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 <asm/uaccess.h> 34 #include <linux/seq_file.h> 35 #include <linux/smp_lock.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_destroy_inode(struct inode *inode) 119 { 120 struct jfs_inode_info *ji = JFS_IP(inode); 121 122 BUG_ON(!list_empty(&ji->anon_inode_list)); 123 124 spin_lock_irq(&ji->ag_lock); 125 if (ji->active_ag != -1) { 126 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap; 127 atomic_dec(&bmap->db_active[ji->active_ag]); 128 ji->active_ag = -1; 129 } 130 spin_unlock_irq(&ji->ag_lock); 131 kmem_cache_free(jfs_inode_cachep, ji); 132 } 133 134 static void jfs_clear_inode(struct inode *inode) 135 { 136 vfs_dq_drop(inode); 137 } 138 139 static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf) 140 { 141 struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb); 142 s64 maxinodes; 143 struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap; 144 145 jfs_info("In jfs_statfs"); 146 buf->f_type = JFS_SUPER_MAGIC; 147 buf->f_bsize = sbi->bsize; 148 buf->f_blocks = sbi->bmap->db_mapsize; 149 buf->f_bfree = sbi->bmap->db_nfree; 150 buf->f_bavail = sbi->bmap->db_nfree; 151 /* 152 * If we really return the number of allocated & free inodes, some 153 * applications will fail because they won't see enough free inodes. 154 * We'll try to calculate some guess as to how may inodes we can 155 * really allocate 156 * 157 * buf->f_files = atomic_read(&imap->im_numinos); 158 * buf->f_ffree = atomic_read(&imap->im_numfree); 159 */ 160 maxinodes = min((s64) atomic_read(&imap->im_numinos) + 161 ((sbi->bmap->db_nfree >> imap->im_l2nbperiext) 162 << L2INOSPEREXT), (s64) 0xffffffffLL); 163 buf->f_files = maxinodes; 164 buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) - 165 atomic_read(&imap->im_numfree)); 166 buf->f_fsid.val[0] = (u32)crc32_le(0, sbi->uuid, sizeof(sbi->uuid)/2); 167 buf->f_fsid.val[1] = (u32)crc32_le(0, sbi->uuid + sizeof(sbi->uuid)/2, 168 sizeof(sbi->uuid)/2); 169 170 buf->f_namelen = JFS_NAME_MAX; 171 return 0; 172 } 173 174 static void jfs_put_super(struct super_block *sb) 175 { 176 struct jfs_sb_info *sbi = JFS_SBI(sb); 177 int rc; 178 179 jfs_info("In jfs_put_super"); 180 181 lock_kernel(); 182 183 rc = jfs_umount(sb); 184 if (rc) 185 jfs_err("jfs_umount failed with return code %d", rc); 186 187 unload_nls(sbi->nls_tab); 188 189 truncate_inode_pages(sbi->direct_inode->i_mapping, 0); 190 iput(sbi->direct_inode); 191 192 kfree(sbi); 193 194 unlock_kernel(); 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 lock_kernel(); 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 unlock_kernel(); 380 return -EROFS; 381 } 382 rc = jfs_extendfs(sb, newLVSize, 0); 383 if (rc) { 384 unlock_kernel(); 385 return rc; 386 } 387 } 388 389 if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) { 390 /* 391 * Invalidate any previously read metadata. fsck may have 392 * changed the on-disk data since we mounted r/o 393 */ 394 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0); 395 396 JFS_SBI(sb)->flag = flag; 397 ret = jfs_mount_rw(sb, 1); 398 unlock_kernel(); 399 return ret; 400 } 401 if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) { 402 rc = jfs_umount_rw(sb); 403 JFS_SBI(sb)->flag = flag; 404 unlock_kernel(); 405 return rc; 406 } 407 if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY)) 408 if (!(sb->s_flags & MS_RDONLY)) { 409 rc = jfs_umount_rw(sb); 410 if (rc) { 411 unlock_kernel(); 412 return rc; 413 } 414 JFS_SBI(sb)->flag = flag; 415 ret = jfs_mount_rw(sb, 1); 416 unlock_kernel(); 417 return ret; 418 } 419 JFS_SBI(sb)->flag = flag; 420 421 unlock_kernel(); 422 return 0; 423 } 424 425 static int jfs_fill_super(struct super_block *sb, void *data, int silent) 426 { 427 struct jfs_sb_info *sbi; 428 struct inode *inode; 429 int rc; 430 s64 newLVSize = 0; 431 int flag, ret = -EINVAL; 432 433 jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags); 434 435 if (!new_valid_dev(sb->s_bdev->bd_dev)) 436 return -EOVERFLOW; 437 438 sbi = kzalloc(sizeof (struct jfs_sb_info), GFP_KERNEL); 439 if (!sbi) 440 return -ENOMEM; 441 sb->s_fs_info = sbi; 442 sbi->sb = sb; 443 sbi->uid = sbi->gid = sbi->umask = -1; 444 445 /* initialize the mount flag and determine the default error handler */ 446 flag = JFS_ERR_REMOUNT_RO; 447 448 if (!parse_options((char *) data, sb, &newLVSize, &flag)) { 449 kfree(sbi); 450 return -EINVAL; 451 } 452 sbi->flag = flag; 453 454 #ifdef CONFIG_JFS_POSIX_ACL 455 sb->s_flags |= MS_POSIXACL; 456 #endif 457 458 if (newLVSize) { 459 printk(KERN_ERR "resize option for remount only\n"); 460 return -EINVAL; 461 } 462 463 /* 464 * Initialize blocksize to 4K. 465 */ 466 sb_set_blocksize(sb, PSIZE); 467 468 /* 469 * Set method vectors. 470 */ 471 sb->s_op = &jfs_super_operations; 472 sb->s_export_op = &jfs_export_operations; 473 474 /* 475 * Initialize direct-mapping inode/address-space 476 */ 477 inode = new_inode(sb); 478 if (inode == NULL) { 479 ret = -ENOMEM; 480 goto out_kfree; 481 } 482 inode->i_ino = 0; 483 inode->i_nlink = 1; 484 inode->i_size = sb->s_bdev->bd_inode->i_size; 485 inode->i_mapping->a_ops = &jfs_metapage_aops; 486 insert_inode_hash(inode); 487 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS); 488 489 sbi->direct_inode = inode; 490 491 rc = jfs_mount(sb); 492 if (rc) { 493 if (!silent) { 494 jfs_err("jfs_mount failed w/return code = %d", rc); 495 } 496 goto out_mount_failed; 497 } 498 if (sb->s_flags & MS_RDONLY) 499 sbi->log = NULL; 500 else { 501 rc = jfs_mount_rw(sb, 0); 502 if (rc) { 503 if (!silent) { 504 jfs_err("jfs_mount_rw failed, return code = %d", 505 rc); 506 } 507 goto out_no_rw; 508 } 509 } 510 511 sb->s_magic = JFS_SUPER_MAGIC; 512 513 inode = jfs_iget(sb, ROOT_I); 514 if (IS_ERR(inode)) { 515 ret = PTR_ERR(inode); 516 goto out_no_rw; 517 } 518 sb->s_root = d_alloc_root(inode); 519 if (!sb->s_root) 520 goto out_no_root; 521 522 if (sbi->mntflag & JFS_OS2) 523 sb->s_root->d_op = &jfs_ci_dentry_operations; 524 525 /* logical blocks are represented by 40 bits in pxd_t, etc. */ 526 sb->s_maxbytes = ((u64) sb->s_blocksize) << 40; 527 #if BITS_PER_LONG == 32 528 /* 529 * Page cache is indexed by long. 530 * I would use MAX_LFS_FILESIZE, but it's only half as big 531 */ 532 sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, (u64)sb->s_maxbytes); 533 #endif 534 sb->s_time_gran = 1; 535 return 0; 536 537 out_no_root: 538 jfs_err("jfs_read_super: get root dentry failed"); 539 iput(inode); 540 541 out_no_rw: 542 rc = jfs_umount(sb); 543 if (rc) { 544 jfs_err("jfs_umount failed with return code %d", rc); 545 } 546 out_mount_failed: 547 filemap_write_and_wait(sbi->direct_inode->i_mapping); 548 truncate_inode_pages(sbi->direct_inode->i_mapping, 0); 549 make_bad_inode(sbi->direct_inode); 550 iput(sbi->direct_inode); 551 sbi->direct_inode = NULL; 552 out_kfree: 553 if (sbi->nls_tab) 554 unload_nls(sbi->nls_tab); 555 kfree(sbi); 556 return ret; 557 } 558 559 static int jfs_freeze(struct super_block *sb) 560 { 561 struct jfs_sb_info *sbi = JFS_SBI(sb); 562 struct jfs_log *log = sbi->log; 563 564 if (!(sb->s_flags & MS_RDONLY)) { 565 txQuiesce(sb); 566 lmLogShutdown(log); 567 updateSuper(sb, FM_CLEAN); 568 } 569 return 0; 570 } 571 572 static int jfs_unfreeze(struct super_block *sb) 573 { 574 struct jfs_sb_info *sbi = JFS_SBI(sb); 575 struct jfs_log *log = sbi->log; 576 int rc = 0; 577 578 if (!(sb->s_flags & MS_RDONLY)) { 579 updateSuper(sb, FM_MOUNT); 580 if ((rc = lmLogInit(log))) 581 jfs_err("jfs_unlock failed with return code %d", rc); 582 else 583 txResume(sb); 584 } 585 return 0; 586 } 587 588 static int jfs_get_sb(struct file_system_type *fs_type, 589 int flags, const char *dev_name, void *data, struct vfsmount *mnt) 590 { 591 return get_sb_bdev(fs_type, flags, dev_name, data, jfs_fill_super, 592 mnt); 593 } 594 595 static int jfs_sync_fs(struct super_block *sb, int wait) 596 { 597 struct jfs_log *log = JFS_SBI(sb)->log; 598 599 /* log == NULL indicates read-only mount */ 600 if (log) { 601 jfs_flush_journal(log, wait); 602 jfs_syncpt(log, 0); 603 } 604 605 return 0; 606 } 607 608 static int jfs_show_options(struct seq_file *seq, struct vfsmount *vfs) 609 { 610 struct jfs_sb_info *sbi = JFS_SBI(vfs->mnt_sb); 611 612 if (sbi->uid != -1) 613 seq_printf(seq, ",uid=%d", sbi->uid); 614 if (sbi->gid != -1) 615 seq_printf(seq, ",gid=%d", sbi->gid); 616 if (sbi->umask != -1) 617 seq_printf(seq, ",umask=%03o", sbi->umask); 618 if (sbi->flag & JFS_NOINTEGRITY) 619 seq_puts(seq, ",nointegrity"); 620 if (sbi->nls_tab) 621 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset); 622 if (sbi->flag & JFS_ERR_CONTINUE) 623 seq_printf(seq, ",errors=continue"); 624 if (sbi->flag & JFS_ERR_PANIC) 625 seq_printf(seq, ",errors=panic"); 626 627 #ifdef CONFIG_QUOTA 628 if (sbi->flag & JFS_USRQUOTA) 629 seq_puts(seq, ",usrquota"); 630 631 if (sbi->flag & JFS_GRPQUOTA) 632 seq_puts(seq, ",grpquota"); 633 #endif 634 635 return 0; 636 } 637 638 #ifdef CONFIG_QUOTA 639 640 /* Read data from quotafile - avoid pagecache and such because we cannot afford 641 * acquiring the locks... As quota files are never truncated and quota code 642 * itself serializes the operations (and noone else should touch the files) 643 * we don't have to be afraid of races */ 644 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data, 645 size_t len, loff_t off) 646 { 647 struct inode *inode = sb_dqopt(sb)->files[type]; 648 sector_t blk = off >> sb->s_blocksize_bits; 649 int err = 0; 650 int offset = off & (sb->s_blocksize - 1); 651 int tocopy; 652 size_t toread; 653 struct buffer_head tmp_bh; 654 struct buffer_head *bh; 655 loff_t i_size = i_size_read(inode); 656 657 if (off > i_size) 658 return 0; 659 if (off+len > i_size) 660 len = i_size-off; 661 toread = len; 662 while (toread > 0) { 663 tocopy = sb->s_blocksize - offset < toread ? 664 sb->s_blocksize - offset : toread; 665 666 tmp_bh.b_state = 0; 667 tmp_bh.b_size = 1 << inode->i_blkbits; 668 err = jfs_get_block(inode, blk, &tmp_bh, 0); 669 if (err) 670 return err; 671 if (!buffer_mapped(&tmp_bh)) /* A hole? */ 672 memset(data, 0, tocopy); 673 else { 674 bh = sb_bread(sb, tmp_bh.b_blocknr); 675 if (!bh) 676 return -EIO; 677 memcpy(data, bh->b_data+offset, tocopy); 678 brelse(bh); 679 } 680 offset = 0; 681 toread -= tocopy; 682 data += tocopy; 683 blk++; 684 } 685 return len; 686 } 687 688 /* Write to quotafile */ 689 static ssize_t jfs_quota_write(struct super_block *sb, int type, 690 const char *data, size_t len, loff_t off) 691 { 692 struct inode *inode = sb_dqopt(sb)->files[type]; 693 sector_t blk = off >> sb->s_blocksize_bits; 694 int err = 0; 695 int offset = off & (sb->s_blocksize - 1); 696 int tocopy; 697 size_t towrite = len; 698 struct buffer_head tmp_bh; 699 struct buffer_head *bh; 700 701 mutex_lock(&inode->i_mutex); 702 while (towrite > 0) { 703 tocopy = sb->s_blocksize - offset < towrite ? 704 sb->s_blocksize - offset : towrite; 705 706 tmp_bh.b_state = 0; 707 tmp_bh.b_size = 1 << inode->i_blkbits; 708 err = jfs_get_block(inode, blk, &tmp_bh, 1); 709 if (err) 710 goto out; 711 if (offset || tocopy != sb->s_blocksize) 712 bh = sb_bread(sb, tmp_bh.b_blocknr); 713 else 714 bh = sb_getblk(sb, tmp_bh.b_blocknr); 715 if (!bh) { 716 err = -EIO; 717 goto out; 718 } 719 lock_buffer(bh); 720 memcpy(bh->b_data+offset, data, tocopy); 721 flush_dcache_page(bh->b_page); 722 set_buffer_uptodate(bh); 723 mark_buffer_dirty(bh); 724 unlock_buffer(bh); 725 brelse(bh); 726 offset = 0; 727 towrite -= tocopy; 728 data += tocopy; 729 blk++; 730 } 731 out: 732 if (len == towrite) { 733 mutex_unlock(&inode->i_mutex); 734 return err; 735 } 736 if (inode->i_size < off+len-towrite) 737 i_size_write(inode, off+len-towrite); 738 inode->i_version++; 739 inode->i_mtime = inode->i_ctime = CURRENT_TIME; 740 mark_inode_dirty(inode); 741 mutex_unlock(&inode->i_mutex); 742 return len - towrite; 743 } 744 745 #endif 746 747 static const struct super_operations jfs_super_operations = { 748 .alloc_inode = jfs_alloc_inode, 749 .destroy_inode = jfs_destroy_inode, 750 .dirty_inode = jfs_dirty_inode, 751 .write_inode = jfs_write_inode, 752 .delete_inode = jfs_delete_inode, 753 .clear_inode = jfs_clear_inode, 754 .put_super = jfs_put_super, 755 .sync_fs = jfs_sync_fs, 756 .freeze_fs = jfs_freeze, 757 .unfreeze_fs = jfs_unfreeze, 758 .statfs = jfs_statfs, 759 .remount_fs = jfs_remount, 760 .show_options = jfs_show_options, 761 #ifdef CONFIG_QUOTA 762 .quota_read = jfs_quota_read, 763 .quota_write = jfs_quota_write, 764 #endif 765 }; 766 767 static const struct export_operations jfs_export_operations = { 768 .fh_to_dentry = jfs_fh_to_dentry, 769 .fh_to_parent = jfs_fh_to_parent, 770 .get_parent = jfs_get_parent, 771 }; 772 773 static struct file_system_type jfs_fs_type = { 774 .owner = THIS_MODULE, 775 .name = "jfs", 776 .get_sb = jfs_get_sb, 777 .kill_sb = kill_block_super, 778 .fs_flags = FS_REQUIRES_DEV, 779 }; 780 781 static void init_once(void *foo) 782 { 783 struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo; 784 785 memset(jfs_ip, 0, sizeof(struct jfs_inode_info)); 786 INIT_LIST_HEAD(&jfs_ip->anon_inode_list); 787 init_rwsem(&jfs_ip->rdwrlock); 788 mutex_init(&jfs_ip->commit_mutex); 789 init_rwsem(&jfs_ip->xattr_sem); 790 spin_lock_init(&jfs_ip->ag_lock); 791 jfs_ip->active_ag = -1; 792 inode_init_once(&jfs_ip->vfs_inode); 793 } 794 795 static int __init init_jfs_fs(void) 796 { 797 int i; 798 int rc; 799 800 jfs_inode_cachep = 801 kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0, 802 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, 803 init_once); 804 if (jfs_inode_cachep == NULL) 805 return -ENOMEM; 806 807 /* 808 * Metapage initialization 809 */ 810 rc = metapage_init(); 811 if (rc) { 812 jfs_err("metapage_init failed w/rc = %d", rc); 813 goto free_slab; 814 } 815 816 /* 817 * Transaction Manager initialization 818 */ 819 rc = txInit(); 820 if (rc) { 821 jfs_err("txInit failed w/rc = %d", rc); 822 goto free_metapage; 823 } 824 825 /* 826 * I/O completion thread (endio) 827 */ 828 jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO"); 829 if (IS_ERR(jfsIOthread)) { 830 rc = PTR_ERR(jfsIOthread); 831 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 832 goto end_txmngr; 833 } 834 835 if (commit_threads < 1) 836 commit_threads = num_online_cpus(); 837 if (commit_threads > MAX_COMMIT_THREADS) 838 commit_threads = MAX_COMMIT_THREADS; 839 840 for (i = 0; i < commit_threads; i++) { 841 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, "jfsCommit"); 842 if (IS_ERR(jfsCommitThread[i])) { 843 rc = PTR_ERR(jfsCommitThread[i]); 844 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 845 commit_threads = i; 846 goto kill_committask; 847 } 848 } 849 850 jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync"); 851 if (IS_ERR(jfsSyncThread)) { 852 rc = PTR_ERR(jfsSyncThread); 853 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 854 goto kill_committask; 855 } 856 857 #ifdef PROC_FS_JFS 858 jfs_proc_init(); 859 #endif 860 861 return register_filesystem(&jfs_fs_type); 862 863 kill_committask: 864 for (i = 0; i < commit_threads; i++) 865 kthread_stop(jfsCommitThread[i]); 866 kthread_stop(jfsIOthread); 867 end_txmngr: 868 txExit(); 869 free_metapage: 870 metapage_exit(); 871 free_slab: 872 kmem_cache_destroy(jfs_inode_cachep); 873 return rc; 874 } 875 876 static void __exit exit_jfs_fs(void) 877 { 878 int i; 879 880 jfs_info("exit_jfs_fs called"); 881 882 txExit(); 883 metapage_exit(); 884 885 kthread_stop(jfsIOthread); 886 for (i = 0; i < commit_threads; i++) 887 kthread_stop(jfsCommitThread[i]); 888 kthread_stop(jfsSyncThread); 889 #ifdef PROC_FS_JFS 890 jfs_proc_clean(); 891 #endif 892 unregister_filesystem(&jfs_fs_type); 893 kmem_cache_destroy(jfs_inode_cachep); 894 } 895 896 module_init(init_jfs_fs) 897 module_exit(exit_jfs_fs) 898