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-rw-r--r--fs/ocfs2/suballoc.c48
1 files changed, 48 insertions, 0 deletions
diff --git a/fs/ocfs2/suballoc.c b/fs/ocfs2/suballoc.c
index 602c05e..c9661c4 100644
--- a/fs/ocfs2/suballoc.c
+++ b/fs/ocfs2/suballoc.c
@@ -1579,6 +1579,48 @@ out:
return ret;
}
+static int ocfs2_bg_discontig_trim_by_rec(struct ocfs2_suballoc_result *res,
+ struct ocfs2_extent_rec *rec,
+ struct ocfs2_chain_list *cl)
+{
+ unsigned int bpc = le16_to_cpu(cl->cl_bpc);
+ unsigned int bitoff = le32_to_cpu(rec->e_cpos) * bpc;
+ unsigned int bitcount = le32_to_cpu(rec->e_leaf_clusters) * bpc;
+
+ if (res->sr_bit_offset < bitoff)
+ return 0;
+ if (res->sr_bit_offset >= (bitoff + bitcount))
+ return 0;
+ if ((res->sr_bit_offset + res->sr_bits) > (bitoff + bitcount))
+ res->sr_bits = (bitoff + bitcount) - res->sr_bit_offset;
+ return 1;
+}
+
+static void ocfs2_bg_discontig_trim_result(struct ocfs2_alloc_context *ac,
+ struct ocfs2_group_desc *bg,
+ struct ocfs2_suballoc_result *res)
+{
+ int i;
+ struct ocfs2_extent_rec *rec;
+ struct ocfs2_dinode *di = (struct ocfs2_dinode *)ac->ac_bh->b_data;
+ struct ocfs2_chain_list *cl = &di->id2.i_chain;
+
+ if (!ocfs2_supports_discontig_bh(OCFS2_SB(ac->ac_inode->i_sb)))
+ return;
+
+ if (ocfs2_is_cluster_bitmap(ac->ac_inode))
+ return;
+
+ if (!bg->bg_list.l_next_free_rec)
+ return;
+
+ for (i = 0; i < le16_to_cpu(bg->bg_list.l_next_free_rec); i++) {
+ rec = &bg->bg_list.l_recs[i];
+ if (ocfs2_bg_discontig_trim_by_rec(res, rec, cl))
+ break;
+ }
+}
+
static int ocfs2_search_one_group(struct ocfs2_alloc_context *ac,
handle_t *handle,
u32 bits_wanted,
@@ -1608,6 +1650,9 @@ static int ocfs2_search_one_group(struct ocfs2_alloc_context *ac,
goto out;
}
+ if (!ret)
+ ocfs2_bg_discontig_trim_result(ac, gd, res);
+
ret = ocfs2_alloc_dinode_update_counts(alloc_inode, handle, ac->ac_bh,
res->sr_bits,
le16_to_cpu(gd->bg_chain));
@@ -1697,6 +1742,9 @@ static int ocfs2_search_chain(struct ocfs2_alloc_context *ac,
res->sr_bg_blkno = le64_to_cpu(bg->bg_blkno);
BUG_ON(res->sr_bits == 0);
+ if (!status)
+ ocfs2_bg_discontig_trim_result(ac, bg, res);
+
/*
* Keep track of previous block descriptor read. When