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b62a0c56 LE |
1 | /** @file\r |
2 | FUSE_OPENDIR wrapper for the Virtio Filesystem device.\r | |
3 | \r | |
4 | Copyright (C) 2020, Red Hat, Inc.\r | |
5 | \r | |
6 | SPDX-License-Identifier: BSD-2-Clause-Patent\r | |
7 | **/\r | |
8 | \r | |
9 | #include "VirtioFsDxe.h"\r | |
10 | \r | |
11 | /**\r | |
12 | Send a FUSE_OPENDIR request to the Virtio Filesystem device, for opening a\r | |
13 | directory.\r | |
14 | \r | |
15 | The function may only be called after VirtioFsFuseInitSession() returns\r | |
16 | successfully and before VirtioFsUninit() is called.\r | |
17 | \r | |
18 | @param[in,out] VirtioFs The Virtio Filesystem device to send the\r | |
19 | FUSE_OPENDIR request to. On output, the FUSE request\r | |
20 | counter "VirtioFs->RequestId" will have been\r | |
21 | incremented.\r | |
22 | \r | |
23 | @param[in] NodeId The inode number of the directory to open.\r | |
24 | \r | |
25 | @param[out] FuseHandle The open file handle returned by the Virtio\r | |
26 | Filesystem device.\r | |
27 | \r | |
28 | @retval EFI_SUCCESS The directory has been opened.\r | |
29 | \r | |
30 | @return The "errno" value mapped to an EFI_STATUS code, if the\r | |
31 | Virtio Filesystem device explicitly reported an error.\r | |
32 | \r | |
33 | @return Error codes propagated from VirtioFsSgListsValidate(),\r | |
34 | VirtioFsFuseNewRequest(), VirtioFsSgListsSubmit(),\r | |
35 | VirtioFsFuseCheckResponse().\r | |
36 | **/\r | |
37 | EFI_STATUS\r | |
38 | VirtioFsFuseOpenDir (\r | |
ac0a286f MK |
39 | IN OUT VIRTIO_FS *VirtioFs,\r |
40 | IN UINT64 NodeId,\r | |
41 | OUT UINT64 *FuseHandle\r | |
b62a0c56 LE |
42 | )\r |
43 | {\r | |
ac0a286f MK |
44 | VIRTIO_FS_FUSE_REQUEST CommonReq;\r |
45 | VIRTIO_FS_FUSE_OPEN_REQUEST OpenReq;\r | |
46 | VIRTIO_FS_IO_VECTOR ReqIoVec[2];\r | |
47 | VIRTIO_FS_SCATTER_GATHER_LIST ReqSgList;\r | |
48 | VIRTIO_FS_FUSE_RESPONSE CommonResp;\r | |
49 | VIRTIO_FS_FUSE_OPEN_RESPONSE OpenResp;\r | |
50 | VIRTIO_FS_IO_VECTOR RespIoVec[2];\r | |
51 | VIRTIO_FS_SCATTER_GATHER_LIST RespSgList;\r | |
52 | EFI_STATUS Status;\r | |
b62a0c56 LE |
53 | \r |
54 | //\r | |
55 | // Set up the scatter-gather lists.\r | |
56 | //\r | |
57 | ReqIoVec[0].Buffer = &CommonReq;\r | |
58 | ReqIoVec[0].Size = sizeof CommonReq;\r | |
59 | ReqIoVec[1].Buffer = &OpenReq;\r | |
60 | ReqIoVec[1].Size = sizeof OpenReq;\r | |
61 | ReqSgList.IoVec = ReqIoVec;\r | |
62 | ReqSgList.NumVec = ARRAY_SIZE (ReqIoVec);\r | |
63 | \r | |
64 | RespIoVec[0].Buffer = &CommonResp;\r | |
65 | RespIoVec[0].Size = sizeof CommonResp;\r | |
66 | RespIoVec[1].Buffer = &OpenResp;\r | |
67 | RespIoVec[1].Size = sizeof OpenResp;\r | |
68 | RespSgList.IoVec = RespIoVec;\r | |
69 | RespSgList.NumVec = ARRAY_SIZE (RespIoVec);\r | |
70 | \r | |
71 | //\r | |
72 | // Validate the scatter-gather lists; calculate the total transfer sizes.\r | |
73 | //\r | |
74 | Status = VirtioFsSgListsValidate (VirtioFs, &ReqSgList, &RespSgList);\r | |
75 | if (EFI_ERROR (Status)) {\r | |
76 | return Status;\r | |
77 | }\r | |
78 | \r | |
79 | //\r | |
80 | // Populate the common request header.\r | |
81 | //\r | |
ac0a286f MK |
82 | Status = VirtioFsFuseNewRequest (\r |
83 | VirtioFs,\r | |
84 | &CommonReq,\r | |
85 | ReqSgList.TotalSize,\r | |
86 | VirtioFsFuseOpOpenDir,\r | |
87 | NodeId\r | |
88 | );\r | |
b62a0c56 LE |
89 | if (EFI_ERROR (Status)) {\r |
90 | return Status;\r | |
91 | }\r | |
92 | \r | |
93 | //\r | |
94 | // Populate the FUSE_OPENDIR-specific fields.\r | |
95 | //\r | |
96 | OpenReq.Flags = 0;\r | |
97 | OpenReq.Unused = 0;\r | |
98 | \r | |
99 | //\r | |
100 | // Submit the request.\r | |
101 | //\r | |
102 | Status = VirtioFsSgListsSubmit (VirtioFs, &ReqSgList, &RespSgList);\r | |
103 | if (EFI_ERROR (Status)) {\r | |
104 | return Status;\r | |
105 | }\r | |
106 | \r | |
107 | //\r | |
108 | // Verify the response (all response buffers are fixed size).\r | |
109 | //\r | |
110 | Status = VirtioFsFuseCheckResponse (&RespSgList, CommonReq.Unique, NULL);\r | |
111 | if (EFI_ERROR (Status)) {\r | |
112 | if (Status == EFI_DEVICE_ERROR) {\r | |
ac0a286f MK |
113 | DEBUG ((\r |
114 | DEBUG_ERROR,\r | |
115 | "%a: Label=\"%s\" NodeId=%Lu Errno=%d\n",\r | |
116 | __FUNCTION__,\r | |
117 | VirtioFs->Label,\r | |
118 | NodeId,\r | |
119 | CommonResp.Error\r | |
120 | ));\r | |
b62a0c56 LE |
121 | Status = VirtioFsErrnoToEfiStatus (CommonResp.Error);\r |
122 | }\r | |
ac0a286f | 123 | \r |
b62a0c56 LE |
124 | return Status;\r |
125 | }\r | |
126 | \r | |
127 | //\r | |
128 | // Output the open file handle.\r | |
129 | //\r | |
130 | *FuseHandle = OpenResp.FileHandle;\r | |
131 | return EFI_SUCCESS;\r | |
132 | }\r |