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 AF61033BBD8; Wed, 12 Nov 2025 14:51:44 +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=1762959104; cv=none; b=FtDY0fVEPduw1LkBbBasMLQO2yt4Rhg2i9jUI6KGvw4SuL1WMaUqBhZOkb87Dv3+p+aAPzwCVFjTQaeuGQH52nqd1oji1MufcsXBVEHK9hvcYpc8F4qvGs2fLjVBDXstJXoOYHKD8fCNZxjE0vaPZXlhLIxXjuyVnyV4uxZAumc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762959104; c=relaxed/simple; bh=zBtRfSBRDSlQlfWa7ypA6PUKFo3/OFgFG8qDYccyYTo=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=gOGSaIX5H80mZd8/2OVvAw6xHOmcmEfN9+184qzkCE/psHxwgC20mOJyngP3QSMlJgRRxCMR92WUjPTvabBw5tRBG0SwZfRaciQjfWAx1vniZckyuYlQgpXsgr7esmkyXdWCuo4N5OkIBoSe142qqREoN6f4W7z8MdVsgI285fE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=MiQOmAw7; 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="MiQOmAw7" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4D77AC16AAE; Wed, 12 Nov 2025 14:51:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1762959104; bh=zBtRfSBRDSlQlfWa7ypA6PUKFo3/OFgFG8qDYccyYTo=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=MiQOmAw7PdZSwBXHVuNcaPxtvpuQX2BHkG3MpBJNtKrbdCEMs+Qu8I6xnmJBQa3nN CXorYZJk2PprCtwIlzEHjo6Idg/No7ZXTUMTn+pJYrjIwejrVTngXcmT8NPwm2FBuM w+L5xInZtgP80NoX5nhPi3O/F3PiSyZRiWaqAmdNwhzquMXy5nYtz664W1DpgtJQ2o MoAuyLqv15qocCT9MjrRgF9M8tvCOvth2fwBNsRuSi+VHYOz7RI/RAHbSMDr0w1P4S spMC7X7VpFFWSakK8NkTPGimch3Y2yUlIp8BZO2ydRDb/QzhqijALYqyUOTG4Zs1i4 eFUgamR0DdvUA== Message-ID: <230c32bf9997f26b0cfe8c1a4c9309cf91c5071c.camel@kernel.org> Subject: Re: [PATCH v5 05/14] VFS/nfsd/cachefiles/ovl: introduce start_removing() and end_removing() From: Jeff Layton To: NeilBrown , Alexander Viro , Christian Brauner , Amir Goldstein Cc: Jan Kara , linux-fsdevel@vger.kernel.org, Chris Mason , David Sterba , David Howells , Greg Kroah-Hartman , "Rafael J. Wysocki" , Danilo Krummrich , Tyler Hicks , Miklos Szeredi , Chuck Lever , Olga Kornievskaia , Dai Ngo , Namjae Jeon , Steve French , Sergey Senozhatsky , Carlos Maiolino , John Johansen , Paul Moore , James Morris , "Serge E. Hallyn" , Stephen Smalley , Ondrej Mosnacek , Mateusz Guzik , Lorenzo Stoakes , Stefan Berger , "Darrick J. Wong" , linux-kernel@vger.kernel.org, netfs@lists.linux.dev, ecryptfs@vger.kernel.org, linux-nfs@vger.kernel.org, linux-unionfs@vger.kernel.org, linux-cifs@vger.kernel.org, linux-xfs@vger.kernel.org, linux-security-module@vger.kernel.org, selinux@vger.kernel.org Date: Wed, 12 Nov 2025 09:51:40 -0500 In-Reply-To: <20251106005333.956321-6-neilb@ownmail.net> References: <20251106005333.956321-1-neilb@ownmail.net> <20251106005333.956321-6-neilb@ownmail.net> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV T2h6v8i8YqsATFPwO4nuiTmL6I40ZofxVd+9wdRI4Db8yUNA4ZSP2nqLcLtFjClYRBoJvRWvsv4lm 0OX6MYPtv76hka8lW4mnRmZqqx3UtfHX/hF/zH24Gj7A6sYKYLCU3YrI2Ogiu7/ksKcl7goQjpvtV YrOOI5VGLHge0awt7bhMCTM9KAfPc+xL/ZxAMVWd3NCk5SamL2cE99UWgtvNOIYU8m6EjTLhsj8sn 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DfX/sn9XcfoVZIxMpCRE750zvJvcCUz9HojsrMQ1NFc7MFT1z3MOW2/RlzPcog7xvR5ENPH19ojRD CHqumUHRry+RF0lH00clzX/W8OrQJZtoBPXv9ahka/Vp7kEulcBJr1cH5Wz/WprhsIM7U9pse1f1g Yy9YbXtWctUz8uvDR7shsQxAhX3qO7DilMtuGo1v97I/Kx4gXQ52syh/w6EBny71CZrOgD6kJwPVV AaM1LRC28muq91WCFhs/nzHozpbzcheyGtMUI2Ao4K6mnY+3zIuXPygZMFr9KXE6fF7HzKxKuZMJO aEZCiDOq0anx6FmOzs5E6Jqdpo/mtI8beK+BE7Va6ni7YrQlnT0i3vaTVMTiCThbqsB20VrbMjlhp f8lfK1XVNbRq/R7GZ9zHESlsa35ha60yd/j3pu5hT2xyy8krV8vGhHvnJ1XRMJBAB/UYb6FyC7S+m QZIQXVeAA+smfTT0tDrisj1U5x6ZB9b3nBg65kc= Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.58.1 (3.58.1-1.fc43) Precedence: bulk X-Mailing-List: netfs@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Thu, 2025-11-06 at 11:50 +1100, NeilBrown wrote: > From: NeilBrown >=20 > start_removing() is similar to start_creating() but will only return a > positive dentry with the expectation that it will be removed. This is > used by nfsd, cachefiles, and overlayfs. They are changed to also use > end_removing() to terminate the action begun by start_removing(). This > is a simple alias for end_dirop(). >=20 > Apart from changes to the error paths, as we no longer need to unlock on > a lookup error, an effect on callers is that they don't need to test if > the found dentry is positive or negative - they can be sure it is > positive. >=20 > Reviewed-by: Amir Goldstein > Signed-off-by: NeilBrown > --- > fs/cachefiles/namei.c | 32 ++++++++++++++------------------ > fs/namei.c | 27 +++++++++++++++++++++++++++ > fs/nfsd/nfs4recover.c | 18 +++++------------- > fs/nfsd/vfs.c | 26 ++++++++++---------------- > fs/overlayfs/dir.c | 15 +++++++-------- > fs/overlayfs/overlayfs.h | 8 ++++++++ > include/linux/namei.h | 18 ++++++++++++++++++ > 7 files changed, 89 insertions(+), 55 deletions(-) >=20 > diff --git a/fs/cachefiles/namei.c b/fs/cachefiles/namei.c > index 0a136eb434da..c7f0c6ab9b88 100644 > --- a/fs/cachefiles/namei.c > +++ b/fs/cachefiles/namei.c > @@ -260,6 +260,7 @@ static int cachefiles_unlink(struct cachefiles_cache = *cache, > * - File backed objects are unlinked > * - Directory backed objects are stuffed into the graveyard for userspa= ce to > * delete > + * On entry dir must be locked. It will be unlocked on exit. > */ > int cachefiles_bury_object(struct cachefiles_cache *cache, > struct cachefiles_object *object, > @@ -274,28 +275,30 @@ int cachefiles_bury_object(struct cachefiles_cache = *cache, > =20 > _enter(",'%pd','%pd'", dir, rep); > =20 > + /* end_removing() will dput() @rep but we need to keep > + * a ref, so take one now. This also stops the dentry > + * being negated when unlinked which we need. > + */ > + dget(rep); > + > if (rep->d_parent !=3D dir) { > - inode_unlock(d_inode(dir)); > + end_removing(rep); > _leave(" =3D -ESTALE"); > return -ESTALE; > } > =20 > /* non-directories can just be unlinked */ > if (!d_is_dir(rep)) { > - dget(rep); /* Stop the dentry being negated if it's only pinned > - * by a file struct. > - */ > ret =3D cachefiles_unlink(cache, object, dir, rep, why); > - dput(rep); > + end_removing(rep); > =20 > - inode_unlock(d_inode(dir)); > _leave(" =3D %d", ret); > return ret; > } > =20 > /* directories have to be moved to the graveyard */ > _debug("move stale object to graveyard"); > - inode_unlock(d_inode(dir)); > + end_removing(rep); > =20 > try_again: > /* first step is to make up a grave dentry in the graveyard */ > @@ -749,26 +752,20 @@ static struct dentry *cachefiles_lookup_for_cull(st= ruct cachefiles_cache *cache, > struct dentry *victim; > int ret =3D -ENOENT; > =20 > - inode_lock_nested(d_inode(dir), I_MUTEX_PARENT); > + victim =3D start_removing(&nop_mnt_idmap, dir, &QSTR(filename)); > =20 > - victim =3D lookup_one(&nop_mnt_idmap, &QSTR(filename), dir); > if (IS_ERR(victim)) > goto lookup_error; > - if (d_is_negative(victim)) > - goto lookup_put; > if (d_inode(victim)->i_flags & S_KERNEL_FILE) > goto lookup_busy; > return victim; > =20 > lookup_busy: > ret =3D -EBUSY; > -lookup_put: > - inode_unlock(d_inode(dir)); > - dput(victim); > + end_removing(victim); > return ERR_PTR(ret); > =20 > lookup_error: > - inode_unlock(d_inode(dir)); > ret =3D PTR_ERR(victim); > if (ret =3D=3D -ENOENT) > return ERR_PTR(-ESTALE); /* Probably got retired by the netfs */ > @@ -816,18 +813,17 @@ int cachefiles_cull(struct cachefiles_cache *cache,= struct dentry *dir, > =20 > ret =3D cachefiles_bury_object(cache, NULL, dir, victim, > FSCACHE_OBJECT_WAS_CULLED); > + dput(victim); > if (ret < 0) > goto error; > =20 > fscache_count_culled(); > - dput(victim); > _leave(" =3D 0"); > return 0; > =20 > error_unlock: > - inode_unlock(d_inode(dir)); > + end_removing(victim); > error: > - dput(victim); > if (ret =3D=3D -ENOENT) > return -ESTALE; /* Probably got retired by the netfs */ > =20 > diff --git a/fs/namei.c b/fs/namei.c > index 8873ad0f05b0..38dda29552f6 100644 > --- a/fs/namei.c > +++ b/fs/namei.c > @@ -3248,6 +3248,33 @@ struct dentry *start_creating(struct mnt_idmap *id= map, struct dentry *parent, > } > EXPORT_SYMBOL(start_creating); > =20 > +/** > + * start_removing - prepare to remove a given name with permission check= ing > + * @idmap: idmap of the mount > + * @parent: directory in which to find the name > + * @name: the name to be removed > + * > + * Locks are taken and a lookup in performed prior to removing > + * an object from a directory. Permission checking (MAY_EXEC) is perfor= med > + * against @idmap. > + * > + * If the name doesn't exist, an error is returned. > + * > + * end_removing() should be called when removal is complete, or aborted. > + * > + * Returns: a positive dentry, or an error. > + */ > +struct dentry *start_removing(struct mnt_idmap *idmap, struct dentry *pa= rent, > + struct qstr *name) > +{ > + int err =3D lookup_one_common(idmap, name, parent); > + > + if (err) > + return ERR_PTR(err); > + return start_dirop(parent, name, 0); > +} > +EXPORT_SYMBOL(start_removing); > + > #ifdef CONFIG_UNIX98_PTYS > int path_pts(struct path *path) > { > diff --git a/fs/nfsd/nfs4recover.c b/fs/nfsd/nfs4recover.c > index c247a7c3291c..3eefaa2202e3 100644 > --- a/fs/nfsd/nfs4recover.c > +++ b/fs/nfsd/nfs4recover.c > @@ -324,20 +324,12 @@ nfsd4_unlink_clid_dir(char *name, struct nfsd_net *= nn) > dprintk("NFSD: nfsd4_unlink_clid_dir. name %s\n", name); > =20 > dir =3D nn->rec_file->f_path.dentry; > - inode_lock_nested(d_inode(dir), I_MUTEX_PARENT); > - dentry =3D lookup_one(&nop_mnt_idmap, &QSTR(name), dir); > - if (IS_ERR(dentry)) { > - status =3D PTR_ERR(dentry); > - goto out_unlock; > - } > - status =3D -ENOENT; > - if (d_really_is_negative(dentry)) > - goto out; > + dentry =3D start_removing(&nop_mnt_idmap, dir, &QSTR(name)); > + if (IS_ERR(dentry)) > + return PTR_ERR(dentry); > + > status =3D vfs_rmdir(&nop_mnt_idmap, d_inode(dir), dentry); > -out: > - dput(dentry); > -out_unlock: > - inode_unlock(d_inode(dir)); > + end_removing(dentry); > return status; > } > =20 > diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c > index 24e501abad0e..6291c371caa7 100644 > --- a/fs/nfsd/vfs.c > +++ b/fs/nfsd/vfs.c > @@ -2044,7 +2044,7 @@ nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *= fhp, int type, > { > struct dentry *dentry, *rdentry; > struct inode *dirp; > - struct inode *rinode; > + struct inode *rinode =3D NULL; > __be32 err; > int host_err; > =20 > @@ -2063,24 +2063,21 @@ nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh= *fhp, int type, > =20 > dentry =3D fhp->fh_dentry; > dirp =3D d_inode(dentry); > - inode_lock_nested(dirp, I_MUTEX_PARENT); > =20 > - rdentry =3D lookup_one(&nop_mnt_idmap, &QSTR_LEN(fname, flen), dentry); > + rdentry =3D start_removing(&nop_mnt_idmap, dentry, &QSTR_LEN(fname, fle= n)); > + > host_err =3D PTR_ERR(rdentry); > if (IS_ERR(rdentry)) > - goto out_unlock; > + goto out_drop_write; > =20 > - if (d_really_is_negative(rdentry)) { > - dput(rdentry); > - host_err =3D -ENOENT; > - goto out_unlock; > - } > - rinode =3D d_inode(rdentry); > err =3D fh_fill_pre_attrs(fhp); > if (err !=3D nfs_ok) > goto out_unlock; > =20 > + rinode =3D d_inode(rdentry); > + /* Prevent truncation until after locks dropped */ > ihold(rinode); > + > if (!type) > type =3D d_inode(rdentry)->i_mode & S_IFMT; > =20 > @@ -2102,10 +2099,10 @@ nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh= *fhp, int type, > } > fh_fill_post_attrs(fhp); > =20 > - inode_unlock(dirp); > - if (!host_err) > +out_unlock: > + end_removing(rdentry); > + if (!err && !host_err) > host_err =3D commit_metadata(fhp); > - dput(rdentry); > iput(rinode); /* truncate the inode here */ > =20 > out_drop_write: > @@ -2123,9 +2120,6 @@ nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *= fhp, int type, > } > out: > return err !=3D nfs_ok ? err : nfserrno(host_err); > -out_unlock: > - inode_unlock(dirp); > - goto out_drop_write; > } > =20 > /* > diff --git a/fs/overlayfs/dir.c b/fs/overlayfs/dir.c > index b9160fefbd00..20682afdbd20 100644 > --- a/fs/overlayfs/dir.c > +++ b/fs/overlayfs/dir.c > @@ -866,17 +866,17 @@ static int ovl_remove_upper(struct dentry *dentry, = bool is_dir, > goto out; > } > =20 > - inode_lock_nested(dir, I_MUTEX_PARENT); > - upper =3D ovl_lookup_upper(ofs, dentry->d_name.name, upperdir, > - dentry->d_name.len); > + upper =3D ovl_start_removing_upper(ofs, upperdir, > + &QSTR_LEN(dentry->d_name.name, > + dentry->d_name.len)); > err =3D PTR_ERR(upper); > if (IS_ERR(upper)) > - goto out_unlock; > + goto out_dput; > =20 > err =3D -ESTALE; > if ((opaquedir && upper !=3D opaquedir) || > (!opaquedir && !ovl_matches_upper(dentry, upper))) > - goto out_dput_upper; > + goto out_unlock; > =20 > if (is_dir) > err =3D ovl_do_rmdir(ofs, dir, upper); > @@ -892,10 +892,9 @@ static int ovl_remove_upper(struct dentry *dentry, b= ool is_dir, > */ > if (!err) > d_drop(dentry); > -out_dput_upper: > - dput(upper); > out_unlock: > - inode_unlock(dir); > + end_removing(upper); > +out_dput: > dput(opaquedir); > out: > return err; > diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h > index beeba96cfcb2..49ad65f829dc 100644 > --- a/fs/overlayfs/overlayfs.h > +++ b/fs/overlayfs/overlayfs.h > @@ -423,6 +423,14 @@ static inline struct dentry *ovl_start_creating_uppe= r(struct ovl_fs *ofs, > parent, name); > } > =20 > +static inline struct dentry *ovl_start_removing_upper(struct ovl_fs *ofs= , > + struct dentry *parent, > + struct qstr *name) > +{ > + return start_removing(ovl_upper_mnt_idmap(ofs), > + parent, name); > +} > + > static inline bool ovl_open_flags_need_copy_up(int flags) > { > if (!flags) > diff --git a/include/linux/namei.h b/include/linux/namei.h > index 37b72f4a64f0..6d1069f93ebf 100644 > --- a/include/linux/namei.h > +++ b/include/linux/namei.h > @@ -91,6 +91,8 @@ struct dentry *lookup_one_positive_killable(struct mnt_= idmap *idmap, > =20 > struct dentry *start_creating(struct mnt_idmap *idmap, struct dentry *pa= rent, > struct qstr *name); > +struct dentry *start_removing(struct mnt_idmap *idmap, struct dentry *pa= rent, > + struct qstr *name); > =20 > /** > * end_creating - finish action started with start_creating > @@ -122,6 +124,22 @@ static inline void end_creating(struct dentry *child= , struct dentry *parent) > end_dirop(child); > } > =20 > +/** > + * end_removing - finish action started with start_removing > + * @child: dentry returned by start_removing() > + * @parent: dentry given to start_removing() > + * > + * Unlock and release the child. > + * > + * This is identical to end_dirop(). It can be passed the result of > + * start_removing() whether that was successful or not, but it not neede= d > + * if start_removing() failed. > + */ > +static inline void end_removing(struct dentry *child) > +{ > + end_dirop(child); > +} > + > extern int follow_down_one(struct path *); > extern int follow_down(struct path *path, unsigned int flags); > extern int follow_up(struct path *); This looks fine to me (particularly the knfsd parts), but doesn't ksmbd need to be similarly converted? Reviewed-by: Jeff Layton