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Commit 59deeb9e authored by J. Bruce Fields's avatar J. Bruce Fields
Browse files

nfsd4: reduce do_open_lookup() stack usage 



I get 320 bytes for struct svc_fh on x86_64, really a little large to be
putting on the stack; kmalloc() instead.

Signed-off-by: default avatarJ. Bruce Fields <bfields@redhat.com>
parent 41fd1e42

fs/nfsd/nfs4proc.c

+14 −10
Original line number Diff line number Diff line
@@ -193,10 +193,13 @@ static __be32 nfsd_check_obj_isreg(struct svc_fh *fh) 
static __be32

do_open_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)

{

	struct svc_fh resfh;

	struct svc_fh *resfh;

	__be32 status;



	fh_init(&resfh, NFS4_FHSIZE);

	resfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);

	if (!resfh)

		return nfserr_jukebox;

	fh_init(resfh, NFS4_FHSIZE);

	open->op_truncate = 0;



	if (open->op_create) {
@@ -221,7 +224,7 @@ do_open_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_o 
		 */

		status = do_nfsd_create(rqstp, current_fh, open->op_fname.data,

					open->op_fname.len, &open->op_iattr,

					&resfh, open->op_createmode,

					resfh, open->op_createmode,

					(u32 *)open->op_verf.data,

					&open->op_truncate, &open->op_created);
@@ -235,28 +238,29 @@ do_open_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_o 
						FATTR4_WORD1_TIME_MODIFY);

	} else {

		status = nfsd_lookup(rqstp, current_fh,

				     open->op_fname.data, open->op_fname.len, &resfh);

				     open->op_fname.data, open->op_fname.len, resfh);

		fh_unlock(current_fh);

		if (status)

			goto out;

		status = nfsd_check_obj_isreg(&resfh);

		status = nfsd_check_obj_isreg(resfh);

	}

	if (status)

		goto out;



	if (is_create_with_attrs(open) && open->op_acl != NULL)

		do_set_nfs4_acl(rqstp, &resfh, open->op_acl, open->op_bmval);

		do_set_nfs4_acl(rqstp, resfh, open->op_acl, open->op_bmval);



	/* set reply cache */

	fh_copy_shallow(&open->op_openowner->oo_owner.so_replay.rp_openfh,

			&resfh.fh_handle);

			&resfh->fh_handle);

	if (!open->op_created)

		status = do_open_permission(rqstp, &resfh, open,

		status = do_open_permission(rqstp, resfh, open,

					    NFSD_MAY_NOP);

	set_change_info(&open->op_cinfo, current_fh);

	fh_dup2(current_fh, &resfh);

	fh_dup2(current_fh, resfh);

out:

	fh_put(&resfh);

	fh_put(resfh);

	kfree(resfh);

	return status;

}