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Commit 761fe93c authored by Trond Myklebust's avatar Trond Myklebust
Browse files

NFS: Fix the locking in nfs4_callback_getattr 



The delegation is protected by RCU now, so we need to replace the
nfsi->rwsem protection with an rcu protected section.

Reported-by: default avatarFred Isaman <iisaman@netapp.com>
Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
parent 0d8a3746

fs/nfs/callback_proc.c

+3 −3
Original line number Diff line number Diff line
@@ -37,8 +37,8 @@ __be32 nfs4_callback_getattr(struct cb_getattrargs *args, struct cb_getattrres * 
	if (inode == NULL)

		goto out_putclient;

	nfsi = NFS_I(inode);

	down_read(&nfsi->rwsem);

	delegation = nfsi->delegation;

	rcu_read_lock();

	delegation = rcu_dereference(nfsi->delegation);

	if (delegation == NULL || (delegation->type & FMODE_WRITE) == 0)

		goto out_iput;

	res->size = i_size_read(inode);
@@ -53,7 +53,7 @@ __be32 nfs4_callback_getattr(struct cb_getattrargs *args, struct cb_getattrres * 
		args->bitmap[1];

	res->status = 0;

out_iput:

	up_read(&nfsi->rwsem);

	rcu_read_unlock();

	iput(inode);

out_putclient:

	nfs_put_client(clp);