page-read: Fix naming

The open_page_at one is quite obfuscating.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

include/page-read.h

@@ -67,7 +67,7 @@ struct page_read {
 };
 
 extern int open_page_read(int pid, struct page_read *);
-extern int open_page_at(int dfd, int pid, struct page_read *pr, int flags);
+extern int open_page_read_at(int dfd, int pid, struct page_read *pr, int flags);
 extern int open_page_rw(int pid, struct page_read *);
 extern void pagemap2iovec(PagemapEntry *pe, struct iovec *iov);
 extern int seek_pagemap_page(struct page_read *pr, unsigned long vaddr, bool warn);

page-read.c

@@ -181,7 +181,7 @@ static int try_open_parent(int dfd, int pid, struct page_read *pr, int flags)
 	if (!parent)
 		goto err_cl;
 
-	if (open_page_at(pfd, pid, parent, flags)) {
+	if (open_page_read_at(pfd, pid, parent, flags)) {
 		if (errno != ENOENT)
 			goto err_free;
 		xfree(parent);
@@ -200,7 +200,7 @@ err_cl:
 	return -1;
 }
 
-int open_page_at(int dfd, int pid, struct page_read *pr, int flags)
+int open_page_read_at(int dfd, int pid, struct page_read *pr, int flags)
 {
 	pr->pe = NULL;
 
@@ -242,17 +242,12 @@ int open_page_at(int dfd, int pid, struct page_read *pr, int flags)
 	return 0;
 }
 
-static int open_page_read_at(int dfd, int pid, struct page_read *pr)
-{
-	return open_page_at(dfd, pid, pr, O_RSTR);
-}
-
 int open_page_read(int pid, struct page_read *pr)
 {
-	return open_page_read_at(get_service_fd(IMG_FD_OFF), pid, pr);
+	return open_page_read_at(get_service_fd(IMG_FD_OFF), pid, pr, O_RSTR);
 }
 
 int open_page_rw(int pid, struct page_read *pr)
 {
-	return open_page_at(get_service_fd(IMG_FD_OFF), pid, pr, O_RDWR);
+	return open_page_read_at(get_service_fd(IMG_FD_OFF), pid, pr, O_RDWR);
 }

page-xfer.c

@@ -568,7 +568,7 @@ static int open_page_local_xfer(struct page_xfer *xfer, int fd_type, long id)
 			return -1;
 		}
 
-		ret = open_page_at(pfd, id, xfer->parent, O_RDWR);
+		ret = open_page_read_at(pfd, id, xfer->parent, O_RDWR);
 		if (ret) {
 			pr_perror("Can't dedup old image format");
 			xfree(xfer->parent);