| 1 | /* |
| 2 | * fs/cifs/dir.c |
| 3 | * |
| 4 | * vfs operations that deal with dentries |
| 5 | * |
| 6 | * Copyright (C) International Business Machines Corp., 2002,2009 |
| 7 | * Author(s): Steve French (sfrench@us.ibm.com) |
| 8 | * |
| 9 | * This library is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU Lesser General Public License as published |
| 11 | * by the Free Software Foundation; either version 2.1 of the License, or |
| 12 | * (at your option) any later version. |
| 13 | * |
| 14 | * This library is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
| 17 | * the GNU Lesser General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU Lesser General Public License |
| 20 | * along with this library; if not, write to the Free Software |
| 21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 22 | */ |
| 23 | #include <linux/fs.h> |
| 24 | #include <linux/stat.h> |
| 25 | #include <linux/slab.h> |
| 26 | #include <linux/namei.h> |
| 27 | #include <linux/mount.h> |
| 28 | #include <linux/file.h> |
| 29 | #include "cifsfs.h" |
| 30 | #include "cifspdu.h" |
| 31 | #include "cifsglob.h" |
| 32 | #include "cifsproto.h" |
| 33 | #include "cifs_debug.h" |
| 34 | #include "cifs_fs_sb.h" |
| 35 | #include "cifs_unicode.h" |
| 36 | |
| 37 | static void |
| 38 | renew_parental_timestamps(struct dentry *direntry) |
| 39 | { |
| 40 | /* BB check if there is a way to get the kernel to do this or if we |
| 41 | really need this */ |
| 42 | do { |
| 43 | direntry->d_time = jiffies; |
| 44 | direntry = direntry->d_parent; |
| 45 | } while (!IS_ROOT(direntry)); |
| 46 | } |
| 47 | |
| 48 | char * |
| 49 | cifs_build_path_to_root(struct smb_vol *vol, struct cifs_sb_info *cifs_sb, |
| 50 | struct cifs_tcon *tcon) |
| 51 | { |
| 52 | int pplen = vol->prepath ? strlen(vol->prepath) + 1 : 0; |
| 53 | int dfsplen; |
| 54 | char *full_path = NULL; |
| 55 | |
| 56 | /* if no prefix path, simply set path to the root of share to "" */ |
| 57 | if (pplen == 0) { |
| 58 | full_path = kzalloc(1, GFP_KERNEL); |
| 59 | return full_path; |
| 60 | } |
| 61 | |
| 62 | if (tcon->Flags & SMB_SHARE_IS_IN_DFS) |
| 63 | dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1); |
| 64 | else |
| 65 | dfsplen = 0; |
| 66 | |
| 67 | full_path = kmalloc(dfsplen + pplen + 1, GFP_KERNEL); |
| 68 | if (full_path == NULL) |
| 69 | return full_path; |
| 70 | |
| 71 | if (dfsplen) |
| 72 | strncpy(full_path, tcon->treeName, dfsplen); |
| 73 | full_path[dfsplen] = CIFS_DIR_SEP(cifs_sb); |
| 74 | strncpy(full_path + dfsplen + 1, vol->prepath, pplen); |
| 75 | convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb)); |
| 76 | full_path[dfsplen + pplen] = 0; /* add trailing null */ |
| 77 | return full_path; |
| 78 | } |
| 79 | |
| 80 | /* Note: caller must free return buffer */ |
| 81 | char * |
| 82 | build_path_from_dentry(struct dentry *direntry) |
| 83 | { |
| 84 | struct dentry *temp; |
| 85 | int namelen; |
| 86 | int dfsplen; |
| 87 | char *full_path; |
| 88 | char dirsep; |
| 89 | struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb); |
| 90 | struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb); |
| 91 | unsigned seq; |
| 92 | |
| 93 | dirsep = CIFS_DIR_SEP(cifs_sb); |
| 94 | if (tcon->Flags & SMB_SHARE_IS_IN_DFS) |
| 95 | dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1); |
| 96 | else |
| 97 | dfsplen = 0; |
| 98 | cifs_bp_rename_retry: |
| 99 | namelen = dfsplen; |
| 100 | seq = read_seqbegin(&rename_lock); |
| 101 | rcu_read_lock(); |
| 102 | for (temp = direntry; !IS_ROOT(temp);) { |
| 103 | namelen += (1 + temp->d_name.len); |
| 104 | temp = temp->d_parent; |
| 105 | if (temp == NULL) { |
| 106 | cifs_dbg(VFS, "corrupt dentry\n"); |
| 107 | rcu_read_unlock(); |
| 108 | return NULL; |
| 109 | } |
| 110 | } |
| 111 | rcu_read_unlock(); |
| 112 | |
| 113 | full_path = kmalloc(namelen+1, GFP_KERNEL); |
| 114 | if (full_path == NULL) |
| 115 | return full_path; |
| 116 | full_path[namelen] = 0; /* trailing null */ |
| 117 | rcu_read_lock(); |
| 118 | for (temp = direntry; !IS_ROOT(temp);) { |
| 119 | spin_lock(&temp->d_lock); |
| 120 | namelen -= 1 + temp->d_name.len; |
| 121 | if (namelen < 0) { |
| 122 | spin_unlock(&temp->d_lock); |
| 123 | break; |
| 124 | } else { |
| 125 | full_path[namelen] = dirsep; |
| 126 | strncpy(full_path + namelen + 1, temp->d_name.name, |
| 127 | temp->d_name.len); |
| 128 | cifs_dbg(FYI, "name: %s\n", full_path + namelen); |
| 129 | } |
| 130 | spin_unlock(&temp->d_lock); |
| 131 | temp = temp->d_parent; |
| 132 | if (temp == NULL) { |
| 133 | cifs_dbg(VFS, "corrupt dentry\n"); |
| 134 | rcu_read_unlock(); |
| 135 | kfree(full_path); |
| 136 | return NULL; |
| 137 | } |
| 138 | } |
| 139 | rcu_read_unlock(); |
| 140 | if (namelen != dfsplen || read_seqretry(&rename_lock, seq)) { |
| 141 | cifs_dbg(FYI, "did not end path lookup where expected. namelen=%ddfsplen=%d\n", |
| 142 | namelen, dfsplen); |
| 143 | /* presumably this is only possible if racing with a rename |
| 144 | of one of the parent directories (we can not lock the dentries |
| 145 | above us to prevent this, but retrying should be harmless) */ |
| 146 | kfree(full_path); |
| 147 | goto cifs_bp_rename_retry; |
| 148 | } |
| 149 | /* DIR_SEP already set for byte 0 / vs \ but not for |
| 150 | subsequent slashes in prepath which currently must |
| 151 | be entered the right way - not sure if there is an alternative |
| 152 | since the '\' is a valid posix character so we can not switch |
| 153 | those safely to '/' if any are found in the middle of the prepath */ |
| 154 | /* BB test paths to Windows with '/' in the midst of prepath */ |
| 155 | |
| 156 | if (dfsplen) { |
| 157 | strncpy(full_path, tcon->treeName, dfsplen); |
| 158 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) { |
| 159 | int i; |
| 160 | for (i = 0; i < dfsplen; i++) { |
| 161 | if (full_path[i] == '\\') |
| 162 | full_path[i] = '/'; |
| 163 | } |
| 164 | } |
| 165 | } |
| 166 | return full_path; |
| 167 | } |
| 168 | |
| 169 | /* |
| 170 | * Don't allow the separator character in a path component. |
| 171 | * The VFS will not allow "/", but "\" is allowed by posix. |
| 172 | */ |
| 173 | static int |
| 174 | check_name(struct dentry *direntry) |
| 175 | { |
| 176 | struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb); |
| 177 | int i; |
| 178 | |
| 179 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) { |
| 180 | for (i = 0; i < direntry->d_name.len; i++) { |
| 181 | if (direntry->d_name.name[i] == '\\') { |
| 182 | cifs_dbg(FYI, "Invalid file name\n"); |
| 183 | return -EINVAL; |
| 184 | } |
| 185 | } |
| 186 | } |
| 187 | return 0; |
| 188 | } |
| 189 | |
| 190 | |
| 191 | /* Inode operations in similar order to how they appear in Linux file fs.h */ |
| 192 | |
| 193 | static int |
| 194 | cifs_do_create(struct inode *inode, struct dentry *direntry, unsigned int xid, |
| 195 | struct tcon_link *tlink, unsigned oflags, umode_t mode, |
| 196 | __u32 *oplock, struct cifs_fid *fid) |
| 197 | { |
| 198 | int rc = -ENOENT; |
| 199 | int create_options = CREATE_NOT_DIR; |
| 200 | int desired_access; |
| 201 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
| 202 | struct cifs_tcon *tcon = tlink_tcon(tlink); |
| 203 | char *full_path = NULL; |
| 204 | FILE_ALL_INFO *buf = NULL; |
| 205 | struct inode *newinode = NULL; |
| 206 | int disposition; |
| 207 | struct TCP_Server_Info *server = tcon->ses->server; |
| 208 | struct cifs_open_parms oparms; |
| 209 | |
| 210 | *oplock = 0; |
| 211 | if (tcon->ses->server->oplocks) |
| 212 | *oplock = REQ_OPLOCK; |
| 213 | |
| 214 | full_path = build_path_from_dentry(direntry); |
| 215 | if (full_path == NULL) { |
| 216 | rc = -ENOMEM; |
| 217 | goto out; |
| 218 | } |
| 219 | |
| 220 | if (tcon->unix_ext && cap_unix(tcon->ses) && !tcon->broken_posix_open && |
| 221 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
| 222 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { |
| 223 | rc = cifs_posix_open(full_path, &newinode, inode->i_sb, mode, |
| 224 | oflags, oplock, &fid->netfid, xid); |
| 225 | switch (rc) { |
| 226 | case 0: |
| 227 | if (newinode == NULL) { |
| 228 | /* query inode info */ |
| 229 | goto cifs_create_get_file_info; |
| 230 | } |
| 231 | |
| 232 | if (!S_ISREG(newinode->i_mode)) { |
| 233 | /* |
| 234 | * The server may allow us to open things like |
| 235 | * FIFOs, but the client isn't set up to deal |
| 236 | * with that. If it's not a regular file, just |
| 237 | * close it and proceed as if it were a normal |
| 238 | * lookup. |
| 239 | */ |
| 240 | CIFSSMBClose(xid, tcon, fid->netfid); |
| 241 | goto cifs_create_get_file_info; |
| 242 | } |
| 243 | /* success, no need to query */ |
| 244 | goto cifs_create_set_dentry; |
| 245 | |
| 246 | case -ENOENT: |
| 247 | goto cifs_create_get_file_info; |
| 248 | |
| 249 | case -EIO: |
| 250 | case -EINVAL: |
| 251 | /* |
| 252 | * EIO could indicate that (posix open) operation is not |
| 253 | * supported, despite what server claimed in capability |
| 254 | * negotiation. |
| 255 | * |
| 256 | * POSIX open in samba versions 3.3.1 and earlier could |
| 257 | * incorrectly fail with invalid parameter. |
| 258 | */ |
| 259 | tcon->broken_posix_open = true; |
| 260 | break; |
| 261 | |
| 262 | case -EREMOTE: |
| 263 | case -EOPNOTSUPP: |
| 264 | /* |
| 265 | * EREMOTE indicates DFS junction, which is not handled |
| 266 | * in posix open. If either that or op not supported |
| 267 | * returned, follow the normal lookup. |
| 268 | */ |
| 269 | break; |
| 270 | |
| 271 | default: |
| 272 | goto out; |
| 273 | } |
| 274 | /* |
| 275 | * fallthrough to retry, using older open call, this is case |
| 276 | * where server does not support this SMB level, and falsely |
| 277 | * claims capability (also get here for DFS case which should be |
| 278 | * rare for path not covered on files) |
| 279 | */ |
| 280 | } |
| 281 | |
| 282 | desired_access = 0; |
| 283 | if (OPEN_FMODE(oflags) & FMODE_READ) |
| 284 | desired_access |= GENERIC_READ; /* is this too little? */ |
| 285 | if (OPEN_FMODE(oflags) & FMODE_WRITE) |
| 286 | desired_access |= GENERIC_WRITE; |
| 287 | |
| 288 | disposition = FILE_OVERWRITE_IF; |
| 289 | if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) |
| 290 | disposition = FILE_CREATE; |
| 291 | else if ((oflags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC)) |
| 292 | disposition = FILE_OVERWRITE_IF; |
| 293 | else if ((oflags & O_CREAT) == O_CREAT) |
| 294 | disposition = FILE_OPEN_IF; |
| 295 | else |
| 296 | cifs_dbg(FYI, "Create flag not set in create function\n"); |
| 297 | |
| 298 | /* |
| 299 | * BB add processing to set equivalent of mode - e.g. via CreateX with |
| 300 | * ACLs |
| 301 | */ |
| 302 | |
| 303 | if (!server->ops->open) { |
| 304 | rc = -ENOSYS; |
| 305 | goto out; |
| 306 | } |
| 307 | |
| 308 | buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); |
| 309 | if (buf == NULL) { |
| 310 | rc = -ENOMEM; |
| 311 | goto out; |
| 312 | } |
| 313 | |
| 314 | /* |
| 315 | * if we're not using unix extensions, see if we need to set |
| 316 | * ATTR_READONLY on the create call |
| 317 | */ |
| 318 | if (!tcon->unix_ext && (mode & S_IWUGO) == 0) |
| 319 | create_options |= CREATE_OPTION_READONLY; |
| 320 | |
| 321 | if (backup_cred(cifs_sb)) |
| 322 | create_options |= CREATE_OPEN_BACKUP_INTENT; |
| 323 | |
| 324 | oparms.tcon = tcon; |
| 325 | oparms.cifs_sb = cifs_sb; |
| 326 | oparms.desired_access = desired_access; |
| 327 | oparms.create_options = create_options; |
| 328 | oparms.disposition = disposition; |
| 329 | oparms.path = full_path; |
| 330 | oparms.fid = fid; |
| 331 | oparms.reconnect = false; |
| 332 | |
| 333 | rc = server->ops->open(xid, &oparms, oplock, buf); |
| 334 | if (rc) { |
| 335 | cifs_dbg(FYI, "cifs_create returned 0x%x\n", rc); |
| 336 | goto out; |
| 337 | } |
| 338 | |
| 339 | /* |
| 340 | * If Open reported that we actually created a file then we now have to |
| 341 | * set the mode if possible. |
| 342 | */ |
| 343 | if ((tcon->unix_ext) && (*oplock & CIFS_CREATE_ACTION)) { |
| 344 | struct cifs_unix_set_info_args args = { |
| 345 | .mode = mode, |
| 346 | .ctime = NO_CHANGE_64, |
| 347 | .atime = NO_CHANGE_64, |
| 348 | .mtime = NO_CHANGE_64, |
| 349 | .device = 0, |
| 350 | }; |
| 351 | |
| 352 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) { |
| 353 | args.uid = current_fsuid(); |
| 354 | if (inode->i_mode & S_ISGID) |
| 355 | args.gid = inode->i_gid; |
| 356 | else |
| 357 | args.gid = current_fsgid(); |
| 358 | } else { |
| 359 | args.uid = INVALID_UID; /* no change */ |
| 360 | args.gid = INVALID_GID; /* no change */ |
| 361 | } |
| 362 | CIFSSMBUnixSetFileInfo(xid, tcon, &args, fid->netfid, |
| 363 | current->tgid); |
| 364 | } else { |
| 365 | /* |
| 366 | * BB implement mode setting via Windows security |
| 367 | * descriptors e.g. |
| 368 | */ |
| 369 | /* CIFSSMBWinSetPerms(xid,tcon,path,mode,-1,-1,nls);*/ |
| 370 | |
| 371 | /* Could set r/o dos attribute if mode & 0222 == 0 */ |
| 372 | } |
| 373 | |
| 374 | cifs_create_get_file_info: |
| 375 | /* server might mask mode so we have to query for it */ |
| 376 | if (tcon->unix_ext) |
| 377 | rc = cifs_get_inode_info_unix(&newinode, full_path, inode->i_sb, |
| 378 | xid); |
| 379 | else { |
| 380 | rc = cifs_get_inode_info(&newinode, full_path, buf, inode->i_sb, |
| 381 | xid, fid); |
| 382 | if (newinode) { |
| 383 | if (server->ops->set_lease_key) |
| 384 | server->ops->set_lease_key(newinode, fid); |
| 385 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) |
| 386 | newinode->i_mode = mode; |
| 387 | if ((*oplock & CIFS_CREATE_ACTION) && |
| 388 | (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)) { |
| 389 | newinode->i_uid = current_fsuid(); |
| 390 | if (inode->i_mode & S_ISGID) |
| 391 | newinode->i_gid = inode->i_gid; |
| 392 | else |
| 393 | newinode->i_gid = current_fsgid(); |
| 394 | } |
| 395 | } |
| 396 | } |
| 397 | |
| 398 | cifs_create_set_dentry: |
| 399 | if (rc != 0) { |
| 400 | cifs_dbg(FYI, "Create worked, get_inode_info failed rc = %d\n", |
| 401 | rc); |
| 402 | if (server->ops->close) |
| 403 | server->ops->close(xid, tcon, fid); |
| 404 | goto out; |
| 405 | } |
| 406 | d_drop(direntry); |
| 407 | d_add(direntry, newinode); |
| 408 | |
| 409 | out: |
| 410 | kfree(buf); |
| 411 | kfree(full_path); |
| 412 | return rc; |
| 413 | } |
| 414 | |
| 415 | int |
| 416 | cifs_atomic_open(struct inode *inode, struct dentry *direntry, |
| 417 | struct file *file, unsigned oflags, umode_t mode, |
| 418 | int *opened) |
| 419 | { |
| 420 | int rc; |
| 421 | unsigned int xid; |
| 422 | struct tcon_link *tlink; |
| 423 | struct cifs_tcon *tcon; |
| 424 | struct TCP_Server_Info *server; |
| 425 | struct cifs_fid fid; |
| 426 | struct cifs_pending_open open; |
| 427 | __u32 oplock; |
| 428 | struct cifsFileInfo *file_info; |
| 429 | |
| 430 | /* |
| 431 | * Posix open is only called (at lookup time) for file create now. For |
| 432 | * opens (rather than creates), because we do not know if it is a file |
| 433 | * or directory yet, and current Samba no longer allows us to do posix |
| 434 | * open on dirs, we could end up wasting an open call on what turns out |
| 435 | * to be a dir. For file opens, we wait to call posix open till |
| 436 | * cifs_open. It could be added to atomic_open in the future but the |
| 437 | * performance tradeoff of the extra network request when EISDIR or |
| 438 | * EACCES is returned would have to be weighed against the 50% reduction |
| 439 | * in network traffic in the other paths. |
| 440 | */ |
| 441 | if (!(oflags & O_CREAT)) { |
| 442 | struct dentry *res; |
| 443 | |
| 444 | /* |
| 445 | * Check for hashed negative dentry. We have already revalidated |
| 446 | * the dentry and it is fine. No need to perform another lookup. |
| 447 | */ |
| 448 | if (!d_unhashed(direntry)) |
| 449 | return -ENOENT; |
| 450 | |
| 451 | res = cifs_lookup(inode, direntry, 0); |
| 452 | if (IS_ERR(res)) |
| 453 | return PTR_ERR(res); |
| 454 | |
| 455 | return finish_no_open(file, res); |
| 456 | } |
| 457 | |
| 458 | rc = check_name(direntry); |
| 459 | if (rc) |
| 460 | return rc; |
| 461 | |
| 462 | xid = get_xid(); |
| 463 | |
| 464 | cifs_dbg(FYI, "parent inode = 0x%p name is: %pd and dentry = 0x%p\n", |
| 465 | inode, direntry, direntry); |
| 466 | |
| 467 | tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb)); |
| 468 | if (IS_ERR(tlink)) { |
| 469 | rc = PTR_ERR(tlink); |
| 470 | goto out_free_xid; |
| 471 | } |
| 472 | |
| 473 | tcon = tlink_tcon(tlink); |
| 474 | server = tcon->ses->server; |
| 475 | |
| 476 | if (server->ops->new_lease_key) |
| 477 | server->ops->new_lease_key(&fid); |
| 478 | |
| 479 | cifs_add_pending_open(&fid, tlink, &open); |
| 480 | |
| 481 | rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode, |
| 482 | &oplock, &fid); |
| 483 | |
| 484 | if (rc) { |
| 485 | cifs_del_pending_open(&open); |
| 486 | goto out; |
| 487 | } |
| 488 | |
| 489 | if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) |
| 490 | *opened |= FILE_CREATED; |
| 491 | |
| 492 | rc = finish_open(file, direntry, generic_file_open, opened); |
| 493 | if (rc) { |
| 494 | if (server->ops->close) |
| 495 | server->ops->close(xid, tcon, &fid); |
| 496 | cifs_del_pending_open(&open); |
| 497 | goto out; |
| 498 | } |
| 499 | |
| 500 | if (file->f_flags & O_DIRECT && |
| 501 | CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) { |
| 502 | if (CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_NO_BRL) |
| 503 | file->f_op = &cifs_file_direct_nobrl_ops; |
| 504 | else |
| 505 | file->f_op = &cifs_file_direct_ops; |
| 506 | } |
| 507 | |
| 508 | file_info = cifs_new_fileinfo(&fid, file, tlink, oplock); |
| 509 | if (file_info == NULL) { |
| 510 | if (server->ops->close) |
| 511 | server->ops->close(xid, tcon, &fid); |
| 512 | cifs_del_pending_open(&open); |
| 513 | fput(file); |
| 514 | rc = -ENOMEM; |
| 515 | } |
| 516 | |
| 517 | out: |
| 518 | cifs_put_tlink(tlink); |
| 519 | out_free_xid: |
| 520 | free_xid(xid); |
| 521 | return rc; |
| 522 | } |
| 523 | |
| 524 | int cifs_create(struct inode *inode, struct dentry *direntry, umode_t mode, |
| 525 | bool excl) |
| 526 | { |
| 527 | int rc; |
| 528 | unsigned int xid = get_xid(); |
| 529 | /* |
| 530 | * BB below access is probably too much for mknod to request |
| 531 | * but we have to do query and setpathinfo so requesting |
| 532 | * less could fail (unless we want to request getatr and setatr |
| 533 | * permissions (only). At least for POSIX we do not have to |
| 534 | * request so much. |
| 535 | */ |
| 536 | unsigned oflags = O_EXCL | O_CREAT | O_RDWR; |
| 537 | struct tcon_link *tlink; |
| 538 | struct cifs_tcon *tcon; |
| 539 | struct TCP_Server_Info *server; |
| 540 | struct cifs_fid fid; |
| 541 | __u32 oplock; |
| 542 | |
| 543 | cifs_dbg(FYI, "cifs_create parent inode = 0x%p name is: %pd and dentry = 0x%p\n", |
| 544 | inode, direntry, direntry); |
| 545 | |
| 546 | tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb)); |
| 547 | rc = PTR_ERR(tlink); |
| 548 | if (IS_ERR(tlink)) |
| 549 | goto out_free_xid; |
| 550 | |
| 551 | tcon = tlink_tcon(tlink); |
| 552 | server = tcon->ses->server; |
| 553 | |
| 554 | if (server->ops->new_lease_key) |
| 555 | server->ops->new_lease_key(&fid); |
| 556 | |
| 557 | rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode, |
| 558 | &oplock, &fid); |
| 559 | if (!rc && server->ops->close) |
| 560 | server->ops->close(xid, tcon, &fid); |
| 561 | |
| 562 | cifs_put_tlink(tlink); |
| 563 | out_free_xid: |
| 564 | free_xid(xid); |
| 565 | return rc; |
| 566 | } |
| 567 | |
| 568 | int cifs_mknod(struct inode *inode, struct dentry *direntry, umode_t mode, |
| 569 | dev_t device_number) |
| 570 | { |
| 571 | int rc = -EPERM; |
| 572 | unsigned int xid; |
| 573 | int create_options = CREATE_NOT_DIR | CREATE_OPTION_SPECIAL; |
| 574 | struct cifs_sb_info *cifs_sb; |
| 575 | struct tcon_link *tlink; |
| 576 | struct cifs_tcon *tcon; |
| 577 | struct cifs_io_parms io_parms; |
| 578 | char *full_path = NULL; |
| 579 | struct inode *newinode = NULL; |
| 580 | __u32 oplock = 0; |
| 581 | struct cifs_fid fid; |
| 582 | struct cifs_open_parms oparms; |
| 583 | FILE_ALL_INFO *buf = NULL; |
| 584 | unsigned int bytes_written; |
| 585 | struct win_dev *pdev; |
| 586 | struct kvec iov[2]; |
| 587 | |
| 588 | if (!old_valid_dev(device_number)) |
| 589 | return -EINVAL; |
| 590 | |
| 591 | cifs_sb = CIFS_SB(inode->i_sb); |
| 592 | tlink = cifs_sb_tlink(cifs_sb); |
| 593 | if (IS_ERR(tlink)) |
| 594 | return PTR_ERR(tlink); |
| 595 | |
| 596 | tcon = tlink_tcon(tlink); |
| 597 | |
| 598 | xid = get_xid(); |
| 599 | |
| 600 | full_path = build_path_from_dentry(direntry); |
| 601 | if (full_path == NULL) { |
| 602 | rc = -ENOMEM; |
| 603 | goto mknod_out; |
| 604 | } |
| 605 | |
| 606 | if (tcon->unix_ext) { |
| 607 | struct cifs_unix_set_info_args args = { |
| 608 | .mode = mode & ~current_umask(), |
| 609 | .ctime = NO_CHANGE_64, |
| 610 | .atime = NO_CHANGE_64, |
| 611 | .mtime = NO_CHANGE_64, |
| 612 | .device = device_number, |
| 613 | }; |
| 614 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) { |
| 615 | args.uid = current_fsuid(); |
| 616 | args.gid = current_fsgid(); |
| 617 | } else { |
| 618 | args.uid = INVALID_UID; /* no change */ |
| 619 | args.gid = INVALID_GID; /* no change */ |
| 620 | } |
| 621 | rc = CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args, |
| 622 | cifs_sb->local_nls, |
| 623 | cifs_remap(cifs_sb)); |
| 624 | if (rc) |
| 625 | goto mknod_out; |
| 626 | |
| 627 | rc = cifs_get_inode_info_unix(&newinode, full_path, |
| 628 | inode->i_sb, xid); |
| 629 | |
| 630 | if (rc == 0) |
| 631 | d_instantiate(direntry, newinode); |
| 632 | goto mknod_out; |
| 633 | } |
| 634 | |
| 635 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)) |
| 636 | goto mknod_out; |
| 637 | |
| 638 | |
| 639 | cifs_dbg(FYI, "sfu compat create special file\n"); |
| 640 | |
| 641 | buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); |
| 642 | if (buf == NULL) { |
| 643 | kfree(full_path); |
| 644 | rc = -ENOMEM; |
| 645 | free_xid(xid); |
| 646 | return rc; |
| 647 | } |
| 648 | |
| 649 | if (backup_cred(cifs_sb)) |
| 650 | create_options |= CREATE_OPEN_BACKUP_INTENT; |
| 651 | |
| 652 | oparms.tcon = tcon; |
| 653 | oparms.cifs_sb = cifs_sb; |
| 654 | oparms.desired_access = GENERIC_WRITE; |
| 655 | oparms.create_options = create_options; |
| 656 | oparms.disposition = FILE_CREATE; |
| 657 | oparms.path = full_path; |
| 658 | oparms.fid = &fid; |
| 659 | oparms.reconnect = false; |
| 660 | |
| 661 | if (tcon->ses->server->oplocks) |
| 662 | oplock = REQ_OPLOCK; |
| 663 | else |
| 664 | oplock = 0; |
| 665 | rc = tcon->ses->server->ops->open(xid, &oparms, &oplock, buf); |
| 666 | if (rc) |
| 667 | goto mknod_out; |
| 668 | |
| 669 | /* |
| 670 | * BB Do not bother to decode buf since no local inode yet to put |
| 671 | * timestamps in, but we can reuse it safely. |
| 672 | */ |
| 673 | |
| 674 | pdev = (struct win_dev *)buf; |
| 675 | io_parms.pid = current->tgid; |
| 676 | io_parms.tcon = tcon; |
| 677 | io_parms.offset = 0; |
| 678 | io_parms.length = sizeof(struct win_dev); |
| 679 | iov[1].iov_base = buf; |
| 680 | iov[1].iov_len = sizeof(struct win_dev); |
| 681 | if (S_ISCHR(mode)) { |
| 682 | memcpy(pdev->type, "IntxCHR", 8); |
| 683 | pdev->major = cpu_to_le64(MAJOR(device_number)); |
| 684 | pdev->minor = cpu_to_le64(MINOR(device_number)); |
| 685 | rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms, |
| 686 | &bytes_written, iov, 1); |
| 687 | } else if (S_ISBLK(mode)) { |
| 688 | memcpy(pdev->type, "IntxBLK", 8); |
| 689 | pdev->major = cpu_to_le64(MAJOR(device_number)); |
| 690 | pdev->minor = cpu_to_le64(MINOR(device_number)); |
| 691 | rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms, |
| 692 | &bytes_written, iov, 1); |
| 693 | } /* else if (S_ISFIFO) */ |
| 694 | tcon->ses->server->ops->close(xid, tcon, &fid); |
| 695 | d_drop(direntry); |
| 696 | |
| 697 | /* FIXME: add code here to set EAs */ |
| 698 | |
| 699 | mknod_out: |
| 700 | kfree(full_path); |
| 701 | kfree(buf); |
| 702 | free_xid(xid); |
| 703 | cifs_put_tlink(tlink); |
| 704 | return rc; |
| 705 | } |
| 706 | |
| 707 | struct dentry * |
| 708 | cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry, |
| 709 | unsigned int flags) |
| 710 | { |
| 711 | unsigned int xid; |
| 712 | int rc = 0; /* to get around spurious gcc warning, set to zero here */ |
| 713 | struct cifs_sb_info *cifs_sb; |
| 714 | struct tcon_link *tlink; |
| 715 | struct cifs_tcon *pTcon; |
| 716 | struct inode *newInode = NULL; |
| 717 | char *full_path = NULL; |
| 718 | |
| 719 | xid = get_xid(); |
| 720 | |
| 721 | cifs_dbg(FYI, "parent inode = 0x%p name is: %pd and dentry = 0x%p\n", |
| 722 | parent_dir_inode, direntry, direntry); |
| 723 | |
| 724 | /* check whether path exists */ |
| 725 | |
| 726 | cifs_sb = CIFS_SB(parent_dir_inode->i_sb); |
| 727 | tlink = cifs_sb_tlink(cifs_sb); |
| 728 | if (IS_ERR(tlink)) { |
| 729 | free_xid(xid); |
| 730 | return (struct dentry *)tlink; |
| 731 | } |
| 732 | pTcon = tlink_tcon(tlink); |
| 733 | |
| 734 | rc = check_name(direntry); |
| 735 | if (rc) |
| 736 | goto lookup_out; |
| 737 | |
| 738 | /* can not grab the rename sem here since it would |
| 739 | deadlock in the cases (beginning of sys_rename itself) |
| 740 | in which we already have the sb rename sem */ |
| 741 | full_path = build_path_from_dentry(direntry); |
| 742 | if (full_path == NULL) { |
| 743 | rc = -ENOMEM; |
| 744 | goto lookup_out; |
| 745 | } |
| 746 | |
| 747 | if (d_really_is_positive(direntry)) { |
| 748 | cifs_dbg(FYI, "non-NULL inode in lookup\n"); |
| 749 | } else { |
| 750 | cifs_dbg(FYI, "NULL inode in lookup\n"); |
| 751 | } |
| 752 | cifs_dbg(FYI, "Full path: %s inode = 0x%p\n", |
| 753 | full_path, d_inode(direntry)); |
| 754 | |
| 755 | if (pTcon->unix_ext) { |
| 756 | rc = cifs_get_inode_info_unix(&newInode, full_path, |
| 757 | parent_dir_inode->i_sb, xid); |
| 758 | } else { |
| 759 | rc = cifs_get_inode_info(&newInode, full_path, NULL, |
| 760 | parent_dir_inode->i_sb, xid, NULL); |
| 761 | } |
| 762 | |
| 763 | if ((rc == 0) && (newInode != NULL)) { |
| 764 | d_add(direntry, newInode); |
| 765 | /* since paths are not looked up by component - the parent |
| 766 | directories are presumed to be good here */ |
| 767 | renew_parental_timestamps(direntry); |
| 768 | |
| 769 | } else if (rc == -ENOENT) { |
| 770 | rc = 0; |
| 771 | direntry->d_time = jiffies; |
| 772 | d_add(direntry, NULL); |
| 773 | /* if it was once a directory (but how can we tell?) we could do |
| 774 | shrink_dcache_parent(direntry); */ |
| 775 | } else if (rc != -EACCES) { |
| 776 | cifs_dbg(FYI, "Unexpected lookup error %d\n", rc); |
| 777 | /* We special case check for Access Denied - since that |
| 778 | is a common return code */ |
| 779 | } |
| 780 | |
| 781 | lookup_out: |
| 782 | kfree(full_path); |
| 783 | cifs_put_tlink(tlink); |
| 784 | free_xid(xid); |
| 785 | return ERR_PTR(rc); |
| 786 | } |
| 787 | |
| 788 | static int |
| 789 | cifs_d_revalidate(struct dentry *direntry, unsigned int flags) |
| 790 | { |
| 791 | if (flags & LOOKUP_RCU) |
| 792 | return -ECHILD; |
| 793 | |
| 794 | if (d_really_is_positive(direntry)) { |
| 795 | if (cifs_revalidate_dentry(direntry)) |
| 796 | return 0; |
| 797 | else { |
| 798 | /* |
| 799 | * If the inode wasn't known to be a dfs entry when |
| 800 | * the dentry was instantiated, such as when created |
| 801 | * via ->readdir(), it needs to be set now since the |
| 802 | * attributes will have been updated by |
| 803 | * cifs_revalidate_dentry(). |
| 804 | */ |
| 805 | if (IS_AUTOMOUNT(d_inode(direntry)) && |
| 806 | !(direntry->d_flags & DCACHE_NEED_AUTOMOUNT)) { |
| 807 | spin_lock(&direntry->d_lock); |
| 808 | direntry->d_flags |= DCACHE_NEED_AUTOMOUNT; |
| 809 | spin_unlock(&direntry->d_lock); |
| 810 | } |
| 811 | |
| 812 | return 1; |
| 813 | } |
| 814 | } |
| 815 | |
| 816 | /* |
| 817 | * This may be nfsd (or something), anyway, we can't see the |
| 818 | * intent of this. So, since this can be for creation, drop it. |
| 819 | */ |
| 820 | if (!flags) |
| 821 | return 0; |
| 822 | |
| 823 | /* |
| 824 | * Drop the negative dentry, in order to make sure to use the |
| 825 | * case sensitive name which is specified by user if this is |
| 826 | * for creation. |
| 827 | */ |
| 828 | if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET)) |
| 829 | return 0; |
| 830 | |
| 831 | if (time_after(jiffies, direntry->d_time + HZ) || !lookupCacheEnabled) |
| 832 | return 0; |
| 833 | |
| 834 | return 1; |
| 835 | } |
| 836 | |
| 837 | /* static int cifs_d_delete(struct dentry *direntry) |
| 838 | { |
| 839 | int rc = 0; |
| 840 | |
| 841 | cifs_dbg(FYI, "In cifs d_delete, name = %pd\n", direntry); |
| 842 | |
| 843 | return rc; |
| 844 | } */ |
| 845 | |
| 846 | const struct dentry_operations cifs_dentry_ops = { |
| 847 | .d_revalidate = cifs_d_revalidate, |
| 848 | .d_automount = cifs_dfs_d_automount, |
| 849 | /* d_delete: cifs_d_delete, */ /* not needed except for debugging */ |
| 850 | }; |
| 851 | |
| 852 | static int cifs_ci_hash(const struct dentry *dentry, struct qstr *q) |
| 853 | { |
| 854 | struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls; |
| 855 | unsigned long hash; |
| 856 | wchar_t c; |
| 857 | int i, charlen; |
| 858 | |
| 859 | hash = init_name_hash(); |
| 860 | for (i = 0; i < q->len; i += charlen) { |
| 861 | charlen = codepage->char2uni(&q->name[i], q->len - i, &c); |
| 862 | /* error out if we can't convert the character */ |
| 863 | if (unlikely(charlen < 0)) |
| 864 | return charlen; |
| 865 | hash = partial_name_hash(cifs_toupper(c), hash); |
| 866 | } |
| 867 | q->hash = end_name_hash(hash); |
| 868 | |
| 869 | return 0; |
| 870 | } |
| 871 | |
| 872 | static int cifs_ci_compare(const struct dentry *parent, const struct dentry *dentry, |
| 873 | unsigned int len, const char *str, const struct qstr *name) |
| 874 | { |
| 875 | struct nls_table *codepage = CIFS_SB(parent->d_sb)->local_nls; |
| 876 | wchar_t c1, c2; |
| 877 | int i, l1, l2; |
| 878 | |
| 879 | /* |
| 880 | * We make the assumption here that uppercase characters in the local |
| 881 | * codepage are always the same length as their lowercase counterparts. |
| 882 | * |
| 883 | * If that's ever not the case, then this will fail to match it. |
| 884 | */ |
| 885 | if (name->len != len) |
| 886 | return 1; |
| 887 | |
| 888 | for (i = 0; i < len; i += l1) { |
| 889 | /* Convert characters in both strings to UTF-16. */ |
| 890 | l1 = codepage->char2uni(&str[i], len - i, &c1); |
| 891 | l2 = codepage->char2uni(&name->name[i], name->len - i, &c2); |
| 892 | |
| 893 | /* |
| 894 | * If we can't convert either character, just declare it to |
| 895 | * be 1 byte long and compare the original byte. |
| 896 | */ |
| 897 | if (unlikely(l1 < 0 && l2 < 0)) { |
| 898 | if (str[i] != name->name[i]) |
| 899 | return 1; |
| 900 | l1 = 1; |
| 901 | continue; |
| 902 | } |
| 903 | |
| 904 | /* |
| 905 | * Here, we again ass|u|me that upper/lowercase versions of |
| 906 | * a character are the same length in the local NLS. |
| 907 | */ |
| 908 | if (l1 != l2) |
| 909 | return 1; |
| 910 | |
| 911 | /* Now compare uppercase versions of these characters */ |
| 912 | if (cifs_toupper(c1) != cifs_toupper(c2)) |
| 913 | return 1; |
| 914 | } |
| 915 | |
| 916 | return 0; |
| 917 | } |
| 918 | |
| 919 | const struct dentry_operations cifs_ci_dentry_ops = { |
| 920 | .d_revalidate = cifs_d_revalidate, |
| 921 | .d_hash = cifs_ci_hash, |
| 922 | .d_compare = cifs_ci_compare, |
| 923 | .d_automount = cifs_dfs_d_automount, |
| 924 | }; |