2.3.12.1 FILESYSTEM_STATISTICS
The FILESYSTEM_STATISTICS data element is returned with a FSCTL_FILESYSTEM_GET_STATISTICS reply message. It contains the generic information for the message.
The FILESYSTEM_STATISTICS data element is as follows:
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FileSystemType |
Version |
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SizeOfCompleteStructure |
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UserFileReads |
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UserFileReadBytes |
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UserDiskReads |
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UserFileWrites |
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UserFileWriteBytes |
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UserDiskWrites |
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MetaDataReads |
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MetaDataReadBytes |
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MetaDataDiskReads |
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MetaDataWrites |
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MetaDataWriteBytes |
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MetaDataDiskWrites |
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FileSystemType (2 bytes): A 16-bit unsigned integer value containing the type of file system. This field MUST contain one of the following values.
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Value
Meaning
FILESYSTEM_STATISTICS_TYPE_NTFS
0x0001
The file system is an NTFS file system. If this value is set, this structure is followed by an NTFS_STATISTICS structure.
FILESYSTEM_STATISTICS_TYPE_FAT
0x0002
The file system is a FAT file system. If this value is set, this structure is followed by a FAT_STATISTICS structure.
FILESYSTEM_STATISTICS_TYPE_EXFAT
0x0003
The file system is an exFAT file system. If this value is set, this structure is followed by an EXFAT_STATISTICS structure.
FILESYSTEM_STATISTICS_TYPE_REFS
0x0004
The file system is an ReFS file system. If this value is set, this structure is not followed by a structure specific to file system type.
Version (2 bytes): A 16-bit unsigned integer value containing the version. This field MUST be set to the value 0x0001.
SizeOfCompleteStructure (4 bytes): A 32-bit unsigned integer value that indicates the size, in bytes, of this structure plus the size of the file system-specific structure that follows this structure, each rounded up to a multiple of 64, then the sum is multiplied by the number of processors. For example, if the size of FILESYSTEM_STATISTICS is 0x38, the size of NTFS_STATISTICS is 0XD4, and there are two processors, the size of the buffer allocated is 0x280. This is the sum of the sizes of the NTFS_STATISTICS structure and the FILESYSTEM_STATISTICS structure, both rounded up to a multiple of 64 (0x40 + 0x100 = 0x140) and multiplied by the number of processors.
UserFileReads (4 bytes): A 32-bit unsigned integer value containing the number of read operations on user files.
UserFileReadBytes (4 bytes): A 32-bit unsigned integer value containing the number of bytes read from user files.
UserDiskReads (4 bytes): A 32-bit unsigned integer value containing the number of read operations on user files that went to the disk rather than the cache. This value includes sub-read operations.
UserFileWrites (4 bytes): A 32-bit unsigned integer value containing the number of write operations on user files.
UserFileWriteBytes (4 bytes): A 32-bit unsigned integer value containing the number of bytes written to user files.
UserDiskWrites (4 bytes): A 32-bit unsigned integer value containing the number of write operations on user files that went to disk rather than the cache. This value includes sub-write operations.
MetaDataReads (4 bytes): A 32-bit unsigned integer value containing the number of read operations on metadata files.
MetaDataReadBytes (4 bytes): A 32-bit unsigned integer value containing the number of bytes read from metadata files.
MetaDataDiskReads (4 bytes): A 32-bit unsigned integer value containing the number of read operations on metadata files. This value includes sub-read operations.
MetaDataWrites (4 bytes): A 32-bit unsigned integer value containing the number of write operations on metadata files.
MetaDataWriteBytes (4 bytes): A 32-bit unsigned integer value containing the number of bytes written to metadata files.
MetaDataDiskWrites (4 bytes): A 32-bit unsigned integer value containing the number of write operations on metadata files. This value includes sub-write operations.