ceph: convert ceph_readpages to ceph_readahead
Convert ceph_readpages to ceph_readahead and make it use netfs_readahead. With this we can rip out a lot of the old readpage/readpages infrastructure. Signed-off-by: Jeff Layton <jlayton@kernel.org> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Jeff Layton
Ilya Dryomov
Родитель
d801327d95
Коммит
4987005600
234
fs/ceph/addr.c
234
fs/ceph/addr.c
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@ -305,6 +305,16 @@ static void ceph_init_rreq(struct netfs_read_request *rreq, struct file *file)
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{
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}
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static void ceph_readahead_cleanup(struct address_space *mapping, void *priv)
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{
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struct inode *inode = mapping->host;
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struct ceph_inode_info *ci = ceph_inode(inode);
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int got = (uintptr_t)priv;
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if (got)
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ceph_put_cap_refs(ci, got);
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}
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const struct netfs_read_request_ops ceph_netfs_read_ops = {
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.init_rreq = ceph_init_rreq,
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.is_cache_enabled = ceph_is_cache_enabled,
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@ -313,6 +323,7 @@ const struct netfs_read_request_ops ceph_netfs_read_ops = {
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.expand_readahead = ceph_netfs_expand_readahead,
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.clamp_length = ceph_netfs_clamp_length,
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.check_write_begin = ceph_netfs_check_write_begin,
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.cleanup = ceph_readahead_cleanup,
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};
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/* read a single page, without unlocking it. */
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@ -345,214 +356,35 @@ static int ceph_readpage(struct file *file, struct page *page)
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return netfs_readpage(file, page, &ceph_netfs_read_ops, NULL);
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}
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/*
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* Finish an async read(ahead) op.
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*/
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static void finish_read(struct ceph_osd_request *req)
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static void ceph_readahead(struct readahead_control *ractl)
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{
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struct inode *inode = req->r_inode;
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struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
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struct ceph_osd_data *osd_data;
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int rc = req->r_result <= 0 ? req->r_result : 0;
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int bytes = req->r_result >= 0 ? req->r_result : 0;
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int num_pages;
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int i;
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dout("finish_read %p req %p rc %d bytes %d\n", inode, req, rc, bytes);
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if (rc == -EBLOCKLISTED)
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ceph_inode_to_client(inode)->blocklisted = true;
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/* unlock all pages, zeroing any data we didn't read */
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osd_data = osd_req_op_extent_osd_data(req, 0);
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BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES);
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num_pages = calc_pages_for((u64)osd_data->alignment,
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(u64)osd_data->length);
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for (i = 0; i < num_pages; i++) {
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struct page *page = osd_data->pages[i];
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if (rc < 0 && rc != -ENOENT)
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goto unlock;
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if (bytes < (int)PAGE_SIZE) {
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/* zero (remainder of) page */
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int s = bytes < 0 ? 0 : bytes;
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zero_user_segment(page, s, PAGE_SIZE);
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}
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dout("finish_read %p uptodate %p idx %lu\n", inode, page,
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page->index);
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flush_dcache_page(page);
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SetPageUptodate(page);
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unlock:
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unlock_page(page);
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put_page(page);
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bytes -= PAGE_SIZE;
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}
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ceph_update_read_latency(&fsc->mdsc->metric, req->r_start_latency,
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req->r_end_latency, rc);
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kfree(osd_data->pages);
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}
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/*
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* start an async read(ahead) operation. return nr_pages we submitted
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* a read for on success, or negative error code.
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*/
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static int start_read(struct inode *inode, struct ceph_rw_context *rw_ctx,
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struct list_head *page_list, int max)
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{
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struct ceph_osd_client *osdc =
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&ceph_inode_to_client(inode)->client->osdc;
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struct ceph_inode_info *ci = ceph_inode(inode);
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struct page *page = lru_to_page(page_list);
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struct ceph_vino vino;
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struct ceph_osd_request *req;
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u64 off;
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u64 len;
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int i;
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struct page **pages;
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pgoff_t next_index;
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int nr_pages = 0;
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struct inode *inode = file_inode(ractl->file);
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struct ceph_file_info *fi = ractl->file->private_data;
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struct ceph_rw_context *rw_ctx;
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int got = 0;
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int ret = 0;
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if (!rw_ctx) {
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/* caller of readpages does not hold buffer and read caps
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* (fadvise, madvise and readahead cases) */
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int want = CEPH_CAP_FILE_CACHE;
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ret = ceph_try_get_caps(inode, CEPH_CAP_FILE_RD, want,
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true, &got);
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if (ret < 0) {
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dout("start_read %p, error getting cap\n", inode);
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} else if (!(got & want)) {
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dout("start_read %p, no cache cap\n", inode);
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ret = 0;
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}
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if (ret <= 0) {
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if (got)
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ceph_put_cap_refs(ci, got);
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while (!list_empty(page_list)) {
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page = lru_to_page(page_list);
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list_del(&page->lru);
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put_page(page);
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}
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return ret;
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}
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}
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off = (u64) page_offset(page);
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/* count pages */
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next_index = page->index;
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list_for_each_entry_reverse(page, page_list, lru) {
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if (page->index != next_index)
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break;
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nr_pages++;
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next_index++;
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if (max && nr_pages == max)
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break;
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}
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len = nr_pages << PAGE_SHIFT;
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dout("start_read %p nr_pages %d is %lld~%lld\n", inode, nr_pages,
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off, len);
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vino = ceph_vino(inode);
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req = ceph_osdc_new_request(osdc, &ci->i_layout, vino, off, &len,
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0, 1, CEPH_OSD_OP_READ,
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CEPH_OSD_FLAG_READ, NULL,
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ci->i_truncate_seq, ci->i_truncate_size,
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false);
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if (IS_ERR(req)) {
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ret = PTR_ERR(req);
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goto out;
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}
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/* build page vector */
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nr_pages = calc_pages_for(0, len);
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pages = kmalloc_array(nr_pages, sizeof(*pages), GFP_KERNEL);
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if (!pages) {
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ret = -ENOMEM;
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goto out_put;
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}
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for (i = 0; i < nr_pages; ++i) {
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page = list_entry(page_list->prev, struct page, lru);
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BUG_ON(PageLocked(page));
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list_del(&page->lru);
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dout("start_read %p adding %p idx %lu\n", inode, page,
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page->index);
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if (add_to_page_cache_lru(page, &inode->i_data, page->index,
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GFP_KERNEL)) {
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put_page(page);
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dout("start_read %p add_to_page_cache failed %p\n",
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inode, page);
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nr_pages = i;
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if (nr_pages > 0) {
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len = nr_pages << PAGE_SHIFT;
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osd_req_op_extent_update(req, 0, len);
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break;
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}
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goto out_pages;
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}
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pages[i] = page;
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}
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osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, false, false);
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req->r_callback = finish_read;
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req->r_inode = inode;
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dout("start_read %p starting %p %lld~%lld\n", inode, req, off, len);
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ret = ceph_osdc_start_request(osdc, req, false);
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if (ret < 0)
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goto out_pages;
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ceph_osdc_put_request(req);
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/* After adding locked pages to page cache, the inode holds cache cap.
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* So we can drop our cap refs. */
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if (got)
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ceph_put_cap_refs(ci, got);
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return nr_pages;
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out_pages:
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for (i = 0; i < nr_pages; ++i)
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unlock_page(pages[i]);
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ceph_put_page_vector(pages, nr_pages, false);
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out_put:
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ceph_osdc_put_request(req);
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out:
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if (got)
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ceph_put_cap_refs(ci, got);
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return ret;
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}
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/*
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* Read multiple pages. Leave pages we don't read + unlock in page_list;
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* the caller (VM) cleans them up.
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*/
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static int ceph_readpages(struct file *file, struct address_space *mapping,
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struct list_head *page_list, unsigned nr_pages)
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{
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struct inode *inode = file_inode(file);
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struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
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struct ceph_file_info *fi = file->private_data;
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struct ceph_rw_context *rw_ctx;
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int rc = 0;
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int max = 0;
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if (ceph_inode(inode)->i_inline_version != CEPH_INLINE_NONE)
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return -EINVAL;
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return;
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rw_ctx = ceph_find_rw_context(fi);
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max = fsc->mount_options->rsize >> PAGE_SHIFT;
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dout("readpages %p file %p ctx %p nr_pages %d max %d\n",
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inode, file, rw_ctx, nr_pages, max);
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while (!list_empty(page_list)) {
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rc = start_read(inode, rw_ctx, page_list, max);
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if (rc < 0)
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goto out;
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if (!rw_ctx) {
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/*
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* readahead callers do not necessarily hold Fcb caps
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* (e.g. fadvise, madvise).
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*/
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int want = CEPH_CAP_FILE_CACHE;
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ret = ceph_try_get_caps(inode, CEPH_CAP_FILE_RD, want, true, &got);
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if (ret < 0)
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dout("start_read %p, error getting cap\n", inode);
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else if (!(got & want))
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dout("start_read %p, no cache cap\n", inode);
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if (ret <= 0)
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return;
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}
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out:
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dout("readpages %p file %p ret %d\n", inode, file, rc);
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return rc;
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netfs_readahead(ractl, &ceph_netfs_read_ops, (void *)(uintptr_t)got);
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}
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struct ceph_writeback_ctl
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@ -1497,7 +1329,7 @@ static ssize_t ceph_direct_io(struct kiocb *iocb, struct iov_iter *iter)
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const struct address_space_operations ceph_aops = {
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.readpage = ceph_readpage,
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.readpages = ceph_readpages,
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.readahead = ceph_readahead,
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.writepage = ceph_writepage,
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.writepages = ceph_writepages_start,
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.write_begin = ceph_write_begin,
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