[cut down CC list, since I don't think most people care about this detail] On Sep 23, 2020, at 3:44 AM, Jan Kara <jack@xxxxxxx> wrote: > > On Wed 23-09-20 05:20:55, Mikulas Patocka wrote: >> There seems to be a bug in ext4 - when I create very large directory, ext4 >> fails with -ENOSPC despite the fact that there is plenty of free space and >> free inodes on the filesystem. >> >> How to reproduce: >> download the program dir-test: >> http://people.redhat.com/~mpatocka/benchmarks/dir-test.c >> >> # modprobe brd rd_size=67108864 >> # mkfs.ext4 /dev/ram0 >> # mount -t ext4 /dev/ram0 /mnt/test >> # dir-test /mnt/test/ 8000000 8000000 >> deleting: 7999000 >> 2540000 >> file 2515327 can't be created: No space left on device >> # df /mnt/test >> /dev/ram0 65531436 633752 61525860 2% /mnt/test >> # df -i /mnt/test >> /dev/ram0 4194304 1881547 2312757 45% /mnt/test > > Yeah, you likely run out of space in ext4 directory h-tree. You can enable > higher depth h-trees with large_dir feature (mkfs.ext4 -O large_dir). Does > that help? You can also enable this feature on an existing filesystem by running "tune2fs -O large_dir /dev/sdX". It might need to be unmounted, not sure. Cheers, Andreas
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