[PATCH 10/13] nfsd: store export path in export

[J. Bruce Fields]

From: J. Bruce Fields <bfields at fieldses.org>

Store the export path in the svc_export structure instead of storing only
the dentry.  This will prevent the need for additional d_path calls to
provide NFSv4 fs_locations support.

Signed-off-by: J. Bruce Fields <bfields at citi.umich.edu>
---

 fs/nfsd/export.c            |    8 ++++++++
 include/linux/nfsd/export.h |    1 +
 2 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/fs/nfsd/export.c b/fs/nfsd/export.c
index 83b405e..1016d48 100644
--- a/fs/nfsd/export.c
+++ b/fs/nfsd/export.c
@@ -325,6 +325,7 @@ static void svc_export_put(struct kref *
 	dput(exp->ex_dentry);
 	mntput(exp->ex_mnt);
 	auth_domain_put(exp->ex_client);
+	kfree(exp->ex_path);
 	kfree(exp);
 }
 
@@ -428,6 +429,9 @@ static int svc_export_parse(struct cache
 	exp.ex_client = dom;
 	exp.ex_mnt = nd.mnt;
 	exp.ex_dentry = nd.dentry;
+	exp.ex_path = kstrdup(buf, GFP_KERNEL);
+	if (!exp.ex_path)
+		goto out;
 
 	/* expiry */
 	err = -EINVAL;
@@ -473,6 +477,7 @@ static int svc_export_parse(struct cache
 	else
 		exp_put(expp);
  out:
+ 	kfree(exp.ex_path);
 	if (nd.dentry)
 		path_release(&nd);
  out_no_path:
@@ -524,6 +529,7 @@ static void svc_export_init(struct cache
 	new->ex_client = item->ex_client;
 	new->ex_dentry = dget(item->ex_dentry);
 	new->ex_mnt = mntget(item->ex_mnt);
+	new->ex_path = NULL;
 }
 
 static void export_update(struct cache_head *cnew, struct cache_head *citem)
@@ -535,6 +541,8 @@ static void export_update(struct cache_h
 	new->ex_anon_uid = item->ex_anon_uid;
 	new->ex_anon_gid = item->ex_anon_gid;
 	new->ex_fsid = item->ex_fsid;
+	new->ex_path = item->ex_path;
+	item->ex_path = NULL;
 }
 
 static struct cache_head *svc_export_alloc(void)
diff --git a/include/linux/nfsd/export.h b/include/linux/nfsd/export.h
index d2a8abb..47d9668 100644
--- a/include/linux/nfsd/export.h
+++ b/include/linux/nfsd/export.h
@@ -51,6 +51,7 @@ struct svc_export {
 	int			ex_flags;
 	struct vfsmount *	ex_mnt;
 	struct dentry *		ex_dentry;
+	char *			ex_path;
 	uid_t			ex_anon_uid;
 	gid_t			ex_anon_gid;
 	int			ex_fsid;