1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (C) International Business Machines Corp., 2000-2004 4 * Portions Copyright (C) Christoph Hellwig, 2001-2002 5 */ 6 7 #include <linux/fs.h> 8 #include <linux/module.h> 9 #include <linux/parser.h> 10 #include <linux/completion.h> 11 #include <linux/vfs.h> 12 #include <linux/quotaops.h> 13 #include <linux/mount.h> 14 #include <linux/moduleparam.h> 15 #include <linux/kthread.h> 16 #include <linux/posix_acl.h> 17 #include <linux/buffer_head.h> 18 #include <linux/exportfs.h> 19 #include <linux/crc32.h> 20 #include <linux/slab.h> 21 #include <linux/uaccess.h> 22 #include <linux/seq_file.h> 23 #include <linux/blkdev.h> 24 25 #include "jfs_incore.h" 26 #include "jfs_filsys.h" 27 #include "jfs_inode.h" 28 #include "jfs_metapage.h" 29 #include "jfs_superblock.h" 30 #include "jfs_dmap.h" 31 #include "jfs_imap.h" 32 #include "jfs_acl.h" 33 #include "jfs_debug.h" 34 #include "jfs_xattr.h" 35 #include "jfs_dinode.h" 36 37 MODULE_DESCRIPTION("The Journaled Filesystem (JFS)"); 38 MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM"); 39 MODULE_LICENSE("GPL"); 40 41 static struct kmem_cache *jfs_inode_cachep; 42 43 static const struct super_operations jfs_super_operations; 44 static const struct export_operations jfs_export_operations; 45 static struct file_system_type jfs_fs_type; 46 47 #define MAX_COMMIT_THREADS 64 48 static int commit_threads; 49 module_param(commit_threads, int, 0); 50 MODULE_PARM_DESC(commit_threads, "Number of commit threads"); 51 52 static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS]; 53 struct task_struct *jfsIOthread; 54 struct task_struct *jfsSyncThread; 55 56 #ifdef CONFIG_JFS_DEBUG 57 int jfsloglevel = JFS_LOGLEVEL_WARN; 58 module_param(jfsloglevel, int, 0644); 59 MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)"); 60 #endif 61 62 static void jfs_handle_error(struct super_block *sb) 63 { 64 struct jfs_sb_info *sbi = JFS_SBI(sb); 65 66 if (sb_rdonly(sb)) 67 return; 68 69 updateSuper(sb, FM_DIRTY); 70 71 if (sbi->flag & JFS_ERR_PANIC) 72 panic("JFS (device %s): panic forced after error\n", 73 sb->s_id); 74 else if (sbi->flag & JFS_ERR_REMOUNT_RO) { 75 jfs_err("ERROR: (device %s): remounting filesystem as read-only", 76 sb->s_id); 77 sb->s_flags |= SB_RDONLY; 78 } 79 80 /* nothing is done for continue beyond marking the superblock dirty */ 81 } 82 83 void jfs_error(struct super_block *sb, const char *fmt, ...) 84 { 85 struct va_format vaf; 86 va_list args; 87 88 va_start(args, fmt); 89 90 vaf.fmt = fmt; 91 vaf.va = &args; 92 93 pr_err("ERROR: (device %s): %ps: %pV\n", 94 sb->s_id, __builtin_return_address(0), &vaf); 95 96 va_end(args); 97 98 jfs_handle_error(sb); 99 } 100 101 static struct inode *jfs_alloc_inode(struct super_block *sb) 102 { 103 struct jfs_inode_info *jfs_inode; 104 105 jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS); 106 if (!jfs_inode) 107 return NULL; 108 #ifdef CONFIG_QUOTA 109 memset(&jfs_inode->i_dquot, 0, sizeof(jfs_inode->i_dquot)); 110 #endif 111 return &jfs_inode->vfs_inode; 112 } 113 114 static void jfs_free_inode(struct inode *inode) 115 { 116 kmem_cache_free(jfs_inode_cachep, JFS_IP(inode)); 117 } 118 119 static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf) 120 { 121 struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb); 122 s64 maxinodes; 123 struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap; 124 125 jfs_info("In jfs_statfs"); 126 buf->f_type = JFS_SUPER_MAGIC; 127 buf->f_bsize = sbi->bsize; 128 buf->f_blocks = sbi->bmap->db_mapsize; 129 buf->f_bfree = sbi->bmap->db_nfree; 130 buf->f_bavail = sbi->bmap->db_nfree; 131 /* 132 * If we really return the number of allocated & free inodes, some 133 * applications will fail because they won't see enough free inodes. 134 * We'll try to calculate some guess as to how many inodes we can 135 * really allocate 136 * 137 * buf->f_files = atomic_read(&imap->im_numinos); 138 * buf->f_ffree = atomic_read(&imap->im_numfree); 139 */ 140 maxinodes = min((s64) atomic_read(&imap->im_numinos) + 141 ((sbi->bmap->db_nfree >> imap->im_l2nbperiext) 142 << L2INOSPEREXT), (s64) 0xffffffffLL); 143 buf->f_files = maxinodes; 144 buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) - 145 atomic_read(&imap->im_numfree)); 146 buf->f_fsid.val[0] = crc32_le(0, (char *)&sbi->uuid, 147 sizeof(sbi->uuid)/2); 148 buf->f_fsid.val[1] = crc32_le(0, 149 (char *)&sbi->uuid + sizeof(sbi->uuid)/2, 150 sizeof(sbi->uuid)/2); 151 152 buf->f_namelen = JFS_NAME_MAX; 153 return 0; 154 } 155 156 #ifdef CONFIG_QUOTA 157 static int jfs_quota_off(struct super_block *sb, int type); 158 static int jfs_quota_on(struct super_block *sb, int type, int format_id, 159 const struct path *path); 160 161 static void jfs_quota_off_umount(struct super_block *sb) 162 { 163 int type; 164 165 for (type = 0; type < MAXQUOTAS; type++) 166 jfs_quota_off(sb, type); 167 } 168 169 static const struct quotactl_ops jfs_quotactl_ops = { 170 .quota_on = jfs_quota_on, 171 .quota_off = jfs_quota_off, 172 .quota_sync = dquot_quota_sync, 173 .get_state = dquot_get_state, 174 .set_info = dquot_set_dqinfo, 175 .get_dqblk = dquot_get_dqblk, 176 .set_dqblk = dquot_set_dqblk, 177 .get_nextdqblk = dquot_get_next_dqblk, 178 }; 179 #else 180 static inline void jfs_quota_off_umount(struct super_block *sb) 181 { 182 } 183 #endif 184 185 static void jfs_put_super(struct super_block *sb) 186 { 187 struct jfs_sb_info *sbi = JFS_SBI(sb); 188 int rc; 189 190 jfs_info("In jfs_put_super"); 191 192 jfs_quota_off_umount(sb); 193 194 rc = jfs_umount(sb); 195 if (rc) 196 jfs_err("jfs_umount failed with return code %d", rc); 197 198 unload_nls(sbi->nls_tab); 199 200 truncate_inode_pages(sbi->direct_inode->i_mapping, 0); 201 iput(sbi->direct_inode); 202 203 kfree(sbi); 204 } 205 206 enum { 207 Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize, 208 Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota, 209 Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask, 210 Opt_discard, Opt_nodiscard, Opt_discard_minblk 211 }; 212 213 static const match_table_t tokens = { 214 {Opt_integrity, "integrity"}, 215 {Opt_nointegrity, "nointegrity"}, 216 {Opt_iocharset, "iocharset=%s"}, 217 {Opt_resize, "resize=%u"}, 218 {Opt_resize_nosize, "resize"}, 219 {Opt_errors, "errors=%s"}, 220 {Opt_ignore, "noquota"}, 221 {Opt_quota, "quota"}, 222 {Opt_usrquota, "usrquota"}, 223 {Opt_grpquota, "grpquota"}, 224 {Opt_uid, "uid=%u"}, 225 {Opt_gid, "gid=%u"}, 226 {Opt_umask, "umask=%u"}, 227 {Opt_discard, "discard"}, 228 {Opt_nodiscard, "nodiscard"}, 229 {Opt_discard_minblk, "discard=%u"}, 230 {Opt_err, NULL} 231 }; 232 233 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize, 234 int *flag) 235 { 236 void *nls_map = (void *)-1; /* -1: no change; NULL: none */ 237 char *p; 238 struct jfs_sb_info *sbi = JFS_SBI(sb); 239 240 *newLVSize = 0; 241 242 if (!options) 243 return 1; 244 245 while ((p = strsep(&options, ",")) != NULL) { 246 substring_t args[MAX_OPT_ARGS]; 247 int token; 248 if (!*p) 249 continue; 250 251 token = match_token(p, tokens, args); 252 switch (token) { 253 case Opt_integrity: 254 *flag &= ~JFS_NOINTEGRITY; 255 break; 256 case Opt_nointegrity: 257 *flag |= JFS_NOINTEGRITY; 258 break; 259 case Opt_ignore: 260 /* Silently ignore the quota options */ 261 /* Don't do anything ;-) */ 262 break; 263 case Opt_iocharset: 264 if (nls_map && nls_map != (void *) -1) 265 unload_nls(nls_map); 266 if (!strcmp(args[0].from, "none")) 267 nls_map = NULL; 268 else { 269 nls_map = load_nls(args[0].from); 270 if (!nls_map) { 271 pr_err("JFS: charset not found\n"); 272 goto cleanup; 273 } 274 } 275 break; 276 case Opt_resize: 277 { 278 char *resize = args[0].from; 279 int rc = kstrtoll(resize, 0, newLVSize); 280 281 if (rc) 282 goto cleanup; 283 break; 284 } 285 case Opt_resize_nosize: 286 { 287 *newLVSize = sb_bdev_nr_blocks(sb); 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_rdonly(sb)) { 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_rdonly(sb) && !(*flags & SB_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 &= ~SB_RDONLY; 462 463 dquot_resume(sb, -1); 464 return ret; 465 } 466 if (!sb_rdonly(sb) && (*flags & SB_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_rdonly(sb)) { 476 rc = jfs_umount_rw(sb); 477 if (rc) 478 return rc; 479 480 JFS_SBI(sb)->flag = flag; 481 ret = jfs_mount_rw(sb, 1); 482 return ret; 483 } 484 JFS_SBI(sb)->flag = flag; 485 486 return 0; 487 } 488 489 static int jfs_fill_super(struct super_block *sb, void *data, int silent) 490 { 491 struct jfs_sb_info *sbi; 492 struct inode *inode; 493 int rc; 494 s64 newLVSize = 0; 495 int flag, ret = -EINVAL; 496 497 jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags); 498 499 sbi = kzalloc(sizeof(struct jfs_sb_info), GFP_KERNEL); 500 if (!sbi) 501 return -ENOMEM; 502 503 sb->s_fs_info = sbi; 504 sb->s_max_links = JFS_LINK_MAX; 505 sb->s_time_min = 0; 506 sb->s_time_max = U32_MAX; 507 sbi->sb = sb; 508 sbi->uid = INVALID_UID; 509 sbi->gid = INVALID_GID; 510 sbi->umask = -1; 511 512 /* initialize the mount flag and determine the default error handler */ 513 flag = JFS_ERR_REMOUNT_RO; 514 515 if (!parse_options((char *) data, sb, &newLVSize, &flag)) 516 goto out_kfree; 517 sbi->flag = flag; 518 519 #ifdef CONFIG_JFS_POSIX_ACL 520 sb->s_flags |= SB_POSIXACL; 521 #endif 522 523 if (newLVSize) { 524 pr_err("resize option for remount only\n"); 525 goto out_kfree; 526 } 527 528 /* 529 * Initialize blocksize to 4K. 530 */ 531 sb_set_blocksize(sb, PSIZE); 532 533 /* 534 * Set method vectors. 535 */ 536 sb->s_op = &jfs_super_operations; 537 sb->s_export_op = &jfs_export_operations; 538 sb->s_xattr = jfs_xattr_handlers; 539 #ifdef CONFIG_QUOTA 540 sb->dq_op = &dquot_operations; 541 sb->s_qcop = &jfs_quotactl_ops; 542 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; 543 #endif 544 545 /* 546 * Initialize direct-mapping inode/address-space 547 */ 548 inode = new_inode(sb); 549 if (inode == NULL) { 550 ret = -ENOMEM; 551 goto out_unload; 552 } 553 inode->i_size = bdev_nr_bytes(sb->s_bdev); 554 inode->i_mapping->a_ops = &jfs_metapage_aops; 555 inode_fake_hash(inode); 556 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS); 557 558 sbi->direct_inode = inode; 559 560 rc = jfs_mount(sb); 561 if (rc) { 562 if (!silent) 563 jfs_err("jfs_mount failed w/return code = %d", rc); 564 goto out_mount_failed; 565 } 566 if (sb_rdonly(sb)) 567 sbi->log = NULL; 568 else { 569 rc = jfs_mount_rw(sb, 0); 570 if (rc) { 571 if (!silent) { 572 jfs_err("jfs_mount_rw failed, return code = %d", 573 rc); 574 } 575 goto out_no_rw; 576 } 577 } 578 579 sb->s_magic = JFS_SUPER_MAGIC; 580 581 if (sbi->mntflag & JFS_OS2) 582 sb->s_d_op = &jfs_ci_dentry_operations; 583 584 inode = jfs_iget(sb, ROOT_I); 585 if (IS_ERR(inode)) { 586 ret = PTR_ERR(inode); 587 goto out_no_rw; 588 } 589 sb->s_root = d_make_root(inode); 590 if (!sb->s_root) 591 goto out_no_root; 592 593 /* logical blocks are represented by 40 bits in pxd_t, etc. 594 * and page cache is indexed by long 595 */ 596 sb->s_maxbytes = min(((loff_t)sb->s_blocksize) << 40, MAX_LFS_FILESIZE); 597 sb->s_time_gran = 1; 598 return 0; 599 600 out_no_root: 601 jfs_err("jfs_read_super: get root dentry failed"); 602 603 out_no_rw: 604 rc = jfs_umount(sb); 605 if (rc) 606 jfs_err("jfs_umount failed with return code %d", rc); 607 out_mount_failed: 608 filemap_write_and_wait(sbi->direct_inode->i_mapping); 609 truncate_inode_pages(sbi->direct_inode->i_mapping, 0); 610 make_bad_inode(sbi->direct_inode); 611 iput(sbi->direct_inode); 612 sbi->direct_inode = NULL; 613 out_unload: 614 unload_nls(sbi->nls_tab); 615 out_kfree: 616 kfree(sbi); 617 return ret; 618 } 619 620 static int jfs_freeze(struct super_block *sb) 621 { 622 struct jfs_sb_info *sbi = JFS_SBI(sb); 623 struct jfs_log *log = sbi->log; 624 int rc = 0; 625 626 if (!sb_rdonly(sb)) { 627 txQuiesce(sb); 628 rc = lmLogShutdown(log); 629 if (rc) { 630 jfs_error(sb, "lmLogShutdown failed\n"); 631 632 /* let operations fail rather than hang */ 633 txResume(sb); 634 635 return rc; 636 } 637 rc = updateSuper(sb, FM_CLEAN); 638 if (rc) { 639 jfs_err("jfs_freeze: updateSuper failed"); 640 /* 641 * Don't fail here. Everything succeeded except 642 * marking the superblock clean, so there's really 643 * no harm in leaving it frozen for now. 644 */ 645 } 646 } 647 return 0; 648 } 649 650 static int jfs_unfreeze(struct super_block *sb) 651 { 652 struct jfs_sb_info *sbi = JFS_SBI(sb); 653 struct jfs_log *log = sbi->log; 654 int rc = 0; 655 656 if (!sb_rdonly(sb)) { 657 rc = updateSuper(sb, FM_MOUNT); 658 if (rc) { 659 jfs_error(sb, "updateSuper failed\n"); 660 goto out; 661 } 662 rc = lmLogInit(log); 663 if (rc) 664 jfs_error(sb, "lmLogInit failed\n"); 665 out: 666 txResume(sb); 667 } 668 return rc; 669 } 670 671 static struct dentry *jfs_do_mount(struct file_system_type *fs_type, 672 int flags, const char *dev_name, void *data) 673 { 674 return mount_bdev(fs_type, flags, dev_name, data, jfs_fill_super); 675 } 676 677 static int jfs_sync_fs(struct super_block *sb, int wait) 678 { 679 struct jfs_log *log = JFS_SBI(sb)->log; 680 681 /* log == NULL indicates read-only mount */ 682 if (log) { 683 /* 684 * Write quota structures to quota file, sync_blockdev() will 685 * write them to disk later 686 */ 687 dquot_writeback_dquots(sb, -1); 688 jfs_flush_journal(log, wait); 689 jfs_syncpt(log, 0); 690 } 691 692 return 0; 693 } 694 695 static int jfs_show_options(struct seq_file *seq, struct dentry *root) 696 { 697 struct jfs_sb_info *sbi = JFS_SBI(root->d_sb); 698 699 if (uid_valid(sbi->uid)) 700 seq_printf(seq, ",uid=%d", from_kuid(&init_user_ns, sbi->uid)); 701 if (gid_valid(sbi->gid)) 702 seq_printf(seq, ",gid=%d", from_kgid(&init_user_ns, sbi->gid)); 703 if (sbi->umask != -1) 704 seq_printf(seq, ",umask=%03o", sbi->umask); 705 if (sbi->flag & JFS_NOINTEGRITY) 706 seq_puts(seq, ",nointegrity"); 707 if (sbi->flag & JFS_DISCARD) 708 seq_printf(seq, ",discard=%u", sbi->minblks_trim); 709 if (sbi->nls_tab) 710 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset); 711 if (sbi->flag & JFS_ERR_CONTINUE) 712 seq_printf(seq, ",errors=continue"); 713 if (sbi->flag & JFS_ERR_PANIC) 714 seq_printf(seq, ",errors=panic"); 715 716 #ifdef CONFIG_QUOTA 717 if (sbi->flag & JFS_USRQUOTA) 718 seq_puts(seq, ",usrquota"); 719 720 if (sbi->flag & JFS_GRPQUOTA) 721 seq_puts(seq, ",grpquota"); 722 #endif 723 724 return 0; 725 } 726 727 #ifdef CONFIG_QUOTA 728 729 /* Read data from quotafile - avoid pagecache and such because we cannot afford 730 * acquiring the locks... As quota files are never truncated and quota code 731 * itself serializes the operations (and no one else should touch the files) 732 * we don't have to be afraid of races */ 733 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data, 734 size_t len, loff_t off) 735 { 736 struct inode *inode = sb_dqopt(sb)->files[type]; 737 sector_t blk = off >> sb->s_blocksize_bits; 738 int err = 0; 739 int offset = off & (sb->s_blocksize - 1); 740 int tocopy; 741 size_t toread; 742 struct buffer_head tmp_bh; 743 struct buffer_head *bh; 744 loff_t i_size = i_size_read(inode); 745 746 if (off > i_size) 747 return 0; 748 if (off+len > i_size) 749 len = i_size-off; 750 toread = len; 751 while (toread > 0) { 752 tocopy = sb->s_blocksize - offset < toread ? 753 sb->s_blocksize - offset : toread; 754 755 tmp_bh.b_state = 0; 756 tmp_bh.b_size = i_blocksize(inode); 757 err = jfs_get_block(inode, blk, &tmp_bh, 0); 758 if (err) 759 return err; 760 if (!buffer_mapped(&tmp_bh)) /* A hole? */ 761 memset(data, 0, tocopy); 762 else { 763 bh = sb_bread(sb, tmp_bh.b_blocknr); 764 if (!bh) 765 return -EIO; 766 memcpy(data, bh->b_data+offset, tocopy); 767 brelse(bh); 768 } 769 offset = 0; 770 toread -= tocopy; 771 data += tocopy; 772 blk++; 773 } 774 return len; 775 } 776 777 /* Write to quotafile */ 778 static ssize_t jfs_quota_write(struct super_block *sb, int type, 779 const char *data, size_t len, loff_t off) 780 { 781 struct inode *inode = sb_dqopt(sb)->files[type]; 782 sector_t blk = off >> sb->s_blocksize_bits; 783 int err = 0; 784 int offset = off & (sb->s_blocksize - 1); 785 int tocopy; 786 size_t towrite = len; 787 struct buffer_head tmp_bh; 788 struct buffer_head *bh; 789 790 inode_lock(inode); 791 while (towrite > 0) { 792 tocopy = sb->s_blocksize - offset < towrite ? 793 sb->s_blocksize - offset : towrite; 794 795 tmp_bh.b_state = 0; 796 tmp_bh.b_size = i_blocksize(inode); 797 err = jfs_get_block(inode, blk, &tmp_bh, 1); 798 if (err) 799 goto out; 800 if (offset || tocopy != sb->s_blocksize) 801 bh = sb_bread(sb, tmp_bh.b_blocknr); 802 else 803 bh = sb_getblk(sb, tmp_bh.b_blocknr); 804 if (!bh) { 805 err = -EIO; 806 goto out; 807 } 808 lock_buffer(bh); 809 memcpy(bh->b_data+offset, data, tocopy); 810 flush_dcache_page(bh->b_page); 811 set_buffer_uptodate(bh); 812 mark_buffer_dirty(bh); 813 unlock_buffer(bh); 814 brelse(bh); 815 offset = 0; 816 towrite -= tocopy; 817 data += tocopy; 818 blk++; 819 } 820 out: 821 if (len == towrite) { 822 inode_unlock(inode); 823 return err; 824 } 825 if (inode->i_size < off+len-towrite) 826 i_size_write(inode, off+len-towrite); 827 inode->i_mtime = inode->i_ctime = current_time(inode); 828 mark_inode_dirty(inode); 829 inode_unlock(inode); 830 return len - towrite; 831 } 832 833 static struct dquot **jfs_get_dquots(struct inode *inode) 834 { 835 return JFS_IP(inode)->i_dquot; 836 } 837 838 static int jfs_quota_on(struct super_block *sb, int type, int format_id, 839 const struct path *path) 840 { 841 int err; 842 struct inode *inode; 843 844 err = dquot_quota_on(sb, type, format_id, path); 845 if (err) 846 return err; 847 848 inode = d_inode(path->dentry); 849 inode_lock(inode); 850 JFS_IP(inode)->mode2 |= JFS_NOATIME_FL | JFS_IMMUTABLE_FL; 851 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE, 852 S_NOATIME | S_IMMUTABLE); 853 inode_unlock(inode); 854 mark_inode_dirty(inode); 855 856 return 0; 857 } 858 859 static int jfs_quota_off(struct super_block *sb, int type) 860 { 861 struct inode *inode = sb_dqopt(sb)->files[type]; 862 int err; 863 864 if (!inode || !igrab(inode)) 865 goto out; 866 867 err = dquot_quota_off(sb, type); 868 if (err) 869 goto out_put; 870 871 inode_lock(inode); 872 JFS_IP(inode)->mode2 &= ~(JFS_NOATIME_FL | JFS_IMMUTABLE_FL); 873 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE); 874 inode_unlock(inode); 875 mark_inode_dirty(inode); 876 out_put: 877 iput(inode); 878 return err; 879 out: 880 return dquot_quota_off(sb, type); 881 } 882 #endif 883 884 static const struct super_operations jfs_super_operations = { 885 .alloc_inode = jfs_alloc_inode, 886 .free_inode = jfs_free_inode, 887 .dirty_inode = jfs_dirty_inode, 888 .write_inode = jfs_write_inode, 889 .evict_inode = jfs_evict_inode, 890 .put_super = jfs_put_super, 891 .sync_fs = jfs_sync_fs, 892 .freeze_fs = jfs_freeze, 893 .unfreeze_fs = jfs_unfreeze, 894 .statfs = jfs_statfs, 895 .remount_fs = jfs_remount, 896 .show_options = jfs_show_options, 897 #ifdef CONFIG_QUOTA 898 .quota_read = jfs_quota_read, 899 .quota_write = jfs_quota_write, 900 .get_dquots = jfs_get_dquots, 901 #endif 902 }; 903 904 static const struct export_operations jfs_export_operations = { 905 .fh_to_dentry = jfs_fh_to_dentry, 906 .fh_to_parent = jfs_fh_to_parent, 907 .get_parent = jfs_get_parent, 908 }; 909 910 static struct file_system_type jfs_fs_type = { 911 .owner = THIS_MODULE, 912 .name = "jfs", 913 .mount = jfs_do_mount, 914 .kill_sb = kill_block_super, 915 .fs_flags = FS_REQUIRES_DEV, 916 }; 917 MODULE_ALIAS_FS("jfs"); 918 919 static void init_once(void *foo) 920 { 921 struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo; 922 923 memset(jfs_ip, 0, sizeof(struct jfs_inode_info)); 924 INIT_LIST_HEAD(&jfs_ip->anon_inode_list); 925 init_rwsem(&jfs_ip->rdwrlock); 926 mutex_init(&jfs_ip->commit_mutex); 927 init_rwsem(&jfs_ip->xattr_sem); 928 spin_lock_init(&jfs_ip->ag_lock); 929 jfs_ip->active_ag = -1; 930 inode_init_once(&jfs_ip->vfs_inode); 931 } 932 933 static int __init init_jfs_fs(void) 934 { 935 int i; 936 int rc; 937 938 jfs_inode_cachep = 939 kmem_cache_create_usercopy("jfs_ip", sizeof(struct jfs_inode_info), 940 0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|SLAB_ACCOUNT, 941 offsetof(struct jfs_inode_info, i_inline_all), 942 sizeof_field(struct jfs_inode_info, i_inline_all), 943 init_once); 944 if (jfs_inode_cachep == NULL) 945 return -ENOMEM; 946 947 /* 948 * Metapage initialization 949 */ 950 rc = metapage_init(); 951 if (rc) { 952 jfs_err("metapage_init failed w/rc = %d", rc); 953 goto free_slab; 954 } 955 956 /* 957 * Transaction Manager initialization 958 */ 959 rc = txInit(); 960 if (rc) { 961 jfs_err("txInit failed w/rc = %d", rc); 962 goto free_metapage; 963 } 964 965 /* 966 * I/O completion thread (endio) 967 */ 968 jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO"); 969 if (IS_ERR(jfsIOthread)) { 970 rc = PTR_ERR(jfsIOthread); 971 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 972 goto end_txmngr; 973 } 974 975 if (commit_threads < 1) 976 commit_threads = num_online_cpus(); 977 if (commit_threads > MAX_COMMIT_THREADS) 978 commit_threads = MAX_COMMIT_THREADS; 979 980 for (i = 0; i < commit_threads; i++) { 981 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, 982 "jfsCommit"); 983 if (IS_ERR(jfsCommitThread[i])) { 984 rc = PTR_ERR(jfsCommitThread[i]); 985 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 986 commit_threads = i; 987 goto kill_committask; 988 } 989 } 990 991 jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync"); 992 if (IS_ERR(jfsSyncThread)) { 993 rc = PTR_ERR(jfsSyncThread); 994 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 995 goto kill_committask; 996 } 997 998 #ifdef PROC_FS_JFS 999 jfs_proc_init(); 1000 #endif 1001 1002 rc = register_filesystem(&jfs_fs_type); 1003 if (!rc) 1004 return 0; 1005 1006 #ifdef PROC_FS_JFS 1007 jfs_proc_clean(); 1008 #endif 1009 kthread_stop(jfsSyncThread); 1010 kill_committask: 1011 for (i = 0; i < commit_threads; i++) 1012 kthread_stop(jfsCommitThread[i]); 1013 kthread_stop(jfsIOthread); 1014 end_txmngr: 1015 txExit(); 1016 free_metapage: 1017 metapage_exit(); 1018 free_slab: 1019 kmem_cache_destroy(jfs_inode_cachep); 1020 return rc; 1021 } 1022 1023 static void __exit exit_jfs_fs(void) 1024 { 1025 int i; 1026 1027 jfs_info("exit_jfs_fs called"); 1028 1029 txExit(); 1030 metapage_exit(); 1031 1032 kthread_stop(jfsIOthread); 1033 for (i = 0; i < commit_threads; i++) 1034 kthread_stop(jfsCommitThread[i]); 1035 kthread_stop(jfsSyncThread); 1036 #ifdef PROC_FS_JFS 1037 jfs_proc_clean(); 1038 #endif 1039 unregister_filesystem(&jfs_fs_type); 1040 1041 /* 1042 * Make sure all delayed rcu free inodes are flushed before we 1043 * destroy cache. 1044 */ 1045 rcu_barrier(); 1046 kmem_cache_destroy(jfs_inode_cachep); 1047 } 1048 1049 module_init(init_jfs_fs) 1050 module_exit(exit_jfs_fs) 1051