This should give a nice message with symbol names for when we have an
open file that doesn't have an f_op->checkpoint.
Something along the lines of:
[1133:c/r:checkpoint_file] file operations have no checkpoint handler:tty_open+0x0/0x24
diff --git a/checkpoint/files.c b/checkpoint/files.c
index 5be7d1b..566fc9a 100644
--- a/checkpoint/files.c
+++ b/checkpoint/files.c
@@ -193,8 +193,11 @@ int checkpoint_file(struct ckpt_ctx *ctx, void *ptr)
{
struct file *file = (struct file *) ptr;
- if (!file->f_op || !file->f_op->checkpoint)
+ if (!file->f_op || !file->f_op->checkpoint) {
+ ckpt_debug("file operations have no checkpoint handler: %pS\n",
+ file->f_op);
return -EBADF;
+ }
if (d_unhashed(file->f_dentry) && !IS_ROOT(file->f_dentry))
return -EBADF;
return file->f_op->checkpoint(ctx, file);
-- Dave
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