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 <linux/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 #include "jfs_dinode.h" 49 50 MODULE_DESCRIPTION("The Journaled Filesystem (JFS)"); 51 MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM"); 52 MODULE_LICENSE("GPL"); 53 54 static struct kmem_cache *jfs_inode_cachep; 55 56 static const struct super_operations jfs_super_operations; 57 static const struct export_operations jfs_export_operations; 58 static struct file_system_type jfs_fs_type; 59 60 #define MAX_COMMIT_THREADS 64 61 static int commit_threads; 62 module_param(commit_threads, int, 0); 63 MODULE_PARM_DESC(commit_threads, "Number of commit threads"); 64 65 static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS]; 66 struct task_struct *jfsIOthread; 67 struct task_struct *jfsSyncThread; 68 69 #ifdef CONFIG_JFS_DEBUG 70 int jfsloglevel = JFS_LOGLEVEL_WARN; 71 module_param(jfsloglevel, int, 0644); 72 MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)"); 73 #endif 74 75 static void jfs_handle_error(struct super_block *sb) 76 { 77 struct jfs_sb_info *sbi = JFS_SBI(sb); 78 79 if (sb->s_flags & MS_RDONLY) 80 return; 81 82 updateSuper(sb, FM_DIRTY); 83 84 if (sbi->flag & JFS_ERR_PANIC) 85 panic("JFS (device %s): panic forced after error\n", 86 sb->s_id); 87 else if (sbi->flag & JFS_ERR_REMOUNT_RO) { 88 jfs_err("ERROR: (device %s): remounting filesystem as read-only", 89 sb->s_id); 90 sb->s_flags |= MS_RDONLY; 91 } 92 93 /* nothing is done for continue beyond marking the superblock dirty */ 94 } 95 96 void jfs_error(struct super_block *sb, const char *fmt, ...) 97 { 98 struct va_format vaf; 99 va_list args; 100 101 va_start(args, fmt); 102 103 vaf.fmt = fmt; 104 vaf.va = &args; 105 106 pr_err("ERROR: (device %s): %ps: %pV\n", 107 sb->s_id, __builtin_return_address(0), &vaf); 108 109 va_end(args); 110 111 jfs_handle_error(sb); 112 } 113 114 static struct inode *jfs_alloc_inode(struct super_block *sb) 115 { 116 struct jfs_inode_info *jfs_inode; 117 118 jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS); 119 if (!jfs_inode) 120 return NULL; 121 #ifdef CONFIG_QUOTA 122 memset(&jfs_inode->i_dquot, 0, sizeof(jfs_inode->i_dquot)); 123 #endif 124 return &jfs_inode->vfs_inode; 125 } 126 127 static void jfs_i_callback(struct rcu_head *head) 128 { 129 struct inode *inode = container_of(head, struct inode, i_rcu); 130 struct jfs_inode_info *ji = JFS_IP(inode); 131 kmem_cache_free(jfs_inode_cachep, ji); 132 } 133 134 static void jfs_destroy_inode(struct inode *inode) 135 { 136 struct jfs_inode_info *ji = JFS_IP(inode); 137 138 BUG_ON(!list_empty(&ji->anon_inode_list)); 139 140 spin_lock_irq(&ji->ag_lock); 141 if (ji->active_ag != -1) { 142 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap; 143 atomic_dec(&bmap->db_active[ji->active_ag]); 144 ji->active_ag = -1; 145 } 146 spin_unlock_irq(&ji->ag_lock); 147 call_rcu(&inode->i_rcu, jfs_i_callback); 148 } 149 150 static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf) 151 { 152 struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb); 153 s64 maxinodes; 154 struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap; 155 156 jfs_info("In jfs_statfs"); 157 buf->f_type = JFS_SUPER_MAGIC; 158 buf->f_bsize = sbi->bsize; 159 buf->f_blocks = sbi->bmap->db_mapsize; 160 buf->f_bfree = sbi->bmap->db_nfree; 161 buf->f_bavail = sbi->bmap->db_nfree; 162 /* 163 * If we really return the number of allocated & free inodes, some 164 * applications will fail because they won't see enough free inodes. 165 * We'll try to calculate some guess as to how many inodes we can 166 * really allocate 167 * 168 * buf->f_files = atomic_read(&imap->im_numinos); 169 * buf->f_ffree = atomic_read(&imap->im_numfree); 170 */ 171 maxinodes = min((s64) atomic_read(&imap->im_numinos) + 172 ((sbi->bmap->db_nfree >> imap->im_l2nbperiext) 173 << L2INOSPEREXT), (s64) 0xffffffffLL); 174 buf->f_files = maxinodes; 175 buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) - 176 atomic_read(&imap->im_numfree)); 177 buf->f_fsid.val[0] = (u32)crc32_le(0, sbi->uuid, sizeof(sbi->uuid)/2); 178 buf->f_fsid.val[1] = (u32)crc32_le(0, sbi->uuid + sizeof(sbi->uuid)/2, 179 sizeof(sbi->uuid)/2); 180 181 buf->f_namelen = JFS_NAME_MAX; 182 return 0; 183 } 184 185 #ifdef CONFIG_QUOTA 186 static int jfs_quota_off(struct super_block *sb, int type); 187 static int jfs_quota_on(struct super_block *sb, int type, int format_id, 188 const struct path *path); 189 190 static void jfs_quota_off_umount(struct super_block *sb) 191 { 192 int type; 193 194 for (type = 0; type < MAXQUOTAS; type++) 195 jfs_quota_off(sb, type); 196 } 197 198 static const struct quotactl_ops jfs_quotactl_ops = { 199 .quota_on = jfs_quota_on, 200 .quota_off = jfs_quota_off, 201 .quota_sync = dquot_quota_sync, 202 .get_state = dquot_get_state, 203 .set_info = dquot_set_dqinfo, 204 .get_dqblk = dquot_get_dqblk, 205 .set_dqblk = dquot_set_dqblk, 206 .get_nextdqblk = dquot_get_next_dqblk, 207 }; 208 #else 209 static inline void jfs_quota_off_umount(struct super_block *sb) 210 { 211 } 212 #endif 213 214 static void jfs_put_super(struct super_block *sb) 215 { 216 struct jfs_sb_info *sbi = JFS_SBI(sb); 217 int rc; 218 219 jfs_info("In jfs_put_super"); 220 221 jfs_quota_off_umount(sb); 222 223 rc = jfs_umount(sb); 224 if (rc) 225 jfs_err("jfs_umount failed with return code %d", rc); 226 227 unload_nls(sbi->nls_tab); 228 229 truncate_inode_pages(sbi->direct_inode->i_mapping, 0); 230 iput(sbi->direct_inode); 231 232 kfree(sbi); 233 } 234 235 enum { 236 Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize, 237 Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota, 238 Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask, 239 Opt_discard, Opt_nodiscard, Opt_discard_minblk 240 }; 241 242 static const match_table_t tokens = { 243 {Opt_integrity, "integrity"}, 244 {Opt_nointegrity, "nointegrity"}, 245 {Opt_iocharset, "iocharset=%s"}, 246 {Opt_resize, "resize=%u"}, 247 {Opt_resize_nosize, "resize"}, 248 {Opt_errors, "errors=%s"}, 249 {Opt_ignore, "noquota"}, 250 {Opt_ignore, "quota"}, 251 {Opt_usrquota, "usrquota"}, 252 {Opt_grpquota, "grpquota"}, 253 {Opt_uid, "uid=%u"}, 254 {Opt_gid, "gid=%u"}, 255 {Opt_umask, "umask=%u"}, 256 {Opt_discard, "discard"}, 257 {Opt_nodiscard, "nodiscard"}, 258 {Opt_discard_minblk, "discard=%u"}, 259 {Opt_err, NULL} 260 }; 261 262 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize, 263 int *flag) 264 { 265 void *nls_map = (void *)-1; /* -1: no change; NULL: none */ 266 char *p; 267 struct jfs_sb_info *sbi = JFS_SBI(sb); 268 269 *newLVSize = 0; 270 271 if (!options) 272 return 1; 273 274 while ((p = strsep(&options, ",")) != NULL) { 275 substring_t args[MAX_OPT_ARGS]; 276 int token; 277 if (!*p) 278 continue; 279 280 token = match_token(p, tokens, args); 281 switch (token) { 282 case Opt_integrity: 283 *flag &= ~JFS_NOINTEGRITY; 284 break; 285 case Opt_nointegrity: 286 *flag |= JFS_NOINTEGRITY; 287 break; 288 case Opt_ignore: 289 /* Silently ignore the quota options */ 290 /* Don't do anything ;-) */ 291 break; 292 case Opt_iocharset: 293 if (nls_map && nls_map != (void *) -1) 294 unload_nls(nls_map); 295 if (!strcmp(args[0].from, "none")) 296 nls_map = NULL; 297 else { 298 nls_map = load_nls(args[0].from); 299 if (!nls_map) { 300 pr_err("JFS: charset not found\n"); 301 goto cleanup; 302 } 303 } 304 break; 305 case Opt_resize: 306 { 307 char *resize = args[0].from; 308 int rc = kstrtoll(resize, 0, newLVSize); 309 310 if (rc) 311 goto cleanup; 312 break; 313 } 314 case Opt_resize_nosize: 315 { 316 *newLVSize = sb->s_bdev->bd_inode->i_size >> 317 sb->s_blocksize_bits; 318 if (*newLVSize == 0) 319 pr_err("JFS: Cannot determine volume size\n"); 320 break; 321 } 322 case Opt_errors: 323 { 324 char *errors = args[0].from; 325 if (!errors || !*errors) 326 goto cleanup; 327 if (!strcmp(errors, "continue")) { 328 *flag &= ~JFS_ERR_REMOUNT_RO; 329 *flag &= ~JFS_ERR_PANIC; 330 *flag |= JFS_ERR_CONTINUE; 331 } else if (!strcmp(errors, "remount-ro")) { 332 *flag &= ~JFS_ERR_CONTINUE; 333 *flag &= ~JFS_ERR_PANIC; 334 *flag |= JFS_ERR_REMOUNT_RO; 335 } else if (!strcmp(errors, "panic")) { 336 *flag &= ~JFS_ERR_CONTINUE; 337 *flag &= ~JFS_ERR_REMOUNT_RO; 338 *flag |= JFS_ERR_PANIC; 339 } else { 340 pr_err("JFS: %s is an invalid error handler\n", 341 errors); 342 goto cleanup; 343 } 344 break; 345 } 346 347 #ifdef CONFIG_QUOTA 348 case Opt_quota: 349 case Opt_usrquota: 350 *flag |= JFS_USRQUOTA; 351 break; 352 case Opt_grpquota: 353 *flag |= JFS_GRPQUOTA; 354 break; 355 #else 356 case Opt_usrquota: 357 case Opt_grpquota: 358 case Opt_quota: 359 pr_err("JFS: quota operations not supported\n"); 360 break; 361 #endif 362 case Opt_uid: 363 { 364 char *uid = args[0].from; 365 uid_t val; 366 int rc = kstrtouint(uid, 0, &val); 367 368 if (rc) 369 goto cleanup; 370 sbi->uid = make_kuid(current_user_ns(), val); 371 if (!uid_valid(sbi->uid)) 372 goto cleanup; 373 break; 374 } 375 376 case Opt_gid: 377 { 378 char *gid = args[0].from; 379 gid_t val; 380 int rc = kstrtouint(gid, 0, &val); 381 382 if (rc) 383 goto cleanup; 384 sbi->gid = make_kgid(current_user_ns(), val); 385 if (!gid_valid(sbi->gid)) 386 goto cleanup; 387 break; 388 } 389 390 case Opt_umask: 391 { 392 char *umask = args[0].from; 393 int rc = kstrtouint(umask, 8, &sbi->umask); 394 395 if (rc) 396 goto cleanup; 397 if (sbi->umask & ~0777) { 398 pr_err("JFS: Invalid value of umask\n"); 399 goto cleanup; 400 } 401 break; 402 } 403 404 case Opt_discard: 405 { 406 struct request_queue *q = bdev_get_queue(sb->s_bdev); 407 /* if set to 1, even copying files will cause 408 * trimming :O 409 * -> user has more control over the online trimming 410 */ 411 sbi->minblks_trim = 64; 412 if (blk_queue_discard(q)) 413 *flag |= JFS_DISCARD; 414 else 415 pr_err("JFS: discard option not supported on device\n"); 416 break; 417 } 418 419 case Opt_nodiscard: 420 *flag &= ~JFS_DISCARD; 421 break; 422 423 case Opt_discard_minblk: 424 { 425 struct request_queue *q = bdev_get_queue(sb->s_bdev); 426 char *minblks_trim = args[0].from; 427 int rc; 428 if (blk_queue_discard(q)) { 429 *flag |= JFS_DISCARD; 430 rc = kstrtouint(minblks_trim, 0, 431 &sbi->minblks_trim); 432 if (rc) 433 goto cleanup; 434 } else 435 pr_err("JFS: discard option not supported on device\n"); 436 break; 437 } 438 439 default: 440 printk("jfs: Unrecognized mount option \"%s\" or missing value\n", 441 p); 442 goto cleanup; 443 } 444 } 445 446 if (nls_map != (void *) -1) { 447 /* Discard old (if remount) */ 448 unload_nls(sbi->nls_tab); 449 sbi->nls_tab = nls_map; 450 } 451 return 1; 452 453 cleanup: 454 if (nls_map && nls_map != (void *) -1) 455 unload_nls(nls_map); 456 return 0; 457 } 458 459 static int jfs_remount(struct super_block *sb, int *flags, char *data) 460 { 461 s64 newLVSize = 0; 462 int rc = 0; 463 int flag = JFS_SBI(sb)->flag; 464 int ret; 465 466 sync_filesystem(sb); 467 if (!parse_options(data, sb, &newLVSize, &flag)) 468 return -EINVAL; 469 470 if (newLVSize) { 471 if (sb->s_flags & MS_RDONLY) { 472 pr_err("JFS: resize requires volume to be mounted read-write\n"); 473 return -EROFS; 474 } 475 rc = jfs_extendfs(sb, newLVSize, 0); 476 if (rc) 477 return rc; 478 } 479 480 if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) { 481 /* 482 * Invalidate any previously read metadata. fsck may have 483 * changed the on-disk data since we mounted r/o 484 */ 485 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0); 486 487 JFS_SBI(sb)->flag = flag; 488 ret = jfs_mount_rw(sb, 1); 489 490 /* mark the fs r/w for quota activity */ 491 sb->s_flags &= ~MS_RDONLY; 492 493 dquot_resume(sb, -1); 494 return ret; 495 } 496 if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) { 497 rc = dquot_suspend(sb, -1); 498 if (rc < 0) 499 return rc; 500 rc = jfs_umount_rw(sb); 501 JFS_SBI(sb)->flag = flag; 502 return rc; 503 } 504 if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY)) 505 if (!(sb->s_flags & MS_RDONLY)) { 506 rc = jfs_umount_rw(sb); 507 if (rc) 508 return rc; 509 510 JFS_SBI(sb)->flag = flag; 511 ret = jfs_mount_rw(sb, 1); 512 return ret; 513 } 514 JFS_SBI(sb)->flag = flag; 515 516 return 0; 517 } 518 519 static int jfs_fill_super(struct super_block *sb, void *data, int silent) 520 { 521 struct jfs_sb_info *sbi; 522 struct inode *inode; 523 int rc; 524 s64 newLVSize = 0; 525 int flag, ret = -EINVAL; 526 527 jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags); 528 529 sbi = kzalloc(sizeof(struct jfs_sb_info), GFP_KERNEL); 530 if (!sbi) 531 return -ENOMEM; 532 533 sb->s_fs_info = sbi; 534 sb->s_max_links = JFS_LINK_MAX; 535 sbi->sb = sb; 536 sbi->uid = INVALID_UID; 537 sbi->gid = INVALID_GID; 538 sbi->umask = -1; 539 540 /* initialize the mount flag and determine the default error handler */ 541 flag = JFS_ERR_REMOUNT_RO; 542 543 if (!parse_options((char *) data, sb, &newLVSize, &flag)) 544 goto out_kfree; 545 sbi->flag = flag; 546 547 #ifdef CONFIG_JFS_POSIX_ACL 548 sb->s_flags |= MS_POSIXACL; 549 #endif 550 551 if (newLVSize) { 552 pr_err("resize option for remount only\n"); 553 goto out_kfree; 554 } 555 556 /* 557 * Initialize blocksize to 4K. 558 */ 559 sb_set_blocksize(sb, PSIZE); 560 561 /* 562 * Set method vectors. 563 */ 564 sb->s_op = &jfs_super_operations; 565 sb->s_export_op = &jfs_export_operations; 566 sb->s_xattr = jfs_xattr_handlers; 567 #ifdef CONFIG_QUOTA 568 sb->dq_op = &dquot_operations; 569 sb->s_qcop = &jfs_quotactl_ops; 570 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; 571 #endif 572 573 /* 574 * Initialize direct-mapping inode/address-space 575 */ 576 inode = new_inode(sb); 577 if (inode == NULL) { 578 ret = -ENOMEM; 579 goto out_unload; 580 } 581 inode->i_ino = 0; 582 inode->i_size = sb->s_bdev->bd_inode->i_size; 583 inode->i_mapping->a_ops = &jfs_metapage_aops; 584 hlist_add_fake(&inode->i_hash); 585 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS); 586 587 sbi->direct_inode = inode; 588 589 rc = jfs_mount(sb); 590 if (rc) { 591 if (!silent) 592 jfs_err("jfs_mount failed w/return code = %d", rc); 593 goto out_mount_failed; 594 } 595 if (sb->s_flags & MS_RDONLY) 596 sbi->log = NULL; 597 else { 598 rc = jfs_mount_rw(sb, 0); 599 if (rc) { 600 if (!silent) { 601 jfs_err("jfs_mount_rw failed, return code = %d", 602 rc); 603 } 604 goto out_no_rw; 605 } 606 } 607 608 sb->s_magic = JFS_SUPER_MAGIC; 609 610 if (sbi->mntflag & JFS_OS2) 611 sb->s_d_op = &jfs_ci_dentry_operations; 612 613 inode = jfs_iget(sb, ROOT_I); 614 if (IS_ERR(inode)) { 615 ret = PTR_ERR(inode); 616 goto out_no_rw; 617 } 618 sb->s_root = d_make_root(inode); 619 if (!sb->s_root) 620 goto out_no_root; 621 622 /* logical blocks are represented by 40 bits in pxd_t, etc. */ 623 sb->s_maxbytes = ((u64) sb->s_blocksize) << 40; 624 #if BITS_PER_LONG == 32 625 /* 626 * Page cache is indexed by long. 627 * I would use MAX_LFS_FILESIZE, but it's only half as big 628 */ 629 sb->s_maxbytes = min(((u64) PAGE_SIZE << 32) - 1, 630 (u64)sb->s_maxbytes); 631 #endif 632 sb->s_time_gran = 1; 633 return 0; 634 635 out_no_root: 636 jfs_err("jfs_read_super: get root dentry failed"); 637 638 out_no_rw: 639 rc = jfs_umount(sb); 640 if (rc) 641 jfs_err("jfs_umount failed with return code %d", rc); 642 out_mount_failed: 643 filemap_write_and_wait(sbi->direct_inode->i_mapping); 644 truncate_inode_pages(sbi->direct_inode->i_mapping, 0); 645 make_bad_inode(sbi->direct_inode); 646 iput(sbi->direct_inode); 647 sbi->direct_inode = NULL; 648 out_unload: 649 unload_nls(sbi->nls_tab); 650 out_kfree: 651 kfree(sbi); 652 return ret; 653 } 654 655 static int jfs_freeze(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 txQuiesce(sb); 663 rc = lmLogShutdown(log); 664 if (rc) { 665 jfs_error(sb, "lmLogShutdown failed\n"); 666 667 /* let operations fail rather than hang */ 668 txResume(sb); 669 670 return rc; 671 } 672 rc = updateSuper(sb, FM_CLEAN); 673 if (rc) { 674 jfs_err("jfs_freeze: updateSuper failed"); 675 /* 676 * Don't fail here. Everything succeeded except 677 * marking the superblock clean, so there's really 678 * no harm in leaving it frozen for now. 679 */ 680 } 681 } 682 return 0; 683 } 684 685 static int jfs_unfreeze(struct super_block *sb) 686 { 687 struct jfs_sb_info *sbi = JFS_SBI(sb); 688 struct jfs_log *log = sbi->log; 689 int rc = 0; 690 691 if (!(sb->s_flags & MS_RDONLY)) { 692 rc = updateSuper(sb, FM_MOUNT); 693 if (rc) { 694 jfs_error(sb, "updateSuper failed\n"); 695 goto out; 696 } 697 rc = lmLogInit(log); 698 if (rc) 699 jfs_error(sb, "lmLogInit failed\n"); 700 out: 701 txResume(sb); 702 } 703 return rc; 704 } 705 706 static struct dentry *jfs_do_mount(struct file_system_type *fs_type, 707 int flags, const char *dev_name, void *data) 708 { 709 return mount_bdev(fs_type, flags, dev_name, data, jfs_fill_super); 710 } 711 712 static int jfs_sync_fs(struct super_block *sb, int wait) 713 { 714 struct jfs_log *log = JFS_SBI(sb)->log; 715 716 /* log == NULL indicates read-only mount */ 717 if (log) { 718 /* 719 * Write quota structures to quota file, sync_blockdev() will 720 * write them to disk later 721 */ 722 dquot_writeback_dquots(sb, -1); 723 jfs_flush_journal(log, wait); 724 jfs_syncpt(log, 0); 725 } 726 727 return 0; 728 } 729 730 static int jfs_show_options(struct seq_file *seq, struct dentry *root) 731 { 732 struct jfs_sb_info *sbi = JFS_SBI(root->d_sb); 733 734 if (uid_valid(sbi->uid)) 735 seq_printf(seq, ",uid=%d", from_kuid(&init_user_ns, sbi->uid)); 736 if (gid_valid(sbi->gid)) 737 seq_printf(seq, ",gid=%d", from_kgid(&init_user_ns, sbi->gid)); 738 if (sbi->umask != -1) 739 seq_printf(seq, ",umask=%03o", sbi->umask); 740 if (sbi->flag & JFS_NOINTEGRITY) 741 seq_puts(seq, ",nointegrity"); 742 if (sbi->flag & JFS_DISCARD) 743 seq_printf(seq, ",discard=%u", sbi->minblks_trim); 744 if (sbi->nls_tab) 745 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset); 746 if (sbi->flag & JFS_ERR_CONTINUE) 747 seq_printf(seq, ",errors=continue"); 748 if (sbi->flag & JFS_ERR_PANIC) 749 seq_printf(seq, ",errors=panic"); 750 751 #ifdef CONFIG_QUOTA 752 if (sbi->flag & JFS_USRQUOTA) 753 seq_puts(seq, ",usrquota"); 754 755 if (sbi->flag & JFS_GRPQUOTA) 756 seq_puts(seq, ",grpquota"); 757 #endif 758 759 return 0; 760 } 761 762 #ifdef CONFIG_QUOTA 763 764 /* Read data from quotafile - avoid pagecache and such because we cannot afford 765 * acquiring the locks... As quota files are never truncated and quota code 766 * itself serializes the operations (and no one else should touch the files) 767 * we don't have to be afraid of races */ 768 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data, 769 size_t len, loff_t off) 770 { 771 struct inode *inode = sb_dqopt(sb)->files[type]; 772 sector_t blk = off >> sb->s_blocksize_bits; 773 int err = 0; 774 int offset = off & (sb->s_blocksize - 1); 775 int tocopy; 776 size_t toread; 777 struct buffer_head tmp_bh; 778 struct buffer_head *bh; 779 loff_t i_size = i_size_read(inode); 780 781 if (off > i_size) 782 return 0; 783 if (off+len > i_size) 784 len = i_size-off; 785 toread = len; 786 while (toread > 0) { 787 tocopy = sb->s_blocksize - offset < toread ? 788 sb->s_blocksize - offset : toread; 789 790 tmp_bh.b_state = 0; 791 tmp_bh.b_size = i_blocksize(inode); 792 err = jfs_get_block(inode, blk, &tmp_bh, 0); 793 if (err) 794 return err; 795 if (!buffer_mapped(&tmp_bh)) /* A hole? */ 796 memset(data, 0, tocopy); 797 else { 798 bh = sb_bread(sb, tmp_bh.b_blocknr); 799 if (!bh) 800 return -EIO; 801 memcpy(data, bh->b_data+offset, tocopy); 802 brelse(bh); 803 } 804 offset = 0; 805 toread -= tocopy; 806 data += tocopy; 807 blk++; 808 } 809 return len; 810 } 811 812 /* Write to quotafile */ 813 static ssize_t jfs_quota_write(struct super_block *sb, int type, 814 const char *data, size_t len, loff_t off) 815 { 816 struct inode *inode = sb_dqopt(sb)->files[type]; 817 sector_t blk = off >> sb->s_blocksize_bits; 818 int err = 0; 819 int offset = off & (sb->s_blocksize - 1); 820 int tocopy; 821 size_t towrite = len; 822 struct buffer_head tmp_bh; 823 struct buffer_head *bh; 824 825 inode_lock(inode); 826 while (towrite > 0) { 827 tocopy = sb->s_blocksize - offset < towrite ? 828 sb->s_blocksize - offset : towrite; 829 830 tmp_bh.b_state = 0; 831 tmp_bh.b_size = i_blocksize(inode); 832 err = jfs_get_block(inode, blk, &tmp_bh, 1); 833 if (err) 834 goto out; 835 if (offset || tocopy != sb->s_blocksize) 836 bh = sb_bread(sb, tmp_bh.b_blocknr); 837 else 838 bh = sb_getblk(sb, tmp_bh.b_blocknr); 839 if (!bh) { 840 err = -EIO; 841 goto out; 842 } 843 lock_buffer(bh); 844 memcpy(bh->b_data+offset, data, tocopy); 845 flush_dcache_page(bh->b_page); 846 set_buffer_uptodate(bh); 847 mark_buffer_dirty(bh); 848 unlock_buffer(bh); 849 brelse(bh); 850 offset = 0; 851 towrite -= tocopy; 852 data += tocopy; 853 blk++; 854 } 855 out: 856 if (len == towrite) { 857 inode_unlock(inode); 858 return err; 859 } 860 if (inode->i_size < off+len-towrite) 861 i_size_write(inode, off+len-towrite); 862 inode->i_version++; 863 inode->i_mtime = inode->i_ctime = current_time(inode); 864 mark_inode_dirty(inode); 865 inode_unlock(inode); 866 return len - towrite; 867 } 868 869 static struct dquot **jfs_get_dquots(struct inode *inode) 870 { 871 return JFS_IP(inode)->i_dquot; 872 } 873 874 static int jfs_quota_on(struct super_block *sb, int type, int format_id, 875 const struct path *path) 876 { 877 int err; 878 struct inode *inode; 879 880 err = dquot_quota_on(sb, type, format_id, path); 881 if (err) 882 return err; 883 884 inode = d_inode(path->dentry); 885 inode_lock(inode); 886 JFS_IP(inode)->mode2 |= JFS_NOATIME_FL | JFS_IMMUTABLE_FL; 887 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE, 888 S_NOATIME | S_IMMUTABLE); 889 inode_unlock(inode); 890 mark_inode_dirty(inode); 891 892 return 0; 893 } 894 895 static int jfs_quota_off(struct super_block *sb, int type) 896 { 897 struct inode *inode = sb_dqopt(sb)->files[type]; 898 int err; 899 900 if (!inode || !igrab(inode)) 901 goto out; 902 903 err = dquot_quota_off(sb, type); 904 if (err) 905 goto out_put; 906 907 inode_lock(inode); 908 JFS_IP(inode)->mode2 &= ~(JFS_NOATIME_FL | JFS_IMMUTABLE_FL); 909 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE); 910 inode_unlock(inode); 911 mark_inode_dirty(inode); 912 out_put: 913 iput(inode); 914 return err; 915 out: 916 return dquot_quota_off(sb, type); 917 } 918 #endif 919 920 static const struct super_operations jfs_super_operations = { 921 .alloc_inode = jfs_alloc_inode, 922 .destroy_inode = jfs_destroy_inode, 923 .dirty_inode = jfs_dirty_inode, 924 .write_inode = jfs_write_inode, 925 .evict_inode = jfs_evict_inode, 926 .put_super = jfs_put_super, 927 .sync_fs = jfs_sync_fs, 928 .freeze_fs = jfs_freeze, 929 .unfreeze_fs = jfs_unfreeze, 930 .statfs = jfs_statfs, 931 .remount_fs = jfs_remount, 932 .show_options = jfs_show_options, 933 #ifdef CONFIG_QUOTA 934 .quota_read = jfs_quota_read, 935 .quota_write = jfs_quota_write, 936 .get_dquots = jfs_get_dquots, 937 #endif 938 }; 939 940 static const struct export_operations jfs_export_operations = { 941 .fh_to_dentry = jfs_fh_to_dentry, 942 .fh_to_parent = jfs_fh_to_parent, 943 .get_parent = jfs_get_parent, 944 }; 945 946 static struct file_system_type jfs_fs_type = { 947 .owner = THIS_MODULE, 948 .name = "jfs", 949 .mount = jfs_do_mount, 950 .kill_sb = kill_block_super, 951 .fs_flags = FS_REQUIRES_DEV, 952 }; 953 MODULE_ALIAS_FS("jfs"); 954 955 static void init_once(void *foo) 956 { 957 struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo; 958 959 memset(jfs_ip, 0, sizeof(struct jfs_inode_info)); 960 INIT_LIST_HEAD(&jfs_ip->anon_inode_list); 961 init_rwsem(&jfs_ip->rdwrlock); 962 mutex_init(&jfs_ip->commit_mutex); 963 init_rwsem(&jfs_ip->xattr_sem); 964 spin_lock_init(&jfs_ip->ag_lock); 965 jfs_ip->active_ag = -1; 966 inode_init_once(&jfs_ip->vfs_inode); 967 } 968 969 static int __init init_jfs_fs(void) 970 { 971 int i; 972 int rc; 973 974 jfs_inode_cachep = 975 kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0, 976 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|SLAB_ACCOUNT, 977 init_once); 978 if (jfs_inode_cachep == NULL) 979 return -ENOMEM; 980 981 /* 982 * Metapage initialization 983 */ 984 rc = metapage_init(); 985 if (rc) { 986 jfs_err("metapage_init failed w/rc = %d", rc); 987 goto free_slab; 988 } 989 990 /* 991 * Transaction Manager initialization 992 */ 993 rc = txInit(); 994 if (rc) { 995 jfs_err("txInit failed w/rc = %d", rc); 996 goto free_metapage; 997 } 998 999 /* 1000 * I/O completion thread (endio) 1001 */ 1002 jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO"); 1003 if (IS_ERR(jfsIOthread)) { 1004 rc = PTR_ERR(jfsIOthread); 1005 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 1006 goto end_txmngr; 1007 } 1008 1009 if (commit_threads < 1) 1010 commit_threads = num_online_cpus(); 1011 if (commit_threads > MAX_COMMIT_THREADS) 1012 commit_threads = MAX_COMMIT_THREADS; 1013 1014 for (i = 0; i < commit_threads; i++) { 1015 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, 1016 "jfsCommit"); 1017 if (IS_ERR(jfsCommitThread[i])) { 1018 rc = PTR_ERR(jfsCommitThread[i]); 1019 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 1020 commit_threads = i; 1021 goto kill_committask; 1022 } 1023 } 1024 1025 jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync"); 1026 if (IS_ERR(jfsSyncThread)) { 1027 rc = PTR_ERR(jfsSyncThread); 1028 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 1029 goto kill_committask; 1030 } 1031 1032 #ifdef PROC_FS_JFS 1033 jfs_proc_init(); 1034 #endif 1035 1036 rc = register_filesystem(&jfs_fs_type); 1037 if (!rc) 1038 return 0; 1039 1040 #ifdef PROC_FS_JFS 1041 jfs_proc_clean(); 1042 #endif 1043 kthread_stop(jfsSyncThread); 1044 kill_committask: 1045 for (i = 0; i < commit_threads; i++) 1046 kthread_stop(jfsCommitThread[i]); 1047 kthread_stop(jfsIOthread); 1048 end_txmngr: 1049 txExit(); 1050 free_metapage: 1051 metapage_exit(); 1052 free_slab: 1053 kmem_cache_destroy(jfs_inode_cachep); 1054 return rc; 1055 } 1056 1057 static void __exit exit_jfs_fs(void) 1058 { 1059 int i; 1060 1061 jfs_info("exit_jfs_fs called"); 1062 1063 txExit(); 1064 metapage_exit(); 1065 1066 kthread_stop(jfsIOthread); 1067 for (i = 0; i < commit_threads; i++) 1068 kthread_stop(jfsCommitThread[i]); 1069 kthread_stop(jfsSyncThread); 1070 #ifdef PROC_FS_JFS 1071 jfs_proc_clean(); 1072 #endif 1073 unregister_filesystem(&jfs_fs_type); 1074 1075 /* 1076 * Make sure all delayed rcu free inodes are flushed before we 1077 * destroy cache. 1078 */ 1079 rcu_barrier(); 1080 kmem_cache_destroy(jfs_inode_cachep); 1081 } 1082 1083 module_init(init_jfs_fs) 1084 module_exit(exit_jfs_fs) 1085