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Kernel: Implement bind mounts

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You can now bind-mount files and directories. This essentially exposes an
existing part of the file system in another place, and can be used as an
alternative to symlinks or hardlinks.

Here's an example of doing this:

    # mkdir /tmp/foo
    # mount /home/anon/myfile.txt /tmp/foo -o bind
    # cat /tmp/foo
    This is anon's file.
This commit is contained in:
Sergey Bugaev
2020-01-11 19:08:35 +03:00
committed by Andreas Kling
parent 71f1d3f819
commit 0cb0f54783
3 changed files with 29 additions and 0 deletions
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9
Kernel/Process.cpp
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@@ -3602,6 +3602,15 @@ int Process::sys$mount(const Syscall::SC_mount_params* user_params)
RefPtr<FS> fs;
if (params.flags & MS_BIND) {
// We're doing a bind mount.
auto source_or_error = VFS::the().resolve_path(source, current_directory());
if (source_or_error.is_error())
return source_or_error.error();
auto& source_custody = source_or_error.value();
return VFS::the().bind_mount(source_custody, target_custody);
}
if (fs_type == "ext2" || fs_type == "Ext2FS") {
auto metadata_or_error = VFS::the().lookup_metadata(source, current_directory());
if (metadata_or_error.is_error())