[PATCH v2 06/13] fs/ntfs3: add prefix to bitmap_size() and use BITS_TO_U64()

[Alexander Lobakin <aleksander.lobakin@intel.com>]

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>
Signed-off-by: Alexander Lobakin <aleksander.lobakin@intel.com>
---
 fs/ntfs3/bitmap.c  |  4 ++--
 fs/ntfs3/fsntfs.c  |  2 +-
 fs/ntfs3/index.c   | 11 ++++++-----
 fs/ntfs3/ntfs_fs.h |  4 ++--
 fs/ntfs3/super.c   |  2 +-
 5 files changed, 12 insertions(+), 11 deletions(-)

diff --git a/fs/ntfs3/bitmap.c b/fs/ntfs3/bitmap.c
index 107e808e06ea..a2e18f13e93a 100644
--- a/fs/ntfs3/bitmap.c
+++ b/fs/ntfs3/bitmap.c
@@ -653,7 +653,7 @@ 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;
@@ -1345,7 +1345,7 @@ 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;
diff --git a/fs/ntfs3/fsntfs.c b/fs/ntfs3/fsntfs.c
index 33afee0f5559..7a14d2347f27 100644
--- a/fs/ntfs3/fsntfs.c
+++ b/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);
diff --git a/fs/ntfs3/index.c b/fs/ntfs3/index.c
index 124c6e822623..ab53a4b6ddf8 100644
--- a/fs/ntfs3/index.c
+++ b/fs/ntfs3/index.c
@@ -1453,8 +1453,8 @@ 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;
 
@@ -1515,8 +1515,9 @@ 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;
 	}
@@ -2089,7 +2090,7 @@ static int indx_shrink(struct ntfs_index *indx, struct ntfs_inode *ni,
 	if (in->name == I30_NAME)
 		ni->vfs_inode.i_size = new_data;
 
-	bpb = bitmap_size(bit);
+	bpb = ntfs3_bitmap_size(bit);
 	if (bpb * 8 == nbits)
 		return 0;
 
diff --git a/fs/ntfs3/ntfs_fs.h b/fs/ntfs3/ntfs_fs.h
index 629403ede6e5..b632305d2530 100644
--- a/fs/ntfs3/ntfs_fs.h
+++ b/fs/ntfs3/ntfs_fs.h
@@ -961,9 +961,9 @@ 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
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