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Kernel: Add block_size_log helper to BlockDevice

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It is useful to have the log2 value of the block size while calculating
index for an IO.
This commit is contained in:
Pankaj Raghav 2022-01-29 13:03:55 +05:30 • committed by Idan Horowitz
parent 61027e5303
commit 0f010cee02
1 changed files with 5 additions and 0 deletions
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5
Kernel/Devices/BlockDevice.h
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@ -6,6 +6,7 @@
#pragma once #pragma once
#include <AK/Math.h>
#include <AK/Weakable.h> #include <AK/Weakable.h>
#include <Kernel/Devices/Device.h> #include <Kernel/Devices/Device.h>
@ -56,6 +57,7 @@ public:
virtual ~BlockDevice() override; virtual ~BlockDevice() override;
size_t block_size() const { return m_block_size; } size_t block_size() const { return m_block_size; }
u8 block_size_log() const { return m_block_size_log; }
virtual bool is_seekable() const override { return true; } virtual bool is_seekable() const override { return true; }
bool read_block(u64 index, UserOrKernelBuffer&); bool read_block(u64 index, UserOrKernelBuffer&);
@ -70,12 +72,15 @@ protected:
{ {
// 512 is the minimum sector size in most block devices // 512 is the minimum sector size in most block devices
VERIFY(m_block_size >= 512); VERIFY(m_block_size >= 512);
VERIFY(is_power_of_two(m_block_size));
m_block_size_log = AK::log2(m_block_size);
} }
private: private:
virtual bool is_block_device() const final { return true; } virtual bool is_block_device() const final { return true; }
size_t m_block_size { 0 }; size_t m_block_size { 0 };
u8 m_block_size_log { 0 };
}; };
} }