Driver Core: devtmpfs: do not remove non-kernel-created directories
Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/base/devtmpfs.c b/drivers/base/devtmpfs.c
index 880a203..c7f5c08 100644
--- a/drivers/base/devtmpfs.c
+++ b/drivers/base/devtmpfs.c
@@ -76,37 +76,26 @@
dentry = lookup_create(&nd, 1);
if (!IS_ERR(dentry)) {
err = vfs_mkdir(nd.path.dentry->d_inode, dentry, mode);
+ if (!err)
+ /* mark as kernel-created inode */
+ dentry->d_inode->i_private = &dev_mnt;
dput(dentry);
} else {
err = PTR_ERR(dentry);
}
- mutex_unlock(&nd.path.dentry->d_inode->i_mutex);
+ mutex_unlock(&nd.path.dentry->d_inode->i_mutex);
path_put(&nd.path);
return err;
}
static int create_path(const char *nodepath)
{
- struct nameidata nd;
- int err = 0;
+ int err;
read_lock(&dirlock);
- err = vfs_path_lookup(dev_mnt->mnt_root, dev_mnt,
- nodepath, LOOKUP_PARENT, &nd);
- if (err == 0) {
- struct dentry *dentry;
-
- /* create directory right away */
- dentry = lookup_create(&nd, 1);
- if (!IS_ERR(dentry)) {
- err = vfs_mkdir(nd.path.dentry->d_inode,
- dentry, 0755);
- dput(dentry);
- }
- mutex_unlock(&nd.path.dentry->d_inode->i_mutex);
- path_put(&nd.path);
- } else if (err == -ENOENT) {
+ err = dev_mkdir(nodepath, 0755);
+ if (err == -ENOENT) {
char *path;
char *s;
@@ -129,7 +118,6 @@
kfree(path);
}
read_unlock(&dirlock);
-
return err;
}
@@ -213,16 +201,21 @@
mutex_lock_nested(&nd.path.dentry->d_inode->i_mutex, I_MUTEX_PARENT);
dentry = lookup_one_len(nd.last.name, nd.path.dentry, nd.last.len);
if (!IS_ERR(dentry)) {
- if (dentry->d_inode)
- err = vfs_rmdir(nd.path.dentry->d_inode, dentry);
- else
+ if (dentry->d_inode) {
+ if (dentry->d_inode->i_private == &dev_mnt)
+ err = vfs_rmdir(nd.path.dentry->d_inode,
+ dentry);
+ else
+ err = -EPERM;
+ } else {
err = -ENOENT;
+ }
dput(dentry);
} else {
err = PTR_ERR(dentry);
}
- mutex_unlock(&nd.path.dentry->d_inode->i_mutex);
+ mutex_unlock(&nd.path.dentry->d_inode->i_mutex);
path_put(&nd.path);
return err;
}