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); 131 132 #ifdef CONFIG_JFS_POSIX_ACL 133 if (ji->i_acl != JFS_ACL_NOT_CACHED) { 134 posix_acl_release(ji->i_acl); 135 ji->i_acl = JFS_ACL_NOT_CACHED; 136 } 137 if (ji->i_default_acl != JFS_ACL_NOT_CACHED) { 138 posix_acl_release(ji->i_default_acl); 139 ji->i_default_acl = JFS_ACL_NOT_CACHED; 140 } 141 #endif 142 143 kmem_cache_free(jfs_inode_cachep, ji); 144 } 145 146 static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf) 147 { 148 struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb); 149 s64 maxinodes; 150 struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap; 151 152 jfs_info("In jfs_statfs"); 153 buf->f_type = JFS_SUPER_MAGIC; 154 buf->f_bsize = sbi->bsize; 155 buf->f_blocks = sbi->bmap->db_mapsize; 156 buf->f_bfree = sbi->bmap->db_nfree; 157 buf->f_bavail = sbi->bmap->db_nfree; 158 /* 159 * If we really return the number of allocated & free inodes, some 160 * applications will fail because they won't see enough free inodes. 161 * We'll try to calculate some guess as to how may inodes we can 162 * really allocate 163 * 164 * buf->f_files = atomic_read(&imap->im_numinos); 165 * buf->f_ffree = atomic_read(&imap->im_numfree); 166 */ 167 maxinodes = min((s64) atomic_read(&imap->im_numinos) + 168 ((sbi->bmap->db_nfree >> imap->im_l2nbperiext) 169 << L2INOSPEREXT), (s64) 0xffffffffLL); 170 buf->f_files = maxinodes; 171 buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) - 172 atomic_read(&imap->im_numfree)); 173 buf->f_fsid.val[0] = (u32)crc32_le(0, sbi->uuid, sizeof(sbi->uuid)/2); 174 buf->f_fsid.val[1] = (u32)crc32_le(0, sbi->uuid + sizeof(sbi->uuid)/2, 175 sizeof(sbi->uuid)/2); 176 177 buf->f_namelen = JFS_NAME_MAX; 178 return 0; 179 } 180 181 static void jfs_put_super(struct super_block *sb) 182 { 183 struct jfs_sb_info *sbi = JFS_SBI(sb); 184 int rc; 185 186 jfs_info("In jfs_put_super"); 187 188 lock_kernel(); 189 190 rc = jfs_umount(sb); 191 if (rc) 192 jfs_err("jfs_umount failed with return code %d", rc); 193 if (sbi->nls_tab) 194 unload_nls(sbi->nls_tab); 195 sbi->nls_tab = NULL; 196 197 truncate_inode_pages(sbi->direct_inode->i_mapping, 0); 198 iput(sbi->direct_inode); 199 sbi->direct_inode = NULL; 200 201 kfree(sbi); 202 203 unlock_kernel(); 204 } 205 206 enum { 207 Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize, 208 Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota, 209 Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask 210 }; 211 212 static const match_table_t tokens = { 213 {Opt_integrity, "integrity"}, 214 {Opt_nointegrity, "nointegrity"}, 215 {Opt_iocharset, "iocharset=%s"}, 216 {Opt_resize, "resize=%u"}, 217 {Opt_resize_nosize, "resize"}, 218 {Opt_errors, "errors=%s"}, 219 {Opt_ignore, "noquota"}, 220 {Opt_ignore, "quota"}, 221 {Opt_usrquota, "usrquota"}, 222 {Opt_grpquota, "grpquota"}, 223 {Opt_uid, "uid=%u"}, 224 {Opt_gid, "gid=%u"}, 225 {Opt_umask, "umask=%u"}, 226 {Opt_err, NULL} 227 }; 228 229 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize, 230 int *flag) 231 { 232 void *nls_map = (void *)-1; /* -1: no change; NULL: none */ 233 char *p; 234 struct jfs_sb_info *sbi = JFS_SBI(sb); 235 236 *newLVSize = 0; 237 238 if (!options) 239 return 1; 240 241 while ((p = strsep(&options, ",")) != NULL) { 242 substring_t args[MAX_OPT_ARGS]; 243 int token; 244 if (!*p) 245 continue; 246 247 token = match_token(p, tokens, args); 248 switch (token) { 249 case Opt_integrity: 250 *flag &= ~JFS_NOINTEGRITY; 251 break; 252 case Opt_nointegrity: 253 *flag |= JFS_NOINTEGRITY; 254 break; 255 case Opt_ignore: 256 /* Silently ignore the quota options */ 257 /* Don't do anything ;-) */ 258 break; 259 case Opt_iocharset: 260 if (nls_map && nls_map != (void *) -1) 261 unload_nls(nls_map); 262 if (!strcmp(args[0].from, "none")) 263 nls_map = NULL; 264 else { 265 nls_map = load_nls(args[0].from); 266 if (!nls_map) { 267 printk(KERN_ERR 268 "JFS: charset not found\n"); 269 goto cleanup; 270 } 271 } 272 break; 273 case Opt_resize: 274 { 275 char *resize = args[0].from; 276 *newLVSize = simple_strtoull(resize, &resize, 0); 277 break; 278 } 279 case Opt_resize_nosize: 280 { 281 *newLVSize = sb->s_bdev->bd_inode->i_size >> 282 sb->s_blocksize_bits; 283 if (*newLVSize == 0) 284 printk(KERN_ERR 285 "JFS: Cannot determine volume size\n"); 286 break; 287 } 288 case Opt_errors: 289 { 290 char *errors = args[0].from; 291 if (!errors || !*errors) 292 goto cleanup; 293 if (!strcmp(errors, "continue")) { 294 *flag &= ~JFS_ERR_REMOUNT_RO; 295 *flag &= ~JFS_ERR_PANIC; 296 *flag |= JFS_ERR_CONTINUE; 297 } else if (!strcmp(errors, "remount-ro")) { 298 *flag &= ~JFS_ERR_CONTINUE; 299 *flag &= ~JFS_ERR_PANIC; 300 *flag |= JFS_ERR_REMOUNT_RO; 301 } else if (!strcmp(errors, "panic")) { 302 *flag &= ~JFS_ERR_CONTINUE; 303 *flag &= ~JFS_ERR_REMOUNT_RO; 304 *flag |= JFS_ERR_PANIC; 305 } else { 306 printk(KERN_ERR 307 "JFS: %s is an invalid error handler\n", 308 errors); 309 goto cleanup; 310 } 311 break; 312 } 313 314 #ifdef CONFIG_QUOTA 315 case Opt_quota: 316 case Opt_usrquota: 317 *flag |= JFS_USRQUOTA; 318 break; 319 case Opt_grpquota: 320 *flag |= JFS_GRPQUOTA; 321 break; 322 #else 323 case Opt_usrquota: 324 case Opt_grpquota: 325 case Opt_quota: 326 printk(KERN_ERR 327 "JFS: quota operations not supported\n"); 328 break; 329 #endif 330 case Opt_uid: 331 { 332 char *uid = args[0].from; 333 sbi->uid = simple_strtoul(uid, &uid, 0); 334 break; 335 } 336 case Opt_gid: 337 { 338 char *gid = args[0].from; 339 sbi->gid = simple_strtoul(gid, &gid, 0); 340 break; 341 } 342 case Opt_umask: 343 { 344 char *umask = args[0].from; 345 sbi->umask = simple_strtoul(umask, &umask, 8); 346 if (sbi->umask & ~0777) { 347 printk(KERN_ERR 348 "JFS: Invalid value of umask\n"); 349 goto cleanup; 350 } 351 break; 352 } 353 default: 354 printk("jfs: Unrecognized mount option \"%s\" " 355 " or missing value\n", p); 356 goto cleanup; 357 } 358 } 359 360 if (nls_map != (void *) -1) { 361 /* Discard old (if remount) */ 362 if (sbi->nls_tab) 363 unload_nls(sbi->nls_tab); 364 sbi->nls_tab = nls_map; 365 } 366 return 1; 367 368 cleanup: 369 if (nls_map && nls_map != (void *) -1) 370 unload_nls(nls_map); 371 return 0; 372 } 373 374 static int jfs_remount(struct super_block *sb, int *flags, char *data) 375 { 376 s64 newLVSize = 0; 377 int rc = 0; 378 int flag = JFS_SBI(sb)->flag; 379 int ret; 380 381 if (!parse_options(data, sb, &newLVSize, &flag)) { 382 return -EINVAL; 383 } 384 lock_kernel(); 385 if (newLVSize) { 386 if (sb->s_flags & MS_RDONLY) { 387 printk(KERN_ERR 388 "JFS: resize requires volume to be mounted read-write\n"); 389 unlock_kernel(); 390 return -EROFS; 391 } 392 rc = jfs_extendfs(sb, newLVSize, 0); 393 if (rc) { 394 unlock_kernel(); 395 return rc; 396 } 397 } 398 399 if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) { 400 /* 401 * Invalidate any previously read metadata. fsck may have 402 * changed the on-disk data since we mounted r/o 403 */ 404 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0); 405 406 JFS_SBI(sb)->flag = flag; 407 ret = jfs_mount_rw(sb, 1); 408 unlock_kernel(); 409 return ret; 410 } 411 if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) { 412 rc = jfs_umount_rw(sb); 413 JFS_SBI(sb)->flag = flag; 414 unlock_kernel(); 415 return rc; 416 } 417 if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY)) 418 if (!(sb->s_flags & MS_RDONLY)) { 419 rc = jfs_umount_rw(sb); 420 if (rc) { 421 unlock_kernel(); 422 return rc; 423 } 424 JFS_SBI(sb)->flag = flag; 425 ret = jfs_mount_rw(sb, 1); 426 unlock_kernel(); 427 return ret; 428 } 429 JFS_SBI(sb)->flag = flag; 430 431 unlock_kernel(); 432 return 0; 433 } 434 435 static int jfs_fill_super(struct super_block *sb, void *data, int silent) 436 { 437 struct jfs_sb_info *sbi; 438 struct inode *inode; 439 int rc; 440 s64 newLVSize = 0; 441 int flag, ret = -EINVAL; 442 443 jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags); 444 445 if (!new_valid_dev(sb->s_bdev->bd_dev)) 446 return -EOVERFLOW; 447 448 sbi = kzalloc(sizeof (struct jfs_sb_info), GFP_KERNEL); 449 if (!sbi) 450 return -ENOMEM; 451 sb->s_fs_info = sbi; 452 sbi->sb = sb; 453 sbi->uid = sbi->gid = sbi->umask = -1; 454 455 /* initialize the mount flag and determine the default error handler */ 456 flag = JFS_ERR_REMOUNT_RO; 457 458 if (!parse_options((char *) data, sb, &newLVSize, &flag)) { 459 kfree(sbi); 460 return -EINVAL; 461 } 462 sbi->flag = flag; 463 464 #ifdef CONFIG_JFS_POSIX_ACL 465 sb->s_flags |= MS_POSIXACL; 466 #endif 467 468 if (newLVSize) { 469 printk(KERN_ERR "resize option for remount only\n"); 470 return -EINVAL; 471 } 472 473 /* 474 * Initialize blocksize to 4K. 475 */ 476 sb_set_blocksize(sb, PSIZE); 477 478 /* 479 * Set method vectors. 480 */ 481 sb->s_op = &jfs_super_operations; 482 sb->s_export_op = &jfs_export_operations; 483 484 /* 485 * Initialize direct-mapping inode/address-space 486 */ 487 inode = new_inode(sb); 488 if (inode == NULL) { 489 ret = -ENOMEM; 490 goto out_kfree; 491 } 492 inode->i_ino = 0; 493 inode->i_nlink = 1; 494 inode->i_size = sb->s_bdev->bd_inode->i_size; 495 inode->i_mapping->a_ops = &jfs_metapage_aops; 496 insert_inode_hash(inode); 497 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS); 498 499 sbi->direct_inode = inode; 500 501 rc = jfs_mount(sb); 502 if (rc) { 503 if (!silent) { 504 jfs_err("jfs_mount failed w/return code = %d", rc); 505 } 506 goto out_mount_failed; 507 } 508 if (sb->s_flags & MS_RDONLY) 509 sbi->log = NULL; 510 else { 511 rc = jfs_mount_rw(sb, 0); 512 if (rc) { 513 if (!silent) { 514 jfs_err("jfs_mount_rw failed, return code = %d", 515 rc); 516 } 517 goto out_no_rw; 518 } 519 } 520 521 sb->s_magic = JFS_SUPER_MAGIC; 522 523 inode = jfs_iget(sb, ROOT_I); 524 if (IS_ERR(inode)) { 525 ret = PTR_ERR(inode); 526 goto out_no_rw; 527 } 528 sb->s_root = d_alloc_root(inode); 529 if (!sb->s_root) 530 goto out_no_root; 531 532 if (sbi->mntflag & JFS_OS2) 533 sb->s_root->d_op = &jfs_ci_dentry_operations; 534 535 /* logical blocks are represented by 40 bits in pxd_t, etc. */ 536 sb->s_maxbytes = ((u64) sb->s_blocksize) << 40; 537 #if BITS_PER_LONG == 32 538 /* 539 * Page cache is indexed by long. 540 * I would use MAX_LFS_FILESIZE, but it's only half as big 541 */ 542 sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, sb->s_maxbytes); 543 #endif 544 sb->s_time_gran = 1; 545 return 0; 546 547 out_no_root: 548 jfs_err("jfs_read_super: get root dentry failed"); 549 iput(inode); 550 551 out_no_rw: 552 rc = jfs_umount(sb); 553 if (rc) { 554 jfs_err("jfs_umount failed with return code %d", rc); 555 } 556 out_mount_failed: 557 filemap_write_and_wait(sbi->direct_inode->i_mapping); 558 truncate_inode_pages(sbi->direct_inode->i_mapping, 0); 559 make_bad_inode(sbi->direct_inode); 560 iput(sbi->direct_inode); 561 sbi->direct_inode = NULL; 562 out_kfree: 563 if (sbi->nls_tab) 564 unload_nls(sbi->nls_tab); 565 kfree(sbi); 566 return ret; 567 } 568 569 static int jfs_freeze(struct super_block *sb) 570 { 571 struct jfs_sb_info *sbi = JFS_SBI(sb); 572 struct jfs_log *log = sbi->log; 573 574 if (!(sb->s_flags & MS_RDONLY)) { 575 txQuiesce(sb); 576 lmLogShutdown(log); 577 updateSuper(sb, FM_CLEAN); 578 } 579 return 0; 580 } 581 582 static int jfs_unfreeze(struct super_block *sb) 583 { 584 struct jfs_sb_info *sbi = JFS_SBI(sb); 585 struct jfs_log *log = sbi->log; 586 int rc = 0; 587 588 if (!(sb->s_flags & MS_RDONLY)) { 589 updateSuper(sb, FM_MOUNT); 590 if ((rc = lmLogInit(log))) 591 jfs_err("jfs_unlock failed with return code %d", rc); 592 else 593 txResume(sb); 594 } 595 return 0; 596 } 597 598 static int jfs_get_sb(struct file_system_type *fs_type, 599 int flags, const char *dev_name, void *data, struct vfsmount *mnt) 600 { 601 return get_sb_bdev(fs_type, flags, dev_name, data, jfs_fill_super, 602 mnt); 603 } 604 605 static int jfs_sync_fs(struct super_block *sb, int wait) 606 { 607 struct jfs_log *log = JFS_SBI(sb)->log; 608 609 /* log == NULL indicates read-only mount */ 610 if (log) { 611 jfs_flush_journal(log, wait); 612 jfs_syncpt(log, 0); 613 } 614 615 return 0; 616 } 617 618 static int jfs_show_options(struct seq_file *seq, struct vfsmount *vfs) 619 { 620 struct jfs_sb_info *sbi = JFS_SBI(vfs->mnt_sb); 621 622 if (sbi->uid != -1) 623 seq_printf(seq, ",uid=%d", sbi->uid); 624 if (sbi->gid != -1) 625 seq_printf(seq, ",gid=%d", sbi->gid); 626 if (sbi->umask != -1) 627 seq_printf(seq, ",umask=%03o", sbi->umask); 628 if (sbi->flag & JFS_NOINTEGRITY) 629 seq_puts(seq, ",nointegrity"); 630 if (sbi->nls_tab) 631 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset); 632 if (sbi->flag & JFS_ERR_CONTINUE) 633 seq_printf(seq, ",errors=continue"); 634 if (sbi->flag & JFS_ERR_PANIC) 635 seq_printf(seq, ",errors=panic"); 636 637 #ifdef CONFIG_QUOTA 638 if (sbi->flag & JFS_USRQUOTA) 639 seq_puts(seq, ",usrquota"); 640 641 if (sbi->flag & JFS_GRPQUOTA) 642 seq_puts(seq, ",grpquota"); 643 #endif 644 645 return 0; 646 } 647 648 #ifdef CONFIG_QUOTA 649 650 /* Read data from quotafile - avoid pagecache and such because we cannot afford 651 * acquiring the locks... As quota files are never truncated and quota code 652 * itself serializes the operations (and noone else should touch the files) 653 * we don't have to be afraid of races */ 654 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data, 655 size_t len, loff_t off) 656 { 657 struct inode *inode = sb_dqopt(sb)->files[type]; 658 sector_t blk = off >> sb->s_blocksize_bits; 659 int err = 0; 660 int offset = off & (sb->s_blocksize - 1); 661 int tocopy; 662 size_t toread; 663 struct buffer_head tmp_bh; 664 struct buffer_head *bh; 665 loff_t i_size = i_size_read(inode); 666 667 if (off > i_size) 668 return 0; 669 if (off+len > i_size) 670 len = i_size-off; 671 toread = len; 672 while (toread > 0) { 673 tocopy = sb->s_blocksize - offset < toread ? 674 sb->s_blocksize - offset : toread; 675 676 tmp_bh.b_state = 0; 677 tmp_bh.b_size = 1 << inode->i_blkbits; 678 err = jfs_get_block(inode, blk, &tmp_bh, 0); 679 if (err) 680 return err; 681 if (!buffer_mapped(&tmp_bh)) /* A hole? */ 682 memset(data, 0, tocopy); 683 else { 684 bh = sb_bread(sb, tmp_bh.b_blocknr); 685 if (!bh) 686 return -EIO; 687 memcpy(data, bh->b_data+offset, tocopy); 688 brelse(bh); 689 } 690 offset = 0; 691 toread -= tocopy; 692 data += tocopy; 693 blk++; 694 } 695 return len; 696 } 697 698 /* Write to quotafile */ 699 static ssize_t jfs_quota_write(struct super_block *sb, int type, 700 const char *data, size_t len, loff_t off) 701 { 702 struct inode *inode = sb_dqopt(sb)->files[type]; 703 sector_t blk = off >> sb->s_blocksize_bits; 704 int err = 0; 705 int offset = off & (sb->s_blocksize - 1); 706 int tocopy; 707 size_t towrite = len; 708 struct buffer_head tmp_bh; 709 struct buffer_head *bh; 710 711 mutex_lock(&inode->i_mutex); 712 while (towrite > 0) { 713 tocopy = sb->s_blocksize - offset < towrite ? 714 sb->s_blocksize - offset : towrite; 715 716 tmp_bh.b_state = 0; 717 tmp_bh.b_size = 1 << inode->i_blkbits; 718 err = jfs_get_block(inode, blk, &tmp_bh, 1); 719 if (err) 720 goto out; 721 if (offset || tocopy != sb->s_blocksize) 722 bh = sb_bread(sb, tmp_bh.b_blocknr); 723 else 724 bh = sb_getblk(sb, tmp_bh.b_blocknr); 725 if (!bh) { 726 err = -EIO; 727 goto out; 728 } 729 lock_buffer(bh); 730 memcpy(bh->b_data+offset, data, tocopy); 731 flush_dcache_page(bh->b_page); 732 set_buffer_uptodate(bh); 733 mark_buffer_dirty(bh); 734 unlock_buffer(bh); 735 brelse(bh); 736 offset = 0; 737 towrite -= tocopy; 738 data += tocopy; 739 blk++; 740 } 741 out: 742 if (len == towrite) { 743 mutex_unlock(&inode->i_mutex); 744 return err; 745 } 746 if (inode->i_size < off+len-towrite) 747 i_size_write(inode, off+len-towrite); 748 inode->i_version++; 749 inode->i_mtime = inode->i_ctime = CURRENT_TIME; 750 mark_inode_dirty(inode); 751 mutex_unlock(&inode->i_mutex); 752 return len - towrite; 753 } 754 755 #endif 756 757 static const struct super_operations jfs_super_operations = { 758 .alloc_inode = jfs_alloc_inode, 759 .destroy_inode = jfs_destroy_inode, 760 .dirty_inode = jfs_dirty_inode, 761 .write_inode = jfs_write_inode, 762 .delete_inode = jfs_delete_inode, 763 .put_super = jfs_put_super, 764 .sync_fs = jfs_sync_fs, 765 .freeze_fs = jfs_freeze, 766 .unfreeze_fs = jfs_unfreeze, 767 .statfs = jfs_statfs, 768 .remount_fs = jfs_remount, 769 .show_options = jfs_show_options, 770 #ifdef CONFIG_QUOTA 771 .quota_read = jfs_quota_read, 772 .quota_write = jfs_quota_write, 773 #endif 774 }; 775 776 static const struct export_operations jfs_export_operations = { 777 .fh_to_dentry = jfs_fh_to_dentry, 778 .fh_to_parent = jfs_fh_to_parent, 779 .get_parent = jfs_get_parent, 780 }; 781 782 static struct file_system_type jfs_fs_type = { 783 .owner = THIS_MODULE, 784 .name = "jfs", 785 .get_sb = jfs_get_sb, 786 .kill_sb = kill_block_super, 787 .fs_flags = FS_REQUIRES_DEV, 788 }; 789 790 static void init_once(void *foo) 791 { 792 struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo; 793 794 memset(jfs_ip, 0, sizeof(struct jfs_inode_info)); 795 INIT_LIST_HEAD(&jfs_ip->anon_inode_list); 796 init_rwsem(&jfs_ip->rdwrlock); 797 mutex_init(&jfs_ip->commit_mutex); 798 init_rwsem(&jfs_ip->xattr_sem); 799 spin_lock_init(&jfs_ip->ag_lock); 800 jfs_ip->active_ag = -1; 801 #ifdef CONFIG_JFS_POSIX_ACL 802 jfs_ip->i_acl = JFS_ACL_NOT_CACHED; 803 jfs_ip->i_default_acl = JFS_ACL_NOT_CACHED; 804 #endif 805 inode_init_once(&jfs_ip->vfs_inode); 806 } 807 808 static int __init init_jfs_fs(void) 809 { 810 int i; 811 int rc; 812 813 jfs_inode_cachep = 814 kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0, 815 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, 816 init_once); 817 if (jfs_inode_cachep == NULL) 818 return -ENOMEM; 819 820 /* 821 * Metapage initialization 822 */ 823 rc = metapage_init(); 824 if (rc) { 825 jfs_err("metapage_init failed w/rc = %d", rc); 826 goto free_slab; 827 } 828 829 /* 830 * Transaction Manager initialization 831 */ 832 rc = txInit(); 833 if (rc) { 834 jfs_err("txInit failed w/rc = %d", rc); 835 goto free_metapage; 836 } 837 838 /* 839 * I/O completion thread (endio) 840 */ 841 jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO"); 842 if (IS_ERR(jfsIOthread)) { 843 rc = PTR_ERR(jfsIOthread); 844 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 845 goto end_txmngr; 846 } 847 848 if (commit_threads < 1) 849 commit_threads = num_online_cpus(); 850 if (commit_threads > MAX_COMMIT_THREADS) 851 commit_threads = MAX_COMMIT_THREADS; 852 853 for (i = 0; i < commit_threads; i++) { 854 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, "jfsCommit"); 855 if (IS_ERR(jfsCommitThread[i])) { 856 rc = PTR_ERR(jfsCommitThread[i]); 857 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 858 commit_threads = i; 859 goto kill_committask; 860 } 861 } 862 863 jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync"); 864 if (IS_ERR(jfsSyncThread)) { 865 rc = PTR_ERR(jfsSyncThread); 866 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 867 goto kill_committask; 868 } 869 870 #ifdef PROC_FS_JFS 871 jfs_proc_init(); 872 #endif 873 874 return register_filesystem(&jfs_fs_type); 875 876 kill_committask: 877 for (i = 0; i < commit_threads; i++) 878 kthread_stop(jfsCommitThread[i]); 879 kthread_stop(jfsIOthread); 880 end_txmngr: 881 txExit(); 882 free_metapage: 883 metapage_exit(); 884 free_slab: 885 kmem_cache_destroy(jfs_inode_cachep); 886 return rc; 887 } 888 889 static void __exit exit_jfs_fs(void) 890 { 891 int i; 892 893 jfs_info("exit_jfs_fs called"); 894 895 txExit(); 896 metapage_exit(); 897 898 kthread_stop(jfsIOthread); 899 for (i = 0; i < commit_threads; i++) 900 kthread_stop(jfsCommitThread[i]); 901 kthread_stop(jfsSyncThread); 902 #ifdef PROC_FS_JFS 903 jfs_proc_clean(); 904 #endif 905 unregister_filesystem(&jfs_fs_type); 906 kmem_cache_destroy(jfs_inode_cachep); 907 } 908 909 module_init(init_jfs_fs) 910 module_exit(exit_jfs_fs) 911