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 const 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, ret = -EINVAL; 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 ret = -ENOMEM; 466 goto out_kfree; 467 } 468 inode->i_ino = 0; 469 inode->i_nlink = 1; 470 inode->i_size = sb->s_bdev->bd_inode->i_size; 471 inode->i_mapping->a_ops = &jfs_metapage_aops; 472 insert_inode_hash(inode); 473 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS); 474 475 sbi->direct_inode = inode; 476 477 rc = jfs_mount(sb); 478 if (rc) { 479 if (!silent) { 480 jfs_err("jfs_mount failed w/return code = %d", rc); 481 } 482 goto out_mount_failed; 483 } 484 if (sb->s_flags & MS_RDONLY) 485 sbi->log = NULL; 486 else { 487 rc = jfs_mount_rw(sb, 0); 488 if (rc) { 489 if (!silent) { 490 jfs_err("jfs_mount_rw failed, return code = %d", 491 rc); 492 } 493 goto out_no_rw; 494 } 495 } 496 497 sb->s_magic = JFS_SUPER_MAGIC; 498 499 inode = jfs_iget(sb, ROOT_I); 500 if (IS_ERR(inode)) { 501 ret = PTR_ERR(inode); 502 goto out_no_rw; 503 } 504 sb->s_root = d_alloc_root(inode); 505 if (!sb->s_root) 506 goto out_no_root; 507 508 if (sbi->mntflag & JFS_OS2) 509 sb->s_root->d_op = &jfs_ci_dentry_operations; 510 511 /* logical blocks are represented by 40 bits in pxd_t, etc. */ 512 sb->s_maxbytes = ((u64) sb->s_blocksize) << 40; 513 #if BITS_PER_LONG == 32 514 /* 515 * Page cache is indexed by long. 516 * I would use MAX_LFS_FILESIZE, but it's only half as big 517 */ 518 sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, sb->s_maxbytes); 519 #endif 520 sb->s_time_gran = 1; 521 return 0; 522 523 out_no_root: 524 jfs_err("jfs_read_super: get root dentry failed"); 525 iput(inode); 526 527 out_no_rw: 528 rc = jfs_umount(sb); 529 if (rc) { 530 jfs_err("jfs_umount failed with return code %d", rc); 531 } 532 out_mount_failed: 533 filemap_write_and_wait(sbi->direct_inode->i_mapping); 534 truncate_inode_pages(sbi->direct_inode->i_mapping, 0); 535 make_bad_inode(sbi->direct_inode); 536 iput(sbi->direct_inode); 537 sbi->direct_inode = NULL; 538 out_kfree: 539 if (sbi->nls_tab) 540 unload_nls(sbi->nls_tab); 541 kfree(sbi); 542 return ret; 543 } 544 545 static void jfs_write_super_lockfs(struct super_block *sb) 546 { 547 struct jfs_sb_info *sbi = JFS_SBI(sb); 548 struct jfs_log *log = sbi->log; 549 550 if (!(sb->s_flags & MS_RDONLY)) { 551 txQuiesce(sb); 552 lmLogShutdown(log); 553 updateSuper(sb, FM_CLEAN); 554 } 555 } 556 557 static void jfs_unlockfs(struct super_block *sb) 558 { 559 struct jfs_sb_info *sbi = JFS_SBI(sb); 560 struct jfs_log *log = sbi->log; 561 int rc = 0; 562 563 if (!(sb->s_flags & MS_RDONLY)) { 564 updateSuper(sb, FM_MOUNT); 565 if ((rc = lmLogInit(log))) 566 jfs_err("jfs_unlock failed with return code %d", rc); 567 else 568 txResume(sb); 569 } 570 } 571 572 static int jfs_get_sb(struct file_system_type *fs_type, 573 int flags, const char *dev_name, void *data, struct vfsmount *mnt) 574 { 575 return get_sb_bdev(fs_type, flags, dev_name, data, jfs_fill_super, 576 mnt); 577 } 578 579 static int jfs_sync_fs(struct super_block *sb, int wait) 580 { 581 struct jfs_log *log = JFS_SBI(sb)->log; 582 583 /* log == NULL indicates read-only mount */ 584 if (log) { 585 jfs_flush_journal(log, wait); 586 jfs_syncpt(log, 0); 587 } 588 589 return 0; 590 } 591 592 static int jfs_show_options(struct seq_file *seq, struct vfsmount *vfs) 593 { 594 struct jfs_sb_info *sbi = JFS_SBI(vfs->mnt_sb); 595 596 if (sbi->uid != -1) 597 seq_printf(seq, ",uid=%d", sbi->uid); 598 if (sbi->gid != -1) 599 seq_printf(seq, ",gid=%d", sbi->gid); 600 if (sbi->umask != -1) 601 seq_printf(seq, ",umask=%03o", sbi->umask); 602 if (sbi->flag & JFS_NOINTEGRITY) 603 seq_puts(seq, ",nointegrity"); 604 if (sbi->nls_tab) 605 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset); 606 if (sbi->flag & JFS_ERR_CONTINUE) 607 seq_printf(seq, ",errors=continue"); 608 if (sbi->flag & JFS_ERR_PANIC) 609 seq_printf(seq, ",errors=panic"); 610 611 #ifdef CONFIG_QUOTA 612 if (sbi->flag & JFS_USRQUOTA) 613 seq_puts(seq, ",usrquota"); 614 615 if (sbi->flag & JFS_GRPQUOTA) 616 seq_puts(seq, ",grpquota"); 617 #endif 618 619 return 0; 620 } 621 622 #ifdef CONFIG_QUOTA 623 624 /* Read data from quotafile - avoid pagecache and such because we cannot afford 625 * acquiring the locks... As quota files are never truncated and quota code 626 * itself serializes the operations (and noone else should touch the files) 627 * we don't have to be afraid of races */ 628 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data, 629 size_t len, loff_t off) 630 { 631 struct inode *inode = sb_dqopt(sb)->files[type]; 632 sector_t blk = off >> sb->s_blocksize_bits; 633 int err = 0; 634 int offset = off & (sb->s_blocksize - 1); 635 int tocopy; 636 size_t toread; 637 struct buffer_head tmp_bh; 638 struct buffer_head *bh; 639 loff_t i_size = i_size_read(inode); 640 641 if (off > i_size) 642 return 0; 643 if (off+len > i_size) 644 len = i_size-off; 645 toread = len; 646 while (toread > 0) { 647 tocopy = sb->s_blocksize - offset < toread ? 648 sb->s_blocksize - offset : toread; 649 650 tmp_bh.b_state = 0; 651 tmp_bh.b_size = 1 << inode->i_blkbits; 652 err = jfs_get_block(inode, blk, &tmp_bh, 0); 653 if (err) 654 return err; 655 if (!buffer_mapped(&tmp_bh)) /* A hole? */ 656 memset(data, 0, tocopy); 657 else { 658 bh = sb_bread(sb, tmp_bh.b_blocknr); 659 if (!bh) 660 return -EIO; 661 memcpy(data, bh->b_data+offset, tocopy); 662 brelse(bh); 663 } 664 offset = 0; 665 toread -= tocopy; 666 data += tocopy; 667 blk++; 668 } 669 return len; 670 } 671 672 /* Write to quotafile */ 673 static ssize_t jfs_quota_write(struct super_block *sb, int type, 674 const char *data, size_t len, loff_t off) 675 { 676 struct inode *inode = sb_dqopt(sb)->files[type]; 677 sector_t blk = off >> sb->s_blocksize_bits; 678 int err = 0; 679 int offset = off & (sb->s_blocksize - 1); 680 int tocopy; 681 size_t towrite = len; 682 struct buffer_head tmp_bh; 683 struct buffer_head *bh; 684 685 mutex_lock(&inode->i_mutex); 686 while (towrite > 0) { 687 tocopy = sb->s_blocksize - offset < towrite ? 688 sb->s_blocksize - offset : towrite; 689 690 tmp_bh.b_state = 0; 691 tmp_bh.b_size = 1 << inode->i_blkbits; 692 err = jfs_get_block(inode, blk, &tmp_bh, 1); 693 if (err) 694 goto out; 695 if (offset || tocopy != sb->s_blocksize) 696 bh = sb_bread(sb, tmp_bh.b_blocknr); 697 else 698 bh = sb_getblk(sb, tmp_bh.b_blocknr); 699 if (!bh) { 700 err = -EIO; 701 goto out; 702 } 703 lock_buffer(bh); 704 memcpy(bh->b_data+offset, data, tocopy); 705 flush_dcache_page(bh->b_page); 706 set_buffer_uptodate(bh); 707 mark_buffer_dirty(bh); 708 unlock_buffer(bh); 709 brelse(bh); 710 offset = 0; 711 towrite -= tocopy; 712 data += tocopy; 713 blk++; 714 } 715 out: 716 if (len == towrite) 717 return err; 718 if (inode->i_size < off+len-towrite) 719 i_size_write(inode, off+len-towrite); 720 inode->i_version++; 721 inode->i_mtime = inode->i_ctime = CURRENT_TIME; 722 mark_inode_dirty(inode); 723 mutex_unlock(&inode->i_mutex); 724 return len - towrite; 725 } 726 727 #endif 728 729 static const struct super_operations jfs_super_operations = { 730 .alloc_inode = jfs_alloc_inode, 731 .destroy_inode = jfs_destroy_inode, 732 .dirty_inode = jfs_dirty_inode, 733 .write_inode = jfs_write_inode, 734 .delete_inode = jfs_delete_inode, 735 .put_super = jfs_put_super, 736 .sync_fs = jfs_sync_fs, 737 .write_super_lockfs = jfs_write_super_lockfs, 738 .unlockfs = jfs_unlockfs, 739 .statfs = jfs_statfs, 740 .remount_fs = jfs_remount, 741 .show_options = jfs_show_options, 742 #ifdef CONFIG_QUOTA 743 .quota_read = jfs_quota_read, 744 .quota_write = jfs_quota_write, 745 #endif 746 }; 747 748 static const struct export_operations jfs_export_operations = { 749 .fh_to_dentry = jfs_fh_to_dentry, 750 .fh_to_parent = jfs_fh_to_parent, 751 .get_parent = jfs_get_parent, 752 }; 753 754 static struct file_system_type jfs_fs_type = { 755 .owner = THIS_MODULE, 756 .name = "jfs", 757 .get_sb = jfs_get_sb, 758 .kill_sb = kill_block_super, 759 .fs_flags = FS_REQUIRES_DEV, 760 }; 761 762 static void init_once(struct kmem_cache *cachep, void *foo) 763 { 764 struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo; 765 766 memset(jfs_ip, 0, sizeof(struct jfs_inode_info)); 767 INIT_LIST_HEAD(&jfs_ip->anon_inode_list); 768 init_rwsem(&jfs_ip->rdwrlock); 769 mutex_init(&jfs_ip->commit_mutex); 770 init_rwsem(&jfs_ip->xattr_sem); 771 spin_lock_init(&jfs_ip->ag_lock); 772 jfs_ip->active_ag = -1; 773 #ifdef CONFIG_JFS_POSIX_ACL 774 jfs_ip->i_acl = JFS_ACL_NOT_CACHED; 775 jfs_ip->i_default_acl = JFS_ACL_NOT_CACHED; 776 #endif 777 inode_init_once(&jfs_ip->vfs_inode); 778 } 779 780 static int __init init_jfs_fs(void) 781 { 782 int i; 783 int rc; 784 785 jfs_inode_cachep = 786 kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0, 787 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, 788 init_once); 789 if (jfs_inode_cachep == NULL) 790 return -ENOMEM; 791 792 /* 793 * Metapage initialization 794 */ 795 rc = metapage_init(); 796 if (rc) { 797 jfs_err("metapage_init failed w/rc = %d", rc); 798 goto free_slab; 799 } 800 801 /* 802 * Transaction Manager initialization 803 */ 804 rc = txInit(); 805 if (rc) { 806 jfs_err("txInit failed w/rc = %d", rc); 807 goto free_metapage; 808 } 809 810 /* 811 * I/O completion thread (endio) 812 */ 813 jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO"); 814 if (IS_ERR(jfsIOthread)) { 815 rc = PTR_ERR(jfsIOthread); 816 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 817 goto end_txmngr; 818 } 819 820 if (commit_threads < 1) 821 commit_threads = num_online_cpus(); 822 if (commit_threads > MAX_COMMIT_THREADS) 823 commit_threads = MAX_COMMIT_THREADS; 824 825 for (i = 0; i < commit_threads; i++) { 826 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, "jfsCommit"); 827 if (IS_ERR(jfsCommitThread[i])) { 828 rc = PTR_ERR(jfsCommitThread[i]); 829 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 830 commit_threads = i; 831 goto kill_committask; 832 } 833 } 834 835 jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync"); 836 if (IS_ERR(jfsSyncThread)) { 837 rc = PTR_ERR(jfsSyncThread); 838 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 839 goto kill_committask; 840 } 841 842 #ifdef PROC_FS_JFS 843 jfs_proc_init(); 844 #endif 845 846 return register_filesystem(&jfs_fs_type); 847 848 kill_committask: 849 for (i = 0; i < commit_threads; i++) 850 kthread_stop(jfsCommitThread[i]); 851 kthread_stop(jfsIOthread); 852 end_txmngr: 853 txExit(); 854 free_metapage: 855 metapage_exit(); 856 free_slab: 857 kmem_cache_destroy(jfs_inode_cachep); 858 return rc; 859 } 860 861 static void __exit exit_jfs_fs(void) 862 { 863 int i; 864 865 jfs_info("exit_jfs_fs called"); 866 867 txExit(); 868 metapage_exit(); 869 870 kthread_stop(jfsIOthread); 871 for (i = 0; i < commit_threads; i++) 872 kthread_stop(jfsCommitThread[i]); 873 kthread_stop(jfsSyncThread); 874 #ifdef PROC_FS_JFS 875 jfs_proc_clean(); 876 #endif 877 unregister_filesystem(&jfs_fs_type); 878 kmem_cache_destroy(jfs_inode_cachep); 879 } 880 881 module_init(init_jfs_fs) 882 module_exit(exit_jfs_fs) 883