kernfs: wire up ->splice_read and ->splice_write

Wire up the splice_read and splice_write methods to the default
helpers using ->read_iter and ->write_iter now that those are
implemented for kernfs.  This restores support to use splice and
sendfile on kernfs files.

Fixes: 36e2c7421f02 ("fs: don't allow splice read/write without explicit ops")
Reported-by: Siddharth Gupta <sidgup@codeaurora.org>
Tested-by: Siddharth Gupta <sidgup@codeaurora.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20210120204631.274206-4-hch@lst.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/kernfs/file.c b/fs/kernfs/file.c
index b1a5ccc..c757193 100644 (file)
--- a/fs/kernfs/file.c
+++ b/fs/kernfs/file.c
@@ -949,6 +949,8 @@ const struct file_operations kernfs_file_fops = {
        .release        = kernfs_fop_release,
        .poll           = kernfs_fop_poll,
        .fsync          = noop_fsync,
+       .splice_read    = generic_file_splice_read,
+       .splice_write   = iter_file_splice_write,
 };
 
 /**