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#include <stdio.h>
#include <string.h>
#include <stddef.h>
#include <dlfcn.h>
#include <sys/stat.h>
#include "debug.h"
#include "prio.h"
#include "config.h"
static LIST_HEAD(prioritizers);
int init_prio (void)
{
if (!add_prio(DEFAULT_PRIO))
return 1;
return 0;
}
static struct prio * alloc_prio (void)
{
struct prio *p;
p = MALLOC(sizeof(struct prio));
if (p) {
INIT_LIST_HEAD(&p->node);
p->refcount = 1;
}
return p;
}
void free_prio (struct prio * p)
{
if (!p)
return;
p->refcount--;
if (p->refcount) {
condlog(3, "%s prioritizer refcount %d",
p->name, p->refcount);
return;
}
condlog(3, "unloading %s prioritizer", p->name);
list_del(&p->node);
if (p->handle) {
if (dlclose(p->handle) != 0) {
condlog(0, "Cannot unload prioritizer %s: %s",
p->name, dlerror());
}
}
FREE(p);
}
void cleanup_prio(void)
{
struct prio * prio_loop;
struct prio * prio_temp;
list_for_each_entry_safe(prio_loop, prio_temp, &prioritizers, node) {
free_prio(prio_loop);
}
}
struct prio * prio_lookup (char * name)
{
struct prio * p;
if (!name || !strlen(name))
return NULL;
list_for_each_entry(p, &prioritizers, node) {
if (!strncmp(name, p->name, PRIO_NAME_LEN))
return p;
}
return add_prio(name);
}
int prio_set_args (struct prio * p, char * args)
{
return snprintf(p->args, PRIO_ARGS_LEN, "%s", args);
}
struct prio * add_prio (char * name)
{
char libname[LIB_PRIO_NAMELEN];
struct stat stbuf;
struct prio * p;
char *errstr;
p = alloc_prio();
if (!p)
return NULL;
snprintf(p->name, PRIO_NAME_LEN, "%s", name);
snprintf(libname, LIB_PRIO_NAMELEN, "%s/libprio%s.so",
conf->multipath_dir, name);
if (stat(libname,&stbuf) < 0) {
condlog(0,"Prioritizer '%s' not found in %s",
name, conf->multipath_dir);
goto out;
}
condlog(3, "loading %s prioritizer", libname);
p->handle = dlopen(libname, RTLD_NOW);
if (!p->handle) {
if ((errstr = dlerror()) != NULL)
condlog(0, "A dynamic linking error occurred: (%s)",
errstr);
goto out;
}
p->getprio = (int (*)(struct path *, char *)) dlsym(p->handle, "getprio");
errstr = dlerror();
if (errstr != NULL)
condlog(0, "A dynamic linking error occurred: (%s)", errstr);
if (!p->getprio)
goto out;
list_add(&p->node, &prioritizers);
return p;
out:
free_prio(p);
return NULL;
}
int prio_getprio (struct prio * p, struct path * pp)
{
return p->getprio(pp, p->args);
}
int prio_selected (struct prio * p)
{
if (!p || !p->getprio)
return 0;
return (p->getprio) ? 1 : 0;
}
char * prio_name (struct prio * p)
{
return p->name;
}
char * prio_args (struct prio * p)
{
return p->args;
}
void prio_get (struct prio * dst, char * name, char * args)
{
struct prio * src = prio_lookup(name);
if (!src) {
dst->getprio = NULL;
return;
}
strncpy(dst->name, src->name, PRIO_NAME_LEN);
if (args)
strncpy(dst->args, args, PRIO_ARGS_LEN);
dst->getprio = src->getprio;
dst->handle = NULL;
src->refcount++;
}
void prio_put (struct prio * dst)
{
struct prio * src;
if (!dst)
return;
src = prio_lookup(dst->name);
memset(dst, 0x0, sizeof(struct prio));
free_prio(src);
}
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