\n\t    \u6298\u817e\u4e86Linux\u8fd9\u4e48\u4e45\uff0c\u5bf9\u78c1\u76d8\u5b58\u50a8\u4e5f\u5403\u4e86\u4e0d\u5c11\u4e8f\uff0c\u73b0\u5728\u603b\u7ed3\u70b9Linux\u6587\u4ef6\u7cfb\u7edf\u65b9\u9762\u7684\u4e1c\u897f\u3002<\/span><\/span>\n<\/p>\n

\n\t \n<\/p>\n

\n\t\u4e00\u3001\u786c\u4ef6\u5c42\u9762<\/span><\/span>\n<\/p>\n

\n\t \n<\/p>\n

\n\t    \u4e00\u4e2a\u771f\u5b9e\u7684\u673a\u68b0\u786c\u76d8\u7269\u7406\u7ed3\u6784\u5927\u81f4\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/span><\/span>\n<\/p>\n

\n\t \n<\/p>\n

\n\t<\/a><\/span><\/span>\n<\/p>\n

\n\t\u5176\u4e2d\u78c1\u5934\u548c\u76d8\u7247\u4e4b\u95f4\u7684\u8ddd\u79bb\u662f\u5fae\u7c73\u6570\u91cf\u7ea7\uff0c\u4e14\u78c1\u76d8\u5185\u90e8\u662f\u771f\u7a7a\u5c01\u95ed\u7684\uff0c\u4e00\u65e6\u6709\u7a7a\u6c14\u8fdb\u5165\uff0c\u786c\u76d8\u5f88\u5bb9\u6613\u6545\u969c\u3002<\/span><\/span>\n<\/p>\n

\n\t\u5bf9\u78c1\u76d8\u76d8\u7247\u4e0a\u7684\u62bd\u8c61\u56fe\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/span><\/span>\n<\/p>\n

\n\t \n<\/p>\n

\n\t <\/a><\/span><\/span>\n<\/p>\n

\n\t \n<\/p>\n

\n\t\u5728\u78c1\u76d8\u76d8\u7247\u4e0a\u4e3b\u8981\u6709\u4e09\u90e8\u5206\u5212\u5206\uff1a<\/span><\/span>\n<\/p>\n

\n\t    track\uff1a\u78c1\u9053\uff0c\u4ee5\u8f6c\u8f74\u4e3a\u4e2d\u5fc3\uff0c\u5212\u5206\u4e86\u8bb8\u591a\u540c\u5fc3\u5706\uff0c\u6bcf\u4e2a\u5706\u547d\u540d\u4e3a\u4e00\u4e2a\u78c1\u9053\uff0c\u7c7b\u4f3c\u4f53\u80b2\u573a\u4e0a\u7684\u8dd1\u9053<\/span><\/span>\n<\/p>\n

\n\t    sector\uff1a\u6247\u533a\uff0c\u76f8\u90bb\u4e24\u4e2a\u78c1\u9053\u4e4b\u95f4\u7684\u533a\u57df\uff0c\u53c8\u88ab\u5212\u5206\u8bb8\u591a\u533a\u57df\uff0c\u53eb\u505a\u6247\u533a<\/span><\/span>\n<\/p>\n

\n\t    cynlinder\uff1a\u67f1\u9762\uff0c\u5bf9\u4e8e\u591a\u76d8\u7247\u7684\u786c\u76d8\u6765\u8bf4\uff0c\u7531\u4e8e\u81c2\u6746\u548c\u78c1\u5934\u56fa\u5b9a\uff0c\u4e3a\u4e86\u5206\u533a\u65b9\u4fbf\uff0c\u5f15\u5165\u67f1\u9762\u6982\u5ff5\uff0c\u4e00\u4e2a\u5206\u533a\u7684\u5f00\u59cb\u548c\u7ed3\u675f\u90fd\u4ee5\u67f1\u9762\u8fdb\u884c\u6807\u8bc6<\/span><\/span>\n<\/p>\n

\n\t \n<\/p>\n

\n\t\u4e8c\u3001\u8f6f\u4ef6\u5c42\u9762<\/span><\/span>\n<\/p>\n

\n\t\u5178\u578b\u7684ext \u6587\u4ef6\u7cfb\u7edf\u5728\u683c\u5f0f\u5316\u7684\u65f6\u5019\u57fa\u672c\u4e0a\u4f1a\u5212\u5206\u4e3a\u591a\u4e2a\u5757\u7ec4\uff08Block Group\uff09\u7684\uff0c\u6bcf\u4e2a\u5757\u7ec4\u90fd\u6709\u72ec\u7acb\u7684 inode\/block\/super block \u7cfb\u7edf\uff0c\u6574\u4f53\u5c55\u793a\u56fe\u5982\u4e0b\uff0c<\/span><\/span>\n<\/p>\n

\n\t \n<\/p>\n

\n\t<\/a><\/span><\/span>\n<\/p>\n

\n\t\u5176\u4e2d\u5404\u5757\u7684\u542b\u4e49\u5982\u4e0b\uff1a<\/span><\/span>\n<\/p>\n

\n\tMBR\uff1amaster boot record,\u786c\u76d8\u7684\u4e3b\u5f15\u5bfc\u8bb0\u5f55\uff0c\u524d446\u5b57\u8282\u5b58\u653e\u4e3b\u5f15\u5bfc\u7a0b\u5e8f\uff0c\u4e2d\u95f464\u5b57\u8282\u5b58\u653e\u5206\u533a\u8868\u4fe1\u606f\uff08\u4e3b\u5206\u533a+\u6269\u5c55\u5206\u533a<=4\uff09\uff0c\u6700\u540e2\u4e2a\u5b57\u8282\u662f\u7ed3\u675f\u6807\u5fd7\u4f4d\u3002<\/span><\/span>\n<\/p>\n

\n\tSuper Block\uff1a\u8bb0\u5f55\u6b64\u6587\u4ef6\u7cfb\u7edf\u7684\u6574\u4f53\u7cfb\u7edf\uff0c\u5305\u62ec inode \u548c block \u7684\u603b\u91cf\u3001\u4f7f\u7528\u91cf\u3001\u5269\u4f59\u91cf\uff0c\u4ee5\u53ca\u6587\u4ef6\u7cfb\u7edf\u7c7b\u578b\u7b49\u3002<\/span><\/span>\n<\/p>\n

\n\tGroup Descriptor Table\uff1a\u6587\u4ef6\u7cfb\u7edf\u63cf\u8ff0\u8bf4\u660e\uff0c\u63cf\u8ff0\u6bcf\u4e2a block group \u7684\u5f00\u59cb\u4e0e\u7ed3\u675f\u7684 block \u53f7\u7801\u3002<\/span><\/span>\n<\/p>\n

\n\tBlock Bitmap\uff1a\u5757\u5bf9\u7167\u8868\uff0c\u7528\u6765\u5feb\u901f\u5bfb\u627e\u53ef\u7528\u7684 block \u5757\u3002<\/span><\/span>\n<\/p>\n

\n\tInode Bitmap\uff1ainode\u5bf9\u7167\u8868\uff0c\u7528\u6765\u5feb\u901f\u5bfb\u627e\u53ef\u7528\u7684 inode \u5757\u3002<\/span><\/span>\n<\/p>\n

\n\tInode Table\uff1a\u5b58\u653e inode \u5757\u7684\u5730\u65b9\u3002\u5b83\u4eec\u662f\u6587\u4ef6\u7cfb\u7edf\u7684\u5173\u952e\u3002\u8bb0\u5f55\u4e86\u6587\u4ef6\u7684\u5c5e\u6027\uff0c\u4e00\u4e2a\u6587\u4ef6\u5360\u7528\u4e00\u4e2a inode\uff0c\u540c\u65f6\u5305\u542b\u591a\u4e2a\u6307\u9488\uff0c\u6307\u5411\u4e86\u5c5e\u4e8e\u8be5\u6587\u4ef6\u7684\u5404\u4e2a data block \u5757\u3002<\/span><\/span>\n<\/p>\n

\n\tData Block\uff1a\u771f\u6b63\u5b58\u653e\u6570\u636e\u7684\u5730\u65b9\u3002\u6587\u4ef6\u592a\u5927\u4f1a\u5360\u7528\u591a\u4e2a block \u3002<\/span><\/span>\n<\/p>\n

\n\t \n<\/p>\n

\n\t\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528dumpe2fs\u67e5\u770bsuperblock\u548c\u6bcf\u4e2a\u533a\u5757\u7ec4\u7684\u4fe1\u606f\uff1a<\/span><\/span>\n<\/p>\n

\n\t \n<\/p>\n

\n\t[root@S5 ~]# dumpe2fs \/dev\/sda2<\/span><\/span>\n<\/p>\n

\n\tdumpe2fs 1.41.12 (17-May-2010)<\/span><\/span>\n<\/p>\n

\n\tFilesystem volume name:   <none><\/span><\/span>\n<\/p>\n

\n\tLast mounted on:          <not available><\/span><\/span>\n<\/p>\n

\n\tFilesystem UUID:          d50a6d8f-ae89-498b-93bb-abf17f9bf4fd<\/span><\/span>\n<\/p>\n

\n\tFilesystem magic number:  0xEF53<\/span><\/span>\n<\/p>\n

\n\tFilesystem revision #:    1 (dynamic)<\/span><\/span>\n<\/p>\n

\n\tFilesystem features:      has_journal ext_attr resize_inode dir_index filetype needs_recovery sparse_super large_file<\/span><\/span>\n<\/p>\n

\n\tFilesystem flags:         signed_directory_hash<\/span><\/span>\n<\/p>\n

\n\tDefault mount options:    user_xattr acl<\/span><\/span>\n<\/p>\n

\n\tFilesystem state:         clean<\/span><\/span>\n<\/p>\n

\n\tErrors behavior:          Continue<\/span><\/span>\n<\/p>\n

\n\tFilesystem OS type:       Linux<\/span><\/span>\n<\/p>\n

\n\tInode count:              1310720<\/span><\/span>\n<\/p>\n

\n\tBlock count:              5242880<\/span><\/span>\n<\/p>\n

\n\tReserved block count:     262144<\/span><\/span>\n<\/p>\n

\n\tFree blocks:              2250122<\/span><\/span>\n<\/p>\n

\n\tFree inodes:              1075111<\/span><\/span>\n<\/p>\n

\n\tFirst block:              0<\/span><\/span>\n<\/p>\n

\n\tBlock size:               4096<\/span><\/span>\n<\/p>\n

\n\tFragment size:            4096<\/span><\/span>\n<\/p>\n

\n\tReserved GDT blocks:      1022<\/span><\/span>\n<\/p>\n

\n\tBlocks per group:         32768<\/span><\/span>\n<\/p>\n

\n\tFragments per group:      32768<\/span><\/span>\n<\/p>\n

\n\tInodes per group:         8192<\/span><\/span>\n<\/p>\n

\n\tInode blocks per group:   512<\/span><\/span>\n<\/p>\n

\n\tFilesystem created:       Thu Mar 19 12:24:26 2015<\/span><\/span>\n<\/p>\n

\n\tLast mount time:          Thu Jun 23 07:14:38 2016<\/span><\/span>\n<\/p>\n

\n\tLast write time:          Mon Jun 13 22:33:27 2016<\/span><\/span>\n<\/p>\n

\n\tMount count:              833<\/span><\/span>\n<\/p>\n

\n\tMaximum mount count:      -1<\/span><\/span>\n<\/p>\n

\n\tLast checked:             Thu Mar 19 12:24:26 2015<\/span><\/span>\n<\/p>\n

\n\tCheck interval:           0 (<none>)<\/span><\/span>\n<\/p>\n

\n\tLifetime writes:          2312 kB<\/span><\/span>\n<\/p>\n

\n\tReserved blocks uid:      0 (user root)<\/span><\/span>\n<\/p>\n

\n\tReserved blocks gid:      0 (group root)<\/span><\/span>\n<\/p>\n

\n\tFirst inode:              11<\/span><\/span>\n<\/p>\n

\n\tInode size:              256<\/span><\/span>\n<\/p>\n

\n\tRequired extra isize:     28<\/span><\/span>\n<\/p>\n

\n\tDesired extra isize:      28<\/span><\/span>\n<\/p>\n

\n\tJournal inode:            8<\/span><\/span>\n<\/p>\n

\n\tFirst orphan inode:       172059<\/span><\/span>\n<\/p>\n

\n\tDefault directory hash:   half_md4<\/span><\/span>\n<\/p>\n

\n\tDirectory Hash Seed:      191ce352-9cd6-4d24-9773-2908302b1a32<\/span><\/span>\n<\/p>\n

\n\tJournal backup:           inode blocks<\/span><\/span>\n<\/p>\n

\n\tJournal features:         journal_incompat_revoke<\/span><\/span>\n<\/p>\n

\n\tJournal size:             128M<\/span><\/span>\n<\/p>\n

\n\tJournal length:           32768<\/span><\/span>\n<\/p>\n

\n\tJournal sequence:         0x000a2dac<\/span><\/span>\n<\/p>\n

\n\tJournal start:            1<\/span><\/span>\n<\/p>\n

\n\tGroup 0: (Blocks 0-32767)<\/span><\/span>\n<\/p>\n

\n\t.............<\/span><\/span>\n<\/p>\n

\n\t.............<\/span><\/span>\n<\/p>\n

\n\t.............<\/span><\/span>\n<\/p>\n

\n\tBlock bitmap at 327680 (+0), Inode bitmap at 327681 (+1)<\/span><\/span>\n<\/p>\n

\n\t  Inode table at 327682-328193 (+2)<\/span><\/span>\n<\/p>\n

\n\t  200 free blocks, 4663 free inodes, 287 directories<\/span><\/span>\n<\/p>\n

\n\t  Free blocks: 328195-328199, 331776-331880, 331882-331919, 336568-336576, 339968-339971, 344064-344072, 344196-344225<\/span><\/span>\n<\/p>\n

\n\t  Free inodes: 82425-82430, 85226, 85395, 85457-85542, 85544-90112<\/span><\/span>\n<\/p>\n

\n\tGroup 11: (Blocks 360448-393215)<\/span><\/span>\n<\/p>\n

\n\t  Block bitmap at 360448 (+0), Inode bitmap at 360449 (+1)<\/span><\/span>\n<\/p>\n

\n\t  Inode table at 360450-360961 (+2)<\/span><\/span>\n<\/p>\n

\n\t  0 free blocks, 4713 free inodes, 671 directories<\/span><\/span>\n<\/p>\n

\n\t..............<\/span><\/span>\n<\/p>\n

\n\t \n<\/p>\n

\n\t \n<\/p>\n

\n\t\u5f15\u7528\u4f4d\u7f6e\uff1a<\/span><\/span>\n<\/p>\n

\n\thttp:\/\/wuchong.me\/blog\/2014\/07\/19\/linux-file-system\/<\/a><\/span><\/span>\n<\/p>\n

\n\thttp:\/\/www.ibm.com\/developerworks\/linux\/library\/l-linux-filesystem\/?S_TACT=105AGX52&S_CMP=cn-a-l<\/a><\/span><\/span>\n<\/p>\n

\n\t\u9a6c\u54e5Linux\u8fd0\u7ef4\u89c6\u989101-\u78c1\u76d8\u6587\u4ef6\u7cfb\u7edf\u7ba1\u7406<\/span><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

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