[Virtio-fs] [edk2 PATCH 35/48] OvmfPkg/VirtioFsDxe: add EFI_FILE_INFO cache fields to VIRTIO_FS_FILE
Laszlo Ersek
lersek at redhat.com
Wed Dec 16 21:11:12 UTC 2020
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 at arm.com>
Cc: Jordan Justen <jordan.l.justen at intel.com>
Cc: Philippe Mathieu-Daudé <philmd at redhat.com>
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=3097
Signed-off-by: Laszlo Ersek <lersek at redhat.com>
---
OvmfPkg/VirtioFsDxe/VirtioFsDxe.h | 19 +++++++++++++++++++
OvmfPkg/VirtioFsDxe/SimpleFsClose.c | 3 +++
OvmfPkg/VirtioFsDxe/SimpleFsDelete.c | 3 +++
OvmfPkg/VirtioFsDxe/SimpleFsOpen.c | 4 ++++
OvmfPkg/VirtioFsDxe/SimpleFsOpenVolume.c | 4 ++++
OvmfPkg/VirtioFsDxe/SimpleFsSetPosition.c | 9 +++++++++
6 files changed, 42 insertions(+)
diff --git a/OvmfPkg/VirtioFsDxe/VirtioFsDxe.h b/OvmfPkg/VirtioFsDxe/VirtioFsDxe.h
index 2b419048c232..a704acdd520e 100644
--- a/OvmfPkg/VirtioFsDxe/VirtioFsDxe.h
+++ b/OvmfPkg/VirtioFsDxe/VirtioFsDxe.h
@@ -42,16 +42,21 @@
//
// The limit is not expected to be a practical limitation; it's only supposed
// to prevent attempts at overflowing size calculations. For both kinds of
// pathnames, separate limits could be used; a common limit is used purely for
// simplicity.
//
#define VIRTIO_FS_MAX_PATHNAME_LENGTH ((UINTN)65535)
+//
+// Maximum value for VIRTIO_FS_FILE.NumFileInfo.
+//
+#define VIRTIO_FS_FILE_MAX_FILE_INFO 256
+
//
// Filesystem label encoded in UCS-2, transformed from the UTF-8 representation
// in "VIRTIO_FS_CONFIG.Tag", and NUL-terminated. Only the printable ASCII code
// points (U+0020 through U+007E) are supported.
//
typedef CHAR16 VIRTIO_FS_LABEL[VIRTIO_FS_TAG_BYTES + 1];
//
@@ -149,16 +154,30 @@ typedef struct {
// VIRTIO_FS_FILE object is created, primarily defined by its NodeId field,
// we also *open* the referenced file at once, and save the returned file
// handle in the FuseHandle field. This way, when an EFI_FILE_PROTOCOL member
// function must send a FUSE request that needs the file handle *in addition*
// to the inode number, FuseHandle will be at our disposal at once.
//
UINT64 NodeId;
UINT64 FuseHandle;
+ //
+ // EFI_FILE_INFO objects cached for an in-flight directory read.
+ //
+ // For reading through a directory stream with tolerable performance, we 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 do that, we 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.
+ //
+ UINT8 *FileInfoArray;
+ UINTN SingleFileInfoSize;
+ UINTN NumFileInfo;
+ UINTN NextFileInfo;
} VIRTIO_FS_FILE;
#define VIRTIO_FS_FILE_FROM_SIMPLE_FILE(SimpleFileReference) \
CR (SimpleFileReference, VIRTIO_FS_FILE, SimpleFile, VIRTIO_FS_FILE_SIG);
#define VIRTIO_FS_FILE_FROM_OPEN_FILES_ENTRY(OpenFilesEntryReference) \
CR (OpenFilesEntryReference, VIRTIO_FS_FILE, OpenFilesEntry, \
VIRTIO_FS_FILE_SIG);
diff --git a/OvmfPkg/VirtioFsDxe/SimpleFsClose.c b/OvmfPkg/VirtioFsDxe/SimpleFsClose.c
index 04b4f2c382d7..4c1cf52112ce 100644
--- a/OvmfPkg/VirtioFsDxe/SimpleFsClose.c
+++ b/OvmfPkg/VirtioFsDxe/SimpleFsClose.c
@@ -55,11 +55,14 @@ VirtioFsSimpleFileClose (
}
//
// One fewer file left open for the owner filesystem.
//
RemoveEntryList (&VirtioFsFile->OpenFilesEntry);
FreePool (VirtioFsFile->CanonicalPathname);
+ if (VirtioFsFile->FileInfoArray != NULL) {
+ FreePool (VirtioFsFile->FileInfoArray);
+ }
FreePool (VirtioFsFile);
return EFI_SUCCESS;
}
diff --git a/OvmfPkg/VirtioFsDxe/SimpleFsDelete.c b/OvmfPkg/VirtioFsDxe/SimpleFsDelete.c
index 76cfee5bceb1..76a868b3c24d 100644
--- a/OvmfPkg/VirtioFsDxe/SimpleFsDelete.c
+++ b/OvmfPkg/VirtioFsDxe/SimpleFsDelete.c
@@ -97,11 +97,14 @@ VirtioFsSimpleFileDelete (
}
//
// One fewer file left open for the owner filesystem.
//
RemoveEntryList (&VirtioFsFile->OpenFilesEntry);
FreePool (VirtioFsFile->CanonicalPathname);
+ if (VirtioFsFile->FileInfoArray != NULL) {
+ FreePool (VirtioFsFile->FileInfoArray);
+ }
FreePool (VirtioFsFile);
return Status;
}
diff --git a/OvmfPkg/VirtioFsDxe/SimpleFsOpen.c b/OvmfPkg/VirtioFsDxe/SimpleFsOpen.c
index 7c50ce9c0e76..d73d23fe8665 100644
--- a/OvmfPkg/VirtioFsDxe/SimpleFsOpen.c
+++ b/OvmfPkg/VirtioFsDxe/SimpleFsOpen.c
@@ -477,16 +477,20 @@ VirtioFsSimpleFileOpen (
NewVirtioFsFile->SimpleFile.Flush = VirtioFsSimpleFileFlush;
NewVirtioFsFile->IsDirectory = NewNodeIsDirectory;
NewVirtioFsFile->IsOpenForWriting = OpenForWriting;
NewVirtioFsFile->OwnerFs = VirtioFs;
NewVirtioFsFile->CanonicalPathname = NewCanonicalPath;
NewVirtioFsFile->FilePosition = 0;
NewVirtioFsFile->NodeId = NewNodeId;
NewVirtioFsFile->FuseHandle = NewFuseHandle;
+ NewVirtioFsFile->FileInfoArray = NULL;
+ NewVirtioFsFile->SingleFileInfoSize = 0;
+ NewVirtioFsFile->NumFileInfo = 0;
+ NewVirtioFsFile->NextFileInfo = 0;
//
// One more file is now open for the filesystem.
//
InsertTailList (&VirtioFs->OpenFiles, &NewVirtioFsFile->OpenFilesEntry);
*NewHandle = &NewVirtioFsFile->SimpleFile;
return EFI_SUCCESS;
diff --git a/OvmfPkg/VirtioFsDxe/SimpleFsOpenVolume.c b/OvmfPkg/VirtioFsDxe/SimpleFsOpenVolume.c
index 1181191d271b..058e7a41ab03 100644
--- a/OvmfPkg/VirtioFsDxe/SimpleFsOpenVolume.c
+++ b/OvmfPkg/VirtioFsDxe/SimpleFsOpenVolume.c
@@ -70,16 +70,20 @@ VirtioFsOpenVolume (
VirtioFsFile->SimpleFile.Flush = VirtioFsSimpleFileFlush;
VirtioFsFile->IsDirectory = TRUE;
VirtioFsFile->IsOpenForWriting = FALSE;
VirtioFsFile->OwnerFs = VirtioFs;
VirtioFsFile->CanonicalPathname = CanonicalPathname;
VirtioFsFile->FilePosition = 0;
VirtioFsFile->NodeId = VIRTIO_FS_FUSE_ROOT_DIR_NODE_ID;
VirtioFsFile->FuseHandle = RootDirHandle;
+ VirtioFsFile->FileInfoArray = NULL;
+ VirtioFsFile->SingleFileInfoSize = 0;
+ VirtioFsFile->NumFileInfo = 0;
+ VirtioFsFile->NextFileInfo = 0;
//
// One more file open for the filesystem.
//
InsertTailList (&VirtioFs->OpenFiles, &VirtioFsFile->OpenFilesEntry);
*Root = &VirtioFsFile->SimpleFile;
return EFI_SUCCESS;
diff --git a/OvmfPkg/VirtioFsDxe/SimpleFsSetPosition.c b/OvmfPkg/VirtioFsDxe/SimpleFsSetPosition.c
index ac6285302652..a548012d9c09 100644
--- a/OvmfPkg/VirtioFsDxe/SimpleFsSetPosition.c
+++ b/OvmfPkg/VirtioFsDxe/SimpleFsSetPosition.c
@@ -2,16 +2,18 @@
EFI_FILE_PROTOCOL.SetPosition() member function for the Virtio Filesystem
driver.
Copyright (C) 2020, Red Hat, Inc.
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
+#include <Library/MemoryAllocationLib.h> // FreePool()
+
#include "VirtioFsDxe.h"
EFI_STATUS
EFIAPI
VirtioFsSimpleFileSetPosition (
IN EFI_FILE_PROTOCOL *This,
IN UINT64 Position
)
@@ -26,16 +28,23 @@ VirtioFsSimpleFileSetPosition (
//
// Directories can only be rewound, per spec.
//
if (VirtioFsFile->IsDirectory) {
if (Position != 0) {
return EFI_UNSUPPORTED;
}
VirtioFsFile->FilePosition = 0;
+ if (VirtioFsFile->FileInfoArray != NULL) {
+ FreePool (VirtioFsFile->FileInfoArray);
+ VirtioFsFile->FileInfoArray = NULL;
+ }
+ VirtioFsFile->SingleFileInfoSize = 0;
+ VirtioFsFile->NumFileInfo = 0;
+ VirtioFsFile->NextFileInfo = 0;
return EFI_SUCCESS;
}
//
// Regular file.
//
if (Position < MAX_UINT64) {
//
--
2.19.1.3.g30247aa5d201
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