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 int jfs_statfs(struct dentry *dentry, struct kstatfs *buf) 136 { 137 struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb); 138 s64 maxinodes; 139 struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap; 140 141 jfs_info("In jfs_statfs"); 142 buf->f_type = JFS_SUPER_MAGIC; 143 buf->f_bsize = sbi->bsize; 144 buf->f_blocks = sbi->bmap->db_mapsize; 145 buf->f_bfree = sbi->bmap->db_nfree; 146 buf->f_bavail = sbi->bmap->db_nfree; 147 /* 148 * If we really return the number of allocated & free inodes, some 149 * applications will fail because they won't see enough free inodes. 150 * We'll try to calculate some guess as to how may inodes we can 151 * really allocate 152 * 153 * buf->f_files = atomic_read(&imap->im_numinos); 154 * buf->f_ffree = atomic_read(&imap->im_numfree); 155 */ 156 maxinodes = min((s64) atomic_read(&imap->im_numinos) + 157 ((sbi->bmap->db_nfree >> imap->im_l2nbperiext) 158 << L2INOSPEREXT), (s64) 0xffffffffLL); 159 buf->f_files = maxinodes; 160 buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) - 161 atomic_read(&imap->im_numfree)); 162 buf->f_fsid.val[0] = (u32)crc32_le(0, sbi->uuid, sizeof(sbi->uuid)/2); 163 buf->f_fsid.val[1] = (u32)crc32_le(0, sbi->uuid + sizeof(sbi->uuid)/2, 164 sizeof(sbi->uuid)/2); 165 166 buf->f_namelen = JFS_NAME_MAX; 167 return 0; 168 } 169 170 static void jfs_put_super(struct super_block *sb) 171 { 172 struct jfs_sb_info *sbi = JFS_SBI(sb); 173 int rc; 174 175 jfs_info("In jfs_put_super"); 176 177 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); 178 179 lock_kernel(); 180 181 rc = jfs_umount(sb); 182 if (rc) 183 jfs_err("jfs_umount failed with return code %d", rc); 184 185 unload_nls(sbi->nls_tab); 186 187 truncate_inode_pages(sbi->direct_inode->i_mapping, 0); 188 iput(sbi->direct_inode); 189 190 kfree(sbi); 191 192 unlock_kernel(); 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 const 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 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 int ret; 368 369 if (!parse_options(data, sb, &newLVSize, &flag)) { 370 return -EINVAL; 371 } 372 lock_kernel(); 373 if (newLVSize) { 374 if (sb->s_flags & MS_RDONLY) { 375 printk(KERN_ERR 376 "JFS: resize requires volume to be mounted read-write\n"); 377 unlock_kernel(); 378 return -EROFS; 379 } 380 rc = jfs_extendfs(sb, newLVSize, 0); 381 if (rc) { 382 unlock_kernel(); 383 return rc; 384 } 385 } 386 387 if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) { 388 /* 389 * Invalidate any previously read metadata. fsck may have 390 * changed the on-disk data since we mounted r/o 391 */ 392 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0); 393 394 JFS_SBI(sb)->flag = flag; 395 ret = jfs_mount_rw(sb, 1); 396 397 /* mark the fs r/w for quota activity */ 398 sb->s_flags &= ~MS_RDONLY; 399 400 unlock_kernel(); 401 dquot_resume(sb, -1); 402 return ret; 403 } 404 if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) { 405 rc = dquot_suspend(sb, -1); 406 if (rc < 0) { 407 unlock_kernel(); 408 return rc; 409 } 410 rc = jfs_umount_rw(sb); 411 JFS_SBI(sb)->flag = flag; 412 unlock_kernel(); 413 return rc; 414 } 415 if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY)) 416 if (!(sb->s_flags & MS_RDONLY)) { 417 rc = jfs_umount_rw(sb); 418 if (rc) { 419 unlock_kernel(); 420 return rc; 421 } 422 JFS_SBI(sb)->flag = flag; 423 ret = jfs_mount_rw(sb, 1); 424 unlock_kernel(); 425 return ret; 426 } 427 JFS_SBI(sb)->flag = flag; 428 429 unlock_kernel(); 430 return 0; 431 } 432 433 static int jfs_fill_super(struct super_block *sb, void *data, int silent) 434 { 435 struct jfs_sb_info *sbi; 436 struct inode *inode; 437 int rc; 438 s64 newLVSize = 0; 439 int flag, ret = -EINVAL; 440 441 jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags); 442 443 if (!new_valid_dev(sb->s_bdev->bd_dev)) 444 return -EOVERFLOW; 445 446 sbi = kzalloc(sizeof (struct jfs_sb_info), GFP_KERNEL); 447 if (!sbi) 448 return -ENOMEM; 449 sb->s_fs_info = sbi; 450 sbi->sb = sb; 451 sbi->uid = sbi->gid = sbi->umask = -1; 452 453 /* initialize the mount flag and determine the default error handler */ 454 flag = JFS_ERR_REMOUNT_RO; 455 456 if (!parse_options((char *) data, sb, &newLVSize, &flag)) 457 goto out_kfree; 458 sbi->flag = flag; 459 460 #ifdef CONFIG_JFS_POSIX_ACL 461 sb->s_flags |= MS_POSIXACL; 462 #endif 463 464 if (newLVSize) { 465 printk(KERN_ERR "resize option for remount only\n"); 466 goto out_kfree; 467 } 468 469 /* 470 * Initialize blocksize to 4K. 471 */ 472 sb_set_blocksize(sb, PSIZE); 473 474 /* 475 * Set method vectors. 476 */ 477 sb->s_op = &jfs_super_operations; 478 sb->s_export_op = &jfs_export_operations; 479 #ifdef CONFIG_QUOTA 480 sb->dq_op = &dquot_operations; 481 sb->s_qcop = &dquot_quotactl_ops; 482 #endif 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_unload; 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, (u64)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_unload: 563 if (sbi->nls_tab) 564 unload_nls(sbi->nls_tab); 565 out_kfree: 566 kfree(sbi); 567 return ret; 568 } 569 570 static int jfs_freeze(struct super_block *sb) 571 { 572 struct jfs_sb_info *sbi = JFS_SBI(sb); 573 struct jfs_log *log = sbi->log; 574 575 if (!(sb->s_flags & MS_RDONLY)) { 576 txQuiesce(sb); 577 lmLogShutdown(log); 578 updateSuper(sb, FM_CLEAN); 579 } 580 return 0; 581 } 582 583 static int jfs_unfreeze(struct super_block *sb) 584 { 585 struct jfs_sb_info *sbi = JFS_SBI(sb); 586 struct jfs_log *log = sbi->log; 587 int rc = 0; 588 589 if (!(sb->s_flags & MS_RDONLY)) { 590 updateSuper(sb, FM_MOUNT); 591 if ((rc = lmLogInit(log))) 592 jfs_err("jfs_unlock failed with return code %d", rc); 593 else 594 txResume(sb); 595 } 596 return 0; 597 } 598 599 static int jfs_get_sb(struct file_system_type *fs_type, 600 int flags, const char *dev_name, void *data, struct vfsmount *mnt) 601 { 602 return get_sb_bdev(fs_type, flags, dev_name, data, jfs_fill_super, 603 mnt); 604 } 605 606 static int jfs_sync_fs(struct super_block *sb, int wait) 607 { 608 struct jfs_log *log = JFS_SBI(sb)->log; 609 610 /* log == NULL indicates read-only mount */ 611 if (log) { 612 jfs_flush_journal(log, wait); 613 jfs_syncpt(log, 0); 614 } 615 616 return 0; 617 } 618 619 static int jfs_show_options(struct seq_file *seq, struct vfsmount *vfs) 620 { 621 struct jfs_sb_info *sbi = JFS_SBI(vfs->mnt_sb); 622 623 if (sbi->uid != -1) 624 seq_printf(seq, ",uid=%d", sbi->uid); 625 if (sbi->gid != -1) 626 seq_printf(seq, ",gid=%d", sbi->gid); 627 if (sbi->umask != -1) 628 seq_printf(seq, ",umask=%03o", sbi->umask); 629 if (sbi->flag & JFS_NOINTEGRITY) 630 seq_puts(seq, ",nointegrity"); 631 if (sbi->nls_tab) 632 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset); 633 if (sbi->flag & JFS_ERR_CONTINUE) 634 seq_printf(seq, ",errors=continue"); 635 if (sbi->flag & JFS_ERR_PANIC) 636 seq_printf(seq, ",errors=panic"); 637 638 #ifdef CONFIG_QUOTA 639 if (sbi->flag & JFS_USRQUOTA) 640 seq_puts(seq, ",usrquota"); 641 642 if (sbi->flag & JFS_GRPQUOTA) 643 seq_puts(seq, ",grpquota"); 644 #endif 645 646 return 0; 647 } 648 649 #ifdef CONFIG_QUOTA 650 651 /* Read data from quotafile - avoid pagecache and such because we cannot afford 652 * acquiring the locks... As quota files are never truncated and quota code 653 * itself serializes the operations (and noone else should touch the files) 654 * we don't have to be afraid of races */ 655 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data, 656 size_t len, loff_t off) 657 { 658 struct inode *inode = sb_dqopt(sb)->files[type]; 659 sector_t blk = off >> sb->s_blocksize_bits; 660 int err = 0; 661 int offset = off & (sb->s_blocksize - 1); 662 int tocopy; 663 size_t toread; 664 struct buffer_head tmp_bh; 665 struct buffer_head *bh; 666 loff_t i_size = i_size_read(inode); 667 668 if (off > i_size) 669 return 0; 670 if (off+len > i_size) 671 len = i_size-off; 672 toread = len; 673 while (toread > 0) { 674 tocopy = sb->s_blocksize - offset < toread ? 675 sb->s_blocksize - offset : toread; 676 677 tmp_bh.b_state = 0; 678 tmp_bh.b_size = 1 << inode->i_blkbits; 679 err = jfs_get_block(inode, blk, &tmp_bh, 0); 680 if (err) 681 return err; 682 if (!buffer_mapped(&tmp_bh)) /* A hole? */ 683 memset(data, 0, tocopy); 684 else { 685 bh = sb_bread(sb, tmp_bh.b_blocknr); 686 if (!bh) 687 return -EIO; 688 memcpy(data, bh->b_data+offset, tocopy); 689 brelse(bh); 690 } 691 offset = 0; 692 toread -= tocopy; 693 data += tocopy; 694 blk++; 695 } 696 return len; 697 } 698 699 /* Write to quotafile */ 700 static ssize_t jfs_quota_write(struct super_block *sb, int type, 701 const char *data, size_t len, loff_t off) 702 { 703 struct inode *inode = sb_dqopt(sb)->files[type]; 704 sector_t blk = off >> sb->s_blocksize_bits; 705 int err = 0; 706 int offset = off & (sb->s_blocksize - 1); 707 int tocopy; 708 size_t towrite = len; 709 struct buffer_head tmp_bh; 710 struct buffer_head *bh; 711 712 mutex_lock(&inode->i_mutex); 713 while (towrite > 0) { 714 tocopy = sb->s_blocksize - offset < towrite ? 715 sb->s_blocksize - offset : towrite; 716 717 tmp_bh.b_state = 0; 718 tmp_bh.b_size = 1 << inode->i_blkbits; 719 err = jfs_get_block(inode, blk, &tmp_bh, 1); 720 if (err) 721 goto out; 722 if (offset || tocopy != sb->s_blocksize) 723 bh = sb_bread(sb, tmp_bh.b_blocknr); 724 else 725 bh = sb_getblk(sb, tmp_bh.b_blocknr); 726 if (!bh) { 727 err = -EIO; 728 goto out; 729 } 730 lock_buffer(bh); 731 memcpy(bh->b_data+offset, data, tocopy); 732 flush_dcache_page(bh->b_page); 733 set_buffer_uptodate(bh); 734 mark_buffer_dirty(bh); 735 unlock_buffer(bh); 736 brelse(bh); 737 offset = 0; 738 towrite -= tocopy; 739 data += tocopy; 740 blk++; 741 } 742 out: 743 if (len == towrite) { 744 mutex_unlock(&inode->i_mutex); 745 return err; 746 } 747 if (inode->i_size < off+len-towrite) 748 i_size_write(inode, off+len-towrite); 749 inode->i_version++; 750 inode->i_mtime = inode->i_ctime = CURRENT_TIME; 751 mark_inode_dirty(inode); 752 mutex_unlock(&inode->i_mutex); 753 return len - towrite; 754 } 755 756 #endif 757 758 static const struct super_operations jfs_super_operations = { 759 .alloc_inode = jfs_alloc_inode, 760 .destroy_inode = jfs_destroy_inode, 761 .dirty_inode = jfs_dirty_inode, 762 .write_inode = jfs_write_inode, 763 .evict_inode = jfs_evict_inode, 764 .put_super = jfs_put_super, 765 .sync_fs = jfs_sync_fs, 766 .freeze_fs = jfs_freeze, 767 .unfreeze_fs = jfs_unfreeze, 768 .statfs = jfs_statfs, 769 .remount_fs = jfs_remount, 770 .show_options = jfs_show_options, 771 #ifdef CONFIG_QUOTA 772 .quota_read = jfs_quota_read, 773 .quota_write = jfs_quota_write, 774 #endif 775 }; 776 777 static const struct export_operations jfs_export_operations = { 778 .fh_to_dentry = jfs_fh_to_dentry, 779 .fh_to_parent = jfs_fh_to_parent, 780 .get_parent = jfs_get_parent, 781 }; 782 783 static struct file_system_type jfs_fs_type = { 784 .owner = THIS_MODULE, 785 .name = "jfs", 786 .get_sb = jfs_get_sb, 787 .kill_sb = kill_block_super, 788 .fs_flags = FS_REQUIRES_DEV, 789 }; 790 791 static void init_once(void *foo) 792 { 793 struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo; 794 795 memset(jfs_ip, 0, sizeof(struct jfs_inode_info)); 796 INIT_LIST_HEAD(&jfs_ip->anon_inode_list); 797 init_rwsem(&jfs_ip->rdwrlock); 798 mutex_init(&jfs_ip->commit_mutex); 799 init_rwsem(&jfs_ip->xattr_sem); 800 spin_lock_init(&jfs_ip->ag_lock); 801 jfs_ip->active_ag = -1; 802 inode_init_once(&jfs_ip->vfs_inode); 803 } 804 805 static int __init init_jfs_fs(void) 806 { 807 int i; 808 int rc; 809 810 jfs_inode_cachep = 811 kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0, 812 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, 813 init_once); 814 if (jfs_inode_cachep == NULL) 815 return -ENOMEM; 816 817 /* 818 * Metapage initialization 819 */ 820 rc = metapage_init(); 821 if (rc) { 822 jfs_err("metapage_init failed w/rc = %d", rc); 823 goto free_slab; 824 } 825 826 /* 827 * Transaction Manager initialization 828 */ 829 rc = txInit(); 830 if (rc) { 831 jfs_err("txInit failed w/rc = %d", rc); 832 goto free_metapage; 833 } 834 835 /* 836 * I/O completion thread (endio) 837 */ 838 jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO"); 839 if (IS_ERR(jfsIOthread)) { 840 rc = PTR_ERR(jfsIOthread); 841 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 842 goto end_txmngr; 843 } 844 845 if (commit_threads < 1) 846 commit_threads = num_online_cpus(); 847 if (commit_threads > MAX_COMMIT_THREADS) 848 commit_threads = MAX_COMMIT_THREADS; 849 850 for (i = 0; i < commit_threads; i++) { 851 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, "jfsCommit"); 852 if (IS_ERR(jfsCommitThread[i])) { 853 rc = PTR_ERR(jfsCommitThread[i]); 854 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 855 commit_threads = i; 856 goto kill_committask; 857 } 858 } 859 860 jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync"); 861 if (IS_ERR(jfsSyncThread)) { 862 rc = PTR_ERR(jfsSyncThread); 863 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 864 goto kill_committask; 865 } 866 867 #ifdef PROC_FS_JFS 868 jfs_proc_init(); 869 #endif 870 871 return register_filesystem(&jfs_fs_type); 872 873 kill_committask: 874 for (i = 0; i < commit_threads; i++) 875 kthread_stop(jfsCommitThread[i]); 876 kthread_stop(jfsIOthread); 877 end_txmngr: 878 txExit(); 879 free_metapage: 880 metapage_exit(); 881 free_slab: 882 kmem_cache_destroy(jfs_inode_cachep); 883 return rc; 884 } 885 886 static void __exit exit_jfs_fs(void) 887 { 888 int i; 889 890 jfs_info("exit_jfs_fs called"); 891 892 txExit(); 893 metapage_exit(); 894 895 kthread_stop(jfsIOthread); 896 for (i = 0; i < commit_threads; i++) 897 kthread_stop(jfsCommitThread[i]); 898 kthread_stop(jfsSyncThread); 899 #ifdef PROC_FS_JFS 900 jfs_proc_clean(); 901 #endif 902 unregister_filesystem(&jfs_fs_type); 903 kmem_cache_destroy(jfs_inode_cachep); 904 } 905 906 module_init(init_jfs_fs) 907 module_exit(exit_jfs_fs) 908