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
  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         pr_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_i_callback(struct rcu_head *head)
 120 {
 121         struct inode *inode = container_of(head, struct inode, i_rcu);
 122         struct jfs_inode_info *ji = JFS_IP(inode);
 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 many 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         Opt_discard, Opt_nodiscard, Opt_discard_minblk
 203 };
 204
 205 static const match_table_t tokens = {
 206         {Opt_integrity, "integrity"},
 207         {Opt_nointegrity, "nointegrity"},
 208         {Opt_iocharset, "iocharset=%s"},
 209         {Opt_resize, "resize=%u"},
 210         {Opt_resize_nosize, "resize"},
 211         {Opt_errors, "errors=%s"},
 212         {Opt_ignore, "noquota"},
 213         {Opt_ignore, "quota"},
 214         {Opt_usrquota, "usrquota"},
 215         {Opt_grpquota, "grpquota"},
 216         {Opt_uid, "uid=%u"},
 217         {Opt_gid, "gid=%u"},
 218         {Opt_umask, "umask=%u"},
 219         {Opt_discard, "discard"},
 220         {Opt_nodiscard, "nodiscard"},
 221         {Opt_discard_minblk, "discard=%u"},
 222         {Opt_err, NULL}
 223 };
 224
 225 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
 226                          int *flag)
 227 {
 228         void *nls_map = (void *)-1;     /* -1: no change;  NULL: none */
 229         char *p;
 230         struct jfs_sb_info *sbi = JFS_SBI(sb);
 231
 232         *newLVSize = 0;
 233
 234         if (!options)
 235                 return 1;
 236
 237         while ((p = strsep(&options, ",")) != NULL) {
 238                 substring_t args[MAX_OPT_ARGS];
 239                 int token;
 240                 if (!*p)
 241                         continue;
 242
 243                 token = match_token(p, tokens, args);
 244                 switch (token) {
 245                 case Opt_integrity:
 246                         *flag &= ~JFS_NOINTEGRITY;
 247                         break;
 248                 case Opt_nointegrity:
 249                         *flag |= JFS_NOINTEGRITY;
 250                         break;
 251                 case Opt_ignore:
 252                         /* Silently ignore the quota options */
 253                         /* Don't do anything ;-) */
 254                         break;
 255                 case Opt_iocharset:
 256                         if (nls_map && nls_map != (void *) -1)
 257                                 unload_nls(nls_map);
 258                         if (!strcmp(args[0].from, "none"))
 259                                 nls_map = NULL;
 260                         else {
 261                                 nls_map = load_nls(args[0].from);
 262                                 if (!nls_map) {
 263                                         pr_err("JFS: charset not found\n");
 264                                         goto cleanup;
 265                                 }
 266                         }
 267                         break;
 268                 case Opt_resize:
 269                 {
 270                         char *resize = args[0].from;
 271                         *newLVSize = simple_strtoull(resize, &resize, 0);
 272                         break;
 273                 }
 274                 case Opt_resize_nosize:
 275                 {
 276                         *newLVSize = sb->s_bdev->bd_inode->i_size >>
 277                                 sb->s_blocksize_bits;
 278                         if (*newLVSize == 0)
 279                                 pr_err("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                                 pr_err("JFS: %s is an invalid error handler\n",
 301                                        errors);
 302                                 goto cleanup;
 303                         }
 304                         break;
 305                 }
 306
 307 #ifdef CONFIG_QUOTA
 308                 case Opt_quota:
 309                 case Opt_usrquota:
 310                         *flag |= JFS_USRQUOTA;
 311                         break;
 312                 case Opt_grpquota:
 313                         *flag |= JFS_GRPQUOTA;
 314                         break;
 315 #else
 316                 case Opt_usrquota:
 317                 case Opt_grpquota:
 318                 case Opt_quota:
 319                         pr_err("JFS: quota operations not supported\n");
 320                         break;
 321 #endif
 322                 case Opt_uid:
 323                 {
 324                         char *uid = args[0].from;
 325                         uid_t val = simple_strtoul(uid, &uid, 0);
 326                         sbi->uid = make_kuid(current_user_ns(), val);
 327                         if (!uid_valid(sbi->uid))
 328                                 goto cleanup;
 329                         break;
 330                 }
 331
 332                 case Opt_gid:
 333                 {
 334                         char *gid = args[0].from;
 335                         gid_t val = simple_strtoul(gid, &gid, 0);
 336                         sbi->gid = make_kgid(current_user_ns(), val);
 337                         if (!gid_valid(sbi->gid))
 338                                 goto cleanup;
 339                         break;
 340                 }
 341
 342                 case Opt_umask:
 343                 {
 344                         char *umask = args[0].from;
 345                         sbi->umask = simple_strtoul(umask, &umask, 8);
 346                         if (sbi->umask & ~0777) {
 347                                 pr_err("JFS: Invalid value of umask\n");
 348                                 goto cleanup;
 349                         }
 350                         break;
 351                 }
 352
 353                 case Opt_discard:
 354                 {
 355                         struct request_queue *q = bdev_get_queue(sb->s_bdev);
 356                         /* if set to 1, even copying files will cause
 357                          * trimming :O
 358                          * -> user has more control over the online trimming
 359                          */
 360                         sbi->minblks_trim = 64;
 361                         if (blk_queue_discard(q)) {
 362                                 *flag |= JFS_DISCARD;
 363                         } else {
 364                                 pr_err("JFS: discard option " \
 365                                         "not supported on device\n");
 366                         }
 367                         break;
 368                 }
 369
 370                 case Opt_nodiscard:
 371                         *flag &= ~JFS_DISCARD;
 372                         break;
 373
 374                 case Opt_discard_minblk:
 375                 {
 376                         struct request_queue *q = bdev_get_queue(sb->s_bdev);
 377                         char *minblks_trim = args[0].from;
 378                         if (blk_queue_discard(q)) {
 379                                 *flag |= JFS_DISCARD;
 380                                 sbi->minblks_trim = simple_strtoull(
 381                                         minblks_trim, &minblks_trim, 0);
 382                         } else {
 383                                 pr_err("JFS: discard option " \
 384                                         "not supported on device\n");
 385                         }
 386                         break;
 387                 }
 388
 389                 default:
 390                         printk("jfs: Unrecognized mount option \"%s\" "
 391                                         " or missing value\n", p);
 392                         goto cleanup;
 393                 }
 394         }
 395
 396         if (nls_map != (void *) -1) {
 397                 /* Discard old (if remount) */
 398                 unload_nls(sbi->nls_tab);
 399                 sbi->nls_tab = nls_map;
 400         }
 401         return 1;
 402
 403 cleanup:
 404         if (nls_map && nls_map != (void *) -1)
 405                 unload_nls(nls_map);
 406         return 0;
 407 }
 408
 409 static int jfs_remount(struct super_block *sb, int *flags, char *data)
 410 {
 411         s64 newLVSize = 0;
 412         int rc = 0;
 413         int flag = JFS_SBI(sb)->flag;
 414         int ret;
 415
 416         if (!parse_options(data, sb, &newLVSize, &flag)) {
 417                 return -EINVAL;
 418         }
 419
 420         if (newLVSize) {
 421                 if (sb->s_flags & MS_RDONLY) {
 422                         pr_err("JFS: resize requires volume" \
 423                                 " to be mounted read-write\n");
 424                         return -EROFS;
 425                 }
 426                 rc = jfs_extendfs(sb, newLVSize, 0);
 427                 if (rc)
 428                         return rc;
 429         }
 430
 431         if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
 432                 /*
 433                  * Invalidate any previously read metadata.  fsck may have
 434                  * changed the on-disk data since we mounted r/o
 435                  */
 436                 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
 437
 438                 JFS_SBI(sb)->flag = flag;
 439                 ret = jfs_mount_rw(sb, 1);
 440
 441                 /* mark the fs r/w for quota activity */
 442                 sb->s_flags &= ~MS_RDONLY;
 443
 444                 dquot_resume(sb, -1);
 445                 return ret;
 446         }
 447         if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
 448                 rc = dquot_suspend(sb, -1);
 449                 if (rc < 0) {
 450                         return rc;
 451                 }
 452                 rc = jfs_umount_rw(sb);
 453                 JFS_SBI(sb)->flag = flag;
 454                 return rc;
 455         }
 456         if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
 457                 if (!(sb->s_flags & MS_RDONLY)) {
 458                         rc = jfs_umount_rw(sb);
 459                         if (rc)
 460                                 return rc;
 461
 462                         JFS_SBI(sb)->flag = flag;
 463                         ret = jfs_mount_rw(sb, 1);
 464                         return ret;
 465                 }
 466         JFS_SBI(sb)->flag = flag;
 467
 468         return 0;
 469 }
 470
 471 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
 472 {
 473         struct jfs_sb_info *sbi;
 474         struct inode *inode;
 475         int rc;
 476         s64 newLVSize = 0;
 477         int flag, ret = -EINVAL;
 478
 479         jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
 480
 481         if (!new_valid_dev(sb->s_bdev->bd_dev))
 482                 return -EOVERFLOW;
 483
 484         sbi = kzalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
 485         if (!sbi)
 486                 return -ENOMEM;
 487
 488         sb->s_fs_info = sbi;
 489         sb->s_max_links = JFS_LINK_MAX;
 490         sbi->sb = sb;
 491         sbi->uid = INVALID_UID;
 492         sbi->gid = INVALID_GID;
 493         sbi->umask = -1;
 494
 495         /* initialize the mount flag and determine the default error handler */
 496         flag = JFS_ERR_REMOUNT_RO;
 497
 498         if (!parse_options((char *) data, sb, &newLVSize, &flag))
 499                 goto out_kfree;
 500         sbi->flag = flag;
 501
 502 #ifdef CONFIG_JFS_POSIX_ACL
 503         sb->s_flags |= MS_POSIXACL;
 504 #endif
 505
 506         if (newLVSize) {
 507                 pr_err("resize option for remount only\n");
 508                 goto out_kfree;
 509         }
 510
 511         /*
 512          * Initialize blocksize to 4K.
 513          */
 514         sb_set_blocksize(sb, PSIZE);
 515
 516         /*
 517          * Set method vectors.
 518          */
 519         sb->s_op = &jfs_super_operations;
 520         sb->s_export_op = &jfs_export_operations;
 521 #ifdef CONFIG_QUOTA
 522         sb->dq_op = &dquot_operations;
 523         sb->s_qcop = &dquot_quotactl_ops;
 524 #endif
 525
 526         /*
 527          * Initialize direct-mapping inode/address-space
 528          */
 529         inode = new_inode(sb);
 530         if (inode == NULL) {
 531                 ret = -ENOMEM;
 532                 goto out_unload;
 533         }
 534         inode->i_ino = 0;
 535         inode->i_size = sb->s_bdev->bd_inode->i_size;
 536         inode->i_mapping->a_ops = &jfs_metapage_aops;
 537         insert_inode_hash(inode);
 538         mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
 539
 540         sbi->direct_inode = inode;
 541
 542         rc = jfs_mount(sb);
 543         if (rc) {
 544                 if (!silent) {
 545                         jfs_err("jfs_mount failed w/return code = %d", rc);
 546                 }
 547                 goto out_mount_failed;
 548         }
 549         if (sb->s_flags & MS_RDONLY)
 550                 sbi->log = NULL;
 551         else {
 552                 rc = jfs_mount_rw(sb, 0);
 553                 if (rc) {
 554                         if (!silent) {
 555                                 jfs_err("jfs_mount_rw failed, return code = %d",
 556                                         rc);
 557                         }
 558                         goto out_no_rw;
 559                 }
 560         }
 561
 562         sb->s_magic = JFS_SUPER_MAGIC;
 563
 564         if (sbi->mntflag & JFS_OS2)
 565                 sb->s_d_op = &jfs_ci_dentry_operations;
 566
 567         inode = jfs_iget(sb, ROOT_I);
 568         if (IS_ERR(inode)) {
 569                 ret = PTR_ERR(inode);
 570                 goto out_no_rw;
 571         }
 572         sb->s_root = d_make_root(inode);
 573         if (!sb->s_root)
 574                 goto out_no_root;
 575
 576         /* logical blocks are represented by 40 bits in pxd_t, etc. */
 577         sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
 578 #if BITS_PER_LONG == 32
 579         /*
 580          * Page cache is indexed by long.
 581          * I would use MAX_LFS_FILESIZE, but it's only half as big
 582          */
 583         sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, (u64)sb->s_maxbytes);
 584 #endif
 585         sb->s_time_gran = 1;
 586         return 0;
 587
 588 out_no_root:
 589         jfs_err("jfs_read_super: get root dentry failed");
 590
 591 out_no_rw:
 592         rc = jfs_umount(sb);
 593         if (rc) {
 594                 jfs_err("jfs_umount failed with return code %d", rc);
 595         }
 596 out_mount_failed:
 597         filemap_write_and_wait(sbi->direct_inode->i_mapping);
 598         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
 599         make_bad_inode(sbi->direct_inode);
 600         iput(sbi->direct_inode);
 601         sbi->direct_inode = NULL;
 602 out_unload:
 603         if (sbi->nls_tab)
 604                 unload_nls(sbi->nls_tab);
 605 out_kfree:
 606         kfree(sbi);
 607         return ret;
 608 }
 609
 610 static int jfs_freeze(struct super_block *sb)
 611 {
 612         struct jfs_sb_info *sbi = JFS_SBI(sb);
 613         struct jfs_log *log = sbi->log;
 614         int rc = 0;
 615
 616         if (!(sb->s_flags & MS_RDONLY)) {
 617                 txQuiesce(sb);
 618                 rc = lmLogShutdown(log);
 619                 if (rc) {
 620                         jfs_error(sb, "jfs_freeze: lmLogShutdown failed");
 621
 622                         /* let operations fail rather than hang */
 623                         txResume(sb);
 624
 625                         return rc;
 626                 }
 627                 rc = updateSuper(sb, FM_CLEAN);
 628                 if (rc) {
 629                         jfs_err("jfs_freeze: updateSuper failed\n");
 630                         /*
 631                          * Don't fail here. Everything succeeded except
 632                          * marking the superblock clean, so there's really
 633                          * no harm in leaving it frozen for now.
 634                          */
 635                 }
 636         }
 637         return 0;
 638 }
 639
 640 static int jfs_unfreeze(struct super_block *sb)
 641 {
 642         struct jfs_sb_info *sbi = JFS_SBI(sb);
 643         struct jfs_log *log = sbi->log;
 644         int rc = 0;
 645
 646         if (!(sb->s_flags & MS_RDONLY)) {
 647                 rc = updateSuper(sb, FM_MOUNT);
 648                 if (rc) {
 649                         jfs_error(sb, "jfs_unfreeze: updateSuper failed");
 650                         goto out;
 651                 }
 652                 rc = lmLogInit(log);
 653                 if (rc)
 654                         jfs_error(sb, "jfs_unfreeze: lmLogInit failed");
 655 out:
 656                 txResume(sb);
 657         }
 658         return rc;
 659 }
 660
 661 static struct dentry *jfs_do_mount(struct file_system_type *fs_type,
 662         int flags, const char *dev_name, void *data)
 663 {
 664         return mount_bdev(fs_type, flags, dev_name, data, jfs_fill_super);
 665 }
 666
 667 static int jfs_sync_fs(struct super_block *sb, int wait)
 668 {
 669         struct jfs_log *log = JFS_SBI(sb)->log;
 670
 671         /* log == NULL indicates read-only mount */
 672         if (log) {
 673                 /*
 674                  * Write quota structures to quota file, sync_blockdev() will
 675                  * write them to disk later
 676                  */
 677                 dquot_writeback_dquots(sb, -1);
 678                 jfs_flush_journal(log, wait);
 679                 jfs_syncpt(log, 0);
 680         }
 681
 682         return 0;
 683 }
 684
 685 static int jfs_show_options(struct seq_file *seq, struct dentry *root)
 686 {
 687         struct jfs_sb_info *sbi = JFS_SBI(root->d_sb);
 688
 689         if (uid_valid(sbi->uid))
 690                 seq_printf(seq, ",uid=%d", from_kuid(&init_user_ns, sbi->uid));
 691         if (gid_valid(sbi->gid))
 692                 seq_printf(seq, ",gid=%d", from_kgid(&init_user_ns, sbi->gid));
 693         if (sbi->umask != -1)
 694                 seq_printf(seq, ",umask=%03o", sbi->umask);
 695         if (sbi->flag & JFS_NOINTEGRITY)
 696                 seq_puts(seq, ",nointegrity");
 697         if (sbi->flag & JFS_DISCARD)
 698                 seq_printf(seq, ",discard=%u", sbi->minblks_trim);
 699         if (sbi->nls_tab)
 700                 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset);
 701         if (sbi->flag & JFS_ERR_CONTINUE)
 702                 seq_printf(seq, ",errors=continue");
 703         if (sbi->flag & JFS_ERR_PANIC)
 704                 seq_printf(seq, ",errors=panic");
 705
 706 #ifdef CONFIG_QUOTA
 707         if (sbi->flag & JFS_USRQUOTA)
 708                 seq_puts(seq, ",usrquota");
 709
 710         if (sbi->flag & JFS_GRPQUOTA)
 711                 seq_puts(seq, ",grpquota");
 712 #endif
 713
 714         return 0;
 715 }
 716
 717 #ifdef CONFIG_QUOTA
 718
 719 /* Read data from quotafile - avoid pagecache and such because we cannot afford
 720  * acquiring the locks... As quota files are never truncated and quota code
 721  * itself serializes the operations (and no one else should touch the files)
 722  * we don't have to be afraid of races */
 723 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
 724                               size_t len, loff_t off)
 725 {
 726         struct inode *inode = sb_dqopt(sb)->files[type];
 727         sector_t blk = off >> sb->s_blocksize_bits;
 728         int err = 0;
 729         int offset = off & (sb->s_blocksize - 1);
 730         int tocopy;
 731         size_t toread;
 732         struct buffer_head tmp_bh;
 733         struct buffer_head *bh;
 734         loff_t i_size = i_size_read(inode);
 735
 736         if (off > i_size)
 737                 return 0;
 738         if (off+len > i_size)
 739                 len = i_size-off;
 740         toread = len;
 741         while (toread > 0) {
 742                 tocopy = sb->s_blocksize - offset < toread ?
 743                                 sb->s_blocksize - offset : toread;
 744
 745                 tmp_bh.b_state = 0;
 746                 tmp_bh.b_size = 1 << inode->i_blkbits;
 747                 err = jfs_get_block(inode, blk, &tmp_bh, 0);
 748                 if (err)
 749                         return err;
 750                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
 751                         memset(data, 0, tocopy);
 752                 else {
 753                         bh = sb_bread(sb, tmp_bh.b_blocknr);
 754                         if (!bh)
 755                                 return -EIO;
 756                         memcpy(data, bh->b_data+offset, tocopy);
 757                         brelse(bh);
 758                 }
 759                 offset = 0;
 760                 toread -= tocopy;
 761                 data += tocopy;
 762                 blk++;
 763         }
 764         return len;
 765 }
 766
 767 /* Write to quotafile */
 768 static ssize_t jfs_quota_write(struct super_block *sb, int type,
 769                                const char *data, size_t len, loff_t off)
 770 {
 771         struct inode *inode = sb_dqopt(sb)->files[type];
 772         sector_t blk = off >> sb->s_blocksize_bits;
 773         int err = 0;
 774         int offset = off & (sb->s_blocksize - 1);
 775         int tocopy;
 776         size_t towrite = len;
 777         struct buffer_head tmp_bh;
 778         struct buffer_head *bh;
 779
 780         mutex_lock(&inode->i_mutex);
 781         while (towrite > 0) {
 782                 tocopy = sb->s_blocksize - offset < towrite ?
 783                                 sb->s_blocksize - offset : towrite;
 784
 785                 tmp_bh.b_state = 0;
 786                 tmp_bh.b_size = 1 << inode->i_blkbits;
 787                 err = jfs_get_block(inode, blk, &tmp_bh, 1);
 788                 if (err)
 789                         goto out;
 790                 if (offset || tocopy != sb->s_blocksize)
 791                         bh = sb_bread(sb, tmp_bh.b_blocknr);
 792                 else
 793                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
 794                 if (!bh) {
 795                         err = -EIO;
 796                         goto out;
 797                 }
 798                 lock_buffer(bh);
 799                 memcpy(bh->b_data+offset, data, tocopy);
 800                 flush_dcache_page(bh->b_page);
 801                 set_buffer_uptodate(bh);
 802                 mark_buffer_dirty(bh);
 803                 unlock_buffer(bh);
 804                 brelse(bh);
 805                 offset = 0;
 806                 towrite -= tocopy;
 807                 data += tocopy;
 808                 blk++;
 809         }
 810 out:
 811         if (len == towrite) {
 812                 mutex_unlock(&inode->i_mutex);
 813                 return err;
 814         }
 815         if (inode->i_size < off+len-towrite)
 816                 i_size_write(inode, off+len-towrite);
 817         inode->i_version++;
 818         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
 819         mark_inode_dirty(inode);
 820         mutex_unlock(&inode->i_mutex);
 821         return len - towrite;
 822 }
 823
 824 #endif
 825
 826 static const struct super_operations jfs_super_operations = {
 827         .alloc_inode    = jfs_alloc_inode,
 828         .destroy_inode  = jfs_destroy_inode,
 829         .dirty_inode    = jfs_dirty_inode,
 830         .write_inode    = jfs_write_inode,
 831         .evict_inode    = jfs_evict_inode,
 832         .put_super      = jfs_put_super,
 833         .sync_fs        = jfs_sync_fs,
 834         .freeze_fs      = jfs_freeze,
 835         .unfreeze_fs    = jfs_unfreeze,
 836         .statfs         = jfs_statfs,
 837         .remount_fs     = jfs_remount,
 838         .show_options   = jfs_show_options,
 839 #ifdef CONFIG_QUOTA
 840         .quota_read     = jfs_quota_read,
 841         .quota_write    = jfs_quota_write,
 842 #endif
 843 };
 844
 845 static const struct export_operations jfs_export_operations = {
 846         .fh_to_dentry   = jfs_fh_to_dentry,
 847         .fh_to_parent   = jfs_fh_to_parent,
 848         .get_parent     = jfs_get_parent,
 849 };
 850
 851 static struct file_system_type jfs_fs_type = {
 852         .owner          = THIS_MODULE,
 853         .name           = "jfs",
 854         .mount          = jfs_do_mount,
 855         .kill_sb        = kill_block_super,
 856         .fs_flags       = FS_REQUIRES_DEV,
 857 };
 858 MODULE_ALIAS_FS("jfs");
 859
 860 static void init_once(void *foo)
 861 {
 862         struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
 863
 864         memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
 865         INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
 866         init_rwsem(&jfs_ip->rdwrlock);
 867         mutex_init(&jfs_ip->commit_mutex);
 868         init_rwsem(&jfs_ip->xattr_sem);
 869         spin_lock_init(&jfs_ip->ag_lock);
 870         jfs_ip->active_ag = -1;
 871         inode_init_once(&jfs_ip->vfs_inode);
 872 }
 873
 874 static int __init init_jfs_fs(void)
 875 {
 876         int i;
 877         int rc;
 878
 879         jfs_inode_cachep =
 880             kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
 881                             SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
 882                             init_once);
 883         if (jfs_inode_cachep == NULL)
 884                 return -ENOMEM;
 885
 886         /*
 887          * Metapage initialization
 888          */
 889         rc = metapage_init();
 890         if (rc) {
 891                 jfs_err("metapage_init failed w/rc = %d", rc);
 892                 goto free_slab;
 893         }
 894
 895         /*
 896          * Transaction Manager initialization
 897          */
 898         rc = txInit();
 899         if (rc) {
 900                 jfs_err("txInit failed w/rc = %d", rc);
 901                 goto free_metapage;
 902         }
 903
 904         /*
 905          * I/O completion thread (endio)
 906          */
 907         jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
 908         if (IS_ERR(jfsIOthread)) {
 909                 rc = PTR_ERR(jfsIOthread);
 910                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
 911                 goto end_txmngr;
 912         }
 913
 914         if (commit_threads < 1)
 915                 commit_threads = num_online_cpus();
 916         if (commit_threads > MAX_COMMIT_THREADS)
 917                 commit_threads = MAX_COMMIT_THREADS;
 918
 919         for (i = 0; i < commit_threads; i++) {
 920                 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, "jfsCommit");
 921                 if (IS_ERR(jfsCommitThread[i])) {
 922                         rc = PTR_ERR(jfsCommitThread[i]);
 923                         jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
 924                         commit_threads = i;
 925                         goto kill_committask;
 926                 }
 927         }
 928
 929         jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
 930         if (IS_ERR(jfsSyncThread)) {
 931                 rc = PTR_ERR(jfsSyncThread);
 932                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
 933                 goto kill_committask;
 934         }
 935
 936 #ifdef PROC_FS_JFS
 937         jfs_proc_init();
 938 #endif
 939
 940         rc = register_filesystem(&jfs_fs_type);
 941         if (!rc)
 942                 return 0;
 943
 944 #ifdef PROC_FS_JFS
 945         jfs_proc_clean();
 946 #endif
 947         kthread_stop(jfsSyncThread);
 948 kill_committask:
 949         for (i = 0; i < commit_threads; i++)
 950                 kthread_stop(jfsCommitThread[i]);
 951         kthread_stop(jfsIOthread);
 952 end_txmngr:
 953         txExit();
 954 free_metapage:
 955         metapage_exit();
 956 free_slab:
 957         kmem_cache_destroy(jfs_inode_cachep);
 958         return rc;
 959 }
 960
 961 static void __exit exit_jfs_fs(void)
 962 {
 963         int i;
 964
 965         jfs_info("exit_jfs_fs called");
 966
 967         txExit();
 968         metapage_exit();
 969
 970         kthread_stop(jfsIOthread);
 971         for (i = 0; i < commit_threads; i++)
 972                 kthread_stop(jfsCommitThread[i]);
 973         kthread_stop(jfsSyncThread);
 974 #ifdef PROC_FS_JFS
 975         jfs_proc_clean();
 976 #endif
 977         unregister_filesystem(&jfs_fs_type);
 978
 979         /*
 980          * Make sure all delayed rcu free inodes are flushed before we
 981          * destroy cache.
 982          */
 983         rcu_barrier();
 984         kmem_cache_destroy(jfs_inode_cachep);
 985 }
 986
 987 module_init(init_jfs_fs)
 988 module_exit(exit_jfs_fs)