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