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(4f.55.790d.ip4.static.sl-reverse.com. [13.121.85.79]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-6b38a1b113dsm1913032a12.10.2026.10.17.06.40.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 17 Oct 2026 06:40:20 -0700 (PDT) From: Alex Markuze To: ceph-devel@vger.kernel.org Cc: Alex Markuze , idryomov@gmail.com, xiubo.li@clyso.com, slava@dubeyko.com, viro@zeniv.linux.org.uk, brauner@kernel.org, jack@suse.cz, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v3 0/4] ceph: support subvolume quarantine Date: Sat, 17 Oct 2026 13:40:12 +0000 Message-Id: X-Mailer: git-send-email 2.34.1 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit CephFS subvolume quarantine isolates a subvolume while allowing access by recovery clients with q/Q MDS auth caps. The kernel client currently does not advertise quarantine support, so the MDS can hold its requests until quarantine is lifted. This series handles MClientCaps v14 quarantine notifications, checks cached data and metadata access, and handles disable notifications. Fresh MDS replies allow recovery after a lost disable. It applies directly to the base below and has no fscrypt prerequisite. The first patch exports d_find_alias_rcu() to GPL modules. The remaining three patches add the wire definitions, record quarantine state and ancestry generations, then install the access checks before advertising the session feature. Changes since v2: - Add the VFS export prerequisite to fix the undefined d_find_alias_rcu symbol reported by the kernel test robot with CONFIG_CEPH_FS=m. The fix carries Reported-by and Closes tags. - Keep all three Ceph patches unchanged from v2. - Replace object-only compile validation with a complete W=1 kernel and module build using GCC 14.2.0 and the robot's x86_64-rhel-9.4 config. Validation: A complete W=1 build with the kernel.org GCC 14.2.0 toolchain and the robot's x86_64-rhel-9.4 config after olddefconfig passes. It produces vmlinux, bzImage and all 2,233 configured modules, including ceph.ko and libceph.ko. MODPOST succeeds, and Module.symvers contains the GPL export of d_find_alias_rcu. Configuration changes are limited to olddefconfig's toolchain capability normalization; there are no manual config changes. W=1 warnings remain elsewhere in the kernel; none come from Ceph or dcache.c. All four patches pass strict checkpatch and apply in order to reproduce the tested source tree. Seven deterministic source-extraction regression runners pass; the ASan/UBSan/LSan VFS runner also demonstrates the remaining cached encrypted-readlink bypass. Known limitation: cached encrypted symlink targets can bypass quarantine checks. fscrypt populates inode->i_link, which the VFS can use for readlink or symlink traversal without calling Ceph's get_link operation. Uncached encrypted targets and plaintext symlinks still pass through Ceph's checks. Closing the encrypted-target cache gap needs the separate fscrypt support and Ceph opt-in follow-up. Live cluster, KASAN/lockdep, multi-MDS recovery and depth benchmarks have not been run for this version. Existing snapshot mappings need server notifications to revoke already installed PTEs. Disable messages carry no generation, so same-rank ordering relies on ordered MDS delivery. Recovery assumes the intended rwq/rwQ delegation; overlapping ordinary rw and read-only q/Q grants still need server-side cap filtering. v2: https://lore.kernel.org/r/cover.1792074165.git.amarkuze@redhat.com Robot report: https://lore.kernel.org/oe-kbuild-all/202610171220.i77KPiw5-lkp@intel.com/ Alex Markuze (4): dcache: export d_find_alias_rcu() for modular filesystems ceph: add subvolume quarantine wire definitions ceph: record subvolume quarantine from MDS cap updates ceph: fail quarantined subvolume access with EACCES fs/ceph/acl.c | 28 +- fs/ceph/addr.c | 72 ++- fs/ceph/caps.c | 291 +++++++++++- fs/ceph/debugfs.c | 1 + fs/ceph/dir.c | 51 ++- fs/ceph/file.c | 117 +++-- fs/ceph/inode.c | 841 ++++++++++++++++++++++++++++++++++- fs/ceph/ioctl.c | 13 + fs/ceph/mds_client.c | 23 +- fs/ceph/mds_client.h | 26 +- fs/ceph/super.c | 2 + fs/ceph/super.h | 80 +++- fs/ceph/xattr.c | 54 ++- fs/dcache.c | 1 + include/linux/ceph/ceph_fs.h | 13 + net/ceph/ceph_common.c | 2 + 16 files changed, 1482 insertions(+), 133 deletions(-) base-commit: ed0502cb11f84fff29f374238e526ae94d9bdfde -- 2.34.1