Ocfs2/refcounttree: Fix a bug for refcounttree to writeback clusters in a right number.

Current refcounttree codes actually didn't writeback the new pages out in
write-back mode, due to a bug of always passing a ZERO number of clusters
to 'ocfs2_cow_sync_writeback', the patch tries to pass a proper one in.

Signed-off-by: Tristan Ye <tristan.ye@oracle.com>
Cc: stable@kernel.org
Signed-off-by: Joel Becker <jlbec@evilplan.org>

diff --git a/fs/ocfs2/refcounttree.c b/fs/ocfs2/refcounttree.c
index b5f9160e93e9119b949451bb3e5db66b3c1df62c..19ebc5aad391f73d58b22b0583114bf7d0517eb8 100644 (file)
--- a/fs/ocfs2/refcounttree.c
+++ b/fs/ocfs2/refcounttree.c
@@ -3228,7 +3228,7 @@ static int ocfs2_make_clusters_writable(struct super_block *sb,
                                        u32 num_clusters, unsigned int e_flags)
 {
        int ret, delete, index, credits =  0;
-       u32 new_bit, new_len;
+       u32 new_bit, new_len, orig_num_clusters;
        unsigned int set_len;
        struct ocfs2_super *osb = OCFS2_SB(sb);
        handle_t *handle;
@@ -3261,6 +3261,8 @@ static int ocfs2_make_clusters_writable(struct super_block *sb,
                goto out;
        }
 
+       orig_num_clusters = num_clusters;
+
        while (num_clusters) {
                ret = ocfs2_get_refcount_rec(ref_ci, context->ref_root_bh,
                                             p_cluster, num_clusters,
@@ -3348,7 +3350,8 @@ static int ocfs2_make_clusters_writable(struct super_block *sb,
         * in write-back mode.
         */
        if (context->get_clusters == ocfs2_di_get_clusters) {
-               ret = ocfs2_cow_sync_writeback(sb, context, cpos, num_clusters);
+               ret = ocfs2_cow_sync_writeback(sb, context, cpos,
+                                              orig_num_clusters);
                if (ret)
                        mlog_errno(ret);
        }