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inc: winfsp: add comment regarding limitations of ReadDirectory/Offset

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Bill Zissimopoulos
2016-12-08 09:18:09 -08:00
parent 1d8d72129d
commit 6d1b9e95db
1 changed files with 10 additions and 0 deletions
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inc/winfsp/winfsp.h
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@@ -622,6 +622,16 @@ typedef struct _FSP_FILE_SYSTEM_INTERFACE
* special value 0 indicates that the read should start from the first entries. The first
* two entries returned by ReadDirectory should always be the "." and ".." entries,
* except for the root directory which does not have these entries.
*
* This parameter is used by the WinFsp FSD to break directory listings into chunks.
* In this case all 64-bits of the Offset are valid. In some cases the Windows kernel
* (NTOS) may also use this parameter. In this case only the lower 32-bits of this
* parameter will be valid. This is an unfortunate limitation of Windows (for more
* information see the documentation for IRP_MJ_DIRECTORY_CONTROL and the flag
* SL_INDEX_SPECIFIED).
*
* In practice this means that you should only rely on the lower 32-bits of this value
* to be valid.
* @param Length
* Length of data to read.
* @param Pattern