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