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Date:   Sat, 2 Jul 2022 13:57:54 -0700
From:   Yury Norov <yury.norov@gmail.com>
To:     Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Cc:     agk@redhat.com, snitzer@kernel.org, dm-devel@redhat.com,
        vneethv@linux.ibm.com, oberpar@linux.ibm.com, hca@linux.ibm.com,
        gor@linux.ibm.com, agordeev@linux.ibm.com,
        borntraeger@linux.ibm.com, svens@linux.ibm.com,
        almaz.alexandrovich@paragon-software.com,
        andriy.shevchenko@linux.intel.com, linux@rasmusvillemoes.dk,
        linux-s390@vger.kernel.org, ntfs3@lists.linux.dev,
        linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org
Subject: Re: [PATCH 2/4] fs/ntfs3: Rename bitmap_size() as ntfs3_bitmap_size()
Message-ID: <YsCxUrTKd1N4aVoJ@yury-laptop>
References: <cover.1656785856.git.christophe.jaillet@wanadoo.fr>
 <56a3cb896ec446ca24e4756042d9f0829afc671a.1656785856.git.christophe.jaillet@wanadoo.fr>
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On Sat, Jul 02, 2022 at 08:29:27PM +0200, Christophe JAILLET wrote:
> In order to introduce a bitmap_size() function in the bitmap API, we have
> to rename functions with a similar name.
> 
> Add a "ntfs3_" prefix and change bitmap_size() into ntfs3_bitmap_size().
> 
> No functional change.
> 
> Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
> ---
>  fs/ntfs3/bitmap.c  | 4 ++--
>  fs/ntfs3/fsntfs.c  | 2 +-
>  fs/ntfs3/index.c   | 6 +++---
>  fs/ntfs3/ntfs_fs.h | 2 +-
>  fs/ntfs3/super.c   | 2 +-
>  5 files changed, 8 insertions(+), 8 deletions(-)
> 
> diff --git a/fs/ntfs3/bitmap.c b/fs/ntfs3/bitmap.c
> index e3b5680fd516..f98327453d83 100644
> --- a/fs/ntfs3/bitmap.c
> +++ b/fs/ntfs3/bitmap.c
> @@ -661,7 +661,7 @@ 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;
> @@ -1323,7 +1323,7 @@ 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 3de5700a9b83..9c74d88ce0f0 100644
> --- a/fs/ntfs3/fsntfs.c
> +++ b/fs/ntfs3/fsntfs.c
> @@ -493,7 +493,7 @@ 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 84ccc1409874..5c5ea05a5ef1 100644
> --- a/fs/ntfs3/index.c
> +++ b/fs/ntfs3/index.c
> @@ -1353,7 +1353,7 @@ 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,
> +	err = ni_insert_resident(ni, ntfs3_bitmap_size(1), ATTR_BITMAP, in->name,
>  				 in->name_len, &bitmap, NULL, NULL);
>  	if (err)
>  		goto out2;
> @@ -1415,7 +1415,7 @@ 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),
> +				    &indx->bitmap_run, ntfs3_bitmap_size(bit + 1),
>  				    NULL, true, NULL);
>  		if (err)
>  			goto out1;
> @@ -1973,7 +1973,7 @@ static int indx_shrink(struct ntfs_index *indx, struct ntfs_inode *ni,
>  	if (err)
>  		return err;
>  
> -	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 55d686e3c4ec..85210e610a3a 100644
> --- a/fs/ntfs3/ntfs_fs.h
> +++ b/fs/ntfs3/ntfs_fs.h
> @@ -945,7 +945,7 @@ 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);
>  }

Here everything looks OK for me. NTFS3 has their own good reasons
to reserve 64-bit words for their bitmaps, and they need their own
functions for this. And the prefix looks OK because it underlines
that this is a local story.

Maybe we can turn it into BITS_TO_LLONGS() and put into 
include/linux/bitops.h... But unless we have another subsystem that
needs it, I'm OK with current approach.

Acked-by: Yury Norov <yury.norov@gmail.com>

> diff --git a/fs/ntfs3/super.c b/fs/ntfs3/super.c
> index b41d7c824a50..7d48f886ac82 100644
> --- a/fs/ntfs3/super.c
> +++ b/fs/ntfs3/super.c
> @@ -1101,7 +1101,7 @@ 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)) {
>  		err = -EINVAL;
>  		goto put_inode_out;
>  	}
> -- 
> 2.34.1