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

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>
Reviewed-by: Patrick Donnelly <pdonnell@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Xiubo Li 2023-06-28 07:57:09 +08:00 committed by Ilya Dryomov
parent ce72d4e0f1
commit 257e6172ab
1 changed files with 9 additions and 0 deletions
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9
fs/ceph/caps.c
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@ -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;