diff options
Diffstat (limited to 'fs/ceph/mdsmap.c')
| -rw-r--r-- | fs/ceph/mdsmap.c | 436 |
1 files changed, 436 insertions, 0 deletions
diff --git a/fs/ceph/mdsmap.c b/fs/ceph/mdsmap.c new file mode 100644 index 0000000000..7dac21ee6c --- /dev/null +++ b/fs/ceph/mdsmap.c @@ -0,0 +1,436 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <linux/ceph/ceph_debug.h> + +#include <linux/bug.h> +#include <linux/err.h> +#include <linux/random.h> +#include <linux/slab.h> +#include <linux/types.h> + +#include <linux/ceph/mdsmap.h> +#include <linux/ceph/messenger.h> +#include <linux/ceph/decode.h> + +#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) + +static int __mdsmap_get_random_mds(struct ceph_mdsmap *m, bool ignore_laggy) +{ + int n = 0; + int i, j; + + /* count */ + for (i = 0; i < m->possible_max_rank; i++) + if (CEPH_MDS_IS_READY(i, ignore_laggy)) + n++; + if (n == 0) + return -1; + + /* pick */ + n = get_random_u32_below(n); + for (j = 0, i = 0; i < m->possible_max_rank; i++) { + if (CEPH_MDS_IS_READY(i, ignore_laggy)) + j++; + if (j > n) + break; + } + + return i; +} + +/* + * choose a random mds that is "up" (i.e. has a state > 0), or -1. + */ +int ceph_mdsmap_get_random_mds(struct ceph_mdsmap *m) +{ + int mds; + + mds = __mdsmap_get_random_mds(m, false); + if (mds == m->possible_max_rank || mds == -1) + mds = __mdsmap_get_random_mds(m, true); + + return mds == m->possible_max_rank ? -1 : mds; +} + +#define __decode_and_drop_type(p, end, type, bad) \ + do { \ + if (*p + sizeof(type) > end) \ + goto bad; \ + *p += sizeof(type); \ + } while (0) + +#define __decode_and_drop_set(p, end, type, bad) \ + do { \ + u32 n; \ + size_t need; \ + ceph_decode_32_safe(p, end, n, bad); \ + need = sizeof(type) * n; \ + ceph_decode_need(p, end, need, bad); \ + *p += need; \ + } while (0) + +#define __decode_and_drop_map(p, end, ktype, vtype, bad) \ + do { \ + u32 n; \ + size_t need; \ + ceph_decode_32_safe(p, end, n, bad); \ + need = (sizeof(ktype) + sizeof(vtype)) * n; \ + ceph_decode_need(p, end, need, bad); \ + *p += need; \ + } while (0) + + +static int __decode_and_drop_compat_set(void **p, void* end) +{ + int i; + /* compat, ro_compat, incompat*/ + for (i = 0; i < 3; i++) { + u32 n; + ceph_decode_need(p, end, sizeof(u64) + sizeof(u32), bad); + /* mask */ + *p += sizeof(u64); + /* names (map<u64, string>) */ + n = ceph_decode_32(p); + while (n-- > 0) { + u32 len; + ceph_decode_need(p, end, sizeof(u64) + sizeof(u32), + bad); + *p += sizeof(u64); + len = ceph_decode_32(p); + ceph_decode_need(p, end, len, bad); + *p += len; + } + } + return 0; +bad: + return -1; +} + +/* + * Decode an MDS map + * + * Ignore any fields we don't care about (there are quite a few of + * them). + */ +struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end, bool msgr2) +{ + struct ceph_mdsmap *m; + const void *start = *p; + int i, j, n; + int err; + u8 mdsmap_v; + u16 mdsmap_ev; + u32 target; + + m = kzalloc(sizeof(*m), GFP_NOFS); + if (!m) + return ERR_PTR(-ENOMEM); + + ceph_decode_need(p, end, 1 + 1, bad); + mdsmap_v = ceph_decode_8(p); + *p += sizeof(u8); /* mdsmap_cv */ + if (mdsmap_v >= 4) { + u32 mdsmap_len; + ceph_decode_32_safe(p, end, mdsmap_len, bad); + if (end < *p + mdsmap_len) + goto bad; + end = *p + mdsmap_len; + } + + ceph_decode_need(p, end, 8*sizeof(u32) + sizeof(u64), bad); + m->m_epoch = ceph_decode_32(p); + m->m_client_epoch = ceph_decode_32(p); + m->m_last_failure = ceph_decode_32(p); + m->m_root = ceph_decode_32(p); + m->m_session_timeout = ceph_decode_32(p); + 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); + + /* + * pick out the active nodes as the m_num_active_mds, the + * m_num_active_mds maybe larger than m_max_mds when decreasing + * the max_mds in cluster side, in other case it should less + * than or equal to m_max_mds. + */ + m->m_num_active_mds = n = ceph_decode_32(p); + + /* + * the possible max rank, it maybe larger than the m_num_active_mds, + * for example if the mds_max == 2 in the cluster, when the MDS(0) + * was laggy and being replaced by a new MDS, we will temporarily + * receive a new mds map with n_num_mds == 1 and the active MDS(1), + * and the mds rank >= m_num_active_mds. + */ + m->possible_max_rank = max(m->m_num_active_mds, m->m_max_mds); + + m->m_info = kcalloc(m->possible_max_rank, sizeof(*m->m_info), GFP_NOFS); + if (!m->m_info) + goto nomem; + + /* pick out active nodes from mds_info (state > 0) */ + for (i = 0; i < n; i++) { + u64 global_id; + u32 namelen; + s32 mds, inc, state; + u8 info_v; + void *info_end = NULL; + struct ceph_entity_addr addr; + u32 num_export_targets; + void *pexport_targets = NULL; + struct ceph_timespec laggy_since; + struct ceph_mds_info *info; + bool laggy; + + ceph_decode_need(p, end, sizeof(u64) + 1, bad); + global_id = ceph_decode_64(p); + info_v= ceph_decode_8(p); + if (info_v >= 4) { + u32 info_len; + ceph_decode_need(p, end, 1 + sizeof(u32), bad); + *p += sizeof(u8); /* info_cv */ + info_len = ceph_decode_32(p); + info_end = *p + info_len; + if (info_end > end) + goto bad; + } + + ceph_decode_need(p, end, sizeof(u64) + sizeof(u32), bad); + *p += sizeof(u64); + namelen = ceph_decode_32(p); /* skip mds name */ + *p += namelen; + + ceph_decode_32_safe(p, end, mds, bad); + ceph_decode_32_safe(p, end, inc, bad); + ceph_decode_32_safe(p, end, state, bad); + *p += sizeof(u64); /* state_seq */ + if (info_v >= 8) + err = ceph_decode_entity_addrvec(p, end, msgr2, &addr); + else + err = ceph_decode_entity_addr(p, end, &addr); + if (err) + goto corrupt; + + ceph_decode_copy_safe(p, end, &laggy_since, sizeof(laggy_since), + bad); + laggy = laggy_since.tv_sec != 0 || laggy_since.tv_nsec != 0; + *p += sizeof(u32); + ceph_decode_32_safe(p, end, namelen, bad); + *p += namelen; + if (info_v >= 2) { + ceph_decode_32_safe(p, end, num_export_targets, bad); + pexport_targets = *p; + *p += num_export_targets * sizeof(u32); + } else { + num_export_targets = 0; + } + + if (info_end && *p != info_end) { + if (*p > info_end) + goto bad; + *p = info_end; + } + + dout("mdsmap_decode %d/%d %lld mds%d.%d %s %s%s\n", + i+1, n, global_id, mds, inc, + ceph_pr_addr(&addr), + ceph_mds_state_name(state), + laggy ? "(laggy)" : ""); + + if (mds < 0 || mds >= m->possible_max_rank) { + pr_warn("mdsmap_decode got incorrect mds(%d)\n", mds); + continue; + } + + if (state <= 0) { + dout("mdsmap_decode got incorrect state(%s)\n", + ceph_mds_state_name(state)); + continue; + } + + info = &m->m_info[mds]; + info->global_id = global_id; + info->state = state; + info->addr = addr; + info->laggy = laggy; + info->num_export_targets = num_export_targets; + if (num_export_targets) { + info->export_targets = kcalloc(num_export_targets, + sizeof(u32), GFP_NOFS); + if (!info->export_targets) + goto nomem; + for (j = 0; j < num_export_targets; j++) { + target = ceph_decode_32(&pexport_targets); + info->export_targets[j] = target; + } + } else { + info->export_targets = NULL; + } + } + + /* pg_pools */ + ceph_decode_32_safe(p, end, n, bad); + m->m_num_data_pg_pools = n; + m->m_data_pg_pools = kcalloc(n, sizeof(u64), GFP_NOFS); + if (!m->m_data_pg_pools) + goto nomem; + ceph_decode_need(p, end, sizeof(u64)*(n+1), bad); + for (i = 0; i < n; i++) + m->m_data_pg_pools[i] = ceph_decode_64(p); + m->m_cas_pg_pool = ceph_decode_64(p); + m->m_enabled = m->m_epoch > 1; + + mdsmap_ev = 1; + if (mdsmap_v >= 2) { + ceph_decode_16_safe(p, end, mdsmap_ev, bad_ext); + } + if (mdsmap_ev >= 3) { + if (__decode_and_drop_compat_set(p, end) < 0) + goto bad_ext; + } + /* metadata_pool */ + if (mdsmap_ev < 5) { + __decode_and_drop_type(p, end, u32, bad_ext); + } else { + __decode_and_drop_type(p, end, u64, bad_ext); + } + + /* created + modified + tableserver */ + __decode_and_drop_type(p, end, struct ceph_timespec, bad_ext); + __decode_and_drop_type(p, end, struct ceph_timespec, bad_ext); + __decode_and_drop_type(p, end, u32, bad_ext); + + /* in */ + { + int num_laggy = 0; + ceph_decode_32_safe(p, end, n, bad_ext); + ceph_decode_need(p, end, sizeof(u32) * n, bad_ext); + + for (i = 0; i < n; i++) { + s32 mds = ceph_decode_32(p); + if (mds >= 0 && mds < m->possible_max_rank) { + if (m->m_info[mds].laggy) + num_laggy++; + } + } + m->m_num_laggy = num_laggy; + + if (n > m->possible_max_rank) { + 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->possible_max_rank = n; + } + + /* inc */ + __decode_and_drop_map(p, end, u32, u32, bad_ext); + /* up */ + __decode_and_drop_map(p, end, u32, u64, bad_ext); + /* failed */ + __decode_and_drop_set(p, end, u32, bad_ext); + /* stopped */ + __decode_and_drop_set(p, end, u32, bad_ext); + + if (mdsmap_ev >= 4) { + /* last_failure_osd_epoch */ + __decode_and_drop_type(p, end, u32, bad_ext); + } + if (mdsmap_ev >= 6) { + /* ever_allowed_snaps */ + __decode_and_drop_type(p, end, u8, bad_ext); + /* explicitly_allowed_snaps */ + __decode_and_drop_type(p, end, u8, bad_ext); + } + if (mdsmap_ev >= 7) { + /* inline_data_enabled */ + __decode_and_drop_type(p, end, u8, bad_ext); + } + if (mdsmap_ev >= 8) { + /* enabled */ + ceph_decode_8_safe(p, end, m->m_enabled, bad_ext); + /* fs_name */ + ceph_decode_skip_string(p, end, bad_ext); + } + /* damaged */ + if (mdsmap_ev >= 9) { + size_t need; + ceph_decode_32_safe(p, end, n, bad_ext); + need = sizeof(u32) * n; + ceph_decode_need(p, end, need, bad_ext); + *p += need; + m->m_damaged = n > 0; + } else { + m->m_damaged = false; + } + if (mdsmap_ev >= 17) { + /* balancer */ + ceph_decode_skip_string(p, end, bad_ext); + /* standby_count_wanted */ + ceph_decode_skip_32(p, end, bad_ext); + /* old_max_mds */ + ceph_decode_skip_32(p, end, bad_ext); + /* min_compat_client */ + ceph_decode_skip_8(p, end, bad_ext); + /* required_client_features */ + ceph_decode_skip_set(p, end, 64, bad_ext); + ceph_decode_64_safe(p, end, m->m_max_xattr_size, bad_ext); + } else { + /* This forces the usage of the (sync) SETXATTR Op */ + m->m_max_xattr_size = 0; + } +bad_ext: + dout("mdsmap_decode m_enabled: %d, m_damaged: %d, m_num_laggy: %d\n", + !!m->m_enabled, !!m->m_damaged, m->m_num_laggy); + *p = end; + dout("mdsmap_decode success epoch %u\n", m->m_epoch); + return m; +nomem: + err = -ENOMEM; + goto out_err; +corrupt: + pr_err("corrupt mdsmap\n"); + print_hex_dump(KERN_DEBUG, "mdsmap: ", + DUMP_PREFIX_OFFSET, 16, 1, + start, end - start, true); +out_err: + ceph_mdsmap_destroy(m); + return ERR_PTR(err); +bad: + err = -EINVAL; + goto corrupt; +} + +void ceph_mdsmap_destroy(struct ceph_mdsmap *m) +{ + int i; + + if (m->m_info) { + for (i = 0; i < m->possible_max_rank; i++) + kfree(m->m_info[i].export_targets); + kfree(m->m_info); + } + kfree(m->m_data_pg_pools); + kfree(m); +} + +bool ceph_mdsmap_is_cluster_available(struct ceph_mdsmap *m) +{ + int i, nr_active = 0; + if (!m->m_enabled) + return false; + if (m->m_damaged) + return false; + if (m->m_num_laggy == m->m_num_active_mds) + return false; + for (i = 0; i < m->possible_max_rank; i++) { + if (m->m_info[i].state == CEPH_MDS_STATE_ACTIVE) + nr_active++; + } + return nr_active > 0; +} |