v4.19.13 snapshot.
diff --git a/fs/ceph/mdsmap.c b/fs/ceph/mdsmap.c
new file mode 100644
index 0000000..44e53ab
--- /dev/null
+++ b/fs/ceph/mdsmap.c
@@ -0,0 +1,396 @@
+// 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"
+
+
+/*
+ * 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 n = 0;
+ int i;
+
+ /* special case for one mds */
+ if (1 == m->m_num_mds && m->m_info[0].state > 0)
+ return 0;
+
+ /* count */
+ for (i = 0; i < m->m_num_mds; i++)
+ if (m->m_info[i].state > 0)
+ n++;
+ if (n == 0)
+ return -1;
+
+ /* pick */
+ n = prandom_u32() % n;
+ i = 0;
+ for (i = 0; n > 0; i++, n--)
+ while (m->m_info[i].state <= 0)
+ i++;
+
+ return i;
+}
+
+#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)
+{
+ struct ceph_mdsmap *m;
+ const void *start = *p;
+ int i, j, n;
+ int err = -EINVAL;
+ u8 mdsmap_v, mdsmap_cv;
+ u16 mdsmap_ev;
+
+ 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);
+ mdsmap_cv = ceph_decode_8(p);
+ 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);
+ m->m_num_mds = m->m_max_mds;
+
+ m->m_info = kcalloc(m->m_num_mds, sizeof(*m->m_info), GFP_NOFS);
+ if (!m->m_info)
+ goto nomem;
+
+ /* pick out active nodes from mds_info (state > 0) */
+ n = ceph_decode_32(p);
+ for (i = 0; i < n; i++) {
+ u64 global_id;
+ u32 namelen;
+ s32 mds, inc, state;
+ u64 state_seq;
+ 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;
+
+ 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;
+ u8 info_cv;
+ ceph_decode_need(p, end, 1 + sizeof(u32), bad);
+ info_cv = ceph_decode_8(p);
+ 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_need(p, end,
+ 4*sizeof(u32) + sizeof(u64) +
+ sizeof(addr) + sizeof(struct ceph_timespec),
+ bad);
+ mds = ceph_decode_32(p);
+ inc = ceph_decode_32(p);
+ state = ceph_decode_32(p);
+ state_seq = ceph_decode_64(p);
+ ceph_decode_copy(p, &addr, sizeof(addr));
+ ceph_decode_addr(&addr);
+ ceph_decode_copy(p, &laggy_since, sizeof(laggy_since));
+ *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\n",
+ i+1, n, global_id, mds, inc,
+ ceph_pr_addr(&addr.in_addr),
+ ceph_mds_state_name(state));
+
+ 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;
+ info->addr = addr;
+ info->laggy = (laggy_since.tv_sec != 0 ||
+ laggy_since.tv_nsec != 0);
+ 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++)
+ info->export_targets[j] =
+ ceph_decode_32(&pexport_targets);
+ } else {
+ 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);
+ 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->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 */
+ __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) {
+ u32 name_len;
+ /* enabled */
+ ceph_decode_8_safe(p, end, m->m_enabled, bad_ext);
+ ceph_decode_32_safe(p, end, name_len, bad_ext);
+ ceph_decode_need(p, end, name_len, bad_ext);
+ *p += name_len;
+ }
+ /* 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;
+ }
+bad_ext:
+ *p = end;
+ dout("mdsmap_decode success epoch %u\n", m->m_epoch);
+ return m;
+nomem:
+ err = -ENOMEM;
+ goto out_err;
+bad:
+ 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);
+}
+
+void ceph_mdsmap_destroy(struct ceph_mdsmap *m)
+{
+ int 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);
+ 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 > 0)
+ return false;
+ for (i = 0; i < m->m_num_mds; i++) {
+ if (m->m_info[i].state == CEPH_MDS_STATE_ACTIVE)
+ nr_active++;
+ }
+ return nr_active > 0;
+}