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author | NeilBrown <neilb@suse.de> | 2010-08-12 17:04:06 +1000 |
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committer | J. Bruce Fields <bfields@redhat.com> | 2010-09-21 17:08:31 -0400 |
commit | 839049a8732d689d02051e0198fb60a22f7ccb4b (patch) | |
tree | 7ae2ec763232f79f98a0d8122d710ac9887fb8b9 | |
parent | 8ff30fa4eff2ff9e207961c654caa093f0c84873 (diff) | |
download | op-kernel-dev-839049a8732d689d02051e0198fb60a22f7ccb4b.zip op-kernel-dev-839049a8732d689d02051e0198fb60a22f7ccb4b.tar.gz |
nfsd/idmap: drop special request deferal in favour of improved default.
The idmap code manages request deferal by waiting for a reply from
userspace rather than putting the NFS request on a queue to be retried
from the start.
Now that the common deferal code does this there is no need for the
special code in idmap.
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
-rw-r--r-- | fs/nfsd/nfs4idmap.c | 105 |
1 files changed, 11 insertions, 94 deletions
diff --git a/fs/nfsd/nfs4idmap.c b/fs/nfsd/nfs4idmap.c index 808b33a4..f0695e8 100644 --- a/fs/nfsd/nfs4idmap.c +++ b/fs/nfsd/nfs4idmap.c @@ -482,109 +482,26 @@ nfsd_idmap_shutdown(void) cache_unregister(&nametoid_cache); } -/* - * Deferred request handling - */ - -struct idmap_defer_req { - struct cache_req req; - struct cache_deferred_req deferred_req; - wait_queue_head_t waitq; - atomic_t count; -}; - -static inline void -put_mdr(struct idmap_defer_req *mdr) -{ - if (atomic_dec_and_test(&mdr->count)) - kfree(mdr); -} - -static inline void -get_mdr(struct idmap_defer_req *mdr) -{ - atomic_inc(&mdr->count); -} - -static void -idmap_revisit(struct cache_deferred_req *dreq, int toomany) -{ - struct idmap_defer_req *mdr = - container_of(dreq, struct idmap_defer_req, deferred_req); - - wake_up(&mdr->waitq); - put_mdr(mdr); -} - -static struct cache_deferred_req * -idmap_defer(struct cache_req *req) -{ - struct idmap_defer_req *mdr = - container_of(req, struct idmap_defer_req, req); - - mdr->deferred_req.revisit = idmap_revisit; - get_mdr(mdr); - return (&mdr->deferred_req); -} - -static inline int -do_idmap_lookup(struct ent *(*lookup_fn)(struct ent *), struct ent *key, - struct cache_detail *detail, struct ent **item, - struct idmap_defer_req *mdr) -{ - *item = lookup_fn(key); - if (!*item) - return -ENOMEM; - return cache_check(detail, &(*item)->h, &mdr->req); -} - -static inline int -do_idmap_lookup_nowait(struct ent *(*lookup_fn)(struct ent *), - struct ent *key, struct cache_detail *detail, - struct ent **item) -{ - int ret = -ENOMEM; - - *item = lookup_fn(key); - if (!*item) - goto out_err; - ret = -ETIMEDOUT; - if (!test_bit(CACHE_VALID, &(*item)->h.flags) - || (*item)->h.expiry_time < seconds_since_boot() - || detail->flush_time > (*item)->h.last_refresh) - goto out_put; - ret = -ENOENT; - if (test_bit(CACHE_NEGATIVE, &(*item)->h.flags)) - goto out_put; - return 0; -out_put: - cache_put(&(*item)->h, detail); -out_err: - *item = NULL; - return ret; -} - static int idmap_lookup(struct svc_rqst *rqstp, struct ent *(*lookup_fn)(struct ent *), struct ent *key, struct cache_detail *detail, struct ent **item) { - struct idmap_defer_req *mdr; int ret; - mdr = kzalloc(sizeof(*mdr), GFP_KERNEL); - if (!mdr) + *item = lookup_fn(key); + if (!*item) return -ENOMEM; - atomic_set(&mdr->count, 1); - init_waitqueue_head(&mdr->waitq); - mdr->req.defer = idmap_defer; - ret = do_idmap_lookup(lookup_fn, key, detail, item, mdr); - if (ret == -EAGAIN) { - wait_event_interruptible_timeout(mdr->waitq, - test_bit(CACHE_VALID, &(*item)->h.flags), 1 * HZ); - ret = do_idmap_lookup_nowait(lookup_fn, key, detail, item); + retry: + ret = cache_check(detail, &(*item)->h, &rqstp->rq_chandle); + + if (ret == -ETIMEDOUT) { + struct ent *prev_item = *item; + *item = lookup_fn(key); + if (*item != prev_item) + goto retry; + cache_put(&(*item)->h, detail); } - put_mdr(mdr); return ret; } |