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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
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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
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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
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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
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devpts
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dlm fs: dlm: move kref_put assert for lkb structs 2022-08-01 09:31:46 -05:00
ecryptfs
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efivarfs efi: vars: Move efivar caching layer into efivarfs 2022-06-24 20:40:19 +02:00
efs
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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
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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
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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
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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
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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
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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
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openpromfs
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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
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qnx6
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quota - The usual batches of cleanups from Baoquan He, Muchun Song, Miaohe 2022-08-05 16:32:45 -07:00
ramfs
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reiserfs Folio changes for 6.0 2022-08-03 10:35:43 -07:00
romfs
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smbfs_common
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squashfs Updates to various subsystems which I help look after. lib, ocfs2, 2022-08-07 10:03:24 -07:00
sysfs
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sysv
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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
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vboxsf
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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
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
Makefile io_uring: move to separate directory 2022-07-24 18:39:10 -06:00
aio.c iov_iter work, part 1 - isolated cleanups and optimizations. 2022-08-03 13:50:22 -07:00
anon_inodes.c
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attr.c vfs: Check the truncate maximum size in inode_newsize_ok() 2022-08-08 10:39:29 -07:00
bad_inode.c
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binfmt_aout.c
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binfmt_elf.c
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binfmt_elf_fdpic.c
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binfmt_elf_test.c
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binfmt_flat.c
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binfmt_misc.c
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binfmt_script.c
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buffer.c Folio changes for 6.0 2022-08-03 10:35:43 -07:00
char_dev.c
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compat_binfmt_elf.c
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coredump.c fs: do not compare against ->llseek 2022-07-16 09:19:15 -04:00
d_path.c
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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
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eventfd.c
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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
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file.c fix the breakage in close_fd_get_file() calling conventions change 2022-06-05 15:03:03 -04:00
file_table.c iov_iter work, part 1 - isolated cleanups and optimizations. 2022-08-03 13:50:22 -07:00
filesystems.c
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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
fs_context.c
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fs_parser.c
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fs_pin.c
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fs_struct.c
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fs_types.c
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fsopen.c
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init.c
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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
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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
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locks.c fs/lock: Rearrange ops in flock syscall. 2022-07-18 10:01:47 -04:00
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
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nsfs.c
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open.c iov_iter work, part 1 - isolated cleanups and optimizations. 2022-08-03 13:50:22 -07:00
pipe.c
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pnode.c
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pnode.h
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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
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remap_range.c - The usual batches of cleanups from Baoquan He, Muchun Song, Miaohe 2022-08-05 16:32:45 -07:00
select.c
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seq_file.c
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signalfd.c
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splice.c iter_to_pipe(): switch to advancing variant of iov_iter_get_pages() 2022-08-08 22:37:23 -04:00
stack.c
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stat.c RISC-V Patches for the 5.19 Merge Window, Part 1 2022-05-31 14:10:54 -07:00
statfs.c
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super.c fuse update for 6.0 2022-08-08 11:10:02 -07:00
sync.c
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sysctls.c
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timerfd.c
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userfaultfd.c - The usual batches of cleanups from Baoquan He, Muchun Song, Miaohe 2022-08-05 16:32:45 -07:00
utimes.c
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xattr.c acl: move idmapped mount fixup into vfs_{g,s}etxattr() 2022-07-15 22:08:59 +02:00