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ceph: allow connecting to mds whose rank >= mdsmap::m_max_mds

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mdsmap::m_max_mds is the expected count of active mds. It's not the
max rank of active mds. User can decrease mdsmap::m_max_mds, but does
not stop mds whose rank >= mdsmap::m_max_mds.

Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Yan, Zheng
2017-03-28 17:04:13 +08:00
committed by Ilya Dryomov
parent 8242c9f35a
commit 76201b6354
4 changed files with 56 additions and 26 deletions
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44
fs/ceph/mdsmap.c
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@@ -22,11 +22,11 @@ int ceph_mdsmap_get_random_mds(struct ceph_mdsmap *m)
int i;
/* special case for one mds */
if (1 == m->m_max_mds && m->m_info[0].state > 0)
if (1 == m->m_num_mds && m->m_info[0].state > 0)
return 0;
/* count */
for (i = 0; i < m->m_max_mds; i++)
for (i = 0; i < m->m_num_mds; i++)
if (m->m_info[i].state > 0)
n++;
if (n == 0)
@@ -135,8 +135,9 @@ struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end)
m->m_session_autoclose = ceph_decode_32(p);
m->m_max_file_size = ceph_decode_64(p);
m->m_max_mds = ceph_decode_32(p);
m->m_num_mds = m->m_max_mds;
m->m_info = kcalloc(m->m_max_mds, sizeof(*m->m_info), GFP_NOFS);
m->m_info = kcalloc(m->m_num_mds, sizeof(*m->m_info), GFP_NOFS);
if (m->m_info == NULL)
goto nomem;
@@ -207,9 +208,20 @@ struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end)
ceph_pr_addr(&addr.in_addr),
ceph_mds_state_name(state));
if (mds < 0 || mds >= m->m_max_mds || state <= 0)
if (mds < 0 || state <= 0)
continue;
if (mds >= m->m_num_mds) {
int new_num = max(mds + 1, m->m_num_mds * 2);
void *new_m_info = krealloc(m->m_info,
new_num * sizeof(*m->m_info),
GFP_NOFS | __GFP_ZERO);
if (!new_m_info)
goto nomem;
m->m_info = new_m_info;
m->m_num_mds = new_num;
}
info = &m->m_info[mds];
info->global_id = global_id;
info->state = state;
@@ -229,6 +241,14 @@ struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end)
info->export_targets = NULL;
}
}
if (m->m_num_mds > m->m_max_mds) {
/* find max up mds */
for (i = m->m_num_mds; i >= m->m_max_mds; i--) {
if (i == 0 || m->m_info[i-1].state > 0)
break;
}
m->m_num_mds = i;
}
/* pg_pools */
ceph_decode_32_safe(p, end, n, bad);
@@ -270,12 +290,22 @@ struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end)
for (i = 0; i < n; i++) {
s32 mds = ceph_decode_32(p);
if (mds >= 0 && mds < m->m_max_mds) {
if (mds >= 0 && mds < m->m_num_mds) {
if (m->m_info[mds].laggy)
num_laggy++;
}
}
m->m_num_laggy = num_laggy;
if (n > m->m_num_mds) {
void *new_m_info = krealloc(m->m_info,
n * sizeof(*m->m_info),
GFP_NOFS | __GFP_ZERO);
if (!new_m_info)
goto nomem;
m->m_info = new_m_info;
}
m->m_num_mds = n;
}
/* inc */
@@ -341,7 +371,7 @@ void ceph_mdsmap_destroy(struct ceph_mdsmap *m)
{
int i;
for (i = 0; i < m->m_max_mds; i++)
for (i = 0; i < m->m_num_mds; i++)
kfree(m->m_info[i].export_targets);
kfree(m->m_info);
kfree(m->m_data_pg_pools);
@@ -357,7 +387,7 @@ bool ceph_mdsmap_is_cluster_available(struct ceph_mdsmap *m)
return false;
if (m->m_num_laggy > 0)
return false;
for (i = 0; i < m->m_max_mds; i++) {
for (i = 0; i < m->m_num_mds; i++) {
if (m->m_info[i].state == CEPH_MDS_STATE_ACTIVE)
nr_active++;
}