[dpdk-dev] [PATCH v4 4/5] vhost: eventfd_link: replace copy-pasted sys_close

[Pavel Boldin]

Replace copy-pasted `fget_from_files' -> `filp_close' with
a `sys_close' call.
---
 lib/librte_vhost/eventfd_link/eventfd_link.c | 49 +++++++---------------------
 1 file changed, 12 insertions(+), 37 deletions(-)

diff --git a/lib/librte_vhost/eventfd_link/eventfd_link.c b/lib/librte_vhost/eventfd_link/eventfd_link.c
index 0a06594..9bc52a3 100644
--- a/lib/librte_vhost/eventfd_link/eventfd_link.c
+++ b/lib/librte_vhost/eventfd_link/eventfd_link.c
@@ -88,9 +88,8 @@ eventfd_link_ioctl_copy(unsigned long arg)
 {
 	void __user *argp = (void __user *) arg;
 	struct task_struct *task_target = NULL;
-	struct file *file;
-	struct files_struct *files;
-	struct fdtable *fdt;
+	struct file *target_file;
+	struct files_struct *target_files;
 	struct eventfd_copy eventfd_copy;
 	long ret = -EFAULT;
 
@@ -109,51 +108,27 @@ eventfd_link_ioctl_copy(unsigned long arg)
 		goto out;
 	}
 
-	ret = -ESTALE;
-	files = get_files_struct(current);
-	if (files == NULL) {
-		pr_info("Failed to get current files struct\n");
-		goto out_task;
-	}
-
-	ret = -EBADF;
-	file = fget_from_files(files, eventfd_copy.source_fd);
-
-	if (file == NULL) {
-		pr_info("Failed to get fd %d from source\n",
-			eventfd_copy.source_fd);
-		put_files_struct(files);
+	/* Closing the source_fd */
+	ret = sys_close(eventfd_copy.source_fd);
+	if (ret)
 		goto out_task;
-	}
-
-	/*
-	 * Release the existing eventfd in the source process
-	 */
-	spin_lock(&files->file_lock);
-	fput(file);
-	filp_close(file, files);
-	fdt = files_fdtable(files);
-	fdt->fd[eventfd_copy.source_fd] = NULL;
-	spin_unlock(&files->file_lock);
-
-	put_files_struct(files);
+	ret = -ESTALE;
 
 	/*
 	 * Find the file struct associated with the target fd.
 	 */
 
-	ret = -ESTALE;
-	files = get_files_struct(task_target);
-	if (files == NULL) {
+	target_files = get_files_struct(task_target);
+	if (target_files == NULL) {
 		pr_info("Failed to get target files struct\n");
 		goto out_task;
 	}
 
 	ret = -EBADF;
-	file = fget_from_files(files, eventfd_copy.target_fd);
-	put_files_struct(files);
+	target_file = fget_from_files(target_files, eventfd_copy.target_fd);
+	put_files_struct(target_files);
 
-	if (file == NULL) {
+	if (target_file == NULL) {
 		pr_info("Failed to get fd %d from target\n",
 			eventfd_copy.target_fd);
 		goto out_task;
@@ -164,7 +139,7 @@ eventfd_link_ioctl_copy(unsigned long arg)
 	 * file desciptor of the source process,
 	 */
 
-	fd_install(eventfd_copy.source_fd, file);
+	fd_install(eventfd_copy.source_fd, target_file);
 	ret = 0;
 
 out_task:
-- 
1.9.1