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