diff options
author | NeilBrown <neilb@suse.de> | 2006-03-27 09:15:08 (GMT) |
---|---|---|
committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-03-27 16:44:43 (GMT) |
commit | ebd0cb1af3be2729cc1f574681dfba01fcf458d9 (patch) | |
tree | ed97a94406ed973573576fca585e1c87c15a4d05 /net/sunrpc/cache.c | |
parent | 4d90452cb23b08a9a9dd001010f0ee6b1ee83a45 (diff) | |
download | linux-ebd0cb1af3be2729cc1f574681dfba01fcf458d9.tar.xz |
[PATCH] knfsd: Unexport cache_fresh and fix a small race
Cache_fresh is now only used in cache.c, so unexport it.
Part of cache_fresh (setting CACHE_VALID) should really be done under the
lock, while part (calling cache_revisit_request etc) must be done outside the
lock. So we split it up appropriately.
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'net/sunrpc/cache.c')
-rw-r--r-- | net/sunrpc/cache.c | 51 |
1 files changed, 30 insertions, 21 deletions
diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c index b242f49..edcda4f 100644 --- a/net/sunrpc/cache.c +++ b/net/sunrpc/cache.c @@ -96,6 +96,27 @@ struct cache_head *sunrpc_cache_lookup(struct cache_detail *detail, } EXPORT_SYMBOL(sunrpc_cache_lookup); + +static void queue_loose(struct cache_detail *detail, struct cache_head *ch); + +static int cache_fresh_locked(struct cache_head *head, time_t expiry) +{ + head->expiry_time = expiry; + head->last_refresh = get_seconds(); + return !test_and_set_bit(CACHE_VALID, &head->flags); +} + +static void cache_fresh_unlocked(struct cache_head *head, + struct cache_detail *detail, int new) +{ + if (new) + cache_revisit_request(head); + if (test_and_clear_bit(CACHE_PENDING, &head->flags)) { + cache_revisit_request(head); + queue_loose(detail, head); + } +} + struct cache_head *sunrpc_cache_update(struct cache_detail *detail, struct cache_head *new, struct cache_head *old, int hash) { @@ -105,6 +126,7 @@ struct cache_head *sunrpc_cache_update(struct cache_detail *detail, */ struct cache_head **head; struct cache_head *tmp; + int is_new; if (!test_bit(CACHE_VALID, &old->flags)) { write_lock(&detail->hash_lock); @@ -113,9 +135,9 @@ struct cache_head *sunrpc_cache_update(struct cache_detail *detail, set_bit(CACHE_NEGATIVE, &old->flags); else detail->update(old, new); - /* FIXME cache_fresh should come first */ + is_new = cache_fresh_locked(old, new->expiry_time); write_unlock(&detail->hash_lock); - cache_fresh(detail, old, new->expiry_time); + cache_fresh_unlocked(old, detail, is_new); return old; } write_unlock(&detail->hash_lock); @@ -138,9 +160,11 @@ struct cache_head *sunrpc_cache_update(struct cache_detail *detail, tmp->next = *head; *head = tmp; cache_get(tmp); + is_new = cache_fresh_locked(tmp, new->expiry_time); + cache_fresh_locked(old, 0); write_unlock(&detail->hash_lock); - cache_fresh(detail, tmp, new->expiry_time); - cache_fresh(detail, old, 0); + cache_fresh_unlocked(tmp, detail, is_new); + cache_fresh_unlocked(old, detail, 0); detail->cache_put(old, detail); return tmp; } @@ -192,7 +216,8 @@ int cache_check(struct cache_detail *detail, clear_bit(CACHE_PENDING, &h->flags); if (rv == -EAGAIN) { set_bit(CACHE_NEGATIVE, &h->flags); - cache_fresh(detail, h, get_seconds()+CACHE_NEW_EXPIRY); + cache_fresh_unlocked(h, detail, + cache_fresh_locked(h, get_seconds()+CACHE_NEW_EXPIRY)); rv = -ENOENT; } break; @@ -213,22 +238,6 @@ int cache_check(struct cache_detail *detail, return rv; } -static void queue_loose(struct cache_detail *detail, struct cache_head *ch); - -void cache_fresh(struct cache_detail *detail, - struct cache_head *head, time_t expiry) -{ - - head->expiry_time = expiry; - head->last_refresh = get_seconds(); - if (!test_and_set_bit(CACHE_VALID, &head->flags)) - cache_revisit_request(head); - if (test_and_clear_bit(CACHE_PENDING, &head->flags)) { - cache_revisit_request(head); - queue_loose(detail, head); - } -} - /* * caches need to be periodically cleaned. * For this we maintain a list of cache_detail and |