fuse: use iov_iter based generic splice helpers

The default splice implementation is grossly inefficient and the iter based
ones work just fine, so use those instead.  I've measured an 8x speedup for
splice write (with len = 128k).

Signed-off-by: Miklos Szeredi <[email protected]>

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 383843c7c0e97eda3b534905d420f148a9f627e1..3e9e57c765f7c9a5a74c9e2582179095666273f5 100644 (file)
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -3156,6 +3156,7 @@ static const struct file_operations fuse_file_operations = {
        .lock           = fuse_file_lock,
        .flock          = fuse_file_flock,
        .splice_read    = generic_file_splice_read,
+       .splice_write   = iter_file_splice_write,
        .unlocked_ioctl = fuse_file_ioctl,
        .compat_ioctl   = fuse_file_compat_ioctl,
        .poll           = fuse_file_poll,
@@ -3174,11 +3175,12 @@ static const struct file_operations fuse_direct_io_file_operations = {
        .fsync          = fuse_fsync,
        .lock           = fuse_file_lock,
        .flock          = fuse_file_flock,
+       .splice_read    = generic_file_splice_read,
+       .splice_write   = iter_file_splice_write,
        .unlocked_ioctl = fuse_file_ioctl,
        .compat_ioctl   = fuse_file_compat_ioctl,
        .poll           = fuse_file_poll,
        .fallocate      = fuse_file_fallocate,
-       /* no splice_read */
 };
 
 static const struct address_space_operations fuse_file_aops  = {