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 37 #include "jfs_incore.h" 38 #include "jfs_filsys.h" 39 #include "jfs_inode.h" 40 #include "jfs_metapage.h" 41 #include "jfs_superblock.h" 42 #include "jfs_dmap.h" 43 #include "jfs_imap.h" 44 #include "jfs_acl.h" 45 #include "jfs_debug.h" 46 47 MODULE_DESCRIPTION("The Journaled Filesystem (JFS)"); 48 MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM"); 49 MODULE_LICENSE("GPL"); 50 51 static struct kmem_cache * jfs_inode_cachep; 52 53 static const struct super_operations jfs_super_operations; 54 static const struct export_operations jfs_export_operations; 55 static struct file_system_type jfs_fs_type; 56 57 #define MAX_COMMIT_THREADS 64 58 static int commit_threads = 0; 59 module_param(commit_threads, int, 0); 60 MODULE_PARM_DESC(commit_threads, "Number of commit threads"); 61 62 static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS]; 63 struct task_struct *jfsIOthread; 64 struct task_struct *jfsSyncThread; 65 66 #ifdef CONFIG_JFS_DEBUG 67 int jfsloglevel = JFS_LOGLEVEL_WARN; 68 module_param(jfsloglevel, int, 0644); 69 MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)"); 70 #endif 71 72 static void jfs_handle_error(struct super_block *sb) 73 { 74 struct jfs_sb_info *sbi = JFS_SBI(sb); 75 76 if (sb->s_flags & MS_RDONLY) 77 return; 78 79 updateSuper(sb, FM_DIRTY); 80 81 if (sbi->flag & JFS_ERR_PANIC) 82 panic("JFS (device %s): panic forced after error\n", 83 sb->s_id); 84 else if (sbi->flag & JFS_ERR_REMOUNT_RO) { 85 jfs_err("ERROR: (device %s): remounting filesystem " 86 "as read-only\n", 87 sb->s_id); 88 sb->s_flags |= MS_RDONLY; 89 } 90 91 /* nothing is done for continue beyond marking the superblock dirty */ 92 } 93 94 void jfs_error(struct super_block *sb, const char * function, ...) 95 { 96 static char error_buf[256]; 97 va_list args; 98 99 va_start(args, function); 100 vsnprintf(error_buf, sizeof(error_buf), function, args); 101 va_end(args); 102 103 printk(KERN_ERR "ERROR: (device %s): %s\n", sb->s_id, error_buf); 104 105 jfs_handle_error(sb); 106 } 107 108 static struct inode *jfs_alloc_inode(struct super_block *sb) 109 { 110 struct jfs_inode_info *jfs_inode; 111 112 jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS); 113 if (!jfs_inode) 114 return NULL; 115 return &jfs_inode->vfs_inode; 116 } 117 118 static void jfs_i_callback(struct rcu_head *head) 119 { 120 struct inode *inode = container_of(head, struct inode, i_rcu); 121 struct jfs_inode_info *ji = JFS_IP(inode); 122 kmem_cache_free(jfs_inode_cachep, ji); 123 } 124 125 static void jfs_destroy_inode(struct inode *inode) 126 { 127 struct jfs_inode_info *ji = JFS_IP(inode); 128 129 BUG_ON(!list_empty(&ji->anon_inode_list)); 130 131 spin_lock_irq(&ji->ag_lock); 132 if (ji->active_ag != -1) { 133 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap; 134 atomic_dec(&bmap->db_active[ji->active_ag]); 135 ji->active_ag = -1; 136 } 137 spin_unlock_irq(&ji->ag_lock); 138 call_rcu(&inode->i_rcu, jfs_i_callback); 139 } 140 141 static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf) 142 { 143 struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb); 144 s64 maxinodes; 145 struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap; 146 147 jfs_info("In jfs_statfs"); 148 buf->f_type = JFS_SUPER_MAGIC; 149 buf->f_bsize = sbi->bsize; 150 buf->f_blocks = sbi->bmap->db_mapsize; 151 buf->f_bfree = sbi->bmap->db_nfree; 152 buf->f_bavail = sbi->bmap->db_nfree; 153 /* 154 * If we really return the number of allocated & free inodes, some 155 * applications will fail because they won't see enough free inodes. 156 * We'll try to calculate some guess as to how may inodes we can 157 * really allocate 158 * 159 * buf->f_files = atomic_read(&imap->im_numinos); 160 * buf->f_ffree = atomic_read(&imap->im_numfree); 161 */ 162 maxinodes = min((s64) atomic_read(&imap->im_numinos) + 163 ((sbi->bmap->db_nfree >> imap->im_l2nbperiext) 164 << L2INOSPEREXT), (s64) 0xffffffffLL); 165 buf->f_files = maxinodes; 166 buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) - 167 atomic_read(&imap->im_numfree)); 168 buf->f_fsid.val[0] = (u32)crc32_le(0, sbi->uuid, sizeof(sbi->uuid)/2); 169 buf->f_fsid.val[1] = (u32)crc32_le(0, sbi->uuid + sizeof(sbi->uuid)/2, 170 sizeof(sbi->uuid)/2); 171 172 buf->f_namelen = JFS_NAME_MAX; 173 return 0; 174 } 175 176 static void jfs_put_super(struct super_block *sb) 177 { 178 struct jfs_sb_info *sbi = JFS_SBI(sb); 179 int rc; 180 181 jfs_info("In jfs_put_super"); 182 183 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); 184 185 rc = jfs_umount(sb); 186 if (rc) 187 jfs_err("jfs_umount failed with return code %d", rc); 188 189 unload_nls(sbi->nls_tab); 190 191 truncate_inode_pages(sbi->direct_inode->i_mapping, 0); 192 iput(sbi->direct_inode); 193 194 kfree(sbi); 195 } 196 197 enum { 198 Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize, 199 Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota, 200 Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask 201 }; 202 203 static const match_table_t tokens = { 204 {Opt_integrity, "integrity"}, 205 {Opt_nointegrity, "nointegrity"}, 206 {Opt_iocharset, "iocharset=%s"}, 207 {Opt_resize, "resize=%u"}, 208 {Opt_resize_nosize, "resize"}, 209 {Opt_errors, "errors=%s"}, 210 {Opt_ignore, "noquota"}, 211 {Opt_ignore, "quota"}, 212 {Opt_usrquota, "usrquota"}, 213 {Opt_grpquota, "grpquota"}, 214 {Opt_uid, "uid=%u"}, 215 {Opt_gid, "gid=%u"}, 216 {Opt_umask, "umask=%u"}, 217 {Opt_err, NULL} 218 }; 219 220 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize, 221 int *flag) 222 { 223 void *nls_map = (void *)-1; /* -1: no change; NULL: none */ 224 char *p; 225 struct jfs_sb_info *sbi = JFS_SBI(sb); 226 227 *newLVSize = 0; 228 229 if (!options) 230 return 1; 231 232 while ((p = strsep(&options, ",")) != NULL) { 233 substring_t args[MAX_OPT_ARGS]; 234 int token; 235 if (!*p) 236 continue; 237 238 token = match_token(p, tokens, args); 239 switch (token) { 240 case Opt_integrity: 241 *flag &= ~JFS_NOINTEGRITY; 242 break; 243 case Opt_nointegrity: 244 *flag |= JFS_NOINTEGRITY; 245 break; 246 case Opt_ignore: 247 /* Silently ignore the quota options */ 248 /* Don't do anything ;-) */ 249 break; 250 case Opt_iocharset: 251 if (nls_map && nls_map != (void *) -1) 252 unload_nls(nls_map); 253 if (!strcmp(args[0].from, "none")) 254 nls_map = NULL; 255 else { 256 nls_map = load_nls(args[0].from); 257 if (!nls_map) { 258 printk(KERN_ERR 259 "JFS: charset not found\n"); 260 goto cleanup; 261 } 262 } 263 break; 264 case Opt_resize: 265 { 266 char *resize = args[0].from; 267 *newLVSize = simple_strtoull(resize, &resize, 0); 268 break; 269 } 270 case Opt_resize_nosize: 271 { 272 *newLVSize = sb->s_bdev->bd_inode->i_size >> 273 sb->s_blocksize_bits; 274 if (*newLVSize == 0) 275 printk(KERN_ERR 276 "JFS: Cannot determine volume size\n"); 277 break; 278 } 279 case Opt_errors: 280 { 281 char *errors = args[0].from; 282 if (!errors || !*errors) 283 goto cleanup; 284 if (!strcmp(errors, "continue")) { 285 *flag &= ~JFS_ERR_REMOUNT_RO; 286 *flag &= ~JFS_ERR_PANIC; 287 *flag |= JFS_ERR_CONTINUE; 288 } else if (!strcmp(errors, "remount-ro")) { 289 *flag &= ~JFS_ERR_CONTINUE; 290 *flag &= ~JFS_ERR_PANIC; 291 *flag |= JFS_ERR_REMOUNT_RO; 292 } else if (!strcmp(errors, "panic")) { 293 *flag &= ~JFS_ERR_CONTINUE; 294 *flag &= ~JFS_ERR_REMOUNT_RO; 295 *flag |= JFS_ERR_PANIC; 296 } else { 297 printk(KERN_ERR 298 "JFS: %s is an invalid error handler\n", 299 errors); 300 goto cleanup; 301 } 302 break; 303 } 304 305 #ifdef CONFIG_QUOTA 306 case Opt_quota: 307 case Opt_usrquota: 308 *flag |= JFS_USRQUOTA; 309 break; 310 case Opt_grpquota: 311 *flag |= JFS_GRPQUOTA; 312 break; 313 #else 314 case Opt_usrquota: 315 case Opt_grpquota: 316 case Opt_quota: 317 printk(KERN_ERR 318 "JFS: quota operations not supported\n"); 319 break; 320 #endif 321 case Opt_uid: 322 { 323 char *uid = args[0].from; 324 sbi->uid = simple_strtoul(uid, &uid, 0); 325 break; 326 } 327 case Opt_gid: 328 { 329 char *gid = args[0].from; 330 sbi->gid = simple_strtoul(gid, &gid, 0); 331 break; 332 } 333 case Opt_umask: 334 { 335 char *umask = args[0].from; 336 sbi->umask = simple_strtoul(umask, &umask, 8); 337 if (sbi->umask & ~0777) { 338 printk(KERN_ERR 339 "JFS: Invalid value of umask\n"); 340 goto cleanup; 341 } 342 break; 343 } 344 default: 345 printk("jfs: Unrecognized mount option \"%s\" " 346 " or missing value\n", p); 347 goto cleanup; 348 } 349 } 350 351 if (nls_map != (void *) -1) { 352 /* Discard old (if remount) */ 353 unload_nls(sbi->nls_tab); 354 sbi->nls_tab = nls_map; 355 } 356 return 1; 357 358 cleanup: 359 if (nls_map && nls_map != (void *) -1) 360 unload_nls(nls_map); 361 return 0; 362 } 363 364 static int jfs_remount(struct super_block *sb, int *flags, char *data) 365 { 366 s64 newLVSize = 0; 367 int rc = 0; 368 int flag = JFS_SBI(sb)->flag; 369 int ret; 370 371 if (!parse_options(data, sb, &newLVSize, &flag)) { 372 return -EINVAL; 373 } 374 375 if (newLVSize) { 376 if (sb->s_flags & MS_RDONLY) { 377 printk(KERN_ERR 378 "JFS: resize requires volume to be mounted read-write\n"); 379 return -EROFS; 380 } 381 rc = jfs_extendfs(sb, newLVSize, 0); 382 if (rc) 383 return rc; 384 } 385 386 if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) { 387 /* 388 * Invalidate any previously read metadata. fsck may have 389 * changed the on-disk data since we mounted r/o 390 */ 391 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0); 392 393 JFS_SBI(sb)->flag = flag; 394 ret = jfs_mount_rw(sb, 1); 395 396 /* mark the fs r/w for quota activity */ 397 sb->s_flags &= ~MS_RDONLY; 398 399 dquot_resume(sb, -1); 400 return ret; 401 } 402 if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) { 403 rc = dquot_suspend(sb, -1); 404 if (rc < 0) { 405 return rc; 406 } 407 rc = jfs_umount_rw(sb); 408 JFS_SBI(sb)->flag = flag; 409 return rc; 410 } 411 if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY)) 412 if (!(sb->s_flags & MS_RDONLY)) { 413 rc = jfs_umount_rw(sb); 414 if (rc) 415 return rc; 416 417 JFS_SBI(sb)->flag = flag; 418 ret = jfs_mount_rw(sb, 1); 419 return ret; 420 } 421 JFS_SBI(sb)->flag = flag; 422 423 return 0; 424 } 425 426 static int jfs_fill_super(struct super_block *sb, void *data, int silent) 427 { 428 struct jfs_sb_info *sbi; 429 struct inode *inode; 430 int rc; 431 s64 newLVSize = 0; 432 int flag, ret = -EINVAL; 433 434 jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags); 435 436 if (!new_valid_dev(sb->s_bdev->bd_dev)) 437 return -EOVERFLOW; 438 439 sbi = kzalloc(sizeof (struct jfs_sb_info), GFP_KERNEL); 440 if (!sbi) 441 return -ENOMEM; 442 443 sb->s_fs_info = sbi; 444 sb->s_max_links = JFS_LINK_MAX; 445 sbi->sb = sb; 446 sbi->uid = sbi->gid = sbi->umask = -1; 447 448 /* initialize the mount flag and determine the default error handler */ 449 flag = JFS_ERR_REMOUNT_RO; 450 451 if (!parse_options((char *) data, sb, &newLVSize, &flag)) 452 goto out_kfree; 453 sbi->flag = flag; 454 455 #ifdef CONFIG_JFS_POSIX_ACL 456 sb->s_flags |= MS_POSIXACL; 457 #endif 458 459 if (newLVSize) { 460 printk(KERN_ERR "resize option for remount only\n"); 461 goto out_kfree; 462 } 463 464 /* 465 * Initialize blocksize to 4K. 466 */ 467 sb_set_blocksize(sb, PSIZE); 468 469 /* 470 * Set method vectors. 471 */ 472 sb->s_op = &jfs_super_operations; 473 sb->s_export_op = &jfs_export_operations; 474 #ifdef CONFIG_QUOTA 475 sb->dq_op = &dquot_operations; 476 sb->s_qcop = &dquot_quotactl_ops; 477 #endif 478 479 /* 480 * Initialize direct-mapping inode/address-space 481 */ 482 inode = new_inode(sb); 483 if (inode == NULL) { 484 ret = -ENOMEM; 485 goto out_unload; 486 } 487 inode->i_ino = 0; 488 inode->i_size = sb->s_bdev->bd_inode->i_size; 489 inode->i_mapping->a_ops = &jfs_metapage_aops; 490 insert_inode_hash(inode); 491 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS); 492 493 sbi->direct_inode = inode; 494 495 rc = jfs_mount(sb); 496 if (rc) { 497 if (!silent) { 498 jfs_err("jfs_mount failed w/return code = %d", rc); 499 } 500 goto out_mount_failed; 501 } 502 if (sb->s_flags & MS_RDONLY) 503 sbi->log = NULL; 504 else { 505 rc = jfs_mount_rw(sb, 0); 506 if (rc) { 507 if (!silent) { 508 jfs_err("jfs_mount_rw failed, return code = %d", 509 rc); 510 } 511 goto out_no_rw; 512 } 513 } 514 515 sb->s_magic = JFS_SUPER_MAGIC; 516 517 if (sbi->mntflag & JFS_OS2) 518 sb->s_d_op = &jfs_ci_dentry_operations; 519 520 inode = jfs_iget(sb, ROOT_I); 521 if (IS_ERR(inode)) { 522 ret = PTR_ERR(inode); 523 goto out_no_rw; 524 } 525 sb->s_root = d_make_root(inode); 526 if (!sb->s_root) 527 goto out_no_root; 528 529 /* logical blocks are represented by 40 bits in pxd_t, etc. */ 530 sb->s_maxbytes = ((u64) sb->s_blocksize) << 40; 531 #if BITS_PER_LONG == 32 532 /* 533 * Page cache is indexed by long. 534 * I would use MAX_LFS_FILESIZE, but it's only half as big 535 */ 536 sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, (u64)sb->s_maxbytes); 537 #endif 538 sb->s_time_gran = 1; 539 return 0; 540 541 out_no_root: 542 jfs_err("jfs_read_super: get root dentry failed"); 543 544 out_no_rw: 545 rc = jfs_umount(sb); 546 if (rc) { 547 jfs_err("jfs_umount failed with return code %d", rc); 548 } 549 out_mount_failed: 550 filemap_write_and_wait(sbi->direct_inode->i_mapping); 551 truncate_inode_pages(sbi->direct_inode->i_mapping, 0); 552 make_bad_inode(sbi->direct_inode); 553 iput(sbi->direct_inode); 554 sbi->direct_inode = NULL; 555 out_unload: 556 if (sbi->nls_tab) 557 unload_nls(sbi->nls_tab); 558 out_kfree: 559 kfree(sbi); 560 return ret; 561 } 562 563 static int jfs_freeze(struct super_block *sb) 564 { 565 struct jfs_sb_info *sbi = JFS_SBI(sb); 566 struct jfs_log *log = sbi->log; 567 568 if (!(sb->s_flags & MS_RDONLY)) { 569 txQuiesce(sb); 570 lmLogShutdown(log); 571 updateSuper(sb, FM_CLEAN); 572 } 573 return 0; 574 } 575 576 static int jfs_unfreeze(struct super_block *sb) 577 { 578 struct jfs_sb_info *sbi = JFS_SBI(sb); 579 struct jfs_log *log = sbi->log; 580 int rc = 0; 581 582 if (!(sb->s_flags & MS_RDONLY)) { 583 updateSuper(sb, FM_MOUNT); 584 if ((rc = lmLogInit(log))) 585 jfs_err("jfs_unlock failed with return code %d", rc); 586 else 587 txResume(sb); 588 } 589 return 0; 590 } 591 592 static struct dentry *jfs_do_mount(struct file_system_type *fs_type, 593 int flags, const char *dev_name, void *data) 594 { 595 return mount_bdev(fs_type, flags, dev_name, data, jfs_fill_super); 596 } 597 598 static int jfs_sync_fs(struct super_block *sb, int wait) 599 { 600 struct jfs_log *log = JFS_SBI(sb)->log; 601 602 /* log == NULL indicates read-only mount */ 603 if (log) { 604 /* 605 * Write quota structures to quota file, sync_blockdev() will 606 * write them to disk later 607 */ 608 dquot_writeback_dquots(sb, -1); 609 jfs_flush_journal(log, wait); 610 jfs_syncpt(log, 0); 611 } 612 613 return 0; 614 } 615 616 static int jfs_show_options(struct seq_file *seq, struct dentry *root) 617 { 618 struct jfs_sb_info *sbi = JFS_SBI(root->d_sb); 619 620 if (sbi->uid != -1) 621 seq_printf(seq, ",uid=%d", sbi->uid); 622 if (sbi->gid != -1) 623 seq_printf(seq, ",gid=%d", sbi->gid); 624 if (sbi->umask != -1) 625 seq_printf(seq, ",umask=%03o", sbi->umask); 626 if (sbi->flag & JFS_NOINTEGRITY) 627 seq_puts(seq, ",nointegrity"); 628 if (sbi->nls_tab) 629 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset); 630 if (sbi->flag & JFS_ERR_CONTINUE) 631 seq_printf(seq, ",errors=continue"); 632 if (sbi->flag & JFS_ERR_PANIC) 633 seq_printf(seq, ",errors=panic"); 634 635 #ifdef CONFIG_QUOTA 636 if (sbi->flag & JFS_USRQUOTA) 637 seq_puts(seq, ",usrquota"); 638 639 if (sbi->flag & JFS_GRPQUOTA) 640 seq_puts(seq, ",grpquota"); 641 #endif 642 643 return 0; 644 } 645 646 #ifdef CONFIG_QUOTA 647 648 /* Read data from quotafile - avoid pagecache and such because we cannot afford 649 * acquiring the locks... As quota files are never truncated and quota code 650 * itself serializes the operations (and no one else should touch the files) 651 * we don't have to be afraid of races */ 652 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data, 653 size_t len, loff_t off) 654 { 655 struct inode *inode = sb_dqopt(sb)->files[type]; 656 sector_t blk = off >> sb->s_blocksize_bits; 657 int err = 0; 658 int offset = off & (sb->s_blocksize - 1); 659 int tocopy; 660 size_t toread; 661 struct buffer_head tmp_bh; 662 struct buffer_head *bh; 663 loff_t i_size = i_size_read(inode); 664 665 if (off > i_size) 666 return 0; 667 if (off+len > i_size) 668 len = i_size-off; 669 toread = len; 670 while (toread > 0) { 671 tocopy = sb->s_blocksize - offset < toread ? 672 sb->s_blocksize - offset : toread; 673 674 tmp_bh.b_state = 0; 675 tmp_bh.b_size = 1 << inode->i_blkbits; 676 err = jfs_get_block(inode, blk, &tmp_bh, 0); 677 if (err) 678 return err; 679 if (!buffer_mapped(&tmp_bh)) /* A hole? */ 680 memset(data, 0, tocopy); 681 else { 682 bh = sb_bread(sb, tmp_bh.b_blocknr); 683 if (!bh) 684 return -EIO; 685 memcpy(data, bh->b_data+offset, tocopy); 686 brelse(bh); 687 } 688 offset = 0; 689 toread -= tocopy; 690 data += tocopy; 691 blk++; 692 } 693 return len; 694 } 695 696 /* Write to quotafile */ 697 static ssize_t jfs_quota_write(struct super_block *sb, int type, 698 const char *data, size_t len, loff_t off) 699 { 700 struct inode *inode = sb_dqopt(sb)->files[type]; 701 sector_t blk = off >> sb->s_blocksize_bits; 702 int err = 0; 703 int offset = off & (sb->s_blocksize - 1); 704 int tocopy; 705 size_t towrite = len; 706 struct buffer_head tmp_bh; 707 struct buffer_head *bh; 708 709 mutex_lock(&inode->i_mutex); 710 while (towrite > 0) { 711 tocopy = sb->s_blocksize - offset < towrite ? 712 sb->s_blocksize - offset : towrite; 713 714 tmp_bh.b_state = 0; 715 tmp_bh.b_size = 1 << inode->i_blkbits; 716 err = jfs_get_block(inode, blk, &tmp_bh, 1); 717 if (err) 718 goto out; 719 if (offset || tocopy != sb->s_blocksize) 720 bh = sb_bread(sb, tmp_bh.b_blocknr); 721 else 722 bh = sb_getblk(sb, tmp_bh.b_blocknr); 723 if (!bh) { 724 err = -EIO; 725 goto out; 726 } 727 lock_buffer(bh); 728 memcpy(bh->b_data+offset, data, tocopy); 729 flush_dcache_page(bh->b_page); 730 set_buffer_uptodate(bh); 731 mark_buffer_dirty(bh); 732 unlock_buffer(bh); 733 brelse(bh); 734 offset = 0; 735 towrite -= tocopy; 736 data += tocopy; 737 blk++; 738 } 739 out: 740 if (len == towrite) { 741 mutex_unlock(&inode->i_mutex); 742 return err; 743 } 744 if (inode->i_size < off+len-towrite) 745 i_size_write(inode, off+len-towrite); 746 inode->i_version++; 747 inode->i_mtime = inode->i_ctime = CURRENT_TIME; 748 mark_inode_dirty(inode); 749 mutex_unlock(&inode->i_mutex); 750 return len - towrite; 751 } 752 753 #endif 754 755 static const struct super_operations jfs_super_operations = { 756 .alloc_inode = jfs_alloc_inode, 757 .destroy_inode = jfs_destroy_inode, 758 .dirty_inode = jfs_dirty_inode, 759 .write_inode = jfs_write_inode, 760 .evict_inode = jfs_evict_inode, 761 .put_super = jfs_put_super, 762 .sync_fs = jfs_sync_fs, 763 .freeze_fs = jfs_freeze, 764 .unfreeze_fs = jfs_unfreeze, 765 .statfs = jfs_statfs, 766 .remount_fs = jfs_remount, 767 .show_options = jfs_show_options, 768 #ifdef CONFIG_QUOTA 769 .quota_read = jfs_quota_read, 770 .quota_write = jfs_quota_write, 771 #endif 772 }; 773 774 static const struct export_operations jfs_export_operations = { 775 .fh_to_dentry = jfs_fh_to_dentry, 776 .fh_to_parent = jfs_fh_to_parent, 777 .get_parent = jfs_get_parent, 778 }; 779 780 static struct file_system_type jfs_fs_type = { 781 .owner = THIS_MODULE, 782 .name = "jfs", 783 .mount = jfs_do_mount, 784 .kill_sb = kill_block_super, 785 .fs_flags = FS_REQUIRES_DEV, 786 }; 787 788 static void init_once(void *foo) 789 { 790 struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo; 791 792 memset(jfs_ip, 0, sizeof(struct jfs_inode_info)); 793 INIT_LIST_HEAD(&jfs_ip->anon_inode_list); 794 init_rwsem(&jfs_ip->rdwrlock); 795 mutex_init(&jfs_ip->commit_mutex); 796 init_rwsem(&jfs_ip->xattr_sem); 797 spin_lock_init(&jfs_ip->ag_lock); 798 jfs_ip->active_ag = -1; 799 inode_init_once(&jfs_ip->vfs_inode); 800 } 801 802 static int __init init_jfs_fs(void) 803 { 804 int i; 805 int rc; 806 807 jfs_inode_cachep = 808 kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0, 809 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, 810 init_once); 811 if (jfs_inode_cachep == NULL) 812 return -ENOMEM; 813 814 /* 815 * Metapage initialization 816 */ 817 rc = metapage_init(); 818 if (rc) { 819 jfs_err("metapage_init failed w/rc = %d", rc); 820 goto free_slab; 821 } 822 823 /* 824 * Transaction Manager initialization 825 */ 826 rc = txInit(); 827 if (rc) { 828 jfs_err("txInit failed w/rc = %d", rc); 829 goto free_metapage; 830 } 831 832 /* 833 * I/O completion thread (endio) 834 */ 835 jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO"); 836 if (IS_ERR(jfsIOthread)) { 837 rc = PTR_ERR(jfsIOthread); 838 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 839 goto end_txmngr; 840 } 841 842 if (commit_threads < 1) 843 commit_threads = num_online_cpus(); 844 if (commit_threads > MAX_COMMIT_THREADS) 845 commit_threads = MAX_COMMIT_THREADS; 846 847 for (i = 0; i < commit_threads; i++) { 848 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, "jfsCommit"); 849 if (IS_ERR(jfsCommitThread[i])) { 850 rc = PTR_ERR(jfsCommitThread[i]); 851 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 852 commit_threads = i; 853 goto kill_committask; 854 } 855 } 856 857 jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync"); 858 if (IS_ERR(jfsSyncThread)) { 859 rc = PTR_ERR(jfsSyncThread); 860 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 861 goto kill_committask; 862 } 863 864 #ifdef PROC_FS_JFS 865 jfs_proc_init(); 866 #endif 867 868 rc = register_filesystem(&jfs_fs_type); 869 if (!rc) 870 return 0; 871 872 #ifdef PROC_FS_JFS 873 jfs_proc_clean(); 874 #endif 875 kthread_stop(jfsSyncThread); 876 kill_committask: 877 for (i = 0; i < commit_threads; i++) 878 kthread_stop(jfsCommitThread[i]); 879 kthread_stop(jfsIOthread); 880 end_txmngr: 881 txExit(); 882 free_metapage: 883 metapage_exit(); 884 free_slab: 885 kmem_cache_destroy(jfs_inode_cachep); 886 return rc; 887 } 888 889 static void __exit exit_jfs_fs(void) 890 { 891 int i; 892 893 jfs_info("exit_jfs_fs called"); 894 895 txExit(); 896 metapage_exit(); 897 898 kthread_stop(jfsIOthread); 899 for (i = 0; i < commit_threads; i++) 900 kthread_stop(jfsCommitThread[i]); 901 kthread_stop(jfsSyncThread); 902 #ifdef PROC_FS_JFS 903 jfs_proc_clean(); 904 #endif 905 unregister_filesystem(&jfs_fs_type); 906 kmem_cache_destroy(jfs_inode_cachep); 907 } 908 909 module_init(init_jfs_fs) 910 module_exit(exit_jfs_fs) 911