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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 <darrick.wong@oracle.com>
This commit is contained in:
Darrick J. Wong 2016-11-09 14:13:11 -08:00
parent 06a7030581
commit 3e10b793fc
1 changed files with 3 additions and 0 deletions
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3
fs/ocfs2/refcounttree.c
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@ -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,