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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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2
Kernel/FileSystem/VirtualFileSystem.h
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@ -48,6 +48,7 @@ public:
class Mount {
public:
Mount(FS&, Custody* host_custody, int flags);
Mount(Inode& source, Custody& host_custody);
InodeIdentifier host() const;
InodeIdentifier guest() const { return m_guest; }
@ -73,6 +74,7 @@ public:
bool mount_root(FS&);
KResult mount(FS&, Custody& mount_point, int flags);
KResult bind_mount(Custody& source, Custody& mount_point);
KResult unmount(InodeIdentifier guest_inode_id);
KResultOr<NonnullRefPtr<FileDescription>> open(StringView path, int options, mode_t mode, Custody& base, Optional<UidAndGid> = {});