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;
  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 as read-only",
  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 *fmt, ...)
  96 {
  97         struct va_format vaf;
  98         va_list args;
  99
 100         va_start(args, fmt);
 101
 102         vaf.fmt = fmt;
 103         vaf.va = &args;
 104
 105         pr_err("ERROR: (device %s): %ps: %pV\n",
 106                sb->s_id, __builtin_return_address(0), &vaf);
 107
 108         va_end(args);
 109
 110         jfs_handle_error(sb);
 111 }
 112
 113 static struct inode *jfs_alloc_inode(struct super_block *sb)
 114 {
 115         struct jfs_inode_info *jfs_inode;
 116
 117         jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS);
 118         if (!jfs_inode)
 119                 return NULL;
 120 #ifdef CONFIG_QUOTA
 121         memset(&jfs_inode->i_dquot, 0, sizeof(jfs_inode->i_dquot));
 122 #endif
 123         return &jfs_inode->vfs_inode;
 124 }
 125
 126 static void jfs_i_callback(struct rcu_head *head)
 127 {
 128         struct inode *inode = container_of(head, struct inode, i_rcu);
 129         struct jfs_inode_info *ji = JFS_IP(inode);
 130         kmem_cache_free(jfs_inode_cachep, ji);
 131 }
 132
 133 static void jfs_destroy_inode(struct inode *inode)
 134 {
 135         struct jfs_inode_info *ji = JFS_IP(inode);
 136
 137         BUG_ON(!list_empty(&ji->anon_inode_list));
 138
 139         spin_lock_irq(&ji->ag_lock);
 140         if (ji->active_ag != -1) {
 141                 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
 142                 atomic_dec(&bmap->db_active[ji->active_ag]);
 143                 ji->active_ag = -1;
 144         }
 145         spin_unlock_irq(&ji->ag_lock);
 146         call_rcu(&inode->i_rcu, jfs_i_callback);
 147 }
 148
 149 static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 150 {
 151         struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb);
 152         s64 maxinodes;
 153         struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
 154
 155         jfs_info("In jfs_statfs");
 156         buf->f_type = JFS_SUPER_MAGIC;
 157         buf->f_bsize = sbi->bsize;
 158         buf->f_blocks = sbi->bmap->db_mapsize;
 159         buf->f_bfree = sbi->bmap->db_nfree;
 160         buf->f_bavail = sbi->bmap->db_nfree;
 161         /*
 162          * If we really return the number of allocated & free inodes, some
 163          * applications will fail because they won't see enough free inodes.
 164          * We'll try to calculate some guess as to how many inodes we can
 165          * really allocate
 166          *
 167          * buf->f_files = atomic_read(&imap->im_numinos);
 168          * buf->f_ffree = atomic_read(&imap->im_numfree);
 169          */
 170         maxinodes = min((s64) atomic_read(&imap->im_numinos) +
 171                         ((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
 172                          << L2INOSPEREXT), (s64) 0xffffffffLL);
 173         buf->f_files = maxinodes;
 174         buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
 175                                     atomic_read(&imap->im_numfree));
 176         buf->f_fsid.val[0] = (u32)crc32_le(0, sbi->uuid, sizeof(sbi->uuid)/2);
 177         buf->f_fsid.val[1] = (u32)crc32_le(0, sbi->uuid + sizeof(sbi->uuid)/2,
 178                                         sizeof(sbi->uuid)/2);
 179
 180         buf->f_namelen = JFS_NAME_MAX;
 181         return 0;
 182 }
 183
 184 static void jfs_put_super(struct super_block *sb)
 185 {
 186         struct jfs_sb_info *sbi = JFS_SBI(sb);
 187         int rc;
 188
 189         jfs_info("In jfs_put_super");
 190
 191         dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
 192
 193         rc = jfs_umount(sb);
 194         if (rc)
 195                 jfs_err("jfs_umount failed with return code %d", rc);
 196
 197         unload_nls(sbi->nls_tab);
 198
 199         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
 200         iput(sbi->direct_inode);
 201
 202         kfree(sbi);
 203 }
 204
 205 enum {
 206         Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
 207         Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota,
 208         Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask,
 209         Opt_discard, Opt_nodiscard, Opt_discard_minblk
 210 };
 211
 212 static const match_table_t tokens = {
 213         {Opt_integrity, "integrity"},
 214         {Opt_nointegrity, "nointegrity"},
 215         {Opt_iocharset, "iocharset=%s"},
 216         {Opt_resize, "resize=%u"},
 217         {Opt_resize_nosize, "resize"},
 218         {Opt_errors, "errors=%s"},
 219         {Opt_ignore, "noquota"},
 220         {Opt_ignore, "quota"},
 221         {Opt_usrquota, "usrquota"},
 222         {Opt_grpquota, "grpquota"},
 223         {Opt_uid, "uid=%u"},
 224         {Opt_gid, "gid=%u"},
 225         {Opt_umask, "umask=%u"},
 226         {Opt_discard, "discard"},
 227         {Opt_nodiscard, "nodiscard"},
 228         {Opt_discard_minblk, "discard=%u"},
 229         {Opt_err, NULL}
 230 };
 231
 232 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
 233                          int *flag)
 234 {
 235         void *nls_map = (void *)-1;     /* -1: no change;  NULL: none */
 236         char *p;
 237         struct jfs_sb_info *sbi = JFS_SBI(sb);
 238
 239         *newLVSize = 0;
 240
 241         if (!options)
 242                 return 1;
 243
 244         while ((p = strsep(&options, ",")) != NULL) {
 245                 substring_t args[MAX_OPT_ARGS];
 246                 int token;
 247                 if (!*p)
 248                         continue;
 249
 250                 token = match_token(p, tokens, args);
 251                 switch (token) {
 252                 case Opt_integrity:
 253                         *flag &= ~JFS_NOINTEGRITY;
 254                         break;
 255                 case Opt_nointegrity:
 256                         *flag |= JFS_NOINTEGRITY;
 257                         break;
 258                 case Opt_ignore:
 259                         /* Silently ignore the quota options */
 260                         /* Don't do anything ;-) */
 261                         break;
 262                 case Opt_iocharset:
 263                         if (nls_map && nls_map != (void *) -1)
 264                                 unload_nls(nls_map);
 265                         if (!strcmp(args[0].from, "none"))
 266                                 nls_map = NULL;
 267                         else {
 268                                 nls_map = load_nls(args[0].from);
 269                                 if (!nls_map) {
 270                                         pr_err("JFS: charset not found\n");
 271                                         goto cleanup;
 272                                 }
 273                         }
 274                         break;
 275                 case Opt_resize:
 276                 {
 277                         char *resize = args[0].from;
 278                         int rc = kstrtoll(resize, 0, newLVSize);
 279
 280                         if (rc)
 281                                 goto cleanup;
 282                         break;
 283                 }
 284                 case Opt_resize_nosize:
 285                 {
 286                         *newLVSize = sb->s_bdev->bd_inode->i_size >>
 287                                 sb->s_blocksize_bits;
 288                         if (*newLVSize == 0)
 289                                 pr_err("JFS: Cannot determine volume size\n");
 290                         break;
 291                 }
 292                 case Opt_errors:
 293                 {
 294                         char *errors = args[0].from;
 295                         if (!errors || !*errors)
 296                                 goto cleanup;
 297                         if (!strcmp(errors, "continue")) {
 298                                 *flag &= ~JFS_ERR_REMOUNT_RO;
 299                                 *flag &= ~JFS_ERR_PANIC;
 300                                 *flag |= JFS_ERR_CONTINUE;
 301                         } else if (!strcmp(errors, "remount-ro")) {
 302                                 *flag &= ~JFS_ERR_CONTINUE;
 303                                 *flag &= ~JFS_ERR_PANIC;
 304                                 *flag |= JFS_ERR_REMOUNT_RO;
 305                         } else if (!strcmp(errors, "panic")) {
 306                                 *flag &= ~JFS_ERR_CONTINUE;
 307                                 *flag &= ~JFS_ERR_REMOUNT_RO;
 308                                 *flag |= JFS_ERR_PANIC;
 309                         } else {
 310                                 pr_err("JFS: %s is an invalid error handler\n",
 311                                        errors);
 312                                 goto cleanup;
 313                         }
 314                         break;
 315                 }
 316
 317 #ifdef CONFIG_QUOTA
 318                 case Opt_quota:
 319                 case Opt_usrquota:
 320                         *flag |= JFS_USRQUOTA;
 321                         break;
 322                 case Opt_grpquota:
 323                         *flag |= JFS_GRPQUOTA;
 324                         break;
 325 #else
 326                 case Opt_usrquota:
 327                 case Opt_grpquota:
 328                 case Opt_quota:
 329                         pr_err("JFS: quota operations not supported\n");
 330                         break;
 331 #endif
 332                 case Opt_uid:
 333                 {
 334                         char *uid = args[0].from;
 335                         uid_t val;
 336                         int rc = kstrtouint(uid, 0, &val);
 337
 338                         if (rc)
 339                                 goto cleanup;
 340                         sbi->uid = make_kuid(current_user_ns(), val);
 341                         if (!uid_valid(sbi->uid))
 342                                 goto cleanup;
 343                         break;
 344                 }
 345
 346                 case Opt_gid:
 347                 {
 348                         char *gid = args[0].from;
 349                         gid_t val;
 350                         int rc = kstrtouint(gid, 0, &val);
 351
 352                         if (rc)
 353                                 goto cleanup;
 354                         sbi->gid = make_kgid(current_user_ns(), val);
 355                         if (!gid_valid(sbi->gid))
 356                                 goto cleanup;
 357                         break;
 358                 }
 359
 360                 case Opt_umask:
 361                 {
 362                         char *umask = args[0].from;
 363                         int rc = kstrtouint(umask, 8, &sbi->umask);
 364
 365                         if (rc)
 366                                 goto cleanup;
 367                         if (sbi->umask & ~0777) {
 368                                 pr_err("JFS: Invalid value of umask\n");
 369                                 goto cleanup;
 370                         }
 371                         break;
 372                 }
 373
 374                 case Opt_discard:
 375                 {
 376                         struct request_queue *q = bdev_get_queue(sb->s_bdev);
 377                         /* if set to 1, even copying files will cause
 378                          * trimming :O
 379                          * -> user has more control over the online trimming
 380                          */
 381                         sbi->minblks_trim = 64;
 382                         if (blk_queue_discard(q))
 383                                 *flag |= JFS_DISCARD;
 384                         else
 385                                 pr_err("JFS: discard option not supported on device\n");
 386                         break;
 387                 }
 388
 389                 case Opt_nodiscard:
 390                         *flag &= ~JFS_DISCARD;
 391                         break;
 392
 393                 case Opt_discard_minblk:
 394                 {
 395                         struct request_queue *q = bdev_get_queue(sb->s_bdev);
 396                         char *minblks_trim = args[0].from;
 397                         int rc;
 398                         if (blk_queue_discard(q)) {
 399                                 *flag |= JFS_DISCARD;
 400                                 rc = kstrtouint(minblks_trim, 0,
 401                                                 &sbi->minblks_trim);
 402                                 if (rc)
 403                                         goto cleanup;
 404                         } else
 405                                 pr_err("JFS: discard option not supported on device\n");
 406                         break;
 407                 }
 408
 409                 default:
 410                         printk("jfs: Unrecognized mount option \"%s\" or missing value\n",
 411                                p);
 412                         goto cleanup;
 413                 }
 414         }
 415
 416         if (nls_map != (void *) -1) {
 417                 /* Discard old (if remount) */
 418                 unload_nls(sbi->nls_tab);
 419                 sbi->nls_tab = nls_map;
 420         }
 421         return 1;
 422
 423 cleanup:
 424         if (nls_map && nls_map != (void *) -1)
 425                 unload_nls(nls_map);
 426         return 0;
 427 }
 428
 429 static int jfs_remount(struct super_block *sb, int *flags, char *data)
 430 {
 431         s64 newLVSize = 0;
 432         int rc = 0;
 433         int flag = JFS_SBI(sb)->flag;
 434         int ret;
 435
 436         sync_filesystem(sb);
 437         if (!parse_options(data, sb, &newLVSize, &flag))
 438                 return -EINVAL;
 439
 440         if (newLVSize) {
 441                 if (sb->s_flags & MS_RDONLY) {
 442                         pr_err("JFS: resize requires volume to be mounted read-write\n");
 443                         return -EROFS;
 444                 }
 445                 rc = jfs_extendfs(sb, newLVSize, 0);
 446                 if (rc)
 447                         return rc;
 448         }
 449
 450         if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
 451                 /*
 452                  * Invalidate any previously read metadata.  fsck may have
 453                  * changed the on-disk data since we mounted r/o
 454                  */
 455                 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
 456
 457                 JFS_SBI(sb)->flag = flag;
 458                 ret = jfs_mount_rw(sb, 1);
 459
 460                 /* mark the fs r/w for quota activity */
 461                 sb->s_flags &= ~MS_RDONLY;
 462
 463                 dquot_resume(sb, -1);
 464                 return ret;
 465         }
 466         if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
 467                 rc = dquot_suspend(sb, -1);
 468                 if (rc < 0)
 469                         return rc;
 470                 rc = jfs_umount_rw(sb);
 471                 JFS_SBI(sb)->flag = flag;
 472                 return rc;
 473         }
 474         if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
 475                 if (!(sb->s_flags & MS_RDONLY)) {
 476                         rc = jfs_umount_rw(sb);
 477                         if (rc)
 478                                 return rc;
 479
 480                         JFS_SBI(sb)->flag = flag;
 481                         ret = jfs_mount_rw(sb, 1);
 482                         return ret;
 483                 }
 484         JFS_SBI(sb)->flag = flag;
 485
 486         return 0;
 487 }
 488
 489 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
 490 {
 491         struct jfs_sb_info *sbi;
 492         struct inode *inode;
 493         int rc;
 494         s64 newLVSize = 0;
 495         int flag, ret = -EINVAL;
 496
 497         jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
 498
 499         sbi = kzalloc(sizeof(struct jfs_sb_info), GFP_KERNEL);
 500         if (!sbi)
 501                 return -ENOMEM;
 502
 503         sb->s_fs_info = sbi;
 504         sb->s_max_links = JFS_LINK_MAX;
 505         sbi->sb = sb;
 506         sbi->uid = INVALID_UID;
 507         sbi->gid = INVALID_GID;
 508         sbi->umask = -1;
 509
 510         /* initialize the mount flag and determine the default error handler */
 511         flag = JFS_ERR_REMOUNT_RO;
 512
 513         if (!parse_options((char *) data, sb, &newLVSize, &flag))
 514                 goto out_kfree;
 515         sbi->flag = flag;
 516
 517 #ifdef CONFIG_JFS_POSIX_ACL
 518         sb->s_flags |= MS_POSIXACL;
 519 #endif
 520
 521         if (newLVSize) {
 522                 pr_err("resize option for remount only\n");
 523                 goto out_kfree;
 524         }
 525
 526         /*
 527          * Initialize blocksize to 4K.
 528          */
 529         sb_set_blocksize(sb, PSIZE);
 530
 531         /*
 532          * Set method vectors.
 533          */
 534         sb->s_op = &jfs_super_operations;
 535         sb->s_export_op = &jfs_export_operations;
 536         sb->s_xattr = jfs_xattr_handlers;
 537 #ifdef CONFIG_QUOTA
 538         sb->dq_op = &dquot_operations;
 539         sb->s_qcop = &dquot_quotactl_ops;
 540         sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
 541 #endif
 542
 543         /*
 544          * Initialize direct-mapping inode/address-space
 545          */
 546         inode = new_inode(sb);
 547         if (inode == NULL) {
 548                 ret = -ENOMEM;
 549                 goto out_unload;
 550         }
 551         inode->i_ino = 0;
 552         inode->i_size = sb->s_bdev->bd_inode->i_size;
 553         inode->i_mapping->a_ops = &jfs_metapage_aops;
 554         hlist_add_fake(&inode->i_hash);
 555         mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
 556
 557         sbi->direct_inode = inode;
 558
 559         rc = jfs_mount(sb);
 560         if (rc) {
 561                 if (!silent)
 562                         jfs_err("jfs_mount failed w/return code = %d", rc);
 563                 goto out_mount_failed;
 564         }
 565         if (sb->s_flags & MS_RDONLY)
 566                 sbi->log = NULL;
 567         else {
 568                 rc = jfs_mount_rw(sb, 0);
 569                 if (rc) {
 570                         if (!silent) {
 571                                 jfs_err("jfs_mount_rw failed, return code = %d",
 572                                         rc);
 573                         }
 574                         goto out_no_rw;
 575                 }
 576         }
 577
 578         sb->s_magic = JFS_SUPER_MAGIC;
 579
 580         if (sbi->mntflag & JFS_OS2)
 581                 sb->s_d_op = &jfs_ci_dentry_operations;
 582
 583         inode = jfs_iget(sb, ROOT_I);
 584         if (IS_ERR(inode)) {
 585                 ret = PTR_ERR(inode);
 586                 goto out_no_rw;
 587         }
 588         sb->s_root = d_make_root(inode);
 589         if (!sb->s_root)
 590                 goto out_no_root;
 591
 592         /* logical blocks are represented by 40 bits in pxd_t, etc. */
 593         sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
 594 #if BITS_PER_LONG == 32
 595         /*
 596          * Page cache is indexed by long.
 597          * I would use MAX_LFS_FILESIZE, but it's only half as big
 598          */
 599         sb->s_maxbytes = min(((u64) PAGE_SIZE << 32) - 1,
 600                              (u64)sb->s_maxbytes);
 601 #endif
 602         sb->s_time_gran = 1;
 603         return 0;
 604
 605 out_no_root:
 606         jfs_err("jfs_read_super: get root dentry failed");
 607
 608 out_no_rw:
 609         rc = jfs_umount(sb);
 610         if (rc)
 611                 jfs_err("jfs_umount failed with return code %d", rc);
 612 out_mount_failed:
 613         filemap_write_and_wait(sbi->direct_inode->i_mapping);
 614         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
 615         make_bad_inode(sbi->direct_inode);
 616         iput(sbi->direct_inode);
 617         sbi->direct_inode = NULL;
 618 out_unload:
 619         unload_nls(sbi->nls_tab);
 620 out_kfree:
 621         kfree(sbi);
 622         return ret;
 623 }
 624
 625 static int jfs_freeze(struct super_block *sb)
 626 {
 627         struct jfs_sb_info *sbi = JFS_SBI(sb);
 628         struct jfs_log *log = sbi->log;
 629         int rc = 0;
 630
 631         if (!(sb->s_flags & MS_RDONLY)) {
 632                 txQuiesce(sb);
 633                 rc = lmLogShutdown(log);
 634                 if (rc) {
 635                         jfs_error(sb, "lmLogShutdown failed\n");
 636
 637                         /* let operations fail rather than hang */
 638                         txResume(sb);
 639
 640                         return rc;
 641                 }
 642                 rc = updateSuper(sb, FM_CLEAN);
 643                 if (rc) {
 644                         jfs_err("jfs_freeze: updateSuper failed");
 645                         /*
 646                          * Don't fail here. Everything succeeded except
 647                          * marking the superblock clean, so there's really
 648                          * no harm in leaving it frozen for now.
 649                          */
 650                 }
 651         }
 652         return 0;
 653 }
 654
 655 static int jfs_unfreeze(struct super_block *sb)
 656 {
 657         struct jfs_sb_info *sbi = JFS_SBI(sb);
 658         struct jfs_log *log = sbi->log;
 659         int rc = 0;
 660
 661         if (!(sb->s_flags & MS_RDONLY)) {
 662                 rc = updateSuper(sb, FM_MOUNT);
 663                 if (rc) {
 664                         jfs_error(sb, "updateSuper failed\n");
 665                         goto out;
 666                 }
 667                 rc = lmLogInit(log);
 668                 if (rc)
 669                         jfs_error(sb, "lmLogInit failed\n");
 670 out:
 671                 txResume(sb);
 672         }
 673         return rc;
 674 }
 675
 676 static struct dentry *jfs_do_mount(struct file_system_type *fs_type,
 677         int flags, const char *dev_name, void *data)
 678 {
 679         return mount_bdev(fs_type, flags, dev_name, data, jfs_fill_super);
 680 }
 681
 682 static int jfs_sync_fs(struct super_block *sb, int wait)
 683 {
 684         struct jfs_log *log = JFS_SBI(sb)->log;
 685
 686         /* log == NULL indicates read-only mount */
 687         if (log) {
 688                 /*
 689                  * Write quota structures to quota file, sync_blockdev() will
 690                  * write them to disk later
 691                  */
 692                 dquot_writeback_dquots(sb, -1);
 693                 jfs_flush_journal(log, wait);
 694                 jfs_syncpt(log, 0);
 695         }
 696
 697         return 0;
 698 }
 699
 700 static int jfs_show_options(struct seq_file *seq, struct dentry *root)
 701 {
 702         struct jfs_sb_info *sbi = JFS_SBI(root->d_sb);
 703
 704         if (uid_valid(sbi->uid))
 705                 seq_printf(seq, ",uid=%d", from_kuid(&init_user_ns, sbi->uid));
 706         if (gid_valid(sbi->gid))
 707                 seq_printf(seq, ",gid=%d", from_kgid(&init_user_ns, sbi->gid));
 708         if (sbi->umask != -1)
 709                 seq_printf(seq, ",umask=%03o", sbi->umask);
 710         if (sbi->flag & JFS_NOINTEGRITY)
 711                 seq_puts(seq, ",nointegrity");
 712         if (sbi->flag & JFS_DISCARD)
 713                 seq_printf(seq, ",discard=%u", sbi->minblks_trim);
 714         if (sbi->nls_tab)
 715                 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset);
 716         if (sbi->flag & JFS_ERR_CONTINUE)
 717                 seq_printf(seq, ",errors=continue");
 718         if (sbi->flag & JFS_ERR_PANIC)
 719                 seq_printf(seq, ",errors=panic");
 720
 721 #ifdef CONFIG_QUOTA
 722         if (sbi->flag & JFS_USRQUOTA)
 723                 seq_puts(seq, ",usrquota");
 724
 725         if (sbi->flag & JFS_GRPQUOTA)
 726                 seq_puts(seq, ",grpquota");
 727 #endif
 728
 729         return 0;
 730 }
 731
 732 #ifdef CONFIG_QUOTA
 733
 734 /* Read data from quotafile - avoid pagecache and such because we cannot afford
 735  * acquiring the locks... As quota files are never truncated and quota code
 736  * itself serializes the operations (and no one else should touch the files)
 737  * we don't have to be afraid of races */
 738 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
 739                               size_t len, loff_t off)
 740 {
 741         struct inode *inode = sb_dqopt(sb)->files[type];
 742         sector_t blk = off >> sb->s_blocksize_bits;
 743         int err = 0;
 744         int offset = off & (sb->s_blocksize - 1);
 745         int tocopy;
 746         size_t toread;
 747         struct buffer_head tmp_bh;
 748         struct buffer_head *bh;
 749         loff_t i_size = i_size_read(inode);
 750
 751         if (off > i_size)
 752                 return 0;
 753         if (off+len > i_size)
 754                 len = i_size-off;
 755         toread = len;
 756         while (toread > 0) {
 757                 tocopy = sb->s_blocksize - offset < toread ?
 758                                 sb->s_blocksize - offset : toread;
 759
 760                 tmp_bh.b_state = 0;
 761                 tmp_bh.b_size = 1 << inode->i_blkbits;
 762                 err = jfs_get_block(inode, blk, &tmp_bh, 0);
 763                 if (err)
 764                         return err;
 765                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
 766                         memset(data, 0, tocopy);
 767                 else {
 768                         bh = sb_bread(sb, tmp_bh.b_blocknr);
 769                         if (!bh)
 770                                 return -EIO;
 771                         memcpy(data, bh->b_data+offset, tocopy);
 772                         brelse(bh);
 773                 }
 774                 offset = 0;
 775                 toread -= tocopy;
 776                 data += tocopy;
 777                 blk++;
 778         }
 779         return len;
 780 }
 781
 782 /* Write to quotafile */
 783 static ssize_t jfs_quota_write(struct super_block *sb, int type,
 784                                const char *data, size_t len, loff_t off)
 785 {
 786         struct inode *inode = sb_dqopt(sb)->files[type];
 787         sector_t blk = off >> sb->s_blocksize_bits;
 788         int err = 0;
 789         int offset = off & (sb->s_blocksize - 1);
 790         int tocopy;
 791         size_t towrite = len;
 792         struct buffer_head tmp_bh;
 793         struct buffer_head *bh;
 794
 795         inode_lock(inode);
 796         while (towrite > 0) {
 797                 tocopy = sb->s_blocksize - offset < towrite ?
 798                                 sb->s_blocksize - offset : towrite;
 799
 800                 tmp_bh.b_state = 0;
 801                 tmp_bh.b_size = 1 << inode->i_blkbits;
 802                 err = jfs_get_block(inode, blk, &tmp_bh, 1);
 803                 if (err)
 804                         goto out;
 805                 if (offset || tocopy != sb->s_blocksize)
 806                         bh = sb_bread(sb, tmp_bh.b_blocknr);
 807                 else
 808                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
 809                 if (!bh) {
 810                         err = -EIO;
 811                         goto out;
 812                 }
 813                 lock_buffer(bh);
 814                 memcpy(bh->b_data+offset, data, tocopy);
 815                 flush_dcache_page(bh->b_page);
 816                 set_buffer_uptodate(bh);
 817                 mark_buffer_dirty(bh);
 818                 unlock_buffer(bh);
 819                 brelse(bh);
 820                 offset = 0;
 821                 towrite -= tocopy;
 822                 data += tocopy;
 823                 blk++;
 824         }
 825 out:
 826         if (len == towrite) {
 827                 inode_unlock(inode);
 828                 return err;
 829         }
 830         if (inode->i_size < off+len-towrite)
 831                 i_size_write(inode, off+len-towrite);
 832         inode->i_version++;
 833         inode->i_mtime = inode->i_ctime = current_time(inode);
 834         mark_inode_dirty(inode);
 835         inode_unlock(inode);
 836         return len - towrite;
 837 }
 838
 839 static struct dquot **jfs_get_dquots(struct inode *inode)
 840 {
 841         return JFS_IP(inode)->i_dquot;
 842 }
 843 #endif
 844
 845 static const struct super_operations jfs_super_operations = {
 846         .alloc_inode    = jfs_alloc_inode,
 847         .destroy_inode  = jfs_destroy_inode,
 848         .dirty_inode    = jfs_dirty_inode,
 849         .write_inode    = jfs_write_inode,
 850         .evict_inode    = jfs_evict_inode,
 851         .put_super      = jfs_put_super,
 852         .sync_fs        = jfs_sync_fs,
 853         .freeze_fs      = jfs_freeze,
 854         .unfreeze_fs    = jfs_unfreeze,
 855         .statfs         = jfs_statfs,
 856         .remount_fs     = jfs_remount,
 857         .show_options   = jfs_show_options,
 858 #ifdef CONFIG_QUOTA
 859         .quota_read     = jfs_quota_read,
 860         .quota_write    = jfs_quota_write,
 861         .get_dquots     = jfs_get_dquots,
 862 #endif
 863 };
 864
 865 static const struct export_operations jfs_export_operations = {
 866         .fh_to_dentry   = jfs_fh_to_dentry,
 867         .fh_to_parent   = jfs_fh_to_parent,
 868         .get_parent     = jfs_get_parent,
 869 };
 870
 871 static struct file_system_type jfs_fs_type = {
 872         .owner          = THIS_MODULE,
 873         .name           = "jfs",
 874         .mount          = jfs_do_mount,
 875         .kill_sb        = kill_block_super,
 876         .fs_flags       = FS_REQUIRES_DEV,
 877 };
 878 MODULE_ALIAS_FS("jfs");
 879
 880 static void init_once(void *foo)
 881 {
 882         struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
 883
 884         memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
 885         INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
 886         init_rwsem(&jfs_ip->rdwrlock);
 887         mutex_init(&jfs_ip->commit_mutex);
 888         init_rwsem(&jfs_ip->xattr_sem);
 889         spin_lock_init(&jfs_ip->ag_lock);
 890         jfs_ip->active_ag = -1;
 891         inode_init_once(&jfs_ip->vfs_inode);
 892 }
 893
 894 static int __init init_jfs_fs(void)
 895 {
 896         int i;
 897         int rc;
 898
 899         jfs_inode_cachep =
 900             kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
 901                             SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|SLAB_ACCOUNT,
 902                             init_once);
 903         if (jfs_inode_cachep == NULL)
 904                 return -ENOMEM;
 905
 906         /*
 907          * Metapage initialization
 908          */
 909         rc = metapage_init();
 910         if (rc) {
 911                 jfs_err("metapage_init failed w/rc = %d", rc);
 912                 goto free_slab;
 913         }
 914
 915         /*
 916          * Transaction Manager initialization
 917          */
 918         rc = txInit();
 919         if (rc) {
 920                 jfs_err("txInit failed w/rc = %d", rc);
 921                 goto free_metapage;
 922         }
 923
 924         /*
 925          * I/O completion thread (endio)
 926          */
 927         jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
 928         if (IS_ERR(jfsIOthread)) {
 929                 rc = PTR_ERR(jfsIOthread);
 930                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
 931                 goto end_txmngr;
 932         }
 933
 934         if (commit_threads < 1)
 935                 commit_threads = num_online_cpus();
 936         if (commit_threads > MAX_COMMIT_THREADS)
 937                 commit_threads = MAX_COMMIT_THREADS;
 938
 939         for (i = 0; i < commit_threads; i++) {
 940                 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL,
 941                                                  "jfsCommit");
 942                 if (IS_ERR(jfsCommitThread[i])) {
 943                         rc = PTR_ERR(jfsCommitThread[i]);
 944                         jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
 945                         commit_threads = i;
 946                         goto kill_committask;
 947                 }
 948         }
 949
 950         jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
 951         if (IS_ERR(jfsSyncThread)) {
 952                 rc = PTR_ERR(jfsSyncThread);
 953                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
 954                 goto kill_committask;
 955         }
 956
 957 #ifdef PROC_FS_JFS
 958         jfs_proc_init();
 959 #endif
 960
 961         rc = register_filesystem(&jfs_fs_type);
 962         if (!rc)
 963                 return 0;
 964
 965 #ifdef PROC_FS_JFS
 966         jfs_proc_clean();
 967 #endif
 968         kthread_stop(jfsSyncThread);
 969 kill_committask:
 970         for (i = 0; i < commit_threads; i++)
 971                 kthread_stop(jfsCommitThread[i]);
 972         kthread_stop(jfsIOthread);
 973 end_txmngr:
 974         txExit();
 975 free_metapage:
 976         metapage_exit();
 977 free_slab:
 978         kmem_cache_destroy(jfs_inode_cachep);
 979         return rc;
 980 }
 981
 982 static void __exit exit_jfs_fs(void)
 983 {
 984         int i;
 985
 986         jfs_info("exit_jfs_fs called");
 987
 988         txExit();
 989         metapage_exit();
 990
 991         kthread_stop(jfsIOthread);
 992         for (i = 0; i < commit_threads; i++)
 993                 kthread_stop(jfsCommitThread[i]);
 994         kthread_stop(jfsSyncThread);
 995 #ifdef PROC_FS_JFS
 996         jfs_proc_clean();
 997 #endif
 998         unregister_filesystem(&jfs_fs_type);
 999
1000         /*
1001          * Make sure all delayed rcu free inodes are flushed before we
1002          * destroy cache.
1003          */
1004         rcu_barrier();
1005         kmem_cache_destroy(jfs_inode_cachep);
1006 }
1007
1008 module_init(init_jfs_fs)
1009 module_exit(exit_jfs_fs)