Re: [PATCH v7 1/4] spinlock: A new lockref structure for locklessupdate of refcount

[Al Viro]

On Fri, Aug 30, 2013 at 04:35:49PM -0400, Waiman Long wrote:

> The AIM7 test was run on a set of 16 ramdisk formated with ext3
> filesystem with the following mount options:
> barrier=0,async,noatime,nodiratime. Maybe that is a factor.

I would be really surprised if it was...  Could you slap the following
into __fput():

	struct mount *m = real_mount(mnt);
	if (unlikely(!m->mnt_ns)) {
		printk(KERN_INFO "type = %s",
			mnt->mnt_sb->s_type->name);
		WARN_ON(1);
	}
and see what it catches?  That'll need #include "fs/mount.h" in
fs/file_table.c to compile...
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