ext4: fix data corruption caused by unwritten and delayed extents

[firefly-linux-kernel-4.4.55.git] / fs / proc / inode.c

diff --git a/fs/proc/inode.c b/fs/proc/inode.c
index 13a50a32652dc868ab94084a1e07fb4a809e43da..7697b6621cfd5b13051318ba15920646942ed528 100644 (file)
--- a/fs/proc/inode.c
+++ b/fs/proc/inode.c
@@ -23,6 +23,7 @@
 #include <linux/slab.h>
 #include <linux/mount.h>
 #include <linux/magic.h>
+#include <linux/namei.h>
 
 #include <asm/uaccess.h>
 
@@ -393,6 +394,26 @@ static const struct file_operations proc_reg_file_ops_no_compat = {
 };
 #endif
 
+static void *proc_follow_link(struct dentry *dentry, struct nameidata *nd)
+{
+       struct proc_dir_entry *pde = PDE(dentry->d_inode);
+       if (unlikely(!use_pde(pde)))
+               return ERR_PTR(-EINVAL);
+       nd_set_link(nd, pde->data);
+       return pde;
+}
+
+static void proc_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
+{
+       unuse_pde(p);
+}
+
+const struct inode_operations proc_link_inode_operations = {
+       .readlink       = generic_readlink,
+       .follow_link    = proc_follow_link,
+       .put_link       = proc_put_link,
+};
+
 struct inode *proc_get_inode(struct super_block *sb, struct proc_dir_entry *de)
 {
        struct inode *inode = new_inode_pseudo(sb);