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+/** @file
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+ FUSE_SETATTR wrapper for the Virtio Filesystem device.
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+
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+ Copyright (C) 2020, Red Hat, Inc.
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+
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+ SPDX-License-Identifier: BSD-2-Clause-Patent
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+**/
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+
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+#include "VirtioFsDxe.h"
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+
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+/**
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+ Send the FUSE_SETATTR request to the Virtio Filesystem device, for changing
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+ the attributes of an inode.
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+
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+ The function may only be called after VirtioFsFuseInitSession() returns
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+ successfully and before VirtioFsUninit() is called.
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+
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+ @param[in,out] VirtioFs The Virtio Filesystem device to send the
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+ FUSE_SETATTR request to. On output, the FUSE request
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+ counter "VirtioFs->RequestId" will have been
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+ incremented.
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+
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+ @param[in] NodeId The inode number representing the regular file or
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+ directory whose attributes should be changed.
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+
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+ @param[in] Size The new size to set for the regular file. If NULL,
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+ then the file size will not be changed. If NodeId
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+ refers to a directory, then the caller is
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+ responsible for passing NULL as Size.
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+
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+ @param[in] Atime The new last access time to set for the regular file
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+ or directory (seconds since the Epoch). If NULL,
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+ then the last access time is not changed.
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+
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+ @param[in] Mtime The new last modification time to set for the
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+ regular file or directory (seconds since the Epoch).
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+ If NULL, then the last modification time is not
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+ changed.
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+
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+ @param[in] Mode The new file mode bits to set for the regular file
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+ or directory. If NULL, then the file mode bits are
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+ not changed.
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+
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+ @retval EFI_SUCCESS The attributes have been updated.
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+
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+ @return The "errno" value mapped to an EFI_STATUS code, if the
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+ Virtio Filesystem device explicitly reported an error.
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+
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+ @return Error codes propagated from VirtioFsSgListsValidate(),
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+ VirtioFsFuseNewRequest(), VirtioFsSgListsSubmit(),
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+ VirtioFsFuseCheckResponse().
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+**/
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+EFI_STATUS
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+VirtioFsFuseSetAttr (
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+ IN OUT VIRTIO_FS *VirtioFs,
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+ IN UINT64 NodeId,
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+ IN UINT64 *Size OPTIONAL,
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+ IN UINT64 *Atime OPTIONAL,
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+ IN UINT64 *Mtime OPTIONAL,
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+ IN UINT32 *Mode OPTIONAL
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+ )
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+{
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+ VIRTIO_FS_FUSE_REQUEST CommonReq;
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+ VIRTIO_FS_FUSE_SETATTR_REQUEST AttrReq;
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+ VIRTIO_FS_IO_VECTOR ReqIoVec[2];
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+ VIRTIO_FS_SCATTER_GATHER_LIST ReqSgList;
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+ VIRTIO_FS_FUSE_RESPONSE CommonResp;
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+ VIRTIO_FS_FUSE_GETATTR_RESPONSE GetAttrResp;
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+ VIRTIO_FS_FUSE_ATTRIBUTES_RESPONSE AttrResp;
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+ VIRTIO_FS_IO_VECTOR RespIoVec[3];
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+ VIRTIO_FS_SCATTER_GATHER_LIST RespSgList;
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+ EFI_STATUS Status;
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+
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+ //
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+ // Set up the scatter-gather lists.
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+ //
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+ ReqIoVec[0].Buffer = &CommonReq;
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+ ReqIoVec[0].Size = sizeof CommonReq;
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+ ReqIoVec[1].Buffer = &AttrReq;
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+ ReqIoVec[1].Size = sizeof AttrReq;
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+ ReqSgList.IoVec = ReqIoVec;
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+ ReqSgList.NumVec = ARRAY_SIZE (ReqIoVec);
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+
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+ RespIoVec[0].Buffer = &CommonResp;
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+ RespIoVec[0].Size = sizeof CommonResp;
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+ RespIoVec[1].Buffer = &GetAttrResp;
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+ RespIoVec[1].Size = sizeof GetAttrResp;
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+ RespIoVec[2].Buffer = &AttrResp;
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+ RespIoVec[2].Size = sizeof AttrResp;
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+ RespSgList.IoVec = RespIoVec;
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+ RespSgList.NumVec = ARRAY_SIZE (RespIoVec);
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+
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+ //
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+ // Validate the scatter-gather lists; calculate the total transfer sizes.
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+ //
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+ Status = VirtioFsSgListsValidate (VirtioFs, &ReqSgList, &RespSgList);
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+ if (EFI_ERROR (Status)) {
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+ return Status;
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+ }
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+
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+ //
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+ // Populate the common request header.
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+ //
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+ Status = VirtioFsFuseNewRequest (VirtioFs, &CommonReq, ReqSgList.TotalSize,
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+ VirtioFsFuseOpSetAttr, NodeId);
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+ if (EFI_ERROR (Status)) {
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+ return Status;
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+ }
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+
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+ //
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+ // Populate the FUSE_SETATTR-specific fields.
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+ //
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+ AttrReq.Valid = 0;
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+ AttrReq.Padding = 0;
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+ AttrReq.FileHandle = 0;
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+ AttrReq.Size = (Size == NULL) ? 0 : *Size;
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+ AttrReq.LockOwner = 0;
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+ AttrReq.Atime = (Atime == NULL) ? 0 : *Atime;
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+ AttrReq.Mtime = (Mtime == NULL) ? 0 : *Mtime;
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+ AttrReq.Ctime = 0;
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+ AttrReq.AtimeNsec = 0;
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+ AttrReq.MtimeNsec = 0;
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+ AttrReq.CtimeNsec = 0;
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+ AttrReq.Mode = (Mode == NULL) ? 0 : *Mode;
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+ AttrReq.Unused4 = 0;
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+ AttrReq.Uid = 0;
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+ AttrReq.Gid = 0;
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+ AttrReq.Unused5 = 0;
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+
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+ if (Size != NULL) {
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+ AttrReq.Valid |= VIRTIO_FS_FUSE_SETATTR_REQ_F_SIZE;
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+ }
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+ if (Atime != NULL) {
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+ AttrReq.Valid |= VIRTIO_FS_FUSE_SETATTR_REQ_F_ATIME;
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+ }
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+ if (Mtime != NULL) {
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+ AttrReq.Valid |= VIRTIO_FS_FUSE_SETATTR_REQ_F_MTIME;
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+ }
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+ if (Mode != NULL) {
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+ AttrReq.Valid |= VIRTIO_FS_FUSE_SETATTR_REQ_F_MODE;
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+ }
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+
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+ //
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+ // Submit the request.
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+ //
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+ Status = VirtioFsSgListsSubmit (VirtioFs, &ReqSgList, &RespSgList);
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+ if (EFI_ERROR (Status)) {
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+ return Status;
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+ }
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+
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+ //
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+ // Verify the response (all response buffers are fixed size).
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+ //
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+ Status = VirtioFsFuseCheckResponse (&RespSgList, CommonReq.Unique, NULL);
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+ if (Status == EFI_DEVICE_ERROR) {
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+ DEBUG ((DEBUG_ERROR, "%a: Label=\"%s\" NodeId=%Lu", __FUNCTION__,
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+ VirtioFs->Label, NodeId));
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+ if (Size != NULL) {
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+ DEBUG ((DEBUG_ERROR, " Size=0x%Lx", *Size));
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+ }
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+ if (Atime != NULL) {
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+ DEBUG ((DEBUG_ERROR, " Atime=%Lu", *Atime));
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+ }
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+ if (Mtime != NULL) {
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+ DEBUG ((DEBUG_ERROR, " Mtime=%Lu", *Mtime));
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+ }
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+ if (Mode != NULL) {
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+ DEBUG ((DEBUG_ERROR, " Mode=0x%x", *Mode)); // no support for octal :/
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+ }
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+ DEBUG ((DEBUG_ERROR, " Errno=%d\n", CommonResp.Error));
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+ Status = VirtioFsErrnoToEfiStatus (CommonResp.Error);
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+ }
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+ return Status;
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+}
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