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From: Xiubo Li <xiubli@redhat.com>
To: Jeff Layton <jlayton@kernel.org>,
	ceph-devel@vger.kernel.org, idryomov@gmail.com
Cc: linux-fsdevel@vger.kernel.org, viro@zeniv.linux.org.uk
Subject: Re: [PATCH 1/2] ceph: don't clobber i_snap_caps on non-I_NEW inode
Date: Fri, 19 Mar 2021 13:03:34 +0800	[thread overview]
Message-ID: <e70eb841-5669-83e0-4c61-ec8153cc5a9b@redhat.com> (raw)
In-Reply-To: <20210315180717.266155-2-jlayton@kernel.org>

On 2021/3/16 2:07, Jeff Layton wrote:
> We want the snapdir to mirror the non-snapped directory's attributes for
> most things, but i_snap_caps represents the caps granted on the snapshot
> directory by the MDS itself. A misbehaving MDS could issue different
> caps for the snapdir and we lose them here.
>
> Only reset i_snap_caps when the inode is I_NEW.
>
> Reported-by: Al Viro <viro@zeniv.linux.org.uk>
> Signed-off-by: Jeff Layton <jlayton@kernel.org>
> ---
>   fs/ceph/inode.c | 7 ++++---
>   1 file changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
> index 26dc7a296f6b..fc7f4bf63306 100644
> --- a/fs/ceph/inode.c
> +++ b/fs/ceph/inode.c
> @@ -101,12 +101,13 @@ struct inode *ceph_get_snapdir(struct inode *parent)
>   	inode->i_atime = parent->i_atime;
>   	inode->i_op = &ceph_snapdir_iops;
>   	inode->i_fop = &ceph_snapdir_fops;
> -	ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
> -	ci->i_rbytes = 0;
>   	ci->i_btime = ceph_inode(parent)->i_btime;
> +	ci->i_rbytes = 0;
>   

Hi Jeff,

BTW, why we need to set other members here if the i_state is not I_NEW ?

Are they necessary ?

> -	if (inode->i_state & I_NEW)
> +	if (inode->i_state & I_NEW) {
> +		ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
>   		unlock_new_inode(inode);
> +	}
>   
>   	return inode;
>   }



  reply	other threads:[~2021-03-19  5:04 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-15 18:07 [PATCH 0/2] ceph: snapdir dentry handling fixes Jeff Layton
2021-03-15 18:07 ` [PATCH 1/2] ceph: don't clobber i_snap_caps on non-I_NEW inode Jeff Layton
2021-03-19  5:03   ` Xiubo Li [this message]
2021-03-19 12:51     ` Jeff Layton
2021-03-19 13:42       ` Xiubo Li
2021-03-15 18:07 ` [PATCH 2/2] ceph: don't use d_add in ceph_handle_snapdir Jeff Layton

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