[PATCH 14/30] ocfs2: abstract the chain list dinode guard and count check

[Joseph Qi <joseph.qi@linux.alibaba.com>]

Introduce ocfs2_dinode_has_chain_list() for the OCFS2_CHAIN_FL test that
selects the id2.i_chain union arm, and ocfs2_dinode_has_bad_chain_count()
for the cl_count against ocfs2_chain_recs_per_inode() test.

This mirrors the guard predicates already used for the inline-data and
fast symlink groups, and ocfs2_dinode_has_extents() for the extent list
group.

No functional change intended.

Signed-off-by: Joseph Qi <joseph.qi@linux.alibaba.com>
---
 fs/ocfs2/inode.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/fs/ocfs2/inode.c b/fs/ocfs2/inode.c
index 9cf2541b82ba..f3ee6491c141 100644
--- a/fs/ocfs2/inode.c
+++ b/fs/ocfs2/inode.c
@@ -216,6 +216,18 @@ static bool ocfs2_dinode_has_unterminated_fast_symlink(struct super_block *sb,
 	return strnlen((char *)di->id2.i_symlink, i_size + 1) != i_size;
 }
 
+static bool ocfs2_dinode_has_chain_list(struct ocfs2_dinode *di)
+{
+	return le32_to_cpu(di->i_flags) & OCFS2_CHAIN_FL;
+}
+
+static bool ocfs2_dinode_has_bad_chain_count(struct super_block *sb,
+					     struct ocfs2_dinode *di)
+{
+	return le16_to_cpu(di->id2.i_chain.cl_count) !=
+		ocfs2_chain_recs_per_inode(sb);
+}
+
 void ocfs2_set_inode_flags(struct inode *inode)
 {
 	unsigned int flags = OCFS2_I(inode)->ip_attr;
@@ -1829,12 +1841,12 @@ int ocfs2_validate_inode_block(struct super_block *sb,
 		}
 	}
 
-	if (le32_to_cpu(di->i_flags) & OCFS2_CHAIN_FL) {
+	if (ocfs2_dinode_has_chain_list(di)) {
 		struct ocfs2_chain_list *cl = &di->id2.i_chain;
 		u16 bpc = 1 << (OCFS2_SB(sb)->s_clustersize_bits -
 				sb->s_blocksize_bits);
 
-		if (le16_to_cpu(cl->cl_count) != ocfs2_chain_recs_per_inode(sb)) {
+		if (ocfs2_dinode_has_bad_chain_count(sb, di)) {
 			rc = ocfs2_error(sb, "Invalid dinode %llu: chain list count %u\n",
 					 (unsigned long long)bh->b_blocknr,
 					 le16_to_cpu(cl->cl_count));
-- 
2.39.3