NTFS: Add support for sparse files which have a compression unit of 0.

[powerpc.git] / fs / ntfs / attrib.c

diff --git a/fs/ntfs/attrib.c b/fs/ntfs/attrib.c
index a92b9e9..7a568eb 100644 (file)
--- a/fs/ntfs/attrib.c
+++ b/fs/ntfs/attrib.c
@@ -1695,7 +1695,9 @@ int ntfs_attr_make_non_resident(ntfs_inode *ni, const u32 data_size)
                        a->data.non_resident.initialized_size =
                        cpu_to_sle64(attr_size);
        if (NInoSparse(ni) || NInoCompressed(ni)) {
-               a->data.non_resident.compression_unit = 4;
+               a->data.non_resident.compression_unit = 0;
+               if (NInoCompressed(ni) || vol->major_ver < 3)
+                       a->data.non_resident.compression_unit = 4;
                a->data.non_resident.compressed_size =
                                a->data.non_resident.allocated_size;
        } else
@@ -1714,13 +1716,20 @@ int ntfs_attr_make_non_resident(ntfs_inode *ni, const u32 data_size)
        ni->allocated_size = new_size;
        if (NInoSparse(ni) || NInoCompressed(ni)) {
                ni->itype.compressed.size = ni->allocated_size;
-               ni->itype.compressed.block_size = 1U <<
-                               (a->data.non_resident.compression_unit +
-                               vol->cluster_size_bits);
-               ni->itype.compressed.block_size_bits =
-                               ffs(ni->itype.compressed.block_size) - 1;
-               ni->itype.compressed.block_clusters = 1U <<
-                               a->data.non_resident.compression_unit;
+               if (a->data.non_resident.compression_unit) {
+                       ni->itype.compressed.block_size = 1U << (a->data.
+                                       non_resident.compression_unit +
+                                       vol->cluster_size_bits);
+                       ni->itype.compressed.block_size_bits =
+                                       ffs(ni->itype.compressed.block_size) -
+                                       1;
+                       ni->itype.compressed.block_clusters = 1U <<
+                                       a->data.non_resident.compression_unit;
+               } else {
+                       ni->itype.compressed.block_size = 0;
+                       ni->itype.compressed.block_size_bits = 0;
+                       ni->itype.compressed.block_clusters = 0;
+               }
                vi->i_blocks = ni->itype.compressed.size >> 9;
        } else
                vi->i_blocks = ni->allocated_size >> 9;