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Tejun Heo 783bd07d09 kernfs: Implement kernfs_show() 
Currently, kernfs nodes can be created hidden and activated later by calling
kernfs_activate() to allow creation of multiple nodes to succeed or fail as
a unit. This is an one-way one-time-only transition. This patch introduces
kernfs_show() which can toggle visibility dynamically.

As the currently proposed use - toggling the cgroup pressure files - only
requires operating on leaf nodes, for the sake of simplicity, restrict it as
such for now.

Hiding uses the same mechanism as deactivation and likewise guarantees that
there are no in-flight operations on completion. KERNFS_ACTIVATED and
KERNFS_HIDDEN are used to manage the interactions between activations and
show/hide operations. A node is visible iff both activated & !hidden.

Cc: Chengming Zhou <zhouchengming@bytedance.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Tested-by: Chengming Zhou <zhouchengming@bytedance.com>
Reviewed-by: Chengming Zhou <zhouchengming@bytedance.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20220828050440.734579-9-tj@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-09-01 18:08:44 +02:00
..
9p
9p: Fix some kernel-doc comments
2022-07-02 18:52:21 +09:00
adfs
fs: Convert block_read_full_page() to block_read_full_folio()
2022-05-09 16:21:44 -04:00
affs
affs: use memcpy_to_page and remove replace kmap_atomic()
2022-08-01 19:53:31 +02:00
afs
afs: Enable multipage folio support
2022-08-13 17:20:51 -07:00
autofs
autofs: remove unused ino field inode
2022-07-17 17:31:42 -07:00
befs
befs: Convert befs_symlink_read_folio() to use a folio
2022-08-02 12:34:03 -04:00
bfs
fs: Convert block_read_full_page() to block_read_full_folio()
2022-05-09 16:21:44 -04:00
btrfs
for-6.0-rc1-tag
2022-08-19 13:33:48 -07:00
cachefiles
cachefiles: narrow the scope of flushed requests when releasing fd
2022-07-05 16:12:21 +01:00
ceph
We have a good pile of various fixes and cleanups from Xiubo, Jeff,
2022-08-11 12:41:07 -07:00
cifs
cifs: move from strlcpy with unused retval to strscpy
2022-08-19 11:02:26 -05:00
coda
coda: Convert coda_symlink_filler() to use a folio
2022-08-02 12:34:03 -04:00
configfs
configfs: fix a race in configfs_{,un}register_subsystem()
2022-02-22 18:30:28 +01:00
cramfs
cramfs: read_mapping_page() is synchronous
2022-08-02 12:34:02 -04:00
crypto
We have a good pile of various fixes and cleanups from Xiubo, Jeff,
2022-08-11 12:41:07 -07:00
debugfs
debugfs: Document that debugfs_create functions need not be error checked
2022-02-25 11:56:13 +01:00
devpts
fsnotify: fix fsnotify hooks in pseudo filesystems
2022-01-24 14:17:02 +01:00
dlm
fs: dlm: move kref_put assert for lkb structs
2022-08-01 09:31:46 -05:00
ecryptfs
ecryptfs: Convert ecryptfs to read_folio
2022-05-09 16:21:45 -04:00
efivarfs
efi: vars: Move efivar caching layer into efivarfs
2022-06-24 20:40:19 +02:00
efs
efs: Convert efs symlinks to read_folio
2022-05-09 16:21:45 -04:00
erofs
- The usual batches of cleanups from Baoquan He, Muchun Song, Miaohe
2022-08-05 16:32:45 -07:00
exfat
exfat: Drop superfluous new line for error messages
2022-08-01 10:14:07 +09:00
exportfs
exportfs: support idmapped mounts
2022-04-28 16:31:10 +02:00
ext2
- The usual batches of cleanups from Baoquan He, Muchun Song, Miaohe
2022-08-05 16:32:45 -07:00
ext4
- The usual batches of cleanups from Baoquan He, Muchun Song, Miaohe
2022-08-05 16:32:45 -07:00
f2fs
f2fs-for-6.0
2022-08-08 11:18:31 -07:00
fat
Updates to various subsystems which I help look after. lib, ocfs2,
2022-08-07 10:03:24 -07:00
freevxfs
freevxfs: Convert vxfs_immed_read_folio() to use a folio
2022-08-02 12:34:03 -04:00
fscache
fscache: add tracepoint when failing cookie
2022-08-09 14:13:59 +01:00
fuse
iov_iter stuff, part 2, rebased
2022-08-08 20:04:35 -07:00
gfs2
New code for 6.0:
2022-08-11 13:11:49 -07:00
hfs
hfs: Remove check for PageError
2022-06-29 08:51:06 -04:00
hfsplus
Folio changes for 6.0
2022-08-03 10:35:43 -07:00
hostfs
hostfs: Handle page write errors correctly
2022-08-02 12:34:02 -04:00
hpfs
hpfs: Convert symlinks to read_folio
2022-05-09 16:21:45 -04:00
hugetlbfs
iov_iter stuff, part 2, rebased
2022-08-08 20:04:35 -07:00
iomap
New code for 6.0:
2022-08-11 13:11:49 -07:00
isofs
fs/buffer: Combine two submit_bh() and ll_rw_block() arguments
2022-07-14 12:14:32 -06:00
jbd2
- The usual batches of cleanups from Baoquan He, Muchun Song, Miaohe
2022-08-05 16:32:45 -07:00
jffs2
This pull request contains fixes for JFFS2, UBI and UBIFS
2022-06-03 14:42:24 -07:00
jfs
Folio changes for 6.0
2022-08-03 10:35:43 -07:00
kernfs
kernfs: Implement kernfs_show()
2022-09-01 18:08:44 +02:00
ksmbd
ksmbd: don't remove dos attribute xattr on O_TRUNC open
2022-08-15 21:07:01 -05:00
lockd
lockd: detect and reject lock arguments that overflow
2022-08-04 10:28:48 -04:00
minix
fs: Convert block_read_full_page() to block_read_full_folio()
2022-05-09 16:21:44 -04:00
netfs
netfs: do not unlock and put the folio twice
2022-07-14 10:10:12 +02:00
nfs
NFS client updates for Linux 5.20
2022-08-10 14:04:32 -07:00
nfs_common
…
nfsd
NFSD 6.0 Release Notes
2022-08-09 14:56:49 -07:00
nilfs2
Folio changes for 6.0
2022-08-03 10:35:43 -07:00
nls
…
notify
fsnotify: Fix comment typo
2022-07-26 13:38:47 +02:00
ntfs
Folio changes for 6.0
2022-08-03 10:35:43 -07:00
ntfs3
ntfs3 for 6.0
2022-08-17 14:51:22 -07:00
ocfs2
fs.setgid.v6.0
2022-08-09 09:52:28 -07:00
omfs
fs: Convert block_read_full_page() to block_read_full_folio()
2022-05-09 16:21:44 -04:00
openpromfs
fs: allocate inode by using alloc_inode_sb()
2022-03-22 15:57:03 -07:00
orangefs
orangefs: Remove test for folio error
2022-06-29 08:51:07 -04:00
overlayfs
overlayfs update for 6.0
2022-08-08 11:03:11 -07:00
proc
take care to handle NULL ->proc_lseek()
2022-08-14 15:16:18 -04:00
pstore
EFI updates for v5.20
2022-08-03 14:38:02 -07:00
qnx4
fs: Convert block_read_full_page() to block_read_full_folio()
2022-05-09 16:21:44 -04:00
qnx6
fs: Convert mpage_readpage to mpage_read_folio
2022-05-09 16:21:44 -04:00
quota
- The usual batches of cleanups from Baoquan He, Muchun Song, Miaohe
2022-08-05 16:32:45 -07:00
ramfs
…
reiserfs
Folio changes for 6.0
2022-08-03 10:35:43 -07:00
romfs
romfs: Convert romfs to read_folio
2022-05-09 16:21:46 -04:00
smbfs_common
Add various fsctl structs
2022-05-23 20:24:12 -05:00
squashfs
Updates to various subsystems which I help look after. lib, ocfs2,
2022-08-07 10:03:24 -07:00
sysfs
kobject: kobj_type: remove default_attrs
2022-04-05 15:39:19 +02:00
sysv
Not a lot of material this cycle. Many singleton patches against various
2022-05-27 11:22:03 -07:00
tracefs
tracefs: Fix syntax errors in comments
2022-06-17 19:01:28 -04:00
ubifs
- The usual batches of cleanups from Baoquan He, Muchun Song, Miaohe
2022-08-05 16:32:45 -07:00
udf
fs/buffer: Combine two submit_bh() and ll_rw_block() arguments
2022-07-14 12:14:32 -06:00
ufs
Folio changes for 6.0
2022-08-03 10:35:43 -07:00
unicode
kbuild: unify cmd_copy and cmd_shipped
2022-02-14 10:37:32 +09:00
vboxsf
vboxsf: Convert vboxsf to read_folio
2022-05-09 16:21:46 -04:00
verity
fs-verity: mention btrfs support
2022-07-15 23:42:30 -07:00
xfs
New code for 6.0:
2022-08-13 13:50:11 -07:00
zonefs
New code for 6.0:
2022-08-11 13:11:49 -07:00
aio.c
iov_iter work, part 1 - isolated cleanups and optimizations.
2022-08-03 13:50:22 -07:00
anon_inodes.c
…
attr.c
vfs: Check the truncate maximum size in inode_newsize_ok()
2022-08-08 10:39:29 -07:00
bad_inode.c
…
binfmt_aout.c
…
binfmt_elf_fdpic.c
coredump: Snapshot the vmas in do_coredump
2022-03-08 12:55:29 -06:00
binfmt_elf_test.c
binfmt_elf: Introduce KUnit test
2022-03-03 20:38:56 -08:00
binfmt_elf.c
revert "fs/binfmt_elf: use PT_LOAD p_align values for static PIE"
2022-04-15 14:49:56 -07:00
binfmt_flat.c
binfmt_flat: Remove shared library support
2022-04-22 10:57:18 -07:00
binfmt_misc.c
Fix regression due to "fs: move binfmt_misc sysctl to its own file"
2022-02-09 09:50:02 -08:00
binfmt_script.c
…
buffer.c
Folio changes for 6.0
2022-08-03 10:35:43 -07:00
char_dev.c
…
compat_binfmt_elf.c
binfmt_elf: Introduce KUnit test
2022-03-03 20:38:56 -08:00
coredump.c
fs: do not compare against ->llseek
2022-07-16 09:19:15 -04:00
d_path.c
…
dax.c
- The usual batches of cleanups from Baoquan He, Muchun Song, Miaohe
2022-08-05 16:32:45 -07:00
dcache.c
dcache: move the DCACHE_OP_COMPARE case out of the __d_lookup_rcu loop
2022-08-17 14:33:03 -07:00
direct-io.c
iov_iter: advancing variants of iov_iter_get_pages{,_alloc}()
2022-08-08 22:37:22 -04:00
drop_caches.c
…
eventfd.c
…
eventpoll.c
epoll: autoremove wakers even more aggressively
2022-07-17 17:31:40 -07:00
exec.c
execve fix for v6.0-rc2
2022-08-19 14:02:24 -07:00
fcntl.c
keep iocb_flags() result cached in struct file
2022-06-10 16:10:23 -04:00
fhandle.c
…
file_table.c
iov_iter work, part 1 - isolated cleanups and optimizations.
2022-08-03 13:50:22 -07:00
file.c
fix the breakage in close_fd_get_file() calling conventions change
2022-06-05 15:03:03 -04:00
filesystems.c
…
fs_context.c
vfs: fs_context: fix up param length parsing in legacy_parse_param
2022-01-18 09:23:19 +02:00
fs_parser.c
fs_parse: allow parameter value to be empty
2021-12-09 14:09:36 -05:00
fs_pin.c
…
fs_struct.c
…
fs_types.c
…
fs-writeback.c
writeback: Fix inode->i_io_list not be protected by inode->i_lock error
2022-06-06 09:54:30 +02:00
fsopen.c
uninline may_mount() and don't opencode it in fspick(2)/fsopen(2)
2022-05-19 23:25:10 -04:00
init.c
…
inode.c
We have a good pile of various fixes and cleanups from Xiubo, Jeff,
2022-08-11 12:41:07 -07:00
internal.h
Cleanups (and one fix) around struct mount handling.
2022-06-04 19:00:05 -07:00
ioctl.c
Fixes for 5.18-rc1:
2022-04-01 19:35:56 -07:00
Kconfig
mm: hugetlb_vmemmap: introduce the name HVO
2022-08-08 18:06:42 -07:00
Kconfig.binfmt
m68knommu: changes for linux 5.19
2022-05-30 10:56:18 -07:00
kernel_read_file.c
fs/kernel_read_file: allow to read files up-to ssize_t
2022-06-16 19:58:21 -07:00
libfs.c
fs: Convert simple_readpage to simple_read_folio
2022-05-09 16:21:44 -04:00
locks.c
fs/lock: Rearrange ops in flock syscall.
2022-07-18 10:01:47 -04:00
Makefile
io_uring: move to separate directory
2022-07-24 18:39:10 -06:00
mbcache.c
- The usual batches of cleanups from Baoquan He, Muchun Song, Miaohe
2022-08-05 16:32:45 -07:00
mount.h
switch try_to_unlazy_next() to __legitimize_mnt()
2022-07-05 16:18:21 -04:00
mpage.c
Folio changes for 6.0
2022-08-03 10:35:43 -07:00
namei.c
fs.setgid.v6.0
2022-08-09 09:52:28 -07:00
namespace.c
switch try_to_unlazy_next() to __legitimize_mnt()
2022-07-05 16:18:21 -04:00
no-block.c
…
nsfs.c
…
open.c
iov_iter work, part 1 - isolated cleanups and optimizations.
2022-08-03 13:50:22 -07:00
pipe.c
Not a lot of material this cycle. Many singleton patches against various
2022-05-27 11:22:03 -07:00
pnode.c
…
pnode.h
…
posix_acl.c
acl: make posix_acl_clone() available to overlayfs
2022-07-15 22:09:57 +02:00
proc_namespace.c
vfs: escape hash as well
2022-06-28 13:58:05 -04:00
read_write.c
switch new_sync_{read,write}() to ITER_UBUF
2022-08-08 22:37:15 -04:00
readdir.c
…
remap_range.c
- The usual batches of cleanups from Baoquan He, Muchun Song, Miaohe
2022-08-05 16:32:45 -07:00
select.c
select: Fix indefinitely sleeping task in poll_schedule_timeout()
2022-01-11 09:03:05 -08:00
seq_file.c
rxrpc: Fix locking issue
2022-05-22 21:03:01 +01:00
signalfd.c
Merge branch 'signal-for-v5.17' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2022-01-17 05:49:30 +02:00
splice.c
iter_to_pipe(): switch to advancing variant of iov_iter_get_pages()
2022-08-08 22:37:23 -04:00
stack.c
…
stat.c
RISC-V Patches for the 5.19 Merge Window, Part 1
2022-05-31 14:10:54 -07:00
statfs.c
…
super.c
fuse update for 6.0
2022-08-08 11:10:02 -07:00
sync.c
riscv: compat: syscall: Add compat_sys_call_table implementation
2022-04-26 13:36:25 -07:00
sysctls.c
fs: move namespace sysctls and declare fs base directory
2022-01-22 08:33:36 +02:00
timerfd.c
…
userfaultfd.c
- The usual batches of cleanups from Baoquan He, Muchun Song, Miaohe
2022-08-05 16:32:45 -07:00
utimes.c
…
xattr.c
acl: move idmapped mount fixup into vfs_{g,s}etxattr()
2022-07-15 22:08:59 +02:00