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bring in fusermount

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This commit is contained in:
Csaba Henk 2009-08-11 18:26:11 -07:00
parent fbb636390f
commit 901ba842cd
9 changed files with 1454 additions and 8 deletions
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2
Makefile.am
View File

@ -1,6 +1,6 @@
EXTRA_DIST = autogen.sh COPYING INSTALL README AUTHORS THANKS NEWS glusterfs.spec
SUBDIRS = argp-standalone libglusterfs $(LIBGLUSTERFSCLIENT_SUBDIR) xlators scheduler transport auth glusterfsd $(GF_BOOSTER_SUBDIR) doc extras
SUBDIRS = argp-standalone libglusterfs $(LIBGLUSTERFSCLIENT_SUBDIR) xlators scheduler transport auth glusterfsd $(GF_BOOSTER_SUBDIR) $(FUSERMOUNT_SUBDIR) doc extras
CLEANFILES =

24
configure.ac
View File

@ -124,6 +124,8 @@ AC_CONFIG_FILES([Makefile
extras/init.d/glusterfsd-Redhat
extras/init.d/glusterfsd-SuSE
extras/benchmarking/Makefile
contrib/Makefile
contrib/fuse-util/Makefile
glusterfs.spec])
AC_CANONICAL_HOST
@ -216,6 +218,24 @@ AC_SUBST(FUSE_CLIENT_SUBDIR)
# end FUSE section
# FUSERMOUNT section
AC_ARG_ENABLE([fusermount],
AC_HELP_STRING([--enable-fusermount],
[Build fusermount]),
[], [enable_fusermount=no])
BUILD_FUSERMOUNT="no"
if test "x$enable_fusermount" != "xno"; then
FUSERMOUNT_SUBDIR="contrib"
BUILD_FUSERMOUNT="yes"
AC_DEFINE(GF_FUSERMOUNT, 1, [Use our own fusermount])
fi
AC_SUBST(FUSERMOUNT_SUBDIR)
#end FUSERMOUNT section
# EPOLL section
AC_ARG_ENABLE([epoll],
AC_HELP_STRING([--disable-epoll],
@ -454,6 +474,9 @@ AC_SUBST(GF_LDADD)
AC_SUBST(GF_FUSE_LDADD)
AC_SUBST(GF_BOOSTER_SUBDIR)
CONTRIBDIR='$(top_srcdir)/contrib'
AC_SUBST(CONTRIBDIR)
AM_CONDITIONAL([GF_DARWIN_HOST_OS], test "${GF_HOST_OS}" = "GF_DARWIN_HOST_OS")
AC_OUTPUT
@ -467,4 +490,5 @@ echo "epoll IO multiplex : $BUILD_EPOLL"
echo "Berkeley-DB : $BUILD_BDB"
echo "libglusterfsclient : $BUILD_LIBGLUSTERFSCLIENT"
echo "argp-standalone : $BUILD_ARGP_STANDALONE"
echo "fusermount : $BUILD_FUSERMOUNT"
echo

3
contrib/Makefile.am Normal file
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@ -0,0 +1,3 @@
SUBDIRS = fuse-util
CLEANFILES =

94
contrib/fuse-lib/mount.c
View File

@ -7,28 +7,46 @@
See the file COPYING.LIB.
*/
#ifndef _CONFIG_H
#define _CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <stddef.h>
#include <limits.h>
#include <fcntl.h>
#include <errno.h>
#include <dirent.h>
#include <mntent.h>
#include <sys/stat.h>
#include <sys/poll.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/wait.h>
#include <sys/mount.h>
#ifdef FUSE_UTIL
#define MALLOC(size) malloc (size)
#define FREE(ptr) free (ptr)
#define GFFUSE_LOGERR(...) fprintf (stderr, ## __VA_ARGS__)
#else /* FUSE_UTIL */
#include "glusterfs.h"
#include "logging.h"
#include "common-utils.h"
#ifdef GF_FUSERMOUNT
#define FUSERMOUNT_PROG FUSERMOUNT_DIR "/fusermount-glusterfs"
#else
#define FUSERMOUNT_PROG "fusermount"
#endif
#define FUSE_COMMFD_ENV "_FUSE_COMMFD"
#define GFFUSE_LOGERR(...) \
gf_log ("glusterfs-fuse", GF_LOG_ERROR, ## __VA_ARGS__)
#endif /* !FUSE_UTIL */
/*
* Functions below, until following note, were taken from libfuse
@ -74,7 +92,10 @@ mtab_needs_update (const char *mnt)
return 1;
}
static int
#ifndef FUSE_UTIL
static
#endif
int
fuse_mnt_add_mount (const char *progname, const char *fsname,
const char *mnt, const char *type, const char *opts)
{
@ -141,7 +162,10 @@ fuse_mnt_add_mount (const char *progname, const char *fsname,
return res;
}
static char
#ifndef FUSE_UTIL
static
#endif
char
*fuse_mnt_resolve_path (const char *progname, const char *orig)
{
char buf[PATH_MAX];
@ -208,6 +232,7 @@ static char
return dst;
}
#ifndef FUSE_UTIL
/* return value:
* >= 0 => fd
* -1 => error
@ -305,8 +330,12 @@ fuse_mount_fusermount (const char *mountpoint, const char *opts)
return rv;
}
#endif
static int
#ifndef FUSE_UTIL
static
#endif
int
fuse_mnt_umount (const char *progname, const char *mnt, int lazy)
{
int res;
@ -357,6 +386,62 @@ fuse_mnt_umount (const char *progname, const char *mnt, int lazy)
return res;
}
#ifdef FUSE_UTIL
int
fuse_mnt_check_empty (const char *progname, const char *mnt,
mode_t rootmode, off_t rootsize)
{
int isempty = 1;
if (S_ISDIR (rootmode)) {
struct dirent *ent;
DIR *dp = opendir (mnt);
if (dp == NULL) {
fprintf (stderr,
"%s: failed to open mountpoint for reading: %s\n",
progname, strerror (errno));
return -1;
}
while ((ent = readdir (dp)) != NULL) {
if (strcmp (ent->d_name, ".") != 0 &&
strcmp (ent->d_name, "..") != 0) {
isempty = 0;
break;
}
}
closedir (dp);
} else if (rootsize)
isempty = 0;
if (!isempty) {
fprintf (stderr, "%s: mountpoint is not empty\n", progname);
fprintf (stderr, "%s: if you are sure this is safe, "
"use the 'nonempty' mount option\n", progname);
return -1;
}
return 0;
}
int
fuse_mnt_check_fuseblk (void)
{
char buf[256];
FILE *f = fopen ("/proc/filesystems", "r");
if (!f)
return 1;
while (fgets (buf, sizeof (buf), f))
if (strstr (buf, "fuseblk\n")) {
fclose (f);
return 1;
}
fclose (f);
return 0;
}
#endif
#ifndef FUSE_UTIL
void
gf_fuse_unmount (const char *mountpoint, int fd)
{
@ -404,11 +489,13 @@ gf_fuse_unmount (const char *mountpoint, int fd)
}
waitpid (pid, NULL, 0);
}
#endif
/*
* Functions below are loosely modelled after similar functions of libfuse
*/
#ifndef FUSE_UTIL
static int
fuse_mount_sys (const char *mountpoint, char *fsname, char *mnt_param)
{
@ -526,3 +613,4 @@ gf_fuse_mount (const char *mountpoint, char *fsname, char *mnt_param)
return fd;
}
#endif

340
contrib/fuse-util/COPYING Normal file
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@ -0,0 +1,340 @@
GNU GENERAL PUBLIC LICENSE
Version 2, June 1991
Copyright (C) 1989, 1991 Free Software Foundation, Inc.
59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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12
contrib/fuse-util/Makefile.am Normal file
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@ -0,0 +1,12 @@
bin_PROGRAMS = fusermount-glusterfs
fusermount_glusterfs_SOURCES = fusermount.c $(CONTRIBDIR)/fuse-lib/mount.c
noinst_HEADERS = mount_util.h
AM_CFLAGS = -Wall -D_FILE_OFFSET_BITS=64 -DFUSE_UTIL $(GF_CFLAGS)
install-exec-hook:
chown root $(DESTDIR)$(bindir)/fusermount-glusterfs
chmod u+s $(DESTDIR)$(bindir)/fusermount-glusterfs
CLEANFILES =

965
contrib/fuse-util/fusermount.c Normal file
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@ -0,0 +1,965 @@
/*
FUSE: Filesystem in Userspace
Copyright (C) 2001-2007 Miklos Szeredi <miklos@szeredi.hu>
This program can be distributed under the terms of the GNU GPL.
See the file COPYING.
*/
/* This program does the mounting and unmounting of FUSE filesystems */
#include <config.h>
#include "mount_util.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <unistd.h>
#include <getopt.h>
#include <errno.h>
#include <fcntl.h>
#include <pwd.h>
#include <mntent.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <sys/mount.h>
#include <sys/fsuid.h>
#include <sys/socket.h>
#include <sys/utsname.h>
#define FUSE_COMMFD_ENV "_FUSE_COMMFD"
#define FUSE_DEV_OLD "/proc/fs/fuse/dev"
#define FUSE_DEV_NEW "/dev/fuse"
#define FUSE_VERSION_FILE_OLD "/proc/fs/fuse/version"
#define FUSE_CONF "/etc/fuse.conf"
#ifndef MS_DIRSYNC
#define MS_DIRSYNC 128
#endif
static const char *progname;
static int user_allow_other = 0;
static int mount_max = 1000;
static const char *get_user_name(void)
{
struct passwd *pw = getpwuid(getuid());
if (pw != NULL && pw->pw_name != NULL)
return pw->pw_name;
else {
fprintf(stderr, "%s: could not determine username\n", progname);
return NULL;
}
}
static uid_t oldfsuid;
static gid_t oldfsgid;
static void drop_privs(void)
{
if (getuid() != 0) {
oldfsuid = setfsuid(getuid());
oldfsgid = setfsgid(getgid());
}
}
static void restore_privs(void)
{
if (getuid() != 0) {
setfsuid(oldfsuid);
setfsgid(oldfsgid);
}
}
#ifndef IGNORE_MTAB
static int add_mount(const char *source, const char *mnt, const char *type,
const char *opts)
{
return fuse_mnt_add_mount(progname, source, mnt, type, opts);
}
static int unmount_fuse(const char *mnt, int quiet, int lazy)
{
if (getuid() != 0) {
struct mntent *entp;
FILE *fp;
const char *user = NULL;
char uidstr[32];
unsigned uidlen = 0;
int found;
const char *mtab = _PATH_MOUNTED;
user = get_user_name();
if (user == NULL)
return -1;
fp = setmntent(mtab, "r");
if (fp == NULL) {
fprintf(stderr,
"%s: failed to open %s: %s\n", progname, mtab,
strerror(errno));
return -1;
}
uidlen = sprintf(uidstr, "%u", getuid());
found = 0;
while ((entp = getmntent(fp)) != NULL) {
if (!found && strcmp(entp->mnt_dir, mnt) == 0 &&
(strcmp(entp->mnt_type, "fuse") == 0 ||
strcmp(entp->mnt_type, "fuseblk") == 0 ||
strncmp(entp->mnt_type, "fuse.", 5) == 0 ||
strncmp(entp->mnt_type, "fuseblk.", 8) == 0)) {
char *p = strstr(entp->mnt_opts, "user=");
if (p &&
(p == entp->mnt_opts || *(p-1) == ',') &&
strcmp(p + 5, user) == 0) {
found = 1;
break;
}
/* /etc/mtab is a link pointing to
/proc/mounts: */
else if ((p =
strstr(entp->mnt_opts, "user_id=")) &&
(p == entp->mnt_opts ||
*(p-1) == ',') &&
strncmp(p + 8, uidstr, uidlen) == 0 &&
(*(p+8+uidlen) == ',' ||
*(p+8+uidlen) == '\0')) {
found = 1;
break;
}
}
}
endmntent(fp);
if (!found) {
if (!quiet)
fprintf(stderr,
"%s: entry for %s not found in %s\n",
progname, mnt, mtab);
return -1;
}
}
return fuse_mnt_umount(progname, mnt, lazy);
}
static int count_fuse_fs(void)
{
struct mntent *entp;
int count = 0;
const char *mtab = _PATH_MOUNTED;
FILE *fp = setmntent(mtab, "r");
if (fp == NULL) {
fprintf(stderr, "%s: failed to open %s: %s\n", progname, mtab,
strerror(errno));
return -1;
}
while ((entp = getmntent(fp)) != NULL) {
if (strcmp(entp->mnt_type, "fuse") == 0 ||
strncmp(entp->mnt_type, "fuse.", 5) == 0)
count ++;
}
endmntent(fp);
return count;
}
#else /* IGNORE_MTAB */
static int count_fuse_fs()
{
return 0;
}
static int add_mount(const char *source, const char *mnt, const char *type,
const char *opts)
{
(void) source;
(void) mnt;
(void) type;
(void) opts;
return 0;
}
static int unmount_fuse(const char *mnt, int quiet, int lazy)
{
return fuse_mnt_umount(progname, mnt, lazy);
}
#endif /* IGNORE_MTAB */
static void strip_line(char *line)
{
char *s = strchr(line, '#');
if (s != NULL)
s[0] = '\0';
for (s = line + strlen(line) - 1;
s >= line && isspace((unsigned char) *s); s--);
s[1] = '\0';
for (s = line; isspace((unsigned char) *s); s++);
if (s != line)
memmove(line, s, strlen(s)+1);
}
static void parse_line(char *line, int linenum)
{
int tmp;
if (strcmp(line, "user_allow_other") == 0)
user_allow_other = 1;
else if (sscanf(line, "mount_max = %i", &tmp) == 1)
mount_max = tmp;
else if(line[0])
fprintf(stderr,
"%s: unknown parameter in %s at line %i: '%s'\n",
progname, FUSE_CONF, linenum, line);
}
static void read_conf(void)
{
FILE *fp = fopen(FUSE_CONF, "r");
if (fp != NULL) {
int linenum = 1;
char line[256];
int isnewline = 1;
while (fgets(line, sizeof(line), fp) != NULL) {
if (isnewline) {
if (line[strlen(line)-1] == '\n') {
strip_line(line);
parse_line(line, linenum);
} else {
isnewline = 0;
}
} else if(line[strlen(line)-1] == '\n') {
fprintf(stderr, "%s: reading %s: line %i too long\n", progname, FUSE_CONF, linenum);
isnewline = 1;
}
if (isnewline)
linenum ++;
}
if (!isnewline) {
fprintf(stderr, "%s: reading %s: missing newline at end of file\n", progname, FUSE_CONF);
}
fclose(fp);
} else if (errno != ENOENT) {
fprintf(stderr, "%s: failed to open %s: %s\n",
progname, FUSE_CONF, strerror(errno));
}
}
static int begins_with(const char *s, const char *beg)
{
if (strncmp(s, beg, strlen(beg)) == 0)
return 1;
else
return 0;
}
struct mount_flags {
const char *opt;
unsigned long flag;
int on;
int safe;
};
static struct mount_flags mount_flags[] = {
{"rw", MS_RDONLY, 0, 1},
{"ro", MS_RDONLY, 1, 1},
{"suid", MS_NOSUID, 0, 0},
{"nosuid", MS_NOSUID, 1, 1},
{"dev", MS_NODEV, 0, 0},
{"nodev", MS_NODEV, 1, 1},
{"exec", MS_NOEXEC, 0, 1},
{"noexec", MS_NOEXEC, 1, 1},
{"async", MS_SYNCHRONOUS, 0, 1},
{"sync", MS_SYNCHRONOUS, 1, 1},
{"atime", MS_NOATIME, 0, 1},
{"noatime", MS_NOATIME, 1, 1},
{"dirsync", MS_DIRSYNC, 1, 1},
{NULL, 0, 0, 0}
};
static int find_mount_flag(const char *s, unsigned len, int *on, int *flag)
{
int i;
for (i = 0; mount_flags[i].opt != NULL; i++) {
const char *opt = mount_flags[i].opt;
if (strlen(opt) == len && strncmp(opt, s, len) == 0) {
*on = mount_flags[i].on;
*flag = mount_flags[i].flag;
if (!mount_flags[i].safe && getuid() != 0) {
*flag = 0;
fprintf(stderr,
"%s: unsafe option %s ignored\n",
progname, opt);
}
return 1;
}
}
return 0;
}
static int add_option(char **optsp, const char *opt, unsigned expand)
{
char *newopts;
if (*optsp == NULL)
newopts = strdup(opt);
else {
unsigned oldsize = strlen(*optsp);
unsigned newsize = oldsize + 1 + strlen(opt) + expand + 1;
newopts = (char *) realloc(*optsp, newsize);
if (newopts)
sprintf(newopts + oldsize, ",%s", opt);
}
if (newopts == NULL) {
fprintf(stderr, "%s: failed to allocate memory\n", progname);
return -1;
}
*optsp = newopts;
return 0;
}
static int get_mnt_opts(int flags, char *opts, char **mnt_optsp)
{
int i;
int l;
if (!(flags & MS_RDONLY) && add_option(mnt_optsp, "rw", 0) == -1)
return -1;
for (i = 0; mount_flags[i].opt != NULL; i++) {
if (mount_flags[i].on && (flags & mount_flags[i].flag) &&
add_option(mnt_optsp, mount_flags[i].opt, 0) == -1)
return -1;
}
if (add_option(mnt_optsp, opts, 0) == -1)
return -1;
/* remove comma from end of opts*/
l = strlen(*mnt_optsp);
if ((*mnt_optsp)[l-1] == ',')
(*mnt_optsp)[l-1] = '\0';
if (getuid() != 0) {
const char *user = get_user_name();
if (user == NULL)
return -1;
if (add_option(mnt_optsp, "user=", strlen(user)) == -1)
return -1;
strcat(*mnt_optsp, user);
}
return 0;
}
static int opt_eq(const char *s, unsigned len, const char *opt)
{
if(strlen(opt) == len && strncmp(s, opt, len) == 0)
return 1;
else
return 0;
}
static int get_string_opt(const char *s, unsigned len, const char *opt,
char **val)
{
unsigned opt_len = strlen(opt);
if (*val)
free(*val);
*val = (char *) malloc(len - opt_len + 1);
if (!*val) {
fprintf(stderr, "%s: failed to allocate memory\n", progname);
return 0;
}
memcpy(*val, s + opt_len, len - opt_len);
(*val)[len - opt_len] = '\0';
return 1;
}
static int do_mount(const char *mnt, char **typep, mode_t rootmode,
int fd, const char *opts, const char *dev, char **sourcep,
char **mnt_optsp, off_t rootsize)
{
int res;
int flags = MS_NOSUID | MS_NODEV;
char *optbuf;
char *mnt_opts = NULL;
const char *s;
char *d;
char *fsname = NULL;
char *subtype = NULL;
char *source = NULL;
char *type = NULL;
int check_empty = 1;
int blkdev = 0;
optbuf = (char *) malloc(strlen(opts) + 128);
if (!optbuf) {
fprintf(stderr, "%s: failed to allocate memory\n", progname);
return -1;
}
for (s = opts, d = optbuf; *s;) {
unsigned len;
const char *fsname_str = "fsname=";
const char *subtype_str = "subtype=";
for (len = 0; s[len] && s[len] != ','; len++);
if (begins_with(s, fsname_str)) {
if (!get_string_opt(s, len, fsname_str, &fsname))
goto err;
} else if (begins_with(s, subtype_str)) {
if (!get_string_opt(s, len, subtype_str, &subtype))
goto err;
} else if (opt_eq(s, len, "blkdev")) {
if (getuid() != 0) {
fprintf(stderr,
"%s: option blkdev is privileged\n",
progname);
goto err;
}
blkdev = 1;
} else if (opt_eq(s, len, "nonempty")) {
check_empty = 0;
} else if (!begins_with(s, "fd=") &&
!begins_with(s, "rootmode=") &&
!begins_with(s, "user_id=") &&
!begins_with(s, "group_id=")) {
int on;
int flag;
int skip_option = 0;
if (opt_eq(s, len, "large_read")) {
struct utsname utsname;
unsigned kmaj, kmin;
res = uname(&utsname);
if (res == 0 &&
sscanf(utsname.release, "%u.%u",
&kmaj, &kmin) == 2 &&
(kmaj > 2 || (kmaj == 2 && kmin > 4))) {
fprintf(stderr, "%s: note: 'large_read' mount option is deprecated for %i.%i kernels\n", progname, kmaj, kmin);
skip_option = 1;
}
}
if (getuid() != 0 && !user_allow_other &&
(opt_eq(s, len, "allow_other") ||
opt_eq(s, len, "allow_root"))) {
fprintf(stderr, "%s: option %.*s only allowed if 'user_allow_other' is set in /etc/fuse.conf\n", progname, len, s);
goto err;
}
if (!skip_option) {
if (find_mount_flag(s, len, &on, &flag)) {
if (on)
flags |= flag;
else
flags &= ~flag;
} else {
memcpy(d, s, len);
d += len;
*d++ = ',';
}
}
}
s += len;
if (*s)
s++;
}
*d = '\0';
res = get_mnt_opts(flags, optbuf, &mnt_opts);
if (res == -1)
goto err;
sprintf(d, "fd=%i,rootmode=%o,user_id=%i,group_id=%i",
fd, rootmode, getuid(), getgid());
if (check_empty &&
fuse_mnt_check_empty(progname, mnt, rootmode, rootsize) == -1)
goto err;
source = malloc((fsname ? strlen(fsname) : 0) +
(subtype ? strlen(subtype) : 0) + strlen(dev) + 32);
type = malloc((subtype ? strlen(subtype) : 0) + 32);
if (!type || !source) {
fprintf(stderr, "%s: failed to allocate memory\n", progname);
goto err;
}
if (subtype)
sprintf(type, "%s.%s", blkdev ? "fuseblk" : "fuse", subtype);
else
strcpy(type, blkdev ? "fuseblk" : "fuse");
if (fsname)
strcpy(source, fsname);
else
strcpy(source, subtype ? subtype : dev);
res = mount(source, mnt, type, flags, optbuf);
if (res == -1 && errno == ENODEV && subtype) {
/* Probably missing subtype support */
strcpy(type, blkdev ? "fuseblk" : "fuse");
if (fsname) {
if (!blkdev)
sprintf(source, "%s#%s", subtype, fsname);
} else {
strcpy(source, type);
}
res = mount(source, mnt, type, flags, optbuf);
}
if (res == -1 && errno == EINVAL) {
/* It could be an old version not supporting group_id */
sprintf(d, "fd=%i,rootmode=%o,user_id=%i",
fd, rootmode, getuid());
res = mount(source, mnt, type, flags, optbuf);
}
if (res == -1) {
int errno_save = errno;
if (blkdev && errno == ENODEV && !fuse_mnt_check_fuseblk())
fprintf(stderr, "%s: 'fuseblk' support missing\n",
progname);
else
fprintf(stderr, "%s: mount failed: %s\n", progname,
strerror(errno_save));
goto err;
} else {
*sourcep = source;
*typep = type;
*mnt_optsp = mnt_opts;
}
free(fsname);
free(optbuf);
return res;
err:
free(fsname);
free(subtype);
free(source);
free(type);
free(mnt_opts);
free(optbuf);
return -1;
}
static int check_version(const char *dev)
{
int res;
int majorver;
int minorver;
const char *version_file;
FILE *vf;
if (strcmp(dev, FUSE_DEV_OLD) != 0)
return 0;
version_file = FUSE_VERSION_FILE_OLD;
vf = fopen(version_file, "r");
if (vf == NULL) {
fprintf(stderr, "%s: kernel interface too old\n", progname);
return -1;
}
res = fscanf(vf, "%i.%i", &majorver, &minorver);
fclose(vf);
if (res != 2) {
fprintf(stderr, "%s: error reading %s\n", progname,
version_file);
return -1;
}
if (majorver < 3) {
fprintf(stderr, "%s: kernel interface too old\n", progname);
return -1;
}
return 0;
}
static int check_perm(const char **mntp, struct stat *stbuf, int *currdir_fd,
int *mountpoint_fd)
{
int res;
const char *mnt = *mntp;
const char *origmnt = mnt;
res = lstat(mnt, stbuf);
if (res == -1) {
fprintf(stderr, "%s: failed to access mountpoint %s: %s\n",
progname, mnt, strerror(errno));
return -1;
}
/* No permission checking is done for root */
if (getuid() == 0)
return 0;
if (S_ISDIR(stbuf->st_mode)) {
*currdir_fd = open(".", O_RDONLY);
if (*currdir_fd == -1) {
fprintf(stderr,
"%s: failed to open current directory: %s\n",
progname, strerror(errno));
return -1;
}
res = chdir(mnt);
if (res == -1) {
fprintf(stderr,
"%s: failed to chdir to mountpoint: %s\n",
progname, strerror(errno));
return -1;
}
mnt = *mntp = ".";
res = lstat(mnt, stbuf);
if (res == -1) {
fprintf(stderr,
"%s: failed to access mountpoint %s: %s\n",
progname, origmnt, strerror(errno));
return -1;
}
if ((stbuf->st_mode & S_ISVTX) && stbuf->st_uid != getuid()) {
fprintf(stderr, "%s: mountpoint %s not owned by user\n",
progname, origmnt);
return -1;
}
res = access(mnt, W_OK);
if (res == -1) {
fprintf(stderr, "%s: user has no write access to mountpoint %s\n",
progname, origmnt);
return -1;
}
} else if (S_ISREG(stbuf->st_mode)) {
static char procfile[256];
*mountpoint_fd = open(mnt, O_WRONLY);
if (*mountpoint_fd == -1) {
fprintf(stderr, "%s: failed to open %s: %s\n",
progname, mnt, strerror(errno));
return -1;
}
res = fstat(*mountpoint_fd, stbuf);
if (res == -1) {
fprintf(stderr,
"%s: failed to access mountpoint %s: %s\n",
progname, mnt, strerror(errno));
return -1;
}
if (!S_ISREG(stbuf->st_mode)) {
fprintf(stderr,
"%s: mountpoint %s is no longer a regular file\n",
progname, mnt);
return -1;
}
sprintf(procfile, "/proc/self/fd/%i", *mountpoint_fd);
*mntp = procfile;
} else {
fprintf(stderr,
"%s: mountpoint %s is not a directory or a regular file\n",
progname, mnt);
return -1;
}
return 0;
}
static int try_open(const char *dev, char **devp, int silent)
{
int fd = open(dev, O_RDWR);
if (fd != -1) {
*devp = strdup(dev);
if (*devp == NULL) {
fprintf(stderr, "%s: failed to allocate memory\n",
progname);
close(fd);
fd = -1;
}
} else if (errno == ENODEV ||
errno == ENOENT)/* check for ENOENT too, for the udev case */
return -2;
else if (!silent) {
fprintf(stderr, "%s: failed to open %s: %s\n", progname, dev,
strerror(errno));
}
return fd;
}
static int try_open_fuse_device(char **devp)
{
int fd;
int err;
drop_privs();
fd = try_open(FUSE_DEV_NEW, devp, 0);
restore_privs();
if (fd >= 0)
return fd;
err = fd;
fd = try_open(FUSE_DEV_OLD, devp, 1);
if (fd >= 0)
return fd;
return err;
}
static int open_fuse_device(char **devp)
{
int fd = try_open_fuse_device(devp);
if (fd >= -1)
return fd;
fprintf(stderr,
"%s: fuse device not found, try 'modprobe fuse' first\n",
progname);
return -1;
}
static int mount_fuse(const char *mnt, const char *opts)
{
int res;
int fd;
char *dev;
struct stat stbuf;
char *type = NULL;
char *source = NULL;
char *mnt_opts = NULL;
const char *real_mnt = mnt;
int currdir_fd = -1;
int mountpoint_fd = -1;
fd = open_fuse_device(&dev);
if (fd == -1)
return -1;
drop_privs();
read_conf();
if (getuid() != 0 && mount_max != -1) {
int mount_count = count_fuse_fs();
if (mount_count >= mount_max) {
fprintf(stderr, "%s: too many FUSE filesystems mounted; mount_max=N can be set in /etc/fuse.conf\n", progname);
close(fd);
return -1;
}
}
res = check_version(dev);
if (res != -1) {
res = check_perm(&real_mnt, &stbuf, &currdir_fd,
&mountpoint_fd);
restore_privs();
if (res != -1)
res = do_mount(real_mnt, &type, stbuf.st_mode & S_IFMT,
fd, opts, dev, &source, &mnt_opts,
stbuf.st_size);
} else
restore_privs();
if (currdir_fd != -1) {
fchdir(currdir_fd);
close(currdir_fd);
}
if (mountpoint_fd != -1)
close(mountpoint_fd);
if (res == -1) {
close(fd);
return -1;
}
if (geteuid() == 0) {
res = add_mount(source, mnt, type, mnt_opts);
if (res == -1) {
umount2(mnt, 2); /* lazy umount */
close(fd);
return -1;
}
}
free(source);
free(type);
free(mnt_opts);
free(dev);
return fd;
}
static int send_fd(int sock_fd, int fd)
{
int retval;
struct msghdr msg;
struct cmsghdr *p_cmsg;
struct iovec vec;
size_t cmsgbuf[CMSG_SPACE(sizeof(fd)) / sizeof(size_t)];
int *p_fds;
char sendchar = 0;
msg.msg_control = cmsgbuf;
msg.msg_controllen = sizeof(cmsgbuf);
p_cmsg = CMSG_FIRSTHDR(&msg);
p_cmsg->cmsg_level = SOL_SOCKET;
p_cmsg->cmsg_type = SCM_RIGHTS;
p_cmsg->cmsg_len = CMSG_LEN(sizeof(fd));
p_fds = (int *) CMSG_DATA(p_cmsg);
*p_fds = fd;
msg.msg_controllen = p_cmsg->cmsg_len;
msg.msg_name = NULL;
msg.msg_namelen = 0;
msg.msg_iov = &vec;
msg.msg_iovlen = 1;
msg.msg_flags = 0;
/* "To pass file descriptors or credentials you need to send/read at
* least one byte" (man 7 unix) */
vec.iov_base = &sendchar;
vec.iov_len = sizeof(sendchar);
while ((retval = sendmsg(sock_fd, &msg, 0)) == -1 && errno == EINTR);
if (retval != 1) {
perror("sending file descriptor");
return -1;
}
return 0;
}
static void usage(void)
{
fprintf(stderr,
"%s: [options] mountpoint\n"
"Options:\n"
" -h print help\n"
" -V print version\n"
" -o opt[,opt...] mount options\n"
" -u unmount\n"
" -q quiet\n"
" -z lazy unmount\n",
progname);
exit(1);
}
static void show_version(void)
{
printf("fusermount version: %s\n", PACKAGE_VERSION);
exit(0);
}
int main(int argc, char *argv[])
{
int ch;
int fd;
int res;
char *origmnt;
char *mnt;
static int unmount = 0;
static int lazy = 0;
static int quiet = 0;
char *commfd;
int cfd;
const char *opts = "";
static const struct option long_opts[] = {
{"unmount", no_argument, NULL, 'u'},
{"lazy", no_argument, NULL, 'z'},
{"quiet", no_argument, NULL, 'q'},
{"help", no_argument, NULL, 'h'},
{"version", no_argument, NULL, 'V'},
{0, 0, 0, 0}};
progname = strdup(argv[0]);
if (progname == NULL) {
fprintf(stderr, "%s: failed to allocate memory\n", argv[0]);
exit(1);
}
while ((ch = getopt_long(argc, argv, "hVo:uzq", long_opts,
NULL)) != -1) {
switch (ch) {
case 'h':
usage();
break;
case 'V':
show_version();
break;
case 'o':
opts = optarg;
break;
case 'u':
unmount = 1;
break;
case 'z':
lazy = 1;
break;
case 'q':
quiet = 1;
break;
default:
exit(1);
}
}
if (lazy && !unmount) {
fprintf(stderr, "%s: -z can only be used with -u\n", progname);
exit(1);
}
if (optind >= argc) {
fprintf(stderr, "%s: missing mountpoint argument\n", progname);
exit(1);
} else if (argc > optind + 1) {
fprintf(stderr, "%s: extra arguments after the mountpoint\n",
progname);
exit(1);
}
origmnt = argv[optind];
drop_privs();
mnt = fuse_mnt_resolve_path(progname, origmnt);
restore_privs();
if (mnt == NULL)
exit(1);
umask(033);
if (unmount) {
if (geteuid() == 0)
res = unmount_fuse(mnt, quiet, lazy);
else {
res = umount2(mnt, lazy ? 2 : 0);
if (res == -1 && !quiet)
fprintf(stderr,
"%s: failed to unmount %s: %s\n",
progname, mnt, strerror(errno));
}
if (res == -1)
exit(1);
return 0;
}
commfd = getenv(FUSE_COMMFD_ENV);
if (commfd == NULL) {
fprintf(stderr, "%s: old style mounting not supported\n",
progname);
exit(1);
}
fd = mount_fuse(mnt, opts);
if (fd == -1)
exit(1);
cfd = atoi(commfd);
res = send_fd(cfd, fd);
if (res == -1)
exit(1);
return 0;
}

17
contrib/fuse-util/mount_util.h Normal file
View File

@ -0,0 +1,17 @@
/*
FUSE: Filesystem in Userspace
Copyright (C) 2001-2007 Miklos Szeredi <miklos@szeredi.hu>
This program can be distributed under the terms of the GNU LGPLv2.
See the file COPYING.LIB.
*/
#include <sys/types.h>
int fuse_mnt_add_mount(const char *progname, const char *fsname,
const char *mnt, const char *type, const char *opts);
int fuse_mnt_umount(const char *progname, const char *mnt, int lazy);
char *fuse_mnt_resolve_path(const char *progname, const char *orig);
int fuse_mnt_check_empty(const char *progname, const char *mnt,
mode_t rootmode, off_t rootsize);
int fuse_mnt_check_fuseblk(void);

5
xlators/mount/fuse/src/Makefile.am
View File

@ -1,6 +1,3 @@
CONTRIBDIR = $(top_srcdir)/contrib
noinst_HEADERS = $(CONTRIBDIR)/fuse-include/fuse_kernel.h
xlator_LTLIBRARIES = fuse.la
@ -11,7 +8,7 @@ fuse_la_LDFLAGS = -module -avoidversion -shared -nostartfiles
AM_CFLAGS = -fPIC -D_FILE_OFFSET_BITS=64 -D_GNU_SOURCE -D$(GF_HOST_OS) -Wall \
-I$(top_srcdir)/libglusterfs/src -I$(CONTRIBDIR)/fuse-include \
$(GF_CFLAGS) -DFUSE_USE_VERSION=26
$(GF_CFLAGS) -DFUSERMOUNT_DIR=\"$(bindir)\"
CLEANFILES =