1 /* 2 * Copyright (C) International Business Machines Corp., 2000-2004 3 * Portions Copyright (C) Christoph Hellwig, 2001-2002 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; either version 2 of the License, or 8 * (at your option) any later version. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See 13 * the GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 18 */ 19 20 #include <linux/fs.h> 21 #include <linux/module.h> 22 #include <linux/parser.h> 23 #include <linux/completion.h> 24 #include <linux/vfs.h> 25 #include <linux/quotaops.h> 26 #include <linux/mount.h> 27 #include <linux/moduleparam.h> 28 #include <linux/kthread.h> 29 #include <linux/posix_acl.h> 30 #include <linux/buffer_head.h> 31 #include <linux/exportfs.h> 32 #include <linux/crc32.h> 33 #include <linux/slab.h> 34 #include <asm/uaccess.h> 35 #include <linux/seq_file.h> 36 #include <linux/blkdev.h> 37 38 #include "jfs_incore.h" 39 #include "jfs_filsys.h" 40 #include "jfs_inode.h" 41 #include "jfs_metapage.h" 42 #include "jfs_superblock.h" 43 #include "jfs_dmap.h" 44 #include "jfs_imap.h" 45 #include "jfs_acl.h" 46 #include "jfs_debug.h" 47 #include "jfs_xattr.h" 48 49 MODULE_DESCRIPTION("The Journaled Filesystem (JFS)"); 50 MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM"); 51 MODULE_LICENSE("GPL"); 52 53 static struct kmem_cache *jfs_inode_cachep; 54 55 static const struct super_operations jfs_super_operations; 56 static const struct export_operations jfs_export_operations; 57 static struct file_system_type jfs_fs_type; 58 59 #define MAX_COMMIT_THREADS 64 60 static int commit_threads; 61 module_param(commit_threads, int, 0); 62 MODULE_PARM_DESC(commit_threads, "Number of commit threads"); 63 64 static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS]; 65 struct task_struct *jfsIOthread; 66 struct task_struct *jfsSyncThread; 67 68 #ifdef CONFIG_JFS_DEBUG 69 int jfsloglevel = JFS_LOGLEVEL_WARN; 70 module_param(jfsloglevel, int, 0644); 71 MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)"); 72 #endif 73 74 static void jfs_handle_error(struct super_block *sb) 75 { 76 struct jfs_sb_info *sbi = JFS_SBI(sb); 77 78 if (sb->s_flags & MS_RDONLY) 79 return; 80 81 updateSuper(sb, FM_DIRTY); 82 83 if (sbi->flag & JFS_ERR_PANIC) 84 panic("JFS (device %s): panic forced after error\n", 85 sb->s_id); 86 else if (sbi->flag & JFS_ERR_REMOUNT_RO) { 87 jfs_err("ERROR: (device %s): remounting filesystem as read-only\n", 88 sb->s_id); 89 sb->s_flags |= MS_RDONLY; 90 } 91 92 /* nothing is done for continue beyond marking the superblock dirty */ 93 } 94 95 void jfs_error(struct super_block *sb, const char *fmt, ...) 96 { 97 struct va_format vaf; 98 va_list args; 99 100 va_start(args, fmt); 101 102 vaf.fmt = fmt; 103 vaf.va = &args; 104 105 pr_err("ERROR: (device %s): %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 #ifdef CONFIG_QUOTA 121 memset(&jfs_inode->i_dquot, 0, sizeof(jfs_inode->i_dquot)); 122 #endif 123 return &jfs_inode->vfs_inode; 124 } 125 126 static void jfs_i_callback(struct rcu_head *head) 127 { 128 struct inode *inode = container_of(head, struct inode, i_rcu); 129 struct jfs_inode_info *ji = JFS_IP(inode); 130 kmem_cache_free(jfs_inode_cachep, ji); 131 } 132 133 static void jfs_destroy_inode(struct inode *inode) 134 { 135 struct jfs_inode_info *ji = JFS_IP(inode); 136 137 BUG_ON(!list_empty(&ji->anon_inode_list)); 138 139 spin_lock_irq(&ji->ag_lock); 140 if (ji->active_ag != -1) { 141 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap; 142 atomic_dec(&bmap->db_active[ji->active_ag]); 143 ji->active_ag = -1; 144 } 145 spin_unlock_irq(&ji->ag_lock); 146 call_rcu(&inode->i_rcu, jfs_i_callback); 147 } 148 149 static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf) 150 { 151 struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb); 152 s64 maxinodes; 153 struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap; 154 155 jfs_info("In jfs_statfs"); 156 buf->f_type = JFS_SUPER_MAGIC; 157 buf->f_bsize = sbi->bsize; 158 buf->f_blocks = sbi->bmap->db_mapsize; 159 buf->f_bfree = sbi->bmap->db_nfree; 160 buf->f_bavail = sbi->bmap->db_nfree; 161 /* 162 * If we really return the number of allocated & free inodes, some 163 * applications will fail because they won't see enough free inodes. 164 * We'll try to calculate some guess as to how many inodes we can 165 * really allocate 166 * 167 * buf->f_files = atomic_read(&imap->im_numinos); 168 * buf->f_ffree = atomic_read(&imap->im_numfree); 169 */ 170 maxinodes = min((s64) atomic_read(&imap->im_numinos) + 171 ((sbi->bmap->db_nfree >> imap->im_l2nbperiext) 172 << L2INOSPEREXT), (s64) 0xffffffffLL); 173 buf->f_files = maxinodes; 174 buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) - 175 atomic_read(&imap->im_numfree)); 176 buf->f_fsid.val[0] = (u32)crc32_le(0, sbi->uuid, sizeof(sbi->uuid)/2); 177 buf->f_fsid.val[1] = (u32)crc32_le(0, sbi->uuid + sizeof(sbi->uuid)/2, 178 sizeof(sbi->uuid)/2); 179 180 buf->f_namelen = JFS_NAME_MAX; 181 return 0; 182 } 183 184 static void jfs_put_super(struct super_block *sb) 185 { 186 struct jfs_sb_info *sbi = JFS_SBI(sb); 187 int rc; 188 189 jfs_info("In jfs_put_super"); 190 191 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); 192 193 rc = jfs_umount(sb); 194 if (rc) 195 jfs_err("jfs_umount failed with return code %d", rc); 196 197 unload_nls(sbi->nls_tab); 198 199 truncate_inode_pages(sbi->direct_inode->i_mapping, 0); 200 iput(sbi->direct_inode); 201 202 kfree(sbi); 203 } 204 205 enum { 206 Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize, 207 Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota, 208 Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask, 209 Opt_discard, Opt_nodiscard, Opt_discard_minblk 210 }; 211 212 static const match_table_t tokens = { 213 {Opt_integrity, "integrity"}, 214 {Opt_nointegrity, "nointegrity"}, 215 {Opt_iocharset, "iocharset=%s"}, 216 {Opt_resize, "resize=%u"}, 217 {Opt_resize_nosize, "resize"}, 218 {Opt_errors, "errors=%s"}, 219 {Opt_ignore, "noquota"}, 220 {Opt_ignore, "quota"}, 221 {Opt_usrquota, "usrquota"}, 222 {Opt_grpquota, "grpquota"}, 223 {Opt_uid, "uid=%u"}, 224 {Opt_gid, "gid=%u"}, 225 {Opt_umask, "umask=%u"}, 226 {Opt_discard, "discard"}, 227 {Opt_nodiscard, "nodiscard"}, 228 {Opt_discard_minblk, "discard=%u"}, 229 {Opt_err, NULL} 230 }; 231 232 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize, 233 int *flag) 234 { 235 void *nls_map = (void *)-1; /* -1: no change; NULL: none */ 236 char *p; 237 struct jfs_sb_info *sbi = JFS_SBI(sb); 238 239 *newLVSize = 0; 240 241 if (!options) 242 return 1; 243 244 while ((p = strsep(&options, ",")) != NULL) { 245 substring_t args[MAX_OPT_ARGS]; 246 int token; 247 if (!*p) 248 continue; 249 250 token = match_token(p, tokens, args); 251 switch (token) { 252 case Opt_integrity: 253 *flag &= ~JFS_NOINTEGRITY; 254 break; 255 case Opt_nointegrity: 256 *flag |= JFS_NOINTEGRITY; 257 break; 258 case Opt_ignore: 259 /* Silently ignore the quota options */ 260 /* Don't do anything ;-) */ 261 break; 262 case Opt_iocharset: 263 if (nls_map && nls_map != (void *) -1) 264 unload_nls(nls_map); 265 if (!strcmp(args[0].from, "none")) 266 nls_map = NULL; 267 else { 268 nls_map = load_nls(args[0].from); 269 if (!nls_map) { 270 pr_err("JFS: charset not found\n"); 271 goto cleanup; 272 } 273 } 274 break; 275 case Opt_resize: 276 { 277 char *resize = args[0].from; 278 int rc = kstrtoll(resize, 0, newLVSize); 279 280 if (rc) 281 goto cleanup; 282 break; 283 } 284 case Opt_resize_nosize: 285 { 286 *newLVSize = sb->s_bdev->bd_inode->i_size >> 287 sb->s_blocksize_bits; 288 if (*newLVSize == 0) 289 pr_err("JFS: Cannot determine volume size\n"); 290 break; 291 } 292 case Opt_errors: 293 { 294 char *errors = args[0].from; 295 if (!errors || !*errors) 296 goto cleanup; 297 if (!strcmp(errors, "continue")) { 298 *flag &= ~JFS_ERR_REMOUNT_RO; 299 *flag &= ~JFS_ERR_PANIC; 300 *flag |= JFS_ERR_CONTINUE; 301 } else if (!strcmp(errors, "remount-ro")) { 302 *flag &= ~JFS_ERR_CONTINUE; 303 *flag &= ~JFS_ERR_PANIC; 304 *flag |= JFS_ERR_REMOUNT_RO; 305 } else if (!strcmp(errors, "panic")) { 306 *flag &= ~JFS_ERR_CONTINUE; 307 *flag &= ~JFS_ERR_REMOUNT_RO; 308 *flag |= JFS_ERR_PANIC; 309 } else { 310 pr_err("JFS: %s is an invalid error handler\n", 311 errors); 312 goto cleanup; 313 } 314 break; 315 } 316 317 #ifdef CONFIG_QUOTA 318 case Opt_quota: 319 case Opt_usrquota: 320 *flag |= JFS_USRQUOTA; 321 break; 322 case Opt_grpquota: 323 *flag |= JFS_GRPQUOTA; 324 break; 325 #else 326 case Opt_usrquota: 327 case Opt_grpquota: 328 case Opt_quota: 329 pr_err("JFS: quota operations not supported\n"); 330 break; 331 #endif 332 case Opt_uid: 333 { 334 char *uid = args[0].from; 335 uid_t val; 336 int rc = kstrtouint(uid, 0, &val); 337 338 if (rc) 339 goto cleanup; 340 sbi->uid = make_kuid(current_user_ns(), val); 341 if (!uid_valid(sbi->uid)) 342 goto cleanup; 343 break; 344 } 345 346 case Opt_gid: 347 { 348 char *gid = args[0].from; 349 gid_t val; 350 int rc = kstrtouint(gid, 0, &val); 351 352 if (rc) 353 goto cleanup; 354 sbi->gid = make_kgid(current_user_ns(), val); 355 if (!gid_valid(sbi->gid)) 356 goto cleanup; 357 break; 358 } 359 360 case Opt_umask: 361 { 362 char *umask = args[0].from; 363 int rc = kstrtouint(umask, 8, &sbi->umask); 364 365 if (rc) 366 goto cleanup; 367 if (sbi->umask & ~0777) { 368 pr_err("JFS: Invalid value of umask\n"); 369 goto cleanup; 370 } 371 break; 372 } 373 374 case Opt_discard: 375 { 376 struct request_queue *q = bdev_get_queue(sb->s_bdev); 377 /* if set to 1, even copying files will cause 378 * trimming :O 379 * -> user has more control over the online trimming 380 */ 381 sbi->minblks_trim = 64; 382 if (blk_queue_discard(q)) 383 *flag |= JFS_DISCARD; 384 else 385 pr_err("JFS: discard option not supported on device\n"); 386 break; 387 } 388 389 case Opt_nodiscard: 390 *flag &= ~JFS_DISCARD; 391 break; 392 393 case Opt_discard_minblk: 394 { 395 struct request_queue *q = bdev_get_queue(sb->s_bdev); 396 char *minblks_trim = args[0].from; 397 int rc; 398 if (blk_queue_discard(q)) { 399 *flag |= JFS_DISCARD; 400 rc = kstrtouint(minblks_trim, 0, 401 &sbi->minblks_trim); 402 if (rc) 403 goto cleanup; 404 } else 405 pr_err("JFS: discard option not supported on device\n"); 406 break; 407 } 408 409 default: 410 printk("jfs: Unrecognized mount option \"%s\" or missing value\n", 411 p); 412 goto cleanup; 413 } 414 } 415 416 if (nls_map != (void *) -1) { 417 /* Discard old (if remount) */ 418 unload_nls(sbi->nls_tab); 419 sbi->nls_tab = nls_map; 420 } 421 return 1; 422 423 cleanup: 424 if (nls_map && nls_map != (void *) -1) 425 unload_nls(nls_map); 426 return 0; 427 } 428 429 static int jfs_remount(struct super_block *sb, int *flags, char *data) 430 { 431 s64 newLVSize = 0; 432 int rc = 0; 433 int flag = JFS_SBI(sb)->flag; 434 int ret; 435 436 sync_filesystem(sb); 437 if (!parse_options(data, sb, &newLVSize, &flag)) 438 return -EINVAL; 439 440 if (newLVSize) { 441 if (sb->s_flags & MS_RDONLY) { 442 pr_err("JFS: resize requires volume to be mounted read-write\n"); 443 return -EROFS; 444 } 445 rc = jfs_extendfs(sb, newLVSize, 0); 446 if (rc) 447 return rc; 448 } 449 450 if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) { 451 /* 452 * Invalidate any previously read metadata. fsck may have 453 * changed the on-disk data since we mounted r/o 454 */ 455 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0); 456 457 JFS_SBI(sb)->flag = flag; 458 ret = jfs_mount_rw(sb, 1); 459 460 /* mark the fs r/w for quota activity */ 461 sb->s_flags &= ~MS_RDONLY; 462 463 dquot_resume(sb, -1); 464 return ret; 465 } 466 if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) { 467 rc = dquot_suspend(sb, -1); 468 if (rc < 0) 469 return rc; 470 rc = jfs_umount_rw(sb); 471 JFS_SBI(sb)->flag = flag; 472 return rc; 473 } 474 if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY)) 475 if (!(sb->s_flags & MS_RDONLY)) { 476 rc = jfs_umount_rw(sb); 477 if (rc) 478 return rc; 479 480 JFS_SBI(sb)->flag = flag; 481 ret = jfs_mount_rw(sb, 1); 482 return ret; 483 } 484 JFS_SBI(sb)->flag = flag; 485 486 return 0; 487 } 488 489 static int jfs_fill_super(struct super_block *sb, void *data, int silent) 490 { 491 struct jfs_sb_info *sbi; 492 struct inode *inode; 493 int rc; 494 s64 newLVSize = 0; 495 int flag, ret = -EINVAL; 496 497 jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags); 498 499 if (!new_valid_dev(sb->s_bdev->bd_dev)) 500 return -EOVERFLOW; 501 502 sbi = kzalloc(sizeof(struct jfs_sb_info), GFP_KERNEL); 503 if (!sbi) 504 return -ENOMEM; 505 506 sb->s_fs_info = sbi; 507 sb->s_max_links = JFS_LINK_MAX; 508 sbi->sb = sb; 509 sbi->uid = INVALID_UID; 510 sbi->gid = INVALID_GID; 511 sbi->umask = -1; 512 513 /* initialize the mount flag and determine the default error handler */ 514 flag = JFS_ERR_REMOUNT_RO; 515 516 if (!parse_options((char *) data, sb, &newLVSize, &flag)) 517 goto out_kfree; 518 sbi->flag = flag; 519 520 #ifdef CONFIG_JFS_POSIX_ACL 521 sb->s_flags |= MS_POSIXACL; 522 #endif 523 524 if (newLVSize) { 525 pr_err("resize option for remount only\n"); 526 goto out_kfree; 527 } 528 529 /* 530 * Initialize blocksize to 4K. 531 */ 532 sb_set_blocksize(sb, PSIZE); 533 534 /* 535 * Set method vectors. 536 */ 537 sb->s_op = &jfs_super_operations; 538 sb->s_export_op = &jfs_export_operations; 539 sb->s_xattr = jfs_xattr_handlers; 540 #ifdef CONFIG_QUOTA 541 sb->dq_op = &dquot_operations; 542 sb->s_qcop = &dquot_quotactl_ops; 543 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; 544 #endif 545 546 /* 547 * Initialize direct-mapping inode/address-space 548 */ 549 inode = new_inode(sb); 550 if (inode == NULL) { 551 ret = -ENOMEM; 552 goto out_unload; 553 } 554 inode->i_ino = 0; 555 inode->i_size = sb->s_bdev->bd_inode->i_size; 556 inode->i_mapping->a_ops = &jfs_metapage_aops; 557 hlist_add_fake(&inode->i_hash); 558 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS); 559 560 sbi->direct_inode = inode; 561 562 rc = jfs_mount(sb); 563 if (rc) { 564 if (!silent) 565 jfs_err("jfs_mount failed w/return code = %d", rc); 566 goto out_mount_failed; 567 } 568 if (sb->s_flags & MS_RDONLY) 569 sbi->log = NULL; 570 else { 571 rc = jfs_mount_rw(sb, 0); 572 if (rc) { 573 if (!silent) { 574 jfs_err("jfs_mount_rw failed, return code = %d", 575 rc); 576 } 577 goto out_no_rw; 578 } 579 } 580 581 sb->s_magic = JFS_SUPER_MAGIC; 582 583 if (sbi->mntflag & JFS_OS2) 584 sb->s_d_op = &jfs_ci_dentry_operations; 585 586 inode = jfs_iget(sb, ROOT_I); 587 if (IS_ERR(inode)) { 588 ret = PTR_ERR(inode); 589 goto out_no_rw; 590 } 591 sb->s_root = d_make_root(inode); 592 if (!sb->s_root) 593 goto out_no_root; 594 595 /* logical blocks are represented by 40 bits in pxd_t, etc. */ 596 sb->s_maxbytes = ((u64) sb->s_blocksize) << 40; 597 #if BITS_PER_LONG == 32 598 /* 599 * Page cache is indexed by long. 600 * I would use MAX_LFS_FILESIZE, but it's only half as big 601 */ 602 sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, 603 (u64)sb->s_maxbytes); 604 #endif 605 sb->s_time_gran = 1; 606 return 0; 607 608 out_no_root: 609 jfs_err("jfs_read_super: get root dentry failed"); 610 611 out_no_rw: 612 rc = jfs_umount(sb); 613 if (rc) 614 jfs_err("jfs_umount failed with return code %d", rc); 615 out_mount_failed: 616 filemap_write_and_wait(sbi->direct_inode->i_mapping); 617 truncate_inode_pages(sbi->direct_inode->i_mapping, 0); 618 make_bad_inode(sbi->direct_inode); 619 iput(sbi->direct_inode); 620 sbi->direct_inode = NULL; 621 out_unload: 622 if (sbi->nls_tab) 623 unload_nls(sbi->nls_tab); 624 out_kfree: 625 kfree(sbi); 626 return ret; 627 } 628 629 static int jfs_freeze(struct super_block *sb) 630 { 631 struct jfs_sb_info *sbi = JFS_SBI(sb); 632 struct jfs_log *log = sbi->log; 633 int rc = 0; 634 635 if (!(sb->s_flags & MS_RDONLY)) { 636 txQuiesce(sb); 637 rc = lmLogShutdown(log); 638 if (rc) { 639 jfs_error(sb, "lmLogShutdown failed\n"); 640 641 /* let operations fail rather than hang */ 642 txResume(sb); 643 644 return rc; 645 } 646 rc = updateSuper(sb, FM_CLEAN); 647 if (rc) { 648 jfs_err("jfs_freeze: updateSuper failed\n"); 649 /* 650 * Don't fail here. Everything succeeded except 651 * marking the superblock clean, so there's really 652 * no harm in leaving it frozen for now. 653 */ 654 } 655 } 656 return 0; 657 } 658 659 static int jfs_unfreeze(struct super_block *sb) 660 { 661 struct jfs_sb_info *sbi = JFS_SBI(sb); 662 struct jfs_log *log = sbi->log; 663 int rc = 0; 664 665 if (!(sb->s_flags & MS_RDONLY)) { 666 rc = updateSuper(sb, FM_MOUNT); 667 if (rc) { 668 jfs_error(sb, "updateSuper failed\n"); 669 goto out; 670 } 671 rc = lmLogInit(log); 672 if (rc) 673 jfs_error(sb, "lmLogInit failed\n"); 674 out: 675 txResume(sb); 676 } 677 return rc; 678 } 679 680 static struct dentry *jfs_do_mount(struct file_system_type *fs_type, 681 int flags, const char *dev_name, void *data) 682 { 683 return mount_bdev(fs_type, flags, dev_name, data, jfs_fill_super); 684 } 685 686 static int jfs_sync_fs(struct super_block *sb, int wait) 687 { 688 struct jfs_log *log = JFS_SBI(sb)->log; 689 690 /* log == NULL indicates read-only mount */ 691 if (log) { 692 /* 693 * Write quota structures to quota file, sync_blockdev() will 694 * write them to disk later 695 */ 696 dquot_writeback_dquots(sb, -1); 697 jfs_flush_journal(log, wait); 698 jfs_syncpt(log, 0); 699 } 700 701 return 0; 702 } 703 704 static int jfs_show_options(struct seq_file *seq, struct dentry *root) 705 { 706 struct jfs_sb_info *sbi = JFS_SBI(root->d_sb); 707 708 if (uid_valid(sbi->uid)) 709 seq_printf(seq, ",uid=%d", from_kuid(&init_user_ns, sbi->uid)); 710 if (gid_valid(sbi->gid)) 711 seq_printf(seq, ",gid=%d", from_kgid(&init_user_ns, sbi->gid)); 712 if (sbi->umask != -1) 713 seq_printf(seq, ",umask=%03o", sbi->umask); 714 if (sbi->flag & JFS_NOINTEGRITY) 715 seq_puts(seq, ",nointegrity"); 716 if (sbi->flag & JFS_DISCARD) 717 seq_printf(seq, ",discard=%u", sbi->minblks_trim); 718 if (sbi->nls_tab) 719 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset); 720 if (sbi->flag & JFS_ERR_CONTINUE) 721 seq_printf(seq, ",errors=continue"); 722 if (sbi->flag & JFS_ERR_PANIC) 723 seq_printf(seq, ",errors=panic"); 724 725 #ifdef CONFIG_QUOTA 726 if (sbi->flag & JFS_USRQUOTA) 727 seq_puts(seq, ",usrquota"); 728 729 if (sbi->flag & JFS_GRPQUOTA) 730 seq_puts(seq, ",grpquota"); 731 #endif 732 733 return 0; 734 } 735 736 #ifdef CONFIG_QUOTA 737 738 /* Read data from quotafile - avoid pagecache and such because we cannot afford 739 * acquiring the locks... As quota files are never truncated and quota code 740 * itself serializes the operations (and no one else should touch the files) 741 * we don't have to be afraid of races */ 742 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data, 743 size_t len, loff_t off) 744 { 745 struct inode *inode = sb_dqopt(sb)->files[type]; 746 sector_t blk = off >> sb->s_blocksize_bits; 747 int err = 0; 748 int offset = off & (sb->s_blocksize - 1); 749 int tocopy; 750 size_t toread; 751 struct buffer_head tmp_bh; 752 struct buffer_head *bh; 753 loff_t i_size = i_size_read(inode); 754 755 if (off > i_size) 756 return 0; 757 if (off+len > i_size) 758 len = i_size-off; 759 toread = len; 760 while (toread > 0) { 761 tocopy = sb->s_blocksize - offset < toread ? 762 sb->s_blocksize - offset : toread; 763 764 tmp_bh.b_state = 0; 765 tmp_bh.b_size = 1 << inode->i_blkbits; 766 err = jfs_get_block(inode, blk, &tmp_bh, 0); 767 if (err) 768 return err; 769 if (!buffer_mapped(&tmp_bh)) /* A hole? */ 770 memset(data, 0, tocopy); 771 else { 772 bh = sb_bread(sb, tmp_bh.b_blocknr); 773 if (!bh) 774 return -EIO; 775 memcpy(data, bh->b_data+offset, tocopy); 776 brelse(bh); 777 } 778 offset = 0; 779 toread -= tocopy; 780 data += tocopy; 781 blk++; 782 } 783 return len; 784 } 785 786 /* Write to quotafile */ 787 static ssize_t jfs_quota_write(struct super_block *sb, int type, 788 const char *data, size_t len, loff_t off) 789 { 790 struct inode *inode = sb_dqopt(sb)->files[type]; 791 sector_t blk = off >> sb->s_blocksize_bits; 792 int err = 0; 793 int offset = off & (sb->s_blocksize - 1); 794 int tocopy; 795 size_t towrite = len; 796 struct buffer_head tmp_bh; 797 struct buffer_head *bh; 798 799 mutex_lock(&inode->i_mutex); 800 while (towrite > 0) { 801 tocopy = sb->s_blocksize - offset < towrite ? 802 sb->s_blocksize - offset : towrite; 803 804 tmp_bh.b_state = 0; 805 tmp_bh.b_size = 1 << inode->i_blkbits; 806 err = jfs_get_block(inode, blk, &tmp_bh, 1); 807 if (err) 808 goto out; 809 if (offset || tocopy != sb->s_blocksize) 810 bh = sb_bread(sb, tmp_bh.b_blocknr); 811 else 812 bh = sb_getblk(sb, tmp_bh.b_blocknr); 813 if (!bh) { 814 err = -EIO; 815 goto out; 816 } 817 lock_buffer(bh); 818 memcpy(bh->b_data+offset, data, tocopy); 819 flush_dcache_page(bh->b_page); 820 set_buffer_uptodate(bh); 821 mark_buffer_dirty(bh); 822 unlock_buffer(bh); 823 brelse(bh); 824 offset = 0; 825 towrite -= tocopy; 826 data += tocopy; 827 blk++; 828 } 829 out: 830 if (len == towrite) { 831 mutex_unlock(&inode->i_mutex); 832 return err; 833 } 834 if (inode->i_size < off+len-towrite) 835 i_size_write(inode, off+len-towrite); 836 inode->i_version++; 837 inode->i_mtime = inode->i_ctime = CURRENT_TIME; 838 mark_inode_dirty(inode); 839 mutex_unlock(&inode->i_mutex); 840 return len - towrite; 841 } 842 843 static struct dquot **jfs_get_dquots(struct inode *inode) 844 { 845 return JFS_IP(inode)->i_dquot; 846 } 847 #endif 848 849 static const struct super_operations jfs_super_operations = { 850 .alloc_inode = jfs_alloc_inode, 851 .destroy_inode = jfs_destroy_inode, 852 .dirty_inode = jfs_dirty_inode, 853 .write_inode = jfs_write_inode, 854 .evict_inode = jfs_evict_inode, 855 .put_super = jfs_put_super, 856 .sync_fs = jfs_sync_fs, 857 .freeze_fs = jfs_freeze, 858 .unfreeze_fs = jfs_unfreeze, 859 .statfs = jfs_statfs, 860 .remount_fs = jfs_remount, 861 .show_options = jfs_show_options, 862 #ifdef CONFIG_QUOTA 863 .quota_read = jfs_quota_read, 864 .quota_write = jfs_quota_write, 865 .get_dquots = jfs_get_dquots, 866 #endif 867 }; 868 869 static const struct export_operations jfs_export_operations = { 870 .fh_to_dentry = jfs_fh_to_dentry, 871 .fh_to_parent = jfs_fh_to_parent, 872 .get_parent = jfs_get_parent, 873 }; 874 875 static struct file_system_type jfs_fs_type = { 876 .owner = THIS_MODULE, 877 .name = "jfs", 878 .mount = jfs_do_mount, 879 .kill_sb = kill_block_super, 880 .fs_flags = FS_REQUIRES_DEV, 881 }; 882 MODULE_ALIAS_FS("jfs"); 883 884 static void init_once(void *foo) 885 { 886 struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo; 887 888 memset(jfs_ip, 0, sizeof(struct jfs_inode_info)); 889 INIT_LIST_HEAD(&jfs_ip->anon_inode_list); 890 init_rwsem(&jfs_ip->rdwrlock); 891 mutex_init(&jfs_ip->commit_mutex); 892 init_rwsem(&jfs_ip->xattr_sem); 893 spin_lock_init(&jfs_ip->ag_lock); 894 jfs_ip->active_ag = -1; 895 inode_init_once(&jfs_ip->vfs_inode); 896 } 897 898 static int __init init_jfs_fs(void) 899 { 900 int i; 901 int rc; 902 903 jfs_inode_cachep = 904 kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0, 905 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, 906 init_once); 907 if (jfs_inode_cachep == NULL) 908 return -ENOMEM; 909 910 /* 911 * Metapage initialization 912 */ 913 rc = metapage_init(); 914 if (rc) { 915 jfs_err("metapage_init failed w/rc = %d", rc); 916 goto free_slab; 917 } 918 919 /* 920 * Transaction Manager initialization 921 */ 922 rc = txInit(); 923 if (rc) { 924 jfs_err("txInit failed w/rc = %d", rc); 925 goto free_metapage; 926 } 927 928 /* 929 * I/O completion thread (endio) 930 */ 931 jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO"); 932 if (IS_ERR(jfsIOthread)) { 933 rc = PTR_ERR(jfsIOthread); 934 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 935 goto end_txmngr; 936 } 937 938 if (commit_threads < 1) 939 commit_threads = num_online_cpus(); 940 if (commit_threads > MAX_COMMIT_THREADS) 941 commit_threads = MAX_COMMIT_THREADS; 942 943 for (i = 0; i < commit_threads; i++) { 944 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, 945 "jfsCommit"); 946 if (IS_ERR(jfsCommitThread[i])) { 947 rc = PTR_ERR(jfsCommitThread[i]); 948 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 949 commit_threads = i; 950 goto kill_committask; 951 } 952 } 953 954 jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync"); 955 if (IS_ERR(jfsSyncThread)) { 956 rc = PTR_ERR(jfsSyncThread); 957 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 958 goto kill_committask; 959 } 960 961 #ifdef PROC_FS_JFS 962 jfs_proc_init(); 963 #endif 964 965 rc = register_filesystem(&jfs_fs_type); 966 if (!rc) 967 return 0; 968 969 #ifdef PROC_FS_JFS 970 jfs_proc_clean(); 971 #endif 972 kthread_stop(jfsSyncThread); 973 kill_committask: 974 for (i = 0; i < commit_threads; i++) 975 kthread_stop(jfsCommitThread[i]); 976 kthread_stop(jfsIOthread); 977 end_txmngr: 978 txExit(); 979 free_metapage: 980 metapage_exit(); 981 free_slab: 982 kmem_cache_destroy(jfs_inode_cachep); 983 return rc; 984 } 985 986 static void __exit exit_jfs_fs(void) 987 { 988 int i; 989 990 jfs_info("exit_jfs_fs called"); 991 992 txExit(); 993 metapage_exit(); 994 995 kthread_stop(jfsIOthread); 996 for (i = 0; i < commit_threads; i++) 997 kthread_stop(jfsCommitThread[i]); 998 kthread_stop(jfsSyncThread); 999 #ifdef PROC_FS_JFS 1000 jfs_proc_clean(); 1001 #endif 1002 unregister_filesystem(&jfs_fs_type); 1003 1004 /* 1005 * Make sure all delayed rcu free inodes are flushed before we 1006 * destroy cache. 1007 */ 1008 rcu_barrier(); 1009 kmem_cache_destroy(jfs_inode_cachep); 1010 } 1011 1012 module_init(init_jfs_fs) 1013 module_exit(exit_jfs_fs) 1014