Re: [RFC] pdirops: vfs patch

[Jan Blunck]

Quoting Alex Tomas <alex@xxxxxxxxxxxxx>:

> >>>>> Jan Blunck (JB) writes:
>
>  JB> i_sem does NOT protect the dcache. Also not in real_lookup(). The lock
> must be
>  JB> acquired for ->lookup() and because we might sleep on i_sem, we have to
> get it
>  JB> early and check for repopulation of the dcache.
>
> dentry is part of dcache, right? i_sem protects dentry from being
> returned with incomplete data inside, right?
>

Nope, d_alloc() is setting d_flags to DCACHE_UNHASHED. Therefore it is not found
by __d_lookup() until it is rehashed which is implicit done by ->lookup().

Jan
-
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/