static void _unlock_mem(struct cmd_context *cmd)
{
size_t unlock_mstats;
log_very_verbose("Unlocking memory");
if (!_memlock_maps(cmd, LVM_MUNLOCK, &unlock_mstats))
stack;
if (!_use_mlockall) {
_restore_mmap();
if (close(_maps_fd))
log_sys_error("close", _procselfmaps);
dm_free(_maps_buffer);
_maps_buffer = NULL;
if (_mstats < unlock_mstats) {
if ((_mstats + lvm_getpagesize()) < unlock_mstats)
log_error(INTERNAL_ERROR
"Reserved memory (%ld) not enough: used %ld. Increase activation/reserved_memory?",
(long)_mstats, (long)unlock_mstats);
else
/* FIXME Believed due to incorrect use of yes_no_prompt while locks held */
log_debug_mem("Suppressed internal error: Maps lock %ld < unlock %ld, a one-page difference.",
(long)_mstats, (long)unlock_mstats);
}
}
if (setpriority(PRIO_PROCESS, 0, _priority))
log_error("setpriority %u failed: %s", _priority,
strerror(errno));
_release_memory();
}
/* Stop memory getting swapped out */
static void _lock_mem(struct cmd_context *cmd)
{
_allocate_memory();
(void)strerror(0); /* Force libc.mo load */
(void)dm_udev_get_sync_support(); /* udev is initialized */
log_very_verbose("Locking memory");
/*
* For daemon we need to use mlockall()
* so even future adition of thread which may not even use lvm lib
* will not block memory locked thread
* Note: assuming _memlock_count_daemon is updated before _memlock_count
*/
_use_mlockall = _memlock_count_daemon ? 1 :
find_config_tree_bool(cmd, activation_use_mlockall_CFG, NULL);
if (!_use_mlockall) {
if (!*_procselfmaps &&
dm_snprintf(_procselfmaps, sizeof(_procselfmaps),
"%s" SELF_MAPS, cmd->proc_dir) < 0) {
log_error("proc_dir too long");
return;
}
if (!(_maps_fd = open(_procselfmaps, O_RDONLY))) {
log_sys_error("open", _procselfmaps);
return;
}
if (!_disable_mmap())
stack;
}
if (!_memlock_maps(cmd, LVM_MLOCK, &_mstats))
stack;
errno = 0;
if (((_priority = getpriority(PRIO_PROCESS, 0)) == -1) && errno)
log_sys_error("getpriority", "");
else
if (setpriority(PRIO_PROCESS, 0, _default_priority))
log_error("setpriority %d failed: %s",
_default_priority, strerror(errno));
}
static void _unlock_mem(struct cmd_context *cmd)
{
size_t unlock_mstats;
log_very_verbose("Unlocking memory");
if (!_memlock_maps(cmd, LVM_MUNLOCK, &unlock_mstats))
stack;
if (!_use_mlockall) {
if (close(_maps_fd))
log_sys_error("close", _procselfmaps);
dm_free(_maps_buffer);
_maps_buffer = NULL;
if (_mstats < unlock_mstats)
log_error(INTERNAL_ERROR "Maps lock %ld < unlock %ld",
(long)_mstats, (long)unlock_mstats);
}
if (setpriority(PRIO_PROCESS, 0, _priority))
log_error("setpriority %u failed: %s", _priority,
strerror(errno));
_release_memory();
}
