Commit 43838685 authored Sep 07, 2015 by Yan, Zheng Committed by Ilya Dryomov Sep 09, 2015

ceph: improve readahead for file holes



When readahead encounters file holes, osd reply returns error -ENOENT,
finish_read() skips adding pages to the the page cache. So readahead
does not work for file holes. The fix is adding zero pages to the
page cache when -ENOENT is returned.

Signed-off-by: Yan, Zheng <zyan@redhat.com>

parent 55b0b31c

fs/ceph/addr.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -276,7 +276,7 @@ static void finish_read(struct ceph_osd_request req, struct ceph_msg msg)
		for (i = 0; i < num_pages; i++) {
		struct page *page = osd_data->pages[i];

		if (rc < 0)
		if (rc < 0 && rc != ENOENT)
		goto unlock;
		if (bytes < (int)PAGE_CACHE_SIZE) {
		/* zero (remainder of) page */