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 750FB1A76D2; Thu, 29 Aug 2024 14:28:20 +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=1724941700; cv=none; b=ZBf71rBzv/zJw74e4R4WjIJ1nWUiGVcINBbbmBVa/UZ+stDffnRBSFTI52ejwTBCIafWSi8bhV8zulV/UI4RkTlk2QRzG0T4ZM34IOv8MSnUNCtPAO2u2wFXc7X7glre8ta6jMQW0Xs6lxwWQzlXcC2BuAFSQ/X3uPrEU8S7MVI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724941700; c=relaxed/simple; bh=AdjjXxDIIQiLX1lisVdPxLKumPWnuNzIibshIza6NzM=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=NPvFrjW73oJIf8p+jXR2FBeGPMBgTFbGe+qFSw2/hXhE7M8NhWERennxgIcDJL7eG46iiLchSDsQDQsEZ26tT6yiX4AZQQ454/d7NWoOk3fz8UPmNJVAjM2CB7q3ha4F2+sJEmUCDQWXDJE7gURjme3/GfpKYWx5w4pOpaLP+Z4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=nswG5a7U; 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="nswG5a7U" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7CCC7C4CEC1; Thu, 29 Aug 2024 14:28:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1724941700; bh=AdjjXxDIIQiLX1lisVdPxLKumPWnuNzIibshIza6NzM=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=nswG5a7UXb9n9xVWW5bWIDSYshM5s+9viowU1sKQktRZVHgUD5AvDLKO9XEzzrwBT c40C0HWL+dzrthP5PTpiVYEjAHdNtR1jZWgiOOiKnhU2aIqvbqb/+R1x2YXzcl36N0 pMvTWV0EGILHW3a379pG+Jmg/j2Qn6UM1d4IjCio+PMnzPY5uOKhrIbi4+ojNy5mN2 Vi69NwW5bGWT5NVNWpF2METmFQWZ3UAup7KjQ6oFLz7YsH9DOkNBwGpiY8M8yaELcT es9b0vbFr7LZ5mbUKlzqtLTLwpF8BgZH0Qmnlq4hhDSnJkHW838QBe8WL8tcJB3Wd+ kHE6x68ybPfDQ== Message-ID: Subject: Re: [PATCH v14 06/25] NFSD: Avoid using rqstp->rq_vers in nfsd_set_fh_dentry() From: Jeff Layton To: Mike Snitzer , linux-nfs@vger.kernel.org Cc: Chuck Lever , Anna Schumaker , Trond Myklebust , NeilBrown , linux-fsdevel@vger.kernel.org Date: Thu, 29 Aug 2024 10:28:18 -0400 In-Reply-To: <20240829010424.83693-7-snitzer@kernel.org> References: <20240829010424.83693-1-snitzer@kernel.org> <20240829010424.83693-7-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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> Currently, fh_verify() makes some daring assumptions about which > version of file handle the caller wants, based on the things it can > find in the passed-in rqstp. The about-to-be-introduced LOCALIO use > case sometimes has no svc_rqst context, so this logic won't work in > that case. >=20 > Instead, examine the passed-in file handle. It's .max_size field > should carry information to allow nfsd_set_fh_dentry() to initialize > the file handle appropriately. >=20 > lockd appears to be the only kernel consumer that does not set the > file handle .max_size during initialization. >=20 > write_filehandle() is the other question mark, as it looks possible > to specify a maxsize between NFS_FHSIZE and NFS3_FHSIZE here. >=20 > Signed-off-by: Chuck Lever > Signed-off-by: Mike Snitzer > --- > fs/nfsd/lockd.c | 6 ++++-- > fs/nfsd/nfsfh.c | 11 +++++++---- > 2 files changed, 11 insertions(+), 6 deletions(-) >=20 > diff --git a/fs/nfsd/lockd.c b/fs/nfsd/lockd.c > index 46a7f9b813e5..e636d2a1e664 100644 > --- a/fs/nfsd/lockd.c > +++ b/fs/nfsd/lockd.c > @@ -32,8 +32,10 @@ nlm_fopen(struct svc_rqst *rqstp, struct nfs_fh *f, st= ruct file **filp, > int access; > struct svc_fh fh; > =20 > - /* must initialize before using! but maxsize doesn't matter */ > - fh_init(&fh,0); > + if (rqstp->rq_vers =3D=3D 4) > + fh_init(&fh, NFS3_FHSIZE); > + else > + fh_init(&fh, NFS_FHSIZE); > fh.fh_handle.fh_size =3D f->size; > memcpy(&fh.fh_handle.fh_raw, f->data, f->size); > fh.fh_export =3D NULL; > diff --git a/fs/nfsd/nfsfh.c b/fs/nfsd/nfsfh.c > index 4b964a71a504..77acc26e8b02 100644 > --- a/fs/nfsd/nfsfh.c > +++ b/fs/nfsd/nfsfh.c > @@ -267,25 +267,28 @@ static __be32 nfsd_set_fh_dentry(struct svc_rqst *r= qstp, struct svc_fh *fhp) > fhp->fh_dentry =3D dentry; > fhp->fh_export =3D exp; > =20 > - switch (rqstp->rq_vers) { > - case 4: > + switch (fhp->fh_maxsize) { > + case NFS4_FHSIZE: > if (dentry->d_sb->s_export_op->flags & EXPORT_OP_NOATOMIC_ATTR) > fhp->fh_no_atomic_attr =3D true; > fhp->fh_64bit_cookies =3D true; > break; > - case 3: > + case NFS3_FHSIZE: > if (dentry->d_sb->s_export_op->flags & EXPORT_OP_NOWCC) > fhp->fh_no_wcc =3D true; > fhp->fh_64bit_cookies =3D true; > if (exp->ex_flags & NFSEXP_V4ROOT) > goto out; > break; > - case 2: > + case NFS_FHSIZE: > fhp->fh_no_wcc =3D true; > if (EX_WGATHER(exp)) > fhp->fh_use_wgather =3D true; > if (exp->ex_flags & NFSEXP_V4ROOT) > goto out; > + break; > + case 0: > + WARN_ONCE(1, "Uninitialized file handle"); > } > =20 > return 0; Reviewed-by: Jeff Layton