On Thu, Aug 19, 2021 at 10:46 PM Jeff Layton <jlayton@xxxxxxxxxx> wrote:
>
> On Thu, 2021-08-19 at 11:37 +0530, Venky Shankar wrote:
> > Callers can use this helper to create a subdirectory under
> > "ceph" directory in debugfs to place custom files for exporting
> > information to userspace.
> >
> > Signed-off-by: Venky Shankar <vshankar@xxxxxxxxxx>
> > ---
> > include/linux/ceph/debugfs.h | 3 +++
> > net/ceph/debugfs.c | 27 +++++++++++++++++++++++++--
> > 2 files changed, 28 insertions(+), 2 deletions(-)
> >
> > diff --git a/include/linux/ceph/debugfs.h b/include/linux/ceph/debugfs.h
> > index 8b3a1a7a953a..c372e6cb8aae 100644
> > --- a/include/linux/ceph/debugfs.h
> > +++ b/include/linux/ceph/debugfs.h
> > @@ -10,5 +10,8 @@ extern void ceph_debugfs_cleanup(void);
> > extern void ceph_debugfs_client_init(struct ceph_client *client);
> > extern void ceph_debugfs_client_cleanup(struct ceph_client *client);
> >
> > +extern struct dentry *ceph_debugfs_create_subdir(const char *subdir);
> > +extern void ceph_debugfs_cleanup_subdir(struct dentry *subdir_dentry);
> > +
> > #endif
> >
> > diff --git a/net/ceph/debugfs.c b/net/ceph/debugfs.c
> > index 2110439f8a24..cd6f69dd97fa 100644
> > --- a/net/ceph/debugfs.c
> > +++ b/net/ceph/debugfs.c
> > @@ -404,6 +404,18 @@ void ceph_debugfs_cleanup(void)
> > debugfs_remove(ceph_debugfs_dir);
> > }
> >
> > +struct dentry *ceph_debugfs_create_subdir(const char *subdir)
> > +{
> > + return debugfs_create_dir(subdir, ceph_debugfs_dir);
> > +}
> > +EXPORT_SYMBOL(ceph_debugfs_create_subdir);
> > +
> > +void ceph_debugfs_cleanup_subdir(struct dentry *subdir_dentry)
> > +{
> > + debugfs_remove(subdir_dentry);
> > +}
> > +EXPORT_SYMBOL(ceph_debugfs_cleanup_subdir);
> > +
>
> Rather than these specialized helpers, I think it'd be cleaner/more
> evident to just export the ceph_debugfs_dir symbol and then use normal
> debugfs commands in ceph.ko.
I had initially thought of doing that, but was concerned about putting
ceph_debugfs_dir to abuse once exported.
>
> > void ceph_debugfs_client_init(struct ceph_client *client)
> > {
> > char name[80];
> > @@ -413,7 +425,7 @@ void ceph_debugfs_client_init(struct ceph_client *client)
> >
> > dout("ceph_debugfs_client_init %p %s\n", client, name);
> >
> > - client->debugfs_dir = debugfs_create_dir(name, ceph_debugfs_dir);
> > + client->debugfs_dir = ceph_debugfs_create_subdir(name);
> >
> > client->monc.debugfs_file = debugfs_create_file("monc",
> > 0400,
> > @@ -454,7 +466,7 @@ void ceph_debugfs_client_cleanup(struct ceph_client *client)
> > debugfs_remove(client->debugfs_monmap);
> > debugfs_remove(client->osdc.debugfs_file);
> > debugfs_remove(client->monc.debugfs_file);
> > - debugfs_remove(client->debugfs_dir);
> > + ceph_debugfs_cleanup_subdir(client->debugfs_dir);
> > }
> >
> > #else /* CONFIG_DEBUG_FS */
> > @@ -475,4 +487,15 @@ void ceph_debugfs_client_cleanup(struct ceph_client *client)
> > {
> > }
> >
> > +struct dentry *ceph_debugfs_create_subdir(const char *subdir)
> > +{
> > + return NULL;
> > +}
> > +EXPORT_SYMBOL(ceph_debugfs_create_subdir);
> > +
> > +void ceph_debugfs_cleanup_subdir(struct dentry *subdir_dentry)
> > +{
> > +}
> > +EXPORT_SYMBOL(ceph_debugfs_cleanup_subdir);
> > +
> > #endif /* CONFIG_DEBUG_FS */
>
> --
> Jeff Layton <jlayton@xxxxxxxxxx>
>
--
Cheers,
Venky
