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drbd: New configuration parameters for dealing with network congestion 

net {
    on_congestion {block|pull-ahead|disconnect};
    congestion-fill {sectors};
    congestion-extents {al-extents};
}

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
This commit is contained in:
Philipp Reisner 2010-10-27 11:12:07 +02:00
parent 759fbdfba6
commit 422028b1ca
4 changed files with 26 additions and 0 deletions
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7
drivers/block/drbd/drbd_nl.c
View File

@ -1323,6 +1323,8 @@ static int drbd_nl_net_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
new_conf->wire_protocol = DRBD_PROT_C;
new_conf->ping_timeo = DRBD_PING_TIMEO_DEF;
new_conf->rr_conflict = DRBD_RR_CONFLICT_DEF;
new_conf->on_congestion = DRBD_ON_CONGESTION_DEF;
new_conf->cong_extents = DRBD_CONG_EXTENTS_DEF;
if (!net_conf_from_tags(mdev, nlp->tag_list, new_conf)) {
retcode = ERR_MANDATORY_TAG;
@ -1344,6 +1346,11 @@ static int drbd_nl_net_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
}
}
if (new_conf->on_congestion != OC_BLOCK && new_conf->wire_protocol != DRBD_PROT_A) {
retcode = ERR_CONG_NOT_PROTO_A;
goto fail;
}
if (mdev->state.role == R_PRIMARY && new_conf->want_lose) {
retcode = ERR_DISCARD;
goto fail;

7
include/linux/drbd.h
View File

@ -96,6 +96,12 @@ enum drbd_on_no_data {
OND_SUSPEND_IO
};
enum drbd_on_congestion {
OC_BLOCK,
OC_PULL_AHEAD,
OC_DISCONNECT,
};
/* KEEP the order, do not delete or insert. Only append. */
enum drbd_ret_codes {
ERR_CODE_BASE = 100,
@ -146,6 +152,7 @@ enum drbd_ret_codes {
ERR_PERM = 152,
ERR_NEED_APV_93 = 153,
ERR_STONITH_AND_PROT_A = 154,
ERR_CONG_NOT_PROTO_A = 155,
/* insert new ones above this line */
AFTER_LAST_ERR_CODE

9
include/linux/drbd_limits.h
View File

@ -129,6 +129,7 @@
#define DRBD_AFTER_SB_2P_DEF ASB_DISCONNECT
#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_MAX_BIO_BVECS_MIN 0
#define DRBD_MAX_BIO_BVECS_MAX 128
@ -154,5 +155,13 @@
#define DRBD_C_MIN_RATE_MAX (4 << 20)
#define DRBD_C_MIN_RATE_DEF 4096
#define DRBD_CONG_FILL_MIN 0
#define DRBD_CONG_FILL_MAX (10<<21) /* 10GByte in sectors */
#define DRBD_CONG_FILL_DEF 0
#define DRBD_CONG_EXTENTS_MIN DRBD_AL_EXTENTS_MIN
#define DRBD_CONG_EXTENTS_MAX DRBD_AL_EXTENTS_MAX
#define DRBD_CONG_EXTENTS_DEF DRBD_AL_EXTENTS_DEF
#undef RANGE
#endif

3
include/linux/drbd_nl.h
View File

@ -56,6 +56,9 @@ NL_PACKET(net_conf, 5,
NL_INTEGER( 39, T_MAY_IGNORE, rr_conflict)
NL_INTEGER( 40, T_MAY_IGNORE, ping_timeo)
NL_INTEGER( 67, T_MAY_IGNORE, rcvbuf_size)
NL_INTEGER( 81, T_MAY_IGNORE, on_congestion)
NL_INTEGER( 82, T_MAY_IGNORE, cong_fill)
NL_INTEGER( 83, T_MAY_IGNORE, cong_extents)
/* 59 addr_family was available in GIT, never released */
NL_BIT( 60, T_MANDATORY, mind_af)
NL_BIT( 27, T_MAY_IGNORE, want_lose)