From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp-out1.suse.de (smtp-out1.suse.de [195.135.220.28]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 84422156DB for ; Mon, 11 Sep 2023 19:11:08 +0000 (UTC) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out1.suse.de (Postfix) with ESMTPS id A275121863; Mon, 11 Sep 2023 19:11:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1694459466; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=Jd1GXArbDlH//JD9QgDmADD7DMHkLitKJX8xJ6rAvJg=; b=W2cv0Xz9qzM7XTQweMGsyPuzuUGv6tsBtxRA1eHgrynyRUI1CdLxJ5zlQP7nbt3I6psUAD Pv0vLeipRPIc7jLcU7Xd6tu3ncPGFuWN3ug+cRfqdyz0TAuu3ckG4qrWS3lB20qWPX7fnB nPwjJWixepZ1RfIGBfTgwzLMG8f89/0= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1694459466; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=Jd1GXArbDlH//JD9QgDmADD7DMHkLitKJX8xJ6rAvJg=; b=kIDhiR96Wc2/sKwMM361W4cDDn46R/qoZ6di4YLALJX4rjz0S5i39D5bgiT3eVjrXzLr+5 VKrNmS9udY5Oo1Bw== Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id 53B68139CC; Mon, 11 Sep 2023 19:11:06 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id lnDgEkpm/2R1UwAAMHmgww (envelope-from ); Mon, 11 Sep 2023 19:11:06 +0000 Date: Mon, 11 Sep 2023 21:11:05 +0200 From: David Disseldorp To: Bart Van Assche Cc: Dave Chinner , Kent Overstreet , James Bottomley , Matthew Wilcox , Christoph Hellwig , ksummit@lists.linux.dev, linux-fsdevel@vger.kernel.org, Hajime Tazaki , Octavian Purdila Subject: Re: [MAINTAINERS/KERNEL SUMMIT] Trust and maintenance of file systems Message-ID: <20230911211105.1050fb2c@echidna.fritz.box> In-Reply-To: <3c66d844-67e5-82d2-6d14-9f6c6b6fcc36@acm.org> References: <8dd2f626f16b0fc863d6a71561196950da7e893f.camel@HansenPartnership.com> <20230909224230.3hm4rqln33qspmma@moria.home.lan> <20230911012914.xoeowcbruxxonw7u@moria.home.lan> <20230911153515.2a256856@echidna.fritz.box> <3c66d844-67e5-82d2-6d14-9f6c6b6fcc36@acm.org> Precedence: bulk X-Mailing-List: ksummit@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Mon, 11 Sep 2023 10:45:31 -0700, Bart Van Assche wrote: > On 9/11/23 06:35, David Disseldorp wrote: > > The LKL block layer may also become useful for legacy storage support in > > future, e.g. SCSI protocol obsolescence. > > There are probably more Linux devices using SCSI than NVMe. There are > several billion Android phones in use. Modern Android phones use UFS > storage. UFS is based on SCSI. There are already UFS devices available > that support more than 300K IOPS and there are plans for improving > performance further. Moving the SCSI stack to user space would have a > very significant negative performance impact on Android devices. I could imagine cases where support for SBC <= X and SPC <= Y is deprecated or removed. SG_IO would probably be more applicable for legacy device support in user-space, but I think it still serves as a reasonable example for how LKL could also be useful. Cheers, David