| 1 | // SPDX-License-Identifier: GPL-2.0-only |
| 2 | /* |
| 3 | * |
| 4 | * Copyright (C) 2011 Novell Inc. |
| 5 | */ |
| 6 | |
| 7 | #include <linux/module.h> |
| 8 | #include <linux/fs.h> |
| 9 | #include <linux/slab.h> |
| 10 | #include <linux/file.h> |
| 11 | #include <linux/fileattr.h> |
| 12 | #include <linux/splice.h> |
| 13 | #include <linux/xattr.h> |
| 14 | #include <linux/security.h> |
| 15 | #include <linux/uaccess.h> |
| 16 | #include <linux/sched/signal.h> |
| 17 | #include <linux/cred.h> |
| 18 | #include <linux/namei.h> |
| 19 | #include <linux/fdtable.h> |
| 20 | #include <linux/ratelimit.h> |
| 21 | #include <linux/exportfs.h> |
| 22 | #include "overlayfs.h" |
| 23 | |
| 24 | #define OVL_COPY_UP_CHUNK_SIZE (1 << 20) |
| 25 | |
| 26 | static int ovl_ccup_set(const char *buf, const struct kernel_param *param) |
| 27 | { |
| 28 | pr_warn("\"check_copy_up\" module option is obsolete\n"); |
| 29 | return 0; |
| 30 | } |
| 31 | |
| 32 | static int ovl_ccup_get(char *buf, const struct kernel_param *param) |
| 33 | { |
| 34 | return sprintf(buf, "N\n"); |
| 35 | } |
| 36 | |
| 37 | module_param_call(check_copy_up, ovl_ccup_set, ovl_ccup_get, NULL, 0644); |
| 38 | MODULE_PARM_DESC(check_copy_up, "Obsolete; does nothing"); |
| 39 | |
| 40 | static bool ovl_must_copy_xattr(const char *name) |
| 41 | { |
| 42 | return !strcmp(name, XATTR_POSIX_ACL_ACCESS) || |
| 43 | !strcmp(name, XATTR_POSIX_ACL_DEFAULT) || |
| 44 | !strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN); |
| 45 | } |
| 46 | |
| 47 | static int ovl_copy_acl(struct ovl_fs *ofs, const struct path *path, |
| 48 | struct dentry *dentry, const char *acl_name) |
| 49 | { |
| 50 | int err; |
| 51 | struct posix_acl *clone, *real_acl = NULL; |
| 52 | |
| 53 | real_acl = ovl_get_acl_path(path, acl_name, false); |
| 54 | if (!real_acl) |
| 55 | return 0; |
| 56 | |
| 57 | if (IS_ERR(real_acl)) { |
| 58 | err = PTR_ERR(real_acl); |
| 59 | if (err == -ENODATA || err == -EOPNOTSUPP) |
| 60 | return 0; |
| 61 | return err; |
| 62 | } |
| 63 | |
| 64 | clone = posix_acl_clone(real_acl, GFP_KERNEL); |
| 65 | posix_acl_release(real_acl); /* release original acl */ |
| 66 | if (!clone) |
| 67 | return -ENOMEM; |
| 68 | |
| 69 | err = ovl_do_set_acl(ofs, dentry, acl_name, clone); |
| 70 | |
| 71 | /* release cloned acl */ |
| 72 | posix_acl_release(clone); |
| 73 | return err; |
| 74 | } |
| 75 | |
| 76 | int ovl_copy_xattr(struct super_block *sb, const struct path *oldpath, struct dentry *new) |
| 77 | { |
| 78 | struct dentry *old = oldpath->dentry; |
| 79 | ssize_t list_size, size, value_size = 0; |
| 80 | char *buf, *name, *value = NULL; |
| 81 | int error = 0; |
| 82 | size_t slen; |
| 83 | |
| 84 | if (!old->d_inode->i_op->listxattr || !new->d_inode->i_op->listxattr) |
| 85 | return 0; |
| 86 | |
| 87 | list_size = vfs_listxattr(old, NULL, 0); |
| 88 | if (list_size <= 0) { |
| 89 | if (list_size == -EOPNOTSUPP) |
| 90 | return 0; |
| 91 | return list_size; |
| 92 | } |
| 93 | |
| 94 | buf = kvzalloc(list_size, GFP_KERNEL); |
| 95 | if (!buf) |
| 96 | return -ENOMEM; |
| 97 | |
| 98 | list_size = vfs_listxattr(old, buf, list_size); |
| 99 | if (list_size <= 0) { |
| 100 | error = list_size; |
| 101 | goto out; |
| 102 | } |
| 103 | |
| 104 | for (name = buf; list_size; name += slen) { |
| 105 | slen = strnlen(name, list_size) + 1; |
| 106 | |
| 107 | /* underlying fs providing us with an broken xattr list? */ |
| 108 | if (WARN_ON(slen > list_size)) { |
| 109 | error = -EIO; |
| 110 | break; |
| 111 | } |
| 112 | list_size -= slen; |
| 113 | |
| 114 | if (ovl_is_private_xattr(sb, name)) |
| 115 | continue; |
| 116 | |
| 117 | error = security_inode_copy_up_xattr(name); |
| 118 | if (error < 0 && error != -EOPNOTSUPP) |
| 119 | break; |
| 120 | if (error == 1) { |
| 121 | error = 0; |
| 122 | continue; /* Discard */ |
| 123 | } |
| 124 | |
| 125 | if (is_posix_acl_xattr(name)) { |
| 126 | error = ovl_copy_acl(OVL_FS(sb), oldpath, new, name); |
| 127 | if (!error) |
| 128 | continue; |
| 129 | /* POSIX ACLs must be copied. */ |
| 130 | break; |
| 131 | } |
| 132 | |
| 133 | retry: |
| 134 | size = ovl_do_getxattr(oldpath, name, value, value_size); |
| 135 | if (size == -ERANGE) |
| 136 | size = ovl_do_getxattr(oldpath, name, NULL, 0); |
| 137 | |
| 138 | if (size < 0) { |
| 139 | error = size; |
| 140 | break; |
| 141 | } |
| 142 | |
| 143 | if (size > value_size) { |
| 144 | void *new; |
| 145 | |
| 146 | new = kvmalloc(size, GFP_KERNEL); |
| 147 | if (!new) { |
| 148 | error = -ENOMEM; |
| 149 | break; |
| 150 | } |
| 151 | kvfree(value); |
| 152 | value = new; |
| 153 | value_size = size; |
| 154 | goto retry; |
| 155 | } |
| 156 | |
| 157 | error = ovl_do_setxattr(OVL_FS(sb), new, name, value, size, 0); |
| 158 | if (error) { |
| 159 | if (error != -EOPNOTSUPP || ovl_must_copy_xattr(name)) |
| 160 | break; |
| 161 | |
| 162 | /* Ignore failure to copy unknown xattrs */ |
| 163 | error = 0; |
| 164 | } |
| 165 | } |
| 166 | kvfree(value); |
| 167 | out: |
| 168 | kvfree(buf); |
| 169 | return error; |
| 170 | } |
| 171 | |
| 172 | static int ovl_copy_fileattr(struct inode *inode, const struct path *old, |
| 173 | const struct path *new) |
| 174 | { |
| 175 | struct fileattr oldfa = { .flags_valid = true }; |
| 176 | struct fileattr newfa = { .flags_valid = true }; |
| 177 | int err; |
| 178 | |
| 179 | err = ovl_real_fileattr_get(old, &oldfa); |
| 180 | if (err) { |
| 181 | /* Ntfs-3g returns -EINVAL for "no fileattr support" */ |
| 182 | if (err == -ENOTTY || err == -EINVAL) |
| 183 | return 0; |
| 184 | pr_warn("failed to retrieve lower fileattr (%pd2, err=%i)\n", |
| 185 | old->dentry, err); |
| 186 | return err; |
| 187 | } |
| 188 | |
| 189 | /* |
| 190 | * We cannot set immutable and append-only flags on upper inode, |
| 191 | * because we would not be able to link upper inode to upper dir |
| 192 | * not set overlay private xattr on upper inode. |
| 193 | * Store these flags in overlay.protattr xattr instead. |
| 194 | */ |
| 195 | if (oldfa.flags & OVL_PROT_FS_FLAGS_MASK) { |
| 196 | err = ovl_set_protattr(inode, new->dentry, &oldfa); |
| 197 | if (err == -EPERM) |
| 198 | pr_warn_once("copying fileattr: no xattr on upper\n"); |
| 199 | else if (err) |
| 200 | return err; |
| 201 | } |
| 202 | |
| 203 | /* Don't bother copying flags if none are set */ |
| 204 | if (!(oldfa.flags & OVL_COPY_FS_FLAGS_MASK)) |
| 205 | return 0; |
| 206 | |
| 207 | err = ovl_real_fileattr_get(new, &newfa); |
| 208 | if (err) { |
| 209 | /* |
| 210 | * Returning an error if upper doesn't support fileattr will |
| 211 | * result in a regression, so revert to the old behavior. |
| 212 | */ |
| 213 | if (err == -ENOTTY || err == -EINVAL) { |
| 214 | pr_warn_once("copying fileattr: no support on upper\n"); |
| 215 | return 0; |
| 216 | } |
| 217 | pr_warn("failed to retrieve upper fileattr (%pd2, err=%i)\n", |
| 218 | new->dentry, err); |
| 219 | return err; |
| 220 | } |
| 221 | |
| 222 | BUILD_BUG_ON(OVL_COPY_FS_FLAGS_MASK & ~FS_COMMON_FL); |
| 223 | newfa.flags &= ~OVL_COPY_FS_FLAGS_MASK; |
| 224 | newfa.flags |= (oldfa.flags & OVL_COPY_FS_FLAGS_MASK); |
| 225 | |
| 226 | BUILD_BUG_ON(OVL_COPY_FSX_FLAGS_MASK & ~FS_XFLAG_COMMON); |
| 227 | newfa.fsx_xflags &= ~OVL_COPY_FSX_FLAGS_MASK; |
| 228 | newfa.fsx_xflags |= (oldfa.fsx_xflags & OVL_COPY_FSX_FLAGS_MASK); |
| 229 | |
| 230 | return ovl_real_fileattr_set(new, &newfa); |
| 231 | } |
| 232 | |
| 233 | static int ovl_copy_up_file(struct ovl_fs *ofs, struct dentry *dentry, |
| 234 | struct file *new_file, loff_t len) |
| 235 | { |
| 236 | struct path datapath; |
| 237 | struct file *old_file; |
| 238 | loff_t old_pos = 0; |
| 239 | loff_t new_pos = 0; |
| 240 | loff_t cloned; |
| 241 | loff_t data_pos = -1; |
| 242 | loff_t hole_len; |
| 243 | bool skip_hole = false; |
| 244 | int error = 0; |
| 245 | |
| 246 | ovl_path_lowerdata(dentry, &datapath); |
| 247 | if (WARN_ON(datapath.dentry == NULL)) |
| 248 | return -EIO; |
| 249 | |
| 250 | old_file = ovl_path_open(&datapath, O_LARGEFILE | O_RDONLY); |
| 251 | if (IS_ERR(old_file)) |
| 252 | return PTR_ERR(old_file); |
| 253 | |
| 254 | /* Try to use clone_file_range to clone up within the same fs */ |
| 255 | cloned = do_clone_file_range(old_file, 0, new_file, 0, len, 0); |
| 256 | if (cloned == len) |
| 257 | goto out_fput; |
| 258 | /* Couldn't clone, so now we try to copy the data */ |
| 259 | |
| 260 | /* Check if lower fs supports seek operation */ |
| 261 | if (old_file->f_mode & FMODE_LSEEK) |
| 262 | skip_hole = true; |
| 263 | |
| 264 | while (len) { |
| 265 | size_t this_len = OVL_COPY_UP_CHUNK_SIZE; |
| 266 | long bytes; |
| 267 | |
| 268 | if (len < this_len) |
| 269 | this_len = len; |
| 270 | |
| 271 | if (signal_pending_state(TASK_KILLABLE, current)) { |
| 272 | error = -EINTR; |
| 273 | break; |
| 274 | } |
| 275 | |
| 276 | /* |
| 277 | * Fill zero for hole will cost unnecessary disk space |
| 278 | * and meanwhile slow down the copy-up speed, so we do |
| 279 | * an optimization for hole during copy-up, it relies |
| 280 | * on SEEK_DATA implementation in lower fs so if lower |
| 281 | * fs does not support it, copy-up will behave as before. |
| 282 | * |
| 283 | * Detail logic of hole detection as below: |
| 284 | * When we detect next data position is larger than current |
| 285 | * position we will skip that hole, otherwise we copy |
| 286 | * data in the size of OVL_COPY_UP_CHUNK_SIZE. Actually, |
| 287 | * it may not recognize all kind of holes and sometimes |
| 288 | * only skips partial of hole area. However, it will be |
| 289 | * enough for most of the use cases. |
| 290 | */ |
| 291 | |
| 292 | if (skip_hole && data_pos < old_pos) { |
| 293 | data_pos = vfs_llseek(old_file, old_pos, SEEK_DATA); |
| 294 | if (data_pos > old_pos) { |
| 295 | hole_len = data_pos - old_pos; |
| 296 | len -= hole_len; |
| 297 | old_pos = new_pos = data_pos; |
| 298 | continue; |
| 299 | } else if (data_pos == -ENXIO) { |
| 300 | break; |
| 301 | } else if (data_pos < 0) { |
| 302 | skip_hole = false; |
| 303 | } |
| 304 | } |
| 305 | |
| 306 | bytes = do_splice_direct(old_file, &old_pos, |
| 307 | new_file, &new_pos, |
| 308 | this_len, SPLICE_F_MOVE); |
| 309 | if (bytes <= 0) { |
| 310 | error = bytes; |
| 311 | break; |
| 312 | } |
| 313 | WARN_ON(old_pos != new_pos); |
| 314 | |
| 315 | len -= bytes; |
| 316 | } |
| 317 | if (!error && ovl_should_sync(ofs)) |
| 318 | error = vfs_fsync(new_file, 0); |
| 319 | out_fput: |
| 320 | fput(old_file); |
| 321 | return error; |
| 322 | } |
| 323 | |
| 324 | static int ovl_set_size(struct ovl_fs *ofs, |
| 325 | struct dentry *upperdentry, struct kstat *stat) |
| 326 | { |
| 327 | struct iattr attr = { |
| 328 | .ia_valid = ATTR_SIZE, |
| 329 | .ia_size = stat->size, |
| 330 | }; |
| 331 | |
| 332 | return ovl_do_notify_change(ofs, upperdentry, &attr); |
| 333 | } |
| 334 | |
| 335 | static int ovl_set_timestamps(struct ovl_fs *ofs, struct dentry *upperdentry, |
| 336 | struct kstat *stat) |
| 337 | { |
| 338 | struct iattr attr = { |
| 339 | .ia_valid = |
| 340 | ATTR_ATIME | ATTR_MTIME | ATTR_ATIME_SET | ATTR_MTIME_SET, |
| 341 | .ia_atime = stat->atime, |
| 342 | .ia_mtime = stat->mtime, |
| 343 | }; |
| 344 | |
| 345 | return ovl_do_notify_change(ofs, upperdentry, &attr); |
| 346 | } |
| 347 | |
| 348 | int ovl_set_attr(struct ovl_fs *ofs, struct dentry *upperdentry, |
| 349 | struct kstat *stat) |
| 350 | { |
| 351 | int err = 0; |
| 352 | |
| 353 | if (!S_ISLNK(stat->mode)) { |
| 354 | struct iattr attr = { |
| 355 | .ia_valid = ATTR_MODE, |
| 356 | .ia_mode = stat->mode, |
| 357 | }; |
| 358 | err = ovl_do_notify_change(ofs, upperdentry, &attr); |
| 359 | } |
| 360 | if (!err) { |
| 361 | struct iattr attr = { |
| 362 | .ia_valid = ATTR_UID | ATTR_GID, |
| 363 | .ia_vfsuid = VFSUIDT_INIT(stat->uid), |
| 364 | .ia_vfsgid = VFSGIDT_INIT(stat->gid), |
| 365 | }; |
| 366 | err = ovl_do_notify_change(ofs, upperdentry, &attr); |
| 367 | } |
| 368 | if (!err) |
| 369 | ovl_set_timestamps(ofs, upperdentry, stat); |
| 370 | |
| 371 | return err; |
| 372 | } |
| 373 | |
| 374 | struct ovl_fh *ovl_encode_real_fh(struct ovl_fs *ofs, struct dentry *real, |
| 375 | bool is_upper) |
| 376 | { |
| 377 | struct ovl_fh *fh; |
| 378 | int fh_type, dwords; |
| 379 | int buflen = MAX_HANDLE_SZ; |
| 380 | uuid_t *uuid = &real->d_sb->s_uuid; |
| 381 | int err; |
| 382 | |
| 383 | /* Make sure the real fid stays 32bit aligned */ |
| 384 | BUILD_BUG_ON(OVL_FH_FID_OFFSET % 4); |
| 385 | BUILD_BUG_ON(MAX_HANDLE_SZ + OVL_FH_FID_OFFSET > 255); |
| 386 | |
| 387 | fh = kzalloc(buflen + OVL_FH_FID_OFFSET, GFP_KERNEL); |
| 388 | if (!fh) |
| 389 | return ERR_PTR(-ENOMEM); |
| 390 | |
| 391 | /* |
| 392 | * We encode a non-connectable file handle for non-dir, because we |
| 393 | * only need to find the lower inode number and we don't want to pay |
| 394 | * the price or reconnecting the dentry. |
| 395 | */ |
| 396 | dwords = buflen >> 2; |
| 397 | fh_type = exportfs_encode_fh(real, (void *)fh->fb.fid, &dwords, 0); |
| 398 | buflen = (dwords << 2); |
| 399 | |
| 400 | err = -EIO; |
| 401 | if (WARN_ON(fh_type < 0) || |
| 402 | WARN_ON(buflen > MAX_HANDLE_SZ) || |
| 403 | WARN_ON(fh_type == FILEID_INVALID)) |
| 404 | goto out_err; |
| 405 | |
| 406 | fh->fb.version = OVL_FH_VERSION; |
| 407 | fh->fb.magic = OVL_FH_MAGIC; |
| 408 | fh->fb.type = fh_type; |
| 409 | fh->fb.flags = OVL_FH_FLAG_CPU_ENDIAN; |
| 410 | /* |
| 411 | * When we will want to decode an overlay dentry from this handle |
| 412 | * and all layers are on the same fs, if we get a disconncted real |
| 413 | * dentry when we decode fid, the only way to tell if we should assign |
| 414 | * it to upperdentry or to lowerstack is by checking this flag. |
| 415 | */ |
| 416 | if (is_upper) |
| 417 | fh->fb.flags |= OVL_FH_FLAG_PATH_UPPER; |
| 418 | fh->fb.len = sizeof(fh->fb) + buflen; |
| 419 | if (ofs->config.uuid) |
| 420 | fh->fb.uuid = *uuid; |
| 421 | |
| 422 | return fh; |
| 423 | |
| 424 | out_err: |
| 425 | kfree(fh); |
| 426 | return ERR_PTR(err); |
| 427 | } |
| 428 | |
| 429 | int ovl_set_origin(struct ovl_fs *ofs, struct dentry *lower, |
| 430 | struct dentry *upper) |
| 431 | { |
| 432 | const struct ovl_fh *fh = NULL; |
| 433 | int err; |
| 434 | |
| 435 | /* |
| 436 | * When lower layer doesn't support export operations store a 'null' fh, |
| 437 | * so we can use the overlay.origin xattr to distignuish between a copy |
| 438 | * up and a pure upper inode. |
| 439 | */ |
| 440 | if (ovl_can_decode_fh(lower->d_sb)) { |
| 441 | fh = ovl_encode_real_fh(ofs, lower, false); |
| 442 | if (IS_ERR(fh)) |
| 443 | return PTR_ERR(fh); |
| 444 | } |
| 445 | |
| 446 | /* |
| 447 | * Do not fail when upper doesn't support xattrs. |
| 448 | */ |
| 449 | err = ovl_check_setxattr(ofs, upper, OVL_XATTR_ORIGIN, fh->buf, |
| 450 | fh ? fh->fb.len : 0, 0); |
| 451 | kfree(fh); |
| 452 | |
| 453 | /* Ignore -EPERM from setting "user.*" on symlink/special */ |
| 454 | return err == -EPERM ? 0 : err; |
| 455 | } |
| 456 | |
| 457 | /* Store file handle of @upper dir in @index dir entry */ |
| 458 | static int ovl_set_upper_fh(struct ovl_fs *ofs, struct dentry *upper, |
| 459 | struct dentry *index) |
| 460 | { |
| 461 | const struct ovl_fh *fh; |
| 462 | int err; |
| 463 | |
| 464 | fh = ovl_encode_real_fh(ofs, upper, true); |
| 465 | if (IS_ERR(fh)) |
| 466 | return PTR_ERR(fh); |
| 467 | |
| 468 | err = ovl_setxattr(ofs, index, OVL_XATTR_UPPER, fh->buf, fh->fb.len); |
| 469 | |
| 470 | kfree(fh); |
| 471 | return err; |
| 472 | } |
| 473 | |
| 474 | /* |
| 475 | * Create and install index entry. |
| 476 | * |
| 477 | * Caller must hold i_mutex on indexdir. |
| 478 | */ |
| 479 | static int ovl_create_index(struct dentry *dentry, struct dentry *origin, |
| 480 | struct dentry *upper) |
| 481 | { |
| 482 | struct ovl_fs *ofs = OVL_FS(dentry->d_sb); |
| 483 | struct dentry *indexdir = ovl_indexdir(dentry->d_sb); |
| 484 | struct inode *dir = d_inode(indexdir); |
| 485 | struct dentry *index = NULL; |
| 486 | struct dentry *temp = NULL; |
| 487 | struct qstr name = { }; |
| 488 | int err; |
| 489 | |
| 490 | /* |
| 491 | * For now this is only used for creating index entry for directories, |
| 492 | * because non-dir are copied up directly to index and then hardlinked |
| 493 | * to upper dir. |
| 494 | * |
| 495 | * TODO: implement create index for non-dir, so we can call it when |
| 496 | * encoding file handle for non-dir in case index does not exist. |
| 497 | */ |
| 498 | if (WARN_ON(!d_is_dir(dentry))) |
| 499 | return -EIO; |
| 500 | |
| 501 | /* Directory not expected to be indexed before copy up */ |
| 502 | if (WARN_ON(ovl_test_flag(OVL_INDEX, d_inode(dentry)))) |
| 503 | return -EIO; |
| 504 | |
| 505 | err = ovl_get_index_name(ofs, origin, &name); |
| 506 | if (err) |
| 507 | return err; |
| 508 | |
| 509 | temp = ovl_create_temp(ofs, indexdir, OVL_CATTR(S_IFDIR | 0)); |
| 510 | err = PTR_ERR(temp); |
| 511 | if (IS_ERR(temp)) |
| 512 | goto free_name; |
| 513 | |
| 514 | err = ovl_set_upper_fh(ofs, upper, temp); |
| 515 | if (err) |
| 516 | goto out; |
| 517 | |
| 518 | index = ovl_lookup_upper(ofs, name.name, indexdir, name.len); |
| 519 | if (IS_ERR(index)) { |
| 520 | err = PTR_ERR(index); |
| 521 | } else { |
| 522 | err = ovl_do_rename(ofs, dir, temp, dir, index, 0); |
| 523 | dput(index); |
| 524 | } |
| 525 | out: |
| 526 | if (err) |
| 527 | ovl_cleanup(ofs, dir, temp); |
| 528 | dput(temp); |
| 529 | free_name: |
| 530 | kfree(name.name); |
| 531 | return err; |
| 532 | } |
| 533 | |
| 534 | struct ovl_copy_up_ctx { |
| 535 | struct dentry *parent; |
| 536 | struct dentry *dentry; |
| 537 | struct path lowerpath; |
| 538 | struct kstat stat; |
| 539 | struct kstat pstat; |
| 540 | const char *link; |
| 541 | struct dentry *destdir; |
| 542 | struct qstr destname; |
| 543 | struct dentry *workdir; |
| 544 | bool origin; |
| 545 | bool indexed; |
| 546 | bool metacopy; |
| 547 | }; |
| 548 | |
| 549 | static int ovl_link_up(struct ovl_copy_up_ctx *c) |
| 550 | { |
| 551 | int err; |
| 552 | struct dentry *upper; |
| 553 | struct dentry *upperdir = ovl_dentry_upper(c->parent); |
| 554 | struct ovl_fs *ofs = OVL_FS(c->dentry->d_sb); |
| 555 | struct inode *udir = d_inode(upperdir); |
| 556 | |
| 557 | /* Mark parent "impure" because it may now contain non-pure upper */ |
| 558 | err = ovl_set_impure(c->parent, upperdir); |
| 559 | if (err) |
| 560 | return err; |
| 561 | |
| 562 | err = ovl_set_nlink_lower(c->dentry); |
| 563 | if (err) |
| 564 | return err; |
| 565 | |
| 566 | inode_lock_nested(udir, I_MUTEX_PARENT); |
| 567 | upper = ovl_lookup_upper(ofs, c->dentry->d_name.name, upperdir, |
| 568 | c->dentry->d_name.len); |
| 569 | err = PTR_ERR(upper); |
| 570 | if (!IS_ERR(upper)) { |
| 571 | err = ovl_do_link(ofs, ovl_dentry_upper(c->dentry), udir, upper); |
| 572 | dput(upper); |
| 573 | |
| 574 | if (!err) { |
| 575 | /* Restore timestamps on parent (best effort) */ |
| 576 | ovl_set_timestamps(ofs, upperdir, &c->pstat); |
| 577 | ovl_dentry_set_upper_alias(c->dentry); |
| 578 | } |
| 579 | } |
| 580 | inode_unlock(udir); |
| 581 | if (err) |
| 582 | return err; |
| 583 | |
| 584 | err = ovl_set_nlink_upper(c->dentry); |
| 585 | |
| 586 | return err; |
| 587 | } |
| 588 | |
| 589 | static int ovl_copy_up_data(struct ovl_copy_up_ctx *c, const struct path *temp) |
| 590 | { |
| 591 | struct ovl_fs *ofs = OVL_FS(c->dentry->d_sb); |
| 592 | struct file *new_file; |
| 593 | int err; |
| 594 | |
| 595 | if (!S_ISREG(c->stat.mode) || c->metacopy || !c->stat.size) |
| 596 | return 0; |
| 597 | |
| 598 | new_file = ovl_path_open(temp, O_LARGEFILE | O_WRONLY); |
| 599 | if (IS_ERR(new_file)) |
| 600 | return PTR_ERR(new_file); |
| 601 | |
| 602 | err = ovl_copy_up_file(ofs, c->dentry, new_file, c->stat.size); |
| 603 | fput(new_file); |
| 604 | |
| 605 | return err; |
| 606 | } |
| 607 | |
| 608 | static int ovl_copy_up_metadata(struct ovl_copy_up_ctx *c, struct dentry *temp) |
| 609 | { |
| 610 | struct ovl_fs *ofs = OVL_FS(c->dentry->d_sb); |
| 611 | struct inode *inode = d_inode(c->dentry); |
| 612 | struct path upperpath = { .mnt = ovl_upper_mnt(ofs), .dentry = temp }; |
| 613 | int err; |
| 614 | |
| 615 | err = ovl_copy_xattr(c->dentry->d_sb, &c->lowerpath, temp); |
| 616 | if (err) |
| 617 | return err; |
| 618 | |
| 619 | if (inode->i_flags & OVL_COPY_I_FLAGS_MASK) { |
| 620 | /* |
| 621 | * Copy the fileattr inode flags that are the source of already |
| 622 | * copied i_flags |
| 623 | */ |
| 624 | err = ovl_copy_fileattr(inode, &c->lowerpath, &upperpath); |
| 625 | if (err) |
| 626 | return err; |
| 627 | } |
| 628 | |
| 629 | /* |
| 630 | * Store identifier of lower inode in upper inode xattr to |
| 631 | * allow lookup of the copy up origin inode. |
| 632 | * |
| 633 | * Don't set origin when we are breaking the association with a lower |
| 634 | * hard link. |
| 635 | */ |
| 636 | if (c->origin) { |
| 637 | err = ovl_set_origin(ofs, c->lowerpath.dentry, temp); |
| 638 | if (err) |
| 639 | return err; |
| 640 | } |
| 641 | |
| 642 | if (c->metacopy) { |
| 643 | err = ovl_check_setxattr(ofs, temp, OVL_XATTR_METACOPY, |
| 644 | NULL, 0, -EOPNOTSUPP); |
| 645 | if (err) |
| 646 | return err; |
| 647 | } |
| 648 | |
| 649 | inode_lock(temp->d_inode); |
| 650 | if (S_ISREG(c->stat.mode)) |
| 651 | err = ovl_set_size(ofs, temp, &c->stat); |
| 652 | if (!err) |
| 653 | err = ovl_set_attr(ofs, temp, &c->stat); |
| 654 | inode_unlock(temp->d_inode); |
| 655 | |
| 656 | return err; |
| 657 | } |
| 658 | |
| 659 | struct ovl_cu_creds { |
| 660 | const struct cred *old; |
| 661 | struct cred *new; |
| 662 | }; |
| 663 | |
| 664 | static int ovl_prep_cu_creds(struct dentry *dentry, struct ovl_cu_creds *cc) |
| 665 | { |
| 666 | int err; |
| 667 | |
| 668 | cc->old = cc->new = NULL; |
| 669 | err = security_inode_copy_up(dentry, &cc->new); |
| 670 | if (err < 0) |
| 671 | return err; |
| 672 | |
| 673 | if (cc->new) |
| 674 | cc->old = override_creds(cc->new); |
| 675 | |
| 676 | return 0; |
| 677 | } |
| 678 | |
| 679 | static void ovl_revert_cu_creds(struct ovl_cu_creds *cc) |
| 680 | { |
| 681 | if (cc->new) { |
| 682 | revert_creds(cc->old); |
| 683 | put_cred(cc->new); |
| 684 | } |
| 685 | } |
| 686 | |
| 687 | /* |
| 688 | * Copyup using workdir to prepare temp file. Used when copying up directories, |
| 689 | * special files or when upper fs doesn't support O_TMPFILE. |
| 690 | */ |
| 691 | static int ovl_copy_up_workdir(struct ovl_copy_up_ctx *c) |
| 692 | { |
| 693 | struct ovl_fs *ofs = OVL_FS(c->dentry->d_sb); |
| 694 | struct inode *inode; |
| 695 | struct inode *udir = d_inode(c->destdir), *wdir = d_inode(c->workdir); |
| 696 | struct path path = { .mnt = ovl_upper_mnt(ofs) }; |
| 697 | struct dentry *temp, *upper; |
| 698 | struct ovl_cu_creds cc; |
| 699 | int err; |
| 700 | struct ovl_cattr cattr = { |
| 701 | /* Can't properly set mode on creation because of the umask */ |
| 702 | .mode = c->stat.mode & S_IFMT, |
| 703 | .rdev = c->stat.rdev, |
| 704 | .link = c->link |
| 705 | }; |
| 706 | |
| 707 | /* workdir and destdir could be the same when copying up to indexdir */ |
| 708 | err = -EIO; |
| 709 | if (lock_rename(c->workdir, c->destdir) != NULL) |
| 710 | goto unlock; |
| 711 | |
| 712 | err = ovl_prep_cu_creds(c->dentry, &cc); |
| 713 | if (err) |
| 714 | goto unlock; |
| 715 | |
| 716 | temp = ovl_create_temp(ofs, c->workdir, &cattr); |
| 717 | ovl_revert_cu_creds(&cc); |
| 718 | |
| 719 | err = PTR_ERR(temp); |
| 720 | if (IS_ERR(temp)) |
| 721 | goto unlock; |
| 722 | |
| 723 | /* |
| 724 | * Copy up data first and then xattrs. Writing data after |
| 725 | * xattrs will remove security.capability xattr automatically. |
| 726 | */ |
| 727 | path.dentry = temp; |
| 728 | err = ovl_copy_up_data(c, &path); |
| 729 | if (err) |
| 730 | goto cleanup; |
| 731 | |
| 732 | err = ovl_copy_up_metadata(c, temp); |
| 733 | if (err) |
| 734 | goto cleanup; |
| 735 | |
| 736 | if (S_ISDIR(c->stat.mode) && c->indexed) { |
| 737 | err = ovl_create_index(c->dentry, c->lowerpath.dentry, temp); |
| 738 | if (err) |
| 739 | goto cleanup; |
| 740 | } |
| 741 | |
| 742 | upper = ovl_lookup_upper(ofs, c->destname.name, c->destdir, |
| 743 | c->destname.len); |
| 744 | err = PTR_ERR(upper); |
| 745 | if (IS_ERR(upper)) |
| 746 | goto cleanup; |
| 747 | |
| 748 | err = ovl_do_rename(ofs, wdir, temp, udir, upper, 0); |
| 749 | dput(upper); |
| 750 | if (err) |
| 751 | goto cleanup; |
| 752 | |
| 753 | if (!c->metacopy) |
| 754 | ovl_set_upperdata(d_inode(c->dentry)); |
| 755 | inode = d_inode(c->dentry); |
| 756 | ovl_inode_update(inode, temp); |
| 757 | if (S_ISDIR(inode->i_mode)) |
| 758 | ovl_set_flag(OVL_WHITEOUTS, inode); |
| 759 | unlock: |
| 760 | unlock_rename(c->workdir, c->destdir); |
| 761 | |
| 762 | return err; |
| 763 | |
| 764 | cleanup: |
| 765 | ovl_cleanup(ofs, wdir, temp); |
| 766 | dput(temp); |
| 767 | goto unlock; |
| 768 | } |
| 769 | |
| 770 | /* Copyup using O_TMPFILE which does not require cross dir locking */ |
| 771 | static int ovl_copy_up_tmpfile(struct ovl_copy_up_ctx *c) |
| 772 | { |
| 773 | struct ovl_fs *ofs = OVL_FS(c->dentry->d_sb); |
| 774 | struct inode *udir = d_inode(c->destdir); |
| 775 | struct dentry *temp, *upper; |
| 776 | struct file *tmpfile; |
| 777 | struct ovl_cu_creds cc; |
| 778 | int err; |
| 779 | |
| 780 | err = ovl_prep_cu_creds(c->dentry, &cc); |
| 781 | if (err) |
| 782 | return err; |
| 783 | |
| 784 | tmpfile = ovl_do_tmpfile(ofs, c->workdir, c->stat.mode); |
| 785 | ovl_revert_cu_creds(&cc); |
| 786 | |
| 787 | if (IS_ERR(tmpfile)) |
| 788 | return PTR_ERR(tmpfile); |
| 789 | |
| 790 | temp = tmpfile->f_path.dentry; |
| 791 | if (!c->metacopy && c->stat.size) { |
| 792 | err = ovl_copy_up_file(ofs, c->dentry, tmpfile, c->stat.size); |
| 793 | if (err) |
| 794 | goto out_fput; |
| 795 | } |
| 796 | |
| 797 | err = ovl_copy_up_metadata(c, temp); |
| 798 | if (err) |
| 799 | goto out_fput; |
| 800 | |
| 801 | inode_lock_nested(udir, I_MUTEX_PARENT); |
| 802 | |
| 803 | upper = ovl_lookup_upper(ofs, c->destname.name, c->destdir, |
| 804 | c->destname.len); |
| 805 | err = PTR_ERR(upper); |
| 806 | if (!IS_ERR(upper)) { |
| 807 | err = ovl_do_link(ofs, temp, udir, upper); |
| 808 | dput(upper); |
| 809 | } |
| 810 | inode_unlock(udir); |
| 811 | |
| 812 | if (err) |
| 813 | goto out_fput; |
| 814 | |
| 815 | if (!c->metacopy) |
| 816 | ovl_set_upperdata(d_inode(c->dentry)); |
| 817 | ovl_inode_update(d_inode(c->dentry), dget(temp)); |
| 818 | |
| 819 | out_fput: |
| 820 | fput(tmpfile); |
| 821 | return err; |
| 822 | } |
| 823 | |
| 824 | /* |
| 825 | * Copy up a single dentry |
| 826 | * |
| 827 | * All renames start with copy up of source if necessary. The actual |
| 828 | * rename will only proceed once the copy up was successful. Copy up uses |
| 829 | * upper parent i_mutex for exclusion. Since rename can change d_parent it |
| 830 | * is possible that the copy up will lock the old parent. At that point |
| 831 | * the file will have already been copied up anyway. |
| 832 | */ |
| 833 | static int ovl_do_copy_up(struct ovl_copy_up_ctx *c) |
| 834 | { |
| 835 | int err; |
| 836 | struct ovl_fs *ofs = OVL_FS(c->dentry->d_sb); |
| 837 | bool to_index = false; |
| 838 | |
| 839 | /* |
| 840 | * Indexed non-dir is copied up directly to the index entry and then |
| 841 | * hardlinked to upper dir. Indexed dir is copied up to indexdir, |
| 842 | * then index entry is created and then copied up dir installed. |
| 843 | * Copying dir up to indexdir instead of workdir simplifies locking. |
| 844 | */ |
| 845 | if (ovl_need_index(c->dentry)) { |
| 846 | c->indexed = true; |
| 847 | if (S_ISDIR(c->stat.mode)) |
| 848 | c->workdir = ovl_indexdir(c->dentry->d_sb); |
| 849 | else |
| 850 | to_index = true; |
| 851 | } |
| 852 | |
| 853 | if (S_ISDIR(c->stat.mode) || c->stat.nlink == 1 || to_index) |
| 854 | c->origin = true; |
| 855 | |
| 856 | if (to_index) { |
| 857 | c->destdir = ovl_indexdir(c->dentry->d_sb); |
| 858 | err = ovl_get_index_name(ofs, c->lowerpath.dentry, &c->destname); |
| 859 | if (err) |
| 860 | return err; |
| 861 | } else if (WARN_ON(!c->parent)) { |
| 862 | /* Disconnected dentry must be copied up to index dir */ |
| 863 | return -EIO; |
| 864 | } else { |
| 865 | /* |
| 866 | * Mark parent "impure" because it may now contain non-pure |
| 867 | * upper |
| 868 | */ |
| 869 | err = ovl_set_impure(c->parent, c->destdir); |
| 870 | if (err) |
| 871 | return err; |
| 872 | } |
| 873 | |
| 874 | /* Should we copyup with O_TMPFILE or with workdir? */ |
| 875 | if (S_ISREG(c->stat.mode) && ofs->tmpfile) |
| 876 | err = ovl_copy_up_tmpfile(c); |
| 877 | else |
| 878 | err = ovl_copy_up_workdir(c); |
| 879 | if (err) |
| 880 | goto out; |
| 881 | |
| 882 | if (c->indexed) |
| 883 | ovl_set_flag(OVL_INDEX, d_inode(c->dentry)); |
| 884 | |
| 885 | if (to_index) { |
| 886 | /* Initialize nlink for copy up of disconnected dentry */ |
| 887 | err = ovl_set_nlink_upper(c->dentry); |
| 888 | } else { |
| 889 | struct inode *udir = d_inode(c->destdir); |
| 890 | |
| 891 | /* Restore timestamps on parent (best effort) */ |
| 892 | inode_lock(udir); |
| 893 | ovl_set_timestamps(ofs, c->destdir, &c->pstat); |
| 894 | inode_unlock(udir); |
| 895 | |
| 896 | ovl_dentry_set_upper_alias(c->dentry); |
| 897 | } |
| 898 | |
| 899 | out: |
| 900 | if (to_index) |
| 901 | kfree(c->destname.name); |
| 902 | return err; |
| 903 | } |
| 904 | |
| 905 | static bool ovl_need_meta_copy_up(struct dentry *dentry, umode_t mode, |
| 906 | int flags) |
| 907 | { |
| 908 | struct ovl_fs *ofs = dentry->d_sb->s_fs_info; |
| 909 | |
| 910 | if (!ofs->config.metacopy) |
| 911 | return false; |
| 912 | |
| 913 | if (!S_ISREG(mode)) |
| 914 | return false; |
| 915 | |
| 916 | if (flags && ((OPEN_FMODE(flags) & FMODE_WRITE) || (flags & O_TRUNC))) |
| 917 | return false; |
| 918 | |
| 919 | return true; |
| 920 | } |
| 921 | |
| 922 | static ssize_t ovl_getxattr_value(const struct path *path, char *name, char **value) |
| 923 | { |
| 924 | ssize_t res; |
| 925 | char *buf; |
| 926 | |
| 927 | res = ovl_do_getxattr(path, name, NULL, 0); |
| 928 | if (res == -ENODATA || res == -EOPNOTSUPP) |
| 929 | res = 0; |
| 930 | |
| 931 | if (res > 0) { |
| 932 | buf = kzalloc(res, GFP_KERNEL); |
| 933 | if (!buf) |
| 934 | return -ENOMEM; |
| 935 | |
| 936 | res = ovl_do_getxattr(path, name, buf, res); |
| 937 | if (res < 0) |
| 938 | kfree(buf); |
| 939 | else |
| 940 | *value = buf; |
| 941 | } |
| 942 | return res; |
| 943 | } |
| 944 | |
| 945 | /* Copy up data of an inode which was copied up metadata only in the past. */ |
| 946 | static int ovl_copy_up_meta_inode_data(struct ovl_copy_up_ctx *c) |
| 947 | { |
| 948 | struct ovl_fs *ofs = OVL_FS(c->dentry->d_sb); |
| 949 | struct path upperpath; |
| 950 | int err; |
| 951 | char *capability = NULL; |
| 952 | ssize_t cap_size; |
| 953 | |
| 954 | ovl_path_upper(c->dentry, &upperpath); |
| 955 | if (WARN_ON(upperpath.dentry == NULL)) |
| 956 | return -EIO; |
| 957 | |
| 958 | if (c->stat.size) { |
| 959 | err = cap_size = ovl_getxattr_value(&upperpath, XATTR_NAME_CAPS, |
| 960 | &capability); |
| 961 | if (cap_size < 0) |
| 962 | goto out; |
| 963 | } |
| 964 | |
| 965 | err = ovl_copy_up_data(c, &upperpath); |
| 966 | if (err) |
| 967 | goto out_free; |
| 968 | |
| 969 | /* |
| 970 | * Writing to upper file will clear security.capability xattr. We |
| 971 | * don't want that to happen for normal copy-up operation. |
| 972 | */ |
| 973 | if (capability) { |
| 974 | err = ovl_do_setxattr(ofs, upperpath.dentry, XATTR_NAME_CAPS, |
| 975 | capability, cap_size, 0); |
| 976 | if (err) |
| 977 | goto out_free; |
| 978 | } |
| 979 | |
| 980 | |
| 981 | err = ovl_removexattr(ofs, upperpath.dentry, OVL_XATTR_METACOPY); |
| 982 | if (err) |
| 983 | goto out_free; |
| 984 | |
| 985 | ovl_set_upperdata(d_inode(c->dentry)); |
| 986 | out_free: |
| 987 | kfree(capability); |
| 988 | out: |
| 989 | return err; |
| 990 | } |
| 991 | |
| 992 | static int ovl_copy_up_one(struct dentry *parent, struct dentry *dentry, |
| 993 | int flags) |
| 994 | { |
| 995 | int err; |
| 996 | DEFINE_DELAYED_CALL(done); |
| 997 | struct path parentpath; |
| 998 | struct ovl_copy_up_ctx ctx = { |
| 999 | .parent = parent, |
| 1000 | .dentry = dentry, |
| 1001 | .workdir = ovl_workdir(dentry), |
| 1002 | }; |
| 1003 | |
| 1004 | if (WARN_ON(!ctx.workdir)) |
| 1005 | return -EROFS; |
| 1006 | |
| 1007 | ovl_path_lower(dentry, &ctx.lowerpath); |
| 1008 | err = vfs_getattr(&ctx.lowerpath, &ctx.stat, |
| 1009 | STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT); |
| 1010 | if (err) |
| 1011 | return err; |
| 1012 | |
| 1013 | if (!kuid_has_mapping(current_user_ns(), ctx.stat.uid) || |
| 1014 | !kgid_has_mapping(current_user_ns(), ctx.stat.gid)) |
| 1015 | return -EOVERFLOW; |
| 1016 | |
| 1017 | ctx.metacopy = ovl_need_meta_copy_up(dentry, ctx.stat.mode, flags); |
| 1018 | |
| 1019 | if (parent) { |
| 1020 | ovl_path_upper(parent, &parentpath); |
| 1021 | ctx.destdir = parentpath.dentry; |
| 1022 | ctx.destname = dentry->d_name; |
| 1023 | |
| 1024 | err = vfs_getattr(&parentpath, &ctx.pstat, |
| 1025 | STATX_ATIME | STATX_MTIME, |
| 1026 | AT_STATX_SYNC_AS_STAT); |
| 1027 | if (err) |
| 1028 | return err; |
| 1029 | } |
| 1030 | |
| 1031 | /* maybe truncate regular file. this has no effect on dirs */ |
| 1032 | if (flags & O_TRUNC) |
| 1033 | ctx.stat.size = 0; |
| 1034 | |
| 1035 | if (S_ISLNK(ctx.stat.mode)) { |
| 1036 | ctx.link = vfs_get_link(ctx.lowerpath.dentry, &done); |
| 1037 | if (IS_ERR(ctx.link)) |
| 1038 | return PTR_ERR(ctx.link); |
| 1039 | } |
| 1040 | |
| 1041 | err = ovl_copy_up_start(dentry, flags); |
| 1042 | /* err < 0: interrupted, err > 0: raced with another copy-up */ |
| 1043 | if (unlikely(err)) { |
| 1044 | if (err > 0) |
| 1045 | err = 0; |
| 1046 | } else { |
| 1047 | if (!ovl_dentry_upper(dentry)) |
| 1048 | err = ovl_do_copy_up(&ctx); |
| 1049 | if (!err && parent && !ovl_dentry_has_upper_alias(dentry)) |
| 1050 | err = ovl_link_up(&ctx); |
| 1051 | if (!err && ovl_dentry_needs_data_copy_up_locked(dentry, flags)) |
| 1052 | err = ovl_copy_up_meta_inode_data(&ctx); |
| 1053 | ovl_copy_up_end(dentry); |
| 1054 | } |
| 1055 | do_delayed_call(&done); |
| 1056 | |
| 1057 | return err; |
| 1058 | } |
| 1059 | |
| 1060 | static int ovl_copy_up_flags(struct dentry *dentry, int flags) |
| 1061 | { |
| 1062 | int err = 0; |
| 1063 | const struct cred *old_cred; |
| 1064 | bool disconnected = (dentry->d_flags & DCACHE_DISCONNECTED); |
| 1065 | |
| 1066 | /* |
| 1067 | * With NFS export, copy up can get called for a disconnected non-dir. |
| 1068 | * In this case, we will copy up lower inode to index dir without |
| 1069 | * linking it to upper dir. |
| 1070 | */ |
| 1071 | if (WARN_ON(disconnected && d_is_dir(dentry))) |
| 1072 | return -EIO; |
| 1073 | |
| 1074 | old_cred = ovl_override_creds(dentry->d_sb); |
| 1075 | while (!err) { |
| 1076 | struct dentry *next; |
| 1077 | struct dentry *parent = NULL; |
| 1078 | |
| 1079 | if (ovl_already_copied_up(dentry, flags)) |
| 1080 | break; |
| 1081 | |
| 1082 | next = dget(dentry); |
| 1083 | /* find the topmost dentry not yet copied up */ |
| 1084 | for (; !disconnected;) { |
| 1085 | parent = dget_parent(next); |
| 1086 | |
| 1087 | if (ovl_dentry_upper(parent)) |
| 1088 | break; |
| 1089 | |
| 1090 | dput(next); |
| 1091 | next = parent; |
| 1092 | } |
| 1093 | |
| 1094 | err = ovl_copy_up_one(parent, next, flags); |
| 1095 | |
| 1096 | dput(parent); |
| 1097 | dput(next); |
| 1098 | } |
| 1099 | revert_creds(old_cred); |
| 1100 | |
| 1101 | return err; |
| 1102 | } |
| 1103 | |
| 1104 | static bool ovl_open_need_copy_up(struct dentry *dentry, int flags) |
| 1105 | { |
| 1106 | /* Copy up of disconnected dentry does not set upper alias */ |
| 1107 | if (ovl_already_copied_up(dentry, flags)) |
| 1108 | return false; |
| 1109 | |
| 1110 | if (special_file(d_inode(dentry)->i_mode)) |
| 1111 | return false; |
| 1112 | |
| 1113 | if (!ovl_open_flags_need_copy_up(flags)) |
| 1114 | return false; |
| 1115 | |
| 1116 | return true; |
| 1117 | } |
| 1118 | |
| 1119 | int ovl_maybe_copy_up(struct dentry *dentry, int flags) |
| 1120 | { |
| 1121 | int err = 0; |
| 1122 | |
| 1123 | if (ovl_open_need_copy_up(dentry, flags)) { |
| 1124 | err = ovl_want_write(dentry); |
| 1125 | if (!err) { |
| 1126 | err = ovl_copy_up_flags(dentry, flags); |
| 1127 | ovl_drop_write(dentry); |
| 1128 | } |
| 1129 | } |
| 1130 | |
| 1131 | return err; |
| 1132 | } |
| 1133 | |
| 1134 | int ovl_copy_up_with_data(struct dentry *dentry) |
| 1135 | { |
| 1136 | return ovl_copy_up_flags(dentry, O_WRONLY); |
| 1137 | } |
| 1138 | |
| 1139 | int ovl_copy_up(struct dentry *dentry) |
| 1140 | { |
| 1141 | return ovl_copy_up_flags(dentry, 0); |
| 1142 | } |