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fix(kernel/vfs): 🎉 a complete rewrite of the vfs

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This is the fourth time re-writing the VFS, hope this will be the last. Tried to make it as modular as possible so this won't be necessary in the future. 🙏

This change required the entire kernel code to be modified.
This commit is contained in:
EnderIce2
2025-05-13 15:59:12 +00:00
parent 83a7f83f81
commit 557c7e6235
83 changed files with 3252 additions and 2487 deletions
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118
Kernel/drivers/storage/ahci/ahci.cpp
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@@ -16,6 +16,7 @@
*/
#include <driver.hpp>
#include <interface/block.h>
#include <cpu.hpp>
#include <pci.hpp>
@@ -572,6 +573,9 @@ namespace Driver::AHCI
HBAPort *HBAPortPtr;
uint8_t *Buffer;
uint8_t PortNumber;
uint32_t BlockSize;
uint32_t BlockCount;
size_t Size;
ATA_IDENTIFY *IdentifyData;
Port(PortType Type, HBAPort *PortPtr, uint8_t PortNumber)
@@ -614,6 +618,7 @@ namespace Driver::AHCI
void Configure()
{
debug("Configuring port %d", PortNumber);
this->StopCMD();
void *CmdBase = v0::AllocateMemory(DriverID, 1);
HBAPortPtr->CommandListBase = (uint32_t)(uint64_t)CmdBase;
@@ -639,19 +644,35 @@ namespace Driver::AHCI
Identify();
if (IdentifyData->CommandSetSupport.BigLba)
{
if ((IdentifyData->CommandSetActive.Words119_120Valid & 0x1) != 0)
{
uint32_t wordsPerLogicalSector = (IdentifyData->WordsPerLogicalSector[1] << 16) | IdentifyData->WordsPerLogicalSector[0];
if (wordsPerLogicalSector != 0)
this->BlockSize = wordsPerLogicalSector * 2;
}
}
this->BlockSize = 512;
this->BlockCount = this->IdentifyData->UserAddressableSectors;
this->Size = this->BlockCount * this->BlockSize;
trace("Port %d \"%x %x %x %x\" configured", PortNumber,
HBAPortPtr->Vendor[0], HBAPortPtr->Vendor[1],
HBAPortPtr->Vendor[2], HBAPortPtr->Vendor[3]);
}
bool ReadWrite(uint64_t Sector, uint32_t SectorCount, void *Buffer, bool Write)
int ReadWrite(uint64_t Sector, uint32_t SectorCount, void *Buffer, bool Write)
{
if (this->AHCIPortType == PortType::SATAPI && Write == true)
{
trace("SATAPI port does not support write.");
return false;
return ENOTSUP;
}
debug("%s op on port %d, sector %d, count %d", Write ? "Write" : "Read", this->PortNumber, Sector, SectorCount);
uint32_t SectorL = (uint32_t)Sector;
uint32_t SectorH = (uint32_t)(Sector >> 32);
@@ -706,7 +727,7 @@ namespace Driver::AHCI
if (spinLock == 1000000)
{
trace("Port not responding.");
return false;
return ETIMEDOUT;
}
HBAPortPtr->CommandIssue = 1;
@@ -723,7 +744,7 @@ namespace Driver::AHCI
spinLock = 0;
retries++;
if (retries > 10)
return false;
return ETIMEDOUT;
}
if (HBAPortPtr->CommandIssue == 0)
@@ -733,11 +754,11 @@ namespace Driver::AHCI
if (HBAPortPtr->InterruptStatus & HBA_PxIS_TFES)
{
trace("Error reading/writing (%d).", Write);
return false;
return EIO;
}
}
return true;
return 0;
}
void Identify()
@@ -840,34 +861,61 @@ namespace Driver::AHCI
}
}
int Open(struct Inode *, int, mode_t)
{
return 0;
}
int Close(struct Inode *)
{
return 0;
}
ssize_t Read(struct Inode *Node, void *Buffer, size_t Size, off_t Offset)
{
uint64_t sector = Offset / 512;
uint32_t sectorCount = uint32_t(Size / 512);
int num = Node->GetMinor();
bool ok = PortDevices[num]->ReadWrite(sector, sectorCount, Buffer, false);
return ok ? Size : 0;
Port *port = static_cast<Port *>(Node->PrivateData);
if ((Offset % port->BlockSize) != 0 || (Size % port->BlockSize) != 0)
{
trace("Read offset or size not aligned to block size (BlockSize=%u)", port->BlockSize);
return -EINVAL;
}
uint64_t sector = Offset / port->BlockSize;
uint32_t sectorCount = uint32_t(Size / port->BlockSize);
if (sectorCount == 0)
{
trace("Attempt to read 0 sectors");
return 0;
}
bool status = port->ReadWrite(sector, sectorCount, Buffer, false);
if (status != 0)
{
trace("Error '%s' reading from port %d", strerror(status), port->PortNumber);
return status;
}
return Size;
}
ssize_t Write(struct Inode *Node, const void *Buffer, size_t Size, off_t Offset)
{
uint64_t sector = Offset / 512;
uint32_t sectorCount = uint32_t(Size / 512);
int num = Node->GetMinor();
bool ok = PortDevices[num]->ReadWrite(sector, sectorCount, (void *)Buffer, true);
return ok ? Size : 0;
Port *port = static_cast<Port *>(Node->PrivateData);
if ((Offset % port->BlockSize) != 0 || (Size % port->BlockSize) != 0)
{
trace("Read offset or size not aligned to block size (BlockSize=%u)", port->BlockSize);
return -EINVAL;
}
uint64_t sector = Offset / port->BlockSize;
uint32_t sectorCount = uint32_t(Size / port->BlockSize);
if (sectorCount == 0)
{
trace("Attempt to write 0 sectors");
return 0;
}
bool status = port->ReadWrite(sector, sectorCount, (void *)Buffer, true);
if (status != 0)
{
trace("Error '%s' writing to port %d", strerror(status), port->PortNumber);
return status;
}
return Size;
}
int Open(struct Inode *, int, mode_t) { return 0; }
int Close(struct Inode *) { return 0; }
const struct InodeOperations ops = {
.Lookup = nullptr,
.Create = nullptr,
@@ -915,8 +963,18 @@ namespace Driver::AHCI
{
KPrint("%s drive found at port %d", PortTypeName[portType], i);
Port *port = new Port(portType, &hba->Ports[i], i);
dev_t ret = v0::RegisterDevice(DriverID, BLOCK_TYPE_HDD, &ops);
port->Configure();
BlockDevice *dev = new BlockDevice;
dev->Name = "ahci";
dev->BlockSize = port->BlockSize;
dev->BlockCount = port->BlockCount;
dev->Size = port->Size;
dev->Ops = &ops;
dev->PrivateData = port;
dev_t ret = v0::RegisterBlockDevice(DriverID, dev);
PortDevices[ret] = port;
debug("Port %d \"%s\" registered as %d", i, port->IdentifyData->ModelNumber, ret);
break;
}
case PortType::SEMB:
@@ -942,10 +1000,6 @@ namespace Driver::AHCI
return -ENODEV;
}
trace("Initializing AHCI ports");
for (auto &&p : PortDevices)
p.second->Configure();
/* We don't use the interrupt handler now... maybe we will in the future */
// RegisterInterruptHandler(iLine(ctx->Device), (void *)OnInterruptReceived);
@@ -957,7 +1011,7 @@ namespace Driver::AHCI
for (auto &&p : PortDevices)
{
p.second->StopCMD();
v0::UnregisterDevice(DriverID, p.first);
v0::UnregisterBlockDevice(DriverID, p.first);
delete p.second;
}