#define FUSE_USE_VERSION 26
-#include <stdio.h>
+#include <alloca.h>
#include <dirent.h>
+#include <dlfcn.h>
+#include <errno.h>
#include <fcntl.h>
#include <fuse.h>
-#include <unistd.h>
-#include <errno.h>
-#include <stdbool.h>
-#include <time.h>
-#include <string.h>
-#include <stdlib.h>
#include <libgen.h>
-#include <sched.h>
#include <pthread.h>
-#include <dlfcn.h>
+#include <sched.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+#include <wait.h>
#include <linux/sched.h>
-#include <sys/socket.h>
-#include <sys/mount.h>
#include <sys/epoll.h>
-#include <wait.h>
+#include <sys/mount.h>
+#include <sys/socket.h>
+#include <linux/limits.h>
-#include "config.h" // for VERSION
#include "bindings.h"
+#include "config.h" // for VERSION
void *dlopen_handle;
int ret;
if ((ret = pthread_mutex_lock(l)) != 0) {
- fprintf(stderr, "pthread_mutex_lock returned:%d %s\n", ret, strerror(ret));
+ lxcfs_error("returned:%d %s\n", ret, strerror(ret));
exit(1);
}
}
int ret;
if ((ret = pthread_mutex_unlock(l)) != 0) {
- fprintf(stderr, "pthread_mutex_unlock returned:%d %s\n", ret, strerror(ret));
+ lxcfs_error("returned:%d %s\n", ret, strerror(ret));
exit(1);
}
}
unlock_mutex(&user_count_mutex);
}
-static int need_reload;
+static pthread_t loadavg_pid = 0;
+
+/* Returns zero on success */
+static int start_loadavg(void) {
+ char *error;
+ pthread_t (*load_daemon)(int);
+
+ dlerror(); /* Clear any existing error */
+
+ load_daemon = (pthread_t (*)(int)) dlsym(dlopen_handle, "load_daemon");
+ error = dlerror();
+ if (error != NULL) {
+ lxcfs_error("load_daemon fails:%s\n", error);
+ return -1;
+ }
+ loadavg_pid = load_daemon(1);
+ if (loadavg_pid == 0)
+ return -1;
+
+ return 0;
+}
+
+/* Returns zero on success */
+static int stop_loadavg(void) {
+ char *error;
+ int (*stop_load_daemon)(pthread_t);
+
+ stop_load_daemon = (int (*)(pthread_t)) dlsym(dlopen_handle, "stop_load_daemon");
+ error = dlerror();
+ if (error != NULL) {
+ lxcfs_error("stop_load_daemon error: %s\n", error);
+ return -1;
+ }
+
+ if (stop_load_daemon(loadavg_pid) != 0)
+ return -1;
+
+ return 0;
+}
+
+static volatile sig_atomic_t need_reload;
/* do_reload - reload the dynamic library. Done under
* lock and when we know the user_count was 0 */
static void do_reload(void)
{
- if (dlopen_handle)
+ char lxcfs_lib_path[PATH_MAX];
+
+ if (loadavg_pid > 0)
+ stop_loadavg();
+
+ if (dlopen_handle) {
+ lxcfs_debug("%s\n", "Closing liblxcfs.so handle.");
dlclose(dlopen_handle);
+ }
/* First try loading using ld.so */
dlopen_handle = dlopen("liblxcfs.so", RTLD_LAZY);
- if (dlopen_handle)
+ if (dlopen_handle) {
+ lxcfs_debug("%s\n", "Successfully called dlopen() on liblxcfs.so.");
goto good;
+ }
- /* Fall back to loading from /usr/lib/lxcfs/liblxcfs.so */
- dlopen_handle = dlopen(LIBDIR "lxcfs/liblxcfs.so", RTLD_LAZY);
+#ifdef LIBDIR
+ /* LIBDIR: autoconf will setup this MACRO. Default value is $PREFIX/lib */
+ snprintf(lxcfs_lib_path, PATH_MAX, "%s/lxcfs/liblxcfs.so", LIBDIR);
+#else
+ snprintf(lxcfs_lib_path, PATH_MAX, "/usr/local/lib/lxcfs/liblxcfs.so");
+#endif
+ dlopen_handle = dlopen(lxcfs_lib_path, RTLD_LAZY);
if (!dlopen_handle) {
- fprintf(stderr, "Failed to open liblxcfs\n");
+ lxcfs_error("Failed to open liblxcfs.so: %s.\n", dlerror());
_exit(1);
}
good:
+ if (loadavg_pid > 0)
+ start_loadavg();
+
if (need_reload)
- fprintf(stderr, "lxcfs: reloaded\n");
+ lxcfs_error("%s\n", "lxcfs: reloaded");
need_reload = 0;
}
static void reload_handler(int sig)
{
- fprintf(stderr, "lxcfs: caught a SIGUSR1. Reloading\n");
- users_lock();
need_reload = 1;
- users_unlock();
}
/* Functions to run the library methods */
cg_getattr = (int (*)(const char *, struct stat *)) dlsym(dlopen_handle, "cg_getattr");
error = dlerror();
if (error != NULL) {
- fprintf(stderr, "cg_getattr: %s\n", error);
+ lxcfs_error("%s\n", error);
return -1;
}
proc_getattr = (int (*)(const char *, struct stat *)) dlsym(dlopen_handle, "proc_getattr");
error = dlerror();
if (error != NULL) {
- fprintf(stderr, "proc_getattr: %s\n", error);
+ lxcfs_error("%s\n", error);
return -1;
}
cg_read = (int (*)(const char *, char *, size_t, off_t, struct fuse_file_info *)) dlsym(dlopen_handle, "cg_read");
error = dlerror();
if (error != NULL) {
- fprintf(stderr, "cg_read: %s\n", error);
+ lxcfs_error("%s\n", error);
return -1;
}
proc_read = (int (*)(const char *, char *, size_t, off_t, struct fuse_file_info *)) dlsym(dlopen_handle, "proc_read");
error = dlerror();
if (error != NULL) {
- fprintf(stderr, "proc_read: %s\n", error);
+ lxcfs_error("%s\n", error);
return -1;
}
cg_write = (int (*)(const char *, const char *, size_t, off_t, struct fuse_file_info *)) dlsym(dlopen_handle, "cg_write");
error = dlerror();
if (error != NULL) {
- fprintf(stderr, "cg_write: %s\n", error);
+ lxcfs_error("%s\n", error);
return -1;
}
cg_mkdir = (int (*)(const char *, mode_t)) dlsym(dlopen_handle, "cg_mkdir");
error = dlerror();
if (error != NULL) {
- fprintf(stderr, "cg_mkdir: %s\n", error);
+ lxcfs_error("%s\n", error);
return -1;
}
cg_chown = (int (*)(const char *, uid_t, gid_t)) dlsym(dlopen_handle, "cg_chown");
error = dlerror();
if (error != NULL) {
- fprintf(stderr, "cg_chown: %s\n", error);
+ lxcfs_error("%s\n", error);
return -1;
}
cg_rmdir = (int (*)(const char *path)) dlsym(dlopen_handle, "cg_rmdir");
error = dlerror();
if (error != NULL) {
- fprintf(stderr, "cg_rmdir: %s\n", error);
+ lxcfs_error("%s\n", error);
return -1;
}
cg_chmod = (int (*)(const char *, mode_t)) dlsym(dlopen_handle, "cg_chmod");
error = dlerror();
if (error != NULL) {
- fprintf(stderr, "cg_chmod: %s\n", error);
+ lxcfs_error("%s\n", error);
return -1;
}
cg_readdir = (int (*)(const char *, void *, fuse_fill_dir_t, off_t, struct fuse_file_info *)) dlsym(dlopen_handle, "cg_readdir");
error = dlerror();
if (error != NULL) {
- fprintf(stderr, "cg_readdir: %s\n", error);
+ lxcfs_error("%s\n", error);
return -1;
}
proc_readdir = (int (*)(const char *, void *, fuse_fill_dir_t, off_t, struct fuse_file_info *)) dlsym(dlopen_handle, "proc_readdir");
error = dlerror();
if (error != NULL) {
- fprintf(stderr, "proc_readdir: %s\n", error);
+ lxcfs_error("%s\n", error);
return -1;
}
cg_open = (int (*)(const char *, struct fuse_file_info *)) dlsym(dlopen_handle, "cg_open");
error = dlerror();
if (error != NULL) {
- fprintf(stderr, "cg_open: %s\n", error);
+ lxcfs_error("%s\n", error);
return -1;
}
return cg_open(path, fi);
}
+static int do_cg_access(const char *path, int mode)
+{
+ int (*cg_access)(const char *path, int mode);
+ char *error;
+ dlerror(); /* Clear any existing error */
+ cg_access = (int (*)(const char *, int mode)) dlsym(dlopen_handle, "cg_access");
+ error = dlerror();
+ if (error != NULL) {
+ lxcfs_error("%s\n", error);
+ return -1;
+ }
+
+ return cg_access(path, mode);
+}
+
static int do_proc_open(const char *path, struct fuse_file_info *fi)
{
int (*proc_open)(const char *path, struct fuse_file_info *fi);
proc_open = (int (*)(const char *path, struct fuse_file_info *fi)) dlsym(dlopen_handle, "proc_open");
error = dlerror();
if (error != NULL) {
- fprintf(stderr, "proc_open: %s\n", error);
+ lxcfs_error("%s\n", error);
return -1;
}
return proc_open(path, fi);
}
+static int do_proc_access(const char *path, int mode)
+{
+ int (*proc_access)(const char *path, int mode);
+ char *error;
+ dlerror(); /* Clear any existing error */
+ proc_access = (int (*)(const char *, int mode)) dlsym(dlopen_handle, "proc_access");
+ error = dlerror();
+ if (error != NULL) {
+ lxcfs_error("%s\n", error);
+ return -1;
+ }
+
+ return proc_access(path, mode);
+}
+
static int do_cg_release(const char *path, struct fuse_file_info *fi)
{
int (*cg_release)(const char *path, struct fuse_file_info *fi);
cg_release = (int (*)(const char *path, struct fuse_file_info *)) dlsym(dlopen_handle, "cg_release");
error = dlerror();
if (error != NULL) {
- fprintf(stderr, "cg_release: %s\n", error);
+ lxcfs_error("%s\n", error);
return -1;
}
proc_release = (int (*)(const char *path, struct fuse_file_info *)) dlsym(dlopen_handle, "proc_release");
error = dlerror();
if (error != NULL) {
- fprintf(stderr, "proc_release: %s\n", error);
+ lxcfs_error("%s\n", error);
return -1;
}
cg_opendir = (int (*)(const char *path, struct fuse_file_info *fi)) dlsym(dlopen_handle, "cg_opendir");
error = dlerror();
if (error != NULL) {
- fprintf(stderr, "cg_opendir: %s\n", error);
+ lxcfs_error("%s\n", error);
return -1;
}
cg_releasedir = (int (*)(const char *path, struct fuse_file_info *)) dlsym(dlopen_handle, "cg_releasedir");
error = dlerror();
if (error != NULL) {
- fprintf(stderr, "cg_releasedir: %s\n", error);
+ lxcfs_error("%s\n", error);
return -1;
}
static int lxcfs_getattr(const char *path, struct stat *sb)
{
int ret;
+ struct timespec now;
+
if (strcmp(path, "/") == 0) {
+ if (clock_gettime(CLOCK_REALTIME, &now) < 0)
+ return -EINVAL;
+ sb->st_uid = sb->st_gid = 0;
+ sb->st_atim = sb->st_mtim = sb->st_ctim = now;
+ sb->st_size = 0;
sb->st_mode = S_IFDIR | 00755;
sb->st_nlink = 2;
return 0;
}
+
if (strncmp(path, "/cgroup", 7) == 0) {
up_users();
ret = do_cg_getattr(path, sb);
down_users();
return ret;
}
- return -EINVAL;
+ return -ENOENT;
}
static int lxcfs_opendir(const char *path, struct fuse_file_info *fi)
{
int ret;
if (strcmp(path, "/") == 0) {
- if (filler(buf, "proc", NULL, 0) != 0 ||
- filler(buf, "cgroup", NULL, 0) != 0)
- return -EINVAL;
+ if (filler(buf, ".", NULL, 0) != 0 ||
+ filler(buf, "..", NULL, 0) != 0 ||
+ filler(buf, "proc", NULL, 0) != 0 ||
+ filler(buf, "cgroup", NULL, 0) != 0)
+ return -ENOMEM;
return 0;
}
if (strncmp(path, "/cgroup", 7) == 0) {
down_users();
return ret;
}
- return -EINVAL;
+ return -ENOENT;
+}
+
+static int lxcfs_access(const char *path, int mode)
+{
+ int ret;
+
+ if (strcmp(path, "/") == 0 && (mode & W_OK) == 0)
+ return 0;
+
+ if (strncmp(path, "/cgroup", 7) == 0) {
+ up_users();
+ ret = do_cg_access(path, mode);
+ down_users();
+ return ret;
+ }
+ if (strncmp(path, "/proc", 5) == 0) {
+ up_users();
+ ret = do_proc_access(path, mode);
+ down_users();
+ return ret;
+ }
+
+ return -EACCES;
}
static int lxcfs_releasedir(const char *path, struct fuse_file_info *fi)
return ret;
}
- return -EINVAL;
+ return -EACCES;
}
static int lxcfs_read(const char *path, char *buf, size_t size, off_t offset,
return ret;
}
- return -EINVAL;
+ return -EPERM;
}
int lxcfs_chown(const char *path, uid_t uid, gid_t gid)
return ret;
}
- return -EINVAL;
+ if (strncmp(path, "/proc", 5) == 0)
+ return -EPERM;
+
+ return -ENOENT;
}
/*
{
if (strncmp(path, "/cgroup", 7) == 0)
return 0;
- return -EINVAL;
+ return -EPERM;
}
int lxcfs_rmdir(const char *path)
down_users();
return ret;
}
- return -EINVAL;
+ return -EPERM;
}
int lxcfs_chmod(const char *path, mode_t mode)
down_users();
return ret;
}
- return -EINVAL;
+
+ if (strncmp(path, "/proc", 5) == 0)
+ return -EPERM;
+
+ return -ENOENT;
}
const struct fuse_operations lxcfs_ops = {
.fsyncdir = NULL,
.init = NULL,
.destroy = NULL,
- .access = NULL,
+ .access = lxcfs_access,
.create = NULL,
.ftruncate = NULL,
.fgetattr = NULL,
};
-static void usage(const char *me)
+static void usage()
{
fprintf(stderr, "Usage:\n");
fprintf(stderr, "\n");
- fprintf(stderr, "%s [-p pidfile] mountpoint\n", me);
+ fprintf(stderr, "lxcfs [-f|-d] -l [-p pidfile] mountpoint\n");
+ fprintf(stderr, " -f running foreground by default; -d enable debug output \n");
+ fprintf(stderr, " -l use loadavg \n");
fprintf(stderr, " Default pidfile is %s/lxcfs.pid\n", RUNTIME_PATH);
- fprintf(stderr, "%s -h\n", me);
+ fprintf(stderr, "lxcfs -h\n");
exit(1);
}
return false;
}
-void swallow_arg(int *argcp, char *argv[], char *which)
+bool swallow_arg(int *argcp, char *argv[], char *which)
{
int i;
argv[i] = argv[i+1];
}
(*argcp)--;
- return;
+ return true;
}
+ return false;
}
bool swallow_option(int *argcp, char *argv[], char *opt, char **v)
return false;
}
-static bool mkdir_p(const char *dir, mode_t mode)
-{
- const char *tmp = dir;
- const char *orig = dir;
- char *makeme;
-
- do {
- dir = tmp + strspn(tmp, "/");
- tmp = dir + strcspn(dir, "/");
- makeme = strndup(orig, dir - orig);
- if (!makeme)
- return false;
- if (mkdir(makeme, mode) && errno != EEXIST) {
- fprintf(stderr, "failed to create directory '%s': %s",
- makeme, strerror(errno));
- free(makeme);
- return false;
- }
- free(makeme);
- } while(tmp != dir);
-
- return true;
-}
-
-static bool umount_if_mounted(void)
-{
- if (umount2(basedir, MNT_DETACH) < 0 && errno != EINVAL) {
- fprintf(stderr, "failed to umount %s: %s\n", basedir,
- strerror(errno));
- return false;
- }
- return true;
-}
-
-static bool setup_cgfs_dir(void)
-{
- if (!mkdir_p(basedir, 0700)) {
- fprintf(stderr, "Failed to create lxcfs cgdir\n");
- return false;
- }
- if (!umount_if_mounted()) {
- fprintf(stderr, "Failed to clean up old lxcfs cgdir\n");
- return false;
- }
- if (mount("tmpfs", basedir, "tmpfs", 0, "size=100000,mode=700") < 0) {
- fprintf(stderr, "Failed to mount tmpfs for private controllers\n");
- return false;
- }
- return true;
-}
-
-static bool do_mount_cgroup(char *controller)
-{
- char *target;
- size_t len;
- int ret;
-
- len = strlen(basedir) + strlen(controller) + 2;
- target = alloca(len);
- ret = snprintf(target, len, "%s/%s", basedir, controller);
- if (ret < 0 || ret >= len)
- return false;
- if (mkdir(target, 0755) < 0 && errno != EEXIST)
- return false;
- if (mount(controller, target, "cgroup", 0, controller) < 0) {
- fprintf(stderr, "Failed mounting cgroup %s\n", controller);
- return false;
- }
- return true;
-}
-
-static bool do_mount_cgroups(void)
-{
- bool ret;
- FILE *f;
- char *line = NULL;
- size_t len = 0;
-
- if ((f = fopen("/proc/self/cgroup", "r")) == NULL) {
- fprintf(stderr, "Error opening /proc/self/cgroup: %s\n", strerror(errno));
- return false;
- }
-
- while (getline(&line, &len, f) != -1) {
- char *p, *p2;
-
- p = strchr(line, ':');
- if (!p)
- goto out;
- *(p++) = '\0';
-
- p2 = strrchr(p, ':');
- if (!p2)
- goto out;
- *p2 = '\0';
-
- if (!do_mount_cgroup(p))
- goto out;
- }
- ret = true;
-
-out:
- free(line);
- fclose(f);
- return ret;
-}
-
-static bool cgfs_setup_controllers(void)
-{
- if (!setup_cgfs_dir()) {
- return false;
- }
-
- if (!do_mount_cgroups()) {
- fprintf(stderr, "Failed to set up cgroup mounts\n");
- return false;
- }
-
- return true;
-}
-
static int set_pidfile(char *pidfile)
{
int fd;
fd = open(pidfile, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR);
if (fd == -1) {
- fprintf(stderr, "Could not open pidfile %s: %m", pidfile);
+ fprintf(stderr, "Could not open pidfile %s: %m\n", pidfile);
return -1;
}
int main(int argc, char *argv[])
{
- int ret = -1, pidfd;
- char *pidfile = NULL, *v = NULL;
+ int ret = EXIT_FAILURE;
+ int pidfd = -1;
+ char *pidfile = NULL, *saveptr = NULL, *token = NULL, *v = NULL;
size_t pidfile_len;
+ bool debug = false, nonempty = false;
+ bool load_use = false;
/*
* what we pass to fuse_main is:
- * argv[0] -s -f -o allow_other,directio argv[1] NULL
+ * argv[0] -s [-f|-d] -o allow_other,directio argv[1] NULL
*/
int nargs = 5, cnt = 0;
char *newargv[6];
/* accomodate older init scripts */
swallow_arg(&argc, argv, "-s");
swallow_arg(&argc, argv, "-f");
+ debug = swallow_arg(&argc, argv, "-d");
+ if (swallow_arg(&argc, argv, "-l")) {
+ load_use = true;
+ }
if (swallow_option(&argc, argv, "-o", &v)) {
- if (strcmp(v, "allow_other") != 0) {
- fprintf(stderr, "Warning: unexpected fuse option %s\n", v);
- exit(1);
+ /* Parse multiple values */
+ for (; (token = strtok_r(v, ",", &saveptr)); v = NULL) {
+ if (strcmp(token, "allow_other") == 0) {
+ /* Noop. this is the default. Always enabled. */
+ } else if (strcmp(token, "nonempty") == 0) {
+ nonempty = true;
+ } else {
+ free(v);
+ fprintf(stderr, "Warning: unexpected fuse option %s\n", v);
+ exit(EXIT_FAILURE);
+ }
}
free(v);
v = NULL;
if (argc == 2 && strcmp(argv[1], "--version") == 0) {
fprintf(stderr, "%s\n", VERSION);
- exit(0);
+ exit(EXIT_SUCCESS);
}
if (argc != 2 || is_help(argv[1]))
- usage(argv[0]);
+ usage();
do_reload();
- signal(SIGUSR1, reload_handler);
+ if (signal(SIGUSR1, reload_handler) == SIG_ERR) {
+ fprintf(stderr, "Error setting USR1 signal handler: %m\n");
+ goto out;
+ }
newargv[cnt++] = argv[0];
- newargv[cnt++] = "-f";
+ if (debug)
+ newargv[cnt++] = "-d";
+ else
+ newargv[cnt++] = "-f";
newargv[cnt++] = "-o";
- newargv[cnt++] = "allow_other,direct_io,entry_timeout=0.5,attr_timeout=0.5";
+ if (nonempty)
+ newargv[cnt++] = "allow_other,direct_io,entry_timeout=0.5,attr_timeout=0.5,nonempty";
+ else
+ newargv[cnt++] = "allow_other,direct_io,entry_timeout=0.5,attr_timeout=0.5";
newargv[cnt++] = argv[1];
newargv[cnt++] = NULL;
- if (!cgfs_setup_controllers())
- goto out;
-
if (!pidfile) {
pidfile_len = strlen(RUNTIME_PATH) + strlen("/lxcfs.pid") + 1;
pidfile = alloca(pidfile_len);
if ((pidfd = set_pidfile(pidfile)) < 0)
goto out;
- ret = fuse_main(nargs, newargv, &lxcfs_ops, NULL);
+ if (load_use && start_loadavg() != 0)
+ goto out;
- dlclose(dlopen_handle);
- unlink(pidfile);
- close(pidfd);
+ if (!fuse_main(nargs, newargv, &lxcfs_ops, NULL))
+ ret = EXIT_SUCCESS;
+ if (load_use)
+ stop_loadavg();
out:
- return ret;
+ if (dlopen_handle)
+ dlclose(dlopen_handle);
+ if (pidfile)
+ unlink(pidfile);
+ if (pidfd > 0)
+ close(pidfd);
+ exit(ret);
}
projects / mirror_lxcfs.git / blobdiff