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Subject[PATCH 3/6] kmod: Move call_usermodehelper_fns() to .c file and unexport all it's helpers

If we move call_usermodehelper_fns() to kmod.c file and EXPORT_SYMBOL it
we can avoid exporting all it's helper functions:
call_usermodehelper_setup
call_usermodehelper_setfns
call_usermodehelper_exec
And make all of them static to kmod.c

Since the optimizer will see all these as a single call site it will inline them
inside call_usermodehelper_fns(). So we loose the call to _fns but gain 3
calls to the helpers. (Not that it matters)

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
---
include/linux/kmod.h | 30 ++----------------------------
kernel/kmod.c | 25 ++++++++++++++++++++++---
2 files changed, 24 insertions(+), 31 deletions(-)
diff --git a/include/linux/kmod.h b/include/linux/kmod.h
index ba89dc2..ae3f9623 100644
--- a/include/linux/kmod.h
+++ b/include/linux/kmod.h
@@ -66,36 +66,10 @@ struct subprocess_info {
void *data;
};

-/* Allocate a subprocess_info structure */
-struct subprocess_info *call_usermodehelper_setup(char *path, char **argv,
- char **envp, gfp_t gfp_mask);
-
-/* Set various pieces of state into the subprocess_info structure */
-void call_usermodehelper_setfns(struct subprocess_info *info,
- int (*init)(struct subprocess_info *info, struct cred *new),
- void (*cleanup)(struct subprocess_info *info),
- void *data);
-
-/* Actually execute the sub-process */
-int call_usermodehelper_exec(struct subprocess_info *info, int wait);
-
-static inline int
+extern int
call_usermodehelper_fns(char *path, char **argv, char **envp, int wait,
int (*init)(struct subprocess_info *info, struct cred *new),
- void (*cleanup)(struct subprocess_info *), void *data)
-{
- struct subprocess_info *info;
- gfp_t gfp_mask = (wait == UMH_NO_WAIT) ? GFP_ATOMIC : GFP_KERNEL;
-
- info = call_usermodehelper_setup(path, argv, envp, gfp_mask);
-
- if (info == NULL)
- return -ENOMEM;
-
- call_usermodehelper_setfns(info, init, cleanup, data);
-
- return call_usermodehelper_exec(info, wait);
-}
+ void (*cleanup)(struct subprocess_info *), void *data);

static inline int
call_usermodehelper(char *path, char **argv, char **envp, int wait)
diff --git a/kernel/kmod.c b/kernel/kmod.c
index c5af66a..309299a 100644
--- a/kernel/kmod.c
+++ b/kernel/kmod.c
@@ -422,6 +422,7 @@ static void helper_unlock(void)
* structure. This should be passed to call_usermodehelper_exec to
* exec the process and free the structure.
*/
+static
struct subprocess_info *call_usermodehelper_setup(char *path, char **argv,
char **envp, gfp_t gfp_mask)
{
@@ -437,7 +438,6 @@ struct subprocess_info *call_usermodehelper_setup(char *path, char **argv,
out:
return sub_info;
}
-EXPORT_SYMBOL(call_usermodehelper_setup);

/**
* call_usermodehelper_setfns - set a cleanup/init function
@@ -455,6 +455,7 @@ struct subprocess_info *call_usermodehelper_setup(char *path, char **argv,
* Function must be runnable in either a process context or the
* context in which call_usermodehelper_exec is called.
*/
+static
void call_usermodehelper_setfns(struct subprocess_info *info,
int (*init)(struct subprocess_info *info, struct cred *new),
void (*cleanup)(struct subprocess_info *info),
@@ -464,7 +465,6 @@ void call_usermodehelper_setfns(struct subprocess_info *info,
info->init = init;
info->data = data;
}
-EXPORT_SYMBOL(call_usermodehelper_setfns);

/**
* call_usermodehelper_exec - start a usermode application
@@ -478,6 +478,7 @@ void call_usermodehelper_setfns(struct subprocess_info *info,
* asynchronously if wait is not set, and runs as a child of keventd.
* (ie. it runs with full root capabilities).
*/
+static
int call_usermodehelper_exec(struct subprocess_info *sub_info, int wait)
{
DECLARE_COMPLETION_ONSTACK(done);
@@ -519,7 +520,25 @@ int call_usermodehelper_exec(struct subprocess_info *sub_info, int wait)
helper_unlock();
return retval;
}
-EXPORT_SYMBOL(call_usermodehelper_exec);
+
+int call_usermodehelper_fns(
+ char *path, char **argv, char **envp, int wait,
+ int (*init)(struct subprocess_info *info, struct cred *new),
+ void (*cleanup)(struct subprocess_info *), void *data)
+{
+ struct subprocess_info *info;
+ gfp_t gfp_mask = (wait == UMH_NO_WAIT) ? GFP_ATOMIC : GFP_KERNEL;
+
+ info = call_usermodehelper_setup(path, argv, envp, gfp_mask);
+
+ if (info == NULL)
+ return -ENOMEM;
+
+ call_usermodehelper_setfns(info, init, cleanup, data);
+
+ return call_usermodehelper_exec(info, wait);
+}
+EXPORT_SYMBOL(call_usermodehelper_fns);

static int proc_cap_handler(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp, loff_t *ppos)
--
1.7.6.5



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