFS_NOINTEGRITY;
 248                         break;
 249                 case Opt_ignore:
 250                         /* Silently ignore the quota options */
 251                         /* Don't do anything ;-) */
 252                         break;
 253                 case Opt_iocharset:
 254                         if (nls_map && nls_map != (void *) -1)
 255                                 unload_nls(nls_map);
 256                         if (!strcmp(args[0].from, "none"))
 257                                 nls_map = NULL;
 258                         else {
 259                                 nls_map = load_nls(args[0].from);
 260                                 if (!nls_map) {
 261                                         printk(KERN_ERR
 262                                                "JFS: charset not found\n");
 263                                         goto cleanup;
 264                                 }
 265                         }
 266                         break;
 267                 case Opt_resize:
 268                 {
 269                         char *resize = args[0].from;
 270                         *newLVSize = simple_strtoull(resize, &resize, 0);
 271                         break;
 272                 }
 273                 case Opt_resize_nosize:
 274                 {
 275                         *newLVSize = sb->s_bdev->bd_inode->i_size >>
 276                                 sb->s_blocksize_bits;
 277                         if (*newLVSize == 0)
 278                                 printk(KERN_ERR
 279                                        "JFS: Cannot determine volume size\n");
 280                         break;
 281                 }
 282                 case Opt_errors:
 283                 {
 284                         char *errors = args[0].from;
 285                         if (!errors || !*errors)
 286                                 goto cleanup;
 287                         if (!strcmp(errors, "continue")) {
 288                                 *flag &= ~JFS_ERR_REMOUNT_RO;
 289                                 *flag &= ~JFS_ERR_PANIC;
 290                                 *flag |= JFS_ERR_CONTINUE;
 291                         } else if (!strcmp(errors, "remount-ro")) {
 292                                 *flag &= ~JFS_ERR_CONTINUE;
 293                                 *flag &= ~JFS_ERR_PANIC;
 294                                 *flag |= JFS_ERR_REMOUNT_RO;
 295                         } else if (!strcmp(errors, "panic")) {
 296                                 *flag &= ~JFS_ERR_CONTINUE;
 297                                 *flag &= ~JFS_ERR_REMOUNT_RO;
 298                                 *flag |= JFS_ERR_PANIC;
 299                         } else {
 300                                 printk(KERN_ERR
 301                                        "JFS: %s is an invalid error handler\n",
 302                                        errors);
 303                                 goto cleanup;
 304                         }
 305                         break;
 306                 }
 307
 308 #ifdef CONFIG_QUOTA
 309                 case Opt_quota:
 310                 case Opt_usrquota:
 311                         *flag |= JFS_USRQUOTA;
 312                         break;
 313                 case Opt_grpquota:
 314                         *flag |= JFS_GRPQUOTA;
 315                         break;
 316 #else
 317                 case Opt_usrquota:
 318                 case Opt_grpquota:
 319                 case Opt_quota:
 320                         printk(KERN_ERR
 321                                "JFS: quota operations not supported\n");
 322                         break;
 323 #endif
 324                 case Opt_uid:
 325                 {
 326                         char *uid = args[0].from;
 327                         sbi->uid = simple_strtoul(uid, &uid, 0);
 328                         break;
 329                 }
 330                 case Opt_gid:
 331                 {
 332                         char *gid = args[0].from;
 333                         sbi->gid = simple_strtoul(gid, &gid, 0);
 334                         break;
 335                 }
 336                 case Opt_umask:
 337                 {
 338                         char *umask = args[0].from;
 339                         sbi->umask = simple_strtoul(umask, &umask, 8);
 340                         if (sbi->umask & ~0777) {
 341                                 printk(KERN_ERR
 342                                        "JFS: Invalid value of umask\n");
 343                                 goto cleanup;
 344                         }
 345                         break;
 346                 }
 347                 default:
 348                         printk("jfs: Unrecognized mount option \"%s\" "
 349                                         " or missing value\n", p);
 350                         goto cleanup;
 351                 }
 352         }
 353
 354         if (nls_map != (void *) -1) {
 355                 /* Discard old (if remount) */
 356                 unload_nls(sbi->nls_tab);
 357                 sbi->nls_tab = nls_map;
 358         }
 359         return 1;
 360
 361 cleanup:
 362         if (nls_map && nls_map != (void *) -1)
 363                 unload_nls(nls_map);
 364         return 0;
 365 }
 366
 367 static int jfs_remount(struct super_block *sb, int *flags, char *data)
 368 {
 369         s64 newLVSize = 0;
 370         int rc = 0;
 371         int flag = JFS_SBI(sb)->flag;
 372         int ret;
 373
 374         if (!parse_options(data, sb, &newLVSize, &flag)) {
 375                 return -EINVAL;
 376         }
 377         lock_kernel();
 378         if (newLVSize) {
 379                 if (sb->s_flags & MS_RDONLY) {
 380                         printk(KERN_ERR
 381                   "JFS: resize requires volume to be mounted read-write\n");
 382                         unlock_kernel();
 383                         return -EROFS;
 384                 }
 385                 rc = jfs_extendfs(sb, newLVSize, 0);
 386                 if (rc) {
 387                         unlock_kernel();
 388                         return rc;
 389                 }
 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                 unlock_kernel();
 406                 dquot_resume(sb, -1);
 407                 return ret;
 408         }
 409         if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
 410                 rc = dquot_suspend(sb, -1);
 411                 if (rc < 0) {
 412                         unlock_kernel();
 413                         return rc;
 414                 }
 415                 rc = jfs_umount_rw(sb);
 416                 JFS_SBI(sb)->flag = flag;
 417                 unlock_kernel();
 418                 return rc;
 419         }
 420         if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
 421                 if (!(sb->s_flags & MS_RDONLY)) {
 422                         rc = jfs_umount_rw(sb);
 423                         if (rc) {
 424                                 unlock_kernel();
 425                                 return rc;
 426                         }
 427                         JFS_SBI(sb)->flag = flag;
 428                         ret = jfs_mount_rw(sb, 1);
 429                         unlock_kernel();
 430                         return ret;
 431                 }
 432         JFS_SBI(sb)->flag = flag;
 433
 434         unlock_kernel();
 435         return 0;
 436 }
 437
 438 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
 439 {
 440         struct jfs_sb_info *sbi;
 441         struct inode *inode;
 442         int rc;
 443         s64 newLVSize = 0;
 444         int flag, ret = -EINVAL;
 445
 446         jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
 447
 448         if (!new_valid_dev(sb->s_bdev->bd_dev))
 449                 return -EOVERFLOW;
 450
 451         sbi = kzalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
 452         if (!sbi)
 453                 return -ENOMEM;
 454         sb->s_fs_info = sbi;
 455         sbi->sb = sb;
 456         sbi->uid = sbi->gid = sbi->umask = -1;
 457
 458         /* initialize the mount flag and determine the default error handler */
 459         flag = JFS_ERR_REMOUNT_RO;
 460
 461         if (!parse_options((char *) data, sb, &newLVSize, &flag))
 462                 goto out_kfree;
 463         sbi->flag = flag;
 464
 465 #ifdef CONFIG_JFS_POSIX_ACL
 466         sb->s_flags |= MS_POSIXACL;
 467 #endif
 468
 469         if (newLVSize) {
 470                 printk(KERN_ERR "resize option for remount only\n");
 471                 goto out_kfree;
 472         }
 473
 474         /*
 475          * Initialize blocksize to 4K.
 476          */
 477         sb_set_blocksize(sb, PSIZE);
 478
 479         /*
 480          * Set method vectors.
 481          */
 482         sb->s_op = &jfs_super_operations;
 483         sb->s_export_op = &jfs_export_operations;
 484
 485         /*
 486          * Initialize direct-mapping inode/address-space
 487          */
 488         inode = new_inode(sb);
 489         if (inode == NULL) {
 490                 ret = -ENOMEM;
 491                 goto out_unload;
 492         }
 493         inode->i_ino = 0;
 494         inode->i_nlink = 1;
 495         inode->i_size = sb->s_bdev->bd_inode->i_size;
 496         inode->i_mapping->a_ops = &jfs_metapage_aops;
 497         insert_inode_hash(inode);
 498         mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
 499
 500         sbi->direct_inode = inode;
 501
 502         rc = jfs_mount(sb);
 503         if (rc) {
 504                 if (!silent) {
 505                         jfs_err("jfs_mount failed w/return code = %d", rc);
 506                 }
 507                 goto out_mount_failed;
 508         }
 509         if (sb->s_flags & MS_RDONLY)
 510                 sbi->log = NULL;
 511         else {
 512                 rc = jfs_mount_rw(sb, 0);
 513                 if (rc) {
 514                         if (!silent) {
 515                                 jfs_err("jfs_mount_rw failed, return code = %d",
 516                                         rc);
 517                         }
 518                         goto out_no_rw;
 519                 }
 520         }
 521
 522         sb->s_magic = JFS_SUPER_MAGIC;
 523
 524         inode = jfs_iget(sb, ROOT_I);
 525         if (IS_ERR(inode)) {
 526                 ret = PTR_ERR(inode);
 527                 goto out_no_rw;
 528         }
 529         sb->s_root = d_alloc_root(inode);
 530         if (!sb->s_root)
 531                 goto out_no_root;
 532
 533         if (sbi->mntflag & JFS_OS2)
 534                 sb->s_root->d_op = &jfs_ci_dentry_operations;
 535
 536         /* logical blocks are represented by 40 bits in pxd_t, etc. */
 537         sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
 538 #if BITS_PER_LONG == 32
 539         /*
 540          * Page cache is indexed by long.
 541          * I would use MAX_LFS_FILESIZE, but it's only half as big
 542          */
 543         sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, (u64)sb->s_maxbytes);
 544 #endif
 545         sb->s_time_gran = 1;
 546         return 0;
 547
 548 out_no_root:
 549         jfs_err("jfs_read_super: get root dentry failed");
 550         iput(inode);
 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 int jfs_get_sb(struct file_system_type *fs_type,
 601         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 602 {
 603         return get_sb_bdev(fs_type, flags, dev_name, data, jfs_fill_super,
 604                            mnt);
 605 }
 606
 607 static int jfs_sync_fs(struct super_block *sb, int wait)
 608 {
 609         struct jfs_log *log = JFS_SBI(sb)->log;
 610
 611         /* log == NULL indicates read-only mount */
 612         if (log) {
 613                 jfs_flush_journal(log, wait);
 614                 jfs_syncpt(log, 0);
 615         }
 616
 617         return 0;
 618 }
 619
 620 static int jfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
 621 {
 622         struct jfs_sb_info *sbi = JFS_SBI(vfs->mnt_sb);
 623
 624         if (sbi->uid != -1)
 625                 seq_printf(seq, ",uid=%d", sbi->uid);
 626         if (sbi->gid != -1)
 627                 seq_printf(seq, ",gid=%d", sbi->gid);
 628         if (sbi->umask != -1)
 629                 seq_printf(seq, ",umask=%03o", sbi->umask);
 630         if (sbi->flag & JFS_NOINTEGRITY)
 631                 seq_puts(seq, ",nointegrity");
 632         if (sbi->nls_tab)
 633                 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset);
 634         if (sbi->flag & JFS_ERR_CONTINUE)
 635                 seq_printf(seq, ",errors=continue");
 636         if (sbi->flag & JFS_ERR_PANIC)
 637                 seq_printf(seq, ",errors=panic");
 638
 639 #ifdef CONFIG_QUOTA
 640         if (sbi->flag & JFS_USRQUOTA)
 641                 seq_puts(seq, ",usrquota");
 642
 643         if (sbi->flag & JFS_GRPQUOTA)
 644                 seq_puts(seq, ",grpquota");
 645 #endif
 646
 647         return 0;
 648 }
 649
 650 #ifdef CONFIG_QUOTA
 651
 652 /* Read data from quotafile - avoid pagecache and such because we cannot afford
 653  * acquiring the locks... As quota files are never truncated and quota code
 654  * itself serializes the operations (and noone else should touch the files)
 655  * we don't have to be afraid of races */
 656 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
 657                               size_t len, loff_t off)
 658 {
 659         struct inode *inode = sb_dqopt(sb)->files[type];
 660         sector_t blk = off >> sb->s_blocksize_bits;
 661         int err = 0;
 662         int offset = off & (sb->s_blocksize - 1);
 663         int tocopy;
 664         size_t toread;
 665         struct buffer_head tmp_bh;
 666         struct buffer_head *bh;
 667         loff_t i_size = i_size_read(inode);
 668
 669         if (off > i_size)
 670                 return 0;
 671         if (off+len > i_size)
 672                 len = i_size-off;
 673         toread = len;
 674         while (toread > 0) {
 675                 tocopy = sb->s_blocksize - offset < toread ?
 676                                 sb->s_blocksize - offset : toread;
 677
 678                 tmp_bh.b_state = 0;
 679                 tmp_bh.b_size = 1 << inode->i_blkbits;
 680                 err = jfs_get_block(inode, blk, &tmp_bh, 0);
 681                 if (err)
 682                         return err;
 683                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
 684                         memset(data, 0, tocopy);
 685                 else {
 686                         bh = sb_bread(sb, tmp_bh.b_blocknr);
 687                         if (!bh)
 688                                 return -EIO;
 689                         memcpy(data, bh->b_data+offset, tocopy);
 690                         brelse(bh);
 691                 }
 692                 offset = 0;
 693                 toread -= tocopy;
 694                 data += tocopy;
 695                 blk++;
 696         }
 697         return len;
 698 }
 699
 700 /* Write to quotafile */
 701 static ssize_t jfs_quota_write(struct super_block *sb, int type,
 702                                const char *data, size_t len, loff_t off)
 703 {
 704         struct inode *inode = sb_dqopt(sb)->files[type];
 705         sector_t blk = off >> sb->s_blocksize_bits;
 706         int err = 0;
 707         int offset = off & (sb->s_blocksize - 1);
 708         int tocopy;
 709         size_t towrite = len;
 710         struct buffer_head tmp_bh;
 711         struct buffer_head *bh;
 712
 713         mutex_lock(&inode->i_mutex);
 714         while (towrite > 0) {
 715                 tocopy = sb->s_blocksize - offset < towrite ?
 716                                 sb->s_blocksize - offset : towrite;
 717
 718                 tmp_bh.b_state = 0;
 719                 tmp_bh.b_size = 1 << inode->i_blkbits;
 720                 err = jfs_get_block(inode, blk, &tmp_bh, 1);
 721                 if (err)
 722                         goto out;
 723                 if (offset || tocopy != sb->s_blocksize)
 724                         bh = sb_bread(sb, tmp_bh.b_blocknr);
 725                 else
 726                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
 727                 if (!bh) {
 728                         err = -EIO;
 729                         goto out;
 730                 }
 731                 lock_buffer(bh);
 732                 memcpy(bh->b_data+offset, data, tocopy);
 733                 flush_dcache_page(bh->b_page);
 734                 set_buffer_uptodate(bh);
 735                 mark_buffer_dirty(bh);
 736                 unlock_buffer(bh);
 737                 brelse(bh);
 738                 offset = 0;
 739                 towrite -= tocopy;
 740                 data += tocopy;
 741                 blk++;
 742         }
 743 out:
 744         if (len == towrite) {
 745                 mutex_unlock(&inode->i_mutex);
 746                 return err;
 747         }
 748         if (inode->i_size < off+len-towrite)
 749                 i_size_write(inode, off+len-towrite);
 750         inode->i_version++;
 751         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
 752         mark_inode_dirty(inode);
 753         mutex_unlock(&inode->i_mutex);
 754         return len - towrite;
 755 }
 756
 757 #endif
 758
 759 static const struct super_operations jfs_super_operations = {
 760         .alloc_inode    = jfs_alloc_inode,
 761         .destroy_inode  = jfs_destroy_inode,
 762         .dirty_inode    = jfs_dirty_inode,
 763         .write_inode    = jfs_write_inode,
 764         .delete_inode   = jfs_delete_inode,
 765         .clear_inode    = jfs_clear_inode,
 766         .put_super      = jfs_put_super,
 767         .sync_fs        = jfs_sync_fs,
 768         .freeze_fs      = jfs_freeze,
 769         .unfreeze_fs    = jfs_unfreeze,
 770         .statfs         = jfs_statfs,
 771         .remount_fs     = jfs_remount,
 772         .show_options   = jfs_show_options,
 773 #ifdef CONFIG_QUOTA
 774         .quota_read     = jfs_quota_read,
 775         .quota_write    = jfs_quota_write,
 776 #endif
 777 };
 778
 779 static const struct export_operations jfs_export_operations = {
 780         .fh_to_dentry   = jfs_fh_to_dentry,
 781         .fh_to_parent   = jfs_fh_to_parent,
 782         .get_parent     = jfs_get_parent,
 783 };
 784
 785 static struct file_system_type jfs_fs_type = {
 786         .owner          = THIS_MODULE,
 787         .name           = "jfs",
 788         .get_sb         = jfs_get_sb,
 789         .kill_sb        = kill_block_super,
 790         .fs_flags       = FS_REQUIRES_DEV,
 791 };
 792
 793 static void init_once(void *foo)
 794 {
 795         struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
 796
 797         memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
 798         INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
 799         init_rwsem(&jfs_ip->rdwrlock);
 800         mutex_init(&jfs_ip->commit_mutex);
 801         init_rwsem(&jfs_ip->xattr_sem);
 802         spin_lock_init(&jfs_ip->ag_lock);
 803         jfs_ip->active_ag = -1;
 804         inode_init_once(&jfs_ip->vfs_inode);
 805 }
 806
 807 static int __init init_jfs_fs(void)
 808 {
 809         int i;
 810         int rc;
 811
 812         jfs_inode_cachep =
 813             kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
 814                             SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
 815                             init_once);
 816         if (jfs_inode_cachep == NULL)
 817                 return -ENOMEM;
 818
 819         /*
 820          * Metapage initialization
 821          */
 822         rc = metapage_init();
 823         if (rc) {
 824                 jfs_err("metapage_init failed w/rc = %d", rc);
 825                 goto free_slab;
 826         }
 827
 828         /*
 829          * Transaction Manager initialization
 830          */
 831         rc = txInit();
 832         if (rc) {
 833                 jfs_err("txInit failed w/rc = %d", rc);
 834                 goto free_metapage;
 835         }
 836
 837         /*
 838          * I/O completion thread (endio)
 839          */
 840         jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
 841         if (IS_ERR(jfsIOthread)) {
 842                 rc = PTR_ERR(jfsIOthread);
 843                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
 844                 goto end_txmngr;
 845         }
 846
 847         if (commit_threads < 1)
 848                 commit_threads = num_online_cpus();
 849         if (commit_threads > MAX_COMMIT_THREADS)
 850                 commit_threads = MAX_COMMIT_THREADS;
 851
 852         for (i = 0; i < commit_threads; i++) {
 853                 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, "jfsCommit");
 854                 if (IS_ERR(jfsCommitThread[i])) {
 855                         rc = PTR_ERR(jfsCommitThread[i]);
 856                         jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
 857                         commit_threads = i;
 858                         goto kill_committask;
 859                 }
 860         }
 861
 862         jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
 863         if (IS_ERR(jfsSyncThread)) {
 864                 rc = PTR_ERR(jfsSyncThread);
 865                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
 866                 goto kill_committask;
 867         }
 868
 869 #ifdef PROC_FS_JFS
 870         jfs_proc_init();
 871 #endif
 872
 873         return register_filesystem(&jfs_fs_type);
 874
 875 kill_committask:
 876         for (i = 0; i < commit_threads; i++)
 877                 kthread_stop(jfsCommitThread[i]);
 878         kthread_stop(jfsIOthread);
 879 end_txmngr:
 880         txExit();
 881 free_metapage:
 882         metapage_exit();
 883 free_slab:
 884         kmem_cache_destroy(jfs_inode_cachep);
 885         return rc;
 886 }
 887
 888 static void __exit exit_jfs_fs(void)
 889 {
 890         int i;
 891
 892         jfs_info("exit_jfs_fs called");
 893
 894         txExit();
 895         metapage_exit();
 896
 897         kthread_stop(jfsIOthread);
 898         for (i = 0; i < commit_threads; i++)
 899                 kthread_stop(jfsCommitThread[i]);
 900         kthread_stop(jfsSyncThread);
 901 #ifdef PROC_FS_JFS
 902         jfs_proc_clean();
 903 #endif
 904         unregister_filesystem(&jfs_fs_type);
 905         kmem_cache_destroy(jfs_inode_cachep);
 906 }
 907
 908 module_init(init_jfs_fs)
 909 module_exit(exit_jfs_fs)