[PATCH] devfs: Remove devfs from the init code

This patch removes the devfs code from the init/ directory.

Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

7 files changed, 10 insertions, 168 deletions

diff --git a/init/Makefile b/init/Makefile
index a2300078f2b7..633a268d270d 100644
--- a/init/Makefile
+++ b/init/Makefile
@@ -6,7 +6,6 @@ obj-y				:= main.o version.o mounts.o initramfs.o
 obj-$(CONFIG_GENERIC_CALIBRATE_DELAY) += calibrate.o
 
 mounts-y                        := do_mounts.o
-mounts-$(CONFIG_DEVFS_FS)       += do_mounts_devfs.o
 mounts-$(CONFIG_BLK_DEV_RAM)    += do_mounts_rd.o
 mounts-$(CONFIG_BLK_DEV_INITRD) += do_mounts_initrd.o
 mounts-$(CONFIG_BLK_DEV_MD)     += do_mounts_md.o
diff --git a/init/do_mounts.c b/init/do_mounts.c
index 21b3b8f33a72..94aeec7aa917 100644
--- a/init/do_mounts.c
+++ b/init/do_mounts.c
@@ -325,7 +325,7 @@ static int __init mount_nfs_root(void)
 {
         void *data = nfs_root_data();
 
-        create_dev("/dev/root", ROOT_DEV, NULL);
+        create_dev("/dev/root", ROOT_DEV);
         if (data &&
             do_mount_root("/dev/root", "nfs", root_mountflags, data) == 0)
                 return 1;
@@ -386,7 +386,7 @@ void __init mount_root(void)
                         change_floppy("root floppy");
         }
 #endif
-        create_dev("/dev/root", ROOT_DEV, root_device_name);
+        create_dev("/dev/root", ROOT_DEV);
         mount_block_root("/dev/root", root_mountflags);
 }
 
@@ -397,8 +397,6 @@ void __init prepare_namespace(void)
 {
         int is_floppy;
 
-        mount_devfs();
-
         if (root_delay) {
                 printk(KERN_INFO "Waiting %dsec before mounting root device...\n",
                        root_delay);
@@ -428,10 +426,8 @@ void __init prepare_namespace(void)
 
         mount_root();
 out:
-        umount_devfs("/dev");
         sys_mount(".", "/", NULL, MS_MOVE, NULL);
         sys_chroot(".");
         security_sb_post_mountroot();
-        mount_devfs_fs ();
 }
 
diff --git a/init/do_mounts.h b/init/do_mounts.h
index e0a7ac9649e1..66548efe4c3c 100644
--- a/init/do_mounts.h
+++ b/init/do_mounts.h
@@ -15,25 +15,12 @@ void  mount_root(void);
 extern int root_mountflags;
 extern char *root_device_name;
 
-#ifdef CONFIG_DEVFS_FS
-
-void mount_devfs(void);
-void umount_devfs(char *path);
-int  create_dev(char *name, dev_t dev, char *devfs_name);
-
-#else
-
-static inline void mount_devfs(void) {}
-static inline void umount_devfs(const char *path) {}
-
-static inline int create_dev(char *name, dev_t dev, char *devfs_name)
+static inline int create_dev(char *name, dev_t dev)
 {
         sys_unlink(name);
         return sys_mknod(name, S_IFBLK|0600, new_encode_dev(dev));
 }
 
-#endif
-
 #if BITS_PER_LONG == 32
 static inline u32 bstat(char *name)
 {
diff --git a/init/do_mounts_devfs.c b/init/do_mounts_devfs.c
deleted file mode 100644
index cc526474690a..000000000000
--- a/init/do_mounts_devfs.c
+++ /dev/null
@@ -1,137 +0,0 @@
-
-#include <linux/kernel.h>
-#include <linux/dirent.h>
-#include <linux/string.h>
-
-#include "do_mounts.h"
-
-void __init mount_devfs(void)
-{
-        sys_mount("devfs", "/dev", "devfs", 0, NULL);
-}
-
-void __init umount_devfs(char *path)
-{
-        sys_umount(path, 0);
-}
-
-/*
- * If the dir will fit in *buf, return its length.  If it won't fit, return
- * zero.  Return -ve on error.
- */
-static int __init do_read_dir(int fd, void *buf, int len)
-{
-        long bytes, n;
-        char *p = buf;
-        sys_lseek(fd, 0, 0);
-
-        for (bytes = 0; bytes < len; bytes += n) {
-                n = sys_getdents64(fd, (struct linux_dirent64 *)(p + bytes),
-                                        len - bytes);
-                if (n < 0)
-                        return n;
-                if (n == 0)
-                        return bytes;
-        }
-        return 0;
-}
-
-/*
- * Try to read all of a directory.  Returns the contents at *p, which
- * is kmalloced memory.  Returns the number of bytes read at *len.  Returns
- * NULL on error.
- */
-static void * __init read_dir(char *path, int *len)
-{
-        int size;
-        int fd = sys_open(path, 0, 0);
-
-        *len = 0;
-        if (fd < 0)
-                return NULL;
-
-        for (size = 1 << 9; size <= (PAGE_SIZE << MAX_ORDER); size <<= 1) {
-                void *p = kmalloc(size, GFP_KERNEL);
-                int n;
-                if (!p)
-                        break;
-                n = do_read_dir(fd, p, size);
-                if (n > 0) {
-                        sys_close(fd);
-                        *len = n;
-                        return p;
-                }
-                kfree(p);
-                if (n == -EINVAL)
-                        continue;       /* Try a larger buffer */
-                if (n < 0)
-                        break;
-        }
-        sys_close(fd);
-        return NULL;
-}
-
-/*
- * recursively scan <path>, looking for a device node of type <dev>
- */
-static int __init find_in_devfs(char *path, unsigned dev)
-{
-        char *end = path + strlen(path);
-        int rest = path + 64 - end;
-        int size;
-        char *p = read_dir(path, &size);
-        char *s;
-
-        if (!p)
-                return -1;
-        for (s = p; s < p + size; s += ((struct linux_dirent64 *)s)->d_reclen) {
-                struct linux_dirent64 *d = (struct linux_dirent64 *)s;
-                if (strlen(d->d_name) + 2 > rest)
-                        continue;
-                switch (d->d_type) {
-                        case DT_BLK:
-                                sprintf(end, "/%s", d->d_name);
-                                if (bstat(path) != dev)
-                                        break;
-                                kfree(p);
-                                return 0;
-                        case DT_DIR:
-                                if (strcmp(d->d_name, ".") == 0)
-                                        break;
-                                if (strcmp(d->d_name, "..") == 0)
-                                        break;
-                                sprintf(end, "/%s", d->d_name);
-                                if (find_in_devfs(path, dev) < 0)
-                                        break;
-                                kfree(p);
-                                return 0;
-                }
-        }
-        kfree(p);
-        return -1;
-}
-
-/*
- * create a device node called <name> which points to
- * <devfs_name> if possible, otherwise find a device node
- * which matches <dev> and make <name> a symlink pointing to it.
- */
-int __init create_dev(char *name, dev_t dev, char *devfs_name)
-{
-        char path[64];
-
-        sys_unlink(name);
-        if (devfs_name && devfs_name[0]) {
-                if (strncmp(devfs_name, "/dev/", 5) == 0)
-                        devfs_name += 5;
-                sprintf(path, "/dev/%s", devfs_name);
-                if (sys_access(path, 0) == 0)
-                        return sys_symlink(devfs_name, name);
-        }
-        if (!dev)
-                return -1;
-        strcpy(path, "/dev");
-        if (find_in_devfs(path, new_encode_dev(dev)) < 0)
-                return -1;
-        return sys_symlink(path + 5, name);
-}
diff --git a/init/do_mounts_initrd.c b/init/do_mounts_initrd.c
index 405f9031af87..a06f037fa000 100644
--- a/init/do_mounts_initrd.c
+++ b/init/do_mounts_initrd.c
@@ -44,7 +44,7 @@ static void __init handle_initrd(void)
         int pid;
 
         real_root_dev = new_encode_dev(ROOT_DEV);
-        create_dev("/dev/root.old", Root_RAM0, NULL);
+        create_dev("/dev/root.old", Root_RAM0);
         /* mount initrd on rootfs' /root */
         mount_block_root("/dev/root.old", root_mountflags & ~MS_RDONLY);
         sys_mkdir("/old", 0700);
@@ -54,7 +54,6 @@ static void __init handle_initrd(void)
         sys_chdir("/root");
         sys_mount(".", "/", NULL, MS_MOVE, NULL);
         sys_chroot(".");
-        mount_devfs_fs ();
 
         current->flags |= PF_NOFREEZE;
         pid = kernel_thread(do_linuxrc, "/linuxrc", SIGCHLD);
@@ -71,7 +70,6 @@ static void __init handle_initrd(void)
         sys_chroot(".");
         sys_close(old_fd);
         sys_close(root_fd);
-        umount_devfs("/old/dev");
 
         if (new_decode_dev(real_root_dev) == Root_RAM0) {
                 sys_chdir("/old");
@@ -107,7 +105,7 @@ static void __init handle_initrd(void)
 int __init initrd_load(void)
 {
         if (mount_initrd) {
-                create_dev("/dev/ram", Root_RAM0, NULL);
+                create_dev("/dev/ram", Root_RAM0);
                 /*
                  * Load the initrd data into /dev/ram0. Execute it as initrd
                  * unless /dev/ram0 is supposed to be our actual root device,
diff --git a/init/do_mounts_md.c b/init/do_mounts_md.c
index f6f36806f84a..2429e1bf8c60 100644
--- a/init/do_mounts_md.c
+++ b/init/do_mounts_md.c
@@ -125,19 +125,18 @@ static void __init md_setup_drive(void)
                 int err = 0;
                 char *devname;
                 mdu_disk_info_t dinfo;
-                char name[16], devfs_name[16];
+                char name[16];
 
                 minor = md_setup_args[ent].minor;
                 partitioned = md_setup_args[ent].partitioned;
                 devname = md_setup_args[ent].device_names;
 
                 sprintf(name, "/dev/md%s%d", partitioned?"_d":"", minor);
-                sprintf(devfs_name, "/dev/md/%s%d", partitioned?"d":"", minor);
                 if (partitioned)
                         dev = MKDEV(mdp_major, minor << MdpMinorShift);
                 else
                         dev = MKDEV(MD_MAJOR, minor);
-                create_dev(name, dev, devfs_name);
+                create_dev(name, dev);
                 for (i = 0; i < MD_SB_DISKS && devname != 0; i++) {
                         char *p;
                         char comp_name[64];
@@ -272,7 +271,7 @@ __setup("md=", md_setup);
 
 void __init md_run_setup(void)
 {
-        create_dev("/dev/md0", MKDEV(MD_MAJOR, 0), "md/0");
+        create_dev("/dev/md0", MKDEV(MD_MAJOR, 0));
         if (raid_noautodetect)
                 printk(KERN_INFO "md: Skipping autodetection of RAID arrays. (raid=noautodetect)\n");
         else {
diff --git a/init/do_mounts_rd.c b/init/do_mounts_rd.c
index c2683fcd792d..ed652f40f075 100644
--- a/init/do_mounts_rd.c
+++ b/init/do_mounts_rd.c
@@ -262,8 +262,8 @@ int __init rd_load_disk(int n)
 {
         if (rd_prompt)
                 change_floppy("root floppy disk to be loaded into RAM disk");
-        create_dev("/dev/root", ROOT_DEV, root_device_name);
-        create_dev("/dev/ram", MKDEV(RAMDISK_MAJOR, n), NULL);
+        create_dev("/dev/root", ROOT_DEV);
+        create_dev("/dev/ram", MKDEV(RAMDISK_MAJOR, n));
         return rd_load_image("/dev/root");
 }