1 /* 2 * Copyright (C) International Business Machines Corp., 2000-2004 3 * Portions Copyright (C) Christoph Hellwig, 2001-2002 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; either version 2 of the License, or 8 * (at your option) any later version. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See 13 * the GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 18 */ 19 20 #include <linux/fs.h> 21 #include <linux/module.h> 22 #include <linux/parser.h> 23 #include <linux/completion.h> 24 #include <linux/vfs.h> 25 #include <linux/quotaops.h> 26 #include <linux/mount.h> 27 #include <linux/moduleparam.h> 28 #include <linux/kthread.h> 29 #include <linux/posix_acl.h> 30 #include <linux/buffer_head.h> 31 #include <linux/exportfs.h> 32 #include <linux/crc32.h> 33 #include <linux/slab.h> 34 #include <asm/uaccess.h> 35 #include <linux/seq_file.h> 36 #include <linux/smp_lock.h> 37 38 #include "jfs_incore.h" 39 #include "jfs_filsys.h" 40 #include "jfs_inode.h" 41 #include "jfs_metapage.h" 42 #include "jfs_superblock.h" 43 #include "jfs_dmap.h" 44 #include "jfs_imap.h" 45 #include "jfs_acl.h" 46 #include "jfs_debug.h" 47 48 MODULE_DESCRIPTION("The Journaled Filesystem (JFS)"); 49 MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM"); 50 MODULE_LICENSE("GPL"); 51 52 static struct kmem_cache * jfs_inode_cachep; 53 54 static const struct super_operations jfs_super_operations; 55 static const struct export_operations jfs_export_operations; 56 static struct file_system_type jfs_fs_type; 57 58 #define MAX_COMMIT_THREADS 64 59 static int commit_threads = 0; 60 module_param(commit_threads, int, 0); 61 MODULE_PARM_DESC(commit_threads, "Number of commit threads"); 62 63 static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS]; 64 struct task_struct *jfsIOthread; 65 struct task_struct *jfsSyncThread; 66 67 #ifdef CONFIG_JFS_DEBUG 68 int jfsloglevel = JFS_LOGLEVEL_WARN; 69 module_param(jfsloglevel, int, 0644); 70 MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)"); 71 #endif 72 73 static void jfs_handle_error(struct super_block *sb) 74 { 75 struct jfs_sb_info *sbi = JFS_SBI(sb); 76 77 if (sb->s_flags & MS_RDONLY) 78 return; 79 80 updateSuper(sb, FM_DIRTY); 81 82 if (sbi->flag & JFS_ERR_PANIC) 83 panic("JFS (device %s): panic forced after error\n", 84 sb->s_id); 85 else if (sbi->flag & JFS_ERR_REMOUNT_RO) { 86 jfs_err("ERROR: (device %s): remounting filesystem " 87 "as read-only\n", 88 sb->s_id); 89 sb->s_flags |= MS_RDONLY; 90 } 91 92 /* nothing is done for continue beyond marking the superblock dirty */ 93 } 94 95 void jfs_error(struct super_block *sb, const char * function, ...) 96 { 97 static char error_buf[256]; 98 va_list args; 99 100 va_start(args, function); 101 vsnprintf(error_buf, sizeof(error_buf), function, args); 102 va_end(args); 103 104 printk(KERN_ERR "ERROR: (device %s): %s\n", sb->s_id, error_buf); 105 106 jfs_handle_error(sb); 107 } 108 109 static struct inode *jfs_alloc_inode(struct super_block *sb) 110 { 111 struct jfs_inode_info *jfs_inode; 112 113 jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS); 114 if (!jfs_inode) 115 return NULL; 116 return &jfs_inode->vfs_inode; 117 } 118 119 static void jfs_destroy_inode(struct inode *inode) 120 { 121 struct jfs_inode_info *ji = JFS_IP(inode); 122 123 BUG_ON(!list_empty(&ji->anon_inode_list)); 124 125 spin_lock_irq(&ji->ag_lock); 126 if (ji->active_ag != -1) { 127 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap; 128 atomic_dec(&bmap->db_active[ji->active_ag]); 129 ji->active_ag = -1; 130 } 131 spin_unlock_irq(&ji->ag_lock); 132 kmem_cache_free(jfs_inode_cachep, ji); 133 } 134 135 static void jfs_clear_inode(struct inode *inode) 136 { 137 dquot_drop(inode); 138 } 139 140 static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf) 141 { 142 struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb); 143 s64 maxinodes; 144 struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap; 145 146 jfs_info("In jfs_statfs"); 147 buf->f_type = JFS_SUPER_MAGIC; 148 buf->f_bsize = sbi->bsize; 149 buf->f_blocks = sbi->bmap->db_mapsize; 150 buf->f_bfree = sbi->bmap->db_nfree; 151 buf->f_bavail = sbi->bmap->db_nfree; 152 /* 153 * If we really return the number of allocated & free inodes, some 154 * applications will fail because they won't see enough free inodes. 155 * We'll try to calculate some guess as to how may inodes we can 156 * really allocate 157 * 158 * buf->f_files = atomic_read(&imap->im_numinos); 159 * buf->f_ffree = atomic_read(&imap->im_numfree); 160 */ 161 maxinodes = min((s64) atomic_read(&imap->im_numinos) + 162 ((sbi->bmap->db_nfree >> imap->im_l2nbperiext) 163 << L2INOSPEREXT), (s64) 0xffffffffLL); 164 buf->f_files = maxinodes; 165 buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) - 166 atomic_read(&imap->im_numfree)); 167 buf->f_fsid.val[0] = (u32)crc32_le(0, sbi->uuid, sizeof(sbi->uuid)/2); 168 buf->f_fsid.val[1] = (u32)crc32_le(0, sbi->uuid + sizeof(sbi->uuid)/2, 169 sizeof(sbi->uuid)/2); 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"); 181 182 lock_kernel(); 183 184 rc = jfs_umount(sb); 185 if (rc) 186 jfs_err("jfs_umount failed with return code %d", rc); 187 188 unload_nls(sbi->nls_tab); 189 190 truncate_inode_pages(sbi->direct_inode->i_mapping, 0); 191 iput(sbi->direct_inode); 192 193 kfree(sbi); 194 195 unlock_kernel(); 196 } 197 198 enum { 199 Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize, 200 Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota, 201 Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask 202 }; 203 204 static const match_table_t tokens = { 205 {Opt_integrity, "integrity"}, 206 {Opt_nointegrity, "nointegrity"}, 207 {Opt_iocharset, "iocharset=%s"}, 208 {Opt_resize, "resize=%u"}, 209 {Opt_resize_nosize, "resize"}, 210 {Opt_errors, "errors=%s"}, 211 {Opt_ignore, "noquota"}, 212 {Opt_ignore, "quota"}, 213 {Opt_usrquota, "usrquota"}, 214 {Opt_grpquota, "grpquota"}, 215 {Opt_uid, "uid=%u"}, 216 {Opt_gid, "gid=%u"}, 217 {Opt_umask, "umask=%u"}, 218 {Opt_err, NULL} 219 }; 220 221 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize, 222 int *flag) 223 { 224 void *nls_map = (void *)-1; /* -1: no change; NULL: none */ 225 char *p; 226 struct jfs_sb_info *sbi = JFS_SBI(sb); 227 228 *newLVSize = 0; 229 230 if (!options) 231 return 1; 232 233 while ((p = strsep(&options, ",")) != NULL) { 234 substring_t args[MAX_OPT_ARGS]; 235 int token; 236 if (!*p) 237 continue; 238 239 token = match_token(p, tokens, args); 240 switch (token) { 241 case Opt_integrity: 242 *flag &= ~JFS_NOINTEGRITY; 243 break; 244 case Opt_nointegrity: 245 *flag |= JFS_NOINTEGRITY; 246 break; 247 case Opt_ignore: 248 /* Silently ignore the quota options */ 249 /* Don't do anything ;-) */ 250 break; 251 case Opt_iocharset: 252 if (nls_map && nls_map != (void *) -1) 253 unload_nls(nls_map); 254 if (!strcmp(args[0].from, "none")) 255 nls_map = NULL; 256 else { 257 nls_map = load_nls(args[0].from); 258 if (!nls_map) { 259 printk(KERN_ERR 260 "JFS: charset not found\n"); 261 goto cleanup; 262 } 263 } 264 break; 265 case Opt_resize: 266 { 267 char *resize = args[0].from; 268 *newLVSize = simple_strtoull(resize, &resize, 0); 269 break; 270 } 271 case Opt_resize_nosize: 272 { 273 *newLVSize = sb->s_bdev->bd_inode->i_size >> 274 sb->s_blocksize_bits; 275 if (*newLVSize == 0) 276 printk(KERN_ERR 277 "JFS: Cannot determine volume size\n"); 278 break; 279 } 280 case Opt_errors: 281 { 282 char *errors = args[0].from; 283 if (!errors || !*errors) 284 goto cleanup; 285 if (!strcmp(errors, "continue")) { 286 *flag &= ~JFS_ERR_REMOUNT_RO; 287 *flag &= ~JFS_ERR_PANIC; 288 *flag |= JFS_ERR_CONTINUE; 289 } else if (!strcmp(errors, "remount-ro")) { 290 *flag &= ~JFS_ERR_CONTINUE; 291 *flag &= ~JFS_ERR_PANIC; 292 *flag |= JFS_ERR_REMOUNT_RO; 293 } else if (!strcmp(errors, "panic")) { 294 *flag &= ~JFS_ERR_CONTINUE; 295 *flag &= ~JFS_ERR_REMOUNT_RO; 296 *flag |= JFS_ERR_PANIC; 297 } else { 298 printk(KERN_ERR 299 "JFS: %s is an invalid error handler\n", 300 errors); 301 goto cleanup; 302 } 303 break; 304 } 305 306 #ifdef CONFIG_QUOTA 307 case Opt_quota: 308 case Opt_usrquota: 309 *flag |= JFS_USRQUOTA; 310 break; 311 case Opt_grpquota: 312 *flag |= JFS_GRPQUOTA; 313 break; 314 #else 315 case Opt_usrquota: 316 case Opt_grpquota: 317 case Opt_quota: 318 printk(KERN_ERR 319 "JFS: quota operations not supported\n"); 320 break; 321 #endif 322 case Opt_uid: 323 { 324 char *uid = args[0].from; 325 sbi->uid = simple_strtoul(uid, &uid, 0); 326 break; 327 } 328 case Opt_gid: 329 { 330 char *gid = args[0].from; 331 sbi->gid = simple_strtoul(gid, &gid, 0); 332 break; 333 } 334 case Opt_umask: 335 { 336 char *umask = args[0].from; 337 sbi->umask = simple_strtoul(umask, &umask, 8); 338 if (sbi->umask & ~0777) { 339 printk(KERN_ERR 340 "JFS: Invalid value of umask\n"); 341 goto cleanup; 342 } 343 break; 344 } 345 default: 346 printk("jfs: Unrecognized mount option \"%s\" " 347 " or missing value\n", p); 348 goto cleanup; 349 } 350 } 351 352 if (nls_map != (void *) -1) { 353 /* Discard old (if remount) */ 354 unload_nls(sbi->nls_tab); 355 sbi->nls_tab = nls_map; 356 } 357 return 1; 358 359 cleanup: 360 if (nls_map && nls_map != (void *) -1) 361 unload_nls(nls_map); 362 return 0; 363 } 364 365 static int jfs_remount(struct super_block *sb, int *flags, char *data) 366 { 367 s64 newLVSize = 0; 368 int rc = 0; 369 int flag = JFS_SBI(sb)->flag; 370 int ret; 371 372 if (!parse_options(data, sb, &newLVSize, &flag)) { 373 return -EINVAL; 374 } 375 lock_kernel(); 376 if (newLVSize) { 377 if (sb->s_flags & MS_RDONLY) { 378 printk(KERN_ERR 379 "JFS: resize requires volume to be mounted read-write\n"); 380 unlock_kernel(); 381 return -EROFS; 382 } 383 rc = jfs_extendfs(sb, newLVSize, 0); 384 if (rc) { 385 unlock_kernel(); 386 return rc; 387 } 388 } 389 390 if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) { 391 /* 392 * Invalidate any previously read metadata. fsck may have 393 * changed the on-disk data since we mounted r/o 394 */ 395 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0); 396 397 JFS_SBI(sb)->flag = flag; 398 ret = jfs_mount_rw(sb, 1); 399 unlock_kernel(); 400 return ret; 401 } 402 if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) { 403 rc = jfs_umount_rw(sb); 404 JFS_SBI(sb)->flag = flag; 405 unlock_kernel(); 406 return rc; 407 } 408 if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY)) 409 if (!(sb->s_flags & MS_RDONLY)) { 410 rc = jfs_umount_rw(sb); 411 if (rc) { 412 unlock_kernel(); 413 return rc; 414 } 415 JFS_SBI(sb)->flag = flag; 416 ret = jfs_mount_rw(sb, 1); 417 unlock_kernel(); 418 return ret; 419 } 420 JFS_SBI(sb)->flag = flag; 421 422 unlock_kernel(); 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 sb->s_fs_info = sbi; 443 sbi->sb = sb; 444 sbi->uid = sbi->gid = sbi->umask = -1; 445 446 /* initialize the mount flag and determine the default error handler */ 447 flag = JFS_ERR_REMOUNT_RO; 448 449 if (!parse_options((char *) data, sb, &newLVSize, &flag)) 450 goto out_kfree; 451 sbi->flag = flag; 452 453 #ifdef CONFIG_JFS_POSIX_ACL 454 sb->s_flags |= MS_POSIXACL; 455 #endif 456 457 if (newLVSize) { 458 printk(KERN_ERR "resize option for remount only\n"); 459 goto out_kfree; 460 } 461 462 /* 463 * Initialize blocksize to 4K. 464 */ 465 sb_set_blocksize(sb, PSIZE); 466 467 /* 468 * Set method vectors. 469 */ 470 sb->s_op = &jfs_super_operations; 471 sb->s_export_op = &jfs_export_operations; 472 473 /* 474 * Initialize direct-mapping inode/address-space 475 */ 476 inode = new_inode(sb); 477 if (inode == NULL) { 478 ret = -ENOMEM; 479 goto out_unload; 480 } 481 inode->i_ino = 0; 482 inode->i_nlink = 1; 483 inode->i_size = sb->s_bdev->bd_inode->i_size; 484 inode->i_mapping->a_ops = &jfs_metapage_aops; 485 insert_inode_hash(inode); 486 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS); 487 488 sbi->direct_inode = inode; 489 490 rc = jfs_mount(sb); 491 if (rc) { 492 if (!silent) { 493 jfs_err("jfs_mount failed w/return code = %d", rc); 494 } 495 goto out_mount_failed; 496 } 497 if (sb->s_flags & MS_RDONLY) 498 sbi->log = NULL; 499 else { 500 rc = jfs_mount_rw(sb, 0); 501 if (rc) { 502 if (!silent) { 503 jfs_err("jfs_mount_rw failed, return code = %d", 504 rc); 505 } 506 goto out_no_rw; 507 } 508 } 509 510 sb->s_magic = JFS_SUPER_MAGIC; 511 512 inode = jfs_iget(sb, ROOT_I); 513 if (IS_ERR(inode)) { 514 ret = PTR_ERR(inode); 515 goto out_no_rw; 516 } 517 sb->s_root = d_alloc_root(inode); 518 if (!sb->s_root) 519 goto out_no_root; 520 521 if (sbi->mntflag & JFS_OS2) 522 sb->s_root->d_op = &jfs_ci_dentry_operations; 523 524 /* logical blocks are represented by 40 bits in pxd_t, etc. */ 525 sb->s_maxbytes = ((u64) sb->s_blocksize) << 40; 526 #if BITS_PER_LONG == 32 527 /* 528 * Page cache is indexed by long. 529 * I would use MAX_LFS_FILESIZE, but it's only half as big 530 */ 531 sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, (u64)sb->s_maxbytes); 532 #endif 533 sb->s_time_gran = 1; 534 return 0; 535 536 out_no_root: 537 jfs_err("jfs_read_super: get root dentry failed"); 538 iput(inode); 539 540 out_no_rw: 541 rc = jfs_umount(sb); 542 if (rc) { 543 jfs_err("jfs_umount failed with return code %d", rc); 544 } 545 out_mount_failed: 546 filemap_write_and_wait(sbi->direct_inode->i_mapping); 547 truncate_inode_pages(sbi->direct_inode->i_mapping, 0); 548 make_bad_inode(sbi->direct_inode); 549 iput(sbi->direct_inode); 550 sbi->direct_inode = NULL; 551 out_unload: 552 if (sbi->nls_tab) 553 unload_nls(sbi->nls_tab); 554 out_kfree: 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