2.2.16 IFILE_SYSTEM_INFO

Article
10/30/2020

The IFILE_SYSTEM_INFO structure provides information about an installed file system. For more information, see [MSDN-STC].

 struct ifilesysteminfo {
   long fsType;
   WCHAR fsName[MAX_FS_NAME_SIZE];
   unsigned long fsFlags;
   unsigned long fsCompressionFlags;
   int cchLabelLimit;
   int cchLabel;
   [size_is(cchLabel)] wchar_t* iLabelChSet;
 };
 typedef struct ifilesysteminfo IFILE_SYSTEM_INFO;

fsType: Type of the file system. This field contains one of the following values.

Value	Meaning
FSTYPE_UNKNOWN 0x00000000	File system type is unknown.
FSTYPE_NTFS 0x00000001	File system type is NTFS.
FSTYPE_FAT 0x00000002	File system type is FAT.
FSTYPE_FAT32 0x00000003	File system type is FAT32 file system.
FSTYPE_CDFS 0x00000004	File system type is CDFS.
FSTYPE_UDF 0x00000005	File system type is UDF.
FSTYPE_OTHER 0x80000000	File system type is not listed.

fsName: Null-terminated Unicode file system name.

fsFlags: Bitmap of file system flags. The value of this field is a logical OR of zero or more of the applicable flags.

Value	Meaning
FSF_FMT_OPTION_COMPRESS 0x00000001	File system supports compression.
FSF_FMT_OPTION_LABEL 0x00000002	File system supports label specification.
FSF_MNT_POINT_SUPPORT 0x00000004	File system supports creation of mount points.
FSF_REMOVABLE_MEDIA_SUPPORT 0x00000008	File system supports creation of removable media.
FSF_FS_GROW_SUPPORT 0x00000010	File system supports the extend operation.
FSF_FS_QUICK_FORMAT_ENABLE 0x00000020	File system supports quick formatting.
FSF_FS_ALLOC_SZ_512 0x00000040	File system supports an allocation unit size of 512 bytes.
FSF_FS_ALLOC_SZ_1K 0x00000080	File system supports an allocation unit size of 1 kilobyte.
FSF_FS_ALLOC_SZ_2K 0x00000100	File system supports an allocation unit size of 2 kilobytes.
FSF_FS_ALLOC_SZ_4K 0x00000200	File system supports an allocation unit size of 4 kilobytes.
FSF_FS_ALLOC_SZ_8K 0x00000400	File system supports an allocation unit size of 8 kilobytes.
FSF_FS_ALLOC_SZ_16K 0x00000800	File system supports an allocation unit size of 16 kilobytes.
FSF_FS_ALLOC_SZ_32K 0x00001000	File system supports an allocation unit size of 32 kilobytes.
FSF_FS_ALLOC_SZ_64K 0x00002000	File system supports an allocation unit size of 64 kilobytes.
FSF_FS_ALLOC_SZ_128K 0x00004000	File system supports an allocation unit size of 128 kilobytes.
FSF_FS_ALLOC_SZ_256K 0x00008000	File system supports an allocation unit size of 256 kilobytes.
FSF_FS_ALLOC_SZ_OTHER 0x00010000	File system supports any allocation unit size that the user provides.
FSF_FS_FORMAT_SUPPORTED 0x00020000	File system supports formatting.
FSF_FS_VALID_BITS 0x0003FFFF	All other bits in the bitmap MUST be ignored. The server does a bitwise AND operation with this value to clear upper-level bits that may be present but are not supported.

fsCompressionFlags: Bitmap of allocation unit sizes that are valid for compression. The value of this field is a logical 'OR' of zero or more of the applicable flags.

Value	Meaning
FSF_FS_ALLOC_SZ_1K 0x00000080	File system supports an allocation unit size of 1 kilobyte.
FSF_FS_ALLOC_SZ_2K 0x00000100	File system supports an allocation unit size of 2 kilobytes.
FSF_FS_ALLOC_SZ_4K 0x00000200	File system supports an allocation unit size of 4 kilobytes.
FSF_FS_ALLOC_SZ_8K 0x00000400	File system supports an allocation unit size of 8 kilobytes.
FSF_FS_ALLOC_SZ_16K 0x00000800	File system supports an allocation unit size of 16 kilobytes.
FSF_FS_ALLOC_SZ_32K 0x00001000	File system supports an allocation unit size of 32 kilobytes.
FSF_FS_ALLOC_SZ_64K 0x00002000	File system supports an allocation unit size of 64 kilobytes.
FSF_FS_ALLOC_SZ_128K 0x00004000	File system supports an allocation unit size of 128 kilobytes.
FSF_FS_ALLOC_SZ_256K 0x00008000	File system supports an allocation unit size of 256 kilobytes.
FSF_FS_ALLOC_SZ_OTHER 0x00010000	File system supports any allocation unit size that the user provides.

cchLabelLimit: Maximum number of characters allowed in the file system's label.

cchLabel: Length of the iLabelChSet member in bytes.

iLabelChSet: Array of characters that are not allowed in the file system's label.

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2.2.16 IFILE_SYSTEM_INFO

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