[PATCH] splice: add a SPLICE_F_MORE flag

This lets userspace indicate whether more data will be coming in a
subsequent splice call.

Signed-off-by: Jens Axboe <axboe@suse.de>

2 files changed, 4 insertions, 2 deletions

diff --git a/fs/splice.c b/fs/splice.c
index 34591924c783..e84544558946 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -354,6 +354,7 @@ static int pipe_to_sendpage(struct pipe_inode_info *info,
         unsigned int offset;
         ssize_t ret;
         void *ptr;
+        int more;
 
         /*
          * sub-optimal, but we are limited by the pipe ->map. we don't
@@ -366,9 +367,9 @@ static int pipe_to_sendpage(struct pipe_inode_info *info,
                 return PTR_ERR(ptr);
 
         offset = pos & ~PAGE_CACHE_MASK;
+        more = (sd->flags & SPLICE_F_MORE) || sd->len < sd->total_len;
 
-        ret = file->f_op->sendpage(file, buf->page, offset, sd->len, &pos,
-                                        sd->len < sd->total_len);
+        ret = file->f_op->sendpage(file, buf->page, offset, sd->len, &pos,more);
 
         buf->ops->unmap(info, buf);
         if (ret == sd->len)
diff --git a/include/linux/pipe_fs_i.h b/include/linux/pipe_fs_i.h
index 32865004751c..70ae9332ec16 100644
--- a/include/linux/pipe_fs_i.h
+++ b/include/linux/pipe_fs_i.h
@@ -62,5 +62,6 @@ void free_pipe_info(struct inode* inode);
 #define SPLICE_F_NONBLOCK (0x02) /* don't block on the pipe splicing (but */
                                  /* we may still block on the fd we splice */
                                  /* from/to, of course */
+#define SPLICE_F_MORE   (0x04)  /* expect more data */
 
 #endif