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[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>
wifi-calibration
Jens Axboe 2006-04-30 16:36:32 +02:00
parent e0a515bc6a
commit 46e678c96b
2 changed files with 12 additions and 3 deletions
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11
fs/pipe.c
View File

@ -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,

4
fs/splice.c
View File

@ -599,8 +599,10 @@ static int pipe_to_file(struct pipe_inode_info *info, struct pipe_buffer *buf,
goto find_page;
page = buf->page;
if (add_to_page_cache(page, mapping, index, gfp_mask))
if (add_to_page_cache(page, mapping, index, gfp_mask)) {
unlock_page(page);
goto find_page;
}
if (!(buf->flags & PIPE_BUF_FLAG_LRU))
lru_cache_add(page);