1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * Copyright (C) International Business Machines Corp., 2000-2004 4 * Portions Copyright (C) Christoph Hellwig, 2001-2002 5 */ 6 7#include <linux/fs.h> 8#include <linux/module.h> 9#include <linux/parser.h> 10#include <linux/completion.h> 11#include <linux/vfs.h> 12#include <linux/quotaops.h> 13#include <linux/mount.h> 14#include <linux/moduleparam.h> 15#include <linux/kthread.h> 16#include <linux/posix_acl.h> 17#include <linux/buffer_head.h> 18#include <linux/exportfs.h> 19#include <linux/crc32.h> 20#include <linux/slab.h> 21#include <linux/uaccess.h> 22#include <linux/seq_file.h> 23#include <linux/blkdev.h> 24 25#include "jfs_incore.h" 26#include "jfs_filsys.h" 27#include "jfs_inode.h" 28#include "jfs_metapage.h" 29#include "jfs_superblock.h" 30#include "jfs_dmap.h" 31#include "jfs_imap.h" 32#include "jfs_acl.h" 33#include "jfs_debug.h" 34#include "jfs_xattr.h" 35#include "jfs_dinode.h" 36 37MODULE_DESCRIPTION("The Journaled Filesystem (JFS)"); 38MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM"); 39MODULE_LICENSE("GPL"); 40 41static struct kmem_cache *jfs_inode_cachep; 42 43static const struct super_operations jfs_super_operations; 44static const struct export_operations jfs_export_operations; 45static struct file_system_type jfs_fs_type; 46 47#define MAX_COMMIT_THREADS 64 48static int commit_threads; 49module_param(commit_threads, int, 0); 50MODULE_PARM_DESC(commit_threads, "Number of commit threads"); 51 52static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS]; 53struct task_struct *jfsIOthread; 54struct task_struct *jfsSyncThread; 55 56#ifdef CONFIG_JFS_DEBUG 57int jfsloglevel = JFS_LOGLEVEL_WARN; 58module_param(jfsloglevel, int, 0644); 59MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)"); 60#endif 61 62static void jfs_handle_error(struct super_block *sb) 63{ 64 struct jfs_sb_info *sbi = JFS_SBI(sb); 65 66 if (sb_rdonly(sb)) 67 return; 68 69 updateSuper(sb, FM_DIRTY); 70 71 if (sbi->flag & JFS_ERR_PANIC) 72 panic("JFS (device %s): panic forced after error\n", 73 sb->s_id); 74 else if (sbi->flag & JFS_ERR_REMOUNT_RO) { 75 jfs_err("ERROR: (device %s): remounting filesystem as read-only", 76 sb->s_id); 77 sb->s_flags |= SB_RDONLY; 78 } 79 80 /* nothing is done for continue beyond marking the superblock dirty */ 81} 82 83void jfs_error(struct super_block *sb, const char *fmt, ...) 84{ 85 struct va_format vaf; 86 va_list args; 87 88 va_start(args, fmt); 89 90 vaf.fmt = fmt; 91 vaf.va = &args; 92 93 pr_err("ERROR: (device %s): %ps: %pV\n", 94 sb->s_id, __builtin_return_address(0), &vaf); 95 96 va_end(args); 97 98 jfs_handle_error(sb); 99} 100 101static struct inode *jfs_alloc_inode(struct super_block *sb) 102{ 103 struct jfs_inode_info *jfs_inode; 104 105 jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS); 106 if (!jfs_inode) 107 return NULL; 108#ifdef CONFIG_QUOTA 109 memset(&jfs_inode->i_dquot, 0, sizeof(jfs_inode->i_dquot)); 110#endif 111 return &jfs_inode->vfs_inode; 112} 113 114static void jfs_free_inode(struct inode *inode) 115{ 116 kmem_cache_free(jfs_inode_cachep, JFS_IP(inode)); 117} 118 119static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf) 120{ 121 struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb); 122 s64 maxinodes; 123 struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap; 124 125 jfs_info("In jfs_statfs"); 126 buf->f_type = JFS_SUPER_MAGIC; 127 buf->f_bsize = sbi->bsize; 128 buf->f_blocks = sbi->bmap->db_mapsize; 129 buf->f_bfree = sbi->bmap->db_nfree; 130 buf->f_bavail = sbi->bmap->db_nfree; 131 /* 132 * If we really return the number of allocated & free inodes, some 133 * applications will fail because they won't see enough free inodes. 134 * We'll try to calculate some guess as to how many inodes we can 135 * really allocate 136 * 137 * buf->f_files = atomic_read(&imap->im_numinos); 138 * buf->f_ffree = atomic_read(&imap->im_numfree); 139 */ 140 maxinodes = min((s64) atomic_read(&imap->im_numinos) + 141 ((sbi->bmap->db_nfree >> imap->im_l2nbperiext) 142 << L2INOSPEREXT), (s64) 0xffffffffLL); 143 buf->f_files = maxinodes; 144 buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) - 145 atomic_read(&imap->im_numfree)); 146 buf->f_fsid.val[0] = crc32_le(0, (char *)&sbi->uuid, 147 sizeof(sbi->uuid)/2); 148 buf->f_fsid.val[1] = crc32_le(0, 149 (char *)&sbi->uuid + sizeof(sbi->uuid)/2, 150 sizeof(sbi->uuid)/2); 151 152 buf->f_namelen = JFS_NAME_MAX; 153 return 0; 154} 155 156#ifdef CONFIG_QUOTA 157static int jfs_quota_off(struct super_block *sb, int type); 158static int jfs_quota_on(struct super_block *sb, int type, int format_id, 159 const struct path *path); 160 161static void jfs_quota_off_umount(struct super_block *sb) 162{ 163 int type; 164 165 for (type = 0; type < MAXQUOTAS; type++) 166 jfs_quota_off(sb, type); 167} 168 169static const struct quotactl_ops jfs_quotactl_ops = { 170 .quota_on = jfs_quota_on, 171 .quota_off = jfs_quota_off, 172 .quota_sync = dquot_quota_sync, 173 .get_state = dquot_get_state, 174 .set_info = dquot_set_dqinfo, 175 .get_dqblk = dquot_get_dqblk, 176 .set_dqblk = dquot_set_dqblk, 177 .get_nextdqblk = dquot_get_next_dqblk, 178}; 179#else 180static inline void jfs_quota_off_umount(struct super_block *sb) 181{ 182} 183#endif 184 185static void jfs_put_super(struct super_block *sb) 186{ 187 struct jfs_sb_info *sbi = JFS_SBI(sb); 188 int rc; 189 190 jfs_info("In jfs_put_super"); 191 192 jfs_quota_off_umount(sb); 193 194 rc = jfs_umount(sb); 195 if (rc) 196 jfs_err("jfs_umount failed with return code %d", rc); 197 198 unload_nls(sbi->nls_tab); 199 200 truncate_inode_pages(sbi->direct_inode->i_mapping, 0); 201 iput(sbi->direct_inode); 202 203 kfree(sbi); 204} 205 206enum { 207 Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize, 208 Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota, 209 Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask, 210 Opt_discard, Opt_nodiscard, Opt_discard_minblk 211}; 212 213static const match_table_t tokens = { 214 {Opt_integrity, "integrity"}, 215 {Opt_nointegrity, "nointegrity"}, 216 {Opt_iocharset, "iocharset=%s"}, 217 {Opt_resize, "resize=%u"}, 218 {Opt_resize_nosize, "resize"}, 219 {Opt_errors, "errors=%s"}, 220 {Opt_ignore, "noquota"}, 221 {Opt_quota, "quota"}, 222 {Opt_usrquota, "usrquota"}, 223 {Opt_grpquota, "grpquota"}, 224 {Opt_uid, "uid=%u"}, 225 {Opt_gid, "gid=%u"}, 226 {Opt_umask, "umask=%u"}, 227 {Opt_discard, "discard"}, 228 {Opt_nodiscard, "nodiscard"}, 229 {Opt_discard_minblk, "discard=%u"}, 230 {Opt_err, NULL} 231}; 232 233static int parse_options(char *options, struct super_block *sb, s64 *newLVSize, 234 int *flag) 235{ 236 void *nls_map = (void *)-1; /* -1: no change; NULL: none */ 237 char *p; 238 struct jfs_sb_info *sbi = JFS_SBI(sb); 239 240 *newLVSize = 0; 241 242 if (!options) 243 return 1; 244 245 while ((p = strsep(&options, ",")) != NULL) { 246 substring_t args[MAX_OPT_ARGS]; 247 int token; 248 if (!*p) 249 continue; 250 251 token = match_token(p, tokens, args); 252 switch (token) { 253 case Opt_integrity: 254 *flag &= ~JFS_NOINTEGRITY; 255 break; 256 case Opt_nointegrity: 257 *flag |= JFS_NOINTEGRITY; 258 break; 259 case Opt_ignore: 260 /* Silently ignore the quota options */ 261 /* Don't do anything ;-) */ 262 break; 263 case Opt_iocharset: 264 if (nls_map && nls_map != (void *) -1) 265 unload_nls(nls_map); 266 if (!strcmp(args[0].from, "none")) 267 nls_map = NULL; 268 else { 269 nls_map = load_nls(args[0].from); 270 if (!nls_map) { 271 pr_err("JFS: charset not found\n"); 272 goto cleanup; 273 } 274 } 275 break; 276 case Opt_resize: 277 { 278 char *resize = args[0].from; 279 int rc = kstrtoll(resize, 0, newLVSize); 280 281 if (rc) 282 goto cleanup; 283 break; 284 } 285 case Opt_resize_nosize: 286 { 287 *newLVSize = i_size_read(sb->s_bdev->bd_inode) >> 288 sb->s_blocksize_bits; 289 if (*newLVSize == 0) 290 pr_err("JFS: Cannot determine volume size\n"); 291 break; 292 } 293 case Opt_errors: 294 { 295 char *errors = args[0].from; 296 if (!errors || !*errors) 297 goto cleanup; 298 if (!strcmp(errors, "continue")) { 299 *flag &= ~JFS_ERR_REMOUNT_RO; 300 *flag &= ~JFS_ERR_PANIC; 301 *flag |= JFS_ERR_CONTINUE; 302 } else if (!strcmp(errors, "remount-ro")) { 303 *flag &= ~JFS_ERR_CONTINUE; 304 *flag &= ~JFS_ERR_PANIC; 305 *flag |= JFS_ERR_REMOUNT_RO; 306 } else if (!strcmp(errors, "panic")) { 307 *flag &= ~JFS_ERR_CONTINUE; 308 *flag &= ~JFS_ERR_REMOUNT_RO; 309 *flag |= JFS_ERR_PANIC; 310 } else { 311 pr_err("JFS: %s is an invalid error handler\n", 312 errors); 313 goto cleanup; 314 } 315 break; 316 } 317 318#ifdef CONFIG_QUOTA 319 case Opt_quota: 320 case Opt_usrquota: 321 *flag |= JFS_USRQUOTA; 322 break; 323 case Opt_grpquota: 324 *flag |= JFS_GRPQUOTA; 325 break; 326#else 327 case Opt_usrquota: 328 case Opt_grpquota: 329 case Opt_quota: 330 pr_err("JFS: quota operations not supported\n"); 331 break; 332#endif 333 case Opt_uid: 334 { 335 char *uid = args[0].from; 336 uid_t val; 337 int rc = kstrtouint(uid, 0, &val); 338 339 if (rc) 340 goto cleanup; 341 sbi->uid = make_kuid(current_user_ns(), val); 342 if (!uid_valid(sbi->uid)) 343 goto cleanup; 344 break; 345 } 346 347 case Opt_gid: 348 { 349 char *gid = args[0].from; 350 gid_t val; 351 int rc = kstrtouint(gid, 0, &val); 352 353 if (rc) 354 goto cleanup; 355 sbi->gid = make_kgid(current_user_ns(), val); 356 if (!gid_valid(sbi->gid)) 357 goto cleanup; 358 break; 359 } 360 361 case Opt_umask: 362 { 363 char *umask = args[0].from; 364 int rc = kstrtouint(umask, 8, &sbi->umask); 365 366 if (rc) 367 goto cleanup; 368 if (sbi->umask & ~0777) { 369 pr_err("JFS: Invalid value of umask\n"); 370 goto cleanup; 371 } 372 break; 373 } 374 375 case Opt_discard: 376 { 377 struct request_queue *q = bdev_get_queue(sb->s_bdev); 378 /* if set to 1, even copying files will cause 379 * trimming :O 380 * -> user has more control over the online trimming 381 */ 382 sbi->minblks_trim = 64; 383 if (blk_queue_discard(q)) 384 *flag |= JFS_DISCARD; 385 else 386 pr_err("JFS: discard option not supported on device\n"); 387 break; 388 } 389 390 case Opt_nodiscard: 391 *flag &= ~JFS_DISCARD; 392 break; 393 394 case Opt_discard_minblk: 395 { 396 struct request_queue *q = bdev_get_queue(sb->s_bdev); 397 char *minblks_trim = args[0].from; 398 int rc; 399 if (blk_queue_discard(q)) { 400 *flag |= JFS_DISCARD; 401 rc = kstrtouint(minblks_trim, 0, 402 &sbi->minblks_trim); 403 if (rc) 404 goto cleanup; 405 } else 406 pr_err("JFS: discard option not supported on device\n"); 407 break; 408 } 409 410 default: 411 printk("jfs: Unrecognized mount option \"%s\" or missing value\n", 412 p); 413 goto cleanup; 414 } 415 } 416 417 if (nls_map != (void *) -1) { 418 /* Discard old (if remount) */ 419 unload_nls(sbi->nls_tab); 420 sbi->nls_tab = nls_map; 421 } 422 return 1; 423 424cleanup: 425 if (nls_map && nls_map != (void *) -1) 426 unload_nls(nls_map); 427 return 0; 428} 429 430static int jfs_remount(struct super_block *sb, int *flags, char *data) 431{ 432 s64 newLVSize = 0; 433 int rc = 0; 434 int flag = JFS_SBI(sb)->flag; 435 int ret; 436 437 sync_filesystem(sb); 438 if (!parse_options(data, sb, &newLVSize, &flag)) 439 return -EINVAL; 440 441 if (newLVSize) { 442 if (sb_rdonly(sb)) { 443 pr_err("JFS: resize requires volume to be mounted read-write\n"); 444 return -EROFS; 445 } 446 rc = jfs_extendfs(sb, newLVSize, 0); 447 if (rc) 448 return rc; 449 } 450 451 if (sb_rdonly(sb) && !(*flags & SB_RDONLY)) { 452 /* 453 * Invalidate any previously read metadata. fsck may have 454 * changed the on-disk data since we mounted r/o 455 */ 456 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0); 457 458 JFS_SBI(sb)->flag = flag; 459 ret = jfs_mount_rw(sb, 1); 460 461 /* mark the fs r/w for quota activity */ 462 sb->s_flags &= ~SB_RDONLY; 463 464 dquot_resume(sb, -1); 465 return ret; 466 } 467 if (!sb_rdonly(sb) && (*flags & SB_RDONLY)) { 468 rc = dquot_suspend(sb, -1); 469 if (rc < 0) 470 return rc; 471 rc = jfs_umount_rw(sb); 472 JFS_SBI(sb)->flag = flag; 473 return rc; 474 } 475 if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY)) 476 if (!sb_rdonly(sb)) { 477 rc = jfs_umount_rw(sb); 478 if (rc) 479 return rc; 480 481 JFS_SBI(sb)->flag = flag; 482 ret = jfs_mount_rw(sb, 1); 483 return ret; 484 } 485 JFS_SBI(sb)->flag = flag; 486 487 return 0; 488} 489 490static int jfs_fill_super(struct super_block *sb, void *data, int silent) 491{ 492 struct jfs_sb_info *sbi; 493 struct inode *inode; 494 int rc; 495 s64 newLVSize = 0; 496 int flag, ret = -EINVAL; 497 498 jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags); 499 500 sbi = kzalloc(sizeof(struct jfs_sb_info), GFP_KERNEL); 501 if (!sbi) 502 return -ENOMEM; 503 504 sb->s_fs_info = sbi; 505 sb->s_max_links = JFS_LINK_MAX; 506 sb->s_time_min = 0; 507 sb->s_time_max = U32_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 |= SB_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 = &jfs_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 = i_size_read(sb->s_bdev->bd_inode); 556 inode->i_mapping->a_ops = &jfs_metapage_aops; 557 inode_fake_hash(inode); 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_rdonly(sb)) 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 * and page cache is indexed by long 597 */ 598 sb->s_maxbytes = min(((loff_t)sb->s_blocksize) << 40, MAX_LFS_FILESIZE); 599 sb->s_time_gran = 1; 600 return 0; 601 602out_no_root: 603 jfs_err("jfs_read_super: get root dentry failed"); 604 605out_no_rw: 606 rc = jfs_umount(sb); 607 if (rc) 608 jfs_err("jfs_umount failed with return code %d", rc); 609out_mount_failed: 610 filemap_write_and_wait(sbi->direct_inode->i_mapping); 611 truncate_inode_pages(sbi->direct_inode->i_mapping, 0); 612 make_bad_inode(sbi->direct_inode); 613 iput(sbi->direct_inode); 614 sbi->direct_inode = NULL; 615out_unload: 616 unload_nls(sbi->nls_tab); 617out_kfree: 618 kfree(sbi); 619 return ret; 620} 621 622static int jfs_freeze(struct super_block *sb) 623{ 624 struct jfs_sb_info *sbi = JFS_SBI(sb); 625 struct jfs_log *log = sbi->log; 626 int rc = 0; 627 628 if (!sb_rdonly(sb)) { 629 txQuiesce(sb); 630 rc = lmLogShutdown(log); 631 if (rc) { 632 jfs_error(sb, "lmLogShutdown failed\n"); 633 634 /* let operations fail rather than hang */ 635 txResume(sb); 636 637 return rc; 638 } 639 rc = updateSuper(sb, FM_CLEAN); 640 if (rc) { 641 jfs_err("jfs_freeze: updateSuper failed"); 642 /* 643 * Don't fail here. Everything succeeded except 644 * marking the superblock clean, so there's really 645 * no harm in leaving it frozen for now. 646 */ 647 } 648 } 649 return 0; 650} 651 652static int jfs_unfreeze(struct super_block *sb) 653{ 654 struct jfs_sb_info *sbi = JFS_SBI(sb); 655 struct jfs_log *log = sbi->log; 656 int rc = 0; 657 658 if (!sb_rdonly(sb)) { 659 rc = updateSuper(sb, FM_MOUNT); 660 if (rc) { 661 jfs_error(sb, "updateSuper failed\n"); 662 goto out; 663 } 664 rc = lmLogInit(log); 665 if (rc) 666 jfs_error(sb, "lmLogInit failed\n"); 667out: 668 txResume(sb); 669 } 670 return rc; 671} 672 673static struct dentry *jfs_do_mount(struct file_system_type *fs_type, 674 int flags, const char *dev_name, void *data) 675{ 676 return mount_bdev(fs_type, flags, dev_name, data, jfs_fill_super); 677} 678 679static int jfs_sync_fs(struct super_block *sb, int wait) 680{ 681 struct jfs_log *log = JFS_SBI(sb)->log; 682 683 /* log == NULL indicates read-only mount */ 684 if (log) { 685 /* 686 * Write quota structures to quota file, sync_blockdev() will 687 * write them to disk later 688 */ 689 dquot_writeback_dquots(sb, -1); 690 jfs_flush_journal(log, wait); 691 jfs_syncpt(log, 0); 692 } 693 694 return 0; 695} 696 697static int jfs_show_options(struct seq_file *seq, struct dentry *root) 698{ 699 struct jfs_sb_info *sbi = JFS_SBI(root->d_sb); 700 701 if (uid_valid(sbi->uid)) 702 seq_printf(seq, ",uid=%d", from_kuid(&init_user_ns, sbi->uid)); 703 if (gid_valid(sbi->gid)) 704 seq_printf(seq, ",gid=%d", from_kgid(&init_user_ns, sbi->gid)); 705 if (sbi->umask != -1) 706 seq_printf(seq, ",umask=%03o", sbi->umask); 707 if (sbi->flag & JFS_NOINTEGRITY) 708 seq_puts(seq, ",nointegrity"); 709 if (sbi->flag & JFS_DISCARD) 710 seq_printf(seq, ",discard=%u", sbi->minblks_trim); 711 if (sbi->nls_tab) 712 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset); 713 if (sbi->flag & JFS_ERR_CONTINUE) 714 seq_printf(seq, ",errors=continue"); 715 if (sbi->flag & JFS_ERR_PANIC) 716 seq_printf(seq, ",errors=panic"); 717 718#ifdef CONFIG_QUOTA 719 if (sbi->flag & JFS_USRQUOTA) 720 seq_puts(seq, ",usrquota"); 721 722 if (sbi->flag & JFS_GRPQUOTA) 723 seq_puts(seq, ",grpquota"); 724#endif 725 726 return 0; 727} 728 729#ifdef CONFIG_QUOTA 730 731/* Read data from quotafile - avoid pagecache and such because we cannot afford 732 * acquiring the locks... As quota files are never truncated and quota code 733 * itself serializes the operations (and no one else should touch the files) 734 * we don't have to be afraid of races */ 735static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data, 736 size_t len, loff_t off) 737{ 738 struct inode *inode = sb_dqopt(sb)->files[type]; 739 sector_t blk = off >> sb->s_blocksize_bits; 740 int err = 0; 741 int offset = off & (sb->s_blocksize - 1); 742 int tocopy; 743 size_t toread; 744 struct buffer_head tmp_bh; 745 struct buffer_head *bh; 746 loff_t i_size = i_size_read(inode); 747 748 if (off > i_size) 749 return 0; 750 if (off+len > i_size) 751 len = i_size-off; 752 toread = len; 753 while (toread > 0) { 754 tocopy = sb->s_blocksize - offset < toread ? 755 sb->s_blocksize - offset : toread; 756 757 tmp_bh.b_state = 0; 758 tmp_bh.b_size = i_blocksize(inode); 759 err = jfs_get_block(inode, blk, &tmp_bh, 0); 760 if (err) 761 return err; 762 if (!buffer_mapped(&tmp_bh)) /* A hole? */ 763 memset(data, 0, tocopy); 764 else { 765 bh = sb_bread(sb, tmp_bh.b_blocknr); 766 if (!bh) 767 return -EIO; 768 memcpy(data, bh->b_data+offset, tocopy); 769 brelse(bh); 770 } 771 offset = 0; 772 toread -= tocopy; 773 data += tocopy; 774 blk++; 775 } 776 return len; 777} 778 779/* Write to quotafile */ 780static ssize_t jfs_quota_write(struct super_block *sb, int type, 781 const char *data, size_t len, loff_t off) 782{ 783 struct inode *inode = sb_dqopt(sb)->files[type]; 784 sector_t blk = off >> sb->s_blocksize_bits; 785 int err = 0; 786 int offset = off & (sb->s_blocksize - 1); 787 int tocopy; 788 size_t towrite = len; 789 struct buffer_head tmp_bh; 790 struct buffer_head *bh; 791 792 inode_lock(inode); 793 while (towrite > 0) { 794 tocopy = sb->s_blocksize - offset < towrite ? 795 sb->s_blocksize - offset : towrite; 796 797 tmp_bh.b_state = 0; 798 tmp_bh.b_size = i_blocksize(inode); 799 err = jfs_get_block(inode, blk, &tmp_bh, 1); 800 if (err) 801 goto out; 802 if (offset || tocopy != sb->s_blocksize) 803 bh = sb_bread(sb, tmp_bh.b_blocknr); 804 else 805 bh = sb_getblk(sb, tmp_bh.b_blocknr); 806 if (!bh) { 807 err = -EIO; 808 goto out; 809 } 810 lock_buffer(bh); 811 memcpy(bh->b_data+offset, data, tocopy); 812 flush_dcache_page(bh->b_page); 813 set_buffer_uptodate(bh); 814 mark_buffer_dirty(bh); 815 unlock_buffer(bh); 816 brelse(bh); 817 offset = 0; 818 towrite -= tocopy; 819 data += tocopy; 820 blk++; 821 } 822out: 823 if (len == towrite) { 824 inode_unlock(inode); 825 return err; 826 } 827 if (inode->i_size < off+len-towrite) 828 i_size_write(inode, off+len-towrite); 829 inode->i_mtime = inode->i_ctime = current_time(inode); 830 mark_inode_dirty(inode); 831 inode_unlock(inode); 832 return len - towrite; 833} 834 835static struct dquot **jfs_get_dquots(struct inode *inode) 836{ 837 return JFS_IP(inode)->i_dquot; 838} 839 840static int jfs_quota_on(struct super_block *sb, int type, int format_id, 841 const struct path *path) 842{ 843 int err; 844 struct inode *inode; 845 846 err = dquot_quota_on(sb, type, format_id, path); 847 if (err) 848 return err; 849 850 inode = d_inode(path->dentry); 851 inode_lock(inode); 852 JFS_IP(inode)->mode2 |= JFS_NOATIME_FL | JFS_IMMUTABLE_FL; 853 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE, 854 S_NOATIME | S_IMMUTABLE); 855 inode_unlock(inode); 856 mark_inode_dirty(inode); 857 858 return 0; 859} 860 861static int jfs_quota_off(struct super_block *sb, int type) 862{ 863 struct inode *inode = sb_dqopt(sb)->files[type]; 864 int err; 865 866 if (!inode || !igrab(inode)) 867 goto out; 868 869 err = dquot_quota_off(sb, type); 870 if (err) 871 goto out_put; 872 873 inode_lock(inode); 874 JFS_IP(inode)->mode2 &= ~(JFS_NOATIME_FL | JFS_IMMUTABLE_FL); 875 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE); 876 inode_unlock(inode); 877 mark_inode_dirty(inode); 878out_put: 879 iput(inode); 880 return err; 881out: 882 return dquot_quota_off(sb, type); 883} 884#endif 885 886static const struct super_operations jfs_super_operations = { 887 .alloc_inode = jfs_alloc_inode, 888 .free_inode = jfs_free_inode, 889 .dirty_inode = jfs_dirty_inode, 890 .write_inode = jfs_write_inode, 891 .evict_inode = jfs_evict_inode, 892 .put_super = jfs_put_super, 893 .sync_fs = jfs_sync_fs, 894 .freeze_fs = jfs_freeze, 895 .unfreeze_fs = jfs_unfreeze, 896 .statfs = jfs_statfs, 897 .remount_fs = jfs_remount, 898 .show_options = jfs_show_options, 899#ifdef CONFIG_QUOTA 900 .quota_read = jfs_quota_read, 901 .quota_write = jfs_quota_write, 902 .get_dquots = jfs_get_dquots, 903#endif 904}; 905 906static const struct export_operations jfs_export_operations = { 907 .fh_to_dentry = jfs_fh_to_dentry, 908 .fh_to_parent = jfs_fh_to_parent, 909 .get_parent = jfs_get_parent, 910}; 911 912static struct file_system_type jfs_fs_type = { 913 .owner = THIS_MODULE, 914 .name = "jfs", 915 .mount = jfs_do_mount, 916 .kill_sb = kill_block_super, 917 .fs_flags = FS_REQUIRES_DEV, 918}; 919MODULE_ALIAS_FS("jfs"); 920 921static void init_once(void *foo) 922{ 923 struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo; 924 925 memset(jfs_ip, 0, sizeof(struct jfs_inode_info)); 926 INIT_LIST_HEAD(&jfs_ip->anon_inode_list); 927 init_rwsem(&jfs_ip->rdwrlock); 928 mutex_init(&jfs_ip->commit_mutex); 929 init_rwsem(&jfs_ip->xattr_sem); 930 spin_lock_init(&jfs_ip->ag_lock); 931 jfs_ip->active_ag = -1; 932 inode_init_once(&jfs_ip->vfs_inode); 933} 934 935static int __init init_jfs_fs(void) 936{ 937 int i; 938 int rc; 939 940 jfs_inode_cachep = 941 kmem_cache_create_usercopy("jfs_ip", sizeof(struct jfs_inode_info), 942 0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|SLAB_ACCOUNT, 943 offsetof(struct jfs_inode_info, i_inline), IDATASIZE, 944 init_once); 945 if (jfs_inode_cachep == NULL) 946 return -ENOMEM; 947 948 /* 949 * Metapage initialization 950 */ 951 rc = metapage_init(); 952 if (rc) { 953 jfs_err("metapage_init failed w/rc = %d", rc); 954 goto free_slab; 955 } 956 957 /* 958 * Transaction Manager initialization 959 */ 960 rc = txInit(); 961 if (rc) { 962 jfs_err("txInit failed w/rc = %d", rc); 963 goto free_metapage; 964 } 965 966 /* 967 * I/O completion thread (endio) 968 */ 969 jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO"); 970 if (IS_ERR(jfsIOthread)) { 971 rc = PTR_ERR(jfsIOthread); 972 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 973 goto end_txmngr; 974 } 975 976 if (commit_threads < 1) 977 commit_threads = num_online_cpus(); 978 if (commit_threads > MAX_COMMIT_THREADS) 979 commit_threads = MAX_COMMIT_THREADS; 980 981 for (i = 0; i < commit_threads; i++) { 982 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, 983 "jfsCommit"); 984 if (IS_ERR(jfsCommitThread[i])) { 985 rc = PTR_ERR(jfsCommitThread[i]); 986 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 987 commit_threads = i; 988 goto kill_committask; 989 } 990 } 991 992 jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync"); 993 if (IS_ERR(jfsSyncThread)) { 994 rc = PTR_ERR(jfsSyncThread); 995 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 996 goto kill_committask; 997 } 998 999#ifdef PROC_FS_JFS 1000 jfs_proc_init(); 1001#endif 1002 1003 rc = register_filesystem(&jfs_fs_type); 1004 if (!rc) 1005 return 0; 1006 1007#ifdef PROC_FS_JFS 1008 jfs_proc_clean(); 1009#endif 1010 kthread_stop(jfsSyncThread); 1011kill_committask: 1012 for (i = 0; i < commit_threads; i++) 1013 kthread_stop(jfsCommitThread[i]); 1014 kthread_stop(jfsIOthread); 1015end_txmngr: 1016 txExit(); 1017free_metapage: 1018 metapage_exit(); 1019free_slab: 1020 kmem_cache_destroy(jfs_inode_cachep); 1021 return rc; 1022} 1023 1024static void __exit exit_jfs_fs(void) 1025{ 1026 int i; 1027 1028 jfs_info("exit_jfs_fs called"); 1029 1030 txExit(); 1031 metapage_exit(); 1032 1033 kthread_stop(jfsIOthread); 1034 for (i = 0; i < commit_threads; i++) 1035 kthread_stop(jfsCommitThread[i]); 1036 kthread_stop(jfsSyncThread); 1037#ifdef PROC_FS_JFS 1038 jfs_proc_clean(); 1039#endif 1040 unregister_filesystem(&jfs_fs_type); 1041 1042 /* 1043 * Make sure all delayed rcu free inodes are flushed before we 1044 * destroy cache. 1045 */ 1046 rcu_barrier(); 1047 kmem_cache_destroy(jfs_inode_cachep); 1048} 1049 1050module_init(init_jfs_fs) 1051module_exit(exit_jfs_fs) 1052