linux-kernel - Re: [PATCH v3 03/38] vfs: add try_break_deleg calls for parents to vfs

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Message-ID: <cx5cpyg2q2ro3hpn55z673bk44tm5syftxso2hawe4ioe7jv2s@itiemyvjhgtc>
Date: Thu, 25 Sep 2025 17:52:55 +0200
From: Jan Kara <jack@...e.cz>
To: Jeff Layton <jlayton@...nel.org>
Cc: Alexander Viro <viro@...iv.linux.org.uk>, 
	Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>, Chuck Lever <chuck.lever@...cle.com>, 
	Alexander Aring <alex.aring@...il.com>, Trond Myklebust <trondmy@...nel.org>, 
	Anna Schumaker <anna@...nel.org>, Steve French <sfrench@...ba.org>, 
	Ronnie Sahlberg <ronniesahlberg@...il.com>, Shyam Prasad N <sprasad@...rosoft.com>, 
	Tom Talpey <tom@...pey.com>, Bharath SM <bharathsm@...rosoft.com>, 
	NeilBrown <neil@...wn.name>, Olga Kornievskaia <okorniev@...hat.com>, 
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Subject: Re: [PATCH v3 03/38] vfs: add try_break_deleg calls for parents to
 vfs_{link,rename,unlink}

On Wed 24-09-25 14:05:49, 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.
> 
> vfs_link, vfs_unlink, and vfs_rename all have existing delegation break
> handling for the children in the rename. Add the necessary calls for
> breaking delegations in the parent(s) as well.
> 
> Signed-off-by: Jeff Layton <jlayton@...nel.org>

Looks good. Feel free to add:

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

								Honza

> ---
>  fs/namei.c | 15 ++++++++++++++-
>  1 file changed, 14 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/namei.c b/fs/namei.c
> index cd43ff89fbaa38206db2aec4f097ca119819f92e..cd517eb232317d326e6d2fc5a60cb4c7569a137d 100644
> --- a/fs/namei.c
> +++ b/fs/namei.c
> @@ -4580,6 +4580,9 @@ int vfs_unlink(struct mnt_idmap *idmap, struct inode *dir,
>  	else {
>  		error = security_inode_unlink(dir, dentry);
>  		if (!error) {
> +			error = try_break_deleg(dir, delegated_inode);
> +			if (error)
> +				goto out;
>  			error = try_break_deleg(target, delegated_inode);
>  			if (error)
>  				goto out;
> @@ -4849,7 +4852,9 @@ int vfs_link(struct dentry *old_dentry, struct mnt_idmap *idmap,
>  	else if (max_links && inode->i_nlink >= max_links)
>  		error = -EMLINK;
>  	else {
> -		error = try_break_deleg(inode, delegated_inode);
> +		error = try_break_deleg(dir, delegated_inode);
> +		if (!error)
> +			error = try_break_deleg(inode, delegated_inode);
>  		if (!error)
>  			error = dir->i_op->link(old_dentry, dir, new_dentry);
>  	}
> @@ -5116,6 +5121,14 @@ int vfs_rename(struct renamedata *rd)
>  		    old_dir->i_nlink >= max_links)
>  			goto out;
>  	}
> +	error = try_break_deleg(old_dir, delegated_inode);
> +	if (error)
> +		goto out;
> +	if (new_dir != old_dir) {
> +		error = try_break_deleg(new_dir, delegated_inode);
> +		if (error)
> +			goto out;
> +	}
>  	if (!is_dir) {
>  		error = try_break_deleg(source, delegated_inode);
>  		if (error)
> 
> -- 
> 2.51.0
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR