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 <asm/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 48 MODULE_DESCRIPTION("The Journaled Filesystem (JFS)"); 49 MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM"); 50 MODULE_LICENSE("GPL"); 51 52 static struct kmem_cache * jfs_inode_cachep; 53 54 static const struct super_operations jfs_super_operations; 55 static const struct export_operations jfs_export_operations; 56 static struct file_system_type jfs_fs_type; 57 58 #define MAX_COMMIT_THREADS 64 59 static int commit_threads = 0; 60 module_param(commit_threads, int, 0); 61 MODULE_PARM_DESC(commit_threads, "Number of commit threads"); 62 63 static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS]; 64 struct task_struct *jfsIOthread; 65 struct task_struct *jfsSyncThread; 66 67 #ifdef CONFIG_JFS_DEBUG 68 int jfsloglevel = JFS_LOGLEVEL_WARN; 69 module_param(jfsloglevel, int, 0644); 70 MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)"); 71 #endif 72 73 static void jfs_handle_error(struct super_block *sb) 74 { 75 struct jfs_sb_info *sbi = JFS_SBI(sb); 76 77 if (sb->s_flags & MS_RDONLY) 78 return; 79 80 updateSuper(sb, FM_DIRTY); 81 82 if (sbi->flag & JFS_ERR_PANIC) 83 panic("JFS (device %s): panic forced after error\n", 84 sb->s_id); 85 else if (sbi->flag & JFS_ERR_REMOUNT_RO) { 86 jfs_err("ERROR: (device %s): remounting filesystem " 87 "as read-only\n", 88 sb->s_id); 89 sb->s_flags |= MS_RDONLY; 90 } 91 92 /* nothing is done for continue beyond marking the superblock dirty */ 93 } 94 95 void jfs_error(struct super_block *sb, const char * function, ...) 96 { 97 static char error_buf[256]; 98 va_list args; 99 100 va_start(args, function); 101 vsnprintf(error_buf, sizeof(error_buf), function, args); 102 va_end(args); 103 104 pr_err("ERROR: (device %s): %s\n", sb->s_id, error_buf); 105 106 jfs_handle_error(sb); 107 } 108 109 static struct inode *jfs_alloc_inode(struct super_block *sb) 110 { 111 struct jfs_inode_info *jfs_inode; 112 113 jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS); 114 if (!jfs_inode) 115 return NULL; 116 return &jfs_inode->vfs_inode; 117 } 118 119 static void jfs_i_callback(struct rcu_head *head) 120 { 121 struct inode *inode = container_of(head, struct inode, i_rcu); 122 struct jfs_inode_info *ji = JFS_IP(inode); 123 kmem_cache_free(jfs_inode_cachep, ji); 124 } 125 126 static void jfs_destroy_inode(struct inode *inode) 127 { 128 struct jfs_inode_info *ji = JFS_IP(inode); 129 130 BUG_ON(!list_empty(&ji->anon_inode_list)); 131 132 spin_lock_irq(&ji->ag_lock); 133 if (ji->active_ag != -1) { 134 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap; 135 atomic_dec(&bmap->db_active[ji->active_ag]); 136 ji->active_ag = -1; 137 } 138 spin_unlock_irq(&ji->ag_lock); 139 call_rcu(&inode->i_rcu, jfs_i_callback); 140 } 141 142 static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf) 143 { 144 struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb); 145 s64 maxinodes; 146 struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap; 147 148 jfs_info("In jfs_statfs"); 149 buf->f_type = JFS_SUPER_MAGIC; 150 buf->f_bsize = sbi->bsize; 151 buf->f_blocks = sbi->bmap->db_mapsize; 152 buf->f_bfree = sbi->bmap->db_nfree; 153 buf->f_bavail = sbi->bmap->db_nfree; 154 /* 155 * If we really return the number of allocated & free inodes, some 156 * applications will fail because they won't see enough free inodes. 157 * We'll try to calculate some guess as to how many inodes we can 158 * really allocate 159 * 160 * buf->f_files = atomic_read(&imap->im_numinos); 161 * buf->f_ffree = atomic_read(&imap->im_numfree); 162 */ 163 maxinodes = min((s64) atomic_read(&imap->im_numinos) + 164 ((sbi->bmap->db_nfree >> imap->im_l2nbperiext) 165 << L2INOSPEREXT), (s64) 0xffffffffLL); 166 buf->f_files = maxinodes; 167 buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) - 168 atomic_read(&imap->im_numfree)); 169 buf->f_fsid.val[0] = (u32)crc32_le(0, sbi->uuid, sizeof(sbi->uuid)/2); 170 buf->f_fsid.val[1] = (u32)crc32_le(0, sbi->uuid + sizeof(sbi->uuid)/2, 171 sizeof(sbi->uuid)/2); 172 173 buf->f_namelen = JFS_NAME_MAX; 174 return 0; 175 } 176 177 static void jfs_put_super(struct super_block *sb) 178 { 179 struct jfs_sb_info *sbi = JFS_SBI(sb); 180 int rc; 181 182 jfs_info("In jfs_put_super"); 183 184 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); 185 186 rc = jfs_umount(sb); 187 if (rc) 188 jfs_err("jfs_umount failed with return code %d", rc); 189 190 unload_nls(sbi->nls_tab); 191 192 truncate_inode_pages(sbi->direct_inode->i_mapping, 0); 193 iput(sbi->direct_inode); 194 195 kfree(sbi); 196 } 197 198 enum { 199 Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize, 200 Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota, 201 Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask, 202 Opt_discard, Opt_nodiscard, Opt_discard_minblk 203 }; 204 205 static const match_table_t tokens = { 206 {Opt_integrity, "integrity"}, 207 {Opt_nointegrity, "nointegrity"}, 208 {Opt_iocharset, "iocharset=%s"}, 209 {Opt_resize, "resize=%u"}, 210 {Opt_resize_nosize, "resize"}, 211 {Opt_errors, "errors=%s"}, 212 {Opt_ignore, "noquota"}, 213 {Opt_ignore, "quota"}, 214 {Opt_usrquota, "usrquota"}, 215 {Opt_grpquota, "grpquota"}, 216 {Opt_uid, "uid=%u"}, 217 {Opt_gid, "gid=%u"}, 218 {Opt_umask, "umask=%u"}, 219 {Opt_discard, "discard"}, 220 {Opt_nodiscard, "nodiscard"}, 221 {Opt_discard_minblk, "discard=%u"}, 222 {Opt_err, NULL} 223 }; 224 225 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize, 226 int *flag) 227 { 228 void *nls_map = (void *)-1; /* -1: no change; NULL: none */ 229 char *p; 230 struct jfs_sb_info *sbi = JFS_SBI(sb); 231 232 *newLVSize = 0; 233 234 if (!options) 235 return 1; 236 237 while ((p = strsep(&options, ",")) != NULL) { 238 substring_t args[MAX_OPT_ARGS]; 239 int token; 240 if (!*p) 241 continue; 242 243 token = match_token(p, tokens, args); 244 switch (token) { 245 case Opt_integrity: 246 *flag &= ~JFS_NOINTEGRITY; 247 break; 248 case Opt_nointegrity: 249 *flag |= JFS_NOINTEGRITY; 250 break; 251 case Opt_ignore: 252 /* Silently ignore the quota options */ 253 /* Don't do anything ;-) */ 254 break; 255 case Opt_iocharset: 256 if (nls_map && nls_map != (void *) -1) 257 unload_nls(nls_map); 258 if (!strcmp(args[0].from, "none")) 259 nls_map = NULL; 260 else { 261 nls_map = load_nls(args[0].from); 262 if (!nls_map) { 263 pr_err("JFS: charset not found\n"); 264 goto cleanup; 265 } 266 } 267 break; 268 case Opt_resize: 269 { 270 char *resize = args[0].from; 271 *newLVSize = simple_strtoull(resize, &resize, 0); 272 break; 273 } 274 case Opt_resize_nosize: 275 { 276 *newLVSize = sb->s_bdev->bd_inode->i_size >> 277 sb->s_blocksize_bits; 278 if (*newLVSize == 0) 279 pr_err("JFS: Cannot determine volume size\n"); 280 break; 281 } 282 case Opt_errors: 283 { 284 char *errors = args[0].from; 285 if (!errors || !*errors) 286 goto cleanup; 287 if (!strcmp(errors, "continue")) { 288 *flag &= ~JFS_ERR_REMOUNT_RO; 289 *flag &= ~JFS_ERR_PANIC; 290 *flag |= JFS_ERR_CONTINUE; 291 } else if (!strcmp(errors, "remount-ro")) { 292 *flag &= ~JFS_ERR_CONTINUE; 293 *flag &= ~JFS_ERR_PANIC; 294 *flag |= JFS_ERR_REMOUNT_RO; 295 } else if (!strcmp(errors, "panic")) { 296 *flag &= ~JFS_ERR_CONTINUE; 297 *flag &= ~JFS_ERR_REMOUNT_RO; 298 *flag |= JFS_ERR_PANIC; 299 } else { 300 pr_err("JFS: %s is an invalid error handler\n", 301 errors); 302 goto cleanup; 303 } 304 break; 305 } 306 307 #ifdef CONFIG_QUOTA 308 case Opt_quota: 309 case Opt_usrquota: 310 *flag |= JFS_USRQUOTA; 311 break; 312 case Opt_grpquota: 313 *flag |= JFS_GRPQUOTA; 314 break; 315 #else 316 case Opt_usrquota: 317 case Opt_grpquota: 318 case Opt_quota: 319 pr_err("JFS: quota operations not supported\n"); 320 break; 321 #endif 322 case Opt_uid: 323 { 324 char *uid = args[0].from; 325 uid_t val = simple_strtoul(uid, &uid, 0); 326 sbi->uid = make_kuid(current_user_ns(), val); 327 if (!uid_valid(sbi->uid)) 328 goto cleanup; 329 break; 330 } 331 332 case Opt_gid: 333 { 334 char *gid = args[0].from; 335 gid_t val = simple_strtoul(gid, &gid, 0); 336 sbi->gid = make_kgid(current_user_ns(), val); 337 if (!gid_valid(sbi->gid)) 338 goto cleanup; 339 break; 340 } 341 342 case Opt_umask: 343 { 344 char *umask = args[0].from; 345 sbi->umask = simple_strtoul(umask, &umask, 8); 346 if (sbi->umask & ~0777) { 347 pr_err("JFS: Invalid value of umask\n"); 348 goto cleanup; 349 } 350 break; 351 } 352 353 case Opt_discard: 354 { 355 struct request_queue *q = bdev_get_queue(sb->s_bdev); 356 /* if set to 1, even copying files will cause 357 * trimming :O 358 * -> user has more control over the online trimming 359 */ 360 sbi->minblks_trim = 64; 361 if (blk_queue_discard(q)) { 362 *flag |= JFS_DISCARD; 363 } else { 364 pr_err("JFS: discard option " \ 365 "not supported on device\n"); 366 } 367 break; 368 } 369 370 case Opt_nodiscard: 371 *flag &= ~JFS_DISCARD; 372 break; 373 374 case Opt_discard_minblk: 375 { 376 struct request_queue *q = bdev_get_queue(sb->s_bdev); 377 char *minblks_trim = args[0].from; 378 if (blk_queue_discard(q)) { 379 *flag |= JFS_DISCARD; 380 sbi->minblks_trim = simple_strtoull( 381 minblks_trim, &minblks_trim, 0); 382 } else { 383 pr_err("JFS: discard option " \ 384 "not supported on device\n"); 385 } 386 break; 387 } 388 389 default: 390 printk("jfs: Unrecognized mount option \"%s\" " 391 " or missing value\n", p); 392 goto cleanup; 393 } 394 } 395 396 if (nls_map != (void *) -1) { 397 /* Discard old (if remount) */ 398 unload_nls(sbi->nls_tab); 399 sbi->nls_tab = nls_map; 400 } 401 return 1; 402 403 cleanup: 404 if (nls_map && nls_map != (void *) -1) 405 unload_nls(nls_map); 406 return 0; 407 } 408 409 static int jfs_remount(struct super_block *sb, int *flags, char *data) 410 { 411 s64 newLVSize = 0; 412 int rc = 0; 413 int flag = JFS_SBI(sb)->flag; 414 int ret; 415 416 if (!parse_options(data, sb, &newLVSize, &flag)) { 417 return -EINVAL; 418 } 419 420 if (newLVSize) { 421 if (sb->s_flags & MS_RDONLY) { 422 pr_err("JFS: resize requires volume" \ 423 " to be mounted read-write\n"); 424 return -EROFS; 425 } 426 rc = jfs_extendfs(sb, newLVSize, 0); 427 if (rc) 428 return rc; 429 } 430 431 if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) { 432 /* 433 * Invalidate any previously read metadata. fsck may have 434 * changed the on-disk data since we mounted r/o 435 */ 436 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0); 437 438 JFS_SBI(sb)->flag = flag; 439 ret = jfs_mount_rw(sb, 1); 440 441 /* mark the fs r/w for quota activity */ 442 sb->s_flags &= ~MS_RDONLY; 443 444 dquot_resume(sb, -1); 445 return ret; 446 } 447 if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) { 448 rc = dquot_suspend(sb, -1); 449 if (rc < 0) { 450 return rc; 451 } 452 rc = jfs_umount_rw(sb); 453 JFS_SBI(sb)->flag = flag; 454 return rc; 455 } 456 if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY)) 457 if (!(sb->s_flags & MS_RDONLY)) { 458 rc = jfs_umount_rw(sb); 459 if (rc) 460 return rc; 461 462 JFS_SBI(sb)->flag = flag; 463 ret = jfs_mount_rw(sb, 1); 464 return ret; 465 } 466 JFS_SBI(sb)->flag = flag; 467 468 return 0; 469 } 470 471 static int jfs_fill_super(struct super_block *sb, void *data, int silent) 472 { 473 struct jfs_sb_info *sbi; 474 struct inode *inode; 475 int rc; 476 s64 newLVSize = 0; 477 int flag, ret = -EINVAL; 478 479 jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags); 480 481 if (!new_valid_dev(sb->s_bdev->bd_dev)) 482 return -EOVERFLOW; 483 484 sbi = kzalloc(sizeof (struct jfs_sb_info), GFP_KERNEL); 485 if (!sbi) 486 return -ENOMEM; 487 488 sb->s_fs_info = sbi; 489 sb->s_max_links = JFS_LINK_MAX; 490 sbi->sb = sb; 491 sbi->uid = INVALID_UID; 492 sbi->gid = INVALID_GID; 493 sbi->umask = -1; 494 495 /* initialize the mount flag and determine the default error handler */ 496 flag = JFS_ERR_REMOUNT_RO; 497 498 if (!parse_options((char *) data, sb, &newLVSize, &flag)) 499 goto out_kfree; 500 sbi->flag = flag; 501 502 #ifdef CONFIG_JFS_POSIX_ACL 503 sb->s_flags |= MS_POSIXACL; 504 #endif 505 506 if (newLVSize) { 507 pr_err("resize option for remount only\n"); 508 goto out_kfree; 509 } 510 511 /* 512 * Initialize blocksize to 4K. 513 */ 514 sb_set_blocksize(sb, PSIZE); 515 516 /* 517 * Set method vectors. 518 */ 519 sb->s_op = &jfs_super_operations; 520 sb->s_export_op = &jfs_export_operations; 521 #ifdef CONFIG_QUOTA 522 sb->dq_op = &dquot_operations; 523 sb->s_qcop = &dquot_quotactl_ops; 524 #endif 525 526 /* 527 * Initialize direct-mapping inode/address-space 528 */ 529 inode = new_inode(sb); 530 if (inode == NULL) { 531 ret = -ENOMEM; 532 goto out_unload; 533 } 534 inode->i_ino = 0; 535 inode->i_size = sb->s_bdev->bd_inode->i_size; 536 inode->i_mapping->a_ops = &jfs_metapage_aops; 537 insert_inode_hash(inode); 538 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS); 539 540 sbi->direct_inode = inode; 541 542 rc = jfs_mount(sb); 543 if (rc) { 544 if (!silent) { 545 jfs_err("jfs_mount failed w/return code = %d", rc); 546 } 547 goto out_mount_failed; 548 } 549 if (sb->s_flags & MS_RDONLY) 550 sbi->log = NULL; 551 else { 552 rc = jfs_mount_rw(sb, 0); 553 if (rc) { 554 if (!silent) { 555 jfs_err("jfs_mount_rw failed, return code = %d", 556 rc); 557 } 558 goto out_no_rw; 559 } 560 } 561 562 sb->s_magic = JFS_SUPER_MAGIC; 563 564 if (sbi->mntflag & JFS_OS2) 565 sb->s_d_op = &jfs_ci_dentry_operations; 566 567 inode = jfs_iget(sb, ROOT_I); 568 if (IS_ERR(inode)) { 569 ret = PTR_ERR(inode); 570 goto out_no_rw; 571 } 572 sb->s_root = d_make_root(inode); 573 if (!sb->s_root) 574 goto out_no_root; 575 576 /* logical blocks are represented by 40 bits in pxd_t, etc. */ 577 sb->s_maxbytes = ((u64) sb->s_blocksize) << 40; 578 #if BITS_PER_LONG == 32 579 /* 580 * Page cache is indexed by long. 581 * I would use MAX_LFS_FILESIZE, but it's only half as big 582 */ 583 sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, (u64)sb->s_maxbytes); 584 #endif 585 sb->s_time_gran = 1; 586 return 0; 587 588 out_no_root: 589 jfs_err("jfs_read_super: get root dentry failed"); 590 591 out_no_rw: 592 rc = jfs_umount(sb); 593 if (rc) { 594 jfs_err("jfs_umount failed with return code %d", rc); 595 } 596 out_mount_failed: 597 filemap_write_and_wait(sbi->direct_inode->i_mapping); 598 truncate_inode_pages(sbi->direct_inode->i_mapping, 0); 599 make_bad_inode(sbi->direct_inode); 600 iput(sbi->direct_inode); 601 sbi->direct_inode = NULL; 602 out_unload: 603 if (sbi->nls_tab) 604 unload_nls(sbi->nls_tab); 605 out_kfree: 606 kfree(sbi); 607 return ret; 608 } 609 610 static int jfs_freeze(struct super_block *sb) 611 { 612 struct jfs_sb_info *sbi = JFS_SBI(sb); 613 struct jfs_log *log = sbi->log; 614 615 if (!(sb->s_flags & MS_RDONLY)) { 616 txQuiesce(sb); 617 lmLogShutdown(log); 618 updateSuper(sb, FM_CLEAN); 619 } 620 return 0; 621 } 622 623 static int jfs_unfreeze(struct super_block *sb) 624 { 625 struct jfs_sb_info *sbi = JFS_SBI(sb); 626 struct jfs_log *log = sbi->log; 627 int rc = 0; 628 629 if (!(sb->s_flags & MS_RDONLY)) { 630 updateSuper(sb, FM_MOUNT); 631 if ((rc = lmLogInit(log))) 632 jfs_err("jfs_unlock failed with return code %d", rc); 633 else 634 txResume(sb); 635 } 636 return 0; 637 } 638 639 static struct dentry *jfs_do_mount(struct file_system_type *fs_type, 640 int flags, const char *dev_name, void *data) 641 { 642 return mount_bdev(fs_type, flags, dev_name, data, jfs_fill_super); 643 } 644 645 static int jfs_sync_fs(struct super_block *sb, int wait) 646 { 647 struct jfs_log *log = JFS_SBI(sb)->log; 648 649 /* log == NULL indicates read-only mount */ 650 if (log) { 651 /* 652 * Write quota structures to quota file, sync_blockdev() will 653 * write them to disk later 654 */ 655 dquot_writeback_dquots(sb, -1); 656 jfs_flush_journal(log, wait); 657 jfs_syncpt(log, 0); 658 } 659 660 return 0; 661 } 662 663 static int jfs_show_options(struct seq_file *seq, struct dentry *root) 664 { 665 struct jfs_sb_info *sbi = JFS_SBI(root->d_sb); 666 667 if (uid_valid(sbi->uid)) 668 seq_printf(seq, ",uid=%d", from_kuid(&init_user_ns, sbi->uid)); 669 if (gid_valid(sbi->gid)) 670 seq_printf(seq, ",gid=%d", from_kgid(&init_user_ns, sbi->gid)); 671 if (sbi->umask != -1) 672 seq_printf(seq, ",umask=%03o", sbi->umask); 673 if (sbi->flag & JFS_NOINTEGRITY) 674 seq_puts(seq, ",nointegrity"); 675 if (sbi->flag & JFS_DISCARD) 676 seq_printf(seq, ",discard=%u", sbi->minblks_trim); 677 if (sbi->nls_tab) 678 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset); 679 if (sbi->flag & JFS_ERR_CONTINUE) 680 seq_printf(seq, ",errors=continue"); 681 if (sbi->flag & JFS_ERR_PANIC) 682 seq_printf(seq, ",errors=panic"); 683 684 #ifdef CONFIG_QUOTA 685 if (sbi->flag & JFS_USRQUOTA) 686 seq_puts(seq, ",usrquota"); 687 688 if (sbi->flag & JFS_GRPQUOTA) 689 seq_puts(seq, ",grpquota"); 690 #endif 691 692 return 0; 693 } 694 695 #ifdef CONFIG_QUOTA 696 697 /* Read data from quotafile - avoid pagecache and such because we cannot afford 698 * acquiring the locks... As quota files are never truncated and quota code 699 * itself serializes the operations (and no one else should touch the files) 700 * we don't have to be afraid of races */ 701 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data, 702 size_t len, loff_t off) 703 { 704 struct inode *inode = sb_dqopt(sb)->files[type]; 705 sector_t blk = off >> sb->s_blocksize_bits; 706 int err = 0; 707 int offset = off & (sb->s_blocksize - 1); 708 int tocopy; 709 size_t toread; 710 struct buffer_head tmp_bh; 711 struct buffer_head *bh; 712 loff_t i_size = i_size_read(inode); 713 714 if (off > i_size) 715 return 0; 716 if (off+len > i_size) 717 len = i_size-off; 718 toread = len; 719 while (toread > 0) { 720 tocopy = sb->s_blocksize - offset < toread ? 721 sb->s_blocksize - offset : toread; 722 723 tmp_bh.b_state = 0; 724 tmp_bh.b_size = 1 << inode->i_blkbits; 725 err = jfs_get_block(inode, blk, &tmp_bh, 0); 726 if (err) 727 return err; 728 if (!buffer_mapped(&tmp_bh)) /* A hole? */ 729 memset(data, 0, tocopy); 730 else { 731 bh = sb_bread(sb, tmp_bh.b_blocknr); 732 if (!bh) 733 return -EIO; 734 memcpy(data, bh->b_data+offset, tocopy); 735 brelse(bh); 736 } 737 offset = 0; 738 toread -= tocopy; 739 data += tocopy; 740 blk++; 741 } 742 return len; 743 } 744 745 /* Write to quotafile */ 746 static ssize_t jfs_quota_write(struct super_block *sb, int type, 747 const char *data, 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 towrite = len; 755 struct buffer_head tmp_bh; 756 struct buffer_head *bh; 757 758 mutex_lock(&inode->i_mutex); 759 while (towrite > 0) { 760 tocopy = sb->s_blocksize - offset < towrite ? 761 sb->s_blocksize - offset : towrite; 762 763 tmp_bh.b_state = 0; 764 tmp_bh.b_size = 1 << inode->i_blkbits; 765 err = jfs_get_block(inode, blk, &tmp_bh, 1); 766 if (err) 767 goto out; 768 if (offset || tocopy != sb->s_blocksize) 769 bh = sb_bread(sb, tmp_bh.b_blocknr); 770 else 771 bh = sb_getblk(sb, tmp_bh.b_blocknr); 772 if (!bh) { 773 err = -EIO; 774 goto out; 775 } 776 lock_buffer(bh); 777 memcpy(bh->b_data+offset, data, tocopy); 778 flush_dcache_page(bh->b_page); 779 set_buffer_uptodate(bh); 780 mark_buffer_dirty(bh); 781 unlock_buffer(bh); 782 brelse(bh); 783 offset = 0; 784 towrite -= tocopy; 785 data += tocopy; 786 blk++; 787 } 788 out: 789 if (len == towrite) { 790 mutex_unlock(&inode->i_mutex); 791 return err; 792 } 793 if (inode->i_size < off+len-towrite) 794 i_size_write(inode, off+len-towrite); 795 inode->i_version++; 796 inode->i_mtime = inode->i_ctime = CURRENT_TIME; 797 mark_inode_dirty(inode); 798 mutex_unlock(&inode->i_mutex); 799 return len - towrite; 800 } 801 802 #endif 803 804 static const struct super_operations jfs_super_operations = { 805 .alloc_inode = jfs_alloc_inode, 806 .destroy_inode = jfs_destroy_inode, 807 .dirty_inode = jfs_dirty_inode, 808 .write_inode = jfs_write_inode, 809 .evict_inode = jfs_evict_inode, 810 .put_super = jfs_put_super, 811 .sync_fs = jfs_sync_fs, 812 .freeze_fs = jfs_freeze, 813 .unfreeze_fs = jfs_unfreeze, 814 .statfs = jfs_statfs, 815 .remount_fs = jfs_remount, 816 .show_options = jfs_show_options, 817 #ifdef CONFIG_QUOTA 818 .quota_read = jfs_quota_read, 819 .quota_write = jfs_quota_write, 820 #endif 821 }; 822 823 static const struct export_operations jfs_export_operations = { 824 .fh_to_dentry = jfs_fh_to_dentry, 825 .fh_to_parent = jfs_fh_to_parent, 826 .get_parent = jfs_get_parent, 827 }; 828 829 static struct file_system_type jfs_fs_type = { 830 .owner = THIS_MODULE, 831 .name = "jfs", 832 .mount = jfs_do_mount, 833 .kill_sb = kill_block_super, 834 .fs_flags = FS_REQUIRES_DEV, 835 }; 836 MODULE_ALIAS_FS("jfs"); 837 838 static void init_once(void *foo) 839 { 840 struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo; 841 842 memset(jfs_ip, 0, sizeof(struct jfs_inode_info)); 843 INIT_LIST_HEAD(&jfs_ip->anon_inode_list); 844 init_rwsem(&jfs_ip->rdwrlock); 845 mutex_init(&jfs_ip->commit_mutex); 846 init_rwsem(&jfs_ip->xattr_sem); 847 spin_lock_init(&jfs_ip->ag_lock); 848 jfs_ip->active_ag = -1; 849 inode_init_once(&jfs_ip->vfs_inode); 850 } 851 852 static int __init init_jfs_fs(void) 853 { 854 int i; 855 int rc; 856 857 jfs_inode_cachep = 858 kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0, 859 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, 860 init_once); 861 if (jfs_inode_cachep == NULL) 862 return -ENOMEM; 863 864 /* 865 * Metapage initialization 866 */ 867 rc = metapage_init(); 868 if (rc) { 869 jfs_err("metapage_init failed w/rc = %d", rc); 870 goto free_slab; 871 } 872 873 /* 874 * Transaction Manager initialization 875 */ 876 rc = txInit(); 877 if (rc) { 878 jfs_err("txInit failed w/rc = %d", rc); 879 goto free_metapage; 880 } 881 882 /* 883 * I/O completion thread (endio) 884 */ 885 jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO"); 886 if (IS_ERR(jfsIOthread)) { 887 rc = PTR_ERR(jfsIOthread); 888 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 889 goto end_txmngr; 890 } 891 892 if (commit_threads < 1) 893 commit_threads = num_online_cpus(); 894 if (commit_threads > MAX_COMMIT_THREADS) 895 commit_threads = MAX_COMMIT_THREADS; 896 897 for (i = 0; i < commit_threads; i++) { 898 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, "jfsCommit"); 899 if (IS_ERR(jfsCommitThread[i])) { 900 rc = PTR_ERR(jfsCommitThread[i]); 901 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 902 commit_threads = i; 903 goto kill_committask; 904 } 905 } 906 907 jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync"); 908 if (IS_ERR(jfsSyncThread)) { 909 rc = PTR_ERR(jfsSyncThread); 910 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 911 goto kill_committask; 912 } 913 914 #ifdef PROC_FS_JFS 915 jfs_proc_init(); 916 #endif 917 918 rc = register_filesystem(&jfs_fs_type); 919 if (!rc) 920 return 0; 921 922 #ifdef PROC_FS_JFS 923 jfs_proc_clean(); 924 #endif 925 kthread_stop(jfsSyncThread); 926 kill_committask: 927 for (i = 0; i < commit_threads; i++) 928 kthread_stop(jfsCommitThread[i]); 929 kthread_stop(jfsIOthread); 930 end_txmngr: 931 txExit(); 932 free_metapage: 933 metapage_exit(); 934 free_slab: 935 kmem_cache_destroy(jfs_inode_cachep); 936 return rc; 937 } 938 939 static void __exit exit_jfs_fs(void) 940 { 941 int i; 942 943 jfs_info("exit_jfs_fs called"); 944 945 txExit(); 946 metapage_exit(); 947 948 kthread_stop(jfsIOthread); 949 for (i = 0; i < commit_threads; i++) 950 kthread_stop(jfsCommitThread[i]); 951 kthread_stop(jfsSyncThread); 952 #ifdef PROC_FS_JFS 953 jfs_proc_clean(); 954 #endif 955 unregister_filesystem(&jfs_fs_type); 956 957 /* 958 * Make sure all delayed rcu free inodes are flushed before we 959 * destroy cache. 960 */ 961 rcu_barrier(); 962 kmem_cache_destroy(jfs_inode_cachep); 963 } 964 965 module_init(init_jfs_fs) 966 module_exit(exit_jfs_fs) 967