linux-kernel - Re: [PATCH v2 4/5] ext4: handle IOCB

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Message-ID: <20250625143559.GE28249@mit.edu>
Date: Wed, 25 Jun 2025 10:35:59 -0400
From: "Theodore Ts'o" <tytso@....edu>
To: 陈涛涛 Taotao Chen <chentaotao@...iglobal.com>
Cc: "hch@...radead.org" <hch@...radead.org>,
        "adilger.kernel@...ger.ca" <adilger.kernel@...ger.ca>,
        "willy@...radead.org" <willy@...radead.org>,
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        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
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        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "chentao325@...com" <chentao325@...com>
Subject: Re: [PATCH v2 4/5] ext4: handle IOCB_DONTCACHE in buffered write path

On Tue, Jun 24, 2025 at 12:12:09PM +0000, 陈涛涛 Taotao Chen wrote:
> From: Taotao Chen <chentaotao@...iglobal.com>
> 
> Add support for the IOCB_DONTCACHE flag in ext4_write_begin() and
> ext4_da_write_begin(). When set in the kiocb, the FGP_DONTCACHE bit
> is passed to the page cache lookup, preventing written pages from
> being retained in the cache.
> 
> Only the handling logic is implemented here; the behavior remains
> inactive until ext4 advertises support via FOP_DONTCACHE.
> 
> This change relies on prior patches that refactor the write_begin
> interface to use struct kiocb and introduce DONTCACHE handling in ext4.
> 
> Part of a series refactoring address_space_operations write_begin and
> write_end callbacks to use struct kiocb for passing write context and
> flags.
> 
> Signed-off-by: Taotao Chen <chentaotao@...iglobal.com>

Acked-by: Theodore Ts'o <tytso@....edu>