1 /* 2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 3 * Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved. 4 * 5 * This copyrighted material is made available to anyone wishing to use, 6 * modify, copy, or redistribute it subject to the terms and conditions 7 * of the GNU General Public License v.2. 8 */ 9 10 #include <linux/sched.h> 11 #include <linux/slab.h> 12 #include <linux/spinlock.h> 13 #include <linux/completion.h> 14 #include <linux/buffer_head.h> 15 #include <linux/posix_acl.h> 16 #include <linux/sort.h> 17 #include <linux/gfs2_ondisk.h> 18 #include <asm/semaphore.h> 19 20 #include "gfs2.h" 21 #include "lm_interface.h" 22 #include "incore.h" 23 #include "acl.h" 24 #include "bmap.h" 25 #include "dir.h" 26 #include "eattr.h" 27 #include "glock.h" 28 #include "glops.h" 29 #include "inode.h" 30 #include "log.h" 31 #include "meta_io.h" 32 #include "ops_address.h" 33 #include "ops_file.h" 34 #include "ops_inode.h" 35 #include "quota.h" 36 #include "rgrp.h" 37 #include "trans.h" 38 #include "unlinked.h" 39 #include "util.h" 40 41 /** 42 * inode_attr_in - Copy attributes from the dinode into the VFS inode 43 * @ip: The GFS2 inode (with embedded disk inode data) 44 * @inode: The Linux VFS inode 45 * 46 */ 47 48 static void inode_attr_in(struct gfs2_inode *ip, struct inode *inode) 49 { 50 inode->i_ino = ip->i_num.no_formal_ino; 51 52 switch (ip->i_di.di_mode & S_IFMT) { 53 case S_IFBLK: 54 case S_IFCHR: 55 inode->i_rdev = MKDEV(ip->i_di.di_major, ip->i_di.di_minor); 56 break; 57 default: 58 inode->i_rdev = 0; 59 break; 60 }; 61 62 inode->i_mode = ip->i_di.di_mode; 63 inode->i_nlink = ip->i_di.di_nlink; 64 inode->i_uid = ip->i_di.di_uid; 65 inode->i_gid = ip->i_di.di_gid; 66 i_size_write(inode, ip->i_di.di_size); 67 inode->i_atime.tv_sec = ip->i_di.di_atime; 68 inode->i_mtime.tv_sec = ip->i_di.di_mtime; 69 inode->i_ctime.tv_sec = ip->i_di.di_ctime; 70 inode->i_atime.tv_nsec = 0; 71 inode->i_mtime.tv_nsec = 0; 72 inode->i_ctime.tv_nsec = 0; 73 inode->i_blksize = PAGE_SIZE; 74 inode->i_blocks = ip->i_di.di_blocks << 75 (ip->i_sbd->sd_sb.sb_bsize_shift - GFS2_BASIC_BLOCK_SHIFT); 76 77 if (ip->i_di.di_flags & GFS2_DIF_IMMUTABLE) 78 inode->i_flags |= S_IMMUTABLE; 79 else 80 inode->i_flags &= ~S_IMMUTABLE; 81 82 if (ip->i_di.di_flags & GFS2_DIF_APPENDONLY) 83 inode->i_flags |= S_APPEND; 84 else 85 inode->i_flags &= ~S_APPEND; 86 } 87 88 /** 89 * gfs2_inode_attr_in - Copy attributes from the dinode into the VFS inode 90 * @ip: The GFS2 inode (with embedded disk inode data) 91 * 92 */ 93 94 void gfs2_inode_attr_in(struct gfs2_inode *ip) 95 { 96 struct inode *inode; 97 98 inode = gfs2_ip2v_lookup(ip); 99 if (inode) { 100 inode_attr_in(ip, inode); 101 iput(inode); 102 } 103 } 104 105 /** 106 * gfs2_inode_attr_out - Copy attributes from VFS inode into the dinode 107 * @ip: The GFS2 inode 108 * 109 * Only copy out the attributes that we want the VFS layer 110 * to be able to modify. 111 */ 112 113 void gfs2_inode_attr_out(struct gfs2_inode *ip) 114 { 115 struct inode *inode = ip->i_vnode; 116 117 gfs2_assert_withdraw(ip->i_sbd, 118 (ip->i_di.di_mode & S_IFMT) == (inode->i_mode & S_IFMT)); 119 ip->i_di.di_mode = inode->i_mode; 120 ip->i_di.di_uid = inode->i_uid; 121 ip->i_di.di_gid = inode->i_gid; 122 ip->i_di.di_atime = inode->i_atime.tv_sec; 123 ip->i_di.di_mtime = inode->i_mtime.tv_sec; 124 ip->i_di.di_ctime = inode->i_ctime.tv_sec; 125 } 126 127 /** 128 * gfs2_ip2v_lookup - Get the struct inode for a struct gfs2_inode 129 * @ip: the struct gfs2_inode to get the struct inode for 130 * 131 * Returns: A VFS inode, or NULL if none 132 */ 133 134 struct inode *gfs2_ip2v_lookup(struct gfs2_inode *ip) 135 { 136 struct inode *inode = NULL; 137 138 gfs2_assert_warn(ip->i_sbd, test_bit(GIF_MIN_INIT, &ip->i_flags)); 139 140 spin_lock(&ip->i_spin); 141 if (ip->i_vnode) 142 inode = igrab(ip->i_vnode); 143 spin_unlock(&ip->i_spin); 144 145 return inode; 146 } 147 148 /** 149 * gfs2_ip2v - Get/Create a struct inode for a struct gfs2_inode 150 * @ip: the struct gfs2_inode to get the struct inode for 151 * 152 * Returns: A VFS inode, or NULL if no mem 153 */ 154 155 struct inode *gfs2_ip2v(struct gfs2_inode *ip) 156 { 157 struct inode *inode, *tmp; 158 159 inode = gfs2_ip2v_lookup(ip); 160 if (inode) 161 return inode; 162 163 tmp = new_inode(ip->i_sbd->sd_vfs); 164 if (!tmp) 165 return NULL; 166 167 inode_attr_in(ip, tmp); 168 169 if (S_ISREG(ip->i_di.di_mode)) { 170 tmp->i_op = &gfs2_file_iops; 171 tmp->i_fop = &gfs2_file_fops; 172 tmp->i_mapping->a_ops = &gfs2_file_aops; 173 } else if (S_ISDIR(ip->i_di.di_mode)) { 174 tmp->i_op = &gfs2_dir_iops; 175 tmp->i_fop = &gfs2_dir_fops; 176 } else if (S_ISLNK(ip->i_di.di_mode)) { 177 tmp->i_op = &gfs2_symlink_iops; 178 } else { 179 tmp->i_op = &gfs2_dev_iops; 180 init_special_inode(tmp, tmp->i_mode, tmp->i_rdev); 181 } 182 183 tmp->u.generic_ip = NULL; 184 185 for (;;) { 186 spin_lock(&ip->i_spin); 187 if (!ip->i_vnode) 188 break; 189 inode = igrab(ip->i_vnode); 190 spin_unlock(&ip->i_spin); 191 192 if (inode) { 193 iput(tmp); 194 return inode; 195 } 196 yield(); 197 } 198 199 inode = tmp; 200 201 gfs2_inode_hold(ip); 202 ip->i_vnode = inode; 203 inode->u.generic_ip = ip; 204 205 spin_unlock(&ip->i_spin); 206 207 insert_inode_hash(inode); 208 209 return inode; 210 } 211 212 static int iget_test(struct inode *inode, void *opaque) 213 { 214 struct gfs2_inode *ip = inode->u.generic_ip; 215 struct gfs2_inum *inum = (struct gfs2_inum *)opaque; 216 217 if (ip && ip->i_num.no_addr == inum->no_addr) 218 return 1; 219 220 return 0; 221 } 222 223 struct inode *gfs2_iget(struct super_block *sb, struct gfs2_inum *inum) 224 { 225 return ilookup5(sb, (unsigned long)inum->no_formal_ino, 226 iget_test, inum); 227 } 228 229 void gfs2_inode_min_init(struct gfs2_inode *ip, unsigned int type) 230 { 231 spin_lock(&ip->i_spin); 232 if (!test_and_set_bit(GIF_MIN_INIT, &ip->i_flags)) { 233 ip->i_di.di_nlink = 1; 234 ip->i_di.di_mode = DT2IF(type); 235 } 236 spin_unlock(&ip->i_spin); 237 } 238 239 /** 240 * gfs2_inode_refresh - Refresh the incore copy of the dinode 241 * @ip: The GFS2 inode 242 * 243 * Returns: errno 244 */ 245 246 int gfs2_inode_refresh(struct gfs2_inode *ip) 247 { 248 struct buffer_head *dibh; 249 int error; 250 251 error = gfs2_meta_inode_buffer(ip, &dibh); 252 if (error) 253 return error; 254 255 if (gfs2_metatype_check(ip->i_sbd, dibh, GFS2_METATYPE_DI)) { 256 brelse(dibh); 257 return -EIO; 258 } 259 260 spin_lock(&ip->i_spin); 261 gfs2_dinode_in(&ip->i_di, dibh->b_data); 262 set_bit(GIF_MIN_INIT, &ip->i_flags); 263 spin_unlock(&ip->i_spin); 264 265 brelse(dibh); 266 267 if (ip->i_num.no_addr != ip->i_di.di_num.no_addr) { 268 if (gfs2_consist_inode(ip)) 269 gfs2_dinode_print(&ip->i_di); 270 return -EIO; 271 } 272 if (ip->i_num.no_formal_ino != ip->i_di.di_num.no_formal_ino) 273 return -ESTALE; 274 275 ip->i_vn = ip->i_gl->gl_vn; 276 277 return 0; 278 } 279 280 /** 281 * inode_create - create a struct gfs2_inode 282 * @i_gl: The glock covering the inode 283 * @inum: The inode number 284 * @io_gl: the iopen glock to acquire/hold (using holder in new gfs2_inode) 285 * @io_state: the state the iopen glock should be acquired in 286 * @ipp: pointer to put the returned inode in 287 * 288 * Returns: errno 289 */ 290 291 static int inode_create(struct gfs2_glock *i_gl, const struct gfs2_inum *inum, 292 struct gfs2_glock *io_gl, unsigned int io_state, 293 struct gfs2_inode **ipp) 294 { 295 struct gfs2_sbd *sdp = i_gl->gl_sbd; 296 struct gfs2_inode *ip; 297 int error = 0; 298 299 ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL); 300 if (!ip) 301 return -ENOMEM; 302 memset(ip, 0, sizeof(struct gfs2_inode)); 303 304 ip->i_num = *inum; 305 306 atomic_set(&ip->i_count, 1); 307 308 ip->i_vn = i_gl->gl_vn - 1; 309 310 ip->i_gl = i_gl; 311 ip->i_sbd = sdp; 312 313 spin_lock_init(&ip->i_spin); 314 init_rwsem(&ip->i_rw_mutex); 315 316 ip->i_greedy = gfs2_tune_get(sdp, gt_greedy_default); 317 318 error = gfs2_glock_nq_init(io_gl, 319 io_state, GL_LOCAL_EXCL | GL_EXACT, 320 &ip->i_iopen_gh); 321 if (error) 322 goto fail; 323 ip->i_iopen_gh.gh_owner = NULL; 324 325 spin_lock(&io_gl->gl_spin); 326 gfs2_glock_hold(i_gl); 327 io_gl->gl_object = i_gl; 328 spin_unlock(&io_gl->gl_spin); 329 330 gfs2_glock_hold(i_gl); 331 i_gl->gl_object = ip; 332 333 atomic_inc(&sdp->sd_inode_count); 334 335 *ipp = ip; 336 337 return 0; 338 339 fail: 340 gfs2_meta_cache_flush(ip); 341 kmem_cache_free(gfs2_inode_cachep, ip); 342 *ipp = NULL; 343 344 return error; 345 } 346 347 /** 348 * gfs2_inode_get - Create or get a reference on an inode 349 * @i_gl: The glock covering the inode 350 * @inum: The inode number 351 * @create: 352 * @ipp: pointer to put the returned inode in 353 * 354 * Returns: errno 355 */ 356 357 int gfs2_inode_get(struct gfs2_glock *i_gl, const struct gfs2_inum *inum, 358 int create, struct gfs2_inode **ipp) 359 { 360 struct gfs2_sbd *sdp = i_gl->gl_sbd; 361 struct gfs2_glock *io_gl; 362 int error = 0; 363 364 gfs2_glmutex_lock(i_gl); 365 366 *ipp = i_gl->gl_object; 367 if (*ipp) { 368 error = -ESTALE; 369 if ((*ipp)->i_num.no_formal_ino != inum->no_formal_ino) 370 goto out; 371 atomic_inc(&(*ipp)->i_count); 372 error = 0; 373 goto out; 374 } 375 376 if (!create) 377 goto out; 378 379 error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_iopen_glops, 380 CREATE, &io_gl); 381 if (!error) { 382 error = inode_create(i_gl, inum, io_gl, LM_ST_SHARED, ipp); 383 gfs2_glock_put(io_gl); 384 } 385 386 out: 387 gfs2_glmutex_unlock(i_gl); 388 389 return error; 390 } 391 392 void gfs2_inode_hold(struct gfs2_inode *ip) 393 { 394 gfs2_assert(ip->i_sbd, atomic_read(&ip->i_count) > 0); 395 atomic_inc(&ip->i_count); 396 } 397 398 void gfs2_inode_put(struct gfs2_inode *ip) 399 { 400 gfs2_assert(ip->i_sbd, atomic_read(&ip->i_count) > 0); 401 atomic_dec(&ip->i_count); 402 } 403 404 void gfs2_inode_destroy(struct gfs2_inode *ip) 405 { 406 struct gfs2_sbd *sdp = ip->i_sbd; 407 struct gfs2_glock *io_gl = ip->i_iopen_gh.gh_gl; 408 struct gfs2_glock *i_gl = ip->i_gl; 409 410 gfs2_assert_warn(sdp, !atomic_read(&ip->i_count)); 411 gfs2_assert(sdp, io_gl->gl_object == i_gl); 412 413 spin_lock(&io_gl->gl_spin); 414 io_gl->gl_object = NULL; 415 gfs2_glock_put(i_gl); 416 spin_unlock(&io_gl->gl_spin); 417 418 gfs2_glock_dq_uninit(&ip->i_iopen_gh); 419 420 gfs2_meta_cache_flush(ip); 421 kmem_cache_free(gfs2_inode_cachep, ip); 422 423 i_gl->gl_object = NULL; 424 gfs2_glock_put(i_gl); 425 426 atomic_dec(&sdp->sd_inode_count); 427 } 428 429 static int dinode_dealloc(struct gfs2_inode *ip, struct gfs2_unlinked *ul) 430 { 431 struct gfs2_sbd *sdp = ip->i_sbd; 432 struct gfs2_alloc *al; 433 struct gfs2_rgrpd *rgd; 434 int error; 435 436 if (ip->i_di.di_blocks != 1) { 437 if (gfs2_consist_inode(ip)) 438 gfs2_dinode_print(&ip->i_di); 439 return -EIO; 440 } 441 442 al = gfs2_alloc_get(ip); 443 444 error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); 445 if (error) 446 goto out; 447 448 error = gfs2_rindex_hold(sdp, &al->al_ri_gh); 449 if (error) 450 goto out_qs; 451 452 rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr); 453 if (!rgd) { 454 gfs2_consist_inode(ip); 455 error = -EIO; 456 goto out_rindex_relse; 457 } 458 459 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, 460 &al->al_rgd_gh); 461 if (error) 462 goto out_rindex_relse; 463 464 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_UNLINKED + 465 RES_STATFS + RES_QUOTA, 1); 466 if (error) 467 goto out_rg_gunlock; 468 469 gfs2_trans_add_gl(ip->i_gl); 470 471 gfs2_free_di(rgd, ip); 472 473 error = gfs2_unlinked_ondisk_rm(sdp, ul); 474 475 gfs2_trans_end(sdp); 476 clear_bit(GLF_STICKY, &ip->i_gl->gl_flags); 477 478 out_rg_gunlock: 479 gfs2_glock_dq_uninit(&al->al_rgd_gh); 480 481 out_rindex_relse: 482 gfs2_glock_dq_uninit(&al->al_ri_gh); 483 484 out_qs: 485 gfs2_quota_unhold(ip); 486 487 out: 488 gfs2_alloc_put(ip); 489 490 return error; 491 } 492 493 /** 494 * inode_dealloc - Deallocate all on-disk blocks for an inode (dinode) 495 * @sdp: the filesystem 496 * @inum: the inode number to deallocate 497 * @io_gh: a holder for the iopen glock for this inode 498 * 499 * Returns: errno 500 */ 501 502 static int inode_dealloc(struct gfs2_sbd *sdp, struct gfs2_unlinked *ul, 503 struct gfs2_holder *io_gh) 504 { 505 struct gfs2_inode *ip; 506 struct gfs2_holder i_gh; 507 int error; 508 509 error = gfs2_glock_nq_num(sdp, 510 ul->ul_ut.ut_inum.no_addr, &gfs2_inode_glops, 511 LM_ST_EXCLUSIVE, 0, &i_gh); 512 if (error) 513 return error; 514 515 /* We reacquire the iopen lock here to avoid a race with the NFS server 516 calling gfs2_read_inode() with the inode number of a inode we're in 517 the process of deallocating. And we can't keep our hold on the lock 518 from inode_dealloc_init() for deadlock reasons. */ 519 520 gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY, io_gh); 521 error = gfs2_glock_nq(io_gh); 522 switch (error) { 523 case 0: 524 break; 525 case GLR_TRYFAILED: 526 error = 1; 527 default: 528 goto out; 529 } 530 531 gfs2_assert_warn(sdp, !i_gh.gh_gl->gl_object); 532 error = inode_create(i_gh.gh_gl, &ul->ul_ut.ut_inum, io_gh->gh_gl, 533 LM_ST_EXCLUSIVE, &ip); 534 535 gfs2_glock_dq(io_gh); 536 537 if (error) 538 goto out; 539 540 error = gfs2_inode_refresh(ip); 541 if (error) 542 goto out_iput; 543 544 if (ip->i_di.di_nlink) { 545 if (gfs2_consist_inode(ip)) 546 gfs2_dinode_print(&ip->i_di); 547 error = -EIO; 548 goto out_iput; 549 } 550 551 if (S_ISDIR(ip->i_di.di_mode) && 552 (ip->i_di.di_flags & GFS2_DIF_EXHASH)) { 553 error = gfs2_dir_exhash_dealloc(ip); 554 if (error) 555 goto out_iput; 556 } 557 558 if (ip->i_di.di_eattr) { 559 error = gfs2_ea_dealloc(ip); 560 if (error) 561 goto out_iput; 562 } 563 564 if (!gfs2_is_stuffed(ip)) { 565 error = gfs2_file_dealloc(ip); 566 if (error) 567 goto out_iput; 568 } 569 570 error = dinode_dealloc(ip, ul); 571 if (error) 572 goto out_iput; 573 574 out_iput: 575 gfs2_glmutex_lock(i_gh.gh_gl); 576 gfs2_inode_put(ip); 577 gfs2_inode_destroy(ip); 578 gfs2_glmutex_unlock(i_gh.gh_gl); 579 580 out: 581 gfs2_glock_dq_uninit(&i_gh); 582 583 return error; 584 } 585 586 /** 587 * try_inode_dealloc - Try to deallocate an inode and all its blocks 588 * @sdp: the filesystem 589 * 590 * Returns: 0 on success, -errno on error, 1 on busy (inode open) 591 */ 592 593 static int try_inode_dealloc(struct gfs2_sbd *sdp, struct gfs2_unlinked *ul) 594 { 595 struct gfs2_holder io_gh; 596 int error = 0; 597 598 gfs2_try_toss_inode(sdp, &ul->ul_ut.ut_inum); 599 600 error = gfs2_glock_nq_num(sdp, 601 ul->ul_ut.ut_inum.no_addr, &gfs2_iopen_glops, 602 LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB, &io_gh); 603 switch (error) { 604 case 0: 605 break; 606 case GLR_TRYFAILED: 607 return 1; 608 default: 609 return error; 610 } 611 612 gfs2_glock_dq(&io_gh); 613 error = inode_dealloc(sdp, ul, &io_gh); 614 gfs2_holder_uninit(&io_gh); 615 616 return error; 617 } 618 619 static int inode_dealloc_uninit(struct gfs2_sbd *sdp, struct gfs2_unlinked *ul) 620 { 621 struct gfs2_rgrpd *rgd; 622 struct gfs2_holder ri_gh, rgd_gh; 623 int error; 624 625 error = gfs2_rindex_hold(sdp, &ri_gh); 626 if (error) 627 return error; 628 629 rgd = gfs2_blk2rgrpd(sdp, ul->ul_ut.ut_inum.no_addr); 630 if (!rgd) { 631 gfs2_consist(sdp); 632 error = -EIO; 633 goto out; 634 } 635 636 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rgd_gh); 637 if (error) 638 goto out; 639 640 error = gfs2_trans_begin(sdp, 641 RES_RG_BIT + RES_UNLINKED + RES_STATFS, 642 0); 643 if (error) 644 goto out_gunlock; 645 646 gfs2_free_uninit_di(rgd, ul->ul_ut.ut_inum.no_addr); 647 gfs2_unlinked_ondisk_rm(sdp, ul); 648 649 gfs2_trans_end(sdp); 650 651 out_gunlock: 652 gfs2_glock_dq_uninit(&rgd_gh); 653 out: 654 gfs2_glock_dq_uninit(&ri_gh); 655 656 return error; 657 } 658 659 int gfs2_inode_dealloc(struct gfs2_sbd *sdp, struct gfs2_unlinked *ul) 660 { 661 if (ul->ul_ut.ut_flags & GFS2_UTF_UNINIT) 662 return inode_dealloc_uninit(sdp, ul); 663 else 664 return try_inode_dealloc(sdp, ul); 665 } 666 667 /** 668 * gfs2_change_nlink - Change nlink count on inode 669 * @ip: The GFS2 inode 670 * @diff: The change in the nlink count required 671 * 672 * Returns: errno 673 */ 674 675 int gfs2_change_nlink(struct gfs2_inode *ip, int diff) 676 { 677 struct buffer_head *dibh; 678 uint32_t nlink; 679 int error; 680 681 nlink = ip->i_di.di_nlink + diff; 682 683 /* If we are reducing the nlink count, but the new value ends up being 684 bigger than the old one, we must have underflowed. */ 685 if (diff < 0 && nlink > ip->i_di.di_nlink) { 686 if (gfs2_consist_inode(ip)) 687 gfs2_dinode_print(&ip->i_di); 688 return -EIO; 689 } 690 691 error = gfs2_meta_inode_buffer(ip, &dibh); 692 if (error) 693 return error; 694 695 ip->i_di.di_nlink = nlink; 696 ip->i_di.di_ctime = get_seconds(); 697 698 gfs2_trans_add_bh(ip->i_gl, dibh, 1); 699 gfs2_dinode_out(&ip->i_di, dibh->b_data); 700 brelse(dibh); 701 702 return 0; 703 } 704 705 /** 706 * gfs2_lookupi - Look up a filename in a directory and return its inode 707 * @d_gh: An initialized holder for the directory glock 708 * @name: The name of the inode to look for 709 * @is_root: If 1, ignore the caller's permissions 710 * @i_gh: An uninitialized holder for the new inode glock 711 * 712 * There will always be a vnode (Linux VFS inode) for the d_gh inode unless 713 * @is_root is true. 714 * 715 * Returns: errno 716 */ 717 718 int gfs2_lookupi(struct inode *dir, struct qstr *name, int is_root, 719 struct inode **inodep) 720 { 721 struct super_block *sb = dir->i_sb; 722 struct gfs2_inode *ipp; 723 struct gfs2_inode *dip = dir->u.generic_ip; 724 struct gfs2_sbd *sdp = dip->i_sbd; 725 struct gfs2_holder d_gh; 726 struct gfs2_inum inum; 727 unsigned int type; 728 struct gfs2_glock *gl; 729 int error = 0; 730 731 *inodep = NULL; 732 733 if (!name->len || name->len > GFS2_FNAMESIZE) 734 return -ENAMETOOLONG; 735 736 if (gfs2_filecmp(name, ".", 1) || 737 (gfs2_filecmp(name, "..", 2) && dir == sb->s_root->d_inode)) { 738 gfs2_inode_hold(dip); 739 ipp = dip; 740 goto done; 741 } 742 743 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); 744 if (error) 745 return error; 746 747 if (!is_root) { 748 error = gfs2_repermission(dip->i_vnode, MAY_EXEC, NULL); 749 if (error) 750 goto out; 751 } 752 753 error = gfs2_dir_search(dip, name, &inum, &type); 754 if (error) 755 goto out; 756 757 error = gfs2_glock_get(sdp, inum.no_addr, &gfs2_inode_glops, 758 CREATE, &gl); 759 if (error) 760 goto out; 761 762 error = gfs2_inode_get(gl, &inum, CREATE, &ipp); 763 if (!error) 764 gfs2_inode_min_init(ipp, type); 765 766 gfs2_glock_put(gl); 767 768 out: 769 gfs2_glock_dq_uninit(&d_gh); 770 done: 771 if (error == 0) { 772 *inodep = gfs2_ip2v(ipp); 773 if (!*inodep) 774 error = -ENOMEM; 775 gfs2_inode_put(ipp); 776 } 777 return error; 778 } 779 780 static int pick_formal_ino_1(struct gfs2_sbd *sdp, uint64_t *formal_ino) 781 { 782 struct gfs2_inode *ip = sdp->sd_ir_inode->u.generic_ip; 783 struct buffer_head *bh; 784 struct gfs2_inum_range ir; 785 int error; 786 787 error = gfs2_trans_begin(sdp, RES_DINODE, 0); 788 if (error) 789 return error; 790 mutex_lock(&sdp->sd_inum_mutex); 791 792 error = gfs2_meta_inode_buffer(ip, &bh); 793 if (error) { 794 mutex_unlock(&sdp->sd_inum_mutex); 795 gfs2_trans_end(sdp); 796 return error; 797 } 798 799 gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode)); 800 801 if (ir.ir_length) { 802 *formal_ino = ir.ir_start++; 803 ir.ir_length--; 804 gfs2_trans_add_bh(ip->i_gl, bh, 1); 805 gfs2_inum_range_out(&ir, 806 bh->b_data + sizeof(struct gfs2_dinode)); 807 brelse(bh); 808 mutex_unlock(&sdp->sd_inum_mutex); 809 gfs2_trans_end(sdp); 810 return 0; 811 } 812 813 brelse(bh); 814 815 mutex_unlock(&sdp->sd_inum_mutex); 816 gfs2_trans_end(sdp); 817 818 return 1; 819 } 820 821 static int pick_formal_ino_2(struct gfs2_sbd *sdp, uint64_t *formal_ino) 822 { 823 struct gfs2_inode *ip = sdp->sd_ir_inode->u.generic_ip; 824 struct gfs2_inode *m_ip = sdp->sd_inum_inode->u.generic_ip; 825 struct gfs2_holder gh; 826 struct buffer_head *bh; 827 struct gfs2_inum_range ir; 828 int error; 829 830 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 831 if (error) 832 return error; 833 834 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0); 835 if (error) 836 goto out; 837 mutex_lock(&sdp->sd_inum_mutex); 838 839 error = gfs2_meta_inode_buffer(ip, &bh); 840 if (error) 841 goto out_end_trans; 842 843 gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode)); 844 845 if (!ir.ir_length) { 846 struct buffer_head *m_bh; 847 uint64_t x, y; 848 849 error = gfs2_meta_inode_buffer(m_ip, &m_bh); 850 if (error) 851 goto out_brelse; 852 853 x = *(uint64_t *)(m_bh->b_data + sizeof(struct gfs2_dinode)); 854 x = y = be64_to_cpu(x); 855 ir.ir_start = x; 856 ir.ir_length = GFS2_INUM_QUANTUM; 857 x += GFS2_INUM_QUANTUM; 858 if (x < y) 859 gfs2_consist_inode(m_ip); 860 x = cpu_to_be64(x); 861 gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1); 862 *(uint64_t *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = x; 863 864 brelse(m_bh); 865 } 866 867 *formal_ino = ir.ir_start++; 868 ir.ir_length--; 869 870 gfs2_trans_add_bh(ip->i_gl, bh, 1); 871 gfs2_inum_range_out(&ir, bh->b_data + sizeof(struct gfs2_dinode)); 872 873 out_brelse: 874 brelse(bh); 875 876 out_end_trans: 877 mutex_unlock(&sdp->sd_inum_mutex); 878 gfs2_trans_end(sdp); 879 880 out: 881 gfs2_glock_dq_uninit(&gh); 882 883 return error; 884 } 885 886 static int pick_formal_ino(struct gfs2_sbd *sdp, uint64_t *inum) 887 { 888 int error; 889 890 error = pick_formal_ino_1(sdp, inum); 891 if (error <= 0) 892 return error; 893 894 error = pick_formal_ino_2(sdp, inum); 895 896 return error; 897 } 898 899 /** 900 * create_ok - OK to create a new on-disk inode here? 901 * @dip: Directory in which dinode is to be created 902 * @name: Name of new dinode 903 * @mode: 904 * 905 * Returns: errno 906 */ 907 908 static int create_ok(struct gfs2_inode *dip, struct qstr *name, 909 unsigned int mode) 910 { 911 int error; 912 913 error = gfs2_repermission(dip->i_vnode, MAY_WRITE | MAY_EXEC, NULL); 914 if (error) 915 return error; 916 917 /* Don't create entries in an unlinked directory */ 918 if (!dip->i_di.di_nlink) 919 return -EPERM; 920 921 error = gfs2_dir_search(dip, name, NULL, NULL); 922 switch (error) { 923 case -ENOENT: 924 error = 0; 925 break; 926 case 0: 927 return -EEXIST; 928 default: 929 return error; 930 } 931 932 if (dip->i_di.di_entries == (uint32_t)-1) 933 return -EFBIG; 934 if (S_ISDIR(mode) && dip->i_di.di_nlink == (uint32_t)-1) 935 return -EMLINK; 936 937 return 0; 938 } 939 940 static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode, 941 unsigned int *uid, unsigned int *gid) 942 { 943 if (dip->i_sbd->sd_args.ar_suiddir && 944 (dip->i_di.di_mode & S_ISUID) && 945 dip->i_di.di_uid) { 946 if (S_ISDIR(*mode)) 947 *mode |= S_ISUID; 948 else if (dip->i_di.di_uid != current->fsuid) 949 *mode &= ~07111; 950 *uid = dip->i_di.di_uid; 951 } else 952 *uid = current->fsuid; 953 954 if (dip->i_di.di_mode & S_ISGID) { 955 if (S_ISDIR(*mode)) 956 *mode |= S_ISGID; 957 *gid = dip->i_di.di_gid; 958 } else 959 *gid = current->fsgid; 960 } 961 962 static int alloc_dinode(struct gfs2_inode *dip, struct gfs2_unlinked *ul) 963 { 964 struct gfs2_sbd *sdp = dip->i_sbd; 965 int error; 966 967 gfs2_alloc_get(dip); 968 969 dip->i_alloc.al_requested = RES_DINODE; 970 error = gfs2_inplace_reserve(dip); 971 if (error) 972 goto out; 973 974 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_UNLINKED + 975 RES_STATFS, 0); 976 if (error) 977 goto out_ipreserv; 978 979 ul->ul_ut.ut_inum.no_addr = gfs2_alloc_di(dip); 980 981 ul->ul_ut.ut_flags = GFS2_UTF_UNINIT; 982 error = gfs2_unlinked_ondisk_add(sdp, ul); 983 984 gfs2_trans_end(sdp); 985 986 out_ipreserv: 987 gfs2_inplace_release(dip); 988 989 out: 990 gfs2_alloc_put(dip); 991 992 return error; 993 } 994 995 /** 996 * init_dinode - Fill in a new dinode structure 997 * @dip: the directory this inode is being created in 998 * @gl: The glock covering the new inode 999 * @inum: the inode number 1000 * @mode: the file permissions 1001 * @uid: 1002 * @gid: 1003 * 1004 */ 1005 1006 static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, 1007 struct gfs2_inum *inum, unsigned int mode, 1008 unsigned int uid, unsigned int gid) 1009 { 1010 struct gfs2_sbd *sdp = dip->i_sbd; 1011 struct gfs2_dinode *di; 1012 struct buffer_head *dibh; 1013 1014 dibh = gfs2_meta_new(gl, inum->no_addr); 1015 gfs2_trans_add_bh(gl, dibh, 1); 1016 gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI); 1017 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); 1018 di = (struct gfs2_dinode *)dibh->b_data; 1019 1020 di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino); 1021 di->di_num.no_addr = cpu_to_be64(inum->no_addr); 1022 di->di_mode = cpu_to_be32(mode); 1023 di->di_uid = cpu_to_be32(uid); 1024 di->di_gid = cpu_to_be32(gid); 1025 di->di_nlink = cpu_to_be32(0); 1026 di->di_size = cpu_to_be64(0); 1027 di->di_blocks = cpu_to_be64(1); 1028 di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(get_seconds()); 1029 di->di_major = di->di_minor = cpu_to_be32(0); 1030 di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr); 1031 di->__pad[0] = di->__pad[1] = 0; 1032 di->di_flags = cpu_to_be32(0); 1033 1034 if (S_ISREG(mode)) { 1035 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA) || 1036 gfs2_tune_get(sdp, gt_new_files_jdata)) 1037 di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA); 1038 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO) || 1039 gfs2_tune_get(sdp, gt_new_files_directio)) 1040 di->di_flags |= cpu_to_be32(GFS2_DIF_DIRECTIO); 1041 } else if (S_ISDIR(mode)) { 1042 di->di_flags |= cpu_to_be32(dip->i_di.di_flags & 1043 GFS2_DIF_INHERIT_DIRECTIO); 1044 di->di_flags |= cpu_to_be32(dip->i_di.di_flags & 1045 GFS2_DIF_INHERIT_JDATA); 1046 } 1047 1048 di->__pad1 = 0; 1049 di->di_height = cpu_to_be32(0); 1050 di->__pad2 = 0; 1051 di->__pad3 = 0; 1052 di->di_depth = cpu_to_be16(0); 1053 di->di_entries = cpu_to_be32(0); 1054 memset(&di->__pad4, 0, sizeof(di->__pad4)); 1055 di->di_eattr = cpu_to_be64(0); 1056 memset(&di->di_reserved, 0, sizeof(di->di_reserved)); 1057 1058 brelse(dibh); 1059 } 1060 1061 static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, 1062 unsigned int mode, struct gfs2_unlinked *ul) 1063 { 1064 struct gfs2_sbd *sdp = dip->i_sbd; 1065 unsigned int uid, gid; 1066 int error; 1067 1068 munge_mode_uid_gid(dip, &mode, &uid, &gid); 1069 1070 gfs2_alloc_get(dip); 1071 1072 error = gfs2_quota_lock(dip, uid, gid); 1073 if (error) 1074 goto out; 1075 1076 error = gfs2_quota_check(dip, uid, gid); 1077 if (error) 1078 goto out_quota; 1079 1080 error = gfs2_trans_begin(sdp, RES_DINODE + RES_UNLINKED + 1081 RES_QUOTA, 0); 1082 if (error) 1083 goto out_quota; 1084 1085 ul->ul_ut.ut_flags = 0; 1086 error = gfs2_unlinked_ondisk_munge(sdp, ul); 1087 1088 init_dinode(dip, gl, &ul->ul_ut.ut_inum, 1089 mode, uid, gid); 1090 1091 gfs2_quota_change(dip, +1, uid, gid); 1092 1093 gfs2_trans_end(sdp); 1094 1095 out_quota: 1096 gfs2_quota_unlock(dip); 1097 1098 out: 1099 gfs2_alloc_put(dip); 1100 1101 return error; 1102 } 1103 1104 static int link_dinode(struct gfs2_inode *dip, struct qstr *name, 1105 struct gfs2_inode *ip, struct gfs2_unlinked *ul) 1106 { 1107 struct gfs2_sbd *sdp = dip->i_sbd; 1108 struct gfs2_alloc *al; 1109 int alloc_required; 1110 struct buffer_head *dibh; 1111 int error; 1112 1113 al = gfs2_alloc_get(dip); 1114 1115 error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); 1116 if (error) 1117 goto fail; 1118 1119 error = gfs2_diradd_alloc_required(dip, name, &alloc_required); 1120 if (alloc_required) { 1121 error = gfs2_quota_check(dip, dip->i_di.di_uid, 1122 dip->i_di.di_gid); 1123 if (error) 1124 goto fail_quota_locks; 1125 1126 al->al_requested = sdp->sd_max_dirres; 1127 1128 error = gfs2_inplace_reserve(dip); 1129 if (error) 1130 goto fail_quota_locks; 1131 1132 error = gfs2_trans_begin(sdp, 1133 sdp->sd_max_dirres + 1134 al->al_rgd->rd_ri.ri_length + 1135 2 * RES_DINODE + RES_UNLINKED + 1136 RES_STATFS + RES_QUOTA, 0); 1137 if (error) 1138 goto fail_ipreserv; 1139 } else { 1140 error = gfs2_trans_begin(sdp, 1141 RES_LEAF + 1142 2 * RES_DINODE + 1143 RES_UNLINKED, 0); 1144 if (error) 1145 goto fail_quota_locks; 1146 } 1147 1148 error = gfs2_dir_add(dip, name, &ip->i_num, IF2DT(ip->i_di.di_mode)); 1149 if (error) 1150 goto fail_end_trans; 1151 1152 error = gfs2_meta_inode_buffer(ip, &dibh); 1153 if (error) 1154 goto fail_end_trans; 1155 ip->i_di.di_nlink = 1; 1156 gfs2_trans_add_bh(ip->i_gl, dibh, 1); 1157 gfs2_dinode_out(&ip->i_di, dibh->b_data); 1158 brelse(dibh); 1159 1160 error = gfs2_unlinked_ondisk_rm(sdp, ul); 1161 if (error) 1162 goto fail_end_trans; 1163 1164 return 0; 1165 1166 fail_end_trans: 1167 gfs2_trans_end(sdp); 1168 1169 fail_ipreserv: 1170 if (dip->i_alloc.al_rgd) 1171 gfs2_inplace_release(dip); 1172 1173 fail_quota_locks: 1174 gfs2_quota_unlock(dip); 1175 1176 fail: 1177 gfs2_alloc_put(dip); 1178 1179 return error; 1180 } 1181 1182 /** 1183 * gfs2_createi - Create a new inode 1184 * @ghs: An array of two holders 1185 * @name: The name of the new file 1186 * @mode: the permissions on the new inode 1187 * 1188 * @ghs[0] is an initialized holder for the directory 1189 * @ghs[1] is the holder for the inode lock 1190 * 1191 * If the return value is not NULL, the glocks on both the directory and the new 1192 * file are held. A transaction has been started and an inplace reservation 1193 * is held, as well. 1194 * 1195 * Returns: An inode 1196 */ 1197 1198 struct inode *gfs2_createi(struct gfs2_holder *ghs, struct qstr *name, 1199 unsigned int mode) 1200 { 1201 struct inode *inode; 1202 struct gfs2_inode *dip = ghs->gh_gl->gl_object; 1203 struct gfs2_sbd *sdp = dip->i_sbd; 1204 struct gfs2_unlinked *ul; 1205 struct gfs2_inode *ip; 1206 int error; 1207 1208 if (!name->len || name->len > GFS2_FNAMESIZE) 1209 return ERR_PTR(-ENAMETOOLONG); 1210 1211 error = gfs2_unlinked_get(sdp, &ul); 1212 if (error) 1213 return ERR_PTR(error); 1214 1215 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs); 1216 error = gfs2_glock_nq(ghs); 1217 if (error) 1218 goto fail; 1219 1220 error = create_ok(dip, name, mode); 1221 if (error) 1222 goto fail_gunlock; 1223 1224 error = pick_formal_ino(sdp, &ul->ul_ut.ut_inum.no_formal_ino); 1225 if (error) 1226 goto fail_gunlock; 1227 1228 error = alloc_dinode(dip, ul); 1229 if (error) 1230 goto fail_gunlock; 1231 1232 if (ul->ul_ut.ut_inum.no_addr < dip->i_num.no_addr) { 1233 gfs2_glock_dq(ghs); 1234 1235 error = gfs2_glock_nq_num(sdp, 1236 ul->ul_ut.ut_inum.no_addr, 1237 &gfs2_inode_glops, 1238 LM_ST_EXCLUSIVE, GL_SKIP, 1239 ghs + 1); 1240 if (error) { 1241 gfs2_unlinked_put(sdp, ul); 1242 return ERR_PTR(error); 1243 } 1244 1245 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs); 1246 error = gfs2_glock_nq(ghs); 1247 if (error) { 1248 gfs2_glock_dq_uninit(ghs + 1); 1249 gfs2_unlinked_put(sdp, ul); 1250 return ERR_PTR(error); 1251 } 1252 1253 error = create_ok(dip, name, mode); 1254 if (error) 1255 goto fail_gunlock2; 1256 } else { 1257 error = gfs2_glock_nq_num(sdp, 1258 ul->ul_ut.ut_inum.no_addr, 1259 &gfs2_inode_glops, 1260 LM_ST_EXCLUSIVE, GL_SKIP, 1261 ghs + 1); 1262 if (error) 1263 goto fail_gunlock; 1264 } 1265 1266 error = make_dinode(dip, ghs[1].gh_gl, mode, ul); 1267 if (error) 1268 goto fail_gunlock2; 1269 1270 error = gfs2_inode_get(ghs[1].gh_gl, &ul->ul_ut.ut_inum, CREATE, &ip); 1271 if (error) 1272 goto fail_gunlock2; 1273 1274 error = gfs2_inode_refresh(ip); 1275 if (error) 1276 goto fail_iput; 1277 1278 error = gfs2_acl_create(dip, ip); 1279 if (error) 1280 goto fail_iput; 1281 1282 error = link_dinode(dip, name, ip, ul); 1283 if (error) 1284 goto fail_iput; 1285 1286 gfs2_unlinked_put(sdp, ul); 1287 1288 inode = gfs2_ip2v(ip); 1289 gfs2_inode_put(ip); 1290 if (!inode) 1291 return ERR_PTR(-ENOMEM); 1292 return inode; 1293 1294 fail_iput: 1295 gfs2_inode_put(ip); 1296 1297 fail_gunlock2: 1298 gfs2_glock_dq_uninit(ghs + 1); 1299 1300 fail_gunlock: 1301 gfs2_glock_dq(ghs); 1302 1303 fail: 1304 gfs2_unlinked_put(sdp, ul); 1305 1306 return ERR_PTR(error); 1307 } 1308 1309 /** 1310 * gfs2_unlinki - Unlink a file 1311 * @dip: The inode of the directory 1312 * @name: The name of the file to be unlinked 1313 * @ip: The inode of the file to be removed 1314 * 1315 * Assumes Glocks on both dip and ip are held. 1316 * 1317 * Returns: errno 1318 */ 1319 1320 int gfs2_unlinki(struct gfs2_inode *dip, struct qstr *name, 1321 struct gfs2_inode *ip, struct gfs2_unlinked *ul) 1322 { 1323 struct gfs2_sbd *sdp = dip->i_sbd; 1324 int error; 1325 1326 error = gfs2_dir_del(dip, name); 1327 if (error) 1328 return error; 1329 1330 error = gfs2_change_nlink(ip, -1); 1331 if (error) 1332 return error; 1333 1334 /* If this inode is being unlinked from the directory structure, 1335 we need to mark that in the log so that it isn't lost during 1336 a crash. */ 1337 1338 if (!ip->i_di.di_nlink) { 1339 ul->ul_ut.ut_inum = ip->i_num; 1340 error = gfs2_unlinked_ondisk_add(sdp, ul); 1341 if (!error) 1342 set_bit(GLF_STICKY, &ip->i_gl->gl_flags); 1343 } 1344 1345 return error; 1346 } 1347 1348 /** 1349 * gfs2_rmdiri - Remove a directory 1350 * @dip: The parent directory of the directory to be removed 1351 * @name: The name of the directory to be removed 1352 * @ip: The GFS2 inode of the directory to be removed 1353 * 1354 * Assumes Glocks on dip and ip are held 1355 * 1356 * Returns: errno 1357 */ 1358 1359 int gfs2_rmdiri(struct gfs2_inode *dip, struct qstr *name, 1360 struct gfs2_inode *ip, struct gfs2_unlinked *ul) 1361 { 1362 struct gfs2_sbd *sdp = dip->i_sbd; 1363 struct qstr dotname; 1364 int error; 1365 1366 if (ip->i_di.di_entries != 2) { 1367 if (gfs2_consist_inode(ip)) 1368 gfs2_dinode_print(&ip->i_di); 1369 return -EIO; 1370 } 1371 1372 error = gfs2_dir_del(dip, name); 1373 if (error) 1374 return error; 1375 1376 error = gfs2_change_nlink(dip, -1); 1377 if (error) 1378 return error; 1379 1380 dotname.len = 1; 1381 dotname.name = "."; 1382 error = gfs2_dir_del(ip, &dotname); 1383 if (error) 1384 return error; 1385 1386 dotname.len = 2; 1387 dotname.name = ".."; 1388 error = gfs2_dir_del(ip, &dotname); 1389 if (error) 1390 return error; 1391 1392 error = gfs2_change_nlink(ip, -2); 1393 if (error) 1394 return error; 1395 1396 /* This inode is being unlinked from the directory structure and 1397 we need to mark that in the log so that it isn't lost during 1398 a crash. */ 1399 1400 ul->ul_ut.ut_inum = ip->i_num; 1401 error = gfs2_unlinked_ondisk_add(sdp, ul); 1402 if (!error) 1403 set_bit(GLF_STICKY, &ip->i_gl->gl_flags); 1404 1405 return error; 1406 } 1407 1408 /* 1409 * gfs2_unlink_ok - check to see that a inode is still in a directory 1410 * @dip: the directory 1411 * @name: the name of the file 1412 * @ip: the inode 1413 * 1414 * Assumes that the lock on (at least) @dip is held. 1415 * 1416 * Returns: 0 if the parent/child relationship is correct, errno if it isn't 1417 */ 1418 1419 int gfs2_unlink_ok(struct gfs2_inode *dip, struct qstr *name, 1420 struct gfs2_inode *ip) 1421 { 1422 struct gfs2_inum inum; 1423 unsigned int type; 1424 int error; 1425 1426 if (IS_IMMUTABLE(ip->i_vnode) || IS_APPEND(ip->i_vnode)) 1427 return -EPERM; 1428 1429 if ((dip->i_di.di_mode & S_ISVTX) && 1430 dip->i_di.di_uid != current->fsuid && 1431 ip->i_di.di_uid != current->fsuid && 1432 !capable(CAP_FOWNER)) 1433 return -EPERM; 1434 1435 if (IS_APPEND(dip->i_vnode)) 1436 return -EPERM; 1437 1438 error = gfs2_repermission(dip->i_vnode, MAY_WRITE | MAY_EXEC, NULL); 1439 if (error) 1440 return error; 1441 1442 error = gfs2_dir_search(dip, name, &inum, &type); 1443 if (error) 1444 return error; 1445 1446 if (!gfs2_inum_equal(&inum, &ip->i_num)) 1447 return -ENOENT; 1448 1449 if (IF2DT(ip->i_di.di_mode) != type) { 1450 gfs2_consist_inode(dip); 1451 return -EIO; 1452 } 1453 1454 return 0; 1455 } 1456 1457 /* 1458 * gfs2_ok_to_move - check if it's ok to move a directory to another directory 1459 * @this: move this 1460 * @to: to here 1461 * 1462 * Follow @to back to the root and make sure we don't encounter @this 1463 * Assumes we already hold the rename lock. 1464 * 1465 * Returns: errno 1466 */ 1467 1468 int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) 1469 { 1470 struct inode *dir = to->i_vnode; 1471 struct super_block *sb = dir->i_sb; 1472 struct inode *tmp; 1473 struct qstr dotdot; 1474 int error = 0; 1475 1476 memset(&dotdot, 0, sizeof(struct qstr)); 1477 dotdot.name = ".."; 1478 dotdot.len = 2; 1479 1480 igrab(dir); 1481 1482 for (;;) { 1483 if (dir == this->i_vnode) { 1484 error = -EINVAL; 1485 break; 1486 } 1487 if (dir == sb->s_root->d_inode) { 1488 error = 0; 1489 break; 1490 } 1491 1492 error = gfs2_lookupi(dir, &dotdot, 1, &tmp); 1493 if (error) 1494 break; 1495 1496 iput(dir); 1497 dir = tmp; 1498 } 1499 1500 iput(dir); 1501 1502 return error; 1503 } 1504 1505 /** 1506 * gfs2_readlinki - return the contents of a symlink 1507 * @ip: the symlink's inode 1508 * @buf: a pointer to the buffer to be filled 1509 * @len: a pointer to the length of @buf 1510 * 1511 * If @buf is too small, a piece of memory is kmalloc()ed and needs 1512 * to be freed by the caller. 1513 * 1514 * Returns: errno 1515 */ 1516 1517 int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len) 1518 { 1519 struct gfs2_holder i_gh; 1520 struct buffer_head *dibh; 1521 unsigned int x; 1522 int error; 1523 1524 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh); 1525 error = gfs2_glock_nq_atime(&i_gh); 1526 if (error) { 1527 gfs2_holder_uninit(&i_gh); 1528 return error; 1529 } 1530 1531 if (!ip->i_di.di_size) { 1532 gfs2_consist_inode(ip); 1533 error = -EIO; 1534 goto out; 1535 } 1536 1537 error = gfs2_meta_inode_buffer(ip, &dibh); 1538 if (error) 1539 goto out; 1540 1541 x = ip->i_di.di_size + 1; 1542 if (x > *len) { 1543 *buf = kmalloc(x, GFP_KERNEL); 1544 if (!*buf) { 1545 error = -ENOMEM; 1546 goto out_brelse; 1547 } 1548 } 1549 1550 memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x); 1551 *len = x; 1552 1553 out_brelse: 1554 brelse(dibh); 1555 1556 out: 1557 gfs2_glock_dq_uninit(&i_gh); 1558 1559 return error; 1560 } 1561 1562 /** 1563 * gfs2_glock_nq_atime - Acquire a hold on an inode's glock, and 1564 * conditionally update the inode's atime 1565 * @gh: the holder to acquire 1566 * 1567 * Tests atime (access time) for gfs2_read, gfs2_readdir and gfs2_mmap 1568 * Update if the difference between the current time and the inode's current 1569 * atime is greater than an interval specified at mount. 1570 * 1571 * Returns: errno 1572 */ 1573 1574 int gfs2_glock_nq_atime(struct gfs2_holder *gh) 1575 { 1576 struct gfs2_glock *gl = gh->gh_gl; 1577 struct gfs2_sbd *sdp = gl->gl_sbd; 1578 struct gfs2_inode *ip = gl->gl_object; 1579 int64_t curtime, quantum = gfs2_tune_get(sdp, gt_atime_quantum); 1580 unsigned int state; 1581 int flags; 1582 int error; 1583 1584 if (gfs2_assert_warn(sdp, gh->gh_flags & GL_ATIME) || 1585 gfs2_assert_warn(sdp, !(gh->gh_flags & GL_ASYNC)) || 1586 gfs2_assert_warn(sdp, gl->gl_ops == &gfs2_inode_glops)) 1587 return -EINVAL; 1588 1589 state = gh->gh_state; 1590 flags = gh->gh_flags; 1591 1592 error = gfs2_glock_nq(gh); 1593 if (error) 1594 return error; 1595 1596 if (test_bit(SDF_NOATIME, &sdp->sd_flags) || 1597 (sdp->sd_vfs->s_flags & MS_RDONLY)) 1598 return 0; 1599 1600 curtime = get_seconds(); 1601 if (curtime - ip->i_di.di_atime >= quantum) { 1602 gfs2_glock_dq(gh); 1603 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 1604 gh->gh_flags & ~LM_FLAG_ANY, 1605 gh); 1606 error = gfs2_glock_nq(gh); 1607 if (error) 1608 return error; 1609 1610 /* Verify that atime hasn't been updated while we were 1611 trying to get exclusive lock. */ 1612 1613 curtime = get_seconds(); 1614 if (curtime - ip->i_di.di_atime >= quantum) { 1615 struct buffer_head *dibh; 1616 1617 error = gfs2_trans_begin(sdp, RES_DINODE, 0); 1618 if (error == -EROFS) 1619 return 0; 1620 if (error) 1621 goto fail; 1622 1623 error = gfs2_meta_inode_buffer(ip, &dibh); 1624 if (error) 1625 goto fail_end_trans; 1626 1627 ip->i_di.di_atime = curtime; 1628 1629 gfs2_trans_add_bh(ip->i_gl, dibh, 1); 1630 gfs2_dinode_out(&ip->i_di, dibh->b_data); 1631 brelse(dibh); 1632 1633 gfs2_trans_end(sdp); 1634 } 1635 1636 /* If someone else has asked for the glock, 1637 unlock and let them have it. Then reacquire 1638 in the original state. */ 1639 if (gfs2_glock_is_blocking(gl)) { 1640 gfs2_glock_dq(gh); 1641 gfs2_holder_reinit(state, flags, gh); 1642 return gfs2_glock_nq(gh); 1643 } 1644 } 1645 1646 return 0; 1647 1648 fail_end_trans: 1649 gfs2_trans_end(sdp); 1650 1651 fail: 1652 gfs2_glock_dq(gh); 1653 1654 return error; 1655 } 1656 1657 /** 1658 * glock_compare_atime - Compare two struct gfs2_glock structures for sort 1659 * @arg_a: the first structure 1660 * @arg_b: the second structure 1661 * 1662 * Returns: 1 if A > B 1663 * -1 if A < B 1664 * 0 if A = B 1665 */ 1666 1667 static int glock_compare_atime(const void *arg_a, const void *arg_b) 1668 { 1669 struct gfs2_holder *gh_a = *(struct gfs2_holder **)arg_a; 1670 struct gfs2_holder *gh_b = *(struct gfs2_holder **)arg_b; 1671 struct lm_lockname *a = &gh_a->gh_gl->gl_name; 1672 struct lm_lockname *b = &gh_b->gh_gl->gl_name; 1673 int ret = 0; 1674 1675 if (a->ln_number > b->ln_number) 1676 ret = 1; 1677 else if (a->ln_number < b->ln_number) 1678 ret = -1; 1679 else { 1680 if (gh_a->gh_state == LM_ST_SHARED && 1681 gh_b->gh_state == LM_ST_EXCLUSIVE) 1682 ret = 1; 1683 else if (gh_a->gh_state == LM_ST_SHARED && 1684 (gh_b->gh_flags & GL_ATIME)) 1685 ret = 1; 1686 } 1687 1688 return ret; 1689 } 1690 1691 /** 1692 * gfs2_glock_nq_m_atime - acquire multiple glocks where one may need an 1693 * atime update 1694 * @num_gh: the number of structures 1695 * @ghs: an array of struct gfs2_holder structures 1696 * 1697 * Returns: 0 on success (all glocks acquired), 1698 * errno on failure (no glocks acquired) 1699 */ 1700 1701 int gfs2_glock_nq_m_atime(unsigned int num_gh, struct gfs2_holder *ghs) 1702 { 1703 struct gfs2_holder **p; 1704 unsigned int x; 1705 int error = 0; 1706 1707 if (!num_gh) 1708 return 0; 1709 1710 if (num_gh == 1) { 1711 ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); 1712 if (ghs->gh_flags & GL_ATIME) 1713 error = gfs2_glock_nq_atime(ghs); 1714 else 1715 error = gfs2_glock_nq(ghs); 1716 return error; 1717 } 1718 1719 p = kcalloc(num_gh, sizeof(struct gfs2_holder *), GFP_KERNEL); 1720 if (!p) 1721 return -ENOMEM; 1722 1723 for (x = 0; x < num_gh; x++) 1724 p[x] = &ghs[x]; 1725 1726 sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare_atime,NULL); 1727 1728 for (x = 0; x < num_gh; x++) { 1729 p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); 1730 1731 if (p[x]->gh_flags & GL_ATIME) 1732 error = gfs2_glock_nq_atime(p[x]); 1733 else 1734 error = gfs2_glock_nq(p[x]); 1735 1736 if (error) { 1737 while (x--) 1738 gfs2_glock_dq(p[x]); 1739 break; 1740 } 1741 } 1742 1743 kfree(p); 1744 1745 return error; 1746 } 1747 1748 /** 1749 * gfs2_try_toss_vnode - See if we can toss a vnode from memory 1750 * @ip: the inode 1751 * 1752 * Returns: 1 if the vnode was tossed 1753 */ 1754 1755 void gfs2_try_toss_vnode(struct gfs2_inode *ip) 1756 { 1757 struct inode *inode; 1758 1759 inode = gfs2_ip2v_lookup(ip); 1760 if (!inode) 1761 return; 1762 1763 d_prune_aliases(inode); 1764 1765 if (S_ISDIR(ip->i_di.di_mode)) { 1766 struct list_head *head = &inode->i_dentry; 1767 struct dentry *d = NULL; 1768 1769 spin_lock(&dcache_lock); 1770 if (list_empty(head)) 1771 spin_unlock(&dcache_lock); 1772 else { 1773 d = list_entry(head->next, struct dentry, d_alias); 1774 dget_locked(d); 1775 spin_unlock(&dcache_lock); 1776 1777 if (have_submounts(d)) 1778 dput(d); 1779 else { 1780 shrink_dcache_parent(d); 1781 dput(d); 1782 d_prune_aliases(inode); 1783 } 1784 } 1785 } 1786 1787 inode->i_nlink = 0; 1788 iput(inode); 1789 } 1790 1791 1792 static int 1793 __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr) 1794 { 1795 struct buffer_head *dibh; 1796 int error; 1797 1798 error = gfs2_meta_inode_buffer(ip, &dibh); 1799 if (!error) { 1800 error = inode_setattr(ip->i_vnode, attr); 1801 gfs2_assert_warn(ip->i_sbd, !error); 1802 gfs2_inode_attr_out(ip); 1803 1804 gfs2_trans_add_bh(ip->i_gl, dibh, 1); 1805 gfs2_dinode_out(&ip->i_di, dibh->b_data); 1806 brelse(dibh); 1807 } 1808 return error; 1809 } 1810 1811 /** 1812 * gfs2_setattr_simple - 1813 * @ip: 1814 * @attr: 1815 * 1816 * Called with a reference on the vnode. 1817 * 1818 * Returns: errno 1819 */ 1820 1821 int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr) 1822 { 1823 int error; 1824 1825 if (current->journal_info) 1826 return __gfs2_setattr_simple(ip, attr); 1827 1828 error = gfs2_trans_begin(ip->i_sbd, RES_DINODE, 0); 1829 if (error) 1830 return error; 1831 1832 error = __gfs2_setattr_simple(ip, attr); 1833 1834 gfs2_trans_end(ip->i_sbd); 1835 1836 return error; 1837 } 1838 1839 int gfs2_repermission(struct inode *inode, int mask, struct nameidata *nd) 1840 { 1841 return permission(inode, mask, nd); 1842 } 1843 1844