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sysfs: Support is_visible() on binary attributes 

According to the sysfs header file:

    "The returned value will replace static permissions defined in
     struct attribute or struct bin_attribute."

but this isn't the case, as is_visible is only called on struct attribute
only. This patch introduces a new is_bin_visible() function to implement
the same functionality for binary attributes, and updates documentation
accordingly.

Note that to keep functionality and code similar to that of normal
attributes, the mode is now checked as well to ensure it contains only
read/write permissions or SYSFS_PREALLOC.

Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Emilio López <emilio.lopez@collabora.co.uk>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Olof Johansson <olof@lixom.net>
This commit is contained in:
Emilio López 2015-09-21 10:38:20 -03:00 committed by Olof Johansson
parent f14ae099bd
commit 7f5028cf61
2 changed files with 29 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
fs/sysfs/group.c
View File

@ -73,13 +73,26 @@ static int create_files(struct kernfs_node *parent, struct kobject *kobj,
}
if (grp->bin_attrs) {
for (bin_attr = grp->bin_attrs; *bin_attr; bin_attr++) {
for (i = 0, bin_attr = grp->bin_attrs; *bin_attr; i++, bin_attr++) {
umode_t mode = (*bin_attr)->attr.mode;
if (update)
kernfs_remove_by_name(parent,
(*bin_attr)->attr.name);
if (grp->is_bin_visible) {
mode = grp->is_bin_visible(kobj, *bin_attr, i);
if (!mode)
continue;
}
WARN(mode & ~(SYSFS_PREALLOC | 0664),
"Attribute %s: Invalid permissions 0%o\n",
(*bin_attr)->attr.name, mode);
mode &= SYSFS_PREALLOC | 0664;
error = sysfs_add_file_mode_ns(parent,
&(*bin_attr)->attr, true,
(*bin_attr)->attr.mode, NULL);
mode, NULL);
if (error)
break;
}

18
include/linux/sysfs.h
View File

@ -64,10 +64,18 @@ do { \
* a new subdirectory with this name.
* @is_visible: Optional: Function to return permissions associated with an
* attribute of the group. Will be called repeatedly for each
* attribute in the group. Only read/write permissions as well as
* SYSFS_PREALLOC are accepted. Must return 0 if an attribute is
* not visible. The returned value will replace static permissions
* defined in struct attribute or struct bin_attribute.
* non-binary attribute in the group. Only read/write
* permissions as well as SYSFS_PREALLOC are accepted. Must
* return 0 if an attribute is not visible. The returned value
* will replace static permissions defined in struct attribute.
* @is_bin_visible:
* Optional: Function to return permissions associated with a
* binary attribute of the group. Will be called repeatedly
* for each binary attribute in the group. Only read/write
* permissions as well as SYSFS_PREALLOC are accepted. Must
* return 0 if a binary attribute is not visible. The returned
* value will replace static permissions defined in
* struct bin_attribute.
* @attrs: Pointer to NULL terminated list of attributes.
* @bin_attrs: Pointer to NULL terminated list of binary attributes.
* Either attrs or bin_attrs or both must be provided.
@ -76,6 +84,8 @@ struct attribute_group {
const char *name;
umode_t (*is_visible)(struct kobject *,
struct attribute *, int);
umode_t (*is_bin_visible)(struct kobject *,
struct bin_attribute *, int);
struct attribute **attrs;
struct bin_attribute **bin_attrs;
};