linux-kernel - [PATCH 1/2] fuse: use list_first_entry_or

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Date:	Wed,  8 Jun 2016 18:48:01 +0800
From:	Geliang Tang <geliangtang@...il.com>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	Geliang Tang <geliangtang@...il.com>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] fuse: use list_first_entry_or_null

Use list_first_entry_or_null() instead of list_empty() and list_entry()
to simplify the code.

Signed-off-by: Geliang Tang <geliangtang@...il.com>
---
 fs/fuse/dev.c  | 7 +++----
 fs/fuse/file.c | 9 ++++-----
 2 files changed, 7 insertions(+), 9 deletions(-)

diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index cbece12..1432cf7 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -1259,11 +1259,10 @@ static ssize_t fuse_dev_do_read(struct fuse_dev *fud, struct file *file,
 	if (!fiq->connected)
 		goto err_unlock;
 
-	if (!list_empty(&fiq->interrupts)) {
-		req = list_entry(fiq->interrupts.next, struct fuse_req,
-				 intr_entry);
+	req = list_first_entry_or_null(&fiq->interrupts, struct fuse_req,
+				       intr_entry);
+	if (req)
 		return fuse_read_interrupt(fiq, cs, nbytes, req);
-	}
 
 	if (forget_pending(fiq)) {
 		if (list_empty(&fiq->pending) || fiq->forget_batch-- > 0)
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 9154f86..c1d97a1 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -1565,14 +1565,13 @@ static void fuse_writepage_end(struct fuse_conn *fc, struct fuse_req *req)
 static struct fuse_file *__fuse_write_file_get(struct fuse_conn *fc,
 					       struct fuse_inode *fi)
 {
-	struct fuse_file *ff = NULL;
+	struct fuse_file *ff;
 
 	spin_lock(&fc->lock);
-	if (!list_empty(&fi->write_files)) {
-		ff = list_entry(fi->write_files.next, struct fuse_file,
-				write_entry);
+	ff = list_first_entry_or_null(&fi->write_files, struct fuse_file,
+				      write_entry);
+	if (ff)
 		fuse_file_get(ff);
-	}
 	spin_unlock(&fc->lock);
 
 	return ff;
-- 
1.9.1