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deactivation: reduce ioctl count

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When LV is deactivativate, we check for presence, and later
for some LV types also for being in use.

We can however do this check in 1 step for them a remove extra ioctl.

Add return value '2' to lv_check_not_in_use() to recognize LV is not
present.

Existing users were just testing for 0, so no change for them.
This commit is contained in:
Zdenek Kabelac 2021-03-07 01:54:50 +01:00
parent 936c7b5104
commit dceef4709d
1 changed files with 38 additions and 34 deletions
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72
lib/activate/activate.c
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@ -828,13 +828,14 @@ int lv_info_with_seg_status(struct cmd_context *cmd,
#define OPEN_COUNT_CHECK_USLEEP_DELAY 200000
/* Only report error if error_if_used is set */
/* Returns 0 if in use, 1 if it is unused, 2 when it is not present in table */
int lv_check_not_in_use(const struct logical_volume *lv, int error_if_used)
{
struct lvinfo info;
unsigned int open_count_check_retries;
if (!lv_info(lv->vg->cmd, lv, 0, &info, 1, 0) || !info.exists || !info.open_count)
return 1;
return !info.exists ? 2 : 1;
/* If sysfs is not used, use open_count information only. */
if (dm_sysfs_dir()) {
@ -2408,44 +2409,47 @@ int lv_deactivate(struct cmd_context *cmd, const char *lvid_s, const struct logi
log_debug_activation("Deactivating %s.", display_lvname(lv));
if (!lv_info(cmd, lv, 0, &info, 0, 0))
goto_out;
if (!info.exists) {
r = 1;
/* Check attached snapshot segments are also inactive */
dm_list_iterate(snh, &lv->snapshot_segs) {
if (!lv_info(cmd, dm_list_struct_base(snh, struct lv_segment, origin_list)->cow,
0, &info, 0, 0))
goto_out;
if (info.exists) {
r = 0; /* Snapshot left in table? */
break;
}
}
if (lv_is_vdo_pool(lv)) {
/* If someone has remove 'linear' mapping over VDO device
* we may still be able to deactivate the rest of the tree
* i.e. in test-suite we simulate this via 'dmsetup remove' */
if (!lv_info(cmd, lv, 1, &info, 1, 0))
goto_out;
if (info.exists && !info.open_count)
r = 0; /* Unused VDO device left in table? */
}
if (r)
goto out;
}
if (lv_is_visible(lv) || lv_is_virtual_origin(lv) ||
lv_is_merging_thin_snapshot(lv)) {
if (!lv_check_not_in_use(lv, 1))
goto_out;
switch (lv_check_not_in_use(lv, 1)) {
case 0: goto_out;
case 2: goto no_exists;
}
if (lv_is_origin(lv) && _lv_has_open_snapshots(lv))
goto_out;
} else {
if (!lv_info(cmd, lv, 0, &info, 0, 0))
goto_out;
if (!info.exists) {
no_exists:
r = 1;
/* Check attached snapshot segments are also inactive */
dm_list_iterate(snh, &lv->snapshot_segs) {
if (!lv_info(cmd, dm_list_struct_base(snh, struct lv_segment, origin_list)->cow,
0, &info, 0, 0))
goto_out;
if (info.exists) {
r = 0; /* Snapshot left in table? */
break;
}
}
if (lv_is_vdo_pool(lv)) {
/* If someone has remove 'linear' mapping over VDO device
* we may still be able to deactivate the rest of the tree
* i.e. in test-suite we simulate this via 'dmsetup remove' */
if (!lv_info(cmd, lv, 1, &info, 1, 0))
goto_out;
if (info.exists && !info.open_count)
r = 0; /* Unused VDO device left in table? */
}
if (r)
goto out;
}
}
if (!monitor_dev_for_events(cmd, lv, &laopts, 0))