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Kernel/VFS: Check that mount-point is not in use

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Before committing the mount, verify that this host i-node is not already
a mount-point.
This commit is contained in:
Kristiyan Stoimenov 2022-08-10 18:50:23 +03:00 committed by Brian Gianforcaro
parent 7e245b74f1
commit 9e1bea50ee
Notes: sideshowbarker 2024-07-17 08:19:42 +09:00 
Author: https://github.com/boki1 🔰
Commit: https://github.com/SerenityOS/serenity/commit/9e1bea50ee
Pull-request: https://github.com/SerenityOS/serenity/pull/14820
Reviewed-by: https://github.com/bgianfo ✅
2 changed files with 23 additions and 3 deletions
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24
Kernel/FileSystem/VirtualFileSystem.cpp
View File

@ -4,6 +4,7 @@
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/AnyOf.h>
#include <AK/GenericLexer.h>
#include <AK/Singleton.h>
#include <AK/StringBuilder.h>
@ -48,6 +49,15 @@ InodeIdentifier VirtualFileSystem::root_inode_id() const
return m_root_inode->identifier();
}
bool VirtualFileSystem::mount_point_exists_at_inode(InodeIdentifier inode_identifier)
{
return m_mounts.with([&](auto& mounts) -> bool {
return any_of(mounts, [&inode_identifier](Mount const& existing_mount) {
return existing_mount.host() && existing_mount.host()->identifier() == inode_identifier;
});
});
}
ErrorOr<void> VirtualFileSystem::mount(FileSystem& fs, Custody& mount_point, int flags)
{
return m_mounts.with([&](auto& mounts) -> ErrorOr<void> {
@ -56,7 +66,10 @@ ErrorOr<void> VirtualFileSystem::mount(FileSystem& fs, Custody& mount_point, int
fs.class_name(),
inode.identifier(),
flags);
// FIXME: check that this is not already a mount point
if (mount_point_exists_at_inode(inode.identifier())) {
dbgln("VirtualFileSystem: Mounting unsuccessful - inode {} is already a mount-point.", inode.identifier());
return EBUSY;
}
Mount mount { fs, &mount_point, flags };
mounts.append(move(mount));
return {};
@ -66,8 +79,13 @@ ErrorOr<void> VirtualFileSystem::mount(FileSystem& fs, Custody& mount_point, int
ErrorOr<void> VirtualFileSystem::bind_mount(Custody& source, Custody& mount_point, int flags)
{
return m_mounts.with([&](auto& mounts) -> ErrorOr<void> {
dbgln("VirtualFileSystem: Bind-mounting inode {} at inode {}", source.inode().identifier(), mount_point.inode().identifier());
// FIXME: check that this is not already a mount point
auto& inode = mount_point.inode();
dbgln("VirtualFileSystem: Bind-mounting inode {} at inode {}", source.inode().identifier(), inode.identifier());
if (mount_point_exists_at_inode(inode.identifier())) {
dbgln("VirtualFileSystem: Bind-mounting unsuccessful - inode {} is already a mount-point.",
mount_point.inode().identifier());
return EBUSY;
}
Mount mount { source.inode(), mount_point, flags };
mounts.append(move(mount));
return {};

2
Kernel/FileSystem/VirtualFileSystem.h
View File

@ -90,6 +90,8 @@ private:
ErrorOr<void> traverse_directory_inode(Inode&, Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>);
bool mount_point_exists_at_inode(InodeIdentifier inode);
Mount* find_mount_for_host(InodeIdentifier);
Mount* find_mount_for_guest(InodeIdentifier);