Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/base/devtmpfs.c b/drivers/base/devtmpfs.c
index f776807..30d0523 100644
--- a/drivers/base/devtmpfs.c
+++ b/drivers/base/devtmpfs.c
@@ -25,6 +25,7 @@
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/kthread.h>
+#include <uapi/linux/mount.h>
#include "base.h"
static struct task_struct *thread;
@@ -55,20 +56,32 @@
}
__setup("devtmpfs.mount=", mount_param);
-static struct dentry *dev_mount(struct file_system_type *fs_type, int flags,
+static struct vfsmount *mnt;
+
+static struct dentry *public_dev_mount(struct file_system_type *fs_type, int flags,
const char *dev_name, void *data)
{
-#ifdef CONFIG_TMPFS
- return mount_single(fs_type, flags, data, shmem_fill_super);
-#else
- return mount_single(fs_type, flags, data, ramfs_fill_super);
-#endif
+ struct super_block *s = mnt->mnt_sb;
+ atomic_inc(&s->s_active);
+ down_write(&s->s_umount);
+ return dget(s->s_root);
}
+static struct file_system_type internal_fs_type = {
+ .name = "devtmpfs",
+#ifdef CONFIG_TMPFS
+ .init_fs_context = shmem_init_fs_context,
+ .parameters = &shmem_fs_parameters,
+#else
+ .init_fs_context = ramfs_init_fs_context,
+ .parameters = &ramfs_fs_parameters,
+#endif
+ .kill_sb = kill_litter_super,
+};
+
static struct file_system_type dev_fs_type = {
.name = "devtmpfs",
- .mount = dev_mount,
- .kill_sb = kill_litter_super,
+ .mount = public_dev_mount,
};
#ifdef CONFIG_BLOCK
@@ -252,7 +265,7 @@
static int delete_path(const char *nodepath)
{
- const char *path;
+ char *path;
int err = 0;
path = kstrdup(nodepath, GFP_KERNEL);
@@ -356,8 +369,7 @@
if (!thread)
return 0;
- err = ksys_mount("devtmpfs", (char *)mntdir, "devtmpfs", MS_SILENT,
- NULL);
+ err = ksys_mount("devtmpfs", mntdir, "devtmpfs", MS_SILENT, NULL);
if (err)
printk(KERN_INFO "devtmpfs: error mounting %i\n", err);
else
@@ -378,12 +390,11 @@
static int devtmpfsd(void *p)
{
- char options[] = "mode=0755";
int *err = p;
*err = ksys_unshare(CLONE_NEWNS);
if (*err)
goto out;
- *err = ksys_mount("devtmpfs", "/", "devtmpfs", MS_SILENT, options);
+ *err = ksys_mount("devtmpfs", "/", "devtmpfs", MS_SILENT, NULL);
if (*err)
goto out;
ksys_chdir("/.."); /* will traverse into overmounted root */
@@ -420,7 +431,16 @@
*/
int __init devtmpfs_init(void)
{
- int err = register_filesystem(&dev_fs_type);
+ char opts[] = "mode=0755";
+ int err;
+
+ mnt = vfs_kern_mount(&internal_fs_type, 0, "devtmpfs", opts);
+ if (IS_ERR(mnt)) {
+ printk(KERN_ERR "devtmpfs: unable to create devtmpfs %ld\n",
+ PTR_ERR(mnt));
+ return PTR_ERR(mnt);
+ }
+ err = register_filesystem(&dev_fs_type);
if (err) {
printk(KERN_ERR "devtmpfs: unable to register devtmpfs "
"type %i\n", err);