3.16.65-rc1 review patch. If anyone has any objections, please let me know.
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From: Vasily Averin <vvs@xxxxxxxxxxxxx>
commit 4ecd55ea074217473f94cfee21bb72864d39f8d7 upstream.
After commit d202cce8963d, an expired cache_head can be removed from the
cache_detail's hash.
However, the expired cache_head may be waiting for a reply from a
previously submitted request. Such a cache_head has an increased
refcounter and therefore it won't be freed after cache_put(freeme).
Because the cache_head was removed from the hash it cannot be found
during cache_clean() and can be leaked forever, together with stalled
cache_request and other taken resources.
In our case we noticed it because an entry in the export cache was
holding a reference on a filesystem.
Fixes d202cce8963d ("sunrpc: never return expired entries in sunrpc_cache_lookup")
Cc: Pavel Tikhomirov <ptikhomirov@xxxxxxxxxxxxx>
Signed-off-by: Vasily Averin <vvs@xxxxxxxxxxxxx>
Reviewed-by: NeilBrown <neilb@xxxxxxxx>
Signed-off-by: J. Bruce Fields <bfields@xxxxxxxxxx>
[bwh: Backported to 3.16:
- cache_fresh_lock() doesn't take a struct cache_detail pointer
- Adjust context]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
net/sunrpc/cache.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
--- a/net/sunrpc/cache.c
+++ b/net/sunrpc/cache.c
@@ -50,6 +50,10 @@ static void cache_init(struct cache_head
h->last_refresh = now;
}
+static void cache_fresh_locked(struct cache_head *head, time_t expiry);
+static void cache_fresh_unlocked(struct cache_head *head,
+ struct cache_detail *detail);
+
struct cache_head *sunrpc_cache_lookup(struct cache_detail *detail,
struct cache_head *key, int hash)
{
@@ -94,6 +98,7 @@ struct cache_head *sunrpc_cache_lookup(s
*hp = tmp->next;
tmp->next = NULL;
detail->entries --;
+ cache_fresh_locked(tmp, 0);
freeme = tmp;
break;
}
@@ -109,8 +114,10 @@ struct cache_head *sunrpc_cache_lookup(s
cache_get(new);
write_unlock(&detail->hash_lock);
- if (freeme)
+ if (freeme) {
+ cache_fresh_unlocked(freeme, detail);
cache_put(freeme, detail);
+ }
return new;
}
EXPORT_SYMBOL_GPL(sunrpc_cache_lookup);
