diff --git a/fs/9p/fid.c b/fs/9p/fid.c
index 60fb47469c86..ed4f8519b627 100644
--- a/fs/9p/fid.c
+++ b/fs/9p/fid.c
@@ -91,10 +91,10 @@ static struct p9_fid *v9fs_fid_find(struct dentry *dentry, kuid_t uid, int any)
  * dentry names.
  */
 static int build_path_from_dentry(struct v9fs_session_info *v9ses,
-				  struct dentry *dentry, char ***names)
+				  struct dentry *dentry, const unsigned char ***names)
 {
 	int n = 0, i;
-	char **wnames;
+	const unsigned char **wnames;
 	struct dentry *ds;
 
 	for (ds = dentry; !IS_ROOT(ds); ds = ds->d_parent)
@@ -105,7 +105,7 @@ static int build_path_from_dentry(struct v9fs_session_info *v9ses,
 		goto err_out;
 
 	for (ds = dentry, i = (n-1); i >= 0; i--, ds = ds->d_parent)
-		wnames[i] = (char  *)ds->d_name.name;
+		wnames[i] = ds->d_name.name;
 
 	*names = wnames;
 	return n;
@@ -117,7 +117,7 @@ static struct p9_fid *v9fs_fid_lookup_with_uid(struct dentry *dentry,
 					       kuid_t uid, int any)
 {
 	struct dentry *ds;
-	char **wnames, *uname;
+	const unsigned char **wnames, *uname;
 	int i, n, l, clone, access;
 	struct v9fs_session_info *v9ses;
 	struct p9_fid *fid, *old_fid = NULL;
@@ -137,7 +137,7 @@ static struct p9_fid *v9fs_fid_lookup_with_uid(struct dentry *dentry,
 	fid = v9fs_fid_find(ds, uid, any);
 	if (fid) {
 		/* Found the parent fid do a lookup with that */
-		fid = p9_client_walk(fid, 1, (char **)&dentry->d_name.name, 1);
+		fid = p9_client_walk(fid, 1, &dentry->d_name.name, 1);
 		goto fid_out;
 	}
 	up_read(&v9ses->rename_sem);
diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index f1d96233670c..2a5de610dd8f 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -643,7 +643,7 @@ v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
 		struct dentry *dentry, char *extension, u32 perm, u8 mode)
 {
 	int err;
-	char *name;
+	const unsigned char *name;
 	struct p9_fid *dfid, *ofid, *fid;
 	struct inode *inode;
 
@@ -652,7 +652,7 @@ v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
 	err = 0;
 	ofid = NULL;
 	fid = NULL;
-	name = (char *) dentry->d_name.name;
+	name = dentry->d_name.name;
 	dfid = v9fs_parent_fid(dentry);
 	if (IS_ERR(dfid)) {
 		err = PTR_ERR(dfid);
@@ -788,7 +788,7 @@ struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
 	struct v9fs_session_info *v9ses;
 	struct p9_fid *dfid, *fid;
 	struct inode *inode;
-	char *name;
+	const unsigned char *name;
 
 	p9_debug(P9_DEBUG_VFS, "dir: %p dentry: (%pd) %p flags: %x\n",
 		 dir, dentry, dentry, flags);
@@ -802,7 +802,7 @@ struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
 	if (IS_ERR(dfid))
 		return ERR_CAST(dfid);
 
-	name = (char *) dentry->d_name.name;
+	name = dentry->d_name.name;
 	fid = p9_client_walk(dfid, 1, &name, 1);
 	if (IS_ERR(fid)) {
 		if (fid == ERR_PTR(-ENOENT)) {
@@ -1012,7 +1012,7 @@ v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 	}
 	v9fs_blank_wstat(&wstat);
 	wstat.muid = v9ses->uname;
-	wstat.name = (char *) new_dentry->d_name.name;
+	wstat.name = new_dentry->d_name.name;
 	retval = p9_client_wstat(oldfid, &wstat);
 
 clunk_newdir:
diff --git a/fs/9p/vfs_inode_dotl.c b/fs/9p/vfs_inode_dotl.c
index 570e63ee5b71..70f9887c59a9 100644
--- a/fs/9p/vfs_inode_dotl.c
+++ b/fs/9p/vfs_inode_dotl.c
@@ -244,7 +244,7 @@ v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
 	int err = 0;
 	kgid_t gid;
 	umode_t mode;
-	char *name = NULL;
+	const unsigned char *name = NULL;
 	struct p9_qid qid;
 	struct inode *inode;
 	struct p9_fid *fid = NULL;
@@ -269,7 +269,7 @@ v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
 
 	v9ses = v9fs_inode2v9ses(dir);
 
-	name = (char *) dentry->d_name.name;
+	name = dentry->d_name.name;
 	p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%hx\n",
 		 name, flags, omode);
 
@@ -385,7 +385,7 @@ static int v9fs_vfs_mkdir_dotl(struct inode *dir,
 	struct v9fs_session_info *v9ses;
 	struct p9_fid *fid = NULL, *dfid = NULL;
 	kgid_t gid;
-	char *name;
+	const unsigned char *name;
 	umode_t mode;
 	struct inode *inode;
 	struct p9_qid qid;
@@ -416,7 +416,7 @@ static int v9fs_vfs_mkdir_dotl(struct inode *dir,
 			 err);
 		goto error;
 	}
-	name = (char *) dentry->d_name.name;
+	name = dentry->d_name.name;
 	err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
 	if (err < 0)
 		goto error;
@@ -679,14 +679,14 @@ v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
 {
 	int err;
 	kgid_t gid;
-	char *name;
+	const unsigned char *name;
 	struct p9_qid qid;
 	struct inode *inode;
 	struct p9_fid *dfid;
 	struct p9_fid *fid = NULL;
 	struct v9fs_session_info *v9ses;
 
-	name = (char *) dentry->d_name.name;
+	name = dentry->d_name.name;
 	p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname);
 	v9ses = v9fs_inode2v9ses(dir);
 
@@ -700,7 +700,7 @@ v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
 	gid = v9fs_get_fsgid_for_create(dir);
 
 	/* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
-	err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid);
+	err = p9_client_symlink(dfid, name, symname, gid, &qid);
 
 	if (err < 0) {
 		p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
@@ -776,7 +776,7 @@ v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
 	if (IS_ERR(oldfid))
 		return PTR_ERR(oldfid);
 
-	err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name);
+	err = p9_client_link(dfid, oldfid, dentry->d_name.name);
 
 	if (err < 0) {
 		p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
@@ -813,7 +813,7 @@ v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
 {
 	int err;
 	kgid_t gid;
-	char *name;
+	const unsigned char *name;
 	umode_t mode;
 	struct v9fs_session_info *v9ses;
 	struct p9_fid *fid = NULL, *dfid = NULL;
@@ -843,7 +843,7 @@ v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
 			 err);
 		goto error;
 	}
-	name = (char *) dentry->d_name.name;
+	name = dentry->d_name.name;
 
 	err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
 	if (err < 0)
diff --git a/fs/hfs/dir.c b/fs/hfs/dir.c
index 5de5c48b418d..75b254280ff6 100644
--- a/fs/hfs/dir.c
+++ b/fs/hfs/dir.c
@@ -169,7 +169,7 @@ static int hfs_readdir(struct file *file, struct dir_context *ctx)
 	 * Can be done after the list insertion; exclusion with
 	 * hfs_delete_cat() is provided by directory lock.
 	 */
-	memcpy(&rd->key, &fd.key, sizeof(struct hfs_cat_key));
+	memcpy(&rd->key, &fd.key->cat, sizeof(struct hfs_cat_key));
 out:
 	hfs_find_exit(&fd);
 	return err;
diff --git a/include/net/9p/9p.h b/include/net/9p/9p.h
index 27dfe85772b1..b8eb51a661e5 100644
--- a/include/net/9p/9p.h
+++ b/include/net/9p/9p.h
@@ -402,10 +402,10 @@ struct p9_wstat {
 	u32 atime;
 	u32 mtime;
 	u64 length;
-	char *name;
-	char *uid;
-	char *gid;
-	char *muid;
+	const char *name;
+	const char *uid;
+	const char *gid;
+	const char *muid;
 	char *extension;	/* 9p2000.u extensions */
 	kuid_t n_uid;		/* 9p2000.u extensions */
 	kgid_t n_gid;		/* 9p2000.u extensions */
diff --git a/include/net/9p/client.h b/include/net/9p/client.h
index c6b97e58cf84..b582339ccef5 100644
--- a/include/net/9p/client.h
+++ b/include/net/9p/client.h
@@ -223,16 +223,16 @@ void p9_client_destroy(struct p9_client *clnt);
 void p9_client_disconnect(struct p9_client *clnt);
 void p9_client_begin_disconnect(struct p9_client *clnt);
 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
-				char *uname, kuid_t n_uname, char *aname);
+				const char *uname, kuid_t n_uname, const char *aname);
 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
-		char **wnames, int clone);
+		const unsigned char * const *wnames, int clone);
 int p9_client_open(struct p9_fid *fid, int mode);
-int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
+int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode,
 							char *extension);
-int p9_client_link(struct p9_fid *fid, struct p9_fid *oldfid, char *newname);
-int p9_client_symlink(struct p9_fid *fid, char *name, char *symname, kgid_t gid,
-							struct p9_qid *qid);
-int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode,
+int p9_client_link(struct p9_fid *fid, struct p9_fid *oldfid, const char *newname);
+int p9_client_symlink(struct p9_fid *fid, const char *name, const char *symname,
+		kgid_t gid, struct p9_qid *qid);
+int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, u32 mode,
 		kgid_t gid, struct p9_qid *qid);
 int p9_client_clunk(struct p9_fid *fid);
 int p9_client_fsync(struct p9_fid *fid, int datasync);
@@ -250,9 +250,9 @@ int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *attr);
 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
 							u64 request_mask);
 
-int p9_client_mknod_dotl(struct p9_fid *oldfid, char *name, int mode,
+int p9_client_mknod_dotl(struct p9_fid *oldfid, const char *name, int mode,
 			dev_t rdev, kgid_t gid, struct p9_qid *);
-int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode,
+int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode,
 				kgid_t gid, struct p9_qid *);
 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status);
 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *fl);
diff --git a/net/9p/client.c b/net/9p/client.c
index 25cfd8a4bc36..3ce672af1596 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -1101,7 +1101,7 @@ void p9_client_begin_disconnect(struct p9_client *clnt)
 EXPORT_SYMBOL(p9_client_begin_disconnect);
 
 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
-	char *uname, kuid_t n_uname, char *aname)
+	const char *uname, kuid_t n_uname, const char *aname)
 {
 	int err = 0;
 	struct p9_req_t *req;
@@ -1149,7 +1149,7 @@ error:
 EXPORT_SYMBOL(p9_client_attach);
 
 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
-		char **wnames, int clone)
+		const unsigned char * const *wnames, int clone)
 {
 	int err;
 	struct p9_client *clnt;
@@ -1271,7 +1271,7 @@ error:
 }
 EXPORT_SYMBOL(p9_client_open);
 
-int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode,
+int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, u32 mode,
 		kgid_t gid, struct p9_qid *qid)
 {
 	int err = 0;
@@ -1316,7 +1316,7 @@ error:
 }
 EXPORT_SYMBOL(p9_client_create_dotl);
 
-int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
+int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode,
 		     char *extension)
 {
 	int err;
@@ -1361,8 +1361,8 @@ error:
 }
 EXPORT_SYMBOL(p9_client_fcreate);
 
-int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, kgid_t gid,
-		struct p9_qid *qid)
+int p9_client_symlink(struct p9_fid *dfid, const char *name,
+		const char *symtgt, kgid_t gid, struct p9_qid *qid)
 {
 	int err = 0;
 	struct p9_client *clnt;
@@ -1395,7 +1395,7 @@ error:
 }
 EXPORT_SYMBOL(p9_client_symlink);
 
-int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname)
+int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname)
 {
 	struct p9_client *clnt;
 	struct p9_req_t *req;
@@ -2117,7 +2117,7 @@ error:
 }
 EXPORT_SYMBOL(p9_client_readdir);
 
-int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode,
+int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode,
 			dev_t rdev, kgid_t gid, struct p9_qid *qid)
 {
 	int err;
@@ -2148,7 +2148,7 @@ error:
 }
 EXPORT_SYMBOL(p9_client_mknod_dotl);
 
-int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode,
+int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode,
 				kgid_t gid, struct p9_qid *qid)
 {
 	int err;
diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
index e8b79a7b50bd..d8593f1251ec 100644
--- a/tools/testing/selftests/Makefile
+++ b/tools/testing/selftests/Makefile
@@ -26,6 +26,7 @@ TARGETS += ptrace
 TARGETS += seccomp
 TARGETS += sigaltstack
 TARGETS += size
+TARGETS += splice
 TARGETS += static_keys
 TARGETS += sync
 TARGETS += sysctl
diff --git a/tools/testing/selftests/splice/Makefile b/tools/testing/selftests/splice/Makefile
new file mode 100644
index 000000000000..de51f439d4a6
--- /dev/null
+++ b/tools/testing/selftests/splice/Makefile
@@ -0,0 +1,8 @@
+TEST_PROGS := default_file_splice_read.sh
+EXTRA := default_file_splice_read
+all: $(TEST_PROGS) $(EXTRA)
+
+include ../lib.mk
+
+clean:
+	rm -fr $(TEST_PROGS) $(EXTRA)
diff --git a/tools/testing/selftests/splice/default_file_splice_read.c b/tools/testing/selftests/splice/default_file_splice_read.c
new file mode 100644
index 000000000000..01dd6091554c
--- /dev/null
+++ b/tools/testing/selftests/splice/default_file_splice_read.c
@@ -0,0 +1,8 @@
+#define _GNU_SOURCE
+#include <fcntl.h>
+
+int main(int argc, char **argv)
+{
+        splice(0, 0, 1, 0, 1<<30, 0);
+	return 0;
+}
diff --git a/tools/testing/selftests/splice/default_file_splice_read.sh b/tools/testing/selftests/splice/default_file_splice_read.sh
new file mode 100755
index 000000000000..1ea2adeabc94
--- /dev/null
+++ b/tools/testing/selftests/splice/default_file_splice_read.sh
@@ -0,0 +1,7 @@
+#!/bin/sh
+n=`./default_file_splice_read </dev/null | wc -c`
+
+test "$n" = 0 && exit 0
+
+echo "default_file_splice_read broken: leaked $n"
+exit 1