From: Yury Norov <yury.norov@gmail.com>
Date: Mon, 9 Oct 2023 09:50:15 -0700

On Mon, Oct 09, 2023 at 05:10:18PM +0200, Alexander Lobakin wrote:

quoted

bitmap_size() is a pretty generic name and one may want to use it for

[...]

quoted

@@ -961,7 +961,7 @@ 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);
 }

This looks like duplicating BITS_TO_U64(). If so, why not just switch
to using the macro while you're here?

I thought that this

	return BITS_TO_U64(bits) * sizeof(u64);

would give worse optimization, but actually

add/remove: 0/0 grow/shrink: 0/6 up/down: 0/-32 (-32)

Nice, makes sense to do it.

quoted

diff --git a/fs/ntfs3/super.c b/fs/ntfs3/super.c
index cfec5e0c7f66..b1fb6efe7084 100644
--- a/fs/ntfs3/super.c
+++ b/fs/ntfs3/super.c

@@ -1285,7 +1285,7 @@ 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;

-- 
2.41.0

Thanks,
Olek