1 /* 2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 3 * Copyright (C) 2004-2006 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 <linux/crc32.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 "util.h" 39 40 /** 41 * gfs2_inode_attr_in - Copy attributes from the dinode into the VFS inode 42 * @ip: The GFS2 inode (with embedded disk inode data) 43 * @inode: The Linux VFS inode 44 * 45 */ 46 47 void gfs2_inode_attr_in(struct gfs2_inode *ip) 48 { 49 struct inode *inode = &ip->i_inode; 50 51 inode->i_ino = ip->i_num.no_addr; 52 53 switch (ip->i_di.di_mode & S_IFMT) { 54 case S_IFBLK: 55 case S_IFCHR: 56 inode->i_rdev = MKDEV(ip->i_di.di_major, ip->i_di.di_minor); 57 break; 58 default: 59 inode->i_rdev = 0; 60 break; 61 }; 62 63 inode->i_mode = ip->i_di.di_mode; 64 inode->i_nlink = ip->i_di.di_nlink; 65 inode->i_uid = ip->i_di.di_uid; 66 inode->i_gid = ip->i_di.di_gid; 67 i_size_write(inode, ip->i_di.di_size); 68 inode->i_atime.tv_sec = ip->i_di.di_atime; 69 inode->i_mtime.tv_sec = ip->i_di.di_mtime; 70 inode->i_ctime.tv_sec = ip->i_di.di_ctime; 71 inode->i_atime.tv_nsec = 0; 72 inode->i_mtime.tv_nsec = 0; 73 inode->i_ctime.tv_nsec = 0; 74 inode->i_blksize = PAGE_SIZE; 75 inode->i_blocks = ip->i_di.di_blocks << 76 (GFS2_SB(inode)->sd_sb.sb_bsize_shift - GFS2_BASIC_BLOCK_SHIFT); 77 78 if (ip->i_di.di_flags & GFS2_DIF_IMMUTABLE) 79 inode->i_flags |= S_IMMUTABLE; 80 else 81 inode->i_flags &= ~S_IMMUTABLE; 82 83 if (ip->i_di.di_flags & GFS2_DIF_APPENDONLY) 84 inode->i_flags |= S_APPEND; 85 else 86 inode->i_flags &= ~S_APPEND; 87 } 88 89 /** 90 * gfs2_inode_attr_out - Copy attributes from VFS inode into the dinode 91 * @ip: The GFS2 inode 92 * 93 * Only copy out the attributes that we want the VFS layer 94 * to be able to modify. 95 */ 96 97 void gfs2_inode_attr_out(struct gfs2_inode *ip) 98 { 99 struct inode *inode = &ip->i_inode; 100 101 gfs2_assert_withdraw(GFS2_SB(inode), 102 (ip->i_di.di_mode & S_IFMT) == (inode->i_mode & S_IFMT)); 103 ip->i_di.di_mode = inode->i_mode; 104 ip->i_di.di_uid = inode->i_uid; 105 ip->i_di.di_gid = inode->i_gid; 106 ip->i_di.di_atime = inode->i_atime.tv_sec; 107 ip->i_di.di_mtime = inode->i_mtime.tv_sec; 108 ip->i_di.di_ctime = inode->i_ctime.tv_sec; 109 } 110 111 static int iget_test(struct inode *inode, void *opaque) 112 { 113 struct gfs2_inode *ip = GFS2_I(inode); 114 struct gfs2_inum *inum = opaque; 115 116 if (ip && ip->i_num.no_addr == inum->no_addr) 117 return 1; 118 119 return 0; 120 } 121 122 static int iget_set(struct inode *inode, void *opaque) 123 { 124 struct gfs2_inode *ip = GFS2_I(inode); 125 struct gfs2_inum *inum = opaque; 126 127 ip->i_num = *inum; 128 return 0; 129 } 130 131 struct inode *gfs2_ilookup(struct super_block *sb, struct gfs2_inum *inum) 132 { 133 return ilookup5(sb, (unsigned long)inum->no_formal_ino, 134 iget_test, inum); 135 } 136 137 static struct inode *gfs2_iget(struct super_block *sb, struct gfs2_inum *inum) 138 { 139 return iget5_locked(sb, (unsigned long)inum->no_formal_ino, 140 iget_test, iget_set, inum); 141 } 142 143 /** 144 * gfs2_inode_lookup - Lookup an inode 145 * @sb: The super block 146 * @inum: The inode number 147 * @type: The type of the inode 148 * 149 * Returns: A VFS inode, or an error 150 */ 151 152 struct inode *gfs2_inode_lookup(struct super_block *sb, struct gfs2_inum *inum, unsigned int type) 153 { 154 struct inode *inode = gfs2_iget(sb, inum); 155 struct gfs2_inode *ip = GFS2_I(inode); 156 struct gfs2_glock *io_gl; 157 int error; 158 159 if (inode->i_state & I_NEW) { 160 struct gfs2_sbd *sdp = GFS2_SB(inode); 161 umode_t mode = DT2IF(type); 162 inode->u.generic_ip = ip; 163 inode->i_mode = mode; 164 165 if (S_ISREG(mode)) { 166 inode->i_op = &gfs2_file_iops; 167 inode->i_fop = &gfs2_file_fops; 168 inode->i_mapping->a_ops = &gfs2_file_aops; 169 } else if (S_ISDIR(mode)) { 170 inode->i_op = &gfs2_dir_iops; 171 inode->i_fop = &gfs2_dir_fops; 172 } else if (S_ISLNK(mode)) { 173 inode->i_op = &gfs2_symlink_iops; 174 } else { 175 inode->i_op = &gfs2_dev_iops; 176 } 177 178 error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); 179 if (unlikely(error)) 180 goto fail; 181 ip->i_gl->gl_object = ip; 182 183 error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_iopen_glops, CREATE, &io_gl); 184 if (unlikely(error)) 185 goto fail_put; 186 187 ip->i_vn = ip->i_gl->gl_vn - 1; 188 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); 189 if (unlikely(error)) 190 goto fail_iopen; 191 192 gfs2_glock_put(io_gl); 193 unlock_new_inode(inode); 194 } 195 196 return inode; 197 fail_iopen: 198 gfs2_glock_put(io_gl); 199 fail_put: 200 ip->i_gl->gl_object = NULL; 201 gfs2_glock_put(ip->i_gl); 202 fail: 203 iput(inode); 204 return ERR_PTR(error); 205 } 206 207 /** 208 * gfs2_inode_refresh - Refresh the incore copy of the dinode 209 * @ip: The GFS2 inode 210 * 211 * Returns: errno 212 */ 213 214 int gfs2_inode_refresh(struct gfs2_inode *ip) 215 { 216 struct buffer_head *dibh; 217 int error; 218 219 error = gfs2_meta_inode_buffer(ip, &dibh); 220 if (error) 221 return error; 222 223 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), dibh, GFS2_METATYPE_DI)) { 224 brelse(dibh); 225 return -EIO; 226 } 227 228 gfs2_dinode_in(&ip->i_di, dibh->b_data); 229 230 brelse(dibh); 231 232 if (ip->i_num.no_addr != ip->i_di.di_num.no_addr) { 233 if (gfs2_consist_inode(ip)) 234 gfs2_dinode_print(&ip->i_di); 235 return -EIO; 236 } 237 if (ip->i_num.no_formal_ino != ip->i_di.di_num.no_formal_ino) 238 return -ESTALE; 239 240 ip->i_vn = ip->i_gl->gl_vn; 241 242 return 0; 243 } 244 245 int gfs2_dinode_dealloc(struct gfs2_inode *ip) 246 { 247 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 248 struct gfs2_alloc *al; 249 struct gfs2_rgrpd *rgd; 250 int error; 251 252 if (ip->i_di.di_blocks != 1) { 253 if (gfs2_consist_inode(ip)) 254 gfs2_dinode_print(&ip->i_di); 255 return -EIO; 256 } 257 258 al = gfs2_alloc_get(ip); 259 260 error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); 261 if (error) 262 goto out; 263 264 error = gfs2_rindex_hold(sdp, &al->al_ri_gh); 265 if (error) 266 goto out_qs; 267 268 rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr); 269 if (!rgd) { 270 gfs2_consist_inode(ip); 271 error = -EIO; 272 goto out_rindex_relse; 273 } 274 275 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, 276 &al->al_rgd_gh); 277 if (error) 278 goto out_rindex_relse; 279 280 error = gfs2_trans_begin(sdp, RES_RG_BIT + 281 RES_STATFS + RES_QUOTA, 1); 282 if (error) 283 goto out_rg_gunlock; 284 285 gfs2_trans_add_gl(ip->i_gl); 286 287 gfs2_free_di(rgd, ip); 288 289 gfs2_trans_end(sdp); 290 clear_bit(GLF_STICKY, &ip->i_gl->gl_flags); 291 292 out_rg_gunlock: 293 gfs2_glock_dq_uninit(&al->al_rgd_gh); 294 out_rindex_relse: 295 gfs2_glock_dq_uninit(&al->al_ri_gh); 296 out_qs: 297 gfs2_quota_unhold(ip); 298 out: 299 gfs2_alloc_put(ip); 300 return error; 301 } 302 303 /** 304 * gfs2_change_nlink - Change nlink count on inode 305 * @ip: The GFS2 inode 306 * @diff: The change in the nlink count required 307 * 308 * Returns: errno 309 */ 310 311 int gfs2_change_nlink(struct gfs2_inode *ip, int diff) 312 { 313 struct gfs2_sbd *sdp = ip->i_inode.i_sb->s_fs_info; 314 struct buffer_head *dibh; 315 uint32_t nlink; 316 int error; 317 318 BUG_ON(ip->i_di.di_nlink != ip->i_inode.i_nlink); 319 nlink = ip->i_di.di_nlink + diff; 320 321 /* If we are reducing the nlink count, but the new value ends up being 322 bigger than the old one, we must have underflowed. */ 323 if (diff < 0 && nlink > ip->i_di.di_nlink) { 324 if (gfs2_consist_inode(ip)) 325 gfs2_dinode_print(&ip->i_di); 326 return -EIO; 327 } 328 329 error = gfs2_meta_inode_buffer(ip, &dibh); 330 if (error) 331 return error; 332 333 ip->i_di.di_nlink = nlink; 334 ip->i_di.di_ctime = get_seconds(); 335 ip->i_inode.i_nlink = nlink; 336 337 gfs2_trans_add_bh(ip->i_gl, dibh, 1); 338 gfs2_dinode_out(&ip->i_di, dibh->b_data); 339 brelse(dibh); 340 mark_inode_dirty(&ip->i_inode); 341 342 if (ip->i_di.di_nlink == 0) { 343 struct gfs2_rgrpd *rgd; 344 struct gfs2_holder ri_gh, rg_gh; 345 346 error = gfs2_rindex_hold(sdp, &ri_gh); 347 if (error) 348 goto out; 349 error = -EIO; 350 rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr); 351 if (!rgd) 352 goto out_norgrp; 353 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh); 354 if (error) 355 goto out_norgrp; 356 357 gfs2_unlink_di(&ip->i_inode); /* mark inode unlinked */ 358 gfs2_glock_dq_uninit(&rg_gh); 359 out_norgrp: 360 gfs2_glock_dq_uninit(&ri_gh); 361 } 362 out: 363 return error; 364 } 365 366 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name) 367 { 368 struct qstr qstr; 369 gfs2_str2qstr(&qstr, name); 370 return gfs2_lookupi(dip, &qstr, 1, NULL); 371 } 372 373 374 /** 375 * gfs2_lookupi - Look up a filename in a directory and return its inode 376 * @d_gh: An initialized holder for the directory glock 377 * @name: The name of the inode to look for 378 * @is_root: If 1, ignore the caller's permissions 379 * @i_gh: An uninitialized holder for the new inode glock 380 * 381 * There will always be a vnode (Linux VFS inode) for the d_gh inode unless 382 * @is_root is true. 383 * 384 * Returns: errno 385 */ 386 387 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name, 388 int is_root, struct nameidata *nd) 389 390 { 391 struct super_block *sb = dir->i_sb; 392 struct gfs2_inode *dip = GFS2_I(dir); 393 struct gfs2_holder d_gh; 394 struct gfs2_inum inum; 395 unsigned int type; 396 int error = 0; 397 struct inode *inode = NULL; 398 399 if (!name->len || name->len > GFS2_FNAMESIZE) 400 return ERR_PTR(-ENAMETOOLONG); 401 402 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) || 403 (name->len == 2 && memcmp(name->name, "..", 2) == 0 && 404 dir == sb->s_root->d_inode)) { 405 igrab(dir); 406 return dir; 407 } 408 409 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); 410 if (error) 411 return ERR_PTR(error); 412 413 if (!is_root) { 414 error = permission(dir, MAY_EXEC, NULL); 415 if (error) 416 goto out; 417 } 418 419 error = gfs2_dir_search(dir, name, &inum, &type); 420 if (error) 421 goto out; 422 423 inode = gfs2_inode_lookup(sb, &inum, type); 424 425 out: 426 gfs2_glock_dq_uninit(&d_gh); 427 if (error == -ENOENT) 428 return NULL; 429 return inode; 430 } 431 432 static int pick_formal_ino_1(struct gfs2_sbd *sdp, uint64_t *formal_ino) 433 { 434 struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode); 435 struct buffer_head *bh; 436 struct gfs2_inum_range ir; 437 int error; 438 439 error = gfs2_trans_begin(sdp, RES_DINODE, 0); 440 if (error) 441 return error; 442 mutex_lock(&sdp->sd_inum_mutex); 443 444 error = gfs2_meta_inode_buffer(ip, &bh); 445 if (error) { 446 mutex_unlock(&sdp->sd_inum_mutex); 447 gfs2_trans_end(sdp); 448 return error; 449 } 450 451 gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode)); 452 453 if (ir.ir_length) { 454 *formal_ino = ir.ir_start++; 455 ir.ir_length--; 456 gfs2_trans_add_bh(ip->i_gl, bh, 1); 457 gfs2_inum_range_out(&ir, 458 bh->b_data + sizeof(struct gfs2_dinode)); 459 brelse(bh); 460 mutex_unlock(&sdp->sd_inum_mutex); 461 gfs2_trans_end(sdp); 462 return 0; 463 } 464 465 brelse(bh); 466 467 mutex_unlock(&sdp->sd_inum_mutex); 468 gfs2_trans_end(sdp); 469 470 return 1; 471 } 472 473 static int pick_formal_ino_2(struct gfs2_sbd *sdp, uint64_t *formal_ino) 474 { 475 struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode); 476 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_inum_inode); 477 struct gfs2_holder gh; 478 struct buffer_head *bh; 479 struct gfs2_inum_range ir; 480 int error; 481 482 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 483 if (error) 484 return error; 485 486 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0); 487 if (error) 488 goto out; 489 mutex_lock(&sdp->sd_inum_mutex); 490 491 error = gfs2_meta_inode_buffer(ip, &bh); 492 if (error) 493 goto out_end_trans; 494 495 gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode)); 496 497 if (!ir.ir_length) { 498 struct buffer_head *m_bh; 499 uint64_t x, y; 500 501 error = gfs2_meta_inode_buffer(m_ip, &m_bh); 502 if (error) 503 goto out_brelse; 504 505 x = *(uint64_t *)(m_bh->b_data + sizeof(struct gfs2_dinode)); 506 x = y = be64_to_cpu(x); 507 ir.ir_start = x; 508 ir.ir_length = GFS2_INUM_QUANTUM; 509 x += GFS2_INUM_QUANTUM; 510 if (x < y) 511 gfs2_consist_inode(m_ip); 512 x = cpu_to_be64(x); 513 gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1); 514 *(uint64_t *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = x; 515 516 brelse(m_bh); 517 } 518 519 *formal_ino = ir.ir_start++; 520 ir.ir_length--; 521 522 gfs2_trans_add_bh(ip->i_gl, bh, 1); 523 gfs2_inum_range_out(&ir, bh->b_data + sizeof(struct gfs2_dinode)); 524 525 out_brelse: 526 brelse(bh); 527 528 out_end_trans: 529 mutex_unlock(&sdp->sd_inum_mutex); 530 gfs2_trans_end(sdp); 531 532 out: 533 gfs2_glock_dq_uninit(&gh); 534 535 return error; 536 } 537 538 static int pick_formal_ino(struct gfs2_sbd *sdp, uint64_t *inum) 539 { 540 int error; 541 542 error = pick_formal_ino_1(sdp, inum); 543 if (error <= 0) 544 return error; 545 546 error = pick_formal_ino_2(sdp, inum); 547 548 return error; 549 } 550 551 /** 552 * create_ok - OK to create a new on-disk inode here? 553 * @dip: Directory in which dinode is to be created 554 * @name: Name of new dinode 555 * @mode: 556 * 557 * Returns: errno 558 */ 559 560 static int create_ok(struct gfs2_inode *dip, const struct qstr *name, 561 unsigned int mode) 562 { 563 int error; 564 565 error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL); 566 if (error) 567 return error; 568 569 /* Don't create entries in an unlinked directory */ 570 if (!dip->i_di.di_nlink) 571 return -EPERM; 572 573 error = gfs2_dir_search(&dip->i_inode, name, NULL, NULL); 574 switch (error) { 575 case -ENOENT: 576 error = 0; 577 break; 578 case 0: 579 return -EEXIST; 580 default: 581 return error; 582 } 583 584 if (dip->i_di.di_entries == (uint32_t)-1) 585 return -EFBIG; 586 if (S_ISDIR(mode) && dip->i_di.di_nlink == (uint32_t)-1) 587 return -EMLINK; 588 589 return 0; 590 } 591 592 static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode, 593 unsigned int *uid, unsigned int *gid) 594 { 595 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir && 596 (dip->i_di.di_mode & S_ISUID) && 597 dip->i_di.di_uid) { 598 if (S_ISDIR(*mode)) 599 *mode |= S_ISUID; 600 else if (dip->i_di.di_uid != current->fsuid) 601 *mode &= ~07111; 602 *uid = dip->i_di.di_uid; 603 } else 604 *uid = current->fsuid; 605 606 if (dip->i_di.di_mode & S_ISGID) { 607 if (S_ISDIR(*mode)) 608 *mode |= S_ISGID; 609 *gid = dip->i_di.di_gid; 610 } else 611 *gid = current->fsgid; 612 } 613 614 static int alloc_dinode(struct gfs2_inode *dip, struct gfs2_inum *inum, 615 u64 *generation) 616 { 617 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 618 int error; 619 620 gfs2_alloc_get(dip); 621 622 dip->i_alloc.al_requested = RES_DINODE; 623 error = gfs2_inplace_reserve(dip); 624 if (error) 625 goto out; 626 627 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0); 628 if (error) 629 goto out_ipreserv; 630 631 inum->no_addr = gfs2_alloc_di(dip, generation); 632 633 gfs2_trans_end(sdp); 634 635 out_ipreserv: 636 gfs2_inplace_release(dip); 637 638 out: 639 gfs2_alloc_put(dip); 640 641 return error; 642 } 643 644 /** 645 * init_dinode - Fill in a new dinode structure 646 * @dip: the directory this inode is being created in 647 * @gl: The glock covering the new inode 648 * @inum: the inode number 649 * @mode: the file permissions 650 * @uid: 651 * @gid: 652 * 653 */ 654 655 static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, 656 const struct gfs2_inum *inum, unsigned int mode, 657 unsigned int uid, unsigned int gid, 658 const u64 *generation) 659 { 660 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 661 struct gfs2_dinode *di; 662 struct buffer_head *dibh; 663 664 dibh = gfs2_meta_new(gl, inum->no_addr); 665 gfs2_trans_add_bh(gl, dibh, 1); 666 gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI); 667 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); 668 di = (struct gfs2_dinode *)dibh->b_data; 669 670 di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino); 671 di->di_num.no_addr = cpu_to_be64(inum->no_addr); 672 di->di_mode = cpu_to_be32(mode); 673 di->di_uid = cpu_to_be32(uid); 674 di->di_gid = cpu_to_be32(gid); 675 di->di_nlink = cpu_to_be32(0); 676 di->di_size = cpu_to_be64(0); 677 di->di_blocks = cpu_to_be64(1); 678 di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(get_seconds()); 679 di->di_major = di->di_minor = cpu_to_be32(0); 680 di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr); 681 di->di_generation = cpu_to_be64(*generation); 682 di->di_flags = cpu_to_be32(0); 683 684 if (S_ISREG(mode)) { 685 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA) || 686 gfs2_tune_get(sdp, gt_new_files_jdata)) 687 di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA); 688 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO) || 689 gfs2_tune_get(sdp, gt_new_files_directio)) 690 di->di_flags |= cpu_to_be32(GFS2_DIF_DIRECTIO); 691 } else if (S_ISDIR(mode)) { 692 di->di_flags |= cpu_to_be32(dip->i_di.di_flags & 693 GFS2_DIF_INHERIT_DIRECTIO); 694 di->di_flags |= cpu_to_be32(dip->i_di.di_flags & 695 GFS2_DIF_INHERIT_JDATA); 696 } 697 698 di->__pad1 = 0; 699 di->di_payload_format = cpu_to_be32(0); 700 di->di_height = cpu_to_be32(0); 701 di->__pad2 = 0; 702 di->__pad3 = 0; 703 di->di_depth = cpu_to_be16(0); 704 di->di_entries = cpu_to_be32(0); 705 memset(&di->__pad4, 0, sizeof(di->__pad4)); 706 di->di_eattr = cpu_to_be64(0); 707 memset(&di->di_reserved, 0, sizeof(di->di_reserved)); 708 709 brelse(dibh); 710 } 711 712 static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, 713 unsigned int mode, const struct gfs2_inum *inum, 714 const u64 *generation) 715 { 716 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 717 unsigned int uid, gid; 718 int error; 719 720 munge_mode_uid_gid(dip, &mode, &uid, &gid); 721 gfs2_alloc_get(dip); 722 723 error = gfs2_quota_lock(dip, uid, gid); 724 if (error) 725 goto out; 726 727 error = gfs2_quota_check(dip, uid, gid); 728 if (error) 729 goto out_quota; 730 731 error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0); 732 if (error) 733 goto out_quota; 734 735 init_dinode(dip, gl, inum, mode, uid, gid, generation); 736 gfs2_quota_change(dip, +1, uid, gid); 737 gfs2_trans_end(sdp); 738 739 out_quota: 740 gfs2_quota_unlock(dip); 741 out: 742 gfs2_alloc_put(dip); 743 return error; 744 } 745 746 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, 747 struct gfs2_inode *ip) 748 { 749 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 750 struct gfs2_alloc *al; 751 int alloc_required; 752 struct buffer_head *dibh; 753 int error; 754 755 al = gfs2_alloc_get(dip); 756 757 error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); 758 if (error) 759 goto fail; 760 761 error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name); 762 if (alloc_required < 0) 763 goto fail; 764 if (alloc_required) { 765 error = gfs2_quota_check(dip, dip->i_di.di_uid, 766 dip->i_di.di_gid); 767 if (error) 768 goto fail_quota_locks; 769 770 al->al_requested = sdp->sd_max_dirres; 771 772 error = gfs2_inplace_reserve(dip); 773 if (error) 774 goto fail_quota_locks; 775 776 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + 777 al->al_rgd->rd_ri.ri_length + 778 2 * RES_DINODE + 779 RES_STATFS + RES_QUOTA, 0); 780 if (error) 781 goto fail_ipreserv; 782 } else { 783 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); 784 if (error) 785 goto fail_quota_locks; 786 } 787 788 error = gfs2_dir_add(&dip->i_inode, name, &ip->i_num, IF2DT(ip->i_di.di_mode)); 789 if (error) 790 goto fail_end_trans; 791 792 error = gfs2_meta_inode_buffer(ip, &dibh); 793 if (error) 794 goto fail_end_trans; 795 ip->i_di.di_nlink = 1; 796 gfs2_trans_add_bh(ip->i_gl, dibh, 1); 797 gfs2_dinode_out(&ip->i_di, dibh->b_data); 798 brelse(dibh); 799 return 0; 800 801 fail_end_trans: 802 gfs2_trans_end(sdp); 803 804 fail_ipreserv: 805 if (dip->i_alloc.al_rgd) 806 gfs2_inplace_release(dip); 807 808 fail_quota_locks: 809 gfs2_quota_unlock(dip); 810 811 fail: 812 gfs2_alloc_put(dip); 813 return error; 814 } 815 816 /** 817 * gfs2_createi - Create a new inode 818 * @ghs: An array of two holders 819 * @name: The name of the new file 820 * @mode: the permissions on the new inode 821 * 822 * @ghs[0] is an initialized holder for the directory 823 * @ghs[1] is the holder for the inode lock 824 * 825 * If the return value is not NULL, the glocks on both the directory and the new 826 * file are held. A transaction has been started and an inplace reservation 827 * is held, as well. 828 * 829 * Returns: An inode 830 */ 831 832 struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name, 833 unsigned int mode) 834 { 835 struct inode *inode; 836 struct gfs2_inode *dip = ghs->gh_gl->gl_object; 837 struct inode *dir = &dip->i_inode; 838 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 839 struct gfs2_inum inum; 840 int error; 841 u64 generation; 842 843 if (!name->len || name->len > GFS2_FNAMESIZE) 844 return ERR_PTR(-ENAMETOOLONG); 845 846 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs); 847 error = gfs2_glock_nq(ghs); 848 if (error) 849 goto fail; 850 851 error = create_ok(dip, name, mode); 852 if (error) 853 goto fail_gunlock; 854 855 error = pick_formal_ino(sdp, &inum.no_formal_ino); 856 if (error) 857 goto fail_gunlock; 858 859 error = alloc_dinode(dip, &inum, &generation); 860 if (error) 861 goto fail_gunlock; 862 863 if (inum.no_addr < dip->i_num.no_addr) { 864 gfs2_glock_dq(ghs); 865 866 error = gfs2_glock_nq_num(sdp, inum.no_addr, 867 &gfs2_inode_glops, LM_ST_EXCLUSIVE, 868 GL_SKIP, ghs + 1); 869 if (error) { 870 return ERR_PTR(error); 871 } 872 873 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs); 874 error = gfs2_glock_nq(ghs); 875 if (error) { 876 gfs2_glock_dq_uninit(ghs + 1); 877 return ERR_PTR(error); 878 } 879 880 error = create_ok(dip, name, mode); 881 if (error) 882 goto fail_gunlock2; 883 } else { 884 error = gfs2_glock_nq_num(sdp, inum.no_addr, 885 &gfs2_inode_glops, LM_ST_EXCLUSIVE, 886 GL_SKIP, ghs + 1); 887 if (error) 888 goto fail_gunlock; 889 } 890 891 error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation); 892 if (error) 893 goto fail_gunlock2; 894 895 inode = gfs2_inode_lookup(dir->i_sb, &inum, IF2DT(mode)); 896 if (IS_ERR(inode)) 897 goto fail_gunlock2; 898 899 error = gfs2_inode_refresh(GFS2_I(inode)); 900 if (error) 901 goto fail_iput; 902 903 error = gfs2_acl_create(dip, GFS2_I(inode)); 904 if (error) 905 goto fail_iput; 906 907 error = link_dinode(dip, name, GFS2_I(inode)); 908 if (error) 909 goto fail_iput; 910 911 if (!inode) 912 return ERR_PTR(-ENOMEM); 913 return inode; 914 915 fail_iput: 916 iput(inode); 917 fail_gunlock2: 918 gfs2_glock_dq_uninit(ghs + 1); 919 fail_gunlock: 920 gfs2_glock_dq(ghs); 921 fail: 922 return ERR_PTR(error); 923 } 924 925 /** 926 * gfs2_rmdiri - Remove a directory 927 * @dip: The parent directory of the directory to be removed 928 * @name: The name of the directory to be removed 929 * @ip: The GFS2 inode of the directory to be removed 930 * 931 * Assumes Glocks on dip and ip are held 932 * 933 * Returns: errno 934 */ 935 936 int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name, 937 struct gfs2_inode *ip) 938 { 939 struct qstr dotname; 940 int error; 941 942 if (ip->i_di.di_entries != 2) { 943 if (gfs2_consist_inode(ip)) 944 gfs2_dinode_print(&ip->i_di); 945 return -EIO; 946 } 947 948 error = gfs2_dir_del(dip, name); 949 if (error) 950 return error; 951 952 error = gfs2_change_nlink(dip, -1); 953 if (error) 954 return error; 955 956 gfs2_str2qstr(&dotname, "."); 957 error = gfs2_dir_del(ip, &dotname); 958 if (error) 959 return error; 960 961 gfs2_str2qstr(&dotname, ".."); 962 error = gfs2_dir_del(ip, &dotname); 963 if (error) 964 return error; 965 966 error = gfs2_change_nlink(ip, -2); 967 if (error) 968 return error; 969 970 return error; 971 } 972 973 /* 974 * gfs2_unlink_ok - check to see that a inode is still in a directory 975 * @dip: the directory 976 * @name: the name of the file 977 * @ip: the inode 978 * 979 * Assumes that the lock on (at least) @dip is held. 980 * 981 * Returns: 0 if the parent/child relationship is correct, errno if it isn't 982 */ 983 984 int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, 985 struct gfs2_inode *ip) 986 { 987 struct gfs2_inum inum; 988 unsigned int type; 989 int error; 990 991 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) 992 return -EPERM; 993 994 if ((dip->i_di.di_mode & S_ISVTX) && 995 dip->i_di.di_uid != current->fsuid && 996 ip->i_di.di_uid != current->fsuid && !capable(CAP_FOWNER)) 997 return -EPERM; 998 999 if (IS_APPEND(&dip->i_inode)) 1000 return -EPERM; 1001 1002 error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL); 1003 if (error) 1004 return error; 1005 1006 error = gfs2_dir_search(&dip->i_inode, name, &inum, &type); 1007 if (error) 1008 return error; 1009 1010 if (!gfs2_inum_equal(&inum, &ip->i_num)) 1011 return -ENOENT; 1012 1013 if (IF2DT(ip->i_di.di_mode) != type) { 1014 gfs2_consist_inode(dip); 1015 return -EIO; 1016 } 1017 1018 return 0; 1019 } 1020 1021 /* 1022 * gfs2_ok_to_move - check if it's ok to move a directory to another directory 1023 * @this: move this 1024 * @to: to here 1025 * 1026 * Follow @to back to the root and make sure we don't encounter @this 1027 * Assumes we already hold the rename lock. 1028 * 1029 * Returns: errno 1030 */ 1031 1032 int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) 1033 { 1034 struct inode *dir = &to->i_inode; 1035 struct super_block *sb = dir->i_sb; 1036 struct inode *tmp; 1037 struct qstr dotdot; 1038 int error = 0; 1039 1040 gfs2_str2qstr(&dotdot, ".."); 1041 1042 igrab(dir); 1043 1044 for (;;) { 1045 if (dir == &this->i_inode) { 1046 error = -EINVAL; 1047 break; 1048 } 1049 if (dir == sb->s_root->d_inode) { 1050 error = 0; 1051 break; 1052 } 1053 1054 tmp = gfs2_lookupi(dir, &dotdot, 1, NULL); 1055 if (IS_ERR(tmp)) { 1056 error = PTR_ERR(tmp); 1057 break; 1058 } 1059 1060 iput(dir); 1061 dir = tmp; 1062 } 1063 1064 iput(dir); 1065 1066 return error; 1067 } 1068 1069 /** 1070 * gfs2_readlinki - return the contents of a symlink 1071 * @ip: the symlink's inode 1072 * @buf: a pointer to the buffer to be filled 1073 * @len: a pointer to the length of @buf 1074 * 1075 * If @buf is too small, a piece of memory is kmalloc()ed and needs 1076 * to be freed by the caller. 1077 * 1078 * Returns: errno 1079 */ 1080 1081 int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len) 1082 { 1083 struct gfs2_holder i_gh; 1084 struct buffer_head *dibh; 1085 unsigned int x; 1086 int error; 1087 1088 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh); 1089 error = gfs2_glock_nq_atime(&i_gh); 1090 if (error) { 1091 gfs2_holder_uninit(&i_gh); 1092 return error; 1093 } 1094 1095 if (!ip->i_di.di_size) { 1096 gfs2_consist_inode(ip); 1097 error = -EIO; 1098 goto out; 1099 } 1100 1101 error = gfs2_meta_inode_buffer(ip, &dibh); 1102 if (error) 1103 goto out; 1104 1105 x = ip->i_di.di_size + 1; 1106 if (x > *len) { 1107 *buf = kmalloc(x, GFP_KERNEL); 1108 if (!*buf) { 1109 error = -ENOMEM; 1110 goto out_brelse; 1111 } 1112 } 1113 1114 memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x); 1115 *len = x; 1116 1117 out_brelse: 1118 brelse(dibh); 1119 out: 1120 gfs2_glock_dq_uninit(&i_gh); 1121 return error; 1122 } 1123 1124 /** 1125 * gfs2_glock_nq_atime - Acquire a hold on an inode's glock, and 1126 * conditionally update the inode's atime 1127 * @gh: the holder to acquire 1128 * 1129 * Tests atime (access time) for gfs2_read, gfs2_readdir and gfs2_mmap 1130 * Update if the difference between the current time and the inode's current 1131 * atime is greater than an interval specified at mount. 1132 * 1133 * Returns: errno 1134 */ 1135 1136 int gfs2_glock_nq_atime(struct gfs2_holder *gh) 1137 { 1138 struct gfs2_glock *gl = gh->gh_gl; 1139 struct gfs2_sbd *sdp = gl->gl_sbd; 1140 struct gfs2_inode *ip = gl->gl_object; 1141 int64_t curtime, quantum = gfs2_tune_get(sdp, gt_atime_quantum); 1142 unsigned int state; 1143 int flags; 1144 int error; 1145 1146 if (gfs2_assert_warn(sdp, gh->gh_flags & GL_ATIME) || 1147 gfs2_assert_warn(sdp, !(gh->gh_flags & GL_ASYNC)) || 1148 gfs2_assert_warn(sdp, gl->gl_ops == &gfs2_inode_glops)) 1149 return -EINVAL; 1150 1151 state = gh->gh_state; 1152 flags = gh->gh_flags; 1153 1154 error = gfs2_glock_nq(gh); 1155 if (error) 1156 return error; 1157 1158 if (test_bit(SDF_NOATIME, &sdp->sd_flags) || 1159 (sdp->sd_vfs->s_flags & MS_RDONLY)) 1160 return 0; 1161 1162 curtime = get_seconds(); 1163 if (curtime - ip->i_di.di_atime >= quantum) { 1164 gfs2_glock_dq(gh); 1165 gfs2_holder_reinit(LM_ST_EXCLUSIVE, gh->gh_flags & ~LM_FLAG_ANY, 1166 gh); 1167 error = gfs2_glock_nq(gh); 1168 if (error) 1169 return error; 1170 1171 /* Verify that atime hasn't been updated while we were 1172 trying to get exclusive lock. */ 1173 1174 curtime = get_seconds(); 1175 if (curtime - ip->i_di.di_atime >= quantum) { 1176 struct buffer_head *dibh; 1177 1178 error = gfs2_trans_begin(sdp, RES_DINODE, 0); 1179 if (error == -EROFS) 1180 return 0; 1181 if (error) 1182 goto fail; 1183 1184 error = gfs2_meta_inode_buffer(ip, &dibh); 1185 if (error) 1186 goto fail_end_trans; 1187 1188 ip->i_di.di_atime = curtime; 1189 1190 gfs2_trans_add_bh(ip->i_gl, dibh, 1); 1191 gfs2_dinode_out(&ip->i_di, dibh->b_data); 1192 brelse(dibh); 1193 1194 gfs2_trans_end(sdp); 1195 } 1196 1197 /* If someone else has asked for the glock, 1198 unlock and let them have it. Then reacquire 1199 in the original state. */ 1200 if (gfs2_glock_is_blocking(gl)) { 1201 gfs2_glock_dq(gh); 1202 gfs2_holder_reinit(state, flags, gh); 1203 return gfs2_glock_nq(gh); 1204 } 1205 } 1206 1207 return 0; 1208 1209 fail_end_trans: 1210 gfs2_trans_end(sdp); 1211 fail: 1212 gfs2_glock_dq(gh); 1213 return error; 1214 } 1215 1216 /** 1217 * glock_compare_atime - Compare two struct gfs2_glock structures for sort 1218 * @arg_a: the first structure 1219 * @arg_b: the second structure 1220 * 1221 * Returns: 1 if A > B 1222 * -1 if A < B 1223 * 0 if A = B 1224 */ 1225 1226 static int glock_compare_atime(const void *arg_a, const void *arg_b) 1227 { 1228 struct gfs2_holder *gh_a = *(struct gfs2_holder **)arg_a; 1229 struct gfs2_holder *gh_b = *(struct gfs2_holder **)arg_b; 1230 struct lm_lockname *a = &gh_a->gh_gl->gl_name; 1231 struct lm_lockname *b = &gh_b->gh_gl->gl_name; 1232 int ret = 0; 1233 1234 if (a->ln_number > b->ln_number) 1235 ret = 1; 1236 else if (a->ln_number < b->ln_number) 1237 ret = -1; 1238 else { 1239 if (gh_a->gh_state == LM_ST_SHARED && 1240 gh_b->gh_state == LM_ST_EXCLUSIVE) 1241 ret = 1; 1242 else if (gh_a->gh_state == LM_ST_SHARED && 1243 (gh_b->gh_flags & GL_ATIME)) 1244 ret = 1; 1245 } 1246 1247 return ret; 1248 } 1249 1250 /** 1251 * gfs2_glock_nq_m_atime - acquire multiple glocks where one may need an 1252 * atime update 1253 * @num_gh: the number of structures 1254 * @ghs: an array of struct gfs2_holder structures 1255 * 1256 * Returns: 0 on success (all glocks acquired), 1257 * errno on failure (no glocks acquired) 1258 */ 1259 1260 int gfs2_glock_nq_m_atime(unsigned int num_gh, struct gfs2_holder *ghs) 1261 { 1262 struct gfs2_holder **p; 1263 unsigned int x; 1264 int error = 0; 1265 1266 if (!num_gh) 1267 return 0; 1268 1269 if (num_gh == 1) { 1270 ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); 1271 if (ghs->gh_flags & GL_ATIME) 1272 error = gfs2_glock_nq_atime(ghs); 1273 else 1274 error = gfs2_glock_nq(ghs); 1275 return error; 1276 } 1277 1278 p = kcalloc(num_gh, sizeof(struct gfs2_holder *), GFP_KERNEL); 1279 if (!p) 1280 return -ENOMEM; 1281 1282 for (x = 0; x < num_gh; x++) 1283 p[x] = &ghs[x]; 1284 1285 sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare_atime,NULL); 1286 1287 for (x = 0; x < num_gh; x++) { 1288 p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); 1289 1290 if (p[x]->gh_flags & GL_ATIME) 1291 error = gfs2_glock_nq_atime(p[x]); 1292 else 1293 error = gfs2_glock_nq(p[x]); 1294 1295 if (error) { 1296 while (x--) 1297 gfs2_glock_dq(p[x]); 1298 break; 1299 } 1300 } 1301 1302 kfree(p); 1303 1304 return error; 1305 } 1306 1307 1308 static int 1309 __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr) 1310 { 1311 struct buffer_head *dibh; 1312 int error; 1313 1314 error = gfs2_meta_inode_buffer(ip, &dibh); 1315 if (!error) { 1316 error = inode_setattr(&ip->i_inode, attr); 1317 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error); 1318 gfs2_inode_attr_out(ip); 1319 1320 gfs2_trans_add_bh(ip->i_gl, dibh, 1); 1321 gfs2_dinode_out(&ip->i_di, dibh->b_data); 1322 brelse(dibh); 1323 } 1324 return error; 1325 } 1326 1327 /** 1328 * gfs2_setattr_simple - 1329 * @ip: 1330 * @attr: 1331 * 1332 * Called with a reference on the vnode. 1333 * 1334 * Returns: errno 1335 */ 1336 1337 int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr) 1338 { 1339 int error; 1340 1341 if (current->journal_info) 1342 return __gfs2_setattr_simple(ip, attr); 1343 1344 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0); 1345 if (error) 1346 return error; 1347 1348 error = __gfs2_setattr_simple(ip, attr); 1349 1350 gfs2_trans_end(GFS2_SB(&ip->i_inode)); 1351 1352 return error; 1353 } 1354 1355