linux-kernel - Re: [PATCH 01/17] nilfs2: move page release outside of nilfs_delete_entry and nilfs_set

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Message-ID: <ZWTM/tns2JTd1YrQ@casper.infradead.org>
Date:   Mon, 27 Nov 2023 17:08:14 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     Ryusuke Konishi <konishi.ryusuke@...il.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        linux-nilfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/17] nilfs2: move page release outside of
 nilfs_delete_entry and nilfs_set_link

On Mon, Nov 27, 2023 at 11:30:20PM +0900, Ryusuke Konishi wrote:
> In a few directory operations, the call to nilfs_put_page() for a page
> obtained using nilfs_find_entry() or nilfs_dotdot() is hidden in
> nilfs_set_link() and nilfs_delete_entry(), making it difficult to track
> page release and preventing change of its call position.
> 
> By moving nilfs_put_page() out of these functions, this makes the page
> get/put correspondence clearer and makes it easier to swap
> nilfs_put_page() calls (and kunmap calls within them) when modifying
> multiple directory entries simultaneously in nilfs_rename().
> 
> Also, update comments for nilfs_set_link() and nilfs_delete_entry() to
> reflect changes in their behavior.
> 
> To make nilfs_put_page() visible from namei.c, this moves its definition
> to nilfs.h and replaces existing equivalents to use it, but the exposure
> of that definition is temporary and will be removed on a later
> kmap -> kmap_local conversion.
> 
> Signed-off-by: Ryusuke Konishi <konishi.ryusuke@...il.com>
> Cc: Matthew Wilcox (Oracle) <willy@...radead.org>

Ah; I see.  This makes it more like ext2, so I approve!

Reviewed-by: Matthew Wilcox (Oracle) <willy@...radead.org>