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Kernel: Do the umount() by the guest's root inode identifier

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It was previously possible to unmount a filesystem mounted on /mnt by
doing e.g "umount /mnt/some/path".
This commit is contained in:
Andreas Kling 2019-08-17 14:24:50 +02:00
parent c029f39895
commit 5f6b6c1665
3 changed files with 14 additions and 16 deletions
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21
Kernel/FileSystem/VirtualFileSystem.cpp
View file

@ -58,25 +58,26 @@ KResult VFS::mount(NonnullRefPtr<FS>&& file_system, StringView path)
return mount(move(file_system), result.value()); return mount(move(file_system), result.value());
} }
KResult VFS::unmount(NonnullRefPtr<FS>&& file_system) KResult VFS::unmount(InodeIdentifier guest_inode_id)
{ {
LOCKER(m_lock); LOCKER(m_lock);
dbg() << "VFS: unmount called with fsid " << file_system.ptr()->fsid(); dbg() << "VFS: unmount called with inode " << guest_inode_id;
for (auto i = 0; i < m_mounts.size(); i++) { for (int i = 0; i < m_mounts.size(); ++i) {
auto mount = m_mounts.at(i); auto& mount = m_mounts.at(i);
if (mount.guest_fs().fsid() == file_system.ptr()->fsid()) { if (mount.guest() == guest_inode_id) {
if (mount.guest_fs().prepare_to_unmount() != KSuccess) { auto result = mount.guest_fs().prepare_to_unmount();
dbg() << "VFS: Failed to unmount! Device busy"; if (result.is_error()) {
return KResult(-EBUSY); dbg() << "VFS: Failed to unmount!";
return result;
} }
dbg() << "VFS: found fs " << file_system.ptr()->fsid() << " at mount " << i << "! Unmounting..."; dbg() << "VFS: found fs " << mount.guest_fs().fsid() << " at mount index " << i << "! Unmounting...";
m_mounts.remove(i); m_mounts.remove(i);
return KSuccess; return KSuccess;
} }
} }
dbg() << "VFS: unmount unable to find fsid in m_mounts!"; dbg() << "VFS: Nothing mounted on inode " << guest_inode_id;
return KResult(-ENODEV); return KResult(-ENODEV);
} }

2
Kernel/FileSystem/VirtualFileSystem.h
View file

@ -59,7 +59,7 @@ public:
bool mount_root(NonnullRefPtr<FS>&&); bool mount_root(NonnullRefPtr<FS>&&);
KResult mount(NonnullRefPtr<FS>&&, StringView path); KResult mount(NonnullRefPtr<FS>&&, StringView path);
KResult mount(NonnullRefPtr<FS>&&, Custody& mount_point); KResult mount(NonnullRefPtr<FS>&&, Custody& mount_point);
KResult unmount(NonnullRefPtr<FS>&&); KResult unmount(InodeIdentifier guest_inode_id);
KResultOr<NonnullRefPtr<FileDescription>> open(StringView path, int options, mode_t mode, Custody& base); KResultOr<NonnullRefPtr<FileDescription>> open(StringView path, int options, mode_t mode, Custody& base);
KResultOr<NonnullRefPtr<FileDescription>> create(StringView path, int options, mode_t mode, Custody& parent_custody); KResultOr<NonnullRefPtr<FileDescription>> create(StringView path, int options, mode_t mode, Custody& parent_custody);

7
Kernel/Process.cpp
View file

@ -2811,11 +2811,8 @@ int Process::sys$umount(const char* mountpoint)
if (metadata_or_error.is_error()) if (metadata_or_error.is_error())
return metadata_or_error.error(); return metadata_or_error.error();
auto fsid = metadata_or_error.value().inode.fsid(); auto guest_inode_id = metadata_or_error.value().inode;
auto fs = Ext2FS::from_fsid(fsid); return VFS::the().unmount(guest_inode_id);
auto ret = VFS::the().unmount(*fs);
return ret;
} }
ProcessTracer& Process::ensure_tracer() ProcessTracer& Process::ensure_tracer()