1.2 文件目录结构

nn文件夹下的内容有（之所以从nn文件夹而不是current文件夹下开始是因为要讲解和current同级的in_user.lock文件）：

nn
├── current
│ ├── edits_0000000001362702459-0000000001363401818
│ ├── edits_0000000001363401819-0000000001363931603
│ ├── edits_0000000001363931604-0000000001364566627
│ ├── edits_0000000001364566628-0000000001365069009
│ ├── edits_0000000001365069010-0000000001365209404
│ ├── edits_0000000001365209405-0000000001365211445
│ ├── edits_0000000001365211446-0000000001365211447
│ ├── edits_0000000001365211448-0000000001365211451
│ ├── edits_0000000001365211452-0000000001365211453
│ ├── edits_0000000001365211454-0000000001365211625
│ ├── edits_0000000001365211626-0000000001365213635
│ ├── edits_inprogress_0000000001365213636
│ ├── fsimage_0000000001365431029
│ ├── fsimage_0000000001365431029.md5
│ ├── fsimage_0000000001365431090
│ ├── fsimage_0000000001365431090.md5
│ ├── seen_txid
│ └── VERSION
└── in_use.lock