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