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authorIlya Dryomov <idryomov@gmail.com>2020-05-22 15:24:53 +0200
committerIlya Dryomov <idryomov@gmail.com>2020-06-01 13:22:53 +0200
commit45e6aa9f5592cd127367074f4822039cd8a825c3 (patch)
treec76d86a35c3aa9b67112060635093369d20b577c /net/ceph
parent86403a92c3c5c6c395983fdbfc5e2f29dc39279b (diff)
downloadlinux-45e6aa9f5592cd127367074f4822039cd8a825c3.tar.bz2
libceph: crush_location infrastructure
Allow expressing client's location in terms of CRUSH hierarchy as a set of (bucket type name, bucket name) pairs. The userspace syntax "crush_location = key1=value1 key2=value2" is incompatible with mount options and needed adaptation. Key-value pairs are separated by '|' and we use ':' instead of '=' to separate keys from values. So for: crush_location = host=foo rack=bar one would write: crush_location=host:foo|rack:bar As in userspace, "multipath" locations are supported, so indicating locality for parallel hierarchies is possible: crush_location=rack:foo1|rack:foo2|datacenter:bar Signed-off-by: Ilya Dryomov <idryomov@gmail.com> Reviewed-by: Jeff Layton <jlayton@kernel.org>
Diffstat (limited to 'net/ceph')
-rw-r--r--net/ceph/ceph_common.c36
-rw-r--r--net/ceph/osdmap.c116
2 files changed, 152 insertions, 0 deletions
diff --git a/net/ceph/ceph_common.c b/net/ceph/ceph_common.c
index a0e97f6c1072..44770b60bc38 100644
--- a/net/ceph/ceph_common.c
+++ b/net/ceph/ceph_common.c
@@ -176,6 +176,10 @@ int ceph_compare_options(struct ceph_options *new_opt,
}
}
+ ret = ceph_compare_crush_locs(&opt1->crush_locs, &opt2->crush_locs);
+ if (ret)
+ return ret;
+
/* any matching mon ip implies a match */
for (i = 0; i < opt1->num_mon; i++) {
if (ceph_monmap_contains(client->monc.monmap,
@@ -260,6 +264,7 @@ enum {
Opt_secret,
Opt_key,
Opt_ip,
+ Opt_crush_location,
/* string args above */
Opt_share,
Opt_crc,
@@ -274,6 +279,7 @@ static const struct fs_parameter_spec ceph_parameters[] = {
fsparam_flag_no ("cephx_require_signatures", Opt_cephx_require_signatures),
fsparam_flag_no ("cephx_sign_messages", Opt_cephx_sign_messages),
fsparam_flag_no ("crc", Opt_crc),
+ fsparam_string ("crush_location", Opt_crush_location),
fsparam_string ("fsid", Opt_fsid),
fsparam_string ("ip", Opt_ip),
fsparam_string ("key", Opt_key),
@@ -298,6 +304,7 @@ struct ceph_options *ceph_alloc_options(void)
if (!opt)
return NULL;
+ opt->crush_locs = RB_ROOT;
opt->mon_addr = kcalloc(CEPH_MAX_MON, sizeof(*opt->mon_addr),
GFP_KERNEL);
if (!opt->mon_addr) {
@@ -320,6 +327,7 @@ void ceph_destroy_options(struct ceph_options *opt)
if (!opt)
return;
+ ceph_clear_crush_locs(&opt->crush_locs);
kfree(opt->name);
if (opt->key) {
ceph_crypto_key_destroy(opt->key);
@@ -454,6 +462,16 @@ int ceph_parse_param(struct fs_parameter *param, struct ceph_options *opt,
if (!opt->key)
return -ENOMEM;
return get_secret(opt->key, param->string, &log);
+ case Opt_crush_location:
+ ceph_clear_crush_locs(&opt->crush_locs);
+ err = ceph_parse_crush_location(param->string,
+ &opt->crush_locs);
+ if (err) {
+ error_plog(&log, "Failed to parse CRUSH location: %d",
+ err);
+ return err;
+ }
+ break;
case Opt_osdtimeout:
warn_plog(&log, "Ignoring osdtimeout");
@@ -536,6 +554,7 @@ int ceph_print_client_options(struct seq_file *m, struct ceph_client *client,
{
struct ceph_options *opt = client->options;
size_t pos = m->count;
+ struct rb_node *n;
if (opt->name) {
seq_puts(m, "name=");
@@ -545,6 +564,23 @@ int ceph_print_client_options(struct seq_file *m, struct ceph_client *client,
if (opt->key)
seq_puts(m, "secret=<hidden>,");
+ if (!RB_EMPTY_ROOT(&opt->crush_locs)) {
+ seq_puts(m, "crush_location=");
+ for (n = rb_first(&opt->crush_locs); ; ) {
+ struct crush_loc_node *loc =
+ rb_entry(n, struct crush_loc_node, cl_node);
+
+ seq_printf(m, "%s:%s", loc->cl_loc.cl_type_name,
+ loc->cl_loc.cl_name);
+ n = rb_next(n);
+ if (!n)
+ break;
+
+ seq_putc(m, '|');
+ }
+ seq_putc(m, ',');
+ }
+
if (opt->flags & CEPH_OPT_FSID)
seq_printf(m, "fsid=%pU,", &opt->fsid);
if (opt->flags & CEPH_OPT_NOSHARE)
diff --git a/net/ceph/osdmap.c b/net/ceph/osdmap.c
index e74130876d3a..4b81334e9e5b 100644
--- a/net/ceph/osdmap.c
+++ b/net/ceph/osdmap.c
@@ -2715,3 +2715,119 @@ int ceph_pg_to_acting_primary(struct ceph_osdmap *osdmap,
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);
+ }
+}