[PATCH] proc: link count fix

This patch fixes bug titled "sunrpc as module and bad proc/sys link count"
reported by Jiri Slaby.

The problem was, that only proc_dir_entry->nlink was updated and the
corresponding inode->i_nlink was not.  The fix is to implement the
inode->getattr() method, and update i_nlink (if necessary).

A quick audit of proc code shows that no other attribute changes after
creation.

Signed-off-by: Miklos Szeredi <miklos@szeredi.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/fs/proc/generic.c b/fs/proc/generic.c
index abe8920313fb32b84ad65b78861325727ae5ce45..8a8c34461d481c115a31d628d8e598bb68c20b26 100644 (file)
--- a/fs/proc/generic.c
+++ b/fs/proc/generic.c
@@ -249,6 +249,18 @@ out:
        return error;
 }
 
+static int proc_getattr(struct vfsmount *mnt, struct dentry *dentry,
+                       struct kstat *stat)
+{
+       struct inode *inode = dentry->d_inode;
+       struct proc_dir_entry *de = PROC_I(inode)->pde;
+       if (de && de->nlink)
+               inode->i_nlink = de->nlink;
+
+       generic_fillattr(inode, stat);
+       return 0;
+}
+
 static struct inode_operations proc_file_inode_operations = {
        .setattr        = proc_notify_change,
 };
@@ -475,6 +487,7 @@ static struct file_operations proc_dir_operations = {
  */
 static struct inode_operations proc_dir_inode_operations = {
        .lookup         = proc_lookup,
+       .getattr        = proc_getattr,
        .setattr        = proc_notify_change,
 };