1 /* 2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 3 * Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved. 4 * 5 * This copyrighted material is made available to anyone wishing to use, 6 * modify, copy, or redistribute it subject to the terms and conditions 7 * of the GNU General Public License version 2. 8 */ 9 10 #include <linux/slab.h> 11 #include <linux/spinlock.h> 12 #include <linux/completion.h> 13 #include <linux/buffer_head.h> 14 #include <linux/namei.h> 15 #include <linux/mm.h> 16 #include <linux/xattr.h> 17 #include <linux/posix_acl.h> 18 #include <linux/gfs2_ondisk.h> 19 #include <linux/crc32.h> 20 #include <linux/fiemap.h> 21 #include <linux/security.h> 22 #include <asm/uaccess.h> 23 24 #include "gfs2.h" 25 #include "incore.h" 26 #include "acl.h" 27 #include "bmap.h" 28 #include "dir.h" 29 #include "xattr.h" 30 #include "glock.h" 31 #include "inode.h" 32 #include "meta_io.h" 33 #include "quota.h" 34 #include "rgrp.h" 35 #include "trans.h" 36 #include "util.h" 37 #include "super.h" 38 #include "glops.h" 39 40 struct gfs2_skip_data { 41 u64 no_addr; 42 int skipped; 43 int non_block; 44 }; 45 46 static int iget_test(struct inode *inode, void *opaque) 47 { 48 struct gfs2_inode *ip = GFS2_I(inode); 49 struct gfs2_skip_data *data = opaque; 50 51 if (ip->i_no_addr == data->no_addr) { 52 if (data->non_block && 53 inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE)) { 54 data->skipped = 1; 55 return 0; 56 } 57 return 1; 58 } 59 return 0; 60 } 61 62 static int iget_set(struct inode *inode, void *opaque) 63 { 64 struct gfs2_inode *ip = GFS2_I(inode); 65 struct gfs2_skip_data *data = opaque; 66 67 if (data->skipped) 68 return -ENOENT; 69 inode->i_ino = (unsigned long)(data->no_addr); 70 ip->i_no_addr = data->no_addr; 71 return 0; 72 } 73 74 struct inode *gfs2_ilookup(struct super_block *sb, u64 no_addr, int non_block) 75 { 76 unsigned long hash = (unsigned long)no_addr; 77 struct gfs2_skip_data data; 78 79 data.no_addr = no_addr; 80 data.skipped = 0; 81 data.non_block = non_block; 82 return ilookup5(sb, hash, iget_test, &data); 83 } 84 85 static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr, 86 int non_block) 87 { 88 struct gfs2_skip_data data; 89 unsigned long hash = (unsigned long)no_addr; 90 91 data.no_addr = no_addr; 92 data.skipped = 0; 93 data.non_block = non_block; 94 return iget5_locked(sb, hash, iget_test, iget_set, &data); 95 } 96 97 /** 98 * gfs2_set_iop - Sets inode operations 99 * @inode: The inode with correct i_mode filled in 100 * 101 * GFS2 lookup code fills in vfs inode contents based on info obtained 102 * from directory entry inside gfs2_inode_lookup(). 103 */ 104 105 static void gfs2_set_iop(struct inode *inode) 106 { 107 struct gfs2_sbd *sdp = GFS2_SB(inode); 108 umode_t mode = inode->i_mode; 109 110 if (S_ISREG(mode)) { 111 inode->i_op = &gfs2_file_iops; 112 if (gfs2_localflocks(sdp)) 113 inode->i_fop = &gfs2_file_fops_nolock; 114 else 115 inode->i_fop = &gfs2_file_fops; 116 } else if (S_ISDIR(mode)) { 117 inode->i_op = &gfs2_dir_iops; 118 if (gfs2_localflocks(sdp)) 119 inode->i_fop = &gfs2_dir_fops_nolock; 120 else 121 inode->i_fop = &gfs2_dir_fops; 122 } else if (S_ISLNK(mode)) { 123 inode->i_op = &gfs2_symlink_iops; 124 } else { 125 inode->i_op = &gfs2_file_iops; 126 init_special_inode(inode, inode->i_mode, inode->i_rdev); 127 } 128 } 129 130 /** 131 * gfs2_inode_lookup - Lookup an inode 132 * @sb: The super block 133 * @no_addr: The inode number 134 * @type: The type of the inode 135 * non_block: Can we block on inodes that are being freed? 136 * 137 * Returns: A VFS inode, or an error 138 */ 139 140 struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type, 141 u64 no_addr, u64 no_formal_ino, int non_block) 142 { 143 struct inode *inode; 144 struct gfs2_inode *ip; 145 struct gfs2_glock *io_gl = NULL; 146 int error; 147 148 inode = gfs2_iget(sb, no_addr, non_block); 149 ip = GFS2_I(inode); 150 151 if (!inode) 152 return ERR_PTR(-ENOMEM); 153 154 if (inode->i_state & I_NEW) { 155 struct gfs2_sbd *sdp = GFS2_SB(inode); 156 ip->i_no_formal_ino = no_formal_ino; 157 158 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); 159 if (unlikely(error)) 160 goto fail; 161 ip->i_gl->gl_object = ip; 162 163 error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl); 164 if (unlikely(error)) 165 goto fail_put; 166 167 set_bit(GIF_INVALID, &ip->i_flags); 168 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); 169 if (unlikely(error)) 170 goto fail_iopen; 171 172 ip->i_iopen_gh.gh_gl->gl_object = ip; 173 gfs2_glock_put(io_gl); 174 io_gl = NULL; 175 176 if (type == DT_UNKNOWN) { 177 /* Inode glock must be locked already */ 178 error = gfs2_inode_refresh(GFS2_I(inode)); 179 if (error) 180 goto fail_refresh; 181 } else { 182 inode->i_mode = DT2IF(type); 183 } 184 185 gfs2_set_iop(inode); 186 unlock_new_inode(inode); 187 } 188 189 return inode; 190 191 fail_refresh: 192 ip->i_iopen_gh.gh_flags |= GL_NOCACHE; 193 ip->i_iopen_gh.gh_gl->gl_object = NULL; 194 gfs2_glock_dq_uninit(&ip->i_iopen_gh); 195 fail_iopen: 196 if (io_gl) 197 gfs2_glock_put(io_gl); 198 fail_put: 199 ip->i_gl->gl_object = NULL; 200 gfs2_glock_put(ip->i_gl); 201 fail: 202 iget_failed(inode); 203 return ERR_PTR(error); 204 } 205 206 struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr, 207 u64 *no_formal_ino, unsigned int blktype) 208 { 209 struct super_block *sb = sdp->sd_vfs; 210 struct gfs2_holder i_gh; 211 struct inode *inode = NULL; 212 int error; 213 214 /* Must not read in block until block type is verified */ 215 error = gfs2_glock_nq_num(sdp, no_addr, &gfs2_inode_glops, 216 LM_ST_EXCLUSIVE, GL_SKIP, &i_gh); 217 if (error) 218 return ERR_PTR(error); 219 220 error = gfs2_check_blk_type(sdp, no_addr, blktype); 221 if (error) 222 goto fail; 223 224 inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, 0, 1); 225 if (IS_ERR(inode)) 226 goto fail; 227 228 /* Two extra checks for NFS only */ 229 if (no_formal_ino) { 230 error = -ESTALE; 231 if (GFS2_I(inode)->i_no_formal_ino != *no_formal_ino) 232 goto fail_iput; 233 234 error = -EIO; 235 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM) 236 goto fail_iput; 237 238 error = 0; 239 } 240 241 fail: 242 gfs2_glock_dq_uninit(&i_gh); 243 return error ? ERR_PTR(error) : inode; 244 fail_iput: 245 iput(inode); 246 goto fail; 247 } 248 249 250 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name) 251 { 252 struct qstr qstr; 253 struct inode *inode; 254 gfs2_str2qstr(&qstr, name); 255 inode = gfs2_lookupi(dip, &qstr, 1); 256 /* gfs2_lookupi has inconsistent callers: vfs 257 * related routines expect NULL for no entry found, 258 * gfs2_lookup_simple callers expect ENOENT 259 * and do not check for NULL. 260 */ 261 if (inode == NULL) 262 return ERR_PTR(-ENOENT); 263 else 264 return inode; 265 } 266 267 268 /** 269 * gfs2_lookupi - Look up a filename in a directory and return its inode 270 * @d_gh: An initialized holder for the directory glock 271 * @name: The name of the inode to look for 272 * @is_root: If 1, ignore the caller's permissions 273 * @i_gh: An uninitialized holder for the new inode glock 274 * 275 * This can be called via the VFS filldir function when NFS is doing 276 * a readdirplus and the inode which its intending to stat isn't 277 * already in cache. In this case we must not take the directory glock 278 * again, since the readdir call will have already taken that lock. 279 * 280 * Returns: errno 281 */ 282 283 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name, 284 int is_root) 285 { 286 struct super_block *sb = dir->i_sb; 287 struct gfs2_inode *dip = GFS2_I(dir); 288 struct gfs2_holder d_gh; 289 int error = 0; 290 struct inode *inode = NULL; 291 int unlock = 0; 292 293 if (!name->len || name->len > GFS2_FNAMESIZE) 294 return ERR_PTR(-ENAMETOOLONG); 295 296 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) || 297 (name->len == 2 && memcmp(name->name, "..", 2) == 0 && 298 dir == sb->s_root->d_inode)) { 299 igrab(dir); 300 return dir; 301 } 302 303 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) { 304 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); 305 if (error) 306 return ERR_PTR(error); 307 unlock = 1; 308 } 309 310 if (!is_root) { 311 error = gfs2_permission(dir, MAY_EXEC); 312 if (error) 313 goto out; 314 } 315 316 inode = gfs2_dir_search(dir, name, false); 317 if (IS_ERR(inode)) 318 error = PTR_ERR(inode); 319 out: 320 if (unlock) 321 gfs2_glock_dq_uninit(&d_gh); 322 if (error == -ENOENT) 323 return NULL; 324 return inode ? inode : ERR_PTR(error); 325 } 326 327 /** 328 * create_ok - OK to create a new on-disk inode here? 329 * @dip: Directory in which dinode is to be created 330 * @name: Name of new dinode 331 * @mode: 332 * 333 * Returns: errno 334 */ 335 336 static int create_ok(struct gfs2_inode *dip, const struct qstr *name, 337 umode_t mode) 338 { 339 int error; 340 341 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC); 342 if (error) 343 return error; 344 345 /* Don't create entries in an unlinked directory */ 346 if (!dip->i_inode.i_nlink) 347 return -ENOENT; 348 349 if (dip->i_entries == (u32)-1) 350 return -EFBIG; 351 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1) 352 return -EMLINK; 353 354 return 0; 355 } 356 357 static void munge_mode_uid_gid(const struct gfs2_inode *dip, 358 struct inode *inode) 359 { 360 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir && 361 (dip->i_inode.i_mode & S_ISUID) && 362 !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) { 363 if (S_ISDIR(inode->i_mode)) 364 inode->i_mode |= S_ISUID; 365 else if (!uid_eq(dip->i_inode.i_uid, current_fsuid())) 366 inode->i_mode &= ~07111; 367 inode->i_uid = dip->i_inode.i_uid; 368 } else 369 inode->i_uid = current_fsuid(); 370 371 if (dip->i_inode.i_mode & S_ISGID) { 372 if (S_ISDIR(inode->i_mode)) 373 inode->i_mode |= S_ISGID; 374 inode->i_gid = dip->i_inode.i_gid; 375 } else 376 inode->i_gid = current_fsgid(); 377 } 378 379 static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks) 380 { 381 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 382 struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, }; 383 int error; 384 385 error = gfs2_quota_lock_check(ip); 386 if (error) 387 goto out; 388 389 error = gfs2_inplace_reserve(ip, &ap); 390 if (error) 391 goto out_quota; 392 393 error = gfs2_trans_begin(sdp, (*dblocks * 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 * gfs2_init_xattr - Initialise an xattr block for a new inode 431 * @ip: The inode in question 432 * 433 * This sets up an empty xattr block for a new inode, ready to 434 * take any ACLs, LSM xattrs, etc. 435 */ 436 437 static void gfs2_init_xattr(struct gfs2_inode *ip) 438 { 439 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 440 struct buffer_head *bh; 441 struct gfs2_ea_header *ea; 442 443 bh = gfs2_meta_new(ip->i_gl, ip->i_eattr); 444 gfs2_trans_add_meta(ip->i_gl, bh); 445 gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA); 446 gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header)); 447 448 ea = GFS2_EA_BH2FIRST(bh); 449 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize); 450 ea->ea_type = GFS2_EATYPE_UNUSED; 451 ea->ea_flags = GFS2_EAFLAG_LAST; 452 453 brelse(bh); 454 } 455 456 /** 457 * init_dinode - Fill in a new dinode structure 458 * @dip: The directory this inode is being created in 459 * @ip: The inode 460 * @symname: The symlink destination (if a symlink) 461 * @bhp: The buffer head (returned to caller) 462 * 463 */ 464 465 static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip, 466 const char *symname) 467 { 468 struct gfs2_dinode *di; 469 struct buffer_head *dibh; 470 471 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr); 472 gfs2_trans_add_meta(ip->i_gl, dibh); 473 di = (struct gfs2_dinode *)dibh->b_data; 474 gfs2_dinode_out(ip, di); 475 476 di->di_major = cpu_to_be32(MAJOR(ip->i_inode.i_rdev)); 477 di->di_minor = cpu_to_be32(MINOR(ip->i_inode.i_rdev)); 478 di->__pad1 = 0; 479 di->__pad2 = 0; 480 di->__pad3 = 0; 481 memset(&di->__pad4, 0, sizeof(di->__pad4)); 482 memset(&di->di_reserved, 0, sizeof(di->di_reserved)); 483 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); 484 485 switch(ip->i_inode.i_mode & S_IFMT) { 486 case S_IFDIR: 487 gfs2_init_dir(dibh, dip); 488 break; 489 case S_IFLNK: 490 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size); 491 break; 492 } 493 494 set_buffer_uptodate(dibh); 495 brelse(dibh); 496 } 497 498 /** 499 * gfs2_trans_da_blocks - Calculate number of blocks to link inode 500 * @dip: The directory we are linking into 501 * @da: The dir add information 502 * @nr_inodes: The number of inodes involved 503 * 504 * This calculate the number of blocks we need to reserve in a 505 * transaction to link @nr_inodes into a directory. In most cases 506 * @nr_inodes will be 2 (the directory plus the inode being linked in) 507 * but in case of rename, 4 may be required. 508 * 509 * Returns: Number of blocks 510 */ 511 512 static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip, 513 const struct gfs2_diradd *da, 514 unsigned nr_inodes) 515 { 516 return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) + 517 (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS; 518 } 519 520 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, 521 struct gfs2_inode *ip, struct gfs2_diradd *da) 522 { 523 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 524 struct gfs2_alloc_parms ap = { .target = da->nr_blocks, }; 525 int error; 526 527 if (da->nr_blocks) { 528 error = gfs2_quota_lock_check(dip); 529 if (error) 530 goto fail_quota_locks; 531 532 error = gfs2_inplace_reserve(dip, &ap); 533 if (error) 534 goto fail_quota_locks; 535 536 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0); 537 if (error) 538 goto fail_ipreserv; 539 } else { 540 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); 541 if (error) 542 goto fail_quota_locks; 543 } 544 545 error = gfs2_dir_add(&dip->i_inode, name, ip, da); 546 if (error) 547 goto fail_end_trans; 548 549 fail_end_trans: 550 gfs2_trans_end(sdp); 551 fail_ipreserv: 552 gfs2_inplace_release(dip); 553 fail_quota_locks: 554 gfs2_quota_unlock(dip); 555 return error; 556 } 557 558 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array, 559 void *fs_info) 560 { 561 const struct xattr *xattr; 562 int err = 0; 563 564 for (xattr = xattr_array; xattr->name != NULL; xattr++) { 565 err = __gfs2_xattr_set(inode, xattr->name, xattr->value, 566 xattr->value_len, 0, 567 GFS2_EATYPE_SECURITY); 568 if (err < 0) 569 break; 570 } 571 return err; 572 } 573 574 /** 575 * gfs2_create_inode - Create a new inode 576 * @dir: The parent directory 577 * @dentry: The new dentry 578 * @file: If non-NULL, the file which is being opened 579 * @mode: The permissions on the new inode 580 * @dev: For device nodes, this is the device number 581 * @symname: For symlinks, this is the link destination 582 * @size: The initial size of the inode (ignored for directories) 583 * 584 * Returns: 0 on success, or error code 585 */ 586 587 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry, 588 struct file *file, 589 umode_t mode, dev_t dev, const char *symname, 590 unsigned int size, int excl, int *opened) 591 { 592 const struct qstr *name = &dentry->d_name; 593 struct posix_acl *default_acl, *acl; 594 struct gfs2_holder ghs[2]; 595 struct inode *inode = NULL; 596 struct gfs2_inode *dip = GFS2_I(dir), *ip; 597 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 598 struct gfs2_glock *io_gl; 599 int error, free_vfs_inode = 0; 600 u32 aflags = 0; 601 unsigned blocks = 1; 602 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, }; 603 604 if (!name->len || name->len > GFS2_FNAMESIZE) 605 return -ENAMETOOLONG; 606 607 error = gfs2_rs_alloc(dip); 608 if (error) 609 return error; 610 611 error = gfs2_rindex_update(sdp); 612 if (error) 613 return error; 614 615 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 616 if (error) 617 goto fail; 618 619 error = create_ok(dip, name, mode); 620 if (error) 621 goto fail_gunlock; 622 623 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl); 624 error = PTR_ERR(inode); 625 if (!IS_ERR(inode)) { 626 if (S_ISDIR(inode->i_mode)) { 627 iput(inode); 628 inode = ERR_PTR(-EISDIR); 629 goto fail_gunlock; 630 } 631 d_instantiate(dentry, inode); 632 error = 0; 633 if (file) { 634 if (S_ISREG(inode->i_mode)) 635 error = finish_open(file, dentry, gfs2_open_common, opened); 636 else 637 error = finish_no_open(file, NULL); 638 } 639 gfs2_glock_dq_uninit(ghs); 640 return error; 641 } else if (error != -ENOENT) { 642 goto fail_gunlock; 643 } 644 645 error = gfs2_diradd_alloc_required(dir, name, &da); 646 if (error < 0) 647 goto fail_gunlock; 648 649 inode = new_inode(sdp->sd_vfs); 650 error = -ENOMEM; 651 if (!inode) 652 goto fail_gunlock; 653 654 error = posix_acl_create(dir, &mode, &default_acl, &acl); 655 if (error) 656 goto fail_free_vfs_inode; 657 658 ip = GFS2_I(inode); 659 error = gfs2_rs_alloc(ip); 660 if (error) 661 goto fail_free_acls; 662 663 inode->i_mode = mode; 664 set_nlink(inode, S_ISDIR(mode) ? 2 : 1); 665 inode->i_rdev = dev; 666 inode->i_size = size; 667 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 668 gfs2_set_inode_blocks(inode, 1); 669 munge_mode_uid_gid(dip, inode); 670 check_and_update_goal(dip); 671 ip->i_goal = dip->i_goal; 672 ip->i_diskflags = 0; 673 ip->i_eattr = 0; 674 ip->i_height = 0; 675 ip->i_depth = 0; 676 ip->i_entries = 0; 677 678 switch(mode & S_IFMT) { 679 case S_IFREG: 680 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) || 681 gfs2_tune_get(sdp, gt_new_files_jdata)) 682 ip->i_diskflags |= GFS2_DIF_JDATA; 683 gfs2_set_aops(inode); 684 break; 685 case S_IFDIR: 686 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA); 687 ip->i_diskflags |= GFS2_DIF_JDATA; 688 ip->i_entries = 2; 689 break; 690 } 691 gfs2_set_inode_flags(inode); 692 693 if ((GFS2_I(sdp->sd_root_dir->d_inode) == dip) || 694 (dip->i_diskflags & GFS2_DIF_TOPDIR)) 695 aflags |= GFS2_AF_ORLOV; 696 697 if (default_acl || acl) 698 blocks++; 699 700 error = alloc_dinode(ip, aflags, &blocks); 701 if (error) 702 goto fail_free_inode; 703 704 gfs2_set_inode_blocks(inode, blocks); 705 706 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); 707 if (error) 708 goto fail_free_inode; 709 710 ip->i_gl->gl_object = ip; 711 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1); 712 if (error) 713 goto fail_free_inode; 714 715 error = gfs2_trans_begin(sdp, blocks, 0); 716 if (error) 717 goto fail_gunlock2; 718 719 if (blocks > 1) { 720 ip->i_eattr = ip->i_no_addr + 1; 721 gfs2_init_xattr(ip); 722 } 723 init_dinode(dip, ip, symname); 724 gfs2_trans_end(sdp); 725 726 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl); 727 if (error) 728 goto fail_gunlock2; 729 730 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); 731 if (error) 732 goto fail_gunlock2; 733 734 ip->i_iopen_gh.gh_gl->gl_object = ip; 735 gfs2_glock_put(io_gl); 736 gfs2_set_iop(inode); 737 insert_inode_hash(inode); 738 739 if (default_acl) { 740 error = gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT); 741 posix_acl_release(default_acl); 742 } 743 if (acl) { 744 if (!error) 745 error = gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS); 746 posix_acl_release(acl); 747 } 748 749 if (error) 750 goto fail_gunlock3; 751 752 error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name, 753 &gfs2_initxattrs, NULL); 754 if (error) 755 goto fail_gunlock3; 756 757 error = link_dinode(dip, name, ip, &da); 758 if (error) 759 goto fail_gunlock3; 760 761 mark_inode_dirty(inode); 762 d_instantiate(dentry, inode); 763 if (file) { 764 *opened |= FILE_CREATED; 765 error = finish_open(file, dentry, gfs2_open_common, opened); 766 } 767 gfs2_glock_dq_uninit(ghs); 768 gfs2_glock_dq_uninit(ghs + 1); 769 return error; 770 771 fail_gunlock3: 772 gfs2_glock_dq_uninit(ghs + 1); 773 if (ip->i_gl) 774 gfs2_glock_put(ip->i_gl); 775 goto fail_gunlock; 776 777 fail_gunlock2: 778 gfs2_glock_dq_uninit(ghs + 1); 779 fail_free_inode: 780 if (ip->i_gl) 781 gfs2_glock_put(ip->i_gl); 782 gfs2_rs_delete(ip, NULL); 783 fail_free_acls: 784 if (default_acl) 785 posix_acl_release(default_acl); 786 if (acl) 787 posix_acl_release(acl); 788 fail_free_vfs_inode: 789 free_vfs_inode = 1; 790 fail_gunlock: 791 gfs2_dir_no_add(&da); 792 gfs2_glock_dq_uninit(ghs); 793 if (inode && !IS_ERR(inode)) { 794 clear_nlink(inode); 795 if (!free_vfs_inode) 796 mark_inode_dirty(inode); 797 set_bit(free_vfs_inode ? GIF_FREE_VFS_INODE : GIF_ALLOC_FAILED, 798 &GFS2_I(inode)->i_flags); 799 iput(inode); 800 } 801 fail: 802 return error; 803 } 804 805 /** 806 * gfs2_create - Create a file 807 * @dir: The directory in which to create the file 808 * @dentry: The dentry of the new file 809 * @mode: The mode of the new file 810 * 811 * Returns: errno 812 */ 813 814 static int gfs2_create(struct inode *dir, struct dentry *dentry, 815 umode_t mode, bool excl) 816 { 817 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl, NULL); 818 } 819 820 /** 821 * __gfs2_lookup - Look up a filename in a directory and return its inode 822 * @dir: The directory inode 823 * @dentry: The dentry of the new inode 824 * @file: File to be opened 825 * @opened: atomic_open flags 826 * 827 * 828 * Returns: errno 829 */ 830 831 static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry, 832 struct file *file, int *opened) 833 { 834 struct inode *inode; 835 struct dentry *d; 836 struct gfs2_holder gh; 837 struct gfs2_glock *gl; 838 int error; 839 840 inode = gfs2_lookupi(dir, &dentry->d_name, 0); 841 if (inode == NULL) { 842 d_add(dentry, NULL); 843 return NULL; 844 } 845 if (IS_ERR(inode)) 846 return ERR_CAST(inode); 847 848 gl = GFS2_I(inode)->i_gl; 849 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 850 if (error) { 851 iput(inode); 852 return ERR_PTR(error); 853 } 854 855 d = d_splice_alias(inode, dentry); 856 if (IS_ERR(d)) { 857 gfs2_glock_dq_uninit(&gh); 858 return d; 859 } 860 if (file && S_ISREG(inode->i_mode)) 861 error = finish_open(file, dentry, gfs2_open_common, opened); 862 863 gfs2_glock_dq_uninit(&gh); 864 if (error) { 865 dput(d); 866 return ERR_PTR(error); 867 } 868 return d; 869 } 870 871 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry, 872 unsigned flags) 873 { 874 return __gfs2_lookup(dir, dentry, NULL, NULL); 875 } 876 877 /** 878 * gfs2_link - Link to a file 879 * @old_dentry: The inode to link 880 * @dir: Add link to this directory 881 * @dentry: The name of the link 882 * 883 * Link the inode in "old_dentry" into the directory "dir" with the 884 * name in "dentry". 885 * 886 * Returns: errno 887 */ 888 889 static int gfs2_link(struct dentry *old_dentry, struct inode *dir, 890 struct dentry *dentry) 891 { 892 struct gfs2_inode *dip = GFS2_I(dir); 893 struct gfs2_sbd *sdp = GFS2_SB(dir); 894 struct inode *inode = old_dentry->d_inode; 895 struct gfs2_inode *ip = GFS2_I(inode); 896 struct gfs2_holder ghs[2]; 897 struct buffer_head *dibh; 898 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, }; 899 int error; 900 901 if (S_ISDIR(inode->i_mode)) 902 return -EPERM; 903 904 error = gfs2_rs_alloc(dip); 905 if (error) 906 return error; 907 908 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 909 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); 910 911 error = gfs2_glock_nq(ghs); /* parent */ 912 if (error) 913 goto out_parent; 914 915 error = gfs2_glock_nq(ghs + 1); /* child */ 916 if (error) 917 goto out_child; 918 919 error = -ENOENT; 920 if (inode->i_nlink == 0) 921 goto out_gunlock; 922 923 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC); 924 if (error) 925 goto out_gunlock; 926 927 error = gfs2_dir_check(dir, &dentry->d_name, NULL); 928 switch (error) { 929 case -ENOENT: 930 break; 931 case 0: 932 error = -EEXIST; 933 default: 934 goto out_gunlock; 935 } 936 937 error = -EINVAL; 938 if (!dip->i_inode.i_nlink) 939 goto out_gunlock; 940 error = -EFBIG; 941 if (dip->i_entries == (u32)-1) 942 goto out_gunlock; 943 error = -EPERM; 944 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 945 goto out_gunlock; 946 error = -EINVAL; 947 if (!ip->i_inode.i_nlink) 948 goto out_gunlock; 949 error = -EMLINK; 950 if (ip->i_inode.i_nlink == (u32)-1) 951 goto out_gunlock; 952 953 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da); 954 if (error < 0) 955 goto out_gunlock; 956 957 if (da.nr_blocks) { 958 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, }; 959 error = gfs2_quota_lock_check(dip); 960 if (error) 961 goto out_gunlock; 962 963 error = gfs2_inplace_reserve(dip, &ap); 964 if (error) 965 goto out_gunlock_q; 966 967 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0); 968 if (error) 969 goto out_ipres; 970 } else { 971 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0); 972 if (error) 973 goto out_ipres; 974 } 975 976 error = gfs2_meta_inode_buffer(ip, &dibh); 977 if (error) 978 goto out_end_trans; 979 980 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da); 981 if (error) 982 goto out_brelse; 983 984 gfs2_trans_add_meta(ip->i_gl, dibh); 985 inc_nlink(&ip->i_inode); 986 ip->i_inode.i_ctime = CURRENT_TIME; 987 ihold(inode); 988 d_instantiate(dentry, inode); 989 mark_inode_dirty(inode); 990 991 out_brelse: 992 brelse(dibh); 993 out_end_trans: 994 gfs2_trans_end(sdp); 995 out_ipres: 996 if (da.nr_blocks) 997 gfs2_inplace_release(dip); 998 out_gunlock_q: 999 if (da.nr_blocks) 1000 gfs2_quota_unlock(dip); 1001 out_gunlock: 1002 gfs2_dir_no_add(&da); 1003 gfs2_glock_dq(ghs + 1); 1004 out_child: 1005 gfs2_glock_dq(ghs); 1006 out_parent: 1007 gfs2_holder_uninit(ghs); 1008 gfs2_holder_uninit(ghs + 1); 1009 return error; 1010 } 1011 1012 /* 1013 * gfs2_unlink_ok - check to see that a inode is still in a directory 1014 * @dip: the directory 1015 * @name: the name of the file 1016 * @ip: the inode 1017 * 1018 * Assumes that the lock on (at least) @dip is held. 1019 * 1020 * Returns: 0 if the parent/child relationship is correct, errno if it isn't 1021 */ 1022 1023 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, 1024 const struct gfs2_inode *ip) 1025 { 1026 int error; 1027 1028 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) 1029 return -EPERM; 1030 1031 if ((dip->i_inode.i_mode & S_ISVTX) && 1032 !uid_eq(dip->i_inode.i_uid, current_fsuid()) && 1033 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER)) 1034 return -EPERM; 1035 1036 if (IS_APPEND(&dip->i_inode)) 1037 return -EPERM; 1038 1039 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC); 1040 if (error) 1041 return error; 1042 1043 return gfs2_dir_check(&dip->i_inode, name, ip); 1044 } 1045 1046 /** 1047 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it 1048 * @dip: The parent directory 1049 * @name: The name of the entry in the parent directory 1050 * @inode: The inode to be removed 1051 * 1052 * Called with all the locks and in a transaction. This will only be 1053 * called for a directory after it has been checked to ensure it is empty. 1054 * 1055 * Returns: 0 on success, or an error 1056 */ 1057 1058 static int gfs2_unlink_inode(struct gfs2_inode *dip, 1059 const struct dentry *dentry) 1060 { 1061 struct inode *inode = dentry->d_inode; 1062 struct gfs2_inode *ip = GFS2_I(inode); 1063 int error; 1064 1065 error = gfs2_dir_del(dip, dentry); 1066 if (error) 1067 return error; 1068 1069 ip->i_entries = 0; 1070 inode->i_ctime = CURRENT_TIME; 1071 if (S_ISDIR(inode->i_mode)) 1072 clear_nlink(inode); 1073 else 1074 drop_nlink(inode); 1075 mark_inode_dirty(inode); 1076 if (inode->i_nlink == 0) 1077 gfs2_unlink_di(inode); 1078 return 0; 1079 } 1080 1081 1082 /** 1083 * gfs2_unlink - Unlink an inode (this does rmdir as well) 1084 * @dir: The inode of the directory containing the inode to unlink 1085 * @dentry: The file itself 1086 * 1087 * This routine uses the type of the inode as a flag to figure out 1088 * whether this is an unlink or an rmdir. 1089 * 1090 * Returns: errno 1091 */ 1092 1093 static int gfs2_unlink(struct inode *dir, struct dentry *dentry) 1094 { 1095 struct gfs2_inode *dip = GFS2_I(dir); 1096 struct gfs2_sbd *sdp = GFS2_SB(dir); 1097 struct inode *inode = dentry->d_inode; 1098 struct gfs2_inode *ip = GFS2_I(inode); 1099 struct gfs2_holder ghs[3]; 1100 struct gfs2_rgrpd *rgd; 1101 int error; 1102 1103 error = gfs2_rindex_update(sdp); 1104 if (error) 1105 return error; 1106 1107 error = -EROFS; 1108 1109 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 1110 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); 1111 1112 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1); 1113 if (!rgd) 1114 goto out_inodes; 1115 1116 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2); 1117 1118 1119 error = gfs2_glock_nq(ghs); /* parent */ 1120 if (error) 1121 goto out_parent; 1122 1123 error = gfs2_glock_nq(ghs + 1); /* child */ 1124 if (error) 1125 goto out_child; 1126 1127 error = -ENOENT; 1128 if (inode->i_nlink == 0) 1129 goto out_rgrp; 1130 1131 if (S_ISDIR(inode->i_mode)) { 1132 error = -ENOTEMPTY; 1133 if (ip->i_entries > 2 || inode->i_nlink > 2) 1134 goto out_rgrp; 1135 } 1136 1137 error = gfs2_glock_nq(ghs + 2); /* rgrp */ 1138 if (error) 1139 goto out_rgrp; 1140 1141 error = gfs2_unlink_ok(dip, &dentry->d_name, ip); 1142 if (error) 1143 goto out_gunlock; 1144 1145 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0); 1146 if (error) 1147 goto out_end_trans; 1148 1149 error = gfs2_unlink_inode(dip, dentry); 1150 1151 out_end_trans: 1152 gfs2_trans_end(sdp); 1153 out_gunlock: 1154 gfs2_glock_dq(ghs + 2); 1155 out_rgrp: 1156 gfs2_glock_dq(ghs + 1); 1157 out_child: 1158 gfs2_glock_dq(ghs); 1159 out_parent: 1160 gfs2_holder_uninit(ghs + 2); 1161 out_inodes: 1162 gfs2_holder_uninit(ghs + 1); 1163 gfs2_holder_uninit(ghs); 1164 return error; 1165 } 1166 1167 /** 1168 * gfs2_symlink - Create a symlink 1169 * @dir: The directory to create the symlink in 1170 * @dentry: The dentry to put the symlink in 1171 * @symname: The thing which the link points to 1172 * 1173 * Returns: errno 1174 */ 1175 1176 static int gfs2_symlink(struct inode *dir, struct dentry *dentry, 1177 const char *symname) 1178 { 1179 struct gfs2_sbd *sdp = GFS2_SB(dir); 1180 unsigned int size; 1181 1182 size = strlen(symname); 1183 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1) 1184 return -ENAMETOOLONG; 1185 1186 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0, NULL); 1187 } 1188 1189 /** 1190 * gfs2_mkdir - Make a directory 1191 * @dir: The parent directory of the new one 1192 * @dentry: The dentry of the new directory 1193 * @mode: The mode of the new directory 1194 * 1195 * Returns: errno 1196 */ 1197 1198 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 1199 { 1200 struct gfs2_sbd *sdp = GFS2_SB(dir); 1201 unsigned dsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode); 1202 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0, NULL); 1203 } 1204 1205 /** 1206 * gfs2_mknod - Make a special file 1207 * @dir: The directory in which the special file will reside 1208 * @dentry: The dentry of the special file 1209 * @mode: The mode of the special file 1210 * @dev: The device specification of the special file 1211 * 1212 */ 1213 1214 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, 1215 dev_t dev) 1216 { 1217 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0, NULL); 1218 } 1219 1220 /** 1221 * gfs2_atomic_open - Atomically open a file 1222 * @dir: The directory 1223 * @dentry: The proposed new entry 1224 * @file: The proposed new struct file 1225 * @flags: open flags 1226 * @mode: File mode 1227 * @opened: Flag to say whether the file has been opened or not 1228 * 1229 * Returns: error code or 0 for success 1230 */ 1231 1232 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry, 1233 struct file *file, unsigned flags, 1234 umode_t mode, int *opened) 1235 { 1236 struct dentry *d; 1237 bool excl = !!(flags & O_EXCL); 1238 1239 if (!d_unhashed(dentry)) 1240 goto skip_lookup; 1241 1242 d = __gfs2_lookup(dir, dentry, file, opened); 1243 if (IS_ERR(d)) 1244 return PTR_ERR(d); 1245 if (d != NULL) 1246 dentry = d; 1247 if (dentry->d_inode) { 1248 if (!(*opened & FILE_OPENED)) 1249 return finish_no_open(file, d); 1250 dput(d); 1251 return 0; 1252 } 1253 1254 BUG_ON(d != NULL); 1255 1256 skip_lookup: 1257 if (!(flags & O_CREAT)) 1258 return -ENOENT; 1259 1260 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl, opened); 1261 } 1262 1263 /* 1264 * gfs2_ok_to_move - check if it's ok to move a directory to another directory 1265 * @this: move this 1266 * @to: to here 1267 * 1268 * Follow @to back to the root and make sure we don't encounter @this 1269 * Assumes we already hold the rename lock. 1270 * 1271 * Returns: errno 1272 */ 1273 1274 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) 1275 { 1276 struct inode *dir = &to->i_inode; 1277 struct super_block *sb = dir->i_sb; 1278 struct inode *tmp; 1279 int error = 0; 1280 1281 igrab(dir); 1282 1283 for (;;) { 1284 if (dir == &this->i_inode) { 1285 error = -EINVAL; 1286 break; 1287 } 1288 if (dir == sb->s_root->d_inode) { 1289 error = 0; 1290 break; 1291 } 1292 1293 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1); 1294 if (!tmp) { 1295 error = -ENOENT; 1296 break; 1297 } 1298 if (IS_ERR(tmp)) { 1299 error = PTR_ERR(tmp); 1300 break; 1301 } 1302 1303 iput(dir); 1304 dir = tmp; 1305 } 1306 1307 iput(dir); 1308 1309 return error; 1310 } 1311 1312 /** 1313 * gfs2_rename - Rename a file 1314 * @odir: Parent directory of old file name 1315 * @odentry: The old dentry of the file 1316 * @ndir: Parent directory of new file name 1317 * @ndentry: The new dentry of the file 1318 * 1319 * Returns: errno 1320 */ 1321 1322 static int gfs2_rename(struct inode *odir, struct dentry *odentry, 1323 struct inode *ndir, struct dentry *ndentry) 1324 { 1325 struct gfs2_inode *odip = GFS2_I(odir); 1326 struct gfs2_inode *ndip = GFS2_I(ndir); 1327 struct gfs2_inode *ip = GFS2_I(odentry->d_inode); 1328 struct gfs2_inode *nip = NULL; 1329 struct gfs2_sbd *sdp = GFS2_SB(odir); 1330 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, }; 1331 struct gfs2_rgrpd *nrgd; 1332 unsigned int num_gh; 1333 int dir_rename = 0; 1334 struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, }; 1335 unsigned int x; 1336 int error; 1337 1338 if (ndentry->d_inode) { 1339 nip = GFS2_I(ndentry->d_inode); 1340 if (ip == nip) 1341 return 0; 1342 } 1343 1344 error = gfs2_rindex_update(sdp); 1345 if (error) 1346 return error; 1347 1348 error = gfs2_rs_alloc(ndip); 1349 if (error) 1350 return error; 1351 1352 if (odip != ndip) { 1353 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 1354 0, &r_gh); 1355 if (error) 1356 goto out; 1357 1358 if (S_ISDIR(ip->i_inode.i_mode)) { 1359 dir_rename = 1; 1360 /* don't move a dirctory into it's subdir */ 1361 error = gfs2_ok_to_move(ip, ndip); 1362 if (error) 1363 goto out_gunlock_r; 1364 } 1365 } 1366 1367 num_gh = 1; 1368 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 1369 if (odip != ndip) { 1370 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1371 num_gh++; 1372 } 1373 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1374 num_gh++; 1375 1376 if (nip) { 1377 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1378 num_gh++; 1379 /* grab the resource lock for unlink flag twiddling 1380 * this is the case of the target file already existing 1381 * so we unlink before doing the rename 1382 */ 1383 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1); 1384 if (nrgd) 1385 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++); 1386 } 1387 1388 for (x = 0; x < num_gh; x++) { 1389 error = gfs2_glock_nq(ghs + x); 1390 if (error) 1391 goto out_gunlock; 1392 } 1393 1394 error = -ENOENT; 1395 if (ip->i_inode.i_nlink == 0) 1396 goto out_gunlock; 1397 1398 /* Check out the old directory */ 1399 1400 error = gfs2_unlink_ok(odip, &odentry->d_name, ip); 1401 if (error) 1402 goto out_gunlock; 1403 1404 /* Check out the new directory */ 1405 1406 if (nip) { 1407 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); 1408 if (error) 1409 goto out_gunlock; 1410 1411 if (nip->i_inode.i_nlink == 0) { 1412 error = -EAGAIN; 1413 goto out_gunlock; 1414 } 1415 1416 if (S_ISDIR(nip->i_inode.i_mode)) { 1417 if (nip->i_entries < 2) { 1418 gfs2_consist_inode(nip); 1419 error = -EIO; 1420 goto out_gunlock; 1421 } 1422 if (nip->i_entries > 2) { 1423 error = -ENOTEMPTY; 1424 goto out_gunlock; 1425 } 1426 } 1427 } else { 1428 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC); 1429 if (error) 1430 goto out_gunlock; 1431 1432 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL); 1433 switch (error) { 1434 case -ENOENT: 1435 error = 0; 1436 break; 1437 case 0: 1438 error = -EEXIST; 1439 default: 1440 goto out_gunlock; 1441 }; 1442 1443 if (odip != ndip) { 1444 if (!ndip->i_inode.i_nlink) { 1445 error = -ENOENT; 1446 goto out_gunlock; 1447 } 1448 if (ndip->i_entries == (u32)-1) { 1449 error = -EFBIG; 1450 goto out_gunlock; 1451 } 1452 if (S_ISDIR(ip->i_inode.i_mode) && 1453 ndip->i_inode.i_nlink == (u32)-1) { 1454 error = -EMLINK; 1455 goto out_gunlock; 1456 } 1457 } 1458 } 1459 1460 /* Check out the dir to be renamed */ 1461 1462 if (dir_rename) { 1463 error = gfs2_permission(odentry->d_inode, MAY_WRITE); 1464 if (error) 1465 goto out_gunlock; 1466 } 1467 1468 if (nip == NULL) { 1469 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da); 1470 if (error) 1471 goto out_gunlock; 1472 } 1473 1474 if (da.nr_blocks) { 1475 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, }; 1476 error = gfs2_quota_lock_check(ndip); 1477 if (error) 1478 goto out_gunlock; 1479 1480 error = gfs2_inplace_reserve(ndip, &ap); 1481 if (error) 1482 goto out_gunlock_q; 1483 1484 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) + 1485 4 * RES_LEAF + 4, 0); 1486 if (error) 1487 goto out_ipreserv; 1488 } else { 1489 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 1490 5 * RES_LEAF + 4, 0); 1491 if (error) 1492 goto out_gunlock; 1493 } 1494 1495 /* Remove the target file, if it exists */ 1496 1497 if (nip) 1498 error = gfs2_unlink_inode(ndip, ndentry); 1499 1500 if (dir_rename) { 1501 error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR); 1502 if (error) 1503 goto out_end_trans; 1504 } else { 1505 struct buffer_head *dibh; 1506 error = gfs2_meta_inode_buffer(ip, &dibh); 1507 if (error) 1508 goto out_end_trans; 1509 ip->i_inode.i_ctime = CURRENT_TIME; 1510 gfs2_trans_add_meta(ip->i_gl, dibh); 1511 gfs2_dinode_out(ip, dibh->b_data); 1512 brelse(dibh); 1513 } 1514 1515 error = gfs2_dir_del(odip, odentry); 1516 if (error) 1517 goto out_end_trans; 1518 1519 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da); 1520 if (error) 1521 goto out_end_trans; 1522 1523 out_end_trans: 1524 gfs2_trans_end(sdp); 1525 out_ipreserv: 1526 if (da.nr_blocks) 1527 gfs2_inplace_release(ndip); 1528 out_gunlock_q: 1529 if (da.nr_blocks) 1530 gfs2_quota_unlock(ndip); 1531 out_gunlock: 1532 gfs2_dir_no_add(&da); 1533 while (x--) { 1534 gfs2_glock_dq(ghs + x); 1535 gfs2_holder_uninit(ghs + x); 1536 } 1537 out_gunlock_r: 1538 if (r_gh.gh_gl) 1539 gfs2_glock_dq_uninit(&r_gh); 1540 out: 1541 return error; 1542 } 1543 1544 /** 1545 * gfs2_follow_link - Follow a symbolic link 1546 * @dentry: The dentry of the link 1547 * @nd: Data that we pass to vfs_follow_link() 1548 * 1549 * This can handle symlinks of any size. 1550 * 1551 * Returns: 0 on success or error code 1552 */ 1553 1554 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd) 1555 { 1556 struct gfs2_inode *ip = GFS2_I(dentry->d_inode); 1557 struct gfs2_holder i_gh; 1558 struct buffer_head *dibh; 1559 unsigned int size; 1560 char *buf; 1561 int error; 1562 1563 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); 1564 error = gfs2_glock_nq(&i_gh); 1565 if (error) { 1566 gfs2_holder_uninit(&i_gh); 1567 nd_set_link(nd, ERR_PTR(error)); 1568 return NULL; 1569 } 1570 1571 size = (unsigned int)i_size_read(&ip->i_inode); 1572 if (size == 0) { 1573 gfs2_consist_inode(ip); 1574 buf = ERR_PTR(-EIO); 1575 goto out; 1576 } 1577 1578 error = gfs2_meta_inode_buffer(ip, &dibh); 1579 if (error) { 1580 buf = ERR_PTR(error); 1581 goto out; 1582 } 1583 1584 buf = kzalloc(size + 1, GFP_NOFS); 1585 if (!buf) 1586 buf = ERR_PTR(-ENOMEM); 1587 else 1588 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size); 1589 brelse(dibh); 1590 out: 1591 gfs2_glock_dq_uninit(&i_gh); 1592 nd_set_link(nd, buf); 1593 return NULL; 1594 } 1595 1596 /** 1597 * gfs2_permission - 1598 * @inode: The inode 1599 * @mask: The mask to be tested 1600 * @flags: Indicates whether this is an RCU path walk or not 1601 * 1602 * This may be called from the VFS directly, or from within GFS2 with the 1603 * inode locked, so we look to see if the glock is already locked and only 1604 * lock the glock if its not already been done. 1605 * 1606 * Returns: errno 1607 */ 1608 1609 int gfs2_permission(struct inode *inode, int mask) 1610 { 1611 struct gfs2_inode *ip; 1612 struct gfs2_holder i_gh; 1613 int error; 1614 int unlock = 0; 1615 1616 1617 ip = GFS2_I(inode); 1618 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 1619 if (mask & MAY_NOT_BLOCK) 1620 return -ECHILD; 1621 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); 1622 if (error) 1623 return error; 1624 unlock = 1; 1625 } 1626 1627 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode)) 1628 error = -EACCES; 1629 else 1630 error = generic_permission(inode, mask); 1631 if (unlock) 1632 gfs2_glock_dq_uninit(&i_gh); 1633 1634 return error; 1635 } 1636 1637 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1638 { 1639 setattr_copy(inode, attr); 1640 mark_inode_dirty(inode); 1641 return 0; 1642 } 1643 1644 /** 1645 * gfs2_setattr_simple - 1646 * @ip: 1647 * @attr: 1648 * 1649 * Returns: errno 1650 */ 1651 1652 int gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1653 { 1654 int error; 1655 1656 if (current->journal_info) 1657 return __gfs2_setattr_simple(inode, attr); 1658 1659 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0); 1660 if (error) 1661 return error; 1662 1663 error = __gfs2_setattr_simple(inode, attr); 1664 gfs2_trans_end(GFS2_SB(inode)); 1665 return error; 1666 } 1667 1668 static int setattr_chown(struct inode *inode, struct iattr *attr) 1669 { 1670 struct gfs2_inode *ip = GFS2_I(inode); 1671 struct gfs2_sbd *sdp = GFS2_SB(inode); 1672 kuid_t ouid, nuid; 1673 kgid_t ogid, ngid; 1674 int error; 1675 1676 ouid = inode->i_uid; 1677 ogid = inode->i_gid; 1678 nuid = attr->ia_uid; 1679 ngid = attr->ia_gid; 1680 1681 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid)) 1682 ouid = nuid = NO_UID_QUOTA_CHANGE; 1683 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid)) 1684 ogid = ngid = NO_GID_QUOTA_CHANGE; 1685 1686 error = get_write_access(inode); 1687 if (error) 1688 return error; 1689 1690 error = gfs2_rs_alloc(ip); 1691 if (error) 1692 goto out; 1693 1694 error = gfs2_rindex_update(sdp); 1695 if (error) 1696 goto out; 1697 1698 error = gfs2_quota_lock(ip, nuid, ngid); 1699 if (error) 1700 goto out; 1701 1702 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 1703 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 1704 error = gfs2_quota_check(ip, nuid, ngid); 1705 if (error) 1706 goto out_gunlock_q; 1707 } 1708 1709 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0); 1710 if (error) 1711 goto out_gunlock_q; 1712 1713 error = gfs2_setattr_simple(inode, attr); 1714 if (error) 1715 goto out_end_trans; 1716 1717 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 1718 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 1719 u64 blocks = gfs2_get_inode_blocks(&ip->i_inode); 1720 gfs2_quota_change(ip, -blocks, ouid, ogid); 1721 gfs2_quota_change(ip, blocks, nuid, ngid); 1722 } 1723 1724 out_end_trans: 1725 gfs2_trans_end(sdp); 1726 out_gunlock_q: 1727 gfs2_quota_unlock(ip); 1728 out: 1729 put_write_access(inode); 1730 return error; 1731 } 1732 1733 /** 1734 * gfs2_setattr - Change attributes on an inode 1735 * @dentry: The dentry which is changing 1736 * @attr: The structure describing the change 1737 * 1738 * The VFS layer wants to change one or more of an inodes attributes. Write 1739 * that change out to disk. 1740 * 1741 * Returns: errno 1742 */ 1743 1744 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr) 1745 { 1746 struct inode *inode = dentry->d_inode; 1747 struct gfs2_inode *ip = GFS2_I(inode); 1748 struct gfs2_holder i_gh; 1749 int error; 1750 1751 error = gfs2_rs_alloc(ip); 1752 if (error) 1753 return error; 1754 1755 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); 1756 if (error) 1757 return error; 1758 1759 error = -EPERM; 1760 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 1761 goto out; 1762 1763 error = inode_change_ok(inode, attr); 1764 if (error) 1765 goto out; 1766 1767 if (attr->ia_valid & ATTR_SIZE) 1768 error = gfs2_setattr_size(inode, attr->ia_size); 1769 else if (attr->ia_valid & (ATTR_UID | ATTR_GID)) 1770 error = setattr_chown(inode, attr); 1771 else { 1772 error = gfs2_setattr_simple(inode, attr); 1773 if (!error && attr->ia_valid & ATTR_MODE) 1774 error = posix_acl_chmod(inode, inode->i_mode); 1775 } 1776 1777 out: 1778 if (!error) 1779 mark_inode_dirty(inode); 1780 gfs2_glock_dq_uninit(&i_gh); 1781 return error; 1782 } 1783 1784 /** 1785 * gfs2_getattr - Read out an inode's attributes 1786 * @mnt: The vfsmount the inode is being accessed from 1787 * @dentry: The dentry to stat 1788 * @stat: The inode's stats 1789 * 1790 * This may be called from the VFS directly, or from within GFS2 with the 1791 * inode locked, so we look to see if the glock is already locked and only 1792 * lock the glock if its not already been done. Note that its the NFS 1793 * readdirplus operation which causes this to be called (from filldir) 1794 * with the glock already held. 1795 * 1796 * Returns: errno 1797 */ 1798 1799 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry, 1800 struct kstat *stat) 1801 { 1802 struct inode *inode = dentry->d_inode; 1803 struct gfs2_inode *ip = GFS2_I(inode); 1804 struct gfs2_holder gh; 1805 int error; 1806 int unlock = 0; 1807 1808 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 1809 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 1810 if (error) 1811 return error; 1812 unlock = 1; 1813 } 1814 1815 generic_fillattr(inode, stat); 1816 if (unlock) 1817 gfs2_glock_dq_uninit(&gh); 1818 1819 return 0; 1820 } 1821 1822 static int gfs2_setxattr(struct dentry *dentry, const char *name, 1823 const void *data, size_t size, int flags) 1824 { 1825 struct inode *inode = dentry->d_inode; 1826 struct gfs2_inode *ip = GFS2_I(inode); 1827 struct gfs2_holder gh; 1828 int ret; 1829 1830 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 1831 ret = gfs2_glock_nq(&gh); 1832 if (ret == 0) { 1833 ret = gfs2_rs_alloc(ip); 1834 if (ret == 0) 1835 ret = generic_setxattr(dentry, name, data, size, flags); 1836 gfs2_glock_dq(&gh); 1837 } 1838 gfs2_holder_uninit(&gh); 1839 return ret; 1840 } 1841 1842 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name, 1843 void *data, size_t size) 1844 { 1845 struct inode *inode = dentry->d_inode; 1846 struct gfs2_inode *ip = GFS2_I(inode); 1847 struct gfs2_holder gh; 1848 int ret; 1849 1850 /* For selinux during lookup */ 1851 if (gfs2_glock_is_locked_by_me(ip->i_gl)) 1852 return generic_getxattr(dentry, name, data, size); 1853 1854 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 1855 ret = gfs2_glock_nq(&gh); 1856 if (ret == 0) { 1857 ret = generic_getxattr(dentry, name, data, size); 1858 gfs2_glock_dq(&gh); 1859 } 1860 gfs2_holder_uninit(&gh); 1861 return ret; 1862 } 1863 1864 static int gfs2_removexattr(struct dentry *dentry, const char *name) 1865 { 1866 struct inode *inode = dentry->d_inode; 1867 struct gfs2_inode *ip = GFS2_I(inode); 1868 struct gfs2_holder gh; 1869 int ret; 1870 1871 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 1872 ret = gfs2_glock_nq(&gh); 1873 if (ret == 0) { 1874 ret = gfs2_rs_alloc(ip); 1875 if (ret == 0) 1876 ret = generic_removexattr(dentry, name); 1877 gfs2_glock_dq(&gh); 1878 } 1879 gfs2_holder_uninit(&gh); 1880 return ret; 1881 } 1882 1883 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 1884 u64 start, u64 len) 1885 { 1886 struct gfs2_inode *ip = GFS2_I(inode); 1887 struct gfs2_holder gh; 1888 int ret; 1889 1890 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC); 1891 if (ret) 1892 return ret; 1893 1894 mutex_lock(&inode->i_mutex); 1895 1896 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 1897 if (ret) 1898 goto out; 1899 1900 if (gfs2_is_stuffed(ip)) { 1901 u64 phys = ip->i_no_addr << inode->i_blkbits; 1902 u64 size = i_size_read(inode); 1903 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED| 1904 FIEMAP_EXTENT_DATA_INLINE; 1905 phys += sizeof(struct gfs2_dinode); 1906 phys += start; 1907 if (start + len > size) 1908 len = size - start; 1909 if (start < size) 1910 ret = fiemap_fill_next_extent(fieinfo, start, phys, 1911 len, flags); 1912 if (ret == 1) 1913 ret = 0; 1914 } else { 1915 ret = __generic_block_fiemap(inode, fieinfo, start, len, 1916 gfs2_block_map); 1917 } 1918 1919 gfs2_glock_dq_uninit(&gh); 1920 out: 1921 mutex_unlock(&inode->i_mutex); 1922 return ret; 1923 } 1924 1925 const struct inode_operations gfs2_file_iops = { 1926 .permission = gfs2_permission, 1927 .setattr = gfs2_setattr, 1928 .getattr = gfs2_getattr, 1929 .setxattr = gfs2_setxattr, 1930 .getxattr = gfs2_getxattr, 1931 .listxattr = gfs2_listxattr, 1932 .removexattr = gfs2_removexattr, 1933 .fiemap = gfs2_fiemap, 1934 .get_acl = gfs2_get_acl, 1935 .set_acl = gfs2_set_acl, 1936 }; 1937 1938 const struct inode_operations gfs2_dir_iops = { 1939 .create = gfs2_create, 1940 .lookup = gfs2_lookup, 1941 .link = gfs2_link, 1942 .unlink = gfs2_unlink, 1943 .symlink = gfs2_symlink, 1944 .mkdir = gfs2_mkdir, 1945 .rmdir = gfs2_unlink, 1946 .mknod = gfs2_mknod, 1947 .rename = gfs2_rename, 1948 .permission = gfs2_permission, 1949 .setattr = gfs2_setattr, 1950 .getattr = gfs2_getattr, 1951 .setxattr = gfs2_setxattr, 1952 .getxattr = gfs2_getxattr, 1953 .listxattr = gfs2_listxattr, 1954 .removexattr = gfs2_removexattr, 1955 .fiemap = gfs2_fiemap, 1956 .get_acl = gfs2_get_acl, 1957 .set_acl = gfs2_set_acl, 1958 .atomic_open = gfs2_atomic_open, 1959 }; 1960 1961 const struct inode_operations gfs2_symlink_iops = { 1962 .readlink = generic_readlink, 1963 .follow_link = gfs2_follow_link, 1964 .put_link = kfree_put_link, 1965 .permission = gfs2_permission, 1966 .setattr = gfs2_setattr, 1967 .getattr = gfs2_getattr, 1968 .setxattr = gfs2_setxattr, 1969 .getxattr = gfs2_getxattr, 1970 .listxattr = gfs2_listxattr, 1971 .removexattr = gfs2_removexattr, 1972 .fiemap = gfs2_fiemap, 1973 }; 1974 1975