[PATCH 07/13] 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          | 40 ++++++++++++++++++++++++++++++++++++++++
 fs/nfsd/xdr4.h          |  3 +++
 include/linux/nfs4.h    |  8 ++++++++
 include/linux/nfs_fs.h  | 14 ++++++++++++++
 include/linux/nfs_xdr.h | 20 ++++++++++++++++++++
 5 files changed, 85 insertions(+)

diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 5c7325c..0963ad9 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -246,6 +246,46 @@ nfs_init_locked(struct inode *inode, void *opaque)
 	return 0;
 }
 
+#ifdef CONFIG_NFS_V4_SECURITY_LABEL
+struct nfs4_label *nfs4_label_alloc(gfp_t flags)
+{
+	struct nfs4_label *label = NULL;
+
+	label = kzalloc(sizeof(struct nfs4_label) + NFS4_MAXLABELLEN, flags);
+	if (label == NULL)
+		return NULL;
+
+	label->label = (void *)(label + 1);
+	label->len = NFS4_MAXLABELLEN;
+	/* 0 is the null format meaning that the data is not to be translated */
+	label->lfs = 0;
+	label->pi = 0;
+	return label;
+}
+EXPORT_SYMBOL_GPL(nfs4_label_alloc);
+
+void nfs4_label_init(struct nfs4_label *label)
+{
+	if (label && label->label) {
+		*(unsigned char *)label->label = 0;
+		label->len = NFS4_MAXLABELLEN;
+		/* 0 is the null format meaning that the data is not
+		to be translated */
+		label->lfs = 0;
+		label->pi = 0;
+	}
+	return;
+}
+EXPORT_SYMBOL_GPL(nfs4_label_init);
+
+void nfs4_label_free(struct nfs4_label *label)
+{
+	kfree(label);
+	return;
+}
+EXPORT_SYMBOL_GPL(nfs4_label_free);
+#endif
+
 /*
  * This is our front-end to iget that looks up inodes by file handle
  * instead of inode number.
diff --git a/fs/nfsd/xdr4.h b/fs/nfsd/xdr4.h
index acd127d..ca8f30b 100644
--- a/fs/nfsd/xdr4.h
+++ b/fs/nfsd/xdr4.h
@@ -118,6 +118,7 @@ struct nfsd4_create {
 	struct iattr	cr_iattr;           /* request */
 	struct nfsd4_change_info  cr_cinfo; /* response */
 	struct nfs4_acl *cr_acl;
+	struct nfs4_label *cr_label;
 };
 #define cr_linklen	u.link.namelen
 #define cr_linkname	u.link.name
@@ -246,6 +247,7 @@ struct nfsd4_open {
 	struct nfs4_file *op_file;          /* used during processing */
 	struct nfs4_ol_stateid *op_stp;	    /* used during processing */
 	struct nfs4_acl *op_acl;
+	struct nfs4_label *op_label;
 };
 #define op_iattr	iattr
 
@@ -330,6 +332,7 @@ struct nfsd4_setattr {
 	u32		sa_bmval[3];        /* request */
 	struct iattr	sa_iattr;           /* request */
 	struct nfs4_acl *sa_acl;
+	struct nfs4_label *sa_label;
 };
 
 struct nfsd4_setclientid {
diff --git a/include/linux/nfs4.h b/include/linux/nfs4.h
index f9235b4..862471f 100644
--- a/include/linux/nfs4.h
+++ b/include/linux/nfs4.h
@@ -28,6 +28,14 @@ struct nfs4_acl {
 	struct nfs4_ace	aces[0];
 };
 
+struct nfs4_label {
+	uint32_t	lfs;
+	uint32_t	pi;
+	u32		len;
+	void		*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..37a862c 100644
--- a/include/linux/nfs_fs.h
+++ b/include/linux/nfs_fs.h
@@ -489,6 +489,20 @@ 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(gfp_t flags);
+extern void nfs4_label_init(struct nfs4_label *);
+extern void nfs4_label_free(struct nfs4_label *);
+#else
+static inline struct nfs4_label *nfs4_label_alloc(gfp_t flags) { return NULL; }
+static inline void nfs4_label_init(struct nfs4_label *) {}
+static inline void nfs4_label_free(struct nfs4_label *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 a0669d3..7e9347a 100644
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -352,6 +352,7 @@ struct nfs_openargs {
 	const u32 *		bitmask;
 	const u32 *		open_bitmap;
 	__u32			claim;
+	const struct nfs4_label *label;
 	struct nfs4_sequence_args	seq_args;
 };
 
@@ -361,6 +362,7 @@ 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;
@@ -405,6 +407,7 @@ struct nfs_closeargs {
 struct nfs_closeres {
 	nfs4_stateid            stateid;
 	struct nfs_fattr *	fattr;
+	struct nfs4_label	*label;
 	struct nfs_seqid *	seqid;
 	const struct nfs_server *server;
 	struct nfs4_sequence_res	seq_res;
@@ -478,6 +481,7 @@ struct nfs4_delegreturnargs {
 
 struct nfs4_delegreturnres {
 	struct nfs_fattr * fattr;
+	struct nfs4_label	*label;
 	const struct nfs_server *server;
 	struct nfs4_sequence_res	seq_res;
 };
@@ -498,6 +502,7 @@ struct nfs_readargs {
 
 struct nfs_readres {
 	struct nfs_fattr *	fattr;
+	struct nfs4_label	*label;
 	__u32			count;
 	int                     eof;
 	struct nfs4_sequence_res	seq_res;
@@ -566,6 +571,7 @@ struct nfs_removeargs {
 struct nfs_removeres {
 	const struct nfs_server *server;
 	struct nfs_fattr	*dir_attr;
+	struct nfs4_label	*dir_label;
 	struct nfs4_change_info	cinfo;
 	struct nfs4_sequence_res 	seq_res;
 };
@@ -578,6 +584,8 @@ 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 nfs4_sequence_args	seq_args;
 };
 
@@ -585,8 +593,10 @@ 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;
 	struct nfs4_sequence_res	seq_res;
 };
 
@@ -634,6 +644,7 @@ struct nfs_setattrargs {
 	struct iattr *                  iap;
 	const struct nfs_server *	server; /* Needed for name mapping */
 	const u32 *			bitmask;
+	const struct nfs4_label		*label;
 	struct nfs4_sequence_args 	seq_args;
 };
 
@@ -669,6 +680,7 @@ struct nfs_getaclres {
 
 struct nfs_setattrres {
 	struct nfs_fattr *              fattr;
+	struct nfs4_label		*label;
 	const struct nfs_server *	server;
 	struct nfs4_sequence_res	seq_res;
 };
@@ -715,6 +727,7 @@ struct nfs3_setaclargs {
 struct nfs_diropok {
 	struct nfs_fh *		fh;
 	struct nfs_fattr *	fattr;
+	struct nfs4_label	*label;
 };
 
 struct nfs_readlinkargs {
@@ -844,6 +857,7 @@ struct nfs4_accessargs {
 struct nfs4_accessres {
 	const struct nfs_server *	server;
 	struct nfs_fattr *		fattr;
+	struct nfs4_label		*label;
 	u32				supported;
 	u32				access;
 	struct nfs4_sequence_res	seq_res;
@@ -866,6 +880,7 @@ struct nfs4_create_arg {
 	const struct iattr *		attrs;
 	const struct nfs_fh *		dir_fh;
 	const u32 *			bitmask;
+	const struct nfs4_label		*label;
 	struct nfs4_sequence_args 	seq_args;
 };
 
@@ -873,6 +888,7 @@ 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;
 	struct nfs4_sequence_res	seq_res;
 };
@@ -898,6 +914,7 @@ struct nfs4_getattr_res {
 	const struct nfs_server *	server;
 	struct nfs_fattr *		fattr;
 	struct nfs4_sequence_res	seq_res;
+	struct nfs4_label		*label;
 };
 
 struct nfs4_link_arg {
@@ -911,8 +928,10 @@ struct nfs4_link_arg {
 struct nfs4_link_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;
 	struct nfs4_sequence_res	seq_res;
 };
 
@@ -928,6 +947,7 @@ struct nfs4_lookup_res {
 	const struct nfs_server *	server;
 	struct nfs_fattr *		fattr;
 	struct nfs_fh *			fh;
+	struct nfs4_label		*label;
 	struct nfs4_sequence_res	seq_res;
 };
 
-- 
1.7.11.7