OvmfPkg/VirtioFsDxe: add EFI_FILE_INFO cache fields to VIRTIO_FS_FILE
For reading through a directory stream with tolerable performance, we'll have to call FUSE_READDIRPLUS each time with such a buffer that can deliver a good number of variable size records (VIRTIO_FS_FUSE_DIRENTPLUS_RESPONSE elements). Every time we'll do that, we'll turn the whole bunch into an array of EFI_FILE_INFOs immediately. EFI_FILE_PROTOCOL.Read() invocations (on directories) will be served from this EFI_FILE_INFO cache. Add the fields for the EFI_FILE_INFO cache to VIRTIO_FS_FILE: - initialize them in Open() and OpenVolume(), - release the cache in Close() and Delete(), - also release the cache when the directory is rewound, in SetPosition(). Cc: Ard Biesheuvel <ard.biesheuvel@arm.com> Cc: Jordan Justen <jordan.l.justen@intel.com> Cc: Philippe Mathieu-Daudé <philmd@redhat.com> Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=3097 Signed-off-by: Laszlo Ersek <lersek@redhat.com> Message-Id: <20201216211125.19496-36-lersek@redhat.com> Acked-by: Ard Biesheuvel <ard.biesheuvel@arm.com>
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@@ -7,6 +7,8 @@
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <Library/MemoryAllocationLib.h> // FreePool()
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#include "VirtioFsDxe.h"
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EFI_STATUS
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@@ -31,6 +33,13 @@ VirtioFsSimpleFileSetPosition (
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return EFI_UNSUPPORTED;
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}
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VirtioFsFile->FilePosition = 0;
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if (VirtioFsFile->FileInfoArray != NULL) {
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FreePool (VirtioFsFile->FileInfoArray);
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VirtioFsFile->FileInfoArray = NULL;
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}
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VirtioFsFile->SingleFileInfoSize = 0;
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VirtioFsFile->NumFileInfo = 0;
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VirtioFsFile->NextFileInfo = 0;
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return EFI_SUCCESS;
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}
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