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From: "Theodore Y. Ts'o" <tytso@mit.edu>
To: Eric Biggers <ebiggers@kernel.org>
Cc: linux-fscrypt@vger.kernel.org, linux-ext4@vger.kernel.org,
	linux-f2fs-devel@lists.sourceforge.net
Subject: Re: [PATCH] fs-verity: use mempool for hash requests
Date: Mon, 13 Jan 2020 19:28:44 -0500
Message-ID: <20200114002844.GA116395@mit.edu> (raw)
In-Reply-To: <20191231175545.20709-1-ebiggers@kernel.org>

On Tue, Dec 31, 2019 at 11:55:45AM -0600, Eric Biggers wrote:
> From: Eric Biggers <ebiggers@google.com>
> 
> When initializing an fs-verity hash algorithm, also initialize a mempool
> that contains a single preallocated hash request object.  Then replace
> the direct calls to ahash_request_alloc() and ahash_request_free() with
> allocating and freeing from this mempool.
> 
> This eliminates the possibility of the allocation failing, which is
> desirable for the I/O path.
> 
> This doesn't cause deadlocks because there's no case where multiple hash
> requests are needed at a time to make forward progress.
> 
> Signed-off-by: Eric Biggers <ebiggers@google.com>

Looks good; feel free to add:

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


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Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-31 17:55 Eric Biggers
2020-01-14  0:28 ` Theodore Y. Ts'o [this message]
2020-01-14 21:32 ` Eric Biggers

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