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nfsd: always move DRC entries to the end of LRU list when updating timestamp 

...otherwise, we end up with the list ordering wrong. Currently, it's
not a problem since we skip RC_INPROG entries, but keeping the ordering
strict will be necessary for a later patch that adds a cache cleaner.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Jeff Layton 2013-02-04 08:18:00 -05:00 committed by J. Bruce Fields
parent 2eeb9b2abc
commit 56c2548b2d
1 changed files with 2 additions and 3 deletions
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5
fs/nfsd/nfscache.c
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@ -129,6 +129,7 @@ void nfsd_reply_cache_shutdown(void)
static void
lru_put_end(struct svc_cacherep *rp)
{
rp->c_timestamp = jiffies;
list_move_tail(&rp->c_lru, &lru_head);
}
@ -245,9 +246,9 @@ nfsd_cache_lookup(struct svc_rqst *rqstp)
rpc_set_port((struct sockaddr *)&rp->c_addr, rpc_get_port(svc_addr(rqstp)));
rp->c_prot = proto;
rp->c_vers = vers;
rp->c_timestamp = jiffies;
hash_refile(rp);
lru_put_end(rp);
/* release any buffer */
if (rp->c_type == RC_REPLBUFF) {
@ -262,7 +263,6 @@ nfsd_cache_lookup(struct svc_rqst *rqstp)
found_entry:
/* We found a matching entry which is either in progress or done. */
age = jiffies - rp->c_timestamp;
rp->c_timestamp = jiffies;
lru_put_end(rp);
rtn = RC_DROPIT;
@ -354,7 +354,6 @@ nfsd_cache_update(struct svc_rqst *rqstp, int cachetype, __be32 *statp)
rp->c_secure = rqstp->rq_secure;
rp->c_type = cachetype;
rp->c_state = RC_DONE;
rp->c_timestamp = jiffies;
spin_unlock(&cache_lock);
return;
}