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 <linux/uaccess.h> 35 #include <linux/seq_file.h> 36 #include <linux/blkdev.h> 37 38 #include "jfs_incore.h" 39 #include "jfs_filsys.h" 40 #include "jfs_inode.h" 41 #include "jfs_metapage.h" 42 #include "jfs_superblock.h" 43 #include "jfs_dmap.h" 44 #include "jfs_imap.h" 45 #include "jfs_acl.h" 46 #include "jfs_debug.h" 47 #include "jfs_xattr.h" 48 49 MODULE_DESCRIPTION("The Journaled Filesystem (JFS)"); 50 MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM"); 51 MODULE_LICENSE("GPL"); 52 53 static struct kmem_cache *jfs_inode_cachep; 54 55 static const struct super_operations jfs_super_operations; 56 static const struct export_operations jfs_export_operations; 57 static struct file_system_type jfs_fs_type; 58 59 #define MAX_COMMIT_THREADS 64 60 static int commit_threads; 61 module_param(commit_threads, int, 0); 62 MODULE_PARM_DESC(commit_threads, "Number of commit threads"); 63 64 static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS]; 65 struct task_struct *jfsIOthread; 66 struct task_struct *jfsSyncThread; 67 68 #ifdef CONFIG_JFS_DEBUG 69 int jfsloglevel = JFS_LOGLEVEL_WARN; 70 module_param(jfsloglevel, int, 0644); 71 MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)"); 72 #endif 73 74 static void jfs_handle_error(struct super_block *sb) 75 { 76 struct jfs_sb_info *sbi = JFS_SBI(sb); 77 78 if (sb->s_flags & MS_RDONLY) 79 return; 80 81 updateSuper(sb, FM_DIRTY); 82 83 if (sbi->flag & JFS_ERR_PANIC) 84 panic("JFS (device %s): panic forced after error\n", 85 sb->s_id); 86 else if (sbi->flag & JFS_ERR_REMOUNT_RO) { 87 jfs_err("ERROR: (device %s): remounting filesystem as read-only", 88 sb->s_id); 89 sb->s_flags |= MS_RDONLY; 90 } 91 92 /* nothing is done for continue beyond marking the superblock dirty */ 93 } 94 95 void jfs_error(struct super_block *sb, const char *fmt, ...) 96 { 97 struct va_format vaf; 98 va_list args; 99 100 va_start(args, fmt); 101 102 vaf.fmt = fmt; 103 vaf.va = &args; 104 105 pr_err("ERROR: (device %s): %ps: %pV\n", 106 sb->s_id, __builtin_return_address(0), &vaf); 107 108 va_end(args); 109 110 jfs_handle_error(sb); 111 } 112 113 static struct inode *jfs_alloc_inode(struct super_block *sb) 114 { 115 struct jfs_inode_info *jfs_inode; 116 117 jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS); 118 if (!jfs_inode) 119 return NULL; 120 #ifdef CONFIG_QUOTA 121 memset(&jfs_inode->i_dquot, 0, sizeof(jfs_inode->i_dquot)); 122 #endif 123 return &jfs_inode->vfs_inode; 124 } 125 126 static void jfs_i_callback(struct rcu_head *head) 127 { 128 struct inode *inode = container_of(head, struct inode, i_rcu); 129 struct jfs_inode_info *ji = JFS_IP(inode); 130 kmem_cache_free(jfs_inode_cachep, ji); 131 } 132 133 static void jfs_destroy_inode(struct inode *inode) 134 { 135 struct jfs_inode_info *ji = JFS_IP(inode); 136 137 BUG_ON(!list_empty(&ji->anon_inode_list)); 138 139 spin_lock_irq(&ji->ag_lock); 140 if (ji->active_ag != -1) { 141 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap; 142 atomic_dec(&bmap->db_active[ji->active_ag]); 143 ji->active_ag = -1; 144 } 145 spin_unlock_irq(&ji->ag_lock); 146 call_rcu(&inode->i_rcu, jfs_i_callback); 147 } 148 149 static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf) 150 { 151 struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb); 152 s64 maxinodes; 153 struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap; 154 155 jfs_info("In jfs_statfs"); 156 buf->f_type = JFS_SUPER_MAGIC; 157 buf->f_bsize = sbi->bsize; 158 buf->f_blocks = sbi->bmap->db_mapsize; 159 buf->f_bfree = sbi->bmap->db_nfree; 160 buf->f_bavail = sbi->bmap->db_nfree; 161 /* 162 * If we really return the number of allocated & free inodes, some 163 * applications will fail because they won't see enough free inodes. 164 * We'll try to calculate some guess as to how many inodes we can 165 * really allocate 166 * 167 * buf->f_files = atomic_read(&imap->im_numinos); 168 * buf->f_ffree = atomic_read(&imap->im_numfree); 169 */ 170 maxinodes = min((s64) atomic_read(&imap->im_numinos) + 171 ((sbi->bmap->db_nfree >> imap->im_l2nbperiext) 172 << L2INOSPEREXT), (s64) 0xffffffffLL); 173 buf->f_files = maxinodes; 174 buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) - 175 atomic_read(&imap->im_numfree)); 176 buf->f_fsid.val[0] = (u32)crc32_le(0, sbi->uuid, sizeof(sbi->uuid)/2); 177 buf->f_fsid.val[1] = (u32)crc32_le(0, sbi->uuid + sizeof(sbi->uuid)/2, 178 sizeof(sbi->uuid)/2); 179 180 buf->f_namelen = JFS_NAME_MAX; 181 return 0; 182 } 183 184 static void jfs_put_super(struct super_block *sb) 185 { 186 struct jfs_sb_info *sbi = JFS_SBI(sb); 187 int rc; 188 189 jfs_info("In jfs_put_super"); 190 191 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); 192 193 rc = jfs_umount(sb); 194 if (rc) 195 jfs_err("jfs_umount failed with return code %d", rc); 196 197 unload_nls(sbi->nls_tab); 198 199 truncate_inode_pages(sbi->direct_inode->i_mapping, 0); 200 iput(sbi->direct_inode); 201 202 kfree(sbi); 203 } 204 205 enum { 206 Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize, 207 Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota, 208 Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask, 209 Opt_discard, Opt_nodiscard, Opt_discard_minblk 210 }; 211 212 static const match_table_t tokens = { 213 {Opt_integrity, "integrity"}, 214 {Opt_nointegrity, "nointegrity"}, 215 {Opt_iocharset, "iocharset=%s"}, 216 {Opt_resize, "resize=%u"}, 217 {Opt_resize_nosize, "resize"}, 218 {Opt_errors, "errors=%s"}, 219 {Opt_ignore, "noquota"}, 220 {Opt_ignore, "quota"}, 221 {Opt_usrquota, "usrquota"}, 222 {Opt_grpquota, "grpquota"}, 223 {Opt_uid, "uid=%u"}, 224 {Opt_gid, "gid=%u"}, 225 {Opt_umask, "umask=%u"}, 226 {Opt_discard, "discard"}, 227 {Opt_nodiscard, "nodiscard"}, 228 {Opt_discard_minblk, "discard=%u"}, 229 {Opt_err, NULL} 230 }; 231 232 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize, 233 int *flag) 234 { 235 void *nls_map = (void *)-1; /* -1: no change; NULL: none */ 236 char *p; 237 struct jfs_sb_info *sbi = JFS_SBI(sb); 238 239 *newLVSize = 0; 240 241 if (!options) 242 return 1; 243 244 while ((p = strsep(&options, ",")) != NULL) { 245 substring_t args[MAX_OPT_ARGS]; 246 int token; 247 if (!*p) 248 continue; 249 250 token = match_token(p, tokens, args); 251 switch (token) { 252 case Opt_integrity: 253 *flag &= ~JFS_NOINTEGRITY; 254 break; 255 case Opt_nointegrity: 256 *flag |= JFS_NOINTEGRITY; 257 break; 258 case Opt_ignore: 259 /* Silently ignore the quota options */ 260 /* Don't do anything ;-) */ 261 break; 262 case Opt_iocharset: 263 if (nls_map && nls_map != (void *) -1) 264 unload_nls(nls_map); 265 if (!strcmp(args[0].from, "none")) 266 nls_map = NULL; 267 else { 268 nls_map = load_nls(args[0].from); 269 if (!nls_map) { 270 pr_err("JFS: charset not found\n"); 271 goto cleanup; 272 } 273 } 274 break; 275 case Opt_resize: 276 { 277 char *resize = args[0].from; 278 int rc = kstrtoll(resize, 0, newLVSize); 279 280 if (rc) 281 goto cleanup; 282 break; 283 } 284 case Opt_resize_nosize: 285 { 286 *newLVSize = sb->s_bdev->bd_inode->i_size >> 287 sb->s_blocksize_bits; 288 if (*newLVSize == 0) 289 pr_err("JFS: Cannot determine volume size\n"); 290 break; 291 } 292 case Opt_errors: 293 { 294 char *errors = args[0].from; 295 if (!errors || !*errors) 296 goto cleanup; 297 if (!strcmp(errors, "continue")) { 298 *flag &= ~JFS_ERR_REMOUNT_RO; 299 *flag &= ~JFS_ERR_PANIC; 300 *flag |= JFS_ERR_CONTINUE; 301 } else if (!strcmp(errors, "remount-ro")) { 302 *flag &= ~JFS_ERR_CONTINUE; 303 *flag &= ~JFS_ERR_PANIC; 304 *flag |= JFS_ERR_REMOUNT_RO; 305 } else if (!strcmp(errors, "panic")) { 306 *flag &= ~JFS_ERR_CONTINUE; 307 *flag &= ~JFS_ERR_REMOUNT_RO; 308 *flag |= JFS_ERR_PANIC; 309 } else { 310 pr_err("JFS: %s is an invalid error handler\n", 311 errors); 312 goto cleanup; 313 } 314 break; 315 } 316 317 #ifdef CONFIG_QUOTA 318 case Opt_quota: 319 case Opt_usrquota: 320 *flag |= JFS_USRQUOTA; 321 break; 322 case Opt_grpquota: 323 *flag |= JFS_GRPQUOTA; 324 break; 325 #else 326 case Opt_usrquota: 327 case Opt_grpquota: 328 case Opt_quota: 329 pr_err("JFS: quota operations not supported\n"); 330 break; 331 #endif 332 case Opt_uid: 333 { 334 char *uid = args[0].from; 335 uid_t val; 336 int rc = kstrtouint(uid, 0, &val); 337 338 if (rc) 339 goto cleanup; 340 sbi->uid = make_kuid(current_user_ns(), val); 341 if (!uid_valid(sbi->uid)) 342 goto cleanup; 343 break; 344 } 345 346 case Opt_gid: 347 { 348 char *gid = args[0].from; 349 gid_t val; 350 int rc = kstrtouint(gid, 0, &val); 351 352 if (rc) 353 goto cleanup; 354 sbi->gid = make_kgid(current_user_ns(), val); 355 if (!gid_valid(sbi->gid)) 356 goto cleanup; 357 break; 358 } 359 360 case Opt_umask: 361 { 362 char *umask = args[0].from; 363 int rc = kstrtouint(umask, 8, &sbi->umask); 364 365 if (rc) 366 goto cleanup; 367 if (sbi->umask & ~0777) { 368 pr_err("JFS: Invalid value of umask\n"); 369 goto cleanup; 370 } 371 break; 372 } 373 374 case Opt_discard: 375 { 376 struct request_queue *q = bdev_get_queue(sb->s_bdev); 377 /* if set to 1, even copying files will cause 378 * trimming :O 379 * -> user has more control over the online trimming 380 */ 381 sbi->minblks_trim = 64; 382 if (blk_queue_discard(q)) 383 *flag |= JFS_DISCARD; 384 else 385 pr_err("JFS: discard option not supported on device\n"); 386 break; 387 } 388 389 case Opt_nodiscard: 390 *flag &= ~JFS_DISCARD; 391 break; 392 393 case Opt_discard_minblk: 394 { 395 struct request_queue *q = bdev_get_queue(sb->s_bdev); 396 char *minblks_trim = args[0].from; 397 int rc; 398 if (blk_queue_discard(q)) { 399 *flag |= JFS_DISCARD; 400 rc = kstrtouint(minblks_trim, 0, 401 &sbi->minblks_trim); 402 if (rc) 403 goto cleanup; 404 } else 405 pr_err("JFS: discard option not supported on device\n"); 406 break; 407 } 408 409 default: 410 printk("jfs: Unrecognized mount option \"%s\" or missing value\n", 411 p); 412 goto cleanup; 413 } 414 } 415 416 if (nls_map != (void *) -1) { 417 /* Discard old (if remount) */ 418 unload_nls(sbi->nls_tab); 419 sbi->nls_tab = nls_map; 420 } 421 return 1; 422 423 cleanup: 424 if (nls_map && nls_map != (void *) -1) 425 unload_nls(nls_map); 426 return 0; 427 } 428 429 static int jfs_remount(struct super_block *sb, int *flags, char *data) 430 { 431 s64 newLVSize = 0; 432 int rc = 0; 433 int flag = JFS_SBI(sb)->flag; 434 int ret; 435 436 sync_filesystem(sb); 437 if (!parse_options(data, sb, &newLVSize, &flag)) 438 return -EINVAL; 439 440 if (newLVSize) { 441 if (sb->s_flags & MS_RDONLY) { 442 pr_err("JFS: resize requires volume to be mounted read-write\n"); 443 return -EROFS; 444 } 445 rc = jfs_extendfs(sb, newLVSize, 0); 446 if (rc) 447 return rc; 448 } 449 450 if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) { 451 /* 452 * Invalidate any previously read metadata. fsck may have 453 * changed the on-disk data since we mounted r/o 454 */ 455 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0); 456 457 JFS_SBI(sb)->flag = flag; 458 ret = jfs_mount_rw(sb, 1); 459 460 /* mark the fs r/w for quota activity */ 461 sb->s_flags &= ~MS_RDONLY; 462 463 dquot_resume(sb, -1); 464 return ret; 465 } 466 if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) { 467 rc = dquot_suspend(sb, -1); 468 if (rc < 0) 469 return rc; 470 rc = jfs_umount_rw(sb); 471 JFS_SBI(sb)->flag = flag; 472 return rc; 473 } 474 if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY)) 475 if (!(sb->s_flags & MS_RDONLY)) { 476 rc = jfs_umount_rw(sb); 477 if (rc) 478 return rc; 479 480 JFS_SBI(sb)->flag = flag; 481 ret = jfs_mount_rw(sb, 1); 482 return ret; 483 } 484 JFS_SBI(sb)->flag = flag; 485 486 return 0; 487 } 488 489 static int jfs_fill_super(struct super_block *sb, void *data, int silent) 490 { 491 struct jfs_sb_info *sbi; 492 struct inode *inode; 493 int rc; 494 s64 newLVSize = 0; 495 int flag, ret = -EINVAL; 496 497 jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags); 498 499 sbi = kzalloc(sizeof(struct jfs_sb_info), GFP_KERNEL); 500 if (!sbi) 501 return -ENOMEM; 502 503 sb->s_fs_info = sbi; 504 sb->s_max_links = JFS_LINK_MAX; 505 sbi->sb = sb; 506 sbi->uid = INVALID_UID; 507 sbi->gid = INVALID_GID; 508 sbi->umask = -1; 509 510 /* initialize the mount flag and determine the default error handler */ 511 flag = JFS_ERR_REMOUNT_RO; 512 513 if (!parse_options((char *) data, sb, &newLVSize, &flag)) 514 goto out_kfree; 515 sbi->flag = flag; 516 517 #ifdef CONFIG_JFS_POSIX_ACL 518 sb->s_flags |= MS_POSIXACL; 519 #endif 520 521 if (newLVSize) { 522 pr_err("resize option for remount only\n"); 523 goto out_kfree; 524 } 525 526 /* 527 * Initialize blocksize to 4K. 528 */ 529 sb_set_blocksize(sb, PSIZE); 530 531 /* 532 * Set method vectors. 533 */ 534 sb->s_op = &jfs_super_operations; 535 sb->s_export_op = &jfs_export_operations; 536 sb->s_xattr = jfs_xattr_handlers; 537 #ifdef CONFIG_QUOTA 538 sb->dq_op = &dquot_operations; 539 sb->s_qcop = &dquot_quotactl_ops; 540 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; 541 #endif 542 543 /* 544 * Initialize direct-mapping inode/address-space 545 */ 546 inode = new_inode(sb); 547 if (inode == NULL) { 548 ret = -ENOMEM; 549 goto out_unload; 550 } 551 inode->i_ino = 0; 552 inode->i_size = sb->s_bdev->bd_inode->i_size; 553 inode->i_mapping->a_ops = &jfs_metapage_aops; 554 hlist_add_fake(&inode->i_hash); 555 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS); 556 557 sbi->direct_inode = inode; 558 559 rc = jfs_mount(sb); 560 if (rc) { 561 if (!silent) 562 jfs_err("jfs_mount failed w/return code = %d", rc); 563 goto out_mount_failed; 564 } 565 if (sb->s_flags & MS_RDONLY) 566 sbi->log = NULL; 567 else { 568 rc = jfs_mount_rw(sb, 0); 569 if (rc) { 570 if (!silent) { 571 jfs_err("jfs_mount_rw failed, return code = %d", 572 rc); 573 } 574 goto out_no_rw; 575 } 576 } 577 578 sb->s_magic = JFS_SUPER_MAGIC; 579 580 if (sbi->mntflag & JFS_OS2) 581 sb->s_d_op = &jfs_ci_dentry_operations; 582 583 inode = jfs_iget(sb, ROOT_I); 584 if (IS_ERR(inode)) { 585 ret = PTR_ERR(inode); 586 goto out_no_rw; 587 } 588 sb->s_root = d_make_root(inode); 589 if (!sb->s_root) 590 goto out_no_root; 591 592 /* logical blocks are represented by 40 bits in pxd_t, etc. */ 593 sb->s_maxbytes = ((u64) sb->s_blocksize) << 40; 594 #if BITS_PER_LONG == 32 595 /* 596 * Page cache is indexed by long. 597 * I would use MAX_LFS_FILESIZE, but it's only half as big 598 */ 599 sb->s_maxbytes = min(((u64) PAGE_SIZE << 32) - 1, 600 (u64)sb->s_maxbytes); 601 #endif 602 sb->s_time_gran = 1; 603 return 0; 604 605 out_no_root: 606 jfs_err("jfs_read_super: get root dentry failed"); 607 608 out_no_rw: 609 rc = jfs_umount(sb); 610 if (rc) 611 jfs_err("jfs_umount failed with return code %d", rc); 612 out_mount_failed: 613 filemap_write_and_wait(sbi->direct_inode->i_mapping); 614 truncate_inode_pages(sbi->direct_inode->i_mapping, 0); 615 make_bad_inode(sbi->direct_inode); 616 iput(sbi->direct_inode); 617 sbi->direct_inode = NULL; 618 out_unload: 619 unload_nls(sbi->nls_tab); 620 out_kfree: 621 kfree(sbi); 622 return ret; 623 } 624 625 static int jfs_freeze(struct super_block *sb) 626 { 627 struct jfs_sb_info *sbi = JFS_SBI(sb); 628 struct jfs_log *log = sbi->log; 629 int rc = 0; 630 631 if (!(sb->s_flags & MS_RDONLY)) { 632 txQuiesce(sb); 633 rc = lmLogShutdown(log); 634 if (rc) { 635 jfs_error(sb, "lmLogShutdown failed\n"); 636 637 /* let operations fail rather than hang */ 638 txResume(sb); 639 640 return rc; 641 } 642 rc = updateSuper(sb, FM_CLEAN); 643 if (rc) { 644 jfs_err("jfs_freeze: updateSuper failed"); 645 /* 646 * Don't fail here. Everything succeeded except 647 * marking the superblock clean, so there's really 648 * no harm in leaving it frozen for now. 649 */ 650 } 651 } 652 return 0; 653 } 654 655 static int jfs_unfreeze(struct super_block *sb) 656 { 657 struct jfs_sb_info *sbi = JFS_SBI(sb); 658 struct jfs_log *log = sbi->log; 659 int rc = 0; 660 661 if (!(sb->s_flags & MS_RDONLY)) { 662 rc = updateSuper(sb, FM_MOUNT); 663 if (rc) { 664 jfs_error(sb, "updateSuper failed\n"); 665 goto out; 666 } 667 rc = lmLogInit(log); 668 if (rc) 669 jfs_error(sb, "lmLogInit failed\n"); 670 out: 671 txResume(sb); 672 } 673 return rc; 674 } 675 676 static struct dentry *jfs_do_mount(struct file_system_type *fs_type, 677 int flags, const char *dev_name, void *data) 678 { 679 return mount_bdev(fs_type, flags, dev_name, data, jfs_fill_super); 680 } 681 682 static int jfs_sync_fs(struct super_block *sb, int wait) 683 { 684 struct jfs_log *log = JFS_SBI(sb)->log; 685 686 /* log == NULL indicates read-only mount */ 687 if (log) { 688 /* 689 * Write quota structures to quota file, sync_blockdev() will 690 * write them to disk later 691 */ 692 dquot_writeback_dquots(sb, -1); 693 jfs_flush_journal(log, wait); 694 jfs_syncpt(log, 0); 695 } 696 697 return 0; 698 } 699 700 static int jfs_show_options(struct seq_file *seq, struct dentry *root) 701 { 702 struct jfs_sb_info *sbi = JFS_SBI(root->d_sb); 703 704 if (uid_valid(sbi->uid)) 705 seq_printf(seq, ",uid=%d", from_kuid(&init_user_ns, sbi->uid)); 706 if (gid_valid(sbi->gid)) 707 seq_printf(seq, ",gid=%d", from_kgid(&init_user_ns, sbi->gid)); 708 if (sbi->umask != -1) 709 seq_printf(seq, ",umask=%03o", sbi->umask); 710 if (sbi->flag & JFS_NOINTEGRITY) 711 seq_puts(seq, ",nointegrity"); 712 if (sbi->flag & JFS_DISCARD) 713 seq_printf(seq, ",discard=%u", sbi->minblks_trim); 714 if (sbi->nls_tab) 715 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset); 716 if (sbi->flag & JFS_ERR_CONTINUE) 717 seq_printf(seq, ",errors=continue"); 718 if (sbi->flag & JFS_ERR_PANIC) 719 seq_printf(seq, ",errors=panic"); 720 721 #ifdef CONFIG_QUOTA 722 if (sbi->flag & JFS_USRQUOTA) 723 seq_puts(seq, ",usrquota"); 724 725 if (sbi->flag & JFS_GRPQUOTA) 726 seq_puts(seq, ",grpquota"); 727 #endif 728 729 return 0; 730 } 731 732 #ifdef CONFIG_QUOTA 733 734 /* Read data from quotafile - avoid pagecache and such because we cannot afford 735 * acquiring the locks... As quota files are never truncated and quota code 736 * itself serializes the operations (and no one else should touch the files) 737 * we don't have to be afraid of races */ 738 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data, 739 size_t len, loff_t off) 740 { 741 struct inode *inode = sb_dqopt(sb)->files[type]; 742 sector_t blk = off >> sb->s_blocksize_bits; 743 int err = 0; 744 int offset = off & (sb->s_blocksize - 1); 745 int tocopy; 746 size_t toread; 747 struct buffer_head tmp_bh; 748 struct buffer_head *bh; 749 loff_t i_size = i_size_read(inode); 750 751 if (off > i_size) 752 return 0; 753 if (off+len > i_size) 754 len = i_size-off; 755 toread = len; 756 while (toread > 0) { 757 tocopy = sb->s_blocksize - offset < toread ? 758 sb->s_blocksize - offset : toread; 759 760 tmp_bh.b_state = 0; 761 tmp_bh.b_size = i_blocksize(inode); 762 err = jfs_get_block(inode, blk, &tmp_bh, 0); 763 if (err) 764 return err; 765 if (!buffer_mapped(&tmp_bh)) /* A hole? */ 766 memset(data, 0, tocopy); 767 else { 768 bh = sb_bread(sb, tmp_bh.b_blocknr); 769 if (!bh) 770 return -EIO; 771 memcpy(data, bh->b_data+offset, tocopy); 772 brelse(bh); 773 } 774 offset = 0; 775 toread -= tocopy; 776 data += tocopy; 777 blk++; 778 } 779 return len; 780 } 781 782 /* Write to quotafile */ 783 static ssize_t jfs_quota_write(struct super_block *sb, int type, 784 const char *data, size_t len, loff_t off) 785 { 786 struct inode *inode = sb_dqopt(sb)->files[type]; 787 sector_t blk = off >> sb->s_blocksize_bits; 788 int err = 0; 789 int offset = off & (sb->s_blocksize - 1); 790 int tocopy; 791 size_t towrite = len; 792 struct buffer_head tmp_bh; 793 struct buffer_head *bh; 794 795 inode_lock(inode); 796 while (towrite > 0) { 797 tocopy = sb->s_blocksize - offset < towrite ? 798 sb->s_blocksize - offset : towrite; 799 800 tmp_bh.b_state = 0; 801 tmp_bh.b_size = i_blocksize(inode); 802 err = jfs_get_block(inode, blk, &tmp_bh, 1); 803 if (err) 804 goto out; 805 if (offset || tocopy != sb->s_blocksize) 806 bh = sb_bread(sb, tmp_bh.b_blocknr); 807 else 808 bh = sb_getblk(sb, tmp_bh.b_blocknr); 809 if (!bh) { 810 err = -EIO; 811 goto out; 812 } 813 lock_buffer(bh); 814 memcpy(bh->b_data+offset, data, tocopy); 815 flush_dcache_page(bh->b_page); 816 set_buffer_uptodate(bh); 817 mark_buffer_dirty(bh); 818 unlock_buffer(bh); 819 brelse(bh); 820 offset = 0; 821 towrite -= tocopy; 822 data += tocopy; 823 blk++; 824 } 825 out: 826 if (len == towrite) { 827 inode_unlock(inode); 828 return err; 829 } 830 if (inode->i_size < off+len-towrite) 831 i_size_write(inode, off+len-towrite); 832 inode->i_version++; 833 inode->i_mtime = inode->i_ctime = current_time(inode); 834 mark_inode_dirty(inode); 835 inode_unlock(inode); 836 return len - towrite; 837 } 838 839 static struct dquot **jfs_get_dquots(struct inode *inode) 840 { 841 return JFS_IP(inode)->i_dquot; 842 } 843 #endif 844 845 static const struct super_operations jfs_super_operations = { 846 .alloc_inode = jfs_alloc_inode, 847 .destroy_inode = jfs_destroy_inode, 848 .dirty_inode = jfs_dirty_inode, 849 .write_inode = jfs_write_inode, 850 .evict_inode = jfs_evict_inode, 851 .put_super = jfs_put_super, 852 .sync_fs = jfs_sync_fs, 853 .freeze_fs = jfs_freeze, 854 .unfreeze_fs = jfs_unfreeze, 855 .statfs = jfs_statfs, 856 .remount_fs = jfs_remount, 857 .show_options = jfs_show_options, 858 #ifdef CONFIG_QUOTA 859 .quota_read = jfs_quota_read, 860 .quota_write = jfs_quota_write, 861 .get_dquots = jfs_get_dquots, 862 #endif 863 }; 864 865 static const struct export_operations jfs_export_operations = { 866 .fh_to_dentry = jfs_fh_to_dentry, 867 .fh_to_parent = jfs_fh_to_parent, 868 .get_parent = jfs_get_parent, 869 }; 870 871 static struct file_system_type jfs_fs_type = { 872 .owner = THIS_MODULE, 873 .name = "jfs", 874 .mount = jfs_do_mount, 875 .kill_sb = kill_block_super, 876 .fs_flags = FS_REQUIRES_DEV, 877 }; 878 MODULE_ALIAS_FS("jfs"); 879 880 static void init_once(void *foo) 881 { 882 struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo; 883 884 memset(jfs_ip, 0, sizeof(struct jfs_inode_info)); 885 INIT_LIST_HEAD(&jfs_ip->anon_inode_list); 886 init_rwsem(&jfs_ip->rdwrlock); 887 mutex_init(&jfs_ip->commit_mutex); 888 init_rwsem(&jfs_ip->xattr_sem); 889 spin_lock_init(&jfs_ip->ag_lock); 890 jfs_ip->active_ag = -1; 891 inode_init_once(&jfs_ip->vfs_inode); 892 } 893 894 static int __init init_jfs_fs(void) 895 { 896 int i; 897 int rc; 898 899 jfs_inode_cachep = 900 kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0, 901 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|SLAB_ACCOUNT, 902 init_once); 903 if (jfs_inode_cachep == NULL) 904 return -ENOMEM; 905 906 /* 907 * Metapage initialization 908 */ 909 rc = metapage_init(); 910 if (rc) { 911 jfs_err("metapage_init failed w/rc = %d", rc); 912 goto free_slab; 913 } 914 915 /* 916 * Transaction Manager initialization 917 */ 918 rc = txInit(); 919 if (rc) { 920 jfs_err("txInit failed w/rc = %d", rc); 921 goto free_metapage; 922 } 923 924 /* 925 * I/O completion thread (endio) 926 */ 927 jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO"); 928 if (IS_ERR(jfsIOthread)) { 929 rc = PTR_ERR(jfsIOthread); 930 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 931 goto end_txmngr; 932 } 933 934 if (commit_threads < 1) 935 commit_threads = num_online_cpus(); 936 if (commit_threads > MAX_COMMIT_THREADS) 937 commit_threads = MAX_COMMIT_THREADS; 938 939 for (i = 0; i < commit_threads; i++) { 940 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, 941 "jfsCommit"); 942 if (IS_ERR(jfsCommitThread[i])) { 943 rc = PTR_ERR(jfsCommitThread[i]); 944 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 945 commit_threads = i; 946 goto kill_committask; 947 } 948 } 949 950 jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync"); 951 if (IS_ERR(jfsSyncThread)) { 952 rc = PTR_ERR(jfsSyncThread); 953 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 954 goto kill_committask; 955 } 956 957 #ifdef PROC_FS_JFS 958 jfs_proc_init(); 959 #endif 960 961 rc = register_filesystem(&jfs_fs_type); 962 if (!rc) 963 return 0; 964 965 #ifdef PROC_FS_JFS 966 jfs_proc_clean(); 967 #endif 968 kthread_stop(jfsSyncThread); 969 kill_committask: 970 for (i = 0; i < commit_threads; i++) 971 kthread_stop(jfsCommitThread[i]); 972 kthread_stop(jfsIOthread); 973 end_txmngr: 974 txExit(); 975 free_metapage: 976 metapage_exit(); 977 free_slab: 978 kmem_cache_destroy(jfs_inode_cachep); 979 return rc; 980 } 981 982 static void __exit exit_jfs_fs(void) 983 { 984 int i; 985 986 jfs_info("exit_jfs_fs called"); 987 988 txExit(); 989 metapage_exit(); 990 991 kthread_stop(jfsIOthread); 992 for (i = 0; i < commit_threads; i++) 993 kthread_stop(jfsCommitThread[i]); 994 kthread_stop(jfsSyncThread); 995 #ifdef PROC_FS_JFS 996 jfs_proc_clean(); 997 #endif 998 unregister_filesystem(&jfs_fs_type); 999 1000 /* 1001 * Make sure all delayed rcu free inodes are flushed before we 1002 * destroy cache. 1003 */ 1004 rcu_barrier(); 1005 kmem_cache_destroy(jfs_inode_cachep); 1006 } 1007 1008 module_init(init_jfs_fs) 1009 module_exit(exit_jfs_fs) 1010