linux-ext4 - Re: [PATCH 25/31] ext4: Convert ext4_block_write

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Date:   Mon, 6 Mar 2023 08:27:12 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     Ritesh Harjani <ritesh.list@...il.com>
Cc:     Theodore Tso <tytso@....edu>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 25/31] ext4: Convert ext4_block_write_begin() to take a
 folio

On Mon, Mar 06, 2023 at 12:21:48PM +0530, Ritesh Harjani wrote:
> "Matthew Wilcox (Oracle)" <willy@...radead.org> writes:
> 
> > All the callers now have a folio, so pass that in and operate on folios.
> > Removes four calls to compound_head().
> 
> Why do you say four? Isn't it 3 calls of PageUptodate(page) which
> removes calls to compound_head()? Which one did I miss?
>
> > -	BUG_ON(!PageLocked(page));
> > +	BUG_ON(!folio_test_locked(folio));

That one ;-)

> >  	} else if (fscrypt_inode_uses_fs_layer_crypto(inode)) {
> >  		for (i = 0; i < nr_wait; i++) {
> >  			int err2;
> >
> > -			err2 = fscrypt_decrypt_pagecache_blocks(page, blocksize,
> > -								bh_offset(wait[i]));
> > +			err2 = fscrypt_decrypt_pagecache_blocks(&folio->page,
> > +						blocksize, bh_offset(wait[i]));
> 
> folio_decrypt_pagecache_blocks() takes folio as it's argument now.
> 
> Other than that it looks good to me. Please feel free to add -
> Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@...il.com>

Thanks.  I'll refresh this patchset next week.