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authorIlya Dryomov <idryomov@gmail.com>2020-05-23 11:47:33 +0200
committerIlya Dryomov <idryomov@gmail.com>2020-06-01 13:22:53 +0200
commit8ad44d5e0d1eda7e4a0ed382174888476dc81789 (patch)
tree5b689315243f7a3e17ba623464da95bade93c732 /net/ceph
parent117d96a04f007ce8fc2e292369056c3bd09f6f63 (diff)
libceph: read_from_replica option
Expose replica reads through read_from_replica=balance and read_from_replica=localize. The default is to read from primary (read_from_replica=no). 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.c39
-rw-r--r--net/ceph/osd_client.c5
2 files changed, 43 insertions, 1 deletions
diff --git a/net/ceph/ceph_common.c b/net/ceph/ceph_common.c
index 44770b60bc38..9bab3e9a039b 100644
--- a/net/ceph/ceph_common.c
+++ b/net/ceph/ceph_common.c
@@ -265,6 +265,7 @@ enum {
Opt_key,
Opt_ip,
Opt_crush_location,
+ Opt_read_from_replica,
/* string args above */
Opt_share,
Opt_crc,
@@ -274,6 +275,19 @@ enum {
Opt_abort_on_full,
};
+enum {
+ Opt_read_from_replica_no,
+ Opt_read_from_replica_balance,
+ Opt_read_from_replica_localize,
+};
+
+static const struct constant_table ceph_param_read_from_replica[] = {
+ {"no", Opt_read_from_replica_no},
+ {"balance", Opt_read_from_replica_balance},
+ {"localize", Opt_read_from_replica_localize},
+ {}
+};
+
static const struct fs_parameter_spec ceph_parameters[] = {
fsparam_flag ("abort_on_full", Opt_abort_on_full),
fsparam_flag_no ("cephx_require_signatures", Opt_cephx_require_signatures),
@@ -290,6 +304,8 @@ static const struct fs_parameter_spec ceph_parameters[] = {
fsparam_u32 ("osdkeepalive", Opt_osdkeepalivetimeout),
__fsparam (fs_param_is_s32, "osdtimeout", Opt_osdtimeout,
fs_param_deprecated, NULL),
+ fsparam_enum ("read_from_replica", Opt_read_from_replica,
+ ceph_param_read_from_replica),
fsparam_string ("secret", Opt_secret),
fsparam_flag_no ("share", Opt_share),
fsparam_flag_no ("tcp_nodelay", Opt_tcp_nodelay),
@@ -472,6 +488,24 @@ int ceph_parse_param(struct fs_parameter *param, struct ceph_options *opt,
return err;
}
break;
+ case Opt_read_from_replica:
+ switch (result.uint_32) {
+ case Opt_read_from_replica_no:
+ opt->osd_req_flags &= ~(CEPH_OSD_FLAG_BALANCE_READS |
+ CEPH_OSD_FLAG_LOCALIZE_READS);
+ break;
+ case Opt_read_from_replica_balance:
+ opt->osd_req_flags |= CEPH_OSD_FLAG_BALANCE_READS;
+ opt->osd_req_flags &= ~CEPH_OSD_FLAG_LOCALIZE_READS;
+ break;
+ case Opt_read_from_replica_localize:
+ opt->osd_req_flags |= CEPH_OSD_FLAG_LOCALIZE_READS;
+ opt->osd_req_flags &= ~CEPH_OSD_FLAG_BALANCE_READS;
+ break;
+ default:
+ BUG();
+ }
+ break;
case Opt_osdtimeout:
warn_plog(&log, "Ignoring osdtimeout");
@@ -580,6 +614,11 @@ int ceph_print_client_options(struct seq_file *m, struct ceph_client *client,
}
seq_putc(m, ',');
}
+ if (opt->osd_req_flags & CEPH_OSD_FLAG_BALANCE_READS) {
+ seq_puts(m, "read_from_replica=balance,");
+ } else if (opt->osd_req_flags & CEPH_OSD_FLAG_LOCALIZE_READS) {
+ seq_puts(m, "read_from_replica=localize,");
+ }
if (opt->flags & CEPH_OPT_FSID)
seq_printf(m, "fsid=%pU,", &opt->fsid);
diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c
index 4ce6cdc744e4..22733e844be1 100644
--- a/net/ceph/osd_client.c
+++ b/net/ceph/osd_client.c
@@ -2425,11 +2425,14 @@ promote:
static void account_request(struct ceph_osd_request *req)
{
+ struct ceph_osd_client *osdc = req->r_osdc;
+
WARN_ON(req->r_flags & (CEPH_OSD_FLAG_ACK | CEPH_OSD_FLAG_ONDISK));
WARN_ON(!(req->r_flags & (CEPH_OSD_FLAG_READ | CEPH_OSD_FLAG_WRITE)));
req->r_flags |= CEPH_OSD_FLAG_ONDISK;
- atomic_inc(&req->r_osdc->num_requests);
+ req->r_flags |= osdc->client->options->osd_req_flags;
+ atomic_inc(&osdc->num_requests);
req->r_start_stamp = jiffies;
req->r_start_latency = ktime_get();