diff options
| -rw-r--r-- | OvmfPkg/Include/IndustryStandard/VirtioFs.h | 3 | ||||
| -rw-r--r-- | OvmfPkg/VirtioFsDxe/Helpers.c | 95 | ||||
| -rw-r--r-- | OvmfPkg/VirtioFsDxe/VirtioFsDxe.h | 8 |
3 files changed, 106 insertions, 0 deletions
diff --git a/OvmfPkg/Include/IndustryStandard/VirtioFs.h b/OvmfPkg/Include/IndustryStandard/VirtioFs.h index 15fb28f95a..dee437ec0d 100644 --- a/OvmfPkg/Include/IndustryStandard/VirtioFs.h +++ b/OvmfPkg/Include/IndustryStandard/VirtioFs.h @@ -95,12 +95,15 @@ typedef struct { #define VIRTIO_FS_FUSE_MODE_PERM_RWXU 0000700u
#define VIRTIO_FS_FUSE_MODE_PERM_RUSR 0000400u
#define VIRTIO_FS_FUSE_MODE_PERM_WUSR 0000200u
+#define VIRTIO_FS_FUSE_MODE_PERM_XUSR 0000100u
#define VIRTIO_FS_FUSE_MODE_PERM_RWXG 0000070u
#define VIRTIO_FS_FUSE_MODE_PERM_RGRP 0000040u
#define VIRTIO_FS_FUSE_MODE_PERM_WGRP 0000020u
+#define VIRTIO_FS_FUSE_MODE_PERM_XGRP 0000010u
#define VIRTIO_FS_FUSE_MODE_PERM_RWXO 0000007u
#define VIRTIO_FS_FUSE_MODE_PERM_ROTH 0000004u
#define VIRTIO_FS_FUSE_MODE_PERM_WOTH 0000002u
+#define VIRTIO_FS_FUSE_MODE_PERM_XOTH 0000001u
//
// Flags for VirtioFsFuseOpSetAttr, in the VIRTIO_FS_FUSE_SETATTR_REQUEST.Valid
diff --git a/OvmfPkg/VirtioFsDxe/Helpers.c b/OvmfPkg/VirtioFsDxe/Helpers.c index c56c60640a..443bbdc616 100644 --- a/OvmfPkg/VirtioFsDxe/Helpers.c +++ b/OvmfPkg/VirtioFsDxe/Helpers.c @@ -2319,3 +2319,98 @@ VirtioFsGetFuseTimeUpdates ( return EFI_SUCCESS;
}
+
+/**
+ Given an EFI_FILE_INFO object received in an EFI_FILE_PROTOCOL.SetInfo()
+ call, determine whether updating the file mode bits of the file is necessary,
+ relative to an EFI_FILE_INFO object describing the current state of the file.
+
+ @param[in] Info The EFI_FILE_INFO describing the current state of the
+ file. The caller is responsible for populating Info on
+ input with VirtioFsFuseAttrToEfiFileInfo(), from the
+ current FUSE attributes of the file. The Info->Size and
+ Info->FileName members are ignored.
+
+ @param[in] NewInfo The EFI_FILE_INFO object received in the
+ EFI_FILE_PROTOCOL.SetInfo() call.
+
+ @param[out] Update Set to TRUE on output if the file mode bits need to be
+ updated. Set to FALSE otherwise.
+
+ @param[out] Mode If Update is set to TRUE, then Mode provides the file
+ mode bits to set. Otherwise, Mode is not written to.
+
+ @retval EFI_SUCCESS Output parameters have been set successfully.
+
+ @retval EFI_ACCESS_DENIED NewInfo requests toggling an unknown bit in the
+ Attribute bitmask.
+
+ @retval EFI_ACCESS_DENIED NewInfo requests toggling EFI_FILE_DIRECTORY in
+ the Attribute bitmask.
+**/
+EFI_STATUS
+VirtioFsGetFuseModeUpdate (
+ IN EFI_FILE_INFO *Info,
+ IN EFI_FILE_INFO *NewInfo,
+ OUT BOOLEAN *Update,
+ OUT UINT32 *Mode
+ )
+{
+ UINT64 Toggle;
+ BOOLEAN IsDirectory;
+ BOOLEAN IsWriteable;
+ BOOLEAN WillBeWriteable;
+
+ Toggle = Info->Attribute ^ NewInfo->Attribute;
+ if ((Toggle & ~EFI_FILE_VALID_ATTR) != 0) {
+ //
+ // Unknown attribute requested.
+ //
+ return EFI_ACCESS_DENIED;
+ }
+ if ((Toggle & EFI_FILE_DIRECTORY) != 0) {
+ //
+ // EFI_FILE_DIRECTORY cannot be toggled.
+ //
+ return EFI_ACCESS_DENIED;
+ }
+
+ IsDirectory = (BOOLEAN)((Info->Attribute & EFI_FILE_DIRECTORY) != 0);
+ IsWriteable = (BOOLEAN)((Info->Attribute & EFI_FILE_READ_ONLY) == 0);
+ WillBeWriteable = (BOOLEAN)((NewInfo->Attribute & EFI_FILE_READ_ONLY) == 0);
+
+ if (IsWriteable == WillBeWriteable) {
+ *Update = FALSE;
+ return EFI_SUCCESS;
+ }
+
+ if (IsDirectory) {
+ if (WillBeWriteable) {
+ *Mode = (VIRTIO_FS_FUSE_MODE_PERM_RWXU |
+ VIRTIO_FS_FUSE_MODE_PERM_RWXG |
+ VIRTIO_FS_FUSE_MODE_PERM_RWXO);
+ } else {
+ *Mode = (VIRTIO_FS_FUSE_MODE_PERM_RUSR |
+ VIRTIO_FS_FUSE_MODE_PERM_XUSR |
+ VIRTIO_FS_FUSE_MODE_PERM_RGRP |
+ VIRTIO_FS_FUSE_MODE_PERM_XGRP |
+ VIRTIO_FS_FUSE_MODE_PERM_ROTH |
+ VIRTIO_FS_FUSE_MODE_PERM_XOTH);
+ }
+ } else {
+ if (WillBeWriteable) {
+ *Mode = (VIRTIO_FS_FUSE_MODE_PERM_RUSR |
+ VIRTIO_FS_FUSE_MODE_PERM_WUSR |
+ VIRTIO_FS_FUSE_MODE_PERM_RGRP |
+ VIRTIO_FS_FUSE_MODE_PERM_WGRP |
+ VIRTIO_FS_FUSE_MODE_PERM_ROTH |
+ VIRTIO_FS_FUSE_MODE_PERM_WOTH);
+ } else {
+ *Mode = (VIRTIO_FS_FUSE_MODE_PERM_RUSR |
+ VIRTIO_FS_FUSE_MODE_PERM_RGRP |
+ VIRTIO_FS_FUSE_MODE_PERM_ROTH);
+ }
+ }
+ *Update = TRUE;
+ return EFI_SUCCESS;
+}
diff --git a/OvmfPkg/VirtioFsDxe/VirtioFsDxe.h b/OvmfPkg/VirtioFsDxe/VirtioFsDxe.h index 4331cabbd4..3c3eb1ac93 100644 --- a/OvmfPkg/VirtioFsDxe/VirtioFsDxe.h +++ b/OvmfPkg/VirtioFsDxe/VirtioFsDxe.h @@ -300,6 +300,14 @@ VirtioFsGetFuseTimeUpdates ( OUT UINT64 *Mtime
);
+EFI_STATUS
+VirtioFsGetFuseModeUpdate (
+ IN EFI_FILE_INFO *Info,
+ IN EFI_FILE_INFO *NewInfo,
+ OUT BOOLEAN *Update,
+ OUT UINT32 *Mode
+ );
+
//
// Wrapper functions for FUSE commands (primitives).
//
|