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 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 int rc = kstrtoll(resize, 0, newLVSize); 276 277 if (rc) 278 goto cleanup; 279 break; 280 } 281 case Opt_resize_nosize: 282 { 283 *newLVSize = sb->s_bdev->bd_inode->i_size >> 284 sb->s_blocksize_bits; 285 if (*newLVSize == 0) 286 pr_err("JFS: Cannot determine volume size\n"); 287 break; 288 } 289 case Opt_errors: 290 { 291 char *errors = args[0].from; 292 if (!errors || !*errors) 293 goto cleanup; 294 if (!strcmp(errors, "continue")) { 295 *flag &= ~JFS_ERR_REMOUNT_RO; 296 *flag &= ~JFS_ERR_PANIC; 297 *flag |= JFS_ERR_CONTINUE; 298 } else if (!strcmp(errors, "remount-ro")) { 299 *flag &= ~JFS_ERR_CONTINUE; 300 *flag &= ~JFS_ERR_PANIC; 301 *flag |= JFS_ERR_REMOUNT_RO; 302 } else if (!strcmp(errors, "panic")) { 303 *flag &= ~JFS_ERR_CONTINUE; 304 *flag &= ~JFS_ERR_REMOUNT_RO; 305 *flag |= JFS_ERR_PANIC; 306 } else { 307 pr_err("JFS: %s is an invalid error handler\n", 308 errors); 309 goto cleanup; 310 } 311 break; 312 } 313 314 #ifdef CONFIG_QUOTA 315 case Opt_quota: 316 case Opt_usrquota: 317 *flag |= JFS_USRQUOTA; 318 break; 319 case Opt_grpquota: 320 *flag |= JFS_GRPQUOTA; 321 break; 322 #else 323 case Opt_usrquota: 324 case Opt_grpquota: 325 case Opt_quota: 326 pr_err("JFS: quota operations not supported\n"); 327 break; 328 #endif 329 case Opt_uid: 330 { 331 char *uid = args[0].from; 332 uid_t val; 333 int rc = kstrtouint(uid, 0, &val); 334 335 if (rc) 336 goto cleanup; 337 sbi->uid = make_kuid(current_user_ns(), val); 338 if (!uid_valid(sbi->uid)) 339 goto cleanup; 340 break; 341 } 342 343 case Opt_gid: 344 { 345 char *gid = args[0].from; 346 gid_t val; 347 int rc = kstrtouint(gid, 0, &val); 348 349 if (rc) 350 goto cleanup; 351 sbi->gid = make_kgid(current_user_ns(), val); 352 if (!gid_valid(sbi->gid)) 353 goto cleanup; 354 break; 355 } 356 357 case Opt_umask: 358 { 359 char *umask = args[0].from; 360 int rc = kstrtouint(umask, 8, &sbi->umask); 361 362 if (rc) 363 goto cleanup; 364 if (sbi->umask & ~0777) { 365 pr_err("JFS: Invalid value of umask\n"); 366 goto cleanup; 367 } 368 break; 369 } 370 371 case Opt_discard: 372 { 373 struct request_queue *q = bdev_get_queue(sb->s_bdev); 374 /* if set to 1, even copying files will cause 375 * trimming :O 376 * -> user has more control over the online trimming 377 */ 378 sbi->minblks_trim = 64; 379 if (blk_queue_discard(q)) 380 *flag |= JFS_DISCARD; 381 else 382 pr_err("JFS: discard option not supported on device\n"); 383 break; 384 } 385 386 case Opt_nodiscard: 387 *flag &= ~JFS_DISCARD; 388 break; 389 390 case Opt_discard_minblk: 391 { 392 struct request_queue *q = bdev_get_queue(sb->s_bdev); 393 char *minblks_trim = args[0].from; 394 int rc; 395 if (blk_queue_discard(q)) { 396 *flag |= JFS_DISCARD; 397 rc = kstrtouint(minblks_trim, 0, 398 &sbi->minblks_trim); 399 if (rc) 400 goto cleanup; 401 } else 402 pr_err("JFS: discard option not supported on device\n"); 403 break; 404 } 405 406 default: 407 printk("jfs: Unrecognized mount option \"%s\" or missing value\n", 408 p); 409 goto cleanup; 410 } 411 } 412 413 if (nls_map != (void *) -1) { 414 /* Discard old (if remount) */ 415 unload_nls(sbi->nls_tab); 416 sbi->nls_tab = nls_map; 417 } 418 return 1; 419 420 cleanup: 421 if (nls_map && nls_map != (void *) -1) 422 unload_nls(nls_map); 423 return 0; 424 } 425 426 static int jfs_remount(struct super_block *sb, int *flags, char *data) 427 { 428 s64 newLVSize = 0; 429 int rc = 0; 430 int flag = JFS_SBI(sb)->flag; 431 int ret; 432 433 sync_filesystem(sb); 434 if (!parse_options(data, sb, &newLVSize, &flag)) 435 return -EINVAL; 436 437 if (newLVSize) { 438 if (sb->s_flags & MS_RDONLY) { 439 pr_err("JFS: resize requires volume to be mounted read-write\n"); 440 return -EROFS; 441 } 442 rc = jfs_extendfs(sb, newLVSize, 0); 443 if (rc) 444 return rc; 445 } 446 447 if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) { 448 /* 449 * Invalidate any previously read metadata. fsck may have 450 * changed the on-disk data since we mounted r/o 451 */ 452 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0); 453 454 JFS_SBI(sb)->flag = flag; 455 ret = jfs_mount_rw(sb, 1); 456 457 /* mark the fs r/w for quota activity */ 458 sb->s_flags &= ~MS_RDONLY; 459 460 dquot_resume(sb, -1); 461 return ret; 462 } 463 if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) { 464 rc = dquot_suspend(sb, -1); 465 if (rc < 0) 466 return rc; 467 rc = jfs_umount_rw(sb); 468 JFS_SBI(sb)->flag = flag; 469 return rc; 470 } 471 if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY)) 472 if (!(sb->s_flags & MS_RDONLY)) { 473 rc = jfs_umount_rw(sb); 474 if (rc) 475 return rc; 476 477 JFS_SBI(sb)->flag = flag; 478 ret = jfs_mount_rw(sb, 1); 479 return ret; 480 } 481 JFS_SBI(sb)->flag = flag; 482 483 return 0; 484 } 485 486 static int jfs_fill_super(struct super_block *sb, void *data, int silent) 487 { 488 struct jfs_sb_info *sbi; 489 struct inode *inode; 490 int rc; 491 s64 newLVSize = 0; 492 int flag, ret = -EINVAL; 493 494 jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags); 495 496 if (!new_valid_dev(sb->s_bdev->bd_dev)) 497 return -EOVERFLOW; 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 #endif 541 542 /* 543 * Initialize direct-mapping inode/address-space 544 */ 545 inode = new_inode(sb); 546 if (inode == NULL) { 547 ret = -ENOMEM; 548 goto out_unload; 549 } 550 inode->i_ino = 0; 551 inode->i_size = sb->s_bdev->bd_inode->i_size; 552 inode->i_mapping->a_ops = &jfs_metapage_aops; 553 insert_inode_hash(inode); 554 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS); 555 556 sbi->direct_inode = inode; 557 558 rc = jfs_mount(sb); 559 if (rc) { 560 if (!silent) 561 jfs_err("jfs_mount failed w/return code = %d", rc); 562 goto out_mount_failed; 563 } 564 if (sb->s_flags & MS_RDONLY) 565 sbi->log = NULL; 566 else { 567 rc = jfs_mount_rw(sb, 0); 568 if (rc) { 569 if (!silent) { 570 jfs_err("jfs_mount_rw failed, return code = %d", 571 rc); 572 } 573 goto out_no_rw; 574 } 575 } 576 577 sb->s_magic = JFS_SUPER_MAGIC; 578 579 if (sbi->mntflag & JFS_OS2) 580 sb->s_d_op = &jfs_ci_dentry_operations; 581 582 inode = jfs_iget(sb, ROOT_I); 583 if (IS_ERR(inode)) { 584 ret = PTR_ERR(inode); 585 goto out_no_rw; 586 } 587 sb->s_root = d_make_root(inode); 588 if (!sb->s_root) 589 goto out_no_root; 590 591 /* logical blocks are represented by 40 bits in pxd_t, etc. */ 592 sb->s_maxbytes = ((u64) sb->s_blocksize) << 40; 593 #if BITS_PER_LONG == 32 594 /* 595 * Page cache is indexed by long. 596 * I would use MAX_LFS_FILESIZE, but it's only half as big 597 */ 598 sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, 599 (u64)sb->s_maxbytes); 600 #endif 601 sb->s_time_gran = 1; 602 return 0; 603 604 out_no_root: 605 jfs_err("jfs_read_super: get root dentry failed"); 606 607 out_no_rw: 608 rc = jfs_umount(sb); 609 if (rc) 610 jfs_err("jfs_umount failed with return code %d", rc); 611 out_mount_failed: 612 filemap_write_and_wait(sbi->direct_inode->i_mapping); 613 truncate_inode_pages(sbi->direct_inode->i_mapping, 0); 614 make_bad_inode(sbi->direct_inode); 615 iput(sbi->direct_inode); 616 sbi->direct_inode = NULL; 617 out_unload: 618 if (sbi->nls_tab) 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\n"); 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 = 1 << inode->i_blkbits; 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 mutex_lock(&inode->i_mutex); 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 = 1 << inode->i_blkbits; 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 mutex_unlock(&inode->i_mutex); 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; 834 mark_inode_dirty(inode); 835 mutex_unlock(&inode->i_mutex); 836 return len - towrite; 837 } 838 839 #endif 840 841 static const struct super_operations jfs_super_operations = { 842 .alloc_inode = jfs_alloc_inode, 843 .destroy_inode = jfs_destroy_inode, 844 .dirty_inode = jfs_dirty_inode, 845 .write_inode = jfs_write_inode, 846 .evict_inode = jfs_evict_inode, 847 .put_super = jfs_put_super, 848 .sync_fs = jfs_sync_fs, 849 .freeze_fs = jfs_freeze, 850 .unfreeze_fs = jfs_unfreeze, 851 .statfs = jfs_statfs, 852 .remount_fs = jfs_remount, 853 .show_options = jfs_show_options, 854 #ifdef CONFIG_QUOTA 855 .quota_read = jfs_quota_read, 856 .quota_write = jfs_quota_write, 857 #endif 858 }; 859 860 static const struct export_operations jfs_export_operations = { 861 .fh_to_dentry = jfs_fh_to_dentry, 862 .fh_to_parent = jfs_fh_to_parent, 863 .get_parent = jfs_get_parent, 864 }; 865 866 static struct file_system_type jfs_fs_type = { 867 .owner = THIS_MODULE, 868 .name = "jfs", 869 .mount = jfs_do_mount, 870 .kill_sb = kill_block_super, 871 .fs_flags = FS_REQUIRES_DEV, 872 }; 873 MODULE_ALIAS_FS("jfs"); 874 875 static void init_once(void *foo) 876 { 877 struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo; 878 879 memset(jfs_ip, 0, sizeof(struct jfs_inode_info)); 880 INIT_LIST_HEAD(&jfs_ip->anon_inode_list); 881 init_rwsem(&jfs_ip->rdwrlock); 882 mutex_init(&jfs_ip->commit_mutex); 883 init_rwsem(&jfs_ip->xattr_sem); 884 spin_lock_init(&jfs_ip->ag_lock); 885 jfs_ip->active_ag = -1; 886 inode_init_once(&jfs_ip->vfs_inode); 887 } 888 889 static int __init init_jfs_fs(void) 890 { 891 int i; 892 int rc; 893 894 jfs_inode_cachep = 895 kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0, 896 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, 897 init_once); 898 if (jfs_inode_cachep == NULL) 899 return -ENOMEM; 900 901 /* 902 * Metapage initialization 903 */ 904 rc = metapage_init(); 905 if (rc) { 906 jfs_err("metapage_init failed w/rc = %d", rc); 907 goto free_slab; 908 } 909 910 /* 911 * Transaction Manager initialization 912 */ 913 rc = txInit(); 914 if (rc) { 915 jfs_err("txInit failed w/rc = %d", rc); 916 goto free_metapage; 917 } 918 919 /* 920 * I/O completion thread (endio) 921 */ 922 jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO"); 923 if (IS_ERR(jfsIOthread)) { 924 rc = PTR_ERR(jfsIOthread); 925 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 926 goto end_txmngr; 927 } 928 929 if (commit_threads < 1) 930 commit_threads = num_online_cpus(); 931 if (commit_threads > MAX_COMMIT_THREADS) 932 commit_threads = MAX_COMMIT_THREADS; 933 934 for (i = 0; i < commit_threads; i++) { 935 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, 936 "jfsCommit"); 937 if (IS_ERR(jfsCommitThread[i])) { 938 rc = PTR_ERR(jfsCommitThread[i]); 939 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 940 commit_threads = i; 941 goto kill_committask; 942 } 943 } 944 945 jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync"); 946 if (IS_ERR(jfsSyncThread)) { 947 rc = PTR_ERR(jfsSyncThread); 948 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 949 goto kill_committask; 950 } 951 952 #ifdef PROC_FS_JFS 953 jfs_proc_init(); 954 #endif 955 956 rc = register_filesystem(&jfs_fs_type); 957 if (!rc) 958 return 0; 959 960 #ifdef PROC_FS_JFS 961 jfs_proc_clean(); 962 #endif 963 kthread_stop(jfsSyncThread); 964 kill_committask: 965 for (i = 0; i < commit_threads; i++) 966 kthread_stop(jfsCommitThread[i]); 967 kthread_stop(jfsIOthread); 968 end_txmngr: 969 txExit(); 970 free_metapage: 971 metapage_exit(); 972 free_slab: 973 kmem_cache_destroy(jfs_inode_cachep); 974 return rc; 975 } 976 977 static void __exit exit_jfs_fs(void) 978 { 979 int i; 980 981 jfs_info("exit_jfs_fs called"); 982 983 txExit(); 984 metapage_exit(); 985 986 kthread_stop(jfsIOthread); 987 for (i = 0; i < commit_threads; i++) 988 kthread_stop(jfsCommitThread[i]); 989 kthread_stop(jfsSyncThread); 990 #ifdef PROC_FS_JFS 991 jfs_proc_clean(); 992 #endif 993 unregister_filesystem(&jfs_fs_type); 994 995 /* 996 * Make sure all delayed rcu free inodes are flushed before we 997 * destroy cache. 998 */ 999 rcu_barrier(); 1000 kmem_cache_destroy(jfs_inode_cachep); 1001 } 1002 1003 module_init(init_jfs_fs) 1004 module_exit(exit_jfs_fs) 1005