Re: [patch] cgroup fs: avoid switching ->d_op on live dentry

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On Tue, Dec 21, 2010 at 7:25 PM, Al Viro <viro@xxxxxxxxxxxxxxxxxx> wrote:
> On Tue, Dec 21, 2010 at 07:55:38PM +1100, Nick Piggin wrote:
>> On Tue, Dec 21, 2010 at 09:44:40AM +0100, Sedat Dilek wrote:
>> > Against linux-next (next-20101210) it should look like:
>>
>> Yep, I'll rebase my tree with the fix shortly.
>>
>> >
>> > $ diff -Naur cgroup-fix/cgroup-fs-avoid-switching-d_op-on-live-dentry.patch
>> > cgroup-fix/cgroup-fs-avoid-switching-d_op-on-live-dentry-v2.patch
>> > --- cgroup-fix/cgroup-fs-avoid-switching-d_op-on-live-dentry.patch
>> > Â2010-12-21 09:31:38.649601964 +0100
>> > +++ cgroup-fix/cgroup-fs-avoid-switching-d_op-on-live-dentry-v2.patch
>> > Â2010-12-21 09:40:21.151033232 +0100
>> > @@ -83,7 +83,7 @@
>> > Â Â Â Â Â Â Â Â inode->i_size = 0;
>> > Â Â Â Â Â Â Â Â inode->i_fop = &cgroup_file_operations;
>> > Â Â Â Â }
>> > -- Â Â Âdentry->d_op = &cgroup_dops;
>> > +- Â Â Âd_set_d_op(dentry, &cgroup_dops);
>> > Â Â Â Â d_instantiate(dentry, inode);
>> > Â Â Â Â dget(dentry); Â /* Extra count - pin the dentry in core */
>> > Â Â Â Â return 0;
>
> How about not doing that d_set_d_op() at all? ÂSee #d_op in vfs-2.6.git;
> just set ->s_d_op to that once and be done with that. ÂNo need to reassign
> it on a live dentry...
>

The kernel mirrors are very slow since yesterday.
Checking out and online-browsing your repo [1] is no fun.
On a very quick view I don't see a cgroup fix.

Can you please offer a revised full patch?
Thanks in advance.

Personally, I am glad to be able to use systemd, again.

- Sedat -

[1] http://git.kernel.org/?p=linux/kernel/git/viro/vfs-2.6.git;a=shortlog;h=refs/heads/d_op
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