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/mount.h> 26 #include <linux/moduleparam.h> 27 #include <linux/kthread.h> 28 #include <linux/posix_acl.h> 29 #include <linux/buffer_head.h> 30 #include <linux/exportfs.h> 31 #include <asm/uaccess.h> 32 #include <linux/seq_file.h> 33 34 #include "jfs_incore.h" 35 #include "jfs_filsys.h" 36 #include "jfs_inode.h" 37 #include "jfs_metapage.h" 38 #include "jfs_superblock.h" 39 #include "jfs_dmap.h" 40 #include "jfs_imap.h" 41 #include "jfs_acl.h" 42 #include "jfs_debug.h" 43 44 MODULE_DESCRIPTION("The Journaled Filesystem (JFS)"); 45 MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM"); 46 MODULE_LICENSE("GPL"); 47 48 static struct kmem_cache * jfs_inode_cachep; 49 50 static const struct super_operations jfs_super_operations; 51 static struct export_operations jfs_export_operations; 52 static struct file_system_type jfs_fs_type; 53 54 #define MAX_COMMIT_THREADS 64 55 static int commit_threads = 0; 56 module_param(commit_threads, int, 0); 57 MODULE_PARM_DESC(commit_threads, "Number of commit threads"); 58 59 static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS]; 60 struct task_struct *jfsIOthread; 61 struct task_struct *jfsSyncThread; 62 63 #ifdef CONFIG_JFS_DEBUG 64 int jfsloglevel = JFS_LOGLEVEL_WARN; 65 module_param(jfsloglevel, int, 0644); 66 MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)"); 67 #endif 68 69 static void jfs_handle_error(struct super_block *sb) 70 { 71 struct jfs_sb_info *sbi = JFS_SBI(sb); 72 73 if (sb->s_flags & MS_RDONLY) 74 return; 75 76 updateSuper(sb, FM_DIRTY); 77 78 if (sbi->flag & JFS_ERR_PANIC) 79 panic("JFS (device %s): panic forced after error\n", 80 sb->s_id); 81 else if (sbi->flag & JFS_ERR_REMOUNT_RO) { 82 jfs_err("ERROR: (device %s): remounting filesystem " 83 "as read-only\n", 84 sb->s_id); 85 sb->s_flags |= MS_RDONLY; 86 } 87 88 /* nothing is done for continue beyond marking the superblock dirty */ 89 } 90 91 void jfs_error(struct super_block *sb, const char * function, ...) 92 { 93 static char error_buf[256]; 94 va_list args; 95 96 va_start(args, function); 97 vsnprintf(error_buf, sizeof(error_buf), function, args); 98 va_end(args); 99 100 printk(KERN_ERR "ERROR: (device %s): %s\n", sb->s_id, error_buf); 101 102 jfs_handle_error(sb); 103 } 104 105 static struct inode *jfs_alloc_inode(struct super_block *sb) 106 { 107 struct jfs_inode_info *jfs_inode; 108 109 jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS); 110 if (!jfs_inode) 111 return NULL; 112 return &jfs_inode->vfs_inode; 113 } 114 115 static void jfs_destroy_inode(struct inode *inode) 116 { 117 struct jfs_inode_info *ji = JFS_IP(inode); 118 119 BUG_ON(!list_empty(&ji->anon_inode_list)); 120 121 spin_lock_irq(&ji->ag_lock); 122 if (ji->active_ag != -1) { 123 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap; 124 atomic_dec(&bmap->db_active[ji->active_ag]); 125 ji->active_ag = -1; 126 } 127 spin_unlock_irq(&ji->ag_lock); 128 129 #ifdef CONFIG_JFS_POSIX_ACL 130 if (ji->i_acl != JFS_ACL_NOT_CACHED) { 131 posix_acl_release(ji->i_acl); 132 ji->i_acl = JFS_ACL_NOT_CACHED; 133 } 134 if (ji->i_default_acl != JFS_ACL_NOT_CACHED) { 135 posix_acl_release(ji->i_default_acl); 136 ji->i_default_acl = JFS_ACL_NOT_CACHED; 137 } 138 #endif 139 140 kmem_cache_free(jfs_inode_cachep, ji); 141 } 142 143 static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf) 144 { 145 struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb); 146 s64 maxinodes; 147 struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap; 148 149 jfs_info("In jfs_statfs"); 150 buf->f_type = JFS_SUPER_MAGIC; 151 buf->f_bsize = sbi->bsize; 152 buf->f_blocks = sbi->bmap->db_mapsize; 153 buf->f_bfree = sbi->bmap->db_nfree; 154 buf->f_bavail = sbi->bmap->db_nfree; 155 /* 156 * If we really return the number of allocated & free inodes, some 157 * applications will fail because they won't see enough free inodes. 158 * We'll try to calculate some guess as to how may inodes we can 159 * really allocate 160 * 161 * buf->f_files = atomic_read(&imap->im_numinos); 162 * buf->f_ffree = atomic_read(&imap->im_numfree); 163 */ 164 maxinodes = min((s64) atomic_read(&imap->im_numinos) + 165 ((sbi->bmap->db_nfree >> imap->im_l2nbperiext) 166 << L2INOSPEREXT), (s64) 0xffffffffLL); 167 buf->f_files = maxinodes; 168 buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) - 169 atomic_read(&imap->im_numfree)); 170 171 buf->f_namelen = JFS_NAME_MAX; 172 return 0; 173 } 174 175 static void jfs_put_super(struct super_block *sb) 176 { 177 struct jfs_sb_info *sbi = JFS_SBI(sb); 178 int rc; 179 180 jfs_info("In jfs_put_super"); 181 rc = jfs_umount(sb); 182 if (rc) 183 jfs_err("jfs_umount failed with return code %d", rc); 184 if (sbi->nls_tab) 185 unload_nls(sbi->nls_tab); 186 sbi->nls_tab = NULL; 187 188 truncate_inode_pages(sbi->direct_inode->i_mapping, 0); 189 iput(sbi->direct_inode); 190 sbi->direct_inode = NULL; 191 192 kfree(sbi); 193 } 194 195 enum { 196 Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize, 197 Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota, 198 Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask 199 }; 200 201 static match_table_t tokens = { 202 {Opt_integrity, "integrity"}, 203 {Opt_nointegrity, "nointegrity"}, 204 {Opt_iocharset, "iocharset=%s"}, 205 {Opt_resize, "resize=%u"}, 206 {Opt_resize_nosize, "resize"}, 207 {Opt_errors, "errors=%s"}, 208 {Opt_ignore, "noquota"}, 209 {Opt_ignore, "quota"}, 210 {Opt_usrquota, "usrquota"}, 211 {Opt_grpquota, "grpquota"}, 212 {Opt_uid, "uid=%u"}, 213 {Opt_gid, "gid=%u"}, 214 {Opt_umask, "umask=%u"}, 215 {Opt_err, NULL} 216 }; 217 218 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize, 219 int *flag) 220 { 221 void *nls_map = (void *)-1; /* -1: no change; NULL: none */ 222 char *p; 223 struct jfs_sb_info *sbi = JFS_SBI(sb); 224 225 *newLVSize = 0; 226 227 if (!options) 228 return 1; 229 230 while ((p = strsep(&options, ",")) != NULL) { 231 substring_t args[MAX_OPT_ARGS]; 232 int token; 233 if (!*p) 234 continue; 235 236 token = match_token(p, tokens, args); 237 switch (token) { 238 case Opt_integrity: 239 *flag &= ~JFS_NOINTEGRITY; 240 break; 241 case Opt_nointegrity: 242 *flag |= JFS_NOINTEGRITY; 243 break; 244 case Opt_ignore: 245 /* Silently ignore the quota options */ 246 /* Don't do anything ;-) */ 247 break; 248 case Opt_iocharset: 249 if (nls_map && nls_map != (void *) -1) 250 unload_nls(nls_map); 251 if (!strcmp(args[0].from, "none")) 252 nls_map = NULL; 253 else { 254 nls_map = load_nls(args[0].from); 255 if (!nls_map) { 256 printk(KERN_ERR 257 "JFS: charset not found\n"); 258 goto cleanup; 259 } 260 } 261 break; 262 case Opt_resize: 263 { 264 char *resize = args[0].from; 265 *newLVSize = simple_strtoull(resize, &resize, 0); 266 break; 267 } 268 case Opt_resize_nosize: 269 { 270 *newLVSize = sb->s_bdev->bd_inode->i_size >> 271 sb->s_blocksize_bits; 272 if (*newLVSize == 0) 273 printk(KERN_ERR 274 "JFS: Cannot determine volume size\n"); 275 break; 276 } 277 case Opt_errors: 278 { 279 char *errors = args[0].from; 280 if (!errors || !*errors) 281 goto cleanup; 282 if (!strcmp(errors, "continue")) { 283 *flag &= ~JFS_ERR_REMOUNT_RO; 284 *flag &= ~JFS_ERR_PANIC; 285 *flag |= JFS_ERR_CONTINUE; 286 } else if (!strcmp(errors, "remount-ro")) { 287 *flag &= ~JFS_ERR_CONTINUE; 288 *flag &= ~JFS_ERR_PANIC; 289 *flag |= JFS_ERR_REMOUNT_RO; 290 } else if (!strcmp(errors, "panic")) { 291 *flag &= ~JFS_ERR_CONTINUE; 292 *flag &= ~JFS_ERR_REMOUNT_RO; 293 *flag |= JFS_ERR_PANIC; 294 } else { 295 printk(KERN_ERR 296 "JFS: %s is an invalid error handler\n", 297 errors); 298 goto cleanup; 299 } 300 break; 301 } 302 303 #ifdef CONFIG_QUOTA 304 case Opt_quota: 305 case Opt_usrquota: 306 *flag |= JFS_USRQUOTA; 307 break; 308 case Opt_grpquota: 309 *flag |= JFS_GRPQUOTA; 310 break; 311 #else 312 case Opt_usrquota: 313 case Opt_grpquota: 314 case Opt_quota: 315 printk(KERN_ERR 316 "JFS: quota operations not supported\n"); 317 break; 318 #endif 319 case Opt_uid: 320 { 321 char *uid = args[0].from; 322 sbi->uid = simple_strtoul(uid, &uid, 0); 323 break; 324 } 325 case Opt_gid: 326 { 327 char *gid = args[0].from; 328 sbi->gid = simple_strtoul(gid, &gid, 0); 329 break; 330 } 331 case Opt_umask: 332 { 333 char *umask = args[0].from; 334 sbi->umask = simple_strtoul(umask, &umask, 8); 335 if (sbi->umask & ~0777) { 336 printk(KERN_ERR 337 "JFS: Invalid value of umask\n"); 338 goto cleanup; 339 } 340 break; 341 } 342 default: 343 printk("jfs: Unrecognized mount option \"%s\" " 344 " or missing value\n", p); 345 goto cleanup; 346 } 347 } 348 349 if (nls_map != (void *) -1) { 350 /* Discard old (if remount) */ 351 if (sbi->nls_tab) 352 unload_nls(sbi->nls_tab); 353 sbi->nls_tab = nls_map; 354 } 355 return 1; 356 357 cleanup: 358 if (nls_map && nls_map != (void *) -1) 359 unload_nls(nls_map); 360 return 0; 361 } 362 363 static int jfs_remount(struct super_block *sb, int *flags, char *data) 364 { 365 s64 newLVSize = 0; 366 int rc = 0; 367 int flag = JFS_SBI(sb)->flag; 368 369 if (!parse_options(data, sb, &newLVSize, &flag)) { 370 return -EINVAL; 371 } 372 if (newLVSize) { 373 if (sb->s_flags & MS_RDONLY) { 374 printk(KERN_ERR 375 "JFS: resize requires volume to be mounted read-write\n"); 376 return -EROFS; 377 } 378 rc = jfs_extendfs(sb, newLVSize, 0); 379 if (rc) 380 return rc; 381 } 382 383 if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) { 384 /* 385 * Invalidate any previously read metadata. fsck may have 386 * changed the on-disk data since we mounted r/o 387 */ 388 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0); 389 390 JFS_SBI(sb)->flag = flag; 391 return jfs_mount_rw(sb, 1); 392 } 393 if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) { 394 rc = jfs_umount_rw(sb); 395 JFS_SBI(sb)->flag = flag; 396 return rc; 397 } 398 if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY)) 399 if (!(sb->s_flags & MS_RDONLY)) { 400 rc = jfs_umount_rw(sb); 401 if (rc) 402 return rc; 403 JFS_SBI(sb)->flag = flag; 404 return jfs_mount_rw(sb, 1); 405 } 406 JFS_SBI(sb)->flag = flag; 407 408 return 0; 409 } 410 411 static int jfs_fill_super(struct super_block *sb, void *data, int silent) 412 { 413 struct jfs_sb_info *sbi; 414 struct inode *inode; 415 int rc; 416 s64 newLVSize = 0; 417 int flag; 418 419 jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags); 420 421 if (!new_valid_dev(sb->s_bdev->bd_dev)) 422 return -EOVERFLOW; 423 424 sbi = kzalloc(sizeof (struct jfs_sb_info), GFP_KERNEL); 425 if (!sbi) 426 return -ENOMEM; 427 sb->s_fs_info = sbi; 428 sbi->sb = sb; 429 sbi->uid = sbi->gid = sbi->umask = -1; 430 431 /* initialize the mount flag and determine the default error handler */ 432 flag = JFS_ERR_REMOUNT_RO; 433 434 if (!parse_options((char *) data, sb, &newLVSize, &flag)) { 435 kfree(sbi); 436 return -EINVAL; 437 } 438 sbi->flag = flag; 439 440 #ifdef CONFIG_JFS_POSIX_ACL 441 sb->s_flags |= MS_POSIXACL; 442 #endif 443 444 if (newLVSize) { 445 printk(KERN_ERR "resize option for remount only\n"); 446 return -EINVAL; 447 } 448 449 /* 450 * Initialize blocksize to 4K. 451 */ 452 sb_set_blocksize(sb, PSIZE); 453 454 /* 455 * Set method vectors. 456 */ 457 sb->s_op = &jfs_super_operations; 458 sb->s_export_op = &jfs_export_operations; 459 460 /* 461 * Initialize direct-mapping inode/address-space 462 */ 463 inode = new_inode(sb); 464 if (inode == NULL) 465 goto out_kfree; 466 inode->i_ino = 0; 467 inode->i_nlink = 1; 468 inode->i_size = sb->s_bdev->bd_inode->i_size; 469 inode->i_mapping->a_ops = &jfs_metapage_aops; 470 insert_inode_hash(inode); 471 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS); 472 473 sbi->direct_inode = inode; 474 475 rc = jfs_mount(sb); 476 if (rc) { 477 if (!silent) { 478 jfs_err("jfs_mount failed w/return code = %d", rc); 479 } 480 goto out_mount_failed; 481 } 482 if (sb->s_flags & MS_RDONLY) 483 sbi->log = NULL; 484 else { 485 rc = jfs_mount_rw(sb, 0); 486 if (rc) { 487 if (!silent) { 488 jfs_err("jfs_mount_rw failed, return code = %d", 489 rc); 490 } 491 goto out_no_rw; 492 } 493 } 494 495 sb->s_magic = JFS_SUPER_MAGIC; 496 497 inode = iget(sb, ROOT_I); 498 if (!inode || is_bad_inode(inode)) 499 goto out_no_root; 500 sb->s_root = d_alloc_root(inode); 501 if (!sb->s_root) 502 goto out_no_root; 503 504 if (sbi->mntflag & JFS_OS2) 505 sb->s_root->d_op = &jfs_ci_dentry_operations; 506 507 /* logical blocks are represented by 40 bits in pxd_t, etc. */ 508 sb->s_maxbytes = ((u64) sb->s_blocksize) << 40; 509 #if BITS_PER_LONG == 32 510 /* 511 * Page cache is indexed by long. 512 * I would use MAX_LFS_FILESIZE, but it's only half as big 513 */ 514 sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, sb->s_maxbytes); 515 #endif 516 sb->s_time_gran = 1; 517 return 0; 518 519 out_no_root: 520 jfs_err("jfs_read_super: get root inode failed"); 521 if (inode) 522 iput(inode); 523 524 out_no_rw: 525 rc = jfs_umount(sb); 526 if (rc) { 527 jfs_err("jfs_umount failed with return code %d", rc); 528 } 529 out_mount_failed: 530 filemap_write_and_wait(sbi->direct_inode->i_mapping); 531 truncate_inode_pages(sbi->direct_inode->i_mapping, 0); 532 make_bad_inode(sbi->direct_inode); 533 iput(sbi->direct_inode); 534 sbi->direct_inode = NULL; 535 out_kfree: 536 if (sbi->nls_tab) 537 unload_nls(sbi->nls_tab); 538 kfree(sbi); 539 return -EINVAL; 540 } 541 542 static void jfs_write_super_lockfs(struct super_block *sb) 543 { 544 struct jfs_sb_info *sbi = JFS_SBI(sb); 545 struct jfs_log *log = sbi->log; 546 547 if (!(sb->s_flags & MS_RDONLY)) { 548 txQuiesce(sb); 549 lmLogShutdown(log); 550 updateSuper(sb, FM_CLEAN); 551 } 552 } 553 554 static void jfs_unlockfs(struct super_block *sb) 555 { 556 struct jfs_sb_info *sbi = JFS_SBI(sb); 557 struct jfs_log *log = sbi->log; 558 int rc = 0; 559 560 if (!(sb->s_flags & MS_RDONLY)) { 561 updateSuper(sb, FM_MOUNT); 562 if ((rc = lmLogInit(log))) 563 jfs_err("jfs_unlock failed with return code %d", rc); 564 else 565 txResume(sb); 566 } 567 } 568 569 static int jfs_get_sb(struct file_system_type *fs_type, 570 int flags, const char *dev_name, void *data, struct vfsmount *mnt) 571 { 572 return get_sb_bdev(fs_type, flags, dev_name, data, jfs_fill_super, 573 mnt); 574 } 575 576 static int jfs_sync_fs(struct super_block *sb, int wait) 577 { 578 struct jfs_log *log = JFS_SBI(sb)->log; 579 580 /* log == NULL indicates read-only mount */ 581 if (log) { 582 jfs_flush_journal(log, wait); 583 jfs_syncpt(log, 0); 584 } 585 586 return 0; 587 } 588 589 static int jfs_show_options(struct seq_file *seq, struct vfsmount *vfs) 590 { 591 struct jfs_sb_info *sbi = JFS_SBI(vfs->mnt_sb); 592 593 if (sbi->uid != -1) 594 seq_printf(seq, ",uid=%d", sbi->uid); 595 if (sbi->gid != -1) 596 seq_printf(seq, ",gid=%d", sbi->gid); 597 if (sbi->umask != -1) 598 seq_printf(seq, ",umask=%03o", sbi->umask); 599 if (sbi->flag & JFS_NOINTEGRITY) 600 seq_puts(seq, ",nointegrity"); 601 602 #ifdef CONFIG_QUOTA 603 if (sbi->flag & JFS_USRQUOTA) 604 seq_puts(seq, ",usrquota"); 605 606 if (sbi->flag & JFS_GRPQUOTA) 607 seq_puts(seq, ",grpquota"); 608 #endif 609 610 return 0; 611 } 612 613 #ifdef CONFIG_QUOTA 614 615 /* Read data from quotafile - avoid pagecache and such because we cannot afford 616 * acquiring the locks... As quota files are never truncated and quota code 617 * itself serializes the operations (and noone else should touch the files) 618 * we don't have to be afraid of races */ 619 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data, 620 size_t len, loff_t off) 621 { 622 struct inode *inode = sb_dqopt(sb)->files[type]; 623 sector_t blk = off >> sb->s_blocksize_bits; 624 int err = 0; 625 int offset = off & (sb->s_blocksize - 1); 626 int tocopy; 627 size_t toread; 628 struct buffer_head tmp_bh; 629 struct buffer_head *bh; 630 loff_t i_size = i_size_read(inode); 631 632 if (off > i_size) 633 return 0; 634 if (off+len > i_size) 635 len = i_size-off; 636 toread = len; 637 while (toread > 0) { 638 tocopy = sb->s_blocksize - offset < toread ? 639 sb->s_blocksize - offset : toread; 640 641 tmp_bh.b_state = 0; 642 tmp_bh.b_size = 1 << inode->i_blkbits; 643 err = jfs_get_block(inode, blk, &tmp_bh, 0); 644 if (err) 645 return err; 646 if (!buffer_mapped(&tmp_bh)) /* A hole? */ 647 memset(data, 0, tocopy); 648 else { 649 bh = sb_bread(sb, tmp_bh.b_blocknr); 650 if (!bh) 651 return -EIO; 652 memcpy(data, bh->b_data+offset, tocopy); 653 brelse(bh); 654 } 655 offset = 0; 656 toread -= tocopy; 657 data += tocopy; 658 blk++; 659 } 660 return len; 661 } 662 663 /* Write to quotafile */ 664 static ssize_t jfs_quota_write(struct super_block *sb, int type, 665 const char *data, size_t len, loff_t off) 666 { 667 struct inode *inode = sb_dqopt(sb)->files[type]; 668 sector_t blk = off >> sb->s_blocksize_bits; 669 int err = 0; 670 int offset = off & (sb->s_blocksize - 1); 671 int tocopy; 672 size_t towrite = len; 673 struct buffer_head tmp_bh; 674 struct buffer_head *bh; 675 676 mutex_lock(&inode->i_mutex); 677 while (towrite > 0) { 678 tocopy = sb->s_blocksize - offset < towrite ? 679 sb->s_blocksize - offset : towrite; 680 681 tmp_bh.b_state = 0; 682 tmp_bh.b_size = 1 << inode->i_blkbits; 683 err = jfs_get_block(inode, blk, &tmp_bh, 1); 684 if (err) 685 goto out; 686 if (offset || tocopy != sb->s_blocksize) 687 bh = sb_bread(sb, tmp_bh.b_blocknr); 688 else 689 bh = sb_getblk(sb, tmp_bh.b_blocknr); 690 if (!bh) { 691 err = -EIO; 692 goto out; 693 } 694 lock_buffer(bh); 695 memcpy(bh->b_data+offset, data, tocopy); 696 flush_dcache_page(bh->b_page); 697 set_buffer_uptodate(bh); 698 mark_buffer_dirty(bh); 699 unlock_buffer(bh); 700 brelse(bh); 701 offset = 0; 702 towrite -= tocopy; 703 data += tocopy; 704 blk++; 705 } 706 out: 707 if (len == towrite) 708 return err; 709 if (inode->i_size < off+len-towrite) 710 i_size_write(inode, off+len-towrite); 711 inode->i_version++; 712 inode->i_mtime = inode->i_ctime = CURRENT_TIME; 713 mark_inode_dirty(inode); 714 mutex_unlock(&inode->i_mutex); 715 return len - towrite; 716 } 717 718 #endif 719 720 static const struct super_operations jfs_super_operations = { 721 .alloc_inode = jfs_alloc_inode, 722 .destroy_inode = jfs_destroy_inode, 723 .read_inode = jfs_read_inode, 724 .dirty_inode = jfs_dirty_inode, 725 .write_inode = jfs_write_inode, 726 .delete_inode = jfs_delete_inode, 727 .put_super = jfs_put_super, 728 .sync_fs = jfs_sync_fs, 729 .write_super_lockfs = jfs_write_super_lockfs, 730 .unlockfs = jfs_unlockfs, 731 .statfs = jfs_statfs, 732 .remount_fs = jfs_remount, 733 .show_options = jfs_show_options, 734 #ifdef CONFIG_QUOTA 735 .quota_read = jfs_quota_read, 736 .quota_write = jfs_quota_write, 737 #endif 738 }; 739 740 static struct export_operations jfs_export_operations = { 741 .get_dentry = jfs_get_dentry, 742 .get_parent = jfs_get_parent, 743 }; 744 745 static struct file_system_type jfs_fs_type = { 746 .owner = THIS_MODULE, 747 .name = "jfs", 748 .get_sb = jfs_get_sb, 749 .kill_sb = kill_block_super, 750 .fs_flags = FS_REQUIRES_DEV, 751 }; 752 753 static void init_once(void *foo, struct kmem_cache * cachep, unsigned long flags) 754 { 755 struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo; 756 757 memset(jfs_ip, 0, sizeof(struct jfs_inode_info)); 758 INIT_LIST_HEAD(&jfs_ip->anon_inode_list); 759 init_rwsem(&jfs_ip->rdwrlock); 760 mutex_init(&jfs_ip->commit_mutex); 761 init_rwsem(&jfs_ip->xattr_sem); 762 spin_lock_init(&jfs_ip->ag_lock); 763 jfs_ip->active_ag = -1; 764 #ifdef CONFIG_JFS_POSIX_ACL 765 jfs_ip->i_acl = JFS_ACL_NOT_CACHED; 766 jfs_ip->i_default_acl = JFS_ACL_NOT_CACHED; 767 #endif 768 inode_init_once(&jfs_ip->vfs_inode); 769 } 770 771 static int __init init_jfs_fs(void) 772 { 773 int i; 774 int rc; 775 776 jfs_inode_cachep = 777 kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0, 778 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, 779 init_once); 780 if (jfs_inode_cachep == NULL) 781 return -ENOMEM; 782 783 /* 784 * Metapage initialization 785 */ 786 rc = metapage_init(); 787 if (rc) { 788 jfs_err("metapage_init failed w/rc = %d", rc); 789 goto free_slab; 790 } 791 792 /* 793 * Transaction Manager initialization 794 */ 795 rc = txInit(); 796 if (rc) { 797 jfs_err("txInit failed w/rc = %d", rc); 798 goto free_metapage; 799 } 800 801 /* 802 * I/O completion thread (endio) 803 */ 804 jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO"); 805 if (IS_ERR(jfsIOthread)) { 806 rc = PTR_ERR(jfsIOthread); 807 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 808 goto end_txmngr; 809 } 810 811 if (commit_threads < 1) 812 commit_threads = num_online_cpus(); 813 if (commit_threads > MAX_COMMIT_THREADS) 814 commit_threads = MAX_COMMIT_THREADS; 815 816 for (i = 0; i < commit_threads; i++) { 817 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, "jfsCommit"); 818 if (IS_ERR(jfsCommitThread[i])) { 819 rc = PTR_ERR(jfsCommitThread[i]); 820 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 821 commit_threads = i; 822 goto kill_committask; 823 } 824 } 825 826 jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync"); 827 if (IS_ERR(jfsSyncThread)) { 828 rc = PTR_ERR(jfsSyncThread); 829 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 830 goto kill_committask; 831 } 832 833 #ifdef PROC_FS_JFS 834 jfs_proc_init(); 835 #endif 836 837 return register_filesystem(&jfs_fs_type); 838 839 kill_committask: 840 for (i = 0; i < commit_threads; i++) 841 kthread_stop(jfsCommitThread[i]); 842 kthread_stop(jfsIOthread); 843 end_txmngr: 844 txExit(); 845 free_metapage: 846 metapage_exit(); 847 free_slab: 848 kmem_cache_destroy(jfs_inode_cachep); 849 return rc; 850 } 851 852 static void __exit exit_jfs_fs(void) 853 { 854 int i; 855 856 jfs_info("exit_jfs_fs called"); 857 858 txExit(); 859 metapage_exit(); 860 861 kthread_stop(jfsIOthread); 862 for (i = 0; i < commit_threads; i++) 863 kthread_stop(jfsCommitThread[i]); 864 kthread_stop(jfsSyncThread); 865 #ifdef PROC_FS_JFS 866 jfs_proc_clean(); 867 #endif 868 unregister_filesystem(&jfs_fs_type); 869 kmem_cache_destroy(jfs_inode_cachep); 870 } 871 872 module_init(init_jfs_fs) 873 module_exit(exit_jfs_fs) 874