The FREE_CONST macro is of questionable value, as reviewers have pointed
out. The users of this macro were mostly functions that called
uevent_get_dm_xyz(). But these functions don't need to return const char*,
as they allocate the strings they return. So my change of the prototype
was wrong. This patch reverts it. The few other users of FREE_CONST can
also be reverted to use char* instead of const char* with negligible risk.
Fixes: "libmultipath: fix compiler warnings for -Wcast-qual"
Fixes: "libmultipath: const qualifier for wwid and alias"
(Note: this reverts changes not committed upstream. But as these changes are
deeply in the middle of my large-ish series of patches, it's probably easier
to simply add this patch on top than to rebase the whole series).
Signed-off-by: Martin Wilck <mwilck@xxxxxxxx>
---
libmultipath/devmapper.c | 7 +++----
libmultipath/memory.h | 6 ------
libmultipath/uevent.c | 12 ++++++------
libmultipath/uevent.h | 6 +++---
multipathd/main.c | 16 ++++++++--------
tests/uevent.c | 16 ++++++++--------
6 files changed, 28 insertions(+), 35 deletions(-)
diff --git a/libmultipath/devmapper.c b/libmultipath/devmapper.c
index 607aea8dc1fc..767d87c8399f 100644
--- a/libmultipath/devmapper.c
+++ b/libmultipath/devmapper.c
@@ -27,7 +27,6 @@
#include <sys/types.h>
#include <time.h>
-#define FREE_CONST(p) do { free((void*)(unsigned long)p); p = NULL; } while(0)
#define MAX_WAIT 5
#define LOOPS_PER_SEC 5
@@ -1415,8 +1414,8 @@ out:
void dm_reassign_deps(char *table, const char *dep, const char *newdep)
{
- char *n;
- const char *p, *newtable;
+ char *n, *newtable;
+ const char *p;
newtable = strdup(table);
if (!newtable)
@@ -1427,7 +1426,7 @@ void dm_reassign_deps(char *table, const char *dep, const char *newdep)
n += strlen(newdep);
p += strlen(dep);
strcat(n, p);
- FREE_CONST(newtable);
+ FREE(newtable);
}
int dm_reassign_table(const char *name, char *old, char *new)
diff --git a/libmultipath/memory.h b/libmultipath/memory.h
index 63f59d80584c..a3c478e24bd1 100644
--- a/libmultipath/memory.h
+++ b/libmultipath/memory.h
@@ -43,7 +43,6 @@ int debug;
(__FILE__), (char *)(__FUNCTION__), (__LINE__)) )
#define STRDUP(n) ( dbg_strdup((n), \
(__FILE__), (char *)(__FUNCTION__), (__LINE__)) )
-#define FREE_CONST(p) do { FREE((void*)(unsigned long)p); } while(0)
/* Memory debug prototypes defs */
extern void *dbg_malloc(unsigned long, char *, char *, int);
@@ -56,11 +55,6 @@ extern void dbg_free_final(char *);
#define MALLOC(n) (calloc(1,(n)))
#define FREE(p) do { free(p); p = NULL; } while(0)
-/*
- * Double cast to avoid warnings with -Wcast-qual
- * use this for valid free() operations on const pointers
- */
-#define FREE_CONST(p) do { free((void*)(unsigned long)p); p = NULL; } while(0)
#define REALLOC(p,n) (realloc((p),(n)))
#define STRDUP(n) (strdup(n))
diff --git a/libmultipath/uevent.c b/libmultipath/uevent.c
index 685ef3362c6d..59d4cad88ca3 100644
--- a/libmultipath/uevent.c
+++ b/libmultipath/uevent.c
@@ -157,7 +157,7 @@ static int uevent_get_env_positive_int(const struct uevent *uev,
void
uevent_get_wwid(struct uevent *uev)
{
- const char *uid_attribute;
+ char *uid_attribute;
const char *val;
struct config * conf;
@@ -168,7 +168,7 @@ uevent_get_wwid(struct uevent *uev)
val = uevent_get_env_var(uev, uid_attribute);
if (val)
uev->wwid = val;
- FREE_CONST(uid_attribute);
+ FREE(uid_attribute);
}
bool
@@ -907,7 +907,7 @@ int uevent_get_disk_ro(const struct uevent *uev)
return uevent_get_env_positive_int(uev, "DISK_RO");
}
-static const char *uevent_get_dm_str(const struct uevent *uev, char *attr)
+static char *uevent_get_dm_str(const struct uevent *uev, char *attr)
{
const char *tmp = uevent_get_env_var(uev, attr);
@@ -916,17 +916,17 @@ static const char *uevent_get_dm_str(const struct uevent *uev, char *attr)
return strdup(tmp);
}
-const char *uevent_get_dm_name(const struct uevent *uev)
+char *uevent_get_dm_name(const struct uevent *uev)
{
return uevent_get_dm_str(uev, "DM_NAME");
}
-const char *uevent_get_dm_path(const struct uevent *uev)
+char *uevent_get_dm_path(const struct uevent *uev)
{
return uevent_get_dm_str(uev, "DM_PATH");
}
-const char *uevent_get_dm_action(const struct uevent *uev)
+char *uevent_get_dm_action(const struct uevent *uev)
{
return uevent_get_dm_str(uev, "DM_ACTION");
}
diff --git a/libmultipath/uevent.h b/libmultipath/uevent.h
index cb5347e45c2b..0aa867510f28 100644
--- a/libmultipath/uevent.h
+++ b/libmultipath/uevent.h
@@ -36,9 +36,9 @@ int uevent_dispatch(int (*store_uev)(struct uevent *, void * trigger_data),
int uevent_get_major(const struct uevent *uev);
int uevent_get_minor(const struct uevent *uev);
int uevent_get_disk_ro(const struct uevent *uev);
-const char *uevent_get_dm_name(const struct uevent *uev);
-const char *uevent_get_dm_path(const struct uevent *uev);
-const char *uevent_get_dm_action(const struct uevent *uev);
+char *uevent_get_dm_name(const struct uevent *uev);
+char *uevent_get_dm_path(const struct uevent *uev);
+char *uevent_get_dm_action(const struct uevent *uev);
bool uevent_is_mpath(const struct uevent *uev);
#endif /* _UEVENT_H */
diff --git a/multipathd/main.c b/multipathd/main.c
index 6d502aceb252..f85995810950 100644
--- a/multipathd/main.c
+++ b/multipathd/main.c
@@ -392,7 +392,7 @@ flush_map(struct multipath * mpp, struct vectors * vecs, int nopaths)
static int
uev_add_map (struct uevent * uev, struct vectors * vecs)
{
- const char *alias;
+ char *alias;
int major = -1, minor = -1, rc;
condlog(3, "%s: add map (uevent)", uev->kernel);
@@ -413,7 +413,7 @@ uev_add_map (struct uevent * uev, struct vectors * vecs)
pthread_testcancel();
rc = ev_add_map(uev->kernel, alias, vecs);
lock_cleanup_pop(vecs->lock);
- FREE_CONST(alias);
+ FREE(alias);
return rc;
}
@@ -487,7 +487,7 @@ ev_add_map (char * dev, const char * alias, struct vectors * vecs)
static int
uev_remove_map (struct uevent * uev, struct vectors * vecs)
{
- const char *alias;
+ char *alias;
int minor;
struct multipath *mpp;
@@ -519,7 +519,7 @@ uev_remove_map (struct uevent * uev, struct vectors * vecs)
remove_map_and_stop_waiter(mpp, vecs, 1);
out:
lock_cleanup_pop(vecs->lock);
- FREE_CONST(alias);
+ FREE(alias);
return 0;
}
@@ -1005,7 +1005,7 @@ out:
static int
uev_pathfail_check(struct uevent *uev, struct vectors *vecs)
{
- const char *action = NULL, *devt = NULL;
+ char *action = NULL, *devt = NULL;
struct path *pp;
int r = 1;
@@ -1032,11 +1032,11 @@ uev_pathfail_check(struct uevent *uev, struct vectors *vecs)
pp->dev);
out_lock:
lock_cleanup_pop(vecs->lock);
- FREE_CONST(devt);
- FREE_CONST(action);
+ FREE(devt);
+ FREE(action);
return r;
out:
- FREE_CONST(action);
+ FREE(action);
return 1;
}
diff --git a/tests/uevent.c b/tests/uevent.c
index b7d6458710f4..acfcb14a5def 100644
--- a/tests/uevent.c
+++ b/tests/uevent.c
@@ -169,44 +169,44 @@ static void test_major_bad_8(void **state)
static void test_dm_name_good(void **state)
{
struct uevent *uev = *state;
- const char *name = uevent_get_dm_name(uev);
+ char *name = uevent_get_dm_name(uev);
assert_string_equal(name, DM_NAME);
- free((void*)name);
+ FREE(name);
}
static void test_dm_name_bad_0(void **state)
{
struct uevent *uev = *state;
- const char *name;
+ char *name;
uev->envp[3] = "DM_NAME" DM_NAME;
name = uevent_get_dm_name(uev);
assert_ptr_equal(name, NULL);
- free((void*)name);
+ FREE(name);
}
static void test_dm_name_bad_1(void **state)
{
struct uevent *uev = *state;
- const char *name;
+ char *name;
uev->envp[3] = "DM_NAMES=" DM_NAME;
name = uevent_get_dm_name(uev);
assert_ptr_equal(name, NULL);
- free((void*)name);
+ FREE(name);
}
static void test_dm_name_good_1(void **state)
{
struct uevent *uev = *state;
- const char *name;
+ char *name;
/* Note we change index 2 here */
uev->envp[2] = "DM_NAME=" DM_NAME;
name = uevent_get_dm_name(uev);
assert_string_equal(name, DM_NAME);
- free((void*)name);
+ FREE(name);
}
static void test_dm_uuid_false_0(void **state)
--
2.16.1
--
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