jffs2

  JFFS2 檔案系統及新特性介紹

JFFS2 是一個開放源碼的項目( www.infradead.org)。它是在閃存上使用非常廣泛的讀/寫檔案系統，在嵌入式系統中被普遍的應用。這篇文章首先分析了在閃存上使用 JFFS2 的必要性，然後詳細的闡述了 JFFS2 實作的内部機制，包括日志結構的檔案系統，關鍵的資料結構，挂載過程和垃圾收集機制。同時也指出了 JFFS2 的局限性，并介紹了最新的針對 JFFS2 的不足進行改進的更新檔程式。最後對 JFFS3 的設計思想和現在的開發狀況給予了簡單的介紹。

1． 為什麼需要 JFFS2

這一小節首先介紹了閃存相對于磁盤媒體的特别之處，然後分析了将磁盤檔案系統運作在閃存上的不足，同時也給出了我們使用 JFFS2 的理由。

1.1 閃存(Flash Memory) 的特性和限制

這裡所介紹的閃存的特性和限制都是從上層的檔案系統的角度來看的，而不會涉及到具體的實體特性。總的來說，有兩種類型的 flash memory: NOR flash 和 NAND flash. 先介紹一下這兩種閃存所具有的共同特性。

A) 閃存的最小尋址機關是位元組(byte)，而不是磁盤上的扇區(sector)。這意味着我們可以從一塊閃存的任意偏移(offset)讀資料，但并不表明對閃存寫操作也是以位元組為機關進行的。我們會在下面的闡述中找到答案。

B) 當一塊閃存處在幹淨的狀态時（被擦寫過，但是還沒有寫操作發生），在這塊flash上的每一位(bit)都是邏輯1。

C) 閃存上的每一位(bit)可以被寫操作置成邏輯0。 可是把邏輯 0 置成邏輯 1 卻不能按位(bit)來操作，而隻能按擦寫塊（erase block）為機關進行擦寫操作。擦寫塊的大小從 4K 到128K 不等。從上層來看，擦寫所完成的功能就是把擦寫塊内的每一位都重設定（reset）成邏輯 1。

D) 閃存的使用壽命是有限的。具體來說，閃存的使用壽命是由擦寫塊的最大可擦寫次數來決定的。超過了最大可擦寫次數，這個擦寫塊就成為壞塊(bad block)了。是以為了避免某個擦寫塊被過度擦寫，以至于它先于其他的擦寫塊達到最大可擦寫次數，我們應該在盡量小的影響性能的前提下，使擦寫操作均勻的分布在每個擦寫塊上。這個過程叫做磨損平衡（wear leveling）。

NOR flash 與 NAND flash 的不同之處：

A) NOR flash 讀/寫操作的基本機關是位元組；而 NAND flash 又把擦寫塊分成頁(page), 頁是寫操作的基本機關，一般一個頁的大小是 512 或 2K 個位元組。對于一個頁的重複寫操作次數是有限制的，不同廠商生産的 NAND flash 有不同的限制，有些是一次，有些是四次，六次或十次。

B) 按照現在的技術水準，一般來說NOR flash擦寫塊的最大可擦寫次數在十萬次左右，NAND flash擦寫塊的最大可擦寫次數在百萬次左右。

1.2 閃存轉換層

将磁盤檔案系統(ext2, FAT)運作在閃存上的很自然的方法就是在檔案系統和閃存之間提供一個閃存轉換層(Flash Translation Layer), 它的功能就是将底層的閃存模拟成一個具有 512位元組扇區大小的标準塊裝置(block device)。對于檔案系統來說，就像工作在一個普通的塊裝置上一樣，沒有任何的差别。

圖一

一個閃存轉換層的最簡單的實作就是将模拟的塊裝置一對一的映射到閃存上。舉例來說，當上層的檔案系統要寫一個塊裝置的扇區時，閃存轉換層要做下面的操作來完成這個寫請求：

1 将這個扇區所在擦寫塊地資料讀到記憶體中，放在緩存(buffer)中

2 将緩存中與這個扇區對應的内容用新的内容替換掉

3 對該擦寫塊執行擦寫操作

4 将緩沖中的資料寫回該擦寫塊

這種實作方式的缺點是很明顯的：

1 效率低，對一個扇區的更新要重寫整個擦寫塊上的資料，造成資料帶寬很大的浪費。

2 沒有提供磨損平衡，那些被頻繁更新的資料所在擦寫塊将首先變成壞塊。

3 非常不安全，很容易引起資料的丢失。如果在上面的第三步和第四步之間發生了突然掉電(power loss)，那麼整個擦寫塊中的資料就全部丢失了。這在突然掉電經常發生的嵌入式系統中是不能接受的。

MTD 中的核心子產品 mtdblock 就是基于這種機制實作的，同時還作了一些優化。隻有當檔案系統的寫請求超過了一個擦寫塊的邊界的時候，它才會執行對閃存的擦寫，寫回操作。

是以，為了解決上面這種實作方式的問題，閃存轉換層需要做更多的事情。閃存轉換層不能隻實作這種一對一的映射，而需要将模拟塊裝置的扇區存儲在閃存的不同位置，并且維持扇區到閃存的映射關系。更進一步，閃存轉換層還必須能了解上層檔案系統的語義，否則閃存轉換層沒辦法做垃圾回收(Garbage Collection)。這樣實作最大的問題就是效率不高，具體來說，閃存轉換層為了能了解上層檔案系統的語義，必須對檔案系統的每個寫請求進行解析，這勢必帶來寫操作性能的下降。另外要求檔案系統下面的一層去了解檔案系統的語義，很顯然這不是最好的解決方式。我們還有很好的解決問題的方法，就是實作一個特别針對閃存的檔案系統。而 JFFS2 就是一個這樣的檔案系統。

回頁首

2. JFFS2

有 JFFS2 就要有 JFFS v1，沒錯，JFFS v1 最初是由瑞典的 Axis Communications AB 公司開發的，使用在他們的嵌入式裝置中，并且在 1999 年末基于 GNU GPL 釋出出來。最初的釋出版本基于 Linux 核心 2.0，後來 RedHat 将它移植到 Linux 核心 2.2，做了大量的測試和 bug fix 的工作使它穩定下來，并且對簽約客戶提供商業支援。但是在使用的過程中，JFFS v1 設計中的局限被不斷的暴露出來。于是在 2001 年初的時候，RedHat 決定實作一個新的閃存檔案系統，這就是現在的 JFFS2。下面将詳細介紹 JFFS2 設計中主要的思想，關鍵的資料結構和垃圾收集機制。這将為我們實作一個閃存上的檔案系統提供很好的啟示。首先，JFFS2 是一個日志結構(log-structured)的檔案系統，包含資料和原資料(meta-data)的節點在閃存上順序的存儲。JFFS2 之是以選擇日志結構的存儲方式，是因為對閃存的更新應該是 out-of-place 的更新方式，而不是對磁盤的 in-place 的更新方式。在閃存上 in-place 更新方式的問題我們已經在閃存轉換層一節描述過了。

2.1 節點頭部定義和相容性

JFFS2 将檔案系統的資料和原資料以節點的形式存儲在閃存上，具體來說節點頭部的定義如下：

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http://www.songtaste.com/user/9212950/info

圖二

幻數屏蔽位：0x1985 用來辨別 JFFS2 檔案系統。

節點類型：JFFS2 自身定義了三種節點類型，但是考慮到檔案系統可擴充性和相容性，JFFS2從 ext2 借鑒了經驗，節點類型的最高兩位被用來定義節點的相容屬性，具體來說有下面幾種相容屬性：

JFFS2_FEATURE_INCOMPAT：當 JFFS2 發現了一個不能識别的節點類型，并且它的相容屬性是 JFFS2_FEATURE_INCOMPAT，那麼 JFFS2 必須拒絕挂載(mount)檔案系統。

JFFS2_FEATURE_ROCOMPAT：當 JFFS2 發現了一個不能識别的節點類型，并且它的相容屬性是 JFFS2_FEATURE_ROCOMPAT，那麼 JFFS2 必須以隻讀的方式挂載檔案系統。

JFFS2_FEATURE_RWCOMPAT_DELETE：當 JFFS2 發現了一個不能識别的節點類型，并且它的相容屬性是 JFFS2_FEATURE_RWCOMPAT_DELETE，那麼在垃圾回收的時候，這個節點可以被删除。

JFFS2_FEATURE_RWCOMPAT_COPY：當 JFFS2 發現了一個不能識别的節點類型，并且它的相容屬性是 JFFS2_FEATURE_RWCOMPAT_COPY，那麼在垃圾回收的時候，這個節點要被拷貝到新的位置。

節點總長度：包括節點頭和資料的長度。

節點頭部 CRC 校驗：包含節點頭部的校驗碼，為檔案系統的可靠性提供了支援。

2.2 節點類型

JFFS2 定義了三種節點類型：

JFFS2_NODETYPE_INODE： INODE 節點包含了i-節點的原資料(i節點号，檔案的組 ID, 屬主 id, 通路時間，偏移，長度等)，檔案資料被附在 INODE 節點之後。除此之外，每個 INODE 節點還有一個版本号，它被用來維護屬于一個i-節點的所有 INODE 節點的全序關系。下面舉例來說明這個全序關系在 JFFS2 的使用：

圖三

是以，當檔案系統從閃存上讀節點資訊後，會生成下面的映射資訊：

圖四

根據這個映射資訊表，檔案系統就知道到相應的 INODE 節點去讀取相應的檔案内容。最後要說明的是，JFFS2 支援檔案資料的壓縮存儲，是以在 INODE 節點中還包含了所使用的壓縮算法，在讀取資料的時候選擇相應的壓縮算法來解壓縮。

JFFS2_NODETYPE_DIRENT： DIRENT 節點就是把檔案名與 i 節點對應起來。在 DIRENT節點中也有一個版本号，這個版本号的作用主要是用來删除一個 dentry。具體來說，當我們要從一個目錄中删除一個 dentry 時，我們要寫一個 DIRENT 節點，節點中的檔案名與被删除的 dentry 中的檔案名相同，i 節點号置為 0，同時設定一個更高的版本号。

JFFS2_NODETYPE_CLEANMARKER：當一個擦寫塊被擦寫完畢後，CLEANMARKER 節點會被寫在 NOR flash 的開頭，或 NAND flash 的 OOB(Out-Of-Band) 區域來表明這是一個幹淨，可寫的擦寫塊。在 JFFS v1 中，如果掃描到開頭的 1K 都是 0xFF 就認為這個擦寫塊是幹淨的。但是在實際的測試中發現，如果在擦寫的過程中突然掉電，擦寫塊上也可能會有大塊連續 0xFF，但是這并不表明這個擦寫塊是幹淨的。于是我們需要 CLEANMARKER 節點來确切的辨別一個幹淨的擦寫塊。

2.3 JFFS2節點，擦寫塊在記憶體中的表示和操作

JFFS2 維護了幾個連結清單來管理擦寫塊，根據擦寫塊上的内容，一個擦寫塊會在不同的連結清單上。具體來說，當一個擦寫塊上都是合法(valid)的節點時，它會在 clean_list 上；當一個擦寫塊包含至少一個過時(obsolete)的節點時，它會在 dirty_list 上；當一個擦寫塊被擦寫完畢，并被寫入 CLEANMARKER 節點後，它會在 free_list 上。

通常情況下，JFFS2 順序的在擦寫塊上寫入不同的節點，直到一個擦寫塊被寫滿。此時 JFFS2 從 free_list 上取下一個擦寫塊，繼續從擦寫塊的開頭開始寫入節點。當 free_list 上擦寫塊的數量逐漸減少到一個預先設定的閥值的時候，垃圾回收就被觸發了，為檔案系統清理出更多的可用擦寫塊。為了減少對記憶體的占用，JFFS2 并沒有把 i 節點所有的資訊都保留在記憶體中，而隻是把那些在請求到來時不能很快獲得的資訊保留在記憶體中。具體來說，對于在閃存上的每個 i 節點，在記憶體裡都有一個 struct jffs2_inode_cache 與之對應，這個結構裡儲存了 i 節點号，指向 i 節點的連接配接數，以及一個指向屬于這個 i 節點的實體節點連結清單的指針。所有的 struct jffs2_inode_cache 存儲在一個哈希表中。閃存上的每個節點在記憶體中由一個 struct jffs2_raw_node_ref 表示，這個結構裡儲存了此節點的實體偏移，總長度，以及兩個指向 struct jffs2_raw_node_ref 的指針。一個指針指向此節點在實體擦寫塊上的下一個節點，另一個指針指向屬于同一個 i-節點的實體節點連結清單的下一個節點。

圖五

在閃存上的節點的起始偏移都是 4 位元組對齊的，是以 struct jffs2_inode_cache 中flash_offset 的最低兩位沒有被用到。JFFS2 正好利用最低位作為此節點是否過時的标記。

下面舉一例來說明 JFFS2 是如何使用這些資料結構的。VFS 調用 iget() 來得到一個 i 節點的資訊，當這個 i 節點不在緩存中的時候，VFS 就會調用 JFFS2 的 read_inode() 回調函數來得到 i 節點資訊。傳給 read_inode() 的參數是 i 節點号，JFFS2 用這個 i 節點号從哈希表中查找相應的 struct jffs2_inode_cache，然後利用屬于這個 i 節點的節點連結清單從閃存上讀入節點資訊，建立類似于表三的映射資訊。

2.4 JFFS2 挂載過程

JFFS2 的挂載過程分為四個階段：

1) JFFS2 掃描閃存媒體，檢查每個節點 CRC 校驗碼的合法性，同時配置設定了 struct jffs2_inode_cache 和 struct jffs2_raw_node_ref

2) 掃描每個 i 節點的實體節點連結清單，辨別出過時的實體節點；對每一個合法的 dentry 節點，将相應的 jffs2_inode_cache 中的 nlink 加一。

3 找出 nlink 為 0 的 jffs2_inode_cache，釋放相應的節點。

4 釋放在掃描過程中使用的臨時資訊。

2.5 JFFS2 垃圾回收機制

當 free_list 上的擦寫塊數太少了，垃圾回收就會被觸發。垃圾回收主要的任務就是回收那些已經過時的節點，但是除此之外它還要考慮磨損平衡的問題。因為如果一味的從 dirty_list上選取擦寫塊進行垃圾回收，那麼 dirty_list 上的擦寫塊将先于 clean_list 上的擦寫塊被磨損壞。JFFS2 的處理方式是以 99% 的機率從 dirty_list，1% 的機率從 clean_list 上取一個擦寫塊下來。由此可以看出 JFFS2 的設計思想是偏向于性能，同時兼顧磨損平衡。對這個塊上每一個沒有過時的節點執行相同的操作：

1 找出這個節點所屬的 i 節點号(見圖五)。

2 調用 iget()，建立這個 i 節點的檔案映射表。

3 找出這個節點上沒有過時的資料内容，并且如果合法的資料太少，JFFS2 還會合并相鄰的節點。

4 将資料讀入倒緩存裡，然後将它拷貝到新的擦寫塊上。

5 将回收的節點置為過時。

當擦寫塊上所有的節點都被置為過時，就可以擦寫這個擦寫塊，回收使用它。

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3. JFFS2 的不足之處

3.1 挂載時間過長

JFFS2 的挂載過程需要對閃存從頭到尾的掃描，這個過程是很慢的，我們在測試中發現，挂載一個 16M 的閃存有時需要半分鐘以上的時間。

3.2 磨損平衡的随意性(random nature)

JFFS2 對磨損平衡是用機率的方法來解決的，這很難保證磨損平衡的确定性。在某些情況下，可能造成對擦寫塊不必要的擦寫操作；在某些情況下，又會引起對磨損平衡調整的不及時。

3.3 很差的擴充性

JFFS2 中有兩個地方的處理是 O(N) 的，這使得它的擴充性很差。

首先，挂載時間同閃存的大小，閃存上節點數目成正比。

其次，雖然 JFFS2 盡可能的減少記憶體的占用，但通過上面對 JFFS2 的介紹我們可以知道實際上它對記憶體的占用量是同 i 節點數和閃存上的節點數成正比的。

是以在實際應用中，JFFS2 最大能用在 128M 的閃存上。

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4. JFFS2 的新特性

最近加入到 JFFS2 中的兩個更新檔程式分别解決了上面提到的挂載時間過長和磨損平衡随意性的問題。

4.1 磨損塊小結更新檔程式(erase block summary patch)

這個更新檔程式最基本的思想就是用空間來換時間。具體來說，就是将每個擦寫塊每個節點的原資料資訊寫在這個擦寫塊的最後，當 JFFS2 挂載的時候，對每個擦寫塊隻需要讀一次來讀取這個小結節點，是以大大減少了挂載時間。使用了磨損塊小結更新檔程式，一個擦寫塊的結構就像下面這樣：

圖六

根據我們的測試，使用磨損塊小結更新檔程式，挂載一個 12M 的閃存需要 2~3 秒，挂載一個 16M 的閃存需要 3~4 秒。

4.2 改進的磨損平衡更新檔程式

這個更新檔程式的基本思想是，記錄每個擦寫塊的擦寫次數，當閃存上各個擦寫塊的擦寫次數的差距超過某個預定的閥值，開始進行磨損平衡的調整。調整的政策是，在垃圾回收時将擦寫次數小的擦寫塊上的資料遷移到擦寫次數大的擦寫塊上。這樣一來我們提高了磨損平衡的确定性，我們可以知道什麼時候開始磨損平衡的調整，也可以知道選取哪些擦寫塊進行磨損平衡的調整。

4.3 擦寫塊頭部更新檔程式

在寫改進的磨損平衡更新檔程式的過程之中，我們需要記錄每個擦寫塊的擦寫次數，這個資訊需要記錄在各自的擦寫塊上。可是我們發現 JFFS2 中缺少一種靈活的對每個擦寫塊的資訊進行擴充的機制。于是我們為每個擦寫塊引入了擦寫塊頭部(header)，這個頭部負責紀錄每個擦寫塊的資訊(比如說擦寫次數)，并且它提供了靈活的擴充機制，将來如果有新的資訊需要記錄，可以很容易的加入到頭部之中。

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5. JFFS3 簡介

雖然不斷有新的更新檔程式來提高 JFFS2 的性能，但是不可擴充性是它最大的問題，但是這是它自身設計的先天缺陷，是沒有辦法靠後天來彌補的。是以我們需要一個全新的檔案系統，而 JFFS3 就是這樣的一個檔案系統，JFFS3 的設計目标是支援大容量閃存(>1TB)的檔案系統。JFFS3 與 JFFS2 在設計上根本的差別在于，JFFS3 将索引資訊存放在閃存上，而 JFFS2将索引資訊儲存在記憶體中。比如說，由給定的檔案内的偏移定位到存儲媒體上的實體偏移位址所需的資訊，查找某個目錄下所有的目錄項所需的資訊都是索引資訊的一種。 JFFS3 現在還處于設計階段，檔案系統的基本結構借鑒了 Reiser4 的設計思想，整個檔案系統就是一個 B+ 樹。JFFS3 的發起者正工作于垃圾回收機制的設計，這是 JFFS3 中最複雜，也是最富有挑戰性的部分。JFFS3 的設計文檔可以在http://www.linux-mtd.infradead.org/doc/jffs3.html 得到，有興趣的讀者可以積極參與到 JFFS3 的設計中，發表自己的見解，參與讨論。