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334c13e1 LE |
1 | /** @file\r |
2 | EFI_FILE_PROTOCOL.Write() member function for the Virtio Filesystem driver.\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 | EFI_STATUS\r | |
12 | EFIAPI\r | |
13 | VirtioFsSimpleFileWrite (\r | |
ac0a286f MK |
14 | IN EFI_FILE_PROTOCOL *This,\r |
15 | IN OUT UINTN *BufferSize,\r | |
16 | IN VOID *Buffer\r | |
334c13e1 LE |
17 | )\r |
18 | {\r | |
ac0a286f MK |
19 | VIRTIO_FS_FILE *VirtioFsFile;\r |
20 | VIRTIO_FS *VirtioFs;\r | |
21 | EFI_STATUS Status;\r | |
22 | UINTN Transferred;\r | |
23 | UINTN Left;\r | |
44f43f94 LE |
24 | \r |
25 | VirtioFsFile = VIRTIO_FS_FILE_FROM_SIMPLE_FILE (This);\r | |
26 | VirtioFs = VirtioFsFile->OwnerFs;\r | |
27 | \r | |
28 | if (VirtioFsFile->IsDirectory) {\r | |
29 | return EFI_UNSUPPORTED;\r | |
30 | }\r | |
ac0a286f | 31 | \r |
44f43f94 LE |
32 | if (!VirtioFsFile->IsOpenForWriting) {\r |
33 | return EFI_ACCESS_DENIED;\r | |
34 | }\r | |
35 | \r | |
36 | Status = EFI_SUCCESS;\r | |
37 | Transferred = 0;\r | |
38 | Left = *BufferSize;\r | |
39 | while (Left > 0) {\r | |
ac0a286f | 40 | UINT32 WriteSize;\r |
44f43f94 LE |
41 | \r |
42 | //\r | |
43 | // Honor the write buffer size limit.\r | |
44 | //\r | |
45 | WriteSize = (UINT32)MIN ((UINTN)VirtioFs->MaxWrite, Left);\r | |
ac0a286f MK |
46 | Status = VirtioFsFuseWrite (\r |
47 | VirtioFs,\r | |
48 | VirtioFsFile->NodeId,\r | |
49 | VirtioFsFile->FuseHandle,\r | |
50 | VirtioFsFile->FilePosition + Transferred,\r | |
51 | &WriteSize,\r | |
52 | (UINT8 *)Buffer + Transferred\r | |
53 | );\r | |
54 | if (!EFI_ERROR (Status) && (WriteSize == 0)) {\r | |
44f43f94 LE |
55 | //\r |
56 | // Progress should have been made.\r | |
57 | //\r | |
58 | Status = EFI_DEVICE_ERROR;\r | |
59 | }\r | |
ac0a286f | 60 | \r |
44f43f94 LE |
61 | if (EFI_ERROR (Status)) {\r |
62 | break;\r | |
63 | }\r | |
ac0a286f | 64 | \r |
44f43f94 LE |
65 | Transferred += WriteSize;\r |
66 | Left -= WriteSize;\r | |
67 | }\r | |
68 | \r | |
ac0a286f | 69 | *BufferSize = Transferred;\r |
44f43f94 LE |
70 | VirtioFsFile->FilePosition += Transferred;\r |
71 | //\r | |
72 | // According to the UEFI spec,\r | |
73 | //\r | |
74 | // - 'Partial writes only occur when there has been a data error during the\r | |
75 | // write attempt (such as "file space full")', and\r | |
76 | //\r | |
77 | // - (as an example) EFI_VOLUME_FULL is returned when 'The volume is full'.\r | |
78 | //\r | |
79 | // These together imply that after a partial write, we have to return an\r | |
80 | // error. In other words, (Transferred > 0) is inconsequential for the return\r | |
81 | // value.\r | |
82 | //\r | |
83 | return Status;\r | |
334c13e1 | 84 | }\r |