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authorEric W. Biederman <ebiederm@xmission.com>2010-03-30 22:31:28 +0400
committerGreg Kroah-Hartman <gregkh@suse.de>2010-05-21 20:37:31 +0400
commit746edb7ae8a1abdd39be2b28c03aa073183340db (patch)
tree6e2bbfd8f42c11c95a4f63623a96317eb00efe77 /fs/sysfs/symlink.c
parentaf10ec77b43335ab4e473e4087d85979caf02d65 (diff)
downloadlinux-746edb7ae8a1abdd39be2b28c03aa073183340db.tar.xz
sysfs: Implement sysfs_delete_link
When removing a symlink sysfs_remove_link does not provide enough information to figure out which tagged directory the symlink falls in. So I need sysfs_delete_link which is passed the target of the symlink to delete. sysfs_rename_link is updated to call sysfs_delete_link instead of sysfs_remove_link as we have all of the information necessary and the callers are interesting. Both of these functions now have enough information to find a symlink in a tagged directory. The only restriction is that they must be called before the target kobject is renamed or deleted. If they are called later I loose track of which tag the target kobject was marked with and can no longer find the old symlink to remove it. This patch was split from an earlier patch. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: Benjamin Thery <benjamin.thery@bull.net> Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com> Acked-by: Tejun Heo <tj@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'fs/sysfs/symlink.c')
-rw-r--r--fs/sysfs/symlink.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/fs/sysfs/symlink.c b/fs/sysfs/symlink.c
index b6ebdaa00f37..f71246bebfe4 100644
--- a/fs/sysfs/symlink.c
+++ b/fs/sysfs/symlink.c
@@ -109,6 +109,26 @@ int sysfs_create_link_nowarn(struct kobject *kobj, struct kobject *target,
}
/**
+ * sysfs_delete_link - remove symlink in object's directory.
+ * @kobj: object we're acting for.
+ * @targ: object we're pointing to.
+ * @name: name of the symlink to remove.
+ *
+ * Unlike sysfs_remove_link sysfs_delete_link has enough information
+ * to successfully delete symlinks in tagged directories.
+ */
+void sysfs_delete_link(struct kobject *kobj, struct kobject *targ,
+ const char *name)
+{
+ const void *ns = NULL;
+ spin_lock(&sysfs_assoc_lock);
+ if (targ->sd)
+ ns = targ->sd->s_ns;
+ spin_unlock(&sysfs_assoc_lock);
+ sysfs_hash_and_remove(kobj->sd, ns, name);
+}
+
+/**
* sysfs_remove_link - remove symlink in object's directory.
* @kobj: object we're acting for.
* @name: name of the symlink to remove.