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 = alloc_inode_sb(sb, 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 /* if set to 1, even copying files will cause 376 * trimming :O 377 * -> user has more control over the online trimming 378 */ 379 sbi->minblks_trim = 64; 380 if (bdev_max_discard_sectors(sb->s_bdev)) 381 *flag |= JFS_DISCARD; 382 else 383 pr_err("JFS: discard option not supported on device\n"); 384 break; 385 386 case Opt_nodiscard: 387 *flag &= ~JFS_DISCARD; 388 break; 389 390 case Opt_discard_minblk: 391 { 392 char *minblks_trim = args[0].from; 393 int rc; 394 if (bdev_max_discard_sectors(sb->s_bdev)) { 395 *flag |= JFS_DISCARD; 396 rc = kstrtouint(minblks_trim, 0, 397 &sbi->minblks_trim); 398 if (rc) 399 goto cleanup; 400 } else 401 pr_err("JFS: discard option not supported on device\n"); 402 break; 403 } 404 405 default: 406 printk("jfs: Unrecognized mount option \"%s\" or missing value\n", 407 p); 408 goto cleanup; 409 } 410 } 411 412 if (nls_map != (void *) -1) { 413 /* Discard old (if remount) */ 414 unload_nls(sbi->nls_tab); 415 sbi->nls_tab = nls_map; 416 } 417 return 1; 418 419 cleanup: 420 if (nls_map && nls_map != (void *) -1) 421 unload_nls(nls_map); 422 return 0; 423 } 424 425 static int jfs_remount(struct super_block *sb, int *flags, char *data) 426 { 427 s64 newLVSize = 0; 428 int rc = 0; 429 int flag = JFS_SBI(sb)->flag; 430 int ret; 431 432 sync_filesystem(sb); 433 if (!parse_options(data, sb, &newLVSize, &flag)) 434 return -EINVAL; 435 436 if (newLVSize) { 437 if (sb_rdonly(sb)) { 438 pr_err("JFS: resize requires volume to be mounted read-write\n"); 439 return -EROFS; 440 } 441 rc = jfs_extendfs(sb, newLVSize, 0); 442 if (rc) 443 return rc; 444 } 445 446 if (sb_rdonly(sb) && !(*flags & SB_RDONLY)) { 447 /* 448 * Invalidate any previously read metadata. fsck may have 449 * changed the on-disk data since we mounted r/o 450 */ 451 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0); 452 453 JFS_SBI(sb)->flag = flag; 454 ret = jfs_mount_rw(sb, 1); 455 456 /* mark the fs r/w for quota activity */ 457 sb->s_flags &= ~SB_RDONLY; 458 459 dquot_resume(sb, -1); 460 return ret; 461 } 462 if (!sb_rdonly(sb) && (*flags & SB_RDONLY)) { 463 rc = dquot_suspend(sb, -1); 464 if (rc < 0) 465 return rc; 466 rc = jfs_umount_rw(sb); 467 JFS_SBI(sb)->flag = flag; 468 return rc; 469 } 470 if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY)) 471 if (!sb_rdonly(sb)) { 472 rc = jfs_umount_rw(sb); 473 if (rc) 474 return rc; 475 476 JFS_SBI(sb)->flag = flag; 477 ret = jfs_mount_rw(sb, 1); 478 return ret; 479 } 480 JFS_SBI(sb)->flag = flag; 481 482 return 0; 483 } 484 485 static int jfs_fill_super(struct super_block *sb, void *data, int silent) 486 { 487 struct jfs_sb_info *sbi; 488 struct inode *inode; 489 int rc; 490 s64 newLVSize = 0; 491 int flag, ret = -EINVAL; 492 493 jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags); 494 495 sbi = kzalloc(sizeof(struct jfs_sb_info), GFP_KERNEL); 496 if (!sbi) 497 return -ENOMEM; 498 499 sb->s_fs_info = sbi; 500 sb->s_max_links = JFS_LINK_MAX; 501 sb->s_time_min = 0; 502 sb->s_time_max = U32_MAX; 503 sbi->sb = sb; 504 sbi->uid = INVALID_UID; 505 sbi->gid = INVALID_GID; 506 sbi->umask = -1; 507 508 /* initialize the mount flag and determine the default error handler */ 509 flag = JFS_ERR_REMOUNT_RO; 510 511 if (!parse_options((char *) data, sb, &newLVSize, &flag)) 512 goto out_kfree; 513 sbi->flag = flag; 514 515 #ifdef CONFIG_JFS_POSIX_ACL 516 sb->s_flags |= SB_POSIXACL; 517 #endif 518 519 if (newLVSize) { 520 pr_err("resize option for remount only\n"); 521 goto out_kfree; 522 } 523 524 /* 525 * Initialize blocksize to 4K. 526 */ 527 sb_set_blocksize(sb, PSIZE); 528 529 /* 530 * Set method vectors. 531 */ 532 sb->s_op = &jfs_super_operations; 533 sb->s_export_op = &jfs_export_operations; 534 sb->s_xattr = jfs_xattr_handlers; 535 #ifdef CONFIG_QUOTA 536 sb->dq_op = &dquot_operations; 537 sb->s_qcop = &jfs_quotactl_ops; 538 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; 539 #endif 540 541 /* 542 * Initialize direct-mapping inode/address-space 543 */ 544 inode = new_inode(sb); 545 if (inode == NULL) { 546 ret = -ENOMEM; 547 goto out_unload; 548 } 549 inode->i_size = bdev_nr_bytes(sb->s_bdev); 550 inode->i_mapping->a_ops = &jfs_metapage_aops; 551 inode_fake_hash(inode); 552 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS); 553 554 sbi->direct_inode = inode; 555 556 rc = jfs_mount(sb); 557 if (rc) { 558 if (!silent) 559 jfs_err("jfs_mount failed w/return code = %d", rc); 560 goto out_mount_failed; 561 } 562 if (sb_rdonly(sb)) 563 sbi->log = NULL; 564 else { 565 rc = jfs_mount_rw(sb, 0); 566 if (rc) { 567 if (!silent) { 568 jfs_err("jfs_mount_rw failed, return code = %d", 569 rc); 570 } 571 goto out_no_rw; 572 } 573 } 574 575 sb->s_magic = JFS_SUPER_MAGIC; 576 577 if (sbi->mntflag & JFS_OS2) 578 sb->s_d_op = &jfs_ci_dentry_operations; 579 580 inode = jfs_iget(sb, ROOT_I); 581 if (IS_ERR(inode)) { 582 ret = PTR_ERR(inode); 583 goto out_no_rw; 584 } 585 sb->s_root = d_make_root(inode); 586 if (!sb->s_root) 587 goto out_no_root; 588 589 /* logical blocks are represented by 40 bits in pxd_t, etc. 590 * and page cache is indexed by long 591 */ 592 sb->s_maxbytes = min(((loff_t)sb->s_blocksize) << 40, MAX_LFS_FILESIZE); 593 sb->s_time_gran = 1; 594 return 0; 595 596 out_no_root: 597 jfs_err("jfs_read_super: get root dentry failed"); 598 599 out_no_rw: 600 rc = jfs_umount(sb); 601 if (rc) 602 jfs_err("jfs_umount failed with return code %d", rc); 603 out_mount_failed: 604 filemap_write_and_wait(sbi->direct_inode->i_mapping); 605 truncate_inode_pages(sbi->direct_inode->i_mapping, 0); 606 make_bad_inode(sbi->direct_inode); 607 iput(sbi->direct_inode); 608 sbi->direct_inode = NULL; 609 out_unload: 610 unload_nls(sbi->nls_tab); 611 out_kfree: 612 kfree(sbi); 613 return ret; 614 } 615 616 static int jfs_freeze(struct super_block *sb) 617 { 618 struct jfs_sb_info *sbi = JFS_SBI(sb); 619 struct jfs_log *log = sbi->log; 620 int rc = 0; 621 622 if (!sb_rdonly(sb)) { 623 txQuiesce(sb); 624 rc = lmLogShutdown(log); 625 if (rc) { 626 jfs_error(sb, "lmLogShutdown failed\n"); 627 628 /* let operations fail rather than hang */ 629 txResume(sb); 630 631 return rc; 632 } 633 rc = updateSuper(sb, FM_CLEAN); 634 if (rc) { 635 jfs_err("jfs_freeze: updateSuper failed"); 636 /* 637 * Don't fail here. Everything succeeded except 638 * marking the superblock clean, so there's really 639 * no harm in leaving it frozen for now. 640 */ 641 } 642 } 643 return 0; 644 } 645 646 static int jfs_unfreeze(struct super_block *sb) 647 { 648 struct jfs_sb_info *sbi = JFS_SBI(sb); 649 struct jfs_log *log = sbi->log; 650 int rc = 0; 651 652 if (!sb_rdonly(sb)) { 653 rc = updateSuper(sb, FM_MOUNT); 654 if (rc) { 655 jfs_error(sb, "updateSuper failed\n"); 656 goto out; 657 } 658 rc = lmLogInit(log); 659 if (rc) 660 jfs_error(sb, "lmLogInit failed\n"); 661 out: 662 txResume(sb); 663 } 664 return rc; 665 } 666 667 static struct dentry *jfs_do_mount(struct file_system_type *fs_type, 668 int flags, const char *dev_name, void *data) 669 { 670 return mount_bdev(fs_type, flags, dev_name, data, jfs_fill_super); 671 } 672 673 static int jfs_sync_fs(struct super_block *sb, int wait) 674 { 675 struct jfs_log *log = JFS_SBI(sb)->log; 676 677 /* log == NULL indicates read-only mount */ 678 if (log) { 679 /* 680 * Write quota structures to quota file, sync_blockdev() will 681 * write them to disk later 682 */ 683 dquot_writeback_dquots(sb, -1); 684 jfs_flush_journal(log, wait); 685 jfs_syncpt(log, 0); 686 } 687 688 return 0; 689 } 690 691 static int jfs_show_options(struct seq_file *seq, struct dentry *root) 692 { 693 struct jfs_sb_info *sbi = JFS_SBI(root->d_sb); 694 695 if (uid_valid(sbi->uid)) 696 seq_printf(seq, ",uid=%d", from_kuid(&init_user_ns, sbi->uid)); 697 if (gid_valid(sbi->gid)) 698 seq_printf(seq, ",gid=%d", from_kgid(&init_user_ns, sbi->gid)); 699 if (sbi->umask != -1) 700 seq_printf(seq, ",umask=%03o", sbi->umask); 701 if (sbi->flag & JFS_NOINTEGRITY) 702 seq_puts(seq, ",nointegrity"); 703 if (sbi->flag & JFS_DISCARD) 704 seq_printf(seq, ",discard=%u", sbi->minblks_trim); 705 if (sbi->nls_tab) 706 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset); 707 if (sbi->flag & JFS_ERR_CONTINUE) 708 seq_printf(seq, ",errors=continue"); 709 if (sbi->flag & JFS_ERR_PANIC) 710 seq_printf(seq, ",errors=panic"); 711 712 #ifdef CONFIG_QUOTA 713 if (sbi->flag & JFS_USRQUOTA) 714 seq_puts(seq, ",usrquota"); 715 716 if (sbi->flag & JFS_GRPQUOTA) 717 seq_puts(seq, ",grpquota"); 718 #endif 719 720 return 0; 721 } 722 723 #ifdef CONFIG_QUOTA 724 725 /* Read data from quotafile - avoid pagecache and such because we cannot afford 726 * acquiring the locks... As quota files are never truncated and quota code 727 * itself serializes the operations (and no one else should touch the files) 728 * we don't have to be afraid of races */ 729 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data, 730 size_t len, loff_t off) 731 { 732 struct inode *inode = sb_dqopt(sb)->files[type]; 733 sector_t blk = off >> sb->s_blocksize_bits; 734 int err = 0; 735 int offset = off & (sb->s_blocksize - 1); 736 int tocopy; 737 size_t toread; 738 struct buffer_head tmp_bh; 739 struct buffer_head *bh; 740 loff_t i_size = i_size_read(inode); 741 742 if (off > i_size) 743 return 0; 744 if (off+len > i_size) 745 len = i_size-off; 746 toread = len; 747 while (toread > 0) { 748 tocopy = min_t(size_t, sb->s_blocksize - offset, toread); 749 750 tmp_bh.b_state = 0; 751 tmp_bh.b_size = i_blocksize(inode); 752 err = jfs_get_block(inode, blk, &tmp_bh, 0); 753 if (err) 754 return err; 755 if (!buffer_mapped(&tmp_bh)) /* A hole? */ 756 memset(data, 0, tocopy); 757 else { 758 bh = sb_bread(sb, tmp_bh.b_blocknr); 759 if (!bh) 760 return -EIO; 761 memcpy(data, bh->b_data+offset, tocopy); 762 brelse(bh); 763 } 764 offset = 0; 765 toread -= tocopy; 766 data += tocopy; 767 blk++; 768 } 769 return len; 770 } 771 772 /* Write to quotafile */ 773 static ssize_t jfs_quota_write(struct super_block *sb, int type, 774 const char *data, size_t len, loff_t off) 775 { 776 struct inode *inode = sb_dqopt(sb)->files[type]; 777 sector_t blk = off >> sb->s_blocksize_bits; 778 int err = 0; 779 int offset = off & (sb->s_blocksize - 1); 780 int tocopy; 781 size_t towrite = len; 782 struct buffer_head tmp_bh; 783 struct buffer_head *bh; 784 785 inode_lock(inode); 786 while (towrite > 0) { 787 tocopy = min_t(size_t, sb->s_blocksize - offset, towrite); 788 789 tmp_bh.b_state = 0; 790 tmp_bh.b_size = i_blocksize(inode); 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 inode_unlock(inode); 817 return err; 818 } 819 if (inode->i_size < off+len-towrite) 820 i_size_write(inode, off+len-towrite); 821 inode->i_mtime = inode_set_ctime_current(inode); 822 mark_inode_dirty(inode); 823 inode_unlock(inode); 824 return len - towrite; 825 } 826 827 static struct dquot __rcu **jfs_get_dquots(struct inode *inode) 828 { 829 return JFS_IP(inode)->i_dquot; 830 } 831 832 static int jfs_quota_on(struct super_block *sb, int type, int format_id, 833 const struct path *path) 834 { 835 int err; 836 struct inode *inode; 837 838 err = dquot_quota_on(sb, type, format_id, path); 839 if (err) 840 return err; 841 842 inode = d_inode(path->dentry); 843 inode_lock(inode); 844 JFS_IP(inode)->mode2 |= JFS_NOATIME_FL | JFS_IMMUTABLE_FL; 845 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE, 846 S_NOATIME | S_IMMUTABLE); 847 inode_unlock(inode); 848 mark_inode_dirty(inode); 849 850 return 0; 851 } 852 853 static int jfs_quota_off(struct super_block *sb, int type) 854 { 855 struct inode *inode = sb_dqopt(sb)->files[type]; 856 int err; 857 858 if (!inode || !igrab(inode)) 859 goto out; 860 861 err = dquot_quota_off(sb, type); 862 if (err) 863 goto out_put; 864 865 inode_lock(inode); 866 JFS_IP(inode)->mode2 &= ~(JFS_NOATIME_FL | JFS_IMMUTABLE_FL); 867 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE); 868 inode_unlock(inode); 869 mark_inode_dirty(inode); 870 out_put: 871 iput(inode); 872 return err; 873 out: 874 return dquot_quota_off(sb, type); 875 } 876 #endif 877 878 static const struct super_operations jfs_super_operations = { 879 .alloc_inode = jfs_alloc_inode, 880 .free_inode = jfs_free_inode, 881 .dirty_inode = jfs_dirty_inode, 882 .write_inode = jfs_write_inode, 883 .evict_inode = jfs_evict_inode, 884 .put_super = jfs_put_super, 885 .sync_fs = jfs_sync_fs, 886 .freeze_fs = jfs_freeze, 887 .unfreeze_fs = jfs_unfreeze, 888 .statfs = jfs_statfs, 889 .remount_fs = jfs_remount, 890 .show_options = jfs_show_options, 891 #ifdef CONFIG_QUOTA 892 .quota_read = jfs_quota_read, 893 .quota_write = jfs_quota_write, 894 .get_dquots = jfs_get_dquots, 895 #endif 896 }; 897 898 static const struct export_operations jfs_export_operations = { 899 .fh_to_dentry = jfs_fh_to_dentry, 900 .fh_to_parent = jfs_fh_to_parent, 901 .get_parent = jfs_get_parent, 902 }; 903 904 static struct file_system_type jfs_fs_type = { 905 .owner = THIS_MODULE, 906 .name = "jfs", 907 .mount = jfs_do_mount, 908 .kill_sb = kill_block_super, 909 .fs_flags = FS_REQUIRES_DEV, 910 }; 911 MODULE_ALIAS_FS("jfs"); 912 913 static void init_once(void *foo) 914 { 915 struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo; 916 917 memset(jfs_ip, 0, sizeof(struct jfs_inode_info)); 918 INIT_LIST_HEAD(&jfs_ip->anon_inode_list); 919 init_rwsem(&jfs_ip->rdwrlock); 920 mutex_init(&jfs_ip->commit_mutex); 921 init_rwsem(&jfs_ip->xattr_sem); 922 spin_lock_init(&jfs_ip->ag_lock); 923 jfs_ip->active_ag = -1; 924 inode_init_once(&jfs_ip->vfs_inode); 925 } 926 927 static int __init init_jfs_fs(void) 928 { 929 int i; 930 int rc; 931 932 jfs_inode_cachep = 933 kmem_cache_create_usercopy("jfs_ip", sizeof(struct jfs_inode_info), 934 0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|SLAB_ACCOUNT, 935 offsetof(struct jfs_inode_info, i_inline_all), 936 sizeof_field(struct jfs_inode_info, i_inline_all), 937 init_once); 938 if (jfs_inode_cachep == NULL) 939 return -ENOMEM; 940 941 /* 942 * Metapage initialization 943 */ 944 rc = metapage_init(); 945 if (rc) { 946 jfs_err("metapage_init failed w/rc = %d", rc); 947 goto free_slab; 948 } 949 950 /* 951 * Transaction Manager initialization 952 */ 953 rc = txInit(); 954 if (rc) { 955 jfs_err("txInit failed w/rc = %d", rc); 956 goto free_metapage; 957 } 958 959 /* 960 * I/O completion thread (endio) 961 */ 962 jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO"); 963 if (IS_ERR(jfsIOthread)) { 964 rc = PTR_ERR(jfsIOthread); 965 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 966 goto end_txmngr; 967 } 968 969 if (commit_threads < 1) 970 commit_threads = num_online_cpus(); 971 if (commit_threads > MAX_COMMIT_THREADS) 972 commit_threads = MAX_COMMIT_THREADS; 973 974 for (i = 0; i < commit_threads; i++) { 975 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, 976 "jfsCommit"); 977 if (IS_ERR(jfsCommitThread[i])) { 978 rc = PTR_ERR(jfsCommitThread[i]); 979 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 980 commit_threads = i; 981 goto kill_committask; 982 } 983 } 984 985 jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync"); 986 if (IS_ERR(jfsSyncThread)) { 987 rc = PTR_ERR(jfsSyncThread); 988 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 989 goto kill_committask; 990 } 991 992 #ifdef PROC_FS_JFS 993 jfs_proc_init(); 994 #endif 995 996 rc = register_filesystem(&jfs_fs_type); 997 if (!rc) 998 return 0; 999 1000 #ifdef PROC_FS_JFS 1001 jfs_proc_clean(); 1002 #endif 1003 kthread_stop(jfsSyncThread); 1004 kill_committask: 1005 for (i = 0; i < commit_threads; i++) 1006 kthread_stop(jfsCommitThread[i]); 1007 kthread_stop(jfsIOthread); 1008 end_txmngr: 1009 txExit(); 1010 free_metapage: 1011 metapage_exit(); 1012 free_slab: 1013 kmem_cache_destroy(jfs_inode_cachep); 1014 return rc; 1015 } 1016 1017 static void __exit exit_jfs_fs(void) 1018 { 1019 int i; 1020 1021 jfs_info("exit_jfs_fs called"); 1022 1023 txExit(); 1024 metapage_exit(); 1025 1026 kthread_stop(jfsIOthread); 1027 for (i = 0; i < commit_threads; i++) 1028 kthread_stop(jfsCommitThread[i]); 1029 kthread_stop(jfsSyncThread); 1030 #ifdef PROC_FS_JFS 1031 jfs_proc_clean(); 1032 #endif 1033 unregister_filesystem(&jfs_fs_type); 1034 1035 /* 1036 * Make sure all delayed rcu free inodes are flushed before we 1037 * destroy cache. 1038 */ 1039 rcu_barrier(); 1040 kmem_cache_destroy(jfs_inode_cachep); 1041 } 1042 1043 module_init(init_jfs_fs) 1044 module_exit(exit_jfs_fs) 1045