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(-ENOMEM); 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 /** 473 * gfs2_trans_da_blocks - Calculate number of blocks to link inode 474 * @dip: The directory we are linking into 475 * @da: The dir add information 476 * @nr_inodes: The number of inodes involved 477 * 478 * This calculate the number of blocks we need to reserve in a 479 * transaction to link @nr_inodes into a directory. In most cases 480 * @nr_inodes will be 2 (the directory plus the inode being linked in) 481 * but in case of rename, 4 may be required. 482 * 483 * Returns: Number of blocks 484 */ 485 486 static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip, 487 const struct gfs2_diradd *da, 488 unsigned nr_inodes) 489 { 490 return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) + 491 (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS; 492 } 493 494 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, 495 struct gfs2_inode *ip, struct gfs2_diradd *da) 496 { 497 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 498 struct gfs2_alloc_parms ap = { .target = da->nr_blocks, }; 499 int error; 500 501 if (da->nr_blocks) { 502 error = gfs2_quota_lock_check(dip); 503 if (error) 504 goto fail_quota_locks; 505 506 error = gfs2_inplace_reserve(dip, &ap); 507 if (error) 508 goto fail_quota_locks; 509 510 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0); 511 if (error) 512 goto fail_ipreserv; 513 } else { 514 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); 515 if (error) 516 goto fail_quota_locks; 517 } 518 519 error = gfs2_dir_add(&dip->i_inode, name, ip, da); 520 if (error) 521 goto fail_end_trans; 522 523 fail_end_trans: 524 gfs2_trans_end(sdp); 525 fail_ipreserv: 526 gfs2_inplace_release(dip); 527 fail_quota_locks: 528 gfs2_quota_unlock(dip); 529 return error; 530 } 531 532 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array, 533 void *fs_info) 534 { 535 const struct xattr *xattr; 536 int err = 0; 537 538 for (xattr = xattr_array; xattr->name != NULL; xattr++) { 539 err = __gfs2_xattr_set(inode, xattr->name, xattr->value, 540 xattr->value_len, 0, 541 GFS2_EATYPE_SECURITY); 542 if (err < 0) 543 break; 544 } 545 return err; 546 } 547 548 static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip, 549 const struct qstr *qstr) 550 { 551 return security_inode_init_security(&ip->i_inode, &dip->i_inode, qstr, 552 &gfs2_initxattrs, NULL); 553 } 554 555 /** 556 * gfs2_create_inode - Create a new inode 557 * @dir: The parent directory 558 * @dentry: The new dentry 559 * @file: If non-NULL, the file which is being opened 560 * @mode: The permissions on the new inode 561 * @dev: For device nodes, this is the device number 562 * @symname: For symlinks, this is the link destination 563 * @size: The initial size of the inode (ignored for directories) 564 * 565 * Returns: 0 on success, or error code 566 */ 567 568 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry, 569 struct file *file, 570 umode_t mode, dev_t dev, const char *symname, 571 unsigned int size, int excl, int *opened) 572 { 573 const struct qstr *name = &dentry->d_name; 574 struct gfs2_holder ghs[2]; 575 struct inode *inode = NULL; 576 struct gfs2_inode *dip = GFS2_I(dir), *ip; 577 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 578 struct gfs2_glock *io_gl; 579 struct dentry *d; 580 int error; 581 u32 aflags = 0; 582 struct gfs2_diradd da = { .bh = NULL, }; 583 584 if (!name->len || name->len > GFS2_FNAMESIZE) 585 return -ENAMETOOLONG; 586 587 error = gfs2_rs_alloc(dip); 588 if (error) 589 return error; 590 591 error = gfs2_rindex_update(sdp); 592 if (error) 593 return error; 594 595 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 596 if (error) 597 goto fail; 598 599 error = create_ok(dip, name, mode); 600 if (error) 601 goto fail_gunlock; 602 603 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl); 604 error = PTR_ERR(inode); 605 if (!IS_ERR(inode)) { 606 d = d_splice_alias(inode, dentry); 607 error = PTR_ERR(d); 608 if (IS_ERR(d)) 609 goto fail_gunlock; 610 error = 0; 611 if (file) { 612 if (S_ISREG(inode->i_mode)) { 613 WARN_ON(d != NULL); 614 error = finish_open(file, dentry, gfs2_open_common, opened); 615 } else { 616 error = finish_no_open(file, d); 617 } 618 } else { 619 dput(d); 620 } 621 gfs2_glock_dq_uninit(ghs); 622 return error; 623 } else if (error != -ENOENT) { 624 goto fail_gunlock; 625 } 626 627 error = gfs2_diradd_alloc_required(dir, name, &da); 628 if (error < 0) 629 goto fail_gunlock; 630 631 inode = new_inode(sdp->sd_vfs); 632 error = -ENOMEM; 633 if (!inode) 634 goto fail_gunlock; 635 636 ip = GFS2_I(inode); 637 error = gfs2_rs_alloc(ip); 638 if (error) 639 goto fail_free_inode; 640 641 inode->i_mode = mode; 642 set_nlink(inode, S_ISDIR(mode) ? 2 : 1); 643 inode->i_rdev = dev; 644 inode->i_size = size; 645 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 646 gfs2_set_inode_blocks(inode, 1); 647 munge_mode_uid_gid(dip, inode); 648 ip->i_goal = dip->i_goal; 649 ip->i_diskflags = 0; 650 ip->i_eattr = 0; 651 ip->i_height = 0; 652 ip->i_depth = 0; 653 ip->i_entries = 0; 654 655 switch(mode & S_IFMT) { 656 case S_IFREG: 657 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) || 658 gfs2_tune_get(sdp, gt_new_files_jdata)) 659 ip->i_diskflags |= GFS2_DIF_JDATA; 660 gfs2_set_aops(inode); 661 break; 662 case S_IFDIR: 663 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA); 664 ip->i_diskflags |= GFS2_DIF_JDATA; 665 ip->i_entries = 2; 666 break; 667 } 668 gfs2_set_inode_flags(inode); 669 670 if ((GFS2_I(sdp->sd_root_dir->d_inode) == dip) || 671 (dip->i_diskflags & GFS2_DIF_TOPDIR)) 672 aflags |= GFS2_AF_ORLOV; 673 674 error = alloc_dinode(ip, aflags); 675 if (error) 676 goto fail_free_inode; 677 678 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); 679 if (error) 680 goto fail_free_inode; 681 682 ip->i_gl->gl_object = ip; 683 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1); 684 if (error) 685 goto fail_free_inode; 686 687 error = gfs2_trans_begin(sdp, RES_DINODE, 0); 688 if (error) 689 goto fail_gunlock2; 690 691 init_dinode(dip, ip, symname); 692 gfs2_trans_end(sdp); 693 694 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl); 695 if (error) 696 goto fail_gunlock2; 697 698 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); 699 if (error) 700 goto fail_gunlock2; 701 702 ip->i_iopen_gh.gh_gl->gl_object = ip; 703 gfs2_glock_put(io_gl); 704 gfs2_set_iop(inode); 705 insert_inode_hash(inode); 706 707 error = gfs2_acl_create(dip, inode); 708 if (error) 709 goto fail_gunlock3; 710 711 error = gfs2_security_init(dip, ip, name); 712 if (error) 713 goto fail_gunlock3; 714 715 error = link_dinode(dip, name, ip, &da); 716 if (error) 717 goto fail_gunlock3; 718 719 mark_inode_dirty(inode); 720 d_instantiate(dentry, inode); 721 if (file) { 722 *opened |= FILE_CREATED; 723 error = finish_open(file, dentry, gfs2_open_common, opened); 724 } 725 gfs2_glock_dq_uninit(ghs); 726 gfs2_glock_dq_uninit(ghs + 1); 727 return error; 728 729 fail_gunlock3: 730 gfs2_glock_dq_uninit(ghs + 1); 731 if (ip->i_gl) 732 gfs2_glock_put(ip->i_gl); 733 goto fail_gunlock; 734 735 fail_gunlock2: 736 gfs2_glock_dq_uninit(ghs + 1); 737 fail_free_inode: 738 if (ip->i_gl) 739 gfs2_glock_put(ip->i_gl); 740 gfs2_rs_delete(ip, NULL); 741 free_inode_nonrcu(inode); 742 inode = NULL; 743 fail_gunlock: 744 gfs2_dir_no_add(&da); 745 gfs2_glock_dq_uninit(ghs); 746 if (inode && !IS_ERR(inode)) { 747 clear_nlink(inode); 748 mark_inode_dirty(inode); 749 set_bit(GIF_ALLOC_FAILED, &GFS2_I(inode)->i_flags); 750 iput(inode); 751 } 752 fail: 753 return error; 754 } 755 756 /** 757 * gfs2_create - Create a file 758 * @dir: The directory in which to create the file 759 * @dentry: The dentry of the new file 760 * @mode: The mode of the new file 761 * 762 * Returns: errno 763 */ 764 765 static int gfs2_create(struct inode *dir, struct dentry *dentry, 766 umode_t mode, bool excl) 767 { 768 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl, NULL); 769 } 770 771 /** 772 * __gfs2_lookup - Look up a filename in a directory and return its inode 773 * @dir: The directory inode 774 * @dentry: The dentry of the new inode 775 * @file: File to be opened 776 * @opened: atomic_open flags 777 * 778 * 779 * Returns: errno 780 */ 781 782 static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry, 783 struct file *file, int *opened) 784 { 785 struct inode *inode; 786 struct dentry *d; 787 struct gfs2_holder gh; 788 struct gfs2_glock *gl; 789 int error; 790 791 inode = gfs2_lookupi(dir, &dentry->d_name, 0); 792 if (!inode) 793 return NULL; 794 if (IS_ERR(inode)) 795 return ERR_CAST(inode); 796 797 gl = GFS2_I(inode)->i_gl; 798 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 799 if (error) { 800 iput(inode); 801 return ERR_PTR(error); 802 } 803 804 d = d_splice_alias(inode, dentry); 805 if (IS_ERR(d)) { 806 iput(inode); 807 gfs2_glock_dq_uninit(&gh); 808 return d; 809 } 810 if (file && S_ISREG(inode->i_mode)) 811 error = finish_open(file, dentry, gfs2_open_common, opened); 812 813 gfs2_glock_dq_uninit(&gh); 814 if (error) { 815 dput(d); 816 return ERR_PTR(error); 817 } 818 return d; 819 } 820 821 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry, 822 unsigned flags) 823 { 824 return __gfs2_lookup(dir, dentry, NULL, NULL); 825 } 826 827 /** 828 * gfs2_link - Link to a file 829 * @old_dentry: The inode to link 830 * @dir: Add link to this directory 831 * @dentry: The name of the link 832 * 833 * Link the inode in "old_dentry" into the directory "dir" with the 834 * name in "dentry". 835 * 836 * Returns: errno 837 */ 838 839 static int gfs2_link(struct dentry *old_dentry, struct inode *dir, 840 struct dentry *dentry) 841 { 842 struct gfs2_inode *dip = GFS2_I(dir); 843 struct gfs2_sbd *sdp = GFS2_SB(dir); 844 struct inode *inode = old_dentry->d_inode; 845 struct gfs2_inode *ip = GFS2_I(inode); 846 struct gfs2_holder ghs[2]; 847 struct buffer_head *dibh; 848 struct gfs2_diradd da = { .bh = NULL, }; 849 int error; 850 851 if (S_ISDIR(inode->i_mode)) 852 return -EPERM; 853 854 error = gfs2_rs_alloc(dip); 855 if (error) 856 return error; 857 858 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 859 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); 860 861 error = gfs2_glock_nq(ghs); /* parent */ 862 if (error) 863 goto out_parent; 864 865 error = gfs2_glock_nq(ghs + 1); /* child */ 866 if (error) 867 goto out_child; 868 869 error = -ENOENT; 870 if (inode->i_nlink == 0) 871 goto out_gunlock; 872 873 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC); 874 if (error) 875 goto out_gunlock; 876 877 error = gfs2_dir_check(dir, &dentry->d_name, NULL); 878 switch (error) { 879 case -ENOENT: 880 break; 881 case 0: 882 error = -EEXIST; 883 default: 884 goto out_gunlock; 885 } 886 887 error = -EINVAL; 888 if (!dip->i_inode.i_nlink) 889 goto out_gunlock; 890 error = -EFBIG; 891 if (dip->i_entries == (u32)-1) 892 goto out_gunlock; 893 error = -EPERM; 894 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 895 goto out_gunlock; 896 error = -EINVAL; 897 if (!ip->i_inode.i_nlink) 898 goto out_gunlock; 899 error = -EMLINK; 900 if (ip->i_inode.i_nlink == (u32)-1) 901 goto out_gunlock; 902 903 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da); 904 if (error < 0) 905 goto out_gunlock; 906 907 if (da.nr_blocks) { 908 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, }; 909 error = gfs2_quota_lock_check(dip); 910 if (error) 911 goto out_gunlock; 912 913 error = gfs2_inplace_reserve(dip, &ap); 914 if (error) 915 goto out_gunlock_q; 916 917 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0); 918 if (error) 919 goto out_ipres; 920 } else { 921 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0); 922 if (error) 923 goto out_ipres; 924 } 925 926 error = gfs2_meta_inode_buffer(ip, &dibh); 927 if (error) 928 goto out_end_trans; 929 930 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da); 931 if (error) 932 goto out_brelse; 933 934 gfs2_trans_add_meta(ip->i_gl, dibh); 935 inc_nlink(&ip->i_inode); 936 ip->i_inode.i_ctime = CURRENT_TIME; 937 ihold(inode); 938 d_instantiate(dentry, inode); 939 mark_inode_dirty(inode); 940 941 out_brelse: 942 brelse(dibh); 943 out_end_trans: 944 gfs2_trans_end(sdp); 945 out_ipres: 946 if (da.nr_blocks) 947 gfs2_inplace_release(dip); 948 out_gunlock_q: 949 if (da.nr_blocks) 950 gfs2_quota_unlock(dip); 951 out_gunlock: 952 gfs2_dir_no_add(&da); 953 gfs2_glock_dq(ghs + 1); 954 out_child: 955 gfs2_glock_dq(ghs); 956 out_parent: 957 gfs2_holder_uninit(ghs); 958 gfs2_holder_uninit(ghs + 1); 959 return error; 960 } 961 962 /* 963 * gfs2_unlink_ok - check to see that a inode is still in a directory 964 * @dip: the directory 965 * @name: the name of the file 966 * @ip: the inode 967 * 968 * Assumes that the lock on (at least) @dip is held. 969 * 970 * Returns: 0 if the parent/child relationship is correct, errno if it isn't 971 */ 972 973 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, 974 const struct gfs2_inode *ip) 975 { 976 int error; 977 978 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) 979 return -EPERM; 980 981 if ((dip->i_inode.i_mode & S_ISVTX) && 982 !uid_eq(dip->i_inode.i_uid, current_fsuid()) && 983 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER)) 984 return -EPERM; 985 986 if (IS_APPEND(&dip->i_inode)) 987 return -EPERM; 988 989 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC); 990 if (error) 991 return error; 992 993 error = gfs2_dir_check(&dip->i_inode, name, ip); 994 if (error) 995 return error; 996 997 return 0; 998 } 999 1000 /** 1001 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it 1002 * @dip: The parent directory 1003 * @name: The name of the entry in the parent directory 1004 * @inode: The inode to be removed 1005 * 1006 * Called with all the locks and in a transaction. This will only be 1007 * called for a directory after it has been checked to ensure it is empty. 1008 * 1009 * Returns: 0 on success, or an error 1010 */ 1011 1012 static int gfs2_unlink_inode(struct gfs2_inode *dip, 1013 const struct dentry *dentry) 1014 { 1015 struct inode *inode = dentry->d_inode; 1016 struct gfs2_inode *ip = GFS2_I(inode); 1017 int error; 1018 1019 error = gfs2_dir_del(dip, dentry); 1020 if (error) 1021 return error; 1022 1023 ip->i_entries = 0; 1024 inode->i_ctime = CURRENT_TIME; 1025 if (S_ISDIR(inode->i_mode)) 1026 clear_nlink(inode); 1027 else 1028 drop_nlink(inode); 1029 mark_inode_dirty(inode); 1030 if (inode->i_nlink == 0) 1031 gfs2_unlink_di(inode); 1032 return 0; 1033 } 1034 1035 1036 /** 1037 * gfs2_unlink - Unlink an inode (this does rmdir as well) 1038 * @dir: The inode of the directory containing the inode to unlink 1039 * @dentry: The file itself 1040 * 1041 * This routine uses the type of the inode as a flag to figure out 1042 * whether this is an unlink or an rmdir. 1043 * 1044 * Returns: errno 1045 */ 1046 1047 static int gfs2_unlink(struct inode *dir, struct dentry *dentry) 1048 { 1049 struct gfs2_inode *dip = GFS2_I(dir); 1050 struct gfs2_sbd *sdp = GFS2_SB(dir); 1051 struct inode *inode = dentry->d_inode; 1052 struct gfs2_inode *ip = GFS2_I(inode); 1053 struct gfs2_holder ghs[3]; 1054 struct gfs2_rgrpd *rgd; 1055 int error; 1056 1057 error = gfs2_rindex_update(sdp); 1058 if (error) 1059 return error; 1060 1061 error = -EROFS; 1062 1063 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 1064 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); 1065 1066 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1); 1067 if (!rgd) 1068 goto out_inodes; 1069 1070 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2); 1071 1072 1073 error = gfs2_glock_nq(ghs); /* parent */ 1074 if (error) 1075 goto out_parent; 1076 1077 error = gfs2_glock_nq(ghs + 1); /* child */ 1078 if (error) 1079 goto out_child; 1080 1081 error = -ENOENT; 1082 if (inode->i_nlink == 0) 1083 goto out_rgrp; 1084 1085 if (S_ISDIR(inode->i_mode)) { 1086 error = -ENOTEMPTY; 1087 if (ip->i_entries > 2 || inode->i_nlink > 2) 1088 goto out_rgrp; 1089 } 1090 1091 error = gfs2_glock_nq(ghs + 2); /* rgrp */ 1092 if (error) 1093 goto out_rgrp; 1094 1095 error = gfs2_unlink_ok(dip, &dentry->d_name, ip); 1096 if (error) 1097 goto out_gunlock; 1098 1099 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0); 1100 if (error) 1101 goto out_end_trans; 1102 1103 error = gfs2_unlink_inode(dip, dentry); 1104 1105 out_end_trans: 1106 gfs2_trans_end(sdp); 1107 out_gunlock: 1108 gfs2_glock_dq(ghs + 2); 1109 out_rgrp: 1110 gfs2_glock_dq(ghs + 1); 1111 out_child: 1112 gfs2_glock_dq(ghs); 1113 out_parent: 1114 gfs2_holder_uninit(ghs + 2); 1115 out_inodes: 1116 gfs2_holder_uninit(ghs + 1); 1117 gfs2_holder_uninit(ghs); 1118 return error; 1119 } 1120 1121 /** 1122 * gfs2_symlink - Create a symlink 1123 * @dir: The directory to create the symlink in 1124 * @dentry: The dentry to put the symlink in 1125 * @symname: The thing which the link points to 1126 * 1127 * Returns: errno 1128 */ 1129 1130 static int gfs2_symlink(struct inode *dir, struct dentry *dentry, 1131 const char *symname) 1132 { 1133 struct gfs2_sbd *sdp = GFS2_SB(dir); 1134 unsigned int size; 1135 1136 size = strlen(symname); 1137 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1) 1138 return -ENAMETOOLONG; 1139 1140 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0, NULL); 1141 } 1142 1143 /** 1144 * gfs2_mkdir - Make a directory 1145 * @dir: The parent directory of the new one 1146 * @dentry: The dentry of the new directory 1147 * @mode: The mode of the new directory 1148 * 1149 * Returns: errno 1150 */ 1151 1152 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 1153 { 1154 struct gfs2_sbd *sdp = GFS2_SB(dir); 1155 unsigned dsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode); 1156 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0, NULL); 1157 } 1158 1159 /** 1160 * gfs2_mknod - Make a special file 1161 * @dir: The directory in which the special file will reside 1162 * @dentry: The dentry of the special file 1163 * @mode: The mode of the special file 1164 * @dev: The device specification of the special file 1165 * 1166 */ 1167 1168 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, 1169 dev_t dev) 1170 { 1171 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0, NULL); 1172 } 1173 1174 /** 1175 * gfs2_atomic_open - Atomically open a file 1176 * @dir: The directory 1177 * @dentry: The proposed new entry 1178 * @file: The proposed new struct file 1179 * @flags: open flags 1180 * @mode: File mode 1181 * @opened: Flag to say whether the file has been opened or not 1182 * 1183 * Returns: error code or 0 for success 1184 */ 1185 1186 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry, 1187 struct file *file, unsigned flags, 1188 umode_t mode, int *opened) 1189 { 1190 struct dentry *d; 1191 bool excl = !!(flags & O_EXCL); 1192 1193 d = __gfs2_lookup(dir, dentry, file, opened); 1194 if (IS_ERR(d)) 1195 return PTR_ERR(d); 1196 if (d != NULL) 1197 dentry = d; 1198 if (dentry->d_inode) { 1199 if (!(*opened & FILE_OPENED)) { 1200 if (d == NULL) 1201 dget(dentry); 1202 return finish_no_open(file, dentry); 1203 } 1204 dput(d); 1205 return 0; 1206 } 1207 1208 BUG_ON(d != NULL); 1209 if (!(flags & O_CREAT)) 1210 return -ENOENT; 1211 1212 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl, opened); 1213 } 1214 1215 /* 1216 * gfs2_ok_to_move - check if it's ok to move a directory to another directory 1217 * @this: move this 1218 * @to: to here 1219 * 1220 * Follow @to back to the root and make sure we don't encounter @this 1221 * Assumes we already hold the rename lock. 1222 * 1223 * Returns: errno 1224 */ 1225 1226 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) 1227 { 1228 struct inode *dir = &to->i_inode; 1229 struct super_block *sb = dir->i_sb; 1230 struct inode *tmp; 1231 int error = 0; 1232 1233 igrab(dir); 1234 1235 for (;;) { 1236 if (dir == &this->i_inode) { 1237 error = -EINVAL; 1238 break; 1239 } 1240 if (dir == sb->s_root->d_inode) { 1241 error = 0; 1242 break; 1243 } 1244 1245 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1); 1246 if (IS_ERR(tmp)) { 1247 error = PTR_ERR(tmp); 1248 break; 1249 } 1250 1251 iput(dir); 1252 dir = tmp; 1253 } 1254 1255 iput(dir); 1256 1257 return error; 1258 } 1259 1260 /** 1261 * gfs2_rename - Rename a file 1262 * @odir: Parent directory of old file name 1263 * @odentry: The old dentry of the file 1264 * @ndir: Parent directory of new file name 1265 * @ndentry: The new dentry of the file 1266 * 1267 * Returns: errno 1268 */ 1269 1270 static int gfs2_rename(struct inode *odir, struct dentry *odentry, 1271 struct inode *ndir, struct dentry *ndentry) 1272 { 1273 struct gfs2_inode *odip = GFS2_I(odir); 1274 struct gfs2_inode *ndip = GFS2_I(ndir); 1275 struct gfs2_inode *ip = GFS2_I(odentry->d_inode); 1276 struct gfs2_inode *nip = NULL; 1277 struct gfs2_sbd *sdp = GFS2_SB(odir); 1278 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, }; 1279 struct gfs2_rgrpd *nrgd; 1280 unsigned int num_gh; 1281 int dir_rename = 0; 1282 struct gfs2_diradd da = { .nr_blocks = 0, }; 1283 unsigned int x; 1284 int error; 1285 1286 if (ndentry->d_inode) { 1287 nip = GFS2_I(ndentry->d_inode); 1288 if (ip == nip) 1289 return 0; 1290 } 1291 1292 error = gfs2_rindex_update(sdp); 1293 if (error) 1294 return error; 1295 1296 error = gfs2_rs_alloc(ndip); 1297 if (error) 1298 return error; 1299 1300 if (odip != ndip) { 1301 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 1302 0, &r_gh); 1303 if (error) 1304 goto out; 1305 1306 if (S_ISDIR(ip->i_inode.i_mode)) { 1307 dir_rename = 1; 1308 /* don't move a dirctory into it's subdir */ 1309 error = gfs2_ok_to_move(ip, ndip); 1310 if (error) 1311 goto out_gunlock_r; 1312 } 1313 } 1314 1315 num_gh = 1; 1316 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 1317 if (odip != ndip) { 1318 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1319 num_gh++; 1320 } 1321 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1322 num_gh++; 1323 1324 if (nip) { 1325 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1326 num_gh++; 1327 /* grab the resource lock for unlink flag twiddling 1328 * this is the case of the target file already existing 1329 * so we unlink before doing the rename 1330 */ 1331 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1); 1332 if (nrgd) 1333 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++); 1334 } 1335 1336 for (x = 0; x < num_gh; x++) { 1337 error = gfs2_glock_nq(ghs + x); 1338 if (error) 1339 goto out_gunlock; 1340 } 1341 1342 error = -ENOENT; 1343 if (ip->i_inode.i_nlink == 0) 1344 goto out_gunlock; 1345 1346 /* Check out the old directory */ 1347 1348 error = gfs2_unlink_ok(odip, &odentry->d_name, ip); 1349 if (error) 1350 goto out_gunlock; 1351 1352 /* Check out the new directory */ 1353 1354 if (nip) { 1355 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); 1356 if (error) 1357 goto out_gunlock; 1358 1359 if (nip->i_inode.i_nlink == 0) { 1360 error = -EAGAIN; 1361 goto out_gunlock; 1362 } 1363 1364 if (S_ISDIR(nip->i_inode.i_mode)) { 1365 if (nip->i_entries < 2) { 1366 gfs2_consist_inode(nip); 1367 error = -EIO; 1368 goto out_gunlock; 1369 } 1370 if (nip->i_entries > 2) { 1371 error = -ENOTEMPTY; 1372 goto out_gunlock; 1373 } 1374 } 1375 } else { 1376 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC); 1377 if (error) 1378 goto out_gunlock; 1379 1380 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL); 1381 switch (error) { 1382 case -ENOENT: 1383 error = 0; 1384 break; 1385 case 0: 1386 error = -EEXIST; 1387 default: 1388 goto out_gunlock; 1389 }; 1390 1391 if (odip != ndip) { 1392 if (!ndip->i_inode.i_nlink) { 1393 error = -ENOENT; 1394 goto out_gunlock; 1395 } 1396 if (ndip->i_entries == (u32)-1) { 1397 error = -EFBIG; 1398 goto out_gunlock; 1399 } 1400 if (S_ISDIR(ip->i_inode.i_mode) && 1401 ndip->i_inode.i_nlink == (u32)-1) { 1402 error = -EMLINK; 1403 goto out_gunlock; 1404 } 1405 } 1406 } 1407 1408 /* Check out the dir to be renamed */ 1409 1410 if (dir_rename) { 1411 error = gfs2_permission(odentry->d_inode, MAY_WRITE); 1412 if (error) 1413 goto out_gunlock; 1414 } 1415 1416 if (nip == NULL) { 1417 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da); 1418 if (error) 1419 goto out_gunlock; 1420 } 1421 1422 if (da.nr_blocks) { 1423 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, }; 1424 error = gfs2_quota_lock_check(ndip); 1425 if (error) 1426 goto out_gunlock; 1427 1428 error = gfs2_inplace_reserve(ndip, &ap); 1429 if (error) 1430 goto out_gunlock_q; 1431 1432 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) + 1433 4 * RES_LEAF + 4, 0); 1434 if (error) 1435 goto out_ipreserv; 1436 } else { 1437 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 1438 5 * RES_LEAF + 4, 0); 1439 if (error) 1440 goto out_gunlock; 1441 } 1442 1443 /* Remove the target file, if it exists */ 1444 1445 if (nip) 1446 error = gfs2_unlink_inode(ndip, ndentry); 1447 1448 if (dir_rename) { 1449 error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR); 1450 if (error) 1451 goto out_end_trans; 1452 } else { 1453 struct buffer_head *dibh; 1454 error = gfs2_meta_inode_buffer(ip, &dibh); 1455 if (error) 1456 goto out_end_trans; 1457 ip->i_inode.i_ctime = CURRENT_TIME; 1458 gfs2_trans_add_meta(ip->i_gl, dibh); 1459 gfs2_dinode_out(ip, dibh->b_data); 1460 brelse(dibh); 1461 } 1462 1463 error = gfs2_dir_del(odip, odentry); 1464 if (error) 1465 goto out_end_trans; 1466 1467 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da); 1468 if (error) 1469 goto out_end_trans; 1470 1471 out_end_trans: 1472 gfs2_trans_end(sdp); 1473 out_ipreserv: 1474 if (da.nr_blocks) 1475 gfs2_inplace_release(ndip); 1476 out_gunlock_q: 1477 if (da.nr_blocks) 1478 gfs2_quota_unlock(ndip); 1479 out_gunlock: 1480 gfs2_dir_no_add(&da); 1481 while (x--) { 1482 gfs2_glock_dq(ghs + x); 1483 gfs2_holder_uninit(ghs + x); 1484 } 1485 out_gunlock_r: 1486 if (r_gh.gh_gl) 1487 gfs2_glock_dq_uninit(&r_gh); 1488 out: 1489 return error; 1490 } 1491 1492 /** 1493 * gfs2_follow_link - Follow a symbolic link 1494 * @dentry: The dentry of the link 1495 * @nd: Data that we pass to vfs_follow_link() 1496 * 1497 * This can handle symlinks of any size. 1498 * 1499 * Returns: 0 on success or error code 1500 */ 1501 1502 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd) 1503 { 1504 struct gfs2_inode *ip = GFS2_I(dentry->d_inode); 1505 struct gfs2_holder i_gh; 1506 struct buffer_head *dibh; 1507 unsigned int size; 1508 char *buf; 1509 int error; 1510 1511 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); 1512 error = gfs2_glock_nq(&i_gh); 1513 if (error) { 1514 gfs2_holder_uninit(&i_gh); 1515 nd_set_link(nd, ERR_PTR(error)); 1516 return NULL; 1517 } 1518 1519 size = (unsigned int)i_size_read(&ip->i_inode); 1520 if (size == 0) { 1521 gfs2_consist_inode(ip); 1522 buf = ERR_PTR(-EIO); 1523 goto out; 1524 } 1525 1526 error = gfs2_meta_inode_buffer(ip, &dibh); 1527 if (error) { 1528 buf = ERR_PTR(error); 1529 goto out; 1530 } 1531 1532 buf = kzalloc(size + 1, GFP_NOFS); 1533 if (!buf) 1534 buf = ERR_PTR(-ENOMEM); 1535 else 1536 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size); 1537 brelse(dibh); 1538 out: 1539 gfs2_glock_dq_uninit(&i_gh); 1540 nd_set_link(nd, buf); 1541 return NULL; 1542 } 1543 1544 /** 1545 * gfs2_permission - 1546 * @inode: The inode 1547 * @mask: The mask to be tested 1548 * @flags: Indicates whether this is an RCU path walk or not 1549 * 1550 * This may be called from the VFS directly, or from within GFS2 with the 1551 * inode locked, so we look to see if the glock is already locked and only 1552 * lock the glock if its not already been done. 1553 * 1554 * Returns: errno 1555 */ 1556 1557 int gfs2_permission(struct inode *inode, int mask) 1558 { 1559 struct gfs2_inode *ip; 1560 struct gfs2_holder i_gh; 1561 int error; 1562 int unlock = 0; 1563 1564 1565 ip = GFS2_I(inode); 1566 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 1567 if (mask & MAY_NOT_BLOCK) 1568 return -ECHILD; 1569 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); 1570 if (error) 1571 return error; 1572 unlock = 1; 1573 } 1574 1575 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode)) 1576 error = -EACCES; 1577 else 1578 error = generic_permission(inode, mask); 1579 if (unlock) 1580 gfs2_glock_dq_uninit(&i_gh); 1581 1582 return error; 1583 } 1584 1585 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1586 { 1587 setattr_copy(inode, attr); 1588 mark_inode_dirty(inode); 1589 return 0; 1590 } 1591 1592 /** 1593 * gfs2_setattr_simple - 1594 * @ip: 1595 * @attr: 1596 * 1597 * Returns: errno 1598 */ 1599 1600 int gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1601 { 1602 int error; 1603 1604 if (current->journal_info) 1605 return __gfs2_setattr_simple(inode, attr); 1606 1607 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0); 1608 if (error) 1609 return error; 1610 1611 error = __gfs2_setattr_simple(inode, attr); 1612 gfs2_trans_end(GFS2_SB(inode)); 1613 return error; 1614 } 1615 1616 static int setattr_chown(struct inode *inode, struct iattr *attr) 1617 { 1618 struct gfs2_inode *ip = GFS2_I(inode); 1619 struct gfs2_sbd *sdp = GFS2_SB(inode); 1620 kuid_t ouid, nuid; 1621 kgid_t ogid, ngid; 1622 int error; 1623 1624 ouid = inode->i_uid; 1625 ogid = inode->i_gid; 1626 nuid = attr->ia_uid; 1627 ngid = attr->ia_gid; 1628 1629 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid)) 1630 ouid = nuid = NO_UID_QUOTA_CHANGE; 1631 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid)) 1632 ogid = ngid = NO_GID_QUOTA_CHANGE; 1633 1634 error = get_write_access(inode); 1635 if (error) 1636 return error; 1637 1638 error = gfs2_rs_alloc(ip); 1639 if (error) 1640 goto out; 1641 1642 error = gfs2_rindex_update(sdp); 1643 if (error) 1644 goto out; 1645 1646 error = gfs2_quota_lock(ip, nuid, ngid); 1647 if (error) 1648 goto out; 1649 1650 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 1651 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 1652 error = gfs2_quota_check(ip, nuid, ngid); 1653 if (error) 1654 goto out_gunlock_q; 1655 } 1656 1657 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0); 1658 if (error) 1659 goto out_gunlock_q; 1660 1661 error = gfs2_setattr_simple(inode, attr); 1662 if (error) 1663 goto out_end_trans; 1664 1665 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 1666 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 1667 u64 blocks = gfs2_get_inode_blocks(&ip->i_inode); 1668 gfs2_quota_change(ip, -blocks, ouid, ogid); 1669 gfs2_quota_change(ip, blocks, nuid, ngid); 1670 } 1671 1672 out_end_trans: 1673 gfs2_trans_end(sdp); 1674 out_gunlock_q: 1675 gfs2_quota_unlock(ip); 1676 out: 1677 put_write_access(inode); 1678 return error; 1679 } 1680 1681 /** 1682 * gfs2_setattr - Change attributes on an inode 1683 * @dentry: The dentry which is changing 1684 * @attr: The structure describing the change 1685 * 1686 * The VFS layer wants to change one or more of an inodes attributes. Write 1687 * that change out to disk. 1688 * 1689 * Returns: errno 1690 */ 1691 1692 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr) 1693 { 1694 struct inode *inode = dentry->d_inode; 1695 struct gfs2_inode *ip = GFS2_I(inode); 1696 struct gfs2_holder i_gh; 1697 int error; 1698 1699 error = gfs2_rs_alloc(ip); 1700 if (error) 1701 return error; 1702 1703 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); 1704 if (error) 1705 return error; 1706 1707 error = -EPERM; 1708 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 1709 goto out; 1710 1711 error = inode_change_ok(inode, attr); 1712 if (error) 1713 goto out; 1714 1715 if (attr->ia_valid & ATTR_SIZE) 1716 error = gfs2_setattr_size(inode, attr->ia_size); 1717 else if (attr->ia_valid & (ATTR_UID | ATTR_GID)) 1718 error = setattr_chown(inode, attr); 1719 else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode)) 1720 error = gfs2_acl_chmod(ip, attr); 1721 else 1722 error = gfs2_setattr_simple(inode, attr); 1723 1724 out: 1725 if (!error) 1726 mark_inode_dirty(inode); 1727 gfs2_glock_dq_uninit(&i_gh); 1728 return error; 1729 } 1730 1731 /** 1732 * gfs2_getattr - Read out an inode's attributes 1733 * @mnt: The vfsmount the inode is being accessed from 1734 * @dentry: The dentry to stat 1735 * @stat: The inode's stats 1736 * 1737 * This may be called from the VFS directly, or from within GFS2 with the 1738 * inode locked, so we look to see if the glock is already locked and only 1739 * lock the glock if its not already been done. Note that its the NFS 1740 * readdirplus operation which causes this to be called (from filldir) 1741 * with the glock already held. 1742 * 1743 * Returns: errno 1744 */ 1745 1746 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry, 1747 struct kstat *stat) 1748 { 1749 struct inode *inode = dentry->d_inode; 1750 struct gfs2_inode *ip = GFS2_I(inode); 1751 struct gfs2_holder gh; 1752 int error; 1753 int unlock = 0; 1754 1755 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 1756 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 1757 if (error) 1758 return error; 1759 unlock = 1; 1760 } 1761 1762 generic_fillattr(inode, stat); 1763 if (unlock) 1764 gfs2_glock_dq_uninit(&gh); 1765 1766 return 0; 1767 } 1768 1769 static int gfs2_setxattr(struct dentry *dentry, const char *name, 1770 const void *data, size_t size, int flags) 1771 { 1772 struct inode *inode = dentry->d_inode; 1773 struct gfs2_inode *ip = GFS2_I(inode); 1774 struct gfs2_holder gh; 1775 int ret; 1776 1777 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 1778 ret = gfs2_glock_nq(&gh); 1779 if (ret == 0) { 1780 ret = gfs2_rs_alloc(ip); 1781 if (ret == 0) 1782 ret = generic_setxattr(dentry, name, data, size, flags); 1783 gfs2_glock_dq(&gh); 1784 } 1785 gfs2_holder_uninit(&gh); 1786 return ret; 1787 } 1788 1789 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name, 1790 void *data, size_t size) 1791 { 1792 struct inode *inode = dentry->d_inode; 1793 struct gfs2_inode *ip = GFS2_I(inode); 1794 struct gfs2_holder gh; 1795 int ret; 1796 1797 /* For selinux during lookup */ 1798 if (gfs2_glock_is_locked_by_me(ip->i_gl)) 1799 return generic_getxattr(dentry, name, data, size); 1800 1801 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 1802 ret = gfs2_glock_nq(&gh); 1803 if (ret == 0) { 1804 ret = generic_getxattr(dentry, name, data, size); 1805 gfs2_glock_dq(&gh); 1806 } 1807 gfs2_holder_uninit(&gh); 1808 return ret; 1809 } 1810 1811 static int gfs2_removexattr(struct dentry *dentry, const char *name) 1812 { 1813 struct inode *inode = dentry->d_inode; 1814 struct gfs2_inode *ip = GFS2_I(inode); 1815 struct gfs2_holder gh; 1816 int ret; 1817 1818 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 1819 ret = gfs2_glock_nq(&gh); 1820 if (ret == 0) { 1821 ret = gfs2_rs_alloc(ip); 1822 if (ret == 0) 1823 ret = generic_removexattr(dentry, name); 1824 gfs2_glock_dq(&gh); 1825 } 1826 gfs2_holder_uninit(&gh); 1827 return ret; 1828 } 1829 1830 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 1831 u64 start, u64 len) 1832 { 1833 struct gfs2_inode *ip = GFS2_I(inode); 1834 struct gfs2_holder gh; 1835 int ret; 1836 1837 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC); 1838 if (ret) 1839 return ret; 1840 1841 mutex_lock(&inode->i_mutex); 1842 1843 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 1844 if (ret) 1845 goto out; 1846 1847 if (gfs2_is_stuffed(ip)) { 1848 u64 phys = ip->i_no_addr << inode->i_blkbits; 1849 u64 size = i_size_read(inode); 1850 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED| 1851 FIEMAP_EXTENT_DATA_INLINE; 1852 phys += sizeof(struct gfs2_dinode); 1853 phys += start; 1854 if (start + len > size) 1855 len = size - start; 1856 if (start < size) 1857 ret = fiemap_fill_next_extent(fieinfo, start, phys, 1858 len, flags); 1859 if (ret == 1) 1860 ret = 0; 1861 } else { 1862 ret = __generic_block_fiemap(inode, fieinfo, start, len, 1863 gfs2_block_map); 1864 } 1865 1866 gfs2_glock_dq_uninit(&gh); 1867 out: 1868 mutex_unlock(&inode->i_mutex); 1869 return ret; 1870 } 1871 1872 const struct inode_operations gfs2_file_iops = { 1873 .permission = gfs2_permission, 1874 .setattr = gfs2_setattr, 1875 .getattr = gfs2_getattr, 1876 .setxattr = gfs2_setxattr, 1877 .getxattr = gfs2_getxattr, 1878 .listxattr = gfs2_listxattr, 1879 .removexattr = gfs2_removexattr, 1880 .fiemap = gfs2_fiemap, 1881 .get_acl = gfs2_get_acl, 1882 }; 1883 1884 const struct inode_operations gfs2_dir_iops = { 1885 .create = gfs2_create, 1886 .lookup = gfs2_lookup, 1887 .link = gfs2_link, 1888 .unlink = gfs2_unlink, 1889 .symlink = gfs2_symlink, 1890 .mkdir = gfs2_mkdir, 1891 .rmdir = gfs2_unlink, 1892 .mknod = gfs2_mknod, 1893 .rename = gfs2_rename, 1894 .permission = gfs2_permission, 1895 .setattr = gfs2_setattr, 1896 .getattr = gfs2_getattr, 1897 .setxattr = gfs2_setxattr, 1898 .getxattr = gfs2_getxattr, 1899 .listxattr = gfs2_listxattr, 1900 .removexattr = gfs2_removexattr, 1901 .fiemap = gfs2_fiemap, 1902 .get_acl = gfs2_get_acl, 1903 .atomic_open = gfs2_atomic_open, 1904 }; 1905 1906 const struct inode_operations gfs2_symlink_iops = { 1907 .readlink = generic_readlink, 1908 .follow_link = gfs2_follow_link, 1909 .put_link = kfree_put_link, 1910 .permission = gfs2_permission, 1911 .setattr = gfs2_setattr, 1912 .getattr = gfs2_getattr, 1913 .setxattr = gfs2_setxattr, 1914 .getxattr = gfs2_getxattr, 1915 .listxattr = gfs2_listxattr, 1916 .removexattr = gfs2_removexattr, 1917 .fiemap = gfs2_fiemap, 1918 .get_acl = gfs2_get_acl, 1919 }; 1920 1921