Make the maximum pipe size referable from a kernel module.
The /proc/sys/fs/pipe-max-size defines an upper limit for the
capacity of a pipe. It is also used as an upper limit of a
fuse read/write request size in this patch series. So, it
is necessary to make it referable from a kernel module.
Signed-off-by: Mitsuo Hayasaka <mitsuo.hayasaka.hu@xxxxxxxxxxx>
Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Muthukumar R <muthur@xxxxxxxxx>
Cc: Miklos Szeredi <miklos@xxxxxxxxxx>
---
fs/pipe.c | 7 +++++++
include/linux/pipe_fs_i.h | 3 +++
2 files changed, 10 insertions(+), 0 deletions(-)
diff --git a/fs/pipe.c b/fs/pipe.c
index 49c1065..f0f3768 100644
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -36,6 +36,13 @@ unsigned int pipe_max_size = 1048576;
*/
unsigned int pipe_min_size = PAGE_SIZE;
+/* get pipe_max_size */
+unsigned int pipe_get_max_size(void)
+{
+ return pipe_max_size;
+}
+EXPORT_SYMBOL(pipe_get_max_size);
+
/*
* We use a start+len construction, which provides full use of the
* allocated memory.
diff --git a/include/linux/pipe_fs_i.h b/include/linux/pipe_fs_i.h
index e1ac1ce..50a16dd 100644
--- a/include/linux/pipe_fs_i.h
+++ b/include/linux/pipe_fs_i.h
@@ -134,6 +134,9 @@ struct pipe_buf_operations {
memory allocation, whereas PIPE_BUF makes atomicity guarantees. */
#define PIPE_SIZE PAGE_SIZE
+/* get pipe_max_size */
+unsigned int pipe_get_max_size(void);
+
/* Pipe lock and unlock operations */
void pipe_lock(struct pipe_inode_info *);
void pipe_unlock(struct pipe_inode_info *);
--
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