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 <asm/uaccess.h>
  34 #include <linux/seq_file.h>
  35 #include <linux/smp_lock.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_destroy_inode(struct inode *inode)
 119 {
 120         struct jfs_inode_info *ji = JFS_IP(inode);
 121
 122         BUG_ON(!list_empty(&ji->anon_inode_list));
 123
 124         spin_lock_irq(&ji->ag_lock);
 125         if (ji->active_ag != -1) {
 126                 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
 127                 atomic_dec(&bmap->db_active[ji->active_ag]);
 128                 ji->active_ag = -1;
 129         }
 130         spin_unlock_irq(&ji->ag_lock);
 131
 132 #ifdef CONFIG_JFS_POSIX_ACL
 133         if (ji->i_acl != JFS_ACL_NOT_CACHED) {
 134                 posix_acl_release(ji->i_acl);
 135                 ji->i_acl = JFS_ACL_NOT_CACHED;
 136         }
 137         if (ji->i_default_acl != JFS_ACL_NOT_CACHED) {
 138                 posix_acl_release(ji->i_default_acl);
 139                 ji->i_default_acl = JFS_ACL_NOT_CACHED;
 140         }
 141 #endif
 142
 143         kmem_cache_free(jfs_inode_cachep, ji);
 144 }
 145
 146 static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 147 {
 148         struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb);
 149         s64 maxinodes;
 150         struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
 151
 152         jfs_info("In jfs_statfs");
 153         buf->f_type = JFS_SUPER_MAGIC;
 154         buf->f_bsize = sbi->bsize;
 155         buf->f_blocks = sbi->bmap->db_mapsize;
 156         buf->f_bfree = sbi->bmap->db_nfree;
 157         buf->f_bavail = sbi->bmap->db_nfree;
 158         /*
 159          * If we really return the number of allocated & free inodes, some
 160          * applications will fail because they won't see enough free inodes.
 161          * We'll try to calculate some guess as to how may inodes we can
 162          * really allocate
 163          *
 164          * buf->f_files = atomic_read(&imap->im_numinos);
 165          * buf->f_ffree = atomic_read(&imap->im_numfree);
 166          */
 167         maxinodes = min((s64) atomic_read(&imap->im_numinos) +
 168                         ((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
 169                          << L2INOSPEREXT), (s64) 0xffffffffLL);
 170         buf->f_files = maxinodes;
 171         buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
 172                                     atomic_read(&imap->im_numfree));
 173         buf->f_fsid.val[0] = (u32)crc32_le(0, sbi->uuid, sizeof(sbi->uuid)/2);
 174         buf->f_fsid.val[1] = (u32)crc32_le(0, sbi->uuid + sizeof(sbi->uuid)/2,
 175                                         sizeof(sbi->uuid)/2);
 176
 177         buf->f_namelen = JFS_NAME_MAX;
 178         return 0;
 179 }
 180
 181 static void jfs_put_super(struct super_block *sb)
 182 {
 183         struct jfs_sb_info *sbi = JFS_SBI(sb);
 184         int rc;
 185
 186         jfs_info("In jfs_put_super");
 187
 188         lock_kernel();
 189
 190         rc = jfs_umount(sb);
 191         if (rc)
 192                 jfs_err("jfs_umount failed with return code %d", rc);
 193         if (sbi->nls_tab)
 194                 unload_nls(sbi->nls_tab);
 195         sbi->nls_tab = NULL;
 196
 197         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
 198         iput(sbi->direct_inode);
 199         sbi->direct_inode = NULL;
 200
 201         kfree(sbi);
 202
 203         unlock_kernel();
 204 }
 205
 206 enum {
 207         Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
 208         Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota,
 209         Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask
 210 };
 211
 212 static const match_table_t tokens = {
 213         {Opt_integrity, "integrity"},
 214         {Opt_nointegrity, "nointegrity"},
 215         {Opt_iocharset, "iocharset=%s"},
 216         {Opt_resize, "resize=%u"},
 217         {Opt_resize_nosize, "resize"},
 218         {Opt_errors, "errors=%s"},
 219         {Opt_ignore, "noquota"},
 220         {Opt_ignore, "quota"},
 221         {Opt_usrquota, "usrquota"},
 222         {Opt_grpquota, "grpquota"},
 223         {Opt_uid, "uid=%u"},
 224         {Opt_gid, "gid=%u"},
 225         {Opt_umask, "umask=%u"},
 226         {Opt_err, NULL}
 227 };
 228
 229 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
 230                          int *flag)
 231 {
 232         void *nls_map = (void *)-1;     /* -1: no change;  NULL: none */
 233         char *p;
 234         struct jfs_sb_info *sbi = JFS_SBI(sb);
 235
 236         *newLVSize = 0;
 237
 238         if (!options)
 239                 return 1;
 240
 241         while ((p = strsep(&options, ",")) != NULL) {
 242                 substring_t args[MAX_OPT_ARGS];
 243                 int token;
 244                 if (!*p)
 245                         continue;
 246
 247                 token = match_token(p, tokens, args);
 248                 switch (token) {
 249                 case Opt_integrity:
 250                         *flag &= ~JFS_NOINTEGRITY;
 251                         break;
 252                 case Opt_nointegrity:
 253                         *flag |= JFS_NOINTEGRITY;
 254                         break;
 255                 case Opt_ignore:
 256                         /* Silently ignore the quota options */
 257                         /* Don't do anything ;-) */
 258                         break;
 259                 case Opt_iocharset:
 260                         if (nls_map && nls_map != (void *) -1)
 261                                 unload_nls(nls_map);
 262                         if (!strcmp(args[0].from, "none"))
 263                                 nls_map = NULL;
 264                         else {
 265                                 nls_map = load_nls(args[0].from);
 266                                 if (!nls_map) {
 267                                         printk(KERN_ERR
 268                                                "JFS: charset not found\n");
 269                                         goto cleanup;
 270                                 }
 271                         }
 272                         break;
 273                 case Opt_resize:
 274                 {
 275                         char *resize = args[0].from;
 276                         *newLVSize = simple_strtoull(resize, &resize, 0);
 277                         break;
 278                 }
 279                 case Opt_resize_nosize:
 280                 {
 281                         *newLVSize = sb->s_bdev->bd_inode->i_size >>
 282                                 sb->s_blocksize_bits;
 283                         if (*newLVSize == 0)
 284                                 printk(KERN_ERR
 285                                        "JFS: Cannot determine volume size\n");
 286                         break;
 287                 }
 288                 case Opt_errors:
 289                 {
 290                         char *errors = args[0].from;
 291                         if (!errors || !*errors)
 292                                 goto cleanup;
 293                         if (!strcmp(errors, "continue")) {
 294                                 *flag &= ~JFS_ERR_REMOUNT_RO;
 295                                 *flag &= ~JFS_ERR_PANIC;
 296                                 *flag |= JFS_ERR_CONTINUE;
 297                         } else if (!strcmp(errors, "remount-ro")) {
 298                                 *flag &= ~JFS_ERR_CONTINUE;
 299                                 *flag &= ~JFS_ERR_PANIC;
 300                                 *flag |= JFS_ERR_REMOUNT_RO;
 301                         } else if (!strcmp(errors, "panic")) {
 302                                 *flag &= ~JFS_ERR_CONTINUE;
 303                                 *flag &= ~JFS_ERR_REMOUNT_RO;
 304                                 *flag |= JFS_ERR_PANIC;
 305                         } else {
 306                                 printk(KERN_ERR
 307                                        "JFS: %s is an invalid error handler\n",
 308                                        errors);
 309                                 goto cleanup;
 310                         }
 311                         break;
 312                 }
 313
 314 #ifdef CONFIG_QUOTA
 315                 case Opt_quota:
 316                 case Opt_usrquota:
 317                         *flag |= JFS_USRQUOTA;
 318                         break;
 319                 case Opt_grpquota:
 320                         *flag |= JFS_GRPQUOTA;
 321                         break;
 322 #else
 323                 case Opt_usrquota:
 324                 case Opt_grpquota:
 325                 case Opt_quota:
 326                         printk(KERN_ERR
 327                                "JFS: quota operations not supported\n");
 328                         break;
 329 #endif
 330                 case Opt_uid:
 331                 {
 332                         char *uid = args[0].from;
 333                         sbi->uid = simple_strtoul(uid, &uid, 0);
 334                         break;
 335                 }
 336                 case Opt_gid:
 337                 {
 338                         char *gid = args[0].from;
 339                         sbi->gid = simple_strtoul(gid, &gid, 0);
 340                         break;
 341                 }
 342                 case Opt_umask:
 343                 {
 344                         char *umask = args[0].from;
 345                         sbi->umask = simple_strtoul(umask, &umask, 8);
 346                         if (sbi->umask & ~0777) {
 347                                 printk(KERN_ERR
 348                                        "JFS: Invalid value of umask\n");
 349                                 goto cleanup;
 350                         }
 351                         break;
 352                 }
 353                 default:
 354                         printk("jfs: Unrecognized mount option \"%s\" "
 355                                         " or missing value\n", p);
 356                         goto cleanup;
 357                 }
 358         }
 359
 360         if (nls_map != (void *) -1) {
 361                 /* Discard old (if remount) */
 362                 if (sbi->nls_tab)
 363                         unload_nls(sbi->nls_tab);
 364                 sbi->nls_tab = nls_map;
 365         }
 366         return 1;
 367
 368 cleanup:
 369         if (nls_map && nls_map != (void *) -1)
 370                 unload_nls(nls_map);
 371         return 0;
 372 }
 373
 374 static int jfs_remount(struct super_block *sb, int *flags, char *data)
 375 {
 376         s64 newLVSize = 0;
 377         int rc = 0;
 378         int flag = JFS_SBI(sb)->flag;
 379         int ret;
 380
 381         if (!parse_options(data, sb, &newLVSize, &flag)) {
 382                 return -EINVAL;
 383         }
 384         lock_kernel();
 385         if (newLVSize) {
 386                 if (sb->s_flags & MS_RDONLY) {
 387                         printk(KERN_ERR
 388                   "JFS: resize requires volume to be mounted read-write\n");
 389                         unlock_kernel();
 390                         return -EROFS;
 391                 }
 392                 rc = jfs_extendfs(sb, newLVSize, 0);
 393                 if (rc) {
 394                         unlock_kernel();
 395                         return rc;
 396                 }
 397         }
 398
 399         if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
 400                 /*
 401                  * Invalidate any previously read metadata.  fsck may have
 402                  * changed the on-disk data since we mounted r/o
 403                  */
 404                 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
 405
 406                 JFS_SBI(sb)->flag = flag;
 407                 ret = jfs_mount_rw(sb, 1);
 408                 unlock_kernel();
 409                 return ret;
 410         }
 411         if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
 412                 rc = jfs_umount_rw(sb);
 413                 JFS_SBI(sb)->flag = flag;
 414                 unlock_kernel();
 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                                 unlock_kernel();
 422                                 return rc;
 423                         }
 424                         JFS_SBI(sb)->flag = flag;
 425                         ret = jfs_mount_rw(sb, 1);
 426                         unlock_kernel();
 427                         return ret;
 428                 }
 429         JFS_SBI(sb)->flag = flag;
 430
 431         unlock_kernel();
 432         return 0;
 433 }
 434
 435 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
 436 {
 437         struct jfs_sb_info *sbi;
 438         struct inode *inode;
 439         int rc;
 440         s64 newLVSize = 0;
 441         int flag, ret = -EINVAL;
 442
 443         jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
 444
 445         if (!new_valid_dev(sb->s_bdev->bd_dev))
 446                 return -EOVERFLOW;
 447
 448         sbi = kzalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
 449         if (!sbi)
 450                 return -ENOMEM;
 451         sb->s_fs_info = sbi;
 452         sbi->sb = sb;
 453         sbi->uid = sbi->gid = sbi->umask = -1;
 454
 455         /* initialize the mount flag and determine the default error handler */
 456         flag = JFS_ERR_REMOUNT_RO;
 457
 458         if (!parse_options((char *) data, sb, &newLVSize, &flag)) {
 459                 kfree(sbi);
 460                 return -EINVAL;
 461         }
 462         sbi->flag = flag;
 463
 464 #ifdef CONFIG_JFS_POSIX_ACL
 465         sb->s_flags |= MS_POSIXACL;
 466 #endif
 467
 468         if (newLVSize) {
 469                 printk(KERN_ERR "resize option for remount only\n");
 470                 return -EINVAL;
 471         }
 472
 473         /*
 474          * Initialize blocksize to 4K.
 475          */
 476         sb_set_blocksize(sb, PSIZE);
 477
 478         /*
 479          * Set method vectors.
 480          */
 481         sb->s_op = &jfs_super_operations;
 482         sb->s_export_op = &jfs_export_operations;
 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_kfree;
 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, 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_kfree:
 563         if (sbi->nls_tab)
 564                 unload_nls(sbi->nls_tab);
 565         kfree(sbi);
 566         return ret;
 567 }
 568
 569 static int jfs_freeze(struct super_block *sb)
 570 {
 571         struct jfs_sb_info *sbi = JFS_SBI(sb);
 572         struct jfs_log *log = sbi->log;
 573
 574         if (!(sb->s_flags & MS_RDONLY)) {
 575                 txQuiesce(sb);
 576                 lmLogShutdown(log);
 577                 updateSuper(sb, FM_CLEAN);
 578         }
 579         return 0;
 580 }
 581
 582 static int jfs_unfreeze(struct super_block *sb)
 583 {
 584         struct jfs_sb_info *sbi = JFS_SBI(sb);
 585         struct jfs_log *log = sbi->log;
 586         int rc = 0;
 587
 588         if (!(sb->s_flags & MS_RDONLY)) {
 589                 updateSuper(sb, FM_MOUNT);
 590                 if ((rc = lmLogInit(log)))
 591                         jfs_err("jfs_unlock failed with return code %d", rc);
 592                 else
 593                         txResume(sb);
 594         }
 595         return 0;
 596 }
 597
 598 static int jfs_get_sb(struct file_system_type *fs_type,
 599         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 600 {
 601         return get_sb_bdev(fs_type, flags, dev_name, data, jfs_fill_super,
 602                            mnt);
 603 }
 604
 605 static int jfs_sync_fs(struct super_block *sb, int wait)
 606 {
 607         struct jfs_log *log = JFS_SBI(sb)->log;
 608
 609         /* log == NULL indicates read-only mount */
 610         if (log) {
 611                 jfs_flush_journal(log, wait);
 612                 jfs_syncpt(log, 0);
 613         }
 614
 615         return 0;
 616 }
 617
 618 static int jfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
 619 {
 620         struct jfs_sb_info *sbi = JFS_SBI(vfs->mnt_sb);
 621
 622         if (sbi->uid != -1)
 623                 seq_printf(seq, ",uid=%d", sbi->uid);
 624         if (sbi->gid != -1)
 625                 seq_printf(seq, ",gid=%d", sbi->gid);
 626         if (sbi->umask != -1)
 627                 seq_printf(seq, ",umask=%03o", sbi->umask);
 628         if (sbi->flag & JFS_NOINTEGRITY)
 629                 seq_puts(seq, ",nointegrity");
 630         if (sbi->nls_tab)
 631                 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset);
 632         if (sbi->flag & JFS_ERR_CONTINUE)
 633                 seq_printf(seq, ",errors=continue");
 634         if (sbi->flag & JFS_ERR_PANIC)
 635                 seq_printf(seq, ",errors=panic");
 636
 637 #ifdef CONFIG_QUOTA
 638         if (sbi->flag & JFS_USRQUOTA)
 639                 seq_puts(seq, ",usrquota");
 640
 641         if (sbi->flag & JFS_GRPQUOTA)
 642                 seq_puts(seq, ",grpquota");
 643 #endif
 644
 645         return 0;
 646 }
 647
 648 #ifdef CONFIG_QUOTA
 649
 650 /* Read data from quotafile - avoid pagecache and such because we cannot afford
 651  * acquiring the locks... As quota files are never truncated and quota code
 652  * itself serializes the operations (and noone else should touch the files)
 653  * we don't have to be afraid of races */
 654 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
 655                               size_t len, loff_t off)
 656 {
 657         struct inode *inode = sb_dqopt(sb)->files[type];
 658         sector_t blk = off >> sb->s_blocksize_bits;
 659         int err = 0;
 660         int offset = off & (sb->s_blocksize - 1);
 661         int tocopy;
 662         size_t toread;
 663         struct buffer_head tmp_bh;
 664         struct buffer_head *bh;
 665         loff_t i_size = i_size_read(inode);
 666
 667         if (off > i_size)
 668                 return 0;
 669         if (off+len > i_size)
 670                 len = i_size-off;
 671         toread = len;
 672         while (toread > 0) {
 673                 tocopy = sb->s_blocksize - offset < toread ?
 674                                 sb->s_blocksize - offset : toread;
 675
 676                 tmp_bh.b_state = 0;
 677                 tmp_bh.b_size = 1 << inode->i_blkbits;
 678                 err = jfs_get_block(inode, blk, &tmp_bh, 0);
 679                 if (err)
 680                         return err;
 681                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
 682                         memset(data, 0, tocopy);
 683                 else {
 684                         bh = sb_bread(sb, tmp_bh.b_blocknr);
 685                         if (!bh)
 686                                 return -EIO;
 687                         memcpy(data, bh->b_data+offset, tocopy);
 688                         brelse(bh);
 689                 }
 690                 offset = 0;
 691                 toread -= tocopy;
 692                 data += tocopy;
 693                 blk++;
 694         }
 695         return len;
 696 }
 697
 698 /* Write to quotafile */
 699 static ssize_t jfs_quota_write(struct super_block *sb, int type,
 700                                const char *data, size_t len, loff_t off)
 701 {
 702         struct inode *inode = sb_dqopt(sb)->files[type];
 703         sector_t blk = off >> sb->s_blocksize_bits;
 704         int err = 0;
 705         int offset = off & (sb->s_blocksize - 1);
 706         int tocopy;
 707         size_t towrite = len;
 708         struct buffer_head tmp_bh;
 709         struct buffer_head *bh;
 710
 711         mutex_lock(&inode->i_mutex);
 712         while (towrite > 0) {
 713                 tocopy = sb->s_blocksize - offset < towrite ?
 714                                 sb->s_blocksize - offset : towrite;
 715
 716                 tmp_bh.b_state = 0;
 717                 tmp_bh.b_size = 1 << inode->i_blkbits;
 718                 err = jfs_get_block(inode, blk, &tmp_bh, 1);
 719                 if (err)
 720                         goto out;
 721                 if (offset || tocopy != sb->s_blocksize)
 722                         bh = sb_bread(sb, tmp_bh.b_blocknr);
 723                 else
 724                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
 725                 if (!bh) {
 726                         err = -EIO;
 727                         goto out;
 728                 }
 729                 lock_buffer(bh);
 730                 memcpy(bh->b_data+offset, data, tocopy);
 731                 flush_dcache_page(bh->b_page);
 732                 set_buffer_uptodate(bh);
 733                 mark_buffer_dirty(bh);
 734                 unlock_buffer(bh);
 735                 brelse(bh);
 736                 offset = 0;
 737                 towrite -= tocopy;
 738                 data += tocopy;
 739                 blk++;
 740         }
 741 out:
 742         if (len == towrite) {
 743                 mutex_unlock(&inode->i_mutex);
 744                 return err;
 745         }
 746         if (inode->i_size < off+len-towrite)
 747                 i_size_write(inode, off+len-towrite);
 748         inode->i_version++;
 749         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
 750         mark_inode_dirty(inode);
 751         mutex_unlock(&inode->i_mutex);
 752         return len - towrite;
 753 }
 754
 755 #endif
 756
 757 static const struct super_operations jfs_super_operations = {
 758         .alloc_inode    = jfs_alloc_inode,
 759         .destroy_inode  = jfs_destroy_inode,
 760         .dirty_inode    = jfs_dirty_inode,
 761         .write_inode    = jfs_write_inode,
 762         .delete_inode   = jfs_delete_inode,
 763         .put_super      = jfs_put_super,
 764         .sync_fs        = jfs_sync_fs,
 765         .freeze_fs      = jfs_freeze,
 766         .unfreeze_fs    = jfs_unfreeze,
 767         .statfs         = jfs_statfs,
 768         .remount_fs     = jfs_remount,
 769         .show_options   = jfs_show_options,
 770 #ifdef CONFIG_QUOTA
 771         .quota_read     = jfs_quota_read,
 772         .quota_write    = jfs_quota_write,
 773 #endif
 774 };
 775
 776 static const struct export_operations jfs_export_operations = {
 777         .fh_to_dentry   = jfs_fh_to_dentry,
 778         .fh_to_parent   = jfs_fh_to_parent,
 779         .get_parent     = jfs_get_parent,
 780 };
 781
 782 static struct file_system_type jfs_fs_type = {
 783         .owner          = THIS_MODULE,
 784         .name           = "jfs",
 785         .get_sb         = jfs_get_sb,
 786         .kill_sb        = kill_block_super,
 787         .fs_flags       = FS_REQUIRES_DEV,
 788 };
 789
 790 static void init_once(void *foo)
 791 {
 792         struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
 793
 794         memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
 795         INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
 796         init_rwsem(&jfs_ip->rdwrlock);
 797         mutex_init(&jfs_ip->commit_mutex);
 798         init_rwsem(&jfs_ip->xattr_sem);
 799         spin_lock_init(&jfs_ip->ag_lock);
 800         jfs_ip->active_ag = -1;
 801 #ifdef CONFIG_JFS_POSIX_ACL
 802         jfs_ip->i_acl = JFS_ACL_NOT_CACHED;
 803         jfs_ip->i_default_acl = JFS_ACL_NOT_CACHED;
 804 #endif
 805         inode_init_once(&jfs_ip->vfs_inode);
 806 }
 807
 808 static int __init init_jfs_fs(void)
 809 {
 810         int i;
 811         int rc;
 812
 813         jfs_inode_cachep =
 814             kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
 815                             SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
 816                             init_once);
 817         if (jfs_inode_cachep == NULL)
 818                 return -ENOMEM;
 819
 820         /*
 821          * Metapage initialization
 822          */
 823         rc = metapage_init();
 824         if (rc) {
 825                 jfs_err("metapage_init failed w/rc = %d", rc);
 826                 goto free_slab;
 827         }
 828
 829         /*
 830          * Transaction Manager initialization
 831          */
 832         rc = txInit();
 833         if (rc) {
 834                 jfs_err("txInit failed w/rc = %d", rc);
 835                 goto free_metapage;
 836         }
 837
 838         /*
 839          * I/O completion thread (endio)
 840          */
 841         jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
 842         if (IS_ERR(jfsIOthread)) {
 843                 rc = PTR_ERR(jfsIOthread);
 844                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
 845                 goto end_txmngr;
 846         }
 847
 848         if (commit_threads < 1)
 849                 commit_threads = num_online_cpus();
 850         if (commit_threads > MAX_COMMIT_THREADS)
 851                 commit_threads = MAX_COMMIT_THREADS;
 852
 853         for (i = 0; i < commit_threads; i++) {
 854                 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, "jfsCommit");
 855                 if (IS_ERR(jfsCommitThread[i])) {
 856                         rc = PTR_ERR(jfsCommitThread[i]);
 857                         jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
 858                         commit_threads = i;
 859                         goto kill_committask;
 860                 }
 861         }
 862
 863         jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
 864         if (IS_ERR(jfsSyncThread)) {
 865                 rc = PTR_ERR(jfsSyncThread);
 866                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
 867                 goto kill_committask;
 868         }
 869
 870 #ifdef PROC_FS_JFS
 871         jfs_proc_init();
 872 #endif
 873
 874         return register_filesystem(&jfs_fs_type);
 875
 876 kill_committask:
 877         for (i = 0; i < commit_threads; i++)
 878                 kthread_stop(jfsCommitThread[i]);
 879         kthread_stop(jfsIOthread);
 880 end_txmngr:
 881         txExit();
 882 free_metapage:
 883         metapage_exit();
 884 free_slab:
 885         kmem_cache_destroy(jfs_inode_cachep);
 886         return rc;
 887 }
 888
 889 static void __exit exit_jfs_fs(void)
 890 {
 891         int i;
 892
 893         jfs_info("exit_jfs_fs called");
 894
 895         txExit();
 896         metapage_exit();
 897
 898         kthread_stop(jfsIOthread);
 899         for (i = 0; i < commit_threads; i++)
 900                 kthread_stop(jfsCommitThread[i]);
 901         kthread_stop(jfsSyncThread);
 902 #ifdef PROC_FS_JFS
 903         jfs_proc_clean();
 904 #endif
 905         unregister_filesystem(&jfs_fs_type);
 906         kmem_cache_destroy(jfs_inode_cachep);
 907 }
 908
 909 module_init(init_jfs_fs)
 910 module_exit(exit_jfs_fs)