After a hard drive I/O failue and an attempt at fsck recovery on an ext4 partition, I've got a disk where the numbers of used inode is vastly different according to 'df -i' and according to 'find . | wc -l':[yan@machine ~]$ ls -di /run/media/yan/data2 /run/media/yan/data[yan@machine ~]$ lsblk -o NAME,FSTYPE,LABEL,TYPE,SIZE,MOUNTPOINTNAME   FSTYPE LABEL         TYPE   SIZE MOUNTPOINT...sdc                         disk   1.8T sdc1 vfat   clonezilla    part   512M sdc2 ext4   live_system   part  14.7G sdc3 ext4   system_images part 244.1G sdc4 ext4   data          part 781.3G /run/media/yan/datasdc5 ext4   rec           part 822.5G [yan@machine data]$ df -i /run/media/yan/data/Filesystem       Inodes IUsed    IFree IUse% Mounted on/dev/sdc4      51200000 74199 51125801    1% /run/media/yan/data[yan@machine data]$ sudo find /run/media/yan/data | wc -l23690So it seems I have a lot of unconnected inodes, despite fsck telling me partition is clean (even with -f). I'd like to know where the (74199-23690) missing inodes are. I know there are still on the disk because I've managed to get back 50k files using photorec.So I've try to use debugfs, but I can't find anywhere in the manual a way to dump the list of allocated inodes. (And most post online use find/ls -i to list inodes, which won't work in my case).Does any one know a way to get the list of inodes used according to df/fsck ?For now, I'm considering to inefficiently bruteforce with something along the lines of :for i in `seq 1 $NMAX`; do debugfs -R 'ncheck $i' | grep $i; done > inodelistwith NMAX big enough, but there is surely more efficient way, no ?EDIT :I think I have found a possible way. dumpe2fs list all blocks and free inodes for each block. From it, it should be possible to deduce used inodes. I still have to compute the list of non-free inodes and see if it seems (at least count-wise) to be what I want. From the list, I found some weird inodes apparently connected between themselves, but not to the root :debugfs:  pwd[pwd]   INODE: 45220182  PATH: .../dir1/dir2/dir3/dir4[root]  INODE:      2  PATH: /debugfs:  cd ..debugfs:  pwd[pwd]   INODE: 44957702  PATH: .../dir4/dir1/dir2/dir3[root]  INODE:      2  PATH: /
How to dump the list of used inodes on a ext4 filesystem by using debugfs?
ext4;inode;debugfs