diff -Nru a/fs/super.c b/fs/super.c --- a/fs/super.c 2004-09-06 03:47:59 +02:00 +++ b/fs/super.c 2004-09-06 03:47:59 +02:00 @@ -35,6 +35,7 @@ #include #include /* for the emergency remount stuff */ #include +#include #include @@ -633,6 +634,16 @@ return (void *)s->s_bdev == data; } +static void bdev_claim_uevent(const char *action, struct block_device *bdev) +{ + if (bdev->bd_disk) { + if (bdev->bd_part) + kobject_uevent(action, &bdev->bd_part->kobj, NULL); + else + kobject_uevent(action, &bdev->bd_disk->kobj, NULL); + } +} + struct super_block *get_sb_bdev(struct file_system_type *fs_type, int flags, const char *dev_name, void *data, int (*fill_super)(struct super_block *, void *, int)) @@ -675,8 +686,10 @@ up_write(&s->s_umount); deactivate_super(s); s = ERR_PTR(error); - } else + } else { s->s_flags |= MS_ACTIVE; + bdev_claim_uevent("claim", bdev); + } } return s; @@ -691,6 +704,8 @@ void kill_block_super(struct super_block *sb) { struct block_device *bdev = sb->s_bdev; + + bdev_claim_uevent("release", bdev); generic_shutdown_super(sb); set_blocksize(bdev, sb->s_old_blocksize); close_bdev_excl(bdev); diff -Nru a/include/linux/kobject.h b/include/linux/kobject.h --- a/include/linux/kobject.h 2004-09-06 03:47:59 +02:00 +++ b/include/linux/kobject.h 2004-09-06 03:47:59 +02:00 @@ -61,7 +61,7 @@ extern void kobject_hotplug(const char *action, struct kobject *); -extern char * kobject_get_path(struct kset *, struct kobject *, int); +extern char * kobject_get_path(struct kobject *, int); struct kobj_type { void (*release)(struct kobject *); diff -Nru a/include/linux/kobject_uevent.h b/include/linux/kobject_uevent.h --- /dev/null Wed Dec 31 16:00:00 196900 +++ b/include/linux/kobject_uevent.h 2004-09-06 03:47:59 +02:00 @@ -0,0 +1,39 @@ +#ifndef _KOBJECT_UEVENT_H_ +#define _KOBJECT_UEVENT_H_ + +#ifdef __KERNEL__ + +#ifdef CONFIG_HOTPLUG +/* counter to tag the hotplug event, read only except for the kobject uevent */ +extern u64 hotplug_seqnum; +extern void kobject_hotplug(const char *action, struct kobject *kobj); +#else +static inline void kobject_hotplug(const char *action, struct kobject *kobj) +{ + return; +} +#endif + + +#ifdef CONFIG_KOBJECT_UEVENT +extern int kobject_uevent(const char *signal, struct kobject *kobj, + struct attribute *attr); + +extern int kobject_uevent_atomic(const char *signal, struct kobject *kobj, + struct attribute *attr); +#else +static inline int kobject_uevent(const char *signal, struct kobject *kobj, + struct attribute *attr) +{ + return 0; +} + +static inline int kobject_uevent_atomic(const char *signal, struct kobject *kobj, + struct attribute *attr) +{ + return 0; +} +#endif + +#endif /* __KERNEL__ */ +#endif /* _KOBJECT_UEVENT_H_ */ diff -Nru a/include/linux/netlink.h b/include/linux/netlink.h --- a/include/linux/netlink.h 2004-09-06 03:47:59 +02:00 +++ b/include/linux/netlink.h 2004-09-06 03:47:59 +02:00 @@ -17,6 +17,7 @@ #define NETLINK_ROUTE6 11 /* af_inet6 route comm channel */ #define NETLINK_IP6_FW 13 #define NETLINK_DNRTMSG 14 /* DECnet routing messages */ +#define NETLINK_KOBJECT_UEVENT 15 /* Kernel messages to userspace */ #define NETLINK_TAPBASE 16 /* 16 to 31 are ethertap */ #define MAX_LINKS 32 diff -Nru a/init/Kconfig b/init/Kconfig --- a/init/Kconfig 2004-09-06 03:47:59 +02:00 +++ b/init/Kconfig 2004-09-06 03:47:59 +02:00 @@ -195,6 +195,22 @@ agent" (/sbin/hotplug) to load modules and set up software needed to use devices as you hotplug them. +config KOBJECT_UEVENT + bool "Kernel Userspace Events" + depends on NET && HOTPLUG + default y + help + This option enables the kernel userspace events layer, which is a + simple mechanism for kernel-to-user communication over a netlink + socket. + The goal of the kernel userspace events layer is to provide a simple + and efficient events system, that notifies userspace about kobject + state changes e.g. hotplug events, power state transitions or block + device claiming (mount/unmount). + + Say Y, unless you are building a system requiring minimal memory + consumption. + config IKCONFIG bool "Kernel .config support" ---help--- diff -Nru a/kernel/Makefile b/kernel/Makefile --- a/kernel/Makefile 2004-09-06 03:47:59 +02:00 +++ b/kernel/Makefile 2004-09-06 03:47:59 +02:00 @@ -24,6 +24,7 @@ obj-$(CONFIG_AUDIT) += audit.o obj-$(CONFIG_AUDITSYSCALL) += auditsc.o obj-$(CONFIG_KPROBES) += kprobes.o +obj-$(CONFIG_HOTPLUG) += kobject_uevent.o ifneq ($(CONFIG_IA64),y) # According to Alan Modra , the -fno-omit-frame-pointer is diff -Nru a/kernel/kobject_uevent.c b/kernel/kobject_uevent.c --- /dev/null Wed Dec 31 16:00:00 196900 +++ b/kernel/kobject_uevent.c 2004-09-06 03:47:59 +02:00 @@ -0,0 +1,233 @@ +/* + * kernel/kobj_uevent.c - kernel userspace event delivery + * + * Copyright (C) 2004 Red Hat, Inc. All rights reserved. + * Copyright (C) 2004 Novell, Inc. All rights reserved. + * + * Licensed under the GNU GPL v2. + * + * Authors: + * Robert Love + * Kay Sievers + * Arjan van de Ven + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#ifdef CONFIG_HOTPLUG +u64 hotplug_seqnum; +static spinlock_t sequence_lock = SPIN_LOCK_UNLOCKED; +#endif + +#ifdef CONFIG_KOBJECT_UEVENT +static struct sock *uevent_sock = NULL; +#endif + +static int send_uevent(const char *signal, const char *obj, + const void *buf, int buflen, int gfp_mask) +{ + struct sk_buff *skb; + char *pos; + int len; + + if (!uevent_sock) + return -EIO; + + len = strlen(signal) + 1; + len += strlen(obj) + 1; + len += buflen; + + skb = alloc_skb(len, gfp_mask); + if (!skb) + return -ENOMEM; + + pos = skb_put(skb, len); + + pos += sprintf(pos, "%s@%s", signal, obj) + 1; + memcpy(pos, buf, buflen); + + return netlink_broadcast(uevent_sock, skb, 0, 1, gfp_mask); +} + +static int do_kobject_uevent(const char *signal, struct kobject *kobj, + struct attribute *attr, int gfp_mask) +{ + char *path; + char *attrpath; + int len; + int rc = -ENOMEM; + + path = kobject_get_path(kobj, gfp_mask); + if (!path) + return -ENOMEM; + + if (attr) { + len = strlen(path); + len += strlen(attr->name) + 2; + attrpath = kmalloc(len, gfp_mask); + if (!attrpath) + goto exit; + sprintf(attrpath, "%s/%s", path, attr->name); + rc = send_uevent(signal, attrpath, NULL, 0, gfp_mask); + kfree(attrpath); + } else { + rc = send_uevent(signal, path, NULL, 0, gfp_mask); + } + +exit: + kfree(path); + return rc; +} + +int kobject_uevent(const char *signal, struct kobject *kobj, + struct attribute *attr) +{ + return do_kobject_uevent(signal, kobj, attr, GFP_KERNEL); +} + +EXPORT_SYMBOL(kobject_uevent); + +int kobject_uevent_atomic(const char *signal, struct kobject *kobj, + struct attribute *attr) +{ + return do_kobject_uevent(signal, kobj, attr, GFP_ATOMIC); +} + +EXPORT_SYMBOL(kobject_uevent_atomic); + + +#define BUFFER_SIZE 1024 /* should be enough memory for the env */ +#define NUM_ENVP 32 /* number of env pointers */ +void kobject_hotplug(const char *action, struct kobject *kobj) +{ + char *argv [3]; + char **envp = NULL; + char *buffer = NULL; + char *scratch; + int i = 0; + int retval; + char *kobj_path = NULL; + char *name = NULL; + u64 seq; + struct kobject * top_kobj = kobj; + struct kset * kset; + + if (!top_kobj->kset && top_kobj->parent) { + do { + top_kobj = top_kobj->parent; + } while (!top_kobj->kset && top_kobj->parent); + } + + if (top_kobj->kset && top_kobj->kset->hotplug_ops) + kset = top_kobj->kset; + else + return; + + /* If the kset has a filter operation, call it. + Skip the event, if the filter returns zero. */ + if (kset->hotplug_ops->filter) { + if (!kset->hotplug_ops->filter(kset, kobj)) + return; + } + + pr_debug ("%s\n", __FUNCTION__); + + envp = kmalloc(NUM_ENVP * sizeof (char *), GFP_KERNEL); + if (!envp) + return; + memset (envp, 0x00, NUM_ENVP * sizeof (char *)); + + buffer = kmalloc(BUFFER_SIZE, GFP_KERNEL); + if (!buffer) + goto exit; + + if (kset->hotplug_ops->name) + name = kset->hotplug_ops->name(kset, kobj); + if (name == NULL) + name = kset->kobj.name; + + argv [0] = hotplug_path; + argv [1] = name; + argv [2] = NULL; + + /* minimal command environment */ + envp [i++] = "HOME=/"; + envp [i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin"; + + scratch = buffer; + + envp [i++] = scratch; + scratch += sprintf(scratch, "ACTION=%s", action) + 1; + + spin_lock(&sequence_lock); + seq = ++hotplug_seqnum; + spin_unlock(&sequence_lock); + + kobj_path = kobject_get_path(kobj, GFP_KERNEL); + if (!kobj_path) + goto exit; + + envp [i++] = scratch; + scratch += sprintf (scratch, "DEVPATH=%s", kobj_path) + 1; + + envp [i++] = scratch; + scratch += sprintf(scratch, "SEQNUM=%lld", seq) + 1; + + envp [i++] = scratch; + scratch += sprintf(scratch, "SUBSYSTEM=%s", name) + 1; + + if (kset->hotplug_ops->hotplug) { + /* have the kset specific function add its stuff */ + retval = kset->hotplug_ops->hotplug (kset, kobj, + &envp[i], NUM_ENVP - i, scratch, + BUFFER_SIZE - (scratch - buffer)); + if (retval) { + pr_debug ("%s - hotplug() returned %d\n", + __FUNCTION__, retval); + goto exit; + } + } + + pr_debug ("%s: %s %s %s %s %s %s %s\n", __FUNCTION__, argv[0], argv[1], + envp[0], envp[1], envp[2], envp[3], envp[4]); + + send_uevent(action, kobj_path, buffer, scratch - buffer, GFP_KERNEL); + + if (!hotplug_path[0]) + goto exit; + + retval = call_usermodehelper (argv[0], argv, envp, 0); + if (retval) + pr_debug ("%s - call_usermodehelper returned %d\n", + __FUNCTION__, retval); + +exit: + kfree(kobj_path); + kfree(buffer); + kfree(envp); + return; +} + +EXPORT_SYMBOL(kobject_hotplug); + +static int __init kobject_uevent_init(void) +{ + uevent_sock = netlink_kernel_create(NETLINK_KOBJECT_UEVENT, NULL); + + if (!uevent_sock) { + printk(KERN_ERR + "kobject_uevent: unable to create netlink socket!\n"); + return -ENODEV; + } + + return 0; +} + +core_initcall(kobject_uevent_init); diff -Nru a/lib/kobject.c b/lib/kobject.c --- a/lib/kobject.c 2004-09-06 03:47:59 +02:00 +++ b/lib/kobject.c 2004-09-06 03:47:59 +02:00 @@ -13,6 +13,7 @@ #undef DEBUG #include +#include #include #include #include @@ -63,7 +64,7 @@ return container_of(entry,struct kobject,entry); } -static int get_kobj_path_length(struct kset *kset, struct kobject *kobj) +static int get_kobj_path_length(struct kobject *kobj) { int length = 1; struct kobject * parent = kobj; @@ -79,7 +80,7 @@ return length; } -static void fill_kobj_path(struct kset *kset, struct kobject *kobj, char *path, int length) +static void fill_kobj_path(struct kobject *kobj, char *path, int length) { struct kobject * parent; @@ -103,146 +104,21 @@ * @kobj: kobject in question, with which to build the path * @gfp_mask: the allocation type used to allocate the path */ -char * kobject_get_path(struct kset *kset, struct kobject *kobj, int gfp_mask) +char * kobject_get_path(struct kobject *kobj, int gfp_mask) { char *path; int len; - len = get_kobj_path_length(kset, kobj); + len = get_kobj_path_length(kobj); path = kmalloc(len, gfp_mask); if (!path) return NULL; memset(path, 0x00, len); - fill_kobj_path(kset, kobj, path, len); + fill_kobj_path(kobj, path, len); return path; } -#ifdef CONFIG_HOTPLUG - -#define BUFFER_SIZE 1024 /* should be enough memory for the env */ -#define NUM_ENVP 32 /* number of env pointers */ -static unsigned long sequence_num; -static spinlock_t sequence_lock = SPIN_LOCK_UNLOCKED; - -static void kset_hotplug(const char *action, struct kset *kset, - struct kobject *kobj) -{ - char *argv [3]; - char **envp = NULL; - char *buffer = NULL; - char *scratch; - int i = 0; - int retval; - char *kobj_path = NULL; - char *name = NULL; - unsigned long seq; - - /* If the kset has a filter operation, call it. If it returns - failure, no hotplug event is required. */ - if (kset->hotplug_ops->filter) { - if (!kset->hotplug_ops->filter(kset, kobj)) - return; - } - - pr_debug ("%s\n", __FUNCTION__); - - if (!hotplug_path[0]) - return; - - envp = kmalloc(NUM_ENVP * sizeof (char *), GFP_KERNEL); - if (!envp) - return; - memset (envp, 0x00, NUM_ENVP * sizeof (char *)); - - buffer = kmalloc(BUFFER_SIZE, GFP_KERNEL); - if (!buffer) - goto exit; - - if (kset->hotplug_ops->name) - name = kset->hotplug_ops->name(kset, kobj); - if (name == NULL) - name = kset->kobj.name; - - argv [0] = hotplug_path; - argv [1] = name; - argv [2] = NULL; - - /* minimal command environment */ - envp [i++] = "HOME=/"; - envp [i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin"; - - scratch = buffer; - - envp [i++] = scratch; - scratch += sprintf(scratch, "ACTION=%s", action) + 1; - - spin_lock(&sequence_lock); - seq = sequence_num++; - spin_unlock(&sequence_lock); - - envp [i++] = scratch; - scratch += sprintf(scratch, "SEQNUM=%ld", seq) + 1; - - kobj_path = kobject_get_path(kset, kobj, GFP_KERNEL); - if (!kobj_path) - goto exit; - - envp [i++] = scratch; - scratch += sprintf (scratch, "DEVPATH=%s", kobj_path) + 1; - - if (kset->hotplug_ops->hotplug) { - /* have the kset specific function add its stuff */ - retval = kset->hotplug_ops->hotplug (kset, kobj, - &envp[i], NUM_ENVP - i, scratch, - BUFFER_SIZE - (scratch - buffer)); - if (retval) { - pr_debug ("%s - hotplug() returned %d\n", - __FUNCTION__, retval); - goto exit; - } - } - - pr_debug ("%s: %s %s %s %s %s %s %s\n", __FUNCTION__, argv[0], argv[1], - envp[0], envp[1], envp[2], envp[3], envp[4]); - retval = call_usermodehelper (argv[0], argv, envp, 0); - if (retval) - pr_debug ("%s - call_usermodehelper returned %d\n", - __FUNCTION__, retval); - -exit: - kfree(kobj_path); - kfree(buffer); - kfree(envp); - return; -} - -void kobject_hotplug(const char *action, struct kobject *kobj) -{ - struct kobject * top_kobj = kobj; - - /* If this kobj does not belong to a kset, - try to find a parent that does. */ - if (!top_kobj->kset && top_kobj->parent) { - do { - top_kobj = top_kobj->parent; - } while (!top_kobj->kset && top_kobj->parent); - } - - if (top_kobj->kset && top_kobj->kset->hotplug_ops) - kset_hotplug(action, top_kobj->kset, kobj); -} -#else -void kobject_hotplug(const char *action, struct kobject *kobj) -{ - return; -} -#endif /* CONFIG_HOTPLUG */ - -/** - * kobject_init - initialize object. - * @kobj: object in question. - */ void kobject_init(struct kobject * kobj) { kref_init(&kobj->kref); @@ -654,7 +530,6 @@ EXPORT_SYMBOL(kobject_add); EXPORT_SYMBOL(kobject_del); EXPORT_SYMBOL(kobject_rename); -EXPORT_SYMBOL(kobject_hotplug); EXPORT_SYMBOL(kset_register); EXPORT_SYMBOL(kset_unregister);