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lvmlockd: disable lvb for sanlock

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The lvb is used to hold lock versions, but lock verions are
no longer used (since the removal of lvmetad), so the lvb
is not actually useful.  Disable their use for sanlock to
avoid the extra i/o required to maintain the lvb.
This commit is contained in:
David Teigland 2024-06-14 10:59:35 -05:00
parent 58e75f6178
commit 55687b6656
4 changed files with 24 additions and 5 deletions
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2
daemons/lvmlockd/lvmlockd-client.h
View File

@ -16,6 +16,8 @@
#define LVMLOCKD_SOCKET DEFAULT_RUN_DIR "/lvmlockd.socket"
#define LVMLOCKD_ADOPT_FILE DEFAULT_RUN_DIR "/lvmlockd.adopt"
#define LVMLOCKD_USE_SANLOCK_LVB 0
/* Wrappers to open/close connection */
static inline __attribute__((always_inline))

2
daemons/lvmlockd/lvmlockd-core.c
View File

@ -1320,7 +1320,9 @@ static int res_lock(struct lockspace *ls, struct resource *r, struct action *act
* once someone uses the lock and writes a new lvb value.
* Do nothing.
*/
/*
log_debug("S %s R %s res_lock version_zero_valid still zero", ls->name, r->name);
*/
} else if (r->version_zero_valid && vb.r_version) {
/*

11
daemons/lvmlockd/lvmlockd-sanlock.c
View File

@ -1610,12 +1610,17 @@ static int lm_add_resource_sanlock(struct lockspace *ls, struct resource *r)
/* LD_RT_LV offset is set in each lm_lock call from lv_args. */
/*
* Disable sanlock lvb since lock versions are not currently used for
* anything, and it's nice to avoid the extra i/o used for lvb's.
*/
#if LVMLOCKD_USE_SANLOCK_LVB
if (r->type == LD_RT_GL || r->type == LD_RT_VG) {
rds->vb = zalloc(sizeof(struct val_blk));
if (!rds->vb)
return -ENOMEM;
}
#endif
return 0;
}
@ -1624,9 +1629,9 @@ int lm_rem_resource_sanlock(struct lockspace *ls, struct resource *r)
struct rd_sanlock *rds = (struct rd_sanlock *)r->lm_data;
/* FIXME: assert r->mode == UN or unlock if it's not? */
#ifdef LVMLOCKD_USE_SANLOCK_LVB
free(rds->vb);
#endif
memset(rds, 0, sizeof(struct rd_sanlock));
r->lm_init = 0;
return 0;

14
lib/locking/lvmlockd.c
View File

@ -2301,12 +2301,22 @@ int lockd_vg_update(struct volume_group *vg)
int result;
int ret;
if (!vg_is_shared(vg))
return 1;
if (!_use_lvmlockd)
return 0;
if (!_lvmlockd_connected)
return 0;
if (!vg_is_shared(vg))
return 1;
#if !LVMLOCKD_USE_SANLOCK_LVB
/*
* lvb (for lock version) is disabled for sanlock since
* lock versions are not used any more, and it's more
* costly for sanlock to implement (extra i/o.)
*/
if (!strcmp(vg->lock_type, "sanlock"))
return 1;
#endif
reply = _lockd_send("vg_update",
"pid = " FMTd64, (int64_t) getpid(),