projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 |