a7y18lte-ubports/android_kernel_samsung_universal7885
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devtmpfs: support !CONFIG_TMPFS

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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>
This commit is contained in:
Peter Korsgaard 2010-03-16 21:55:21 +01:00 committed by Greg Kroah-Hartman
parent 1653268b1b
commit da5e4ef7fd
4 changed files with 13 additions and 3 deletions
drivers/base
Kconfigdevtmpfs.c
fs/ramfs
inode.c
include/linux
ramfs.h

7
drivers/base/Kconfig
View File

@ -18,9 +18,9 @@ config UEVENT_HELPER_PATH
config DEVTMPFS config DEVTMPFS
bool "Maintain a devtmpfs filesystem to mount at /dev" bool "Maintain a devtmpfs filesystem to mount at /dev"
depends on HOTPLUG && SHMEM && TMPFS depends on HOTPLUG
help 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 In this filesystem, the kernel driver core maintains device
nodes with their default names and permissions for all nodes with their default names and permissions for all
registered devices with an assigned major/minor number. registered devices with an assigned major/minor number.
@ -33,6 +33,9 @@ config DEVTMPFS
functional /dev without any further help. It also allows simple functional /dev without any further help. It also allows simple
rescue systems, and reliably handles dynamic major/minor numbers. 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 config DEVTMPFS_MOUNT
bool "Automount devtmpfs at /dev, after the kernel mounted the rootfs" bool "Automount devtmpfs at /dev, after the kernel mounted the rootfs"
depends on DEVTMPFS depends on DEVTMPFS

5
drivers/base/devtmpfs.c
View File

@ -20,6 +20,7 @@
#include <linux/namei.h> #include <linux/namei.h>
#include <linux/fs.h> #include <linux/fs.h>
#include <linux/shmem_fs.h> #include <linux/shmem_fs.h>
#include <linux/ramfs.h>
#include <linux/cred.h> #include <linux/cred.h>
#include <linux/sched.h> #include <linux/sched.h>
#include <linux/init_task.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, static int dev_get_sb(struct file_system_type *fs_type, int flags,
const char *dev_name, void *data, struct vfsmount *mnt) const char *dev_name, void *data, struct vfsmount *mnt)
{ {
#ifdef CONFIG_TMPFS
return get_sb_single(fs_type, flags, data, shmem_fill_super, mnt); 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 = { static struct file_system_type dev_fs_type = {

2
fs/ramfs/inode.c
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@ -214,7 +214,7 @@ static int ramfs_parse_options(char *data, struct ramfs_mount_opts *opts)
return 0; 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 ramfs_fs_info *fsi;
struct inode *inode = NULL; struct inode *inode = NULL;

2
include/linux/ramfs.h
View File

@ -20,4 +20,6 @@ extern const struct file_operations ramfs_file_operations;
extern const struct vm_operations_struct generic_file_vm_ops; extern const struct vm_operations_struct generic_file_vm_ops;
extern int __init init_rootfs(void); extern int __init init_rootfs(void);
int ramfs_fill_super(struct super_block *sb, void *data, int silent);
#endif #endif