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