76 lines
2.6 KiB
Diff
76 lines
2.6 KiB
Diff
From: Peter Korsgaard <jacmet@sunsite.dk>
|
|
|
|
Make devtmpfs available on (embedded) configurations without SHMEM/TMPFS,
|
|
using ramfs instead.
|
|
|
|
Saves ~15KB.
|
|
|
|
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
|
|
Acked-by: Kay Sievers <kay.sievers@vrfy.org>
|
|
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
|
|
--- a/drivers/base/Kconfig
|
|
+++ b/drivers/base/Kconfig
|
|
@@ -18,9 +18,9 @@ config UEVENT_HELPER_PATH
|
|
|
|
config DEVTMPFS
|
|
bool "Maintain a devtmpfs filesystem to mount at /dev"
|
|
- depends on HOTPLUG && SHMEM && TMPFS
|
|
+ depends on HOTPLUG
|
|
help
|
|
- This creates a tmpfs filesystem instance early at bootup.
|
|
+ This creates a tmpfs/ramfs filesystem instance early at bootup.
|
|
In this filesystem, the kernel driver core maintains device
|
|
nodes with their default names and permissions for all
|
|
registered devices with an assigned major/minor number.
|
|
@@ -33,6 +33,9 @@ config DEVTMPFS
|
|
functional /dev without any further help. It also allows simple
|
|
rescue systems, and reliably handles dynamic major/minor numbers.
|
|
|
|
+ Notice: if CONFIG_TMPFS isn't enabled, the simpler ramfs
|
|
+ file system will be used instead.
|
|
+
|
|
config DEVTMPFS_MOUNT
|
|
bool "Automount devtmpfs at /dev, after the kernel mounted the rootfs"
|
|
depends on DEVTMPFS
|
|
--- a/drivers/base/devtmpfs.c
|
|
+++ b/drivers/base/devtmpfs.c
|
|
@@ -20,6 +20,7 @@
|
|
#include <linux/namei.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/shmem_fs.h>
|
|
+#include <linux/ramfs.h>
|
|
#include <linux/cred.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/init_task.h>
|
|
@@ -45,7 +46,11 @@ __setup("devtmpfs.mount=", mount_param);
|
|
static int dev_get_sb(struct file_system_type *fs_type, int flags,
|
|
const char *dev_name, void *data, struct vfsmount *mnt)
|
|
{
|
|
+#ifdef CONFIG_TMPFS
|
|
return get_sb_single(fs_type, flags, data, shmem_fill_super, mnt);
|
|
+#else
|
|
+ return get_sb_single(fs_type, flags, data, ramfs_fill_super, mnt);
|
|
+#endif
|
|
}
|
|
|
|
static struct file_system_type dev_fs_type = {
|
|
--- a/fs/ramfs/inode.c
|
|
+++ b/fs/ramfs/inode.c
|
|
@@ -214,7 +214,7 @@ static int ramfs_parse_options(char *data, struct ramfs_mount_opts *opts)
|
|
return 0;
|
|
}
|
|
|
|
-static int ramfs_fill_super(struct super_block * sb, void * data, int silent)
|
|
+int ramfs_fill_super(struct super_block *sb, void *data, int silent)
|
|
{
|
|
struct ramfs_fs_info *fsi;
|
|
struct inode *inode = NULL;
|
|
--- a/include/linux/ramfs.h
|
|
+++ b/include/linux/ramfs.h
|
|
@@ -20,4 +20,6 @@ extern const struct file_operations ramfs_file_operations;
|
|
extern const struct vm_operations_struct generic_file_vm_ops;
|
|
extern int __init init_rootfs(void);
|
|
|
|
+int ramfs_fill_super(struct super_block *sb, void *data, int silent);
|
|
+
|
|
#endif
|