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): %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         if (!new_valid_dev(sb->s_bdev->bd_dev))
 500                 return -EOVERFLOW;
 501
 502         sbi = kzalloc(sizeof(struct jfs_sb_info), GFP_KERNEL);
 503         if (!sbi)
 504                 return -ENOMEM;
 505
 506         sb->s_fs_info = sbi;
 507         sb->s_max_links = JFS_LINK_MAX;
 508         sbi->sb = sb;
 509         sbi->uid = INVALID_UID;
 510         sbi->gid = INVALID_GID;
 511         sbi->umask = -1;
 512
 513         /* initialize the mount flag and determine the default error handler */
 514         flag = JFS_ERR_REMOUNT_RO;
 515
 516         if (!parse_options((char *) data, sb, &newLVSize, &flag))
 517                 goto out_kfree;
 518         sbi->flag = flag;
 519
 520 #ifdef CONFIG_JFS_POSIX_ACL
 521         sb->s_flags |= MS_POSIXACL;
 522 #endif
 523
 524         if (newLVSize) {
 525                 pr_err("resize option for remount only\n");
 526                 goto out_kfree;
 527         }
 528
 529         /*
 530          * Initialize blocksize to 4K.
 531          */
 532         sb_set_blocksize(sb, PSIZE);
 533
 534         /*
 535          * Set method vectors.
 536          */
 537         sb->s_op = &jfs_super_operations;
 538         sb->s_export_op = &jfs_export_operations;
 539         sb->s_xattr = jfs_xattr_handlers;
 540 #ifdef CONFIG_QUOTA
 541         sb->dq_op = &dquot_operations;
 542         sb->s_qcop = &dquot_quotactl_ops;
 543         sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
 544 #endif
 545
 546         /*
 547          * Initialize direct-mapping inode/address-space
 548          */
 549         inode = new_inode(sb);
 550         if (inode == NULL) {
 551                 ret = -ENOMEM;
 552                 goto out_unload;
 553         }
 554         inode->i_ino = 0;
 555         inode->i_size = sb->s_bdev->bd_inode->i_size;
 556         inode->i_mapping->a_ops = &jfs_metapage_aops;
 557         hlist_add_fake(&inode->i_hash);
 558         mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
 559
 560         sbi->direct_inode = inode;
 561
 562         rc = jfs_mount(sb);
 563         if (rc) {
 564                 if (!silent)
 565                         jfs_err("jfs_mount failed w/return code = %d", rc);
 566                 goto out_mount_failed;
 567         }
 568         if (sb->s_flags & MS_RDONLY)
 569                 sbi->log = NULL;
 570         else {
 571                 rc = jfs_mount_rw(sb, 0);
 572                 if (rc) {
 573                         if (!silent) {
 574                                 jfs_err("jfs_mount_rw failed, return code = %d",
 575                                         rc);
 576                         }
 577                         goto out_no_rw;
 578                 }
 579         }
 580
 581         sb->s_magic = JFS_SUPER_MAGIC;
 582
 583         if (sbi->mntflag & JFS_OS2)
 584                 sb->s_d_op = &jfs_ci_dentry_operations;
 585
 586         inode = jfs_iget(sb, ROOT_I);
 587         if (IS_ERR(inode)) {
 588                 ret = PTR_ERR(inode);
 589                 goto out_no_rw;
 590         }
 591         sb->s_root = d_make_root(inode);
 592         if (!sb->s_root)
 593                 goto out_no_root;
 594
 595         /* logical blocks are represented by 40 bits in pxd_t, etc. */
 596         sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
 597 #if BITS_PER_LONG == 32
 598         /*
 599          * Page cache is indexed by long.
 600          * I would use MAX_LFS_FILESIZE, but it's only half as big
 601          */
 602         sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1,
 603                              (u64)sb->s_maxbytes);
 604 #endif
 605         sb->s_time_gran = 1;
 606         return 0;
 607
 608 out_no_root:
 609         jfs_err("jfs_read_super: get root dentry failed");
 610
 611 out_no_rw:
 612         rc = jfs_umount(sb);
 613         if (rc)
 614                 jfs_err("jfs_umount failed with return code %d", rc);
 615 out_mount_failed:
 616         filemap_write_and_wait(sbi->direct_inode->i_mapping);
 617         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
 618         make_bad_inode(sbi->direct_inode);
 619         iput(sbi->direct_inode);
 620         sbi->direct_inode = NULL;
 621 out_unload:
 622         unload_nls(sbi->nls_tab);
 623 out_kfree:
 624         kfree(sbi);
 625         return ret;
 626 }
 627
 628 static int jfs_freeze(struct super_block *sb)
 629 {
 630         struct jfs_sb_info *sbi = JFS_SBI(sb);
 631         struct jfs_log *log = sbi->log;
 632         int rc = 0;
 633
 634         if (!(sb->s_flags & MS_RDONLY)) {
 635                 txQuiesce(sb);
 636                 rc = lmLogShutdown(log);
 637                 if (rc) {
 638                         jfs_error(sb, "lmLogShutdown failed\n");
 639
 640                         /* let operations fail rather than hang */
 641                         txResume(sb);
 642
 643                         return rc;
 644                 }
 645                 rc = updateSuper(sb, FM_CLEAN);
 646                 if (rc) {
 647                         jfs_err("jfs_freeze: updateSuper failed\n");
 648                         /*
 649                          * Don't fail here. Everything succeeded except
 650                          * marking the superblock clean, so there's really
 651                          * no harm in leaving it frozen for now.
 652                          */
 653                 }
 654         }
 655         return 0;
 656 }
 657
 658 static int jfs_unfreeze(struct super_block *sb)
 659 {
 660         struct jfs_sb_info *sbi = JFS_SBI(sb);
 661         struct jfs_log *log = sbi->log;
 662         int rc = 0;
 663
 664         if (!(sb->s_flags & MS_RDONLY)) {
 665                 rc = updateSuper(sb, FM_MOUNT);
 666                 if (rc) {
 667                         jfs_error(sb, "updateSuper failed\n");
 668                         goto out;
 669                 }
 670                 rc = lmLogInit(log);
 671                 if (rc)
 672                         jfs_error(sb, "lmLogInit failed\n");
 673 out:
 674                 txResume(sb);
 675         }
 676         return rc;
 677 }
 678
 679 static struct dentry *jfs_do_mount(struct file_system_type *fs_type,
 680         int flags, const char *dev_name, void *data)
 681 {
 682         return mount_bdev(fs_type, flags, dev_name, data, jfs_fill_super);
 683 }
 684
 685 static int jfs_sync_fs(struct super_block *sb, int wait)
 686 {
 687         struct jfs_log *log = JFS_SBI(sb)->log;
 688
 689         /* log == NULL indicates read-only mount */
 690         if (log) {
 691                 /*
 692                  * Write quota structures to quota file, sync_blockdev() will
 693                  * write them to disk later
 694                  */
 695                 dquot_writeback_dquots(sb, -1);
 696                 jfs_flush_journal(log, wait);
 697                 jfs_syncpt(log, 0);
 698         }
 699
 700         return 0;
 701 }
 702
 703 static int jfs_show_options(struct seq_file *seq, struct dentry *root)
 704 {
 705         struct jfs_sb_info *sbi = JFS_SBI(root->d_sb);
 706
 707         if (uid_valid(sbi->uid))
 708                 seq_printf(seq, ",uid=%d", from_kuid(&init_user_ns, sbi->uid));
 709         if (gid_valid(sbi->gid))
 710                 seq_printf(seq, ",gid=%d", from_kgid(&init_user_ns, sbi->gid));
 711         if (sbi->umask != -1)
 712                 seq_printf(seq, ",umask=%03o", sbi->umask);
 713         if (sbi->flag & JFS_NOINTEGRITY)
 714                 seq_puts(seq, ",nointegrity");
 715         if (sbi->flag & JFS_DISCARD)
 716                 seq_printf(seq, ",discard=%u", sbi->minblks_trim);
 717         if (sbi->nls_tab)
 718                 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset);
 719         if (sbi->flag & JFS_ERR_CONTINUE)
 720                 seq_printf(seq, ",errors=continue");
 721         if (sbi->flag & JFS_ERR_PANIC)
 722                 seq_printf(seq, ",errors=panic");
 723
 724 #ifdef CONFIG_QUOTA
 725         if (sbi->flag & JFS_USRQUOTA)
 726                 seq_puts(seq, ",usrquota");
 727
 728         if (sbi->flag & JFS_GRPQUOTA)
 729                 seq_puts(seq, ",grpquota");
 730 #endif
 731
 732         return 0;
 733 }
 734
 735 #ifdef CONFIG_QUOTA
 736
 737 /* Read data from quotafile - avoid pagecache and such because we cannot afford
 738  * acquiring the locks... As quota files are never truncated and quota code
 739  * itself serializes the operations (and no one else should touch the files)
 740  * we don't have to be afraid of races */
 741 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
 742                               size_t len, loff_t off)
 743 {
 744         struct inode *inode = sb_dqopt(sb)->files[type];
 745         sector_t blk = off >> sb->s_blocksize_bits;
 746         int err = 0;
 747         int offset = off & (sb->s_blocksize - 1);
 748         int tocopy;
 749         size_t toread;
 750         struct buffer_head tmp_bh;
 751         struct buffer_head *bh;
 752         loff_t i_size = i_size_read(inode);
 753
 754         if (off > i_size)
 755                 return 0;
 756         if (off+len > i_size)
 757                 len = i_size-off;
 758         toread = len;
 759         while (toread > 0) {
 760                 tocopy = sb->s_blocksize - offset < toread ?
 761                                 sb->s_blocksize - offset : toread;
 762
 763                 tmp_bh.b_state = 0;
 764                 tmp_bh.b_size = 1 << inode->i_blkbits;
 765                 err = jfs_get_block(inode, blk, &tmp_bh, 0);
 766                 if (err)
 767                         return err;
 768                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
 769                         memset(data, 0, tocopy);
 770                 else {
 771                         bh = sb_bread(sb, tmp_bh.b_blocknr);
 772                         if (!bh)
 773                                 return -EIO;
 774                         memcpy(data, bh->b_data+offset, tocopy);
 775                         brelse(bh);
 776                 }
 777                 offset = 0;
 778                 toread -= tocopy;
 779                 data += tocopy;
 780                 blk++;
 781         }
 782         return len;
 783 }
 784
 785 /* Write to quotafile */
 786 static ssize_t jfs_quota_write(struct super_block *sb, int type,
 787                                const char *data, size_t len, loff_t off)
 788 {
 789         struct inode *inode = sb_dqopt(sb)->files[type];
 790         sector_t blk = off >> sb->s_blocksize_bits;
 791         int err = 0;
 792         int offset = off & (sb->s_blocksize - 1);
 793         int tocopy;
 794         size_t towrite = len;
 795         struct buffer_head tmp_bh;
 796         struct buffer_head *bh;
 797
 798         mutex_lock(&inode->i_mutex);
 799         while (towrite > 0) {
 800                 tocopy = sb->s_blocksize - offset < towrite ?
 801                                 sb->s_blocksize - offset : towrite;
 802
 803                 tmp_bh.b_state = 0;
 804                 tmp_bh.b_size = 1 << inode->i_blkbits;
 805                 err = jfs_get_block(inode, blk, &tmp_bh, 1);
 806                 if (err)
 807                         goto out;
 808                 if (offset || tocopy != sb->s_blocksize)
 809                         bh = sb_bread(sb, tmp_bh.b_blocknr);
 810                 else
 811                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
 812                 if (!bh) {
 813                         err = -EIO;
 814                         goto out;
 815                 }
 816                 lock_buffer(bh);
 817                 memcpy(bh->b_data+offset, data, tocopy);
 818                 flush_dcache_page(bh->b_page);
 819                 set_buffer_uptodate(bh);
 820                 mark_buffer_dirty(bh);
 821                 unlock_buffer(bh);
 822                 brelse(bh);
 823                 offset = 0;
 824                 towrite -= tocopy;
 825                 data += tocopy;
 826                 blk++;
 827         }
 828 out:
 829         if (len == towrite) {
 830                 mutex_unlock(&inode->i_mutex);
 831                 return err;
 832         }
 833         if (inode->i_size < off+len-towrite)
 834                 i_size_write(inode, off+len-towrite);
 835         inode->i_version++;
 836         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
 837         mark_inode_dirty(inode);
 838         mutex_unlock(&inode->i_mutex);
 839         return len - towrite;
 840 }
 841
 842 static struct dquot **jfs_get_dquots(struct inode *inode)
 843 {
 844         return JFS_IP(inode)->i_dquot;
 845 }
 846 #endif
 847
 848 static const struct super_operations jfs_super_operations = {
 849         .alloc_inode    = jfs_alloc_inode,
 850         .destroy_inode  = jfs_destroy_inode,
 851         .dirty_inode    = jfs_dirty_inode,
 852         .write_inode    = jfs_write_inode,
 853         .evict_inode    = jfs_evict_inode,
 854         .put_super      = jfs_put_super,
 855         .sync_fs        = jfs_sync_fs,
 856         .freeze_fs      = jfs_freeze,
 857         .unfreeze_fs    = jfs_unfreeze,
 858         .statfs         = jfs_statfs,
 859         .remount_fs     = jfs_remount,
 860         .show_options   = jfs_show_options,
 861 #ifdef CONFIG_QUOTA
 862         .quota_read     = jfs_quota_read,
 863         .quota_write    = jfs_quota_write,
 864         .get_dquots     = jfs_get_dquots,
 865 #endif
 866 };
 867
 868 static const struct export_operations jfs_export_operations = {
 869         .fh_to_dentry   = jfs_fh_to_dentry,
 870         .fh_to_parent   = jfs_fh_to_parent,
 871         .get_parent     = jfs_get_parent,
 872 };
 873
 874 static struct file_system_type jfs_fs_type = {
 875         .owner          = THIS_MODULE,
 876         .name           = "jfs",
 877         .mount          = jfs_do_mount,
 878         .kill_sb        = kill_block_super,
 879         .fs_flags       = FS_REQUIRES_DEV,
 880 };
 881 MODULE_ALIAS_FS("jfs");
 882
 883 static void init_once(void *foo)
 884 {
 885         struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
 886
 887         memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
 888         INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
 889         init_rwsem(&jfs_ip->rdwrlock);
 890         mutex_init(&jfs_ip->commit_mutex);
 891         init_rwsem(&jfs_ip->xattr_sem);
 892         spin_lock_init(&jfs_ip->ag_lock);
 893         jfs_ip->active_ag = -1;
 894         inode_init_once(&jfs_ip->vfs_inode);
 895 }
 896
 897 static int __init init_jfs_fs(void)
 898 {
 899         int i;
 900         int rc;
 901
 902         jfs_inode_cachep =
 903             kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
 904                             SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
 905                             init_once);
 906         if (jfs_inode_cachep == NULL)
 907                 return -ENOMEM;
 908
 909         /*
 910          * Metapage initialization
 911          */
 912         rc = metapage_init();
 913         if (rc) {
 914                 jfs_err("metapage_init failed w/rc = %d", rc);
 915                 goto free_slab;
 916         }
 917
 918         /*
 919          * Transaction Manager initialization
 920          */
 921         rc = txInit();
 922         if (rc) {
 923                 jfs_err("txInit failed w/rc = %d", rc);
 924                 goto free_metapage;
 925         }
 926
 927         /*
 928          * I/O completion thread (endio)
 929          */
 930         jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
 931         if (IS_ERR(jfsIOthread)) {
 932                 rc = PTR_ERR(jfsIOthread);
 933                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
 934                 goto end_txmngr;
 935         }
 936
 937         if (commit_threads < 1)
 938                 commit_threads = num_online_cpus();
 939         if (commit_threads > MAX_COMMIT_THREADS)
 940                 commit_threads = MAX_COMMIT_THREADS;
 941
 942         for (i = 0; i < commit_threads; i++) {
 943                 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL,
 944                                                  "jfsCommit");
 945                 if (IS_ERR(jfsCommitThread[i])) {
 946                         rc = PTR_ERR(jfsCommitThread[i]);
 947                         jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
 948                         commit_threads = i;
 949                         goto kill_committask;
 950                 }
 951         }
 952
 953         jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
 954         if (IS_ERR(jfsSyncThread)) {
 955                 rc = PTR_ERR(jfsSyncThread);
 956                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
 957                 goto kill_committask;
 958         }
 959
 960 #ifdef PROC_FS_JFS
 961         jfs_proc_init();
 962 #endif
 963
 964         rc = register_filesystem(&jfs_fs_type);
 965         if (!rc)
 966                 return 0;
 967
 968 #ifdef PROC_FS_JFS
 969         jfs_proc_clean();
 970 #endif
 971         kthread_stop(jfsSyncThread);
 972 kill_committask:
 973         for (i = 0; i < commit_threads; i++)
 974                 kthread_stop(jfsCommitThread[i]);
 975         kthread_stop(jfsIOthread);
 976 end_txmngr:
 977         txExit();
 978 free_metapage:
 979         metapage_exit();
 980 free_slab:
 981         kmem_cache_destroy(jfs_inode_cachep);
 982         return rc;
 983 }
 984
 985 static void __exit exit_jfs_fs(void)
 986 {
 987         int i;
 988
 989         jfs_info("exit_jfs_fs called");
 990
 991         txExit();
 992         metapage_exit();
 993
 994         kthread_stop(jfsIOthread);
 995         for (i = 0; i < commit_threads; i++)
 996                 kthread_stop(jfsCommitThread[i]);
 997         kthread_stop(jfsSyncThread);
 998 #ifdef PROC_FS_JFS
 999         jfs_proc_clean();
1000 #endif
1001         unregister_filesystem(&jfs_fs_type);
1002
1003         /*
1004          * Make sure all delayed rcu free inodes are flushed before we
1005          * destroy cache.
1006          */
1007         rcu_barrier();
1008         kmem_cache_destroy(jfs_inode_cachep);
1009 }
1010
1011 module_init(init_jfs_fs)
1012 module_exit(exit_jfs_fs)