Hey Linus,
/* Summary */
This contains cleanups for the lookup_one*() family of helpers.
We expose a set of functions with names containing "lookup_one_len" and
others without the "_len". This difference has nothing to do with
"len". It's rater a historical accident that can be confusing.
The functions without "_len" take a "mnt_idmap" pointer. This is found
in the "vfsmount" and that is an important question when choosing which
to use: do you have a vfsmount, or are you "inside" the filesystem. A
related question is "is permission checking relevant here?".
nfsd and cachefiles *do* have a vfsmount but *don't* use the non-_len
functions. They pass nop_mnt_idmap and refuse to work on filesystems
which have any other idmap.
This work changes nfsd and cachefile to use the lookup_one family of
functions and to explictily pass &nop_mnt_idmap which is consistent with
all other vfs interfaces used where &nop_mnt_idmap is explicitly passed.
The remaining uses of the "_one" functions do not require permission
checks so these are renamed to be "_noperm" and the permission checking
is removed.
This series also changes these lookup function to take a qstr instead of
separate name and len. In many cases this simplifies the call.
/* Testing */
gcc (Debian 14.2.0-19) 14.2.0
Debian clang version 19.1.7 (3)
No build failures or warnings were observed.
/* Conflicts */
Merge conflicts with mainline
=============================
No known conflicts.
Merge conflicts with other trees
================================
No known conflicts.
The following changes since commit 0af2f6be1b4281385b618cb86ad946eded089ac8:
Linux 6.15-rc1 (2025-04-06 13:11:33 -0700)
are available in the Git repository at:
git@xxxxxxxxxxxxxxxxxxx:pub/scm/linux/kernel/git/vfs/vfs tags/vfs-6.16-rc1.async.dir
for you to fetch changes up to 4e5c53e03806359e68dde5e951e50cd1f4908405:
Merge patch series "VFS: improve interface for lookup_one functions" (2025-04-08 11:24:42 +0200)
Please consider pulling these changes from the signed vfs-6.16-rc1.async.dir tag.
Thanks!
Christian
----------------------------------------------------------------
vfs-6.16-rc1.async.dir
----------------------------------------------------------------
Christian Brauner (1):
Merge patch series "VFS: improve interface for lookup_one functions"
NeilBrown (6):
VFS: improve interface for lookup_one functions
nfsd: Use lookup_one() rather than lookup_one_len()
cachefiles: Use lookup_one() rather than lookup_one_len()
VFS: rename lookup_one_len family to lookup_noperm and remove permission check
Use try_lookup_noperm() instead of d_hash_and_lookup() outside of VFS
VFS: change lookup_one_common and lookup_noperm_common to take a qstr
Documentation/filesystems/porting.rst | 40 +++++++++
arch/s390/hypfs/inode.c | 2 +-
drivers/android/binderfs.c | 4 +-
drivers/infiniband/hw/qib/qib_fs.c | 4 +-
fs/afs/dir.c | 2 +-
fs/afs/dir_silly.c | 6 +-
fs/autofs/dev-ioctl.c | 3 +-
fs/binfmt_misc.c | 2 +-
fs/btrfs/ioctl.c | 9 +-
fs/cachefiles/internal.h | 1 -
fs/cachefiles/key.c | 1 -
fs/cachefiles/namei.c | 14 +--
fs/dcache.c | 1 -
fs/debugfs/inode.c | 6 +-
fs/ecryptfs/inode.c | 16 ++--
fs/efivarfs/super.c | 15 ++--
fs/exportfs/expfs.c | 5 +-
fs/internal.h | 1 +
fs/kernfs/mount.c | 2 +-
fs/namei.c | 156 +++++++++++++++++-----------------
fs/nfs/unlink.c | 11 ++-
fs/nfsd/nfs3proc.c | 4 +-
fs/nfsd/nfs3xdr.c | 4 +-
fs/nfsd/nfs4proc.c | 4 +-
fs/nfsd/nfs4recover.c | 13 +--
fs/nfsd/nfs4xdr.c | 4 +-
fs/nfsd/nfsproc.c | 5 +-
fs/nfsd/vfs.c | 17 ++--
fs/overlayfs/export.c | 6 +-
fs/overlayfs/namei.c | 14 +--
fs/overlayfs/overlayfs.h | 2 +-
fs/overlayfs/readdir.c | 9 +-
fs/proc/base.c | 2 +-
fs/quota/dquot.c | 2 +-
fs/smb/client/cached_dir.c | 5 +-
fs/smb/client/cifsfs.c | 3 +-
fs/smb/client/readdir.c | 3 +-
fs/smb/server/smb2pdu.c | 7 +-
fs/tracefs/inode.c | 2 +-
fs/xfs/scrub/orphanage.c | 7 +-
include/linux/dcache.h | 4 +-
include/linux/namei.h | 17 ++--
ipc/mqueue.c | 5 +-
kernel/bpf/inode.c | 2 +-
net/sunrpc/rpc_pipe.c | 12 +--
security/apparmor/apparmorfs.c | 4 +-
security/inode.c | 2 +-
security/selinux/selinuxfs.c | 4 +-
48 files changed, 254 insertions(+), 210 deletions(-)
