fs/jfs/super.c

   1 /*
   2  *   Copyright (C) International Business Machines Corp., 2000-2004
   3  *   Portions Copyright (C) Christoph Hellwig, 2001-2002
   4  *
   5  *   This program is free software;  you can redistribute it and/or modify
   6  *   it under the terms of the GNU General Public License as published by
   7  *   the Free Software Foundation; either version 2 of the License, or
   8  *   (at your option) any later version.
   9  *
  10  *   This program is distributed in the hope that it will be useful,
  11  *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  13  *   the GNU General Public License for more details.
  14  *
  15  *   You should have received a copy of the GNU General Public License
  16  *   along with this program;  if not, write to the Free Software
  17  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  18  */
  19
  20 #include <linux/fs.h>
  21 #include <linux/module.h>
  22 #include <linux/parser.h>
  23 #include <linux/completion.h>
  24 #include <linux/vfs.h>
  25 #include <linux/quotaops.h>
  26 #include <linux/mount.h>
  27 #include <linux/moduleparam.h>
  28 #include <linux/kthread.h>
  29 #include <linux/posix_acl.h>
  30 #include <linux/buffer_head.h>
  31 #include <linux/exportfs.h>
  32 #include <linux/crc32.h>
  33 #include <linux/slab.h>
  34 #include <asm/uaccess.h>
  35 #include <linux/seq_file.h>
  36
  37 #include "jfs_incore.h"
  38 #include "jfs_filsys.h"
  39 #include "jfs_inode.h"
  40 #include "jfs_metapage.h"
  41 #include "jfs_superblock.h"
  42 #include "jfs_dmap.h"
  43 #include "jfs_imap.h"
  44 #include "jfs_acl.h"
  45 #include "jfs_debug.h"
  46
  47 MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
  48 MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
  49 MODULE_LICENSE("GPL");
  50
  51 static struct kmem_cache * jfs_inode_cachep;
  52
  53 static const struct super_operations jfs_super_operations;
  54 static const struct export_operations jfs_export_operations;
  55 static struct file_system_type jfs_fs_type;
  56
  57 #define MAX_COMMIT_THREADS 64
  58 static int commit_threads = 0;
  59 module_param(commit_threads, int, 0);
  60 MODULE_PARM_DESC(commit_threads, "Number of commit threads");
  61
  62 static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS];
  63 struct task_struct *jfsIOthread;
  64 struct task_struct *jfsSyncThread;
  65
  66 #ifdef CONFIG_JFS_DEBUG
  67 int jfsloglevel = JFS_LOGLEVEL_WARN;
  68 module_param(jfsloglevel, int, 0644);
  69 MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
  70 #endif
  71
  72 static void jfs_handle_error(struct super_block *sb)
  73 {
  74         struct jfs_sb_info *sbi = JFS_SBI(sb);
  75
  76         if (sb->s_flags & MS_RDONLY)
  77                 return;
  78
  79         updateSuper(sb, FM_DIRTY);
  80
  81         if (sbi->flag & JFS_ERR_PANIC)
  82                 panic("JFS (device %s): panic forced after error\n",
  83                         sb->s_id);
  84         else if (sbi->flag & JFS_ERR_REMOUNT_RO) {
  85                 jfs_err("ERROR: (device %s): remounting filesystem "
  86                         "as read-only\n",
  87                         sb->s_id);
  88                 sb->s_flags |= MS_RDONLY;
  89         }
  90
  91         /* nothing is done for continue beyond marking the superblock dirty */
  92 }
  93
  94 void jfs_error(struct super_block *sb, const char * function, ...)
  95 {
  96         static char error_buf[256];
  97         va_list args;
  98
  99         va_start(args, function);
 100         vsnprintf(error_buf, sizeof(error_buf), function, args);
 101         va_end(args);
 102
 103         printk(KERN_ERR "ERROR: (device %s): %s\n", sb->s_id, error_buf);
 104
 105         jfs_handle_error(sb);
 106 }
 107
 108 static struct inode *jfs_alloc_inode(struct super_block *sb)
 109 {
 110         struct jfs_inode_info *jfs_inode;
 111
 112         jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS);
 113         if (!jfs_inode)
 114                 return NULL;
 115         return &jfs_inode->vfs_inode;
 116 }
 117
 118 static void jfs_i_callback(struct rcu_head *head)
 119 {
 120         struct inode *inode = container_of(head, struct inode, i_rcu);
 121         struct jfs_inode_info *ji = JFS_IP(inode);
 122         INIT_LIST_HEAD(&inode->i_dentry);
 123         kmem_cache_free(jfs_inode_cachep, ji);
 124 }
 125
 126 static void jfs_destroy_inode(struct inode *inode)
 127 {
 128         struct jfs_inode_info *ji = JFS_IP(inode);
 129
 130         BUG_ON(!list_empty(&ji->anon_inode_list));
 131
 132         spin_lock_irq(&ji->ag_lock);
 133         if (ji->active_ag != -1) {
 134                 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
 135                 atomic_dec(&bmap->db_active[ji->active_ag]);
 136                 ji->active_ag = -1;
 137         }
 138         spin_unlock_irq(&ji->ag_lock);
 139         call_rcu(&inode->i_rcu, jfs_i_callback);
 140 }
 141
 142 static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 143 {
 144         struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb);
 145         s64 maxinodes;
 146         struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
 147
 148         jfs_info("In jfs_statfs");
 149         buf->f_type = JFS_SUPER_MAGIC;
 150         buf->f_bsize = sbi->bsize;
 151         buf->f_blocks = sbi->bmap->db_mapsize;
 152         buf->f_bfree = sbi->bmap->db_nfree;
 153         buf->f_bavail = sbi->bmap->db_nfree;
 154         /*
 155          * If we really return the number of allocated & free inodes, some
 156          * applications will fail because they won't see enough free inodes.
 157          * We'll try to calculate some guess as to how may inodes we can
 158          * really allocate
 159          *
 160          * buf->f_files = atomic_read(&imap->im_numinos);
 161          * buf->f_ffree = atomic_read(&imap->im_numfree);
 162          */
 163         maxinodes = min((s64) atomic_read(&imap->im_numinos) +
 164                         ((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
 165                          << L2INOSPEREXT), (s64) 0xffffffffLL);
 166         buf->f_files = maxinodes;
 167         buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
 168                                     atomic_read(&imap->im_numfree));
 169         buf->f_fsid.val[0] = (u32)crc32_le(0, sbi->uuid, sizeof(sbi->uuid)/2);
 170         buf->f_fsid.val[1] = (u32)crc32_le(0, sbi->uuid + sizeof(sbi->uuid)/2,
 171                                         sizeof(sbi->uuid)/2);
 172
 173         buf->f_namelen = JFS_NAME_MAX;
 174         return 0;
 175 }
 176
 177 static void jfs_put_super(struct super_block *sb)
 178 {
 179         struct jfs_sb_info *sbi = JFS_SBI(sb);
 180         int rc;
 181
 182         jfs_info("In jfs_put_super");
 183
 184         dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
 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
 198 enum {
 199         Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
 200         Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota,
 201         Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask
 202 };
 203
 204 static const match_table_t tokens = {
 205         {Opt_integrity, "integrity"},
 206         {Opt_nointegrity, "nointegrity"},
 207         {Opt_iocharset, "iocharset=%s"},
 208         {Opt_resize, "resize=%u"},
 209         {Opt_resize_nosize, "resize"},
 210         {Opt_errors, "errors=%s"},
 211         {Opt_ignore, "noquota"},
 212         {Opt_ignore, "quota"},
 213         {Opt_usrquota, "usrquota"},
 214         {Opt_grpquota, "grpquota"},
 215         {Opt_uid, "uid=%u"},
 216         {Opt_gid, "gid=%u"},
 217         {Opt_umask, "umask=%u"},
 218         {Opt_err, NULL}
 219 };
 220
 221 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
 222                          int *flag)
 223 {
 224         void *nls_map = (void *)-1;     /* -1: no change;  NULL: none */
 225         char *p;
 226         struct jfs_sb_info *sbi = JFS_SBI(sb);
 227
 228         *newLVSize = 0;
 229
 230         if (!options)
 231                 return 1;
 232
 233         while ((p = strsep(&options, ",")) != NULL) {
 234                 substring_t args[MAX_OPT_ARGS];
 235                 int token;
 236                 if (!*p)
 237                         continue;
 238
 239                 token = match_token(p, tokens, args);
 240                 switch (token) {
 241                 case Opt_integrity:
 242                         *flag &= ~JFS_NOINTEGRITY;
 243                         break;
 244                 case Opt_nointegrity:
 245                         *flag |= JFS_NOINTEGRITY;
 246                         break;
 247                 case Opt_ignore:
 248                         /* Silently ignore the quota options */
 249                         /* Don't do anything ;-) */
 250                         break;
 251                 case Opt_iocharset:
 252                         if (nls_map && nls_map != (void *) -1)
 253                                 unload_nls(nls_map);
 254                         if (!strcmp(args[0].from, "none"))
 255                                 nls_map = NULL;
 256                         else {
 257                                 nls_map = load_nls(args[0].from);
 258                                 if (!nls_map) {
 259                                         printk(KERN_ERR
 260                                                "JFS: charset not found\n");
 261                                         goto cleanup;
 262                                 }
 263                         }
 264                         break;
 265                 case Opt_resize:
 266                 {
 267                         char *resize = args[0].from;
 268                         *newLVSize = simple_strtoull(resize, &resize, 0);
 269                         break;
 270                 }
 271                 case Opt_resize_nosize:
 272                 {
 273                         *newLVSize = sb->s_bdev->bd_inode->i_size >>
 274                                 sb->s_blocksize_bits;
 275                         if (*newLVSize == 0)
 276                                 printk(KERN_ERR
 277                                        "JFS: Cannot determine volume size\n");
 278                         break;
 279                 }
 280                 case Opt_errors:
 281                 {
 282                         char *errors = args[0].from;
 283                         if (!errors || !*errors)
 284                                 goto cleanup;
 285                         if (!strcmp(errors, "continue")) {
 286                                 *flag &= ~JFS_ERR_REMOUNT_RO;
 287                                 *flag &= ~JFS_ERR_PANIC;
 288                                 *flag |= JFS_ERR_CONTINUE;
 289                         } else if (!strcmp(errors, "remount-ro")) {
 290                                 *flag &= ~JFS_ERR_CONTINUE;
 291                                 *flag &= ~JFS_ERR_PANIC;
 292                                 *flag |= JFS_ERR_REMOUNT_RO;
 293                         } else if (!strcmp(errors, "panic")) {
 294                                 *flag &= ~JFS_ERR_CONTINUE;
 295                                 *flag &= ~JFS_ERR_REMOUNT_RO;
 296                                 *flag |= JFS_ERR_PANIC;
 297                         } else {
 298                                 printk(KERN_ERR
 299                                        "JFS: %s is an invalid error handler\n",
 300                                        errors);
 301                                 goto cleanup;
 302                         }
 303                         break;
 304                 }
 305
 306 #ifdef CONFIG_QUOTA
 307                 case Opt_quota:
 308                 case Opt_usrquota:
 309                         *flag |= JFS_USRQUOTA;
 310                         break;
 311                 case Opt_grpquota:
 312                         *flag |= JFS_GRPQUOTA;
 313                         break;
 314 #else
 315                 case Opt_usrquota:
 316                 case Opt_grpquota:
 317                 case Opt_quota:
 318                         printk(KERN_ERR
 319                                "JFS: quota operations not supported\n");
 320                         break;
 321 #endif
 322                 case Opt_uid:
 323                 {
 324                         char *uid = args[0].from;
 325                         sbi->uid = simple_strtoul(uid, &uid, 0);
 326                         break;
 327                 }
 328                 case Opt_gid:
 329                 {
 330                         char *gid = args[0].from;
 331                         sbi->gid = simple_strtoul(gid, &gid, 0);
 332                         break;
 333                 }
 334                 case Opt_umask:
 335                 {
 336                         char *umask = args[0].from;
 337                         sbi->umask = simple_strtoul(umask, &umask, 8);
 338                         if (sbi->umask & ~0777) {
 339                                 printk(KERN_ERR
 340                                        "JFS: Invalid value of umask\n");
 341                                 goto cleanup;
 342                         }
 343                         break;
 344                 }
 345                 default:
 346                         printk("jfs: Unrecognized mount option \"%s\" "
 347                                         " or missing value\n", p);
 348                         goto cleanup;
 349                 }
 350         }
 351
 352         if (nls_map != (void *) -1) {
 353                 /* Discard old (if remount) */
 354                 unload_nls(sbi->nls_tab);
 355                 sbi->nls_tab = nls_map;
 356         }
 357         return 1;
 358
 359 cleanup:
 360         if (nls_map && nls_map != (void *) -1)
 361                 unload_nls(nls_map);
 362         return 0;
 363 }
 364
 365 static int jfs_remount(struct super_block *sb, int *flags, char *data)
 366 {
 367         s64 newLVSize = 0;
 368         int rc = 0;
 369         int flag = JFS_SBI(sb)->flag;
 370         int ret;
 371
 372         if (!parse_options(data, sb, &newLVSize, &flag)) {
 373                 return -EINVAL;
 374         }
 375
 376         if (newLVSize) {
 377                 if (sb->s_flags & MS_RDONLY) {
 378                         printk(KERN_ERR
 379                   "JFS: resize requires volume to be mounted read-write\n");
 380                         return -EROFS;
 381                 }
 382                 rc = jfs_extendfs(sb, newLVSize, 0);
 383                 if (rc)
 384                         return rc;
 385         }
 386
 387         if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
 388                 /*
 389                  * Invalidate any previously read metadata.  fsck may have
 390                  * changed the on-disk data since we mounted r/o
 391                  */
 392                 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
 393
 394                 JFS_SBI(sb)->flag = flag;
 395                 ret = jfs_mount_rw(sb, 1);
 396
 397                 /* mark the fs r/w for quota activity */
 398                 sb->s_flags &= ~MS_RDONLY;
 399
 400                 dquot_resume(sb, -1);
 401                 return ret;
 402         }
 403         if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
 404                 rc = dquot_suspend(sb, -1);
 405                 if (rc < 0) {
 406                         return rc;
 407                 }
 408                 rc = jfs_umount_rw(sb);
 409                 JFS_SBI(sb)->flag = flag;
 410                 return rc;
 411         }
 412         if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
 413                 if (!(sb->s_flags & MS_RDONLY)) {
 414                         rc = jfs_umount_rw(sb);
 415                         if (rc)
 416                                 return rc;
 417
 418                         JFS_SBI(sb)->flag = flag;
 419                         ret = jfs_mount_rw(sb, 1);
 420                         return ret;
 421                 }
 422         JFS_SBI(sb)->flag = flag;
 423
 424         return 0;
 425 }
 426
 427 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
 428 {
 429         struct jfs_sb_info *sbi;
 430         struct inode *inode;
 431         int rc;
 432         s64 newLVSize = 0;
 433         int flag, ret = -EINVAL;
 434
 435         jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
 436
 437         if (!new_valid_dev(sb->s_bdev->bd_dev))
 438                 return -EOVERFLOW;
 439
 440         sbi = kzalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
 441         if (!sbi)
 442                 return -ENOMEM;
 443
 444         sb->s_fs_info = sbi;
 445         sbi->sb = sb;
 446         sbi->uid = sbi->gid = sbi->umask = -1;
 447
 448         /* initialize the mount flag and determine the default error handler */
 449         flag = JFS_ERR_REMOUNT_RO;
 450
 451         if (!parse_options((char *) data, sb, &newLVSize, &flag))
 452                 goto out_kfree;
 453         sbi->flag = flag;
 454
 455 #ifdef CONFIG_JFS_POSIX_ACL
 456         sb->s_flags |= MS_POSIXACL;
 457 #endif
 458
 459         if (newLVSize) {
 460                 printk(KERN_ERR "resize option for remount only\n");
 461                 goto out_kfree;
 462         }
 463
 464         /*
 465          * Initialize blocksize to 4K.
 466          */
 467         sb_set_blocksize(sb, PSIZE);
 468
 469         /*
 470          * Set method vectors.
 471          */
 472         sb->s_op = &jfs_super_operations;
 473         sb->s_export_op = &jfs_export_operations;
 474 #ifdef CONFIG_QUOTA
 475         sb->dq_op = &dquot_operations;
 476         sb->s_qcop = &dquot_quotactl_ops;
 477 #endif
 478
 479         /*
 480          * Initialize direct-mapping inode/address-space
 481          */
 482         inode = new_inode(sb);
 483         if (inode == NULL) {
 484                 ret = -ENOMEM;
 485                 goto out_unload;
 486         }
 487         inode->i_ino = 0;
 488         inode->i_size = sb->s_bdev->bd_inode->i_size;
 489         inode->i_mapping->a_ops = &jfs_metapage_aops;
 490         insert_inode_hash(inode);
 491         mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
 492
 493         sbi->direct_inode = inode;
 494
 495         rc = jfs_mount(sb);
 496         if (rc) {
 497                 if (!silent) {
 498                         jfs_err("jfs_mount failed w/return code = %d", rc);
 499                 }
 500                 goto out_mount_failed;
 501         }
 502         if (sb->s_flags & MS_RDONLY)
 503                 sbi->log = NULL;
 504         else {
 505                 rc = jfs_mount_rw(sb, 0);
 506                 if (rc) {
 507                         if (!silent) {
 508                                 jfs_err("jfs_mount_rw failed, return code = %d",
 509                                         rc);
 510                         }
 511                         goto out_no_rw;
 512                 }
 513         }
 514
 515         sb->s_magic = JFS_SUPER_MAGIC;
 516
 517         if (sbi->mntflag & JFS_OS2)
 518                 sb->s_d_op = &jfs_ci_dentry_operations;
 519
 520         inode = jfs_iget(sb, ROOT_I);
 521         if (IS_ERR(inode)) {
 522                 ret = PTR_ERR(inode);
 523                 goto out_no_rw;
 524         }
 525         sb->s_root = d_alloc_root(inode);
 526         if (!sb->s_root)
 527                 goto out_no_root;
 528
 529         /* logical blocks are represented by 40 bits in pxd_t, etc. */
 530         sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
 531 #if BITS_PER_LONG == 32
 532         /*
 533          * Page cache is indexed by long.
 534          * I would use MAX_LFS_FILESIZE, but it's only half as big
 535          */
 536         sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, (u64)sb->s_maxbytes);
 537 #endif
 538         sb->s_time_gran = 1;
 539         return 0;
 540
 541 out_no_root:
 542         jfs_err("jfs_read_super: get root dentry failed");
 543         iput(inode);
 544
 545 out_no_rw:
 546         rc = jfs_umount(sb);
 547         if (rc) {
 548                 jfs_err("jfs_umount failed with return code %d", rc);
 549         }
 550 out_mount_failed:
 551         filemap_write_and_wait(sbi->direct_inode->i_mapping);
 552         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
 553         make_bad_inode(sbi->direct_inode);
 554         iput(sbi->direct_inode);
 555         sbi->direct_inode = NULL;
 556 out_unload:
 557         if (sbi->nls_tab)
 558                 unload_nls(sbi->nls_tab);
 559 out_kfree:
 560         kfree(sbi);
 561         return ret;
 562 }
 563
 564 static int jfs_freeze(struct super_block *sb)
 565 {
 566         struct jfs_sb_info *sbi = JFS_SBI(sb);
 567         struct jfs_log *log = sbi->log;
 568
 569         if (!(sb->s_flags & MS_RDONLY)) {
 570                 txQuiesce(sb);
 571                 lmLogShutdown(log);
 572                 updateSuper(sb, FM_CLEAN);
 573         }
 574         return 0;
 575 }
 576
 577 static int jfs_unfreeze(struct super_block *sb)
 578 {
 579         struct jfs_sb_info *sbi = JFS_SBI(sb);
 580         struct jfs_log *log = sbi->log;
 581         int rc = 0;
 582
 583         if (!(sb->s_flags & MS_RDONLY)) {
 584                 updateSuper(sb, FM_MOUNT);
 585                 if ((rc = lmLogInit(log)))
 586                         jfs_err("jfs_unlock failed with return code %d", rc);
 587                 else
 588                         txResume(sb);
 589         }
 590         return 0;
 591 }
 592
 593 static struct dentry *jfs_do_mount(struct file_system_type *fs_type,
 594         int flags, const char *dev_name, void *data)
 595 {
 596         return mount_bdev(fs_type, flags, dev_name, data, jfs_fill_super);
 597 }
 598
 599 static int jfs_sync_fs(struct super_block *sb, int wait)
 600 {
 601         struct jfs_log *log = JFS_SBI(sb)->log;
 602
 603         /* log == NULL indicates read-only mount */
 604         if (log) {
 605                 jfs_flush_journal(log, wait);
 606                 jfs_syncpt(log, 0);
 607         }
 608
 609         return 0;
 610 }
 611
 612 static int jfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
 613 {
 614         struct jfs_sb_info *sbi = JFS_SBI(vfs->mnt_sb);
 615
 616         if (sbi->uid != -1)
 617                 seq_printf(seq, ",uid=%d", sbi->uid);
 618         if (sbi->gid != -1)
 619                 seq_printf(seq, ",gid=%d", sbi->gid);
 620         if (sbi->umask != -1)
 621                 seq_printf(seq, ",umask=%03o", sbi->umask);
 622         if (sbi->flag & JFS_NOINTEGRITY)
 623                 seq_puts(seq, ",nointegrity");
 624         if (sbi->nls_tab)
 625                 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset);
 626         if (sbi->flag & JFS_ERR_CONTINUE)
 627                 seq_printf(seq, ",errors=continue");
 628         if (sbi->flag & JFS_ERR_PANIC)
 629                 seq_printf(seq, ",errors=panic");
 630
 631 #ifdef CONFIG_QUOTA
 632         if (sbi->flag & JFS_USRQUOTA)
 633                 seq_puts(seq, ",usrquota");
 634
 635         if (sbi->flag & JFS_GRPQUOTA)
 636                 seq_puts(seq, ",grpquota");
 637 #endif
 638
 639         return 0;
 640 }
 641
 642 #ifdef CONFIG_QUOTA
 643
 644 /* Read data from quotafile - avoid pagecache and such because we cannot afford
 645  * acquiring the locks... As quota files are never truncated and quota code
 646  * itself serializes the operations (and no one else should touch the files)
 647  * we don't have to be afraid of races */
 648 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
 649                               size_t len, loff_t off)
 650 {
 651         struct inode *inode = sb_dqopt(sb)->files[type];
 652         sector_t blk = off >> sb->s_blocksize_bits;
 653         int err = 0;
 654         int offset = off & (sb->s_blocksize - 1);
 655         int tocopy;
 656         size_t toread;
 657         struct buffer_head tmp_bh;
 658         struct buffer_head *bh;
 659         loff_t i_size = i_size_read(inode);
 660
 661         if (off > i_size)
 662                 return 0;
 663         if (off+len > i_size)
 664                 len = i_size-off;
 665         toread = len;
 666         while (toread > 0) {
 667                 tocopy = sb->s_blocksize - offset < toread ?
 668                                 sb->s_blocksize - offset : toread;
 669
 670                 tmp_bh.b_state = 0;
 671                 tmp_bh.b_size = 1 << inode->i_blkbits;
 672                 err = jfs_get_block(inode, blk, &tmp_bh, 0);
 673                 if (err)
 674                         return err;
 675                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
 676                         memset(data, 0, tocopy);
 677                 else {
 678                         bh = sb_bread(sb, tmp_bh.b_blocknr);
 679                         if (!bh)
 680                                 return -EIO;
 681                         memcpy(data, bh->b_data+offset, tocopy);
 682                         brelse(bh);
 683                 }
 684                 offset = 0;
 685                 toread -= tocopy;
 686                 data += tocopy;
 687                 blk++;
 688         }
 689         return len;
 690 }
 691
 692 /* Write to quotafile */
 693 static ssize_t jfs_quota_write(struct super_block *sb, int type,
 694                                const char *data, size_t len, loff_t off)
 695 {
 696         struct inode *inode = sb_dqopt(sb)->files[type];
 697         sector_t blk = off >> sb->s_blocksize_bits;
 698         int err = 0;
 699         int offset = off & (sb->s_blocksize - 1);
 700         int tocopy;
 701         size_t towrite = len;
 702         struct buffer_head tmp_bh;
 703         struct buffer_head *bh;
 704
 705         mutex_lock(&inode->i_mutex);
 706         while (towrite > 0) {
 707                 tocopy = sb->s_blocksize - offset < towrite ?
 708                                 sb->s_blocksize - offset : towrite;
 709
 710                 tmp_bh.b_state = 0;
 711                 tmp_bh.b_size = 1 << inode->i_blkbits;
 712                 err = jfs_get_block(inode, blk, &tmp_bh, 1);
 713                 if (err)
 714                         goto out;
 715                 if (offset || tocopy != sb->s_blocksize)
 716                         bh = sb_bread(sb, tmp_bh.b_blocknr);
 717                 else
 718                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
 719                 if (!bh) {
 720                         err = -EIO;
 721                         goto out;
 722                 }
 723                 lock_buffer(bh);
 724                 memcpy(bh->b_data+offset, data, tocopy);
 725                 flush_dcache_page(bh->b_page);
 726                 set_buffer_uptodate(bh);
 727                 mark_buffer_dirty(bh);
 728                 unlock_buffer(bh);
 729                 brelse(bh);
 730                 offset = 0;
 731                 towrite -= tocopy;
 732                 data += tocopy;
 733                 blk++;
 734         }
 735 out:
 736         if (len == towrite) {
 737                 mutex_unlock(&inode->i_mutex);
 738                 return err;
 739         }
 740         if (inode->i_size < off+len-towrite)
 741                 i_size_write(inode, off+len-towrite);
 742         inode->i_version++;
 743         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
 744         mark_inode_dirty(inode);
 745         mutex_unlock(&inode->i_mutex);
 746         return len - towrite;
 747 }
 748
 749 #endif
 750
 751 static const struct super_operations jfs_super_operations = {
 752         .alloc_inode    = jfs_alloc_inode,
 753         .destroy_inode  = jfs_destroy_inode,
 754         .dirty_inode    = jfs_dirty_inode,
 755         .write_inode    = jfs_write_inode,
 756         .evict_inode    = jfs_evict_inode,
 757         .put_super      = jfs_put_super,
 758         .sync_fs        = jfs_sync_fs,
 759         .freeze_fs      = jfs_freeze,
 760         .unfreeze_fs    = jfs_unfreeze,
 761         .statfs         = jfs_statfs,
 762         .remount_fs     = jfs_remount,
 763         .show_options   = jfs_show_options,
 764 #ifdef CONFIG_QUOTA
 765         .quota_read     = jfs_quota_read,
 766         .quota_write    = jfs_quota_write,
 767 #endif
 768 };
 769
 770 static const struct export_operations jfs_export_operations = {
 771         .fh_to_dentry   = jfs_fh_to_dentry,
 772         .fh_to_parent   = jfs_fh_to_parent,
 773         .get_parent     = jfs_get_parent,
 774 };
 775
 776 static struct file_system_type jfs_fs_type = {
 777         .owner          = THIS_MODULE,
 778         .name           = "jfs",
 779         .mount          = jfs_do_mount,
 780         .kill_sb        = kill_block_super,
 781         .fs_flags       = FS_REQUIRES_DEV,
 782 };
 783
 784 static void init_once(void *foo)
 785 {
 786         struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
 787
 788         memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
 789         INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
 790         init_rwsem(&jfs_ip->rdwrlock);
 791         mutex_init(&jfs_ip->commit_mutex);
 792         init_rwsem(&jfs_ip->xattr_sem);
 793         spin_lock_init(&jfs_ip->ag_lock);
 794         jfs_ip->active_ag = -1;
 795         inode_init_once(&jfs_ip->vfs_inode);
 796 }
 797
 798 static int __init init_jfs_fs(void)
 799 {
 800         int i;
 801         int rc;
 802
 803         jfs_inode_cachep =
 804             kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
 805                             SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
 806                             init_once);
 807         if (jfs_inode_cachep == NULL)
 808                 return -ENOMEM;
 809
 810         /*
 811          * Metapage initialization
 812          */
 813         rc = metapage_init();
 814         if (rc) {
 815                 jfs_err("metapage_init failed w/rc = %d", rc);
 816                 goto free_slab;
 817         }
 818
 819         /*
 820          * Transaction Manager initialization
 821          */
 822         rc = txInit();
 823         if (rc) {
 824                 jfs_err("txInit failed w/rc = %d", rc);
 825                 goto free_metapage;
 826         }
 827
 828         /*
 829          * I/O completion thread (endio)
 830          */
 831         jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
 832         if (IS_ERR(jfsIOthread)) {
 833                 rc = PTR_ERR(jfsIOthread);
 834                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
 835                 goto end_txmngr;
 836         }
 837
 838         if (commit_threads < 1)
 839                 commit_threads = num_online_cpus();
 840         if (commit_threads > MAX_COMMIT_THREADS)
 841                 commit_threads = MAX_COMMIT_THREADS;
 842
 843         for (i = 0; i < commit_threads; i++) {
 844                 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, "jfsCommit");
 845                 if (IS_ERR(jfsCommitThread[i])) {
 846                         rc = PTR_ERR(jfsCommitThread[i]);
 847                         jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
 848                         commit_threads = i;
 849                         goto kill_committask;
 850                 }
 851         }
 852
 853         jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
 854         if (IS_ERR(jfsSyncThread)) {
 855                 rc = PTR_ERR(jfsSyncThread);
 856                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
 857                 goto kill_committask;
 858         }
 859
 860 #ifdef PROC_FS_JFS
 861         jfs_proc_init();
 862 #endif
 863
 864         return register_filesystem(&jfs_fs_type);
 865
 866 kill_committask:
 867         for (i = 0; i < commit_threads; i++)
 868                 kthread_stop(jfsCommitThread[i]);
 869         kthread_stop(jfsIOthread);
 870 end_txmngr:
 871         txExit();
 872 free_metapage:
 873         metapage_exit();
 874 free_slab:
 875         kmem_cache_destroy(jfs_inode_cachep);
 876         return rc;
 877 }
 878
 879 static void __exit exit_jfs_fs(void)
 880 {
 881         int i;
 882
 883         jfs_info("exit_jfs_fs called");
 884
 885         txExit();
 886         metapage_exit();
 887
 888         kthread_stop(jfsIOthread);
 889         for (i = 0; i < commit_threads; i++)
 890                 kthread_stop(jfsCommitThread[i]);
 891         kthread_stop(jfsSyncThread);
 892 #ifdef PROC_FS_JFS
 893         jfs_proc_clean();
 894 #endif
 895         unregister_filesystem(&jfs_fs_type);
 896         kmem_cache_destroy(jfs_inode_cachep);
 897 }
 898
 899 module_init(init_jfs_fs)
 900 module_exit(exit_jfs_fs)