[PATCH v5 7/9] btrfs: start transaction in btrfs_xattr_handler_set

[Anand Jain <anand.jain@oracle.com>]

Generic extended attributes on the inode are set using
btrfs_xattr_handler_set(), and the required transaction for this update
is started by btrfs_setxattr(). For better granulation of the
transaction start and end, do this in btrfs_xattr_handler_set().
For which this patch copied code of btrfs_setxattr() as it is in the
original, which needs a fix later.

Suggested-by: David Sterba <dsterba@suse.com>
Signed-off-by: Anand Jain <anand.jain@oracle.com>
---
v5: Use BUG_ON instead of ASSERT. Changelog update.
v4: born
 fs/btrfs/xattr.c | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/fs/btrfs/xattr.c b/fs/btrfs/xattr.c
index 69126d5b4d62..e96b0096eaca 100644
--- a/fs/btrfs/xattr.c
+++ b/fs/btrfs/xattr.c
@@ -369,8 +369,29 @@ static int btrfs_xattr_handler_set(const struct xattr_handler *handler,
 				   const char *name, const void *buffer,
 				   size_t size, int flags)
 {
+	int ret;
+	struct btrfs_trans_handle *trans;
+	struct btrfs_root *root = BTRFS_I(inode)->root;
+
 	name = xattr_full_name(handler, name);
-	return btrfs_setxattr(NULL, inode, name, buffer, size, flags);
+
+	trans = btrfs_start_transaction(root, 2);
+	if (IS_ERR(trans))
+		return PTR_ERR(trans);
+
+	ret = btrfs_setxattr(trans, inode, name, buffer, size, flags);
+
+	if (!ret) {
+		inode_inc_iversion(inode);
+		inode->i_ctime = current_time(inode);
+		set_bit(BTRFS_INODE_COPY_EVERYTHING, &BTRFS_I(inode)->runtime_flags);
+		ret = btrfs_update_inode(trans, root, inode);
+		BUG_ON(ret);
+	}
+
+	btrfs_end_transaction(trans);
+
+	return ret;
 }
 
 static int btrfs_xattr_handler_set_prop(const struct xattr_handler *handler,
-- 
1.8.3.1