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| author | Laszlo Ersek <lersek@redhat.com> | 2020-12-16 22:10:59 +0100 |
|---|---|---|
| committer | mergify[bot] <37929162+mergify[bot]@users.noreply.github.com> | 2020-12-21 17:16:23 +0000 |
| commit | b6ce961a42f08be13f7fc7a561be530ad58434e5 (patch) | |
| tree | 93ffc60c57df3459391a3b17ab083c9e885a49ba /OvmfPkg/VirtioFsDxe | |
| parent | cd473d41dd8ba0cf400d2f4f4d4803f5dc56068e (diff) | |
| download | edk2-b6ce961a42f08be13f7fc7a561be530ad58434e5.tar.gz edk2-b6ce961a42f08be13f7fc7a561be530ad58434e5.tar.bz2 edk2-b6ce961a42f08be13f7fc7a561be530ad58434e5.zip | |
OvmfPkg/VirtioFsDxe: implement the wrapper function for FUSE_LOOKUP
Add the VirtioFsFuseLookup() function, for sending the FUSE_LOOKUP command
to the Virtio Filesystem device.
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: <20201216211125.19496-23-lersek@redhat.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel@arm.com>
Diffstat (limited to 'OvmfPkg/VirtioFsDxe')
| -rw-r--r-- | OvmfPkg/VirtioFsDxe/FuseLookup.c | 148 | ||||
| -rw-r--r-- | OvmfPkg/VirtioFsDxe/VirtioFsDxe.h | 9 | ||||
| -rw-r--r-- | OvmfPkg/VirtioFsDxe/VirtioFsDxe.inf | 1 |
3 files changed, 158 insertions, 0 deletions
diff --git a/OvmfPkg/VirtioFsDxe/FuseLookup.c b/OvmfPkg/VirtioFsDxe/FuseLookup.c new file mode 100644 index 0000000000..5c9a825e17 --- /dev/null +++ b/OvmfPkg/VirtioFsDxe/FuseLookup.c @@ -0,0 +1,148 @@ +/** @file
+ FUSE_LOOKUP wrapper for the Virtio Filesystem device.
+
+ Copyright (C) 2020, Red Hat, Inc.
+
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+**/
+
+#include <Library/BaseLib.h> // AsciiStrSize()
+
+#include "VirtioFsDxe.h"
+
+/**
+ Send a FUSE_LOOKUP request to the Virtio Filesystem device, for resolving a
+ filename to an inode.
+
+ The function returns EFI_NOT_FOUND exclusively if the Virtio Filesystem
+ device explicitly responds with ENOENT -- "No such file or directory".
+
+ The function may only be called after VirtioFsFuseInitSession() returns
+ successfully and before VirtioFsUninit() is called.
+
+ @param[in,out] VirtioFs The Virtio Filesystem device to send the FUSE_LOOKUP
+ request to. On output, the FUSE request counter
+ "VirtioFs->RequestId" will have been incremented.
+
+ @param[in] DirNodeId The inode number of the directory in which Name
+ should be resolved to an inode.
+
+ @param[in] Name The single-component filename to resolve in the
+ directory identified by DirNodeId.
+
+ @param[out] NodeId The inode number which Name has been resolved to.
+
+ @param[out] FuseAttr The VIRTIO_FS_FUSE_ATTRIBUTES_RESPONSE object
+ describing the properties of the resolved inode.
+
+ @retval EFI_SUCCESS Filename to inode resolution successful.
+
+ @retval EFI_NOT_FOUND The Virtio Filesystem device explicitly reported
+ ENOENT -- "No such file or directory".
+
+ @return The "errno" value mapped to an EFI_STATUS code, if the
+ Virtio Filesystem device explicitly reported an error
+ different from ENOENT. If said mapping resulted in
+ EFI_NOT_FOUND, it is remapped to EFI_DEVICE_ERROR.
+
+ @return Error codes propagated from VirtioFsSgListsValidate(),
+ VirtioFsFuseNewRequest(), VirtioFsSgListsSubmit(),
+ VirtioFsFuseCheckResponse(). EFI_NOT_FOUND is remapped
+ to EFI_DEVICE_ERROR.
+**/
+EFI_STATUS
+VirtioFsFuseLookup (
+ IN OUT VIRTIO_FS *VirtioFs,
+ IN UINT64 DirNodeId,
+ IN CHAR8 *Name,
+ OUT UINT64 *NodeId,
+ OUT VIRTIO_FS_FUSE_ATTRIBUTES_RESPONSE *FuseAttr
+ )
+{
+ VIRTIO_FS_FUSE_REQUEST CommonReq;
+ VIRTIO_FS_IO_VECTOR ReqIoVec[2];
+ VIRTIO_FS_SCATTER_GATHER_LIST ReqSgList;
+ VIRTIO_FS_FUSE_RESPONSE CommonResp;
+ VIRTIO_FS_FUSE_NODE_RESPONSE NodeResp;
+ VIRTIO_FS_IO_VECTOR RespIoVec[3];
+ VIRTIO_FS_SCATTER_GATHER_LIST RespSgList;
+ EFI_STATUS Status;
+
+ //
+ // Set up the scatter-gather lists.
+ //
+ ReqIoVec[0].Buffer = &CommonReq;
+ ReqIoVec[0].Size = sizeof CommonReq;
+ ReqIoVec[1].Buffer = Name;
+ ReqIoVec[1].Size = AsciiStrSize (Name);
+ ReqSgList.IoVec = ReqIoVec;
+ ReqSgList.NumVec = ARRAY_SIZE (ReqIoVec);
+
+ RespIoVec[0].Buffer = &CommonResp;
+ RespIoVec[0].Size = sizeof CommonResp;
+ RespIoVec[1].Buffer = &NodeResp;
+ RespIoVec[1].Size = sizeof NodeResp;
+ RespIoVec[2].Buffer = FuseAttr;
+ RespIoVec[2].Size = sizeof *FuseAttr;
+ RespSgList.IoVec = RespIoVec;
+ RespSgList.NumVec = ARRAY_SIZE (RespIoVec);
+
+ //
+ // Validate the scatter-gather lists; calculate the total transfer sizes.
+ //
+ Status = VirtioFsSgListsValidate (VirtioFs, &ReqSgList, &RespSgList);
+ if (EFI_ERROR (Status)) {
+ goto Fail;
+ }
+
+ //
+ // Populate the common request header.
+ //
+ Status = VirtioFsFuseNewRequest (VirtioFs, &CommonReq, ReqSgList.TotalSize,
+ VirtioFsFuseOpLookup, DirNodeId);
+ if (EFI_ERROR (Status)) {
+ goto Fail;
+ }
+
+ //
+ // Submit the request.
+ //
+ Status = VirtioFsSgListsSubmit (VirtioFs, &ReqSgList, &RespSgList);
+ if (EFI_ERROR (Status)) {
+ goto Fail;
+ }
+
+ //
+ // Verify the response (all response buffers are fixed size).
+ //
+ Status = VirtioFsFuseCheckResponse (&RespSgList, CommonReq.Unique, NULL);
+ if (EFI_ERROR (Status)) {
+ if (Status == EFI_DEVICE_ERROR) {
+ DEBUG ((
+ ((CommonResp.Error == VIRTIO_FS_FUSE_ERRNO_ENOENT) ?
+ DEBUG_VERBOSE :
+ DEBUG_ERROR),
+ "%a: Label=\"%s\" DirNodeId=%Lu Name=\"%a\" Errno=%d\n",
+ __FUNCTION__,
+ VirtioFs->Label,
+ DirNodeId,
+ Name,
+ CommonResp.Error
+ ));
+ if (CommonResp.Error == VIRTIO_FS_FUSE_ERRNO_ENOENT) {
+ return EFI_NOT_FOUND;
+ }
+ Status = VirtioFsErrnoToEfiStatus (CommonResp.Error);
+ }
+ goto Fail;
+ }
+
+ //
+ // Output the NodeId to which Name has been resolved to.
+ //
+ *NodeId = NodeResp.NodeId;
+ return EFI_SUCCESS;
+
+Fail:
+ return (Status == EFI_NOT_FOUND) ? EFI_DEVICE_ERROR : Status;
+}
diff --git a/OvmfPkg/VirtioFsDxe/VirtioFsDxe.h b/OvmfPkg/VirtioFsDxe/VirtioFsDxe.h index 6cc5257bab..b2e4adce09 100644 --- a/OvmfPkg/VirtioFsDxe/VirtioFsDxe.h +++ b/OvmfPkg/VirtioFsDxe/VirtioFsDxe.h @@ -237,6 +237,15 @@ VirtioFsFuseAttrToEfiFileInfo ( //
EFI_STATUS
+VirtioFsFuseLookup (
+ IN OUT VIRTIO_FS *VirtioFs,
+ IN UINT64 DirNodeId,
+ IN CHAR8 *Name,
+ OUT UINT64 *NodeId,
+ OUT VIRTIO_FS_FUSE_ATTRIBUTES_RESPONSE *FuseAttr
+ );
+
+EFI_STATUS
VirtioFsFuseForget (
IN OUT VIRTIO_FS *VirtioFs,
IN UINT64 NodeId
diff --git a/OvmfPkg/VirtioFsDxe/VirtioFsDxe.inf b/OvmfPkg/VirtioFsDxe/VirtioFsDxe.inf index 7d72721884..3552ece6b9 100644 --- a/OvmfPkg/VirtioFsDxe/VirtioFsDxe.inf +++ b/OvmfPkg/VirtioFsDxe/VirtioFsDxe.inf @@ -87,6 +87,7 @@ FuseForget.c
FuseFsync.c
FuseInit.c
+ FuseLookup.c
FuseMkDir.c
FuseOpen.c
FuseOpenDir.c
|