gfs2: Put bitmap buffers in put_super

commit 10283ea525d30f2e99828978fd04d8427876a7ad upstream.

gfs2_put_super calls gfs2_clear_rgrpd to destroy the gfs2_rgrpd objects
attached to the resource group glocks.  That function should release the
buffers attached to the gfs2_bitmap objects (bi_bh), but the call to
gfs2_rgrp_brelse for doing that is missing.

When gfs2_releasepage later runs across these buffers which are still
referenced, it refuses to free them.  This causes the pages the buffers
are attached to to remain referenced as well.  With enough mount/unmount
cycles, the system will eventually run out of memory.

Fix this by adding the missing call to gfs2_rgrp_brelse in
gfs2_clear_rgrpd.

(Also fix a gfs2_rgrp_relse -> gfs2_rgrp_brelse typo in a comment.)

Fixes: 39b0f1e92908 ("GFS2: Don't brelse rgrp buffer_heads every allocation")
Cc: stable@vger.kernel.org # v4.2+
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
index 5fe033131f0361d04b12d7ef40fb726de1959eed..b0eee90738ff468fa11e2e8c64d483ce409db207 100644 (file)
--- a/fs/gfs2/rgrp.c
+++ b/fs/gfs2/rgrp.c
@@ -706,6 +706,7 @@ void gfs2_clear_rgrpd(struct gfs2_sbd *sdp)
 
                if (gl) {
                        glock_clear_object(gl, rgd);
+                       gfs2_rgrp_brelse(rgd);
                        gfs2_glock_put(gl);
                }
 
@@ -1115,7 +1116,7 @@ static u32 count_unlinked(struct gfs2_rgrpd *rgd)
  * @rgd: the struct gfs2_rgrpd describing the RG to read in
  *
  * Read in all of a Resource Group's header and bitmap blocks.
- * Caller must eventually call gfs2_rgrp_relse() to free the bitmaps.
+ * Caller must eventually call gfs2_rgrp_brelse() to free the bitmaps.
  *
  * Returns: errno
  */