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[13.121.85.79]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-91c10a45336sm7461436d6.3.2026.10.20.13.26.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 20 Oct 2026 13:26:55 -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-fscrypt@vger.kernel.org, ebiggers@kernel.org, tytso@mit.edu, jaegeuk@kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v5 0/5] ceph: support subvolume quarantine Date: Tue, 20 Oct 2026 20:26:45 +0000 Message-Id: X-Mailer: git-send-email 2.34.1 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit CephFS subvolume quarantine isolates a subvolume while allowing recovery clients with q/Q MDS auth caps to access it. Advertise support only after cached data and metadata access paths can enforce quarantine. This series is based on the testing branch of: https://github.com/ceph/ceph-client.git at commit ed0502cb11f84fff29f374238e526ae94d9bdfde ("ceph: validate encoded xattr name lengths"). The repository defaults to for-linus; the base is available on testing. This series combines the fscrypt symlink-cache prerequisite and the Ceph quarantine series as requested by Eric and Xiubo. The dcache export is retained. The generic fscrypt change precedes the Ceph patches, and its Ceph opt-in is folded into the patch adding the get_link checks. Changes since v4: - Add the missing base-commit and identify the public testing branch. - Require a live, quarantine-aware AUTH_SHARED cap for cached head metadata access. Without it, ask the authoritative MDS for each operation, including cached stat, retained directory replies and encryption-policy/nonce ioctls. A successful reply without a cap authorizes only that operation. The fix is folded into patch 5; the first four patches and public base are unchanged. Changes since v3: - Disable only the two fscrypt symlink-cache writers. Leave cache readers unchanged and update fscrypt_symlink_getattr() kernel-doc. Explain the held O_PATH descriptor / empty-path readlinkat() bypass and the allocation and decryption cost of uncached encrypted symlink accesses. - Avoid unconditional snapshot RPCs only when the connected head inode is the target's actual subvolume root, identified by its nonzero MDS-provided subvolume ID, with a valid AUTH_SHARED cap from a quarantine-aware MDS and no local quarantine marks. A snapshot P/.snap/S/V/file cannot use ancestor P's cap to authorize access in V. Synthetic snapdirs inherit their parent's subvolume ID. Unknown IDs, other head ancestors, expired root caps and disconnected snapshots retain MDS checks. 32-bit clients also revalidate because membership IDs use plain 64-bit READ/WRITE_ONCE accesses. - Wait interruptibly and retry unstable namespace generations or MDS authorizations in blocking cap acquisition and revalidation. Preserve nonblocking behavior. Track splice owners and reject recursive LSM hooks with EBUSY, including hooks outside MDS reply processing. - Gate ACL cache suppression and namespace mutation bookkeeping on negotiated quarantine support. Invalidate older cached ACLs when support is first enabled and pair namespace tokens across that transition. - Remove the impossible NULL d_parent guards raised during VFS review. Validation: Ten deterministic source-extraction regression runners pass, including ASan/UBSan/LSan checks of VFS readlink and fscrypt target ownership. A warm same-subvolume-root snapshot harness performs 1000 getattr calls, 1024 read authorizations and 52 snapdir checks without an MDS RPC. A depth-300 harness completes 20000 blocking revalidations with injected namespace splices without EAGAIN. Additional cases cover feature activation, ACL cache invalidation, old-MDS caps, detached snapshots, epoch/rename races, interrupted waits, recovery permissions and stale cap messages. The ancestor snapshot regression fails on the earlier v4 draft and passes with the fix: zero local marks and a valid outside head cap still require per-operation MDS authorization for reads, cached stat and xattrs. Unknown IDs, non-root head caps and 32-bit clients also retain MDS revalidation. The new head coverage regression reproduces the cached-access bypass before the fix and verifies denial after it, with missing, PIN-only, expired or stale caps. Repeated accesses without a cap each request authorization; a live AUTH_SHARED head cap preserves the zero-RPC cached path. A fresh complete W=1 kernel and module build passes with GCC 14.2.0 and the normalized x86_64-rhel-9.4 robot config: vmlinux, bzImage and all 2233 configured modules, including ceph.ko and libceph.ko. MODPOST succeeds, and the GPL d_find_alias_rcu export resolves. Additional W=1 builds pass on x86-64 with ACL/encryption enabled and disabled, and on i386 with those features enabled. All five patches pass strict checkpatch and apply in order to reproduce the tested source tree. These are source harnesses, not live CephFS benchmark results. Live cluster, KASAN/lockdep, failover and snapshot throughput tests remain pending. Xiubo's v3 runtime results are separate evidence. Remaining protocol limits: Already installed snapshot PTEs still need server notifications to revoke access without a new filesystem callback. Snapshots without proven coverage by a cap on their own subvolume root, and all 32-bit snapshot operations, still authorize each operation through the MDS. Disable messages carry no generation, so same-rank ordering relies on ordered delivery. Overlapping ordinary rw and q/Q grants still require server-side auth-cap filtering; Xiubo reproduced that with ceph-fuse too. v4: https://lore.kernel.org/r/cover.1792498351.git.amarkuze@redhat.com/ v3: https://lore.kernel.org/r/cover.1792248177.33a6e2db0a.git.amarkuze@redhat.com/ v2: https://lore.kernel.org/r/cover.1792074165.git.amarkuze@redhat.com/ fscrypt discussion: https://lore.kernel.org/r/a01d0a297a3e174d21741a3ad586ce546327603e.1792081664.git.amarkuze@redhat.com/ Alex Markuze (5): dcache: export d_find_alias_rcu() for modular filesystems fscrypt: allow filesystems to disable symlink target caching 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 | 33 +- fs/ceph/addr.c | 72 ++- fs/ceph/caps.c | 317 +++++++++++- fs/ceph/crypto.c | 1 + fs/ceph/debugfs.c | 1 + fs/ceph/dir.c | 54 +- fs/ceph/file.c | 112 +++- fs/ceph/inode.c | 954 ++++++++++++++++++++++++++++++++++- fs/ceph/ioctl.c | 13 + fs/ceph/mds_client.c | 28 +- fs/ceph/mds_client.h | 30 +- fs/ceph/super.c | 4 + fs/ceph/super.h | 101 +++- fs/ceph/xattr.c | 54 +- fs/crypto/hooks.c | 28 +- fs/dcache.c | 1 + include/linux/ceph/ceph_fs.h | 13 + include/linux/fscrypt.h | 7 + net/ceph/ceph_common.c | 2 + 19 files changed, 1712 insertions(+), 113 deletions(-) base-commit: ed0502cb11f84fff29f374238e526ae94d9bdfde