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 version 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 #include <linux/lm_interface.h> 20 #include <linux/security.h> 21 22 #include "gfs2.h" 23 #include "incore.h" 24 #include "acl.h" 25 #include "bmap.h" 26 #include "dir.h" 27 #include "eattr.h" 28 #include "glock.h" 29 #include "glops.h" 30 #include "inode.h" 31 #include "log.h" 32 #include "meta_io.h" 33 #include "ops_address.h" 34 #include "ops_file.h" 35 #include "ops_inode.h" 36 #include "quota.h" 37 #include "rgrp.h" 38 #include "trans.h" 39 #include "util.h" 40 41 /** 42 * gfs2_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 void gfs2_inode_attr_in(struct gfs2_inode *ip) 49 { 50 struct inode *inode = &ip->i_inode; 51 struct gfs2_dinode_host *di = &ip->i_di; 52 53 inode->i_ino = ip->i_num.no_addr; 54 55 switch (di->di_mode & S_IFMT) { 56 case S_IFBLK: 57 case S_IFCHR: 58 inode->i_rdev = MKDEV(di->di_major, di->di_minor); 59 break; 60 default: 61 inode->i_rdev = 0; 62 break; 63 }; 64 65 inode->i_mode = di->di_mode; 66 inode->i_nlink = di->di_nlink; 67 inode->i_uid = di->di_uid; 68 inode->i_gid = di->di_gid; 69 i_size_write(inode, di->di_size); 70 inode->i_atime.tv_sec = di->di_atime; 71 inode->i_mtime.tv_sec = di->di_mtime; 72 inode->i_ctime.tv_sec = di->di_ctime; 73 inode->i_atime.tv_nsec = 0; 74 inode->i_mtime.tv_nsec = 0; 75 inode->i_ctime.tv_nsec = 0; 76 inode->i_blocks = di->di_blocks << 77 (GFS2_SB(inode)->sd_sb.sb_bsize_shift - GFS2_BASIC_BLOCK_SHIFT); 78 79 if (di->di_flags & GFS2_DIF_IMMUTABLE) 80 inode->i_flags |= S_IMMUTABLE; 81 else 82 inode->i_flags &= ~S_IMMUTABLE; 83 84 if (di->di_flags & GFS2_DIF_APPENDONLY) 85 inode->i_flags |= S_APPEND; 86 else 87 inode->i_flags &= ~S_APPEND; 88 } 89 90 /** 91 * gfs2_inode_attr_out - Copy attributes from VFS inode into the dinode 92 * @ip: The GFS2 inode 93 * 94 * Only copy out the attributes that we want the VFS layer 95 * to be able to modify. 96 */ 97 98 void gfs2_inode_attr_out(struct gfs2_inode *ip) 99 { 100 struct inode *inode = &ip->i_inode; 101 struct gfs2_dinode_host *di = &ip->i_di; 102 gfs2_assert_withdraw(GFS2_SB(inode), 103 (di->di_mode & S_IFMT) == (inode->i_mode & S_IFMT)); 104 di->di_mode = inode->i_mode; 105 di->di_uid = inode->i_uid; 106 di->di_gid = inode->i_gid; 107 di->di_atime = inode->i_atime.tv_sec; 108 di->di_mtime = inode->i_mtime.tv_sec; 109 di->di_ctime = inode->i_ctime.tv_sec; 110 } 111 112 static int iget_test(struct inode *inode, void *opaque) 113 { 114 struct gfs2_inode *ip = GFS2_I(inode); 115 struct gfs2_inum_host *inum = opaque; 116 117 if (ip && ip->i_num.no_addr == inum->no_addr) 118 return 1; 119 120 return 0; 121 } 122 123 static int iget_set(struct inode *inode, void *opaque) 124 { 125 struct gfs2_inode *ip = GFS2_I(inode); 126 struct gfs2_inum_host *inum = opaque; 127 128 ip->i_num = *inum; 129 return 0; 130 } 131 132 struct inode *gfs2_ilookup(struct super_block *sb, struct gfs2_inum_host *inum) 133 { 134 return ilookup5(sb, (unsigned long)inum->no_formal_ino, 135 iget_test, inum); 136 } 137 138 static struct inode *gfs2_iget(struct super_block *sb, struct gfs2_inum_host *inum) 139 { 140 return iget5_locked(sb, (unsigned long)inum->no_formal_ino, 141 iget_test, iget_set, inum); 142 } 143 144 /** 145 * gfs2_inode_lookup - Lookup an inode 146 * @sb: The super block 147 * @inum: The inode number 148 * @type: The type of the inode 149 * 150 * Returns: A VFS inode, or an error 151 */ 152 153 struct inode *gfs2_inode_lookup(struct super_block *sb, struct gfs2_inum_host *inum, unsigned int type) 154 { 155 struct inode *inode = gfs2_iget(sb, inum); 156 struct gfs2_inode *ip = GFS2_I(inode); 157 struct gfs2_glock *io_gl; 158 int error; 159 160 if (!inode) 161 return ERR_PTR(-ENOBUFS); 162 163 if (inode->i_state & I_NEW) { 164 struct gfs2_sbd *sdp = GFS2_SB(inode); 165 umode_t mode = DT2IF(type); 166 inode->i_private = ip; 167 inode->i_mode = mode; 168 169 if (S_ISREG(mode)) { 170 inode->i_op = &gfs2_file_iops; 171 inode->i_fop = &gfs2_file_fops; 172 inode->i_mapping->a_ops = &gfs2_file_aops; 173 } else if (S_ISDIR(mode)) { 174 inode->i_op = &gfs2_dir_iops; 175 inode->i_fop = &gfs2_dir_fops; 176 } else if (S_ISLNK(mode)) { 177 inode->i_op = &gfs2_symlink_iops; 178 } else { 179 inode->i_op = &gfs2_dev_iops; 180 } 181 182 error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); 183 if (unlikely(error)) 184 goto fail; 185 ip->i_gl->gl_object = ip; 186 187 error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_iopen_glops, CREATE, &io_gl); 188 if (unlikely(error)) 189 goto fail_put; 190 191 ip->i_vn = ip->i_gl->gl_vn - 1; 192 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); 193 if (unlikely(error)) 194 goto fail_iopen; 195 196 gfs2_glock_put(io_gl); 197 unlock_new_inode(inode); 198 } 199 200 return inode; 201 fail_iopen: 202 gfs2_glock_put(io_gl); 203 fail_put: 204 ip->i_gl->gl_object = NULL; 205 gfs2_glock_put(ip->i_gl); 206 fail: 207 iput(inode); 208 return ERR_PTR(error); 209 } 210 211 /** 212 * gfs2_inode_refresh - Refresh the incore copy of the dinode 213 * @ip: The GFS2 inode 214 * 215 * Returns: errno 216 */ 217 218 int gfs2_inode_refresh(struct gfs2_inode *ip) 219 { 220 struct buffer_head *dibh; 221 int error; 222 223 error = gfs2_meta_inode_buffer(ip, &dibh); 224 if (error) 225 return error; 226 227 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), dibh, GFS2_METATYPE_DI)) { 228 brelse(dibh); 229 return -EIO; 230 } 231 232 gfs2_dinode_in(&ip->i_di, dibh->b_data); 233 234 brelse(dibh); 235 236 if (ip->i_num.no_addr != ip->i_di.di_num.no_addr) { 237 if (gfs2_consist_inode(ip)) 238 gfs2_dinode_print(&ip->i_di); 239 return -EIO; 240 } 241 if (ip->i_num.no_formal_ino != ip->i_di.di_num.no_formal_ino) 242 return -ESTALE; 243 244 ip->i_vn = ip->i_gl->gl_vn; 245 246 return 0; 247 } 248 249 int gfs2_dinode_dealloc(struct gfs2_inode *ip) 250 { 251 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 252 struct gfs2_alloc *al; 253 struct gfs2_rgrpd *rgd; 254 int error; 255 256 if (ip->i_di.di_blocks != 1) { 257 if (gfs2_consist_inode(ip)) 258 gfs2_dinode_print(&ip->i_di); 259 return -EIO; 260 } 261 262 al = gfs2_alloc_get(ip); 263 264 error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); 265 if (error) 266 goto out; 267 268 error = gfs2_rindex_hold(sdp, &al->al_ri_gh); 269 if (error) 270 goto out_qs; 271 272 rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr); 273 if (!rgd) { 274 gfs2_consist_inode(ip); 275 error = -EIO; 276 goto out_rindex_relse; 277 } 278 279 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, 280 &al->al_rgd_gh); 281 if (error) 282 goto out_rindex_relse; 283 284 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 1); 285 if (error) 286 goto out_rg_gunlock; 287 288 gfs2_trans_add_gl(ip->i_gl); 289 290 gfs2_free_di(rgd, ip); 291 292 gfs2_trans_end(sdp); 293 clear_bit(GLF_STICKY, &ip->i_gl->gl_flags); 294 295 out_rg_gunlock: 296 gfs2_glock_dq_uninit(&al->al_rgd_gh); 297 out_rindex_relse: 298 gfs2_glock_dq_uninit(&al->al_ri_gh); 299 out_qs: 300 gfs2_quota_unhold(ip); 301 out: 302 gfs2_alloc_put(ip); 303 return error; 304 } 305 306 /** 307 * gfs2_change_nlink - Change nlink count on inode 308 * @ip: The GFS2 inode 309 * @diff: The change in the nlink count required 310 * 311 * Returns: errno 312 */ 313 314 int gfs2_change_nlink(struct gfs2_inode *ip, int diff) 315 { 316 struct gfs2_sbd *sdp = ip->i_inode.i_sb->s_fs_info; 317 struct buffer_head *dibh; 318 u32 nlink; 319 int error; 320 321 BUG_ON(ip->i_di.di_nlink != ip->i_inode.i_nlink); 322 nlink = ip->i_di.di_nlink + diff; 323 324 /* If we are reducing the nlink count, but the new value ends up being 325 bigger than the old one, we must have underflowed. */ 326 if (diff < 0 && nlink > ip->i_di.di_nlink) { 327 if (gfs2_consist_inode(ip)) 328 gfs2_dinode_print(&ip->i_di); 329 return -EIO; 330 } 331 332 error = gfs2_meta_inode_buffer(ip, &dibh); 333 if (error) 334 return error; 335 336 ip->i_di.di_nlink = nlink; 337 ip->i_di.di_ctime = get_seconds(); 338 ip->i_inode.i_nlink = nlink; 339 340 gfs2_trans_add_bh(ip->i_gl, dibh, 1); 341 gfs2_dinode_out(&ip->i_di, dibh->b_data); 342 brelse(dibh); 343 mark_inode_dirty(&ip->i_inode); 344 345 if (ip->i_di.di_nlink == 0) { 346 struct gfs2_rgrpd *rgd; 347 struct gfs2_holder ri_gh, rg_gh; 348 349 error = gfs2_rindex_hold(sdp, &ri_gh); 350 if (error) 351 goto out; 352 error = -EIO; 353 rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr); 354 if (!rgd) 355 goto out_norgrp; 356 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh); 357 if (error) 358 goto out_norgrp; 359 360 clear_nlink(&ip->i_inode); 361 gfs2_unlink_di(&ip->i_inode); /* mark inode unlinked */ 362 gfs2_glock_dq_uninit(&rg_gh); 363 out_norgrp: 364 gfs2_glock_dq_uninit(&ri_gh); 365 } 366 out: 367 return error; 368 } 369 370 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name) 371 { 372 struct qstr qstr; 373 gfs2_str2qstr(&qstr, name); 374 return gfs2_lookupi(dip, &qstr, 1, NULL); 375 } 376 377 378 /** 379 * gfs2_lookupi - Look up a filename in a directory and return its inode 380 * @d_gh: An initialized holder for the directory glock 381 * @name: The name of the inode to look for 382 * @is_root: If 1, ignore the caller's permissions 383 * @i_gh: An uninitialized holder for the new inode glock 384 * 385 * There will always be a vnode (Linux VFS inode) for the d_gh inode unless 386 * @is_root is true. 387 * 388 * Returns: errno 389 */ 390 391 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name, 392 int is_root, struct nameidata *nd) 393 { 394 struct super_block *sb = dir->i_sb; 395 struct gfs2_inode *dip = GFS2_I(dir); 396 struct gfs2_holder d_gh; 397 struct gfs2_inum_host inum; 398 unsigned int type; 399 int error = 0; 400 struct inode *inode = NULL; 401 402 if (!name->len || name->len > GFS2_FNAMESIZE) 403 return ERR_PTR(-ENAMETOOLONG); 404 405 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) || 406 (name->len == 2 && memcmp(name->name, "..", 2) == 0 && 407 dir == sb->s_root->d_inode)) { 408 igrab(dir); 409 return dir; 410 } 411 412 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); 413 if (error) 414 return ERR_PTR(error); 415 416 if (!is_root) { 417 error = permission(dir, MAY_EXEC, NULL); 418 if (error) 419 goto out; 420 } 421 422 error = gfs2_dir_search(dir, name, &inum, &type); 423 if (error) 424 goto out; 425 426 inode = gfs2_inode_lookup(sb, &inum, type); 427 428 out: 429 gfs2_glock_dq_uninit(&d_gh); 430 if (error == -ENOENT) 431 return NULL; 432 return inode; 433 } 434 435 static int pick_formal_ino_1(struct gfs2_sbd *sdp, u64 *formal_ino) 436 { 437 struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode); 438 struct buffer_head *bh; 439 struct gfs2_inum_range_host ir; 440 int error; 441 442 error = gfs2_trans_begin(sdp, RES_DINODE, 0); 443 if (error) 444 return error; 445 mutex_lock(&sdp->sd_inum_mutex); 446 447 error = gfs2_meta_inode_buffer(ip, &bh); 448 if (error) { 449 mutex_unlock(&sdp->sd_inum_mutex); 450 gfs2_trans_end(sdp); 451 return error; 452 } 453 454 gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode)); 455 456 if (ir.ir_length) { 457 *formal_ino = ir.ir_start++; 458 ir.ir_length--; 459 gfs2_trans_add_bh(ip->i_gl, bh, 1); 460 gfs2_inum_range_out(&ir, 461 bh->b_data + sizeof(struct gfs2_dinode)); 462 brelse(bh); 463 mutex_unlock(&sdp->sd_inum_mutex); 464 gfs2_trans_end(sdp); 465 return 0; 466 } 467 468 brelse(bh); 469 470 mutex_unlock(&sdp->sd_inum_mutex); 471 gfs2_trans_end(sdp); 472 473 return 1; 474 } 475 476 static int pick_formal_ino_2(struct gfs2_sbd *sdp, u64 *formal_ino) 477 { 478 struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode); 479 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_inum_inode); 480 struct gfs2_holder gh; 481 struct buffer_head *bh; 482 struct gfs2_inum_range_host ir; 483 int error; 484 485 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 486 if (error) 487 return error; 488 489 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0); 490 if (error) 491 goto out; 492 mutex_lock(&sdp->sd_inum_mutex); 493 494 error = gfs2_meta_inode_buffer(ip, &bh); 495 if (error) 496 goto out_end_trans; 497 498 gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode)); 499 500 if (!ir.ir_length) { 501 struct buffer_head *m_bh; 502 u64 x, y; 503 504 error = gfs2_meta_inode_buffer(m_ip, &m_bh); 505 if (error) 506 goto out_brelse; 507 508 x = *(u64 *)(m_bh->b_data + sizeof(struct gfs2_dinode)); 509 x = y = be64_to_cpu(x); 510 ir.ir_start = x; 511 ir.ir_length = GFS2_INUM_QUANTUM; 512 x += GFS2_INUM_QUANTUM; 513 if (x < y) 514 gfs2_consist_inode(m_ip); 515 x = cpu_to_be64(x); 516 gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1); 517 *(u64 *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = x; 518 519 brelse(m_bh); 520 } 521 522 *formal_ino = ir.ir_start++; 523 ir.ir_length--; 524 525 gfs2_trans_add_bh(ip->i_gl, bh, 1); 526 gfs2_inum_range_out(&ir, bh->b_data + sizeof(struct gfs2_dinode)); 527 528 out_brelse: 529 brelse(bh); 530 out_end_trans: 531 mutex_unlock(&sdp->sd_inum_mutex); 532 gfs2_trans_end(sdp); 533 out: 534 gfs2_glock_dq_uninit(&gh); 535 return error; 536 } 537 538 static int pick_formal_ino(struct gfs2_sbd *sdp, u64 *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 == (u32)-1) 585 return -EFBIG; 586 if (S_ISDIR(mode) && dip->i_di.di_nlink == (u32)-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) && dip->i_di.di_uid) { 597 if (S_ISDIR(*mode)) 598 *mode |= S_ISUID; 599 else if (dip->i_di.di_uid != current->fsuid) 600 *mode &= ~07111; 601 *uid = dip->i_di.di_uid; 602 } else 603 *uid = current->fsuid; 604 605 if (dip->i_di.di_mode & S_ISGID) { 606 if (S_ISDIR(*mode)) 607 *mode |= S_ISGID; 608 *gid = dip->i_di.di_gid; 609 } else 610 *gid = current->fsgid; 611 } 612 613 static int alloc_dinode(struct gfs2_inode *dip, struct gfs2_inum_host *inum, 614 u64 *generation) 615 { 616 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 617 int error; 618 619 gfs2_alloc_get(dip); 620 621 dip->i_alloc.al_requested = RES_DINODE; 622 error = gfs2_inplace_reserve(dip); 623 if (error) 624 goto out; 625 626 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0); 627 if (error) 628 goto out_ipreserv; 629 630 inum->no_addr = gfs2_alloc_di(dip, generation); 631 632 gfs2_trans_end(sdp); 633 634 out_ipreserv: 635 gfs2_inplace_release(dip); 636 out: 637 gfs2_alloc_put(dip); 638 return error; 639 } 640 641 /** 642 * init_dinode - Fill in a new dinode structure 643 * @dip: the directory this inode is being created in 644 * @gl: The glock covering the new inode 645 * @inum: the inode number 646 * @mode: the file permissions 647 * @uid: 648 * @gid: 649 * 650 */ 651 652 static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, 653 const struct gfs2_inum_host *inum, unsigned int mode, 654 unsigned int uid, unsigned int gid, 655 const u64 *generation) 656 { 657 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 658 struct gfs2_dinode *di; 659 struct buffer_head *dibh; 660 661 dibh = gfs2_meta_new(gl, inum->no_addr); 662 gfs2_trans_add_bh(gl, dibh, 1); 663 gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI); 664 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); 665 di = (struct gfs2_dinode *)dibh->b_data; 666 667 di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino); 668 di->di_num.no_addr = cpu_to_be64(inum->no_addr); 669 di->di_mode = cpu_to_be32(mode); 670 di->di_uid = cpu_to_be32(uid); 671 di->di_gid = cpu_to_be32(gid); 672 di->di_nlink = cpu_to_be32(0); 673 di->di_size = cpu_to_be64(0); 674 di->di_blocks = cpu_to_be64(1); 675 di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(get_seconds()); 676 di->di_major = di->di_minor = cpu_to_be32(0); 677 di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr); 678 di->di_generation = cpu_to_be64(*generation); 679 di->di_flags = cpu_to_be32(0); 680 681 if (S_ISREG(mode)) { 682 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA) || 683 gfs2_tune_get(sdp, gt_new_files_jdata)) 684 di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA); 685 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO) || 686 gfs2_tune_get(sdp, gt_new_files_directio)) 687 di->di_flags |= cpu_to_be32(GFS2_DIF_DIRECTIO); 688 } else if (S_ISDIR(mode)) { 689 di->di_flags |= cpu_to_be32(dip->i_di.di_flags & 690 GFS2_DIF_INHERIT_DIRECTIO); 691 di->di_flags |= cpu_to_be32(dip->i_di.di_flags & 692 GFS2_DIF_INHERIT_JDATA); 693 } 694 695 di->__pad1 = 0; 696 di->di_payload_format = cpu_to_be32(0); 697 di->di_height = cpu_to_be32(0); 698 di->__pad2 = 0; 699 di->__pad3 = 0; 700 di->di_depth = cpu_to_be16(0); 701 di->di_entries = cpu_to_be32(0); 702 memset(&di->__pad4, 0, sizeof(di->__pad4)); 703 di->di_eattr = cpu_to_be64(0); 704 memset(&di->di_reserved, 0, sizeof(di->di_reserved)); 705 706 brelse(dibh); 707 } 708 709 static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, 710 unsigned int mode, const struct gfs2_inum_host *inum, 711 const u64 *generation) 712 { 713 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 714 unsigned int uid, gid; 715 int error; 716 717 munge_mode_uid_gid(dip, &mode, &uid, &gid); 718 gfs2_alloc_get(dip); 719 720 error = gfs2_quota_lock(dip, uid, gid); 721 if (error) 722 goto out; 723 724 error = gfs2_quota_check(dip, uid, gid); 725 if (error) 726 goto out_quota; 727 728 error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0); 729 if (error) 730 goto out_quota; 731 732 init_dinode(dip, gl, inum, mode, uid, gid, generation); 733 gfs2_quota_change(dip, +1, uid, gid); 734 gfs2_trans_end(sdp); 735 736 out_quota: 737 gfs2_quota_unlock(dip); 738 out: 739 gfs2_alloc_put(dip); 740 return error; 741 } 742 743 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, 744 struct gfs2_inode *ip) 745 { 746 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 747 struct gfs2_alloc *al; 748 int alloc_required; 749 struct buffer_head *dibh; 750 int error; 751 752 al = gfs2_alloc_get(dip); 753 754 error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); 755 if (error) 756 goto fail; 757 758 error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name); 759 if (alloc_required < 0) 760 goto fail; 761 if (alloc_required) { 762 error = gfs2_quota_check(dip, dip->i_di.di_uid, 763 dip->i_di.di_gid); 764 if (error) 765 goto fail_quota_locks; 766 767 al->al_requested = sdp->sd_max_dirres; 768 769 error = gfs2_inplace_reserve(dip); 770 if (error) 771 goto fail_quota_locks; 772 773 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + 774 al->al_rgd->rd_ri.ri_length + 775 2 * RES_DINODE + 776 RES_STATFS + RES_QUOTA, 0); 777 if (error) 778 goto fail_ipreserv; 779 } else { 780 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); 781 if (error) 782 goto fail_quota_locks; 783 } 784 785 error = gfs2_dir_add(&dip->i_inode, name, &ip->i_num, IF2DT(ip->i_di.di_mode)); 786 if (error) 787 goto fail_end_trans; 788 789 error = gfs2_meta_inode_buffer(ip, &dibh); 790 if (error) 791 goto fail_end_trans; 792 ip->i_di.di_nlink = 1; 793 gfs2_trans_add_bh(ip->i_gl, dibh, 1); 794 gfs2_dinode_out(&ip->i_di, dibh->b_data); 795 brelse(dibh); 796 return 0; 797 798 fail_end_trans: 799 gfs2_trans_end(sdp); 800 801 fail_ipreserv: 802 if (dip->i_alloc.al_rgd) 803 gfs2_inplace_release(dip); 804 805 fail_quota_locks: 806 gfs2_quota_unlock(dip); 807 808 fail: 809 gfs2_alloc_put(dip); 810 return error; 811 } 812 813 static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip) 814 { 815 int err; 816 size_t len; 817 void *value; 818 char *name; 819 struct gfs2_ea_request er; 820 821 err = security_inode_init_security(&ip->i_inode, &dip->i_inode, 822 &name, &value, &len); 823 824 if (err) { 825 if (err == -EOPNOTSUPP) 826 return 0; 827 return err; 828 } 829 830 memset(&er, 0, sizeof(struct gfs2_ea_request)); 831 832 er.er_type = GFS2_EATYPE_SECURITY; 833 er.er_name = name; 834 er.er_data = value; 835 er.er_name_len = strlen(name); 836 er.er_data_len = len; 837 838 err = gfs2_ea_set_i(ip, &er); 839 840 kfree(value); 841 kfree(name); 842 843 return err; 844 } 845 846 /** 847 * gfs2_createi - Create a new inode 848 * @ghs: An array of two holders 849 * @name: The name of the new file 850 * @mode: the permissions on the new inode 851 * 852 * @ghs[0] is an initialized holder for the directory 853 * @ghs[1] is the holder for the inode lock 854 * 855 * If the return value is not NULL, the glocks on both the directory and the new 856 * file are held. A transaction has been started and an inplace reservation 857 * is held, as well. 858 * 859 * Returns: An inode 860 */ 861 862 struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name, 863 unsigned int mode) 864 { 865 struct inode *inode; 866 struct gfs2_inode *dip = ghs->gh_gl->gl_object; 867 struct inode *dir = &dip->i_inode; 868 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 869 struct gfs2_inum_host inum; 870 int error; 871 u64 generation; 872 873 if (!name->len || name->len > GFS2_FNAMESIZE) 874 return ERR_PTR(-ENAMETOOLONG); 875 876 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs); 877 error = gfs2_glock_nq(ghs); 878 if (error) 879 goto fail; 880 881 error = create_ok(dip, name, mode); 882 if (error) 883 goto fail_gunlock; 884 885 error = pick_formal_ino(sdp, &inum.no_formal_ino); 886 if (error) 887 goto fail_gunlock; 888 889 error = alloc_dinode(dip, &inum, &generation); 890 if (error) 891 goto fail_gunlock; 892 893 if (inum.no_addr < dip->i_num.no_addr) { 894 gfs2_glock_dq(ghs); 895 896 error = gfs2_glock_nq_num(sdp, inum.no_addr, 897 &gfs2_inode_glops, LM_ST_EXCLUSIVE, 898 GL_SKIP, ghs + 1); 899 if (error) { 900 return ERR_PTR(error); 901 } 902 903 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs); 904 error = gfs2_glock_nq(ghs); 905 if (error) { 906 gfs2_glock_dq_uninit(ghs + 1); 907 return ERR_PTR(error); 908 } 909 910 error = create_ok(dip, name, mode); 911 if (error) 912 goto fail_gunlock2; 913 } else { 914 error = gfs2_glock_nq_num(sdp, inum.no_addr, 915 &gfs2_inode_glops, LM_ST_EXCLUSIVE, 916 GL_SKIP, ghs + 1); 917 if (error) 918 goto fail_gunlock; 919 } 920 921 error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation); 922 if (error) 923 goto fail_gunlock2; 924 925 inode = gfs2_inode_lookup(dir->i_sb, &inum, IF2DT(mode)); 926 if (IS_ERR(inode)) 927 goto fail_gunlock2; 928 929 error = gfs2_inode_refresh(GFS2_I(inode)); 930 if (error) 931 goto fail_iput; 932 933 error = gfs2_acl_create(dip, GFS2_I(inode)); 934 if (error) 935 goto fail_iput; 936 937 error = gfs2_security_init(dip, GFS2_I(inode)); 938 if (error) 939 goto fail_iput; 940 941 error = link_dinode(dip, name, GFS2_I(inode)); 942 if (error) 943 goto fail_iput; 944 945 if (!inode) 946 return ERR_PTR(-ENOMEM); 947 return inode; 948 949 fail_iput: 950 iput(inode); 951 fail_gunlock2: 952 gfs2_glock_dq_uninit(ghs + 1); 953 fail_gunlock: 954 gfs2_glock_dq(ghs); 955 fail: 956 return ERR_PTR(error); 957 } 958 959 /** 960 * gfs2_rmdiri - Remove a directory 961 * @dip: The parent directory of the directory to be removed 962 * @name: The name of the directory to be removed 963 * @ip: The GFS2 inode of the directory to be removed 964 * 965 * Assumes Glocks on dip and ip are held 966 * 967 * Returns: errno 968 */ 969 970 int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name, 971 struct gfs2_inode *ip) 972 { 973 struct qstr dotname; 974 int error; 975 976 if (ip->i_di.di_entries != 2) { 977 if (gfs2_consist_inode(ip)) 978 gfs2_dinode_print(&ip->i_di); 979 return -EIO; 980 } 981 982 error = gfs2_dir_del(dip, name); 983 if (error) 984 return error; 985 986 error = gfs2_change_nlink(dip, -1); 987 if (error) 988 return error; 989 990 gfs2_str2qstr(&dotname, "."); 991 error = gfs2_dir_del(ip, &dotname); 992 if (error) 993 return error; 994 995 gfs2_str2qstr(&dotname, ".."); 996 error = gfs2_dir_del(ip, &dotname); 997 if (error) 998 return error; 999 1000 error = gfs2_change_nlink(ip, -2); 1001 if (error) 1002 return error; 1003 1004 return error; 1005 } 1006 1007 /* 1008 * gfs2_unlink_ok - check to see that a inode is still in a directory 1009 * @dip: the directory 1010 * @name: the name of the file 1011 * @ip: the inode 1012 * 1013 * Assumes that the lock on (at least) @dip is held. 1014 * 1015 * Returns: 0 if the parent/child relationship is correct, errno if it isn't 1016 */ 1017 1018 int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, 1019 struct gfs2_inode *ip) 1020 { 1021 struct gfs2_inum_host inum; 1022 unsigned int type; 1023 int error; 1024 1025 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) 1026 return -EPERM; 1027 1028 if ((dip->i_di.di_mode & S_ISVTX) && 1029 dip->i_di.di_uid != current->fsuid && 1030 ip->i_di.di_uid != current->fsuid && !capable(CAP_FOWNER)) 1031 return -EPERM; 1032 1033 if (IS_APPEND(&dip->i_inode)) 1034 return -EPERM; 1035 1036 error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL); 1037 if (error) 1038 return error; 1039 1040 error = gfs2_dir_search(&dip->i_inode, name, &inum, &type); 1041 if (error) 1042 return error; 1043 1044 if (!gfs2_inum_equal(&inum, &ip->i_num)) 1045 return -ENOENT; 1046 1047 if (IF2DT(ip->i_di.di_mode) != type) { 1048 gfs2_consist_inode(dip); 1049 return -EIO; 1050 } 1051 1052 return 0; 1053 } 1054 1055 /* 1056 * gfs2_ok_to_move - check if it's ok to move a directory to another directory 1057 * @this: move this 1058 * @to: to here 1059 * 1060 * Follow @to back to the root and make sure we don't encounter @this 1061 * Assumes we already hold the rename lock. 1062 * 1063 * Returns: errno 1064 */ 1065 1066 int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) 1067 { 1068 struct inode *dir = &to->i_inode; 1069 struct super_block *sb = dir->i_sb; 1070 struct inode *tmp; 1071 struct qstr dotdot; 1072 int error = 0; 1073 1074 gfs2_str2qstr(&dotdot, ".."); 1075 1076 igrab(dir); 1077 1078 for (;;) { 1079 if (dir == &this->i_inode) { 1080 error = -EINVAL; 1081 break; 1082 } 1083 if (dir == sb->s_root->d_inode) { 1084 error = 0; 1085 break; 1086 } 1087 1088 tmp = gfs2_lookupi(dir, &dotdot, 1, NULL); 1089 if (IS_ERR(tmp)) { 1090 error = PTR_ERR(tmp); 1091 break; 1092 } 1093 1094 iput(dir); 1095 dir = tmp; 1096 } 1097 1098 iput(dir); 1099 1100 return error; 1101 } 1102 1103 /** 1104 * gfs2_readlinki - return the contents of a symlink 1105 * @ip: the symlink's inode 1106 * @buf: a pointer to the buffer to be filled 1107 * @len: a pointer to the length of @buf 1108 * 1109 * If @buf is too small, a piece of memory is kmalloc()ed and needs 1110 * to be freed by the caller. 1111 * 1112 * Returns: errno 1113 */ 1114 1115 int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len) 1116 { 1117 struct gfs2_holder i_gh; 1118 struct buffer_head *dibh; 1119 unsigned int x; 1120 int error; 1121 1122 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh); 1123 error = gfs2_glock_nq_atime(&i_gh); 1124 if (error) { 1125 gfs2_holder_uninit(&i_gh); 1126 return error; 1127 } 1128 1129 if (!ip->i_di.di_size) { 1130 gfs2_consist_inode(ip); 1131 error = -EIO; 1132 goto out; 1133 } 1134 1135 error = gfs2_meta_inode_buffer(ip, &dibh); 1136 if (error) 1137 goto out; 1138 1139 x = ip->i_di.di_size + 1; 1140 if (x > *len) { 1141 *buf = kmalloc(x, GFP_KERNEL); 1142 if (!*buf) { 1143 error = -ENOMEM; 1144 goto out_brelse; 1145 } 1146 } 1147 1148 memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x); 1149 *len = x; 1150 1151 out_brelse: 1152 brelse(dibh); 1153 out: 1154 gfs2_glock_dq_uninit(&i_gh); 1155 return error; 1156 } 1157 1158 /** 1159 * gfs2_glock_nq_atime - Acquire a hold on an inode's glock, and 1160 * conditionally update the inode's atime 1161 * @gh: the holder to acquire 1162 * 1163 * Tests atime (access time) for gfs2_read, gfs2_readdir and gfs2_mmap 1164 * Update if the difference between the current time and the inode's current 1165 * atime is greater than an interval specified at mount. 1166 * 1167 * Returns: errno 1168 */ 1169 1170 int gfs2_glock_nq_atime(struct gfs2_holder *gh) 1171 { 1172 struct gfs2_glock *gl = gh->gh_gl; 1173 struct gfs2_sbd *sdp = gl->gl_sbd; 1174 struct gfs2_inode *ip = gl->gl_object; 1175 s64 curtime, quantum = gfs2_tune_get(sdp, gt_atime_quantum); 1176 unsigned int state; 1177 int flags; 1178 int error; 1179 1180 if (gfs2_assert_warn(sdp, gh->gh_flags & GL_ATIME) || 1181 gfs2_assert_warn(sdp, !(gh->gh_flags & GL_ASYNC)) || 1182 gfs2_assert_warn(sdp, gl->gl_ops == &gfs2_inode_glops)) 1183 return -EINVAL; 1184 1185 state = gh->gh_state; 1186 flags = gh->gh_flags; 1187 1188 error = gfs2_glock_nq(gh); 1189 if (error) 1190 return error; 1191 1192 if (test_bit(SDF_NOATIME, &sdp->sd_flags) || 1193 (sdp->sd_vfs->s_flags & MS_RDONLY)) 1194 return 0; 1195 1196 curtime = get_seconds(); 1197 if (curtime - ip->i_di.di_atime >= quantum) { 1198 gfs2_glock_dq(gh); 1199 gfs2_holder_reinit(LM_ST_EXCLUSIVE, gh->gh_flags & ~LM_FLAG_ANY, 1200 gh); 1201 error = gfs2_glock_nq(gh); 1202 if (error) 1203 return error; 1204 1205 /* Verify that atime hasn't been updated while we were 1206 trying to get exclusive lock. */ 1207 1208 curtime = get_seconds(); 1209 if (curtime - ip->i_di.di_atime >= quantum) { 1210 struct buffer_head *dibh; 1211 struct gfs2_dinode *di; 1212 1213 error = gfs2_trans_begin(sdp, RES_DINODE, 0); 1214 if (error == -EROFS) 1215 return 0; 1216 if (error) 1217 goto fail; 1218 1219 error = gfs2_meta_inode_buffer(ip, &dibh); 1220 if (error) 1221 goto fail_end_trans; 1222 1223 ip->i_di.di_atime = curtime; 1224 1225 gfs2_trans_add_bh(ip->i_gl, dibh, 1); 1226 di = (struct gfs2_dinode *)dibh->b_data; 1227 di->di_atime = cpu_to_be64(ip->i_di.di_atime); 1228 brelse(dibh); 1229 1230 gfs2_trans_end(sdp); 1231 } 1232 1233 /* If someone else has asked for the glock, 1234 unlock and let them have it. Then reacquire 1235 in the original state. */ 1236 if (gfs2_glock_is_blocking(gl)) { 1237 gfs2_glock_dq(gh); 1238 gfs2_holder_reinit(state, flags, gh); 1239 return gfs2_glock_nq(gh); 1240 } 1241 } 1242 1243 return 0; 1244 1245 fail_end_trans: 1246 gfs2_trans_end(sdp); 1247 fail: 1248 gfs2_glock_dq(gh); 1249 return error; 1250 } 1251 1252 /** 1253 * glock_compare_atime - Compare two struct gfs2_glock structures for sort 1254 * @arg_a: the first structure 1255 * @arg_b: the second structure 1256 * 1257 * Returns: 1 if A > B 1258 * -1 if A < B 1259 * 0 if A == B 1260 */ 1261 1262 static int glock_compare_atime(const void *arg_a, const void *arg_b) 1263 { 1264 const struct gfs2_holder *gh_a = *(const struct gfs2_holder **)arg_a; 1265 const struct gfs2_holder *gh_b = *(const struct gfs2_holder **)arg_b; 1266 const struct lm_lockname *a = &gh_a->gh_gl->gl_name; 1267 const struct lm_lockname *b = &gh_b->gh_gl->gl_name; 1268 1269 if (a->ln_number > b->ln_number) 1270 return 1; 1271 if (a->ln_number < b->ln_number) 1272 return -1; 1273 if (gh_a->gh_state == LM_ST_SHARED && gh_b->gh_state == LM_ST_EXCLUSIVE) 1274 return 1; 1275 if (gh_a->gh_state == LM_ST_SHARED && (gh_b->gh_flags & GL_ATIME)) 1276 return 1; 1277 1278 return 0; 1279 } 1280 1281 /** 1282 * gfs2_glock_nq_m_atime - acquire multiple glocks where one may need an 1283 * atime update 1284 * @num_gh: the number of structures 1285 * @ghs: an array of struct gfs2_holder structures 1286 * 1287 * Returns: 0 on success (all glocks acquired), 1288 * errno on failure (no glocks acquired) 1289 */ 1290 1291 int gfs2_glock_nq_m_atime(unsigned int num_gh, struct gfs2_holder *ghs) 1292 { 1293 struct gfs2_holder **p; 1294 unsigned int x; 1295 int error = 0; 1296 1297 if (!num_gh) 1298 return 0; 1299 1300 if (num_gh == 1) { 1301 ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); 1302 if (ghs->gh_flags & GL_ATIME) 1303 error = gfs2_glock_nq_atime(ghs); 1304 else 1305 error = gfs2_glock_nq(ghs); 1306 return error; 1307 } 1308 1309 p = kcalloc(num_gh, sizeof(struct gfs2_holder *), GFP_KERNEL); 1310 if (!p) 1311 return -ENOMEM; 1312 1313 for (x = 0; x < num_gh; x++) 1314 p[x] = &ghs[x]; 1315 1316 sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare_atime,NULL); 1317 1318 for (x = 0; x < num_gh; x++) { 1319 p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); 1320 1321 if (p[x]->gh_flags & GL_ATIME) 1322 error = gfs2_glock_nq_atime(p[x]); 1323 else 1324 error = gfs2_glock_nq(p[x]); 1325 1326 if (error) { 1327 while (x--) 1328 gfs2_glock_dq(p[x]); 1329 break; 1330 } 1331 } 1332 1333 kfree(p); 1334 return error; 1335 } 1336 1337 1338 static int 1339 __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr) 1340 { 1341 struct buffer_head *dibh; 1342 int error; 1343 1344 error = gfs2_meta_inode_buffer(ip, &dibh); 1345 if (!error) { 1346 error = inode_setattr(&ip->i_inode, attr); 1347 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error); 1348 gfs2_inode_attr_out(ip); 1349 1350 gfs2_trans_add_bh(ip->i_gl, dibh, 1); 1351 gfs2_dinode_out(&ip->i_di, dibh->b_data); 1352 brelse(dibh); 1353 } 1354 return error; 1355 } 1356 1357 /** 1358 * gfs2_setattr_simple - 1359 * @ip: 1360 * @attr: 1361 * 1362 * Called with a reference on the vnode. 1363 * 1364 * Returns: errno 1365 */ 1366 1367 int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr) 1368 { 1369 int error; 1370 1371 if (current->journal_info) 1372 return __gfs2_setattr_simple(ip, attr); 1373 1374 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0); 1375 if (error) 1376 return error; 1377 1378 error = __gfs2_setattr_simple(ip, attr); 1379 gfs2_trans_end(GFS2_SB(&ip->i_inode)); 1380 return error; 1381 } 1382 1383