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ceph: fix MDS random selection readiness predicate

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CEPH_MDS_IS_READY() is parsed so that the ternary expression can
return true for an MDS entry with state 0 when it is not laggy. This
allows the random selector to choose a down/DNE rank.

Group the ternary expression under the state check so zero-state ranks
are not treated as ready.

Cc: stable@vger.kernel.org
Fixes: b38c9eb475 ("ceph: add possible_max_rank and make the code more readable")
Link: https://tracker.ceph.com/issues/78648
Signed-off-by: Yiming Zhu <zhuyiming@kuaishou.com>
Reviewed-by: Viacheslav Dubeyko <slava@dubeyko.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Yiming Zhu 2026-07-24 18:49:20 +08:00 committed by Ilya Dryomov
parent 3660b98d12
commit 2c11c4bfdb
1 changed files with 1 additions and 1 deletions
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2
fs/ceph/mdsmap.c
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@ -15,7 +15,7 @@
#include "super.h"
#define CEPH_MDS_IS_READY(i, ignore_laggy) \
(m->m_info[i].state > 0 && ignore_laggy ? true : !m->m_info[i].laggy)
(m->m_info[i].state > 0 && (ignore_laggy ? true : !m->m_info[i].laggy))
static int __mdsmap_get_random_mds(struct ceph_mdsmap *m, bool ignore_laggy)
{