linux-kernel - Re: [PATCH 06/14] fs/ntfs3: rename bitmap_size() -> ntfs3_bitmap

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Message-ID: <ZSQvR+bQ8PS9/CEa@yury-ThinkPad>
Date:   Mon, 9 Oct 2023 09:50:15 -0700
From:   Yury Norov <yury.norov@...il.com>
To:     Alexander Lobakin <aleksander.lobakin@...el.com>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Alexander Potapenko <glider@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        David Ahern <dsahern@...nel.org>,
        Przemek Kitszel <przemyslaw.kitszel@...el.com>,
        Simon Horman <simon.horman@...igine.com>,
        netdev@...r.kernel.org, linux-btrfs@...r.kernel.org,
        dm-devel@...hat.com, ntfs3@...ts.linux.dev,
        linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 06/14] fs/ntfs3: rename bitmap_size() ->
 ntfs3_bitmap_size()

On Mon, Oct 09, 2023 at 05:10:18PM +0200, Alexander Lobakin wrote:
> 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).
> 
> Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@...el.com>
> Signed-off-by: Alexander Lobakin <aleksander.lobakin@...el.com>
> ---
>  fs/ntfs3/bitmap.c  |  4 ++--
>  fs/ntfs3/fsntfs.c  |  2 +-
>  fs/ntfs3/index.c   | 11 ++++++-----
>  fs/ntfs3/ntfs_fs.h |  2 +-
>  fs/ntfs3/super.c   |  2 +-
>  5 files changed, 11 insertions(+), 10 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..93333156aac6 100644
> --- a/fs/ntfs3/ntfs_fs.h
> +++ b/fs/ntfs3/ntfs_fs.h
> @@ -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?

> 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