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authorStanislav Kinsbursky <skinsbursky@parallels.com>2012-04-28 19:32:21 +0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2012-04-28 13:22:19 -0400
commit71dfc5fa5160bb73752f0731539404569a77faca (patch)
treed35919ad0d645b91404ca0d1717e5ffa00e89ae5
parente245d4250d0326cfcf7c816a2081b6ab2ea810be (diff)
NFS: get module in idmap PipeFS notifier callback
This is bug fix. Notifier callback is called from SUNRPC module. So before dereferencing NFS module we have to make sure, that it's alive. Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
-rw-r--r--fs/nfs/idmap.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/nfs/idmap.c b/fs/nfs/idmap.c
index b7f348bb618b..ba3019f5934c 100644
--- a/fs/nfs/idmap.c
+++ b/fs/nfs/idmap.c
@@ -554,12 +554,16 @@ static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event,
struct nfs_client *clp;
int error = 0;
+ if (!try_module_get(THIS_MODULE))
+ return 0;
+
while ((clp = nfs_get_client_for_event(sb->s_fs_info, event))) {
error = __rpc_pipefs_event(clp, event, sb);
nfs_put_client(clp);
if (error)
break;
}
+ module_put(THIS_MODULE);
return error;
}