Re: [PATCH 15/19] kernfs: split ->kill_sb

[Michal Koutný]

On Wed, Sep 13, 2023 at 08:10:09AM -0300, Christoph Hellwig <hch@xxxxxx> wrote:
> Split the kernfs_kill_sb helper into helpers for the new split
> shutdown_sb and free_sb methods.  Note that resctrl has very odd
> locking in ->kill_sb, so this commit only releases the locking
> acquired in rdt_shutdown_sb in rdt_free_sb.  This is not very good
> code and relies on ->shutdown_sb and ->free_sb to always be called
> in pairs, which it currently is.  The next commit will try to clean
> this up.
> 
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>
> ---
>  arch/x86/kernel/cpu/resctrl/rdtgroup.c | 12 +++++++++---
>  fs/kernfs/mount.c                      | 18 ++++++++----------
>  fs/sysfs/mount.c                       |  7 ++++---
>  include/linux/kernfs.h                 |  5 ++---
>  kernel/cgroup/cgroup.c                 | 10 ++++++----
>  5 files changed, 29 insertions(+), 23 deletions(-)

Reviewed-by: Michal Koutný <mkoutny@xxxxxxxx>

(Also, I didn't find a necessity to have kernfs_free_sb(sb) under
rdtgroup_mutex, so folding the following patch of the series may be fine
too.)

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