linux-kernel - [PATCH 2/8] fuse: Export IO helpers

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Message-Id: <20210124232007.21639-3-richard@nod.at>
Date:   Mon, 25 Jan 2021 00:20:01 +0100
From:   Richard Weinberger <richard@....at>
To:     miklos@...redi.hu
Cc:     miquel.raynal@...tlin.com, vigneshr@...com,
        boris.brezillon@...labora.com, rminnich@...gle.com,
        sven@...fation.org, linux-kernel@...r.kernel.org,
        linux-mtd@...ts.infradead.org, fuse-devel@...ts.sourceforge.net,
        Richard Weinberger <richard@....at>
Subject: [PATCH 2/8] fuse: Export IO helpers

MUSE will use this functions in its IO path,
so export them.

Signed-off-by: Richard Weinberger <richard@....at>
---
 fs/fuse/file.c   | 16 +++-------------
 fs/fuse/fuse_i.h | 16 ++++++++++++++++
 2 files changed, 19 insertions(+), 13 deletions(-)

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 8cccecb55fb8..d41660b7f5bc 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -20,8 +20,8 @@
 #include <linux/uio.h>
 #include <linux/fs.h>
 
-static struct page **fuse_pages_alloc(unsigned int npages, gfp_t flags,
-				      struct fuse_page_desc **desc)
+struct page **fuse_pages_alloc(unsigned int npages, gfp_t flags,
+			       struct fuse_page_desc **desc)
 {
 	struct page **pages;
 
@@ -31,6 +31,7 @@ static struct page **fuse_pages_alloc(unsigned int npages, gfp_t flags,
 
 	return pages;
 }
+EXPORT_SYMBOL_GPL(fuse_pages_alloc);
 
 static int fuse_send_open(struct fuse_mount *fm, u64 nodeid, struct file *file,
 			  int opcode, struct fuse_open_out *outargp)
@@ -1356,17 +1357,6 @@ static inline void fuse_page_descs_length_init(struct fuse_page_desc *descs,
 		descs[i].length = PAGE_SIZE - descs[i].offset;
 }
 
-static inline unsigned long fuse_get_user_addr(const struct iov_iter *ii)
-{
-	return (unsigned long)ii->iov->iov_base + ii->iov_offset;
-}
-
-static inline size_t fuse_get_frag_size(const struct iov_iter *ii,
-					size_t max_size)
-{
-	return min(iov_iter_single_seg_count(ii), max_size);
-}
-
 static int fuse_get_user_pages(struct fuse_args_pages *ap, struct iov_iter *ii,
 			       size_t *nbytesp, int write,
 			       unsigned int max_pages)
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index 7c4b8cb93f9f..8c56a3fd2c4e 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -31,6 +31,7 @@
 #include <linux/pid_namespace.h>
 #include <linux/refcount.h>
 #include <linux/user_namespace.h>
+#include <linux/uio.h>
 
 /** Default max number of pages that can be used in a single read request */
 #define FUSE_DEFAULT_MAX_PAGES_PER_REQ 32
@@ -871,6 +872,17 @@ static inline bool fuse_is_bad(struct inode *inode)
 	return unlikely(test_bit(FUSE_I_BAD, &get_fuse_inode(inode)->state));
 }
 
+static inline unsigned long fuse_get_user_addr(const struct iov_iter *ii)
+{
+	return (unsigned long)ii->iov->iov_base + ii->iov_offset;
+}
+
+static inline size_t fuse_get_frag_size(const struct iov_iter *ii,
+					size_t max_size)
+{
+	return min(iov_iter_single_seg_count(ii), max_size);
+}
+
 /** Device operations */
 extern const struct file_operations fuse_dev_operations;
 
@@ -1213,4 +1225,8 @@ void fuse_dax_inode_cleanup(struct inode *inode);
 bool fuse_dax_check_alignment(struct fuse_conn *fc, unsigned int map_alignment);
 void fuse_dax_cancel_work(struct fuse_conn *fc);
 
+/* file.c */
+struct page **fuse_pages_alloc(unsigned int npages, gfp_t flags,
+			       struct fuse_page_desc **desc);
+
 #endif /* _FS_FUSE_I_H */
-- 
2.26.2