[encoded data, 22327 characters]\" width=\"412\" height=\"355\" alt=\"image\" id=\"Object2\" /> <br style=\"clear: left;\" />\n<br />\n<br />\n</p>\n<p>The above directory structure represents the following directory tree</p>\n<table cellpadding=\"4\" style=\"width: 605px; border-spacing: 0px;\">\n<col width=\"119\" /> <col width=\"468\" />\n<tr valign=\"top\">\n <td style=\"border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: none; padding-top: 0.1cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0cm; width: 119px;\">\n <p style=\"orphans: 0; widows: 0; page-break-before: auto\"><span style=\"font-family: Courier, monospace;\"><span style=\"font-size: 12pt; font-size: medium; font-size: medium;\">/</span></span></p>\n  </td>\n <td style=\"border: 1px solid #000000; padding: 0.1cm; width: 468px;\">\n <p style=\"orphans: 0; widows: 0; page-break-before: auto\"><span style=\"font-size: 12pt; font-size: medium; font-size: medium;\">Root directory</span></p>\n  </td>\n</tr>\n<tr valign=\"top\">\n <td style=\"border-top: none; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: none; padding-top: 0cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0cm; width: 119px;\">\n <p style=\"orphans: 0; widows: 0; page-break-before: auto\"><span style=\"font-family: Courier, monospace;\"><span style=\"font-size: 12pt; font-size: medium; font-size: medium;\">/a</span></span></p>\n  </td>\n <td style=\"border-top: none; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000; padding-top: 0cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0.1cm; width: 468px;\">\n <p style=\"orphans: 0; widows: 0; page-break-before: auto\"><span style=\"font-size: 12pt; font-size: medium; font-size: medium;\">Directory containing c,d,e</span></p>\n  </td>\n</tr>\n<tr valign=\"top\">\n <td style=\"border-top: none; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: none; padding-top: 0cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0cm; width: 119px;\">\n <p style=\"orphans: 0; widows: 0; page-break-before: auto\"><span style=\"font-family: Courier, monospace;\"><span style=\"font-size: 12pt; font-size: medium; font-size: medium;\">/b</span></span></p>\n  </td>\n <td style=\"border-top: none; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000; padding-top: 0cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0.1cm; width: 468px;\">\n <p style=\"orphans: 0; widows: 0; page-break-before: auto\"><span style=\"font-size: 12pt; font-size: medium; font-size: medium;\">Empty directory</span></p>\n  </td>\n</tr>\n<tr valign=\"top\">\n <td style=\"border-top: none; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: none; padding-top: 0cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0cm; width: 119px;\">\n <p style=\"orphans: 0; widows: 0; page-break-before: auto\"><span style=\"font-family: Courier, monospace;\"><span style=\"font-size: 12pt; font-size: medium; font-size: medium;\">/lost+found</span></span></p>\n  </td>\n <td style=\"border-top: none; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000; padding-top: 0cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0.1cm; width: 468px;\">\n <p style=\"orphans: 0; widows: 0; page-break-before: auto\"><span style=\"font-size: 12pt; font-size: medium; font-size: medium;\">Empty directory</span></p>\n  </td>\n</tr>\n<tr valign=\"top\">\n <td style=\"border-top: none; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: none; padding-top: 0cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0cm; width: 119px;\">\n <p style=\"orphans: 0; widows: 0; page-break-before: auto\"><span style=\"font-family: Courier, monospace;\"><span style=\"font-size: 12pt; font-size: medium; font-size: medium;\">/a/c</span></span></p>\n  </td>\n <td style=\"border-top: none; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000; padding-top: 0cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0.1cm; width: 468px;\">\n <p style=\"orphans: 0; widows: 0; page-break-before: auto\"><span style=\"font-size: 12pt; font-size: medium; font-size: medium;\">Directory</span></p>\n  </td>\n</tr>\n<tr valign=\"top\">\n <td style=\"border-top: none; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: none; padding-top: 0cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0cm; width: 119px;\">\n <p style=\"orphans: 0; widows: 0; page-break-before: auto\"><span style=\"font-family: Courier, monospace;\"><span style=\"font-size: 12pt; font-size: medium; font-size: medium;\">/a/d</span></span></p>\n  </td>\n <td style=\"border-top: none; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000; padding-top: 0cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0.1cm; width: 468px;\">\n <p style=\"orphans: 0; widows: 0; page-break-before: auto\"><span style=\"font-size: 12pt; font-size: medium; font-size: medium;\">Data file</span></p>\n  </td>\n</tr>\n<tr valign=\"top\">\n <td style=\"border-top: none; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: none; padding-top: 0cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0cm; width: 119px;\">\n <p style=\"orphans: 0; widows: 0; page-break-before: auto\"><span style=\"font-family: Courier, monospace;\"><span style=\"font-size: 12pt; font-size: medium; font-size: medium;\">/a/e</span></span></p>\n  </td>\n <td style=\"border-top: none; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000; padding-top: 0cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0.1cm; width: 468px;\">\n <p style=\"orphans: 0; widows: 0; page-break-before: auto\"><span style=\"font-size: 12pt; font-size: medium; font-size: medium;\">Data file</span></p>\n  </td>\n</tr>\n</table>\n<p style=\"margin-bottom: 0cm; orphans: 0; widows: 0; page-break-before: auto\"><br />\n</p>\n<p>If a Yaffs partition has been somehow corrupted then it is possible for an object to be created during scanning but with no object header (which contains the object name) being found. The object would then not have a name. In these cases, Yaffs creates a pseudonym from the object number of the form objnnnn so that the object can be placed in the directory structure. </p>\n<h2 class=\"western\" style=\"page-break-before: always\">12.4 Hard links</h2>\n<p>In POSIX file systems, the objects (inodes in Linux terminology, vnode in BSD-speak) and the object names (dentry in Linux terminology) are independent in that an object can have zero, one or more names.</p>\n<p>Having files with zero links is caused by constructs such as:</p>\n<p style=\"margin-left: 1.25cm; margin-bottom: 0cm; orphans: 0; widows: 0; page-break-before: auto\"><span style=\"font-family: Courier 10 Pitch;\"><span style=\"font-size: 8pt; font-size: xx-small; font-size: xx-small;\"><code class=\"western\"><span style=\"font-size: 10pt; font-size: small; font-size: small;\">h = open(“foo”,O_CREAT | O_RDWR, S_IREAD | S_IWRITE); /* create file “foo” */</span></code></span></span></p>\n<p style=\"margin-left: 1.25cm; margin-bottom: 0cm; orphans: 0; widows: 0; page-break-before: auto\"><span style=\"font-family: Courier 10 Pitch;\"><span style=\"font-size: 8pt; font-size: xx-small; font-size: xx-small;\"><code class=\"western\"><span style=\"font-size: 10pt; font-size: small; font-size: small;\">unlink(“foo”); /* unlink it </span></code><code class=\"western\"><span style=\"font-size: 10pt; font-size: small; font-size: small;\">to remove</span></code><code class=\"western\"><span style=\"font-size: 10pt; font-size: small; font-size: small;\">directory </span></code><code class=\"western\"><span style=\"font-size: 10pt; font-size: small; font-size: small;\">entry </span></code><code class=\"western\"><span style=\"font-size: 10pt; font-size: small; font-size: small;\">*/</span></code></span></span></p>\n<p style=\"margin-left: 1.25cm; margin-bottom: 0cm; orphans: 0; widows: 0; page-break-before: auto\"><span style=\"font-family: Courier 10 Pitch;\"><span style=\"font-size: 8pt; font-size: xx-small; font-size: xx-small;\"><code class=\"western\"><span style=\"font-size: 10pt; font-size: small; font-size: small;\">/* we still have a handle to the file so can still access it via the handle */</span></code></span></span></p>\n<p style=\"margin-left: 1.25cm; margin-bottom: 0cm; orphans: 0; widows: 0; page-break-before: auto\"><span style=\"font-family: Courier 10 Pitch;\"><span style=\"font-size: 8pt; font-size: xx-small; font-size: xx-small;\"><code class=\"western\"><span style=\"font-size: 10pt; font-size: small; font-size: small;\">read(h,buffer,100); </span></code></span></span></p>\n<p style=\"margin-left: 1.25cm; margin-bottom: 0cm; orphans: 0; widows: 0; page-break-before: auto\"><span style=\"font-family: Courier 10 Pitch;\"><span style=\"font-size: 8pt; font-size: xx-small; font-size: xx-small;\"><code class=\"western\"><span style=\"font-size: 10pt; font-size: small; font-size: small;\">write(h,buffer,100);</span></code></span></span></p>\n<p style=\"margin-left: 1.25cm; margin-bottom: 0cm; orphans: 0; widows: 0; page-break-before: auto\"><span style=\"font-family: Courier 10 Pitch;\"><span style=\"font-size: 8pt; font-size: xx-small; font-size: xx-small;\"><code class=\"western\"><span style=\"font-size: 10pt; font-size: small; font-size: small;\">close(h); /* as soon as the handle is closed the file is deleted */</span></code></span></span></p>\n<p style=\"margin-left: 1.25cm; margin-bottom: 0cm; orphans: 0; widows: 0; page-break-before: auto\"><br />\n</p>\n<p>Yaffs does not store separate object and name records because that would waste space and incur extra reading/writing. Instead, Yaffs is optimised for the most typical case of one name per object. That is, Yaffs stores one name per yaffs_obj and uses “cheats” to achieve other behavior:</p>\n<ul>\n<li>\n<p>Objects that have zero names (ie unlinked objects) are handled by renaming the object into a fake directory that is used to designate unlinked objects.</p>\n </li>\n<li>\n<p>Multiple names object are handled by designating one of the objects the main object and having multiple hard link pseudo-objects that refer to it.</p>\n </li>\n<li>\n<p>The inode number (vnid in BSD-speak) is a per-file system unique number that identifies the object. The Yaffs obj_id of the main object is presented to the user. That is, if the inode number is queried from a hardlink object then the obj_id of the equivalent object is returned.</p>\n </li>\n</ul>\n<p>The linkage between hard link pseudo-objects and their equivalent object is through two fields:</p>\n<ul>\n<li>\n<p>Each object has a hard_links doubly linked list node that links the list of hard links to that object.</p>\n </li>\n<li>\n<p>Each hard link has a equiv_obj pointer to the “equivalent object”.</p>\n </li>\n</ul>\n<p style=\"page-break-before: always\">The usage of this structure is straight forward except for one interesting case when hard links are being deleted. Consider the following sequence of events:</p>\n<table cellpadding=\"4\" style=\"width: 605px; border-spacing: 0px;\">\n<col width=\"50\" /> <col width=\"80\" /> <col width=\"449\" />\n<tr valign=\"top\">\n <td style=\"border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: none; padding-top: 0.1cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0cm; width: 50px;\">\n <p style=\"orphans: 0; widows: 0; page-break-before: auto\"><span style=\"font-size: 12pt; font-size: medium; font-size: medium;\">1</span></p>\n  </td>\n <td style=\"border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: none; padding-top: 0.1cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0cm; width: 80px;\">\n <p style=\"orphans: 0; widows: 0; page-break-before: auto\"><span style=\"font-size: 12pt; font-size: medium; font-size: medium;\"># touch a</span></p>\n  </td>\n <td style=\"border: 1px solid #000000; padding: 0.1cm; width: 449px;\">\n <p style=\"orphans: 0; widows: 0; page-break-before: auto\"><span style=\"font-size: 12pt; font-size: medium; font-size: medium;\">Create file a</span></p>\n  </td>\n</tr>\n<tr valign=\"top\">\n <td style=\"border-top: none; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: none; padding-top: 0cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0cm; width: 50px;\">\n <p style=\"orphans: 0; widows: 0; page-break-before: auto\"><span style=\"font-size: 12pt; font-size: medium; font-size: medium;\">2</span></p>\n  </td>\n <td style=\"border-top: none; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: none; padding-top: 0cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0cm; width: 80px;\">\n <p style=\"orphans: 0; widows: 0; page-break-before: auto\"><span style=\"font-size: 12pt; font-size: medium; font-size: medium;\"># ln a b</span></p>\n  </td>\n <td style=\"border-top: none; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000; padding-top: 0cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0.1cm; width: 449px;\">\n <p style=\"orphans: 0; widows: 0; page-break-before: auto\"><span style=\"font-size: 12pt; font-size: medium; font-size: medium;\">Create a hard link b with equivalent object a.</span></p>\n  </td>\n</tr>\n<tr valign=\"top\">\n <td style=\"border-top: none; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: none; padding-top: 0cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0cm; width: 50px;\">\n <p style=\"orphans: 0; widows: 0; page-break-before: auto\"><span style=\"font-size: 12pt; font-size: medium; font-size: medium;\">3</span></p>\n  </td>\n <td style=\"border-top: none; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: none; padding-top: 0cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0cm; width: 80px;\">\n <p style=\"orphans: 0; widows: 0; page-break-before: auto\"><span style=\"font-size: 12pt; font-size: medium; font-size: medium;\"># rm a</span></p>\n  </td>\n <td style=\"border-top: none; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000; padding-top: 0cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0.1cm; width: 449px;\">\n <p style=\"orphans: 0; widows: 0; page-break-before: auto\"><span style=\"font-size: 12pt; font-size: medium; font-size: medium;\">Remove a. The object must still exist under the name b</span></p>\n  </td>\n</tr>\n</table>\n<p style=\"margin-bottom: 0cm; orphans: 0; widows: 0; page-break-before: auto\"><br />\n</p>\n<p>In step 3, Yaffs cannot just delete the equivalent object since that would leave a “hanging” hard link with no equivalent object. </p>\n<p>We also cannot just change the type of one of the hardlink objects because that would cause the object\'s obj_id to change. This would be unacceptable since it would break any mechanism that use the obj_id (of which there are many within and outside of Yaffs).</p>\n<p>Thus, if an object is deleted and it has hard links to it then we do the following:</p>\n<ul>\n<li>\n<p>Select one of the object\'s hard links.</p>\n </li>\n<li>\n<p>Rename the object to the name in the hard link.</p>\n </li>\n<li>\n<p>Delete the hard link pseudo-object.</p>\n </li>\n</ul>\n<h2 class=\"western\">12.5 Symbolic links and special objects</h2>\n<p>These object types just store values that are needed to provide a full POSIX file system.</p>\n<p>A symbolic link object saves a symbolic link string that is used to provide the POSIX symbolic string mechanism.</p>\n<p>A special object is used to store entries for device numbers, pipes and other similar special objects.</p>\n<h2 class=\"western\">12.6 File objects</h2>\n<p>The yaffs_Objects have a type and a variant portion which is a union of different data required to hold the state of different object types.</p>\n<p>The file objects have type YAFFS_OBJECT_TYPE_FILE, and an associated file variant. This stores the following main values:</p>\n<ul>\n<li>\n<p><span style=\"font-family: Liberation Serif, serif;\">file_size: file size</span></p>\n </li>\n<li>\n<p><span style=\"font-family: Liberation Serif, serif;\">top_level: depth of the Tnode tree</span></p>\n </li>\n<li>\n<p><span style=\"font-family: Liberation Serif, serif;\">top: pointer to top of Tnode tree</span></p>\n </li>\n</ul>\n<p>The meaning of the file size is quite obvious. This is the current length of the file. Note that a file might have holes in it caused by seeking forward past the extents of the file.</p>\n<p>The top and top_level work together to control the Tnode trees. </p>\n<h3 class=\"western\" style=\"page-break-before: always\">12.6.1 Tnode tree</h3>\n<p>Each file has a tnode tree to provide the mapping from file position to actual NAND chunk address. top is a pointer to the top of the tnode tree</p>\n<p><img src=\"data:image/png;base64,[encoded data, 20236 characters]\" width=\"385\" height=\"378\" alt=\"image\" id=\"Object1\" /> <br style=\"clear: left;\" />\n<br />\n<br />\n</p>\n<p>The tnode tree is made up of tnodes (tree nodes) arranged in levels, each of which holds either:</p>\n<ul>\n<li>\n<p>At levels greater than 0, a tnode has 8 pointers to other tnodes in the next level down.</p>\n </li>\n<li>\n<p>At level 0, a tnode has 16 NAND chunk Ids which identify the chunk\'s location in RAM.</p>\n </li>\n</ul>\n<p>These numbers are powers of 2 which makes for simple look-ups by just applying bitmasks. The code that traverses this tree is in yaffs_find_tnode_0().</p>\n<p>As the file size grows, more tnodes are added and as the levels fill, more levels are added. If the file is truncated or resized downwards, then the tree is pruned. If a chunk in a file is replaced (eg. data is overwritten or copied by garbage collection) then the tnode tree must be updated to reflect the change.</p>\n<p>Tnodes typically make up the bulk of the Yaffs\' RAM usage.</p>\n<h1 class=\"western\">13 How various mechanisms work</h1>\n<p>Having looked at the Yaffs data structures, we now consider how some of the mechanisms in Yaffs operates. This is most easily done by walking through some operations that Yaffs performs.</p>\n<h2 class=\"western\">13.1 Block and chunk management</h2>\n<h3 class=\"western\">13.1.1 Block states</h3>\n<p>Yaffs tracks the state of each block and chunk in the partition. This information is first built up during scanning (or recovered from a checkpoint). A block may be in one of the following states (see definition of enum yaffs_block_state):</p>\n<table cellpadding=\"4\" style=\"width: 605px; border-spacing: 0px;\">\n<col width=\"146\" /> <col width=\"441\" />\n<tr valign=\"top\">\n <td style=\"border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: none; padding-top: 0.1cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0cm; width: 146px;\">\n <p>UNKNOWN</p>\n  </td>\n <td style=\"border: 1px solid #000000; padding: 0.1cm; width: 441px;\">\n <p>The block state is not yet known.</p>\n  </td>\n</tr>\n<tr valign=\"top\">\n <td style=\"border-top: none; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: none; padding-top: 0cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0cm; width: 146px;\">\n <p>NEEDS_SCANNING</p>\n  </td>\n <td style=\"border-top: none; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000; padding-top: 0cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0.1cm; width: 441px;\">\n <p>During pre-scanning it has been determined that this block has something on it and needs scanning.</p>\n  </td>\n</tr>\n<tr valign=\"top\">\n <td style=\"border-top: none; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: none; padding-top: 0cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0cm; width: 146px;\">\n <p>SCANNING</p>\n  </td>\n <td style=\"border-top: none; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000; padding-top: 0cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0.1cm; width: 441px;\">\n <p>This block is currently being scanned.</p>\n  </td>\n</tr>\n<tr valign=\"top\">\n <td style=\"border-top: none; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: none; padding-top: 0cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0cm; width: 146px;\">\n <p>EMPTY</p>\n  </td>\n <td style=\"border-top: none; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000; padding-top: 0cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0.1cm; width: 441px;\">\n <p>This block has nothing in it (is erased) and may be used for allocation. The block can get to this state by being erased.</p>\n  </td>\n</tr>\n<tr valign=\"top\">\n <td style=\"border-top: none; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: none; padding-top: 0cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0cm; width: 146px;\">\n <p>ALLOCATING</p>\n  </td>\n <td style=\"border-top: none; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000; padding-top: 0cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0.1cm; width: 441px;\">\n <p>This is the block currently being used for allocation by the chunk allocator.</p>\n  </td>\n</tr>\n<tr valign=\"top\">\n <td style=\"border-top: none; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: none; padding-top: 0cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0cm; width: 146px;\">\n <p>FULL</p>\n  </td>\n <td style=\"border-top: none; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000; padding-top: 0cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0.1cm; width: 441px;\">\n <p>All the chunks in this block have been allocated and at least one chunk contains useful information that has not yet been deleted.</p>\n  </td>\n</tr>\n<tr valign=\"top\">\n <td style=\"border-top: none; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: none; padding-top: 0cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0cm; width: 146px;\">\n <p>DIRTY</p>\n  </td>\n <td style=\"border-top: none; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000; padding-top: 0cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0.1cm; width: 441px;\">\n <p>All the chunks in this block have been allocated and all have been deleted. The block might have been in the FULL or COLLECTING state before this. This block can now be erased and returned to EMPTY state.</p>\n  </td>\n</tr>\n<tr valign=\"top\">\n <td style=\"border-top: none; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: none; padding-top: 0cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0cm; width: 146px;\">\n <p>CHECKPOINT</p>\n  </td>\n <td style=\"border-top: none; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000; padding-top: 0cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0.1cm; width: 441px;\">\n <p>This block has checkpoint data in it. When the checkpoint is invalidated this block will be erased and returned to the EMPTY state.</p>\n  </td>\n</tr>\n<tr valign=\"top\">\n <td style=\"border-top: none; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: none; padding-top: 0cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0cm; width: 146px;\">\n <p>COLLECTING</p>\n  </td>\n <td style=\"border-top: none; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000; padding-top: 0cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0.1cm; width: 441px;\">\n <p>This block is being garbage collected. As soon as all live data has been inspected this block becomes DIRTY.</p>\n  </td>\n</tr>\n<tr valign=\"top\">\n <td style=\"border-top: none; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: none; padding-top: 0cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0cm; width: 146px;\">\n <p>DEAD</p>\n  </td>\n <td style=\"border-top: none; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000; padding-top: 0cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0.1cm; width: 441px;\">\n <p>This block has been retired or was marked bad. This is a terminal state.</p>\n  </td>\n</tr>\n</table>\n<p><img src=\"data:image/png;base64,[encoded data, 42088 characters]\" width=\"575\" height=\"510\" alt=\"image\" id=\"Object3\" /> <br style=\"clear: left;\" />\n<br />\n<br />\n</p>\n<p>The regular runtime states are; EMPTY, ALLOCATING, FULL, COLLECTING and DIRTY.</p>\n<p>The checkpoint state is used for checkpoint blocks.</p>\n<p>The DEAD state is the terminal state for blocks that were retired because they were either marked bad or an error was detected.</p>\n<h3 class=\"western\">13.1.2 Block and chunk allocation</h3>\n<p>An available chunk must be allocated before it can be written. The chunk allocation mechanism is provided by yaffs_alloc_chunk() and is very simple. Each yaffs_dev has a current block that it is allocating from. This is termed the <i><b>allocation block </b></i><i><b>(alloc_block)</b></i>. Chunks are allocated sequentially from the allocation block. As the chunks are allocated, block and chunk management information is updated, including the block\'s pages_in_use count and the chunk use bitmap.</p>\n<p>When the block is fully allocated, another empty block is selected to become the allocation block. The blocks are selected by searching upwards from the previous allocation block.</p>\n<p>In older versions of Yaffs, the Yaffs scanning would identify the allocation block being used when the file system was last shut down and would continue allocation from that point. This had the benefit of continuing to use the same block and slightly reduce garbage creation. However, doing this could potentially cause problems due to attempting to write a block that had been in the middle of a write when power was lost. Thus Yaffs now always starts allocation on a new block after a mount. This slightly increases the amount of garbage (typically by an insignificant amount) but improves robustness.</p>\n<h3 class=\"western\">13.1.3 A word about wear leveling</h3>\n<p>Since flash memory blocks can only endure a limited number of writes and erases ( termed the flash endurance), a flash file system needs to ensure that the same few blocks are not overwritten continuously causing those blocks to wear out while the other blocks are hardly used at all.. Instead it is important that the file system spreads out the wear.</p>\n<p>This is extremely important in a file system such as FAT which uses a limited set of logical blocks to store the file allocation table entries which get modified frequently. If FAT is used with a static logical to physical block mapping then the file allocation table blocks will wear out far before other blocks causing premature device failure. Thus, for FAT, it is very important that the logical to physical mapping gets stirred up a bit to cause the file allocation tables to be written to different physical blocks, thus leveling out the wear.</p>\n<p>Wear leveling is far less of a concern in a log structured file system such as Yaffs since we always write to the end of the log and thus don\'t keep on overwriting the same blocks.</p>\n<p>There are basically two ways to achieve wear leveling:</p>\n<ul>\n<li>\n<p><span style=\"font-family: Liberation Serif, serif;\">Use a specifically written set of functions that actively perform wear leveling.</span></p>\n </li>\n<li>\n<p><span style=\"font-family: Liberation Serif, serif;\">Allow a degree of wear leveling to happen as a side effect of other activity.</span></p>\n </li>\n</ul>\n<p>Yaffs takes the second approach.</p>\n<p>Firstly, being log structured, Yaffs inherently spreads out the wear by performing all writes in sequence. That means that we don\'t single out a few blocks for a specific purpose and write them more than others.</p>\n<p>Secondly, blocks are allocated serially from the erased blocks in the partition. Thus the process of erasing (after deletion of garbage collection) and then allocating blocks does tend to spread the block use and provides a level of wear leveling.</p>\n<p>Thus, even though there is no code to specifically perform wear leveling it does happen as a side effect of other activity.</p>\n<p>This strategy performs well and has survived many accelerated lifetime tests in both simulations and on real NAND-based products.</p>\n<h3 class=\"western\">13.1.4 Management of yaffs_tnode and yaffs_obj structures</h3>\n<p>yaffs_tnodes and yaffs_objs are dynamically created and released as they are needed. </p>\n<p>The allocation and management could be done by just using the standard memory allocator (malloc, kmalloc etc), but this could cause performance problems, particularly in embedded systems which tend to have rather simplistic memory allocators. </p>\n<p>The allocation and deletion of many small structures can cause memory fragmentation causing out-of-memory and slowdown problems.</p>\n<p>To prevent these problems, Yaffs manages these objects internally. Yaffs creates many structures (100 or so) at a time and then allocates them singly from a free list. When structures are released they are placed on the free list for reuse.</p>\n<h2 class=\"western\">13.2 Internal cache</h2>\n<p>This describes the standard Yaffs internal cache implementation. Alternative caches have been devised for other purposes and at some future point Yaffs might be extended to support pluggable cache policies.</p>\n<p>The main purpose of the internal cache is to reduce NAND access for badly behaved applications which perform many small reads and writes. Believe it or not, but there are applications out there that read or write files a few bytes at a time:</p>\n<p class=\"code-western\"><code class=\"western\">while(...)<br />\nwrite(h,buf,1);</code></p>\n<p style=\"margin-left: 1.25cm\"><br />\n<br />\n</p>\n<p>This sort of behavior would be terrible for performance and flash memory life if each read or write operation resulted in a flash access. Yaffs provides an internal cache to mitigate against this sort of behaviour.</p>\n<p>The Yaffs internal cache is called a “Short Op Cache” (short operation cache) and only comes in to play for operations which are not chunk aligned. The caching mechanism is very simple and was primarily written for less sophisticated OSs that lack their own file caching layer. The cache is still beneficial in OSs like Linux, which provide a caching layer, because it caches both the read and write path. Thus, while short reads will be serviced by the Linux page cache, the short op cache does address non-chunk aligned writes.</p>\n<p>Page aligned reads/writes bypass the cache unless that chunk is already in the cache, except when inband tags are used. Inband tags always require the cache because the cache is used to build up the buffer where the tags are attached to the data chunk being written.</p>\n<p>The cache is stored in an array of cache entries. The number of cache entries is set in the yaffs_dev parameters n_caches and the cache is configured during initialisation. n_caches of zero disables the cache. The cache management algorithms are simplistic and probably don\'t scale well to very large numbers. This means that it is probably best to stick with around 5 to 20 cache entries.</p>\n<p>Each cache entry holds:</p>\n<ul>\n<li>\n<p>obj_id, chunk id, nbytes (the tag info of the chunk being cached)</p>\n </li>\n<li>\n<p>The actual data bytes</p>\n </li>\n<li>\n<p>Cache slot status (last used counter, dirty,...)</p>\n </li>\n</ul>\n<p>Finding an unused cache entry is a simple operation. We just iterate through the cache entries searching for one that is not assigned. If all cache entries are busy then a cache push-out is performed to free up a cahce entry.</p>\n<p>Whenever a cache entry is accessed (read or written) the last-use counter is is set to an incrementing number. This counter value is used to drive the least-recently-used (LRU) algorithm.</p>\n<p>Cache entries which have been modified and not yet written back to flash are marked with a dirty flag. This is tells us whether we need to write out the data during a flush or push-out.</p>\n<p>A push-out happens whenever the cache is full and we need to push an entry out of the cache to make space to load a new entry. Yaffs uses the LRU algorithm to select the LRU cache entry, write it out if needed and then assign that for use.</p>\n<p>Whenever a file is flushed (file flush or close), the file\'s dirty entries are written out. At certain times (eg. before an unmount or at sync()) the entire cache is flushed.</p>\n<p>This caching policy is gives a useful performance improvement with very simple algorithms (ie good bang-for-bucks).</p>\n<p>Apart from its normal caching function, the short op cache also does much of the heavy lifting for inband tags support since all the inband tags accesses are not chunk aligned and must typically be re-aligned. The cache makes this easy.</p>\n<h2 class=\"western\">13.3 Scanning</h2>\n<p>Scanning is the process whereby file system state is rebuilt from scratch. This happens on mounting a Yaffs partition if no checkpoint data is available or if the mounting was told to ignore the checkpoint data.</p>\n<p>Scanning involves reading the tags from all the active chunks in the system so can take quite a while, but probably less time than you\'d expect.</p>\n<p>The scanning process is different for Yaffs1 vs Yaffs2 because of the differences mentioned before.</p>\n<h3 class=\"western\">13.3.1 Yaffs1 scanning</h3>\n<p>Yaffs1 scanning is rather straight forward because Yaffs1 uses deletion markers.</p>\n<p>All we really need to do is read the tags off all the chunks in the partition and determine if the chunk is active. Order is not important and blocks could be read in any order. If the deletion marker has not been set then it is active and we need to add the chunk to the file system state as follows:</p>\n<p>If the chunk is a data chunk (chunk_id &gt; 0) then the chunk must be added to the relevant file\'s tnode tree. If the object does not exist, then we create it in lost+found, although it has no name and other file details yet.</p>\n<p>If the chunk is an object header (chunk_id == 0) then the object must be created (or it might already exist in lost + found and we need to fix up its details and slot it into the correct part of the directory tree.</p>\n<p>If at any time during scanning we find that we are reading a second chunk with the same obj_id:chunk_id as a previously encountered chunk then the 2-bit serial number is used to resolve the dispute.</p>\n<p>Once the scanning is complete we still need to fix up a few things: </p>\n<p>Hard links must be connected up properly (it is more efficient to defer this until after the scanning has completed).</p>\n<p>Also, objects which were marked as unlinked must be deleted since there are no longer handles open to these objects.</p>\n<h3 class=\"western\">13.3.2 Yaffs2 scanning</h3>\n<p>Yaffs2 has no deletion markers which makes the scanning significantly more complex.</p>\n<p>The first thing that needs to be done is to pre-scan the blocks to determine the sequence number for the blocks. The list of blocks and sequence numbers is then sorted to make a chronologically ordered list.</p>\n<p>Yaffs then scans <i><b>backwards</b></i> through these blocks (ie in reverse chronological order). Thus, the first encountered obj_id:chunk_id pair is the current one and subsequent chunks with those tags are out of date.</p>\n<p style=\"margin-left: 1.25cm\">We read the tags for each chunk in each block. </p>\n<p style=\"margin-left: 1.25cm\">If it is a data chunk ( ie. chunk_id &gt; 0) then:</p>\n<ul>\n<li>\n<p>If a chunk with the same obj_id:chunk_id has already been found then this is not the current chunk. Delete this one.</p>\n </li>\n<li>\n<p>Else if the object is marked as deleted, or corrupted, then delete it.</p>\n </li>\n<li>\n<p>Else if the object does not yet exist then this chunk was written since the last object header write for this object so this chunk must be the last written chunk in the file and must have happened just before an unclean shutdown with the file still open. We can create the file and use the chunk_id and nbytes to set the file extents.</p>\n </li>\n<li>\n<p>Else if the object does exist and the chunk lies beyond the object\'s file scan size (extents) then it is a truncated chunk and can be deleted.</p>\n </li>\n<li>\n<p>Else it is placed into the file\'s tnode tree.</p>\n </li>\n</ul>\n<p style=\"margin-left: 1.25cm\">If it is an object header (ie. chunk_id == 0) then:</p>\n<ul>\n<li>\n<p>If the object is in the deleted directory then mark the object as deleted and set the object\'s shrink size to zero.</p>\n </li>\n<li>\n<p>Else if an object header has not yet been found for this object, then this is the most current object header and holds the most current name etc. If no data chunks have yet been found for this chunk then the size in the object header is also the file extents. The file size is used to set the file scan size since at the time it was written the file did not extend past that point and we can safely ignore further data chunks for that file that extend past that point.</p>\n </li>\n<li>\n<p>Else just use the file size as the scan size if it is smaller than the current file scan size.</p>\n </li>\n<li>\n<p>Else this an obsolete object header. It is deleted.</p>\n </li>\n</ul>\n<p>A bit more explanation is probably needed to describe the file scan size. The whole purpose of this is to determine data chunks that should be ignored due to the file being truncated.</p>\n<h2 class=\"western\">13.4 Checkpoint</h2>\n<p>Mount scanning takes quite a lot of time and slows mounting, though perhaps by less than you\'d think. Checkpointing is a mechanism to speed the mounting by taking a snapshot of the Yaffs runtime state at unmount or sync() and then reconstituting the runtime state on re-mounting. The speed up is dramatic.</p>\n<p>The actual checkpoint mechanism is quite simple. A “stream” of data is written to a set of blocks which are marked as holding checkpoint data and the important runtime state is written to the stream.</p>\n<p>Not all state needs to be saved, only the state needed to reconstitute the structure of the runtime data. For example, file metadata need not be saved since it is very easy to load that through lazy-loading.</p>\n<p>The checkpoint stores data in the following order:</p>\n<ul>\n<li>\n<p><span style=\"font-family: Liberation Serif, serif;\">Start marker, including checkpoint format id.</span></p>\n </li>\n<li>\n<p><span style=\"font-family: Liberation Serif, serif;\">yaffs_dev information</span></p>\n </li>\n<li>\n<p><span style=\"font-family: Liberation Serif, serif;\">Block information</span></p>\n </li>\n<li>\n<p><span style=\"font-family: Liberation Serif, serif;\">Chunk flags</span></p>\n </li>\n<li>\n<p><span style=\"font-family: Liberation Serif, serif;\">Objects, including file structure</span></p>\n </li>\n<li>\n<p><span style=\"font-family: Liberation Serif, serif;\">End marker</span></p>\n </li>\n<li>\n<p><span style=\"font-family: Liberation Serif, serif;\">Checksum</span></p>\n </li>\n</ul>\n<p>The checkpoint validity is ensured by the following mechanisms:</p>\n<ul>\n<li>\n<p><span style=\"font-family: Liberation Serif, serif;\">The data is stored using whatever ECC mechanisms are in place.</span></p>\n </li>\n<li>\n<p><span style=\"font-family: Liberation Serif, serif;\">The start marker includes a checkpoint version so that an obsolete checkpoint will not be read if the checkpoint code changes.</span></p>\n </li>\n<li>\n<p><span style=\"font-family: Liberation Serif, serif;\">Data is written to the stream as structured records, each with a type and size.</span></p>\n </li>\n<li>\n<p><span style=\"font-family: Liberation Serif, serif;\">The end marker must be read when expected.</span></p>\n </li>\n<li>\n<p><span style=\"font-family: Liberation Serif, serif;\">Two checksums are maintained across the whole checkpoint data set.</span></p>\n </li>\n</ul>\n<p>If any checks fail, the checkpoint is ignored and the state is re-scanned.</p>\n<p>The astute reader might notice that block state changes as we\'re writing checkpoint blocks, so how do we manage to re-constitute the block states correctly? This is achieved by the following:</p>\n<ul>\n<li>\n<p><span style=\"font-family: Liberation Serif, serif;\">As we write the checkpoint, the checkpoint block allocation selects EMPTY blocks. We don\'t change the state as we\'re writing the checkpoint so their state is written to the checkpoint as EMPTY or CHECKPOINT, it does not really matter which.</span></p>\n </li>\n<li>\n<p><span style=\"font-family: Liberation Serif, serif;\">After reading the checkpoint, we know which blocks have been used to store checkpoint data. We update those blocks to reflect the CHECKPOINT state.</span></p>\n </li>\n</ul>\n<p>A checkpoint is invalidated by any modifications (writes, erases,...) thus any modification path also checks to see if there is a checkpoint and erases it.</p>\n<p>The regular Yaffs block allocator and garbage collection logic also needs to be aware of the approximate size of the checkpoint so that these can ensure enough spare space is reserved to store a checkpoint. There is a calculation that updates the value whenever the number of objects etc changes.</p>\n<h2 class=\"western\">13.5 Extended tags and packed tags</h2>\n<p>Extended tags is an abstraction of a way to store more information in the tags, allowing for faster scan times. Packed Tags is a physical implementation of the storage of extended tags.</p>\n<p>When we\'re scanning we really only need to build up the structure of the file system. In other words, rebuild the directory relationships, tnode trees and such. Much of the detail such as file names, permissions etc can be lazy loaded if and when needed.</p>\n<p>This required storing extra information, such as the parent directory and object type, in the tags of object headers. But how do we do this without enlarging the tags size?</p>\n<p>Object headers always have a chunk_id of zero and n_bytes has no meaning because it is not a data chunk. By using a single bit to identify object headers we suddenly open up a whole lot of space that we can stuff full of useful data. By being clever as to what data we use, we can pack in the important data in most circumstances.</p>\n<p>Sometimes, for example very large files, the packing will not work because there are insufficient bits to hold the field so we just write regular tags instead. That\'s OK since there can only be few such files in the system so the performance reduction only impacts very few files and the system level impact is unnoticeable. A simple, cheap, strategy that gives speed up 99% of the time is a very handy one.</p>\n<p>Other details are lazy-loaded on demand. This will happen when the object is looked up (eg. by a file open or searching for the file in the directory).</p>\n<h2 class=\"western\">13.6 Block summaries</h2>\n<p>Scanning requires that the tags for each chunk are read so that they can be inspected. Reading the tags from each chunk can be time consuming. Thus, block summaries were added in 2011.</p>\n<p>Block summaries write all the tags data for chunks in the block into the last few (typically only one) chunk in a block. This allows all the tags for chunks in that block to be read in one hit. Depending on the system throughput (CPU, RAM and flash speeds), this can speed up mount time dramatically.</p>\n<p>Note that the block summary does not replace the tags attached to each chunk. Both are written. Thus, if the whole block is not written (and the block summary is thus not written), the chunk tags can still be read and used.</p>\n<p>If a block summary is not available for a block, then the old mechanism is still used to scan the tags on each chunk.</p>\n<h2 class=\"western\">13.7 Inband tags</h2>\n<p>Thus far we have considered chunks where there are sufficient unallocated bytes in the spare (or out of band) area to store the tags. </p>\n<p>But what happens if we don\'t have enough space in the spare area to store the tags? Inband tags to the rescue! </p>\n<p>With inband tags we store the tags in the flash data area alongside the data. This gives us far more flexibility in the types of storage that Yaffs can support.</p>\n<p>There are three major penalties with inband tags:</p>\n<ul>\n<li>\n<p>Due to the loss of chunk alignment, all transactions must pass through the short op cache. This costs an extra memcpy().</p>\n </li>\n<li>\n<p></p>\n </li>\n<li>\n<p>Reading tags during scanning etc can involve reading the whole page, making this slower. The impact is minimised by using checkpointing or block summaries.</p>\n </li>\n</ul>\n<p>Thus, it is better, performance wise, to only use inband tags when regular tags will not work.</p>\n<h2 class=\"western\">13.8 Soft deletion</h2>\n<p>Soft deletion is a mechanism that was added to speed up file deletion in Yaffs1 mode.</p>\n<p>Looking back to the description of how files are stored in Yaffs1, you can see that deleting a file involves writing the deletion marker of every data chunk in the file. This can take quite some time for large files.</p>\n<p>The soft deletion mechanism was added to avoid writing all those deletion markers. Instead of writing the deletion markers, soft deletion instead tracks the number of chunks in each block that belong to deleted files and leaves the clean up to the garbage collector.</p>\n<p>When the garbage collector looks at a block it can see what current chunks (ie chunks not yet deleted) belong to deleted files and does not copy those, thus effectively deleting the chunk. Once all the chunks associated with a deleted file have cleaned up by the garbage collector the file header object can also be deleted.</p>\n<p>Yaffs2 mode does not write deletion markers and thus does not use soft deletion.</p>\n</div>\n      \n  </div>\n\n</article>\n\n\n  </div>\n\n              </section>\n\n                </div>\n  </div>\n\n      <footer class=\"footer container\" role=\"contentinfo\">\n        <div class=\"primary_footer row\">\n            <div class=\"col-sm-3\">\n                  <div class=\"region region-footer-col1\">\n    <section id=\"block-yaffs-block-6\" class=\"block block-block-content block-block-content6c2d4b45-4dba-4b2d-8b9f-76701bf27533 clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<ul class=\"fa-ul\">\n<li><i class=\"fa-li fa fa-phone\"></i>+44 (0)1223 811679</li>\n<li><i class=\"fa-li fa fa-envelope\"></i><a href=\"denied:mailto:info@aleph1.co.uk?Subject=Website contact\" target=\"_top\">info@aleph1.co.uk</a></li>\n</ul>\n</div>\n      \n  </section>\n\n\n  </div>\n\n            </div>\n            <div class=\"col-sm-3\">\n                \n            </div>\n            <div class=\"col-sm-3\">\n                \n            </div>\n            <div class=\"col-sm-3\">\n                  <div class=\"region region-footer-col4\">\n    <section id=\"block-footerlegal\" class=\"block block-block-content block-block-content78ab593d-35b6-4772-a141-30216e7fcbb2 clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<p class=\"text-align-right\">&nbsp;<a href=\"/legal\">Legal &amp; Cookies</a></p>\n</div>\n      \n  </section>\n\n<section id=\"block-cookieinfo\" class=\"block block-block-content block-block-content4848c58d-90df-4819-81d8-0f9568eeeaac clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<p class=\"text-align-justify\"><br />\nWe use <a href=\"/legal\">cookies on this site</a>. 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class=\"sr-only\">Toggle navigation</span>\n            <span class=\"icon-bar\"></span>\n            <span class=\"icon-bar\"></span>\n            <span class=\"icon-bar\"></span>\n          </button>\n              </div>\n\n                    <div id=\"navbar-collapse\" class=\"navbar-collapse collapse\">\n            <div class=\"region region-navigation-collapsible\">\n    <nav role=\"navigation\" aria-labelledby=\"block-mainnavigation-menu\" id=\"block-mainnavigation\">\n            <h2 class=\"sr-only\" id=\"block-mainnavigation-menu\">Main navigation</h2>\n\n      \n              <ul class=\"menu nav navbar-nav\">\n                            <li>\n        <a href=\"/\" data-drupal-link-system-path=\"&lt;front&gt;\">Home</a>\n                  </li>\n                        <li>\n        <a href=\"/support\" title=\"Help for Yaffs\" data-drupal-link-system-path=\"node/380\">Support</a>\n                  </li>\n                        <li>\n        <a href=\"/documents\" 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charset=UTF-8\";}s:13:\"cache-control\";a:1:{i:0;s:8:\"no-cache\";}s:4:\"date\";a:1:{i:0;s:29:\"Thu, 26 Oct 2017 11:58:52 GMT\";}}s:15:\"\0*\0cacheControl\";a:0:{}}s:10:\"\0*\0content\";s:9205:\"<!DOCTYPE html>\n<html  lang=\"en\" dir=\"ltr\" prefix=\"content: http://purl.org/rss/1.0/modules/content/  dc: http://purl.org/dc/terms/  foaf: http://xmlns.com/foaf/0.1/  og: http://ogp.me/ns#  rdfs: http://www.w3.org/2000/01/rdf-schema#  schema: http://schema.org/  sioc: http://rdfs.org/sioc/ns#  sioct: http://rdfs.org/sioc/types#  skos: http://www.w3.org/2004/02/skos/core#  xsd: http://www.w3.org/2001/XMLSchema# \">\n  <head>\n    <head-placeholder token=\"z6Ij8H6Q4CxM6Lku2U68tVT-fjLGhtBkF6BWBZUTQIgECNmCdm8i3MBE8rJ5unJ3X0S6qAUI7Q\">\n    <title>Support | Yaffs - A Flash File System for embedded use</title>\n    <css-placeholder token=\"z6Ij8H6Q4CxM6Lku2U68tVT-fjLGhtBkF6BWBZUTQIgECNmCdm8i3MBE8rJ5unJ3X0S6qAUI7Q\">\n    <js-placeholder 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class=\"sr-only\">Toggle navigation</span>\n            <span class=\"icon-bar\"></span>\n            <span class=\"icon-bar\"></span>\n            <span class=\"icon-bar\"></span>\n          </button>\n              </div>\n\n                    <div id=\"navbar-collapse\" class=\"navbar-collapse collapse\">\n            <div class=\"region region-navigation-collapsible\">\n    <nav role=\"navigation\" aria-labelledby=\"block-mainnavigation-menu\" id=\"block-mainnavigation\">\n            <h2 class=\"sr-only\" id=\"block-mainnavigation-menu\">Main navigation</h2>\n\n      \n              <ul class=\"menu nav navbar-nav\">\n                            <li>\n        <a href=\"/\" data-drupal-link-system-path=\"&lt;front&gt;\">Home</a>\n                  </li>\n                        <li class=\"active\">\n        <a href=\"/support\" title=\"Help for Yaffs\" data-drupal-link-system-path=\"node/380\">Support</a>\n                  </li>\n                        <li>\n        <a href=\"/documents\" data-drupal-link-system-path=\"documents\">Documents</a>\n                  </li>\n                        <li>\n        <a href=\"/get-yaffs\" data-drupal-link-system-path=\"node/382\">Download</a>\n                  </li>\n                        <li>\n        <a href=\"/about-us\" data-drupal-link-system-path=\"node/325\">About us</a>\n                  </li>\n                        <li>\n        <a href=\"/contact\" data-drupal-link-system-path=\"node/73\">Contact</a>\n                  </li>\n        </ul>\n  \n\n\n  </nav>\n<div class=\"search-block-form block block-search block-search-form-block\" data-drupal-selector=\"search-block-form\" id=\"block-searchform\" role=\"search\">\n  \n    \n      <form action=\"/search/node\" method=\"get\" id=\"search-block-form\" accept-charset=\"UTF-8\">\n  <div class=\"form-item js-form-item form-type-search js-form-type-search form-item-keys js-form-item-keys form-no-label form-group\">\n      <label for=\"edit-keys\" class=\"control-label sr-only\">Search</label>\n  \n  \n  <div class=\"input-group\"><input title=\"Enter the terms you wish to search for.\" data-drupal-selector=\"edit-keys\" class=\"form-search form-control\" placeholder=\"Search\" type=\"search\" id=\"edit-keys\" name=\"keys\" value=\"\" size=\"15\" maxlength=\"128\" data-toggle=\"tooltip\" /><span class=\"input-group-btn\"><button type=\"submit\" value=\"Search\" class=\"button js-form-submit form-submit btn-primary btn icon-only\" name=\"\"><span class=\"sr-only\">Search</span><span class=\"icon glyphicon glyphicon-search\" aria-hidden=\"true\"></span></button></span></div>\n\n  \n  \n  </div>\n<div class=\"form-actions form-group js-form-wrapper form-wrapper\" data-drupal-selector=\"edit-actions\" id=\"edit-actions\"></div>\n\n</form>\n\n  </div>\n\n  </div>\n\n        </div>\n                    </div>\n          </header>\n  \n  <div role=\"main\" class=\"main-container container js-quickedit-main-content\">\n    <div class=\"row\">\n\n            \n            \n                  <section class=\"col-sm-12\">\n\n                                      <div class=\"highlighted\">  <div class=\"region region-highlighted\">\n      \n<drupal-render-placeholder callback=\"Drupal\\Core\\Render\\Element\\StatusMessages::renderMessages\" arguments=\"0\" token=\"_HAdUpwWmet0TOTe2PSiJuMntExoshbm1kh2wQzzzAA\"></drupal-render-placeholder>\n\n  </div>\n</div>\n                  \n                \n                \n                                      \n                  \n                          <a id=\"main-content\"></a>\n            <div class=\"region region-content\">\n        <h1 class=\"page-header\"><span property=\"schema:name\">Support</span>\n</h1>\n\n<drupal-render-placeholder callback=\"Drupal\\block\\BlockViewBuilder::lazyBuilder\" arguments=\"0=yaffs_local_tasks&amp;1=full&amp;2\" token=\"w23j7iE363xxUJCXKAtJQdcjG4ZZoQ4QEIV26-ZdK5w\"></drupal-render-placeholder>  <article role=\"article\" 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It\'s best to start by searching the <a href=\"http://www.aleph1.co.uk/lurker/list/yaffs.html\">list archive</a> to see if someone has already asked the same question.</p>\n<p>If you feel uncomfortable asking your question on an open mailing list you can try mailing us, but we (or you) may say \'You should be paying for this\', and if that is agreed, then we can accept payments via PayPal or other means.</p>\n<p>Serious long-term work is best done as a negotiated contract; for instance we have built special features for clients with very particular needs. If you think you may want this sort of help then <a href=\"/contact\">contact us</a>, telling us a bit about your problem.</p>\n</div>\n      \n  </div>\n\n</article>\n\n\n  </div>\n\n              </section>\n\n                </div>\n  </div>\n\n      <footer class=\"footer container\" role=\"contentinfo\">\n        <div class=\"primary_footer row\">\n            <div class=\"col-sm-3\">\n                  <div class=\"region region-footer-col1\">\n    <section id=\"block-yaffs-block-6\" class=\"block block-block-content block-block-content6c2d4b45-4dba-4b2d-8b9f-76701bf27533 clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<ul class=\"fa-ul\">\n<li><i class=\"fa-li fa fa-phone\"></i>+44 (0)1223 811679</li>\n<li><i class=\"fa-li fa fa-envelope\"></i><a href=\"denied:mailto:info@aleph1.co.uk?Subject=Website contact\" target=\"_top\">info@aleph1.co.uk</a></li>\n</ul>\n</div>\n      \n  </section>\n\n\n  </div>\n\n            </div>\n            <div class=\"col-sm-3\">\n                \n            </div>\n            <div class=\"col-sm-3\">\n                \n            </div>\n            <div class=\"col-sm-3\">\n                  <div class=\"region region-footer-col4\">\n    <section id=\"block-footerlegal\" class=\"block block-block-content block-block-content78ab593d-35b6-4772-a141-30216e7fcbb2 clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<p class=\"text-align-right\">&nbsp;<a href=\"/legal\">Legal &amp; Cookies</a></p>\n</div>\n      \n  </section>\n\n<section id=\"block-cookieinfo\" class=\"block block-block-content block-block-content4848c58d-90df-4819-81d8-0f9568eeeaac clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<p class=\"text-align-justify\"><br />\nWe use <a href=\"/legal\">cookies on this site</a>. 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class=\"row\">\n\n            \n            \n                  <section class=\"col-sm-12\">\n\n                                      <div class=\"highlighted\">  <div class=\"region region-highlighted\">\n        <ol class=\"breadcrumb\">\n          <li >\n                  <a href=\"/features\">The best bits</a>\n              </li>\n          <li  class=\"active\">\n                  High and low level interfaces...\n              </li>\n      </ol>\n\n<drupal-render-placeholder callback=\"Drupal\\Core\\Render\\Element\\StatusMessages::renderMessages\" arguments=\"0\" token=\"_HAdUpwWmet0TOTe2PSiJuMntExoshbm1kh2wQzzzAA\"></drupal-render-placeholder>\n\n  </div>\n</div>\n                  \n                \n                \n                                      \n                  \n                          <a id=\"main-content\"></a>\n            <div class=\"region region-content\">\n        <h1 class=\"page-header\"><span>High and low level interfaces...</span>\n</h1>\n\n<drupal-render-placeholder callback=\"Drupal\\block\\BlockViewBuilder::lazyBuilder\" arguments=\"0=yaffs_local_tasks&amp;1=full&amp;2\" token=\"w23j7iE363xxUJCXKAtJQdcjG4ZZoQ4QEIV26-ZdK5w\"></drupal-render-placeholder>  <article role=\"article\" about=\"/features/high-and-low-level-interfaces\" class=\"what-is-special-about-yaffs is-promoted full clearfix\">\n\n  \n    \n\n  \n  <div class=\"content\">\n    \n  <div class=\"field field--name-field-icon-text field--type-string field--label-above\">\n    <div class=\"field--label\">Icon - text</div>\n              <div class=\"field--item\">fa-stethoscope</div>\n          </div>\n\n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\"><p>We provide a high level interface with the GPL version of Yaffs, so it\'s easy to use with Linux and other OS\'s that support POSIX.  This support includes directories, symbolic and hard links, through standard file system interface calls.</p>\n\n<p>But when you want to integrate Yaffs directly into your OS or your code, you\'ll most likely want to make use of the Yaffs Direct Interface or other low-level interfaces:</p>\n\n<ul><li>Application Interface: This is the interface that the application code uses to access the YAFFS file system.</li>\n	<li>RTOS Integration Interface: These are the functions that much be provided for YAFFS to access the RTOS system resources.</li>\n	<li>NAND Configuration and Access Interface: These are the functions that must be provided for YAFFS to access the NAND flash.</li>\n</ul><p>Have a look at the guides in the Documents section, to find out more about <a href=\"/documents\">integrating Yaffs</a>.</p></div>\n      \n  </div>\n\n</article>\n\n\n  </div>\n\n              </section>\n\n                </div>\n  </div>\n\n      <footer class=\"footer container\" role=\"contentinfo\">\n        <div class=\"primary_footer row\">\n            <div class=\"col-sm-3\">\n  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charset=UTF-8\";}s:13:\"cache-control\";a:1:{i:0;s:8:\"no-cache\";}s:4:\"date\";a:1:{i:0;s:29:\"Thu, 26 Oct 2017 11:24:46 GMT\";}}s:15:\"\0*\0cacheControl\";a:0:{}}s:10:\"\0*\0content\";s:9653:\"<!DOCTYPE html>\n<html  lang=\"en\" dir=\"ltr\" prefix=\"content: http://purl.org/rss/1.0/modules/content/  dc: http://purl.org/dc/terms/  foaf: http://xmlns.com/foaf/0.1/  og: http://ogp.me/ns#  rdfs: http://www.w3.org/2000/01/rdf-schema#  schema: http://schema.org/  sioc: http://rdfs.org/sioc/ns#  sioct: http://rdfs.org/sioc/types#  skos: http://www.w3.org/2004/02/skos/core#  xsd: http://www.w3.org/2001/XMLSchema# \">\n  <head>\n    <head-placeholder token=\"aEwVP6vDJFiv4UPj2df7gB84nPWPMje_ACo5OdWjnm7VqxzVinGvopqSHEJqe0oUsJTc8aBWHw\">\n    <title>YAFFS talk - slides from a presentation to FOSDEM in 2004 | Yaffs - A Flash File System for embedded use</title>\n    <css-placeholder token=\"aEwVP6vDJFiv4UPj2df7gB84nPWPMje_ACo5OdWjnm7VqxzVinGvopqSHEJqe0oUsJTc8aBWHw\">\n    <js-placeholder 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\n            \n                  <section class=\"col-sm-12\">\n\n                                      <div class=\"highlighted\">  <div class=\"region region-highlighted\">\n      \n<drupal-render-placeholder callback=\"Drupal\\Core\\Render\\Element\\StatusMessages::renderMessages\" arguments=\"0\" token=\"_HAdUpwWmet0TOTe2PSiJuMntExoshbm1kh2wQzzzAA\"></drupal-render-placeholder>\n\n  </div>\n</div>\n                  \n                \n                \n                                      \n                  \n                          <a id=\"main-content\"></a>\n            <div class=\"region region-content\">\n        <h1 class=\"page-header\"><span>YAFFS talk - slides from a presentation to FOSDEM in 2004</span>\n</h1>\n\n<drupal-render-placeholder callback=\"Drupal\\block\\BlockViewBuilder::lazyBuilder\" arguments=\"0=yaffs_local_tasks&amp;1=full&amp;2\" token=\"w23j7iE363xxUJCXKAtJQdcjG4ZZoQ4QEIV26-ZdK5w\"></drupal-render-placeholder>  <article role=\"article\" about=\"/yaffs-talk-slides-presentation-fosdem-2004\" class=\"book full clearfix\">\n\n  \n    \n\n  \n  <div class=\"content\">\n    \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<p>This info is significantly out of date, and we have removed it. You might be interested in one of these:</p>\n<ul>\n<li><a href=\"/documents/how-yaffs-works\">How Yaffs Works</a>&nbsp;</li>\n<li><a style=\"border-style: initial; border-color: initial; border-image: initial; outline-width: 0px; outline-style: initial; outline-color: initial; font-size: 12px; vertical-align: baseline; background-image: initial; background-attachment: initial; background-origin: initial; background-clip: initial; font-family: Verdana, Helvetica, Arial, sans-serif; line-height: 18px; border-width: 0px; padding: 0px; margin: 0px;\" href=\"/documents/yaffs-nand-flash-failure-mitigation\">Yaffs&nbsp;<span class=\"caps\" style=\"border-style: initial; border-color: initial; border-image: initial; outline-width: 0px; outline-style: initial; outline-color: initial; font-size: 0.9em; vertical-align: baseline; background-image: initial; background-attachment: initial; background-origin: initial; background-clip: initial; background-color: transparent; background-position: initial initial; background-repeat: initial initial; border-width: 0px; padding: 0px; margin: 0px;\">NAND</span>&nbsp;Failure Mitigation</a></li>\n<li><a href=\"yaffs-talk-pdf-slides-celf-2007\">Slides from CELF 2007</a></li>\n</ul>\n</div>\n      \n  </div>\n\n</article>\n\n\n  </div>\n\n              </section>\n\n                </div>\n  </div>\n\n      <footer class=\"footer container\" role=\"contentinfo\">\n        <div class=\"primary_footer row\">\n            <div class=\"col-sm-3\">\n                  <div class=\"region region-footer-col1\">\n    <section id=\"block-yaffs-block-6\" class=\"block block-block-content block-block-content6c2d4b45-4dba-4b2d-8b9f-76701bf27533 clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<ul class=\"fa-ul\">\n<li><i class=\"fa-li fa fa-phone\"></i>+44 (0)1223 811679</li>\n<li><i class=\"fa-li fa fa-envelope\"></i><a href=\"denied:mailto:info@aleph1.co.uk?Subject=Website contact\" target=\"_top\">info@aleph1.co.uk</a></li>\n</ul>\n</div>\n      \n  </section>\n\n\n  </div>\n\n            </div>\n            <div class=\"col-sm-3\">\n                \n            </div>\n            <div class=\"col-sm-3\">\n                \n            </div>\n            <div class=\"col-sm-3\">\n                  <div class=\"region region-footer-col4\">\n    <section id=\"block-footerlegal\" class=\"block block-block-content block-block-content78ab593d-35b6-4772-a141-30216e7fcbb2 clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<p class=\"text-align-right\">&nbsp;<a href=\"/legal\">Legal &amp; Cookies</a></p>\n</div>\n      \n  </section>\n\n<section id=\"block-cookieinfo\" class=\"block block-block-content block-block-content4848c58d-90df-4819-81d8-0f9568eeeaac clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<p class=\"text-align-justify\"><br />\nWe use <a href=\"/legal\">cookies on this site</a>. 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href=\"/documents\" data-drupal-link-system-path=\"documents\">Documents</a>\n                  </li>\n                        <li>\n        <a href=\"/get-yaffs\" data-drupal-link-system-path=\"node/382\">Download</a>\n                  </li>\n                        <li>\n        <a href=\"/about-us\" data-drupal-link-system-path=\"node/325\">About us</a>\n                  </li>\n                        <li>\n        <a href=\"/contact\" data-drupal-link-system-path=\"node/73\">Contact</a>\n                  </li>\n        </ul>\n  \n\n\n  </nav>\n<div class=\"search-block-form block block-search block-search-form-block\" data-drupal-selector=\"search-block-form\" id=\"block-searchform\" role=\"search\">\n  \n    \n      <form action=\"/search/node\" method=\"get\" id=\"search-block-form\" accept-charset=\"UTF-8\">\n  <div class=\"form-item js-form-item form-type-search js-form-type-search form-item-keys js-form-item-keys form-no-label form-group\">\n      <label for=\"edit-keys\" 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class=\"row\">\n\n            \n            \n                  <section class=\"col-sm-12\">\n\n                                      <div class=\"highlighted\">  <div class=\"region region-highlighted\">\n        <ol class=\"breadcrumb\">\n          <li >\n                  <a href=\"/features\">The best bits</a>\n              </li>\n          <li  class=\"active\">\n                  For closed source projects - try before you buy...\n              </li>\n      </ol>\n\n<drupal-render-placeholder callback=\"Drupal\\Core\\Render\\Element\\StatusMessages::renderMessages\" arguments=\"0\" token=\"_HAdUpwWmet0TOTe2PSiJuMntExoshbm1kh2wQzzzAA\"></drupal-render-placeholder>\n\n  </div>\n</div>\n                  \n                \n                \n                                      \n                  \n                          <a id=\"main-content\"></a>\n            <div class=\"region region-content\">\n        <h1 class=\"page-header\"><span>For closed source projects - try before you buy...</span>\n</h1>\n\n<drupal-render-placeholder callback=\"Drupal\\block\\BlockViewBuilder::lazyBuilder\" arguments=\"0=yaffs_local_tasks&amp;1=full&amp;2\" token=\"w23j7iE363xxUJCXKAtJQdcjG4ZZoQ4QEIV26-ZdK5w\"></drupal-render-placeholder>  <article role=\"article\" about=\"/features/closed-source-projects-try-you-buy\" class=\"what-is-special-about-yaffs is-promoted full clearfix\">\n\n  \n    \n\n  \n  <div class=\"content\">\n    \n  <div class=\"field field--name-field-icon-text field--type-string field--label-above\">\n    <div class=\"field--label\">Icon - text</div>\n              <div class=\"field--item\">fa-credit-card</div>\n          </div>\n\n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\"><p>When shopping for a software component, it\'s always useful to be able to try it out before buying.</p>\n\n<p>For your proprietary projects, the GPL version of Yaffs lets you do just that - download it, examine the code and test it out. Check out our documentation and videos.</p>\n\n<p>It\'s perfectly acceptable and safe to use the GNU GPL code inside your company, providing you don\'t ship a binary to anyone beyond it. That\'s when code disclosure and licensing provisions of the GNU GPL kick in. So before you do that, you\'ll want to talk to us about acquiring a paid Licence.</p></div>\n      \n  </div>\n\n</article>\n\n\n  </div>\n\n              </section>\n\n                </div>\n  </div>\n\n      <footer class=\"footer container\" role=\"contentinfo\">\n        <div class=\"primary_footer row\">\n            <div class=\"col-sm-3\">\n                  <div class=\"region region-footer-col1\">\n    <section id=\"block-yaffs-block-6\" class=\"block block-block-content block-block-content6c2d4b45-4dba-4b2d-8b9f-76701bf27533 clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<ul class=\"fa-ul\">\n<li><i class=\"fa-li fa fa-phone\"></i>+44 (0)1223 811679</li>\n<li><i class=\"fa-li fa fa-envelope\"></i><a href=\"denied:mailto:info@aleph1.co.uk?Subject=Website contact\" target=\"_top\">info@aleph1.co.uk</a></li>\n</ul>\n</div>\n      \n  </section>\n\n\n  </div>\n\n            </div>\n            <div class=\"col-sm-3\">\n                \n            </div>\n            <div class=\"col-sm-3\">\n                \n            </div>\n            <div class=\"col-sm-3\">\n                  <div class=\"region region-footer-col4\">\n    <section id=\"block-footerlegal\" class=\"block block-block-content block-block-content78ab593d-35b6-4772-a141-30216e7fcbb2 clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<p class=\"text-align-right\">&nbsp;<a href=\"/legal\">Legal &amp; Cookies</a></p>\n</div>\n      \n  </section>\n\n<section id=\"block-cookieinfo\" class=\"block block-block-content block-block-content4848c58d-90df-4819-81d8-0f9568eeeaac clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<p class=\"text-align-justify\"><br />\nWe use <a href=\"/legal\">cookies on this site</a>. 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data-drupal-link-system-path=\"documents\">Documents</a>\n                  </li>\n                        <li>\n        <a href=\"/get-yaffs\" data-drupal-link-system-path=\"node/382\">Download</a>\n                  </li>\n                        <li>\n        <a href=\"/about-us\" data-drupal-link-system-path=\"node/325\">About us</a>\n                  </li>\n                        <li>\n        <a href=\"/contact\" data-drupal-link-system-path=\"node/73\">Contact</a>\n                  </li>\n        </ul>\n  \n\n\n  </nav>\n<div class=\"search-block-form block block-search block-search-form-block\" data-drupal-selector=\"search-block-form\" id=\"block-searchform\" role=\"search\">\n  \n    \n      <form action=\"/search/node\" method=\"get\" id=\"search-block-form\" accept-charset=\"UTF-8\">\n  <div class=\"form-item js-form-item form-type-search js-form-type-search form-item-keys js-form-item-keys form-no-label form-group\">\n      <label for=\"edit-keys\" class=\"control-label 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