Kernel: Lock process functions instead of the ata controller

Process has to use locks at least on some functions so multithreaded
disk io is safe. This seemed to fix corrupted reads from disk

kernel/kernel/Process.cpp

@@ -1,7 +1,8 @@
 #include <BAN/StringView.h>
+#include <kernel/FS/VirtualFileSystem.h>
+#include <kernel/LockGuard.h>
 #include <kernel/Process.h>
 #include <kernel/Scheduler.h>
-#include <kernel/FS/VirtualFileSystem.h>
 
 #include <fcntl.h>
 
@@ -37,6 +38,8 @@ namespace Kernel
 
 	BAN::ErrorOr<int> Process::open(BAN::StringView path, int flags)
 	{
+		LockGuard _(m_lock);
+
 		if (flags != O_RDONLY)
 			return BAN::Error::from_errno(ENOTSUP);
 
@@ -56,6 +59,8 @@ namespace Kernel
 
 	BAN::ErrorOr<void> Process::close(int fd)
 	{
+		LockGuard _(m_lock);
+
 		TRY(validate_fd(fd));
 		auto& open_file_description = this->open_file_description(fd);
 		open_file_description.inode = nullptr;
@@ -64,6 +69,8 @@ namespace Kernel
 
 	BAN::ErrorOr<size_t> Process::read(int fd, void* buffer, size_t count)
 	{
+		LockGuard _(m_lock);
+
 		TRY(validate_fd(fd));
 		auto& open_file_description = this->open_file_description(fd);
 		if (open_file_description.offset >= open_file_description.inode->size())
@@ -74,6 +81,8 @@ namespace Kernel
 
 	BAN::ErrorOr<void> Process::creat(BAN::StringView path, mode_t mode)
 	{
+		LockGuard _(m_lock);
+
 		auto absolute_path = TRY(absolute_path_of(path));
 		while (absolute_path.sv().back() != '/')
 			absolute_path.pop_back();
@@ -86,12 +95,16 @@ namespace Kernel
 
 	Inode& Process::inode_for_fd(int fd)
 	{
+		LockGuard _(m_lock);
+
 		MUST(validate_fd(fd));
 		return *open_file_description(fd).inode;
 	}
 
 	BAN::ErrorOr<void> Process::set_working_directory(BAN::StringView path)
 	{
+		LockGuard _(m_lock);
+
 		BAN::String absolute_path = TRY(absolute_path_of(path));
 
 		auto file = TRY(VirtualFileSystem::get().file_from_absolute_path(absolute_path));

kernel/kernel/Storage/ATAController.cpp

@@ -1,5 +1,4 @@
 #include <kernel/IO.h>
-#include <kernel/LockGuard.h>
 #include <kernel/Storage/ATAController.h>
 
 #define ATA_PRIMARY  	0
@@ -191,8 +190,6 @@ namespace Kernel
 		if (lba + sector_count > device->lba_count)
 			return BAN::Error::from_c_string("Attempted to read outside of the device boundaries");
 
-		LockGuard _(m_lock);
-
 		if (lba < (1 << 28))
 		{
 			// LBA28
@@ -223,8 +220,6 @@ namespace Kernel
 		if (lba + sector_count > device->lba_count)
 			return BAN::Error::from_c_string("Attempted to read outside of the device boundaries");
 
-		LockGuard _(m_lock);
-
 		if (lba < (1 << 28))
 		{
 			// LBA28
@@ -247,8 +242,8 @@ namespace Kernel
 			ASSERT(false);
 		}
 
-		device->bus->write(ATA_PORT_COMMAND, ATA_COMMAND_CACHE_FLUSH);
 		TRY(device->bus->wait(false));
+		device->bus->write(ATA_PORT_COMMAND, ATA_COMMAND_CACHE_FLUSH);
 
 		return {};
 	}