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\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 *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): %pf: %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         return &jfs_inode->vfs_inode;
 121 }
 122
 123 static void jfs_i_callback(struct rcu_head *head)
 124 {
 125         struct inode *inode = container_of(head, struct inode, i_rcu);
 126         struct jfs_inode_info *ji = JFS_IP(inode);
 127         kmem_cache_free(jfs_inode_cachep, ji);
 128 }
 129
 130 static void jfs_destroy_inode(struct inode *inode)
 131 {
 132         struct jfs_inode_info *ji = JFS_IP(inode);
 133
 134         BUG_ON(!list_empty(&ji->anon_inode_list));
 135
 136         spin_lock_irq(&ji->ag_lock);
 137         if (ji->active_ag != -1) {
 138                 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
 139                 atomic_dec(&bmap->db_active[ji->active_ag]);
 140                 ji->active_ag = -1;
 141         }
 142         spin_unlock_irq(&ji->ag_lock);
 143         call_rcu(&inode->i_rcu, jfs_i_callback);
 144 }
 145
 146 static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 147 {
 148         struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb);
 149         s64 maxinodes;
 150         struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
 151
 152         jfs_info("In jfs_statfs");
 153         buf->f_type = JFS_SUPER_MAGIC;
 154         buf->f_bsize = sbi->bsize;
 155         buf->f_blocks = sbi->bmap->db_mapsize;
 156         buf->f_bfree = sbi->bmap->db_nfree;
 157         buf->f_bavail = sbi->bmap->db_nfree;
 158         /*
 159          * If we really return the number of allocated & free inodes, some
 160          * applications will fail because they won't see enough free inodes.
 161          * We'll try to calculate some guess as to how many inodes we can
 162          * really allocate
 163          *
 164          * buf->f_files = atomic_read(&imap->im_numinos);
 165          * buf->f_ffree = atomic_read(&imap->im_numfree);
 166          */
 167         maxinodes = min((s64) atomic_read(&imap->im_numinos) +
 168                         ((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
 169                          << L2INOSPEREXT), (s64) 0xffffffffLL);
 170         buf->f_files = maxinodes;
 171         buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
 172                                     atomic_read(&imap->im_numfree));
 173         buf->f_fsid.val[0] = (u32)crc32_le(0, sbi->uuid, sizeof(sbi->uuid)/2);
 174         buf->f_fsid.val[1] = (u32)crc32_le(0, sbi->uuid + sizeof(sbi->uuid)/2,
 175                                         sizeof(sbi->uuid)/2);
 176
 177         buf->f_namelen = JFS_NAME_MAX;
 178         return 0;
 179 }
 180
 181 static void jfs_put_super(struct super_block *sb)
 182 {
 183         struct jfs_sb_info *sbi = JFS_SBI(sb);
 184         int rc;
 185
 186         jfs_info("In jfs_put_super");
 187
 188         dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
 189
 190         rc = jfs_umount(sb);
 191         if (rc)
 192                 jfs_err("jfs_umount failed with return code %d", rc);
 193
 194         unload_nls(sbi->nls_tab);
 195
 196         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
 197         iput(sbi->direct_inode);
 198
 199         kfree(sbi);
 200 }
 201
 202 enum {
 203         Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
 204         Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota,
 205         Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask,
 206         Opt_discard, Opt_nodiscard, Opt_discard_minblk
 207 };
 208
 209 static const match_table_t tokens = {
 210         {Opt_integrity, "integrity"},
 211         {Opt_nointegrity, "nointegrity"},
 212         {Opt_iocharset, "iocharset=%s"},
 213         {Opt_resize, "resize=%u"},
 214         {Opt_resize_nosize, "resize"},
 215         {Opt_errors, "errors=%s"},
 216         {Opt_ignore, "noquota"},
 217         {Opt_ignore, "quota"},
 218         {Opt_usrquota, "usrquota"},
 219         {Opt_grpquota, "grpquota"},
 220         {Opt_uid, "uid=%u"},
 221         {Opt_gid, "gid=%u"},
 222         {Opt_umask, "umask=%u"},
 223         {Opt_discard, "discard"},
 224         {Opt_nodiscard, "nodiscard"},
 225         {Opt_discard_minblk, "discard=%u"},
 226         {Opt_err, NULL}
 227 };
 228
 229 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
 230                          int *flag)
 231 {
 232         void *nls_map = (void *)-1;     /* -1: no change;  NULL: none */
 233         char *p;
 234         struct jfs_sb_info *sbi = JFS_SBI(sb);
 235
 236         *newLVSize = 0;
 237
 238         if (!options)
 239                 return 1;
 240
 241         while ((p = strsep(&options, ",")) != NULL) {
 242                 substring_t args[MAX_OPT_ARGS];
 243                 int token;
 244                 if (!*p)
 245                         continue;
 246
 247                 token = match_token(p, tokens, args);
 248                 switch (token) {
 249                 case Opt_integrity:
 250                         *flag &= ~JFS_NOINTEGRITY;
 251                         break;
 252                 case Opt_nointegrity:
 253                         *flag |= JFS_NOINTEGRITY;
 254                         break;
 255                 case Opt_ignore:
 256                         /* Silently ignore the quota options */
 257                         /* Don't do anything ;-) */
 258                         break;
 259                 case Opt_iocharset:
 260                         if (nls_map && nls_map != (void *) -1)
 261                                 unload_nls(nls_map);
 262                         if (!strcmp(args[0].from, "none"))
 263                                 nls_map = NULL;
 264                         else {
 265                                 nls_map = load_nls(args[0].from);
 266                                 if (!nls_map) {
 267                                         pr_err("JFS: charset not found\n");
 268                                         goto cleanup;
 269                                 }
 270                         }
 271                         break;
 272                 case Opt_resize:
 273                 {
 274                         char *resize = args[0].from;
 275                         int rc = kstrtoll(resize, 0, newLVSize);
 276
 277                         if (rc)
 278                                 goto cleanup;
 279                         break;
 280                 }
 281                 case Opt_resize_nosize:
 282                 {
 283                         *newLVSize = sb->s_bdev->bd_inode->i_size >>
 284                                 sb->s_blocksize_bits;
 285                         if (*newLVSize == 0)
 286                                 pr_err("JFS: Cannot determine volume size\n");
 287                         break;
 288                 }
 289                 case Opt_errors:
 290                 {
 291                         char *errors = args[0].from;
 292                         if (!errors || !*errors)
 293                                 goto cleanup;
 294                         if (!strcmp(errors, "continue")) {
 295                                 *flag &= ~JFS_ERR_REMOUNT_RO;
 296                                 *flag &= ~JFS_ERR_PANIC;
 297                                 *flag |= JFS_ERR_CONTINUE;
 298                         } else if (!strcmp(errors, "remount-ro")) {
 299                                 *flag &= ~JFS_ERR_CONTINUE;
 300                                 *flag &= ~JFS_ERR_PANIC;
 301                                 *flag |= JFS_ERR_REMOUNT_RO;
 302                         } else if (!strcmp(errors, "panic")) {
 303                                 *flag &= ~JFS_ERR_CONTINUE;
 304                                 *flag &= ~JFS_ERR_REMOUNT_RO;
 305                                 *flag |= JFS_ERR_PANIC;
 306                         } else {
 307                                 pr_err("JFS: %s is an invalid error handler\n",
 308                                        errors);
 309                                 goto cleanup;
 310                         }
 311                         break;
 312                 }
 313
 314 #ifdef CONFIG_QUOTA
 315                 case Opt_quota:
 316                 case Opt_usrquota:
 317                         *flag |= JFS_USRQUOTA;
 318                         break;
 319                 case Opt_grpquota:
 320                         *flag |= JFS_GRPQUOTA;
 321                         break;
 322 #else
 323                 case Opt_usrquota:
 324                 case Opt_grpquota:
 325                 case Opt_quota:
 326                         pr_err("JFS: quota operations not supported\n");
 327                         break;
 328 #endif
 329                 case Opt_uid:
 330                 {
 331                         char *uid = args[0].from;
 332                         uid_t val;
 333                         int rc = kstrtouint(uid, 0, &val);
 334
 335                         if (rc)
 336                                 goto cleanup;
 337                         sbi->uid = make_kuid(current_user_ns(), val);
 338                         if (!uid_valid(sbi->uid))
 339                                 goto cleanup;
 340                         break;
 341                 }
 342
 343                 case Opt_gid:
 344                 {
 345                         char *gid = args[0].from;
 346                         gid_t val;
 347                         int rc = kstrtouint(gid, 0, &val);
 348
 349                         if (rc)
 350                                 goto cleanup;
 351                         sbi->gid = make_kgid(current_user_ns(), val);
 352                         if (!gid_valid(sbi->gid))
 353                                 goto cleanup;
 354                         break;
 355                 }
 356
 357                 case Opt_umask:
 358                 {
 359                         char *umask = args[0].from;
 360                         int rc = kstrtouint(umask, 8, &sbi->umask);
 361
 362                         if (rc)
 363                                 goto cleanup;
 364                         if (sbi->umask & ~0777) {
 365                                 pr_err("JFS: Invalid value of umask\n");
 366                                 goto cleanup;
 367                         }
 368                         break;
 369                 }
 370
 371                 case Opt_discard:
 372                 {
 373                         struct request_queue *q = bdev_get_queue(sb->s_bdev);
 374                         /* if set to 1, even copying files will cause
 375                          * trimming :O
 376                          * -> user has more control over the online trimming
 377                          */
 378                         sbi->minblks_trim = 64;
 379                         if (blk_queue_discard(q))
 380                                 *flag |= JFS_DISCARD;
 381                         else
 382                                 pr_err("JFS: discard option not supported on device\n");
 383                         break;
 384                 }
 385
 386                 case Opt_nodiscard:
 387                         *flag &= ~JFS_DISCARD;
 388                         break;
 389
 390                 case Opt_discard_minblk:
 391                 {
 392                         struct request_queue *q = bdev_get_queue(sb->s_bdev);
 393                         char *minblks_trim = args[0].from;
 394                         int rc;
 395                         if (blk_queue_discard(q)) {
 396                                 *flag |= JFS_DISCARD;
 397                                 rc = kstrtouint(minblks_trim, 0,
 398                                                 &sbi->minblks_trim);
 399                                 if (rc)
 400                                         goto cleanup;
 401                         } else
 402                                 pr_err("JFS: discard option not supported on device\n");
 403                         break;
 404                 }
 405
 406                 default:
 407                         printk("jfs: Unrecognized mount option \"%s\" or missing value\n",
 408                                p);
 409                         goto cleanup;
 410                 }
 411         }
 412
 413         if (nls_map != (void *) -1) {
 414                 /* Discard old (if remount) */
 415                 unload_nls(sbi->nls_tab);
 416                 sbi->nls_tab = nls_map;
 417         }
 418         return 1;
 419
 420 cleanup:
 421         if (nls_map && nls_map != (void *) -1)
 422                 unload_nls(nls_map);
 423         return 0;
 424 }
 425
 426 static int jfs_remount(struct super_block *sb, int *flags, char *data)
 427 {
 428         s64 newLVSize = 0;
 429         int rc = 0;
 430         int flag = JFS_SBI(sb)->flag;
 431         int ret;
 432
 433         sync_filesystem(sb);
 434         if (!parse_options(data, sb, &newLVSize, &flag))
 435                 return -EINVAL;
 436
 437         if (newLVSize) {
 438                 if (sb->s_flags & MS_RDONLY) {
 439                         pr_err("JFS: resize requires volume to be mounted read-write\n");
 440                         return -EROFS;
 441                 }
 442                 rc = jfs_extendfs(sb, newLVSize, 0);
 443                 if (rc)
 444                         return rc;
 445         }
 446
 447         if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
 448                 /*
 449                  * Invalidate any previously read metadata.  fsck may have
 450                  * changed the on-disk data since we mounted r/o
 451                  */
 452                 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
 453
 454                 JFS_SBI(sb)->flag = flag;
 455                 ret = jfs_mount_rw(sb, 1);
 456
 457                 /* mark the fs r/w for quota activity */
 458                 sb->s_flags &= ~MS_RDONLY;
 459
 460                 dquot_resume(sb, -1);
 461                 return ret;
 462         }
 463         if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
 464                 rc = dquot_suspend(sb, -1);
 465                 if (rc < 0)
 466                         return rc;
 467                 rc = jfs_umount_rw(sb);
 468                 JFS_SBI(sb)->flag = flag;
 469                 return rc;
 470         }
 471         if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
 472                 if (!(sb->s_flags & MS_RDONLY)) {
 473                         rc = jfs_umount_rw(sb);
 474                         if (rc)
 475                                 return rc;
 476
 477                         JFS_SBI(sb)->flag = flag;
 478                         ret = jfs_mount_rw(sb, 1);
 479                         return ret;
 480                 }
 481         JFS_SBI(sb)->flag = flag;
 482
 483         return 0;
 484 }
 485
 486 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
 487 {
 488         struct jfs_sb_info *sbi;
 489         struct inode *inode;
 490         int rc;
 491         s64 newLVSize = 0;
 492         int flag, ret = -EINVAL;
 493
 494         jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
 495
 496         if (!new_valid_dev(sb->s_bdev->bd_dev))
 497                 return -EOVERFLOW;
 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 #endif
 541
 542         /*
 543          * Initialize direct-mapping inode/address-space
 544          */
 545         inode = new_inode(sb);
 546         if (inode == NULL) {
 547                 ret = -ENOMEM;
 548                 goto out_unload;
 549         }
 550         inode->i_ino = 0;
 551         inode->i_size = sb->s_bdev->bd_inode->i_size;
 552         inode->i_mapping->a_ops = &jfs_metapage_aops;
 553         insert_inode_hash(inode);
 554         mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
 555
 556         sbi->direct_inode = inode;
 557
 558         rc = jfs_mount(sb);
 559         if (rc) {
 560                 if (!silent)
 561                         jfs_err("jfs_mount failed w/return code = %d", rc);
 562                 goto out_mount_failed;
 563         }
 564         if (sb->s_flags & MS_RDONLY)
 565                 sbi->log = NULL;
 566         else {
 567                 rc = jfs_mount_rw(sb, 0);
 568                 if (rc) {
 569                         if (!silent) {
 570                                 jfs_err("jfs_mount_rw failed, return code = %d",
 571                                         rc);
 572                         }
 573                         goto out_no_rw;
 574                 }
 575         }
 576
 577         sb->s_magic = JFS_SUPER_MAGIC;
 578
 579         if (sbi->mntflag & JFS_OS2)
 580                 sb->s_d_op = &jfs_ci_dentry_operations;
 581
 582         inode = jfs_iget(sb, ROOT_I);
 583         if (IS_ERR(inode)) {
 584                 ret = PTR_ERR(inode);
 585                 goto out_no_rw;
 586         }
 587         sb->s_root = d_make_root(inode);
 588         if (!sb->s_root)
 589                 goto out_no_root;
 590
 591         /* logical blocks are represented by 40 bits in pxd_t, etc. */
 592         sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
 593 #if BITS_PER_LONG == 32
 594         /*
 595          * Page cache is indexed by long.
 596          * I would use MAX_LFS_FILESIZE, but it's only half as big
 597          */
 598         sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1,
 599                              (u64)sb->s_maxbytes);
 600 #endif
 601         sb->s_time_gran = 1;
 602         return 0;
 603
 604 out_no_root:
 605         jfs_err("jfs_read_super: get root dentry failed");
 606
 607 out_no_rw:
 608         rc = jfs_umount(sb);
 609         if (rc)
 610                 jfs_err("jfs_umount failed with return code %d", rc);
 611 out_mount_failed:
 612         filemap_write_and_wait(sbi->direct_inode->i_mapping);
 613         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
 614         make_bad_inode(sbi->direct_inode);
 615         iput(sbi->direct_inode);
 616         sbi->direct_inode = NULL;
 617 out_unload:
 618         if (sbi->nls_tab)
 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\n");
 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         mutex_lock(&inode->i_mutex);
 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                 mutex_unlock(&inode->i_mutex);
 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;
 834         mark_inode_dirty(inode);
 835         mutex_unlock(&inode->i_mutex);
 836         return len - towrite;
 837 }
 838
 839 #endif
 840
 841 static const struct super_operations jfs_super_operations = {
 842         .alloc_inode    = jfs_alloc_inode,
 843         .destroy_inode  = jfs_destroy_inode,
 844         .dirty_inode    = jfs_dirty_inode,
 845         .write_inode    = jfs_write_inode,
 846         .evict_inode    = jfs_evict_inode,
 847         .put_super      = jfs_put_super,
 848         .sync_fs        = jfs_sync_fs,
 849         .freeze_fs      = jfs_freeze,
 850         .unfreeze_fs    = jfs_unfreeze,
 851         .statfs         = jfs_statfs,
 852         .remount_fs     = jfs_remount,
 853         .show_options   = jfs_show_options,
 854 #ifdef CONFIG_QUOTA
 855         .quota_read     = jfs_quota_read,
 856         .quota_write    = jfs_quota_write,
 857 #endif
 858 };
 859
 860 static const struct export_operations jfs_export_operations = {
 861         .fh_to_dentry   = jfs_fh_to_dentry,
 862         .fh_to_parent   = jfs_fh_to_parent,
 863         .get_parent     = jfs_get_parent,
 864 };
 865
 866 static struct file_system_type jfs_fs_type = {
 867         .owner          = THIS_MODULE,
 868         .name           = "jfs",
 869         .mount          = jfs_do_mount,
 870         .kill_sb        = kill_block_super,
 871         .fs_flags       = FS_REQUIRES_DEV,
 872 };
 873 MODULE_ALIAS_FS("jfs");
 874
 875 static void init_once(void *foo)
 876 {
 877         struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
 878
 879         memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
 880         INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
 881         init_rwsem(&jfs_ip->rdwrlock);
 882         mutex_init(&jfs_ip->commit_mutex);
 883         init_rwsem(&jfs_ip->xattr_sem);
 884         spin_lock_init(&jfs_ip->ag_lock);
 885         jfs_ip->active_ag = -1;
 886         inode_init_once(&jfs_ip->vfs_inode);
 887 }
 888
 889 static int __init init_jfs_fs(void)
 890 {
 891         int i;
 892         int rc;
 893
 894         jfs_inode_cachep =
 895             kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
 896                             SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
 897                             init_once);
 898         if (jfs_inode_cachep == NULL)
 899                 return -ENOMEM;
 900
 901         /*
 902          * Metapage initialization
 903          */
 904         rc = metapage_init();
 905         if (rc) {
 906                 jfs_err("metapage_init failed w/rc = %d", rc);
 907                 goto free_slab;
 908         }
 909
 910         /*
 911          * Transaction Manager initialization
 912          */
 913         rc = txInit();
 914         if (rc) {
 915                 jfs_err("txInit failed w/rc = %d", rc);
 916                 goto free_metapage;
 917         }
 918
 919         /*
 920          * I/O completion thread (endio)
 921          */
 922         jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
 923         if (IS_ERR(jfsIOthread)) {
 924                 rc = PTR_ERR(jfsIOthread);
 925                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
 926                 goto end_txmngr;
 927         }
 928
 929         if (commit_threads < 1)
 930                 commit_threads = num_online_cpus();
 931         if (commit_threads > MAX_COMMIT_THREADS)
 932                 commit_threads = MAX_COMMIT_THREADS;
 933
 934         for (i = 0; i < commit_threads; i++) {
 935                 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL,
 936                                                  "jfsCommit");
 937                 if (IS_ERR(jfsCommitThread[i])) {
 938                         rc = PTR_ERR(jfsCommitThread[i]);
 939                         jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
 940                         commit_threads = i;
 941                         goto kill_committask;
 942                 }
 943         }
 944
 945         jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
 946         if (IS_ERR(jfsSyncThread)) {
 947                 rc = PTR_ERR(jfsSyncThread);
 948                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
 949                 goto kill_committask;
 950         }
 951
 952 #ifdef PROC_FS_JFS
 953         jfs_proc_init();
 954 #endif
 955
 956         rc = register_filesystem(&jfs_fs_type);
 957         if (!rc)
 958                 return 0;
 959
 960 #ifdef PROC_FS_JFS
 961         jfs_proc_clean();
 962 #endif
 963         kthread_stop(jfsSyncThread);
 964 kill_committask:
 965         for (i = 0; i < commit_threads; i++)
 966                 kthread_stop(jfsCommitThread[i]);
 967         kthread_stop(jfsIOthread);
 968 end_txmngr:
 969         txExit();
 970 free_metapage:
 971         metapage_exit();
 972 free_slab:
 973         kmem_cache_destroy(jfs_inode_cachep);
 974         return rc;
 975 }
 976
 977 static void __exit exit_jfs_fs(void)
 978 {
 979         int i;
 980
 981         jfs_info("exit_jfs_fs called");
 982
 983         txExit();
 984         metapage_exit();
 985
 986         kthread_stop(jfsIOthread);
 987         for (i = 0; i < commit_threads; i++)
 988                 kthread_stop(jfsCommitThread[i]);
 989         kthread_stop(jfsSyncThread);
 990 #ifdef PROC_FS_JFS
 991         jfs_proc_clean();
 992 #endif
 993         unregister_filesystem(&jfs_fs_type);
 994
 995         /*
 996          * Make sure all delayed rcu free inodes are flushed before we
 997          * destroy cache.
 998          */
 999         rcu_barrier();
1000         kmem_cache_destroy(jfs_inode_cachep);
1001 }
1002
1003 module_init(init_jfs_fs)
1004 module_exit(exit_jfs_fs)