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 struct gfs2_alloc_parms ap = { .target = RES_DINODE, .aflags = flags, }; 383 int error; 384 int dblocks = 1; 385 386 error = gfs2_quota_lock_check(ip); 387 if (error) 388 goto out; 389 390 error = gfs2_inplace_reserve(ip, &ap); 391 if (error) 392 goto out_quota; 393 394 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 0); 395 if (error) 396 goto out_ipreserv; 397 398 error = gfs2_alloc_blocks(ip, &ip->i_no_addr, &dblocks, 1, &ip->i_generation); 399 ip->i_no_formal_ino = ip->i_generation; 400 ip->i_inode.i_ino = ip->i_no_addr; 401 ip->i_goal = ip->i_no_addr; 402 403 gfs2_trans_end(sdp); 404 405 out_ipreserv: 406 gfs2_inplace_release(ip); 407 out_quota: 408 gfs2_quota_unlock(ip); 409 out: 410 return error; 411 } 412 413 static void gfs2_init_dir(struct buffer_head *dibh, 414 const struct gfs2_inode *parent) 415 { 416 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data; 417 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1); 418 419 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent); 420 dent->de_inum = di->di_num; /* already GFS2 endian */ 421 dent->de_type = cpu_to_be16(DT_DIR); 422 423 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1)); 424 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent); 425 gfs2_inum_out(parent, dent); 426 dent->de_type = cpu_to_be16(DT_DIR); 427 428 } 429 430 /** 431 * init_dinode - Fill in a new dinode structure 432 * @dip: The directory this inode is being created in 433 * @ip: The inode 434 * @symname: The symlink destination (if a symlink) 435 * @bhp: The buffer head (returned to caller) 436 * 437 */ 438 439 static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip, 440 const char *symname) 441 { 442 struct gfs2_dinode *di; 443 struct buffer_head *dibh; 444 445 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr); 446 gfs2_trans_add_meta(ip->i_gl, dibh); 447 di = (struct gfs2_dinode *)dibh->b_data; 448 gfs2_dinode_out(ip, di); 449 450 di->di_major = cpu_to_be32(MAJOR(ip->i_inode.i_rdev)); 451 di->di_minor = cpu_to_be32(MINOR(ip->i_inode.i_rdev)); 452 di->__pad1 = 0; 453 di->__pad2 = 0; 454 di->__pad3 = 0; 455 memset(&di->__pad4, 0, sizeof(di->__pad4)); 456 memset(&di->di_reserved, 0, sizeof(di->di_reserved)); 457 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); 458 459 switch(ip->i_inode.i_mode & S_IFMT) { 460 case S_IFDIR: 461 gfs2_init_dir(dibh, dip); 462 break; 463 case S_IFLNK: 464 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size); 465 break; 466 } 467 468 set_buffer_uptodate(dibh); 469 brelse(dibh); 470 } 471 472 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, 473 struct gfs2_inode *ip, struct gfs2_diradd *da) 474 { 475 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 476 struct gfs2_alloc_parms ap = { .target = da->nr_blocks, }; 477 int error; 478 479 if (da->nr_blocks) { 480 error = gfs2_quota_lock_check(dip); 481 if (error) 482 goto fail_quota_locks; 483 484 error = gfs2_inplace_reserve(dip, &ap); 485 if (error) 486 goto fail_quota_locks; 487 488 error = gfs2_trans_begin(sdp, da->nr_blocks + 489 gfs2_rg_blocks(dip, da->nr_blocks) + 490 2 * RES_DINODE + 491 RES_STATFS + RES_QUOTA, 0); 492 if (error) 493 goto fail_ipreserv; 494 } else { 495 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); 496 if (error) 497 goto fail_quota_locks; 498 } 499 500 error = gfs2_dir_add(&dip->i_inode, name, ip); 501 if (error) 502 goto fail_end_trans; 503 504 fail_end_trans: 505 gfs2_trans_end(sdp); 506 fail_ipreserv: 507 gfs2_inplace_release(dip); 508 fail_quota_locks: 509 gfs2_quota_unlock(dip); 510 return error; 511 } 512 513 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array, 514 void *fs_info) 515 { 516 const struct xattr *xattr; 517 int err = 0; 518 519 for (xattr = xattr_array; xattr->name != NULL; xattr++) { 520 err = __gfs2_xattr_set(inode, xattr->name, xattr->value, 521 xattr->value_len, 0, 522 GFS2_EATYPE_SECURITY); 523 if (err < 0) 524 break; 525 } 526 return err; 527 } 528 529 static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip, 530 const struct qstr *qstr) 531 { 532 return security_inode_init_security(&ip->i_inode, &dip->i_inode, qstr, 533 &gfs2_initxattrs, NULL); 534 } 535 536 /** 537 * gfs2_create_inode - Create a new inode 538 * @dir: The parent directory 539 * @dentry: The new dentry 540 * @file: If non-NULL, the file which is being opened 541 * @mode: The permissions on the new inode 542 * @dev: For device nodes, this is the device number 543 * @symname: For symlinks, this is the link destination 544 * @size: The initial size of the inode (ignored for directories) 545 * 546 * Returns: 0 on success, or error code 547 */ 548 549 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry, 550 struct file *file, 551 umode_t mode, dev_t dev, const char *symname, 552 unsigned int size, int excl, int *opened) 553 { 554 const struct qstr *name = &dentry->d_name; 555 struct gfs2_holder ghs[2]; 556 struct inode *inode = NULL; 557 struct gfs2_inode *dip = GFS2_I(dir), *ip; 558 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 559 struct gfs2_glock *io_gl; 560 struct dentry *d; 561 int error; 562 u32 aflags = 0; 563 struct gfs2_diradd da; 564 565 if (!name->len || name->len > GFS2_FNAMESIZE) 566 return -ENAMETOOLONG; 567 568 error = gfs2_rs_alloc(dip); 569 if (error) 570 return error; 571 572 error = gfs2_rindex_update(sdp); 573 if (error) 574 return error; 575 576 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 577 if (error) 578 goto fail; 579 580 error = create_ok(dip, name, mode); 581 if (error) 582 goto fail_gunlock; 583 584 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl); 585 error = PTR_ERR(inode); 586 if (!IS_ERR(inode)) { 587 d = d_splice_alias(inode, dentry); 588 error = 0; 589 if (file) { 590 if (S_ISREG(inode->i_mode)) { 591 WARN_ON(d != NULL); 592 error = finish_open(file, dentry, gfs2_open_common, opened); 593 } else { 594 error = finish_no_open(file, d); 595 } 596 } else { 597 dput(d); 598 } 599 gfs2_glock_dq_uninit(ghs); 600 return error; 601 } else if (error != -ENOENT) { 602 goto fail_gunlock; 603 } 604 605 error = gfs2_diradd_alloc_required(dir, name, &da); 606 if (error < 0) 607 goto fail_gunlock; 608 609 inode = new_inode(sdp->sd_vfs); 610 error = -ENOMEM; 611 if (!inode) 612 goto fail_gunlock; 613 614 ip = GFS2_I(inode); 615 error = gfs2_rs_alloc(ip); 616 if (error) 617 goto fail_free_inode; 618 619 inode->i_mode = mode; 620 set_nlink(inode, S_ISDIR(mode) ? 2 : 1); 621 inode->i_rdev = dev; 622 inode->i_size = size; 623 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 624 gfs2_set_inode_blocks(inode, 1); 625 munge_mode_uid_gid(dip, inode); 626 ip->i_goal = dip->i_goal; 627 ip->i_diskflags = 0; 628 ip->i_eattr = 0; 629 ip->i_height = 0; 630 ip->i_depth = 0; 631 ip->i_entries = 0; 632 633 switch(mode & S_IFMT) { 634 case S_IFREG: 635 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) || 636 gfs2_tune_get(sdp, gt_new_files_jdata)) 637 ip->i_diskflags |= GFS2_DIF_JDATA; 638 gfs2_set_aops(inode); 639 break; 640 case S_IFDIR: 641 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA); 642 ip->i_diskflags |= GFS2_DIF_JDATA; 643 ip->i_entries = 2; 644 break; 645 } 646 gfs2_set_inode_flags(inode); 647 648 if ((GFS2_I(sdp->sd_root_dir->d_inode) == dip) || 649 (dip->i_diskflags & GFS2_DIF_TOPDIR)) 650 aflags |= GFS2_AF_ORLOV; 651 652 error = alloc_dinode(ip, aflags); 653 if (error) 654 goto fail_free_inode; 655 656 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); 657 if (error) 658 goto fail_free_inode; 659 660 ip->i_gl->gl_object = ip; 661 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1); 662 if (error) 663 goto fail_free_inode; 664 665 error = gfs2_trans_begin(sdp, RES_DINODE, 0); 666 if (error) 667 goto fail_gunlock2; 668 669 init_dinode(dip, ip, symname); 670 gfs2_trans_end(sdp); 671 672 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl); 673 if (error) 674 goto fail_gunlock2; 675 676 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); 677 if (error) 678 goto fail_gunlock2; 679 680 ip->i_iopen_gh.gh_gl->gl_object = ip; 681 gfs2_glock_put(io_gl); 682 gfs2_set_iop(inode); 683 insert_inode_hash(inode); 684 685 error = gfs2_acl_create(dip, inode); 686 if (error) 687 goto fail_gunlock3; 688 689 error = gfs2_security_init(dip, ip, name); 690 if (error) 691 goto fail_gunlock3; 692 693 error = link_dinode(dip, name, ip, &da); 694 if (error) 695 goto fail_gunlock3; 696 697 mark_inode_dirty(inode); 698 d_instantiate(dentry, inode); 699 if (file) { 700 *opened |= FILE_CREATED; 701 error = finish_open(file, dentry, gfs2_open_common, opened); 702 } 703 gfs2_glock_dq_uninit(ghs); 704 gfs2_glock_dq_uninit(ghs + 1); 705 return error; 706 707 fail_gunlock3: 708 gfs2_glock_dq_uninit(ghs + 1); 709 if (ip->i_gl) 710 gfs2_glock_put(ip->i_gl); 711 goto fail_gunlock; 712 713 fail_gunlock2: 714 gfs2_glock_dq_uninit(ghs + 1); 715 fail_free_inode: 716 if (ip->i_gl) 717 gfs2_glock_put(ip->i_gl); 718 gfs2_rs_delete(ip, NULL); 719 free_inode_nonrcu(inode); 720 inode = NULL; 721 fail_gunlock: 722 gfs2_glock_dq_uninit(ghs); 723 if (inode && !IS_ERR(inode)) { 724 clear_nlink(inode); 725 mark_inode_dirty(inode); 726 set_bit(GIF_ALLOC_FAILED, &GFS2_I(inode)->i_flags); 727 iput(inode); 728 } 729 fail: 730 return error; 731 } 732 733 /** 734 * gfs2_create - Create a file 735 * @dir: The directory in which to create the file 736 * @dentry: The dentry of the new file 737 * @mode: The mode of the new file 738 * 739 * Returns: errno 740 */ 741 742 static int gfs2_create(struct inode *dir, struct dentry *dentry, 743 umode_t mode, bool excl) 744 { 745 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl, NULL); 746 } 747 748 /** 749 * __gfs2_lookup - Look up a filename in a directory and return its inode 750 * @dir: The directory inode 751 * @dentry: The dentry of the new inode 752 * @file: File to be opened 753 * @opened: atomic_open flags 754 * 755 * 756 * Returns: errno 757 */ 758 759 static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry, 760 struct file *file, int *opened) 761 { 762 struct inode *inode; 763 struct dentry *d; 764 struct gfs2_holder gh; 765 struct gfs2_glock *gl; 766 int error; 767 768 inode = gfs2_lookupi(dir, &dentry->d_name, 0); 769 if (!inode) 770 return NULL; 771 if (IS_ERR(inode)) 772 return ERR_CAST(inode); 773 774 gl = GFS2_I(inode)->i_gl; 775 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 776 if (error) { 777 iput(inode); 778 return ERR_PTR(error); 779 } 780 781 d = d_splice_alias(inode, dentry); 782 if (file && S_ISREG(inode->i_mode)) 783 error = finish_open(file, dentry, gfs2_open_common, opened); 784 785 gfs2_glock_dq_uninit(&gh); 786 if (error) { 787 dput(d); 788 return ERR_PTR(error); 789 } 790 return d; 791 } 792 793 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry, 794 unsigned flags) 795 { 796 return __gfs2_lookup(dir, dentry, NULL, NULL); 797 } 798 799 /** 800 * gfs2_link - Link to a file 801 * @old_dentry: The inode to link 802 * @dir: Add link to this directory 803 * @dentry: The name of the link 804 * 805 * Link the inode in "old_dentry" into the directory "dir" with the 806 * name in "dentry". 807 * 808 * Returns: errno 809 */ 810 811 static int gfs2_link(struct dentry *old_dentry, struct inode *dir, 812 struct dentry *dentry) 813 { 814 struct gfs2_inode *dip = GFS2_I(dir); 815 struct gfs2_sbd *sdp = GFS2_SB(dir); 816 struct inode *inode = old_dentry->d_inode; 817 struct gfs2_inode *ip = GFS2_I(inode); 818 struct gfs2_holder ghs[2]; 819 struct buffer_head *dibh; 820 struct gfs2_diradd da; 821 int error; 822 823 if (S_ISDIR(inode->i_mode)) 824 return -EPERM; 825 826 error = gfs2_rs_alloc(dip); 827 if (error) 828 return error; 829 830 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 831 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); 832 833 error = gfs2_glock_nq(ghs); /* parent */ 834 if (error) 835 goto out_parent; 836 837 error = gfs2_glock_nq(ghs + 1); /* child */ 838 if (error) 839 goto out_child; 840 841 error = -ENOENT; 842 if (inode->i_nlink == 0) 843 goto out_gunlock; 844 845 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC); 846 if (error) 847 goto out_gunlock; 848 849 error = gfs2_dir_check(dir, &dentry->d_name, NULL); 850 switch (error) { 851 case -ENOENT: 852 break; 853 case 0: 854 error = -EEXIST; 855 default: 856 goto out_gunlock; 857 } 858 859 error = -EINVAL; 860 if (!dip->i_inode.i_nlink) 861 goto out_gunlock; 862 error = -EFBIG; 863 if (dip->i_entries == (u32)-1) 864 goto out_gunlock; 865 error = -EPERM; 866 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 867 goto out_gunlock; 868 error = -EINVAL; 869 if (!ip->i_inode.i_nlink) 870 goto out_gunlock; 871 error = -EMLINK; 872 if (ip->i_inode.i_nlink == (u32)-1) 873 goto out_gunlock; 874 875 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da); 876 if (error < 0) 877 goto out_gunlock; 878 879 if (da.nr_blocks) { 880 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, }; 881 error = gfs2_quota_lock_check(dip); 882 if (error) 883 goto out_gunlock; 884 885 error = gfs2_inplace_reserve(dip, &ap); 886 if (error) 887 goto out_gunlock_q; 888 889 error = gfs2_trans_begin(sdp, da.nr_blocks + 890 gfs2_rg_blocks(dip, da.nr_blocks) + 891 2 * RES_DINODE + RES_STATFS + 892 RES_QUOTA, 0); 893 if (error) 894 goto out_ipres; 895 } else { 896 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0); 897 if (error) 898 goto out_ipres; 899 } 900 901 error = gfs2_meta_inode_buffer(ip, &dibh); 902 if (error) 903 goto out_end_trans; 904 905 error = gfs2_dir_add(dir, &dentry->d_name, ip); 906 if (error) 907 goto out_brelse; 908 909 gfs2_trans_add_meta(ip->i_gl, dibh); 910 inc_nlink(&ip->i_inode); 911 ip->i_inode.i_ctime = CURRENT_TIME; 912 ihold(inode); 913 d_instantiate(dentry, inode); 914 mark_inode_dirty(inode); 915 916 out_brelse: 917 brelse(dibh); 918 out_end_trans: 919 gfs2_trans_end(sdp); 920 out_ipres: 921 if (da.nr_blocks) 922 gfs2_inplace_release(dip); 923 out_gunlock_q: 924 if (da.nr_blocks) 925 gfs2_quota_unlock(dip); 926 out_gunlock: 927 gfs2_glock_dq(ghs + 1); 928 out_child: 929 gfs2_glock_dq(ghs); 930 out_parent: 931 gfs2_holder_uninit(ghs); 932 gfs2_holder_uninit(ghs + 1); 933 return error; 934 } 935 936 /* 937 * gfs2_unlink_ok - check to see that a inode is still in a directory 938 * @dip: the directory 939 * @name: the name of the file 940 * @ip: the inode 941 * 942 * Assumes that the lock on (at least) @dip is held. 943 * 944 * Returns: 0 if the parent/child relationship is correct, errno if it isn't 945 */ 946 947 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, 948 const struct gfs2_inode *ip) 949 { 950 int error; 951 952 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) 953 return -EPERM; 954 955 if ((dip->i_inode.i_mode & S_ISVTX) && 956 !uid_eq(dip->i_inode.i_uid, current_fsuid()) && 957 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER)) 958 return -EPERM; 959 960 if (IS_APPEND(&dip->i_inode)) 961 return -EPERM; 962 963 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC); 964 if (error) 965 return error; 966 967 error = gfs2_dir_check(&dip->i_inode, name, ip); 968 if (error) 969 return error; 970 971 return 0; 972 } 973 974 /** 975 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it 976 * @dip: The parent directory 977 * @name: The name of the entry in the parent directory 978 * @inode: The inode to be removed 979 * 980 * Called with all the locks and in a transaction. This will only be 981 * called for a directory after it has been checked to ensure it is empty. 982 * 983 * Returns: 0 on success, or an error 984 */ 985 986 static int gfs2_unlink_inode(struct gfs2_inode *dip, 987 const struct dentry *dentry) 988 { 989 struct inode *inode = dentry->d_inode; 990 struct gfs2_inode *ip = GFS2_I(inode); 991 int error; 992 993 error = gfs2_dir_del(dip, dentry); 994 if (error) 995 return error; 996 997 ip->i_entries = 0; 998 inode->i_ctime = CURRENT_TIME; 999 if (S_ISDIR(inode->i_mode)) 1000 clear_nlink(inode); 1001 else 1002 drop_nlink(inode); 1003 mark_inode_dirty(inode); 1004 if (inode->i_nlink == 0) 1005 gfs2_unlink_di(inode); 1006 return 0; 1007 } 1008 1009 1010 /** 1011 * gfs2_unlink - Unlink an inode (this does rmdir as well) 1012 * @dir: The inode of the directory containing the inode to unlink 1013 * @dentry: The file itself 1014 * 1015 * This routine uses the type of the inode as a flag to figure out 1016 * whether this is an unlink or an rmdir. 1017 * 1018 * Returns: errno 1019 */ 1020 1021 static int gfs2_unlink(struct inode *dir, struct dentry *dentry) 1022 { 1023 struct gfs2_inode *dip = GFS2_I(dir); 1024 struct gfs2_sbd *sdp = GFS2_SB(dir); 1025 struct inode *inode = dentry->d_inode; 1026 struct gfs2_inode *ip = GFS2_I(inode); 1027 struct gfs2_holder ghs[3]; 1028 struct gfs2_rgrpd *rgd; 1029 int error; 1030 1031 error = gfs2_rindex_update(sdp); 1032 if (error) 1033 return error; 1034 1035 error = -EROFS; 1036 1037 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 1038 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); 1039 1040 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1); 1041 if (!rgd) 1042 goto out_inodes; 1043 1044 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2); 1045 1046 1047 error = gfs2_glock_nq(ghs); /* parent */ 1048 if (error) 1049 goto out_parent; 1050 1051 error = gfs2_glock_nq(ghs + 1); /* child */ 1052 if (error) 1053 goto out_child; 1054 1055 error = -ENOENT; 1056 if (inode->i_nlink == 0) 1057 goto out_rgrp; 1058 1059 if (S_ISDIR(inode->i_mode)) { 1060 error = -ENOTEMPTY; 1061 if (ip->i_entries > 2 || inode->i_nlink > 2) 1062 goto out_rgrp; 1063 } 1064 1065 error = gfs2_glock_nq(ghs + 2); /* rgrp */ 1066 if (error) 1067 goto out_rgrp; 1068 1069 error = gfs2_unlink_ok(dip, &dentry->d_name, ip); 1070 if (error) 1071 goto out_gunlock; 1072 1073 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0); 1074 if (error) 1075 goto out_end_trans; 1076 1077 error = gfs2_unlink_inode(dip, dentry); 1078 1079 out_end_trans: 1080 gfs2_trans_end(sdp); 1081 out_gunlock: 1082 gfs2_glock_dq(ghs + 2); 1083 out_rgrp: 1084 gfs2_glock_dq(ghs + 1); 1085 out_child: 1086 gfs2_glock_dq(ghs); 1087 out_parent: 1088 gfs2_holder_uninit(ghs + 2); 1089 out_inodes: 1090 gfs2_holder_uninit(ghs + 1); 1091 gfs2_holder_uninit(ghs); 1092 return error; 1093 } 1094 1095 /** 1096 * gfs2_symlink - Create a symlink 1097 * @dir: The directory to create the symlink in 1098 * @dentry: The dentry to put the symlink in 1099 * @symname: The thing which the link points to 1100 * 1101 * Returns: errno 1102 */ 1103 1104 static int gfs2_symlink(struct inode *dir, struct dentry *dentry, 1105 const char *symname) 1106 { 1107 struct gfs2_sbd *sdp = GFS2_SB(dir); 1108 unsigned int size; 1109 1110 size = strlen(symname); 1111 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1) 1112 return -ENAMETOOLONG; 1113 1114 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0, NULL); 1115 } 1116 1117 /** 1118 * gfs2_mkdir - Make a directory 1119 * @dir: The parent directory of the new one 1120 * @dentry: The dentry of the new directory 1121 * @mode: The mode of the new directory 1122 * 1123 * Returns: errno 1124 */ 1125 1126 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 1127 { 1128 struct gfs2_sbd *sdp = GFS2_SB(dir); 1129 unsigned dsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode); 1130 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0, NULL); 1131 } 1132 1133 /** 1134 * gfs2_mknod - Make a special file 1135 * @dir: The directory in which the special file will reside 1136 * @dentry: The dentry of the special file 1137 * @mode: The mode of the special file 1138 * @dev: The device specification of the special file 1139 * 1140 */ 1141 1142 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, 1143 dev_t dev) 1144 { 1145 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0, NULL); 1146 } 1147 1148 /** 1149 * gfs2_atomic_open - Atomically open a file 1150 * @dir: The directory 1151 * @dentry: The proposed new entry 1152 * @file: The proposed new struct file 1153 * @flags: open flags 1154 * @mode: File mode 1155 * @opened: Flag to say whether the file has been opened or not 1156 * 1157 * Returns: error code or 0 for success 1158 */ 1159 1160 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry, 1161 struct file *file, unsigned flags, 1162 umode_t mode, int *opened) 1163 { 1164 struct dentry *d; 1165 bool excl = !!(flags & O_EXCL); 1166 1167 d = __gfs2_lookup(dir, dentry, file, opened); 1168 if (IS_ERR(d)) 1169 return PTR_ERR(d); 1170 if (d != NULL) 1171 dentry = d; 1172 if (dentry->d_inode) { 1173 if (!(*opened & FILE_OPENED)) { 1174 if (d == NULL) 1175 dget(dentry); 1176 return finish_no_open(file, dentry); 1177 } 1178 dput(d); 1179 return 0; 1180 } 1181 1182 BUG_ON(d != NULL); 1183 if (!(flags & O_CREAT)) 1184 return -ENOENT; 1185 1186 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl, opened); 1187 } 1188 1189 /* 1190 * gfs2_ok_to_move - check if it's ok to move a directory to another directory 1191 * @this: move this 1192 * @to: to here 1193 * 1194 * Follow @to back to the root and make sure we don't encounter @this 1195 * Assumes we already hold the rename lock. 1196 * 1197 * Returns: errno 1198 */ 1199 1200 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) 1201 { 1202 struct inode *dir = &to->i_inode; 1203 struct super_block *sb = dir->i_sb; 1204 struct inode *tmp; 1205 int error = 0; 1206 1207 igrab(dir); 1208 1209 for (;;) { 1210 if (dir == &this->i_inode) { 1211 error = -EINVAL; 1212 break; 1213 } 1214 if (dir == sb->s_root->d_inode) { 1215 error = 0; 1216 break; 1217 } 1218 1219 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1); 1220 if (IS_ERR(tmp)) { 1221 error = PTR_ERR(tmp); 1222 break; 1223 } 1224 1225 iput(dir); 1226 dir = tmp; 1227 } 1228 1229 iput(dir); 1230 1231 return error; 1232 } 1233 1234 /** 1235 * gfs2_rename - Rename a file 1236 * @odir: Parent directory of old file name 1237 * @odentry: The old dentry of the file 1238 * @ndir: Parent directory of new file name 1239 * @ndentry: The new dentry of the file 1240 * 1241 * Returns: errno 1242 */ 1243 1244 static int gfs2_rename(struct inode *odir, struct dentry *odentry, 1245 struct inode *ndir, struct dentry *ndentry) 1246 { 1247 struct gfs2_inode *odip = GFS2_I(odir); 1248 struct gfs2_inode *ndip = GFS2_I(ndir); 1249 struct gfs2_inode *ip = GFS2_I(odentry->d_inode); 1250 struct gfs2_inode *nip = NULL; 1251 struct gfs2_sbd *sdp = GFS2_SB(odir); 1252 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, }; 1253 struct gfs2_rgrpd *nrgd; 1254 unsigned int num_gh; 1255 int dir_rename = 0; 1256 struct gfs2_diradd da = { .nr_blocks = 0, }; 1257 unsigned int x; 1258 int error; 1259 1260 if (ndentry->d_inode) { 1261 nip = GFS2_I(ndentry->d_inode); 1262 if (ip == nip) 1263 return 0; 1264 } 1265 1266 error = gfs2_rindex_update(sdp); 1267 if (error) 1268 return error; 1269 1270 error = gfs2_rs_alloc(ndip); 1271 if (error) 1272 return error; 1273 1274 if (odip != ndip) { 1275 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 1276 0, &r_gh); 1277 if (error) 1278 goto out; 1279 1280 if (S_ISDIR(ip->i_inode.i_mode)) { 1281 dir_rename = 1; 1282 /* don't move a dirctory into it's subdir */ 1283 error = gfs2_ok_to_move(ip, ndip); 1284 if (error) 1285 goto out_gunlock_r; 1286 } 1287 } 1288 1289 num_gh = 1; 1290 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 1291 if (odip != ndip) { 1292 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1293 num_gh++; 1294 } 1295 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1296 num_gh++; 1297 1298 if (nip) { 1299 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1300 num_gh++; 1301 /* grab the resource lock for unlink flag twiddling 1302 * this is the case of the target file already existing 1303 * so we unlink before doing the rename 1304 */ 1305 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1); 1306 if (nrgd) 1307 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++); 1308 } 1309 1310 for (x = 0; x < num_gh; x++) { 1311 error = gfs2_glock_nq(ghs + x); 1312 if (error) 1313 goto out_gunlock; 1314 } 1315 1316 error = -ENOENT; 1317 if (ip->i_inode.i_nlink == 0) 1318 goto out_gunlock; 1319 1320 /* Check out the old directory */ 1321 1322 error = gfs2_unlink_ok(odip, &odentry->d_name, ip); 1323 if (error) 1324 goto out_gunlock; 1325 1326 /* Check out the new directory */ 1327 1328 if (nip) { 1329 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); 1330 if (error) 1331 goto out_gunlock; 1332 1333 if (nip->i_inode.i_nlink == 0) { 1334 error = -EAGAIN; 1335 goto out_gunlock; 1336 } 1337 1338 if (S_ISDIR(nip->i_inode.i_mode)) { 1339 if (nip->i_entries < 2) { 1340 gfs2_consist_inode(nip); 1341 error = -EIO; 1342 goto out_gunlock; 1343 } 1344 if (nip->i_entries > 2) { 1345 error = -ENOTEMPTY; 1346 goto out_gunlock; 1347 } 1348 } 1349 } else { 1350 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC); 1351 if (error) 1352 goto out_gunlock; 1353 1354 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL); 1355 switch (error) { 1356 case -ENOENT: 1357 error = 0; 1358 break; 1359 case 0: 1360 error = -EEXIST; 1361 default: 1362 goto out_gunlock; 1363 }; 1364 1365 if (odip != ndip) { 1366 if (!ndip->i_inode.i_nlink) { 1367 error = -ENOENT; 1368 goto out_gunlock; 1369 } 1370 if (ndip->i_entries == (u32)-1) { 1371 error = -EFBIG; 1372 goto out_gunlock; 1373 } 1374 if (S_ISDIR(ip->i_inode.i_mode) && 1375 ndip->i_inode.i_nlink == (u32)-1) { 1376 error = -EMLINK; 1377 goto out_gunlock; 1378 } 1379 } 1380 } 1381 1382 /* Check out the dir to be renamed */ 1383 1384 if (dir_rename) { 1385 error = gfs2_permission(odentry->d_inode, MAY_WRITE); 1386 if (error) 1387 goto out_gunlock; 1388 } 1389 1390 if (nip == NULL) { 1391 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da); 1392 if (error) 1393 goto out_gunlock; 1394 } 1395 1396 if (da.nr_blocks) { 1397 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, }; 1398 error = gfs2_quota_lock_check(ndip); 1399 if (error) 1400 goto out_gunlock; 1401 1402 error = gfs2_inplace_reserve(ndip, &ap); 1403 if (error) 1404 goto out_gunlock_q; 1405 1406 error = gfs2_trans_begin(sdp, da.nr_blocks + 1407 gfs2_rg_blocks(ndip, da.nr_blocks) + 1408 4 * RES_DINODE + 4 * RES_LEAF + 1409 RES_STATFS + RES_QUOTA + 4, 0); 1410 if (error) 1411 goto out_ipreserv; 1412 } else { 1413 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 1414 5 * RES_LEAF + 4, 0); 1415 if (error) 1416 goto out_gunlock; 1417 } 1418 1419 /* Remove the target file, if it exists */ 1420 1421 if (nip) 1422 error = gfs2_unlink_inode(ndip, ndentry); 1423 1424 if (dir_rename) { 1425 error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR); 1426 if (error) 1427 goto out_end_trans; 1428 } else { 1429 struct buffer_head *dibh; 1430 error = gfs2_meta_inode_buffer(ip, &dibh); 1431 if (error) 1432 goto out_end_trans; 1433 ip->i_inode.i_ctime = CURRENT_TIME; 1434 gfs2_trans_add_meta(ip->i_gl, dibh); 1435 gfs2_dinode_out(ip, dibh->b_data); 1436 brelse(dibh); 1437 } 1438 1439 error = gfs2_dir_del(odip, odentry); 1440 if (error) 1441 goto out_end_trans; 1442 1443 error = gfs2_dir_add(ndir, &ndentry->d_name, ip); 1444 if (error) 1445 goto out_end_trans; 1446 1447 out_end_trans: 1448 gfs2_trans_end(sdp); 1449 out_ipreserv: 1450 if (da.nr_blocks) 1451 gfs2_inplace_release(ndip); 1452 out_gunlock_q: 1453 if (da.nr_blocks) 1454 gfs2_quota_unlock(ndip); 1455 out_gunlock: 1456 while (x--) { 1457 gfs2_glock_dq(ghs + x); 1458 gfs2_holder_uninit(ghs + x); 1459 } 1460 out_gunlock_r: 1461 if (r_gh.gh_gl) 1462 gfs2_glock_dq_uninit(&r_gh); 1463 out: 1464 return error; 1465 } 1466 1467 /** 1468 * gfs2_follow_link - Follow a symbolic link 1469 * @dentry: The dentry of the link 1470 * @nd: Data that we pass to vfs_follow_link() 1471 * 1472 * This can handle symlinks of any size. 1473 * 1474 * Returns: 0 on success or error code 1475 */ 1476 1477 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd) 1478 { 1479 struct gfs2_inode *ip = GFS2_I(dentry->d_inode); 1480 struct gfs2_holder i_gh; 1481 struct buffer_head *dibh; 1482 unsigned int size; 1483 char *buf; 1484 int error; 1485 1486 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); 1487 error = gfs2_glock_nq(&i_gh); 1488 if (error) { 1489 gfs2_holder_uninit(&i_gh); 1490 nd_set_link(nd, ERR_PTR(error)); 1491 return NULL; 1492 } 1493 1494 size = (unsigned int)i_size_read(&ip->i_inode); 1495 if (size == 0) { 1496 gfs2_consist_inode(ip); 1497 buf = ERR_PTR(-EIO); 1498 goto out; 1499 } 1500 1501 error = gfs2_meta_inode_buffer(ip, &dibh); 1502 if (error) { 1503 buf = ERR_PTR(error); 1504 goto out; 1505 } 1506 1507 buf = kzalloc(size + 1, GFP_NOFS); 1508 if (!buf) 1509 buf = ERR_PTR(-ENOMEM); 1510 else 1511 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size); 1512 brelse(dibh); 1513 out: 1514 gfs2_glock_dq_uninit(&i_gh); 1515 nd_set_link(nd, buf); 1516 return NULL; 1517 } 1518 1519 /** 1520 * gfs2_permission - 1521 * @inode: The inode 1522 * @mask: The mask to be tested 1523 * @flags: Indicates whether this is an RCU path walk or not 1524 * 1525 * This may be called from the VFS directly, or from within GFS2 with the 1526 * inode locked, so we look to see if the glock is already locked and only 1527 * lock the glock if its not already been done. 1528 * 1529 * Returns: errno 1530 */ 1531 1532 int gfs2_permission(struct inode *inode, int mask) 1533 { 1534 struct gfs2_inode *ip; 1535 struct gfs2_holder i_gh; 1536 int error; 1537 int unlock = 0; 1538 1539 1540 ip = GFS2_I(inode); 1541 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 1542 if (mask & MAY_NOT_BLOCK) 1543 return -ECHILD; 1544 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); 1545 if (error) 1546 return error; 1547 unlock = 1; 1548 } 1549 1550 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode)) 1551 error = -EACCES; 1552 else 1553 error = generic_permission(inode, mask); 1554 if (unlock) 1555 gfs2_glock_dq_uninit(&i_gh); 1556 1557 return error; 1558 } 1559 1560 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1561 { 1562 setattr_copy(inode, attr); 1563 mark_inode_dirty(inode); 1564 return 0; 1565 } 1566 1567 /** 1568 * gfs2_setattr_simple - 1569 * @ip: 1570 * @attr: 1571 * 1572 * Returns: errno 1573 */ 1574 1575 int gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1576 { 1577 int error; 1578 1579 if (current->journal_info) 1580 return __gfs2_setattr_simple(inode, attr); 1581 1582 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0); 1583 if (error) 1584 return error; 1585 1586 error = __gfs2_setattr_simple(inode, attr); 1587 gfs2_trans_end(GFS2_SB(inode)); 1588 return error; 1589 } 1590 1591 static int setattr_chown(struct inode *inode, struct iattr *attr) 1592 { 1593 struct gfs2_inode *ip = GFS2_I(inode); 1594 struct gfs2_sbd *sdp = GFS2_SB(inode); 1595 kuid_t ouid, nuid; 1596 kgid_t ogid, ngid; 1597 int error; 1598 1599 ouid = inode->i_uid; 1600 ogid = inode->i_gid; 1601 nuid = attr->ia_uid; 1602 ngid = attr->ia_gid; 1603 1604 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid)) 1605 ouid = nuid = NO_UID_QUOTA_CHANGE; 1606 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid)) 1607 ogid = ngid = NO_GID_QUOTA_CHANGE; 1608 1609 error = gfs2_quota_lock(ip, nuid, ngid); 1610 if (error) 1611 return error; 1612 1613 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 1614 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 1615 error = gfs2_quota_check(ip, nuid, ngid); 1616 if (error) 1617 goto out_gunlock_q; 1618 } 1619 1620 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0); 1621 if (error) 1622 goto out_gunlock_q; 1623 1624 error = gfs2_setattr_simple(inode, attr); 1625 if (error) 1626 goto out_end_trans; 1627 1628 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 1629 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 1630 u64 blocks = gfs2_get_inode_blocks(&ip->i_inode); 1631 gfs2_quota_change(ip, -blocks, ouid, ogid); 1632 gfs2_quota_change(ip, blocks, nuid, ngid); 1633 } 1634 1635 out_end_trans: 1636 gfs2_trans_end(sdp); 1637 out_gunlock_q: 1638 gfs2_quota_unlock(ip); 1639 return error; 1640 } 1641 1642 /** 1643 * gfs2_setattr - Change attributes on an inode 1644 * @dentry: The dentry which is changing 1645 * @attr: The structure describing the change 1646 * 1647 * The VFS layer wants to change one or more of an inodes attributes. Write 1648 * that change out to disk. 1649 * 1650 * Returns: errno 1651 */ 1652 1653 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr) 1654 { 1655 struct inode *inode = dentry->d_inode; 1656 struct gfs2_inode *ip = GFS2_I(inode); 1657 struct gfs2_holder i_gh; 1658 int error; 1659 1660 error = gfs2_rs_alloc(ip); 1661 if (error) 1662 return error; 1663 1664 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); 1665 if (error) 1666 return error; 1667 1668 error = -EPERM; 1669 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 1670 goto out; 1671 1672 error = inode_change_ok(inode, attr); 1673 if (error) 1674 goto out; 1675 1676 if (attr->ia_valid & ATTR_SIZE) 1677 error = gfs2_setattr_size(inode, attr->ia_size); 1678 else if (attr->ia_valid & (ATTR_UID | ATTR_GID)) 1679 error = setattr_chown(inode, attr); 1680 else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode)) 1681 error = gfs2_acl_chmod(ip, attr); 1682 else 1683 error = gfs2_setattr_simple(inode, attr); 1684 1685 out: 1686 if (!error) 1687 mark_inode_dirty(inode); 1688 gfs2_glock_dq_uninit(&i_gh); 1689 return error; 1690 } 1691 1692 /** 1693 * gfs2_getattr - Read out an inode's attributes 1694 * @mnt: The vfsmount the inode is being accessed from 1695 * @dentry: The dentry to stat 1696 * @stat: The inode's stats 1697 * 1698 * This may be called from the VFS directly, or from within GFS2 with the 1699 * inode locked, so we look to see if the glock is already locked and only 1700 * lock the glock if its not already been done. Note that its the NFS 1701 * readdirplus operation which causes this to be called (from filldir) 1702 * with the glock already held. 1703 * 1704 * Returns: errno 1705 */ 1706 1707 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry, 1708 struct kstat *stat) 1709 { 1710 struct inode *inode = dentry->d_inode; 1711 struct gfs2_inode *ip = GFS2_I(inode); 1712 struct gfs2_holder gh; 1713 int error; 1714 int unlock = 0; 1715 1716 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 1717 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 1718 if (error) 1719 return error; 1720 unlock = 1; 1721 } 1722 1723 generic_fillattr(inode, stat); 1724 if (unlock) 1725 gfs2_glock_dq_uninit(&gh); 1726 1727 return 0; 1728 } 1729 1730 static int gfs2_setxattr(struct dentry *dentry, const char *name, 1731 const void *data, size_t size, int flags) 1732 { 1733 struct inode *inode = dentry->d_inode; 1734 struct gfs2_inode *ip = GFS2_I(inode); 1735 struct gfs2_holder gh; 1736 int ret; 1737 1738 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 1739 ret = gfs2_glock_nq(&gh); 1740 if (ret == 0) { 1741 ret = gfs2_rs_alloc(ip); 1742 if (ret == 0) 1743 ret = generic_setxattr(dentry, name, data, size, flags); 1744 gfs2_glock_dq(&gh); 1745 } 1746 gfs2_holder_uninit(&gh); 1747 return ret; 1748 } 1749 1750 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name, 1751 void *data, size_t size) 1752 { 1753 struct inode *inode = dentry->d_inode; 1754 struct gfs2_inode *ip = GFS2_I(inode); 1755 struct gfs2_holder gh; 1756 int ret; 1757 1758 /* For selinux during lookup */ 1759 if (gfs2_glock_is_locked_by_me(ip->i_gl)) 1760 return generic_getxattr(dentry, name, data, size); 1761 1762 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 1763 ret = gfs2_glock_nq(&gh); 1764 if (ret == 0) { 1765 ret = generic_getxattr(dentry, name, data, size); 1766 gfs2_glock_dq(&gh); 1767 } 1768 gfs2_holder_uninit(&gh); 1769 return ret; 1770 } 1771 1772 static int gfs2_removexattr(struct dentry *dentry, const char *name) 1773 { 1774 struct inode *inode = dentry->d_inode; 1775 struct gfs2_inode *ip = GFS2_I(inode); 1776 struct gfs2_holder gh; 1777 int ret; 1778 1779 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 1780 ret = gfs2_glock_nq(&gh); 1781 if (ret == 0) { 1782 ret = gfs2_rs_alloc(ip); 1783 if (ret == 0) 1784 ret = generic_removexattr(dentry, name); 1785 gfs2_glock_dq(&gh); 1786 } 1787 gfs2_holder_uninit(&gh); 1788 return ret; 1789 } 1790 1791 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 1792 u64 start, u64 len) 1793 { 1794 struct gfs2_inode *ip = GFS2_I(inode); 1795 struct gfs2_holder gh; 1796 int ret; 1797 1798 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC); 1799 if (ret) 1800 return ret; 1801 1802 mutex_lock(&inode->i_mutex); 1803 1804 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 1805 if (ret) 1806 goto out; 1807 1808 if (gfs2_is_stuffed(ip)) { 1809 u64 phys = ip->i_no_addr << inode->i_blkbits; 1810 u64 size = i_size_read(inode); 1811 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED| 1812 FIEMAP_EXTENT_DATA_INLINE; 1813 phys += sizeof(struct gfs2_dinode); 1814 phys += start; 1815 if (start + len > size) 1816 len = size - start; 1817 if (start < size) 1818 ret = fiemap_fill_next_extent(fieinfo, start, phys, 1819 len, flags); 1820 if (ret == 1) 1821 ret = 0; 1822 } else { 1823 ret = __generic_block_fiemap(inode, fieinfo, start, len, 1824 gfs2_block_map); 1825 } 1826 1827 gfs2_glock_dq_uninit(&gh); 1828 out: 1829 mutex_unlock(&inode->i_mutex); 1830 return ret; 1831 } 1832 1833 const struct inode_operations gfs2_file_iops = { 1834 .permission = gfs2_permission, 1835 .setattr = gfs2_setattr, 1836 .getattr = gfs2_getattr, 1837 .setxattr = gfs2_setxattr, 1838 .getxattr = gfs2_getxattr, 1839 .listxattr = gfs2_listxattr, 1840 .removexattr = gfs2_removexattr, 1841 .fiemap = gfs2_fiemap, 1842 .get_acl = gfs2_get_acl, 1843 }; 1844 1845 const struct inode_operations gfs2_dir_iops = { 1846 .create = gfs2_create, 1847 .lookup = gfs2_lookup, 1848 .link = gfs2_link, 1849 .unlink = gfs2_unlink, 1850 .symlink = gfs2_symlink, 1851 .mkdir = gfs2_mkdir, 1852 .rmdir = gfs2_unlink, 1853 .mknod = gfs2_mknod, 1854 .rename = gfs2_rename, 1855 .permission = gfs2_permission, 1856 .setattr = gfs2_setattr, 1857 .getattr = gfs2_getattr, 1858 .setxattr = gfs2_setxattr, 1859 .getxattr = gfs2_getxattr, 1860 .listxattr = gfs2_listxattr, 1861 .removexattr = gfs2_removexattr, 1862 .fiemap = gfs2_fiemap, 1863 .get_acl = gfs2_get_acl, 1864 .atomic_open = gfs2_atomic_open, 1865 }; 1866 1867 const struct inode_operations gfs2_symlink_iops = { 1868 .readlink = generic_readlink, 1869 .follow_link = gfs2_follow_link, 1870 .put_link = kfree_put_link, 1871 .permission = gfs2_permission, 1872 .setattr = gfs2_setattr, 1873 .getattr = gfs2_getattr, 1874 .setxattr = gfs2_setxattr, 1875 .getxattr = gfs2_getxattr, 1876 .listxattr = gfs2_listxattr, 1877 .removexattr = gfs2_removexattr, 1878 .fiemap = gfs2_fiemap, 1879 .get_acl = gfs2_get_acl, 1880 }; 1881 1882