{"id":1028,"date":"2022-03-19T10:41:50","date_gmt":"2022-03-19T02:41:50","guid":{"rendered":"https:\/\/www.zhiwanyuzhou.com\/?p=1028"},"modified":"2022-12-03T14:01:33","modified_gmt":"2022-12-03T06:01:33","slug":"jffs2%e6%96%87%e4%bb%b6%e7%b3%bb%e7%bb%9f","status":"publish","type":"post","link":"https:\/\/www.zhiwanyuzhou.com\/index.php\/2022\/03\/19\/jffs2%e6%96%87%e4%bb%b6%e7%b3%bb%e7%bb%9f\/","title":{"rendered":"JFFS2\u6587\u4ef6\u7cfb\u7edf"},"content":{"rendered":"\n

JFFS2\u7684\u5168\u540d\u4e3aJournallingFlashFileSystemVersion2\uff08\u95ea\u5b58\u65e5\u5fd7\u578b\u6587\u4ef6\u7cfb\u7edf\u7b2c2\u7248\uff09\uff0c\u5176\u529f\u80fd\u5c31\u662f\u7ba1\u7406\u5728MTD\u8bbe\u5907\u4e0a\u5b9e\u73b0\u7684\u65e5\u5fd7\u578b\u6587\u4ef6\u7cfb\u7edf\u3002\u4e0e\u5176\u4ed6\u7684\u5b58\u50a8\u8bbe\u5907\u5b58\u50a8\u65b9\u6848\u76f8\u6bd4\uff0cJFFS2\u5e76\u4e0d\u51c6\u5907\u63d0\u4f9b\u8ba9\u4f20\u7edf\u6587\u4ef6\u7cfb\u7edf\u4e5f\u53ef\u4ee5\u4f7f\u7528\u6b64\u7c7b\u8bbe\u5907\u7684\u8f6c\u6362\u5c42\u3002\u5b83\u53ea\u4f1a\u76f4\u63a5\u5728MTD\u8bbe\u5907\u4e0a\u5b9e\u73b0\u65e5\u5fd7\u7ed3\u6784\u7684\u6587\u4ef6\u7cfb\u7edf\u3002JFFS2\u4f1a\u5728\u5b89\u88c5\u7684\u65f6\u5019\uff0c\u626b\u63cfMTD\u8bbe\u5907\u7684\u65e5\u5fd7\u5185\u5bb9\uff0c\u5e76\u5728RAM\u4e2d\u91cd\u65b0\u5efa\u7acb\u6587\u4ef6\u7cfb\u7edf\u7ed3\u6784\u672c\u8eab\u3002
\u9664\u4e86\u63d0\u4f9b\u5177\u6709\u65ad\u7535\u53ef\u9760\u6027\u7684\u65e5\u5fd7\u7ed3\u6784\u6587\u4ef6\u7cfb\u7edf\uff0cJFFS2\u8fd8\u4f1a\u5728\u5b83\u7ba1\u7406\u7684MTD\u8bbe\u5907\u4e0a\u5b9e\u73b0\u201c\u635f\u8017\u5e73\u8861\u201d\u548c\u201c\u6570\u636e\u538b\u7f29\u201d\u7b49\u7279\u6027\u3002<\/p>\n\n\n\n

\u4e3a\u4e86\u66f4\u597d\u7684\u4e86\u89e3JFFS2\u6587\u4ef6\u7cfb\u7edf\uff0c\u6211\u4eec\u9996\u5148\u6765\u521b\u5efa\u4e00\u4e2a\u76ee\u5f55rootfs\uff0c\u91cc\u9762\u5305\u542b\u4e00\u4e9b\u76ee\u5f55\u548c\u4e00\u4e9b\u6587\u4ef6\uff0c\u5176\u4e2d001\u6587\u4ef6\u5185\u5bb9\u4e3a111\uff0c\u6700\u7ec8\u6253\u5305\u4e3a\u4e00\u4e2aJFFS2\u6587\u4ef6\u7cfb\u7edf\u6620\u50cf\u3002<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

\u547d\u4ee4\u5982\u4e0b\uff1a<\/p>\n\n\n\n

mkfs.jffs2 -r rootfs -o rootfs.jffs2<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u4f7f\u752816\u8fdb\u5236\u5de5\u5177\u67e5\u770brootfs.jffs2\u6587\u4ef6\uff1a<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

\u89e3\u6790\u8fc7\u7a0b<\/p>\n\n\n\n

\u5e8f\u53f7<\/td>\u504f\u79fb<\/td>\u8bf4\u660e<\/td><\/tr>
1<\/td>0x00-0x01<\/td>magic\uff0c\u503c\u4e3a0x1985<\/td><\/tr>
2<\/td>0x02-0x03<\/td>node_type\uff0c\u503c\u4e3a0x2003<\/td><\/tr>
3<\/td>0x04-0x07<\/td>totlen\uff0c\u503c\u4e3a0x0C<\/td><\/tr>
4<\/td>0x08-0x0B<\/td>hdr_crc\uff0c\u503c\u4e3a0xE41EB0B1\uff0c\u5373\u8ba1\u7b970-7\u5b57\u8282\u7684crc<\/td><\/tr>
5<\/td>0x0C-0x0D<\/td>magic\uff0c\u503c\u4e3a0x1985<\/td><\/tr>
6<\/td>0x0E-0x0F<\/td>node_type\uff0c\u503c\u4e3a0xE001\uff0c\u5b9a\u4e49\u4e3ajffs2_raw_dirent<\/td><\/tr>
7<\/td>0x10-0x13<\/td>totlen\uff0c\u503c\u4e3a0x2B<\/td><\/tr>
8<\/td>0x14-0x17<\/td>hdr_crc\uff0c\u503c\u4e3a0x7D266EE6<\/td><\/tr>
9<\/td>0x18-0x1B<\/td>pino\uff0c\u503c\u4e3a0x01<\/td><\/tr>
10<\/td>0x1C-0x1F<\/td>version\uff0c\u503c\u4e3a0x00<\/td><\/tr>
11<\/td>0x20-0x23<\/td>ino\uff0c\u503c\u4e3a0x02<\/td><\/tr>
12<\/td>0x24-0x27<\/td>mctime \u521b\u5efa\u65f6\u95f4\uff0c\u503c\u4e3a0x6235256d\uff0c\u5373\u8ba1\u7b970x0C-0x13\u5b57\u8282\u7684crc<\/td><\/tr>
13<\/td>0x28<\/td>nsize\uff0c\u503c\u4e3a0x03<\/td><\/tr>
14<\/td>0x29<\/td>type\uff0c\u503c\u4e3a0x08<\/td><\/tr>
15<\/td>0x2A-0x2B<\/td>\u4fdd\u7559\u6570\u636e<\/td><\/tr>
16<\/td>0x2C-0x2F<\/td>node_crc\uff0c\u503c\u4e3a0xF4D44AED<\/td><\/tr>
17<\/td>0x30-0x33<\/td>name_crc\uff0c\u503c\u4e3a0xAAF3D359<\/td><\/tr>
18<\/td>0x34-0x37<\/td>name\uff0c\u5b57\u7b26\u4e32\u4e3a001\uff0c\u4e3a\u4e86\u5076\u6570\u5bf9\u9f50\uff0c\u4ee50xFF\u5bf9\u9f50<\/td><\/tr>
19<\/td>0x38-0x39<\/td>magic\uff0c\u503c\u4e3a0x1985<\/td><\/tr>
20<\/td>0x3A-0x3B<\/td>node_type\uff0c\u503c\u4e3a0xE002\uff0c\u5b9a\u4e49\u4e3ajffs2_raw_inode<\/td><\/tr>
21<\/td>0x3C-0x3F<\/td>totlen\uff0c\u503c\u4e3a0x48<\/td><\/tr>
22<\/td>0x40-0x43<\/td>hdr_crc\uff0c\u503c\u4e3a0xd22144a5<\/td><\/tr>
23<\/td>0x44-0x47<\/td>ino\uff0c\u503c\u4e3a0x02<\/td><\/tr>
24<\/td>0x48-0x4B<\/td>version\uff0c\u503c\u4e3a0x01<\/td><\/tr>
25<\/td>0x4C-0x4F<\/td>mode\uff0c\u503c\u4e3a0x81b4<\/td><\/tr>
26<\/td>0x50-0x51<\/td>uid\uff0c\u503c\u4e3a0x03E9\uff081001\uff09<\/td><\/tr>
27<\/td>0x52-0x53<\/td>gid\uff0c\u503c\u4e3a0x03E9\uff081001\uff09<\/td><\/tr>
28<\/td>0x54-0x57<\/td>isize\uff0c\u503c\u4e3a0x04<\/td><\/tr>
29<\/td>0x58-0x5B<\/td>atime \u8bbf\u95ee\u65f6\u95f4\uff0c\u503c\u4e3a0x6235256d<\/td><\/tr>
30<\/td>0x5C-0x5F<\/td>mtime \u6700\u540e\u4e00\u6b21\u4fee\u6539\u65f6\u95f4\uff0c\u503c\u4e3a0x6235256d<\/td><\/tr>
31<\/td>0x60-0x63<\/td>ctime \u4fee\u6539\u65f6\u95f4\uff0c\u503c\u4e3a0x6235256d<\/td><\/tr>
32<\/td>0x64-0x67<\/td>offset\uff0c\u503c\u4e3a0x00<\/td><\/tr>
33<\/td>0x68-0x6B<\/td>csize \uff08\u538b\u7f29\uff09\u6570\u636e\u5927\u5c0f\uff0c\u503c\u4e3a0x04<\/td><\/tr>
34<\/td>0x6C-0x6F<\/td>dsize \uff08\u89e3\u538b\u540e\uff09\u6570\u636e\u5927\u5c0f\uff0c\u503c\u4e3a0x04<\/td><\/tr>
35<\/td>0x70<\/td>compr\uff0c\u503c\u4e3a0x00\uff0c\u5373\u538b\u7f29\u65b9\u5f0f\u4e3a\u4e0d\u538b\u7f29<\/td><\/tr>
36<\/td>0x71<\/td>usercompr\uff0c\u503c\u4e3a0x00<\/td><\/tr>
37<\/td>0x72-0x73<\/td>flags\uff0c\u503c\u4e3a0x00<\/td><\/tr>
38<\/td>0x74-0x77<\/td>data_crc \u6570\u636ecrc\uff0c\u503c\u4e3a0x4bb6fecf<\/td><\/tr>
39<\/td>0x78-0x7B<\/td>node_crc\uff0c\u503c\u4e3a0x4d839ca6<\/td><\/tr>
40<\/td>0x7C-0x7F<\/td>data\uff0c\u6570\u636e\u4e3a\\x31\\x31\\x31\\x0A<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u538b\u7f29\u65b9\u5f0f\u5b9a\u4e49\u5982\u4e0b<\/p>\n\n\n\n

\u5e8f\u53f7<\/td>\u503c<\/td>\u5b9a\u4e49<\/td><\/tr>
1<\/td>0x00<\/td>JFFS2_COMPR_NONE<\/td><\/tr>
2<\/td>0x01<\/td>JFFS2_COMPR_ZERO<\/td><\/tr>
3<\/td>0x02<\/td>JFFS2_COMPR_RTIME<\/td><\/tr>
4<\/td>0x03<\/td>JFFS2_COMPR_RUBINMIPS<\/td><\/tr>
5<\/td>0x04<\/td>JFFS2_COMPR_COPY<\/td><\/tr>
6<\/td>0x05<\/td>JFFS2_COMPR_DYNRUBIN<\/td><\/tr>
7<\/td>0x06<\/td>JFFS2_COMPR_ZLIB<\/td><\/tr>
8<\/td>0x07<\/td>JFFS2_COMPR_LZO<\/td><\/tr>
9<\/td>0x08<\/td>JFFS2_COMPR_LZMA<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u6821\u9a8c\u7b97\u6cd5\uff08python\u5b9e\u73b0\uff09\uff1a<\/p>\n\n\n\n

import binascii\n\ndef mtd_crc(data):\n    return (binascii.crc32(data, -1) ^ -1) & 0xFFFFFFFF<\/code><\/pre>\n\n\n\n
\u53c2\u8003\u94fe\u63a5\uff1a<\/p>\n\n\n\n
https:\/\/www.zhiwanyuzhou.com\/download\/Datasheet\/rootfs\/jffs2.pdf<\/a><\/p>\n\n\n\n
https:\/\/github.com\/sviehb\/jefferson<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
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