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authorJens Axboe <jens.axboe@oracle.com>2010-05-20 10:43:18 +0200
committerJens Axboe <jens.axboe@oracle.com>2010-05-21 21:12:40 +0200
commit35f3d14dbbc58447c61e38a162ea10add6b31dc7 (patch)
tree3e03cd540b7dcdac82195c4e76862c0ce6daaaf0 /include/linux/pipe_fs_i.h
parent3d42b3612891baecf709d93f28655a6882a65d41 (diff)
downloadop-kernel-dev-35f3d14dbbc58447c61e38a162ea10add6b31dc7.zip
op-kernel-dev-35f3d14dbbc58447c61e38a162ea10add6b31dc7.tar.gz
pipe: add support for shrinking and growing pipes
This patch adds F_GETPIPE_SZ and F_SETPIPE_SZ fcntl() actions for growing and shrinking the size of a pipe and adjusts pipe.c and splice.c (and relay and network splice) usage to work with these larger (or smaller) pipes. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'include/linux/pipe_fs_i.h')
-rw-r--r--include/linux/pipe_fs_i.h11
1 files changed, 7 insertions, 4 deletions
diff --git a/include/linux/pipe_fs_i.h b/include/linux/pipe_fs_i.h
index b43a9e0..65f4282 100644
--- a/include/linux/pipe_fs_i.h
+++ b/include/linux/pipe_fs_i.h
@@ -3,7 +3,7 @@
#define PIPEFS_MAGIC 0x50495045
-#define PIPE_BUFFERS (16)
+#define PIPE_DEF_BUFFERS 16
#define PIPE_BUF_FLAG_LRU 0x01 /* page is on the LRU */
#define PIPE_BUF_FLAG_ATOMIC 0x02 /* was atomically mapped */
@@ -44,17 +44,17 @@ struct pipe_buffer {
**/
struct pipe_inode_info {
wait_queue_head_t wait;
- unsigned int nrbufs, curbuf;
- struct page *tmp_page;
+ unsigned int nrbufs, curbuf, buffers;
unsigned int readers;
unsigned int writers;
unsigned int waiting_writers;
unsigned int r_counter;
unsigned int w_counter;
+ struct page *tmp_page;
struct fasync_struct *fasync_readers;
struct fasync_struct *fasync_writers;
struct inode *inode;
- struct pipe_buffer bufs[PIPE_BUFFERS];
+ struct pipe_buffer *bufs;
};
/*
@@ -154,4 +154,7 @@ int generic_pipe_buf_confirm(struct pipe_inode_info *, struct pipe_buffer *);
int generic_pipe_buf_steal(struct pipe_inode_info *, struct pipe_buffer *);
void generic_pipe_buf_release(struct pipe_inode_info *, struct pipe_buffer *);
+/* for F_SETPIPE_SZ and F_GETPIPE_SZ */
+long pipe_fcntl(struct file *, unsigned int, unsigned long arg);
+
#endif
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