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_rdonly(sb)) 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 |= SB_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 = i_size_read(sb->s_bdev->bd_inode) >> 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_rdonly(sb)) { 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_rdonly(sb) && !(*flags & SB_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 &= ~SB_RDONLY; 492 493 dquot_resume(sb, -1); 494 return ret; 495 } 496 if (!sb_rdonly(sb) && (*flags & SB_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_rdonly(sb)) { 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 |= SB_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 = i_size_read(sb->s_bdev->bd_inode); 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_rdonly(sb)) 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 * and page cache is indexed by long 624 */ 625 sb->s_maxbytes = min(((loff_t)sb->s_blocksize) << 40, MAX_LFS_FILESIZE); 626 sb->s_time_gran = 1; 627 return 0; 628 629 out_no_root: 630 jfs_err("jfs_read_super: get root dentry failed"); 631 632 out_no_rw: 633 rc = jfs_umount(sb); 634 if (rc) 635 jfs_err("jfs_umount failed with return code %d", rc); 636 out_mount_failed: 637 filemap_write_and_wait(sbi->direct_inode->i_mapping); 638 truncate_inode_pages(sbi->direct_inode->i_mapping, 0); 639 make_bad_inode(sbi->direct_inode); 640 iput(sbi->direct_inode); 641 sbi->direct_inode = NULL; 642 out_unload: 643 unload_nls(sbi->nls_tab); 644 out_kfree: 645 kfree(sbi); 646 return ret; 647 } 648 649 static int jfs_freeze(struct super_block *sb) 650 { 651 struct jfs_sb_info *sbi = JFS_SBI(sb); 652 struct jfs_log *log = sbi->log; 653 int rc = 0; 654 655 if (!sb_rdonly(sb)) { 656 txQuiesce(sb); 657 rc = lmLogShutdown(log); 658 if (rc) { 659 jfs_error(sb, "lmLogShutdown failed\n"); 660 661 /* let operations fail rather than hang */ 662 txResume(sb); 663 664 return rc; 665 } 666 rc = updateSuper(sb, FM_CLEAN); 667 if (rc) { 668 jfs_err("jfs_freeze: updateSuper failed"); 669 /* 670 * Don't fail here. Everything succeeded except 671 * marking the superblock clean, so there's really 672 * no harm in leaving it frozen for now. 673 */ 674 } 675 } 676 return 0; 677 } 678 679 static int jfs_unfreeze(struct super_block *sb) 680 { 681 struct jfs_sb_info *sbi = JFS_SBI(sb); 682 struct jfs_log *log = sbi->log; 683 int rc = 0; 684 685 if (!sb_rdonly(sb)) { 686 rc = updateSuper(sb, FM_MOUNT); 687 if (rc) { 688 jfs_error(sb, "updateSuper failed\n"); 689 goto out; 690 } 691 rc = lmLogInit(log); 692 if (rc) 693 jfs_error(sb, "lmLogInit failed\n"); 694 out: 695 txResume(sb); 696 } 697 return rc; 698 } 699 700 static struct dentry *jfs_do_mount(struct file_system_type *fs_type, 701 int flags, const char *dev_name, void *data) 702 { 703 return mount_bdev(fs_type, flags, dev_name, data, jfs_fill_super); 704 } 705 706 static int jfs_sync_fs(struct super_block *sb, int wait) 707 { 708 struct jfs_log *log = JFS_SBI(sb)->log; 709 710 /* log == NULL indicates read-only mount */ 711 if (log) { 712 /* 713 * Write quota structures to quota file, sync_blockdev() will 714 * write them to disk later 715 */ 716 dquot_writeback_dquots(sb, -1); 717 jfs_flush_journal(log, wait); 718 jfs_syncpt(log, 0); 719 } 720 721 return 0; 722 } 723 724 static int jfs_show_options(struct seq_file *seq, struct dentry *root) 725 { 726 struct jfs_sb_info *sbi = JFS_SBI(root->d_sb); 727 728 if (uid_valid(sbi->uid)) 729 seq_printf(seq, ",uid=%d", from_kuid(&init_user_ns, sbi->uid)); 730 if (gid_valid(sbi->gid)) 731 seq_printf(seq, ",gid=%d", from_kgid(&init_user_ns, sbi->gid)); 732 if (sbi->umask != -1) 733 seq_printf(seq, ",umask=%03o", sbi->umask); 734 if (sbi->flag & JFS_NOINTEGRITY) 735 seq_puts(seq, ",nointegrity"); 736 if (sbi->flag & JFS_DISCARD) 737 seq_printf(seq, ",discard=%u", sbi->minblks_trim); 738 if (sbi->nls_tab) 739 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset); 740 if (sbi->flag & JFS_ERR_CONTINUE) 741 seq_printf(seq, ",errors=continue"); 742 if (sbi->flag & JFS_ERR_PANIC) 743 seq_printf(seq, ",errors=panic"); 744 745 #ifdef CONFIG_QUOTA 746 if (sbi->flag & JFS_USRQUOTA) 747 seq_puts(seq, ",usrquota"); 748 749 if (sbi->flag & JFS_GRPQUOTA) 750 seq_puts(seq, ",grpquota"); 751 #endif 752 753 return 0; 754 } 755 756 #ifdef CONFIG_QUOTA 757 758 /* Read data from quotafile - avoid pagecache and such because we cannot afford 759 * acquiring the locks... As quota files are never truncated and quota code 760 * itself serializes the operations (and no one else should touch the files) 761 * we don't have to be afraid of races */ 762 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data, 763 size_t len, loff_t off) 764 { 765 struct inode *inode = sb_dqopt(sb)->files[type]; 766 sector_t blk = off >> sb->s_blocksize_bits; 767 int err = 0; 768 int offset = off & (sb->s_blocksize - 1); 769 int tocopy; 770 size_t toread; 771 struct buffer_head tmp_bh; 772 struct buffer_head *bh; 773 loff_t i_size = i_size_read(inode); 774 775 if (off > i_size) 776 return 0; 777 if (off+len > i_size) 778 len = i_size-off; 779 toread = len; 780 while (toread > 0) { 781 tocopy = sb->s_blocksize - offset < toread ? 782 sb->s_blocksize - offset : toread; 783 784 tmp_bh.b_state = 0; 785 tmp_bh.b_size = i_blocksize(inode); 786 err = jfs_get_block(inode, blk, &tmp_bh, 0); 787 if (err) 788 return err; 789 if (!buffer_mapped(&tmp_bh)) /* A hole? */ 790 memset(data, 0, tocopy); 791 else { 792 bh = sb_bread(sb, tmp_bh.b_blocknr); 793 if (!bh) 794 return -EIO; 795 memcpy(data, bh->b_data+offset, tocopy); 796 brelse(bh); 797 } 798 offset = 0; 799 toread -= tocopy; 800 data += tocopy; 801 blk++; 802 } 803 return len; 804 } 805 806 /* Write to quotafile */ 807 static ssize_t jfs_quota_write(struct super_block *sb, int type, 808 const char *data, size_t len, loff_t off) 809 { 810 struct inode *inode = sb_dqopt(sb)->files[type]; 811 sector_t blk = off >> sb->s_blocksize_bits; 812 int err = 0; 813 int offset = off & (sb->s_blocksize - 1); 814 int tocopy; 815 size_t towrite = len; 816 struct buffer_head tmp_bh; 817 struct buffer_head *bh; 818 819 inode_lock(inode); 820 while (towrite > 0) { 821 tocopy = sb->s_blocksize - offset < towrite ? 822 sb->s_blocksize - offset : towrite; 823 824 tmp_bh.b_state = 0; 825 tmp_bh.b_size = i_blocksize(inode); 826 err = jfs_get_block(inode, blk, &tmp_bh, 1); 827 if (err) 828 goto out; 829 if (offset || tocopy != sb->s_blocksize) 830 bh = sb_bread(sb, tmp_bh.b_blocknr); 831 else 832 bh = sb_getblk(sb, tmp_bh.b_blocknr); 833 if (!bh) { 834 err = -EIO; 835 goto out; 836 } 837 lock_buffer(bh); 838 memcpy(bh->b_data+offset, data, tocopy); 839 flush_dcache_page(bh->b_page); 840 set_buffer_uptodate(bh); 841 mark_buffer_dirty(bh); 842 unlock_buffer(bh); 843 brelse(bh); 844 offset = 0; 845 towrite -= tocopy; 846 data += tocopy; 847 blk++; 848 } 849 out: 850 if (len == towrite) { 851 inode_unlock(inode); 852 return err; 853 } 854 if (inode->i_size < off+len-towrite) 855 i_size_write(inode, off+len-towrite); 856 inode->i_mtime = inode->i_ctime = current_time(inode); 857 mark_inode_dirty(inode); 858 inode_unlock(inode); 859 return len - towrite; 860 } 861 862 static struct dquot **jfs_get_dquots(struct inode *inode) 863 { 864 return JFS_IP(inode)->i_dquot; 865 } 866 867 static int jfs_quota_on(struct super_block *sb, int type, int format_id, 868 const struct path *path) 869 { 870 int err; 871 struct inode *inode; 872 873 err = dquot_quota_on(sb, type, format_id, path); 874 if (err) 875 return err; 876 877 inode = d_inode(path->dentry); 878 inode_lock(inode); 879 JFS_IP(inode)->mode2 |= JFS_NOATIME_FL | JFS_IMMUTABLE_FL; 880 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE, 881 S_NOATIME | S_IMMUTABLE); 882 inode_unlock(inode); 883 mark_inode_dirty(inode); 884 885 return 0; 886 } 887 888 static int jfs_quota_off(struct super_block *sb, int type) 889 { 890 struct inode *inode = sb_dqopt(sb)->files[type]; 891 int err; 892 893 if (!inode || !igrab(inode)) 894 goto out; 895 896 err = dquot_quota_off(sb, type); 897 if (err) 898 goto out_put; 899 900 inode_lock(inode); 901 JFS_IP(inode)->mode2 &= ~(JFS_NOATIME_FL | JFS_IMMUTABLE_FL); 902 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE); 903 inode_unlock(inode); 904 mark_inode_dirty(inode); 905 out_put: 906 iput(inode); 907 return err; 908 out: 909 return dquot_quota_off(sb, type); 910 } 911 #endif 912 913 static const struct super_operations jfs_super_operations = { 914 .alloc_inode = jfs_alloc_inode, 915 .destroy_inode = jfs_destroy_inode, 916 .dirty_inode = jfs_dirty_inode, 917 .write_inode = jfs_write_inode, 918 .evict_inode = jfs_evict_inode, 919 .put_super = jfs_put_super, 920 .sync_fs = jfs_sync_fs, 921 .freeze_fs = jfs_freeze, 922 .unfreeze_fs = jfs_unfreeze, 923 .statfs = jfs_statfs, 924 .remount_fs = jfs_remount, 925 .show_options = jfs_show_options, 926 #ifdef CONFIG_QUOTA 927 .quota_read = jfs_quota_read, 928 .quota_write = jfs_quota_write, 929 .get_dquots = jfs_get_dquots, 930 #endif 931 }; 932 933 static const struct export_operations jfs_export_operations = { 934 .fh_to_dentry = jfs_fh_to_dentry, 935 .fh_to_parent = jfs_fh_to_parent, 936 .get_parent = jfs_get_parent, 937 }; 938 939 static struct file_system_type jfs_fs_type = { 940 .owner = THIS_MODULE, 941 .name = "jfs", 942 .mount = jfs_do_mount, 943 .kill_sb = kill_block_super, 944 .fs_flags = FS_REQUIRES_DEV, 945 }; 946 MODULE_ALIAS_FS("jfs"); 947 948 static void init_once(void *foo) 949 { 950 struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo; 951 952 memset(jfs_ip, 0, sizeof(struct jfs_inode_info)); 953 INIT_LIST_HEAD(&jfs_ip->anon_inode_list); 954 init_rwsem(&jfs_ip->rdwrlock); 955 mutex_init(&jfs_ip->commit_mutex); 956 init_rwsem(&jfs_ip->xattr_sem); 957 spin_lock_init(&jfs_ip->ag_lock); 958 jfs_ip->active_ag = -1; 959 inode_init_once(&jfs_ip->vfs_inode); 960 } 961 962 static int __init init_jfs_fs(void) 963 { 964 int i; 965 int rc; 966 967 jfs_inode_cachep = 968 kmem_cache_create_usercopy("jfs_ip", sizeof(struct jfs_inode_info), 969 0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|SLAB_ACCOUNT, 970 offsetof(struct jfs_inode_info, i_inline), 971 sizeof_field(struct jfs_inode_info, i_inline), 972 init_once); 973 if (jfs_inode_cachep == NULL) 974 return -ENOMEM; 975 976 /* 977 * Metapage initialization 978 */ 979 rc = metapage_init(); 980 if (rc) { 981 jfs_err("metapage_init failed w/rc = %d", rc); 982 goto free_slab; 983 } 984 985 /* 986 * Transaction Manager initialization 987 */ 988 rc = txInit(); 989 if (rc) { 990 jfs_err("txInit failed w/rc = %d", rc); 991 goto free_metapage; 992 } 993 994 /* 995 * I/O completion thread (endio) 996 */ 997 jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO"); 998 if (IS_ERR(jfsIOthread)) { 999 rc = PTR_ERR(jfsIOthread); 1000 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 1001 goto end_txmngr; 1002 } 1003 1004 if (commit_threads < 1) 1005 commit_threads = num_online_cpus(); 1006 if (commit_threads > MAX_COMMIT_THREADS) 1007 commit_threads = MAX_COMMIT_THREADS; 1008 1009 for (i = 0; i < commit_threads; i++) { 1010 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, 1011 "jfsCommit"); 1012 if (IS_ERR(jfsCommitThread[i])) { 1013 rc = PTR_ERR(jfsCommitThread[i]); 1014 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 1015 commit_threads = i; 1016 goto kill_committask; 1017 } 1018 } 1019 1020 jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync"); 1021 if (IS_ERR(jfsSyncThread)) { 1022 rc = PTR_ERR(jfsSyncThread); 1023 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 1024 goto kill_committask; 1025 } 1026 1027 #ifdef PROC_FS_JFS 1028 jfs_proc_init(); 1029 #endif 1030 1031 rc = register_filesystem(&jfs_fs_type); 1032 if (!rc) 1033 return 0; 1034 1035 #ifdef PROC_FS_JFS 1036 jfs_proc_clean(); 1037 #endif 1038 kthread_stop(jfsSyncThread); 1039 kill_committask: 1040 for (i = 0; i < commit_threads; i++) 1041 kthread_stop(jfsCommitThread[i]); 1042 kthread_stop(jfsIOthread); 1043 end_txmngr: 1044 txExit(); 1045 free_metapage: 1046 metapage_exit(); 1047 free_slab: 1048 kmem_cache_destroy(jfs_inode_cachep); 1049 return rc; 1050 } 1051 1052 static void __exit exit_jfs_fs(void) 1053 { 1054 int i; 1055 1056 jfs_info("exit_jfs_fs called"); 1057 1058 txExit(); 1059 metapage_exit(); 1060 1061 kthread_stop(jfsIOthread); 1062 for (i = 0; i < commit_threads; i++) 1063 kthread_stop(jfsCommitThread[i]); 1064 kthread_stop(jfsSyncThread); 1065 #ifdef PROC_FS_JFS 1066 jfs_proc_clean(); 1067 #endif 1068 unregister_filesystem(&jfs_fs_type); 1069 1070 /* 1071 * Make sure all delayed rcu free inodes are flushed before we 1072 * destroy cache. 1073 */ 1074 rcu_barrier(); 1075 kmem_cache_destroy(jfs_inode_cachep); 1076 } 1077 1078 module_init(init_jfs_fs) 1079 module_exit(exit_jfs_fs) 1080