From owner-svn-src-head@freebsd.org Thu Nov 29 17:52:48 2018 Return-Path: Delivered-To: svn-src-head@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 69C4C1146A44 for ; Thu, 29 Nov 2018 17:52:48 +0000 (UTC) (envelope-from wlosh@bsdimp.com) Received: from mail-qt1-x82b.google.com (mail-qt1-x82b.google.com [IPv6:2607:f8b0:4864:20::82b]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 8F8B1794EF for ; Thu, 29 Nov 2018 17:52:47 +0000 (UTC) (envelope-from wlosh@bsdimp.com) Received: by mail-qt1-x82b.google.com with SMTP id n32so2928535qte.11 for ; Thu, 29 Nov 2018 09:52:47 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bsdimp-com.20150623.gappssmtp.com; s=20150623; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=OWS6j1Hdc2MAuGlnVTG/JkzKtZHoAnfE+wHwJVotBiQ=; b=hz8NGhMCv/MxpUqqn0nBtG2YTB/scuBz91crcG7bxI6mdIDKZfI9q15FQkRpOEp2RG uHzUTXQ0wCVxjHj2CRA0cIlyECDg19Xh9JV7vREZU18GwiiMHP0Anf1o30HLJ8tEXmqq tCIkvZf39pZcaa7pXWR9lKatyPKIK8OOuv2G+214QiP5qQUEx57wvpkejzpnUfLCCgiu 2fewTIU5x2wFVPg9SyG1grqSphfBMhG5d0klLNWuLN/s+uGCdDx3wZAAgW/OTXpq12dQ /aIHTEBPZt0UxRKagBTIHxiKpkOkmKfNJtuH4o66vCKNsrLbZbsqHsHRvd5BEJKcV7Ts D1iw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=OWS6j1Hdc2MAuGlnVTG/JkzKtZHoAnfE+wHwJVotBiQ=; b=s6Db84j2aRZHBL14+7IXi+3mbqowmqyPfPDRb2T+gambzL33iYGaYf0SchjuKGrTpF Bzl/NUVcNQCp2iOzjvoiQTSPzD9oQMbwqZWYFspNAOjEz92/kIWffgj561Kh14h7X+fB XVcONAhqY4PeNmRzT41W1EQWvHH8bqC66nzAeH+ypO207m7GPYgeKu8Nd9h7NUlgdonF oodcQd436NtRjp76D+URQKcxK9tZN8TzwVpZoX9B0H7CqJZE5HinSHrNFeiySTUDuHqM hEIylQCYVHmtgM9Y/ekkoS2jVxjLvebV1NW5K/DDr+ejNIITkGq7l6MtIM61dVsPI1vg GL8A== X-Gm-Message-State: AA+aEWY4d7b+SDnevPxYe6S/8aOEMl5l1CbB1a3VdHPx/NumRr7+/jTc m1ch8be9KobBGdkvHpuFzre0zwm1crEL4A6HrFCuzQ== X-Google-Smtp-Source: AFSGD/UmN2VRCfeRIf7RajhvlISzKg4DJgOYOzZ4Z0nF8gxlM8x3Eq6p4hUM/xIfaTxKyZDQMWQt7zyGDMPyFbPrW+A= X-Received: by 2002:a0c:9549:: with SMTP id m9mr2413408qvm.214.1543513967055; Thu, 29 Nov 2018 09:52:47 -0800 (PST) MIME-Version: 1.0 References: <201811291421.wATELQbx059318@repo.freebsd.org> <9812F670-DD3D-4A56-A826-28B4A055F488@jnielsen.net> In-Reply-To: <9812F670-DD3D-4A56-A826-28B4A055F488@jnielsen.net> From: Warner Losh Date: Thu, 29 Nov 2018 10:52:35 -0700 Message-ID: Subject: Re: svn commit: r341232 - in head/usr.bin: . trim To: lists@jnielsen.net Cc: Eugene Grosbein , src-committers , svn-src-all@freebsd.org, svn-src-head@freebsd.org X-Rspamd-Queue-Id: 8F8B1794EF X-Spamd-Result: default: False [-3.50 / 15.00]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-0.98)[-0.984,0]; R_DKIM_ALLOW(-0.20)[bsdimp-com.20150623.gappssmtp.com]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; NEURAL_HAM_LONG(-1.00)[-0.997,0]; MIME_GOOD(-0.10)[multipart/alternative,text/plain]; PREVIOUSLY_DELIVERED(0.00)[svn-src-head@freebsd.org]; DMARC_NA(0.00)[bsdimp.com]; RCPT_COUNT_FIVE(0.00)[5]; TO_MATCH_ENVRCPT_SOME(0.00)[]; DKIM_TRACE(0.00)[bsdimp-com.20150623.gappssmtp.com:+]; MX_GOOD(-0.01)[cached: ALT1.aspmx.l.google.com]; RCVD_IN_DNSWL_NONE(0.00)[b.2.8.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.0.0.4.6.8.4.0.b.8.f.7.0.6.2.list.dnswl.org : 127.0.5.0]; NEURAL_HAM_SHORT(-0.87)[-0.873,0]; R_SPF_NA(0.00)[]; FORGED_SENDER(0.30)[imp@bsdimp.com,wlosh@bsdimp.com]; RCVD_TLS_LAST(0.00)[]; IP_SCORE(-0.63)[ipnet: 2607:f8b0::/32(-1.75), asn: 15169(-1.33), country: US(-0.09)]; ASN(0.00)[asn:15169, ipnet:2607:f8b0::/32, country:US]; FROM_NEQ_ENVFROM(0.00)[imp@bsdimp.com,wlosh@bsdimp.com]; RCVD_COUNT_TWO(0.00)[2] X-Rspamd-Server: mx1.freebsd.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Content-Filtered-By: Mailman/MimeDel 2.1.29 X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Nov 2018 17:52:48 -0000 On Thu, Nov 29, 2018 at 10:04 AM John Nielsen wrote: > > On Nov 29, 2018, at 7:21 AM, Eugene Grosbein wrote: > > > > Author: eugen > > Date: Thu Nov 29 14:21:26 2018 > > New Revision: 341232 > > URL: https://svnweb.freebsd.org/changeset/base/341232 > > > > Log: > > Add new small tool trim(1) to delete contents for blocks on flash > > based storage devices that use wear-leveling algorithms. > > > > [snip] > > > +.Sh DESCRIPTION > > +The > > +.Nm > > +utility erases specified region of the device. > > +It is only relevant for flash based storage devices that use > wear-leveling > > +algorithms. > > I=E2=80=99m curious, would this also be useful for virtual disks or SAN/N= AS > devices backed by thinly-provisioned storage? > Yes. It is. Any device that supports BIO_DELETE the trim will work on. It could work on files within a filesystem, but not in its current state. ftruncate, however, is a better match there. None of the filesystems support the DIOCDELETE ioctl. Warner