1 /* 2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 3 * Copyright (C) 2004-2011 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/slab.h> 11 #include <linux/spinlock.h> 12 #include <linux/completion.h> 13 #include <linux/buffer_head.h> 14 #include <linux/namei.h> 15 #include <linux/mm.h> 16 #include <linux/xattr.h> 17 #include <linux/posix_acl.h> 18 #include <linux/gfs2_ondisk.h> 19 #include <linux/crc32.h> 20 #include <linux/fiemap.h> 21 #include <linux/security.h> 22 #include <asm/uaccess.h> 23 24 #include "gfs2.h" 25 #include "incore.h" 26 #include "acl.h" 27 #include "bmap.h" 28 #include "dir.h" 29 #include "xattr.h" 30 #include "glock.h" 31 #include "inode.h" 32 #include "meta_io.h" 33 #include "quota.h" 34 #include "rgrp.h" 35 #include "trans.h" 36 #include "util.h" 37 #include "super.h" 38 #include "glops.h" 39 40 struct gfs2_skip_data { 41 u64 no_addr; 42 int skipped; 43 int non_block; 44 }; 45 46 static int iget_test(struct inode *inode, void *opaque) 47 { 48 struct gfs2_inode *ip = GFS2_I(inode); 49 struct gfs2_skip_data *data = opaque; 50 51 if (ip->i_no_addr == data->no_addr) { 52 if (data->non_block && 53 inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE)) { 54 data->skipped = 1; 55 return 0; 56 } 57 return 1; 58 } 59 return 0; 60 } 61 62 static int iget_set(struct inode *inode, void *opaque) 63 { 64 struct gfs2_inode *ip = GFS2_I(inode); 65 struct gfs2_skip_data *data = opaque; 66 67 if (data->skipped) 68 return -ENOENT; 69 inode->i_ino = (unsigned long)(data->no_addr); 70 ip->i_no_addr = data->no_addr; 71 return 0; 72 } 73 74 struct inode *gfs2_ilookup(struct super_block *sb, u64 no_addr, int non_block) 75 { 76 unsigned long hash = (unsigned long)no_addr; 77 struct gfs2_skip_data data; 78 79 data.no_addr = no_addr; 80 data.skipped = 0; 81 data.non_block = non_block; 82 return ilookup5(sb, hash, iget_test, &data); 83 } 84 85 static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr, 86 int non_block) 87 { 88 struct gfs2_skip_data data; 89 unsigned long hash = (unsigned long)no_addr; 90 91 data.no_addr = no_addr; 92 data.skipped = 0; 93 data.non_block = non_block; 94 return iget5_locked(sb, hash, iget_test, iget_set, &data); 95 } 96 97 /** 98 * gfs2_set_iop - Sets inode operations 99 * @inode: The inode with correct i_mode filled in 100 * 101 * GFS2 lookup code fills in vfs inode contents based on info obtained 102 * from directory entry inside gfs2_inode_lookup(). 103 */ 104 105 static void gfs2_set_iop(struct inode *inode) 106 { 107 struct gfs2_sbd *sdp = GFS2_SB(inode); 108 umode_t mode = inode->i_mode; 109 110 if (S_ISREG(mode)) { 111 inode->i_op = &gfs2_file_iops; 112 if (gfs2_localflocks(sdp)) 113 inode->i_fop = &gfs2_file_fops_nolock; 114 else 115 inode->i_fop = &gfs2_file_fops; 116 } else if (S_ISDIR(mode)) { 117 inode->i_op = &gfs2_dir_iops; 118 if (gfs2_localflocks(sdp)) 119 inode->i_fop = &gfs2_dir_fops_nolock; 120 else 121 inode->i_fop = &gfs2_dir_fops; 122 } else if (S_ISLNK(mode)) { 123 inode->i_op = &gfs2_symlink_iops; 124 } else { 125 inode->i_op = &gfs2_file_iops; 126 init_special_inode(inode, inode->i_mode, inode->i_rdev); 127 } 128 } 129 130 /** 131 * gfs2_inode_lookup - Lookup an inode 132 * @sb: The super block 133 * @no_addr: The inode number 134 * @type: The type of the inode 135 * non_block: Can we block on inodes that are being freed? 136 * 137 * Returns: A VFS inode, or an error 138 */ 139 140 struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type, 141 u64 no_addr, u64 no_formal_ino, int non_block) 142 { 143 struct inode *inode; 144 struct gfs2_inode *ip; 145 struct gfs2_glock *io_gl = NULL; 146 int error; 147 148 inode = gfs2_iget(sb, no_addr, non_block); 149 ip = GFS2_I(inode); 150 151 if (!inode) 152 return ERR_PTR(-ENOBUFS); 153 154 if (inode->i_state & I_NEW) { 155 struct gfs2_sbd *sdp = GFS2_SB(inode); 156 ip->i_no_formal_ino = no_formal_ino; 157 158 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); 159 if (unlikely(error)) 160 goto fail; 161 ip->i_gl->gl_object = ip; 162 163 error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl); 164 if (unlikely(error)) 165 goto fail_put; 166 167 set_bit(GIF_INVALID, &ip->i_flags); 168 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); 169 if (unlikely(error)) 170 goto fail_iopen; 171 172 ip->i_iopen_gh.gh_gl->gl_object = ip; 173 gfs2_glock_put(io_gl); 174 io_gl = NULL; 175 176 if (type == DT_UNKNOWN) { 177 /* Inode glock must be locked already */ 178 error = gfs2_inode_refresh(GFS2_I(inode)); 179 if (error) 180 goto fail_refresh; 181 } else { 182 inode->i_mode = DT2IF(type); 183 } 184 185 gfs2_set_iop(inode); 186 unlock_new_inode(inode); 187 } 188 189 return inode; 190 191 fail_refresh: 192 ip->i_iopen_gh.gh_flags |= GL_NOCACHE; 193 ip->i_iopen_gh.gh_gl->gl_object = NULL; 194 gfs2_glock_dq_uninit(&ip->i_iopen_gh); 195 fail_iopen: 196 if (io_gl) 197 gfs2_glock_put(io_gl); 198 fail_put: 199 ip->i_gl->gl_object = NULL; 200 gfs2_glock_put(ip->i_gl); 201 fail: 202 iget_failed(inode); 203 return ERR_PTR(error); 204 } 205 206 struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr, 207 u64 *no_formal_ino, unsigned int blktype) 208 { 209 struct super_block *sb = sdp->sd_vfs; 210 struct gfs2_holder i_gh; 211 struct inode *inode = NULL; 212 int error; 213 214 /* Must not read in block until block type is verified */ 215 error = gfs2_glock_nq_num(sdp, no_addr, &gfs2_inode_glops, 216 LM_ST_EXCLUSIVE, GL_SKIP, &i_gh); 217 if (error) 218 return ERR_PTR(error); 219 220 error = gfs2_check_blk_type(sdp, no_addr, blktype); 221 if (error) 222 goto fail; 223 224 inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, 0, 1); 225 if (IS_ERR(inode)) 226 goto fail; 227 228 /* Two extra checks for NFS only */ 229 if (no_formal_ino) { 230 error = -ESTALE; 231 if (GFS2_I(inode)->i_no_formal_ino != *no_formal_ino) 232 goto fail_iput; 233 234 error = -EIO; 235 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM) 236 goto fail_iput; 237 238 error = 0; 239 } 240 241 fail: 242 gfs2_glock_dq_uninit(&i_gh); 243 return error ? ERR_PTR(error) : inode; 244 fail_iput: 245 iput(inode); 246 goto fail; 247 } 248 249 250 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name) 251 { 252 struct qstr qstr; 253 struct inode *inode; 254 gfs2_str2qstr(&qstr, name); 255 inode = gfs2_lookupi(dip, &qstr, 1); 256 /* gfs2_lookupi has inconsistent callers: vfs 257 * related routines expect NULL for no entry found, 258 * gfs2_lookup_simple callers expect ENOENT 259 * and do not check for NULL. 260 */ 261 if (inode == NULL) 262 return ERR_PTR(-ENOENT); 263 else 264 return inode; 265 } 266 267 268 /** 269 * gfs2_lookupi - Look up a filename in a directory and return its inode 270 * @d_gh: An initialized holder for the directory glock 271 * @name: The name of the inode to look for 272 * @is_root: If 1, ignore the caller's permissions 273 * @i_gh: An uninitialized holder for the new inode glock 274 * 275 * This can be called via the VFS filldir function when NFS is doing 276 * a readdirplus and the inode which its intending to stat isn't 277 * already in cache. In this case we must not take the directory glock 278 * again, since the readdir call will have already taken that lock. 279 * 280 * Returns: errno 281 */ 282 283 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name, 284 int is_root) 285 { 286 struct super_block *sb = dir->i_sb; 287 struct gfs2_inode *dip = GFS2_I(dir); 288 struct gfs2_holder d_gh; 289 int error = 0; 290 struct inode *inode = NULL; 291 int unlock = 0; 292 293 if (!name->len || name->len > GFS2_FNAMESIZE) 294 return ERR_PTR(-ENAMETOOLONG); 295 296 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) || 297 (name->len == 2 && memcmp(name->name, "..", 2) == 0 && 298 dir == sb->s_root->d_inode)) { 299 igrab(dir); 300 return dir; 301 } 302 303 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) { 304 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); 305 if (error) 306 return ERR_PTR(error); 307 unlock = 1; 308 } 309 310 if (!is_root) { 311 error = gfs2_permission(dir, MAY_EXEC); 312 if (error) 313 goto out; 314 } 315 316 inode = gfs2_dir_search(dir, name, false); 317 if (IS_ERR(inode)) 318 error = PTR_ERR(inode); 319 out: 320 if (unlock) 321 gfs2_glock_dq_uninit(&d_gh); 322 if (error == -ENOENT) 323 return NULL; 324 return inode ? inode : ERR_PTR(error); 325 } 326 327 /** 328 * create_ok - OK to create a new on-disk inode here? 329 * @dip: Directory in which dinode is to be created 330 * @name: Name of new dinode 331 * @mode: 332 * 333 * Returns: errno 334 */ 335 336 static int create_ok(struct gfs2_inode *dip, const struct qstr *name, 337 umode_t mode) 338 { 339 int error; 340 341 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC); 342 if (error) 343 return error; 344 345 /* Don't create entries in an unlinked directory */ 346 if (!dip->i_inode.i_nlink) 347 return -ENOENT; 348 349 if (dip->i_entries == (u32)-1) 350 return -EFBIG; 351 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1) 352 return -EMLINK; 353 354 return 0; 355 } 356 357 static void munge_mode_uid_gid(const struct gfs2_inode *dip, 358 struct inode *inode) 359 { 360 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir && 361 (dip->i_inode.i_mode & S_ISUID) && 362 !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) { 363 if (S_ISDIR(inode->i_mode)) 364 inode->i_mode |= S_ISUID; 365 else if (!uid_eq(dip->i_inode.i_uid, current_fsuid())) 366 inode->i_mode &= ~07111; 367 inode->i_uid = dip->i_inode.i_uid; 368 } else 369 inode->i_uid = current_fsuid(); 370 371 if (dip->i_inode.i_mode & S_ISGID) { 372 if (S_ISDIR(inode->i_mode)) 373 inode->i_mode |= S_ISGID; 374 inode->i_gid = dip->i_inode.i_gid; 375 } else 376 inode->i_gid = current_fsgid(); 377 } 378 379 static int alloc_dinode(struct gfs2_inode *ip, u32 flags) 380 { 381 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 382 int error; 383 int dblocks = 1; 384 385 error = gfs2_quota_lock_check(ip); 386 if (error) 387 goto out; 388 389 error = gfs2_inplace_reserve(ip, RES_DINODE, flags); 390 if (error) 391 goto out_quota; 392 393 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 0); 394 if (error) 395 goto out_ipreserv; 396 397 error = gfs2_alloc_blocks(ip, &ip->i_no_addr, &dblocks, 1, &ip->i_generation); 398 ip->i_no_formal_ino = ip->i_generation; 399 ip->i_inode.i_ino = ip->i_no_addr; 400 ip->i_goal = ip->i_no_addr; 401 402 gfs2_trans_end(sdp); 403 404 out_ipreserv: 405 gfs2_inplace_release(ip); 406 out_quota: 407 gfs2_quota_unlock(ip); 408 out: 409 return error; 410 } 411 412 static void gfs2_init_dir(struct buffer_head *dibh, 413 const struct gfs2_inode *parent) 414 { 415 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data; 416 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1); 417 418 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent); 419 dent->de_inum = di->di_num; /* already GFS2 endian */ 420 dent->de_type = cpu_to_be16(DT_DIR); 421 422 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1)); 423 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent); 424 gfs2_inum_out(parent, dent); 425 dent->de_type = cpu_to_be16(DT_DIR); 426 427 } 428 429 /** 430 * init_dinode - Fill in a new dinode structure 431 * @dip: The directory this inode is being created in 432 * @ip: The inode 433 * @symname: The symlink destination (if a symlink) 434 * @bhp: The buffer head (returned to caller) 435 * 436 */ 437 438 static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip, 439 const char *symname) 440 { 441 struct gfs2_dinode *di; 442 struct buffer_head *dibh; 443 444 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr); 445 gfs2_trans_add_meta(ip->i_gl, dibh); 446 di = (struct gfs2_dinode *)dibh->b_data; 447 gfs2_dinode_out(ip, di); 448 449 di->di_major = cpu_to_be32(MAJOR(ip->i_inode.i_rdev)); 450 di->di_minor = cpu_to_be32(MINOR(ip->i_inode.i_rdev)); 451 di->__pad1 = 0; 452 di->__pad2 = 0; 453 di->__pad3 = 0; 454 memset(&di->__pad4, 0, sizeof(di->__pad4)); 455 memset(&di->di_reserved, 0, sizeof(di->di_reserved)); 456 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); 457 458 switch(ip->i_inode.i_mode & S_IFMT) { 459 case S_IFDIR: 460 gfs2_init_dir(dibh, dip); 461 break; 462 case S_IFLNK: 463 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size); 464 break; 465 } 466 467 set_buffer_uptodate(dibh); 468 brelse(dibh); 469 } 470 471 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, 472 struct gfs2_inode *ip, int arq) 473 { 474 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 475 int error; 476 477 if (arq) { 478 error = gfs2_quota_lock_check(dip); 479 if (error) 480 goto fail_quota_locks; 481 482 error = gfs2_inplace_reserve(dip, sdp->sd_max_dirres, 0); 483 if (error) 484 goto fail_quota_locks; 485 486 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + 487 dip->i_rgd->rd_length + 488 2 * RES_DINODE + 489 RES_STATFS + RES_QUOTA, 0); 490 if (error) 491 goto fail_ipreserv; 492 } else { 493 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); 494 if (error) 495 goto fail_quota_locks; 496 } 497 498 error = gfs2_dir_add(&dip->i_inode, name, ip); 499 if (error) 500 goto fail_end_trans; 501 502 fail_end_trans: 503 gfs2_trans_end(sdp); 504 fail_ipreserv: 505 gfs2_inplace_release(dip); 506 fail_quota_locks: 507 gfs2_quota_unlock(dip); 508 return error; 509 } 510 511 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array, 512 void *fs_info) 513 { 514 const struct xattr *xattr; 515 int err = 0; 516 517 for (xattr = xattr_array; xattr->name != NULL; xattr++) { 518 err = __gfs2_xattr_set(inode, xattr->name, xattr->value, 519 xattr->value_len, 0, 520 GFS2_EATYPE_SECURITY); 521 if (err < 0) 522 break; 523 } 524 return err; 525 } 526 527 static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip, 528 const struct qstr *qstr) 529 { 530 return security_inode_init_security(&ip->i_inode, &dip->i_inode, qstr, 531 &gfs2_initxattrs, NULL); 532 } 533 534 /** 535 * gfs2_create_inode - Create a new inode 536 * @dir: The parent directory 537 * @dentry: The new dentry 538 * @mode: The permissions on the new inode 539 * @dev: For device nodes, this is the device number 540 * @symname: For symlinks, this is the link destination 541 * @size: The initial size of the inode (ignored for directories) 542 * 543 * Returns: 0 on success, or error code 544 */ 545 546 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry, 547 umode_t mode, dev_t dev, const char *symname, 548 unsigned int size, int excl) 549 { 550 const struct qstr *name = &dentry->d_name; 551 struct gfs2_holder ghs[2]; 552 struct inode *inode = NULL; 553 struct gfs2_inode *dip = GFS2_I(dir), *ip; 554 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 555 struct gfs2_glock *io_gl; 556 int error; 557 u32 aflags = 0; 558 int arq; 559 560 if (!name->len || name->len > GFS2_FNAMESIZE) 561 return -ENAMETOOLONG; 562 563 error = gfs2_rs_alloc(dip); 564 if (error) 565 return error; 566 567 error = gfs2_rindex_update(sdp); 568 if (error) 569 return error; 570 571 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 572 if (error) 573 goto fail; 574 575 error = create_ok(dip, name, mode); 576 if (error) 577 goto fail_gunlock; 578 579 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl); 580 error = PTR_ERR(inode); 581 if (!IS_ERR(inode)) { 582 gfs2_glock_dq_uninit(ghs); 583 d_instantiate(dentry, inode); 584 return 0; 585 } else if (error != -ENOENT) { 586 goto fail_gunlock; 587 } 588 589 arq = error = gfs2_diradd_alloc_required(dir, name); 590 if (error < 0) 591 goto fail_gunlock; 592 593 inode = new_inode(sdp->sd_vfs); 594 error = -ENOMEM; 595 if (!inode) 596 goto fail_gunlock; 597 598 ip = GFS2_I(inode); 599 error = gfs2_rs_alloc(ip); 600 if (error) 601 goto fail_free_inode; 602 603 inode->i_mode = mode; 604 set_nlink(inode, S_ISDIR(mode) ? 2 : 1); 605 inode->i_rdev = dev; 606 inode->i_size = size; 607 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 608 gfs2_set_inode_blocks(inode, 1); 609 munge_mode_uid_gid(dip, inode); 610 ip->i_goal = dip->i_goal; 611 ip->i_diskflags = 0; 612 ip->i_eattr = 0; 613 ip->i_height = 0; 614 ip->i_depth = 0; 615 ip->i_entries = 0; 616 617 switch(mode & S_IFMT) { 618 case S_IFREG: 619 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) || 620 gfs2_tune_get(sdp, gt_new_files_jdata)) 621 ip->i_diskflags |= GFS2_DIF_JDATA; 622 gfs2_set_aops(inode); 623 break; 624 case S_IFDIR: 625 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA); 626 ip->i_diskflags |= GFS2_DIF_JDATA; 627 ip->i_entries = 2; 628 break; 629 } 630 gfs2_set_inode_flags(inode); 631 632 if ((GFS2_I(sdp->sd_root_dir->d_inode) == dip) || 633 (dip->i_diskflags & GFS2_DIF_TOPDIR)) 634 aflags |= GFS2_AF_ORLOV; 635 636 error = alloc_dinode(ip, aflags); 637 if (error) 638 goto fail_free_inode; 639 640 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); 641 if (error) 642 goto fail_free_inode; 643 644 ip->i_gl->gl_object = ip; 645 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1); 646 if (error) 647 goto fail_free_inode; 648 649 error = gfs2_trans_begin(sdp, RES_DINODE, 0); 650 if (error) 651 goto fail_gunlock2; 652 653 init_dinode(dip, ip, symname); 654 gfs2_trans_end(sdp); 655 656 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl); 657 if (error) 658 goto fail_gunlock2; 659 660 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); 661 if (error) 662 goto fail_gunlock2; 663 664 ip->i_iopen_gh.gh_gl->gl_object = ip; 665 gfs2_glock_put(io_gl); 666 gfs2_set_iop(inode); 667 insert_inode_hash(inode); 668 669 error = gfs2_acl_create(dip, inode); 670 if (error) 671 goto fail_gunlock3; 672 673 error = gfs2_security_init(dip, ip, name); 674 if (error) 675 goto fail_gunlock3; 676 677 error = link_dinode(dip, name, ip, arq); 678 if (error) 679 goto fail_gunlock3; 680 681 mark_inode_dirty(inode); 682 gfs2_glock_dq_uninit(ghs); 683 gfs2_glock_dq_uninit(ghs + 1); 684 d_instantiate(dentry, inode); 685 return 0; 686 687 fail_gunlock3: 688 gfs2_glock_dq_uninit(ghs + 1); 689 if (ip->i_gl) 690 gfs2_glock_put(ip->i_gl); 691 goto fail_gunlock; 692 693 fail_gunlock2: 694 gfs2_glock_dq_uninit(ghs + 1); 695 fail_free_inode: 696 if (ip->i_gl) 697 gfs2_glock_put(ip->i_gl); 698 gfs2_rs_delete(ip); 699 free_inode_nonrcu(inode); 700 inode = NULL; 701 fail_gunlock: 702 gfs2_glock_dq_uninit(ghs); 703 if (inode && !IS_ERR(inode)) { 704 clear_nlink(inode); 705 mark_inode_dirty(inode); 706 set_bit(GIF_ALLOC_FAILED, &GFS2_I(inode)->i_flags); 707 iput(inode); 708 } 709 fail: 710 return error; 711 } 712 713 /** 714 * gfs2_create - Create a file 715 * @dir: The directory in which to create the file 716 * @dentry: The dentry of the new file 717 * @mode: The mode of the new file 718 * 719 * Returns: errno 720 */ 721 722 static int gfs2_create(struct inode *dir, struct dentry *dentry, 723 umode_t mode, bool excl) 724 { 725 return gfs2_create_inode(dir, dentry, S_IFREG | mode, 0, NULL, 0, excl); 726 } 727 728 /** 729 * gfs2_lookup - Look up a filename in a directory and return its inode 730 * @dir: The directory inode 731 * @dentry: The dentry of the new inode 732 * @nd: passed from Linux VFS, ignored by us 733 * 734 * Called by the VFS layer. Lock dir and call gfs2_lookupi() 735 * 736 * Returns: errno 737 */ 738 739 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry, 740 unsigned int flags) 741 { 742 struct inode *inode = gfs2_lookupi(dir, &dentry->d_name, 0); 743 if (inode && !IS_ERR(inode)) { 744 struct gfs2_glock *gl = GFS2_I(inode)->i_gl; 745 struct gfs2_holder gh; 746 int error; 747 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 748 if (error) { 749 iput(inode); 750 return ERR_PTR(error); 751 } 752 gfs2_glock_dq_uninit(&gh); 753 } 754 return d_splice_alias(inode, dentry); 755 } 756 757 /** 758 * gfs2_link - Link to a file 759 * @old_dentry: The inode to link 760 * @dir: Add link to this directory 761 * @dentry: The name of the link 762 * 763 * Link the inode in "old_dentry" into the directory "dir" with the 764 * name in "dentry". 765 * 766 * Returns: errno 767 */ 768 769 static int gfs2_link(struct dentry *old_dentry, struct inode *dir, 770 struct dentry *dentry) 771 { 772 struct gfs2_inode *dip = GFS2_I(dir); 773 struct gfs2_sbd *sdp = GFS2_SB(dir); 774 struct inode *inode = old_dentry->d_inode; 775 struct gfs2_inode *ip = GFS2_I(inode); 776 struct gfs2_holder ghs[2]; 777 struct buffer_head *dibh; 778 int alloc_required; 779 int error; 780 781 if (S_ISDIR(inode->i_mode)) 782 return -EPERM; 783 784 error = gfs2_rs_alloc(dip); 785 if (error) 786 return error; 787 788 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 789 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); 790 791 error = gfs2_glock_nq(ghs); /* parent */ 792 if (error) 793 goto out_parent; 794 795 error = gfs2_glock_nq(ghs + 1); /* child */ 796 if (error) 797 goto out_child; 798 799 error = -ENOENT; 800 if (inode->i_nlink == 0) 801 goto out_gunlock; 802 803 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC); 804 if (error) 805 goto out_gunlock; 806 807 error = gfs2_dir_check(dir, &dentry->d_name, NULL); 808 switch (error) { 809 case -ENOENT: 810 break; 811 case 0: 812 error = -EEXIST; 813 default: 814 goto out_gunlock; 815 } 816 817 error = -EINVAL; 818 if (!dip->i_inode.i_nlink) 819 goto out_gunlock; 820 error = -EFBIG; 821 if (dip->i_entries == (u32)-1) 822 goto out_gunlock; 823 error = -EPERM; 824 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 825 goto out_gunlock; 826 error = -EINVAL; 827 if (!ip->i_inode.i_nlink) 828 goto out_gunlock; 829 error = -EMLINK; 830 if (ip->i_inode.i_nlink == (u32)-1) 831 goto out_gunlock; 832 833 alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name); 834 if (error < 0) 835 goto out_gunlock; 836 error = 0; 837 838 if (alloc_required) { 839 error = gfs2_quota_lock_check(dip); 840 if (error) 841 goto out_gunlock; 842 843 error = gfs2_inplace_reserve(dip, sdp->sd_max_dirres, 0); 844 if (error) 845 goto out_gunlock_q; 846 847 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + 848 gfs2_rg_blocks(dip, sdp->sd_max_dirres) + 849 2 * RES_DINODE + RES_STATFS + 850 RES_QUOTA, 0); 851 if (error) 852 goto out_ipres; 853 } else { 854 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0); 855 if (error) 856 goto out_ipres; 857 } 858 859 error = gfs2_meta_inode_buffer(ip, &dibh); 860 if (error) 861 goto out_end_trans; 862 863 error = gfs2_dir_add(dir, &dentry->d_name, ip); 864 if (error) 865 goto out_brelse; 866 867 gfs2_trans_add_meta(ip->i_gl, dibh); 868 inc_nlink(&ip->i_inode); 869 ip->i_inode.i_ctime = CURRENT_TIME; 870 ihold(inode); 871 d_instantiate(dentry, inode); 872 mark_inode_dirty(inode); 873 874 out_brelse: 875 brelse(dibh); 876 out_end_trans: 877 gfs2_trans_end(sdp); 878 out_ipres: 879 if (alloc_required) 880 gfs2_inplace_release(dip); 881 out_gunlock_q: 882 if (alloc_required) 883 gfs2_quota_unlock(dip); 884 out_gunlock: 885 gfs2_glock_dq(ghs + 1); 886 out_child: 887 gfs2_glock_dq(ghs); 888 out_parent: 889 gfs2_holder_uninit(ghs); 890 gfs2_holder_uninit(ghs + 1); 891 return error; 892 } 893 894 /* 895 * gfs2_unlink_ok - check to see that a inode is still in a directory 896 * @dip: the directory 897 * @name: the name of the file 898 * @ip: the inode 899 * 900 * Assumes that the lock on (at least) @dip is held. 901 * 902 * Returns: 0 if the parent/child relationship is correct, errno if it isn't 903 */ 904 905 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, 906 const struct gfs2_inode *ip) 907 { 908 int error; 909 910 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) 911 return -EPERM; 912 913 if ((dip->i_inode.i_mode & S_ISVTX) && 914 !uid_eq(dip->i_inode.i_uid, current_fsuid()) && 915 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER)) 916 return -EPERM; 917 918 if (IS_APPEND(&dip->i_inode)) 919 return -EPERM; 920 921 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC); 922 if (error) 923 return error; 924 925 error = gfs2_dir_check(&dip->i_inode, name, ip); 926 if (error) 927 return error; 928 929 return 0; 930 } 931 932 /** 933 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it 934 * @dip: The parent directory 935 * @name: The name of the entry in the parent directory 936 * @inode: The inode to be removed 937 * 938 * Called with all the locks and in a transaction. This will only be 939 * called for a directory after it has been checked to ensure it is empty. 940 * 941 * Returns: 0 on success, or an error 942 */ 943 944 static int gfs2_unlink_inode(struct gfs2_inode *dip, 945 const struct dentry *dentry) 946 { 947 struct inode *inode = dentry->d_inode; 948 struct gfs2_inode *ip = GFS2_I(inode); 949 int error; 950 951 error = gfs2_dir_del(dip, dentry); 952 if (error) 953 return error; 954 955 ip->i_entries = 0; 956 inode->i_ctime = CURRENT_TIME; 957 if (S_ISDIR(inode->i_mode)) 958 clear_nlink(inode); 959 else 960 drop_nlink(inode); 961 mark_inode_dirty(inode); 962 if (inode->i_nlink == 0) 963 gfs2_unlink_di(inode); 964 return 0; 965 } 966 967 968 /** 969 * gfs2_unlink - Unlink an inode (this does rmdir as well) 970 * @dir: The inode of the directory containing the inode to unlink 971 * @dentry: The file itself 972 * 973 * This routine uses the type of the inode as a flag to figure out 974 * whether this is an unlink or an rmdir. 975 * 976 * Returns: errno 977 */ 978 979 static int gfs2_unlink(struct inode *dir, struct dentry *dentry) 980 { 981 struct gfs2_inode *dip = GFS2_I(dir); 982 struct gfs2_sbd *sdp = GFS2_SB(dir); 983 struct inode *inode = dentry->d_inode; 984 struct gfs2_inode *ip = GFS2_I(inode); 985 struct gfs2_holder ghs[3]; 986 struct gfs2_rgrpd *rgd; 987 int error; 988 989 error = gfs2_rindex_update(sdp); 990 if (error) 991 return error; 992 993 error = -EROFS; 994 995 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 996 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); 997 998 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1); 999 if (!rgd) 1000 goto out_inodes; 1001 1002 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2); 1003 1004 1005 error = gfs2_glock_nq(ghs); /* parent */ 1006 if (error) 1007 goto out_parent; 1008 1009 error = gfs2_glock_nq(ghs + 1); /* child */ 1010 if (error) 1011 goto out_child; 1012 1013 error = -ENOENT; 1014 if (inode->i_nlink == 0) 1015 goto out_rgrp; 1016 1017 if (S_ISDIR(inode->i_mode)) { 1018 error = -ENOTEMPTY; 1019 if (ip->i_entries > 2 || inode->i_nlink > 2) 1020 goto out_rgrp; 1021 } 1022 1023 error = gfs2_glock_nq(ghs + 2); /* rgrp */ 1024 if (error) 1025 goto out_rgrp; 1026 1027 error = gfs2_unlink_ok(dip, &dentry->d_name, ip); 1028 if (error) 1029 goto out_gunlock; 1030 1031 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0); 1032 if (error) 1033 goto out_end_trans; 1034 1035 error = gfs2_unlink_inode(dip, dentry); 1036 1037 out_end_trans: 1038 gfs2_trans_end(sdp); 1039 out_gunlock: 1040 gfs2_glock_dq(ghs + 2); 1041 out_rgrp: 1042 gfs2_glock_dq(ghs + 1); 1043 out_child: 1044 gfs2_glock_dq(ghs); 1045 out_parent: 1046 gfs2_holder_uninit(ghs + 2); 1047 out_inodes: 1048 gfs2_holder_uninit(ghs + 1); 1049 gfs2_holder_uninit(ghs); 1050 return error; 1051 } 1052 1053 /** 1054 * gfs2_symlink - Create a symlink 1055 * @dir: The directory to create the symlink in 1056 * @dentry: The dentry to put the symlink in 1057 * @symname: The thing which the link points to 1058 * 1059 * Returns: errno 1060 */ 1061 1062 static int gfs2_symlink(struct inode *dir, struct dentry *dentry, 1063 const char *symname) 1064 { 1065 struct gfs2_sbd *sdp = GFS2_SB(dir); 1066 unsigned int size; 1067 1068 size = strlen(symname); 1069 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1) 1070 return -ENAMETOOLONG; 1071 1072 return gfs2_create_inode(dir, dentry, S_IFLNK | S_IRWXUGO, 0, symname, size, 0); 1073 } 1074 1075 /** 1076 * gfs2_mkdir - Make a directory 1077 * @dir: The parent directory of the new one 1078 * @dentry: The dentry of the new directory 1079 * @mode: The mode of the new directory 1080 * 1081 * Returns: errno 1082 */ 1083 1084 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 1085 { 1086 struct gfs2_sbd *sdp = GFS2_SB(dir); 1087 unsigned dsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode); 1088 return gfs2_create_inode(dir, dentry, S_IFDIR | mode, 0, NULL, dsize, 0); 1089 } 1090 1091 /** 1092 * gfs2_mknod - Make a special file 1093 * @dir: The directory in which the special file will reside 1094 * @dentry: The dentry of the special file 1095 * @mode: The mode of the special file 1096 * @dev: The device specification of the special file 1097 * 1098 */ 1099 1100 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, 1101 dev_t dev) 1102 { 1103 return gfs2_create_inode(dir, dentry, mode, dev, NULL, 0, 0); 1104 } 1105 1106 /* 1107 * gfs2_ok_to_move - check if it's ok to move a directory to another directory 1108 * @this: move this 1109 * @to: to here 1110 * 1111 * Follow @to back to the root and make sure we don't encounter @this 1112 * Assumes we already hold the rename lock. 1113 * 1114 * Returns: errno 1115 */ 1116 1117 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) 1118 { 1119 struct inode *dir = &to->i_inode; 1120 struct super_block *sb = dir->i_sb; 1121 struct inode *tmp; 1122 int error = 0; 1123 1124 igrab(dir); 1125 1126 for (;;) { 1127 if (dir == &this->i_inode) { 1128 error = -EINVAL; 1129 break; 1130 } 1131 if (dir == sb->s_root->d_inode) { 1132 error = 0; 1133 break; 1134 } 1135 1136 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1); 1137 if (IS_ERR(tmp)) { 1138 error = PTR_ERR(tmp); 1139 break; 1140 } 1141 1142 iput(dir); 1143 dir = tmp; 1144 } 1145 1146 iput(dir); 1147 1148 return error; 1149 } 1150 1151 /** 1152 * gfs2_rename - Rename a file 1153 * @odir: Parent directory of old file name 1154 * @odentry: The old dentry of the file 1155 * @ndir: Parent directory of new file name 1156 * @ndentry: The new dentry of the file 1157 * 1158 * Returns: errno 1159 */ 1160 1161 static int gfs2_rename(struct inode *odir, struct dentry *odentry, 1162 struct inode *ndir, struct dentry *ndentry) 1163 { 1164 struct gfs2_inode *odip = GFS2_I(odir); 1165 struct gfs2_inode *ndip = GFS2_I(ndir); 1166 struct gfs2_inode *ip = GFS2_I(odentry->d_inode); 1167 struct gfs2_inode *nip = NULL; 1168 struct gfs2_sbd *sdp = GFS2_SB(odir); 1169 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, }; 1170 struct gfs2_rgrpd *nrgd; 1171 unsigned int num_gh; 1172 int dir_rename = 0; 1173 int alloc_required = 0; 1174 unsigned int x; 1175 int error; 1176 1177 if (ndentry->d_inode) { 1178 nip = GFS2_I(ndentry->d_inode); 1179 if (ip == nip) 1180 return 0; 1181 } 1182 1183 error = gfs2_rindex_update(sdp); 1184 if (error) 1185 return error; 1186 1187 error = gfs2_rs_alloc(ndip); 1188 if (error) 1189 return error; 1190 1191 if (odip != ndip) { 1192 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 1193 0, &r_gh); 1194 if (error) 1195 goto out; 1196 1197 if (S_ISDIR(ip->i_inode.i_mode)) { 1198 dir_rename = 1; 1199 /* don't move a dirctory into it's subdir */ 1200 error = gfs2_ok_to_move(ip, ndip); 1201 if (error) 1202 goto out_gunlock_r; 1203 } 1204 } 1205 1206 num_gh = 1; 1207 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 1208 if (odip != ndip) { 1209 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1210 num_gh++; 1211 } 1212 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1213 num_gh++; 1214 1215 if (nip) { 1216 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1217 num_gh++; 1218 /* grab the resource lock for unlink flag twiddling 1219 * this is the case of the target file already existing 1220 * so we unlink before doing the rename 1221 */ 1222 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1); 1223 if (nrgd) 1224 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++); 1225 } 1226 1227 for (x = 0; x < num_gh; x++) { 1228 error = gfs2_glock_nq(ghs + x); 1229 if (error) 1230 goto out_gunlock; 1231 } 1232 1233 error = -ENOENT; 1234 if (ip->i_inode.i_nlink == 0) 1235 goto out_gunlock; 1236 1237 /* Check out the old directory */ 1238 1239 error = gfs2_unlink_ok(odip, &odentry->d_name, ip); 1240 if (error) 1241 goto out_gunlock; 1242 1243 /* Check out the new directory */ 1244 1245 if (nip) { 1246 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); 1247 if (error) 1248 goto out_gunlock; 1249 1250 if (nip->i_inode.i_nlink == 0) { 1251 error = -EAGAIN; 1252 goto out_gunlock; 1253 } 1254 1255 if (S_ISDIR(nip->i_inode.i_mode)) { 1256 if (nip->i_entries < 2) { 1257 gfs2_consist_inode(nip); 1258 error = -EIO; 1259 goto out_gunlock; 1260 } 1261 if (nip->i_entries > 2) { 1262 error = -ENOTEMPTY; 1263 goto out_gunlock; 1264 } 1265 } 1266 } else { 1267 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC); 1268 if (error) 1269 goto out_gunlock; 1270 1271 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL); 1272 switch (error) { 1273 case -ENOENT: 1274 error = 0; 1275 break; 1276 case 0: 1277 error = -EEXIST; 1278 default: 1279 goto out_gunlock; 1280 }; 1281 1282 if (odip != ndip) { 1283 if (!ndip->i_inode.i_nlink) { 1284 error = -ENOENT; 1285 goto out_gunlock; 1286 } 1287 if (ndip->i_entries == (u32)-1) { 1288 error = -EFBIG; 1289 goto out_gunlock; 1290 } 1291 if (S_ISDIR(ip->i_inode.i_mode) && 1292 ndip->i_inode.i_nlink == (u32)-1) { 1293 error = -EMLINK; 1294 goto out_gunlock; 1295 } 1296 } 1297 } 1298 1299 /* Check out the dir to be renamed */ 1300 1301 if (dir_rename) { 1302 error = gfs2_permission(odentry->d_inode, MAY_WRITE); 1303 if (error) 1304 goto out_gunlock; 1305 } 1306 1307 if (nip == NULL) 1308 alloc_required = gfs2_diradd_alloc_required(ndir, &ndentry->d_name); 1309 error = alloc_required; 1310 if (error < 0) 1311 goto out_gunlock; 1312 1313 if (alloc_required) { 1314 error = gfs2_quota_lock_check(ndip); 1315 if (error) 1316 goto out_gunlock; 1317 1318 error = gfs2_inplace_reserve(ndip, sdp->sd_max_dirres, 0); 1319 if (error) 1320 goto out_gunlock_q; 1321 1322 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + 1323 gfs2_rg_blocks(ndip, sdp->sd_max_dirres) + 1324 4 * RES_DINODE + 4 * RES_LEAF + 1325 RES_STATFS + RES_QUOTA + 4, 0); 1326 if (error) 1327 goto out_ipreserv; 1328 } else { 1329 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 1330 5 * RES_LEAF + 4, 0); 1331 if (error) 1332 goto out_gunlock; 1333 } 1334 1335 /* Remove the target file, if it exists */ 1336 1337 if (nip) 1338 error = gfs2_unlink_inode(ndip, ndentry); 1339 1340 if (dir_rename) { 1341 error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR); 1342 if (error) 1343 goto out_end_trans; 1344 } else { 1345 struct buffer_head *dibh; 1346 error = gfs2_meta_inode_buffer(ip, &dibh); 1347 if (error) 1348 goto out_end_trans; 1349 ip->i_inode.i_ctime = CURRENT_TIME; 1350 gfs2_trans_add_meta(ip->i_gl, dibh); 1351 gfs2_dinode_out(ip, dibh->b_data); 1352 brelse(dibh); 1353 } 1354 1355 error = gfs2_dir_del(odip, odentry); 1356 if (error) 1357 goto out_end_trans; 1358 1359 error = gfs2_dir_add(ndir, &ndentry->d_name, ip); 1360 if (error) 1361 goto out_end_trans; 1362 1363 out_end_trans: 1364 gfs2_trans_end(sdp); 1365 out_ipreserv: 1366 if (alloc_required) 1367 gfs2_inplace_release(ndip); 1368 out_gunlock_q: 1369 if (alloc_required) 1370 gfs2_quota_unlock(ndip); 1371 out_gunlock: 1372 while (x--) { 1373 gfs2_glock_dq(ghs + x); 1374 gfs2_holder_uninit(ghs + x); 1375 } 1376 out_gunlock_r: 1377 if (r_gh.gh_gl) 1378 gfs2_glock_dq_uninit(&r_gh); 1379 out: 1380 return error; 1381 } 1382 1383 /** 1384 * gfs2_follow_link - Follow a symbolic link 1385 * @dentry: The dentry of the link 1386 * @nd: Data that we pass to vfs_follow_link() 1387 * 1388 * This can handle symlinks of any size. 1389 * 1390 * Returns: 0 on success or error code 1391 */ 1392 1393 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd) 1394 { 1395 struct gfs2_inode *ip = GFS2_I(dentry->d_inode); 1396 struct gfs2_holder i_gh; 1397 struct buffer_head *dibh; 1398 unsigned int size; 1399 char *buf; 1400 int error; 1401 1402 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); 1403 error = gfs2_glock_nq(&i_gh); 1404 if (error) { 1405 gfs2_holder_uninit(&i_gh); 1406 nd_set_link(nd, ERR_PTR(error)); 1407 return NULL; 1408 } 1409 1410 size = (unsigned int)i_size_read(&ip->i_inode); 1411 if (size == 0) { 1412 gfs2_consist_inode(ip); 1413 buf = ERR_PTR(-EIO); 1414 goto out; 1415 } 1416 1417 error = gfs2_meta_inode_buffer(ip, &dibh); 1418 if (error) { 1419 buf = ERR_PTR(error); 1420 goto out; 1421 } 1422 1423 buf = kzalloc(size + 1, GFP_NOFS); 1424 if (!buf) 1425 buf = ERR_PTR(-ENOMEM); 1426 else 1427 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size); 1428 brelse(dibh); 1429 out: 1430 gfs2_glock_dq_uninit(&i_gh); 1431 nd_set_link(nd, buf); 1432 return NULL; 1433 } 1434 1435 static void gfs2_put_link(struct dentry *dentry, struct nameidata *nd, void *p) 1436 { 1437 char *s = nd_get_link(nd); 1438 if (!IS_ERR(s)) 1439 kfree(s); 1440 } 1441 1442 /** 1443 * gfs2_permission - 1444 * @inode: The inode 1445 * @mask: The mask to be tested 1446 * @flags: Indicates whether this is an RCU path walk or not 1447 * 1448 * This may be called from the VFS directly, or from within GFS2 with the 1449 * inode locked, so we look to see if the glock is already locked and only 1450 * lock the glock if its not already been done. 1451 * 1452 * Returns: errno 1453 */ 1454 1455 int gfs2_permission(struct inode *inode, int mask) 1456 { 1457 struct gfs2_inode *ip; 1458 struct gfs2_holder i_gh; 1459 int error; 1460 int unlock = 0; 1461 1462 1463 ip = GFS2_I(inode); 1464 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 1465 if (mask & MAY_NOT_BLOCK) 1466 return -ECHILD; 1467 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); 1468 if (error) 1469 return error; 1470 unlock = 1; 1471 } 1472 1473 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode)) 1474 error = -EACCES; 1475 else 1476 error = generic_permission(inode, mask); 1477 if (unlock) 1478 gfs2_glock_dq_uninit(&i_gh); 1479 1480 return error; 1481 } 1482 1483 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1484 { 1485 setattr_copy(inode, attr); 1486 mark_inode_dirty(inode); 1487 return 0; 1488 } 1489 1490 /** 1491 * gfs2_setattr_simple - 1492 * @ip: 1493 * @attr: 1494 * 1495 * Returns: errno 1496 */ 1497 1498 int gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1499 { 1500 int error; 1501 1502 if (current->journal_info) 1503 return __gfs2_setattr_simple(inode, attr); 1504 1505 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0); 1506 if (error) 1507 return error; 1508 1509 error = __gfs2_setattr_simple(inode, attr); 1510 gfs2_trans_end(GFS2_SB(inode)); 1511 return error; 1512 } 1513 1514 static int setattr_chown(struct inode *inode, struct iattr *attr) 1515 { 1516 struct gfs2_inode *ip = GFS2_I(inode); 1517 struct gfs2_sbd *sdp = GFS2_SB(inode); 1518 kuid_t ouid, nuid; 1519 kgid_t ogid, ngid; 1520 int error; 1521 1522 ouid = inode->i_uid; 1523 ogid = inode->i_gid; 1524 nuid = attr->ia_uid; 1525 ngid = attr->ia_gid; 1526 1527 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid)) 1528 ouid = nuid = NO_UID_QUOTA_CHANGE; 1529 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid)) 1530 ogid = ngid = NO_GID_QUOTA_CHANGE; 1531 1532 error = gfs2_quota_lock(ip, nuid, ngid); 1533 if (error) 1534 return error; 1535 1536 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 1537 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 1538 error = gfs2_quota_check(ip, nuid, ngid); 1539 if (error) 1540 goto out_gunlock_q; 1541 } 1542 1543 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0); 1544 if (error) 1545 goto out_gunlock_q; 1546 1547 error = gfs2_setattr_simple(inode, attr); 1548 if (error) 1549 goto out_end_trans; 1550 1551 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 1552 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 1553 u64 blocks = gfs2_get_inode_blocks(&ip->i_inode); 1554 gfs2_quota_change(ip, -blocks, ouid, ogid); 1555 gfs2_quota_change(ip, blocks, nuid, ngid); 1556 } 1557 1558 out_end_trans: 1559 gfs2_trans_end(sdp); 1560 out_gunlock_q: 1561 gfs2_quota_unlock(ip); 1562 return error; 1563 } 1564 1565 /** 1566 * gfs2_setattr - Change attributes on an inode 1567 * @dentry: The dentry which is changing 1568 * @attr: The structure describing the change 1569 * 1570 * The VFS layer wants to change one or more of an inodes attributes. Write 1571 * that change out to disk. 1572 * 1573 * Returns: errno 1574 */ 1575 1576 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr) 1577 { 1578 struct inode *inode = dentry->d_inode; 1579 struct gfs2_inode *ip = GFS2_I(inode); 1580 struct gfs2_holder i_gh; 1581 int error; 1582 1583 error = gfs2_rs_alloc(ip); 1584 if (error) 1585 return error; 1586 1587 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); 1588 if (error) 1589 return error; 1590 1591 error = -EPERM; 1592 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 1593 goto out; 1594 1595 error = inode_change_ok(inode, attr); 1596 if (error) 1597 goto out; 1598 1599 if (attr->ia_valid & ATTR_SIZE) 1600 error = gfs2_setattr_size(inode, attr->ia_size); 1601 else if (attr->ia_valid & (ATTR_UID | ATTR_GID)) 1602 error = setattr_chown(inode, attr); 1603 else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode)) 1604 error = gfs2_acl_chmod(ip, attr); 1605 else 1606 error = gfs2_setattr_simple(inode, attr); 1607 1608 out: 1609 if (!error) 1610 mark_inode_dirty(inode); 1611 gfs2_glock_dq_uninit(&i_gh); 1612 return error; 1613 } 1614 1615 /** 1616 * gfs2_getattr - Read out an inode's attributes 1617 * @mnt: The vfsmount the inode is being accessed from 1618 * @dentry: The dentry to stat 1619 * @stat: The inode's stats 1620 * 1621 * This may be called from the VFS directly, or from within GFS2 with the 1622 * inode locked, so we look to see if the glock is already locked and only 1623 * lock the glock if its not already been done. Note that its the NFS 1624 * readdirplus operation which causes this to be called (from filldir) 1625 * with the glock already held. 1626 * 1627 * Returns: errno 1628 */ 1629 1630 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry, 1631 struct kstat *stat) 1632 { 1633 struct inode *inode = dentry->d_inode; 1634 struct gfs2_inode *ip = GFS2_I(inode); 1635 struct gfs2_holder gh; 1636 int error; 1637 int unlock = 0; 1638 1639 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 1640 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 1641 if (error) 1642 return error; 1643 unlock = 1; 1644 } 1645 1646 generic_fillattr(inode, stat); 1647 if (unlock) 1648 gfs2_glock_dq_uninit(&gh); 1649 1650 return 0; 1651 } 1652 1653 static int gfs2_setxattr(struct dentry *dentry, const char *name, 1654 const void *data, size_t size, int flags) 1655 { 1656 struct inode *inode = dentry->d_inode; 1657 struct gfs2_inode *ip = GFS2_I(inode); 1658 struct gfs2_holder gh; 1659 int ret; 1660 1661 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 1662 ret = gfs2_glock_nq(&gh); 1663 if (ret == 0) { 1664 ret = gfs2_rs_alloc(ip); 1665 if (ret == 0) 1666 ret = generic_setxattr(dentry, name, data, size, flags); 1667 gfs2_glock_dq(&gh); 1668 } 1669 gfs2_holder_uninit(&gh); 1670 return ret; 1671 } 1672 1673 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name, 1674 void *data, size_t size) 1675 { 1676 struct inode *inode = dentry->d_inode; 1677 struct gfs2_inode *ip = GFS2_I(inode); 1678 struct gfs2_holder gh; 1679 int ret; 1680 1681 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 1682 ret = gfs2_glock_nq(&gh); 1683 if (ret == 0) { 1684 ret = generic_getxattr(dentry, name, data, size); 1685 gfs2_glock_dq(&gh); 1686 } 1687 gfs2_holder_uninit(&gh); 1688 return ret; 1689 } 1690 1691 static int gfs2_removexattr(struct dentry *dentry, const char *name) 1692 { 1693 struct inode *inode = dentry->d_inode; 1694 struct gfs2_inode *ip = GFS2_I(inode); 1695 struct gfs2_holder gh; 1696 int ret; 1697 1698 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 1699 ret = gfs2_glock_nq(&gh); 1700 if (ret == 0) { 1701 ret = gfs2_rs_alloc(ip); 1702 if (ret == 0) 1703 ret = generic_removexattr(dentry, name); 1704 gfs2_glock_dq(&gh); 1705 } 1706 gfs2_holder_uninit(&gh); 1707 return ret; 1708 } 1709 1710 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 1711 u64 start, u64 len) 1712 { 1713 struct gfs2_inode *ip = GFS2_I(inode); 1714 struct gfs2_holder gh; 1715 int ret; 1716 1717 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC); 1718 if (ret) 1719 return ret; 1720 1721 mutex_lock(&inode->i_mutex); 1722 1723 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 1724 if (ret) 1725 goto out; 1726 1727 if (gfs2_is_stuffed(ip)) { 1728 u64 phys = ip->i_no_addr << inode->i_blkbits; 1729 u64 size = i_size_read(inode); 1730 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED| 1731 FIEMAP_EXTENT_DATA_INLINE; 1732 phys += sizeof(struct gfs2_dinode); 1733 phys += start; 1734 if (start + len > size) 1735 len = size - start; 1736 if (start < size) 1737 ret = fiemap_fill_next_extent(fieinfo, start, phys, 1738 len, flags); 1739 if (ret == 1) 1740 ret = 0; 1741 } else { 1742 ret = __generic_block_fiemap(inode, fieinfo, start, len, 1743 gfs2_block_map); 1744 } 1745 1746 gfs2_glock_dq_uninit(&gh); 1747 out: 1748 mutex_unlock(&inode->i_mutex); 1749 return ret; 1750 } 1751 1752 const struct inode_operations gfs2_file_iops = { 1753 .permission = gfs2_permission, 1754 .setattr = gfs2_setattr, 1755 .getattr = gfs2_getattr, 1756 .setxattr = gfs2_setxattr, 1757 .getxattr = gfs2_getxattr, 1758 .listxattr = gfs2_listxattr, 1759 .removexattr = gfs2_removexattr, 1760 .fiemap = gfs2_fiemap, 1761 .get_acl = gfs2_get_acl, 1762 }; 1763 1764 const struct inode_operations gfs2_dir_iops = { 1765 .create = gfs2_create, 1766 .lookup = gfs2_lookup, 1767 .link = gfs2_link, 1768 .unlink = gfs2_unlink, 1769 .symlink = gfs2_symlink, 1770 .mkdir = gfs2_mkdir, 1771 .rmdir = gfs2_unlink, 1772 .mknod = gfs2_mknod, 1773 .rename = gfs2_rename, 1774 .permission = gfs2_permission, 1775 .setattr = gfs2_setattr, 1776 .getattr = gfs2_getattr, 1777 .setxattr = gfs2_setxattr, 1778 .getxattr = gfs2_getxattr, 1779 .listxattr = gfs2_listxattr, 1780 .removexattr = gfs2_removexattr, 1781 .fiemap = gfs2_fiemap, 1782 .get_acl = gfs2_get_acl, 1783 }; 1784 1785 const struct inode_operations gfs2_symlink_iops = { 1786 .readlink = generic_readlink, 1787 .follow_link = gfs2_follow_link, 1788 .put_link = gfs2_put_link, 1789 .permission = gfs2_permission, 1790 .setattr = gfs2_setattr, 1791 .getattr = gfs2_getattr, 1792 .setxattr = gfs2_setxattr, 1793 .getxattr = gfs2_getxattr, 1794 .listxattr = gfs2_listxattr, 1795 .removexattr = gfs2_removexattr, 1796 .fiemap = gfs2_fiemap, 1797 .get_acl = gfs2_get_acl, 1798 }; 1799 1800