[RFC PATCH v3 2/8] fuse: export extend_arg() and factor out fuse_ext_size()

[Luis Henriques <luis@igalia.com>]

Export (and rename) extend_arg() and fuse_ext_size() as these functions
are useful for using extension headers in other places.

Signed-off-by: Luis Henriques <luis@igalia.com>
---
 fs/fuse/dir.c    | 9 ++-------
 fs/fuse/fuse_i.h | 7 +++++++
 2 files changed, 9 insertions(+), 7 deletions(-)

diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index e3000affff88..f5eacea44896 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -713,7 +713,7 @@ static int get_security_context(struct dentry *entry, umode_t mode,
 	return err;
 }
 
-static void *extend_arg(struct fuse_in_arg *buf, u32 bytes)
+void *fuse_extend_arg(struct fuse_in_arg *buf, u32 bytes)
 {
 	void *p;
 	u32 newlen = buf->size + bytes;
@@ -733,11 +733,6 @@ static void *extend_arg(struct fuse_in_arg *buf, u32 bytes)
 	return p + newlen - bytes;
 }
 
-static u32 fuse_ext_size(size_t size)
-{
-	return FUSE_REC_ALIGN(sizeof(struct fuse_ext_header) + size);
-}
-
 /*
  * This adds just a single supplementary group that matches the parent's group.
  */
@@ -758,7 +753,7 @@ static int get_create_supp_group(struct mnt_idmap *idmap,
 	    !vfsgid_in_group_p(vfsgid))
 		return 0;
 
-	xh = extend_arg(ext, sg_len);
+	xh = fuse_extend_arg(ext, sg_len);
 	if (!xh)
 		return -ENOMEM;
 
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index 6178a012f36c..135027efec7a 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -1410,6 +1410,13 @@ int fuse_valid_type(int m);
 
 bool fuse_invalid_attr(struct fuse_attr *attr);
 
+void *fuse_extend_arg(struct fuse_in_arg *buf, u32 bytes);
+
+static inline u32 fuse_ext_size(size_t size)
+{
+	return FUSE_REC_ALIGN(sizeof(struct fuse_ext_header) + size);
+}
+
 /**
  * Is current process allowed to perform filesystem operation?
  */