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One option is to recreate your filesystem specifying bytes-to-inode ratio with -i option.

1. Backup all of your data to another disk.

2. List your filesystems and find the one you want to modify:

   $ df -h

   assuming that filesystem is /dev/sdX and is mounted on /mnt/mountpoint.

3. Unmount that filesystem:

   $ umount /mnt/mountpoint

4. Create that filesystem using mkfs.ext4 command specifying -i byte-to-inode ratio:

   $ mkfs.ext4 -i 4096 /dev/sdX

   This command will create ext4 filesystem with 4 KB per inode ratio (which will create four times more inodes than the default value - 16 KB per inode).

5. Mount that filesystem:

   $ mount /dev/sdX /mnt/mountpoint

6. Reboot to apply previous permissions.