1 /* 2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 3 * Copyright (C) 2004-2008 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/security.h> 20 #include <linux/time.h> 21 22 #include "gfs2.h" 23 #include "incore.h" 24 #include "acl.h" 25 #include "bmap.h" 26 #include "dir.h" 27 #include "xattr.h" 28 #include "glock.h" 29 #include "glops.h" 30 #include "inode.h" 31 #include "log.h" 32 #include "meta_io.h" 33 #include "quota.h" 34 #include "rgrp.h" 35 #include "trans.h" 36 #include "util.h" 37 38 struct gfs2_inum_range_host { 39 u64 ir_start; 40 u64 ir_length; 41 }; 42 43 static int iget_test(struct inode *inode, void *opaque) 44 { 45 struct gfs2_inode *ip = GFS2_I(inode); 46 u64 *no_addr = opaque; 47 48 if (ip->i_no_addr == *no_addr && test_bit(GIF_USER, &ip->i_flags)) 49 return 1; 50 51 return 0; 52 } 53 54 static int iget_set(struct inode *inode, void *opaque) 55 { 56 struct gfs2_inode *ip = GFS2_I(inode); 57 u64 *no_addr = opaque; 58 59 inode->i_ino = (unsigned long)*no_addr; 60 ip->i_no_addr = *no_addr; 61 set_bit(GIF_USER, &ip->i_flags); 62 return 0; 63 } 64 65 struct inode *gfs2_ilookup(struct super_block *sb, u64 no_addr) 66 { 67 unsigned long hash = (unsigned long)no_addr; 68 return ilookup5(sb, hash, iget_test, &no_addr); 69 } 70 71 static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr) 72 { 73 unsigned long hash = (unsigned long)no_addr; 74 return iget5_locked(sb, hash, iget_test, iget_set, &no_addr); 75 } 76 77 struct gfs2_skip_data { 78 u64 no_addr; 79 int skipped; 80 }; 81 82 static int iget_skip_test(struct inode *inode, void *opaque) 83 { 84 struct gfs2_inode *ip = GFS2_I(inode); 85 struct gfs2_skip_data *data = opaque; 86 87 if (ip->i_no_addr == data->no_addr && test_bit(GIF_USER, &ip->i_flags)){ 88 if (inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE)){ 89 data->skipped = 1; 90 return 0; 91 } 92 return 1; 93 } 94 return 0; 95 } 96 97 static int iget_skip_set(struct inode *inode, void *opaque) 98 { 99 struct gfs2_inode *ip = GFS2_I(inode); 100 struct gfs2_skip_data *data = opaque; 101 102 if (data->skipped) 103 return 1; 104 inode->i_ino = (unsigned long)(data->no_addr); 105 ip->i_no_addr = data->no_addr; 106 set_bit(GIF_USER, &ip->i_flags); 107 return 0; 108 } 109 110 static struct inode *gfs2_iget_skip(struct super_block *sb, 111 u64 no_addr) 112 { 113 struct gfs2_skip_data data; 114 unsigned long hash = (unsigned long)no_addr; 115 116 data.no_addr = no_addr; 117 data.skipped = 0; 118 return iget5_locked(sb, hash, iget_skip_test, iget_skip_set, &data); 119 } 120 121 /** 122 * GFS2 lookup code fills in vfs inode contents based on info obtained 123 * from directory entry inside gfs2_inode_lookup(). This has caused issues 124 * with NFS code path since its get_dentry routine doesn't have the relevant 125 * directory entry when gfs2_inode_lookup() is invoked. Part of the code 126 * segment inside gfs2_inode_lookup code needs to get moved around. 127 * 128 * Clears I_NEW as well. 129 **/ 130 131 void gfs2_set_iop(struct inode *inode) 132 { 133 struct gfs2_sbd *sdp = GFS2_SB(inode); 134 umode_t mode = inode->i_mode; 135 136 if (S_ISREG(mode)) { 137 inode->i_op = &gfs2_file_iops; 138 if (gfs2_localflocks(sdp)) 139 inode->i_fop = &gfs2_file_fops_nolock; 140 else 141 inode->i_fop = &gfs2_file_fops; 142 } else if (S_ISDIR(mode)) { 143 inode->i_op = &gfs2_dir_iops; 144 if (gfs2_localflocks(sdp)) 145 inode->i_fop = &gfs2_dir_fops_nolock; 146 else 147 inode->i_fop = &gfs2_dir_fops; 148 } else if (S_ISLNK(mode)) { 149 inode->i_op = &gfs2_symlink_iops; 150 } else { 151 inode->i_op = &gfs2_file_iops; 152 init_special_inode(inode, inode->i_mode, inode->i_rdev); 153 } 154 155 unlock_new_inode(inode); 156 } 157 158 /** 159 * gfs2_inode_lookup - Lookup an inode 160 * @sb: The super block 161 * @no_addr: The inode number 162 * @type: The type of the inode 163 * @skip_freeing: set this not return an inode if it is currently being freed. 164 * 165 * Returns: A VFS inode, or an error 166 */ 167 168 struct inode *gfs2_inode_lookup(struct super_block *sb, 169 unsigned int type, 170 u64 no_addr, 171 u64 no_formal_ino, int skip_freeing) 172 { 173 struct inode *inode; 174 struct gfs2_inode *ip; 175 struct gfs2_glock *io_gl; 176 int error; 177 178 if (skip_freeing) 179 inode = gfs2_iget_skip(sb, no_addr); 180 else 181 inode = gfs2_iget(sb, no_addr); 182 ip = GFS2_I(inode); 183 184 if (!inode) 185 return ERR_PTR(-ENOBUFS); 186 187 if (inode->i_state & I_NEW) { 188 struct gfs2_sbd *sdp = GFS2_SB(inode); 189 ip->i_no_formal_ino = no_formal_ino; 190 191 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); 192 if (unlikely(error)) 193 goto fail; 194 ip->i_gl->gl_object = ip; 195 196 error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl); 197 if (unlikely(error)) 198 goto fail_put; 199 200 set_bit(GIF_INVALID, &ip->i_flags); 201 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); 202 if (unlikely(error)) 203 goto fail_iopen; 204 ip->i_iopen_gh.gh_gl->gl_object = ip; 205 206 gfs2_glock_put(io_gl); 207 208 if ((type == DT_UNKNOWN) && (no_formal_ino == 0)) 209 goto gfs2_nfsbypass; 210 211 inode->i_mode = DT2IF(type); 212 213 /* 214 * We must read the inode in order to work out its type in 215 * this case. Note that this doesn't happen often as we normally 216 * know the type beforehand. This code path only occurs during 217 * unlinked inode recovery (where it is safe to do this glock, 218 * which is not true in the general case). 219 */ 220 if (type == DT_UNKNOWN) { 221 struct gfs2_holder gh; 222 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 223 if (unlikely(error)) 224 goto fail_glock; 225 /* Inode is now uptodate */ 226 gfs2_glock_dq_uninit(&gh); 227 } 228 229 gfs2_set_iop(inode); 230 } 231 232 gfs2_nfsbypass: 233 return inode; 234 fail_glock: 235 gfs2_glock_dq(&ip->i_iopen_gh); 236 fail_iopen: 237 gfs2_glock_put(io_gl); 238 fail_put: 239 ip->i_gl->gl_object = NULL; 240 gfs2_glock_put(ip->i_gl); 241 fail: 242 iget_failed(inode); 243 return ERR_PTR(error); 244 } 245 246 static int gfs2_dinode_in(struct gfs2_inode *ip, const void *buf) 247 { 248 const struct gfs2_dinode *str = buf; 249 struct timespec atime; 250 u16 height, depth; 251 252 if (unlikely(ip->i_no_addr != be64_to_cpu(str->di_num.no_addr))) 253 goto corrupt; 254 ip->i_no_formal_ino = be64_to_cpu(str->di_num.no_formal_ino); 255 ip->i_inode.i_mode = be32_to_cpu(str->di_mode); 256 ip->i_inode.i_rdev = 0; 257 switch (ip->i_inode.i_mode & S_IFMT) { 258 case S_IFBLK: 259 case S_IFCHR: 260 ip->i_inode.i_rdev = MKDEV(be32_to_cpu(str->di_major), 261 be32_to_cpu(str->di_minor)); 262 break; 263 }; 264 265 ip->i_inode.i_uid = be32_to_cpu(str->di_uid); 266 ip->i_inode.i_gid = be32_to_cpu(str->di_gid); 267 /* 268 * We will need to review setting the nlink count here in the 269 * light of the forthcoming ro bind mount work. This is a reminder 270 * to do that. 271 */ 272 ip->i_inode.i_nlink = be32_to_cpu(str->di_nlink); 273 ip->i_disksize = be64_to_cpu(str->di_size); 274 i_size_write(&ip->i_inode, ip->i_disksize); 275 gfs2_set_inode_blocks(&ip->i_inode, be64_to_cpu(str->di_blocks)); 276 atime.tv_sec = be64_to_cpu(str->di_atime); 277 atime.tv_nsec = be32_to_cpu(str->di_atime_nsec); 278 if (timespec_compare(&ip->i_inode.i_atime, &atime) < 0) 279 ip->i_inode.i_atime = atime; 280 ip->i_inode.i_mtime.tv_sec = be64_to_cpu(str->di_mtime); 281 ip->i_inode.i_mtime.tv_nsec = be32_to_cpu(str->di_mtime_nsec); 282 ip->i_inode.i_ctime.tv_sec = be64_to_cpu(str->di_ctime); 283 ip->i_inode.i_ctime.tv_nsec = be32_to_cpu(str->di_ctime_nsec); 284 285 ip->i_goal = be64_to_cpu(str->di_goal_meta); 286 ip->i_generation = be64_to_cpu(str->di_generation); 287 288 ip->i_diskflags = be32_to_cpu(str->di_flags); 289 gfs2_set_inode_flags(&ip->i_inode); 290 height = be16_to_cpu(str->di_height); 291 if (unlikely(height > GFS2_MAX_META_HEIGHT)) 292 goto corrupt; 293 ip->i_height = (u8)height; 294 295 depth = be16_to_cpu(str->di_depth); 296 if (unlikely(depth > GFS2_DIR_MAX_DEPTH)) 297 goto corrupt; 298 ip->i_depth = (u8)depth; 299 ip->i_entries = be32_to_cpu(str->di_entries); 300 301 ip->i_eattr = be64_to_cpu(str->di_eattr); 302 if (S_ISREG(ip->i_inode.i_mode)) 303 gfs2_set_aops(&ip->i_inode); 304 305 return 0; 306 corrupt: 307 if (gfs2_consist_inode(ip)) 308 gfs2_dinode_print(ip); 309 return -EIO; 310 } 311 312 /** 313 * gfs2_inode_refresh - Refresh the incore copy of the dinode 314 * @ip: The GFS2 inode 315 * 316 * Returns: errno 317 */ 318 319 int gfs2_inode_refresh(struct gfs2_inode *ip) 320 { 321 struct buffer_head *dibh; 322 int error; 323 324 error = gfs2_meta_inode_buffer(ip, &dibh); 325 if (error) 326 return error; 327 328 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), dibh, GFS2_METATYPE_DI)) { 329 brelse(dibh); 330 return -EIO; 331 } 332 333 error = gfs2_dinode_in(ip, dibh->b_data); 334 brelse(dibh); 335 clear_bit(GIF_INVALID, &ip->i_flags); 336 337 return error; 338 } 339 340 int gfs2_dinode_dealloc(struct gfs2_inode *ip) 341 { 342 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 343 struct gfs2_alloc *al; 344 struct gfs2_rgrpd *rgd; 345 int error; 346 347 if (gfs2_get_inode_blocks(&ip->i_inode) != 1) { 348 if (gfs2_consist_inode(ip)) 349 gfs2_dinode_print(ip); 350 return -EIO; 351 } 352 353 al = gfs2_alloc_get(ip); 354 if (!al) 355 return -ENOMEM; 356 357 error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); 358 if (error) 359 goto out; 360 361 error = gfs2_rindex_hold(sdp, &al->al_ri_gh); 362 if (error) 363 goto out_qs; 364 365 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr); 366 if (!rgd) { 367 gfs2_consist_inode(ip); 368 error = -EIO; 369 goto out_rindex_relse; 370 } 371 372 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, 373 &al->al_rgd_gh); 374 if (error) 375 goto out_rindex_relse; 376 377 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 1); 378 if (error) 379 goto out_rg_gunlock; 380 381 set_bit(GLF_DIRTY, &ip->i_gl->gl_flags); 382 set_bit(GLF_LFLUSH, &ip->i_gl->gl_flags); 383 384 gfs2_free_di(rgd, ip); 385 386 gfs2_trans_end(sdp); 387 388 out_rg_gunlock: 389 gfs2_glock_dq_uninit(&al->al_rgd_gh); 390 out_rindex_relse: 391 gfs2_glock_dq_uninit(&al->al_ri_gh); 392 out_qs: 393 gfs2_quota_unhold(ip); 394 out: 395 gfs2_alloc_put(ip); 396 return error; 397 } 398 399 /** 400 * gfs2_change_nlink - Change nlink count on inode 401 * @ip: The GFS2 inode 402 * @diff: The change in the nlink count required 403 * 404 * Returns: errno 405 */ 406 int gfs2_change_nlink(struct gfs2_inode *ip, int diff) 407 { 408 struct buffer_head *dibh; 409 u32 nlink; 410 int error; 411 412 BUG_ON(diff != 1 && diff != -1); 413 nlink = ip->i_inode.i_nlink + diff; 414 415 /* If we are reducing the nlink count, but the new value ends up being 416 bigger than the old one, we must have underflowed. */ 417 if (diff < 0 && nlink > ip->i_inode.i_nlink) { 418 if (gfs2_consist_inode(ip)) 419 gfs2_dinode_print(ip); 420 return -EIO; 421 } 422 423 error = gfs2_meta_inode_buffer(ip, &dibh); 424 if (error) 425 return error; 426 427 if (diff > 0) 428 inc_nlink(&ip->i_inode); 429 else 430 drop_nlink(&ip->i_inode); 431 432 ip->i_inode.i_ctime = CURRENT_TIME; 433 434 gfs2_trans_add_bh(ip->i_gl, dibh, 1); 435 gfs2_dinode_out(ip, dibh->b_data); 436 brelse(dibh); 437 mark_inode_dirty(&ip->i_inode); 438 439 if (ip->i_inode.i_nlink == 0) 440 gfs2_unlink_di(&ip->i_inode); /* mark inode unlinked */ 441 442 return error; 443 } 444 445 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name) 446 { 447 struct qstr qstr; 448 struct inode *inode; 449 gfs2_str2qstr(&qstr, name); 450 inode = gfs2_lookupi(dip, &qstr, 1); 451 /* gfs2_lookupi has inconsistent callers: vfs 452 * related routines expect NULL for no entry found, 453 * gfs2_lookup_simple callers expect ENOENT 454 * and do not check for NULL. 455 */ 456 if (inode == NULL) 457 return ERR_PTR(-ENOENT); 458 else 459 return inode; 460 } 461 462 463 /** 464 * gfs2_lookupi - Look up a filename in a directory and return its inode 465 * @d_gh: An initialized holder for the directory glock 466 * @name: The name of the inode to look for 467 * @is_root: If 1, ignore the caller's permissions 468 * @i_gh: An uninitialized holder for the new inode glock 469 * 470 * This can be called via the VFS filldir function when NFS is doing 471 * a readdirplus and the inode which its intending to stat isn't 472 * already in cache. In this case we must not take the directory glock 473 * again, since the readdir call will have already taken that lock. 474 * 475 * Returns: errno 476 */ 477 478 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name, 479 int is_root) 480 { 481 struct super_block *sb = dir->i_sb; 482 struct gfs2_inode *dip = GFS2_I(dir); 483 struct gfs2_holder d_gh; 484 int error = 0; 485 struct inode *inode = NULL; 486 int unlock = 0; 487 488 if (!name->len || name->len > GFS2_FNAMESIZE) 489 return ERR_PTR(-ENAMETOOLONG); 490 491 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) || 492 (name->len == 2 && memcmp(name->name, "..", 2) == 0 && 493 dir == sb->s_root->d_inode)) { 494 igrab(dir); 495 return dir; 496 } 497 498 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) { 499 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); 500 if (error) 501 return ERR_PTR(error); 502 unlock = 1; 503 } 504 505 if (!is_root) { 506 error = gfs2_permission(dir, MAY_EXEC); 507 if (error) 508 goto out; 509 } 510 511 inode = gfs2_dir_search(dir, name); 512 if (IS_ERR(inode)) 513 error = PTR_ERR(inode); 514 out: 515 if (unlock) 516 gfs2_glock_dq_uninit(&d_gh); 517 if (error == -ENOENT) 518 return NULL; 519 return inode ? inode : ERR_PTR(error); 520 } 521 522 /** 523 * create_ok - OK to create a new on-disk inode here? 524 * @dip: Directory in which dinode is to be created 525 * @name: Name of new dinode 526 * @mode: 527 * 528 * Returns: errno 529 */ 530 531 static int create_ok(struct gfs2_inode *dip, const struct qstr *name, 532 unsigned int mode) 533 { 534 int error; 535 536 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC); 537 if (error) 538 return error; 539 540 /* Don't create entries in an unlinked directory */ 541 if (!dip->i_inode.i_nlink) 542 return -EPERM; 543 544 error = gfs2_dir_check(&dip->i_inode, name, NULL); 545 switch (error) { 546 case -ENOENT: 547 error = 0; 548 break; 549 case 0: 550 return -EEXIST; 551 default: 552 return error; 553 } 554 555 if (dip->i_entries == (u32)-1) 556 return -EFBIG; 557 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1) 558 return -EMLINK; 559 560 return 0; 561 } 562 563 static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode, 564 unsigned int *uid, unsigned int *gid) 565 { 566 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir && 567 (dip->i_inode.i_mode & S_ISUID) && dip->i_inode.i_uid) { 568 if (S_ISDIR(*mode)) 569 *mode |= S_ISUID; 570 else if (dip->i_inode.i_uid != current_fsuid()) 571 *mode &= ~07111; 572 *uid = dip->i_inode.i_uid; 573 } else 574 *uid = current_fsuid(); 575 576 if (dip->i_inode.i_mode & S_ISGID) { 577 if (S_ISDIR(*mode)) 578 *mode |= S_ISGID; 579 *gid = dip->i_inode.i_gid; 580 } else 581 *gid = current_fsgid(); 582 } 583 584 static int alloc_dinode(struct gfs2_inode *dip, u64 *no_addr, u64 *generation) 585 { 586 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 587 int error; 588 589 if (gfs2_alloc_get(dip) == NULL) 590 return -ENOMEM; 591 592 dip->i_alloc->al_requested = RES_DINODE; 593 error = gfs2_inplace_reserve(dip); 594 if (error) 595 goto out; 596 597 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0); 598 if (error) 599 goto out_ipreserv; 600 601 error = gfs2_alloc_di(dip, no_addr, generation); 602 603 gfs2_trans_end(sdp); 604 605 out_ipreserv: 606 gfs2_inplace_release(dip); 607 out: 608 gfs2_alloc_put(dip); 609 return error; 610 } 611 612 /** 613 * init_dinode - Fill in a new dinode structure 614 * @dip: the directory this inode is being created in 615 * @gl: The glock covering the new inode 616 * @inum: the inode number 617 * @mode: the file permissions 618 * @uid: 619 * @gid: 620 * 621 */ 622 623 static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, 624 const struct gfs2_inum_host *inum, unsigned int mode, 625 unsigned int uid, unsigned int gid, 626 const u64 *generation, dev_t dev, struct buffer_head **bhp) 627 { 628 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 629 struct gfs2_dinode *di; 630 struct buffer_head *dibh; 631 struct timespec tv = CURRENT_TIME; 632 633 dibh = gfs2_meta_new(gl, inum->no_addr); 634 gfs2_trans_add_bh(gl, dibh, 1); 635 gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI); 636 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); 637 di = (struct gfs2_dinode *)dibh->b_data; 638 639 di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino); 640 di->di_num.no_addr = cpu_to_be64(inum->no_addr); 641 di->di_mode = cpu_to_be32(mode); 642 di->di_uid = cpu_to_be32(uid); 643 di->di_gid = cpu_to_be32(gid); 644 di->di_nlink = 0; 645 di->di_size = 0; 646 di->di_blocks = cpu_to_be64(1); 647 di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(tv.tv_sec); 648 di->di_major = cpu_to_be32(MAJOR(dev)); 649 di->di_minor = cpu_to_be32(MINOR(dev)); 650 di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr); 651 di->di_generation = cpu_to_be64(*generation); 652 di->di_flags = 0; 653 654 if (S_ISREG(mode)) { 655 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) || 656 gfs2_tune_get(sdp, gt_new_files_jdata)) 657 di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA); 658 } else if (S_ISDIR(mode)) { 659 di->di_flags |= cpu_to_be32(dip->i_diskflags & 660 GFS2_DIF_INHERIT_JDATA); 661 } 662 663 di->__pad1 = 0; 664 di->di_payload_format = cpu_to_be32(S_ISDIR(mode) ? GFS2_FORMAT_DE : 0); 665 di->di_height = 0; 666 di->__pad2 = 0; 667 di->__pad3 = 0; 668 di->di_depth = 0; 669 di->di_entries = 0; 670 memset(&di->__pad4, 0, sizeof(di->__pad4)); 671 di->di_eattr = 0; 672 di->di_atime_nsec = cpu_to_be32(tv.tv_nsec); 673 di->di_mtime_nsec = cpu_to_be32(tv.tv_nsec); 674 di->di_ctime_nsec = cpu_to_be32(tv.tv_nsec); 675 memset(&di->di_reserved, 0, sizeof(di->di_reserved)); 676 677 set_buffer_uptodate(dibh); 678 679 *bhp = dibh; 680 } 681 682 static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, 683 unsigned int mode, const struct gfs2_inum_host *inum, 684 const u64 *generation, dev_t dev, struct buffer_head **bhp) 685 { 686 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 687 unsigned int uid, gid; 688 int error; 689 690 munge_mode_uid_gid(dip, &mode, &uid, &gid); 691 if (!gfs2_alloc_get(dip)) 692 return -ENOMEM; 693 694 error = gfs2_quota_lock(dip, uid, gid); 695 if (error) 696 goto out; 697 698 error = gfs2_quota_check(dip, uid, gid); 699 if (error) 700 goto out_quota; 701 702 error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0); 703 if (error) 704 goto out_quota; 705 706 init_dinode(dip, gl, inum, mode, uid, gid, generation, dev, bhp); 707 gfs2_quota_change(dip, +1, uid, gid); 708 gfs2_trans_end(sdp); 709 710 out_quota: 711 gfs2_quota_unlock(dip); 712 out: 713 gfs2_alloc_put(dip); 714 return error; 715 } 716 717 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, 718 struct gfs2_inode *ip) 719 { 720 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 721 struct gfs2_alloc *al; 722 int alloc_required; 723 struct buffer_head *dibh; 724 int error; 725 726 al = gfs2_alloc_get(dip); 727 if (!al) 728 return -ENOMEM; 729 730 error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); 731 if (error) 732 goto fail; 733 734 error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name); 735 if (alloc_required < 0) 736 goto fail_quota_locks; 737 if (alloc_required) { 738 error = gfs2_quota_check(dip, dip->i_inode.i_uid, dip->i_inode.i_gid); 739 if (error) 740 goto fail_quota_locks; 741 742 al->al_requested = sdp->sd_max_dirres; 743 744 error = gfs2_inplace_reserve(dip); 745 if (error) 746 goto fail_quota_locks; 747 748 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + 749 al->al_rgd->rd_length + 750 2 * RES_DINODE + 751 RES_STATFS + RES_QUOTA, 0); 752 if (error) 753 goto fail_ipreserv; 754 } else { 755 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); 756 if (error) 757 goto fail_quota_locks; 758 } 759 760 error = gfs2_dir_add(&dip->i_inode, name, ip, IF2DT(ip->i_inode.i_mode)); 761 if (error) 762 goto fail_end_trans; 763 764 error = gfs2_meta_inode_buffer(ip, &dibh); 765 if (error) 766 goto fail_end_trans; 767 ip->i_inode.i_nlink = 1; 768 gfs2_trans_add_bh(ip->i_gl, dibh, 1); 769 gfs2_dinode_out(ip, dibh->b_data); 770 brelse(dibh); 771 return 0; 772 773 fail_end_trans: 774 gfs2_trans_end(sdp); 775 776 fail_ipreserv: 777 if (dip->i_alloc->al_rgd) 778 gfs2_inplace_release(dip); 779 780 fail_quota_locks: 781 gfs2_quota_unlock(dip); 782 783 fail: 784 gfs2_alloc_put(dip); 785 return error; 786 } 787 788 static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip) 789 { 790 int err; 791 size_t len; 792 void *value; 793 char *name; 794 795 err = security_inode_init_security(&ip->i_inode, &dip->i_inode, 796 &name, &value, &len); 797 798 if (err) { 799 if (err == -EOPNOTSUPP) 800 return 0; 801 return err; 802 } 803 804 err = __gfs2_xattr_set(&ip->i_inode, name, value, len, 0, 805 GFS2_EATYPE_SECURITY); 806 kfree(value); 807 kfree(name); 808 809 return err; 810 } 811 812 /** 813 * gfs2_createi - Create a new inode 814 * @ghs: An array of two holders 815 * @name: The name of the new file 816 * @mode: the permissions on the new inode 817 * 818 * @ghs[0] is an initialized holder for the directory 819 * @ghs[1] is the holder for the inode lock 820 * 821 * If the return value is not NULL, the glocks on both the directory and the new 822 * file are held. A transaction has been started and an inplace reservation 823 * is held, as well. 824 * 825 * Returns: An inode 826 */ 827 828 struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name, 829 unsigned int mode, dev_t dev) 830 { 831 struct inode *inode = NULL; 832 struct gfs2_inode *dip = ghs->gh_gl->gl_object; 833 struct inode *dir = &dip->i_inode; 834 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 835 struct gfs2_inum_host inum = { .no_addr = 0, .no_formal_ino = 0 }; 836 int error; 837 u64 generation; 838 struct buffer_head *bh = NULL; 839 840 if (!name->len || name->len > GFS2_FNAMESIZE) 841 return ERR_PTR(-ENAMETOOLONG); 842 843 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs); 844 error = gfs2_glock_nq(ghs); 845 if (error) 846 goto fail; 847 848 error = create_ok(dip, name, mode); 849 if (error) 850 goto fail_gunlock; 851 852 error = alloc_dinode(dip, &inum.no_addr, &generation); 853 if (error) 854 goto fail_gunlock; 855 inum.no_formal_ino = generation; 856 857 error = gfs2_glock_nq_num(sdp, inum.no_addr, &gfs2_inode_glops, 858 LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1); 859 if (error) 860 goto fail_gunlock; 861 862 error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation, dev, &bh); 863 if (error) 864 goto fail_gunlock2; 865 866 inode = gfs2_inode_lookup(dir->i_sb, IF2DT(mode), inum.no_addr, 867 inum.no_formal_ino, 0); 868 if (IS_ERR(inode)) 869 goto fail_gunlock2; 870 871 error = gfs2_inode_refresh(GFS2_I(inode)); 872 if (error) 873 goto fail_gunlock2; 874 875 error = gfs2_acl_create(dip, inode); 876 if (error) 877 goto fail_gunlock2; 878 879 error = gfs2_security_init(dip, GFS2_I(inode)); 880 if (error) 881 goto fail_gunlock2; 882 883 error = link_dinode(dip, name, GFS2_I(inode)); 884 if (error) 885 goto fail_gunlock2; 886 887 if (bh) 888 brelse(bh); 889 return inode; 890 891 fail_gunlock2: 892 gfs2_glock_dq_uninit(ghs + 1); 893 if (inode && !IS_ERR(inode)) 894 iput(inode); 895 fail_gunlock: 896 gfs2_glock_dq(ghs); 897 fail: 898 if (bh) 899 brelse(bh); 900 return ERR_PTR(error); 901 } 902 903 static int __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr) 904 { 905 struct buffer_head *dibh; 906 int error; 907 908 error = gfs2_meta_inode_buffer(ip, &dibh); 909 if (!error) { 910 error = inode_setattr(&ip->i_inode, attr); 911 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error); 912 gfs2_trans_add_bh(ip->i_gl, dibh, 1); 913 gfs2_dinode_out(ip, dibh->b_data); 914 brelse(dibh); 915 } 916 return error; 917 } 918 919 /** 920 * gfs2_setattr_simple - 921 * @ip: 922 * @attr: 923 * 924 * Called with a reference on the vnode. 925 * 926 * Returns: errno 927 */ 928 929 int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr) 930 { 931 int error; 932 933 if (current->journal_info) 934 return __gfs2_setattr_simple(ip, attr); 935 936 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0); 937 if (error) 938 return error; 939 940 error = __gfs2_setattr_simple(ip, attr); 941 gfs2_trans_end(GFS2_SB(&ip->i_inode)); 942 return error; 943 } 944 945 void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf) 946 { 947 struct gfs2_dinode *str = buf; 948 949 str->di_header.mh_magic = cpu_to_be32(GFS2_MAGIC); 950 str->di_header.mh_type = cpu_to_be32(GFS2_METATYPE_DI); 951 str->di_header.mh_format = cpu_to_be32(GFS2_FORMAT_DI); 952 str->di_num.no_addr = cpu_to_be64(ip->i_no_addr); 953 str->di_num.no_formal_ino = cpu_to_be64(ip->i_no_formal_ino); 954 str->di_mode = cpu_to_be32(ip->i_inode.i_mode); 955 str->di_uid = cpu_to_be32(ip->i_inode.i_uid); 956 str->di_gid = cpu_to_be32(ip->i_inode.i_gid); 957 str->di_nlink = cpu_to_be32(ip->i_inode.i_nlink); 958 str->di_size = cpu_to_be64(ip->i_disksize); 959 str->di_blocks = cpu_to_be64(gfs2_get_inode_blocks(&ip->i_inode)); 960 str->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec); 961 str->di_mtime = cpu_to_be64(ip->i_inode.i_mtime.tv_sec); 962 str->di_ctime = cpu_to_be64(ip->i_inode.i_ctime.tv_sec); 963 964 str->di_goal_meta = cpu_to_be64(ip->i_goal); 965 str->di_goal_data = cpu_to_be64(ip->i_goal); 966 str->di_generation = cpu_to_be64(ip->i_generation); 967 968 str->di_flags = cpu_to_be32(ip->i_diskflags); 969 str->di_height = cpu_to_be16(ip->i_height); 970 str->di_payload_format = cpu_to_be32(S_ISDIR(ip->i_inode.i_mode) && 971 !(ip->i_diskflags & GFS2_DIF_EXHASH) ? 972 GFS2_FORMAT_DE : 0); 973 str->di_depth = cpu_to_be16(ip->i_depth); 974 str->di_entries = cpu_to_be32(ip->i_entries); 975 976 str->di_eattr = cpu_to_be64(ip->i_eattr); 977 str->di_atime_nsec = cpu_to_be32(ip->i_inode.i_atime.tv_nsec); 978 str->di_mtime_nsec = cpu_to_be32(ip->i_inode.i_mtime.tv_nsec); 979 str->di_ctime_nsec = cpu_to_be32(ip->i_inode.i_ctime.tv_nsec); 980 } 981 982 void gfs2_dinode_print(const struct gfs2_inode *ip) 983 { 984 printk(KERN_INFO " no_formal_ino = %llu\n", 985 (unsigned long long)ip->i_no_formal_ino); 986 printk(KERN_INFO " no_addr = %llu\n", 987 (unsigned long long)ip->i_no_addr); 988 printk(KERN_INFO " i_disksize = %llu\n", 989 (unsigned long long)ip->i_disksize); 990 printk(KERN_INFO " blocks = %llu\n", 991 (unsigned long long)gfs2_get_inode_blocks(&ip->i_inode)); 992 printk(KERN_INFO " i_goal = %llu\n", 993 (unsigned long long)ip->i_goal); 994 printk(KERN_INFO " i_diskflags = 0x%.8X\n", ip->i_diskflags); 995 printk(KERN_INFO " i_height = %u\n", ip->i_height); 996 printk(KERN_INFO " i_depth = %u\n", ip->i_depth); 997 printk(KERN_INFO " i_entries = %u\n", ip->i_entries); 998 printk(KERN_INFO " i_eattr = %llu\n", 999 (unsigned long long)ip->i_eattr); 1000 } 1001 1002