pipe: change the ->pin() operation to ->confirm()

The name 'pin' was badly chosen, it doesn't pin a pipe buffer
in the most commonly used sense in the kernel. So change the
name to 'confirm', after debating this issue with Hugh
Dickins a bit.

A good return from ->confirm() means that the buffer is really
there, and that the contents are good.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

1 files changed, 5 insertions, 4 deletions

diff --git a/fs/pipe.c b/fs/pipe.c
index 3a89592bdf57..3694af10dd2c 100644
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -203,7 +203,8 @@ void generic_pipe_buf_get(struct pipe_inode_info *info, struct pipe_buffer *buf)
         page_cache_get(buf->page);
 }
 
-int generic_pipe_buf_pin(struct pipe_inode_info *info, struct pipe_buffer *buf)
+int generic_pipe_buf_confirm(struct pipe_inode_info *info,
+                             struct pipe_buffer *buf)
 {
         return 0;
 }
@@ -212,7 +213,7 @@ static const struct pipe_buf_operations anon_pipe_buf_ops = {
         .can_merge = 1,
         .map = generic_pipe_buf_map,
         .unmap = generic_pipe_buf_unmap,
-        .pin = generic_pipe_buf_pin,
+        .confirm = generic_pipe_buf_confirm,
         .release = anon_pipe_buf_release,
         .steal = generic_pipe_buf_steal,
         .get = generic_pipe_buf_get,
@@ -252,7 +253,7 @@ pipe_read(struct kiocb *iocb, const struct iovec *_iov,
                         if (chars > total_len)
                                 chars = total_len;
 
-                        error = ops->pin(pipe, buf);
+                        error = ops->confirm(pipe, buf);
                         if (error) {
                                 if (!ret)
                                         error = ret;
@@ -373,7 +374,7 @@ pipe_write(struct kiocb *iocb, const struct iovec *_iov,
                         int error, atomic = 1;
                         void *addr;
 
-                        error = ops->pin(pipe, buf);
+                        error = ops->confirm(pipe, buf);
                         if (error)
                                 goto out;