From: Laszlo Ersek Date: Wed, 16 Dec 2020 21:10:58 +0000 (+0100) Subject: OvmfPkg/VirtioFsDxe: convert FUSE inode attributes to EFI_FILE_INFO X-Git-Tag: edk2-stable202102~295 X-Git-Url: https://git.proxmox.com/?p=mirror_edk2.git;a=commitdiff_plain;h=cd473d41dd8ba0cf400d2f4f4d4803f5dc56068e OvmfPkg/VirtioFsDxe: convert FUSE inode attributes to EFI_FILE_INFO Introduce the VirtioFsFuseAttrToEfiFileInfo() function, for converting FUSE inode attributes to EFI_FILE_INFO. The EpochToEfiTime() function from EmbeddedPkg's TimeBaseLib proves invaluable for converting the file access times. This is the first time we consume TimeBaseLib in OvmfPkg, so add the necessary lib class resolution. We need not modify any ArmVirtPkg DSC files: see commit af5fed90bfbf ("ArmPlatformPkg,ArmVirtPkg: delete redundant PL031 functions", 2017-05-10). Cc: Ard Biesheuvel Cc: Jordan Justen Cc: Philippe Mathieu-Daudé Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=3097 Signed-off-by: Laszlo Ersek Message-Id: <20201216211125.19496-22-lersek@redhat.com> Acked-by: Ard Biesheuvel --- diff --git a/OvmfPkg/Include/IndustryStandard/VirtioFs.h b/OvmfPkg/Include/IndustryStandard/VirtioFs.h index 63aced229e..5d1d990a2d 100644 --- a/OvmfPkg/Include/IndustryStandard/VirtioFs.h +++ b/OvmfPkg/Include/IndustryStandard/VirtioFs.h @@ -84,6 +84,9 @@ typedef struct { // // File mode bitmasks. // +#define VIRTIO_FS_FUSE_MODE_TYPE_MASK 0170000u +#define VIRTIO_FS_FUSE_MODE_TYPE_REG 0100000u +#define VIRTIO_FS_FUSE_MODE_TYPE_DIR 0040000u #define VIRTIO_FS_FUSE_MODE_PERM_RWXU 0000700u #define VIRTIO_FS_FUSE_MODE_PERM_RUSR 0000400u #define VIRTIO_FS_FUSE_MODE_PERM_WUSR 0000200u diff --git a/OvmfPkg/OvmfPkgIa32.dsc b/OvmfPkg/OvmfPkgIa32.dsc index 4ff70674fb..26a013ec35 100644 --- a/OvmfPkg/OvmfPkgIa32.dsc +++ b/OvmfPkg/OvmfPkgIa32.dsc @@ -125,6 +125,7 @@ BaseMemoryLib|MdePkg/Library/BaseMemoryLibRepStr/BaseMemoryLibRepStr.inf BaseLib|MdePkg/Library/BaseLib/BaseLib.inf SafeIntLib|MdePkg/Library/BaseSafeIntLib/BaseSafeIntLib.inf + TimeBaseLib|EmbeddedPkg/Library/TimeBaseLib/TimeBaseLib.inf BmpSupportLib|MdeModulePkg/Library/BaseBmpSupportLib/BaseBmpSupportLib.inf SynchronizationLib|MdePkg/Library/BaseSynchronizationLib/BaseSynchronizationLib.inf CpuLib|MdePkg/Library/BaseCpuLib/BaseCpuLib.inf diff --git a/OvmfPkg/OvmfPkgIa32X64.dsc b/OvmfPkg/OvmfPkgIa32X64.dsc index d40a59183c..10579fe46c 100644 --- a/OvmfPkg/OvmfPkgIa32X64.dsc +++ b/OvmfPkg/OvmfPkgIa32X64.dsc @@ -129,6 +129,7 @@ BaseMemoryLib|MdePkg/Library/BaseMemoryLibRepStr/BaseMemoryLibRepStr.inf BaseLib|MdePkg/Library/BaseLib/BaseLib.inf SafeIntLib|MdePkg/Library/BaseSafeIntLib/BaseSafeIntLib.inf + TimeBaseLib|EmbeddedPkg/Library/TimeBaseLib/TimeBaseLib.inf BmpSupportLib|MdeModulePkg/Library/BaseBmpSupportLib/BaseBmpSupportLib.inf SynchronizationLib|MdePkg/Library/BaseSynchronizationLib/BaseSynchronizationLib.inf CpuLib|MdePkg/Library/BaseCpuLib/BaseCpuLib.inf diff --git a/OvmfPkg/OvmfPkgX64.dsc b/OvmfPkg/OvmfPkgX64.dsc index ec7886235a..c9235e48ad 100644 --- a/OvmfPkg/OvmfPkgX64.dsc +++ b/OvmfPkg/OvmfPkgX64.dsc @@ -129,6 +129,7 @@ BaseMemoryLib|MdePkg/Library/BaseMemoryLibRepStr/BaseMemoryLibRepStr.inf BaseLib|MdePkg/Library/BaseLib/BaseLib.inf SafeIntLib|MdePkg/Library/BaseSafeIntLib/BaseSafeIntLib.inf + TimeBaseLib|EmbeddedPkg/Library/TimeBaseLib/TimeBaseLib.inf BmpSupportLib|MdeModulePkg/Library/BaseBmpSupportLib/BaseBmpSupportLib.inf SynchronizationLib|MdePkg/Library/BaseSynchronizationLib/BaseSynchronizationLib.inf CpuLib|MdePkg/Library/BaseCpuLib/BaseCpuLib.inf diff --git a/OvmfPkg/VirtioFsDxe/Helpers.c b/OvmfPkg/VirtioFsDxe/Helpers.c index 8ffdabfd40..e9582e46bd 100644 --- a/OvmfPkg/VirtioFsDxe/Helpers.c +++ b/OvmfPkg/VirtioFsDxe/Helpers.c @@ -9,6 +9,7 @@ #include // StrLen() #include // CopyMem() #include // AllocatePool() +#include // EpochToEfiTime() #include // Virtio10WriteFeatures() #include "VirtioFsDxe.h" @@ -1589,3 +1590,121 @@ FreeRhsPath8: FreePool (RhsPath8); return Status; } + +/** + Convert select fields of a VIRTIO_FS_FUSE_ATTRIBUTES_RESPONSE object to + corresponding fields in EFI_FILE_INFO. + + @param[in] FuseAttr The VIRTIO_FS_FUSE_ATTRIBUTES_RESPONSE object to + convert the relevant fields from. + + @param[out] FileInfo The EFI_FILE_INFO structure to modify. Importantly, the + FileInfo->Size and FileInfo->FileName fields are not + overwritten. + + @retval EFI_SUCCESS Conversion successful. + + @retval EFI_UNSUPPORTED The allocated size of the file is inexpressible in + EFI_FILE_INFO. + + @retval EFI_UNSUPPORTED One of the file access times is inexpressible in + EFI_FILE_INFO. + + @retval EFI_UNSUPPORTED The file type is inexpressible in EFI_FILE_INFO. + + @retval EFI_UNSUPPORTED The file is a regular file that has multiple names + on the host side (i.e., its hard link count is + greater than one). +**/ +EFI_STATUS +VirtioFsFuseAttrToEfiFileInfo ( + IN VIRTIO_FS_FUSE_ATTRIBUTES_RESPONSE *FuseAttr, + OUT EFI_FILE_INFO *FileInfo + ) +{ + UINT64 EpochTime[3]; + EFI_TIME *ConvertedTime[ARRAY_SIZE (EpochTime)]; + UINTN Idx; + + FileInfo->FileSize = FuseAttr->Size; + + // + // The unit for FuseAttr->Blocks is 512B. + // + if (FuseAttr->Blocks >= BIT55) { + return EFI_UNSUPPORTED; + } + FileInfo->PhysicalSize = LShiftU64 (FuseAttr->Blocks, 9); + + // + // Convert the timestamps. File creation time is not tracked by the Virtio + // Filesystem device, so set FileInfo->CreateTime from FuseAttr->Mtime as + // well. + // + EpochTime[0] = FuseAttr->Mtime; + EpochTime[1] = FuseAttr->Atime; + EpochTime[2] = FuseAttr->Mtime; + ConvertedTime[0] = &FileInfo->CreateTime; + ConvertedTime[1] = &FileInfo->LastAccessTime; + ConvertedTime[2] = &FileInfo->ModificationTime; + + for (Idx = 0; Idx < ARRAY_SIZE (EpochTime); Idx++) { + // + // EpochToEfiTime() takes a UINTN for seconds. + // + if (EpochTime[Idx] > MAX_UINTN) { + return EFI_UNSUPPORTED; + } + // + // Set the following fields in the converted time: Year, Month, Day, Hour, + // Minute, Second, Nanosecond. + // + EpochToEfiTime ((UINTN)EpochTime[Idx], ConvertedTime[Idx]); + // + // The times are all expressed in UTC. Consequently, they are not affected + // by daylight saving. + // + ConvertedTime[Idx]->TimeZone = 0; + ConvertedTime[Idx]->Daylight = 0; + // + // Clear the padding fields. + // + ConvertedTime[Idx]->Pad1 = 0; + ConvertedTime[Idx]->Pad2 = 0; + } + + // + // Set the attributes. + // + switch (FuseAttr->Mode & VIRTIO_FS_FUSE_MODE_TYPE_MASK) { + case VIRTIO_FS_FUSE_MODE_TYPE_DIR: + FileInfo->Attribute = EFI_FILE_DIRECTORY; + break; + case VIRTIO_FS_FUSE_MODE_TYPE_REG: + FileInfo->Attribute = 0; + break; + default: + // + // Other file types are not supported. + // + return EFI_UNSUPPORTED; + } + // + // Report the regular file or directory as read-only if all classes lack + // write permission. + // + if ((FuseAttr->Mode & (VIRTIO_FS_FUSE_MODE_PERM_WUSR | + VIRTIO_FS_FUSE_MODE_PERM_WGRP | + VIRTIO_FS_FUSE_MODE_PERM_WOTH)) == 0) { + FileInfo->Attribute |= EFI_FILE_READ_ONLY; + } + + // + // A hard link count greater than 1 is not supported for regular files. + // + if ((FileInfo->Attribute & EFI_FILE_DIRECTORY) == 0 && FuseAttr->Nlink > 1) { + return EFI_UNSUPPORTED; + } + + return EFI_SUCCESS; +} diff --git a/OvmfPkg/VirtioFsDxe/VirtioFsDxe.h b/OvmfPkg/VirtioFsDxe/VirtioFsDxe.h index 795cf4ee5d..6cc5257bab 100644 --- a/OvmfPkg/VirtioFsDxe/VirtioFsDxe.h +++ b/OvmfPkg/VirtioFsDxe/VirtioFsDxe.h @@ -11,6 +11,7 @@ #define VIRTIO_FS_DXE_H_ #include // SIGNATURE_64() +#include // EFI_FILE_INFO #include // VIRTIO_FS_TAG_BYTES #include // CR() #include // EFI_SIMPLE_FILE_SYSTEM_PROTOCOL @@ -225,6 +226,12 @@ VirtioFsAppendPath ( OUT BOOLEAN *RootEscape ); +EFI_STATUS +VirtioFsFuseAttrToEfiFileInfo ( + IN VIRTIO_FS_FUSE_ATTRIBUTES_RESPONSE *FuseAttr, + OUT EFI_FILE_INFO *FileInfo + ); + // // Wrapper functions for FUSE commands (primitives). // diff --git a/OvmfPkg/VirtioFsDxe/VirtioFsDxe.inf b/OvmfPkg/VirtioFsDxe/VirtioFsDxe.inf index b942baa4a7..7d72721884 100644 --- a/OvmfPkg/VirtioFsDxe/VirtioFsDxe.inf +++ b/OvmfPkg/VirtioFsDxe/VirtioFsDxe.inf @@ -77,6 +77,7 @@ ENTRY_POINT = VirtioFsEntryPoint [Packages] + EmbeddedPkg/EmbeddedPkg.dec MdePkg/MdePkg.dec OvmfPkg/OvmfPkg.dec @@ -110,6 +111,7 @@ BaseMemoryLib DebugLib MemoryAllocationLib + TimeBaseLib UefiBootServicesTableLib UefiDriverEntryPoint VirtioLib