| Message ID | 16490618cbde91b5aac04873c39c8fb7666ff686.1719771133.git.lukas@wunner.de |
|---|---|
| State | New |
| Headers | show |
| Series | PCI device authentication | expand |
On Sun, 2024-06-30 at 21:48 +0200, Lukas Wunner wrote: > Commit dfa87c824a9a ("sysfs: allow attributes to be added to groups") > introduced dynamic addition of sysfs attributes to groups. > > Allow the same for bin_attributes, in support of a subsequent commit > which adds various bin_attributes every time a PCI device is > authenticated. > > Addition of bin_attributes to groups differs from regular attributes > in > that different kernfs_ops are selected by > sysfs_add_bin_file_mode_ns() > vis-à-vis sysfs_add_file_mode_ns(). > > So call either of those two functions from sysfs_add_file_to_group() > based on an additional boolean parameter and add two wrapper > functions, > one for bin_attributes and another for regular attributes. > > Removal of bin_attributes from groups does not require a > differentiation > for bin_attributes and can use the same code path as regular > attributes. > > Signed-off-by: Lukas Wunner <lukas@wunner.de> > Cc: Alan Stern <stern@rowland.harvard.edu> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Alistair > --- > fs/sysfs/file.c | 69 ++++++++++++++++++++++++++++++++++++----- > -- > include/linux/sysfs.h | 19 ++++++++++++ > 2 files changed, 78 insertions(+), 10 deletions(-) > > diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c > index d1995e2d6c94..9268232781b5 100644 > --- a/fs/sysfs/file.c > +++ b/fs/sysfs/file.c > @@ -383,14 +383,14 @@ int sysfs_create_files(struct kobject *kobj, > const struct attribute * const *ptr > } > EXPORT_SYMBOL_GPL(sysfs_create_files); > > -/** > - * sysfs_add_file_to_group - add an attribute file to a pre-existing > group. > - * @kobj: object we're acting for. > - * @attr: attribute descriptor. > - * @group: group name. > - */ > -int sysfs_add_file_to_group(struct kobject *kobj, > - const struct attribute *attr, const char *group) > +static const struct bin_attribute *to_bin_attr(const struct > attribute *attr) > +{ > + return container_of(attr, struct bin_attribute, attr); > +} > + > +static int __sysfs_add_file_to_group(struct kobject *kobj, > + const struct attribute *attr, > + const char *group, bool > is_bin_attr) > { > struct kernfs_node *parent; > kuid_t uid; > @@ -408,14 +408,49 @@ int sysfs_add_file_to_group(struct kobject > *kobj, > return -ENOENT; > > kobject_get_ownership(kobj, &uid, &gid); > - error = sysfs_add_file_mode_ns(parent, attr, attr->mode, > uid, gid, > - NULL); > + if (is_bin_attr) > + error = sysfs_add_bin_file_mode_ns(parent, > to_bin_attr(attr), > + attr->mode, uid, > gid, NULL); > + else > + error = sysfs_add_file_mode_ns(parent, attr, > + attr->mode, uid, gid, > NULL); > kernfs_put(parent); > > return error; > } > + > +/** > + * sysfs_add_file_to_group - add an attribute file to a pre-existing > group. > + * @kobj: object we're acting for. > + * @attr: attribute descriptor. > + * @group: group name. > + * > + * Returns 0 on success or error code on failure. > + */ > +int sysfs_add_file_to_group(struct kobject *kobj, > + const struct attribute *attr, > + const char *group) > +{ > + return __sysfs_add_file_to_group(kobj, attr, group, false); > +} > EXPORT_SYMBOL_GPL(sysfs_add_file_to_group); > > +/** > + * sysfs_add_bin_file_to_group - add bin_attribute file to pre- > existing group. > + * @kobj: object we're acting for. > + * @attr: attribute descriptor. > + * @group: group name. > + * > + * Returns 0 on success or error code on failure. > + */ > +int sysfs_add_bin_file_to_group(struct kobject *kobj, > + const struct bin_attribute *attr, > + const char *group) > +{ > + return __sysfs_add_file_to_group(kobj, &attr->attr, group, > true); > +} > +EXPORT_SYMBOL_GPL(sysfs_add_bin_file_to_group); > + > /** > * sysfs_chmod_file - update the modified mode value on an object > attribute. > * @kobj: object we're acting for. > @@ -565,6 +600,20 @@ void sysfs_remove_file_from_group(struct kobject > *kobj, > } > EXPORT_SYMBOL_GPL(sysfs_remove_file_from_group); > > +/** > + * sysfs_remove_bin_file_from_group - remove bin_attribute file from > group. > + * @kobj: object we're acting for. > + * @attr: attribute descriptor. > + * @group: group name. > + */ > +void sysfs_remove_bin_file_from_group(struct kobject *kobj, > + const struct bin_attribute > *attr, > + const char *group) > +{ > + sysfs_remove_file_from_group(kobj, &attr->attr, group); > +} > +EXPORT_SYMBOL_GPL(sysfs_remove_bin_file_from_group); > + > /** > * sysfs_create_bin_file - create binary file for object. > * @kobj: object. > diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h > index a7d725fbf739..aff1d81e8971 100644 > --- a/include/linux/sysfs.h > +++ b/include/linux/sysfs.h > @@ -451,6 +451,12 @@ int sysfs_add_file_to_group(struct kobject > *kobj, > const struct attribute *attr, const char > *group); > void sysfs_remove_file_from_group(struct kobject *kobj, > const struct attribute *attr, const char > *group); > +int sysfs_add_bin_file_to_group(struct kobject *kobj, > + const struct bin_attribute *attr, > + const char *group); > +void sysfs_remove_bin_file_from_group(struct kobject *kobj, > + const struct bin_attribute > *attr, > + const char *group); > int sysfs_merge_group(struct kobject *kobj, > const struct attribute_group *grp); > void sysfs_unmerge_group(struct kobject *kobj, > @@ -660,6 +666,19 @@ static inline void > sysfs_remove_file_from_group(struct kobject *kobj, > { > } > > +static inline int sysfs_add_bin_file_to_group(struct kobject *kobj, > + const struct > bin_attribute *attr, > + const char *group) > +{ > + return 0; > +} > + > +static inline void sysfs_remove_bin_file_from_group(struct kobject > *kobj, > + const struct > bin_attribute *attr, > + const char *group) > +{ > +} > + > static inline int sysfs_merge_group(struct kobject *kobj, > const struct attribute_group *grp) > {
On Sun, 30 Jun 2024 21:48:00 +0200 Lukas Wunner <lukas@wunner.de> wrote: > Commit dfa87c824a9a ("sysfs: allow attributes to be added to groups") > introduced dynamic addition of sysfs attributes to groups. > > Allow the same for bin_attributes, in support of a subsequent commit > which adds various bin_attributes every time a PCI device is > authenticated. > > Addition of bin_attributes to groups differs from regular attributes in > that different kernfs_ops are selected by sysfs_add_bin_file_mode_ns() > vis-à-vis sysfs_add_file_mode_ns(). > > So call either of those two functions from sysfs_add_file_to_group() > based on an additional boolean parameter and add two wrapper functions, > one for bin_attributes and another for regular attributes. > > Removal of bin_attributes from groups does not require a differentiation > for bin_attributes and can use the same code path as regular attributes. > > Signed-off-by: Lukas Wunner <lukas@wunner.de> > Cc: Alan Stern <stern@rowland.harvard.edu> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c index d1995e2d6c94..9268232781b5 100644 --- a/fs/sysfs/file.c +++ b/fs/sysfs/file.c @@ -383,14 +383,14 @@ int sysfs_create_files(struct kobject *kobj, const struct attribute * const *ptr } EXPORT_SYMBOL_GPL(sysfs_create_files); -/** - * sysfs_add_file_to_group - add an attribute file to a pre-existing group. - * @kobj: object we're acting for. - * @attr: attribute descriptor. - * @group: group name. - */ -int sysfs_add_file_to_group(struct kobject *kobj, - const struct attribute *attr, const char *group) +static const struct bin_attribute *to_bin_attr(const struct attribute *attr) +{ + return container_of(attr, struct bin_attribute, attr); +} + +static int __sysfs_add_file_to_group(struct kobject *kobj, + const struct attribute *attr, + const char *group, bool is_bin_attr) { struct kernfs_node *parent; kuid_t uid; @@ -408,14 +408,49 @@ int sysfs_add_file_to_group(struct kobject *kobj, return -ENOENT; kobject_get_ownership(kobj, &uid, &gid); - error = sysfs_add_file_mode_ns(parent, attr, attr->mode, uid, gid, - NULL); + if (is_bin_attr) + error = sysfs_add_bin_file_mode_ns(parent, to_bin_attr(attr), + attr->mode, uid, gid, NULL); + else + error = sysfs_add_file_mode_ns(parent, attr, + attr->mode, uid, gid, NULL); kernfs_put(parent); return error; } + +/** + * sysfs_add_file_to_group - add an attribute file to a pre-existing group. + * @kobj: object we're acting for. + * @attr: attribute descriptor. + * @group: group name. + * + * Returns 0 on success or error code on failure. + */ +int sysfs_add_file_to_group(struct kobject *kobj, + const struct attribute *attr, + const char *group) +{ + return __sysfs_add_file_to_group(kobj, attr, group, false); +} EXPORT_SYMBOL_GPL(sysfs_add_file_to_group); +/** + * sysfs_add_bin_file_to_group - add bin_attribute file to pre-existing group. + * @kobj: object we're acting for. + * @attr: attribute descriptor. + * @group: group name. + * + * Returns 0 on success or error code on failure. + */ +int sysfs_add_bin_file_to_group(struct kobject *kobj, + const struct bin_attribute *attr, + const char *group) +{ + return __sysfs_add_file_to_group(kobj, &attr->attr, group, true); +} +EXPORT_SYMBOL_GPL(sysfs_add_bin_file_to_group); + /** * sysfs_chmod_file - update the modified mode value on an object attribute. * @kobj: object we're acting for. @@ -565,6 +600,20 @@ void sysfs_remove_file_from_group(struct kobject *kobj, } EXPORT_SYMBOL_GPL(sysfs_remove_file_from_group); +/** + * sysfs_remove_bin_file_from_group - remove bin_attribute file from group. + * @kobj: object we're acting for. + * @attr: attribute descriptor. + * @group: group name. + */ +void sysfs_remove_bin_file_from_group(struct kobject *kobj, + const struct bin_attribute *attr, + const char *group) +{ + sysfs_remove_file_from_group(kobj, &attr->attr, group); +} +EXPORT_SYMBOL_GPL(sysfs_remove_bin_file_from_group); + /** * sysfs_create_bin_file - create binary file for object. * @kobj: object. diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h index a7d725fbf739..aff1d81e8971 100644 --- a/include/linux/sysfs.h +++ b/include/linux/sysfs.h @@ -451,6 +451,12 @@ int sysfs_add_file_to_group(struct kobject *kobj, const struct attribute *attr, const char *group); void sysfs_remove_file_from_group(struct kobject *kobj, const struct attribute *attr, const char *group); +int sysfs_add_bin_file_to_group(struct kobject *kobj, + const struct bin_attribute *attr, + const char *group); +void sysfs_remove_bin_file_from_group(struct kobject *kobj, + const struct bin_attribute *attr, + const char *group); int sysfs_merge_group(struct kobject *kobj, const struct attribute_group *grp); void sysfs_unmerge_group(struct kobject *kobj, @@ -660,6 +666,19 @@ static inline void sysfs_remove_file_from_group(struct kobject *kobj, { } +static inline int sysfs_add_bin_file_to_group(struct kobject *kobj, + const struct bin_attribute *attr, + const char *group) +{ + return 0; +} + +static inline void sysfs_remove_bin_file_from_group(struct kobject *kobj, + const struct bin_attribute *attr, + const char *group) +{ +} + static inline int sysfs_merge_group(struct kobject *kobj, const struct attribute_group *grp) {
Commit dfa87c824a9a ("sysfs: allow attributes to be added to groups") introduced dynamic addition of sysfs attributes to groups. Allow the same for bin_attributes, in support of a subsequent commit which adds various bin_attributes every time a PCI device is authenticated. Addition of bin_attributes to groups differs from regular attributes in that different kernfs_ops are selected by sysfs_add_bin_file_mode_ns() vis-à-vis sysfs_add_file_mode_ns(). So call either of those two functions from sysfs_add_file_to_group() based on an additional boolean parameter and add two wrapper functions, one for bin_attributes and another for regular attributes. Removal of bin_attributes from groups does not require a differentiation for bin_attributes and can use the same code path as regular attributes. Signed-off-by: Lukas Wunner <lukas@wunner.de> Cc: Alan Stern <stern@rowland.harvard.edu> --- fs/sysfs/file.c | 69 ++++++++++++++++++++++++++++++++++++------- include/linux/sysfs.h | 19 ++++++++++++ 2 files changed, 78 insertions(+), 10 deletions(-)