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| author | Ilya Dryomov <idryomov@gmail.com> | 2020-05-23 12:47:33 +0300 |
|---|---|---|
| committer | Ilya Dryomov <idryomov@gmail.com> | 2020-06-01 14:22:53 +0300 |
| commit | 8ad44d5e0d1eda7e4a0ed382174888476dc81789 (patch) | |
| tree | 5b689315243f7a3e17ba623464da95bade93c732 /net/ceph | |
| parent | 117d96a04f007ce8fc2e292369056c3bd09f6f63 (diff) | |
| download | linux-8ad44d5e0d1eda7e4a0ed382174888476dc81789.tar.xz | |
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.c | 39 | ||||
| -rw-r--r-- | net/ceph/osd_client.c | 5 |
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(); |