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/blkdev.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 #include "jfs_xattr.h"
  48
  49 MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
  50 MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
  51 MODULE_LICENSE("GPL");
  52
  53 static struct kmem_cache * jfs_inode_cachep;
  54
  55 static const struct super_operations jfs_super_operations;
  56 static const struct export_operations jfs_export_operations;
  57 static struct file_system_type jfs_fs_type;
  58
  59 #define MAX_COMMIT_THREADS 64
  60 static int commit_threads = 0;
  61 module_param(commit_threads, int, 0);
  62 MODULE_PARM_DESC(commit_threads, "Number of commit threads");
  63
  64 static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS];
  65 struct task_struct *jfsIOthread;
  66 struct task_struct *jfsSyncThread;
  67
  68 #ifdef CONFIG_JFS_DEBUG
  69 int jfsloglevel = JFS_LOGLEVEL_WARN;
  70 module_param(jfsloglevel, int, 0644);
  71 MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
  72 #endif
  73
  74 static void jfs_handle_error(struct super_block *sb)
  75 {
  76         struct jfs_sb_info *sbi = JFS_SBI(sb);
  77
  78         if (sb->s_flags & MS_RDONLY)
  79                 return;
  80
  81         updateSuper(sb, FM_DIRTY);
  82
  83         if (sbi->flag & JFS_ERR_PANIC)
  84                 panic("JFS (device %s): panic forced after error\n",
  85                         sb->s_id);
  86         else if (sbi->flag & JFS_ERR_REMOUNT_RO) {
  87                 jfs_err("ERROR: (device %s): remounting filesystem "
  88                         "as read-only\n",
  89                         sb->s_id);
  90                 sb->s_flags |= MS_RDONLY;
  91         }
  92
  93         /* nothing is done for continue beyond marking the superblock dirty */
  94 }
  95
  96 void jfs_error(struct super_block *sb, const char *fmt, ...)
  97 {
  98         struct va_format vaf;
  99         va_list args;
 100
 101         va_start(args, fmt);
 102
 103         vaf.fmt = fmt;
 104         vaf.va = &args;
 105
 106         pr_err("ERROR: (device %s): %pf: %pV\n",
 107                sb->s_id, __builtin_return_address(0), &vaf);
 108
 109         va_end(args);
 110
 111         jfs_handle_error(sb);
 112 }
 113
 114 static struct inode *jfs_alloc_inode(struct super_block *sb)
 115 {
 116         struct jfs_inode_info *jfs_inode;
 117
 118         jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS);
 119         if (!jfs_inode)
 120                 return NULL;
 121         return &jfs_inode->vfs_inode;
 122 }
 123
 124 static void jfs_i_callback(struct rcu_head *head)
 125 {
 126         struct inode *inode = container_of(head, struct inode, i_rcu);
 127         struct jfs_inode_info *ji = JFS_IP(inode);
 128         kmem_cache_free(jfs_inode_cachep, ji);
 129 }
 130
 131 static void jfs_destroy_inode(struct inode *inode)
 132 {
 133         struct jfs_inode_info *ji = JFS_IP(inode);
 134
 135         BUG_ON(!list_empty(&ji->anon_inode_list));
 136
 137         spin_lock_irq(&ji->ag_lock);
 138         if (ji->active_ag != -1) {
 139                 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
 140                 atomic_dec(&bmap->db_active[ji->active_ag]);
 141                 ji->active_ag = -1;
 142         }
 143         spin_unlock_irq(&ji->ag_lock);
 144         call_rcu(&inode->i_rcu, jfs_i_callback);
 145 }
 146
 147 static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 148 {
 149         struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb);
 150         s64 maxinodes;
 151         struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
 152
 153         jfs_info("In jfs_statfs");
 154         buf->f_type = JFS_SUPER_MAGIC;
 155         buf->f_bsize = sbi->bsize;
 156         buf->f_blocks = sbi->bmap->db_mapsize;
 157         buf->f_bfree = sbi->bmap->db_nfree;
 158         buf->f_bavail = sbi->bmap->db_nfree;
 159         /*
 160          * If we really return the number of allocated & free inodes, some
 161          * applications will fail because they won't see enough free inodes.
 162          * We'll try to calculate some guess as to how many inodes we can
 163          * really allocate
 164          *
 165          * buf->f_files = atomic_read(&imap->im_numinos);
 166          * buf->f_ffree = atomic_read(&imap->im_numfree);
 167          */
 168         maxinodes = min((s64) atomic_read(&imap->im_numinos) +
 169                         ((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
 170                          << L2INOSPEREXT), (s64) 0xffffffffLL);
 171         buf->f_files = maxinodes;
 172         buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
 173                                     atomic_read(&imap->im_numfree));
 174         buf->f_fsid.val[0] = (u32)crc32_le(0, sbi->uuid, sizeof(sbi->uuid)/2);
 175         buf->f_fsid.val[1] = (u32)crc32_le(0, sbi->uuid + sizeof(sbi->uuid)/2,
 176                                         sizeof(sbi->uuid)/2);
 177
 178         buf->f_namelen = JFS_NAME_MAX;
 179         return 0;
 180 }
 181
 182 static void jfs_put_super(struct super_block *sb)
 183 {
 184         struct jfs_sb_info *sbi = JFS_SBI(sb);
 185         int rc;
 186
 187         jfs_info("In jfs_put_super");
 188
 189         dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
 190
 191         rc = jfs_umount(sb);
 192         if (rc)
 193                 jfs_err("jfs_umount failed with return code %d", rc);
 194
 195         unload_nls(sbi->nls_tab);
 196
 197         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
 198         iput(sbi->direct_inode);
 199
 200         kfree(sbi);
 201 }
 202
 203 enum {
 204         Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
 205         Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota,
 206         Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask,
 207         Opt_discard, Opt_nodiscard, Opt_discard_minblk
 208 };
 209
 210 static const match_table_t tokens = {
 211         {Opt_integrity, "integrity"},
 212         {Opt_nointegrity, "nointegrity"},
 213         {Opt_iocharset, "iocharset=%s"},
 214         {Opt_resize, "resize=%u"},
 215         {Opt_resize_nosize, "resize"},
 216         {Opt_errors, "errors=%s"},
 217         {Opt_ignore, "noquota"},
 218         {Opt_ignore, "quota"},
 219         {Opt_usrquota, "usrquota"},
 220         {Opt_grpquota, "grpquota"},
 221         {Opt_uid, "uid=%u"},
 222         {Opt_gid, "gid=%u"},
 223         {Opt_umask, "umask=%u"},
 224         {Opt_discard, "discard"},
 225         {Opt_nodiscard, "nodiscard"},
 226         {Opt_discard_minblk, "discard=%u"},
 227         {Opt_err, NULL}
 228 };
 229
 230 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
 231                          int *flag)
 232 {
 233         void *nls_map = (void *)-1;     /* -1: no change;  NULL: none */
 234         char *p;
 235         struct jfs_sb_info *sbi = JFS_SBI(sb);
 236
 237         *newLVSize = 0;
 238
 239         if (!options)
 240                 return 1;
 241
 242         while ((p = strsep(&options, ",")) != NULL) {
 243                 substring_t args[MAX_OPT_ARGS];
 244                 int token;
 245                 if (!*p)
 246                         continue;
 247
 248                 token = match_token(p, tokens, args);
 249                 switch (token) {
 250                 case Opt_integrity:
 251                         *flag &= ~JFS_NOINTEGRITY;
 252                         break;
 253                 case Opt_nointegrity:
 254                         *flag |= JFS_NOINTEGRITY;
 255                         break;
 256                 case Opt_ignore:
 257                         /* Silently ignore the quota options */
 258                         /* Don't do anything ;-) */
 259                         break;
 260                 case Opt_iocharset:
 261                         if (nls_map && nls_map != (void *) -1)
 262                                 unload_nls(nls_map);
 263                         if (!strcmp(args[0].from, "none"))
 264                                 nls_map = NULL;
 265                         else {
 266                                 nls_map = load_nls(args[0].from);
 267                                 if (!nls_map) {
 268                                         pr_err("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                                 pr_err("JFS: Cannot determine volume size\n");
 285                         break;
 286                 }
 287                 case Opt_errors:
 288                 {
 289                         char *errors = args[0].from;
 290                         if (!errors || !*errors)
 291                                 goto cleanup;
 292                         if (!strcmp(errors, "continue")) {
 293                                 *flag &= ~JFS_ERR_REMOUNT_RO;
 294                                 *flag &= ~JFS_ERR_PANIC;
 295                                 *flag |= JFS_ERR_CONTINUE;
 296                         } else if (!strcmp(errors, "remount-ro")) {
 297                                 *flag &= ~JFS_ERR_CONTINUE;
 298                                 *flag &= ~JFS_ERR_PANIC;
 299                                 *flag |= JFS_ERR_REMOUNT_RO;
 300                         } else if (!strcmp(errors, "panic")) {
 301                                 *flag &= ~JFS_ERR_CONTINUE;
 302                                 *flag &= ~JFS_ERR_REMOUNT_RO;
 303                                 *flag |= JFS_ERR_PANIC;
 304                         } else {
 305                                 pr_err("JFS: %s is an invalid error handler\n",
 306                                        errors);
 307                                 goto cleanup;
 308                         }
 309                         break;
 310                 }
 311
 312 #ifdef CONFIG_QUOTA
 313                 case Opt_quota:
 314                 case Opt_usrquota:
 315                         *flag |= JFS_USRQUOTA;
 316                         break;
 317                 case Opt_grpquota:
 318                         *flag |= JFS_GRPQUOTA;
 319                         break;
 320 #else
 321                 case Opt_usrquota:
 322                 case Opt_grpquota:
 323                 case Opt_quota:
 324                         pr_err("JFS: quota operations not supported\n");
 325                         break;
 326 #endif
 327                 case Opt_uid:
 328                 {
 329                         char *uid = args[0].from;
 330                         uid_t val = simple_strtoul(uid, &uid, 0);
 331                         sbi->uid = make_kuid(current_user_ns(), val);
 332                         if (!uid_valid(sbi->uid))
 333                                 goto cleanup;
 334                         break;
 335                 }
 336
 337                 case Opt_gid:
 338                 {
 339                         char *gid = args[0].from;
 340                         gid_t val = simple_strtoul(gid, &gid, 0);
 341                         sbi->gid = make_kgid(current_user_ns(), val);
 342                         if (!gid_valid(sbi->gid))
 343                                 goto cleanup;
 344                         break;
 345                 }
 346
 347                 case Opt_umask:
 348                 {
 349                         char *umask = args[0].from;
 350                         sbi->umask = simple_strtoul(umask, &umask, 8);
 351                         if (sbi->umask & ~0777) {
 352                                 pr_err("JFS: Invalid value of umask\n");
 353                                 goto cleanup;
 354                         }
 355                         break;
 356                 }
 357
 358                 case Opt_discard:
 359                 {
 360                         struct request_queue *q = bdev_get_queue(sb->s_bdev);
 361                         /* if set to 1, even copying files will cause
 362                          * trimming :O
 363                          * -> user has more control over the online trimming
 364                          */
 365                         sbi->minblks_trim = 64;
 366                         if (blk_queue_discard(q)) {
 367                                 *flag |= JFS_DISCARD;
 368                         } else {
 369                                 pr_err("JFS: discard option " \
 370                                         "not supported on device\n");
 371                         }
 372                         break;
 373                 }
 374
 375                 case Opt_nodiscard:
 376                         *flag &= ~JFS_DISCARD;
 377                         break;
 378
 379                 case Opt_discard_minblk:
 380                 {
 381                         struct request_queue *q = bdev_get_queue(sb->s_bdev);
 382                         char *minblks_trim = args[0].from;
 383                         if (blk_queue_discard(q)) {
 384                                 *flag |= JFS_DISCARD;
 385                                 sbi->minblks_trim = simple_strtoull(
 386                                         minblks_trim, &minblks_trim, 0);
 387                         } else {
 388                                 pr_err("JFS: discard option " \
 389                                         "not supported on device\n");
 390                         }
 391                         break;
 392                 }
 393
 394                 default:
 395                         printk("jfs: Unrecognized mount option \"%s\" "
 396                                         " or missing value\n", p);
 397                         goto cleanup;
 398                 }
 399         }
 400
 401         if (nls_map != (void *) -1) {
 402                 /* Discard old (if remount) */
 403                 unload_nls(sbi->nls_tab);
 404                 sbi->nls_tab = nls_map;
 405         }
 406         return 1;
 407
 408 cleanup:
 409         if (nls_map && nls_map != (void *) -1)
 410                 unload_nls(nls_map);
 411         return 0;
 412 }
 413
 414 static int jfs_remount(struct super_block *sb, int *flags, char *data)
 415 {
 416         s64 newLVSize = 0;
 417         int rc = 0;
 418         int flag = JFS_SBI(sb)->flag;
 419         int ret;
 420
 421         sync_filesystem(sb);
 422         if (!parse_options(data, sb, &newLVSize, &flag)) {
 423                 return -EINVAL;
 424         }
 425
 426         if (newLVSize) {
 427                 if (sb->s_flags & MS_RDONLY) {
 428                         pr_err("JFS: resize requires volume" \
 429                                 " to be mounted read-write\n");
 430                         return -EROFS;
 431                 }
 432                 rc = jfs_extendfs(sb, newLVSize, 0);
 433                 if (rc)
 434                         return rc;
 435         }
 436
 437         if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
 438                 /*
 439                  * Invalidate any previously read metadata.  fsck may have
 440                  * changed the on-disk data since we mounted r/o
 441                  */
 442                 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
 443
 444                 JFS_SBI(sb)->flag = flag;
 445                 ret = jfs_mount_rw(sb, 1);
 446
 447                 /* mark the fs r/w for quota activity */
 448                 sb->s_flags &= ~MS_RDONLY;
 449
 450                 dquot_resume(sb, -1);
 451                 return ret;
 452         }
 453         if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
 454                 rc = dquot_suspend(sb, -1);
 455                 if (rc < 0) {
 456                         return rc;
 457                 }
 458                 rc = jfs_umount_rw(sb);
 459                 JFS_SBI(sb)->flag = flag;
 460                 return rc;
 461         }
 462         if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
 463                 if (!(sb->s_flags & MS_RDONLY)) {
 464                         rc = jfs_umount_rw(sb);
 465                         if (rc)
 466                                 return rc;
 467
 468                         JFS_SBI(sb)->flag = flag;
 469                         ret = jfs_mount_rw(sb, 1);
 470                         return ret;
 471                 }
 472         JFS_SBI(sb)->flag = flag;
 473
 474         return 0;
 475 }
 476
 477 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
 478 {
 479         struct jfs_sb_info *sbi;
 480         struct inode *inode;
 481         int rc;
 482         s64 newLVSize = 0;
 483         int flag, ret = -EINVAL;
 484
 485         jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
 486
 487         if (!new_valid_dev(sb->s_bdev->bd_dev))
 488                 return -EOVERFLOW;
 489
 490         sbi = kzalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
 491         if (!sbi)
 492                 return -ENOMEM;
 493
 494         sb->s_fs_info = sbi;
 495         sb->s_max_links = JFS_LINK_MAX;
 496         sbi->sb = sb;
 497         sbi->uid = INVALID_UID;
 498         sbi->gid = INVALID_GID;
 499         sbi->umask = -1;
 500
 501         /* initialize the mount flag and determine the default error handler */
 502         flag = JFS_ERR_REMOUNT_RO;
 503
 504         if (!parse_options((char *) data, sb, &newLVSize, &flag))
 505                 goto out_kfree;
 506         sbi->flag = flag;
 507
 508 #ifdef CONFIG_JFS_POSIX_ACL
 509         sb->s_flags |= MS_POSIXACL;
 510 #endif
 511
 512         if (newLVSize) {
 513                 pr_err("resize option for remount only\n");
 514                 goto out_kfree;
 515         }
 516
 517         /*
 518          * Initialize blocksize to 4K.
 519          */
 520         sb_set_blocksize(sb, PSIZE);
 521
 522         /*
 523          * Set method vectors.
 524          */
 525         sb->s_op = &jfs_super_operations;
 526         sb->s_export_op = &jfs_export_operations;
 527         sb->s_xattr = jfs_xattr_handlers;
 528 #ifdef CONFIG_QUOTA
 529         sb->dq_op = &dquot_operations;
 530         sb->s_qcop = &dquot_quotactl_ops;
 531 #endif
 532
 533         /*
 534          * Initialize direct-mapping inode/address-space
 535          */
 536         inode = new_inode(sb);
 537         if (inode == NULL) {
 538                 ret = -ENOMEM;
 539                 goto out_unload;
 540         }
 541         inode->i_ino = 0;
 542         inode->i_size = sb->s_bdev->bd_inode->i_size;
 543         inode->i_mapping->a_ops = &jfs_metapage_aops;
 544         insert_inode_hash(inode);
 545         mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
 546
 547         sbi->direct_inode = inode;
 548
 549         rc = jfs_mount(sb);
 550         if (rc) {
 551                 if (!silent) {
 552                         jfs_err("jfs_mount failed w/return code = %d", rc);
 553                 }
 554                 goto out_mount_failed;
 555         }
 556         if (sb->s_flags & MS_RDONLY)
 557                 sbi->log = NULL;
 558         else {
 559                 rc = jfs_mount_rw(sb, 0);
 560                 if (rc) {
 561                         if (!silent) {
 562                                 jfs_err("jfs_mount_rw failed, return code = %d",
 563                                         rc);
 564                         }
 565                         goto out_no_rw;
 566                 }
 567         }
 568
 569         sb->s_magic = JFS_SUPER_MAGIC;
 570
 571         if (sbi->mntflag & JFS_OS2)
 572                 sb->s_d_op = &jfs_ci_dentry_operations;
 573
 574         inode = jfs_iget(sb, ROOT_I);
 575         if (IS_ERR(inode)) {
 576                 ret = PTR_ERR(inode);
 577                 goto out_no_rw;
 578         }
 579         sb->s_root = d_make_root(inode);
 580         if (!sb->s_root)
 581                 goto out_no_root;
 582
 583         /* logical blocks are represented by 40 bits in pxd_t, etc. */
 584         sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
 585 #if BITS_PER_LONG == 32
 586         /*
 587          * Page cache is indexed by long.
 588          * I would use MAX_LFS_FILESIZE, but it's only half as big
 589          */
 590         sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, (u64)sb->s_maxbytes);
 591 #endif
 592         sb->s_time_gran = 1;
 593         return 0;
 594
 595 out_no_root:
 596         jfs_err("jfs_read_super: get root dentry failed");
 597
 598 out_no_rw:
 599         rc = jfs_umount(sb);
 600         if (rc) {
 601                 jfs_err("jfs_umount failed with return code %d", rc);
 602         }
 603 out_mount_failed:
 604         filemap_write_and_wait(sbi->direct_inode->i_mapping);
 605         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
 606         make_bad_inode(sbi->direct_inode);
 607         iput(sbi->direct_inode);
 608         sbi->direct_inode = NULL;
 609 out_unload:
 610         if (sbi->nls_tab)
 611                 unload_nls(sbi->nls_tab);
 612 out_kfree:
 613         kfree(sbi);
 614         return ret;
 615 }
 616
 617 static int jfs_freeze(struct super_block *sb)
 618 {
 619         struct jfs_sb_info *sbi = JFS_SBI(sb);
 620         struct jfs_log *log = sbi->log;
 621         int rc = 0;
 622
 623         if (!(sb->s_flags & MS_RDONLY)) {
 624                 txQuiesce(sb);
 625                 rc = lmLogShutdown(log);
 626                 if (rc) {
 627                         jfs_error(sb, "lmLogShutdown failed\n");
 628
 629                         /* let operations fail rather than hang */
 630                         txResume(sb);
 631
 632                         return rc;
 633                 }
 634                 rc = updateSuper(sb, FM_CLEAN);
 635                 if (rc) {
 636                         jfs_err("jfs_freeze: updateSuper failed\n");
 637                         /*
 638                          * Don't fail here. Everything succeeded except
 639                          * marking the superblock clean, so there's really
 640                          * no harm in leaving it frozen for now.
 641                          */
 642                 }
 643         }
 644         return 0;
 645 }
 646
 647 static int jfs_unfreeze(struct super_block *sb)
 648 {
 649         struct jfs_sb_info *sbi = JFS_SBI(sb);
 650         struct jfs_log *log = sbi->log;
 651         int rc = 0;
 652
 653         if (!(sb->s_flags & MS_RDONLY)) {
 654                 rc = updateSuper(sb, FM_MOUNT);
 655                 if (rc) {
 656                         jfs_error(sb, "updateSuper failed\n");
 657                         goto out;
 658                 }
 659                 rc = lmLogInit(log);
 660                 if (rc)
 661                         jfs_error(sb, "lmLogInit failed\n");
 662 out:
 663                 txResume(sb);
 664         }
 665         return rc;
 666 }
 667
 668 static struct dentry *jfs_do_mount(struct file_system_type *fs_type,
 669         int flags, const char *dev_name, void *data)
 670 {
 671         return mount_bdev(fs_type, flags, dev_name, data, jfs_fill_super);
 672 }
 673
 674 static int jfs_sync_fs(struct super_block *sb, int wait)
 675 {
 676         struct jfs_log *log = JFS_SBI(sb)->log;
 677
 678         /* log == NULL indicates read-only mount */
 679         if (log) {
 680                 /*
 681                  * Write quota structures to quota file, sync_blockdev() will
 682                  * write them to disk later
 683                  */
 684                 dquot_writeback_dquots(sb, -1);
 685                 jfs_flush_journal(log, wait);
 686                 jfs_syncpt(log, 0);
 687         }
 688
 689         return 0;
 690 }
 691
 692 static int jfs_show_options(struct seq_file *seq, struct dentry *root)
 693 {
 694         struct jfs_sb_info *sbi = JFS_SBI(root->d_sb);
 695
 696         if (uid_valid(sbi->uid))
 697                 seq_printf(seq, ",uid=%d", from_kuid(&init_user_ns, sbi->uid));
 698         if (gid_valid(sbi->gid))
 699                 seq_printf(seq, ",gid=%d", from_kgid(&init_user_ns, sbi->gid));
 700         if (sbi->umask != -1)
 701                 seq_printf(seq, ",umask=%03o", sbi->umask);
 702         if (sbi->flag & JFS_NOINTEGRITY)
 703                 seq_puts(seq, ",nointegrity");
 704         if (sbi->flag & JFS_DISCARD)
 705                 seq_printf(seq, ",discard=%u", sbi->minblks_trim);
 706         if (sbi->nls_tab)
 707                 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset);
 708         if (sbi->flag & JFS_ERR_CONTINUE)
 709                 seq_printf(seq, ",errors=continue");
 710         if (sbi->flag & JFS_ERR_PANIC)
 711                 seq_printf(seq, ",errors=panic");
 712
 713 #ifdef CONFIG_QUOTA
 714         if (sbi->flag & JFS_USRQUOTA)
 715                 seq_puts(seq, ",usrquota");
 716
 717         if (sbi->flag & JFS_GRPQUOTA)
 718                 seq_puts(seq, ",grpquota");
 719 #endif
 720
 721         return 0;
 722 }
 723
 724 #ifdef CONFIG_QUOTA
 725
 726 /* Read data from quotafile - avoid pagecache and such because we cannot afford
 727  * acquiring the locks... As quota files are never truncated and quota code
 728  * itself serializes the operations (and no one else should touch the files)
 729  * we don't have to be afraid of races */
 730 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
 731                               size_t len, loff_t off)
 732 {
 733         struct inode *inode = sb_dqopt(sb)->files[type];
 734         sector_t blk = off >> sb->s_blocksize_bits;
 735         int err = 0;
 736         int offset = off & (sb->s_blocksize - 1);
 737         int tocopy;
 738         size_t toread;
 739         struct buffer_head tmp_bh;
 740         struct buffer_head *bh;
 741         loff_t i_size = i_size_read(inode);
 742
 743         if (off > i_size)
 744                 return 0;
 745         if (off+len > i_size)
 746                 len = i_size-off;
 747         toread = len;
 748         while (toread > 0) {
 749                 tocopy = sb->s_blocksize - offset < toread ?
 750                                 sb->s_blocksize - offset : toread;
 751
 752                 tmp_bh.b_state = 0;
 753                 tmp_bh.b_size = 1 << inode->i_blkbits;
 754                 err = jfs_get_block(inode, blk, &tmp_bh, 0);
 755                 if (err)
 756                         return err;
 757                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
 758                         memset(data, 0, tocopy);
 759                 else {
 760                         bh = sb_bread(sb, tmp_bh.b_blocknr);
 761                         if (!bh)
 762                                 return -EIO;
 763                         memcpy(data, bh->b_data+offset, tocopy);
 764                         brelse(bh);
 765                 }
 766                 offset = 0;
 767                 toread -= tocopy;
 768                 data += tocopy;
 769                 blk++;
 770         }
 771         return len;
 772 }
 773
 774 /* Write to quotafile */
 775 static ssize_t jfs_quota_write(struct super_block *sb, int type,
 776                                const char *data, size_t len, loff_t off)
 777 {
 778         struct inode *inode = sb_dqopt(sb)->files[type];
 779         sector_t blk = off >> sb->s_blocksize_bits;
 780         int err = 0;
 781         int offset = off & (sb->s_blocksize - 1);
 782         int tocopy;
 783         size_t towrite = len;
 784         struct buffer_head tmp_bh;
 785         struct buffer_head *bh;
 786
 787         mutex_lock(&inode->i_mutex);
 788         while (towrite > 0) {
 789                 tocopy = sb->s_blocksize - offset < towrite ?
 790                                 sb->s_blocksize - offset : towrite;
 791
 792                 tmp_bh.b_state = 0;
 793                 tmp_bh.b_size = 1 << inode->i_blkbits;
 794                 err = jfs_get_block(inode, blk, &tmp_bh, 1);
 795                 if (err)
 796                         goto out;
 797                 if (offset || tocopy != sb->s_blocksize)
 798                         bh = sb_bread(sb, tmp_bh.b_blocknr);
 799                 else
 800                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
 801                 if (!bh) {
 802                         err = -EIO;
 803                         goto out;
 804                 }
 805                 lock_buffer(bh);
 806                 memcpy(bh->b_data+offset, data, tocopy);
 807                 flush_dcache_page(bh->b_page);
 808                 set_buffer_uptodate(bh);
 809                 mark_buffer_dirty(bh);
 810                 unlock_buffer(bh);
 811                 brelse(bh);
 812                 offset = 0;
 813                 towrite -= tocopy;
 814                 data += tocopy;
 815                 blk++;
 816         }
 817 out:
 818         if (len == towrite) {
 819                 mutex_unlock(&inode->i_mutex);
 820                 return err;
 821         }
 822         if (inode->i_size < off+len-towrite)
 823                 i_size_write(inode, off+len-towrite);
 824         inode->i_version++;
 825         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
 826         mark_inode_dirty(inode);
 827         mutex_unlock(&inode->i_mutex);
 828         return len - towrite;
 829 }
 830
 831 #endif
 832
 833 static const struct super_operations jfs_super_operations = {
 834         .alloc_inode    = jfs_alloc_inode,
 835         .destroy_inode  = jfs_destroy_inode,
 836         .dirty_inode    = jfs_dirty_inode,
 837         .write_inode    = jfs_write_inode,
 838         .evict_inode    = jfs_evict_inode,
 839         .put_super      = jfs_put_super,
 840         .sync_fs        = jfs_sync_fs,
 841         .freeze_fs      = jfs_freeze,
 842         .unfreeze_fs    = jfs_unfreeze,
 843         .statfs         = jfs_statfs,
 844         .remount_fs     = jfs_remount,
 845         .show_options   = jfs_show_options,
 846 #ifdef CONFIG_QUOTA
 847         .quota_read     = jfs_quota_read,
 848         .quota_write    = jfs_quota_write,
 849 #endif
 850 };
 851
 852 static const struct export_operations jfs_export_operations = {
 853         .fh_to_dentry   = jfs_fh_to_dentry,
 854         .fh_to_parent   = jfs_fh_to_parent,
 855         .get_parent     = jfs_get_parent,
 856 };
 857
 858 static struct file_system_type jfs_fs_type = {
 859         .owner          = THIS_MODULE,
 860         .name           = "jfs",
 861         .mount          = jfs_do_mount,
 862         .kill_sb        = kill_block_super,
 863         .fs_flags       = FS_REQUIRES_DEV,
 864 };
 865 MODULE_ALIAS_FS("jfs");
 866
 867 static void init_once(void *foo)
 868 {
 869         struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
 870
 871         memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
 872         INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
 873         init_rwsem(&jfs_ip->rdwrlock);
 874         mutex_init(&jfs_ip->commit_mutex);
 875         init_rwsem(&jfs_ip->xattr_sem);
 876         spin_lock_init(&jfs_ip->ag_lock);
 877         jfs_ip->active_ag = -1;
 878         inode_init_once(&jfs_ip->vfs_inode);
 879 }
 880
 881 static int __init init_jfs_fs(void)
 882 {
 883         int i;
 884         int rc;
 885
 886         jfs_inode_cachep =
 887             kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
 888                             SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
 889                             init_once);
 890         if (jfs_inode_cachep == NULL)
 891                 return -ENOMEM;
 892
 893         /*
 894          * Metapage initialization
 895          */
 896         rc = metapage_init();
 897         if (rc) {
 898                 jfs_err("metapage_init failed w/rc = %d", rc);
 899                 goto free_slab;
 900         }
 901
 902         /*
 903          * Transaction Manager initialization
 904          */
 905         rc = txInit();
 906         if (rc) {
 907                 jfs_err("txInit failed w/rc = %d", rc);
 908                 goto free_metapage;
 909         }
 910
 911         /*
 912          * I/O completion thread (endio)
 913          */
 914         jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
 915         if (IS_ERR(jfsIOthread)) {
 916                 rc = PTR_ERR(jfsIOthread);
 917                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
 918                 goto end_txmngr;
 919         }
 920
 921         if (commit_threads < 1)
 922                 commit_threads = num_online_cpus();
 923         if (commit_threads > MAX_COMMIT_THREADS)
 924                 commit_threads = MAX_COMMIT_THREADS;
 925
 926         for (i = 0; i < commit_threads; i++) {
 927                 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, "jfsCommit");
 928                 if (IS_ERR(jfsCommitThread[i])) {
 929                         rc = PTR_ERR(jfsCommitThread[i]);
 930                         jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
 931                         commit_threads = i;
 932                         goto kill_committask;
 933                 }
 934         }
 935
 936         jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
 937         if (IS_ERR(jfsSyncThread)) {
 938                 rc = PTR_ERR(jfsSyncThread);
 939                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
 940                 goto kill_committask;
 941         }
 942
 943 #ifdef PROC_FS_JFS
 944         jfs_proc_init();
 945 #endif
 946
 947         rc = register_filesystem(&jfs_fs_type);
 948         if (!rc)
 949                 return 0;
 950
 951 #ifdef PROC_FS_JFS
 952         jfs_proc_clean();
 953 #endif
 954         kthread_stop(jfsSyncThread);
 955 kill_committask:
 956         for (i = 0; i < commit_threads; i++)
 957                 kthread_stop(jfsCommitThread[i]);
 958         kthread_stop(jfsIOthread);
 959 end_txmngr:
 960         txExit();
 961 free_metapage:
 962         metapage_exit();
 963 free_slab:
 964         kmem_cache_destroy(jfs_inode_cachep);
 965         return rc;
 966 }
 967
 968 static void __exit exit_jfs_fs(void)
 969 {
 970         int i;
 971
 972         jfs_info("exit_jfs_fs called");
 973
 974         txExit();
 975         metapage_exit();
 976
 977         kthread_stop(jfsIOthread);
 978         for (i = 0; i < commit_threads; i++)
 979                 kthread_stop(jfsCommitThread[i]);
 980         kthread_stop(jfsSyncThread);
 981 #ifdef PROC_FS_JFS
 982         jfs_proc_clean();
 983 #endif
 984         unregister_filesystem(&jfs_fs_type);
 985
 986         /*
 987          * Make sure all delayed rcu free inodes are flushed before we
 988          * destroy cache.
 989          */
 990         rcu_barrier();
 991         kmem_cache_destroy(jfs_inode_cachep);
 992 }
 993
 994 module_init(init_jfs_fs)
 995 module_exit(exit_jfs_fs)