From: Miklos Szeredi <mszeredi@redhat.com>
Date: Fri, 22 Oct 2021 15:03:02 +0000 (+0200)
Subject: fuse: don't bump attr_version in cached write
X-Git-Tag: v6.6.17~8874^2~12
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=8c56e03d2e08d83776c89e4b6563ca8cfdf7da54;p=platform%2Fkernel%2Flinux-rpi.git

fuse: don't bump attr_version in cached write

The attribute version in fuse_inode should be updated whenever the
attributes might have changed on the server.  In case of cached writes this
is not the case, so updating the attr_version is unnecessary and could
possibly affect performance.

Open code the remaining part of fuse_write_update_size().

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
---

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 06967d8..c09ab83 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -2309,15 +2309,18 @@ static int fuse_write_end(struct file *file, struct address_space *mapping,
 	if (!copied)
 		goto unlock;
 
+	pos += copied;
 	if (!PageUptodate(page)) {
 		/* Zero any unwritten bytes at the end of the page */
-		size_t endoff = (pos + copied) & ~PAGE_MASK;
+		size_t endoff = pos & ~PAGE_MASK;
 		if (endoff)
 			zero_user_segment(page, endoff, PAGE_SIZE);
 		SetPageUptodate(page);
 	}
 
-	fuse_write_update_size(inode, pos + copied);
+	if (pos > inode->i_size)
+		i_size_write(inode, pos);
+
 	set_page_dirty(page);
 
 unlock: