linux-kernel - [PATCH] fuse_writepages_fill: simplified "if-else if" constuction

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Date:   Thu, 25 Jun 2020 12:30:18 +0300
From:   Vasily Averin <vvs@...tuozzo.com>
To:     Miklos Szeredi <miklos@...redi.hu>
Cc:     linux-fsdevel@...r.kernel.org, Maxim Patlasov <maximvp@...il.com>,
        Kirill Tkhai <ktkhai@...tuozzo.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] fuse_writepages_fill: simplified "if-else if" constuction

fuse_writepages_fill uses following construction:
if (wpa && ap->num_pages &&
    (A || B || C)) {
	action;
} else if (wpa && D) {
	if (E) {
		the same action;
	}
}

- ap->num_pages check is always true and can be removed
- "if" and "else if" calls the same action and can be merged.

Signed-off-by: Vasily Averin <vvs@...tuozzo.com>
---
 fs/fuse/file.c | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index cf267bd..c023f7f0 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -2035,17 +2035,14 @@ static int fuse_writepages_fill(struct page *page,
 	 */
 	is_writeback = fuse_page_is_writeback(inode, page->index);
 
-	if (wpa && ap->num_pages &&
+	if (wpa &&
 	    (is_writeback || ap->num_pages == fc->max_pages ||
 	     (ap->num_pages + 1) * PAGE_SIZE > fc->max_write ||
-	     data->orig_pages[ap->num_pages - 1]->index + 1 != page->index)) {
+	     (data->orig_pages[ap->num_pages - 1]->index + 1 != page->index) ||
+	     ((ap->num_pages == data->max_pages) &&
+				(!fuse_pages_realloc(data))))) {
 		fuse_writepages_send(data);
 		data->wpa = NULL;
-	} else if (wpa && ap->num_pages == data->max_pages) {
-		if (!fuse_pages_realloc(data)) {
-			fuse_writepages_send(data);
-			data->wpa = NULL;
-		}
 	}
 
 	err = -ENOMEM;
-- 
1.8.3.1