1 #include "ceph_debug.h"
5 #include <linux/random.h>
6 #include <linux/slab.h>
7 #include <linux/types.h>
10 #include "messenger.h"
17 * choose a random mds that is "up" (i.e. has a state > 0), or -1.
19 int ceph_mdsmap_get_random_mds(struct ceph_mdsmap *m)
26 for (i = 0; i < m->m_max_mds; i++)
27 if (m->m_info[i].state > 0)
33 get_random_bytes(&r, 1);
36 for (i = 0; n > 0; i++, n--)
37 while (m->m_info[i].state <= 0)
46 * Ignore any fields we don't care about (there are quite a few of
49 struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end)
51 struct ceph_mdsmap *m;
56 m = kzalloc(sizeof(*m), GFP_NOFS);
58 return ERR_PTR(-ENOMEM);
60 ceph_decode_16_safe(p, end, version, bad);
62 ceph_decode_need(p, end, 8*sizeof(u32) + sizeof(u64), bad);
63 ceph_decode_32(p, m->m_epoch);
64 ceph_decode_32(p, m->m_client_epoch);
65 ceph_decode_32(p, m->m_last_failure);
66 ceph_decode_32(p, m->m_root);
67 ceph_decode_32(p, m->m_session_timeout);
68 ceph_decode_32(p, m->m_session_autoclose);
69 ceph_decode_64(p, m->m_max_file_size);
70 ceph_decode_32(p, m->m_max_mds);
72 m->m_info = kcalloc(m->m_max_mds, sizeof(*m->m_info), GFP_NOFS);
73 if (m->m_info == NULL)
76 /* pick out active nodes from mds_info (state > 0) */
78 for (i = 0; i < n; i++) {
83 struct ceph_entity_addr addr;
84 u32 num_export_targets;
85 void *pexport_targets = NULL;
87 ceph_decode_need(p, end, sizeof(addr) + 1 + sizeof(u32), bad);
88 ceph_decode_copy(p, &addr, sizeof(addr));
89 ceph_decode_8(p, infoversion);
90 ceph_decode_32(p, namelen); /* skip mds name */
93 ceph_decode_need(p, end,
94 4*sizeof(u32) + sizeof(u64) +
95 sizeof(addr) + sizeof(struct ceph_timespec),
97 ceph_decode_32(p, mds);
98 ceph_decode_32(p, inc);
99 ceph_decode_32(p, state);
100 ceph_decode_64(p, state_seq);
102 *p += sizeof(struct ceph_timespec);
104 ceph_decode_32_safe(p, end, namelen, bad);
106 if (infoversion >= 2) {
107 ceph_decode_32_safe(p, end, num_export_targets, bad);
108 pexport_targets = *p;
109 *p += num_export_targets * sizeof(u32);
111 num_export_targets = 0;
114 dout("mdsmap_decode %d/%d mds%d.%d %s %s\n",
115 i+1, n, mds, inc, pr_addr(&addr.in_addr),
116 ceph_mds_state_name(state));
117 if (mds >= 0 && mds < m->m_max_mds && state > 0) {
118 m->m_info[mds].state = state;
119 m->m_info[mds].addr = addr;
120 m->m_info[mds].num_export_targets = num_export_targets;
121 if (num_export_targets) {
122 m->m_info[mds].export_targets =
123 kcalloc(num_export_targets, sizeof(u32),
125 for (j = 0; j < num_export_targets; j++)
126 ceph_decode_32(&pexport_targets,
127 m->m_info[mds].export_targets[j]);
129 m->m_info[mds].export_targets = NULL;
135 ceph_decode_32_safe(p, end, n, bad);
136 m->m_num_data_pg_pools = n;
137 m->m_data_pg_pools = kcalloc(n, sizeof(u32), GFP_NOFS);
138 if (!m->m_data_pg_pools)
140 ceph_decode_need(p, end, sizeof(u32)*(n+1), bad);
141 for (i = 0; i < n; i++)
142 ceph_decode_32(p, m->m_data_pg_pools[i]);
143 ceph_decode_32(p, m->m_cas_pg_pool);
145 /* ok, we don't care about the rest. */
146 dout("mdsmap_decode success epoch %u\n", m->m_epoch);
152 pr_err("corrupt mdsmap\n");
153 ceph_mdsmap_destroy(m);
154 return ERR_PTR(-EINVAL);
157 void ceph_mdsmap_destroy(struct ceph_mdsmap *m)
161 for (i = 0; i < m->m_max_mds; i++)
162 kfree(m->m_info[i].export_targets);
164 kfree(m->m_data_pg_pools);