Hello folks, Recently I'm trying to implement a feature on overlayfs for our users. I'd like to call it "quota-df" which means when calling statfs(2), override/update some fields(e.g., total/used/avail of both block/inode counts） using proper project quota information if the quota has already set to underlying directories of overlayfs. This feature is probably useful for most of container users and there is no serious side effect to the other parts. We can also provide a new mount option to enable/disable the function according to different use cases. Although I'm still working on it but I'll post the RFC patch here for review in recent days and hope to get some feedback from you. Any kind of suggestions are welcomed. Here are some test examples share with you (based on ext4): 1) project quota enabled && without hard-limit $ df -h /mnt/test3 /mnt/test3/df/merged Filesystem Size Used Avail Use% Mounted on /dev/vdb3 99G 2.5G 91G 3% /mnt/test3 overlay 92G 201M 91G 1% /mnt/test3/df/merged $ df -hi /mnt/test3 /mnt/test3/df/merged Filesystem Inodes IUsed IFree IUse% Mounted on /dev/vdb3 6.3M 2.4K 6.3M 1% /mnt/test3 overlay 6.3M 8 6.3M 1% /mnt/test3/df/merged 2) project quota enabled && with hard-limit $ df -h /mnt/test3 /mnt/test3/df/merged Filesystem Size Used Avail Use% Mounted on /dev/vdb3 99G 2.5G 91G 3% /mnt/test3 overlay 1.0G 201M 824M 20% /mnt/test3/df/merged $ df -hi /mnt/test3 /mnt/test3/df/merged Filesystem Inodes IUsed IFree IUse% Mounted on /dev/vdb3 6.3M 2.4K 6.3M 1% /mnt/test3 overlay 1000 8 992 1% /mnt/test3/df/merged Thanks, Chengguang. -- To unsubscribe from this list: send the line "unsubscribe linux-unionfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
