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: J. Bruce Fields <bfields@redhat.com>
diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index bdb71a5..abe808a 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -193,10 +193,13 @@
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 @@
*/
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 @@
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;
}