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-rw-r--r--block/elevator.c16
-rw-r--r--include/linux/elevator.h5
-rw-r--r--include/linux/init.h1
-rw-r--r--init/do_mounts_initrd.c3
-rw-r--r--init/initramfs.c8
-rw-r--r--init/main.c16
6 files changed, 48 insertions, 1 deletions
diff --git a/block/elevator.c b/block/elevator.c
index 9edba1b..c2d61d5 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -136,6 +136,22 @@ static int __init elevator_setup(char *str)
__setup("elevator=", elevator_setup);
+/* called during boot to load the elevator chosen by the elevator param */
+void __init load_default_elevator_module(void)
+{
+ struct elevator_type *e;
+
+ if (!chosen_elevator[0])
+ return;
+
+ spin_lock(&elv_list_lock);
+ e = elevator_find(chosen_elevator);
+ spin_unlock(&elv_list_lock);
+
+ if (!e)
+ request_module("%s-iosched", chosen_elevator);
+}
+
static struct kobj_type elv_ktype;
static struct elevator_queue *elevator_alloc(struct request_queue *q,
diff --git a/include/linux/elevator.h b/include/linux/elevator.h
index c03af76..1866206 100644
--- a/include/linux/elevator.h
+++ b/include/linux/elevator.h
@@ -138,6 +138,7 @@ extern void elv_drain_elevator(struct request_queue *);
/*
* io scheduler registration
*/
+extern void __init load_default_elevator_module(void);
extern int elv_register(struct elevator_type *);
extern void elv_unregister(struct elevator_type *);
@@ -206,5 +207,9 @@ enum {
INIT_LIST_HEAD(&(rq)->csd.list); \
} while (0)
+#else /* CONFIG_BLOCK */
+
+static inline void load_default_elevator_module(void) { }
+
#endif /* CONFIG_BLOCK */
#endif
diff --git a/include/linux/init.h b/include/linux/init.h
index a799273..9230c94 100644
--- a/include/linux/init.h
+++ b/include/linux/init.h
@@ -161,6 +161,7 @@ extern unsigned int reset_devices;
/* used by init/main.c */
void setup_arch(char **);
void prepare_namespace(void);
+void __init load_default_modules(void);
extern void (*late_time_init)(void);
diff --git a/init/do_mounts_initrd.c b/init/do_mounts_initrd.c
index 5e4ded5..dfe606a 100644
--- a/init/do_mounts_initrd.c
+++ b/init/do_mounts_initrd.c
@@ -57,6 +57,9 @@ static void __init handle_initrd(void)
sys_mkdir("/old", 0700);
sys_chdir("/old");
+ /* try loading default modules from initrd */
+ load_default_modules();
+
/*
* In case that a resume from disk is carried out by linuxrc or one of
* its children, we need to tell the freezer not to wait for us.
diff --git a/init/initramfs.c b/init/initramfs.c
index 84c6bf1..a67ef9d 100644
--- a/init/initramfs.c
+++ b/init/initramfs.c
@@ -592,7 +592,7 @@ static int __init populate_rootfs(void)
initrd_end - initrd_start);
if (!err) {
free_initrd();
- return 0;
+ goto done;
} else {
clean_rootfs();
unpack_to_rootfs(__initramfs_start, __initramfs_size);
@@ -607,6 +607,7 @@ static int __init populate_rootfs(void)
sys_close(fd);
free_initrd();
}
+ done:
#else
printk(KERN_INFO "Unpacking initramfs...\n");
err = unpack_to_rootfs((char *)initrd_start,
@@ -615,6 +616,11 @@ static int __init populate_rootfs(void)
printk(KERN_EMERG "Initramfs unpacking failed: %s\n", err);
free_initrd();
#endif
+ /*
+ * Try loading default modules from initramfs. This gives
+ * us a chance to load before device_initcalls.
+ */
+ load_default_modules();
}
return 0;
}
diff --git a/init/main.c b/init/main.c
index baf1f0f..18efadb 100644
--- a/init/main.c
+++ b/init/main.c
@@ -70,6 +70,8 @@
#include <linux/perf_event.h>
#include <linux/file.h>
#include <linux/ptrace.h>
+#include <linux/blkdev.h>
+#include <linux/elevator.h>
#include <asm/io.h>
#include <asm/bugs.h>
@@ -794,6 +796,17 @@ static void __init do_pre_smp_initcalls(void)
do_one_initcall(*fn);
}
+/*
+ * This function requests modules which should be loaded by default and is
+ * called twice right after initrd is mounted and right before init is
+ * exec'd. If such modules are on either initrd or rootfs, they will be
+ * loaded before control is passed to userland.
+ */
+void __init load_default_modules(void)
+{
+ load_default_elevator_module();
+}
+
static int run_init_process(const char *init_filename)
{
argv_init[0] = init_filename;
@@ -898,4 +911,7 @@ static void __init kernel_init_freeable(void)
* we're essentially up and running. Get rid of the
* initmem segments and start the user-mode stuff..
*/
+
+ /* rootfs is available now, try loading default modules */
+ load_default_modules();
}
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