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Commit 02a3508d authored by Trond Myklebust's avatar Trond Myklebust Committed by J. Bruce Fields
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nfsd: Convert delegation counter to an atomic_long_t type 



We want to convert to an atomic type so that we don't need to lock
across the call to alloc_init_deleg(). Then convert to a long type so
that we match the size of 'max_delegations'.

None of this is a problem today, but it will be once we remove
client_mutex protection.

Signed-off-by: default avatarTrond Myklebust <trond.myklebust@primarydata.com>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarJ. Bruce Fields <bfields@redhat.com>
parent 2d4a532d

fs/nfsd/nfs4state.c

+11 −7
Original line number Diff line number Diff line
@@ -342,7 +342,7 @@ find_any_file(struct nfs4_file *f) 
	return ret;

}



static int num_delegations;

static atomic_long_t num_delegations;

unsigned long max_delegations;



/*
@@ -582,22 +582,23 @@ static struct nfs4_delegation * 
alloc_init_deleg(struct nfs4_client *clp, struct nfs4_ol_stateid *stp, struct svc_fh *current_fh)

{

	struct nfs4_delegation *dp;

	long n;



	dprintk("NFSD alloc_init_deleg\n");

	if (num_delegations > max_delegations)

		return NULL;

	n = atomic_long_inc_return(&num_delegations);

	if (n < 0 || n > max_delegations)

		goto out_dec;

	if (delegation_blocked(&current_fh->fh_handle))

		return NULL;

		goto out_dec;

	dp = delegstateid(nfs4_alloc_stid(clp, deleg_slab));

	if (dp == NULL)

		return dp;

		goto out_dec;

	/*

	 * delegation seqid's are never incremented.  The 4.1 special

	 * meaning of seqid 0 isn't meaningful, really, but let's avoid

	 * 0 anyway just for consistency and use 1:

	 */

	dp->dl_stid.sc_stateid.si_generation = 1;

	num_delegations++;

	INIT_LIST_HEAD(&dp->dl_perfile);

	INIT_LIST_HEAD(&dp->dl_perclnt);

	INIT_LIST_HEAD(&dp->dl_recall_lru);
@@ -605,6 +606,9 @@ alloc_init_deleg(struct nfs4_client *clp, struct nfs4_ol_stateid *stp, struct sv 
	fh_copy_shallow(&dp->dl_fh, &current_fh->fh_handle);

	INIT_WORK(&dp->dl_recall.cb_work, nfsd4_run_cb_recall);

	return dp;

out_dec:

	atomic_long_dec(&num_delegations);

	return NULL;

}



static void remove_stid(struct nfs4_stid *s)
@@ -627,7 +631,7 @@ nfs4_put_delegation(struct nfs4_delegation *dp) 
			put_nfs4_file(dp->dl_file);

		remove_stid(&dp->dl_stid);

		nfs4_free_stid(deleg_slab, &dp->dl_stid);

		num_delegations--;

		atomic_long_dec(&num_delegations);

	}

}