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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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18
Kernel/FileSystem/VirtualFileSystem.cpp
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@@ -49,6 +49,16 @@ KResult VFS::mount(FS& file_system, Custody& mount_point, int flags)
return KSuccess;
}
KResult VFS::bind_mount(Custody& source, Custody& mount_point)
{
dbg() << "VFS: Bind-mounting " << source.absolute_path() << " at " << mount_point.absolute_path();
// FIXME: check that this is not already a mount point
Mount mount { source.inode(), mount_point };
m_mounts.append(move(mount));
mount_point.did_mount_on({});
return KSuccess;
}
KResult VFS::unmount(InodeIdentifier guest_inode_id)
{
LOCKER(m_lock);
@@ -617,6 +627,14 @@ VFS::Mount::Mount(FS& guest_fs, Custody* host_custody, int flags)
{
}
VFS::Mount::Mount(Inode& source, Custody& host_custody)
: m_guest(source.identifier())
, m_guest_fs(source.fs())
, m_host_custody(host_custody)
, m_flags(MS_BIND)
{
}
String VFS::Mount::absolute_path() const
{
if (!m_host_custody)