diff options
| -rw-r--r-- | drivers/scsi/ipr.c | 2 | ||||
| -rw-r--r-- | include/linux/kobject.h | 27 | ||||
| -rw-r--r-- | lib/kobject_uevent.c | 279 |
3 files changed, 102 insertions, 206 deletions
diff --git a/drivers/scsi/ipr.c b/drivers/scsi/ipr.c index fa2cb3582cfa..bf44a409ba0d 100644 --- a/drivers/scsi/ipr.c +++ b/drivers/scsi/ipr.c @@ -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; } diff --git a/include/linux/kobject.h b/include/linux/kobject.h index e6926b327538..5b08248fba72 100644 --- a/include/linux/kobject.h +++ b/include/linux/kobject.h @@ -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__ */ diff --git a/lib/kobject_uevent.c b/lib/kobject_uevent.c index 845bf67d94ca..dd061da3aba9 100644 --- a/lib/kobject_uevent.c +++ b/lib/kobject_uevent.c @@ -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. */ + pr_debug("%s\n", __FUNCTION__); + + action_string = action_to_string(action); + if (!action_string) + return; + + /* 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) - kset = top_kobj->kset; - else + if (!top_kobj->kset) return; - if (kset->hotplug_ops) - hotplug_ops = kset->hotplug_ops; + kset = top_kobj->kset; + 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) { + /* skip the event, if the filter returns zero. */ + if (hotplug_ops && hotplug_ops->filter) if (!hotplug_ops->filter(kset, kobj)) return; - } - - pr_debug ("%s\n", __FUNCTION__); - - action_string = action_to_string(action); - if (!action_string) - return; - envp = kmalloc(NUM_ENVP * sizeof (char *), GFP_KERNEL); + /* 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); + /* complete object path */ + devpath = kobject_get_path(kobj, GFP_KERNEL); + if (!devpath) + goto exit; - argv [0] = hotplug_path; - argv [1] = (char *)name; /* won't be changed but 'const' has to go */ - argv [2] = NULL; + /* originating subsystem */ + if (hotplug_ops && hotplug_ops->name) + subsystem = hotplug_ops->name(kset, kobj); + else + subsystem = kobject_name(&kset->kobj); - /* minimal command environment */ - envp [i++] = "HOME=/"; - envp [i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin"; + /* event environemnt for helper process only */ + envp[i++] = "HOME=/"; + envp[i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin"; + /* default keys */ scratch = buffer; - envp [i++] = scratch; scratch += sprintf(scratch, "ACTION=%s", action_string) + 1; - - kobj_path = kobject_get_path(kobj, GFP_KERNEL); - if (!kobj_path) - goto exit; - envp [i++] = scratch; - scratch += sprintf (scratch, "DEVPATH=%s", kobj_path) + 1; - + scratch += sprintf (scratch, "DEVPATH=%s", devpath) + 1; envp [i++] = scratch; - scratch += sprintf(scratch, "SUBSYSTEM=%s", name) + 1; + scratch += sprintf(scratch, "SUBSYSTEM=%s", subsystem) + 1; - /* reserve space for the sequence, - * put the real one in after the hotplug call */ + /* 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_uevent(action_string, kobj_path, envp, GFP_KERNEL); + /* send netlink message */ + if (uevent_sock) { + struct sk_buff *skb; + size_t len; + + /* 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); + + /* 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]); + } + + NETLINK_CB(skb).dst_group = 1; + netlink_broadcast(uevent_sock, skb, 0, 1, GFP_KERNEL); + } + } - if (!hotplug_path[0]) - goto exit; + /* call uevent_helper, usually only enabled during early boot */ + if (hotplug_path[0]) { + char *argv [3]; - retval = call_usermodehelper (argv[0], argv, envp, 0); - if (retval) - pr_debug ("%s - call_usermodehelper returned %d\n", - __FUNCTION__, retval); + 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 */ |