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authorJens Axboe <axboe@suse.de>2006-04-30 16:36:32 +0200
committerJens Axboe <axboe@suse.de>2006-04-30 16:36:32 +0200
commit46e678c96bbd775abd05d3ddbe2fd334794f9157 (patch)
treef82b77d9f2fd5d4eb5e66bc2bb8ff5df63db3c7f /fs/pipe.c
parente0a515bc6a2188f02916e976f419a8640312e32a (diff)
downloadop-kernel-dev-46e678c96bbd775abd05d3ddbe2fd334794f9157.zip
op-kernel-dev-46e678c96bbd775abd05d3ddbe2fd334794f9157.tar.gz
[PATCH] splice: fix bugs with stealing regular pipe pages
- Check that page has suitable count for stealing in the regular pipes. - pipe_to_file() assumes that the page is locked on succesful steal, so do that in the pipe steal hook - Missing unlock_page() in add_to_page_cache() failure. Signed-off-by: Jens Axboe <axboe@suse.de>
Diffstat (limited to 'fs/pipe.c')
-rw-r--r--fs/pipe.c11
1 files changed, 9 insertions, 2 deletions
diff --git a/fs/pipe.c b/fs/pipe.c
index 7fefb10..5a36927 100644
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -127,8 +127,15 @@ static void anon_pipe_buf_unmap(struct pipe_inode_info *pipe,
static int anon_pipe_buf_steal(struct pipe_inode_info *pipe,
struct pipe_buffer *buf)
{
- buf->flags |= PIPE_BUF_FLAG_STOLEN;
- return 0;
+ struct page *page = buf->page;
+
+ if (page_count(page) == 1) {
+ buf->flags |= PIPE_BUF_FLAG_STOLEN;
+ lock_page(page);
+ return 0;
+ }
+
+ return 1;
}
static void anon_pipe_buf_get(struct pipe_inode_info *info,
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