pipe: don't use ->i_mutex
now it can be done - put mutex into pipe_inode_info, use it instead
of ->i_mutex
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/include/linux/pipe_fs_i.h b/include/linux/pipe_fs_i.h
index 59778e1..d803a85 100644
--- a/include/linux/pipe_fs_i.h
+++ b/include/linux/pipe_fs_i.h
@@ -27,6 +27,7 @@
/**
* struct pipe_inode_info - a linux kernel pipe
+ * @mutex: mutex protecting the whole thing
* @wait: reader/writer wait point in case of empty/full pipe
* @nrbufs: the number of non-empty pipe buffers in this pipe
* @buffers: total number of buffers (should be a power of 2)
@@ -44,6 +45,7 @@
* @bufs: the circular array of pipe buffers
**/
struct pipe_inode_info {
+ struct mutex mutex;
wait_queue_head_t wait;
unsigned int nrbufs, curbuf, buffers;
unsigned int readers;