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/*
FUSE: Filesystem in Userspace Copyright (C) 2001-2007 Miklos Szeredi <miklos@szeredi.hu> Copyright (C) 2011 Sebastian Pipping <sebastian@pipping.org>
This program can be distributed under the terms of the GNU GPL. See the file COPYING.
gcc -Wall fusexmp.c `pkg-config fuse --cflags --libs` -o fusexmp*/
#define FUSE_USE_VERSION 26
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef linux
/* For pread()/pwrite()/utimensat() */#define _XOPEN_SOURCE 700
#endif
#include <fuse.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <dirent.h>
#include <errno.h>
#include <sys/time.h>
#ifdef HAVE_SETXATTR
#include <sys/xattr.h>
#endif
static int xmp_getattr(const char *path, struct stat *stbuf){ int res;
res = lstat(path, stbuf); if (res == -1) return -errno;
return 0;}
static int xmp_access(const char *path, int mask){ int res;
res = access(path, mask); if (res == -1) return -errno;
return 0;}
static int xmp_readlink(const char *path, char *buf, size_t size){ int res;
res = readlink(path, buf, size - 1); if (res == -1) return -errno;
buf[res] = '\0'; return 0;}
static int xmp_readdir(const char *path, void *buf, fuse_fill_dir_t filler, off_t offset, struct fuse_file_info *fi){ DIR *dp; struct dirent *de;
(void) offset; (void) fi;
dp = opendir(path); if (dp == NULL) return -errno;
while ((de = readdir(dp)) != NULL) { struct stat st; memset(&st, 0, sizeof(st)); st.st_ino = de->d_ino; st.st_mode = de->d_type << 12; if (filler(buf, de->d_name, &st, 0)) break; }
closedir(dp); return 0;}
static int xmp_mknod(const char *path, mode_t mode, dev_t rdev){ int res;
/* On Linux this could just be 'mknod(path, mode, rdev)' but this
is more portable */ if (S_ISREG(mode)) { res = open(path, O_CREAT | O_EXCL | O_WRONLY, mode); if (res >= 0) res = close(res); } else if (S_ISFIFO(mode)) res = mkfifo(path, mode); else res = mknod(path, mode, rdev); if (res == -1) return -errno;
return 0;}
static int xmp_mkdir(const char *path, mode_t mode){ int res;
res = mkdir(path, mode); if (res == -1) return -errno;
return 0;}
static int xmp_unlink(const char *path){ int res;
res = unlink(path); if (res == -1) return -errno;
return 0;}
static int xmp_rmdir(const char *path){ int res;
res = rmdir(path); if (res == -1) return -errno;
return 0;}
static int xmp_symlink(const char *from, const char *to){ int res;
res = symlink(from, to); if (res == -1) return -errno;
return 0;}
static int xmp_rename(const char *from, const char *to){ int res;
res = rename(from, to); if (res == -1) return -errno;
return 0;}
static int xmp_link(const char *from, const char *to){ int res;
res = link(from, to); if (res == -1) return -errno;
return 0;}
static int xmp_chmod(const char *path, mode_t mode){ int res;
res = chmod(path, mode); if (res == -1) return -errno;
return 0;}
static int xmp_chown(const char *path, uid_t uid, gid_t gid){ int res;
res = lchown(path, uid, gid); if (res == -1) return -errno;
return 0;}
static int xmp_truncate(const char *path, off_t size){ int res;
res = truncate(path, size); if (res == -1) return -errno;
return 0;}
#ifdef HAVE_UTIMENSAT
static int xmp_utimens(const char *path, const struct timespec ts[2]){ int res;
/* don't use utime/utimes since they follow symlinks */ res = utimensat(0, path, ts, AT_SYMLINK_NOFOLLOW); if (res == -1) return -errno;
return 0;}#endif
static int xmp_open(const char *path, struct fuse_file_info *fi){ int res;
res = open(path, fi->flags); if (res == -1) return -errno;
close(res); return 0;}
static int xmp_read(const char *path, char *buf, size_t size, off_t offset, struct fuse_file_info *fi){ int fd; int res;
(void) fi; fd = open(path, O_RDONLY); if (fd == -1) return -errno;
res = pread(fd, buf, size, offset); if (res == -1) res = -errno;
close(fd); return res;}
static int xmp_write(const char *path, const char *buf, size_t size, off_t offset, struct fuse_file_info *fi){ int fd; int res;
(void) fi; fd = open(path, O_WRONLY); if (fd == -1) return -errno;
res = pwrite(fd, buf, size, offset); if (res == -1) res = -errno;
close(fd); return res;}
static int xmp_statfs(const char *path, struct statvfs *stbuf){ int res;
res = statvfs(path, stbuf); if (res == -1) return -errno;
return 0;}
static int xmp_release(const char *path, struct fuse_file_info *fi){ /* Just a stub. This method is optional and can safely be left
unimplemented */
(void) path; (void) fi; return 0;}
static int xmp_fsync(const char *path, int isdatasync, struct fuse_file_info *fi){ /* Just a stub. This method is optional and can safely be left
unimplemented */
(void) path; (void) isdatasync; (void) fi; return 0;}
#ifdef HAVE_POSIX_FALLOCATE
static int xmp_fallocate(const char *path, int mode, off_t offset, off_t length, struct fuse_file_info *fi){ int fd; int res;
(void) fi;
if (mode) return -EOPNOTSUPP;
fd = open(path, O_WRONLY); if (fd == -1) return -errno;
res = -posix_fallocate(fd, offset, length);
close(fd); return res;}#endif
#ifdef HAVE_SETXATTR
/* xattr operations are optional and can safely be left unimplemented */static int xmp_setxattr(const char *path, const char *name, const char *value, size_t size, int flags){ int res = lsetxattr(path, name, value, size, flags); if (res == -1) return -errno; return 0;}
static int xmp_getxattr(const char *path, const char *name, char *value, size_t size){ int res = lgetxattr(path, name, value, size); if (res == -1) return -errno; return res;}
static int xmp_listxattr(const char *path, char *list, size_t size){ int res = llistxattr(path, list, size); if (res == -1) return -errno; return res;}
static int xmp_removexattr(const char *path, const char *name){ int res = lremovexattr(path, name); if (res == -1) return -errno; return 0;}#endif /* HAVE_SETXATTR */
static struct fuse_operations xmp_oper = { .getattr = xmp_getattr, .access = xmp_access, .readlink = xmp_readlink, .readdir = xmp_readdir, .mknod = xmp_mknod, .mkdir = xmp_mkdir, .symlink = xmp_symlink, .unlink = xmp_unlink, .rmdir = xmp_rmdir, .rename = xmp_rename, .link = xmp_link, .chmod = xmp_chmod, .chown = xmp_chown, .truncate = xmp_truncate,#ifdef HAVE_UTIMENSAT
.utimens = xmp_utimens,#endif
.open = xmp_open, .read = xmp_read, .write = xmp_write, .statfs = xmp_statfs, .release = xmp_release, .fsync = xmp_fsync,#ifdef HAVE_POSIX_FALLOCATE
.fallocate = xmp_fallocate,#endif
#ifdef HAVE_SETXATTR
.setxattr = xmp_setxattr, .getxattr = xmp_getxattr, .listxattr = xmp_listxattr, .removexattr = xmp_removexattr,#endif
};
int main(int argc, char *argv[]){ umask(0); return fuse_main(argc, argv, &xmp_oper, NULL);}
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