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-rw-r--r--fs/ntfs/layout.h44
1 files changed, 24 insertions, 20 deletions
diff --git a/fs/ntfs/layout.h b/fs/ntfs/layout.h
index bb408d4dcbb..d34b93cb8b4 100644
--- a/fs/ntfs/layout.h
+++ b/fs/ntfs/layout.h
@@ -769,7 +769,7 @@ typedef struct {
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.*/
@@ -801,13 +801,16 @@ typedef struct {
typedef ATTR_RECORD ATTR_REC;
/*
- * File attribute flags (32-bit).
+ * File attribute flags (32-bit) appearing in the file_attributes fields of the
+ * STANDARD_INFORMATION attribute of MFT_RECORDs and the FILENAME_ATTR
+ * attributes of MFT_RECORDs and directory index entries.
+ *
+ * All of the below flags appear in the directory index entries but only some
+ * appear in the STANDARD_INFORMATION attribute whilst only some others appear
+ * in the FILENAME_ATTR attribute of MFT_RECORDs. Unless otherwise stated the
+ * flags appear in all of the above.
*/
enum {
- /*
- * The following flags are only present in the STANDARD_INFORMATION
- * attribute (in the field file_attributes).
- */
FILE_ATTR_READONLY = const_cpu_to_le32(0x00000001),
FILE_ATTR_HIDDEN = const_cpu_to_le32(0x00000002),
FILE_ATTR_SYSTEM = const_cpu_to_le32(0x00000004),
@@ -839,18 +842,14 @@ enum {
F_A_COMPRESSED, and F_A_ENCRYPTED and preserves the rest. This mask
is used to to obtain all flags that are valid for setting. */
/*
- * The following flag is only present in the FILE_NAME attribute (in
- * the field file_attributes).
+ * The flag FILE_ATTR_DUP_FILENAME_INDEX_PRESENT is present in all
+ * FILENAME_ATTR attributes but not in the STANDARD_INFORMATION
+ * attribute of an mft record.
*/
FILE_ATTR_DUP_FILE_NAME_INDEX_PRESENT = const_cpu_to_le32(0x10000000),
/* Note, this is a copy of the corresponding bit from the mft record,
telling us whether this is a directory or not, i.e. whether it has
an index root attribute or not. */
- /*
- * The following flag is present both in the STANDARD_INFORMATION
- * attribute and in the FILE_NAME attribute (in the field
- * file_attributes).
- */
FILE_ATTR_DUP_VIEW_INDEX_PRESENT = const_cpu_to_le32(0x20000000),
/* Note, this is a copy of the corresponding bit from the mft record,
telling us whether this file has a view index present (eg. object id
@@ -891,7 +890,7 @@ typedef struct {
Windows this is only updated when
accessed if some time delta has
passed since the last update. Also,
- last access times updates can be
+ last access time updates can be
disabled altogether for speed. */
/* 32*/ FILE_ATTR_FLAGS file_attributes; /* Flags describing the file. */
/* 36*/ union {
@@ -1076,16 +1075,21 @@ typedef struct {
/* 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 {