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nfsd: export upcalls must not return ESTALE when mountd is down

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If the rpc.mountd daemon goes down, then that should not cause all
exports to start failing with ESTALE errors. Let's explicitly
distinguish between the cache upcall cases that need to time out,
and those that do not.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Trond Myklebust
2020-03-01 18:21:42 -05:00
committed by Chuck Lever
parent 6a30e47fa0
commit 65286b883c
7 changed files with 85 additions and 32 deletions
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53
net/sunrpc/cache.c
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@@ -38,7 +38,6 @@
static bool cache_defer_req(struct cache_req *req, struct cache_head *item);
static void cache_revisit_request(struct cache_head *item);
static bool cache_listeners_exist(struct cache_detail *detail);
static void cache_init(struct cache_head *h, struct cache_detail *detail)
{
@@ -225,13 +224,6 @@ struct cache_head *sunrpc_cache_update(struct cache_detail *detail,
}
EXPORT_SYMBOL_GPL(sunrpc_cache_update);
static int cache_make_upcall(struct cache_detail *cd, struct cache_head *h)
{
if (cd->cache_upcall)
return cd->cache_upcall(cd, h);
return sunrpc_cache_pipe_upcall(cd, h);
}
static inline int cache_is_valid(struct cache_head *h)
{
if (!test_bit(CACHE_VALID, &h->flags))
@@ -304,17 +296,14 @@ int cache_check(struct cache_detail *detail,
(h->expiry_time != 0 && age > refresh_age/2)) {
dprintk("RPC: Want update, refage=%lld, age=%lld\n",
refresh_age, age);
if (!test_and_set_bit(CACHE_PENDING, &h->flags)) {
switch (cache_make_upcall(detail, h)) {
case -EINVAL:
rv = try_to_negate_entry(detail, h);
break;
case -EAGAIN:
cache_fresh_unlocked(h, detail);
break;
}
} else if (!cache_listeners_exist(detail))
switch (detail->cache_upcall(detail, h)) {
case -EINVAL:
rv = try_to_negate_entry(detail, h);
break;
case -EAGAIN:
cache_fresh_unlocked(h, detail);
break;
}
}
if (rv == -EAGAIN) {
@@ -1196,20 +1185,12 @@ static bool cache_listeners_exist(struct cache_detail *detail)
*
* Each request is at most one page long.
*/
int sunrpc_cache_pipe_upcall(struct cache_detail *detail, struct cache_head *h)
static int cache_pipe_upcall(struct cache_detail *detail, struct cache_head *h)
{
char *buf;
struct cache_request *crq;
int ret = 0;
if (!detail->cache_request)
return -EINVAL;
if (!cache_listeners_exist(detail)) {
warn_no_listener(detail);
return -EINVAL;
}
if (test_bit(CACHE_CLEANED, &h->flags))
/* Too late to make an upcall */
return -EAGAIN;
@@ -1243,8 +1224,26 @@ int sunrpc_cache_pipe_upcall(struct cache_detail *detail, struct cache_head *h)
}
return ret;
}
int sunrpc_cache_pipe_upcall(struct cache_detail *detail, struct cache_head *h)
{
if (test_and_set_bit(CACHE_PENDING, &h->flags))
return 0;
return cache_pipe_upcall(detail, h);
}
EXPORT_SYMBOL_GPL(sunrpc_cache_pipe_upcall);
int sunrpc_cache_pipe_upcall_timeout(struct cache_detail *detail,
struct cache_head *h)
{
if (!cache_listeners_exist(detail)) {
warn_no_listener(detail);
return -EINVAL;
}
return sunrpc_cache_pipe_upcall(detail, h);
}
EXPORT_SYMBOL_GPL(sunrpc_cache_pipe_upcall_timeout);
/*
* parse a message from user-space and pass it
* to an appropriate cache