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Kernel: Allow specifying partition index with NVMe devices

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Since NVME devices end with a digit that indicates the node index we
cannot simply append a partition index. Instead, there will be a "p"
character as separator, e.g. /dev/nvme0n1p3 for the 3rd partition.
So, if the early device name ends in a digit we need to add this
separater before matching for the partition index.

If the partition index is omitted (as is the default) the root file
system is on a disk without any partition table (e.g. using QEMU).

This enables booting from the correct partition on an NVMe drive by
setting the command line variable root to e.g. root=/dev/nvme0n1p1
This commit is contained in:
Tom 2022-01-01 16:12:44 -07:00 • committed by Andreas Kling
parent c748c0726a
commit 2251733744
1 changed files with 13 additions and 2 deletions
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15
Kernel/Storage/StorageManagement.cpp
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@ -142,9 +142,20 @@ UNMAP_AFTER_INIT void StorageManagement::determine_boot_device()
m_boot_block_device = storage_device;
break;
}
auto start_storage_name = storage_name.substring_view(0, min(storage_device.early_storage_name().length(), storage_name.length()));
if (storage_device.early_storage_name().starts_with(start_storage_name)) {
// If the early storage name's last character is a digit (e.g. in the case of NVMe where the last
// number in the device name indicates the node, e.g. /dev/nvme0n1 we need to append a "p" character
// so that we can properly distinguish the partition index from the device itself
char storage_name_last_char = *(storage_device.early_storage_name().end() - 1);
String early_storage_name;
if (storage_name_last_char >= '0' && storage_name_last_char <= '9')
early_storage_name = String::formatted("{}p", storage_device.early_storage_name());
else
early_storage_name = storage_device.early_storage_name();
auto start_storage_name = storage_name.substring_view(0, min(early_storage_name.length(), storage_name.length()));
if (early_storage_name.starts_with(start_storage_name)) {
StringView partition_sign = storage_name.substring_view(start_storage_name.length());
auto possible_partition_number = partition_sign.to_uint<size_t>();
if (!possible_partition_number.has_value())