diff mbox series

[v3] ceph: don't let check_caps skip sending responses for revoke msgs

Message ID 20230629023118.267295-1-xiubli@redhat.com (mailing list archive)
State New, archived
Headers show
Series [v3] ceph: don't let check_caps skip sending responses for revoke msgs | expand

Commit Message

Xiubo Li June 29, 2023, 2:31 a.m. UTC 
From: Xiubo Li <xiubli@redhat.com>

If a client sends out a cap update dropping caps with the prior 'seq'
just before an incoming cap revoke request, then the client may drop
the revoke because it believes it's already released the requested
capabilities.

This causes the MDS to wait indefinitely for the client to respond
to the revoke. It's therefore always a good idea to ack the cap
revoke request with the bumped up 'seq'.

Cc: stable@vger.kernel.org
Link: https://tracker.ceph.com/issues/61782
Signed-off-by: Xiubo Li <xiubli@redhat.com>
Reviewed-by: Milind Changire <mchangir@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
---

V3:
- Updated the commit message from Patrick. Thanks!


 fs/ceph/caps.c | 9 +++++++++
 1 file changed, 9 insertions(+)

Comments

Patrick Donnelly June 29, 2023, 12:38 p.m. UTC | #1 
On Wed, Jun 28, 2023 at 10:36 PM <xiubli@redhat.com> wrote:
>
> From: Xiubo Li <xiubli@redhat.com>
>
> If a client sends out a cap update dropping caps with the prior 'seq'
> just before an incoming cap revoke request, then the client may drop
> the revoke because it believes it's already released the requested
> capabilities.
>
> This causes the MDS to wait indefinitely for the client to respond
> to the revoke. It's therefore always a good idea to ack the cap
> revoke request with the bumped up 'seq'.
>
> Cc: stable@vger.kernel.org
> Link: https://tracker.ceph.com/issues/61782
> Signed-off-by: Xiubo Li <xiubli@redhat.com>
> Reviewed-by: Milind Changire <mchangir@redhat.com>
> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

Reviewed-by: Patrick Donnelly <pdonnell@redhat.com>
diff mbox series

Patch

diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index cef91dd5ef83..e2bb0d0072da 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -3566,6 +3566,15 @@  static void handle_cap_grant(struct inode *inode,
 	}
 	BUG_ON(cap->issued & ~cap->implemented);
 
+	/* don't let check_caps skip sending a response to MDS for revoke msgs */
+	if (le32_to_cpu(grant->op) == CEPH_CAP_OP_REVOKE) {
+		cap->mds_wanted = 0;
+		if (cap == ci->i_auth_cap)
+			check_caps = 1; /* check auth cap only */
+		else
+			check_caps = 2; /* check all caps */
+	}
+
 	if (extra_info->inline_version > 0 &&
 	    extra_info->inline_version >= ci->i_inline_version) {
 		ci->i_inline_version = extra_info->inline_version;