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[SCSI] sysfs: add filter function to groups

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This patch allows the various users of attribute_groups to selectively
allow the appearance of group attributes.  The primary consumer of
this will be the transport classes in which we currently have
elaborate attribute selection algorithms to do this same thing.

Acked-by: Greg KH <greg@kroah.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
James Bottomley 2007-10-31 09:38:04 -05:00
parent d52b3815a5
commit d4acd722b7
3 changed files with 19 additions and 11 deletions
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26
fs/sysfs/group.c
View File

@ -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 * kobj,
} 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 * kobj,
} else
sd = sysfs_get(dir_sd);
remove_files(sd, grp);
remove_files(sd, kobj, grp);
if (grp->name)
sysfs_remove_subdir(sd);

2
include/linux/sysfs.h
View File

@ -32,6 +32,8 @@ struct attribute {
struct attribute_group {
const char *name;
int (*is_visible)(struct kobject *,
struct attribute *, int);
struct attribute **attrs;
};

2
kernel/params.c
View File

@ -472,7 +472,7 @@ param_sysfs_setup(struct module_kobject *mk,
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);