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 struct dentry *d; 600 int error, free_vfs_inode = 0; 601 u32 aflags = 0; 602 unsigned blocks = 1; 603 struct gfs2_diradd da = { .bh = NULL, }; 604 605 if (!name->len || name->len > GFS2_FNAMESIZE) 606 return -ENAMETOOLONG; 607 608 error = gfs2_rs_alloc(dip); 609 if (error) 610 return error; 611 612 error = gfs2_rindex_update(sdp); 613 if (error) 614 return error; 615 616 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 617 if (error) 618 goto fail; 619 620 error = create_ok(dip, name, mode); 621 if (error) 622 goto fail_gunlock; 623 624 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl); 625 error = PTR_ERR(inode); 626 if (!IS_ERR(inode)) { 627 d = d_splice_alias(inode, dentry); 628 error = PTR_ERR(d); 629 if (IS_ERR(d)) 630 goto fail_gunlock; 631 error = 0; 632 if (file) { 633 if (S_ISREG(inode->i_mode)) { 634 WARN_ON(d != NULL); 635 error = finish_open(file, dentry, gfs2_open_common, opened); 636 } else { 637 error = finish_no_open(file, d); 638 } 639 } else { 640 dput(d); 641 } 642 gfs2_glock_dq_uninit(ghs); 643 return error; 644 } else if (error != -ENOENT) { 645 goto fail_gunlock; 646 } 647 648 error = gfs2_diradd_alloc_required(dir, name, &da); 649 if (error < 0) 650 goto fail_gunlock; 651 652 inode = new_inode(sdp->sd_vfs); 653 error = -ENOMEM; 654 if (!inode) 655 goto fail_gunlock; 656 657 error = posix_acl_create(dir, &mode, &default_acl, &acl); 658 if (error) 659 goto fail_free_vfs_inode; 660 661 ip = GFS2_I(inode); 662 error = gfs2_rs_alloc(ip); 663 if (error) 664 goto fail_free_acls; 665 666 inode->i_mode = mode; 667 set_nlink(inode, S_ISDIR(mode) ? 2 : 1); 668 inode->i_rdev = dev; 669 inode->i_size = size; 670 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 671 gfs2_set_inode_blocks(inode, 1); 672 munge_mode_uid_gid(dip, inode); 673 ip->i_goal = dip->i_goal; 674 ip->i_diskflags = 0; 675 ip->i_eattr = 0; 676 ip->i_height = 0; 677 ip->i_depth = 0; 678 ip->i_entries = 0; 679 680 switch(mode & S_IFMT) { 681 case S_IFREG: 682 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) || 683 gfs2_tune_get(sdp, gt_new_files_jdata)) 684 ip->i_diskflags |= GFS2_DIF_JDATA; 685 gfs2_set_aops(inode); 686 break; 687 case S_IFDIR: 688 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA); 689 ip->i_diskflags |= GFS2_DIF_JDATA; 690 ip->i_entries = 2; 691 break; 692 } 693 gfs2_set_inode_flags(inode); 694 695 if ((GFS2_I(sdp->sd_root_dir->d_inode) == dip) || 696 (dip->i_diskflags & GFS2_DIF_TOPDIR)) 697 aflags |= GFS2_AF_ORLOV; 698 699 if (default_acl || acl) 700 blocks++; 701 702 error = alloc_dinode(ip, aflags, &blocks); 703 if (error) 704 goto fail_free_inode; 705 706 gfs2_set_inode_blocks(inode, blocks); 707 708 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); 709 if (error) 710 goto fail_free_inode; 711 712 ip->i_gl->gl_object = ip; 713 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1); 714 if (error) 715 goto fail_free_inode; 716 717 error = gfs2_trans_begin(sdp, blocks, 0); 718 if (error) 719 goto fail_gunlock2; 720 721 if (blocks > 1) { 722 ip->i_eattr = ip->i_no_addr + 1; 723 gfs2_init_xattr(ip); 724 } 725 init_dinode(dip, ip, symname); 726 gfs2_trans_end(sdp); 727 728 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl); 729 if (error) 730 goto fail_gunlock2; 731 732 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); 733 if (error) 734 goto fail_gunlock2; 735 736 ip->i_iopen_gh.gh_gl->gl_object = ip; 737 gfs2_glock_put(io_gl); 738 gfs2_set_iop(inode); 739 insert_inode_hash(inode); 740 741 if (default_acl) { 742 error = gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT); 743 posix_acl_release(default_acl); 744 } 745 if (acl) { 746 if (!error) 747 error = gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS); 748 posix_acl_release(acl); 749 } 750 751 if (error) 752 goto fail_gunlock3; 753 754 error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name, 755 &gfs2_initxattrs, NULL); 756 if (error) 757 goto fail_gunlock3; 758 759 error = link_dinode(dip, name, ip, &da); 760 if (error) 761 goto fail_gunlock3; 762 763 mark_inode_dirty(inode); 764 d_instantiate(dentry, inode); 765 if (file) { 766 *opened |= FILE_CREATED; 767 error = finish_open(file, dentry, gfs2_open_common, opened); 768 } 769 gfs2_glock_dq_uninit(ghs); 770 gfs2_glock_dq_uninit(ghs + 1); 771 return error; 772 773 fail_gunlock3: 774 gfs2_glock_dq_uninit(ghs + 1); 775 if (ip->i_gl) 776 gfs2_glock_put(ip->i_gl); 777 goto fail_gunlock; 778 779 fail_gunlock2: 780 gfs2_glock_dq_uninit(ghs + 1); 781 fail_free_inode: 782 if (ip->i_gl) 783 gfs2_glock_put(ip->i_gl); 784 gfs2_rs_delete(ip, NULL); 785 fail_free_acls: 786 if (default_acl) 787 posix_acl_release(default_acl); 788 if (acl) 789 posix_acl_release(acl); 790 fail_free_vfs_inode: 791 free_vfs_inode = 1; 792 fail_gunlock: 793 gfs2_dir_no_add(&da); 794 gfs2_glock_dq_uninit(ghs); 795 if (inode && !IS_ERR(inode)) { 796 clear_nlink(inode); 797 if (!free_vfs_inode) 798 mark_inode_dirty(inode); 799 set_bit(free_vfs_inode ? GIF_FREE_VFS_INODE : GIF_ALLOC_FAILED, 800 &GFS2_I(inode)->i_flags); 801 iput(inode); 802 } 803 fail: 804 return error; 805 } 806 807 /** 808 * gfs2_create - Create a file 809 * @dir: The directory in which to create the file 810 * @dentry: The dentry of the new file 811 * @mode: The mode of the new file 812 * 813 * Returns: errno 814 */ 815 816 static int gfs2_create(struct inode *dir, struct dentry *dentry, 817 umode_t mode, bool excl) 818 { 819 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl, NULL); 820 } 821 822 /** 823 * __gfs2_lookup - Look up a filename in a directory and return its inode 824 * @dir: The directory inode 825 * @dentry: The dentry of the new inode 826 * @file: File to be opened 827 * @opened: atomic_open flags 828 * 829 * 830 * Returns: errno 831 */ 832 833 static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry, 834 struct file *file, int *opened) 835 { 836 struct inode *inode; 837 struct dentry *d; 838 struct gfs2_holder gh; 839 struct gfs2_glock *gl; 840 int error; 841 842 inode = gfs2_lookupi(dir, &dentry->d_name, 0); 843 if (inode == NULL) { 844 d_add(dentry, NULL); 845 return NULL; 846 } 847 if (IS_ERR(inode)) 848 return ERR_CAST(inode); 849 850 gl = GFS2_I(inode)->i_gl; 851 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 852 if (error) { 853 iput(inode); 854 return ERR_PTR(error); 855 } 856 857 d = d_splice_alias(inode, dentry); 858 if (IS_ERR(d)) { 859 iput(inode); 860 gfs2_glock_dq_uninit(&gh); 861 return d; 862 } 863 if (file && S_ISREG(inode->i_mode)) 864 error = finish_open(file, dentry, gfs2_open_common, opened); 865 866 gfs2_glock_dq_uninit(&gh); 867 if (error) { 868 dput(d); 869 return ERR_PTR(error); 870 } 871 return d; 872 } 873 874 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry, 875 unsigned flags) 876 { 877 return __gfs2_lookup(dir, dentry, NULL, NULL); 878 } 879 880 /** 881 * gfs2_link - Link to a file 882 * @old_dentry: The inode to link 883 * @dir: Add link to this directory 884 * @dentry: The name of the link 885 * 886 * Link the inode in "old_dentry" into the directory "dir" with the 887 * name in "dentry". 888 * 889 * Returns: errno 890 */ 891 892 static int gfs2_link(struct dentry *old_dentry, struct inode *dir, 893 struct dentry *dentry) 894 { 895 struct gfs2_inode *dip = GFS2_I(dir); 896 struct gfs2_sbd *sdp = GFS2_SB(dir); 897 struct inode *inode = old_dentry->d_inode; 898 struct gfs2_inode *ip = GFS2_I(inode); 899 struct gfs2_holder ghs[2]; 900 struct buffer_head *dibh; 901 struct gfs2_diradd da = { .bh = NULL, }; 902 int error; 903 904 if (S_ISDIR(inode->i_mode)) 905 return -EPERM; 906 907 error = gfs2_rs_alloc(dip); 908 if (error) 909 return error; 910 911 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 912 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); 913 914 error = gfs2_glock_nq(ghs); /* parent */ 915 if (error) 916 goto out_parent; 917 918 error = gfs2_glock_nq(ghs + 1); /* child */ 919 if (error) 920 goto out_child; 921 922 error = -ENOENT; 923 if (inode->i_nlink == 0) 924 goto out_gunlock; 925 926 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC); 927 if (error) 928 goto out_gunlock; 929 930 error = gfs2_dir_check(dir, &dentry->d_name, NULL); 931 switch (error) { 932 case -ENOENT: 933 break; 934 case 0: 935 error = -EEXIST; 936 default: 937 goto out_gunlock; 938 } 939 940 error = -EINVAL; 941 if (!dip->i_inode.i_nlink) 942 goto out_gunlock; 943 error = -EFBIG; 944 if (dip->i_entries == (u32)-1) 945 goto out_gunlock; 946 error = -EPERM; 947 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 948 goto out_gunlock; 949 error = -EINVAL; 950 if (!ip->i_inode.i_nlink) 951 goto out_gunlock; 952 error = -EMLINK; 953 if (ip->i_inode.i_nlink == (u32)-1) 954 goto out_gunlock; 955 956 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da); 957 if (error < 0) 958 goto out_gunlock; 959 960 if (da.nr_blocks) { 961 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, }; 962 error = gfs2_quota_lock_check(dip); 963 if (error) 964 goto out_gunlock; 965 966 error = gfs2_inplace_reserve(dip, &ap); 967 if (error) 968 goto out_gunlock_q; 969 970 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0); 971 if (error) 972 goto out_ipres; 973 } else { 974 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0); 975 if (error) 976 goto out_ipres; 977 } 978 979 error = gfs2_meta_inode_buffer(ip, &dibh); 980 if (error) 981 goto out_end_trans; 982 983 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da); 984 if (error) 985 goto out_brelse; 986 987 gfs2_trans_add_meta(ip->i_gl, dibh); 988 inc_nlink(&ip->i_inode); 989 ip->i_inode.i_ctime = CURRENT_TIME; 990 ihold(inode); 991 d_instantiate(dentry, inode); 992 mark_inode_dirty(inode); 993 994 out_brelse: 995 brelse(dibh); 996 out_end_trans: 997 gfs2_trans_end(sdp); 998 out_ipres: 999 if (da.nr_blocks) 1000 gfs2_inplace_release(dip); 1001 out_gunlock_q: 1002 if (da.nr_blocks) 1003 gfs2_quota_unlock(dip); 1004 out_gunlock: 1005 gfs2_dir_no_add(&da); 1006 gfs2_glock_dq(ghs + 1); 1007 out_child: 1008 gfs2_glock_dq(ghs); 1009 out_parent: 1010 gfs2_holder_uninit(ghs); 1011 gfs2_holder_uninit(ghs + 1); 1012 return error; 1013 } 1014 1015 /* 1016 * gfs2_unlink_ok - check to see that a inode is still in a directory 1017 * @dip: the directory 1018 * @name: the name of the file 1019 * @ip: the inode 1020 * 1021 * Assumes that the lock on (at least) @dip is held. 1022 * 1023 * Returns: 0 if the parent/child relationship is correct, errno if it isn't 1024 */ 1025 1026 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, 1027 const struct gfs2_inode *ip) 1028 { 1029 int error; 1030 1031 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) 1032 return -EPERM; 1033 1034 if ((dip->i_inode.i_mode & S_ISVTX) && 1035 !uid_eq(dip->i_inode.i_uid, current_fsuid()) && 1036 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER)) 1037 return -EPERM; 1038 1039 if (IS_APPEND(&dip->i_inode)) 1040 return -EPERM; 1041 1042 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC); 1043 if (error) 1044 return error; 1045 1046 error = gfs2_dir_check(&dip->i_inode, name, ip); 1047 if (error) 1048 return error; 1049 1050 return 0; 1051 } 1052 1053 /** 1054 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it 1055 * @dip: The parent directory 1056 * @name: The name of the entry in the parent directory 1057 * @inode: The inode to be removed 1058 * 1059 * Called with all the locks and in a transaction. This will only be 1060 * called for a directory after it has been checked to ensure it is empty. 1061 * 1062 * Returns: 0 on success, or an error 1063 */ 1064 1065 static int gfs2_unlink_inode(struct gfs2_inode *dip, 1066 const struct dentry *dentry) 1067 { 1068 struct inode *inode = dentry->d_inode; 1069 struct gfs2_inode *ip = GFS2_I(inode); 1070 int error; 1071 1072 error = gfs2_dir_del(dip, dentry); 1073 if (error) 1074 return error; 1075 1076 ip->i_entries = 0; 1077 inode->i_ctime = CURRENT_TIME; 1078 if (S_ISDIR(inode->i_mode)) 1079 clear_nlink(inode); 1080 else 1081 drop_nlink(inode); 1082 mark_inode_dirty(inode); 1083 if (inode->i_nlink == 0) 1084 gfs2_unlink_di(inode); 1085 return 0; 1086 } 1087 1088 1089 /** 1090 * gfs2_unlink - Unlink an inode (this does rmdir as well) 1091 * @dir: The inode of the directory containing the inode to unlink 1092 * @dentry: The file itself 1093 * 1094 * This routine uses the type of the inode as a flag to figure out 1095 * whether this is an unlink or an rmdir. 1096 * 1097 * Returns: errno 1098 */ 1099 1100 static int gfs2_unlink(struct inode *dir, struct dentry *dentry) 1101 { 1102 struct gfs2_inode *dip = GFS2_I(dir); 1103 struct gfs2_sbd *sdp = GFS2_SB(dir); 1104 struct inode *inode = dentry->d_inode; 1105 struct gfs2_inode *ip = GFS2_I(inode); 1106 struct gfs2_holder ghs[3]; 1107 struct gfs2_rgrpd *rgd; 1108 int error; 1109 1110 error = gfs2_rindex_update(sdp); 1111 if (error) 1112 return error; 1113 1114 error = -EROFS; 1115 1116 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 1117 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); 1118 1119 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1); 1120 if (!rgd) 1121 goto out_inodes; 1122 1123 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2); 1124 1125 1126 error = gfs2_glock_nq(ghs); /* parent */ 1127 if (error) 1128 goto out_parent; 1129 1130 error = gfs2_glock_nq(ghs + 1); /* child */ 1131 if (error) 1132 goto out_child; 1133 1134 error = -ENOENT; 1135 if (inode->i_nlink == 0) 1136 goto out_rgrp; 1137 1138 if (S_ISDIR(inode->i_mode)) { 1139 error = -ENOTEMPTY; 1140 if (ip->i_entries > 2 || inode->i_nlink > 2) 1141 goto out_rgrp; 1142 } 1143 1144 error = gfs2_glock_nq(ghs + 2); /* rgrp */ 1145 if (error) 1146 goto out_rgrp; 1147 1148 error = gfs2_unlink_ok(dip, &dentry->d_name, ip); 1149 if (error) 1150 goto out_gunlock; 1151 1152 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0); 1153 if (error) 1154 goto out_end_trans; 1155 1156 error = gfs2_unlink_inode(dip, dentry); 1157 1158 out_end_trans: 1159 gfs2_trans_end(sdp); 1160 out_gunlock: 1161 gfs2_glock_dq(ghs + 2); 1162 out_rgrp: 1163 gfs2_glock_dq(ghs + 1); 1164 out_child: 1165 gfs2_glock_dq(ghs); 1166 out_parent: 1167 gfs2_holder_uninit(ghs + 2); 1168 out_inodes: 1169 gfs2_holder_uninit(ghs + 1); 1170 gfs2_holder_uninit(ghs); 1171 return error; 1172 } 1173 1174 /** 1175 * gfs2_symlink - Create a symlink 1176 * @dir: The directory to create the symlink in 1177 * @dentry: The dentry to put the symlink in 1178 * @symname: The thing which the link points to 1179 * 1180 * Returns: errno 1181 */ 1182 1183 static int gfs2_symlink(struct inode *dir, struct dentry *dentry, 1184 const char *symname) 1185 { 1186 struct gfs2_sbd *sdp = GFS2_SB(dir); 1187 unsigned int size; 1188 1189 size = strlen(symname); 1190 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1) 1191 return -ENAMETOOLONG; 1192 1193 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0, NULL); 1194 } 1195 1196 /** 1197 * gfs2_mkdir - Make a directory 1198 * @dir: The parent directory of the new one 1199 * @dentry: The dentry of the new directory 1200 * @mode: The mode of the new directory 1201 * 1202 * Returns: errno 1203 */ 1204 1205 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 1206 { 1207 struct gfs2_sbd *sdp = GFS2_SB(dir); 1208 unsigned dsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode); 1209 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0, NULL); 1210 } 1211 1212 /** 1213 * gfs2_mknod - Make a special file 1214 * @dir: The directory in which the special file will reside 1215 * @dentry: The dentry of the special file 1216 * @mode: The mode of the special file 1217 * @dev: The device specification of the special file 1218 * 1219 */ 1220 1221 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, 1222 dev_t dev) 1223 { 1224 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0, NULL); 1225 } 1226 1227 /** 1228 * gfs2_atomic_open - Atomically open a file 1229 * @dir: The directory 1230 * @dentry: The proposed new entry 1231 * @file: The proposed new struct file 1232 * @flags: open flags 1233 * @mode: File mode 1234 * @opened: Flag to say whether the file has been opened or not 1235 * 1236 * Returns: error code or 0 for success 1237 */ 1238 1239 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry, 1240 struct file *file, unsigned flags, 1241 umode_t mode, int *opened) 1242 { 1243 struct dentry *d; 1244 bool excl = !!(flags & O_EXCL); 1245 1246 d = __gfs2_lookup(dir, dentry, file, opened); 1247 if (IS_ERR(d)) 1248 return PTR_ERR(d); 1249 if (d != NULL) 1250 dentry = d; 1251 if (dentry->d_inode) { 1252 if (!(*opened & FILE_OPENED)) { 1253 if (d == NULL) 1254 dget(dentry); 1255 return finish_no_open(file, dentry); 1256 } 1257 dput(d); 1258 return 0; 1259 } 1260 1261 BUG_ON(d != NULL); 1262 if (!(flags & O_CREAT)) 1263 return -ENOENT; 1264 1265 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl, opened); 1266 } 1267 1268 /* 1269 * gfs2_ok_to_move - check if it's ok to move a directory to another directory 1270 * @this: move this 1271 * @to: to here 1272 * 1273 * Follow @to back to the root and make sure we don't encounter @this 1274 * Assumes we already hold the rename lock. 1275 * 1276 * Returns: errno 1277 */ 1278 1279 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) 1280 { 1281 struct inode *dir = &to->i_inode; 1282 struct super_block *sb = dir->i_sb; 1283 struct inode *tmp; 1284 int error = 0; 1285 1286 igrab(dir); 1287 1288 for (;;) { 1289 if (dir == &this->i_inode) { 1290 error = -EINVAL; 1291 break; 1292 } 1293 if (dir == sb->s_root->d_inode) { 1294 error = 0; 1295 break; 1296 } 1297 1298 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1); 1299 if (!tmp) { 1300 error = -ENOENT; 1301 break; 1302 } 1303 if (IS_ERR(tmp)) { 1304 error = PTR_ERR(tmp); 1305 break; 1306 } 1307 1308 iput(dir); 1309 dir = tmp; 1310 } 1311 1312 iput(dir); 1313 1314 return error; 1315 } 1316 1317 /** 1318 * gfs2_rename - Rename a file 1319 * @odir: Parent directory of old file name 1320 * @odentry: The old dentry of the file 1321 * @ndir: Parent directory of new file name 1322 * @ndentry: The new dentry of the file 1323 * 1324 * Returns: errno 1325 */ 1326 1327 static int gfs2_rename(struct inode *odir, struct dentry *odentry, 1328 struct inode *ndir, struct dentry *ndentry) 1329 { 1330 struct gfs2_inode *odip = GFS2_I(odir); 1331 struct gfs2_inode *ndip = GFS2_I(ndir); 1332 struct gfs2_inode *ip = GFS2_I(odentry->d_inode); 1333 struct gfs2_inode *nip = NULL; 1334 struct gfs2_sbd *sdp = GFS2_SB(odir); 1335 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, }; 1336 struct gfs2_rgrpd *nrgd; 1337 unsigned int num_gh; 1338 int dir_rename = 0; 1339 struct gfs2_diradd da = { .nr_blocks = 0, }; 1340 unsigned int x; 1341 int error; 1342 1343 if (ndentry->d_inode) { 1344 nip = GFS2_I(ndentry->d_inode); 1345 if (ip == nip) 1346 return 0; 1347 } 1348 1349 error = gfs2_rindex_update(sdp); 1350 if (error) 1351 return error; 1352 1353 error = gfs2_rs_alloc(ndip); 1354 if (error) 1355 return error; 1356 1357 if (odip != ndip) { 1358 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 1359 0, &r_gh); 1360 if (error) 1361 goto out; 1362 1363 if (S_ISDIR(ip->i_inode.i_mode)) { 1364 dir_rename = 1; 1365 /* don't move a dirctory into it's subdir */ 1366 error = gfs2_ok_to_move(ip, ndip); 1367 if (error) 1368 goto out_gunlock_r; 1369 } 1370 } 1371 1372 num_gh = 1; 1373 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 1374 if (odip != ndip) { 1375 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1376 num_gh++; 1377 } 1378 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1379 num_gh++; 1380 1381 if (nip) { 1382 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1383 num_gh++; 1384 /* grab the resource lock for unlink flag twiddling 1385 * this is the case of the target file already existing 1386 * so we unlink before doing the rename 1387 */ 1388 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1); 1389 if (nrgd) 1390 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++); 1391 } 1392 1393 for (x = 0; x < num_gh; x++) { 1394 error = gfs2_glock_nq(ghs + x); 1395 if (error) 1396 goto out_gunlock; 1397 } 1398 1399 error = -ENOENT; 1400 if (ip->i_inode.i_nlink == 0) 1401 goto out_gunlock; 1402 1403 /* Check out the old directory */ 1404 1405 error = gfs2_unlink_ok(odip, &odentry->d_name, ip); 1406 if (error) 1407 goto out_gunlock; 1408 1409 /* Check out the new directory */ 1410 1411 if (nip) { 1412 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); 1413 if (error) 1414 goto out_gunlock; 1415 1416 if (nip->i_inode.i_nlink == 0) { 1417 error = -EAGAIN; 1418 goto out_gunlock; 1419 } 1420 1421 if (S_ISDIR(nip->i_inode.i_mode)) { 1422 if (nip->i_entries < 2) { 1423 gfs2_consist_inode(nip); 1424 error = -EIO; 1425 goto out_gunlock; 1426 } 1427 if (nip->i_entries > 2) { 1428 error = -ENOTEMPTY; 1429 goto out_gunlock; 1430 } 1431 } 1432 } else { 1433 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC); 1434 if (error) 1435 goto out_gunlock; 1436 1437 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL); 1438 switch (error) { 1439 case -ENOENT: 1440 error = 0; 1441 break; 1442 case 0: 1443 error = -EEXIST; 1444 default: 1445 goto out_gunlock; 1446 }; 1447 1448 if (odip != ndip) { 1449 if (!ndip->i_inode.i_nlink) { 1450 error = -ENOENT; 1451 goto out_gunlock; 1452 } 1453 if (ndip->i_entries == (u32)-1) { 1454 error = -EFBIG; 1455 goto out_gunlock; 1456 } 1457 if (S_ISDIR(ip->i_inode.i_mode) && 1458 ndip->i_inode.i_nlink == (u32)-1) { 1459 error = -EMLINK; 1460 goto out_gunlock; 1461 } 1462 } 1463 } 1464 1465 /* Check out the dir to be renamed */ 1466 1467 if (dir_rename) { 1468 error = gfs2_permission(odentry->d_inode, MAY_WRITE); 1469 if (error) 1470 goto out_gunlock; 1471 } 1472 1473 if (nip == NULL) { 1474 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da); 1475 if (error) 1476 goto out_gunlock; 1477 } 1478 1479 if (da.nr_blocks) { 1480 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, }; 1481 error = gfs2_quota_lock_check(ndip); 1482 if (error) 1483 goto out_gunlock; 1484 1485 error = gfs2_inplace_reserve(ndip, &ap); 1486 if (error) 1487 goto out_gunlock_q; 1488 1489 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) + 1490 4 * RES_LEAF + 4, 0); 1491 if (error) 1492 goto out_ipreserv; 1493 } else { 1494 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 1495 5 * RES_LEAF + 4, 0); 1496 if (error) 1497 goto out_gunlock; 1498 } 1499 1500 /* Remove the target file, if it exists */ 1501 1502 if (nip) 1503 error = gfs2_unlink_inode(ndip, ndentry); 1504 1505 if (dir_rename) { 1506 error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR); 1507 if (error) 1508 goto out_end_trans; 1509 } else { 1510 struct buffer_head *dibh; 1511 error = gfs2_meta_inode_buffer(ip, &dibh); 1512 if (error) 1513 goto out_end_trans; 1514 ip->i_inode.i_ctime = CURRENT_TIME; 1515 gfs2_trans_add_meta(ip->i_gl, dibh); 1516 gfs2_dinode_out(ip, dibh->b_data); 1517 brelse(dibh); 1518 } 1519 1520 error = gfs2_dir_del(odip, odentry); 1521 if (error) 1522 goto out_end_trans; 1523 1524 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da); 1525 if (error) 1526 goto out_end_trans; 1527 1528 out_end_trans: 1529 gfs2_trans_end(sdp); 1530 out_ipreserv: 1531 if (da.nr_blocks) 1532 gfs2_inplace_release(ndip); 1533 out_gunlock_q: 1534 if (da.nr_blocks) 1535 gfs2_quota_unlock(ndip); 1536 out_gunlock: 1537 gfs2_dir_no_add(&da); 1538 while (x--) { 1539 gfs2_glock_dq(ghs + x); 1540 gfs2_holder_uninit(ghs + x); 1541 } 1542 out_gunlock_r: 1543 if (r_gh.gh_gl) 1544 gfs2_glock_dq_uninit(&r_gh); 1545 out: 1546 return error; 1547 } 1548 1549 /** 1550 * gfs2_follow_link - Follow a symbolic link 1551 * @dentry: The dentry of the link 1552 * @nd: Data that we pass to vfs_follow_link() 1553 * 1554 * This can handle symlinks of any size. 1555 * 1556 * Returns: 0 on success or error code 1557 */ 1558 1559 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd) 1560 { 1561 struct gfs2_inode *ip = GFS2_I(dentry->d_inode); 1562 struct gfs2_holder i_gh; 1563 struct buffer_head *dibh; 1564 unsigned int size; 1565 char *buf; 1566 int error; 1567 1568 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); 1569 error = gfs2_glock_nq(&i_gh); 1570 if (error) { 1571 gfs2_holder_uninit(&i_gh); 1572 nd_set_link(nd, ERR_PTR(error)); 1573 return NULL; 1574 } 1575 1576 size = (unsigned int)i_size_read(&ip->i_inode); 1577 if (size == 0) { 1578 gfs2_consist_inode(ip); 1579 buf = ERR_PTR(-EIO); 1580 goto out; 1581 } 1582 1583 error = gfs2_meta_inode_buffer(ip, &dibh); 1584 if (error) { 1585 buf = ERR_PTR(error); 1586 goto out; 1587 } 1588 1589 buf = kzalloc(size + 1, GFP_NOFS); 1590 if (!buf) 1591 buf = ERR_PTR(-ENOMEM); 1592 else 1593 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size); 1594 brelse(dibh); 1595 out: 1596 gfs2_glock_dq_uninit(&i_gh); 1597 nd_set_link(nd, buf); 1598 return NULL; 1599 } 1600 1601 /** 1602 * gfs2_permission - 1603 * @inode: The inode 1604 * @mask: The mask to be tested 1605 * @flags: Indicates whether this is an RCU path walk or not 1606 * 1607 * This may be called from the VFS directly, or from within GFS2 with the 1608 * inode locked, so we look to see if the glock is already locked and only 1609 * lock the glock if its not already been done. 1610 * 1611 * Returns: errno 1612 */ 1613 1614 int gfs2_permission(struct inode *inode, int mask) 1615 { 1616 struct gfs2_inode *ip; 1617 struct gfs2_holder i_gh; 1618 struct gfs2_sbd *sdp = GFS2_SB(inode); 1619 int error; 1620 int unlock = 0; 1621 int frozen_root = 0; 1622 1623 1624 ip = GFS2_I(inode); 1625 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 1626 if (unlikely(gfs2_glock_is_held_excl(sdp->sd_freeze_gl) && 1627 inode == sdp->sd_root_dir->d_inode && 1628 atomic_inc_not_zero(&sdp->sd_frozen_root))) 1629 frozen_root = 1; 1630 else { 1631 if (mask & MAY_NOT_BLOCK) 1632 return -ECHILD; 1633 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); 1634 if (error) 1635 return error; 1636 unlock = 1; 1637 } 1638 } 1639 1640 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode)) 1641 error = -EACCES; 1642 else 1643 error = generic_permission(inode, mask); 1644 if (unlock) 1645 gfs2_glock_dq_uninit(&i_gh); 1646 else if (frozen_root && atomic_dec_and_test(&sdp->sd_frozen_root)) 1647 wake_up(&sdp->sd_frozen_root_wait); 1648 1649 return error; 1650 } 1651 1652 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1653 { 1654 setattr_copy(inode, attr); 1655 mark_inode_dirty(inode); 1656 return 0; 1657 } 1658 1659 /** 1660 * gfs2_setattr_simple - 1661 * @ip: 1662 * @attr: 1663 * 1664 * Returns: errno 1665 */ 1666 1667 int gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1668 { 1669 int error; 1670 1671 if (current->journal_info) 1672 return __gfs2_setattr_simple(inode, attr); 1673 1674 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0); 1675 if (error) 1676 return error; 1677 1678 error = __gfs2_setattr_simple(inode, attr); 1679 gfs2_trans_end(GFS2_SB(inode)); 1680 return error; 1681 } 1682 1683 static int setattr_chown(struct inode *inode, struct iattr *attr) 1684 { 1685 struct gfs2_inode *ip = GFS2_I(inode); 1686 struct gfs2_sbd *sdp = GFS2_SB(inode); 1687 kuid_t ouid, nuid; 1688 kgid_t ogid, ngid; 1689 int error; 1690 1691 ouid = inode->i_uid; 1692 ogid = inode->i_gid; 1693 nuid = attr->ia_uid; 1694 ngid = attr->ia_gid; 1695 1696 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid)) 1697 ouid = nuid = NO_UID_QUOTA_CHANGE; 1698 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid)) 1699 ogid = ngid = NO_GID_QUOTA_CHANGE; 1700 1701 error = get_write_access(inode); 1702 if (error) 1703 return error; 1704 1705 error = gfs2_rs_alloc(ip); 1706 if (error) 1707 goto out; 1708 1709 error = gfs2_rindex_update(sdp); 1710 if (error) 1711 goto out; 1712 1713 error = gfs2_quota_lock(ip, nuid, ngid); 1714 if (error) 1715 goto out; 1716 1717 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 1718 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 1719 error = gfs2_quota_check(ip, nuid, ngid); 1720 if (error) 1721 goto out_gunlock_q; 1722 } 1723 1724 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0); 1725 if (error) 1726 goto out_gunlock_q; 1727 1728 error = gfs2_setattr_simple(inode, attr); 1729 if (error) 1730 goto out_end_trans; 1731 1732 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 1733 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 1734 u64 blocks = gfs2_get_inode_blocks(&ip->i_inode); 1735 gfs2_quota_change(ip, -blocks, ouid, ogid); 1736 gfs2_quota_change(ip, blocks, nuid, ngid); 1737 } 1738 1739 out_end_trans: 1740 gfs2_trans_end(sdp); 1741 out_gunlock_q: 1742 gfs2_quota_unlock(ip); 1743 out: 1744 put_write_access(inode); 1745 return error; 1746 } 1747 1748 /** 1749 * gfs2_setattr - Change attributes on an inode 1750 * @dentry: The dentry which is changing 1751 * @attr: The structure describing the change 1752 * 1753 * The VFS layer wants to change one or more of an inodes attributes. Write 1754 * that change out to disk. 1755 * 1756 * Returns: errno 1757 */ 1758 1759 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr) 1760 { 1761 struct inode *inode = dentry->d_inode; 1762 struct gfs2_inode *ip = GFS2_I(inode); 1763 struct gfs2_holder i_gh; 1764 int error; 1765 1766 error = gfs2_rs_alloc(ip); 1767 if (error) 1768 return error; 1769 1770 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); 1771 if (error) 1772 return error; 1773 1774 error = -EPERM; 1775 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 1776 goto out; 1777 1778 error = inode_change_ok(inode, attr); 1779 if (error) 1780 goto out; 1781 1782 if (attr->ia_valid & ATTR_SIZE) 1783 error = gfs2_setattr_size(inode, attr->ia_size); 1784 else if (attr->ia_valid & (ATTR_UID | ATTR_GID)) 1785 error = setattr_chown(inode, attr); 1786 else { 1787 error = gfs2_setattr_simple(inode, attr); 1788 if (!error && attr->ia_valid & ATTR_MODE) 1789 error = posix_acl_chmod(inode, inode->i_mode); 1790 } 1791 1792 out: 1793 if (!error) 1794 mark_inode_dirty(inode); 1795 gfs2_glock_dq_uninit(&i_gh); 1796 return error; 1797 } 1798 1799 /** 1800 * gfs2_getattr - Read out an inode's attributes 1801 * @mnt: The vfsmount the inode is being accessed from 1802 * @dentry: The dentry to stat 1803 * @stat: The inode's stats 1804 * 1805 * This may be called from the VFS directly, or from within GFS2 with the 1806 * inode locked, so we look to see if the glock is already locked and only 1807 * lock the glock if its not already been done. Note that its the NFS 1808 * readdirplus operation which causes this to be called (from filldir) 1809 * with the glock already held. 1810 * 1811 * Returns: errno 1812 */ 1813 1814 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry, 1815 struct kstat *stat) 1816 { 1817 struct inode *inode = dentry->d_inode; 1818 struct gfs2_inode *ip = GFS2_I(inode); 1819 struct gfs2_holder gh; 1820 struct gfs2_sbd *sdp = GFS2_SB(inode); 1821 int error; 1822 int unlock = 0; 1823 int frozen_root = 0; 1824 1825 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 1826 if (unlikely(gfs2_glock_is_held_excl(sdp->sd_freeze_gl) && 1827 inode == sdp->sd_root_dir->d_inode && 1828 atomic_inc_not_zero(&sdp->sd_frozen_root))) 1829 frozen_root = 1; 1830 else { 1831 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 1832 if (error) 1833 return error; 1834 unlock = 1; 1835 } 1836 } 1837 1838 generic_fillattr(inode, stat); 1839 if (unlock) 1840 gfs2_glock_dq_uninit(&gh); 1841 else if (frozen_root && atomic_dec_and_test(&sdp->sd_frozen_root)) 1842 wake_up(&sdp->sd_frozen_root_wait); 1843 1844 return 0; 1845 } 1846 1847 static int gfs2_setxattr(struct dentry *dentry, const char *name, 1848 const void *data, size_t size, int flags) 1849 { 1850 struct inode *inode = dentry->d_inode; 1851 struct gfs2_inode *ip = GFS2_I(inode); 1852 struct gfs2_holder gh; 1853 int ret; 1854 1855 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 1856 ret = gfs2_glock_nq(&gh); 1857 if (ret == 0) { 1858 ret = gfs2_rs_alloc(ip); 1859 if (ret == 0) 1860 ret = generic_setxattr(dentry, name, data, size, flags); 1861 gfs2_glock_dq(&gh); 1862 } 1863 gfs2_holder_uninit(&gh); 1864 return ret; 1865 } 1866 1867 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name, 1868 void *data, size_t size) 1869 { 1870 struct inode *inode = dentry->d_inode; 1871 struct gfs2_inode *ip = GFS2_I(inode); 1872 struct gfs2_holder gh; 1873 int ret; 1874 1875 /* For selinux during lookup */ 1876 if (gfs2_glock_is_locked_by_me(ip->i_gl)) 1877 return generic_getxattr(dentry, name, data, size); 1878 1879 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 1880 ret = gfs2_glock_nq(&gh); 1881 if (ret == 0) { 1882 ret = generic_getxattr(dentry, name, data, size); 1883 gfs2_glock_dq(&gh); 1884 } 1885 gfs2_holder_uninit(&gh); 1886 return ret; 1887 } 1888 1889 static int gfs2_removexattr(struct dentry *dentry, const char *name) 1890 { 1891 struct inode *inode = dentry->d_inode; 1892 struct gfs2_inode *ip = GFS2_I(inode); 1893 struct gfs2_holder gh; 1894 int ret; 1895 1896 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 1897 ret = gfs2_glock_nq(&gh); 1898 if (ret == 0) { 1899 ret = gfs2_rs_alloc(ip); 1900 if (ret == 0) 1901 ret = generic_removexattr(dentry, name); 1902 gfs2_glock_dq(&gh); 1903 } 1904 gfs2_holder_uninit(&gh); 1905 return ret; 1906 } 1907 1908 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 1909 u64 start, u64 len) 1910 { 1911 struct gfs2_inode *ip = GFS2_I(inode); 1912 struct gfs2_holder gh; 1913 int ret; 1914 1915 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC); 1916 if (ret) 1917 return ret; 1918 1919 mutex_lock(&inode->i_mutex); 1920 1921 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 1922 if (ret) 1923 goto out; 1924 1925 if (gfs2_is_stuffed(ip)) { 1926 u64 phys = ip->i_no_addr << inode->i_blkbits; 1927 u64 size = i_size_read(inode); 1928 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED| 1929 FIEMAP_EXTENT_DATA_INLINE; 1930 phys += sizeof(struct gfs2_dinode); 1931 phys += start; 1932 if (start + len > size) 1933 len = size - start; 1934 if (start < size) 1935 ret = fiemap_fill_next_extent(fieinfo, start, phys, 1936 len, flags); 1937 if (ret == 1) 1938 ret = 0; 1939 } else { 1940 ret = __generic_block_fiemap(inode, fieinfo, start, len, 1941 gfs2_block_map); 1942 } 1943 1944 gfs2_glock_dq_uninit(&gh); 1945 out: 1946 mutex_unlock(&inode->i_mutex); 1947 return ret; 1948 } 1949 1950 const struct inode_operations gfs2_file_iops = { 1951 .permission = gfs2_permission, 1952 .setattr = gfs2_setattr, 1953 .getattr = gfs2_getattr, 1954 .setxattr = gfs2_setxattr, 1955 .getxattr = gfs2_getxattr, 1956 .listxattr = gfs2_listxattr, 1957 .removexattr = gfs2_removexattr, 1958 .fiemap = gfs2_fiemap, 1959 .get_acl = gfs2_get_acl, 1960 .set_acl = gfs2_set_acl, 1961 }; 1962 1963 const struct inode_operations gfs2_dir_iops = { 1964 .create = gfs2_create, 1965 .lookup = gfs2_lookup, 1966 .link = gfs2_link, 1967 .unlink = gfs2_unlink, 1968 .symlink = gfs2_symlink, 1969 .mkdir = gfs2_mkdir, 1970 .rmdir = gfs2_unlink, 1971 .mknod = gfs2_mknod, 1972 .rename = gfs2_rename, 1973 .permission = gfs2_permission, 1974 .setattr = gfs2_setattr, 1975 .getattr = gfs2_getattr, 1976 .setxattr = gfs2_setxattr, 1977 .getxattr = gfs2_getxattr, 1978 .listxattr = gfs2_listxattr, 1979 .removexattr = gfs2_removexattr, 1980 .fiemap = gfs2_fiemap, 1981 .get_acl = gfs2_get_acl, 1982 .set_acl = gfs2_set_acl, 1983 .atomic_open = gfs2_atomic_open, 1984 }; 1985 1986 const struct inode_operations gfs2_symlink_iops = { 1987 .readlink = generic_readlink, 1988 .follow_link = gfs2_follow_link, 1989 .put_link = kfree_put_link, 1990 .permission = gfs2_permission, 1991 .setattr = gfs2_setattr, 1992 .getattr = gfs2_getattr, 1993 .setxattr = gfs2_setxattr, 1994 .getxattr = gfs2_getxattr, 1995 .listxattr = gfs2_listxattr, 1996 .removexattr = gfs2_removexattr, 1997 .fiemap = gfs2_fiemap, 1998 }; 1999 2000