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, int arq) 474 { 475 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 476 struct gfs2_alloc_parms ap = { .target = sdp->sd_max_dirres, }; 477 int error; 478 479 if (arq) { 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, sdp->sd_max_dirres + 489 dip->i_rgd->rd_length + 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 int arq; 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 arq = error = gfs2_diradd_alloc_required(dir, name); 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, arq); 694 if (error) 695 goto fail_gunlock3; 696 697 mark_inode_dirty(inode); 698 d_instantiate(dentry, inode); 699 if (file) 700 error = finish_open(file, dentry, gfs2_open_common, opened); 701 gfs2_glock_dq_uninit(ghs); 702 gfs2_glock_dq_uninit(ghs + 1); 703 return error; 704 705 fail_gunlock3: 706 gfs2_glock_dq_uninit(ghs + 1); 707 if (ip->i_gl) 708 gfs2_glock_put(ip->i_gl); 709 goto fail_gunlock; 710 711 fail_gunlock2: 712 gfs2_glock_dq_uninit(ghs + 1); 713 fail_free_inode: 714 if (ip->i_gl) 715 gfs2_glock_put(ip->i_gl); 716 gfs2_rs_delete(ip, NULL); 717 free_inode_nonrcu(inode); 718 inode = NULL; 719 fail_gunlock: 720 gfs2_glock_dq_uninit(ghs); 721 if (inode && !IS_ERR(inode)) { 722 clear_nlink(inode); 723 mark_inode_dirty(inode); 724 set_bit(GIF_ALLOC_FAILED, &GFS2_I(inode)->i_flags); 725 iput(inode); 726 } 727 fail: 728 return error; 729 } 730 731 /** 732 * gfs2_create - Create a file 733 * @dir: The directory in which to create the file 734 * @dentry: The dentry of the new file 735 * @mode: The mode of the new file 736 * 737 * Returns: errno 738 */ 739 740 static int gfs2_create(struct inode *dir, struct dentry *dentry, 741 umode_t mode, bool excl) 742 { 743 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl, NULL); 744 } 745 746 /** 747 * __gfs2_lookup - Look up a filename in a directory and return its inode 748 * @dir: The directory inode 749 * @dentry: The dentry of the new inode 750 * @file: File to be opened 751 * @opened: atomic_open flags 752 * 753 * 754 * Returns: errno 755 */ 756 757 static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry, 758 struct file *file, int *opened) 759 { 760 struct inode *inode; 761 struct dentry *d; 762 struct gfs2_holder gh; 763 struct gfs2_glock *gl; 764 int error; 765 766 inode = gfs2_lookupi(dir, &dentry->d_name, 0); 767 if (!inode) 768 return NULL; 769 if (IS_ERR(inode)) 770 return ERR_CAST(inode); 771 772 gl = GFS2_I(inode)->i_gl; 773 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 774 if (error) { 775 iput(inode); 776 return ERR_PTR(error); 777 } 778 779 d = d_splice_alias(inode, dentry); 780 if (file && S_ISREG(inode->i_mode)) 781 error = finish_open(file, dentry, gfs2_open_common, opened); 782 783 gfs2_glock_dq_uninit(&gh); 784 if (error) { 785 dput(d); 786 return ERR_PTR(error); 787 } 788 return d; 789 } 790 791 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry, 792 unsigned flags) 793 { 794 return __gfs2_lookup(dir, dentry, NULL, NULL); 795 } 796 797 /** 798 * gfs2_link - Link to a file 799 * @old_dentry: The inode to link 800 * @dir: Add link to this directory 801 * @dentry: The name of the link 802 * 803 * Link the inode in "old_dentry" into the directory "dir" with the 804 * name in "dentry". 805 * 806 * Returns: errno 807 */ 808 809 static int gfs2_link(struct dentry *old_dentry, struct inode *dir, 810 struct dentry *dentry) 811 { 812 struct gfs2_inode *dip = GFS2_I(dir); 813 struct gfs2_sbd *sdp = GFS2_SB(dir); 814 struct inode *inode = old_dentry->d_inode; 815 struct gfs2_inode *ip = GFS2_I(inode); 816 struct gfs2_holder ghs[2]; 817 struct buffer_head *dibh; 818 int alloc_required; 819 int error; 820 821 if (S_ISDIR(inode->i_mode)) 822 return -EPERM; 823 824 error = gfs2_rs_alloc(dip); 825 if (error) 826 return error; 827 828 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 829 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); 830 831 error = gfs2_glock_nq(ghs); /* parent */ 832 if (error) 833 goto out_parent; 834 835 error = gfs2_glock_nq(ghs + 1); /* child */ 836 if (error) 837 goto out_child; 838 839 error = -ENOENT; 840 if (inode->i_nlink == 0) 841 goto out_gunlock; 842 843 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC); 844 if (error) 845 goto out_gunlock; 846 847 error = gfs2_dir_check(dir, &dentry->d_name, NULL); 848 switch (error) { 849 case -ENOENT: 850 break; 851 case 0: 852 error = -EEXIST; 853 default: 854 goto out_gunlock; 855 } 856 857 error = -EINVAL; 858 if (!dip->i_inode.i_nlink) 859 goto out_gunlock; 860 error = -EFBIG; 861 if (dip->i_entries == (u32)-1) 862 goto out_gunlock; 863 error = -EPERM; 864 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 865 goto out_gunlock; 866 error = -EINVAL; 867 if (!ip->i_inode.i_nlink) 868 goto out_gunlock; 869 error = -EMLINK; 870 if (ip->i_inode.i_nlink == (u32)-1) 871 goto out_gunlock; 872 873 alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name); 874 if (error < 0) 875 goto out_gunlock; 876 error = 0; 877 878 if (alloc_required) { 879 struct gfs2_alloc_parms ap = { .target = sdp->sd_max_dirres, }; 880 error = gfs2_quota_lock_check(dip); 881 if (error) 882 goto out_gunlock; 883 884 error = gfs2_inplace_reserve(dip, &ap); 885 if (error) 886 goto out_gunlock_q; 887 888 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + 889 gfs2_rg_blocks(dip, sdp->sd_max_dirres) + 890 2 * RES_DINODE + RES_STATFS + 891 RES_QUOTA, 0); 892 if (error) 893 goto out_ipres; 894 } else { 895 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0); 896 if (error) 897 goto out_ipres; 898 } 899 900 error = gfs2_meta_inode_buffer(ip, &dibh); 901 if (error) 902 goto out_end_trans; 903 904 error = gfs2_dir_add(dir, &dentry->d_name, ip); 905 if (error) 906 goto out_brelse; 907 908 gfs2_trans_add_meta(ip->i_gl, dibh); 909 inc_nlink(&ip->i_inode); 910 ip->i_inode.i_ctime = CURRENT_TIME; 911 ihold(inode); 912 d_instantiate(dentry, inode); 913 mark_inode_dirty(inode); 914 915 out_brelse: 916 brelse(dibh); 917 out_end_trans: 918 gfs2_trans_end(sdp); 919 out_ipres: 920 if (alloc_required) 921 gfs2_inplace_release(dip); 922 out_gunlock_q: 923 if (alloc_required) 924 gfs2_quota_unlock(dip); 925 out_gunlock: 926 gfs2_glock_dq(ghs + 1); 927 out_child: 928 gfs2_glock_dq(ghs); 929 out_parent: 930 gfs2_holder_uninit(ghs); 931 gfs2_holder_uninit(ghs + 1); 932 return error; 933 } 934 935 /* 936 * gfs2_unlink_ok - check to see that a inode is still in a directory 937 * @dip: the directory 938 * @name: the name of the file 939 * @ip: the inode 940 * 941 * Assumes that the lock on (at least) @dip is held. 942 * 943 * Returns: 0 if the parent/child relationship is correct, errno if it isn't 944 */ 945 946 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, 947 const struct gfs2_inode *ip) 948 { 949 int error; 950 951 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) 952 return -EPERM; 953 954 if ((dip->i_inode.i_mode & S_ISVTX) && 955 !uid_eq(dip->i_inode.i_uid, current_fsuid()) && 956 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER)) 957 return -EPERM; 958 959 if (IS_APPEND(&dip->i_inode)) 960 return -EPERM; 961 962 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC); 963 if (error) 964 return error; 965 966 error = gfs2_dir_check(&dip->i_inode, name, ip); 967 if (error) 968 return error; 969 970 return 0; 971 } 972 973 /** 974 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it 975 * @dip: The parent directory 976 * @name: The name of the entry in the parent directory 977 * @inode: The inode to be removed 978 * 979 * Called with all the locks and in a transaction. This will only be 980 * called for a directory after it has been checked to ensure it is empty. 981 * 982 * Returns: 0 on success, or an error 983 */ 984 985 static int gfs2_unlink_inode(struct gfs2_inode *dip, 986 const struct dentry *dentry) 987 { 988 struct inode *inode = dentry->d_inode; 989 struct gfs2_inode *ip = GFS2_I(inode); 990 int error; 991 992 error = gfs2_dir_del(dip, dentry); 993 if (error) 994 return error; 995 996 ip->i_entries = 0; 997 inode->i_ctime = CURRENT_TIME; 998 if (S_ISDIR(inode->i_mode)) 999 clear_nlink(inode); 1000 else 1001 drop_nlink(inode); 1002 mark_inode_dirty(inode); 1003 if (inode->i_nlink == 0) 1004 gfs2_unlink_di(inode); 1005 return 0; 1006 } 1007 1008 1009 /** 1010 * gfs2_unlink - Unlink an inode (this does rmdir as well) 1011 * @dir: The inode of the directory containing the inode to unlink 1012 * @dentry: The file itself 1013 * 1014 * This routine uses the type of the inode as a flag to figure out 1015 * whether this is an unlink or an rmdir. 1016 * 1017 * Returns: errno 1018 */ 1019 1020 static int gfs2_unlink(struct inode *dir, struct dentry *dentry) 1021 { 1022 struct gfs2_inode *dip = GFS2_I(dir); 1023 struct gfs2_sbd *sdp = GFS2_SB(dir); 1024 struct inode *inode = dentry->d_inode; 1025 struct gfs2_inode *ip = GFS2_I(inode); 1026 struct gfs2_holder ghs[3]; 1027 struct gfs2_rgrpd *rgd; 1028 int error; 1029 1030 error = gfs2_rindex_update(sdp); 1031 if (error) 1032 return error; 1033 1034 error = -EROFS; 1035 1036 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 1037 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); 1038 1039 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1); 1040 if (!rgd) 1041 goto out_inodes; 1042 1043 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2); 1044 1045 1046 error = gfs2_glock_nq(ghs); /* parent */ 1047 if (error) 1048 goto out_parent; 1049 1050 error = gfs2_glock_nq(ghs + 1); /* child */ 1051 if (error) 1052 goto out_child; 1053 1054 error = -ENOENT; 1055 if (inode->i_nlink == 0) 1056 goto out_rgrp; 1057 1058 if (S_ISDIR(inode->i_mode)) { 1059 error = -ENOTEMPTY; 1060 if (ip->i_entries > 2 || inode->i_nlink > 2) 1061 goto out_rgrp; 1062 } 1063 1064 error = gfs2_glock_nq(ghs + 2); /* rgrp */ 1065 if (error) 1066 goto out_rgrp; 1067 1068 error = gfs2_unlink_ok(dip, &dentry->d_name, ip); 1069 if (error) 1070 goto out_gunlock; 1071 1072 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0); 1073 if (error) 1074 goto out_end_trans; 1075 1076 error = gfs2_unlink_inode(dip, dentry); 1077 1078 out_end_trans: 1079 gfs2_trans_end(sdp); 1080 out_gunlock: 1081 gfs2_glock_dq(ghs + 2); 1082 out_rgrp: 1083 gfs2_glock_dq(ghs + 1); 1084 out_child: 1085 gfs2_glock_dq(ghs); 1086 out_parent: 1087 gfs2_holder_uninit(ghs + 2); 1088 out_inodes: 1089 gfs2_holder_uninit(ghs + 1); 1090 gfs2_holder_uninit(ghs); 1091 return error; 1092 } 1093 1094 /** 1095 * gfs2_symlink - Create a symlink 1096 * @dir: The directory to create the symlink in 1097 * @dentry: The dentry to put the symlink in 1098 * @symname: The thing which the link points to 1099 * 1100 * Returns: errno 1101 */ 1102 1103 static int gfs2_symlink(struct inode *dir, struct dentry *dentry, 1104 const char *symname) 1105 { 1106 struct gfs2_sbd *sdp = GFS2_SB(dir); 1107 unsigned int size; 1108 1109 size = strlen(symname); 1110 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1) 1111 return -ENAMETOOLONG; 1112 1113 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0, NULL); 1114 } 1115 1116 /** 1117 * gfs2_mkdir - Make a directory 1118 * @dir: The parent directory of the new one 1119 * @dentry: The dentry of the new directory 1120 * @mode: The mode of the new directory 1121 * 1122 * Returns: errno 1123 */ 1124 1125 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 1126 { 1127 struct gfs2_sbd *sdp = GFS2_SB(dir); 1128 unsigned dsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode); 1129 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0, NULL); 1130 } 1131 1132 /** 1133 * gfs2_mknod - Make a special file 1134 * @dir: The directory in which the special file will reside 1135 * @dentry: The dentry of the special file 1136 * @mode: The mode of the special file 1137 * @dev: The device specification of the special file 1138 * 1139 */ 1140 1141 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, 1142 dev_t dev) 1143 { 1144 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0, NULL); 1145 } 1146 1147 /** 1148 * gfs2_atomic_open - Atomically open a file 1149 * @dir: The directory 1150 * @dentry: The proposed new entry 1151 * @file: The proposed new struct file 1152 * @flags: open flags 1153 * @mode: File mode 1154 * @opened: Flag to say whether the file has been opened or not 1155 * 1156 * Returns: error code or 0 for success 1157 */ 1158 1159 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry, 1160 struct file *file, unsigned flags, 1161 umode_t mode, int *opened) 1162 { 1163 struct dentry *d; 1164 bool excl = !!(flags & O_EXCL); 1165 1166 d = __gfs2_lookup(dir, dentry, file, opened); 1167 if (IS_ERR(d)) 1168 return PTR_ERR(d); 1169 if (d != NULL) 1170 dentry = d; 1171 if (dentry->d_inode) { 1172 if (!(*opened & FILE_OPENED)) 1173 return finish_no_open(file, dentry); 1174 dput(d); 1175 return 0; 1176 } 1177 1178 BUG_ON(d != NULL); 1179 if (!(flags & O_CREAT)) 1180 return -ENOENT; 1181 1182 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl, opened); 1183 } 1184 1185 /* 1186 * gfs2_ok_to_move - check if it's ok to move a directory to another directory 1187 * @this: move this 1188 * @to: to here 1189 * 1190 * Follow @to back to the root and make sure we don't encounter @this 1191 * Assumes we already hold the rename lock. 1192 * 1193 * Returns: errno 1194 */ 1195 1196 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) 1197 { 1198 struct inode *dir = &to->i_inode; 1199 struct super_block *sb = dir->i_sb; 1200 struct inode *tmp; 1201 int error = 0; 1202 1203 igrab(dir); 1204 1205 for (;;) { 1206 if (dir == &this->i_inode) { 1207 error = -EINVAL; 1208 break; 1209 } 1210 if (dir == sb->s_root->d_inode) { 1211 error = 0; 1212 break; 1213 } 1214 1215 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1); 1216 if (IS_ERR(tmp)) { 1217 error = PTR_ERR(tmp); 1218 break; 1219 } 1220 1221 iput(dir); 1222 dir = tmp; 1223 } 1224 1225 iput(dir); 1226 1227 return error; 1228 } 1229 1230 /** 1231 * gfs2_rename - Rename a file 1232 * @odir: Parent directory of old file name 1233 * @odentry: The old dentry of the file 1234 * @ndir: Parent directory of new file name 1235 * @ndentry: The new dentry of the file 1236 * 1237 * Returns: errno 1238 */ 1239 1240 static int gfs2_rename(struct inode *odir, struct dentry *odentry, 1241 struct inode *ndir, struct dentry *ndentry) 1242 { 1243 struct gfs2_inode *odip = GFS2_I(odir); 1244 struct gfs2_inode *ndip = GFS2_I(ndir); 1245 struct gfs2_inode *ip = GFS2_I(odentry->d_inode); 1246 struct gfs2_inode *nip = NULL; 1247 struct gfs2_sbd *sdp = GFS2_SB(odir); 1248 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, }; 1249 struct gfs2_rgrpd *nrgd; 1250 unsigned int num_gh; 1251 int dir_rename = 0; 1252 int alloc_required = 0; 1253 unsigned int x; 1254 int error; 1255 1256 if (ndentry->d_inode) { 1257 nip = GFS2_I(ndentry->d_inode); 1258 if (ip == nip) 1259 return 0; 1260 } 1261 1262 error = gfs2_rindex_update(sdp); 1263 if (error) 1264 return error; 1265 1266 error = gfs2_rs_alloc(ndip); 1267 if (error) 1268 return error; 1269 1270 if (odip != ndip) { 1271 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 1272 0, &r_gh); 1273 if (error) 1274 goto out; 1275 1276 if (S_ISDIR(ip->i_inode.i_mode)) { 1277 dir_rename = 1; 1278 /* don't move a dirctory into it's subdir */ 1279 error = gfs2_ok_to_move(ip, ndip); 1280 if (error) 1281 goto out_gunlock_r; 1282 } 1283 } 1284 1285 num_gh = 1; 1286 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 1287 if (odip != ndip) { 1288 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1289 num_gh++; 1290 } 1291 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1292 num_gh++; 1293 1294 if (nip) { 1295 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1296 num_gh++; 1297 /* grab the resource lock for unlink flag twiddling 1298 * this is the case of the target file already existing 1299 * so we unlink before doing the rename 1300 */ 1301 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1); 1302 if (nrgd) 1303 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++); 1304 } 1305 1306 for (x = 0; x < num_gh; x++) { 1307 error = gfs2_glock_nq(ghs + x); 1308 if (error) 1309 goto out_gunlock; 1310 } 1311 1312 error = -ENOENT; 1313 if (ip->i_inode.i_nlink == 0) 1314 goto out_gunlock; 1315 1316 /* Check out the old directory */ 1317 1318 error = gfs2_unlink_ok(odip, &odentry->d_name, ip); 1319 if (error) 1320 goto out_gunlock; 1321 1322 /* Check out the new directory */ 1323 1324 if (nip) { 1325 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); 1326 if (error) 1327 goto out_gunlock; 1328 1329 if (nip->i_inode.i_nlink == 0) { 1330 error = -EAGAIN; 1331 goto out_gunlock; 1332 } 1333 1334 if (S_ISDIR(nip->i_inode.i_mode)) { 1335 if (nip->i_entries < 2) { 1336 gfs2_consist_inode(nip); 1337 error = -EIO; 1338 goto out_gunlock; 1339 } 1340 if (nip->i_entries > 2) { 1341 error = -ENOTEMPTY; 1342 goto out_gunlock; 1343 } 1344 } 1345 } else { 1346 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC); 1347 if (error) 1348 goto out_gunlock; 1349 1350 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL); 1351 switch (error) { 1352 case -ENOENT: 1353 error = 0; 1354 break; 1355 case 0: 1356 error = -EEXIST; 1357 default: 1358 goto out_gunlock; 1359 }; 1360 1361 if (odip != ndip) { 1362 if (!ndip->i_inode.i_nlink) { 1363 error = -ENOENT; 1364 goto out_gunlock; 1365 } 1366 if (ndip->i_entries == (u32)-1) { 1367 error = -EFBIG; 1368 goto out_gunlock; 1369 } 1370 if (S_ISDIR(ip->i_inode.i_mode) && 1371 ndip->i_inode.i_nlink == (u32)-1) { 1372 error = -EMLINK; 1373 goto out_gunlock; 1374 } 1375 } 1376 } 1377 1378 /* Check out the dir to be renamed */ 1379 1380 if (dir_rename) { 1381 error = gfs2_permission(odentry->d_inode, MAY_WRITE); 1382 if (error) 1383 goto out_gunlock; 1384 } 1385 1386 if (nip == NULL) 1387 alloc_required = gfs2_diradd_alloc_required(ndir, &ndentry->d_name); 1388 error = alloc_required; 1389 if (error < 0) 1390 goto out_gunlock; 1391 1392 if (alloc_required) { 1393 struct gfs2_alloc_parms ap = { .target = sdp->sd_max_dirres, }; 1394 error = gfs2_quota_lock_check(ndip); 1395 if (error) 1396 goto out_gunlock; 1397 1398 error = gfs2_inplace_reserve(ndip, &ap); 1399 if (error) 1400 goto out_gunlock_q; 1401 1402 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + 1403 gfs2_rg_blocks(ndip, sdp->sd_max_dirres) + 1404 4 * RES_DINODE + 4 * RES_LEAF + 1405 RES_STATFS + RES_QUOTA + 4, 0); 1406 if (error) 1407 goto out_ipreserv; 1408 } else { 1409 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 1410 5 * RES_LEAF + 4, 0); 1411 if (error) 1412 goto out_gunlock; 1413 } 1414 1415 /* Remove the target file, if it exists */ 1416 1417 if (nip) 1418 error = gfs2_unlink_inode(ndip, ndentry); 1419 1420 if (dir_rename) { 1421 error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR); 1422 if (error) 1423 goto out_end_trans; 1424 } else { 1425 struct buffer_head *dibh; 1426 error = gfs2_meta_inode_buffer(ip, &dibh); 1427 if (error) 1428 goto out_end_trans; 1429 ip->i_inode.i_ctime = CURRENT_TIME; 1430 gfs2_trans_add_meta(ip->i_gl, dibh); 1431 gfs2_dinode_out(ip, dibh->b_data); 1432 brelse(dibh); 1433 } 1434 1435 error = gfs2_dir_del(odip, odentry); 1436 if (error) 1437 goto out_end_trans; 1438 1439 error = gfs2_dir_add(ndir, &ndentry->d_name, ip); 1440 if (error) 1441 goto out_end_trans; 1442 1443 out_end_trans: 1444 gfs2_trans_end(sdp); 1445 out_ipreserv: 1446 if (alloc_required) 1447 gfs2_inplace_release(ndip); 1448 out_gunlock_q: 1449 if (alloc_required) 1450 gfs2_quota_unlock(ndip); 1451 out_gunlock: 1452 while (x--) { 1453 gfs2_glock_dq(ghs + x); 1454 gfs2_holder_uninit(ghs + x); 1455 } 1456 out_gunlock_r: 1457 if (r_gh.gh_gl) 1458 gfs2_glock_dq_uninit(&r_gh); 1459 out: 1460 return error; 1461 } 1462 1463 /** 1464 * gfs2_follow_link - Follow a symbolic link 1465 * @dentry: The dentry of the link 1466 * @nd: Data that we pass to vfs_follow_link() 1467 * 1468 * This can handle symlinks of any size. 1469 * 1470 * Returns: 0 on success or error code 1471 */ 1472 1473 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd) 1474 { 1475 struct gfs2_inode *ip = GFS2_I(dentry->d_inode); 1476 struct gfs2_holder i_gh; 1477 struct buffer_head *dibh; 1478 unsigned int size; 1479 char *buf; 1480 int error; 1481 1482 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); 1483 error = gfs2_glock_nq(&i_gh); 1484 if (error) { 1485 gfs2_holder_uninit(&i_gh); 1486 nd_set_link(nd, ERR_PTR(error)); 1487 return NULL; 1488 } 1489 1490 size = (unsigned int)i_size_read(&ip->i_inode); 1491 if (size == 0) { 1492 gfs2_consist_inode(ip); 1493 buf = ERR_PTR(-EIO); 1494 goto out; 1495 } 1496 1497 error = gfs2_meta_inode_buffer(ip, &dibh); 1498 if (error) { 1499 buf = ERR_PTR(error); 1500 goto out; 1501 } 1502 1503 buf = kzalloc(size + 1, GFP_NOFS); 1504 if (!buf) 1505 buf = ERR_PTR(-ENOMEM); 1506 else 1507 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size); 1508 brelse(dibh); 1509 out: 1510 gfs2_glock_dq_uninit(&i_gh); 1511 nd_set_link(nd, buf); 1512 return NULL; 1513 } 1514 1515 static void gfs2_put_link(struct dentry *dentry, struct nameidata *nd, void *p) 1516 { 1517 char *s = nd_get_link(nd); 1518 if (!IS_ERR(s)) 1519 kfree(s); 1520 } 1521 1522 /** 1523 * gfs2_permission - 1524 * @inode: The inode 1525 * @mask: The mask to be tested 1526 * @flags: Indicates whether this is an RCU path walk or not 1527 * 1528 * This may be called from the VFS directly, or from within GFS2 with the 1529 * inode locked, so we look to see if the glock is already locked and only 1530 * lock the glock if its not already been done. 1531 * 1532 * Returns: errno 1533 */ 1534 1535 int gfs2_permission(struct inode *inode, int mask) 1536 { 1537 struct gfs2_inode *ip; 1538 struct gfs2_holder i_gh; 1539 int error; 1540 int unlock = 0; 1541 1542 1543 ip = GFS2_I(inode); 1544 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 1545 if (mask & MAY_NOT_BLOCK) 1546 return -ECHILD; 1547 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); 1548 if (error) 1549 return error; 1550 unlock = 1; 1551 } 1552 1553 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode)) 1554 error = -EACCES; 1555 else 1556 error = generic_permission(inode, mask); 1557 if (unlock) 1558 gfs2_glock_dq_uninit(&i_gh); 1559 1560 return error; 1561 } 1562 1563 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1564 { 1565 setattr_copy(inode, attr); 1566 mark_inode_dirty(inode); 1567 return 0; 1568 } 1569 1570 /** 1571 * gfs2_setattr_simple - 1572 * @ip: 1573 * @attr: 1574 * 1575 * Returns: errno 1576 */ 1577 1578 int gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1579 { 1580 int error; 1581 1582 if (current->journal_info) 1583 return __gfs2_setattr_simple(inode, attr); 1584 1585 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0); 1586 if (error) 1587 return error; 1588 1589 error = __gfs2_setattr_simple(inode, attr); 1590 gfs2_trans_end(GFS2_SB(inode)); 1591 return error; 1592 } 1593 1594 static int setattr_chown(struct inode *inode, struct iattr *attr) 1595 { 1596 struct gfs2_inode *ip = GFS2_I(inode); 1597 struct gfs2_sbd *sdp = GFS2_SB(inode); 1598 kuid_t ouid, nuid; 1599 kgid_t ogid, ngid; 1600 int error; 1601 1602 ouid = inode->i_uid; 1603 ogid = inode->i_gid; 1604 nuid = attr->ia_uid; 1605 ngid = attr->ia_gid; 1606 1607 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid)) 1608 ouid = nuid = NO_UID_QUOTA_CHANGE; 1609 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid)) 1610 ogid = ngid = NO_GID_QUOTA_CHANGE; 1611 1612 error = gfs2_quota_lock(ip, nuid, ngid); 1613 if (error) 1614 return error; 1615 1616 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 1617 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 1618 error = gfs2_quota_check(ip, nuid, ngid); 1619 if (error) 1620 goto out_gunlock_q; 1621 } 1622 1623 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0); 1624 if (error) 1625 goto out_gunlock_q; 1626 1627 error = gfs2_setattr_simple(inode, attr); 1628 if (error) 1629 goto out_end_trans; 1630 1631 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 1632 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 1633 u64 blocks = gfs2_get_inode_blocks(&ip->i_inode); 1634 gfs2_quota_change(ip, -blocks, ouid, ogid); 1635 gfs2_quota_change(ip, blocks, nuid, ngid); 1636 } 1637 1638 out_end_trans: 1639 gfs2_trans_end(sdp); 1640 out_gunlock_q: 1641 gfs2_quota_unlock(ip); 1642 return error; 1643 } 1644 1645 /** 1646 * gfs2_setattr - Change attributes on an inode 1647 * @dentry: The dentry which is changing 1648 * @attr: The structure describing the change 1649 * 1650 * The VFS layer wants to change one or more of an inodes attributes. Write 1651 * that change out to disk. 1652 * 1653 * Returns: errno 1654 */ 1655 1656 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr) 1657 { 1658 struct inode *inode = dentry->d_inode; 1659 struct gfs2_inode *ip = GFS2_I(inode); 1660 struct gfs2_holder i_gh; 1661 int error; 1662 1663 error = gfs2_rs_alloc(ip); 1664 if (error) 1665 return error; 1666 1667 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); 1668 if (error) 1669 return error; 1670 1671 error = -EPERM; 1672 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 1673 goto out; 1674 1675 error = inode_change_ok(inode, attr); 1676 if (error) 1677 goto out; 1678 1679 if (attr->ia_valid & ATTR_SIZE) 1680 error = gfs2_setattr_size(inode, attr->ia_size); 1681 else if (attr->ia_valid & (ATTR_UID | ATTR_GID)) 1682 error = setattr_chown(inode, attr); 1683 else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode)) 1684 error = gfs2_acl_chmod(ip, attr); 1685 else 1686 error = gfs2_setattr_simple(inode, attr); 1687 1688 out: 1689 if (!error) 1690 mark_inode_dirty(inode); 1691 gfs2_glock_dq_uninit(&i_gh); 1692 return error; 1693 } 1694 1695 /** 1696 * gfs2_getattr - Read out an inode's attributes 1697 * @mnt: The vfsmount the inode is being accessed from 1698 * @dentry: The dentry to stat 1699 * @stat: The inode's stats 1700 * 1701 * This may be called from the VFS directly, or from within GFS2 with the 1702 * inode locked, so we look to see if the glock is already locked and only 1703 * lock the glock if its not already been done. Note that its the NFS 1704 * readdirplus operation which causes this to be called (from filldir) 1705 * with the glock already held. 1706 * 1707 * Returns: errno 1708 */ 1709 1710 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry, 1711 struct kstat *stat) 1712 { 1713 struct inode *inode = dentry->d_inode; 1714 struct gfs2_inode *ip = GFS2_I(inode); 1715 struct gfs2_holder gh; 1716 int error; 1717 int unlock = 0; 1718 1719 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 1720 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 1721 if (error) 1722 return error; 1723 unlock = 1; 1724 } 1725 1726 generic_fillattr(inode, stat); 1727 if (unlock) 1728 gfs2_glock_dq_uninit(&gh); 1729 1730 return 0; 1731 } 1732 1733 static int gfs2_setxattr(struct dentry *dentry, const char *name, 1734 const void *data, size_t size, int flags) 1735 { 1736 struct inode *inode = dentry->d_inode; 1737 struct gfs2_inode *ip = GFS2_I(inode); 1738 struct gfs2_holder gh; 1739 int ret; 1740 1741 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 1742 ret = gfs2_glock_nq(&gh); 1743 if (ret == 0) { 1744 ret = gfs2_rs_alloc(ip); 1745 if (ret == 0) 1746 ret = generic_setxattr(dentry, name, data, size, flags); 1747 gfs2_glock_dq(&gh); 1748 } 1749 gfs2_holder_uninit(&gh); 1750 return ret; 1751 } 1752 1753 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name, 1754 void *data, size_t size) 1755 { 1756 struct inode *inode = dentry->d_inode; 1757 struct gfs2_inode *ip = GFS2_I(inode); 1758 struct gfs2_holder gh; 1759 int ret; 1760 1761 /* For selinux during lookup */ 1762 if (gfs2_glock_is_locked_by_me(ip->i_gl)) 1763 return generic_getxattr(dentry, name, data, size); 1764 1765 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 1766 ret = gfs2_glock_nq(&gh); 1767 if (ret == 0) { 1768 ret = generic_getxattr(dentry, name, data, size); 1769 gfs2_glock_dq(&gh); 1770 } 1771 gfs2_holder_uninit(&gh); 1772 return ret; 1773 } 1774 1775 static int gfs2_removexattr(struct dentry *dentry, const char *name) 1776 { 1777 struct inode *inode = dentry->d_inode; 1778 struct gfs2_inode *ip = GFS2_I(inode); 1779 struct gfs2_holder gh; 1780 int ret; 1781 1782 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 1783 ret = gfs2_glock_nq(&gh); 1784 if (ret == 0) { 1785 ret = gfs2_rs_alloc(ip); 1786 if (ret == 0) 1787 ret = generic_removexattr(dentry, name); 1788 gfs2_glock_dq(&gh); 1789 } 1790 gfs2_holder_uninit(&gh); 1791 return ret; 1792 } 1793 1794 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 1795 u64 start, u64 len) 1796 { 1797 struct gfs2_inode *ip = GFS2_I(inode); 1798 struct gfs2_holder gh; 1799 int ret; 1800 1801 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC); 1802 if (ret) 1803 return ret; 1804 1805 mutex_lock(&inode->i_mutex); 1806 1807 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 1808 if (ret) 1809 goto out; 1810 1811 if (gfs2_is_stuffed(ip)) { 1812 u64 phys = ip->i_no_addr << inode->i_blkbits; 1813 u64 size = i_size_read(inode); 1814 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED| 1815 FIEMAP_EXTENT_DATA_INLINE; 1816 phys += sizeof(struct gfs2_dinode); 1817 phys += start; 1818 if (start + len > size) 1819 len = size - start; 1820 if (start < size) 1821 ret = fiemap_fill_next_extent(fieinfo, start, phys, 1822 len, flags); 1823 if (ret == 1) 1824 ret = 0; 1825 } else { 1826 ret = __generic_block_fiemap(inode, fieinfo, start, len, 1827 gfs2_block_map); 1828 } 1829 1830 gfs2_glock_dq_uninit(&gh); 1831 out: 1832 mutex_unlock(&inode->i_mutex); 1833 return ret; 1834 } 1835 1836 const struct inode_operations gfs2_file_iops = { 1837 .permission = gfs2_permission, 1838 .setattr = gfs2_setattr, 1839 .getattr = gfs2_getattr, 1840 .setxattr = gfs2_setxattr, 1841 .getxattr = gfs2_getxattr, 1842 .listxattr = gfs2_listxattr, 1843 .removexattr = gfs2_removexattr, 1844 .fiemap = gfs2_fiemap, 1845 .get_acl = gfs2_get_acl, 1846 }; 1847 1848 const struct inode_operations gfs2_dir_iops = { 1849 .create = gfs2_create, 1850 .lookup = gfs2_lookup, 1851 .link = gfs2_link, 1852 .unlink = gfs2_unlink, 1853 .symlink = gfs2_symlink, 1854 .mkdir = gfs2_mkdir, 1855 .rmdir = gfs2_unlink, 1856 .mknod = gfs2_mknod, 1857 .rename = gfs2_rename, 1858 .permission = gfs2_permission, 1859 .setattr = gfs2_setattr, 1860 .getattr = gfs2_getattr, 1861 .setxattr = gfs2_setxattr, 1862 .getxattr = gfs2_getxattr, 1863 .listxattr = gfs2_listxattr, 1864 .removexattr = gfs2_removexattr, 1865 .fiemap = gfs2_fiemap, 1866 .get_acl = gfs2_get_acl, 1867 .atomic_open = gfs2_atomic_open, 1868 }; 1869 1870 const struct inode_operations gfs2_symlink_iops = { 1871 .readlink = generic_readlink, 1872 .follow_link = gfs2_follow_link, 1873 .put_link = gfs2_put_link, 1874 .permission = gfs2_permission, 1875 .setattr = gfs2_setattr, 1876 .getattr = gfs2_getattr, 1877 .setxattr = gfs2_setxattr, 1878 .getxattr = gfs2_getxattr, 1879 .listxattr = gfs2_listxattr, 1880 .removexattr = gfs2_removexattr, 1881 .fiemap = gfs2_fiemap, 1882 .get_acl = gfs2_get_acl, 1883 }; 1884 1885