[PATCH] devfs: Remove devfs from the init code

From: Greg KH
Date: Tue Jun 21 2005 - 02:53:22 EST

[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@xxxxxxx>

---
commit a11119341f9337cda564a7a37ec24749dda092f9
tree ef8fe72752a25e1930b738bee0b357fa5a781e67
parent 7780cade30d7fb5b9bebb67ccd5bb76f9a28fb23
author Greg Kroah-Hartman <gregkh@xxxxxxx> Mon, 20 Jun 2005 21:15:16 -0700
committer Greg Kroah-Hartman <gregkh@xxxxxxx> Mon, 20 Jun 2005 23:13:31 -0700

include/linux/devfs_fs_kernel.h | 4 -
init/Makefile | 1
init/do_mounts.c | 8 +-
init/do_mounts.h | 15 ----
init/do_mounts_devfs.c | 137 ---------------------------------------
init/do_mounts_initrd.c | 6 +-
init/do_mounts_md.c | 7 +-
init/do_mounts_rd.c | 4 +
8 files changed, 10 insertions(+), 172 deletions(-)

diff --git a/include/linux/devfs_fs_kernel.h b/include/linux/devfs_fs_kernel.h
--- a/include/linux/devfs_fs_kernel.h
+++ b/include/linux/devfs_fs_kernel.h
@@ -33,8 +33,4 @@ static inline int devfs_register_tape(co
static inline void devfs_unregister_tape(int num)
{
}
-static inline void mount_devfs_fs(void)
-{
- return;
-}
#endif /* _LINUX_DEVFS_FS_KERNEL_H */
diff --git a/init/Makefile b/init/Makefile
--- a/init/Makefile
+++ b/init/Makefile
@@ -6,7 +6,6 @@ obj-y := main.o version.o mounts.o in
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
--- a/init/do_mounts.c
+++ b/init/do_mounts.c
@@ -322,7 +322,7 @@ 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;
@@ -383,7 +383,7 @@ 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);
}

@@ -394,8 +394,6 @@ 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);
@@ -421,10 +419,8 @@ 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
--- a/init/do_mounts.h
+++ b/init/do_mounts.h
@@ -16,25 +16,12 @@ 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
--- 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
--- a/init/do_mounts_initrd.c
+++ b/init/do_mounts_initrd.c
@@ -44,7 +44,7 @@ static void __init handle_initrd(void)
int i, 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 ();

pid = kernel_thread(do_linuxrc, "/linuxrc", SIGCHLD);
if (pid > 0) {
@@ -70,7 +69,6 @@ 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");
@@ -103,7 +101,7 @@ 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
--- a/init/do_mounts_md.c
+++ b/init/do_mounts_md.c
@@ -129,19 +129,18 @@ 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];
@@ -276,7 +275,7 @@ __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
--- 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");
}


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