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Kernel/SysFS: Fix parent directory hierarchy with symbolic links

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We should actually start counting from the parent directory and not from
the symbolic link as it will represent a wrong count of hops from the
actual mountpoint.

The symlinks in /sys/dev/block and /sys/dev/char worked only by luck,
because I have set it to the wrong parent directory which is the
/sys/dev directory, so with the symlink it was 3 hops to /sys, together
with the root directory, therefore, everything seemed to work.

Now that the device symlinks in /sys/dev/block and /sys/dev/char are set
to the right parent directory and we start measure hops from root
directory with the parent directory of a symlink, everything seem to
work correctly now.
This commit is contained in:
Liav A 2022-07-16 18:15:37 +03:00 • committed by Linus Groh
parent 7e6e7d67a9
commit 60f7d61ad2
5 changed files with 30 additions and 8 deletions
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3
Kernel/FileSystem/SysFS/Component.cpp
View file

@ -91,7 +91,8 @@ static ErrorOr<NonnullOwnPtr<KString>> generate_return_path_to_mount_point(Nonnu
ErrorOr<NonnullOwnPtr<KString>> SysFSSymbolicLink::try_generate_return_path_to_mount_point() const ErrorOr<NonnullOwnPtr<KString>> SysFSSymbolicLink::try_generate_return_path_to_mount_point() const
{ {
auto hops_from_mountpoint = TRY(relative_path_hops_count_from_mountpoint()); VERIFY(m_parent_directory);
auto hops_from_mountpoint = TRY(m_parent_directory->relative_path_hops_count_from_mountpoint());
if (hops_from_mountpoint == 0) if (hops_from_mountpoint == 0)
return KString::try_create("./"sv); return KString::try_create("./"sv);
auto start_return_path = TRY(KString::try_create("./"sv)); auto start_return_path = TRY(KString::try_create("./"sv));

21
Kernel/FileSystem/SysFS/Subsystems/DeviceIdentifiers/SymbolicLinkDeviceComponent.cpp
View file

@ -11,17 +11,32 @@
namespace Kernel { namespace Kernel {
ErrorOr<NonnullRefPtr<SysFSSymbolicLinkDeviceComponent>> SysFSSymbolicLinkDeviceComponent::try_create(SysFSDeviceIdentifiersDirectory const& parent_directory, Device const& device, SysFSComponent const& pointed_component) ErrorOr<NonnullRefPtr<SysFSSymbolicLinkDeviceComponent>> SysFSSymbolicLinkDeviceComponent::try_create(SysFSCharacterDevicesDirectory const& parent_directory, Device const& device, SysFSComponent const& pointed_component)
{ {
auto device_name = TRY(KString::formatted("{}:{}", device.major(), device.minor())); auto device_name = TRY(KString::formatted("{}:{}", device.major(), device.minor()));
return adopt_nonnull_ref_or_enomem(new (nothrow) SysFSSymbolicLinkDeviceComponent(parent_directory, move(device_name), device, pointed_component)); return adopt_nonnull_ref_or_enomem(new (nothrow) SysFSSymbolicLinkDeviceComponent(parent_directory, move(device_name), device, pointed_component));
} }
SysFSSymbolicLinkDeviceComponent::SysFSSymbolicLinkDeviceComponent(SysFSDeviceIdentifiersDirectory const& parent_directory, NonnullOwnPtr<KString> major_minor_formatted_device_name, Device const& device, SysFSComponent const& pointed_component)
ErrorOr<NonnullRefPtr<SysFSSymbolicLinkDeviceComponent>> SysFSSymbolicLinkDeviceComponent::try_create(SysFSBlockDevicesDirectory const& parent_directory, Device const& device, SysFSComponent const& pointed_component)
{
auto device_name = TRY(KString::formatted("{}:{}", device.major(), device.minor()));
return adopt_nonnull_ref_or_enomem(new (nothrow) SysFSSymbolicLinkDeviceComponent(parent_directory, move(device_name), device, pointed_component));
}
SysFSSymbolicLinkDeviceComponent::SysFSSymbolicLinkDeviceComponent(SysFSCharacterDevicesDirectory const& parent_directory, NonnullOwnPtr<KString> major_minor_formatted_device_name, Device const& device, SysFSComponent const& pointed_component)
: SysFSSymbolicLink(parent_directory, pointed_component) : SysFSSymbolicLink(parent_directory, pointed_component)
, m_block_device(device.is_block_device()) , m_block_device(device.is_block_device())
, m_major_minor_formatted_device_name(move(major_minor_formatted_device_name)) , m_major_minor_formatted_device_name(move(major_minor_formatted_device_name))
{ {
VERIFY(device.is_block_device() || device.is_character_device()); VERIFY(device.is_character_device());
}
SysFSSymbolicLinkDeviceComponent::SysFSSymbolicLinkDeviceComponent(SysFSBlockDevicesDirectory const& parent_directory, NonnullOwnPtr<KString> major_minor_formatted_device_name, Device const& device, SysFSComponent const& pointed_component)
: SysFSSymbolicLink(parent_directory, pointed_component)
, m_block_device(device.is_block_device())
, m_major_minor_formatted_device_name(move(major_minor_formatted_device_name))
{
VERIFY(device.is_block_device());
} }
} }

10
Kernel/FileSystem/SysFS/Subsystems/DeviceIdentifiers/SymbolicLinkDeviceComponent.h
View file

@ -8,6 +8,8 @@
#include <AK/IntrusiveList.h> #include <AK/IntrusiveList.h>
#include <Kernel/FileSystem/SysFS/Component.h> #include <Kernel/FileSystem/SysFS/Component.h>
#include <Kernel/FileSystem/SysFS/Subsystems/DeviceIdentifiers/BlockDevicesDirectory.h>
#include <Kernel/FileSystem/SysFS/Subsystems/DeviceIdentifiers/CharacterDevicesDirectory.h>
#include <Kernel/KString.h> #include <Kernel/KString.h>
namespace Kernel { namespace Kernel {
@ -19,12 +21,16 @@ class SysFSSymbolicLinkDeviceComponent final
friend class SysFSComponentRegistry; friend class SysFSComponentRegistry;
public: public:
static ErrorOr<NonnullRefPtr<SysFSSymbolicLinkDeviceComponent>> try_create(SysFSDeviceIdentifiersDirectory const& parent_directory, Device const&, SysFSComponent const& pointed_component); static ErrorOr<NonnullRefPtr<SysFSSymbolicLinkDeviceComponent>> try_create(SysFSCharacterDevicesDirectory const& parent_directory, Device const& device, SysFSComponent const& pointed_component);
static ErrorOr<NonnullRefPtr<SysFSSymbolicLinkDeviceComponent>> try_create(SysFSBlockDevicesDirectory const& parent_directory, Device const& device, SysFSComponent const& pointed_component);
virtual StringView name() const override { return m_major_minor_formatted_device_name->view(); } virtual StringView name() const override { return m_major_minor_formatted_device_name->view(); }
bool is_block_device() const { return m_block_device; } bool is_block_device() const { return m_block_device; }
private: private:
SysFSSymbolicLinkDeviceComponent(SysFSDeviceIdentifiersDirectory const& parent_directory, NonnullOwnPtr<KString> major_minor_formatted_device_name, Device const&, SysFSComponent const& pointed_component); SysFSSymbolicLinkDeviceComponent(SysFSCharacterDevicesDirectory const& parent_directory, NonnullOwnPtr<KString> major_minor_formatted_device_name, Device const&, SysFSComponent const& pointed_component);
SysFSSymbolicLinkDeviceComponent(SysFSBlockDevicesDirectory const& parent_directory, NonnullOwnPtr<KString> major_minor_formatted_device_name, Device const&, SysFSComponent const& pointed_component);
IntrusiveListNode<SysFSSymbolicLinkDeviceComponent, NonnullRefPtr<SysFSSymbolicLinkDeviceComponent>> m_list_node; IntrusiveListNode<SysFSSymbolicLinkDeviceComponent, NonnullRefPtr<SysFSSymbolicLinkDeviceComponent>> m_list_node;
bool const m_block_device { false }; bool const m_block_device { false };
NonnullOwnPtr<KString> m_major_minor_formatted_device_name; NonnullOwnPtr<KString> m_major_minor_formatted_device_name;

2
Kernel/Graphics/DisplayConnector.cpp
View file

@ -76,7 +76,7 @@ void DisplayConnector::after_inserting()
m_sysfs_device_directory = sysfs_display_connector_device_directory; m_sysfs_device_directory = sysfs_display_connector_device_directory;
SysFSDisplayConnectorsDirectory::the().plug({}, *sysfs_display_connector_device_directory); SysFSDisplayConnectorsDirectory::the().plug({}, *sysfs_display_connector_device_directory);
VERIFY(!m_symlink_sysfs_component); VERIFY(!m_symlink_sysfs_component);
auto sys_fs_component = MUST(SysFSSymbolicLinkDeviceComponent::try_create(SysFSDeviceIdentifiersDirectory::the(), *this, *m_sysfs_device_directory)); auto sys_fs_component = MUST(SysFSSymbolicLinkDeviceComponent::try_create(SysFSCharacterDevicesDirectory::the(), *this, *m_sysfs_device_directory));
m_symlink_sysfs_component = sys_fs_component; m_symlink_sysfs_component = sys_fs_component;
after_inserting_add_symlink_to_device_identifier_directory(); after_inserting_add_symlink_to_device_identifier_directory();

2
Kernel/Storage/StorageDevice.cpp
View file

@ -35,7 +35,7 @@ void StorageDevice::after_inserting()
m_sysfs_device_directory = sysfs_storage_device_directory; m_sysfs_device_directory = sysfs_storage_device_directory;
SysFSStorageDirectory::the().plug({}, *sysfs_storage_device_directory); SysFSStorageDirectory::the().plug({}, *sysfs_storage_device_directory);
VERIFY(!m_symlink_sysfs_component); VERIFY(!m_symlink_sysfs_component);
auto sys_fs_component = MUST(SysFSSymbolicLinkDeviceComponent::try_create(SysFSDeviceIdentifiersDirectory::the(), *this, *m_sysfs_device_directory)); auto sys_fs_component = MUST(SysFSSymbolicLinkDeviceComponent::try_create(SysFSBlockDevicesDirectory::the(), *this, *m_sysfs_device_directory));
m_symlink_sysfs_component = sys_fs_component; m_symlink_sysfs_component = sys_fs_component;
after_inserting_add_symlink_to_device_identifier_directory(); after_inserting_add_symlink_to_device_identifier_directory();
} }