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/*
* FUSE: Filesystem in Userspace
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE
*/
#ifndef FUSE_EXAMPLE_PASSTHROUGH_HELPERS_H_
#define FUSE_EXAMPLE_PASSTHROUGH_HELPERS_H_
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
#ifdef __FreeBSD__
#include <sys/socket.h>
#include <sys/un.h>
#endif
static inline int do_fallocate(int fd, int mode, off_t offset, off_t length)
{
#ifdef HAVE_FALLOCATE
if (fallocate(fd, mode, offset, length) == -1)
return -errno;
return 0;
#else // HAVE_FALLOCATE
#ifdef HAVE_POSIX_FALLOCATE
if (mode == 0)
return -posix_fallocate(fd, offset, length);
#endif
#ifdef HAVE_FSPACECTL
// 0x3 == FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE
if (mode == 0x3) {
struct spacectl_range sr;
sr.r_offset = offset;
sr.r_len = length;
if (fspacectl(fd, SPACECTL_DEALLOC, &sr, 0, NULL) == -1)
return -errno;
return 0;
}
#endif
return -EOPNOTSUPP;
#endif // HAVE_FALLOCATE
}
/*
* Creates files on the underlying file system in response to a FUSE_MKNOD
* operation
*/
static inline int mknod_wrapper(int dirfd, const char *path, const char *link,
int mode, dev_t rdev)
{
int res;
if (S_ISREG(mode)) {
res = openat(dirfd, path, O_CREAT | O_EXCL | O_WRONLY, mode);
if (res >= 0)
res = close(res);
} else if (S_ISDIR(mode)) {
res = mkdirat(dirfd, path, mode);
} else if (S_ISLNK(mode) && link != NULL) {
res = symlinkat(link, dirfd, path);
} else if (S_ISFIFO(mode)) {
res = mkfifoat(dirfd, path, mode);
#ifdef __FreeBSD__
} else if (S_ISSOCK(mode)) {
struct sockaddr_un su;
int fd;
if (strlen(path) >= sizeof(su.sun_path)) {
errno = ENAMETOOLONG;
return -1;
}
fd = socket(AF_UNIX, SOCK_STREAM, 0);
if (fd >= 0) {
/*
* We must bind the socket to the underlying file
* system to create the socket file, even though
* we'll never listen on this socket.
*/
su.sun_family = AF_UNIX;
strncpy(su.sun_path, path, sizeof(su.sun_path));
res = bindat(dirfd, fd, (struct sockaddr*)&su,
sizeof(su));
if (res == 0)
close(fd);
} else {
res = -1;
}
#endif
} else {
res = mknodat(dirfd, path, mode, rdev);
}
return res;
}
#endif // FUSE_PASSTHROUGH_HELPERS_H_
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