| /* |
| FUSE: Filesystem in Userspace |
| Copyright (C) 2005-2008 Csaba Henk <csaba.henk@creo.hu> |
| |
| Architecture specific file system mounting (FreeBSD). |
| |
| This program can be distributed under the terms of the GNU LGPLv2. |
| See the file COPYING.LIB. |
| */ |
| |
| #include "config.h" |
| #include "fuse_i.h" |
| #include "fuse_misc.h" |
| #include "fuse_opt.h" |
| |
| #include <sys/stat.h> |
| #include <sys/wait.h> |
| #include <sys/sysctl.h> |
| #include <sys/user.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| #include <stddef.h> |
| #include <fcntl.h> |
| #include <errno.h> |
| #include <string.h> |
| #include <paths.h> |
| #include <limits.h> |
| |
| #define FUSERMOUNT_PROG "mount_fusefs" |
| #define FUSE_DEV_TRUNK "/dev/fuse" |
| |
| enum { |
| KEY_RO, |
| KEY_KERN |
| }; |
| |
| struct mount_opts { |
| int allow_other; |
| char *kernel_opts; |
| unsigned max_read; |
| }; |
| |
| #define FUSE_DUAL_OPT_KEY(templ, key) \ |
| FUSE_OPT_KEY(templ, key), FUSE_OPT_KEY("no" templ, key) |
| |
| static const struct fuse_opt fuse_mount_opts[] = { |
| { "allow_other", offsetof(struct mount_opts, allow_other), 1 }, |
| { "max_read=%u", offsetof(struct mount_opts, max_read), 1 }, |
| FUSE_OPT_KEY("-r", KEY_RO), |
| /* standard FreeBSD mount options */ |
| FUSE_DUAL_OPT_KEY("dev", KEY_KERN), |
| FUSE_DUAL_OPT_KEY("async", KEY_KERN), |
| FUSE_DUAL_OPT_KEY("atime", KEY_KERN), |
| FUSE_DUAL_OPT_KEY("dev", KEY_KERN), |
| FUSE_DUAL_OPT_KEY("exec", KEY_KERN), |
| FUSE_DUAL_OPT_KEY("suid", KEY_KERN), |
| FUSE_DUAL_OPT_KEY("symfollow", KEY_KERN), |
| FUSE_DUAL_OPT_KEY("rdonly", KEY_KERN), |
| FUSE_DUAL_OPT_KEY("sync", KEY_KERN), |
| FUSE_DUAL_OPT_KEY("union", KEY_KERN), |
| FUSE_DUAL_OPT_KEY("userquota", KEY_KERN), |
| FUSE_DUAL_OPT_KEY("groupquota", KEY_KERN), |
| FUSE_DUAL_OPT_KEY("clusterr", KEY_KERN), |
| FUSE_DUAL_OPT_KEY("clusterw", KEY_KERN), |
| FUSE_DUAL_OPT_KEY("suiddir", KEY_KERN), |
| FUSE_DUAL_OPT_KEY("snapshot", KEY_KERN), |
| FUSE_DUAL_OPT_KEY("multilabel", KEY_KERN), |
| FUSE_DUAL_OPT_KEY("acls", KEY_KERN), |
| FUSE_DUAL_OPT_KEY("force", KEY_KERN), |
| FUSE_DUAL_OPT_KEY("update", KEY_KERN), |
| FUSE_DUAL_OPT_KEY("ro", KEY_KERN), |
| FUSE_DUAL_OPT_KEY("rw", KEY_KERN), |
| FUSE_DUAL_OPT_KEY("auto", KEY_KERN), |
| /* options supported under both Linux and FBSD */ |
| FUSE_DUAL_OPT_KEY("allow_other", KEY_KERN), |
| FUSE_DUAL_OPT_KEY("default_permissions",KEY_KERN), |
| FUSE_OPT_KEY("max_read=", KEY_KERN), |
| FUSE_OPT_KEY("subtype=", KEY_KERN), |
| /* FBSD FUSE specific mount options */ |
| FUSE_DUAL_OPT_KEY("private", KEY_KERN), |
| FUSE_DUAL_OPT_KEY("neglect_shares", KEY_KERN), |
| FUSE_DUAL_OPT_KEY("push_symlinks_in", KEY_KERN), |
| FUSE_OPT_KEY("nosync_unmount", KEY_KERN), |
| /* stock FBSD mountopt parsing routine lets anything be negated... */ |
| /* |
| * Linux specific mount options, but let just the mount util |
| * handle them |
| */ |
| FUSE_OPT_KEY("fsname=", KEY_KERN), |
| FUSE_OPT_END |
| }; |
| |
| void fuse_mount_version(void) |
| { |
| system(FUSERMOUNT_PROG " --version"); |
| } |
| |
| unsigned get_max_read(struct mount_opts *o) |
| { |
| return o->max_read; |
| } |
| |
| static int fuse_mount_opt_proc(void *data, const char *arg, int key, |
| struct fuse_args *outargs) |
| { |
| struct mount_opts *mo = data; |
| |
| switch (key) { |
| case KEY_RO: |
| arg = "ro"; |
| /* fall through */ |
| |
| case KEY_KERN: |
| return fuse_opt_add_opt(&mo->kernel_opts, arg); |
| } |
| |
| /* Pass through unknown options */ |
| return 1; |
| } |
| |
| static void do_unmount(char *dev, int fd) |
| { |
| char device_path[SPECNAMELEN + 12]; |
| const char *argv[4]; |
| const char umount_cmd[] = "/sbin/umount"; |
| pid_t pid; |
| |
| snprintf(device_path, SPECNAMELEN + 12, _PATH_DEV "%s", dev); |
| |
| argv[0] = umount_cmd; |
| argv[1] = "-f"; |
| argv[2] = device_path; |
| argv[3] = NULL; |
| |
| pid = fork(); |
| |
| if (pid == -1) |
| return; |
| |
| if (pid == 0) { |
| close(fd); |
| execvp(umount_cmd, (char **)argv); |
| exit(1); |
| } |
| |
| waitpid(pid, NULL, 0); |
| } |
| |
| void fuse_kern_unmount(const char *mountpoint, int fd) |
| { |
| char *ep, dev[128]; |
| struct stat sbuf; |
| |
| (void)mountpoint; |
| |
| if (fstat(fd, &sbuf) == -1) |
| goto out; |
| |
| devname_r(sbuf.st_rdev, S_IFCHR, dev, 128); |
| |
| if (strncmp(dev, "fuse", 4)) |
| goto out; |
| |
| strtol(dev + 4, &ep, 10); |
| if (*ep != '\0') |
| goto out; |
| |
| do_unmount(dev, fd); |
| |
| out: |
| close(fd); |
| } |
| |
| /* Check if kernel is doing init in background */ |
| static int init_backgrounded(void) |
| { |
| unsigned ibg, len; |
| |
| len = sizeof(ibg); |
| |
| if (sysctlbyname("vfs.fuse.init_backgrounded", &ibg, &len, NULL, 0)) |
| return 0; |
| |
| return ibg; |
| } |
| |
| |
| static int fuse_mount_core(const char *mountpoint, const char *opts) |
| { |
| const char *mountprog = FUSERMOUNT_PROG; |
| int fd; |
| char *fdnam, *dev; |
| pid_t pid, cpid; |
| int status; |
| |
| fdnam = getenv("FUSE_DEV_FD"); |
| |
| if (fdnam) { |
| char *ep; |
| |
| fd = strtol(fdnam, &ep, 10); |
| |
| if (*ep != '\0') { |
| fprintf(stderr, "invalid value given in FUSE_DEV_FD\n"); |
| return -1; |
| } |
| |
| if (fd < 0) |
| return -1; |
| |
| goto mount; |
| } |
| |
| dev = getenv("FUSE_DEV_NAME"); |
| |
| if (! dev) |
| dev = (char *)FUSE_DEV_TRUNK; |
| |
| if ((fd = open(dev, O_RDWR)) < 0) { |
| perror("fuse: failed to open fuse device"); |
| return -1; |
| } |
| |
| mount: |
| if (getenv("FUSE_NO_MOUNT") || ! mountpoint) |
| goto out; |
| |
| pid = fork(); |
| cpid = pid; |
| |
| if (pid == -1) { |
| perror("fuse: fork() failed"); |
| close(fd); |
| return -1; |
| } |
| |
| if (pid == 0) { |
| if (! init_backgrounded()) { |
| /* |
| * If init is not backgrounded, we have to |
| * call the mount util backgrounded, to avoid |
| * deadlock. |
| */ |
| |
| pid = fork(); |
| |
| if (pid == -1) { |
| perror("fuse: fork() failed"); |
| close(fd); |
| exit(1); |
| } |
| } |
| |
| if (pid == 0) { |
| const char *argv[32]; |
| int a = 0; |
| |
| if (! fdnam && asprintf(&fdnam, "%d", fd) == -1) { |
| perror("fuse: failed to assemble mount arguments"); |
| exit(1); |
| } |
| |
| argv[a++] = mountprog; |
| if (opts) { |
| argv[a++] = "-o"; |
| argv[a++] = opts; |
| } |
| argv[a++] = fdnam; |
| argv[a++] = mountpoint; |
| argv[a++] = NULL; |
| execvp(mountprog, (char **) argv); |
| perror("fuse: failed to exec mount program"); |
| exit(1); |
| } |
| |
| exit(0); |
| } |
| |
| if (waitpid(cpid, &status, 0) == -1 || WEXITSTATUS(status) != 0) { |
| perror("fuse: failed to mount file system"); |
| close(fd); |
| return -1; |
| } |
| |
| out: |
| return fd; |
| } |
| |
| struct mount_opts *parse_mount_opts(struct fuse_args *args) |
| { |
| struct mount_opts *mo; |
| |
| mo = (struct mount_opts*) malloc(sizeof(struct mount_opts)); |
| if (mo == NULL) |
| return NULL; |
| |
| memset(mo, 0, sizeof(struct mount_opts)); |
| |
| if (args && |
| fuse_opt_parse(args, mo, fuse_mount_opts, fuse_mount_opt_proc) == -1) |
| goto err_out; |
| |
| return mo; |
| |
| err_out: |
| destroy_mount_opts(mo); |
| return NULL; |
| } |
| |
| void destroy_mount_opts(struct mount_opts *mo) |
| { |
| free(mo->kernel_opts); |
| free(mo); |
| } |
| |
| int fuse_kern_mount(const char *mountpoint, struct mount_opts *mo) |
| { |
| /* mount util should not try to spawn the daemon */ |
| setenv("MOUNT_FUSEFS_SAFE", "1", 1); |
| /* to notify the mount util it's called from lib */ |
| setenv("MOUNT_FUSEFS_CALL_BY_LIB", "1", 1); |
| |
| return fuse_mount_core(mountpoint, mo->kernel_opts); |
| } |