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_free_inode(struct inode *inode) 128 { 129 kmem_cache_free(jfs_inode_cachep, JFS_IP(inode)); 130 } 131 132 static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf) 133 { 134 struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb); 135 s64 maxinodes; 136 struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap; 137 138 jfs_info("In jfs_statfs"); 139 buf->f_type = JFS_SUPER_MAGIC; 140 buf->f_bsize = sbi->bsize; 141 buf->f_blocks = sbi->bmap->db_mapsize; 142 buf->f_bfree = sbi->bmap->db_nfree; 143 buf->f_bavail = sbi->bmap->db_nfree; 144 /* 145 * If we really return the number of allocated & free inodes, some 146 * applications will fail because they won't see enough free inodes. 147 * We'll try to calculate some guess as to how many inodes we can 148 * really allocate 149 * 150 * buf->f_files = atomic_read(&imap->im_numinos); 151 * buf->f_ffree = atomic_read(&imap->im_numfree); 152 */ 153 maxinodes = min((s64) atomic_read(&imap->im_numinos) + 154 ((sbi->bmap->db_nfree >> imap->im_l2nbperiext) 155 << L2INOSPEREXT), (s64) 0xffffffffLL); 156 buf->f_files = maxinodes; 157 buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) - 158 atomic_read(&imap->im_numfree)); 159 buf->f_fsid.val[0] = crc32_le(0, (char *)&sbi->uuid, 160 sizeof(sbi->uuid)/2); 161 buf->f_fsid.val[1] = crc32_le(0, 162 (char *)&sbi->uuid + sizeof(sbi->uuid)/2, 163 sizeof(sbi->uuid)/2); 164 165 buf->f_namelen = JFS_NAME_MAX; 166 return 0; 167 } 168 169 #ifdef CONFIG_QUOTA 170 static int jfs_quota_off(struct super_block *sb, int type); 171 static int jfs_quota_on(struct super_block *sb, int type, int format_id, 172 const struct path *path); 173 174 static void jfs_quota_off_umount(struct super_block *sb) 175 { 176 int type; 177 178 for (type = 0; type < MAXQUOTAS; type++) 179 jfs_quota_off(sb, type); 180 } 181 182 static const struct quotactl_ops jfs_quotactl_ops = { 183 .quota_on = jfs_quota_on, 184 .quota_off = jfs_quota_off, 185 .quota_sync = dquot_quota_sync, 186 .get_state = dquot_get_state, 187 .set_info = dquot_set_dqinfo, 188 .get_dqblk = dquot_get_dqblk, 189 .set_dqblk = dquot_set_dqblk, 190 .get_nextdqblk = dquot_get_next_dqblk, 191 }; 192 #else 193 static inline void jfs_quota_off_umount(struct super_block *sb) 194 { 195 } 196 #endif 197 198 static void jfs_put_super(struct super_block *sb) 199 { 200 struct jfs_sb_info *sbi = JFS_SBI(sb); 201 int rc; 202 203 jfs_info("In jfs_put_super"); 204 205 jfs_quota_off_umount(sb); 206 207 rc = jfs_umount(sb); 208 if (rc) 209 jfs_err("jfs_umount failed with return code %d", rc); 210 211 unload_nls(sbi->nls_tab); 212 213 truncate_inode_pages(sbi->direct_inode->i_mapping, 0); 214 iput(sbi->direct_inode); 215 216 kfree(sbi); 217 } 218 219 enum { 220 Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize, 221 Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota, 222 Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask, 223 Opt_discard, Opt_nodiscard, Opt_discard_minblk 224 }; 225 226 static const match_table_t tokens = { 227 {Opt_integrity, "integrity"}, 228 {Opt_nointegrity, "nointegrity"}, 229 {Opt_iocharset, "iocharset=%s"}, 230 {Opt_resize, "resize=%u"}, 231 {Opt_resize_nosize, "resize"}, 232 {Opt_errors, "errors=%s"}, 233 {Opt_ignore, "noquota"}, 234 {Opt_quota, "quota"}, 235 {Opt_usrquota, "usrquota"}, 236 {Opt_grpquota, "grpquota"}, 237 {Opt_uid, "uid=%u"}, 238 {Opt_gid, "gid=%u"}, 239 {Opt_umask, "umask=%u"}, 240 {Opt_discard, "discard"}, 241 {Opt_nodiscard, "nodiscard"}, 242 {Opt_discard_minblk, "discard=%u"}, 243 {Opt_err, NULL} 244 }; 245 246 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize, 247 int *flag) 248 { 249 void *nls_map = (void *)-1; /* -1: no change; NULL: none */ 250 char *p; 251 struct jfs_sb_info *sbi = JFS_SBI(sb); 252 253 *newLVSize = 0; 254 255 if (!options) 256 return 1; 257 258 while ((p = strsep(&options, ",")) != NULL) { 259 substring_t args[MAX_OPT_ARGS]; 260 int token; 261 if (!*p) 262 continue; 263 264 token = match_token(p, tokens, args); 265 switch (token) { 266 case Opt_integrity: 267 *flag &= ~JFS_NOINTEGRITY; 268 break; 269 case Opt_nointegrity: 270 *flag |= JFS_NOINTEGRITY; 271 break; 272 case Opt_ignore: 273 /* Silently ignore the quota options */ 274 /* Don't do anything ;-) */ 275 break; 276 case Opt_iocharset: 277 if (nls_map && nls_map != (void *) -1) 278 unload_nls(nls_map); 279 if (!strcmp(args[0].from, "none")) 280 nls_map = NULL; 281 else { 282 nls_map = load_nls(args[0].from); 283 if (!nls_map) { 284 pr_err("JFS: charset not found\n"); 285 goto cleanup; 286 } 287 } 288 break; 289 case Opt_resize: 290 { 291 char *resize = args[0].from; 292 int rc = kstrtoll(resize, 0, newLVSize); 293 294 if (rc) 295 goto cleanup; 296 break; 297 } 298 case Opt_resize_nosize: 299 { 300 *newLVSize = i_size_read(sb->s_bdev->bd_inode) >> 301 sb->s_blocksize_bits; 302 if (*newLVSize == 0) 303 pr_err("JFS: Cannot determine volume size\n"); 304 break; 305 } 306 case Opt_errors: 307 { 308 char *errors = args[0].from; 309 if (!errors || !*errors) 310 goto cleanup; 311 if (!strcmp(errors, "continue")) { 312 *flag &= ~JFS_ERR_REMOUNT_RO; 313 *flag &= ~JFS_ERR_PANIC; 314 *flag |= JFS_ERR_CONTINUE; 315 } else if (!strcmp(errors, "remount-ro")) { 316 *flag &= ~JFS_ERR_CONTINUE; 317 *flag &= ~JFS_ERR_PANIC; 318 *flag |= JFS_ERR_REMOUNT_RO; 319 } else if (!strcmp(errors, "panic")) { 320 *flag &= ~JFS_ERR_CONTINUE; 321 *flag &= ~JFS_ERR_REMOUNT_RO; 322 *flag |= JFS_ERR_PANIC; 323 } else { 324 pr_err("JFS: %s is an invalid error handler\n", 325 errors); 326 goto cleanup; 327 } 328 break; 329 } 330 331 #ifdef CONFIG_QUOTA 332 case Opt_quota: 333 case Opt_usrquota: 334 *flag |= JFS_USRQUOTA; 335 break; 336 case Opt_grpquota: 337 *flag |= JFS_GRPQUOTA; 338 break; 339 #else 340 case Opt_usrquota: 341 case Opt_grpquota: 342 case Opt_quota: 343 pr_err("JFS: quota operations not supported\n"); 344 break; 345 #endif 346 case Opt_uid: 347 { 348 char *uid = args[0].from; 349 uid_t val; 350 int rc = kstrtouint(uid, 0, &val); 351 352 if (rc) 353 goto cleanup; 354 sbi->uid = make_kuid(current_user_ns(), val); 355 if (!uid_valid(sbi->uid)) 356 goto cleanup; 357 break; 358 } 359 360 case Opt_gid: 361 { 362 char *gid = args[0].from; 363 gid_t val; 364 int rc = kstrtouint(gid, 0, &val); 365 366 if (rc) 367 goto cleanup; 368 sbi->gid = make_kgid(current_user_ns(), val); 369 if (!gid_valid(sbi->gid)) 370 goto cleanup; 371 break; 372 } 373 374 case Opt_umask: 375 { 376 char *umask = args[0].from; 377 int rc = kstrtouint(umask, 8, &sbi->umask); 378 379 if (rc) 380 goto cleanup; 381 if (sbi->umask & ~0777) { 382 pr_err("JFS: Invalid value of umask\n"); 383 goto cleanup; 384 } 385 break; 386 } 387 388 case Opt_discard: 389 { 390 struct request_queue *q = bdev_get_queue(sb->s_bdev); 391 /* if set to 1, even copying files will cause 392 * trimming :O 393 * -> user has more control over the online trimming 394 */ 395 sbi->minblks_trim = 64; 396 if (blk_queue_discard(q)) 397 *flag |= JFS_DISCARD; 398 else 399 pr_err("JFS: discard option not supported on device\n"); 400 break; 401 } 402 403 case Opt_nodiscard: 404 *flag &= ~JFS_DISCARD; 405 break; 406 407 case Opt_discard_minblk: 408 { 409 struct request_queue *q = bdev_get_queue(sb->s_bdev); 410 char *minblks_trim = args[0].from; 411 int rc; 412 if (blk_queue_discard(q)) { 413 *flag |= JFS_DISCARD; 414 rc = kstrtouint(minblks_trim, 0, 415 &sbi->minblks_trim); 416 if (rc) 417 goto cleanup; 418 } else 419 pr_err("JFS: discard option not supported on device\n"); 420 break; 421 } 422 423 default: 424 printk("jfs: Unrecognized mount option \"%s\" or missing value\n", 425 p); 426 goto cleanup; 427 } 428 } 429 430 if (nls_map != (void *) -1) { 431 /* Discard old (if remount) */ 432 unload_nls(sbi->nls_tab); 433 sbi->nls_tab = nls_map; 434 } 435 return 1; 436 437 cleanup: 438 if (nls_map && nls_map != (void *) -1) 439 unload_nls(nls_map); 440 return 0; 441 } 442 443 static int jfs_remount(struct super_block *sb, int *flags, char *data) 444 { 445 s64 newLVSize = 0; 446 int rc = 0; 447 int flag = JFS_SBI(sb)->flag; 448 int ret; 449 450 sync_filesystem(sb); 451 if (!parse_options(data, sb, &newLVSize, &flag)) 452 return -EINVAL; 453 454 if (newLVSize) { 455 if (sb_rdonly(sb)) { 456 pr_err("JFS: resize requires volume to be mounted read-write\n"); 457 return -EROFS; 458 } 459 rc = jfs_extendfs(sb, newLVSize, 0); 460 if (rc) 461 return rc; 462 } 463 464 if (sb_rdonly(sb) && !(*flags & SB_RDONLY)) { 465 /* 466 * Invalidate any previously read metadata. fsck may have 467 * changed the on-disk data since we mounted r/o 468 */ 469 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0); 470 471 JFS_SBI(sb)->flag = flag; 472 ret = jfs_mount_rw(sb, 1); 473 474 /* mark the fs r/w for quota activity */ 475 sb->s_flags &= ~SB_RDONLY; 476 477 dquot_resume(sb, -1); 478 return ret; 479 } 480 if (!sb_rdonly(sb) && (*flags & SB_RDONLY)) { 481 rc = dquot_suspend(sb, -1); 482 if (rc < 0) 483 return rc; 484 rc = jfs_umount_rw(sb); 485 JFS_SBI(sb)->flag = flag; 486 return rc; 487 } 488 if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY)) 489 if (!sb_rdonly(sb)) { 490 rc = jfs_umount_rw(sb); 491 if (rc) 492 return rc; 493 494 JFS_SBI(sb)->flag = flag; 495 ret = jfs_mount_rw(sb, 1); 496 return ret; 497 } 498 JFS_SBI(sb)->flag = flag; 499 500 return 0; 501 } 502 503 static int jfs_fill_super(struct super_block *sb, void *data, int silent) 504 { 505 struct jfs_sb_info *sbi; 506 struct inode *inode; 507 int rc; 508 s64 newLVSize = 0; 509 int flag, ret = -EINVAL; 510 511 jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags); 512 513 sbi = kzalloc(sizeof(struct jfs_sb_info), GFP_KERNEL); 514 if (!sbi) 515 return -ENOMEM; 516 517 sb->s_fs_info = sbi; 518 sb->s_max_links = JFS_LINK_MAX; 519 sbi->sb = sb; 520 sbi->uid = INVALID_UID; 521 sbi->gid = INVALID_GID; 522 sbi->umask = -1; 523 524 /* initialize the mount flag and determine the default error handler */ 525 flag = JFS_ERR_REMOUNT_RO; 526 527 if (!parse_options((char *) data, sb, &newLVSize, &flag)) 528 goto out_kfree; 529 sbi->flag = flag; 530 531 #ifdef CONFIG_JFS_POSIX_ACL 532 sb->s_flags |= SB_POSIXACL; 533 #endif 534 535 if (newLVSize) { 536 pr_err("resize option for remount only\n"); 537 goto out_kfree; 538 } 539 540 /* 541 * Initialize blocksize to 4K. 542 */ 543 sb_set_blocksize(sb, PSIZE); 544 545 /* 546 * Set method vectors. 547 */ 548 sb->s_op = &jfs_super_operations; 549 sb->s_export_op = &jfs_export_operations; 550 sb->s_xattr = jfs_xattr_handlers; 551 #ifdef CONFIG_QUOTA 552 sb->dq_op = &dquot_operations; 553 sb->s_qcop = &jfs_quotactl_ops; 554 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; 555 #endif 556 557 /* 558 * Initialize direct-mapping inode/address-space 559 */ 560 inode = new_inode(sb); 561 if (inode == NULL) { 562 ret = -ENOMEM; 563 goto out_unload; 564 } 565 inode->i_ino = 0; 566 inode->i_size = i_size_read(sb->s_bdev->bd_inode); 567 inode->i_mapping->a_ops = &jfs_metapage_aops; 568 inode_fake_hash(inode); 569 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS); 570 571 sbi->direct_inode = inode; 572 573 rc = jfs_mount(sb); 574 if (rc) { 575 if (!silent) 576 jfs_err("jfs_mount failed w/return code = %d", rc); 577 goto out_mount_failed; 578 } 579 if (sb_rdonly(sb)) 580 sbi->log = NULL; 581 else { 582 rc = jfs_mount_rw(sb, 0); 583 if (rc) { 584 if (!silent) { 585 jfs_err("jfs_mount_rw failed, return code = %d", 586 rc); 587 } 588 goto out_no_rw; 589 } 590 } 591 592 sb->s_magic = JFS_SUPER_MAGIC; 593 594 if (sbi->mntflag & JFS_OS2) 595 sb->s_d_op = &jfs_ci_dentry_operations; 596 597 inode = jfs_iget(sb, ROOT_I); 598 if (IS_ERR(inode)) { 599 ret = PTR_ERR(inode); 600 goto out_no_rw; 601 } 602 sb->s_root = d_make_root(inode); 603 if (!sb->s_root) 604 goto out_no_root; 605 606 /* logical blocks are represented by 40 bits in pxd_t, etc. 607 * and page cache is indexed by long 608 */ 609 sb->s_maxbytes = min(((loff_t)sb->s_blocksize) << 40, MAX_LFS_FILESIZE); 610 sb->s_time_gran = 1; 611 return 0; 612 613 out_no_root: 614 jfs_err("jfs_read_super: get root dentry failed"); 615 616 out_no_rw: 617 rc = jfs_umount(sb); 618 if (rc) 619 jfs_err("jfs_umount failed with return code %d", rc); 620 out_mount_failed: 621 filemap_write_and_wait(sbi->direct_inode->i_mapping); 622 truncate_inode_pages(sbi->direct_inode->i_mapping, 0); 623 make_bad_inode(sbi->direct_inode); 624 iput(sbi->direct_inode); 625 sbi->direct_inode = NULL; 626 out_unload: 627 unload_nls(sbi->nls_tab); 628 out_kfree: 629 kfree(sbi); 630 return ret; 631 } 632 633 static int jfs_freeze(struct super_block *sb) 634 { 635 struct jfs_sb_info *sbi = JFS_SBI(sb); 636 struct jfs_log *log = sbi->log; 637 int rc = 0; 638 639 if (!sb_rdonly(sb)) { 640 txQuiesce(sb); 641 rc = lmLogShutdown(log); 642 if (rc) { 643 jfs_error(sb, "lmLogShutdown failed\n"); 644 645 /* let operations fail rather than hang */ 646 txResume(sb); 647 648 return rc; 649 } 650 rc = updateSuper(sb, FM_CLEAN); 651 if (rc) { 652 jfs_err("jfs_freeze: updateSuper failed"); 653 /* 654 * Don't fail here. Everything succeeded except 655 * marking the superblock clean, so there's really 656 * no harm in leaving it frozen for now. 657 */ 658 } 659 } 660 return 0; 661 } 662 663 static int jfs_unfreeze(struct super_block *sb) 664 { 665 struct jfs_sb_info *sbi = JFS_SBI(sb); 666 struct jfs_log *log = sbi->log; 667 int rc = 0; 668 669 if (!sb_rdonly(sb)) { 670 rc = updateSuper(sb, FM_MOUNT); 671 if (rc) { 672 jfs_error(sb, "updateSuper failed\n"); 673 goto out; 674 } 675 rc = lmLogInit(log); 676 if (rc) 677 jfs_error(sb, "lmLogInit failed\n"); 678 out: 679 txResume(sb); 680 } 681 return rc; 682 } 683 684 static struct dentry *jfs_do_mount(struct file_system_type *fs_type, 685 int flags, const char *dev_name, void *data) 686 { 687 return mount_bdev(fs_type, flags, dev_name, data, jfs_fill_super); 688 } 689 690 static int jfs_sync_fs(struct super_block *sb, int wait) 691 { 692 struct jfs_log *log = JFS_SBI(sb)->log; 693 694 /* log == NULL indicates read-only mount */ 695 if (log) { 696 /* 697 * Write quota structures to quota file, sync_blockdev() will 698 * write them to disk later 699 */ 700 dquot_writeback_dquots(sb, -1); 701 jfs_flush_journal(log, wait); 702 jfs_syncpt(log, 0); 703 } 704 705 return 0; 706 } 707 708 static int jfs_show_options(struct seq_file *seq, struct dentry *root) 709 { 710 struct jfs_sb_info *sbi = JFS_SBI(root->d_sb); 711 712 if (uid_valid(sbi->uid)) 713 seq_printf(seq, ",uid=%d", from_kuid(&init_user_ns, sbi->uid)); 714 if (gid_valid(sbi->gid)) 715 seq_printf(seq, ",gid=%d", from_kgid(&init_user_ns, sbi->gid)); 716 if (sbi->umask != -1) 717 seq_printf(seq, ",umask=%03o", sbi->umask); 718 if (sbi->flag & JFS_NOINTEGRITY) 719 seq_puts(seq, ",nointegrity"); 720 if (sbi->flag & JFS_DISCARD) 721 seq_printf(seq, ",discard=%u", sbi->minblks_trim); 722 if (sbi->nls_tab) 723 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset); 724 if (sbi->flag & JFS_ERR_CONTINUE) 725 seq_printf(seq, ",errors=continue"); 726 if (sbi->flag & JFS_ERR_PANIC) 727 seq_printf(seq, ",errors=panic"); 728 729 #ifdef CONFIG_QUOTA 730 if (sbi->flag & JFS_USRQUOTA) 731 seq_puts(seq, ",usrquota"); 732 733 if (sbi->flag & JFS_GRPQUOTA) 734 seq_puts(seq, ",grpquota"); 735 #endif 736 737 return 0; 738 } 739 740 #ifdef CONFIG_QUOTA 741 742 /* Read data from quotafile - avoid pagecache and such because we cannot afford 743 * acquiring the locks... As quota files are never truncated and quota code 744 * itself serializes the operations (and no one else should touch the files) 745 * we don't have to be afraid of races */ 746 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data, 747 size_t len, loff_t off) 748 { 749 struct inode *inode = sb_dqopt(sb)->files[type]; 750 sector_t blk = off >> sb->s_blocksize_bits; 751 int err = 0; 752 int offset = off & (sb->s_blocksize - 1); 753 int tocopy; 754 size_t toread; 755 struct buffer_head tmp_bh; 756 struct buffer_head *bh; 757 loff_t i_size = i_size_read(inode); 758 759 if (off > i_size) 760 return 0; 761 if (off+len > i_size) 762 len = i_size-off; 763 toread = len; 764 while (toread > 0) { 765 tocopy = sb->s_blocksize - offset < toread ? 766 sb->s_blocksize - offset : toread; 767 768 tmp_bh.b_state = 0; 769 tmp_bh.b_size = i_blocksize(inode); 770 err = jfs_get_block(inode, blk, &tmp_bh, 0); 771 if (err) 772 return err; 773 if (!buffer_mapped(&tmp_bh)) /* A hole? */ 774 memset(data, 0, tocopy); 775 else { 776 bh = sb_bread(sb, tmp_bh.b_blocknr); 777 if (!bh) 778 return -EIO; 779 memcpy(data, bh->b_data+offset, tocopy); 780 brelse(bh); 781 } 782 offset = 0; 783 toread -= tocopy; 784 data += tocopy; 785 blk++; 786 } 787 return len; 788 } 789 790 /* Write to quotafile */ 791 static ssize_t jfs_quota_write(struct super_block *sb, int type, 792 const char *data, size_t len, loff_t off) 793 { 794 struct inode *inode = sb_dqopt(sb)->files[type]; 795 sector_t blk = off >> sb->s_blocksize_bits; 796 int err = 0; 797 int offset = off & (sb->s_blocksize - 1); 798 int tocopy; 799 size_t towrite = len; 800 struct buffer_head tmp_bh; 801 struct buffer_head *bh; 802 803 inode_lock(inode); 804 while (towrite > 0) { 805 tocopy = sb->s_blocksize - offset < towrite ? 806 sb->s_blocksize - offset : towrite; 807 808 tmp_bh.b_state = 0; 809 tmp_bh.b_size = i_blocksize(inode); 810 err = jfs_get_block(inode, blk, &tmp_bh, 1); 811 if (err) 812 goto out; 813 if (offset || tocopy != sb->s_blocksize) 814 bh = sb_bread(sb, tmp_bh.b_blocknr); 815 else 816 bh = sb_getblk(sb, tmp_bh.b_blocknr); 817 if (!bh) { 818 err = -EIO; 819 goto out; 820 } 821 lock_buffer(bh); 822 memcpy(bh->b_data+offset, data, tocopy); 823 flush_dcache_page(bh->b_page); 824 set_buffer_uptodate(bh); 825 mark_buffer_dirty(bh); 826 unlock_buffer(bh); 827 brelse(bh); 828 offset = 0; 829 towrite -= tocopy; 830 data += tocopy; 831 blk++; 832 } 833 out: 834 if (len == towrite) { 835 inode_unlock(inode); 836 return err; 837 } 838 if (inode->i_size < off+len-towrite) 839 i_size_write(inode, off+len-towrite); 840 inode->i_mtime = inode->i_ctime = current_time(inode); 841 mark_inode_dirty(inode); 842 inode_unlock(inode); 843 return len - towrite; 844 } 845 846 static struct dquot **jfs_get_dquots(struct inode *inode) 847 { 848 return JFS_IP(inode)->i_dquot; 849 } 850 851 static int jfs_quota_on(struct super_block *sb, int type, int format_id, 852 const struct path *path) 853 { 854 int err; 855 struct inode *inode; 856 857 err = dquot_quota_on(sb, type, format_id, path); 858 if (err) 859 return err; 860 861 inode = d_inode(path->dentry); 862 inode_lock(inode); 863 JFS_IP(inode)->mode2 |= JFS_NOATIME_FL | JFS_IMMUTABLE_FL; 864 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE, 865 S_NOATIME | S_IMMUTABLE); 866 inode_unlock(inode); 867 mark_inode_dirty(inode); 868 869 return 0; 870 } 871 872 static int jfs_quota_off(struct super_block *sb, int type) 873 { 874 struct inode *inode = sb_dqopt(sb)->files[type]; 875 int err; 876 877 if (!inode || !igrab(inode)) 878 goto out; 879 880 err = dquot_quota_off(sb, type); 881 if (err) 882 goto out_put; 883 884 inode_lock(inode); 885 JFS_IP(inode)->mode2 &= ~(JFS_NOATIME_FL | JFS_IMMUTABLE_FL); 886 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE); 887 inode_unlock(inode); 888 mark_inode_dirty(inode); 889 out_put: 890 iput(inode); 891 return err; 892 out: 893 return dquot_quota_off(sb, type); 894 } 895 #endif 896 897 static const struct super_operations jfs_super_operations = { 898 .alloc_inode = jfs_alloc_inode, 899 .free_inode = jfs_free_inode, 900 .dirty_inode = jfs_dirty_inode, 901 .write_inode = jfs_write_inode, 902 .evict_inode = jfs_evict_inode, 903 .put_super = jfs_put_super, 904 .sync_fs = jfs_sync_fs, 905 .freeze_fs = jfs_freeze, 906 .unfreeze_fs = jfs_unfreeze, 907 .statfs = jfs_statfs, 908 .remount_fs = jfs_remount, 909 .show_options = jfs_show_options, 910 #ifdef CONFIG_QUOTA 911 .quota_read = jfs_quota_read, 912 .quota_write = jfs_quota_write, 913 .get_dquots = jfs_get_dquots, 914 #endif 915 }; 916 917 static const struct export_operations jfs_export_operations = { 918 .fh_to_dentry = jfs_fh_to_dentry, 919 .fh_to_parent = jfs_fh_to_parent, 920 .get_parent = jfs_get_parent, 921 }; 922 923 static struct file_system_type jfs_fs_type = { 924 .owner = THIS_MODULE, 925 .name = "jfs", 926 .mount = jfs_do_mount, 927 .kill_sb = kill_block_super, 928 .fs_flags = FS_REQUIRES_DEV, 929 }; 930 MODULE_ALIAS_FS("jfs"); 931 932 static void init_once(void *foo) 933 { 934 struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo; 935 936 memset(jfs_ip, 0, sizeof(struct jfs_inode_info)); 937 INIT_LIST_HEAD(&jfs_ip->anon_inode_list); 938 init_rwsem(&jfs_ip->rdwrlock); 939 mutex_init(&jfs_ip->commit_mutex); 940 init_rwsem(&jfs_ip->xattr_sem); 941 spin_lock_init(&jfs_ip->ag_lock); 942 jfs_ip->active_ag = -1; 943 inode_init_once(&jfs_ip->vfs_inode); 944 } 945 946 static int __init init_jfs_fs(void) 947 { 948 int i; 949 int rc; 950 951 jfs_inode_cachep = 952 kmem_cache_create_usercopy("jfs_ip", sizeof(struct jfs_inode_info), 953 0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|SLAB_ACCOUNT, 954 offsetof(struct jfs_inode_info, i_inline), IDATASIZE, 955 init_once); 956 if (jfs_inode_cachep == NULL) 957 return -ENOMEM; 958 959 /* 960 * Metapage initialization 961 */ 962 rc = metapage_init(); 963 if (rc) { 964 jfs_err("metapage_init failed w/rc = %d", rc); 965 goto free_slab; 966 } 967 968 /* 969 * Transaction Manager initialization 970 */ 971 rc = txInit(); 972 if (rc) { 973 jfs_err("txInit failed w/rc = %d", rc); 974 goto free_metapage; 975 } 976 977 /* 978 * I/O completion thread (endio) 979 */ 980 jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO"); 981 if (IS_ERR(jfsIOthread)) { 982 rc = PTR_ERR(jfsIOthread); 983 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 984 goto end_txmngr; 985 } 986 987 if (commit_threads < 1) 988 commit_threads = num_online_cpus(); 989 if (commit_threads > MAX_COMMIT_THREADS) 990 commit_threads = MAX_COMMIT_THREADS; 991 992 for (i = 0; i < commit_threads; i++) { 993 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, 994 "jfsCommit"); 995 if (IS_ERR(jfsCommitThread[i])) { 996 rc = PTR_ERR(jfsCommitThread[i]); 997 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 998 commit_threads = i; 999 goto kill_committask; 1000 } 1001 } 1002 1003 jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync"); 1004 if (IS_ERR(jfsSyncThread)) { 1005 rc = PTR_ERR(jfsSyncThread); 1006 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 1007 goto kill_committask; 1008 } 1009 1010 #ifdef PROC_FS_JFS 1011 jfs_proc_init(); 1012 #endif 1013 1014 rc = register_filesystem(&jfs_fs_type); 1015 if (!rc) 1016 return 0; 1017 1018 #ifdef PROC_FS_JFS 1019 jfs_proc_clean(); 1020 #endif 1021 kthread_stop(jfsSyncThread); 1022 kill_committask: 1023 for (i = 0; i < commit_threads; i++) 1024 kthread_stop(jfsCommitThread[i]); 1025 kthread_stop(jfsIOthread); 1026 end_txmngr: 1027 txExit(); 1028 free_metapage: 1029 metapage_exit(); 1030 free_slab: 1031 kmem_cache_destroy(jfs_inode_cachep); 1032 return rc; 1033 } 1034 1035 static void __exit exit_jfs_fs(void) 1036 { 1037 int i; 1038 1039 jfs_info("exit_jfs_fs called"); 1040 1041 txExit(); 1042 metapage_exit(); 1043 1044 kthread_stop(jfsIOthread); 1045 for (i = 0; i < commit_threads; i++) 1046 kthread_stop(jfsCommitThread[i]); 1047 kthread_stop(jfsSyncThread); 1048 #ifdef PROC_FS_JFS 1049 jfs_proc_clean(); 1050 #endif 1051 unregister_filesystem(&jfs_fs_type); 1052 1053 /* 1054 * Make sure all delayed rcu free inodes are flushed before we 1055 * destroy cache. 1056 */ 1057 rcu_barrier(); 1058 kmem_cache_destroy(jfs_inode_cachep); 1059 } 1060 1061 module_init(init_jfs_fs) 1062 module_exit(exit_jfs_fs) 1063