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 == d_inode(sb->s_root))) { 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, &ap); 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, &ap); 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); 546 547 gfs2_trans_end(sdp); 548 fail_ipreserv: 549 gfs2_inplace_release(dip); 550 fail_quota_locks: 551 gfs2_quota_unlock(dip); 552 return error; 553 } 554 555 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array, 556 void *fs_info) 557 { 558 const struct xattr *xattr; 559 int err = 0; 560 561 for (xattr = xattr_array; xattr->name != NULL; xattr++) { 562 err = __gfs2_xattr_set(inode, xattr->name, xattr->value, 563 xattr->value_len, 0, 564 GFS2_EATYPE_SECURITY); 565 if (err < 0) 566 break; 567 } 568 return err; 569 } 570 571 /** 572 * gfs2_create_inode - Create a new inode 573 * @dir: The parent directory 574 * @dentry: The new dentry 575 * @file: If non-NULL, the file which is being opened 576 * @mode: The permissions on the new inode 577 * @dev: For device nodes, this is the device number 578 * @symname: For symlinks, this is the link destination 579 * @size: The initial size of the inode (ignored for directories) 580 * 581 * Returns: 0 on success, or error code 582 */ 583 584 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry, 585 struct file *file, 586 umode_t mode, dev_t dev, const char *symname, 587 unsigned int size, int excl, int *opened) 588 { 589 const struct qstr *name = &dentry->d_name; 590 struct posix_acl *default_acl, *acl; 591 struct gfs2_holder ghs[2]; 592 struct inode *inode = NULL; 593 struct gfs2_inode *dip = GFS2_I(dir), *ip; 594 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 595 struct gfs2_glock *io_gl; 596 int error, free_vfs_inode = 0; 597 u32 aflags = 0; 598 unsigned blocks = 1; 599 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, }; 600 601 if (!name->len || name->len > GFS2_FNAMESIZE) 602 return -ENAMETOOLONG; 603 604 error = gfs2_rs_alloc(dip); 605 if (error) 606 return error; 607 608 error = gfs2_rindex_update(sdp); 609 if (error) 610 return error; 611 612 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 613 if (error) 614 goto fail; 615 616 error = create_ok(dip, name, mode); 617 if (error) 618 goto fail_gunlock; 619 620 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl); 621 error = PTR_ERR(inode); 622 if (!IS_ERR(inode)) { 623 if (S_ISDIR(inode->i_mode)) { 624 iput(inode); 625 inode = ERR_PTR(-EISDIR); 626 goto fail_gunlock; 627 } 628 d_instantiate(dentry, inode); 629 error = 0; 630 if (file) { 631 if (S_ISREG(inode->i_mode)) 632 error = finish_open(file, dentry, gfs2_open_common, opened); 633 else 634 error = finish_no_open(file, NULL); 635 } 636 gfs2_glock_dq_uninit(ghs); 637 return error; 638 } else if (error != -ENOENT) { 639 goto fail_gunlock; 640 } 641 642 error = gfs2_diradd_alloc_required(dir, name, &da); 643 if (error < 0) 644 goto fail_gunlock; 645 646 inode = new_inode(sdp->sd_vfs); 647 error = -ENOMEM; 648 if (!inode) 649 goto fail_gunlock; 650 651 error = posix_acl_create(dir, &mode, &default_acl, &acl); 652 if (error) 653 goto fail_free_vfs_inode; 654 655 ip = GFS2_I(inode); 656 error = gfs2_rs_alloc(ip); 657 if (error) 658 goto fail_free_acls; 659 660 inode->i_mode = mode; 661 set_nlink(inode, S_ISDIR(mode) ? 2 : 1); 662 inode->i_rdev = dev; 663 inode->i_size = size; 664 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 665 gfs2_set_inode_blocks(inode, 1); 666 munge_mode_uid_gid(dip, inode); 667 check_and_update_goal(dip); 668 ip->i_goal = dip->i_goal; 669 ip->i_diskflags = 0; 670 ip->i_eattr = 0; 671 ip->i_height = 0; 672 ip->i_depth = 0; 673 ip->i_entries = 0; 674 675 switch(mode & S_IFMT) { 676 case S_IFREG: 677 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) || 678 gfs2_tune_get(sdp, gt_new_files_jdata)) 679 ip->i_diskflags |= GFS2_DIF_JDATA; 680 gfs2_set_aops(inode); 681 break; 682 case S_IFDIR: 683 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA); 684 ip->i_diskflags |= GFS2_DIF_JDATA; 685 ip->i_entries = 2; 686 break; 687 } 688 gfs2_set_inode_flags(inode); 689 690 if ((GFS2_I(d_inode(sdp->sd_root_dir)) == dip) || 691 (dip->i_diskflags & GFS2_DIF_TOPDIR)) 692 aflags |= GFS2_AF_ORLOV; 693 694 if (default_acl || acl) 695 blocks++; 696 697 error = alloc_dinode(ip, aflags, &blocks); 698 if (error) 699 goto fail_free_inode; 700 701 gfs2_set_inode_blocks(inode, blocks); 702 703 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); 704 if (error) 705 goto fail_free_inode; 706 707 ip->i_gl->gl_object = ip; 708 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1); 709 if (error) 710 goto fail_free_inode; 711 712 error = gfs2_trans_begin(sdp, blocks, 0); 713 if (error) 714 goto fail_gunlock2; 715 716 if (blocks > 1) { 717 ip->i_eattr = ip->i_no_addr + 1; 718 gfs2_init_xattr(ip); 719 } 720 init_dinode(dip, ip, symname); 721 gfs2_trans_end(sdp); 722 723 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl); 724 if (error) 725 goto fail_gunlock2; 726 727 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); 728 if (error) 729 goto fail_gunlock2; 730 731 ip->i_iopen_gh.gh_gl->gl_object = ip; 732 gfs2_glock_put(io_gl); 733 gfs2_set_iop(inode); 734 insert_inode_hash(inode); 735 736 if (default_acl) { 737 error = gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT); 738 posix_acl_release(default_acl); 739 } 740 if (acl) { 741 if (!error) 742 error = gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS); 743 posix_acl_release(acl); 744 } 745 746 if (error) 747 goto fail_gunlock3; 748 749 error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name, 750 &gfs2_initxattrs, NULL); 751 if (error) 752 goto fail_gunlock3; 753 754 error = link_dinode(dip, name, ip, &da); 755 if (error) 756 goto fail_gunlock3; 757 758 mark_inode_dirty(inode); 759 d_instantiate(dentry, inode); 760 if (file) { 761 *opened |= FILE_CREATED; 762 error = finish_open(file, dentry, gfs2_open_common, opened); 763 } 764 gfs2_glock_dq_uninit(ghs); 765 gfs2_glock_dq_uninit(ghs + 1); 766 return error; 767 768 fail_gunlock3: 769 gfs2_glock_dq_uninit(ghs + 1); 770 if (ip->i_gl) 771 gfs2_glock_put(ip->i_gl); 772 goto fail_gunlock; 773 774 fail_gunlock2: 775 gfs2_glock_dq_uninit(ghs + 1); 776 fail_free_inode: 777 if (ip->i_gl) 778 gfs2_glock_put(ip->i_gl); 779 gfs2_rs_delete(ip, NULL); 780 fail_free_acls: 781 if (default_acl) 782 posix_acl_release(default_acl); 783 if (acl) 784 posix_acl_release(acl); 785 fail_free_vfs_inode: 786 free_vfs_inode = 1; 787 fail_gunlock: 788 gfs2_dir_no_add(&da); 789 gfs2_glock_dq_uninit(ghs); 790 if (inode && !IS_ERR(inode)) { 791 clear_nlink(inode); 792 if (!free_vfs_inode) 793 mark_inode_dirty(inode); 794 set_bit(free_vfs_inode ? GIF_FREE_VFS_INODE : GIF_ALLOC_FAILED, 795 &GFS2_I(inode)->i_flags); 796 iput(inode); 797 } 798 fail: 799 return error; 800 } 801 802 /** 803 * gfs2_create - Create a file 804 * @dir: The directory in which to create the file 805 * @dentry: The dentry of the new file 806 * @mode: The mode of the new file 807 * 808 * Returns: errno 809 */ 810 811 static int gfs2_create(struct inode *dir, struct dentry *dentry, 812 umode_t mode, bool excl) 813 { 814 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl, NULL); 815 } 816 817 /** 818 * __gfs2_lookup - Look up a filename in a directory and return its inode 819 * @dir: The directory inode 820 * @dentry: The dentry of the new inode 821 * @file: File to be opened 822 * @opened: atomic_open flags 823 * 824 * 825 * Returns: errno 826 */ 827 828 static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry, 829 struct file *file, int *opened) 830 { 831 struct inode *inode; 832 struct dentry *d; 833 struct gfs2_holder gh; 834 struct gfs2_glock *gl; 835 int error; 836 837 inode = gfs2_lookupi(dir, &dentry->d_name, 0); 838 if (inode == NULL) { 839 d_add(dentry, NULL); 840 return NULL; 841 } 842 if (IS_ERR(inode)) 843 return ERR_CAST(inode); 844 845 gl = GFS2_I(inode)->i_gl; 846 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 847 if (error) { 848 iput(inode); 849 return ERR_PTR(error); 850 } 851 852 d = d_splice_alias(inode, dentry); 853 if (IS_ERR(d)) { 854 gfs2_glock_dq_uninit(&gh); 855 return d; 856 } 857 if (file && S_ISREG(inode->i_mode)) 858 error = finish_open(file, dentry, gfs2_open_common, opened); 859 860 gfs2_glock_dq_uninit(&gh); 861 if (error) { 862 dput(d); 863 return ERR_PTR(error); 864 } 865 return d; 866 } 867 868 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry, 869 unsigned flags) 870 { 871 return __gfs2_lookup(dir, dentry, NULL, NULL); 872 } 873 874 /** 875 * gfs2_link - Link to a file 876 * @old_dentry: The inode to link 877 * @dir: Add link to this directory 878 * @dentry: The name of the link 879 * 880 * Link the inode in "old_dentry" into the directory "dir" with the 881 * name in "dentry". 882 * 883 * Returns: errno 884 */ 885 886 static int gfs2_link(struct dentry *old_dentry, struct inode *dir, 887 struct dentry *dentry) 888 { 889 struct gfs2_inode *dip = GFS2_I(dir); 890 struct gfs2_sbd *sdp = GFS2_SB(dir); 891 struct inode *inode = d_inode(old_dentry); 892 struct gfs2_inode *ip = GFS2_I(inode); 893 struct gfs2_holder ghs[2]; 894 struct buffer_head *dibh; 895 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, }; 896 int error; 897 898 if (S_ISDIR(inode->i_mode)) 899 return -EPERM; 900 901 error = gfs2_rs_alloc(dip); 902 if (error) 903 return error; 904 905 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 906 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); 907 908 error = gfs2_glock_nq(ghs); /* parent */ 909 if (error) 910 goto out_parent; 911 912 error = gfs2_glock_nq(ghs + 1); /* child */ 913 if (error) 914 goto out_child; 915 916 error = -ENOENT; 917 if (inode->i_nlink == 0) 918 goto out_gunlock; 919 920 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC); 921 if (error) 922 goto out_gunlock; 923 924 error = gfs2_dir_check(dir, &dentry->d_name, NULL); 925 switch (error) { 926 case -ENOENT: 927 break; 928 case 0: 929 error = -EEXIST; 930 default: 931 goto out_gunlock; 932 } 933 934 error = -EINVAL; 935 if (!dip->i_inode.i_nlink) 936 goto out_gunlock; 937 error = -EFBIG; 938 if (dip->i_entries == (u32)-1) 939 goto out_gunlock; 940 error = -EPERM; 941 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 942 goto out_gunlock; 943 error = -EINVAL; 944 if (!ip->i_inode.i_nlink) 945 goto out_gunlock; 946 error = -EMLINK; 947 if (ip->i_inode.i_nlink == (u32)-1) 948 goto out_gunlock; 949 950 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da); 951 if (error < 0) 952 goto out_gunlock; 953 954 if (da.nr_blocks) { 955 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, }; 956 error = gfs2_quota_lock_check(dip, &ap); 957 if (error) 958 goto out_gunlock; 959 960 error = gfs2_inplace_reserve(dip, &ap); 961 if (error) 962 goto out_gunlock_q; 963 964 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0); 965 if (error) 966 goto out_ipres; 967 } else { 968 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0); 969 if (error) 970 goto out_ipres; 971 } 972 973 error = gfs2_meta_inode_buffer(ip, &dibh); 974 if (error) 975 goto out_end_trans; 976 977 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da); 978 if (error) 979 goto out_brelse; 980 981 gfs2_trans_add_meta(ip->i_gl, dibh); 982 inc_nlink(&ip->i_inode); 983 ip->i_inode.i_ctime = CURRENT_TIME; 984 ihold(inode); 985 d_instantiate(dentry, inode); 986 mark_inode_dirty(inode); 987 988 out_brelse: 989 brelse(dibh); 990 out_end_trans: 991 gfs2_trans_end(sdp); 992 out_ipres: 993 if (da.nr_blocks) 994 gfs2_inplace_release(dip); 995 out_gunlock_q: 996 if (da.nr_blocks) 997 gfs2_quota_unlock(dip); 998 out_gunlock: 999 gfs2_dir_no_add(&da); 1000 gfs2_glock_dq(ghs + 1); 1001 out_child: 1002 gfs2_glock_dq(ghs); 1003 out_parent: 1004 gfs2_holder_uninit(ghs); 1005 gfs2_holder_uninit(ghs + 1); 1006 return error; 1007 } 1008 1009 /* 1010 * gfs2_unlink_ok - check to see that a inode is still in a directory 1011 * @dip: the directory 1012 * @name: the name of the file 1013 * @ip: the inode 1014 * 1015 * Assumes that the lock on (at least) @dip is held. 1016 * 1017 * Returns: 0 if the parent/child relationship is correct, errno if it isn't 1018 */ 1019 1020 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, 1021 const struct gfs2_inode *ip) 1022 { 1023 int error; 1024 1025 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) 1026 return -EPERM; 1027 1028 if ((dip->i_inode.i_mode & S_ISVTX) && 1029 !uid_eq(dip->i_inode.i_uid, current_fsuid()) && 1030 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER)) 1031 return -EPERM; 1032 1033 if (IS_APPEND(&dip->i_inode)) 1034 return -EPERM; 1035 1036 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC); 1037 if (error) 1038 return error; 1039 1040 return gfs2_dir_check(&dip->i_inode, name, ip); 1041 } 1042 1043 /** 1044 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it 1045 * @dip: The parent directory 1046 * @name: The name of the entry in the parent directory 1047 * @inode: The inode to be removed 1048 * 1049 * Called with all the locks and in a transaction. This will only be 1050 * called for a directory after it has been checked to ensure it is empty. 1051 * 1052 * Returns: 0 on success, or an error 1053 */ 1054 1055 static int gfs2_unlink_inode(struct gfs2_inode *dip, 1056 const struct dentry *dentry) 1057 { 1058 struct inode *inode = d_inode(dentry); 1059 struct gfs2_inode *ip = GFS2_I(inode); 1060 int error; 1061 1062 error = gfs2_dir_del(dip, dentry); 1063 if (error) 1064 return error; 1065 1066 ip->i_entries = 0; 1067 inode->i_ctime = CURRENT_TIME; 1068 if (S_ISDIR(inode->i_mode)) 1069 clear_nlink(inode); 1070 else 1071 drop_nlink(inode); 1072 mark_inode_dirty(inode); 1073 if (inode->i_nlink == 0) 1074 gfs2_unlink_di(inode); 1075 return 0; 1076 } 1077 1078 1079 /** 1080 * gfs2_unlink - Unlink an inode (this does rmdir as well) 1081 * @dir: The inode of the directory containing the inode to unlink 1082 * @dentry: The file itself 1083 * 1084 * This routine uses the type of the inode as a flag to figure out 1085 * whether this is an unlink or an rmdir. 1086 * 1087 * Returns: errno 1088 */ 1089 1090 static int gfs2_unlink(struct inode *dir, struct dentry *dentry) 1091 { 1092 struct gfs2_inode *dip = GFS2_I(dir); 1093 struct gfs2_sbd *sdp = GFS2_SB(dir); 1094 struct inode *inode = d_inode(dentry); 1095 struct gfs2_inode *ip = GFS2_I(inode); 1096 struct gfs2_holder ghs[3]; 1097 struct gfs2_rgrpd *rgd; 1098 int error; 1099 1100 error = gfs2_rindex_update(sdp); 1101 if (error) 1102 return error; 1103 1104 error = -EROFS; 1105 1106 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 1107 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); 1108 1109 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1); 1110 if (!rgd) 1111 goto out_inodes; 1112 1113 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2); 1114 1115 1116 error = gfs2_glock_nq(ghs); /* parent */ 1117 if (error) 1118 goto out_parent; 1119 1120 error = gfs2_glock_nq(ghs + 1); /* child */ 1121 if (error) 1122 goto out_child; 1123 1124 error = -ENOENT; 1125 if (inode->i_nlink == 0) 1126 goto out_rgrp; 1127 1128 if (S_ISDIR(inode->i_mode)) { 1129 error = -ENOTEMPTY; 1130 if (ip->i_entries > 2 || inode->i_nlink > 2) 1131 goto out_rgrp; 1132 } 1133 1134 error = gfs2_glock_nq(ghs + 2); /* rgrp */ 1135 if (error) 1136 goto out_rgrp; 1137 1138 error = gfs2_unlink_ok(dip, &dentry->d_name, ip); 1139 if (error) 1140 goto out_gunlock; 1141 1142 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0); 1143 if (error) 1144 goto out_end_trans; 1145 1146 error = gfs2_unlink_inode(dip, dentry); 1147 1148 out_end_trans: 1149 gfs2_trans_end(sdp); 1150 out_gunlock: 1151 gfs2_glock_dq(ghs + 2); 1152 out_rgrp: 1153 gfs2_glock_dq(ghs + 1); 1154 out_child: 1155 gfs2_glock_dq(ghs); 1156 out_parent: 1157 gfs2_holder_uninit(ghs + 2); 1158 out_inodes: 1159 gfs2_holder_uninit(ghs + 1); 1160 gfs2_holder_uninit(ghs); 1161 return error; 1162 } 1163 1164 /** 1165 * gfs2_symlink - Create a symlink 1166 * @dir: The directory to create the symlink in 1167 * @dentry: The dentry to put the symlink in 1168 * @symname: The thing which the link points to 1169 * 1170 * Returns: errno 1171 */ 1172 1173 static int gfs2_symlink(struct inode *dir, struct dentry *dentry, 1174 const char *symname) 1175 { 1176 struct gfs2_sbd *sdp = GFS2_SB(dir); 1177 unsigned int size; 1178 1179 size = strlen(symname); 1180 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1) 1181 return -ENAMETOOLONG; 1182 1183 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0, NULL); 1184 } 1185 1186 /** 1187 * gfs2_mkdir - Make a directory 1188 * @dir: The parent directory of the new one 1189 * @dentry: The dentry of the new directory 1190 * @mode: The mode of the new directory 1191 * 1192 * Returns: errno 1193 */ 1194 1195 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 1196 { 1197 struct gfs2_sbd *sdp = GFS2_SB(dir); 1198 unsigned dsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode); 1199 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0, NULL); 1200 } 1201 1202 /** 1203 * gfs2_mknod - Make a special file 1204 * @dir: The directory in which the special file will reside 1205 * @dentry: The dentry of the special file 1206 * @mode: The mode of the special file 1207 * @dev: The device specification of the special file 1208 * 1209 */ 1210 1211 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, 1212 dev_t dev) 1213 { 1214 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0, NULL); 1215 } 1216 1217 /** 1218 * gfs2_atomic_open - Atomically open a file 1219 * @dir: The directory 1220 * @dentry: The proposed new entry 1221 * @file: The proposed new struct file 1222 * @flags: open flags 1223 * @mode: File mode 1224 * @opened: Flag to say whether the file has been opened or not 1225 * 1226 * Returns: error code or 0 for success 1227 */ 1228 1229 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry, 1230 struct file *file, unsigned flags, 1231 umode_t mode, int *opened) 1232 { 1233 struct dentry *d; 1234 bool excl = !!(flags & O_EXCL); 1235 1236 if (!d_unhashed(dentry)) 1237 goto skip_lookup; 1238 1239 d = __gfs2_lookup(dir, dentry, file, opened); 1240 if (IS_ERR(d)) 1241 return PTR_ERR(d); 1242 if (d != NULL) 1243 dentry = d; 1244 if (d_really_is_positive(dentry)) { 1245 if (!(*opened & FILE_OPENED)) 1246 return finish_no_open(file, d); 1247 dput(d); 1248 return 0; 1249 } 1250 1251 BUG_ON(d != NULL); 1252 1253 skip_lookup: 1254 if (!(flags & O_CREAT)) 1255 return -ENOENT; 1256 1257 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl, opened); 1258 } 1259 1260 /* 1261 * gfs2_ok_to_move - check if it's ok to move a directory to another directory 1262 * @this: move this 1263 * @to: to here 1264 * 1265 * Follow @to back to the root and make sure we don't encounter @this 1266 * Assumes we already hold the rename lock. 1267 * 1268 * Returns: errno 1269 */ 1270 1271 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) 1272 { 1273 struct inode *dir = &to->i_inode; 1274 struct super_block *sb = dir->i_sb; 1275 struct inode *tmp; 1276 int error = 0; 1277 1278 igrab(dir); 1279 1280 for (;;) { 1281 if (dir == &this->i_inode) { 1282 error = -EINVAL; 1283 break; 1284 } 1285 if (dir == d_inode(sb->s_root)) { 1286 error = 0; 1287 break; 1288 } 1289 1290 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1); 1291 if (!tmp) { 1292 error = -ENOENT; 1293 break; 1294 } 1295 if (IS_ERR(tmp)) { 1296 error = PTR_ERR(tmp); 1297 break; 1298 } 1299 1300 iput(dir); 1301 dir = tmp; 1302 } 1303 1304 iput(dir); 1305 1306 return error; 1307 } 1308 1309 /** 1310 * gfs2_rename - Rename a file 1311 * @odir: Parent directory of old file name 1312 * @odentry: The old dentry of the file 1313 * @ndir: Parent directory of new file name 1314 * @ndentry: The new dentry of the file 1315 * 1316 * Returns: errno 1317 */ 1318 1319 static int gfs2_rename(struct inode *odir, struct dentry *odentry, 1320 struct inode *ndir, struct dentry *ndentry) 1321 { 1322 struct gfs2_inode *odip = GFS2_I(odir); 1323 struct gfs2_inode *ndip = GFS2_I(ndir); 1324 struct gfs2_inode *ip = GFS2_I(d_inode(odentry)); 1325 struct gfs2_inode *nip = NULL; 1326 struct gfs2_sbd *sdp = GFS2_SB(odir); 1327 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, }; 1328 struct gfs2_rgrpd *nrgd; 1329 unsigned int num_gh; 1330 int dir_rename = 0; 1331 struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, }; 1332 unsigned int x; 1333 int error; 1334 1335 if (d_really_is_positive(ndentry)) { 1336 nip = GFS2_I(d_inode(ndentry)); 1337 if (ip == nip) 1338 return 0; 1339 } 1340 1341 error = gfs2_rindex_update(sdp); 1342 if (error) 1343 return error; 1344 1345 error = gfs2_rs_alloc(ndip); 1346 if (error) 1347 return error; 1348 1349 if (odip != ndip) { 1350 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 1351 0, &r_gh); 1352 if (error) 1353 goto out; 1354 1355 if (S_ISDIR(ip->i_inode.i_mode)) { 1356 dir_rename = 1; 1357 /* don't move a dirctory into it's subdir */ 1358 error = gfs2_ok_to_move(ip, ndip); 1359 if (error) 1360 goto out_gunlock_r; 1361 } 1362 } 1363 1364 num_gh = 1; 1365 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 1366 if (odip != ndip) { 1367 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1368 num_gh++; 1369 } 1370 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1371 num_gh++; 1372 1373 if (nip) { 1374 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1375 num_gh++; 1376 /* grab the resource lock for unlink flag twiddling 1377 * this is the case of the target file already existing 1378 * so we unlink before doing the rename 1379 */ 1380 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1); 1381 if (nrgd) 1382 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++); 1383 } 1384 1385 for (x = 0; x < num_gh; x++) { 1386 error = gfs2_glock_nq(ghs + x); 1387 if (error) 1388 goto out_gunlock; 1389 } 1390 1391 error = -ENOENT; 1392 if (ip->i_inode.i_nlink == 0) 1393 goto out_gunlock; 1394 1395 /* Check out the old directory */ 1396 1397 error = gfs2_unlink_ok(odip, &odentry->d_name, ip); 1398 if (error) 1399 goto out_gunlock; 1400 1401 /* Check out the new directory */ 1402 1403 if (nip) { 1404 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); 1405 if (error) 1406 goto out_gunlock; 1407 1408 if (nip->i_inode.i_nlink == 0) { 1409 error = -EAGAIN; 1410 goto out_gunlock; 1411 } 1412 1413 if (S_ISDIR(nip->i_inode.i_mode)) { 1414 if (nip->i_entries < 2) { 1415 gfs2_consist_inode(nip); 1416 error = -EIO; 1417 goto out_gunlock; 1418 } 1419 if (nip->i_entries > 2) { 1420 error = -ENOTEMPTY; 1421 goto out_gunlock; 1422 } 1423 } 1424 } else { 1425 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC); 1426 if (error) 1427 goto out_gunlock; 1428 1429 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL); 1430 switch (error) { 1431 case -ENOENT: 1432 error = 0; 1433 break; 1434 case 0: 1435 error = -EEXIST; 1436 default: 1437 goto out_gunlock; 1438 }; 1439 1440 if (odip != ndip) { 1441 if (!ndip->i_inode.i_nlink) { 1442 error = -ENOENT; 1443 goto out_gunlock; 1444 } 1445 if (ndip->i_entries == (u32)-1) { 1446 error = -EFBIG; 1447 goto out_gunlock; 1448 } 1449 if (S_ISDIR(ip->i_inode.i_mode) && 1450 ndip->i_inode.i_nlink == (u32)-1) { 1451 error = -EMLINK; 1452 goto out_gunlock; 1453 } 1454 } 1455 } 1456 1457 /* Check out the dir to be renamed */ 1458 1459 if (dir_rename) { 1460 error = gfs2_permission(d_inode(odentry), MAY_WRITE); 1461 if (error) 1462 goto out_gunlock; 1463 } 1464 1465 if (nip == NULL) { 1466 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da); 1467 if (error) 1468 goto out_gunlock; 1469 } 1470 1471 if (da.nr_blocks) { 1472 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, }; 1473 error = gfs2_quota_lock_check(ndip, &ap); 1474 if (error) 1475 goto out_gunlock; 1476 1477 error = gfs2_inplace_reserve(ndip, &ap); 1478 if (error) 1479 goto out_gunlock_q; 1480 1481 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) + 1482 4 * RES_LEAF + 4, 0); 1483 if (error) 1484 goto out_ipreserv; 1485 } else { 1486 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 1487 5 * RES_LEAF + 4, 0); 1488 if (error) 1489 goto out_gunlock; 1490 } 1491 1492 /* Remove the target file, if it exists */ 1493 1494 if (nip) 1495 error = gfs2_unlink_inode(ndip, ndentry); 1496 1497 if (dir_rename) { 1498 error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR); 1499 if (error) 1500 goto out_end_trans; 1501 } else { 1502 struct buffer_head *dibh; 1503 error = gfs2_meta_inode_buffer(ip, &dibh); 1504 if (error) 1505 goto out_end_trans; 1506 ip->i_inode.i_ctime = CURRENT_TIME; 1507 gfs2_trans_add_meta(ip->i_gl, dibh); 1508 gfs2_dinode_out(ip, dibh->b_data); 1509 brelse(dibh); 1510 } 1511 1512 error = gfs2_dir_del(odip, odentry); 1513 if (error) 1514 goto out_end_trans; 1515 1516 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da); 1517 if (error) 1518 goto out_end_trans; 1519 1520 out_end_trans: 1521 gfs2_trans_end(sdp); 1522 out_ipreserv: 1523 if (da.nr_blocks) 1524 gfs2_inplace_release(ndip); 1525 out_gunlock_q: 1526 if (da.nr_blocks) 1527 gfs2_quota_unlock(ndip); 1528 out_gunlock: 1529 gfs2_dir_no_add(&da); 1530 while (x--) { 1531 gfs2_glock_dq(ghs + x); 1532 gfs2_holder_uninit(ghs + x); 1533 } 1534 out_gunlock_r: 1535 if (r_gh.gh_gl) 1536 gfs2_glock_dq_uninit(&r_gh); 1537 out: 1538 return error; 1539 } 1540 1541 /** 1542 * gfs2_follow_link - Follow a symbolic link 1543 * @dentry: The dentry of the link 1544 * @nd: Data that we pass to vfs_follow_link() 1545 * 1546 * This can handle symlinks of any size. 1547 * 1548 * Returns: 0 on success or error code 1549 */ 1550 1551 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd) 1552 { 1553 struct gfs2_inode *ip = GFS2_I(d_inode(dentry)); 1554 struct gfs2_holder i_gh; 1555 struct buffer_head *dibh; 1556 unsigned int size; 1557 char *buf; 1558 int error; 1559 1560 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); 1561 error = gfs2_glock_nq(&i_gh); 1562 if (error) { 1563 gfs2_holder_uninit(&i_gh); 1564 nd_set_link(nd, ERR_PTR(error)); 1565 return NULL; 1566 } 1567 1568 size = (unsigned int)i_size_read(&ip->i_inode); 1569 if (size == 0) { 1570 gfs2_consist_inode(ip); 1571 buf = ERR_PTR(-EIO); 1572 goto out; 1573 } 1574 1575 error = gfs2_meta_inode_buffer(ip, &dibh); 1576 if (error) { 1577 buf = ERR_PTR(error); 1578 goto out; 1579 } 1580 1581 buf = kzalloc(size + 1, GFP_NOFS); 1582 if (!buf) 1583 buf = ERR_PTR(-ENOMEM); 1584 else 1585 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size); 1586 brelse(dibh); 1587 out: 1588 gfs2_glock_dq_uninit(&i_gh); 1589 nd_set_link(nd, buf); 1590 return NULL; 1591 } 1592 1593 /** 1594 * gfs2_permission - 1595 * @inode: The inode 1596 * @mask: The mask to be tested 1597 * @flags: Indicates whether this is an RCU path walk or not 1598 * 1599 * This may be called from the VFS directly, or from within GFS2 with the 1600 * inode locked, so we look to see if the glock is already locked and only 1601 * lock the glock if its not already been done. 1602 * 1603 * Returns: errno 1604 */ 1605 1606 int gfs2_permission(struct inode *inode, int mask) 1607 { 1608 struct gfs2_inode *ip; 1609 struct gfs2_holder i_gh; 1610 int error; 1611 int unlock = 0; 1612 1613 1614 ip = GFS2_I(inode); 1615 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 1616 if (mask & MAY_NOT_BLOCK) 1617 return -ECHILD; 1618 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); 1619 if (error) 1620 return error; 1621 unlock = 1; 1622 } 1623 1624 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode)) 1625 error = -EACCES; 1626 else 1627 error = generic_permission(inode, mask); 1628 if (unlock) 1629 gfs2_glock_dq_uninit(&i_gh); 1630 1631 return error; 1632 } 1633 1634 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1635 { 1636 setattr_copy(inode, attr); 1637 mark_inode_dirty(inode); 1638 return 0; 1639 } 1640 1641 /** 1642 * gfs2_setattr_simple - 1643 * @ip: 1644 * @attr: 1645 * 1646 * Returns: errno 1647 */ 1648 1649 int gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1650 { 1651 int error; 1652 1653 if (current->journal_info) 1654 return __gfs2_setattr_simple(inode, attr); 1655 1656 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0); 1657 if (error) 1658 return error; 1659 1660 error = __gfs2_setattr_simple(inode, attr); 1661 gfs2_trans_end(GFS2_SB(inode)); 1662 return error; 1663 } 1664 1665 static int setattr_chown(struct inode *inode, struct iattr *attr) 1666 { 1667 struct gfs2_inode *ip = GFS2_I(inode); 1668 struct gfs2_sbd *sdp = GFS2_SB(inode); 1669 kuid_t ouid, nuid; 1670 kgid_t ogid, ngid; 1671 int error; 1672 struct gfs2_alloc_parms ap; 1673 1674 ouid = inode->i_uid; 1675 ogid = inode->i_gid; 1676 nuid = attr->ia_uid; 1677 ngid = attr->ia_gid; 1678 1679 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid)) 1680 ouid = nuid = NO_UID_QUOTA_CHANGE; 1681 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid)) 1682 ogid = ngid = NO_GID_QUOTA_CHANGE; 1683 1684 error = get_write_access(inode); 1685 if (error) 1686 return error; 1687 1688 error = gfs2_rs_alloc(ip); 1689 if (error) 1690 goto out; 1691 1692 error = gfs2_rindex_update(sdp); 1693 if (error) 1694 goto out; 1695 1696 error = gfs2_quota_lock(ip, nuid, ngid); 1697 if (error) 1698 goto out; 1699 1700 ap.target = gfs2_get_inode_blocks(&ip->i_inode); 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, &ap); 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 gfs2_quota_change(ip, -ap.target, ouid, ogid); 1720 gfs2_quota_change(ip, ap.target, nuid, ngid); 1721 } 1722 1723 out_end_trans: 1724 gfs2_trans_end(sdp); 1725 out_gunlock_q: 1726 gfs2_quota_unlock(ip); 1727 out: 1728 put_write_access(inode); 1729 return error; 1730 } 1731 1732 /** 1733 * gfs2_setattr - Change attributes on an inode 1734 * @dentry: The dentry which is changing 1735 * @attr: The structure describing the change 1736 * 1737 * The VFS layer wants to change one or more of an inodes attributes. Write 1738 * that change out to disk. 1739 * 1740 * Returns: errno 1741 */ 1742 1743 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr) 1744 { 1745 struct inode *inode = d_inode(dentry); 1746 struct gfs2_inode *ip = GFS2_I(inode); 1747 struct gfs2_holder i_gh; 1748 int error; 1749 1750 error = gfs2_rs_alloc(ip); 1751 if (error) 1752 return error; 1753 1754 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); 1755 if (error) 1756 return error; 1757 1758 error = -EPERM; 1759 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 1760 goto out; 1761 1762 error = inode_change_ok(inode, attr); 1763 if (error) 1764 goto out; 1765 1766 if (attr->ia_valid & ATTR_SIZE) 1767 error = gfs2_setattr_size(inode, attr->ia_size); 1768 else if (attr->ia_valid & (ATTR_UID | ATTR_GID)) 1769 error = setattr_chown(inode, attr); 1770 else { 1771 error = gfs2_setattr_simple(inode, attr); 1772 if (!error && attr->ia_valid & ATTR_MODE) 1773 error = posix_acl_chmod(inode, inode->i_mode); 1774 } 1775 1776 out: 1777 if (!error) 1778 mark_inode_dirty(inode); 1779 gfs2_glock_dq_uninit(&i_gh); 1780 return error; 1781 } 1782 1783 /** 1784 * gfs2_getattr - Read out an inode's attributes 1785 * @mnt: The vfsmount the inode is being accessed from 1786 * @dentry: The dentry to stat 1787 * @stat: The inode's stats 1788 * 1789 * This may be called from the VFS directly, or from within GFS2 with the 1790 * inode locked, so we look to see if the glock is already locked and only 1791 * lock the glock if its not already been done. Note that its the NFS 1792 * readdirplus operation which causes this to be called (from filldir) 1793 * with the glock already held. 1794 * 1795 * Returns: errno 1796 */ 1797 1798 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry, 1799 struct kstat *stat) 1800 { 1801 struct inode *inode = d_inode(dentry); 1802 struct gfs2_inode *ip = GFS2_I(inode); 1803 struct gfs2_holder gh; 1804 int error; 1805 int unlock = 0; 1806 1807 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 1808 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 1809 if (error) 1810 return error; 1811 unlock = 1; 1812 } 1813 1814 generic_fillattr(inode, stat); 1815 if (unlock) 1816 gfs2_glock_dq_uninit(&gh); 1817 1818 return 0; 1819 } 1820 1821 static int gfs2_setxattr(struct dentry *dentry, const char *name, 1822 const void *data, size_t size, int flags) 1823 { 1824 struct inode *inode = d_inode(dentry); 1825 struct gfs2_inode *ip = GFS2_I(inode); 1826 struct gfs2_holder gh; 1827 int ret; 1828 1829 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 1830 ret = gfs2_glock_nq(&gh); 1831 if (ret == 0) { 1832 ret = gfs2_rs_alloc(ip); 1833 if (ret == 0) 1834 ret = generic_setxattr(dentry, name, data, size, flags); 1835 gfs2_glock_dq(&gh); 1836 } 1837 gfs2_holder_uninit(&gh); 1838 return ret; 1839 } 1840 1841 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name, 1842 void *data, size_t size) 1843 { 1844 struct inode *inode = d_inode(dentry); 1845 struct gfs2_inode *ip = GFS2_I(inode); 1846 struct gfs2_holder gh; 1847 int ret; 1848 1849 /* For selinux during lookup */ 1850 if (gfs2_glock_is_locked_by_me(ip->i_gl)) 1851 return generic_getxattr(dentry, name, data, size); 1852 1853 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 1854 ret = gfs2_glock_nq(&gh); 1855 if (ret == 0) { 1856 ret = generic_getxattr(dentry, name, data, size); 1857 gfs2_glock_dq(&gh); 1858 } 1859 gfs2_holder_uninit(&gh); 1860 return ret; 1861 } 1862 1863 static int gfs2_removexattr(struct dentry *dentry, const char *name) 1864 { 1865 struct inode *inode = d_inode(dentry); 1866 struct gfs2_inode *ip = GFS2_I(inode); 1867 struct gfs2_holder gh; 1868 int ret; 1869 1870 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 1871 ret = gfs2_glock_nq(&gh); 1872 if (ret == 0) { 1873 ret = gfs2_rs_alloc(ip); 1874 if (ret == 0) 1875 ret = generic_removexattr(dentry, name); 1876 gfs2_glock_dq(&gh); 1877 } 1878 gfs2_holder_uninit(&gh); 1879 return ret; 1880 } 1881 1882 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 1883 u64 start, u64 len) 1884 { 1885 struct gfs2_inode *ip = GFS2_I(inode); 1886 struct gfs2_holder gh; 1887 int ret; 1888 1889 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC); 1890 if (ret) 1891 return ret; 1892 1893 mutex_lock(&inode->i_mutex); 1894 1895 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 1896 if (ret) 1897 goto out; 1898 1899 if (gfs2_is_stuffed(ip)) { 1900 u64 phys = ip->i_no_addr << inode->i_blkbits; 1901 u64 size = i_size_read(inode); 1902 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED| 1903 FIEMAP_EXTENT_DATA_INLINE; 1904 phys += sizeof(struct gfs2_dinode); 1905 phys += start; 1906 if (start + len > size) 1907 len = size - start; 1908 if (start < size) 1909 ret = fiemap_fill_next_extent(fieinfo, start, phys, 1910 len, flags); 1911 if (ret == 1) 1912 ret = 0; 1913 } else { 1914 ret = __generic_block_fiemap(inode, fieinfo, start, len, 1915 gfs2_block_map); 1916 } 1917 1918 gfs2_glock_dq_uninit(&gh); 1919 out: 1920 mutex_unlock(&inode->i_mutex); 1921 return ret; 1922 } 1923 1924 const struct inode_operations gfs2_file_iops = { 1925 .permission = gfs2_permission, 1926 .setattr = gfs2_setattr, 1927 .getattr = gfs2_getattr, 1928 .setxattr = gfs2_setxattr, 1929 .getxattr = gfs2_getxattr, 1930 .listxattr = gfs2_listxattr, 1931 .removexattr = gfs2_removexattr, 1932 .fiemap = gfs2_fiemap, 1933 .get_acl = gfs2_get_acl, 1934 .set_acl = gfs2_set_acl, 1935 }; 1936 1937 const struct inode_operations gfs2_dir_iops = { 1938 .create = gfs2_create, 1939 .lookup = gfs2_lookup, 1940 .link = gfs2_link, 1941 .unlink = gfs2_unlink, 1942 .symlink = gfs2_symlink, 1943 .mkdir = gfs2_mkdir, 1944 .rmdir = gfs2_unlink, 1945 .mknod = gfs2_mknod, 1946 .rename = gfs2_rename, 1947 .permission = gfs2_permission, 1948 .setattr = gfs2_setattr, 1949 .getattr = gfs2_getattr, 1950 .setxattr = gfs2_setxattr, 1951 .getxattr = gfs2_getxattr, 1952 .listxattr = gfs2_listxattr, 1953 .removexattr = gfs2_removexattr, 1954 .fiemap = gfs2_fiemap, 1955 .get_acl = gfs2_get_acl, 1956 .set_acl = gfs2_set_acl, 1957 .atomic_open = gfs2_atomic_open, 1958 }; 1959 1960 const struct inode_operations gfs2_symlink_iops = { 1961 .readlink = generic_readlink, 1962 .follow_link = gfs2_follow_link, 1963 .put_link = kfree_put_link, 1964 .permission = gfs2_permission, 1965 .setattr = gfs2_setattr, 1966 .getattr = gfs2_getattr, 1967 .setxattr = gfs2_setxattr, 1968 .getxattr = gfs2_getxattr, 1969 .listxattr = gfs2_listxattr, 1970 .removexattr = gfs2_removexattr, 1971 .fiemap = gfs2_fiemap, 1972 }; 1973 1974