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sysfs: added __compat_only_sysfs_link_entry_to_kobj()

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Added a new function __compat_only_sysfs_link_group_to_kobj() that adds
a symlink from attribute or group to a kobject. This needed for
maintaining backwards compatibility with PPI attributes in the TPM
driver.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Peter Huewe <peterhuewe@gmx.de>
This commit is contained in:
Jarkko Sakkinen 2015-04-22 19:36:06 +03:00 committed by Peter Huewe
parent 399235dc6e
commit 37c1c04cca
2 changed files with 55 additions and 0 deletions
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44
fs/sysfs/group.c
View File

@ -352,3 +352,47 @@ void sysfs_remove_link_from_group(struct kobject *kobj, const char *group_name,
}
}
EXPORT_SYMBOL_GPL(sysfs_remove_link_from_group);
/**
* __compat_only_sysfs_link_entry_to_kobj - add a symlink to a kobject pointing
* to a group or an attribute
* @kobj: The kobject containing the group.
* @target_kobj: The target kobject.
* @target_name: The name of the target group or attribute.
*/
int __compat_only_sysfs_link_entry_to_kobj(struct kobject *kobj,
struct kobject *target_kobj,
const char *target_name)
{
struct kernfs_node *target;
struct kernfs_node *entry;
struct kernfs_node *link;
/*
* We don't own @target_kobj and it may be removed at any time.
* Synchronize using sysfs_symlink_target_lock. See sysfs_remove_dir()
* for details.
*/
spin_lock(&sysfs_symlink_target_lock);
target = target_kobj->sd;
if (target)
kernfs_get(target);
spin_unlock(&sysfs_symlink_target_lock);
if (!target)
return -ENOENT;
entry = kernfs_find_and_get(target_kobj->sd, target_name);
if (!entry) {
kernfs_put(target);
return -ENOENT;
}
link = kernfs_create_link(kobj->sd, target_name, entry);
if (IS_ERR(link) && PTR_ERR(link) == -EEXIST)
sysfs_warn_dup(kobj->sd, target_name);
kernfs_put(entry);
kernfs_put(target);
return IS_ERR(link) ? PTR_ERR(link) : 0;
}
EXPORT_SYMBOL_GPL(__compat_only_sysfs_link_entry_to_kobj);

11
include/linux/sysfs.h
View File

@ -268,6 +268,9 @@ int sysfs_add_link_to_group(struct kobject *kobj, const char *group_name,
struct kobject *target, const char *link_name);
void sysfs_remove_link_from_group(struct kobject *kobj, const char *group_name,
const char *link_name);
int __compat_only_sysfs_link_entry_to_kobj(struct kobject *kobj,
struct kobject *target_kobj,
const char *target_name);
void sysfs_notify(struct kobject *kobj, const char *dir, const char *attr);
@ -451,6 +454,14 @@ static inline void sysfs_remove_link_from_group(struct kobject *kobj,
{
}
static inline int __compat_only_sysfs_link_entry_to_kobj(
struct kobject *kobj,
struct kobject *target_kobj,
const char *target_name)
{
return 0;
}
static inline void sysfs_notify(struct kobject *kobj, const char *dir,
const char *attr)
{