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 90E0942A99 for ; Thu, 2 Oct 2025 17:19:40 +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=1759425580; cv=none; b=sU6fpfREU/72NIeNbOQvHs+L4uW/0ZKvHxtjdmWkNIeEP+RlEEDK+XPbEF/Xhn1oWk0eXo5qIrlyLcj1OFbfUrnA7fERZMLw1fwEbl17CGfSHFhENfZU6n+CgvS9Hb6yYJqqEt3zUf5mZ9/3Nd/Gx6d/TKfNL50yQEPRo9zlL1A= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759425580; c=relaxed/simple; bh=2izIfzvcQfDpHeqmzjf5SqvCVpagOLOJKKSztKXGNrk=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=p+BhGtdHBpL8gTcDwcHjfTqgmrgpWV5rwrM/uJ2+zJNV6pV8JatPEKkLU1U5EKlfaW3u5Rwph5OEpcQfhgMnFCyg8QYpY5p8GeDh7xaXJp1YHrbXHPQ/pyQQNxqwx73wuQ7GAw8FHIu8+29w9V2YjR7f1SBgnhfly8qkV19zNO4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=RSBt77mY; 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="RSBt77mY" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9DE6AC4CEF5; Thu, 2 Oct 2025 17:19:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1759425580; bh=2izIfzvcQfDpHeqmzjf5SqvCVpagOLOJKKSztKXGNrk=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=RSBt77mYeSvAQcnOPKcTENQYPAp7xjqqlIVC13Va/DECz6BNZxAZSRbebqUlwJkAZ d6d/1zf2iS3j835udrispakTmtbERDXaQb9S4bI3k10J4+HfHqe8zT2B5vFRiwU4o2 n8NAky3eYRz9XrMxPfGtio7z79ku2CALCzuXISzjQ353xP4zC8JZTZrXs+sKXlNQ/z 8qrUolE4ZnzZjlSYVKwaHQ63Oowf8+SViE5T4q6OnZZyo/ggJHfdqOZN4SC2X4/Xy3 Zv9ZUW58+Kikj4tSC1GKSk8Ssbc6QvtQyZRqyD2QQ6L1o+08Lae7y/Giv/peH9fw9r mSOXi8lJofEdw== Message-ID: <71d455e2d378a7500b37101cb8c16576aea90198.camel@kernel.org> Subject: Re: [PATCH 06/11] VFS: introduce start_removing_dentry() From: Jeff Layton To: NeilBrown , Alexander Viro , Christian Brauner , Amir Goldstein Cc: Jan Kara , linux-fsdevel@vger.kernel.org Date: Thu, 02 Oct 2025 13:19:38 -0400 In-Reply-To: <20250926025015.1747294-7-neilb@ownmail.net> References: <20250926025015.1747294-1-neilb@ownmail.net> <20250926025015.1747294-7-neilb@ownmail.net> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV T2h6v8i8YqsATFPwO4nuiTmL6I40ZofxVd+9wdRI4Db8yUNA4ZSP2nqLcLtFjClYRBoJvRWvsv4lm 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2tAMJUvFTdDbfe3zKlPDTuVsyNsALBGclPLagJ5ZTP+Vp2irAN9uwBuacBOTtmOdz4ZN2tdvNgozz uxp4CHBDVzAslUi2idy+xpsp47DWPxYFIRP3M8QG/aNW052LaPc0cedYxp8+9eiVUNpxF4SiU4i9J 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 3.56.2 (3.56.2-2.fc42) Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Fri, 2025-09-26 at 12:49 +1000, NeilBrown wrote: > From: NeilBrown >=20 > start_removing_dentry() is similar to start_removing() but instead of > providing a name for lookup, the target dentry is given. >=20 > start_removing_dentry() checks that the dentry is still hashed and in > the parent, and if so it locks and increases the refcount so that > end_removing() can be used to finish the operation. >=20 > This is used in cachefiles, overlayfs, smb/server, and apparmor. >=20 > There will be other users including ecryptfs. >=20 > As start_removing_dentry() takes an extra reference to the dentry (to be > put by end_removing()), there is no need to explicitly take an extra > reference to stop d_delete() from using dentry_unlink_inode() to negate > the dentry - as in cachefiles_delete_object(), and ksmbd_vfs_unlink(). >=20 > Signed-off-by: NeilBrown > --- > fs/cachefiles/interface.c | 14 +++++++++----- > fs/cachefiles/namei.c | 22 ++++++++++++---------- > fs/cachefiles/volume.c | 10 +++++++--- > fs/namei.c | 29 +++++++++++++++++++++++++++++ > fs/overlayfs/dir.c | 10 ++++------ > fs/overlayfs/readdir.c | 8 ++++---- > fs/smb/server/vfs.c | 27 ++++----------------------- > include/linux/namei.h | 2 ++ > security/apparmor/apparmorfs.c | 8 ++++---- > 9 files changed, 75 insertions(+), 55 deletions(-) >=20 > diff --git a/fs/cachefiles/interface.c b/fs/cachefiles/interface.c > index 3e63cfe15874..3f8a6f1a8fc3 100644 > --- a/fs/cachefiles/interface.c > +++ b/fs/cachefiles/interface.c > @@ -9,6 +9,7 @@ > #include > #include > #include > +#include > #include > #include > #include "internal.h" > @@ -428,11 +429,14 @@ static bool cachefiles_invalidate_cookie(struct fsc= ache_cookie *cookie) > if (!old_tmpfile) { > struct cachefiles_volume *volume =3D object->volume; > struct dentry *fan =3D volume->fanout[(u8)cookie->key_hash]; > - > - inode_lock_nested(d_inode(fan), I_MUTEX_PARENT); > - cachefiles_bury_object(volume->cache, object, fan, > - old_file->f_path.dentry, > - FSCACHE_OBJECT_INVALIDATED); > + struct dentry *obj; > + > + obj =3D start_removing_dentry(fan, old_file->f_path.dentry); > + if (!IS_ERR(obj)) > + cachefiles_bury_object(volume->cache, object, > + fan, obj, > + FSCACHE_OBJECT_INVALIDATED); > + end_removing(obj); > } > fput(old_file); > } > diff --git a/fs/cachefiles/namei.c b/fs/cachefiles/namei.c > index 3064d439807b..80a3055d8ae5 100644 > --- a/fs/cachefiles/namei.c > +++ b/fs/cachefiles/namei.c > @@ -424,13 +424,12 @@ int cachefiles_delete_object(struct cachefiles_obje= ct *object, > =20 > _enter(",OBJ%x{%pD}", object->debug_id, object->file); > =20 > - /* Stop the dentry being negated if it's only pinned by a file struct. = */ > - dget(dentry); > - > - inode_lock_nested(d_backing_inode(fan), I_MUTEX_PARENT); > - ret =3D cachefiles_unlink(volume->cache, object, fan, dentry, why); > - inode_unlock(d_backing_inode(fan)); > - dput(dentry); > + dentry =3D start_removing_dentry(fan, dentry); > + if (IS_ERR(dentry)) > + ret =3D PTR_ERR(dentry); > + else > + ret =3D cachefiles_unlink(volume->cache, object, fan, dentry, why); > + end_removing(dentry); > return ret; > } > =20 > @@ -643,9 +642,12 @@ bool cachefiles_look_up_object(struct cachefiles_obj= ect *object) > =20 > if (!d_is_reg(dentry)) { > pr_err("%pd is not a file\n", dentry); > - inode_lock_nested(d_inode(fan), I_MUTEX_PARENT); > - ret =3D cachefiles_bury_object(volume->cache, object, fan, dentry, > - FSCACHE_OBJECT_IS_WEIRD); > + struct dentry *de =3D start_removing_dentry(fan, dentry); > + if (!IS_ERR(de)) > + ret =3D cachefiles_bury_object(volume->cache, object, > + fan, de, > + FSCACHE_OBJECT_IS_WEIRD); > + end_removing(de); > dput(dentry); > if (ret < 0) > return false; > diff --git a/fs/cachefiles/volume.c b/fs/cachefiles/volume.c > index 781aac4ef274..ddf95ff5daf0 100644 > --- a/fs/cachefiles/volume.c > +++ b/fs/cachefiles/volume.c > @@ -7,6 +7,7 @@ > =20 > #include > #include > +#include > #include "internal.h" > #include > =20 > @@ -58,9 +59,12 @@ void cachefiles_acquire_volume(struct fscache_volume *= vcookie) > if (ret < 0) { > if (ret !=3D -ESTALE) > goto error_dir; > - inode_lock_nested(d_inode(cache->store), I_MUTEX_PARENT); > - cachefiles_bury_object(cache, NULL, cache->store, vdentry, > - FSCACHE_VOLUME_IS_WEIRD); > + vdentry =3D start_removing_dentry(cache->store, vdentry); > + if (!IS_ERR(vdentry)) > + cachefiles_bury_object(cache, NULL, cache->store, > + vdentry, > + FSCACHE_VOLUME_IS_WEIRD); > + end_removing(vdentry); > cachefiles_put_directory(volume->dentry); > cond_resched(); > goto retry; > diff --git a/fs/namei.c b/fs/namei.c > index bd5c45801756..cb4d40af12ae 100644 > --- a/fs/namei.c > +++ b/fs/namei.c > @@ -3344,6 +3344,35 @@ struct dentry *start_removing_noperm(struct dentry= *parent, > } > EXPORT_SYMBOL(start_removing_noperm); > =20 > +/** > + * start_removing_dentry - prepare to remove a given dentry > + * @parent - directory from which dentry should be removed > + * @child - the dentry to be removed > + * > + * A lock is taken to protect the dentry again other dirops and > + * the validity of the dentry is checked: correct parent and still hashe= d. > + * > + * If the dentry is valid a reference is taken and returned. If not > + * an error is returned. > + * > + * end_removing() should be called when removal is complete, or aborted. > + * > + * Returns: the valid dentry, or an error. > + */ > +struct dentry *start_removing_dentry(struct dentry *parent, > + struct dentry *child) > +{ > + inode_lock_nested(parent->d_inode, I_MUTEX_PARENT); > + if (unlikely(IS_DEADDIR(parent->d_inode) || > + child->d_parent !=3D parent || > + d_unhashed(child))) { > + inode_unlock(parent->d_inode); > + return ERR_PTR(-EINVAL); > + } > + return dget(child); > +} > +EXPORT_SYMBOL(start_removing_dentry); > + > #ifdef CONFIG_UNIX98_PTYS > int path_pts(struct path *path) > { > diff --git a/fs/overlayfs/dir.c b/fs/overlayfs/dir.c > index c4057b4a050d..74b1ef5860a4 100644 > --- a/fs/overlayfs/dir.c > +++ b/fs/overlayfs/dir.c > @@ -47,14 +47,12 @@ static int ovl_cleanup_locked(struct ovl_fs *ofs, str= uct inode *wdir, > int ovl_cleanup(struct ovl_fs *ofs, struct dentry *workdir, > struct dentry *wdentry) > { > - int err; > - > - err =3D ovl_parent_lock(workdir, wdentry); > - if (err) > - return err; > + wdentry =3D start_removing_dentry(workdir, wdentry); > + if (IS_ERR(wdentry)) > + return PTR_ERR(wdentry); > =20 > ovl_cleanup_locked(ofs, workdir->d_inode, wdentry); > - ovl_parent_unlock(workdir); > + end_removing(wdentry); > =20 > return 0; > } > diff --git a/fs/overlayfs/readdir.c b/fs/overlayfs/readdir.c > index 15cb06fa0c9a..213ff42556e7 100644 > --- a/fs/overlayfs/readdir.c > +++ b/fs/overlayfs/readdir.c > @@ -1158,11 +1158,11 @@ int ovl_workdir_cleanup(struct ovl_fs *ofs, struc= t dentry *parent, > if (!d_is_dir(dentry) || level > 1) > return ovl_cleanup(ofs, parent, dentry); > =20 > - err =3D ovl_parent_lock(parent, dentry); > - if (err) > - return err; > + dentry =3D start_removing_dentry(parent, dentry); > + if (IS_ERR(dentry)) > + return PTR_ERR(dentry); > err =3D ovl_do_rmdir(ofs, parent->d_inode, dentry); > - ovl_parent_unlock(parent); > + end_removing(dentry); > if (err) { > struct path path =3D { .mnt =3D mnt, .dentry =3D dentry }; > =20 > diff --git a/fs/smb/server/vfs.c b/fs/smb/server/vfs.c > index 1cfa688904b2..56b755a05c4e 100644 > --- a/fs/smb/server/vfs.c > +++ b/fs/smb/server/vfs.c > @@ -48,24 +48,6 @@ static void ksmbd_vfs_inherit_owner(struct ksmbd_work = *work, > i_uid_write(inode, i_uid_read(parent_inode)); > } > =20 > -/** > - * ksmbd_vfs_lock_parent() - lock parent dentry if it is stable > - * @parent: parent dentry > - * @child: child dentry > - * > - * Returns: %0 on success, %-ENOENT if the parent dentry is not stable > - */ > -int ksmbd_vfs_lock_parent(struct dentry *parent, struct dentry *child) > -{ > - inode_lock_nested(d_inode(parent), I_MUTEX_PARENT); > - if (child->d_parent !=3D parent) { > - inode_unlock(d_inode(parent)); > - return -ENOENT; > - } > - > - return 0; > -} > - > static int ksmbd_vfs_path_lookup(struct ksmbd_share_config *share_conf, > char *pathname, unsigned int flags, > struct path *path, bool do_lock) > @@ -1083,18 +1065,17 @@ int ksmbd_vfs_unlink(struct file *filp) > return err; > =20 > dir =3D dget_parent(dentry); > - err =3D ksmbd_vfs_lock_parent(dir, dentry); > - if (err) > + dentry =3D start_removing_dentry(dir, dentry); > + err =3D PTR_ERR(dentry); > + if (IS_ERR(dentry)) > goto out; > - dget(dentry); > =20 > if (S_ISDIR(d_inode(dentry)->i_mode)) > err =3D vfs_rmdir(idmap, d_inode(dir), dentry); > else > err =3D vfs_unlink(idmap, d_inode(dir), dentry, NULL); > =20 > - dput(dentry); > - inode_unlock(d_inode(dir)); > + end_removing(dentry); > if (err) > ksmbd_debug(VFS, "failed to delete, err %d\n", err); > out: > diff --git a/include/linux/namei.h b/include/linux/namei.h > index 20a88a46fe92..32a007f1043e 100644 > --- a/include/linux/namei.h > +++ b/include/linux/namei.h > @@ -94,6 +94,8 @@ struct dentry *start_removing(struct mnt_idmap *idmap, = struct dentry *parent, > struct qstr *name); > struct dentry *start_creating_noperm(struct dentry *parent, struct qstr = *name); > struct dentry *start_removing_noperm(struct dentry *parent, struct qstr = *name); > +struct dentry *start_removing_dentry(struct dentry *parent, > + struct dentry *child); > =20 > /* end_creating - finish action started with start_creating > * @child - dentry returned by start_creating() > diff --git a/security/apparmor/apparmorfs.c b/security/apparmor/apparmorf= s.c > index 391a586d0557..9d08d103f142 100644 > --- a/security/apparmor/apparmorfs.c > +++ b/security/apparmor/apparmorfs.c > @@ -355,17 +355,17 @@ static void aafs_remove(struct dentry *dentry) > if (!dentry || IS_ERR(dentry)) > return; > =20 > + /* ->d_parent is stable as rename is not supported */ > dir =3D d_inode(dentry->d_parent); > - inode_lock(dir); > - if (simple_positive(dentry)) { > + dentry =3D start_removing_dentry(dentry->d_parent, dentry); > + if (!IS_ERR(dentry) && simple_positive(dentry)) { > if (d_is_dir(dentry)) > simple_rmdir(dir, dentry); > else > simple_unlink(dir, dentry); > d_delete(dentry); > - dput(dentry); > } > - inode_unlock(dir); > + end_removing(dentry); > simple_release_fs(&aafs_mnt, &aafs_count); > } > =20 Reviewed-by: Jeff Layton