NTFS: Add support for sparse files which have a compression unit of 0.
Signed-off-by: Anton Altaparmakov <aia21@cantab.net>
diff --git a/fs/ntfs/layout.h b/fs/ntfs/layout.h
index bb408d4..f4283e1 100644
--- a/fs/ntfs/layout.h
+++ b/fs/ntfs/layout.h
@@ -769,7 +769,7 @@
compressed. (This effectively limits the
compression unit size to be a power of two
clusters.) WinNT4 only uses a value of 4.
- Sparse files also have this set to 4. */
+ Sparse files have this set to 0 on XPSP2. */
/* 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.*/
@@ -1076,16 +1076,21 @@
/* 20*/ sle64 last_access_time; /* Time this mft record was last
accessed. */
/* 28*/ sle64 allocated_size; /* Byte size of on-disk allocated space
- for the data attribute. So for
- normal $DATA, this is the
+ for the unnamed data attribute. So
+ for normal $DATA, this is the
allocated_size from the unnamed
$DATA attribute and for compressed
and/or sparse $DATA, this is the
compressed_size from the unnamed
- $DATA attribute. NOTE: This is a
- multiple of the cluster size. */
-/* 30*/ sle64 data_size; /* Byte size of actual data in data
- attribute. */
+ $DATA attribute. For a directory or
+ other inode without an unnamed $DATA
+ attribute, this is always 0. NOTE:
+ This is a multiple of the cluster
+ size. */
+/* 30*/ sle64 data_size; /* Byte size of actual data in unnamed
+ data attribute. For a directory or
+ other inode without an unnamed $DATA
+ attribute, this is always 0. */
/* 38*/ FILE_ATTR_FLAGS file_attributes; /* Flags describing the file. */
/* 3c*/ union {
/* 3c*/ struct {
