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New pre-init magic mount implementation

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topjohnwu 2020-02-21 00:49:58 -08:00
parent 0d229dac3b
commit 696ab677be
1 changed files with 7 additions and 11 deletions
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18
native/jni/init/rootdir.cpp
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@ -245,20 +245,18 @@ static void recreate_sbin(const char *mirror, bool use_bind_mount) {
static string magic_mount_list; static string magic_mount_list;
static void magic_mount(int dirfd, const string &path) { static void magic_mount(const string &sdir, const string &ddir = "") {
DIR *dir = xfdopendir(dirfd); auto dir = xopen_dir(sdir.data());
for (dirent *entry; (entry = readdir(dir));) { for (dirent *entry; (entry = readdir(dir.get()));) {
if (entry->d_name == "."sv || entry->d_name == ".."sv) if (entry->d_name == "."sv || entry->d_name == ".."sv)
continue; continue;
string dest = path + "/" + entry->d_name; string src = sdir + "/" + entry->d_name;
string dest = ddir + "/" + entry->d_name;
if (access(dest.data(), F_OK) == 0) { if (access(dest.data(), F_OK) == 0) {
if (entry->d_type == DT_DIR) { if (entry->d_type == DT_DIR) {
// Recursive // Recursive
int fd = xopenat(dirfd, entry->d_name, O_RDONLY | O_CLOEXEC); magic_mount(src, dest);
magic_mount(fd, dest);
close(fd);
} else { } else {
string src = ROOTOVL + dest;
LOGD("Mount [%s] -> [%s]\n", src.data(), dest.data()); LOGD("Mount [%s] -> [%s]\n", src.data(), dest.data());
xmount(src.data(), dest.data(), nullptr, MS_BIND, nullptr); xmount(src.data(), dest.data(), nullptr, MS_BIND, nullptr);
magic_mount_list += dest; magic_mount_list += dest;
@ -360,9 +358,7 @@ void SARBase::patch_rootdir() {
clone_attr("/init.rc", ROOTOVL "/init.rc"); clone_attr("/init.rc", ROOTOVL "/init.rc");
// Mount rootdir // Mount rootdir
src = xopen(ROOTOVL, O_RDONLY | O_CLOEXEC); magic_mount(ROOTOVL);
magic_mount(src, "");
close(src);
dest = xopen(ROOTMNT, O_WRONLY | O_CREAT | O_CLOEXEC); dest = xopen(ROOTMNT, O_WRONLY | O_CREAT | O_CLOEXEC);
write(dest, magic_mount_list.data(), magic_mount_list.length()); write(dest, magic_mount_list.data(), magic_mount_list.length());
close(dest); close(dest);