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) 993