nfsd4: allow nfs4 state startup to fail

[safe/jmp/linux-2.6] / include / linux / kmod.h

diff --git a/include/linux/kmod.h b/include/linux/kmod.h
index cc8e674..384ca8b 100644 (file)
--- a/include/linux/kmod.h
+++ b/include/linux/kmod.h
@@ -19,32 +19,83 @@
  *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
+#include <linux/gfp.h>
 #include <linux/stddef.h>
 #include <linux/errno.h>
 #include <linux/compiler.h>
 
 #define KMOD_PATH_LEN 256
 
-#ifdef CONFIG_KMOD
+#ifdef CONFIG_MODULES
 /* modprobe exit status on success, -ve on error.  Return value
  * usually useless though. */
-extern void kmod_sysfs_init(void);
-extern int request_module(const char * name, ...) __attribute__ ((format (printf, 1, 2)));
+extern int __request_module(bool wait, const char *name, ...) \
+       __attribute__((format(printf, 2, 3)));
+#define request_module(mod...) __request_module(true, mod)
+#define request_module_nowait(mod...) __request_module(false, mod)
+#define try_then_request_module(x, mod...) \
+       ((x) ?: (__request_module(true, mod), (x)))
 #else
-static inline void kmod_sysfs_init(void) {};
-static inline int request_module(const char * name, ...) { return -ENOSYS; }
+static inline int request_module(const char *name, ...) { return -ENOSYS; }
+static inline int request_module_nowait(const char *name, ...) { return -ENOSYS; }
+#define try_then_request_module(x, mod...) (x)
 #endif
 
-#define try_then_request_module(x, mod...) ((x) ?: (request_module(mod), (x)))
 
 struct key;
-extern int call_usermodehelper_keys(char *path, char *argv[], char *envp[],
-                                   struct key *session_keyring, int wait);
+struct file;
+struct subprocess_info;
+
+/* 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_setkeys(struct subprocess_info *info,
+                                struct key *session_keyring);
+int call_usermodehelper_stdinpipe(struct subprocess_info *sub_info,
+                                 struct file **filp);
+void call_usermodehelper_setcleanup(struct subprocess_info *info,
+                                   void (*cleanup)(char **argv, char **envp));
+
+enum umh_wait {
+       UMH_NO_WAIT = -1,       /* don't wait at all */
+       UMH_WAIT_EXEC = 0,      /* wait for the exec, but not the process */
+       UMH_WAIT_PROC = 1,      /* wait for the process to complete */
+};
+
+/* Actually execute the sub-process */
+int call_usermodehelper_exec(struct subprocess_info *info, enum umh_wait wait);
+
+/* Free the subprocess_info. This is only needed if you're not going
+   to call call_usermodehelper_exec */
+void call_usermodehelper_freeinfo(struct subprocess_info *info);
+
+static inline int
+call_usermodehelper(char *path, char **argv, char **envp, enum umh_wait wait)
+{
+       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;
+       return call_usermodehelper_exec(info, wait);
+}
 
 static inline int
-call_usermodehelper(char *path, char **argv, char **envp, int wait)
+call_usermodehelper_keys(char *path, char **argv, char **envp,
+                        struct key *session_keyring, enum umh_wait wait)
 {
-       return call_usermodehelper_keys(path, argv, envp, NULL, wait);
+       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_setkeys(info, session_keyring);
+       return call_usermodehelper_exec(info, wait);
 }
 
 extern void usermodehelper_init(void);
@@ -53,4 +104,7 @@ struct file;
 extern int call_usermodehelper_pipe(char *path, char *argv[], char *envp[],
                                    struct file **filp);
 
+extern int usermodehelper_disable(void);
+extern void usermodehelper_enable(void);
+
 #endif /* __LINUX_KMOD_H__ */