fuse: get page reference for readpages

Acquire a page ref on pages in ->readpages() and release them when the
read has finished.  Not acquiring a reference didn't seem to cause any
trouble since the page is locked and will not be kicked out of the
page cache during the read.

However the following patches will want to remove the page from the
cache so a separate ref is needed.  Making the reference in req->pages
explicit also makes the code easier to understand.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 29bda0564e69bef4725dec4c90a198ce047734d3..9ca68edcbdbe7d0f414691de1175a67651ed0023 100644 (file)
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -536,6 +536,7 @@ static void fuse_readpages_end(struct fuse_conn *fc, struct fuse_req *req)
                else
                        SetPageError(page);
                unlock_page(page);
+               page_cache_release(page);
        }
        if (req->ff)
                fuse_file_put(req->ff);
@@ -589,6 +590,7 @@ static int fuse_readpages_fill(void *_data, struct page *page)
                        return PTR_ERR(req);
                }
        }
+       page_cache_get(page);
        req->pages[req->num_pages] = page;
        req->num_pages++;
        return 0;