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nfsd: hold nfsd_mutex across entire netlink operation

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Rather than using svc_get() and svc_put() to hold a stable reference to
the nfsd_svc for netlink lookups, simply hold the mutex for the entire
time.

The "entire" time isn't very long, and the mutex is not often contented.

This makes way for us to remove the refcounts of svc, which is more
confusing than useful.

Reported-by: Jeff Layton <jlayton@kernel.org>
Closes: https://lore.kernel.org/linux-nfs/5d9bbb599569ce29f16e4e0eef6b291eda0f375b.camel@kernel.org/T/#u
Fixes: bd9d6a3efa ("NFSD: add rpc_status netlink support")
Signed-off-by: NeilBrown <neilb@suse.de>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
NeilBrown 2023-12-15 11:56:33 +11:00 committed by Chuck Lever
parent 2a501f55cd
commit 1bd773b4f0
1 changed files with 3 additions and 6 deletions
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9
fs/nfsd/nfsctl.c
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@ -1515,11 +1515,10 @@ int nfsd_nl_rpc_status_get_start(struct netlink_callback *cb)
int ret = -ENODEV;
mutex_lock(&nfsd_mutex);
if (nn->nfsd_serv) {
svc_get(nn->nfsd_serv);
if (nn->nfsd_serv)
ret = 0;
}
mutex_unlock(&nfsd_mutex);
else
mutex_unlock(&nfsd_mutex);
return ret;
}
@ -1691,8 +1690,6 @@ out:
*/
int nfsd_nl_rpc_status_get_done(struct netlink_callback *cb)
{
mutex_lock(&nfsd_mutex);
nfsd_put(sock_net(cb->skb->sk));
mutex_unlock(&nfsd_mutex);
return 0;