nfsd: don't halt scanning the DRC LRU list when there's an RC_INPROG entry

commit 1b19453d1c6abcfa7c312ba6c9f11a277568fc94 upstream.

Currently, the DRC cache pruner will stop scanning the list when it
hits an entry that is RC_INPROG. It's possible however for a call to
take a *very* long time. In that case, we don't want it to block other
entries from being pruned if they are expired or we need to trim the
cache to get back under the limit.

Fix the DRC cache pruner to just ignore RC_INPROG entries.

Signed-off-by: Jeff Layton <jlayton@primarydata.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/nfsd/nfscache.c b/fs/nfsd/nfscache.c
index 02e8e9ad57502fa2ff294181d6f261425bbc5969..e5e4675b7e755fd5c69ea52bc194a25501ef286b 100644 (file)
--- a/fs/nfsd/nfscache.c
+++ b/fs/nfsd/nfscache.c
@@ -221,13 +221,6 @@ hash_refile(struct svc_cacherep *rp)
        hlist_add_head(&rp->c_hash, cache_hash + hash_32(rp->c_xid, maskbits));
 }
 
-static inline bool
-nfsd_cache_entry_expired(struct svc_cacherep *rp)
-{
-       return rp->c_state != RC_INPROG &&
-              time_after(jiffies, rp->c_timestamp + RC_EXPIRE);
-}
-
 /*
  * Walk the LRU list and prune off entries that are older than RC_EXPIRE.
  * Also prune the oldest ones when the total exceeds the max number of entries.
@@ -238,8 +231,14 @@ prune_cache_entries(void)
        struct svc_cacherep *rp, *tmp;
 
        list_for_each_entry_safe(rp, tmp, &lru_head, c_lru) {
-               if (!nfsd_cache_entry_expired(rp) &&
-                   num_drc_entries <= max_drc_entries)
+               /*
+                * Don't free entries attached to calls that are still
+                * in-progress, but do keep scanning the list.
+                */
+               if (rp->c_state == RC_INPROG)
+                       continue;
+               if (num_drc_entries <= max_drc_entries &&
+                   time_before(jiffies, rp->c_timestamp + RC_EXPIRE))
                        break;
                nfsd_reply_cache_free_locked(rp);
        }