ceph-devel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Luis Henriques <lhenriques@suse.de>
To: Jeff Layton <jlayton@kernel.org>
Cc: ceph-devel@vger.kernel.org, idryomov@gmail.com, pdonnell@redhat.com
Subject: Re: [PATCH v2] ceph: add a new vxattr to return auth mds for an inode
Date: Wed, 28 Jul 2021 11:28:14 +0100	[thread overview]
Message-ID: <YQExPj9b2I2ZMZW1@suse.de> (raw)
In-Reply-To: <20210727184253.171816-1-jlayton@kernel.org>

On Tue, Jul 27, 2021 at 02:42:53PM -0400, Jeff Layton wrote:
> Add a new vxattr that shows what MDS is authoritative for an inode (if
> we happen to have auth caps). If we don't have an auth cap for the inode
> then just return -1.
> 
> URL: https://tracker.ceph.com/issues/1276
> Signed-off-by: Jeff Layton <jlayton@kernel.org>
> ---
>  fs/ceph/xattr.c | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
> 
> v2: ensure we hold the i_ceph_lock when working with the i_auth_cap.

Yeah, this lock is definitely needed here.  LGTM.

Cheers,
--
Luís


> diff --git a/fs/ceph/xattr.c b/fs/ceph/xattr.c
> index 1242db8d3444..159a1ffa4f4b 100644
> --- a/fs/ceph/xattr.c
> +++ b/fs/ceph/xattr.c
> @@ -340,6 +340,18 @@ static ssize_t ceph_vxattrcb_caps(struct ceph_inode_info *ci, char *val,
>  			      ceph_cap_string(issued), issued);
>  }
>  
> +static ssize_t ceph_vxattrcb_auth_mds(struct ceph_inode_info *ci,
> +				       char *val, size_t size)
> +{
> +	int ret;
> +
> +	spin_lock(&ci->i_ceph_lock);
> +	ret = ceph_fmt_xattr(val, size, "%d",
> +			     ci->i_auth_cap ? ci->i_auth_cap->session->s_mds : -1);
> +	spin_unlock(&ci->i_ceph_lock);
> +	return ret;
> +}
> +
>  #define CEPH_XATTR_NAME(_type, _name)	XATTR_CEPH_PREFIX #_type "." #_name
>  #define CEPH_XATTR_NAME2(_type, _name, _name2)	\
>  	XATTR_CEPH_PREFIX #_type "." #_name "." #_name2
> @@ -473,6 +485,13 @@ static struct ceph_vxattr ceph_common_vxattrs[] = {
>  		.exists_cb = NULL,
>  		.flags = VXATTR_FLAG_READONLY,
>  	},
> +	{
> +		.name = "ceph.auth_mds",
> +		.name_size = sizeof("ceph.auth_mds"),
> +		.getxattr_cb = ceph_vxattrcb_auth_mds,
> +		.exists_cb = NULL,
> +		.flags = VXATTR_FLAG_READONLY,
> +	},
>  	{ .name = NULL, 0 }	/* Required table terminator */
>  };
>  
> -- 
> 2.31.1
> 

      reply	other threads:[~2021-07-28 10:28 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-27 11:35 [PATCH] " Jeff Layton
2021-07-27 14:46 ` Luis Henriques
2021-07-27 15:17   ` Jeff Layton
2021-07-27 15:45     ` Luis Henriques
2021-07-27 15:53       ` Jeff Layton
2021-07-27 18:42 ` [PATCH v2] " Jeff Layton
2021-07-28 10:28   ` Luis Henriques [this message]

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=YQExPj9b2I2ZMZW1@suse.de \
    --to=lhenriques@suse.de \
    --cc=ceph-devel@vger.kernel.org \
    --cc=idryomov@gmail.com \
    --cc=jlayton@kernel.org \
    --cc=pdonnell@redhat.com \
    --subject='Re: [PATCH v2] ceph: add a new vxattr to return auth mds for an inode' \
    /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

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 NNTP newsgroup(s).