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/completion.h> 10 #include <linux/vfs.h> 11 #include <linux/quotaops.h> 12 #include <linux/fs_context.h> 13 #include <linux/fs_parser.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 37 MODULE_DESCRIPTION("The Journaled Filesystem (JFS)"); 38 MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM"); 39 MODULE_LICENSE("GPL"); 40 41 static struct kmem_cache *jfs_inode_cachep; 42 43 static const struct super_operations jfs_super_operations; 44 static const struct export_operations jfs_export_operations; 45 static struct file_system_type jfs_fs_type; 46 47 #define MAX_COMMIT_THREADS 64 48 static int commit_threads; 49 module_param(commit_threads, int, 0); 50 MODULE_PARM_DESC(commit_threads, "Number of commit threads"); 51 52 static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS]; 53 struct task_struct *jfsIOthread; 54 struct task_struct *jfsSyncThread; 55 56 #ifdef CONFIG_JFS_DEBUG 57 int jfsloglevel = JFS_LOGLEVEL_WARN; 58 module_param(jfsloglevel, int, 0644); 59 MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)"); 60 #endif 61 62 static 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 83 void 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 } 100 101 static struct inode *jfs_alloc_inode(struct super_block *sb) 102 { 103 struct jfs_inode_info *jfs_inode; 104 105 jfs_inode = alloc_inode_sb(sb, 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 } 113 114 static void jfs_free_inode(struct inode *inode) 115 { 116 kmem_cache_free(jfs_inode_cachep, JFS_IP(inode)); 117 } 118 119 static 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 157 static int jfs_quota_off(struct super_block *sb, int type); 158 static int jfs_quota_on(struct super_block *sb, int type, int format_id, 159 const struct path *path); 160 161 static 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 } 168 169 static 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 180 static inline void jfs_quota_off_umount(struct super_block *sb) 181 { 182 } 183 #endif 184 185 static 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 } 205 206 enum { 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 }; 212 213 static const struct constant_table jfs_param_errors[] = { 214 {"continue", JFS_ERR_CONTINUE}, 215 {"remount-ro", JFS_ERR_REMOUNT_RO}, 216 {"panic", JFS_ERR_PANIC}, 217 {} 218 }; 219 220 static const struct fs_parameter_spec jfs_param_spec[] = { 221 fsparam_flag_no ("integrity", Opt_integrity), 222 fsparam_string ("iocharset", Opt_iocharset), 223 fsparam_u64 ("resize", Opt_resize), 224 fsparam_flag ("resize", Opt_resize_nosize), 225 fsparam_enum ("errors", Opt_errors, jfs_param_errors), 226 fsparam_flag ("quota", Opt_quota), 227 fsparam_flag ("noquota", Opt_ignore), 228 fsparam_flag ("usrquota", Opt_usrquota), 229 fsparam_flag ("grpquota", Opt_grpquota), 230 fsparam_uid ("uid", Opt_uid), 231 fsparam_gid ("gid", Opt_gid), 232 fsparam_u32oct ("umask", Opt_umask), 233 fsparam_flag ("discard", Opt_discard), 234 fsparam_u32 ("discard", Opt_discard_minblk), 235 fsparam_flag ("nodiscard", Opt_nodiscard), 236 {} 237 }; 238 239 struct jfs_context { 240 int flag; 241 kuid_t uid; 242 kgid_t gid; 243 uint umask; 244 uint minblks_trim; 245 void *nls_map; 246 bool resize; 247 s64 newLVSize; 248 }; 249 250 static int jfs_parse_param(struct fs_context *fc, struct fs_parameter *param) 251 { 252 struct jfs_context *ctx = fc->fs_private; 253 int reconfigure = (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE); 254 struct fs_parse_result result; 255 struct nls_table *nls_map; 256 int opt; 257 258 opt = fs_parse(fc, jfs_param_spec, param, &result); 259 if (opt < 0) 260 return opt; 261 262 switch (opt) { 263 case Opt_integrity: 264 if (result.negated) 265 ctx->flag |= JFS_NOINTEGRITY; 266 else 267 ctx->flag &= ~JFS_NOINTEGRITY; 268 break; 269 case Opt_ignore: 270 /* Silently ignore the quota options */ 271 /* Don't do anything ;-) */ 272 break; 273 case Opt_iocharset: 274 if (ctx->nls_map && ctx->nls_map != (void *) -1) { 275 unload_nls(ctx->nls_map); 276 ctx->nls_map = NULL; 277 } 278 if (!strcmp(param->string, "none")) 279 ctx->nls_map = NULL; 280 else { 281 nls_map = load_nls(param->string); 282 if (!nls_map) { 283 pr_err("JFS: charset not found\n"); 284 return -EINVAL; 285 } 286 ctx->nls_map = nls_map; 287 } 288 break; 289 case Opt_resize: 290 if (!reconfigure) 291 return -EINVAL; 292 ctx->resize = true; 293 ctx->newLVSize = result.uint_64; 294 break; 295 case Opt_resize_nosize: 296 if (!reconfigure) 297 return -EINVAL; 298 ctx->resize = true; 299 break; 300 case Opt_errors: 301 ctx->flag &= ~JFS_ERR_MASK; 302 ctx->flag |= result.uint_32; 303 break; 304 305 #ifdef CONFIG_QUOTA 306 case Opt_quota: 307 case Opt_usrquota: 308 ctx->flag |= JFS_USRQUOTA; 309 break; 310 case Opt_grpquota: 311 ctx->flag |= JFS_GRPQUOTA; 312 break; 313 #else 314 case Opt_usrquota: 315 case Opt_grpquota: 316 case Opt_quota: 317 pr_err("JFS: quota operations not supported\n"); 318 break; 319 #endif 320 case Opt_uid: 321 ctx->uid = result.uid; 322 break; 323 324 case Opt_gid: 325 ctx->gid = result.gid; 326 break; 327 328 case Opt_umask: 329 if (result.uint_32 & ~0777) { 330 pr_err("JFS: Invalid value of umask\n"); 331 return -EINVAL; 332 } 333 ctx->umask = result.uint_32; 334 break; 335 336 case Opt_discard: 337 /* if set to 1, even copying files will cause 338 * trimming :O 339 * -> user has more control over the online trimming 340 */ 341 ctx->minblks_trim = 64; 342 ctx->flag |= JFS_DISCARD; 343 break; 344 345 case Opt_nodiscard: 346 ctx->flag &= ~JFS_DISCARD; 347 break; 348 349 case Opt_discard_minblk: 350 ctx->minblks_trim = result.uint_32; 351 ctx->flag |= JFS_DISCARD; 352 break; 353 354 default: 355 return -EINVAL; 356 } 357 358 return 0; 359 } 360 361 static int jfs_reconfigure(struct fs_context *fc) 362 { 363 struct jfs_context *ctx = fc->fs_private; 364 struct super_block *sb = fc->root->d_sb; 365 int readonly = fc->sb_flags & SB_RDONLY; 366 int rc = 0; 367 int flag = ctx->flag; 368 int ret; 369 370 sync_filesystem(sb); 371 372 /* Transfer results of parsing to the sbi */ 373 JFS_SBI(sb)->flag = ctx->flag; 374 JFS_SBI(sb)->uid = ctx->uid; 375 JFS_SBI(sb)->gid = ctx->gid; 376 JFS_SBI(sb)->umask = ctx->umask; 377 JFS_SBI(sb)->minblks_trim = ctx->minblks_trim; 378 if (ctx->nls_map != (void *) -1) { 379 unload_nls(JFS_SBI(sb)->nls_tab); 380 JFS_SBI(sb)->nls_tab = ctx->nls_map; 381 } 382 ctx->nls_map = NULL; 383 384 if (ctx->resize) { 385 if (sb_rdonly(sb)) { 386 pr_err("JFS: resize requires volume to be mounted read-write\n"); 387 return -EROFS; 388 } 389 390 if (!ctx->newLVSize) { 391 ctx->newLVSize = sb_bdev_nr_blocks(sb); 392 if (ctx->newLVSize == 0) 393 pr_err("JFS: Cannot determine volume size\n"); 394 } 395 396 rc = jfs_extendfs(sb, ctx->newLVSize, 0); 397 if (rc) 398 return rc; 399 } 400 401 if (sb_rdonly(sb) && !readonly) { 402 /* 403 * Invalidate any previously read metadata. fsck may have 404 * changed the on-disk data since we mounted r/o 405 */ 406 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0); 407 408 JFS_SBI(sb)->flag = flag; 409 ret = jfs_mount_rw(sb, 1); 410 411 /* mark the fs r/w for quota activity */ 412 sb->s_flags &= ~SB_RDONLY; 413 414 dquot_resume(sb, -1); 415 return ret; 416 } 417 if (!sb_rdonly(sb) && readonly) { 418 rc = dquot_suspend(sb, -1); 419 if (rc < 0) 420 return rc; 421 rc = jfs_umount_rw(sb); 422 JFS_SBI(sb)->flag = flag; 423 return rc; 424 } 425 if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY)) { 426 if (!sb_rdonly(sb)) { 427 rc = jfs_umount_rw(sb); 428 if (rc) 429 return rc; 430 431 JFS_SBI(sb)->flag = flag; 432 ret = jfs_mount_rw(sb, 1); 433 return ret; 434 } 435 } 436 JFS_SBI(sb)->flag = flag; 437 438 return 0; 439 } 440 441 static int jfs_fill_super(struct super_block *sb, struct fs_context *fc) 442 { 443 struct jfs_context *ctx = fc->fs_private; 444 int silent = fc->sb_flags & SB_SILENT; 445 struct jfs_sb_info *sbi; 446 struct inode *inode; 447 int rc; 448 int ret = -EINVAL; 449 450 jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags); 451 452 sbi = kzalloc_obj(struct jfs_sb_info); 453 if (!sbi) 454 return -ENOMEM; 455 456 sb->s_fs_info = sbi; 457 sb->s_max_links = JFS_LINK_MAX; 458 sb->s_time_min = 0; 459 sb->s_time_max = U32_MAX; 460 sbi->sb = sb; 461 462 /* Transfer results of parsing to the sbi */ 463 sbi->flag = ctx->flag; 464 sbi->uid = ctx->uid; 465 sbi->gid = ctx->gid; 466 sbi->umask = ctx->umask; 467 if (ctx->nls_map != (void *) -1) { 468 unload_nls(sbi->nls_tab); 469 sbi->nls_tab = ctx->nls_map; 470 } 471 ctx->nls_map = NULL; 472 473 if (sbi->flag & JFS_DISCARD) { 474 if (!bdev_max_discard_sectors(sb->s_bdev)) { 475 pr_err("JFS: discard option not supported on device\n"); 476 sbi->flag &= ~JFS_DISCARD; 477 } else { 478 sbi->minblks_trim = ctx->minblks_trim; 479 } 480 } 481 482 #ifdef CONFIG_JFS_POSIX_ACL 483 sb->s_flags |= SB_POSIXACL; 484 #endif 485 486 if (ctx->resize) { 487 pr_err("resize option for remount only\n"); 488 goto out_unload; 489 } 490 491 /* 492 * Initialize blocksize to 4K. 493 */ 494 if (!sb_set_blocksize(sb, PSIZE)) 495 goto out_unload; 496 497 /* 498 * Set method vectors. 499 */ 500 sb->s_op = &jfs_super_operations; 501 sb->s_export_op = &jfs_export_operations; 502 sb->s_xattr = jfs_xattr_handlers; 503 #ifdef CONFIG_QUOTA 504 sb->dq_op = &dquot_operations; 505 sb->s_qcop = &jfs_quotactl_ops; 506 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; 507 #endif 508 509 /* 510 * Initialize direct-mapping inode/address-space 511 */ 512 inode = new_inode(sb); 513 if (inode == NULL) { 514 ret = -ENOMEM; 515 goto out_unload; 516 } 517 inode->i_size = bdev_nr_bytes(sb->s_bdev); 518 inode->i_mapping->a_ops = &jfs_metapage_aops; 519 inode_fake_hash(inode); 520 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS); 521 522 sbi->direct_inode = inode; 523 524 rc = jfs_mount(sb); 525 if (rc) { 526 if (!silent) 527 jfs_err("jfs_mount failed w/return code = %d", rc); 528 goto out_mount_failed; 529 } 530 if (sb_rdonly(sb)) 531 sbi->log = NULL; 532 else { 533 rc = jfs_mount_rw(sb, 0); 534 if (rc) { 535 if (!silent) { 536 jfs_err("jfs_mount_rw failed, return code = %d", 537 rc); 538 } 539 goto out_no_rw; 540 } 541 } 542 543 sb->s_magic = JFS_SUPER_MAGIC; 544 545 if (sbi->mntflag & JFS_OS2) 546 set_default_d_op(sb, &jfs_ci_dentry_operations); 547 548 inode = jfs_iget(sb, ROOT_I); 549 if (IS_ERR(inode)) { 550 ret = PTR_ERR(inode); 551 goto out_no_rw; 552 } 553 sb->s_root = d_make_root(inode); 554 if (!sb->s_root) 555 goto out_no_root; 556 557 /* logical blocks are represented by 40 bits in pxd_t, etc. 558 * and page cache is indexed by long 559 */ 560 sb->s_maxbytes = min(((loff_t)sb->s_blocksize) << 40, MAX_LFS_FILESIZE); 561 sb->s_time_gran = 1; 562 return 0; 563 564 out_no_root: 565 jfs_err("jfs_read_super: get root dentry failed"); 566 567 out_no_rw: 568 rc = jfs_umount(sb); 569 if (rc) 570 jfs_err("jfs_umount failed with return code %d", rc); 571 out_mount_failed: 572 filemap_write_and_wait(sbi->direct_inode->i_mapping); 573 truncate_inode_pages(sbi->direct_inode->i_mapping, 0); 574 make_bad_inode(sbi->direct_inode); 575 iput(sbi->direct_inode); 576 sbi->direct_inode = NULL; 577 out_unload: 578 unload_nls(sbi->nls_tab); 579 kfree(sbi); 580 return ret; 581 } 582 583 static int jfs_freeze(struct super_block *sb) 584 { 585 struct jfs_sb_info *sbi = JFS_SBI(sb); 586 struct jfs_log *log = sbi->log; 587 int rc = 0; 588 589 if (!sb_rdonly(sb)) { 590 txQuiesce(sb); 591 rc = lmLogShutdown(log); 592 if (rc) { 593 jfs_error(sb, "lmLogShutdown failed\n"); 594 595 /* let operations fail rather than hang */ 596 txResume(sb); 597 598 return rc; 599 } 600 rc = updateSuper(sb, FM_CLEAN); 601 if (rc) { 602 jfs_err("jfs_freeze: updateSuper failed"); 603 /* 604 * Don't fail here. Everything succeeded except 605 * marking the superblock clean, so there's really 606 * no harm in leaving it frozen for now. 607 */ 608 } 609 } 610 return 0; 611 } 612 613 static int jfs_unfreeze(struct super_block *sb) 614 { 615 struct jfs_sb_info *sbi = JFS_SBI(sb); 616 struct jfs_log *log = sbi->log; 617 int rc = 0; 618 619 if (!sb_rdonly(sb)) { 620 rc = updateSuper(sb, FM_MOUNT); 621 if (rc) { 622 jfs_error(sb, "updateSuper failed\n"); 623 goto out; 624 } 625 rc = lmLogInit(log); 626 if (rc) 627 jfs_error(sb, "lmLogInit failed\n"); 628 out: 629 txResume(sb); 630 } 631 return rc; 632 } 633 634 static int jfs_get_tree(struct fs_context *fc) 635 { 636 return get_tree_bdev(fc, jfs_fill_super); 637 } 638 639 static int jfs_sync_fs(struct super_block *sb, int wait) 640 { 641 struct jfs_log *log = JFS_SBI(sb)->log; 642 643 /* log == NULL indicates read-only mount */ 644 if (log) { 645 /* 646 * Write quota structures to quota file, sync_blockdev() will 647 * write them to disk later 648 */ 649 dquot_writeback_dquots(sb, -1); 650 jfs_flush_journal(log, wait); 651 jfs_syncpt(log, 0); 652 } 653 654 return 0; 655 } 656 657 static int jfs_show_options(struct seq_file *seq, struct dentry *root) 658 { 659 struct jfs_sb_info *sbi = JFS_SBI(root->d_sb); 660 661 if (uid_valid(sbi->uid)) 662 seq_printf(seq, ",uid=%d", from_kuid(&init_user_ns, sbi->uid)); 663 if (gid_valid(sbi->gid)) 664 seq_printf(seq, ",gid=%d", from_kgid(&init_user_ns, sbi->gid)); 665 if (sbi->umask != -1) 666 seq_printf(seq, ",umask=%03o", sbi->umask); 667 if (sbi->flag & JFS_NOINTEGRITY) 668 seq_puts(seq, ",nointegrity"); 669 if (sbi->flag & JFS_DISCARD) 670 seq_printf(seq, ",discard=%u", sbi->minblks_trim); 671 if (sbi->nls_tab) 672 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset); 673 if (sbi->flag & JFS_ERR_CONTINUE) 674 seq_printf(seq, ",errors=continue"); 675 if (sbi->flag & JFS_ERR_PANIC) 676 seq_printf(seq, ",errors=panic"); 677 678 #ifdef CONFIG_QUOTA 679 if (sbi->flag & JFS_USRQUOTA) 680 seq_puts(seq, ",usrquota"); 681 682 if (sbi->flag & JFS_GRPQUOTA) 683 seq_puts(seq, ",grpquota"); 684 #endif 685 686 return 0; 687 } 688 689 #ifdef CONFIG_QUOTA 690 691 /* Read data from quotafile - avoid pagecache and such because we cannot afford 692 * acquiring the locks... As quota files are never truncated and quota code 693 * itself serializes the operations (and no one else should touch the files) 694 * we don't have to be afraid of races */ 695 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data, 696 size_t len, loff_t off) 697 { 698 struct inode *inode = sb_dqopt(sb)->files[type]; 699 sector_t blk = off >> sb->s_blocksize_bits; 700 int err = 0; 701 int offset = off & (sb->s_blocksize - 1); 702 int tocopy; 703 size_t toread; 704 struct buffer_head tmp_bh; 705 struct buffer_head *bh; 706 loff_t i_size = i_size_read(inode); 707 708 if (off > i_size) 709 return 0; 710 if (off+len > i_size) 711 len = i_size-off; 712 toread = len; 713 while (toread > 0) { 714 tocopy = min_t(size_t, sb->s_blocksize - offset, toread); 715 716 tmp_bh.b_state = 0; 717 tmp_bh.b_size = i_blocksize(inode); 718 err = jfs_get_block(inode, blk, &tmp_bh, 0); 719 if (err) 720 return err; 721 if (!buffer_mapped(&tmp_bh)) /* A hole? */ 722 memset(data, 0, tocopy); 723 else { 724 bh = sb_bread(sb, tmp_bh.b_blocknr); 725 if (!bh) 726 return -EIO; 727 memcpy(data, bh->b_data+offset, tocopy); 728 brelse(bh); 729 } 730 offset = 0; 731 toread -= tocopy; 732 data += tocopy; 733 blk++; 734 } 735 return len; 736 } 737 738 /* Write to quotafile */ 739 static ssize_t jfs_quota_write(struct super_block *sb, int type, 740 const char *data, size_t len, loff_t off) 741 { 742 struct inode *inode = sb_dqopt(sb)->files[type]; 743 sector_t blk = off >> sb->s_blocksize_bits; 744 int err = 0; 745 int offset = off & (sb->s_blocksize - 1); 746 int tocopy; 747 size_t towrite = len; 748 struct buffer_head tmp_bh; 749 struct buffer_head *bh; 750 751 inode_lock(inode); 752 while (towrite > 0) { 753 tocopy = min_t(size_t, sb->s_blocksize - offset, towrite); 754 755 tmp_bh.b_state = 0; 756 tmp_bh.b_size = i_blocksize(inode); 757 err = jfs_get_block(inode, blk, &tmp_bh, 1); 758 if (err) 759 goto out; 760 if (offset || tocopy != sb->s_blocksize) 761 bh = sb_bread(sb, tmp_bh.b_blocknr); 762 else 763 bh = sb_getblk(sb, tmp_bh.b_blocknr); 764 if (!bh) { 765 err = -EIO; 766 goto out; 767 } 768 lock_buffer(bh); 769 memcpy(bh->b_data+offset, data, tocopy); 770 flush_dcache_folio(bh->b_folio); 771 set_buffer_uptodate(bh); 772 mark_buffer_dirty(bh); 773 unlock_buffer(bh); 774 brelse(bh); 775 offset = 0; 776 towrite -= tocopy; 777 data += tocopy; 778 blk++; 779 } 780 out: 781 if (len == towrite) { 782 inode_unlock(inode); 783 return err; 784 } 785 if (inode->i_size < off+len-towrite) 786 i_size_write(inode, off+len-towrite); 787 inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode)); 788 mark_inode_dirty(inode); 789 inode_unlock(inode); 790 return len - towrite; 791 } 792 793 static struct dquot __rcu **jfs_get_dquots(struct inode *inode) 794 { 795 return JFS_IP(inode)->i_dquot; 796 } 797 798 static int jfs_quota_on(struct super_block *sb, int type, int format_id, 799 const struct path *path) 800 { 801 int err; 802 struct inode *inode; 803 804 err = dquot_quota_on(sb, type, format_id, path); 805 if (err) 806 return err; 807 808 inode = d_inode(path->dentry); 809 inode_lock(inode); 810 JFS_IP(inode)->mode2 |= JFS_NOATIME_FL | JFS_IMMUTABLE_FL; 811 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE, 812 S_NOATIME | S_IMMUTABLE); 813 inode_unlock(inode); 814 mark_inode_dirty(inode); 815 816 return 0; 817 } 818 819 static int jfs_quota_off(struct super_block *sb, int type) 820 { 821 struct inode *inode = sb_dqopt(sb)->files[type]; 822 int err; 823 824 if (!inode || !igrab(inode)) 825 goto out; 826 827 err = dquot_quota_off(sb, type); 828 if (err) 829 goto out_put; 830 831 inode_lock(inode); 832 JFS_IP(inode)->mode2 &= ~(JFS_NOATIME_FL | JFS_IMMUTABLE_FL); 833 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE); 834 inode_unlock(inode); 835 mark_inode_dirty(inode); 836 out_put: 837 iput(inode); 838 return err; 839 out: 840 return dquot_quota_off(sb, type); 841 } 842 #endif 843 844 static const struct super_operations jfs_super_operations = { 845 .alloc_inode = jfs_alloc_inode, 846 .free_inode = jfs_free_inode, 847 .dirty_inode = jfs_dirty_inode, 848 .write_inode = jfs_write_inode, 849 .evict_inode = jfs_evict_inode, 850 .put_super = jfs_put_super, 851 .sync_fs = jfs_sync_fs, 852 .freeze_fs = jfs_freeze, 853 .unfreeze_fs = jfs_unfreeze, 854 .statfs = jfs_statfs, 855 .show_options = jfs_show_options, 856 #ifdef CONFIG_QUOTA 857 .quota_read = jfs_quota_read, 858 .quota_write = jfs_quota_write, 859 .get_dquots = jfs_get_dquots, 860 #endif 861 }; 862 863 static const struct export_operations jfs_export_operations = { 864 .encode_fh = generic_encode_ino32_fh, 865 .fh_to_dentry = jfs_fh_to_dentry, 866 .fh_to_parent = jfs_fh_to_parent, 867 .get_parent = jfs_get_parent, 868 }; 869 870 static void jfs_init_options(struct fs_context *fc, struct jfs_context *ctx) 871 { 872 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) { 873 struct super_block *sb = fc->root->d_sb; 874 875 /* Copy over current option values and mount flags */ 876 ctx->uid = JFS_SBI(sb)->uid; 877 ctx->gid = JFS_SBI(sb)->gid; 878 ctx->umask = JFS_SBI(sb)->umask; 879 ctx->nls_map = (void *)-1; 880 ctx->minblks_trim = JFS_SBI(sb)->minblks_trim; 881 ctx->flag = JFS_SBI(sb)->flag; 882 883 } else { 884 /* 885 * Initialize the mount flag and determine the default 886 * error handler 887 */ 888 ctx->flag = JFS_ERR_REMOUNT_RO; 889 ctx->uid = INVALID_UID; 890 ctx->gid = INVALID_GID; 891 ctx->umask = -1; 892 ctx->nls_map = (void *)-1; 893 } 894 } 895 896 static void jfs_free_fc(struct fs_context *fc) 897 { 898 struct jfs_context *ctx = fc->fs_private; 899 900 if (ctx->nls_map != (void *) -1) 901 unload_nls(ctx->nls_map); 902 kfree(ctx); 903 } 904 905 static const struct fs_context_operations jfs_context_ops = { 906 .parse_param = jfs_parse_param, 907 .get_tree = jfs_get_tree, 908 .reconfigure = jfs_reconfigure, 909 .free = jfs_free_fc, 910 }; 911 912 static int jfs_init_fs_context(struct fs_context *fc) 913 { 914 struct jfs_context *ctx; 915 916 ctx = kzalloc_obj(*ctx); 917 if (!ctx) 918 return -ENOMEM; 919 920 jfs_init_options(fc, ctx); 921 922 fc->fs_private = ctx; 923 fc->ops = &jfs_context_ops; 924 925 return 0; 926 } 927 928 static struct file_system_type jfs_fs_type = { 929 .owner = THIS_MODULE, 930 .name = "jfs", 931 .kill_sb = kill_block_super, 932 .fs_flags = FS_REQUIRES_DEV, 933 .init_fs_context = jfs_init_fs_context, 934 .parameters = jfs_param_spec, 935 }; 936 MODULE_ALIAS_FS("jfs"); 937 938 static void init_once(void *foo) 939 { 940 struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo; 941 942 memset(jfs_ip, 0, sizeof(struct jfs_inode_info)); 943 INIT_LIST_HEAD(&jfs_ip->anon_inode_list); 944 init_rwsem(&jfs_ip->rdwrlock); 945 mutex_init(&jfs_ip->commit_mutex); 946 init_rwsem(&jfs_ip->xattr_sem); 947 spin_lock_init(&jfs_ip->ag_lock); 948 jfs_ip->active_ag = -1; 949 inode_init_once(&jfs_ip->vfs_inode); 950 } 951 952 static int __init init_jfs_fs(void) 953 { 954 int i; 955 int rc; 956 957 jfs_inode_cachep = 958 kmem_cache_create_usercopy("jfs_ip", sizeof(struct jfs_inode_info), 959 0, SLAB_RECLAIM_ACCOUNT|SLAB_ACCOUNT, 960 offsetof(struct jfs_inode_info, i_inline_all), 961 sizeof_field(struct jfs_inode_info, i_inline_all), 962 init_once); 963 if (jfs_inode_cachep == NULL) 964 return -ENOMEM; 965 966 /* 967 * Metapage initialization 968 */ 969 rc = metapage_init(); 970 if (rc) { 971 jfs_err("metapage_init failed w/rc = %d", rc); 972 goto free_slab; 973 } 974 975 /* 976 * Transaction Manager initialization 977 */ 978 rc = txInit(); 979 if (rc) { 980 jfs_err("txInit failed w/rc = %d", rc); 981 goto free_metapage; 982 } 983 984 /* 985 * I/O completion thread (endio) 986 */ 987 jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO"); 988 if (IS_ERR(jfsIOthread)) { 989 rc = PTR_ERR(jfsIOthread); 990 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 991 goto end_txmngr; 992 } 993 994 if (commit_threads < 1) 995 commit_threads = num_online_cpus(); 996 if (commit_threads > MAX_COMMIT_THREADS) 997 commit_threads = MAX_COMMIT_THREADS; 998 999 for (i = 0; i < commit_threads; i++) { 1000 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, 1001 "jfsCommit"); 1002 if (IS_ERR(jfsCommitThread[i])) { 1003 rc = PTR_ERR(jfsCommitThread[i]); 1004 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 1005 commit_threads = i; 1006 goto kill_committask; 1007 } 1008 } 1009 1010 jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync"); 1011 if (IS_ERR(jfsSyncThread)) { 1012 rc = PTR_ERR(jfsSyncThread); 1013 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); 1014 goto kill_committask; 1015 } 1016 1017 #ifdef PROC_FS_JFS 1018 jfs_proc_init(); 1019 #endif 1020 1021 rc = register_filesystem(&jfs_fs_type); 1022 if (!rc) 1023 return 0; 1024 1025 #ifdef PROC_FS_JFS 1026 jfs_proc_clean(); 1027 #endif 1028 kthread_stop(jfsSyncThread); 1029 kill_committask: 1030 for (i = 0; i < commit_threads; i++) 1031 kthread_stop(jfsCommitThread[i]); 1032 kthread_stop(jfsIOthread); 1033 end_txmngr: 1034 txExit(); 1035 free_metapage: 1036 metapage_exit(); 1037 free_slab: 1038 kmem_cache_destroy(jfs_inode_cachep); 1039 return rc; 1040 } 1041 1042 static void __exit exit_jfs_fs(void) 1043 { 1044 int i; 1045 1046 jfs_info("exit_jfs_fs called"); 1047 1048 txExit(); 1049 metapage_exit(); 1050 1051 kthread_stop(jfsIOthread); 1052 for (i = 0; i < commit_threads; i++) 1053 kthread_stop(jfsCommitThread[i]); 1054 kthread_stop(jfsSyncThread); 1055 #ifdef PROC_FS_JFS 1056 jfs_proc_clean(); 1057 #endif 1058 unregister_filesystem(&jfs_fs_type); 1059 1060 /* 1061 * Make sure all delayed rcu free inodes are flushed before we 1062 * destroy cache. 1063 */ 1064 rcu_barrier(); 1065 kmem_cache_destroy(jfs_inode_cachep); 1066 } 1067 1068 module_init(init_jfs_fs) 1069 module_exit(exit_jfs_fs) 1070