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-rw-r--r--fs/ntfs/layout.h15
1 files changed, 8 insertions, 7 deletions
diff --git a/fs/ntfs/layout.h b/fs/ntfs/layout.h
index 7cb8806d4559..8d1f1326612f 100644
--- a/fs/ntfs/layout.h
+++ b/fs/ntfs/layout.h
@@ -749,10 +749,11 @@ typedef struct {
record header aligned to 8-byte boundary. */
/* 34*/ u8 compression_unit; /* The compression unit expressed
as the log to the base 2 of the number of
- clusters in a compression unit. 0 means not
- compressed. (This effectively limits the
+ clusters in a compression unit. 0 means not
+ compressed. (This effectively limits the
compression unit size to be a power of two
- clusters.) WinNT4 only uses a value of 4. */
+ clusters.) WinNT4 only uses a value of 4.
+ Sparse files also have this set to 4. */
/* 35*/ u8 reserved[5]; /* Align to 8-byte boundary. */
/* The sizes below are only used when lowest_vcn is zero, as otherwise it would
be difficult to keep them up-to-date.*/
@@ -772,10 +773,10 @@ typedef struct {
data_size. */
/* sizeof(uncompressed attr) = 64*/
/* 64*/ sle64 compressed_size; /* Byte size of the attribute
- value after compression. Only present when
- compressed. Always is a multiple of the
- cluster size. Represents the actual amount of
- disk space being used on the disk. */
+ value after compression. Only present when
+ compressed or sparse. Always is a multiple of
+ the cluster size. Represents the actual amount
+ of disk space being used on the disk. */
/* sizeof(compressed attr) = 72*/
} __attribute__ ((__packed__)) non_resident;
} __attribute__ ((__packed__)) data;