1 /* 2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 3 * Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved. 4 * 5 * This copyrighted material is made available to anyone wishing to use, 6 * modify, copy, or redistribute it subject to the terms and conditions 7 * of the GNU General Public License version 2. 8 */ 9 10 #include <linux/slab.h> 11 #include <linux/spinlock.h> 12 #include <linux/completion.h> 13 #include <linux/buffer_head.h> 14 #include <linux/namei.h> 15 #include <linux/mm.h> 16 #include <linux/xattr.h> 17 #include <linux/posix_acl.h> 18 #include <linux/gfs2_ondisk.h> 19 #include <linux/crc32.h> 20 #include <linux/fiemap.h> 21 #include <linux/security.h> 22 #include <asm/uaccess.h> 23 24 #include "gfs2.h" 25 #include "incore.h" 26 #include "acl.h" 27 #include "bmap.h" 28 #include "dir.h" 29 #include "xattr.h" 30 #include "glock.h" 31 #include "inode.h" 32 #include "meta_io.h" 33 #include "quota.h" 34 #include "rgrp.h" 35 #include "trans.h" 36 #include "util.h" 37 #include "super.h" 38 #include "glops.h" 39 40 struct gfs2_skip_data { 41 u64 no_addr; 42 int skipped; 43 int non_block; 44 }; 45 46 static int iget_test(struct inode *inode, void *opaque) 47 { 48 struct gfs2_inode *ip = GFS2_I(inode); 49 struct gfs2_skip_data *data = opaque; 50 51 if (ip->i_no_addr == data->no_addr) { 52 if (data->non_block && 53 inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE)) { 54 data->skipped = 1; 55 return 0; 56 } 57 return 1; 58 } 59 return 0; 60 } 61 62 static int iget_set(struct inode *inode, void *opaque) 63 { 64 struct gfs2_inode *ip = GFS2_I(inode); 65 struct gfs2_skip_data *data = opaque; 66 67 if (data->skipped) 68 return -ENOENT; 69 inode->i_ino = (unsigned long)(data->no_addr); 70 ip->i_no_addr = data->no_addr; 71 return 0; 72 } 73 74 struct inode *gfs2_ilookup(struct super_block *sb, u64 no_addr, int non_block) 75 { 76 unsigned long hash = (unsigned long)no_addr; 77 struct gfs2_skip_data data; 78 79 data.no_addr = no_addr; 80 data.skipped = 0; 81 data.non_block = non_block; 82 return ilookup5(sb, hash, iget_test, &data); 83 } 84 85 static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr, 86 int non_block) 87 { 88 struct gfs2_skip_data data; 89 unsigned long hash = (unsigned long)no_addr; 90 91 data.no_addr = no_addr; 92 data.skipped = 0; 93 data.non_block = non_block; 94 return iget5_locked(sb, hash, iget_test, iget_set, &data); 95 } 96 97 /** 98 * gfs2_set_iop - Sets inode operations 99 * @inode: The inode with correct i_mode filled in 100 * 101 * GFS2 lookup code fills in vfs inode contents based on info obtained 102 * from directory entry inside gfs2_inode_lookup(). 103 */ 104 105 static void gfs2_set_iop(struct inode *inode) 106 { 107 struct gfs2_sbd *sdp = GFS2_SB(inode); 108 umode_t mode = inode->i_mode; 109 110 if (S_ISREG(mode)) { 111 inode->i_op = &gfs2_file_iops; 112 if (gfs2_localflocks(sdp)) 113 inode->i_fop = &gfs2_file_fops_nolock; 114 else 115 inode->i_fop = &gfs2_file_fops; 116 } else if (S_ISDIR(mode)) { 117 inode->i_op = &gfs2_dir_iops; 118 if (gfs2_localflocks(sdp)) 119 inode->i_fop = &gfs2_dir_fops_nolock; 120 else 121 inode->i_fop = &gfs2_dir_fops; 122 } else if (S_ISLNK(mode)) { 123 inode->i_op = &gfs2_symlink_iops; 124 } else { 125 inode->i_op = &gfs2_file_iops; 126 init_special_inode(inode, inode->i_mode, inode->i_rdev); 127 } 128 } 129 130 /** 131 * gfs2_inode_lookup - Lookup an inode 132 * @sb: The super block 133 * @no_addr: The inode number 134 * @type: The type of the inode 135 * non_block: Can we block on inodes that are being freed? 136 * 137 * Returns: A VFS inode, or an error 138 */ 139 140 struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type, 141 u64 no_addr, u64 no_formal_ino, int non_block) 142 { 143 struct inode *inode; 144 struct gfs2_inode *ip; 145 struct gfs2_glock *io_gl = NULL; 146 int error; 147 148 inode = gfs2_iget(sb, no_addr, non_block); 149 ip = GFS2_I(inode); 150 151 if (!inode) 152 return ERR_PTR(-ENOBUFS); 153 154 if (inode->i_state & I_NEW) { 155 struct gfs2_sbd *sdp = GFS2_SB(inode); 156 ip->i_no_formal_ino = no_formal_ino; 157 158 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); 159 if (unlikely(error)) 160 goto fail; 161 ip->i_gl->gl_object = ip; 162 163 error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl); 164 if (unlikely(error)) 165 goto fail_put; 166 167 set_bit(GIF_INVALID, &ip->i_flags); 168 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); 169 if (unlikely(error)) 170 goto fail_iopen; 171 172 ip->i_iopen_gh.gh_gl->gl_object = ip; 173 gfs2_glock_put(io_gl); 174 io_gl = NULL; 175 176 if (type == DT_UNKNOWN) { 177 /* Inode glock must be locked already */ 178 error = gfs2_inode_refresh(GFS2_I(inode)); 179 if (error) 180 goto fail_refresh; 181 } else { 182 inode->i_mode = DT2IF(type); 183 } 184 185 gfs2_set_iop(inode); 186 unlock_new_inode(inode); 187 } 188 189 return inode; 190 191 fail_refresh: 192 ip->i_iopen_gh.gh_flags |= GL_NOCACHE; 193 ip->i_iopen_gh.gh_gl->gl_object = NULL; 194 gfs2_glock_dq_uninit(&ip->i_iopen_gh); 195 fail_iopen: 196 if (io_gl) 197 gfs2_glock_put(io_gl); 198 fail_put: 199 ip->i_gl->gl_object = NULL; 200 gfs2_glock_put(ip->i_gl); 201 fail: 202 iget_failed(inode); 203 return ERR_PTR(error); 204 } 205 206 struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr, 207 u64 *no_formal_ino, unsigned int blktype) 208 { 209 struct super_block *sb = sdp->sd_vfs; 210 struct gfs2_holder i_gh; 211 struct inode *inode = NULL; 212 int error; 213 214 /* Must not read in block until block type is verified */ 215 error = gfs2_glock_nq_num(sdp, no_addr, &gfs2_inode_glops, 216 LM_ST_EXCLUSIVE, GL_SKIP, &i_gh); 217 if (error) 218 return ERR_PTR(error); 219 220 error = gfs2_check_blk_type(sdp, no_addr, blktype); 221 if (error) 222 goto fail; 223 224 inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, 0, 1); 225 if (IS_ERR(inode)) 226 goto fail; 227 228 /* Two extra checks for NFS only */ 229 if (no_formal_ino) { 230 error = -ESTALE; 231 if (GFS2_I(inode)->i_no_formal_ino != *no_formal_ino) 232 goto fail_iput; 233 234 error = -EIO; 235 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM) 236 goto fail_iput; 237 238 error = 0; 239 } 240 241 fail: 242 gfs2_glock_dq_uninit(&i_gh); 243 return error ? ERR_PTR(error) : inode; 244 fail_iput: 245 iput(inode); 246 goto fail; 247 } 248 249 250 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name) 251 { 252 struct qstr qstr; 253 struct inode *inode; 254 gfs2_str2qstr(&qstr, name); 255 inode = gfs2_lookupi(dip, &qstr, 1); 256 /* gfs2_lookupi has inconsistent callers: vfs 257 * related routines expect NULL for no entry found, 258 * gfs2_lookup_simple callers expect ENOENT 259 * and do not check for NULL. 260 */ 261 if (inode == NULL) 262 return ERR_PTR(-ENOENT); 263 else 264 return inode; 265 } 266 267 268 /** 269 * gfs2_lookupi - Look up a filename in a directory and return its inode 270 * @d_gh: An initialized holder for the directory glock 271 * @name: The name of the inode to look for 272 * @is_root: If 1, ignore the caller's permissions 273 * @i_gh: An uninitialized holder for the new inode glock 274 * 275 * This can be called via the VFS filldir function when NFS is doing 276 * a readdirplus and the inode which its intending to stat isn't 277 * already in cache. In this case we must not take the directory glock 278 * again, since the readdir call will have already taken that lock. 279 * 280 * Returns: errno 281 */ 282 283 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name, 284 int is_root) 285 { 286 struct super_block *sb = dir->i_sb; 287 struct gfs2_inode *dip = GFS2_I(dir); 288 struct gfs2_holder d_gh; 289 int error = 0; 290 struct inode *inode = NULL; 291 int unlock = 0; 292 293 if (!name->len || name->len > GFS2_FNAMESIZE) 294 return ERR_PTR(-ENAMETOOLONG); 295 296 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) || 297 (name->len == 2 && memcmp(name->name, "..", 2) == 0 && 298 dir == sb->s_root->d_inode)) { 299 igrab(dir); 300 return dir; 301 } 302 303 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) { 304 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); 305 if (error) 306 return ERR_PTR(error); 307 unlock = 1; 308 } 309 310 if (!is_root) { 311 error = gfs2_permission(dir, MAY_EXEC); 312 if (error) 313 goto out; 314 } 315 316 inode = gfs2_dir_search(dir, name, false); 317 if (IS_ERR(inode)) 318 error = PTR_ERR(inode); 319 out: 320 if (unlock) 321 gfs2_glock_dq_uninit(&d_gh); 322 if (error == -ENOENT) 323 return NULL; 324 return inode ? inode : ERR_PTR(error); 325 } 326 327 /** 328 * create_ok - OK to create a new on-disk inode here? 329 * @dip: Directory in which dinode is to be created 330 * @name: Name of new dinode 331 * @mode: 332 * 333 * Returns: errno 334 */ 335 336 static int create_ok(struct gfs2_inode *dip, const struct qstr *name, 337 umode_t mode) 338 { 339 int error; 340 341 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC); 342 if (error) 343 return error; 344 345 /* Don't create entries in an unlinked directory */ 346 if (!dip->i_inode.i_nlink) 347 return -ENOENT; 348 349 if (dip->i_entries == (u32)-1) 350 return -EFBIG; 351 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1) 352 return -EMLINK; 353 354 return 0; 355 } 356 357 static void munge_mode_uid_gid(const struct gfs2_inode *dip, 358 struct inode *inode) 359 { 360 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir && 361 (dip->i_inode.i_mode & S_ISUID) && 362 !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) { 363 if (S_ISDIR(inode->i_mode)) 364 inode->i_mode |= S_ISUID; 365 else if (!uid_eq(dip->i_inode.i_uid, current_fsuid())) 366 inode->i_mode &= ~07111; 367 inode->i_uid = dip->i_inode.i_uid; 368 } else 369 inode->i_uid = current_fsuid(); 370 371 if (dip->i_inode.i_mode & S_ISGID) { 372 if (S_ISDIR(inode->i_mode)) 373 inode->i_mode |= S_ISGID; 374 inode->i_gid = dip->i_inode.i_gid; 375 } else 376 inode->i_gid = current_fsgid(); 377 } 378 379 static int alloc_dinode(struct gfs2_inode *ip, u32 flags) 380 { 381 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 382 int error; 383 int dblocks = 1; 384 385 error = gfs2_quota_lock_check(ip); 386 if (error) 387 goto out; 388 389 error = gfs2_inplace_reserve(ip, RES_DINODE, flags); 390 if (error) 391 goto out_quota; 392 393 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 0); 394 if (error) 395 goto out_ipreserv; 396 397 error = gfs2_alloc_blocks(ip, &ip->i_no_addr, &dblocks, 1, &ip->i_generation); 398 ip->i_no_formal_ino = ip->i_generation; 399 ip->i_inode.i_ino = ip->i_no_addr; 400 ip->i_goal = ip->i_no_addr; 401 402 gfs2_trans_end(sdp); 403 404 out_ipreserv: 405 gfs2_inplace_release(ip); 406 out_quota: 407 gfs2_quota_unlock(ip); 408 out: 409 return error; 410 } 411 412 static void gfs2_init_dir(struct buffer_head *dibh, 413 const struct gfs2_inode *parent) 414 { 415 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data; 416 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1); 417 418 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent); 419 dent->de_inum = di->di_num; /* already GFS2 endian */ 420 dent->de_type = cpu_to_be16(DT_DIR); 421 422 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1)); 423 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent); 424 gfs2_inum_out(parent, dent); 425 dent->de_type = cpu_to_be16(DT_DIR); 426 427 } 428 429 /** 430 * init_dinode - Fill in a new dinode structure 431 * @dip: The directory this inode is being created in 432 * @ip: The inode 433 * @symname: The symlink destination (if a symlink) 434 * @bhp: The buffer head (returned to caller) 435 * 436 */ 437 438 static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip, 439 const char *symname) 440 { 441 struct gfs2_dinode *di; 442 struct buffer_head *dibh; 443 444 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr); 445 gfs2_trans_add_meta(ip->i_gl, dibh); 446 di = (struct gfs2_dinode *)dibh->b_data; 447 gfs2_dinode_out(ip, di); 448 449 di->di_major = cpu_to_be32(MAJOR(ip->i_inode.i_rdev)); 450 di->di_minor = cpu_to_be32(MINOR(ip->i_inode.i_rdev)); 451 di->__pad1 = 0; 452 di->__pad2 = 0; 453 di->__pad3 = 0; 454 memset(&di->__pad4, 0, sizeof(di->__pad4)); 455 memset(&di->di_reserved, 0, sizeof(di->di_reserved)); 456 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); 457 458 switch(ip->i_inode.i_mode & S_IFMT) { 459 case S_IFDIR: 460 gfs2_init_dir(dibh, dip); 461 break; 462 case S_IFLNK: 463 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size); 464 break; 465 } 466 467 set_buffer_uptodate(dibh); 468 brelse(dibh); 469 } 470 471 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, 472 struct gfs2_inode *ip, int arq) 473 { 474 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 475 int error; 476 477 if (arq) { 478 error = gfs2_quota_lock_check(dip); 479 if (error) 480 goto fail_quota_locks; 481 482 error = gfs2_inplace_reserve(dip, sdp->sd_max_dirres, 0); 483 if (error) 484 goto fail_quota_locks; 485 486 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + 487 dip->i_rgd->rd_length + 488 2 * RES_DINODE + 489 RES_STATFS + RES_QUOTA, 0); 490 if (error) 491 goto fail_ipreserv; 492 } else { 493 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); 494 if (error) 495 goto fail_quota_locks; 496 } 497 498 error = gfs2_dir_add(&dip->i_inode, name, ip); 499 if (error) 500 goto fail_end_trans; 501 502 fail_end_trans: 503 gfs2_trans_end(sdp); 504 fail_ipreserv: 505 gfs2_inplace_release(dip); 506 fail_quota_locks: 507 gfs2_quota_unlock(dip); 508 return error; 509 } 510 511 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array, 512 void *fs_info) 513 { 514 const struct xattr *xattr; 515 int err = 0; 516 517 for (xattr = xattr_array; xattr->name != NULL; xattr++) { 518 err = __gfs2_xattr_set(inode, xattr->name, xattr->value, 519 xattr->value_len, 0, 520 GFS2_EATYPE_SECURITY); 521 if (err < 0) 522 break; 523 } 524 return err; 525 } 526 527 static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip, 528 const struct qstr *qstr) 529 { 530 return security_inode_init_security(&ip->i_inode, &dip->i_inode, qstr, 531 &gfs2_initxattrs, NULL); 532 } 533 534 /** 535 * gfs2_create_inode - Create a new inode 536 * @dir: The parent directory 537 * @dentry: The new dentry 538 * @file: If non-NULL, the file which is being opened 539 * @mode: The permissions on the new inode 540 * @dev: For device nodes, this is the device number 541 * @symname: For symlinks, this is the link destination 542 * @size: The initial size of the inode (ignored for directories) 543 * 544 * Returns: 0 on success, or error code 545 */ 546 547 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry, 548 struct file *file, 549 umode_t mode, dev_t dev, const char *symname, 550 unsigned int size, int excl, int *opened) 551 { 552 const struct qstr *name = &dentry->d_name; 553 struct gfs2_holder ghs[2]; 554 struct inode *inode = NULL; 555 struct gfs2_inode *dip = GFS2_I(dir), *ip; 556 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 557 struct gfs2_glock *io_gl; 558 struct dentry *d; 559 int error; 560 u32 aflags = 0; 561 int arq; 562 563 if (!name->len || name->len > GFS2_FNAMESIZE) 564 return -ENAMETOOLONG; 565 566 error = gfs2_rs_alloc(dip); 567 if (error) 568 return error; 569 570 error = gfs2_rindex_update(sdp); 571 if (error) 572 return error; 573 574 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 575 if (error) 576 goto fail; 577 578 error = create_ok(dip, name, mode); 579 if (error) 580 goto fail_gunlock; 581 582 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl); 583 error = PTR_ERR(inode); 584 if (!IS_ERR(inode)) { 585 d = d_splice_alias(inode, dentry); 586 error = 0; 587 if (file) { 588 if (d == NULL) 589 d = dentry; 590 if (S_ISREG(inode->i_mode)) 591 error = finish_open(file, d, gfs2_open_common, opened); 592 else 593 error = finish_no_open(file, d); 594 } 595 gfs2_glock_dq_uninit(ghs); 596 return error; 597 } else if (error != -ENOENT) { 598 goto fail_gunlock; 599 } 600 601 arq = error = gfs2_diradd_alloc_required(dir, name); 602 if (error < 0) 603 goto fail_gunlock; 604 605 inode = new_inode(sdp->sd_vfs); 606 error = -ENOMEM; 607 if (!inode) 608 goto fail_gunlock; 609 610 ip = GFS2_I(inode); 611 error = gfs2_rs_alloc(ip); 612 if (error) 613 goto fail_free_inode; 614 615 inode->i_mode = mode; 616 set_nlink(inode, S_ISDIR(mode) ? 2 : 1); 617 inode->i_rdev = dev; 618 inode->i_size = size; 619 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 620 gfs2_set_inode_blocks(inode, 1); 621 munge_mode_uid_gid(dip, inode); 622 ip->i_goal = dip->i_goal; 623 ip->i_diskflags = 0; 624 ip->i_eattr = 0; 625 ip->i_height = 0; 626 ip->i_depth = 0; 627 ip->i_entries = 0; 628 629 switch(mode & S_IFMT) { 630 case S_IFREG: 631 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) || 632 gfs2_tune_get(sdp, gt_new_files_jdata)) 633 ip->i_diskflags |= GFS2_DIF_JDATA; 634 gfs2_set_aops(inode); 635 break; 636 case S_IFDIR: 637 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA); 638 ip->i_diskflags |= GFS2_DIF_JDATA; 639 ip->i_entries = 2; 640 break; 641 } 642 gfs2_set_inode_flags(inode); 643 644 if ((GFS2_I(sdp->sd_root_dir->d_inode) == dip) || 645 (dip->i_diskflags & GFS2_DIF_TOPDIR)) 646 aflags |= GFS2_AF_ORLOV; 647 648 error = alloc_dinode(ip, aflags); 649 if (error) 650 goto fail_free_inode; 651 652 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); 653 if (error) 654 goto fail_free_inode; 655 656 ip->i_gl->gl_object = ip; 657 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1); 658 if (error) 659 goto fail_free_inode; 660 661 error = gfs2_trans_begin(sdp, RES_DINODE, 0); 662 if (error) 663 goto fail_gunlock2; 664 665 init_dinode(dip, ip, symname); 666 gfs2_trans_end(sdp); 667 668 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl); 669 if (error) 670 goto fail_gunlock2; 671 672 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); 673 if (error) 674 goto fail_gunlock2; 675 676 ip->i_iopen_gh.gh_gl->gl_object = ip; 677 gfs2_glock_put(io_gl); 678 gfs2_set_iop(inode); 679 insert_inode_hash(inode); 680 681 error = gfs2_acl_create(dip, inode); 682 if (error) 683 goto fail_gunlock3; 684 685 error = gfs2_security_init(dip, ip, name); 686 if (error) 687 goto fail_gunlock3; 688 689 error = link_dinode(dip, name, ip, arq); 690 if (error) 691 goto fail_gunlock3; 692 693 mark_inode_dirty(inode); 694 d_instantiate(dentry, inode); 695 if (file) 696 error = finish_open(file, dentry, gfs2_open_common, opened); 697 gfs2_glock_dq_uninit(ghs); 698 gfs2_glock_dq_uninit(ghs + 1); 699 return error; 700 701 fail_gunlock3: 702 gfs2_glock_dq_uninit(ghs + 1); 703 if (ip->i_gl) 704 gfs2_glock_put(ip->i_gl); 705 goto fail_gunlock; 706 707 fail_gunlock2: 708 gfs2_glock_dq_uninit(ghs + 1); 709 fail_free_inode: 710 if (ip->i_gl) 711 gfs2_glock_put(ip->i_gl); 712 gfs2_rs_delete(ip); 713 free_inode_nonrcu(inode); 714 inode = NULL; 715 fail_gunlock: 716 gfs2_glock_dq_uninit(ghs); 717 if (inode && !IS_ERR(inode)) { 718 clear_nlink(inode); 719 mark_inode_dirty(inode); 720 set_bit(GIF_ALLOC_FAILED, &GFS2_I(inode)->i_flags); 721 iput(inode); 722 } 723 fail: 724 return error; 725 } 726 727 /** 728 * gfs2_create - Create a file 729 * @dir: The directory in which to create the file 730 * @dentry: The dentry of the new file 731 * @mode: The mode of the new file 732 * 733 * Returns: errno 734 */ 735 736 static int gfs2_create(struct inode *dir, struct dentry *dentry, 737 umode_t mode, bool excl) 738 { 739 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl, NULL); 740 } 741 742 /** 743 * __gfs2_lookup - Look up a filename in a directory and return its inode 744 * @dir: The directory inode 745 * @dentry: The dentry of the new inode 746 * @file: File to be opened 747 * @opened: atomic_open flags 748 * 749 * 750 * Returns: errno 751 */ 752 753 static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry, 754 struct file *file, int *opened) 755 { 756 struct inode *inode; 757 struct dentry *d; 758 struct gfs2_holder gh; 759 struct gfs2_glock *gl; 760 int error; 761 762 inode = gfs2_lookupi(dir, &dentry->d_name, 0); 763 if (!inode) 764 return NULL; 765 if (IS_ERR(inode)) 766 return ERR_CAST(inode); 767 768 gl = GFS2_I(inode)->i_gl; 769 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 770 if (error) { 771 iput(inode); 772 return ERR_PTR(error); 773 } 774 775 d = d_splice_alias(inode, dentry); 776 if (file && S_ISREG(inode->i_mode)) 777 error = finish_open(file, dentry, gfs2_open_common, opened); 778 779 gfs2_glock_dq_uninit(&gh); 780 if (error) 781 return ERR_PTR(error); 782 return d; 783 } 784 785 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry, 786 unsigned flags) 787 { 788 return __gfs2_lookup(dir, dentry, NULL, NULL); 789 } 790 791 /** 792 * gfs2_link - Link to a file 793 * @old_dentry: The inode to link 794 * @dir: Add link to this directory 795 * @dentry: The name of the link 796 * 797 * Link the inode in "old_dentry" into the directory "dir" with the 798 * name in "dentry". 799 * 800 * Returns: errno 801 */ 802 803 static int gfs2_link(struct dentry *old_dentry, struct inode *dir, 804 struct dentry *dentry) 805 { 806 struct gfs2_inode *dip = GFS2_I(dir); 807 struct gfs2_sbd *sdp = GFS2_SB(dir); 808 struct inode *inode = old_dentry->d_inode; 809 struct gfs2_inode *ip = GFS2_I(inode); 810 struct gfs2_holder ghs[2]; 811 struct buffer_head *dibh; 812 int alloc_required; 813 int error; 814 815 if (S_ISDIR(inode->i_mode)) 816 return -EPERM; 817 818 error = gfs2_rs_alloc(dip); 819 if (error) 820 return error; 821 822 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 823 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); 824 825 error = gfs2_glock_nq(ghs); /* parent */ 826 if (error) 827 goto out_parent; 828 829 error = gfs2_glock_nq(ghs + 1); /* child */ 830 if (error) 831 goto out_child; 832 833 error = -ENOENT; 834 if (inode->i_nlink == 0) 835 goto out_gunlock; 836 837 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC); 838 if (error) 839 goto out_gunlock; 840 841 error = gfs2_dir_check(dir, &dentry->d_name, NULL); 842 switch (error) { 843 case -ENOENT: 844 break; 845 case 0: 846 error = -EEXIST; 847 default: 848 goto out_gunlock; 849 } 850 851 error = -EINVAL; 852 if (!dip->i_inode.i_nlink) 853 goto out_gunlock; 854 error = -EFBIG; 855 if (dip->i_entries == (u32)-1) 856 goto out_gunlock; 857 error = -EPERM; 858 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 859 goto out_gunlock; 860 error = -EINVAL; 861 if (!ip->i_inode.i_nlink) 862 goto out_gunlock; 863 error = -EMLINK; 864 if (ip->i_inode.i_nlink == (u32)-1) 865 goto out_gunlock; 866 867 alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name); 868 if (error < 0) 869 goto out_gunlock; 870 error = 0; 871 872 if (alloc_required) { 873 error = gfs2_quota_lock_check(dip); 874 if (error) 875 goto out_gunlock; 876 877 error = gfs2_inplace_reserve(dip, sdp->sd_max_dirres, 0); 878 if (error) 879 goto out_gunlock_q; 880 881 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + 882 gfs2_rg_blocks(dip, sdp->sd_max_dirres) + 883 2 * RES_DINODE + RES_STATFS + 884 RES_QUOTA, 0); 885 if (error) 886 goto out_ipres; 887 } else { 888 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0); 889 if (error) 890 goto out_ipres; 891 } 892 893 error = gfs2_meta_inode_buffer(ip, &dibh); 894 if (error) 895 goto out_end_trans; 896 897 error = gfs2_dir_add(dir, &dentry->d_name, ip); 898 if (error) 899 goto out_brelse; 900 901 gfs2_trans_add_meta(ip->i_gl, dibh); 902 inc_nlink(&ip->i_inode); 903 ip->i_inode.i_ctime = CURRENT_TIME; 904 ihold(inode); 905 d_instantiate(dentry, inode); 906 mark_inode_dirty(inode); 907 908 out_brelse: 909 brelse(dibh); 910 out_end_trans: 911 gfs2_trans_end(sdp); 912 out_ipres: 913 if (alloc_required) 914 gfs2_inplace_release(dip); 915 out_gunlock_q: 916 if (alloc_required) 917 gfs2_quota_unlock(dip); 918 out_gunlock: 919 gfs2_glock_dq(ghs + 1); 920 out_child: 921 gfs2_glock_dq(ghs); 922 out_parent: 923 gfs2_holder_uninit(ghs); 924 gfs2_holder_uninit(ghs + 1); 925 return error; 926 } 927 928 /* 929 * gfs2_unlink_ok - check to see that a inode is still in a directory 930 * @dip: the directory 931 * @name: the name of the file 932 * @ip: the inode 933 * 934 * Assumes that the lock on (at least) @dip is held. 935 * 936 * Returns: 0 if the parent/child relationship is correct, errno if it isn't 937 */ 938 939 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, 940 const struct gfs2_inode *ip) 941 { 942 int error; 943 944 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) 945 return -EPERM; 946 947 if ((dip->i_inode.i_mode & S_ISVTX) && 948 !uid_eq(dip->i_inode.i_uid, current_fsuid()) && 949 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER)) 950 return -EPERM; 951 952 if (IS_APPEND(&dip->i_inode)) 953 return -EPERM; 954 955 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC); 956 if (error) 957 return error; 958 959 error = gfs2_dir_check(&dip->i_inode, name, ip); 960 if (error) 961 return error; 962 963 return 0; 964 } 965 966 /** 967 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it 968 * @dip: The parent directory 969 * @name: The name of the entry in the parent directory 970 * @inode: The inode to be removed 971 * 972 * Called with all the locks and in a transaction. This will only be 973 * called for a directory after it has been checked to ensure it is empty. 974 * 975 * Returns: 0 on success, or an error 976 */ 977 978 static int gfs2_unlink_inode(struct gfs2_inode *dip, 979 const struct dentry *dentry) 980 { 981 struct inode *inode = dentry->d_inode; 982 struct gfs2_inode *ip = GFS2_I(inode); 983 int error; 984 985 error = gfs2_dir_del(dip, dentry); 986 if (error) 987 return error; 988 989 ip->i_entries = 0; 990 inode->i_ctime = CURRENT_TIME; 991 if (S_ISDIR(inode->i_mode)) 992 clear_nlink(inode); 993 else 994 drop_nlink(inode); 995 mark_inode_dirty(inode); 996 if (inode->i_nlink == 0) 997 gfs2_unlink_di(inode); 998 return 0; 999 } 1000 1001 1002 /** 1003 * gfs2_unlink - Unlink an inode (this does rmdir as well) 1004 * @dir: The inode of the directory containing the inode to unlink 1005 * @dentry: The file itself 1006 * 1007 * This routine uses the type of the inode as a flag to figure out 1008 * whether this is an unlink or an rmdir. 1009 * 1010 * Returns: errno 1011 */ 1012 1013 static int gfs2_unlink(struct inode *dir, struct dentry *dentry) 1014 { 1015 struct gfs2_inode *dip = GFS2_I(dir); 1016 struct gfs2_sbd *sdp = GFS2_SB(dir); 1017 struct inode *inode = dentry->d_inode; 1018 struct gfs2_inode *ip = GFS2_I(inode); 1019 struct gfs2_holder ghs[3]; 1020 struct gfs2_rgrpd *rgd; 1021 int error; 1022 1023 error = gfs2_rindex_update(sdp); 1024 if (error) 1025 return error; 1026 1027 error = -EROFS; 1028 1029 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 1030 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); 1031 1032 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1); 1033 if (!rgd) 1034 goto out_inodes; 1035 1036 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2); 1037 1038 1039 error = gfs2_glock_nq(ghs); /* parent */ 1040 if (error) 1041 goto out_parent; 1042 1043 error = gfs2_glock_nq(ghs + 1); /* child */ 1044 if (error) 1045 goto out_child; 1046 1047 error = -ENOENT; 1048 if (inode->i_nlink == 0) 1049 goto out_rgrp; 1050 1051 if (S_ISDIR(inode->i_mode)) { 1052 error = -ENOTEMPTY; 1053 if (ip->i_entries > 2 || inode->i_nlink > 2) 1054 goto out_rgrp; 1055 } 1056 1057 error = gfs2_glock_nq(ghs + 2); /* rgrp */ 1058 if (error) 1059 goto out_rgrp; 1060 1061 error = gfs2_unlink_ok(dip, &dentry->d_name, ip); 1062 if (error) 1063 goto out_gunlock; 1064 1065 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0); 1066 if (error) 1067 goto out_end_trans; 1068 1069 error = gfs2_unlink_inode(dip, dentry); 1070 1071 out_end_trans: 1072 gfs2_trans_end(sdp); 1073 out_gunlock: 1074 gfs2_glock_dq(ghs + 2); 1075 out_rgrp: 1076 gfs2_glock_dq(ghs + 1); 1077 out_child: 1078 gfs2_glock_dq(ghs); 1079 out_parent: 1080 gfs2_holder_uninit(ghs + 2); 1081 out_inodes: 1082 gfs2_holder_uninit(ghs + 1); 1083 gfs2_holder_uninit(ghs); 1084 return error; 1085 } 1086 1087 /** 1088 * gfs2_symlink - Create a symlink 1089 * @dir: The directory to create the symlink in 1090 * @dentry: The dentry to put the symlink in 1091 * @symname: The thing which the link points to 1092 * 1093 * Returns: errno 1094 */ 1095 1096 static int gfs2_symlink(struct inode *dir, struct dentry *dentry, 1097 const char *symname) 1098 { 1099 struct gfs2_sbd *sdp = GFS2_SB(dir); 1100 unsigned int size; 1101 1102 size = strlen(symname); 1103 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1) 1104 return -ENAMETOOLONG; 1105 1106 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0, NULL); 1107 } 1108 1109 /** 1110 * gfs2_mkdir - Make a directory 1111 * @dir: The parent directory of the new one 1112 * @dentry: The dentry of the new directory 1113 * @mode: The mode of the new directory 1114 * 1115 * Returns: errno 1116 */ 1117 1118 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 1119 { 1120 struct gfs2_sbd *sdp = GFS2_SB(dir); 1121 unsigned dsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode); 1122 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0, NULL); 1123 } 1124 1125 /** 1126 * gfs2_mknod - Make a special file 1127 * @dir: The directory in which the special file will reside 1128 * @dentry: The dentry of the special file 1129 * @mode: The mode of the special file 1130 * @dev: The device specification of the special file 1131 * 1132 */ 1133 1134 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, 1135 dev_t dev) 1136 { 1137 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0, NULL); 1138 } 1139 1140 /** 1141 * gfs2_atomic_open - Atomically open a file 1142 * @dir: The directory 1143 * @dentry: The proposed new entry 1144 * @file: The proposed new struct file 1145 * @flags: open flags 1146 * @mode: File mode 1147 * @opened: Flag to say whether the file has been opened or not 1148 * 1149 * Returns: error code or 0 for success 1150 */ 1151 1152 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry, 1153 struct file *file, unsigned flags, 1154 umode_t mode, int *opened) 1155 { 1156 struct dentry *d; 1157 bool excl = !!(flags & O_EXCL); 1158 1159 d = __gfs2_lookup(dir, dentry, file, opened); 1160 if (IS_ERR(d)) 1161 return PTR_ERR(d); 1162 if (d == NULL) 1163 d = dentry; 1164 if (d->d_inode) { 1165 if (!(*opened & FILE_OPENED)) 1166 return finish_no_open(file, d); 1167 return 0; 1168 } 1169 1170 if (!(flags & O_CREAT)) 1171 return -ENOENT; 1172 1173 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl, opened); 1174 } 1175 1176 /* 1177 * gfs2_ok_to_move - check if it's ok to move a directory to another directory 1178 * @this: move this 1179 * @to: to here 1180 * 1181 * Follow @to back to the root and make sure we don't encounter @this 1182 * Assumes we already hold the rename lock. 1183 * 1184 * Returns: errno 1185 */ 1186 1187 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) 1188 { 1189 struct inode *dir = &to->i_inode; 1190 struct super_block *sb = dir->i_sb; 1191 struct inode *tmp; 1192 int error = 0; 1193 1194 igrab(dir); 1195 1196 for (;;) { 1197 if (dir == &this->i_inode) { 1198 error = -EINVAL; 1199 break; 1200 } 1201 if (dir == sb->s_root->d_inode) { 1202 error = 0; 1203 break; 1204 } 1205 1206 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1); 1207 if (IS_ERR(tmp)) { 1208 error = PTR_ERR(tmp); 1209 break; 1210 } 1211 1212 iput(dir); 1213 dir = tmp; 1214 } 1215 1216 iput(dir); 1217 1218 return error; 1219 } 1220 1221 /** 1222 * gfs2_rename - Rename a file 1223 * @odir: Parent directory of old file name 1224 * @odentry: The old dentry of the file 1225 * @ndir: Parent directory of new file name 1226 * @ndentry: The new dentry of the file 1227 * 1228 * Returns: errno 1229 */ 1230 1231 static int gfs2_rename(struct inode *odir, struct dentry *odentry, 1232 struct inode *ndir, struct dentry *ndentry) 1233 { 1234 struct gfs2_inode *odip = GFS2_I(odir); 1235 struct gfs2_inode *ndip = GFS2_I(ndir); 1236 struct gfs2_inode *ip = GFS2_I(odentry->d_inode); 1237 struct gfs2_inode *nip = NULL; 1238 struct gfs2_sbd *sdp = GFS2_SB(odir); 1239 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, }; 1240 struct gfs2_rgrpd *nrgd; 1241 unsigned int num_gh; 1242 int dir_rename = 0; 1243 int alloc_required = 0; 1244 unsigned int x; 1245 int error; 1246 1247 if (ndentry->d_inode) { 1248 nip = GFS2_I(ndentry->d_inode); 1249 if (ip == nip) 1250 return 0; 1251 } 1252 1253 error = gfs2_rindex_update(sdp); 1254 if (error) 1255 return error; 1256 1257 error = gfs2_rs_alloc(ndip); 1258 if (error) 1259 return error; 1260 1261 if (odip != ndip) { 1262 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 1263 0, &r_gh); 1264 if (error) 1265 goto out; 1266 1267 if (S_ISDIR(ip->i_inode.i_mode)) { 1268 dir_rename = 1; 1269 /* don't move a dirctory into it's subdir */ 1270 error = gfs2_ok_to_move(ip, ndip); 1271 if (error) 1272 goto out_gunlock_r; 1273 } 1274 } 1275 1276 num_gh = 1; 1277 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 1278 if (odip != ndip) { 1279 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1280 num_gh++; 1281 } 1282 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1283 num_gh++; 1284 1285 if (nip) { 1286 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1287 num_gh++; 1288 /* grab the resource lock for unlink flag twiddling 1289 * this is the case of the target file already existing 1290 * so we unlink before doing the rename 1291 */ 1292 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1); 1293 if (nrgd) 1294 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++); 1295 } 1296 1297 for (x = 0; x < num_gh; x++) { 1298 error = gfs2_glock_nq(ghs + x); 1299 if (error) 1300 goto out_gunlock; 1301 } 1302 1303 error = -ENOENT; 1304 if (ip->i_inode.i_nlink == 0) 1305 goto out_gunlock; 1306 1307 /* Check out the old directory */ 1308 1309 error = gfs2_unlink_ok(odip, &odentry->d_name, ip); 1310 if (error) 1311 goto out_gunlock; 1312 1313 /* Check out the new directory */ 1314 1315 if (nip) { 1316 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); 1317 if (error) 1318 goto out_gunlock; 1319 1320 if (nip->i_inode.i_nlink == 0) { 1321 error = -EAGAIN; 1322 goto out_gunlock; 1323 } 1324 1325 if (S_ISDIR(nip->i_inode.i_mode)) { 1326 if (nip->i_entries < 2) { 1327 gfs2_consist_inode(nip); 1328 error = -EIO; 1329 goto out_gunlock; 1330 } 1331 if (nip->i_entries > 2) { 1332 error = -ENOTEMPTY; 1333 goto out_gunlock; 1334 } 1335 } 1336 } else { 1337 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC); 1338 if (error) 1339 goto out_gunlock; 1340 1341 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL); 1342 switch (error) { 1343 case -ENOENT: 1344 error = 0; 1345 break; 1346 case 0: 1347 error = -EEXIST; 1348 default: 1349 goto out_gunlock; 1350 }; 1351 1352 if (odip != ndip) { 1353 if (!ndip->i_inode.i_nlink) { 1354 error = -ENOENT; 1355 goto out_gunlock; 1356 } 1357 if (ndip->i_entries == (u32)-1) { 1358 error = -EFBIG; 1359 goto out_gunlock; 1360 } 1361 if (S_ISDIR(ip->i_inode.i_mode) && 1362 ndip->i_inode.i_nlink == (u32)-1) { 1363 error = -EMLINK; 1364 goto out_gunlock; 1365 } 1366 } 1367 } 1368 1369 /* Check out the dir to be renamed */ 1370 1371 if (dir_rename) { 1372 error = gfs2_permission(odentry->d_inode, MAY_WRITE); 1373 if (error) 1374 goto out_gunlock; 1375 } 1376 1377 if (nip == NULL) 1378 alloc_required = gfs2_diradd_alloc_required(ndir, &ndentry->d_name); 1379 error = alloc_required; 1380 if (error < 0) 1381 goto out_gunlock; 1382 1383 if (alloc_required) { 1384 error = gfs2_quota_lock_check(ndip); 1385 if (error) 1386 goto out_gunlock; 1387 1388 error = gfs2_inplace_reserve(ndip, sdp->sd_max_dirres, 0); 1389 if (error) 1390 goto out_gunlock_q; 1391 1392 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + 1393 gfs2_rg_blocks(ndip, sdp->sd_max_dirres) + 1394 4 * RES_DINODE + 4 * RES_LEAF + 1395 RES_STATFS + RES_QUOTA + 4, 0); 1396 if (error) 1397 goto out_ipreserv; 1398 } else { 1399 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 1400 5 * RES_LEAF + 4, 0); 1401 if (error) 1402 goto out_gunlock; 1403 } 1404 1405 /* Remove the target file, if it exists */ 1406 1407 if (nip) 1408 error = gfs2_unlink_inode(ndip, ndentry); 1409 1410 if (dir_rename) { 1411 error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR); 1412 if (error) 1413 goto out_end_trans; 1414 } else { 1415 struct buffer_head *dibh; 1416 error = gfs2_meta_inode_buffer(ip, &dibh); 1417 if (error) 1418 goto out_end_trans; 1419 ip->i_inode.i_ctime = CURRENT_TIME; 1420 gfs2_trans_add_meta(ip->i_gl, dibh); 1421 gfs2_dinode_out(ip, dibh->b_data); 1422 brelse(dibh); 1423 } 1424 1425 error = gfs2_dir_del(odip, odentry); 1426 if (error) 1427 goto out_end_trans; 1428 1429 error = gfs2_dir_add(ndir, &ndentry->d_name, ip); 1430 if (error) 1431 goto out_end_trans; 1432 1433 out_end_trans: 1434 gfs2_trans_end(sdp); 1435 out_ipreserv: 1436 if (alloc_required) 1437 gfs2_inplace_release(ndip); 1438 out_gunlock_q: 1439 if (alloc_required) 1440 gfs2_quota_unlock(ndip); 1441 out_gunlock: 1442 while (x--) { 1443 gfs2_glock_dq(ghs + x); 1444 gfs2_holder_uninit(ghs + x); 1445 } 1446 out_gunlock_r: 1447 if (r_gh.gh_gl) 1448 gfs2_glock_dq_uninit(&r_gh); 1449 out: 1450 return error; 1451 } 1452 1453 /** 1454 * gfs2_follow_link - Follow a symbolic link 1455 * @dentry: The dentry of the link 1456 * @nd: Data that we pass to vfs_follow_link() 1457 * 1458 * This can handle symlinks of any size. 1459 * 1460 * Returns: 0 on success or error code 1461 */ 1462 1463 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd) 1464 { 1465 struct gfs2_inode *ip = GFS2_I(dentry->d_inode); 1466 struct gfs2_holder i_gh; 1467 struct buffer_head *dibh; 1468 unsigned int size; 1469 char *buf; 1470 int error; 1471 1472 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); 1473 error = gfs2_glock_nq(&i_gh); 1474 if (error) { 1475 gfs2_holder_uninit(&i_gh); 1476 nd_set_link(nd, ERR_PTR(error)); 1477 return NULL; 1478 } 1479 1480 size = (unsigned int)i_size_read(&ip->i_inode); 1481 if (size == 0) { 1482 gfs2_consist_inode(ip); 1483 buf = ERR_PTR(-EIO); 1484 goto out; 1485 } 1486 1487 error = gfs2_meta_inode_buffer(ip, &dibh); 1488 if (error) { 1489 buf = ERR_PTR(error); 1490 goto out; 1491 } 1492 1493 buf = kzalloc(size + 1, GFP_NOFS); 1494 if (!buf) 1495 buf = ERR_PTR(-ENOMEM); 1496 else 1497 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size); 1498 brelse(dibh); 1499 out: 1500 gfs2_glock_dq_uninit(&i_gh); 1501 nd_set_link(nd, buf); 1502 return NULL; 1503 } 1504 1505 static void gfs2_put_link(struct dentry *dentry, struct nameidata *nd, void *p) 1506 { 1507 char *s = nd_get_link(nd); 1508 if (!IS_ERR(s)) 1509 kfree(s); 1510 } 1511 1512 /** 1513 * gfs2_permission - 1514 * @inode: The inode 1515 * @mask: The mask to be tested 1516 * @flags: Indicates whether this is an RCU path walk or not 1517 * 1518 * This may be called from the VFS directly, or from within GFS2 with the 1519 * inode locked, so we look to see if the glock is already locked and only 1520 * lock the glock if its not already been done. 1521 * 1522 * Returns: errno 1523 */ 1524 1525 int gfs2_permission(struct inode *inode, int mask) 1526 { 1527 struct gfs2_inode *ip; 1528 struct gfs2_holder i_gh; 1529 int error; 1530 int unlock = 0; 1531 1532 1533 ip = GFS2_I(inode); 1534 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 1535 if (mask & MAY_NOT_BLOCK) 1536 return -ECHILD; 1537 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); 1538 if (error) 1539 return error; 1540 unlock = 1; 1541 } 1542 1543 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode)) 1544 error = -EACCES; 1545 else 1546 error = generic_permission(inode, mask); 1547 if (unlock) 1548 gfs2_glock_dq_uninit(&i_gh); 1549 1550 return error; 1551 } 1552 1553 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1554 { 1555 setattr_copy(inode, attr); 1556 mark_inode_dirty(inode); 1557 return 0; 1558 } 1559 1560 /** 1561 * gfs2_setattr_simple - 1562 * @ip: 1563 * @attr: 1564 * 1565 * Returns: errno 1566 */ 1567 1568 int gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1569 { 1570 int error; 1571 1572 if (current->journal_info) 1573 return __gfs2_setattr_simple(inode, attr); 1574 1575 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0); 1576 if (error) 1577 return error; 1578 1579 error = __gfs2_setattr_simple(inode, attr); 1580 gfs2_trans_end(GFS2_SB(inode)); 1581 return error; 1582 } 1583 1584 static int setattr_chown(struct inode *inode, struct iattr *attr) 1585 { 1586 struct gfs2_inode *ip = GFS2_I(inode); 1587 struct gfs2_sbd *sdp = GFS2_SB(inode); 1588 kuid_t ouid, nuid; 1589 kgid_t ogid, ngid; 1590 int error; 1591 1592 ouid = inode->i_uid; 1593 ogid = inode->i_gid; 1594 nuid = attr->ia_uid; 1595 ngid = attr->ia_gid; 1596 1597 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid)) 1598 ouid = nuid = NO_UID_QUOTA_CHANGE; 1599 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid)) 1600 ogid = ngid = NO_GID_QUOTA_CHANGE; 1601 1602 error = gfs2_quota_lock(ip, nuid, ngid); 1603 if (error) 1604 return error; 1605 1606 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 1607 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 1608 error = gfs2_quota_check(ip, nuid, ngid); 1609 if (error) 1610 goto out_gunlock_q; 1611 } 1612 1613 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0); 1614 if (error) 1615 goto out_gunlock_q; 1616 1617 error = gfs2_setattr_simple(inode, attr); 1618 if (error) 1619 goto out_end_trans; 1620 1621 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 1622 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 1623 u64 blocks = gfs2_get_inode_blocks(&ip->i_inode); 1624 gfs2_quota_change(ip, -blocks, ouid, ogid); 1625 gfs2_quota_change(ip, blocks, nuid, ngid); 1626 } 1627 1628 out_end_trans: 1629 gfs2_trans_end(sdp); 1630 out_gunlock_q: 1631 gfs2_quota_unlock(ip); 1632 return error; 1633 } 1634 1635 /** 1636 * gfs2_setattr - Change attributes on an inode 1637 * @dentry: The dentry which is changing 1638 * @attr: The structure describing the change 1639 * 1640 * The VFS layer wants to change one or more of an inodes attributes. Write 1641 * that change out to disk. 1642 * 1643 * Returns: errno 1644 */ 1645 1646 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr) 1647 { 1648 struct inode *inode = dentry->d_inode; 1649 struct gfs2_inode *ip = GFS2_I(inode); 1650 struct gfs2_holder i_gh; 1651 int error; 1652 1653 error = gfs2_rs_alloc(ip); 1654 if (error) 1655 return error; 1656 1657 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); 1658 if (error) 1659 return error; 1660 1661 error = -EPERM; 1662 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 1663 goto out; 1664 1665 error = inode_change_ok(inode, attr); 1666 if (error) 1667 goto out; 1668 1669 if (attr->ia_valid & ATTR_SIZE) 1670 error = gfs2_setattr_size(inode, attr->ia_size); 1671 else if (attr->ia_valid & (ATTR_UID | ATTR_GID)) 1672 error = setattr_chown(inode, attr); 1673 else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode)) 1674 error = gfs2_acl_chmod(ip, attr); 1675 else 1676 error = gfs2_setattr_simple(inode, attr); 1677 1678 out: 1679 if (!error) 1680 mark_inode_dirty(inode); 1681 gfs2_glock_dq_uninit(&i_gh); 1682 return error; 1683 } 1684 1685 /** 1686 * gfs2_getattr - Read out an inode's attributes 1687 * @mnt: The vfsmount the inode is being accessed from 1688 * @dentry: The dentry to stat 1689 * @stat: The inode's stats 1690 * 1691 * This may be called from the VFS directly, or from within GFS2 with the 1692 * inode locked, so we look to see if the glock is already locked and only 1693 * lock the glock if its not already been done. Note that its the NFS 1694 * readdirplus operation which causes this to be called (from filldir) 1695 * with the glock already held. 1696 * 1697 * Returns: errno 1698 */ 1699 1700 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry, 1701 struct kstat *stat) 1702 { 1703 struct inode *inode = dentry->d_inode; 1704 struct gfs2_inode *ip = GFS2_I(inode); 1705 struct gfs2_holder gh; 1706 int error; 1707 int unlock = 0; 1708 1709 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 1710 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 1711 if (error) 1712 return error; 1713 unlock = 1; 1714 } 1715 1716 generic_fillattr(inode, stat); 1717 if (unlock) 1718 gfs2_glock_dq_uninit(&gh); 1719 1720 return 0; 1721 } 1722 1723 static int gfs2_setxattr(struct dentry *dentry, const char *name, 1724 const void *data, size_t size, int flags) 1725 { 1726 struct inode *inode = dentry->d_inode; 1727 struct gfs2_inode *ip = GFS2_I(inode); 1728 struct gfs2_holder gh; 1729 int ret; 1730 1731 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 1732 ret = gfs2_glock_nq(&gh); 1733 if (ret == 0) { 1734 ret = gfs2_rs_alloc(ip); 1735 if (ret == 0) 1736 ret = generic_setxattr(dentry, name, data, size, flags); 1737 gfs2_glock_dq(&gh); 1738 } 1739 gfs2_holder_uninit(&gh); 1740 return ret; 1741 } 1742 1743 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name, 1744 void *data, size_t size) 1745 { 1746 struct inode *inode = dentry->d_inode; 1747 struct gfs2_inode *ip = GFS2_I(inode); 1748 struct gfs2_holder gh; 1749 int ret; 1750 1751 /* For selinux during lookup */ 1752 if (gfs2_glock_is_locked_by_me(ip->i_gl)) 1753 return generic_getxattr(dentry, name, data, size); 1754 1755 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 1756 ret = gfs2_glock_nq(&gh); 1757 if (ret == 0) { 1758 ret = generic_getxattr(dentry, name, data, size); 1759 gfs2_glock_dq(&gh); 1760 } 1761 gfs2_holder_uninit(&gh); 1762 return ret; 1763 } 1764 1765 static int gfs2_removexattr(struct dentry *dentry, const char *name) 1766 { 1767 struct inode *inode = dentry->d_inode; 1768 struct gfs2_inode *ip = GFS2_I(inode); 1769 struct gfs2_holder gh; 1770 int ret; 1771 1772 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 1773 ret = gfs2_glock_nq(&gh); 1774 if (ret == 0) { 1775 ret = gfs2_rs_alloc(ip); 1776 if (ret == 0) 1777 ret = generic_removexattr(dentry, name); 1778 gfs2_glock_dq(&gh); 1779 } 1780 gfs2_holder_uninit(&gh); 1781 return ret; 1782 } 1783 1784 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 1785 u64 start, u64 len) 1786 { 1787 struct gfs2_inode *ip = GFS2_I(inode); 1788 struct gfs2_holder gh; 1789 int ret; 1790 1791 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC); 1792 if (ret) 1793 return ret; 1794 1795 mutex_lock(&inode->i_mutex); 1796 1797 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 1798 if (ret) 1799 goto out; 1800 1801 if (gfs2_is_stuffed(ip)) { 1802 u64 phys = ip->i_no_addr << inode->i_blkbits; 1803 u64 size = i_size_read(inode); 1804 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED| 1805 FIEMAP_EXTENT_DATA_INLINE; 1806 phys += sizeof(struct gfs2_dinode); 1807 phys += start; 1808 if (start + len > size) 1809 len = size - start; 1810 if (start < size) 1811 ret = fiemap_fill_next_extent(fieinfo, start, phys, 1812 len, flags); 1813 if (ret == 1) 1814 ret = 0; 1815 } else { 1816 ret = __generic_block_fiemap(inode, fieinfo, start, len, 1817 gfs2_block_map); 1818 } 1819 1820 gfs2_glock_dq_uninit(&gh); 1821 out: 1822 mutex_unlock(&inode->i_mutex); 1823 return ret; 1824 } 1825 1826 const struct inode_operations gfs2_file_iops = { 1827 .permission = gfs2_permission, 1828 .setattr = gfs2_setattr, 1829 .getattr = gfs2_getattr, 1830 .setxattr = gfs2_setxattr, 1831 .getxattr = gfs2_getxattr, 1832 .listxattr = gfs2_listxattr, 1833 .removexattr = gfs2_removexattr, 1834 .fiemap = gfs2_fiemap, 1835 .get_acl = gfs2_get_acl, 1836 }; 1837 1838 const struct inode_operations gfs2_dir_iops = { 1839 .create = gfs2_create, 1840 .lookup = gfs2_lookup, 1841 .link = gfs2_link, 1842 .unlink = gfs2_unlink, 1843 .symlink = gfs2_symlink, 1844 .mkdir = gfs2_mkdir, 1845 .rmdir = gfs2_unlink, 1846 .mknod = gfs2_mknod, 1847 .rename = gfs2_rename, 1848 .permission = gfs2_permission, 1849 .setattr = gfs2_setattr, 1850 .getattr = gfs2_getattr, 1851 .setxattr = gfs2_setxattr, 1852 .getxattr = gfs2_getxattr, 1853 .listxattr = gfs2_listxattr, 1854 .removexattr = gfs2_removexattr, 1855 .fiemap = gfs2_fiemap, 1856 .get_acl = gfs2_get_acl, 1857 .atomic_open = gfs2_atomic_open, 1858 }; 1859 1860 const struct inode_operations gfs2_symlink_iops = { 1861 .readlink = generic_readlink, 1862 .follow_link = gfs2_follow_link, 1863 .put_link = gfs2_put_link, 1864 .permission = gfs2_permission, 1865 .setattr = gfs2_setattr, 1866 .getattr = gfs2_getattr, 1867 .setxattr = gfs2_setxattr, 1868 .getxattr = gfs2_getxattr, 1869 .listxattr = gfs2_listxattr, 1870 .removexattr = gfs2_removexattr, 1871 .fiemap = gfs2_fiemap, 1872 .get_acl = gfs2_get_acl, 1873 }; 1874 1875