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nfsd4: shut down more of delegation earlier

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Once we've unhashed the delegation, it's only hanging around for the
benefit of an oustanding recall, which only needs the encoded
filehandle, stateid, and dl_retries counter.  No point keeping the file
around any longer, or keeping it hashed.

This also fixes a race: calls to idr_remove should really be serialized
by the caller, but the nfs4_put_delegation call from the callback code
isn't taking the state lock.

(Better might be to cancel the callback before destroying the
delegation, and remove any need for reference counting--but I don't see
an easy way to cancel an rpc call.)

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
J. Bruce Fields 2013-03-21 11:21:50 -04:00
parent 8be2d2344c
commit 68a3396178
1 changed files with 7 additions and 6 deletions
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13
fs/nfsd/nfs4state.c
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@ -417,21 +417,18 @@ alloc_init_deleg(struct nfs4_client *clp, struct nfs4_ol_stateid *stp, struct sv
return dp;
}
static void free_stid(struct nfs4_stid *s, struct kmem_cache *slab)
static void remove_stid(struct nfs4_stid *s)
{
struct idr *stateids = &s->sc_client->cl_stateids;
idr_remove(stateids, s->sc_stateid.si_opaque.so_id);
kmem_cache_free(slab, s);
}
void
nfs4_put_delegation(struct nfs4_delegation *dp)
{
if (atomic_dec_and_test(&dp->dl_count)) {
dprintk("NFSD: freeing dp %p\n",dp);
put_nfs4_file(dp->dl_file);
free_stid(&dp->dl_stid, deleg_slab);
kmem_cache_free(deleg_slab, dp);
num_delegations--;
}
}
@ -462,6 +459,9 @@ unhash_delegation(struct nfs4_delegation *dp)
list_del_init(&dp->dl_recall_lru);
spin_unlock(&recall_lock);
nfs4_put_deleg_lease(dp->dl_file);
put_nfs4_file(dp->dl_file);
dp->dl_file = NULL;
remove_stid(&dp->dl_stid);
nfs4_put_delegation(dp);
}
@ -605,7 +605,8 @@ static void close_generic_stateid(struct nfs4_ol_stateid *stp)
static void free_generic_stateid(struct nfs4_ol_stateid *stp)
{
free_stid(&stp->st_stid, stateid_slab);
remove_stid(&stp->st_stid);
kmem_cache_free(stateid_slab, stp);
}
static void release_lock_stateid(struct nfs4_ol_stateid *stp)