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path: root/fs/sysfs/mount.c
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Diffstat (limited to 'fs/sysfs/mount.c')
-rw-r--r--fs/sysfs/mount.c33
1 files changed, 32 insertions, 1 deletions
diff --git a/fs/sysfs/mount.c b/fs/sysfs/mount.c
index 50e4fb6a7403..1afa32ba242c 100644
--- a/fs/sysfs/mount.c
+++ b/fs/sysfs/mount.c
@@ -35,7 +35,7 @@ static const struct super_operations sysfs_ops = {
struct sysfs_dirent sysfs_root = {
.s_name = "",
.s_count = ATOMIC_INIT(1),
- .s_flags = SYSFS_DIR,
+ .s_flags = SYSFS_DIR | (KOBJ_NS_TYPE_NONE << SYSFS_NS_TYPE_SHIFT),
.s_mode = S_IFDIR | S_IRWXU | S_IRUGO | S_IXUGO,
.s_ino = 1,
};
@@ -76,7 +76,13 @@ static int sysfs_test_super(struct super_block *sb, void *data)
{
struct sysfs_super_info *sb_info = sysfs_info(sb);
struct sysfs_super_info *info = data;
+ enum kobj_ns_type type;
int found = 1;
+
+ for (type = KOBJ_NS_TYPE_NONE; type < KOBJ_NS_TYPES; type++) {
+ if (sb_info->ns[type] != info->ns[type])
+ found = 0;
+ }
return found;
}
@@ -93,6 +99,7 @@ static int sysfs_get_sb(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data, struct vfsmount *mnt)
{
struct sysfs_super_info *info;
+ enum kobj_ns_type type;
struct super_block *sb;
int error;
@@ -100,6 +107,10 @@ static int sysfs_get_sb(struct file_system_type *fs_type,
info = kzalloc(sizeof(*info), GFP_KERNEL);
if (!info)
goto out;
+
+ for (type = KOBJ_NS_TYPE_NONE; type < KOBJ_NS_TYPES; type++)
+ info->ns[type] = kobj_ns_current(type);
+
sb = sget(fs_type, sysfs_test_super, sysfs_set_super, info);
if (IS_ERR(sb) || sb->s_fs_info != info)
kfree(info);
@@ -137,6 +148,26 @@ static struct file_system_type sysfs_fs_type = {
.kill_sb = sysfs_kill_sb,
};
+void sysfs_exit_ns(enum kobj_ns_type type, const void *ns)
+{
+ struct super_block *sb;
+
+ mutex_lock(&sysfs_mutex);
+ spin_lock(&sb_lock);
+ list_for_each_entry(sb, &sysfs_fs_type.fs_supers, s_instances) {
+ struct sysfs_super_info *info = sysfs_info(sb);
+ /* Ignore superblocks that are in the process of unmounting */
+ if (sb->s_count <= S_BIAS)
+ continue;
+ /* Ignore superblocks with the wrong ns */
+ if (info->ns[type] != ns)
+ continue;
+ info->ns[type] = NULL;
+ }
+ spin_unlock(&sb_lock);
+ mutex_unlock(&sysfs_mutex);
+}
+
int __init sysfs_init(void)
{
int err = -ENOMEM;