[PATCH v2 01/18] mm/filemap: Rename generic_file_buffered_read subfunctions

["Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>]

The recent split of generic_file_buffered_read() created some very
long function names which are hard to distinguish from each other.
Rename as follows:

generic_file_buffered_read_readpage -> filemap_read_page
generic_file_buffered_read_pagenotuptodate -> filemap_update_page
generic_file_buffered_read_no_cached_page -> filemap_create_page
generic_file_buffered_read_get_pages -> filemap_get_pages

Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Reviewed-by: Kent Overstreet <kent.overstreet@xxxxxxxxx>
---
 mm/filemap.c | 44 +++++++++++++++-----------------------------
 1 file changed, 15 insertions(+), 29 deletions(-)

diff --git a/mm/filemap.c b/mm/filemap.c
index a68516ddeddc..23e3781b3aef 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2176,11 +2176,8 @@ static int lock_page_for_iocb(struct kiocb *iocb, struct page *page)
 		return lock_page_killable(page);
 }
 
-static struct page *
-generic_file_buffered_read_readpage(struct kiocb *iocb,
-				    struct file *filp,
-				    struct address_space *mapping,
-				    struct page *page)
+static struct page *filemap_read_page(struct kiocb *iocb, struct file *filp,
+		struct address_space *mapping, struct page *page)
 {
 	struct file_ra_state *ra = &filp->f_ra;
 	int error;
@@ -2231,12 +2228,9 @@ generic_file_buffered_read_readpage(struct kiocb *iocb,
 	return page;
 }
 
-static struct page *
-generic_file_buffered_read_pagenotuptodate(struct kiocb *iocb,
-					   struct file *filp,
-					   struct iov_iter *iter,
-					   struct page *page,
-					   loff_t pos, loff_t count)
+static struct page *filemap_update_page(struct kiocb *iocb, struct file *filp,
+		struct iov_iter *iter, struct page *page, loff_t pos,
+		loff_t count)
 {
 	struct address_space *mapping = filp->f_mapping;
 	struct inode *inode = mapping->host;
@@ -2299,12 +2293,11 @@ generic_file_buffered_read_pagenotuptodate(struct kiocb *iocb,
 		return page;
 	}
 
-	return generic_file_buffered_read_readpage(iocb, filp, mapping, page);
+	return filemap_read_page(iocb, filp, mapping, page);
 }
 
-static struct page *
-generic_file_buffered_read_no_cached_page(struct kiocb *iocb,
-					  struct iov_iter *iter)
+static struct page *filemap_create_page(struct kiocb *iocb,
+		struct iov_iter *iter)
 {
 	struct file *filp = iocb->ki_filp;
 	struct address_space *mapping = filp->f_mapping;
@@ -2315,10 +2308,6 @@ generic_file_buffered_read_no_cached_page(struct kiocb *iocb,
 	if (iocb->ki_flags & IOCB_NOIO)
 		return ERR_PTR(-EAGAIN);
 
-	/*
-	 * Ok, it wasn't cached, so we need to create a new
-	 * page..
-	 */
 	page = page_cache_alloc(mapping);
 	if (!page)
 		return ERR_PTR(-ENOMEM);
@@ -2330,13 +2319,11 @@ generic_file_buffered_read_no_cached_page(struct kiocb *iocb,
 		return error != -EEXIST ? ERR_PTR(error) : NULL;
 	}
 
-	return generic_file_buffered_read_readpage(iocb, filp, mapping, page);
+	return filemap_read_page(iocb, filp, mapping, page);
 }
 
-static int generic_file_buffered_read_get_pages(struct kiocb *iocb,
-						struct iov_iter *iter,
-						struct page **pages,
-						unsigned int nr)
+static int filemap_get_pages(struct kiocb *iocb, struct iov_iter *iter,
+		struct page **pages, unsigned int nr)
 {
 	struct file *filp = iocb->ki_filp;
 	struct address_space *mapping = filp->f_mapping;
@@ -2363,7 +2350,7 @@ static int generic_file_buffered_read_get_pages(struct kiocb *iocb,
 	if (nr_got)
 		goto got_pages;
 
-	pages[0] = generic_file_buffered_read_no_cached_page(iocb, iter);
+	pages[0] = filemap_create_page(iocb, iter);
 	err = PTR_ERR_OR_ZERO(pages[0]);
 	if (!IS_ERR_OR_NULL(pages[0]))
 		nr_got = 1;
@@ -2397,8 +2384,8 @@ static int generic_file_buffered_read_get_pages(struct kiocb *iocb,
 				break;
 			}
 
-			page = generic_file_buffered_read_pagenotuptodate(iocb,
-					filp, iter, page, pg_pos, pg_count);
+			page = filemap_update_page(iocb, filp, iter, page,
+					pg_pos, pg_count);
 			if (IS_ERR_OR_NULL(page)) {
 				for (j = i + 1; j < nr_got; j++)
 					put_page(pages[j]);
@@ -2474,8 +2461,7 @@ ssize_t generic_file_buffered_read(struct kiocb *iocb,
 			iocb->ki_flags |= IOCB_NOWAIT;
 
 		i = 0;
-		pg_nr = generic_file_buffered_read_get_pages(iocb, iter,
-							     pages, nr_pages);
+		pg_nr = filemap_get_pages(iocb, iter, pages, nr_pages);
 		if (pg_nr < 0) {
 			error = pg_nr;
 			break;
-- 
2.28.0