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authorJeff Layton <jlayton@redhat.com>2013-02-04 08:18:04 -0500
committerJ. Bruce Fields <bfields@redhat.com>2013-02-04 17:19:11 -0500
commit2c6b691c05bf77c4bc7c9f1a9b6d93a160928421 (patch)
tree298eb991a69be4a86aae6c3396dec27ff0122c52 /fs/nfsd/nfscache.c
parent13cc8a78e89db0469e67ac9b3ae466b661af93fa (diff)
downloadlinux-2c6b691c05bf77c4bc7c9f1a9b6d93a160928421.tar.bz2
nfsd: when updating an entry with RC_NOCACHE, just free it
There's no need to keep entries around that we're declaring RC_NOCACHE. Ditto if there's a problem with the entry. With this change too, there's no need to test for RC_UNUSED in the search function. If the entry's in the hash table then it's either INPROG or DONE. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'fs/nfsd/nfscache.c')
-rw-r--r--fs/nfsd/nfscache.c18
1 files changed, 14 insertions, 4 deletions
diff --git a/fs/nfsd/nfscache.c b/fs/nfsd/nfscache.c
index 69d29d4ea579..e8ea785e295d 100644
--- a/fs/nfsd/nfscache.c
+++ b/fs/nfsd/nfscache.c
@@ -98,6 +98,14 @@ nfsd_reply_cache_free_locked(struct svc_cacherep *rp)
kmem_cache_free(drc_slab, rp);
}
+static void
+nfsd_reply_cache_free(struct svc_cacherep *rp)
+{
+ spin_lock(&cache_lock);
+ nfsd_reply_cache_free_locked(rp);
+ spin_unlock(&cache_lock);
+}
+
int nfsd_reply_cache_init(void)
{
drc_slab = kmem_cache_create("nfsd_drc", sizeof(struct svc_cacherep),
@@ -182,8 +190,7 @@ nfsd_cache_search(struct svc_rqst *rqstp)
rh = &cache_hash[request_hash(xid)];
hlist_for_each_entry(rp, hn, rh, c_hash) {
- if (rp->c_state != RC_UNUSED &&
- xid == rp->c_xid && proc == rp->c_proc &&
+ if (xid == rp->c_xid && proc == rp->c_proc &&
proto == rp->c_prot && vers == rp->c_vers &&
!nfsd_cache_entry_expired(rp) &&
rpc_cmp_addr(svc_addr(rqstp), (struct sockaddr *)&rp->c_addr) &&
@@ -353,7 +360,7 @@ nfsd_cache_update(struct svc_rqst *rqstp, int cachetype, __be32 *statp)
/* Don't cache excessive amounts of data and XDR failures */
if (!statp || len > (256 >> 2)) {
- rp->c_state = RC_UNUSED;
+ nfsd_reply_cache_free(rp);
return;
}
@@ -367,12 +374,15 @@ nfsd_cache_update(struct svc_rqst *rqstp, int cachetype, __be32 *statp)
cachv = &rp->c_replvec;
cachv->iov_base = kmalloc(len << 2, GFP_KERNEL);
if (!cachv->iov_base) {
- rp->c_state = RC_UNUSED;
+ nfsd_reply_cache_free(rp);
return;
}
cachv->iov_len = len << 2;
memcpy(cachv->iov_base, statp, len << 2);
break;
+ case RC_NOCACHE:
+ nfsd_reply_cache_free(rp);
+ return;
}
spin_lock(&cache_lock);
lru_put_end(rp);