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Kernel/SysFS: Fix parent directory hierarchy with symbolic links
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.
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7e6e7d67a9
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60f7d61ad2
5 changed files with 30 additions and 8 deletions
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@ -91,7 +91,8 @@ static ErrorOr<NonnullOwnPtr<KString>> generate_return_path_to_mount_point(Nonnu
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ErrorOr<NonnullOwnPtr<KString>> SysFSSymbolicLink::try_generate_return_path_to_mount_point() const
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{
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auto hops_from_mountpoint = TRY(relative_path_hops_count_from_mountpoint());
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VERIFY(m_parent_directory);
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auto hops_from_mountpoint = TRY(m_parent_directory->relative_path_hops_count_from_mountpoint());
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if (hops_from_mountpoint == 0)
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return KString::try_create("./"sv);
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auto start_return_path = TRY(KString::try_create("./"sv));
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@ -11,17 +11,32 @@
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namespace Kernel {
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ErrorOr<NonnullRefPtr<SysFSSymbolicLinkDeviceComponent>> SysFSSymbolicLinkDeviceComponent::try_create(SysFSDeviceIdentifiersDirectory const& parent_directory, Device const& device, SysFSComponent const& pointed_component)
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ErrorOr<NonnullRefPtr<SysFSSymbolicLinkDeviceComponent>> SysFSSymbolicLinkDeviceComponent::try_create(SysFSCharacterDevicesDirectory const& parent_directory, Device const& device, SysFSComponent const& pointed_component)
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{
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auto device_name = TRY(KString::formatted("{}:{}", device.major(), device.minor()));
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return adopt_nonnull_ref_or_enomem(new (nothrow) SysFSSymbolicLinkDeviceComponent(parent_directory, move(device_name), device, pointed_component));
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}
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SysFSSymbolicLinkDeviceComponent::SysFSSymbolicLinkDeviceComponent(SysFSDeviceIdentifiersDirectory const& parent_directory, NonnullOwnPtr<KString> major_minor_formatted_device_name, Device const& device, SysFSComponent const& pointed_component)
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ErrorOr<NonnullRefPtr<SysFSSymbolicLinkDeviceComponent>> SysFSSymbolicLinkDeviceComponent::try_create(SysFSBlockDevicesDirectory const& parent_directory, Device const& device, SysFSComponent const& pointed_component)
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{
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auto device_name = TRY(KString::formatted("{}:{}", device.major(), device.minor()));
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return adopt_nonnull_ref_or_enomem(new (nothrow) SysFSSymbolicLinkDeviceComponent(parent_directory, move(device_name), device, pointed_component));
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}
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SysFSSymbolicLinkDeviceComponent::SysFSSymbolicLinkDeviceComponent(SysFSCharacterDevicesDirectory const& parent_directory, NonnullOwnPtr<KString> major_minor_formatted_device_name, Device const& device, SysFSComponent const& pointed_component)
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: SysFSSymbolicLink(parent_directory, pointed_component)
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, m_block_device(device.is_block_device())
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, m_major_minor_formatted_device_name(move(major_minor_formatted_device_name))
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{
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VERIFY(device.is_block_device() || device.is_character_device());
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VERIFY(device.is_character_device());
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}
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SysFSSymbolicLinkDeviceComponent::SysFSSymbolicLinkDeviceComponent(SysFSBlockDevicesDirectory const& parent_directory, NonnullOwnPtr<KString> major_minor_formatted_device_name, Device const& device, SysFSComponent const& pointed_component)
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: SysFSSymbolicLink(parent_directory, pointed_component)
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, m_block_device(device.is_block_device())
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, m_major_minor_formatted_device_name(move(major_minor_formatted_device_name))
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{
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VERIFY(device.is_block_device());
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}
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}
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@ -8,6 +8,8 @@
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#include <AK/IntrusiveList.h>
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#include <Kernel/FileSystem/SysFS/Component.h>
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#include <Kernel/FileSystem/SysFS/Subsystems/DeviceIdentifiers/BlockDevicesDirectory.h>
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#include <Kernel/FileSystem/SysFS/Subsystems/DeviceIdentifiers/CharacterDevicesDirectory.h>
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#include <Kernel/KString.h>
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namespace Kernel {
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@ -19,12 +21,16 @@ class SysFSSymbolicLinkDeviceComponent final
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friend class SysFSComponentRegistry;
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public:
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static ErrorOr<NonnullRefPtr<SysFSSymbolicLinkDeviceComponent>> try_create(SysFSDeviceIdentifiersDirectory const& parent_directory, Device const&, SysFSComponent const& pointed_component);
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static ErrorOr<NonnullRefPtr<SysFSSymbolicLinkDeviceComponent>> try_create(SysFSCharacterDevicesDirectory const& parent_directory, Device const& device, SysFSComponent const& pointed_component);
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static ErrorOr<NonnullRefPtr<SysFSSymbolicLinkDeviceComponent>> try_create(SysFSBlockDevicesDirectory const& parent_directory, Device const& device, SysFSComponent const& pointed_component);
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virtual StringView name() const override { return m_major_minor_formatted_device_name->view(); }
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bool is_block_device() const { return m_block_device; }
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private:
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SysFSSymbolicLinkDeviceComponent(SysFSDeviceIdentifiersDirectory const& parent_directory, NonnullOwnPtr<KString> major_minor_formatted_device_name, Device const&, SysFSComponent const& pointed_component);
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SysFSSymbolicLinkDeviceComponent(SysFSCharacterDevicesDirectory const& parent_directory, NonnullOwnPtr<KString> major_minor_formatted_device_name, Device const&, SysFSComponent const& pointed_component);
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SysFSSymbolicLinkDeviceComponent(SysFSBlockDevicesDirectory const& parent_directory, NonnullOwnPtr<KString> major_minor_formatted_device_name, Device const&, SysFSComponent const& pointed_component);
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IntrusiveListNode<SysFSSymbolicLinkDeviceComponent, NonnullRefPtr<SysFSSymbolicLinkDeviceComponent>> m_list_node;
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bool const m_block_device { false };
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NonnullOwnPtr<KString> m_major_minor_formatted_device_name;
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