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Registered in England and Wales under Company Registration No. 3798903 From: David Howells In-Reply-To: References: <162876946134.3068428.15475611190876694695.stgit@warthog.procyon.org.uk> <162876947840.3068428.12591293664586646085.stgit@warthog.procyon.org.uk> To: Matthew Wilcox Cc: dhowells@redhat.com, trond.myklebust@primarydata.com, darrick.wong@oracle.com, hch@lst.de, jlayton@kernel.org, sfrench@samba.org, torvalds@linux-foundation.org, linux-nfs@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 2/2] mm: Make swap_readpage() for SWP_FS_OPS use ->direct_IO() not ->readpage() MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-ID: <3088326.1628774588.1@warthog.procyon.org.uk> Date: Thu, 12 Aug 2021 14:23:08 +0100 Message-ID: <3088327.1628774588@warthog.procyon.org.uk> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Authentication-Results: imf29.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=izAFebul; dmarc=pass (policy=none) header.from=redhat.com; spf=none (imf29.hostedemail.com: domain of dhowells@redhat.com has no SPF policy when checking 216.205.24.124) smtp.mailfrom=dhowells@redhat.com X-Stat-Signature: b9ft1xp3uxtt5ksoqrzpruxpn4g6bjnp X-Rspamd-Queue-Id: 5ACC89005BA1 X-Rspamd-Server: rspam05 X-HE-Tag: 1628774595-464190 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Matthew Wilcox wrote: > After submitting the IO here ... > > > + if (ret != -EIOCBQUEUED) > > + swapfile_read_complete(&ki->iocb, ret, 0); > > We only touch the 'ki' here ... if the caller didn't call read_complete > > > + swapfile_put_kiocb(ki); > > Except for here, which is only touched in order to put the refcount. > > So why can't swapfile_read_complete() do the work of freeing the ki? When I was doing something similar for cachefiles, I couldn't get it to work like that. I'll have another look at that. David