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scst_copy_mgr: Introduce scst_cm_get_free_lun()

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Introduce the helper function scst_cm_get_free_lun(), which purpose is
to return the next free copy manager LUN.

This patch doesn't change any functionality.
This commit is contained in:
Gleb Chesnokov
2022-11-14 15:33:38 +03:00
parent 049dc57b10
commit f93b3ae720
1 changed files with 19 additions and 14 deletions
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33
scst/src/scst_copy_mgr.c
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@@ -2541,11 +2541,28 @@ out:
return res;
}
static uint64_t scst_cm_get_free_lun(void)
{
uint64_t lun;
while (1) {
lun = scst_cm_next_lun++;
if (lun == SCST_MAX_LUN) {
scst_cm_next_lun = 0;
continue;
}
if (scst_cm_is_lun_free(lun))
break;
}
return lun;
}
static int scst_cm_dev_register(struct scst_device *dev, uint64_t lun)
{
int res;
struct scst_acg_dev *acg_dev;
bool add_lun;
TRACE_ENTRY();
@@ -2561,20 +2578,8 @@ static int scst_cm_dev_register(struct scst_device *dev, uint64_t lun)
goto out;
}
add_lun = true;
while (1) {
lun = scst_cm_next_lun++;
if (lun == SCST_MAX_LUN) {
scst_cm_next_lun = 0;
continue;
}
if (scst_cm_is_lun_free(lun))
break;
}
} else
add_lun = false;
lun = scst_cm_get_free_lun();
if (add_lun) {
res = scst_acg_add_lun(scst_cm_tgt->default_acg,
scst_cm_tgt->tgt_luns_kobj, dev, lun, SCST_ADD_LUN_CM,
&acg_dev);