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| author | NeilBrown <neilb@suse.de> | 2009-08-04 07:22:38 +0200 |
|---|---|---|
| committer | J. Bruce Fields <bfields@citi.umich.edu> | 2009-08-04 17:03:01 +0200 |
| commit | 5c4d26390341732a8d614141a4cf4663610a1698 (patch) | |
| tree | 1361af921aadc75c1a1fa1a23eb83292dcad8130 /net | |
| parent | sunrpc/cache: rename queue_loose to cache_dequeue (diff) | |
| download | linux-5c4d26390341732a8d614141a4cf4663610a1698.tar.xz linux-5c4d26390341732a8d614141a4cf4663610a1698.zip | |
sunrpc/cache: make sure deferred requests eventually get revisited.
While deferred requests normally get revisited quite quickly,
it is possible for a request to remain in the deferral queue
when the cache item is discarded. We can easily make sure that
doesn't happen by calling cache_revisit_request just before
the final 'put'.
Also there is a small chance that a race would cause one thread to
defer a request against a cache item while another thread is failing
to queue an upcall for that item. So when the upcall fails, make
sure to revisit all deferred requests.
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Diffstat (limited to 'net')
| -rw-r--r-- | net/sunrpc/cache.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c index d19c07583f8f..44f45166378a 100644 --- a/net/sunrpc/cache.c +++ b/net/sunrpc/cache.c @@ -221,6 +221,7 @@ int cache_check(struct cache_detail *detail, switch (cache_make_upcall(detail, h)) { case -EINVAL: clear_bit(CACHE_PENDING, &h->flags); + cache_revisit_request(h); if (rv == -EAGAIN) { set_bit(CACHE_NEGATIVE, &h->flags); cache_fresh_unlocked(h, detail, @@ -473,8 +474,10 @@ static int cache_clean(void) if (!ch) current_index ++; spin_unlock(&cache_list_lock); - if (ch) + if (ch) { + cache_revisit_request(ch); cache_put(ch, d); + } } else spin_unlock(&cache_list_lock); |