Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 369 insertions, 0 deletions

diff --git a/lib/kobject_uevent.c b/lib/kobject_uevent.c
new file mode 100644
index 000000000000..2a4e7671eaf4
--- /dev/null
+++ b/lib/kobject_uevent.c
@@ -0,0 +1,369 @@
+/*
+ * kernel userspace event delivery
+ *
+ * Copyright (C) 2004 Red Hat, Inc.  All rights reserved.
+ * Copyright (C) 2004 Novell, Inc.  All rights reserved.
+ * Copyright (C) 2004 IBM, Inc. All rights reserved.
+ *
+ * Licensed under the GNU GPL v2.
+ *
+ * Authors:
+ *      Robert Love             <rml@novell.com>
+ *      Kay Sievers             <kay.sievers@vrfy.org>
+ *      Arjan van de Ven        <arjanv@redhat.com>
+ *      Greg Kroah-Hartman      <greg@kroah.com>
+ */
+
+#include <linux/spinlock.h>
+#include <linux/socket.h>
+#include <linux/skbuff.h>
+#include <linux/netlink.h>
+#include <linux/string.h>
+#include <linux/kobject_uevent.h>
+#include <linux/kobject.h>
+#include <net/sock.h>
+
+#define BUFFER_SIZE     1024    /* buffer for the hotplug env */
+#define NUM_ENVP        32      /* number of env pointers */
+
+#if defined(CONFIG_KOBJECT_UEVENT) || defined(CONFIG_HOTPLUG)
+static char *action_to_string(enum kobject_action action)
+{
+        switch (action) {
+        case KOBJ_ADD:
+                return "add";
+        case KOBJ_REMOVE:
+                return "remove";
+        case KOBJ_CHANGE:
+                return "change";
+        case KOBJ_MOUNT:
+                return "mount";
+        case KOBJ_UMOUNT:
+                return "umount";
+        case KOBJ_OFFLINE:
+                return "offline";
+        case KOBJ_ONLINE:
+                return "online";
+        default:
+                return NULL;
+        }
+}
+#endif
+
+#ifdef CONFIG_KOBJECT_UEVENT
+static struct sock *uevent_sock;
+
+/**
+ * send_uevent - notify userspace by sending event trough 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, int 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]);
+                }
+        }
+
+        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, int 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, NULL);
+
+        if (!uevent_sock) {
+                printk(KERN_ERR
+                       "kobject_uevent: unable to create netlink socket!\n");
+                return -ENODEV;
+        }
+
+        return 0;
+}
+
+postcore_initcall(kobject_uevent_init);
+
+#else
+static inline int send_uevent(const char *signal, const char *obj,
+                              char **envp, int gfp_mask)
+{
+        return 0;
+}
+
+#endif /* CONFIG_KOBJECT_UEVENT */
+
+
+#ifdef CONFIG_HOTPLUG
+char hotplug_path[HOTPLUG_PATH_LEN] = "/sbin/hotplug";
+u64 hotplug_seqnum;
+static DEFINE_SPINLOCK(sequence_lock);
+
+/**
+ * kobject_hotplug - notify userspace by executing /sbin/hotplug
+ *
+ * @action: action that is happening (usually "ADD" or "REMOVE")
+ * @kobj: struct kobject that the action is happening to
+ */
+void kobject_hotplug(struct kobject *kobj, enum kobject_action action)
+{
+        char *argv [3];
+        char **envp = NULL;
+        char *buffer = NULL;
+        char *seq_buff;
+        char *scratch;
+        int i = 0;
+        int retval;
+        char *kobj_path = NULL;
+        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__);
+
+        action_string = action_to_string(action);
+        if (!action_string)
+                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 (hotplug_ops->name)
+                name = 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_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;
+
+        envp [i++] = scratch;
+        scratch += sprintf(scratch, "SUBSYSTEM=%s", name) + 1;
+
+        /* reserve space for the sequence,
+         * put the real one in after the hotplug call */
+        envp[i++] = seq_buff = scratch;
+        scratch += strlen("SEQNUM=18446744073709551616") + 1;
+
+        if (hotplug_ops->hotplug) {
+                /* have the kset specific function add its stuff */
+                retval = 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;
+                }
+        }
+
+        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);
+
+        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);
+
+/**
+ * add_hotplug_env_var - helper for creating hotplug environment variables
+ * @envp: Pointer to table of environment variables, as passed into
+ * hotplug() method.
+ * @num_envp: Number of environment variable slots available, as
+ * passed into hotplug() method.
+ * @cur_index: Pointer to current index into @envp.  It should be
+ * initialized to 0 before the first call to add_hotplug_env_var(),
+ * and will be incremented on success.
+ * @buffer: Pointer to buffer for environment variables, as passed
+ * into hotplug() method.
+ * @buffer_size: Length of @buffer, as passed into hotplug() method.
+ * @cur_len: Pointer to current length of space used in @buffer.
+ * Should be initialized to 0 before the first call to
+ * add_hotplug_env_var(), and will be incremented on success.
+ * @format: Format for creating environment variable (of the form
+ * "XXX=%x") for snprintf().
+ *
+ * Returns 0 if environment variable was added successfully or -ENOMEM
+ * if no space was available.
+ */
+int add_hotplug_env_var(char **envp, int num_envp, int *cur_index,
+                        char *buffer, int buffer_size, int *cur_len,
+                        const char *format, ...)
+{
+        va_list args;
+
+        /*
+         * We check against num_envp - 1 to make sure there is at
+         * least one slot left after we return, since the hotplug
+         * method needs to set the last slot to NULL.
+         */
+        if (*cur_index >= num_envp - 1)
+                return -ENOMEM;
+
+        envp[*cur_index] = buffer + *cur_len;
+
+        va_start(args, format);
+        *cur_len += vsnprintf(envp[*cur_index],
+                              max(buffer_size - *cur_len, 0),
+                              format, args) + 1;
+        va_end(args);
+
+        if (*cur_len > buffer_size)
+                return -ENOMEM;
+
+        (*cur_index)++;
+        return 0;
+}
+EXPORT_SYMBOL(add_hotplug_env_var);
+
+#endif /* CONFIG_HOTPLUG */