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Date: Tue, 30 Oct 2007 13:25:43 -0500
From: James Bottomley <James.Bottomley@...elEye.com>
To: Stefan Richter <stefanr@...6.in-berlin.de>
Cc: Kay Sievers <kay.sievers@...y.org>, Greg KH <greg@...ah.com>,
linux-scsi <linux-scsi@...r.kernel.org>,
linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] sysfs: add filter function to groups
On Mon, 2007-10-29 at 18:58 +0100, Stefan Richter wrote:
> James Bottomley wrote:
> >> > struct attribute_group {
> >> > const char *name;
> >> > + int (*filter_show)(struct kobject *, int);
>
> > Actually, it returns a true/false value indicating whether the given
> > attribute should be displayed.
>
> How about this:
>
> int (*is_visible)(...);
OK, so is this latest revision acceptable to everyone?
James
Index: BUILD-2.6/fs/sysfs/group.c
===================================================================
--- BUILD-2.6.orig/fs/sysfs/group.c 2007-10-28 17:27:04.000000000 -0500
+++ BUILD-2.6/fs/sysfs/group.c 2007-10-30 12:35:47.000000000 -0500
@@ -16,25 +16,31 @@
#include "sysfs.h"
-static void remove_files(struct sysfs_dirent *dir_sd,
+static void remove_files(struct sysfs_dirent *dir_sd, struct kobject *kobj,
const struct attribute_group *grp)
{
struct attribute *const* attr;
+ int i;
- for (attr = grp->attrs; *attr; attr++)
- sysfs_hash_and_remove(dir_sd, (*attr)->name);
+ for (i = 0, attr = grp->attrs; *attr; i++, attr++)
+ if (grp->is_visible &&
+ grp->is_visible(kobj, *attr, i))
+ sysfs_hash_and_remove(dir_sd, (*attr)->name);
}
-static int create_files(struct sysfs_dirent *dir_sd,
+static int create_files(struct sysfs_dirent *dir_sd, struct kobject *kobj,
const struct attribute_group *grp)
{
struct attribute *const* attr;
- int error = 0;
+ int error = 0, i;
- for (attr = grp->attrs; *attr && !error; attr++)
- error = sysfs_add_file(dir_sd, *attr, SYSFS_KOBJ_ATTR);
+ for (i = 0, attr = grp->attrs; *attr && !error; i++, attr++)
+ if (grp->is_visible &&
+ grp->is_visible(kobj, *attr, i))
+ error |=
+ sysfs_add_file(dir_sd, *attr, SYSFS_KOBJ_ATTR);
if (error)
- remove_files(dir_sd, grp);
+ remove_files(dir_sd, kobj, grp);
return error;
}
@@ -54,7 +60,7 @@ int sysfs_create_group(struct kobject *
} else
sd = kobj->sd;
sysfs_get(sd);
- error = create_files(sd, grp);
+ error = create_files(sd, kobj, grp);
if (error) {
if (grp->name)
sysfs_remove_subdir(sd);
@@ -75,7 +81,7 @@ void sysfs_remove_group(struct kobject *
} else
sd = sysfs_get(dir_sd);
- remove_files(sd, grp);
+ remove_files(sd, kobj, grp);
if (grp->name)
sysfs_remove_subdir(sd);
Index: BUILD-2.6/include/linux/sysfs.h
===================================================================
--- BUILD-2.6.orig/include/linux/sysfs.h 2007-10-28 17:20:06.000000000 -0500
+++ BUILD-2.6/include/linux/sysfs.h 2007-10-30 13:24:06.000000000 -0500
@@ -32,6 +32,8 @@ struct attribute {
struct attribute_group {
const char *name;
+ int (*is_visible)(struct kobject *,
+ struct attribute *, int);
struct attribute **attrs;
};
Index: BUILD-2.6/kernel/params.c
===================================================================
--- BUILD-2.6.orig/kernel/params.c 2007-10-29 01:18:43.000000000 -0500
+++ BUILD-2.6/kernel/params.c 2007-10-29 01:18:49.000000000 -0500
@@ -472,7 +472,7 @@ param_sysfs_setup(struct module_kobject
sizeof(mp->grp.attrs[0]));
size[1] = (valid_attrs + 1) * sizeof(mp->grp.attrs[0]);
- mp = kmalloc(size[0] + size[1], GFP_KERNEL);
+ mp = kzalloc(size[0] + size[1], GFP_KERNEL);
if (!mp)
return ERR_PTR(-ENOMEM);
-
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