fs/ntfs3: add prefix to bitmap_size() and use BITS_TO_U64()

bitmap_size() is a pretty generic name and one may want to use it for
a generic bitmap API function. At the same time, its logic is
NTFS-specific, as it aligns to the sizeof(u64), not the sizeof(long)
(although it uses ideologically right ALIGN() instead of division).
Add the prefix 'ntfs3_' used for that FS (not just 'ntfs_' to not mix
it with the legacy module) and use generic BITS_TO_U64() while at it.

Suggested-by: Yury Norov <yury.norov@gmail.com> # BITS_TO_U64()
Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
Reviewed-by: Yury Norov <yury.norov@gmail.com>
Signed-off-by: Alexander Lobakin <aleksander.lobakin@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

fs/ntfs3/bitmap.c

@@ -654,7 +654,7 @@ int wnd_init(struct wnd_bitmap *wnd, struct super_block *sb, size_t nbits)
 	wnd->total_zeroes = nbits;
 	wnd->extent_max = MINUS_ONE_T;
 	wnd->zone_bit = wnd->zone_end = 0;
-	wnd->nwnd = bytes_to_block(sb, bitmap_size(nbits));
+	wnd->nwnd = bytes_to_block(sb, ntfs3_bitmap_size(nbits));
 	wnd->bits_last = nbits & (wbits - 1);
 	if (!wnd->bits_last)
 		wnd->bits_last = wbits;
@@ -1347,7 +1347,7 @@ int wnd_extend(struct wnd_bitmap *wnd, size_t new_bits)
 		return -EINVAL;
 
 	/* Align to 8 byte boundary. */
-	new_wnd = bytes_to_block(sb, bitmap_size(new_bits));
+	new_wnd = bytes_to_block(sb, ntfs3_bitmap_size(new_bits));
 	new_last = new_bits & (wbits - 1);
 	if (!new_last)
 		new_last = wbits;

fs/ntfs3/fsntfs.c

@@ -522,7 +522,7 @@ static int ntfs_extend_mft(struct ntfs_sb_info *sbi)
 	ni->mi.dirty = true;
 
 	/* Step 2: Resize $MFT::BITMAP. */
-	new_bitmap_bytes = bitmap_size(new_mft_total);
+	new_bitmap_bytes = ntfs3_bitmap_size(new_mft_total);
 
 	err = attr_set_size(ni, ATTR_BITMAP, NULL, 0, &sbi->mft.bitmap.run,
 			    new_bitmap_bytes, &new_bitmap_bytes, true, NULL);

fs/ntfs3/index.c

@@ -1456,8 +1456,8 @@ static int indx_create_allocate(struct ntfs_index *indx, struct ntfs_inode *ni,
 
 	alloc->nres.valid_size = alloc->nres.data_size = cpu_to_le64(data_size);
 
-	err = ni_insert_resident(ni, bitmap_size(1), ATTR_BITMAP, in->name,
-				 in->name_len, &bitmap, NULL, NULL);
+	err = ni_insert_resident(ni, ntfs3_bitmap_size(1), ATTR_BITMAP,
+				 in->name, in->name_len, &bitmap, NULL, NULL);
 	if (err)
 		goto out2;
 
@@ -1518,8 +1518,9 @@ static int indx_add_allocate(struct ntfs_index *indx, struct ntfs_inode *ni,
 	if (bmp) {
 		/* Increase bitmap. */
 		err = attr_set_size(ni, ATTR_BITMAP, in->name, in->name_len,
-				    &indx->bitmap_run, bitmap_size(bit + 1),
-				    NULL, true, NULL);
+				    &indx->bitmap_run,
+				    ntfs3_bitmap_size(bit + 1), NULL, true,
+				    NULL);
 		if (err)
 			goto out1;
 	}
@@ -2092,7 +2093,7 @@ static int indx_shrink(struct ntfs_index *indx, struct ntfs_inode *ni,
 	if (in->name == I30_NAME)
 		i_size_write(&ni->vfs_inode, new_data);
 
-	bpb = bitmap_size(bit);
+	bpb = ntfs3_bitmap_size(bit);
 	if (bpb * 8 == nbits)
 		return 0;
 

fs/ntfs3/ntfs_fs.h

@@ -966,9 +966,9 @@ static inline bool run_is_empty(struct runs_tree *run)
 }
 
 /* NTFS uses quad aligned bitmaps. */
-static inline size_t bitmap_size(size_t bits)
+static inline size_t ntfs3_bitmap_size(size_t bits)
 {
-	return ALIGN((bits + 7) >> 3, 8);
+	return BITS_TO_U64(bits) * sizeof(u64);
 }
 
 #define _100ns2seconds 10000000

fs/ntfs3/super.c

@@ -1341,7 +1341,7 @@ static int ntfs_fill_super(struct super_block *sb, struct fs_context *fc)
 
 	/* Check bitmap boundary. */
 	tt = sbi->used.bitmap.nbits;
-	if (inode->i_size < bitmap_size(tt)) {
+	if (inode->i_size < ntfs3_bitmap_size(tt)) {
 		ntfs_err(sb, "$Bitmap is corrupted.");
 		err = -EINVAL;
 		goto put_inode_out;