[PATCH 4/6] fs: move filp_close() outside of __close_fd_get_file()

Jens Axboe
2020-01-07T17:06:21Z

Just one caller of this, and just use filp_close() there manually.
This is important to allow async close/removal of the fd.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
drivers/android/binder.c | 6 ++++--
fs/file.c | 6 ++++--
2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index b2dad43dbf82..cf72ca250a08 100644
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -2249,10 +2249,12 @@ static void binder_deferred_fd_close(int fd)
return;
init_task_work(&twcb->twork, binder_do_fd_close);
__close_fd_get_file(fd, &twcb->file);
- if (twcb->file)
+ if (twcb->file) {
+ filp_close(twcb->file, current->files);
task_work_add(current, &twcb->twork, true);
- else
+ } else {
kfree(twcb);
+ }
}

static void binder_transaction_buffer_release(struct binder_proc *proc,
diff --git a/fs/file.c b/fs/file.c
index 3da91a112bab..fb7081bfac2b 100644
--- a/fs/file.c
+++ b/fs/file.c
@@ -642,7 +642,9 @@ int __close_fd(struct files_struct *files, unsigned fd)
EXPORT_SYMBOL(__close_fd); /* for ksys_close() */

/*
- * variant of __close_fd that gets a ref on the file for later fput
+ * variant of __close_fd that gets a ref on the file for later fput.
+ * The caller must ensure that filp_close() called on the file, and then
+ * an fput().
*/
int __close_fd_get_file(unsigned int fd, struct file **res)
{
@@ -662,7 +664,7 @@ int __close_fd_get_file(unsigned int fd, struct file **res)
spin_unlock(&files->file_lock);
get_file(file);
*res = file;
- return filp_close(file, files);
+ return 0;

out_unlock:
spin_unlock(&files->file_lock);
--
2.24.1