Commit 1bb7322f authored by Steven Whitehouse's avatar Steven Whitehouse
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GFS2: Fix up jdata writepage/delete_inode 



There is a bug in writepage and delete_inode which allows jdata files to
invalidate pages from the address space without being in a transaction at
the time. This causes problems in case the pages are in the journal. This
patch fixes that case and prevents the resulting oops.

Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>
parent b2760583

fs/gfs2/ops_address.c

+7 −9
Original line number Diff line number Diff line
@@ -210,25 +210,23 @@ static int gfs2_jdata_writepage(struct page *page, struct writeback_control *wbc 
{

	struct inode *inode = page->mapping->host;

	struct gfs2_sbd *sdp = GFS2_SB(inode);

	int error;

	int ret;

	int done_trans = 0;



	error = gfs2_writepage_common(page, wbc);

	if (error <= 0)

		return error;



	if (PageChecked(page)) {

		if (wbc->sync_mode != WB_SYNC_ALL)

			goto out_ignore;

		error = gfs2_trans_begin(sdp, RES_DINODE + 1, 0);

		if (error)

		ret = gfs2_trans_begin(sdp, RES_DINODE + 1, 0);

		if (ret)

			goto out_ignore;

		done_trans = 1;

	}

	error = __gfs2_jdata_writepage(page, wbc);

	ret = gfs2_writepage_common(page, wbc);

	if (ret > 0)

		ret = __gfs2_jdata_writepage(page, wbc);

	if (done_trans)

		gfs2_trans_end(sdp);

	return error;

	return ret;



out_ignore:

	redirty_page_for_writepage(wbc, page);

fs/gfs2/ops_super.c

+4 −3
Original line number Diff line number Diff line
@@ -493,7 +493,7 @@ static void gfs2_delete_inode(struct inode *inode) 
	gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, &ip->i_iopen_gh);

	error = gfs2_glock_nq(&ip->i_iopen_gh);

	if (error)

		goto out_uninit;

		goto out_truncate;



	if (S_ISDIR(inode->i_mode) &&

	    (ip->i_di.di_flags & GFS2_DIF_EXHASH)) {
@@ -518,6 +518,7 @@ static void gfs2_delete_inode(struct inode *inode) 
	if (error)

		goto out_unlock;



out_truncate:

	error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);

	if (error)

		goto out_unlock;
@@ -526,8 +527,8 @@ static void gfs2_delete_inode(struct inode *inode) 
	gfs2_trans_end(sdp);



out_unlock:

	if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags))

		gfs2_glock_dq(&ip->i_iopen_gh);

out_uninit:

	gfs2_holder_uninit(&ip->i_iopen_gh);

	gfs2_glock_dq_uninit(&gh);

	if (error && error != GLR_TRYFAILED)

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