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 36 #include "jfs_incore.h" 37 #include "jfs_filsys.h" 38 #include "jfs_inode.h" 39 #include "jfs_metapage.h" 40 #include "jfs_superblock.h" 41 #include "jfs_dmap.h" 42 #include "jfs_imap.h" 43 #include "jfs_acl.h" 44 #include "jfs_debug.h" 45 46 MODULE_DESCRIPTION("The Journaled Filesystem (JFS)"); 47 MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM"); 48 MODULE_LICENSE("GPL"); 49 50 static struct kmem_cache * jfs_inode_cachep; 51 52 static const struct super_operations jfs_super_operations; 53 static const struct export_operations jfs_export_operations; 54 static struct file_system_type jfs_fs_type; 55 56 #define MAX_COMMIT_THREADS 64 57 static int commit_threads = 0; 58 module_param(commit_threads, int, 0); 59 MODULE_PARM_DESC(commit_threads, "Number of commit threads"); 60 61 static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS]; 62 struct task_struct *jfsIOthread; 63 struct task_struct *jfsSyncThread; 64 65 #ifdef CONFIG_JFS_DEBUG 66 int jfsloglevel = JFS_LOGLEVEL_WARN; 67 module_param(jfsloglevel, int, 0644); 68 MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)"); 69 #endif 70 71 static void jfs_handle_error(struct super_block *sb) 72 { 73 struct jfs_sb_info *sbi = JFS_SBI(sb); 74 75 if (sb->s_flags & MS_RDONLY) 76 return; 77 78 updateSuper(sb, FM_DIRTY); 79 80 if (sbi->flag & JFS_ERR_PANIC) 81 panic("JFS (device %s): panic forced after error\n", 82 sb->s_id); 83 else if (sbi->flag & JFS_ERR_REMOUNT_RO) { 84 jfs_err("ERROR: (device %s): remounting filesystem " 85 "as read-only\n", 86 sb->s_id); 87 sb->s_flags |= MS_RDONLY; 88 } 89 90 /* nothing is done for continue beyond marking the superblock dirty */ 91 } 92 93 void jfs_error(struct super_block *sb, const char * function, ...) 94 { 95 static char error_buf[256]; 96 va_list args; 97 98 va_start(args, function); 99 vsnprintf(error_buf, sizeof(error_buf), function, args); 100 va_end(args); 101 102 printk(KERN_ERR "ERROR: (device %s): %s\n", sb->s_id, error_buf); 103 104 jfs_handle_error(sb); 105 } 106 107 static struct inode *jfs_alloc_inode(struct super_block *sb) 108 { 109 struct jfs_inode_info *jfs_inode; 110 111 jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS); 112 if (!jfs_inode) 113 return NULL; 114 return &jfs_inode->vfs_inode; 115 } 116 117 static void jfs_destroy_inode(struct inode *inode) 118 { 119 struct jfs_inode_info *ji = JFS_IP(inode); 120 121 BUG_ON(!list_empty(&ji->anon_inode_list)); 122 123 spin_lock_irq(&ji->ag_lock); 124 if (ji->active_ag != -1) { 125 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap; 126 atomic_dec(&bmap->db_active[ji->active_ag]); 127 ji->active_ag = -1; 128 } 129 spin_unlock_irq(&ji->ag_lock); 130 131 #ifdef CONFIG_JFS_POSIX_ACL 132 if (ji->i_acl != JFS_ACL_NOT_CACHED) { 133 posix_acl_release(ji->i_acl); 134 ji->i_acl = JFS_ACL_NOT_CACHED; 135 } 136 if (ji->i_default_acl != JFS_ACL_NOT_CACHED) { 137 posix_acl_release(ji->i_default_acl); 138 ji->i_default_acl = JFS_ACL_NOT_CACHED; 139 } 140 #endif 141 142 kmem_cache_free(jfs_inode_cachep, ji); 143 } 144 145 static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf) 146 { 147 struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb); 148 s64 maxinodes; 149 struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap; 150 151 jfs_info("In jfs_statfs"); 152 buf->f_type = JFS_SUPER_MAGIC; 153 buf->f_bsize = sbi->bsize; 154 buf->f_blocks = sbi->bmap->db_mapsize; 155 buf->f_bfree = sbi->bmap->db_nfree; 156 buf->f_bavail = sbi->bmap->db_nfree; 157 /* 158 * If we really return the number of allocated & free inodes, some 159 * applications will fail because they won't see enough free inodes. 160 * We'll try to calculate some guess as to how may inodes we can 161 * really allocate 162 * 163 * buf->f_files = atomic_read(&imap->im_numinos); 164 * buf->f_ffree = atomic_read(&imap->im_numfree); 165 */ 166 maxinodes = min((s64) atomic_read(&imap->im_numinos) + 167 ((sbi->bmap->db_nfree >> imap->im_l2nbperiext) 168 << L2INOSPEREXT), (s64) 0xffffffffLL); 169 buf->f_files = maxinodes; 170 buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) - 171 atomic_read(&imap->im_numfree)); 172 buf->f_fsid.val[0] = (u32)crc32_le(0, sbi->uuid, sizeof(sbi->uuid)/2); 173 buf->f_fsid.val[1] = (u32)crc32_le(0, sbi->uuid + sizeof(sbi->uuid)/2, 174 sizeof(sbi->uuid)/2); 175 176 buf->f_namelen = JFS_NAME_MAX; 177 return 0; 178 } 179 180 static void jfs_put_super(struct super_block *sb) 181 { 182 struct jfs_sb_info *sbi = JFS_SBI(sb); 183 int rc; 184 185 jfs_info("In jfs_put_super"); 186 rc = jfs_umount(sb); 187 if (rc) 188 jfs_err("jfs_umount failed with return code %d", rc); 189 if (sbi->nls_tab) 190 unload_nls(sbi->nls_tab); 191 sbi->nls_tab = NULL; 192 193 truncate_inode_pages(sbi->direct_inode->i_mapping, 0); 194 iput(sbi->direct_inode); 195 sbi->direct_inode = NULL; 196 197 kfree(sbi); 198 } 199 200 enum { 201 Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize, 202 Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota, 203 Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask 204 }; 205 206 static const match_table_t tokens = { 207 {Opt_integrity, "integrity"}, 208 {Opt_nointegrity, "nointegrity"}, 209 {Opt_iocharset, "iocharset=%s"}, 210 {Opt_resize, "resize=%u"}, 211 {Opt_resize_nosize, "resize"}, 212 {Opt_errors, "errors=%s"}, 213 {Opt_ignore, "noquota"}, 214 {Opt_ignore, "quota"}, 215 {Opt_usrquota, "usrquota"}, 216 {Opt_grpquota, "grpquota"}, 217 {Opt_uid, "uid=%u"}, 218 {Opt_gid, "gid=%u"}, 219 {Opt_umask, "umask=%u"}, 220 {Opt_err, NULL} 221 }; 222 223 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize, 224 int *flag) 225 { 226 void *nls_map = (void *)-1; /* -1: no change; NULL: none */ 227 char *p; 228 struct jfs_sb_info *sbi = JFS_SBI(sb); 229 230 *newLVSize = 0; 231 232 if (!options) 233 return 1; 234 235 while ((p = strsep(&options, ",")) != NULL) { 236 substring_t args[MAX_OPT_ARGS]; 237 int token; 238 if (!*p) 239 continue; 240 241 token = match_token(p, tokens, args); 242 switch (token) { 243 case Opt_integrity: 244 *flag &= ~JFS_NOINTEGRITY; 245 break; 246 case Opt_nointegrity: 247 *flag |= JFS_NOINTEGRITY; 248 break; 249 case Opt_ignore: 250 /* Silently ignore the quota options */ 251 /* Don't do anything ;-) */ 252 break; 253 case Opt_iocharset: 254 if (nls_map && nls_map != (void *) -1) 255 unload_nls(nls_map); 256 if (!strcmp(args[0].from, "none")) 257 nls_map = NULL; 258 else { 259 nls_map = load_nls(args[0].from); 260 if (!nls_map) { 261 printk(KERN_ERR 262 "JFS: charset not found\n"); 263 goto cleanup; 264 } 265 } 266 break; 267 case Opt_resize: 268 { 269 char *resize = args[0].from; 270 *newLVSize = simple_strtoull(resize, &resize, 0); 271 break; 272 } 273 case Opt_resize_nosize: 274 { 275 *newLVSize = sb->s_bdev->bd_inode->i_size >> 276 sb->s_blocksize_bits; 277 if (*newLVSize == 0) 278 printk(KERN_ERR 279 "JFS: Cannot determine volume size\n"); 280 break; 281 } 282 case Opt_errors: 283 { 284 char *errors = args[0].from; 285 if (!errors || !*errors) 286 goto cleanup; 287 if (!strcmp(errors, "continue")) { 288 *flag &= ~JFS_ERR_REMOUNT_RO; 289 *flag &= ~JFS_ERR_PANIC; 290 *flag |= JFS_ERR_CONTINUE; 291 } else if (!strcmp(errors, "remount-ro")) { 292 *flag &= ~JFS_ERR_CONTINUE; 293 *flag &= ~JFS_ERR_PANIC; 294 *flag |= JFS_ERR_REMOUNT_RO; 295 } else if (!strcmp(errors, "panic")) { 296 *flag &= ~JFS_ERR_CONTINUE; 297 *flag &= ~JFS_ERR_REMOUNT_RO; 298 *flag |= JFS_ERR_PANIC; 299 } else { 300 printk(KERN_ERR 301 "JFS: %s is an invalid error handler\n", 302 errors); 303 goto cleanup; 304 } 305 break; 306 } 307 308 #ifdef CONFIG_QUOTA 309 case Opt_quota: 310 case Opt_usrquota: 311 *flag |= JFS_USRQUOTA; 312 break; 313 case Opt_grpquota: 314 *flag |= JFS_GRPQUOTA; 315 break; 316 #else 317 case Opt_usrquota: 318 case Opt_grpquota: 319 case Opt_quota: 320 printk(KERN_ERR 321 "JFS: quota operations not supported\n"); 322 break; 323 #endif 324 case Opt_uid: 325 { 326 char *uid = args[0].from; 327 sbi->uid = simple_strtoul(uid, &uid, 0); 328 break; 329 } 330 case Opt_gid: 331 { 332 char *gid = args[0].from; 333 sbi->gid = simple_strtoul(gid, &gid, 0); 334 break; 335 } 336 case Opt_umask: 337 { 338 char *umask = args[0].from; 339 sbi->umask = simple_strtoul(umask, &umask, 8); 340 if (sbi->umask & ~0777) { 341 printk(KERN_ERR 342 "JFS: Invalid value of umask\n"); 343 goto cleanup; 344 } 345 break; 346 } 347 default: 348 printk("jfs: Unrecognized mount option \"%s\" " 349 " or missing value\n", p); 350 goto cleanup; 351 } 352 } 353 354 if (nls_map != (void *) -1) { 355 /* Discard old (if remount) */ 356 if (sbi->nls_tab) 357 unload_nls(sbi->nls_tab); 358 sbi->nls_tab = nls_map; 359 } 360 return 1; 361 362 cleanup: 363 if (nls_map && nls_map != (void *) -1) 364 unload_nls(nls_map); 365 return 0; 366 } 367 368 static int jfs_remount(struct super_block *sb, int *flags, char *data) 369 { 370 s64 newLVSize = 0; 371 int rc = 0; 372 int flag = JFS_SBI(sb)->flag; 373 374 if (!parse_options(data, sb, &newLVSize, &flag)) { 375 return -EINVAL; 376 } 377 if (newLVSize) { 378 if (sb->s_flags & MS_RDONLY) { 379 printk(KERN_ERR 380 "JFS: resize requires volume to be mounted read-write\n"); 381 return -EROFS; 382 } 383 rc = jfs_extendfs(sb, newLVSize, 0); 384 if (rc) 385 return rc; 386 } 387 388 if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) { 389 /* 390 * Invalidate any previously read metadata. fsck may have 391 * changed the on-disk data since we mounted r/o 392 */ 393 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0); 394 395 JFS_SBI(sb)->flag = flag; 396 return jfs_mount_rw(sb, 1); 397 } 398 if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) { 399 rc = jfs_umount_rw(sb); 400 JFS_SBI(sb)->flag = flag; 401 return rc; 402 } 403 if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY)) 404 if (!(sb->s_flags & MS_RDONLY)) { 405 rc = jfs_umount_rw(sb); 406 if (rc) 407 return rc; 408 JFS_SBI(sb)->flag = flag; 409 return jfs_mount_rw(sb, 1); 410 } 411 JFS_SBI(sb)->flag = flag; 412 413 return 0; 414 } 415 416 static int jfs_fill_super(struct super_block *sb, void *data, int silent) 417 { 418 struct jfs_sb_info *sbi; 419 struct inode *inode; 420 int rc; 421 s64 newLVSize = 0; 422 int flag, ret = -EINVAL; 423 424 jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags); 425 426 if (!new_valid_dev(sb->s_bdev->bd_dev)) 427 return -EOVERFLOW; 428 429 sbi = kzalloc(sizeof (struct jfs_sb_info), GFP_KERNEL); 430 if (!sbi) 431 return -ENOMEM; 432 sb->s_fs_info = sbi; 433 sbi->sb = sb; 434 sbi->uid = sbi->gid = sbi->umask = -1; 435 436 /* initialize the mount flag and determine the default error handler */ 437 flag = JFS_ERR_REMOUNT_RO; 438 439 if (!parse_options((char *) data, sb, &newLVSize, &flag)) { 440 kfree(sbi); 441 return -EINVAL; 442 } 443 sbi->flag = flag; 444 445 #ifdef CONFIG_JFS_POSIX_ACL 446 sb->s_flags |= MS_POSIXACL; 447 #endif 448 449 if (newLVSize) { 450 printk(KERN_ERR "resize option for remount only\n"); 451 return -EINVAL; 452 } 453 454 /* 455 * Initialize blocksize to 4K. 456 */ 457 sb_set_blocksize(sb, PSIZE); 458 459 /* 460 * Set method vectors. 461 */ 462 sb->s_op = &jfs_super_operations; 463 sb->s_export_op = &jfs_export_operations; 464 465 /* 466 * Initialize direct-mapping inode/address-space 467 */ 468 inode = new_inode(sb); 469 if (inode == NULL) { 470 ret = -ENOMEM; 471 goto out_kfree; 472 } 473 inode->i_ino = 0; 474 inode->i_nlink = 1; 475 inode->i_size = sb->s_bdev->bd_inode->i_size; 476 inode->i_mapping->a_ops = &jfs_metapage_aops; 477 insert_inode_hash(inode); 478 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS); 479 480 sbi->direct_inode = inode; 481 482 rc = jfs_mount(sb); 483 if (rc) { 484 if (!silent) { 485 jfs_err("jfs_mount failed w/return code = %d", rc); 486 } 487 goto out_mount_failed; 488 } 489 if (sb->s_flags & MS_RDONLY) 490 sbi->log = NULL; 491 else { 492 rc = jfs_mount_rw(sb, 0); 493 if (rc) { 494 if (!silent) { 495 jfs_err("jfs_mount_rw failed, return code = %d", 496 rc); 497 } 498 goto out_no_rw; 499 } 500 } 501 502 sb->s_magic = JFS_SUPER_MAGIC; 503 504 inode = jfs_iget(sb, ROOT_I); 505 if (IS_ERR(inode)) { 506 ret = PTR_ERR(inode); 507 goto out_no_rw; 508 } 509 sb->s_root = d_alloc_root(inode); 510 if (!sb->s_root) 511 goto out_no_root; 512 513 if (sbi->mntflag & JFS_OS2) 514 sb->s_root->d_op = &jfs_ci_dentry_operations; 515 516 /* logical blocks are represented by 40 bits in pxd_t, etc. */ 517 sb->s_maxbytes = ((u64) sb->s_blocksize) << 40; 518 #if BITS_PER_LONG == 32 519 /* 520 * Page cache is indexed by long. 521 * I would use MAX_LFS_FILESIZE, but it's only half as big 522 */ 523 sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, sb->s_maxbytes); 524 #endif 525 sb->s_time_gran = 1; 526 return 0; 527 528 out_no_root: 529 jfs_err("jfs_read_super: get root dentry failed"); 530 iput(inode); 531 532 out_no_rw: 533 rc = jfs_umount(sb); 534 if (rc) { 535 jfs_err("jfs_umount failed with return code %d", rc); 536 } 537 out_mount_failed: 538 filemap_write_and_wait(sbi->direct_inode->i_mapping); 539 truncate_inode_pages(sbi->direct_inode->i_mapping, 0); 540 make_bad_inode(sbi->direct_inode); 541 iput(sbi->direct_inode); 542 sbi->direct_inode = NULL; 543 out_kfree: 544 if (sbi->nls_tab) 545 unload_nls(sbi->nls_tab); 546 kfree(sbi); 547 return ret; 548 } 549 550 static int jfs_freeze(struct super_block *sb) 551 { 552 struct jfs_sb_info *sbi = JFS_SBI(sb); 553 struct jfs_log *log = sbi->log; 554 555 if (!(sb->s_flags & MS_RDONLY)) { 556 txQuiesce(sb); 557 lmLogShutdown(log); 558 updateSuper(sb, FM_CLEAN); 559 } 560 return 0; 561 } 562 563 static int jfs_unfreeze(struct super_block *sb) 564 { 565 struct jfs_sb_info *sbi = JFS_SBI(sb); 566 struct jfs_log *log = sbi->log; 567 int rc = 0; 568 569 if (!(sb->s_flags & MS_RDONLY)) { 570 updateSuper(sb, FM_MOUNT); 571 if ((rc = lmLogInit(log))) 572 jfs_err("jfs_unlock failed with return code %d", rc); 573 else 574 txResume(sb); 575 } 576 return 0; 577 } 578 579 static int jfs_get_sb(struct file_system_type *fs_type, 580 int flags, const char *dev_name, void *data, struct vfsmount *mnt) 581 { 582 return get_sb_bdev(fs_type, flags, dev_name, data, jfs_fill_super, 583 mnt); 584 } 585 586 static int jfs_sync_fs(struct super_block *sb, int wait) 587 { 588 struct jfs_log *log = JFS_SBI(sb)->log; 589 590 /* log == NULL indicates read-only mount */ 591 if (log) { 592 jfs_flush_journal(log, wait); 593 jfs_syncpt(log, 0); 594 } 595 596 return 0; 597 } 598 599 static int jfs_show_options(struct seq_file *seq, struct vfsmount *vfs) 600 { 601 struct jfs_sb_info *sbi = JFS_SBI(vfs->mnt_sb); 602 603 if (sbi->uid != -1) 604 seq_printf(seq, ",uid=%d", sbi->uid); 605 if (sbi->gid != -1) 606 seq_printf(seq, ",gid=%d", sbi->gid); 607 if (sbi->umask != -1) 608 seq_printf(seq, ",umask=%03o", sbi->umask); 609 if (sbi->flag & JFS_NOINTEGRITY) 610 seq_puts(seq, ",nointegrity"); 611 if (sbi->nls_tab) 612 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset); 613 if (sbi->flag & JFS_ERR_CONTINUE) 614 seq_printf(seq, ",errors=continue"); 615 if (sbi->flag & JFS_ERR_PANIC) 616 seq_printf(seq, ",errors=panic"); 617 618 #ifdef CONFIG_QUOTA 619 if (sbi->flag & JFS_USRQUOTA) 620 seq_puts(seq, ",usrquota"); 621 622 if (sbi->flag & JFS_GRPQUOTA) 623 seq_puts(seq, ",grpquota"); 624 #endif 625 626 return 0; 627 } 628 629 #ifdef CONFIG_QUOTA 630 631 /* Read data from quotafile - avoid pagecache and such because we cannot afford 632 * acquiring the locks... As quota files are never truncated and quota code 633 * itself serializes the operations (and noone else should touch the files) 634 * we don't have to be afraid of races */ 635 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data, 636 size_t len, loff_t off) 637 { 638 struct inode *inode = sb_dqopt(sb)->files[type]; 639 sector_t blk = off >> sb->s_blocksize_bits; 640 int err = 0; 641 int offset = off & (sb->s_blocksize - 1); 642 int tocopy; 643 size_t toread; 644 struct buffer_head tmp_bh; 645 struct buffer_head *bh; 646 loff_t i_size = i_size_read(inode); 647 648 if (off > i_size) 649 return 0; 650 if (off+len > i_size) 651 len = i_size-off; 652 toread = len; 653 while (toread > 0) { 654 tocopy = sb->s_blocksize - offset < toread ? 655 sb->s_blocksize - offset : toread; 656 657 tmp_bh.b_state = 0; 658 tmp_bh.b_size = 1 << inode->i_blkbits; 659 err = jfs_get_block(inode, blk, &tmp_bh, 0); 660 if (err) 661 return err; 662 if (!buffer_mapped(&tmp_bh)) /* A hole? */ 663 memset(data, 0, tocopy); 664 else { 665 bh = sb_bread(sb, tmp_bh.b_blocknr); 666 if (!bh) 667 return -EIO; 668 memcpy(data, bh->b_data+offset, tocopy); 669 brelse(bh); 670 } 671 offset = 0; 672 toread -= tocopy; 673 data += tocopy; 674 blk++; 675 } 676 return len; 677 } 678 679 /* Write to quotafile */ 680 static ssize_t jfs_quota_write(struct super_block *sb, int type, 681 const char *data, size_t len, loff_t off) 682 { 683 struct inode *inode = sb_dqopt(sb)->files[type]; 684 sector_t blk = off >> sb->s_blocksize_bits; 685 int err = 0; 686 int offset = off & (sb->s_blocksize - 1); 687 int tocopy; 688 size_t towrite = len; 689 struct buffer_head tmp_bh; 690 struct buffer_head *bh; 691 692 mutex_lock(&inode->i_mutex); 693 while (towrite > 0) { 694 tocopy = sb->s_blocksize - offset < towrite ? 695 sb->s_blocksize - offset : towrite; 696 697 tmp_bh.b_state = 0; 698 tmp_bh.b_size = 1 << inode->i_blkbits; 699 err = jfs_get_block(inode, blk, &tmp_bh, 1); 700 if (err) 701 goto out; 702 if (offset || tocopy != sb->s_blocksize) 703 bh = sb_bread(sb, tmp_bh.b_blocknr); 704 else 705 bh = sb_getblk(sb, tmp_bh.b_blocknr); 706 if (!bh) { 707 err = -EIO; 708 goto out; 709 } 710 lock_buffer(bh); 711 memcpy(bh->b_data+offset, data, tocopy); 712 flush_dcache_page(bh->b_page); 713 set_buffer_uptodate(bh); 714 mark_buffer_dirty(bh); 715 unlock_buffer(bh); 716 brelse(bh); 717 offset = 0; 718 towrite -= tocopy; 719 data += tocopy; 720 blk++; 721 } 722 out: 723 if (len == towrite) { 724 mutex_unlock(&inode->i_mutex); 725 return err; 726 } 727 if (inode->i_size < off+len-towrite) 728 i_size_write(inode, off+len-towrite); 729 inode->i_version++; 730 inode->i_mtime = inode->i_ctime = CURRENT_TIME; 731 mark_inode_dirty(inode); 732 mutex_unlock(&inode->i_mutex); 733 return len - towrite; 734 } 735 736 #endif 737 738 static const struct super_operations jfs_super_operations = { 739 .alloc_inode = jfs_alloc_inode, 740 .destroy_inode = jfs_destroy_inode, 741 .dirty_inode = jfs_dirty_inode, 742 .write_inode = jfs_write_inode, 743 .delete_inode = jfs_delete_inode, 744 .put_super = jfs_put_super, 745 .sync_fs = jfs_sync_fs, 746 .freeze_fs = jfs_freeze, 747 .unfreeze_fs = jfs_unfreeze, 748 .statfs = jfs_statfs, 749 .remount_fs = jfs_remount, 750 .show_options = jfs_show_options, 751 #ifdef CONFIG_QUOTA 752 .quota_read = jfs_quota_read, 753 .quota_write = jfs_quota_write, 754 #endif 755 }; 756 757 static const struct export_operations jfs_export_operations = { 758 .fh_to_dentry = jfs_fh_to_dentry, 759 .fh_to_parent = jfs_fh_to_parent, 760 .get_parent = jfs_get_parent, 761 }; 762 763 static struct file_system_type jfs_fs_type = { 764 .owner = THIS_MODULE, 765 .name = "jfs", 766 .get_sb = jfs_get_sb, 767 .kill_sb = kill_block_super, 768 .fs_flags = FS_REQUIRES_DEV, 769 }; 770 771 static void init_once(void *foo) 772 { 773 struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo; 774 775 memset(jfs_ip, 0, sizeof(struct jfs_inode_info)); 776 INIT_LIST_HEAD(&jfs_ip->anon_inode_list); 777 init_rwsem(&jfs_ip->rdwrlock); 778 mutex_init(&jfs_ip->commit_mutex); 779 init_rwsem(&jfs_ip->xattr_sem); 780 spin_lock_init(&jfs_ip->ag_lock); 781 jfs_ip->active_ag = -1; 782 #ifdef CONFIG_JFS_POSIX_ACL 783 jfs_ip->i_acl = JFS_ACL_NOT_CACHED; 784 jfs_ip->i_default_acl = JFS_ACL_NOT_CACHED; 785 #endif 786 inode_init_once(&jfs_ip->vfs_inode); 787 } 788 789 static int __init init_jfs_fs(void) 790 { 791 int i; 792 int rc; 793 794 jfs_inode_cachep = 795 kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0, 796 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, 797 init_once); 798 if (jfs_inode_cachep == NULL) 799 return -ENOMEM; 800 801 /* 802 * Metapage initialization 803 */ 804 rc = metapage_init(); 805 if (rc) { 806 jfs_err("metapage_init failed w/rc = %d", rc); 807 goto free_slab; 808 } 809 810 /* 811 * Transaction Manager initialization 812 */ 813 rc = txInit(); 814 if (rc) { 815 jfs_err("txInit failed w/rc = %d", rc); 816 goto free_metapage; 817 } 818 819 /* 820 * I/O completion thread (endio) 821 */ 822 jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO"); 823 if (IS_ERR(jfsIOthread)) { 824 rc = PTR_ERR(jfsIOthread); 825 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 826 goto end_txmngr; 827 } 828 829 if (commit_threads < 1) 830 commit_threads = num_online_cpus(); 831 if (commit_threads > MAX_COMMIT_THREADS) 832 commit_threads = MAX_COMMIT_THREADS; 833 834 for (i = 0; i < commit_threads; i++) { 835 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, "jfsCommit"); 836 if (IS_ERR(jfsCommitThread[i])) { 837 rc = PTR_ERR(jfsCommitThread[i]); 838 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 839 commit_threads = i; 840 goto kill_committask; 841 } 842 } 843 844 jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync"); 845 if (IS_ERR(jfsSyncThread)) { 846 rc = PTR_ERR(jfsSyncThread); 847 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 848 goto kill_committask; 849 } 850 851 #ifdef PROC_FS_JFS 852 jfs_proc_init(); 853 #endif 854 855 return register_filesystem(&jfs_fs_type); 856 857 kill_committask: 858 for (i = 0; i < commit_threads; i++) 859 kthread_stop(jfsCommitThread[i]); 860 kthread_stop(jfsIOthread); 861 end_txmngr: 862 txExit(); 863 free_metapage: 864 metapage_exit(); 865 free_slab: 866 kmem_cache_destroy(jfs_inode_cachep); 867 return rc; 868 } 869 870 static void __exit exit_jfs_fs(void) 871 { 872 int i; 873 874 jfs_info("exit_jfs_fs called"); 875 876 txExit(); 877 metapage_exit(); 878 879 kthread_stop(jfsIOthread); 880 for (i = 0; i < commit_threads; i++) 881 kthread_stop(jfsCommitThread[i]); 882 kthread_stop(jfsSyncThread); 883 #ifdef PROC_FS_JFS 884 jfs_proc_clean(); 885 #endif 886 unregister_filesystem(&jfs_fs_type); 887 kmem_cache_destroy(jfs_inode_cachep); 888 } 889 890 module_init(init_jfs_fs) 891 module_exit(exit_jfs_fs) 892