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 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, 473 struct gfs2_inode *ip, int arq) 474 { 475 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 476 struct gfs2_alloc_parms ap = { .target = sdp->sd_max_dirres, }; 477 int error; 478 479 if (arq) { 480 error = gfs2_quota_lock_check(dip); 481 if (error) 482 goto fail_quota_locks; 483 484 error = gfs2_inplace_reserve(dip, &ap); 485 if (error) 486 goto fail_quota_locks; 487 488 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + 489 dip->i_rgd->rd_length + 490 2 * RES_DINODE + 491 RES_STATFS + RES_QUOTA, 0); 492 if (error) 493 goto fail_ipreserv; 494 } else { 495 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); 496 if (error) 497 goto fail_quota_locks; 498 } 499 500 error = gfs2_dir_add(&dip->i_inode, name, ip); 501 if (error) 502 goto fail_end_trans; 503 504 fail_end_trans: 505 gfs2_trans_end(sdp); 506 fail_ipreserv: 507 gfs2_inplace_release(dip); 508 fail_quota_locks: 509 gfs2_quota_unlock(dip); 510 return error; 511 } 512 513 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array, 514 void *fs_info) 515 { 516 const struct xattr *xattr; 517 int err = 0; 518 519 for (xattr = xattr_array; xattr->name != NULL; xattr++) { 520 err = __gfs2_xattr_set(inode, xattr->name, xattr->value, 521 xattr->value_len, 0, 522 GFS2_EATYPE_SECURITY); 523 if (err < 0) 524 break; 525 } 526 return err; 527 } 528 529 static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip, 530 const struct qstr *qstr) 531 { 532 return security_inode_init_security(&ip->i_inode, &dip->i_inode, qstr, 533 &gfs2_initxattrs, NULL); 534 } 535 536 /** 537 * gfs2_create_inode - Create a new inode 538 * @dir: The parent directory 539 * @dentry: The new dentry 540 * @file: If non-NULL, the file which is being opened 541 * @mode: The permissions on the new inode 542 * @dev: For device nodes, this is the device number 543 * @symname: For symlinks, this is the link destination 544 * @size: The initial size of the inode (ignored for directories) 545 * 546 * Returns: 0 on success, or error code 547 */ 548 549 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry, 550 struct file *file, 551 umode_t mode, dev_t dev, const char *symname, 552 unsigned int size, int excl, int *opened) 553 { 554 const struct qstr *name = &dentry->d_name; 555 struct posix_acl *default_acl, *acl; 556 struct gfs2_holder ghs[2]; 557 struct inode *inode = NULL; 558 struct gfs2_inode *dip = GFS2_I(dir), *ip; 559 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 560 struct gfs2_glock *io_gl; 561 struct dentry *d; 562 int error; 563 u32 aflags = 0; 564 int arq; 565 566 if (!name->len || name->len > GFS2_FNAMESIZE) 567 return -ENAMETOOLONG; 568 569 error = gfs2_rs_alloc(dip); 570 if (error) 571 return error; 572 573 error = gfs2_rindex_update(sdp); 574 if (error) 575 return error; 576 577 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 578 if (error) 579 goto fail; 580 581 error = create_ok(dip, name, mode); 582 if (error) 583 goto fail_gunlock; 584 585 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl); 586 error = PTR_ERR(inode); 587 if (!IS_ERR(inode)) { 588 d = d_splice_alias(inode, dentry); 589 error = 0; 590 if (file) { 591 if (S_ISREG(inode->i_mode)) { 592 WARN_ON(d != NULL); 593 error = finish_open(file, dentry, gfs2_open_common, opened); 594 } else { 595 error = finish_no_open(file, d); 596 } 597 } else { 598 dput(d); 599 } 600 gfs2_glock_dq_uninit(ghs); 601 return error; 602 } else if (error != -ENOENT) { 603 goto fail_gunlock; 604 } 605 606 arq = error = gfs2_diradd_alloc_required(dir, name); 607 if (error < 0) 608 goto fail_gunlock; 609 610 inode = new_inode(sdp->sd_vfs); 611 error = -ENOMEM; 612 if (!inode) 613 goto fail_gunlock; 614 615 error = posix_acl_create(dir, &mode, &default_acl, &acl); 616 if (error) 617 goto fail_free_vfs_inode; 618 619 ip = GFS2_I(inode); 620 error = gfs2_rs_alloc(ip); 621 if (error) 622 goto fail_free_acls; 623 624 inode->i_mode = mode; 625 set_nlink(inode, S_ISDIR(mode) ? 2 : 1); 626 inode->i_rdev = dev; 627 inode->i_size = size; 628 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 629 gfs2_set_inode_blocks(inode, 1); 630 munge_mode_uid_gid(dip, inode); 631 ip->i_goal = dip->i_goal; 632 ip->i_diskflags = 0; 633 ip->i_eattr = 0; 634 ip->i_height = 0; 635 ip->i_depth = 0; 636 ip->i_entries = 0; 637 638 switch(mode & S_IFMT) { 639 case S_IFREG: 640 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) || 641 gfs2_tune_get(sdp, gt_new_files_jdata)) 642 ip->i_diskflags |= GFS2_DIF_JDATA; 643 gfs2_set_aops(inode); 644 break; 645 case S_IFDIR: 646 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA); 647 ip->i_diskflags |= GFS2_DIF_JDATA; 648 ip->i_entries = 2; 649 break; 650 } 651 gfs2_set_inode_flags(inode); 652 653 if ((GFS2_I(sdp->sd_root_dir->d_inode) == dip) || 654 (dip->i_diskflags & GFS2_DIF_TOPDIR)) 655 aflags |= GFS2_AF_ORLOV; 656 657 error = alloc_dinode(ip, aflags); 658 if (error) 659 goto fail_free_inode; 660 661 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); 662 if (error) 663 goto fail_free_inode; 664 665 ip->i_gl->gl_object = ip; 666 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1); 667 if (error) 668 goto fail_free_inode; 669 670 error = gfs2_trans_begin(sdp, RES_DINODE, 0); 671 if (error) 672 goto fail_gunlock2; 673 674 init_dinode(dip, ip, symname); 675 gfs2_trans_end(sdp); 676 677 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl); 678 if (error) 679 goto fail_gunlock2; 680 681 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); 682 if (error) 683 goto fail_gunlock2; 684 685 ip->i_iopen_gh.gh_gl->gl_object = ip; 686 gfs2_glock_put(io_gl); 687 gfs2_set_iop(inode); 688 insert_inode_hash(inode); 689 690 if (default_acl) { 691 error = gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT); 692 posix_acl_release(default_acl); 693 } 694 if (acl) { 695 if (!error) 696 error = gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS); 697 posix_acl_release(acl); 698 } 699 700 if (error) 701 goto fail_gunlock3; 702 703 error = gfs2_security_init(dip, ip, name); 704 if (error) 705 goto fail_gunlock3; 706 707 error = link_dinode(dip, name, ip, arq); 708 if (error) 709 goto fail_gunlock3; 710 711 mark_inode_dirty(inode); 712 d_instantiate(dentry, inode); 713 if (file) { 714 *opened |= FILE_CREATED; 715 error = finish_open(file, dentry, gfs2_open_common, opened); 716 } 717 gfs2_glock_dq_uninit(ghs); 718 gfs2_glock_dq_uninit(ghs + 1); 719 return error; 720 721 fail_gunlock3: 722 gfs2_glock_dq_uninit(ghs + 1); 723 if (ip->i_gl) 724 gfs2_glock_put(ip->i_gl); 725 goto fail_gunlock; 726 727 fail_gunlock2: 728 gfs2_glock_dq_uninit(ghs + 1); 729 fail_free_inode: 730 if (ip->i_gl) 731 gfs2_glock_put(ip->i_gl); 732 gfs2_rs_delete(ip, NULL); 733 fail_free_acls: 734 if (default_acl) 735 posix_acl_release(default_acl); 736 if (acl) 737 posix_acl_release(acl); 738 fail_free_vfs_inode: 739 free_inode_nonrcu(inode); 740 inode = NULL; 741 fail_gunlock: 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 int alloc_required; 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 alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name); 896 if (error < 0) 897 goto out_gunlock; 898 error = 0; 899 900 if (alloc_required) { 901 struct gfs2_alloc_parms ap = { .target = sdp->sd_max_dirres, }; 902 error = gfs2_quota_lock_check(dip); 903 if (error) 904 goto out_gunlock; 905 906 error = gfs2_inplace_reserve(dip, &ap); 907 if (error) 908 goto out_gunlock_q; 909 910 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + 911 gfs2_rg_blocks(dip, sdp->sd_max_dirres) + 912 2 * RES_DINODE + RES_STATFS + 913 RES_QUOTA, 0); 914 if (error) 915 goto out_ipres; 916 } else { 917 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0); 918 if (error) 919 goto out_ipres; 920 } 921 922 error = gfs2_meta_inode_buffer(ip, &dibh); 923 if (error) 924 goto out_end_trans; 925 926 error = gfs2_dir_add(dir, &dentry->d_name, ip); 927 if (error) 928 goto out_brelse; 929 930 gfs2_trans_add_meta(ip->i_gl, dibh); 931 inc_nlink(&ip->i_inode); 932 ip->i_inode.i_ctime = CURRENT_TIME; 933 ihold(inode); 934 d_instantiate(dentry, inode); 935 mark_inode_dirty(inode); 936 937 out_brelse: 938 brelse(dibh); 939 out_end_trans: 940 gfs2_trans_end(sdp); 941 out_ipres: 942 if (alloc_required) 943 gfs2_inplace_release(dip); 944 out_gunlock_q: 945 if (alloc_required) 946 gfs2_quota_unlock(dip); 947 out_gunlock: 948 gfs2_glock_dq(ghs + 1); 949 out_child: 950 gfs2_glock_dq(ghs); 951 out_parent: 952 gfs2_holder_uninit(ghs); 953 gfs2_holder_uninit(ghs + 1); 954 return error; 955 } 956 957 /* 958 * gfs2_unlink_ok - check to see that a inode is still in a directory 959 * @dip: the directory 960 * @name: the name of the file 961 * @ip: the inode 962 * 963 * Assumes that the lock on (at least) @dip is held. 964 * 965 * Returns: 0 if the parent/child relationship is correct, errno if it isn't 966 */ 967 968 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, 969 const struct gfs2_inode *ip) 970 { 971 int error; 972 973 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) 974 return -EPERM; 975 976 if ((dip->i_inode.i_mode & S_ISVTX) && 977 !uid_eq(dip->i_inode.i_uid, current_fsuid()) && 978 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER)) 979 return -EPERM; 980 981 if (IS_APPEND(&dip->i_inode)) 982 return -EPERM; 983 984 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC); 985 if (error) 986 return error; 987 988 error = gfs2_dir_check(&dip->i_inode, name, ip); 989 if (error) 990 return error; 991 992 return 0; 993 } 994 995 /** 996 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it 997 * @dip: The parent directory 998 * @name: The name of the entry in the parent directory 999 * @inode: The inode to be removed 1000 * 1001 * Called with all the locks and in a transaction. This will only be 1002 * called for a directory after it has been checked to ensure it is empty. 1003 * 1004 * Returns: 0 on success, or an error 1005 */ 1006 1007 static int gfs2_unlink_inode(struct gfs2_inode *dip, 1008 const struct dentry *dentry) 1009 { 1010 struct inode *inode = dentry->d_inode; 1011 struct gfs2_inode *ip = GFS2_I(inode); 1012 int error; 1013 1014 error = gfs2_dir_del(dip, dentry); 1015 if (error) 1016 return error; 1017 1018 ip->i_entries = 0; 1019 inode->i_ctime = CURRENT_TIME; 1020 if (S_ISDIR(inode->i_mode)) 1021 clear_nlink(inode); 1022 else 1023 drop_nlink(inode); 1024 mark_inode_dirty(inode); 1025 if (inode->i_nlink == 0) 1026 gfs2_unlink_di(inode); 1027 return 0; 1028 } 1029 1030 1031 /** 1032 * gfs2_unlink - Unlink an inode (this does rmdir as well) 1033 * @dir: The inode of the directory containing the inode to unlink 1034 * @dentry: The file itself 1035 * 1036 * This routine uses the type of the inode as a flag to figure out 1037 * whether this is an unlink or an rmdir. 1038 * 1039 * Returns: errno 1040 */ 1041 1042 static int gfs2_unlink(struct inode *dir, struct dentry *dentry) 1043 { 1044 struct gfs2_inode *dip = GFS2_I(dir); 1045 struct gfs2_sbd *sdp = GFS2_SB(dir); 1046 struct inode *inode = dentry->d_inode; 1047 struct gfs2_inode *ip = GFS2_I(inode); 1048 struct gfs2_holder ghs[3]; 1049 struct gfs2_rgrpd *rgd; 1050 int error; 1051 1052 error = gfs2_rindex_update(sdp); 1053 if (error) 1054 return error; 1055 1056 error = -EROFS; 1057 1058 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 1059 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); 1060 1061 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1); 1062 if (!rgd) 1063 goto out_inodes; 1064 1065 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2); 1066 1067 1068 error = gfs2_glock_nq(ghs); /* parent */ 1069 if (error) 1070 goto out_parent; 1071 1072 error = gfs2_glock_nq(ghs + 1); /* child */ 1073 if (error) 1074 goto out_child; 1075 1076 error = -ENOENT; 1077 if (inode->i_nlink == 0) 1078 goto out_rgrp; 1079 1080 if (S_ISDIR(inode->i_mode)) { 1081 error = -ENOTEMPTY; 1082 if (ip->i_entries > 2 || inode->i_nlink > 2) 1083 goto out_rgrp; 1084 } 1085 1086 error = gfs2_glock_nq(ghs + 2); /* rgrp */ 1087 if (error) 1088 goto out_rgrp; 1089 1090 error = gfs2_unlink_ok(dip, &dentry->d_name, ip); 1091 if (error) 1092 goto out_gunlock; 1093 1094 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0); 1095 if (error) 1096 goto out_end_trans; 1097 1098 error = gfs2_unlink_inode(dip, dentry); 1099 1100 out_end_trans: 1101 gfs2_trans_end(sdp); 1102 out_gunlock: 1103 gfs2_glock_dq(ghs + 2); 1104 out_rgrp: 1105 gfs2_glock_dq(ghs + 1); 1106 out_child: 1107 gfs2_glock_dq(ghs); 1108 out_parent: 1109 gfs2_holder_uninit(ghs + 2); 1110 out_inodes: 1111 gfs2_holder_uninit(ghs + 1); 1112 gfs2_holder_uninit(ghs); 1113 return error; 1114 } 1115 1116 /** 1117 * gfs2_symlink - Create a symlink 1118 * @dir: The directory to create the symlink in 1119 * @dentry: The dentry to put the symlink in 1120 * @symname: The thing which the link points to 1121 * 1122 * Returns: errno 1123 */ 1124 1125 static int gfs2_symlink(struct inode *dir, struct dentry *dentry, 1126 const char *symname) 1127 { 1128 struct gfs2_sbd *sdp = GFS2_SB(dir); 1129 unsigned int size; 1130 1131 size = strlen(symname); 1132 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1) 1133 return -ENAMETOOLONG; 1134 1135 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0, NULL); 1136 } 1137 1138 /** 1139 * gfs2_mkdir - Make a directory 1140 * @dir: The parent directory of the new one 1141 * @dentry: The dentry of the new directory 1142 * @mode: The mode of the new directory 1143 * 1144 * Returns: errno 1145 */ 1146 1147 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 1148 { 1149 struct gfs2_sbd *sdp = GFS2_SB(dir); 1150 unsigned dsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode); 1151 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0, NULL); 1152 } 1153 1154 /** 1155 * gfs2_mknod - Make a special file 1156 * @dir: The directory in which the special file will reside 1157 * @dentry: The dentry of the special file 1158 * @mode: The mode of the special file 1159 * @dev: The device specification of the special file 1160 * 1161 */ 1162 1163 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, 1164 dev_t dev) 1165 { 1166 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0, NULL); 1167 } 1168 1169 /** 1170 * gfs2_atomic_open - Atomically open a file 1171 * @dir: The directory 1172 * @dentry: The proposed new entry 1173 * @file: The proposed new struct file 1174 * @flags: open flags 1175 * @mode: File mode 1176 * @opened: Flag to say whether the file has been opened or not 1177 * 1178 * Returns: error code or 0 for success 1179 */ 1180 1181 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry, 1182 struct file *file, unsigned flags, 1183 umode_t mode, int *opened) 1184 { 1185 struct dentry *d; 1186 bool excl = !!(flags & O_EXCL); 1187 1188 d = __gfs2_lookup(dir, dentry, file, opened); 1189 if (IS_ERR(d)) 1190 return PTR_ERR(d); 1191 if (d != NULL) 1192 dentry = d; 1193 if (dentry->d_inode) { 1194 if (!(*opened & FILE_OPENED)) { 1195 if (d == NULL) 1196 dget(dentry); 1197 return finish_no_open(file, dentry); 1198 } 1199 dput(d); 1200 return 0; 1201 } 1202 1203 BUG_ON(d != NULL); 1204 if (!(flags & O_CREAT)) 1205 return -ENOENT; 1206 1207 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl, opened); 1208 } 1209 1210 /* 1211 * gfs2_ok_to_move - check if it's ok to move a directory to another directory 1212 * @this: move this 1213 * @to: to here 1214 * 1215 * Follow @to back to the root and make sure we don't encounter @this 1216 * Assumes we already hold the rename lock. 1217 * 1218 * Returns: errno 1219 */ 1220 1221 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) 1222 { 1223 struct inode *dir = &to->i_inode; 1224 struct super_block *sb = dir->i_sb; 1225 struct inode *tmp; 1226 int error = 0; 1227 1228 igrab(dir); 1229 1230 for (;;) { 1231 if (dir == &this->i_inode) { 1232 error = -EINVAL; 1233 break; 1234 } 1235 if (dir == sb->s_root->d_inode) { 1236 error = 0; 1237 break; 1238 } 1239 1240 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1); 1241 if (IS_ERR(tmp)) { 1242 error = PTR_ERR(tmp); 1243 break; 1244 } 1245 1246 iput(dir); 1247 dir = tmp; 1248 } 1249 1250 iput(dir); 1251 1252 return error; 1253 } 1254 1255 /** 1256 * gfs2_rename - Rename a file 1257 * @odir: Parent directory of old file name 1258 * @odentry: The old dentry of the file 1259 * @ndir: Parent directory of new file name 1260 * @ndentry: The new dentry of the file 1261 * 1262 * Returns: errno 1263 */ 1264 1265 static int gfs2_rename(struct inode *odir, struct dentry *odentry, 1266 struct inode *ndir, struct dentry *ndentry) 1267 { 1268 struct gfs2_inode *odip = GFS2_I(odir); 1269 struct gfs2_inode *ndip = GFS2_I(ndir); 1270 struct gfs2_inode *ip = GFS2_I(odentry->d_inode); 1271 struct gfs2_inode *nip = NULL; 1272 struct gfs2_sbd *sdp = GFS2_SB(odir); 1273 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, }; 1274 struct gfs2_rgrpd *nrgd; 1275 unsigned int num_gh; 1276 int dir_rename = 0; 1277 int alloc_required = 0; 1278 unsigned int x; 1279 int error; 1280 1281 if (ndentry->d_inode) { 1282 nip = GFS2_I(ndentry->d_inode); 1283 if (ip == nip) 1284 return 0; 1285 } 1286 1287 error = gfs2_rindex_update(sdp); 1288 if (error) 1289 return error; 1290 1291 error = gfs2_rs_alloc(ndip); 1292 if (error) 1293 return error; 1294 1295 if (odip != ndip) { 1296 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 1297 0, &r_gh); 1298 if (error) 1299 goto out; 1300 1301 if (S_ISDIR(ip->i_inode.i_mode)) { 1302 dir_rename = 1; 1303 /* don't move a dirctory into it's subdir */ 1304 error = gfs2_ok_to_move(ip, ndip); 1305 if (error) 1306 goto out_gunlock_r; 1307 } 1308 } 1309 1310 num_gh = 1; 1311 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); 1312 if (odip != ndip) { 1313 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1314 num_gh++; 1315 } 1316 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1317 num_gh++; 1318 1319 if (nip) { 1320 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); 1321 num_gh++; 1322 /* grab the resource lock for unlink flag twiddling 1323 * this is the case of the target file already existing 1324 * so we unlink before doing the rename 1325 */ 1326 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1); 1327 if (nrgd) 1328 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++); 1329 } 1330 1331 for (x = 0; x < num_gh; x++) { 1332 error = gfs2_glock_nq(ghs + x); 1333 if (error) 1334 goto out_gunlock; 1335 } 1336 1337 error = -ENOENT; 1338 if (ip->i_inode.i_nlink == 0) 1339 goto out_gunlock; 1340 1341 /* Check out the old directory */ 1342 1343 error = gfs2_unlink_ok(odip, &odentry->d_name, ip); 1344 if (error) 1345 goto out_gunlock; 1346 1347 /* Check out the new directory */ 1348 1349 if (nip) { 1350 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); 1351 if (error) 1352 goto out_gunlock; 1353 1354 if (nip->i_inode.i_nlink == 0) { 1355 error = -EAGAIN; 1356 goto out_gunlock; 1357 } 1358 1359 if (S_ISDIR(nip->i_inode.i_mode)) { 1360 if (nip->i_entries < 2) { 1361 gfs2_consist_inode(nip); 1362 error = -EIO; 1363 goto out_gunlock; 1364 } 1365 if (nip->i_entries > 2) { 1366 error = -ENOTEMPTY; 1367 goto out_gunlock; 1368 } 1369 } 1370 } else { 1371 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC); 1372 if (error) 1373 goto out_gunlock; 1374 1375 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL); 1376 switch (error) { 1377 case -ENOENT: 1378 error = 0; 1379 break; 1380 case 0: 1381 error = -EEXIST; 1382 default: 1383 goto out_gunlock; 1384 }; 1385 1386 if (odip != ndip) { 1387 if (!ndip->i_inode.i_nlink) { 1388 error = -ENOENT; 1389 goto out_gunlock; 1390 } 1391 if (ndip->i_entries == (u32)-1) { 1392 error = -EFBIG; 1393 goto out_gunlock; 1394 } 1395 if (S_ISDIR(ip->i_inode.i_mode) && 1396 ndip->i_inode.i_nlink == (u32)-1) { 1397 error = -EMLINK; 1398 goto out_gunlock; 1399 } 1400 } 1401 } 1402 1403 /* Check out the dir to be renamed */ 1404 1405 if (dir_rename) { 1406 error = gfs2_permission(odentry->d_inode, MAY_WRITE); 1407 if (error) 1408 goto out_gunlock; 1409 } 1410 1411 if (nip == NULL) 1412 alloc_required = gfs2_diradd_alloc_required(ndir, &ndentry->d_name); 1413 error = alloc_required; 1414 if (error < 0) 1415 goto out_gunlock; 1416 1417 if (alloc_required) { 1418 struct gfs2_alloc_parms ap = { .target = sdp->sd_max_dirres, }; 1419 error = gfs2_quota_lock_check(ndip); 1420 if (error) 1421 goto out_gunlock; 1422 1423 error = gfs2_inplace_reserve(ndip, &ap); 1424 if (error) 1425 goto out_gunlock_q; 1426 1427 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + 1428 gfs2_rg_blocks(ndip, sdp->sd_max_dirres) + 1429 4 * RES_DINODE + 4 * RES_LEAF + 1430 RES_STATFS + RES_QUOTA + 4, 0); 1431 if (error) 1432 goto out_ipreserv; 1433 } else { 1434 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 1435 5 * RES_LEAF + 4, 0); 1436 if (error) 1437 goto out_gunlock; 1438 } 1439 1440 /* Remove the target file, if it exists */ 1441 1442 if (nip) 1443 error = gfs2_unlink_inode(ndip, ndentry); 1444 1445 if (dir_rename) { 1446 error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR); 1447 if (error) 1448 goto out_end_trans; 1449 } else { 1450 struct buffer_head *dibh; 1451 error = gfs2_meta_inode_buffer(ip, &dibh); 1452 if (error) 1453 goto out_end_trans; 1454 ip->i_inode.i_ctime = CURRENT_TIME; 1455 gfs2_trans_add_meta(ip->i_gl, dibh); 1456 gfs2_dinode_out(ip, dibh->b_data); 1457 brelse(dibh); 1458 } 1459 1460 error = gfs2_dir_del(odip, odentry); 1461 if (error) 1462 goto out_end_trans; 1463 1464 error = gfs2_dir_add(ndir, &ndentry->d_name, ip); 1465 if (error) 1466 goto out_end_trans; 1467 1468 out_end_trans: 1469 gfs2_trans_end(sdp); 1470 out_ipreserv: 1471 if (alloc_required) 1472 gfs2_inplace_release(ndip); 1473 out_gunlock_q: 1474 if (alloc_required) 1475 gfs2_quota_unlock(ndip); 1476 out_gunlock: 1477 while (x--) { 1478 gfs2_glock_dq(ghs + x); 1479 gfs2_holder_uninit(ghs + x); 1480 } 1481 out_gunlock_r: 1482 if (r_gh.gh_gl) 1483 gfs2_glock_dq_uninit(&r_gh); 1484 out: 1485 return error; 1486 } 1487 1488 /** 1489 * gfs2_follow_link - Follow a symbolic link 1490 * @dentry: The dentry of the link 1491 * @nd: Data that we pass to vfs_follow_link() 1492 * 1493 * This can handle symlinks of any size. 1494 * 1495 * Returns: 0 on success or error code 1496 */ 1497 1498 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd) 1499 { 1500 struct gfs2_inode *ip = GFS2_I(dentry->d_inode); 1501 struct gfs2_holder i_gh; 1502 struct buffer_head *dibh; 1503 unsigned int size; 1504 char *buf; 1505 int error; 1506 1507 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); 1508 error = gfs2_glock_nq(&i_gh); 1509 if (error) { 1510 gfs2_holder_uninit(&i_gh); 1511 nd_set_link(nd, ERR_PTR(error)); 1512 return NULL; 1513 } 1514 1515 size = (unsigned int)i_size_read(&ip->i_inode); 1516 if (size == 0) { 1517 gfs2_consist_inode(ip); 1518 buf = ERR_PTR(-EIO); 1519 goto out; 1520 } 1521 1522 error = gfs2_meta_inode_buffer(ip, &dibh); 1523 if (error) { 1524 buf = ERR_PTR(error); 1525 goto out; 1526 } 1527 1528 buf = kzalloc(size + 1, GFP_NOFS); 1529 if (!buf) 1530 buf = ERR_PTR(-ENOMEM); 1531 else 1532 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size); 1533 brelse(dibh); 1534 out: 1535 gfs2_glock_dq_uninit(&i_gh); 1536 nd_set_link(nd, buf); 1537 return NULL; 1538 } 1539 1540 /** 1541 * gfs2_permission - 1542 * @inode: The inode 1543 * @mask: The mask to be tested 1544 * @flags: Indicates whether this is an RCU path walk or not 1545 * 1546 * This may be called from the VFS directly, or from within GFS2 with the 1547 * inode locked, so we look to see if the glock is already locked and only 1548 * lock the glock if its not already been done. 1549 * 1550 * Returns: errno 1551 */ 1552 1553 int gfs2_permission(struct inode *inode, int mask) 1554 { 1555 struct gfs2_inode *ip; 1556 struct gfs2_holder i_gh; 1557 int error; 1558 int unlock = 0; 1559 1560 1561 ip = GFS2_I(inode); 1562 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 1563 if (mask & MAY_NOT_BLOCK) 1564 return -ECHILD; 1565 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); 1566 if (error) 1567 return error; 1568 unlock = 1; 1569 } 1570 1571 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode)) 1572 error = -EACCES; 1573 else 1574 error = generic_permission(inode, mask); 1575 if (unlock) 1576 gfs2_glock_dq_uninit(&i_gh); 1577 1578 return error; 1579 } 1580 1581 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1582 { 1583 setattr_copy(inode, attr); 1584 mark_inode_dirty(inode); 1585 return 0; 1586 } 1587 1588 /** 1589 * gfs2_setattr_simple - 1590 * @ip: 1591 * @attr: 1592 * 1593 * Returns: errno 1594 */ 1595 1596 int gfs2_setattr_simple(struct inode *inode, struct iattr *attr) 1597 { 1598 int error; 1599 1600 if (current->journal_info) 1601 return __gfs2_setattr_simple(inode, attr); 1602 1603 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0); 1604 if (error) 1605 return error; 1606 1607 error = __gfs2_setattr_simple(inode, attr); 1608 gfs2_trans_end(GFS2_SB(inode)); 1609 return error; 1610 } 1611 1612 static int setattr_chown(struct inode *inode, struct iattr *attr) 1613 { 1614 struct gfs2_inode *ip = GFS2_I(inode); 1615 struct gfs2_sbd *sdp = GFS2_SB(inode); 1616 kuid_t ouid, nuid; 1617 kgid_t ogid, ngid; 1618 int error; 1619 1620 ouid = inode->i_uid; 1621 ogid = inode->i_gid; 1622 nuid = attr->ia_uid; 1623 ngid = attr->ia_gid; 1624 1625 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid)) 1626 ouid = nuid = NO_UID_QUOTA_CHANGE; 1627 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid)) 1628 ogid = ngid = NO_GID_QUOTA_CHANGE; 1629 1630 error = gfs2_quota_lock(ip, nuid, ngid); 1631 if (error) 1632 return error; 1633 1634 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 1635 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 1636 error = gfs2_quota_check(ip, nuid, ngid); 1637 if (error) 1638 goto out_gunlock_q; 1639 } 1640 1641 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0); 1642 if (error) 1643 goto out_gunlock_q; 1644 1645 error = gfs2_setattr_simple(inode, attr); 1646 if (error) 1647 goto out_end_trans; 1648 1649 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || 1650 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { 1651 u64 blocks = gfs2_get_inode_blocks(&ip->i_inode); 1652 gfs2_quota_change(ip, -blocks, ouid, ogid); 1653 gfs2_quota_change(ip, blocks, nuid, ngid); 1654 } 1655 1656 out_end_trans: 1657 gfs2_trans_end(sdp); 1658 out_gunlock_q: 1659 gfs2_quota_unlock(ip); 1660 return error; 1661 } 1662 1663 /** 1664 * gfs2_setattr - Change attributes on an inode 1665 * @dentry: The dentry which is changing 1666 * @attr: The structure describing the change 1667 * 1668 * The VFS layer wants to change one or more of an inodes attributes. Write 1669 * that change out to disk. 1670 * 1671 * Returns: errno 1672 */ 1673 1674 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr) 1675 { 1676 struct inode *inode = dentry->d_inode; 1677 struct gfs2_inode *ip = GFS2_I(inode); 1678 struct gfs2_holder i_gh; 1679 int error; 1680 1681 error = gfs2_rs_alloc(ip); 1682 if (error) 1683 return error; 1684 1685 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); 1686 if (error) 1687 return error; 1688 1689 error = -EPERM; 1690 if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) 1691 goto out; 1692 1693 error = inode_change_ok(inode, attr); 1694 if (error) 1695 goto out; 1696 1697 if (attr->ia_valid & ATTR_SIZE) 1698 error = gfs2_setattr_size(inode, attr->ia_size); 1699 else if (attr->ia_valid & (ATTR_UID | ATTR_GID)) 1700 error = setattr_chown(inode, attr); 1701 else { 1702 error = gfs2_setattr_simple(inode, attr); 1703 if (!error && attr->ia_valid & ATTR_MODE) 1704 error = posix_acl_chmod(inode, inode->i_mode); 1705 } 1706 1707 out: 1708 if (!error) 1709 mark_inode_dirty(inode); 1710 gfs2_glock_dq_uninit(&i_gh); 1711 return error; 1712 } 1713 1714 /** 1715 * gfs2_getattr - Read out an inode's attributes 1716 * @mnt: The vfsmount the inode is being accessed from 1717 * @dentry: The dentry to stat 1718 * @stat: The inode's stats 1719 * 1720 * This may be called from the VFS directly, or from within GFS2 with the 1721 * inode locked, so we look to see if the glock is already locked and only 1722 * lock the glock if its not already been done. Note that its the NFS 1723 * readdirplus operation which causes this to be called (from filldir) 1724 * with the glock already held. 1725 * 1726 * Returns: errno 1727 */ 1728 1729 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry, 1730 struct kstat *stat) 1731 { 1732 struct inode *inode = dentry->d_inode; 1733 struct gfs2_inode *ip = GFS2_I(inode); 1734 struct gfs2_holder gh; 1735 int error; 1736 int unlock = 0; 1737 1738 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { 1739 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 1740 if (error) 1741 return error; 1742 unlock = 1; 1743 } 1744 1745 generic_fillattr(inode, stat); 1746 if (unlock) 1747 gfs2_glock_dq_uninit(&gh); 1748 1749 return 0; 1750 } 1751 1752 static int gfs2_setxattr(struct dentry *dentry, const char *name, 1753 const void *data, size_t size, int flags) 1754 { 1755 struct inode *inode = dentry->d_inode; 1756 struct gfs2_inode *ip = GFS2_I(inode); 1757 struct gfs2_holder gh; 1758 int ret; 1759 1760 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 1761 ret = gfs2_glock_nq(&gh); 1762 if (ret == 0) { 1763 ret = gfs2_rs_alloc(ip); 1764 if (ret == 0) 1765 ret = generic_setxattr(dentry, name, data, size, flags); 1766 gfs2_glock_dq(&gh); 1767 } 1768 gfs2_holder_uninit(&gh); 1769 return ret; 1770 } 1771 1772 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name, 1773 void *data, size_t size) 1774 { 1775 struct inode *inode = dentry->d_inode; 1776 struct gfs2_inode *ip = GFS2_I(inode); 1777 struct gfs2_holder gh; 1778 int ret; 1779 1780 /* For selinux during lookup */ 1781 if (gfs2_glock_is_locked_by_me(ip->i_gl)) 1782 return generic_getxattr(dentry, name, data, size); 1783 1784 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); 1785 ret = gfs2_glock_nq(&gh); 1786 if (ret == 0) { 1787 ret = generic_getxattr(dentry, name, data, size); 1788 gfs2_glock_dq(&gh); 1789 } 1790 gfs2_holder_uninit(&gh); 1791 return ret; 1792 } 1793 1794 static int gfs2_removexattr(struct dentry *dentry, const char *name) 1795 { 1796 struct inode *inode = dentry->d_inode; 1797 struct gfs2_inode *ip = GFS2_I(inode); 1798 struct gfs2_holder gh; 1799 int ret; 1800 1801 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 1802 ret = gfs2_glock_nq(&gh); 1803 if (ret == 0) { 1804 ret = gfs2_rs_alloc(ip); 1805 if (ret == 0) 1806 ret = generic_removexattr(dentry, name); 1807 gfs2_glock_dq(&gh); 1808 } 1809 gfs2_holder_uninit(&gh); 1810 return ret; 1811 } 1812 1813 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 1814 u64 start, u64 len) 1815 { 1816 struct gfs2_inode *ip = GFS2_I(inode); 1817 struct gfs2_holder gh; 1818 int ret; 1819 1820 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC); 1821 if (ret) 1822 return ret; 1823 1824 mutex_lock(&inode->i_mutex); 1825 1826 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 1827 if (ret) 1828 goto out; 1829 1830 if (gfs2_is_stuffed(ip)) { 1831 u64 phys = ip->i_no_addr << inode->i_blkbits; 1832 u64 size = i_size_read(inode); 1833 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED| 1834 FIEMAP_EXTENT_DATA_INLINE; 1835 phys += sizeof(struct gfs2_dinode); 1836 phys += start; 1837 if (start + len > size) 1838 len = size - start; 1839 if (start < size) 1840 ret = fiemap_fill_next_extent(fieinfo, start, phys, 1841 len, flags); 1842 if (ret == 1) 1843 ret = 0; 1844 } else { 1845 ret = __generic_block_fiemap(inode, fieinfo, start, len, 1846 gfs2_block_map); 1847 } 1848 1849 gfs2_glock_dq_uninit(&gh); 1850 out: 1851 mutex_unlock(&inode->i_mutex); 1852 return ret; 1853 } 1854 1855 const struct inode_operations gfs2_file_iops = { 1856 .permission = gfs2_permission, 1857 .setattr = gfs2_setattr, 1858 .getattr = gfs2_getattr, 1859 .setxattr = gfs2_setxattr, 1860 .getxattr = gfs2_getxattr, 1861 .listxattr = gfs2_listxattr, 1862 .removexattr = gfs2_removexattr, 1863 .fiemap = gfs2_fiemap, 1864 .get_acl = gfs2_get_acl, 1865 .set_acl = gfs2_set_acl, 1866 }; 1867 1868 const struct inode_operations gfs2_dir_iops = { 1869 .create = gfs2_create, 1870 .lookup = gfs2_lookup, 1871 .link = gfs2_link, 1872 .unlink = gfs2_unlink, 1873 .symlink = gfs2_symlink, 1874 .mkdir = gfs2_mkdir, 1875 .rmdir = gfs2_unlink, 1876 .mknod = gfs2_mknod, 1877 .rename = gfs2_rename, 1878 .permission = gfs2_permission, 1879 .setattr = gfs2_setattr, 1880 .getattr = gfs2_getattr, 1881 .setxattr = gfs2_setxattr, 1882 .getxattr = gfs2_getxattr, 1883 .listxattr = gfs2_listxattr, 1884 .removexattr = gfs2_removexattr, 1885 .fiemap = gfs2_fiemap, 1886 .get_acl = gfs2_get_acl, 1887 .set_acl = gfs2_set_acl, 1888 .atomic_open = gfs2_atomic_open, 1889 }; 1890 1891 const struct inode_operations gfs2_symlink_iops = { 1892 .readlink = generic_readlink, 1893 .follow_link = gfs2_follow_link, 1894 .put_link = kfree_put_link, 1895 .permission = gfs2_permission, 1896 .setattr = gfs2_setattr, 1897 .getattr = gfs2_getattr, 1898 .setxattr = gfs2_setxattr, 1899 .getxattr = gfs2_getxattr, 1900 .listxattr = gfs2_listxattr, 1901 .removexattr = gfs2_removexattr, 1902 .fiemap = gfs2_fiemap, 1903 }; 1904 1905