From: Linus Torvalds Date: Mon, 1 Dec 2025 23:34:41 +0000 (-0800) Subject: Merge tag 'vfs-6.19-rc1.directory.delegations' of git://git.kernel.org/pub/scm/linux... X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=db74a7d02ae244ec0552d18f51054f9ae0d921ad;p=thirdparty%2Fkernel%2Flinux.git Merge tag 'vfs-6.19-rc1.directory.delegations' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs Pull directory delegations update from Christian Brauner: "This contains the work for recall-only directory delegations for knfsd. Add support for simple, recallable-only directory delegations. This was decided at the fall NFS Bakeathon where the NFS client and server maintainers discussed how to merge directory delegation support. The approach starts with recallable-only delegations for several reasons: 1. RFC8881 has gaps that are being addressed in RFC8881bis. In particular, it requires directory position information for CB_NOTIFY callbacks, which is difficult to implement properly under Linux. The spec is being extended to allow that information to be omitted. 2. Client-side support for CB_NOTIFY still lags. The client side involves heuristics about when to request a delegation. 3. Early indication shows simple, recallable-only delegations can help performance. Anna Schumaker mentioned seeing a multi-minute speedup in xfstests runs with them enabled. With these changes, userspace can also request a read lease on a directory that will be recalled on conflicting accesses. This may be useful for applications like Samba. Users can disable leases altogether via the fs.leases-enable sysctl if needed. VFS changes: - Dedicated Type for Delegations Introduce struct delegated_inode to track inodes that may have delegations that need to be broken. This replaces the previous approach of passing raw inode pointers through the delegation breaking code paths, providing better type safety and clearer semantics for the delegation machinery. - Break parent directory delegations in open(..., O_CREAT) codepath - Allow mkdir to wait for delegation break on parent - Allow rmdir to wait for delegation break on parent - Add try_break_deleg calls for parents to vfs_link(), vfs_rename(), and vfs_unlink() - Make vfs_create(), vfs_mknod(), and vfs_symlink() break delegations on parent directory - Clean up argument list for vfs_create() - Expose delegation support to userland Filelock changes: - Make lease_alloc() take a flags argument - Rework the __break_lease API to use flags - Add struct delegated_inode - Push the S_ISREG check down to ->setlease handlers - Lift the ban on directory leases in generic_setlease NFSD changes: - Allow filecache to hold S_IFDIR files - Allow DELEGRETURN on directories - Wire up GET_DIR_DELEGATION handling Fixes: - Fix kernel-doc warnings in __fcntl_getlease - Add needed headers for new struct delegation definition" * tag 'vfs-6.19-rc1.directory.delegations' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs: vfs: add needed headers for new struct delegation definition filelock: __fcntl_getlease: fix kernel-doc warnings vfs: expose delegation support to userland nfsd: wire up GET_DIR_DELEGATION handling nfsd: allow DELEGRETURN on directories nfsd: allow filecache to hold S_IFDIR files filelock: lift the ban on directory leases in generic_setlease vfs: make vfs_symlink break delegations on parent dir vfs: make vfs_mknod break delegations on parent directory vfs: make vfs_create break delegations on parent directory vfs: clean up argument list for vfs_create() vfs: break parent dir delegations in open(..., O_CREAT) codepath vfs: allow rmdir to wait for delegation break on parent vfs: allow mkdir to wait for delegation break on parent vfs: add try_break_deleg calls for parents to vfs_{link,rename,unlink} filelock: push the S_ISREG check down to ->setlease handlers filelock: add struct delegated_inode filelock: rework the __break_lease API to use flags filelock: make lease_alloc() take a flags argument --- db74a7d02ae244ec0552d18f51054f9ae0d921ad