1 /* -*- mode: c; c-basic-offset: 8; -*- 2 * vim: noexpandtab sw=8 ts=8 sts=0: 3 * 4 * namei.c 5 * 6 * Create and rename file, directory, symlinks 7 * 8 * Copyright (C) 2002, 2004 Oracle. All rights reserved. 9 * 10 * Portions of this code from linux/fs/ext3/dir.c 11 * 12 * Copyright (C) 1992, 1993, 1994, 1995 13 * Remy Card (card@masi.ibp.fr) 14 * Laboratoire MASI - Institut Blaise pascal 15 * Universite Pierre et Marie Curie (Paris VI) 16 * 17 * from 18 * 19 * linux/fs/minix/dir.c 20 * 21 * Copyright (C) 1991, 1992 Linux Torvalds 22 * 23 * This program is free software; you can redistribute it and/or 24 * modify it under the terms of the GNU General Public 25 * License as published by the Free Software Foundation; either 26 * version 2 of the License, or (at your option) any later version. 27 * 28 * This program is distributed in the hope that it will be useful, 29 * but WITHOUT ANY WARRANTY; without even the implied warranty of 30 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 31 * General Public License for more details. 32 * 33 * You should have received a copy of the GNU General Public 34 * License along with this program; if not, write to the 35 * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 36 * Boston, MA 021110-1307, USA. 37 */ 38 39 #include <linux/fs.h> 40 #include <linux/types.h> 41 #include <linux/slab.h> 42 #include <linux/highmem.h> 43 #include <linux/quotaops.h> 44 45 #include <cluster/masklog.h> 46 47 #include "ocfs2.h" 48 49 #include "alloc.h" 50 #include "dcache.h" 51 #include "dir.h" 52 #include "dlmglue.h" 53 #include "extent_map.h" 54 #include "file.h" 55 #include "inode.h" 56 #include "journal.h" 57 #include "namei.h" 58 #include "suballoc.h" 59 #include "super.h" 60 #include "symlink.h" 61 #include "sysfile.h" 62 #include "uptodate.h" 63 #include "xattr.h" 64 #include "acl.h" 65 #include "ocfs2_trace.h" 66 67 #include "buffer_head_io.h" 68 69 static int ocfs2_mknod_locked(struct ocfs2_super *osb, 70 struct inode *dir, 71 struct inode *inode, 72 dev_t dev, 73 struct buffer_head **new_fe_bh, 74 struct buffer_head *parent_fe_bh, 75 handle_t *handle, 76 struct ocfs2_alloc_context *inode_ac); 77 78 static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb, 79 struct inode **ret_orphan_dir, 80 u64 blkno, 81 char *name, 82 struct ocfs2_dir_lookup_result *lookup); 83 84 static int ocfs2_orphan_add(struct ocfs2_super *osb, 85 handle_t *handle, 86 struct inode *inode, 87 struct buffer_head *fe_bh, 88 char *name, 89 struct ocfs2_dir_lookup_result *lookup, 90 struct inode *orphan_dir_inode); 91 92 static int ocfs2_create_symlink_data(struct ocfs2_super *osb, 93 handle_t *handle, 94 struct inode *inode, 95 const char *symname); 96 97 /* An orphan dir name is an 8 byte value, printed as a hex string */ 98 #define OCFS2_ORPHAN_NAMELEN ((int)(2 * sizeof(u64))) 99 100 static struct dentry *ocfs2_lookup(struct inode *dir, struct dentry *dentry, 101 struct nameidata *nd) 102 { 103 int status; 104 u64 blkno; 105 struct inode *inode = NULL; 106 struct dentry *ret; 107 struct ocfs2_inode_info *oi; 108 109 trace_ocfs2_lookup(dir, dentry, dentry->d_name.len, 110 dentry->d_name.name, 111 (unsigned long long)OCFS2_I(dir)->ip_blkno, 0); 112 113 if (dentry->d_name.len > OCFS2_MAX_FILENAME_LEN) { 114 ret = ERR_PTR(-ENAMETOOLONG); 115 goto bail; 116 } 117 118 status = ocfs2_inode_lock_nested(dir, NULL, 0, OI_LS_PARENT); 119 if (status < 0) { 120 if (status != -ENOENT) 121 mlog_errno(status); 122 ret = ERR_PTR(status); 123 goto bail; 124 } 125 126 status = ocfs2_lookup_ino_from_name(dir, dentry->d_name.name, 127 dentry->d_name.len, &blkno); 128 if (status < 0) 129 goto bail_add; 130 131 inode = ocfs2_iget(OCFS2_SB(dir->i_sb), blkno, 0, 0); 132 if (IS_ERR(inode)) { 133 ret = ERR_PTR(-EACCES); 134 goto bail_unlock; 135 } 136 137 oi = OCFS2_I(inode); 138 /* Clear any orphaned state... If we were able to look up the 139 * inode from a directory, it certainly can't be orphaned. We 140 * might have the bad state from a node which intended to 141 * orphan this inode but crashed before it could commit the 142 * unlink. */ 143 spin_lock(&oi->ip_lock); 144 oi->ip_flags &= ~OCFS2_INODE_MAYBE_ORPHANED; 145 spin_unlock(&oi->ip_lock); 146 147 bail_add: 148 ret = d_splice_alias(inode, dentry); 149 150 if (inode) { 151 /* 152 * If d_splice_alias() finds a DCACHE_DISCONNECTED 153 * dentry, it will d_move() it on top of ourse. The 154 * return value will indicate this however, so in 155 * those cases, we switch them around for the locking 156 * code. 157 * 158 * NOTE: This dentry already has ->d_op set from 159 * ocfs2_get_parent() and ocfs2_get_dentry() 160 */ 161 if (ret) 162 dentry = ret; 163 164 status = ocfs2_dentry_attach_lock(dentry, inode, 165 OCFS2_I(dir)->ip_blkno); 166 if (status) { 167 mlog_errno(status); 168 ret = ERR_PTR(status); 169 goto bail_unlock; 170 } 171 } else 172 ocfs2_dentry_attach_gen(dentry); 173 174 bail_unlock: 175 /* Don't drop the cluster lock until *after* the d_add -- 176 * unlink on another node will message us to remove that 177 * dentry under this lock so otherwise we can race this with 178 * the downconvert thread and have a stale dentry. */ 179 ocfs2_inode_unlock(dir, 0); 180 181 bail: 182 183 trace_ocfs2_lookup_ret(ret); 184 185 return ret; 186 } 187 188 static struct inode *ocfs2_get_init_inode(struct inode *dir, umode_t mode) 189 { 190 struct inode *inode; 191 192 inode = new_inode(dir->i_sb); 193 if (!inode) { 194 mlog(ML_ERROR, "new_inode failed!\n"); 195 return NULL; 196 } 197 198 /* populate as many fields early on as possible - many of 199 * these are used by the support functions here and in 200 * callers. */ 201 if (S_ISDIR(mode)) 202 set_nlink(inode, 2); 203 inode_init_owner(inode, dir, mode); 204 dquot_initialize(inode); 205 return inode; 206 } 207 208 static int ocfs2_mknod(struct inode *dir, 209 struct dentry *dentry, 210 umode_t mode, 211 dev_t dev) 212 { 213 int status = 0; 214 struct buffer_head *parent_fe_bh = NULL; 215 handle_t *handle = NULL; 216 struct ocfs2_super *osb; 217 struct ocfs2_dinode *dirfe; 218 struct buffer_head *new_fe_bh = NULL; 219 struct inode *inode = NULL; 220 struct ocfs2_alloc_context *inode_ac = NULL; 221 struct ocfs2_alloc_context *data_ac = NULL; 222 struct ocfs2_alloc_context *meta_ac = NULL; 223 int want_clusters = 0; 224 int want_meta = 0; 225 int xattr_credits = 0; 226 struct ocfs2_security_xattr_info si = { 227 .enable = 1, 228 }; 229 int did_quota_inode = 0; 230 struct ocfs2_dir_lookup_result lookup = { NULL, }; 231 sigset_t oldset; 232 int did_block_signals = 0; 233 234 trace_ocfs2_mknod(dir, dentry, dentry->d_name.len, dentry->d_name.name, 235 (unsigned long long)OCFS2_I(dir)->ip_blkno, 236 (unsigned long)dev, mode); 237 238 dquot_initialize(dir); 239 240 /* get our super block */ 241 osb = OCFS2_SB(dir->i_sb); 242 243 status = ocfs2_inode_lock(dir, &parent_fe_bh, 1); 244 if (status < 0) { 245 if (status != -ENOENT) 246 mlog_errno(status); 247 return status; 248 } 249 250 if (S_ISDIR(mode) && (dir->i_nlink >= ocfs2_link_max(osb))) { 251 status = -EMLINK; 252 goto leave; 253 } 254 255 dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data; 256 if (!ocfs2_read_links_count(dirfe)) { 257 /* can't make a file in a deleted directory. */ 258 status = -ENOENT; 259 goto leave; 260 } 261 262 status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name, 263 dentry->d_name.len); 264 if (status) 265 goto leave; 266 267 /* get a spot inside the dir. */ 268 status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh, 269 dentry->d_name.name, 270 dentry->d_name.len, &lookup); 271 if (status < 0) { 272 mlog_errno(status); 273 goto leave; 274 } 275 276 /* reserve an inode spot */ 277 status = ocfs2_reserve_new_inode(osb, &inode_ac); 278 if (status < 0) { 279 if (status != -ENOSPC) 280 mlog_errno(status); 281 goto leave; 282 } 283 284 inode = ocfs2_get_init_inode(dir, mode); 285 if (!inode) { 286 status = -ENOMEM; 287 mlog_errno(status); 288 goto leave; 289 } 290 291 /* get security xattr */ 292 status = ocfs2_init_security_get(inode, dir, &dentry->d_name, &si); 293 if (status) { 294 if (status == -EOPNOTSUPP) 295 si.enable = 0; 296 else { 297 mlog_errno(status); 298 goto leave; 299 } 300 } 301 302 /* calculate meta data/clusters for setting security and acl xattr */ 303 status = ocfs2_calc_xattr_init(dir, parent_fe_bh, mode, 304 &si, &want_clusters, 305 &xattr_credits, &want_meta); 306 if (status < 0) { 307 mlog_errno(status); 308 goto leave; 309 } 310 311 /* Reserve a cluster if creating an extent based directory. */ 312 if (S_ISDIR(mode) && !ocfs2_supports_inline_data(osb)) { 313 want_clusters += 1; 314 315 /* Dir indexing requires extra space as well */ 316 if (ocfs2_supports_indexed_dirs(osb)) 317 want_meta++; 318 } 319 320 status = ocfs2_reserve_new_metadata_blocks(osb, want_meta, &meta_ac); 321 if (status < 0) { 322 if (status != -ENOSPC) 323 mlog_errno(status); 324 goto leave; 325 } 326 327 status = ocfs2_reserve_clusters(osb, want_clusters, &data_ac); 328 if (status < 0) { 329 if (status != -ENOSPC) 330 mlog_errno(status); 331 goto leave; 332 } 333 334 handle = ocfs2_start_trans(osb, ocfs2_mknod_credits(osb->sb, 335 S_ISDIR(mode), 336 xattr_credits)); 337 if (IS_ERR(handle)) { 338 status = PTR_ERR(handle); 339 handle = NULL; 340 mlog_errno(status); 341 goto leave; 342 } 343 344 /* Starting to change things, restart is no longer possible. */ 345 ocfs2_block_signals(&oldset); 346 did_block_signals = 1; 347 348 status = dquot_alloc_inode(inode); 349 if (status) 350 goto leave; 351 did_quota_inode = 1; 352 353 /* do the real work now. */ 354 status = ocfs2_mknod_locked(osb, dir, inode, dev, 355 &new_fe_bh, parent_fe_bh, handle, 356 inode_ac); 357 if (status < 0) { 358 mlog_errno(status); 359 goto leave; 360 } 361 362 if (S_ISDIR(mode)) { 363 status = ocfs2_fill_new_dir(osb, handle, dir, inode, 364 new_fe_bh, data_ac, meta_ac); 365 if (status < 0) { 366 mlog_errno(status); 367 goto leave; 368 } 369 370 status = ocfs2_journal_access_di(handle, INODE_CACHE(dir), 371 parent_fe_bh, 372 OCFS2_JOURNAL_ACCESS_WRITE); 373 if (status < 0) { 374 mlog_errno(status); 375 goto leave; 376 } 377 ocfs2_add_links_count(dirfe, 1); 378 ocfs2_journal_dirty(handle, parent_fe_bh); 379 inc_nlink(dir); 380 } 381 382 status = ocfs2_init_acl(handle, inode, dir, new_fe_bh, parent_fe_bh, 383 meta_ac, data_ac); 384 if (status < 0) { 385 mlog_errno(status); 386 goto leave; 387 } 388 389 if (si.enable) { 390 status = ocfs2_init_security_set(handle, inode, new_fe_bh, &si, 391 meta_ac, data_ac); 392 if (status < 0) { 393 mlog_errno(status); 394 goto leave; 395 } 396 } 397 398 /* 399 * Do this before adding the entry to the directory. We add 400 * also set d_op after success so that ->d_iput() will cleanup 401 * the dentry lock even if ocfs2_add_entry() fails below. 402 */ 403 status = ocfs2_dentry_attach_lock(dentry, inode, 404 OCFS2_I(dir)->ip_blkno); 405 if (status) { 406 mlog_errno(status); 407 goto leave; 408 } 409 410 status = ocfs2_add_entry(handle, dentry, inode, 411 OCFS2_I(inode)->ip_blkno, parent_fe_bh, 412 &lookup); 413 if (status < 0) { 414 mlog_errno(status); 415 goto leave; 416 } 417 418 insert_inode_hash(inode); 419 d_instantiate(dentry, inode); 420 status = 0; 421 leave: 422 if (status < 0 && did_quota_inode) 423 dquot_free_inode(inode); 424 if (handle) 425 ocfs2_commit_trans(osb, handle); 426 427 ocfs2_inode_unlock(dir, 1); 428 if (did_block_signals) 429 ocfs2_unblock_signals(&oldset); 430 431 brelse(new_fe_bh); 432 brelse(parent_fe_bh); 433 kfree(si.name); 434 kfree(si.value); 435 436 ocfs2_free_dir_lookup_result(&lookup); 437 438 if (inode_ac) 439 ocfs2_free_alloc_context(inode_ac); 440 441 if (data_ac) 442 ocfs2_free_alloc_context(data_ac); 443 444 if (meta_ac) 445 ocfs2_free_alloc_context(meta_ac); 446 447 /* 448 * We should call iput after the i_mutex of the bitmap been 449 * unlocked in ocfs2_free_alloc_context, or the 450 * ocfs2_delete_inode will mutex_lock again. 451 */ 452 if ((status < 0) && inode) { 453 OCFS2_I(inode)->ip_flags |= OCFS2_INODE_SKIP_ORPHAN_DIR; 454 clear_nlink(inode); 455 iput(inode); 456 } 457 458 if (status) 459 mlog_errno(status); 460 461 return status; 462 } 463 464 static int __ocfs2_mknod_locked(struct inode *dir, 465 struct inode *inode, 466 dev_t dev, 467 struct buffer_head **new_fe_bh, 468 struct buffer_head *parent_fe_bh, 469 handle_t *handle, 470 struct ocfs2_alloc_context *inode_ac, 471 u64 fe_blkno, u64 suballoc_loc, u16 suballoc_bit) 472 { 473 int status = 0; 474 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb); 475 struct ocfs2_dinode *fe = NULL; 476 struct ocfs2_extent_list *fel; 477 u16 feat; 478 479 *new_fe_bh = NULL; 480 481 /* populate as many fields early on as possible - many of 482 * these are used by the support functions here and in 483 * callers. */ 484 inode->i_ino = ino_from_blkno(osb->sb, fe_blkno); 485 OCFS2_I(inode)->ip_blkno = fe_blkno; 486 spin_lock(&osb->osb_lock); 487 inode->i_generation = osb->s_next_generation++; 488 spin_unlock(&osb->osb_lock); 489 490 *new_fe_bh = sb_getblk(osb->sb, fe_blkno); 491 if (!*new_fe_bh) { 492 status = -EIO; 493 mlog_errno(status); 494 goto leave; 495 } 496 ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), *new_fe_bh); 497 498 status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), 499 *new_fe_bh, 500 OCFS2_JOURNAL_ACCESS_CREATE); 501 if (status < 0) { 502 mlog_errno(status); 503 goto leave; 504 } 505 506 fe = (struct ocfs2_dinode *) (*new_fe_bh)->b_data; 507 memset(fe, 0, osb->sb->s_blocksize); 508 509 fe->i_generation = cpu_to_le32(inode->i_generation); 510 fe->i_fs_generation = cpu_to_le32(osb->fs_generation); 511 fe->i_blkno = cpu_to_le64(fe_blkno); 512 fe->i_suballoc_loc = cpu_to_le64(suballoc_loc); 513 fe->i_suballoc_bit = cpu_to_le16(suballoc_bit); 514 fe->i_suballoc_slot = cpu_to_le16(inode_ac->ac_alloc_slot); 515 fe->i_uid = cpu_to_le32(inode->i_uid); 516 fe->i_gid = cpu_to_le32(inode->i_gid); 517 fe->i_mode = cpu_to_le16(inode->i_mode); 518 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) 519 fe->id1.dev1.i_rdev = cpu_to_le64(huge_encode_dev(dev)); 520 521 ocfs2_set_links_count(fe, inode->i_nlink); 522 523 fe->i_last_eb_blk = 0; 524 strcpy(fe->i_signature, OCFS2_INODE_SIGNATURE); 525 le32_add_cpu(&fe->i_flags, OCFS2_VALID_FL); 526 fe->i_atime = fe->i_ctime = fe->i_mtime = 527 cpu_to_le64(CURRENT_TIME.tv_sec); 528 fe->i_mtime_nsec = fe->i_ctime_nsec = fe->i_atime_nsec = 529 cpu_to_le32(CURRENT_TIME.tv_nsec); 530 fe->i_dtime = 0; 531 532 /* 533 * If supported, directories start with inline data. If inline 534 * isn't supported, but indexing is, we start them as indexed. 535 */ 536 feat = le16_to_cpu(fe->i_dyn_features); 537 if (S_ISDIR(inode->i_mode) && ocfs2_supports_inline_data(osb)) { 538 fe->i_dyn_features = cpu_to_le16(feat | OCFS2_INLINE_DATA_FL); 539 540 fe->id2.i_data.id_count = cpu_to_le16( 541 ocfs2_max_inline_data_with_xattr(osb->sb, fe)); 542 } else { 543 fel = &fe->id2.i_list; 544 fel->l_tree_depth = 0; 545 fel->l_next_free_rec = 0; 546 fel->l_count = cpu_to_le16(ocfs2_extent_recs_per_inode(osb->sb)); 547 } 548 549 ocfs2_journal_dirty(handle, *new_fe_bh); 550 551 ocfs2_populate_inode(inode, fe, 1); 552 ocfs2_ci_set_new(osb, INODE_CACHE(inode)); 553 if (!ocfs2_mount_local(osb)) { 554 status = ocfs2_create_new_inode_locks(inode); 555 if (status < 0) 556 mlog_errno(status); 557 } 558 559 status = 0; /* error in ocfs2_create_new_inode_locks is not 560 * critical */ 561 562 leave: 563 if (status < 0) { 564 if (*new_fe_bh) { 565 brelse(*new_fe_bh); 566 *new_fe_bh = NULL; 567 } 568 } 569 570 if (status) 571 mlog_errno(status); 572 return status; 573 } 574 575 static int ocfs2_mknod_locked(struct ocfs2_super *osb, 576 struct inode *dir, 577 struct inode *inode, 578 dev_t dev, 579 struct buffer_head **new_fe_bh, 580 struct buffer_head *parent_fe_bh, 581 handle_t *handle, 582 struct ocfs2_alloc_context *inode_ac) 583 { 584 int status = 0; 585 u64 suballoc_loc, fe_blkno = 0; 586 u16 suballoc_bit; 587 588 *new_fe_bh = NULL; 589 590 status = ocfs2_claim_new_inode(handle, dir, parent_fe_bh, 591 inode_ac, &suballoc_loc, 592 &suballoc_bit, &fe_blkno); 593 if (status < 0) { 594 mlog_errno(status); 595 return status; 596 } 597 598 return __ocfs2_mknod_locked(dir, inode, dev, new_fe_bh, 599 parent_fe_bh, handle, inode_ac, 600 fe_blkno, suballoc_loc, suballoc_bit); 601 } 602 603 static int ocfs2_mkdir(struct inode *dir, 604 struct dentry *dentry, 605 umode_t mode) 606 { 607 int ret; 608 609 trace_ocfs2_mkdir(dir, dentry, dentry->d_name.len, dentry->d_name.name, 610 OCFS2_I(dir)->ip_blkno, mode); 611 ret = ocfs2_mknod(dir, dentry, mode | S_IFDIR, 0); 612 if (ret) 613 mlog_errno(ret); 614 615 return ret; 616 } 617 618 static int ocfs2_create(struct inode *dir, 619 struct dentry *dentry, 620 umode_t mode, 621 struct nameidata *nd) 622 { 623 int ret; 624 625 trace_ocfs2_create(dir, dentry, dentry->d_name.len, dentry->d_name.name, 626 (unsigned long long)OCFS2_I(dir)->ip_blkno, mode); 627 ret = ocfs2_mknod(dir, dentry, mode | S_IFREG, 0); 628 if (ret) 629 mlog_errno(ret); 630 631 return ret; 632 } 633 634 static int ocfs2_link(struct dentry *old_dentry, 635 struct inode *dir, 636 struct dentry *dentry) 637 { 638 handle_t *handle; 639 struct inode *inode = old_dentry->d_inode; 640 int err; 641 struct buffer_head *fe_bh = NULL; 642 struct buffer_head *parent_fe_bh = NULL; 643 struct ocfs2_dinode *fe = NULL; 644 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb); 645 struct ocfs2_dir_lookup_result lookup = { NULL, }; 646 sigset_t oldset; 647 648 trace_ocfs2_link((unsigned long long)OCFS2_I(inode)->ip_blkno, 649 old_dentry->d_name.len, old_dentry->d_name.name, 650 dentry->d_name.len, dentry->d_name.name); 651 652 if (S_ISDIR(inode->i_mode)) 653 return -EPERM; 654 655 dquot_initialize(dir); 656 657 err = ocfs2_inode_lock_nested(dir, &parent_fe_bh, 1, OI_LS_PARENT); 658 if (err < 0) { 659 if (err != -ENOENT) 660 mlog_errno(err); 661 return err; 662 } 663 664 if (!dir->i_nlink) { 665 err = -ENOENT; 666 goto out; 667 } 668 669 err = ocfs2_check_dir_for_entry(dir, dentry->d_name.name, 670 dentry->d_name.len); 671 if (err) 672 goto out; 673 674 err = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh, 675 dentry->d_name.name, 676 dentry->d_name.len, &lookup); 677 if (err < 0) { 678 mlog_errno(err); 679 goto out; 680 } 681 682 err = ocfs2_inode_lock(inode, &fe_bh, 1); 683 if (err < 0) { 684 if (err != -ENOENT) 685 mlog_errno(err); 686 goto out; 687 } 688 689 fe = (struct ocfs2_dinode *) fe_bh->b_data; 690 if (ocfs2_read_links_count(fe) >= ocfs2_link_max(osb)) { 691 err = -EMLINK; 692 goto out_unlock_inode; 693 } 694 695 handle = ocfs2_start_trans(osb, ocfs2_link_credits(osb->sb)); 696 if (IS_ERR(handle)) { 697 err = PTR_ERR(handle); 698 handle = NULL; 699 mlog_errno(err); 700 goto out_unlock_inode; 701 } 702 703 /* Starting to change things, restart is no longer possible. */ 704 ocfs2_block_signals(&oldset); 705 706 err = ocfs2_journal_access_di(handle, INODE_CACHE(inode), fe_bh, 707 OCFS2_JOURNAL_ACCESS_WRITE); 708 if (err < 0) { 709 mlog_errno(err); 710 goto out_commit; 711 } 712 713 inc_nlink(inode); 714 inode->i_ctime = CURRENT_TIME; 715 ocfs2_set_links_count(fe, inode->i_nlink); 716 fe->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec); 717 fe->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec); 718 ocfs2_journal_dirty(handle, fe_bh); 719 720 err = ocfs2_add_entry(handle, dentry, inode, 721 OCFS2_I(inode)->ip_blkno, 722 parent_fe_bh, &lookup); 723 if (err) { 724 ocfs2_add_links_count(fe, -1); 725 drop_nlink(inode); 726 mlog_errno(err); 727 goto out_commit; 728 } 729 730 err = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno); 731 if (err) { 732 mlog_errno(err); 733 goto out_commit; 734 } 735 736 ihold(inode); 737 d_instantiate(dentry, inode); 738 739 out_commit: 740 ocfs2_commit_trans(osb, handle); 741 ocfs2_unblock_signals(&oldset); 742 out_unlock_inode: 743 ocfs2_inode_unlock(inode, 1); 744 745 out: 746 ocfs2_inode_unlock(dir, 1); 747 748 brelse(fe_bh); 749 brelse(parent_fe_bh); 750 751 ocfs2_free_dir_lookup_result(&lookup); 752 753 if (err) 754 mlog_errno(err); 755 756 return err; 757 } 758 759 /* 760 * Takes and drops an exclusive lock on the given dentry. This will 761 * force other nodes to drop it. 762 */ 763 static int ocfs2_remote_dentry_delete(struct dentry *dentry) 764 { 765 int ret; 766 767 ret = ocfs2_dentry_lock(dentry, 1); 768 if (ret) 769 mlog_errno(ret); 770 else 771 ocfs2_dentry_unlock(dentry, 1); 772 773 return ret; 774 } 775 776 static inline int inode_is_unlinkable(struct inode *inode) 777 { 778 if (S_ISDIR(inode->i_mode)) { 779 if (inode->i_nlink == 2) 780 return 1; 781 return 0; 782 } 783 784 if (inode->i_nlink == 1) 785 return 1; 786 return 0; 787 } 788 789 static int ocfs2_unlink(struct inode *dir, 790 struct dentry *dentry) 791 { 792 int status; 793 int child_locked = 0; 794 struct inode *inode = dentry->d_inode; 795 struct inode *orphan_dir = NULL; 796 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb); 797 u64 blkno; 798 struct ocfs2_dinode *fe = NULL; 799 struct buffer_head *fe_bh = NULL; 800 struct buffer_head *parent_node_bh = NULL; 801 handle_t *handle = NULL; 802 char orphan_name[OCFS2_ORPHAN_NAMELEN + 1]; 803 struct ocfs2_dir_lookup_result lookup = { NULL, }; 804 struct ocfs2_dir_lookup_result orphan_insert = { NULL, }; 805 806 trace_ocfs2_unlink(dir, dentry, dentry->d_name.len, 807 dentry->d_name.name, 808 (unsigned long long)OCFS2_I(dir)->ip_blkno, 809 (unsigned long long)OCFS2_I(inode)->ip_blkno); 810 811 dquot_initialize(dir); 812 813 BUG_ON(dentry->d_parent->d_inode != dir); 814 815 if (inode == osb->root_inode) 816 return -EPERM; 817 818 status = ocfs2_inode_lock_nested(dir, &parent_node_bh, 1, 819 OI_LS_PARENT); 820 if (status < 0) { 821 if (status != -ENOENT) 822 mlog_errno(status); 823 return status; 824 } 825 826 status = ocfs2_find_files_on_disk(dentry->d_name.name, 827 dentry->d_name.len, &blkno, dir, 828 &lookup); 829 if (status < 0) { 830 if (status != -ENOENT) 831 mlog_errno(status); 832 goto leave; 833 } 834 835 if (OCFS2_I(inode)->ip_blkno != blkno) { 836 status = -ENOENT; 837 838 trace_ocfs2_unlink_noent( 839 (unsigned long long)OCFS2_I(inode)->ip_blkno, 840 (unsigned long long)blkno, 841 OCFS2_I(inode)->ip_flags); 842 goto leave; 843 } 844 845 status = ocfs2_inode_lock(inode, &fe_bh, 1); 846 if (status < 0) { 847 if (status != -ENOENT) 848 mlog_errno(status); 849 goto leave; 850 } 851 child_locked = 1; 852 853 if (S_ISDIR(inode->i_mode)) { 854 if (inode->i_nlink != 2 || !ocfs2_empty_dir(inode)) { 855 status = -ENOTEMPTY; 856 goto leave; 857 } 858 } 859 860 status = ocfs2_remote_dentry_delete(dentry); 861 if (status < 0) { 862 /* This remote delete should succeed under all normal 863 * circumstances. */ 864 mlog_errno(status); 865 goto leave; 866 } 867 868 if (inode_is_unlinkable(inode)) { 869 status = ocfs2_prepare_orphan_dir(osb, &orphan_dir, 870 OCFS2_I(inode)->ip_blkno, 871 orphan_name, &orphan_insert); 872 if (status < 0) { 873 mlog_errno(status); 874 goto leave; 875 } 876 } 877 878 handle = ocfs2_start_trans(osb, ocfs2_unlink_credits(osb->sb)); 879 if (IS_ERR(handle)) { 880 status = PTR_ERR(handle); 881 handle = NULL; 882 mlog_errno(status); 883 goto leave; 884 } 885 886 status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), fe_bh, 887 OCFS2_JOURNAL_ACCESS_WRITE); 888 if (status < 0) { 889 mlog_errno(status); 890 goto leave; 891 } 892 893 fe = (struct ocfs2_dinode *) fe_bh->b_data; 894 895 if (inode_is_unlinkable(inode)) { 896 status = ocfs2_orphan_add(osb, handle, inode, fe_bh, orphan_name, 897 &orphan_insert, orphan_dir); 898 if (status < 0) { 899 mlog_errno(status); 900 goto leave; 901 } 902 } 903 904 /* delete the name from the parent dir */ 905 status = ocfs2_delete_entry(handle, dir, &lookup); 906 if (status < 0) { 907 mlog_errno(status); 908 goto leave; 909 } 910 911 if (S_ISDIR(inode->i_mode)) 912 drop_nlink(inode); 913 drop_nlink(inode); 914 ocfs2_set_links_count(fe, inode->i_nlink); 915 ocfs2_journal_dirty(handle, fe_bh); 916 917 dir->i_ctime = dir->i_mtime = CURRENT_TIME; 918 if (S_ISDIR(inode->i_mode)) 919 drop_nlink(dir); 920 921 status = ocfs2_mark_inode_dirty(handle, dir, parent_node_bh); 922 if (status < 0) { 923 mlog_errno(status); 924 if (S_ISDIR(inode->i_mode)) 925 inc_nlink(dir); 926 } 927 928 leave: 929 if (handle) 930 ocfs2_commit_trans(osb, handle); 931 932 if (child_locked) 933 ocfs2_inode_unlock(inode, 1); 934 935 ocfs2_inode_unlock(dir, 1); 936 937 if (orphan_dir) { 938 /* This was locked for us in ocfs2_prepare_orphan_dir() */ 939 ocfs2_inode_unlock(orphan_dir, 1); 940 mutex_unlock(&orphan_dir->i_mutex); 941 iput(orphan_dir); 942 } 943 944 brelse(fe_bh); 945 brelse(parent_node_bh); 946 947 ocfs2_free_dir_lookup_result(&orphan_insert); 948 ocfs2_free_dir_lookup_result(&lookup); 949 950 if (status) 951 mlog_errno(status); 952 953 return status; 954 } 955 956 /* 957 * The only place this should be used is rename! 958 * if they have the same id, then the 1st one is the only one locked. 959 */ 960 static int ocfs2_double_lock(struct ocfs2_super *osb, 961 struct buffer_head **bh1, 962 struct inode *inode1, 963 struct buffer_head **bh2, 964 struct inode *inode2) 965 { 966 int status; 967 struct ocfs2_inode_info *oi1 = OCFS2_I(inode1); 968 struct ocfs2_inode_info *oi2 = OCFS2_I(inode2); 969 struct buffer_head **tmpbh; 970 struct inode *tmpinode; 971 972 trace_ocfs2_double_lock((unsigned long long)oi1->ip_blkno, 973 (unsigned long long)oi2->ip_blkno); 974 975 if (*bh1) 976 *bh1 = NULL; 977 if (*bh2) 978 *bh2 = NULL; 979 980 /* we always want to lock the one with the lower lockid first. */ 981 if (oi1->ip_blkno != oi2->ip_blkno) { 982 if (oi1->ip_blkno < oi2->ip_blkno) { 983 /* switch id1 and id2 around */ 984 tmpbh = bh2; 985 bh2 = bh1; 986 bh1 = tmpbh; 987 988 tmpinode = inode2; 989 inode2 = inode1; 990 inode1 = tmpinode; 991 } 992 /* lock id2 */ 993 status = ocfs2_inode_lock_nested(inode2, bh2, 1, 994 OI_LS_RENAME1); 995 if (status < 0) { 996 if (status != -ENOENT) 997 mlog_errno(status); 998 goto bail; 999 } 1000 } 1001 1002 /* lock id1 */ 1003 status = ocfs2_inode_lock_nested(inode1, bh1, 1, OI_LS_RENAME2); 1004 if (status < 0) { 1005 /* 1006 * An error return must mean that no cluster locks 1007 * were held on function exit. 1008 */ 1009 if (oi1->ip_blkno != oi2->ip_blkno) { 1010 ocfs2_inode_unlock(inode2, 1); 1011 brelse(*bh2); 1012 *bh2 = NULL; 1013 } 1014 1015 if (status != -ENOENT) 1016 mlog_errno(status); 1017 } 1018 1019 trace_ocfs2_double_lock_end( 1020 (unsigned long long)OCFS2_I(inode1)->ip_blkno, 1021 (unsigned long long)OCFS2_I(inode2)->ip_blkno); 1022 1023 bail: 1024 if (status) 1025 mlog_errno(status); 1026 return status; 1027 } 1028 1029 static void ocfs2_double_unlock(struct inode *inode1, struct inode *inode2) 1030 { 1031 ocfs2_inode_unlock(inode1, 1); 1032 1033 if (inode1 != inode2) 1034 ocfs2_inode_unlock(inode2, 1); 1035 } 1036 1037 static int ocfs2_rename(struct inode *old_dir, 1038 struct dentry *old_dentry, 1039 struct inode *new_dir, 1040 struct dentry *new_dentry) 1041 { 1042 int status = 0, rename_lock = 0, parents_locked = 0, target_exists = 0; 1043 int old_child_locked = 0, new_child_locked = 0, update_dot_dot = 0; 1044 struct inode *old_inode = old_dentry->d_inode; 1045 struct inode *new_inode = new_dentry->d_inode; 1046 struct inode *orphan_dir = NULL; 1047 struct ocfs2_dinode *newfe = NULL; 1048 char orphan_name[OCFS2_ORPHAN_NAMELEN + 1]; 1049 struct buffer_head *newfe_bh = NULL; 1050 struct buffer_head *old_inode_bh = NULL; 1051 struct ocfs2_super *osb = NULL; 1052 u64 newfe_blkno, old_de_ino; 1053 handle_t *handle = NULL; 1054 struct buffer_head *old_dir_bh = NULL; 1055 struct buffer_head *new_dir_bh = NULL; 1056 nlink_t old_dir_nlink = old_dir->i_nlink; 1057 struct ocfs2_dinode *old_di; 1058 struct ocfs2_dir_lookup_result old_inode_dot_dot_res = { NULL, }; 1059 struct ocfs2_dir_lookup_result target_lookup_res = { NULL, }; 1060 struct ocfs2_dir_lookup_result old_entry_lookup = { NULL, }; 1061 struct ocfs2_dir_lookup_result orphan_insert = { NULL, }; 1062 struct ocfs2_dir_lookup_result target_insert = { NULL, }; 1063 1064 /* At some point it might be nice to break this function up a 1065 * bit. */ 1066 1067 trace_ocfs2_rename(old_dir, old_dentry, new_dir, new_dentry, 1068 old_dentry->d_name.len, old_dentry->d_name.name, 1069 new_dentry->d_name.len, new_dentry->d_name.name); 1070 1071 dquot_initialize(old_dir); 1072 dquot_initialize(new_dir); 1073 1074 osb = OCFS2_SB(old_dir->i_sb); 1075 1076 if (new_inode) { 1077 if (!igrab(new_inode)) 1078 BUG(); 1079 } 1080 1081 /* Assume a directory hierarchy thusly: 1082 * a/b/c 1083 * a/d 1084 * a,b,c, and d are all directories. 1085 * 1086 * from cwd of 'a' on both nodes: 1087 * node1: mv b/c d 1088 * node2: mv d b/c 1089 * 1090 * And that's why, just like the VFS, we need a file system 1091 * rename lock. */ 1092 if (old_dir != new_dir && S_ISDIR(old_inode->i_mode)) { 1093 status = ocfs2_rename_lock(osb); 1094 if (status < 0) { 1095 mlog_errno(status); 1096 goto bail; 1097 } 1098 rename_lock = 1; 1099 } 1100 1101 /* if old and new are the same, this'll just do one lock. */ 1102 status = ocfs2_double_lock(osb, &old_dir_bh, old_dir, 1103 &new_dir_bh, new_dir); 1104 if (status < 0) { 1105 mlog_errno(status); 1106 goto bail; 1107 } 1108 parents_locked = 1; 1109 1110 /* make sure both dirs have bhs 1111 * get an extra ref on old_dir_bh if old==new */ 1112 if (!new_dir_bh) { 1113 if (old_dir_bh) { 1114 new_dir_bh = old_dir_bh; 1115 get_bh(new_dir_bh); 1116 } else { 1117 mlog(ML_ERROR, "no old_dir_bh!\n"); 1118 status = -EIO; 1119 goto bail; 1120 } 1121 } 1122 1123 /* 1124 * Aside from allowing a meta data update, the locking here 1125 * also ensures that the downconvert thread on other nodes 1126 * won't have to concurrently downconvert the inode and the 1127 * dentry locks. 1128 */ 1129 status = ocfs2_inode_lock_nested(old_inode, &old_inode_bh, 1, 1130 OI_LS_PARENT); 1131 if (status < 0) { 1132 if (status != -ENOENT) 1133 mlog_errno(status); 1134 goto bail; 1135 } 1136 old_child_locked = 1; 1137 1138 status = ocfs2_remote_dentry_delete(old_dentry); 1139 if (status < 0) { 1140 mlog_errno(status); 1141 goto bail; 1142 } 1143 1144 if (S_ISDIR(old_inode->i_mode)) { 1145 u64 old_inode_parent; 1146 1147 update_dot_dot = 1; 1148 status = ocfs2_find_files_on_disk("..", 2, &old_inode_parent, 1149 old_inode, 1150 &old_inode_dot_dot_res); 1151 if (status) { 1152 status = -EIO; 1153 goto bail; 1154 } 1155 1156 if (old_inode_parent != OCFS2_I(old_dir)->ip_blkno) { 1157 status = -EIO; 1158 goto bail; 1159 } 1160 1161 if (!new_inode && new_dir != old_dir && 1162 new_dir->i_nlink >= ocfs2_link_max(osb)) { 1163 status = -EMLINK; 1164 goto bail; 1165 } 1166 } 1167 1168 status = ocfs2_lookup_ino_from_name(old_dir, old_dentry->d_name.name, 1169 old_dentry->d_name.len, 1170 &old_de_ino); 1171 if (status) { 1172 status = -ENOENT; 1173 goto bail; 1174 } 1175 1176 /* 1177 * Check for inode number is _not_ due to possible IO errors. 1178 * We might rmdir the source, keep it as pwd of some process 1179 * and merrily kill the link to whatever was created under the 1180 * same name. Goodbye sticky bit ;-< 1181 */ 1182 if (old_de_ino != OCFS2_I(old_inode)->ip_blkno) { 1183 status = -ENOENT; 1184 goto bail; 1185 } 1186 1187 /* check if the target already exists (in which case we need 1188 * to delete it */ 1189 status = ocfs2_find_files_on_disk(new_dentry->d_name.name, 1190 new_dentry->d_name.len, 1191 &newfe_blkno, new_dir, 1192 &target_lookup_res); 1193 /* The only error we allow here is -ENOENT because the new 1194 * file not existing is perfectly valid. */ 1195 if ((status < 0) && (status != -ENOENT)) { 1196 /* If we cannot find the file specified we should just */ 1197 /* return the error... */ 1198 mlog_errno(status); 1199 goto bail; 1200 } 1201 if (status == 0) 1202 target_exists = 1; 1203 1204 if (!target_exists && new_inode) { 1205 /* 1206 * Target was unlinked by another node while we were 1207 * waiting to get to ocfs2_rename(). There isn't 1208 * anything we can do here to help the situation, so 1209 * bubble up the appropriate error. 1210 */ 1211 status = -ENOENT; 1212 goto bail; 1213 } 1214 1215 /* In case we need to overwrite an existing file, we blow it 1216 * away first */ 1217 if (target_exists) { 1218 /* VFS didn't think there existed an inode here, but 1219 * someone else in the cluster must have raced our 1220 * rename to create one. Today we error cleanly, in 1221 * the future we should consider calling iget to build 1222 * a new struct inode for this entry. */ 1223 if (!new_inode) { 1224 status = -EACCES; 1225 1226 trace_ocfs2_rename_target_exists(new_dentry->d_name.len, 1227 new_dentry->d_name.name); 1228 goto bail; 1229 } 1230 1231 if (OCFS2_I(new_inode)->ip_blkno != newfe_blkno) { 1232 status = -EACCES; 1233 1234 trace_ocfs2_rename_disagree( 1235 (unsigned long long)OCFS2_I(new_inode)->ip_blkno, 1236 (unsigned long long)newfe_blkno, 1237 OCFS2_I(new_inode)->ip_flags); 1238 goto bail; 1239 } 1240 1241 status = ocfs2_inode_lock(new_inode, &newfe_bh, 1); 1242 if (status < 0) { 1243 if (status != -ENOENT) 1244 mlog_errno(status); 1245 goto bail; 1246 } 1247 new_child_locked = 1; 1248 1249 status = ocfs2_remote_dentry_delete(new_dentry); 1250 if (status < 0) { 1251 mlog_errno(status); 1252 goto bail; 1253 } 1254 1255 newfe = (struct ocfs2_dinode *) newfe_bh->b_data; 1256 1257 trace_ocfs2_rename_over_existing( 1258 (unsigned long long)newfe_blkno, newfe_bh, newfe_bh ? 1259 (unsigned long long)newfe_bh->b_blocknr : 0ULL); 1260 1261 if (S_ISDIR(new_inode->i_mode) || (new_inode->i_nlink == 1)) { 1262 status = ocfs2_prepare_orphan_dir(osb, &orphan_dir, 1263 OCFS2_I(new_inode)->ip_blkno, 1264 orphan_name, &orphan_insert); 1265 if (status < 0) { 1266 mlog_errno(status); 1267 goto bail; 1268 } 1269 } 1270 } else { 1271 BUG_ON(new_dentry->d_parent->d_inode != new_dir); 1272 1273 status = ocfs2_check_dir_for_entry(new_dir, 1274 new_dentry->d_name.name, 1275 new_dentry->d_name.len); 1276 if (status) 1277 goto bail; 1278 1279 status = ocfs2_prepare_dir_for_insert(osb, new_dir, new_dir_bh, 1280 new_dentry->d_name.name, 1281 new_dentry->d_name.len, 1282 &target_insert); 1283 if (status < 0) { 1284 mlog_errno(status); 1285 goto bail; 1286 } 1287 } 1288 1289 handle = ocfs2_start_trans(osb, ocfs2_rename_credits(osb->sb)); 1290 if (IS_ERR(handle)) { 1291 status = PTR_ERR(handle); 1292 handle = NULL; 1293 mlog_errno(status); 1294 goto bail; 1295 } 1296 1297 if (target_exists) { 1298 if (S_ISDIR(new_inode->i_mode)) { 1299 if (new_inode->i_nlink != 2 || 1300 !ocfs2_empty_dir(new_inode)) { 1301 status = -ENOTEMPTY; 1302 goto bail; 1303 } 1304 } 1305 status = ocfs2_journal_access_di(handle, INODE_CACHE(new_inode), 1306 newfe_bh, 1307 OCFS2_JOURNAL_ACCESS_WRITE); 1308 if (status < 0) { 1309 mlog_errno(status); 1310 goto bail; 1311 } 1312 1313 if (S_ISDIR(new_inode->i_mode) || 1314 (ocfs2_read_links_count(newfe) == 1)) { 1315 status = ocfs2_orphan_add(osb, handle, new_inode, 1316 newfe_bh, orphan_name, 1317 &orphan_insert, orphan_dir); 1318 if (status < 0) { 1319 mlog_errno(status); 1320 goto bail; 1321 } 1322 } 1323 1324 /* change the dirent to point to the correct inode */ 1325 status = ocfs2_update_entry(new_dir, handle, &target_lookup_res, 1326 old_inode); 1327 if (status < 0) { 1328 mlog_errno(status); 1329 goto bail; 1330 } 1331 new_dir->i_version++; 1332 1333 if (S_ISDIR(new_inode->i_mode)) 1334 ocfs2_set_links_count(newfe, 0); 1335 else 1336 ocfs2_add_links_count(newfe, -1); 1337 ocfs2_journal_dirty(handle, newfe_bh); 1338 } else { 1339 /* if the name was not found in new_dir, add it now */ 1340 status = ocfs2_add_entry(handle, new_dentry, old_inode, 1341 OCFS2_I(old_inode)->ip_blkno, 1342 new_dir_bh, &target_insert); 1343 } 1344 1345 old_inode->i_ctime = CURRENT_TIME; 1346 mark_inode_dirty(old_inode); 1347 1348 status = ocfs2_journal_access_di(handle, INODE_CACHE(old_inode), 1349 old_inode_bh, 1350 OCFS2_JOURNAL_ACCESS_WRITE); 1351 if (status >= 0) { 1352 old_di = (struct ocfs2_dinode *) old_inode_bh->b_data; 1353 1354 old_di->i_ctime = cpu_to_le64(old_inode->i_ctime.tv_sec); 1355 old_di->i_ctime_nsec = cpu_to_le32(old_inode->i_ctime.tv_nsec); 1356 ocfs2_journal_dirty(handle, old_inode_bh); 1357 } else 1358 mlog_errno(status); 1359 1360 /* 1361 * Now that the name has been added to new_dir, remove the old name. 1362 * 1363 * We don't keep any directory entry context around until now 1364 * because the insert might have changed the type of directory 1365 * we're dealing with. 1366 */ 1367 status = ocfs2_find_entry(old_dentry->d_name.name, 1368 old_dentry->d_name.len, old_dir, 1369 &old_entry_lookup); 1370 if (status) 1371 goto bail; 1372 1373 status = ocfs2_delete_entry(handle, old_dir, &old_entry_lookup); 1374 if (status < 0) { 1375 mlog_errno(status); 1376 goto bail; 1377 } 1378 1379 if (new_inode) { 1380 drop_nlink(new_inode); 1381 new_inode->i_ctime = CURRENT_TIME; 1382 } 1383 old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME; 1384 1385 if (update_dot_dot) { 1386 status = ocfs2_update_entry(old_inode, handle, 1387 &old_inode_dot_dot_res, new_dir); 1388 drop_nlink(old_dir); 1389 if (new_inode) { 1390 drop_nlink(new_inode); 1391 } else { 1392 inc_nlink(new_dir); 1393 mark_inode_dirty(new_dir); 1394 } 1395 } 1396 mark_inode_dirty(old_dir); 1397 ocfs2_mark_inode_dirty(handle, old_dir, old_dir_bh); 1398 if (new_inode) { 1399 mark_inode_dirty(new_inode); 1400 ocfs2_mark_inode_dirty(handle, new_inode, newfe_bh); 1401 } 1402 1403 if (old_dir != new_dir) { 1404 /* Keep the same times on both directories.*/ 1405 new_dir->i_ctime = new_dir->i_mtime = old_dir->i_ctime; 1406 1407 /* 1408 * This will also pick up the i_nlink change from the 1409 * block above. 1410 */ 1411 ocfs2_mark_inode_dirty(handle, new_dir, new_dir_bh); 1412 } 1413 1414 if (old_dir_nlink != old_dir->i_nlink) { 1415 if (!old_dir_bh) { 1416 mlog(ML_ERROR, "need to change nlink for old dir " 1417 "%llu from %d to %d but bh is NULL!\n", 1418 (unsigned long long)OCFS2_I(old_dir)->ip_blkno, 1419 (int)old_dir_nlink, old_dir->i_nlink); 1420 } else { 1421 struct ocfs2_dinode *fe; 1422 status = ocfs2_journal_access_di(handle, 1423 INODE_CACHE(old_dir), 1424 old_dir_bh, 1425 OCFS2_JOURNAL_ACCESS_WRITE); 1426 fe = (struct ocfs2_dinode *) old_dir_bh->b_data; 1427 ocfs2_set_links_count(fe, old_dir->i_nlink); 1428 ocfs2_journal_dirty(handle, old_dir_bh); 1429 } 1430 } 1431 ocfs2_dentry_move(old_dentry, new_dentry, old_dir, new_dir); 1432 status = 0; 1433 bail: 1434 if (rename_lock) 1435 ocfs2_rename_unlock(osb); 1436 1437 if (handle) 1438 ocfs2_commit_trans(osb, handle); 1439 1440 if (parents_locked) 1441 ocfs2_double_unlock(old_dir, new_dir); 1442 1443 if (old_child_locked) 1444 ocfs2_inode_unlock(old_inode, 1); 1445 1446 if (new_child_locked) 1447 ocfs2_inode_unlock(new_inode, 1); 1448 1449 if (orphan_dir) { 1450 /* This was locked for us in ocfs2_prepare_orphan_dir() */ 1451 ocfs2_inode_unlock(orphan_dir, 1); 1452 mutex_unlock(&orphan_dir->i_mutex); 1453 iput(orphan_dir); 1454 } 1455 1456 if (new_inode) 1457 sync_mapping_buffers(old_inode->i_mapping); 1458 1459 if (new_inode) 1460 iput(new_inode); 1461 1462 ocfs2_free_dir_lookup_result(&target_lookup_res); 1463 ocfs2_free_dir_lookup_result(&old_entry_lookup); 1464 ocfs2_free_dir_lookup_result(&old_inode_dot_dot_res); 1465 ocfs2_free_dir_lookup_result(&orphan_insert); 1466 ocfs2_free_dir_lookup_result(&target_insert); 1467 1468 brelse(newfe_bh); 1469 brelse(old_inode_bh); 1470 brelse(old_dir_bh); 1471 brelse(new_dir_bh); 1472 1473 if (status) 1474 mlog_errno(status); 1475 1476 return status; 1477 } 1478 1479 /* 1480 * we expect i_size = strlen(symname). Copy symname into the file 1481 * data, including the null terminator. 1482 */ 1483 static int ocfs2_create_symlink_data(struct ocfs2_super *osb, 1484 handle_t *handle, 1485 struct inode *inode, 1486 const char *symname) 1487 { 1488 struct buffer_head **bhs = NULL; 1489 const char *c; 1490 struct super_block *sb = osb->sb; 1491 u64 p_blkno, p_blocks; 1492 int virtual, blocks, status, i, bytes_left; 1493 1494 bytes_left = i_size_read(inode) + 1; 1495 /* we can't trust i_blocks because we're actually going to 1496 * write i_size + 1 bytes. */ 1497 blocks = (bytes_left + sb->s_blocksize - 1) >> sb->s_blocksize_bits; 1498 1499 trace_ocfs2_create_symlink_data((unsigned long long)inode->i_blocks, 1500 i_size_read(inode), blocks); 1501 1502 /* Sanity check -- make sure we're going to fit. */ 1503 if (bytes_left > 1504 ocfs2_clusters_to_bytes(sb, OCFS2_I(inode)->ip_clusters)) { 1505 status = -EIO; 1506 mlog_errno(status); 1507 goto bail; 1508 } 1509 1510 bhs = kcalloc(blocks, sizeof(struct buffer_head *), GFP_KERNEL); 1511 if (!bhs) { 1512 status = -ENOMEM; 1513 mlog_errno(status); 1514 goto bail; 1515 } 1516 1517 status = ocfs2_extent_map_get_blocks(inode, 0, &p_blkno, &p_blocks, 1518 NULL); 1519 if (status < 0) { 1520 mlog_errno(status); 1521 goto bail; 1522 } 1523 1524 /* links can never be larger than one cluster so we know this 1525 * is all going to be contiguous, but do a sanity check 1526 * anyway. */ 1527 if ((p_blocks << sb->s_blocksize_bits) < bytes_left) { 1528 status = -EIO; 1529 mlog_errno(status); 1530 goto bail; 1531 } 1532 1533 virtual = 0; 1534 while(bytes_left > 0) { 1535 c = &symname[virtual * sb->s_blocksize]; 1536 1537 bhs[virtual] = sb_getblk(sb, p_blkno); 1538 if (!bhs[virtual]) { 1539 status = -ENOMEM; 1540 mlog_errno(status); 1541 goto bail; 1542 } 1543 ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), 1544 bhs[virtual]); 1545 1546 status = ocfs2_journal_access(handle, INODE_CACHE(inode), 1547 bhs[virtual], 1548 OCFS2_JOURNAL_ACCESS_CREATE); 1549 if (status < 0) { 1550 mlog_errno(status); 1551 goto bail; 1552 } 1553 1554 memset(bhs[virtual]->b_data, 0, sb->s_blocksize); 1555 1556 memcpy(bhs[virtual]->b_data, c, 1557 (bytes_left > sb->s_blocksize) ? sb->s_blocksize : 1558 bytes_left); 1559 1560 ocfs2_journal_dirty(handle, bhs[virtual]); 1561 1562 virtual++; 1563 p_blkno++; 1564 bytes_left -= sb->s_blocksize; 1565 } 1566 1567 status = 0; 1568 bail: 1569 1570 if (bhs) { 1571 for(i = 0; i < blocks; i++) 1572 brelse(bhs[i]); 1573 kfree(bhs); 1574 } 1575 1576 if (status) 1577 mlog_errno(status); 1578 return status; 1579 } 1580 1581 static int ocfs2_symlink(struct inode *dir, 1582 struct dentry *dentry, 1583 const char *symname) 1584 { 1585 int status, l, credits; 1586 u64 newsize; 1587 struct ocfs2_super *osb = NULL; 1588 struct inode *inode = NULL; 1589 struct super_block *sb; 1590 struct buffer_head *new_fe_bh = NULL; 1591 struct buffer_head *parent_fe_bh = NULL; 1592 struct ocfs2_dinode *fe = NULL; 1593 struct ocfs2_dinode *dirfe; 1594 handle_t *handle = NULL; 1595 struct ocfs2_alloc_context *inode_ac = NULL; 1596 struct ocfs2_alloc_context *data_ac = NULL; 1597 struct ocfs2_alloc_context *xattr_ac = NULL; 1598 int want_clusters = 0; 1599 int xattr_credits = 0; 1600 struct ocfs2_security_xattr_info si = { 1601 .enable = 1, 1602 }; 1603 int did_quota = 0, did_quota_inode = 0; 1604 struct ocfs2_dir_lookup_result lookup = { NULL, }; 1605 sigset_t oldset; 1606 int did_block_signals = 0; 1607 1608 trace_ocfs2_symlink_begin(dir, dentry, symname, 1609 dentry->d_name.len, dentry->d_name.name); 1610 1611 dquot_initialize(dir); 1612 1613 sb = dir->i_sb; 1614 osb = OCFS2_SB(sb); 1615 1616 l = strlen(symname) + 1; 1617 1618 credits = ocfs2_calc_symlink_credits(sb); 1619 1620 /* lock the parent directory */ 1621 status = ocfs2_inode_lock(dir, &parent_fe_bh, 1); 1622 if (status < 0) { 1623 if (status != -ENOENT) 1624 mlog_errno(status); 1625 return status; 1626 } 1627 1628 dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data; 1629 if (!ocfs2_read_links_count(dirfe)) { 1630 /* can't make a file in a deleted directory. */ 1631 status = -ENOENT; 1632 goto bail; 1633 } 1634 1635 status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name, 1636 dentry->d_name.len); 1637 if (status) 1638 goto bail; 1639 1640 status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh, 1641 dentry->d_name.name, 1642 dentry->d_name.len, &lookup); 1643 if (status < 0) { 1644 mlog_errno(status); 1645 goto bail; 1646 } 1647 1648 status = ocfs2_reserve_new_inode(osb, &inode_ac); 1649 if (status < 0) { 1650 if (status != -ENOSPC) 1651 mlog_errno(status); 1652 goto bail; 1653 } 1654 1655 inode = ocfs2_get_init_inode(dir, S_IFLNK | S_IRWXUGO); 1656 if (!inode) { 1657 status = -ENOMEM; 1658 mlog_errno(status); 1659 goto bail; 1660 } 1661 1662 /* get security xattr */ 1663 status = ocfs2_init_security_get(inode, dir, &dentry->d_name, &si); 1664 if (status) { 1665 if (status == -EOPNOTSUPP) 1666 si.enable = 0; 1667 else { 1668 mlog_errno(status); 1669 goto bail; 1670 } 1671 } 1672 1673 /* calculate meta data/clusters for setting security xattr */ 1674 if (si.enable) { 1675 status = ocfs2_calc_security_init(dir, &si, &want_clusters, 1676 &xattr_credits, &xattr_ac); 1677 if (status < 0) { 1678 mlog_errno(status); 1679 goto bail; 1680 } 1681 } 1682 1683 /* don't reserve bitmap space for fast symlinks. */ 1684 if (l > ocfs2_fast_symlink_chars(sb)) 1685 want_clusters += 1; 1686 1687 status = ocfs2_reserve_clusters(osb, want_clusters, &data_ac); 1688 if (status < 0) { 1689 if (status != -ENOSPC) 1690 mlog_errno(status); 1691 goto bail; 1692 } 1693 1694 handle = ocfs2_start_trans(osb, credits + xattr_credits); 1695 if (IS_ERR(handle)) { 1696 status = PTR_ERR(handle); 1697 handle = NULL; 1698 mlog_errno(status); 1699 goto bail; 1700 } 1701 1702 /* Starting to change things, restart is no longer possible. */ 1703 ocfs2_block_signals(&oldset); 1704 did_block_signals = 1; 1705 1706 status = dquot_alloc_inode(inode); 1707 if (status) 1708 goto bail; 1709 did_quota_inode = 1; 1710 1711 trace_ocfs2_symlink_create(dir, dentry, dentry->d_name.len, 1712 dentry->d_name.name, 1713 (unsigned long long)OCFS2_I(dir)->ip_blkno, 1714 inode->i_mode); 1715 1716 status = ocfs2_mknod_locked(osb, dir, inode, 1717 0, &new_fe_bh, parent_fe_bh, handle, 1718 inode_ac); 1719 if (status < 0) { 1720 mlog_errno(status); 1721 goto bail; 1722 } 1723 1724 fe = (struct ocfs2_dinode *) new_fe_bh->b_data; 1725 inode->i_rdev = 0; 1726 newsize = l - 1; 1727 if (l > ocfs2_fast_symlink_chars(sb)) { 1728 u32 offset = 0; 1729 1730 inode->i_op = &ocfs2_symlink_inode_operations; 1731 status = dquot_alloc_space_nodirty(inode, 1732 ocfs2_clusters_to_bytes(osb->sb, 1)); 1733 if (status) 1734 goto bail; 1735 did_quota = 1; 1736 status = ocfs2_add_inode_data(osb, inode, &offset, 1, 0, 1737 new_fe_bh, 1738 handle, data_ac, NULL, 1739 NULL); 1740 if (status < 0) { 1741 if (status != -ENOSPC && status != -EINTR) { 1742 mlog(ML_ERROR, 1743 "Failed to extend file to %llu\n", 1744 (unsigned long long)newsize); 1745 mlog_errno(status); 1746 status = -ENOSPC; 1747 } 1748 goto bail; 1749 } 1750 i_size_write(inode, newsize); 1751 inode->i_blocks = ocfs2_inode_sector_count(inode); 1752 } else { 1753 inode->i_op = &ocfs2_fast_symlink_inode_operations; 1754 memcpy((char *) fe->id2.i_symlink, symname, l); 1755 i_size_write(inode, newsize); 1756 inode->i_blocks = 0; 1757 } 1758 1759 status = ocfs2_mark_inode_dirty(handle, inode, new_fe_bh); 1760 if (status < 0) { 1761 mlog_errno(status); 1762 goto bail; 1763 } 1764 1765 if (!ocfs2_inode_is_fast_symlink(inode)) { 1766 status = ocfs2_create_symlink_data(osb, handle, inode, 1767 symname); 1768 if (status < 0) { 1769 mlog_errno(status); 1770 goto bail; 1771 } 1772 } 1773 1774 if (si.enable) { 1775 status = ocfs2_init_security_set(handle, inode, new_fe_bh, &si, 1776 xattr_ac, data_ac); 1777 if (status < 0) { 1778 mlog_errno(status); 1779 goto bail; 1780 } 1781 } 1782 1783 /* 1784 * Do this before adding the entry to the directory. We add 1785 * also set d_op after success so that ->d_iput() will cleanup 1786 * the dentry lock even if ocfs2_add_entry() fails below. 1787 */ 1788 status = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno); 1789 if (status) { 1790 mlog_errno(status); 1791 goto bail; 1792 } 1793 1794 status = ocfs2_add_entry(handle, dentry, inode, 1795 le64_to_cpu(fe->i_blkno), parent_fe_bh, 1796 &lookup); 1797 if (status < 0) { 1798 mlog_errno(status); 1799 goto bail; 1800 } 1801 1802 insert_inode_hash(inode); 1803 d_instantiate(dentry, inode); 1804 bail: 1805 if (status < 0 && did_quota) 1806 dquot_free_space_nodirty(inode, 1807 ocfs2_clusters_to_bytes(osb->sb, 1)); 1808 if (status < 0 && did_quota_inode) 1809 dquot_free_inode(inode); 1810 if (handle) 1811 ocfs2_commit_trans(osb, handle); 1812 1813 ocfs2_inode_unlock(dir, 1); 1814 if (did_block_signals) 1815 ocfs2_unblock_signals(&oldset); 1816 1817 brelse(new_fe_bh); 1818 brelse(parent_fe_bh); 1819 kfree(si.name); 1820 kfree(si.value); 1821 ocfs2_free_dir_lookup_result(&lookup); 1822 if (inode_ac) 1823 ocfs2_free_alloc_context(inode_ac); 1824 if (data_ac) 1825 ocfs2_free_alloc_context(data_ac); 1826 if (xattr_ac) 1827 ocfs2_free_alloc_context(xattr_ac); 1828 if ((status < 0) && inode) { 1829 OCFS2_I(inode)->ip_flags |= OCFS2_INODE_SKIP_ORPHAN_DIR; 1830 clear_nlink(inode); 1831 iput(inode); 1832 } 1833 1834 if (status) 1835 mlog_errno(status); 1836 1837 return status; 1838 } 1839 1840 static int ocfs2_blkno_stringify(u64 blkno, char *name) 1841 { 1842 int status, namelen; 1843 1844 namelen = snprintf(name, OCFS2_ORPHAN_NAMELEN + 1, "%016llx", 1845 (long long)blkno); 1846 if (namelen <= 0) { 1847 if (namelen) 1848 status = namelen; 1849 else 1850 status = -EINVAL; 1851 mlog_errno(status); 1852 goto bail; 1853 } 1854 if (namelen != OCFS2_ORPHAN_NAMELEN) { 1855 status = -EINVAL; 1856 mlog_errno(status); 1857 goto bail; 1858 } 1859 1860 trace_ocfs2_blkno_stringify(blkno, name, namelen); 1861 1862 status = 0; 1863 bail: 1864 if (status < 0) 1865 mlog_errno(status); 1866 return status; 1867 } 1868 1869 static int ocfs2_lookup_lock_orphan_dir(struct ocfs2_super *osb, 1870 struct inode **ret_orphan_dir, 1871 struct buffer_head **ret_orphan_dir_bh) 1872 { 1873 struct inode *orphan_dir_inode; 1874 struct buffer_head *orphan_dir_bh = NULL; 1875 int ret = 0; 1876 1877 orphan_dir_inode = ocfs2_get_system_file_inode(osb, 1878 ORPHAN_DIR_SYSTEM_INODE, 1879 osb->slot_num); 1880 if (!orphan_dir_inode) { 1881 ret = -ENOENT; 1882 mlog_errno(ret); 1883 return ret; 1884 } 1885 1886 mutex_lock(&orphan_dir_inode->i_mutex); 1887 1888 ret = ocfs2_inode_lock(orphan_dir_inode, &orphan_dir_bh, 1); 1889 if (ret < 0) { 1890 mutex_unlock(&orphan_dir_inode->i_mutex); 1891 iput(orphan_dir_inode); 1892 1893 mlog_errno(ret); 1894 return ret; 1895 } 1896 1897 *ret_orphan_dir = orphan_dir_inode; 1898 *ret_orphan_dir_bh = orphan_dir_bh; 1899 1900 return 0; 1901 } 1902 1903 static int __ocfs2_prepare_orphan_dir(struct inode *orphan_dir_inode, 1904 struct buffer_head *orphan_dir_bh, 1905 u64 blkno, 1906 char *name, 1907 struct ocfs2_dir_lookup_result *lookup) 1908 { 1909 int ret; 1910 struct ocfs2_super *osb = OCFS2_SB(orphan_dir_inode->i_sb); 1911 1912 ret = ocfs2_blkno_stringify(blkno, name); 1913 if (ret < 0) { 1914 mlog_errno(ret); 1915 return ret; 1916 } 1917 1918 ret = ocfs2_prepare_dir_for_insert(osb, orphan_dir_inode, 1919 orphan_dir_bh, name, 1920 OCFS2_ORPHAN_NAMELEN, lookup); 1921 if (ret < 0) { 1922 mlog_errno(ret); 1923 return ret; 1924 } 1925 1926 return 0; 1927 } 1928 1929 /** 1930 * ocfs2_prepare_orphan_dir() - Prepare an orphan directory for 1931 * insertion of an orphan. 1932 * @osb: ocfs2 file system 1933 * @ret_orphan_dir: Orphan dir inode - returned locked! 1934 * @blkno: Actual block number of the inode to be inserted into orphan dir. 1935 * @lookup: dir lookup result, to be passed back into functions like 1936 * ocfs2_orphan_add 1937 * 1938 * Returns zero on success and the ret_orphan_dir, name and lookup 1939 * fields will be populated. 1940 * 1941 * Returns non-zero on failure. 1942 */ 1943 static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb, 1944 struct inode **ret_orphan_dir, 1945 u64 blkno, 1946 char *name, 1947 struct ocfs2_dir_lookup_result *lookup) 1948 { 1949 struct inode *orphan_dir_inode = NULL; 1950 struct buffer_head *orphan_dir_bh = NULL; 1951 int ret = 0; 1952 1953 ret = ocfs2_lookup_lock_orphan_dir(osb, &orphan_dir_inode, 1954 &orphan_dir_bh); 1955 if (ret < 0) { 1956 mlog_errno(ret); 1957 return ret; 1958 } 1959 1960 ret = __ocfs2_prepare_orphan_dir(orphan_dir_inode, orphan_dir_bh, 1961 blkno, name, lookup); 1962 if (ret < 0) { 1963 mlog_errno(ret); 1964 goto out; 1965 } 1966 1967 *ret_orphan_dir = orphan_dir_inode; 1968 1969 out: 1970 brelse(orphan_dir_bh); 1971 1972 if (ret) { 1973 ocfs2_inode_unlock(orphan_dir_inode, 1); 1974 mutex_unlock(&orphan_dir_inode->i_mutex); 1975 iput(orphan_dir_inode); 1976 } 1977 1978 if (ret) 1979 mlog_errno(ret); 1980 return ret; 1981 } 1982 1983 static int ocfs2_orphan_add(struct ocfs2_super *osb, 1984 handle_t *handle, 1985 struct inode *inode, 1986 struct buffer_head *fe_bh, 1987 char *name, 1988 struct ocfs2_dir_lookup_result *lookup, 1989 struct inode *orphan_dir_inode) 1990 { 1991 struct buffer_head *orphan_dir_bh = NULL; 1992 int status = 0; 1993 struct ocfs2_dinode *orphan_fe; 1994 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) fe_bh->b_data; 1995 1996 trace_ocfs2_orphan_add_begin( 1997 (unsigned long long)OCFS2_I(inode)->ip_blkno); 1998 1999 status = ocfs2_read_inode_block(orphan_dir_inode, &orphan_dir_bh); 2000 if (status < 0) { 2001 mlog_errno(status); 2002 goto leave; 2003 } 2004 2005 status = ocfs2_journal_access_di(handle, 2006 INODE_CACHE(orphan_dir_inode), 2007 orphan_dir_bh, 2008 OCFS2_JOURNAL_ACCESS_WRITE); 2009 if (status < 0) { 2010 mlog_errno(status); 2011 goto leave; 2012 } 2013 2014 /* we're a cluster, and nlink can change on disk from 2015 * underneath us... */ 2016 orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data; 2017 if (S_ISDIR(inode->i_mode)) 2018 ocfs2_add_links_count(orphan_fe, 1); 2019 set_nlink(orphan_dir_inode, ocfs2_read_links_count(orphan_fe)); 2020 ocfs2_journal_dirty(handle, orphan_dir_bh); 2021 2022 status = __ocfs2_add_entry(handle, orphan_dir_inode, name, 2023 OCFS2_ORPHAN_NAMELEN, inode, 2024 OCFS2_I(inode)->ip_blkno, 2025 orphan_dir_bh, lookup); 2026 if (status < 0) { 2027 mlog_errno(status); 2028 goto leave; 2029 } 2030 2031 /* 2032 * We're going to journal the change of i_flags and i_orphaned_slot. 2033 * It's safe anyway, though some callers may duplicate the journaling. 2034 * Journaling within the func just make the logic look more 2035 * straightforward. 2036 */ 2037 status = ocfs2_journal_access_di(handle, 2038 INODE_CACHE(inode), 2039 fe_bh, 2040 OCFS2_JOURNAL_ACCESS_WRITE); 2041 if (status < 0) { 2042 mlog_errno(status); 2043 goto leave; 2044 } 2045 2046 le32_add_cpu(&fe->i_flags, OCFS2_ORPHANED_FL); 2047 OCFS2_I(inode)->ip_flags &= ~OCFS2_INODE_SKIP_ORPHAN_DIR; 2048 2049 /* Record which orphan dir our inode now resides 2050 * in. delete_inode will use this to determine which orphan 2051 * dir to lock. */ 2052 fe->i_orphaned_slot = cpu_to_le16(osb->slot_num); 2053 2054 ocfs2_journal_dirty(handle, fe_bh); 2055 2056 trace_ocfs2_orphan_add_end((unsigned long long)OCFS2_I(inode)->ip_blkno, 2057 osb->slot_num); 2058 2059 leave: 2060 brelse(orphan_dir_bh); 2061 2062 if (status) 2063 mlog_errno(status); 2064 return status; 2065 } 2066 2067 /* unlike orphan_add, we expect the orphan dir to already be locked here. */ 2068 int ocfs2_orphan_del(struct ocfs2_super *osb, 2069 handle_t *handle, 2070 struct inode *orphan_dir_inode, 2071 struct inode *inode, 2072 struct buffer_head *orphan_dir_bh) 2073 { 2074 char name[OCFS2_ORPHAN_NAMELEN + 1]; 2075 struct ocfs2_dinode *orphan_fe; 2076 int status = 0; 2077 struct ocfs2_dir_lookup_result lookup = { NULL, }; 2078 2079 status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name); 2080 if (status < 0) { 2081 mlog_errno(status); 2082 goto leave; 2083 } 2084 2085 trace_ocfs2_orphan_del( 2086 (unsigned long long)OCFS2_I(orphan_dir_inode)->ip_blkno, 2087 name, OCFS2_ORPHAN_NAMELEN); 2088 2089 /* find it's spot in the orphan directory */ 2090 status = ocfs2_find_entry(name, OCFS2_ORPHAN_NAMELEN, orphan_dir_inode, 2091 &lookup); 2092 if (status) { 2093 mlog_errno(status); 2094 goto leave; 2095 } 2096 2097 /* remove it from the orphan directory */ 2098 status = ocfs2_delete_entry(handle, orphan_dir_inode, &lookup); 2099 if (status < 0) { 2100 mlog_errno(status); 2101 goto leave; 2102 } 2103 2104 status = ocfs2_journal_access_di(handle, 2105 INODE_CACHE(orphan_dir_inode), 2106 orphan_dir_bh, 2107 OCFS2_JOURNAL_ACCESS_WRITE); 2108 if (status < 0) { 2109 mlog_errno(status); 2110 goto leave; 2111 } 2112 2113 /* do the i_nlink dance! :) */ 2114 orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data; 2115 if (S_ISDIR(inode->i_mode)) 2116 ocfs2_add_links_count(orphan_fe, -1); 2117 set_nlink(orphan_dir_inode, ocfs2_read_links_count(orphan_fe)); 2118 ocfs2_journal_dirty(handle, orphan_dir_bh); 2119 2120 leave: 2121 ocfs2_free_dir_lookup_result(&lookup); 2122 2123 if (status) 2124 mlog_errno(status); 2125 return status; 2126 } 2127 2128 /** 2129 * ocfs2_prep_new_orphaned_file() - Prepare the orphan dir to receive a newly 2130 * allocated file. This is different from the typical 'add to orphan dir' 2131 * operation in that the inode does not yet exist. This is a problem because 2132 * the orphan dir stringifies the inode block number to come up with it's 2133 * dirent. Obviously if the inode does not yet exist we have a chicken and egg 2134 * problem. This function works around it by calling deeper into the orphan 2135 * and suballoc code than other callers. Use this only by necessity. 2136 * @dir: The directory which this inode will ultimately wind up under - not the 2137 * orphan dir! 2138 * @dir_bh: buffer_head the @dir inode block 2139 * @orphan_name: string of length (CFS2_ORPHAN_NAMELEN + 1). Will be filled 2140 * with the string to be used for orphan dirent. Pass back to the orphan dir 2141 * code. 2142 * @ret_orphan_dir: orphan dir inode returned to be passed back into orphan 2143 * dir code. 2144 * @ret_di_blkno: block number where the new inode will be allocated. 2145 * @orphan_insert: Dir insert context to be passed back into orphan dir code. 2146 * @ret_inode_ac: Inode alloc context to be passed back to the allocator. 2147 * 2148 * Returns zero on success and the ret_orphan_dir, name and lookup 2149 * fields will be populated. 2150 * 2151 * Returns non-zero on failure. 2152 */ 2153 static int ocfs2_prep_new_orphaned_file(struct inode *dir, 2154 struct buffer_head *dir_bh, 2155 char *orphan_name, 2156 struct inode **ret_orphan_dir, 2157 u64 *ret_di_blkno, 2158 struct ocfs2_dir_lookup_result *orphan_insert, 2159 struct ocfs2_alloc_context **ret_inode_ac) 2160 { 2161 int ret; 2162 u64 di_blkno; 2163 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb); 2164 struct inode *orphan_dir = NULL; 2165 struct buffer_head *orphan_dir_bh = NULL; 2166 struct ocfs2_alloc_context *inode_ac = NULL; 2167 2168 ret = ocfs2_lookup_lock_orphan_dir(osb, &orphan_dir, &orphan_dir_bh); 2169 if (ret < 0) { 2170 mlog_errno(ret); 2171 return ret; 2172 } 2173 2174 /* reserve an inode spot */ 2175 ret = ocfs2_reserve_new_inode(osb, &inode_ac); 2176 if (ret < 0) { 2177 if (ret != -ENOSPC) 2178 mlog_errno(ret); 2179 goto out; 2180 } 2181 2182 ret = ocfs2_find_new_inode_loc(dir, dir_bh, inode_ac, 2183 &di_blkno); 2184 if (ret) { 2185 mlog_errno(ret); 2186 goto out; 2187 } 2188 2189 ret = __ocfs2_prepare_orphan_dir(orphan_dir, orphan_dir_bh, 2190 di_blkno, orphan_name, orphan_insert); 2191 if (ret < 0) { 2192 mlog_errno(ret); 2193 goto out; 2194 } 2195 2196 out: 2197 if (ret == 0) { 2198 *ret_orphan_dir = orphan_dir; 2199 *ret_di_blkno = di_blkno; 2200 *ret_inode_ac = inode_ac; 2201 /* 2202 * orphan_name and orphan_insert are already up to 2203 * date via prepare_orphan_dir 2204 */ 2205 } else { 2206 /* Unroll reserve_new_inode* */ 2207 if (inode_ac) 2208 ocfs2_free_alloc_context(inode_ac); 2209 2210 /* Unroll orphan dir locking */ 2211 mutex_unlock(&orphan_dir->i_mutex); 2212 ocfs2_inode_unlock(orphan_dir, 1); 2213 iput(orphan_dir); 2214 } 2215 2216 brelse(orphan_dir_bh); 2217 2218 return 0; 2219 } 2220 2221 int ocfs2_create_inode_in_orphan(struct inode *dir, 2222 int mode, 2223 struct inode **new_inode) 2224 { 2225 int status, did_quota_inode = 0; 2226 struct inode *inode = NULL; 2227 struct inode *orphan_dir = NULL; 2228 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb); 2229 struct ocfs2_dinode *di = NULL; 2230 handle_t *handle = NULL; 2231 char orphan_name[OCFS2_ORPHAN_NAMELEN + 1]; 2232 struct buffer_head *parent_di_bh = NULL; 2233 struct buffer_head *new_di_bh = NULL; 2234 struct ocfs2_alloc_context *inode_ac = NULL; 2235 struct ocfs2_dir_lookup_result orphan_insert = { NULL, }; 2236 u64 uninitialized_var(di_blkno), suballoc_loc; 2237 u16 suballoc_bit; 2238 2239 status = ocfs2_inode_lock(dir, &parent_di_bh, 1); 2240 if (status < 0) { 2241 if (status != -ENOENT) 2242 mlog_errno(status); 2243 return status; 2244 } 2245 2246 status = ocfs2_prep_new_orphaned_file(dir, parent_di_bh, 2247 orphan_name, &orphan_dir, 2248 &di_blkno, &orphan_insert, &inode_ac); 2249 if (status < 0) { 2250 if (status != -ENOSPC) 2251 mlog_errno(status); 2252 goto leave; 2253 } 2254 2255 inode = ocfs2_get_init_inode(dir, mode); 2256 if (!inode) { 2257 status = -ENOMEM; 2258 mlog_errno(status); 2259 goto leave; 2260 } 2261 2262 handle = ocfs2_start_trans(osb, ocfs2_mknod_credits(osb->sb, 0, 0)); 2263 if (IS_ERR(handle)) { 2264 status = PTR_ERR(handle); 2265 handle = NULL; 2266 mlog_errno(status); 2267 goto leave; 2268 } 2269 2270 status = dquot_alloc_inode(inode); 2271 if (status) 2272 goto leave; 2273 did_quota_inode = 1; 2274 2275 status = ocfs2_claim_new_inode_at_loc(handle, dir, inode_ac, 2276 &suballoc_loc, 2277 &suballoc_bit, di_blkno); 2278 if (status < 0) { 2279 mlog_errno(status); 2280 goto leave; 2281 } 2282 2283 clear_nlink(inode); 2284 /* do the real work now. */ 2285 status = __ocfs2_mknod_locked(dir, inode, 2286 0, &new_di_bh, parent_di_bh, handle, 2287 inode_ac, di_blkno, suballoc_loc, 2288 suballoc_bit); 2289 if (status < 0) { 2290 mlog_errno(status); 2291 goto leave; 2292 } 2293 2294 di = (struct ocfs2_dinode *)new_di_bh->b_data; 2295 status = ocfs2_orphan_add(osb, handle, inode, new_di_bh, orphan_name, 2296 &orphan_insert, orphan_dir); 2297 if (status < 0) { 2298 mlog_errno(status); 2299 goto leave; 2300 } 2301 2302 /* get open lock so that only nodes can't remove it from orphan dir. */ 2303 status = ocfs2_open_lock(inode); 2304 if (status < 0) 2305 mlog_errno(status); 2306 2307 insert_inode_hash(inode); 2308 leave: 2309 if (status < 0 && did_quota_inode) 2310 dquot_free_inode(inode); 2311 if (handle) 2312 ocfs2_commit_trans(osb, handle); 2313 2314 if (orphan_dir) { 2315 /* This was locked for us in ocfs2_prepare_orphan_dir() */ 2316 ocfs2_inode_unlock(orphan_dir, 1); 2317 mutex_unlock(&orphan_dir->i_mutex); 2318 iput(orphan_dir); 2319 } 2320 2321 if ((status < 0) && inode) { 2322 clear_nlink(inode); 2323 iput(inode); 2324 } 2325 2326 if (inode_ac) 2327 ocfs2_free_alloc_context(inode_ac); 2328 2329 brelse(new_di_bh); 2330 2331 if (!status) 2332 *new_inode = inode; 2333 2334 ocfs2_free_dir_lookup_result(&orphan_insert); 2335 2336 ocfs2_inode_unlock(dir, 1); 2337 brelse(parent_di_bh); 2338 return status; 2339 } 2340 2341 int ocfs2_mv_orphaned_inode_to_new(struct inode *dir, 2342 struct inode *inode, 2343 struct dentry *dentry) 2344 { 2345 int status = 0; 2346 struct buffer_head *parent_di_bh = NULL; 2347 handle_t *handle = NULL; 2348 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb); 2349 struct ocfs2_dinode *dir_di, *di; 2350 struct inode *orphan_dir_inode = NULL; 2351 struct buffer_head *orphan_dir_bh = NULL; 2352 struct buffer_head *di_bh = NULL; 2353 struct ocfs2_dir_lookup_result lookup = { NULL, }; 2354 2355 trace_ocfs2_mv_orphaned_inode_to_new(dir, dentry, 2356 dentry->d_name.len, dentry->d_name.name, 2357 (unsigned long long)OCFS2_I(dir)->ip_blkno, 2358 (unsigned long long)OCFS2_I(inode)->ip_blkno); 2359 2360 status = ocfs2_inode_lock(dir, &parent_di_bh, 1); 2361 if (status < 0) { 2362 if (status != -ENOENT) 2363 mlog_errno(status); 2364 return status; 2365 } 2366 2367 dir_di = (struct ocfs2_dinode *) parent_di_bh->b_data; 2368 if (!dir_di->i_links_count) { 2369 /* can't make a file in a deleted directory. */ 2370 status = -ENOENT; 2371 goto leave; 2372 } 2373 2374 status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name, 2375 dentry->d_name.len); 2376 if (status) 2377 goto leave; 2378 2379 /* get a spot inside the dir. */ 2380 status = ocfs2_prepare_dir_for_insert(osb, dir, parent_di_bh, 2381 dentry->d_name.name, 2382 dentry->d_name.len, &lookup); 2383 if (status < 0) { 2384 mlog_errno(status); 2385 goto leave; 2386 } 2387 2388 orphan_dir_inode = ocfs2_get_system_file_inode(osb, 2389 ORPHAN_DIR_SYSTEM_INODE, 2390 osb->slot_num); 2391 if (!orphan_dir_inode) { 2392 status = -EEXIST; 2393 mlog_errno(status); 2394 goto leave; 2395 } 2396 2397 mutex_lock(&orphan_dir_inode->i_mutex); 2398 2399 status = ocfs2_inode_lock(orphan_dir_inode, &orphan_dir_bh, 1); 2400 if (status < 0) { 2401 mlog_errno(status); 2402 mutex_unlock(&orphan_dir_inode->i_mutex); 2403 iput(orphan_dir_inode); 2404 goto leave; 2405 } 2406 2407 status = ocfs2_read_inode_block(inode, &di_bh); 2408 if (status < 0) { 2409 mlog_errno(status); 2410 goto orphan_unlock; 2411 } 2412 2413 handle = ocfs2_start_trans(osb, ocfs2_rename_credits(osb->sb)); 2414 if (IS_ERR(handle)) { 2415 status = PTR_ERR(handle); 2416 handle = NULL; 2417 mlog_errno(status); 2418 goto orphan_unlock; 2419 } 2420 2421 status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), 2422 di_bh, OCFS2_JOURNAL_ACCESS_WRITE); 2423 if (status < 0) { 2424 mlog_errno(status); 2425 goto out_commit; 2426 } 2427 2428 status = ocfs2_orphan_del(osb, handle, orphan_dir_inode, inode, 2429 orphan_dir_bh); 2430 if (status < 0) { 2431 mlog_errno(status); 2432 goto out_commit; 2433 } 2434 2435 di = (struct ocfs2_dinode *)di_bh->b_data; 2436 le32_add_cpu(&di->i_flags, -OCFS2_ORPHANED_FL); 2437 di->i_orphaned_slot = 0; 2438 set_nlink(inode, 1); 2439 ocfs2_set_links_count(di, inode->i_nlink); 2440 ocfs2_journal_dirty(handle, di_bh); 2441 2442 status = ocfs2_add_entry(handle, dentry, inode, 2443 OCFS2_I(inode)->ip_blkno, parent_di_bh, 2444 &lookup); 2445 if (status < 0) { 2446 mlog_errno(status); 2447 goto out_commit; 2448 } 2449 2450 status = ocfs2_dentry_attach_lock(dentry, inode, 2451 OCFS2_I(dir)->ip_blkno); 2452 if (status) { 2453 mlog_errno(status); 2454 goto out_commit; 2455 } 2456 2457 d_instantiate(dentry, inode); 2458 status = 0; 2459 out_commit: 2460 ocfs2_commit_trans(osb, handle); 2461 orphan_unlock: 2462 ocfs2_inode_unlock(orphan_dir_inode, 1); 2463 mutex_unlock(&orphan_dir_inode->i_mutex); 2464 iput(orphan_dir_inode); 2465 leave: 2466 2467 ocfs2_inode_unlock(dir, 1); 2468 2469 brelse(di_bh); 2470 brelse(parent_di_bh); 2471 brelse(orphan_dir_bh); 2472 2473 ocfs2_free_dir_lookup_result(&lookup); 2474 2475 if (status) 2476 mlog_errno(status); 2477 2478 return status; 2479 } 2480 2481 const struct inode_operations ocfs2_dir_iops = { 2482 .create = ocfs2_create, 2483 .lookup = ocfs2_lookup, 2484 .link = ocfs2_link, 2485 .unlink = ocfs2_unlink, 2486 .rmdir = ocfs2_unlink, 2487 .symlink = ocfs2_symlink, 2488 .mkdir = ocfs2_mkdir, 2489 .mknod = ocfs2_mknod, 2490 .rename = ocfs2_rename, 2491 .setattr = ocfs2_setattr, 2492 .getattr = ocfs2_getattr, 2493 .permission = ocfs2_permission, 2494 .setxattr = generic_setxattr, 2495 .getxattr = generic_getxattr, 2496 .listxattr = ocfs2_listxattr, 2497 .removexattr = generic_removexattr, 2498 .fiemap = ocfs2_fiemap, 2499 .get_acl = ocfs2_iop_get_acl, 2500 }; 2501