[PATCH] nilfs2: make splice write available again

[Ryusuke Konishi <konishi.ryusuke-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

From: Joachim Henke <joachim.henke-kyawv7ubMNaakBO8gow8eQ@public.gmane.org>

Since 5.10, splice() or sendfile() to NILFS2 return EINVAL. This was
caused by commit 36e2c7421f02 ("fs: don't allow splice read/write
without explicit ops").

This patch initializes the splice_write field in file_operations, like
most file systems do, to restore the functionality.

Signed-off-by: Joachim Henke <joachim.henke-kyawv7ubMNaakBO8gow8eQ@public.gmane.org>
Signed-off-by: Ryusuke Konishi <konishi.ryusuke-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Tested-by: Ryusuke Konishi <konishi.ryusuke-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: stable-u79uwXL29TY76Z2rM5mHXA@public.gmane.org # 5.10+
---
 fs/nilfs2/file.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/nilfs2/file.c b/fs/nilfs2/file.c
index 64bc81363c6c..e1bd592ce700 100644
--- a/fs/nilfs2/file.c
+++ b/fs/nilfs2/file.c
@@ -141,6 +141,7 @@ static int nilfs_file_mmap(struct file *file, struct vm_area_struct *vma)
 	/* .release	= nilfs_release_file, */
 	.fsync		= nilfs_sync_file,
 	.splice_read	= generic_file_splice_read,
+	.splice_write   = iter_file_splice_write,
 };
 
 const struct inode_operations nilfs_file_inode_operations = {
-- 
1.8.3.1