static int _no_lock_resource(struct cmd_context *cmd, const char *resource,
uint32_t flags)
{
switch (flags & LCK_SCOPE_MASK) {
case LCK_VG:
break;
case LCK_LV:
switch (flags & LCK_TYPE_MASK) {
case LCK_NULL:
return lv_deactivate(cmd, resource);
case LCK_UNLOCK:
return lv_resume_if_active(cmd, resource);
case LCK_READ:
return lv_activate_with_filter(cmd, resource, 0);
case LCK_WRITE:
return lv_suspend_if_active(cmd, resource);
case LCK_EXCL:
return lv_activate_with_filter(cmd, resource, 1);
default:
break;
}
break;
default:
log_error("Unrecognised lock scope: %d",
flags & LCK_SCOPE_MASK);
return 0;
}
return 1;
}
static int _no_lock_resource(struct cmd_context *cmd, const char *resource,
uint32_t flags, struct logical_volume *lv)
{
switch (flags & LCK_SCOPE_MASK) {
case LCK_VG:
if (!strcmp(resource, VG_SYNC_NAMES))
fs_unlock();
break;
case LCK_LV:
switch (flags & LCK_TYPE_MASK) {
case LCK_NULL:
return lv_deactivate(cmd, resource, lv_ondisk(lv));
case LCK_UNLOCK:
return lv_resume_if_active(cmd, resource, (flags & LCK_ORIGIN_ONLY) ? 1: 0, 0, (flags & LCK_REVERT) ? 1 : 0, lv_ondisk(lv));
case LCK_READ:
return lv_activate_with_filter(cmd, resource, 0, lv_ondisk(lv));
case LCK_WRITE:
return lv_suspend_if_active(cmd, resource, (flags & LCK_ORIGIN_ONLY) ? 1 : 0, 0, lv_ondisk(lv), lv);
case LCK_EXCL:
return lv_activate_with_filter(cmd, resource, 1, lv_ondisk(lv));
default:
break;
}
break;
default:
log_error("Unrecognised lock scope: %d",
flags & LCK_SCOPE_MASK);
return 0;
}
return 1;
}
static int _file_lock_resource(struct cmd_context *cmd, const char *resource,
uint32_t flags, struct logical_volume *lv)
{
char lockfile[PATH_MAX];
unsigned origin_only = (flags & LCK_ORIGIN_ONLY) ? 1 : 0;
unsigned revert = (flags & LCK_REVERT) ? 1 : 0;
switch (flags & LCK_SCOPE_MASK) {
case LCK_ACTIVATION:
if (dm_snprintf(lockfile, sizeof(lockfile),
"%s/A_%s", _lock_dir, resource + 1) < 0) {
log_error("Too long locking filename %s/A_%s.", _lock_dir, resource + 1);
return 0;
}
if (!lock_file(lockfile, flags))
return_0;
break;
case LCK_VG:
/* Skip cache refresh for VG_GLOBAL - the caller handles it */
if (strcmp(resource, VG_GLOBAL))
lvmcache_drop_metadata(resource, 0);
if (!strcmp(resource, VG_SYNC_NAMES))
fs_unlock();
/* LCK_CACHE does not require a real lock */
if (flags & LCK_CACHE)
break;
if (is_orphan_vg(resource) || is_global_vg(resource)) {
if (dm_snprintf(lockfile, sizeof(lockfile),
"%s/P_%s", _lock_dir, resource + 1) < 0) {
log_error("Too long locking filename %s/P_%s.",
_lock_dir, resource + 1);
return 0;
}
} else
if (dm_snprintf(lockfile, sizeof(lockfile),
"%s/V_%s", _lock_dir, resource) < 0) {
log_error("Too long locking filename %s/V_%s.",
_lock_dir, resource);
return 0;
}
if (!lock_file(lockfile, flags))
return_0;
break;
case LCK_LV:
switch (flags & LCK_TYPE_MASK) {
case LCK_UNLOCK:
log_very_verbose("Unlocking LV %s%s%s", resource, origin_only ? " without snapshots" : "", revert ? " (reverting)" : "");
if (!lv_resume_if_active(cmd, resource, origin_only, 0, revert, lv_ondisk(lv)))
return 0;
break;
case LCK_NULL:
log_very_verbose("Locking LV %s (NL)", resource);
if (!lv_deactivate(cmd, resource, lv_ondisk(lv)))
return 0;
break;
case LCK_READ:
log_very_verbose("Locking LV %s (R)", resource);
if (!lv_activate_with_filter(cmd, resource, 0, lv->status & LV_NOSCAN ? 1 : 0,
lv->status & LV_TEMPORARY ? 1 : 0, lv_ondisk(lv)))
return 0;
break;
case LCK_PREAD:
log_very_verbose("Locking LV %s (PR) - ignored", resource);
break;
case LCK_WRITE:
log_very_verbose("Locking LV %s (W)%s", resource, origin_only ? " without snapshots" : "");
if (!lv_suspend_if_active(cmd, resource, origin_only, 0, lv_ondisk(lv), lv))
return 0;
break;
case LCK_EXCL:
log_very_verbose("Locking LV %s (EX)", resource);
if (!lv_activate_with_filter(cmd, resource, 1, lv->status & LV_NOSCAN ? 1 : 0,
lv->status & LV_TEMPORARY ? 1 : 0, lv_ondisk(lv)))
return 0;
break;
default:
break;
}
break;
default:
log_error("Unrecognised lock scope: %d",
flags & LCK_SCOPE_MASK);
return 0;
}
return 1;
}
