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libceph: read_from_replica option

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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>
This commit is contained in:
Ilya Dryomov 2020-05-23 11:47:33 +02:00
parent 117d96a04f
commit 8ad44d5e0d
3 changed files with 45 additions and 1 deletions
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2
include/linux/ceph/libceph.h
View File

@ -53,6 +53,8 @@ struct ceph_options {
unsigned long osd_keepalive_timeout; /* jiffies */
unsigned long osd_request_timeout; /* jiffies */
u32 osd_req_flags; /* CEPH_OSD_FLAG_*, applied to each OSD request */
/*
* any type that can't be simply compared or doesn't need
* to be compared should go beyond this point,

39
net/ceph/ceph_common.c
View File

@ -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);

5
net/ceph/osd_client.c
View File

@ -2425,11 +2425,14 @@ static void __submit_request(struct ceph_osd_request *req, bool wrlocked)
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();