static int devpts_remount(struct super_block *sb, int *flags, char *data)
{
int err;
struct pts_fs_info *fsi = DEVPTS_SB(sb);
struct pts_mount_opts *opts = &fsi->mount_opts;
err = parse_mount_options(data, PARSE_REMOUNT, opts);
/*
* parse_mount_options() restores options to default values
* before parsing and may have changed ptmxmode. So, update the
* mode in the inode too. Bogus options don't fail the remount,
* so do this even on error return.
*/
update_ptmx_mode(fsi);
return err;
}
/*
* devpts_get_sb()
*
* If the '-o newinstance' mount option was specified, mount a new
* (private) instance of devpts. PTYs created in this instance are
* independent of the PTYs in other devpts instances.
*
* If the '-o newinstance' option was not specified, mount/remount the
* initial kernel mount of devpts. This type of mount gives the
* legacy, single-instance semantics.
*
* The 'newinstance' option is needed to support multiple namespace
* semantics in devpts while preserving backward compatibility of the
* current 'single-namespace' semantics. i.e all mounts of devpts
* without the 'newinstance' mount option should bind to the initial
* kernel mount, like get_sb_single().
*
* Mounts with 'newinstance' option create a new, private namespace.
*
* NOTE:
*
* For single-mount semantics, devpts cannot use get_sb_single(),
* because get_sb_single()/sget() find and use the super-block from
* the most recent mount of devpts. But that recent mount may be a
* 'newinstance' mount and get_sb_single() would pick the newinstance
* super-block instead of the initial super-block.
*/
static int devpts_get_sb(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data, struct vfsmount *mnt)
{
int error;
struct pts_mount_opts opts;
struct super_block *s;
error = parse_mount_options(data, PARSE_MOUNT, &opts);
if (error)
return error;
if (opts.newinstance)
s = sget(fs_type, NULL, set_anon_super, NULL);
else
s = sget(fs_type, compare_init_pts_sb, set_anon_super, NULL);
if (IS_ERR(s))
return PTR_ERR(s);
if (!s->s_root) {
s->s_flags = flags;
error = devpts_fill_super(s, data, flags & MS_SILENT ? 1 : 0);
if (error)
goto out_undo_sget;
s->s_flags |= MS_ACTIVE;
}
simple_set_mnt(mnt, s);
memcpy(&(DEVPTS_SB(s))->mount_opts, &opts, sizeof(opts));
error = mknod_ptmx(s);
if (error)
goto out_dput;
return 0;
out_dput:
dput(s->s_root); /* undo dget() in simple_set_mnt() */
out_undo_sget:
deactivate_locked_super(s);
return error;
}
static struct dentry *devpts_mount(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data)
{
int error;
struct pts_mount_opts opts;
struct super_block *s;
error = parse_mount_options(data, PARSE_MOUNT, &opts);
if (error)
return ERR_PTR(error);
if (opts.newinstance)
s = sget(fs_type, NULL, set_anon_super, NULL);
else
s = sget(fs_type, compare_init_pts_sb, set_anon_super, NULL);
if (IS_ERR(s))
return ERR_CAST(s);
if (!s->s_root) {
s->s_flags = flags;
error = devpts_fill_super(s, data, flags & MS_SILENT ? 1 : 0);
if (error)
goto out_undo_sget;
s->s_flags |= MS_ACTIVE;
}
memcpy(&(DEVPTS_SB(s))->mount_opts, &opts, sizeof(opts));
error = mknod_ptmx(s);
if (error)
goto out_undo_sget;
return dget(s->s_root);
out_undo_sget:
deactivate_locked_super(s);
return ERR_PTR(error);
}
// 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;
}
/*
* Remount as initiated by VFS layer. We just need to reparse the mount
* options, no need to signal pvfs2-client-core about it.
*/
static int orangefs_remount_fs(struct super_block *sb, int *flags, char *data)
{
gossip_debug(GOSSIP_SUPER_DEBUG, "orangefs_remount_fs: called\n");
return parse_mount_options(sb, data, 1);
}
int main (int argc, char *argv[])
{
int err = 0;
struct stat sbuf;
char *parsed_options = NULL;
struct fuse_args fargs = FUSE_ARGS_INIT(0, NULL);
struct extfs_data opts;
debugf("version:'%s', fuse_version:'%d'", VERSION, fuse_version());
memset(&opts, 0, sizeof(opts));
if (parse_options(argc, argv, &opts)) {
usage();
return -1;
}
if (stat(opts.device, &sbuf)) {
debugf_main("Failed to access '%s'", opts.device);
err = -3;
goto err_out;
}
if (do_probe(&opts) != 0) {
debugf_main("Probe failed");
err = -4;
goto err_out;
}
parsed_options = parse_mount_options(opts.options ? opts.options : "", &opts);
if (!parsed_options) {
err = -2;
goto err_out;
}
debugf_main("opts.device: %s", opts.device);
debugf_main("opts.mnt_point: %s", opts.mnt_point);
debugf_main("opts.volname: %s", (opts.volname != NULL) ? opts.volname : "");
debugf_main("opts.options: %s", opts.options);
debugf_main("parsed_options: %s", parsed_options);
if (fuse_opt_add_arg(&fargs, PACKAGE) == -1 ||
fuse_opt_add_arg(&fargs, "-s") == -1 ||
fuse_opt_add_arg(&fargs, "-o") == -1 ||
fuse_opt_add_arg(&fargs, parsed_options) == -1 ||
fuse_opt_add_arg(&fargs, opts.mnt_point) == -1) {
debugf_main("Failed to set FUSE options");
fuse_opt_free_args(&fargs);
err = -5;
goto err_out;
}
if (opts.readonly == 0) {
debugf_main("mounting read-write");
} else {
debugf_main("mounting read-only");
}
fuse_main(fargs.argc, fargs.argv, &ext2fs_ops, &opts);
err_out:
fuse_opt_free_args(&fargs);
free(parsed_options);
free(opts.options);
free(opts.device);
free(opts.volname);
return err;
}
extern int mount_main(int argc, char **argv)
{
struct stat statbuf;
char *string_flags = xstrdup("");
char *extra_opts;
int flags = 0;
char *filesystemType = "auto";
int got_filesystemType = 0;
char *device = xmalloc(PATH_MAX);
char *directory = xmalloc(PATH_MAX);
struct mntent *m = NULL;
int all = FALSE;
int fakeIt = FALSE;
int useMtab = TRUE;
int rc = EXIT_FAILURE;
FILE *f = 0;
int opt;
/* Parse options */
while ((opt = getopt(argc, argv, "o:rt:wafnv")) > 0) {
switch (opt) {
case 'o':
parse_mount_options(optarg, &flags, &string_flags);
break;
case 'r':
flags |= MS_RDONLY;
break;
case 't':
filesystemType = optarg;
got_filesystemType = 1;
break;
case 'w':
flags &= ~MS_RDONLY;
break;
case 'a':
all = TRUE;
break;
case 'f':
fakeIt = TRUE;
break;
#ifdef BB_FEATURE_MTAB_SUPPORT
case 'n':
useMtab = FALSE;
break;
#endif
case 'v':
break; /* ignore -v */
}
}
if (!all && optind == argc)
show_mounts(got_filesystemType ? filesystemType : 0);
if (optind < argc) {
/* if device is a filename get its real path */
if (stat(argv[optind], &statbuf) == 0) {
char *tmp = simplify_path(argv[optind]);
safe_strncpy(device, tmp, PATH_MAX);
} else {
safe_strncpy(device, argv[optind], PATH_MAX);
}
}
if (optind + 1 < argc)
directory = simplify_path(argv[optind + 1]);
if (all || optind + 1 == argc) {
f = setmntent("/etc/fstab", "r");
if (f == NULL)
perror_msg_and_die( "\nCannot read /etc/fstab");
while ((m = getmntent(f)) != NULL) {
if (! all && optind + 1 == argc && (
(strcmp(device, m->mnt_fsname) != 0) &&
(strcmp(device, m->mnt_dir) != 0) ) ) {
continue;
}
if (all && ( // If we're mounting 'all'
(strstr(m->mnt_opts, "noauto")) || // and the file system isn't noauto,
(strstr(m->mnt_type, "swap")) || // and isn't swap or nfs, then mount it
(strstr(m->mnt_type, "nfs")) ) ) {
continue;
}
if (all || flags == 0) { // Allow single mount to override fstab flags
flags = 0;
string_flags[0] = 0;
parse_mount_options(m->mnt_opts, &flags, &string_flags);
}
strcpy(device, m->mnt_fsname);
strcpy(directory, m->mnt_dir);
filesystemType = xstrdup(m->mnt_type);
singlemount:
extra_opts = string_flags;
rc = EXIT_SUCCESS;
#ifdef BB_NFSMOUNT
if (strchr(device, ':') != NULL) {
filesystemType = "nfs";
if (nfsmount (device, directory, &flags, &extra_opts,
&string_flags, 1)) {
perror_msg("nfsmount failed");
rc = EXIT_FAILURE;
}
}
#endif
if (!mount_one(device, directory, filesystemType, flags,
string_flags, useMtab, fakeIt, extra_opts, TRUE, all))
rc = EXIT_FAILURE;
if (! all)
break;
}
if (f)
endmntent(f);
if (! all && f && m == NULL)
fprintf(stderr, "Can't find %s in /etc/fstab\n", device);
return rc;
}
goto singlemount;
}
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;
}
