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