From: Darrick J. Wong Date: Wed, 9 Nov 2016 22:13:11 +0000 (-0800) Subject: ocfs2: budget for extent tree splits when adding refcount flag X-Git-Tag: v4.14-rc1~1828^2~1^2~5 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=3e10b793fc40dfdbe51762e0d084bd6f2c8acaaa;p=platform%2Fkernel%2Flinux-rpi.git ocfs2: budget for extent tree splits when adding refcount flag When we're adding the refcount flag to an extent, we have to budget enough space to handle a full extent btree split in addition to whatever modifications have to be made to the refcount btree. We don't currently do this, with the result that generic/186 crashes when we need an extent split but not a refcount split because meta_ac never gets allocated. Signed-off-by: Darrick J. Wong --- diff --git a/fs/ocfs2/refcounttree.c b/fs/ocfs2/refcounttree.c index 3410eb1..6c98d56 100644 --- a/fs/ocfs2/refcounttree.c +++ b/fs/ocfs2/refcounttree.c @@ -3692,6 +3692,9 @@ int ocfs2_add_refcount_flag(struct inode *inode, struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); struct ocfs2_alloc_context *meta_ac = NULL; + /* We need to be able to handle at least an extent tree split. */ + ref_blocks = ocfs2_extend_meta_needed(data_et->et_root_el); + ret = ocfs2_calc_refcount_meta_credits(inode->i_sb, ref_ci, ref_root_bh, p_cluster, num_clusters,