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[PATCH] merge kobject_uevent and kobject_hotplug

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The distinction between hotplug and uevent does not make sense these
days, netlink events are the default.

udev depends entirely on netlink uevents. Only during early boot and
in initramfs, /sbin/hotplug is needed. So merge the two functions and
provide only one interface without all the options.

The netlink layer got a nice generic interface with named slots
recently, which is probably a better facility to plug events for
subsystem specific events.
Also the new poll() interface to /proc/mounts is a nicer way to
notify about changes than sending events through the core.
The uevents should only be used for driver core related requests to
userspace now.

Signed-off-by: Kay Sievers <kay.sievers@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Kay Sievers 2005-11-11 14:43:07 +01:00 committed by Greg Kroah-Hartman
parent 033b96fd30
commit 5f123fbd80
3 changed files with 112 additions and 216 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
drivers/scsi/ipr.c
View file

@ -2132,7 +2132,7 @@ restart:
}
spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
kobject_uevent(&ioa_cfg->host->shost_classdev.kobj, KOBJ_CHANGE, NULL);
kobject_hotplug(&ioa_cfg->host->shost_classdev.kobj, KOBJ_CHANGE);
LEAVE;
}

27
include/linux/kobject.h
View file

@ -39,11 +39,11 @@ extern u64 hotplug_seqnum;
/* the actions here must match the proper string in lib/kobject_uevent.c */
typedef int __bitwise kobject_action_t;
enum kobject_action {
KOBJ_ADD = (__force kobject_action_t) 0x01, /* add event, for hotplug */
KOBJ_REMOVE = (__force kobject_action_t) 0x02, /* remove event, for hotplug */
KOBJ_CHANGE = (__force kobject_action_t) 0x03, /* a sysfs attribute file has changed */
KOBJ_OFFLINE = (__force kobject_action_t) 0x04, /* offline event for hotplug devices */
KOBJ_ONLINE = (__force kobject_action_t) 0x05, /* online event for hotplug devices */
KOBJ_ADD = (__force kobject_action_t) 0x01, /* exclusive to core */
KOBJ_REMOVE = (__force kobject_action_t) 0x02, /* exclusive to core */
KOBJ_CHANGE = (__force kobject_action_t) 0x03, /* device state change */
KOBJ_OFFLINE = (__force kobject_action_t) 0x04, /* device offline */
KOBJ_ONLINE = (__force kobject_action_t) 0x05, /* device online */
};
struct kobject {
@ -262,28 +262,13 @@ int add_hotplug_env_var(char **envp, int num_envp, int *cur_index,
char *buffer, int buffer_size, int *cur_len,
const char *format, ...)
__attribute__((format (printf, 7, 8)));
int kobject_uevent(struct kobject *kobj,
enum kobject_action action,
struct attribute *attr);
int kobject_uevent_atomic(struct kobject *kobj,
enum kobject_action action,
struct attribute *attr);
#else
static inline void kobject_hotplug(struct kobject *kobj, enum kobject_action action) { }
static inline int add_hotplug_env_var(char **envp, int num_envp, int *cur_index,
char *buffer, int buffer_size, int *cur_len,
const char *format, ...)
{ return 0; }
int kobject_uevent(struct kobject *kobj,
enum kobject_action action,
struct attribute *attr)
{ return 0; }
int kobject_uevent_atomic(struct kobject *kobj,
enum kobject_action action,
struct attribute *attr)
{ return 0; }
#endif
#endif /* __KERNEL__ */

299
lib/kobject_uevent.c
View file

@ -29,6 +29,7 @@
char hotplug_path[HOTPLUG_PATH_LEN] = "/sbin/hotplug";
u64 hotplug_seqnum;
static DEFINE_SPINLOCK(sequence_lock);
static struct sock *uevent_sock;
static char *action_to_string(enum kobject_action action)
{
@ -48,123 +49,6 @@ static char *action_to_string(enum kobject_action action)
}
}
static struct sock *uevent_sock;
/**
* send_uevent - notify userspace by sending event through netlink socket
*
* @signal: signal name
* @obj: object path (kobject)
* @envp: possible hotplug environment to pass with the message
* @gfp_mask:
*/
static int send_uevent(const char *signal, const char *obj,
char **envp, gfp_t gfp_mask)
{
struct sk_buff *skb;
char *pos;
int len;
if (!uevent_sock)
return -EIO;
len = strlen(signal) + 1;
len += strlen(obj) + 1;
/* allocate buffer with the maximum possible message size */
skb = alloc_skb(len + BUFFER_SIZE, gfp_mask);
if (!skb)
return -ENOMEM;
pos = skb_put(skb, len);
sprintf(pos, "%s@%s", signal, obj);
/* copy the environment key by key to our continuous buffer */
if (envp) {
int i;
for (i = 2; envp[i]; i++) {
len = strlen(envp[i]) + 1;
pos = skb_put(skb, len);
strcpy(pos, envp[i]);
}
}
NETLINK_CB(skb).dst_group = 1;
return netlink_broadcast(uevent_sock, skb, 0, 1, gfp_mask);
}
static int do_kobject_uevent(struct kobject *kobj, enum kobject_action action,
struct attribute *attr, gfp_t gfp_mask)
{
char *path;
char *attrpath;
char *signal;
int len;
int rc = -ENOMEM;
path = kobject_get_path(kobj, gfp_mask);
if (!path)
return -ENOMEM;
signal = action_to_string(action);
if (!signal)
return -EINVAL;
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, gfp_mask);
kfree(attrpath);
} else
rc = send_uevent(signal, path, NULL, gfp_mask);
exit:
kfree(path);
return rc;
}
/**
* kobject_uevent - notify userspace by sending event through netlink socket
*
* @signal: signal name
* @kobj: struct kobject that the event is happening to
* @attr: optional struct attribute the event belongs to
*/
int kobject_uevent(struct kobject *kobj, enum kobject_action action,
struct attribute *attr)
{
return do_kobject_uevent(kobj, action, attr, GFP_KERNEL);
}
EXPORT_SYMBOL_GPL(kobject_uevent);
int kobject_uevent_atomic(struct kobject *kobj, enum kobject_action action,
struct attribute *attr)
{
return do_kobject_uevent(kobj, action, attr, GFP_ATOMIC);
}
EXPORT_SYMBOL_GPL(kobject_uevent_atomic);
static int __init kobject_uevent_init(void)
{
uevent_sock = netlink_kernel_create(NETLINK_KOBJECT_UEVENT, 1, NULL,
THIS_MODULE);
if (!uevent_sock) {
printk(KERN_ERR
"kobject_uevent: unable to create netlink socket!\n");
return -ENODEV;
}
return 0;
}
postcore_initcall(kobject_uevent_init);
/**
* kobject_hotplug - notify userspace by executing /sbin/hotplug
*
@ -173,95 +57,84 @@ postcore_initcall(kobject_uevent_init);
*/
void kobject_hotplug(struct kobject *kobj, enum kobject_action action)
{
char *argv [3];
char **envp = NULL;
char *buffer = NULL;
char *seq_buff;
char **envp;
char *buffer;
char *scratch;
const char *action_string;
const char *devpath = NULL;
const char *subsystem;
struct kobject *top_kobj;
struct kset *kset;
struct kset_hotplug_ops *hotplug_ops;
u64 seq;
char *seq_buff;
int i = 0;
int retval;
char *kobj_path = NULL;
const char *name = NULL;
char *action_string;
u64 seq;
struct kobject *top_kobj = kobj;
struct kset *kset;
static struct kset_hotplug_ops null_hotplug_ops;
struct kset_hotplug_ops *hotplug_ops = &null_hotplug_ops;
/* 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)
kset = top_kobj->kset;
else
return;
if (kset->hotplug_ops)
hotplug_ops = kset->hotplug_ops;
/* If the kset has a filter operation, call it.
Skip the event, if the filter returns zero. */
if (hotplug_ops->filter) {
if (!hotplug_ops->filter(kset, kobj))
return;
}
pr_debug ("%s\n", __FUNCTION__);
pr_debug("%s\n", __FUNCTION__);
action_string = action_to_string(action);
if (!action_string)
return;
envp = kmalloc(NUM_ENVP * sizeof (char *), GFP_KERNEL);
/* search the kset we belong to */
top_kobj = kobj;
if (!top_kobj->kset && top_kobj->parent) {
do {
top_kobj = top_kobj->parent;
} while (!top_kobj->kset && top_kobj->parent);
}
if (!top_kobj->kset)
return;
kset = top_kobj->kset;
hotplug_ops = kset->hotplug_ops;
/* skip the event, if the filter returns zero. */
if (hotplug_ops && hotplug_ops->filter)
if (!hotplug_ops->filter(kset, kobj))
return;
/* environment index */
envp = kzalloc(NUM_ENVP * sizeof (char *), GFP_KERNEL);
if (!envp)
return;
memset (envp, 0x00, NUM_ENVP * sizeof (char *));
/* environment values */
buffer = kmalloc(BUFFER_SIZE, GFP_KERNEL);
if (!buffer)
goto exit;
if (hotplug_ops->name)
name = hotplug_ops->name(kset, kobj);
if (name == NULL)
name = kobject_name(&kset->kobj);
argv [0] = hotplug_path;
argv [1] = (char *)name; /* won't be changed but 'const' has to go */
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_string) + 1;
kobj_path = kobject_get_path(kobj, GFP_KERNEL);
if (!kobj_path)
/* complete object path */
devpath = kobject_get_path(kobj, GFP_KERNEL);
if (!devpath)
goto exit;
envp [i++] = scratch;
scratch += sprintf (scratch, "DEVPATH=%s", kobj_path) + 1;
/* originating subsystem */
if (hotplug_ops && hotplug_ops->name)
subsystem = hotplug_ops->name(kset, kobj);
else
subsystem = kobject_name(&kset->kobj);
envp [i++] = scratch;
scratch += sprintf(scratch, "SUBSYSTEM=%s", name) + 1;
/* event environemnt for helper process only */
envp[i++] = "HOME=/";
envp[i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
/* reserve space for the sequence,
* put the real one in after the hotplug call */
/* default keys */
scratch = buffer;
envp [i++] = scratch;
scratch += sprintf(scratch, "ACTION=%s", action_string) + 1;
envp [i++] = scratch;
scratch += sprintf (scratch, "DEVPATH=%s", devpath) + 1;
envp [i++] = scratch;
scratch += sprintf(scratch, "SUBSYSTEM=%s", subsystem) + 1;
/* just reserve the space, overwrite it after kset call has returned */
envp[i++] = seq_buff = scratch;
scratch += strlen("SEQNUM=18446744073709551616") + 1;
if (hotplug_ops->hotplug) {
/* have the kset specific function add its stuff */
/* let the kset specific function add its stuff */
if (hotplug_ops && hotplug_ops->hotplug) {
retval = hotplug_ops->hotplug (kset, kobj,
&envp[i], NUM_ENVP - i, scratch,
BUFFER_SIZE - (scratch - buffer));
@ -272,27 +145,49 @@ void kobject_hotplug(struct kobject *kobj, enum kobject_action action)
}
}
/* we will send an event, request a new sequence number */
spin_lock(&sequence_lock);
seq = ++hotplug_seqnum;
spin_unlock(&sequence_lock);
sprintf(seq_buff, "SEQNUM=%llu", (unsigned long long)seq);
pr_debug ("%s: %s %s seq=%llu %s %s %s %s %s\n",
__FUNCTION__, argv[0], argv[1], (unsigned long long)seq,
envp[0], envp[1], envp[2], envp[3], envp[4]);
/* send netlink message */
if (uevent_sock) {
struct sk_buff *skb;
size_t len;
send_uevent(action_string, kobj_path, envp, GFP_KERNEL);
/* allocate message with the maximum possible size */
len = strlen(action_string) + strlen(devpath) + 2;
skb = alloc_skb(len + BUFFER_SIZE, GFP_KERNEL);
if (skb) {
/* add header */
scratch = skb_put(skb, len);
sprintf(scratch, "%s@%s", action_string, devpath);
if (!hotplug_path[0])
goto exit;
/* copy keys to our continuous event payload buffer */
for (i = 2; envp[i]; i++) {
len = strlen(envp[i]) + 1;
scratch = skb_put(skb, len);
strcpy(scratch, envp[i]);
}
retval = call_usermodehelper (argv[0], argv, envp, 0);
if (retval)
pr_debug ("%s - call_usermodehelper returned %d\n",
__FUNCTION__, retval);
NETLINK_CB(skb).dst_group = 1;
netlink_broadcast(uevent_sock, skb, 0, 1, GFP_KERNEL);
}
}
/* call uevent_helper, usually only enabled during early boot */
if (hotplug_path[0]) {
char *argv [3];
argv [0] = hotplug_path;
argv [1] = (char *)subsystem;
argv [2] = NULL;
call_usermodehelper (argv[0], argv, envp, 0);
}
exit:
kfree(kobj_path);
kfree(devpath);
kfree(buffer);
kfree(envp);
return;
@ -350,4 +245,20 @@ int add_hotplug_env_var(char **envp, int num_envp, int *cur_index,
}
EXPORT_SYMBOL(add_hotplug_env_var);
static int __init kobject_uevent_init(void)
{
uevent_sock = netlink_kernel_create(NETLINK_KOBJECT_UEVENT, 1, NULL,
THIS_MODULE);
if (!uevent_sock) {
printk(KERN_ERR
"kobject_uevent: unable to create netlink socket!\n");
return -ENODEV;
}
return 0;
}
postcore_initcall(kobject_uevent_init);
#endif /* CONFIG_HOTPLUG */