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From: Jan Kara <jack@suse.cz>
To: Jeff Layton <jlayton@kernel.org>
Cc: Miklos Szeredi <miklos@szeredi.hu>,
	 Alexander Viro <viro@zeniv.linux.org.uk>,
	Christian Brauner <brauner@kernel.org>, Jan Kara <jack@suse.cz>,
	 Chuck Lever <chuck.lever@oracle.com>,
	Alexander Aring <alex.aring@gmail.com>,
	 Trond Myklebust <trondmy@kernel.org>,
	Anna Schumaker <anna@kernel.org>,
	 Steve French <sfrench@samba.org>,
	Paulo Alcantara <pc@manguebit.org>,
	 Ronnie Sahlberg <ronniesahlberg@gmail.com>,
	Shyam Prasad N <sprasad@microsoft.com>,
	 Tom Talpey <tom@talpey.com>,
	Bharath SM <bharathsm@microsoft.com>,
	 Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	"Rafael J. Wysocki" <rafael@kernel.org>,
	 Danilo Krummrich <dakr@kernel.org>,
	David Howells <dhowells@redhat.com>,
	 Tyler Hicks <code@tyhicks.com>, NeilBrown <neil@brown.name>,
	 Olga Kornievskaia <okorniev@redhat.com>,
	Dai Ngo <Dai.Ngo@oracle.com>,
	 Amir Goldstein <amir73il@gmail.com>,
	Namjae Jeon <linkinjeon@kernel.org>,
	 Steve French <smfrench@gmail.com>,
	Sergey Senozhatsky <senozhatsky@chromium.org>,
	 Carlos Maiolino <cem@kernel.org>,
	Kuniyuki Iwashima <kuniyu@google.com>,
	 "David S. Miller" <davem@davemloft.net>,
	Eric Dumazet <edumazet@google.com>,
	 Jakub Kicinski <kuba@kernel.org>,
	Paolo Abeni <pabeni@redhat.com>, Simon Horman <horms@kernel.org>,
	 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
Subject: Re: [PATCH 04/13] vfs: allow mkdir to wait for delegation break on parent
Date: Mon, 20 Oct 2025 11:38:20 +0200	[thread overview]
Message-ID: <wfsice3qjgzmfeibyuonhlur2sef65psoitir2irkfapekjdid@3egphok6hmaa> (raw)
In-Reply-To: <20251013-dir-deleg-ro-v1-4-406780a70e5e@kernel.org>

On Mon 13-10-25 10:48:02, Jeff Layton wrote:
> 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 new delegated_inode parameter to vfs_mkdir. All of the existing
> callers set that to NULL for now, except for do_mkdirat which will
> properly block until the lease is gone.
> 
> Signed-off-by: Jeff Layton <jlayton@kernel.org>

Looks good. Feel free to add:

Reviewed-by: Jan Kara <jack@suse.cz>

								Honza

> ---
>  drivers/base/devtmpfs.c  |  2 +-
>  fs/cachefiles/namei.c    |  2 +-
>  fs/ecryptfs/inode.c      |  2 +-
>  fs/init.c                |  2 +-
>  fs/namei.c               | 24 ++++++++++++++++++------
>  fs/nfsd/nfs4recover.c    |  2 +-
>  fs/nfsd/vfs.c            |  2 +-
>  fs/overlayfs/overlayfs.h |  2 +-
>  fs/smb/server/vfs.c      |  2 +-
>  fs/xfs/scrub/orphanage.c |  2 +-
>  include/linux/fs.h       |  2 +-
>  11 files changed, 28 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/base/devtmpfs.c b/drivers/base/devtmpfs.c
> index 9d4e46ad8352257a6a65d85526ebdbf9bf2d4b19..0e79621cb0f79870003b867ca384199171ded4e0 100644
> --- a/drivers/base/devtmpfs.c
> +++ b/drivers/base/devtmpfs.c
> @@ -180,7 +180,7 @@ static int dev_mkdir(const char *name, umode_t mode)
>  	if (IS_ERR(dentry))
>  		return PTR_ERR(dentry);
>  
> -	dentry = vfs_mkdir(&nop_mnt_idmap, d_inode(path.dentry), dentry, mode);
> +	dentry = vfs_mkdir(&nop_mnt_idmap, d_inode(path.dentry), dentry, mode, NULL);
>  	if (!IS_ERR(dentry))
>  		/* mark as kernel-created inode */
>  		d_inode(dentry)->i_private = &thread;
> diff --git a/fs/cachefiles/namei.c b/fs/cachefiles/namei.c
> index d1edb2ac38376c4f9d2a18026450bb3c774f7824..50c0f9c76d1fd4c05db90d7d0d1bad574523ead0 100644
> --- a/fs/cachefiles/namei.c
> +++ b/fs/cachefiles/namei.c
> @@ -130,7 +130,7 @@ struct dentry *cachefiles_get_directory(struct cachefiles_cache *cache,
>  			goto mkdir_error;
>  		ret = cachefiles_inject_write_error();
>  		if (ret == 0)
> -			subdir = vfs_mkdir(&nop_mnt_idmap, d_inode(dir), subdir, 0700);
> +			subdir = vfs_mkdir(&nop_mnt_idmap, d_inode(dir), subdir, 0700, NULL);
>  		else
>  			subdir = ERR_PTR(ret);
>  		if (IS_ERR(subdir)) {
> diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c
> index ed1394da8d6bd7065f2a074378331f13fcda17f9..35830b3144f8f71374a78b3e7463b864f4fc216e 100644
> --- a/fs/ecryptfs/inode.c
> +++ b/fs/ecryptfs/inode.c
> @@ -508,7 +508,7 @@ static struct dentry *ecryptfs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
>  		goto out;
>  
>  	lower_dentry = vfs_mkdir(&nop_mnt_idmap, lower_dir,
> -				 lower_dentry, mode);
> +				 lower_dentry, mode, NULL);
>  	rc = PTR_ERR(lower_dentry);
>  	if (IS_ERR(lower_dentry))
>  		goto out;
> diff --git a/fs/init.c b/fs/init.c
> index 07f592ccdba868509d0f3aaf9936d8d890fdbec5..895f8a09a71acfd03e11164e3b441a7d4e2de146 100644
> --- a/fs/init.c
> +++ b/fs/init.c
> @@ -233,7 +233,7 @@ int __init init_mkdir(const char *pathname, umode_t mode)
>  	error = security_path_mkdir(&path, dentry, mode);
>  	if (!error) {
>  		dentry = vfs_mkdir(mnt_idmap(path.mnt), path.dentry->d_inode,
> -				  dentry, mode);
> +				  dentry, mode, NULL);
>  		if (IS_ERR(dentry))
>  			error = PTR_ERR(dentry);
>  	}
> diff --git a/fs/namei.c b/fs/namei.c
> index 6e61e0215b34134b1690f864e2719e3f82cf71a8..86cf6eca1f485361c6732974e4103cf5ea721539 100644
> --- a/fs/namei.c
> +++ b/fs/namei.c
> @@ -4407,10 +4407,11 @@ SYSCALL_DEFINE3(mknod, const char __user *, filename, umode_t, mode, unsigned, d
>  
>  /**
>   * vfs_mkdir - create directory returning correct dentry if possible
> - * @idmap:	idmap of the mount the inode was found from
> - * @dir:	inode of the parent directory
> - * @dentry:	dentry of the child directory
> - * @mode:	mode 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
> + * @mode:		mode of the child directory
> + * @delegated_inode:	returns parent inode, if the inode is delegated.
>   *
>   * Create a directory.
>   *
> @@ -4427,7 +4428,8 @@ SYSCALL_DEFINE3(mknod, const char __user *, filename, umode_t, mode, unsigned, d
>   * In case of an error the dentry is dput() and an ERR_PTR() is returned.
>   */
>  struct dentry *vfs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
> -			 struct dentry *dentry, umode_t mode)
> +			 struct dentry *dentry, umode_t mode,
> +			 struct inode **delegated_inode)
>  {
>  	int error;
>  	unsigned max_links = dir->i_sb->s_max_links;
> @@ -4450,6 +4452,10 @@ struct dentry *vfs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
>  	if (max_links && dir->i_nlink >= max_links)
>  		goto err;
>  
> +	error = try_break_deleg(dir, delegated_inode);
> +	if (error)
> +		goto err;
> +
>  	de = dir->i_op->mkdir(idmap, dir, dentry, mode);
>  	error = PTR_ERR(de);
>  	if (IS_ERR(de))
> @@ -4473,6 +4479,7 @@ int do_mkdirat(int dfd, struct filename *name, umode_t mode)
>  	struct path path;
>  	int error;
>  	unsigned int lookup_flags = LOOKUP_DIRECTORY;
> +	struct inode *delegated_inode = NULL;
>  
>  retry:
>  	dentry = filename_create(dfd, name, &path, lookup_flags);
> @@ -4484,11 +4491,16 @@ int do_mkdirat(int dfd, struct filename *name, umode_t mode)
>  			mode_strip_umask(path.dentry->d_inode, mode));
>  	if (!error) {
>  		dentry = vfs_mkdir(mnt_idmap(path.mnt), path.dentry->d_inode,
> -				  dentry, mode);
> +				   dentry, mode, &delegated_inode);
>  		if (IS_ERR(dentry))
>  			error = PTR_ERR(dentry);
>  	}
>  	end_creating_path(&path, dentry);
> +	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 c41bb85e06822a82c86e2a33bd9a91e978c75965..3dfbb85c9a1166b56e56eb9f1d6bfd140584730b 100644
> --- a/fs/nfsd/nfs4recover.c
> +++ b/fs/nfsd/nfs4recover.c
> @@ -162,7 +162,7 @@ nfsd4_create_clid_dir(struct nfs4_client *clp)
>  		 * as well be forgiving and just succeed silently.
>  		 */
>  		goto out_put;
> -	dentry = vfs_mkdir(&nop_mnt_idmap, d_inode(dir), dentry, S_IRWXU);
> +	dentry = vfs_mkdir(&nop_mnt_idmap, d_inode(dir), dentry, 0700, NULL);
>  	if (IS_ERR(dentry))
>  		status = PTR_ERR(dentry);
>  out_put:
> diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
> index f537a7b4ee01f49cfb864df9a92a9660b743a51e..447f5ab8e0b92288c9f220060ab15f32f2a84de9 100644
> --- a/fs/nfsd/vfs.c
> +++ b/fs/nfsd/vfs.c
> @@ -1644,7 +1644,7 @@ nfsd_create_locked(struct svc_rqst *rqstp, struct svc_fh *fhp,
>  			nfsd_check_ignore_resizing(iap);
>  		break;
>  	case S_IFDIR:
> -		dchild = vfs_mkdir(&nop_mnt_idmap, dirp, dchild, iap->ia_mode);
> +		dchild = vfs_mkdir(&nop_mnt_idmap, dirp, dchild, iap->ia_mode, NULL);
>  		if (IS_ERR(dchild)) {
>  			host_err = PTR_ERR(dchild);
>  		} else if (d_is_negative(dchild)) {
> diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h
> index c8fd5951fc5ece1ae6b3e2a0801ca15f9faf7d72..0f65f9a5d54d4786b39e4f4f30f416d5b9016e70 100644
> --- a/fs/overlayfs/overlayfs.h
> +++ b/fs/overlayfs/overlayfs.h
> @@ -248,7 +248,7 @@ static inline struct dentry *ovl_do_mkdir(struct ovl_fs *ofs,
>  {
>  	struct dentry *ret;
>  
> -	ret = vfs_mkdir(ovl_upper_mnt_idmap(ofs), dir, dentry, mode);
> +	ret = vfs_mkdir(ovl_upper_mnt_idmap(ofs), dir, dentry, mode, NULL);
>  	pr_debug("mkdir(%pd2, 0%o) = %i\n", dentry, mode, PTR_ERR_OR_ZERO(ret));
>  	return ret;
>  }
> diff --git a/fs/smb/server/vfs.c b/fs/smb/server/vfs.c
> index 891ed2dc2b7351a5cb14a2241d71095ffdd03f08..3d2190f26623b23ea79c63410905a3c3ad684048 100644
> --- a/fs/smb/server/vfs.c
> +++ b/fs/smb/server/vfs.c
> @@ -230,7 +230,7 @@ int ksmbd_vfs_mkdir(struct ksmbd_work *work, const char *name, umode_t mode)
>  	idmap = mnt_idmap(path.mnt);
>  	mode |= S_IFDIR;
>  	d = dentry;
> -	dentry = vfs_mkdir(idmap, d_inode(path.dentry), dentry, mode);
> +	dentry = vfs_mkdir(idmap, d_inode(path.dentry), dentry, mode, NULL);
>  	if (IS_ERR(dentry))
>  		err = PTR_ERR(dentry);
>  	else if (d_is_negative(dentry))
> diff --git a/fs/xfs/scrub/orphanage.c b/fs/xfs/scrub/orphanage.c
> index 9c12cb8442311ca26b169e4d1567939ae44a5be0..91c9d07b97f306f57aebb9b69ba564b0c2cb8c17 100644
> --- a/fs/xfs/scrub/orphanage.c
> +++ b/fs/xfs/scrub/orphanage.c
> @@ -167,7 +167,7 @@ xrep_orphanage_create(
>  	 */
>  	if (d_really_is_negative(orphanage_dentry)) {
>  		orphanage_dentry = vfs_mkdir(&nop_mnt_idmap, root_inode,
> -					     orphanage_dentry, 0750);
> +					     orphanage_dentry, 0750, NULL);
>  		error = PTR_ERR(orphanage_dentry);
>  		if (IS_ERR(orphanage_dentry))
>  			goto out_unlock_root;
> diff --git a/include/linux/fs.h b/include/linux/fs.h
> index c895146c1444be36e0a779df55622cc38c9419ff..1040df3792794cd353b86558b41618294e25b8a6 100644
> --- a/include/linux/fs.h
> +++ b/include/linux/fs.h
> @@ -2113,7 +2113,7 @@ bool inode_owner_or_capable(struct mnt_idmap *idmap,
>  int vfs_create(struct mnt_idmap *, struct inode *,
>  	       struct dentry *, umode_t, bool);
>  struct dentry *vfs_mkdir(struct mnt_idmap *, struct inode *,
> -			 struct dentry *, umode_t);
> +			 struct dentry *, umode_t, struct inode **);
>  int vfs_mknod(struct mnt_idmap *, struct inode *, struct dentry *,
>                umode_t, dev_t);
>  int vfs_symlink(struct mnt_idmap *, struct inode *,
> 
> -- 
> 2.51.0
> 
-- 
Jan Kara <jack@suse.com>
SUSE Labs, CR

  reply	other threads:[~2025-10-20  9:38 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-10-13 14:47 [PATCH 00/13] vfs: recall-only directory delegations for knfsd Jeff Layton
2025-10-13 14:47 ` [PATCH 01/13] filelock: push the S_ISREG check down to ->setlease handlers Jeff Layton
2025-10-14  5:37   ` NeilBrown
2025-10-14 11:07     ` Jeff Layton
2025-10-13 14:48 ` [PATCH 02/13] filelock: add a lm_may_setlease lease_manager callback Jeff Layton
2025-10-14  5:34   ` NeilBrown
2025-10-14 11:10     ` Jeff Layton
2025-10-14 22:10       ` NeilBrown
2025-10-15 11:35         ` Jeff Layton
2025-10-13 14:48 ` [PATCH 03/13] vfs: add try_break_deleg calls for parents to vfs_{link,rename,unlink} Jeff Layton
2025-10-20  9:38   ` Jan Kara
2025-10-13 14:48 ` [PATCH 04/13] vfs: allow mkdir to wait for delegation break on parent Jeff Layton
2025-10-20  9:38   ` Jan Kara [this message]
2025-10-13 14:48 ` [PATCH 05/13] vfs: allow rmdir " Jeff Layton
2025-10-20  9:38   ` Jan Kara
2025-10-13 14:48 ` [PATCH 06/13] vfs: break parent dir delegations in open(..., O_CREAT) codepath Jeff Layton
2025-10-20  9:38   ` Jan Kara
2025-10-13 14:48 ` [PATCH 07/13] vfs: make vfs_create break delegations on parent directory Jeff Layton
2025-10-13 20:33   ` Jeff Layton
2025-10-20  9:38   ` Jan Kara
2025-10-13 14:48 ` [PATCH 08/13] vfs: make vfs_mknod " Jeff Layton
2025-10-20  9:38   ` Jan Kara
2025-10-13 14:48 ` [PATCH 09/13] filelock: lift the ban on directory leases in generic_setlease Jeff Layton
2025-10-13 14:48 ` [PATCH 10/13] nfsd: allow filecache to hold S_IFDIR files Jeff Layton
2025-10-14  5:45   ` NeilBrown
2025-10-13 14:48 ` [PATCH 11/13] nfsd: allow DELEGRETURN on directories Jeff Layton
2025-10-13 14:48 ` [PATCH 12/13] nfsd: check for delegation conflicts vs. the same client Jeff Layton
2025-10-14  5:48   ` NeilBrown
2025-10-13 14:48 ` [PATCH 13/13] nfsd: wire up GET_DIR_DELEGATION handling Jeff Layton
2025-10-13 14:52 ` [PATCH 00/13] vfs: recall-only directory delegations for knfsd Chuck Lever
2025-10-13 15:26   ` Jeff Layton

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