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Support systemlessly deleting files or folders

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After we refactor the magic mount and always mount folder as tmpfs,
we can easily support deleting files or folders now. We recognize
dummy devices with major number 0 and minor number 0 as an indicator
for removing files and folders. This indicator is borrowed from
overlayfs.
This commit is contained in:
LoveSy
2023-03-13 11:27:36 +08:00
committed by John Wu
parent a6c2ba7c1e
commit d2768357da
4 changed files with 36 additions and 4 deletions
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native/src/core/module.cpp
+16 -3
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@@ -51,13 +51,14 @@ bool dir_node::prepare() {
for (auto it = children.begin(); it != children.end();) {
// We also need to upgrade to tmpfs node if any child:
// - Target does not exist
// - Source or target is a symlink (since we cannot bind mount symlink)
// - Source or target is a symlink (since we cannot bind mount symlink) or whiteout
bool cannot_mnt;
if (struct stat st{}; lstat(it->second->node_path().data(), &st) != 0) {
cannot_mnt = true;
// if it's a whiteout, we don't care if the target doesn't exist
cannot_mnt = !it->second->is_wht();
} else {
it->second->set_exist(true);
cannot_mnt = it->second->is_lnk() || S_ISLNK(st.st_mode);
cannot_mnt = it->second->is_lnk() || S_ISLNK(st.st_mode) || it->second->is_wht();
}
if (cannot_mnt) {
@@ -107,6 +108,14 @@ void dir_node::collect_module_files(const char *module, int dfd) {
node->collect_module_files(module, dirfd(dir.get()));
}
} else {
if (entry->d_type == DT_CHR) {
struct stat st{};
int ret = fstatat(dirfd(dir.get()), entry->d_name, &st, AT_SYMLINK_NOFOLLOW);
if (ret == 0 && st.st_rdev == 0) {
// if the file is a whiteout, mark it as such
entry->d_type = DT_WHT;
}
}
emplace<module_node>(entry->d_name, module, entry);
}
}
@@ -136,6 +145,10 @@ void node_entry::create_and_mount(const char *reason, const string &src, bool ro
}
void module_node::mount() {
if (is_wht()) {
VLOGD("delete", "null", node_path().data());
return;
}
std::string path = module + (parent()->root()->prefix + node_path());
string mnt_src = module_mnt + path;
{