How do I remove all references to an object in sysfs? The following patch
attempt to get that functionality in sysfs but I am not that familiar with
it. Help....
SLUB: Remove alias before installing symlink
We cannot really track the aliases that are created when aliasing
a slab. kmem_cache_destroy only decrements a refcounter. This
means that the aliases are never removed. However, when the last
ref count to a slab is dropped then we should remove all symlinks.
Signed-off-by: Chriustoph Lameter <[email protected]>
Index: linux-2.6.21-rc6/mm/slub.c
===================================================================
--- linux-2.6.21-rc6.orig/mm/slub.c 2007-04-20 16:44:14.000000000 -0700
+++ linux-2.6.21-rc6/mm/slub.c 2007-04-20 17:12:18.000000000 -0700
@@ -3315,6 +3315,7 @@ static int sysfs_slab_add(struct kmem_ca
/* Defer until later */
return 0;
+ sysfs_remove_link(&slab_subsys.kset.kobj, s->name);
kobj_set_kset_s(s, slab_subsys);
kobject_set_name(&s->kobj, s->name);
kobject_init(&s->kobj);
@@ -3329,8 +3330,18 @@ static int sysfs_slab_add(struct kmem_ca
return 0;
}
+static void sysfs_remove_aliases(struct kmem_cache *s)
+{
+ /*
+ * Remove all symlinks pointing to the kobject of
+ * in the kmem_cache structure
+ */
+ sysfs_remove_links(&slab_subsys.kset, &s->kobj);
+}
+
static void sysfs_slab_remove(struct kmem_cache *s)
{
+ sysfs_remove_aliases(s);
kobject_uevent(&s->kobj, KOBJ_REMOVE);
kobject_del(&s->kobj);
}
@@ -3351,9 +3362,11 @@ static int sysfs_slab_alias(struct kmem_
{
struct saved_alias *al;
- if (slab_state == SYSFS)
+ if (slab_state == SYSFS) {
+ sysfs_remove_link(&slab_subsys.kset.kobj, name);
return sysfs_create_link(&slab_subsys.kset.kobj,
&s->kobj, name);
+ }
al = kmalloc(sizeof(struct saved_alias), GFP_KERNEL);
if (!al)
Index: linux-2.6.21-rc6/fs/sysfs/symlink.c
===================================================================
--- linux-2.6.21-rc6.orig/fs/sysfs/symlink.c 2007-04-20 17:05:00.000000000 -0700
+++ linux-2.6.21-rc6/fs/sysfs/symlink.c 2007-04-20 17:18:50.000000000 -0700
@@ -117,6 +117,38 @@ void sysfs_remove_link(struct kobject *
sysfs_hash_and_remove(kobj->dentry,name);
}
+/*
+ * Remove all symlinks pointing to the indicated object
+ */
+void sysfs_remove_links(struct kset *kset, struct kobject *needle)
+{
+ struct list_head *entry;
+
+restart:
+ spin_lock(&kset->list_lock);
+ list_for_each(entry,&kset->list) {
+ struct kobject * k = container_of(entry, struct kobject, entry);
+ struct sysfs_symlink *sl =
+ container_of(k, struct sysfs_symlink, target_kobj);
+
+ if (sl->target_kobj == needle) {
+ /* sysfs_remove_link needs the lock. sigh */
+ spin_unlock(&kset->list_lock);
+
+ sysfs_remove_link(k, sl->link_name);
+ /*
+ * Somehow sysfs_remove_link does
+ * not clean up after itself
+ */
+ kfree(sl->link_name);
+ kfree(sl);
+ kobject_put(needle);
+ goto restart;
+ }
+ }
+ spin_unlock(&kset->list_lock);
+}
+
static int sysfs_get_target_path(struct kobject * kobj, struct kobject * target,
char *path)
{
@@ -188,5 +220,6 @@ const struct inode_operations sysfs_syml
};
-EXPORT_SYMBOL_GPL(sysfs_create_link);
EXPORT_SYMBOL_GPL(sysfs_remove_link);
+EXPORT_SYMBOL_GPL(sysfs_remove_links);
+EXPORT_SYMBOL_GPL(sysfs_create_link);
Index: linux-2.6.21-rc6/include/linux/kobject.h
===================================================================
--- linux-2.6.21-rc6.orig/include/linux/kobject.h 2007-04-20 17:09:03.000000000 -0700
+++ linux-2.6.21-rc6/include/linux/kobject.h 2007-04-20 17:09:49.000000000 -0700
@@ -166,6 +166,9 @@ static inline struct kobj_type * get_kty
extern struct kobject * kset_find_obj(struct kset *, const char *);
+extern void sysfs_remove_links(struct kset *kset, struct kobject *needle);
+
+
/**
* Use this when initializing an embedded kset with no other
-
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