superblock定义： http://linfo.org/superblock
e2fsck -v -y -f /dev/vda3
https://olinux.net/e2fsck/
e2fsprogs.sourceforge.net
checkalinuxext2/ext3/ext4 filesystemforext3andext4filesystemsthatuseajournal，ifthesystemhasbeenshutdownuncleanlywithoutanal afterreplayingthecommittedtransactionsinthejournal，thefilesystemshouldbemarkedasclean.hence，forfilesystemsthatusejournalal E2 fsckwillnormallyreplaythejournalandexit，unlessitssuperblockindicatesthatfurthercheckingisrequired。
dviceisablockdevice(e.g . /dev/sdc1 ) orfilecontainingthefilesystem.notethatingeneralitisnotsafetorune2fsckonmountedfilesystems.theonlyexceptionionion and -c，-l，or-loptionsarenotspecified.however，even if it is safe to do so， theresultsprintedbye2fsckarenotvalidifthefilesystemismounted.ife2fsckaskswhetherornotyoushouldcheckarenotvalidiftemwhismounted the only correct answer is ` ` no ' '.onlyexpertswhoreallyknowwhattheyaredoingshouldconsideransweringthisquestioninanyotherway.ife2fsckisrunininiteractive or -p are specified )，theprogramwillasktheusertofixeachproblemfoundinthefilesystem.aresponseoonse ' n ' will leave the error unse and ' a ' willfixtheproblemandallsubsequentproblems； pressingenterwillproceedwithedefaultresponse，whichisprintedbeforethequestionmark.pressing控制- c terminates e2fsck imemmer
- v verbose模式。
- yassumeananswerof ` yes ' toallquestions； allowse2fscktobeusednon-interactively.thisoptionmaynotbespecifiedatthesametimeasthe-nor-p选项。
错误分析： bad幻灯片编号中的super-block根据分区中划分的块数查找幻灯片编号，发现幻灯片编号错误。
monjan 250733602:20 utc 2021: execute : e2fsck-v-y-f/dev/VDA3e2fsck1.44.6(5-mar-2019 ) () ) ) ) ) ext2fs _ open 2: badmagicnumberinsuper-block e2fsck 3360 tryingbackupblocks . e2fsck : badmagicnumberinsuper-blockwhiletryingtoopen/dev/VD a3 thesuperblockcouldnotbereadordordoesnsupen ext 4文件系统. ifthedeviceisvalidanditreallycontainsanextem.ifthedeviceisvalidanditreallycontainsanextem ext3/ext 4文件系统(andnotswaporufsorsomethingelse )、then the superblockis corrupt， andyoumighttryrunninge2fsckwithanalternatesuperblock : e2fsck-b 8193设备or e2fsck-b 32768设备/dev/VD a3 containsaxfsfilesystemlabelled '2app1@ LCP-ba ' EC ext2_ et _ bad _ magic， ' badmagicnumberinsuper-block '/* * thesecondextendedfilesystemmagicnumber */# define ext2_ super _ magic0x ef53//lief goto cleanup； }
# fdisk-lmanipulatediskpartitiontabledisk/dev/vda :37.3 gib，40000000000 bytes， 7125000 sectors units : sectors of1* 512=512 bytessectorsize (logical/physical ) 3360512bytes/512bytesi/osize ) minical osize 3360512 bytes/512 bytesdisklabeltype : dosdiskidentifier 33600 x 768 ba 831 devicebootstartendsectorssizeidtype/dev/vda 1 2048167721516775168 g83 Linux/dev/vda 21677721627262975104857605 g83 Linux/dev/vda 327262976293601272097152 g83 Linux disk/vda 327262976293601272097152 vdb : 37.3 gib，40000000000 bytes， 7125000 sectors units : sectors of1* 512=512 bytessectorsize (logical/physical ) 3360512bytes/512bytesi/osize ) minical osize 3360512 bytes/512 bytesdisk/dev/VDC :7.5 gib，8000000000 bytes， 15625000 sectors units : sectors of1* 512=512 bytessectorsize (logical/physical ) 3360512bytes/512bytesi/osize ) mini vdd:63.3GIB，68000000000 bytes，132812500 sectors units : sectors of1* 512=512 bytessectorsize (逻辑/物理) 33332