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 08/13] vfs: make vfs_mknod break delegations on parent directory
Date: Mon, 20 Oct 2025 11:38:41 +0200 [thread overview]
Message-ID: <vuf6ypnlwgo6edemvtdhx3cpoufpr2iojbzqd4urocqjuoxj76@v7xwlpwnn77a> (raw)
In-Reply-To: <20251013-dir-deleg-ro-v1-8-406780a70e5e@kernel.org>
On Mon 13-10-25 10:48:06, 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 return pointer to vfs_mknod() and have the
> appropriate callers wait when there is an outstanding delegation. All
> other callers just set the pointer to NULL.
>
> 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/ecryptfs/inode.c | 2 +-
> fs/init.c | 2 +-
> fs/namei.c | 25 +++++++++++++++++--------
> fs/nfsd/vfs.c | 2 +-
> fs/overlayfs/overlayfs.h | 2 +-
> include/linux/fs.h | 4 ++--
> net/unix/af_unix.c | 2 +-
> 8 files changed, 25 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/base/devtmpfs.c b/drivers/base/devtmpfs.c
> index 104025104ef75381984fd94dfbd50feeaa8cdd22..2f576ecf18324f767cd5ac6cbd28adbf9f46b958 100644
> --- a/drivers/base/devtmpfs.c
> +++ b/drivers/base/devtmpfs.c
> @@ -231,7 +231,7 @@ static int handle_create(const char *nodename, umode_t mode, kuid_t uid,
> return PTR_ERR(dentry);
>
> err = vfs_mknod(&nop_mnt_idmap, d_inode(path.dentry), dentry, mode,
> - dev->devt);
> + dev->devt, NULL);
> if (!err) {
> struct iattr newattrs;
>
> diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c
> index 88631291b32535f623a3fbe4ea9b6ed48a306ca0..acef6d921167268d4590c688894d4522016db0dd 100644
> --- a/fs/ecryptfs/inode.c
> +++ b/fs/ecryptfs/inode.c
> @@ -565,7 +565,7 @@ ecryptfs_mknod(struct mnt_idmap *idmap, struct inode *dir,
> rc = lock_parent(dentry, &lower_dentry, &lower_dir);
> if (!rc)
> rc = vfs_mknod(&nop_mnt_idmap, lower_dir,
> - lower_dentry, mode, dev);
> + lower_dentry, mode, dev, NULL);
> if (rc || d_really_is_negative(lower_dentry))
> goto out;
> rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
> diff --git a/fs/init.c b/fs/init.c
> index 895f8a09a71acfd03e11164e3b441a7d4e2de146..4f02260dd65b0dfcbfbf5812d2ec6a33444a3b1f 100644
> --- a/fs/init.c
> +++ b/fs/init.c
> @@ -157,7 +157,7 @@ int __init init_mknod(const char *filename, umode_t mode, unsigned int dev)
> error = security_path_mknod(&path, dentry, mode, dev);
> if (!error)
> error = vfs_mknod(mnt_idmap(path.mnt), path.dentry->d_inode,
> - dentry, mode, new_decode_dev(dev));
> + dentry, mode, new_decode_dev(dev), NULL);
> end_creating_path(&path, dentry);
> return error;
> }
> diff --git a/fs/namei.c b/fs/namei.c
> index 1427c53e13978e70adefdc572b71247536985430..2e1e3f0068a28271e07aa0fa0c7e0b04582400fe 100644
> --- a/fs/namei.c
> +++ b/fs/namei.c
> @@ -4302,13 +4302,15 @@ inline struct dentry *start_creating_user_path(
> }
> EXPORT_SYMBOL(start_creating_user_path);
>
> +
> /**
> * vfs_mknod - create device node or file
> - * @idmap: idmap of the mount the inode was found from
> - * @dir: inode of the parent directory
> - * @dentry: dentry of the child device node
> - * @mode: mode of the child device node
> - * @dev: device number of device to create
> + * @idmap: idmap of the mount the inode was found from
> + * @dir: inode of the parent directory
> + * @dentry: dentry of the child device node
> + * @mode: mode of the child device node
> + * @dev: device number of device to create
> + * @delegated_inode: returns parent inode, if the inode is delegated.
> *
> * Create a device node or file.
> *
> @@ -4319,7 +4321,8 @@ EXPORT_SYMBOL(start_creating_user_path);
> * raw inode simply pass @nop_mnt_idmap.
> */
> int vfs_mknod(struct mnt_idmap *idmap, struct inode *dir,
> - struct dentry *dentry, umode_t mode, dev_t dev)
> + struct dentry *dentry, umode_t mode, dev_t dev,
> + struct inode **delegated_inode)
> {
> bool is_whiteout = S_ISCHR(mode) && dev == WHITEOUT_DEV;
> int error = may_create(idmap, dir, dentry);
> @@ -4343,6 +4346,10 @@ int vfs_mknod(struct mnt_idmap *idmap, struct inode *dir,
> if (error)
> return error;
>
> + error = try_break_deleg(dir, delegated_inode);
> + if (error)
> + return error;
> +
> error = dir->i_op->mknod(idmap, dir, dentry, mode, dev);
> if (!error)
> fsnotify_create(dir, dentry);
> @@ -4402,11 +4409,13 @@ static int do_mknodat(int dfd, struct filename *name, umode_t mode,
> break;
> case S_IFCHR: case S_IFBLK:
> error = vfs_mknod(idmap, path.dentry->d_inode,
> - dentry, mode, new_decode_dev(dev));
> + dentry, mode, new_decode_dev(dev),
> + &delegated_inode);
> break;
> case S_IFIFO: case S_IFSOCK:
> error = vfs_mknod(idmap, path.dentry->d_inode,
> - dentry, mode, 0);
> + dentry, mode, 0,
> + &delegated_inode);
> break;
> }
> out2:
> diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
> index 7d8cd2595f197be9741ee6320d43ed6651896647..858485c76b6524e965b7cbc92f67c1a4eb19e34e 100644
> --- a/fs/nfsd/vfs.c
> +++ b/fs/nfsd/vfs.c
> @@ -1660,7 +1660,7 @@ nfsd_create_locked(struct svc_rqst *rqstp, struct svc_fh *fhp,
> case S_IFIFO:
> case S_IFSOCK:
> host_err = vfs_mknod(&nop_mnt_idmap, dirp, dchild,
> - iap->ia_mode, rdev);
> + iap->ia_mode, rdev, NULL);
> break;
> default:
> printk(KERN_WARNING "nfsd: bad file type %o in nfsd_create\n",
> diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h
> index d215d7349489686b66bb66e939b27046f7d836f6..8b8c99e9e1a518c365cfff952d391887ec18d453 100644
> --- a/fs/overlayfs/overlayfs.h
> +++ b/fs/overlayfs/overlayfs.h
> @@ -257,7 +257,7 @@ static inline int ovl_do_mknod(struct ovl_fs *ofs,
> struct inode *dir, struct dentry *dentry,
> umode_t mode, dev_t dev)
> {
> - int err = vfs_mknod(ovl_upper_mnt_idmap(ofs), dir, dentry, mode, dev);
> + int err = vfs_mknod(ovl_upper_mnt_idmap(ofs), dir, dentry, mode, dev, NULL);
>
> pr_debug("mknod(%pd2, 0%o, 0%o) = %i\n", dentry, mode, dev, err);
> return err;
> diff --git a/include/linux/fs.h b/include/linux/fs.h
> index d8bdaf7c87502ff17775602f5391d375738b4ed8..4ad49b39441b2c9088fd01a7e0e46a6511c26d2e 100644
> --- a/include/linux/fs.h
> +++ b/include/linux/fs.h
> @@ -2115,7 +2115,7 @@ int vfs_create(struct mnt_idmap *, struct inode *,
> struct dentry *vfs_mkdir(struct mnt_idmap *, struct inode *,
> struct dentry *, umode_t, struct inode **);
> int vfs_mknod(struct mnt_idmap *, struct inode *, struct dentry *,
> - umode_t, dev_t);
> + umode_t, dev_t, struct inode **);
> int vfs_symlink(struct mnt_idmap *, struct inode *,
> struct dentry *, const char *);
> int vfs_link(struct dentry *, struct mnt_idmap *, struct inode *,
> @@ -2151,7 +2151,7 @@ static inline int vfs_whiteout(struct mnt_idmap *idmap,
> struct inode *dir, struct dentry *dentry)
> {
> return vfs_mknod(idmap, dir, dentry, S_IFCHR | WHITEOUT_MODE,
> - WHITEOUT_DEV);
> + WHITEOUT_DEV, NULL);
> }
>
> struct file *kernel_tmpfile_open(struct mnt_idmap *idmap,
> diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
> index 768098dec2310008632558ae928703b37c3cc8ef..db1fd8d6a84c2c7c0d45b43d9c5a936b3d491b7b 100644
> --- a/net/unix/af_unix.c
> +++ b/net/unix/af_unix.c
> @@ -1399,7 +1399,7 @@ static int unix_bind_bsd(struct sock *sk, struct sockaddr_un *sunaddr,
> idmap = mnt_idmap(parent.mnt);
> err = security_path_mknod(&parent, dentry, mode, 0);
> if (!err)
> - err = vfs_mknod(idmap, d_inode(parent.dentry), dentry, mode, 0);
> + err = vfs_mknod(idmap, d_inode(parent.dentry), dentry, mode, 0, NULL);
> if (err)
> goto out_path;
> err = mutex_lock_interruptible(&u->bindlock);
>
> --
> 2.51.0
>
--
Jan Kara <jack@suse.com>
SUSE Labs, CR
next prev parent 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
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 [this message]
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=vuf6ypnlwgo6edemvtdhx3cpoufpr2iojbzqd4urocqjuoxj76@v7xwlpwnn77a \
--to=jack@suse.cz \
--cc=Dai.Ngo@oracle.com \
--cc=alex.aring@gmail.com \
--cc=amir73il@gmail.com \
--cc=anna@kernel.org \
--cc=bharathsm@microsoft.com \
--cc=brauner@kernel.org \
--cc=cem@kernel.org \
--cc=chuck.lever@oracle.com \
--cc=code@tyhicks.com \
--cc=dakr@kernel.org \
--cc=davem@davemloft.net \
--cc=dhowells@redhat.com \
--cc=ecryptfs@vger.kernel.org \
--cc=edumazet@google.com \
--cc=gregkh@linuxfoundation.org \
--cc=horms@kernel.org \
--cc=jlayton@kernel.org \
--cc=kuba@kernel.org \
--cc=kuniyu@google.com \
--cc=linkinjeon@kernel.org \
--cc=linux-cifs@vger.kernel.org \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-nfs@vger.kernel.org \
--cc=linux-unionfs@vger.kernel.org \
--cc=linux-xfs@vger.kernel.org \
--cc=miklos@szeredi.hu \
--cc=neil@brown.name \
--cc=netdev@vger.kernel.org \
--cc=netfs@lists.linux.dev \
--cc=okorniev@redhat.com \
--cc=pabeni@redhat.com \
--cc=pc@manguebit.org \
--cc=rafael@kernel.org \
--cc=ronniesahlberg@gmail.com \
--cc=samba-technical@lists.samba.org \
--cc=senozhatsky@chromium.org \
--cc=sfrench@samba.org \
--cc=smfrench@gmail.com \
--cc=sprasad@microsoft.com \
--cc=tom@talpey.com \
--cc=trondmy@kernel.org \
--cc=viro@zeniv.linux.org.uk \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).