fs/jfs/super.c

   1 /*
   2  *   Copyright (C) International Business Machines Corp., 2000-2004
   3  *   Portions Copyright (C) Christoph Hellwig, 2001-2002
   4  *
   5  *   This program is free software;  you can redistribute it and/or modify
   6  *   it under the terms of the GNU General Public License as published by
   7  *   the Free Software Foundation; either version 2 of the License, or
   8  *   (at your option) any later version.
   9  *
  10  *   This program is distributed in the hope that it will be useful,
  11  *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  13  *   the GNU General Public License for more details.
  14  *
  15  *   You should have received a copy of the GNU General Public License
  16  *   along with this program;  if not, write to the Free Software
  17  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  18  */
  19
  20 #include <linux/fs.h>
  21 #include <linux/module.h>
  22 #include <linux/parser.h>
  23 #include <linux/completion.h>
  24 #include <linux/vfs.h>
  25 #include <linux/quotaops.h>
  26 #include <linux/mount.h>
  27 #include <linux/moduleparam.h>
  28 #include <linux/kthread.h>
  29 #include <linux/posix_acl.h>
  30 #include <linux/buffer_head.h>
  31 #include <linux/exportfs.h>
  32 #include <linux/crc32.h>
  33 #include <linux/slab.h>
  34 #include <asm/uaccess.h>
  35 #include <linux/seq_file.h>
  36 #include <linux/blkdev.h>
  37
  38 #include "jfs_incore.h"
  39 #include "jfs_filsys.h"
  40 #include "jfs_inode.h"
  41 #include "jfs_metapage.h"
  42 #include "jfs_superblock.h"
  43 #include "jfs_dmap.h"
  44 #include "jfs_imap.h"
  45 #include "jfs_acl.h"
  46 #include "jfs_debug.h"
  47
  48 MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
  49 MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
  50 MODULE_LICENSE("GPL");
  51
  52 static struct kmem_cache * jfs_inode_cachep;
  53
  54 static const struct super_operations jfs_super_operations;
  55 static const struct export_operations jfs_export_operations;
  56 static struct file_system_type jfs_fs_type;
  57
  58 #define MAX_COMMIT_THREADS 64
  59 static int commit_threads = 0;
  60 module_param(commit_threads, int, 0);
  61 MODULE_PARM_DESC(commit_threads, "Number of commit threads");
  62
  63 static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS];
  64 struct task_struct *jfsIOthread;
  65 struct task_struct *jfsSyncThread;
  66
  67 #ifdef CONFIG_JFS_DEBUG
  68 int jfsloglevel = JFS_LOGLEVEL_WARN;
  69 module_param(jfsloglevel, int, 0644);
  70 MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
  71 #endif
  72
  73 static void jfs_handle_error(struct super_block *sb)
  74 {
  75         struct jfs_sb_info *sbi = JFS_SBI(sb);
  76
  77         if (sb->s_flags & MS_RDONLY)
  78                 return;
  79
  80         updateSuper(sb, FM_DIRTY);
  81
  82         if (sbi->flag & JFS_ERR_PANIC)
  83                 panic("JFS (device %s): panic forced after error\n",
  84                         sb->s_id);
  85         else if (sbi->flag & JFS_ERR_REMOUNT_RO) {
  86                 jfs_err("ERROR: (device %s): remounting filesystem "
  87                         "as read-only\n",
  88                         sb->s_id);
  89                 sb->s_flags |= MS_RDONLY;
  90         }
  91
  92         /* nothing is done for continue beyond marking the superblock dirty */
  93 }
  94
  95 void jfs_error(struct super_block *sb, const char *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                         *newLVSize = simple_strtoull(resize, &resize, 0);
 276                         break;
 277                 }
 278                 case Opt_resize_nosize:
 279                 {
 280                         *newLVSize = sb->s_bdev->bd_inode->i_size >>
 281                                 sb->s_blocksize_bits;
 282                         if (*newLVSize == 0)
 283                                 pr_err("JFS: Cannot determine volume size\n");
 284                         break;
 285                 }
 286                 case Opt_errors:
 287                 {
 288                         char *errors = args[0].from;
 289                         if (!errors || !*errors)
 290                                 goto cleanup;
 291                         if (!strcmp(errors, "continue")) {
 292                                 *flag &= ~JFS_ERR_REMOUNT_RO;
 293                                 *flag &= ~JFS_ERR_PANIC;
 294                                 *flag |= JFS_ERR_CONTINUE;
 295                         } else if (!strcmp(errors, "remount-ro")) {
 296                                 *flag &= ~JFS_ERR_CONTINUE;
 297                                 *flag &= ~JFS_ERR_PANIC;
 298                                 *flag |= JFS_ERR_REMOUNT_RO;
 299                         } else if (!strcmp(errors, "panic")) {
 300                                 *flag &= ~JFS_ERR_CONTINUE;
 301                                 *flag &= ~JFS_ERR_REMOUNT_RO;
 302                                 *flag |= JFS_ERR_PANIC;
 303                         } else {
 304                                 pr_err("JFS: %s is an invalid error handler\n",
 305                                        errors);
 306                                 goto cleanup;
 307                         }
 308                         break;
 309                 }
 310
 311 #ifdef CONFIG_QUOTA
 312                 case Opt_quota:
 313                 case Opt_usrquota:
 314                         *flag |= JFS_USRQUOTA;
 315                         break;
 316                 case Opt_grpquota:
 317                         *flag |= JFS_GRPQUOTA;
 318                         break;
 319 #else
 320                 case Opt_usrquota:
 321                 case Opt_grpquota:
 322                 case Opt_quota:
 323                         pr_err("JFS: quota operations not supported\n");
 324                         break;
 325 #endif
 326                 case Opt_uid:
 327                 {
 328                         char *uid = args[0].from;
 329                         uid_t val = simple_strtoul(uid, &uid, 0);
 330                         sbi->uid = make_kuid(current_user_ns(), val);
 331                         if (!uid_valid(sbi->uid))
 332                                 goto cleanup;
 333                         break;
 334                 }
 335
 336                 case Opt_gid:
 337                 {
 338                         char *gid = args[0].from;
 339                         gid_t val = simple_strtoul(gid, &gid, 0);
 340                         sbi->gid = make_kgid(current_user_ns(), val);
 341                         if (!gid_valid(sbi->gid))
 342                                 goto cleanup;
 343                         break;
 344                 }
 345
 346                 case Opt_umask:
 347                 {
 348                         char *umask = args[0].from;
 349                         sbi->umask = simple_strtoul(umask, &umask, 8);
 350                         if (sbi->umask & ~0777) {
 351                                 pr_err("JFS: Invalid value of umask\n");
 352                                 goto cleanup;
 353                         }
 354                         break;
 355                 }
 356
 357                 case Opt_discard:
 358                 {
 359                         struct request_queue *q = bdev_get_queue(sb->s_bdev);
 360                         /* if set to 1, even copying files will cause
 361                          * trimming :O
 362                          * -> user has more control over the online trimming
 363                          */
 364                         sbi->minblks_trim = 64;
 365                         if (blk_queue_discard(q)) {
 366                                 *flag |= JFS_DISCARD;
 367                         } else {
 368                                 pr_err("JFS: discard option " \
 369                                         "not supported on device\n");
 370                         }
 371                         break;
 372                 }
 373
 374                 case Opt_nodiscard:
 375                         *flag &= ~JFS_DISCARD;
 376                         break;
 377
 378                 case Opt_discard_minblk:
 379                 {
 380                         struct request_queue *q = bdev_get_queue(sb->s_bdev);
 381                         char *minblks_trim = args[0].from;
 382                         if (blk_queue_discard(q)) {
 383                                 *flag |= JFS_DISCARD;
 384                                 sbi->minblks_trim = simple_strtoull(
 385                                         minblks_trim, &minblks_trim, 0);
 386                         } else {
 387                                 pr_err("JFS: discard option " \
 388                                         "not supported on device\n");
 389                         }
 390                         break;
 391                 }
 392
 393                 default:
 394                         printk("jfs: Unrecognized mount option \"%s\" "
 395                                         " or missing value\n", p);
 396                         goto cleanup;
 397                 }
 398         }
 399
 400         if (nls_map != (void *) -1) {
 401                 /* Discard old (if remount) */
 402                 unload_nls(sbi->nls_tab);
 403                 sbi->nls_tab = nls_map;
 404         }
 405         return 1;
 406
 407 cleanup:
 408         if (nls_map && nls_map != (void *) -1)
 409                 unload_nls(nls_map);
 410         return 0;
 411 }
 412
 413 static int jfs_remount(struct super_block *sb, int *flags, char *data)
 414 {
 415         s64 newLVSize = 0;
 416         int rc = 0;
 417         int flag = JFS_SBI(sb)->flag;
 418         int ret;
 419
 420         if (!parse_options(data, sb, &newLVSize, &flag)) {
 421                 return -EINVAL;
 422         }
 423
 424         if (newLVSize) {
 425                 if (sb->s_flags & MS_RDONLY) {
 426                         pr_err("JFS: resize requires volume" \
 427                                 " to be mounted read-write\n");
 428                         return -EROFS;
 429                 }
 430                 rc = jfs_extendfs(sb, newLVSize, 0);
 431                 if (rc)
 432                         return rc;
 433         }
 434
 435         if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
 436                 /*
 437                  * Invalidate any previously read metadata.  fsck may have
 438                  * changed the on-disk data since we mounted r/o
 439                  */
 440                 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
 441
 442                 JFS_SBI(sb)->flag = flag;
 443                 ret = jfs_mount_rw(sb, 1);
 444
 445                 /* mark the fs r/w for quota activity */
 446                 sb->s_flags &= ~MS_RDONLY;
 447
 448                 dquot_resume(sb, -1);
 449                 return ret;
 450         }
 451         if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
 452                 rc = dquot_suspend(sb, -1);
 453                 if (rc < 0) {
 454                         return rc;
 455                 }
 456                 rc = jfs_umount_rw(sb);
 457                 JFS_SBI(sb)->flag = flag;
 458                 return rc;
 459         }
 460         if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
 461                 if (!(sb->s_flags & MS_RDONLY)) {
 462                         rc = jfs_umount_rw(sb);
 463                         if (rc)
 464                                 return rc;
 465
 466                         JFS_SBI(sb)->flag = flag;
 467                         ret = jfs_mount_rw(sb, 1);
 468                         return ret;
 469                 }
 470         JFS_SBI(sb)->flag = flag;
 471
 472         return 0;
 473 }
 474
 475 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
 476 {
 477         struct jfs_sb_info *sbi;
 478         struct inode *inode;
 479         int rc;
 480         s64 newLVSize = 0;
 481         int flag, ret = -EINVAL;
 482
 483         jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
 484
 485         if (!new_valid_dev(sb->s_bdev->bd_dev))
 486                 return -EOVERFLOW;
 487
 488         sbi = kzalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
 489         if (!sbi)
 490                 return -ENOMEM;
 491
 492         sb->s_fs_info = sbi;
 493         sb->s_max_links = JFS_LINK_MAX;
 494         sbi->sb = sb;
 495         sbi->uid = INVALID_UID;
 496         sbi->gid = INVALID_GID;
 497         sbi->umask = -1;
 498
 499         /* initialize the mount flag and determine the default error handler */
 500         flag = JFS_ERR_REMOUNT_RO;
 501
 502         if (!parse_options((char *) data, sb, &newLVSize, &flag))
 503                 goto out_kfree;
 504         sbi->flag = flag;
 505
 506 #ifdef CONFIG_JFS_POSIX_ACL
 507         sb->s_flags |= MS_POSIXACL;
 508 #endif
 509
 510         if (newLVSize) {
 511                 pr_err("resize option for remount only\n");
 512                 goto out_kfree;
 513         }
 514
 515         /*
 516          * Initialize blocksize to 4K.
 517          */
 518         sb_set_blocksize(sb, PSIZE);
 519
 520         /*
 521          * Set method vectors.
 522          */
 523         sb->s_op = &jfs_super_operations;
 524         sb->s_export_op = &jfs_export_operations;
 525 #ifdef CONFIG_QUOTA
 526         sb->dq_op = &dquot_operations;
 527         sb->s_qcop = &dquot_quotactl_ops;
 528 #endif
 529
 530         /*
 531          * Initialize direct-mapping inode/address-space
 532          */
 533         inode = new_inode(sb);
 534         if (inode == NULL) {
 535                 ret = -ENOMEM;
 536                 goto out_unload;
 537         }
 538         inode->i_ino = 0;
 539         inode->i_size = sb->s_bdev->bd_inode->i_size;
 540         inode->i_mapping->a_ops = &jfs_metapage_aops;
 541         insert_inode_hash(inode);
 542         mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
 543
 544         sbi->direct_inode = inode;
 545
 546         rc = jfs_mount(sb);
 547         if (rc) {
 548                 if (!silent) {
 549                         jfs_err("jfs_mount failed w/return code = %d", rc);
 550                 }
 551                 goto out_mount_failed;
 552         }
 553         if (sb->s_flags & MS_RDONLY)
 554                 sbi->log = NULL;
 555         else {
 556                 rc = jfs_mount_rw(sb, 0);
 557                 if (rc) {
 558                         if (!silent) {
 559                                 jfs_err("jfs_mount_rw failed, return code = %d",
 560                                         rc);
 561                         }
 562                         goto out_no_rw;
 563                 }
 564         }
 565
 566         sb->s_magic = JFS_SUPER_MAGIC;
 567
 568         if (sbi->mntflag & JFS_OS2)
 569                 sb->s_d_op = &jfs_ci_dentry_operations;
 570
 571         inode = jfs_iget(sb, ROOT_I);
 572         if (IS_ERR(inode)) {
 573                 ret = PTR_ERR(inode);
 574                 goto out_no_rw;
 575         }
 576         sb->s_root = d_make_root(inode);
 577         if (!sb->s_root)
 578                 goto out_no_root;
 579
 580         /* logical blocks are represented by 40 bits in pxd_t, etc. */
 581         sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
 582 #if BITS_PER_LONG == 32
 583         /*
 584          * Page cache is indexed by long.
 585          * I would use MAX_LFS_FILESIZE, but it's only half as big
 586          */
 587         sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, (u64)sb->s_maxbytes);
 588 #endif
 589         sb->s_time_gran = 1;
 590         return 0;
 591
 592 out_no_root:
 593         jfs_err("jfs_read_super: get root dentry failed");
 594
 595 out_no_rw:
 596         rc = jfs_umount(sb);
 597         if (rc) {
 598                 jfs_err("jfs_umount failed with return code %d", rc);
 599         }
 600 out_mount_failed:
 601         filemap_write_and_wait(sbi->direct_inode->i_mapping);
 602         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
 603         make_bad_inode(sbi->direct_inode);
 604         iput(sbi->direct_inode);
 605         sbi->direct_inode = NULL;
 606 out_unload:
 607         if (sbi->nls_tab)
 608                 unload_nls(sbi->nls_tab);
 609 out_kfree:
 610         kfree(sbi);
 611         return ret;
 612 }
 613
 614 static int jfs_freeze(struct super_block *sb)
 615 {
 616         struct jfs_sb_info *sbi = JFS_SBI(sb);
 617         struct jfs_log *log = sbi->log;
 618         int rc = 0;
 619
 620         if (!(sb->s_flags & MS_RDONLY)) {
 621                 txQuiesce(sb);
 622                 rc = lmLogShutdown(log);
 623                 if (rc) {
 624                         jfs_error(sb, "lmLogShutdown failed\n");
 625
 626                         /* let operations fail rather than hang */
 627                         txResume(sb);
 628
 629                         return rc;
 630                 }
 631                 rc = updateSuper(sb, FM_CLEAN);
 632                 if (rc) {
 633                         jfs_err("jfs_freeze: updateSuper failed\n");
 634                         /*
 635                          * Don't fail here. Everything succeeded except
 636                          * marking the superblock clean, so there's really
 637                          * no harm in leaving it frozen for now.
 638                          */
 639                 }
 640         }
 641         return 0;
 642 }
 643
 644 static int jfs_unfreeze(struct super_block *sb)
 645 {
 646         struct jfs_sb_info *sbi = JFS_SBI(sb);
 647         struct jfs_log *log = sbi->log;
 648         int rc = 0;
 649
 650         if (!(sb->s_flags & MS_RDONLY)) {
 651                 rc = updateSuper(sb, FM_MOUNT);
 652                 if (rc) {
 653                         jfs_error(sb, "updateSuper failed\n");
 654                         goto out;
 655                 }
 656                 rc = lmLogInit(log);
 657                 if (rc)
 658                         jfs_error(sb, "lmLogInit failed\n");
 659 out:
 660                 txResume(sb);
 661         }
 662         return rc;
 663 }
 664
 665 static struct dentry *jfs_do_mount(struct file_system_type *fs_type,
 666         int flags, const char *dev_name, void *data)
 667 {
 668         return mount_bdev(fs_type, flags, dev_name, data, jfs_fill_super);
 669 }
 670
 671 static int jfs_sync_fs(struct super_block *sb, int wait)
 672 {
 673         struct jfs_log *log = JFS_SBI(sb)->log;
 674
 675         /* log == NULL indicates read-only mount */
 676         if (log) {
 677                 /*
 678                  * Write quota structures to quota file, sync_blockdev() will
 679                  * write them to disk later
 680                  */
 681                 dquot_writeback_dquots(sb, -1);
 682                 jfs_flush_journal(log, wait);
 683                 jfs_syncpt(log, 0);
 684         }
 685
 686         return 0;
 687 }
 688
 689 static int jfs_show_options(struct seq_file *seq, struct dentry *root)
 690 {
 691         struct jfs_sb_info *sbi = JFS_SBI(root->d_sb);
 692
 693         if (uid_valid(sbi->uid))
 694                 seq_printf(seq, ",uid=%d", from_kuid(&init_user_ns, sbi->uid));
 695         if (gid_valid(sbi->gid))
 696                 seq_printf(seq, ",gid=%d", from_kgid(&init_user_ns, sbi->gid));
 697         if (sbi->umask != -1)
 698                 seq_printf(seq, ",umask=%03o", sbi->umask);
 699         if (sbi->flag & JFS_NOINTEGRITY)
 700                 seq_puts(seq, ",nointegrity");
 701         if (sbi->flag & JFS_DISCARD)
 702                 seq_printf(seq, ",discard=%u", sbi->minblks_trim);
 703         if (sbi->nls_tab)
 704                 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset);
 705         if (sbi->flag & JFS_ERR_CONTINUE)
 706                 seq_printf(seq, ",errors=continue");
 707         if (sbi->flag & JFS_ERR_PANIC)
 708                 seq_printf(seq, ",errors=panic");
 709
 710 #ifdef CONFIG_QUOTA
 711         if (sbi->flag & JFS_USRQUOTA)
 712                 seq_puts(seq, ",usrquota");
 713
 714         if (sbi->flag & JFS_GRPQUOTA)
 715                 seq_puts(seq, ",grpquota");
 716 #endif
 717
 718         return 0;
 719 }
 720
 721 #ifdef CONFIG_QUOTA
 722
 723 /* Read data from quotafile - avoid pagecache and such because we cannot afford
 724  * acquiring the locks... As quota files are never truncated and quota code
 725  * itself serializes the operations (and no one else should touch the files)
 726  * we don't have to be afraid of races */
 727 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
 728                               size_t len, loff_t off)
 729 {
 730         struct inode *inode = sb_dqopt(sb)->files[type];
 731         sector_t blk = off >> sb->s_blocksize_bits;
 732         int err = 0;
 733         int offset = off & (sb->s_blocksize - 1);
 734         int tocopy;
 735         size_t toread;
 736         struct buffer_head tmp_bh;
 737         struct buffer_head *bh;
 738         loff_t i_size = i_size_read(inode);
 739
 740         if (off > i_size)
 741                 return 0;
 742         if (off+len > i_size)
 743                 len = i_size-off;
 744         toread = len;
 745         while (toread > 0) {
 746                 tocopy = sb->s_blocksize - offset < toread ?
 747                                 sb->s_blocksize - offset : toread;
 748
 749                 tmp_bh.b_state = 0;
 750                 tmp_bh.b_size = 1 << inode->i_blkbits;
 751                 err = jfs_get_block(inode, blk, &tmp_bh, 0);
 752                 if (err)
 753                         return err;
 754                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
 755                         memset(data, 0, tocopy);
 756                 else {
 757                         bh = sb_bread(sb, tmp_bh.b_blocknr);
 758                         if (!bh)
 759                                 return -EIO;
 760                         memcpy(data, bh->b_data+offset, tocopy);
 761                         brelse(bh);
 762                 }
 763                 offset = 0;
 764                 toread -= tocopy;
 765                 data += tocopy;
 766                 blk++;
 767         }
 768         return len;
 769 }
 770
 771 /* Write to quotafile */
 772 static ssize_t jfs_quota_write(struct super_block *sb, int type,
 773                                const char *data, size_t len, loff_t off)
 774 {
 775         struct inode *inode = sb_dqopt(sb)->files[type];
 776         sector_t blk = off >> sb->s_blocksize_bits;
 777         int err = 0;
 778         int offset = off & (sb->s_blocksize - 1);
 779         int tocopy;
 780         size_t towrite = len;
 781         struct buffer_head tmp_bh;
 782         struct buffer_head *bh;
 783
 784         mutex_lock(&inode->i_mutex);
 785         while (towrite > 0) {
 786                 tocopy = sb->s_blocksize - offset < towrite ?
 787                                 sb->s_blocksize - offset : towrite;
 788
 789                 tmp_bh.b_state = 0;
 790                 tmp_bh.b_size = 1 << inode->i_blkbits;
 791                 err = jfs_get_block(inode, blk, &tmp_bh, 1);
 792                 if (err)
 793                         goto out;
 794                 if (offset || tocopy != sb->s_blocksize)
 795                         bh = sb_bread(sb, tmp_bh.b_blocknr);
 796                 else
 797                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
 798                 if (!bh) {
 799                         err = -EIO;
 800                         goto out;
 801                 }
 802                 lock_buffer(bh);
 803                 memcpy(bh->b_data+offset, data, tocopy);
 804                 flush_dcache_page(bh->b_page);
 805                 set_buffer_uptodate(bh);
 806                 mark_buffer_dirty(bh);
 807                 unlock_buffer(bh);
 808                 brelse(bh);
 809                 offset = 0;
 810                 towrite -= tocopy;
 811                 data += tocopy;
 812                 blk++;
 813         }
 814 out:
 815         if (len == towrite) {
 816                 mutex_unlock(&inode->i_mutex);
 817                 return err;
 818         }
 819         if (inode->i_size < off+len-towrite)
 820                 i_size_write(inode, off+len-towrite);
 821         inode->i_version++;
 822         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
 823         mark_inode_dirty(inode);
 824         mutex_unlock(&inode->i_mutex);
 825         return len - towrite;
 826 }
 827
 828 #endif
 829
 830 static const struct super_operations jfs_super_operations = {
 831         .alloc_inode    = jfs_alloc_inode,
 832         .destroy_inode  = jfs_destroy_inode,
 833         .dirty_inode    = jfs_dirty_inode,
 834         .write_inode    = jfs_write_inode,
 835         .evict_inode    = jfs_evict_inode,
 836         .put_super      = jfs_put_super,
 837         .sync_fs        = jfs_sync_fs,
 838         .freeze_fs      = jfs_freeze,
 839         .unfreeze_fs    = jfs_unfreeze,
 840         .statfs         = jfs_statfs,
 841         .remount_fs     = jfs_remount,
 842         .show_options   = jfs_show_options,
 843 #ifdef CONFIG_QUOTA
 844         .quota_read     = jfs_quota_read,
 845         .quota_write    = jfs_quota_write,
 846 #endif
 847 };
 848
 849 static const struct export_operations jfs_export_operations = {
 850         .fh_to_dentry   = jfs_fh_to_dentry,
 851         .fh_to_parent   = jfs_fh_to_parent,
 852         .get_parent     = jfs_get_parent,
 853 };
 854
 855 static struct file_system_type jfs_fs_type = {
 856         .owner          = THIS_MODULE,
 857         .name           = "jfs",
 858         .mount          = jfs_do_mount,
 859         .kill_sb        = kill_block_super,
 860         .fs_flags       = FS_REQUIRES_DEV,
 861 };
 862 MODULE_ALIAS_FS("jfs");
 863
 864 static void init_once(void *foo)
 865 {
 866         struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
 867
 868         memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
 869         INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
 870         init_rwsem(&jfs_ip->rdwrlock);
 871         mutex_init(&jfs_ip->commit_mutex);
 872         init_rwsem(&jfs_ip->xattr_sem);
 873         spin_lock_init(&jfs_ip->ag_lock);
 874         jfs_ip->active_ag = -1;
 875         inode_init_once(&jfs_ip->vfs_inode);
 876 }
 877
 878 static int __init init_jfs_fs(void)
 879 {
 880         int i;
 881         int rc;
 882
 883         jfs_inode_cachep =
 884             kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
 885                             SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
 886                             init_once);
 887         if (jfs_inode_cachep == NULL)
 888                 return -ENOMEM;
 889
 890         /*
 891          * Metapage initialization
 892          */
 893         rc = metapage_init();
 894         if (rc) {
 895                 jfs_err("metapage_init failed w/rc = %d", rc);
 896                 goto free_slab;
 897         }
 898
 899         /*
 900          * Transaction Manager initialization
 901          */
 902         rc = txInit();
 903         if (rc) {
 904                 jfs_err("txInit failed w/rc = %d", rc);
 905                 goto free_metapage;
 906         }
 907
 908         /*
 909          * I/O completion thread (endio)
 910          */
 911         jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
 912         if (IS_ERR(jfsIOthread)) {
 913                 rc = PTR_ERR(jfsIOthread);
 914                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
 915                 goto end_txmngr;
 916         }
 917
 918         if (commit_threads < 1)
 919                 commit_threads = num_online_cpus();
 920         if (commit_threads > MAX_COMMIT_THREADS)
 921                 commit_threads = MAX_COMMIT_THREADS;
 922
 923         for (i = 0; i < commit_threads; i++) {
 924                 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, "jfsCommit");
 925                 if (IS_ERR(jfsCommitThread[i])) {
 926                         rc = PTR_ERR(jfsCommitThread[i]);
 927                         jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
 928                         commit_threads = i;
 929                         goto kill_committask;
 930                 }
 931         }
 932
 933         jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
 934         if (IS_ERR(jfsSyncThread)) {
 935                 rc = PTR_ERR(jfsSyncThread);
 936                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
 937                 goto kill_committask;
 938         }
 939
 940 #ifdef PROC_FS_JFS
 941         jfs_proc_init();
 942 #endif
 943
 944         rc = register_filesystem(&jfs_fs_type);
 945         if (!rc)
 946                 return 0;
 947
 948 #ifdef PROC_FS_JFS
 949         jfs_proc_clean();
 950 #endif
 951         kthread_stop(jfsSyncThread);
 952 kill_committask:
 953         for (i = 0; i < commit_threads; i++)
 954                 kthread_stop(jfsCommitThread[i]);
 955         kthread_stop(jfsIOthread);
 956 end_txmngr:
 957         txExit();
 958 free_metapage:
 959         metapage_exit();
 960 free_slab:
 961         kmem_cache_destroy(jfs_inode_cachep);
 962         return rc;
 963 }
 964
 965 static void __exit exit_jfs_fs(void)
 966 {
 967         int i;
 968
 969         jfs_info("exit_jfs_fs called");
 970
 971         txExit();
 972         metapage_exit();
 973
 974         kthread_stop(jfsIOthread);
 975         for (i = 0; i < commit_threads; i++)
 976                 kthread_stop(jfsCommitThread[i]);
 977         kthread_stop(jfsSyncThread);
 978 #ifdef PROC_FS_JFS
 979         jfs_proc_clean();
 980 #endif
 981         unregister_filesystem(&jfs_fs_type);
 982
 983         /*
 984          * Make sure all delayed rcu free inodes are flushed before we
 985          * destroy cache.
 986          */
 987         rcu_barrier();
 988         kmem_cache_destroy(jfs_inode_cachep);
 989 }
 990
 991 module_init(init_jfs_fs)
 992 module_exit(exit_jfs_fs)