[PATCH] allow callers of seq_open do allocation themselves
Al Viro [Mon, 7 Nov 2005 22:15:34 +0000 (17:15 -0500)]
Allow caller of seq_open() to kmalloc() seq_file + whatever else they
want and set ->private_data to it.  seq_open() will then abstain from
doing allocation itself.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

fs/seq_file.c

index 38ef913..7c40570 100644 (file)
  */
 int seq_open(struct file *file, struct seq_operations *op)
 {
-       struct seq_file *p = kmalloc(sizeof(*p), GFP_KERNEL);
-       if (!p)
-               return -ENOMEM;
+       struct seq_file *p = file->private_data;
+
+       if (!p) {
+               p = kmalloc(sizeof(*p), GFP_KERNEL);
+               if (!p)
+                       return -ENOMEM;
+               file->private_data = p;
+       }
        memset(p, 0, sizeof(*p));
        sema_init(&p->sem, 1);
        p->op = op;
-       file->private_data = p;
 
        /*
         * Wrappers around seq_open(e.g. swaps_open) need to be