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sys,dll,inc: implement new Delete design and POSIX semantics

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This commit is contained in:
Bill Zissimopoulos
2021-10-19 15:23:15 +01:00
parent 3e66082f11
commit 19823d84de
15 changed files with 424 additions and 74 deletions
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98
tst/memfs/memfs.cpp
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@ -88,6 +88,13 @@ FSP_FSCTL_STATIC_ASSERT(MEMFS_MAX_PATH > MAX_PATH,
#define MEMFS_REJECT_EARLY_IRP
#endif
/*
* Define the MEMFS_DELETE macro to include new Delete support
* (instead of Cleanup/FspCleanupDelete). This is required to
* properly support POSIX unlink/rename.
*/
#define MEMFS_DELETE
/*
* Define the DEBUG_BUFFER_CHECK macro on Windows 8 or above. This includes
* a check for the Write buffer to ensure that it is read-only.
@ -965,6 +972,8 @@ void SlowioReadDirectoryThread(
* FSP_FILE_SYSTEM_INTERFACE
*/
static NTSTATUS Delete(FSP_FILE_SYSTEM *FileSystem,
PVOID FileNode0, PWSTR FileName, ULONG Flags);
#if defined(MEMFS_REPARSE_POINTS)
static NTSTATUS GetReparsePointByName(
FSP_FILE_SYSTEM *FileSystem, PVOID Context,
@ -1347,7 +1356,9 @@ static VOID Cleanup(FSP_FILE_SYSTEM *FileSystem,
MEMFS_FILE_NODE *MainFileNode = FileNode;
#endif
#if !defined(MEMFS_DELETE)
assert(0 != Flags); /* FSP_FSCTL_VOLUME_PARAMS::PostCleanupWhenModifiedOnly ensures this */
#endif
if (Flags & FspCleanupSetArchiveBit)
{
@ -1376,21 +1387,10 @@ static VOID Cleanup(FSP_FILE_SYSTEM *FileSystem,
SetFileSizeInternal(FileSystem, FileNode, AllocationSize, TRUE);
}
if ((Flags & FspCleanupDelete) && !MemfsFileNodeMapHasChild(Memfs->FileNodeMap, FileNode))
{
#if defined(MEMFS_NAMED_STREAMS)
MEMFS_FILE_NODE_MAP_ENUM_CONTEXT Context = { FALSE };
ULONG Index;
MemfsFileNodeMapEnumerateNamedStreams(Memfs->FileNodeMap, FileNode,
MemfsFileNodeMapEnumerateFn, &Context);
for (Index = 0; Context.Count > Index; Index++)
MemfsFileNodeMapRemove(Memfs->FileNodeMap, Context.FileNodes[Index]);
MemfsFileNodeMapEnumerateFree(&Context);
#if !defined(MEMFS_DELETE)
if (Flags & FspCleanupDelete)
Delete(FileSystem, FileNode0, FileName, -1);
#endif
MemfsFileNodeMapRemove(Memfs->FileNodeMap, FileNode);
}
}
static VOID Close(FSP_FILE_SYSTEM *FileSystem,
@ -1651,17 +1651,13 @@ static NTSTATUS SetFileSize(FSP_FILE_SYSTEM *FileSystem,
return STATUS_SUCCESS;
}
#if !defined(MEMFS_DELETE)
static NTSTATUS CanDelete(FSP_FILE_SYSTEM *FileSystem,
PVOID FileNode0, PWSTR FileName)
{
MEMFS *Memfs = (MEMFS *)FileSystem->UserContext;
MEMFS_FILE_NODE *FileNode = (MEMFS_FILE_NODE *)FileNode0;
if (MemfsFileNodeMapHasChild(Memfs->FileNodeMap, FileNode))
return STATUS_DIRECTORY_NOT_EMPTY;
return STATUS_SUCCESS;
return Delete(FileSystem, FileNode0, FileName, FILE_DISPOSITION_DELETE);
}
#endif
static NTSTATUS Rename(FSP_FILE_SYSTEM *FileSystem,
PVOID FileNode0,
@ -2231,6 +2227,54 @@ static NTSTATUS SetEa(FSP_FILE_SYSTEM *FileSystem,
}
#endif
static NTSTATUS Delete(FSP_FILE_SYSTEM *FileSystem,
PVOID FileNode0, PWSTR FileName, ULONG Flags)
{
MEMFS *Memfs = (MEMFS *)FileSystem->UserContext;
MEMFS_FILE_NODE *FileNode = (MEMFS_FILE_NODE *)FileNode0;
switch (Flags)
{
case FILE_DISPOSITION_DO_NOT_DELETE:
// set file disposition flag: do not delete file at Cleanup
return STATUS_SUCCESS;
case FILE_DISPOSITION_DELETE:
// set file disposition flag: delete file at Cleanup
if (MemfsFileNodeMapHasChild(Memfs->FileNodeMap, FileNode))
return STATUS_DIRECTORY_NOT_EMPTY;
return STATUS_SUCCESS;
case FILE_DISPOSITION_DELETE | FILE_DISPOSITION_POSIX_SEMANTICS:
// delete file now; open handles to file remain valid
/* fallthrough */
case -1:
// delete file now; called during Cleanup
if (MemfsFileNodeMapHasChild(Memfs->FileNodeMap, FileNode))
return STATUS_DIRECTORY_NOT_EMPTY;
else
{
#if defined(MEMFS_NAMED_STREAMS)
MEMFS_FILE_NODE_MAP_ENUM_CONTEXT Context = { FALSE };
ULONG Index;
MemfsFileNodeMapEnumerateNamedStreams(Memfs->FileNodeMap, FileNode,
MemfsFileNodeMapEnumerateFn, &Context);
for (Index = 0; Context.Count > Index; Index++)
MemfsFileNodeMapRemove(Memfs->FileNodeMap, Context.FileNodes[Index]);
MemfsFileNodeMapEnumerateFree(&Context);
#endif
MemfsFileNodeMapRemove(Memfs->FileNodeMap, FileNode);
return STATUS_SUCCESS;
}
default:
return STATUS_INVALID_PARAMETER;
}
}
static FSP_FILE_SYSTEM_INTERFACE MemfsInterface =
{
GetVolumeInfo,
@ -2255,7 +2299,11 @@ static FSP_FILE_SYSTEM_INTERFACE MemfsInterface =
GetFileInfo,
SetBasicInfo,
SetFileSize,
#if !defined(MEMFS_DELETE)
CanDelete,
#else
0,
#endif
Rename,
GetSecurity,
SetSecurity,
@ -2293,11 +2341,15 @@ static FSP_FILE_SYSTEM_INTERFACE MemfsInterface =
#if defined(MEMFS_EA)
Overwrite,
GetEa,
SetEa
SetEa,
#else
0,
0,
0,
#endif
#if defined(MEMFS_DELETE)
Delete,
#else
0,
#endif
};
@ -2323,6 +2375,7 @@ NTSTATUS MemfsCreateFunnel(
FSP_FSCTL_VOLUME_PARAMS VolumeParams;
BOOLEAN CaseInsensitive = !!(Flags & MemfsCaseInsensitive);
BOOLEAN FlushAndPurgeOnCleanup = !!(Flags & MemfsFlushAndPurgeOnCleanup);
BOOLEAN SupportsPosixUnlinkRename = !(Flags & MemfsLegacyUnlinkRename);
PWSTR DevicePath = MemfsNet == (Flags & MemfsDeviceMask) ?
L"" FSP_FSCTL_NET_DEVICE_NAME : L"" FSP_FSCTL_DISK_DEVICE_NAME;
UINT64 AllocationUnit;
@ -2404,6 +2457,7 @@ NTSTATUS MemfsCreateFunnel(
#if defined(MEMFS_REJECT_EARLY_IRP)
VolumeParams.RejectIrpPriorToTransact0 = 1;
#endif
VolumeParams.SupportsPosixUnlinkRename = SupportsPosixUnlinkRename;
if (0 != VolumePrefix)
wcscpy_s(VolumeParams.Prefix, sizeof VolumeParams.Prefix / sizeof(WCHAR), VolumePrefix);
wcscpy_s(VolumeParams.FileSystemName, sizeof VolumeParams.FileSystemName / sizeof(WCHAR),