On Wed, 26 Jun 2013, majianpeng wrote:
> >I think in this case we don't want to drop other caps. This basically
> >means we weren't able to maintain the desired level of reserves, but we
> >will continue to try to fill it periodically, and not reaching the desired
> >point is not a reason to throw out what we have. You'll note that the one
> >caller ignores the return value..
> >
> I see.But the code don't.
> > for (i = have; i < need; i++) {
> > cap = kmem_cache_alloc(ceph_cap_cachep, GFP_NOFS);
> > if (!cap) {
> > ret = -ENOMEM;
> > goto out_alloc_count;
> > }
> > list_add(&cap->caps_item, &newcaps);
> > alloc++;
> > }
> > BUG_ON(have + alloc != need);
> For the caps which allocated, those can't add into '&mdsc->caps_list'.
> So if allocate failed,it will cause memory leak.
Ah, I see.
> By your thought, the code maybe like
>
> diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
> index da0f9b8..d5d5eca 100644
> --- a/fs/ceph/caps.c
> +++ b/fs/ceph/caps.c
> @@ -176,12 +176,11 @@ int ceph_reserve_caps(struct ceph_mds_client *mdsc,
> cap = kmem_cache_alloc(ceph_cap_cachep, GFP_NOFS);
> if (!cap) {
> ret = -ENOMEM;
> - goto out_alloc_count;
> + break;
> }
> list_add(&cap->caps_item, &newcaps);
> alloc++;
> }
> - BUG_ON(have + alloc != need);
>
> spin_lock(&mdsc->caps_list_lock);
> mdsc->caps_total_count += alloc;
>
That looks good. Can we add a check later though that if have + alloc <
need we still pr_warning?
> BTY, The function which call ceph_reserve_caps don't care the result.
> And from you comment, this will periodically do.So i think the function proto
> will be
> viod ceph_reserve_caps()
> {
> }
> How about this?
Yeah, sounds good to me.
Thanks!
sage
>
> Thanks!
> Jianpeng Ma
>
>
>
> >sage
> >
> >
> >On Tue, 25 Jun 2013, majianpeng wrote:
> >
> >> Signed-off-by: Jianpeng Ma <[email protected]>
> >> ---
> >> fs/ceph/caps.c | 5 +++++
> >> 1 file changed, 5 insertions(+)
> >>
> >> diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
> >> index da0f9b8..626b0ec 100644
> >> --- a/fs/ceph/caps.c
> >> +++ b/fs/ceph/caps.c
> >> @@ -203,6 +203,11 @@ out_alloc_count:
> >> /* we didn't manage to reserve as much as we needed */
> >> pr_warning("reserve caps ctx=%p ENOMEM need=%d got=%d\n",
> >> ctx, need, have);
> >> + if (alloc) {
> >> + struct ceph_cap *tmp;
> >> + list_for_each_entry_safe(cap, tmp, &newcaps, caps_item)
> >> + kmem_cache_free(ceph_cap_cachep, cap);
> >> + }
> >> return ret;
> >> }
> >>
> >> --
> >> 1.8.1.2
> >>
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