[PATCH 06/15] NFSv4: Introduce new label structure

[Steve Dickson <SteveD@redhat.com>]

From: David Quigley <dpquigl@davequigley.com>

In order to mimic the way that NFSv4 ACLs are implemented we have created a
structure to be used to pass label data up and down the call chain. This patch
adds the new structure and new members to the required NFSv4 call structures.

Signed-off-by: Matthew N. Dodd <Matthew.Dodd@sparta.com>
Signed-off-by: Miguel Rodel Felipe <Rodel_FM@dsi.a-star.edu.sg>
Signed-off-by: Phua Eu Gene <PHUA_Eu_Gene@dsi.a-star.edu.sg>
Signed-off-by: Khin Mi Mi Aung <Mi_Mi_AUNG@dsi.a-star.edu.sg>
---
 fs/nfs/inode.c            | 33 +++++++++++++++++++++++++++++++++
 include/linux/nfs4.h      |  7 +++++++
 include/linux/nfs_fs.h    | 17 +++++++++++++++++
 include/linux/nfs_xdr.h   | 21 +++++++++++++++++++++
 include/uapi/linux/nfs4.h |  2 +-
 5 files changed, 79 insertions(+), 1 deletion(-)

diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index ebeb94c..8d5f01b 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -255,6 +255,39 @@ nfs_init_locked(struct inode *inode, void *opaque)
 	return 0;
 }
 
+#ifdef CONFIG_NFS_V4_SECURITY_LABEL
+struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags)
+{
+	struct nfs4_label *label = NULL;
+
+	if (!(server->caps & NFS_CAP_SECURITY_LABEL))
+		return label;
+
+	label = kzalloc(NFS4_MAXLABELLEN, flags);
+	if (label == NULL)
+		return ERR_PTR(-ENOMEM);
+
+	label->label = (char *)(label + 1);
+	label->len = NFS4_MAXLABELLEN;
+
+	return label;
+}
+EXPORT_SYMBOL_GPL(nfs4_label_alloc);
+
+void nfs4_label_init(struct nfs4_label *label)
+{
+	if (label && label->label) {
+		/* 0 is the null format meaning that the data is not
+		to be translated */
+		label->lfs = 0;
+		label->pi = 0;
+		label->len = NFS4_MAXLABELLEN;
+	}
+	return;
+}
+EXPORT_SYMBOL_GPL(nfs4_label_init);
+#endif
+
 /*
  * This is our front-end to iget that looks up inodes by file handle
  * instead of inode number.
diff --git a/include/linux/nfs4.h b/include/linux/nfs4.h
index f9235b4..aab8bd8 100644
--- a/include/linux/nfs4.h
+++ b/include/linux/nfs4.h
@@ -28,6 +28,13 @@ struct nfs4_acl {
 	struct nfs4_ace	aces[0];
 };
 
+struct nfs4_label {
+	uint32_t	lfs;
+	uint32_t	pi;
+	u32		len;
+	char	*label;
+};
+
 typedef struct { char data[NFS4_VERIFIER_SIZE]; } nfs4_verifier;
 
 struct nfs_stateid4 {
diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h
index 1cc2568..1c55373 100644
--- a/include/linux/nfs_fs.h
+++ b/include/linux/nfs_fs.h
@@ -489,6 +489,23 @@ extern int nfs_mountpoint_expiry_timeout;
 extern void nfs_release_automount_timer(void);
 
 /*
+ * linux/fs/nfs/nfs4proc.c
+ */
+#ifdef CONFIG_NFS_V4_SECURITY_LABEL
+extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags);
+extern void nfs4_label_init(struct nfs4_label *label);
+static inline void nfs4_label_free(struct nfs4_label *label)
+{
+	kfree(label);
+	return;
+}
+#else
+static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; }
+static inline void nfs4_label_init(void *label) {}
+static inline void nfs4_label_free(void *label) {}
+#endif
+
+/*
  * linux/fs/nfs/unlink.c
  */
 extern void nfs_complete_unlink(struct dentry *dentry, struct inode *);
diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index ac9ba69..7e86290 100644
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -350,6 +350,7 @@ struct nfs_openargs {
 	const u32 *		bitmask;
 	const u32 *		open_bitmap;
 	__u32			claim;
+	const struct nfs4_label *label;
 };
 
 struct nfs_openres {
@@ -359,6 +360,7 @@ struct nfs_openres {
 	struct nfs4_change_info	cinfo;
 	__u32                   rflags;
 	struct nfs_fattr *      f_attr;
+	struct nfs4_label	*f_label;
 	struct nfs_seqid *	seqid;
 	const struct nfs_server *server;
 	fmode_t			delegation_type;
@@ -403,6 +405,7 @@ struct nfs_closeres {
 	struct nfs4_sequence_res	seq_res;
 	nfs4_stateid            stateid;
 	struct nfs_fattr *	fattr;
+	struct nfs4_label	*label;
 	struct nfs_seqid *	seqid;
 	const struct nfs_server *server;
 };
@@ -476,6 +479,7 @@ struct nfs4_delegreturnargs {
 struct nfs4_delegreturnres {
 	struct nfs4_sequence_res	seq_res;
 	struct nfs_fattr * fattr;
+	struct nfs4_label	*label;
 	const struct nfs_server *server;
 };
 
@@ -496,6 +500,7 @@ struct nfs_readargs {
 struct nfs_readres {
 	struct nfs4_sequence_res	seq_res;
 	struct nfs_fattr *	fattr;
+	struct nfs4_label	*label;
 	__u32			count;
 	int                     eof;
 };
@@ -564,6 +569,7 @@ struct nfs_removeres {
 	struct nfs4_sequence_res 	seq_res;
 	const struct nfs_server *server;
 	struct nfs_fattr	*dir_attr;
+	struct nfs4_label	*dir_label;
 	struct nfs4_change_info	cinfo;
 };
 
@@ -576,6 +582,8 @@ struct nfs_renameargs {
 	const struct nfs_fh		*new_dir;
 	const struct qstr		*old_name;
 	const struct qstr		*new_name;
+	const struct nfs4_label		*old_label;
+	const struct nfs4_label		*new_label;
 };
 
 struct nfs_renameres {
@@ -583,8 +591,10 @@ struct nfs_renameres {
 	const struct nfs_server		*server;
 	struct nfs4_change_info		old_cinfo;
 	struct nfs_fattr		*old_fattr;
+	struct nfs4_label		*old_label;
 	struct nfs4_change_info		new_cinfo;
 	struct nfs_fattr		*new_fattr;
+	struct nfs4_label		*new_label;
 };
 
 /*
@@ -599,6 +609,7 @@ struct nfs_entry {
 	int			eof;
 	struct nfs_fh *		fh;
 	struct nfs_fattr *	fattr;
+	struct nfs4_label  *label;
 	unsigned char		d_type;
 	struct nfs_server *	server;
 };
@@ -631,6 +642,7 @@ struct nfs_setattrargs {
 	struct iattr *                  iap;
 	const struct nfs_server *	server; /* Needed for name mapping */
 	const u32 *			bitmask;
+	const struct nfs4_label		*label;
 };
 
 struct nfs_setaclargs {
@@ -666,6 +678,7 @@ struct nfs_getaclres {
 struct nfs_setattrres {
 	struct nfs4_sequence_res	seq_res;
 	struct nfs_fattr *              fattr;
+	struct nfs4_label		*label;
 	const struct nfs_server *	server;
 };
 
@@ -711,6 +724,7 @@ struct nfs3_setaclargs {
 struct nfs_diropok {
 	struct nfs_fh *		fh;
 	struct nfs_fattr *	fattr;
+	struct nfs4_label	*label;
 };
 
 struct nfs_readlinkargs {
@@ -841,6 +855,7 @@ struct nfs4_accessres {
 	struct nfs4_sequence_res	seq_res;
 	const struct nfs_server *	server;
 	struct nfs_fattr *		fattr;
+	struct nfs4_label		*label;
 	u32				supported;
 	u32				access;
 };
@@ -863,6 +878,7 @@ struct nfs4_create_arg {
 	const struct iattr *		attrs;
 	const struct nfs_fh *		dir_fh;
 	const u32 *			bitmask;
+	const struct nfs4_label		*label;
 };
 
 struct nfs4_create_res {
@@ -870,6 +886,7 @@ struct nfs4_create_res {
 	const struct nfs_server *	server;
 	struct nfs_fh *			fh;
 	struct nfs_fattr *		fattr;
+	struct nfs4_label		*label;
 	struct nfs4_change_info		dir_cinfo;
 };
 
@@ -894,6 +911,7 @@ struct nfs4_getattr_res {
 	struct nfs4_sequence_res	seq_res;
 	const struct nfs_server *	server;
 	struct nfs_fattr *		fattr;
+	struct nfs4_label		*label;
 };
 
 struct nfs4_link_arg {
@@ -908,8 +926,10 @@ struct nfs4_link_res {
 	struct nfs4_sequence_res	seq_res;
 	const struct nfs_server *	server;
 	struct nfs_fattr *		fattr;
+	struct nfs4_label		*label;
 	struct nfs4_change_info		cinfo;
 	struct nfs_fattr *		dir_attr;
+	struct nfs4_label		*dir_label;
 };
 
 
@@ -925,6 +945,7 @@ struct nfs4_lookup_res {
 	const struct nfs_server *	server;
 	struct nfs_fattr *		fattr;
 	struct nfs_fh *			fh;
+	struct nfs4_label		*label;
 };
 
 struct nfs4_lookup_root_arg {
diff --git a/include/uapi/linux/nfs4.h b/include/uapi/linux/nfs4.h
index 788128e..b8014a2 100644
--- a/include/uapi/linux/nfs4.h
+++ b/include/uapi/linux/nfs4.h
@@ -25,7 +25,7 @@
 #define NFS4_MAXNAMLEN		NAME_MAX
 #define NFS4_OPAQUE_LIMIT	1024
 #define NFS4_MAX_SESSIONID_LEN	16
-
+#define NFS4_MAXLABELLEN (4095 - offsetof(struct nfs4_label , label))
 #define NFS4_ACCESS_READ        0x0001
 #define NFS4_ACCESS_LOOKUP      0x0002
 #define NFS4_ACCESS_MODIFY      0x0004
-- 
1.7.11.7