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Commit 05455e11 authored by Yan, Zheng's avatar Yan, Zheng Committed by Ilya Dryomov
Browse files

ceph: make writepage_nounlock() invalidate page that beyonds EOF 



Otherwise, the page left in state that page is associated with a
snapc, but (PageDirty(page) || PageWriteback(page)) is false.

Signed-off-by: default avatar"Yan, Zheng" <zyan@redhat.com>
Signed-off-by: default avatarIlya Dryomov <idryomov@gmail.com>
parent 1f934b00

fs/ceph/addr.c

+32 −18
Original line number Diff line number Diff line
@@ -476,7 +476,8 @@ struct ceph_writeback_ctl 
 * only snap context we are allowed to write back.

 */

static struct ceph_snap_context *

get_oldest_context(struct inode *inode, struct ceph_writeback_ctl *ctl)

get_oldest_context(struct inode *inode, struct ceph_writeback_ctl *ctl,

		   struct ceph_snap_context *page_snapc)

{

	struct ceph_inode_info *ci = ceph_inode(inode);

	struct ceph_snap_context *snapc = NULL;
@@ -486,8 +487,13 @@ get_oldest_context(struct inode *inode, struct ceph_writeback_ctl *ctl) 
	list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {

		dout(" cap_snap %p snapc %p has %d dirty pages\n", capsnap,

		     capsnap->context, capsnap->dirty_pages);

		if (capsnap->dirty_pages) {

			snapc = ceph_get_snap_context(capsnap->context);

		if (!capsnap->dirty_pages)

			continue;



		/* get i_size, truncate_{seq,size} for page_snapc? */

		if (snapc && capsnap->context != page_snapc)

			continue;



		if (ctl) {

			if (capsnap->writing) {

				ctl->i_size = i_size_read(inode);
@@ -499,8 +505,15 @@ get_oldest_context(struct inode *inode, struct ceph_writeback_ctl *ctl) 
			ctl->truncate_size = capsnap->truncate_size;

			ctl->truncate_seq = capsnap->truncate_seq;

		}



		if (snapc)

			break;



		snapc = ceph_get_snap_context(capsnap->context);

		if (!page_snapc ||

		    page_snapc == snapc ||

		    page_snapc->seq > snapc->seq)

			break;

		}

	}

	if (!snapc && ci->i_wrbuffer_ref_head) {

		snapc = ceph_get_snap_context(ci->i_head_snapc);
@@ -573,7 +586,7 @@ static int writepage_nounlock(struct page *page, struct writeback_control *wbc) 
		dout("writepage %p page %p not dirty?\n", inode, page);

		return 0;

	}

	oldest = get_oldest_context(inode, &ceph_wbc);

	oldest = get_oldest_context(inode, &ceph_wbc, snapc);

	if (snapc->seq > oldest->seq) {

		dout("writepage %p page %p snapc %p not writeable - noop\n",

		     inode, page, snapc);
@@ -588,6 +601,7 @@ static int writepage_nounlock(struct page *page, struct writeback_control *wbc) 
	/* is this a partial page at end of file? */

	if (page_off >= ceph_wbc.i_size) {

		dout("%p page eof %llu\n", page, ceph_wbc.i_size);

		page->mapping->a_ops->invalidatepage(page, 0, PAGE_SIZE);

		return 0;

	}
@@ -816,7 +830,7 @@ static int ceph_writepages_start(struct address_space *mapping, 
retry:

	/* find oldest snap context with dirty data */

	ceph_put_snap_context(snapc);

	snapc = get_oldest_context(inode, &ceph_wbc);

	snapc = get_oldest_context(inode, &ceph_wbc, NULL);

	if (!snapc) {

		/* hmm, why does writepages get called when there

		   is no dirty data? */
@@ -1162,7 +1176,7 @@ static int ceph_writepages_start(struct address_space *mapping, 
static int context_is_writeable_or_written(struct inode *inode,

					   struct ceph_snap_context *snapc)

{

	struct ceph_snap_context *oldest = get_oldest_context(inode, NULL);

	struct ceph_snap_context *oldest = get_oldest_context(inode, NULL, NULL);

	int ret = !oldest || snapc->seq <= oldest->seq;



	ceph_put_snap_context(oldest);
@@ -1207,7 +1221,7 @@ static int ceph_update_writeable_page(struct file *file, 
		 * this page is already dirty in another (older) snap

		 * context!  is it writeable now?

		 */

		oldest = get_oldest_context(inode, NULL);

		oldest = get_oldest_context(inode, NULL, NULL);

		if (snapc->seq > oldest->seq) {

			ceph_put_snap_context(oldest);

			dout(" page %p snapc %p not current or oldest\n",