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sys, dll: reparse point (symbolic link) support: WIP
This commit is contained in:
Bill Zissimopoulos
@ -124,7 +124,9 @@ typedef struct
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UINT32 CasePreservedNames:1; /* file system preserves the case of file names */
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UINT32 UnicodeOnDisk:1; /* file system supports Unicode in file names */
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UINT32 PersistentAcls:1; /* file system preserves and enforces access control lists */
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UINT32 ReparsePoints:1; /* file system supports reparse points (!!!: unimplemented) */
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UINT32 ReparsePoints:1; /* file system supports reparse points */
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UINT32 ReparsePointPrivilegeCheck:1;/* file system perform reparse point privilege checks */
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UINT32 SymbolicLinksOnly:1; /* file system supports only symbolic link reparse points */
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UINT32 NamedStreams:1; /* file system supports named streams (!!!: unimplemented) */
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UINT32 HardLinks:1; /* unimplemented; set to 0 */
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UINT32 ExtendedAttributes:1; /* unimplemented; set to 0 */
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@ -288,6 +290,13 @@ typedef struct
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FSP_FSCTL_TRANSACT_BUF Pattern;
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} QueryDirectory;
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struct
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{
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UINT64 UserContext;
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UINT64 UserContext2;
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UINT32 FsControlCode;
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FSP_FSCTL_TRANSACT_BUF Buffer;
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} FileSystemControl;
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struct
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{
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UINT64 UserContext;
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UINT64 UserContext2;
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@ -328,9 +337,10 @@ typedef struct
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FSP_FSCTL_FILE_INFO FileInfo;
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} Opened;
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/* IoStatus.Status == STATUS_REPARSE */
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struct
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union
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{
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FSP_FSCTL_TRANSACT_BUF FileName; /* file name to use for STATUS_REPARSE */
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FSP_FSCTL_TRANSACT_BUF FileName; /* IoStatus.Information == IO_REPARSE (== 0) */
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FSP_FSCTL_TRANSACT_BUF Data; /* IoStatus.Information > IO_REMOUNT (== 1) */
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} Reparse;
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} Create;
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struct
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@ -358,6 +368,10 @@ typedef struct
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FSP_FSCTL_VOLUME_INFO VolumeInfo;
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} SetVolumeInformation;
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struct
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{
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FSP_FSCTL_TRANSACT_BUF Buffer;
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} FileSystemControl;
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struct
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{
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FSP_FSCTL_TRANSACT_BUF SecurityDescriptor;
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} QuerySecurity;
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@ -54,6 +54,35 @@ typedef NTSTATUS FSP_FILE_SYSTEM_OPERATION_GUARD(FSP_FILE_SYSTEM *,
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FSP_FSCTL_TRANSACT_REQ *, FSP_FSCTL_TRANSACT_RSP *);
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typedef NTSTATUS FSP_FILE_SYSTEM_OPERATION(FSP_FILE_SYSTEM *,
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FSP_FSCTL_TRANSACT_REQ *, FSP_FSCTL_TRANSACT_RSP *);
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/**
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* User mode file system locking strategy.
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*
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* Two concurrency models are provided:
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*
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* 1. A fine-grained concurrency model where file system NAMESPACE accesses
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* are guarded using an exclusive-shared (read-write) lock. File I/O is not
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* guarded and concurrent reads/writes/etc. are possible. [Note that the FSD
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* will still apply an exclusive-shared lock PER INDIVIDUAL FILE, but it will
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* not limit I/O operations for different files.]
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*
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* The fine-grained concurrency model applies the exclusive-shared lock as
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* follows:
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* <ul>
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* <li>EXCL: SetVolumeLabel, Create, Cleanup(Delete), SetInformation(Rename)</li>
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* <li>SHRD: GetVolumeInfo, Open, SetInformation(Disposition), ReadDirectory</li>
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* <li>NONE: all other operations</li>
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* </ul>
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*
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* 2. A coarse-grained concurrency model where all file system accesses are
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* guarded by a mutually exclusive lock.
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*
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* @see FspFileSystemSetOperationGuardStrategy
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*/
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typedef enum
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{
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FSP_FILE_SYSTEM_OPERATION_GUARD_STRATEGY_FINE = 0,
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FSP_FILE_SYSTEM_OPERATION_GUARD_STRATEGY_COARSE,
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} FSP_FILE_SYSTEM_OPERATION_GUARD_STRATEGY;
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/**
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* @class FSP_FILE_SYSTEM
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* File system interface.
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@ -74,7 +103,7 @@ typedef struct _FSP_FILE_SYSTEM_INTERFACE
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* Pointer to a structure that will receive the volume information on successful return
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* from this call.
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* @return
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* STATUS_SUCCESS on error code.
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* STATUS_SUCCESS or error code.
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*/
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NTSTATUS (*GetVolumeInfo)(FSP_FILE_SYSTEM *FileSystem,
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FSP_FSCTL_TRANSACT_REQ *Request,
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@ -92,7 +121,7 @@ typedef struct _FSP_FILE_SYSTEM_INTERFACE
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* Pointer to a structure that will receive the volume information on successful return
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* from this call.
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* @return
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* STATUS_SUCCESS on error code.
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* STATUS_SUCCESS or error code.
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*/
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NTSTATUS (*SetVolumeLabel)(FSP_FILE_SYSTEM *FileSystem,
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FSP_FSCTL_TRANSACT_REQ *Request,
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@ -116,7 +145,11 @@ typedef struct _FSP_FILE_SYSTEM_INTERFACE
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* security descriptor buffer. On output it will contain the actual size of the security
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* descriptor copied into the security descriptor buffer. May be NULL.
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* @return
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* STATUS_SUCCESS on error code.
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* STATUS_SUCCESS, STATUS_REPARSE or error code.
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*
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* STATUS_REPARSE should be returned by file systems that support reparse points when
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* they encounter a FileName that contains reparse points anywhere but the final path
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* component.
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*/
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NTSTATUS (*GetSecurityByName)(FSP_FILE_SYSTEM *FileSystem,
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PWSTR FileName, PUINT32 PFileAttributes,
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@ -158,7 +191,7 @@ typedef struct _FSP_FILE_SYSTEM_INTERFACE
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* Pointer to a structure that will receive the file information on successful return
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* from this call. This information includes file attributes, file times, etc.
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* @return
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* STATUS_SUCCESS on error code.
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* STATUS_SUCCESS or error code.
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*/
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NTSTATUS (*Create)(FSP_FILE_SYSTEM *FileSystem,
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FSP_FSCTL_TRANSACT_REQ *Request,
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@ -193,7 +226,7 @@ typedef struct _FSP_FILE_SYSTEM_INTERFACE
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* Pointer to a structure that will receive the file information on successful return
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* from this call. This information includes file attributes, file times, etc.
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* @return
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* STATUS_SUCCESS on error code.
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* STATUS_SUCCESS or error code.
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*/
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NTSTATUS (*Open)(FSP_FILE_SYSTEM *FileSystem,
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FSP_FSCTL_TRANSACT_REQ *Request,
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@ -217,7 +250,7 @@ typedef struct _FSP_FILE_SYSTEM_INTERFACE
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* Pointer to a structure that will receive the file information on successful return
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* from this call. This information includes file attributes, file times, etc.
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* @return
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* STATUS_SUCCESS on error code.
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* STATUS_SUCCESS or error code.
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*/
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NTSTATUS (*Overwrite)(FSP_FILE_SYSTEM *FileSystem,
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FSP_FSCTL_TRANSACT_REQ *Request,
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@ -292,7 +325,7 @@ typedef struct _FSP_FILE_SYSTEM_INTERFACE
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* @param PBytesTransferred [out]
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* Pointer to a memory location that will receive the actual number of bytes read.
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* @return
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* STATUS_SUCCESS on error code. STATUS_PENDING is supported allowing for asynchronous
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* STATUS_SUCCESS or error code. STATUS_PENDING is supported allowing for asynchronous
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* operation.
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*/
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NTSTATUS (*Read)(FSP_FILE_SYSTEM *FileSystem,
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@ -325,7 +358,7 @@ typedef struct _FSP_FILE_SYSTEM_INTERFACE
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* Pointer to a structure that will receive the file information on successful return
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* from this call. This information includes file attributes, file times, etc.
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* @return
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* STATUS_SUCCESS on error code. STATUS_PENDING is supported allowing for asynchronous
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* STATUS_SUCCESS or error code. STATUS_PENDING is supported allowing for asynchronous
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* operation.
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*/
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NTSTATUS (*Write)(FSP_FILE_SYSTEM *FileSystem,
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@ -345,7 +378,7 @@ typedef struct _FSP_FILE_SYSTEM_INTERFACE
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* @param FileNode
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* The file node of the file to be flushed. When NULL the whole volume is being flushed.
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* @return
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* STATUS_SUCCESS on error code.
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* STATUS_SUCCESS or error code.
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*/
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NTSTATUS (*Flush)(FSP_FILE_SYSTEM *FileSystem,
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FSP_FSCTL_TRANSACT_REQ *Request,
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@ -363,7 +396,7 @@ typedef struct _FSP_FILE_SYSTEM_INTERFACE
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* Pointer to a structure that will receive the file information on successful return
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* from this call. This information includes file attributes, file times, etc.
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* @return
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* STATUS_SUCCESS on error code.
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* STATUS_SUCCESS or error code.
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*/
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NTSTATUS (*GetFileInfo)(FSP_FILE_SYSTEM *FileSystem,
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FSP_FSCTL_TRANSACT_REQ *Request,
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@ -394,7 +427,7 @@ typedef struct _FSP_FILE_SYSTEM_INTERFACE
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* Pointer to a structure that will receive the file information on successful return
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* from this call. This information includes file attributes, file times, etc.
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* @return
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* STATUS_SUCCESS on error code.
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* STATUS_SUCCESS or error code.
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*/
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NTSTATUS (*SetBasicInfo)(FSP_FILE_SYSTEM *FileSystem,
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FSP_FSCTL_TRANSACT_REQ *Request,
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@ -435,7 +468,7 @@ typedef struct _FSP_FILE_SYSTEM_INTERFACE
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* Pointer to a structure that will receive the file information on successful return
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* from this call. This information includes file attributes, file times, etc.
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* @return
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* STATUS_SUCCESS on error code.
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* STATUS_SUCCESS or error code.
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*/
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NTSTATUS (*SetFileSize)(FSP_FILE_SYSTEM *FileSystem,
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FSP_FSCTL_TRANSACT_REQ *Request,
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@ -463,7 +496,7 @@ typedef struct _FSP_FILE_SYSTEM_INTERFACE
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* @param FileName
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* The name of the file or directory to test for deletion.
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* @return
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* STATUS_SUCCESS on error code.
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* STATUS_SUCCESS or error code.
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* @see
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* Cleanup
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*/
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@ -495,7 +528,7 @@ typedef struct _FSP_FILE_SYSTEM_INTERFACE
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* @param ReplaceIfExists
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* Whether to replace a file that already exists at NewFileName.
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* @return
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* STATUS_SUCCESS on error code.
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* STATUS_SUCCESS or error code.
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*/
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NTSTATUS (*Rename)(FSP_FILE_SYSTEM *FileSystem,
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FSP_FSCTL_TRANSACT_REQ *Request,
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@ -516,7 +549,7 @@ typedef struct _FSP_FILE_SYSTEM_INTERFACE
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* security descriptor buffer. On output it will contain the actual size of the security
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* descriptor copied into the security descriptor buffer. Cannot be NULL.
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* @return
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* STATUS_SUCCESS on error code.
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* STATUS_SUCCESS or error code.
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*/
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NTSTATUS (*GetSecurity)(FSP_FILE_SYSTEM *FileSystem,
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FSP_FSCTL_TRANSACT_REQ *Request,
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@ -535,7 +568,7 @@ typedef struct _FSP_FILE_SYSTEM_INTERFACE
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* Security descriptor to apply to the file or directory. This security descriptor will
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* always be in self-relative format.
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* @return
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* STATUS_SUCCESS on error code.
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* STATUS_SUCCESS or error code.
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*/
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NTSTATUS (*SetSecurity)(FSP_FILE_SYSTEM *FileSystem,
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FSP_FSCTL_TRANSACT_REQ *Request,
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@ -566,7 +599,7 @@ typedef struct _FSP_FILE_SYSTEM_INTERFACE
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* @param PBytesTransferred [out]
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* Pointer to a memory location that will receive the actual number of bytes read.
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* @return
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* STATUS_SUCCESS on error code. STATUS_PENDING is supported allowing for asynchronous
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* STATUS_SUCCESS or error code. STATUS_PENDING is supported allowing for asynchronous
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* operation.
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* @see
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* FspFileSystemAddDirInfo
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@ -576,12 +609,123 @@ typedef struct _FSP_FILE_SYSTEM_INTERFACE
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PVOID FileNode, PVOID Buffer, UINT64 Offset, ULONG Length,
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PWSTR Pattern,
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PULONG PBytesTransferred);
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/**
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* Resolve reparse points.
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*
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* A file or directory can contain a reparse point. A reparse point is data that has
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* special meaning to the file system, Windows or user applications. For example, NTFS
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* and Windows use reparse points to implement symbolic links. As another example,
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* a particular file system may use reparse points to emulate UNIX FIFO's.
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*
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* Reparse points are a general mechanism for attaching special behavior to files. WinFsp
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* supports any kind of reparse point. The symbolic link reparse point however is so
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* important for many file systems (especially POSIX ones) that WinFsp implements special
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* support for it.
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*
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* This function is expected to resolve as many reparse points as possible. If a reparse
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* point is encountered that is not understood by the file system further reparse point
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* resolution should stop; the reparse point data should be returned to the FSD with status
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* STATUS_REPARSE/reparse-tag. If a reparse point (symbolic link) is encountered that is
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* understood by the file system but points outside it, the reparse point should be
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* resolved, but further reparse point resolution should stop; the resolved file name
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* should be returned to the FSD with status STATUS_REPARSE/IO_REPARSE.
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*
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* @param FileSystem
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* The file system on which this request is posted.
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* @param FileName
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* The name of the file or directory to have its reparse points resolved.
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* @param OpenReparsePoint
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* If TRUE, the last path component of FileName should not be resolved, even
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* if it is a reparse point that can be resolved. If FALSE, all path components
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* should be resolved if possible.
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* @param PIoStatus
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* Pointer to storage that will receive the status to return to the FSD. When
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* this function succeeds it must set PIoStatus->Status to STATUS_REPARSE and
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* PIoStatus->Information to either IO_REPARSE or the reparse tag.
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* @param Buffer
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* Pointer to a buffer that will receive the resolved file name (IO_REPARSE) or
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* reparse data (reparse tag). If the function returns a file name, it should
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* not be NULL terminated.
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* @param PSize [in,out]
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* Pointer to the buffer size. On input it contains the size of the buffer.
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* On output it will contain the actual size of data copied.
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* @return
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* STATUS_REPARSE or error code.
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*/
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NTSTATUS (*ResolveReparsePoints)(FSP_FILE_SYSTEM *FileSystem,
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PWSTR FileName, BOOLEAN OpenReparsePoint,
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PIO_STATUS_BLOCK PIoStatus, PVOID Buffer, PSIZE_T PSize);
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/**
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* Get reparse point.
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*
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* The behavior of this function depends on the value of FSP_FSCTL_VOLUME_PARAMS ::
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* SymbolicLinksOnly. If the value of SymbolicLinksOnly is FALSE the file system
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* supports full reparse points and this function is expected to fill the buffer
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* with a full reparse point. If the value of SymbolicLinksOnly is TRUE the file
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* system supports symbolic links only as reparse points and this function is
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* expected to fill the buffer with the symbolic link path.
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*
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* @param FileSystem
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* The file system on which this request is posted.
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* @param Request
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* The request posted by the kernel mode FSD.
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* @param FileNode
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* The file node of the reparse point.
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* @param FileName
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* The file name of the reparse point.
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* @param Buffer
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* Pointer to a buffer that will receive the results of this operation. If
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* the function returns a symbolic link path, it should not be NULL terminated.
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* @param PSize [in,out]
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* Pointer to the buffer size. On input it contains the size of the buffer.
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* On output it will contain the actual size of data copied.
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* @return
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* STATUS_SUCCESS or error code.
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* @see
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* SetReparsePoint
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*/
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NTSTATUS (*GetReparsePoint)(FSP_FILE_SYSTEM *FileSystem,
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FSP_FSCTL_TRANSACT_REQ *Request,
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PVOID FileNode,
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PWSTR FileName, PVOID Buffer, PSIZE_T PSize);
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/**
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* Set reparse point.
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*
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* The behavior of this function depends on the value of FSP_FSCTL_VOLUME_PARAMS ::
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* SymbolicLinksOnly. If the value of SymbolicLinksOnly is FALSE the file system
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* supports full reparse points and this function is expected to set the reparse point
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* contained in the buffer. If the value of SymbolicLinksOnly is TRUE the file
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* system supports symbolic links only as reparse points and this function is
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* expected to set the symbolic link path contained in the buffer.
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*
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* @param FileSystem
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* The file system on which this request is posted.
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* @param Request
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* The request posted by the kernel mode FSD.
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* @param FileNode
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* The file node of the reparse point.
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* @param FileName
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* The file name of the reparse point.
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* @param Buffer
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* Pointer to a buffer that contains the data for this operation. If this buffer
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* contains a symbolic link path, it should not be assumed to be NULL terminated.
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||||
* @param Size
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* Size of data to write.
|
||||
* @return
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* STATUS_SUCCESS or error code.
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* @see
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* GetReparsePoint
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*/
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NTSTATUS (*SetReparsePoint)(FSP_FILE_SYSTEM *FileSystem,
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FSP_FSCTL_TRANSACT_REQ *Request,
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PVOID FileNode,
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PWSTR FileName, PVOID Buffer, SIZE_T Size);
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||||
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||||
/*
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* This ensures that this interface will always contain 64 function pointers.
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* Please update when changing the interface as it is important for future compatibility.
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||||
*/
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NTSTATUS (*Reserved[45])();
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NTSTATUS (*Reserved[42])();
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} FSP_FILE_SYSTEM_INTERFACE;
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#if defined(WINFSP_DLL_INTERNAL)
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/*
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@ -591,11 +735,6 @@ typedef struct _FSP_FILE_SYSTEM_INTERFACE
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static_assert(sizeof(FSP_FILE_SYSTEM_INTERFACE) == 64 * sizeof(NTSTATUS (*)()),
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"FSP_FILE_SYSTEM_INTERFACE must have 64 entries.");
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||||
#endif
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typedef enum
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||||
{
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||||
FSP_FILE_SYSTEM_OPERATION_GUARD_STRATEGY_FINE = 0,
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FSP_FILE_SYSTEM_OPERATION_GUARD_STRATEGY_COARSE,
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} FSP_FILE_SYSTEM_OPERATION_GUARD_STRATEGY;
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||||
typedef struct _FSP_FILE_SYSTEM
|
||||
{
|
||||
UINT16 Version;
|
||||
@ -628,7 +767,7 @@ typedef struct _FSP_FILE_SYSTEM
|
||||
* Pointer that will receive the file system object created on successful return from this
|
||||
* call.
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||||
* @return
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||||
* STATUS_SUCCESS on error code.
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||||
* STATUS_SUCCESS or error code.
|
||||
*/
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||||
FSP_API NTSTATUS FspFileSystemCreate(PWSTR DevicePath,
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const FSP_FSCTL_VOLUME_PARAMS *VolumeParams,
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@ -654,7 +793,7 @@ FSP_API VOID FspFileSystemDelete(FSP_FILE_SYSTEM *FileSystem);
|
||||
* The mount point for the new file system. A value of NULL means that the file system should
|
||||
* use the next available drive letter counting downwards from Z: as its mount point.
|
||||
* @return
|
||||
* STATUS_SUCCESS on error code.
|
||||
* STATUS_SUCCESS or error code.
|
||||
*/
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||||
FSP_API NTSTATUS FspFileSystemSetMountPoint(FSP_FILE_SYSTEM *FileSystem, PWSTR MountPoint);
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||||
/**
|
||||
@ -677,7 +816,7 @@ FSP_API VOID FspFileSystemRemoveMountPoint(FSP_FILE_SYSTEM *FileSystem);
|
||||
* The number of threads for the file system dispatcher. A value of 0 will create a default
|
||||
* number of threads and should be chosen in most cases.
|
||||
* @return
|
||||
* STATUS_SUCCESS on error code.
|
||||
* STATUS_SUCCESS or error code.
|
||||
*/
|
||||
FSP_API NTSTATUS FspFileSystemStartDispatcher(FSP_FILE_SYSTEM *FileSystem, ULONG ThreadCount);
|
||||
/**
|
||||
@ -740,6 +879,16 @@ VOID FspFileSystemSetOperationGuard(FSP_FILE_SYSTEM *FileSystem,
|
||||
FileSystem->EnterOperation = EnterOperation;
|
||||
FileSystem->LeaveOperation = LeaveOperation;
|
||||
}
|
||||
/**
|
||||
* Set file system locking strategy.
|
||||
*
|
||||
* @param FileSystem
|
||||
* The file system object.
|
||||
* @param GuardStrategy
|
||||
* The locking (guard) strategy.
|
||||
* @see
|
||||
* FSP_FILE_SYSTEM_OPERATION_GUARD_STRATEGY
|
||||
*/
|
||||
static inline
|
||||
VOID FspFileSystemSetOperationGuardStrategy(FSP_FILE_SYSTEM *FileSystem,
|
||||
FSP_FILE_SYSTEM_OPERATION_GUARD_STRATEGY GuardStrategy)
|
||||
@ -807,6 +956,8 @@ FSP_API NTSTATUS FspFileSystemOpSetVolumeInformation(FSP_FILE_SYSTEM *FileSystem
|
||||
FSP_FSCTL_TRANSACT_REQ *Request, FSP_FSCTL_TRANSACT_RSP *Response);
|
||||
FSP_API NTSTATUS FspFileSystemOpQueryDirectory(FSP_FILE_SYSTEM *FileSystem,
|
||||
FSP_FSCTL_TRANSACT_REQ *Request, FSP_FSCTL_TRANSACT_RSP *Response);
|
||||
FSP_API NTSTATUS FspFileSystemOpFileSystemControl(FSP_FILE_SYSTEM *FileSystem,
|
||||
FSP_FSCTL_TRANSACT_REQ *Request, FSP_FSCTL_TRANSACT_RSP *Response);
|
||||
FSP_API NTSTATUS FspFileSystemOpQuerySecurity(FSP_FILE_SYSTEM *FileSystem,
|
||||
FSP_FSCTL_TRANSACT_REQ *Request, FSP_FSCTL_TRANSACT_RSP *Response);
|
||||
FSP_API NTSTATUS FspFileSystemOpSetSecurity(FSP_FILE_SYSTEM *FileSystem,
|
||||
@ -973,7 +1124,7 @@ ULONG FspServiceRun(PWSTR ServiceName,
|
||||
* Pointer that will receive the service object created on successful return from this
|
||||
* call.
|
||||
* @return
|
||||
* STATUS_SUCCESS on error code.
|
||||
* STATUS_SUCCESS or error code.
|
||||
*/
|
||||
FSP_API NTSTATUS FspServiceCreate(PWSTR ServiceName,
|
||||
FSP_SERVICE_START *OnStart,
|
||||
@ -1053,7 +1204,7 @@ FSP_API ULONG FspServiceGetExitCode(FSP_SERVICE *Service);
|
||||
* @param Service
|
||||
* The service object.
|
||||
* @return
|
||||
* STATUS_SUCCESS on error code.
|
||||
* STATUS_SUCCESS or error code.
|
||||
*/
|
||||
FSP_API NTSTATUS FspServiceLoop(FSP_SERVICE *Service);
|
||||
/**
|
||||
@ -1066,7 +1217,7 @@ FSP_API NTSTATUS FspServiceLoop(FSP_SERVICE *Service);
|
||||
* @param Service
|
||||
* The service object.
|
||||
* @return
|
||||
* STATUS_SUCCESS on error code.
|
||||
* STATUS_SUCCESS or error code.
|
||||
*/
|
||||
FSP_API VOID FspServiceStop(FSP_SERVICE *Service);
|
||||
/**
|
||||
|
||||
Reference in New Issue
Block a user