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Date: Wed, 21 Oct 2020 08:09:18 -0700 From: Randy Dunlap <rdunlap@...radead.org> To: Sergei Shtepa <sergei.shtepa@...am.com>, axboe@...nel.dk, viro@...iv.linux.org.uk, hch@...radead.org, darrick.wong@...cle.com, linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org, rjw@...ysocki.net, len.brown@...el.com, pavel@....cz, akpm@...ux-foundation.org, johannes.thumshirn@....com, ming.lei@...hat.com, jack@...e.cz, tj@...nel.org, gustavo@...eddedor.com, bvanassche@....org, osandov@...com, koct9i@...il.com, damien.lemoal@....com, steve@....org, linux-block@...r.kernel.org, linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org, linux-mm@...ck.org Subject: Re: [PATCH 1/2] Block layer filter - second version On 10/21/20 2:04 AM, Sergei Shtepa wrote: > diff --git a/block/Kconfig b/block/Kconfig > index bbad5e8bbffe..a308801b4376 100644 > --- a/block/Kconfig > +++ b/block/Kconfig > @@ -204,6 +204,17 @@ config BLK_INLINE_ENCRYPTION_FALLBACK > by falling back to the kernel crypto API when inline > encryption hardware is not present. > > +config BLK_FILTER > + bool "Enable support for block layer filters" > + default y Drop the default y. We don't add modules to a default build without some tough justification. > + depends on MODULES > + help > + Enabling this lets third-party kernel modules intercept lets loadable kernel modules intercept > + bio requests for any block device. This allows them to implement > + changed block tracking and snapshots without any reconfiguration of > + the existing setup. For example, this option allows snapshotting of > + a block device without adding it to LVM. -- ~Randy
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