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Description of problem:

kernel 4.18.0-358.el8 breaks the ceph client for clients with osd caps restricted to an osd namespace. This kernel was the first to enable async dirops by default; the issue was fixed by mounting with async dirops disabled (-owsync).
Details are in https://tracker.ceph.com/issues/54013


Version-Release number of selected component (if applicable):

kernel 4.18.0-358.el8

Also reproduced with upstream kernel 5.16.2

How to reproduce:

Mount a ceph file share with caps like

[client.xxx]
        key = xx==
        caps mds = "allow rw path=/volumes/_nogroup/xxx" 
        caps mon = "allow r" 
        caps osd = "allow rw pool=cephfs_data namespace=fsvolumens_xxx" 

Then try to untar a kernel, you'll get errors like

# tar xf linux-5.17-rc1.tar.gz 2>&1 | head
tar: linux-5.17-rc1/.get_maintainer.ignore: Cannot write: Operation not permitted
tar: linux-5.17-rc1/.gitattributes: Cannot write: Operation not permitted
tar: linux-5.17-rc1/.gitignore: Cannot write: Operation not permitted

Fix:

This patch is the proposed fix: https://lore.kernel.org/ceph-devel/20220125211022.114286-1-jlayton@kernel.org/T/#u

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (Important: kernel security, bug fix, and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2022:1988