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 inode = ERR_CAST(d); 631 goto fail_gunlock; 632 } 633 error = 0; 634 if (file) { 635 if (S_ISREG(inode->i_mode)) { 636 WARN_ON(d != NULL); 637 error = finish_open(file, dentry, gfs2_open_common, opened); 638 } else { 639 error = finish_no_open(file, d); 640 } 641 } else { 642 dput(d); 643 } 644 gfs2_glock_dq_uninit(ghs); 645 return error; 646 } else if (error != -ENOENT) { 647 goto fail_gunlock; 648 } 649 650 error = gfs2_diradd_alloc_required(dir, name, &da); 651 if (error < 0) 652 goto fail_gunlock; 653 654 inode = new_inode(sdp->sd_vfs); 655 error = -ENOMEM; 656 if (!inode) 657 goto fail_gunlock; 658 659 error = posix_acl_create(dir, &mode, &default_acl, &acl); 660 if (error) 661 goto fail_free_vfs_inode; 662 663 ip = GFS2_I(inode); 664 error = gfs2_rs_alloc(ip); 665 if (error) 666 goto fail_free_acls; 667 668 inode->i_mode = mode; 669 set_nlink(inode, S_ISDIR(mode) ? 2 : 1); 670 inode->i_rdev = dev; 671 inode->i_size = size; 672 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 673 gfs2_set_inode_blocks(inode, 1); 674 munge_mode_uid_gid(dip, inode); 675 ip->i_goal = dip->i_goal; 676 ip->i_diskflags = 0; 677 ip->i_eattr = 0; 678 ip->i_height = 0; 679 ip->i_depth = 0; 680 ip->i_entries = 0; 681 682 switch(mode & S_IFMT) { 683 case S_IFREG: 684 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) || 685 gfs2_tune_get(sdp, gt_new_files_jdata)) 686 ip->i_diskflags |= GFS2_DIF_JDATA; 687 gfs2_set_aops(inode); 688 break; 689 case S_IFDIR: 690 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA); 691 ip->i_diskflags |= GFS2_DIF_JDATA; 692 ip->i_entries = 2; 693 break; 694 } 695 gfs2_set_inode_flags(inode); 696 697 if ((GFS2_I(sdp->sd_root_dir->d_inode) == dip) || 698 (dip->i_diskflags & GFS2_DIF_TOPDIR)) 699 aflags |= GFS2_AF_ORLOV; 700 701 if (default_acl || acl) 702 blocks++; 703 704 error = alloc_dinode(ip, aflags, &blocks); 705 if (error) 706 goto fail_free_inode; 707 708 gfs2_set_inode_blocks(inode, blocks); 709 710 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); 711 if (error) 712 goto fail_free_inode; 713 714 ip->i_gl->gl_object = ip; 715 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1); 716 if (error) 717 goto fail_free_inode; 718 719 error = gfs2_trans_begin(sdp, blocks, 0); 720 if (error) 721 goto fail_gunlock2; 722 723 if (blocks > 1) { 724 ip->i_eattr = ip->i_no_addr + 1; 725 gfs2_init_xattr(ip); 726 } 727 init_dinode(dip, ip, symname); 728 gfs2_trans_end(sdp); 729 730 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl); 731 if (error) 732 goto fail_gunlock2; 733 734 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); 735 if (error) 736 goto fail_gunlock2; 737 738 ip->i_iopen_gh.gh_gl->gl_object = ip; 739 gfs2_glock_put(io_gl); 740 gfs2_set_iop(inode); 741 insert_inode_hash(inode); 742 743 if (default_acl) { 744 error = gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT); 745 posix_acl_release(default_acl); 746 } 747 if (acl) { 748 if (!error) 749 error = gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS); 750 posix_acl_release(acl); 751 } 752 753 if (error) 754 goto fail_gunlock3; 755 756 error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name, 757 &gfs2_initxattrs, NULL); 758 if (error) 759 goto fail_gunlock3; 760 761 error = link_dinode(dip, name, ip, &da); 762 if (error) 763 goto fail_gunlock3; 764 765 mark_inode_dirty(inode); 766 d_instantiate(dentry, inode); 767 if (file) { 768 *opened |= FILE_CREATED; 769 error = finish_open(file, dentry, gfs2_open_common, opened); 770 } 771 gfs2_glock_dq_uninit(ghs); 772 gfs2_glock_dq_uninit(ghs + 1); 773 return error; 774 775 fail_gunlock3: 776 gfs2_glock_dq_uninit(ghs + 1); 777 if (ip->i_gl) 778 gfs2_glock_put(ip->i_gl); 779 goto fail_gunlock; 780 781 fail_gunlock2: 782 gfs2_glock_dq_uninit(ghs + 1); 783 fail_free_inode: 784 if (ip->i_gl) 785 gfs2_glock_put(ip->i_gl); 786 gfs2_rs_delete(ip, NULL); 787 fail_free_acls: 788 if (default_acl) 789 posix_acl_release(default_acl); 790 if (acl) 791 posix_acl_release(acl); 792 fail_free_vfs_inode: 793 free_vfs_inode = 1; 794 fail_gunlock: 795 gfs2_dir_no_add(&da); 796 gfs2_glock_dq_uninit(ghs); 797 if (inode && !IS_ERR(inode)) { 798 clear_nlink(inode); 799 if (!free_vfs_inode) 800 mark_inode_dirty(inode); 801 set_bit(free_vfs_inode ? GIF_FREE_VFS_INODE : GIF_ALLOC_FAILED, 802 &GFS2_I(inode)->i_flags); 803 iput(inode); 804 } 805 fail: 806 return error; 807 } 808 809 /** 810 * gfs2_create - Create a file 811 * @dir: The directory in which to create the file 812 * @dentry: The dentry of the new file 813 * @mode: The mode of the new file 814 * 815 * Returns: errno 816 */ 817 818 static int gfs2_create(struct inode *dir, struct dentry *dentry, 819 umode_t mode, bool excl) 820 { 821 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl, NULL); 822 } 823 824 /** 825 * __gfs2_lookup - Look up a filename in a directory and return its inode 826 * @dir: The directory inode 827 * @dentry: The dentry of the new inode 828 * @file: File to be opened 829 * @opened: atomic_open flags 830 * 831 * 832 * Returns: errno 833 */ 834 835 static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry, 836 struct file *file, int *opened) 837 { 838 struct inode *inode; 839 struct dentry *d; 840 struct gfs2_holder gh; 841 struct gfs2_glock *gl; 842 int error; 843 844 inode = gfs2_lookupi(dir, &dentry->d_name, 0); 845 if (inode == NULL) { 846 d_add(dentry, NULL); 847 return NULL; 848 } 849 if (IS_ERR(inode)) 850 return ERR_CAST(inode); 851 852 gl = GFS2_I(inode)->i_gl; 853 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 854 if (error) { 855 iput(inode); 856 return ERR_PTR(error); 857 } 858 859 d = d_splice_alias(inode, dentry); 860 if (IS_ERR(d)) { 861 gfs2_glock_dq_uninit(&gh); 862 return d; 863 } 864 if (file && S_ISREG(inode->i_mode)) 865 error = finish_open(file, dentry, gfs2_open_common, opened); 866 867 gfs2_glock_dq_uninit(&gh); 868 if (error) { 869 dput(d); 870 return ERR_PTR(error); 871 } 872 return d; 873 } 874 875 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry, 876 unsigned flags) 877 { 878 return __gfs2_lookup(dir, dentry, NULL, NULL); 879 } 880 881 /** 882 * gfs2_link - Link to a file 883 * @old_dentry: The inode to link 884 * @dir: Add link to this directory 885 * @dentry: The name of the link 886 * 887 * Link the inode in "old_dentry" into the directory "dir" with the 888 * name in "dentry". 889 * 890 * Returns: errno 891 */ 892 893 static int gfs2_link(struct dentry *old_dentry, struct inode *dir, 894 struct dentry *dentry) 895 { 896 struct gfs2_inode *dip = GFS2_I(dir); 897 struct gfs2_sbd *sdp = GFS2_SB(dir); 898 struct inode *inode = old_dentry->d_inode; 899 struct gfs2_inode *ip = GFS2_I(inode); 900 struct gfs2_holder ghs[2]; 901 struct buffer_head *dibh; 902 struct gfs2_diradd da = { .bh = NULL, }; 903 int error; 904 905 if (S_ISDIR(inode->i_mode)) 906 return -EPERM; 907 908 error = gfs2_rs_alloc(dip); 909 if (error) 910 return error; 911 912 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 913 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); 914 915 error = gfs2_glock_nq(ghs); /* parent */ 916 if (error) 917 goto out_parent; 918 919 error = gfs2_glock_nq(ghs + 1); /* child */ 920 if (error) 921 goto out_child; 922 923 error = -ENOENT; 924 if (inode->i_nlink == 0) 925 goto out_gunlock; 926 927 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC); 928 if (error) 929 goto out_gunlock; 930 931 error = gfs2_dir_check(dir, &dentry->d_name, NULL); 932 switch (error) { 933 case -ENOENT: 934 break; 935 case 0: 936 error = -EEXIST; 937 default: 938 goto out_gunlock; 939 } 940 941 error = -EINVAL; 942 if (!dip->i_inode.i_nlink) 943 goto out_gunlock; 944 error = -EFBIG; 945 if (dip->i_entries == (u32)-1) 946 goto out_gunlock; 947 error = -EPERM; 948 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 949 goto out_gunlock; 950 error = -EINVAL; 951 if (!ip->i_inode.i_nlink) 952 goto out_gunlock; 953 error = -EMLINK; 954 if (ip->i_inode.i_nlink == (u32)-1) 955 goto out_gunlock; 956 957 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da); 958 if (error < 0) 959 goto out_gunlock; 960 961 if (da.nr_blocks) { 962 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, }; 963 error = gfs2_quota_lock_check(dip); 964 if (error) 965 goto out_gunlock; 966 967 error = gfs2_inplace_reserve(dip, &ap); 968 if (error) 969 goto out_gunlock_q; 970 971 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0); 972 if (error) 973 goto out_ipres; 974 } else { 975 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0); 976 if (error) 977 goto out_ipres; 978 } 979 980 error = gfs2_meta_inode_buffer(ip, &dibh); 981 if (error) 982 goto out_end_trans; 983 984 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da); 985 if (error) 986 goto out_brelse; 987 988 gfs2_trans_add_meta(ip->i_gl, dibh); 989 inc_nlink(&ip->i_inode); 990 ip->i_inode.i_ctime = CURRENT_TIME; 991 ihold(inode); 992 d_instantiate(dentry, inode); 993 mark_inode_dirty(inode); 994 995 out_brelse: 996 brelse(dibh); 997 out_end_trans: 998 gfs2_trans_end(sdp); 999 out_ipres: 1000 if (da.nr_blocks) 1001 gfs2_inplace_release(dip); 1002 out_gunlock_q: 1003 if (da.nr_blocks) 1004 gfs2_quota_unlock(dip); 1005 out_gunlock: 1006 gfs2_dir_no_add(&da); 1007 gfs2_glock_dq(ghs + 1); 1008 out_child: 1009 gfs2_glock_dq(ghs); 1010 out_parent: 1011 gfs2_holder_uninit(ghs); 1012 gfs2_holder_uninit(ghs + 1); 1013 return error; 1014 } 1015 1016 /* 1017 * gfs2_unlink_ok - check to see that a inode is still in a directory 1018 * @dip: the directory 1019 * @name: the name of the file 1020 * @ip: the inode 1021 * 1022 * Assumes that the lock on (at least) @dip is held. 1023 * 1024 * Returns: 0 if the parent/child relationship is correct, errno if it isn't 1025 */ 1026 1027 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, 1028 const struct gfs2_inode *ip) 1029 { 1030 int error; 1031 1032 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) 1033 return -EPERM; 1034 1035 if ((dip->i_inode.i_mode & S_ISVTX) && 1036 !uid_eq(dip->i_inode.i_uid, current_fsuid()) && 1037 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER)) 1038 return -EPERM; 1039 1040 if (IS_APPEND(&dip->i_inode)) 1041 return -EPERM; 1042 1043 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC); 1044 if (error) 1045 return error; 1046 1047 error = gfs2_dir_check(&dip->i_inode, name, ip); 1048 if (error) 1049 return error; 1050 1051 return 0; 1052 } 1053 1054 /** 1055 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it 1056 * @dip: The parent directory 1057 * @name: The name of the entry in the parent directory 1058 * @inode: The inode to be removed 1059 * 1060 * Called with all the locks and in a transaction. This will only be 1061 * called for a directory after it has been checked to ensure it is empty. 1062 * 1063 * Returns: 0 on success, or an error 1064 */ 1065 1066 static int gfs2_unlink_inode(struct gfs2_inode *dip, 1067 const struct dentry *dentry) 1068 { 1069 struct inode *inode = dentry->d_inode; 1070 struct gfs2_inode *ip = GFS2_I(inode); 1071 int error; 1072 1073 error = gfs2_dir_del(dip, dentry); 1074 if (error) 1075 return error; 1076 1077 ip->i_entries = 0; 1078 inode->i_ctime = CURRENT_TIME; 1079 if (S_ISDIR(inode->i_mode)) 1080 clear_nlink(inode); 1081 else 1082 drop_nlink(inode); 1083 mark_inode_dirty(inode); 1084 if (inode->i_nlink == 0) 1085 gfs2_unlink_di(inode); 1086 return 0; 1087 } 1088 1089 1090 /** 1091 * gfs2_unlink - Unlink an inode (this does rmdir as well) 1092 * @dir: The inode of the directory containing the inode to unlink 1093 * @dentry: The file itself 1094 * 1095 * This routine uses the type of the inode as a flag to figure out 1096 * whether this is an unlink or an rmdir. 1097 * 1098 * Returns: errno 1099 */ 1100 1101 static int gfs2_unlink(struct inode *dir, struct dentry *dentry) 1102 { 1103 struct gfs2_inode *dip = GFS2_I(dir); 1104 struct gfs2_sbd *sdp = GFS2_SB(dir); 1105 struct inode *inode = dentry->d_inode; 1106 struct gfs2_inode *ip = GFS2_I(inode); 1107 struct gfs2_holder ghs[3]; 1108 struct gfs2_rgrpd *rgd; 1109 int error; 1110 1111 error = gfs2_rindex_update(sdp); 1112 if (error) 1113 return error; 1114 1115 error = -EROFS; 1116 1117 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 1118 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); 1119 1120 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1); 1121 if (!rgd) 1122 goto out_inodes; 1123 1124 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2); 1125 1126 1127 error = gfs2_glock_nq(ghs); /* parent */ 1128 if (error) 1129 goto out_parent; 1130 1131 error = gfs2_glock_nq(ghs + 1); /* child */ 1132 if (error) 1133 goto out_child; 1134 1135 error = -ENOENT; 1136 if (inode->i_nlink == 0) 1137 goto out_rgrp; 1138 1139 if (S_ISDIR(inode->i_mode)) { 1140 error = -ENOTEMPTY; 1141 if (ip->i_entries > 2 || inode->i_nlink > 2) 1142 goto out_rgrp; 1143 } 1144 1145 error = gfs2_glock_nq(ghs + 2); /* rgrp */ 1146 if (error) 1147 goto out_rgrp; 1148 1149 error = gfs2_unlink_ok(dip, &dentry->d_name, ip); 1150 if (error) 1151 goto out_gunlock; 1152 1153 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0); 1154 if (error) 1155 goto out_end_trans; 1156 1157 error = gfs2_unlink_inode(dip, dentry); 1158 1159 out_end_trans: 1160 gfs2_trans_end(sdp); 1161 out_gunlock: 1162 gfs2_glock_dq(ghs + 2); 1163 out_rgrp: 1164 gfs2_glock_dq(ghs + 1); 1165 out_child: 1166 gfs2_glock_dq(ghs); 1167 out_parent: 1168 gfs2_holder_uninit(ghs + 2); 1169 out_inodes: 1170 gfs2_holder_uninit(ghs + 1); 1171 gfs2_holder_uninit(ghs); 1172 return error; 1173 } 1174 1175 /** 1176 * gfs2_symlink - Create a symlink 1177 * @dir: The directory to create the symlink in 1178 * @dentry: The dentry to put the symlink in 1179 * @symname: The thing which the link points to 1180 * 1181 * Returns: errno 1182 */ 1183 1184 static int gfs2_symlink(struct inode *dir, struct dentry *dentry, 1185 const char *symname) 1186 { 1187 struct gfs2_sbd *sdp = GFS2_SB(dir); 1188 unsigned int size; 1189 1190 size = strlen(symname); 1191 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1) 1192 return -ENAMETOOLONG; 1193 1194 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0, NULL); 1195 } 1196 1197 /** 1198 * gfs2_mkdir - Make a directory 1199 * @dir: The parent directory of the new one 1200 * @dentry: The dentry of the new directory 1201 * @mode: The mode of the new directory 1202 * 1203 * Returns: errno 1204 */ 1205 1206 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 1207 { 1208 struct gfs2_sbd *sdp = GFS2_SB(dir); 1209 unsigned dsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode); 1210 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0, NULL); 1211 } 1212 1213 /** 1214 * gfs2_mknod - Make a special file 1215 * @dir: The directory in which the special file will reside 1216 * @dentry: The dentry of the special file 1217 * @mode: The mode of the special file 1218 * @dev: The device specification of the special file 1219 * 1220 */ 1221 1222 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, 1223 dev_t dev) 1224 { 1225 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0, NULL); 1226 } 1227 1228 /** 1229 * gfs2_atomic_open - Atomically open a file 1230 * @dir: The directory 1231 * @dentry: The proposed new entry 1232 * @file: The proposed new struct file 1233 * @flags: open flags 1234 * @mode: File mode 1235 * @opened: Flag to say whether the file has been opened or not 1236 * 1237 * Returns: error code or 0 for success 1238 */ 1239 1240 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry, 1241 struct file *file, unsigned flags, 1242 umode_t mode, int *opened) 1243 { 1244 struct dentry *d; 1245 bool excl = !!(flags & O_EXCL); 1246 1247 d = __gfs2_lookup(dir, dentry, file, opened); 1248 if (IS_ERR(d)) 1249 return PTR_ERR(d); 1250 if (d != NULL) 1251 dentry = d; 1252 if (dentry->d_inode) { 1253 if (!(*opened & FILE_OPENED)) { 1254 if (d == NULL) 1255 dget(dentry); 1256 return finish_no_open(file, dentry); 1257 } 1258 dput(d); 1259 return 0; 1260 } 1261 1262 BUG_ON(d != NULL); 1263 if (!(flags & O_CREAT)) 1264 return -ENOENT; 1265 1266 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl, opened); 1267 } 1268 1269 /* 1270 * gfs2_ok_to_move - check if it's ok to move a directory to another directory 1271 * @this: move this 1272 * @to: to here 1273 * 1274 * Follow @to back to the root and make sure we don't encounter @this 1275 * Assumes we already hold the rename lock. 1276 * 1277 * Returns: errno 1278 */ 1279 1280 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) 1281 { 1282 struct inode *dir = &to->i_inode; 1283 struct super_block *sb = dir->i_sb; 1284 struct inode *tmp; 1285 int error = 0; 1286 1287 igrab(dir); 1288 1289 for (;;) { 1290 if (dir == &this->i_inode) { 1291 error = -EINVAL; 1292 break; 1293 } 1294 if (dir == sb->s_root->d_inode) { 1295 error = 0; 1296 break; 1297 } 1298 1299 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1); 1300 if (!tmp) { 1301 error = -ENOENT; 1302 break; 1303 } 1304 if (IS_ERR(tmp)) { 1305 error = PTR_ERR(tmp); 1306 break; 1307 } 1308 1309 iput(dir); 1310 dir = tmp; 1311 } 1312 1313 iput(dir); 1314 1315 return error; 1316 } 1317 1318 /** 1319 * gfs2_rename - Rename a file 1320 * @odir: Parent directory of old file name 1321 * @odentry: The old dentry of the file 1322 * @ndir: Parent directory of new file name 1323 * @ndentry: The new dentry of the file 1324 * 1325 * Returns: errno 1326 */ 1327 1328 static int gfs2_rename(struct inode *odir, struct dentry *odentry, 1329 struct inode *ndir, struct dentry *ndentry) 1330 { 1331 struct gfs2_inode *odip = GFS2_I(odir); 1332 struct gfs2_inode *ndip = GFS2_I(ndir); 1333 struct gfs2_inode *ip = GFS2_I(odentry->d_inode); 1334 struct gfs2_inode *nip = NULL; 1335 struct gfs2_sbd *sdp = GFS2_SB(odir); 1336 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, }; 1337 struct gfs2_rgrpd *nrgd; 1338 unsigned int num_gh; 1339 int dir_rename = 0; 1340 struct gfs2_diradd da = { .nr_blocks = 0, }; 1341 unsigned int x; 1342 int error; 1343 1344 if (ndentry->d_inode) { 1345 nip = GFS2_I(ndentry->d_inode); 1346 if (ip == nip) 1347 return 0; 1348 } 1349 1350 error = gfs2_rindex_update(sdp); 1351 if (error) 1352 return error; 1353 1354 error = gfs2_rs_alloc(ndip); 1355 if (error) 1356 return error; 1357 1358 if (odip != ndip) { 1359 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 1360 0, &r_gh); 1361 if (error) 1362 goto out; 1363 1364 if (S_ISDIR(ip->i_inode.i_mode)) { 1365 dir_rename = 1; 1366 /* don't move a dirctory into it's subdir */ 1367 error = gfs2_ok_to_move(ip, ndip); 1368 if (error) 1369 goto out_gunlock_r; 1370 } 1371 } 1372 1373 num_gh = 1; 1374 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 1375 if (odip != ndip) { 1376 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1377 num_gh++; 1378 } 1379 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1380 num_gh++; 1381 1382 if (nip) { 1383 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1384 num_gh++; 1385 /* grab the resource lock for unlink flag twiddling 1386 * this is the case of the target file already existing 1387 * so we unlink before doing the rename 1388 */ 1389 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1); 1390 if (nrgd) 1391 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++); 1392 } 1393 1394 for (x = 0; x < num_gh; x++) { 1395 error = gfs2_glock_nq(ghs + x); 1396 if (error) 1397 goto out_gunlock; 1398 } 1399 1400 error = -ENOENT; 1401 if (ip->i_inode.i_nlink == 0) 1402 goto out_gunlock; 1403 1404 /* Check out the old directory */ 1405 1406 error = gfs2_unlink_ok(odip, &odentry->d_name, ip); 1407 if (error) 1408 goto out_gunlock; 1409 1410 /* Check out the new directory */ 1411 1412 if (nip) { 1413 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); 1414 if (error) 1415 goto out_gunlock; 1416 1417 if (nip->i_inode.i_nlink == 0) { 1418 error = -EAGAIN; 1419 goto out_gunlock; 1420 } 1421 1422 if (S_ISDIR(nip->i_inode.i_mode)) { 1423 if (nip->i_entries < 2) { 1424 gfs2_consist_inode(nip); 1425 error = -EIO; 1426 goto out_gunlock; 1427 } 1428 if (nip->i_entries > 2) { 1429 error = -ENOTEMPTY; 1430 goto out_gunlock; 1431 } 1432 } 1433 } else { 1434 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC); 1435 if (error) 1436 goto out_gunlock; 1437 1438 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL); 1439 switch (error) { 1440 case -ENOENT: 1441 error = 0; 1442 break; 1443 case 0: 1444 error = -EEXIST; 1445 default: 1446 goto out_gunlock; 1447 }; 1448 1449 if (odip != ndip) { 1450 if (!ndip->i_inode.i_nlink) { 1451 error = -ENOENT; 1452 goto out_gunlock; 1453 } 1454 if (ndip->i_entries == (u32)-1) { 1455 error = -EFBIG; 1456 goto out_gunlock; 1457 } 1458 if (S_ISDIR(ip->i_inode.i_mode) && 1459 ndip->i_inode.i_nlink == (u32)-1) { 1460 error = -EMLINK; 1461 goto out_gunlock; 1462 } 1463 } 1464 } 1465 1466 /* Check out the dir to be renamed */ 1467 1468 if (dir_rename) { 1469 error = gfs2_permission(odentry->d_inode, MAY_WRITE); 1470 if (error) 1471 goto out_gunlock; 1472 } 1473 1474 if (nip == NULL) { 1475 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da); 1476 if (error) 1477 goto out_gunlock; 1478 } 1479 1480 if (da.nr_blocks) { 1481 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, }; 1482 error = gfs2_quota_lock_check(ndip); 1483 if (error) 1484 goto out_gunlock; 1485 1486 error = gfs2_inplace_reserve(ndip, &ap); 1487 if (error) 1488 goto out_gunlock_q; 1489 1490 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) + 1491 4 * RES_LEAF + 4, 0); 1492 if (error) 1493 goto out_ipreserv; 1494 } else { 1495 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 1496 5 * RES_LEAF + 4, 0); 1497 if (error) 1498 goto out_gunlock; 1499 } 1500 1501 /* Remove the target file, if it exists */ 1502 1503 if (nip) 1504 error = gfs2_unlink_inode(ndip, ndentry); 1505 1506 if (dir_rename) { 1507 error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR); 1508 if (error) 1509 goto out_end_trans; 1510 } else { 1511 struct buffer_head *dibh; 1512 error = gfs2_meta_inode_buffer(ip, &dibh); 1513 if (error) 1514 goto out_end_trans; 1515 ip->i_inode.i_ctime = CURRENT_TIME; 1516 gfs2_trans_add_meta(ip->i_gl, dibh); 1517 gfs2_dinode_out(ip, dibh->b_data); 1518 brelse(dibh); 1519 } 1520 1521 error = gfs2_dir_del(odip, odentry); 1522 if (error) 1523 goto out_end_trans; 1524 1525 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da); 1526 if (error) 1527 goto out_end_trans; 1528 1529 out_end_trans: 1530 gfs2_trans_end(sdp); 1531 out_ipreserv: 1532 if (da.nr_blocks) 1533 gfs2_inplace_release(ndip); 1534 out_gunlock_q: 1535 if (da.nr_blocks) 1536 gfs2_quota_unlock(ndip); 1537 out_gunlock: 1538 gfs2_dir_no_add(&da); 1539 while (x--) { 1540 gfs2_glock_dq(ghs + x); 1541 gfs2_holder_uninit(ghs + x); 1542 } 1543 out_gunlock_r: 1544 if (r_gh.gh_gl) 1545 gfs2_glock_dq_uninit(&r_gh); 1546 out: 1547 return error; 1548 } 1549 1550 /** 1551 * gfs2_follow_link - Follow a symbolic link 1552 * @dentry: The dentry of the link 1553 * @nd: Data that we pass to vfs_follow_link() 1554 * 1555 * This can handle symlinks of any size. 1556 * 1557 * Returns: 0 on success or error code 1558 */ 1559 1560 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd) 1561 { 1562 struct gfs2_inode *ip = GFS2_I(dentry->d_inode); 1563 struct gfs2_holder i_gh; 1564 struct buffer_head *dibh; 1565 unsigned int size; 1566 char *buf; 1567 int error; 1568 1569 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); 1570 error = gfs2_glock_nq(&i_gh); 1571 if (error) { 1572 gfs2_holder_uninit(&i_gh); 1573 nd_set_link(nd, ERR_PTR(error)); 1574 return NULL; 1575 } 1576 1577 size = (unsigned int)i_size_read(&ip->i_inode); 1578 if (size == 0) { 1579 gfs2_consist_inode(ip); 1580 buf = ERR_PTR(-EIO); 1581 goto out; 1582 } 1583 1584 error = gfs2_meta_inode_buffer(ip, &dibh); 1585 if (error) { 1586 buf = ERR_PTR(error); 1587 goto out; 1588 } 1589 1590 buf = kzalloc(size + 1, GFP_NOFS); 1591 if (!buf) 1592 buf = ERR_PTR(-ENOMEM); 1593 else 1594 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size); 1595 brelse(dibh); 1596 out: 1597 gfs2_glock_dq_uninit(&i_gh); 1598 nd_set_link(nd, buf); 1599 return NULL; 1600 } 1601 1602 /** 1603 * gfs2_permission - 1604 * @inode: The inode 1605 * @mask: The mask to be tested 1606 * @flags: Indicates whether this is an RCU path walk or not 1607 * 1608 * This may be called from the VFS directly, or from within GFS2 with the 1609 * inode locked, so we look to see if the glock is already locked and only 1610 * lock the glock if its not already been done. 1611 * 1612 * Returns: errno 1613 */ 1614 1615 int gfs2_permission(struct inode *inode, int mask) 1616 { 1617 struct gfs2_inode *ip; 1618 struct gfs2_holder i_gh; 1619 struct gfs2_sbd *sdp = GFS2_SB(inode); 1620 int error; 1621 int unlock = 0; 1622 int frozen_root = 0; 1623 1624 1625 ip = GFS2_I(inode); 1626 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 1627 if (unlikely(gfs2_glock_is_held_excl(sdp->sd_freeze_gl) && 1628 inode == sdp->sd_root_dir->d_inode && 1629 atomic_inc_not_zero(&sdp->sd_frozen_root))) 1630 frozen_root = 1; 1631 else { 1632 if (mask & MAY_NOT_BLOCK) 1633 return -ECHILD; 1634 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); 1635 if (error) 1636 return error; 1637 unlock = 1; 1638 } 1639 } 1640 1641 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode)) 1642 error = -EACCES; 1643 else 1644 error = generic_permission(inode, mask); 1645 if (unlock) 1646 gfs2_glock_dq_uninit(&i_gh); 1647 else if (frozen_root && atomic_dec_and_test(&sdp->sd_frozen_root)) 1648 wake_up(&sdp->sd_frozen_root_wait); 1649 1650 return error; 1651 } 1652 1653 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1654 { 1655 setattr_copy(inode, attr); 1656 mark_inode_dirty(inode); 1657 return 0; 1658 } 1659 1660 /** 1661 * gfs2_setattr_simple - 1662 * @ip: 1663 * @attr: 1664 * 1665 * Returns: errno 1666 */ 1667 1668 int gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1669 { 1670 int error; 1671 1672 if (current->journal_info) 1673 return __gfs2_setattr_simple(inode, attr); 1674 1675 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0); 1676 if (error) 1677 return error; 1678 1679 error = __gfs2_setattr_simple(inode, attr); 1680 gfs2_trans_end(GFS2_SB(inode)); 1681 return error; 1682 } 1683 1684 static int setattr_chown(struct inode *inode, struct iattr *attr) 1685 { 1686 struct gfs2_inode *ip = GFS2_I(inode); 1687 struct gfs2_sbd *sdp = GFS2_SB(inode); 1688 kuid_t ouid, nuid; 1689 kgid_t ogid, ngid; 1690 int error; 1691 1692 ouid = inode->i_uid; 1693 ogid = inode->i_gid; 1694 nuid = attr->ia_uid; 1695 ngid = attr->ia_gid; 1696 1697 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid)) 1698 ouid = nuid = NO_UID_QUOTA_CHANGE; 1699 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid)) 1700 ogid = ngid = NO_GID_QUOTA_CHANGE; 1701 1702 error = get_write_access(inode); 1703 if (error) 1704 return error; 1705 1706 error = gfs2_rs_alloc(ip); 1707 if (error) 1708 goto out; 1709 1710 error = gfs2_rindex_update(sdp); 1711 if (error) 1712 goto out; 1713 1714 error = gfs2_quota_lock(ip, nuid, ngid); 1715 if (error) 1716 goto out; 1717 1718 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 1719 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 1720 error = gfs2_quota_check(ip, nuid, ngid); 1721 if (error) 1722 goto out_gunlock_q; 1723 } 1724 1725 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0); 1726 if (error) 1727 goto out_gunlock_q; 1728 1729 error = gfs2_setattr_simple(inode, attr); 1730 if (error) 1731 goto out_end_trans; 1732 1733 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 1734 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 1735 u64 blocks = gfs2_get_inode_blocks(&ip->i_inode); 1736 gfs2_quota_change(ip, -blocks, ouid, ogid); 1737 gfs2_quota_change(ip, blocks, nuid, ngid); 1738 } 1739 1740 out_end_trans: 1741 gfs2_trans_end(sdp); 1742 out_gunlock_q: 1743 gfs2_quota_unlock(ip); 1744 out: 1745 put_write_access(inode); 1746 return error; 1747 } 1748 1749 /** 1750 * gfs2_setattr - Change attributes on an inode 1751 * @dentry: The dentry which is changing 1752 * @attr: The structure describing the change 1753 * 1754 * The VFS layer wants to change one or more of an inodes attributes. Write 1755 * that change out to disk. 1756 * 1757 * Returns: errno 1758 */ 1759 1760 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr) 1761 { 1762 struct inode *inode = dentry->d_inode; 1763 struct gfs2_inode *ip = GFS2_I(inode); 1764 struct gfs2_holder i_gh; 1765 int error; 1766 1767 error = gfs2_rs_alloc(ip); 1768 if (error) 1769 return error; 1770 1771 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); 1772 if (error) 1773 return error; 1774 1775 error = -EPERM; 1776 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 1777 goto out; 1778 1779 error = inode_change_ok(inode, attr); 1780 if (error) 1781 goto out; 1782 1783 if (attr->ia_valid & ATTR_SIZE) 1784 error = gfs2_setattr_size(inode, attr->ia_size); 1785 else if (attr->ia_valid & (ATTR_UID | ATTR_GID)) 1786 error = setattr_chown(inode, attr); 1787 else { 1788 error = gfs2_setattr_simple(inode, attr); 1789 if (!error && attr->ia_valid & ATTR_MODE) 1790 error = posix_acl_chmod(inode, inode->i_mode); 1791 } 1792 1793 out: 1794 if (!error) 1795 mark_inode_dirty(inode); 1796 gfs2_glock_dq_uninit(&i_gh); 1797 return error; 1798 } 1799 1800 /** 1801 * gfs2_getattr - Read out an inode's attributes 1802 * @mnt: The vfsmount the inode is being accessed from 1803 * @dentry: The dentry to stat 1804 * @stat: The inode's stats 1805 * 1806 * This may be called from the VFS directly, or from within GFS2 with the 1807 * inode locked, so we look to see if the glock is already locked and only 1808 * lock the glock if its not already been done. Note that its the NFS 1809 * readdirplus operation which causes this to be called (from filldir) 1810 * with the glock already held. 1811 * 1812 * Returns: errno 1813 */ 1814 1815 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry, 1816 struct kstat *stat) 1817 { 1818 struct inode *inode = dentry->d_inode; 1819 struct gfs2_inode *ip = GFS2_I(inode); 1820 struct gfs2_holder gh; 1821 struct gfs2_sbd *sdp = GFS2_SB(inode); 1822 int error; 1823 int unlock = 0; 1824 int frozen_root = 0; 1825 1826 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 1827 if (unlikely(gfs2_glock_is_held_excl(sdp->sd_freeze_gl) && 1828 inode == sdp->sd_root_dir->d_inode && 1829 atomic_inc_not_zero(&sdp->sd_frozen_root))) 1830 frozen_root = 1; 1831 else { 1832 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 1833 if (error) 1834 return error; 1835 unlock = 1; 1836 } 1837 } 1838 1839 generic_fillattr(inode, stat); 1840 if (unlock) 1841 gfs2_glock_dq_uninit(&gh); 1842 else if (frozen_root && atomic_dec_and_test(&sdp->sd_frozen_root)) 1843 wake_up(&sdp->sd_frozen_root_wait); 1844 1845 return 0; 1846 } 1847 1848 static int gfs2_setxattr(struct dentry *dentry, const char *name, 1849 const void *data, size_t size, int flags) 1850 { 1851 struct inode *inode = dentry->d_inode; 1852 struct gfs2_inode *ip = GFS2_I(inode); 1853 struct gfs2_holder gh; 1854 int ret; 1855 1856 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 1857 ret = gfs2_glock_nq(&gh); 1858 if (ret == 0) { 1859 ret = gfs2_rs_alloc(ip); 1860 if (ret == 0) 1861 ret = generic_setxattr(dentry, name, data, size, flags); 1862 gfs2_glock_dq(&gh); 1863 } 1864 gfs2_holder_uninit(&gh); 1865 return ret; 1866 } 1867 1868 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name, 1869 void *data, size_t size) 1870 { 1871 struct inode *inode = dentry->d_inode; 1872 struct gfs2_inode *ip = GFS2_I(inode); 1873 struct gfs2_holder gh; 1874 int ret; 1875 1876 /* For selinux during lookup */ 1877 if (gfs2_glock_is_locked_by_me(ip->i_gl)) 1878 return generic_getxattr(dentry, name, data, size); 1879 1880 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 1881 ret = gfs2_glock_nq(&gh); 1882 if (ret == 0) { 1883 ret = generic_getxattr(dentry, name, data, size); 1884 gfs2_glock_dq(&gh); 1885 } 1886 gfs2_holder_uninit(&gh); 1887 return ret; 1888 } 1889 1890 static int gfs2_removexattr(struct dentry *dentry, const char *name) 1891 { 1892 struct inode *inode = dentry->d_inode; 1893 struct gfs2_inode *ip = GFS2_I(inode); 1894 struct gfs2_holder gh; 1895 int ret; 1896 1897 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 1898 ret = gfs2_glock_nq(&gh); 1899 if (ret == 0) { 1900 ret = gfs2_rs_alloc(ip); 1901 if (ret == 0) 1902 ret = generic_removexattr(dentry, name); 1903 gfs2_glock_dq(&gh); 1904 } 1905 gfs2_holder_uninit(&gh); 1906 return ret; 1907 } 1908 1909 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 1910 u64 start, u64 len) 1911 { 1912 struct gfs2_inode *ip = GFS2_I(inode); 1913 struct gfs2_holder gh; 1914 int ret; 1915 1916 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC); 1917 if (ret) 1918 return ret; 1919 1920 mutex_lock(&inode->i_mutex); 1921 1922 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 1923 if (ret) 1924 goto out; 1925 1926 if (gfs2_is_stuffed(ip)) { 1927 u64 phys = ip->i_no_addr << inode->i_blkbits; 1928 u64 size = i_size_read(inode); 1929 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED| 1930 FIEMAP_EXTENT_DATA_INLINE; 1931 phys += sizeof(struct gfs2_dinode); 1932 phys += start; 1933 if (start + len > size) 1934 len = size - start; 1935 if (start < size) 1936 ret = fiemap_fill_next_extent(fieinfo, start, phys, 1937 len, flags); 1938 if (ret == 1) 1939 ret = 0; 1940 } else { 1941 ret = __generic_block_fiemap(inode, fieinfo, start, len, 1942 gfs2_block_map); 1943 } 1944 1945 gfs2_glock_dq_uninit(&gh); 1946 out: 1947 mutex_unlock(&inode->i_mutex); 1948 return ret; 1949 } 1950 1951 const struct inode_operations gfs2_file_iops = { 1952 .permission = gfs2_permission, 1953 .setattr = gfs2_setattr, 1954 .getattr = gfs2_getattr, 1955 .setxattr = gfs2_setxattr, 1956 .getxattr = gfs2_getxattr, 1957 .listxattr = gfs2_listxattr, 1958 .removexattr = gfs2_removexattr, 1959 .fiemap = gfs2_fiemap, 1960 .get_acl = gfs2_get_acl, 1961 .set_acl = gfs2_set_acl, 1962 }; 1963 1964 const struct inode_operations gfs2_dir_iops = { 1965 .create = gfs2_create, 1966 .lookup = gfs2_lookup, 1967 .link = gfs2_link, 1968 .unlink = gfs2_unlink, 1969 .symlink = gfs2_symlink, 1970 .mkdir = gfs2_mkdir, 1971 .rmdir = gfs2_unlink, 1972 .mknod = gfs2_mknod, 1973 .rename = gfs2_rename, 1974 .permission = gfs2_permission, 1975 .setattr = gfs2_setattr, 1976 .getattr = gfs2_getattr, 1977 .setxattr = gfs2_setxattr, 1978 .getxattr = gfs2_getxattr, 1979 .listxattr = gfs2_listxattr, 1980 .removexattr = gfs2_removexattr, 1981 .fiemap = gfs2_fiemap, 1982 .get_acl = gfs2_get_acl, 1983 .set_acl = gfs2_set_acl, 1984 .atomic_open = gfs2_atomic_open, 1985 }; 1986 1987 const struct inode_operations gfs2_symlink_iops = { 1988 .readlink = generic_readlink, 1989 .follow_link = gfs2_follow_link, 1990 .put_link = kfree_put_link, 1991 .permission = gfs2_permission, 1992 .setattr = gfs2_setattr, 1993 .getattr = gfs2_getattr, 1994 .setxattr = gfs2_setxattr, 1995 .getxattr = gfs2_getxattr, 1996 .listxattr = gfs2_listxattr, 1997 .removexattr = gfs2_removexattr, 1998 .fiemap = gfs2_fiemap, 1999 }; 2000 2001