From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9DC502C1BA for ; Sun, 30 Jun 2024 19:52:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719777173; cv=none; b=CnUAJre51HUWNekC3AFS5x9lFLiLv5dFRr1sIG6l4OLi1NsSDUgrBW2yh2xu63gTQjwCyssOFxvIIMbGujRb8aiEMF29mj4nw/Y21WdudNPP5dW/xJs2BjO5AKhgEegpH4eqrpNOCt5xdcIcQgxzSok7CN0dnh21ZRmnJ0TNGQ0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719777173; c=relaxed/simple; bh=YMI2U4o76Fhs7cU+dziePfB0Ez0Aq2kGsoorcLM7cQk=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=ZhBwlSFCEozAF1/lcxPvmn3IesB6xhwQ8r6/WSNnTVP7YL9T0YSyBSvdGr9ExX5fhujKCMq5uMWCpyzP8vxiB74ELq+oxAGfObT1kmBdWYccagJ8MPb5nm+TZjkavTdHdzTVeP6jehPk4HffdN0Xdmv8GhM9dmBGci+15jVwYyk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=rncnJtF4; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="rncnJtF4" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C5E2CC2BD10; Sun, 30 Jun 2024 19:52:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1719777173; bh=YMI2U4o76Fhs7cU+dziePfB0Ez0Aq2kGsoorcLM7cQk=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=rncnJtF4laUx/CmiB3voTIjdS9gIk/PCYuKEyATkQGvHudJaGRSxsLf2JDmj4ryNZ c/EQaQllsPauRlf7X22kKocGEb6NB8Jit/Mmvc/60Rf2LmA0rpo6h5xBZEi95gfMmQ cTAClxWpueJhLgHdwvKDPY8S4hZxnYsuQr86cFUYgnIKn7Y6udL1DB5TdEl3w+KVfy 0sY7oCuM2shrceFGtDOVfhWpLtkCThwxW1GdsBhhCmmCTejMtFEZYOs4u2abkJ+X1Z 0lNRJV22Siq3wKYvuYT3JsWgORxpwBmAXhSt7oAFQgyKD26Auh5EaqkxyjbhaAAjyg C5Lac8cuPEhBg== Message-ID: <359d5b252f6f5a7eb348c79beb00a9e6594b743c.camel@kernel.org> Subject: Re: [PATCH v9 13/19] nfsd: add "localio" support From: Jeff Layton To: Mike Snitzer , Chuck Lever Cc: linux-nfs@vger.kernel.org, Anna Schumaker , Trond Myklebust , NeilBrown , snitzer@hammerspace.com Date: Sun, 30 Jun 2024 15:52:51 -0400 In-Reply-To: References: <20240628211105.54736-1-snitzer@kernel.org> <20240628211105.54736-14-snitzer@kernel.org> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV T2h6v8i8YqsATFPwO4nuiTmL6I40ZofxVd+9wdRI4Db8yUNA4ZSP2nqLcLtFjClYRBoJvRWvsv4lm 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10:49:51AM -0400, Chuck Lever wrote: > > On Sat, Jun 29, 2024 at 06:18:42PM -0400, Chuck Lever wrote: > > > > + > > > > + /* nfs_fh -> svc_fh */ > > > > + if (nfs_fh->size > NFS4_FHSIZE) { > > > > + status =3D -EINVAL; > > > > + goto out; > > > > + } > > > > + fh_init(&fh, NFS4_FHSIZE); > > > > + fh.fh_handle.fh_size =3D nfs_fh->size; > > > > + memcpy(fh.fh_handle.fh_raw, nfs_fh->data, nfs_fh->size); > > > > + > > > > + if (fmode & FMODE_READ) > > > > + mayflags |=3D NFSD_MAY_READ; > > > > + if (fmode & FMODE_WRITE) > > > > + mayflags |=3D NFSD_MAY_WRITE; > > > > + > > > > + beres =3D nfsd_file_acquire(rqstp, &fh, mayflags, &nf); > > > > + if (beres) { > > > > + status =3D nfs_stat_to_errno(be32_to_cpu(beres)); > > > > + goto out_fh_put; > > > > + } > > >=20 > > > So I'm wondering whether just calling fh_verify() and then > > > nfsd_open_verified() would be simpler and/or good enough here. Is > > > there a strong reason to use the file cache for locally opened > > > files? Jeff, any thoughts? > >=20 > > > Will there be writeback ramifications for > > > doing this? Maybe we need a comment here explaining how these files > > > are garbage collected (just an fput by the local I/O client, I would > > > guess). > >=20 > > OK, going back to this: Since right here we immediately call=20 > >=20 > > nfsd_file_put(nf); > >=20 > > There are no writeback ramifications nor any need to comment about > > garbage collection. But this still seems like a lot of (possibly > > unnecessary) overhead for simply obtaining a struct file. >=20 > Easy enough change, probably best to avoid the filecache but would like > to verify with Jeff before switching: >=20 > diff --git a/fs/nfsd/localio.c b/fs/nfsd/localio.c > index 1d6508aa931e..85ebf63789fb 100644 > --- a/fs/nfsd/localio.c > +++ b/fs/nfsd/localio.c > @@ -197,7 +197,6 @@ int nfsd_open_local_fh(struct net *cl_nfssvc_net, > const struct cred *save_cred; > struct svc_rqst *rqstp; > struct svc_fh fh; > - struct nfsd_file *nf; > __be32 beres; >=20 > if (nfs_fh->size > NFS4_FHSIZE) > @@ -235,13 +234,12 @@ int nfsd_open_local_fh(struct net *cl_nfssvc_net, > if (fmode & FMODE_WRITE) > mayflags |=3D NFSD_MAY_WRITE; >=20 > - beres =3D nfsd_file_acquire(rqstp, &fh, mayflags, &nf); > + beres =3D fh_verify(rqstp, &fh, S_IFREG, mayflags); > if (beres) { > status =3D nfs_stat_to_errno(be32_to_cpu(beres)); > goto out_fh_put; > } > - *pfilp =3D get_file(nf->nf_file); > - nfsd_file_put(nf); > + status =3D nfsd_open_verified(rqstp, &fh, mayflags, pfilp); > out_fh_put: > fh_put(&fh); > nfsd_local_fakerqst_destroy(rqstp); >=20 My suggestion would be to _not_ do this. I think you do want to use the filecache (mostly for performance reasons). --=20 Jeff Layton