tools/virtiofsd/passthrough_helpers.h

   1 /*
   2  * FUSE: Filesystem in Userspace
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  14  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  16  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  17  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  18  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  19  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  20  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  21  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  22  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  23  * SUCH DAMAGE
  24  */
  25
  26 /*
  27  * Creates files on the underlying file system in response to a FUSE_MKNOD
  28  * operation
  29  */
  30 static int mknod_wrapper(int dirfd, const char *path, const char *link,
  31                          int mode, dev_t rdev)
  32 {
  33     int res;
  34
  35     if (S_ISREG(mode)) {
  36         res = openat(dirfd, path, O_CREAT | O_EXCL | O_WRONLY, mode);
  37         if (res >= 0) {
  38             res = close(res);
  39         }
  40     } else if (S_ISDIR(mode)) {
  41         res = mkdirat(dirfd, path, mode);
  42     } else if (S_ISLNK(mode) && link != NULL) {
  43         res = symlinkat(link, dirfd, path);
  44     } else if (S_ISFIFO(mode)) {
  45         res = mkfifoat(dirfd, path, mode);
  46     } else {
  47         res = mknodat(dirfd, path, mode, rdev);
  48     }
  49
  50     return res;
  51 }