diff options
| author | Philipp Reisner <philipp.reisner@linbit.com> | 2011-11-11 12:31:20 +0100 |
|---|---|---|
| committer | Philipp Reisner <philipp.reisner@linbit.com> | 2012-11-08 16:58:10 +0100 |
| commit | 380207d08e7c4d1b19c0323777278992b4fbf9d6 (patch) | |
| tree | 3a35f3543810eb2a7d87f15dd62a8fe8e13aad76 /include/linux | |
| parent | d10b4ea32bf2b77a3d56a20992cd549978df7b38 (diff) | |
drbd: Load balancing of read requests
New config option for the disk secition "read-balancing", with
the values: prefer-local, prefer-remote, round-robin, when-congested-remote.
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/drbd.h | 8 | ||||
| -rw-r--r-- | include/linux/drbd_genl.h | 1 | ||||
| -rw-r--r-- | include/linux/drbd_limits.h | 1 |
3 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/drbd.h b/include/linux/drbd.h index 1e9f754b66a..157ba3d74dc 100644 --- a/include/linux/drbd.h +++ b/include/linux/drbd.h @@ -102,6 +102,14 @@ enum drbd_on_congestion { OC_DISCONNECT, }; +enum drbd_read_balancing { + RB_PREFER_LOCAL, + RB_PREFER_REMOTE, + RB_ROUND_ROBIN, + RB_LEAST_PENDING, + RB_CONGESTED_REMOTE, +}; + /* KEEP the order, do not delete or insert. Only append. */ enum drbd_ret_code { ERR_CODE_BASE = 100, diff --git a/include/linux/drbd_genl.h b/include/linux/drbd_genl.h index 2e6cefefe5e..826008f297f 100644 --- a/include/linux/drbd_genl.h +++ b/include/linux/drbd_genl.h @@ -129,6 +129,7 @@ GENL_struct(DRBD_NLA_DISK_CONF, 3, disk_conf, __flg_field_def(18, DRBD_GENLA_F_MANDATORY, disk_drain, DRBD_DISK_DRAIN_DEF) __flg_field_def(19, DRBD_GENLA_F_MANDATORY, md_flushes, DRBD_MD_FLUSHES_DEF) __u32_field_def(20, DRBD_GENLA_F_MANDATORY, disk_timeout, DRBD_DISK_TIMEOUT_DEF) + __u32_field_def(21, 0 /* OPTIONAL */, read_balancing, DRBD_READ_BALANCING_DEF) ) GENL_struct(DRBD_NLA_RESOURCE_OPTS, 4, res_opts, diff --git a/include/linux/drbd_limits.h b/include/linux/drbd_limits.h index 6d0a24331ed..17ef66a5c11 100644 --- a/include/linux/drbd_limits.h +++ b/include/linux/drbd_limits.h @@ -161,6 +161,7 @@ #define DRBD_RR_CONFLICT_DEF ASB_DISCONNECT #define DRBD_ON_NO_DATA_DEF OND_IO_ERROR #define DRBD_ON_CONGESTION_DEF OC_BLOCK +#define DRBD_READ_BALANCING_DEF RB_PREFER_LOCAL #define DRBD_MAX_BIO_BVECS_MIN 0 #define DRBD_MAX_BIO_BVECS_MAX 128 |