Bz #248176: GFS2: invalid metadata block - TRY 3

Okay, here is patch 5 again. The difference between the patches that applied and those that didn't seems to be that git-diff worked and my normal diff didn't. I used diff -pu to generate the "bad" patches, which had always worked for me in the past, so I'm not sure why it isn't now. Perhaps someone can suggest additional parms to diff.
----------------------
This is patch 5 of 5 for bug #248176

Metadata corruption was occurring because page references weren't being removed in all cases. I previously added a function called detach_bufdata, but I discovered there already WAS a function out there to do the job. It's called gfs2_meta_cache_flush. So I added a call to that to remove the page references.
Recently I had been thinking that this was entirely unnecessary, but when I removed the code, the metadata corruption problem returned immediately.
--

Signed-off-by Bob Peterson <[email protected]>

--

 fs/gfs2/log.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

fs/gfs2/log.c +3 -0

index f7c0608..00ab6c0 100644
@@ -219,6 +219,7 @@ static void gfs2_ail2_empty_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
 {
 	struct list_head *head = &ai->ai_ail2_list;
 	struct gfs2_bufdata *bd;
+	struct gfs2_inode *bh_ip;
 
 	while (!list_empty(head)) {
 		bd = list_entry(head->prev, struct gfs2_bufdata,

@@ -228,6 +229,8 @@ static void gfs2_ail2_empty_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
 		list_del(&bd->bd_ail_st_list);
 		list_del(&bd->bd_ail_gl_list);
 		atomic_dec(&bd->bd_gl->gl_ail_count);
+		bh_ip = GFS2_I(bd->bd_bh->b_page->mapping->host);
+		gfs2_meta_cache_flush(bh_ip);
 		brelse(bd->bd_bh);
 	}
 }