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Song Liu b95ee9049c bpf: Introduce bpf_cgroup_read_xattr to read xattr of cgroup's node 
BPF programs, such as LSM and sched_ext, would benefit from tags on
cgroups. One common practice to apply such tags is to set xattrs on
cgroupfs folders.

Introduce kfunc bpf_cgroup_read_xattr, which allows reading cgroup's
xattr.

Note that, we already have bpf_get_[file|dentry]_xattr. However, these
two APIs are not ideal for reading cgroupfs xattrs, because:

  1) These two APIs only works in sleepable contexts;
  2) There is no kfunc that matches current cgroup to cgroupfs dentry.

bpf_cgroup_read_xattr is generic and can be useful for many program
types. It is also safe, because it requires trusted or rcu protected
argument (KF_RCU). Therefore, we make it available to all program types.

Signed-off-by: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/20250623063854.1896364-3-song@kernel.org
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
2025-07-02 14:18:20 +02:00
..
9p
Merge tag 'vfs-6.16-rc1.netfs' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-06-02 15:04:06 -07:00
adfs
Merge patch series "adfs, affs, befs, hfs, hfsplus: convert to new mount api"
2024-10-08 14:41:53 +02:00
affs
Merge tag 'vfs-6.15-rc1.async.dir' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-03-24 10:47:14 -07:00
afs
Merge tag 'vfs-6.16-rc1.netfs' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-06-02 15:04:06 -07:00
autofs
VFS: rename lookup_one_len family to lookup_noperm and remove permission check
2025-04-08 11:24:36 +02:00
bcachefs
Merge tag 'bcachefs-2025-06-04' of git://evilpiepirate.org/bcachefs
2025-06-04 19:14:24 -07:00
befs
befs: convert befs to use the new mount api
2024-09-18 11:44:43 +02:00
bfs
bfs: convert bfs to use the new mount api
2025-04-07 09:36:20 +02:00
btrfs
Merge tag 'for-6.16-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux
2025-05-28 11:59:25 -07:00
cachefiles
Merge tag 'vfs-6.16-rc1.netfs' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-06-02 15:04:06 -07:00
ceph
Merge tag 'ceph-for-6.16-rc1' of https://github.com/ceph/ceph-client
2025-06-06 17:56:19 -07:00
coda
Change inode_operations.mkdir to return struct dentry *
2025-02-27 20:00:17 +01:00
configfs
Merge tag 'mm-nonmm-stable-2025-05-31-15-28' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2025-05-31 19:12:53 -07:00
cramfs
…
crypto
fscrypt: add support for hardware-wrapped keys
2025-04-08 19:32:11 -07:00
debugfs
VFS: rename lookup_one_len family to lookup_noperm and remove permission check
2025-04-08 11:24:36 +02:00
devpts
devpts: Fix type for uid and gid params
2025-04-07 15:22:12 +02:00
dlm
treewide, timers: Rename from_timer() to timer_container_of()
2025-06-08 09:07:37 +02:00
ecryptfs
VFS: rename lookup_one_len family to lookup_noperm and remove permission check
2025-04-08 11:24:36 +02:00
efivarfs
Merge tag 'vfs-6.16-rc1.super' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-05-26 09:33:44 -07:00
efs
efs: fix the efs new mount api implementation
2024-10-15 15:58:36 +02:00
erofs
Merge tag 'vfs-6.16-rc1.netfs' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-06-02 15:04:06 -07:00
exfat
exfat: do not clear volume dirty flag during sync
2025-05-26 20:25:23 +09:00
exportfs
readdir: supply dir_context.count as readdir buffer size hint
2025-05-29 12:31:23 +02:00
ext2
ext2: Deprecate DAX
2025-04-29 13:08:20 +02:00
ext4
treewide, timers: Rename from_timer() to timer_container_of()
2025-06-08 09:07:37 +02:00
f2fs
Merge tag 'f2fs-for-6.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs
2025-05-30 08:40:25 -07:00
fat
Change inode_operations.mkdir to return struct dentry *
2025-02-27 20:00:17 +01:00
freevxfs
freevxfs: Replace one-element array with flexible array member
2024-11-06 10:42:06 +01:00
fuse
Merge tag 'fuse-update-6.16' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse
2025-06-02 15:31:05 -07:00
gfs2
gfs2: Don't clear sb->s_fs_info in gfs2_sys_fs_add
2025-05-30 19:20:20 +02:00
hfs
Revert "hfs{plus}: add deprecation warning"
2025-04-19 22:48:59 +02:00
hfsplus
hfsplus: use bdev_rw_virt in hfsplus_submit_bio
2025-05-07 07:31:08 -06:00
hostfs
Merge tag 'uml-for-linux-6.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/uml/linux
2025-04-02 12:25:03 -07:00
hpfs
Change inode_operations.mkdir to return struct dentry *
2025-02-27 20:00:17 +01:00
hugetlbfs
Merge tag 'mm-stable-2025-03-30-16-52' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2025-04-01 09:29:18 -07:00
iomap
iomap: don't lose folio dropbehind state for overwrites
2025-05-28 09:26:07 +02:00
isofs
isofs: fix Y2038 and Y2156 issues in Rock Ridge TF entry
2025-04-15 11:56:57 +02:00
jbd2
treewide, timers: Rename from_timer() to timer_container_of()
2025-06-08 09:07:37 +02:00
jffs2
jffs2: check jffs2_prealloc_raw_node_refs() result in few other places
2025-05-22 20:54:38 +02:00
jfs
Merge tag 'mm-stable-2025-05-31-14-50' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2025-05-31 15:44:16 -07:00
kernfs
kernfs: remove iattr_mutex
2025-07-02 14:18:20 +02:00
lockd
sysctl: Fixes nsm_local_state bounds
2025-03-10 09:11:13 -04:00
minix
Change inode_operations.mkdir to return struct dentry *
2025-02-27 20:00:17 +01:00
netfs
Merge tag 'vfs-6.16-rc1.netfs' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-06-02 15:04:06 -07:00
nfs
Merge tag 'nfs-for-6.16-1' of git://git.linux-nfs.org/projects/anna/linux-nfs
2025-06-03 16:13:32 -07:00
nfs_common
nfs_localio: change nfsd_file_put_local() to take a pointer to __rcu pointer
2025-05-28 17:17:14 -04:00
nfsd
Merge tag 'nfs-for-6.16-1' of git://git.linux-nfs.org/projects/anna/linux-nfs
2025-06-03 16:13:32 -07:00
nilfs2
treewide, timers: Rename from_timer() to timer_container_of()
2025-06-08 09:07:37 +02:00
nls
move asm/unaligned.h to linux/unaligned.h
2024-10-02 17:23:23 -04:00
notify
Merge tag 'fsnotify_for_v6.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
2025-05-29 10:34:26 -07:00
ntfs3
Merge tag 'mm-stable-2025-06-01-14-06' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2025-06-02 16:00:26 -07:00
ocfs2
treewide, timers: Rename from_timer() to timer_container_of()
2025-06-08 09:07:37 +02:00
omfs
omfs: convert to new mount API
2025-04-28 10:54:39 +02:00
openpromfs
…
orangefs
Merge tag 'for-linus-6.16-ofs1' of git://git.kernel.org/pub/scm/linux/kernel/git/hubcap/linux
2025-05-28 12:05:30 -07:00
overlayfs
Merge tag 'ovl-update-v2-6.16' of git://git.kernel.org/pub/scm/linux/kernel/git/overlayfs/vfs
2025-06-06 17:54:09 -07:00
proc
Merge tag 'mm-nonmm-stable-2025-05-31-15-28' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2025-05-31 19:12:53 -07:00
pstore
treewide: Switch/rename to timer_delete[_sync]()
2025-04-05 10:30:12 +02:00
qnx4
…
qnx6
fs/qnx6: Fix building with GCC 15
2024-12-03 10:40:36 +01:00
quota
VFS: rename lookup_one_len family to lookup_noperm and remove permission check
2025-04-08 11:24:36 +02:00
ramfs
Change inode_operations.mkdir to return struct dentry *
2025-02-27 20:00:17 +01:00
resctrl
fs/resctrl: Restore the rdt_last_cmd_clear() calls after acquiring rdtgroup_mutex
2025-06-04 20:32:55 +02:00
romfs
…
smb
Merge tag '6.16-rc-part2-smb3-client-fixes' of git://git.samba.org/sfrench/cifs-2.6
2025-06-08 10:20:21 -07:00
squashfs
squashfs: add optional full compressed block caching
2025-05-27 19:40:33 -07:00
sysfs
sysfs: constify attribute_group::bin_attrs
2025-04-15 18:46:10 +02:00
tests
…
tracefs
VFS: rename lookup_one_len family to lookup_noperm and remove permission check
2025-04-08 11:24:36 +02:00
ubifs
Merge tag 'ubifs-for-linus-6.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/ubifs
2025-06-07 07:24:07 -07:00
udf
udf: Make sure i_lenExtents is uptodate on inode eviction
2025-05-07 12:04:07 +02:00
ufs
ufs: convert ufs to the new mount API
2025-05-14 22:40:55 -04:00
unicode
unicode: kunit: change tests filename and path
2025-02-12 14:00:11 -08:00
vboxsf
vboxsf: Convert to writepages
2025-04-07 09:36:48 +02:00
verity
Revert "fsverity: relax build time dependency on CRYPTO_SHA256"
2025-02-17 11:34:15 -08:00
xfs
Merge tag 'vfs-6.16-rc2.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-06-02 12:49:16 -07:00
zonefs
zonefs: use bdev_rw_virt in zonefs_read_super
2025-05-07 07:31:07 -06:00
aio.c
fs: aio: initialize .ki_write_stream of read-write request
2025-05-07 08:00:11 -06:00
anon_inodes.c
anon_inode: raise SB_I_NODEV and SB_I_NOEXEC
2025-04-07 16:19:04 +02:00
attr.c
fs: handle delegated timestamps in setattr_copy_mgtime
2024-10-10 10:20:51 +02:00
backing-file.c
tree-wide: s/revert_creds_light()/revert_creds()/g
2024-12-02 11:25:09 +01:00
bad_inode.c
Change inode_operations.mkdir to return struct dentry *
2025-02-27 20:00:17 +01:00
binfmt_elf_fdpic.c
binfmt_elf_fdpic: fix variable set but not used warning
2025-03-07 20:07:33 -08:00
binfmt_elf.c
Merge tag 'vfs-6.16-rc1.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-05-26 09:02:39 -07:00
binfmt_flat.c
binfmt_flat: Fix integer overflow bug on 32 bit systems
2025-01-10 08:49:05 -08:00
binfmt_misc.c
VFS: rename lookup_one_len family to lookup_noperm and remove permission check
2025-04-08 11:24:36 +02:00
binfmt_script.c
…
bpf_fs_kfuncs.c
bpf: Introduce bpf_cgroup_read_xattr to read xattr of cgroup's node
2025-07-02 14:18:20 +02:00
buffer.c
Merge tag 'vfs-6.16-rc1.writepage' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-05-26 08:23:09 -07:00
char_dev.c
fs: Reorganize kerneldoc parameter names
2024-10-22 11:16:57 +02:00
compat_binfmt_elf.c
binfmt_elf: Wire up AT_HWCAP3 at AT_HWCAP4
2024-10-17 18:38:49 +01:00
coredump.c
coredump: validate socket name as it is written
2025-05-21 13:59:12 +02:00
d_path.c
…
dax.c
Merge tag 'vfs-6.16-rc2.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-06-02 12:49:16 -07:00
dcache.c
Merge tag 'vfs-6.16-rc1.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-05-26 09:02:39 -07:00
direct-io.c
…
drop_caches.c
fs: drop_caches: move sysctl to fs/drop_caches.c
2025-02-07 16:53:04 +01:00
eventfd.c
make use of anon_inode_getfile_fmode()
2025-02-21 10:25:31 +01:00
eventpoll.c
fs/eventpoll: fix endless busy loop after timeout has expired
2025-05-02 14:21:26 +02:00
exec.c
Merge tag 'mm-stable-2025-05-31-14-50' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2025-05-31 15:44:16 -07:00
fcntl.c
fs: get rid of __FMODE_NONOTIFY kludge
2024-12-09 11:34:29 +01:00
fhandle.c
exportfs: add permission method
2024-12-17 09:16:11 +01:00
file_table.c
fs: Make file-nr output the total allocated file handles
2025-04-21 10:27:58 +02:00
file.c
fs: fall back to file_ref_put() for non-last reference
2025-04-22 18:16:09 +02:00
filesystems.c
fs/filesystems: Fix potential unsigned integer underflow in fs_name()
2025-04-14 13:05:59 +02:00
fs_context.c
fs/fs_context: Mark an unlikely if condition with unlikely() in vfs_parse_monolithic_sep()
2025-04-14 13:05:59 +02:00
fs_parser.c
fs/fs_parse: Remove unused and problematic validate_constant_table()
2025-04-21 10:27:59 +02:00
fs_pin.c
…
fs_struct.c
…
fs_types.c
…
fs-writeback.c
fs: fs-writeback: move sysctl to fs/fs-writeback.c
2025-02-07 16:53:04 +01:00
fsopen.c
fs: support O_PATH fds with FSCONFIG_SET_FD
2025-02-12 10:02:10 +01:00
init.c
VFS: Change vfs_mkdir() to return the dentry.
2025-03-05 11:52:50 +01:00
inode.c
fs: call inode_sb_list_add() outside of inode hash lock
2025-03-20 13:06:51 +01:00
internal.h
Merge tag 'vfs-6.16-rc1.super' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-05-26 09:33:44 -07:00
ioctl.c
Merge tag 'vfs-6.16-rc1.super' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-05-26 09:33:44 -07:00
Kconfig
fs/resctrl: Add boiler plate for external resctrl code
2025-05-16 11:05:40 +02:00
Kconfig.binfmt
…
kernel_read_file.c
fdget(), trivial conversions
2024-11-03 01:28:06 -05:00
libfs.c
Merge tag 'vfs-6.16-rc1.super' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-05-26 09:33:44 -07:00
locks.c
treewide: const qualify ctl_tables where applicable
2025-01-28 13:48:37 +01:00
Makefile
fs/resctrl: Add boiler plate for external resctrl code
2025-05-16 11:05:40 +02:00
mbcache.c
…
mnt_idmapping.c
statmount: allow to retrieve idmappings
2025-02-12 12:12:27 +01:00
mount.h
Don't propagate mounts into detached trees
2025-05-26 17:35:32 -04:00
mpage.c
fs: use writeback_iter directly in mpage_writepages
2025-05-09 12:37:48 +02:00
namei.c
Merge tag 'vfs-6.16-rc1.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-05-26 09:02:39 -07:00
namespace.c
Merge tag 'pull-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2025-06-08 10:35:12 -07:00
nsfs.c
Merge tag 'vfs-6.15-rc1.nsfs' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-03-24 11:38:12 -07:00
open.c
fs/open: make do_truncate() killable
2025-05-15 12:03:12 +02:00
pidfs.c
Merge tag 'vfs-6.16-rc1.coredump' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-05-26 11:17:01 -07:00
pipe.c
sort.h: hoist cmp_int() into generic header file
2025-05-11 17:54:12 -07:00
pnode.c
Don't propagate mounts into detached trees
2025-05-26 17:35:32 -04:00
pnode.h
fix IS_MNT_PROPAGATING uses
2025-05-09 18:06:27 -04:00
posix_acl.c
acl: Annotate struct posix_acl with __counted_by()
2024-10-22 11:16:59 +02:00
proc_namespace.c
->mnt_devname is never NULL
2025-05-23 14:20:44 +02:00
read_write.c
fs/read_write: make default_llseek() killable
2025-05-15 12:03:12 +02:00
readdir.c
readdir: supply dir_context.count as readdir buffer size hint
2025-05-29 12:31:23 +02:00
remap_range.c
convert vfs_dedupe_file_range().
2024-11-03 01:28:07 -05:00
select.c
select: core_sys_select add unlikely branch hint on return path
2025-04-21 10:27:58 +02:00
seq_file.c
fs: Reorganize kerneldoc parameter names
2024-10-22 11:16:57 +02:00
signalfd.c
make use of anon_inode_getfile_fmode()
2025-02-21 10:25:31 +01:00
splice.c
splice: remove duplicate noinline from pipe_clear_nowait
2025-04-25 12:11:56 +02:00
stack.c
…
stat.c
Merge tag 'xfs-merge-6.16' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux
2025-05-26 12:56:01 -07:00
statfs.c
fdget_raw() users: switch to CLASS(fd_raw)
2024-11-03 01:28:06 -05:00
super.c
Merge tag 'pull-automount' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2025-05-30 15:38:29 -07:00
sync.c
fdget(), trivial conversions
2024-11-03 01:28:06 -05:00
sysctls.c
treewide: const qualify ctl_tables where applicable
2025-01-28 13:48:37 +01:00
timerfd.c
Merge tag 'timers-cleanups-2025-03-23' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2025-03-25 10:54:15 -07:00
userfaultfd.c
mm/userfaultfd: fix uninitialized output field for -EAGAIN race
2025-05-07 23:39:39 -07:00
utimes.c
fdget(), more trivial conversions
2024-11-03 01:28:06 -05:00
xattr.c
fs/xattr.c: fix simple_xattr_list to always include security.* xattrs
2025-04-28 10:53:22 +02:00