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dmeventd: thin plugin umount over 95%

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Run umount code only when either thin data or metadata are
above 95% - so if there are resize failures with 60%.
system fill keep running.

Also umount will only be tried with lvm2 LVs.
Foreign users are ATM unsuppored.
This commit is contained in:
Zdenek Kabelac 2016-06-29 15:56:29 +02:00
parent 103c188681
commit 2f638e07e8
2 changed files with 89 additions and 11 deletions
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1
WHATS_NEW_DM
View File

@ -1,5 +1,6 @@
Version 1.02.129 -
=================================
Thin dmeventd plugin umounts lvm2 volume only when pool is 95% or more.
Version 1.02.128 - 25th June 2016
=================================

95
daemons/dmeventd/plugins/thin/dmeventd_thin.c
View File

@ -1,5 +1,5 @@
/*
* Copyright (C) 2011-2015 Red Hat, Inc. All rights reserved.
* Copyright (C) 2011-2016 Red Hat, Inc. All rights reserved.
*
* This file is part of LVM2.
*
@ -30,6 +30,9 @@
/* First warning when thin data or metadata is 80% full. */
#define WARNING_THRESH (DM_PERCENT_1 * 80)
/* Umount thin LVs when thin data or metadata LV is >=
* and lvextend --use-policies has failed. */
#define UMOUNT_THRESH (DM_PERCENT_1 * 95)
/* Run a check every 5%. */
#define CHECK_STEP (DM_PERCENT_1 * 5)
/* Do not bother checking thin data or metadata is less than 50% full. */
@ -53,6 +56,53 @@ struct dso_state {
DM_EVENT_LOG_FN("thin")
#define UUID_PREFIX "LVM-"
/* Figure out device UUID has LVM- prefix and is OPEN */
static int _has_unmountable_prefix(int major, int minor)
{
struct dm_task *dmt;
struct dm_info info;
const char *uuid;
int r = 0;
if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
return_0;
if (!dm_task_set_major_minor(dmt, major, minor, 1))
goto_out;
if (!dm_task_no_flush(dmt))
stack;
if (!dm_task_run(dmt))
goto out;
if (!dm_task_get_info(dmt, &info))
goto out;
if (!info.exists || !info.open_count)
goto out; /* Not open -> not mounted */
if (!(uuid = dm_task_get_uuid(dmt)))
goto out;
/* Check it's public mountable LV
* has prefix LVM- and UUID size is 68 chars */
if (memcmp(uuid, UUID_PREFIX, sizeof(UUID_PREFIX) - 1) ||
strlen(uuid) != 68)
goto out;
#if THIN_DEBUG
log_debug("Found LV (%u:%u) %s.", major, minor, uuid);
#endif
r = 1;
out:
dm_task_destroy(dmt);
return r;
}
/* Get dependencies for device, and try to find matching device */
static int _has_deps(const char *name, int tp_major, int tp_minor, int *dev_minor)
{
@ -90,6 +140,9 @@ static int _has_deps(const char *name, int tp_major, int tp_minor, int *dev_mino
*dev_minor = info.minor;
if (!_has_unmountable_prefix(major, info.minor))
goto out;
#if THIN_DEBUG
{
char dev_name[PATH_MAX];
@ -206,7 +259,7 @@ static int _umount_device(char *buffer, unsigned major, unsigned minor,
}
/*
* Find all thin pool users and try to umount them.
* Find all thin pool LV users and try to umount them.
* TODO: work with read-only thin pool support
*/
static void _umount(struct dm_task *dmt)
@ -240,7 +293,7 @@ out:
dm_bitset_destroy(data.minors);
}
static void _use_policy(struct dm_task *dmt, struct dso_state *state)
static int _use_policy(struct dm_task *dmt, struct dso_state *state)
{
#if THIN_DEBUG
log_info("dmeventd executes: %s.", state->cmd_str);
@ -248,10 +301,12 @@ static void _use_policy(struct dm_task *dmt, struct dso_state *state)
if (!dmeventd_lvm2_run_with_lock(state->cmd_str)) {
log_error("Failed to extend thin pool %s.",
dm_task_get_name(dmt));
_umount(dmt);
state->fails++;
} else
return 0;
}
state->fails = 0;
return 1;
}
void process_event(struct dm_task *dmt,
@ -267,6 +322,13 @@ void process_event(struct dm_task *dmt,
char *target_type = NULL;
char *params;
int needs_policy = 0;
int needs_umount = 0;
#if THIN_DEBUG
log_debug("Watch for tp-data:%.2f%% tp-metadata:%.2f%%.",
dm_percent_to_float(state->data_percent_check),
dm_percent_to_float(state->metadata_percent_check));
#endif
#if 0
/* No longer monitoring, waiting for remove */
@ -275,8 +337,10 @@ void process_event(struct dm_task *dmt,
#endif
if (event & DM_EVENT_DEVICE_ERROR) {
/* Error -> no need to check and do instant resize */
_use_policy(dmt, state);
if (_use_policy(dmt, state))
goto out;
stack;
}
dm_get_next_target(dmt, next, &start, &length, &target_type, &params);
@ -288,7 +352,7 @@ void process_event(struct dm_task *dmt,
if (!dm_get_status_thin_pool(state->mem, params, &tps)) {
log_error("Failed to parse status.");
_umount(dmt);
needs_umount = 1;
goto out;
}
@ -323,6 +387,9 @@ void process_event(struct dm_task *dmt,
log_warn("WARNING: Thin pool %s metadata is now %.2f%% full.",
device, dm_percent_to_float(percent));
needs_policy = 1;
if (percent >= UMOUNT_THRESH)
needs_umount = 1;
}
percent = dm_make_percent(tps->used_data_blocks, tps->total_data_blocks);
@ -337,11 +404,21 @@ void process_event(struct dm_task *dmt,
log_warn("WARNING: Thin pool %s data is now %.2f%% full.",
device, dm_percent_to_float(percent));
needs_policy = 1;
if (percent >= UMOUNT_THRESH)
needs_umount = 1;
}
if (needs_policy)
_use_policy(dmt, state);
if (needs_policy &&
_use_policy(dmt, state))
needs_umount = 0; /* No umount when command was successful */
out:
if (needs_umount) {
_umount(dmt);
/* Until something changes, do not retry any more actions */
state->data_percent_check = state->metadata_percent_check = (DM_PERCENT_1 * 101);
}
if (tps)
dm_pool_free(state->mem, tps);