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 void jfs_clear_inode(struct inode *inode) 136 { 137 dquot_drop(inode); 138 } 139 140 static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf) 141 { 142 struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb); 143 s64 maxinodes; 144 struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap; 145 146 jfs_info("In jfs_statfs"); 147 buf->f_type = JFS_SUPER_MAGIC; 148 buf->f_bsize = sbi->bsize; 149 buf->f_blocks = sbi->bmap->db_mapsize; 150 buf->f_bfree = sbi->bmap->db_nfree; 151 buf->f_bavail = sbi->bmap->db_nfree; 152 /* 153 * If we really return the number of allocated & free inodes, some 154 * applications will fail because they won't see enough free inodes. 155 * We'll try to calculate some guess as to how may inodes we can 156 * really allocate 157 * 158 * buf->f_files = atomic_read(&imap->im_numinos); 159 * buf->f_ffree = atomic_read(&imap->im_numfree); 160 */ 161 maxinodes = min((s64) atomic_read(&imap->im_numinos) + 162 ((sbi->bmap->db_nfree >> imap->im_l2nbperiext) 163 << L2INOSPEREXT), (s64) 0xffffffffLL); 164 buf->f_files = maxinodes; 165 buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) - 166 atomic_read(&imap->im_numfree)); 167 buf->f_fsid.val[0] = (u32)crc32_le(0, sbi->uuid, sizeof(sbi->uuid)/2); 168 buf->f_fsid.val[1] = (u32)crc32_le(0, sbi->uuid + sizeof(sbi->uuid)/2, 169 sizeof(sbi->uuid)/2); 170 171 buf->f_namelen = JFS_NAME_MAX; 172 return 0; 173 } 174 175 static void jfs_put_super(struct super_block *sb) 176 { 177 struct jfs_sb_info *sbi = JFS_SBI(sb); 178 int rc; 179 180 jfs_info("In jfs_put_super"); 181 182 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); 183 184 lock_kernel(); 185 186 rc = jfs_umount(sb); 187 if (rc) 188 jfs_err("jfs_umount failed with return code %d", rc); 189 190 unload_nls(sbi->nls_tab); 191 192 truncate_inode_pages(sbi->direct_inode->i_mapping, 0); 193 iput(sbi->direct_inode); 194 195 kfree(sbi); 196 197 unlock_kernel(); 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 unload_nls(sbi->nls_tab); 357 sbi->nls_tab = nls_map; 358 } 359 return 1; 360 361 cleanup: 362 if (nls_map && nls_map != (void *) -1) 363 unload_nls(nls_map); 364 return 0; 365 } 366 367 static int jfs_remount(struct super_block *sb, int *flags, char *data) 368 { 369 s64 newLVSize = 0; 370 int rc = 0; 371 int flag = JFS_SBI(sb)->flag; 372 int ret; 373 374 if (!parse_options(data, sb, &newLVSize, &flag)) { 375 return -EINVAL; 376 } 377 lock_kernel(); 378 if (newLVSize) { 379 if (sb->s_flags & MS_RDONLY) { 380 printk(KERN_ERR 381 "JFS: resize requires volume to be mounted read-write\n"); 382 unlock_kernel(); 383 return -EROFS; 384 } 385 rc = jfs_extendfs(sb, newLVSize, 0); 386 if (rc) { 387 unlock_kernel(); 388 return rc; 389 } 390 } 391 392 if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) { 393 /* 394 * Invalidate any previously read metadata. fsck may have 395 * changed the on-disk data since we mounted r/o 396 */ 397 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0); 398 399 JFS_SBI(sb)->flag = flag; 400 ret = jfs_mount_rw(sb, 1); 401 402 /* mark the fs r/w for quota activity */ 403 sb->s_flags &= ~MS_RDONLY; 404 405 unlock_kernel(); 406 dquot_resume(sb, -1); 407 return ret; 408 } 409 if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) { 410 rc = dquot_suspend(sb, -1); 411 if (rc < 0) { 412 unlock_kernel(); 413 return rc; 414 } 415 rc = jfs_umount_rw(sb); 416 JFS_SBI(sb)->flag = flag; 417 unlock_kernel(); 418 return rc; 419 } 420 if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY)) 421 if (!(sb->s_flags & MS_RDONLY)) { 422 rc = jfs_umount_rw(sb); 423 if (rc) { 424 unlock_kernel(); 425 return rc; 426 } 427 JFS_SBI(sb)->flag = flag; 428 ret = jfs_mount_rw(sb, 1); 429 unlock_kernel(); 430 return ret; 431 } 432 JFS_SBI(sb)->flag = flag; 433 434 unlock_kernel(); 435 return 0; 436 } 437 438 static int jfs_fill_super(struct super_block *sb, void *data, int silent) 439 { 440 struct jfs_sb_info *sbi; 441 struct inode *inode; 442 int rc; 443 s64 newLVSize = 0; 444 int flag, ret = -EINVAL; 445 446 jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags); 447 448 if (!new_valid_dev(sb->s_bdev->bd_dev)) 449 return -EOVERFLOW; 450 451 sbi = kzalloc(sizeof (struct jfs_sb_info), GFP_KERNEL); 452 if (!sbi) 453 return -ENOMEM; 454 sb->s_fs_info = sbi; 455 sbi->sb = sb; 456 sbi->uid = sbi->gid = sbi->umask = -1; 457 458 /* initialize the mount flag and determine the default error handler */ 459 flag = JFS_ERR_REMOUNT_RO; 460 461 if (!parse_options((char *) data, sb, &newLVSize, &flag)) 462 goto out_kfree; 463 sbi->flag = flag; 464 465 #ifdef CONFIG_JFS_POSIX_ACL 466 sb->s_flags |= MS_POSIXACL; 467 #endif 468 469 if (newLVSize) { 470 printk(KERN_ERR "resize option for remount only\n"); 471 goto out_kfree; 472 } 473 474 /* 475 * Initialize blocksize to 4K. 476 */ 477 sb_set_blocksize(sb, PSIZE); 478 479 /* 480 * Set method vectors. 481 */ 482 sb->s_op = &jfs_super_operations; 483 sb->s_export_op = &jfs_export_operations; 484 #ifdef CONFIG_QUOTA 485 sb->dq_op = &dquot_operations; 486 sb->s_qcop = &dquot_quotactl_ops; 487 #endif 488 489 /* 490 * Initialize direct-mapping inode/address-space 491 */ 492 inode = new_inode(sb); 493 if (inode == NULL) { 494 ret = -ENOMEM; 495 goto out_unload; 496 } 497 inode->i_ino = 0; 498 inode->i_nlink = 1; 499 inode->i_size = sb->s_bdev->bd_inode->i_size; 500 inode->i_mapping->a_ops = &jfs_metapage_aops; 501 insert_inode_hash(inode); 502 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS); 503 504 sbi->direct_inode = inode; 505 506 rc = jfs_mount(sb); 507 if (rc) { 508 if (!silent) { 509 jfs_err("jfs_mount failed w/return code = %d", rc); 510 } 511 goto out_mount_failed; 512 } 513 if (sb->s_flags & MS_RDONLY) 514 sbi->log = NULL; 515 else { 516 rc = jfs_mount_rw(sb, 0); 517 if (rc) { 518 if (!silent) { 519 jfs_err("jfs_mount_rw failed, return code = %d", 520 rc); 521 } 522 goto out_no_rw; 523 } 524 } 525 526 sb->s_magic = JFS_SUPER_MAGIC; 527 528 inode = jfs_iget(sb, ROOT_I); 529 if (IS_ERR(inode)) { 530 ret = PTR_ERR(inode); 531 goto out_no_rw; 532 } 533 sb->s_root = d_alloc_root(inode); 534 if (!sb->s_root) 535 goto out_no_root; 536 537 if (sbi->mntflag & JFS_OS2) 538 sb->s_root->d_op = &jfs_ci_dentry_operations; 539 540 /* logical blocks are represented by 40 bits in pxd_t, etc. */ 541 sb->s_maxbytes = ((u64) sb->s_blocksize) << 40; 542 #if BITS_PER_LONG == 32 543 /* 544 * Page cache is indexed by long. 545 * I would use MAX_LFS_FILESIZE, but it's only half as big 546 */ 547 sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, (u64)sb->s_maxbytes); 548 #endif 549 sb->s_time_gran = 1; 550 return 0; 551 552 out_no_root: 553 jfs_err("jfs_read_super: get root dentry failed"); 554 iput(inode); 555 556 out_no_rw: 557 rc = jfs_umount(sb); 558 if (rc) { 559 jfs_err("jfs_umount failed with return code %d", rc); 560 } 561 out_mount_failed: 562 filemap_write_and_wait(sbi->direct_inode->i_mapping); 563 truncate_inode_pages(sbi->direct_inode->i_mapping, 0); 564 make_bad_inode(sbi->direct_inode); 565 iput(sbi->direct_inode); 566 sbi->direct_inode = NULL; 567 out_unload: 568 if (sbi->nls_tab) 569 unload_nls(sbi->nls_tab); 570 out_kfree: 571 kfree(sbi); 572 return ret; 573 } 574 575 static int jfs_freeze(struct super_block *sb) 576 { 577 struct jfs_sb_info *sbi = JFS_SBI(sb); 578 struct jfs_log *log = sbi->log; 579 580 if (!(sb->s_flags & MS_RDONLY)) { 581 txQuiesce(sb); 582 lmLogShutdown(log); 583 updateSuper(sb, FM_CLEAN); 584 } 585 return 0; 586 } 587 588 static int jfs_unfreeze(struct super_block *sb) 589 { 590 struct jfs_sb_info *sbi = JFS_SBI(sb); 591 struct jfs_log *log = sbi->log; 592 int rc = 0; 593 594 if (!(sb->s_flags & MS_RDONLY)) { 595 updateSuper(sb, FM_MOUNT); 596 if ((rc = lmLogInit(log))) 597 jfs_err("jfs_unlock failed with return code %d", rc); 598 else 599 txResume(sb); 600 } 601 return 0; 602 } 603 604 static int jfs_get_sb(struct file_system_type *fs_type, 605 int flags, const char *dev_name, void *data, struct vfsmount *mnt) 606 { 607 return get_sb_bdev(fs_type, flags, dev_name, data, jfs_fill_super, 608 mnt); 609 } 610 611 static int jfs_sync_fs(struct super_block *sb, int wait) 612 { 613 struct jfs_log *log = JFS_SBI(sb)->log; 614 615 /* log == NULL indicates read-only mount */ 616 if (log) { 617 jfs_flush_journal(log, wait); 618 jfs_syncpt(log, 0); 619 } 620 621 return 0; 622 } 623 624 static int jfs_show_options(struct seq_file *seq, struct vfsmount *vfs) 625 { 626 struct jfs_sb_info *sbi = JFS_SBI(vfs->mnt_sb); 627 628 if (sbi->uid != -1) 629 seq_printf(seq, ",uid=%d", sbi->uid); 630 if (sbi->gid != -1) 631 seq_printf(seq, ",gid=%d", sbi->gid); 632 if (sbi->umask != -1) 633 seq_printf(seq, ",umask=%03o", sbi->umask); 634 if (sbi->flag & JFS_NOINTEGRITY) 635 seq_puts(seq, ",nointegrity"); 636 if (sbi->nls_tab) 637 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset); 638 if (sbi->flag & JFS_ERR_CONTINUE) 639 seq_printf(seq, ",errors=continue"); 640 if (sbi->flag & JFS_ERR_PANIC) 641 seq_printf(seq, ",errors=panic"); 642 643 #ifdef CONFIG_QUOTA 644 if (sbi->flag & JFS_USRQUOTA) 645 seq_puts(seq, ",usrquota"); 646 647 if (sbi->flag & JFS_GRPQUOTA) 648 seq_puts(seq, ",grpquota"); 649 #endif 650 651 return 0; 652 } 653 654 #ifdef CONFIG_QUOTA 655 656 /* Read data from quotafile - avoid pagecache and such because we cannot afford 657 * acquiring the locks... As quota files are never truncated and quota code 658 * itself serializes the operations (and noone else should touch the files) 659 * we don't have to be afraid of races */ 660 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data, 661 size_t len, loff_t off) 662 { 663 struct inode *inode = sb_dqopt(sb)->files[type]; 664 sector_t blk = off >> sb->s_blocksize_bits; 665 int err = 0; 666 int offset = off & (sb->s_blocksize - 1); 667 int tocopy; 668 size_t toread; 669 struct buffer_head tmp_bh; 670 struct buffer_head *bh; 671 loff_t i_size = i_size_read(inode); 672 673 if (off > i_size) 674 return 0; 675 if (off+len > i_size) 676 len = i_size-off; 677 toread = len; 678 while (toread > 0) { 679 tocopy = sb->s_blocksize - offset < toread ? 680 sb->s_blocksize - offset : toread; 681 682 tmp_bh.b_state = 0; 683 tmp_bh.b_size = 1 << inode->i_blkbits; 684 err = jfs_get_block(inode, blk, &tmp_bh, 0); 685 if (err) 686 return err; 687 if (!buffer_mapped(&tmp_bh)) /* A hole? */ 688 memset(data, 0, tocopy); 689 else { 690 bh = sb_bread(sb, tmp_bh.b_blocknr); 691 if (!bh) 692 return -EIO; 693 memcpy(data, bh->b_data+offset, tocopy); 694 brelse(bh); 695 } 696 offset = 0; 697 toread -= tocopy; 698 data += tocopy; 699 blk++; 700 } 701 return len; 702 } 703 704 /* Write to quotafile */ 705 static ssize_t jfs_quota_write(struct super_block *sb, int type, 706 const char *data, size_t len, loff_t off) 707 { 708 struct inode *inode = sb_dqopt(sb)->files[type]; 709 sector_t blk = off >> sb->s_blocksize_bits; 710 int err = 0; 711 int offset = off & (sb->s_blocksize - 1); 712 int tocopy; 713 size_t towrite = len; 714 struct buffer_head tmp_bh; 715 struct buffer_head *bh; 716 717 mutex_lock(&inode->i_mutex); 718 while (towrite > 0) { 719 tocopy = sb->s_blocksize - offset < towrite ? 720 sb->s_blocksize - offset : towrite; 721 722 tmp_bh.b_state = 0; 723 tmp_bh.b_size = 1 << inode->i_blkbits; 724 err = jfs_get_block(inode, blk, &tmp_bh, 1); 725 if (err) 726 goto out; 727 if (offset || tocopy != sb->s_blocksize) 728 bh = sb_bread(sb, tmp_bh.b_blocknr); 729 else 730 bh = sb_getblk(sb, tmp_bh.b_blocknr); 731 if (!bh) { 732 err = -EIO; 733 goto out; 734 } 735 lock_buffer(bh); 736 memcpy(bh->b_data+offset, data, tocopy); 737 flush_dcache_page(bh->b_page); 738 set_buffer_uptodate(bh); 739 mark_buffer_dirty(bh); 740 unlock_buffer(bh); 741 brelse(bh); 742 offset = 0; 743 towrite -= tocopy; 744 data += tocopy; 745 blk++; 746 } 747 out: 748 if (len == towrite) { 749 mutex_unlock(&inode->i_mutex); 750 return err; 751 } 752 if (inode->i_size < off+len-towrite) 753 i_size_write(inode, off+len-towrite); 754 inode->i_version++; 755 inode->i_mtime = inode->i_ctime = CURRENT_TIME; 756 mark_inode_dirty(inode); 757 mutex_unlock(&inode->i_mutex); 758 return len - towrite; 759 } 760 761 #endif 762 763 static const struct super_operations jfs_super_operations = { 764 .alloc_inode = jfs_alloc_inode, 765 .destroy_inode = jfs_destroy_inode, 766 .dirty_inode = jfs_dirty_inode, 767 .write_inode = jfs_write_inode, 768 .delete_inode = jfs_delete_inode, 769 .clear_inode = jfs_clear_inode, 770 .put_super = jfs_put_super, 771 .sync_fs = jfs_sync_fs, 772 .freeze_fs = jfs_freeze, 773 .unfreeze_fs = jfs_unfreeze, 774 .statfs = jfs_statfs, 775 .remount_fs = jfs_remount, 776 .show_options = jfs_show_options, 777 #ifdef CONFIG_QUOTA 778 .quota_read = jfs_quota_read, 779 .quota_write = jfs_quota_write, 780 #endif 781 }; 782 783 static const struct export_operations jfs_export_operations = { 784 .fh_to_dentry = jfs_fh_to_dentry, 785 .fh_to_parent = jfs_fh_to_parent, 786 .get_parent = jfs_get_parent, 787 }; 788 789 static struct file_system_type jfs_fs_type = { 790 .owner = THIS_MODULE, 791 .name = "jfs", 792 .get_sb = jfs_get_sb, 793 .kill_sb = kill_block_super, 794 .fs_flags = FS_REQUIRES_DEV, 795 }; 796 797 static void init_once(void *foo) 798 { 799 struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo; 800 801 memset(jfs_ip, 0, sizeof(struct jfs_inode_info)); 802 INIT_LIST_HEAD(&jfs_ip->anon_inode_list); 803 init_rwsem(&jfs_ip->rdwrlock); 804 mutex_init(&jfs_ip->commit_mutex); 805 init_rwsem(&jfs_ip->xattr_sem); 806 spin_lock_init(&jfs_ip->ag_lock); 807 jfs_ip->active_ag = -1; 808 inode_init_once(&jfs_ip->vfs_inode); 809 } 810 811 static int __init init_jfs_fs(void) 812 { 813 int i; 814 int rc; 815 816 jfs_inode_cachep = 817 kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0, 818 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, 819 init_once); 820 if (jfs_inode_cachep == NULL) 821 return -ENOMEM; 822 823 /* 824 * Metapage initialization 825 */ 826 rc = metapage_init(); 827 if (rc) { 828 jfs_err("metapage_init failed w/rc = %d", rc); 829 goto free_slab; 830 } 831 832 /* 833 * Transaction Manager initialization 834 */ 835 rc = txInit(); 836 if (rc) { 837 jfs_err("txInit failed w/rc = %d", rc); 838 goto free_metapage; 839 } 840 841 /* 842 * I/O completion thread (endio) 843 */ 844 jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO"); 845 if (IS_ERR(jfsIOthread)) { 846 rc = PTR_ERR(jfsIOthread); 847 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 848 goto end_txmngr; 849 } 850 851 if (commit_threads < 1) 852 commit_threads = num_online_cpus(); 853 if (commit_threads > MAX_COMMIT_THREADS) 854 commit_threads = MAX_COMMIT_THREADS; 855 856 for (i = 0; i < commit_threads; i++) { 857 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, "jfsCommit"); 858 if (IS_ERR(jfsCommitThread[i])) { 859 rc = PTR_ERR(jfsCommitThread[i]); 860 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 861 commit_threads = i; 862 goto kill_committask; 863 } 864 } 865 866 jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync"); 867 if (IS_ERR(jfsSyncThread)) { 868 rc = PTR_ERR(jfsSyncThread); 869 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 870 goto kill_committask; 871 } 872 873 #ifdef PROC_FS_JFS 874 jfs_proc_init(); 875 #endif 876 877 return register_filesystem(&jfs_fs_type); 878 879 kill_committask: 880 for (i = 0; i < commit_threads; i++) 881 kthread_stop(jfsCommitThread[i]); 882 kthread_stop(jfsIOthread); 883 end_txmngr: 884 txExit(); 885 free_metapage: 886 metapage_exit(); 887 free_slab: 888 kmem_cache_destroy(jfs_inode_cachep); 889 return rc; 890 } 891 892 static void __exit exit_jfs_fs(void) 893 { 894 int i; 895 896 jfs_info("exit_jfs_fs called"); 897 898 txExit(); 899 metapage_exit(); 900 901 kthread_stop(jfsIOthread); 902 for (i = 0; i < commit_threads; i++) 903 kthread_stop(jfsCommitThread[i]); 904 kthread_stop(jfsSyncThread); 905 #ifdef PROC_FS_JFS 906 jfs_proc_clean(); 907 #endif 908 unregister_filesystem(&jfs_fs_type); 909 kmem_cache_destroy(jfs_inode_cachep); 910 } 911 912 module_init(init_jfs_fs) 913 module_exit(exit_jfs_fs) 914