Hi all, Hi Zheng, We're seeing a strange issue with the kernel cephfs clients, combined with a path restricted mds cap. It seems that files/dirs are intermittently not created due to permission denied. For example, when I untar a kernel into cephfs, we see ~1/1000 files failed to open/mkdir. Client caps are in the PS [1]. We've tried kernels 3.10.0-493.el7, 4.8.6, and 4.9-rc4 -- all have the same intermittent behaviour. We could *not* reproduce the issue with ceph-fuse 10.2.3. The cluster is running 10.2.3. Now, if we remove the path restricted cap -- i.e. use mds 'allow rw' -- then we have no more errors. So it seems there is a race in the path restriction cap code. We grabbed an mds log, and noticed that it seems that a file is opened twice, then the second open fails with 'already xlocked'. A full log for one such file is here: http://pastebin.com/raw/YyULfjND Is anyone successfully using path caps with kernel clients? Maybe this is a new bug? Cheers, Dan [1] [client.k8s] key: xxx== caps: [mds] allow r, allow rw path=/k8s caps: [mon] allow r caps: [osd] allow rw pool=cephfs_data_k8s _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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