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(-ENOBUFS); 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) 380 { 381 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 382 struct gfs2_alloc_parms ap = { .target = RES_DINODE, .aflags = flags, }; 383 int error; 384 int dblocks = 1; 385 386 error = gfs2_quota_lock_check(ip); 387 if (error) 388 goto out; 389 390 error = gfs2_inplace_reserve(ip, &ap); 391 if (error) 392 goto out_quota; 393 394 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 0); 395 if (error) 396 goto out_ipreserv; 397 398 error = gfs2_alloc_blocks(ip, &ip->i_no_addr, &dblocks, 1, &ip->i_generation); 399 ip->i_no_formal_ino = ip->i_generation; 400 ip->i_inode.i_ino = ip->i_no_addr; 401 ip->i_goal = ip->i_no_addr; 402 403 gfs2_trans_end(sdp); 404 405 out_ipreserv: 406 gfs2_inplace_release(ip); 407 out_quota: 408 gfs2_quota_unlock(ip); 409 out: 410 return error; 411 } 412 413 static void gfs2_init_dir(struct buffer_head *dibh, 414 const struct gfs2_inode *parent) 415 { 416 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data; 417 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1); 418 419 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent); 420 dent->de_inum = di->di_num; /* already GFS2 endian */ 421 dent->de_type = cpu_to_be16(DT_DIR); 422 423 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1)); 424 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent); 425 gfs2_inum_out(parent, dent); 426 dent->de_type = cpu_to_be16(DT_DIR); 427 428 } 429 430 /** 431 * init_dinode - Fill in a new dinode structure 432 * @dip: The directory this inode is being created in 433 * @ip: The inode 434 * @symname: The symlink destination (if a symlink) 435 * @bhp: The buffer head (returned to caller) 436 * 437 */ 438 439 static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip, 440 const char *symname) 441 { 442 struct gfs2_dinode *di; 443 struct buffer_head *dibh; 444 445 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr); 446 gfs2_trans_add_meta(ip->i_gl, dibh); 447 di = (struct gfs2_dinode *)dibh->b_data; 448 gfs2_dinode_out(ip, di); 449 450 di->di_major = cpu_to_be32(MAJOR(ip->i_inode.i_rdev)); 451 di->di_minor = cpu_to_be32(MINOR(ip->i_inode.i_rdev)); 452 di->__pad1 = 0; 453 di->__pad2 = 0; 454 di->__pad3 = 0; 455 memset(&di->__pad4, 0, sizeof(di->__pad4)); 456 memset(&di->di_reserved, 0, sizeof(di->di_reserved)); 457 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); 458 459 switch(ip->i_inode.i_mode & S_IFMT) { 460 case S_IFDIR: 461 gfs2_init_dir(dibh, dip); 462 break; 463 case S_IFLNK: 464 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size); 465 break; 466 } 467 468 set_buffer_uptodate(dibh); 469 brelse(dibh); 470 } 471 472 /** 473 * gfs2_trans_da_blocks - Calculate number of blocks to link inode 474 * @dip: The directory we are linking into 475 * @da: The dir add information 476 * @nr_inodes: The number of inodes involved 477 * 478 * This calculate the number of blocks we need to reserve in a 479 * transaction to link @nr_inodes into a directory. In most cases 480 * @nr_inodes will be 2 (the directory plus the inode being linked in) 481 * but in case of rename, 4 may be required. 482 * 483 * Returns: Number of blocks 484 */ 485 486 static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip, 487 const struct gfs2_diradd *da, 488 unsigned nr_inodes) 489 { 490 return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) + 491 (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS; 492 } 493 494 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, 495 struct gfs2_inode *ip, struct gfs2_diradd *da) 496 { 497 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 498 struct gfs2_alloc_parms ap = { .target = da->nr_blocks, }; 499 int error; 500 501 if (da->nr_blocks) { 502 error = gfs2_quota_lock_check(dip); 503 if (error) 504 goto fail_quota_locks; 505 506 error = gfs2_inplace_reserve(dip, &ap); 507 if (error) 508 goto fail_quota_locks; 509 510 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0); 511 if (error) 512 goto fail_ipreserv; 513 } else { 514 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); 515 if (error) 516 goto fail_quota_locks; 517 } 518 519 error = gfs2_dir_add(&dip->i_inode, name, ip, da); 520 if (error) 521 goto fail_end_trans; 522 523 fail_end_trans: 524 gfs2_trans_end(sdp); 525 fail_ipreserv: 526 gfs2_inplace_release(dip); 527 fail_quota_locks: 528 gfs2_quota_unlock(dip); 529 return error; 530 } 531 532 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array, 533 void *fs_info) 534 { 535 const struct xattr *xattr; 536 int err = 0; 537 538 for (xattr = xattr_array; xattr->name != NULL; xattr++) { 539 err = __gfs2_xattr_set(inode, xattr->name, xattr->value, 540 xattr->value_len, 0, 541 GFS2_EATYPE_SECURITY); 542 if (err < 0) 543 break; 544 } 545 return err; 546 } 547 548 static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip, 549 const struct qstr *qstr) 550 { 551 return security_inode_init_security(&ip->i_inode, &dip->i_inode, qstr, 552 &gfs2_initxattrs, NULL); 553 } 554 555 /** 556 * gfs2_create_inode - Create a new inode 557 * @dir: The parent directory 558 * @dentry: The new dentry 559 * @file: If non-NULL, the file which is being opened 560 * @mode: The permissions on the new inode 561 * @dev: For device nodes, this is the device number 562 * @symname: For symlinks, this is the link destination 563 * @size: The initial size of the inode (ignored for directories) 564 * 565 * Returns: 0 on success, or error code 566 */ 567 568 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry, 569 struct file *file, 570 umode_t mode, dev_t dev, const char *symname, 571 unsigned int size, int excl, int *opened) 572 { 573 const struct qstr *name = &dentry->d_name; 574 struct gfs2_holder ghs[2]; 575 struct inode *inode = NULL; 576 struct gfs2_inode *dip = GFS2_I(dir), *ip; 577 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 578 struct gfs2_glock *io_gl; 579 struct dentry *d; 580 int error; 581 u32 aflags = 0; 582 struct gfs2_diradd da = { .bh = NULL, }; 583 584 if (!name->len || name->len > GFS2_FNAMESIZE) 585 return -ENAMETOOLONG; 586 587 error = gfs2_rs_alloc(dip); 588 if (error) 589 return error; 590 591 error = gfs2_rindex_update(sdp); 592 if (error) 593 return error; 594 595 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 596 if (error) 597 goto fail; 598 599 error = create_ok(dip, name, mode); 600 if (error) 601 goto fail_gunlock; 602 603 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl); 604 error = PTR_ERR(inode); 605 if (!IS_ERR(inode)) { 606 d = d_splice_alias(inode, dentry); 607 error = 0; 608 if (file) { 609 if (S_ISREG(inode->i_mode)) { 610 WARN_ON(d != NULL); 611 error = finish_open(file, dentry, gfs2_open_common, opened); 612 } else { 613 error = finish_no_open(file, d); 614 } 615 } else { 616 dput(d); 617 } 618 gfs2_glock_dq_uninit(ghs); 619 return error; 620 } else if (error != -ENOENT) { 621 goto fail_gunlock; 622 } 623 624 error = gfs2_diradd_alloc_required(dir, name, &da); 625 if (error < 0) 626 goto fail_gunlock; 627 628 inode = new_inode(sdp->sd_vfs); 629 error = -ENOMEM; 630 if (!inode) 631 goto fail_gunlock; 632 633 ip = GFS2_I(inode); 634 error = gfs2_rs_alloc(ip); 635 if (error) 636 goto fail_free_inode; 637 638 inode->i_mode = mode; 639 set_nlink(inode, S_ISDIR(mode) ? 2 : 1); 640 inode->i_rdev = dev; 641 inode->i_size = size; 642 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 643 gfs2_set_inode_blocks(inode, 1); 644 munge_mode_uid_gid(dip, inode); 645 ip->i_goal = dip->i_goal; 646 ip->i_diskflags = 0; 647 ip->i_eattr = 0; 648 ip->i_height = 0; 649 ip->i_depth = 0; 650 ip->i_entries = 0; 651 652 switch(mode & S_IFMT) { 653 case S_IFREG: 654 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) || 655 gfs2_tune_get(sdp, gt_new_files_jdata)) 656 ip->i_diskflags |= GFS2_DIF_JDATA; 657 gfs2_set_aops(inode); 658 break; 659 case S_IFDIR: 660 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA); 661 ip->i_diskflags |= GFS2_DIF_JDATA; 662 ip->i_entries = 2; 663 break; 664 } 665 gfs2_set_inode_flags(inode); 666 667 if ((GFS2_I(sdp->sd_root_dir->d_inode) == dip) || 668 (dip->i_diskflags & GFS2_DIF_TOPDIR)) 669 aflags |= GFS2_AF_ORLOV; 670 671 error = alloc_dinode(ip, aflags); 672 if (error) 673 goto fail_free_inode; 674 675 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); 676 if (error) 677 goto fail_free_inode; 678 679 ip->i_gl->gl_object = ip; 680 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1); 681 if (error) 682 goto fail_free_inode; 683 684 error = gfs2_trans_begin(sdp, RES_DINODE, 0); 685 if (error) 686 goto fail_gunlock2; 687 688 init_dinode(dip, ip, symname); 689 gfs2_trans_end(sdp); 690 691 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl); 692 if (error) 693 goto fail_gunlock2; 694 695 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); 696 if (error) 697 goto fail_gunlock2; 698 699 ip->i_iopen_gh.gh_gl->gl_object = ip; 700 gfs2_glock_put(io_gl); 701 gfs2_set_iop(inode); 702 insert_inode_hash(inode); 703 704 error = gfs2_acl_create(dip, inode); 705 if (error) 706 goto fail_gunlock3; 707 708 error = gfs2_security_init(dip, ip, name); 709 if (error) 710 goto fail_gunlock3; 711 712 error = link_dinode(dip, name, ip, &da); 713 if (error) 714 goto fail_gunlock3; 715 716 mark_inode_dirty(inode); 717 d_instantiate(dentry, inode); 718 if (file) { 719 *opened |= FILE_CREATED; 720 error = finish_open(file, dentry, gfs2_open_common, opened); 721 } 722 gfs2_glock_dq_uninit(ghs); 723 gfs2_glock_dq_uninit(ghs + 1); 724 return error; 725 726 fail_gunlock3: 727 gfs2_glock_dq_uninit(ghs + 1); 728 if (ip->i_gl) 729 gfs2_glock_put(ip->i_gl); 730 goto fail_gunlock; 731 732 fail_gunlock2: 733 gfs2_glock_dq_uninit(ghs + 1); 734 fail_free_inode: 735 if (ip->i_gl) 736 gfs2_glock_put(ip->i_gl); 737 gfs2_rs_delete(ip, NULL); 738 free_inode_nonrcu(inode); 739 inode = NULL; 740 fail_gunlock: 741 gfs2_dir_no_add(&da); 742 gfs2_glock_dq_uninit(ghs); 743 if (inode && !IS_ERR(inode)) { 744 clear_nlink(inode); 745 mark_inode_dirty(inode); 746 set_bit(GIF_ALLOC_FAILED, &GFS2_I(inode)->i_flags); 747 iput(inode); 748 } 749 fail: 750 return error; 751 } 752 753 /** 754 * gfs2_create - Create a file 755 * @dir: The directory in which to create the file 756 * @dentry: The dentry of the new file 757 * @mode: The mode of the new file 758 * 759 * Returns: errno 760 */ 761 762 static int gfs2_create(struct inode *dir, struct dentry *dentry, 763 umode_t mode, bool excl) 764 { 765 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl, NULL); 766 } 767 768 /** 769 * __gfs2_lookup - Look up a filename in a directory and return its inode 770 * @dir: The directory inode 771 * @dentry: The dentry of the new inode 772 * @file: File to be opened 773 * @opened: atomic_open flags 774 * 775 * 776 * Returns: errno 777 */ 778 779 static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry, 780 struct file *file, int *opened) 781 { 782 struct inode *inode; 783 struct dentry *d; 784 struct gfs2_holder gh; 785 struct gfs2_glock *gl; 786 int error; 787 788 inode = gfs2_lookupi(dir, &dentry->d_name, 0); 789 if (!inode) 790 return NULL; 791 if (IS_ERR(inode)) 792 return ERR_CAST(inode); 793 794 gl = GFS2_I(inode)->i_gl; 795 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 796 if (error) { 797 iput(inode); 798 return ERR_PTR(error); 799 } 800 801 d = d_splice_alias(inode, dentry); 802 if (file && S_ISREG(inode->i_mode)) 803 error = finish_open(file, dentry, gfs2_open_common, opened); 804 805 gfs2_glock_dq_uninit(&gh); 806 if (error) { 807 dput(d); 808 return ERR_PTR(error); 809 } 810 return d; 811 } 812 813 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry, 814 unsigned flags) 815 { 816 return __gfs2_lookup(dir, dentry, NULL, NULL); 817 } 818 819 /** 820 * gfs2_link - Link to a file 821 * @old_dentry: The inode to link 822 * @dir: Add link to this directory 823 * @dentry: The name of the link 824 * 825 * Link the inode in "old_dentry" into the directory "dir" with the 826 * name in "dentry". 827 * 828 * Returns: errno 829 */ 830 831 static int gfs2_link(struct dentry *old_dentry, struct inode *dir, 832 struct dentry *dentry) 833 { 834 struct gfs2_inode *dip = GFS2_I(dir); 835 struct gfs2_sbd *sdp = GFS2_SB(dir); 836 struct inode *inode = old_dentry->d_inode; 837 struct gfs2_inode *ip = GFS2_I(inode); 838 struct gfs2_holder ghs[2]; 839 struct buffer_head *dibh; 840 struct gfs2_diradd da = { .bh = NULL, }; 841 int error; 842 843 if (S_ISDIR(inode->i_mode)) 844 return -EPERM; 845 846 error = gfs2_rs_alloc(dip); 847 if (error) 848 return error; 849 850 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 851 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); 852 853 error = gfs2_glock_nq(ghs); /* parent */ 854 if (error) 855 goto out_parent; 856 857 error = gfs2_glock_nq(ghs + 1); /* child */ 858 if (error) 859 goto out_child; 860 861 error = -ENOENT; 862 if (inode->i_nlink == 0) 863 goto out_gunlock; 864 865 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC); 866 if (error) 867 goto out_gunlock; 868 869 error = gfs2_dir_check(dir, &dentry->d_name, NULL); 870 switch (error) { 871 case -ENOENT: 872 break; 873 case 0: 874 error = -EEXIST; 875 default: 876 goto out_gunlock; 877 } 878 879 error = -EINVAL; 880 if (!dip->i_inode.i_nlink) 881 goto out_gunlock; 882 error = -EFBIG; 883 if (dip->i_entries == (u32)-1) 884 goto out_gunlock; 885 error = -EPERM; 886 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 887 goto out_gunlock; 888 error = -EINVAL; 889 if (!ip->i_inode.i_nlink) 890 goto out_gunlock; 891 error = -EMLINK; 892 if (ip->i_inode.i_nlink == (u32)-1) 893 goto out_gunlock; 894 895 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da); 896 if (error < 0) 897 goto out_gunlock; 898 899 if (da.nr_blocks) { 900 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, }; 901 error = gfs2_quota_lock_check(dip); 902 if (error) 903 goto out_gunlock; 904 905 error = gfs2_inplace_reserve(dip, &ap); 906 if (error) 907 goto out_gunlock_q; 908 909 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0); 910 if (error) 911 goto out_ipres; 912 } else { 913 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0); 914 if (error) 915 goto out_ipres; 916 } 917 918 error = gfs2_meta_inode_buffer(ip, &dibh); 919 if (error) 920 goto out_end_trans; 921 922 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da); 923 if (error) 924 goto out_brelse; 925 926 gfs2_trans_add_meta(ip->i_gl, dibh); 927 inc_nlink(&ip->i_inode); 928 ip->i_inode.i_ctime = CURRENT_TIME; 929 ihold(inode); 930 d_instantiate(dentry, inode); 931 mark_inode_dirty(inode); 932 933 out_brelse: 934 brelse(dibh); 935 out_end_trans: 936 gfs2_trans_end(sdp); 937 out_ipres: 938 if (da.nr_blocks) 939 gfs2_inplace_release(dip); 940 out_gunlock_q: 941 if (da.nr_blocks) 942 gfs2_quota_unlock(dip); 943 out_gunlock: 944 gfs2_dir_no_add(&da); 945 gfs2_glock_dq(ghs + 1); 946 out_child: 947 gfs2_glock_dq(ghs); 948 out_parent: 949 gfs2_holder_uninit(ghs); 950 gfs2_holder_uninit(ghs + 1); 951 return error; 952 } 953 954 /* 955 * gfs2_unlink_ok - check to see that a inode is still in a directory 956 * @dip: the directory 957 * @name: the name of the file 958 * @ip: the inode 959 * 960 * Assumes that the lock on (at least) @dip is held. 961 * 962 * Returns: 0 if the parent/child relationship is correct, errno if it isn't 963 */ 964 965 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, 966 const struct gfs2_inode *ip) 967 { 968 int error; 969 970 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) 971 return -EPERM; 972 973 if ((dip->i_inode.i_mode & S_ISVTX) && 974 !uid_eq(dip->i_inode.i_uid, current_fsuid()) && 975 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER)) 976 return -EPERM; 977 978 if (IS_APPEND(&dip->i_inode)) 979 return -EPERM; 980 981 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC); 982 if (error) 983 return error; 984 985 error = gfs2_dir_check(&dip->i_inode, name, ip); 986 if (error) 987 return error; 988 989 return 0; 990 } 991 992 /** 993 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it 994 * @dip: The parent directory 995 * @name: The name of the entry in the parent directory 996 * @inode: The inode to be removed 997 * 998 * Called with all the locks and in a transaction. This will only be 999 * called for a directory after it has been checked to ensure it is empty. 1000 * 1001 * Returns: 0 on success, or an error 1002 */ 1003 1004 static int gfs2_unlink_inode(struct gfs2_inode *dip, 1005 const struct dentry *dentry) 1006 { 1007 struct inode *inode = dentry->d_inode; 1008 struct gfs2_inode *ip = GFS2_I(inode); 1009 int error; 1010 1011 error = gfs2_dir_del(dip, dentry); 1012 if (error) 1013 return error; 1014 1015 ip->i_entries = 0; 1016 inode->i_ctime = CURRENT_TIME; 1017 if (S_ISDIR(inode->i_mode)) 1018 clear_nlink(inode); 1019 else 1020 drop_nlink(inode); 1021 mark_inode_dirty(inode); 1022 if (inode->i_nlink == 0) 1023 gfs2_unlink_di(inode); 1024 return 0; 1025 } 1026 1027 1028 /** 1029 * gfs2_unlink - Unlink an inode (this does rmdir as well) 1030 * @dir: The inode of the directory containing the inode to unlink 1031 * @dentry: The file itself 1032 * 1033 * This routine uses the type of the inode as a flag to figure out 1034 * whether this is an unlink or an rmdir. 1035 * 1036 * Returns: errno 1037 */ 1038 1039 static int gfs2_unlink(struct inode *dir, struct dentry *dentry) 1040 { 1041 struct gfs2_inode *dip = GFS2_I(dir); 1042 struct gfs2_sbd *sdp = GFS2_SB(dir); 1043 struct inode *inode = dentry->d_inode; 1044 struct gfs2_inode *ip = GFS2_I(inode); 1045 struct gfs2_holder ghs[3]; 1046 struct gfs2_rgrpd *rgd; 1047 int error; 1048 1049 error = gfs2_rindex_update(sdp); 1050 if (error) 1051 return error; 1052 1053 error = -EROFS; 1054 1055 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 1056 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); 1057 1058 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1); 1059 if (!rgd) 1060 goto out_inodes; 1061 1062 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2); 1063 1064 1065 error = gfs2_glock_nq(ghs); /* parent */ 1066 if (error) 1067 goto out_parent; 1068 1069 error = gfs2_glock_nq(ghs + 1); /* child */ 1070 if (error) 1071 goto out_child; 1072 1073 error = -ENOENT; 1074 if (inode->i_nlink == 0) 1075 goto out_rgrp; 1076 1077 if (S_ISDIR(inode->i_mode)) { 1078 error = -ENOTEMPTY; 1079 if (ip->i_entries > 2 || inode->i_nlink > 2) 1080 goto out_rgrp; 1081 } 1082 1083 error = gfs2_glock_nq(ghs + 2); /* rgrp */ 1084 if (error) 1085 goto out_rgrp; 1086 1087 error = gfs2_unlink_ok(dip, &dentry->d_name, ip); 1088 if (error) 1089 goto out_gunlock; 1090 1091 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0); 1092 if (error) 1093 goto out_end_trans; 1094 1095 error = gfs2_unlink_inode(dip, dentry); 1096 1097 out_end_trans: 1098 gfs2_trans_end(sdp); 1099 out_gunlock: 1100 gfs2_glock_dq(ghs + 2); 1101 out_rgrp: 1102 gfs2_glock_dq(ghs + 1); 1103 out_child: 1104 gfs2_glock_dq(ghs); 1105 out_parent: 1106 gfs2_holder_uninit(ghs + 2); 1107 out_inodes: 1108 gfs2_holder_uninit(ghs + 1); 1109 gfs2_holder_uninit(ghs); 1110 return error; 1111 } 1112 1113 /** 1114 * gfs2_symlink - Create a symlink 1115 * @dir: The directory to create the symlink in 1116 * @dentry: The dentry to put the symlink in 1117 * @symname: The thing which the link points to 1118 * 1119 * Returns: errno 1120 */ 1121 1122 static int gfs2_symlink(struct inode *dir, struct dentry *dentry, 1123 const char *symname) 1124 { 1125 struct gfs2_sbd *sdp = GFS2_SB(dir); 1126 unsigned int size; 1127 1128 size = strlen(symname); 1129 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1) 1130 return -ENAMETOOLONG; 1131 1132 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0, NULL); 1133 } 1134 1135 /** 1136 * gfs2_mkdir - Make a directory 1137 * @dir: The parent directory of the new one 1138 * @dentry: The dentry of the new directory 1139 * @mode: The mode of the new directory 1140 * 1141 * Returns: errno 1142 */ 1143 1144 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 1145 { 1146 struct gfs2_sbd *sdp = GFS2_SB(dir); 1147 unsigned dsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode); 1148 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0, NULL); 1149 } 1150 1151 /** 1152 * gfs2_mknod - Make a special file 1153 * @dir: The directory in which the special file will reside 1154 * @dentry: The dentry of the special file 1155 * @mode: The mode of the special file 1156 * @dev: The device specification of the special file 1157 * 1158 */ 1159 1160 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, 1161 dev_t dev) 1162 { 1163 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0, NULL); 1164 } 1165 1166 /** 1167 * gfs2_atomic_open - Atomically open a file 1168 * @dir: The directory 1169 * @dentry: The proposed new entry 1170 * @file: The proposed new struct file 1171 * @flags: open flags 1172 * @mode: File mode 1173 * @opened: Flag to say whether the file has been opened or not 1174 * 1175 * Returns: error code or 0 for success 1176 */ 1177 1178 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry, 1179 struct file *file, unsigned flags, 1180 umode_t mode, int *opened) 1181 { 1182 struct dentry *d; 1183 bool excl = !!(flags & O_EXCL); 1184 1185 d = __gfs2_lookup(dir, dentry, file, opened); 1186 if (IS_ERR(d)) 1187 return PTR_ERR(d); 1188 if (d != NULL) 1189 dentry = d; 1190 if (dentry->d_inode) { 1191 if (!(*opened & FILE_OPENED)) { 1192 if (d == NULL) 1193 dget(dentry); 1194 return finish_no_open(file, dentry); 1195 } 1196 dput(d); 1197 return 0; 1198 } 1199 1200 BUG_ON(d != NULL); 1201 if (!(flags & O_CREAT)) 1202 return -ENOENT; 1203 1204 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl, opened); 1205 } 1206 1207 /* 1208 * gfs2_ok_to_move - check if it's ok to move a directory to another directory 1209 * @this: move this 1210 * @to: to here 1211 * 1212 * Follow @to back to the root and make sure we don't encounter @this 1213 * Assumes we already hold the rename lock. 1214 * 1215 * Returns: errno 1216 */ 1217 1218 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) 1219 { 1220 struct inode *dir = &to->i_inode; 1221 struct super_block *sb = dir->i_sb; 1222 struct inode *tmp; 1223 int error = 0; 1224 1225 igrab(dir); 1226 1227 for (;;) { 1228 if (dir == &this->i_inode) { 1229 error = -EINVAL; 1230 break; 1231 } 1232 if (dir == sb->s_root->d_inode) { 1233 error = 0; 1234 break; 1235 } 1236 1237 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1); 1238 if (IS_ERR(tmp)) { 1239 error = PTR_ERR(tmp); 1240 break; 1241 } 1242 1243 iput(dir); 1244 dir = tmp; 1245 } 1246 1247 iput(dir); 1248 1249 return error; 1250 } 1251 1252 /** 1253 * gfs2_rename - Rename a file 1254 * @odir: Parent directory of old file name 1255 * @odentry: The old dentry of the file 1256 * @ndir: Parent directory of new file name 1257 * @ndentry: The new dentry of the file 1258 * 1259 * Returns: errno 1260 */ 1261 1262 static int gfs2_rename(struct inode *odir, struct dentry *odentry, 1263 struct inode *ndir, struct dentry *ndentry) 1264 { 1265 struct gfs2_inode *odip = GFS2_I(odir); 1266 struct gfs2_inode *ndip = GFS2_I(ndir); 1267 struct gfs2_inode *ip = GFS2_I(odentry->d_inode); 1268 struct gfs2_inode *nip = NULL; 1269 struct gfs2_sbd *sdp = GFS2_SB(odir); 1270 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, }; 1271 struct gfs2_rgrpd *nrgd; 1272 unsigned int num_gh; 1273 int dir_rename = 0; 1274 struct gfs2_diradd da = { .nr_blocks = 0, }; 1275 unsigned int x; 1276 int error; 1277 1278 if (ndentry->d_inode) { 1279 nip = GFS2_I(ndentry->d_inode); 1280 if (ip == nip) 1281 return 0; 1282 } 1283 1284 error = gfs2_rindex_update(sdp); 1285 if (error) 1286 return error; 1287 1288 error = gfs2_rs_alloc(ndip); 1289 if (error) 1290 return error; 1291 1292 if (odip != ndip) { 1293 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 1294 0, &r_gh); 1295 if (error) 1296 goto out; 1297 1298 if (S_ISDIR(ip->i_inode.i_mode)) { 1299 dir_rename = 1; 1300 /* don't move a dirctory into it's subdir */ 1301 error = gfs2_ok_to_move(ip, ndip); 1302 if (error) 1303 goto out_gunlock_r; 1304 } 1305 } 1306 1307 num_gh = 1; 1308 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 1309 if (odip != ndip) { 1310 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1311 num_gh++; 1312 } 1313 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1314 num_gh++; 1315 1316 if (nip) { 1317 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1318 num_gh++; 1319 /* grab the resource lock for unlink flag twiddling 1320 * this is the case of the target file already existing 1321 * so we unlink before doing the rename 1322 */ 1323 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1); 1324 if (nrgd) 1325 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++); 1326 } 1327 1328 for (x = 0; x < num_gh; x++) { 1329 error = gfs2_glock_nq(ghs + x); 1330 if (error) 1331 goto out_gunlock; 1332 } 1333 1334 error = -ENOENT; 1335 if (ip->i_inode.i_nlink == 0) 1336 goto out_gunlock; 1337 1338 /* Check out the old directory */ 1339 1340 error = gfs2_unlink_ok(odip, &odentry->d_name, ip); 1341 if (error) 1342 goto out_gunlock; 1343 1344 /* Check out the new directory */ 1345 1346 if (nip) { 1347 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); 1348 if (error) 1349 goto out_gunlock; 1350 1351 if (nip->i_inode.i_nlink == 0) { 1352 error = -EAGAIN; 1353 goto out_gunlock; 1354 } 1355 1356 if (S_ISDIR(nip->i_inode.i_mode)) { 1357 if (nip->i_entries < 2) { 1358 gfs2_consist_inode(nip); 1359 error = -EIO; 1360 goto out_gunlock; 1361 } 1362 if (nip->i_entries > 2) { 1363 error = -ENOTEMPTY; 1364 goto out_gunlock; 1365 } 1366 } 1367 } else { 1368 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC); 1369 if (error) 1370 goto out_gunlock; 1371 1372 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL); 1373 switch (error) { 1374 case -ENOENT: 1375 error = 0; 1376 break; 1377 case 0: 1378 error = -EEXIST; 1379 default: 1380 goto out_gunlock; 1381 }; 1382 1383 if (odip != ndip) { 1384 if (!ndip->i_inode.i_nlink) { 1385 error = -ENOENT; 1386 goto out_gunlock; 1387 } 1388 if (ndip->i_entries == (u32)-1) { 1389 error = -EFBIG; 1390 goto out_gunlock; 1391 } 1392 if (S_ISDIR(ip->i_inode.i_mode) && 1393 ndip->i_inode.i_nlink == (u32)-1) { 1394 error = -EMLINK; 1395 goto out_gunlock; 1396 } 1397 } 1398 } 1399 1400 /* Check out the dir to be renamed */ 1401 1402 if (dir_rename) { 1403 error = gfs2_permission(odentry->d_inode, MAY_WRITE); 1404 if (error) 1405 goto out_gunlock; 1406 } 1407 1408 if (nip == NULL) { 1409 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da); 1410 if (error) 1411 goto out_gunlock; 1412 } 1413 1414 if (da.nr_blocks) { 1415 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, }; 1416 error = gfs2_quota_lock_check(ndip); 1417 if (error) 1418 goto out_gunlock; 1419 1420 error = gfs2_inplace_reserve(ndip, &ap); 1421 if (error) 1422 goto out_gunlock_q; 1423 1424 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) + 1425 4 * RES_LEAF + 4, 0); 1426 if (error) 1427 goto out_ipreserv; 1428 } else { 1429 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 1430 5 * RES_LEAF + 4, 0); 1431 if (error) 1432 goto out_gunlock; 1433 } 1434 1435 /* Remove the target file, if it exists */ 1436 1437 if (nip) 1438 error = gfs2_unlink_inode(ndip, ndentry); 1439 1440 if (dir_rename) { 1441 error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR); 1442 if (error) 1443 goto out_end_trans; 1444 } else { 1445 struct buffer_head *dibh; 1446 error = gfs2_meta_inode_buffer(ip, &dibh); 1447 if (error) 1448 goto out_end_trans; 1449 ip->i_inode.i_ctime = CURRENT_TIME; 1450 gfs2_trans_add_meta(ip->i_gl, dibh); 1451 gfs2_dinode_out(ip, dibh->b_data); 1452 brelse(dibh); 1453 } 1454 1455 error = gfs2_dir_del(odip, odentry); 1456 if (error) 1457 goto out_end_trans; 1458 1459 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da); 1460 if (error) 1461 goto out_end_trans; 1462 1463 out_end_trans: 1464 gfs2_trans_end(sdp); 1465 out_ipreserv: 1466 if (da.nr_blocks) 1467 gfs2_inplace_release(ndip); 1468 out_gunlock_q: 1469 if (da.nr_blocks) 1470 gfs2_quota_unlock(ndip); 1471 out_gunlock: 1472 gfs2_dir_no_add(&da); 1473 while (x--) { 1474 gfs2_glock_dq(ghs + x); 1475 gfs2_holder_uninit(ghs + x); 1476 } 1477 out_gunlock_r: 1478 if (r_gh.gh_gl) 1479 gfs2_glock_dq_uninit(&r_gh); 1480 out: 1481 return error; 1482 } 1483 1484 /** 1485 * gfs2_follow_link - Follow a symbolic link 1486 * @dentry: The dentry of the link 1487 * @nd: Data that we pass to vfs_follow_link() 1488 * 1489 * This can handle symlinks of any size. 1490 * 1491 * Returns: 0 on success or error code 1492 */ 1493 1494 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd) 1495 { 1496 struct gfs2_inode *ip = GFS2_I(dentry->d_inode); 1497 struct gfs2_holder i_gh; 1498 struct buffer_head *dibh; 1499 unsigned int size; 1500 char *buf; 1501 int error; 1502 1503 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); 1504 error = gfs2_glock_nq(&i_gh); 1505 if (error) { 1506 gfs2_holder_uninit(&i_gh); 1507 nd_set_link(nd, ERR_PTR(error)); 1508 return NULL; 1509 } 1510 1511 size = (unsigned int)i_size_read(&ip->i_inode); 1512 if (size == 0) { 1513 gfs2_consist_inode(ip); 1514 buf = ERR_PTR(-EIO); 1515 goto out; 1516 } 1517 1518 error = gfs2_meta_inode_buffer(ip, &dibh); 1519 if (error) { 1520 buf = ERR_PTR(error); 1521 goto out; 1522 } 1523 1524 buf = kzalloc(size + 1, GFP_NOFS); 1525 if (!buf) 1526 buf = ERR_PTR(-ENOMEM); 1527 else 1528 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size); 1529 brelse(dibh); 1530 out: 1531 gfs2_glock_dq_uninit(&i_gh); 1532 nd_set_link(nd, buf); 1533 return NULL; 1534 } 1535 1536 /** 1537 * gfs2_permission - 1538 * @inode: The inode 1539 * @mask: The mask to be tested 1540 * @flags: Indicates whether this is an RCU path walk or not 1541 * 1542 * This may be called from the VFS directly, or from within GFS2 with the 1543 * inode locked, so we look to see if the glock is already locked and only 1544 * lock the glock if its not already been done. 1545 * 1546 * Returns: errno 1547 */ 1548 1549 int gfs2_permission(struct inode *inode, int mask) 1550 { 1551 struct gfs2_inode *ip; 1552 struct gfs2_holder i_gh; 1553 int error; 1554 int unlock = 0; 1555 1556 1557 ip = GFS2_I(inode); 1558 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 1559 if (mask & MAY_NOT_BLOCK) 1560 return -ECHILD; 1561 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); 1562 if (error) 1563 return error; 1564 unlock = 1; 1565 } 1566 1567 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode)) 1568 error = -EACCES; 1569 else 1570 error = generic_permission(inode, mask); 1571 if (unlock) 1572 gfs2_glock_dq_uninit(&i_gh); 1573 1574 return error; 1575 } 1576 1577 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1578 { 1579 setattr_copy(inode, attr); 1580 mark_inode_dirty(inode); 1581 return 0; 1582 } 1583 1584 /** 1585 * gfs2_setattr_simple - 1586 * @ip: 1587 * @attr: 1588 * 1589 * Returns: errno 1590 */ 1591 1592 int gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1593 { 1594 int error; 1595 1596 if (current->journal_info) 1597 return __gfs2_setattr_simple(inode, attr); 1598 1599 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0); 1600 if (error) 1601 return error; 1602 1603 error = __gfs2_setattr_simple(inode, attr); 1604 gfs2_trans_end(GFS2_SB(inode)); 1605 return error; 1606 } 1607 1608 static int setattr_chown(struct inode *inode, struct iattr *attr) 1609 { 1610 struct gfs2_inode *ip = GFS2_I(inode); 1611 struct gfs2_sbd *sdp = GFS2_SB(inode); 1612 kuid_t ouid, nuid; 1613 kgid_t ogid, ngid; 1614 int error; 1615 1616 ouid = inode->i_uid; 1617 ogid = inode->i_gid; 1618 nuid = attr->ia_uid; 1619 ngid = attr->ia_gid; 1620 1621 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid)) 1622 ouid = nuid = NO_UID_QUOTA_CHANGE; 1623 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid)) 1624 ogid = ngid = NO_GID_QUOTA_CHANGE; 1625 1626 error = gfs2_quota_lock(ip, nuid, ngid); 1627 if (error) 1628 return error; 1629 1630 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 1631 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 1632 error = gfs2_quota_check(ip, nuid, ngid); 1633 if (error) 1634 goto out_gunlock_q; 1635 } 1636 1637 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0); 1638 if (error) 1639 goto out_gunlock_q; 1640 1641 error = gfs2_setattr_simple(inode, attr); 1642 if (error) 1643 goto out_end_trans; 1644 1645 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 1646 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 1647 u64 blocks = gfs2_get_inode_blocks(&ip->i_inode); 1648 gfs2_quota_change(ip, -blocks, ouid, ogid); 1649 gfs2_quota_change(ip, blocks, nuid, ngid); 1650 } 1651 1652 out_end_trans: 1653 gfs2_trans_end(sdp); 1654 out_gunlock_q: 1655 gfs2_quota_unlock(ip); 1656 return error; 1657 } 1658 1659 /** 1660 * gfs2_setattr - Change attributes on an inode 1661 * @dentry: The dentry which is changing 1662 * @attr: The structure describing the change 1663 * 1664 * The VFS layer wants to change one or more of an inodes attributes. Write 1665 * that change out to disk. 1666 * 1667 * Returns: errno 1668 */ 1669 1670 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr) 1671 { 1672 struct inode *inode = dentry->d_inode; 1673 struct gfs2_inode *ip = GFS2_I(inode); 1674 struct gfs2_holder i_gh; 1675 int error; 1676 1677 error = gfs2_rs_alloc(ip); 1678 if (error) 1679 return error; 1680 1681 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); 1682 if (error) 1683 return error; 1684 1685 error = -EPERM; 1686 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 1687 goto out; 1688 1689 error = inode_change_ok(inode, attr); 1690 if (error) 1691 goto out; 1692 1693 if (attr->ia_valid & ATTR_SIZE) 1694 error = gfs2_setattr_size(inode, attr->ia_size); 1695 else if (attr->ia_valid & (ATTR_UID | ATTR_GID)) 1696 error = setattr_chown(inode, attr); 1697 else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode)) 1698 error = gfs2_acl_chmod(ip, attr); 1699 else 1700 error = gfs2_setattr_simple(inode, attr); 1701 1702 out: 1703 if (!error) 1704 mark_inode_dirty(inode); 1705 gfs2_glock_dq_uninit(&i_gh); 1706 return error; 1707 } 1708 1709 /** 1710 * gfs2_getattr - Read out an inode's attributes 1711 * @mnt: The vfsmount the inode is being accessed from 1712 * @dentry: The dentry to stat 1713 * @stat: The inode's stats 1714 * 1715 * This may be called from the VFS directly, or from within GFS2 with the 1716 * inode locked, so we look to see if the glock is already locked and only 1717 * lock the glock if its not already been done. Note that its the NFS 1718 * readdirplus operation which causes this to be called (from filldir) 1719 * with the glock already held. 1720 * 1721 * Returns: errno 1722 */ 1723 1724 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry, 1725 struct kstat *stat) 1726 { 1727 struct inode *inode = dentry->d_inode; 1728 struct gfs2_inode *ip = GFS2_I(inode); 1729 struct gfs2_holder gh; 1730 int error; 1731 int unlock = 0; 1732 1733 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 1734 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 1735 if (error) 1736 return error; 1737 unlock = 1; 1738 } 1739 1740 generic_fillattr(inode, stat); 1741 if (unlock) 1742 gfs2_glock_dq_uninit(&gh); 1743 1744 return 0; 1745 } 1746 1747 static int gfs2_setxattr(struct dentry *dentry, const char *name, 1748 const void *data, size_t size, int flags) 1749 { 1750 struct inode *inode = dentry->d_inode; 1751 struct gfs2_inode *ip = GFS2_I(inode); 1752 struct gfs2_holder gh; 1753 int ret; 1754 1755 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 1756 ret = gfs2_glock_nq(&gh); 1757 if (ret == 0) { 1758 ret = gfs2_rs_alloc(ip); 1759 if (ret == 0) 1760 ret = generic_setxattr(dentry, name, data, size, flags); 1761 gfs2_glock_dq(&gh); 1762 } 1763 gfs2_holder_uninit(&gh); 1764 return ret; 1765 } 1766 1767 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name, 1768 void *data, size_t size) 1769 { 1770 struct inode *inode = dentry->d_inode; 1771 struct gfs2_inode *ip = GFS2_I(inode); 1772 struct gfs2_holder gh; 1773 int ret; 1774 1775 /* For selinux during lookup */ 1776 if (gfs2_glock_is_locked_by_me(ip->i_gl)) 1777 return generic_getxattr(dentry, name, data, size); 1778 1779 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 1780 ret = gfs2_glock_nq(&gh); 1781 if (ret == 0) { 1782 ret = generic_getxattr(dentry, name, data, size); 1783 gfs2_glock_dq(&gh); 1784 } 1785 gfs2_holder_uninit(&gh); 1786 return ret; 1787 } 1788 1789 static int gfs2_removexattr(struct dentry *dentry, const char *name) 1790 { 1791 struct inode *inode = dentry->d_inode; 1792 struct gfs2_inode *ip = GFS2_I(inode); 1793 struct gfs2_holder gh; 1794 int ret; 1795 1796 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 1797 ret = gfs2_glock_nq(&gh); 1798 if (ret == 0) { 1799 ret = gfs2_rs_alloc(ip); 1800 if (ret == 0) 1801 ret = generic_removexattr(dentry, name); 1802 gfs2_glock_dq(&gh); 1803 } 1804 gfs2_holder_uninit(&gh); 1805 return ret; 1806 } 1807 1808 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 1809 u64 start, u64 len) 1810 { 1811 struct gfs2_inode *ip = GFS2_I(inode); 1812 struct gfs2_holder gh; 1813 int ret; 1814 1815 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC); 1816 if (ret) 1817 return ret; 1818 1819 mutex_lock(&inode->i_mutex); 1820 1821 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 1822 if (ret) 1823 goto out; 1824 1825 if (gfs2_is_stuffed(ip)) { 1826 u64 phys = ip->i_no_addr << inode->i_blkbits; 1827 u64 size = i_size_read(inode); 1828 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED| 1829 FIEMAP_EXTENT_DATA_INLINE; 1830 phys += sizeof(struct gfs2_dinode); 1831 phys += start; 1832 if (start + len > size) 1833 len = size - start; 1834 if (start < size) 1835 ret = fiemap_fill_next_extent(fieinfo, start, phys, 1836 len, flags); 1837 if (ret == 1) 1838 ret = 0; 1839 } else { 1840 ret = __generic_block_fiemap(inode, fieinfo, start, len, 1841 gfs2_block_map); 1842 } 1843 1844 gfs2_glock_dq_uninit(&gh); 1845 out: 1846 mutex_unlock(&inode->i_mutex); 1847 return ret; 1848 } 1849 1850 const struct inode_operations gfs2_file_iops = { 1851 .permission = gfs2_permission, 1852 .setattr = gfs2_setattr, 1853 .getattr = gfs2_getattr, 1854 .setxattr = gfs2_setxattr, 1855 .getxattr = gfs2_getxattr, 1856 .listxattr = gfs2_listxattr, 1857 .removexattr = gfs2_removexattr, 1858 .fiemap = gfs2_fiemap, 1859 .get_acl = gfs2_get_acl, 1860 }; 1861 1862 const struct inode_operations gfs2_dir_iops = { 1863 .create = gfs2_create, 1864 .lookup = gfs2_lookup, 1865 .link = gfs2_link, 1866 .unlink = gfs2_unlink, 1867 .symlink = gfs2_symlink, 1868 .mkdir = gfs2_mkdir, 1869 .rmdir = gfs2_unlink, 1870 .mknod = gfs2_mknod, 1871 .rename = gfs2_rename, 1872 .permission = gfs2_permission, 1873 .setattr = gfs2_setattr, 1874 .getattr = gfs2_getattr, 1875 .setxattr = gfs2_setxattr, 1876 .getxattr = gfs2_getxattr, 1877 .listxattr = gfs2_listxattr, 1878 .removexattr = gfs2_removexattr, 1879 .fiemap = gfs2_fiemap, 1880 .get_acl = gfs2_get_acl, 1881 .atomic_open = gfs2_atomic_open, 1882 }; 1883 1884 const struct inode_operations gfs2_symlink_iops = { 1885 .readlink = generic_readlink, 1886 .follow_link = gfs2_follow_link, 1887 .put_link = kfree_put_link, 1888 .permission = gfs2_permission, 1889 .setattr = gfs2_setattr, 1890 .getattr = gfs2_getattr, 1891 .setxattr = gfs2_setxattr, 1892 .getxattr = gfs2_getxattr, 1893 .listxattr = gfs2_listxattr, 1894 .removexattr = gfs2_removexattr, 1895 .fiemap = gfs2_fiemap, 1896 .get_acl = gfs2_get_acl, 1897 }; 1898 1899