// Mount one directory. Handles CIFS, NFS, loopback, autobind, and filesystem
// type detection. Returns 0 for success, nonzero for failure.
// NB: mp->xxx fields may be trashed on exit
static int singlemount(struct mntent *mp, int ignore_busy)
{
int rc = -1, vfsflags;
char *loopFile = 0, *filteropts = 0;
llist_t *fl = 0;
struct stat st;
vfsflags = parse_mount_options(mp->mnt_opts, &filteropts);
// Treat fstype "auto" as unspecified.
if (mp->mnt_type && strcmp(mp->mnt_type,"auto") == 0)
mp->mnt_type = 0;
// Might this be an CIFS filesystem?
if (ENABLE_FEATURE_MOUNT_CIFS
&& (!mp->mnt_type || strcmp(mp->mnt_type,"cifs") == 0)
&& (mp->mnt_fsname[0]=='/' || mp->mnt_fsname[0]=='\\')
&& mp->mnt_fsname[0]==mp->mnt_fsname[1]
) {
len_and_sockaddr *lsa;
char *ip, *dotted;
char *s;
rc = 1;
// Replace '/' with '\' and verify that unc points to "//server/share".
for (s = mp->mnt_fsname; *s; ++s)
if (*s == '/') *s = '\\';
// get server IP
s = strrchr(mp->mnt_fsname, '\\');
if (s <= mp->mnt_fsname+1) goto report_error;
*s = '\0';
lsa = host2sockaddr(mp->mnt_fsname+2, 0);
*s = '\\';
if (!lsa) goto report_error;
// insert ip=... option into string flags.
dotted = xmalloc_sockaddr2dotted_noport(&lsa->sa, lsa->len);
ip = xasprintf("ip=%s", dotted);
parse_mount_options(ip, &filteropts);
// compose new unc '\\server-ip\share'
// (s => slash after hostname)
mp->mnt_fsname = xasprintf("\\\\%s%s", dotted, s);
// lock is required
vfsflags |= MS_MANDLOCK;
mp->mnt_type = (char*)"cifs";
rc = mount_it_now(mp, vfsflags, filteropts);
if (ENABLE_FEATURE_CLEAN_UP) {
free(mp->mnt_fsname);
free(ip);
free(dotted);
free(lsa);
}
goto report_error;
}
// Might this be an NFS filesystem?
if (ENABLE_FEATURE_MOUNT_NFS
&& (!mp->mnt_type || !strcmp(mp->mnt_type,"nfs"))
&& strchr(mp->mnt_fsname, ':') != NULL
) {
rc = nfsmount(mp, vfsflags, filteropts);
goto report_error;
}
// Look at the file. (Not found isn't a failure for remount, or for
// a synthetic filesystem like proc or sysfs.)
// (We use stat, not lstat, in order to allow
// mount symlink_to_file_or_blkdev dir)
if (!stat(mp->mnt_fsname, &st)
&& !(vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE))
) {
// Do we need to allocate a loopback device for it?
if (ENABLE_FEATURE_MOUNT_LOOP && S_ISREG(st.st_mode)) {
loopFile = bb_simplify_path(mp->mnt_fsname);
mp->mnt_fsname = 0;
switch (set_loop(&(mp->mnt_fsname), loopFile, 0)) {
case 0:
case 1:
break;
default:
bb_error_msg( errno == EPERM || errno == EACCES
? bb_msg_perm_denied_are_you_root
: "cannot setup loop device");
return errno;
}
// Autodetect bind mounts
} else if (S_ISDIR(st.st_mode) && !mp->mnt_type)
vfsflags |= MS_BIND;
}
/* If we know the fstype (or don't need to), jump straight
* to the actual mount. */
if (mp->mnt_type || (vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE)))
rc = mount_it_now(mp, vfsflags, filteropts);
else {
// Loop through filesystem types until mount succeeds
// or we run out
/* Initialize list of block backed filesystems. This has to be
* done here so that during "mount -a", mounts after /proc shows up
* can autodetect. */
if (!fslist) {
fslist = get_block_backed_filesystems();
if (ENABLE_FEATURE_CLEAN_UP && fslist)
atexit(delete_block_backed_filesystems);
}
for (fl = fslist; fl; fl = fl->link) {
mp->mnt_type = fl->data;
rc = mount_it_now(mp, vfsflags, filteropts);
if (!rc) break;
}
}
// If mount failed, clean up loop file (if any).
if (ENABLE_FEATURE_MOUNT_LOOP && rc && loopFile) {
del_loop(mp->mnt_fsname);
if (ENABLE_FEATURE_CLEAN_UP) {
free(loopFile);
free(mp->mnt_fsname);
}
}
report_error:
if (ENABLE_FEATURE_CLEAN_UP)
free(filteropts);
if (rc && errno == EBUSY && ignore_busy) rc = 0;
if (rc < 0)
/* perror here sometimes says "mounting ... on ... failed: Success" */
bb_error_msg("mounting %s on %s failed", mp->mnt_fsname, mp->mnt_dir);
return rc;
}
// Perform actual mount of specific filesystem at specific location.
// NB: mp->xxx fields may be trashed on exit
static int mount_it_now(struct mntent *mp, int vfsflags, char *filteropts)
{
int rc = 0;
if (fakeIt) goto mtab;
// Mount, with fallback to read-only if necessary.
for (;;) {
rc = mount(mp->mnt_fsname, mp->mnt_dir, mp->mnt_type,
vfsflags, filteropts);
if (!rc || (vfsflags&MS_RDONLY) || (errno!=EACCES && errno!=EROFS))
break;
bb_error_msg("%s is write-protected, mounting read-only",
mp->mnt_fsname);
vfsflags |= MS_RDONLY;
}
// Abort entirely if permission denied.
if (rc && errno == EPERM)
bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
/* If the mount was successful, and we're maintaining an old-style
* mtab file by hand, add the new entry to it now. */
mtab:
if (ENABLE_FEATURE_MTAB_SUPPORT && useMtab && !rc && !(vfsflags & MS_REMOUNT)) {
char *fsname;
FILE *mountTable = setmntent(bb_path_mtab_file, "a+");
int i;
if (!mountTable) {
bb_error_msg("no %s",bb_path_mtab_file);
goto ret;
}
// Add vfs string flags
for (i=0; mount_options[i].flags != MS_REMOUNT; i++)
if (mount_options[i].flags > 0 && (mount_options[i].flags & vfsflags))
append_mount_options(&(mp->mnt_opts), mount_options[i].name);
// Remove trailing / (if any) from directory we mounted on
i = strlen(mp->mnt_dir) - 1;
if (i > 0 && mp->mnt_dir[i] == '/') mp->mnt_dir[i] = 0;
// Convert to canonical pathnames as needed
mp->mnt_dir = bb_simplify_path(mp->mnt_dir);
fsname = 0;
if (!mp->mnt_type || !*mp->mnt_type) { /* bind mount */
mp->mnt_fsname = fsname = bb_simplify_path(mp->mnt_fsname);
mp->mnt_type = (char*)"bind";
}
mp->mnt_freq = mp->mnt_passno = 0;
// Write and close.
addmntent(mountTable, mp);
endmntent(mountTable);
if (ENABLE_FEATURE_CLEAN_UP) {
free(mp->mnt_dir);
free(fsname);
}
}
ret:
return rc;
}
static int singlemount(struct mntent *mp, int ignore_busy)
{
int rc = -1, vfsflags;
char *loopFile = 0, *filteropts = 0;
llist_t *fl = 0;
struct stat st;
vfsflags = parse_mount_options(mp->mnt_opts, &filteropts);
// Treat fstype "auto" as unspecified.
if (mp->mnt_type && !strcmp(mp->mnt_type,"auto")) mp->mnt_type = 0;
// Might this be an NFS filesystem?
if (ENABLE_FEATURE_MOUNT_NFS &&
(!mp->mnt_type || !strcmp(mp->mnt_type,"nfs")) &&
strchr(mp->mnt_fsname, ':') != NULL)
{
if (nfsmount(mp->mnt_fsname, mp->mnt_dir, &vfsflags, &filteropts, 1)) {
bb_perror_msg("nfsmount failed");
goto report_error;
} else {
// Strangely enough, nfsmount() doesn't actually mount() anything.
mp->mnt_type = "nfs";
rc = mount_it_now(mp, vfsflags, filteropts);
if (ENABLE_FEATURE_CLEAN_UP) free(filteropts);
goto report_error;
}
}
// Look at the file. (Not found isn't a failure for remount, or for
// a synthetic filesystem like proc or sysfs.)
if (stat(mp->mnt_fsname, &st));
else if (!(vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE))) {
// Do we need to allocate a loopback device for it?
if (ENABLE_FEATURE_MOUNT_LOOP && S_ISREG(st.st_mode)) {
loopFile = bb_simplify_path(mp->mnt_fsname);
mp->mnt_fsname = 0;
switch(set_loop(&(mp->mnt_fsname), loopFile, 0)) {
case 0:
case 1:
break;
default:
bb_error_msg( errno == EPERM || errno == EACCES
? bb_msg_perm_denied_are_you_root
: "Couldn't setup loop device");
return errno;
}
// Autodetect bind mounts
} else if (S_ISDIR(st.st_mode) && !mp->mnt_type) vfsflags |= MS_BIND;
}
/* If we know the fstype (or don't need to), jump straight
* to the actual mount. */
if (mp->mnt_type || (vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE)))
rc = mount_it_now(mp, vfsflags, filteropts);
// Loop through filesystem types until mount succeeds or we run out
else {
/* Initialize list of block backed filesystems. This has to be
* done here so that during "mount -a", mounts after /proc shows up
* can autodetect. */
if (!fslist) {
fslist = get_block_backed_filesystems();
if (ENABLE_FEATURE_CLEAN_UP && fslist)
atexit(delete_block_backed_filesystems);
}
for (fl = fslist; fl; fl = fl->link) {
mp->mnt_type = fl->data;
if (!(rc = mount_it_now(mp,vfsflags, filteropts))) break;
mp->mnt_type = 0;
}
}
if (ENABLE_FEATURE_CLEAN_UP) free(filteropts);
// If mount failed, clean up loop file (if any).
if (ENABLE_FEATURE_MOUNT_LOOP && rc && loopFile) {
del_loop(mp->mnt_fsname);
if (ENABLE_FEATURE_CLEAN_UP) {
free(loopFile);
free(mp->mnt_fsname);
}
}
report_error:
if (rc && errno == EBUSY && ignore_busy) rc = 0;
if (rc < 0)
bb_perror_msg("Mounting %s on %s failed", mp->mnt_fsname, mp->mnt_dir);
return rc;
}
