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fuse: rework fuse_readpages()
The patch uses 'nr_pages' argument of fuse_readpages() as heuristics for the number of page pointers to allocate. This can be improved further by taking in consideration fc->max_read and gaps between page indices, but it's not clear whether it's worthy or not. Signed-off-by: Maxim Patlasov <mpatlasov@parallels.com> Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
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1 changed files with 14 additions and 2 deletions
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@ -641,6 +641,7 @@ struct fuse_fill_data {
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struct fuse_req *req;
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struct file *file;
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struct inode *inode;
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unsigned nr_pages;
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};
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static int fuse_readpages_fill(void *_data, struct page *page)
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@ -656,16 +657,25 @@ static int fuse_readpages_fill(void *_data, struct page *page)
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(req->num_pages == FUSE_MAX_PAGES_PER_REQ ||
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(req->num_pages + 1) * PAGE_CACHE_SIZE > fc->max_read ||
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req->pages[req->num_pages - 1]->index + 1 != page->index)) {
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int nr_alloc = min_t(unsigned, data->nr_pages,
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FUSE_MAX_PAGES_PER_REQ);
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fuse_send_readpages(req, data->file);
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data->req = req = fuse_get_req(fc, FUSE_MAX_PAGES_PER_REQ);
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data->req = req = fuse_get_req(fc, nr_alloc);
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if (IS_ERR(req)) {
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unlock_page(page);
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return PTR_ERR(req);
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}
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}
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if (WARN_ON(req->num_pages >= req->max_pages)) {
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fuse_put_request(fc, req);
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return -EIO;
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}
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page_cache_get(page);
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req->pages[req->num_pages] = page;
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req->num_pages++;
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data->nr_pages--;
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return 0;
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}
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@ -676,6 +686,7 @@ static int fuse_readpages(struct file *file, struct address_space *mapping,
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struct fuse_conn *fc = get_fuse_conn(inode);
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struct fuse_fill_data data;
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int err;
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int nr_alloc = min_t(unsigned, nr_pages, FUSE_MAX_PAGES_PER_REQ);
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err = -EIO;
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if (is_bad_inode(inode))
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@ -683,7 +694,8 @@ static int fuse_readpages(struct file *file, struct address_space *mapping,
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data.file = file;
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data.inode = inode;
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data.req = fuse_get_req(fc, FUSE_MAX_PAGES_PER_REQ);
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data.req = fuse_get_req(fc, nr_alloc);
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data.nr_pages = nr_pages;
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err = PTR_ERR(data.req);
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if (IS_ERR(data.req))
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goto out;
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