Ceph » CephFS

We are planning to add a quota.max_files limit for each subvolume. (Some malicious user creates tons of file, so this issue triggered a performance degradation in our service.)

While checking the quota feature, I confirmed the cp (or mv) command from the local filesystem to cephfs can copy far more files than the quota.max_files value to the subvolume.

I think a logic to check the dir.rstat is essential when creating a new inode.

$ getfattr -n ceph.quota.max_files /_vsfs_managed/a14c8a8d-4c9a-4da5-b22d-222c8eea2d04 --absolute-name
# file: /_vsfs_managed/a14c8a8d-4c9a-4da5-b22d-222c8eea2d04
ceph.quota.max_files="8" 

[quota_mv]$ sudo cp -R ~/dir_local_1/ ./

[quota_mv]$ tree | wc -l
2440