From: Kay Sievers Devtmpfs lets the kernel create a tmpfs very early at kernel initialization, before any driver-core device is registered. Every device with a major/minor will have a device node created in this tmpfs instance. After the rootfs is mounted by the kernel, the populated tmpfs is mounted at /dev. In initramfs "mount --move /dev /root/dev" can move it to the manually mounted root filesystem before changing into /root and /sbin/init is executed. The tmpfs instance can be changed and altered by userspace at any time, and in any way needed - just like today's udev-mounted tmpfs. Unmodified udev versions will run just fine on top of it, and will recognize an already existing kernel-created device node and use it. The default node permissions are root:root 0600. Proper permissions and user/group ownership, meaningful symlinks, all other policy besides the node name, still needs to be applied by udev, just as without devtmpfs. If a node is created by devtmps, devtmpfs will remove the device node when the device goes away. If the device node was created by userspace, or the devtmpfs created node was replaced by userspace, it will not be removed by devtmpfs. This makes init=/bin/sh work without any further userspace support. /dev will be fully populated and dynamic, and always reflect the current device state of the kernel. Especially in the face of the already implemented dynamic device numbers for block devices, this can be very helpful in a rescue situation, where static devices nodes will no longer work. Custom, embedded-like systems should be able to use this as a dynamic /dev directory without any need for aditional userspace tools. With the kernel populated /dev, existing initramfs or kernel-mount bootup logic can be optimized to be more efficient, and not to require a full coldplug run, which is currently needed to bootstrap the inital /dev directory content, before continuing bringing up the rest of the system. There will be no missed events to replay, because /dev is available before the first kernel device is registered with the driver-core. A coldplug run can take, depending on the speed of the system and the amount of devices which need to be handled, from one to several seconds. Signed-off-by: Kay Sievers Signed-off-by: Jan Blunck Signed-off-by: Greg Kroah-Hartman --- drivers/base/Kconfig | 17 ++ drivers/base/Makefile | 1 drivers/base/base.h | 6 drivers/base/core.c | 3 drivers/base/devtmpfs.c | 354 +++++++++++++++++++++++++++++++++++++++++++++++ drivers/base/init.c | 1 include/linux/device.h | 10 + include/linux/shmem_fs.h | 2 init/do_mounts.c | 2 init/initramfs.c | 2 init/main.c | 2 mm/shmem.c | 6 12 files changed, 401 insertions(+), 5 deletions(-) --- a/drivers/base/base.h +++ b/drivers/base/base.h @@ -134,3 +134,9 @@ static inline void module_add_driver(str struct device_driver *drv) { } static inline void module_remove_driver(struct device_driver *drv) { } #endif + +#ifdef CONFIG_DEVTMPFS +extern int devtmpfs_init(void); +#else +static inline int devtmpfs_init(void) { return 0; } +#endif --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -920,6 +920,8 @@ int device_add(struct device *dev) error = device_create_sys_dev_entry(dev); if (error) goto devtattrError; + + devtmpfs_create_node(dev); } error = device_add_class_symlinks(dev); @@ -1063,6 +1065,7 @@ void device_del(struct device *dev) if (parent) klist_del(&dev->p->knode_parent); if (MAJOR(dev->devt)) { + devtmpfs_delete_node(dev); device_remove_sys_dev_entry(dev); device_remove_file(dev, &devt_attr); } --- /dev/null +++ b/drivers/base/devtmpfs.c @@ -0,0 +1,354 @@ +/* + * /dev tmpfs device nodes + * + * Copyright (C) 2009, Kay Sievers + * + * During bootup, before any driver core device is registered, a tmpfs + * filesystem is created. Every device which requests a devno, will + * create a device node in this filesystem. The node is named after the + * the nameof the device, or the susbsytem can provide a custom name + * for the node. + * + * All devices are owned by root. This is intended to simplify bootup, and + * make it possible to delay the initial coldplug done by udev in userspace. + * + * It should also provide a simpler way for rescue systems to bring up a + * kernel with dynamic major/minor numbers. + */ + +#include +#include +#include +#include +#include +#include +#include + +static struct vfsmount *dev_mnt; + +#ifdef CONFIG_BLOCK +static inline int is_blockdev(struct device *dev) +{ + return dev->class == &block_class; +} +#else +static inline int is_blockdev(struct device *dev) { return 0; } +#endif + +static int dev_mkdir(const char *name, mode_t mode) +{ + struct nameidata nd; + struct dentry *dentry; + int err; + + err = vfs_path_lookup(dev_mnt->mnt_root, dev_mnt, + name, LOOKUP_PARENT, &nd); + if (err) + return err; + + dentry = lookup_create(&nd, 1); + if (!IS_ERR(dentry)) { + err = vfs_mkdir(nd.path.dentry->d_inode, dentry, mode); + dput(dentry); + } else { + err = PTR_ERR(dentry); + } + mutex_unlock(&nd.path.dentry->d_inode->i_mutex); + + path_put(&nd.path); + return err; +} + +static int dev_symlink(const char *target, const char *name) +{ + struct nameidata nd; + struct dentry *dentry; + int err; + + err = vfs_path_lookup(dev_mnt->mnt_root, dev_mnt, + name, LOOKUP_PARENT, &nd); + if (err) + return err; + + dentry = lookup_create(&nd, 0); + if (!IS_ERR(dentry)) { + err = vfs_symlink(nd.path.dentry->d_inode, dentry, target); + dput(dentry); + } + mutex_unlock(&nd.path.dentry->d_inode->i_mutex); + + path_put(&nd.path); + return err; +} + +static int create_path(const char *nodepath) +{ + char *path; + struct nameidata nd; + int err = 0; + + path = kstrdup(nodepath, GFP_KERNEL); + if (!path) + return -ENOMEM; + + err = vfs_path_lookup(dev_mnt->mnt_root, dev_mnt, + path, LOOKUP_PARENT, &nd); + if (err == 0) { + struct dentry *dentry; + + /* create directory right away */ + dentry = lookup_create(&nd, 1); + if (!IS_ERR(dentry)) { + err = vfs_mkdir(nd.path.dentry->d_inode, + dentry, 0775); + dput(dentry); + } + mutex_unlock(&nd.path.dentry->d_inode->i_mutex); + + path_put(&nd.path); + } else if (err == -ENOENT) { + char *s; + + /* parent directories do not exist, create them */ + s = path; + while (1) { + s = strchr(s, '/'); + if (!s) + break; + s[0] = '\0'; + err = dev_mkdir(path, 0755); + if (err && err != -EEXIST) + break; + s[0] = '/'; + s++; + } + } + + kfree(path); + return err; +} + +int devtmpfs_create_node(struct device *dev) +{ + const char *tmp = NULL; + const char *nodename; + mode_t mode; + struct nameidata nd; + struct dentry *dentry; + int err; + + if (!dev_mnt) + return 0; + + nodename = device_get_nodename(dev, &tmp); + if (!nodename) + return -ENOMEM; + + if (is_blockdev(dev)) + mode = S_IFBLK|0600; + else + mode = S_IFCHR|0600; + + err = vfs_path_lookup(dev_mnt->mnt_root, dev_mnt, + nodename, LOOKUP_PARENT, &nd); + if (err == -ENOENT) { + /* create missing parent directories */ + create_path(nodename); + err = vfs_path_lookup(dev_mnt->mnt_root, dev_mnt, + nodename, LOOKUP_PARENT, &nd); + if (err) + goto out_name; + } + + dentry = lookup_create(&nd, 0); + if (!IS_ERR(dentry)) { + err = vfs_mknod(nd.path.dentry->d_inode, + dentry, mode, dev->devt); + /* mark as kernel created inode */ + if (!err) + dentry->d_inode->i_private = &dev_mnt; + dput(dentry); + } else { + err = PTR_ERR(dentry); + } + mutex_unlock(&nd.path.dentry->d_inode->i_mutex); + + path_put(&nd.path); +out_name: + kfree(tmp); + return err; +} + +static int dev_rmdir(const char *name) +{ + struct nameidata nd; + struct dentry *dentry; + int err; + + err = vfs_path_lookup(dev_mnt->mnt_root, dev_mnt, + name, LOOKUP_PARENT, &nd); + if (err) + return err; + + mutex_lock_nested(&nd.path.dentry->d_inode->i_mutex, I_MUTEX_PARENT); + dentry = lookup_one_len(nd.last.name, nd.path.dentry, nd.last.len); + if (!IS_ERR(dentry)) { + if (dentry->d_inode) + err = vfs_rmdir(nd.path.dentry->d_inode, dentry); + else + err = -ENOENT; + dput(dentry); + } else { + err = PTR_ERR(dentry); + } + mutex_unlock(&nd.path.dentry->d_inode->i_mutex); + + path_put(&nd.path); + return err; +} + +static int delete_path(const char *nodepath) +{ + const char *path; + int err = 0; + + path = kstrdup(nodepath, GFP_KERNEL); + if (!path) + return -ENOMEM; + + while (1) { + char *base; + + base = strrchr(path, '/'); + if (!base) + break; + base[0] = '\0'; + err = dev_rmdir(path); + if (err) + break; + } + + kfree(path); + return err; +} + +static int dev_mynode(struct device *dev, struct inode *inode, struct kstat *stat) +{ + /* did we create it */ + if (inode->i_private != &dev_mnt) + return 0; + + /* does the dev_t match */ + if (is_blockdev(dev)) { + if (!S_ISBLK(stat->mode)) + return 0; + } else { + if (!S_ISCHR(stat->mode)) + return 0; + } + if (stat->rdev != dev->devt) + return 0; + + /* ours */ + return 1; +} + +int devtmpfs_delete_node(struct device *dev) +{ + const char *tmp = NULL; + const char *nodename; + struct nameidata nd; + struct dentry *dentry; + struct kstat stat; + int deleted = 1; + int err; + + if (!dev_mnt) + return 0; + + nodename = device_get_nodename(dev, &tmp); + if (!nodename) + return -ENOMEM; + + err = vfs_path_lookup(dev_mnt->mnt_root, dev_mnt, + nodename, LOOKUP_PARENT, &nd); + if (err) + goto out_name; + + mutex_lock_nested(&nd.path.dentry->d_inode->i_mutex, I_MUTEX_PARENT); + dentry = lookup_one_len(nd.last.name, nd.path.dentry, nd.last.len); + if (!IS_ERR(dentry)) { + if (dentry->d_inode) { + err = vfs_getattr(nd.path.mnt, dentry, &stat); + if (!err && dev_mynode(dev, dentry->d_inode, &stat)) { + err = vfs_unlink(nd.path.dentry->d_inode, + dentry); + if (!err || err == -ENOENT) + deleted = 1; + } + } else { + err = -ENOENT; + } + dput(dentry); + } else { + err = PTR_ERR(dentry); + } + mutex_unlock(&nd.path.dentry->d_inode->i_mutex); + + path_put(&nd.path); + if (deleted && strchr(nodename, '/')) + delete_path(nodename); +out_name: + kfree(tmp); + return err; +} + +/* After the root filesystem is mounted by the kernel at /root, or the + * initramfs in extracted at /root, this tmpfs will be mounted at /root/dev. + */ +int devtmpfs_mount(const char *mountpoint) +{ + struct path path; + int err; + + if (!dev_mnt) + return 0; + + err = kern_path(mountpoint, LOOKUP_FOLLOW, &path); + if (err) + return err; + err = do_add_mount(dev_mnt, &path, 0, NULL); + if (err) + printk(KERN_INFO "devtmpfs: error mounting %i\n", err); + else + printk(KERN_INFO "devtmpfs: mounted\n"); + path_put(&path); + return err; +} + +/* + * Create tmpfs mount, created core devices will add their device device + * nodes here. + */ +__init int devtmpfs_init(void) +{ + int err; + + dev_mnt = do_kern_mount("tmpfs", 0, "devtmpfs", NULL); + if (IS_ERR(dev_mnt)) { + err = PTR_ERR(dev_mnt); + printk(KERN_ERR "devtmpfs: unable to initialize %i\n", err); + dev_mnt = NULL; + return -1; + } + + /* create common files/directories */ + dev_mkdir("pts", 0755); + dev_mkdir("shm", 01755); + dev_symlink("/proc/self/fd", "fd"); + dev_symlink("/proc/self/fd/0", "stdin"); + dev_symlink("/proc/self/fd/1", "stdout"); + dev_symlink("/proc/self/fd/2", "stderr"); + printk(KERN_INFO "devtmpfs: initialized\n"); + return 0; +} --- a/drivers/base/init.c +++ b/drivers/base/init.c @@ -20,6 +20,7 @@ void __init driver_init(void) { /* These are the core pieces */ + devtmpfs_init(); devices_init(); buses_init(); classes_init(); --- a/drivers/base/Kconfig +++ b/drivers/base/Kconfig @@ -8,6 +8,23 @@ config UEVENT_HELPER_PATH Path to uevent helper program forked by the kernel for every uevent. +config DEVTMPFS + bool "Create a kernel maintained /dev tmpfs (EXPERIMENTAL)" + depends on HOTPLUG + help + This creates a tmpfs filesystem, and mounts it at bootup + and mounts it at /dev. The kernel driver core creates device + nodes for all registered devices in that filesystem. All device + nodes are owned by root and have the default mode of 0600. + Userspace can add and delete the nodes as needed. This is + intended to simplify bootup, and make it possible to delay + the initial coldplug at bootup done by udev in userspace. + It should also provide a simpler way for rescue systems + to bring up a kernel with dynamic major/minor numbers. + Meaningful symlinks, permissions and device ownership must + still be handled by userspace. + If unsure, say N here. + config STANDALONE bool "Select only drivers that don't need compile-time external firmware" if EXPERIMENTAL default y --- a/drivers/base/Makefile +++ b/drivers/base/Makefile @@ -4,6 +4,7 @@ obj-y := core.o sys.o bus.o dd.o \ driver.o class.o platform.o \ cpu.o firmware.o init.o map.o devres.o \ attribute_container.o transport_class.o +obj-$(CONFIG_DEVTMPFS) += devtmpfs.o obj-y += power/ obj-$(CONFIG_HAS_DMA) += dma-mapping.o obj-$(CONFIG_ISA) += isa.o --- a/include/linux/device.h +++ b/include/linux/device.h @@ -554,6 +554,16 @@ extern void put_device(struct device *de extern void wait_for_device_probe(void); +#ifdef CONFIG_DEVTMPFS +extern int devtmpfs_create_node(struct device *dev); +extern int devtmpfs_delete_node(struct device *dev); +extern int devtmpfs_mount(const char *mountpoint); +#else +static inline int devtmpfs_create_node(struct device *dev) { return 0; } +static inline int devtmpfs_delete_node(struct device *dev) { return 0; } +static inline int devtmpfs_mount(const char *mountpoint) { return 0; } +#endif + /* drivers/base/power/shutdown.c */ extern void device_shutdown(void); --- a/include/linux/shmem_fs.h +++ b/include/linux/shmem_fs.h @@ -42,6 +42,8 @@ static inline struct shmem_inode_info *S return container_of(inode, struct shmem_inode_info, vfs_inode); } +extern int init_tmpfs(void); + #ifdef CONFIG_TMPFS_POSIX_ACL int shmem_permission(struct inode *, int); int shmem_acl_init(struct inode *, struct inode *); --- a/init/do_mounts.c +++ b/init/do_mounts.c @@ -414,7 +414,7 @@ void __init prepare_namespace(void) mount_root(); out: + devtmpfs_mount("dev"); sys_mount(".", "/", NULL, MS_MOVE, NULL); sys_chroot("."); } - --- a/init/initramfs.c +++ b/init/initramfs.c @@ -8,6 +8,7 @@ #include #include #include +#include static __initdata char *message; static void __init error(char *x) @@ -600,6 +601,7 @@ static int __init populate_rootfs(void) initrd_end - initrd_start); if (err) printk(KERN_EMERG "Initramfs unpacking failed: %s\n", err); + devtmpfs_mount("dev"); free_initrd(); #endif } --- a/init/main.c +++ b/init/main.c @@ -64,6 +64,7 @@ #include #include #include +#include #include #include @@ -778,6 +779,7 @@ static void __init do_basic_setup(void) init_workqueues(); cpuset_init_smp(); usermodehelper_init(); + init_tmpfs(); driver_init(); init_irq_proc(); do_initcalls(); --- a/mm/shmem.c +++ b/mm/shmem.c @@ -2523,7 +2523,7 @@ static struct file_system_type tmpfs_fs_ .kill_sb = kill_litter_super, }; -static int __init init_tmpfs(void) +int __init init_tmpfs(void) { int error; @@ -2580,7 +2580,7 @@ static struct file_system_type tmpfs_fs_ .kill_sb = kill_litter_super, }; -static int __init init_tmpfs(void) +int __init init_tmpfs(void) { BUG_ON(register_filesystem(&tmpfs_fs_type) != 0); @@ -2691,5 +2691,3 @@ int shmem_zero_setup(struct vm_area_stru vma->vm_ops = &shmem_vm_ops; return 0; } - -module_init(init_tmpfs) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/