From 2f48d593b6ceb7bb63d34124ceba77d33be298cf Mon Sep 17 00:00:00 2001
From: Tao Ma
Date: Thu, 15 Oct 2009 11:10:49 +0800
Subject: ocfs2: duplicate inline data properly during reflink.

The old reflink fails to handle inodes with inline data and will oops
if it encounters them.  This patch copies inline data to the new inode.
Extended attributes may still be refcounted.

Signed-off-by: Tao Ma <tao.ma@oracle.com>
Signed-off-by: Joel Becker <joel.becker@oracle.com>
Tested-by: Tristan Ye <tristan.ye@oracle.com>
---
 fs/ocfs2/file.c         |  3 ++-
 fs/ocfs2/refcounttree.c | 55 +++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 57 insertions(+), 1 deletion(-)

(limited to 'fs')

diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index 89fc8ee1f5a5..de059f490586 100644
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -1712,7 +1712,8 @@ int ocfs2_check_range_for_refcount(struct inode *inode, loff_t pos,
 	struct super_block *sb = inode->i_sb;
 
 	if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb)) ||
-	    !(OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL))
+	    !(OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL) ||
+	    OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
 		return 0;
 
 	cpos = pos >> OCFS2_SB(sb)->s_clustersize_bits;
diff --git a/fs/ocfs2/refcounttree.c b/fs/ocfs2/refcounttree.c
index 9d439b277304..3a0df7a1b810 100644
--- a/fs/ocfs2/refcounttree.c
+++ b/fs/ocfs2/refcounttree.c
@@ -3743,6 +3743,9 @@ static int ocfs2_attach_refcount_tree(struct inode *inode,
 		goto out;
 	}
 
+	if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL)
+		goto attach_xattr;
+
 	ocfs2_init_dinode_extent_tree(&di_et, INODE_CACHE(inode), di_bh);
 
 	size = i_size_read(inode);
@@ -3769,6 +3772,7 @@ static int ocfs2_attach_refcount_tree(struct inode *inode,
 		cpos += num_clusters;
 	}
 
+attach_xattr:
 	if (oi->ip_dyn_features & OCFS2_HAS_XATTR_FL) {
 		ret = ocfs2_xattr_attach_refcount_tree(inode, di_bh,
 						       &ref_tree->rf_ci,
@@ -3858,6 +3862,49 @@ out:
 	return ret;
 }
 
+static int ocfs2_duplicate_inline_data(struct inode *s_inode,
+				       struct buffer_head *s_bh,
+				       struct inode *t_inode,
+				       struct buffer_head *t_bh)
+{
+	int ret;
+	handle_t *handle;
+	struct ocfs2_super *osb = OCFS2_SB(s_inode->i_sb);
+	struct ocfs2_dinode *s_di = (struct ocfs2_dinode *)s_bh->b_data;
+	struct ocfs2_dinode *t_di = (struct ocfs2_dinode *)t_bh->b_data;
+
+	BUG_ON(!(OCFS2_I(s_inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL));
+
+	handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
+	if (IS_ERR(handle)) {
+		ret = PTR_ERR(handle);
+		mlog_errno(ret);
+		goto out;
+	}
+
+	ret = ocfs2_journal_access_di(handle, INODE_CACHE(t_inode), t_bh,
+				      OCFS2_JOURNAL_ACCESS_WRITE);
+	if (ret) {
+		mlog_errno(ret);
+		goto out_commit;
+	}
+
+	t_di->id2.i_data.id_count = s_di->id2.i_data.id_count;
+	memcpy(t_di->id2.i_data.id_data, s_di->id2.i_data.id_data,
+	       le16_to_cpu(s_di->id2.i_data.id_count));
+	spin_lock(&OCFS2_I(t_inode)->ip_lock);
+	OCFS2_I(t_inode)->ip_dyn_features |= OCFS2_INLINE_DATA_FL;
+	t_di->i_dyn_features = cpu_to_le16(OCFS2_I(t_inode)->ip_dyn_features);
+	spin_unlock(&OCFS2_I(t_inode)->ip_lock);
+
+	ocfs2_journal_dirty(handle, t_bh);
+
+out_commit:
+	ocfs2_commit_trans(osb, handle);
+out:
+	return ret;
+}
+
 static int ocfs2_duplicate_extent_list(struct inode *s_inode,
 				struct inode *t_inode,
 				struct buffer_head *t_bh,
@@ -3997,6 +4044,14 @@ static int ocfs2_create_reflink_node(struct inode *s_inode,
 		goto out;
 	}
 
+	if (OCFS2_I(s_inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
+		ret = ocfs2_duplicate_inline_data(s_inode, s_bh,
+						  t_inode, t_bh);
+		if (ret)
+			mlog_errno(ret);
+		goto out;
+	}
+
 	ret = ocfs2_lock_refcount_tree(osb, le64_to_cpu(di->i_refcount_loc),
 				       1, &ref_tree, &ref_root_bh);
 	if (ret) {
-- 
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