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sys: FspFileNodeFlushAndPurgeCache: wrap Cc* calls in try/except

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This commit is contained in:
Bill Zissimopoulos 2016-03-17 10:46:05 -07:00
parent b734e6968d
commit 15f39c3ca8
1 changed files with 28 additions and 19 deletions
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47
src/sys/file.c
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@ -545,7 +545,7 @@ NTSTATUS FspFileNodeFlushAndPurgeCache(FSP_FILE_NODE *FileNode,
LARGE_INTEGER FlushOffset;
PLARGE_INTEGER PFlushOffset = &FlushOffset;
FSP_FSCTL_FILE_INFO FileInfo;
IO_STATUS_BLOCK IoStatus = { 0 };
IO_STATUS_BLOCK IoStatus = { STATUS_SUCCESS };
FlushOffset.QuadPart = FlushOffset64;
if (FILE_WRITE_TO_END_OF_FILE == FlushOffset.LowPart && -1L == FlushOffset.HighPart)
@ -556,29 +556,38 @@ NTSTATUS FspFileNodeFlushAndPurgeCache(FSP_FILE_NODE *FileNode,
PFlushOffset = 0; /* we don't know how big the file is, so flush it all! */
}
if (0 != FspMvCcCoherencyFlushAndPurgeCache)
/* it is unclear if the Cc* calls below can raise or not; wrap them just in case */
try
{
/* if we are on Win7+ use CcCoherencyFlushAndPurgeCache */
FspMvCcCoherencyFlushAndPurgeCache(
&FileNode->NonPaged->SectionObjectPointers, PFlushOffset, FlushLength, &IoStatus,
FlushAndPurge ? 0 : CC_FLUSH_AND_PURGE_NO_PURGE);
if (0 != FspMvCcCoherencyFlushAndPurgeCache)
{
/* if we are on Win7+ use CcCoherencyFlushAndPurgeCache */
FspMvCcCoherencyFlushAndPurgeCache(
&FileNode->NonPaged->SectionObjectPointers, PFlushOffset, FlushLength, &IoStatus,
FlushAndPurge ? 0 : CC_FLUSH_AND_PURGE_NO_PURGE);
return STATUS_CACHE_PAGE_LOCKED == IoStatus.Status ?
STATUS_SUCCESS/* liar! */:
IoStatus.Status;
if (STATUS_CACHE_PAGE_LOCKED == IoStatus.Status)
IoStatus.Status = STATUS_SUCCESS;
}
else
{
/* do it the old-fashioned way; non-cached and mmap'ed I/O are non-coherent */
CcFlushCache(&FileNode->NonPaged->SectionObjectPointers, PFlushOffset, FlushLength, &IoStatus);
if (NT_SUCCESS(IoStatus.Status))
{
if (FlushAndPurge)
CcPurgeCacheSection(&FileNode->NonPaged->SectionObjectPointers, PFlushOffset, FlushLength, FALSE);
IoStatus.Status = STATUS_SUCCESS;
}
}
}
else
except (EXCEPTION_EXECUTE_HANDLER)
{
/* do it the old-fashioned way; non-cached and mmap'ed I/O are non-coherent */
CcFlushCache(&FileNode->NonPaged->SectionObjectPointers, PFlushOffset, FlushLength, &IoStatus);
if (!NT_SUCCESS(IoStatus.Status))
return IoStatus.Status;
if (FlushAndPurge)
CcPurgeCacheSection(&FileNode->NonPaged->SectionObjectPointers, PFlushOffset, FlushLength, FALSE);
return STATUS_SUCCESS;
IoStatus.Status = GetExceptionCode();
}
return IoStatus.Status;
}
VOID FspFileNodeRename(FSP_FILE_NODE *FileNode, PUNICODE_STRING NewFileName)