[PATCH 2/2] Btrfs-progs: mkfs: make sure we can deal with hard links with -r option

[Wang Shilong]

Steps to reproduce:
 # mkdir -p /tmp/test
 # touch /tmp/test/file
 # ln /tmp/test/file /tmp/test/hardlinks
 # mkfs.btrfs -f /dev/sda13 -r /tmp/test
 # btrfs check /dev/sda13

To deal with hard link, we must deal with inode with same inode id rather
than increase inode id by ourselves.

Signed-off-by: Wang Shilong <wangsl.f...@cn.fujitsu.com>
---
 mkfs.c | 21 +++++++++------------
 1 file changed, 9 insertions(+), 12 deletions(-)

diff --git a/mkfs.c b/mkfs.c
index 2f7dfef..b9385bc 100644
--- a/mkfs.c
+++ b/mkfs.c
@@ -380,7 +380,10 @@ static int add_directory_items(struct btrfs_trans_handle 
*trans,
        ret = btrfs_insert_dir_item(trans, root, name, name_len,
                                    parent_inum, &location,
                                    filetype, index_cnt);
-
+       if (ret)
+               return ret;
+       ret = btrfs_insert_inode_ref(trans, root, name, name_len,
+                                    objectid, parent_inum, index_cnt);
        *dir_index_cnt = index_cnt;
        index_cnt++;
 
@@ -493,9 +496,7 @@ static int add_inode_items(struct btrfs_trans_handle *trans,
        struct btrfs_inode_item btrfs_inode;
        u64 objectid;
        u64 inode_size = 0;
-       int name_len;
 
-       name_len = strlen(name);
        fill_inode_item(trans, root, &btrfs_inode, st);
        objectid = self_objectid;
 
@@ -509,16 +510,8 @@ static int add_inode_items(struct btrfs_trans_handle 
*trans,
        btrfs_set_key_type(&inode_key, BTRFS_INODE_ITEM_KEY);
 
        ret = btrfs_insert_inode(trans, root, objectid, &btrfs_inode);
-       if (ret)
-               goto fail;
-
-       ret = btrfs_insert_inode_ref(trans, root, name, name_len,
-                                    objectid, parent_inum, dir_index_cnt);
-       if (ret)
-               goto fail;
 
        *inode_ret = btrfs_inode;
-fail:
        return ret;
 }
 
@@ -826,7 +819,7 @@ static int traverse_directory(struct btrfs_trans_handle 
*trans,
                                goto fail;
                        }
 
-                       cur_inum = ++highest_inum + BTRFS_FIRST_FREE_OBJECTID;
+                       cur_inum = st.st_ino;
                        ret = add_directory_items(trans, root,
                                                  cur_inum, parent_inum,
                                                  cur_file->d_name,
@@ -840,6 +833,10 @@ static int traverse_directory(struct btrfs_trans_handle 
*trans,
                                              cur_file->d_name, cur_inum,
                                              parent_inum, dir_index_cnt,
                                              &cur_inode);
+                       if (ret == -EEXIST) {
+                               BUG_ON(st.st_nlink <= 1);
+                               continue;
+                       }
                        if (ret) {
                                fprintf(stderr, "add_inode_items failed\n");
                                goto fail;
-- 
1.9.0

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