On 2022/8/20 08:05, Tejun Heo wrote: > Hello, > > Currently, deactivated kernfs nodes are used for two purposes - during > removal to kill and drain nodes and during creation to make multiple > kernfs_nodes creations to succeed or fail as a group. > > This patchset make kernfs [de]activation generic so that it can be used > anytime to deactivate (hide and drain) and activate (show) kernfs nodes, > and, on top, implement cgroup_file_show() which allows toggling cgroup file > visiblity. > > This is for the following pending patchset to allow disabling PSI on > per-cgroup basis: > > https://lore.kernel.org/all/20220808110341.15799-1-zhouchengming@xxxxxxxxxxxxx/t/#u > > which requires hiding the corresponding cgroup interface files while > disabled. Hello, It's so nice of you for implementing this! I will rebase on your work to do per-cgroup PSI disable/re-enable and test it today. Thanks! > > This patchset contains the following seven patches. > > 0001-kernfs-Simply-by-replacing-kernfs_deref_open_node-wi.patch > 0002-kernfs-Drop-unnecessary-mutex-local-variable-initial.patch > 0003-kernfs-Refactor-kernfs_get_open_node.patch > 0004-kernfs-Skip-kernfs_drain_open_files-more-aggressivel.patch > 0005-kernfs-Make-kernfs_drain-skip-draining-more-aggressi.patch > 0006-kernfs-Allow-kernfs-nodes-to-be-deactivated-and-re-a.patch > 0007-cgroup-Implement-cgroup_file_show.patch > > 0001-0003 are misc prep patches. 0004-0006 implement kernsf_deactivate(). > 0008 implements cgroup_file_show() on top. The patches are also available in > the following git branch: > > git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc.git kernfs-deactivate > > diffstat follows. Thanks. > > fs/kernfs/dir.c | 120 +++++++++++++++++++++++++++++++++++++++++------------------- > fs/kernfs/file.c | 139 +++++++++++++++++++++++++++++++--------------------------------------- > fs/kernfs/kernfs-internal.h | 1 > include/linux/cgroup.h | 1 > include/linux/kernfs.h | 2 + > kernel/cgroup/cgroup.c | 23 +++++++++++ > 6 files changed, 172 insertions(+), 114 deletions(-) > > -- > tejun > >
