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 41static int iget_test(struct inode *inode, void *opaque) 42{ 43 struct gfs2_inode *ip = GFS2_I(inode); 44 struct gfs2_inum_host *inum = opaque; 45 46 if (ip->i_num.no_addr == inum->no_addr && 47 inode->i_private != NULL) 48 return 1; 49 50 return 0; 51} 52 53static int iget_set(struct inode *inode, void *opaque) 54{ 55 struct gfs2_inode *ip = GFS2_I(inode); 56 struct gfs2_inum_host *inum = opaque; 57 58 ip->i_num = *inum; 59 inode->i_ino = inum->no_addr; 60 return 0; 61} 62 63struct inode *gfs2_ilookup(struct super_block *sb, struct gfs2_inum_host *inum) 64{ 65 return ilookup5(sb, (unsigned long)inum->no_addr, 66 iget_test, inum); 67} 68 69static struct inode *gfs2_iget(struct super_block *sb, struct gfs2_inum_host *inum) 70{ 71 return iget5_locked(sb, (unsigned long)inum->no_addr, 72 iget_test, iget_set, inum); 73} 74 75/** 76 * gfs2_inode_lookup - Lookup an inode 77 * @sb: The super block 78 * @inum: The inode number 79 * @type: The type of the inode 80 * 81 * Returns: A VFS inode, or an error 82 */ 83 84struct inode *gfs2_inode_lookup(struct super_block *sb, struct gfs2_inum_host *inum, unsigned int type) 85{ 86 struct inode *inode = gfs2_iget(sb, inum); 87 struct gfs2_inode *ip = GFS2_I(inode); 88 struct gfs2_glock *io_gl; 89 int error; 90 91 if (!inode) 92 return ERR_PTR(-ENOBUFS); 93 94 if (inode->i_state & I_NEW) { 95 struct gfs2_sbd *sdp = GFS2_SB(inode); 96 umode_t mode = DT2IF(type); 97 inode->i_private = ip; 98 inode->i_mode = mode; 99 100 if (S_ISREG(mode)) { 101 inode->i_op = &gfs2_file_iops; 102 inode->i_fop = &gfs2_file_fops; 103 inode->i_mapping->a_ops = &gfs2_file_aops; 104 } else if (S_ISDIR(mode)) { 105 inode->i_op = &gfs2_dir_iops; 106 inode->i_fop = &gfs2_dir_fops; 107 } else if (S_ISLNK(mode)) { 108 inode->i_op = &gfs2_symlink_iops; 109 } else { 110 inode->i_op = &gfs2_dev_iops; 111 } 112 113 error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); 114 if (unlikely(error)) 115 goto fail; 116 ip->i_gl->gl_object = ip; 117 118 error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_iopen_glops, CREATE, &io_gl); 119 if (unlikely(error)) 120 goto fail_put; 121 122 set_bit(GIF_INVALID, &ip->i_flags); 123 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); 124 if (unlikely(error)) 125 goto fail_iopen; 126 127 gfs2_glock_put(io_gl); 128 unlock_new_inode(inode); 129 } 130 131 return inode; 132fail_iopen: 133 gfs2_glock_put(io_gl); 134fail_put: 135 ip->i_gl->gl_object = NULL; 136 gfs2_glock_put(ip->i_gl); 137fail: 138 iput(inode); 139 return ERR_PTR(error); 140} 141 142static int gfs2_dinode_in(struct gfs2_inode *ip, const void *buf) 143{ 144 struct gfs2_dinode_host *di = &ip->i_di; 145 const struct gfs2_dinode *str = buf; 146 147 if (ip->i_num.no_addr != be64_to_cpu(str->di_num.no_addr)) { 148 if (gfs2_consist_inode(ip)) 149 gfs2_dinode_print(ip); 150 return -EIO; 151 } 152 if (ip->i_num.no_formal_ino != be64_to_cpu(str->di_num.no_formal_ino)) 153 return -ESTALE; 154 155 ip->i_inode.i_mode = be32_to_cpu(str->di_mode); 156 ip->i_inode.i_rdev = 0; 157 switch (ip->i_inode.i_mode & S_IFMT) { 158 case S_IFBLK: 159 case S_IFCHR: 160 ip->i_inode.i_rdev = MKDEV(be32_to_cpu(str->di_major), 161 be32_to_cpu(str->di_minor)); 162 break; 163 }; 164 165 ip->i_inode.i_uid = be32_to_cpu(str->di_uid); 166 ip->i_inode.i_gid = be32_to_cpu(str->di_gid); 167 /* 168 * We will need to review setting the nlink count here in the 169 * light of the forthcoming ro bind mount work. This is a reminder 170 * to do that. 171 */ 172 ip->i_inode.i_nlink = be32_to_cpu(str->di_nlink); 173 di->di_size = be64_to_cpu(str->di_size); 174 i_size_write(&ip->i_inode, di->di_size); 175 di->di_blocks = be64_to_cpu(str->di_blocks); 176 gfs2_set_inode_blocks(&ip->i_inode); 177 ip->i_inode.i_atime.tv_sec = be64_to_cpu(str->di_atime); 178 ip->i_inode.i_atime.tv_nsec = 0; 179 ip->i_inode.i_mtime.tv_sec = be64_to_cpu(str->di_mtime); 180 ip->i_inode.i_mtime.tv_nsec = 0; 181 ip->i_inode.i_ctime.tv_sec = be64_to_cpu(str->di_ctime); 182 ip->i_inode.i_ctime.tv_nsec = 0; 183 184 di->di_goal_meta = be64_to_cpu(str->di_goal_meta); 185 di->di_goal_data = be64_to_cpu(str->di_goal_data); 186 di->di_generation = be64_to_cpu(str->di_generation); 187 188 di->di_flags = be32_to_cpu(str->di_flags); 189 gfs2_set_inode_flags(&ip->i_inode); 190 di->di_height = be16_to_cpu(str->di_height); 191 192 di->di_depth = be16_to_cpu(str->di_depth); 193 di->di_entries = be32_to_cpu(str->di_entries); 194 195 di->di_eattr = be64_to_cpu(str->di_eattr); 196 return 0; 197} 198 199/** 200 * gfs2_inode_refresh - Refresh the incore copy of the dinode 201 * @ip: The GFS2 inode 202 * 203 * Returns: errno 204 */ 205 206int gfs2_inode_refresh(struct gfs2_inode *ip) 207{ 208 struct buffer_head *dibh; 209 int error; 210 211 error = gfs2_meta_inode_buffer(ip, &dibh); 212 if (error) 213 return error; 214 215 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), dibh, GFS2_METATYPE_DI)) { 216 brelse(dibh); 217 return -EIO; 218 } 219 220 error = gfs2_dinode_in(ip, dibh->b_data); 221 brelse(dibh); 222 clear_bit(GIF_INVALID, &ip->i_flags); 223 224 return error; 225} 226 227int gfs2_dinode_dealloc(struct gfs2_inode *ip) 228{ 229 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 230 struct gfs2_alloc *al; 231 struct gfs2_rgrpd *rgd; 232 int error; 233 234 if (ip->i_di.di_blocks != 1) { 235 if (gfs2_consist_inode(ip)) 236 gfs2_dinode_print(ip); 237 return -EIO; 238 } 239 240 al = gfs2_alloc_get(ip); 241 242 error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); 243 if (error) 244 goto out; 245 246 error = gfs2_rindex_hold(sdp, &al->al_ri_gh); 247 if (error) 248 goto out_qs; 249 250 rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr); 251 if (!rgd) { 252 gfs2_consist_inode(ip); 253 error = -EIO; 254 goto out_rindex_relse; 255 } 256 257 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, 258 &al->al_rgd_gh); 259 if (error) 260 goto out_rindex_relse; 261 262 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 1); 263 if (error) 264 goto out_rg_gunlock; 265 266 gfs2_trans_add_gl(ip->i_gl); 267 268 gfs2_free_di(rgd, ip); 269 270 gfs2_trans_end(sdp); 271 clear_bit(GLF_STICKY, &ip->i_gl->gl_flags); 272 273out_rg_gunlock: 274 gfs2_glock_dq_uninit(&al->al_rgd_gh); 275out_rindex_relse: 276 gfs2_glock_dq_uninit(&al->al_ri_gh); 277out_qs: 278 gfs2_quota_unhold(ip); 279out: 280 gfs2_alloc_put(ip); 281 return error; 282} 283 284/** 285 * gfs2_change_nlink - Change nlink count on inode 286 * @ip: The GFS2 inode 287 * @diff: The change in the nlink count required 288 * 289 * Returns: errno 290 */ 291int gfs2_change_nlink(struct gfs2_inode *ip, int diff) 292{ 293 struct buffer_head *dibh; 294 u32 nlink; 295 int error; 296 297 BUG_ON(diff != 1 && diff != -1); 298 nlink = ip->i_inode.i_nlink + diff; 299 300 /* If we are reducing the nlink count, but the new value ends up being 301 bigger than the old one, we must have underflowed. */ 302 if (diff < 0 && nlink > ip->i_inode.i_nlink) { 303 if (gfs2_consist_inode(ip)) 304 gfs2_dinode_print(ip); 305 return -EIO; 306 } 307 308 error = gfs2_meta_inode_buffer(ip, &dibh); 309 if (error) 310 return error; 311 312 if (diff > 0) 313 inc_nlink(&ip->i_inode); 314 else 315 drop_nlink(&ip->i_inode); 316 317 ip->i_inode.i_ctime = CURRENT_TIME_SEC; 318 319 gfs2_trans_add_bh(ip->i_gl, dibh, 1); 320 gfs2_dinode_out(ip, dibh->b_data); 321 brelse(dibh); 322 mark_inode_dirty(&ip->i_inode); 323 324 if (ip->i_inode.i_nlink == 0) 325 gfs2_unlink_di(&ip->i_inode); /* mark inode unlinked */ 326 327 return error; 328} 329 330struct inode *gfs2_lookup_simple(struct inode *dip, const char *name) 331{ 332 struct qstr qstr; 333 struct inode *inode; 334 gfs2_str2qstr(&qstr, name); 335 inode = gfs2_lookupi(dip, &qstr, 1, NULL); 336 /* gfs2_lookupi has inconsistent callers: vfs 337 * related routines expect NULL for no entry found, 338 * gfs2_lookup_simple callers expect ENOENT 339 * and do not check for NULL. 340 */ 341 if (inode == NULL) 342 return ERR_PTR(-ENOENT); 343 else 344 return inode; 345} 346 347 348/** 349 * gfs2_lookupi - Look up a filename in a directory and return its inode 350 * @d_gh: An initialized holder for the directory glock 351 * @name: The name of the inode to look for 352 * @is_root: If 1, ignore the caller's permissions 353 * @i_gh: An uninitialized holder for the new inode glock 354 * 355 * This can be called via the VFS filldir function when NFS is doing 356 * a readdirplus and the inode which its intending to stat isn't 357 * already in cache. In this case we must not take the directory glock 358 * again, since the readdir call will have already taken that lock. 359 * 360 * Returns: errno 361 */ 362 363struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name, 364 int is_root, struct nameidata *nd) 365{ 366 struct super_block *sb = dir->i_sb; 367 struct gfs2_inode *dip = GFS2_I(dir); 368 struct gfs2_holder d_gh; 369 struct gfs2_inum_host inum; 370 unsigned int type; 371 int error; 372 struct inode *inode = NULL; 373 int unlock = 0; 374 375 if (!name->len || name->len > GFS2_FNAMESIZE) 376 return ERR_PTR(-ENAMETOOLONG); 377 378 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) || 379 (name->len == 2 && memcmp(name->name, "..", 2) == 0 && 380 dir == sb->s_root->d_inode)) { 381 igrab(dir); 382 return dir; 383 } 384 385 if (gfs2_glock_is_locked_by_me(dip->i_gl) == 0) { 386 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); 387 if (error) 388 return ERR_PTR(error); 389 unlock = 1; 390 } 391 392 if (!is_root) { 393 error = permission(dir, MAY_EXEC, NULL); 394 if (error) 395 goto out; 396 } 397 398 error = gfs2_dir_search(dir, name, &inum, &type); 399 if (error) 400 goto out; 401 402 inode = gfs2_inode_lookup(sb, &inum, type); 403 404out: 405 if (unlock) 406 gfs2_glock_dq_uninit(&d_gh); 407 if (error == -ENOENT) 408 return NULL; 409 return inode ? inode : ERR_PTR(error); 410} 411 412static int pick_formal_ino_1(struct gfs2_sbd *sdp, u64 *formal_ino) 413{ 414 struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode); 415 struct buffer_head *bh; 416 struct gfs2_inum_range_host ir; 417 int error; 418 419 error = gfs2_trans_begin(sdp, RES_DINODE, 0); 420 if (error) 421 return error; 422 mutex_lock(&sdp->sd_inum_mutex); 423 424 error = gfs2_meta_inode_buffer(ip, &bh); 425 if (error) { 426 mutex_unlock(&sdp->sd_inum_mutex); 427 gfs2_trans_end(sdp); 428 return error; 429 } 430 431 gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode)); 432 433 if (ir.ir_length) { 434 *formal_ino = ir.ir_start++; 435 ir.ir_length--; 436 gfs2_trans_add_bh(ip->i_gl, bh, 1); 437 gfs2_inum_range_out(&ir, 438 bh->b_data + sizeof(struct gfs2_dinode)); 439 brelse(bh); 440 mutex_unlock(&sdp->sd_inum_mutex); 441 gfs2_trans_end(sdp); 442 return 0; 443 } 444 445 brelse(bh); 446 447 mutex_unlock(&sdp->sd_inum_mutex); 448 gfs2_trans_end(sdp); 449 450 return 1; 451} 452 453static int pick_formal_ino_2(struct gfs2_sbd *sdp, u64 *formal_ino) 454{ 455 struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode); 456 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_inum_inode); 457 struct gfs2_holder gh; 458 struct buffer_head *bh; 459 struct gfs2_inum_range_host ir; 460 int error; 461 462 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 463 if (error) 464 return error; 465 466 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0); 467 if (error) 468 goto out; 469 mutex_lock(&sdp->sd_inum_mutex); 470 471 error = gfs2_meta_inode_buffer(ip, &bh); 472 if (error) 473 goto out_end_trans; 474 475 gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode)); 476 477 if (!ir.ir_length) { 478 struct buffer_head *m_bh; 479 u64 x, y; 480 __be64 z; 481 482 error = gfs2_meta_inode_buffer(m_ip, &m_bh); 483 if (error) 484 goto out_brelse; 485 486 z = *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode)); 487 x = y = be64_to_cpu(z); 488 ir.ir_start = x; 489 ir.ir_length = GFS2_INUM_QUANTUM; 490 x += GFS2_INUM_QUANTUM; 491 if (x < y) 492 gfs2_consist_inode(m_ip); 493 z = cpu_to_be64(x); 494 gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1); 495 *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = z; 496 497 brelse(m_bh); 498 } 499 500 *formal_ino = ir.ir_start++; 501 ir.ir_length--; 502 503 gfs2_trans_add_bh(ip->i_gl, bh, 1); 504 gfs2_inum_range_out(&ir, bh->b_data + sizeof(struct gfs2_dinode)); 505 506out_brelse: 507 brelse(bh); 508out_end_trans: 509 mutex_unlock(&sdp->sd_inum_mutex); 510 gfs2_trans_end(sdp); 511out: 512 gfs2_glock_dq_uninit(&gh); 513 return error; 514} 515 516static int pick_formal_ino(struct gfs2_sbd *sdp, u64 *inum) 517{ 518 int error; 519 520 error = pick_formal_ino_1(sdp, inum); 521 if (error <= 0) 522 return error; 523 524 error = pick_formal_ino_2(sdp, inum); 525 526 return error; 527} 528 529/** 530 * create_ok - OK to create a new on-disk inode here? 531 * @dip: Directory in which dinode is to be created 532 * @name: Name of new dinode 533 * @mode: 534 * 535 * Returns: errno 536 */ 537 538static int create_ok(struct gfs2_inode *dip, const struct qstr *name, 539 unsigned int mode) 540{ 541 int error; 542 543 error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL); 544 if (error) 545 return error; 546 547 /* Don't create entries in an unlinked directory */ 548 if (!dip->i_inode.i_nlink) 549 return -EPERM; 550 551 error = gfs2_dir_search(&dip->i_inode, name, NULL, NULL); 552 switch (error) { 553 case -ENOENT: 554 error = 0; 555 break; 556 case 0: 557 return -EEXIST; 558 default: 559 return error; 560 } 561 562 if (dip->i_di.di_entries == (u32)-1) 563 return -EFBIG; 564 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1) 565 return -EMLINK; 566 567 return 0; 568} 569 570static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode, 571 unsigned int *uid, unsigned int *gid) 572{ 573 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir && 574 (dip->i_inode.i_mode & S_ISUID) && dip->i_inode.i_uid) { 575 if (S_ISDIR(*mode)) 576 *mode |= S_ISUID; 577 else if (dip->i_inode.i_uid != current->fsuid) 578 *mode &= ~07111; 579 *uid = dip->i_inode.i_uid; 580 } else 581 *uid = current->fsuid; 582 583 if (dip->i_inode.i_mode & S_ISGID) { 584 if (S_ISDIR(*mode)) 585 *mode |= S_ISGID; 586 *gid = dip->i_inode.i_gid; 587 } else 588 *gid = current->fsgid; 589} 590 591static int alloc_dinode(struct gfs2_inode *dip, struct gfs2_inum_host *inum, 592 u64 *generation) 593{ 594 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 595 int error; 596 597 gfs2_alloc_get(dip); 598 599 dip->i_alloc.al_requested = RES_DINODE; 600 error = gfs2_inplace_reserve(dip); 601 if (error) 602 goto out; 603 604 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0); 605 if (error) 606 goto out_ipreserv; 607 608 inum->no_addr = gfs2_alloc_di(dip, generation); 609 610 gfs2_trans_end(sdp); 611 612out_ipreserv: 613 gfs2_inplace_release(dip); 614out: 615 gfs2_alloc_put(dip); 616 return error; 617} 618 619/** 620 * init_dinode - Fill in a new dinode structure 621 * @dip: the directory this inode is being created in 622 * @gl: The glock covering the new inode 623 * @inum: the inode number 624 * @mode: the file permissions 625 * @uid: 626 * @gid: 627 * 628 */ 629 630static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, 631 const struct gfs2_inum_host *inum, unsigned int mode, 632 unsigned int uid, unsigned int gid, 633 const u64 *generation, dev_t dev) 634{ 635 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 636 struct gfs2_dinode *di; 637 struct buffer_head *dibh; 638 639 dibh = gfs2_meta_new(gl, inum->no_addr); 640 gfs2_trans_add_bh(gl, dibh, 1); 641 gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI); 642 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); 643 di = (struct gfs2_dinode *)dibh->b_data; 644 645 di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino); 646 di->di_num.no_addr = cpu_to_be64(inum->no_addr); 647 di->di_mode = cpu_to_be32(mode); 648 di->di_uid = cpu_to_be32(uid); 649 di->di_gid = cpu_to_be32(gid); 650 di->di_nlink = 0; 651 di->di_size = 0; 652 di->di_blocks = cpu_to_be64(1); 653 di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(get_seconds()); 654 di->di_major = cpu_to_be32(MAJOR(dev)); 655 di->di_minor = cpu_to_be32(MINOR(dev)); 656 di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr); 657 di->di_generation = cpu_to_be64(*generation); 658 di->di_flags = 0; 659 660 if (S_ISREG(mode)) { 661 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA) || 662 gfs2_tune_get(sdp, gt_new_files_jdata)) 663 di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA); 664 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO) || 665 gfs2_tune_get(sdp, gt_new_files_directio)) 666 di->di_flags |= cpu_to_be32(GFS2_DIF_DIRECTIO); 667 } else if (S_ISDIR(mode)) { 668 di->di_flags |= cpu_to_be32(dip->i_di.di_flags & 669 GFS2_DIF_INHERIT_DIRECTIO); 670 di->di_flags |= cpu_to_be32(dip->i_di.di_flags & 671 GFS2_DIF_INHERIT_JDATA); 672 } 673 674 di->__pad1 = 0; 675 di->di_payload_format = cpu_to_be32(S_ISDIR(mode) ? GFS2_FORMAT_DE : 0); 676 di->di_height = 0; 677 di->__pad2 = 0; 678 di->__pad3 = 0; 679 di->di_depth = 0; 680 di->di_entries = 0; 681 memset(&di->__pad4, 0, sizeof(di->__pad4)); 682 di->di_eattr = 0; 683 memset(&di->di_reserved, 0, sizeof(di->di_reserved)); 684 685 brelse(dibh); 686} 687 688static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, 689 unsigned int mode, const struct gfs2_inum_host *inum, 690 const u64 *generation, dev_t dev) 691{ 692 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 693 unsigned int uid, gid; 694 int error; 695 696 munge_mode_uid_gid(dip, &mode, &uid, &gid); 697 gfs2_alloc_get(dip); 698 699 error = gfs2_quota_lock(dip, uid, gid); 700 if (error) 701 goto out; 702 703 error = gfs2_quota_check(dip, uid, gid); 704 if (error) 705 goto out_quota; 706 707 error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0); 708 if (error) 709 goto out_quota; 710 711 init_dinode(dip, gl, inum, mode, uid, gid, generation, dev); 712 gfs2_quota_change(dip, +1, uid, gid); 713 gfs2_trans_end(sdp); 714 715out_quota: 716 gfs2_quota_unlock(dip); 717out: 718 gfs2_alloc_put(dip); 719 return error; 720} 721 722static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, 723 struct gfs2_inode *ip) 724{ 725 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 726 struct gfs2_alloc *al; 727 int alloc_required; 728 struct buffer_head *dibh; 729 int error; 730 731 al = gfs2_alloc_get(dip); 732 733 error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); 734 if (error) 735 goto fail; 736 737 error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name); 738 if (alloc_required < 0) 739 goto fail; 740 if (alloc_required) { 741 error = gfs2_quota_check(dip, dip->i_inode.i_uid, dip->i_inode.i_gid); 742 if (error) 743 goto fail_quota_locks; 744 745 al->al_requested = sdp->sd_max_dirres; 746 747 error = gfs2_inplace_reserve(dip); 748 if (error) 749 goto fail_quota_locks; 750 751 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + 752 al->al_rgd->rd_ri.ri_length + 753 2 * RES_DINODE + 754 RES_STATFS + RES_QUOTA, 0); 755 if (error) 756 goto fail_ipreserv; 757 } else { 758 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); 759 if (error) 760 goto fail_quota_locks; 761 } 762 763 error = gfs2_dir_add(&dip->i_inode, name, &ip->i_num, IF2DT(ip->i_inode.i_mode)); 764 if (error) 765 goto fail_end_trans; 766 767 error = gfs2_meta_inode_buffer(ip, &dibh); 768 if (error) 769 goto fail_end_trans; 770 ip->i_inode.i_nlink = 1; 771 gfs2_trans_add_bh(ip->i_gl, dibh, 1); 772 gfs2_dinode_out(ip, dibh->b_data); 773 brelse(dibh); 774 return 0; 775 776fail_end_trans: 777 gfs2_trans_end(sdp); 778 779fail_ipreserv: 780 if (dip->i_alloc.al_rgd) 781 gfs2_inplace_release(dip); 782 783fail_quota_locks: 784 gfs2_quota_unlock(dip); 785 786fail: 787 gfs2_alloc_put(dip); 788 return error; 789} 790 791static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip) 792{ 793 int err; 794 size_t len; 795 void *value; 796 char *name; 797 struct gfs2_ea_request er; 798 799 err = security_inode_init_security(&ip->i_inode, &dip->i_inode, 800 &name, &value, &len); 801 802 if (err) { 803 if (err == -EOPNOTSUPP) 804 return 0; 805 return err; 806 } 807 808 memset(&er, 0, sizeof(struct gfs2_ea_request)); 809 810 er.er_type = GFS2_EATYPE_SECURITY; 811 er.er_name = name; 812 er.er_data = value; 813 er.er_name_len = strlen(name); 814 er.er_data_len = len; 815 816 err = gfs2_ea_set_i(ip, &er); 817 818 kfree(value); 819 kfree(name); 820 821 return err; 822} 823 824/** 825 * gfs2_createi - Create a new inode 826 * @ghs: An array of two holders 827 * @name: The name of the new file 828 * @mode: the permissions on the new inode 829 * 830 * @ghs[0] is an initialized holder for the directory 831 * @ghs[1] is the holder for the inode lock 832 * 833 * If the return value is not NULL, the glocks on both the directory and the new 834 * file are held. A transaction has been started and an inplace reservation 835 * is held, as well. 836 * 837 * Returns: An inode 838 */ 839 840struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name, 841 unsigned int mode, dev_t dev) 842{ 843 struct inode *inode; 844 struct gfs2_inode *dip = ghs->gh_gl->gl_object; 845 struct inode *dir = &dip->i_inode; 846 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 847 struct gfs2_inum_host inum; 848 int error; 849 u64 generation; 850 851 if (!name->len || name->len > GFS2_FNAMESIZE) 852 return ERR_PTR(-ENAMETOOLONG); 853 854 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs); 855 error = gfs2_glock_nq(ghs); 856 if (error) 857 goto fail; 858 859 error = create_ok(dip, name, mode); 860 if (error) 861 goto fail_gunlock; 862 863 error = pick_formal_ino(sdp, &inum.no_formal_ino); 864 if (error) 865 goto fail_gunlock; 866 867 error = alloc_dinode(dip, &inum, &generation); 868 if (error) 869 goto fail_gunlock; 870 871 error = gfs2_glock_nq_num(sdp, inum.no_addr, &gfs2_inode_glops, 872 LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1); 873 if (error) 874 goto fail_gunlock; 875 876 error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation, dev); 877 if (error) 878 goto fail_gunlock2; 879 880 inode = gfs2_inode_lookup(dir->i_sb, &inum, IF2DT(mode)); 881 if (IS_ERR(inode)) 882 goto fail_gunlock2; 883 884 error = gfs2_inode_refresh(GFS2_I(inode)); 885 if (error) 886 goto fail_iput; 887 888 error = gfs2_acl_create(dip, GFS2_I(inode)); 889 if (error) 890 goto fail_iput; 891 892 error = gfs2_security_init(dip, GFS2_I(inode)); 893 if (error) 894 goto fail_iput; 895 896 error = link_dinode(dip, name, GFS2_I(inode)); 897 if (error) 898 goto fail_iput; 899 900 if (!inode) 901 return ERR_PTR(-ENOMEM); 902 return inode; 903 904fail_iput: 905 iput(inode); 906fail_gunlock2: 907 gfs2_glock_dq_uninit(ghs + 1); 908fail_gunlock: 909 gfs2_glock_dq(ghs); 910fail: 911 return ERR_PTR(error); 912} 913 914/** 915 * gfs2_rmdiri - Remove a directory 916 * @dip: The parent directory of the directory to be removed 917 * @name: The name of the directory to be removed 918 * @ip: The GFS2 inode of the directory to be removed 919 * 920 * Assumes Glocks on dip and ip are held 921 * 922 * Returns: errno 923 */ 924 925int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name, 926 struct gfs2_inode *ip) 927{ 928 struct qstr dotname; 929 int error; 930 931 if (ip->i_di.di_entries != 2) { 932 if (gfs2_consist_inode(ip)) 933 gfs2_dinode_print(ip); 934 return -EIO; 935 } 936 937 error = gfs2_dir_del(dip, name); 938 if (error) 939 return error; 940 941 error = gfs2_change_nlink(dip, -1); 942 if (error) 943 return error; 944 945 gfs2_str2qstr(&dotname, "."); 946 error = gfs2_dir_del(ip, &dotname); 947 if (error) 948 return error; 949 950 gfs2_str2qstr(&dotname, ".."); 951 error = gfs2_dir_del(ip, &dotname); 952 if (error) 953 return error; 954 955 /* It looks odd, but it really should be done twice */ 956 error = gfs2_change_nlink(ip, -1); 957 if (error) 958 return error; 959 960 error = gfs2_change_nlink(ip, -1); 961 if (error) 962 return error; 963 964 return error; 965} 966 967/* 968 * gfs2_unlink_ok - check to see that a inode is still in a directory 969 * @dip: the directory 970 * @name: the name of the file 971 * @ip: the inode 972 * 973 * Assumes that the lock on (at least) @dip is held. 974 * 975 * Returns: 0 if the parent/child relationship is correct, errno if it isn't 976 */ 977 978int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, 979 struct gfs2_inode *ip) 980{ 981 struct gfs2_inum_host inum; 982 unsigned int type; 983 int error; 984 985 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) 986 return -EPERM; 987 988 if ((dip->i_inode.i_mode & S_ISVTX) && 989 dip->i_inode.i_uid != current->fsuid && 990 ip->i_inode.i_uid != current->fsuid && !capable(CAP_FOWNER)) 991 return -EPERM; 992 993 if (IS_APPEND(&dip->i_inode)) 994 return -EPERM; 995 996 error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL); 997 if (error) 998 return error; 999 1000 error = gfs2_dir_search(&dip->i_inode, name, &inum, &type); 1001 if (error) 1002 return error; 1003 1004 if (!gfs2_inum_equal(&inum, &ip->i_num)) 1005 return -ENOENT; 1006 1007 if (IF2DT(ip->i_inode.i_mode) != type) { 1008 gfs2_consist_inode(dip); 1009 return -EIO; 1010 } 1011 1012 return 0; 1013} 1014 1015/* 1016 * gfs2_ok_to_move - check if it's ok to move a directory to another directory 1017 * @this: move this 1018 * @to: to here 1019 * 1020 * Follow @to back to the root and make sure we don't encounter @this 1021 * Assumes we already hold the rename lock. 1022 * 1023 * Returns: errno 1024 */ 1025 1026int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) 1027{ 1028 struct inode *dir = &to->i_inode; 1029 struct super_block *sb = dir->i_sb; 1030 struct inode *tmp; 1031 struct qstr dotdot; 1032 int error = 0; 1033 1034 gfs2_str2qstr(&dotdot, ".."); 1035 1036 igrab(dir); 1037 1038 for (;;) { 1039 if (dir == &this->i_inode) { 1040 error = -EINVAL; 1041 break; 1042 } 1043 if (dir == sb->s_root->d_inode) { 1044 error = 0; 1045 break; 1046 } 1047 1048 tmp = gfs2_lookupi(dir, &dotdot, 1, NULL); 1049 if (IS_ERR(tmp)) { 1050 error = PTR_ERR(tmp); 1051 break; 1052 } 1053 1054 iput(dir); 1055 dir = tmp; 1056 } 1057 1058 iput(dir); 1059 1060 return error; 1061} 1062 1063/** 1064 * gfs2_readlinki - return the contents of a symlink 1065 * @ip: the symlink's inode 1066 * @buf: a pointer to the buffer to be filled 1067 * @len: a pointer to the length of @buf 1068 * 1069 * If @buf is too small, a piece of memory is kmalloc()ed and needs 1070 * to be freed by the caller. 1071 * 1072 * Returns: errno 1073 */ 1074 1075int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len) 1076{ 1077 struct gfs2_holder i_gh; 1078 struct buffer_head *dibh; 1079 unsigned int x; 1080 int error; 1081 1082 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh); 1083 error = gfs2_glock_nq_atime(&i_gh); 1084 if (error) { 1085 gfs2_holder_uninit(&i_gh); 1086 return error; 1087 } 1088 1089 if (!ip->i_di.di_size) { 1090 gfs2_consist_inode(ip); 1091 error = -EIO; 1092 goto out; 1093 } 1094 1095 error = gfs2_meta_inode_buffer(ip, &dibh); 1096 if (error) 1097 goto out; 1098 1099 x = ip->i_di.di_size + 1; 1100 if (x > *len) { 1101 *buf = kmalloc(x, GFP_KERNEL); 1102 if (!*buf) { 1103 error = -ENOMEM; 1104 goto out_brelse; 1105 } 1106 } 1107 1108 memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x); 1109 *len = x; 1110 1111out_brelse: 1112 brelse(dibh); 1113out: 1114 gfs2_glock_dq_uninit(&i_gh); 1115 return error; 1116} 1117 1118/** 1119 * gfs2_glock_nq_atime - Acquire a hold on an inode's glock, and 1120 * conditionally update the inode's atime 1121 * @gh: the holder to acquire 1122 * 1123 * Tests atime (access time) for gfs2_read, gfs2_readdir and gfs2_mmap 1124 * Update if the difference between the current time and the inode's current 1125 * atime is greater than an interval specified at mount. 1126 * 1127 * Returns: errno 1128 */ 1129 1130int gfs2_glock_nq_atime(struct gfs2_holder *gh) 1131{ 1132 struct gfs2_glock *gl = gh->gh_gl; 1133 struct gfs2_sbd *sdp = gl->gl_sbd; 1134 struct gfs2_inode *ip = gl->gl_object; 1135 s64 curtime, quantum = gfs2_tune_get(sdp, gt_atime_quantum); 1136 unsigned int state; 1137 int flags; 1138 int error; 1139 1140 if (gfs2_assert_warn(sdp, gh->gh_flags & GL_ATIME) || 1141 gfs2_assert_warn(sdp, !(gh->gh_flags & GL_ASYNC)) || 1142 gfs2_assert_warn(sdp, gl->gl_ops == &gfs2_inode_glops)) 1143 return -EINVAL; 1144 1145 state = gh->gh_state; 1146 flags = gh->gh_flags; 1147 1148 error = gfs2_glock_nq(gh); 1149 if (error) 1150 return error; 1151 1152 if (test_bit(SDF_NOATIME, &sdp->sd_flags) || 1153 (sdp->sd_vfs->s_flags & MS_RDONLY)) 1154 return 0; 1155 1156 curtime = get_seconds(); 1157 if (curtime - ip->i_inode.i_atime.tv_sec >= quantum) { 1158 gfs2_glock_dq(gh); 1159 gfs2_holder_reinit(LM_ST_EXCLUSIVE, gh->gh_flags & ~LM_FLAG_ANY, 1160 gh); 1161 error = gfs2_glock_nq(gh); 1162 if (error) 1163 return error; 1164 1165 /* Verify that atime hasn't been updated while we were 1166 trying to get exclusive lock. */ 1167 1168 curtime = get_seconds(); 1169 if (curtime - ip->i_inode.i_atime.tv_sec >= quantum) { 1170 struct buffer_head *dibh; 1171 struct gfs2_dinode *di; 1172 1173 error = gfs2_trans_begin(sdp, RES_DINODE, 0); 1174 if (error == -EROFS) 1175 return 0; 1176 if (error) 1177 goto fail; 1178 1179 error = gfs2_meta_inode_buffer(ip, &dibh); 1180 if (error) 1181 goto fail_end_trans; 1182 1183 ip->i_inode.i_atime.tv_sec = curtime; 1184 1185 gfs2_trans_add_bh(ip->i_gl, dibh, 1); 1186 di = (struct gfs2_dinode *)dibh->b_data; 1187 di->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec); 1188 brelse(dibh); 1189 1190 gfs2_trans_end(sdp); 1191 } 1192 1193 /* If someone else has asked for the glock, 1194 unlock and let them have it. Then reacquire 1195 in the original state. */ 1196 if (gfs2_glock_is_blocking(gl)) { 1197 gfs2_glock_dq(gh); 1198 gfs2_holder_reinit(state, flags, gh); 1199 return gfs2_glock_nq(gh); 1200 } 1201 } 1202 1203 return 0; 1204 1205fail_end_trans: 1206 gfs2_trans_end(sdp); 1207fail: 1208 gfs2_glock_dq(gh); 1209 return error; 1210} 1211 1212static int 1213__gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr) 1214{ 1215 struct buffer_head *dibh; 1216 int error; 1217 1218 error = gfs2_meta_inode_buffer(ip, &dibh); 1219 if (!error) { 1220 error = inode_setattr(&ip->i_inode, attr); 1221 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error); 1222 gfs2_trans_add_bh(ip->i_gl, dibh, 1); 1223 gfs2_dinode_out(ip, dibh->b_data); 1224 brelse(dibh); 1225 } 1226 return error; 1227} 1228 1229/** 1230 * gfs2_setattr_simple - 1231 * @ip: 1232 * @attr: 1233 * 1234 * Called with a reference on the vnode. 1235 * 1236 * Returns: errno 1237 */ 1238 1239int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr) 1240{ 1241 int error; 1242 1243 if (current->journal_info) 1244 return __gfs2_setattr_simple(ip, attr); 1245 1246 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0); 1247 if (error) 1248 return error; 1249 1250 error = __gfs2_setattr_simple(ip, attr); 1251 gfs2_trans_end(GFS2_SB(&ip->i_inode)); 1252 return error; 1253} 1254