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 165d47648fSXiubo Li #define CEPH_MDS_IS_READY(i, ignore_laggy) \ 17b38c9eb4SXiubo Li (m->m_info[i].state > 0 && ignore_laggy ? true : !m->m_info[i].laggy) 182f2dc053SSage Weil 195d47648fSXiubo Li static int __mdsmap_get_random_mds(struct ceph_mdsmap *m, bool ignore_laggy) 202f2dc053SSage Weil { 212f2dc053SSage Weil int n = 0; 2274d6f030SXiubo Li int i, j; 23a84cd293SSam Lang 242f2dc053SSage Weil /* count */ 25b38c9eb4SXiubo Li for (i = 0; i < m->possible_max_rank; i++) 265d47648fSXiubo Li if (CEPH_MDS_IS_READY(i, ignore_laggy)) 272f2dc053SSage Weil n++; 282f2dc053SSage Weil if (n == 0) 292f2dc053SSage Weil return -1; 302f2dc053SSage Weil 312f2dc053SSage Weil /* pick */ 32a84cd293SSam Lang n = prandom_u32() % n; 33b38c9eb4SXiubo Li for (j = 0, i = 0; i < m->possible_max_rank; i++) { 345d47648fSXiubo Li if (CEPH_MDS_IS_READY(i, ignore_laggy)) 3574d6f030SXiubo Li j++; 3674d6f030SXiubo Li if (j > n) 3774d6f030SXiubo Li break; 3874d6f030SXiubo Li } 392f2dc053SSage Weil 402f2dc053SSage Weil return i; 412f2dc053SSage Weil } 422f2dc053SSage Weil 435d47648fSXiubo Li /* 445d47648fSXiubo Li * choose a random mds that is "up" (i.e. has a state > 0), or -1. 455d47648fSXiubo Li */ 465d47648fSXiubo Li int ceph_mdsmap_get_random_mds(struct ceph_mdsmap *m) 475d47648fSXiubo Li { 485d47648fSXiubo Li int mds; 495d47648fSXiubo Li 505d47648fSXiubo Li mds = __mdsmap_get_random_mds(m, false); 51b38c9eb4SXiubo Li if (mds == m->possible_max_rank || mds == -1) 525d47648fSXiubo Li mds = __mdsmap_get_random_mds(m, true); 535d47648fSXiubo Li 54b38c9eb4SXiubo Li return mds == m->possible_max_rank ? -1 : mds; 555d47648fSXiubo Li } 565d47648fSXiubo Li 57e9e427f0SYan, Zheng #define __decode_and_drop_type(p, end, type, bad) \ 58e9e427f0SYan, Zheng do { \ 59e9e427f0SYan, Zheng if (*p + sizeof(type) > end) \ 60e9e427f0SYan, Zheng goto bad; \ 61e9e427f0SYan, Zheng *p += sizeof(type); \ 62e9e427f0SYan, Zheng } while (0) 63e9e427f0SYan, Zheng 64e9e427f0SYan, Zheng #define __decode_and_drop_set(p, end, type, bad) \ 65e9e427f0SYan, Zheng do { \ 66e9e427f0SYan, Zheng u32 n; \ 67e9e427f0SYan, Zheng size_t need; \ 68e9e427f0SYan, Zheng ceph_decode_32_safe(p, end, n, bad); \ 69e9e427f0SYan, Zheng need = sizeof(type) * n; \ 70e9e427f0SYan, Zheng ceph_decode_need(p, end, need, bad); \ 71e9e427f0SYan, Zheng *p += need; \ 72e9e427f0SYan, Zheng } while (0) 73e9e427f0SYan, Zheng 74e9e427f0SYan, Zheng #define __decode_and_drop_map(p, end, ktype, vtype, bad) \ 75e9e427f0SYan, Zheng do { \ 76e9e427f0SYan, Zheng u32 n; \ 77e9e427f0SYan, Zheng size_t need; \ 78e9e427f0SYan, Zheng ceph_decode_32_safe(p, end, n, bad); \ 79e9e427f0SYan, Zheng need = (sizeof(ktype) + sizeof(vtype)) * n; \ 80e9e427f0SYan, Zheng ceph_decode_need(p, end, need, bad); \ 81e9e427f0SYan, Zheng *p += need; \ 82e9e427f0SYan, Zheng } while (0) 83e9e427f0SYan, Zheng 84e9e427f0SYan, Zheng 85e9e427f0SYan, Zheng static int __decode_and_drop_compat_set(void **p, void* end) 86e9e427f0SYan, Zheng { 87e9e427f0SYan, Zheng int i; 88e9e427f0SYan, Zheng /* compat, ro_compat, incompat*/ 89e9e427f0SYan, Zheng for (i = 0; i < 3; i++) { 90e9e427f0SYan, Zheng u32 n; 91e9e427f0SYan, Zheng ceph_decode_need(p, end, sizeof(u64) + sizeof(u32), bad); 92e9e427f0SYan, Zheng /* mask */ 93e9e427f0SYan, Zheng *p += sizeof(u64); 94e9e427f0SYan, Zheng /* names (map<u64, string>) */ 95e9e427f0SYan, Zheng n = ceph_decode_32(p); 96e9e427f0SYan, Zheng while (n-- > 0) { 97e9e427f0SYan, Zheng u32 len; 98e9e427f0SYan, Zheng ceph_decode_need(p, end, sizeof(u64) + sizeof(u32), 99e9e427f0SYan, Zheng bad); 100e9e427f0SYan, Zheng *p += sizeof(u64); 101e9e427f0SYan, Zheng len = ceph_decode_32(p); 102e9e427f0SYan, Zheng ceph_decode_need(p, end, len, bad); 103e9e427f0SYan, Zheng *p += len; 104e9e427f0SYan, Zheng } 105e9e427f0SYan, Zheng } 106e9e427f0SYan, Zheng return 0; 107e9e427f0SYan, Zheng bad: 108e9e427f0SYan, Zheng return -1; 109e9e427f0SYan, Zheng } 110e9e427f0SYan, Zheng 1112f2dc053SSage Weil /* 1122f2dc053SSage Weil * Decode an MDS map 1132f2dc053SSage Weil * 1142f2dc053SSage Weil * Ignore any fields we don't care about (there are quite a few of 1152f2dc053SSage Weil * them). 1162f2dc053SSage Weil */ 1172f2dc053SSage Weil struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end) 1182f2dc053SSage Weil { 1192f2dc053SSage Weil struct ceph_mdsmap *m; 1209ec7cab1SSage Weil const void *start = *p; 1212f2dc053SSage Weil int i, j, n; 122f3848af1SJeff Layton int err; 123*8e298debSJia Yang u8 mdsmap_v; 124e9e427f0SYan, Zheng u16 mdsmap_ev; 1252f2dc053SSage Weil 1262f2dc053SSage Weil m = kzalloc(sizeof(*m), GFP_NOFS); 127d37b1d99SMarkus Elfring if (!m) 1282f2dc053SSage Weil return ERR_PTR(-ENOMEM); 1292f2dc053SSage Weil 130d463a43dSYan, Zheng ceph_decode_need(p, end, 1 + 1, bad); 131d463a43dSYan, Zheng mdsmap_v = ceph_decode_8(p); 132*8e298debSJia Yang *p += sizeof(u8); /* mdsmap_cv */ 133d463a43dSYan, Zheng if (mdsmap_v >= 4) { 134d463a43dSYan, Zheng u32 mdsmap_len; 135d463a43dSYan, Zheng ceph_decode_32_safe(p, end, mdsmap_len, bad); 136d463a43dSYan, Zheng if (end < *p + mdsmap_len) 1374f6a7e5eSSage Weil goto bad; 138d463a43dSYan, Zheng end = *p + mdsmap_len; 1394f6a7e5eSSage Weil } 1402f2dc053SSage Weil 1412f2dc053SSage Weil ceph_decode_need(p, end, 8*sizeof(u32) + sizeof(u64), bad); 142c89136eaSSage Weil m->m_epoch = ceph_decode_32(p); 143c89136eaSSage Weil m->m_client_epoch = ceph_decode_32(p); 144c89136eaSSage Weil m->m_last_failure = ceph_decode_32(p); 145c89136eaSSage Weil m->m_root = ceph_decode_32(p); 146c89136eaSSage Weil m->m_session_timeout = ceph_decode_32(p); 147c89136eaSSage Weil m->m_session_autoclose = ceph_decode_32(p); 148c89136eaSSage Weil m->m_max_file_size = ceph_decode_64(p); 149c89136eaSSage Weil m->m_max_mds = ceph_decode_32(p); 1504d7ace02SXiubo Li 1514d7ace02SXiubo Li /* 152b38c9eb4SXiubo Li * pick out the active nodes as the m_num_active_mds, the 153b38c9eb4SXiubo Li * m_num_active_mds maybe larger than m_max_mds when decreasing 154b38c9eb4SXiubo Li * the max_mds in cluster side, in other case it should less 155b38c9eb4SXiubo Li * than or equal to m_max_mds. 1564d7ace02SXiubo Li */ 157b38c9eb4SXiubo Li m->m_num_active_mds = n = ceph_decode_32(p); 1584d7ace02SXiubo Li 1594d7ace02SXiubo Li /* 160b38c9eb4SXiubo Li * the possible max rank, it maybe larger than the m_num_active_mds, 1614d7ace02SXiubo Li * for example if the mds_max == 2 in the cluster, when the MDS(0) 1624d7ace02SXiubo Li * was laggy and being replaced by a new MDS, we will temporarily 1634d7ace02SXiubo Li * receive a new mds map with n_num_mds == 1 and the active MDS(1), 164b38c9eb4SXiubo Li * and the mds rank >= m_num_active_mds. 1654d7ace02SXiubo Li */ 166b38c9eb4SXiubo Li m->possible_max_rank = max(m->m_num_active_mds, m->m_max_mds); 1672f2dc053SSage Weil 168b38c9eb4SXiubo Li m->m_info = kcalloc(m->possible_max_rank, sizeof(*m->m_info), GFP_NOFS); 169d37b1d99SMarkus Elfring if (!m->m_info) 170e9e427f0SYan, Zheng goto nomem; 1712f2dc053SSage Weil 1722f2dc053SSage Weil /* pick out active nodes from mds_info (state > 0) */ 1732f2dc053SSage Weil for (i = 0; i < n; i++) { 17494045e11SSage Weil u64 global_id; 1752f2dc053SSage Weil u32 namelen; 1762f2dc053SSage Weil s32 mds, inc, state; 177d463a43dSYan, Zheng u8 info_v; 178d463a43dSYan, Zheng void *info_end = NULL; 1792f2dc053SSage Weil struct ceph_entity_addr addr; 1802f2dc053SSage Weil u32 num_export_targets; 1812f2dc053SSage Weil void *pexport_targets = NULL; 1820deb01c9SSage Weil struct ceph_timespec laggy_since; 1836af86528SDan Carpenter struct ceph_mds_info *info; 184da08e1e1SXiubo Li bool laggy; 1852f2dc053SSage Weil 186d463a43dSYan, Zheng ceph_decode_need(p, end, sizeof(u64) + 1, bad); 18794045e11SSage Weil global_id = ceph_decode_64(p); 188d463a43dSYan, Zheng info_v= ceph_decode_8(p); 189d463a43dSYan, Zheng if (info_v >= 4) { 190d463a43dSYan, Zheng u32 info_len; 191d463a43dSYan, Zheng ceph_decode_need(p, end, 1 + sizeof(u32), bad); 192*8e298debSJia Yang *p += sizeof(u8); /* info_cv */ 193d463a43dSYan, Zheng info_len = ceph_decode_32(p); 194d463a43dSYan, Zheng info_end = *p + info_len; 195d463a43dSYan, Zheng if (info_end > end) 196d463a43dSYan, Zheng goto bad; 197d463a43dSYan, Zheng } 198d463a43dSYan, Zheng 199d463a43dSYan, Zheng ceph_decode_need(p, end, sizeof(u64) + sizeof(u32), bad); 20094045e11SSage Weil *p += sizeof(u64); 201c89136eaSSage Weil namelen = ceph_decode_32(p); /* skip mds name */ 2022f2dc053SSage Weil *p += namelen; 2032f2dc053SSage Weil 2042f2dc053SSage Weil ceph_decode_need(p, end, 205e251e288SSage Weil 4*sizeof(u32) + sizeof(u64) + 2062f2dc053SSage Weil sizeof(addr) + sizeof(struct ceph_timespec), 2072f2dc053SSage Weil bad); 208c89136eaSSage Weil mds = ceph_decode_32(p); 209c89136eaSSage Weil inc = ceph_decode_32(p); 210c89136eaSSage Weil state = ceph_decode_32(p); 211*8e298debSJia Yang *p += sizeof(u64); /* state_seq */ 212f3848af1SJeff Layton err = ceph_decode_entity_addr(p, end, &addr); 213f3848af1SJeff Layton if (err) 214f3848af1SJeff Layton goto corrupt; 2150deb01c9SSage Weil ceph_decode_copy(p, &laggy_since, sizeof(laggy_since)); 216da08e1e1SXiubo Li laggy = laggy_since.tv_sec != 0 || laggy_since.tv_nsec != 0; 2172f2dc053SSage Weil *p += sizeof(u32); 2182f2dc053SSage Weil ceph_decode_32_safe(p, end, namelen, bad); 219e251e288SSage Weil *p += namelen; 220d463a43dSYan, Zheng if (info_v >= 2) { 2212f2dc053SSage Weil ceph_decode_32_safe(p, end, num_export_targets, bad); 2222f2dc053SSage Weil pexport_targets = *p; 223e251e288SSage Weil *p += num_export_targets * sizeof(u32); 2242f2dc053SSage Weil } else { 2252f2dc053SSage Weil num_export_targets = 0; 2262f2dc053SSage Weil } 2272f2dc053SSage Weil 228d463a43dSYan, Zheng if (info_end && *p != info_end) { 229d463a43dSYan, Zheng if (*p > info_end) 230d463a43dSYan, Zheng goto bad; 231d463a43dSYan, Zheng *p = info_end; 232d463a43dSYan, Zheng } 233d463a43dSYan, Zheng 234da08e1e1SXiubo Li dout("mdsmap_decode %d/%d %lld mds%d.%d %s %s%s\n", 2353d14c5d2SYehuda Sadeh i+1, n, global_id, mds, inc, 236b726ec97SJeff Layton ceph_pr_addr(&addr), 237da08e1e1SXiubo Li ceph_mds_state_name(state), 238da08e1e1SXiubo Li laggy ? "(laggy)" : ""); 2396af86528SDan Carpenter 240b38c9eb4SXiubo Li if (mds < 0 || mds >= m->possible_max_rank) { 2414d7ace02SXiubo Li pr_warn("mdsmap_decode got incorrect mds(%d)\n", mds); 2426af86528SDan Carpenter continue; 2434d7ace02SXiubo Li } 2446af86528SDan Carpenter 2454d7ace02SXiubo Li if (state <= 0) { 2464d7ace02SXiubo Li pr_warn("mdsmap_decode got incorrect state(%s)\n", 2474d7ace02SXiubo Li ceph_mds_state_name(state)); 2484d7ace02SXiubo Li continue; 24976201b63SYan, Zheng } 25076201b63SYan, Zheng 2516af86528SDan Carpenter info = &m->m_info[mds]; 2526af86528SDan Carpenter info->global_id = global_id; 2536af86528SDan Carpenter info->state = state; 2546af86528SDan Carpenter info->addr = addr; 255da08e1e1SXiubo Li info->laggy = laggy; 2566af86528SDan Carpenter info->num_export_targets = num_export_targets; 2572f2dc053SSage Weil if (num_export_targets) { 2586af86528SDan Carpenter info->export_targets = kcalloc(num_export_targets, 2596af86528SDan Carpenter sizeof(u32), GFP_NOFS); 260d37b1d99SMarkus Elfring if (!info->export_targets) 261e9e427f0SYan, Zheng goto nomem; 2622f2dc053SSage Weil for (j = 0; j < num_export_targets; j++) 2636af86528SDan Carpenter info->export_targets[j] = 264c89136eaSSage Weil ceph_decode_32(&pexport_targets); 2652f2dc053SSage Weil } else { 2666af86528SDan Carpenter info->export_targets = NULL; 2672f2dc053SSage Weil } 2682f2dc053SSage Weil } 2692f2dc053SSage Weil 2702f2dc053SSage Weil /* pg_pools */ 2712f2dc053SSage Weil ceph_decode_32_safe(p, end, n, bad); 2722f2dc053SSage Weil m->m_num_data_pg_pools = n; 2734f6a7e5eSSage Weil m->m_data_pg_pools = kcalloc(n, sizeof(u64), GFP_NOFS); 2742f2dc053SSage Weil if (!m->m_data_pg_pools) 275e9e427f0SYan, Zheng goto nomem; 2764f6a7e5eSSage Weil ceph_decode_need(p, end, sizeof(u64)*(n+1), bad); 2772f2dc053SSage Weil for (i = 0; i < n; i++) 2784f6a7e5eSSage Weil m->m_data_pg_pools[i] = ceph_decode_64(p); 2794f6a7e5eSSage Weil m->m_cas_pg_pool = ceph_decode_64(p); 280e9e427f0SYan, Zheng m->m_enabled = m->m_epoch > 1; 2812f2dc053SSage Weil 282e9e427f0SYan, Zheng mdsmap_ev = 1; 283e9e427f0SYan, Zheng if (mdsmap_v >= 2) { 284e9e427f0SYan, Zheng ceph_decode_16_safe(p, end, mdsmap_ev, bad_ext); 285e9e427f0SYan, Zheng } 286e9e427f0SYan, Zheng if (mdsmap_ev >= 3) { 287e9e427f0SYan, Zheng if (__decode_and_drop_compat_set(p, end) < 0) 288e9e427f0SYan, Zheng goto bad_ext; 289e9e427f0SYan, Zheng } 290e9e427f0SYan, Zheng /* metadata_pool */ 291e9e427f0SYan, Zheng if (mdsmap_ev < 5) { 292e9e427f0SYan, Zheng __decode_and_drop_type(p, end, u32, bad_ext); 293e9e427f0SYan, Zheng } else { 294e9e427f0SYan, Zheng __decode_and_drop_type(p, end, u64, bad_ext); 295e9e427f0SYan, Zheng } 296e9e427f0SYan, Zheng 297e9e427f0SYan, Zheng /* created + modified + tableserver */ 298e9e427f0SYan, Zheng __decode_and_drop_type(p, end, struct ceph_timespec, bad_ext); 299e9e427f0SYan, Zheng __decode_and_drop_type(p, end, struct ceph_timespec, bad_ext); 300e9e427f0SYan, Zheng __decode_and_drop_type(p, end, u32, bad_ext); 301e9e427f0SYan, Zheng 302e9e427f0SYan, Zheng /* in */ 303e9e427f0SYan, Zheng { 304e9e427f0SYan, Zheng int num_laggy = 0; 305e9e427f0SYan, Zheng ceph_decode_32_safe(p, end, n, bad_ext); 306e9e427f0SYan, Zheng ceph_decode_need(p, end, sizeof(u32) * n, bad_ext); 307e9e427f0SYan, Zheng 308e9e427f0SYan, Zheng for (i = 0; i < n; i++) { 309e9e427f0SYan, Zheng s32 mds = ceph_decode_32(p); 310b38c9eb4SXiubo Li if (mds >= 0 && mds < m->possible_max_rank) { 311e9e427f0SYan, Zheng if (m->m_info[mds].laggy) 312e9e427f0SYan, Zheng num_laggy++; 313e9e427f0SYan, Zheng } 314e9e427f0SYan, Zheng } 315e9e427f0SYan, Zheng m->m_num_laggy = num_laggy; 31676201b63SYan, Zheng 317b38c9eb4SXiubo Li if (n > m->possible_max_rank) { 31876201b63SYan, Zheng void *new_m_info = krealloc(m->m_info, 31976201b63SYan, Zheng n * sizeof(*m->m_info), 32076201b63SYan, Zheng GFP_NOFS | __GFP_ZERO); 32176201b63SYan, Zheng if (!new_m_info) 32276201b63SYan, Zheng goto nomem; 32376201b63SYan, Zheng m->m_info = new_m_info; 32476201b63SYan, Zheng } 325b38c9eb4SXiubo Li m->possible_max_rank = n; 326e9e427f0SYan, Zheng } 327e9e427f0SYan, Zheng 328e9e427f0SYan, Zheng /* inc */ 329e9e427f0SYan, Zheng __decode_and_drop_map(p, end, u32, u32, bad_ext); 330e9e427f0SYan, Zheng /* up */ 331e9e427f0SYan, Zheng __decode_and_drop_map(p, end, u32, u64, bad_ext); 332e9e427f0SYan, Zheng /* failed */ 333e9e427f0SYan, Zheng __decode_and_drop_set(p, end, u32, bad_ext); 334e9e427f0SYan, Zheng /* stopped */ 335e9e427f0SYan, Zheng __decode_and_drop_set(p, end, u32, bad_ext); 336e9e427f0SYan, Zheng 337e9e427f0SYan, Zheng if (mdsmap_ev >= 4) { 338e9e427f0SYan, Zheng /* last_failure_osd_epoch */ 339e9e427f0SYan, Zheng __decode_and_drop_type(p, end, u32, bad_ext); 340e9e427f0SYan, Zheng } 341e9e427f0SYan, Zheng if (mdsmap_ev >= 6) { 342e9e427f0SYan, Zheng /* ever_allowed_snaps */ 343e9e427f0SYan, Zheng __decode_and_drop_type(p, end, u8, bad_ext); 344e9e427f0SYan, Zheng /* explicitly_allowed_snaps */ 345e9e427f0SYan, Zheng __decode_and_drop_type(p, end, u8, bad_ext); 346e9e427f0SYan, Zheng } 347e9e427f0SYan, Zheng if (mdsmap_ev >= 7) { 348e9e427f0SYan, Zheng /* inline_data_enabled */ 349e9e427f0SYan, Zheng __decode_and_drop_type(p, end, u8, bad_ext); 350e9e427f0SYan, Zheng } 351e9e427f0SYan, Zheng if (mdsmap_ev >= 8) { 352e9e427f0SYan, Zheng u32 name_len; 353e9e427f0SYan, Zheng /* enabled */ 354e9e427f0SYan, Zheng ceph_decode_8_safe(p, end, m->m_enabled, bad_ext); 355e9e427f0SYan, Zheng ceph_decode_32_safe(p, end, name_len, bad_ext); 356e9e427f0SYan, Zheng ceph_decode_need(p, end, name_len, bad_ext); 357e9e427f0SYan, Zheng *p += name_len; 358e9e427f0SYan, Zheng } 359e9e427f0SYan, Zheng /* damaged */ 360e9e427f0SYan, Zheng if (mdsmap_ev >= 9) { 361e9e427f0SYan, Zheng size_t need; 362e9e427f0SYan, Zheng ceph_decode_32_safe(p, end, n, bad_ext); 363e9e427f0SYan, Zheng need = sizeof(u32) * n; 364e9e427f0SYan, Zheng ceph_decode_need(p, end, need, bad_ext); 365e9e427f0SYan, Zheng *p += need; 366e9e427f0SYan, Zheng m->m_damaged = n > 0; 367e9e427f0SYan, Zheng } else { 368e9e427f0SYan, Zheng m->m_damaged = false; 369e9e427f0SYan, Zheng } 370e9e427f0SYan, Zheng bad_ext: 371da08e1e1SXiubo Li dout("mdsmap_decode m_enabled: %d, m_damaged: %d, m_num_laggy: %d\n", 372da08e1e1SXiubo Li !!m->m_enabled, !!m->m_damaged, m->m_num_laggy); 373d463a43dSYan, Zheng *p = end; 3742f2dc053SSage Weil dout("mdsmap_decode success epoch %u\n", m->m_epoch); 3752f2dc053SSage Weil return m; 376e9e427f0SYan, Zheng nomem: 3772f2dc053SSage Weil err = -ENOMEM; 378e9e427f0SYan, Zheng goto out_err; 379f3848af1SJeff Layton corrupt: 3802f2dc053SSage Weil pr_err("corrupt mdsmap\n"); 3819ec7cab1SSage Weil print_hex_dump(KERN_DEBUG, "mdsmap: ", 3829ec7cab1SSage Weil DUMP_PREFIX_OFFSET, 16, 1, 3839ec7cab1SSage Weil start, end - start, true); 384e9e427f0SYan, Zheng out_err: 3852f2dc053SSage Weil ceph_mdsmap_destroy(m); 386c213b50bSEmil Goode return ERR_PTR(err); 387f3848af1SJeff Layton bad: 388f3848af1SJeff Layton err = -EINVAL; 389f3848af1SJeff Layton goto corrupt; 3902f2dc053SSage Weil } 3912f2dc053SSage Weil 3922f2dc053SSage Weil void ceph_mdsmap_destroy(struct ceph_mdsmap *m) 3932f2dc053SSage Weil { 3942f2dc053SSage Weil int i; 3952f2dc053SSage Weil 396b38c9eb4SXiubo Li for (i = 0; i < m->possible_max_rank; i++) 3972f2dc053SSage Weil kfree(m->m_info[i].export_targets); 3982f2dc053SSage Weil kfree(m->m_info); 3992f2dc053SSage Weil kfree(m->m_data_pg_pools); 4002f2dc053SSage Weil kfree(m); 4012f2dc053SSage Weil } 402e9e427f0SYan, Zheng 403e9e427f0SYan, Zheng bool ceph_mdsmap_is_cluster_available(struct ceph_mdsmap *m) 404e9e427f0SYan, Zheng { 405e9e427f0SYan, Zheng int i, nr_active = 0; 406e9e427f0SYan, Zheng if (!m->m_enabled) 407e9e427f0SYan, Zheng return false; 408e9e427f0SYan, Zheng if (m->m_damaged) 409e9e427f0SYan, Zheng return false; 4104d7ace02SXiubo Li if (m->m_num_laggy == m->m_num_active_mds) 411e9e427f0SYan, Zheng return false; 412b38c9eb4SXiubo Li for (i = 0; i < m->possible_max_rank; i++) { 413e9e427f0SYan, Zheng if (m->m_info[i].state == CEPH_MDS_STATE_ACTIVE) 414e9e427f0SYan, Zheng nr_active++; 415e9e427f0SYan, Zheng } 416e9e427f0SYan, Zheng return nr_active > 0; 417e9e427f0SYan, Zheng } 418