simple xattr improvements [LWN.net]

From:		Miklos Szeredi <mszeredi-AT-redhat.com>
To:		linux-fsdevel-AT-vger.kernel.org
Subject:		[PATCH v4 0/4] simple xattr improvements
Date:		Fri, 05 Jun 2026 15:53:15 +0200
Message-ID:		<20260605135322.2632068-1-mszeredi@redhat.com>
Cc:		linux-mm-AT-kvack.org, Christian Brauner <brauner-AT-kernel.org>
Archive-link:		Article

v4:
 - yet another accounting fix for shmem_initxattrs

v3:
 - need per kernfs_node locking for simple_xattr_set
 - another accounting fix for shmem_initxattrs

v2:
 - don't use xxhash
 - fix lazy alloc concurrency
 - fix rcu freeing on evict
 - fix rcu walk of per-inode list
 - don't double account freed space

---
Miklos Szeredi (4):
  kernfs: fix xattr race condition with multiple superblocks
  tmpfs: simplify constructing "security.foo" xattr names
  simple_xattr: change interface to pass struct simple_xattrs **
  simpe_xattr: use per-sb cache

 fs/kernfs/dir.c             |  13 +-
 fs/kernfs/file.c            |  13 +-
 fs/kernfs/inode.c           |  36 ++---
 fs/kernfs/kernfs-internal.h |  24 +++-
 fs/kernfs/mount.c           |   2 +-
 fs/pidfs.c                  |  45 ++-----
 fs/xattr.c                  | 261 +++++++++++++++++++-----------------
 include/linux/kernfs.h      |  11 +-
 include/linux/shmem_fs.h    |   3 +-
 include/linux/xattr.h       |  35 +++--
 mm/shmem.c                  |  50 +++----
 net/socket.c                |  30 ++---
 12 files changed, 252 insertions(+), 271 deletions(-)

-- 
2.54.0