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Diffstat (limited to 'fs/sysfs/dir.c')
-rw-r--r--fs/sysfs/dir.c88
1 files changed, 64 insertions, 24 deletions
diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
index 08c66969d52a..5e73d6626e50 100644
--- a/fs/sysfs/dir.c
+++ b/fs/sysfs/dir.c
@@ -111,11 +111,6 @@ static int sysfs_link_sibling(struct sysfs_dirent *sd)
/* add new node and rebalance the tree */
rb_link_node(&sd->s_rb, parent, node);
rb_insert_color(&sd->s_rb, &sd->s_parent->s_dir.children);
-
- /* if @sd has ns tag, mark the parent to enable ns filtering */
- if (sd->s_ns)
- sd->s_parent->s_flags |= SYSFS_FLAG_HAS_NS;
-
return 0;
}
@@ -135,13 +130,6 @@ static void sysfs_unlink_sibling(struct sysfs_dirent *sd)
sd->s_parent->s_dir.subdirs--;
rb_erase(&sd->s_rb, &sd->s_parent->s_dir.children);
-
- /*
- * Either all or none of the children have tags. Clearing HAS_NS
- * when there's no child left is enough to keep the flag synced.
- */
- if (RB_EMPTY_ROOT(&sd->s_parent->s_dir.children))
- sd->s_parent->s_flags &= ~SYSFS_FLAG_HAS_NS;
}
/**
@@ -291,6 +279,7 @@ static int sysfs_dentry_delete(const struct dentry *dentry)
static int sysfs_dentry_revalidate(struct dentry *dentry, unsigned int flags)
{
struct sysfs_dirent *sd;
+ int type;
if (flags & LOOKUP_RCU)
return -ECHILD;
@@ -311,8 +300,13 @@ static int sysfs_dentry_revalidate(struct dentry *dentry, unsigned int flags)
goto out_bad;
/* The sysfs dirent has been moved to a different namespace */
- if (sd->s_ns && sd->s_ns != sysfs_info(dentry->d_sb)->ns)
- goto out_bad;
+ type = KOBJ_NS_TYPE_NONE;
+ if (sd->s_parent) {
+ type = sysfs_ns_type(sd->s_parent);
+ if (type != KOBJ_NS_TYPE_NONE &&
+ sysfs_info(dentry->d_sb)->ns[type] != sd->s_ns)
+ goto out_bad;
+ }
mutex_unlock(&sysfs_mutex);
out_valid:
@@ -432,6 +426,13 @@ int __sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd,
struct sysfs_inode_attrs *ps_iattr;
int ret;
+ if (!!sysfs_ns_type(parent_sd) != !!sd->s_ns) {
+ WARN(1, KERN_WARNING "sysfs: ns %s in '%s' for '%s'\n",
+ sysfs_ns_type(parent_sd) ? "required" : "invalid",
+ parent_sd->s_name, sd->s_name);
+ return -EINVAL;
+ }
+
sd->s_hash = sysfs_name_hash(sd->s_name, sd->s_ns);
sd->s_parent = sysfs_get(parent_sd);
@@ -611,6 +612,13 @@ struct sysfs_dirent *sysfs_find_dirent(struct sysfs_dirent *parent_sd,
struct rb_node *node = parent_sd->s_dir.children.rb_node;
unsigned int hash;
+ if (!!sysfs_ns_type(parent_sd) != !!ns) {
+ WARN(1, KERN_WARNING "sysfs: ns %s in '%s' for '%s'\n",
+ sysfs_ns_type(parent_sd) ? "required" : "invalid",
+ parent_sd->s_name, name);
+ return NULL;
+ }
+
hash = sysfs_name_hash(name, ns);
while (node) {
struct sysfs_dirent *sd;
@@ -659,6 +667,7 @@ struct sysfs_dirent *sysfs_get_dirent_ns(struct sysfs_dirent *parent_sd,
EXPORT_SYMBOL_GPL(sysfs_get_dirent_ns);
static int create_dir(struct kobject *kobj, struct sysfs_dirent *parent_sd,
+ enum kobj_ns_type type,
const char *name, const void *ns,
struct sysfs_dirent **p_sd)
{
@@ -672,6 +681,7 @@ static int create_dir(struct kobject *kobj, struct sysfs_dirent *parent_sd,
if (!sd)
return -ENOMEM;
+ sd->s_flags |= (type << SYSFS_NS_TYPE_SHIFT);
sd->s_ns = ns;
sd->s_dir.kobj = kobj;
@@ -691,7 +701,33 @@ static int create_dir(struct kobject *kobj, struct sysfs_dirent *parent_sd,
int sysfs_create_subdir(struct kobject *kobj, const char *name,
struct sysfs_dirent **p_sd)
{
- return create_dir(kobj, kobj->sd, name, NULL, p_sd);
+ return create_dir(kobj, kobj->sd,
+ KOBJ_NS_TYPE_NONE, name, NULL, p_sd);
+}
+
+/**
+ * sysfs_read_ns_type: return associated ns_type
+ * @kobj: the kobject being queried
+ *
+ * Each kobject can be tagged with exactly one namespace type
+ * (i.e. network or user). Return the ns_type associated with
+ * this object if any
+ */
+static enum kobj_ns_type sysfs_read_ns_type(struct kobject *kobj)
+{
+ const struct kobj_ns_type_operations *ops;
+ enum kobj_ns_type type;
+
+ ops = kobj_child_ns_ops(kobj);
+ if (!ops)
+ return KOBJ_NS_TYPE_NONE;
+
+ type = ops->type;
+ BUG_ON(type <= KOBJ_NS_TYPE_NONE);
+ BUG_ON(type >= KOBJ_NS_TYPES);
+ BUG_ON(!kobj_ns_type_registered(type));
+
+ return type;
}
/**
@@ -701,6 +737,7 @@ int sysfs_create_subdir(struct kobject *kobj, const char *name,
*/
int sysfs_create_dir_ns(struct kobject *kobj, const void *ns)
{
+ enum kobj_ns_type type;
struct sysfs_dirent *parent_sd, *sd;
int error = 0;
@@ -714,7 +751,9 @@ int sysfs_create_dir_ns(struct kobject *kobj, const void *ns)
if (!parent_sd)
return -ENOENT;
- error = create_dir(kobj, parent_sd, kobject_name(kobj), ns, &sd);
+ type = sysfs_read_ns_type(kobj);
+
+ error = create_dir(kobj, parent_sd, type, kobject_name(kobj), ns, &sd);
if (!error)
kobj->sd = sd;
return error;
@@ -728,12 +767,13 @@ static struct dentry *sysfs_lookup(struct inode *dir, struct dentry *dentry,
struct sysfs_dirent *parent_sd = parent->d_fsdata;
struct sysfs_dirent *sd;
struct inode *inode;
- const void *ns = NULL;
+ enum kobj_ns_type type;
+ const void *ns;
mutex_lock(&sysfs_mutex);
- if (parent_sd->s_flags & SYSFS_FLAG_HAS_NS)
- ns = sysfs_info(dir->i_sb)->ns;
+ type = sysfs_ns_type(parent_sd);
+ ns = sysfs_info(dir->i_sb)->ns[type];
sd = sysfs_find_dirent(parent_sd, dentry->d_name.name, ns);
@@ -1056,15 +1096,15 @@ static int sysfs_readdir(struct file *file, struct dir_context *ctx)
struct dentry *dentry = file->f_path.dentry;
struct sysfs_dirent *parent_sd = dentry->d_fsdata;
struct sysfs_dirent *pos = file->private_data;
- const void *ns = NULL;
+ enum kobj_ns_type type;
+ const void *ns;
+
+ type = sysfs_ns_type(parent_sd);
+ ns = sysfs_info(dentry->d_sb)->ns[type];
if (!dir_emit_dots(file, ctx))
return 0;
mutex_lock(&sysfs_mutex);
-
- if (parent_sd->s_flags & SYSFS_FLAG_HAS_NS)
- ns = sysfs_info(dentry->d_sb)->ns;
-
for (pos = sysfs_dir_pos(ns, parent_sd, ctx->pos, pos);
pos;
pos = sysfs_dir_next_pos(ns, parent_sd, ctx->pos, pos)) {