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s=k20201202; t=1710780627; bh=l3PoKoMQDhUnOx6lel3PPfd5dqnCNIQSQVtVMT8tHqM=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=a2hgJPBHRx0JGNyyoP6sK8i5T0/W2XPZ+v/HWi47ICNv1RZ5xpzbew2f1TFePTIco xlZTBdtKe3hQn05h/9p/HKbAtIM0bEbZx1vvymVicbr/DGXTqEjHPCbChIsJtMLEPe SO9l0eCtsEFDlM2olHCcU+XwXVMymW/UhikyOoNiQNQxJ8lsmfR3TGCmFmS1SCpvjg 8z3+IaGSQSTcgf0zbgbf/gAMdHxY4WPglAwyLeqIKfCrQW3bInxYvNxfu8sCE1klCP GYN+vOlRbwfbgdMZZSnIBgGWEHFiP+3/BBJg0AVoAnZlphkHRu+IHzAC531oqg0Q4u vphFbb6iOE9tQ== Message-ID: <6909dafbefeafa14465a304b6b8b5ad457d5596a.camel@kernel.org> Subject: Re: [PATCH] nfsd: Fix error cleanup path in nfsd_rename() From: Jeff Layton To: Jan Kara , Chuck Lever Cc: Christian Brauner , Al Viro , linux-nfs@vger.kernel.org Date: Mon, 18 Mar 2024 12:50:25 -0400 In-Reply-To: <20240318163209.26493-1-jack@suse.cz> References: <20240318163209.26493-1-jack@suse.cz> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; 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 kZWuOsJdJQdmwlWC5L5ln9xgfr/4mOY38B0U= Content-Type: text/plain; charset="ISO-8859-15" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.50.4 (3.50.4-1.fc39) Precedence: bulk X-Mailing-List: linux-nfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Mon, 2024-03-18 at 17:32 +0100, Jan Kara wrote: > Commit a8b0026847b8 ("rename(): avoid a deadlock in the case of parents > having no common ancestor") added an error bail out path. However this > path does not drop the remount protection that has been acquired. Fix > the cleanup path to properly drop the remount protection. >=20 > Fixes: a8b0026847b8 ("rename(): avoid a deadlock in the case of parents h= aving no common ancestor") > Signed-off-by: Jan Kara > --- > fs/nfsd/vfs.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) >=20 > diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c > index 6a9464262fae..2e41eb4c3cec 100644 > --- a/fs/nfsd/vfs.c > +++ b/fs/nfsd/vfs.c > @@ -1852,7 +1852,7 @@ nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *= ffhp, char *fname, int flen, > trap =3D lock_rename(tdentry, fdentry); > if (IS_ERR(trap)) { > err =3D (rqstp->rq_vers =3D=3D 2) ? nfserr_acces : nfserr_xdev; > - goto out; > + goto out_want_write; > } > err =3D fh_fill_pre_attrs(ffhp); > if (err !=3D nfs_ok) > @@ -1922,6 +1922,7 @@ nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *= ffhp, char *fname, int flen, > } > out_unlock: > unlock_rename(tdentry, fdentry); > +out_want_write: > fh_drop_write(ffhp); > =20 > /* Nice catch. Reviewed-by: Jeff Layton