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Commit fe08c546 authored by Peng Tao's avatar Peng Tao Committed by Trond Myklebust
Browse files

nfs41: return layout on last close 



If client has valid delegation, do not return layout on close at all.

Signed-off-by: default avatarPeng Tao <tao.peng@primarydata.com>
Signed-off-by: default avatarTrond Myklebust <trond.myklebust@primarydata.com>
parent 15bb3afe

fs/nfs/nfs4proc.c

+43 −1
Original line number Diff line number Diff line
@@ -2655,6 +2655,48 @@ static const struct rpc_call_ops nfs4_close_ops = { 
	.rpc_release = nfs4_free_closedata,

};



static bool nfs4_state_has_opener(struct nfs4_state *state)

{

	/* first check existing openers */

	if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0 &&

	    state->n_rdonly != 0)

		return true;



	if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0 &&

	    state->n_wronly != 0)

		return true;



	if (test_bit(NFS_O_RDWR_STATE, &state->flags) != 0 &&

	    state->n_rdwr != 0)

		return true;



	return false;

}



static bool nfs4_roc(struct inode *inode)

{

	struct nfs_inode *nfsi = NFS_I(inode);

	struct nfs_open_context *ctx;

	struct nfs4_state *state;



	spin_lock(&inode->i_lock);

	list_for_each_entry(ctx, &nfsi->open_files, list) {

		state = ctx->state;

		if (state == NULL)

			continue;

		if (nfs4_state_has_opener(state)) {

			spin_unlock(&inode->i_lock);

			return false;

		}

	}

	spin_unlock(&inode->i_lock);



	if (nfs4_check_delegation(inode, FMODE_READ))

		return false;



	return pnfs_roc(inode);

}



/* 

 * It is possible for data to be read/written from a mem-mapped file 

 * after the sys_close call (which hits the vfs layer as a flush).
@@ -2705,7 +2747,7 @@ int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait) 
	calldata->res.fattr = &calldata->fattr;

	calldata->res.seqid = calldata->arg.seqid;

	calldata->res.server = server;

	calldata->roc = pnfs_roc(state->inode);

	calldata->roc = nfs4_roc(state->inode);

	nfs_sb_active(calldata->inode->i_sb);



	msg.rpc_argp = &calldata->arg;