linux-ext4 - Re: [PATCH v7 1/9] block: Keyslot Manager for Inline Encryption

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Date:   Fri, 21 Feb 2020 09:31:18 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Satya Tangirala <satyat@...gle.com>
Cc:     linux-block@...r.kernel.org, linux-scsi@...r.kernel.org,
        linux-fscrypt@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net, linux-ext4@...r.kernel.org,
        Barani Muthukumaran <bmuthuku@....qualcomm.com>,
        Kuohong Wang <kuohong.wang@...iatek.com>,
        Kim Boojin <boojin.kim@...sung.com>
Subject: Re: [PATCH v7 1/9] block: Keyslot Manager for Inline Encryption

On Fri, Feb 21, 2020 at 09:04:34AM -0800, Christoph Hellwig wrote:
> Given that blk_ksm_get_slot_for_key returns a signed keyslot that
> can return errors, and the only callers stores it in a signed variable
> I think this function should take a signed slot as well, and the check
> for a non-negative slot should be moved here from the only caller.

Actually looking over the code again I think it might be better to
return only the error code (and that might actually be a blk_status_t),
and then use an argument to return a pointer to the actual struct
keyslot.  That gives us much easier to understand code and better
type safety.