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 <asm/uaccess.h> 31 #include <linux/seq_file.h> 32 33 #include "jfs_incore.h" 34 #include "jfs_filsys.h" 35 #include "jfs_inode.h" 36 #include "jfs_metapage.h" 37 #include "jfs_superblock.h" 38 #include "jfs_dmap.h" 39 #include "jfs_imap.h" 40 #include "jfs_acl.h" 41 #include "jfs_debug.h" 42 43 MODULE_DESCRIPTION("The Journaled Filesystem (JFS)"); 44 MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM"); 45 MODULE_LICENSE("GPL"); 46 47 static struct kmem_cache * jfs_inode_cachep; 48 49 static struct super_operations jfs_super_operations; 50 static struct export_operations jfs_export_operations; 51 static struct file_system_type jfs_fs_type; 52 53 #define MAX_COMMIT_THREADS 64 54 static int commit_threads = 0; 55 module_param(commit_threads, int, 0); 56 MODULE_PARM_DESC(commit_threads, "Number of commit threads"); 57 58 static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS]; 59 struct task_struct *jfsIOthread; 60 struct task_struct *jfsSyncThread; 61 62 #ifdef CONFIG_JFS_DEBUG 63 int jfsloglevel = JFS_LOGLEVEL_WARN; 64 module_param(jfsloglevel, int, 0644); 65 MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)"); 66 #endif 67 68 static void jfs_handle_error(struct super_block *sb) 69 { 70 struct jfs_sb_info *sbi = JFS_SBI(sb); 71 72 if (sb->s_flags & MS_RDONLY) 73 return; 74 75 updateSuper(sb, FM_DIRTY); 76 77 if (sbi->flag & JFS_ERR_PANIC) 78 panic("JFS (device %s): panic forced after error\n", 79 sb->s_id); 80 else if (sbi->flag & JFS_ERR_REMOUNT_RO) { 81 jfs_err("ERROR: (device %s): remounting filesystem " 82 "as read-only\n", 83 sb->s_id); 84 sb->s_flags |= MS_RDONLY; 85 } 86 87 /* nothing is done for continue beyond marking the superblock dirty */ 88 } 89 90 void jfs_error(struct super_block *sb, const char * function, ...) 91 { 92 static char error_buf[256]; 93 va_list args; 94 95 va_start(args, function); 96 vsnprintf(error_buf, sizeof(error_buf), function, args); 97 va_end(args); 98 99 printk(KERN_ERR "ERROR: (device %s): %s\n", sb->s_id, error_buf); 100 101 jfs_handle_error(sb); 102 } 103 104 static struct inode *jfs_alloc_inode(struct super_block *sb) 105 { 106 struct jfs_inode_info *jfs_inode; 107 108 jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS); 109 if (!jfs_inode) 110 return NULL; 111 return &jfs_inode->vfs_inode; 112 } 113 114 static void jfs_destroy_inode(struct inode *inode) 115 { 116 struct jfs_inode_info *ji = JFS_IP(inode); 117 118 BUG_ON(!list_empty(&ji->anon_inode_list)); 119 120 spin_lock_irq(&ji->ag_lock); 121 if (ji->active_ag != -1) { 122 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap; 123 atomic_dec(&bmap->db_active[ji->active_ag]); 124 ji->active_ag = -1; 125 } 126 spin_unlock_irq(&ji->ag_lock); 127 128 #ifdef CONFIG_JFS_POSIX_ACL 129 if (ji->i_acl != JFS_ACL_NOT_CACHED) { 130 posix_acl_release(ji->i_acl); 131 ji->i_acl = JFS_ACL_NOT_CACHED; 132 } 133 if (ji->i_default_acl != JFS_ACL_NOT_CACHED) { 134 posix_acl_release(ji->i_default_acl); 135 ji->i_default_acl = JFS_ACL_NOT_CACHED; 136 } 137 #endif 138 139 kmem_cache_free(jfs_inode_cachep, ji); 140 } 141 142 static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf) 143 { 144 struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb); 145 s64 maxinodes; 146 struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap; 147 148 jfs_info("In jfs_statfs"); 149 buf->f_type = JFS_SUPER_MAGIC; 150 buf->f_bsize = sbi->bsize; 151 buf->f_blocks = sbi->bmap->db_mapsize; 152 buf->f_bfree = sbi->bmap->db_nfree; 153 buf->f_bavail = sbi->bmap->db_nfree; 154 /* 155 * If we really return the number of allocated & free inodes, some 156 * applications will fail because they won't see enough free inodes. 157 * We'll try to calculate some guess as to how may inodes we can 158 * really allocate 159 * 160 * buf->f_files = atomic_read(&imap->im_numinos); 161 * buf->f_ffree = atomic_read(&imap->im_numfree); 162 */ 163 maxinodes = min((s64) atomic_read(&imap->im_numinos) + 164 ((sbi->bmap->db_nfree >> imap->im_l2nbperiext) 165 << L2INOSPEREXT), (s64) 0xffffffffLL); 166 buf->f_files = maxinodes; 167 buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) - 168 atomic_read(&imap->im_numfree)); 169 170 buf->f_namelen = JFS_NAME_MAX; 171 return 0; 172 } 173 174 static void jfs_put_super(struct super_block *sb) 175 { 176 struct jfs_sb_info *sbi = JFS_SBI(sb); 177 int rc; 178 179 jfs_info("In jfs_put_super"); 180 rc = jfs_umount(sb); 181 if (rc) 182 jfs_err("jfs_umount failed with return code %d", rc); 183 if (sbi->nls_tab) 184 unload_nls(sbi->nls_tab); 185 sbi->nls_tab = NULL; 186 187 truncate_inode_pages(sbi->direct_inode->i_mapping, 0); 188 iput(sbi->direct_inode); 189 sbi->direct_inode = NULL; 190 191 kfree(sbi); 192 } 193 194 enum { 195 Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize, 196 Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota, 197 Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask 198 }; 199 200 static match_table_t tokens = { 201 {Opt_integrity, "integrity"}, 202 {Opt_nointegrity, "nointegrity"}, 203 {Opt_iocharset, "iocharset=%s"}, 204 {Opt_resize, "resize=%u"}, 205 {Opt_resize_nosize, "resize"}, 206 {Opt_errors, "errors=%s"}, 207 {Opt_ignore, "noquota"}, 208 {Opt_ignore, "quota"}, 209 {Opt_usrquota, "usrquota"}, 210 {Opt_grpquota, "grpquota"}, 211 {Opt_uid, "uid=%u"}, 212 {Opt_gid, "gid=%u"}, 213 {Opt_umask, "umask=%u"}, 214 {Opt_err, NULL} 215 }; 216 217 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize, 218 int *flag) 219 { 220 void *nls_map = (void *)-1; /* -1: no change; NULL: none */ 221 char *p; 222 struct jfs_sb_info *sbi = JFS_SBI(sb); 223 224 *newLVSize = 0; 225 226 if (!options) 227 return 1; 228 229 while ((p = strsep(&options, ",")) != NULL) { 230 substring_t args[MAX_OPT_ARGS]; 231 int token; 232 if (!*p) 233 continue; 234 235 token = match_token(p, tokens, args); 236 switch (token) { 237 case Opt_integrity: 238 *flag &= ~JFS_NOINTEGRITY; 239 break; 240 case Opt_nointegrity: 241 *flag |= JFS_NOINTEGRITY; 242 break; 243 case Opt_ignore: 244 /* Silently ignore the quota options */ 245 /* Don't do anything ;-) */ 246 break; 247 case Opt_iocharset: 248 if (nls_map && nls_map != (void *) -1) 249 unload_nls(nls_map); 250 if (!strcmp(args[0].from, "none")) 251 nls_map = NULL; 252 else { 253 nls_map = load_nls(args[0].from); 254 if (!nls_map) { 255 printk(KERN_ERR 256 "JFS: charset not found\n"); 257 goto cleanup; 258 } 259 } 260 break; 261 case Opt_resize: 262 { 263 char *resize = args[0].from; 264 *newLVSize = simple_strtoull(resize, &resize, 0); 265 break; 266 } 267 case Opt_resize_nosize: 268 { 269 *newLVSize = sb->s_bdev->bd_inode->i_size >> 270 sb->s_blocksize_bits; 271 if (*newLVSize == 0) 272 printk(KERN_ERR 273 "JFS: Cannot determine volume size\n"); 274 break; 275 } 276 case Opt_errors: 277 { 278 char *errors = args[0].from; 279 if (!errors || !*errors) 280 goto cleanup; 281 if (!strcmp(errors, "continue")) { 282 *flag &= ~JFS_ERR_REMOUNT_RO; 283 *flag &= ~JFS_ERR_PANIC; 284 *flag |= JFS_ERR_CONTINUE; 285 } else if (!strcmp(errors, "remount-ro")) { 286 *flag &= ~JFS_ERR_CONTINUE; 287 *flag &= ~JFS_ERR_PANIC; 288 *flag |= JFS_ERR_REMOUNT_RO; 289 } else if (!strcmp(errors, "panic")) { 290 *flag &= ~JFS_ERR_CONTINUE; 291 *flag &= ~JFS_ERR_REMOUNT_RO; 292 *flag |= JFS_ERR_PANIC; 293 } else { 294 printk(KERN_ERR 295 "JFS: %s is an invalid error handler\n", 296 errors); 297 goto cleanup; 298 } 299 break; 300 } 301 302 #ifdef CONFIG_QUOTA 303 case Opt_quota: 304 case Opt_usrquota: 305 *flag |= JFS_USRQUOTA; 306 break; 307 case Opt_grpquota: 308 *flag |= JFS_GRPQUOTA; 309 break; 310 #else 311 case Opt_usrquota: 312 case Opt_grpquota: 313 case Opt_quota: 314 printk(KERN_ERR 315 "JFS: quota operations not supported\n"); 316 break; 317 #endif 318 case Opt_uid: 319 { 320 char *uid = args[0].from; 321 sbi->uid = simple_strtoul(uid, &uid, 0); 322 break; 323 } 324 case Opt_gid: 325 { 326 char *gid = args[0].from; 327 sbi->gid = simple_strtoul(gid, &gid, 0); 328 break; 329 } 330 case Opt_umask: 331 { 332 char *umask = args[0].from; 333 sbi->umask = simple_strtoul(umask, &umask, 8); 334 if (sbi->umask & ~0777) { 335 printk(KERN_ERR 336 "JFS: Invalid value of umask\n"); 337 goto cleanup; 338 } 339 break; 340 } 341 default: 342 printk("jfs: Unrecognized mount option \"%s\" " 343 " or missing value\n", p); 344 goto cleanup; 345 } 346 } 347 348 if (nls_map != (void *) -1) { 349 /* Discard old (if remount) */ 350 if (sbi->nls_tab) 351 unload_nls(sbi->nls_tab); 352 sbi->nls_tab = nls_map; 353 } 354 return 1; 355 356 cleanup: 357 if (nls_map && nls_map != (void *) -1) 358 unload_nls(nls_map); 359 return 0; 360 } 361 362 static int jfs_remount(struct super_block *sb, int *flags, char *data) 363 { 364 s64 newLVSize = 0; 365 int rc = 0; 366 int flag = JFS_SBI(sb)->flag; 367 368 if (!parse_options(data, sb, &newLVSize, &flag)) { 369 return -EINVAL; 370 } 371 if (newLVSize) { 372 if (sb->s_flags & MS_RDONLY) { 373 printk(KERN_ERR 374 "JFS: resize requires volume to be mounted read-write\n"); 375 return -EROFS; 376 } 377 rc = jfs_extendfs(sb, newLVSize, 0); 378 if (rc) 379 return rc; 380 } 381 382 if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) { 383 /* 384 * Invalidate any previously read metadata. fsck may have 385 * changed the on-disk data since we mounted r/o 386 */ 387 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0); 388 389 JFS_SBI(sb)->flag = flag; 390 return jfs_mount_rw(sb, 1); 391 } 392 if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) { 393 rc = jfs_umount_rw(sb); 394 JFS_SBI(sb)->flag = flag; 395 return rc; 396 } 397 if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY)) 398 if (!(sb->s_flags & MS_RDONLY)) { 399 rc = jfs_umount_rw(sb); 400 if (rc) 401 return rc; 402 JFS_SBI(sb)->flag = flag; 403 return jfs_mount_rw(sb, 1); 404 } 405 JFS_SBI(sb)->flag = flag; 406 407 return 0; 408 } 409 410 static int jfs_fill_super(struct super_block *sb, void *data, int silent) 411 { 412 struct jfs_sb_info *sbi; 413 struct inode *inode; 414 int rc; 415 s64 newLVSize = 0; 416 int flag; 417 418 jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags); 419 420 if (!new_valid_dev(sb->s_bdev->bd_dev)) 421 return -EOVERFLOW; 422 423 sbi = kzalloc(sizeof (struct jfs_sb_info), GFP_KERNEL); 424 if (!sbi) 425 return -ENOMEM; 426 sb->s_fs_info = sbi; 427 sbi->sb = sb; 428 sbi->uid = sbi->gid = sbi->umask = -1; 429 430 /* initialize the mount flag and determine the default error handler */ 431 flag = JFS_ERR_REMOUNT_RO; 432 433 if (!parse_options((char *) data, sb, &newLVSize, &flag)) { 434 kfree(sbi); 435 return -EINVAL; 436 } 437 sbi->flag = flag; 438 439 #ifdef CONFIG_JFS_POSIX_ACL 440 sb->s_flags |= MS_POSIXACL; 441 #endif 442 443 if (newLVSize) { 444 printk(KERN_ERR "resize option for remount only\n"); 445 return -EINVAL; 446 } 447 448 /* 449 * Initialize blocksize to 4K. 450 */ 451 sb_set_blocksize(sb, PSIZE); 452 453 /* 454 * Set method vectors. 455 */ 456 sb->s_op = &jfs_super_operations; 457 sb->s_export_op = &jfs_export_operations; 458 459 /* 460 * Initialize direct-mapping inode/address-space 461 */ 462 inode = new_inode(sb); 463 if (inode == NULL) 464 goto out_kfree; 465 inode->i_ino = 0; 466 inode->i_nlink = 1; 467 inode->i_size = sb->s_bdev->bd_inode->i_size; 468 inode->i_mapping->a_ops = &jfs_metapage_aops; 469 insert_inode_hash(inode); 470 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS); 471 472 sbi->direct_inode = inode; 473 474 rc = jfs_mount(sb); 475 if (rc) { 476 if (!silent) { 477 jfs_err("jfs_mount failed w/return code = %d", rc); 478 } 479 goto out_mount_failed; 480 } 481 if (sb->s_flags & MS_RDONLY) 482 sbi->log = NULL; 483 else { 484 rc = jfs_mount_rw(sb, 0); 485 if (rc) { 486 if (!silent) { 487 jfs_err("jfs_mount_rw failed, return code = %d", 488 rc); 489 } 490 goto out_no_rw; 491 } 492 } 493 494 sb->s_magic = JFS_SUPER_MAGIC; 495 496 inode = iget(sb, ROOT_I); 497 if (!inode || is_bad_inode(inode)) 498 goto out_no_root; 499 sb->s_root = d_alloc_root(inode); 500 if (!sb->s_root) 501 goto out_no_root; 502 503 if (sbi->mntflag & JFS_OS2) 504 sb->s_root->d_op = &jfs_ci_dentry_operations; 505 506 /* logical blocks are represented by 40 bits in pxd_t, etc. */ 507 sb->s_maxbytes = ((u64) sb->s_blocksize) << 40; 508 #if BITS_PER_LONG == 32 509 /* 510 * Page cache is indexed by long. 511 * I would use MAX_LFS_FILESIZE, but it's only half as big 512 */ 513 sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, sb->s_maxbytes); 514 #endif 515 sb->s_time_gran = 1; 516 return 0; 517 518 out_no_root: 519 jfs_err("jfs_read_super: get root inode failed"); 520 if (inode) 521 iput(inode); 522 523 out_no_rw: 524 rc = jfs_umount(sb); 525 if (rc) { 526 jfs_err("jfs_umount failed with return code %d", rc); 527 } 528 out_mount_failed: 529 filemap_write_and_wait(sbi->direct_inode->i_mapping); 530 truncate_inode_pages(sbi->direct_inode->i_mapping, 0); 531 make_bad_inode(sbi->direct_inode); 532 iput(sbi->direct_inode); 533 sbi->direct_inode = NULL; 534 out_kfree: 535 if (sbi->nls_tab) 536 unload_nls(sbi->nls_tab); 537 kfree(sbi); 538 return -EINVAL; 539 } 540 541 static void jfs_write_super_lockfs(struct super_block *sb) 542 { 543 struct jfs_sb_info *sbi = JFS_SBI(sb); 544 struct jfs_log *log = sbi->log; 545 546 if (!(sb->s_flags & MS_RDONLY)) { 547 txQuiesce(sb); 548 lmLogShutdown(log); 549 updateSuper(sb, FM_CLEAN); 550 } 551 } 552 553 static void jfs_unlockfs(struct super_block *sb) 554 { 555 struct jfs_sb_info *sbi = JFS_SBI(sb); 556 struct jfs_log *log = sbi->log; 557 int rc = 0; 558 559 if (!(sb->s_flags & MS_RDONLY)) { 560 updateSuper(sb, FM_MOUNT); 561 if ((rc = lmLogInit(log))) 562 jfs_err("jfs_unlock failed with return code %d", rc); 563 else 564 txResume(sb); 565 } 566 } 567 568 static int jfs_get_sb(struct file_system_type *fs_type, 569 int flags, const char *dev_name, void *data, struct vfsmount *mnt) 570 { 571 return get_sb_bdev(fs_type, flags, dev_name, data, jfs_fill_super, 572 mnt); 573 } 574 575 static int jfs_sync_fs(struct super_block *sb, int wait) 576 { 577 struct jfs_log *log = JFS_SBI(sb)->log; 578 579 /* log == NULL indicates read-only mount */ 580 if (log) { 581 jfs_flush_journal(log, wait); 582 jfs_syncpt(log, 0); 583 } 584 585 return 0; 586 } 587 588 static int jfs_show_options(struct seq_file *seq, struct vfsmount *vfs) 589 { 590 struct jfs_sb_info *sbi = JFS_SBI(vfs->mnt_sb); 591 592 if (sbi->uid != -1) 593 seq_printf(seq, ",uid=%d", sbi->uid); 594 if (sbi->gid != -1) 595 seq_printf(seq, ",gid=%d", sbi->gid); 596 if (sbi->umask != -1) 597 seq_printf(seq, ",umask=%03o", sbi->umask); 598 if (sbi->flag & JFS_NOINTEGRITY) 599 seq_puts(seq, ",nointegrity"); 600 601 #ifdef CONFIG_QUOTA 602 if (sbi->flag & JFS_USRQUOTA) 603 seq_puts(seq, ",usrquota"); 604 605 if (sbi->flag & JFS_GRPQUOTA) 606 seq_puts(seq, ",grpquota"); 607 #endif 608 609 return 0; 610 } 611 612 #ifdef CONFIG_QUOTA 613 614 /* Read data from quotafile - avoid pagecache and such because we cannot afford 615 * acquiring the locks... As quota files are never truncated and quota code 616 * itself serializes the operations (and noone else should touch the files) 617 * we don't have to be afraid of races */ 618 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data, 619 size_t len, loff_t off) 620 { 621 struct inode *inode = sb_dqopt(sb)->files[type]; 622 sector_t blk = off >> sb->s_blocksize_bits; 623 int err = 0; 624 int offset = off & (sb->s_blocksize - 1); 625 int tocopy; 626 size_t toread; 627 struct buffer_head tmp_bh; 628 struct buffer_head *bh; 629 loff_t i_size = i_size_read(inode); 630 631 if (off > i_size) 632 return 0; 633 if (off+len > i_size) 634 len = i_size-off; 635 toread = len; 636 while (toread > 0) { 637 tocopy = sb->s_blocksize - offset < toread ? 638 sb->s_blocksize - offset : toread; 639 640 tmp_bh.b_state = 0; 641 tmp_bh.b_size = 1 << inode->i_blkbits; 642 err = jfs_get_block(inode, blk, &tmp_bh, 0); 643 if (err) 644 return err; 645 if (!buffer_mapped(&tmp_bh)) /* A hole? */ 646 memset(data, 0, tocopy); 647 else { 648 bh = sb_bread(sb, tmp_bh.b_blocknr); 649 if (!bh) 650 return -EIO; 651 memcpy(data, bh->b_data+offset, tocopy); 652 brelse(bh); 653 } 654 offset = 0; 655 toread -= tocopy; 656 data += tocopy; 657 blk++; 658 } 659 return len; 660 } 661 662 /* Write to quotafile */ 663 static ssize_t jfs_quota_write(struct super_block *sb, int type, 664 const char *data, size_t len, loff_t off) 665 { 666 struct inode *inode = sb_dqopt(sb)->files[type]; 667 sector_t blk = off >> sb->s_blocksize_bits; 668 int err = 0; 669 int offset = off & (sb->s_blocksize - 1); 670 int tocopy; 671 size_t towrite = len; 672 struct buffer_head tmp_bh; 673 struct buffer_head *bh; 674 675 mutex_lock(&inode->i_mutex); 676 while (towrite > 0) { 677 tocopy = sb->s_blocksize - offset < towrite ? 678 sb->s_blocksize - offset : towrite; 679 680 tmp_bh.b_state = 0; 681 tmp_bh.b_size = 1 << inode->i_blkbits; 682 err = jfs_get_block(inode, blk, &tmp_bh, 1); 683 if (err) 684 goto out; 685 if (offset || tocopy != sb->s_blocksize) 686 bh = sb_bread(sb, tmp_bh.b_blocknr); 687 else 688 bh = sb_getblk(sb, tmp_bh.b_blocknr); 689 if (!bh) { 690 err = -EIO; 691 goto out; 692 } 693 lock_buffer(bh); 694 memcpy(bh->b_data+offset, data, tocopy); 695 flush_dcache_page(bh->b_page); 696 set_buffer_uptodate(bh); 697 mark_buffer_dirty(bh); 698 unlock_buffer(bh); 699 brelse(bh); 700 offset = 0; 701 towrite -= tocopy; 702 data += tocopy; 703 blk++; 704 } 705 out: 706 if (len == towrite) 707 return err; 708 if (inode->i_size < off+len-towrite) 709 i_size_write(inode, off+len-towrite); 710 inode->i_version++; 711 inode->i_mtime = inode->i_ctime = CURRENT_TIME; 712 mark_inode_dirty(inode); 713 mutex_unlock(&inode->i_mutex); 714 return len - towrite; 715 } 716 717 #endif 718 719 static struct super_operations jfs_super_operations = { 720 .alloc_inode = jfs_alloc_inode, 721 .destroy_inode = jfs_destroy_inode, 722 .read_inode = jfs_read_inode, 723 .dirty_inode = jfs_dirty_inode, 724 .write_inode = jfs_write_inode, 725 .delete_inode = jfs_delete_inode, 726 .put_super = jfs_put_super, 727 .sync_fs = jfs_sync_fs, 728 .write_super_lockfs = jfs_write_super_lockfs, 729 .unlockfs = jfs_unlockfs, 730 .statfs = jfs_statfs, 731 .remount_fs = jfs_remount, 732 .show_options = jfs_show_options, 733 #ifdef CONFIG_QUOTA 734 .quota_read = jfs_quota_read, 735 .quota_write = jfs_quota_write, 736 #endif 737 }; 738 739 static struct export_operations jfs_export_operations = { 740 .get_parent = jfs_get_parent, 741 }; 742 743 static struct file_system_type jfs_fs_type = { 744 .owner = THIS_MODULE, 745 .name = "jfs", 746 .get_sb = jfs_get_sb, 747 .kill_sb = kill_block_super, 748 .fs_flags = FS_REQUIRES_DEV, 749 }; 750 751 static void init_once(void *foo, struct kmem_cache * cachep, unsigned long flags) 752 { 753 struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo; 754 755 if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) == 756 SLAB_CTOR_CONSTRUCTOR) { 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 } 771 772 static int __init init_jfs_fs(void) 773 { 774 int i; 775 int rc; 776 777 jfs_inode_cachep = 778 kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0, 779 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, 780 init_once, NULL); 781 if (jfs_inode_cachep == NULL) 782 return -ENOMEM; 783 784 /* 785 * Metapage initialization 786 */ 787 rc = metapage_init(); 788 if (rc) { 789 jfs_err("metapage_init failed w/rc = %d", rc); 790 goto free_slab; 791 } 792 793 /* 794 * Transaction Manager initialization 795 */ 796 rc = txInit(); 797 if (rc) { 798 jfs_err("txInit failed w/rc = %d", rc); 799 goto free_metapage; 800 } 801 802 /* 803 * I/O completion thread (endio) 804 */ 805 jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO"); 806 if (IS_ERR(jfsIOthread)) { 807 rc = PTR_ERR(jfsIOthread); 808 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 809 goto end_txmngr; 810 } 811 812 if (commit_threads < 1) 813 commit_threads = num_online_cpus(); 814 if (commit_threads > MAX_COMMIT_THREADS) 815 commit_threads = MAX_COMMIT_THREADS; 816 817 for (i = 0; i < commit_threads; i++) { 818 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, "jfsCommit"); 819 if (IS_ERR(jfsCommitThread[i])) { 820 rc = PTR_ERR(jfsCommitThread[i]); 821 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 822 commit_threads = i; 823 goto kill_committask; 824 } 825 } 826 827 jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync"); 828 if (IS_ERR(jfsSyncThread)) { 829 rc = PTR_ERR(jfsSyncThread); 830 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 831 goto kill_committask; 832 } 833 834 #ifdef PROC_FS_JFS 835 jfs_proc_init(); 836 #endif 837 838 return register_filesystem(&jfs_fs_type); 839 840 kill_committask: 841 for (i = 0; i < commit_threads; i++) 842 kthread_stop(jfsCommitThread[i]); 843 kthread_stop(jfsIOthread); 844 end_txmngr: 845 txExit(); 846 free_metapage: 847 metapage_exit(); 848 free_slab: 849 kmem_cache_destroy(jfs_inode_cachep); 850 return rc; 851 } 852 853 static void __exit exit_jfs_fs(void) 854 { 855 int i; 856 857 jfs_info("exit_jfs_fs called"); 858 859 txExit(); 860 metapage_exit(); 861 862 kthread_stop(jfsIOthread); 863 for (i = 0; i < commit_threads; i++) 864 kthread_stop(jfsCommitThread[i]); 865 kthread_stop(jfsSyncThread); 866 #ifdef PROC_FS_JFS 867 jfs_proc_clean(); 868 #endif 869 unregister_filesystem(&jfs_fs_type); 870 kmem_cache_destroy(jfs_inode_cachep); 871 } 872 873 module_init(init_jfs_fs) 874 module_exit(exit_jfs_fs) 875