[GIT PULL 14/12 for v7.0] vfs misc 2
From: Christian Brauner
Date: Mon Feb 16 2026 - 07:57:53 EST
Hey Linus,
as announced in [1] this is one of pull requests that was delayed.
/* Summary */
This contains the second and last batch of misc vfs changes.
Features:
- Optimize close_range() from O(range size) to O(active FDs) by using
find_next_bit() on the open_fds bitmap instead of linearly scanning
the entire requested range. This is a significant improvement for
large-range close operations on sparse file descriptor tables.
- Add FS_XFLAG_VERITY file attribute for fs-verity files, retrievable
via FS_IOC_FSGETXATTR and file_getattr(). The flag is read-only. Add
tracepoints for fs-verity enable and verify operations, replacing the
previously removed debug printk's.
- Prevent nfsd from exporting special kernel filesystems like pidfs and
nsfs. These filesystems have custom ->open() and ->permission() export
methods that are designed for open_by_handle_at(2) only and are
incompatible with nfsd. Update the exportfs documentation accordingly.
Fixes:
- Fix KMSAN uninit-value in ovl_fill_real() where strcmp() was used on a
non-null-terminated decrypted directory entry name from fscrypt. This
triggered on encrypted lower layers when the decrypted name buffer
contained uninitialized tail data. The fix also adds VFS-level
name_is_dot(), name_is_dotdot(), and name_is_dot_dotdot() helpers,
replacing various open-coded "." and ".." checks across the tree.
- Fix read-only fsflags not being reset together with xflags in
vfs_fileattr_set(). Currently harmless since no read-only xflags
overlap with flags, but this would cause inconsistencies for any future
shared read-only flag.
- Return -EREMOTE instead of -ESRCH from PIDFD_GET_INFO when the target
process is in a different pid namespace. This lets userspace
distinguish "process exited" from "process in another namespace",
matching glibc's pidfd_getpid() behavior.
Cleanups:
- Use C-string literals in the Rust seq_file bindings, replacing the
kernel::c_str!() macro (available since Rust 1.77).
- Fix typo in d_walk_ret enum comment, add porting notes for the
readlink_copy() calling convention change.
Link: https://lore.kernel.org/20260206-vfs-v70-7df0b750d594@brauner [1]
/* Testing */
gcc (Debian 14.2.0-19) 14.2.0
Debian clang version 19.1.7 (3+b1)
No build failures or warnings were observed.
/* Conflicts */
Merge conflicts with mainline
=============================
No known conflicts.
Merge conflicts with other trees
================================
This has a merge conflict with my kernel-7.0-rc1.misc pull request:
diff --cc Documentation/filesystems/porting.rst
index 79e2c3008289,bd4128ccbb67..000000000000
--- a/Documentation/filesystems/porting.rst
+++ b/Documentation/filesystems/porting.rst
@@@ -1336,18 -1339,8 +1336,28 @@@ in-tree filesystems have done)
**mandatory**
+The ->setlease() file_operation must now be explicitly set in order to provide
+support for leases. When set to NULL, the kernel will now return -EINVAL to
+attempts to set a lease. Filesystems that wish to use the kernel-internal lease
+implementation should set it to generic_setlease().
+
+---
+
+**mandatory**
+
+fs/namei.c primitives that consume filesystem references (do_renameat2(),
+do_linkat(), do_symlinkat(), do_mkdirat(), do_mknodat(), do_unlinkat()
+and do_rmdir()) are gone; they are replaced with non-consuming analogues
+(filename_renameat2(), etc.)
+Callers are adjusted - responsibility for dropping the filenames belongs
+to them now.
++
++---
++
++**mandatory**
++
+ readlink_copy() now requires link length as the 4th argument. Said length needs
+ to match what strlen() would return if it was ran on the string.
+
+ However, if the string is freely accessible for the duration of inode's
+ lifetime, consider using inode_set_cached_link() instead.
The following changes since commit 6cbfdf89470ef3c2110f376a507d135e7a7a7378:
posix_acl: make posix_acl_to_xattr() alloc the buffer (2026-01-16 10:51:12 +0100)
are available in the Git repository at:
git@xxxxxxxxxxxxxxxxxxx:pub/scm/linux/kernel/git/vfs/vfs tags/vfs-7.0-rc1.misc.2
for you to fetch changes up to dedfae78f00960d703badc500422d10e1f12b2bc:
fs: add porting notes about readlink_copy() (2026-02-03 15:17:34 +0100)
----------------------------------------------------------------
vfs-7.0-rc1.misc.2
Please consider pulling these changes from the signed vfs-7.0-rc1.misc.2 tag.
Thanks!
Christian
----------------------------------------------------------------
Amir Goldstein (4):
fs: add helpers name_is_dot{,dot,_dotdot}
ovl: use name_is_dot* helpers in readdir code
exportfs: clarify the documentation of open()/permission() expotrfs ops
nfsd: do not allow exporting of special kernel filesystems
Andrey Albershteyn (3):
fs: reset read-only fsflags together with xflags
fs: add FS_XFLAG_VERITY for fs-verity files
fsverity: add tracepoints
Chelsy Ratnawat (1):
fs: dcache: fix typo in enum d_walk_ret comment
Christian Brauner (2):
Merge patch series "name_is_dot* cleanup"
Merge patch series "Add traces and file attributes for fs-verity"
Luca Boccassi (1):
pidfs: return -EREMOTE when PIDFD_GET_INFO is called on another ns
Mateusz Guzik (1):
fs: add porting notes about readlink_copy()
Qiliang Yuan (1):
fs/file: optimize close_range() complexity from O(N) to O(Sparse)
Qing Wang (1):
ovl: Fix uninit-value in ovl_fill_real
Tamir Duberstein (1):
rust: seq_file: replace `kernel::c_str!` with C-Strings
Documentation/filesystems/fsverity.rst | 16 ++++
Documentation/filesystems/porting.rst | 10 +++
MAINTAINERS | 1 +
fs/crypto/fname.c | 2 +-
fs/dcache.c | 10 +--
fs/ecryptfs/crypto.c | 2 +-
fs/exportfs/expfs.c | 3 +-
fs/f2fs/dir.c | 2 +-
fs/f2fs/hash.c | 2 +-
fs/file.c | 10 ++-
fs/file_attr.c | 10 ++-
fs/namei.c | 2 +-
fs/nfsd/export.c | 8 +-
fs/overlayfs/readdir.c | 41 ++++-----
fs/pidfs.c | 2 +-
fs/smb/server/vfs.c | 2 +-
fs/verity/enable.c | 4 +
fs/verity/fsverity_private.h | 2 +
fs/verity/init.c | 1 +
fs/verity/verify.c | 9 ++
include/linux/exportfs.h | 21 ++++-
include/linux/fileattr.h | 6 +-
include/linux/fs.h | 14 +++-
include/trace/events/fsverity.h | 146 +++++++++++++++++++++++++++++++++
include/uapi/linux/fs.h | 1 +
rust/kernel/seq_file.rs | 4 +-
26 files changed, 274 insertions(+), 57 deletions(-)
create mode 100644 include/trace/events/fsverity.h