NTFS: Correct sparse file handling. The compressed values need to be

[mv-sheeva.git] / fs / ntfs / layout.h

diff --git a/fs/ntfs/layout.h b/fs/ntfs/layout.h
index 7cb8806d45599fa4c13647001d7c0a83f54ea962..8d1f1326612fb50e9a7c24b9a37d22a8b8d9f0a9 100644 (file)
--- 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;