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GFS2: Fix up jdata writepage/delete_inode

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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: Steven Whitehouse <swhiteho@redhat.com>
This commit is contained in:
Steven Whitehouse 2008-10-15 09:46:39 +01:00
parent b276058371
commit 1bb7322fd0
2 changed files with 11 additions and 12 deletions
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16
fs/gfs2/ops_address.c
View file

@ -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);

7
fs/gfs2/ops_super.c
View file

@ -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:
gfs2_glock_dq(&ip->i_iopen_gh);
out_uninit:
if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags))
gfs2_glock_dq(&ip->i_iopen_gh);
gfs2_holder_uninit(&ip->i_iopen_gh);
gfs2_glock_dq_uninit(&gh);
if (error && error != GLR_TRYFAILED)