diff --git a/ntoskrnl/cc/fs.c b/ntoskrnl/cc/fs.c index e31a17b87b6..5798f56a91a 100644 --- a/ntoskrnl/cc/fs.c +++ b/ntoskrnl/cc/fs.c @@ -301,6 +301,43 @@ CcSetFileSizes ( 0, FALSE); } + else + { + PROS_VACB LastVacb; + + /* + * If file (allocation) size has increased, then we need to check whether + * it just grows in a single VACB (the last one). + * If so, we must mark the VACB as invalid to trigger a read to the + * FSD at the next VACB usage, and thus avoid returning garbage + */ + + /* Check for allocation size and the last VACB */ + if (SharedCacheMap->SectionSize.QuadPart < FileSizes->AllocationSize.QuadPart && + SharedCacheMap->SectionSize.QuadPart % VACB_MAPPING_GRANULARITY) + { + LastVacb = CcRosLookupVacb(SharedCacheMap, + SharedCacheMap->SectionSize.QuadPart); + if (LastVacb != NULL) + { + /* Mark it as invalid */ + CcRosReleaseVacb(SharedCacheMap, LastVacb, LastVacb->Dirty ? LastVacb->Valid : FALSE, FALSE, FALSE); + } + } + + /* Check for file size and the last VACB */ + if (SharedCacheMap->FileSize.QuadPart < FileSizes->FileSize.QuadPart && + SharedCacheMap->FileSize.QuadPart % VACB_MAPPING_GRANULARITY) + { + LastVacb = CcRosLookupVacb(SharedCacheMap, + SharedCacheMap->FileSize.QuadPart); + if (LastVacb != NULL) + { + /* Mark it as invalid */ + CcRosReleaseVacb(SharedCacheMap, LastVacb, LastVacb->Dirty ? LastVacb->Valid : FALSE, FALSE, FALSE); + } + } + } KeAcquireSpinLock(&SharedCacheMap->CacheMapLock, &oldirql); SharedCacheMap->SectionSize = FileSizes->AllocationSize;