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Index: sys/kern/imgact_binmisc.c
===================================================================
--- sys/kern/imgact_binmisc.c
+++ sys/kern/imgact_binmisc.c
@@ -98,68 +98,11 @@
SLIST_HEAD_INITIALIZER(interpreter_list);
static int interp_list_entry_count = 0;
-static int interp_list_rcount = 0;
-static struct mtx interp_list_mtx;
-int imgact_binmisc_exec(struct image_params *imgp);
-
-static inline void
-interp_list_rlock()
-{
-
- /* Don't use atomic_add() here. We must block if the mutex is held. */
- mtx_lock(&interp_list_mtx);
- interp_list_rcount++;
- mtx_unlock(&interp_list_mtx);
-}
-
-static inline void
-interp_list_runlock()
-{
-
- /* Decrement the reader count and wake up one writer, if any. */
- atomic_subtract_int(&interp_list_rcount, 1);
- if (interp_list_rcount == 0)
- wakeup_one(&interp_list_rcount);
-}
+static struct sx interp_list_sx;
-static inline void
-interp_list_wlock()
-{
-
- /* Wait until there are no readers. */
- mtx_lock(&interp_list_mtx);
- while (interp_list_rcount)
- mtx_sleep(&interp_list_rcount, &interp_list_mtx, 0, "IABM", 0);
-}
-
-static inline void
-interp_list_wunlock()
-{
-
- mtx_unlock(&interp_list_mtx);
-}
-
-#define interp_list_assert_rlocked() \
- KASSERT(interp_list_rcount > 0, ("%s: interp_list lock not held " \
- "for read", __func__))
-
-#define interp_list_assert_wlocked() mtx_assert(&interp_list_mtx, MA_OWNED)
-
-#ifdef INVARIANTS
-#define interp_list_assert_locked() do { \
- if (interp_list_rcount == 0) \
- mtx_assert(&interp_list_mtx, MA_OWNED); \
- else \
- KASSERT(interp_list_rcount > 0, \
- ("%s: interp_list lock not held", __func__)); \
-} while(0)
-
-#else /* ! INVARIANTS */
+int imgact_binmisc_exec(struct image_params *imgp);
-#define interp_list_assert_locked() do { \
-} while(0)
-#endif /* ! INVARIANTS */
/*
* Populate the entry with the information about the interpreter.
@@ -261,7 +204,7 @@
{
imgact_binmisc_entry_t *ibe;
- interp_list_assert_locked();
+ sx_assert(&interp_list_sx, SA_LOCKED);
SLIST_FOREACH(ibe, &interpreter_list, link) {
if (strncmp(name, ibe->ibe_name, IBE_NAME_MAX) == 0)
@@ -323,16 +266,16 @@
if (!ibe)
return (ENOMEM);
- interp_list_wlock();
+ sx_xlock(&interp_list_sx);
if (imgact_binmisc_find_entry(xbe->xbe_name) != NULL) {
- interp_list_wunlock();
+ sx_xunlock(&interp_list_sx);
imgact_binmisc_destroy_entry(ibe);
return (EEXIST);
}
SLIST_INSERT_HEAD(&interpreter_list, ibe, link);
interp_list_entry_count++;
- interp_list_wunlock();
+ sx_xunlock(&interp_list_sx);
return (0);
}
@@ -346,14 +289,14 @@
{
imgact_binmisc_entry_t *ibe;
- interp_list_wlock();
+ sx_xlock(&interp_list_sx);
if ((ibe = imgact_binmisc_find_entry(name)) == NULL) {
- interp_list_wunlock();
+ sx_xunlock(&interp_list_sx);
return (ENOENT);
}
SLIST_REMOVE(&interpreter_list, ibe, imgact_binmisc_entry, link);
interp_list_entry_count--;
- interp_list_wunlock();
+ sx_xunlock(&interp_list_sx);
imgact_binmisc_destroy_entry(ibe);
@@ -369,14 +312,14 @@
{
imgact_binmisc_entry_t *ibe;
- interp_list_rlock();
+ sx_slock(&interp_list_sx);
if ((ibe = imgact_binmisc_find_entry(name)) == NULL) {
- interp_list_runlock();
+ sx_sunlock(&interp_list_sx);
return (ENOENT);
}
atomic_clear_32(&ibe->ibe_flags, IBF_ENABLED);
- interp_list_runlock();
+ sx_sunlock(&interp_list_sx);
return (0);
}
@@ -390,14 +333,14 @@
{
imgact_binmisc_entry_t *ibe;
- interp_list_rlock();
+ sx_slock(&interp_list_sx);
if ((ibe = imgact_binmisc_find_entry(name)) == NULL) {
- interp_list_runlock();
+ sx_sunlock(&interp_list_sx);
return (ENOENT);
}
atomic_set_32(&ibe->ibe_flags, IBF_ENABLED);
- interp_list_runlock();
+ sx_sunlock(&interp_list_sx);
return (0);
}
@@ -408,7 +351,7 @@
{
uint32_t i;
- interp_list_assert_rlocked();
+ sx_assert(&interp_list_sx, SA_LOCKED);
memset(xbe, 0, sizeof(*xbe));
strlcpy(xbe->xbe_name, ibe->ibe_name, IBE_NAME_MAX);
@@ -440,14 +383,14 @@
imgact_binmisc_entry_t *ibe;
int error = 0;
- interp_list_rlock();
+ sx_slock(&interp_list_sx);
if ((ibe = imgact_binmisc_find_entry(name)) == NULL) {
- interp_list_runlock();
+ sx_sunlock(&interp_list_sx);
return (ENOENT);
}
error = imgact_binmisc_populate_xbe(xbe, ibe);
- interp_list_runlock();
+ sx_sunlock(&interp_list_sx);
return (error);
}
@@ -462,12 +405,12 @@
imgact_binmisc_entry_t *ibe;
int error = 0, count;
- interp_list_rlock();
+ sx_slock(&interp_list_sx);
count = interp_list_entry_count;
/* Don't block in malloc() while holding lock. */
xbe = malloc(sizeof(*xbe) * count, M_BINMISC, M_NOWAIT|M_ZERO);
if (!xbe) {
- interp_list_runlock();
+ sx_sunlock(&interp_list_sx);
return (ENOMEM);
}
@@ -477,7 +420,7 @@
if (error)
break;
}
- interp_list_runlock();
+ sx_sunlock(&interp_list_sx);
if (!error)
error = SYSCTL_OUT(req, xbe, sizeof(*xbe) * count);
@@ -614,7 +557,7 @@
int i;
size_t sz;
- interp_list_assert_rlocked();
+ sx_assert(&interp_list_sx, SA_LOCKED);
SLIST_FOREACH(ibe, &interpreter_list, link) {
if (!(IBF_ENABLED & ibe->ibe_flags))
@@ -651,15 +594,15 @@
char *s, *d;
/* Do we have an interpreter for the given image header? */
- interp_list_rlock();
+ sx_slock(&interp_list_sx);
if ((ibe = imgact_binmisc_find_interpreter(image_header)) == NULL) {
- interp_list_runlock();
+ sx_sunlock(&interp_list_sx);
return (-1);
}
/* No interpreter nesting allowed. */
if (imgp->interpreted & IMGACT_BINMISC) {
- interp_list_runlock();
+ sx_sunlock(&interp_list_sx);
return (ENOEXEC);
}
@@ -707,7 +650,7 @@
default:
/* Hmm... This shouldn't happen. */
- interp_list_runlock();
+ sx_sunlock(&interp_list_sx);
printf("%s: Unknown macro #%c sequence in "
"interpreter string\n", KMOD_NAME, *(s + 1));
error = EINVAL;
@@ -718,15 +661,12 @@
/* Check to make sure we won't overrun the stringspace. */
if (offset > imgp->args->stringspace) {
- interp_list_runlock();
+ sx_sunlock(&interp_list_sx);
error = E2BIG;
goto done;
}
- /*
- * Make room for the interpreter. Doing an overlapping copy so
- * bcopy() must be used.
- */
+ /* Make room for the interpreter */
bcopy(imgp->args->begin_argv, imgp->args->begin_argv + offset,
imgp->args->endp - imgp->args->begin_argv);
@@ -781,7 +721,7 @@
s++;
}
*d = '\0';
- interp_list_runlock();
+ sx_sunlock(&interp_list_sx);
if (!error)
imgp->interpreter_name = imgp->args->begin_argv;
@@ -797,7 +737,7 @@
imgact_binmisc_init(void *arg)
{
- mtx_init(&interp_list_mtx, KMOD_NAME, NULL, MTX_DEF);
+ sx_init(&interp_list_sx, KMOD_NAME);
}
static void
@@ -806,15 +746,15 @@
imgact_binmisc_entry_t *ibe, *ibe_tmp;
/* Free all the interpreters. */
- interp_list_wlock();
+ sx_xlock(&interp_list_sx);
SLIST_FOREACH_SAFE(ibe, &interpreter_list, link, ibe_tmp) {
SLIST_REMOVE(&interpreter_list, ibe, imgact_binmisc_entry,
link);
imgact_binmisc_destroy_entry(ibe);
}
- interp_list_wunlock();
+ sx_xunlock(&interp_list_sx);
- mtx_destroy(&interp_list_mtx);
+ sx_destroy(&interp_list_sx);
}
SYSINIT(imgact_binmisc, SI_SUB_EXEC, SI_ORDER_MIDDLE, imgact_binmisc_init, 0);

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