Re: [Linux-cluster] Re: GFS, what's remaining

[Daniel Phillips <phillips@istop.com>]

On Sunday 04 September 2005 01:00, Joel Becker wrote:
> On Sun, Sep 04, 2005 at 12:51:10AM -0400, Daniel Phillips wrote:
> > Clearly, I ought to have asked why dlmfs can't be done by configfs.  It
> > is the same paradigm: drive the kernel logic from user-initiated vfs
> > methods.  You already have nearly all the right methods in nearly all the
> > right places.
>
>  configfs, like sysfs, does not support ->open() or ->release()
> callbacks.

struct configfs_item_operations {
 void (*release)(struct config_item *);
 ssize_t (*show)(struct config_item *, struct attribute *,char *);
 ssize_t (*store)(struct config_item *,struct attribute *,const char *, size_t);
 int (*allow_link)(struct config_item *src, struct config_item *target);
 int (*drop_link)(struct config_item *src, struct config_item *target);
};

struct configfs_group_operations {
 struct config_item *(*make_item)(struct config_group *group, const char *name);
 struct config_group *(*make_group)(struct config_group *group, const char *name);
 int (*commit_item)(struct config_item *item);
 void (*drop_item)(struct config_group *group, struct config_item *item);
};

You do have ->release and ->make_item/group.

If I may hand you a more substantive argument: you don't support user-driven
creation of files in configfs, only directories.  Dlmfs supports user-created
files.  But you know, there isn't actually a good reason not to support
user-created files in configfs, as dlmfs demonstrates.

Anyway, goodnight.

Regards,

Daniel