2013/03/20 4:31, Jan Kara wrote:
I'm not sure I understand. Looking into dio_send_cur_page() it seems may prematurely submit the bio if sdio->boundary is set - in that case we should probably first try to add the page to the bio and submit the bio only after that. Is that what you mean?
I think the direct I/O works for each page into buffer_head by the following three steps: 1. submit sdio->bio if sdio->boudary is set 2. add sdio->cur_page to sdio->bio by dio_new_bio() or dio_bio_add_page() 3. set the curret page to sdio->cur_page in submit_page_section() It is true that dio_send_cur_page() submits the bio if sdio->boudary is set. However, at this time, this bio does not contain sdio->cur_page and the current page do_direct_IO() passed. Regards, Kazuya Mio -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
