128 lines
3.4 KiB
Diff
128 lines
3.4 KiB
Diff
Patch-mainline: submitted 04aug2009
|
|
References: bnc#498708
|
|
From: NeilBrown <neilb@suse.de>
|
|
Date: Tue, 4 Aug 2009 15:06:38 +1000
|
|
Subject: [PATCH 08/12] sunrpc/cache: retry cache lookups that return -ETIMEDOUT
|
|
|
|
If cache_check returns -ETIMEDOUT, then the cache item is not
|
|
up-to-date, but there is no pending upcall.
|
|
This could mean the data is not available, or it could mean that the
|
|
good data has been stored in a new cache item.
|
|
|
|
So re-do the lookup and if that returns a new item, proceed using that
|
|
item.
|
|
|
|
Signed-off-by: NeilBrown <neilb@suse.de>
|
|
|
|
---
|
|
fs/nfsd/export.c | 18 ++++++++++++++++++
|
|
net/sunrpc/svcauth_unix.c | 23 ++++++++++++++++++++---
|
|
2 files changed, 38 insertions(+), 3 deletions(-)
|
|
|
|
--- a/fs/nfsd/export.c
|
|
+++ b/fs/nfsd/export.c
|
|
@@ -787,9 +787,18 @@ exp_find_key(svc_client *clp, int fsid_t
|
|
memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
|
|
|
|
ek = svc_expkey_lookup(&key);
|
|
+ again:
|
|
if (ek == NULL)
|
|
return ERR_PTR(-ENOMEM);
|
|
err = cache_check(&svc_expkey_cache, &ek->h, reqp);
|
|
+ if (err == -ETIMEDOUT) {
|
|
+ struct svc_expkey *prev_ek = ek;
|
|
+ ek = svc_expkey_lookup(&key);
|
|
+ if (ek != prev_ek)
|
|
+ goto again;
|
|
+ if (ek)
|
|
+ cache_put(&ek->h, &svc_expkey_cache);
|
|
+ }
|
|
if (err)
|
|
return ERR_PTR(err);
|
|
return ek;
|
|
@@ -859,9 +868,18 @@ static svc_export *exp_get_by_name(svc_c
|
|
key.ex_path = *path;
|
|
|
|
exp = svc_export_lookup(&key);
|
|
+ retry:
|
|
if (exp == NULL)
|
|
return ERR_PTR(-ENOMEM);
|
|
err = cache_check(&svc_export_cache, &exp->h, reqp);
|
|
+ if (err == -ETIMEDOUT) {
|
|
+ struct svc_export *prev_exp = exp;
|
|
+ exp = svc_export_lookup(&key);
|
|
+ if (exp != prev_exp)
|
|
+ goto retry;
|
|
+ if (exp)
|
|
+ cache_put(&exp->h, &svc_export_cache);
|
|
+ }
|
|
if (err)
|
|
return ERR_PTR(err);
|
|
return exp;
|
|
--- a/net/sunrpc/svcauth_unix.c
|
|
+++ b/net/sunrpc/svcauth_unix.c
|
|
@@ -662,13 +662,14 @@ static struct unix_gid *unix_gid_lookup(
|
|
|
|
static struct group_info *unix_gid_find(uid_t uid, struct svc_rqst *rqstp)
|
|
{
|
|
- struct unix_gid *ug;
|
|
+ struct unix_gid *ug, *prevug;
|
|
struct group_info *gi;
|
|
int ret;
|
|
|
|
ug = unix_gid_lookup(uid);
|
|
if (!ug)
|
|
return ERR_PTR(-EAGAIN);
|
|
+retry:
|
|
ret = cache_check(&unix_gid_cache, &ug->h, &rqstp->rq_chandle);
|
|
switch (ret) {
|
|
case -ENOENT:
|
|
@@ -677,6 +678,13 @@ static struct group_info *unix_gid_find(
|
|
gi = get_group_info(ug->gi);
|
|
cache_put(&ug->h, &unix_gid_cache);
|
|
return gi;
|
|
+ case -ETIMEDOUT:
|
|
+ prevug = ug;
|
|
+ ug = unix_gid_lookup(uid);
|
|
+ if (ug != prevug)
|
|
+ goto retry;
|
|
+ if (ug)
|
|
+ cache_put(&ug->h, &unix_gid_cache);
|
|
default:
|
|
return ERR_PTR(-EAGAIN);
|
|
}
|
|
@@ -687,7 +695,7 @@ svcauth_unix_set_client(struct svc_rqst
|
|
{
|
|
struct sockaddr_in *sin;
|
|
struct sockaddr_in6 *sin6, sin6_storage;
|
|
- struct ip_map *ipm;
|
|
+ struct ip_map *ipm, *prev_ipm;
|
|
struct group_info *gi;
|
|
struct svc_cred *cred = &rqstp->rq_cred;
|
|
|
|
@@ -713,14 +721,23 @@ svcauth_unix_set_client(struct svc_rqst
|
|
ipm = ip_map_lookup(rqstp->rq_server->sv_program->pg_class,
|
|
&sin6->sin6_addr);
|
|
|
|
+ retry:
|
|
if (ipm == NULL)
|
|
return SVC_DENIED;
|
|
|
|
switch (cache_check(&ip_map_cache, &ipm->h, &rqstp->rq_chandle)) {
|
|
default:
|
|
BUG();
|
|
- case -EAGAIN:
|
|
case -ETIMEDOUT:
|
|
+ prev_ipm = ipm;
|
|
+ ipm = ip_map_lookup(rqstp->rq_server->sv_program->pg_class,
|
|
+ &sin6->sin6_addr);
|
|
+ if (ipm != prev_ipm)
|
|
+ goto retry;
|
|
+ if (ipm)
|
|
+ cache_put(&ipm->h, &ip_map_cache);
|
|
+
|
|
+ case -EAGAIN:
|
|
return SVC_DROP;
|
|
case -ENOENT:
|
|
return SVC_DENIED;
|