GFS2: fix recursive locking during rindex truncates

When you truncate the rindex file, you need to avoid calling gfs2_rindex_hold,
since you already hold it.  However, if you haven't already read in the
resource groups, you need to do that.

Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

3 files changed, 9 insertions, 3 deletions

diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c
index 5476c066d4ee..ae7d205de0d1 100644
--- a/fs/gfs2/bmap.c
+++ b/fs/gfs2/bmap.c
@@ -780,7 +780,11 @@ static int do_strip(struct gfs2_inode *ip, struct buffer_head *dibh,
         if (metadata)
                 revokes = (height) ? sdp->sd_inptrs : sdp->sd_diptrs;
 
-        error = gfs2_rindex_hold(sdp, &ip->i_alloc->al_ri_gh);
+        if (ip != GFS2_I(sdp->sd_rindex))
+                error = gfs2_rindex_hold(sdp, &ip->i_alloc->al_ri_gh);
+        else if (!sdp->sd_rgrps)
+                error = gfs2_ri_update(ip);
+
         if (error)
                 return error;
 
@@ -879,7 +883,8 @@ out_rg_gunlock:
 out_rlist:
         gfs2_rlist_free(&rlist);
 out:
-        gfs2_glock_dq_uninit(&ip->i_alloc->al_ri_gh);
+        if (ip != GFS2_I(sdp->sd_rindex))
+                gfs2_glock_dq_uninit(&ip->i_alloc->al_ri_gh);
         return error;
 }
 
diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
index 6375b3860a9a..25dbe5c84dff 100644
--- a/fs/gfs2/rgrp.c
+++ b/fs/gfs2/rgrp.c
@@ -583,7 +583,7 @@ static int read_rindex_entry(struct gfs2_inode *ip,
  * Returns: 0 on successful update, error code otherwise
  */
 
-static int gfs2_ri_update(struct gfs2_inode *ip)
+int gfs2_ri_update(struct gfs2_inode *ip)
 {
         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
         struct inode *inode = &ip->i_inode;
diff --git a/fs/gfs2/rgrp.h b/fs/gfs2/rgrp.h
index 0e35c0466f9a..50c2bb04369c 100644
--- a/fs/gfs2/rgrp.h
+++ b/fs/gfs2/rgrp.h
@@ -48,6 +48,7 @@ extern int gfs2_inplace_reserve_i(struct gfs2_inode *ip, int hold_rindex,
 
 extern void gfs2_inplace_release(struct gfs2_inode *ip);
 
+extern int gfs2_ri_update(struct gfs2_inode *ip);
 extern int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n);
 extern int gfs2_alloc_di(struct gfs2_inode *ip, u64 *bn, u64 *generation);