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vfs: make vfs_mknod break delegations on parent directory

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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 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.

Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: NeilBrown <neil@brown.name>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Link: https://patch.msgid.link/20251111-dir-deleg-ro-v6-11-52f3feebb2f2@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Jeff Layton
2025-11-11 09:12:52 -05:00
committed by Christian Brauner
parent c826229c6a
commit e8960c1b2e
8 changed files with 23 additions and 16 deletions
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2
net/unix/af_unix.c
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@@ -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);