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 7CA0B30C359; Mon, 13 Oct 2025 14:48:33 +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=1760366913; cv=none; b=K6aOc6CqGCLJqUGVmakbn8A9K/oxn+GRMJiJlq262Ya2dc+R7EmXZWc4sy/kWouUNiEhHpYfbxPutPCENSjBTBrrdIFtTvJ7zlp7gJogyHNmsbxa7v9nqLI9Rsal5RiinMF/H3yvEn/WbsUKswS81mRwv6BmT39RRRFtbqXwqvA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760366913; c=relaxed/simple; bh=DITGPrxEBGAinDQ3TL6Rppcs0FME3zPsDBnrTn3EUy4=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=P1+QB4dU2CChlSeUqFWH9/d2QlHZpTJv+aLjYZDjfql9A/Fmy6Cczvb0OgTpUCqiuXJXVm9e+gFjLRFkaRI81gIGCrrl41tL/Zdq/oZ4ZMsKQJ6zigbm88yuUPH0FtfQpvRS0Bx+TmAdDAe8a/HG0AJ2pQ9Nh0qzzsNCHi4htKc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=IS/StRB3; 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="IS/StRB3" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 10340C116C6; Mon, 13 Oct 2025 14:48:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1760366913; bh=DITGPrxEBGAinDQ3TL6Rppcs0FME3zPsDBnrTn3EUy4=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=IS/StRB3uf3LkuWonVlYHleo/jFvFc40D9WU7clk7Pz0X1tTeuDbez9kXQ7E4TLRH z9MFABe2XcToTAOocY5Onl1Cr+fO2LRSBWChGe24TmZeOw1Sl25Zqvq36KfuqZUilQ quVH9QdcXyzKJxronabI7m6/GlOJhorcKF3wwyueMOD7zT9QgsyLMVK7sVKwKWs2td ZBvNkN6RKSm7wSd5QR8sf/OBDsLdtGvMqTYS/iwnKF6BdQ/+T7o8Kfl1/fCcGH/rP3 9mjKCcO2GcoIzgXRsHTofCIfNQ8PUrXW+pbQdd5EQPkhkAawO+06UnJofcBgQ8IXZI TFJkZ8Fbd+FLg== From: Jeff Layton Date: Mon, 13 Oct 2025 10:48:03 -0400 Subject: [PATCH 05/13] vfs: allow rmdir to wait for delegation break on parent Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20251013-dir-deleg-ro-v1-5-406780a70e5e@kernel.org> References: <20251013-dir-deleg-ro-v1-0-406780a70e5e@kernel.org> In-Reply-To: <20251013-dir-deleg-ro-v1-0-406780a70e5e@kernel.org> To: Miklos Szeredi , Alexander Viro , Christian Brauner , Jan Kara , Chuck Lever , Alexander Aring , Trond Myklebust , Anna Schumaker , Steve French , Paulo Alcantara , Ronnie Sahlberg , Shyam Prasad N , Tom Talpey , Bharath SM , Greg Kroah-Hartman , "Rafael J. Wysocki" , Danilo Krummrich , David Howells , Tyler Hicks , NeilBrown , Olga Kornievskaia , Dai Ngo , Amir Goldstein , Namjae Jeon , Steve French , Sergey Senozhatsky , Carlos Maiolino , Kuniyuki Iwashima , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org, linux-cifs@vger.kernel.org, samba-technical@lists.samba.org, netfs@lists.linux.dev, ecryptfs@vger.kernel.org, linux-unionfs@vger.kernel.org, linux-xfs@vger.kernel.org, netdev@vger.kernel.org, Jeff Layton X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=7725; i=jlayton@kernel.org; h=from:subject:message-id; bh=DITGPrxEBGAinDQ3TL6Rppcs0FME3zPsDBnrTn3EUy4=; b=owEBbQKS/ZANAwAKAQAOaEEZVoIVAcsmYgBo7REq854sH4iRL/T5lLpLqiJcggYKnYHFoOnT7 QNLoC+73j2JAjMEAAEKAB0WIQRLwNeyRHGyoYTq9dMADmhBGVaCFQUCaO0RKgAKCRAADmhBGVaC FWOzEACbENpKkY5gRUbZMoj8qqO/1fn2VosFr0GDO4v/4pupam4MegfP7drN0pky7+U7+LGXXhB Cu3xo/4FZ5cTUVHvrfbYRyl4DLtV7egx/gqYT9WtZp+wvtiXUAFCSd0BiGx4NRAqcIvqLp9+FT3 1o32KTBhSlLYJKqBb3zb1iR70CUyfR3FlXHwwZeENZECLHnNmFl7225V62pqTSXkYwf2Kdv+TAN ZeqN2abaRTZRNH36xr6UVSVppesWrmC/0Nbr3DNrpm/pA6tMULOG7TsNSF3iyUnAjuQgh+RcLCT 9IjOf8PmOVd0ZOSp9lCcp6UwGG/MT3iI11+8EP3WmxHi8oFrlUPoKUN69VvRUR3/Ket86Lq2hHY EWlTIGcoEddpuhsGaznzQbha+zShVTG6NOjHXjKTnXQTUCjuPPkpR5VRu/WWneDBMWKABsJZ8l+ +bUz/B2L7iP6pO8pIruEtBJAT0RB3zRvew18zZjkSmurnYQy+Oaiv0fTg1493xHDairrAJFeEni 4M8QkkIgglTcv9PqiyF0c4FGRi4MUTIZlrJkoyZtCJVGkt25YcnVlkiBhfXoiOr9IDeL5wV71xo ir7ixDycgH/aowbEP1J29AfGbsbmHIwiWsgTCWRqu+xoYORDSWNhGJmb9Su+h4bSeGYoNQaFG7O XMWRcXcV9DGCjUQ== X-Developer-Key: i=jlayton@kernel.org; a=openpgp; fpr=4BC0D7B24471B2A184EAF5D3000E684119568215 In order to add directory delegation support, we need to break delegations on the parent whenever there is going to be a change in the directory. Add a "delegated_inode" return pointer to vfs_rmdir() and populate that pointer with the parent inode if it's non-NULL. Most existing in-kernel callers pass in a NULL pointer. Signed-off-by: Jeff Layton --- drivers/base/devtmpfs.c | 2 +- fs/ecryptfs/inode.c | 2 +- fs/namei.c | 22 +++++++++++++++++----- fs/nfsd/nfs4recover.c | 4 ++-- fs/nfsd/vfs.c | 2 +- fs/overlayfs/overlayfs.h | 2 +- fs/smb/server/vfs.c | 4 ++-- include/linux/fs.h | 3 ++- 8 files changed, 27 insertions(+), 14 deletions(-) diff --git a/drivers/base/devtmpfs.c b/drivers/base/devtmpfs.c index 0e79621cb0f79870003b867ca384199171ded4e0..104025104ef75381984fd94dfbd50feeaa8cdd22 100644 --- a/drivers/base/devtmpfs.c +++ b/drivers/base/devtmpfs.c @@ -261,7 +261,7 @@ static int dev_rmdir(const char *name) return PTR_ERR(dentry); if (d_inode(dentry)->i_private == &thread) err = vfs_rmdir(&nop_mnt_idmap, d_inode(parent.dentry), - dentry); + dentry, NULL); else err = -EPERM; diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c index 35830b3144f8f71374a78b3e7463b864f4fc216e..88631291b32535f623a3fbe4ea9b6ed48a306ca0 100644 --- a/fs/ecryptfs/inode.c +++ b/fs/ecryptfs/inode.c @@ -540,7 +540,7 @@ static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) if (d_unhashed(lower_dentry)) rc = -EINVAL; else - rc = vfs_rmdir(&nop_mnt_idmap, lower_dir, lower_dentry); + rc = vfs_rmdir(&nop_mnt_idmap, lower_dir, lower_dentry, NULL); } if (!rc) { clear_nlink(d_inode(dentry)); diff --git a/fs/namei.c b/fs/namei.c index 86cf6eca1f485361c6732974e4103cf5ea721539..4b5a99653c558397e592715d9d4663cd4a63ef86 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -4522,9 +4522,10 @@ SYSCALL_DEFINE2(mkdir, const char __user *, pathname, umode_t, mode) /** * vfs_rmdir - remove directory - * @idmap: idmap of the mount the inode was found from - * @dir: inode of the parent directory - * @dentry: dentry of the child directory + * @idmap: idmap of the mount the inode was found from + * @dir: inode of the parent directory + * @dentry: dentry of the child directory + * @delegated_inode: returns parent inode, if it's delegated. * * Remove a directory. * @@ -4535,7 +4536,7 @@ SYSCALL_DEFINE2(mkdir, const char __user *, pathname, umode_t, mode) * raw inode simply pass @nop_mnt_idmap. */ int vfs_rmdir(struct mnt_idmap *idmap, struct inode *dir, - struct dentry *dentry) + struct dentry *dentry, struct inode **delegated_inode) { int error = may_delete(idmap, dir, dentry, 1); @@ -4557,6 +4558,10 @@ int vfs_rmdir(struct mnt_idmap *idmap, struct inode *dir, if (error) goto out; + error = try_break_deleg(dir, delegated_inode); + if (error) + goto out; + error = dir->i_op->rmdir(dir, dentry); if (error) goto out; @@ -4583,6 +4588,7 @@ int do_rmdir(int dfd, struct filename *name) struct qstr last; int type; unsigned int lookup_flags = 0; + struct inode *delegated_inode = NULL; retry: error = filename_parentat(dfd, name, lookup_flags, &path, &last, &type); if (error) @@ -4612,7 +4618,8 @@ int do_rmdir(int dfd, struct filename *name) error = security_path_rmdir(&path, dentry); if (error) goto exit4; - error = vfs_rmdir(mnt_idmap(path.mnt), path.dentry->d_inode, dentry); + error = vfs_rmdir(mnt_idmap(path.mnt), path.dentry->d_inode, + dentry, &delegated_inode); exit4: dput(dentry); exit3: @@ -4620,6 +4627,11 @@ int do_rmdir(int dfd, struct filename *name) mnt_drop_write(path.mnt); exit2: path_put(&path); + if (delegated_inode) { + error = break_deleg_wait(&delegated_inode); + if (!error) + goto retry; + } if (retry_estale(error, lookup_flags)) { lookup_flags |= LOOKUP_REVAL; goto retry; diff --git a/fs/nfsd/nfs4recover.c b/fs/nfsd/nfs4recover.c index 3dfbb85c9a1166b56e56eb9f1d6bfd140584730b..ad3acbb956d90cac88f74e5f598719af6f1f8328 100644 --- a/fs/nfsd/nfs4recover.c +++ b/fs/nfsd/nfs4recover.c @@ -275,7 +275,7 @@ nfsd4_unlink_clid_dir(char *name, struct nfsd_net *nn) status = -ENOENT; if (d_really_is_negative(dentry)) goto out; - status = vfs_rmdir(&nop_mnt_idmap, d_inode(dir), dentry); + status = vfs_rmdir(&nop_mnt_idmap, d_inode(dir), dentry, NULL); out: dput(dentry); out_unlock: @@ -367,7 +367,7 @@ purge_old(struct dentry *parent, char *cname, struct nfsd_net *nn) inode_lock_nested(d_inode(parent), I_MUTEX_PARENT); child = lookup_one(&nop_mnt_idmap, &QSTR(cname), parent); if (!IS_ERR(child)) { - status = vfs_rmdir(&nop_mnt_idmap, d_inode(parent), child); + status = vfs_rmdir(&nop_mnt_idmap, d_inode(parent), child, NULL); if (status) printk("failed to remove client recovery directory %pd\n", child); diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c index 447f5ab8e0b92288c9f220060ab15f32f2a84de9..7d8cd2595f197be9741ee6320d43ed6651896647 100644 --- a/fs/nfsd/vfs.c +++ b/fs/nfsd/vfs.c @@ -2194,7 +2194,7 @@ nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, break; } } else { - host_err = vfs_rmdir(&nop_mnt_idmap, dirp, rdentry); + host_err = vfs_rmdir(&nop_mnt_idmap, dirp, rdentry, NULL); } fh_fill_post_attrs(fhp); diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h index 0f65f9a5d54d4786b39e4f4f30f416d5b9016e70..d215d7349489686b66bb66e939b27046f7d836f6 100644 --- a/fs/overlayfs/overlayfs.h +++ b/fs/overlayfs/overlayfs.h @@ -206,7 +206,7 @@ static inline int ovl_do_notify_change(struct ovl_fs *ofs, static inline int ovl_do_rmdir(struct ovl_fs *ofs, struct inode *dir, struct dentry *dentry) { - int err = vfs_rmdir(ovl_upper_mnt_idmap(ofs), dir, dentry); + int err = vfs_rmdir(ovl_upper_mnt_idmap(ofs), dir, dentry, NULL); pr_debug("rmdir(%pd2) = %i\n", dentry, err); return err; diff --git a/fs/smb/server/vfs.c b/fs/smb/server/vfs.c index 3d2190f26623b23ea79c63410905a3c3ad684048..c5f0f3170d586cb2dc4d416b80948c642797fb82 100644 --- a/fs/smb/server/vfs.c +++ b/fs/smb/server/vfs.c @@ -609,7 +609,7 @@ int ksmbd_vfs_remove_file(struct ksmbd_work *work, const struct path *path) idmap = mnt_idmap(path->mnt); if (S_ISDIR(d_inode(path->dentry)->i_mode)) { - err = vfs_rmdir(idmap, d_inode(parent), path->dentry); + err = vfs_rmdir(idmap, d_inode(parent), path->dentry, NULL); if (err && err != -ENOTEMPTY) ksmbd_debug(VFS, "rmdir failed, err %d\n", err); } else { @@ -1090,7 +1090,7 @@ int ksmbd_vfs_unlink(struct file *filp) dget(dentry); if (S_ISDIR(d_inode(dentry)->i_mode)) - err = vfs_rmdir(idmap, d_inode(dir), dentry); + err = vfs_rmdir(idmap, d_inode(dir), dentry, NULL); else err = vfs_unlink(idmap, d_inode(dir), dentry, NULL); diff --git a/include/linux/fs.h b/include/linux/fs.h index 1040df3792794cd353b86558b41618294e25b8a6..d8bdaf7c87502ff17775602f5391d375738b4ed8 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -2120,7 +2120,8 @@ int vfs_symlink(struct mnt_idmap *, struct inode *, struct dentry *, const char *); int vfs_link(struct dentry *, struct mnt_idmap *, struct inode *, struct dentry *, struct inode **); -int vfs_rmdir(struct mnt_idmap *, struct inode *, struct dentry *); +int vfs_rmdir(struct mnt_idmap *, struct inode *, struct dentry *, + struct inode **); int vfs_unlink(struct mnt_idmap *, struct inode *, struct dentry *, struct inode **); -- 2.51.0