1b2441318SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0 23d14c5d2SYehuda Sadeh #include <linux/ceph/ceph_debug.h> 32f2dc053SSage Weil 42f2dc053SSage Weil #include <linux/bug.h> 52f2dc053SSage Weil #include <linux/err.h> 62f2dc053SSage Weil #include <linux/random.h> 72f2dc053SSage Weil #include <linux/slab.h> 82f2dc053SSage Weil #include <linux/types.h> 92f2dc053SSage Weil 103d14c5d2SYehuda Sadeh #include <linux/ceph/mdsmap.h> 113d14c5d2SYehuda Sadeh #include <linux/ceph/messenger.h> 123d14c5d2SYehuda Sadeh #include <linux/ceph/decode.h> 132f2dc053SSage Weil 142f2dc053SSage Weil #include "super.h" 152f2dc053SSage Weil 162f2dc053SSage Weil 172f2dc053SSage Weil /* 182f2dc053SSage Weil * choose a random mds that is "up" (i.e. has a state > 0), or -1. 192f2dc053SSage Weil */ 202f2dc053SSage Weil int ceph_mdsmap_get_random_mds(struct ceph_mdsmap *m) 212f2dc053SSage Weil { 222f2dc053SSage Weil int n = 0; 23*74d6f030SXiubo Li int i, j; 24a84cd293SSam Lang 25a84cd293SSam Lang /* special case for one mds */ 2676201b63SYan, Zheng if (1 == m->m_num_mds && m->m_info[0].state > 0) 27a84cd293SSam Lang return 0; 282f2dc053SSage Weil 292f2dc053SSage Weil /* count */ 3076201b63SYan, Zheng for (i = 0; i < m->m_num_mds; i++) 312f2dc053SSage Weil if (m->m_info[i].state > 0) 322f2dc053SSage Weil n++; 332f2dc053SSage Weil if (n == 0) 342f2dc053SSage Weil return -1; 352f2dc053SSage Weil 362f2dc053SSage Weil /* pick */ 37a84cd293SSam Lang n = prandom_u32() % n; 38*74d6f030SXiubo Li for (j = 0, i = 0; i < m->m_num_mds; i++) { 39*74d6f030SXiubo Li if (m->m_info[i].state > 0) 40*74d6f030SXiubo Li j++; 41*74d6f030SXiubo Li if (j > n) 42*74d6f030SXiubo Li break; 43*74d6f030SXiubo Li } 442f2dc053SSage Weil 452f2dc053SSage Weil return i; 462f2dc053SSage Weil } 472f2dc053SSage Weil 48e9e427f0SYan, Zheng #define __decode_and_drop_type(p, end, type, bad) \ 49e9e427f0SYan, Zheng do { \ 50e9e427f0SYan, Zheng if (*p + sizeof(type) > end) \ 51e9e427f0SYan, Zheng goto bad; \ 52e9e427f0SYan, Zheng *p += sizeof(type); \ 53e9e427f0SYan, Zheng } while (0) 54e9e427f0SYan, Zheng 55e9e427f0SYan, Zheng #define __decode_and_drop_set(p, end, type, bad) \ 56e9e427f0SYan, Zheng do { \ 57e9e427f0SYan, Zheng u32 n; \ 58e9e427f0SYan, Zheng size_t need; \ 59e9e427f0SYan, Zheng ceph_decode_32_safe(p, end, n, bad); \ 60e9e427f0SYan, Zheng need = sizeof(type) * n; \ 61e9e427f0SYan, Zheng ceph_decode_need(p, end, need, bad); \ 62e9e427f0SYan, Zheng *p += need; \ 63e9e427f0SYan, Zheng } while (0) 64e9e427f0SYan, Zheng 65e9e427f0SYan, Zheng #define __decode_and_drop_map(p, end, ktype, vtype, bad) \ 66e9e427f0SYan, Zheng do { \ 67e9e427f0SYan, Zheng u32 n; \ 68e9e427f0SYan, Zheng size_t need; \ 69e9e427f0SYan, Zheng ceph_decode_32_safe(p, end, n, bad); \ 70e9e427f0SYan, Zheng need = (sizeof(ktype) + sizeof(vtype)) * n; \ 71e9e427f0SYan, Zheng ceph_decode_need(p, end, need, bad); \ 72e9e427f0SYan, Zheng *p += need; \ 73e9e427f0SYan, Zheng } while (0) 74e9e427f0SYan, Zheng 75e9e427f0SYan, Zheng 76e9e427f0SYan, Zheng static int __decode_and_drop_compat_set(void **p, void* end) 77e9e427f0SYan, Zheng { 78e9e427f0SYan, Zheng int i; 79e9e427f0SYan, Zheng /* compat, ro_compat, incompat*/ 80e9e427f0SYan, Zheng for (i = 0; i < 3; i++) { 81e9e427f0SYan, Zheng u32 n; 82e9e427f0SYan, Zheng ceph_decode_need(p, end, sizeof(u64) + sizeof(u32), bad); 83e9e427f0SYan, Zheng /* mask */ 84e9e427f0SYan, Zheng *p += sizeof(u64); 85e9e427f0SYan, Zheng /* names (map<u64, string>) */ 86e9e427f0SYan, Zheng n = ceph_decode_32(p); 87e9e427f0SYan, Zheng while (n-- > 0) { 88e9e427f0SYan, Zheng u32 len; 89e9e427f0SYan, Zheng ceph_decode_need(p, end, sizeof(u64) + sizeof(u32), 90e9e427f0SYan, Zheng bad); 91e9e427f0SYan, Zheng *p += sizeof(u64); 92e9e427f0SYan, Zheng len = ceph_decode_32(p); 93e9e427f0SYan, Zheng ceph_decode_need(p, end, len, bad); 94e9e427f0SYan, Zheng *p += len; 95e9e427f0SYan, Zheng } 96e9e427f0SYan, Zheng } 97e9e427f0SYan, Zheng return 0; 98e9e427f0SYan, Zheng bad: 99e9e427f0SYan, Zheng return -1; 100e9e427f0SYan, Zheng } 101e9e427f0SYan, Zheng 1022f2dc053SSage Weil /* 1032f2dc053SSage Weil * Decode an MDS map 1042f2dc053SSage Weil * 1052f2dc053SSage Weil * Ignore any fields we don't care about (there are quite a few of 1062f2dc053SSage Weil * them). 1072f2dc053SSage Weil */ 1082f2dc053SSage Weil struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end) 1092f2dc053SSage Weil { 1102f2dc053SSage Weil struct ceph_mdsmap *m; 1119ec7cab1SSage Weil const void *start = *p; 1122f2dc053SSage Weil int i, j, n; 113f3848af1SJeff Layton int err; 114d463a43dSYan, Zheng u8 mdsmap_v, mdsmap_cv; 115e9e427f0SYan, Zheng u16 mdsmap_ev; 1162f2dc053SSage Weil 1172f2dc053SSage Weil m = kzalloc(sizeof(*m), GFP_NOFS); 118d37b1d99SMarkus Elfring if (!m) 1192f2dc053SSage Weil return ERR_PTR(-ENOMEM); 1202f2dc053SSage Weil 121d463a43dSYan, Zheng ceph_decode_need(p, end, 1 + 1, bad); 122d463a43dSYan, Zheng mdsmap_v = ceph_decode_8(p); 123d463a43dSYan, Zheng mdsmap_cv = ceph_decode_8(p); 124d463a43dSYan, Zheng if (mdsmap_v >= 4) { 125d463a43dSYan, Zheng u32 mdsmap_len; 126d463a43dSYan, Zheng ceph_decode_32_safe(p, end, mdsmap_len, bad); 127d463a43dSYan, Zheng if (end < *p + mdsmap_len) 1284f6a7e5eSSage Weil goto bad; 129d463a43dSYan, Zheng end = *p + mdsmap_len; 1304f6a7e5eSSage Weil } 1312f2dc053SSage Weil 1322f2dc053SSage Weil ceph_decode_need(p, end, 8*sizeof(u32) + sizeof(u64), bad); 133c89136eaSSage Weil m->m_epoch = ceph_decode_32(p); 134c89136eaSSage Weil m->m_client_epoch = ceph_decode_32(p); 135c89136eaSSage Weil m->m_last_failure = ceph_decode_32(p); 136c89136eaSSage Weil m->m_root = ceph_decode_32(p); 137c89136eaSSage Weil m->m_session_timeout = ceph_decode_32(p); 138c89136eaSSage Weil m->m_session_autoclose = ceph_decode_32(p); 139c89136eaSSage Weil m->m_max_file_size = ceph_decode_64(p); 140c89136eaSSage Weil m->m_max_mds = ceph_decode_32(p); 14176201b63SYan, Zheng m->m_num_mds = m->m_max_mds; 1422f2dc053SSage Weil 14376201b63SYan, Zheng m->m_info = kcalloc(m->m_num_mds, sizeof(*m->m_info), GFP_NOFS); 144d37b1d99SMarkus Elfring if (!m->m_info) 145e9e427f0SYan, Zheng goto nomem; 1462f2dc053SSage Weil 1472f2dc053SSage Weil /* pick out active nodes from mds_info (state > 0) */ 148c89136eaSSage Weil n = ceph_decode_32(p); 1492f2dc053SSage Weil for (i = 0; i < n; i++) { 15094045e11SSage Weil u64 global_id; 1512f2dc053SSage Weil u32 namelen; 1522f2dc053SSage Weil s32 mds, inc, state; 1532f2dc053SSage Weil u64 state_seq; 154d463a43dSYan, Zheng u8 info_v; 155d463a43dSYan, Zheng void *info_end = NULL; 1562f2dc053SSage Weil struct ceph_entity_addr addr; 1572f2dc053SSage Weil u32 num_export_targets; 1582f2dc053SSage Weil void *pexport_targets = NULL; 1590deb01c9SSage Weil struct ceph_timespec laggy_since; 1606af86528SDan Carpenter struct ceph_mds_info *info; 1612f2dc053SSage Weil 162d463a43dSYan, Zheng ceph_decode_need(p, end, sizeof(u64) + 1, bad); 16394045e11SSage Weil global_id = ceph_decode_64(p); 164d463a43dSYan, Zheng info_v= ceph_decode_8(p); 165d463a43dSYan, Zheng if (info_v >= 4) { 166d463a43dSYan, Zheng u32 info_len; 167d463a43dSYan, Zheng u8 info_cv; 168d463a43dSYan, Zheng ceph_decode_need(p, end, 1 + sizeof(u32), bad); 169d463a43dSYan, Zheng info_cv = ceph_decode_8(p); 170d463a43dSYan, Zheng info_len = ceph_decode_32(p); 171d463a43dSYan, Zheng info_end = *p + info_len; 172d463a43dSYan, Zheng if (info_end > end) 173d463a43dSYan, Zheng goto bad; 174d463a43dSYan, Zheng } 175d463a43dSYan, Zheng 176d463a43dSYan, Zheng ceph_decode_need(p, end, sizeof(u64) + sizeof(u32), bad); 17794045e11SSage Weil *p += sizeof(u64); 178c89136eaSSage Weil namelen = ceph_decode_32(p); /* skip mds name */ 1792f2dc053SSage Weil *p += namelen; 1802f2dc053SSage Weil 1812f2dc053SSage Weil ceph_decode_need(p, end, 182e251e288SSage Weil 4*sizeof(u32) + sizeof(u64) + 1832f2dc053SSage Weil sizeof(addr) + sizeof(struct ceph_timespec), 1842f2dc053SSage Weil bad); 185c89136eaSSage Weil mds = ceph_decode_32(p); 186c89136eaSSage Weil inc = ceph_decode_32(p); 187c89136eaSSage Weil state = ceph_decode_32(p); 188c89136eaSSage Weil state_seq = ceph_decode_64(p); 189f3848af1SJeff Layton err = ceph_decode_entity_addr(p, end, &addr); 190f3848af1SJeff Layton if (err) 191f3848af1SJeff Layton goto corrupt; 1920deb01c9SSage Weil ceph_decode_copy(p, &laggy_since, sizeof(laggy_since)); 1932f2dc053SSage Weil *p += sizeof(u32); 1942f2dc053SSage Weil ceph_decode_32_safe(p, end, namelen, bad); 195e251e288SSage Weil *p += namelen; 196d463a43dSYan, Zheng if (info_v >= 2) { 1972f2dc053SSage Weil ceph_decode_32_safe(p, end, num_export_targets, bad); 1982f2dc053SSage Weil pexport_targets = *p; 199e251e288SSage Weil *p += num_export_targets * sizeof(u32); 2002f2dc053SSage Weil } else { 2012f2dc053SSage Weil num_export_targets = 0; 2022f2dc053SSage Weil } 2032f2dc053SSage Weil 204d463a43dSYan, Zheng if (info_end && *p != info_end) { 205d463a43dSYan, Zheng if (*p > info_end) 206d463a43dSYan, Zheng goto bad; 207d463a43dSYan, Zheng *p = info_end; 208d463a43dSYan, Zheng } 209d463a43dSYan, Zheng 21094045e11SSage Weil dout("mdsmap_decode %d/%d %lld mds%d.%d %s %s\n", 2113d14c5d2SYehuda Sadeh i+1, n, global_id, mds, inc, 212b726ec97SJeff Layton ceph_pr_addr(&addr), 2132f2dc053SSage Weil ceph_mds_state_name(state)); 2146af86528SDan Carpenter 21576201b63SYan, Zheng if (mds < 0 || state <= 0) 2166af86528SDan Carpenter continue; 2176af86528SDan Carpenter 21876201b63SYan, Zheng if (mds >= m->m_num_mds) { 21976201b63SYan, Zheng int new_num = max(mds + 1, m->m_num_mds * 2); 22076201b63SYan, Zheng void *new_m_info = krealloc(m->m_info, 22176201b63SYan, Zheng new_num * sizeof(*m->m_info), 22276201b63SYan, Zheng GFP_NOFS | __GFP_ZERO); 22376201b63SYan, Zheng if (!new_m_info) 22476201b63SYan, Zheng goto nomem; 22576201b63SYan, Zheng m->m_info = new_m_info; 22676201b63SYan, Zheng m->m_num_mds = new_num; 22776201b63SYan, Zheng } 22876201b63SYan, Zheng 2296af86528SDan Carpenter info = &m->m_info[mds]; 2306af86528SDan Carpenter info->global_id = global_id; 2316af86528SDan Carpenter info->state = state; 2326af86528SDan Carpenter info->addr = addr; 2336af86528SDan Carpenter info->laggy = (laggy_since.tv_sec != 0 || 2340deb01c9SSage Weil laggy_since.tv_nsec != 0); 2356af86528SDan Carpenter info->num_export_targets = num_export_targets; 2362f2dc053SSage Weil if (num_export_targets) { 2376af86528SDan Carpenter info->export_targets = kcalloc(num_export_targets, 2386af86528SDan Carpenter sizeof(u32), GFP_NOFS); 239d37b1d99SMarkus Elfring if (!info->export_targets) 240e9e427f0SYan, Zheng goto nomem; 2412f2dc053SSage Weil for (j = 0; j < num_export_targets; j++) 2426af86528SDan Carpenter info->export_targets[j] = 243c89136eaSSage Weil ceph_decode_32(&pexport_targets); 2442f2dc053SSage Weil } else { 2456af86528SDan Carpenter info->export_targets = NULL; 2462f2dc053SSage Weil } 2472f2dc053SSage Weil } 24876201b63SYan, Zheng if (m->m_num_mds > m->m_max_mds) { 24976201b63SYan, Zheng /* find max up mds */ 25076201b63SYan, Zheng for (i = m->m_num_mds; i >= m->m_max_mds; i--) { 25176201b63SYan, Zheng if (i == 0 || m->m_info[i-1].state > 0) 25276201b63SYan, Zheng break; 25376201b63SYan, Zheng } 25476201b63SYan, Zheng m->m_num_mds = i; 25576201b63SYan, Zheng } 2562f2dc053SSage Weil 2572f2dc053SSage Weil /* pg_pools */ 2582f2dc053SSage Weil ceph_decode_32_safe(p, end, n, bad); 2592f2dc053SSage Weil m->m_num_data_pg_pools = n; 2604f6a7e5eSSage Weil m->m_data_pg_pools = kcalloc(n, sizeof(u64), GFP_NOFS); 2612f2dc053SSage Weil if (!m->m_data_pg_pools) 262e9e427f0SYan, Zheng goto nomem; 2634f6a7e5eSSage Weil ceph_decode_need(p, end, sizeof(u64)*(n+1), bad); 2642f2dc053SSage Weil for (i = 0; i < n; i++) 2654f6a7e5eSSage Weil m->m_data_pg_pools[i] = ceph_decode_64(p); 2664f6a7e5eSSage Weil m->m_cas_pg_pool = ceph_decode_64(p); 267e9e427f0SYan, Zheng m->m_enabled = m->m_epoch > 1; 2682f2dc053SSage Weil 269e9e427f0SYan, Zheng mdsmap_ev = 1; 270e9e427f0SYan, Zheng if (mdsmap_v >= 2) { 271e9e427f0SYan, Zheng ceph_decode_16_safe(p, end, mdsmap_ev, bad_ext); 272e9e427f0SYan, Zheng } 273e9e427f0SYan, Zheng if (mdsmap_ev >= 3) { 274e9e427f0SYan, Zheng if (__decode_and_drop_compat_set(p, end) < 0) 275e9e427f0SYan, Zheng goto bad_ext; 276e9e427f0SYan, Zheng } 277e9e427f0SYan, Zheng /* metadata_pool */ 278e9e427f0SYan, Zheng if (mdsmap_ev < 5) { 279e9e427f0SYan, Zheng __decode_and_drop_type(p, end, u32, bad_ext); 280e9e427f0SYan, Zheng } else { 281e9e427f0SYan, Zheng __decode_and_drop_type(p, end, u64, bad_ext); 282e9e427f0SYan, Zheng } 283e9e427f0SYan, Zheng 284e9e427f0SYan, Zheng /* created + modified + tableserver */ 285e9e427f0SYan, Zheng __decode_and_drop_type(p, end, struct ceph_timespec, bad_ext); 286e9e427f0SYan, Zheng __decode_and_drop_type(p, end, struct ceph_timespec, bad_ext); 287e9e427f0SYan, Zheng __decode_and_drop_type(p, end, u32, bad_ext); 288e9e427f0SYan, Zheng 289e9e427f0SYan, Zheng /* in */ 290e9e427f0SYan, Zheng { 291e9e427f0SYan, Zheng int num_laggy = 0; 292e9e427f0SYan, Zheng ceph_decode_32_safe(p, end, n, bad_ext); 293e9e427f0SYan, Zheng ceph_decode_need(p, end, sizeof(u32) * n, bad_ext); 294e9e427f0SYan, Zheng 295e9e427f0SYan, Zheng for (i = 0; i < n; i++) { 296e9e427f0SYan, Zheng s32 mds = ceph_decode_32(p); 29776201b63SYan, Zheng if (mds >= 0 && mds < m->m_num_mds) { 298e9e427f0SYan, Zheng if (m->m_info[mds].laggy) 299e9e427f0SYan, Zheng num_laggy++; 300e9e427f0SYan, Zheng } 301e9e427f0SYan, Zheng } 302e9e427f0SYan, Zheng m->m_num_laggy = num_laggy; 30376201b63SYan, Zheng 30476201b63SYan, Zheng if (n > m->m_num_mds) { 30576201b63SYan, Zheng void *new_m_info = krealloc(m->m_info, 30676201b63SYan, Zheng n * sizeof(*m->m_info), 30776201b63SYan, Zheng GFP_NOFS | __GFP_ZERO); 30876201b63SYan, Zheng if (!new_m_info) 30976201b63SYan, Zheng goto nomem; 31076201b63SYan, Zheng m->m_info = new_m_info; 31176201b63SYan, Zheng } 31276201b63SYan, Zheng m->m_num_mds = n; 313e9e427f0SYan, Zheng } 314e9e427f0SYan, Zheng 315e9e427f0SYan, Zheng /* inc */ 316e9e427f0SYan, Zheng __decode_and_drop_map(p, end, u32, u32, bad_ext); 317e9e427f0SYan, Zheng /* up */ 318e9e427f0SYan, Zheng __decode_and_drop_map(p, end, u32, u64, bad_ext); 319e9e427f0SYan, Zheng /* failed */ 320e9e427f0SYan, Zheng __decode_and_drop_set(p, end, u32, bad_ext); 321e9e427f0SYan, Zheng /* stopped */ 322e9e427f0SYan, Zheng __decode_and_drop_set(p, end, u32, bad_ext); 323e9e427f0SYan, Zheng 324e9e427f0SYan, Zheng if (mdsmap_ev >= 4) { 325e9e427f0SYan, Zheng /* last_failure_osd_epoch */ 326e9e427f0SYan, Zheng __decode_and_drop_type(p, end, u32, bad_ext); 327e9e427f0SYan, Zheng } 328e9e427f0SYan, Zheng if (mdsmap_ev >= 6) { 329e9e427f0SYan, Zheng /* ever_allowed_snaps */ 330e9e427f0SYan, Zheng __decode_and_drop_type(p, end, u8, bad_ext); 331e9e427f0SYan, Zheng /* explicitly_allowed_snaps */ 332e9e427f0SYan, Zheng __decode_and_drop_type(p, end, u8, bad_ext); 333e9e427f0SYan, Zheng } 334e9e427f0SYan, Zheng if (mdsmap_ev >= 7) { 335e9e427f0SYan, Zheng /* inline_data_enabled */ 336e9e427f0SYan, Zheng __decode_and_drop_type(p, end, u8, bad_ext); 337e9e427f0SYan, Zheng } 338e9e427f0SYan, Zheng if (mdsmap_ev >= 8) { 339e9e427f0SYan, Zheng u32 name_len; 340e9e427f0SYan, Zheng /* enabled */ 341e9e427f0SYan, Zheng ceph_decode_8_safe(p, end, m->m_enabled, bad_ext); 342e9e427f0SYan, Zheng ceph_decode_32_safe(p, end, name_len, bad_ext); 343e9e427f0SYan, Zheng ceph_decode_need(p, end, name_len, bad_ext); 344e9e427f0SYan, Zheng *p += name_len; 345e9e427f0SYan, Zheng } 346e9e427f0SYan, Zheng /* damaged */ 347e9e427f0SYan, Zheng if (mdsmap_ev >= 9) { 348e9e427f0SYan, Zheng size_t need; 349e9e427f0SYan, Zheng ceph_decode_32_safe(p, end, n, bad_ext); 350e9e427f0SYan, Zheng need = sizeof(u32) * n; 351e9e427f0SYan, Zheng ceph_decode_need(p, end, need, bad_ext); 352e9e427f0SYan, Zheng *p += need; 353e9e427f0SYan, Zheng m->m_damaged = n > 0; 354e9e427f0SYan, Zheng } else { 355e9e427f0SYan, Zheng m->m_damaged = false; 356e9e427f0SYan, Zheng } 357e9e427f0SYan, Zheng bad_ext: 358d463a43dSYan, Zheng *p = end; 3592f2dc053SSage Weil dout("mdsmap_decode success epoch %u\n", m->m_epoch); 3602f2dc053SSage Weil return m; 361e9e427f0SYan, Zheng nomem: 3622f2dc053SSage Weil err = -ENOMEM; 363e9e427f0SYan, Zheng goto out_err; 364f3848af1SJeff Layton corrupt: 3652f2dc053SSage Weil pr_err("corrupt mdsmap\n"); 3669ec7cab1SSage Weil print_hex_dump(KERN_DEBUG, "mdsmap: ", 3679ec7cab1SSage Weil DUMP_PREFIX_OFFSET, 16, 1, 3689ec7cab1SSage Weil start, end - start, true); 369e9e427f0SYan, Zheng out_err: 3702f2dc053SSage Weil ceph_mdsmap_destroy(m); 371c213b50bSEmil Goode return ERR_PTR(err); 372f3848af1SJeff Layton bad: 373f3848af1SJeff Layton err = -EINVAL; 374f3848af1SJeff Layton goto corrupt; 3752f2dc053SSage Weil } 3762f2dc053SSage Weil 3772f2dc053SSage Weil void ceph_mdsmap_destroy(struct ceph_mdsmap *m) 3782f2dc053SSage Weil { 3792f2dc053SSage Weil int i; 3802f2dc053SSage Weil 38176201b63SYan, Zheng for (i = 0; i < m->m_num_mds; i++) 3822f2dc053SSage Weil kfree(m->m_info[i].export_targets); 3832f2dc053SSage Weil kfree(m->m_info); 3842f2dc053SSage Weil kfree(m->m_data_pg_pools); 3852f2dc053SSage Weil kfree(m); 3862f2dc053SSage Weil } 387e9e427f0SYan, Zheng 388e9e427f0SYan, Zheng bool ceph_mdsmap_is_cluster_available(struct ceph_mdsmap *m) 389e9e427f0SYan, Zheng { 390e9e427f0SYan, Zheng int i, nr_active = 0; 391e9e427f0SYan, Zheng if (!m->m_enabled) 392e9e427f0SYan, Zheng return false; 393e9e427f0SYan, Zheng if (m->m_damaged) 394e9e427f0SYan, Zheng return false; 395e9e427f0SYan, Zheng if (m->m_num_laggy > 0) 396e9e427f0SYan, Zheng return false; 39776201b63SYan, Zheng for (i = 0; i < m->m_num_mds; i++) { 398e9e427f0SYan, Zheng if (m->m_info[i].state == CEPH_MDS_STATE_ACTIVE) 399e9e427f0SYan, Zheng nr_active++; 400e9e427f0SYan, Zheng } 401e9e427f0SYan, Zheng return nr_active > 0; 402e9e427f0SYan, Zheng } 403