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authorBob Peterson <rpeterso@redhat.com>2020-02-17 14:14:13 -0600
committerBob Peterson <rpeterso@redhat.com>2020-02-27 07:53:18 -0600
commit019dd669bde14bc0748bc43af2f96e2c5e37d3f8 (patch)
tree1dbcf3a5bb0d50fd9f5bdf3f6465ddea2f733779 /fs/gfs2
parentca399c96e96e3f372f901a698a6fd17796b8ed32 (diff)
gfs2: don't allow releasepage to free bd still used for revokes
Before this patch, function gfs2_releasepage would free any bd elements that had been used for the page being released. However, those bd elements may still be queued to the sd_log_revokes list, in which case we cannot free them until the revoke has been issued. This patch adds additional checks for bds that are still being used for revokes. Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Diffstat (limited to 'fs/gfs2')
-rw-r--r--fs/gfs2/aops.c11
1 files changed, 8 insertions, 3 deletions
diff --git a/fs/gfs2/aops.c b/fs/gfs2/aops.c
index ba83b49ce18c..786c1ce8f030 100644
--- a/fs/gfs2/aops.c
+++ b/fs/gfs2/aops.c
@@ -805,11 +805,16 @@ int gfs2_releasepage(struct page *page, gfp_t gfp_mask)
bd = bh->b_private;
if (bd) {
gfs2_assert_warn(sdp, bd->bd_bh == bh);
- if (!list_empty(&bd->bd_list))
- list_del_init(&bd->bd_list);
bd->bd_bh = NULL;
bh->b_private = NULL;
- kmem_cache_free(gfs2_bufdata_cachep, bd);
+ /*
+ * The bd may still be queued as a revoke, in which
+ * case we must not dequeue nor free it.
+ */
+ if (!bd->bd_blkno && !list_empty(&bd->bd_list))
+ list_del_init(&bd->bd_list);
+ if (list_empty(&bd->bd_list))
+ kmem_cache_free(gfs2_bufdata_cachep, bd);
}
bh = bh->b_this_page;