diff options
author | Trond Myklebust <trondmy@gmail.com> | 2020-01-06 19:40:35 +0100 |
---|---|---|
committer | J. Bruce Fields <bfields@redhat.com> | 2020-01-22 22:25:41 +0100 |
commit | 809fe3c533789ebb51c1873b80c7dafbad9dbf19 (patch) | |
tree | 9fb6f44f790f58d9416a0403f8c1fa67d1695d30 /net/sunrpc | |
parent | sunrpc: Fix potential leaks in sunrpc_cache_unhash() (diff) | |
download | linux-809fe3c533789ebb51c1873b80c7dafbad9dbf19.tar.xz linux-809fe3c533789ebb51c1873b80c7dafbad9dbf19.zip |
sunrpc: clean up cache entry add/remove from hashtable
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'net/sunrpc')
-rw-r--r-- | net/sunrpc/cache.c | 50 |
1 files changed, 26 insertions, 24 deletions
diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c index 7ede1e52fd81..52d927210d32 100644 --- a/net/sunrpc/cache.c +++ b/net/sunrpc/cache.c @@ -77,6 +77,22 @@ static struct cache_head *sunrpc_cache_find_rcu(struct cache_detail *detail, return NULL; } +static void sunrpc_begin_cache_remove_entry(struct cache_head *ch, + struct cache_detail *cd) +{ + /* Must be called under cd->hash_lock */ + hlist_del_init_rcu(&ch->cache_list); + set_bit(CACHE_CLEANED, &ch->flags); + cd->entries --; +} + +static void sunrpc_end_cache_remove_entry(struct cache_head *ch, + struct cache_detail *cd) +{ + cache_fresh_unlocked(ch, cd); + cache_put(ch, cd); +} + static struct cache_head *sunrpc_cache_add_entry(struct cache_detail *detail, struct cache_head *key, int hash) @@ -100,8 +116,7 @@ static struct cache_head *sunrpc_cache_add_entry(struct cache_detail *detail, hlist_for_each_entry_rcu(tmp, head, cache_list) { if (detail->match(tmp, key)) { if (cache_is_expired(detail, tmp)) { - hlist_del_init_rcu(&tmp->cache_list); - detail->entries --; + sunrpc_begin_cache_remove_entry(tmp, detail); freeme = tmp; break; } @@ -117,10 +132,8 @@ static struct cache_head *sunrpc_cache_add_entry(struct cache_detail *detail, cache_get(new); spin_unlock(&detail->hash_lock); - if (freeme) { - cache_fresh_unlocked(freeme, detail); - cache_put(freeme, detail); - } + if (freeme) + sunrpc_end_cache_remove_entry(freeme, detail); return new; } @@ -454,8 +467,7 @@ static int cache_clean(void) if (!cache_is_expired(current_detail, ch)) continue; - hlist_del_init_rcu(&ch->cache_list); - current_detail->entries--; + sunrpc_begin_cache_remove_entry(ch, current_detail); rv = 1; break; } @@ -465,11 +477,8 @@ static int cache_clean(void) if (!ch) current_index ++; spin_unlock(&cache_list_lock); - if (ch) { - set_bit(CACHE_CLEANED, &ch->flags); - cache_fresh_unlocked(ch, d); - cache_put(ch, d); - } + if (ch) + sunrpc_end_cache_remove_entry(ch, d); } else spin_unlock(&cache_list_lock); @@ -525,13 +534,9 @@ void cache_purge(struct cache_detail *detail) for (i = 0; i < detail->hash_size; i++) { head = &detail->hash_table[i]; hlist_for_each_entry_safe(ch, tmp, head, cache_list) { - hlist_del_init_rcu(&ch->cache_list); - detail->entries--; - - set_bit(CACHE_CLEANED, &ch->flags); + sunrpc_begin_cache_remove_entry(ch, detail); spin_unlock(&detail->hash_lock); - cache_fresh_unlocked(ch, detail); - cache_put(ch, detail); + sunrpc_end_cache_remove_entry(ch, detail); spin_lock(&detail->hash_lock); } } @@ -1886,12 +1891,9 @@ void sunrpc_cache_unhash(struct cache_detail *cd, struct cache_head *h) { spin_lock(&cd->hash_lock); if (!hlist_unhashed(&h->cache_list)){ - hlist_del_init_rcu(&h->cache_list); - cd->entries--; - set_bit(CACHE_CLEANED, &h->flags); + sunrpc_begin_cache_remove_entry(h, cd); spin_unlock(&cd->hash_lock); - cache_fresh_unlocked(h, cd); - cache_put(h, cd); + sunrpc_end_cache_remove_entry(h, cd); } else spin_unlock(&cd->hash_lock); } |