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 #ifdef CONFIG_QUOTA
 485         sb->dq_op = &dquot_operations;
 486         sb->s_qcop = &dquot_quotactl_ops;
 487 #endif
 488
 489         /*
 490          * Initialize direct-mapping inode/address-space
 491          */
 492         inode = new_inode(sb);
 493         if (inode == NULL) {
 494                 ret = -ENOMEM;
 495                 goto out_unload;
 496         }
 497         inode->i_ino = 0;
 498         inode->i_nlink = 1;
 499         inode->i_size = sb->s_bdev->bd_inode->i_size;
 500         inode->i_mapping->a_ops = &jfs_metapage_aops;
 501         insert_inode_hash(inode);
 502         mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
 503
 504         sbi->direct_inode = inode;
 505
 506         rc = jfs_mount(sb);
 507         if (rc) {
 508                 if (!silent) {
 509                         jfs_err("jfs_mount failed w/return code = %d", rc);
 510                 }
 511                 goto out_mount_failed;
 512         }
 513         if (sb->s_flags & MS_RDONLY)
 514                 sbi->log = NULL;
 515         else {
 516                 rc = jfs_mount_rw(sb, 0);
 517                 if (rc) {
 518                         if (!silent) {
 519                                 jfs_err("jfs_mount_rw failed, return code = %d",
 520                                         rc);
 521                         }
 522                         goto out_no_rw;
 523                 }
 524         }
 525
 526         sb->s_magic = JFS_SUPER_MAGIC;
 527
 528         inode = jfs_iget(sb, ROOT_I);
 529         if (IS_ERR(inode)) {
 530                 ret = PTR_ERR(inode);
 531                 goto out_no_rw;
 532         }
 533         sb->s_root = d_alloc_root(inode);
 534         if (!sb->s_root)
 535                 goto out_no_root;
 536
 537         if (sbi->mntflag & JFS_OS2)
 538                 sb->s_root->d_op = &jfs_ci_dentry_operations;
 539
 540         /* logical blocks are represented by 40 bits in pxd_t, etc. */
 541         sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
 542 #if BITS_PER_LONG == 32
 543         /*
 544          * Page cache is indexed by long.
 545          * I would use MAX_LFS_FILESIZE, but it's only half as big
 546          */
 547         sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, (u64)sb->s_maxbytes);
 548 #endif
 549         sb->s_time_gran = 1;
 550         return 0;
 551
 552 out_no_root:
 553         jfs_err("jfs_read_super: get root dentry failed");
 554         iput(inode);
 555
 556 out_no_rw:
 557         rc = jfs_umount(sb);
 558         if (rc) {
 559                 jfs_err("jfs_umount failed with return code %d", rc);
 560         }
 561 out_mount_failed:
 562         filemap_write_and_wait(sbi->direct_inode->i_mapping);
 563         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
 564         make_bad_inode(sbi->direct_inode);
 565         iput(sbi->direct_inode);
 566         sbi->direct_inode = NULL;
 567 out_unload:
 568         if (sbi->nls_tab)
 569                 unload_nls(sbi->nls_tab);
 570 out_kfree:
 571         kfree(sbi);
 572         return ret;
 573 }
 574
 575 static int jfs_freeze(struct super_block *sb)
 576 {
 577         struct jfs_sb_info *sbi = JFS_SBI(sb);
 578         struct jfs_log *log = sbi->log;
 579
 580         if (!(sb->s_flags & MS_RDONLY)) {
 581                 txQuiesce(sb);
 582                 lmLogShutdown(log);
 583                 updateSuper(sb, FM_CLEAN);
 584         }
 585         return 0;
 586 }
 587
 588 static int jfs_unfreeze(struct super_block *sb)
 589 {
 590         struct jfs_sb_info *sbi = JFS_SBI(sb);
 591         struct jfs_log *log = sbi->log;
 592         int rc = 0;
 593
 594         if (!(sb->s_flags & MS_RDONLY)) {
 595                 updateSuper(sb, FM_MOUNT);
 596                 if ((rc = lmLogInit(log)))
 597                         jfs_err("jfs_unlock failed with return code %d", rc);
 598                 else
 599                         txResume(sb);
 600         }
 601         return 0;
 602 }
 603
 604 static int jfs_get_sb(struct file_system_type *fs_type,
 605         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 606 {
 607         return get_sb_bdev(fs_type, flags, dev_name, data, jfs_fill_super,
 608                            mnt);
 609 }
 610
 611 static int jfs_sync_fs(struct super_block *sb, int wait)
 612 {
 613         struct jfs_log *log = JFS_SBI(sb)->log;
 614
 615         /* log == NULL indicates read-only mount */
 616         if (log) {
 617                 jfs_flush_journal(log, wait);
 618                 jfs_syncpt(log, 0);
 619         }
 620
 621         return 0;
 622 }
 623
 624 static int jfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
 625 {
 626         struct jfs_sb_info *sbi = JFS_SBI(vfs->mnt_sb);
 627
 628         if (sbi->uid != -1)
 629                 seq_printf(seq, ",uid=%d", sbi->uid);
 630         if (sbi->gid != -1)
 631                 seq_printf(seq, ",gid=%d", sbi->gid);
 632         if (sbi->umask != -1)
 633                 seq_printf(seq, ",umask=%03o", sbi->umask);
 634         if (sbi->flag & JFS_NOINTEGRITY)
 635                 seq_puts(seq, ",nointegrity");
 636         if (sbi->nls_tab)
 637                 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset);
 638         if (sbi->flag & JFS_ERR_CONTINUE)
 639                 seq_printf(seq, ",errors=continue");
 640         if (sbi->flag & JFS_ERR_PANIC)
 641                 seq_printf(seq, ",errors=panic");
 642
 643 #ifdef CONFIG_QUOTA
 644         if (sbi->flag & JFS_USRQUOTA)
 645                 seq_puts(seq, ",usrquota");
 646
 647         if (sbi->flag & JFS_GRPQUOTA)
 648                 seq_puts(seq, ",grpquota");
 649 #endif
 650
 651         return 0;
 652 }
 653
 654 #ifdef CONFIG_QUOTA
 655
 656 /* Read data from quotafile - avoid pagecache and such because we cannot afford
 657  * acquiring the locks... As quota files are never truncated and quota code
 658  * itself serializes the operations (and noone else should touch the files)
 659  * we don't have to be afraid of races */
 660 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
 661                               size_t len, loff_t off)
 662 {
 663         struct inode *inode = sb_dqopt(sb)->files[type];
 664         sector_t blk = off >> sb->s_blocksize_bits;
 665         int err = 0;
 666         int offset = off & (sb->s_blocksize - 1);
 667         int tocopy;
 668         size_t toread;
 669         struct buffer_head tmp_bh;
 670         struct buffer_head *bh;
 671         loff_t i_size = i_size_read(inode);
 672
 673         if (off > i_size)
 674                 return 0;
 675         if (off+len > i_size)
 676                 len = i_size-off;
 677         toread = len;
 678         while (toread > 0) {
 679                 tocopy = sb->s_blocksize - offset < toread ?
 680                                 sb->s_blocksize - offset : toread;
 681
 682                 tmp_bh.b_state = 0;
 683                 tmp_bh.b_size = 1 << inode->i_blkbits;
 684                 err = jfs_get_block(inode, blk, &tmp_bh, 0);
 685                 if (err)
 686                         return err;
 687                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
 688                         memset(data, 0, tocopy);
 689                 else {
 690                         bh = sb_bread(sb, tmp_bh.b_blocknr);
 691                         if (!bh)
 692                                 return -EIO;
 693                         memcpy(data, bh->b_data+offset, tocopy);
 694                         brelse(bh);
 695                 }
 696                 offset = 0;
 697                 toread -= tocopy;
 698                 data += tocopy;
 699                 blk++;
 700         }
 701         return len;
 702 }
 703
 704 /* Write to quotafile */
 705 static ssize_t jfs_quota_write(struct super_block *sb, int type,
 706                                const char *data, size_t len, loff_t off)
 707 {
 708         struct inode *inode = sb_dqopt(sb)->files[type];
 709         sector_t blk = off >> sb->s_blocksize_bits;
 710         int err = 0;
 711         int offset = off & (sb->s_blocksize - 1);
 712         int tocopy;
 713         size_t towrite = len;
 714         struct buffer_head tmp_bh;
 715         struct buffer_head *bh;
 716
 717         mutex_lock(&inode->i_mutex);
 718         while (towrite > 0) {
 719                 tocopy = sb->s_blocksize - offset < towrite ?
 720                                 sb->s_blocksize - offset : towrite;
 721
 722                 tmp_bh.b_state = 0;
 723                 tmp_bh.b_size = 1 << inode->i_blkbits;
 724                 err = jfs_get_block(inode, blk, &tmp_bh, 1);
 725                 if (err)
 726                         goto out;
 727                 if (offset || tocopy != sb->s_blocksize)
 728                         bh = sb_bread(sb, tmp_bh.b_blocknr);
 729                 else
 730                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
 731                 if (!bh) {
 732                         err = -EIO;
 733                         goto out;
 734                 }
 735                 lock_buffer(bh);
 736                 memcpy(bh->b_data+offset, data, tocopy);
 737                 flush_dcache_page(bh->b_page);
 738                 set_buffer_uptodate(bh);
 739                 mark_buffer_dirty(bh);
 740                 unlock_buffer(bh);
 741                 brelse(bh);
 742                 offset = 0;
 743                 towrite -= tocopy;
 744                 data += tocopy;
 745                 blk++;
 746         }
 747 out:
 748         if (len == towrite) {
 749                 mutex_unlock(&inode->i_mutex);
 750                 return err;
 751         }
 752         if (inode->i_size < off+len-towrite)
 753                 i_size_write(inode, off+len-towrite);
 754         inode->i_version++;
 755         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
 756         mark_inode_dirty(inode);
 757         mutex_unlock(&inode->i_mutex);
 758         return len - towrite;
 759 }
 760
 761 #endif
 762
 763 static const struct super_operations jfs_super_operations = {
 764         .alloc_inode    = jfs_alloc_inode,
 765         .destroy_inode  = jfs_destroy_inode,
 766         .dirty_inode    = jfs_dirty_inode,
 767         .write_inode    = jfs_write_inode,
 768         .delete_inode   = jfs_delete_inode,
 769         .clear_inode    = jfs_clear_inode,
 770         .put_super      = jfs_put_super,
 771         .sync_fs        = jfs_sync_fs,
 772         .freeze_fs      = jfs_freeze,
 773         .unfreeze_fs    = jfs_unfreeze,
 774         .statfs         = jfs_statfs,
 775         .remount_fs     = jfs_remount,
 776         .show_options   = jfs_show_options,
 777 #ifdef CONFIG_QUOTA
 778         .quota_read     = jfs_quota_read,
 779         .quota_write    = jfs_quota_write,
 780 #endif
 781 };
 782
 783 static const struct export_operations jfs_export_operations = {
 784         .fh_to_dentry   = jfs_fh_to_dentry,
 785         .fh_to_parent   = jfs_fh_to_parent,
 786         .get_parent     = jfs_get_parent,
 787 };
 788
 789 static struct file_system_type jfs_fs_type = {
 790         .owner          = THIS_MODULE,
 791         .name           = "jfs",
 792         .get_sb         = jfs_get_sb,
 793         .kill_sb        = kill_block_super,
 794         .fs_flags       = FS_REQUIRES_DEV,
 795 };
 796
 797 static void init_once(void *foo)
 798 {
 799         struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
 800
 801         memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
 802         INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
 803         init_rwsem(&jfs_ip->rdwrlock);
 804         mutex_init(&jfs_ip->commit_mutex);
 805         init_rwsem(&jfs_ip->xattr_sem);
 806         spin_lock_init(&jfs_ip->ag_lock);
 807         jfs_ip->active_ag = -1;
 808         inode_init_once(&jfs_ip->vfs_inode);
 809 }
 810
 811 static int __init init_jfs_fs(void)
 812 {
 813         int i;
 814         int rc;
 815
 816         jfs_inode_cachep =
 817             kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
 818                             SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
 819                             init_once);
 820         if (jfs_inode_cachep == NULL)
 821                 return -ENOMEM;
 822
 823         /*
 824          * Metapage initialization
 825          */
 826         rc = metapage_init();
 827         if (rc) {
 828                 jfs_err("metapage_init failed w/rc = %d", rc);
 829                 goto free_slab;
 830         }
 831
 832         /*
 833          * Transaction Manager initialization
 834          */
 835         rc = txInit();
 836         if (rc) {
 837                 jfs_err("txInit failed w/rc = %d", rc);
 838                 goto free_metapage;
 839         }
 840
 841         /*
 842          * I/O completion thread (endio)
 843          */
 844         jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
 845         if (IS_ERR(jfsIOthread)) {
 846                 rc = PTR_ERR(jfsIOthread);
 847                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
 848                 goto end_txmngr;
 849         }
 850
 851         if (commit_threads < 1)
 852                 commit_threads = num_online_cpus();
 853         if (commit_threads > MAX_COMMIT_THREADS)
 854                 commit_threads = MAX_COMMIT_THREADS;
 855
 856         for (i = 0; i < commit_threads; i++) {
 857                 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, "jfsCommit");
 858                 if (IS_ERR(jfsCommitThread[i])) {
 859                         rc = PTR_ERR(jfsCommitThread[i]);
 860                         jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
 861                         commit_threads = i;
 862                         goto kill_committask;
 863                 }
 864         }
 865
 866         jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
 867         if (IS_ERR(jfsSyncThread)) {
 868                 rc = PTR_ERR(jfsSyncThread);
 869                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
 870                 goto kill_committask;
 871         }
 872
 873 #ifdef PROC_FS_JFS
 874         jfs_proc_init();
 875 #endif
 876
 877         return register_filesystem(&jfs_fs_type);
 878
 879 kill_committask:
 880         for (i = 0; i < commit_threads; i++)
 881                 kthread_stop(jfsCommitThread[i]);
 882         kthread_stop(jfsIOthread);
 883 end_txmngr:
 884         txExit();
 885 free_metapage:
 886         metapage_exit();
 887 free_slab:
 888         kmem_cache_destroy(jfs_inode_cachep);
 889         return rc;
 890 }
 891
 892 static void __exit exit_jfs_fs(void)
 893 {
 894         int i;
 895
 896         jfs_info("exit_jfs_fs called");
 897
 898         txExit();
 899         metapage_exit();
 900
 901         kthread_stop(jfsIOthread);
 902         for (i = 0; i < commit_threads; i++)
 903                 kthread_stop(jfsCommitThread[i]);
 904         kthread_stop(jfsSyncThread);
 905 #ifdef PROC_FS_JFS
 906         jfs_proc_clean();
 907 #endif
 908         unregister_filesystem(&jfs_fs_type);
 909         kmem_cache_destroy(jfs_inode_cachep);
 910 }
 911
 912 module_init(init_jfs_fs)
 913 module_exit(exit_jfs_fs)