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/blkdev.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#include "jfs_xattr.h" 48 49MODULE_DESCRIPTION("The Journaled Filesystem (JFS)"); 50MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM"); 51MODULE_LICENSE("GPL"); 52 53static struct kmem_cache *jfs_inode_cachep; 54 55static const struct super_operations jfs_super_operations; 56static const struct export_operations jfs_export_operations; 57static struct file_system_type jfs_fs_type; 58 59#define MAX_COMMIT_THREADS 64 60static int commit_threads; 61module_param(commit_threads, int, 0); 62MODULE_PARM_DESC(commit_threads, "Number of commit threads"); 63 64static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS]; 65struct task_struct *jfsIOthread; 66struct task_struct *jfsSyncThread; 67 68#ifdef CONFIG_JFS_DEBUG 69int jfsloglevel = JFS_LOGLEVEL_WARN; 70module_param(jfsloglevel, int, 0644); 71MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)"); 72#endif 73 74static void jfs_handle_error(struct super_block *sb) 75{ 76 struct jfs_sb_info *sbi = JFS_SBI(sb); 77 78 if (sb->s_flags & MS_RDONLY) 79 return; 80 81 updateSuper(sb, FM_DIRTY); 82 83 if (sbi->flag & JFS_ERR_PANIC) 84 panic("JFS (device %s): panic forced after error\n", 85 sb->s_id); 86 else if (sbi->flag & JFS_ERR_REMOUNT_RO) { 87 jfs_err("ERROR: (device %s): remounting filesystem 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 95void jfs_error(struct super_block *sb, const char *fmt, ...) 96{ 97 struct va_format vaf; 98 va_list args; 99 100 va_start(args, fmt); 101 102 vaf.fmt = fmt; 103 vaf.va = &args; 104 105 pr_err("ERROR: (device %s): %ps: %pV\n", 106 sb->s_id, __builtin_return_address(0), &vaf); 107 108 va_end(args); 109 110 jfs_handle_error(sb); 111} 112 113static struct inode *jfs_alloc_inode(struct super_block *sb) 114{ 115 struct jfs_inode_info *jfs_inode; 116 117 jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS); 118 if (!jfs_inode) 119 return NULL; 120#ifdef CONFIG_QUOTA 121 memset(&jfs_inode->i_dquot, 0, sizeof(jfs_inode->i_dquot)); 122#endif 123 return &jfs_inode->vfs_inode; 124} 125 126static void jfs_i_callback(struct rcu_head *head) 127{ 128 struct inode *inode = container_of(head, struct inode, i_rcu); 129 struct jfs_inode_info *ji = JFS_IP(inode); 130 kmem_cache_free(jfs_inode_cachep, ji); 131} 132 133static void jfs_destroy_inode(struct inode *inode) 134{ 135 struct jfs_inode_info *ji = JFS_IP(inode); 136 137 BUG_ON(!list_empty(&ji->anon_inode_list)); 138 139 spin_lock_irq(&ji->ag_lock); 140 if (ji->active_ag != -1) { 141 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap; 142 atomic_dec(&bmap->db_active[ji->active_ag]); 143 ji->active_ag = -1; 144 } 145 spin_unlock_irq(&ji->ag_lock); 146 call_rcu(&inode->i_rcu, jfs_i_callback); 147} 148 149static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf) 150{ 151 struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb); 152 s64 maxinodes; 153 struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap; 154 155 jfs_info("In jfs_statfs"); 156 buf->f_type = JFS_SUPER_MAGIC; 157 buf->f_bsize = sbi->bsize; 158 buf->f_blocks = sbi->bmap->db_mapsize; 159 buf->f_bfree = sbi->bmap->db_nfree; 160 buf->f_bavail = sbi->bmap->db_nfree; 161 /* 162 * If we really return the number of allocated & free inodes, some 163 * applications will fail because they won't see enough free inodes. 164 * We'll try to calculate some guess as to how many inodes we can 165 * really allocate 166 * 167 * buf->f_files = atomic_read(&imap->im_numinos); 168 * buf->f_ffree = atomic_read(&imap->im_numfree); 169 */ 170 maxinodes = min((s64) atomic_read(&imap->im_numinos) + 171 ((sbi->bmap->db_nfree >> imap->im_l2nbperiext) 172 << L2INOSPEREXT), (s64) 0xffffffffLL); 173 buf->f_files = maxinodes; 174 buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) - 175 atomic_read(&imap->im_numfree)); 176 buf->f_fsid.val[0] = (u32)crc32_le(0, sbi->uuid, sizeof(sbi->uuid)/2); 177 buf->f_fsid.val[1] = (u32)crc32_le(0, sbi->uuid + sizeof(sbi->uuid)/2, 178 sizeof(sbi->uuid)/2); 179 180 buf->f_namelen = JFS_NAME_MAX; 181 return 0; 182} 183 184static void jfs_put_super(struct super_block *sb) 185{ 186 struct jfs_sb_info *sbi = JFS_SBI(sb); 187 int rc; 188 189 jfs_info("In jfs_put_super"); 190 191 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); 192 193 rc = jfs_umount(sb); 194 if (rc) 195 jfs_err("jfs_umount failed with return code %d", rc); 196 197 unload_nls(sbi->nls_tab); 198 199 truncate_inode_pages(sbi->direct_inode->i_mapping, 0); 200 iput(sbi->direct_inode); 201 202 kfree(sbi); 203} 204 205enum { 206 Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize, 207 Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota, 208 Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask, 209 Opt_discard, Opt_nodiscard, Opt_discard_minblk 210}; 211 212static const match_table_t tokens = { 213 {Opt_integrity, "integrity"}, 214 {Opt_nointegrity, "nointegrity"}, 215 {Opt_iocharset, "iocharset=%s"}, 216 {Opt_resize, "resize=%u"}, 217 {Opt_resize_nosize, "resize"}, 218 {Opt_errors, "errors=%s"}, 219 {Opt_ignore, "noquota"}, 220 {Opt_ignore, "quota"}, 221 {Opt_usrquota, "usrquota"}, 222 {Opt_grpquota, "grpquota"}, 223 {Opt_uid, "uid=%u"}, 224 {Opt_gid, "gid=%u"}, 225 {Opt_umask, "umask=%u"}, 226 {Opt_discard, "discard"}, 227 {Opt_nodiscard, "nodiscard"}, 228 {Opt_discard_minblk, "discard=%u"}, 229 {Opt_err, NULL} 230}; 231 232static int parse_options(char *options, struct super_block *sb, s64 *newLVSize, 233 int *flag) 234{ 235 void *nls_map = (void *)-1; /* -1: no change; NULL: none */ 236 char *p; 237 struct jfs_sb_info *sbi = JFS_SBI(sb); 238 239 *newLVSize = 0; 240 241 if (!options) 242 return 1; 243 244 while ((p = strsep(&options, ",")) != NULL) { 245 substring_t args[MAX_OPT_ARGS]; 246 int token; 247 if (!*p) 248 continue; 249 250 token = match_token(p, tokens, args); 251 switch (token) { 252 case Opt_integrity: 253 *flag &= ~JFS_NOINTEGRITY; 254 break; 255 case Opt_nointegrity: 256 *flag |= JFS_NOINTEGRITY; 257 break; 258 case Opt_ignore: 259 /* Silently ignore the quota options */ 260 /* Don't do anything ;-) */ 261 break; 262 case Opt_iocharset: 263 if (nls_map && nls_map != (void *) -1) 264 unload_nls(nls_map); 265 if (!strcmp(args[0].from, "none")) 266 nls_map = NULL; 267 else { 268 nls_map = load_nls(args[0].from); 269 if (!nls_map) { 270 pr_err("JFS: charset not found\n"); 271 goto cleanup; 272 } 273 } 274 break; 275 case Opt_resize: 276 { 277 char *resize = args[0].from; 278 int rc = kstrtoll(resize, 0, newLVSize); 279 280 if (rc) 281 goto cleanup; 282 break; 283 } 284 case Opt_resize_nosize: 285 { 286 *newLVSize = sb->s_bdev->bd_inode->i_size >> 287 sb->s_blocksize_bits; 288 if (*newLVSize == 0) 289 pr_err("JFS: Cannot determine volume size\n"); 290 break; 291 } 292 case Opt_errors: 293 { 294 char *errors = args[0].from; 295 if (!errors || !*errors) 296 goto cleanup; 297 if (!strcmp(errors, "continue")) { 298 *flag &= ~JFS_ERR_REMOUNT_RO; 299 *flag &= ~JFS_ERR_PANIC; 300 *flag |= JFS_ERR_CONTINUE; 301 } else if (!strcmp(errors, "remount-ro")) { 302 *flag &= ~JFS_ERR_CONTINUE; 303 *flag &= ~JFS_ERR_PANIC; 304 *flag |= JFS_ERR_REMOUNT_RO; 305 } else if (!strcmp(errors, "panic")) { 306 *flag &= ~JFS_ERR_CONTINUE; 307 *flag &= ~JFS_ERR_REMOUNT_RO; 308 *flag |= JFS_ERR_PANIC; 309 } else { 310 pr_err("JFS: %s is an invalid error handler\n", 311 errors); 312 goto cleanup; 313 } 314 break; 315 } 316 317#ifdef CONFIG_QUOTA 318 case Opt_quota: 319 case Opt_usrquota: 320 *flag |= JFS_USRQUOTA; 321 break; 322 case Opt_grpquota: 323 *flag |= JFS_GRPQUOTA; 324 break; 325#else 326 case Opt_usrquota: 327 case Opt_grpquota: 328 case Opt_quota: 329 pr_err("JFS: quota operations not supported\n"); 330 break; 331#endif 332 case Opt_uid: 333 { 334 char *uid = args[0].from; 335 uid_t val; 336 int rc = kstrtouint(uid, 0, &val); 337 338 if (rc) 339 goto cleanup; 340 sbi->uid = make_kuid(current_user_ns(), val); 341 if (!uid_valid(sbi->uid)) 342 goto cleanup; 343 break; 344 } 345 346 case Opt_gid: 347 { 348 char *gid = args[0].from; 349 gid_t val; 350 int rc = kstrtouint(gid, 0, &val); 351 352 if (rc) 353 goto cleanup; 354 sbi->gid = make_kgid(current_user_ns(), val); 355 if (!gid_valid(sbi->gid)) 356 goto cleanup; 357 break; 358 } 359 360 case Opt_umask: 361 { 362 char *umask = args[0].from; 363 int rc = kstrtouint(umask, 8, &sbi->umask); 364 365 if (rc) 366 goto cleanup; 367 if (sbi->umask & ~0777) { 368 pr_err("JFS: Invalid value of umask\n"); 369 goto cleanup; 370 } 371 break; 372 } 373 374 case Opt_discard: 375 { 376 struct request_queue *q = bdev_get_queue(sb->s_bdev); 377 /* if set to 1, even copying files will cause 378 * trimming :O 379 * -> user has more control over the online trimming 380 */ 381 sbi->minblks_trim = 64; 382 if (blk_queue_discard(q)) 383 *flag |= JFS_DISCARD; 384 else 385 pr_err("JFS: discard option not supported on device\n"); 386 break; 387 } 388 389 case Opt_nodiscard: 390 *flag &= ~JFS_DISCARD; 391 break; 392 393 case Opt_discard_minblk: 394 { 395 struct request_queue *q = bdev_get_queue(sb->s_bdev); 396 char *minblks_trim = args[0].from; 397 int rc; 398 if (blk_queue_discard(q)) { 399 *flag |= JFS_DISCARD; 400 rc = kstrtouint(minblks_trim, 0, 401 &sbi->minblks_trim); 402 if (rc) 403 goto cleanup; 404 } else 405 pr_err("JFS: discard option not supported on device\n"); 406 break; 407 } 408 409 default: 410 printk("jfs: Unrecognized mount option \"%s\" or missing value\n", 411 p); 412 goto cleanup; 413 } 414 } 415 416 if (nls_map != (void *) -1) { 417 /* Discard old (if remount) */ 418 unload_nls(sbi->nls_tab); 419 sbi->nls_tab = nls_map; 420 } 421 return 1; 422 423cleanup: 424 if (nls_map && nls_map != (void *) -1) 425 unload_nls(nls_map); 426 return 0; 427} 428 429static int jfs_remount(struct super_block *sb, int *flags, char *data) 430{ 431 s64 newLVSize = 0; 432 int rc = 0; 433 int flag = JFS_SBI(sb)->flag; 434 int ret; 435 436 sync_filesystem(sb); 437 if (!parse_options(data, sb, &newLVSize, &flag)) 438 return -EINVAL; 439 440 if (newLVSize) { 441 if (sb->s_flags & MS_RDONLY) { 442 pr_err("JFS: resize requires volume to be mounted read-write\n"); 443 return -EROFS; 444 } 445 rc = jfs_extendfs(sb, newLVSize, 0); 446 if (rc) 447 return rc; 448 } 449 450 if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) { 451 /* 452 * Invalidate any previously read metadata. fsck may have 453 * changed the on-disk data since we mounted r/o 454 */ 455 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0); 456 457 JFS_SBI(sb)->flag = flag; 458 ret = jfs_mount_rw(sb, 1); 459 460 /* mark the fs r/w for quota activity */ 461 sb->s_flags &= ~MS_RDONLY; 462 463 dquot_resume(sb, -1); 464 return ret; 465 } 466 if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) { 467 rc = dquot_suspend(sb, -1); 468 if (rc < 0) 469 return rc; 470 rc = jfs_umount_rw(sb); 471 JFS_SBI(sb)->flag = flag; 472 return rc; 473 } 474 if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY)) 475 if (!(sb->s_flags & MS_RDONLY)) { 476 rc = jfs_umount_rw(sb); 477 if (rc) 478 return rc; 479 480 JFS_SBI(sb)->flag = flag; 481 ret = jfs_mount_rw(sb, 1); 482 return ret; 483 } 484 JFS_SBI(sb)->flag = flag; 485 486 return 0; 487} 488 489static int jfs_fill_super(struct super_block *sb, void *data, int silent) 490{ 491 struct jfs_sb_info *sbi; 492 struct inode *inode; 493 int rc; 494 s64 newLVSize = 0; 495 int flag, ret = -EINVAL; 496 497 jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags); 498 499 if (!new_valid_dev(sb->s_bdev->bd_dev)) 500 return -EOVERFLOW; 501 502 sbi = kzalloc(sizeof(struct jfs_sb_info), GFP_KERNEL); 503 if (!sbi) 504 return -ENOMEM; 505 506 sb->s_fs_info = sbi; 507 sb->s_max_links = JFS_LINK_MAX; 508 sbi->sb = sb; 509 sbi->uid = INVALID_UID; 510 sbi->gid = INVALID_GID; 511 sbi->umask = -1; 512 513 /* initialize the mount flag and determine the default error handler */ 514 flag = JFS_ERR_REMOUNT_RO; 515 516 if (!parse_options((char *) data, sb, &newLVSize, &flag)) 517 goto out_kfree; 518 sbi->flag = flag; 519 520#ifdef CONFIG_JFS_POSIX_ACL 521 sb->s_flags |= MS_POSIXACL; 522#endif 523 524 if (newLVSize) { 525 pr_err("resize option for remount only\n"); 526 goto out_kfree; 527 } 528 529 /* 530 * Initialize blocksize to 4K. 531 */ 532 sb_set_blocksize(sb, PSIZE); 533 534 /* 535 * Set method vectors. 536 */ 537 sb->s_op = &jfs_super_operations; 538 sb->s_export_op = &jfs_export_operations; 539 sb->s_xattr = jfs_xattr_handlers; 540#ifdef CONFIG_QUOTA 541 sb->dq_op = &dquot_operations; 542 sb->s_qcop = &dquot_quotactl_ops; 543 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; 544#endif 545 546 /* 547 * Initialize direct-mapping inode/address-space 548 */ 549 inode = new_inode(sb); 550 if (inode == NULL) { 551 ret = -ENOMEM; 552 goto out_unload; 553 } 554 inode->i_ino = 0; 555 inode->i_size = sb->s_bdev->bd_inode->i_size; 556 inode->i_mapping->a_ops = &jfs_metapage_aops; 557 hlist_add_fake(&inode->i_hash); 558 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS); 559 560 sbi->direct_inode = inode; 561 562 rc = jfs_mount(sb); 563 if (rc) { 564 if (!silent) 565 jfs_err("jfs_mount failed w/return code = %d", rc); 566 goto out_mount_failed; 567 } 568 if (sb->s_flags & MS_RDONLY) 569 sbi->log = NULL; 570 else { 571 rc = jfs_mount_rw(sb, 0); 572 if (rc) { 573 if (!silent) { 574 jfs_err("jfs_mount_rw failed, return code = %d", 575 rc); 576 } 577 goto out_no_rw; 578 } 579 } 580 581 sb->s_magic = JFS_SUPER_MAGIC; 582 583 if (sbi->mntflag & JFS_OS2) 584 sb->s_d_op = &jfs_ci_dentry_operations; 585 586 inode = jfs_iget(sb, ROOT_I); 587 if (IS_ERR(inode)) { 588 ret = PTR_ERR(inode); 589 goto out_no_rw; 590 } 591 sb->s_root = d_make_root(inode); 592 if (!sb->s_root) 593 goto out_no_root; 594 595 /* logical blocks are represented by 40 bits in pxd_t, etc. */ 596 sb->s_maxbytes = ((u64) sb->s_blocksize) << 40; 597#if BITS_PER_LONG == 32 598 /* 599 * Page cache is indexed by long. 600 * I would use MAX_LFS_FILESIZE, but it's only half as big 601 */ 602 sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, 603 (u64)sb->s_maxbytes); 604#endif 605 sb->s_time_gran = 1; 606 return 0; 607 608out_no_root: 609 jfs_err("jfs_read_super: get root dentry failed"); 610 611out_no_rw: 612 rc = jfs_umount(sb); 613 if (rc) 614 jfs_err("jfs_umount failed with return code %d", rc); 615out_mount_failed: 616 filemap_write_and_wait(sbi->direct_inode->i_mapping); 617 truncate_inode_pages(sbi->direct_inode->i_mapping, 0); 618 make_bad_inode(sbi->direct_inode); 619 iput(sbi->direct_inode); 620 sbi->direct_inode = NULL; 621out_unload: 622 unload_nls(sbi->nls_tab); 623out_kfree: 624 kfree(sbi); 625 return ret; 626} 627 628static int jfs_freeze(struct super_block *sb) 629{ 630 struct jfs_sb_info *sbi = JFS_SBI(sb); 631 struct jfs_log *log = sbi->log; 632 int rc = 0; 633 634 if (!(sb->s_flags & MS_RDONLY)) { 635 txQuiesce(sb); 636 rc = lmLogShutdown(log); 637 if (rc) { 638 jfs_error(sb, "lmLogShutdown failed\n"); 639 640 /* let operations fail rather than hang */ 641 txResume(sb); 642 643 return rc; 644 } 645 rc = updateSuper(sb, FM_CLEAN); 646 if (rc) { 647 jfs_err("jfs_freeze: updateSuper failed\n"); 648 /* 649 * Don't fail here. Everything succeeded except 650 * marking the superblock clean, so there's really 651 * no harm in leaving it frozen for now. 652 */ 653 } 654 } 655 return 0; 656} 657 658static int jfs_unfreeze(struct super_block *sb) 659{ 660 struct jfs_sb_info *sbi = JFS_SBI(sb); 661 struct jfs_log *log = sbi->log; 662 int rc = 0; 663 664 if (!(sb->s_flags & MS_RDONLY)) { 665 rc = updateSuper(sb, FM_MOUNT); 666 if (rc) { 667 jfs_error(sb, "updateSuper failed\n"); 668 goto out; 669 } 670 rc = lmLogInit(log); 671 if (rc) 672 jfs_error(sb, "lmLogInit failed\n"); 673out: 674 txResume(sb); 675 } 676 return rc; 677} 678 679static struct dentry *jfs_do_mount(struct file_system_type *fs_type, 680 int flags, const char *dev_name, void *data) 681{ 682 return mount_bdev(fs_type, flags, dev_name, data, jfs_fill_super); 683} 684 685static int jfs_sync_fs(struct super_block *sb, int wait) 686{ 687 struct jfs_log *log = JFS_SBI(sb)->log; 688 689 /* log == NULL indicates read-only mount */ 690 if (log) { 691 /* 692 * Write quota structures to quota file, sync_blockdev() will 693 * write them to disk later 694 */ 695 dquot_writeback_dquots(sb, -1); 696 jfs_flush_journal(log, wait); 697 jfs_syncpt(log, 0); 698 } 699 700 return 0; 701} 702 703static int jfs_show_options(struct seq_file *seq, struct dentry *root) 704{ 705 struct jfs_sb_info *sbi = JFS_SBI(root->d_sb); 706 707 if (uid_valid(sbi->uid)) 708 seq_printf(seq, ",uid=%d", from_kuid(&init_user_ns, sbi->uid)); 709 if (gid_valid(sbi->gid)) 710 seq_printf(seq, ",gid=%d", from_kgid(&init_user_ns, sbi->gid)); 711 if (sbi->umask != -1) 712 seq_printf(seq, ",umask=%03o", sbi->umask); 713 if (sbi->flag & JFS_NOINTEGRITY) 714 seq_puts(seq, ",nointegrity"); 715 if (sbi->flag & JFS_DISCARD) 716 seq_printf(seq, ",discard=%u", sbi->minblks_trim); 717 if (sbi->nls_tab) 718 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset); 719 if (sbi->flag & JFS_ERR_CONTINUE) 720 seq_printf(seq, ",errors=continue"); 721 if (sbi->flag & JFS_ERR_PANIC) 722 seq_printf(seq, ",errors=panic"); 723 724#ifdef CONFIG_QUOTA 725 if (sbi->flag & JFS_USRQUOTA) 726 seq_puts(seq, ",usrquota"); 727 728 if (sbi->flag & JFS_GRPQUOTA) 729 seq_puts(seq, ",grpquota"); 730#endif 731 732 return 0; 733} 734 735#ifdef CONFIG_QUOTA 736 737/* Read data from quotafile - avoid pagecache and such because we cannot afford 738 * acquiring the locks... As quota files are never truncated and quota code 739 * itself serializes the operations (and no one else should touch the files) 740 * we don't have to be afraid of races */ 741static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data, 742 size_t len, loff_t off) 743{ 744 struct inode *inode = sb_dqopt(sb)->files[type]; 745 sector_t blk = off >> sb->s_blocksize_bits; 746 int err = 0; 747 int offset = off & (sb->s_blocksize - 1); 748 int tocopy; 749 size_t toread; 750 struct buffer_head tmp_bh; 751 struct buffer_head *bh; 752 loff_t i_size = i_size_read(inode); 753 754 if (off > i_size) 755 return 0; 756 if (off+len > i_size) 757 len = i_size-off; 758 toread = len; 759 while (toread > 0) { 760 tocopy = sb->s_blocksize - offset < toread ? 761 sb->s_blocksize - offset : toread; 762 763 tmp_bh.b_state = 0; 764 tmp_bh.b_size = 1 << inode->i_blkbits; 765 err = jfs_get_block(inode, blk, &tmp_bh, 0); 766 if (err) 767 return err; 768 if (!buffer_mapped(&tmp_bh)) /* A hole? */ 769 memset(data, 0, tocopy); 770 else { 771 bh = sb_bread(sb, tmp_bh.b_blocknr); 772 if (!bh) 773 return -EIO; 774 memcpy(data, bh->b_data+offset, tocopy); 775 brelse(bh); 776 } 777 offset = 0; 778 toread -= tocopy; 779 data += tocopy; 780 blk++; 781 } 782 return len; 783} 784 785/* Write to quotafile */ 786static ssize_t jfs_quota_write(struct super_block *sb, int type, 787 const char *data, size_t len, loff_t off) 788{ 789 struct inode *inode = sb_dqopt(sb)->files[type]; 790 sector_t blk = off >> sb->s_blocksize_bits; 791 int err = 0; 792 int offset = off & (sb->s_blocksize - 1); 793 int tocopy; 794 size_t towrite = len; 795 struct buffer_head tmp_bh; 796 struct buffer_head *bh; 797 798 mutex_lock(&inode->i_mutex); 799 while (towrite > 0) { 800 tocopy = sb->s_blocksize - offset < towrite ? 801 sb->s_blocksize - offset : towrite; 802 803 tmp_bh.b_state = 0; 804 tmp_bh.b_size = 1 << inode->i_blkbits; 805 err = jfs_get_block(inode, blk, &tmp_bh, 1); 806 if (err) 807 goto out; 808 if (offset || tocopy != sb->s_blocksize) 809 bh = sb_bread(sb, tmp_bh.b_blocknr); 810 else 811 bh = sb_getblk(sb, tmp_bh.b_blocknr); 812 if (!bh) { 813 err = -EIO; 814 goto out; 815 } 816 lock_buffer(bh); 817 memcpy(bh->b_data+offset, data, tocopy); 818 flush_dcache_page(bh->b_page); 819 set_buffer_uptodate(bh); 820 mark_buffer_dirty(bh); 821 unlock_buffer(bh); 822 brelse(bh); 823 offset = 0; 824 towrite -= tocopy; 825 data += tocopy; 826 blk++; 827 } 828out: 829 if (len == towrite) { 830 mutex_unlock(&inode->i_mutex); 831 return err; 832 } 833 if (inode->i_size < off+len-towrite) 834 i_size_write(inode, off+len-towrite); 835 inode->i_version++; 836 inode->i_mtime = inode->i_ctime = CURRENT_TIME; 837 mark_inode_dirty(inode); 838 mutex_unlock(&inode->i_mutex); 839 return len - towrite; 840} 841 842static struct dquot **jfs_get_dquots(struct inode *inode) 843{ 844 return JFS_IP(inode)->i_dquot; 845} 846#endif 847 848static const struct super_operations jfs_super_operations = { 849 .alloc_inode = jfs_alloc_inode, 850 .destroy_inode = jfs_destroy_inode, 851 .dirty_inode = jfs_dirty_inode, 852 .write_inode = jfs_write_inode, 853 .evict_inode = jfs_evict_inode, 854 .put_super = jfs_put_super, 855 .sync_fs = jfs_sync_fs, 856 .freeze_fs = jfs_freeze, 857 .unfreeze_fs = jfs_unfreeze, 858 .statfs = jfs_statfs, 859 .remount_fs = jfs_remount, 860 .show_options = jfs_show_options, 861#ifdef CONFIG_QUOTA 862 .quota_read = jfs_quota_read, 863 .quota_write = jfs_quota_write, 864 .get_dquots = jfs_get_dquots, 865#endif 866}; 867 868static const struct export_operations jfs_export_operations = { 869 .fh_to_dentry = jfs_fh_to_dentry, 870 .fh_to_parent = jfs_fh_to_parent, 871 .get_parent = jfs_get_parent, 872}; 873 874static struct file_system_type jfs_fs_type = { 875 .owner = THIS_MODULE, 876 .name = "jfs", 877 .mount = jfs_do_mount, 878 .kill_sb = kill_block_super, 879 .fs_flags = FS_REQUIRES_DEV, 880}; 881MODULE_ALIAS_FS("jfs"); 882 883static void init_once(void *foo) 884{ 885 struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo; 886 887 memset(jfs_ip, 0, sizeof(struct jfs_inode_info)); 888 INIT_LIST_HEAD(&jfs_ip->anon_inode_list); 889 init_rwsem(&jfs_ip->rdwrlock); 890 mutex_init(&jfs_ip->commit_mutex); 891 init_rwsem(&jfs_ip->xattr_sem); 892 spin_lock_init(&jfs_ip->ag_lock); 893 jfs_ip->active_ag = -1; 894 inode_init_once(&jfs_ip->vfs_inode); 895} 896 897static int __init init_jfs_fs(void) 898{ 899 int i; 900 int rc; 901 902 jfs_inode_cachep = 903 kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0, 904 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, 905 init_once); 906 if (jfs_inode_cachep == NULL) 907 return -ENOMEM; 908 909 /* 910 * Metapage initialization 911 */ 912 rc = metapage_init(); 913 if (rc) { 914 jfs_err("metapage_init failed w/rc = %d", rc); 915 goto free_slab; 916 } 917 918 /* 919 * Transaction Manager initialization 920 */ 921 rc = txInit(); 922 if (rc) { 923 jfs_err("txInit failed w/rc = %d", rc); 924 goto free_metapage; 925 } 926 927 /* 928 * I/O completion thread (endio) 929 */ 930 jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO"); 931 if (IS_ERR(jfsIOthread)) { 932 rc = PTR_ERR(jfsIOthread); 933 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 934 goto end_txmngr; 935 } 936 937 if (commit_threads < 1) 938 commit_threads = num_online_cpus(); 939 if (commit_threads > MAX_COMMIT_THREADS) 940 commit_threads = MAX_COMMIT_THREADS; 941 942 for (i = 0; i < commit_threads; i++) { 943 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, 944 "jfsCommit"); 945 if (IS_ERR(jfsCommitThread[i])) { 946 rc = PTR_ERR(jfsCommitThread[i]); 947 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 948 commit_threads = i; 949 goto kill_committask; 950 } 951 } 952 953 jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync"); 954 if (IS_ERR(jfsSyncThread)) { 955 rc = PTR_ERR(jfsSyncThread); 956 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 957 goto kill_committask; 958 } 959 960#ifdef PROC_FS_JFS 961 jfs_proc_init(); 962#endif 963 964 rc = register_filesystem(&jfs_fs_type); 965 if (!rc) 966 return 0; 967 968#ifdef PROC_FS_JFS 969 jfs_proc_clean(); 970#endif 971 kthread_stop(jfsSyncThread); 972kill_committask: 973 for (i = 0; i < commit_threads; i++) 974 kthread_stop(jfsCommitThread[i]); 975 kthread_stop(jfsIOthread); 976end_txmngr: 977 txExit(); 978free_metapage: 979 metapage_exit(); 980free_slab: 981 kmem_cache_destroy(jfs_inode_cachep); 982 return rc; 983} 984 985static void __exit exit_jfs_fs(void) 986{ 987 int i; 988 989 jfs_info("exit_jfs_fs called"); 990 991 txExit(); 992 metapage_exit(); 993 994 kthread_stop(jfsIOthread); 995 for (i = 0; i < commit_threads; i++) 996 kthread_stop(jfsCommitThread[i]); 997 kthread_stop(jfsSyncThread); 998#ifdef PROC_FS_JFS 999 jfs_proc_clean(); 1000#endif 1001 unregister_filesystem(&jfs_fs_type); 1002 1003 /* 1004 * Make sure all delayed rcu free inodes are flushed before we 1005 * destroy cache. 1006 */ 1007 rcu_barrier(); 1008 kmem_cache_destroy(jfs_inode_cachep); 1009} 1010 1011module_init(init_jfs_fs) 1012module_exit(exit_jfs_fs) 1013