Re: [PATCH v5] fs: clear file privilege bits when mmap writing

[Al Viro]

On Thu, Dec 10, 2015 at 07:16:11PM +0100, Willy Tarreau wrote:

> > Is f_flags safe to write like this without holding a lock?
> 
> Unfortunately I have no idea. I've seen places where it's written without
> taking a lock such as in blkdev_open() and I don't think that this one is
> called with a lock held.

In any ->open() we obviously have nobody else able to find that struct file,
let alone modify it, so there the damn thing is essentially caller-private
and no locking is needed.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/