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drbd: implement csums-after-crash-only 

Checksum based resync trades CPU cycles for network bandwidth,
in situations where we expect much of the to-be-resynced blocks
to be actually identical on both sides already.

In a "network hickup" scenario, it won't help:
all to-be-resynced blocks will typically be different.

The use case is for the resync of *potentially* different blocks
after crash recovery -- the crash recovery had marked larger areas
(those covered by the activity log) as need-to-be-resynced,
just in case. Most of those blocks will be identical.

This option makes it possible to configure checksum based resync,
but only actually use it for the first resync after primary crash.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
This commit is contained in:
Lars Ellenberg 2014-03-18 12:30:09 +01:00 committed by Philipp Reisner
parent 6a8d68b187
commit aaaba34576
5 changed files with 28 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/block/drbd/drbd_int.h
View File

@ -738,6 +738,8 @@ struct drbd_device {
struct rb_root read_requests;
struct rb_root write_requests;
/* use checksums for *this* resync */
bool use_csums;
/* blocks to resync in this run [unit BM_BLOCK_SIZE] */
unsigned long rs_total;
/* number of resync blocks that failed in this run */

2
drivers/block/drbd/drbd_receiver.c
View File

@ -2555,6 +2555,8 @@ static int receive_DataRequest(struct drbd_connection *connection, struct packet
peer_req->w.cb = w_e_end_csum_rs_req;
/* used in the sector offset progress display */
device->bm_resync_fo = BM_SECT_TO_BIT(sector);
/* remember to report stats in drbd_resync_finished */
device->use_csums = true;
} else if (pi->cmd == P_OV_REPLY) {
/* track progress, we may need to throttle */
atomic_add(size >> 9, &device->rs_sect_in);

24
drivers/block/drbd/drbd_worker.c
View File

@ -698,8 +698,8 @@ next_sector:
/* adjust very last sectors, in case we are oddly sized */
if (sector + (size>>9) > capacity)
size = (capacity-sector)<<9;
if (connection->agreed_pro_version >= 89 &&
connection->csums_tfm) {
if (device->use_csums) {
switch (read_for_csum(peer_device, sector, size)) {
case -EIO: /* Disk failure */
put_ldev(device);
@ -913,7 +913,7 @@ int drbd_resync_finished(struct drbd_device *device)
if (os.conn == C_SYNC_TARGET || os.conn == C_PAUSED_SYNC_T)
khelper_cmd = "after-resync-target";
if (first_peer_device(device)->connection->csums_tfm && device->rs_total) {
if (device->use_csums && device->rs_total) {
const unsigned long s = device->rs_same_csum;
const unsigned long t = device->rs_total;
const int ratio =
@ -1622,6 +1622,18 @@ static void do_start_resync(struct drbd_device *device)
clear_bit(AHEAD_TO_SYNC_SOURCE, &device->flags);
}
static bool use_checksum_based_resync(struct drbd_connection *connection, struct drbd_device *device)
{
bool csums_after_crash_only;
rcu_read_lock();
csums_after_crash_only = rcu_dereference(connection->net_conf)->csums_after_crash_only;
rcu_read_unlock();
return connection->agreed_pro_version >= 89 && /* supported? */
connection->csums_tfm && /* configured? */
(csums_after_crash_only == 0 /* use for each resync? */
|| test_bit(CRASHED_PRIMARY, &device->flags)); /* or only after Primary crash? */
}
/**
* drbd_start_resync() - Start the resync process
* @device: DRBD device.
@ -1756,8 +1768,12 @@ void drbd_start_resync(struct drbd_device *device, enum drbd_conns side)
drbd_conn_str(ns.conn),
(unsigned long) device->rs_total << (BM_BLOCK_SHIFT-10),
(unsigned long) device->rs_total);
if (side == C_SYNC_TARGET)
if (side == C_SYNC_TARGET) {
device->bm_resync_fo = 0;
device->use_csums = use_checksum_based_resync(connection, device);
} else {
device->use_csums = 0;
}
/* Since protocol 96, we must serialize drbd_gen_and_send_sync_uuid
* with w_send_oos, or the sync target will get confused as to

3
include/linux/drbd_genl.h
View File

@ -171,6 +171,9 @@ GENL_struct(DRBD_NLA_NET_CONF, 5, net_conf,
__flg_field(28, DRBD_GENLA_F_MANDATORY | DRBD_F_INVARIANT, tentative)
__flg_field_def(29, DRBD_GENLA_F_MANDATORY, use_rle, DRBD_USE_RLE_DEF)
/* 9: __u32_field_def(30, DRBD_GENLA_F_MANDATORY, fencing_policy, DRBD_FENCING_DEF) */
/* 9: __str_field_def(31, DRBD_GENLA_F_MANDATORY, name, SHARED_SECRET_MAX) */
/* 9: __u32_field(32, DRBD_F_REQUIRED | DRBD_F_INVARIANT, peer_node_id) */
__flg_field_def(33, 0 /* OPTIONAL */, csums_after_crash_only, DRBD_CSUMS_AFTER_CRASH_ONLY_DEF)
)
GENL_struct(DRBD_NLA_SET_ROLE_PARMS, 6, set_role_parms,

1
include/linux/drbd_limits.h
View File

@ -214,6 +214,7 @@
#define DRBD_ALLOW_TWO_PRIMARIES_DEF 0
#define DRBD_ALWAYS_ASBP_DEF 0
#define DRBD_USE_RLE_DEF 1
#define DRBD_CSUMS_AFTER_CRASH_ONLY_DEF 0
#define DRBD_AL_STRIPES_MIN 1
#define DRBD_AL_STRIPES_MAX 1024