[GFS2] Detach buf data during in-place writeback

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.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/fs/gfs2/log.c b/fs/gfs2/log.c
index f7c0608332fb..00ab6c070a15 100644
--- a/fs/gfs2/log.c
+++ b/fs/gfs2/log.c
@@ -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);
         }
 }