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 44 #define MLOG_MASK_PREFIX ML_NAMEI 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 "vote.h" 64 65 #include "buffer_head_io.h" 66 67 #define NAMEI_RA_CHUNKS 2 68 #define NAMEI_RA_BLOCKS 4 69 #define NAMEI_RA_SIZE (NAMEI_RA_CHUNKS * NAMEI_RA_BLOCKS) 70 #define NAMEI_RA_INDEX(c,b) (((c) * NAMEI_RA_BLOCKS) + (b)) 71 72 static int inline ocfs2_search_dirblock(struct buffer_head *bh, 73 struct inode *dir, 74 const char *name, int namelen, 75 unsigned long offset, 76 struct ocfs2_dir_entry **res_dir); 77 78 static int ocfs2_delete_entry(handle_t *handle, 79 struct inode *dir, 80 struct ocfs2_dir_entry *de_del, 81 struct buffer_head *bh); 82 83 static int __ocfs2_add_entry(handle_t *handle, 84 struct inode *dir, 85 const char *name, int namelen, 86 struct inode *inode, u64 blkno, 87 struct buffer_head *parent_fe_bh, 88 struct buffer_head *insert_bh); 89 90 static int ocfs2_mknod_locked(struct ocfs2_super *osb, 91 struct inode *dir, 92 struct dentry *dentry, int mode, 93 dev_t dev, 94 struct buffer_head **new_fe_bh, 95 struct buffer_head *parent_fe_bh, 96 handle_t *handle, 97 struct inode **ret_inode, 98 struct ocfs2_alloc_context *inode_ac); 99 100 static int ocfs2_fill_new_dir(struct ocfs2_super *osb, 101 handle_t *handle, 102 struct inode *parent, 103 struct inode *inode, 104 struct buffer_head *fe_bh, 105 struct ocfs2_alloc_context *data_ac); 106 107 static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb, 108 struct inode **ret_orphan_dir, 109 struct inode *inode, 110 char *name, 111 struct buffer_head **de_bh); 112 113 static int ocfs2_orphan_add(struct ocfs2_super *osb, 114 handle_t *handle, 115 struct inode *inode, 116 struct ocfs2_dinode *fe, 117 char *name, 118 struct buffer_head *de_bh, 119 struct inode *orphan_dir_inode); 120 121 static int ocfs2_create_symlink_data(struct ocfs2_super *osb, 122 handle_t *handle, 123 struct inode *inode, 124 const char *symname); 125 126 static inline int ocfs2_add_entry(handle_t *handle, 127 struct dentry *dentry, 128 struct inode *inode, u64 blkno, 129 struct buffer_head *parent_fe_bh, 130 struct buffer_head *insert_bh) 131 { 132 return __ocfs2_add_entry(handle, dentry->d_parent->d_inode, 133 dentry->d_name.name, dentry->d_name.len, 134 inode, blkno, parent_fe_bh, insert_bh); 135 } 136 137 /* An orphan dir name is an 8 byte value, printed as a hex string */ 138 #define OCFS2_ORPHAN_NAMELEN ((int)(2 * sizeof(u64))) 139 140 static struct dentry *ocfs2_lookup(struct inode *dir, struct dentry *dentry, 141 struct nameidata *nd) 142 { 143 int status; 144 u64 blkno; 145 struct buffer_head *dirent_bh = NULL; 146 struct inode *inode = NULL; 147 struct dentry *ret; 148 struct ocfs2_dir_entry *dirent; 149 struct ocfs2_inode_info *oi; 150 151 mlog_entry("(0x%p, 0x%p, '%.*s')\n", dir, dentry, 152 dentry->d_name.len, dentry->d_name.name); 153 154 if (dentry->d_name.len > OCFS2_MAX_FILENAME_LEN) { 155 ret = ERR_PTR(-ENAMETOOLONG); 156 goto bail; 157 } 158 159 mlog(0, "find name %.*s in directory %llu\n", dentry->d_name.len, 160 dentry->d_name.name, (unsigned long long)OCFS2_I(dir)->ip_blkno); 161 162 status = ocfs2_meta_lock(dir, NULL, 0); 163 if (status < 0) { 164 if (status != -ENOENT) 165 mlog_errno(status); 166 ret = ERR_PTR(status); 167 goto bail; 168 } 169 170 status = ocfs2_find_files_on_disk(dentry->d_name.name, 171 dentry->d_name.len, &blkno, 172 dir, &dirent_bh, &dirent); 173 if (status < 0) 174 goto bail_add; 175 176 inode = ocfs2_iget(OCFS2_SB(dir->i_sb), blkno, 0); 177 if (IS_ERR(inode)) { 178 mlog(ML_ERROR, "Unable to create inode %llu\n", 179 (unsigned long long)blkno); 180 ret = ERR_PTR(-EACCES); 181 goto bail_unlock; 182 } 183 184 oi = OCFS2_I(inode); 185 /* Clear any orphaned state... If we were able to look up the 186 * inode from a directory, it certainly can't be orphaned. We 187 * might have the bad state from a node which intended to 188 * orphan this inode but crashed before it could commit the 189 * unlink. */ 190 spin_lock(&oi->ip_lock); 191 oi->ip_flags &= ~OCFS2_INODE_MAYBE_ORPHANED; 192 oi->ip_orphaned_slot = OCFS2_INVALID_SLOT; 193 spin_unlock(&oi->ip_lock); 194 195 bail_add: 196 dentry->d_op = &ocfs2_dentry_ops; 197 ret = d_splice_alias(inode, dentry); 198 199 if (inode) { 200 /* 201 * If d_splice_alias() finds a DCACHE_DISCONNECTED 202 * dentry, it will d_move() it on top of ourse. The 203 * return value will indicate this however, so in 204 * those cases, we switch them around for the locking 205 * code. 206 * 207 * NOTE: This dentry already has ->d_op set from 208 * ocfs2_get_parent() and ocfs2_get_dentry() 209 */ 210 if (ret) 211 dentry = ret; 212 213 status = ocfs2_dentry_attach_lock(dentry, inode, 214 OCFS2_I(dir)->ip_blkno); 215 if (status) { 216 mlog_errno(status); 217 ret = ERR_PTR(status); 218 goto bail_unlock; 219 } 220 } 221 222 bail_unlock: 223 /* Don't drop the cluster lock until *after* the d_add -- 224 * unlink on another node will message us to remove that 225 * dentry under this lock so otherwise we can race this with 226 * the vote thread and have a stale dentry. */ 227 ocfs2_meta_unlock(dir, 0); 228 229 bail: 230 if (dirent_bh) 231 brelse(dirent_bh); 232 233 mlog_exit_ptr(ret); 234 235 return ret; 236 } 237 238 static int ocfs2_fill_new_dir(struct ocfs2_super *osb, 239 handle_t *handle, 240 struct inode *parent, 241 struct inode *inode, 242 struct buffer_head *fe_bh, 243 struct ocfs2_alloc_context *data_ac) 244 { 245 int status; 246 struct buffer_head *new_bh = NULL; 247 struct ocfs2_dir_entry *de = NULL; 248 249 mlog_entry_void(); 250 251 status = ocfs2_do_extend_dir(osb->sb, handle, inode, fe_bh, 252 data_ac, NULL, &new_bh); 253 if (status < 0) { 254 mlog_errno(status); 255 goto bail; 256 } 257 258 ocfs2_set_new_buffer_uptodate(inode, new_bh); 259 260 status = ocfs2_journal_access(handle, inode, new_bh, 261 OCFS2_JOURNAL_ACCESS_CREATE); 262 if (status < 0) { 263 mlog_errno(status); 264 goto bail; 265 } 266 memset(new_bh->b_data, 0, osb->sb->s_blocksize); 267 268 de = (struct ocfs2_dir_entry *) new_bh->b_data; 269 de->inode = cpu_to_le64(OCFS2_I(inode)->ip_blkno); 270 de->name_len = 1; 271 de->rec_len = 272 cpu_to_le16(OCFS2_DIR_REC_LEN(de->name_len)); 273 strcpy(de->name, "."); 274 ocfs2_set_de_type(de, S_IFDIR); 275 de = (struct ocfs2_dir_entry *) ((char *)de + le16_to_cpu(de->rec_len)); 276 de->inode = cpu_to_le64(OCFS2_I(parent)->ip_blkno); 277 de->rec_len = cpu_to_le16(inode->i_sb->s_blocksize - 278 OCFS2_DIR_REC_LEN(1)); 279 de->name_len = 2; 280 strcpy(de->name, ".."); 281 ocfs2_set_de_type(de, S_IFDIR); 282 283 status = ocfs2_journal_dirty(handle, new_bh); 284 if (status < 0) { 285 mlog_errno(status); 286 goto bail; 287 } 288 289 i_size_write(inode, inode->i_sb->s_blocksize); 290 inode->i_nlink = 2; 291 inode->i_blocks = ocfs2_align_bytes_to_sectors(inode->i_sb->s_blocksize); 292 status = ocfs2_mark_inode_dirty(handle, inode, fe_bh); 293 if (status < 0) { 294 mlog_errno(status); 295 goto bail; 296 } 297 298 status = 0; 299 bail: 300 if (new_bh) 301 brelse(new_bh); 302 303 mlog_exit(status); 304 return status; 305 } 306 307 static int ocfs2_mknod(struct inode *dir, 308 struct dentry *dentry, 309 int mode, 310 dev_t dev) 311 { 312 int status = 0; 313 struct buffer_head *parent_fe_bh = NULL; 314 handle_t *handle = NULL; 315 struct ocfs2_super *osb; 316 struct ocfs2_dinode *dirfe; 317 struct buffer_head *new_fe_bh = NULL; 318 struct buffer_head *de_bh = NULL; 319 struct inode *inode = NULL; 320 struct ocfs2_alloc_context *inode_ac = NULL; 321 struct ocfs2_alloc_context *data_ac = NULL; 322 323 mlog_entry("(0x%p, 0x%p, %d, %lu, '%.*s')\n", dir, dentry, mode, 324 (unsigned long)dev, dentry->d_name.len, 325 dentry->d_name.name); 326 327 /* get our super block */ 328 osb = OCFS2_SB(dir->i_sb); 329 330 status = ocfs2_meta_lock(dir, &parent_fe_bh, 1); 331 if (status < 0) { 332 if (status != -ENOENT) 333 mlog_errno(status); 334 return status; 335 } 336 337 if (S_ISDIR(mode) && (dir->i_nlink >= OCFS2_LINK_MAX)) { 338 status = -EMLINK; 339 goto leave; 340 } 341 342 dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data; 343 if (!dirfe->i_links_count) { 344 /* can't make a file in a deleted directory. */ 345 status = -ENOENT; 346 goto leave; 347 } 348 349 status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name, 350 dentry->d_name.len); 351 if (status) 352 goto leave; 353 354 /* get a spot inside the dir. */ 355 status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh, 356 dentry->d_name.name, 357 dentry->d_name.len, &de_bh); 358 if (status < 0) { 359 mlog_errno(status); 360 goto leave; 361 } 362 363 /* reserve an inode spot */ 364 status = ocfs2_reserve_new_inode(osb, &inode_ac); 365 if (status < 0) { 366 if (status != -ENOSPC) 367 mlog_errno(status); 368 goto leave; 369 } 370 371 /* are we making a directory? If so, reserve a cluster for his 372 * 1st extent. */ 373 if (S_ISDIR(mode)) { 374 status = ocfs2_reserve_clusters(osb, 1, &data_ac); 375 if (status < 0) { 376 if (status != -ENOSPC) 377 mlog_errno(status); 378 goto leave; 379 } 380 } 381 382 handle = ocfs2_start_trans(osb, OCFS2_MKNOD_CREDITS); 383 if (IS_ERR(handle)) { 384 status = PTR_ERR(handle); 385 handle = NULL; 386 mlog_errno(status); 387 goto leave; 388 } 389 390 /* do the real work now. */ 391 status = ocfs2_mknod_locked(osb, dir, dentry, mode, dev, 392 &new_fe_bh, parent_fe_bh, handle, 393 &inode, inode_ac); 394 if (status < 0) { 395 mlog_errno(status); 396 goto leave; 397 } 398 399 if (S_ISDIR(mode)) { 400 status = ocfs2_fill_new_dir(osb, handle, dir, inode, 401 new_fe_bh, data_ac); 402 if (status < 0) { 403 mlog_errno(status); 404 goto leave; 405 } 406 407 status = ocfs2_journal_access(handle, dir, parent_fe_bh, 408 OCFS2_JOURNAL_ACCESS_WRITE); 409 if (status < 0) { 410 mlog_errno(status); 411 goto leave; 412 } 413 le16_add_cpu(&dirfe->i_links_count, 1); 414 status = ocfs2_journal_dirty(handle, parent_fe_bh); 415 if (status < 0) { 416 mlog_errno(status); 417 goto leave; 418 } 419 inc_nlink(dir); 420 } 421 422 status = ocfs2_add_entry(handle, dentry, inode, 423 OCFS2_I(inode)->ip_blkno, parent_fe_bh, 424 de_bh); 425 if (status < 0) { 426 mlog_errno(status); 427 goto leave; 428 } 429 430 status = ocfs2_dentry_attach_lock(dentry, inode, 431 OCFS2_I(dir)->ip_blkno); 432 if (status) { 433 mlog_errno(status); 434 goto leave; 435 } 436 437 insert_inode_hash(inode); 438 dentry->d_op = &ocfs2_dentry_ops; 439 d_instantiate(dentry, inode); 440 status = 0; 441 leave: 442 if (handle) 443 ocfs2_commit_trans(osb, handle); 444 445 ocfs2_meta_unlock(dir, 1); 446 447 if (status == -ENOSPC) 448 mlog(0, "Disk is full\n"); 449 450 if (new_fe_bh) 451 brelse(new_fe_bh); 452 453 if (de_bh) 454 brelse(de_bh); 455 456 if (parent_fe_bh) 457 brelse(parent_fe_bh); 458 459 if ((status < 0) && inode) 460 iput(inode); 461 462 if (inode_ac) 463 ocfs2_free_alloc_context(inode_ac); 464 465 if (data_ac) 466 ocfs2_free_alloc_context(data_ac); 467 468 mlog_exit(status); 469 470 return status; 471 } 472 473 static int ocfs2_mknod_locked(struct ocfs2_super *osb, 474 struct inode *dir, 475 struct dentry *dentry, int mode, 476 dev_t dev, 477 struct buffer_head **new_fe_bh, 478 struct buffer_head *parent_fe_bh, 479 handle_t *handle, 480 struct inode **ret_inode, 481 struct ocfs2_alloc_context *inode_ac) 482 { 483 int status = 0; 484 struct ocfs2_dinode *fe = NULL; 485 struct ocfs2_extent_list *fel; 486 u64 fe_blkno = 0; 487 u16 suballoc_bit; 488 struct inode *inode = NULL; 489 490 mlog_entry("(0x%p, 0x%p, %d, %lu, '%.*s')\n", dir, dentry, mode, 491 (unsigned long)dev, dentry->d_name.len, 492 dentry->d_name.name); 493 494 *new_fe_bh = NULL; 495 *ret_inode = NULL; 496 497 status = ocfs2_claim_new_inode(osb, handle, inode_ac, &suballoc_bit, 498 &fe_blkno); 499 if (status < 0) { 500 mlog_errno(status); 501 goto leave; 502 } 503 504 inode = new_inode(dir->i_sb); 505 if (IS_ERR(inode)) { 506 status = PTR_ERR(inode); 507 mlog(ML_ERROR, "new_inode failed!\n"); 508 goto leave; 509 } 510 511 /* populate as many fields early on as possible - many of 512 * these are used by the support functions here and in 513 * callers. */ 514 inode->i_ino = ino_from_blkno(osb->sb, fe_blkno); 515 OCFS2_I(inode)->ip_blkno = fe_blkno; 516 if (S_ISDIR(mode)) 517 inode->i_nlink = 2; 518 else 519 inode->i_nlink = 1; 520 inode->i_mode = mode; 521 spin_lock(&osb->osb_lock); 522 inode->i_generation = osb->s_next_generation++; 523 spin_unlock(&osb->osb_lock); 524 525 *new_fe_bh = sb_getblk(osb->sb, fe_blkno); 526 if (!*new_fe_bh) { 527 status = -EIO; 528 mlog_errno(status); 529 goto leave; 530 } 531 ocfs2_set_new_buffer_uptodate(inode, *new_fe_bh); 532 533 status = ocfs2_journal_access(handle, inode, *new_fe_bh, 534 OCFS2_JOURNAL_ACCESS_CREATE); 535 if (status < 0) { 536 mlog_errno(status); 537 goto leave; 538 } 539 540 fe = (struct ocfs2_dinode *) (*new_fe_bh)->b_data; 541 memset(fe, 0, osb->sb->s_blocksize); 542 543 fe->i_generation = cpu_to_le32(inode->i_generation); 544 fe->i_fs_generation = cpu_to_le32(osb->fs_generation); 545 fe->i_blkno = cpu_to_le64(fe_blkno); 546 fe->i_suballoc_bit = cpu_to_le16(suballoc_bit); 547 fe->i_suballoc_slot = cpu_to_le16(osb->slot_num); 548 fe->i_uid = cpu_to_le32(current->fsuid); 549 if (dir->i_mode & S_ISGID) { 550 fe->i_gid = cpu_to_le32(dir->i_gid); 551 if (S_ISDIR(mode)) 552 mode |= S_ISGID; 553 } else 554 fe->i_gid = cpu_to_le32(current->fsgid); 555 fe->i_mode = cpu_to_le16(mode); 556 if (S_ISCHR(mode) || S_ISBLK(mode)) 557 fe->id1.dev1.i_rdev = cpu_to_le64(huge_encode_dev(dev)); 558 559 fe->i_links_count = cpu_to_le16(inode->i_nlink); 560 561 fe->i_last_eb_blk = 0; 562 strcpy(fe->i_signature, OCFS2_INODE_SIGNATURE); 563 le32_add_cpu(&fe->i_flags, OCFS2_VALID_FL); 564 fe->i_atime = fe->i_ctime = fe->i_mtime = 565 cpu_to_le64(CURRENT_TIME.tv_sec); 566 fe->i_mtime_nsec = fe->i_ctime_nsec = fe->i_atime_nsec = 567 cpu_to_le32(CURRENT_TIME.tv_nsec); 568 fe->i_dtime = 0; 569 570 fel = &fe->id2.i_list; 571 fel->l_tree_depth = 0; 572 fel->l_next_free_rec = 0; 573 fel->l_count = cpu_to_le16(ocfs2_extent_recs_per_inode(osb->sb)); 574 575 status = ocfs2_journal_dirty(handle, *new_fe_bh); 576 if (status < 0) { 577 mlog_errno(status); 578 goto leave; 579 } 580 581 if (ocfs2_populate_inode(inode, fe, 1) < 0) { 582 mlog(ML_ERROR, "populate inode failed! bh->b_blocknr=%llu, " 583 "i_blkno=%llu, i_ino=%lu\n", 584 (unsigned long long) (*new_fe_bh)->b_blocknr, 585 (unsigned long long)fe->i_blkno, inode->i_ino); 586 BUG(); 587 } 588 589 ocfs2_inode_set_new(osb, inode); 590 if (!ocfs2_mount_local(osb)) { 591 status = ocfs2_create_new_inode_locks(inode); 592 if (status < 0) 593 mlog_errno(status); 594 } 595 596 status = 0; /* error in ocfs2_create_new_inode_locks is not 597 * critical */ 598 599 *ret_inode = inode; 600 leave: 601 if (status < 0) { 602 if (*new_fe_bh) { 603 brelse(*new_fe_bh); 604 *new_fe_bh = NULL; 605 } 606 if (inode) 607 iput(inode); 608 } 609 610 mlog_exit(status); 611 return status; 612 } 613 614 static int ocfs2_mkdir(struct inode *dir, 615 struct dentry *dentry, 616 int mode) 617 { 618 int ret; 619 620 mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", dir, dentry, mode, 621 dentry->d_name.len, dentry->d_name.name); 622 ret = ocfs2_mknod(dir, dentry, mode | S_IFDIR, 0); 623 mlog_exit(ret); 624 625 return ret; 626 } 627 628 static int ocfs2_create(struct inode *dir, 629 struct dentry *dentry, 630 int mode, 631 struct nameidata *nd) 632 { 633 int ret; 634 635 mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", dir, dentry, mode, 636 dentry->d_name.len, dentry->d_name.name); 637 ret = ocfs2_mknod(dir, dentry, mode | S_IFREG, 0); 638 mlog_exit(ret); 639 640 return ret; 641 } 642 643 static int ocfs2_link(struct dentry *old_dentry, 644 struct inode *dir, 645 struct dentry *dentry) 646 { 647 handle_t *handle; 648 struct inode *inode = old_dentry->d_inode; 649 int err; 650 struct buffer_head *fe_bh = NULL; 651 struct buffer_head *parent_fe_bh = NULL; 652 struct buffer_head *de_bh = NULL; 653 struct ocfs2_dinode *fe = NULL; 654 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb); 655 656 mlog_entry("(inode=%lu, old='%.*s' new='%.*s')\n", inode->i_ino, 657 old_dentry->d_name.len, old_dentry->d_name.name, 658 dentry->d_name.len, dentry->d_name.name); 659 660 if (S_ISDIR(inode->i_mode)) 661 return -EPERM; 662 663 err = ocfs2_meta_lock(dir, &parent_fe_bh, 1); 664 if (err < 0) { 665 if (err != -ENOENT) 666 mlog_errno(err); 667 return err; 668 } 669 670 if (!dir->i_nlink) { 671 err = -ENOENT; 672 goto out; 673 } 674 675 err = ocfs2_check_dir_for_entry(dir, dentry->d_name.name, 676 dentry->d_name.len); 677 if (err) 678 goto out; 679 680 err = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh, 681 dentry->d_name.name, 682 dentry->d_name.len, &de_bh); 683 if (err < 0) { 684 mlog_errno(err); 685 goto out; 686 } 687 688 err = ocfs2_meta_lock(inode, &fe_bh, 1); 689 if (err < 0) { 690 if (err != -ENOENT) 691 mlog_errno(err); 692 goto out; 693 } 694 695 fe = (struct ocfs2_dinode *) fe_bh->b_data; 696 if (le16_to_cpu(fe->i_links_count) >= OCFS2_LINK_MAX) { 697 err = -EMLINK; 698 goto out_unlock_inode; 699 } 700 701 handle = ocfs2_start_trans(osb, OCFS2_LINK_CREDITS); 702 if (IS_ERR(handle)) { 703 err = PTR_ERR(handle); 704 handle = NULL; 705 mlog_errno(err); 706 goto out_unlock_inode; 707 } 708 709 err = ocfs2_journal_access(handle, inode, fe_bh, 710 OCFS2_JOURNAL_ACCESS_WRITE); 711 if (err < 0) { 712 mlog_errno(err); 713 goto out_commit; 714 } 715 716 inc_nlink(inode); 717 inode->i_ctime = CURRENT_TIME; 718 fe->i_links_count = cpu_to_le16(inode->i_nlink); 719 fe->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec); 720 fe->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec); 721 722 err = ocfs2_journal_dirty(handle, fe_bh); 723 if (err < 0) { 724 le16_add_cpu(&fe->i_links_count, -1); 725 drop_nlink(inode); 726 mlog_errno(err); 727 goto out_commit; 728 } 729 730 err = ocfs2_add_entry(handle, dentry, inode, 731 OCFS2_I(inode)->ip_blkno, 732 parent_fe_bh, de_bh); 733 if (err) { 734 le16_add_cpu(&fe->i_links_count, -1); 735 drop_nlink(inode); 736 mlog_errno(err); 737 goto out_commit; 738 } 739 740 err = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno); 741 if (err) { 742 mlog_errno(err); 743 goto out_commit; 744 } 745 746 atomic_inc(&inode->i_count); 747 dentry->d_op = &ocfs2_dentry_ops; 748 d_instantiate(dentry, inode); 749 750 out_commit: 751 ocfs2_commit_trans(osb, handle); 752 out_unlock_inode: 753 ocfs2_meta_unlock(inode, 1); 754 755 out: 756 ocfs2_meta_unlock(dir, 1); 757 758 if (de_bh) 759 brelse(de_bh); 760 if (fe_bh) 761 brelse(fe_bh); 762 if (parent_fe_bh) 763 brelse(parent_fe_bh); 764 765 mlog_exit(err); 766 767 return err; 768 } 769 770 /* 771 * Takes and drops an exclusive lock on the given dentry. This will 772 * force other nodes to drop it. 773 */ 774 static int ocfs2_remote_dentry_delete(struct dentry *dentry) 775 { 776 int ret; 777 778 ret = ocfs2_dentry_lock(dentry, 1); 779 if (ret) 780 mlog_errno(ret); 781 else 782 ocfs2_dentry_unlock(dentry, 1); 783 784 return ret; 785 } 786 787 static inline int inode_is_unlinkable(struct inode *inode) 788 { 789 if (S_ISDIR(inode->i_mode)) { 790 if (inode->i_nlink == 2) 791 return 1; 792 return 0; 793 } 794 795 if (inode->i_nlink == 1) 796 return 1; 797 return 0; 798 } 799 800 static int ocfs2_unlink(struct inode *dir, 801 struct dentry *dentry) 802 { 803 int status; 804 int child_locked = 0; 805 struct inode *inode = dentry->d_inode; 806 struct inode *orphan_dir = NULL; 807 struct ocfs2_super *osb = OCFS2_SB(dir->i_sb); 808 u64 blkno; 809 struct ocfs2_dinode *fe = NULL; 810 struct buffer_head *fe_bh = NULL; 811 struct buffer_head *parent_node_bh = NULL; 812 handle_t *handle = NULL; 813 struct ocfs2_dir_entry *dirent = NULL; 814 struct buffer_head *dirent_bh = NULL; 815 char orphan_name[OCFS2_ORPHAN_NAMELEN + 1]; 816 struct buffer_head *orphan_entry_bh = NULL; 817 818 mlog_entry("(0x%p, 0x%p, '%.*s')\n", dir, dentry, 819 dentry->d_name.len, dentry->d_name.name); 820 821 BUG_ON(dentry->d_parent->d_inode != dir); 822 823 mlog(0, "ino = %llu\n", (unsigned long long)OCFS2_I(inode)->ip_blkno); 824 825 if (inode == osb->root_inode) { 826 mlog(0, "Cannot delete the root directory\n"); 827 return -EPERM; 828 } 829 830 status = ocfs2_meta_lock(dir, &parent_node_bh, 1); 831 if (status < 0) { 832 if (status != -ENOENT) 833 mlog_errno(status); 834 return status; 835 } 836 837 status = ocfs2_find_files_on_disk(dentry->d_name.name, 838 dentry->d_name.len, &blkno, 839 dir, &dirent_bh, &dirent); 840 if (status < 0) { 841 if (status != -ENOENT) 842 mlog_errno(status); 843 goto leave; 844 } 845 846 if (OCFS2_I(inode)->ip_blkno != blkno) { 847 status = -ENOENT; 848 849 mlog(0, "ip_blkno %llu != dirent blkno %llu ip_flags = %x\n", 850 (unsigned long long)OCFS2_I(inode)->ip_blkno, 851 (unsigned long long)blkno, OCFS2_I(inode)->ip_flags); 852 goto leave; 853 } 854 855 status = ocfs2_meta_lock(inode, &fe_bh, 1); 856 if (status < 0) { 857 if (status != -ENOENT) 858 mlog_errno(status); 859 goto leave; 860 } 861 child_locked = 1; 862 863 if (S_ISDIR(inode->i_mode)) { 864 if (!ocfs2_empty_dir(inode)) { 865 status = -ENOTEMPTY; 866 goto leave; 867 } else if (inode->i_nlink != 2) { 868 status = -ENOTEMPTY; 869 goto leave; 870 } 871 } 872 873 status = ocfs2_remote_dentry_delete(dentry); 874 if (status < 0) { 875 /* This vote should succeed under all normal 876 * circumstances. */ 877 mlog_errno(status); 878 goto leave; 879 } 880 881 if (inode_is_unlinkable(inode)) { 882 status = ocfs2_prepare_orphan_dir(osb, &orphan_dir, inode, 883 orphan_name, 884 &orphan_entry_bh); 885 if (status < 0) { 886 mlog_errno(status); 887 goto leave; 888 } 889 } 890 891 handle = ocfs2_start_trans(osb, OCFS2_UNLINK_CREDITS); 892 if (IS_ERR(handle)) { 893 status = PTR_ERR(handle); 894 handle = NULL; 895 mlog_errno(status); 896 goto leave; 897 } 898 899 status = ocfs2_journal_access(handle, inode, fe_bh, 900 OCFS2_JOURNAL_ACCESS_WRITE); 901 if (status < 0) { 902 mlog_errno(status); 903 goto leave; 904 } 905 906 fe = (struct ocfs2_dinode *) fe_bh->b_data; 907 908 if (inode_is_unlinkable(inode)) { 909 status = ocfs2_orphan_add(osb, handle, inode, fe, orphan_name, 910 orphan_entry_bh, orphan_dir); 911 if (status < 0) { 912 mlog_errno(status); 913 goto leave; 914 } 915 } 916 917 /* delete the name from the parent dir */ 918 status = ocfs2_delete_entry(handle, dir, dirent, dirent_bh); 919 if (status < 0) { 920 mlog_errno(status); 921 goto leave; 922 } 923 924 if (S_ISDIR(inode->i_mode)) 925 drop_nlink(inode); 926 drop_nlink(inode); 927 fe->i_links_count = cpu_to_le16(inode->i_nlink); 928 929 status = ocfs2_journal_dirty(handle, fe_bh); 930 if (status < 0) { 931 mlog_errno(status); 932 goto leave; 933 } 934 935 dir->i_ctime = dir->i_mtime = CURRENT_TIME; 936 if (S_ISDIR(inode->i_mode)) 937 drop_nlink(dir); 938 939 status = ocfs2_mark_inode_dirty(handle, dir, parent_node_bh); 940 if (status < 0) { 941 mlog_errno(status); 942 if (S_ISDIR(inode->i_mode)) 943 inc_nlink(dir); 944 } 945 946 leave: 947 if (handle) 948 ocfs2_commit_trans(osb, handle); 949 950 if (child_locked) 951 ocfs2_meta_unlock(inode, 1); 952 953 ocfs2_meta_unlock(dir, 1); 954 955 if (orphan_dir) { 956 /* This was locked for us in ocfs2_prepare_orphan_dir() */ 957 ocfs2_meta_unlock(orphan_dir, 1); 958 mutex_unlock(&orphan_dir->i_mutex); 959 iput(orphan_dir); 960 } 961 962 if (fe_bh) 963 brelse(fe_bh); 964 965 if (dirent_bh) 966 brelse(dirent_bh); 967 968 if (parent_node_bh) 969 brelse(parent_node_bh); 970 971 if (orphan_entry_bh) 972 brelse(orphan_entry_bh); 973 974 mlog_exit(status); 975 976 return status; 977 } 978 979 /* 980 * The only place this should be used is rename! 981 * if they have the same id, then the 1st one is the only one locked. 982 */ 983 static int ocfs2_double_lock(struct ocfs2_super *osb, 984 struct buffer_head **bh1, 985 struct inode *inode1, 986 struct buffer_head **bh2, 987 struct inode *inode2) 988 { 989 int status; 990 struct ocfs2_inode_info *oi1 = OCFS2_I(inode1); 991 struct ocfs2_inode_info *oi2 = OCFS2_I(inode2); 992 struct buffer_head **tmpbh; 993 struct inode *tmpinode; 994 995 mlog_entry("(inode1 = %llu, inode2 = %llu)\n", 996 (unsigned long long)oi1->ip_blkno, 997 (unsigned long long)oi2->ip_blkno); 998 999 if (*bh1) 1000 *bh1 = NULL; 1001 if (*bh2) 1002 *bh2 = NULL; 1003 1004 /* we always want to lock the one with the lower lockid first. */ 1005 if (oi1->ip_blkno != oi2->ip_blkno) { 1006 if (oi1->ip_blkno < oi2->ip_blkno) { 1007 /* switch id1 and id2 around */ 1008 mlog(0, "switching them around...\n"); 1009 tmpbh = bh2; 1010 bh2 = bh1; 1011 bh1 = tmpbh; 1012 1013 tmpinode = inode2; 1014 inode2 = inode1; 1015 inode1 = tmpinode; 1016 } 1017 /* lock id2 */ 1018 status = ocfs2_meta_lock(inode2, bh2, 1); 1019 if (status < 0) { 1020 if (status != -ENOENT) 1021 mlog_errno(status); 1022 goto bail; 1023 } 1024 } 1025 1026 /* lock id1 */ 1027 status = ocfs2_meta_lock(inode1, bh1, 1); 1028 if (status < 0) { 1029 /* 1030 * An error return must mean that no cluster locks 1031 * were held on function exit. 1032 */ 1033 if (oi1->ip_blkno != oi2->ip_blkno) 1034 ocfs2_meta_unlock(inode2, 1); 1035 1036 if (status != -ENOENT) 1037 mlog_errno(status); 1038 } 1039 1040 bail: 1041 mlog_exit(status); 1042 return status; 1043 } 1044 1045 static void ocfs2_double_unlock(struct inode *inode1, struct inode *inode2) 1046 { 1047 ocfs2_meta_unlock(inode1, 1); 1048 1049 if (inode1 != inode2) 1050 ocfs2_meta_unlock(inode2, 1); 1051 } 1052 1053 #define PARENT_INO(buffer) \ 1054 ((struct ocfs2_dir_entry *) \ 1055 ((char *)buffer + \ 1056 le16_to_cpu(((struct ocfs2_dir_entry *)buffer)->rec_len)))->inode 1057 1058 static int ocfs2_rename(struct inode *old_dir, 1059 struct dentry *old_dentry, 1060 struct inode *new_dir, 1061 struct dentry *new_dentry) 1062 { 1063 int status = 0, rename_lock = 0, parents_locked = 0; 1064 int old_child_locked = 0, new_child_locked = 0; 1065 struct inode *old_inode = old_dentry->d_inode; 1066 struct inode *new_inode = new_dentry->d_inode; 1067 struct inode *orphan_dir = NULL; 1068 struct ocfs2_dinode *newfe = NULL; 1069 char orphan_name[OCFS2_ORPHAN_NAMELEN + 1]; 1070 struct buffer_head *orphan_entry_bh = NULL; 1071 struct buffer_head *newfe_bh = NULL; 1072 struct buffer_head *old_inode_bh = NULL; 1073 struct buffer_head *insert_entry_bh = NULL; 1074 struct ocfs2_super *osb = NULL; 1075 u64 newfe_blkno; 1076 handle_t *handle = NULL; 1077 struct buffer_head *old_dir_bh = NULL; 1078 struct buffer_head *new_dir_bh = NULL; 1079 struct ocfs2_dir_entry *old_de = NULL, *new_de = NULL; // dirent for old_dentry 1080 // and new_dentry 1081 struct buffer_head *new_de_bh = NULL, *old_de_bh = NULL; // bhs for above 1082 struct buffer_head *old_inode_de_bh = NULL; // if old_dentry is a dir, 1083 // this is the 1st dirent bh 1084 nlink_t old_dir_nlink = old_dir->i_nlink; 1085 1086 /* At some point it might be nice to break this function up a 1087 * bit. */ 1088 1089 mlog_entry("(0x%p, 0x%p, 0x%p, 0x%p, from='%.*s' to='%.*s')\n", 1090 old_dir, old_dentry, new_dir, new_dentry, 1091 old_dentry->d_name.len, old_dentry->d_name.name, 1092 new_dentry->d_name.len, new_dentry->d_name.name); 1093 1094 osb = OCFS2_SB(old_dir->i_sb); 1095 1096 if (new_inode) { 1097 if (!igrab(new_inode)) 1098 BUG(); 1099 } 1100 1101 /* Assume a directory hierarchy thusly: 1102 * a/b/c 1103 * a/d 1104 * a,b,c, and d are all directories. 1105 * 1106 * from cwd of 'a' on both nodes: 1107 * node1: mv b/c d 1108 * node2: mv d b/c 1109 * 1110 * And that's why, just like the VFS, we need a file system 1111 * rename lock. */ 1112 if (old_dentry != new_dentry) { 1113 status = ocfs2_rename_lock(osb); 1114 if (status < 0) { 1115 mlog_errno(status); 1116 goto bail; 1117 } 1118 rename_lock = 1; 1119 } 1120 1121 /* if old and new are the same, this'll just do one lock. */ 1122 status = ocfs2_double_lock(osb, &old_dir_bh, old_dir, 1123 &new_dir_bh, new_dir); 1124 if (status < 0) { 1125 mlog_errno(status); 1126 goto bail; 1127 } 1128 parents_locked = 1; 1129 1130 /* make sure both dirs have bhs 1131 * get an extra ref on old_dir_bh if old==new */ 1132 if (!new_dir_bh) { 1133 if (old_dir_bh) { 1134 new_dir_bh = old_dir_bh; 1135 get_bh(new_dir_bh); 1136 } else { 1137 mlog(ML_ERROR, "no old_dir_bh!\n"); 1138 status = -EIO; 1139 goto bail; 1140 } 1141 } 1142 1143 /* 1144 * Aside from allowing a meta data update, the locking here 1145 * also ensures that the vote thread on other nodes won't have 1146 * to concurrently downconvert the inode and the dentry locks. 1147 */ 1148 status = ocfs2_meta_lock(old_inode, &old_inode_bh, 1); 1149 if (status < 0) { 1150 if (status != -ENOENT) 1151 mlog_errno(status); 1152 goto bail; 1153 } 1154 old_child_locked = 1; 1155 1156 status = ocfs2_remote_dentry_delete(old_dentry); 1157 if (status < 0) { 1158 mlog_errno(status); 1159 goto bail; 1160 } 1161 1162 if (S_ISDIR(old_inode->i_mode)) { 1163 status = -EIO; 1164 old_inode_de_bh = ocfs2_bread(old_inode, 0, &status, 0); 1165 if (!old_inode_de_bh) 1166 goto bail; 1167 1168 status = -EIO; 1169 if (le64_to_cpu(PARENT_INO(old_inode_de_bh->b_data)) != 1170 OCFS2_I(old_dir)->ip_blkno) 1171 goto bail; 1172 status = -EMLINK; 1173 if (!new_inode && new_dir!=old_dir && 1174 new_dir->i_nlink >= OCFS2_LINK_MAX) 1175 goto bail; 1176 } 1177 1178 status = -ENOENT; 1179 old_de_bh = ocfs2_find_entry(old_dentry->d_name.name, 1180 old_dentry->d_name.len, 1181 old_dir, &old_de); 1182 if (!old_de_bh) 1183 goto bail; 1184 1185 /* 1186 * Check for inode number is _not_ due to possible IO errors. 1187 * We might rmdir the source, keep it as pwd of some process 1188 * and merrily kill the link to whatever was created under the 1189 * same name. Goodbye sticky bit ;-< 1190 */ 1191 if (le64_to_cpu(old_de->inode) != OCFS2_I(old_inode)->ip_blkno) 1192 goto bail; 1193 1194 /* check if the target already exists (in which case we need 1195 * to delete it */ 1196 status = ocfs2_find_files_on_disk(new_dentry->d_name.name, 1197 new_dentry->d_name.len, 1198 &newfe_blkno, new_dir, &new_de_bh, 1199 &new_de); 1200 /* The only error we allow here is -ENOENT because the new 1201 * file not existing is perfectly valid. */ 1202 if ((status < 0) && (status != -ENOENT)) { 1203 /* If we cannot find the file specified we should just */ 1204 /* return the error... */ 1205 mlog_errno(status); 1206 goto bail; 1207 } 1208 1209 if (!new_de && new_inode) 1210 mlog(ML_ERROR, "inode %lu does not exist in it's parent " 1211 "directory!", new_inode->i_ino); 1212 1213 /* In case we need to overwrite an existing file, we blow it 1214 * away first */ 1215 if (new_de) { 1216 /* VFS didn't think there existed an inode here, but 1217 * someone else in the cluster must have raced our 1218 * rename to create one. Today we error cleanly, in 1219 * the future we should consider calling iget to build 1220 * a new struct inode for this entry. */ 1221 if (!new_inode) { 1222 status = -EACCES; 1223 1224 mlog(0, "We found an inode for name %.*s but VFS " 1225 "didn't give us one.\n", new_dentry->d_name.len, 1226 new_dentry->d_name.name); 1227 goto bail; 1228 } 1229 1230 if (OCFS2_I(new_inode)->ip_blkno != newfe_blkno) { 1231 status = -EACCES; 1232 1233 mlog(0, "Inode %llu and dir %llu disagree. flags = %x\n", 1234 (unsigned long long)OCFS2_I(new_inode)->ip_blkno, 1235 (unsigned long long)newfe_blkno, 1236 OCFS2_I(new_inode)->ip_flags); 1237 goto bail; 1238 } 1239 1240 status = ocfs2_meta_lock(new_inode, &newfe_bh, 1); 1241 if (status < 0) { 1242 if (status != -ENOENT) 1243 mlog_errno(status); 1244 goto bail; 1245 } 1246 new_child_locked = 1; 1247 1248 status = ocfs2_remote_dentry_delete(new_dentry); 1249 if (status < 0) { 1250 mlog_errno(status); 1251 goto bail; 1252 } 1253 1254 newfe = (struct ocfs2_dinode *) newfe_bh->b_data; 1255 1256 mlog(0, "aha rename over existing... new_de=%p new_blkno=%llu " 1257 "newfebh=%p bhblocknr=%llu\n", new_de, 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 new_inode, 1264 orphan_name, 1265 &orphan_entry_bh); 1266 if (status < 0) { 1267 mlog_errno(status); 1268 goto bail; 1269 } 1270 } 1271 } else { 1272 BUG_ON(new_dentry->d_parent->d_inode != new_dir); 1273 1274 status = ocfs2_check_dir_for_entry(new_dir, 1275 new_dentry->d_name.name, 1276 new_dentry->d_name.len); 1277 if (status) 1278 goto bail; 1279 1280 status = ocfs2_prepare_dir_for_insert(osb, new_dir, new_dir_bh, 1281 new_dentry->d_name.name, 1282 new_dentry->d_name.len, 1283 &insert_entry_bh); 1284 if (status < 0) { 1285 mlog_errno(status); 1286 goto bail; 1287 } 1288 } 1289 1290 handle = ocfs2_start_trans(osb, OCFS2_RENAME_CREDITS); 1291 if (IS_ERR(handle)) { 1292 status = PTR_ERR(handle); 1293 handle = NULL; 1294 mlog_errno(status); 1295 goto bail; 1296 } 1297 1298 if (new_de) { 1299 if (S_ISDIR(new_inode->i_mode)) { 1300 if (!ocfs2_empty_dir(new_inode) || 1301 new_inode->i_nlink != 2) { 1302 status = -ENOTEMPTY; 1303 goto bail; 1304 } 1305 } 1306 status = ocfs2_journal_access(handle, new_inode, 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 (newfe->i_links_count == cpu_to_le16(1))){ 1315 status = ocfs2_orphan_add(osb, handle, new_inode, 1316 newfe, orphan_name, 1317 orphan_entry_bh, 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_journal_access(handle, new_dir, new_de_bh, 1326 OCFS2_JOURNAL_ACCESS_WRITE); 1327 if (status < 0) { 1328 mlog_errno(status); 1329 goto bail; 1330 } 1331 new_de->inode = cpu_to_le64(OCFS2_I(old_inode)->ip_blkno); 1332 new_de->file_type = old_de->file_type; 1333 new_dir->i_version++; 1334 status = ocfs2_journal_dirty(handle, new_de_bh); 1335 if (status < 0) { 1336 mlog_errno(status); 1337 goto bail; 1338 } 1339 1340 if (S_ISDIR(new_inode->i_mode)) 1341 newfe->i_links_count = 0; 1342 else 1343 le16_add_cpu(&newfe->i_links_count, -1); 1344 1345 status = ocfs2_journal_dirty(handle, newfe_bh); 1346 if (status < 0) { 1347 mlog_errno(status); 1348 goto bail; 1349 } 1350 } else { 1351 /* if the name was not found in new_dir, add it now */ 1352 status = ocfs2_add_entry(handle, new_dentry, old_inode, 1353 OCFS2_I(old_inode)->ip_blkno, 1354 new_dir_bh, insert_entry_bh); 1355 } 1356 1357 old_inode->i_ctime = CURRENT_TIME; 1358 mark_inode_dirty(old_inode); 1359 ocfs2_mark_inode_dirty(handle, old_inode, old_inode_bh); 1360 1361 /* now that the name has been added to new_dir, remove the old name */ 1362 status = ocfs2_delete_entry(handle, old_dir, old_de, old_de_bh); 1363 if (status < 0) { 1364 mlog_errno(status); 1365 goto bail; 1366 } 1367 1368 if (new_inode) { 1369 new_inode->i_nlink--; 1370 new_inode->i_ctime = CURRENT_TIME; 1371 } 1372 old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME; 1373 if (old_inode_de_bh) { 1374 status = ocfs2_journal_access(handle, old_inode, 1375 old_inode_de_bh, 1376 OCFS2_JOURNAL_ACCESS_WRITE); 1377 PARENT_INO(old_inode_de_bh->b_data) = 1378 cpu_to_le64(OCFS2_I(new_dir)->ip_blkno); 1379 status = ocfs2_journal_dirty(handle, old_inode_de_bh); 1380 old_dir->i_nlink--; 1381 if (new_inode) { 1382 new_inode->i_nlink--; 1383 } else { 1384 inc_nlink(new_dir); 1385 mark_inode_dirty(new_dir); 1386 } 1387 } 1388 mark_inode_dirty(old_dir); 1389 ocfs2_mark_inode_dirty(handle, old_dir, old_dir_bh); 1390 if (new_inode) { 1391 mark_inode_dirty(new_inode); 1392 ocfs2_mark_inode_dirty(handle, new_inode, newfe_bh); 1393 } 1394 1395 if (old_dir != new_dir) { 1396 /* Keep the same times on both directories.*/ 1397 new_dir->i_ctime = new_dir->i_mtime = old_dir->i_ctime; 1398 1399 /* 1400 * This will also pick up the i_nlink change from the 1401 * block above. 1402 */ 1403 ocfs2_mark_inode_dirty(handle, new_dir, new_dir_bh); 1404 } 1405 1406 if (old_dir_nlink != old_dir->i_nlink) { 1407 if (!old_dir_bh) { 1408 mlog(ML_ERROR, "need to change nlink for old dir " 1409 "%llu from %d to %d but bh is NULL!\n", 1410 (unsigned long long)OCFS2_I(old_dir)->ip_blkno, 1411 (int)old_dir_nlink, old_dir->i_nlink); 1412 } else { 1413 struct ocfs2_dinode *fe; 1414 status = ocfs2_journal_access(handle, old_dir, 1415 old_dir_bh, 1416 OCFS2_JOURNAL_ACCESS_WRITE); 1417 fe = (struct ocfs2_dinode *) old_dir_bh->b_data; 1418 fe->i_links_count = cpu_to_le16(old_dir->i_nlink); 1419 status = ocfs2_journal_dirty(handle, old_dir_bh); 1420 } 1421 } 1422 1423 ocfs2_dentry_move(old_dentry, new_dentry, old_dir, new_dir); 1424 status = 0; 1425 bail: 1426 if (rename_lock) 1427 ocfs2_rename_unlock(osb); 1428 1429 if (handle) 1430 ocfs2_commit_trans(osb, handle); 1431 1432 if (parents_locked) 1433 ocfs2_double_unlock(old_dir, new_dir); 1434 1435 if (old_child_locked) 1436 ocfs2_meta_unlock(old_inode, 1); 1437 1438 if (new_child_locked) 1439 ocfs2_meta_unlock(new_inode, 1); 1440 1441 if (orphan_dir) { 1442 /* This was locked for us in ocfs2_prepare_orphan_dir() */ 1443 ocfs2_meta_unlock(orphan_dir, 1); 1444 mutex_unlock(&orphan_dir->i_mutex); 1445 iput(orphan_dir); 1446 } 1447 1448 if (new_inode) 1449 sync_mapping_buffers(old_inode->i_mapping); 1450 1451 if (new_inode) 1452 iput(new_inode); 1453 if (newfe_bh) 1454 brelse(newfe_bh); 1455 if (old_inode_bh) 1456 brelse(old_inode_bh); 1457 if (old_dir_bh) 1458 brelse(old_dir_bh); 1459 if (new_dir_bh) 1460 brelse(new_dir_bh); 1461 if (new_de_bh) 1462 brelse(new_de_bh); 1463 if (old_de_bh) 1464 brelse(old_de_bh); 1465 if (old_inode_de_bh) 1466 brelse(old_inode_de_bh); 1467 if (orphan_entry_bh) 1468 brelse(orphan_entry_bh); 1469 if (insert_entry_bh) 1470 brelse(insert_entry_bh); 1471 1472 mlog_exit(status); 1473 1474 return status; 1475 } 1476 1477 /* 1478 * we expect i_size = strlen(symname). Copy symname into the file 1479 * data, including the null terminator. 1480 */ 1481 static int ocfs2_create_symlink_data(struct ocfs2_super *osb, 1482 handle_t *handle, 1483 struct inode *inode, 1484 const char *symname) 1485 { 1486 struct buffer_head **bhs = NULL; 1487 const char *c; 1488 struct super_block *sb = osb->sb; 1489 u64 p_blkno; 1490 int p_blocks; 1491 int virtual, blocks, status, i, bytes_left; 1492 1493 bytes_left = i_size_read(inode) + 1; 1494 /* we can't trust i_blocks because we're actually going to 1495 * write i_size + 1 bytes. */ 1496 blocks = (bytes_left + sb->s_blocksize - 1) >> sb->s_blocksize_bits; 1497 1498 mlog_entry("i_blocks = %llu, i_size = %llu, blocks = %d\n", 1499 (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, 1, &p_blkno, 1518 &p_blocks); 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, bhs[virtual]); 1544 1545 status = ocfs2_journal_access(handle, inode, bhs[virtual], 1546 OCFS2_JOURNAL_ACCESS_CREATE); 1547 if (status < 0) { 1548 mlog_errno(status); 1549 goto bail; 1550 } 1551 1552 memset(bhs[virtual]->b_data, 0, sb->s_blocksize); 1553 1554 memcpy(bhs[virtual]->b_data, c, 1555 (bytes_left > sb->s_blocksize) ? sb->s_blocksize : 1556 bytes_left); 1557 1558 status = ocfs2_journal_dirty(handle, bhs[virtual]); 1559 if (status < 0) { 1560 mlog_errno(status); 1561 goto bail; 1562 } 1563 1564 virtual++; 1565 p_blkno++; 1566 bytes_left -= sb->s_blocksize; 1567 } 1568 1569 status = 0; 1570 bail: 1571 1572 if (bhs) { 1573 for(i = 0; i < blocks; i++) 1574 if (bhs[i]) 1575 brelse(bhs[i]); 1576 kfree(bhs); 1577 } 1578 1579 mlog_exit(status); 1580 return status; 1581 } 1582 1583 static int ocfs2_symlink(struct inode *dir, 1584 struct dentry *dentry, 1585 const char *symname) 1586 { 1587 int status, l, credits; 1588 u64 newsize; 1589 struct ocfs2_super *osb = NULL; 1590 struct inode *inode = NULL; 1591 struct super_block *sb; 1592 struct buffer_head *new_fe_bh = NULL; 1593 struct buffer_head *de_bh = NULL; 1594 struct buffer_head *parent_fe_bh = NULL; 1595 struct ocfs2_dinode *fe = NULL; 1596 struct ocfs2_dinode *dirfe; 1597 handle_t *handle = NULL; 1598 struct ocfs2_alloc_context *inode_ac = NULL; 1599 struct ocfs2_alloc_context *data_ac = NULL; 1600 1601 mlog_entry("(0x%p, 0x%p, symname='%s' actual='%.*s')\n", dir, 1602 dentry, symname, dentry->d_name.len, dentry->d_name.name); 1603 1604 sb = dir->i_sb; 1605 osb = OCFS2_SB(sb); 1606 1607 l = strlen(symname) + 1; 1608 1609 credits = ocfs2_calc_symlink_credits(sb); 1610 1611 /* lock the parent directory */ 1612 status = ocfs2_meta_lock(dir, &parent_fe_bh, 1); 1613 if (status < 0) { 1614 if (status != -ENOENT) 1615 mlog_errno(status); 1616 return status; 1617 } 1618 1619 dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data; 1620 if (!dirfe->i_links_count) { 1621 /* can't make a file in a deleted directory. */ 1622 status = -ENOENT; 1623 goto bail; 1624 } 1625 1626 status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name, 1627 dentry->d_name.len); 1628 if (status) 1629 goto bail; 1630 1631 status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh, 1632 dentry->d_name.name, 1633 dentry->d_name.len, &de_bh); 1634 if (status < 0) { 1635 mlog_errno(status); 1636 goto bail; 1637 } 1638 1639 status = ocfs2_reserve_new_inode(osb, &inode_ac); 1640 if (status < 0) { 1641 if (status != -ENOSPC) 1642 mlog_errno(status); 1643 goto bail; 1644 } 1645 1646 /* don't reserve bitmap space for fast symlinks. */ 1647 if (l > ocfs2_fast_symlink_chars(sb)) { 1648 status = ocfs2_reserve_clusters(osb, 1, &data_ac); 1649 if (status < 0) { 1650 if (status != -ENOSPC) 1651 mlog_errno(status); 1652 goto bail; 1653 } 1654 } 1655 1656 handle = ocfs2_start_trans(osb, credits); 1657 if (IS_ERR(handle)) { 1658 status = PTR_ERR(handle); 1659 handle = NULL; 1660 mlog_errno(status); 1661 goto bail; 1662 } 1663 1664 status = ocfs2_mknod_locked(osb, dir, dentry, 1665 S_IFLNK | S_IRWXUGO, 0, 1666 &new_fe_bh, parent_fe_bh, handle, 1667 &inode, inode_ac); 1668 if (status < 0) { 1669 mlog_errno(status); 1670 goto bail; 1671 } 1672 1673 fe = (struct ocfs2_dinode *) new_fe_bh->b_data; 1674 inode->i_rdev = 0; 1675 newsize = l - 1; 1676 if (l > ocfs2_fast_symlink_chars(sb)) { 1677 inode->i_op = &ocfs2_symlink_inode_operations; 1678 status = ocfs2_do_extend_allocation(osb, inode, 1, new_fe_bh, 1679 handle, data_ac, NULL, 1680 NULL); 1681 if (status < 0) { 1682 if (status != -ENOSPC && status != -EINTR) { 1683 mlog(ML_ERROR, 1684 "Failed to extend file to %llu\n", 1685 (unsigned long long)newsize); 1686 mlog_errno(status); 1687 status = -ENOSPC; 1688 } 1689 goto bail; 1690 } 1691 i_size_write(inode, newsize); 1692 inode->i_blocks = ocfs2_align_bytes_to_sectors(newsize); 1693 } else { 1694 inode->i_op = &ocfs2_fast_symlink_inode_operations; 1695 memcpy((char *) fe->id2.i_symlink, symname, l); 1696 i_size_write(inode, newsize); 1697 inode->i_blocks = 0; 1698 } 1699 1700 status = ocfs2_mark_inode_dirty(handle, inode, new_fe_bh); 1701 if (status < 0) { 1702 mlog_errno(status); 1703 goto bail; 1704 } 1705 1706 if (!ocfs2_inode_is_fast_symlink(inode)) { 1707 status = ocfs2_create_symlink_data(osb, handle, inode, 1708 symname); 1709 if (status < 0) { 1710 mlog_errno(status); 1711 goto bail; 1712 } 1713 } 1714 1715 status = ocfs2_add_entry(handle, dentry, inode, 1716 le64_to_cpu(fe->i_blkno), parent_fe_bh, 1717 de_bh); 1718 if (status < 0) { 1719 mlog_errno(status); 1720 goto bail; 1721 } 1722 1723 status = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno); 1724 if (status) { 1725 mlog_errno(status); 1726 goto bail; 1727 } 1728 1729 insert_inode_hash(inode); 1730 dentry->d_op = &ocfs2_dentry_ops; 1731 d_instantiate(dentry, inode); 1732 bail: 1733 if (handle) 1734 ocfs2_commit_trans(osb, handle); 1735 1736 ocfs2_meta_unlock(dir, 1); 1737 1738 if (new_fe_bh) 1739 brelse(new_fe_bh); 1740 if (parent_fe_bh) 1741 brelse(parent_fe_bh); 1742 if (de_bh) 1743 brelse(de_bh); 1744 if (inode_ac) 1745 ocfs2_free_alloc_context(inode_ac); 1746 if (data_ac) 1747 ocfs2_free_alloc_context(data_ac); 1748 if ((status < 0) && inode) 1749 iput(inode); 1750 1751 mlog_exit(status); 1752 1753 return status; 1754 } 1755 1756 int ocfs2_check_dir_entry(struct inode * dir, 1757 struct ocfs2_dir_entry * de, 1758 struct buffer_head * bh, 1759 unsigned long offset) 1760 { 1761 const char *error_msg = NULL; 1762 const int rlen = le16_to_cpu(de->rec_len); 1763 1764 if (rlen < OCFS2_DIR_REC_LEN(1)) 1765 error_msg = "rec_len is smaller than minimal"; 1766 else if (rlen % 4 != 0) 1767 error_msg = "rec_len % 4 != 0"; 1768 else if (rlen < OCFS2_DIR_REC_LEN(de->name_len)) 1769 error_msg = "rec_len is too small for name_len"; 1770 else if (((char *) de - bh->b_data) + rlen > dir->i_sb->s_blocksize) 1771 error_msg = "directory entry across blocks"; 1772 1773 if (error_msg != NULL) 1774 mlog(ML_ERROR, "bad entry in directory #%llu: %s - " 1775 "offset=%lu, inode=%llu, rec_len=%d, name_len=%d\n", 1776 (unsigned long long)OCFS2_I(dir)->ip_blkno, error_msg, 1777 offset, (unsigned long long)le64_to_cpu(de->inode), rlen, 1778 de->name_len); 1779 return error_msg == NULL ? 1 : 0; 1780 } 1781 1782 /* we don't always have a dentry for what we want to add, so people 1783 * like orphan dir can call this instead. 1784 * 1785 * If you pass me insert_bh, I'll skip the search of the other dir 1786 * blocks and put the record in there. 1787 */ 1788 static int __ocfs2_add_entry(handle_t *handle, 1789 struct inode *dir, 1790 const char *name, int namelen, 1791 struct inode *inode, u64 blkno, 1792 struct buffer_head *parent_fe_bh, 1793 struct buffer_head *insert_bh) 1794 { 1795 unsigned long offset; 1796 unsigned short rec_len; 1797 struct ocfs2_dir_entry *de, *de1; 1798 struct super_block *sb; 1799 int retval, status; 1800 1801 mlog_entry_void(); 1802 1803 sb = dir->i_sb; 1804 1805 if (!namelen) 1806 return -EINVAL; 1807 1808 rec_len = OCFS2_DIR_REC_LEN(namelen); 1809 offset = 0; 1810 de = (struct ocfs2_dir_entry *) insert_bh->b_data; 1811 while (1) { 1812 BUG_ON((char *)de >= sb->s_blocksize + insert_bh->b_data); 1813 /* These checks should've already been passed by the 1814 * prepare function, but I guess we can leave them 1815 * here anyway. */ 1816 if (!ocfs2_check_dir_entry(dir, de, insert_bh, offset)) { 1817 retval = -ENOENT; 1818 goto bail; 1819 } 1820 if (ocfs2_match(namelen, name, de)) { 1821 retval = -EEXIST; 1822 goto bail; 1823 } 1824 if (((le64_to_cpu(de->inode) == 0) && 1825 (le16_to_cpu(de->rec_len) >= rec_len)) || 1826 (le16_to_cpu(de->rec_len) >= 1827 (OCFS2_DIR_REC_LEN(de->name_len) + rec_len))) { 1828 dir->i_mtime = dir->i_ctime = CURRENT_TIME; 1829 retval = ocfs2_mark_inode_dirty(handle, dir, parent_fe_bh); 1830 if (retval < 0) { 1831 mlog_errno(retval); 1832 goto bail; 1833 } 1834 1835 status = ocfs2_journal_access(handle, dir, insert_bh, 1836 OCFS2_JOURNAL_ACCESS_WRITE); 1837 /* By now the buffer is marked for journaling */ 1838 offset += le16_to_cpu(de->rec_len); 1839 if (le64_to_cpu(de->inode)) { 1840 de1 = (struct ocfs2_dir_entry *)((char *) de + 1841 OCFS2_DIR_REC_LEN(de->name_len)); 1842 de1->rec_len = 1843 cpu_to_le16(le16_to_cpu(de->rec_len) - 1844 OCFS2_DIR_REC_LEN(de->name_len)); 1845 de->rec_len = cpu_to_le16(OCFS2_DIR_REC_LEN(de->name_len)); 1846 de = de1; 1847 } 1848 de->file_type = OCFS2_FT_UNKNOWN; 1849 if (blkno) { 1850 de->inode = cpu_to_le64(blkno); 1851 ocfs2_set_de_type(de, inode->i_mode); 1852 } else 1853 de->inode = 0; 1854 de->name_len = namelen; 1855 memcpy(de->name, name, namelen); 1856 1857 dir->i_version++; 1858 status = ocfs2_journal_dirty(handle, insert_bh); 1859 retval = 0; 1860 goto bail; 1861 } 1862 offset += le16_to_cpu(de->rec_len); 1863 de = (struct ocfs2_dir_entry *) ((char *) de + le16_to_cpu(de->rec_len)); 1864 } 1865 1866 /* when you think about it, the assert above should prevent us 1867 * from ever getting here. */ 1868 retval = -ENOSPC; 1869 bail: 1870 1871 mlog_exit(retval); 1872 return retval; 1873 } 1874 1875 1876 /* 1877 * ocfs2_delete_entry deletes a directory entry by merging it with the 1878 * previous entry 1879 */ 1880 static int ocfs2_delete_entry(handle_t *handle, 1881 struct inode *dir, 1882 struct ocfs2_dir_entry *de_del, 1883 struct buffer_head *bh) 1884 { 1885 struct ocfs2_dir_entry *de, *pde; 1886 int i, status = -ENOENT; 1887 1888 mlog_entry("(0x%p, 0x%p, 0x%p, 0x%p)\n", handle, dir, de_del, bh); 1889 1890 i = 0; 1891 pde = NULL; 1892 de = (struct ocfs2_dir_entry *) bh->b_data; 1893 while (i < bh->b_size) { 1894 if (!ocfs2_check_dir_entry(dir, de, bh, i)) { 1895 status = -EIO; 1896 mlog_errno(status); 1897 goto bail; 1898 } 1899 if (de == de_del) { 1900 status = ocfs2_journal_access(handle, dir, bh, 1901 OCFS2_JOURNAL_ACCESS_WRITE); 1902 if (status < 0) { 1903 status = -EIO; 1904 mlog_errno(status); 1905 goto bail; 1906 } 1907 if (pde) 1908 pde->rec_len = 1909 cpu_to_le16(le16_to_cpu(pde->rec_len) + 1910 le16_to_cpu(de->rec_len)); 1911 else 1912 de->inode = 0; 1913 dir->i_version++; 1914 status = ocfs2_journal_dirty(handle, bh); 1915 goto bail; 1916 } 1917 i += le16_to_cpu(de->rec_len); 1918 pde = de; 1919 de = (struct ocfs2_dir_entry *)((char *)de + le16_to_cpu(de->rec_len)); 1920 } 1921 bail: 1922 mlog_exit(status); 1923 return status; 1924 } 1925 1926 /* 1927 * Returns 0 if not found, -1 on failure, and 1 on success 1928 */ 1929 static int inline ocfs2_search_dirblock(struct buffer_head *bh, 1930 struct inode *dir, 1931 const char *name, int namelen, 1932 unsigned long offset, 1933 struct ocfs2_dir_entry **res_dir) 1934 { 1935 struct ocfs2_dir_entry *de; 1936 char *dlimit, *de_buf; 1937 int de_len; 1938 int ret = 0; 1939 1940 mlog_entry_void(); 1941 1942 de_buf = bh->b_data; 1943 dlimit = de_buf + dir->i_sb->s_blocksize; 1944 1945 while (de_buf < dlimit) { 1946 /* this code is executed quadratically often */ 1947 /* do minimal checking `by hand' */ 1948 1949 de = (struct ocfs2_dir_entry *) de_buf; 1950 1951 if (de_buf + namelen <= dlimit && 1952 ocfs2_match(namelen, name, de)) { 1953 /* found a match - just to be sure, do a full check */ 1954 if (!ocfs2_check_dir_entry(dir, de, bh, offset)) { 1955 ret = -1; 1956 goto bail; 1957 } 1958 *res_dir = de; 1959 ret = 1; 1960 goto bail; 1961 } 1962 1963 /* prevent looping on a bad block */ 1964 de_len = le16_to_cpu(de->rec_len); 1965 if (de_len <= 0) { 1966 ret = -1; 1967 goto bail; 1968 } 1969 1970 de_buf += de_len; 1971 offset += de_len; 1972 } 1973 1974 bail: 1975 mlog_exit(ret); 1976 return ret; 1977 } 1978 1979 struct buffer_head *ocfs2_find_entry(const char *name, int namelen, 1980 struct inode *dir, 1981 struct ocfs2_dir_entry **res_dir) 1982 { 1983 struct super_block *sb; 1984 struct buffer_head *bh_use[NAMEI_RA_SIZE]; 1985 struct buffer_head *bh, *ret = NULL; 1986 unsigned long start, block, b; 1987 int ra_max = 0; /* Number of bh's in the readahead 1988 buffer, bh_use[] */ 1989 int ra_ptr = 0; /* Current index into readahead 1990 buffer */ 1991 int num = 0; 1992 int nblocks, i, err; 1993 1994 mlog_entry_void(); 1995 1996 *res_dir = NULL; 1997 sb = dir->i_sb; 1998 1999 nblocks = i_size_read(dir) >> sb->s_blocksize_bits; 2000 start = OCFS2_I(dir)->ip_dir_start_lookup; 2001 if (start >= nblocks) 2002 start = 0; 2003 block = start; 2004 2005 restart: 2006 do { 2007 /* 2008 * We deal with the read-ahead logic here. 2009 */ 2010 if (ra_ptr >= ra_max) { 2011 /* Refill the readahead buffer */ 2012 ra_ptr = 0; 2013 b = block; 2014 for (ra_max = 0; ra_max < NAMEI_RA_SIZE; ra_max++) { 2015 /* 2016 * Terminate if we reach the end of the 2017 * directory and must wrap, or if our 2018 * search has finished at this block. 2019 */ 2020 if (b >= nblocks || (num && block == start)) { 2021 bh_use[ra_max] = NULL; 2022 break; 2023 } 2024 num++; 2025 2026 bh = ocfs2_bread(dir, b++, &err, 1); 2027 bh_use[ra_max] = bh; 2028 } 2029 } 2030 if ((bh = bh_use[ra_ptr++]) == NULL) 2031 goto next; 2032 wait_on_buffer(bh); 2033 if (!buffer_uptodate(bh)) { 2034 /* read error, skip block & hope for the best */ 2035 ocfs2_error(dir->i_sb, "reading directory %llu, " 2036 "offset %lu\n", 2037 (unsigned long long)OCFS2_I(dir)->ip_blkno, 2038 block); 2039 brelse(bh); 2040 goto next; 2041 } 2042 i = ocfs2_search_dirblock(bh, dir, name, namelen, 2043 block << sb->s_blocksize_bits, 2044 res_dir); 2045 if (i == 1) { 2046 OCFS2_I(dir)->ip_dir_start_lookup = block; 2047 ret = bh; 2048 goto cleanup_and_exit; 2049 } else { 2050 brelse(bh); 2051 if (i < 0) 2052 goto cleanup_and_exit; 2053 } 2054 next: 2055 if (++block >= nblocks) 2056 block = 0; 2057 } while (block != start); 2058 2059 /* 2060 * If the directory has grown while we were searching, then 2061 * search the last part of the directory before giving up. 2062 */ 2063 block = nblocks; 2064 nblocks = i_size_read(dir) >> sb->s_blocksize_bits; 2065 if (block < nblocks) { 2066 start = 0; 2067 goto restart; 2068 } 2069 2070 cleanup_and_exit: 2071 /* Clean up the read-ahead blocks */ 2072 for (; ra_ptr < ra_max; ra_ptr++) 2073 brelse(bh_use[ra_ptr]); 2074 2075 mlog_exit_ptr(ret); 2076 return ret; 2077 } 2078 2079 static int ocfs2_blkno_stringify(u64 blkno, char *name) 2080 { 2081 int status, namelen; 2082 2083 mlog_entry_void(); 2084 2085 namelen = snprintf(name, OCFS2_ORPHAN_NAMELEN + 1, "%016llx", 2086 (long long)blkno); 2087 if (namelen <= 0) { 2088 if (namelen) 2089 status = namelen; 2090 else 2091 status = -EINVAL; 2092 mlog_errno(status); 2093 goto bail; 2094 } 2095 if (namelen != OCFS2_ORPHAN_NAMELEN) { 2096 status = -EINVAL; 2097 mlog_errno(status); 2098 goto bail; 2099 } 2100 2101 mlog(0, "built filename '%s' for orphan dir (len=%d)\n", name, 2102 namelen); 2103 2104 status = 0; 2105 bail: 2106 mlog_exit(status); 2107 return status; 2108 } 2109 2110 static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb, 2111 struct inode **ret_orphan_dir, 2112 struct inode *inode, 2113 char *name, 2114 struct buffer_head **de_bh) 2115 { 2116 struct inode *orphan_dir_inode; 2117 struct buffer_head *orphan_dir_bh = NULL; 2118 int status = 0; 2119 2120 status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name); 2121 if (status < 0) { 2122 mlog_errno(status); 2123 return status; 2124 } 2125 2126 orphan_dir_inode = ocfs2_get_system_file_inode(osb, 2127 ORPHAN_DIR_SYSTEM_INODE, 2128 osb->slot_num); 2129 if (!orphan_dir_inode) { 2130 status = -ENOENT; 2131 mlog_errno(status); 2132 return status; 2133 } 2134 2135 mutex_lock(&orphan_dir_inode->i_mutex); 2136 2137 status = ocfs2_meta_lock(orphan_dir_inode, &orphan_dir_bh, 1); 2138 if (status < 0) { 2139 mlog_errno(status); 2140 goto leave; 2141 } 2142 2143 status = ocfs2_prepare_dir_for_insert(osb, orphan_dir_inode, 2144 orphan_dir_bh, name, 2145 OCFS2_ORPHAN_NAMELEN, de_bh); 2146 if (status < 0) { 2147 ocfs2_meta_unlock(orphan_dir_inode, 1); 2148 2149 mlog_errno(status); 2150 goto leave; 2151 } 2152 2153 *ret_orphan_dir = orphan_dir_inode; 2154 2155 leave: 2156 if (status) { 2157 mutex_unlock(&orphan_dir_inode->i_mutex); 2158 iput(orphan_dir_inode); 2159 } 2160 2161 if (orphan_dir_bh) 2162 brelse(orphan_dir_bh); 2163 2164 mlog_exit(status); 2165 return status; 2166 } 2167 2168 static int ocfs2_orphan_add(struct ocfs2_super *osb, 2169 handle_t *handle, 2170 struct inode *inode, 2171 struct ocfs2_dinode *fe, 2172 char *name, 2173 struct buffer_head *de_bh, 2174 struct inode *orphan_dir_inode) 2175 { 2176 struct buffer_head *orphan_dir_bh = NULL; 2177 int status = 0; 2178 struct ocfs2_dinode *orphan_fe; 2179 2180 mlog_entry("(inode->i_ino = %lu)\n", inode->i_ino); 2181 2182 status = ocfs2_read_block(osb, 2183 OCFS2_I(orphan_dir_inode)->ip_blkno, 2184 &orphan_dir_bh, OCFS2_BH_CACHED, 2185 orphan_dir_inode); 2186 if (status < 0) { 2187 mlog_errno(status); 2188 goto leave; 2189 } 2190 2191 status = ocfs2_journal_access(handle, orphan_dir_inode, orphan_dir_bh, 2192 OCFS2_JOURNAL_ACCESS_WRITE); 2193 if (status < 0) { 2194 mlog_errno(status); 2195 goto leave; 2196 } 2197 2198 /* we're a cluster, and nlink can change on disk from 2199 * underneath us... */ 2200 orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data; 2201 if (S_ISDIR(inode->i_mode)) 2202 le16_add_cpu(&orphan_fe->i_links_count, 1); 2203 orphan_dir_inode->i_nlink = le16_to_cpu(orphan_fe->i_links_count); 2204 2205 status = ocfs2_journal_dirty(handle, orphan_dir_bh); 2206 if (status < 0) { 2207 mlog_errno(status); 2208 goto leave; 2209 } 2210 2211 status = __ocfs2_add_entry(handle, orphan_dir_inode, name, 2212 OCFS2_ORPHAN_NAMELEN, inode, 2213 OCFS2_I(inode)->ip_blkno, 2214 orphan_dir_bh, de_bh); 2215 if (status < 0) { 2216 mlog_errno(status); 2217 goto leave; 2218 } 2219 2220 le32_add_cpu(&fe->i_flags, OCFS2_ORPHANED_FL); 2221 2222 /* Record which orphan dir our inode now resides 2223 * in. delete_inode will use this to determine which orphan 2224 * dir to lock. */ 2225 spin_lock(&OCFS2_I(inode)->ip_lock); 2226 OCFS2_I(inode)->ip_orphaned_slot = osb->slot_num; 2227 spin_unlock(&OCFS2_I(inode)->ip_lock); 2228 2229 mlog(0, "Inode %llu orphaned in slot %d\n", 2230 (unsigned long long)OCFS2_I(inode)->ip_blkno, osb->slot_num); 2231 2232 leave: 2233 if (orphan_dir_bh) 2234 brelse(orphan_dir_bh); 2235 2236 mlog_exit(status); 2237 return status; 2238 } 2239 2240 /* unlike orphan_add, we expect the orphan dir to already be locked here. */ 2241 int ocfs2_orphan_del(struct ocfs2_super *osb, 2242 handle_t *handle, 2243 struct inode *orphan_dir_inode, 2244 struct inode *inode, 2245 struct buffer_head *orphan_dir_bh) 2246 { 2247 char name[OCFS2_ORPHAN_NAMELEN + 1]; 2248 struct ocfs2_dinode *orphan_fe; 2249 int status = 0; 2250 struct buffer_head *target_de_bh = NULL; 2251 struct ocfs2_dir_entry *target_de = NULL; 2252 2253 mlog_entry_void(); 2254 2255 status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name); 2256 if (status < 0) { 2257 mlog_errno(status); 2258 goto leave; 2259 } 2260 2261 mlog(0, "removing '%s' from orphan dir %llu (namelen=%d)\n", 2262 name, (unsigned long long)OCFS2_I(orphan_dir_inode)->ip_blkno, 2263 OCFS2_ORPHAN_NAMELEN); 2264 2265 /* find it's spot in the orphan directory */ 2266 target_de_bh = ocfs2_find_entry(name, OCFS2_ORPHAN_NAMELEN, 2267 orphan_dir_inode, &target_de); 2268 if (!target_de_bh) { 2269 status = -ENOENT; 2270 mlog_errno(status); 2271 goto leave; 2272 } 2273 2274 /* remove it from the orphan directory */ 2275 status = ocfs2_delete_entry(handle, orphan_dir_inode, target_de, 2276 target_de_bh); 2277 if (status < 0) { 2278 mlog_errno(status); 2279 goto leave; 2280 } 2281 2282 status = ocfs2_journal_access(handle,orphan_dir_inode, orphan_dir_bh, 2283 OCFS2_JOURNAL_ACCESS_WRITE); 2284 if (status < 0) { 2285 mlog_errno(status); 2286 goto leave; 2287 } 2288 2289 /* do the i_nlink dance! :) */ 2290 orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data; 2291 if (S_ISDIR(inode->i_mode)) 2292 le16_add_cpu(&orphan_fe->i_links_count, -1); 2293 orphan_dir_inode->i_nlink = le16_to_cpu(orphan_fe->i_links_count); 2294 2295 status = ocfs2_journal_dirty(handle, orphan_dir_bh); 2296 if (status < 0) { 2297 mlog_errno(status); 2298 goto leave; 2299 } 2300 2301 leave: 2302 if (target_de_bh) 2303 brelse(target_de_bh); 2304 2305 mlog_exit(status); 2306 return status; 2307 } 2308 2309 const struct inode_operations ocfs2_dir_iops = { 2310 .create = ocfs2_create, 2311 .lookup = ocfs2_lookup, 2312 .link = ocfs2_link, 2313 .unlink = ocfs2_unlink, 2314 .rmdir = ocfs2_unlink, 2315 .symlink = ocfs2_symlink, 2316 .mkdir = ocfs2_mkdir, 2317 .mknod = ocfs2_mknod, 2318 .rename = ocfs2_rename, 2319 .setattr = ocfs2_setattr, 2320 .getattr = ocfs2_getattr, 2321 .permission = ocfs2_permission, 2322 }; 2323