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