linux-kernel - [PATCH 07/12] eventfd: use __anon_inode

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Date:   Fri,  8 May 2020 17:36:29 +0200
From:   Christoph Hellwig <hch@....de>
To:     Alexander Viro <viro@...iv.linux.org.uk>
Cc:     linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-gpio@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-rdma@...r.kernel.org, kvm@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, io-uring@...r.kernel.org,
        netdev@...r.kernel.org, bpf@...r.kernel.org
Subject: [PATCH 07/12] eventfd: use __anon_inode_getfd

Use __anon_inode_getfd instead of opencoding the logic using
get_unused_fd_flags + anon_inode_getfile.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 fs/eventfd.c | 13 ++-----------
 1 file changed, 2 insertions(+), 11 deletions(-)

diff --git a/fs/eventfd.c b/fs/eventfd.c
index df466ef81dddf..9b6d5137679b2 100644
--- a/fs/eventfd.c
+++ b/fs/eventfd.c
@@ -423,20 +423,11 @@ static int do_eventfd(unsigned int count, int flags)
 	ctx->count = count;
 	ctx->flags = flags;
 	ctx->id = ida_simple_get(&eventfd_ida, 0, 0, GFP_KERNEL);
-
-	flags &= EFD_SHARED_FCNTL_FLAGS;
-	flags |= O_RDWR;
-	fd = get_unused_fd_flags(flags);
+	fd = __anon_inode_getfd("[eventfd]", &eventfd_fops, ctx,
+		(flags & EFD_SHARED_FCNTL_FLAGS) | O_RDWR, &file);
 	if (fd < 0)
 		goto err;
 
-	file = anon_inode_getfile("[eventfd]", &eventfd_fops, ctx, flags);
-	if (IS_ERR(file)) {
-		put_unused_fd(fd);
-		fd = PTR_ERR(file);
-		goto err;
-	}
-
 	file->f_mode |= FMODE_NOWAIT;
 	fd_install(fd, file);
 	return fd;
-- 
2.26.2