1 files changed, 51 insertions, 2 deletions

diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c
index 1ad8c93c1b85..07c1b4ec00df 100644
--- a/fs/sysfs/file.c
+++ b/fs/sysfs/file.c
@@ -488,17 +488,56 @@ const struct file_operations sysfs_file_operations = {
         .poll           = sysfs_poll,
 };
 
+int sysfs_attr_ns(struct kobject *kobj, const struct attribute *attr,
+                  const void **pns)
+{
+        struct sysfs_dirent *dir_sd = kobj->sd;
+        const struct sysfs_ops *ops;
+        const void *ns = NULL;
+        int err;
+
+        err = 0;
+        if (!sysfs_ns_type(dir_sd))
+                goto out;
+
+        err = -EINVAL;
+        if (!kobj->ktype)
+                goto out;
+        ops = kobj->ktype->sysfs_ops;
+        if (!ops)
+                goto out;
+        if (!ops->namespace)
+                goto out;
+
+        err = 0;
+        ns = ops->namespace(kobj, attr);
+out:
+        if (err) {
+                WARN(1, KERN_ERR "missing sysfs namespace attribute operation for "
+                     "kobject: %s\n", kobject_name(kobj));
+        }
+        *pns = ns;
+        return err;
+}
+
 int sysfs_add_file_mode(struct sysfs_dirent *dir_sd,
                         const struct attribute *attr, int type, mode_t amode)
 {
         umode_t mode = (amode & S_IALLUGO) | S_IFREG;
         struct sysfs_addrm_cxt acxt;
         struct sysfs_dirent *sd;
+        const void *ns;
         int rc;
 
+        rc = sysfs_attr_ns(dir_sd->s_dir.kobj, attr, &ns);
+        if (rc)
+                return rc;
+
         sd = sysfs_new_dirent(attr->name, mode, type);
         if (!sd)
                 return -ENOMEM;
+
+        sd->s_ns = ns;
         sd->s_attr.attr = (void *)attr;
         sysfs_dirent_init_lockdep(sd);
 
@@ -586,12 +625,17 @@ int sysfs_chmod_file(struct kobject *kobj, const struct attribute *attr,
 {
         struct sysfs_dirent *sd;
         struct iattr newattrs;
+        const void *ns;
         int rc;
 
+        rc = sysfs_attr_ns(kobj, attr, &ns);
+        if (rc)
+                return rc;
+
         mutex_lock(&sysfs_mutex);
 
         rc = -ENOENT;
-        sd = sysfs_find_dirent(kobj->sd, NULL, attr->name);
+        sd = sysfs_find_dirent(kobj->sd, ns, attr->name);
         if (!sd)
                 goto out;
 
@@ -616,7 +660,12 @@ EXPORT_SYMBOL_GPL(sysfs_chmod_file);
 
 void sysfs_remove_file(struct kobject * kobj, const struct attribute * attr)
 {
-        sysfs_hash_and_remove(kobj->sd, NULL, attr->name);
+        const void *ns;
+
+        if (sysfs_attr_ns(kobj, attr, &ns))
+                return;
+
+        sysfs_hash_and_remove(kobj->sd, ns, attr->name);
 }
 
 void sysfs_remove_files(struct kobject * kobj, const struct attribute **ptr)