@@ -224,13 +224,6 @@ 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.
@@ -242,8 +235,14 @@ prune_cache_entries(void)
long freed = 0;
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);
freed++;
This is a note to let you know that I have just added a patch titled nfsd: don't halt scanning the DRC LRU list when there's an RC_INPROG entry to the linux-3.13.y-queue branch of the 3.13.y-ckt extended stable tree which can be found at: http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.13.y-queue This patch is scheduled to be released in version 3.13.11-ckt12. If you, or anyone else, feels it should not be added to this tree, please reply to this email. For more information about the 3.13.y-ckt tree, see https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable Thanks. -Kamal ------ From cb1df169719560bba386436e3a3d895d376da350 Mon Sep 17 00:00:00 2001 From: Jeff Layton <jlayton@primarydata.com> Date: Thu, 5 Jun 2014 09:45:00 -0400 Subject: 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> Cc: Joseph Salisbury <joseph.salisbury@canonical.com> Reference: http://bugs.launchpad.net/bugs/1396065 Signed-off-by: Kamal Mostafa <kamal@canonical.com> --- fs/nfsd/nfscache.c | 17 ++++++++--------- 1 file changed, 8 insertions(+), 9 deletions(-) -- 1.9.1