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