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-rw-r--r--net/ceph/osdmap.c3106
1 files changed, 3106 insertions, 0 deletions
diff --git a/net/ceph/osdmap.c b/net/ceph/osdmap.c
new file mode 100644
index 0000000000..2950988738
--- /dev/null
+++ b/net/ceph/osdmap.c
@@ -0,0 +1,3106 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/ceph/ceph_debug.h>
+
+#include <linux/module.h>
+#include <linux/slab.h>
+
+#include <linux/ceph/libceph.h>
+#include <linux/ceph/osdmap.h>
+#include <linux/ceph/decode.h>
+#include <linux/crush/hash.h>
+#include <linux/crush/mapper.h>
+
+static __printf(2, 3)
+void osdmap_info(const struct ceph_osdmap *map, const char *fmt, ...)
+{
+ struct va_format vaf;
+ va_list args;
+
+ va_start(args, fmt);
+ vaf.fmt = fmt;
+ vaf.va = &args;
+
+ printk(KERN_INFO "%s (%pU e%u): %pV", KBUILD_MODNAME, &map->fsid,
+ map->epoch, &vaf);
+
+ va_end(args);
+}
+
+char *ceph_osdmap_state_str(char *str, int len, u32 state)
+{
+ if (!len)
+ return str;
+
+ if ((state & CEPH_OSD_EXISTS) && (state & CEPH_OSD_UP))
+ snprintf(str, len, "exists, up");
+ else if (state & CEPH_OSD_EXISTS)
+ snprintf(str, len, "exists");
+ else if (state & CEPH_OSD_UP)
+ snprintf(str, len, "up");
+ else
+ snprintf(str, len, "doesn't exist");
+
+ return str;
+}
+
+/* maps */
+
+static int calc_bits_of(unsigned int t)
+{
+ int b = 0;
+ while (t) {
+ t = t >> 1;
+ b++;
+ }
+ return b;
+}
+
+/*
+ * the foo_mask is the smallest value 2^n-1 that is >= foo.
+ */
+static void calc_pg_masks(struct ceph_pg_pool_info *pi)
+{
+ pi->pg_num_mask = (1 << calc_bits_of(pi->pg_num-1)) - 1;
+ pi->pgp_num_mask = (1 << calc_bits_of(pi->pgp_num-1)) - 1;
+}
+
+/*
+ * decode crush map
+ */
+static int crush_decode_uniform_bucket(void **p, void *end,
+ struct crush_bucket_uniform *b)
+{
+ dout("crush_decode_uniform_bucket %p to %p\n", *p, end);
+ ceph_decode_need(p, end, (1+b->h.size) * sizeof(u32), bad);
+ b->item_weight = ceph_decode_32(p);
+ return 0;
+bad:
+ return -EINVAL;
+}
+
+static int crush_decode_list_bucket(void **p, void *end,
+ struct crush_bucket_list *b)
+{
+ int j;
+ dout("crush_decode_list_bucket %p to %p\n", *p, end);
+ b->item_weights = kcalloc(b->h.size, sizeof(u32), GFP_NOFS);
+ if (b->item_weights == NULL)
+ return -ENOMEM;
+ b->sum_weights = kcalloc(b->h.size, sizeof(u32), GFP_NOFS);
+ if (b->sum_weights == NULL)
+ return -ENOMEM;
+ ceph_decode_need(p, end, 2 * b->h.size * sizeof(u32), bad);
+ for (j = 0; j < b->h.size; j++) {
+ b->item_weights[j] = ceph_decode_32(p);
+ b->sum_weights[j] = ceph_decode_32(p);
+ }
+ return 0;
+bad:
+ return -EINVAL;
+}
+
+static int crush_decode_tree_bucket(void **p, void *end,
+ struct crush_bucket_tree *b)
+{
+ int j;
+ dout("crush_decode_tree_bucket %p to %p\n", *p, end);
+ ceph_decode_8_safe(p, end, b->num_nodes, bad);
+ b->node_weights = kcalloc(b->num_nodes, sizeof(u32), GFP_NOFS);
+ if (b->node_weights == NULL)
+ return -ENOMEM;
+ ceph_decode_need(p, end, b->num_nodes * sizeof(u32), bad);
+ for (j = 0; j < b->num_nodes; j++)
+ b->node_weights[j] = ceph_decode_32(p);
+ return 0;
+bad:
+ return -EINVAL;
+}
+
+static int crush_decode_straw_bucket(void **p, void *end,
+ struct crush_bucket_straw *b)
+{
+ int j;
+ dout("crush_decode_straw_bucket %p to %p\n", *p, end);
+ b->item_weights = kcalloc(b->h.size, sizeof(u32), GFP_NOFS);
+ if (b->item_weights == NULL)
+ return -ENOMEM;
+ b->straws = kcalloc(b->h.size, sizeof(u32), GFP_NOFS);
+ if (b->straws == NULL)
+ return -ENOMEM;
+ ceph_decode_need(p, end, 2 * b->h.size * sizeof(u32), bad);
+ for (j = 0; j < b->h.size; j++) {
+ b->item_weights[j] = ceph_decode_32(p);
+ b->straws[j] = ceph_decode_32(p);
+ }
+ return 0;
+bad:
+ return -EINVAL;
+}
+
+static int crush_decode_straw2_bucket(void **p, void *end,
+ struct crush_bucket_straw2 *b)
+{
+ int j;
+ dout("crush_decode_straw2_bucket %p to %p\n", *p, end);
+ b->item_weights = kcalloc(b->h.size, sizeof(u32), GFP_NOFS);
+ if (b->item_weights == NULL)
+ return -ENOMEM;
+ ceph_decode_need(p, end, b->h.size * sizeof(u32), bad);
+ for (j = 0; j < b->h.size; j++)
+ b->item_weights[j] = ceph_decode_32(p);
+ return 0;
+bad:
+ return -EINVAL;
+}
+
+struct crush_name_node {
+ struct rb_node cn_node;
+ int cn_id;
+ char cn_name[];
+};
+
+static struct crush_name_node *alloc_crush_name(size_t name_len)
+{
+ struct crush_name_node *cn;
+
+ cn = kmalloc(sizeof(*cn) + name_len + 1, GFP_NOIO);
+ if (!cn)
+ return NULL;
+
+ RB_CLEAR_NODE(&cn->cn_node);
+ return cn;
+}
+
+static void free_crush_name(struct crush_name_node *cn)
+{
+ WARN_ON(!RB_EMPTY_NODE(&cn->cn_node));
+
+ kfree(cn);
+}
+
+DEFINE_RB_FUNCS(crush_name, struct crush_name_node, cn_id, cn_node)
+
+static int decode_crush_names(void **p, void *end, struct rb_root *root)
+{
+ u32 n;
+
+ ceph_decode_32_safe(p, end, n, e_inval);
+ while (n--) {
+ struct crush_name_node *cn;
+ int id;
+ u32 name_len;
+
+ ceph_decode_32_safe(p, end, id, e_inval);
+ ceph_decode_32_safe(p, end, name_len, e_inval);
+ ceph_decode_need(p, end, name_len, e_inval);
+
+ cn = alloc_crush_name(name_len);
+ if (!cn)
+ return -ENOMEM;
+
+ cn->cn_id = id;
+ memcpy(cn->cn_name, *p, name_len);
+ cn->cn_name[name_len] = '\0';
+ *p += name_len;
+
+ if (!__insert_crush_name(root, cn)) {
+ free_crush_name(cn);
+ return -EEXIST;
+ }
+ }
+
+ return 0;
+
+e_inval:
+ return -EINVAL;
+}
+
+void clear_crush_names(struct rb_root *root)
+{
+ while (!RB_EMPTY_ROOT(root)) {
+ struct crush_name_node *cn =
+ rb_entry(rb_first(root), struct crush_name_node, cn_node);
+
+ erase_crush_name(root, cn);
+ free_crush_name(cn);
+ }
+}
+
+static struct crush_choose_arg_map *alloc_choose_arg_map(void)
+{
+ struct crush_choose_arg_map *arg_map;
+
+ arg_map = kzalloc(sizeof(*arg_map), GFP_NOIO);
+ if (!arg_map)
+ return NULL;
+
+ RB_CLEAR_NODE(&arg_map->node);
+ return arg_map;
+}
+
+static void free_choose_arg_map(struct crush_choose_arg_map *arg_map)
+{
+ if (arg_map) {
+ int i, j;
+
+ WARN_ON(!RB_EMPTY_NODE(&arg_map->node));
+
+ for (i = 0; i < arg_map->size; i++) {
+ struct crush_choose_arg *arg = &arg_map->args[i];
+
+ for (j = 0; j < arg->weight_set_size; j++)
+ kfree(arg->weight_set[j].weights);
+ kfree(arg->weight_set);
+ kfree(arg->ids);
+ }
+ kfree(arg_map->args);
+ kfree(arg_map);
+ }
+}
+
+DEFINE_RB_FUNCS(choose_arg_map, struct crush_choose_arg_map, choose_args_index,
+ node);
+
+void clear_choose_args(struct crush_map *c)
+{
+ while (!RB_EMPTY_ROOT(&c->choose_args)) {
+ struct crush_choose_arg_map *arg_map =
+ rb_entry(rb_first(&c->choose_args),
+ struct crush_choose_arg_map, node);
+
+ erase_choose_arg_map(&c->choose_args, arg_map);
+ free_choose_arg_map(arg_map);
+ }
+}
+
+static u32 *decode_array_32_alloc(void **p, void *end, u32 *plen)
+{
+ u32 *a = NULL;
+ u32 len;
+ int ret;
+
+ ceph_decode_32_safe(p, end, len, e_inval);
+ if (len) {
+ u32 i;
+
+ a = kmalloc_array(len, sizeof(u32), GFP_NOIO);
+ if (!a) {
+ ret = -ENOMEM;
+ goto fail;
+ }
+
+ ceph_decode_need(p, end, len * sizeof(u32), e_inval);
+ for (i = 0; i < len; i++)
+ a[i] = ceph_decode_32(p);
+ }
+
+ *plen = len;
+ return a;
+
+e_inval:
+ ret = -EINVAL;
+fail:
+ kfree(a);
+ return ERR_PTR(ret);
+}
+
+/*
+ * Assumes @arg is zero-initialized.
+ */
+static int decode_choose_arg(void **p, void *end, struct crush_choose_arg *arg)
+{
+ int ret;
+
+ ceph_decode_32_safe(p, end, arg->weight_set_size, e_inval);
+ if (arg->weight_set_size) {
+ u32 i;
+
+ arg->weight_set = kmalloc_array(arg->weight_set_size,
+ sizeof(*arg->weight_set),
+ GFP_NOIO);
+ if (!arg->weight_set)
+ return -ENOMEM;
+
+ for (i = 0; i < arg->weight_set_size; i++) {
+ struct crush_weight_set *w = &arg->weight_set[i];
+
+ w->weights = decode_array_32_alloc(p, end, &w->size);
+ if (IS_ERR(w->weights)) {
+ ret = PTR_ERR(w->weights);
+ w->weights = NULL;
+ return ret;
+ }
+ }
+ }
+
+ arg->ids = decode_array_32_alloc(p, end, &arg->ids_size);
+ if (IS_ERR(arg->ids)) {
+ ret = PTR_ERR(arg->ids);
+ arg->ids = NULL;
+ return ret;
+ }
+
+ return 0;
+
+e_inval:
+ return -EINVAL;
+}
+
+static int decode_choose_args(void **p, void *end, struct crush_map *c)
+{
+ struct crush_choose_arg_map *arg_map = NULL;
+ u32 num_choose_arg_maps, num_buckets;
+ int ret;
+
+ ceph_decode_32_safe(p, end, num_choose_arg_maps, e_inval);
+ while (num_choose_arg_maps--) {
+ arg_map = alloc_choose_arg_map();
+ if (!arg_map) {
+ ret = -ENOMEM;
+ goto fail;
+ }
+
+ ceph_decode_64_safe(p, end, arg_map->choose_args_index,
+ e_inval);
+ arg_map->size = c->max_buckets;
+ arg_map->args = kcalloc(arg_map->size, sizeof(*arg_map->args),
+ GFP_NOIO);
+ if (!arg_map->args) {
+ ret = -ENOMEM;
+ goto fail;
+ }
+
+ ceph_decode_32_safe(p, end, num_buckets, e_inval);
+ while (num_buckets--) {
+ struct crush_choose_arg *arg;
+ u32 bucket_index;
+
+ ceph_decode_32_safe(p, end, bucket_index, e_inval);
+ if (bucket_index >= arg_map->size)
+ goto e_inval;
+
+ arg = &arg_map->args[bucket_index];
+ ret = decode_choose_arg(p, end, arg);
+ if (ret)
+ goto fail;
+
+ if (arg->ids_size &&
+ arg->ids_size != c->buckets[bucket_index]->size)
+ goto e_inval;
+ }
+
+ insert_choose_arg_map(&c->choose_args, arg_map);
+ }
+
+ return 0;
+
+e_inval:
+ ret = -EINVAL;
+fail:
+ free_choose_arg_map(arg_map);
+ return ret;
+}
+
+static void crush_finalize(struct crush_map *c)
+{
+ __s32 b;
+
+ /* Space for the array of pointers to per-bucket workspace */
+ c->working_size = sizeof(struct crush_work) +
+ c->max_buckets * sizeof(struct crush_work_bucket *);
+
+ for (b = 0; b < c->max_buckets; b++) {
+ if (!c->buckets[b])
+ continue;
+
+ switch (c->buckets[b]->alg) {
+ default:
+ /*
+ * The base case, permutation variables and
+ * the pointer to the permutation array.
+ */
+ c->working_size += sizeof(struct crush_work_bucket);
+ break;
+ }
+ /* Every bucket has a permutation array. */
+ c->working_size += c->buckets[b]->size * sizeof(__u32);
+ }
+}
+
+static struct crush_map *crush_decode(void *pbyval, void *end)
+{
+ struct crush_map *c;
+ int err;
+ int i, j;
+ void **p = &pbyval;
+ void *start = pbyval;
+ u32 magic;
+
+ dout("crush_decode %p to %p len %d\n", *p, end, (int)(end - *p));
+
+ c = kzalloc(sizeof(*c), GFP_NOFS);
+ if (c == NULL)
+ return ERR_PTR(-ENOMEM);
+
+ c->type_names = RB_ROOT;
+ c->names = RB_ROOT;
+ c->choose_args = RB_ROOT;
+
+ /* set tunables to default values */
+ c->choose_local_tries = 2;
+ c->choose_local_fallback_tries = 5;
+ c->choose_total_tries = 19;
+ c->chooseleaf_descend_once = 0;
+
+ ceph_decode_need(p, end, 4*sizeof(u32), bad);
+ magic = ceph_decode_32(p);
+ if (magic != CRUSH_MAGIC) {
+ pr_err("crush_decode magic %x != current %x\n",
+ (unsigned int)magic, (unsigned int)CRUSH_MAGIC);
+ goto bad;
+ }
+ c->max_buckets = ceph_decode_32(p);
+ c->max_rules = ceph_decode_32(p);
+ c->max_devices = ceph_decode_32(p);
+
+ c->buckets = kcalloc(c->max_buckets, sizeof(*c->buckets), GFP_NOFS);
+ if (c->buckets == NULL)
+ goto badmem;
+ c->rules = kcalloc(c->max_rules, sizeof(*c->rules), GFP_NOFS);
+ if (c->rules == NULL)
+ goto badmem;
+
+ /* buckets */
+ for (i = 0; i < c->max_buckets; i++) {
+ int size = 0;
+ u32 alg;
+ struct crush_bucket *b;
+
+ ceph_decode_32_safe(p, end, alg, bad);
+ if (alg == 0) {
+ c->buckets[i] = NULL;
+ continue;
+ }
+ dout("crush_decode bucket %d off %x %p to %p\n",
+ i, (int)(*p-start), *p, end);
+
+ switch (alg) {
+ case CRUSH_BUCKET_UNIFORM:
+ size = sizeof(struct crush_bucket_uniform);
+ break;
+ case CRUSH_BUCKET_LIST:
+ size = sizeof(struct crush_bucket_list);
+ break;
+ case CRUSH_BUCKET_TREE:
+ size = sizeof(struct crush_bucket_tree);
+ break;
+ case CRUSH_BUCKET_STRAW:
+ size = sizeof(struct crush_bucket_straw);
+ break;
+ case CRUSH_BUCKET_STRAW2:
+ size = sizeof(struct crush_bucket_straw2);
+ break;
+ default:
+ goto bad;
+ }
+ BUG_ON(size == 0);
+ b = c->buckets[i] = kzalloc(size, GFP_NOFS);
+ if (b == NULL)
+ goto badmem;
+
+ ceph_decode_need(p, end, 4*sizeof(u32), bad);
+ b->id = ceph_decode_32(p);
+ b->type = ceph_decode_16(p);
+ b->alg = ceph_decode_8(p);
+ b->hash = ceph_decode_8(p);
+ b->weight = ceph_decode_32(p);
+ b->size = ceph_decode_32(p);
+
+ dout("crush_decode bucket size %d off %x %p to %p\n",
+ b->size, (int)(*p-start), *p, end);
+
+ b->items = kcalloc(b->size, sizeof(__s32), GFP_NOFS);
+ if (b->items == NULL)
+ goto badmem;
+
+ ceph_decode_need(p, end, b->size*sizeof(u32), bad);
+ for (j = 0; j < b->size; j++)
+ b->items[j] = ceph_decode_32(p);
+
+ switch (b->alg) {
+ case CRUSH_BUCKET_UNIFORM:
+ err = crush_decode_uniform_bucket(p, end,
+ (struct crush_bucket_uniform *)b);
+ if (err < 0)
+ goto fail;
+ break;
+ case CRUSH_BUCKET_LIST:
+ err = crush_decode_list_bucket(p, end,
+ (struct crush_bucket_list *)b);
+ if (err < 0)
+ goto fail;
+ break;
+ case CRUSH_BUCKET_TREE:
+ err = crush_decode_tree_bucket(p, end,
+ (struct crush_bucket_tree *)b);
+ if (err < 0)
+ goto fail;
+ break;
+ case CRUSH_BUCKET_STRAW:
+ err = crush_decode_straw_bucket(p, end,
+ (struct crush_bucket_straw *)b);
+ if (err < 0)
+ goto fail;
+ break;
+ case CRUSH_BUCKET_STRAW2:
+ err = crush_decode_straw2_bucket(p, end,
+ (struct crush_bucket_straw2 *)b);
+ if (err < 0)
+ goto fail;
+ break;
+ }
+ }
+
+ /* rules */
+ dout("rule vec is %p\n", c->rules);
+ for (i = 0; i < c->max_rules; i++) {
+ u32 yes;
+ struct crush_rule *r;
+
+ ceph_decode_32_safe(p, end, yes, bad);
+ if (!yes) {
+ dout("crush_decode NO rule %d off %x %p to %p\n",
+ i, (int)(*p-start), *p, end);
+ c->rules[i] = NULL;
+ continue;
+ }
+
+ dout("crush_decode rule %d off %x %p to %p\n",
+ i, (int)(*p-start), *p, end);
+
+ /* len */
+ ceph_decode_32_safe(p, end, yes, bad);
+#if BITS_PER_LONG == 32
+ if (yes > (ULONG_MAX - sizeof(*r))
+ / sizeof(struct crush_rule_step))
+ goto bad;
+#endif
+ r = kmalloc(struct_size(r, steps, yes), GFP_NOFS);
+ if (r == NULL)
+ goto badmem;
+ dout(" rule %d is at %p\n", i, r);
+ c->rules[i] = r;
+ r->len = yes;
+ ceph_decode_copy_safe(p, end, &r->mask, 4, bad); /* 4 u8's */
+ ceph_decode_need(p, end, r->len*3*sizeof(u32), bad);
+ for (j = 0; j < r->len; j++) {
+ r->steps[j].op = ceph_decode_32(p);
+ r->steps[j].arg1 = ceph_decode_32(p);
+ r->steps[j].arg2 = ceph_decode_32(p);
+ }
+ }
+
+ err = decode_crush_names(p, end, &c->type_names);
+ if (err)
+ goto fail;
+
+ err = decode_crush_names(p, end, &c->names);
+ if (err)
+ goto fail;
+
+ ceph_decode_skip_map(p, end, 32, string, bad); /* rule_name_map */
+
+ /* tunables */
+ ceph_decode_need(p, end, 3*sizeof(u32), done);
+ c->choose_local_tries = ceph_decode_32(p);
+ c->choose_local_fallback_tries = ceph_decode_32(p);
+ c->choose_total_tries = ceph_decode_32(p);
+ dout("crush decode tunable choose_local_tries = %d\n",
+ c->choose_local_tries);
+ dout("crush decode tunable choose_local_fallback_tries = %d\n",
+ c->choose_local_fallback_tries);
+ dout("crush decode tunable choose_total_tries = %d\n",
+ c->choose_total_tries);
+
+ ceph_decode_need(p, end, sizeof(u32), done);
+ c->chooseleaf_descend_once = ceph_decode_32(p);
+ dout("crush decode tunable chooseleaf_descend_once = %d\n",
+ c->chooseleaf_descend_once);
+
+ ceph_decode_need(p, end, sizeof(u8), done);
+ c->chooseleaf_vary_r = ceph_decode_8(p);
+ dout("crush decode tunable chooseleaf_vary_r = %d\n",
+ c->chooseleaf_vary_r);
+
+ /* skip straw_calc_version, allowed_bucket_algs */
+ ceph_decode_need(p, end, sizeof(u8) + sizeof(u32), done);
+ *p += sizeof(u8) + sizeof(u32);
+
+ ceph_decode_need(p, end, sizeof(u8), done);
+ c->chooseleaf_stable = ceph_decode_8(p);
+ dout("crush decode tunable chooseleaf_stable = %d\n",
+ c->chooseleaf_stable);
+
+ if (*p != end) {
+ /* class_map */
+ ceph_decode_skip_map(p, end, 32, 32, bad);
+ /* class_name */
+ ceph_decode_skip_map(p, end, 32, string, bad);
+ /* class_bucket */
+ ceph_decode_skip_map_of_map(p, end, 32, 32, 32, bad);
+ }
+
+ if (*p != end) {
+ err = decode_choose_args(p, end, c);
+ if (err)
+ goto fail;
+ }
+
+done:
+ crush_finalize(c);
+ dout("crush_decode success\n");
+ return c;
+
+badmem:
+ err = -ENOMEM;
+fail:
+ dout("crush_decode fail %d\n", err);
+ crush_destroy(c);
+ return ERR_PTR(err);
+
+bad:
+ err = -EINVAL;
+ goto fail;
+}
+
+int ceph_pg_compare(const struct ceph_pg *lhs, const struct ceph_pg *rhs)
+{
+ if (lhs->pool < rhs->pool)
+ return -1;
+ if (lhs->pool > rhs->pool)
+ return 1;
+ if (lhs->seed < rhs->seed)
+ return -1;
+ if (lhs->seed > rhs->seed)
+ return 1;
+
+ return 0;
+}
+
+int ceph_spg_compare(const struct ceph_spg *lhs, const struct ceph_spg *rhs)
+{
+ int ret;
+
+ ret = ceph_pg_compare(&lhs->pgid, &rhs->pgid);
+ if (ret)
+ return ret;
+
+ if (lhs->shard < rhs->shard)
+ return -1;
+ if (lhs->shard > rhs->shard)
+ return 1;
+
+ return 0;
+}
+
+static struct ceph_pg_mapping *alloc_pg_mapping(size_t payload_len)
+{
+ struct ceph_pg_mapping *pg;
+
+ pg = kmalloc(sizeof(*pg) + payload_len, GFP_NOIO);
+ if (!pg)
+ return NULL;
+
+ RB_CLEAR_NODE(&pg->node);
+ return pg;
+}
+
+static void free_pg_mapping(struct ceph_pg_mapping *pg)
+{
+ WARN_ON(!RB_EMPTY_NODE(&pg->node));
+
+ kfree(pg);
+}
+
+/*
+ * rbtree of pg_mapping for handling pg_temp (explicit mapping of pgid
+ * to a set of osds) and primary_temp (explicit primary setting)
+ */
+DEFINE_RB_FUNCS2(pg_mapping, struct ceph_pg_mapping, pgid, ceph_pg_compare,
+ RB_BYPTR, const struct ceph_pg *, node)
+
+/*
+ * rbtree of pg pool info
+ */
+DEFINE_RB_FUNCS(pg_pool, struct ceph_pg_pool_info, id, node)
+
+struct ceph_pg_pool_info *ceph_pg_pool_by_id(struct ceph_osdmap *map, u64 id)
+{
+ return lookup_pg_pool(&map->pg_pools, id);
+}
+
+const char *ceph_pg_pool_name_by_id(struct ceph_osdmap *map, u64 id)
+{
+ struct ceph_pg_pool_info *pi;
+
+ if (id == CEPH_NOPOOL)
+ return NULL;
+
+ if (WARN_ON_ONCE(id > (u64) INT_MAX))
+ return NULL;
+
+ pi = lookup_pg_pool(&map->pg_pools, id);
+ return pi ? pi->name : NULL;
+}
+EXPORT_SYMBOL(ceph_pg_pool_name_by_id);
+
+int ceph_pg_poolid_by_name(struct ceph_osdmap *map, const char *name)
+{
+ struct rb_node *rbp;
+
+ for (rbp = rb_first(&map->pg_pools); rbp; rbp = rb_next(rbp)) {
+ struct ceph_pg_pool_info *pi =
+ rb_entry(rbp, struct ceph_pg_pool_info, node);
+ if (pi->name && strcmp(pi->name, name) == 0)
+ return pi->id;
+ }
+ return -ENOENT;
+}
+EXPORT_SYMBOL(ceph_pg_poolid_by_name);
+
+u64 ceph_pg_pool_flags(struct ceph_osdmap *map, u64 id)
+{
+ struct ceph_pg_pool_info *pi;
+
+ pi = lookup_pg_pool(&map->pg_pools, id);
+ return pi ? pi->flags : 0;
+}
+EXPORT_SYMBOL(ceph_pg_pool_flags);
+
+static void __remove_pg_pool(struct rb_root *root, struct ceph_pg_pool_info *pi)
+{
+ erase_pg_pool(root, pi);
+ kfree(pi->name);
+ kfree(pi);
+}
+
+static int decode_pool(void **p, void *end, struct ceph_pg_pool_info *pi)
+{
+ u8 ev, cv;
+ unsigned len, num;
+ void *pool_end;
+
+ ceph_decode_need(p, end, 2 + 4, bad);
+ ev = ceph_decode_8(p); /* encoding version */
+ cv = ceph_decode_8(p); /* compat version */
+ if (ev < 5) {
+ pr_warn("got v %d < 5 cv %d of ceph_pg_pool\n", ev, cv);
+ return -EINVAL;
+ }
+ if (cv > 9) {
+ pr_warn("got v %d cv %d > 9 of ceph_pg_pool\n", ev, cv);
+ return -EINVAL;
+ }
+ len = ceph_decode_32(p);
+ ceph_decode_need(p, end, len, bad);
+ pool_end = *p + len;
+
+ pi->type = ceph_decode_8(p);
+ pi->size = ceph_decode_8(p);
+ pi->crush_ruleset = ceph_decode_8(p);
+ pi->object_hash = ceph_decode_8(p);
+
+ pi->pg_num = ceph_decode_32(p);
+ pi->pgp_num = ceph_decode_32(p);
+
+ *p += 4 + 4; /* skip lpg* */
+ *p += 4; /* skip last_change */
+ *p += 8 + 4; /* skip snap_seq, snap_epoch */
+
+ /* skip snaps */
+ num = ceph_decode_32(p);
+ while (num--) {
+ *p += 8; /* snapid key */
+ *p += 1 + 1; /* versions */
+ len = ceph_decode_32(p);
+ *p += len;
+ }
+
+ /* skip removed_snaps */
+ num = ceph_decode_32(p);
+ *p += num * (8 + 8);
+
+ *p += 8; /* skip auid */
+ pi->flags = ceph_decode_64(p);
+ *p += 4; /* skip crash_replay_interval */
+
+ if (ev >= 7)
+ pi->min_size = ceph_decode_8(p);
+ else
+ pi->min_size = pi->size - pi->size / 2;
+
+ if (ev >= 8)
+ *p += 8 + 8; /* skip quota_max_* */
+
+ if (ev >= 9) {
+ /* skip tiers */
+ num = ceph_decode_32(p);
+ *p += num * 8;
+
+ *p += 8; /* skip tier_of */
+ *p += 1; /* skip cache_mode */
+
+ pi->read_tier = ceph_decode_64(p);
+ pi->write_tier = ceph_decode_64(p);
+ } else {
+ pi->read_tier = -1;
+ pi->write_tier = -1;
+ }
+
+ if (ev >= 10) {
+ /* skip properties */
+ num = ceph_decode_32(p);
+ while (num--) {
+ len = ceph_decode_32(p);
+ *p += len; /* key */
+ len = ceph_decode_32(p);
+ *p += len; /* val */
+ }
+ }
+
+ if (ev >= 11) {
+ /* skip hit_set_params */
+ *p += 1 + 1; /* versions */
+ len = ceph_decode_32(p);
+ *p += len;
+
+ *p += 4; /* skip hit_set_period */
+ *p += 4; /* skip hit_set_count */
+ }
+
+ if (ev >= 12)
+ *p += 4; /* skip stripe_width */
+
+ if (ev >= 13) {
+ *p += 8; /* skip target_max_bytes */
+ *p += 8; /* skip target_max_objects */
+ *p += 4; /* skip cache_target_dirty_ratio_micro */
+ *p += 4; /* skip cache_target_full_ratio_micro */
+ *p += 4; /* skip cache_min_flush_age */
+ *p += 4; /* skip cache_min_evict_age */
+ }
+
+ if (ev >= 14) {
+ /* skip erasure_code_profile */
+ len = ceph_decode_32(p);
+ *p += len;
+ }
+
+ /*
+ * last_force_op_resend_preluminous, will be overridden if the
+ * map was encoded with RESEND_ON_SPLIT
+ */
+ if (ev >= 15)
+ pi->last_force_request_resend = ceph_decode_32(p);
+ else
+ pi->last_force_request_resend = 0;
+
+ if (ev >= 16)
+ *p += 4; /* skip min_read_recency_for_promote */
+
+ if (ev >= 17)
+ *p += 8; /* skip expected_num_objects */
+
+ if (ev >= 19)
+ *p += 4; /* skip cache_target_dirty_high_ratio_micro */
+
+ if (ev >= 20)
+ *p += 4; /* skip min_write_recency_for_promote */
+
+ if (ev >= 21)
+ *p += 1; /* skip use_gmt_hitset */
+
+ if (ev >= 22)
+ *p += 1; /* skip fast_read */
+
+ if (ev >= 23) {
+ *p += 4; /* skip hit_set_grade_decay_rate */
+ *p += 4; /* skip hit_set_search_last_n */
+ }
+
+ if (ev >= 24) {
+ /* skip opts */
+ *p += 1 + 1; /* versions */
+ len = ceph_decode_32(p);
+ *p += len;
+ }
+
+ if (ev >= 25)
+ pi->last_force_request_resend = ceph_decode_32(p);
+
+ /* ignore the rest */
+
+ *p = pool_end;
+ calc_pg_masks(pi);
+ return 0;
+
+bad:
+ return -EINVAL;
+}
+
+static int decode_pool_names(void **p, void *end, struct ceph_osdmap *map)
+{
+ struct ceph_pg_pool_info *pi;
+ u32 num, len;
+ u64 pool;
+
+ ceph_decode_32_safe(p, end, num, bad);
+ dout(" %d pool names\n", num);
+ while (num--) {
+ ceph_decode_64_safe(p, end, pool, bad);
+ ceph_decode_32_safe(p, end, len, bad);
+ dout(" pool %llu len %d\n", pool, len);
+ ceph_decode_need(p, end, len, bad);
+ pi = lookup_pg_pool(&map->pg_pools, pool);
+ if (pi) {
+ char *name = kstrndup(*p, len, GFP_NOFS);
+
+ if (!name)
+ return -ENOMEM;
+ kfree(pi->name);
+ pi->name = name;
+ dout(" name is %s\n", pi->name);
+ }
+ *p += len;
+ }
+ return 0;
+
+bad:
+ return -EINVAL;
+}
+
+/*
+ * CRUSH workspaces
+ *
+ * workspace_manager framework borrowed from fs/btrfs/compression.c.
+ * Two simplifications: there is only one type of workspace and there
+ * is always at least one workspace.
+ */
+static struct crush_work *alloc_workspace(const struct crush_map *c)
+{
+ struct crush_work *work;
+ size_t work_size;
+
+ WARN_ON(!c->working_size);
+ work_size = crush_work_size(c, CEPH_PG_MAX_SIZE);
+ dout("%s work_size %zu bytes\n", __func__, work_size);
+
+ work = kvmalloc(work_size, GFP_NOIO);
+ if (!work)
+ return NULL;
+
+ INIT_LIST_HEAD(&work->item);
+ crush_init_workspace(c, work);
+ return work;
+}
+
+static void free_workspace(struct crush_work *work)
+{
+ WARN_ON(!list_empty(&work->item));
+ kvfree(work);
+}
+
+static void init_workspace_manager(struct workspace_manager *wsm)
+{
+ INIT_LIST_HEAD(&wsm->idle_ws);
+ spin_lock_init(&wsm->ws_lock);
+ atomic_set(&wsm->total_ws, 0);
+ wsm->free_ws = 0;
+ init_waitqueue_head(&wsm->ws_wait);
+}
+
+static void add_initial_workspace(struct workspace_manager *wsm,
+ struct crush_work *work)
+{
+ WARN_ON(!list_empty(&wsm->idle_ws));
+
+ list_add(&work->item, &wsm->idle_ws);
+ atomic_set(&wsm->total_ws, 1);
+ wsm->free_ws = 1;
+}
+
+static void cleanup_workspace_manager(struct workspace_manager *wsm)
+{
+ struct crush_work *work;
+
+ while (!list_empty(&wsm->idle_ws)) {
+ work = list_first_entry(&wsm->idle_ws, struct crush_work,
+ item);
+ list_del_init(&work->item);
+ free_workspace(work);
+ }
+ atomic_set(&wsm->total_ws, 0);
+ wsm->free_ws = 0;
+}
+
+/*
+ * Finds an available workspace or allocates a new one. If it's not
+ * possible to allocate a new one, waits until there is one.
+ */
+static struct crush_work *get_workspace(struct workspace_manager *wsm,
+ const struct crush_map *c)
+{
+ struct crush_work *work;
+ int cpus = num_online_cpus();
+
+again:
+ spin_lock(&wsm->ws_lock);
+ if (!list_empty(&wsm->idle_ws)) {
+ work = list_first_entry(&wsm->idle_ws, struct crush_work,
+ item);
+ list_del_init(&work->item);
+ wsm->free_ws--;
+ spin_unlock(&wsm->ws_lock);
+ return work;
+
+ }
+ if (atomic_read(&wsm->total_ws) > cpus) {
+ DEFINE_WAIT(wait);
+
+ spin_unlock(&wsm->ws_lock);
+ prepare_to_wait(&wsm->ws_wait, &wait, TASK_UNINTERRUPTIBLE);
+ if (atomic_read(&wsm->total_ws) > cpus && !wsm->free_ws)
+ schedule();
+ finish_wait(&wsm->ws_wait, &wait);
+ goto again;
+ }
+ atomic_inc(&wsm->total_ws);
+ spin_unlock(&wsm->ws_lock);
+
+ work = alloc_workspace(c);
+ if (!work) {
+ atomic_dec(&wsm->total_ws);
+ wake_up(&wsm->ws_wait);
+
+ /*
+ * Do not return the error but go back to waiting. We
+ * have the initial workspace and the CRUSH computation
+ * time is bounded so we will get it eventually.
+ */
+ WARN_ON(atomic_read(&wsm->total_ws) < 1);
+ goto again;
+ }
+ return work;
+}
+
+/*
+ * Puts a workspace back on the list or frees it if we have enough
+ * idle ones sitting around.
+ */
+static void put_workspace(struct workspace_manager *wsm,
+ struct crush_work *work)
+{
+ spin_lock(&wsm->ws_lock);
+ if (wsm->free_ws <= num_online_cpus()) {
+ list_add(&work->item, &wsm->idle_ws);
+ wsm->free_ws++;
+ spin_unlock(&wsm->ws_lock);
+ goto wake;
+ }
+ spin_unlock(&wsm->ws_lock);
+
+ free_workspace(work);
+ atomic_dec(&wsm->total_ws);
+wake:
+ if (wq_has_sleeper(&wsm->ws_wait))
+ wake_up(&wsm->ws_wait);
+}
+
+/*
+ * osd map
+ */
+struct ceph_osdmap *ceph_osdmap_alloc(void)
+{
+ struct ceph_osdmap *map;
+
+ map = kzalloc(sizeof(*map), GFP_NOIO);
+ if (!map)
+ return NULL;
+
+ map->pg_pools = RB_ROOT;
+ map->pool_max = -1;
+ map->pg_temp = RB_ROOT;
+ map->primary_temp = RB_ROOT;
+ map->pg_upmap = RB_ROOT;
+ map->pg_upmap_items = RB_ROOT;
+
+ init_workspace_manager(&map->crush_wsm);
+
+ return map;
+}
+
+void ceph_osdmap_destroy(struct ceph_osdmap *map)
+{
+ dout("osdmap_destroy %p\n", map);
+
+ if (map->crush)
+ crush_destroy(map->crush);
+ cleanup_workspace_manager(&map->crush_wsm);
+
+ while (!RB_EMPTY_ROOT(&map->pg_temp)) {
+ struct ceph_pg_mapping *pg =
+ rb_entry(rb_first(&map->pg_temp),
+ struct ceph_pg_mapping, node);
+ erase_pg_mapping(&map->pg_temp, pg);
+ free_pg_mapping(pg);
+ }
+ while (!RB_EMPTY_ROOT(&map->primary_temp)) {
+ struct ceph_pg_mapping *pg =
+ rb_entry(rb_first(&map->primary_temp),
+ struct ceph_pg_mapping, node);
+ erase_pg_mapping(&map->primary_temp, pg);
+ free_pg_mapping(pg);
+ }
+ while (!RB_EMPTY_ROOT(&map->pg_upmap)) {
+ struct ceph_pg_mapping *pg =
+ rb_entry(rb_first(&map->pg_upmap),
+ struct ceph_pg_mapping, node);
+ rb_erase(&pg->node, &map->pg_upmap);
+ kfree(pg);
+ }
+ while (!RB_EMPTY_ROOT(&map->pg_upmap_items)) {
+ struct ceph_pg_mapping *pg =
+ rb_entry(rb_first(&map->pg_upmap_items),
+ struct ceph_pg_mapping, node);
+ rb_erase(&pg->node, &map->pg_upmap_items);
+ kfree(pg);
+ }
+ while (!RB_EMPTY_ROOT(&map->pg_pools)) {
+ struct ceph_pg_pool_info *pi =
+ rb_entry(rb_first(&map->pg_pools),
+ struct ceph_pg_pool_info, node);
+ __remove_pg_pool(&map->pg_pools, pi);
+ }
+ kvfree(map->osd_state);
+ kvfree(map->osd_weight);
+ kvfree(map->osd_addr);
+ kvfree(map->osd_primary_affinity);
+ kfree(map);
+}
+
+/*
+ * Adjust max_osd value, (re)allocate arrays.
+ *
+ * The new elements are properly initialized.
+ */
+static int osdmap_set_max_osd(struct ceph_osdmap *map, u32 max)
+{
+ u32 *state;
+ u32 *weight;
+ struct ceph_entity_addr *addr;
+ u32 to_copy;
+ int i;
+
+ dout("%s old %u new %u\n", __func__, map->max_osd, max);
+ if (max == map->max_osd)
+ return 0;
+
+ state = kvmalloc(array_size(max, sizeof(*state)), GFP_NOFS);
+ weight = kvmalloc(array_size(max, sizeof(*weight)), GFP_NOFS);
+ addr = kvmalloc(array_size(max, sizeof(*addr)), GFP_NOFS);
+ if (!state || !weight || !addr) {
+ kvfree(state);
+ kvfree(weight);
+ kvfree(addr);
+ return -ENOMEM;
+ }
+
+ to_copy = min(map->max_osd, max);
+ if (map->osd_state) {
+ memcpy(state, map->osd_state, to_copy * sizeof(*state));
+ memcpy(weight, map->osd_weight, to_copy * sizeof(*weight));
+ memcpy(addr, map->osd_addr, to_copy * sizeof(*addr));
+ kvfree(map->osd_state);
+ kvfree(map->osd_weight);
+ kvfree(map->osd_addr);
+ }
+
+ map->osd_state = state;
+ map->osd_weight = weight;
+ map->osd_addr = addr;
+ for (i = map->max_osd; i < max; i++) {
+ map->osd_state[i] = 0;
+ map->osd_weight[i] = CEPH_OSD_OUT;
+ memset(map->osd_addr + i, 0, sizeof(*map->osd_addr));
+ }
+
+ if (map->osd_primary_affinity) {
+ u32 *affinity;
+
+ affinity = kvmalloc(array_size(max, sizeof(*affinity)),
+ GFP_NOFS);
+ if (!affinity)
+ return -ENOMEM;
+
+ memcpy(affinity, map->osd_primary_affinity,
+ to_copy * sizeof(*affinity));
+ kvfree(map->osd_primary_affinity);
+
+ map->osd_primary_affinity = affinity;
+ for (i = map->max_osd; i < max; i++)
+ map->osd_primary_affinity[i] =
+ CEPH_OSD_DEFAULT_PRIMARY_AFFINITY;
+ }
+
+ map->max_osd = max;
+
+ return 0;
+}
+
+static int osdmap_set_crush(struct ceph_osdmap *map, struct crush_map *crush)
+{
+ struct crush_work *work;
+
+ if (IS_ERR(crush))
+ return PTR_ERR(crush);
+
+ work = alloc_workspace(crush);
+ if (!work) {
+ crush_destroy(crush);
+ return -ENOMEM;
+ }
+
+ if (map->crush)
+ crush_destroy(map->crush);
+ cleanup_workspace_manager(&map->crush_wsm);
+ map->crush = crush;
+ add_initial_workspace(&map->crush_wsm, work);
+ return 0;
+}
+
+#define OSDMAP_WRAPPER_COMPAT_VER 7
+#define OSDMAP_CLIENT_DATA_COMPAT_VER 1
+
+/*
+ * Return 0 or error. On success, *v is set to 0 for old (v6) osdmaps,
+ * to struct_v of the client_data section for new (v7 and above)
+ * osdmaps.
+ */
+static int get_osdmap_client_data_v(void **p, void *end,
+ const char *prefix, u8 *v)
+{
+ u8 struct_v;
+
+ ceph_decode_8_safe(p, end, struct_v, e_inval);
+ if (struct_v >= 7) {
+ u8 struct_compat;
+
+ ceph_decode_8_safe(p, end, struct_compat, e_inval);
+ if (struct_compat > OSDMAP_WRAPPER_COMPAT_VER) {
+ pr_warn("got v %d cv %d > %d of %s ceph_osdmap\n",
+ struct_v, struct_compat,
+ OSDMAP_WRAPPER_COMPAT_VER, prefix);
+ return -EINVAL;
+ }
+ *p += 4; /* ignore wrapper struct_len */
+
+ ceph_decode_8_safe(p, end, struct_v, e_inval);
+ ceph_decode_8_safe(p, end, struct_compat, e_inval);
+ if (struct_compat > OSDMAP_CLIENT_DATA_COMPAT_VER) {
+ pr_warn("got v %d cv %d > %d of %s ceph_osdmap client data\n",
+ struct_v, struct_compat,
+ OSDMAP_CLIENT_DATA_COMPAT_VER, prefix);
+ return -EINVAL;
+ }
+ *p += 4; /* ignore client data struct_len */
+ } else {
+ u16 version;
+
+ *p -= 1;
+ ceph_decode_16_safe(p, end, version, e_inval);
+ if (version < 6) {
+ pr_warn("got v %d < 6 of %s ceph_osdmap\n",
+ version, prefix);
+ return -EINVAL;
+ }
+
+ /* old osdmap encoding */
+ struct_v = 0;
+ }
+
+ *v = struct_v;
+ return 0;
+
+e_inval:
+ return -EINVAL;
+}
+
+static int __decode_pools(void **p, void *end, struct ceph_osdmap *map,
+ bool incremental)
+{
+ u32 n;
+
+ ceph_decode_32_safe(p, end, n, e_inval);
+ while (n--) {
+ struct ceph_pg_pool_info *pi;
+ u64 pool;
+ int ret;
+
+ ceph_decode_64_safe(p, end, pool, e_inval);
+
+ pi = lookup_pg_pool(&map->pg_pools, pool);
+ if (!incremental || !pi) {
+ pi = kzalloc(sizeof(*pi), GFP_NOFS);
+ if (!pi)
+ return -ENOMEM;
+
+ RB_CLEAR_NODE(&pi->node);
+ pi->id = pool;
+
+ if (!__insert_pg_pool(&map->pg_pools, pi)) {
+ kfree(pi);
+ return -EEXIST;
+ }
+ }
+
+ ret = decode_pool(p, end, pi);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+
+e_inval:
+ return -EINVAL;
+}
+
+static int decode_pools(void **p, void *end, struct ceph_osdmap *map)
+{
+ return __decode_pools(p, end, map, false);
+}
+
+static int decode_new_pools(void **p, void *end, struct ceph_osdmap *map)
+{
+ return __decode_pools(p, end, map, true);
+}
+
+typedef struct ceph_pg_mapping *(*decode_mapping_fn_t)(void **, void *, bool);
+
+static int decode_pg_mapping(void **p, void *end, struct rb_root *mapping_root,
+ decode_mapping_fn_t fn, bool incremental)
+{
+ u32 n;
+
+ WARN_ON(!incremental && !fn);
+
+ ceph_decode_32_safe(p, end, n, e_inval);
+ while (n--) {
+ struct ceph_pg_mapping *pg;
+ struct ceph_pg pgid;
+ int ret;
+
+ ret = ceph_decode_pgid(p, end, &pgid);
+ if (ret)
+ return ret;
+
+ pg = lookup_pg_mapping(mapping_root, &pgid);
+ if (pg) {
+ WARN_ON(!incremental);
+ erase_pg_mapping(mapping_root, pg);
+ free_pg_mapping(pg);
+ }
+
+ if (fn) {
+ pg = fn(p, end, incremental);
+ if (IS_ERR(pg))
+ return PTR_ERR(pg);
+
+ if (pg) {
+ pg->pgid = pgid; /* struct */
+ insert_pg_mapping(mapping_root, pg);
+ }
+ }
+ }
+
+ return 0;
+
+e_inval:
+ return -EINVAL;
+}
+
+static struct ceph_pg_mapping *__decode_pg_temp(void **p, void *end,
+ bool incremental)
+{
+ struct ceph_pg_mapping *pg;
+ u32 len, i;
+
+ ceph_decode_32_safe(p, end, len, e_inval);
+ if (len == 0 && incremental)
+ return NULL; /* new_pg_temp: [] to remove */
+ if (len > (SIZE_MAX - sizeof(*pg)) / sizeof(u32))
+ return ERR_PTR(-EINVAL);
+
+ ceph_decode_need(p, end, len * sizeof(u32), e_inval);
+ pg = alloc_pg_mapping(len * sizeof(u32));
+ if (!pg)
+ return ERR_PTR(-ENOMEM);
+
+ pg->pg_temp.len = len;
+ for (i = 0; i < len; i++)
+ pg->pg_temp.osds[i] = ceph_decode_32(p);
+
+ return pg;
+
+e_inval:
+ return ERR_PTR(-EINVAL);
+}
+
+static int decode_pg_temp(void **p, void *end, struct ceph_osdmap *map)
+{
+ return decode_pg_mapping(p, end, &map->pg_temp, __decode_pg_temp,
+ false);
+}
+
+static int decode_new_pg_temp(void **p, void *end, struct ceph_osdmap *map)
+{
+ return decode_pg_mapping(p, end, &map->pg_temp, __decode_pg_temp,
+ true);
+}
+
+static struct ceph_pg_mapping *__decode_primary_temp(void **p, void *end,
+ bool incremental)
+{
+ struct ceph_pg_mapping *pg;
+ u32 osd;
+
+ ceph_decode_32_safe(p, end, osd, e_inval);
+ if (osd == (u32)-1 && incremental)
+ return NULL; /* new_primary_temp: -1 to remove */
+
+ pg = alloc_pg_mapping(0);
+ if (!pg)
+ return ERR_PTR(-ENOMEM);
+
+ pg->primary_temp.osd = osd;
+ return pg;
+
+e_inval:
+ return ERR_PTR(-EINVAL);
+}
+
+static int decode_primary_temp(void **p, void *end, struct ceph_osdmap *map)
+{
+ return decode_pg_mapping(p, end, &map->primary_temp,
+ __decode_primary_temp, false);
+}
+
+static int decode_new_primary_temp(void **p, void *end,
+ struct ceph_osdmap *map)
+{
+ return decode_pg_mapping(p, end, &map->primary_temp,
+ __decode_primary_temp, true);
+}
+
+u32 ceph_get_primary_affinity(struct ceph_osdmap *map, int osd)
+{
+ BUG_ON(osd >= map->max_osd);
+
+ if (!map->osd_primary_affinity)
+ return CEPH_OSD_DEFAULT_PRIMARY_AFFINITY;
+
+ return map->osd_primary_affinity[osd];
+}
+
+static int set_primary_affinity(struct ceph_osdmap *map, int osd, u32 aff)
+{
+ BUG_ON(osd >= map->max_osd);
+
+ if (!map->osd_primary_affinity) {
+ int i;
+
+ map->osd_primary_affinity = kvmalloc(
+ array_size(map->max_osd, sizeof(*map->osd_primary_affinity)),
+ GFP_NOFS);
+ if (!map->osd_primary_affinity)
+ return -ENOMEM;
+
+ for (i = 0; i < map->max_osd; i++)
+ map->osd_primary_affinity[i] =
+ CEPH_OSD_DEFAULT_PRIMARY_AFFINITY;
+ }
+
+ map->osd_primary_affinity[osd] = aff;
+
+ return 0;
+}
+
+static int decode_primary_affinity(void **p, void *end,
+ struct ceph_osdmap *map)
+{
+ u32 len, i;
+
+ ceph_decode_32_safe(p, end, len, e_inval);
+ if (len == 0) {
+ kvfree(map->osd_primary_affinity);
+ map->osd_primary_affinity = NULL;
+ return 0;
+ }
+ if (len != map->max_osd)
+ goto e_inval;
+
+ ceph_decode_need(p, end, map->max_osd*sizeof(u32), e_inval);
+
+ for (i = 0; i < map->max_osd; i++) {
+ int ret;
+
+ ret = set_primary_affinity(map, i, ceph_decode_32(p));
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+
+e_inval:
+ return -EINVAL;
+}
+
+static int decode_new_primary_affinity(void **p, void *end,
+ struct ceph_osdmap *map)
+{
+ u32 n;
+
+ ceph_decode_32_safe(p, end, n, e_inval);
+ while (n--) {
+ u32 osd, aff;
+ int ret;
+
+ ceph_decode_32_safe(p, end, osd, e_inval);
+ ceph_decode_32_safe(p, end, aff, e_inval);
+
+ ret = set_primary_affinity(map, osd, aff);
+ if (ret)
+ return ret;
+
+ osdmap_info(map, "osd%d primary-affinity 0x%x\n", osd, aff);
+ }
+
+ return 0;
+
+e_inval:
+ return -EINVAL;
+}
+
+static struct ceph_pg_mapping *__decode_pg_upmap(void **p, void *end,
+ bool __unused)
+{
+ return __decode_pg_temp(p, end, false);
+}
+
+static int decode_pg_upmap(void **p, void *end, struct ceph_osdmap *map)
+{
+ return decode_pg_mapping(p, end, &map->pg_upmap, __decode_pg_upmap,
+ false);
+}
+
+static int decode_new_pg_upmap(void **p, void *end, struct ceph_osdmap *map)
+{
+ return decode_pg_mapping(p, end, &map->pg_upmap, __decode_pg_upmap,
+ true);
+}
+
+static int decode_old_pg_upmap(void **p, void *end, struct ceph_osdmap *map)
+{
+ return decode_pg_mapping(p, end, &map->pg_upmap, NULL, true);
+}
+
+static struct ceph_pg_mapping *__decode_pg_upmap_items(void **p, void *end,
+ bool __unused)
+{
+ struct ceph_pg_mapping *pg;
+ u32 len, i;
+
+ ceph_decode_32_safe(p, end, len, e_inval);
+ if (len > (SIZE_MAX - sizeof(*pg)) / (2 * sizeof(u32)))
+ return ERR_PTR(-EINVAL);
+
+ ceph_decode_need(p, end, 2 * len * sizeof(u32), e_inval);
+ pg = alloc_pg_mapping(2 * len * sizeof(u32));
+ if (!pg)
+ return ERR_PTR(-ENOMEM);
+
+ pg->pg_upmap_items.len = len;
+ for (i = 0; i < len; i++) {
+ pg->pg_upmap_items.from_to[i][0] = ceph_decode_32(p);
+ pg->pg_upmap_items.from_to[i][1] = ceph_decode_32(p);
+ }
+
+ return pg;
+
+e_inval:
+ return ERR_PTR(-EINVAL);
+}
+
+static int decode_pg_upmap_items(void **p, void *end, struct ceph_osdmap *map)
+{
+ return decode_pg_mapping(p, end, &map->pg_upmap_items,
+ __decode_pg_upmap_items, false);
+}
+
+static int decode_new_pg_upmap_items(void **p, void *end,
+ struct ceph_osdmap *map)
+{
+ return decode_pg_mapping(p, end, &map->pg_upmap_items,
+ __decode_pg_upmap_items, true);
+}
+
+static int decode_old_pg_upmap_items(void **p, void *end,
+ struct ceph_osdmap *map)
+{
+ return decode_pg_mapping(p, end, &map->pg_upmap_items, NULL, true);
+}
+
+/*
+ * decode a full map.
+ */
+static int osdmap_decode(void **p, void *end, bool msgr2,
+ struct ceph_osdmap *map)
+{
+ u8 struct_v;
+ u32 epoch = 0;
+ void *start = *p;
+ u32 max;
+ u32 len, i;
+ int err;
+
+ dout("%s %p to %p len %d\n", __func__, *p, end, (int)(end - *p));
+
+ err = get_osdmap_client_data_v(p, end, "full", &struct_v);
+ if (err)
+ goto bad;
+
+ /* fsid, epoch, created, modified */
+ ceph_decode_need(p, end, sizeof(map->fsid) + sizeof(u32) +
+ sizeof(map->created) + sizeof(map->modified), e_inval);
+ ceph_decode_copy(p, &map->fsid, sizeof(map->fsid));
+ epoch = map->epoch = ceph_decode_32(p);
+ ceph_decode_copy(p, &map->created, sizeof(map->created));
+ ceph_decode_copy(p, &map->modified, sizeof(map->modified));
+
+ /* pools */
+ err = decode_pools(p, end, map);
+ if (err)
+ goto bad;
+
+ /* pool_name */
+ err = decode_pool_names(p, end, map);
+ if (err)
+ goto bad;
+
+ ceph_decode_32_safe(p, end, map->pool_max, e_inval);
+
+ ceph_decode_32_safe(p, end, map->flags, e_inval);
+
+ /* max_osd */
+ ceph_decode_32_safe(p, end, max, e_inval);
+
+ /* (re)alloc osd arrays */
+ err = osdmap_set_max_osd(map, max);
+ if (err)
+ goto bad;
+
+ /* osd_state, osd_weight, osd_addrs->client_addr */
+ ceph_decode_need(p, end, 3*sizeof(u32) +
+ map->max_osd*(struct_v >= 5 ? sizeof(u32) :
+ sizeof(u8)) +
+ sizeof(*map->osd_weight), e_inval);
+ if (ceph_decode_32(p) != map->max_osd)
+ goto e_inval;
+
+ if (struct_v >= 5) {
+ for (i = 0; i < map->max_osd; i++)
+ map->osd_state[i] = ceph_decode_32(p);
+ } else {
+ for (i = 0; i < map->max_osd; i++)
+ map->osd_state[i] = ceph_decode_8(p);
+ }
+
+ if (ceph_decode_32(p) != map->max_osd)
+ goto e_inval;
+
+ for (i = 0; i < map->max_osd; i++)
+ map->osd_weight[i] = ceph_decode_32(p);
+
+ if (ceph_decode_32(p) != map->max_osd)
+ goto e_inval;
+
+ for (i = 0; i < map->max_osd; i++) {
+ struct ceph_entity_addr *addr = &map->osd_addr[i];
+
+ if (struct_v >= 8)
+ err = ceph_decode_entity_addrvec(p, end, msgr2, addr);
+ else
+ err = ceph_decode_entity_addr(p, end, addr);
+ if (err)
+ goto bad;
+
+ dout("%s osd%d addr %s\n", __func__, i, ceph_pr_addr(addr));
+ }
+
+ /* pg_temp */
+ err = decode_pg_temp(p, end, map);
+ if (err)
+ goto bad;
+
+ /* primary_temp */
+ if (struct_v >= 1) {
+ err = decode_primary_temp(p, end, map);
+ if (err)
+ goto bad;
+ }
+
+ /* primary_affinity */
+ if (struct_v >= 2) {
+ err = decode_primary_affinity(p, end, map);
+ if (err)
+ goto bad;
+ } else {
+ WARN_ON(map->osd_primary_affinity);
+ }
+
+ /* crush */
+ ceph_decode_32_safe(p, end, len, e_inval);
+ err = osdmap_set_crush(map, crush_decode(*p, min(*p + len, end)));
+ if (err)
+ goto bad;
+
+ *p += len;
+ if (struct_v >= 3) {
+ /* erasure_code_profiles */
+ ceph_decode_skip_map_of_map(p, end, string, string, string,
+ e_inval);
+ }
+
+ if (struct_v >= 4) {
+ err = decode_pg_upmap(p, end, map);
+ if (err)
+ goto bad;
+
+ err = decode_pg_upmap_items(p, end, map);
+ if (err)
+ goto bad;
+ } else {
+ WARN_ON(!RB_EMPTY_ROOT(&map->pg_upmap));
+ WARN_ON(!RB_EMPTY_ROOT(&map->pg_upmap_items));
+ }
+
+ /* ignore the rest */
+ *p = end;
+
+ dout("full osdmap epoch %d max_osd %d\n", map->epoch, map->max_osd);
+ return 0;
+
+e_inval:
+ err = -EINVAL;
+bad:
+ pr_err("corrupt full osdmap (%d) epoch %d off %d (%p of %p-%p)\n",
+ err, epoch, (int)(*p - start), *p, start, end);
+ print_hex_dump(KERN_DEBUG, "osdmap: ",
+ DUMP_PREFIX_OFFSET, 16, 1,
+ start, end - start, true);
+ return err;
+}
+
+/*
+ * Allocate and decode a full map.
+ */
+struct ceph_osdmap *ceph_osdmap_decode(void **p, void *end, bool msgr2)
+{
+ struct ceph_osdmap *map;
+ int ret;
+
+ map = ceph_osdmap_alloc();
+ if (!map)
+ return ERR_PTR(-ENOMEM);
+
+ ret = osdmap_decode(p, end, msgr2, map);
+ if (ret) {
+ ceph_osdmap_destroy(map);
+ return ERR_PTR(ret);
+ }
+
+ return map;
+}
+
+/*
+ * Encoding order is (new_up_client, new_state, new_weight). Need to
+ * apply in the (new_weight, new_state, new_up_client) order, because
+ * an incremental map may look like e.g.
+ *
+ * new_up_client: { osd=6, addr=... } # set osd_state and addr
+ * new_state: { osd=6, xorstate=EXISTS } # clear osd_state
+ */
+static int decode_new_up_state_weight(void **p, void *end, u8 struct_v,
+ bool msgr2, struct ceph_osdmap *map)
+{
+ void *new_up_client;
+ void *new_state;
+ void *new_weight_end;
+ u32 len;
+ int ret;
+ int i;
+
+ new_up_client = *p;
+ ceph_decode_32_safe(p, end, len, e_inval);
+ for (i = 0; i < len; ++i) {
+ struct ceph_entity_addr addr;
+
+ ceph_decode_skip_32(p, end, e_inval);
+ if (struct_v >= 7)
+ ret = ceph_decode_entity_addrvec(p, end, msgr2, &addr);
+ else
+ ret = ceph_decode_entity_addr(p, end, &addr);
+ if (ret)
+ return ret;
+ }
+
+ new_state = *p;
+ ceph_decode_32_safe(p, end, len, e_inval);
+ len *= sizeof(u32) + (struct_v >= 5 ? sizeof(u32) : sizeof(u8));
+ ceph_decode_need(p, end, len, e_inval);
+ *p += len;
+
+ /* new_weight */
+ ceph_decode_32_safe(p, end, len, e_inval);
+ while (len--) {
+ s32 osd;
+ u32 w;
+
+ ceph_decode_need(p, end, 2*sizeof(u32), e_inval);
+ osd = ceph_decode_32(p);
+ w = ceph_decode_32(p);
+ BUG_ON(osd >= map->max_osd);
+ osdmap_info(map, "osd%d weight 0x%x %s\n", osd, w,
+ w == CEPH_OSD_IN ? "(in)" :
+ (w == CEPH_OSD_OUT ? "(out)" : ""));
+ map->osd_weight[osd] = w;
+
+ /*
+ * If we are marking in, set the EXISTS, and clear the
+ * AUTOOUT and NEW bits.
+ */
+ if (w) {
+ map->osd_state[osd] |= CEPH_OSD_EXISTS;
+ map->osd_state[osd] &= ~(CEPH_OSD_AUTOOUT |
+ CEPH_OSD_NEW);
+ }
+ }
+ new_weight_end = *p;
+
+ /* new_state (up/down) */
+ *p = new_state;
+ len = ceph_decode_32(p);
+ while (len--) {
+ s32 osd;
+ u32 xorstate;
+
+ osd = ceph_decode_32(p);
+ if (struct_v >= 5)
+ xorstate = ceph_decode_32(p);
+ else
+ xorstate = ceph_decode_8(p);
+ if (xorstate == 0)
+ xorstate = CEPH_OSD_UP;
+ BUG_ON(osd >= map->max_osd);
+ if ((map->osd_state[osd] & CEPH_OSD_UP) &&
+ (xorstate & CEPH_OSD_UP))
+ osdmap_info(map, "osd%d down\n", osd);
+ if ((map->osd_state[osd] & CEPH_OSD_EXISTS) &&
+ (xorstate & CEPH_OSD_EXISTS)) {
+ osdmap_info(map, "osd%d does not exist\n", osd);
+ ret = set_primary_affinity(map, osd,
+ CEPH_OSD_DEFAULT_PRIMARY_AFFINITY);
+ if (ret)
+ return ret;
+ memset(map->osd_addr + osd, 0, sizeof(*map->osd_addr));
+ map->osd_state[osd] = 0;
+ } else {
+ map->osd_state[osd] ^= xorstate;
+ }
+ }
+
+ /* new_up_client */
+ *p = new_up_client;
+ len = ceph_decode_32(p);
+ while (len--) {
+ s32 osd;
+ struct ceph_entity_addr addr;
+
+ osd = ceph_decode_32(p);
+ BUG_ON(osd >= map->max_osd);
+ if (struct_v >= 7)
+ ret = ceph_decode_entity_addrvec(p, end, msgr2, &addr);
+ else
+ ret = ceph_decode_entity_addr(p, end, &addr);
+ if (ret)
+ return ret;
+
+ dout("%s osd%d addr %s\n", __func__, osd, ceph_pr_addr(&addr));
+
+ osdmap_info(map, "osd%d up\n", osd);
+ map->osd_state[osd] |= CEPH_OSD_EXISTS | CEPH_OSD_UP;
+ map->osd_addr[osd] = addr;
+ }
+
+ *p = new_weight_end;
+ return 0;
+
+e_inval:
+ return -EINVAL;
+}
+
+/*
+ * decode and apply an incremental map update.
+ */
+struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end, bool msgr2,
+ struct ceph_osdmap *map)
+{
+ struct ceph_fsid fsid;
+ u32 epoch = 0;
+ struct ceph_timespec modified;
+ s32 len;
+ u64 pool;
+ __s64 new_pool_max;
+ __s32 new_flags, max;
+ void *start = *p;
+ int err;
+ u8 struct_v;
+
+ dout("%s %p to %p len %d\n", __func__, *p, end, (int)(end - *p));
+
+ err = get_osdmap_client_data_v(p, end, "inc", &struct_v);
+ if (err)
+ goto bad;
+
+ /* fsid, epoch, modified, new_pool_max, new_flags */
+ ceph_decode_need(p, end, sizeof(fsid) + sizeof(u32) + sizeof(modified) +
+ sizeof(u64) + sizeof(u32), e_inval);
+ ceph_decode_copy(p, &fsid, sizeof(fsid));
+ epoch = ceph_decode_32(p);
+ BUG_ON(epoch != map->epoch+1);
+ ceph_decode_copy(p, &modified, sizeof(modified));
+ new_pool_max = ceph_decode_64(p);
+ new_flags = ceph_decode_32(p);
+
+ /* full map? */
+ ceph_decode_32_safe(p, end, len, e_inval);
+ if (len > 0) {
+ dout("apply_incremental full map len %d, %p to %p\n",
+ len, *p, end);
+ return ceph_osdmap_decode(p, min(*p+len, end), msgr2);
+ }
+
+ /* new crush? */
+ ceph_decode_32_safe(p, end, len, e_inval);
+ if (len > 0) {
+ err = osdmap_set_crush(map,
+ crush_decode(*p, min(*p + len, end)));
+ if (err)
+ goto bad;
+ *p += len;
+ }
+
+ /* new flags? */
+ if (new_flags >= 0)
+ map->flags = new_flags;
+ if (new_pool_max >= 0)
+ map->pool_max = new_pool_max;
+
+ /* new max? */
+ ceph_decode_32_safe(p, end, max, e_inval);
+ if (max >= 0) {
+ err = osdmap_set_max_osd(map, max);
+ if (err)
+ goto bad;
+ }
+
+ map->epoch++;
+ map->modified = modified;
+
+ /* new_pools */
+ err = decode_new_pools(p, end, map);
+ if (err)
+ goto bad;
+
+ /* new_pool_names */
+ err = decode_pool_names(p, end, map);
+ if (err)
+ goto bad;
+
+ /* old_pool */
+ ceph_decode_32_safe(p, end, len, e_inval);
+ while (len--) {
+ struct ceph_pg_pool_info *pi;
+
+ ceph_decode_64_safe(p, end, pool, e_inval);
+ pi = lookup_pg_pool(&map->pg_pools, pool);
+ if (pi)
+ __remove_pg_pool(&map->pg_pools, pi);
+ }
+
+ /* new_up_client, new_state, new_weight */
+ err = decode_new_up_state_weight(p, end, struct_v, msgr2, map);
+ if (err)
+ goto bad;
+
+ /* new_pg_temp */
+ err = decode_new_pg_temp(p, end, map);
+ if (err)
+ goto bad;
+
+ /* new_primary_temp */
+ if (struct_v >= 1) {
+ err = decode_new_primary_temp(p, end, map);
+ if (err)
+ goto bad;
+ }
+
+ /* new_primary_affinity */
+ if (struct_v >= 2) {
+ err = decode_new_primary_affinity(p, end, map);
+ if (err)
+ goto bad;
+ }
+
+ if (struct_v >= 3) {
+ /* new_erasure_code_profiles */
+ ceph_decode_skip_map_of_map(p, end, string, string, string,
+ e_inval);
+ /* old_erasure_code_profiles */
+ ceph_decode_skip_set(p, end, string, e_inval);
+ }
+
+ if (struct_v >= 4) {
+ err = decode_new_pg_upmap(p, end, map);
+ if (err)
+ goto bad;
+
+ err = decode_old_pg_upmap(p, end, map);
+ if (err)
+ goto bad;
+
+ err = decode_new_pg_upmap_items(p, end, map);
+ if (err)
+ goto bad;
+
+ err = decode_old_pg_upmap_items(p, end, map);
+ if (err)
+ goto bad;
+ }
+
+ /* ignore the rest */
+ *p = end;
+
+ dout("inc osdmap epoch %d max_osd %d\n", map->epoch, map->max_osd);
+ return map;
+
+e_inval:
+ err = -EINVAL;
+bad:
+ pr_err("corrupt inc osdmap (%d) epoch %d off %d (%p of %p-%p)\n",
+ err, epoch, (int)(*p - start), *p, start, end);
+ print_hex_dump(KERN_DEBUG, "osdmap: ",
+ DUMP_PREFIX_OFFSET, 16, 1,
+ start, end - start, true);
+ return ERR_PTR(err);
+}
+
+void ceph_oloc_copy(struct ceph_object_locator *dest,
+ const struct ceph_object_locator *src)
+{
+ ceph_oloc_destroy(dest);
+
+ dest->pool = src->pool;
+ if (src->pool_ns)
+ dest->pool_ns = ceph_get_string(src->pool_ns);
+ else
+ dest->pool_ns = NULL;
+}
+EXPORT_SYMBOL(ceph_oloc_copy);
+
+void ceph_oloc_destroy(struct ceph_object_locator *oloc)
+{
+ ceph_put_string(oloc->pool_ns);
+}
+EXPORT_SYMBOL(ceph_oloc_destroy);
+
+void ceph_oid_copy(struct ceph_object_id *dest,
+ const struct ceph_object_id *src)
+{
+ ceph_oid_destroy(dest);
+
+ if (src->name != src->inline_name) {
+ /* very rare, see ceph_object_id definition */
+ dest->name = kmalloc(src->name_len + 1,
+ GFP_NOIO | __GFP_NOFAIL);
+ } else {
+ dest->name = dest->inline_name;
+ }
+ memcpy(dest->name, src->name, src->name_len + 1);
+ dest->name_len = src->name_len;
+}
+EXPORT_SYMBOL(ceph_oid_copy);
+
+static __printf(2, 0)
+int oid_printf_vargs(struct ceph_object_id *oid, const char *fmt, va_list ap)
+{
+ int len;
+
+ WARN_ON(!ceph_oid_empty(oid));
+
+ len = vsnprintf(oid->inline_name, sizeof(oid->inline_name), fmt, ap);
+ if (len >= sizeof(oid->inline_name))
+ return len;
+
+ oid->name_len = len;
+ return 0;
+}
+
+/*
+ * If oid doesn't fit into inline buffer, BUG.
+ */
+void ceph_oid_printf(struct ceph_object_id *oid, const char *fmt, ...)
+{
+ va_list ap;
+
+ va_start(ap, fmt);
+ BUG_ON(oid_printf_vargs(oid, fmt, ap));
+ va_end(ap);
+}
+EXPORT_SYMBOL(ceph_oid_printf);
+
+static __printf(3, 0)
+int oid_aprintf_vargs(struct ceph_object_id *oid, gfp_t gfp,
+ const char *fmt, va_list ap)
+{
+ va_list aq;
+ int len;
+
+ va_copy(aq, ap);
+ len = oid_printf_vargs(oid, fmt, aq);
+ va_end(aq);
+
+ if (len) {
+ char *external_name;
+
+ external_name = kmalloc(len + 1, gfp);
+ if (!external_name)
+ return -ENOMEM;
+
+ oid->name = external_name;
+ WARN_ON(vsnprintf(oid->name, len + 1, fmt, ap) != len);
+ oid->name_len = len;
+ }
+
+ return 0;
+}
+
+/*
+ * If oid doesn't fit into inline buffer, allocate.
+ */
+int ceph_oid_aprintf(struct ceph_object_id *oid, gfp_t gfp,
+ const char *fmt, ...)
+{
+ va_list ap;
+ int ret;
+
+ va_start(ap, fmt);
+ ret = oid_aprintf_vargs(oid, gfp, fmt, ap);
+ va_end(ap);
+
+ return ret;
+}
+EXPORT_SYMBOL(ceph_oid_aprintf);
+
+void ceph_oid_destroy(struct ceph_object_id *oid)
+{
+ if (oid->name != oid->inline_name)
+ kfree(oid->name);
+}
+EXPORT_SYMBOL(ceph_oid_destroy);
+
+/*
+ * osds only
+ */
+static bool __osds_equal(const struct ceph_osds *lhs,
+ const struct ceph_osds *rhs)
+{
+ if (lhs->size == rhs->size &&
+ !memcmp(lhs->osds, rhs->osds, rhs->size * sizeof(rhs->osds[0])))
+ return true;
+
+ return false;
+}
+
+/*
+ * osds + primary
+ */
+static bool osds_equal(const struct ceph_osds *lhs,
+ const struct ceph_osds *rhs)
+{
+ if (__osds_equal(lhs, rhs) &&
+ lhs->primary == rhs->primary)
+ return true;
+
+ return false;
+}
+
+static bool osds_valid(const struct ceph_osds *set)
+{
+ /* non-empty set */
+ if (set->size > 0 && set->primary >= 0)
+ return true;
+
+ /* empty can_shift_osds set */
+ if (!set->size && set->primary == -1)
+ return true;
+
+ /* empty !can_shift_osds set - all NONE */
+ if (set->size > 0 && set->primary == -1) {
+ int i;
+
+ for (i = 0; i < set->size; i++) {
+ if (set->osds[i] != CRUSH_ITEM_NONE)
+ break;
+ }
+ if (i == set->size)
+ return true;
+ }
+
+ return false;
+}
+
+void ceph_osds_copy(struct ceph_osds *dest, const struct ceph_osds *src)
+{
+ memcpy(dest->osds, src->osds, src->size * sizeof(src->osds[0]));
+ dest->size = src->size;
+ dest->primary = src->primary;
+}
+
+bool ceph_pg_is_split(const struct ceph_pg *pgid, u32 old_pg_num,
+ u32 new_pg_num)
+{
+ int old_bits = calc_bits_of(old_pg_num);
+ int old_mask = (1 << old_bits) - 1;
+ int n;
+
+ WARN_ON(pgid->seed >= old_pg_num);
+ if (new_pg_num <= old_pg_num)
+ return false;
+
+ for (n = 1; ; n++) {
+ int next_bit = n << (old_bits - 1);
+ u32 s = next_bit | pgid->seed;
+
+ if (s < old_pg_num || s == pgid->seed)
+ continue;
+ if (s >= new_pg_num)
+ break;
+
+ s = ceph_stable_mod(s, old_pg_num, old_mask);
+ if (s == pgid->seed)
+ return true;
+ }
+
+ return false;
+}
+
+bool ceph_is_new_interval(const struct ceph_osds *old_acting,
+ const struct ceph_osds *new_acting,
+ const struct ceph_osds *old_up,
+ const struct ceph_osds *new_up,
+ int old_size,
+ int new_size,
+ int old_min_size,
+ int new_min_size,
+ u32 old_pg_num,
+ u32 new_pg_num,
+ bool old_sort_bitwise,
+ bool new_sort_bitwise,
+ bool old_recovery_deletes,
+ bool new_recovery_deletes,
+ const struct ceph_pg *pgid)
+{
+ return !osds_equal(old_acting, new_acting) ||
+ !osds_equal(old_up, new_up) ||
+ old_size != new_size ||
+ old_min_size != new_min_size ||
+ ceph_pg_is_split(pgid, old_pg_num, new_pg_num) ||
+ old_sort_bitwise != new_sort_bitwise ||
+ old_recovery_deletes != new_recovery_deletes;
+}
+
+static int calc_pg_rank(int osd, const struct ceph_osds *acting)
+{
+ int i;
+
+ for (i = 0; i < acting->size; i++) {
+ if (acting->osds[i] == osd)
+ return i;
+ }
+
+ return -1;
+}
+
+static bool primary_changed(const struct ceph_osds *old_acting,
+ const struct ceph_osds *new_acting)
+{
+ if (!old_acting->size && !new_acting->size)
+ return false; /* both still empty */
+
+ if (!old_acting->size ^ !new_acting->size)
+ return true; /* was empty, now not, or vice versa */
+
+ if (old_acting->primary != new_acting->primary)
+ return true; /* primary changed */
+
+ if (calc_pg_rank(old_acting->primary, old_acting) !=
+ calc_pg_rank(new_acting->primary, new_acting))
+ return true;
+
+ return false; /* same primary (tho replicas may have changed) */
+}
+
+bool ceph_osds_changed(const struct ceph_osds *old_acting,
+ const struct ceph_osds *new_acting,
+ bool any_change)
+{
+ if (primary_changed(old_acting, new_acting))
+ return true;
+
+ if (any_change && !__osds_equal(old_acting, new_acting))
+ return true;
+
+ return false;
+}
+
+/*
+ * Map an object into a PG.
+ *
+ * Should only be called with target_oid and target_oloc (as opposed to
+ * base_oid and base_oloc), since tiering isn't taken into account.
+ */
+void __ceph_object_locator_to_pg(struct ceph_pg_pool_info *pi,
+ const struct ceph_object_id *oid,
+ const struct ceph_object_locator *oloc,
+ struct ceph_pg *raw_pgid)
+{
+ WARN_ON(pi->id != oloc->pool);
+
+ if (!oloc->pool_ns) {
+ raw_pgid->pool = oloc->pool;
+ raw_pgid->seed = ceph_str_hash(pi->object_hash, oid->name,
+ oid->name_len);
+ dout("%s %s -> raw_pgid %llu.%x\n", __func__, oid->name,
+ raw_pgid->pool, raw_pgid->seed);
+ } else {
+ char stack_buf[256];
+ char *buf = stack_buf;
+ int nsl = oloc->pool_ns->len;
+ size_t total = nsl + 1 + oid->name_len;
+
+ if (total > sizeof(stack_buf))
+ buf = kmalloc(total, GFP_NOIO | __GFP_NOFAIL);
+ memcpy(buf, oloc->pool_ns->str, nsl);
+ buf[nsl] = '\037';
+ memcpy(buf + nsl + 1, oid->name, oid->name_len);
+ raw_pgid->pool = oloc->pool;
+ raw_pgid->seed = ceph_str_hash(pi->object_hash, buf, total);
+ if (buf != stack_buf)
+ kfree(buf);
+ dout("%s %s ns %.*s -> raw_pgid %llu.%x\n", __func__,
+ oid->name, nsl, oloc->pool_ns->str,
+ raw_pgid->pool, raw_pgid->seed);
+ }
+}
+
+int ceph_object_locator_to_pg(struct ceph_osdmap *osdmap,
+ const struct ceph_object_id *oid,
+ const struct ceph_object_locator *oloc,
+ struct ceph_pg *raw_pgid)
+{
+ struct ceph_pg_pool_info *pi;
+
+ pi = ceph_pg_pool_by_id(osdmap, oloc->pool);
+ if (!pi)
+ return -ENOENT;
+
+ __ceph_object_locator_to_pg(pi, oid, oloc, raw_pgid);
+ return 0;
+}
+EXPORT_SYMBOL(ceph_object_locator_to_pg);
+
+/*
+ * Map a raw PG (full precision ps) into an actual PG.
+ */
+static void raw_pg_to_pg(struct ceph_pg_pool_info *pi,
+ const struct ceph_pg *raw_pgid,
+ struct ceph_pg *pgid)
+{
+ pgid->pool = raw_pgid->pool;
+ pgid->seed = ceph_stable_mod(raw_pgid->seed, pi->pg_num,
+ pi->pg_num_mask);
+}
+
+/*
+ * Map a raw PG (full precision ps) into a placement ps (placement
+ * seed). Include pool id in that value so that different pools don't
+ * use the same seeds.
+ */
+static u32 raw_pg_to_pps(struct ceph_pg_pool_info *pi,
+ const struct ceph_pg *raw_pgid)
+{
+ if (pi->flags & CEPH_POOL_FLAG_HASHPSPOOL) {
+ /* hash pool id and seed so that pool PGs do not overlap */
+ return crush_hash32_2(CRUSH_HASH_RJENKINS1,
+ ceph_stable_mod(raw_pgid->seed,
+ pi->pgp_num,
+ pi->pgp_num_mask),
+ raw_pgid->pool);
+ } else {
+ /*
+ * legacy behavior: add ps and pool together. this is
+ * not a great approach because the PGs from each pool
+ * will overlap on top of each other: 0.5 == 1.4 ==
+ * 2.3 == ...
+ */
+ return ceph_stable_mod(raw_pgid->seed, pi->pgp_num,
+ pi->pgp_num_mask) +
+ (unsigned)raw_pgid->pool;
+ }
+}
+
+/*
+ * Magic value used for a "default" fallback choose_args, used if the
+ * crush_choose_arg_map passed to do_crush() does not exist. If this
+ * also doesn't exist, fall back to canonical weights.
+ */
+#define CEPH_DEFAULT_CHOOSE_ARGS -1
+
+static int do_crush(struct ceph_osdmap *map, int ruleno, int x,
+ int *result, int result_max,
+ const __u32 *weight, int weight_max,
+ s64 choose_args_index)
+{
+ struct crush_choose_arg_map *arg_map;
+ struct crush_work *work;
+ int r;
+
+ BUG_ON(result_max > CEPH_PG_MAX_SIZE);
+
+ arg_map = lookup_choose_arg_map(&map->crush->choose_args,
+ choose_args_index);
+ if (!arg_map)
+ arg_map = lookup_choose_arg_map(&map->crush->choose_args,
+ CEPH_DEFAULT_CHOOSE_ARGS);
+
+ work = get_workspace(&map->crush_wsm, map->crush);
+ r = crush_do_rule(map->crush, ruleno, x, result, result_max,
+ weight, weight_max, work,
+ arg_map ? arg_map->args : NULL);
+ put_workspace(&map->crush_wsm, work);
+ return r;
+}
+
+static void remove_nonexistent_osds(struct ceph_osdmap *osdmap,
+ struct ceph_pg_pool_info *pi,
+ struct ceph_osds *set)
+{
+ int i;
+
+ if (ceph_can_shift_osds(pi)) {
+ int removed = 0;
+
+ /* shift left */
+ for (i = 0; i < set->size; i++) {
+ if (!ceph_osd_exists(osdmap, set->osds[i])) {
+ removed++;
+ continue;
+ }
+ if (removed)
+ set->osds[i - removed] = set->osds[i];
+ }
+ set->size -= removed;
+ } else {
+ /* set dne devices to NONE */
+ for (i = 0; i < set->size; i++) {
+ if (!ceph_osd_exists(osdmap, set->osds[i]))
+ set->osds[i] = CRUSH_ITEM_NONE;
+ }
+ }
+}
+
+/*
+ * Calculate raw set (CRUSH output) for given PG and filter out
+ * nonexistent OSDs. ->primary is undefined for a raw set.
+ *
+ * Placement seed (CRUSH input) is returned through @ppps.
+ */
+static void pg_to_raw_osds(struct ceph_osdmap *osdmap,
+ struct ceph_pg_pool_info *pi,
+ const struct ceph_pg *raw_pgid,
+ struct ceph_osds *raw,
+ u32 *ppps)
+{
+ u32 pps = raw_pg_to_pps(pi, raw_pgid);
+ int ruleno;
+ int len;
+
+ ceph_osds_init(raw);
+ if (ppps)
+ *ppps = pps;
+
+ ruleno = crush_find_rule(osdmap->crush, pi->crush_ruleset, pi->type,
+ pi->size);
+ if (ruleno < 0) {
+ pr_err("no crush rule: pool %lld ruleset %d type %d size %d\n",
+ pi->id, pi->crush_ruleset, pi->type, pi->size);
+ return;
+ }
+
+ if (pi->size > ARRAY_SIZE(raw->osds)) {
+ pr_err_ratelimited("pool %lld ruleset %d type %d too wide: size %d > %zu\n",
+ pi->id, pi->crush_ruleset, pi->type, pi->size,
+ ARRAY_SIZE(raw->osds));
+ return;
+ }
+
+ len = do_crush(osdmap, ruleno, pps, raw->osds, pi->size,
+ osdmap->osd_weight, osdmap->max_osd, pi->id);
+ if (len < 0) {
+ pr_err("error %d from crush rule %d: pool %lld ruleset %d type %d size %d\n",
+ len, ruleno, pi->id, pi->crush_ruleset, pi->type,
+ pi->size);
+ return;
+ }
+
+ raw->size = len;
+ remove_nonexistent_osds(osdmap, pi, raw);
+}
+
+/* apply pg_upmap[_items] mappings */
+static void apply_upmap(struct ceph_osdmap *osdmap,
+ const struct ceph_pg *pgid,
+ struct ceph_osds *raw)
+{
+ struct ceph_pg_mapping *pg;
+ int i, j;
+
+ pg = lookup_pg_mapping(&osdmap->pg_upmap, pgid);
+ if (pg) {
+ /* make sure targets aren't marked out */
+ for (i = 0; i < pg->pg_upmap.len; i++) {
+ int osd = pg->pg_upmap.osds[i];
+
+ if (osd != CRUSH_ITEM_NONE &&
+ osd < osdmap->max_osd &&
+ osdmap->osd_weight[osd] == 0) {
+ /* reject/ignore explicit mapping */
+ return;
+ }
+ }
+ for (i = 0; i < pg->pg_upmap.len; i++)
+ raw->osds[i] = pg->pg_upmap.osds[i];
+ raw->size = pg->pg_upmap.len;
+ /* check and apply pg_upmap_items, if any */
+ }
+
+ pg = lookup_pg_mapping(&osdmap->pg_upmap_items, pgid);
+ if (pg) {
+ /*
+ * Note: this approach does not allow a bidirectional swap,
+ * e.g., [[1,2],[2,1]] applied to [0,1,2] -> [0,2,1].
+ */
+ for (i = 0; i < pg->pg_upmap_items.len; i++) {
+ int from = pg->pg_upmap_items.from_to[i][0];
+ int to = pg->pg_upmap_items.from_to[i][1];
+ int pos = -1;
+ bool exists = false;
+
+ /* make sure replacement doesn't already appear */
+ for (j = 0; j < raw->size; j++) {
+ int osd = raw->osds[j];
+
+ if (osd == to) {
+ exists = true;
+ break;
+ }
+ /* ignore mapping if target is marked out */
+ if (osd == from && pos < 0 &&
+ !(to != CRUSH_ITEM_NONE &&
+ to < osdmap->max_osd &&
+ osdmap->osd_weight[to] == 0)) {
+ pos = j;
+ }
+ }
+ if (!exists && pos >= 0)
+ raw->osds[pos] = to;
+ }
+ }
+}
+
+/*
+ * Given raw set, calculate up set and up primary. By definition of an
+ * up set, the result won't contain nonexistent or down OSDs.
+ *
+ * This is done in-place - on return @set is the up set. If it's
+ * empty, ->primary will remain undefined.
+ */
+static void raw_to_up_osds(struct ceph_osdmap *osdmap,
+ struct ceph_pg_pool_info *pi,
+ struct ceph_osds *set)
+{
+ int i;
+
+ /* ->primary is undefined for a raw set */
+ BUG_ON(set->primary != -1);
+
+ if (ceph_can_shift_osds(pi)) {
+ int removed = 0;
+
+ /* shift left */
+ for (i = 0; i < set->size; i++) {
+ if (ceph_osd_is_down(osdmap, set->osds[i])) {
+ removed++;
+ continue;
+ }
+ if (removed)
+ set->osds[i - removed] = set->osds[i];
+ }
+ set->size -= removed;
+ if (set->size > 0)
+ set->primary = set->osds[0];
+ } else {
+ /* set down/dne devices to NONE */
+ for (i = set->size - 1; i >= 0; i--) {
+ if (ceph_osd_is_down(osdmap, set->osds[i]))
+ set->osds[i] = CRUSH_ITEM_NONE;
+ else
+ set->primary = set->osds[i];
+ }
+ }
+}
+
+static void apply_primary_affinity(struct ceph_osdmap *osdmap,
+ struct ceph_pg_pool_info *pi,
+ u32 pps,
+ struct ceph_osds *up)
+{
+ int i;
+ int pos = -1;
+
+ /*
+ * Do we have any non-default primary_affinity values for these
+ * osds?
+ */
+ if (!osdmap->osd_primary_affinity)
+ return;
+
+ for (i = 0; i < up->size; i++) {
+ int osd = up->osds[i];
+
+ if (osd != CRUSH_ITEM_NONE &&
+ osdmap->osd_primary_affinity[osd] !=
+ CEPH_OSD_DEFAULT_PRIMARY_AFFINITY) {
+ break;
+ }
+ }
+ if (i == up->size)
+ return;
+
+ /*
+ * Pick the primary. Feed both the seed (for the pg) and the
+ * osd into the hash/rng so that a proportional fraction of an
+ * osd's pgs get rejected as primary.
+ */
+ for (i = 0; i < up->size; i++) {
+ int osd = up->osds[i];
+ u32 aff;
+
+ if (osd == CRUSH_ITEM_NONE)
+ continue;
+
+ aff = osdmap->osd_primary_affinity[osd];
+ if (aff < CEPH_OSD_MAX_PRIMARY_AFFINITY &&
+ (crush_hash32_2(CRUSH_HASH_RJENKINS1,
+ pps, osd) >> 16) >= aff) {
+ /*
+ * We chose not to use this primary. Note it
+ * anyway as a fallback in case we don't pick
+ * anyone else, but keep looking.
+ */
+ if (pos < 0)
+ pos = i;
+ } else {
+ pos = i;
+ break;
+ }
+ }
+ if (pos < 0)
+ return;
+
+ up->primary = up->osds[pos];
+
+ if (ceph_can_shift_osds(pi) && pos > 0) {
+ /* move the new primary to the front */
+ for (i = pos; i > 0; i--)
+ up->osds[i] = up->osds[i - 1];
+ up->osds[0] = up->primary;
+ }
+}
+
+/*
+ * Get pg_temp and primary_temp mappings for given PG.
+ *
+ * Note that a PG may have none, only pg_temp, only primary_temp or
+ * both pg_temp and primary_temp mappings. This means @temp isn't
+ * always a valid OSD set on return: in the "only primary_temp" case,
+ * @temp will have its ->primary >= 0 but ->size == 0.
+ */
+static void get_temp_osds(struct ceph_osdmap *osdmap,
+ struct ceph_pg_pool_info *pi,
+ const struct ceph_pg *pgid,
+ struct ceph_osds *temp)
+{
+ struct ceph_pg_mapping *pg;
+ int i;
+
+ ceph_osds_init(temp);
+
+ /* pg_temp? */
+ pg = lookup_pg_mapping(&osdmap->pg_temp, pgid);
+ if (pg) {
+ for (i = 0; i < pg->pg_temp.len; i++) {
+ if (ceph_osd_is_down(osdmap, pg->pg_temp.osds[i])) {
+ if (ceph_can_shift_osds(pi))
+ continue;
+
+ temp->osds[temp->size++] = CRUSH_ITEM_NONE;
+ } else {
+ temp->osds[temp->size++] = pg->pg_temp.osds[i];
+ }
+ }
+
+ /* apply pg_temp's primary */
+ for (i = 0; i < temp->size; i++) {
+ if (temp->osds[i] != CRUSH_ITEM_NONE) {
+ temp->primary = temp->osds[i];
+ break;
+ }
+ }
+ }
+
+ /* primary_temp? */
+ pg = lookup_pg_mapping(&osdmap->primary_temp, pgid);
+ if (pg)
+ temp->primary = pg->primary_temp.osd;
+}
+
+/*
+ * Map a PG to its acting set as well as its up set.
+ *
+ * Acting set is used for data mapping purposes, while up set can be
+ * recorded for detecting interval changes and deciding whether to
+ * resend a request.
+ */
+void ceph_pg_to_up_acting_osds(struct ceph_osdmap *osdmap,
+ struct ceph_pg_pool_info *pi,
+ const struct ceph_pg *raw_pgid,
+ struct ceph_osds *up,
+ struct ceph_osds *acting)
+{
+ struct ceph_pg pgid;
+ u32 pps;
+
+ WARN_ON(pi->id != raw_pgid->pool);
+ raw_pg_to_pg(pi, raw_pgid, &pgid);
+
+ pg_to_raw_osds(osdmap, pi, raw_pgid, up, &pps);
+ apply_upmap(osdmap, &pgid, up);
+ raw_to_up_osds(osdmap, pi, up);
+ apply_primary_affinity(osdmap, pi, pps, up);
+ get_temp_osds(osdmap, pi, &pgid, acting);
+ if (!acting->size) {
+ memcpy(acting->osds, up->osds, up->size * sizeof(up->osds[0]));
+ acting->size = up->size;
+ if (acting->primary == -1)
+ acting->primary = up->primary;
+ }
+ WARN_ON(!osds_valid(up) || !osds_valid(acting));
+}
+
+bool ceph_pg_to_primary_shard(struct ceph_osdmap *osdmap,
+ struct ceph_pg_pool_info *pi,
+ const struct ceph_pg *raw_pgid,
+ struct ceph_spg *spgid)
+{
+ struct ceph_pg pgid;
+ struct ceph_osds up, acting;
+ int i;
+
+ WARN_ON(pi->id != raw_pgid->pool);
+ raw_pg_to_pg(pi, raw_pgid, &pgid);
+
+ if (ceph_can_shift_osds(pi)) {
+ spgid->pgid = pgid; /* struct */
+ spgid->shard = CEPH_SPG_NOSHARD;
+ return true;
+ }
+
+ ceph_pg_to_up_acting_osds(osdmap, pi, &pgid, &up, &acting);
+ for (i = 0; i < acting.size; i++) {
+ if (acting.osds[i] == acting.primary) {
+ spgid->pgid = pgid; /* struct */
+ spgid->shard = i;
+ return true;
+ }
+ }
+
+ return false;
+}
+
+/*
+ * Return acting primary for given PG, or -1 if none.
+ */
+int ceph_pg_to_acting_primary(struct ceph_osdmap *osdmap,
+ const struct ceph_pg *raw_pgid)
+{
+ struct ceph_pg_pool_info *pi;
+ struct ceph_osds up, acting;
+
+ pi = ceph_pg_pool_by_id(osdmap, raw_pgid->pool);
+ if (!pi)
+ return -1;
+
+ ceph_pg_to_up_acting_osds(osdmap, pi, raw_pgid, &up, &acting);
+ return acting.primary;
+}
+EXPORT_SYMBOL(ceph_pg_to_acting_primary);
+
+static struct crush_loc_node *alloc_crush_loc(size_t type_name_len,
+ size_t name_len)
+{
+ struct crush_loc_node *loc;
+
+ loc = kmalloc(sizeof(*loc) + type_name_len + name_len + 2, GFP_NOIO);
+ if (!loc)
+ return NULL;
+
+ RB_CLEAR_NODE(&loc->cl_node);
+ return loc;
+}
+
+static void free_crush_loc(struct crush_loc_node *loc)
+{
+ WARN_ON(!RB_EMPTY_NODE(&loc->cl_node));
+
+ kfree(loc);
+}
+
+static int crush_loc_compare(const struct crush_loc *loc1,
+ const struct crush_loc *loc2)
+{
+ return strcmp(loc1->cl_type_name, loc2->cl_type_name) ?:
+ strcmp(loc1->cl_name, loc2->cl_name);
+}
+
+DEFINE_RB_FUNCS2(crush_loc, struct crush_loc_node, cl_loc, crush_loc_compare,
+ RB_BYPTR, const struct crush_loc *, cl_node)
+
+/*
+ * Parses a set of <bucket type name>':'<bucket name> pairs separated
+ * by '|', e.g. "rack:foo1|rack:foo2|datacenter:bar".
+ *
+ * Note that @crush_location is modified by strsep().
+ */
+int ceph_parse_crush_location(char *crush_location, struct rb_root *locs)
+{
+ struct crush_loc_node *loc;
+ const char *type_name, *name, *colon;
+ size_t type_name_len, name_len;
+
+ dout("%s '%s'\n", __func__, crush_location);
+ while ((type_name = strsep(&crush_location, "|"))) {
+ colon = strchr(type_name, ':');
+ if (!colon)
+ return -EINVAL;
+
+ type_name_len = colon - type_name;
+ if (type_name_len == 0)
+ return -EINVAL;
+
+ name = colon + 1;
+ name_len = strlen(name);
+ if (name_len == 0)
+ return -EINVAL;
+
+ loc = alloc_crush_loc(type_name_len, name_len);
+ if (!loc)
+ return -ENOMEM;
+
+ loc->cl_loc.cl_type_name = loc->cl_data;
+ memcpy(loc->cl_loc.cl_type_name, type_name, type_name_len);
+ loc->cl_loc.cl_type_name[type_name_len] = '\0';
+
+ loc->cl_loc.cl_name = loc->cl_data + type_name_len + 1;
+ memcpy(loc->cl_loc.cl_name, name, name_len);
+ loc->cl_loc.cl_name[name_len] = '\0';
+
+ if (!__insert_crush_loc(locs, loc)) {
+ free_crush_loc(loc);
+ return -EEXIST;
+ }
+
+ dout("%s type_name '%s' name '%s'\n", __func__,
+ loc->cl_loc.cl_type_name, loc->cl_loc.cl_name);
+ }
+
+ return 0;
+}
+
+int ceph_compare_crush_locs(struct rb_root *locs1, struct rb_root *locs2)
+{
+ struct rb_node *n1 = rb_first(locs1);
+ struct rb_node *n2 = rb_first(locs2);
+ int ret;
+
+ for ( ; n1 && n2; n1 = rb_next(n1), n2 = rb_next(n2)) {
+ struct crush_loc_node *loc1 =
+ rb_entry(n1, struct crush_loc_node, cl_node);
+ struct crush_loc_node *loc2 =
+ rb_entry(n2, struct crush_loc_node, cl_node);
+
+ ret = crush_loc_compare(&loc1->cl_loc, &loc2->cl_loc);
+ if (ret)
+ return ret;
+ }
+
+ if (!n1 && n2)
+ return -1;
+ if (n1 && !n2)
+ return 1;
+ return 0;
+}
+
+void ceph_clear_crush_locs(struct rb_root *locs)
+{
+ while (!RB_EMPTY_ROOT(locs)) {
+ struct crush_loc_node *loc =
+ rb_entry(rb_first(locs), struct crush_loc_node, cl_node);
+
+ erase_crush_loc(locs, loc);
+ free_crush_loc(loc);
+ }
+}
+
+/*
+ * [a-zA-Z0-9-_.]+
+ */
+static bool is_valid_crush_name(const char *name)
+{
+ do {
+ if (!('a' <= *name && *name <= 'z') &&
+ !('A' <= *name && *name <= 'Z') &&
+ !('0' <= *name && *name <= '9') &&
+ *name != '-' && *name != '_' && *name != '.')
+ return false;
+ } while (*++name != '\0');
+
+ return true;
+}
+
+/*
+ * Gets the parent of an item. Returns its id (<0 because the
+ * parent is always a bucket), type id (>0 for the same reason,
+ * via @parent_type_id) and location (via @parent_loc). If no
+ * parent, returns 0.
+ *
+ * Does a linear search, as there are no parent pointers of any
+ * kind. Note that the result is ambiguous for items that occur
+ * multiple times in the map.
+ */
+static int get_immediate_parent(struct crush_map *c, int id,
+ u16 *parent_type_id,
+ struct crush_loc *parent_loc)
+{
+ struct crush_bucket *b;
+ struct crush_name_node *type_cn, *cn;
+ int i, j;
+
+ for (i = 0; i < c->max_buckets; i++) {
+ b = c->buckets[i];
+ if (!b)
+ continue;
+
+ /* ignore per-class shadow hierarchy */
+ cn = lookup_crush_name(&c->names, b->id);
+ if (!cn || !is_valid_crush_name(cn->cn_name))
+ continue;
+
+ for (j = 0; j < b->size; j++) {
+ if (b->items[j] != id)
+ continue;
+
+ *parent_type_id = b->type;
+ type_cn = lookup_crush_name(&c->type_names, b->type);
+ parent_loc->cl_type_name = type_cn->cn_name;
+ parent_loc->cl_name = cn->cn_name;
+ return b->id;
+ }
+ }
+
+ return 0; /* no parent */
+}
+
+/*
+ * Calculates the locality/distance from an item to a client
+ * location expressed in terms of CRUSH hierarchy as a set of
+ * (bucket type name, bucket name) pairs. Specifically, looks
+ * for the lowest-valued bucket type for which the location of
+ * @id matches one of the locations in @locs, so for standard
+ * bucket types (host = 1, rack = 3, datacenter = 8, zone = 9)
+ * a matching host is closer than a matching rack and a matching
+ * data center is closer than a matching zone.
+ *
+ * Specifying multiple locations (a "multipath" location) such
+ * as "rack=foo1 rack=foo2 datacenter=bar" is allowed -- @locs
+ * is a multimap. The locality will be:
+ *
+ * - 3 for OSDs in racks foo1 and foo2
+ * - 8 for OSDs in data center bar
+ * - -1 for all other OSDs
+ *
+ * The lowest possible bucket type is 1, so the best locality
+ * for an OSD is 1 (i.e. a matching host). Locality 0 would be
+ * the OSD itself.
+ */
+int ceph_get_crush_locality(struct ceph_osdmap *osdmap, int id,
+ struct rb_root *locs)
+{
+ struct crush_loc loc;
+ u16 type_id;
+
+ /*
+ * Instead of repeated get_immediate_parent() calls,
+ * the location of @id could be obtained with a single
+ * depth-first traversal.
+ */
+ for (;;) {
+ id = get_immediate_parent(osdmap->crush, id, &type_id, &loc);
+ if (id >= 0)
+ return -1; /* not local */
+
+ if (lookup_crush_loc(locs, &loc))
+ return type_id;
+ }
+}